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Delivery: <= 10 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 50202-2018: Standard for acceptance of construction quality of building foundation Status: Valid GB 50202: Historical versions
Basic dataStandard ID: GB 50202-2018 (GB50202-2018)Description (Translated English): Standard for acceptance of construction quality of building foundation Sector / Industry: National Standard Classification of Chinese Standard: P22 Word Count Estimation: 148,159 Date of Issue: 2018-03-16 Date of Implementation: 2018-10-01 Older Standard (superseded by this standard): GB 50202-2002 Regulation (derived from): Ministry of Housing and Urban-Rural Development Notice 2018 No. 23 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation GB 50202-2018: Standard for acceptance of construction quality of building foundation---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 construction quality management of building foundation engineering, unify the acceptance of construction quality of building foundation engineering, and ensure the quality of engineering construction, this standard is formulated. 1.0.2 This standard is applicable to the acceptance of construction quality of building foundation engineering. 1.0.3 In addition to this standard, the construction quality acceptance of building foundation works shall also comply with the provisions of the current relevant national standards. 2 terms 2.0.1 Inspection inspection The activity of measuring, inspecting, testing, etc. the characteristics and performance of the project, and comparing the results with the requirements specified in the design and standards to determine whether each performance of the project meets the requirements. After building materials, components, equipment and utensils enter the construction site, on the basis of the appearance quality inspection and the verification of quality certification documents meeting the requirements, samples are taken from the construction site and sent to the laboratory for inspection in accordance with relevant regulations. 2.0.2 acceptance On the basis of the construction unit's own inspection, it is an activity to confirm whether the project quality meets the qualified standard in written form according to the design documents and relevant standards. 2.0.3 dominant item Inspection items that play a decisive role in quality, safety, energy saving, environmental protection and main functions in construction projects. 2.0.4 general item general item Inspection items other than master control items. 2.0.5 ground inspection After the foundation pit or foundation trench is excavated to the design elevation of the bottom of the pit, it is an activity to check whether the foundation meets the requirements. 3 Basic Regulations3.0.1 The construction quality acceptance of foundation works shall meet the following requirements. 1.The construction quality of the foundation works shall meet the requirements of the inspection and acceptance regulations; 2.The procedure of quality inspection shall meet the requirements of acceptance regulations; 3 The acceptance of the project quality should be carried out on the basis of the construction unit's own inspection and evaluation; 4 The quality acceptance shall be carried out by division and sub-item project acceptance; 5 Quality acceptance shall be checked and accepted according to main control items and general items. 3.0.2 The following materials should be submitted during the acceptance of foundation works. 1 Geotechnical investigation report; 2 Design documents, joint review records of drawings and technical disclosure materials; 3 Records of engineering survey, positioning and setting out; 4 Construction organization design and special construction plan; 5 Construction records and construction unit self-inspection assessment report; 6 monitoring data; 7 Acceptance data of concealed works; 8 Inspection and inspection report; 9 As-built drawings. 3.0.3 Forms should be prepared for the inspection items carried out before construction and during construction, and corresponding records should be made, reviewed and archived. 3.0.4 Tank inspection must be carried out for foundation works, and the key points of tank inspection shall comply with the provisions in Appendix A of this standard. 3.0.5 The quality inspection results of the main control items must all meet the inspection standards, and the acceptance rate of general items should not be lower than 80%. 3.0.6 The inspection quantity shall be sampled according to the inspection batch. When there are specific regulations in this standard, it shall be implemented according to the corresponding clauses. If there is no regulation, it shall be sampled according to the inspection batch. The division of inspection batches and the sampling quantity of inspection batches can be carried out in accordance with the provisions of the current national standard "Unified Standards for Construction Quality Inspection and Acceptance of Construction Engineering" GB 50300. 3.0.7 When the strength assessment of the foundation standard test piece does not meet the requirements or there is doubt about the representativeness of the test piece, the strength test should be carried out on the entity. When the test result meets the design requirements, it can be accepted as qualified. 3.0.8 The quality inspection of raw materials shall comply with the following regulations. 4.3.2 During the construction, the layer thickness, the compaction of the overlapped part during the segmental construction, the amount of water added, the number of compaction times, and the compaction coefficient should be checked. 4.3.3 After the construction is completed, the bearing capacity of the foundation shall be inspected. 4.3.4 The quality inspection standards for sand and gravel foundations shall comply with the provisions in Table 4.3.4. Table 4.3.4 Sand and gravel foundation quality inspection standards 4.4 Geosynthetic foundation 4.4.1 Before construction, the mass per unit area, thickness, specific gravity, strength, elongation, and quality of soil and sand and gravel of geosynthetics should be checked. Geosynthetic materials are taken as a batch of 100m2, and 5% of each batch should be randomly checked. 4.4.2 During the construction, check the cleaning condition of the foundation trench, the laying thickness and flatness of the backfill, the laying direction of the geosynthetics, the length of the joints or the condition of the joints, the connection between the geosynthetics and the structure, etc. 4.4.3 After the construction is completed, the bearing capacity of the foundation shall be inspected. 4.4.4 Geosynthetic foundation quality inspection standards shall comply with the provisions of Table 4.4.4. Table 4.4.4 Quality Inspection Standards for Geosynthetic Foundation 4.5 Fly ash foundation 4.5.1 The quality of the fly ash material should be checked before construction. 4.5.2 During the construction, the layer thickness, the number of rolling times, the control of water content in construction, the degree of rolling in the overlapping area, and the compaction coefficient should be checked. 4.5.3 After the construction is completed, the bearing capacity inspection should be carried out. 4.5.4 The quality inspection standard of fly ash foundation shall meet the requirements in Table 4.5.4. Table 4.5.4 Quality Inspection Standards for Fly Ash Foundation 4.6 Dynamically compacted foundation 4.6.1 Before construction, check the quality and size of the rammer, the control method of falling distance, the drainage facilities and the soil quality of the rammed foundation. 4.6.2 During construction, the drop distance of the rammer, the position of the tamping point, the range of tamping, the number of tamping strikes, the number of tamping passes, the amount of ramming per ramming, the average ramming amount of the last two rammings, the total ramming amount and Ramping point construction start and end time, etc. 4.6.3 After the construction is completed, the bearing capacity of the foundation, the strength of the foundation soil, the deformation index and other design requirements shall be inspected. 4.6.4 The quality inspection standard of the dynamic compaction foundation shall comply with the provisions in Table 4.6.4. Table 4.6.4 Quality Inspection Standards for Dynamically Compacted Foundation 4.7 Grouting foundation 4.7.1 The position of the grouting point, the proportion of the grout, the properties of the materials used in the grout and the performance of the grouting equipment should be checked before construction. 4.7.2 During the construction, the grout ratio and main performance indicators, the grouting sequence and the pressure control during the grouting process shall be randomly checked. 4.7.3 After the construction is completed, the foundation bearing capacity, foundation soil strength and deformation index inspection should be carried out. 4.7.4 The quality inspection standard of the grouted foundation shall comply with the provisions in Table 4.7.4. Table 4.7.4 Inspection Standards for Grouting Foundation Quality 4.8 Preloaded foundation 4.8.1 The construction monitoring measures and monitoring initial data, drainage facilities and vertical drainage bodies should be checked before construction. 4.8.2 During the construction, the surcharge height and deformation rate should be checked. During the vacuum preloading construction, the sealing performance of the sealing film and the reading of the vacuum gauge should be checked. 4.8.3 After the construction is completed, the bearing capacity of the foundation and the strength and deformation indicators of the foundation soil shall be inspected. 4.8.4 The quality inspection standard of preloaded foundation shall comply with the provisions in Table 4.8.4. Table 4.8.4 Quality Inspection Standards for Preloaded Foundation 4.9 Sand and gravel pile composite foundation 4.9.1 The mud content and organic matter content of sand and gravel should be checked before construction. The performance of the vibrating device should be checked before the construction of the vibrating method, and the ammeter and voltmeter should be verified or calibrated. 4.9.2 During construction, the pile position, filling amount, elevation and verticality of each gravel pile should be checked. In the construction of vibratory method, the compaction current, water supply pressure, water supply volume, filler quantity, vibration retention time, vibro point position, and vibroconstruction parameters should be checked. 4.9.3 After the construction is completed, the bearing capacity of the composite foundation and the compactness of the pile should be inspected. 4.9.4 The quality inspection standard of sand-stone pile composite foundation shall meet the requirements in Table 4.9.4. Table 4.9.4 Standards for Quality Inspection of Sandstone Pile Composite Foundation Note. 1 The degree of tamping refers to the ratio of the thickness of the tamped cushion layer to the thickness of the virtual bedding; 2 D is the design pile diameter (mm). 4.10 High-pressure jet grouting composite foundation 4.10.1 The quality of cement, external admixture, etc., pile position, grout ratio, performance of high-pressure injection equipment, etc. should be inspected before construction, and the pressure gauge and flow meter should be verified or calibrated. 4.10.2 Construction parameters and construction procedures such as pressure, cement slurry volume, lifting speed, and rotation speed should be checked during construction. 4.10.3 After the construction is completed, the strength and average diameter of the pile body, as well as the bearing capacity of the single pile and the composite foundation should be inspected. 4.10.4 The quality inspection standard of high-pressure jet grouting composite foundation shall comply with the provisions in Table 4.10.4. Table 4.10.4 Quality Inspection Standards for High Pressure Jet Grouting Composite Foundation Note. D is the design pile diameter (mm). 4.11 Composite foundation of cement-soil mixing piles 4.11.1 Before construction, the quality of cement and external admixtures, pile position, and mixer performance should be checked, and various measuring equipment should be checked or calibrated. 4.11.2 During the construction, the lifting speed of the machine head, the amount of cement slurry or cement injection, the length and elevation of the mixing pile should be checked. 4.11.3 After the construction is completed, the strength and diameter of the pile body, as well as the bearing capacity of the single pile and the composite foundation should be inspected. 4.11.4 The quality inspection standard of cement-soil mixing pile foundation shall meet the requirements in Table 4.11.4. Table 4.11.4 Cement-soil mixing pile foundation quality inspection standard Note. D is the design pile diameter (mm). 4.12 Composite foundation of soil and lime soil compaction piles 4.12.1 The quality of lime and soil, pile position, etc. should be checked before construction. 4.12.2 The pile hole diameter, pile hole depth, tamping times, water content of filler and compaction coefficient should be checked during construction. 4.12.3 After the construction is completed, the quality of the piles and the bearing capacity of the composite foundation should be inspected. 4.12.4 The quality inspection standard of soil and lime-soil compaction pile composite foundation shall meet the requirements in Table 4.12.4. Table 4.12.4 Quality Inspection Standards for Composite Foundation of Soil and Lime-soil Compaction Pile Note. D is the design pile diameter (mm). 4.13 Cement fly ash gravel pile composite foundation 4.13.1 Raw materials such as cement, fly ash, sand and gravel should be inspected before construction. 4.13.2 During the construction, the mixture ratio, slump, hole-forming depth, filling coefficient of the mixture, etc. of the pile body mixture should be checked. 4.13.3 After the construction is completed, the quality of the pile body, the bearing capacity of the single pile and the composite foundation shall be inspected. 4.13.4 The quality inspection standard of cement fly ash macadam pile composite foundation shall comply with the provisions in Table 4.13.4. Table 4.13.4 Criteria for Quality Inspection of Cement Fly Ash Gravel Pile Composite Foundation Note. D is the design pile diameter (mm). 4.14 Rammed soil-cement pile composite foundation 4.14.1 Before construction, the quality of cement and rammed soil should be inspected. 4.14.2 During construction, the hole position, hole depth, hole diameter, ratio of cement and soil, and water content of the mixture should be checked. 4.14.3 After the construction is completed, the quality of the pile body, the bearing capacity of the composite foundation and the tamping degree of the cushion layer shall be inspected. 4.14.4 The quality inspection standard for compacted cement-soil piles shall comply with the provisions in Table 4.14.4. Table 4.14.4 Quality Inspection Standards for Compacted Cement-Soil Pile Composite Foundation Note. D is the design pile diameter (mm).5 basic engineering5.1 General provisions 5.1.1 For extended foundations, raft-shaped and box-shaped foundations, caissons and caissons, the setting-out dimensions should be rechecked before construction; the placed axis and pile positions should be rechecked before construction of pile foundation works. The allowable deviation of stakeout for group pile positions should be 20mm, and the allowable deviation for stakeout for single-row pile positions should be 10mm. 5.1.2 The pile position deviation of prefabricated piles (steel piles) shall comply with the provisions in Table 5.1.2.The deviation of the inclination of the inclined pile shall be 15% of the tangent of the inclination angle. Table 5.1.2 Allowable deviation of pile position for prefabricated piles (steel piles) Note. H is the distance (mm) from the pile foundation construction surface to the designed pile top. 5.1.3 The test pieces for concrete strength inspection of cast-in-situ piles shall be randomly selected at the construction site. Concrete from the same batching plant must retain at least one set of test pieces for every 50m3 of pouring; when the concrete pouring volume is less than 50m3, at least one set of test pieces must be left for every 12 hours of continuous pouring. For single-column and single-pile, at least one set of test specimens shall be retained for each pile 5.1.4 The pile diameter, verticality and allowable deviation of pile position of cast-in-situ piles shall comply with the provisions in Table 5.1.4. Table 5.1.4 Permissible deviation of pile diameter, verticality and pile position of cast-in-place piles Note. 1 H is the distance from the pile foundation construction surface to the designed pile top (mm); 2 D is the design pile diameter (mm). 5.1.5 Engineering piles shall be inspected for bearing capacity and integrity of the pile body. 5.1.6 When the design grade is Class A or the geological conditions are complex, the bearing capacity of the pile foundation shall be inspected by the static load test method, and the number of inspection piles shall not be less than 1% of the total number of piles, and shall not be less than 3, when the total number of piles is less than 50, it should not be less than 2.In areas with experience and comparative data, pile foundations with design grades B and C can use the high strain method to test the vertical compressive bearing capacity of pile foundations, and the number of tests should not be less than 5% of the total number of piles. And should not be less than 10. 5.1.7 The number of random checks for the integrity of the pile body of engineering piles should not be less than 20% of the total number of piles, and should not be less than 10.The number of piles under each column cap shall not be less than 1. 5.2 Unreinforced extension foundation 5.2.1 The setting-out size should be inspected before construction. 5.2.2 The masonry quality, mortar strength, axis and elevation should be inspected during construction. 5.2.3 After the construction is completed, the strength of the concrete, the position of the axis, and the elevation of the top surface of the foundation should be inspected. 5.2.4 The quality inspection standard of unreinforced expanded foundation shall comply with the provisions in Table 5.2.4. Table 5.2.4 Quality Inspection Standards for Unreinforced Expanded Foundation Note. L is the length (m); B is the width (m). 5.3 Extended foundation in reinforced concrete 5.3.1 The setting-out size should be inspected before construction. 5.3.2 During construction, steel bars, formwork, concrete, axis, etc. should be inspected. 5.3.3 After the construction is completed, the concrete strength, axis position and foundation top surface elevation shall be inspected. 5.3.4 The quality inspection standard of reinforced concrete expanded foundation shall comply with the provisions in Table 5.3.4. Table 5.3.4 Quality Inspection Standards for Reinforced Concrete Expanded Foundation Note. L is the length (m); B is the width (m). 5.4 Raft and box foundations 5.4.1 The setting-out size should be inspected before construction. 5.4.2 During the construction, the axis, embedded parts, center line position of the reserved hole, steel bar position and steel bar protective layer thickness should be inspected. 5.4.3 After the construction is completed, the concrete strength, axis position, foundation top surface elevation and flatness of the raft and box foundations shall be inspected and accepted. 5.4.4 The quality inspection standards for raft and box foundations shall comply with the provisions in Table 5.4.4. Table 5.4.4 Quality Inspection Standards for Raft and Box Foundations 5.4.5 During the construction of mass concrete, check the concrete slump, mix ratio, pouring layer thickness, slope and setting of temperature measuring points, and the pouring time of the upper and lower layers should not exceed the initial setting time of the concrete. During curing, the temperature difference between the temperature within 50mm~100mm of the surface of the concrete structural member and the temperature inside the concr......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 50202-2018_English be delivered?Answer: Upon your order, we will start to translate GB 50202-2018_English as soon as possible, and keep you informed of the progress. The lead time is typically 6 ~ 10 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB 50202-2018_English with my colleagues?Answer: Yes. The purchased PDF of GB 50202-2018_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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