A poor foundation reinforcement system and a reinforcement method based on underground concealed arch structures are provided. The system and the method belong to the technical field of poor foundation treatment. The reinforcement system includes multiple columns of pile foundations arranged along a bridge direction. Multiple arch sheets are set in parallel between each two adjacent columns of pile foundations. Each arch sheet includes multiple high-pressure rotary jet piles arranged along the bridge. Each two adjacent arch sheets of the multiple arch sheets are connected by a micro-bending slab disposed on the two adjacent arch sheets, the multiple arch sheets are connected by the micro-bending slabs to together form an arch ring, and a construction joint is disposed between each two adjacent micro-bending slabs of the micro-bending slabs.

A poor foundation reinforcement system and a reinforcement method based on underground concealed arch structures are provided. The system and the method belong to the technical field of poor foundation treatment. The reinforcement system includes multiple columns of pile foundations arranged along a bridge direction. Multiple arch sheets are set in parallel between each two adjacent columns of pile foundations. Each arch sheet includes multiple high-pressure rotary jet piles arranged along the bridge. Each two adjacent arch sheets of the multiple arch sheets are connected by a micro-bending slab disposed on the two adjacent arch sheets, the multiple arch sheets are connected by the micro-bending slabs to together form an arch ring, and a construction joint is disposed between each two adjacent micro-bending slabs of the micro-bending slabs.

A poor foundation reinforcement system and a reinforcement method based on underground concealed arch structures are provided. The system and the method belong to the technical field of poor foundation treatment. The reinforcement system includes multiple columns of pile foundations arranged along a bridge direction. Multiple arch sheets are set in parallel between each two adjacent columns of pile foundations. Each arch sheet includes multiple high-pressure rotary jet piles arranged along the bridge. Each two adjacent arch sheets of the multiple arch sheets are connected by a micro-bending slab disposed on the two adjacent arch sheets, the multiple arch sheets are connected by the micro-bending slabs to together form an arch ring, and a construction joint is disposed between each two adjacent micro-bending slabs of the micro-bending slabs.

A poor foundation reinforcement system and a reinforcement method based on underground concealed arch structures are provided. The system and the method belong to the technical field of poor foundation treatment. The reinforcement system includes multiple columns of pile foundations arranged along a bridge direction. Multiple arch sheets are set in parallel between each two adjacent columns of pile foundations. Each arch sheet includes multiple high-pressure rotary jet piles arranged along the bridge. Each two adjacent arch sheets of the multiple arch sheets are connected by a micro-bending slab disposed on the two adjacent arch sheets, the multiple arch sheets are connected by the micro-bending slabs to together form an arch ring, and a construction joint is disposed between each two adjacent micro-bending slabs of the micro-bending slabs.

The present application provides a water stopping device of suspension and sliding type, including: a water stop; a first end thereof is connected with a first joint segment and a second end thereof is connected with a second joint segment to form a water stopping cavity; at least one first rod; a first end thereof is connected with the first joint segment and a second end thereof is movably connected with the second joint segment; and at least one first hanging structure, connected with the water stop and the corresponding first rod, and slidably provided on the corresponding first rod. The water stopping device can be applied in joint construction of an immersed tunnel.

The present application provides a water stopping device of suspension and sliding type, including: a water stop; a first end thereof is connected with a first joint segment and a second end thereof is connected with a second joint segment to form a water stopping cavity; at least one first rod; a first end thereof is connected with the first joint segment and a second end thereof is movably connected with the second joint segment; and at least one first hanging structure, connected with the water stop and the corresponding first rod, and slidably provided on the corresponding first rod. The water stopping device can be applied in joint construction of an immersed tunnel.

The present invention relates to: an underwater tunnel construction method for constructing an underwater tunnel by successively coupling new tunnel modules to the end of an already-constructed body part while moving a launching girder forward, wherein the new tunnel modules are sunk up to the opening of the launching girder and then introduced into the launching girder by using guide cables; and an underwater tunnel constructed by the construction method.

The present invention relates to: an underwater tunnel construction method for constructing an underwater tunnel by successively coupling new tunnel modules to the end of an already-constructed body part while moving a launching girder forward, wherein the new tunnel modules are sunk up to the opening of the launching girder and then introduced into the launching girder by using guide cables; and an underwater tunnel constructed by the construction method.

A method for sealing a post-cast strip in a foundation with no gap includes the following steps: mounting steel plates, horizontal pipes and vertical pipes cooperatively layer by layer in a post-cast strip, respectively, such that the upper open end of each vertical pipe protrudes from the ground through the post-cast strip; pouring grout into the post-cast strip from the top of the post-cast strip after the end of the settlement of the foundation, and carrying out high-pressure grouting into the vertical pipe using grouting equipment simultaneously; delivering the sealing grout poured into the vertical pipe to the horizontal pipes, such that the sealing grout overflows from the grout outlets of the horizontal pipes to densely fill up existing gaps; and cutting off the portion of the vertical pipe above the ground after the post-cast strip is completely sealed, and levelling the top of the cut-off vertical pipe with concrete.

A method for sealing a post-cast strip in a foundation with no gap includes the following steps: mounting steel plates, horizontal pipes and vertical pipes cooperatively layer by layer in a post-cast strip, respectively, such that the upper open end of each vertical pipe protrudes from the ground through the post-cast strip; pouring grout into the post-cast strip from the top of the post-cast strip after the end of the settlement of the foundation, and carrying out high-pressure grouting into the vertical pipe using grouting equipment simultaneously; delivering the sealing grout poured into the vertical pipe to the horizontal pipes, such that the sealing grout overflows from the grout outlets of the horizontal pipes to densely fill up existing gaps; and cutting off the portion of the vertical pipe above the ground after the post-cast strip is completely sealed, and levelling the top of the cut-off vertical pipe with concrete.