1 door frame combination, you should check all scantlings and assembly number, a combination of various joint surfaces to clean up the web, local deformation process to ensure the quality of the door frame combinations.
2 pairs of upper and lower sub-beams, side beams and girders, should as far as possible on the ground combined platform combined into a whole, reducing the high-altitude operations, and pull the wire line method to measure the non-straightness, should not exceed ± 2.0mm.
3 When measured with a pull wire line or horizontal main beam arch, to fix the weight deflection of steel wire, steel wire diameter, tension force, the distance should be consistent with the relevant requirements.
4 If using bolts or high-strength bolted connections shall comply with the relevant provisions of the construction.
5 bridge gantry crane gantry hoisting applications wind cable taut rope and fix and adjust. The door is not in any direction perpendicular to the legs of not more than 5.0 mm. Door leg span of not more than ± 5.0mm, diagonally opposite is not more than 5.0 mm, the relative difference in elevation is less than the top 3.0 mm.
6 When the legs meet the requirements, before lifting platform or on the main beam, and the track level as the basis to mow platform and gate leg joints, the platform or the main beam level. And check:
1) main beam center and trolley track deviation is less than 3.0 mm;
2) Mast center deviation is less than 5.0 mm;
3) diagonally opposite the upper structure is not more than 5.0 mm.
7 upper structure or main beam and door legs connected by welding, soldering should pay attention to altitude, weather, wind direction, wind and take appropriate action.
8 weld oxide should be cleaned, where the gap is too large to allow surfacing flesh, peppered steel or other materials is strictly prohibited. Place before welding groove within 100 mm should be heated, surrounded by objects should be set up wind, slowing the cooling rate of the weld, to improve the microstructure.
9 overhead gantry crane four joints should also welding, welding should be used Multipass welding reduce stress and shrinkage deformation after welding, weld inspection shall comply with the relevant provisions, without request, reference may be incomplete penetration joints shall not exceed 15% of the base material, the maximum does not exceed 3.0 mm requirement.
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