Bohai Steel Structure Co., Ltd.

Bohai Steel Structure Co., Ltd.
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    ADD: Longhua Development Zone, Jing County, Hengshui City, Hebei Province

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    author:Bohai Steel Structure Co., Ltd.

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    time:2019-10-11 08:59:42

    2.In-plant processing and manufacturing process specification 2.1 Lofting and blanking requirements 2.1.1 When components need to be spliced due to material specifications limitations, they should first be spliced, butt welding, inspection, rectification qualified, then the overall line marking, numerical control cutting, small material processing according to the size of the parts, and must meet the following requirements 1) All rods should be blanked as far as possible according to the maximum length. At the same time, pay attention to the utilization rate of materials. When the broken head is indicated on the drawing, the construction shall be done according to the drawing; when the broken head is not indicated on the drawing, the broken head must avoid the frame or the edge of the opening more than 200 mm and the splicing position should remain at the place where the internal force is small, that is, the broken head should avoid the middle L/3 part of the component length L. The splicing plate length shall not be less than 2 times the width of the plate, and shall not be less than 600 mm 2.1.2 when the thickness is different. When the difference of splicing steel plates is more than 4 mm, the slope ratio should be less than 1:4. At the same time, if there is no transition section after the slope opening, it should be considered separately to ensure that there is a transition section 2.1.3 welded H-shaped column/beam/support after the slope opening. If it needs to be joined, the joint form of its surface and web should be ladder-shaped butt joint. Face and web joints shall not be in the same cross section, they shall be staggered over 200 mm, and shall avoid the installation position line of the stiffening plate on them, and avoid the addition of machining allowance of 2.1.4 small holes. (1) Holes larger than 80 mm in diameter need to be bored, and when lofting, the drawing line should be reduced by 8 mm in diameter, which is made by wind cutting or drilling; the 8mm shall be sent to the boring hole as allowance. Drawing dimensions.

    (excluding holes with lower accuracy such as grouting holes and air permeability holes). (2) Holes with diameter less than 80mm can be drilled directly except that the accuracy of the holes should be specified by the process; (3) holes with lower accuracy can be cut directly; (e.g. grouting holes/air permeability holes). (4) Equipment holes on the arch-lifting steel girder are made by the workshop. Equipment holes on arch steel girders can be directly opened when laying out and cutting materials. 5) When materials need to be replaced, 2.2 margin can be replaced by 2.2 margin addition (1) 2 mm welding shrinkage margin should be added to each butt joint (2) Full fusion length of all steel columns, beams, supports and corbels should be increased by 50 mm 2.2.2 at both ends of the components, if H is jointed together. The welding shrinkage allowance of steel, box steel and other components in their length direction should be 2.2.3 as required. In addition, due to the stiffening plate (connection plate) at the steel column, steel beam, support and bracket, as well as pin welding, the welding allowance should also be added as required.

    2.24 If these parts are made up of rolled H steel, the welding shrinkage allowance of 2.2 self-shaped steel columns and beams should be added in the length direction to the stiffening plate (connecting plate) and brackets on it, and the milling allowance of 8 mm ends should be placed at the upper and lower ends of the length direction. 2.2.6T-shaped beams, supports and brackets: The row parts of T200*400*13*21 are cut by rolling H-shaped steel without splicing and forming T-shaped beams and braces of this specification: 30 mm of spark correction margin is added to the length direction of blanking; 10 mm of spark correction margin is added to the length direction of blanking; 2.2.7 arched steel beams are added to the length direction of blanking. 1) The arch initiation of steel beams is carried out according to the arch initiation value indicated in the design drawing. (2) The allowance of arch initiation is set up when the spliced H-section steel beams and rolled H-section steel beams are laid out and blanked, and more than 30 mm is added at each end of the steel beams.

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