Quality inspection and acceptance of cast-in-place reinforced concrete engineering
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2. The assembly and installation of the formwork must be firm and reliable. The formwork and its support must have sufficient load carrying capacity, rigidity and stability, and the necessary brackets should be properly installed. The arching height of the formwork should meet the design requirements.
3. The strength of the concrete when the bottom mold and the bracket are removed meets the design requirements; the concrete surface and edges are not damaged when the side mold is removed.
4. The allowable deviation of the template assembly and joint width and the corresponding inspection method shall comply with the relevant regulations; the template joint shall not leak slurry; there shall be no debris in the template, the wood form shall be moistened with water, but there shall be no water in the template; The stencil release agent should not contaminate the steel and concrete joints.
5. The embedded parts and reserved holes (holes) fixed on the template shall not be missed, and shall be installed firmly and the deviation shall meet the requirements.
2. The bending of the steel bar and the bending of the end of the bar should meet the requirements of the regulations; the shape and size of the bar processing conform to the design, and the deviation should meet the requirements of the specification.
3. The arrangement of the reinforcing steel joints, the length and manner of the lashing of the steel bars, the bonding quality of the steel bars and the steel mesh, and the welding quality shall comply with the relevant regulations.
4. The allowable deviation and inspection method of the position of the steel bar shall comply with the regulations.
5. Before pouring concrete, the acceptance of steel concealed works shall be carried out, including:
(2) Connection method of steel bars, joint position, number of joints, percentage of joint area, etc.;
(3) The variety, specification, quantity, spacing, etc. of stirrups and transverse reinforcements;
(4) The size, quantity, position, etc. of the embedded parts.
6. When the type, grade or specification of the steel bar needs to be changed, the design change document should be processed.
2. The quality of aggregates, water and admixtures used in concrete works meets quality standards.
3. There should be a special concrete mix design, the design meets the relevant specifications, and the construction mix ratio is determined. The weighing deviation of raw materials does not exceed the specifications.
4. The sum of concrete transportation, flexing and intermittent time shall not exceed the initial setting time of concrete. The upper concrete shall be poured before the initial concrete is initially set. Otherwise, it shall be treated according to the requirements of the construction joint.
5. The concrete strength grade must meet the design requirements; the sample sampling and test methods used to check the strength must comply with the relevant regulations. The concrete structure engineering quality acceptance specification stipulates that the mixing ratio should be no less than one set per 100 discs (not exceeding 100 m 3 ) or every 100 m 3 (once one continuous continuous over 1000 m 3 , not less than one sampling per 200 m 3 ) meter); Queensland 1 ratio on each floor with concrete is not less than a set (L times ((coal mine Lane acceptance of quality 50213-2010 predetermined >> GB, 20 ~ 30m per shaft take a set, roadway, The inclined wells are taken in groups of three to 30m (a group of three). The concrete strength test can also be carried out according to the contract, using non-destructive or partial damage test methods.
6. Covering and moisturizing and curing within 12 hours after concrete pouring, the sprinkling maintenance of Portland cement, ordinary Portland cement and slag cement shall be no less than 7d, mixed with retarding admixture or impervious concrete for not less than 14d. It is not allowed to be stepped on before the concrete strength reaches 1. 2N/mm 2 .
7. After the cast-in-place concrete structure is demolished, there should be no dimensional deviation affecting the structural performance and function. The concrete equipment foundation should not have dimensional deviations affecting the structural performance and equipment installation; the general deviation does not exceed the specification requirements. The appearance quality of the concrete structure should not have serious defects, and the general defects can be technically treated and re-examined for acceptance.
8. The inspection contents of the structural entity include concrete strength, thickness of the protective layer of the steel bar, and contractually agreed items; other items may be inspected as necessary.
9. For the inspection of the thickness of the protective layer of the steel, the method of non-destruction or partial damage may be used, or the non-destructive method may be used and the partial damage method may be used for calibration. The allowable deviation of the thickness of the protective steel layer of the beam-column member is ±5 mm; the plate-like member is ±3 mm; the base Il is::!::10 mm. The qualification rate of all inspection points of the beam and plate members shall not be less than 90%, and there shall be no dimensional deviation exceeding 1.5 times the specified value.