Whole station water stop structure and construction method during construction of mined metro station

Abstract

The invention discloses a whole station water stop structure and construction method during construction of mined metro station. The water stop structure comprises fender piles in a mined station, water stop structures between the fender piles, and a water stop curtain at the bottom of a foundation pit, wherein the water stop structures between the fender piles and the fender piles co-act to forman excavated face side wall water stop structure, the water stop curtain at the bottom of the foundation pit is reinforced by soil body at the bottom of the foundation pit to form a water-resisting layer, and a buffer layer is arranged between water-resisting layer and a station bottom plate witout reinforcemeng. The excavated face side wall water stop structure is combined with the water stop curtain at the bottom of the foundation pit to form a box body, thereby preventing underground water from entering the excavation range. The interlocking pile and rotary jet grouting pile combined construction water stop method is adopted during the construction of the mined metro station to solve the water stopping problem of the whole station during the construction of the mined metro station, thereby avoiding the waste of underground water resources in the dewatering construction process of the subway, saving energy and protecting the environment on the premise of ensuring safety.

Description

【Technical field】: [0001] The invention belongs to the field of underground structures, and in particular relates to a water-stop structure and a construction method for the entire station during the construction of a subway underground excavation station. 【Background technique】: [0002] Underground excavation station construction, generally precipitation first, but in order to strengthen the management and protection of groundwater resources in Beijing, reduce the waste of water resources, and prevent related geological disasters, the Beijing Municipal Construction Commission and the Beijing Municipal Water Affairs Bureau issued the "Beijing Construction Project" in 2007. Construction Precipitation Management Measures, following the principles of protection priority, reasonable extraction, compensation for pumping water, and comprehensive utilization, supervises and manages construction precipitation. In order to further promote the comprehensive conservation and recycling...

AI Technical Summary

Problems solved by technology

It is technically feasible to apply the freezing method to large-scale underground space excavation and water sealing, but its cost is too high; the grouting water sealing curtain generally adopts deep hole grouting and high-pressure rotary grouting piles, and deep hole grouting is used in rich water It is difficult to guarantee the effect of pebble stratum; the structural method generally adopts underground diaphragm wall and occlusal piles, but the space of underground excavation station is limited, and the underground diaphragm wall is difficult to implement

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