3. Pile body quality inspection 1. "Construction Quality Acceptance Code for Building Foundation Projects"-2002 Pile body quality should be inspected. For cast-in-place piles with design grade A and low pile quality reliability, the number of random inspections should not be less than 30% of the total number and no less than 20 piles; for other pile foundation projects, the number of random inspections should not be less than 10% of the total number. . And no less than 10. There shall be no less than l columns under each column cap (Article 5.1.6). This article stipulates 100% inspection of single piles. 2. "Technical Specifications for Construction Pile Foundations" JGJ94-94 For foundation pile projects with first-class construction pile foundations and complex geological conditions or unreliable pile quality, pile quality inspection should be carried out. The detection method can adopt a reliable dynamic detection method; the number of detections is determined by the design according to the specific circumstances (Article 9.1.4). 3. "Code for Design of Building Foundations"-2002 After the construction of engineering piles, the quality of the piles should be inspected. Concrete rock-socketed piles with a diameter greater than 800mm should be tested using the core drilling method or the acoustic transmission method. The number of piles to be inspected should not be less than 10% of the total number of piles, and the number of randomly inspected piles under each column cap should not be less than 1. Explanation of regulations: Single columns and single pile rock-embedded piles with a diameter greater than 800mm must be 100% inspected (Article 10.1.7). To sum up, single column single piles with a diameter greater than 800mm must undergo 100% pile quality inspection. The inspection method should adopt the drilling and core pulling method, or the acoustic wave transmission method, or the reliable dynamic measurement method. 4. Pile body concrete sampling 1. "Construction Quality Acceptance Code for Building Foundation Projects"-3002 For piles smaller than 50m3, each pile must have a set of test specimens (mandatory provisions, Article 5.1.4).
2. "Technical Specifications for Construction Pile Foundations" JGJ94-94 For piles with a diameter larger than lm, each pile should have a set of test blocks (Article 6.2.8). 5. Vertical Bearing Capacity Testing of Single Piles 1. "Construction Quality Acceptance Code for Building Foundation Projects"-2002 Engineering piles should be tested for bearing capacity. For cast-in-place piles with design grade A and low pile quality reliability, the static load test method should be used. The number of test piles should not be less than 1% of the total number, and should not be less than 3. When the total number is less than 50, it should be no less than 2. Explanation of regulations: Regarding the number of static load test piles, if the geological conditions in the construction area are single and there is sufficient local practical experience, it can be determined by design based on the actual situation. The number of non-static test piles can be implemented in accordance with the current national industry standard "Technical Specifications for Testing of Foundation Piles in Construction Engineering" (Article 5.1.5). The number of non-static load test piles is 100% inspected in accordance with the current national industry standard "Technical Specifications for Inspection of Foundation Piles in Construction Engineering". 2. "Technical Specifications for Construction Pile Foundations" JGJ94-94 1) For pile foundation projects that meet one of the following conditions, a static load test should be used to test the vertical bearing capacity of a single pile of engineering piles. The number of tests should not be less than 1% of the total. , and should not be less than 3. When the total is less than 50, it should not be less than 2.First-class building pile foundations that have not undergone single pile static load testing before construction of engineering piles; b. Engineering
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