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Code of acceptance of shaft sinking and drifting of coal mine
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GB 50213-2010
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Basic data | Standard ID | GB 50213-2010 (GB50213-2010) | | Description (Translated English) | Code of acceptance of shaft sinking and drifting of coal mine | | Sector / Industry | National Standard | | Classification of Chinese Standard | P70 | | Word Count Estimation | 149,198 | | Date of Issue | 2010-05-31 | | Date of Implementation | 2010-12-01 | | Older Standard (superseded by this standard) | GBJ 213-1990 | | Quoted Standard | GB 50003; GB 50086; GB 50108; GB 50119; GB 50203; GB 50204; GB 50208; GB 50300; GBJ 107; GB 175; GB 1499.1; GB 1499.2; GB 8076; GB 13014; GB/T 18736; JGJ 18; JGJ 52; JGJ 55; JGJ 63; MT 195; MT/T 5015 | | Regulation (derived from) | Bulletin of the Ministry of Housing and Urban No. 592 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This Chinese standard applies to the quality of coal mine project acceptance. | GB 50213-2010: Code of acceptance of shaft sinking and drifting of coal mine---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to strengthen the quality management of coal mine shaft engineering, unify the quality acceptance regulations of coal mine shaft engineering, and ensure the quality of the project, this specification is formulated.
1.0.2 This code is applicable to the acceptance of coal mine shaft engineering quality.
1.0.3 The construction quality requirements of the coal mine shaft engineering contract and engineering technical documents shall not be lower than those specified in this specification.
1.0.4 In addition to conforming to this specification, the quality acceptance of coal mine shaft and roadway engineering should also conform to the provisions of the current relevant national standards.
2 terms
2.0.1 Wellbore
Refers to the passage connecting the ground and underground roadways, separate wells, inclined shafts and flat aisles. Vertical shafts are composed of well necks, well bodies, wall seats and well nests, while inclined shafts and flat aisles are composed of well (cave) mouths, well (cave) bodies and joints.
2.0.2 Main roadway
The main roadway refers to the general term for the roadway of the underground parking lot, the electromechanical chamber, the main transportation roadway, and the main return air roadway.
2.0.3 General roadway
The general roadway refers to the roadway and other chambers other than the main roadway, such as the general term of the tunnel and return air roadway in the mining area, sidewalks, etc.
2.0.4 Eye mark rate
The eye mark rate refers to the ratio of the number of blastholes with visible eye marks to the total number of peripheral holes excluding the bottom plate after blasting on the smooth surface. A blasthole scar length greater than 70% of the blasthole length counts as a visible blasthole scar. The eye mark rate is one of the main indicators for testing the quality of smooth blasting.
2.0.5 Dark well
The channel from the next level to the upper level for lifting, ventilating, getting on and off personnel, transporting materials or laying pipelines is called a dark well.
2.0.6 Cellular
Honeycomb refers to the defect that the concrete surface lacks cement slurry, the aggregate is loosely bonded, and the depth of exposed stones is greater than 5MM but less than the thickness of the protective layer.
2.0.7 Holes
Pores refer to defects on the surface of concrete that lack cement paste, aggregates are loosely bonded, and whose depth exceeds the thickness of the protective layer but does not exceed 1/3 of the cross-sectional size of the masonry.
2.0.8 Anchorage force
Anchorage force refers to the constraint force produced by the anchor rod on the surrounding rock.
2.0.9 Pull-out force (pull-out force)
Pullout resistance refers to the force that prevents the bolt from being pulled out of the rock mass.
2.0.10 Reinforced concrete arc slab
Reinforced concrete arc slabs are assembled from 4 to 8 arc-shaped reinforced concrete prefabricated components and are filled and grouted behind the wall.
2.0.11 Coarse stone
Coarse material stone refers to hexahedral material stone with regular shape and surface convex and concave depth not greater than 20MM, its thickness and width are not less than.200MM, and its length is not greater than 3 times the thickness.
2.0.12 Fine stone
Fine material stone refers to hexahedral material stone with regular shape and surface processing convex and concave depth not greater than 2MM, its thickness and width are not less than.200MM, and its length is not greater than 3 times the thickness.
2.0.13 Blind sewing
Blind seam refers to the defect of no masonry mortar cushion between two block seams.
2.0.14 Dry seam
Dry joint refers to the defect that the mortar between two blocks is not full and the gap can be penetrated.
2.0.15 Construction joints
In the process of concrete pouring, when the design requirements or construction needs to be poured in sections, the joint formed between the concrete poured first and later.
2.0.16 Well wall floating and sinking
After the well is drilled by the drilling method, in the wellbore filled with mud, the prefabricated pot bottom and the well wall are continuously connected to overcome the buoyancy of the mud and make it slowly sink to the bottom of the well.
2.0.17 Well cementing (grouting filling and cementing behind the wall)
In the construction of drilling method, after the well wall sinks and reaches the bottom of the well, the gelled slurry with a specific gravity larger than the mud is injected from bottom to top through the pipeline to the annular space between the outside of the well wall and the side of the well, and the mud is replaced to achieve solidification. End the operation of the well wall.
2.0.18 Anchor Mesh Back Support
It refers to laying steel beams, steel strips, steel bars, reinforced cement boards and other materials on the mesh surface in the anchor net support, and fixing them with anchor rods.
2.0.19 Prestressed anchor rod (anchor cable)
It is composed of anchor head, prestressed tendon and anchor body, and provides the required active support tension by prestressing the anchor rod.
2.0.20 Mud retaining wall
When the drilling method and freezing method (drilling) are used to construct the shaft shaft, the static pressure of the mud in the well (hole) is used to balance the ground pressure and the water pressure, and the mud penetrates into the surrounding rock to form a mud skin to maintain the side of the well (hole). Methods.
2.0.21 The junction of the parking lot at the bottom of the shaft (Matoumen)
The chamber with variable cross-section in the transitional section connecting the wellbore and the roadway at the bottom of the shaft.
2.0.22 Main transportation routes
The main transportation lines refer to the general term of the main inclined shaft drawway, the bottom yard, the main transportation lane and the main transportation stone gate, the ground coal transportation, the gangue transportation trunk line and the centralized loading station yard.
2.0.23 General transportation routes
General transportation routes refer to transportation routes other than main transportation routes (excluding coal mining and excavation work facing temporary roadways).
2.0.24 Floating
Floating refers to the defect that the spike or pressure plate in the track laying project is not closely attached to the rail wing.
2.0.25 empty hanging plate
Empty hanging plate refers to the defect that the two ends or one end of the sleeper are suspended or the sleeper does not fit the bottom surface of the rail.
3 Basic Regulations
3.0.1 Coal mine roadway engineering must be constructed in accordance with design and construction drawings, construction organization design, and operating procedures (or construction safety technical measures). The construction organization design and operating procedures (or construction safety technical measures) should adopt advanced technology, put forward clear engineering quality standards and requirements, and formulate corresponding quality assurance measures, which should be reviewed and approved.
3.0.2 The quality management of coal mine shaft and roadway engineering should strictly implement the responsibilities of all parties, strengthen the primary responsibility of the construction unit, and fully implement the quality lifelong responsibility system. The quality management of the construction site should have applicable construction technical standards and a sound quality management system.
3.0.3 Coal mine shaft engineering shall carry out construction quality control according to the following regulations.
1 The main materials, semi-finished products, finished products, and components used in shaft engineering shall be inspected and accepted on site, re-inspected in accordance with relevant regulations, and shall be confirmed by the supervisory engineer. When there is no supervision agency for the construction project, it shall be confirmed by the representative of the construction unit;
2.Quality control should be carried out for each process according to the construction technical standards. After each process is completed, quality inspection should be carried out and quality records should be formed.
3.0.4 The quality of coal mine shaft engineering must be checked and accepted according to the following regulations.
1.The engineering quality of wells and lanes shall comply with the provisions of this code;
2 Well and roadway engineering shall meet the requirements of engineering design documents;
3 All parties participating in the quality inspection shall have the specified qualifications;
4 The acceptance of the project quality should be carried out on the basis of the self-inspection and evaluation of the construction unit;
5.Before the hidden project is hidden, the construction unit should notify the relevant unit to check and accept, and an acceptance document should be formed;
6 Test blocks, test pieces and related materials shall be subject to witness sampling and testing in accordance with regulations;
7 The quality of sub-items should be checked and accepted according to the main control items and general items;
8 Sampling inspections should be carried out for important sub-projects involving the safety and use functions of shaft engineering;
9.Units responsible for witness sampling testing and safety testing of shaft engineering should have corresponding qualifications;
10.The visual quality of the project shall be inspected by the acceptance personnel on site and shall be confirmed jointly.
4 Engineering Division
4.0.1 The quality of coal mine shaft engineering should be checked and accepted according to unit (or sub-unit) project, division (or sub-division) project and sub-project.
4.0.2 The division of unit (or sub-unit) projects shall be determined according to the following principles.
1 A unit that has independent construction conditions and can form an independent use function is a unit project;
2 For unit projects such as well shafts and roadways that are constructed across years, they can be divided into sub-unit projects according to the construction sections of the year.
4.0.3 The division of division (or sub division) projects shall be determined according to the following principles.
1 Divisional projects can be divided according to the functions and construction conditions of the shaft engineering parts;
2 For subdivision projects such as shafts, wellbores and roadway main bodies with different support forms, they can be divided into several subdivision projects according to different support forms;
3 For subdivision projects with the same support form, such as well body and roadway main body, it can be divided into several subdivision projects according to the monthly acceptance section.
4.0.4 The sub-projects of coal mine shaft engineering should be divided according to the main construction procedures, types of work, materials, and construction techniques.
4.0.5 The unit (or sub-unit) project, sub-division (or sub-division) project and sub-item project of shaft engineering shall be divided according to Appendix A of this specification.
5 Acceptance of coal mine shaft engineering quality
5.0.1 The quality acceptance of coal mine roadway engineering should be selected according to the provisions of Appendix B of this specification.
5.0.2 The qualified quality of sub-projects shall meet the following requirements.
1 The quality of the main control items is subject to sampling inspection, and the inspection points of each inspection item should meet the qualified quality regulations; 75% or more of the inspection points meet the qualified quality regulations, and the rest of the measurement points must not affect safe use;
2.The quality of general items is subject to sampling inspection. The passing rate of the measuring points of each inspection item should reach 70% or above, and the rest of the measuring points must not affect the safe use;
3 Have a complete construction operation basis and quality inspection records.
5.0.3 Division (or sub-division) project quality acceptance shall meet the following requirements.
1.The quality of the sub-projects contained in the sub-division (or sub-division) project should be checked and accepted;
2 Quality assurance materials should be basically complete.
5.0.4 Unit (or sub-unit) project quality acceptance must meet the following requirements.
1 The quality of the subdivision (or subdivision) projects contained in the project of the unit (or subunit) shall pass the acceptance inspection;
2 Quality control data should be complete;
3 The safety and function test data of the sub-projects contained in the project of the unit (or sub-unit) should be complete;
4 The spot check results of the main functional items shall comply with the provisions of the relevant professional quality acceptance specifications;
5.The score rate of perception quality acceptance should reach 70% and above.
5.0.5 The quality acceptance records of coal mine roadway engineering should meet the following requirements.
1 Process quality acceptance shall be recorded according to the provisions of Table C.0.1 in Appendix C of this specification;
2 Sub-project quality acceptance shall be recorded according to the provisions of Table C.0.2 in Appendix C of this specification;
3 Division (or sub-division) project quality acceptance shall be recorded in accordance with the provisions of Table C.0.3 in Appendix C of this specification;
4 Unit (or sub-unit) project quality acceptance records shall meet the following requirements.
1) The unit (or sub-unit) project completion quality acceptance summary record can be recorded according to the provisions of Table C.0.4-1 in Appendix C of this specification;
2) The unit (or sub-unit) project quality control data verification records can be recorded according to the provisions of Table C.0.4-2 in Appendix C of this specification;
3) The quality inspection and acceptance records of shaft units (or sub-units) can be recorded in accordance with the provisions of Table C.0.4-3 in Appendix C of this specification;
4) The project perception quality inspection and acceptance records of inclined shafts and roadway units (or sub-units) can be recorded according to the provisions of Table C.0.4-4 in Appendix C of this specification;
5) The inspection and acceptance records of engineering perception quality of chamber units (or sub-units) can be recorded according to the provisions of Table C.0.4-5 in Appendix C of this specification;
6) The inspection and acceptance records of the track-laying units (or sub-units) of the transportation line can be recorded in accordance with the provisions of Table C.0.4-6 in Appendix C of this specification.
5.0.6 When the sub-item project quality inspection of coal mine shafts fails, it shall be dealt with according to the following regulations.
1 Sub-item projects that have been reworked and redone should be checked and accepted again;
2 Projects that can meet the requirements for safe use without treatment or that can still meet the requirements for safe use after rework, although the external dimensions have been changed, can be checked and accepted according to the technical treatment plan and negotiation documents.
5.0.7 Sub-item projects that fail to meet the requirements for safe use after safety evaluation after repair or reinforcement treatment are strictly prohibited from acceptance.
6 Acceptance procedures
6.0.1 The construction unit shall conduct self-inspection on the sub-project quality of each cycle, and shall make construction self-inspection records.
6.0.2 Sub-item projects shall be inspected and accepted by the construction unit or the professional supervision engineer of the entrusted supervision unit to organize relevant units.
6.0.3 Subdivision projects should be checked and accepted by the construction unit or the chief supervision engineer of the commissioned supervision unit to organize relevant units.
6.0.4 After the unit project is completed, the construction unit should organize relevant personnel to conduct inspection and evaluation, and submit a project completion report to the construction unit.
6.0.5 The construction unit shall apply for quality certification to the coal industry construction project quality supervision agency within 15 working days after the unit project is completed and accepted; the coal industry construction project quality supervision agency shall receive the unit project quality certification application and related materials After that, the engineering quality certification shall be organized within 15 days.
6.0.6 Coal mine roadway engineering is not subject to unit engineering quality certification, and shall not be completed (finalized) and put into use.
6.0.7 Only after the quality acceptance of all unit projects is qualified can the individual project completion acceptance and quality certification be carried out.
7 Excavation works
7.1 Alluvium Excavation Engineering
Ⅰ Master Control Item
7.1.1 Alluvial layer excavation and temporary support shall comply with the relevant provisions of the construction organization design and operating procedures.
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. random inspection of construction inspection records or on-site inspection.
7.1.2 The allowable deviation of alluvium excavation specifications shall comply with the specifications in Table 7.1.2.
Table 7.1.2 Allowable Deviation of Section Specifications for Alluvial Layer Excavation
Ⅱ General Items
7.1.3 When open trenches are used to excavate the wellhead of inclined shafts and the openings of flat aisles, the allowable deviation and inspection method of the external dimensions of the open trenches shall comply with the provisions in Table 7.1.3.
Table 7.1.3 Permissible deviation and inspection method of external dimensions of exposed grooves
7.2 Bedrock Excavation Works
7.2 Bedrock Excavation Works
Ⅰ Master Control Item
7.2.1 When the bedrock is excavated by blasting method, smooth blasting should be adopted, the blasting chart should be complete, and the selection of blasting parameters should be reasonable. The construction of smooth blasting shall comply with the provisions of the operating regulations.
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. random inspection of construction inspection records against specifications and operating procedures, or on-site inspection.
7.2.2 Temporary support for bedrock excavation shall comply with the provisions of the operation regulations.
Inspection method. random inspection of construction inspection records against operating procedures or on-site inspection.
7.2.3 The permissible deviation of the bedrock excavation section specification shall comply with the provisions in Table 7.2.3.
Table 7.2.3 Allowable Deviation of Bedrock Excavation Section Specifications
Check item
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. measure with a wire ruler, or spot-check construction inspection records.
7.2.4 The excavation specification of soft rock (including broken zone) shall not be less than the designed roadway width and height after considering the allowable deviation.
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. measure with a hanging wire or spot check construction inspection records.
7.2.5 The deviation of the tunneling slope shall not exceed ±1‰.
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. measure the ratio of the vertical distance difference between two adjacent inspection points from the waistline to the rail surface (or bottom plate) and the distance between the two inspection points.
Ⅱ General Items
7.2.6.The allowable deviation and inspection method of wall seat (or support ring), water ditch (including pipeline groove), and equipment foundation excavation section specifications shall comply with the provisions in Table 7.2.6.
Table 7.2.6 Wall seat (or support ring), water ditch (including pipeline groove), equipment foundation
Permissible Deviation and Inspection Method of Excavation Section Specifications
Test items
Allowable deviation (mm)
Testing method
7.3 Excavation project of naked shaft
Ⅰ Master Control Item
7.3.1 When the drilling and blasting method is used for construction, smooth blasting should be adopted for the excavation of naked shafts, the blasting charts should be complete, and the selection of blasting parameters should be reasonable. The construction of smooth blasting shall comply with the provisions of the operating regulations.
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. random inspection of construction records against specifications and blasting charts, or on-site inspection.
7.3.2 The allowable deviation of the excavation section specification of the bare shaft roadway shall comply with the provisions of 7.3.2.
Table 7.3.2 Permissible Deviation of Excavation Section Specifications for Bare Shaft Works
Inspection Quantity. Select the measuring points of the inspection points according to the provisions of Appendix B of this specification.
Inspection method. measure with a wire ruler, or spot-check construction inspection records.
7.3.3 The excavation slope deviation of naked shaft shall not exceed ±1‰.
Inspection quantity. select inspection points and measuring points according to the regulations in Appendix B of the specification.
Inspection method. measure the ratio of the distance difference between two adjacent inspection points from the waistline to the rail surface (or floor) and the distance between the two inspection points.
Ⅱ General Items
7.3.4 In the excavation of naked roadway, the rate of eye marks around smooth surface blasting shall not be less than 60%.
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. on-site inspection, or random inspection of construction inspection records.
7.4 Underground shaft excavation works
Ⅰ Master Control Item
7.4.1 In the underground shaft excavation project, it shall be ensured that the positions of the upper and lower ports meet the design requirements.
Inspection method. Check the actual measurement map of the upper and lower mouth positions of the hidden well against the design.
7.4.2 The allowable deviation of the excavation radius of the underground shaft shall comply with the provisions in Table 7.4.2.
Table 7.4.2 Permissible Deviation of Radius of Underground Shaft Excavation
8 Concrete and reinforced concrete works
8.1 Formwork project
Ⅰ Master Control Item
8.1.1 The formwork and its supports shall be designed according to the conditions of the project structure, project type, load magnitude, rock and soil category, construction equipment and material supply, and allowable deviation.
8.1.2 Before pouring concrete, form work should be checked and accepted. After the formwork is installed and during the pouring of concrete, the formwork and its brackets should be observed and maintained. When abnormal situations occur, they should be dealt with in a timely manner according to the construction technical plan.
8.1.3 The materials, specifications, and structural bearing capacity and rigidity of formwork (including corrugated tires) shall comply with the design, operating procedures and current relevant national standards.
Inspection method. check against the provisions of the design, procedures, and specifications. For the stereotyped formwork produced by a regular factory, check the factory certificate and instructions, and assemble and verify it before use; the non-stereotyped formwork designed and processed by the construction unit itself should be assembled, debugged, and tested before leaving the factory. Construction, construction, processing and other units organize inspection and acceptance. After the reusable formwork has been overhauled and reshaped, it shall be inspected according to the above-mentioned inspection method.
8.1.4 For the vertical shaft constructed by freezing method, when the inner shaft wall adopts integral sliding steel formwork, the allowable deviation of the first assembly in the underground shall comply with the provisions in Table 8.1.4, and the construction and construction units shall be organized by the supervisor before pouring concrete Inspection and acceptance.
Table 8.1.4 Permissible deviation for the first assembly of vertical shaft integral sliding steel formwork underground
Check item
Allowable deviation (mm)
Inspection method. comparative design, actual inspection at the underground construction site.
8.1.5 For the single-layer concrete well wall of shaft sinking by common method and the outer layer of reinforced concrete well wall of well sinking by freezing method, the allowable deviation of the first assembly underground with integral movable steel formwork shall comply with the provisions in Table 8.1.5.The concrete shall be jointly inspected and accepted by the supervision, construction, construction and other units.
Table 8.1.5 Permissible deviation for the first assembly of vertical shaft integral mobile steel formwork underground
Acceptance method. compared with the design, actual measurement and inspection at the underground construction site.
8.1.6 The permissible deviation of the ground assembly specifications for the inner and outer combined steel formwork of the prefabricated concrete well wall for vertical shaft drilling shall comply with the provisions in Table 8.1.6.
Table 8.1.6 Inner and outer combination of prefabricated concrete well wall for well drilling by drilling method
Allowable Deviation of Steel Formwork Assembly Specifications
Check item
Allowable deviation (mm)
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. comparative design, prefabricated on-site inspection.
8.1.7 When the vertical shaft adopts combined steel formwork, the allowable deviation of the underground assembly specifications shall comply with the provisions in Table 8.1.7.
Table 8.1.7 Permissible Deviation of Downhole Assembly Specifications for Shaft Composite Steel Formwork
Check item
Allowable deviation (mm)
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. comparative design, actual inspection at the underground construction site.
8.1.8 The thickness of the concrete should be ensured when supporting the formwork, and its allowable deviation should meet the following requirements.
1 shaft position -50mm;
2 Inclined shafts, pits, roadways, and chambers are all -30mm.
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. the minimum value of the scale, or random inspection of construction inspection records.
Ⅱ General Items
8.1.9 For the combined steel formwork used in inclined shafts, adits, roadways and chambers, the allowable deviation and inspection method of the underground assembly specifications shall comply with the provisions in Table 8.1.9.
Table 8.1.9 Permissible deviation and inspection method of steel formwork assembly specifications for inclined shaft, adit, roadway and chamber combination
Check item
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
8.1.10 The allowable deviation and inspection method for gutters, grooves, and step formwork assembly shall comply with the table
8.1.10.
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification, and randomly check the "Process Quality Inspection and Acceptance Record".
Table 8.1.10 Permissible deviation and inspection method for gutter, trench and step formwork assembly
8.1.11 The allowable deviation and inspection method for the assembly of the equipment foundation and reserved anchor bolt hole formwork shall comply with the provisions in Table 8.1.11.
Table 8.1.11 Allowable deviation and inspection method for assembly of equipment foundation, reserved anchor bolt hole formwork
Inspection quantity. Select inspection points and measuring points according to the provisions of Appendix B of this specification.
Inspection method. during the completion acceptance, spot check the construction inspection records.
8.2 Reinforcement works
Ⅰ Master Control Item
8.2.1 The type, specification and performance of steel bars and steel bar products shall comply with the design requirements and the relevant current national standards. When the type, grade or specification of steel bars need to be changed, the design change procedures shall be handled.
8.2.2 Before the formwork is erected, the steel bar concealment project acceptance shall be carried out, and the contents include.
1 Types, specifications, quantities, positions, etc. of longitudinal and transverse steel bars;
2 The connection method, joint position, joint quantity, joint area percentage of steel bars, etc.;
3 The type, specification, quantity, spacing, etc. of the stirrups;
4 Specifications, quantity, location, etc. of embedded parts.
8.2.3 When steel bars and finished steel products enter the site, checks should be made on the type, specification, date of delivery, etc., and the strength and other necessary performance indicators should be re-inspected batch by batch. The quality should meet the relevant current national standards.
Quantity for inspection. 60 tons of steel bars and finished steel products that come in continuously from the same manufacturer, the same grade, the same variety, and the same batch number are counted as a batch (less than 60 tons are counted as a batch), and each batch is randomly inspected once. Among them, the quantity of each batch of cold-drawn steel bars should not exceed 20t, the quantity of each batch of cold-drawn low-carbon steel wire should not exceed 5t, and the quantity of each batch of cold-rolled twisted steel bars should not exceed 10t.
Inspection method. Check the product certificate, factory inspection report and entry re-inspection report.
8.2.4 The grades and properties of electrodes and fluxes should meet the design requirements and the current relevant national standards.
Inspection method. check the factory certificate.
8.2.5 The specifications of steel bar processing shall meet the design requirements.
Inspection method. measuring and inspecting steel bars before going into the well.
8.2.6 The lap length of steel bars shall meet the design requirements, and the staggering of lap joints shall comply with the relevant national standards. When it is difficult to stagger the overlapping joints of the wellbore and wall of the shaft or the roadway in the construction of sections, the steel bars in the full section should ensure that the overlapping length conforms to the relevant current national standards. Straight thread joints should be used for the mechanical connection of steel bars and should meet the specified performance requirements.
Inspection Quantity. Full inspection.
Inspection method. scale inspection, or random inspection of construction inspection records.
8.2...
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