A shield tail sealing device for tunnel boring machine construction

Abstract

This utility model relates to the field of shield tunneling technology, and more specifically, to a tail-end sealing mechanism for shield tunneling. The rotating mechanism includes an operating block, a rotating screw, a nut, and a propulsion cylinder. The rotating screw passes through the operating block, with its two protruding ends connected to the nut. One end of the propulsion cylinder is connected to the side of the rotating screw, and the other end is fixedly connected to a fixing plate. The position of the sealing mechanism is adjusted by rotating the screw; once the position is determined, the nut is tightened to engage the sealing mechanism. This avoids the problem of wasting materials.

Description

Technical Field

[0001] This utility model relates to the field of shield tunneling technology, and more specifically, to a shield tail sealing device in shield tunneling. Background Technology

[0002] During tunnel boring machine (TBM) construction, tail brush failure can easily lead to water leakage at the tail of the shield. Minor leaks can be sealed by injecting tail grease and polyurethane. However, when the TBM is in a water-rich area and the tail brush is deformed to a certain extent, the injected polyurethane will be quickly carried away by the gushing water, failing to foam and effectively block water. In this case, it is necessary to seal the water flow channels first, as conventional sealing methods can only provide partial sealing. Since the tail of the shield and the tunnel lining segments form a circumferential channel, partial sealing will create other leakage channels.

[0003] Chinese utility model disclosure CN201922311909.X discloses a shield tail leak-stopping device for tunnel boring machine (TBM) construction. It includes the shield tail and shield segments of the TBM. A water-stop ring with an L-shaped cross-section is installed at the end of each shield segment, with its inner two sides covering the end and inner side of the shield segment, respectively. Water-stopping rubber is installed on the inner two sides of the water-stop ring, and a pushing cylinder is installed on the outer two sides of the water-stop ring to push it towards the end of the shield segment and to push it outwards. Multiple grouting ports are provided on the water-stop ring for internal polyurethane water-stopping and double-liquid grout backfilling. This utility model can quickly seal the entire shield tail leak and backfill the leaking area to ensure no further leakage. It has the advantages of simple structure and convenient operation, effectively improving the safety of TBM construction, reducing losses caused by shield tail leaks, and contributing to the development of TBM construction technology in my country. However, the water-stopping structure of this device is a complete circle, which results in a waste of materials. Summary of the Invention

[0004] This invention aims to overcome the problem that the water-stopping structure of the current device is a complete circle, which wastes materials, and provides a shield tail sealing device in shield tunneling construction that can solve the above problems.

[0005] A shield tail sealing device for shield tunneling includes a shield tail body, shield segments, a rotating mechanism, and a sealing mechanism. The rotating mechanism is located inside the shield tail body, and the sealing mechanism is located around the rotating mechanism. The sealing mechanism includes a fixing plate, a water-stopping plate, a push rod, a sliding rod, and a limiting block. The fixing plate is connected to the rotating mechanism and has an elongated hole. The sliding rod is fixedly mounted on the water-stopping plate and passes through the elongated hole. The limiting block is fixedly connected to the sliding rod. One end of the push rod is connected to the side of the water-stopping plate, and the other end of the push rod is connected to the inside of the shield tail body.

[0006] Furthermore, the rotating mechanism includes an operating block, a rotating screw, a nut, and a propulsion cylinder. The rotating screw passes through the operating block and its two exposed ends are connected to the nut. One end of the propulsion cylinder is connected to the side of the rotating screw, and the other end of the propulsion cylinder is fixedly connected to a fixed plate.

[0007] Furthermore, it also includes bolts, and a connecting plate is fixedly installed on the fixing plate. The connecting plate is connected to the other end of the propulsion cylinder by bolts.

[0008] Furthermore, the operating block has a first groove at both the top and bottom ends, and the rotating screw passes through the first groove.

[0009] Furthermore, a second groove is provided at both ends of the operating block, and the rotating screw is inserted through the second groove.

[0010] Furthermore, a connecting rod is fixedly installed at one end of the propulsion cylinder, and the connecting rod is fixedly connected to the rotating screw.

[0011] Furthermore, a fixed plate is fixedly installed inside the shield tail body, and the push rod is moved and fixedly installed on the fixed plate.

[0012] Furthermore, the fixing plate is a telescopic plate.

[0013] Furthermore, elongated holes are provided at both the top and bottom ends of the fixing plate.

[0014] Furthermore, the connecting rod is welded to the rotating screw.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. Compared to existing technologies, the shield tail sealing device of this utility model solves the problems existing in the prior art through the setting of the sealing mechanism. The rotating mechanism includes an operating block, a rotating screw, a nut, and a propulsion cylinder. The rotating screw passes through the operating block, and its two protruding ends are connected to the nut. One end of the propulsion cylinder is connected to the side of the rotating screw, and the other end of the propulsion cylinder is fixedly connected to a fixing plate. The position of the sealing mechanism is adjusted by rotating the screw. Once the position is determined, the nut is tightened to activate the sealing mechanism. This avoids the problem of wasting materials. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of the shield tail sealing device in shield tunneling construction according to this utility model.

[0019] Figure 2This is a schematic diagram of the overall structure of the rotating mechanism in this utility model.

[0020] Figure 3 This is a schematic diagram of the overall structure of the leak-stopping mechanism in this utility model.

[0021] In the diagram: 1. Tail shield body; 2. Shield segment; 3. Rotating mechanism; 301. Operating block; 302. First groove; 303. Second groove; 304. Rotating screw; 305. Nut; 306. Connecting rod; 307. Propulsion cylinder; 4. Leak-sealing mechanism; 401. Fixing plate; 402. Water-stopping plate; 403. Push rod; 404. Long hole; 405. Sliding rod; 406. Limiting block; 407. Connecting plate; 408. Bolt; 5. Fixing plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1 As shown, the shield tail sealing device in this embodiment includes a shield tail body 1, a shield segment 2, a rotating mechanism 3 and a sealing mechanism 4. The rotating mechanism 3 is located inside the shield tail body 1, and the sealing device is located around the rotating mechanism 3.

[0024] In this utility model, such as Figure 2 As shown, the rotating mechanism 3 includes an operating block 301, a rotating screw 304, a nut 305, and a propulsion cylinder 307. The rotating screw 304 passes through the operating block 301, and its two protruding ends are connected to the nut 305. One end of the propulsion cylinder 307 is connected to the side of the rotating screw 304, and a connecting rod 306 is welded to one end of the propulsion cylinder 307. The connecting rod 306 is welded to the rotating screw 304, and the other end of the propulsion cylinder 307 is connected to the fixing plate 401. The operating block 301 has first grooves 302 at both its upper and lower ends, and the rotating screw 304 passes through and is disposed within the first grooves 302. The operating block 301 also has second grooves 303 at both its left and right ends, and the rotating screw 304 passes through and is disposed within the second grooves 303.

[0025] In this utility model, such as Figure 3As shown, the leak-stopping mechanism 4 is located around the rotating mechanism 3. The leak-stopping mechanism 4 includes a fixing plate 401, a water-stopping plate 402, a push rod 403, a sliding rod 405, and a limiting block 406. The fixing plate 401 is connected to the rotating mechanism 3. A connecting plate 407 is welded onto the fixing plate 401. The connecting plate 407 is connected to the other end of the propulsion cylinder 307 by bolts 408. Both the upper and lower ends of the fixing plate 401 are provided with elongated holes 404. The sliding rod 405 is welded onto the side of the water-stopping plate 402 near the fixing plate 401 and passes through the elongated holes 404. The limiting block 406 is welded to the sliding rod 405. One end of the push rod 403 is welded to the side of the water-stopping plate 402, and the other end of the push rod 403 is connected to the inside of the shield tail body 1. A fixing plate 5 is welded inside the shield tail body 1, and the push rod 403 is mounted on the fixing plate 5. The fixing plate 5 is a telescopic plate.

[0026] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A shield tail sealing device for shield tunneling, characterized in that: The shield includes a tailstock body (1), shield segments (2), a rotating mechanism (3), and a leak-sealing mechanism. The rotating mechanism (3) is located inside the tailstock body (1), and the leak-sealing mechanism (4) is located around the rotating mechanism (3). The leak-sealing mechanism (4) includes a fixing plate (401), a water-stopping plate (402), a push rod (403), a sliding rod (405), and a limiting block (406). The fixing plate (401) is connected to the rotating mechanism (3), and a long hole (404) is provided on the fixing plate (401). The sliding rod (405) is fixedly installed on the water-stopping plate (402) and passes through the long hole (404). The limiting block (406) is fixedly connected to the sliding rod (405). One end of the push rod (403) is connected to the side of the water-stopping plate (402), and the other end of the push rod (403) is connected to the inside of the tailstock body (1). The rotating mechanism (3) includes an operating block (301), a rotating screw (304), a nut (305), and a propulsion cylinder (307). The rotating screw (304) passes through the operating block (301) and its two protruding ends are connected to the nut (305). One end of the propulsion cylinder (307) is connected to the side of the rotating screw (304), and the other end of the propulsion cylinder (307) is fixedly connected to the fixing plate (401).

2. The shield tail sealing device in shield tunneling according to claim 1, characterized in that: It also includes bolts (408), and a connecting plate (407) is fixedly provided on the fixing plate (401). The connecting plate (407) is connected to the other end of the propulsion cylinder (307) by the bolts (408).

3. A shield tail sealing device for shield tunneling according to claim 2, characterized in that: The operating block (301) has a first groove (302) at both the upper and lower ends, and the rotating screw (304) is disposed through the first groove (302).

4. A shield tail sealing device for shield tunneling according to claim 3, characterized in that: The operating block (301) has a second groove (303) at both its left and right ends, and the rotating screw (304) is disposed through the second groove (303).

5. A shield tail sealing device for shield tunneling according to claim 4, characterized in that: A connecting rod (306) is fixedly provided at one end of the propulsion cylinder (307), and the connecting rod (306) is fixedly connected to the rotating screw (304).

6. A shield tail sealing device for shield tunneling according to claim 5, characterized in that: The shield tail body (1) is fixedly provided with a fixing plate (5), and the push rod (403) is movably fixed on the fixing plate (5).

7. A shield tail sealing device for shield tunneling according to claim 6, characterized in that: The fixing plate (5) is a telescopic plate.

8. A shield tail sealing device for shield tunneling according to claim 7, characterized in that: The fixing plate (401) has elongated holes (404) at both the upper and lower ends.

9. A shield tail sealing device for shield tunneling according to claim 8, characterized in that: The connecting rod (306) is welded to the rotating screw (304).

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