A multi-layer sealing device suitable for shield tunnel deep buried starting

Abstract

The utility model discloses a kind of portal multilayer sealing devices suitable for shield tunnel deep burying initial time, including portal steel ring, first layer annular sealing structure and second layer annular sealing structure, portal steel ring is installed at shield initial portal, first layer annular sealing structure and second layer annular sealing structure are spaced apartly installed in the inside of portal steel ring along the shaft of portal steel ring, first layer annular sealing structure includes first annular curtain rubber, air bag and multiple pressing plate, the outer periphery of first annular curtain rubber is fixed on portal steel ring, air bag is located on portal steel ring, and is located in the inside of first annular curtain rubber, each pressing plate is hinged on portal steel ring, and is tightly attached to the outside of first annular curtain rubber, and around the circumferential direction interval arrangement of portal steel ring, medium injection pipe is equipped on portal steel ring, medium injection pipe is connected with air bag. This portal multilayer sealing device can meet the sealing requirement and strong adaptability when shield tunnel deep burying initial time.

Description

Technical Field

[0001] This utility model relates to the field of shield tunneling technology, specifically to a multi-layer sealing device for tunnel portals during the deep-buried initial launch of a shield tunnel. Background Technology

[0002] In the construction of shield tunnels for urban rail transit, the launching operation is a critical link that determines construction safety and project quality. Under the condition of deep-buried launching (usually referring to launching shaft depth exceeding 30m), the water and soil pressure is significantly increased, and the reliability of the tunnel portal sealing device is directly related to construction safety. If the seal fails, it is very easy to cause risks such as groundwater leakage and surrounding soil loss. This may not only obstruct the launching of the shield machine, but also threaten the safety of surrounding buildings and structures and the normal operation of underground pipelines. Therefore, the development of a high-pressure tunnel portal sealing device suitable for deep-buried launching is of great engineering significance.

[0003] Currently, most shield tunnel portal sealing devices in China adopt the traditional structure of "pre-embedded steel ring in the launching shaft + single-layer seal," typically a single-layer rubber curtain seal. This type of device relies on the elasticity of the rubber material to fit against the shield shell during the shield machine's initial propulsion, thereby blocking the seepage channels between groundwater and soil. For example, a conventional rubber curtain seal uses a pre-embedded steel ring to fix the rubber curtain; as the shield machine advances, the rubber deforms under pressure, forming a preliminary seal. However, under launching conditions at a depth of 42m, the water and soil pressure is high, highlighting the limitations of the traditional single-layer seal structure. Its sealing performance is poor, easily deformed by water and soil pressure, and prone to leakage, failing to meet sealing requirements.

[0004] Chinese patent application number 202122233817.1 discloses a water-stopping sealing device for the tunnel entrance of a shield tunnel in water-rich soft soil strata. This device includes a tunnel entrance steel ring, an elastic grout-stopping plate, a flexible long-tail brush, and a rubber curtain plate. By connecting the elastic grout-stopping plate, the flexible long-tail brush, and the rubber curtain plate to the pre-embedded tunnel steel ring, a sealing water-stopping device can quickly block groundwater and ensure reinforcement quality even when not visible. Simultaneously, the use of multiple passive water-stopping sealing components ensures grouting effectiveness and isolates groundwater. In case of risks, various active water-stopping construction methods can be used to completely eliminate the risk of water inrush, ensuring construction quality and safety. However, this water-stopping sealing device for the tunnel entrance of a shield tunnel in water-rich soft soil strata has the following shortcomings: the elastic force of the elastic grout-stopping plate and the rubber curtain plate after deformation by the shield machine is fixed and cannot be adjusted according to depth, resulting in poor applicability. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a multi-layer sealing device for tunnel portals that can meet the sealing requirements of deep-buried shield tunnels at the start of launch and has strong adaptability.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A multi-layer sealing device for the portal of a shield tunnel during deep burial launch includes a portal steel ring, a first-layer annular sealing structure, and a second-layer annular sealing structure. The portal steel ring is installed at the shield launch portal. The first-layer annular sealing structure and the second-layer annular sealing structure are installed at intervals along the axis of the portal steel ring on its inner side. The first-layer annular sealing structure includes a first annular rubber curtain, an airbag, and multiple pressure plates. The outer periphery of the first annular rubber curtain is fixed to the portal steel ring. The airbag is located on the portal steel ring and on the side of the first annular rubber curtain facing the shield launch portal. Each pressure plate is hinged to the portal steel ring and is close to the side of the first annular rubber curtain facing away from the shield launch portal, and is arranged at intervals around the circumference of the portal steel ring. A medium injection pipe is provided on the portal steel ring, and the medium injection pipe is connected to the airbag for filling the airbag with a medium to inflate the airbag.

[0007] As a further improvement to the above technical solution: The outer periphery of the first annular rubber curtain is fixed to the portal steel ring by a plurality of first anchor bolts.

[0008] A connecting plate is hinged to the pressure plate, and the connecting plate is fixed to the portal steel ring by a corresponding first anchor bolt.

[0009] The outer periphery of the first annular rubber curtain is tightly attached to the end face of the tunnel portal steel ring away from the shield tunneling starting portal, and the connecting plate is pressed onto the outer periphery of the first annular rubber curtain.

[0010] A pad is provided between the connecting plate and the first annular rubber curtain.

[0011] The second layer annular sealing structure includes a second annular cord rubber and a mounting ring. The mounting ring is located inside the portal steel ring, and the outer periphery of the second annular cord rubber is fixed on the mounting ring.

[0012] The outer periphery of the second annular rubber cord is fixed to the mounting ring by the second anchor bolt.

[0013] The second annular rubber curtain is located in the middle of the portal steel ring.

[0014] The portal steel ring is equipped with a first grouting pipe and a second grouting pipe. The first grouting pipe is connected to the space between the first layer of annular sealing structure and the second layer of annular sealing structure, and the second grouting pipe is connected to the space between the second layer of annular sealing structure and the shield tunneling starting portal.

[0015] The portal steel ring is installed at the shield tunneling starting portal using a third anchor bolt.

[0016] Compared with the prior art, the advantages of this utility model are: The multi-layer sealing device for tunnel portals of this utility model is used as follows: Step 1, Shield machine preparation and initial sealing start: After the shield machine is assembled and debugged, the shield machine (its cutterhead) is pushed to the working face of the shield launching portal, and then the pushing is stopped. At this time, the first annular rubber curtain and the pressure plate flip inward under the squeezing action of the shield machine shell; a medium (such as water) is injected into the air bladder through the medium injection pipe, the air bladder expands and squeezes the first annular rubber curtain, so that the first annular rubber curtain tightly adheres to the shield machine shell, forming the first layer of seal; Step 2, formation of the second layer of seal: The shield machine continues to advance forward. During the advancement process, the shield machine shell gradually squeezes the second annular sealing structure, causing the second annular sealing structure to bend and deform inward and adhere to the shield machine shell, forming the second layer of seal; At this time, the first layer of seal and the second layer of seal work together to block the seepage channel between groundwater and soil. This multi-layer sealing device for tunnel portals during deep-buried tunneling starts has several advantages. First, the special first and second layer seals work together to meet the sealing requirements during deep-buried tunneling starts. Second, the pressure exerted by the first annular rubber curtain on the outer shell of the tunnel boring machine can be adjusted by the amount of medium injected into the airbag, thus adapting to the depth of the tunnel and making it highly versatile. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the multi-layer sealing device for the tunnel portal during the deep-buried launch of a shield tunnel, which is applicable to the present invention.

[0018] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0019] Figure 3 This is a side view of the multi-layer sealing device for the tunnel portal during the deep-buried launch of a shield tunnel, which is applicable to the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the first annular curtain rubber of the multi-layer sealing device for the tunnel portal during the deep-buried launch of a shield tunnel.

[0021] Figure 5 This is a schematic diagram of the structure of the second annular curtain rubber of the multi-layer sealing device for the tunnel portal during the deep-buried initial launch of a shield tunnel.

[0022] Figure 6 This is a schematic diagram of the pressure plate of the multi-layer sealing device for the tunnel portal during the deep-buried launch of a shield tunnel, which is applicable to the present invention.

[0023] Figure 7This is a diagram showing the usage status of the multi-layer sealing device for the tunnel portal during the deep-buried initial launch of a shield tunnel, which is applicable to the present invention.

[0024] Figure 8 yes Figure 7 A magnified structural diagram at point B in the middle.

[0025] The labels in the diagram represent: 1. Portal steel ring; 2. First layer annular sealing structure; 21. First annular rubber curtain; 22. Airbag; 23. Pressure plate; 231. Connecting plate; 24. First anchor bolt; 25. Liner plate; 3. Second layer annular sealing structure; 31. Second annular rubber curtain; 32. Mounting ring; 33. Second anchor bolt; 4. Shield tunneling starting portal; 5. Medium injection pipe; 6. First grouting pipe; 7. Second grouting pipe; 8. Third anchor bolt; 9. Shield machine; 91. Temporary support. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Figures 1 to 8This invention illustrates an embodiment of a multi-layer sealing device for the tunnel portal during deep-buried shield tunnel launch. This embodiment of the multi-layer sealing device for the tunnel portal during deep-buried shield tunnel launch includes a portal steel ring 1, a first-layer annular sealing structure 2, and a second-layer annular sealing structure 3. The portal steel ring 1 is installed at the shield launch portal 4. The first-layer annular sealing structure 2 and the second-layer annular sealing structure 3 are installed at intervals along the axis of the portal steel ring 1 on its inner side. The first-layer annular sealing structure 2 includes a first annular rubber curtain 21, an airbag 22, and... Multiple pressure plates 23 are fixed to the outer periphery of the first annular curtain rubber 21 on the tunnel portal steel ring 1. The airbag 22 is located on the tunnel portal steel ring 1 and on the side (inner side) of the first annular curtain rubber 21 facing the shield tunnel launch portal 4. Each pressure plate 23 is hinged to the tunnel portal steel ring 1 and is close to the side (outer side) of the first annular curtain rubber 21 facing away from the shield tunnel launch portal 4. They are arranged at intervals around the circumference of the tunnel portal steel ring 1. The tunnel portal steel ring 1 is provided with a medium injection pipe 5, which is connected to the airbag 22 and is used to fill the airbag 22 with medium to inflate the airbag 22.

[0031] like Figure 7 and Figure 8 As shown, the multi-layer sealing device for this tunnel entrance is used in the following way: Step 1: Preparation and Initial Sealing Start of Tunnel Boring Machine 9: After the Tunnel Boring Machine 9 is assembled and debugged, push the Tunnel Boring Machine 9 (its cutterhead) to the working face of the tunnel starting portal 4 and stop pushing. At this time, the first annular rubber curtain 21 and the pressure plate 23 flip inward under the squeezing action of the outer shell of the Tunnel Boring Machine 9; inject medium (such as water) into the airbag 22 through the medium injection pipe 5. The airbag 22 expands and squeezes the first annular rubber curtain 21, so that the first annular rubber curtain 21 tightly fits the outer shell of the Tunnel Boring Machine 9, forming the first layer of seal. Step 2, Formation of the second layer of seal: As the tunnel boring machine 9 continues to advance, during the advancement process, the outer shell of the tunnel boring machine 9 gradually squeezes the second layer of annular seal structure 3, causing the second layer of annular seal structure 3 to bend and deform inward and fit against the outer shell of the tunnel boring machine 9, forming the second layer of seal; at this time, the first layer of seal and the second layer of seal work together to block the seepage channel between groundwater and soil.

[0032] Step 3: Final seal formation: After the tail of the tunnel boring machine 9 has completely passed the portal sealing position, mortar or grease is injected through the first grouting pipe 6 and the second grouting pipe 7 to form the final seal.

[0033] This multi-layer sealing device for tunnel portals during deep-buried tunneling starts has the following advantages: Firstly, the special first and second layers of sealing work together to meet the sealing requirements during deep-buried tunneling starts. Secondly, the pressure exerted by the first annular rubber curtain 21 on the outer shell of the tunnel boring machine 9 can be adjusted by the amount of medium injected into the airbag 22, thus adapting to the depth of the tunnel and making it highly versatile.

[0034] Furthermore, in this embodiment, as Figure 2 As shown, the outer periphery of the first annular rubber curtain 21 is fixed to the portal steel ring 1 by a plurality of first anchor bolts 24. Preferably, the first anchor bolts 24 are arranged at intervals around the circumference of the portal steel ring 1. Of course, in other embodiments, the outer periphery of the first annular rubber curtain 21 can also be fixed to the portal steel ring 1 by other fixing methods (such as clamping or bonding).

[0035] Furthermore, in this embodiment, as Figure 2 and Figure 6 As shown, a connecting plate 231 is hinged to the pressure plate 23, and the connecting plate 231 is fixed to the portal steel ring 1 by the corresponding first anchor bolt 24. The pressure plate 23 flips inward and supports the outside of the first annular curtain rubber 21, increasing the compressive strength of the first annular curtain rubber 21, thereby improving the sealing effect.

[0036] Furthermore, such as Figure 1 and Figure 2 As shown, in this embodiment, the outer periphery of the first annular rubber curtain 21 is tightly attached to the end face of the portal steel ring 1 facing away from the shield tunneling starting portal 4, and the connecting plate 231 is pressed onto the outer periphery of the first annular rubber curtain 21. Preferably, a padding plate 25 is provided between the connecting plate 231 and the first annular rubber curtain 21.

[0037] Furthermore, in this embodiment, the second annular sealing structure 3 includes a second annular rubber curtain 31 and a mounting ring 32. The mounting ring 32 is located inside the portal steel ring 1, and the outer periphery of the second annular rubber curtain 31 is fixed to the mounting ring 32. During the forward advancement of the tunnel boring machine 9, the second annular rubber curtain 31 is gradually squeezed, causing it to bend and deform inward and conform to the outer shell of the tunnel boring machine 9, forming a second seal.

[0038] Furthermore, in this embodiment, the outer periphery of the second annular rubber cord 31 is fixed to the mounting ring 32 by the second anchor bolts 33. Preferably, there are multiple second anchor bolts 33, arranged at intervals around the circumference of the portal steel ring 1. More preferably, the second annular rubber cord 31 is located at the center of the portal steel ring 1.

[0039] Furthermore, in this embodiment, the portal steel ring 1 is equipped with a first grouting pipe 6 and a second grouting pipe 7. The first grouting pipe 6 connects to the space between the first annular sealing structure 2 and the second annular sealing structure 3, and the second grouting pipe 7 connects to the space between the second annular sealing structure 3 and the shield launching portal 4. After the tunnel boring machine 9 continues to advance until the tail of the shield has completely passed through the multi-layer sealing device of the portal, grease or mortar is injected into the gaps between the portal steel ring 1 and the tunnel segments and the shield launching portal 4 through the first grouting pipe 6 and the second grouting pipe 7; after the gaps are filled, a final seal is formed, ensuring that there is no risk of leakage during subsequent construction.

[0040] Furthermore, in this embodiment, the portal steel ring 1 is installed at the shield tunneling starting portal 4 using the third anchor bolt 8. During the installation of the portal steel ring 1, it can be supported inside the portal steel ring 1 by a temporary bracket 91, such as... Figure 1 and Figure 3 As shown, the interior of the portal steel ring 1 is supported by a temporary bracket 91. The temporary bracket 91 is removed after the portal steel ring 1 is installed.

[0041] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the present invention, or modify it into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A multi-layer sealing device for the portal of a shield tunnel during deep-buried launching, comprising a portal steel ring (1), a first-layer annular sealing structure (2), and a second-layer annular sealing structure (3), wherein the portal steel ring (1) is installed at the shield launching portal (4), and the first-layer annular sealing structure (2) and the second-layer annular sealing structure (3) are installed at intervals along the axis of the portal steel ring (1) on the inner side of the portal steel ring (1), characterized in that: The first layer of annular sealing structure (2) includes a first annular cord rubber (21), an airbag (22) and multiple pressure plates (23). The outer periphery of the first annular cord rubber (21) is fixed on the portal steel ring (1). The airbag (22) is located on the portal steel ring (1) and on the side of the first annular cord rubber (21) facing the shield tunneling starting portal (4). Each pressure plate (23) is hinged on the portal steel ring (1) and close to the side of the first annular cord rubber (21) facing away from the shield tunneling starting portal (4), and is arranged at intervals around the portal steel ring (1). The portal steel ring (1) is provided with a medium injection pipe (5). The medium injection pipe (5) is connected to the airbag (22) and is used to fill the airbag (22) with medium to make the airbag (22) expand.

2. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching as described in claim 1, characterized in that: The outer periphery of the first annular rubber curtain (21) is fixed to the portal steel ring (1) by a plurality of first anchor bolts (24).

3. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching as described in claim 2, characterized in that: A connecting plate (231) is hinged to the pressure plate (23), and the connecting plate (231) is fixed to the portal steel ring (1) by the corresponding first anchor bolt (24).

4. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching as described in claim 3, characterized in that: The outer periphery of the first annular rubber curtain (21) is tightly attached to the end face of the tunnel portal steel ring (1) away from the shield tunnel starting portal (4), and the connecting plate (231) is pressed on the outer periphery of the first annular rubber curtain (21).

5. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching as described in claim 4, characterized in that: A pad (25) is provided between the connecting plate (231) and the first annular fabric rubber (21).

6. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching as described in claim 1, characterized in that: The second layer annular sealing structure (3) includes a second annular cord rubber (31) and an mounting ring (32). The mounting ring (32) is located on the inner side of the portal steel ring (1), and the outer periphery of the second annular cord rubber (31) is fixed on the mounting ring (32).

7. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching as described in claim 6, characterized in that: The outer periphery of the second annular fabric rubber (31) is fixed to the mounting ring (32) by the second anchor bolt (33).

8. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching as described in claim 6, characterized in that: The second annular rubber curtain (31) is located in the middle of the portal steel ring (1).

9. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching according to any one of claims 1 to 8, characterized in that: The portal steel ring (1) is provided with a first grouting pipe (6) and a second grouting pipe (7). The first grouting pipe (6) is connected to the space between the first layer annular sealing structure (2) and the second layer annular sealing structure (3). The second grouting pipe (7) is connected to the space between the second layer annular sealing structure (3) and the shield tunneling starting portal (4).

10. The multi-layer sealing device for tunnel portals during deep-buried tunnel launching according to any one of claims 1 to 8, characterized in that: The portal steel ring (1) is installed at the shield tunneling starting portal (4) by the third anchor bolt (8).

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