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Specification for quality inspection requirements for steel mesh welding

2024-04-03

The on-site inspection of the steel raw materials used in the steel mesh shall comply with the quality specifications of Article 7-3.-1 of the GB2001 acceptance standard. The variety, specifications and performance of the steel bars used in the steel mesh shall comply with the design requirements and relevant technical standards of the industry. Number of inspections: All construction units and supervision units shall inspect. The production of reinforced mesh should meet the design requirements. Quality inspection quantity: All inspections by the construction unit: The supervision unit shall conduct witness inspections at 10% of the number of random inspections by the construction unit, but at least once. The inspection distance between the grids of the steel mesh should meet the design requirements, and the allowable deviation of the grid size is one centimeter. Upper and lower error, inspection quantity: The construction unit inspects one bundle per batch and randomly samples 20 pieces. Quality inspection method: ruler measurement. The overlapping length of the steel mesh should be 1-2 meshes, which is determined according to the size of the mesh. One large hole can be pressed, and multiple small holes can be pressed. The allowable deviation is about five millimeters. Inspection quantity: The construction unit inspects each batch once and randomly samples a bundle (20 pieces).

Quality inspection method: ruler measurement. The steel bars should be cold drawn and straightened before use. There should be no oil stains, cracks, granular or flaky rust on the surface of the steel mesh. Check whether it has been wet by rain. Quality inspection: The construction unit inspects one bundle for each batch. Check whether the mesh has serious leakage of warp and weft wire diameters. Each piece should not exceed 5. Quality inspection method: when lifting the mesh, let go and then pick it up again. Listen to the sound to see if there is a buzzing sound. If there is leakage, The welding is too serious. The steel mesh should be adapted to the cross-section shape of the tunnel and should be firmly connected to anchor rods or other fixing devices and tied with binding wires.

Quality inspection quantity: The construction unit inspects 20 pieces per batch. The reinforced mesh should be laid and hung after spraying a layer of concrete. When using double-layer steel mesh, the second layer of steel mesh should be laid after the first layer of steel mesh is covered with concrete and the concrete has finally set.

Quality inspection quantity: The construction unit inspects once for each batch.

Quality inspection method: observation, steel ruler measurement.

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