Method for controlling upward floating of pipe piece during shield machine air pushing through mining tunnel

Abstract

The invention discloses a method for controlling the upward floating of a pipe piece during shield machine air pushing through a mining tunnel. The method comprises the following steps: 1) arranging one or a plurality of position-limiting matters at the upper end of the mining tunnel at intervals so as to limit the upward floating amount of the pipe piece; 2) arranging water collecting wells in the mining tunnel at intervals, and pumping water before a nose of the shield machine arrives so as to reduce the water amount in the mining tunnel; 3) arranging openings in the positions of slurry filling holes at the waist part and the bottom part of the pipe piece at intervals for water drainage so as to reduce the water level at the back of the pipe piece after the pipe piece goes out of the shield tail of the shield machine; 4) performing secondary supplementary slurry filling after the pipe piece goes out of a vehicle frame; and 5) monitoring the stability of the pipe piece during the slurry filling process. By using the method, the upward floating of the pipe piece can be well controlled before the construction of the tunnel and in the construction late stage.

Description

technical field [0001] The invention relates to the field of underground excavation, in particular to a method for controlling the floating of segments when a shield machine is empty-pushed through a mining tunnel. Background technique [0002] With the continuous improvement of the development and utilization of urban underground space, the shield machine encountered a variety of complex areas during the construction process, such as soft and hard interbedded sections, sections with boulders and slightly weathered high-hardness rock sections, or encountered To obstacles such as building pile foundations, it is 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 w...

AI Technical Summary

Problems solved by technology

[0007] 1) When the grouting slurry cannot be solidified in time and there is no real-time monitoring during the construction process, if the segment floats up, measures cannot be taken in time to control the segment's floating up;

[0008] 2) When the segment floats up, no limit is set to limit its floating amount. When the segment floats up, its floating amount cannot be limited. The segment cannot be stable until it touches the top of the mine tunnel;

[0009] 3) Failure to release water during the grouting process will cause the water in the gap between the segment and the mine tunnel to not be discharged in time, resulting in a rise in the water level and an increase in the buoyancy of the segment, causing the segment to float up, which is also unfavorable to the stress on the segment;

[0010] 4) The compensation measures of the excavation axis are useless. When the segment floats up, the segment can only be stabilized when it touches the top of the mine tunnel. This amount of float is a fixed value;

[0011] 5) The measure is single, and the floating of the segments is difficult to control

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