[Civil Engineering Version] Daily Question 20180322

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A certain project is located between the South Fourth Ring Road and the Third Ring Road, with a construction area of 43,000㎡. It features a frame structure with a raft foundation, 3 underground floors, and a foundation depth of approximately 12.8 meters. The concrete foundation work was carried out by a specialized foundation construction company, the main structure was built by the municipal construction company, and the decoration work was done by the municipal decoration company. The foundation work commenced in August 2000 and was completed in October of the same year. The concrete has a strength grade of C35. During construction, it was found that the strength of some concrete samples did not meet the design requirements; however, tests showed that their actual strength was sufficient to meet those requirements. The structure and interior decoration were completed in June 2002, and when the project was finalized and archived, the foundation company and the decoration company handed over the documents to the municipal construction company. 　　Questions: (1) How should the acceptance of this foundation work be organized? (2) What requirements must be met for the quality acceptance of this foundation work to be considered successful? (3) Is it necessary to address the issue where the strength of the concrete samples does not meet the design specifications? Why? (4) Is it correct for the foundation company and the decoration company to hand over the project documents to the construction company? Why? (5) What methods can be used for the inspection and acceptance of the foundation of this project? (1) Procedures and organization for the acceptance of the foundation works: After the construction unit has completed its own inspections and filled in the relevant acceptance records (without including the supervisor’s records and conclusions), the chief supervisor (the person in charge of the project on the part of the client) should organize a meeting involving the person in charge of the construction unit, as well as the technical and quality officers, along with the persons in charge of the survey and design units, and the technical and quality officers from the construction unit. All parties involved should sign and stamp the acceptance records. 　　(2) The acceptance of the quality of the work for this sub-project (sub-sub-project) shall comply with the following requirements: 1) The quality of all the individual tasks included in the sub-project (sub-sub-project) must be approved. 　　2) The quality control documents should be complete. 　　3) The results of safety and functional inspections as well as sampling tests related to sub-projects such as foundations and footings, main structure, and equipment installation shall comply with relevant regulations. 　　4) The visual quality inspection shall meet the requirements. 　　(3) This quality issue does not require any action. The reason is that the insufficient strength of the concrete test blocks represents a quality issue identified during inspection; however, after testing, it was confirmed that these blocks meet the design requirements, so no action is necessary. 　　(4) Incorrect. Because, when a construction project is contracted out to several parties, each contractor is responsible for collecting and organizing the engineering documents related to its assigned portion of the project, and must submit them to the project owner in a timely manner. 　　(5) The methods for inspecting and accepting this foundation work are: the observation method and the auger test method.