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Constant-pressure frost heaving test water replenishing and draining device for monitoring change of water quantity in real time

A real-time monitoring and frost heaving test technology, applied in the direction of material thermal expansion coefficient, etc., can solve problems such as errors, inability to provide supplementary drainage pressure at the same time, reading errors, etc., to achieve low production costs, accurate and reliable measurement results, and reduce water evaporation. Effect

Pending Publication Date: 2018-09-18
BEIJING URBAN CONSTR GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the frost heaving test used the Martens flask as the water replenishing device, which had the following disadvantages: (1) Since the Martens flask was designed with an open mouth, water evaporation was inevitable, and certain errors occurred in the calculation of the water volume; The scale measurement is used, and when reading the scale, there will be a certain reading error; (3) the Martens flask cannot provide constant replenishment and drainage pressure at the same time, and there will be a certain error in the detailed analysis of frost heaving and thawing.

Method used

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  • Constant-pressure frost heaving test water replenishing and draining device for monitoring change of water quantity in real time
  • Constant-pressure frost heaving test water replenishing and draining device for monitoring change of water quantity in real time
  • Constant-pressure frost heaving test water replenishing and draining device for monitoring change of water quantity in real time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: A constant pressure frost heaving test replenishment and drainage device for real-time monitoring of water volume changes. The device includes a constant pressure replenishment and drainage system and a real-time monitoring system for water volume changes. Its components and composition are as follows Figure 1 to Figure 5 shown.

[0031] For details, see Figure 1-2 , The constant pressure replenishment and drainage system includes a visual water storage tank, a constant pressure system, and a water supply system;

[0032] The visible water storage tank is composed of an outer glass cylinder 7, an inner glass cylinder 5 and a "convex"-shaped bottom plate 10. The outer glass cylinder 7 is sealed and connected to the periphery of the integral part 28 of the "convex"-shaped bottom plate, and the inner glass cylinder 5 is sealed. Connect the protruding part 27 peripheral edge of " convex " font base plate, constitute inner and outer tube structure, the seali...

Embodiment 2

[0043] Example 2: see again Figure 3-4 , the device also includes a water level adjustment system, the adjustment system carries the spoke pressure sensor. With the help of the water level height adjustment system, the height of the water storage tank can be adjusted as required, thereby adjusting the height of the overflow port of the overflow pipe, that is, adjusting the water level height of the inner cylinder 16 to achieve the purpose of adjusting the height of the replenishment water head. The water level height adjustment system can adopt various suitable lifting devices, as long as the height of the water storage tank can be adjusted through the spoke type pressure sensor.

[0044] see Figure 4 , a specific water level adjustment system, including a support frame made up of threaded screw rods 3 and lower fixing plates 14, preferably two threaded screw rods 3 are located on both sides of the visible water storage tank, and the lower fixing plates 14 are located on bo...

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Abstract

The invention relates to soil layer frost heaving test water replenishing and draining device, in particular to a constant-pressure frost heaving test water replenishing and draining device for monitoring a change of a water quantity in real time. The constant-pressure frost heaving test water replenishing and draining device comprises a constant-pressure water replenishing and draining system anda water quantity change real-time monitoring system, wherein the constant-pressure water replenishing and draining system comprises a visual water storage groove, a constant-pressure system and a water feeding system. For the constant-pressure frost heaving test water replenishing and draining device provided by the invention, by virtue of the constant-pressure water replenishing and draining system, a water replenishing and draining pressure is constant, and constant-pressure frost heaving is realized; by adopting a high-accuracy spoke type pressure sensor to monitor the change of the waterquantity in real time, the water migration condition in a frost heaving test can be recorded in real time, and the constant-pressure frost heaving test water replenishing and draining device is high in sensitivity and accurate and reliable in measurement result and can be used for drawing; meanwhile, the device can regulate a water level through up and down movement of a screw rod; and as a waterstorage barrel is equipped with a top cover, moisture evaporation is reduced, influence by environmental factors is relatively small, a long-term stable water source can be provided to the frost heaving test, and the frost heaving water migration rule is studied, closer to the actual condition. The device is low in production cost, simple in structure, liable to mount and simple and feasible in operation method.

Description

technical field [0001] The invention belongs to the technical field of replenishment and drainage for soil frost heave tests, in particular to a constant pressure frost heave test replenishment and drainage device for real-time monitoring of water volume changes. Background technique [0002] Artificial freezing technology is widely used in engineering fields such as coal mine shaft construction projects, subway communication channels, shield tunnel entry and exit shafts, and shield tail brush replacement due to its advantages of good safety, wide applicability, flexibility and controllability, and environmental protection. However, the freezing method also has some disadvantages, that is, frost heaving and thawing settlement. The frost heaving and thawing settlement characteristics of the formation should be fully considered in the freezing design. Frost heaving and thawing experiments are divided into open system freezing test and closed system freezing test, among which t...

Claims

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Application Information

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IPC IPC(8): G01N25/16
CPCG01N25/16
Inventor 张晋勋杨昊周桐单仁亮江玉生武福美邱德隆
Owner BEIJING URBAN CONSTR GROUP