Well sealing method for relief well on large bottom plate of foundation pit

Abstract

The invention discloses a well sealing method for a relief well on a large bottom plate of a foundation pit. The method comprises the following steps of 1.1, making preparatory work before well sealing and 1.2, sealing the relief well. The step 1.1 comprises the processes of lowering the water level of the foundation pit, excavating the foundation pit, completing a plurality of concrete supports of the foundation pit, gradually cutting off a well pipe of the relief well above an excavation surface, and continuously keeping a water pumping work condition of the relief well. The step 1.2 comprises the processes of making a well sealing valve assembly, installing the well sealing valve assembly, performing well sealing pouring twice and performing mortar closing-up. According to the invention, a large-diameter well mouth is changed into a small-diameter well mouth through the well sealing valve assembly, the last moment of well sealing of the relief well of the deep foundation pit is completed in an opening or closing state, an original dynamic well sealing and closing-up process is instantly changed into a static process, and an underground water source is cut off neatly. The method has the advantages of being simple in process, clear in operation procedure, greatly reduced in construction difficulty and good in well sealing effect.

Description

technical field [0001] The invention relates to the technical field of large-scale building foundation construction, in particular to a well sealing method for a relief well on a large floor of a foundation pit. Background technique [0002] With the rapid development of urban construction, the number of large-scale buildings is increasing rapidly. During the construction of large-scale buildings, from the excavation of deep foundation pits to the completion of deep foundation pits, the underground dewatering process through dewatering wells has been accompanied All the time, when the large concrete floor of the deep foundation pit is completed, the function of the dewatering well is converted into a relief well, and the key point is to seal the relief well. There are many well methods, but the methods with simple technology and good sealing effect are rare, especially for the sealing of deep foundation pit relief wells. Since the groundwater keeps rising during the sealing ...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of urban construction, the number of large-scale buildings is increasing rapidly. During the construction of large-scale buildings, from the excavation of deep foundation pits to the completion of deep foundation pits, the underground dewatering process through dewatering wells has been accompanied All the time, when the large concrete floor of the deep foundation pit is completed, the function of the dewatering well is converted into a relief well, and the key point is to seal the relief well. There are many well methods, but the methods with simple technology and good sealing effect are rare, especially for the sealing of deep foundation pit relief wells. Since the groundwater keeps rising during the sealing process, the closing process of the well sealing is a dynamic process. , the ubiquitous defects of complex construction technology, difficult construction and unsatisfactory sealing effect

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