Rapid burying device for tunnel soil pressure gauge complete contact stress surface and construction method

Abstract

The invention discloses a rapid burying device for a tunnel soil pressure gauge complete contact stress surface. The rapid burying device for the tunnel soil pressure gauge complete contact stress surface comprises a tunnel steel arch frame, an adjustable support, a soil pressure gauge, a concentrated pressure eliminating assembly and an adjustable pressure supply assembly, the adjustable supportis arranged on the tunnel steel arch frame, and the soil pressure gauge is arranged on the upper side of the adjustable support; the concentrated pressure eliminating assembly is arranged between thesensing surface of the soil pressure gauge and a soil layer of a tunnel, and the concentrated pressure eliminating assembly is connected with the adjustable pressure supply assembly through a connecting pipe; the concentrated pressure eliminating assembly comprises a flexible bag and a containing cavity formed in the flexible bag, and the containing cavity is filled with a filling medium. According to the rapid burying device, the soil layer in the tunnel firstly acts on the flexible bag, the flexible bag uniformly distributes an acting force of soil on the cylindrical end surface of the soilpressure gauge under the action of the filling medium, and the situation that the soil pressure gauge is locally stressed is avoided, so that the soil pressure gauge can measure the pressure stress value of the soil above the middle of the tunnel more accurately.

Description

technical field [0001] The invention relates to the field of tunnel detection equipment, in particular to a rapid embedding device and a construction method for a tunnel earth pressure gauge fully in contact with a force-bearing surface. Background technique [0002] The earth pressure gauges in the prior art are all cylindrical, and their working principle is that when the soil stress in the measured structure changes, the sensing plate of the earth pressure gauge will feel the change of stress synchronously, and the sensing plate will deform, and the deformation will be transmitted to the The vibrating wire translates into a change in the stress on the vibrating wire, thereby changing the frequency of vibration of the vibrating wire. The electromagnetic coil excites the vibrating wire and measures its vibration frequency. The frequency signal is transmitted to the reading device through the cable, and the compressive stress value of the measured structure can be measured, ...

AI Technical Summary

Problems solved by technology

However, in the actual application process, due to the uneven surface of the surrounding rock and the uneven surface of the soil, the contact between the end face of the cylinder of the earth pressure and the soil is not uniform, and some soil may contact the earth pressure gauge, and some soil may contact the soil pressure gauge. The pressure gauge is not in contact, which causes the deformation of the sensing plate of the earth pressure gauge to be different, or even a very large error, which makes it difficult for the earth pressure gauge to measure the compressive stress value of the upper soil in the tunnel more accurately

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