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.

什么是高強螺栓?

What is high strength bolt?

高強度螺栓是用高強度鋼制造的，如優(yōu)良碳素鋼或低合金鋼材料，制成的一種特殊螺栓，或者需要施以較大預(yù)緊力的螺栓，都可稱為高強度螺栓。高強度螺栓具有強度高的特點。

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.

高強螺栓的用途

Application of high strength bolt

高強螺栓主要應(yīng)用在鋼結(jié)構(gòu)工程上,用來連接鋼結(jié)構(gòu)鋼板的連接點。多用于橋梁、鋼軌、高壓及高壓設(shè)備的連接。這種螺栓的斷裂多為脆性斷裂，應(yīng)用于高壓設(shè)備上的高強度螺栓，為了保證容器的密封，需要施以較大的預(yù)應(yīng)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.

高強螺栓的分類

Classification of high strength bolts

高強螺栓分為扭剪型高強螺栓和大六角高強螺栓，大六角強螺栓是由一個螺栓，一個螺母，兩個墊圈組成。扭剪型高強螺栓是由一個螺栓，一個螺母，一個墊圈組成。

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.

大六角高強螺栓屬于普通螺絲的高強度級,而扭剪型高強螺栓則是大六角高強螺栓的改進型，為了更好施工。

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.

高強度螺栓的連接方法

Connection method of high strength bolt

高強度螺栓是用特制的扳手上緊螺帽，使螺栓產(chǎn)生巨大而又受控制的預(yù)拉力，通過螺帽和墊板，對被連接件也產(chǎn)生了同樣大小的預(yù)壓力。在預(yù)壓力作用下，沿被連接件表面就會產(chǎn)生較大的摩擦力，只要軸力小于此摩擦力，構(gòu)件便不會滑移，連接就不會受到破壞，這就是高強度螺栓連接的原理。

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.

高強螺栓的施工一定先初緊后終緊,初緊高強螺栓需用沖擊型電動扳手或扭矩可調(diào)電動扳手;而終緊高強螺栓有嚴(yán)格的要求,終緊扭剪型高強螺栓一定用扭剪型電動扳手,終緊扭矩型高強螺栓一定用扭矩型電動扳手。

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.

緊固高強螺栓的工具有哪些？

What are the tools for fastening high-strength bolts?

電動扭剪扳手：用于緊固高強度扭剪螺栓，并且在緊固完成后將剪斷的梅花頭保留在套筒內(nèi)部不掉落，隨后扣動扳機將梅花頭彈出，動力為220V或110V交流電源，相比較與傳統(tǒng)六角螺栓，扭剪螺栓配合電動電動扭剪扳手，施工方便快捷，扭矩控制準(zhǔn)確并且方便檢查。

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.

電動扭矩扳手：電動扭矩扳手專用于緊固有扭力要求的六角螺栓，動力為220v或110v交流電源，帶有扭矩控制器，在一定范圍內(nèi)輸出扭矩可調(diào)。且控制精度高，重復(fù)精度高可達±3%，摒棄電機反正轉(zhuǎn)，采用更加機械式反正轉(zhuǎn)，減少電機損耗，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.