Construction method for underground excavation station bottom part water-stopping

Abstract

The invention discloses a construction method for underground excavation station bottom part water-stopping. The construction method for underground excavation station bottom part water-stopping comprises the steps that construction preparation is conducted, pilot holes are constructed, chambering is conducted, mixing is conducted, a rotary jet grouting mixing pile is formed, a next rotary jet grouting mixing pile is constructed to be mutually occlusive to a pile body side part of the previous rotary jet grouting mixing pile, and a water-stop curtain is formed. An immersed tube method or a slurry wall protection method can be adopted in the construction of the pilot holes. The rotary jet grouting mixing pile at the previous pile position and the pilot hole at the next pile position can beconstructed simultaneously. According to the construction method for the underground excavation station bottom part water-stopping, the precipitation technology of a precipitation well is completely abandoned, groundwater resources are effectively protected, the problem of the station bottom part water-stopping in water-rich stratum is solved, at the same time, the construction method is simple and flexible, the construction period is short, the stratum is widely applicable, maneuverability is high, bearing capacity and anti-floating ability are extremely high, the construction impact is small, the underground environment is not harmed, and the construction method for underground excavation station bottom part water-stopping is of great engineering practical value for large-area and low-clearance underground excavation station construction with high underground water level.

Description

technical field [0001] The invention belongs to the field of underground space construction, in particular to a method for stopping water at the bottom of a submerged station. Background technique [0002] The PBA construction method is one of the construction methods commonly used in underground excavation stations. The initial stress system is composed of side piles, central columns, top beams, bottom beams, and top arches, which bear the load during the construction process. layer excavation soil. When the groundwater is relatively rich and the groundwater level is high, this construction method makes there no available water-resisting layer below the excavation range of the foundation pit, so a large area of ​​bottom sealing is required. [0003] At present, my country's subway construction is getting deeper and deeper, and groundwater has become one of the major problems faced by subway construction in many cities. For a long time, a large number of precipitation well...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for the water stop at the bottom of the underground excavation station, to solve the serious waste of water resources caused by the existing precipitation well technology for the bottom water stop of the underground excavation station, and at the same time, precipitation causes urban ground subsidence, road surface collapse, and building tilting secondary disasters, seriously affecting the technical problems of urban production and life

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