Construction method of large-diameter precipitation well in subway mined tunnel

Abstract

The invention belongs to the field of subway construction. In order to solve the problem that during urban subway excavation, seepage of an excavated tunnel face affects the construction of a mining project since there are no conditions for precipitation well construction due to surface ambient restraints, the invention provides a construction method of a large-diameter precipitation well in a subway mined tunnel; the method comprises: excavating a precipitation guide hole parallel to a mined tunnel, constructing a large-diameter precipitation well in the precipitation guide hole, discharging accumulated water in the precipitation well to a drain pipe through a water discharge pipeline, an intra-tunnel water collection chamber and a surface collection pit, and mining construction of the tunnel having no seepage at the tunnel face is achieved. The construction scheme focused on precipitation is adopted herein; by reasonably selecting the type of drill rig in connection with the drill rig and related conditions, the guide hole is set; a shaft and a passage space are utilized to make a drill rig lifting scheme; intra-tunnel precipitation and drainage are finally performed; accordingly, precipitation effect is good, and the mining project in the range can be conducted normally.

Description

technical field [0001] The invention belongs to the field of subway construction, and in particular relates to a method for constructing a large-diameter dewatering well in a underground excavation tunnel of a subway. Background technique [0002] The construction of urban subways often needs to pass through special areas such as politically sensitive areas and economically prosperous areas. To build subways in such areas, in order to reduce the impact of construction on political and economic activities, underground excavation methods are often used for construction. The construction of subway underground excavation requires no water operation, therefore, dewatering wells are used to drain the groundwater before construction. The existing construction method of precipitation wells is to drill down from the surface to form wells. In some special areas, affected by the ground environment, the construction of precipitation wells is unconditionally carried out on the surface. ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that during the excavation process of the urban subway, due to the constraints of the ground environment, the construction of the dewatering well on the surface is unconditional, resulting in water seepage on the excavation face and affecting the construction of the underground excavation project, and further provides a subway underground excavation tunnel hole Construction Method of Inner Large Diameter Dewatering Well

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