Terms used in this standard and explanations

APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated December 30, 1985 No. 272

Concrete and reinforced concrete pipes. Types and basic parameters

In return

GOST 22000 86 concrete and reinforced concrete pipes. Types and basic parameters. Terms used in this standard and explanations

APPENDIX (reference). TERMS USED IN THIS STANDARD AND EXPLANATIONS

Types and main parameters

In return
GOST 22000-76

APPLICATION

TERMS USED IN THIS STANDARD AND EXPLANATIONS

GOST 22000-86

tns

GOST 22000-86

Group Zh33

STATE STANDARD OF THE USSR UNION

CONCRETE AND REINFORCED CONCRETE PIPES

Types and main parameters

Concrete and reinforced concrete pipes. Types and basic parameters

Date of introduction 1986-07-01

By Decree of the USSR State Committee for Construction Affairs dated December 30, 1985 N 272, the implementation period was set from 07/01/1986.

INSTEAD GOST 22000-76

REISSUE. November 1989

1. This standard applies to prefabricated concrete and reinforced concrete pipes manufactured different ways and intended for laying underground non-pressure and pressure pipelines transporting liquids.

The standard establishes the types, main dimensions and parameters of pipes that should be provided for in new and revised existing standards, technical conditions And project documentation for specific types of pipes.

The standard does not apply to culverts, laid under embankments of automobile and railways, and drainage pipes.

The terms used in the standard and their explanations are given in the reference appendix.

2. Depending on the design operating mode of the transported liquid in the pipeline, pipes are divided into non-pressure and pressure.

2.1. Gravity pipes are divided into the following types:


	Cylindrical sockets with a round hole and butt joints sealed with sealants or other materials;
	The same with the sole;
	Cylindrical socket type with a round hole, with a stepped joint surface of the sleeve end of the pipe and butt joints sealed with rubber rings;
	The same with the sole;
	Cylindrical socket type with a round hole, with a thrust collar on the butt surface of the sleeve end of the pipe and butt joints sealed with rubber rings;
	The same with the sole;
	With a sole, seam, with a round hole and butt joints sealed with sealants or other materials;
	The same, with the ovoid opening;
	The same with an elliptical hole.

2.2. Pressure pipes are divided into the following types:


	Cylindrical socket type with a round hole and butt joints sealed using rubber rings;
	The same, with a polymer core;
	Same with steel core.

2.3. Symbols for types of concrete pipes (as opposed to reinforced concrete) are supplemented with a capital letter “B” before the letter “T”.

3. The nominal diameter and useful length of pipes with a round hole must correspond to those indicated in Table 1.

Table 1


Pipe type	Pipe size	Conventional diameter pipe passage, mm	Useful length pipes, mm
Concrete gravity pipes










BTS and BTSP


	BTS60.25; BTSP60.25
	BTS80.25; BTSP80.25
	BTS100.25;BTSP100.25
Reinforced concrete non-pressure pipes
	T40.50, TB40.50
	T50.50, TB50.50
	T60.50, TB60.50
	T80.50, TB80.50
	T100.50,TB100.50
	T120.50,TB120.50
	T140.50,TB140.50
	T160.50,TB160.50
	TP100.50, TBP100.50
	TP120.50, TBP120.50
	TP140.50, TBP140.50
	TP160.50, TBP160.50










	TS100.35, TSP100.35
	TS-100.50, TSP100.50
	TS120.35, TSP120.35
	TS120.50, TSP120.50
	TS140.35, TSP140.35
	TS140.50, TSP140.50
	TS160.35, TSP160.35
	TS160.50, TSP160.50
	TPF100.50
	TFP120.50
	TFP140.50

	TFP200.45
	TFP240.30
Concrete pressure pipes






Reinforced concrete pressure pipes
















Reinforced concrete pressure pipes with a polymer core
	TNP40.50
	TNP50.50

	TNP80.50
	TNP100.50

Reinforced concrete pressure pipes with steel core

Notes:

1. It is allowed to accept pipes of all types of greater useful length than indicated in Table 1. At the same time, their length for pipes with a nominal diameter of up to 1600 mm inclusive is assigned as a multiple of 500 mm, for pipes with a diameter of more than 1600 mm - as a multiple of 250 mm.

2. With an appropriate feasibility study, it is allowed to accept:

pipes with nominal diameters of 1800 and 2200 mm, as well as more than 2400 mm for specific conditions of pipeline construction;

internal diameter of pipes, different from the nominal diameter of the pipe indicated in Table 1, up to plus 6% - for pipes with diameters up to 600 mm inclusive and up to plus 3% - for pipes with diameters more than 600 mm.

3. It is allowed, until January 1, 1990, to accept the internal diameter of pressure pipes with a steel core that differs from the nominal diameter indicated in Table 1, up to minus 7% - for pipes with a diameter of 250 mm and up to minus 2% - for pipes with a diameter of 300 mm or more.

3.1. The useful length of reinforced concrete free-flow pipes of types TS and TSP, equal to 2500-3500 mm, should be accepted only for pipes intended to be manufactured using a technology that allows complete immediate removal of formwork.

3.2. Reinforced concrete pressure pipes of the TN type are provided with non-prestressed or prestressed reinforcement. Prestressed pipes must have a useful length of at least 5000 mm.

3.3. The dimensions of the joint surfaces of pipes connected on rubber O-rings must ensure:

the size of the annular gap, taking into account the permissible deviations in the diameters of the working part of the joint within the limits (as a percentage of the cross-sectional diameter of the rubber ring):

60-75 - for non-pressure pipes,

50-70 - for low-pressure pipes (item 5),

40-65 - for medium and high-pressure pipes;

the angle of rotation of the pipeline in the butt joint of the pipes is at least 1°30";

elongation of the rubber ring under tension by 8-15%;

the length of the working part of the joint, sealed with a rubber ring by the rolling method, is not less than 3.5 times the cross-sectional diameter of the ring.

3.4. The dimensions of rubber O-rings in an unstretched state must correspond to those indicated in Table 2.

table 2


Pipe diameter	Dimensions of rubber rings for pipe joints sealed using the
	rolling		slip
	Inner diameter rings	Ring section diameter	Ring inner diameter	Ring section diameter

Note. Until 01/01/90, it is allowed to use rubber rings with dimensions different from those indicated in Table 2, satisfying the requirements of clause 3.3.

4. Gravity pipes are divided into three groups according to bearing capacity:

It is allowed to accept reinforced concrete free-flow pipes of greater load-bearing capacity for specific conditions of pipeline construction.

4.1. The strength characteristics of free-flow pipes must ensure their operation at the design backfill height (clause 4) under average conditions, which correspond to:

base under the pipe - flat ground for cylindrical pipes with a nominal diameter of up to 500 mm inclusive and pipes with a base of all diameters, or profiled soil with a coverage angle of 90° for cylindrical pipes with a nominal diameter of more than 500 mm;

backfilling - with soil with a density of 1.8 t/m with normal compaction for cylindrical pipes with a diameter of up to 800 mm inclusive and pipes with a base of all diameters or increased compaction for cylindrical pipes with a diameter of more than 800 mm;

temporary load on the ground surface A8 and NG-60.

5. Pressure pipes, depending on the value of the calculated internal pressure in the pipeline, are divided into groups and classes indicated in Table 3

Table 3

5.1. Depending on their design, pressure pipes should be of the following classes:

N1 and N3 - type BTN and type TN with non-prestressed reinforcement;

H3 and H5 - TNP type;

N5-N20 - type TN with prestressed reinforcement;

N10-N20 - TNS type.

5.2. The strength characteristics of pressure pipes must ensure their operation with the calculated internal pressures for the corresponding class at a backfill height above the pipe of 2 m under average installation conditions, which correspond to:

the base under the pipe is profiled soil with a coverage angle of 90°;

backfilling with soil with a density of 1.8 t/m with normal compaction;

temporary load on the surface of the earth NG-60.

5.3. Under conditions for laying pressure pipes that ensure a reduction in external loads on the pipeline, by agreement of the consumer with the manufacturer and the design organization - the author of the pipeline project, it is allowed to use pipes of classes H1 and H3 at an internal pressure exceeding the design values for each class of pipes by 0. 1 MPa (1 kgf/cm), and pipes of classes H5, H10, H15 and H20 at an internal pressure exceeding the calculated values for each class of pipe by 0.3 MPa (3 kgf/cm).

6. Corrosion resistance pipes intended for use in aggressive environments should be ensured by using corrosion-resistant materials, meeting design requirements and technological methods(primary protection), and also, if necessary, by protecting pipe surfaces (secondary protection) in accordance with the requirements of SNiP 2.03.11-85.

7. Steel embedded products designed to protect the pipeline from electrocorrosion caused by stray currents, the following should be provided:

in all reinforced concrete prestressed pressure pipes, regardless of the conditions of their use;

in other reinforced concrete non-pressure and pressure pipes - at the request of the customer in accordance with the project for protecting the pipeline from electrical corrosion.

8. Pipes should be marked with grades in accordance with the requirements of GOST 23009-78.

The pipe grade consists of alphanumeric groups separated by hyphens.

The first group contains the designation of the pipe type and its nominal diameter in centimeters and useful length in decimeters.

In the second group indicate:

a group based on the load-bearing capacity of free-flow pipes or a class of pressure pipes, designated by Arabic numerals;

designation of the class of prestressed reinforcement (if necessary);

the use of a pressure pipe at increased internal pressure (clause 5.3), indicated by the lowercase letter “y”.

The third group, if necessary, includes additional characteristics pipes:

availability of embedded products for protection reinforced concrete pipes from electrocorrosion, denoted by the lowercase letter “k”;

characteristics of pipes that ensure their durability when operating in an aggressive environment, for example, indicators of concrete permeability, denoted in capital letters: “N” - normal, “P” - reduced and “O” - especially low permeability;

design features of pipes caused by their manufacturing technology.

Example symbol(brand) concrete gravity pipe BTS type, nominal diameter 300 mm, useful length 2000 mm, second group in load-bearing capacity:

BTS30.20-2

The same, reinforced concrete free-flow pipe type TBP, with a nominal diameter of 1000 mm, a useful length of 5000 mm, of the second group in terms of load-bearing capacity, having embedded products for protection against electrocorrosion:

TVP100.50-2-k

The same, reinforced concrete prestressed pressure pipe type TN, nominal diameter 1200 mm, useful length 5000 mm, class H10, intended for pipelines with an internal pressure of 1.3 MPa (13 kgf/cm):

TN120.50-10u

APPLICATION

Information

TERMS USED IN THIS STANDARD AND EXPLANATIONS

Gravity pipes- pipes intended for the construction of pipelines through which liquids are transported by gravity, with an incomplete cross-section (up to 0.95 of the internal diameter of the pipe).

Pressure pipes- pipes intended for the construction of pipelines through which liquids are transported under pressure.

Bell pipes- pipes that have a socket at one end and a sleeve part at the other end that fits into the socket during pipeline installation.

Seam pipes- pipes having mutually mating surfaces at the ends within the limits of the pipe wall thickness.

Pipes with sole- pipes having a flat or other shaped bottom in the working position.

Core pipes- pipes in the wall of which there is a waterproof, usually thin-walled metal or other material core.

Dnominal pipe diameter- geometric parameter cross section pipe, equal to the diameter of the conditional circular passage (without taking into account permissible deviations), along which the hydraulic calculation of the pipeline is carried out.

Useful pipe length- pipe length actually taken into account when installing pipelines.

Joint surfaces- surfaces of the end sections of pipes, mutually mating during pipeline installation.

Design internal pressure- the highest possible pressure in the pipeline under operating conditions without taking into account its increase during a water hammer or with an increase in pressure during a water hammer (taking into account the action of shock-proof fittings), if it high blood pressure in combination with other loads will have a greater impact on the pipeline.

Normal soil compaction- compaction of the backfill soil to a height of at least 200 mm above the pipe by layer-by-layer (no more than 200 mm) requirements, ensuring soil compaction with a coefficient of at least 0.85 (equal to the ratio of the design density of the soil skeleton to its maximum density obtained by methods specified by GOST 22733 -77 *).
________________
* In the territory Russian Federation the document is not valid. GOST 22733-2002 is in force. - Database manufacturer's note.

Increased soil compaction- compaction of the backfill soil to a height of at least 200 mm above the pipe by compaction, ensuring soil compaction with a coefficient of at least 0.93.

Electronic document text

prepared by Kodeks JSC and verified against:
official publication
M.: Standards Publishing House, 1990

State standard of the USSR GOST 22000-86

"CONCRETE AND REINFORCED CONCRETE PIPES. TYPES AND MAIN PARAMETERS"

Concrete and reinforced concrete pipes Types and basic parameters

Instead of GOST 22000-76

1. This standard applies to prefabricated concrete and reinforced concrete pipes manufactured in various ways and intended for laying underground free-flow and pressure pipelines transporting liquids.

The standard establishes the types, main dimensions and parameters of pipes that should be included in new and revised existing standards, technical specifications and design documentation for specific types of pipes.

The standard does not apply to culverts laid under embankments of roads and railways, and drainage pipes.

The terms used in the standard and their explanations are given in the reference appendix.

2. Depending on the design operating mode of the transported liquid in the pipeline, pipes are divided into non-pressure and pressure.

2.1. Gravity pipes are divided into the following types:

T - cylindrical bell-shaped with a round hole and butt joints sealed with sealants or other materials;

TP - the same, with a sole;

TS - cylindrical bell-shaped with a round hole, with a stepped butt surface of the sleeve end of the pipe and butt joints sealed with rubber rings;

TSP - the same, with a sole;

TB - cylindrical bell-shaped with a round hole, with a thrust collar on the butt surface of the sleeve end of the pipe and butt joints sealed with rubber rings:

TBP - the same, with a sole;

TFP - with a sole, seam, with a round hole and butt joints sealed with sealants or other materials;

TO - the same, with an ovoid opening;

TE - the same, with an elliptical hole.

2.2. Pressure pipes are divided into the following types:

TN - cylindrical socket type with a round hole and butt joints sealed using rubber rings;

TNP - the same, with a polymer core;

TNS - the same, with a steel core.

2.3. Symbols for types of concrete pipes (as opposed to reinforced concrete) are supplemented with a capital letter “B” before the letter “T”.

3. The nominal diameter and useful length of pipes with a round hole must correspond to those indicated in Table 1.

Table 1

Pipe type	Pipe size	Pipe diameter, mm	Useful pipe length, mm
Concrete gravity pipes










BTS and BTSP


	BTS60.25; BTSP60.25
	BTS80.25; BTSP80.25
	BTS100.25;BTSP100.25
Reinforced concrete non-pressure pipes
	T40.50, TB40.50
	T50.50, TB50.50
	T60.50, TB60.50
	T80.50, TB80.50
	T100.50, TB100.50
	T120.50, TB120.50
	T140.50, TB140.50
	T160.50, TB160.50
	TP100.50, TBP100.50
	TP120.50, TBP120.50
	TP140.50, TBP140.50
	TP160.50, TBP160.50










	TS100.35, TSP100.35
	TS-100.50, TSP100.50
	TS120.35, TSP120.35
	TS120.50, TSP120.50
	TS140.35, TSP140.35
	TS140.50, TSP140.50
	TS160.35, TSP160.35
	TS160.50, TSP160.50






Concrete pressure pipes






Reinforced concrete pressure pipes
















Reinforced concrete pressure pipes with a polymer core






Reinforced concrete pressure pipes with steel core

Notes:

2. With an appropriate feasibility study, it is allowed to accept:

pipes with nominal diameters of 1800 x 2200 mm, as well as more than 2400 mm for specific conditions of pipeline construction;

3. It is allowed, until January 1, 1990, to accept the internal diameter of pressure pipes with a steel core that differs from the nominal diameter indicated in Table 1, up to minus 7% for pipes with a diameter of 250 mm and up to minus 2% for pipes with a diameter of 300 mm and more.

3.1. The useful length of reinforced concrete free-flow pipes of types TS and TSP, equal to 2500 - 3500 mm, should be accepted only for pipes intended to be manufactured using a technology that allows complete immediate stripping.

3.2. Reinforced concrete pressure pipes of the TN type are provided with non-prestressed or prestressed reinforcement. Prestressed pipes must have a useful length of at least 5000 mm.

3.3. The dimensions of the joint surfaces of pipes connected on rubber O-rings must ensure:

60 - 75 - for non-pressure pipes,

50 - 70 - for low-pressure pipes (item 5),

40 - 65 - for medium and high-pressure pipes;

the angle of rotation of the pipeline in the butt joint of the pipes is at least 1°30";

elongation of the rubber ring under tension by 8 - 15%;

the length of the working part of the joint, sealed with a rubber ring by the rolling method, is not less than 3.5 times the cross-sectional diameter of the ring.

3.4. The dimensions of rubber O-rings in an unstretched state must correspond to those indicated in Table 2.

4. Gravity pipes are divided into three groups according to their load-bearing capacity:

the first - with an estimated height of backfilling with soil of 2 m;

second " " " " " 4 m;

third " " " " " 6 m.

It is allowed to accept reinforced concrete free-flow pipes of greater load-bearing capacity for specific conditions of pipeline construction.

4.1. The strength characteristics of free-flow pipes must ensure their operation at the design backfill height (clause 4) under average conditions, which correspond to:

table 2

	Dimensions of rubber rings for pipe joints sealed using the
conditional passage			slip
	Ring inner diameter	Ring section diameter	Ring inner diameter	Ring section diameter

Note. It is allowed until January 1, 1990 to use rubber rings of sizes different from those indicated in Table 2, meeting the requirements of clause 3.3.

backfilling - with soil with a density of 1.8 t/m3 with normal compaction for cylindrical pipes with nominal diameters up to 800 mm inclusive and pipes with a base of all diameters or increased compaction for cylindrical pipes with nominal diameters of more than 800 mm;

temporary load on the ground surface A8 and NG-60.

5. Depending on the value of the calculated internal pressure in the pipeline, pressure pipes are divided into groups and classes indicated in Table 3.

Table 3

5.1. Depending on their design, pressure pipes should be of the following classes:

H1 and N3 - type BTN and type TN with non-prestressed reinforcement;

H3 and H5 - TNP type;

N5-N20 - type TN with prestressed reinforcement;

N10-N20 - TNS type.

the base under the pipe is profiled soil with a coverage angle of 90°;

backfilling with soil with a density of 1.8 t/m3 with normal compaction;

5.3. Under conditions for laying pressure pipes that ensure a reduction in external loads on the pipeline, by agreement of the consumer with the manufacturer and the design organization - the author of the pipeline project, it is allowed to use pipes of classes H1 and H3 at an internal pressure exceeding the design values for each class of pipes by 0. 1 MPa (1 kgf/cm2), and pipes of classes H5, H10, H15 and H20 at internal pressure exceeding the calculated values for each class of pipe by 0.3 MPa (3 kgf/cm2).

6. Corrosion resistance of pipes intended for operation in an aggressive environment should be ensured by using corrosion-resistant materials, fulfilling design requirements and technological methods (primary protection), and also, if necessary, by protecting pipe surfaces (secondary protection) in accordance with the requirements of SNiP 2.03. 11-85.

7. Steel embedded products intended to protect the pipeline from electrocorrosion caused by stray currents should be provided with:

in all reinforced concrete prestressed pressure pipes, regardless of the conditions of their use;

in other reinforced concrete non-pressure and pressure pipes - at the request of the customer in accordance with the project for protecting the pipeline from electrical corrosion.

8. Pipes should be marked with grades in accordance with the requirements of GOST 23009-78.

The pipe grade consists of alphanumeric groups separated by hyphens.

The first group contains the designation of the pipe type and its nominal diameter in centimeters and useful length in decimeters.

In the second group indicate:

a group based on the load-bearing capacity of free-flow pipes or a class of pressure pipes, designated by Arabic numerals;

designation of the class of prestressed reinforcement (if necessary);

the use of a pressure pipe at increased internal pressure (clause 5.3), indicated by the lowercase letter “y”.

The third group, if necessary, includes additional characteristics of pipes:

the presence of embedded products to protect reinforced concrete pipes from electrocorrosion, indicated by the lowercase letter “k”;

design features of pipes caused by their manufacturing technology.

An example of a symbol (brand) of a concrete free-flow pipe of the BTS type, with a nominal diameter of 300 mm, a useful length of 2000 mm, of the second group in terms of bearing capacity:

TBP100.50-2-k

The same, reinforced concrete prestressed pressure pipe type TN, nominal diameter 1200 mm, useful length 5000 mm, class H10, intended for pipelines with an internal pressure of 1.3 MPa (13 kgf/cm2):

Application

Information

Gravity pipes are pipes intended for the construction of pipelines through which liquids are transported by gravity with an incomplete cross-section (up to 0.95 of the internal diameter of the pipe).

Pressure pipes are pipes designed for the construction of pipelines through which liquids are transported under pressure.

Bell-shaped pipes are pipes that have a socket at one end and a sleeve part at the other end, which fits into the socket when installing the pipeline.

Seam pipes are pipes that have mutually mating surfaces at their ends within the limits of the pipe wall thickness.

Pipes with a sole are pipes that have a flat or other shaped sole in the working position at the bottom.

Pipes with a core are pipes in the wall of which there is a waterproof, usually thin-walled metal or other material core.

The nominal diameter of the pipe is a geometric parameter of the cross-section of the pipe, equal to the diameter of the conventional circular passage (without taking into account permissible deviations), along which the hydraulic calculation of the pipeline is carried out.

Useful pipe length is the pipe length actually taken into account when installing pipelines.

Joint surfaces are the surfaces of the end sections of pipes that are mutually mating during the installation of pipelines.

Design internal pressure is the highest possible pressure in the pipeline under operating conditions without taking into account its increase during a water hammer or with an increase in pressure during a water hammer (taking into account the action of shock-proof fittings), if its increased pressure in combination with other loads will have a greater impact on the pipeline.

Normal soil compaction - compaction of the backfill soil to a height of at least 200 mm above the pipe by layer-by-layer (no more than 200 mm) requirements, ensuring soil compaction with a Coupl coefficient of at least 0.85 (Couple is equal to the ratio of the design density of the soil skeleton to its maximum density obtained methods specified by GOST 22733-77).

Increased soil compaction - compaction of the backfill soil to a height of at least 200 mm above the pipe by compaction, ensuring soil compaction with a Coupl coefficient of at least 0.93.

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CONCRETE PIPES
AND REINFORCED CONCRETE

TYPES AND MAIN PARAMETERS

STATE COMMITTEE OF THE USSR
ON CONSTRUCTION AFFAIRS

DEVELOPED by the Ministry of Industry building materials USSR

Research Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

State Design Institute "Soyuzvodkanalproekt" of the USSR State Construction Committee

All-Union Scientific Research Institute of Water Supply, Sewerage, Hydraulic Structures and Engineering Hydrogeology (VNII VODGEO) of the USSR State Construction Committee

Main Architectural and Planning Department of Moscow

Ministry of Construction, Road and Municipal Engineering

PERFORMERS

O. I. Krikunov, Ph.D. tech. sciences; V. I. Melikhov, Ph.D. tech. sciences (topic leaders); Yu. A. Kuprikov; E. G. Frolov, Ph.D. tech. sciences; K. A. Mavrin, Ph.D. tech. sciences; I. Yu. Kocherygina; A. L. Tsionsky, Ph.D. tech. sciences; V. S. Shirokov, Ph.D. tech. sciences; L. P. Khlyupin; N. L. Rips; V. I. Gotovtsev, Ph.D. tech. sciences; Yu. M. Samokhvalov; N.K. Kozeeva; L. P. Fomicheva; V. P. Ponomarev; N. I. Berger; A. I. Dolgushin, V. I. Denshchikov

INTRODUCED by the USSR Ministry of Construction Materials Industry

Deputy Minister I.V. Assovsky

APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated December 30, 1985 No. 272

STATE STANDARD OF THE USSR UNION

CONCRETE AND REINFORCED CONCRETE PIPES

Concrete and reinforced concrete pipes.
Types and basic parameters

GOST
22000-86

By Decree of the USSR State Committee for Construction Affairs dated December 30, 1985 No. 272, the introduction date was established

The standard does not apply to culverts laid under embankments of roads and railways, and drainage pipes.

The terms used in the standard and their explanations are given in the reference appendix.

2. Depending on the design operating mode of the transported liquid in the pipeline, pipes are divided into non-pressure and pressure.

2.1. Gravity pipes are divided into the following types:

T - cylindrical bell-shaped with a round hole and butt joints sealed with sealants or other materials;

TP - the same, with a sole;

TS - cylindrical bell-shaped with a round hole, with a stepped butt surface of the sleeve end of the pipe and butt joints sealed with rubber rings;

TSP - the same, with a sole;

TB - cylindrical bell-shaped with a round hole, with a thrust collar on the butt surface of the sleeve end of the pipe and butt joints sealed with rubber rings;

TBP - the same, with a sole;

TFP - with a sole, seam, with a round hole and butt joints sealed with sealants or other materials;

TO - the same, with an ovoid opening;

TE - the same, with an elliptical hole.

2.2. Pressure pipes are divided into the following types:

TN - cylindrical socket type with a round hole and butt joints sealed using rubber rings;

TNP - the same, with a polymer core;

TNS - the same, with a steel core.

2.3. Symbols for types of concrete pipes (as opposed to reinforced concrete) are supplemented with a capital letter “B” before the letter “T”.

3. The nominal diameter and useful length of pipes with a round hole must correspond to those indicated in the table. 1.

Table 1

Pipe type		Pipe size	Pipe diameter, mm	Useful pipe length, mm
Concrete gravity pipes




BTS and BTSP
		BTS60.25;
		BTSP60.25
		BTS80.25;
Reinforced concrete non-pressure pipes
	BTSP80.25 BTS100.25; BTSP100.25 T40.50, TB40.50 T50.50, TB50.50 T60.50, TB60.50 T80.50, TB80.50 T100.50, TB100.50
	T120.50, TB120.50 T140.50, TB140.50 T160.50, TB160.50 TP100.50, TBP100.50






	TP120.50, TBP120.50 TP140.50, TBP140.50
	TP160.50, TBP160.50 TS100.35, TSP100.35
	TS100.50, TSP100.50 TS120.35, TSP120.35
	TS120.50, TSP120.50 TS140.35, TSP140.35



Concrete pressure pipes



Reinforced concrete pressure pipes







TS140.50, TSP140.50

TS160.35, TSP160.35

Notes:

TS160.50, TSP160.50

Reinforced concrete pressure pipes with a polymer core

Reinforced concrete pressure pipes with steel core

1. It is allowed to accept pipes of all types greater than the useful length indicated in the table. 1. In this case, their length for pipes with a nominal diameter of up to 1600 mm inclusive is assigned as a multiple of 500 mm, for pipes with a nominal diameter of up to 1600 mm inclusive, and as a multiple of 250 mm for pipes over 1600 mm.

2. With an appropriate feasibility study, it is allowed to accept:

pipes with nominal diameters of 1600 and 2200 mm, as well as more than 2400 mm for specific conditions of pipeline construction;

the internal diameter of the pipes, different from the nominal diameter of the pipe indicated in the table. 1, up to plus 6% - for pipes with diameters up to 600 mm inclusive and up to plus 3% - for pipes with diameters over 600 mm.

3. It is allowed, until January 1, 1990, to accept the internal diameter of pressure pipes with a steel core that is different from the diameter of the nominal diameter indicated in the table. 1, up to minus 7% for pipes with a diameter of 250 mm and up to minus 2% for pipes with a diameter of 300 mm and more.

60-75 - for non-pressure pipes,

50-70 - for low-pressure pipes (item 5),

40-65 - for medium and high-pressure pipes;

the angle of rotation of the pipeline in the butt joint of the pipes is at least 1° 30¢;

elongation of the rubber ring under tension by 8-15%;

the length of the working part of the joint, sealed with a rubber ring by the rolling method, is not less than 3.5 times the cross-sectional diameter of the ring.

3.4. The dimensions of rubber O-rings in an unstretched state must correspond to those indicated in the table. 2.

table 2

Pipe diameter	Dimensions of rubber rings for pipe joints sealed using the
			slip
	Ring inner diameter	Ring section diameter	Ring inner diameter	Ring section diameter

Note. It is allowed until January 1, 1990 to use rubber rings with dimensions different from those indicated in the table. 2, satisfying the requirements of clause 3.3.

4. Gravity pipes are divided into three groups according to their load-bearing capacity:

the first - with an estimated height of backfilling with soil of 2 m;

second » » » » » 4 m;

third » » » » » 6 m.

It is allowed to accept reinforced concrete free-flow pipes of greater load-bearing capacity for specific conditions of pipeline construction.

4.1. The strength characteristics of free-flow pipes must ensure their operation at the design backfill height (clause 4) under average conditions, which correspond to:

backfilling - with soil with a density of 1.8 t/m 3 with normal compaction for cylindrical pipes with nominal diameters up to 800 mm inclusive and pipes with a base of all diameters or increased compaction for cylindrical pipes with nominal diameters of more than 800 mm;

temporary load on the ground surface A8 and NG-60.

5. Pressure pipes, depending on the value of the calculated internal pressure in the pipeline, are divided into groups and classes indicated in table. 3.

Table 3

5.1. Depending on their design, pressure pipes should be of the following classes:

N3 and N5 - type BTN and type TN with non-prestressed reinforcement;

H3 and H5 - TNP type;

N5 - N20 - type TN with prestressed reinforcement;

H10 - H20 - TNS type.

the base under the pipe is profiled soil with a coverage angle of 90°;

backfilling with soil with a density of 1.8 t/m 3 with normal compaction;

5.3. Under conditions for laying pressure pipes that ensure a reduction in external loads on the pipeline, by agreement of the consumer with the manufacturer and the design organization that authored the pipeline project, it is allowed to use pipes of classes H1 and H3 at an internal pressure exceeding the design values for each class of pipes by 0. 1 MPa (1 kgf/cm2), and pipes of classes H5, H10, H15 and H20 at an internal pressure exceeding the calculated values for each class of pipe by 0.3 MPa (3 kgf/cm2).

7. Steel embedded products intended to protect the pipeline from electrocorrosion caused by stray currents should be provided with:

in all reinforced concrete prestressed pressure pipes, regardless of the conditions of their use;

in other reinforced concrete non-pressure and pressure pipes - at the request of the customer in accordance with the project for protecting the pipeline from electrical corrosion.

8. Pipes should be marked with grades in accordance with the requirements of GOST 23009-78.

The pipe grade consists of alphanumeric groups separated by hyphens.

The first group contains the designation of the pipe type and its nominal diameter in centimeters and useful length in decimeters.

In the second group indicate:

a group based on the load-bearing capacity of free-flow pipes or a class of pressure pipes, designated by Arabic numerals;

designation of the class of prestressed reinforcement (if necessary);

the use of a pressure pipe at increased internal pressure (clause 5.3), indicated by the lowercase letter “y”.

The third group, if necessary, includes additional characteristics of pipes:

the presence of embedded products to protect reinforced concrete pipes from electrocorrosion, indicated by the lowercase letter “k”;

characteristics of pipes that ensure their durability when operating in an aggressive environment, for example, concrete permeability indicators, denoted in capital letters: “N” - normal, “P” - reduced and “O” - especially low permeability;

design features of pipes caused by their manufacturing technology.

An example of a symbol (brand) of a concrete free-flow pipe of the BTS type, with a nominal diameter of 300 mm, a useful length of 2000 mm, of the second group in terms of load-bearing capacity:

BTS30.20-2

TBP100.50-2-k

The same, reinforced concrete prestressed pressure pipe type TN, nominal diameter 1200 mm, useful length 5000 mm, class H10, intended for pipelines with an internal pressure of 1.3 MPa (13 kgf/cm2):

TN120.50-10u

Information

Gravity pipes- pipes intended for the construction of pipelines through which liquids are transported by gravity with an incomplete cross-section (up to 0.95 of the internal diameter of the pipe).

Pressure pipes- pipes intended for the construction of pipelines through which liquids are transported under pressure.

Bell pipes- pipes that have a socket at one end and a sleeve part at the other end that fits into the socket during pipeline installation.

Seam pipes- pipes having mutually mating surfaces at the ends within the limits of the pipe wall thickness.

Pipes with sole- pipes having a flat or other shaped bottom in the working position.

Core pipes- pipes in the wall of which there is a waterproof, usually thin-walled metal or other material core.

Pipe diameter- geometric parameter of the cross-section of the pipe, equal to the diameter of the conditional circular passage (without taking into account permissible deviations), along which the hydraulic calculation of the pipeline is carried out.

Useful pipe length- pipe length actually taken into account when installing pipelines.

Joint surfaces- surfaces of the end sections of pipes, mutually mating during pipeline installation.

Design internal pressure- the highest possible pressure in the pipeline under operating conditions without taking into account its increase during a water hammer or with an increase in pressure during a water hammer (taking into account the action of shock-proof fittings), if its increased pressure in combination with other loads will have a greater impact on the pipeline.

Increased soil compaction- compaction of the backfill soil to a height of at least 200 mm above the pipe by compaction, ensuring soil compaction with a coefficient To upl not less than 0.93.

Price 5 kopecks.

STATE STANDARD

USSR UNION

TYPES AND MAIN PARAMETERS

Official publication

USSR STATE COMMITTEE FOR CONSTRUCTION

DEVELOPED by the USSR Ministry of Construction Materials Industry

Scientific Research Institute of Concrete and Reinforced Concrete (NIIZh5] of the USSR State Construction Committee

State Design Institute "Soyuzvodkanalproekt" of the USSR State Construction Committee

All-Union Scientific Research Institute of Water Supply, Sewerage, Hydraulic Structures and Engineering Hydrogeology (VNII VODGEO) of the USSR State Construction Committee; Main Architectural and Planning Department of Moscow; Ministry of Construction, Road and Municipal Engineering

PERFORMERS

O I. Krikunov, Ph.D. tech. sciences; V. I. Melikhov, Ph.D. tech. sciences (topic leaders); Yu. A. Kuprchkov; E. G. Frolov, Ph.D. technical sciences; K. A. Mavrin, Candidate of Technical Sciences; I. Yu. Kocherygina, A. L. Tsionsky, Ph.D. tech. sciences; V. S. Shirokov, Ph.D. tech. sciences; L, P. Khlyupin; N L. Rine; V. I. G. Otovtsev, MD Tech. sciences; Yu. M. Samokhvalov; I. K. Kozeeva; L. P. Fomicheva; V. P. Ponomarev; N. I. Berger; A. I. Dop-gushn, V. I. Deishchikov

INTRODUCED by the USSR Ministry of Construction Materials Industry

Deputy Minister I.V. Dosovsky

APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Construction Affairs dated December 30, 1985, No. 272

UDC 621.643.255.002.5:006.354 ZhZZ Group

STATE STANDARD OF THE USSR UNION

CONCRETE AND REINFORCED CONCRETE PIPES

Types and main parameters

Concrete and reinforced concrete pipes. Types and basic parameters

GOST 22000-76

By Decree of the USSR State Committee for Construction Affairs dated December 30, 1985 No. 272, the introduction date was established

Failure to comply with the standard is punishable by law

L This standard applies to prefabricated concrete and reinforced concrete pipes manufactured in various ways and intended for laying underground gravity and pressure pipelines transporting liquids.

The standard does not apply to culverts laid under embankments of roads and railways, and drainage pipes.

The terms used in the standard and their explanations are given

in the help app.

2. Depending on the design operating mode of the transported liquid in the pipeline, pipes are divided into non-pressure and pressure.

2.1. Non-pressure pipes are divided into the following types: T - cylindrical socket pipes with a round hole and butt joints sealed with sealants or other materials;

TP - the same, with a sole;

TC-cylindrical bell-type with a round hole, with a stepped joint surface of the sleeve end of the pipe and butt joints sealed with rubber rings;

TSP - the same, with a sole;

Official publication Reproduction prohibited

(B) Standards Publishing House, 1986

TB - cylindrical bell-shaped with a round hole, with a thrust collar on the butt surface of the sleeve end of the pipe and butt joints sealed with rubber rings;

TBP - the same, with a sole;

TFP-with sole, seam, with a round hole and butt joints sealed with sealants or other materials;

TO - the same, with an ovoid opening;

TZ - the same, with an elliptical hole.

2.2. Pressure pipes are divided into the following types:

TN - cylindrical socket type with a round hole and butt joints sealed with rubber rings;

consumer goods - the same, with a polymer core;

TNS - the same, with a steel core.

2.3. Symbols for types of concrete pipes (as opposed to reinforced concrete) are supplemented with a capital letter “B” before the letter “T”.

3. The nominal diameter and useful length of pipes with a round hole must correspond to those indicated in the table. 1.

Table 1

Pipe type	Pipe size	Useful pipe length, mm
	Concrete gravity pipes













	BTS60.25; BTSP60.25
	BTS80.25; BTSP80.25
	BTS100.25; BTSP100.25

Continuation of Table 1

Pipe type	Standard size rough	Pipe diameter, mm	Useful pipe length, mm
Reinforced concrete non-pressure pipes
	T40 50, TB40 50
	T50 50, TB50 50
	T60 50, TB60 50
	T80 50, TB80 50
	T100 50, TB100 50
	T120 50, TB 120 50
	T140 50, TB 140 50
	T160 50, TB 160 50
	TP100 50, TBP100 50
	TP120 50, TBP120 50
	TP140 50, TBP140 50
	TP 160 50, TBP 160 50










	TS 100 35, TSP100 35
	TS-100 50, TSP100 50
	TS 120 35, TSP 120 35
	TS 120 50, TSP120 50
	TS 140 35, TSP140 35
	TS 140 50, TSP140 50
	TS 160 35 TSP 160 35
	TS 160 50, TSP 160 50

Concrete pressure pipes

BTN | BTN10 10 j 100 | 1000

Continuation of the table. /

Pipe type	Pipe size	Pipe diameter, mm	Useful pipe length, mm





Reinforced concrete pressure pipes
















Reinforced concrete pressure pipes with a polymer core

Reinforced concrete pressure pipes with steel core

Notes:

I. It is allowed to accept pipes of all types of greater useful length than indicated in the table. 1. Moreover, their length for pipes with a nominal diameter

passages up to 1600 mm inclusive are assigned a multiple of 500 mm, more than 1600 mm - a multiple of 250 mm.

2. With an appropriate feasibility study, it is allowed to accept:

pipes with nominal diameters of 1®00 and 2200 mm, as well as more than 2400 mm for specific conditions of pipeline construction;

3.1. The useful length of reinforced concrete free-flow pipes of types TS and TSP, equal to 2500 - 3500 mm, should be accepted only for pipes intended to be manufactured using a technology that allows complete immediate stripping.

3.2. Reinforced concrete pressure pipes of the TN type are provided with non-prestressed or prestressed reinforcement. Prestressed pipes must have a useful length of at least 5000 mm.

3.3. The dimensions of the joint surfaces of pipes connected on rubber O-rings must ensure;

60 - 75 - for non-pressure pipes,

50-70 - for low-pressure pipes (item 5),

40-65 - for medium and high-pressure pipes; the angle of rotation of the pipeline in the butt joint of the pipes is at least 1°30";

elongation of the rubber ring under tension by 8-15%; the length of the working part of the joint, sealed with a rubber ring by the rolling method, is not less than 3.5 times the cross-sectional diameter of the ring.

3.4. The dimensions of rubber O-rings in an unstretched state must correspond to those indicated in the table. 2.

4. Gravity pipes are divided into three groups according to their load-bearing capacity:

the first - with an estimated height of backfilling with soil of 2 m; second » » » » » 4 m;

third » » » » » 6 m.

It is allowed to accept reinforced concrete free-flow pipes of greater load-bearing capacity for specific conditions of pipeline construction.

4.1. The strength characteristics of free-flow pipes must ensure their operation at the design backfill height (clause 4) under average conditions, which correspond to:

table 2

	Dimensions of rubber rings for pipe joints sealed way
conditional		slip
conditional	Interior	Interior

Note: It is allowed until January 1, 1990 to use rubber rings with dimensions different from those indicated in the table. 2, meeting the requirements of clause 3.3.

backfilling - with soil with a density of 1.8 t/m 3 with normal compaction for cylindrical pipes with nominal diameters up to 800 mm inclusive and pipes with a base of all diameters or increased compaction for cylindrical pipes with nominal diameters of more than 800 mm;

temporary load on the ground surface A8 and NG-60.

5. Pressure pipes, depending on the value of the calculated internal pressure in the pipeline, are divided into groups and classes indicated in table. 3.

Table 3

5.1. Depending on their design, pressure pipes should be of the following classes:

N1 and NZ - type BTN and type TN with non-prestressed reinforcement;

NZ and N5 - TNP type;

N5 - N20 - type TN with prestressed reinforcement;

NU-N20-type TNS.

the base under the pipe is profiled soil with a coverage angle of 90°;

backfilling with soil with a density of 1.8 t/m 3 with normal compaction;

5.3. Under conditions for laying pressure pipes that ensure a reduction in external loads on the pipeline, by agreement of the consumer with the manufacturer and the design organization - the author of the pipeline project, it is allowed to use pipes of classes H1 and NZ at an internal pressure exceeding the design values for each class of pipes by 0. 1 MPa (1 kgf/cm2), and pipes of classes H5, NJu, N15 and H20 at an internal pressure exceeding the calculated values for each class of pipe by 0.3 MPa (3 kgf/cm2).

7. Steel embedded products intended to protect the pipeline from electrocorrosion caused by stray currents should be provided with:

in all reinforced concrete prestressed pressure pipes, regardless of the conditions of their use;

in other reinforced concrete non-pressure and pressure pipes - at the request of the customer in accordance with the project for protecting the pipeline from electrical corrosion.

8. Pipes should be marked with grades in accordance with the requirements of GOST 23009-78.

The pipe grade consists of alphanumeric groups separated by hyphens.

The first group contains the designation of the pipe type and its nominal diameter in centimeters and useful length in decimeters.

In the second group indicate:

a group based on the load-bearing capacity of free-flow pipes or a class of pressure pipes, designated by Arabic numerals;

designation of the class of prestressed reinforcement (if necessary);

the use of a pressure pipe at increased internal pressure (clause 5.3), indicated by the lowercase letter “y”.

The third group, if necessary, includes additional characteristics of pipes:

the presence of embedded products to protect reinforced concrete pipes from electrocorrosion, indicated by the lowercase letter “k”;

design features of pipes caused by their manufacturing technology.

An example of a symbol (brand) of a concrete free-flow pipe of the BTS type, with a nominal diameter of 300 mm, a useful length of 2000 mm, of the second group in terms of load-bearing capacity:

TBP100.50-2-k

The same, reinforced concrete prestressed pressure pipe type TN, nominal diameter 1200 mm, useful length 5000 mm, class H10, intended for pipelines with an internal pressure of 1.3 MPa (13 kgf/cm2):

APPLICATION

Information

THE TERMS USED IN THIS STANDARD

AND EXPLANATIONS

Gravity pipes are pipes intended for the construction of pipelines through which liquids are transported by gravity with an incomplete cross-section (up to 0.95 of the internal diameter of the pipe).

Pressure pipes are pipes intended for the construction of pipelines through which liquids are transported under pressure.

Bell-shaped pipes are pipes that have a socket at one end and a sleeve part at the other end, which fits into the socket when installing the pipeline.

Seam pipes are pipes that have mutually mating surfaces at their ends within the limits of the pipe wall thickness.

Pipes with a sole are pipes that have a flat or other shaped sole in the working position at the bottom.

Pipes with a core are pipes in the wall of which there is a waterproof, usually thin-walled metal or other material core.

Useful pipe length is the pipe length actually taken into account when installing pipelines.

Joint surfaces are the surfaces of the end sections of pipes that are mutually mating during the installation of pipelines.

Normal soil compaction - compaction of the backfill soil to a height of at least 200 mm above the pipe by layer-by-layer (no more than 200 mm) requirements, ensuring soil compaction with a coefficient /Supl of at least 0.85 (K uP l is equal to the ratio of the design density of the soil skeleton to its maximum density obtained by methods specified by GOST 22733-77).

Increased soil compaction - compaction of the backfill soil to a height of at least 200 mm above the pipe by compaction, ensuring soil compaction with a coefficient /C UP l of at least 0.93.

Editor V. S. Averina Technical editor M. I. Maksimova Proofreader A. G. Starostin

Delivered to embankment 02/20/86 Sub. in the oven 03/24/86 0.75 el. p.l. 0.75 el. cr.-ott. 0.70 academic Shooting range 25,000 Price

above. l. 5 kopecks

Order "Badge of Honor" Publishing house of standards, 123840, Moscow, GSP, Novopresnensky lane, 3 Type. “Moscow Printer”, Moscow, Lyalin lane, 6. Zak. 1879

STATE STANDARD OF THE USSR UNION

CONCRETE PIPES
AND REINFORCED CONCRETE

TYPES AND MAIN PARAMETERS

GOST 22000-86

STATE COMMITTEE OF THE USSR
ON CONSTRUCTION AFFAIRS

Moscow

DEVELOPED by the USSR Ministry of Construction Materials Industry

Research Institute of Concrete and Reinforced Concrete (NIIZhB) of the USSR State Construction Committee

State Design Institute "Soyuzvodkanalproekt" of the USSR State Construction Committee

All-Union Scientific Research Institute of Water Supply, Sewerage, Hydraulic Structures and Engineering Hydrogeology (VNII VODGEO) of the USSR State Construction Committee

Main Architectural and Planning Department of Moscow

Ministry of Construction, Road and Municipal Engineering

PERFORMERS

O. I. Krikunov, Ph.D. tech. sciences; V. I. Melikhov, Ph.D. tech. sciences (topic leaders);Yu. A. Kuprikov; E. G. Frolov,Ph.D. tech. sciences; K. A. Mavrin, Ph.D. tech. sciences;I. Yu. Kocherygina; A. L. Tsionsky, Ph.D. tech. sciences; Ph.D. tech. sciences;V. S. Shirokov,L. P. Khlyupin; N. L. Rips; V. I. Gotovtsev,Ph.D. tech. sciences;

Yu. M. Samokhvalov; N.K. Kozeeva; L. P. Fomicheva; V. P. Ponomarev; N. I. Berger; A. I. Dolgushin, V. I. Denshchikov

INTRODUCED by the USSR Ministry of Construction Materials Industry

Deputy Minister I.V. Assovsky

STATE STANDARD OF THE USSR UNION

CONCRETE AND REINFORCED CONCRETE PIPES

Types and main parameters

GOST
22000-86

calculated

GOST 22000-76

By Decree of the USSR State Committee for Construction Affairs dated December 30, 1985 No. 272, the introduction date was established

from 07/01/86

The standard does not apply to culverts laid under embankments of roads and railways, and drainage pipes.

The terms used in the standard and their explanations are given in the reference appendix.

2. Depending on the design operating mode of the transported liquid in the pipeline, pipes are divided into non-pressure and pressure.

2.1. Gravity pipes are divided into the following types:

T-cylindrical socket type with a round hole and butt joints sealed with sealants or other materials;

TP - the same, with a sole;

TS - cylindrical bell-shaped with a round hole, with a stepped butt surface of the sleeve end of the pipe and butt joints sealed with rubber rings;

TSP - the same, with a sole;

TB - cylindrical bell-shaped with a round hole, with a thrust collar on the butt surface of the sleeve end of the pipe and butt joints sealed with rubber rings;

TBP - the same, with a sole;

TO - the same, with an ovoid opening;

TE is the same, with an elliptical hole.

2.2. Pressure pipes are divided into the following types:

TN - cylindrical socket type with a round hole and butt joints sealed with rubber rings;

TNP - the same, with a polymer core;

TNS is the same, with a steel core.

2.3. Symbols for types of concrete pipes (as opposed to reinforced concrete) are supplemented with a capital letter “B” before the letter “T”.

3. The nominal diameter and useful length of pipes with a round hole must correspond to those indicated in the table. .

Table 1

	Pipe size	Pipe diameter, mm	Useful pipe length, mm
Concrete gravity pipes




BTS and BTSP
	BTS60.25;
	BTSP60.25
	BTS80.25;
Reinforced concrete non-pressure pipes
	BTSP80.25 BTS100.25; BTSP100.25 T40.50, TB40.50 T50.50, TB50.50 T60.50, TB60.50 T80.50, TB80.50 T100.50, TB100.50
	T120.50, TB120.50 T140.50, TB140.50 T160.50, TB160.50 TP100.50, TBP100.50






	TP120.50, TBP120.50 TP140.50, TBP140.50
	TP160.50, TBP160.50 TS100.35, TSP100.35
	TS100.50, TSP100.50 TS120.35, TSP120.35
	TS120.50, TSP120.50 TS140.35, TSP140.35



Concrete pressure pipes



Reinforced concrete pressure pipes







Reinforced concrete pressure pipes with a polymer core

Reinforced concrete pressure pipes with steel core

Notes:

1. It is allowed to accept pipes of all types greater than the useful length indicated in the table. . At the same time, their length for pipes with a nominal diameter of up to 1600 mm inclusive is assigned as a multiple of 500 mm, for pipes with a diameter of more than 1600 mm - as a multiple of 250 mm.

Reinforced concrete pressure pipes with a polymer core

Reinforced concrete pressure pipes with steel core

the internal diameter of the pipes, different from the nominal diameter of the pipe indicated in the table. , up to plus 6% - for pipes with diameters up to 600 mm inclusive and up to plus 3% - for pipes with diameters over 600 mm.

3. It is allowed, until January 1, 1990, to accept the internal diameter of pressure pipes with a steel core that is different from the diameter of the nominal diameter indicated in the table. , up to minus 7% for pipes with a diameter of 250 mm and up to minus 2% for pipes with a diameter of 300 mm and more.

3.1. The useful length of reinforced concrete free-flow pipes of types TS and TSP, equal to 2500 - 3500 mm, should be accepted only for pipes intended to be manufactured using a technology that allows complete immediate stripping.

3.2. Reinforced concrete pressure pipes of the TN type are provided with non-prestressed or prestressed reinforcement. Prestressed pipes must have a useful length of at least 5000 mm.

60-75 - for non-pressure pipes,

50-70 - for low-pressure pipes (p.),

40-65 - for medium and high-pressure pipes;

angle of rotation of the pipeline in the butt joint of the pipes is not less than 1° 30 ¢ ;

elongation of the rubber ring under tension by 8-15%;

the length of the working part of the joint, sealed with a rubber ring by the rolling method, is not less than 3.5 times the cross-sectional diameter of the ring.

3.4. The dimensions of rubber O-rings in an unstretched state must correspond to those indicated in the table. .

Table 2

Dimensions of rubber rings for pipe joints sealed using the
		slip
Ring inner diameter	Ring section diameter	Ring inner diameter	Ring section diameter

Note: It is allowed until January 1, 1990 to use rubber rings with dimensions different from those indicated in the table. , satisfying the requirements of paragraph.

the first - at an estimated height of backfilling with soil of 2 m;

second"""""4 m;

third»»»»»6 m.

It is allowed to accept reinforced concrete free-flow pipes of greater load-bearing capacity for specific conditions of pipeline construction.

4.1. The strength characteristics of free-flow pipes must ensure their operation at the design backfill height (p.) in average conditions, which correspond to: