Precautions for bolt connection of steel structure warehouse
How to connect steel structure warehouse bolts: It is assumed that the design of this construction project adopts 10.9-grade friction type high-strength bolts, and there are four models and specifications of M20, M24, M27, and M30. M20 and M24 adopt torsion shear type, M27 and M30 adopt large hexagon head. Here is a detailed explanation of what is to be prepared in advance for the construction of the steel structure warehouse building bolt connection project:
Prepare raw materials and special tools in advance
1. When the steel warehouse structure high-strength bolts are connected to the site, a large number of verification and factory inspection reports are required. After entering the site, 7 sets of them shall be extracted each time for re-testing, and they can be applied after the qualified test.
2. For the bolts that have passed the re-inspection, the original condition of the bolt I must be maintained during storage and transportation. Whether the rigidity will cause the change of the axial force and the coefficient of variation of the bolt connection.
3. During the application period, the bolts, nuts, and washers should ensure that the supporting facilities are not damaged, and the external threads should not be damaged. They should be stored in the warehouse according to the specifications and models, and full-time personnel should be dispatched and purchased.
4. Carry out learning and training on the construction process of high-strength bolts and basic principles of actual operation and electricity safety for the construction team.
5. When using a milling cutter, pay attention that the cutting surface of the hole is not suitable for too deep one time, and the hole should be boring gradually and evenly.
6. The one side of the sand wheel of the angle grinder should be kept vertical with the polished surface.
7. The manual torque wrench is time-consuming for testing. It should be adjusted to the rated torque value beforehand. When using it, listen to the sound warning. When using it, the precision of the wrench should be checked frequently.
8. The electric wrench selects the inner sports jacket according to the diameter of the nut. It needs to be checked and recorded every day before the application.
9. When the special tools are used up, hand them over to a full-time staff to store them and do not store them elsewhere.
1. The friction of the prefabricated components is nothing. According to the experiment, the friction resistance meets the requirements of the design plan. There is no flying off, no pollution, no rust, dry and flattening, and no burrs or burrs on the hole edges.
2. Determine the related matters of the batch of high-strength bolts and special tools according to the retest.
3. When part of the friction surface must be resolved, use a sand wheel to polish the friction surface on the spot. The polishing range is 4 times the diameter of the bolt, and the polishing and supporting directions are vertical.
4. Check whether the position of each prefabricated component is proper and whether the interface is uplifted or deformed.
5. The construction location of the steel structure warehouse has safety protection equipment, and the installation staff shall grasp the professional skills and understand the engineering drawings through training.