Key Points of Winter Construction for Steel Structure Manufacturers

Update time : 2023-01-31 13:09:32

1 inter transport, box to make steel, steel structure manufacturers should take anti-skid measures. The line accumulation place should be smooth and firm. There has never been a puddle, and the road surface is not frozen. When the prefabricated components of the same model and specification are stacked, the prefabricated components should be kept level, the backing plate should be on the same vertical line, and the prefabricated components should be avoided from slipping.

2. Before steel structure assembly, in addition to safety inspection in accordance with the requirements of normal temperature, the quality of prefabricated components should be systematically reinspected according to the requirements of negative temperature. If the deformation of prefabricated components caused by missing inspection of transportation and accumulation in the production process, and the error exceeds the requirements and endangers the assembly quality, maintenance and correction shall be carried out on the ground, and hoisting and assembly shall be completed in accordance with the design and specifications.

3. For steel structure manufacturers, when the steel cables used for binding and hoisting steel components are in contact with the prefabricated components under negative temperature, the ground anti-slip spacer shall be added. Therefore, the joint plate, the hanging ladder used by the installation worker and the jig used for calibration, which are hoisted at the same time with the prefabricated member, should be tied up firmly with rope. When hoisting prefabricated components directly with hooks and bolts, check whether the hooks and bolts are welded for damage.

4. When assembling prefabricated components at negative temperature, data charts of assembly sequence of steel components shall be prepared according to temperature standards, and assembly shall be arranged in the prescribed sequence during construction. The plane should be assembled gradually from the building core to the periphery, and the vertical surface should be assembled from the bottom piece by piece to the top.

5, steel structure installation welding work should be developed welding methods. In each section of the column layer of prefabricated component assembly, calibration, bolted and embedded welding expansion amount, the plane domestic demand from the structural core gradually symmetrical expansion of electric welding welding around, not from the structure of the outside to the core welding, both sides of the component can not be synchronized welding.

6. If there is snow, freezing or condensation on the prefabricated member, it shall be cleaned before construction, and the coating shall not be harmed.

7. The special machine used for assembling steel structures at negative temperature should be tested in accordance with the provisions of negative temperature.

8. Calibration should be carried out first when assembling columns, bearing beams, support points and other major prefabricated components under negative temperature, and should be carried out first after proper location calibration. The installation of prefabricated components on the same day should produce a stable indoor space management system.

9. In the installation of high-strength bolt connection head, the friction surface of the component should be clean, without snow, freezing, sun and rain, touching soil, oil stains and other dirty.

10. In the installation of double-layer steel structure, the bearing capacity accumulated on the floor should be limited. The quality of live load, snow and freezing in engineering construction shall not exceed the bearing capacity of steel column and floor plate (pressure plate).

11. Before welding, welding current, welding mode and other major parameters should be measured according to the size of negative temperature coefficient.

12. In addition to conforming to the current industrial standards, the installation quality of steel structure under negative temperature should also be accepted according to the customized standards.

13. In the installation process of steel structure in low temperature environment, screw connection should be used when it is temporarily fixed or accessed; When temporary electric welding on the spot, it is necessary to deal with the temporary welding in time after installation.

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