Cantilever support platform, supporting retaining wall and construction method

Abstract

The invention relates to the field of tunnel side and upward slope protection engineering, in particularly to a cantilever support platform, a supporting retaining wall and a construction method. Thespecific construction process comprises the steps of anchor rod construction, steel box manufacturing, steel box pre-burying, formwork fixing, concrete construction, H-shaped steel platform construction and the like. According to the construction method, a steel box is pre-buried before concrete pouring, then a cantilever H-shaped steel platform is built and constructed, through the cantilever H-shaped steel platform, construction safety and convenience are fully guaranteed, construction tasks are rapidly and efficiently completed, moreover, the cantilever H-shaped steel platform has good bearing capacity, simultaneous construction of multiple drilling machines at high positions can be met at the same time, compared with an existing cantilever support platform, dismounting is faster, and the construction period is greatly shortened.

Description

technical field [0001] The invention relates to the field of tunnel slope protection engineering, in particular to a cantilevered support platform, a roof retaining wall and a construction method. Background technique [0002] Rockfall treatment projects at tunnel entrances are relatively common in actual cases, and the usual protective measures mainly exist in the form of "passive protection nets, active protection nets, and buffer walls". The dangerous rockfall treatment project at the entrance of a tunnel is the largest dangerous rockfall treatment project in a certain area, with high and steep cliffs and well-developed rock mass joints, which are prone to disasters such as rockfall and debris flow, which will cause harm to the construction and operation of the line. Its hazard level is the highest level, and the protection area is about 15000m 2 . The treatment method of dangerous rockfall at the entrance of a tunnel is "the upper part uses a two-stage slope, and the l...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor adaptability, high safety risk and long construction period of the cantilevered support in the prior art, and provide a quick-installed cantilevered support platform, a roof retaining wall and a construction method. The inventive roof retaining wall is set in the dangerous rockfall area of ​​the high and steep slope of the existing line. The construction method of the roof retaining wall adopts a quick-installed cantilever bracket construction scheme, which overcomes the difficulty of erecting the high-altitude platform support, The defect of raw material supply is difficult, and the construction of the roof and retaining wall of the existing line with high and steep slopes is realized economically and efficiently

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