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Method for measuring stress of tunnel steel arch centering by utilizing vibrating wire surface strain sensors

A strain sensor, steel string type technology, applied in the measurement of elastic deformation force through measuring gauges, etc., can solve the problems of test result influence and high test data, and achieve the effect of convenient and fast installation, accurate measurement data and convenient test.

Inactive Publication Date: 2011-10-19
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the steel bar stress sensor is wrapped in the shotcrete after the shotcrete, and the test results will be affected, especially the temperature effect caused by the heat of hydration of the shotcrete during the solidification process, which makes the test data higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] Install a pair of sensors on the upper and lower edges of a measuring point. First weld the bracket with the calibration rod to the flange plate of the profile steel arch. After the bracket cools, put the surface strain sensor on the bracket for debugging. Do not use excessive force during the debugging process to ensure that the initial frequency of the surface strain sensor is accurate. The initial frequency is the frequency corresponding to when the strain is zero. After debugging, use a metal box to protect the surface strain sensor to prevent the sprayed concrete from affecting the normal operation of the sensor, and to avoid the sprayed concrete resistance when the sensor and the steel frame deform together to ensure the accuracy of the measurement data. Finally, the anchor The prefabricated tin box is sealed and anchored. Measure the strain value of the steel arch frame after being stressed, and then calculate the stress value of the steel frame.

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PUM

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Abstract

The invention relates to a method for measuring the stress of a tunnel steel arch centering by utilizing vibrating wire surface strain sensors. The stress and strain of the steel arch centering can be truthfully reflected, convenience of test and high measurement accuracy are ensured. The technical scheme provided by the invention is that: the vibrating wire surface strain sensors are arranged onthe upper and lower edges of the tunnel steel arch centering, and measure a strain value of the stressed steel arch centering, and then a stress value of the tunnel steel arch centering is calculated. The vibrating wire surface strain sensors are arranged on the surfaces of the upper and lower edges of the tunnel steel arch centering so as to be closely connected with the tunnel steel arch centering. After the arrangement of the vibrating wire surface strain sensors is finished, metal dispensers are covered on the surfaces of the vibrating wire surface strain sensors, and are sealed and anchored by an anchoring agent.

Description

1. Technical Field: [0001] The invention relates to a tunnel monitoring and measuring method, in particular to a method for measuring the stress of a tunnel section steel arch frame by using a steel string type surface strain sensor. 2. Background technology: [0002] In the background art, with the vigorous development of highway traffic, the number and construction scale of highway tunnels have rapidly expanded, and more and more technical problems are faced. In tunnels with poor surrounding rock levels, the early surrounding rock pressures increase rapidly, and strong support needs to be provided in time. Especially for sand, pebbles, soil interlayers, large-area water-drenching sections, and large-deformation sections of surrounding rock, it is necessary to adopt The strong initial support ensures timely and effective support strength and rigidity. In the initial support structure, the profiled steel arches play a huge role and play a vital role in restraining the deformatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/04
Inventor 陈建勋罗彦斌
Owner CHANGAN UNIV