High strength bolt is a high-strength bolt, which belongs to a standard part. It is mainly used for the connection of railway tracks, bridges and other equipment, so what is high-strength bolt? What are the tools for fastening high-strength bolts? Let's share the relevant knowledge.

什么是高强螺栓?

What is high strength bolt?

高强度螺栓是用高强度钢制造的，如优良碳素钢或低合金钢材料，制成的一种特殊螺栓，或者需要施以较大预紧力的螺栓，都可称为高强度螺栓。高强度螺栓具有强度高的特点。

High strength bolt is a special bolt made of high-strength steel, such as excellent carbon steel or low-alloy steel, or a bolt requiring large preload, which can be called high-strength bolt. High strength bolts have the characteristics of high strength.

高强螺栓的用途

Application of high strength bolt

高强螺栓主要应用在钢结构工程上,用来连接钢结构钢板的连接点。多用于桥梁、钢轨、高压及高压设备的连接。这种螺栓的断裂多为脆性断裂，应用于高压设备上的高强度螺栓，为了保证容器的密封，需要施以较大的预应力。

High strength bolts are mainly used in steel structure engineering to connect the connection points of steel structure steel plates. It is mainly used for the connection of bridges, rails, high-voltage and high-voltage equipment. The fracture of this kind of bolt is mostly brittle fracture. For high-strength bolts applied to high-pressure equipment, large prestress is required to ensure the sealing of the container.

高强螺栓的分类

Classification of high strength bolts

高强螺栓分为扭剪型高强螺栓和大六角高强螺栓，大六角强螺栓是由一个螺栓，一个螺母，两个垫圈组成。扭剪型高强螺栓是由一个螺栓，一个螺母，一个垫圈组成。

High strength bolts are divided into torsion shear high strength bolts and large hexagon high strength bolts. Large hexagon high strength bolts are composed of one bolt, one nut and two washers. Torsional shear high-strength bolt is composed of a bolt, a nut and a washer.

大六角高强螺栓属于普通螺丝的高强度级,而扭剪型高强螺栓则是大六角高强螺栓的改进型，为了更好施工。

Large hexagon high-strength bolt belongs to the high-strength grade of ordinary screw, while torsion shear high-strength bolt is an improved type of large hexagon high-strength bolt for better construction.

高强度螺栓的连接方法

Connection method of high strength bolt

高强度螺栓是用特制的扳手上紧螺帽，使螺栓产生巨大而又受控制的预拉力，通过螺帽和垫板，对被连接件也产生了同样大小的预压力。在预压力作用下，沿被连接件表面就会产生较大的摩擦力，只要轴力小于此摩擦力，构件便不会滑移，连接就不会受到破坏，这就是高强度螺栓连接的原理。

The high-strength bolt uses a special wrench to tighten the nut, so that the bolt produces a huge and controlled pre tension. Through the nut and base plate, it also produces the same pre pressure on the connected parts. Under the action of preload, a large friction force will be generated along the surface of the connected part. As long as the axial force is less than this friction force, the component will not slip and the connection will not be damaged. This is the principle of high-strength bolt connection.

高强螺栓的施工一定先初紧后终紧,初紧高强螺栓需用冲击型电动扳手或扭矩可调电动扳手;而终紧高强螺栓有严格的要求,终紧扭剪型高强螺栓一定用扭剪型电动扳手,终紧扭矩型高强螺栓一定用扭矩型电动扳手。

The construction of high-strength bolts must be tightened first and then finally. The impact electric wrench or torque adjustable electric wrench is required for the initial tightening of high-strength bolts; The final tightening of high-strength bolts has strict requirements. The final tightening of torsional shear high-strength bolts must use torsional shear electric wrench, and the final tightening of torque high-strength bolts must use torque electric wrench.

紧固高强螺栓的工具有哪些？

What are the tools for fastening high-strength bolts?

电动扭剪扳手：用于紧固高强度扭剪螺栓，并且在紧固完成后将剪断的梅花头保留在套筒内部不掉落，随后扣动扳机将梅花头弹出，动力为220V或110V交流电源，相比较与传统六角螺栓，扭剪螺栓配合电动电动扭剪扳手，施工方便快捷，扭矩控制准确并且方便检查。

Electric torsion shear wrench: it is used to fasten high-strength torsion shear bolts, and keep the cut plum blossom head inside the sleeve after fastening, and then pull the trigger to pop up the plum blossom head. The power is 220V or 110V AC power supply. Compared with traditional hexagonal bolts and torsion shear bolts with electric torsion shear wrench, the construction is convenient and fast, the torque control is accurate and convenient for inspection.

电动扭矩扳手：电动扭矩扳手专用于紧固有扭力要求的六角螺栓，动力为220v或110v交流电源，带有扭矩控制器，在一定范围内输出扭矩可调。且控制精度高，重复精度高可达±3%，摒弃电机反正转，采用更加机械式反正转，减少电机损耗，提高可靠性。

Electric torque wrench: the electric torque wrench is specially used to fasten hexagon bolts with torque requirements. The power is 220V or 110V AC power supply, with torque controller, and the output torque is adjustable within a certain range. The control precision is high, and the repetition precision can reach ± 3%. Instead of the motor reverse rotation, the more advanced mechanical reverse rotation is adopted to reduce the motor loss and improve the reliability.