Tunnel portal temporary water stop structure for tunnel construction

Abstract

The invention relates to the field of tunnel construction structures, in particular to a tunnel portal temporary water stop structure for tunnel construction. The tunnel portal temporary water stop structure comprises an outer ring; the rear end face of the outer ring is fixedly connected with an inclined ring; the center axis of the inclined ring intersects with the center axis of the outer ring; the part, close to the upper end, of the inclined ring is fixedly connected with the rear end face of the outer ring; the lower end part of the inclined ring is far away from the outer ring; the interval between the inclined ring and the outer ring is movably filled with a plurality of filling plates; the adjacent filling plates are spliced through a first telescopic mechanism; the inner walls of the plurality of filling plates are jointly and fixedly connected with an inner rubber plate, and the upper end face of the inner rubber plate is provided with an inclined slope surface; a sealing rubber ring extends out of the position, corresponding to the inner wall of the outer ring, of a port in the front end of the inner rubber plate; and obstructing blocks distributed in a circle are movably embedded into the outer surface of the outer ring. In the entering process of a shield tunneling machine, pressure is effectively relieved, water seepage is effectively prevented, and meanwhile the process of pulling out the shield tunneling machine is smooth.

Description

technical field [0001] The invention relates to the field of tunnel construction structures, in particular to a temporary water stop structure for tunnel construction. Background technique [0002] In shield tunneling construction, the process of the shield machine entering and exiting the construction stratum through the portal is called shield tunnel initiation and shield tunnel reception respectively. Generally, in order to ensure that the shield machine passes through the portal smoothly, the diameter of the portal should be larger than the shield tunnel. Mechanism diameter. When the water content of the ground within the construction area is relatively high, the ground is disturbed during the starting and receiving process of the shield machine, and it is easy to form a groundwater seepage channel between the portal and the shell of the shield machine, and the outflow of groundwater mixed with mud and sand will induce Accidents such as water gushing and sand gushing, i...

AI Technical Summary

Problems solved by technology

The commonly used water-stopping method in the industry is to fix the rubber cord and the hinge plate on the steel ring of the door. The hinge plate is set outside the rubber cord. Disadvantages: As the water pressure and water are affected by gravity, the lower half of the entire structure bears too much pressure and is prone to damage. It is difficult to ensure the tightness between the rubber cord and the outer surface of the shield machine. There are problems in the arrangement of the rubber cord. The phenomenon of installation deviation at a certain position caused water seepage in the later stage, and there was water seepage in the soil between the periphery of the rubber cord and the cave wall during the entry of the shield machine

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