Method for filling out acceptance records for concealed works

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Methods for filling out acceptance records for concealed works I. Foundation and main structure works 1. Earthwork (1) Inspection items: Check the base elevation, dimensions of the foundation base, etc., in accordance with the construction drawings, geological survey reports, and relevant construction acceptance standards； Check the condition of base cleaning, the base elevation, and the dimensions of the base outline ； (2) Key points for filling in: The record of hidden inspections for earthwork projects should indicate the number of the construction drawings and the number of the geological survey report, and the contents of the inspections should be described clearly. 2. Support works (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the foundation pit support plan and technical instructions, inspect the type, specifications, quantity, insertion length, drilling diameter, depth, and angle of the anchor rods and soil nails ； Check the width, depth, and inclination of the diaphragm wall trench, as well as the specifications and position of the rebar cage, the cleanliness of the trench bottom, and the thickness of the sediment ； (2) Key points for filling in: The records of hidden inspections for support works should indicate the number of the construction drawings and the number of the geological survey reports. It is also necessary to clearly describe key data such as the type and specifications, quantity, insertion length, and drilling diameter of the anchor rods and soil nails. 3. Pile foundation works (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the pile foundation construction plan and technical instructions, inspect the specifications and dimensions of the rebar cage, the thickness of the sediment layer, and the condition of the hole cleaning ； (2) Key points for filling in: The record of hidden inspections for pile foundation projects should include the number of the construction drawings and the number of the geological survey report. It is also necessary to clearly describe the specifications and dimensions of the rebar used, the thickness of the sediment, and the conditions regarding hole cleaning. 4. Underground waterproofing works (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the waterproofing construction plan and technical instructions, inspect the layout and structure of concrete expansion joints, construction joints, post-cast strips, wall-penetrating sleeves, embedded components, etc ； Check the base treatment of the waterproof layer, as well as the specifications, thickness, laying method of the waterproof materials, handling of internal and external corners, and overlap sealing ； (2) Key points for filling in: The records of hidden inspections for underground waterproofing projects should specify the number of the construction drawings, the strength grade and water resistance grade of the rigid waterproof concrete, as well as the number and specifications of the flexible waterproof materials. It is also necessary to include the number of the retest reports for these waterproof materials, the methods used for their installation, the overlap length, and width dimensions. In addition, details regarding the treatment of internal and external corners and any additional layers should be clearly described; if necessary, simple diagrams can be attached to provide further clarification. 5. Binding of structural reinforcement bars: (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the reinforcement bar construction plan and technical instructions, inspect the type, specification, quantity, position of the reinforcement bars, as well as the locations of anchorage and joints; check the lap length and thickness of the protective layer, as well as the condition of the reinforcement bars and spacers, and whether the bars have been rust-removed ； (2) Key points for filling in: The record of hidden inspections for rebar work should include the number of the construction drawings, the numbers of the test reports for the main rebar materials, the types, spacing, and cover thickness of the rebar both vertically and horizontally, the type and spacing of the stirrups, the length of the rebar binding joints, as well as the specifications of the spacers. If the specifications of the rebar do not match those specified in the drawings, the negotiation number related to the substitution of the rebar should also be indicated clearly. The inspection details should be described as thoroughly as possible. 6. Connection of structural reinforcement bars (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the reinforcement bar construction plan and technical instructions, inspect the connection method, type of connection, location and quantity of joints, as well as the quality of these connections. In the case of welding, it is also necessary to check the quality of the electrodes and flux, as well as the shape of the welds, their length and thickness, and the condition of the surface after welding ； (2) Key points for filling in: The record of hidden inspection for steel bar connections should indicate the number of the construction drawings, the number of the steel bar connection test report, as well as the type of connection (welding, mechanical connection). The form of connection (tapered thread connection, rolled straight thread connection, steel sleeve connection, ribbed straight thread connection, electroslag pressure welding, flash butt welding, etc.) should also be specified. The specific specifications, quantities, and locations of the joints must be clearly described; separate records of hidden inspection should be prepared for each different form of connection. 7. Prestressed engineering: (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the prestressing construction plan and technical instructions, inspect the type, specifications, quantity, and location of the prestressed tendons; the specifications, quantity, location, and shape of the reserved ducts, as well as the condition of the grouting holes and venting/drainage pipes. Also examine the cutting length of the prestressed tendons, the method of cutting them, the vertical position deviation, the method of fixing them, and the integrity of the protective covers. Additionally, check the assembly of anchors, clamps, and connectors, as well as the reinforcement measures in the anchorage area. (2) Key points to fill in: In the hidden works inspection record for prestressed construction, it is necessary to indicate the number of the construction drawings, the type of prestressing (bonded or unbonded), the method of prestressing (pretensioning or post-tensioning), the specifications and model of the anchorages, the length dimensions of the prestressing tendons, the dimensions of the embedded plates, etc. The contents of the inspection should be described clearly. 8. Steel structure (truss) engineering: (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the construction plan and technical instructions, inspect the specifications, location, installation method, and tightening degree of the foundation bolts ； Number of coats of paint on the substrate to be coated with fireproof paint and coating thickness ； Connection methods and quality of welded ball joints in grid structures ； The location of the grid support bolts, the types of shimming blocks, and the tightening condition of the bolts, etc ； (2) Key points for filling in: The records of hidden inspections for steel structure (truss) projects should indicate the number of the construction drawings, the model and specifications of the main materials, as well as the numbers of the retest reports for these raw materials. The contents of the inspections must be described in detail. 9. Construction details for interior (exterior) insulation of exterior walls: (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the construction plan and technical instructions, inspect the connection methods of the structural joints and other related aspects ； (2) Key points for filling in: The inspection record should indicate the construction drawing number, the type and specifications of the insulation material, as well as its thickness; a schematic diagram of the joints connecting to the exterior wall panels can also be attached. Describe the contents of the inspection clearly. II. Building Decoration and Finishing Works 1. Floor Works (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, construction plans, and technical instructions, inspect the material type, specifications, laying thickness, laying method, slope, elevation, surface condition, and sealing treatment at joints of each base layer (underlayment, leveling layer, isolation layer, filling layer) ； (2) Key points for filling in: The records of hidden inspections for floor works should indicate the number of the construction drawings, the type of flooring (stone flooring, wooden flooring, cement flooring, panel flooring), as well as the variety and specifications of the materials, and clearly describe the contents of the inspections. 2. Waterproofing for toilets and bathrooms: (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the construction plan and technical instructions, check the moisture content of the substrate surface, the condition of floor drains, sleeves, the areas around sanitary fixtures, and corners; also inspect the application of the waterproof coating on the walls. (2) Key points for filling in: The record of hidden inspections for bathroom and toilet waterproofing should specify the number of the construction drawings, the number of the retest reports for the waterproofing materials, the type of waterproofing materials and the thickness of the coating applied, the overlap width of the glass fiber cloth, the situation regarding additional layers at the base of floor drains, sleeves, and sanitary fixtures, as well as the height to which the waterproofing layer extends from the floor to the walls. The details of the inspections must be described clearly. 3. Plastering work (1) Inspection contents: Based on the construction drawings, relevant construction acceptance specifications, as well as the construction plan and technical instructions, inspect the material specifications, fixing methods, and overlapping conditions of materials that require reinforcement measures ； (2) Key points for filling in: The record of hidden inspection for plastering work should indicate the number of the construction drawings and the number of the cement retesting report. It is necessary to describe in detail the reinforcement measures taken to prevent cracking at the surfaces where different materials meet. 4. Door and window works (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, construction plans, and technical instructions, inspect the quantity, position, spacing, and installation method of embedded parts and anchors, bolts, etc.; as well as the connection method with the frames, anti-corrosion treatment, filling of gaps, and adhesion of sealing materials ； (2) Key points for filling in: The records of hidden inspections for door and window projects should indicate the number of the construction drawings, the type of doors and windows (wooden doors and windows, aluminum alloy doors and windows, plastic doors and windows, glass doors, metal doors, fire-resistant doors), the locations of embedded parts and anchors. For wooden doors and windows, it is necessary to specify the anti-corrosion treatment applied to the wooden bricks used in embedding, as well as the materials used to fill gaps between them and the wall, along with any insulation materials used ； The location of embedded parts in metal doors and windows, the methods of embedding them, and the sealing treatments, etc ； The wall thickness of the steel reinforcement used in plastic doors and windows should be clearly specified, as well as the number of door and window frames, secondary frames, sashes, and mounting plates or expansion bolts ； Fire and corrosion protection treatments for special doors and windows, as well as the methods of connecting them to the frames. 5. Ceiling installation project: (1) Inspection items: Based on the secondary design construction drawings, relevant construction acceptance standards, construction plans, and technical instructions, inspect the material, specifications, spacing of ceiling joists, methods of connection and fixation, surface fire and corrosion protection treatments, the visual quality of the ceiling materials, as well as the condition of joints and corners ； (2) Key points for filling in: The records of hidden inspections for ceiling installation should specify the number of the construction drawings, the number of the negotiation records, the type of ceiling (exposed keel ceiling or concealed keel ceiling), the type of framework used (light steel keels, aluminum alloy keels, wooden keels, etc.), the types of ceiling materials (gypsum boards, metal sheets, mineral wool boards, plastic sheets, glass sheets), the specifications of these materials, as well as the material and specifications of the hangers and keels, their installation spacing and connection methods. Information on the anti-corrosion treatment applied to metal hangers and keels, and the anti-corrosion and fire-resistant treatments for wooden keels, should also be clearly stated. Inspections of various pipes and equipment installed in the ceiling, as well as water pressure tests for the plumbing system, should also be described in detail. 6. Light partition wall project: (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, construction plans, and technical instructions, inspect the location and quantity of embedded parts, connectors, and tie rods, as well as their connection methods; check the connection to surrounding walls and ceilings, the connection of the joists, the spacing between them, the fire and corrosion protection measures, and the use of filling materials ； (2) Key points for filling in: The record of hidden inspection for lightweight partition wall projects should indicate the number of the construction drawings, the type of lightweight partition wall (panel partition wall, framework partition wall, movable partition wall, glass partition wall), the type of panels used (composite lightweight partition panels, gypsum hollow panels, precast or cast-in-place wire mesh cement panels, etc.), as well as the specifications and models. The location and connection methods of embedded parts and connectors must also be clearly described. 7. Cladding panel (tile) works
(1) Inspection items: Based on the construction drawings from the secondary design, relevant construction and acceptance specifications, as well as the construction plan and technical instructions, inspect the specifications, quantity, location, connection methods, anti-corrosion treatment, and fire protection measures of embedded parts (post-installed embedded parts) and connectors. For areas requiring waterproofing, also check the construction methods for the waterproof layer and leveling layer ； (2) Key points for filling in: The record of hidden inspections for the cladding (brick) work should specify the number of the construction drawings, the types of materials used for the cladding (stone, wooden decorative walls, soft-covered walls, metal panel walls), the specifications of the panels, and the spacing between the studs. The contents of the inspections should be described in detail. 8. Detailed work (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the construction plan and technical instructions, check the quantity, specifications, location, etc. of embedded parts or parts installed later ； Grating frames made of square timber, anti-corrosion treatment, rust prevention for screws, and so on ； (2) Key points for filling in: The records of hidden inspections for detailed works should indicate the number of the construction drawings, the type of materials, and whether there are any special requirements ； Describe in detail the inspection items regarding the quantity, specifications, location, and connection methods of the embedded parts used for installing guardrail handrails, cabinets, curtain boxes, window sills, etc. 9. Curtain wall project: (1) Inspection items: Based on the secondary design construction drawings, relevant construction acceptance standards, as well as the construction plan and technical instructions, inspect the installation of the connection joints between the components and the main structure ； Installation of joints around the curtain wall, as well as between the curtain wall surface and the main structure ； Installation of expansion joints, settlement joints, seismic joints in curtain walls, as well as wall corner connections ； Installation of lightning protection and grounding connections for curtain walls, etc ； (2) Key points for filling in: The records of hidden inspections for curtain wall projects should indicate the number of the construction drawings, the type of curtain wall (glass curtain wall, metal curtain wall, stone curtain wall), the specifications and models of the main materials, the exact locations of the embedded components, as well as the installation details and anti-corrosion treatments for the connections between the main structure and the columns, and between the columns and the beams ； Describe in detail the inspection items, such as the location of lightning protection nodes, as well as the conditions regarding fire prevention, water resistance, and insulation. III. Building Roofing Works 1. Roof Details (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, construction plans, and technical instructions, inspect the condition of the roof substrate, leveling layer, and insulation layer; as well as the type, specifications, thickness of materials, method of installation, additional layers, details at gutters, flashings, and expansion joints, and the treatment of sealing areas ； (2) Key points for filling in: The record of detailed inspections of the roof should include the number of the construction drawings, information on the roof substrate, the slope of the leveling layer, as well as the thickness and specifications of the insulation material; the contents of the inspection must be described in detail. 2. Roof waterproofing: (1) Inspection items: Based on the construction drawings, relevant construction acceptance standards, as well as the construction plan and technical instructions, inspect aspects such as the moisture content of the base layer, the type, specifications, thickness of the waterproofing material, and the method of installation ； (2) Key points for filling in: The record of hidden inspections for roof waterproofing should indicate the number of the construction drawings, the retesting number of the waterproofing materials, as well as the type, specifications, and models of these materials. It is also necessary to specify the overlap length of the waterproofing membranes and the offset dimensions between the upper and lower layers. Descriptions of the treatment applied to additional layers, detailed areas, and sealing points should also be provided clearly. IV. Some examples: http://img.civilcn.com/d/file/zhishi/gcgl/2020-01-13/edfa74728a7972d338614e6908b4afdd.jpg http://img.civilcn.com/d/file/zhishi/gcgl/2020-01-13/27e705c993f76064f14fafb7b6b7a32e.jpg