Low headroom tunnel wrist arm positioning device

Abstract

The invention relates to a low-clearance tunnel cantilever positioning device which is formed by an arch flat cantilever 1, a positioning tube 2, an inclined cantilever 3, a catenary seat 6, a positioning support 7 and a limiting positioner 8. The positioning tube 2 is fixed at the lower part of the horizontal section of the arch flat cantilever 1; the upper end of the inclined cantilever 3 is hinged to the lower part of the inner end of the positioning tube 2; the upper end of the positioning support 7 is arranged on the positioning tube 2; the limiting positioner 8 is arranged at the lower end of the positioning support 7; and the catenary seat 6 is arranged on the horizontal section of the arch flat cantilever 1. According to the invention, the inclined arm section of the arch flat cantilever is clung to the wall of a tunnel to be mounted, so that the installation and fixing point of the flat cantilever is shifted down, and thus, the cantilever is integrally close to the wall of the tunnel to the greatest degree along the horizontal direction. The low-clearance tunnel cantilever positioning device has a compact structure, saves the installation space, completely meets the requirement of a low-clearance tunnel for the small-space installation and can meet the boundary requirement whether on the straight line section or the curved section of the low-clearance tunnel.

Description

technical field [0001] The invention belongs to the technical field of catenary parts for electrified railways, and in particular relates to a wrist-arm positioning device for low-clearance tunnels. Background technique [0002] Electrified railways usually use open tunnels with large cross-sections, and there is enough space to use various catenary arm positioning devices. With the use of the shield machine, the excavation speed of the tunnel has been increased, but the cross section of the tunnel is also restricted by the shield machine, and a low-clearance tunnel with relatively small space appears. For the low-clearance tunnel, the existing wrist-arm positioning device It cannot be installed and used at all, and a wrist arm positioning device suitable for low headroom tunnel space is required. [0003] The closest existing technology to the present invention is the utility model patent (CN202608589U) of "Integral Wrist Arm Positioning Device for Electrified Railway Cate...

AI Technical Summary

Problems solved by technology

There are the following defects: first, the horizontal wrist arm cannot be installed close to the tunnel wall, which takes up a lot of space, and the installation of fixed points at the end of the horizontal wrist arm will restrict the overall movement of the wrist arm to the tunnel wall in the horizontal direction, and the charged body will easily exceed the insulation limit; The load-bearing cable seat and the positioning support are installed on the horizontal section of the inclined arm at the same time, which will lengthen the single cantilever at the front end of the arm and weaken the rigidity; third, the flat and inclined arm is integrated, which is inconvenient to adjust the arm during construction

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