Outside-pit rescue emergency well construction method

Abstract

The invention discloses an outside-pit rescue emergency well construction method, and relates to the technical field of infrastructure construction. The technical aim of foundation pit emergency rescue can be achieved. The method comprises the steps that a protection casing is tripped in a well hole, and the protection casing is used for forming supporting on the wall of the well hole; an emergency well tube is tripped into the protection casing, the middle tube segment of the emergency well tube is a dual-layer filter tube internally containing filter materials, and the upper tube segment andthe lower tube segment are waterproof solid tubes; the filter materials are backfilled into the annular space between the emergency well tube and the protection casing, and the top face of the backfilled filter materials is higher than the middle tube segment of the emergency well tube; the protection casing is lifted to the position which is higher than the middle tube segment of the emergency well tube and lower than the top face of the backfilled filter materials; a fixing clamp is used for fixing a well opening of the emergency well tube and the protection casing; and rescue water drawingcan be implemented; after emergency rescue is finished, the emergency well tube, and the protection casing are sequentially drawn out upwards; and the backfilled clay is used for filling and levelingup the well hole. The method can achieve rapid well sinking and rapid recycling.

Description

technical field [0001] The invention relates to infrastructure construction technology, in particular to a construction method for an emergency well outside a pit. Background technique [0002] The problem of groundwater, especially confined water, has become a frequent challenge for subway construction foundation pit projects. Groundwater problems are complex, technically difficult, and construction risks are high. Once a major safety and quality accident occurs, it is easy to cause serious property losses or casualties , if the emergency response is not timely, it may even endanger the public safety of the society. [0003] In recent years, there have been more and more foundation pit accidents caused by improper groundwater control. Some foundation pits urgently need to set up emergency dewatering wells outside the pit after accidents. However, due to many obstacles in the accident area, large soil disturbance, and large hydraulic gradient , it is difficult to complete t...

AI Technical Summary

Problems solved by technology

[0002] The problem of groundwater, especially confined water, has become a frequent challenge for subway construction foundation pit projects. Groundwater problems are complex, technically difficult, and construction risks are high. Once a major safety and quality accident occurs, it is easy to cause serious property losses or casualties , if the emergency response is not timely, it may even endanger public safety

[0003] In recent years, there have been more and more foundation pit accidents caused by improper groundwater control. Some foundation pits urgently need to set up emergency dewatering wells outside the pit after accidents. However, due to many obstacles in the accident area, large soil disturbance, and large hydraulic gradient , it is difficult to complete the well, which greatly delays the emergency rescue time; at the same time, when the emergency well is drilled outside the pit, considering the possible construction outside the pit, the emergency well may become an obstacle in the later construction; if the pumping sand content of the emergency well outside the pit is If it is not effectively controlled, it is easy to have obvious deformation risks around the well

Images