What are the common problems with steel structure bolt installation

What are the common problems with steel structure bolt installation

Steel structural bolts are connectors of steel frame structures, which can be divided into general bolts and steel structural bolts based on their load-bearing capacity. Below, Ningbo Shengdu Fastener Technology Co., Ltd. will provide a detailed introduction to common problems at the construction site of steel frame structural bolts.

1. Spring washers should be placed according to the design plan for bolt connections under dynamic loads or critical parts, and the spring washers must be set on the side of the nut.

2. The installation of steel structural bolts should be able to penetrate holes freely, and forced penetration is prohibited. The diameter of the thick steel plate connected to the steel structure bolt is slightly larger than the bolt diameter, and it is necessary to take a hole to form it.

3. The timely connection methods of steel structure bolts are generally divided into friction connection, prestressed connection, and pressure bearing connection. Among them, friction connection is the commonly used basic connection method at present.

4. The installation sequence of steel structural bolts: it needs to be carried out from the parts with high bending stiffness to the unrestrained and arbitrary ends. The high-strength bolt at the top of a joint needs to be tightened one by one from the middle of the bolt group to the surrounding areas for initial tightening, re tightening, and final tightening. Each tightening should be marked with a different color of paint to avoid missing tightening.

The initial, secondary, and final tightening of steel structural bolts in the same connector should be carried out within 24 hours. If there is no requirement for a design plan, it is advisable to carry out the construction technology sequence of tightening the steel structure bolts first and then welding them (i.e. bolt first and then welding).