大六角頭高強螺栓連接副含一個螺栓，一個螺母和兩個墊圈;扭剪型高強螺栓連接副含一個螺栓，一個螺母和一個墊圈。大六角頭高強度螺栓副的常用擰緊方法有扭矩法、轉角法和張拉法等。

The high-strength bolt connection pair with large hexagonal head includes one bolt, one nut, and two washers; The torsion shear high-strength bolt connection pair includes one bolt, one nut, and one washer. The commonly used tightening methods for high-strength bolt pairs with large hexagonal heads include torque method, angle method, and tension method.

A.扭矩法

A. Torque method

通過控制施工扭矩值對高強螺栓副進行緊固的方法。采用直接顯示或控制扭矩的扭矩扳手擰緊到規(guī)定的扭矩值。

The method of tightening high-strength bolt pairs by controlling the construction torque value. Use a torque wrench that directly displays or controls the torque to tighten to the specified torque value.

擰緊分為初擰和終擰，對大型節(jié)點應分為初擰、復擰和終擰。

Tightening is divided into initial tightening and final tightening, and for large nodes, it should be divided into initial tightening, secondary tightening, and final tightening.

1）初擰，目的是使連接接觸面密貼，初擰扭矩為終擰扭矩值的50%.初擰后的高強螺栓應用顏色在螺母上標記。

1) The purpose of initial tightening is to make the connection contact surface tightly attached, with an initial tightening torque of 50% of the final tightening torque value. The high-strength bolts after initial tightening should be marked with colors on the nuts.

2）復擰，復擰扭矩為終擰扭矩值的50%，復擰后的高強螺栓應用顏色在螺母上標記。

2) Re tightening, the re tightening torque is 50% of the final tightening torque value, and the high-strength bolt after re tightening should be marked with color on the nut.

3）終擰，按本批次連接副扭矩值所計算的終擰值（施工扭力值）進行終擰。

3) Final tightening shall be carried out according to the final tightening value (construction torque value) calculated based on the torque value of the connecting pair in this batch.

B.轉角法

B. Corner method

轉角法是通過控制螺栓與螺母相對轉角值對高強螺栓連接副進行緊固的方法，即在板層間緊密接觸后，利用螺母的旋轉角度以控制螺桿彈性伸長量來控制螺栓軸力值。轉角法擰緊施工分為初擰和終擰兩步進行(必要時需增加復擰)。

The angle method is a method of tightening high-strength bolt connections by controlling the relative angle between bolts and nuts. After close contact between the plate layers, the rotation angle of the nut is used to control the elastic elongation of the screw and control the axial force value of the bolt. The corner method tightening construction is divided into two steps: initial tightening and final tightening (additional tightening may be necessary).

(1)初擰，采用定矩扳手擰緊螺栓。目的是使連接接觸面密貼，初擰扭矩，對常用螺栓(M22、M24)定在200~300N·m比較合適;

(1) Initial tightening, use a torque wrench to tighten the bolts. The purpose is to make the connection contact surface tightly attached, and the initial tightening torque is suitable for commonly used bolts (M22, M24) to be set at 200-300N · m;

(3)終擰，用專用扳手再將螺母擰緊一定的角度，使螺栓軸力達到施工預拉力。終擰角度按表規(guī)定執(zhí)行。

(3) Finally tighten the nut with a  special wrench at a certain angle, so that the axial force of the bolt reaches the construction pre tension. The final tightening angle shall be executed according to the table.

C.張拉法

C. Tensioning method

張拉法是用張拉器直接張拉螺栓，使其達到規(guī)定的預拉力，然后上緊螺帽加以固定。在張拉器上直接可以顯示螺栓的拉力。

The tensioning method is to use a tensioner to directly tension the bolt to achieve the specified pre tension, and then tighten the nut to fix it. The tension of the bolt can be directly displayed on the tensioner.

大六角頭高強度螺栓施擰結束后，要進行質量檢查。方法是：

After the tightening of high-strength bolts with large hexagonal heads, quality inspection should be carried out. The method is:

用小錘輕擊螺栓，檢查螺母的轉動角度是否足夠;用0.3mm厚的試插器插入連接板層之間看是否緊密;用更準確的扭力扳手抽查5%的螺栓

Lightly tap the bolt with a small hammer to check if the rotation angle of the nut is sufficient; Insert a 0.3mm thick test plug between the connecting board layers to check for tightness; Use a more precise torque wrench to spot check 5% of the bolts