After the foundation of the building or the trench of the pipeline is excavated according to the design elevation, the project manager requires the supervision unit to organize trench inspection, and the project engineer, supervision engineer, construction unit and survey and design unit require to confirm whether the soil quality meets the bearing capacity requirements as soon as possible. If further treatment is needed, it can be handled in the form of engineering contact sheet and signed by the designer.
2. Concealed acceptance of foundation backfill.
Backfill soil of foundation shall be compacted and filled by layers according to the soil or materials required by design drawings, and according to the requirements of construction and acceptance specifications, please ask the quality supervision station to borrow soil to check its compactness, and the compaction coefficient shall meet the design requirements. Ensure that the backfill soil does not produce large settlement.
3. Concealed acceptance of reinforcement in concrete engineering.
Before entering the site, check whether there is a certificate of conformity for the raw materials of reinforcement, that is, the certificate should indicate the specification, model, furnace number, batch number, quantity, production date and manufacturer of reinforcement. At the same time, samples should be taken for physical properties and chemical composition inspection, and qualified samples can enter the site in batches.
4. Concealed acceptance of embedded pipes, embedded iron pieces and hydropower pipelines on concrete structures.
Waterproof casing, embedded iron pieces, electrical pipelines, water supply and drainage pipelines, etc. are usually hidden in concrete structures, and should be concealed and accepted before concrete pouring and mold sealing. First, check whether the raw materials have a certificate of approval and witness inspection, and qualified materials are allowed to be used; Then it is necessary to add material specifications and processing to check whether the casing and iron parts meet the design requirements.
The buried position of hydropower pipeline should be checked whether it is reasonable and can meet the requirements according to the use characteristics. Only after the acceptance is qualified can you sign the concealment acceptance record and agree to concealment.
Extended data
Because of the quality problems of concealed works, they have to be covered again, resulting in heavy losses such as rework. In order to avoid the waste of resources and the loss of both parties, and ensure the project quality and smooth completion, the contractor shall notify the employer to check before the concealed works are concealed, and the concealed works can be carried out only after the employer has passed the inspection.
In practice, when the project is covered with concealed conditions, the contractor should first conduct self-inspection. After passing the self-inspection, he should promptly notify the employer or the site representative stationed by the employer, check the conditions of the concealed project before the concealed project is concealed, and participate in the operation of the concealed project.
The notice includes the contractor's self-inspection records, hidden contents, inspection time and place. After receiving the notice, the Employer or its on-site representative shall arrive at the concealed site within the required time to check the concealed works. After passing the inspection, the employer or its representative stationed at the site shall sign the inspection record, and the contractor may carry out concealed construction only after passing the inspection.
The Employer shall have the right to require the Contractor to improve the engineering conditions within a certain period of time when it finds that the concealed engineering conditions are unqualified.
If the conditions of concealed works meet the requirements of the specification, and the Employer or its representative in the site refuses to sign the inspection record after inspection, it can be regarded as the employer's approval in practice, and the contractor can carry out concealed works.
Baidu Encyclopedia-Acceptance of Concealed Works