Construction method of foundation pit confined water inrushing emergency water-lowering well

A construction method and technology for confined water, applied in infrastructure engineering, construction, etc., can solve the problems of complex well closing procedures and high construction difficulty

Active Publication Date: 2010-04-07
SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

The completion of the dewatering well will cause groundwater to pour into the foundation pit. In addition, the well closure process is much more complicated, and the construction difficulty is much higher than that of ordinary depressurization wells.

Method used

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  • Construction method of foundation pit confined water inrushing emergency water-lowering well
  • Construction method of foundation pit confined water inrushing emergency water-lowering well
  • Construction method of foundation pit confined water inrushing emergency water-lowering well

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Embodiment Construction

[0026] The features of the present invention and other related features will be further described in detail below in conjunction with the accompanying drawings through embodiments, so as to facilitate the understanding of those skilled in the art:

[0027] attached Figure 1-7 The marks 1-11 represent: construction surface 1, dewatering well 2, steel casing 3, foundation pit bottom plate 4, bottom concrete top surface 5, steel casing outer ring water-stop steel plate 6, water-stop steel plate outer ring of dewatering well 6', steel casing cutting position 7, grouting pipe 8, well pipe cutting position 9, grouting top surface 10, welded iron plate 11.

[0028] attached figure 1 It is a structural schematic diagram of the emergency dewatering well set up after the pressurized water surge of the present invention, figure 2 It is a schematic diagram of the corresponding foundation pit construction soil layer structure. This embodiment is an emergency well construction process ...

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Abstract

The invention relates to underground engineering construction, in particular to a construction method of a foundation pit confined water inrushing emergency water-lowering well. The method comprises: drilling the emergency water-lowering well near the position wherein the inrushing of confined water happens by first drilling a steel protective casing in an overburden layer above a confined water bearing stratum and then drilling the water-lowering well in the steel protective casting, and after the well is drilled, operating the water-lowering well to reduce the water head of confined water; and after a cushion layer is constructed completely, preparing for well sealing by first pumping the water and silt residue between the steel protective casting and the well pipe, then welding a water retaining steel plate, cutting off the steel protective casting and the pipe well from top down according to preset steel protective casting and pipe well cutting off positions and finally sealing the pipe well after the initial setting of poured concrete, wherein the well pipe mouth and the protective casing mouth are sealed by welding iron plates.

Description

technical field [0001] The invention relates to underground engineering construction, in particular to a construction method for setting a dewatering well when a foundation pit surges under the action of pressurized water for emergency rescue. Background technique [0002] When there is a confined water soil layer at the bottom of the foundation pit engineering, with the further excavation of the foundation pit, when the pressure of the overlying soil layer cannot withstand the head pressure of the confined water, a burst of confined water will occur, seriously endangering the safety of the foundation pit . [0003] Under normal circumstances, in order to ensure the safety of foundation pit construction, a pressure-relief well will be built before construction, and the pressurized water head will be gradually reduced with the excavation of the foundation pit to ensure the safety of the foundation pit excavation process. However, if the excavation depth of the foundation pit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/10
Inventor 杨俊龙李波陈立生王洪新曹恒钊娄荣祥
Owner SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD
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