Construction method of urban stone tunnel cantilever tunneling
A cantilever roadheader and tunnel technology, which is applied to tunnels, tunnel linings, shaft linings, etc., can solve the problems of complex ground pipelines, increased initial injection protection amount, and prolonged sealing period, so as to achieve less risk of collapse and construction. The effect of high efficiency and improved safety
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[0018] Specific embodiments of the present invention are provided below, and it should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations done on the basis of the technical solutions of the present application all fall within the scope of protection of the present invention.
[0019] A cantilever excavation construction method for urban stone tunnels, comprising the following steps:
[0020] (1) Measuring and setting out
[0021] The contour line is released, and the laser is used for positioning;
[0022] (2) Hole face splitting
[0023] The splitting is carried out in cooperation with a splitting machine and a rock drill, with auxiliary drilling and splitting as an auxiliary method to destroy the rock texture and release the rock stress before digging; the drill hole diameter is 5.5cm, and the hole spacing is 0.5m, arranged in a plum blossom shape ;
[0024] (3) Excavation construction of upper step...
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