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Method for improving precision of opposite side measurement for settlement of tunnel vault

A vault sinking and side-to-side measurement technology, which is applied in height/level measurement, measuring devices, surveying and navigation, etc., to achieve the effect of easy execution, comprehensive results and intuitive results

Inactive Publication Date: 2015-12-23
CHANGAN UNIV
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  • Application Information

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Problems solved by technology

However, there are relatively few researches on the measurement accuracy of this measurement method at present, and there is no specific quantitative conclusion as the basis for on-site measurement to improve the measurement accuracy

Method used

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  • Method for improving precision of opposite side measurement for settlement of tunnel vault
  • Method for improving precision of opposite side measurement for settlement of tunnel vault
  • Method for improving precision of opposite side measurement for settlement of tunnel vault

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] Taking the horizontal convergence measurement of the maximum excavation line of the large-section three-lane loess road tunnel of the Shenmu-Fugu Expressway in Shaanxi Province as an example, a detailed introduction is made.

[0043] When the measuring point is buried, the pre-processed steel plate is used as the base of the reflective diaphragm, and it is welded to the vault position on the first steel arch near the tunnel face after excavation, that is, figure 1 Point A shown corresponds to the location. Then, paste the reflective film on the fixed steel plate, such as image 3 shown. After the reflective film is pasted, wrap the geotextile on the measuring point and wrap it with tape (such as Figure 4Shown), be protected to prevent the reflective diaphragm from being polluted and damaged when spraying concrete.

[0044] According to the actual section size of the large-section three-lane highway tunnel it relies on, the vertical height from the monitoring point t...

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Abstract

The invention relates to a method for improving the measurement precision of the settlement amount of a tunnel vault, in particular to a method for improving the precision of opposite side measurement for the settlement of the tunnel vault. According to the method, a total station opposite side measuring method is adopted, and the measuring precision is improved by selecting a reasonable rearview point and a total station arrangement position based on the practical measurement situation of the amount of field tunnel vault settlement. The method comprises the steps that firstly, a monitoring point is embedded in the vault position of a monitoring section and is protected so as to prevent the monitoring point from being influenced and damaged in tunnel construction; secondly, a reasonable position is selected to embed a rearview reference point; thirdly, the erecting position of a total station is selected according to the horizontal distance between the embedded rearview reference point and the monitoring point; finally, measuring data are read through the opposite side measuring function of the total station, and protection on the monitoring point and the rearview point is restored after every time measurement is completed.

Description

1. Technical field: [0001] The invention relates to a method for improving the measurement accuracy of the tunnel vault sinking, in particular to a method for improving the measurement accuracy of the tunnel vault sinking on the opposite side. 2. Background technology: [0002] Vault sinking is a must-test item for tunnel monitoring and measurement, and its importance is self-evident. At present, the vault settlement of highway tunnels is mainly measured by precision level instruments, but this measurement method is labor-intensive, low in efficiency, and often interferes with on-site construction. For example, when the tunnel is excavated circularly with the core soil left in the arch, before the core soil is excavated, due to the blockage of the core soil, the level gauge and steel ruler cannot be used to effectively read the data, resulting in a lag in the initial measured value, thus losing a part Even a large part of the deformation information of the tunnel surroundin...

Claims

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Application Information

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IPC IPC(8): G01C5/00
CPCG01C5/00
Inventor 罗彦斌陈建勋赵鹏宇李居柱刘同展
Owner CHANGAN UNIV
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