Leak detection device for underground diaphragm wall and construction method of leak detection device

Abstract

The invention provides a leak detection device for an underground diaphragm wall, and a construction method of the leak detection device. The detection device comprises a composite water level monitoring well at a seam of the diaphragm wall to be detected; a wellhole of the monitoring well is internally provided with a plurality of well tubes; the bottom ends of the well tubes penetrate to-be-detected confined water layers in different depths respectively; the to-be-detected confined water layers are covered by filter materials; and the filter materials of the to-be-detected confined water layers are separated by clay balls. The construction method comprises the steps of constructing at least one wellhole, placing the first well tube in the wellhole, allowing the first well tube to penetrate the undermost confined water layer, backfilling the filter material and the clay balls into the wellhole, placing the second well tube in the wellhole, allowing the second well tube to penetrate the second confined water layer, backfilling the filter material and the clay balls into the wellhole, placing the Nth well tube in the wellhole according to the number of the required detection layers in sequence, allowing the Nth well tube to penetrate the uppermost confined water layer, backfilling the filter material and the clay balls, placing the (N+1)th well tube in the wellhole finally for monitoring a shallow water level, and backfilling the filter material to the ground level. Water level situations of the confined water layers can be reflected really.

Description

technical field [0001] The invention relates to a leakage detection device of an underground diaphragm wall and a construction method thereof, in particular to a device for detecting leakage of an underground diaphragm wall of a deep foundation pit enclosure structure in soft soil areas and a construction method thereof. Background technique [0002] The construction of the deep foundation pit enclosure structure and the later construction in the foundation pit are greatly affected by the pressurized water, which is prone to leakage, and in serious cases, there will be dangers such as piping and enclosure structure instability. It is very important for the safe construction of the foundation pit to find out the danger in advance, determine the location of the leakage, control the hidden danger in advance and do a good job of strengthening the foundation pit. With so many underground projects being constructed in typical water-rich soft soil areas, the safe construction of fo...

AI Technical Summary

Problems solved by technology

However, due to factors such as the construction technology of the underground diaphragm wall, the form of joints, and the influence of the stratum environment, there are more or less hidden dangers of leakage during the excavation process of the wall, and the safety risk of foundation pit excavation always exists.

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