High-Strength Bolt Tightening Wrench For Bridge Construction

The wrenches used to tighten high-strength bolts in bridge construction are no ordinary household wrenches. They require high precision and high torque to ensure that the high-strength bolts achieve the desired, precise preload, thus ensuring safe and reliable steel structure connections.

High-strength bolt connections (such as those with grades 8.8 and 10.9) are based on a "friction-type" principle: the bolts apply a significant preload, clamping the connected steel plates. The load is transmitted through friction between the contacting steel plates. Insufficient preload can lead to slippage and failure; excessive preload can damage the bolts or the steel plates.

Therefore, tightening tools must meet the following requirements:

High precision: Precisely control the applied force with a narrow tolerance.

High torque: Capable of generating thousands or even tens of thousands of Newton-meters (N·m).

Data logging: Modern construction requires data recording of key nodes for quality traceability.

Hanpu wrenches indirectly control the bolt's "preload" by controlling the "torque" applied during tightening. Based on the "torque-preload" relationship (T=Kfd), applying a specific torque will produce a roughly corresponding preload, given the bolt and lubrication conditions.

Hanpu wrenches are categorized into electric torque wrenches, manual torque wrenches, and shear-type electric wrenches. Each type has distinct characteristics and applications. In bridge construction, tightening high-strength bolts typically follows a strict process, with different tools used at different stages:

Initial tightening: Initially tighten the bolts using a standard impact wrench or manual wrench to ensure a tight fit between the connecting plates. Precision requirements are not high at this stage. (Hanpu has developed specialized tightening wrenches specifically for initial tightening of various bolts.)

Re-tightening: Further tightening is achieved based on the initial tightening.

Final tightening: This is the most critical step, requiring the use of a properly calibrated precision torque wrench (electric or hydraulic) or shear-type electric wrench to achieve the designed preload.

Hanpu wrenches are frequently used in the construction of numerous bridges both domestically and internationally. They are precision bolt tightening tools designed to ensure century-long bridge safety.

The following are Hanpu's most popular wrench models:

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