Reinforcement method for combined part of shield tunnel and mining-method tunnel

Abstract

The invention discloses a reinforcement method for a combined part of a shield tunnel and a mining-method tunnel. The reinforcement method is used for using a shield machine to propel and enter the mining-method tunnel and comprises the following steps of: 1) primarily spraying concrete on a working face of the mining-method tunnel so as to prevent local collapse of the tunnel; 2) horizontally placing gratings at the positions of end walls of the mining-method tunnel and spraying the concrete after being fixed; 3) adopting a plurality of grouting pipes for injecting slurry at the end walls of the mining-method tunnel so as to carry out reinforcement; and 4) adopting plain concrete to block the full cross sections at the two end walls of the mining-method tunnel and the shield tunnel.

Description

technical field [0001] The invention relates to the technical field of underground excavation, in particular to a method for reinforcing the junction of a shield tunnel and a mining method tunnel. Background technique [0002] With the continuous improvement of the development and utilization of urban underground space, shield tunneling has encountered a variety of complex areas during construction, such as soft and hard interbedded sections, sections with boulders and slightly weathered high-hardness rock sections, or encountered Obstacles such as building pile foundations are difficult to construct by relying solely on shield tunneling at this time. For strata with a length of more than 100m and rock uniaxial compressive strength of more than 80MPa, there are no reports of successful cases of pure shield tunneling at home and abroad. For an interval tunnel, if the deep buried section in the middle encounters hard unweathered or slightly weathered rock strata, and the shal...

AI Technical Summary

Problems solved by technology

[0007] Nevertheless, the above method still has many deficiencies. For example, the shield machine advances to the sealing wall. If the sealing wall is not removed, the end wall will easily collapse and the soil will be lost. The risk is extremely high; if the soil in front is not reinforced, The water-stop effect is not good, and the soft ground is prone to landslides; after the landslide, it is difficult to rescue; the water-stop effect cannot be guaranteed by using embedded parts, and it is easy to cause water and soil loss, etc.

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