Tunnel back break control laser lofting device

Abstract

The invention discloses a tunnel back break control laser lofting device, which comprises an outer ring support frame (4) made to present a corresponding shaped through being slightly reduced according to the outline line of a tunnel, wherein a plurality of laser emitters (8) are arranged on the upper edge of the outer ring support frame (4) in the circumference direction, laser beams (11) emitted by the laser emitters (8) can be projected on the digging surface for indicating the side hole position, the laser emitters (8) are electrically connected with a power supply box (12), and a plumb line (17) and a point measuring mark (18) are arranged on the outer ring support frame (4). The tunnel back break control laser lofting device has the beneficial effects that the structure is simple, the positioning of the device per se is fast, the blast hole lofting synchronous marking is realized, the digging precision is controlled, the back break phenomenon is reduced, and the engineering manufacture cost is saved. The tunnel back break control laser lofting device can adapt to the digging construction control task of various kinds of underground building engineering including curve tunnels and slope tunnels.

Description

technical field [0001] The invention relates to a laser stakeout device for excavation of underground construction projects, in particular to a laser stakeout device for section contours and blast hole positioning when tunnels and other underground buildings are excavated by drilling and blasting. Background technique [0002] At present, when various underground construction projects such as tunnels and culverts are constructed by the drilling and blasting method, the method of manually measuring the center line and steel ruler to locate the blast hole is often used for positioning and setting out of the excavation face, which is time-consuming and laborious, with low work efficiency and poor positioning and setting-out accuracy. It is easy to cause over-excavation or under-excavation, which will have a great impact on construction quality, project progress and cost. [0003] Recently, there have been some techniques for setting out tunnel sections by emitting laser beams, ...

AI Technical Summary

Problems solved by technology

This kind of technology and corresponding instruments have some disadvantages in practical application: the investment in equipment is large, and it is a precision instrument, and the harsh construction environment in the tunnel is a test for the normal operation and service life of the equipment. In addition, because only one laser It is impossible to calibrate all the contour lines and blast hole positions at the same time. In order to ensure the smooth progress of the construction, the operator needs to mark in sequence according to the instructions of the laser beam, and then drill and blast according to the marks. This process needs to be completed on the trolley. Therefore, it is difficult to carry out the slag discharge at the same time. If you want to carry out the work synchronously to save the time of marking the position, there will be mutual interference and influence between the two tasks.

This technology has the characteristics of low price, simple structure, visible light emission, and does not occupy tunnel traffic space to affect construction. It can indicate the direction and slope of tunnel excavation, and calibrate the position of tunnel centerline, but it can only indicate the centerline, and cannot locate the contour line and blast hole. It is difficult to deal with curved tunnels, and manual measurement is required to determine each blast hole during use, which is a heavy workload and not accurate enough

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