1 Introduction 2 Acceptance criteria 3 Acceptance system 4 Relevant specifications 5 Relevant responsibilities 6 Precautions
brief introduction
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Acceptance of concealed works refers to the inspection and acceptance of sub-projects and sub-projects that will be closed by the next process during the construction of houses or structures. Generally including water supply and drainage engineering, electrical pipeline engineering, waterproof engineering, etc. Because concealed works will be covered again if there are quality problems after concealment, which will cause heavy losses such as rework, so the acceptance of concealed works must be done well. Construction drawings (5 sheets)
Acceptance criteria: 1. Circuit quality acceptance standard 1, strong and weak current shall be laid and threaded separately, and there is no joint or kink in the conduit, and the joint is in the junction box. If wiring is required, a junction box must be used. Wire connection is firm, wiring is not subject to tension, binding is firm, and wire core is not exposed. Second, the waterway quality acceptance standard 1, pipeline installation should be horizontal and vertical, close to the wall, the top surface, laid firmly, without shaking, every 800mm plus 1 fixed card or 1 boom. [1] Acceptance system: In order to further strengthen the project quality management, avoid the quality hidden dangers caused by concealed works, and ensure the project quality meets the design and specification requirements, the concealed works acceptance system is specially formulated. 1. Acceptance personnel: the person in charge of the engineering department, the personnel of the supervision company, the construction personnel of the construction unit and the quality inspectors. Second, the acceptance time: the concealed works should be submitted for inspection one day in advance. Three. Acceptance content: all concealed works in civil engineering, bridge engineering and culvert engineering. Four. Acceptance procedures and regulations: 1. After the concealed works pass the self-inspection, notify the supervisor and the project leader in writing, and indicate the acceptance time and content. 2. Acceptance of concealed works must be attended by project leaders, supervisors, builders of construction units and construction teams. * * * acceptance, if necessary, to have the next project construction team to participate in. 3. The basement, foundation trench and pile foundation engineering should be attended by the relevant person in charge of the survey unit, design unit and relevant testing unit. 4. After the acceptance of concealed works, the construction unit can proceed to the next procedure only after the supervisor and the project director sign the acceptance record of concealed works. 5, concealed engineering acceptance is unqualified, must be re-acceptance after rectification, qualified rear can sign the concealed engineering acceptance record, allowing the construction of the next procedure. 6, masonry reinforcement engineering by supervision personnel or in charge of daily inspection personnel spot check acceptance. 7. Take cover engineering acceptance is unqualified, must be rectified within a time limit. If it is not rectified in time, the construction unit will be warned or punished in accordance with the Relevant Rules for Rewards and Punishment. V. Acceptance Procedure for Concealed Works Concealed works must be accepted before the start of the next working procedure, and shall be handled according to the Acceptance Control Procedure for Concealed Works. Specifically, it includes: 1, foundation pit and foundation trench. 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 on-site confirmation as soon as possible whether the soil meets the bearing capacity requirements. If further treatment is needed, it can be signed by the designer through the Engineering Contact Sheet. The acceptance record of foundation pit or foundation trench shall be countersigned by the above five parties, and shall be hidden as soon as possible after acceptance to avoid being soaked by rain.
2. Concealed acceptance of foundation backfill The foundation backfill project should be compacted by layers according to the soil or materials required by the design drawings, and according to the requirements of construction and acceptance specifications, the quality supervision station should be invited to take soil to check its compactness, and the compaction coefficient should meet the design requirements. Ensure that the backfill soil does not produce large settlement. 3. Before the concealed acceptance (1) of reinforcement in concrete engineering, check whether there is a certificate of conformity, that is, the specification, model, furnace number, batch number, quantity, production date and manufacturer of reinforcement shall be indicated on the certificate of conformity. At the same time, samples should be taken for physical properties and chemical composition inspection, and qualified samples can enter the site in batches. (2) Check whether the specification, quantity and spacing of steel bar binding meet the requirements of design drawings, and the number of joints and lap length of the same section must meet the requirements of specifications. For the steel bars of welded joints, the welding quality of welders should be inspected first, and then the welding specimens should be sampled according to the requirements of specifications. Unqualified welding specimens should be sampled twice as required to ensure the quality of welded joints is qualified. (3) The reinforced protective layer shall be checked and accepted according to the design requirements. (4) If there is any disqualification in the acceptance, a supervision rectification notice shall be issued, and only after it is completely qualified can it sign the concealed acceptance record. 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 check whether the bushing and iron parts meet the design requirements by increasing material specifications and processing; Thirdly, check whether the specific positions such as elevation and axis are accurate; And check whether its fixing method is reliable, and whether it can ensure no deformation or displacement during concrete pouring. 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. 5. Concealed acceptance of concrete structures and masonry works before decoration; The concealed intermediate acceptance of concrete structure and masonry should be carried out before decorative plastering; All material certificates and concrete pressure test reports shall be checked for concrete structures; On-site strength rebound or drilling sampling pressure test should be carried out; Check whether the surface compactness and structural geometry of concrete meet the design requirements. Masonry should check whether the raw material certificate, mortar mixture ratio, mortar pressure test report and other related materials are complete, and on-site check whether the setting of Rachel reinforcement of seismic structure is appropriate, whether the masonry method and mortar joint meet the design requirements, and whether the axis, position and thickness of masonry meet the requirements of drawings. The main personnel participating in the acceptance are engineers from the Engineering Department, engineers from the Municipal Quality Supervision and Inspection Station, supervision engineers, representatives from design units and construction units. Fill in the Hidden Acceptance Record Form after acceptance and sign it by * * * *. If there are problems in the acceptance, a Notice of Supervision and Rectification will be issued to rectify within a time limit. After the rectification is qualified, the above-mentioned personnel shall be organized for re-inspection, and the concealed construction of decorative plastering can be carried out only after the re-inspection is qualified. [2] Relevant specifications 1. General provisions 1. Before the basement construction, it must complete the acceptance and handover procedures with the qualified plumbing, ventilation, electrical and other projects. 2. The variety, specification, quality, molding size, structure and fixing method of the materials selected for foundation engineering must meet the design requirements and current material standards.
Second, the suspended ceiling basement project is suitable for all kinds of metal decorative boards, paper plasterboards, wooden boards, mineral wool sound-absorbing boards, glass wool board, lattice and glass decorative boards. [1] Related responsibilities: due to 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 and concealed, the contractor should first conduct self-inspection. After passing the self-inspection, the owner or the site representative stationed by the owner shall be informed in time to check the concealed works, and participate in the operation of the concealed works before the concealed works are concealed. 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. If the Employer fails to check the concealed works on schedule after receiving the notice, the Contractor shall urge the Employer to check within a reasonable period of time. Because the employer does not carry out inspection, the contractor cannot carry out concealed construction, so if the contractor notifies the employer to carry out inspection, and the employer fails to carry out inspection in time, the contractor has the right to suspend construction. The contractor may postpone the construction period and require the employer to compensate for the losses caused by shutdown, slowdown and overstock of materials and components. Where the contractor carries out concealed works without notifying the Employer for inspection, the Employer has the right to require the concealed works to be inspected afterwards, and the contractor shall peel off the exposed works as required, and re-conceal them after inspection or repair them. If the concealed works do not meet the requirements after inspection, the contractor shall rework and re-conceal. In this case, check the expenses incurred by concealed works, such as inspection fees, rework fees, materials fees, etc. , shall be borne by the contractor, the contractor shall also bear the liability for breach of contract caused by the delay in the construction period. [1] Note: 1. Water supply and drainage projects will be phased out, because galvanized pipes are easy to rust and scale, and will freeze and crack if they are not insulated. At present, the most widely used are aluminum-plastic composite pipes, plastic steel pipes and PPR pipes. These pipes have good plasticity and toughness, and do not crack and scale when they are kept warm. They use special copper joints or thermoplastic joints to ensure quality and consume less energy. 2. The power cord of electrical pipeline engineering is generally divided into hard wire, soft wire and sheath line, and it is divided into 1 mm2 wire, 1.5 mm2 wire and 2.5 mm2 wire according to the thickness of copper core. For safety and convenience of maintenance, the power cord should be sheathed. In addition, audio lines and signal lines are also commonly used. Sockets are divided into 10A, 15A, etc. There are also many brands and many fakes. Inferior sockets are easy to cause accidents, so it is recommended to buy them in regular electrical stores. Electrical wiring engineering requires construction specifications, and workers should hold relevant certificates to ensure safety and eliminate hidden dangers. Floor base
There are two methods for solid wood floor base: one is to brush cold primer on cement floor, lay wooden keel, and finally nail the floor; Another method is to lay a layer of joinery board or rough floor on the keel first, and then nail the floor. Through this method, the floor is evenly stressed and the structure is firm. The composite floor is easy to install, and there are two ways to do it at the grass-roots level: one is to make a leveling layer first, then lay a PVC cushion, and then lay the composite floor; The other is to lay wooden keel and rough floor on cement leveling layer, and then lay composite floor. 4. The retaining wall base has flat plate and concave-convex panel. Practice is to brush a layer of cold priming oil on the wall first, then install 30mm*40mm wooden keel, on this basis, nail multilayer board or joinery board, and finally nail veneer plywood. In order to prevent mildew, a series of courage holes with a diameter of 6mm were opened in the upper part of the wallboard. 5, doors and windows cover at the grass-roots level with keel first, and then nail joinery board or density board, surface with veneer plywood nail wood line. Please note that MDF is expected to be soaked in water to avoid future expansion. 6. The ceiling materials of the ceiling base include gypsum board, grey board, plywood, aluminum alloy gusset plate, plastic gusset plate, frosted glass, stained glass, etc. Keels are divided into wooden keels and light steel keels. The phenomenon of cracks in the ceiling often occurs, such as filling the joints with elastic putty and sticking nylon belts, which can improve this situation. After the concealed work is completed, it needs to be checked and accepted to ensure that there are no hidden dangers, and the subsequent construction can only be carried out after it is qualified. Otherwise, if problems are found in the future and need to be reworked, it will not only affect the quality, but also delay the construction period. Both the owner and the contractor will suffer losses.