Self flush type depressurization well for constructional engineering foundation pit dewatering

Abstract

The invention discloses a self flush type depressurization well for constructional engineering foundation pit dewatering. The self flush type depressurization well comprises a well pipe and a high-pressure water pipe, wherein circular holes are uniformly formed in the side wall of the well pipe; the well pipe is wrapped with a 60-mesh nylon filter screen; an opening is formed in the side wall of the well pipe; a conical part is arranged at the lower end of the well pipe; an opening is formed in the lower end of the conical part; the high-pressure water pipe is formed by connecting a plastic water inlet pipe and a steel water inlet pipe; the steel water inlet pipe penetrates out of the opening in the lower end of the conical part from the internal part of the well pipe; and a blade is welded at the part, penetrating out of the opening in the lower end of the conical part, of the steel water inlet pipe. Compared with the prior art, the self flush type depressurization well for constructional engineering foundation pit dewatering has the following advantages: when the ground elevation is lower than the water level of confined water or pit bottom sudden surging takes place before well-digging construction, filter material can be filled when wellhole drilling reaches design depth and the wellhole is cleared, so that the technologies of pulling out a drill pipe and mounting the well pipe are eliminated, and the situation that the well pipe cannot be mounted in the wellhole due to hole collapse is avoided; and the self flush type depressurization well is simple in structure, convenient to use, high in practicality, low in cost, convenient to operate, and high in safety and adaptability, and has better application prospect.

Description

technical field [0001] The invention relates to a pressure-relief well, in particular to a self-flushing type pressure-relief well for dewatering a construction engineering foundation pit. Background technique [0002] Confined water dewatering is an effective means to reduce the pressure of the confined water head and ensure the safety of foundation pits during the excavation process of construction engineering foundation pits. At present, in order to solve the problem of sudden surge at the bottom of the pit caused by excessive pressure of the confined water head during the excavation of the foundation pit, the construction of a depressurization well to extract the confined water has become an effective way to reduce the pressure of the confined water head during the excavation of the foundation pit. means. It can effectively reduce the head pressure of the confined water, so that during the construction of the foundation pit, the head of the confined water is guaranteed ...

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Problems solved by technology

[0003] However, the above situation can only be completed when the ground elevation is higher than the confined water level before the well drilling construction. When the ground elevation is lower than the confined water level before the well drilling construction, use the positive circulation water drilling method or reverse circulation During the process of drilling out the wellbore by the water drilling method, under the pressure of the confined water, the soil particles (especially sand or silt particles) mixed with the confined water enter the wellbore from the surrounding soil and flow out from the upper mouth of the wellbore, causing the wellbore Collapsed hole, after the drill pipe is pulled out, the well pipe cannot be installed in the well hole, and the depressurization well drilling construction cannot be completed

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