What is the standard and acceptance for installing steel structure bolts?
Release Time:
2022-10-21
Steel structure bolts play a linking role in machinery. Bolts are needed in many places to fix, so what are the standards and acceptance for installing steel structure bolts? Please take a look with the editor of Xinmo Fasteners. What is the standard and acceptance for installing steel structure bolts? 1. Hit the high-strength bolts with a 0.3kg hand hammer for census to check whether there is any leakage; the tightening of the high-strength bolts with large hexagon heads should be divided into initial and final screwing; the tightening of torsion shear type high-strength bolts should be divided into initial screwing and final screwing. For large nodes, it should be divided into initial screwing, re-screwing, and final screwing, and the re-screwing torque is equal to the initial screwing torque.
Steel structure bolts play a linking role in machinery. Bolts are needed in many places to fix, so what are the standards and acceptance for installing steel structure bolts? Please take a look with the editor of Xinmo Fasteners.
What is the standard and acceptance for installing steel structure bolts?
1. Hit the high-strength bolts with a 0.3kg hand hammer for census to check whether there is any leakage; the tightening of the high-strength bolts with large hexagon heads should be divided into initial and final screwing; the tightening of torsion shear type high-strength bolts should be divided into initial screwing and final screwing. For large nodes, it should be divided into initial screwing, re-screwing, and final screwing, and the re-screwing torque is equal to the initial screwing torque.
Standard for Steel Structure Bolts
The initial screwing torque is found in Table 07-4: the initial screwing, re-screwing and final screwing of high-strength bolts should be completed on the same day.
2. If it is found that there are non-compliance with the regulations, expand the inspection on this node by 10%; if there are still unqualified persons, re-tighten the high-strength bolts of the entire node; the friction surface at the connection of the high-strength bolts must ensure that the determined treatment method shall not be changed without authorization; and keep the friction surface dry, such as rainproof measures must be taken during construction in rainy days; after the installation of the high-strength bolts, a special wrench should be used for tightening and tightening in time. In order to speed up the construction progress, a plum wrench and a stay wrench can be used to tighten the nut to the connection plate and then use a special torque wrench to tighten it; the torque wrench used for construction should be corrected.
Standard for Steel Structure Bolts
3. Check the tightening torque: check the torque of 10% of the number of bolts at each node, but not less than one. Take any bolt, draw a straight line on the end face of the screw and the nut, loosen the nut by 60 °, and then tighten it again with a torque wrench to make the two lines coincide. At this time, the measured torque should be in the range of 0.9Tch~ 1.1 Tch. The inspection torque (Tch) is calculated as follows: Tch = k × P × d (NM), when the friction surface clearance t is greater than 3mm, a backing plate is added, the thickness of the backing plate is not less than 3mm, and the number does not exceed 3 layers; the material of the backing plate and the treatment of the friction surface are the same as the components.
The above is about the installation of steel structure bolts standard and acceptance is how to share, although the bolt is not large, but it is indeed indispensable Oh, want to know more about the partners welcome attention Xinmo fasteners Oh.
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What are the classification and use of high-strength bolts?
High-strength bolts are special bolts made of high-quality carbon steel or low-alloy steel. They are called high-strength bolts because of their high strength. High-strength bolt connections have the advantages of simple and fast installation, good mechanical performance, assembly and disassembly, high pressure bearing, safety and reliability, etc. High-strength bolts are a new type of steel structure connection method developed after riveting connection, and have now developed into one of the main means of steel structure connection today. 1. Classification of high-strength bolts High-strength bolts can be divided into two types: large hexagonal head type and torsion shear type in appearance; if they are divided into 8.8, 10.9, 12.9, etc., according to the performance grade, the large hexagonal head high-strength bolts currently used in our country have 8.8 and 10.9 grades, while the torsion shear type high-strength bolt strength bolt is only 10.9 grades. The large hexagonal head high-strength bolt connection pair consists of a bolt, a nut and two washers (the screw head and the nut each have a washer): the torsion shear type high-strength bolt connection pair consists of bolts, nuts and washers. When bolts, nuts and washers form a connection pair, their performance levels must match. 2. According to the connection method, high-strength bolts can be divided into three types: friction connection, tensile connection and pressure connection. Friction connection and pressure-bearing connection are both shear connection. Bolt friction connection trans
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