Coal mine underground horizontal deep hole fiber grating strain sensor laying device and construction method thereof

Abstract

The invention relates to a coal mine underground horizontal deep hole fiber grating strain sensor laying device and a construction method thereof. The device comprises an outer pipe, a front end guiding device, a sensor laying device, a hydraulic pushing device, a water pipe and a butt joint external water change device, the front end guiding device is arranged at the front end of the outer pipe,the sensor laying device is arranged at the rear end of the outer pipe, the front end of the hydraulic pushing device is connected with the outer pipe, the water pipe is connected with the rear end ofthe hydraulic pushing device in an inserted mode, and the butt joint external water change device is connected with the rear end of the water pipe in an inserted mode. The device is used for quick installation of a deep hole fiber grating strain sensor and real-time detection of the hole entering process, the sensor laying device, the hydraulic pushing device and the water pipe can be flexibly adjusted according to the number of monitoring points and the drilling depth, the device is simple in operation, convenient and flexible, the defects in the prior art can be overcome, the in-hole condition can be effectively detected, the contact degree with the coal wall is good, the reliability is high, and the recovery is facilitated.

Description

technical field [0001] The invention relates to the technical field of in-hole geophysical prospecting, in particular to an underground horizontal deep hole optical fiber grating strain sensor layout device and a construction method thereof. Background technique [0002] Fiber Bragg grating monitoring methods are widely used in coal mines to monitor stress changes in the working face and gas concentration and other parameters. Make sure that the fiber grating strain sensor can be effectively coupled with the hole wall so that accurate signals can be collected. At present, the method of placing the fiber grating strain sensor in the hole is relatively simple. The sensor is tied to the PVC pipe, the sensor is pushed into the bottom of the hole by manpower, and then the sensor is fixed by grouting to the bottom of the hole; this method has the following disadvantages , 1. A waste of manpower and material resources. 2. The situation in the hole is complicated and easy to damage...

AI Technical Summary

Problems solved by technology

At present, the method of placing the fiber grating strain sensor in the hole is relatively simple. The sensor is tied to the PVC pipe, the sensor is pushed into the bottom of the hole by manpower, and then the sensor is fixed by grouting to the bottom of the hole; this method has the following disadvantages , 1. Waste of manpower and material resources 2. The situation in the hole is complicated and easy to damage the sensor 3. The sensor cannot be recycled, which increases the project cost

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