Slurry shield starting tunnel portal sealing structure and construction method thereof

Abstract

The invention discloses a slurry shield starting tunnel portal sealing structure and a construction method thereof. The sealing structure comprises two streaks of steel wire brushes, two streaks of cord fabric rubber plates and sealing slurry poured in three sealing cavities formed among the two streaks of steel wire brushes, the two streaks of cord fabric rubber plates and a shield tunneling machine and used for sealing a tunnel portal. The construction method comprises the steps of first, tunnel portal steel ring mounting, second, mounting of the first streak of steel wire brushes and the second streak of steel wire brushes, third, first extending steel ring mounting, fourth, mounting of the first steak of cord fabric rubber plates and a second extending steel ring, fifth, mounting of the second steak of cord fabric rubber plates and a fixing steel ring, sixth, cord fabric pressing plate assembly mounting, and seventh, contacting of the shield tunneling machine and the tunnel face, and sealing slurry pouring. The sealing effect can be improved greatly, the situation that slurry overflows when a shield tunneling machine starting slurry bin is built can be avoided effectively, the phenomenon that the slurry overflows, so that a soil body is unstable is avoided, the safety of slurry shield starting is guaranteed, and the construction method is simple in step, reasonable in design and short in construction period.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a mud-water shield starting portal sealing structure and a construction method suitable for sealing a portal at a relatively large buried depth. Background technique [0002] During the tunnel excavation construction of the shield machine, a sealing structure is generally installed at the starting opening of the tunnel shield construction. The sealing structure is to prevent the mud overflowing and soil instability during the construction of the shield machine. There are probably the following types of existing sealing structures: the first type uses a steel sleeve to seal, but the cost of the steel sleeve is high, the construction process is complicated, and it is inconvenient to construct; the second type uses a single cord rubber plate and For the seal of the hinge plate, due to the limited deformation recovery force of the cord rubber plate itself, the...

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Problems solved by technology

[0002]During the process of tunnel excavation, the shield machine is generally equipped with a sealing structure at the starting opening of the tunnel shield construction. The sealing structure is to prevent the shield from During the construction process of the machine, there are risks of mud overflowing at the portal and soil instability. The existing sealing structures are roughly as follows: the first one uses steel sleeves for sealing, but the cost of steel sleeves is high and the construction process is complicated. It is inconvenient for construction; the second one is to use a single cord rubber plate and hinge plate for sealing. Due to the limited deformation recovery force of the cord rubber plate itself, the deformation reset of the cord rubber plate is slow or incomplete, which makes the cord rubber plate The tightness between the end of the plate and the segment is not high, which leads to the poor sealing of the starting opening of the tunnel, which is prone to slurry leakage; the third is to use wire brushes, cord rubber plates and hinge plates to seal, so that An effective sealing cavity ca

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