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Device and method applicable to linear tunnel axis positioning measurement

A positioning measurement, linear technology, applied in the direction of measuring devices, optical devices, height/horizontal measurement, etc., can solve the problems of large impact of blasting construction, difficult to find and correct, difficult to guarantee accuracy, etc., to achieve low cost of equipment and saving Effect of measurement time and measurement accuracy guarantee

Active Publication Date: 2017-09-15
CHINA GEZHOUBA GRP THREE GORGES CONSTR ENG CO LTD
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AI Technical Summary

Problems solved by technology

The advantage of this method is that it does not require surveyors to carry out measurement and stakeout on site for each cycle, which improves work efficiency, but the disadvantage is that the laser pointer is fixed and installed near the face of the tunnel, which is greatly affected by the blasting construction and is often used during blasting. In addition, the installation bracket is anchored on the top or waist of the excavated tunnel, and it is often displaced and deformed by the convergence deformation of the surrounding rock. Therefore, the accuracy of this method is often difficult to guarantee, and the surveyors need to make frequent adjustments. Calibration, repeated installation of brackets, and only one laser point, it is difficult to find and correct errors on site

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  • Device and method applicable to linear tunnel axis positioning measurement
  • Device and method applicable to linear tunnel axis positioning measurement
  • Device and method applicable to linear tunnel axis positioning measurement

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Embodiment Construction

[0035] like Figure 1-3 As shown, a measuring device suitable for linear tunnel axis positioning includes laser level 1. The model of laser level 1 is EK-268GJ. When the working distance from the tunnel face is greater than 50m, its maximum eccentricity difference is less than ±10mm, and The relative accuracy meets the requirements of general civil construction lofting. In this way, it can avoid being affected by the impact of flying rocks or the convergence deformation of surrounding rock during blasting. The laser level 1 is centrally connected with the tripod 3 through the connecting mechanism 2 . The connecting mechanism 2 includes a hollow rod 4, which is a 50 mm long, hollow copper cylindrical rod. The hollow rod 4 includes an upper connection part 4-1 and a lower connection part 4-2. One end of the upper connection part 4-1 is connected to the centering screw hole at the bottom of the laser level. The outer diameter (diameter) of the rod end is 16mm, and the inner di...

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Abstract

The invention discloses a device and a method applicable to linear tunnel axis positioning measurement. The method mainly comprises the following steps: laying a central axis control point of a linear tunnel by adopting a total station, erecting a laser level meter on a centered and leveled measuring tripod through a special connecting device, accurately centering the instrument on the central axis control point, calculating the sight height of the instrument by measuring the instrument height or comparing with a reserved elevation point, so that three-dimensional absolute accurate positioning of the laser level meter is realized, a height datum line and an axis datum line with high precision visibility can be provided for a tunnel face construction site, and convenience is brought to field setting-out of a constructor. The equipment used in the method is cheap, simple in operation, high in precision and wide in application range and can perform cross-operation with other processes during setting-out, and the working efficiency is obviously improved.

Description

technical field [0001] The invention relates to the field of tunnel excavation, in particular to a device and method suitable for positioning and measuring the axis of a linear tunnel. Background technique [0002] At present, there are two main methods of surveying and setting out in the drilling and blasting excavation construction of linear tunnels. One is the precise setting out point by point of the total station, which is suitable for excavation of large sections; the other is the combination of the total station and the laser pointer. It is suitable for excavation of small radius circular section. The most frequent measurement operation during underground tunnel excavation is tunnel face stakeout. The core of tunnel face stakeout is to measure and set the drilling and blasting hole position of the cross section of the excavated tunnel under the premise of ensuring the axis stakeout is correct, which not only ensures the accuracy of the tunnel For penetration, it is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C5/00G01B11/27
CPCG01B11/27G01C5/00
Inventor 邱章云王义兵田雪芝曹鹏亮孙泽凤李铁生王小战雷志兵马多刘伟
Owner CHINA GEZHOUBA GRP THREE GORGES CONSTR ENG CO LTD
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