Duct piece floating resisting structure capable of passing through mine tunnel through shield empty pushing and construction method

Abstract

The invention discloses a duct piece floating resisting structure capable of passing through a mine tunnel through shield empty pushing and a construction method. The duct piece floating resisting structure comprises a grouting bag body arranged between a mine tunnel primary lining and a shield duct piece, wherein the open end of the grouting bag body extends out of a grouting hole of the shield duct piece; a dual-liquid grouting duct member with threads can be screwed into the grouting hole of the shield duct piece; cement slurry and water glass are simultaneously injected into the grouting bag body through the dual-liquid grouting duct member; a cloth bag can restrain a range of formation of a floating resisting structural body, so that the block-shaped floating resisting structural body which has certain intensity and with which a gap between the mine tunnel primary lining and the shield duct piece is filled can be effectively formed; the gap between the mine tunnel primary lining and the shield duct piece is filled with the floating resisting structural body in a block-shaped surface contact manner, so that cracking and deformation of the duct piece due to local stress concentration can be effectively prevented; meanwhile, three floating resisting structural bodies which are arranged in a spacing manner at the upper part of the shield duct piece are relatively large in range, so that a tunnel can be well wrapped and tightened, and displacement and deformation of the shield duct piece are completely limited.

Description

technical field [0001] The invention relates to the technical field of shield tunnel construction, in particular to a segment anti-floating structure and a construction method for a shield tunnel pushed through a mining method tunnel. Background technique [0002] In order to ensure the smooth advancement of the shield tunnel, when the tunnel body needs to pass through extremely hard rock and the length is long, the mining method is generally used to excavate first. Shield empty push. After the construction of the shield tunnel through the mining method is completed, there is usually a gap of about 200mm between the shield segment and the primary lining of the mining tunnel. When the gap is gradually filled with water or the segment is grouted, the upper part of the segment is not Therefore, the segment will float up. Since the assembled shield segment is composed of different lining blocks connected by bolts, when the buoyancy force is large and the segment floats up, the ...

AI Technical Summary

Problems solved by technology

[0007] 3. Due to the error in the construction of the initial lining of the mining tunnel, the distance between the segment and the initial lining of the mining tunnel cannot be exactly 200mm. Therefore, there is no tight contact between the front end of the steel column and the initial lining of the mining tunnel In actual construction, it is often necessary to adjust the length of the steel column by measuring the actual distance between the segment and the initial lining of the mine tunnel, which causes great inconvenience to the construction. Therefore, the bolts cannot be mass-produced, which affects the construction progress.

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