钢网架结构拼装工艺标准(506-1996)（Standard for assembly of steel grid structures (506-1996)）RangeThe process standard is applicable to the ground assembly of steel grid, bolted spherical joints, welded ball joints and welded steel plate joints.Construction preparation2.1 materials:2.1.1 steel grid assembled steel and connecting materials, high-strength bolts, welding rod and other materials should comply with the design requirements, and should be factory certification.2.1.2 bolt ball, hollow welding ball, auxiliary welding ball, taper head, sleeve, seal plate, net frame member, welded steel plate node and other semi-finished products shall comply with the design requirements and the corresponding national standards.2.1.2.1 steel products used in the manufacture of steel structure space trusses must comply with the design specifications and technical specifications and standards for the corresponding materials. Bolt ball is prohibited from overheating, cracks and hidden dangers. The finished ball must be tested for tensile strength of the largest screw hole. The quality requirements and inspection methods of the bolt ball shall conform to the provisions of table 5-14.Allowable deviation of bolt ball and test method table 5-14The allowable deviation of sub project (mm) inspection methodD = 120, +2.0 -1.0D120 +3.0 -1.5D = 1201.5D120 2.53 bolt ball screw end and the sphere center distance + 0.20 with vernier caliper, height gauge inspection, measuring mandrelOn the same axis two screw D 1200.20Hole end face parallelism D120 0.30The angle between the 5 adjacent two screw holes is equal to 30 . The mandrel, the ruler and the index head are checked by the measuring mandrel0.5%r 6 screw end verticality with the axis of the indicatorNote: R is the end radius of the screw hole.2.1.2.2 assembly of high-strength bolts of steel must comply with design requirements and the corresponding technical standards. High strength bolts for steel grid structures must adopt the national standard steel structure with high strength, six angle bolts, the performance grades 8.8S or 10.9S, and should be checked according to the corresponding grade requirements. Check the factory certificate of high strength bolts, check the test report, and check the reinspection report. The surface hardness test of each high strength bolt shall be carried out before assembly, and cracks and damage shall be strictly prohibited. The allowable deviation and test method of high strength bolts shall conform to the provisions of table 5-15.Allowable deviation of high strength bolt and test method table 5-15The allowable deviation of sub project (mm) inspection methodThe 1 thread length (t +2t 0 Zi Xi?2 bolt length +2t -0.8t3 + 0.2 groove depth with ruler and vernier caliper inspection4 keyway straightness 0.25 position 300 + 2.5 value4 ball roundness D = 300 = 1.5 with caliper and vernier caliper inspection, each ball measuring three pairs, each pair of each otherThe roundness of D300 = 5, the ball 2.5 into 90 degrees, with three of the average diameter difference meter6 of the two hemispheres of the align deviation value is less than or equal to 1 with mold and vernier caliper inspection, each maximum stagger edge point2.1.2.4 steel grid assembly, sealing plate, cone head and sleeve steel must comply with the design requirements and the corresponding technical standards. Sealing plate, cone sleeve, the appearance of crack, wood burning and oxide skin. The quality requirements and inspection methods for the sealing plate, taper head and sleeve shall conform to the provisions of table 5-17.Permissible deviations and test methods for sealing plates, taper heads, sleeves, Tables 5, 7The allowable deviation of sub project (mm) inspection method1 plate, cone head bore +0.5The thickness of the 2 plate and cone head is +0.5 -0.23 sealing plate, cone bottom plate two is parallel to the surface of degree 0.1 with dial indicator, V block check