Freeze detection method for underground obstacles

Abstract

The invention discloses a method for freezing, probing, and removing underground obstacles, which comprises the following steps: Step 1: constructing an obstacle-clearing well on the outside of the underground enclosure adjacent to both sides of the building, and the obstacle-clearing well is located on the axis of the shield tunneling section In the direction; Step 2: Use the freezing method to carry out horizontal freezing construction, and detect the obstacles within the crossing range of the shield machine; Step 3: Backfill the bored piles in the crossing range of the shield machine and at the same time clear the obstacle passage; Step 4: Gouging out the underground enclosure of the building adjacent to the shield machine crossing range and backfilling the obstacle-clearing passage at the same time; Step 5: The shield machine crosses the permafrost range, and performs thaw settlement compensation grouting; Step 6: Pull out The freezing tube inside the door ring, stop freezing; Step 7: Block the freezing hole. The invention can solve the construction conditions under the track floor of the subway station in operation that cannot be removed by conventional means, and detect possible obstacles and perform directional removal, so as to achieve risk-free crossing of the section shield.

Description

technical field [0001] The invention relates to an underground structure construction technology, in particular to a method for detecting and removing underground obstacles by freezing. Background technique [0002] With the large-scale development of Shanghai's urban subway planning, the underground rail transit network has been continuously enlarged and complicated, and it may pass through existing concrete structures such as bridge pile foundations, underground pipelines, and underground building structures (or piles) in the city. Or close to produce continuous junctions, resulting in the construction of new subway lines, there may be obstacles that pose a risk to shield tunneling, but because these obstacles are located under the rail floor of the subway line station in operation, it cannot be used Conventional methods are used to detect and detect, but there is a lack of new detection methods to detect these possible obstacles and perform directional removal so that the...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for detecting and removing underground obstacles, which can solve the construction conditions that cannot be removed by conventional means under the rail floor of the subway station in operation, ascertain possible obstacles and solve the problem. Carry out directional clearing to achieve risk-free crossing of the interval shield

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