An earth pressure gauge installation and protection device for tunnel construction in sand and pebble formation

Abstract

The invention relates to an installation and protection device for earth pressure gauges in tunnel construction in sand and pebble strata, which is composed of a fixing part, a positioning part, a support adjustment part and a protection part, wherein the fixing part is installed at the lower end of the support adjustment part, and the positioning part is installed at the support adjustment part The upper end of the upper end, the protection part is installed on the peripheral edge of the positioning part, and the positioning part is enclosed to form a protection box, and the earth pressure gauge is installed in the protection box during construction; and at least one of the fixing part and the positioning part can be up and down along the support adjustment part Adjust its installation position on the support adjustment part. The installation and protection device for the earth pressure gauge proposed by the invention meets the requirement that the earth pressure gauge can be installed at any designated position and closely adheres to the surrounding rock, and solves the problem that the back plate of the earth pressure gauge is hollowed out and the value cannot be measured. The overall assembly of the device is convenient, the installation is simple, the cost is low, and the practicability is strong.

Description

technical field [0001] The invention relates to the technical field of stress and strain monitoring in tunnel construction, in particular to an earth pressure gauge installation protection device for tunnel construction in sand and pebble formations. Background technique [0002] In the underground excavation tunnel construction of the subway, the pressure monitoring of the surrounding rock of the tunnel adopts the method of embedding an earth pressure gauge in the surrounding rock. The earth pressure gauge is in the shape of a round cake and has a large weight, so it is difficult to bury it in the vault and side wall of the tunnel. For sand and pebble formations with unstable mechanical properties, sensitive formation responses, and unstable excavation surfaces that are prone to collapse, it is difficult to accurately control the excavation size during construction, resulting in the inability of the earth pressure gauge to closely adhere to the surrounding rock. At present...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies in the existing installation methods of earth pressure gauges, and propose an earth pressure gauge installation protection device for tunnel construction in sandy gravel formations. It meets the requirements of earth pressure test in the sand and pebble formation, buried in the designated monitoring position according to the design

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