1.0.1 This standard is formulated with a view to meeting the needs of modern urban construction and information development, and ensuring that the materials, construction and completion acceptance indexes in communication conduit construction meet the design requirements.
1.0.2 This standard is the technical basis for the construction, supervision, follow-up acceptance, preliminary acceptance, final acceptance and preparation of completion documents of communication conduit engineering.
1.0.3 This standard is applicable to the construction and acceptance of constructed, extended and renovated communication conduit engineering.
1.0.4 In engineering construction, new processes and technologies shall be adopted to improve construction quality, reduce environmental pollution and reduce engineering cost.
1.0.5 During follow-up inspection and completion acceptance, the non-conforming work contents shall be treated and repaired by the relevant responsible units.
1.0.6 In addition to this standard, the construction and acceptance of communication conduits and passages shall also comply with those stipulated in the current relevant standards of the nation.
2 Equipment inspection
2.1 General requirements
2.1.1 The specifications, forms and quality of equipment used in communication conduit engineering shall meet the requirements of design documents and technical specifications. Such equipment shall be subjected to site inspection by the construction unit in conjunction with the development unit or (and) supervision unit, and the defective or unqualified one shall be dealt with in a timely manner.
2.1.2 Any equipment provided with a factory certificate shall be treated after quality technical appraisal if any problem is found upon inspection.
2.1.3 Inspection records shall be made for the equipment that has passed inspection.
2.1.4 After the conduit equipment enters the site, its storage, preservation, fire protection and safety shall meet the relevant technical requirements.
2.2 Cement and cement products
2.2.1 The varieties and grades of cement used in communication conduit engineering shall meet the design requirements. Before use, the date of production or certificate of cement shall be checked, and no expired cement or moisture-deteriorated cement should be used.
2.2.2 Cement of various grades shall meet the national product quality requirements. If the time from delivery to use of cement exceeds three months or the cement has signs of deterioration, it shall be tested before use, and whether to use it shall be determined according to the test results.
2.2.3 Ordinary Portland cement with cement grade 42.5 shall be used in communication conduit engineering.
2.2.4 Cement shall be protected from moisture during storage, and shall be purchased in batches, and stacked separately according to the date of purchase to avoid excessive stacking.
2.2.5 The cement properties shall meet following requirements:
1 The initial setting time of cement shall not be earlier than 45min, and the final setting time shall not be later than 600min;
2 The bulk density of cement may be 1,100kg/m3~1,300kg/m3.
2.2.6 Before the production of cement prefabricated products, at least one group (three pieces) of concrete test blocks shall be prepared according to the cement category, grade and concrete grade. The specific number of groups shall be determined by the production unit according to the needs. The specifications of these concrete test blocks shall meet the requirements of Table 2.2.6.
Table 2.2.6 Specifications of concrete test blocks (mm)
Maximum particle size of concrete aggregate Specification (length × width × height)
≤30 100×100×100
>30 150×150×150
2.2.7 The cement products shall be inspected for their specifications one by one, and cement products of different specifications shall not be stacked together.
2.2.8 The technical indexes of cement for communication conduits shall meet the relevant requirements of the current national standard GB 175 Common portland cement.
2.3 Sand
2.3.1 For the communication conduit engineering, the natural medium sand with average particle size of 0.35mm~0.5mm should be used.
2.3.2 Sand for communication conduit engineering shall meet the following requirements:
1 The content of lightweight material in sand shall not exceed 1% by weight;
2 The content of sulfides and sulfates in sand shall not exceed 0.5% by weight;
3 The clay content in sand shall not exceed 5% by weight;
4 Sand shall not contain leaves, grass roots, wood chips and other debris.
2.3.3 The bulk density of sand shall be 1,300kg/m3~1,500kg/m3 in loose state and 1,600kg/m3~1,700kg/m3 in dense state.
2.3.4 The technical indexes of sand for communication conduits shall meet the relevant requirements of the current national standard GB/T 14684 Sand for construction.
2.4 Stone
2.4.1 For the communication conduit engineering, artificial gravel or natural gravel shall be used instead of weathered stone.
2.4.2 For the communication conduit engineering, stone with continuous particle grades from 5mm to 32mm shall be used, and the large and small stone shall be used together in a reasonable way.
2.4.3 Stone for communication conduit engineering shall meet the following requirements:
1 The clay content in stone shall not exceed 1.5% by weight;
2 The content of elongated or flaky particles in stone shall not exceed 25% by weight;
3 The content of sulfides and sulfates in stone shall not exceed 1% by weight;
4 Stone shall not contain leaves, grass roots, wood chips and other debris.
2.4.4 The bulk density of stone shall be 1,350kg/m3~1,600kg/m3.
2.4.5 The technical indexes of stone for communication conduits shall meet the relevant requirements of the current national standard GB/T 14685 Pebble and crushed stone for construction.
2.5 Brick
2.5.1 The manholes (handholes) in communication conduit engineering shall be built with first-class machine-made fired common bricks.
2.5.2 Bricks for communication conduit engineering shall meet the following requirements:
1 The bricks shall be complete in shape and have good water resistance. The cinder bricks and silicate bricks with poor water resistance and reduced strength after exposure to water shall not be used;
1 General provisions 2 Equipment inspection 2.1 General requirements 2.2 Cement and cement products 2.3 Sand 2.4 Stone 2.5 Brick 2.6 Block 2.7 Water 2.8 Cement pipe block 2.9 Plastic pipes and fittings 2.10 Steel, steel pipes and irons 3 Engineering survey 4 Civil works 4.1 Trench and pit excavation 4.2 Backfilling 5 Formwork, steel bar, concrete and mortar 5.1 Formwork assembly and disassembly 5.2 Steel bar processing 5.3 Concrete pouring 5.4 Cement mortar 6 Man (hand) holes and tunnels 6.1 General requirements 6.2 Subgrade and foundation 6.3 Wall 6.4 Manhole (handhole) overlay and tunnel trench cover slab 6.5 Hole rings and covers 7 Conduit laying 7.1 General requirements 7.2 Subgrade 7.3 Foundation 7.4 Cement conduit laying 7.5 Plastic conduit laying 7.6 Steel pipe laying 8 Acceptance 8.1 Follow-up acceptance 8.2 Preliminary acceptance 8.3 Final acceptance Annex A Measurement of concrete strength by rebound tester Annex B Specifications of cement pipe blocks and end faces of porous plastic pipes Annex C Specifications of plastic pipes Annex D Reference mixture ratios and usage per cubic meter of ordinary concrete of different strength grades Annex E Shaped manholes and volumes Annex F Classification of soil and stone Annex G Items and content of engineering acceptance Explanation of wording in this standard List of quoted standards
1 General provisions
1.0.1 This standard is formulated with a view to meeting the needs of modern urban construction and information development, and ensuring that the materials, construction and completion acceptance indexes in communication conduit construction meet the design requirements.
1.0.2 This standard is the technical basis for the construction, supervision, follow-up acceptance, preliminary acceptance, final acceptance and preparation of completion documents of communication conduit engineering.
1.0.3 This standard is applicable to the construction and acceptance of constructed, extended and renovated communication conduit engineering.
1.0.4 In engineering construction, new processes and technologies shall be adopted to improve construction quality, reduce environmental pollution and reduce engineering cost.
1.0.5 During follow-up inspection and completion acceptance, the non-conforming work contents shall be treated and repaired by the relevant responsible units.
1.0.6 In addition to this standard, the construction and acceptance of communication conduits and passages shall also comply with those stipulated in the current relevant standards of the nation.
2 Equipment inspection
2.1 General requirements
2.1.1 The specifications, forms and quality of equipment used in communication conduit engineering shall meet the requirements of design documents and technical specifications. Such equipment shall be subjected to site inspection by the construction unit in conjunction with the development unit or (and) supervision unit, and the defective or unqualified one shall be dealt with in a timely manner.
2.1.2 Any equipment provided with a factory certificate shall be treated after quality technical appraisal if any problem is found upon inspection.
2.1.3 Inspection records shall be made for the equipment that has passed inspection.
2.1.4 After the conduit equipment enters the site, its storage, preservation, fire protection and safety shall meet the relevant technical requirements.
2.2 Cement and cement products
2.2.1 The varieties and grades of cement used in communication conduit engineering shall meet the design requirements. Before use, the date of production or certificate of cement shall be checked, and no expired cement or moisture-deteriorated cement should be used.
2.2.2 Cement of various grades shall meet the national product quality requirements. If the time from delivery to use of cement exceeds three months or the cement has signs of deterioration, it shall be tested before use, and whether to use it shall be determined according to the test results.
2.2.3 Ordinary Portland cement with cement grade 42.5 shall be used in communication conduit engineering.
2.2.4 Cement shall be protected from moisture during storage, and shall be purchased in batches, and stacked separately according to the date of purchase to avoid excessive stacking.
2.2.5 The cement properties shall meet following requirements:
1 The initial setting time of cement shall not be earlier than 45min, and the final setting time shall not be later than 600min;
2 The bulk density of cement may be 1,100kg/m3~1,300kg/m3.
2.2.6 Before the production of cement prefabricated products, at least one group (three pieces) of concrete test blocks shall be prepared according to the cement category, grade and concrete grade. The specific number of groups shall be determined by the production unit according to the needs. The specifications of these concrete test blocks shall meet the requirements of Table 2.2.6.
Table 2.2.6 Specifications of concrete test blocks (mm)
Maximum particle size of concrete aggregate Specification (length × width × height)
≤30 100×100×100
>30 150×150×150
2.2.7 The cement products shall be inspected for their specifications one by one, and cement products of different specifications shall not be stacked together.
2.2.8 The technical indexes of cement for communication conduits shall meet the relevant requirements of the current national standard GB 175 Common portland cement.
2.3 Sand
2.3.1 For the communication conduit engineering, the natural medium sand with average particle size of 0.35mm~0.5mm should be used.
2.3.2 Sand for communication conduit engineering shall meet the following requirements:
1 The content of lightweight material in sand shall not exceed 1% by weight;
2 The content of sulfides and sulfates in sand shall not exceed 0.5% by weight;
3 The clay content in sand shall not exceed 5% by weight;
4 Sand shall not contain leaves, grass roots, wood chips and other debris.
2.3.3 The bulk density of sand shall be 1,300kg/m3~1,500kg/m3 in loose state and 1,600kg/m3~1,700kg/m3 in dense state.
2.3.4 The technical indexes of sand for communication conduits shall meet the relevant requirements of the current national standard GB/T 14684 Sand for construction.
2.4 Stone
2.4.1 For the communication conduit engineering, artificial gravel or natural gravel shall be used instead of weathered stone.
2.4.2 For the communication conduit engineering, stone with continuous particle grades from 5mm to 32mm shall be used, and the large and small stone shall be used together in a reasonable way.
2.4.3 Stone for communication conduit engineering shall meet the following requirements:
1 The clay content in stone shall not exceed 1.5% by weight;
2 The content of elongated or flaky particles in stone shall not exceed 25% by weight;
3 The content of sulfides and sulfates in stone shall not exceed 1% by weight;
4 Stone shall not contain leaves, grass roots, wood chips and other debris.
2.4.4 The bulk density of stone shall be 1,350kg/m3~1,600kg/m3.
2.4.5 The technical indexes of stone for communication conduits shall meet the relevant requirements of the current national standard GB/T 14685 Pebble and crushed stone for construction.
2.5 Brick
2.5.1 The manholes (handholes) in communication conduit engineering shall be built with first-class machine-made fired common bricks.
2.5.2 Bricks for communication conduit engineering shall meet the following requirements:
1 The bricks shall be complete in shape and have good water resistance. The cinder bricks and silicate bricks with poor water resistance and reduced strength after exposure to water shall not be used;
Contents of GB/T 50374-2018
1 General provisions
2 Equipment inspection
2.1 General requirements
2.2 Cement and cement products
2.3 Sand
2.4 Stone
2.5 Brick
2.6 Block
2.7 Water
2.8 Cement pipe block
2.9 Plastic pipes and fittings
2.10 Steel, steel pipes and irons
3 Engineering survey
4 Civil works
4.1 Trench and pit excavation
4.2 Backfilling
5 Formwork, steel bar, concrete and mortar
5.1 Formwork assembly and disassembly
5.2 Steel bar processing
5.3 Concrete pouring
5.4 Cement mortar
6 Man (hand) holes and tunnels
6.1 General requirements
6.2 Subgrade and foundation
6.3 Wall
6.4 Manhole (handhole) overlay and tunnel trench cover slab
6.5 Hole rings and covers
7 Conduit laying
7.1 General requirements
7.2 Subgrade
7.3 Foundation
7.4 Cement conduit laying
7.5 Plastic conduit laying
7.6 Steel pipe laying
8 Acceptance
8.1 Follow-up acceptance
8.2 Preliminary acceptance
8.3 Final acceptance
Annex A Measurement of concrete strength by rebound tester
Annex B Specifications of cement pipe blocks and end faces of porous plastic pipes
Annex C Specifications of plastic pipes
Annex D Reference mixture ratios and usage per cubic meter of ordinary concrete of different strength grades
Annex E Shaped manholes and volumes
Annex F Classification of soil and stone
Annex G Items and content of engineering acceptance
Explanation of wording in this standard
List of quoted standards
