Key points for quality inspection of mine roadway support engineering

        1. Concrete and steel construction involved in concrete and reinforced concrete engineering of mine roadway engineering, inspection and acceptance requirements for raw materials (including admixtures, welding rods, etc.) and concrete strength of construction, and "Construction quality acceptance specification for concrete structure engineering" >> GB 50204-2015 and other corresponding specifications are basically the same.
        2. The template of concrete and reinforced concrete engineering of mine roadway engineering should be designed. The template should be accepted before use. After installation and construction, attention should be paid to observation and maintenance to ensure good use. The material, specification and rigidity of the template shall comply with the design and specification requirements. The template produced by the manufacturer shall have the certificate and the specification, and shall be assembled and verified before use; the non-shaped template designed and processed by itself shall be assembled, debugged and tested before leaving the factory, and organized by the supervision, construction, construction and processing units. Acceptance; templates that have been re-used after overhaul or plastic surgery should also be examined by the above test methods. The specification deviation after the assembly of the template should meet the requirements of the specification.
        3. r. The dimensional deviation of the section specifications, thickness specifications and steel layout specifications of the Kunming soil support shall comply with the requirements of the acceptance specification. The backfill material of the wall shall meet the design requirements, and the filling of the shaft wall shall be dense, and the filling of the roadway shall have no obvious empty roof. Empty help phenomenon.
        4. Waterproof and anti-seepage concrete should meet the requirements of design and corresponding national regulations.

        1. Key points for acceptance of anchor and anchor support engineering
        (1) The material, variety, specification and strength of the rod body and fittings of the anchor rod, the material, specification, proportion and performance of the cement coil, resin coil and mortar anchoring material, as well as the anchor cable material, specification, bearing capacity and anchor cable. Anchoring materials, anchoring methods, etc. must meet the design requirements.
        (2) The installation quality of the bolt requires a firm installation, and the pallet is close to the wall and is not loose. The tightening torque of the anchor should not be less than 100N. m. Each mine shaft for acceptance of different pullout resistance of the qualified inspection requirements, coal mine bolt inspection requirements (including resin bolt, bolt rapid hardening cement, high early strength cement mortar anchor) pullout resistance the lowest value of not less than 90% of the design value; ore of non-ferrous metals and the friction anchoring end anchored type bolt pullout force required batch of test pieces with an average value of not less than the design value, and its minimum value is not less than 90 design %; For the full-length bonded anchor (mortar anchor bolt), the mortar compactness should be checked, and the grouting compactness should be greater than 75%.
The prestress of the anchor cable after locking is not less than 90% of the design value.
        (3) The allowable deviation of the anchor hole depth should be 0~50mm, and the effective depth of the anchor cable installation should not be 95% of the small design. The spacing between the bolt installation, the row spacing, the contour of the well lane or the bedding plane, the joint surface, etc., and the deflection angle of the anchoring direction of the anchor cable and the design direction shall meet the specified deviation requirements.
        2. Checkpoints for inspection and acceptance of shotcrete support engineering
        (1) The quality of cement, water, aggregate and admixture used for shotcrete shall meet the requirements of construction organization design; the concrete mix ratio and admixture dosage shall comply with the corresponding national standards.
        (2) The thickness of the shotcrete should not be less than 90% of the design value.
        (3) The surface flatness of the shotcrete is not more than 50mm; the foundation depth is not less than 90% of the design value.

        1. The reinforced concrete precast arc plate shall be inspected according to the provisions of GB 50204-2015, the material, strength and specification of concrete precast block and stone, and the type of mortar and the wall behind the prefabricated arc plate. The quality of the filling material must meet the design requirements.
        2. The backfilling of the masonry wall must be strict, and there is no empty headspace.
        3. The mortar strength used for masonry must meet the following requirements:
        (1) The average compressive strength of the same batch of mortar test blocks must be greater than or equal to the design value.
        (2) The minimum average value of the compressive strength of the same batch of mortar test blocks is strictly less than 85% of the design value.
        4. The allowable deviation of the prefabricated arc plate joint and the thickness of the masonry should meet the requirements of the specification.

        1. The components and accessories of various brackets are complete. The materials and specifications of the brackets and components and the backboard and filling materials must meet the design requirements.
        2. The bracket column is dug to the solid bottom, and the bottom beam should be laid on the solid bottom, and its depth should not be less than 30mm of the design value. Special measures should be taken when the stud or sill cannot fall on the solid foundation.
        3. The allowable deviation of the erection position of the bracket, the allowable deviation of the forward and backward tilt of the horizontal roadway, and the deviation of the yaw angle of the inclined roadway bracket shall comply with the specifications.
        4. The erection of the brackets is in compliance with the regulations. The erection deviations of the bracket beam level, torque, bracket spacing, column inclination, and stud beam interface misalignment shall comply with the specifications.