Construction method for holing and welling of shield machine

Abstract

The invention belongs to the underground engineering field, and particularly relates to a construction method for holing and welling of a shield machine. The method mainly aims to the phenomenon that gushing water sand leakage is easy to occur in a soil body outside a hole when in holing of the shield machine. The construction method comprises the following steps: dismantling a seal door on the wall of a well before the shield machine holes; arranging a cavity body adopting an upper and lower splicing structure on the ground of a working well and clinging the cavity body on the wall of the working well; filling sandy soil and / or water in the cavity body; adjusting the pressure of the sandy soil and / or water in the cavity body into the same pressure with the periphery stratum of the holing opening through a pressurizer arranged on the cavity body; and starting the shield machine to tunnel forwards until the shield machine completely departs from the tunnel and enters the cavity body. The construction method has the advantages that the security coefficient of holing of the shield machine is high; the phenomenon that the gushing water sand leakage cannot occur in a soil body outside the hole can be ensured; and the construction method is simple and rapid when the shield machine wells and the needed construction equipment is simple in structure and convenient in manufacturing and transportation.

Description

technical field [0001] The invention belongs to the field of underground engineering, and in particular relates to a construction method for a shield machine to enter a hole and go up a well. Background technique [0002] During tunnel excavation construction, the shield machine is generally advanced from one working well to another. The shield machine starts from the working well and enters the soil layer through the reserved hole circle, that is, the shield machine exits the hole, and then enters the soil layer from the soil layer. The medium advances into another reserved working well, which is the tunneling of the shield machine. Usually when the shield machine enters the hole, the sealing door is removed. If the soil quality in the shield tunneling area is poor or the sand content is high, the soil outside the well cannot stand on its own, and the sealing device of the hole ring in the well cannot block the soil outside the hole. , so the soil outside the hole enters t...

AI Technical Summary

Problems solved by technology

Since the above foundation reinforcement techniques have certain limitations, complicated construction techniques, and expensive construction equipment, those skilled in the art are in urgent need of an invention that can ensure the smooth and safe entry of the shield machine into the tunnel and well, and ensure that the soil at the entrance of the tunnel can Construction method for self-supporting and preventing soil loss when the shield machine enters the hole

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