A construction method of a detachable portal frame in an expansive mudstone orthogonally inclined shaft

Abstract

The invention relates to a construction method of a detachable gantry for an expansive mudstone orthogonal inclined shaft, which effectively solves the problems of narrow construction work surface, poor integrity and high construction risk in the traditional construction method; the construction method is: The steel frame construction of the pilot hole starts at the reinforcement section of the deformation joint of the well. After it is closed into a ring, the soil is backfilled from the position of the third steel frame, so that the pilot hole forms a 24° ramp, and then the construction of the pilot hole of the main hole starts. After the ring, start the main hole steel frame support in the guide hole, bind the steel mesh, spray C25 concrete, break the guide hole vertical support spray concrete, unscrew the vertical support bolts, take out the vertical support, support the main hole steel frame, start three The construction method of the temporary inverted arch of the steps is to cyclically excavate in the direction of the entrance and the exit, and finally start the construction of the main hole to complete the process conversion; this construction method speeds up the excavation, reduces the difficulty of the workers' operation, reduces the safety risk, and realizes the turnover of materials at the same time. , saving materials and reducing construction costs.

Description

technical field [0001] The invention relates to the construction field of special geological inclined wells, in particular to a construction method of a detachable portal frame for expansive mudstone orthogonal inclined wells. Background technique [0002] Traditionally, the method of transitional small pilot tunnels is used in the construction of beams in China. After the construction of the inclined shaft reaches the junction with the side wall of the main tunnel, the body of the inclined shaft at the intersection is first reinforced, and then the construction of the beams is carried out after the reinforcement is completed. Starting from the intersection of the inclined shaft and the side wall of the main tunnel, a transitional small pilot tunnel is used to excavate into the body of the main tunnel, and the vault elevation of the main tunnel is reached at the center line of the tunnel main tunnel. However, the traditional small transitional pilot tunnel method is used for...

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Problems solved by technology

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a construction method of a detachable gantry in an expansive mudstone orthogonally inclined shaft, which effectively solves the problem of the narrow and poor integrity of the traditional method of construction. , the problem of high construction risk

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