Shield tail leak plugging device in shield construction

Abstract

A shield tail plugging device for shield construction, comprising a shield tail and a shield segment of a shield machine, wherein a water stop ring is provided at the end of the shield segment, the water stop ring having an L-shaped cross section, and its two inner sides respectively covering the end of the shield segment and the inner side of the shield segment; water stop rubber is provided on the inner sides of the water stop ring, and a thrust cylinder capable of pushing the water stop ring toward the end of the shield segment and a push cylinder capable of pushing the water stop ring outward are provided on the outer sides of the water stop ring; a plurality of grouting ports are provided on the water stop ring for internal injection of polyurethane water stop and injection of double liquid slurry for backfilling. When the shield tail leaks, the present invention can quickly perform full-ring sealing and backfill the leaking area to ensure that no more water leaks. It has the advantages of simple structure and easy operation, can effectively improve the safety during shield construction, reduce the losses caused by shield tail leakage, and is beneficial to the development of my country's shield construction technology.

Description

Technical Field

[0001] The invention relates to a device for plugging water leakage, in particular to a device used in shield tunnel construction, which can quickly plug water leakage at the shield tail. Background Art

[0002] During shield construction, failure of the tail brush can easily cause water leakage. Small leaks can be sealed by adding grease and polyurethane to the tail. When the shield machine is located in a water-rich area and the tail brush deforms to a certain degree, the injected polyurethane is quickly carried away by the gushing water, preventing it from foaming and providing a water barrier. In this case, the water flow channel must be sealed first. Conventional leak-proofing methods can only block a portion of the flow. Because the tail and segments form a circumferential channel, blocking a portion of the channel will create additional leaks. Summary of the Invention

[0003] The purpose of the present invention is to address the defects and shortcomings of the above-mentioned prior art and to provide people with a shield tail leakage plugging device that can quickly perform full-ring sealing when the shield tail leaks.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: the shield tail leak-proof device in the shield construction includes the shield tail and shield segment of the shield machine, and the end of the shield segment is provided with a water stop ring. The cross-section of the water stop ring is L-shaped, and its two inner sides are respectively covered with the end of the shield segment and the inner side of the shield segment; water stop rubber is provided on the two inner sides of the water stop ring, and a thrust cylinder that can push the water stop ring to the end of the shield segment and a pushing cylinder that can push the water stop ring outward are provided on the two outer sides of the water stop ring; a plurality of grouting ports are opened on the water stop ring for internal injection of polyurethane water stop and injection of double liquid slurry for backfilling.

[0005] The water stop ring is composed of six ring-shaped water stop strips evenly distributed, and two adjacent water stop strips are connected by connecting heads and bolts.

[0006] A sealing gasket is provided at the connection between two adjacent water stop strips.

[0007] A connector is provided in the middle of the shield tail, and the push oil cylinders are all installed on the connector.

[0008] The push oil cylinders are radially installed on the connector.

[0009] When the shield tail leaks, the present invention can quickly seal the entire ring and backfill the leaking area to ensure that there is no more leakage. It has the advantages of simple structure and easy operation, can effectively improve the safety during shield construction, reduce the losses caused by shield tail leakage, and is beneficial to the development of my country's shield construction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention.

[0011] Figure 2 It is a schematic diagram of the outer structure of the water stop ring of the present invention.

[0012] Figure 3 It is a schematic diagram of the inner structure of the water stop ring of the present invention. DETAILED DESCRIPTION

[0013] like Figure 1 、 Figure 2 、 Figure 3 As shown, the present invention is a shield tail plugging device used in shield construction, which includes a shield tail 1 and a shield segment 2 of a shield machine. A water stop ring 3 is provided at the end of the shield segment 2. The cross section of the water stop ring 3 is L-shaped, and its two inner sides respectively cover the end of the shield segment 2 and the inner side of the shield segment 2. Water stop rubber 4 is provided on the inner sides of the water stop ring 3, and a thrust cylinder 5 that can push the water stop ring 3 toward the end of the shield segment 2 and a thrust cylinder 6 that can push the water stop ring 3 outward are provided on the outer sides of the water stop ring 3. The thrust cylinder 5 is fixed to the shield tail 2 and can push the water stop ring 3 toward the end of the shield segment 2. After being squeezed and deformed, the water stop rubber 4 will fill the gap between the water stop ring 3 and the shield segment 2 to achieve the function of water blocking. The waterstop ring 3 consists of six evenly spaced ring-shaped waterstop strips 3.1. Adjacent waterstop strips 3.1 are connected by connectors 3.2 and bolts 3.3. The thrust cylinders 6 are radially mounted on connectors 8, pushing the waterstop strips 3.1 outward, ensuring their inner surfaces adhere tightly to the shield segments 2. Sealing gaskets 3.4 are installed at the junctions between adjacent waterstop strips 3.1 to prevent leakage.

[0014] The waterstop ring 3 is provided with multiple grouting ports 7, through which polyurethane can be injected. After the polyurethane foams, it can block the leak. After the leak is blocked, a double-liquid slurry is injected backfilling in the direction of the leak. This means that water glass and calcium chloride solution are alternately injected into the shield tail 1. The two solutions react rapidly to form silica gel and calcium silicate gel, which acts as a cement and fills the pores, thereby improving the strength and load-bearing capacity of the shield tail 1.

[0015] When the shield tail 1 leaks, the present invention can quickly seal the entire ring and backfill the leaking area to ensure that there is no more leakage. It has the advantages of simple structure and convenient operation, can effectively improve the safety during shield construction, reduce the losses caused by the leakage of the shield tail 1, and is beneficial to the development of my country's shield construction technology.

Claims

1. A shield tail leak plugging device for shield construction, comprising a shield tail (1) and a shield segment (2) of a shield machine, characterized in that The end of the shield segment (2) is provided with a water stop ring (3), the cross section of the water stop ring (3) is L-shaped, and its two inner sides respectively cover the end of the shield segment (2) and the inner side of the shield segment (2); water stop rubber (4) is provided on the inner sides of the water stop ring (3), and a thrust cylinder (5) capable of pushing the water stop ring (3) toward the end of the shield segment (2) and a push cylinder (6) capable of pushing the water stop ring (3) outward are provided on the outer sides of the water stop ring (3); a plurality of grouting ports (7) are opened on the water stop ring (3) for internal injection of polyurethane water stop and injection of double liquid slurry for backfilling.

2. The shield tail plugging device in shield construction according to claim 1 is characterized in that The water stop ring (3) is composed of six ring-shaped water stop strips (3.1) evenly distributed, and two adjacent water stop strips (3.1) are connected by a connector (3.2) and a bolt (3.3).

3. The shield tail plugging device in shield construction according to claim 2 is characterized in that A sealing gasket (3.4) is provided at the connection between two adjacent waterstop strips (3.1).

4. The shield tail leak plugging device in shield construction according to claim 1, 2 or 3, characterized in that A connector (8) is provided in the middle of the shield tail (1), and the push cylinders (6) are all mounted on the connector (8).

5. The shield tail plugging device in shield construction according to claim 4 is characterized in that The push cylinders (6) are radially mounted on the connector (8).

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