Anti-seepage structure of shield receiving portal and construction method

Abstract

The application relates to the technical field of shield construction, and discloses a seepage-proof structure of a shield receiving tunnel portal and a construction method, which comprises a tunnel wall, the inner wall of the tunnel wall is fixedly connected with a closing sleeve, the outer wall of one side of the closing sleeve is slidably connected with an insertion sleeve, one end of the insertion sleeve is fixedly connected with a sealing head, the outer wall of the sealing head is slidably connected with the inner wall of the closing sleeve, the outer wall of the sealing head is fixedly connected with a sealing film, one side of the sealing film is fixedly connected with a connecting terminal, the rear side of the insertion sleeve is fixedly connected with a rear cover, and the inner wall of the rear cover is provided with a fixing assembly. The closing sleeve is fixed in the inner wall of the tunnel wall, the insertion sleeve drives the sealing head and the sealing film to be inserted into the closing sleeve, the connecting terminal is matched with the positioning block and the spring one to realize the unfolding of the sealing film, the connecting terminal is driven to slide into the closing sleeve through the synchronous assembly to form a sealing layer, the double sealing can intercept underground water and external precipitation, water seepage and leakage of the tunnel portal are avoided, and the safety of the staff in the receiving area is ensured.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine (TBM) construction technology, specifically to the seepage prevention structure and construction method of the TBM receiving tunnel portal. Background Technology

[0002] The shield tunnel receiving portal is a crucial connecting structure in shield tunnel construction, where the tunnel boring machine (TBM) excavates from the ground to the receiving shaft or reserved entrance. Serving as the passageway for the TBM to enter and exit the tunnel, it connects to the underground excavation strata on one side and the receiving area structures on the other, acting as a vital boundary between the tunnel and the external space. During TBM receiving construction and subsequent operation, the receiving portal is susceptible to leakage and water infiltration from pore water, groundwater, or external precipitation. This can lead to water accumulation in the receiving area, affecting construction progress, and potentially causing ground subsidence, damage to the tunnel wall structure, and in severe cases, even threatening the safety of construction personnel. Therefore, the TBM receiving portal must be equipped with a reliable anti-seepage structure to block water infiltration paths and ensure construction and operational safety.

[0003] In existing technologies, the seepage prevention of shield tunnel receiving portals mostly relies on a single sealing layer formed by the fixed laying of flexible waterproof materials or the curing of grout. This not only results in insufficient sealing reliability and poor fit with the tunnel wall and connecting structures, making it prone to gaps and unable to form multiple layers of protection, but also leads to easy failure. Some movable components lack a reset design, causing the sealing effect to decrease when reused. Furthermore, the reusability of the installation is poor, the positioning accuracy of the fixed waterproof structure is low, it is easily damaged by the shield machine's blades, and it cannot be disassembled and reused, resulting in material waste and increased costs. At the same time, the construction and structural linkage is insufficient, the sealing components are scattered without a synchronous driving mechanism, and the installation and docking are separate and independent operations without systematic assistance, resulting in low efficiency and easy to create seepage hazards due to docking deviations. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a seepage-proof structure and construction method for the tunnel entrance of a shield receiving tunnel, thus solving the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: The seepage prevention structure of the tunnel receiving portal includes a tunnel wall, a closed sleeve fixedly connected to the inner wall of the tunnel wall, an insertion sleeve slidably connected to one side of the outer wall of the closed sleeve, a sealing head fixedly connected to one end of the insertion sleeve, and the outer wall of the sealing head slidably connected to the inner wall of the closed sleeve. A sealing membrane is fixedly connected to the outer wall of the sealing head, and a connecting terminal is fixedly connected to one side of the sealing membrane. The outer walls of the sealing head and the sealing membrane are slidably connected to the inner wall of the closed sleeve. A guide block two is provided on the inner wall of the closed sleeve. A drive seat is slidably connected to the outer wall of the guide block two. A positioning block is slidably connected to the inner wall of the drive seat. A spring one is fixedly connected to the outer wall of the positioning block. The other end of the spring one is fixedly connected to the inner wall of the drive seat. The outer wall of the connecting terminal is slidably connected to the inner wall of the positioning block. The outer wall of the connecting terminal is slidably connected to the inner wall of the closed sleeve. A synchronization component is provided inside the closed sleeve. A rear cover is fixedly connected to the rear side of the insertion sleeve. A fixing component is provided on the inner wall of the rear cover.

[0006] Preferably, the synchronization component includes a first inclined plate, the lower surface of which is slidably connected to the inner wall of the closed sleeve, an inclined surface is provided on one side of the first inclined plate, and a second inclined plate is slidably connected to the outer wall of the first inclined plate.

[0007] Preferably, both ends of the inclined plate two are provided with inclined surfaces, and the outer wall of the inclined plate two is slidably connected to the inclined plate three, and the outer walls of the inclined plate two and the inclined plate three are slidably connected to the inner wall of the fixed plate two.

[0008] Preferably, a spring is fixedly connected to one side of the outer wall of the inclined plate two, and the top end of the spring is fixedly connected to the lower surface of the fixed plate two on the other side. A spring is fixedly connected to one side of the outer wall of the inclined plate three, and the end of the spring is fixedly connected to the outer wall of the fixed plate two on the other side.

[0009] Preferably, one end of the inclined plate three is fixedly connected to a driving block, the outer wall of the driving block is slidably connected to the outer wall of the connecting terminal, and the outer wall of the driving block is slidably connected to the inner wall of the closed sleeve.

[0010] Preferably, the fixing component includes a guide block, the outer wall of which is slidably connected to the inner wall of the rear cover, a fixed ring is fixedly connected to the outer wall of the guide block, a connecting sleeve is fixedly connected to the outer wall of the fixed ring, and the lower surface of the guide block is fixedly connected to the upper surface of the connecting sleeve.

[0011] Preferably, an electric push rod is fixedly connected to the middle of the fixed ring, and a moving ring is fixedly connected to the output end of the electric push rod. The outer wall of the moving ring is slidably connected to the inner wall of the connecting sleeve.

[0012] Preferably, a linkage rod is fixedly connected to the outer wall of the moving ring, an adjusting rod is rotatably connected to the outer wall of the linkage rod, and the outer wall of the adjusting rod is rotatably connected to the inner wall of the connecting sleeve.

[0013] Preferably, a fixing plate is rotatably connected to the outer wall of the adjusting rod, a limiting plate is rotatably connected to the middle of the fixing plate, the outer wall of the limiting plate is fixedly connected to the inner wall of the connecting sleeve, and an installation block is fixedly connected to the bottom end of the fixing plate.

[0014] A construction method for the seepage prevention structure of the shield tunnel receiving portal, the method comprising the following steps: S1. First, spray a layer of cement mortar around the inner wall of the tunnel opening in the direction of shield receiving, then put in the closing sleeve and wait for it to solidify. S2. After the closed sleeve and cement mortar have solidified, the insert sleeve is lifted by a crane and a hoist, aligned with the opening, and then fixed by the fixing structure inside the back cover after the connection is completed. S3. When fixing, the fixing component is used to fix it in advance. Then, when the moving ring of the fixing component moves, it synchronously drives the rear cover to push forward and push out the sealing head and sealing membrane into the inside of the closed sleeve. First, the insertion sleeve and the sealing head combine with the closed sleeve to achieve the first sealing and waterproofing. When the sealing head enters the inside of the closed sleeve, it moves to both sides through the positioning block under the insertion of the sealing head, and then it is used for the second sealing.

[0015] This invention provides a seepage-proof structure and construction method for the tunnel portal of a shield tunnel. It has the following beneficial effects: 1. This invention fixes the closed sleeve to the inner wall of the tunnel, and with the help of the insertion sleeve, drives the sealing head and sealing membrane to be inserted into the closed sleeve. The sealing membrane is unfolded by the cooperation of the connecting terminal, the positioning block and the spring. Then, the connecting terminal is driven to slide into the closed sleeve through the synchronous component to form a sealing layer. This achieves the effect of double sealing to intercept groundwater and external precipitation, prevent water seepage and leakage at the tunnel entrance, and ensure the safety of the staff in the receiving area.

[0016] 2. This invention uses a drive seat to drive inclined plates one, two, and three in a coordinated manner. With the elastic reset action of springs two and three, the drive block moves forward, causing the connecting terminal to slide precisely into the inner wall of the closed sleeve. This achieves the effect of strengthening the fit between the sealing film and the closed sleeve, filling gaps, and further eliminating the risk of water leakage.

[0017] 3. This invention uses an electric push rod to drive the moving ring, linkage rod, and adjusting rod in a coordinated manner, with the limiting plate for positioning, to make the mounting block fit and position with the closing sleeve. Combined with the auxiliary support and jacking of the push rod matrix on the rear side of the fixed ring, it achieves the effects of accurate installation positioning, improved sealing, and rapid installation and disassembly deployment. Attached Figure Description

[0018] Figure 1 This is a perspective view of the seepage-proof structure of the present invention; Figure 2 This is a partial schematic diagram of the closed sleeve of the seepage-proof structure of the present invention; Figure 3This is a schematic diagram of the internal structure of the closed sleeve of the seepage-proof structure of the present invention; Figure 4 This is a partial schematic diagram of the inclined plate of the seepage-proof structure of the present invention; Figure 5 This is a partial schematic diagram of the rear cover of the anti-seepage structure of the present invention; Figure 6 This is a partial schematic diagram of the dynamic ring of the seepage-proof structure of the present invention; Figure 7 This is a partial schematic diagram of the adjusting rod of the seepage-proof structure of the present invention; Figure 8 This is a partial schematic diagram of the limiting plate of the seepage prevention structure of the present invention; Figure 9 This is a flowchart of the construction method of the present invention.

[0019] The components are as follows: 1. Rear cover; 2. Fixed ring; 3. Electric push rod; 4. Moving ring; 5. Connecting sleeve; 6. Guide block one; 7. Adjusting rod; 8. Limiting plate; 9. Mounting block; 10. Linkage rod; 11. Fixing plate one; 12. Closing sleeve; 13. Insertion sleeve; 14. Sealing head; 15. Sealing membrane; 16. Connecting terminal; 17. Positioning block; 18. Spring one; 19. Inclined plate one; 20. Inclined plate two; 21. Spring two; 22. Inclined plate three; 23. Fixing plate two; 24. Spring three; 25. Drive block; 26. Guide block two; 27. Drive seat; 28. Cavity wall. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please see the appendix Figure 1 - Appendix Figure 3 The present invention provides a seepage-proof structure for a shield tunnel receiving portal, including a tunnel wall 28. A closed sleeve 12 is fixedly connected to the inner wall of the tunnel wall 28. An insertion sleeve 13 is slidably connected to one side of the outer wall of the closed sleeve 12. A sealing head 14 is fixedly connected to one end of the insertion sleeve 13. The outer wall of the sealing head 14 is slidably connected to the inner wall of the closed sleeve 12. A sealing membrane 15 is fixedly connected to the outer wall of the sealing head 14. A connecting terminal 16 is fixedly connected to one side of the sealing membrane 15. The outer walls of the sealing head 14 and the sealing membrane 15 are slidably connected to the inner wall of the closing sleeve 12. A guide block 26 is provided on the inner wall of the closing sleeve 12. A drive seat 27 is slidably connected to the outer wall of the guide block 26. A positioning block 17 is slidably connected to the inner wall of the drive seat 27. A spring 18 is fixedly connected to the outer wall of the positioning block 17. The other end of the spring 18 is fixedly connected to the inner wall of the drive seat 27. The outer wall of the connecting terminal 16 is slidably connected to the inner wall of the positioning block 17. The outer wall of the connecting terminal 16 is slidably connected to the inner wall of the closing sleeve 12. A synchronization component is provided inside the closing sleeve 12. A rear cover 1 is fixedly connected to the rear side of the insertion sleeve 13. A fixing component is provided on the inner wall of the rear cover 1.

[0022] Specifically, first, the closing sleeve 12 is placed inside the tunnel wall 28. During use, the closing sleeve 12 can be installed using either spraying or bolt fixing. A waterproof tarpaulin can be installed around it by laying the tarpaulin inside the soil layer of the tunnel wall 28. After the closing sleeve 12 is installed, the back cover 1 and the insertion sleeve 13 are lifted by a crane for installation. After alignment, the fixing components are first connected to the inner side of the closing sleeve 12 for pre-positioning. Then, when the moving ring moves again, it lifts the closing sleeve 12 to complete the fixing. Subsequently, the insertion sleeve 13 moves... The sealing head 14 is inserted into the closed sleeve 12. During use, as the sealing head 14 moves forward, the sealing membranes 15 on both sides first enter. When the sealing head 14 extends further, the front end separates from the connecting terminal 16, causing the sealing membranes 15 to separate to both sides. Subsequently, the connecting terminal 16 slides into the groove of the positioning block 17. When the square segment of the sealing head 14 enters the closed sleeve 12, the front end causes the positioning block 17 to compress the spring 18 to both sides. When the spring 18 reaches its bottom, it causes the drive seat 27 to move backward. At the same time, the rear side... The synchronous component drives the connecting terminal 16 to slide into the interior of the closing sleeve 12, ultimately completing the seal. This further prevents water from entering the receiving hole during use and ensures the safety of personnel in the receiving hole direction. During use, this structure can completely seal both sides, thus preventing groundwater from gushing out before the tunnel boring machine arrives at the receiving area. Secondly, after the tunnel boring machine arrives at the receiving hole, the subsequent sealing prevents external water from entering the channel. Furthermore, compared to the conventional method of simply laying waterproof cloth or waterproof skin, the internal closing sleeve 12 can be removed and reused synchronously. Waterproof cloth or waterproof skin is fixed to one side around the hole, which cannot provide waterproofing when encountering flooding or heavy rain. Moreover, after the tunnel boring machine arrives, it cannot be disassembled, which may lead to damage from the tunnel boring machine's blades. This structure can be disassembled by first loosening the fixing component, then using a crane to move the outer rear cover 1 away, and finally removing the internal closing sleeve 12. This not only allows for quick installation during use but also has the effect of repeated use.

[0023] Please see the appendix Figure 3 - Appendix Figure 4The synchronization component includes a first inclined plate 19, the lower surface of which is slidably connected to the inner wall of the closed sleeve 12. One side of the first inclined plate 19 has an inclined surface, and the outer wall of the first inclined plate 19 is slidably connected to a second inclined plate 20. Both ends of the second inclined plate 20 have inclined surfaces, and the outer wall of the second inclined plate 20 is slidably connected to a third inclined plate 22. The outer walls of both the second and third inclined plates 20 are slidably connected to the inner wall of a second fixed plate 23. One side of the outer wall of the second inclined plate 20 is fixedly connected to a second spring 21, and the top end of the second spring 21 on the other side is fixedly connected to the lower surface of the second fixed plate 23. One side of the outer wall of the third inclined plate 22 is fixedly connected to a third spring 24, and the end of the third spring 24 on the other side is fixedly connected to the outer wall of the second fixed plate 23. One end of the inclined plate 22 is fixedly connected to a driving block 25. The outer wall of the driving block 25 is slidably connected to the outer wall of the connecting terminal 16, and the outer wall of the driving block 25 is slidably connected to the inner wall of the closing sleeve 12.

[0024] Specifically, when the insertion sleeve 13 drives the sealing head 14 forward, it squeezes the sealing membrane 15 to both sides, thus achieving a sealing effect during use. Simultaneously, when the connecting terminal 16 separates to both sides, it is limited by the positioning block 17. When the sealing head 14 continues to advance, it pushes the drive seat 27 to move backward under the limitation of the guide block 26. During use, the drive seat 27 drives the inclined plate 19 to move. When the inclined surface of the inclined plate 19 is in contact with the inclined surface of the inclined plate 20, the inclined surfaces on both sides work together to compress the spring 21 of the inclined plate 20, thereby driving the inclined plate during use. As the inclined plate 22 moves forward, it compresses the spring 24, which in turn drives the drive block 25 forward. At this time, the positioning block 17 and the connecting terminal 16 are in contact, and the drive block 25 drives the connecting terminal 16 to slide into the inner wall of the closing sleeve 12, thereby forming a sealing layer. During use, the sealing membrane 15 can be made of flexible material, such as the rubber commonly used in sealing rings. Rubber is elastic, which avoids affecting the sliding of the sealing membrane 15 into the inner wall of the closing sleeve 12. At the same time, when the insertion sleeve 13 is fully inserted, the sealing membrane 15 can further achieve a sealing effect, avoiding the problem of water leakage from gaps.

[0025] Please see the appendix Figure 5 - Appendix Figure 8The fixing assembly includes a guide block 6, the outer wall of which is slidably connected to the inner wall of the rear cover 1. A fixed ring 2 is fixedly connected to the outer wall of the guide block 6, and a connecting sleeve 5 is fixedly connected to the outer wall of the fixed ring 2. The lower surface of the guide block 6 is fixedly connected to the upper surface of the connecting sleeve 5. An electric push rod 3 is fixedly connected to the middle of the fixed ring 2, and a moving ring 4 is fixedly connected to the output end of the electric push rod 3. The outer wall of the moving ring 4 is slidably connected to the inner wall of the connecting sleeve 5. A linkage rod 10 is fixedly connected to the outer wall of the moving ring 4, and an adjusting rod 7 is rotatably connected to the outer wall of the linkage rod 10. The outer wall of the adjusting rod 7 is rotatably connected to the inner wall of the connecting sleeve 5. A fixing plate 11 is rotatably connected to the outer wall of the adjusting rod 7, and a limit plate 8 is rotatably connected to the middle of the fixing plate 11. The outer wall of the limit plate 8 is fixedly connected to the inner wall of the connecting sleeve 5, and a mounting block 9 is fixedly connected to the bottom end of the fixing plate 11.

[0026] Specifically, the rear cover 1 is lifted by a crane, and then the rear cover 1 drives the insertion sleeve 13 to engage with the closing sleeve 12. During use, the electric push rod 3 drives the moving ring 4 forward, which in turn drives the rear cover 1 forward. When the electric push rod 3 is activated, it drives the moving ring 4 to move the rear cover 1 forward. As the moving ring 4 moves forward, it drives the linkage rod 10 to rotate the adjusting rod 7 under the limit of the connecting sleeve 5. During use, the adjusting rod 7 drives the fixing plate 11 and the mounting block 9 to engage with the closing sleeve 12. During use, the limiting plate 8 limits the fixing plate 11. When not installed, in order to achieve positioning, the adjusting rod 7 and the fixing plate 11 first drive the mounting block 9 to engage with the closing sleeve 12, thus completing the first positioning. Then, the fixed ring 2 completes the second positioning. During use, the fixed ring 2... A push rod matrix is ​​set on the rear side along the cross direction of the fixed ring 2. During use, electric push rods, hydraulic push rods, and pneumatic push rods can be selected according to the actual application scenario. Through the push rod matrix on the rear side, the fixed ring 2 is pushed forward first. At this time, the mounting block 9 will be released. Then, the electric push rod 3 is activated again to drive the moving ring 4 forward. During use, the push rod matrix can provide support for the fixed ring 2, thereby assisting the electric push rod 3 in pushing the moving ring 4. At the same time, after the front mounting block 9 is fixed, the push rod matrix can also drive the rear cover 1 forward to continue pushing. Thus, during use, not only can the sealing be improved, but the installation effect can also be more precise. During use, the mounting block 9 not only has a positioning function, but also an installation function. The rear cover 1 can be disassembled and installed by controlling the electric push rod 3. During use, the deployment, installation, and disassembly effects can be achieved more quickly.

[0027] Example 2: Please refer to Figure 9A construction method for the seepage prevention structure of the shield tunnel receiving portal, the method comprising the following steps: S1. First, spray a layer of cement mortar around the inner wall of the tunnel opening in the direction of shield receiving, then put in the closing sleeve 12 and wait for it to solidify. S2. After the closed sleeve 12 and the cement mortar have solidified, the insertion sleeve 13 is lifted by a crane and a hoist, aligned with the opening, and then fixed by the fixing structure inside the back cover 1 after the connection is completed. S3. During fixing, the fixing component is used to fix the device in advance. Then, when the moving ring 4 of the fixing component moves, it synchronously drives the rear cover 1 to push forward the sealing head 14 and the sealing membrane 15 to insert into the inside of the closing sleeve 12. First, the insertion sleeve 13 and the sealing head 14 are combined with the closing sleeve 12 to achieve the first sealing and waterproofing. After the sealing head 14 enters the inside of the closing sleeve 12, it moves to both sides through the positioning block 17 under the insertion of the sealing head 14, and then it is used for the second sealing.

[0028] Specifically, S1, the first step is to spray the cement mortar around the inside of the hole, and then insert the closing sleeve 12. The mortar serves two purposes: first, to aid adhesion, and second, to help seal both sides of the closing sleeve 12 to prevent water seepage. During use, an additional barrier layer can be deployed on the back of the closing sleeve 12 and installed with bolts for easy installation and disassembly later. S2. Using a crane or other auxiliary lifting tools, lift the rear cover 1. Then, insert one side of the fixing component into the opening. The rear cover 1 then drives the insertion sleeve 13 and sealing head 14 to connect with the closing sleeve 12. At this time, by activating the electric push rod 3, the moving ring 4 slides under the limit of the connecting sleeve 5. During the movement of the moving ring 4, the linkage rod 10 is driven, which in turn drives the adjusting rod 7 to rotate under the limit of the connecting sleeve 5. In use, the adjusting rod 7 controls the fixing plate 11 to drive the mounting block 9 and the inner side of the closing sleeve 12 to fit together under the limit of the limiting plate 8. At this time, the fixed ring 2 then... The push rod matrix set on the side applies force to the fixed ring 2. When the fixed ring 2 is pushed, the electric push rod 3 is released. At the same time, when the electric push rod 3 is moving, the push rod matrix on the back side of the fixed ring 2 assists in pulling the back cover 1 forward. In the process of use, when the mounting block 9 and the inner wall support of the closing sleeve 12 are combined, it plays the first auxiliary positioning role. Then, through the push rod matrix, it plays the role of assisting in controlling the forward movement of the back cover 1. In the process of use, it can control the combination of the back cover 1 and the closing sleeve 12. When both sides are sealed, it completes the effect of intercepting and preventing seepage of internal groundwater and external precipitation. S3. When the rear cover 1 moves the insertion sleeve 13 and the sealing head 14 forward, the sealing head 14 drives the sealing membrane 15 and the connecting terminal 16 to be inserted into the closed sleeve 12. During use, when the front end of the sealing head 14 reaches one side of the positioning block 17, the front end of the connecting terminal 16 separates from the sealing head 14. In order to make it easier to use, two magnets can be set on the adjacent side of the two sets of connecting terminals 16. During use, the two can close when they are pulled out. During use, when the connecting terminal 16 slides into the interior of the positioning block 17, the positioning block 17 separates from the sealing head 14 along the slope positioning block 17 when the sealing head 14 extends into the head end. At this time, the positioning block 17 compresses the spring 18, and the positioning block 17 drives the connecting terminal 16 to unfold to both sides during use. During the unfolding process, the sealing head 14 synchronously drives the drive seat 27 to move backward under the limit of the guide block 26. At this time, the drive seat 27 drives the inclined plate 19 and the inclined plate 20 to compress the spring 21, that is, the inclined plate 20 rises and pushes the inclined plate 3 22 and the spring 3 24. Then, during use, the spring 3 24 allows the drive block 25 to protrude under the limit of the fixed plate 23. Then, during use, when the connecting terminal 16 slides into the inside of the closed sleeve 12, the sealing membrane 15 completes the sealing to prevent water seepage and leakage. Then, during use, when the sealing head 14 is inserted into the inside of the closed sleeve 12, the first-level seal is completed. When the sealing head 14 is fully inserted, the second-level seal is completed through the cooperation of the closed sleeve 12 and the sealing membrane 15, which further avoids the effect of water leakage due to groundwater seepage during long-term use.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A seepage-proof structure for a shield tunnel receiving portal, including a tunnel wall (28), characterized in that: The inner wall of the cavity wall (28) is fixedly connected to a closed sleeve (12), and an insertion sleeve (13) is slidably connected to one side of the outer wall of the closed sleeve (12). A sealing head (14) is fixedly connected to one end of the insertion sleeve (13), and the outer wall of the sealing head (14) is slidably connected to the inner wall of the closed sleeve (12). A sealing membrane (15) is fixedly connected to the outer wall of the sealing head (14). A connecting terminal (16) is fixedly connected to one side of the sealing membrane (15). The outer walls of the sealing head (14) and the sealing membrane (15) are slidably connected to the inner wall of the closing sleeve (12). A guide block two (26) is provided on the inner wall of the closing sleeve (12). A drive seat (27) is slidably connected to the outer wall of the guide block two (26). A positioning block (17) is slidably connected to the inner wall of the drive seat (27). (17) has a spring (18) fixedly connected to its outer wall. The other end of the spring (18) is fixedly connected to the inner wall of the drive seat (27). The outer wall of the connecting terminal (16) is slidably connected to the inner wall of the positioning block (17). The outer wall of the connecting terminal (16) is slidably connected to the inner wall of the closing sleeve (12). The closing sleeve (12) is provided with a synchronization component. The rear side of the insertion sleeve (13) is fixedly connected to a rear cover (1). The inner wall of the rear cover (1) is provided with a fixing component.

2. The seepage-proof structure of the shield receiving tunnel portal according to claim 1, characterized in that: The synchronization component includes a first inclined plate (19), the lower surface of which is slidably connected to the inner wall of the closed sleeve (12), an inclined surface is provided on one side of the first inclined plate (19), and a second inclined plate (20) is slidably connected to the outer wall of the first inclined plate (19).

3. The seepage-proof structure of the shield receiving tunnel portal according to claim 2, characterized in that: Both ends of the inclined plate two (20) are provided with inclined surfaces. The outer wall of the inclined plate two (20) is slidably connected to the inclined plate three (22). The outer walls of the inclined plate two (20) and the inclined plate three (22) are slidably connected to the inner wall of the fixed plate two (23).

4. The seepage-proof structure of the shield receiving tunnel portal according to claim 3, characterized in that: One side of the inclined plate 2 (20) is fixedly connected to a spring 2 (21), and the top of the spring 2 (21) on the other side is fixedly connected to the lower surface of the fixed plate 2 (23). One side of the inclined plate 3 (22) is fixedly connected to a spring 3 (24), and the end of the spring 3 (24) on the other side is fixedly connected to the outer wall of the fixed plate 2 (23).

5. The seepage-proof structure of the shield receiving tunnel portal according to claim 4, characterized in that: One end of the inclined plate three (22) is fixedly connected to a driving block (25), the outer wall of the driving block (25) is slidably connected to the outer wall of the connecting terminal (16), and the outer wall of the driving block (25) is slidably connected to the inner wall of the closing sleeve (12).

6. The seepage-proof structure of the shield receiving tunnel portal according to claim 1, characterized in that: The fixing component includes a guide block (6), the outer wall of which is slidably connected to the inner wall of the rear cover (1), a fixed ring (2) is fixedly connected to the outer wall of the guide block (6), a connecting sleeve (5) is fixedly connected to the outer wall of the fixed ring (2), and the lower surface of the guide block (6) is fixedly connected to the upper surface of the connecting sleeve (5).

7. The seepage-proof structure of the shield receiving tunnel portal according to claim 6, characterized in that: An electric push rod (3) is fixedly connected to the middle of the fixed ring (2), and a moving ring (4) is fixedly connected to the output end of the electric push rod (3). The outer wall of the moving ring (4) is slidably connected to the inner wall of the connecting sleeve (5).

8. The seepage-proof structure of the shield receiving tunnel portal according to claim 7, characterized in that: The outer wall of the moving ring (4) is fixedly connected to a linkage rod (10), and the outer wall of the linkage rod (10) is rotatably connected to an adjusting rod (7). The outer wall of the adjusting rod (7) is rotatably connected to the inner wall of the connecting sleeve (5).

9. The seepage-proof structure of the shield receiving tunnel portal according to claim 8, characterized in that: The outer wall of the adjusting rod (7) is rotatably connected to a fixing plate (11), and the middle part of the fixing plate (11) is rotatably connected to a limiting plate (8). The outer wall of the limiting plate (8) is fixedly connected to the inner wall of the connecting sleeve (5), and the bottom end of the fixing plate (11) is fixedly connected to an installation block (9).

10. A construction method for the seepage prevention structure of a shield tunnel receiving portal, applicable to the seepage prevention structure of the shield tunnel receiving portal as described in any one of claims 1-9, characterized in that, The method includes the following steps: S1. First, spray a layer of cement mortar around the inner wall of the tunnel opening in the direction of shield receiving, and then put in the closing sleeve (12) and wait for it to solidify. S2. After the closed sleeve (12) and cement mortar have solidified, the insertion sleeve (13) is lifted by a crane and a hoist and aligned with the opening. After the connection is completed, it is fixed by the fixing structure inside the back cover (1). S3. When fixing, the fixing component is used to fix it in advance. Then, when the moving ring (4) of the fixing component moves, it synchronously drives the back cover (1) to push the sealing head (14) and sealing film (15) forward and insert them into the inside of the closing sleeve (12). First, the insertion sleeve (13) and sealing head (14) are combined with the closing sleeve (12) to achieve the first sealing and waterproofing. When the sealing head (14) enters the inside of the closing sleeve (12), it moves to both sides through the positioning block (17) under the insertion of the sealing head (14) and then is used for the second sealing.

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