Sealing structure and method for floating tunnel pipe joint connector

Abstract

The invention provides a sealing structure of a floating tunnel pipe joint, which comprises a pipe joint I, a pipe joint II and a multi-layer sealing structure, the multi-layer sealing structure comprises a waterproof protection device fixedly connected with the pipe joint I and the pipe joint II and a multi-layer water stop structure arranged on the inner side of the waterproof protection device, and the multi-layer water stop structure is connected with the pipe joint I and the pipe joint II; the multi-layer water stop structure sequentially comprises a first water stop structure, a second water stop structure and a third water stop structure from outside to inside. And by arranging the waterproof protection device, the effectiveness and durability of the water stop structure are improved. And the rubber composite part is arranged at the end part of the metal water-stop belt, so that the reliability of connection between the first water-stop structure and the pipe joint is improved. The inflatable airbag is arranged in the center of the rubber body of the second water stop structure, so that the effectiveness of the sealing structure of the second water stop structure is improved. And a fixed press-fitting device is arranged in the third water stop structure, replacement is achieved by adjusting the tightness of a nut, and convenience and rapidness are achieved. The invention further provides a sealing method of the floating tunnel pipe joint connector.

Description

Technical Field

[0001] The invention relates to the technical field of suspended tunnel connection, and in particular to a suspended tunnel pipe joint sealing structure. Background Art

[0002] The underwater suspended tunnel, also known as the Archimedean bridge, is a new way to cross extreme waters by using the buoyancy of the tube to support the tunnel and traffic load. The underwater suspended tunnel is generally composed of a tubular structure suspended at a certain depth in the water to meet traffic function requirements, an underwater positioning system to prevent excessive displacement, pipe joints, and a revetment structure connected to both sides.

[0003] Pipe joints are an important part of the underwater floating tunnel structure system, but they are also the weak link of the underwater floating tunnel structure system. The floating tunnel is immersed in the deep sea all year round, and the sealing device of the pipe joints of the floating tunnel generally contains rubber materials, which will be eaten or damaged by fish or other organisms. At the same time, due to the presence of various pollution sources in the sea water, especially the presence of some oils, acids, alkalis, iodine and other substances, the rubber materials will be corroded to a certain extent, which will cause high-level harm over time; in addition, compared with land transportation facilities, the hydrostatic pressure and additional dynamic water pressure generated by the water body acting on the floating tunnel pipe section will also cause changes in the natural frequency and vibration mode of the structure and produce additional damping. Under the dual effects of long-term stress corrosion and seawater chemical corrosion, the key components of the pipe joints of the underwater floating tunnel are easily damaged, resulting in a decrease in the sealing performance of the pipe joints of the underwater floating tunnel, and in severe cases, even threatening the overall safety performance of the underwater floating tunnel.

[0004] Through searching, there are mainly 3 patents related to this patent: 1. The invention patent with the patent number "202311652172.2" and the patent name "Suspended Tunnel Pipe Joint Structure Adapting to Large Deformation" discloses an underwater suspended tunnel joint structure, including a first water-stopping structure, a second water-stopping structure, a first-layer deformation control structure, and a second-layer deformation control structure. The first water-stopping structure stretches or compresses with the deformation between the pipe segments, and the second water-stopping structure is fixed by a hoop and a first bolt that surround and press it on the pipe segment. The joint structure of this invention is made of flexible material as a whole, which can adapt to large deformations between pipe segments while ensuring the water-stopping and sealing effect.

[0005] 2. The invention patent with the patent number "202311649459.X" and the patent name "Suspended Tunnel Pipe Joint Structure" discloses a suspended tunnel joint structure, which includes a first water stop, a second water stop, a shear key and a prestressed steel bar. The first water stop is fixed at the connection between the first pipe section and the second pipe section by a hoop and a bolt. The prestressed steel bar passes through the first pipe section and the second pipe section respectively. A spring connecting the first pipe section and the second pipe section is also provided in the middle of the prestressed steel bar. The structure of the invention has good water tightness and deformation resistance, and can meet the vibration and deformation of the underwater suspended tunnel joint in a complex marine environment.

[0006] 3. The invention patent with the patent number of "202311649484.8" and the patent name of "Suspended Tunnel Joint Combined Structure", a suspended tunnel joint combined structure, including at least two linearly connected pipe segment modules; adjacent pipe segment modules are connected by rigid joints; each of the pipe segment modules includes a first pipe segment and a second pipe segment connected by a flexible joint. One end of the first pipe segment and the second pipe segment is provided with a tenon-shaped shear key, and the other end is provided with a mortise structure, and two "GINA" waterstops are also provided on both sides of the shear key. The flexible joint includes prestressed concrete and anchor seats and anchors that pass through adjacent pipe segments; the rigid joint includes anchoring steel bars and concrete arranged between adjacent pipe segment modules. The flexible joint is docked on land, and the rigid joint is docked underwater, which facilitates construction, ensures the sealing and water-stopping properties between the pipe segments, and can also resist the vibration and deformation caused by the suspended tunnel joints in complex marine environments.

[0007] The existing technical solutions basically adopt the sealing structure of the traditional immersed tube tunnel and adopt GINA-like waterstop and other methods for sealing. The rubber waterstop currently used does not have the repair function and will cause stress relaxation due to rubber aging and other conditions, affecting the sealing effect and even affecting the safe operation of the underwater suspended tunnel.

[0008] In summary, how to provide a floating tunnel pipe joint sealing structure that can improve the safety and durability of the sealing between the underwater floating tunnel pipe joints is a technical problem that needs to be solved urgently. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a sealing structure for a floating tunnel pipe segment joint in view of the defects existing in the prior art, which can improve the safety and durability of the sealing between the pipe segments of the underwater floating tunnel.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is: a sealing structure of a suspended tunnel pipe joint, including pipe joint one and pipe joint two, and also including a multi-layer sealing structure that flexibly connects pipe joint one and pipe joint two, the multi-layer sealing structure includes a waterproof protection device that fixes pipe joint one and pipe joint two, and a multi-layer water-stopping structure arranged on the inner side of the waterproof protection device, and the multi-layer water-stopping structure connects pipe joint one and pipe joint two; the multi-layer water-stopping structure includes a first water-stopping structure, a second water-stopping structure and a third water-stopping structure in sequence from the outside direction of the pipe joint (GW) to the inside direction of the pipe joint (GN).

[0011] Furthermore, the first waterstop structure includes a metal waterstop and a rubber composite part arranged at both ends of the metal waterstop, the rubber composite part is provided with threaded holes, and the first waterstop structure is fixedly connected between pipe section one and pipe section two through the threaded holes of the rubber composite part and bolts.

[0012] Furthermore, the pipe segment one has a first end portion axially facing the pipe segment two, and the end face of the pipe segment two has a groove corresponding to the first end portion of the pipe segment one, and the first ends are evenly spaced along the circumference of the pipe segment, and each pipe segment has a first end at one end and a groove at the other end.

[0013] Furthermore, the second water-stopping structure is arranged in the gap between the first end of the pipe segment 1 and the groove of the pipe segment 2.

[0014] Furthermore, the second water-stopping structure includes a rubber body and a fixing device, and the fixing device is provided with a connecting plate, a pad, a limit plate and a fixing bolt, and the fixing bolt fixes the two ends of the second water-stopping structure to the first end of pipe segment one and the bottom surface of the groove of pipe segment two through the limit plate, the pad and the connecting plate in sequence.

[0015] Furthermore, the second water-stopping structure also includes an airbag arranged in the center of the rubber body; the airbag is also provided with an air nozzle assembly, the air nozzle assembly penetrates the rubber body and connects the airbag with a high-pressure air pipe, and the high-pressure air pipe is connected to a pressure gauge and an inflation device for monitoring the air pressure of the airbag.

[0016] Furthermore, an airbag reinforcement curtain is provided on the inner wall of the airbag.

[0017] Furthermore, the first end portion is also provided with a first step and a second step, and a buffer device is provided on the first step and the second step to prevent the end face of the second pipe segment from colliding with the first pipe segment.

[0018] Furthermore, the third water-stop structure includes a rubber water-stop strip and a fixed pressure plate device, and the two fixed pressure plate devices respectively connect the two first ends of the rubber water-stop strip to the pipe segment one and the pipe segment two.

[0019] A sealing method for the joint of a floating tunnel segment. According to the bearing and deformation requirements of the floating tunnel segment joint sealing structure under extreme working conditions, a waterproof protection device is added outside the multi-layer water stop structure, so that the multi-layer water stop structure can maintain the sealing and water stop function under extreme working conditions; an airbag is arranged in the second water stop structure, and the height of the second water stop structure is adjusted by controlling the pressure in the airbag, so as to adjust the pre-compression amount and initial stiffness of the second water stop structure, so that the second water stop structure can maintain the sealing and water stop function under extreme working conditions.

[0020] Advantages of the present invention: (1) By setting a waterproof protection device between the first segment and the second segment, the multi-layer water stop structure inside is effectively isolated from seawater, thus avoiding fish or other foreign objects from gnawing or damaging the rubber material, and also avoiding the corrosion of the water stop structure of the rubber material by pollution sources in seawater, improving the effectiveness and durability of the sealing performance of the multi-layer water stop structure itself.

[0021] (2) Rubber composite parts are arranged at the two first ends of the metal water stop belt in the first water stop structure, changing the original rigid fixation of the bolt and the metal water stop belt to a flexible connection with certain elasticity; when the floating tunnel is fluctuating, the rubber composite part of the second water stop structure plays a buffering role, improving the reliability of the connection between the first water stop structure and the segment, and improving the sealing performance of the first water stop structure.

[0022] (3) By arranging an inflatable airbag at the center of the rubber main body of the second water stop structure, when the rubber main body shows stress relaxation after long-term use and the height H of the rubber main body is lower than the initial height H0 (i.e., H < H0), the height and strength of the rubber main body in the second water stop structure can be effectively compensated by inflating the airbag, thereby ensuring the effectiveness of the floating tunnel segment joint sealing structure.

[0023] (4) By arranging a third water stop structure in the innermost layer of the two segments, and ingeniously arranging a fixed pressing device in the third water stop structure by the lever principle, the rubber water stop belt is pressed between the first segment and the second segment through the limiting block, and the rubber water stop belt can be replaced or installed inside the floating tunnel by adjusting the tightness of the nut, which is fast and easy to operate. Description of the drawings

[0024] Figure 1 It is a schematic cross-sectional view of an embodiment of the present invention (GW: represents the outer direction of the segment; GN: represents the inner direction of the segment); Figure 2 is Figure 1 the partial enlarged view of A in Figure 3 It is a schematic structural view of the second layer of water stop structure in an embodiment of the present invention; Figure 4 It is a schematic structural diagram of the second layer of water-stopping structure after inflation in an embodiment of the present invention.

[0025] In the figure: 1. pipe section one, 11. first end, 111. first step, 112. second step, 2. pipe section two, 21. groove, 3. waterproof protection device, 4. first layer water-stop structure, 41. metal water-stop, 42. rubber composite part, 5. second layer water-stop structure, 51. rubber body, 52. air bag, 521. air nozzle assembly, 522. air bag reinforcement curtain, 53. fixing device, 531. connecting plate, 532. pad, 533. limiting pressure plate, 534. fixing bolt, 54. high-pressure air pipe, 55. pressure gauge, 6. third layer water-stop structure, 61. OMEGA rubber water-stop, 611. first protrusion, 612. second protrusion, 62. fixed pressing device, 621. metal pressure plate, 622. nut, 623. metal support rod, 7. buffer device. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] To make the purpose, technical solution and advantages of the embodiments of the invention more clear, the following will be combined with the appended drawings of the embodiments of the invention to Figure 1-4 , clearly and completely describe the technical solutions of the embodiments of the invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0030] Example: like Figure 1 As shown, the sealing structure of the floating tunnel pipe joint of the present application includes a pipe joint 1 and a pipe joint 2, and also includes a multi-layer sealing structure that flexibly connects the pipe joint 1 and the pipe joint 2, the multi-layer sealing structure includes a waterproof protection device 3 that fixes the pipe joint 1 and the pipe joint 2, and a multi-layer water-stopping structure arranged on the inner side of the waterproof protection device 3, and the multi-layer water-stopping structure is connected between the pipe joint 1 and the pipe joint 2; the multi-layer water-stopping structure includes a first water-stopping structure 4, a second water-stopping structure 5 and a third water-stopping structure 6 in sequence from the outside direction of the pipe joint (GW) to the inside direction of the pipe joint (GN).

[0031] It should be noted that the multi-layer water-stopping structure in this embodiment is preferably a three-layer water-stopping structure.

[0032] Since the suspended tunnel is immersed in the deep sea all year round, and the sealing device of the suspended tunnel pipe joint generally contains rubber material, fish or other organisms may gnaw or destroy the rubber material. At the same time, due to the presence of various pollution sources in the sea water, especially the presence of some oils, acids, alkalis, iodine and other substances, the rubber material will be corroded to a certain extent, which will cause high-level harm over time. By setting the waterproof protection device 3 on the outermost layer of the multi-layer sealing structure, the inner three-layer water-stopping structure can be protected from direct contact with seawater, thereby avoiding chemical corrosion of the three-layer water-stopping structure by seawater, and effectively improving the sealing performance of the suspended tunnel pipe joint.

[0033] It should be noted that the waterproof protection device 3 is made of metal, and in this embodiment, it is preferably made of stainless steel. Due to the hydrostatic pressure and additional dynamic water pressure generated by the seawater acting on the suspended tunnel pipe section, the provision of this protective waterproof device 4 can also withstand a certain hydrostatic pressure and dynamic water pressure, thereby improving the compressive resistance of the suspended tunnel pipe section joints to a certain extent.

[0034] like Figure 1As shown, the first water stop structure 4 includes a metal water stop 41 and a rubber composite part 42 arranged at both ends of the metal water stop, the rubber composite part 42 is provided with threaded holes, and the first water stop structure 4 is fixedly connected between the pipe section 1 1 and the pipe section 2 2 through the threaded holes of the rubber composite part 42 and the bolts. Since the suspended tunnel is often affected by ocean waves in the deep sea, the static water pressure and additional dynamic water pressure generated by the sea water acting on the suspended tunnel pipe will also cause the change of the natural frequency and vibration mode of the structure and generate additional damping. With the increase of time, the bolts and the metal water stop will loosen seriously and may fall off, thereby causing the sealing failure of the first water stop structure 4. The present application sets the rubber composite part 42 at both ends of the metal water stop 41, so that the connection between the bolt and the metal water stop 41 has a certain flexibility, and the rubber composite part 42 will also buffer and absorb part of the vibration energy, which can effectively improve the reliability of the fixation of the bolt and the metal water stop 41.

[0035] like Figure 1 and Figure 3 As shown, the pipe segment 1 has a first end portion axially facing the pipe segment 2, and the end surface of the pipe segment 2 has a groove 21 corresponding to the first end portion 11 of the pipe segment 1. The first end portions 11 are evenly spaced along the circumference of the pipe segment 1, and one end of each pipe segment has the first end portion 11 and the other end has the groove 21. This is to fix the second water stop structure 5 between the pipe segment 1 and the pipe segment 2, so as to flexibly connect the pipe segment 1 and the pipe segment 2. When the suspended tunnel fluctuates greatly, the second water stop structure 5 can effectively stretch and squeeze to deform, thereby ensuring the sealing between the pipe segments.

[0036] like Figure 3 As shown, the second water-stopping structure 5 is arranged in the gap between the first end 11 of the pipe segment 1 and the groove 21 of the pipe segment 2. This arrangement is to flexibly connect the pipe segment 1 and the pipe segment 2. When the suspended tunnel fluctuates greatly, the second water-stopping structure 5 can effectively stretch and squeeze to deform, thereby ensuring the sealing between the pipe segments.

[0037] like Figure 3 and 4As shown in the figure, the second water stop structure 5 includes a rubber main body 51 and a fixing device 53. The fixing device 53 is provided with a connecting plate 531, a backing plate 532, a limiting plate 533 and fixing bolts 534. The fixing bolts 534 fix both ends of the second water stop structure 5 on the first end 11 of the first pipe section 1 and the bottom surface of the groove 52 of the second pipe section 2 in sequence through the limiting plate 533, the backing plate 532 and the connecting plate (531); when the suspended tunnel is affected by wave currents in the deep sea, it will undergo tension or extrusion. The second water stop structure is provided with a rubber main body with good elastic deformation performance, which can better buffer the impact on the connection between pipe sections, and thus ensure the sealing and waterproof performance between pipe sections. And there is a deformable interval left between the backing plate 532 and the rubber main body 51. When the suspended tunnel is subjected to external forces and the pipe joint sealing structure is squeezed, a certain space is left for the rubber main body to be squeezed and deformed, increasing the deformation range of the second water stop structure, making the connection more flexible, and being more conducive to improving the sealing performance of the pipe joint when the suspended tunnel undergoes large deformations.

[0038] When as Figure 3 shown, in the natural state, both the inner wall and the outer wall of the rubber main body 51 are concave inward. The cross-section of the rubber main body 51 is a hollow dumbbell shape, and the cross-section of the airbag 52 is a first ellipse; as Figure 4 shown, when the airbag is inflated, the concave parts of the inner wall and the outer wall of the rubber main body 51 expand outward. At this time, the cross-sectional area of the rubber main body 51 is a hollow rectangle, and the cross-section of the airbag 52 is a second ellipse; the area of the second ellipse is larger than the area of the first ellipse. Due to the internal air pressure of the central airbag 52 of the rubber main body 51 increasing with the service time, the rubber main body 51 will show permanent compression deformation and aging phenomena, and the internal air pressure will slowly decrease. However, by setting a section of high-pressure air pipe 54 outside the air nozzle assembly 521, indirect connection with the central airbag 52 can be achieved. Through the gas filling and stamping of the high-pressure air pipe 54, the pressure drop of the central airbag 52 of the rubber main body 51 can be supplemented, so as to better maintain the use function of the second water stop structure 5; that is, when the rubber main body 51 shows stress relaxation after long-term use and the height H of the rubber main body 51 is lower than the initial height H0 (i.e., H < H0), by inflating the airbag 52, when the height H1 of the rubber main body 51 after inflation is not lower than the initial height H0 (i.e., H < H0), the height and strength of the rubber main body 51 after stress relaxation in the second water stop structure 5 can be effectively compensated, and thus the effectiveness of the suspended tunnel pipe joint sealing structure can be ensured.

[0039] As Figure 3 and Figure 4 shown, the inner wall of the airbag 52 is provided with an airbag reinforcing cord fabric 522. Since the characteristics and number of layers of the airbag reinforcing cord fabric can determine the internal air pressure of the airbag 52, the purpose of setting the airbag reinforcing cord fabric 522 on the inner wall of the airbag 52 is to ensure the pressure-bearing strength of the airbag 52, thereby improving the compressive effect of the second water stop structure 5.

[0040] like Figure 3 and Figure 4 As shown, the air nozzle assembly 521 penetrates the rubber body 51 and connects the airbag 52 with the high-pressure air pipe 54. The high-pressure air pipe 54 is connected with a pressure gauge 55 and an inflation device for real-time monitoring of the pressure of the airbag and timely inflation and pressure replenishment so that the second water-stopping structure 5 reaches the required rigidity and strength, thereby ensuring the sealing performance of the second layer of water-stopping structure 5.

[0041] like Figure 1 As shown, the first end portion is also provided with a first step and a second step, and a buffer device 7 is provided on the first step and the second step to prevent the end face of the pipe segment 2 from colliding with the pipe segment 1. It is mainly used to resist the instantaneous impact of the suspended tunnel due to external conditions, and can effectively slow down the deformation speed of the three-layer water-stopping structure, and can effectively ensure the automatic recovery effect of the three-layer water-stopping structure.

[0042] like Figure 1 and Figure 2 As shown, the third water-stop structure includes an OMEGA rubber water-stop 61 and a fixed pressing device 62. The two fixed pressing plate devices 62 respectively connect the two first ends of the OMEGA rubber water-stop 61 to the pipe segment 1 and the pipe segment 2. The first end of the OMEGA rubber water-stop 61 is provided with a first protrusion 611 and a second protrusion 612; the fixed pressing device 62 contains a pressing plate 621, a bolt and nut set 622 and a metal support rod 623. The upper right end of the pressing plate 621 is also provided with a limit block, which is just stuck on the inner side of the second protrusion 612. When the nut is tightened, the metal support rod 623 acts as a fulcrum, thereby squeezing and deforming the first protrusion 611 of the first end of the OMEGA rubber water-stop 61 to be tightly attached to the inner wall of the pipe segment 1. By setting a third water-stop structure 6 in the innermost layer of the two pipe sections, and cleverly setting a fixed pressing device 62 in the third water-stop structure 6 through the lever principle, the OMEGA rubber water-stop belt is pressed between the pipe section 1 and the pipe section 2 through the limit block. The OMEGA rubber water-stop belt 61 can be replaced or installed inside the suspended tunnel by adjusting the tightness of the nut, which is quick and easy to operate.

[0043] The present application also provides a sealing method for a suspended tunnel pipe joint. According to the load-bearing and deformation requirements of the sealing structure of the suspended tunnel pipe joint under extreme working conditions, a waterproof protection device 3 is added to the outside of the three-layer water-stopping structure, so that the three-layer water-stopping structure can maintain the sealing and water-stopping function under extreme working conditions; the height is adjusted by adjusting the pressure of the airbag 52 of the second water-stopping structure 5 to adjust the pre-compression amount and initial stiffness of the second water-stopping structure 5, so that the second water-stopping structure 5 can maintain the sealing and water-stopping function under extreme working conditions.

[0044] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Technicians in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A floating tunnel pipe joint sealing structure, comprising a pipe section 1 (1) and a pipe section 2 (2), characterized in that: It also includes a multi-layer sealing structure for flexibly connecting the first pipe segment (1) and the second pipe segment (2), the multi-layer sealing structure including a waterproof protection device (4) fixed to the first pipe segment (1) and the second pipe segment (2), and a multi-layer water-stopping structure arranged inside the waterproof protection device (4), the multi-layer water-stopping structure connecting the first pipe segment (1) and the second pipe segment (2); the multi-layer water-stopping structure includes a first water-stopping structure (4), a second water-stopping structure (5) and a third water-stopping structure (6) in sequence from the outer direction (GW) of the pipe segment to the inner direction (GN) of the pipe segment.

2. The sealing structure of the floating tunnel pipe joint according to claim 1 is characterized in that: The first water-stop structure (4) comprises a metal water-stop strip (41) and a rubber composite part (42) arranged at both ends of the metal water-stop strip (41); the rubber composite part (42) is provided with a threaded hole; the first water-stop structure (4) is fixedly connected between the first pipe section (1) and the second pipe section (2) by means of the threaded holes of the rubber composite part (42) in cooperation with bolts.

3. The sealing structure of the floating tunnel pipe joint according to claim 2 is characterized in that: The pipe segment one (1) has a first end portion (11) protruding axially toward the pipe segment two (2), and the end surface of the pipe segment two (2) has a groove (21) corresponding to the first end portion (11) of the pipe segment one (1), and the first end portions (11) are evenly spaced along the circumference of the pipe segment one (1), and each pipe segment has a first end portion (11) at one end and a groove (21) at the other end.

4. The sealing structure of the floating tunnel pipe joint according to claim 3 is characterized in that: The second water-stopping structure (5) is arranged in the gap between the first end (11) of the first pipe segment (1) and the groove (21) of the second pipe segment (2).

5. The sealing structure of the floating tunnel pipe joint according to claim 4 is characterized in that: The second water-stopping structure (5) comprises a rubber body (51) and a fixing device (53); the fixing device (53) is provided with a connecting plate (531), a pad (532), a limiting plate (533) and a fixing bolt (534); the fixing bolt (534) fixes the two ends of the second water-stopping structure (5) to the first end portion (11) of the first pipe segment (1) and the bottom surface of the groove (52) of the second pipe segment (2) via the limiting plate (533), the pad (532) and the connecting plate (531) in sequence; a deformable gap is left between the pad (532) and the rubber body (51).

6. The sealing structure of the floating tunnel pipe joint according to claim 5 is characterized in that: The second water-stopping structure (5) further comprises an air bag (52) arranged at the center of the rubber body (51); an air nozzle assembly (521) is also arranged on the air bag (52); the air nozzle assembly (521) penetrates the rubber body (51) and connects the air bag (52) with a high-pressure air pipe (54); the high-pressure air pipe (54) is connected to a pressure gauge (55) for monitoring the air pressure of the air bag and an inflation device.

7. The sealing structure of the floating tunnel pipe joint according to claim 6 is characterized in that: An airbag reinforcement curtain (522) is provided on the inner wall of the airbag (52).

8. The sealing structure of the floating tunnel pipe joint according to claim 7 is characterized in that: The first end portion (11) is further provided with a first step (111) and a second step (112), and a buffer device (7) is provided on the first step (111) and the second step (112) to prevent the end surface of the second pipe segment (2) from colliding with the first pipe segment (1).

9. The sealing structure of the floating tunnel pipe joint according to claim 1, characterized in that: The third water-stop structure comprises a rubber water-stop strip (51) and a fixed pressure plate device (53), and the two fixed pressure plate devices (53) respectively connect the two ends of the rubber water-stop strip (51) to the pipe section one (1) and the pipe section two (2).

10. A method for sealing a floating tunnel pipe joint, using the floating tunnel pipe joint sealing structure according to any one of claims 1 to 9, characterized in that: According to the load-bearing and deformation requirements of the floating tunnel pipe joint sealing structure under extreme working conditions, a waterproof protection device (4) is added to the outside of the multi-layer water-stopping structure, so that the multi-layer water-stopping structure can maintain the sealing and water-stopping function under extreme working conditions; an air bag (52) is provided in the second water-stopping structure (5), and the height of the second water-stopping structure (5) is adjusted by controlling the pressure in the air bag (52), so as to adjust the pre-compression amount and initial stiffness of the second water-stopping structure (52), so that the second water-stopping structure (52) can maintain the sealing and water-stopping function under extreme working conditions.

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