A pressure cell fixing device and construction method for measuring tunnel surrounding rock pressure

Abstract

The invention discloses a pressure cell fixing device for measuring the tunnel surrounding rock pressure and a construction method. The device comprises an annular rubber ring which is arranged on anouter ring of a pressure cell and used for fixing the pressure cell; the bottom of the pressure cell is supported by a base support; the base support and the rubber ring are arranged in an anti-sideslip outer sleeve, and the angle of the pressure cell and the fitting degree of the pressure cell fitting into the surrounding rock surface are adjusted through adjusting bolts; the anti-sideslip outersleeve is connected with a lifting sleeve which sleeves a base fixing rod, and the bottom of the base fixing rod is fixed to a fixed base.

Description

technical field [0001] The invention relates to a pressure box fixing device and a construction method for measuring the surrounding rock pressure of a tunnel. Background technique [0002] In underground engineering construction, surrounding rock pressure measurement is one of the selected items. Monitoring personnel often bury pressure gauges for measurement, but in rock tunnels, there are many difficulties in measuring surrounding rock pressure, and the method of embedding pressure cells also has the following disadvantages: [0003] 1. Monitoring personnel often use the method of electric welding the pressure gauge on the initial support steel arch, and this electric welding method will generate high temperature, which will change the calibration coefficient of the pressure box, and eventually lead to large errors or even errors in the measurement results ; [0004] 2. After the pressure box is electric-welded on the steel arch, there is still a large gap between the p...

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Problems solved by technology

[0003] 1. Monitoring personnel often use the method of electric welding the pressure gauge on the initial support steel arch, and this electric welding method will generate high temperature, which will change the calibration coefficient of the pressure box, and eventually lead to large errors or even errors in the measurement results ;

[0004] 2. After the pressure box is electric-welded on the steel arch, there is still a large gap between the pressure box and the surrounding rock, and the pressure box is not in direct contact with the surrounding rock. There is a big difference between the measurement result and the real surrounding rock pressure:

[0005] 3. The bottom surface of the pressure box is in direct contact with the steel arch, the contact surface of the bottom surface of the pressure box is not flat, and the protrusion or indentation of the contact surface of the bottom surface of the pressure box will make the measurement result too large or too small;

[0006] 4. The impact of lateral force on the measurement results was not considered when embedding the pressure cell;

[0007] 5. When the pressure cell measures the surrounding rock pressure at the arch waist or spandrel of the tunnel, the pressure cell is easy to slip, and the shrinkage of the concrete will also cause large errors in the measurement results;

[0008] 6. It is difficult for the pressure cell to keep parallel with the contact surface of the surrounding rock

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