High-precision pore water pressure gauge based on sealing film

Abstract

The invention relates to a high-precision pore water pressure gauge based on a sealing film. The high-precision pore water pressure gauge comprises a top cover, an upper shell, a protective shell, a permeable stone, a lower shell, a bottom cover, an external wire and a pressure sensor. The pressure sensor is arranged in the lower shell, the permeable stone is arranged between the upper shell and the lower shell, the protective shell is arranged at the outer side of the permeable stone, and the two ends of the protective shell are arranged at the outer side of the upper shell and the outer sideof the lower shell respectively. The protective shell structure is adopted, the permeable stone is prevented from making direct contact with a soil body, and the permeable stone is not prone to clogging or damage; vent holes are formed in the upper parts of the top cover, the shells and the protective shell, so that air in the pore water pressure gauge is discharged conveniently, and the measurement accuracy is improved; and the pressure sensor is wrapped by a flexible film, the space between the flexible film and the pressure sensor is filled with air-free water, pore water does not make direct contact with the pressure sensor, the influence of gas in the pore water on the measurement result is avoided, and the measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of engineering monitoring, in particular to a high-precision pore water pressure gauge based on a closed membrane. Background technique [0002] In engineering construction fields such as foundation pit engineering, foundation engineering, and dam engineering, it is inseparable to monitor the underground pore water pressure during and after the construction, and the pore water pressure gauge is a professional equipment for pore water pressure monitoring. The most commonly used pore water pressure gauges include vibrating wire pore water pressure gauges and air pressure pore water pressure gauges. The principle is that pore water penetrates permeable materials and acts on the sensing diaphragm, and then induces related physical phenomena through the deformation of the sensing diaphragm. . Taking the vibrating wire pore water pressure gauge as an example, its working principle is that pore water enters throug...

AI Technical Summary

Problems solved by technology

[0004] 1. When the existing pore water pressure gauge is buried in the soil, the permeable stone is in direct contact with the soil, which is prone to silting, and when the soil pressure is high, the permeable stone will also be damaged;

[0005] 2. When measuring with the existing pore water pressure gauge, the pore water in the soil layer passes through the permeable stone and directly acts on the sensing diaphragm of the pressure sensor. The air in the pore water often has a great impact on the measurement results;

[0006] 3. Existing pore water piezometers generally do not consider the exhaust situation, and the air inside the pore water piezometer is not easy to discharge, which affects the measurement results;

[0007] 4. It is difficult to disassemble the existing pore water pressure gauge, and it is difficult to replace the permeable stone when it is silted up or damaged, and when it is saturated, the pore water pressure gauge needs to be put into the water to saturate

[0008] The above-mentioned problems existing in existing pore water piezometers directly affect the accuracy of measurement data and the convenience of operation. Therefore, it is important to develop a high-precision pore water piezometer to solve the problems existing in the prior art. significance

Images