Precise positioning system for tunnel leading pipe shed and construction method of precise positioning system

Abstract

The invention provides a precise positioning system for a tunnel leading pipe shed. The precise positioning system comprises a guiding wall, a guiding pipe and supporting parts. The outer end of the guiding pipe extends out of the guiding wall and is detachably connected with a group of laser positioning parts; a drilling device is arranged in the guiding pipe in a penetrating mode; the laser positioning parts comprise at least two positioning plates arranged in parallel at intervals; circular holes are formed in the positioning plates; connecting lines between the circular holes correspond tothe center line of the guiding pipe; and the drilling device is provided with a drill bit and a drill pipe with limiting parts. The construction method of the precise positioning system includes thesteps that based on a laser rangefinder, the drilling distance is positioned through the circular holes of the positioning plates, space limiting is carried out according to the limiting parts on thedrill pipe, rectification adjustment is carried out through a guiding drill bit, and in this way, precise positioning of the leading pipe shed is combined. According to the precise positioning systemfor the tunnel leading pipe shed and the construction method of the precise positioning system, precise control of the drilling angle is facilitated, space displacement is limited in the drilling process, easy manufactured positioning elements, convenient use, easy and controllable implementation of the positioning method can both effectively save the working time and improve the construction quality.

Description

technical field [0001] The invention belongs to the field of tunnel construction, and in particular relates to a precise positioning system and construction method of an advanced pipe shed for a tunnel. Background technique [0002] With the continuous extension of underground engineering and tunnel engineering to areas such as river valleys, foothills, and terraces, the geological conditions faced by construction are becoming more and more complex and changeable. Among them, multi-section layered excavation through existing buildings and tunnels requires Support reinforcement, and advanced pipe shed support is a commonly used reinforcement method in tunnel engineering. The advance pipe shed support is one of the auxiliary measures taken ahead of the excavation of the working face to ensure the stability of the tunnel excavation face. , will cause the problem that the pipe shed penetrates the superstructure (structure) or affects the effect of the advance support. However, ...

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Problems solved by technology

The advance pipe shed support is one of the auxiliary measures taken ahead of the excavation of the working face to ensure the stability of the tunnel excavation face. , will cause the problem that the pipe shed penetrates the superstructure (structure) or affects the effect of the advance support. However, the traditional advance pipe shed of the tunnel at present simply adopts a guide frame composed of 3 I-beams at the entrance of the tunnel. The guide pipe is buried on the frame, the guide wall is poured with concrete, and then the pipe shed is directly drilled and installed. There are no effective precise positioning measures before the construction of the pipe shed, and there is no measure to control the torsion of the drill pipe during the construction process.

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