Views: 0 Author: Site Editor Publish Time: 2023-01-19 Origin: Site
Bolts made of high-strength steel, or bolts that require high preload, are called high-tensile bolts. High tensile bolt is used in bridges, rails, high-pressure, and ultra-high-pressure equipment connections, and can also be used in ultra-high-pressure equipment, but to ensure the sealing of the container, a high preload is required.
Here is the content list:
l Classification of high tensile bolt
l Application range of high tensile bolts
l Notes on the use of high tensile bolt
1. From the appearance can be divided into the large hexagonal head type and twisted shear type two: large hexagonal head high tensile bolt connection vice by a bolt, a nut, and two washers (screw head and nut have a washer); twisted shear type high tensile bolt connection vice by the bolt, nut and washer combination. When the bolt, nut, and washer form a connection pair, their performance level must match.
2. According to the connection method, a high tensile bolt can be divided into friction connection, tension connection, and pressure connection. Friction and pressure connections are shear connections. While the bolt friction connection is the shear force transmitted through the anti-slip force between the plates, the sliding between the plates is the limit state of its load-bearing capacity, this connection can be called an anti-slip connection or friction connection. There are many types of pressure-bearing high tensile bolts, including those that apply pre-tension or arbitrarily apply 50% pre-tension, assembly knockouts, and common hole types, all of which are based on sliding between layers.
The high tensile bolt is used in large-span houses, industrial plant steel structures, high-rise building steel frame structures, bridge structures, heavy lifting machinery, and other important structures. According to the type of connection, the bolt is used in the following three ways.
1. Installation wipe type high tensile bolt is suitable for beam-column connection in the steel frame structure, heavy crane beam connection in industrial plant, solid web beam connection, brake system, and important structure bearing dynamic load.
2. High tensile bolts can be used for shear connections in static load structures that allow a small amount of sliding or in members that are indirectly subjected to dynamic loads.
3. Tensile high tensile bolt in tension, its fatigue strength is low, and its bearing capacity under dynamic load cannot easily exceed 0.6P (P is the allowable axial force of the bolt). Therefore, it is only suitable for use under static loads, such as the flange butt joint of compression rod, T-joint, etc.
1. High tensile bolt surface should be cleaned of floating rust, oil, burrs, and weld tumors on the bolt hole wall.
2. The contact friction surface should reach the required anti-scratch coefficient after treatment. The high tensile bolt should be used with matching nuts and washers, when used by the matching use, not interchangeable.
3. The friction surface of the treated component is not allowed to be stained with oil, mud, and other debris when installed.
4. The friction surface of the components should be kept dry during installation, and the installation work should not be carried out in the rain.
5. The deformation of the connected steel plates must be strictly checked and corrected before installation.
6. It is forbidden to hammer into the bolts during installation to prevent the bolts from being damaged.
7. The electric wrenches should be tested regularly when used to ensure the accuracy of the torque and operate in the correct torsion sequence.
The above is the relevant content about the information about the high tensile bolt. If you are interested in a high-tensile bolt, you can contact us, our website is www. suqingfasteners.com. I look forward to your arrival very much and hope to cooperate with you.
