Pre-bolt body and large hardness bolts

When the material to be joined is - steel, when taking 01 or 012 steel, the design method of the design is not specified in the specification of the high-strength bolt connection area and the construction precautions; Not indicated, but the construction unit can't do it. It needs to be modified and processed on site. The procedure is troublesome. Some units reflect the design friction coefficient is selected. The main reason is that the design is not combined with the construction unit, and it is not known whether the construction unit has the conditions for sandblasting or shot blasting of the friction contact surface. In the case of no special equipment friction contact surface treatment, when the material to be joined is - steel, the friction coefficient can be taken; when 01 or 012 steel, take the construction unit with the vertical direction of the grinding wheel or use the flame cleaning method to deal with it carefully. After rusting for more than one month, the wire rust is used to remove the floating rust before installation. Generally, the test can meet the requirements. Too high a friction coefficient can cause a lot of trouble.

Alignment of high-strength bolt positions High-strength bolt positions are generally arranged in accordance with the maximum and minimum allowable distances of bolts or rivets provided by the specification. However, the following situations often occur: in the same set of design drawings, the connected members have the same cross section, and belong to the same type of joints, and the positions of the bolts are different, which brings many unnecessary troubles to the factory production. A unified node should be used for design and drafting. In the design of large steel structure, it can not only reduce the workload of drawing, avoid the occurrence of the above unreasonable phenomena, but also simplify the design and improve the standardization of component design and processing. According to the general design, the I-shaped member flange high-strength bolt connection joint may have a number of bolts arranged in the direction of the force direction of the member more than only, and the connecting plate is long. In this way, the bearing capacity of the high-strength bolt is reduced more, and the stress state at the bolt hole at the end of the base material is seriously deteriorated. In this case, the following measures can be taken to reduce the number of bolts: if the joint is a single-sided connection, it can be changed to a double-sided connection.

If the joint bolt is a single line, you can use two rows instead of staggered. If the joint bolts are double rows, you can use a high-strength bolt connection that is larger than the web bolts.

The arrangement of high-strength bolts must be considered to meet the dimensional requirements of the tightening bolt construction tools. In some designs, the minimum clearance required by the wrench when tightening the bolts on site is not checked, especially when using a motorized wrench, which cannot be screwed by the wrench.

I-shaped beam-column web stiffening plate and bolt arrangement I-beam and column design are mostly equipped with stiffening plates on both sides of the web, but the stiffening plate position is often too close to the high-strength bolted joint, giving the site a high strength Bolting of the bolts is inconvenient. When the beam is connected to the elevation, some of the high-strength bolts cannot be screwed with the hand. During the design, the construction unit should be consulted and the position of the stiffener should be arranged reasonably.

When high-strength bolts are used together with welding and high-strength bolts, the construction sequence shall be specified in the design drawings so that the actual stress shared by the weld and high-strength bolts is consistent with the design stress.

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