Observation method of foundation settlement based on liquid level difference

Abstract

The invention discloses an observation method of foundation settlement based on liquid level difference. A folding hose is buried in the foundation, and a liquid level sensor is placed in the hose and is led out through a lead wire to be connected with a liquid level observation instrument on one side of the foundation. One end of the hose is connected with a one-way valve and fixed on the surface of the foundation, the other end of the hose is connected with a liquid storage tank on one side of the foundation, and liquid is filled in the liquid storage tank. The liquid level sensor in the hose is utilized to measure the change of the liquid level difference, then the liquid level difference between a settlement point where the liquid level sensor is located and the liquid in the liquid storage tank can be converted out, and then the settling volume of the foundation can be calculated out. Additionally, after the measurement, the senor can be completely pulled back for recovery through a soft rope reserved in the hose. The observation method of the foundation settlement based on the liquid level difference is simple in structure, convenient in operation, accurate in measurement, capable of cyclically utilizing the liquid level sensor and low in monitoring cost.

Description

technical field [0001] The invention belongs to the technical field of civil and water conservancy engineering, in particular to a foundation settlement observation method based on liquid level difference. [0002] Background technique [0003] The problem of foundation settlement observation has become a technical problem in the construction of highways, municipal highways, railways and other projects and the operation of existing lines. Accurately measuring the settlement of the foundation is a problem worthy of attention. By monitoring the settlement of the foundation, it can be reduced or even Prevent uneven settlement or excessive settlement from causing huge losses to construction operations. Before the present invention, conventional settlement observation methods mainly include settlement plate method, section settlement tube method, embedded settlement observation device and the like. [0004] The settlement plate measurement method is a relatively traditional mon...

AI Technical Summary

Problems solved by technology

This observation method has the following defects: (1) The inclinometer tube itself is strong, so it may not deform with the soil in the soft foundation soil, so the settlement of the foundation cannot be accurately measured; (2) The inclinometer tube itself has no stretchability. When the settlement is large, the joint of the inclinometer tube may break, causing soil to enter, which affects the in-depth measurement of the inclinometer. Once the inclinometer tube breaks, the entire section cannot be measured. ; (3) The result of section settlement observation is the settlement of the entire section, but in actual engineering, it may only need to measure the settlement of the middle road and road shoulder, which is equivalent to increasing the observation cost; (4) The cost of section settlement observation is relatively high And the observation quality is difficult to control, which is also an important reason why this method has not been widely used

(5) The measurement of the section settlement instrument is also very troublesome. It is necessary to pull the probe from one end of the section through the entire embankment to the other end, and sometimes two observations are required to obtain the settlement of the embankment

However, engineering practice shows that the device has the following defects in specific applications: (1) It can only perform single-point measurement, and the settlement tube is buried in the corresponding point to be measured and connected to an external electric meter. If you want to measure the settlement of multiple points, you need Embed a corresponding number of the device; (2) The device connects the settling container and the observation tube through a pipeline. Only when the settling tube is filled with water can the water level of the settling tube be consistent with the observation tube. During the foundation settlement process , the connection part of the device (such as the pipe connection part) may be rotated and pulled apart. If leakage occurs at the connection, the device will completely lose the function of measuring foundation settlement and is not suitable for long-term observation; (3) the device The measurement accuracy cannot be guaranteed, because during the observation process, the cap of the observation tube must be untied, and the water in it will evaporate, especially in summer, the water level of the observation tube cannot be guaranteed

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