Pre-tightening force measurement device of high-strength bolt

Abstract

The invention relates to a pre-tightening force measurement device of a high-strength bolt. The pre-tightening force measurement device comprises a first strain gage, a second strain gage and a rigid sleeve. The first strain gage and the second strain gage are symmetrically attached to the two sides of a screw, the screw is sleeved with the rigid sleeve, a first hole and a second hole corresponding to the first strain gage and the second strain gage are formed in the two sides of the rigid sleeve respectively, and therefore the first strain gage and the second strain gage are connected with a strain tester after being connected in parallel. The screw and the rigid sleeve are screwed together through a nut. On the premise of guaranteeing that a bolt bar is not damaged, the pre-tightening force measurement device can achieve real-time and accurate measurement of pre-tightening force of the bolt, and therefore the service condition at the connection portion of a connection component of the high-strength bolt can be monitored and detected.

Description

technical field [0001] The invention relates to the technical field of bolt connection of structural engineering steel structures, in particular to a bolt pretightening force measuring device for detecting changes in bolt pretightening force during the service process of bolted components. Background technique [0002] The high-strength bolt connection is convenient for construction, and no welding is required during the construction process, which avoids the adverse effects of the heat-affected zone caused by welding. It is widely used in structures such as steel structure houses, factories and bridges. The high-strength bolts start to serve after the final tightening, and are subjected to external loads, seismic waves, etc. during the service period, which makes the pre-tension strain relax to a certain extent, resulting in the loss of pre-tightening force of high-strength bolts. However, at present, there is no simple and effective method for real-time monitoring of the ...

AI Technical Summary

Problems solved by technology

The high-strength bolts start to serve after the final screwing, and are subjected to external loads, seismic waves, etc. during the service period, which causes the pre-tension strain to relax to a certain extent, resulting in the loss of the pre-tightening force of the high-strength bolts.

However, at present, there is no simple and effective method for real-time monitoring of the loss of bolt pretension without damaging the bolt.

It is impossible to monitor the pre-tightening force loss of the steel structure bolt connection, so it is also impossible to grasp and repair the service status of the bolts in time

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