Construction method for long-distance high-lifting underground excavation tunnel

Abstract

The invention discloses a construction method for a long-distance high-lifting underground excavation tunnel. The construction method for the long-distance high-lifting underground excavation tunnel comprises the steps of S1, lifting construction of a first section of the underground excavation tunnel, and S2, lifting construction of a second section of the underground tunnel, wherein in the S1, the underground excavation section is excavated upwards to form a first-section finishing step, the design gradient of the first-section finishing step is 30 degrees, the surface of the first-section finishing step is provided with a first section-slope, and the included angle between the first section-slope and the horizontal plane is 12 degrees; in the S2, the underground excavation section is excavated downwards to form a second-section finishing step, the designed gradient of the second-section finishing step is 30 degrees, the surface of the second-section finishing step is provided with a second-section slope, and the included angle between the second-section slope and the horizontal plane is 12 degrees. According to the construction method for the long-distance high-lifting underground excavation tunnel, excavation is performed in a mode of combining upward excavation and downward excavation, so that the deslagging speed can be effectively accelerated on the premise of ensuring the construction safety, and the process flow operation is orderly performed, so that the construction risk is reduced, and the construction period is shortened.

Description

technical field [0001] The invention relates to the technical field of subway tunnel construction, in particular to a construction method for long-distance high-elevation underground excavation tunnels. Background technique [0002] With the continuous acceleration of the urbanization process, urban rail transit has developed rapidly, and urban rail transit has become an inseparable and important part of urban traffic. However, with the development of the city, the urban building space is gradually reduced, and the open-cut station is replaced by the underground excavation station. As an important traffic channel, the entrance and exit are also transformed from full-cut and open-cut to open-cut + cover-cut construction with greater risk and smaller space. . The entrances and exits of stations are generally only carried out in a small space by undercut construction. Although the single use of undercut is low in construction risk, due to the impact of the open cut section, th...

AI Technical Summary

Problems solved by technology

The entrances and exits of stations are generally only carried out in a narrow space. Although the construction risk is small when using a single use of the down excavation, due to the impact of the open cut section, the general construction period is longer and the existing structure is greatly disturbed.

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