Concrete analysis of the tensile capacity of high-strength bolts

Small hardware bolts play an important role, so it is necessary to understand bolts. This article mainly analyzes the tensile strength of high-strength bolts, stud screws and anchor screws. Stud screws and anchor screws can be divided into fixed anchor studs and studs, movable studs and studs, expansion anchor studs and studs, and bonding studs and studs Studs.

The tensile capacity of double-head screws and anchor screws is the tensile capacity of the round steel itself, and the size equal to the cross-sectional area multiplied by the tensile strength design value is the allowable tensile capacity during design.

1. Fixing studs and anchor bolts are also called short studs and foundation studs. They are poured together with the foundation to fix equipment without strong vibration and impact.

2. Movable studs and anchor bolts, also known as long studs and anchor studs, are detachable studs and anchor bolts, which are used for strong vibration and Impact of heavy machinery and equipment.

3. Expansion anchor studs and studs are often used to fix simple equipment or auxiliary equipment that is standing still. The installation of expansion anchor anchor bolts should meet the following requirements: (Guide: What are the standard conditions for fastener products)

(1) The distance from the bolt center to the edge of the foundation is not less than 7 times the diameter of the expansion anchor studs and studs;

(2) The foundation strength for installing expansion anchor anchor snails shall not be less than 10MPa;

(3) There should be no cracks at the drilled hole. Take care to prevent the drill bit from colliding with the steel bar and buried pipe in the foundation.

4. Adhesive studs and studs are a kind of studs and studs commonly used in recent years. The method and requirements are the same as that of anchor bolts. But be careful to blow out the sundries in the hole when bonding, and not get damp.

The quality of studs and foundation studs directly affects the quality of equipment installation. Some equipment has strict requirements on the accuracy of elevation and location, especially the linkage equipment with a high degree of automation, which requires more stringent requirements. Therefore, after the stud bolts and anchor bolts are buried and before the equipment is installed, they must be inspected and corrected. When a deviation occurs, it should be dealt with according to the actual situation of the equipment, and different processing methods should be adopted.

The performance of double-head screws and anchor screws is: the shock-absorbing rubber can effectively attenuate the vibration of the machine itself, reduce the transmission of vibration force, and prevent the transmission of vibration force. The installation of the machine does not require stud bolts and anchor bolts to be installed on the ground. Fixed, saving installation costs and reducing costs.

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