Covert Engineering Control Rules

The concealed project must be checked and accepted before the next process begins. The project engineering department will handle it according to the “project acceptance control procedure”, including:

1. Foundation pit and base trough acceptance

After excavation of the building foundation or pipeline foundation trenches according to the design elevation, the project manager requires the supervision organization to organize the inspection of the trenches. The engineers, supervision engineers, construction agencies, surveying and design agencies of the project engineering department must confirm on-the-spot whether the soil quality meets the bearing capacity requirements as soon as possible. If you need to deepen the treatment, you can sign the confirmation by the designer through the method of engineering contact list. The foundation pit or base tank acceptance records shall be signed by the above five parties, and shall be concealed as soon as possible after acceptance so as not to be soaked by rain.

2. Basic backfill covert acceptance

The basic backfill work should be stratified according to the requirements of the design of the earth or material layered, and according to the "construction and acceptance specifications" requirements, please check the quality inspection station to check the compactness of the compaction, compaction coefficient to meet the design requirements. To ensure that the backfill soil does not produce a large settlement.

3. Reinforced steel concealment inspection

(1) Check whether there is certificate of conformity before the steel bar raw material enters the market, that is, the steel plate specification, model number, furnace number, batch number, quantity, date of manufacture, and manufacturer shall be specified on the certificate. At the same time, samples should be taken for physical property and chemical composition inspection, and qualified parties can enter the market in batches.

(2) Check whether the specifications, quantity and spacing of reinforced steel banding meet the requirements of design drawings. The number of joints and the length of lap joints in the same section must meet the requirements of the Code. For the welded steel bars, first test the welder's welding quality. Then, according to the requirements in the “Specifications”, the samples shall be taken for welding test pieces. The unqualified welding samples shall be doubled according to the requirements to ensure the quality of the welded joints.

(3) Acceptance of reinforced protective layers according to design requirements.

(4) There is an unsatisfactory supervision notice to be issued for inspection and acceptance until it is fully qualified and can be signed on the “Concealed Acceptance Record Form” for approval.

4. The concealed acceptance of pre-embedded pipes, embedded iron pieces and hydropower lines on the structure.

The concrete structure usually has waterproof casing, embedded iron pieces, electrical pipelines, and water supply and drainage pipelines that need to be concealed. Before the concrete is poured and sealed, it must be concealed and checked. The first step is to check whether the raw materials are certificated and whether there is evidence to send it. Inspection, only qualified materials are allowed to use; then check the casing, iron plus material specifications and processing meet the design requirements; again to check the placement of the elevation, axis and other specific locations are accurate; and check whether the fixing method is Reliable, can ensure that no deformation or displacement in the pouring process. The buried position of the hydropower pipeline should be checked according to the characteristics of its use and whether it can meet the requirements. Acceptance before passing the "Concealed Acceptance Record Form" sign consent to covert.

5. Hidden acceptance of lightning protection and down-construction of buildings, electrical equipment and electrical equipment

In addition to the materials, specifications, quantity, spacing, and materials specified in the design, the installation of lightning protection deflectors for buildings and electromechanical equipment must be tested and accepted by a professional engineer. The grounding resistance must meet the design requirements.

6. The concealed inspection before the decoration of the concrete structure and masonry project

The concrete structure and masonry shall undergo concealed intermediate acceptance before the decorative plastering. The concrete structure shall be inspected for all material certifications and pressure test reports. The field strength rebound or borehole sampling pressure test shall be performed. The surface density of the crucible shall be inspected. And whether the structural geometry meets the design requirements. The masonry shall check whether the raw material certificate, mortar content ratio, mortar pressure test report and other related information are complete, and check if the anti-seismic structure is connected with the reinforcing steel bar. Check whether the masonry masonry method and the mortar joint meet the design requirements. Axis, position, thickness, etc. meet the requirements of the drawings.

The main participants in the inspection and acceptance are the engineer of the project engineering department, the engineer of the municipal quality supervision and inspection station, the supervision engineer, the representative of the design unit and the representative of the construction unit. After acceptance, fill in the "Concealed Acceptance Record Form" and jointly sign the contract. If there is a problem with the acceptance, the supervisor shall issue the supervision and rectification notice to rectify the deadline. After the rectification is completed, the above-mentioned personnel shall be re-inspected. After the re-qualification, the decoration and plastering will be concealed. .

7. Covert acceptance of waterproof works

Before the construction of the waterproof layer, check whether the base layer is smooth and smooth, whether it is cleaned, and whether the moisture content is less than the design value. Whether the waterproof material is the same as the design, and there is a witnessing inspection. After the construction of the waterproof layer, check whether the waterproof layer material is consistent with the design, whether the thickness meets the requirements, and whether the weak link is specially treated according to the design requirements. The key is whether or not the water test can be qualified. After passing the inspection, the “Hidden Acceptance Record Form” can be filled out. After the joint signing, the concealment can be done and the construction of the next process can be carried out.

8. Concealment of underground pipelines

Underground pipeline hidden by the professional engineer with the supervision, quality inspection, design, construction unit to check the base slot positioning line is accurate, whether the pipeline elevation, slope direction meet the design requirements, the soil under the pipe is dense, the water supply and drainage pipe to be suppressed or tested After the water is qualified, it can be backfilled and concealed. The “Hidden Acceptance Record Form” is to be countersigned, and when it is backfilled, it must be stratified to meet the design requirements.

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