Tunnel convergence displacement and arch crown settlement measuring device and measuring method

Abstract

The invention provides a tunnel convergence displacement and arch crown settlement measuring device and measuring method. The measuring device is mounted on a tunnel wall and comprises an alignment device fixedly mounted on the tunnel wall, a laser distance measuring sensor mounted on the alignment device and a reflector mounted on a measuring point on the tunnel wall. The alignment device comprises a base, a ball socket is arranged in the base and is in spherical fit with a ball head rotor; the ball head rotor is fixedly connected with the laser distance measuring sensor; a locking device is arranged between the ball socket and the ball head rotor. The base is fixedly mounted on the tunnel wall through an expansion screw; the thread at one end part of the expansion screw is shorter than a threaded hole in the base of the alignment device. The measuring device further comprises an external triggering line and an external triggering button which are connected with the laser distance measuring sensor. Only one measuring device is needed to finish the convergence displacement and arch crown settlement measurement of an entire tunnel; the measurement result is accurate; the requirements of multiple measuring lines, high frequency and big total quantity of tunnel convergence monitoring are met.

Description

technical field [0001] The invention relates to a relative displacement measurement device and measurement method for monitoring tunnels and underground engineering and other cave walls and structures, in particular to a device and method for measuring tunnel convergence displacement and vault settlement. Background technique [0002] In the process of tunnel construction and operation and maintenance, the stability of the surrounding rock or structure of the tunnel can be clearly and intuitively judged through the measurement of the change in the clearance size around the tunnel, that is, the measurement of the convergence displacement around the tunnel. Therefore, convergence displacement is a routine monitoring item in tunnel monitoring, and convergence gauge and level are the most important instruments for monitoring tunnel convergence displacement. [0003] Convergence displacement monitoring around the tunnel mainly uses a rod-scale extensometer or a string-type extens...

AI Technical Summary

Problems solved by technology

The measuring point of the vault is high (more than 6 meters), and the suspension is very difficult. The scale suspended at the measuring point of the tunnel vault during the monitoring process will also affect the normal construction work in the tunnel

[0005] There are also some studies on tunnel convergence displacement measurement based on the principle of laser ranging at home and abroad. The devices involved in these studies have more complex structures or larger sizes

During the entire monitoring period, the fixing device of the laser ranging sensor needs to be installed on the tunnel wall, which is easily affected by blasting vibration or mechanical impact, which affects the monitoring accuracy and may even damage the measuring device

In addition, due to the limitation of the structure of the fixture, some laser ranging sensors have specific requirements for the installation position of the measuring point and the instrument, otherwise the laser emitting end cannot be aligned with the target point to be measured

[0006] In the method of measuring the convergent displacement around the tunnel with the existing convergent gauge or laser rangefinder sensor, each measuring line needs to be installed with a convergent gauge or a corresponding laser rangefinder fixture. Requirements for multiple monitoring lines, high frequency, and large total volume

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