2 results about "Water stop" patented technology

The invention discloses a starting tunnel portal sealing structure for a slurry balance shield and a construction method. The sealing structure comprises a primary water stop ring, a secondary water stop ring, a tail end water stop ring and a tunnel portal ring, the tunnel portal ring is fixed to the outer side of a working well lining, the upper end of the primary water stop ring and the upper end of the secondary water stop ring are connected with the tunnel portal ring. The primary water stop ring is located at a tunnel portal, the secondary water stop ring is located on the outer side of the primary water stop ring, and the tail end water stop ring is located on the outer side of the secondary water stop ring and connected with the tail end of the tunnel portal ring. According to the starting tunnel portal sealing structure for the slurry balance shield and the construction method, two flexible closed bins are formed through the primary water stop ring and the secondary water stop ring, and the problems of water seepage and slurry leakage of a tunnel portal during starting of the slurry balance shield are solved to a certain degree; a third rigid closed bin is formed through the tail end water stop ring, a complete closed space is formed, and the problems of the water seepage and the slurry leakage of the tunnel portal are effectively solved.

The invention relates to a prefabricated dense rib cavity wallboard, and belongs to the technical field of foundation pit wallboards, the prefabricated dense rib cavity wallboard comprises a wall body, a cavity is formed in the wall body, a vacuum pump is fixed on the top of the wall body, and a plurality of water collecting pipes are fixed on the surface of the wall body; an expansion type water stop strip is fixed in the pipe wall of the water collecting pipe; a first switch moving plate is arranged on the water collecting pipe in a sliding mode in the axial direction. The first switch moving plate is fixedly connected with the expansion type water stop strip. A switch stator plate I which can be electrically contacted with the switch rotor plate I is fixed in the water collecting pipe; the first switch moving plate is electrically connected with the vacuum pump. The first switch stator plate can be electrically connected with the storage battery. The device has the effect of reacting accumulated water in the foundation pit.