Vertical shaft bottom sealing method for mechanized construction in tunnel

Abstract

The invention discloses a vertical shaft bottom sealing method for mechanized construction in a tunnel, and belongs to the technical field of tunnel vertical shaft bottom sealing construction. After apipe jacking machine in a vertical shaft carries out tunneling to a set depth, concrete is poured into the front of a cutterhead through a concrete guide pipe pre-arranged on a cutterhead center shaft on the pipe jacking machine, concrete is poured, meanwhile, the cutterhead is withdrawn before rotating, the withdrawing speed of the cutterhead is matched with the amount of poured concrete, and itis guaranteed that underground water does not destroy a mud film and rushes into a mud water bin of the pipe jacking machine; and the vertical shaft is constructed through a mechanical method, underground resources can be effectively saved, construction is completed in narrow working space, the lowest point of a tunnel longitudinal slope does not need to be considered for contact channels, setting can be achieved according to the maximum interval of specification requirements, and the number of the contact channels is reduced. In addition, the bottom sealing method can solve the problems thatdeep underground water pressure is large and bottom sealing is difficult, and guarantees are provided for construction of a built-in pump house.

Description

technical field [0001] The invention relates to a method for sealing the bottom of a shaft in a mechanized construction in a tunnel, and belongs to the technical field of tunnel shaft bottom sealing construction. Background technique [0002] After the mechanical method is used to construct the communication channel, it is planned to use the mechanical method to continue the construction of the wastewater pumping station. Due to the small inner diameter of the communication channel, the inner diameter clearance is within 3 meters. If the mechanized construction pump room is used in the communication channel, the excavation diameter of the pump room will hardly be more than 2 meters. Considering the thickness of the lining, the inner diameter clearance will be less than 1.5 meters In order to achieve the water storage required by the specification, it is necessary to dig very deep, occupying more underground space resources, and after digging to the bottom, the water pressure...

AI Technical Summary

Problems solved by technology

[0007] The existing built-in pump room has the following disadvantages. First, under the action of many factors such as long-term water level changes, alternating wet and dry, train cycle dynamic load, electrochemical corrosion, etc., the concrete of the ballast bed will crack, segregate, wash, and run off eventually. Possibility of causing damage; second, it takes up a lot of underground resources, and the deep underground water pressure is high, making it difficult to seal the back

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