Immersed tube final joint

Abstract

The utility model relates to a final joint of an immersed tube, which belongs to the field of tunnel construction and comprises a tube section, an expansion section, a push-out section, a push component, a waterstop and a retainer ring structure. A channel is formed in the pipe section in the length direction of the pipe section. The expansion section is arranged at one end of the pipe section in the length direction. The push-out section is arranged in the expansion section. The pushing assembly is used for pushing the push-out section to move in the length direction of the pipe section. The push-out section is sleeved with the water stop belt. The two ends of the water stop belt are connected to the peripheral wall of the push-out section and the end wall of the expansion section correspondingly. The check ring structure is arranged on the end wall, facing the water stop belt, of the push-out section. The check ring structure is located between the water stop belt and the push-out section. The check ring structure comprises a blocking piece, a first spring piece and a connecting assembly. The push-out section is sleeved with the blocking piece, and the blocking piece inclines towards the direction of the push-out section to the direction away from the pipe section section. The first spring piece is attached to the side, facing the expansion section, of the blocking piece. The connecting assembly fixes the blocking piece and the first spring piece to the expansion section.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel construction, in particular to a final joint of an immersed tube. Background Art

[0002] Immersed tube joints are a critical component of immersed tube tunnel construction, connecting adjacent pipe segments or sections. Based on their stress characteristics and functions, immersed tube tunnel joints can be categorized as segment joints, segment joints, and final joints. Based on their location, they can be further categorized as segment-type joints and segment-type joints. The final joint, specifically, bridges the gap at the end of the last pipe segment after the prefabricated pipe segments are assembled underwater during immersed tube construction. It is the closing joint that connects all pipe segments together.

[0003] In the prior art, the final joint consists of an expansion section and a push-out section, with the push-out section positioned within the expansion section. Once the final pipe joint is in place, the push-out section extends and docks with the corresponding pipe joint. To prevent water ingress, a waterstop is installed at the junction of the push-out and expansion sections, sealing the gap between them.

[0004] However, during construction, testing is performed above water, and the push-out section is extended and retracted. During this process, the waterstop may become trapped in the gap between the push-out section and the expansion section, causing damage to the waterstop or even causing the structure to become stuck. Utility Model Content

[0005] To address the shortcomings of related technologies, the present invention provides a final immersed tube joint. A retaining ring structure blocks the extension section as it retracts into the expansion section, preventing the waterstop from becoming trapped in the gap during extension and retraction. This improves the joint's reliability and durability. Furthermore, a first spring leaf supports the retaining element, preventing it from failing or being damaged. This addresses the technical issue of waterstops being easily trapped in gaps, a problem that exists in existing technologies.

[0006] The utility model provides an immersed tube final joint, comprising:

[0007] A pipe segment, wherein a channel is provided in the pipe segment along its length, and both ends of the pipe segment have openings communicating with the channel;

[0008] The expansion section is arranged at one end of the tube stage in the length direction, and the opening size of the expansion section is larger than the opening size of the tube stage;

[0009] a push-out section, the push-out section being disposed in the expansion section;

[0010] A pushing assembly, the pushing assembly being used to push the pushing section to move along the length direction of the pipe segment;

[0011] A waterstop, which is sleeved on the push-out section; two ends of the waterstop are respectively connected to the outer peripheral wall of the push-out section and the end wall of the expansion section;

[0012] A retaining ring structure is provided on the end wall of the push-out section facing the waterstop; and the retaining ring structure is located between the waterstop and the push-out section; the retaining ring structure includes:

[0013] a stopper, the stopper being sleeved on the pushing section and the stopper being inclined in a direction away from the pipe segment in a direction toward the pushing section;

[0014] a first spring sheet, the first spring sheet being attached to a side of the stopper facing the expansion section;

[0015] A connecting assembly is provided for fixing the stopper and the first spring piece to the expansion section.

[0016] In the technical solution, a retaining ring structure is used to prevent the waterstop from being caught in the gap during the extension and retraction of the push-out section, thereby improving the reliability and durability of the joint. In addition, the first spring leaf is used to support the retaining member, preventing it from failing or being damaged.

[0017] In some embodiments, the stopper includes:

[0018] a first connecting portion, the first connecting portion being used for connecting the connecting assembly to the expansion section;

[0019] A first inclined portion is connected to the first connecting portion, and the first inclined portion is inclined from a direction toward the pushing section toward a direction away from the pipe segment.

[0020] In the technical solution, the design of the first inclined portion helps the baffle to smoothly guide the waterstop when the pushing section moves, preventing it from being clamped in the gap.

[0021] In some embodiments, the blocking member further includes a curved portion connected to an end of the first inclined portion away from the first connecting portion; the center of the curved portion faces a side away from the expansion section.

[0022] In the technical solution, the curved portion further enhances the flexibility and smoothness of the baffle in guiding the waterstop, reducing the risk of the waterstop being caught in the gap.

[0023] In some embodiments, the first spring piece includes a second connecting portion and a second inclined portion, the second connecting portion is attached to the first connecting portion, and the second inclined portion is attached to the first inclined portion.

[0024] In the technical solution, the spring sheet can fit tightly against the stopper, providing sufficient elasticity and support force to ensure that the waterstop remains stable when the push-out section moves.

[0025] In some embodiments, a second spring piece is attached to a side of the first spring piece away from the blocking member.

[0026] In the technical solution, this double-layer spring sheet design further enhances the elasticity and supporting force around the waterstop, improving the sealing effect and durability of the waterstop.

[0027] In some embodiments, the second spring piece includes a third connecting portion and a third inclined portion, the third connecting portion is attached to the second connecting portion, and the third inclined portion is attached to the second inclined portion.

[0028] In the technical solution, the two layers of spring leaves are enabled to work together to provide better elasticity and support effects, ensuring the stability and sealing of the waterstop under complex working conditions.

[0029] In some embodiments, the first spring piece is made of manganese copper;

[0030] The second spring piece is made of manganese steel.

[0031] The technical solution utilizes different materials to ensure the first and second spring leaves possess both sufficient elasticity and durability to withstand the complex underwater environment. The double-layered spring leaves offer high elasticity and strength, supporting the transitional compression of the ultra-high polymer retaining ring. Furthermore, their elastic deformation can accommodate deviations in the ejection section during ejection.

[0032] In some embodiments, the length of the third inclined portion is smaller than the length of the second inclined portion.

[0033] In the technical solution, the length of the third inclined portion is smaller than that of the second inclined portion. This design allows the second spring sheet to provide elasticity and support force without excessively restricting the movement of the ejection section, thereby ensuring the flexibility and reliability of the joint.

[0034] In some embodiments, the connection assembly includes a threaded connection member, which passes through the first connection portion, the second connection portion, and the third connection portion in sequence and is then threadedly connected to the expansion section.

[0035] In the technical solution, this design enables the retaining ring structure and the spring leaf to be firmly fixed on the expansion section, thereby improving the overall stability and durability of the joint.

[0036] In some embodiments, the connection assembly further includes a pad, which is disposed on a side of the first connection portion away from the expansion section; and the threaded connection member also passes through the pad.

[0037] In the technical solution, the stability and reliability of the connection assembly are further enhanced, and the problem of joint failure caused by loosening of the threaded connection is prevented.

[0038] Based on the above technical solution, in the embodiment of the present invention, a retaining ring structure is used to prevent the waterstop from being caught in the gap during the extension and retraction of the push-out section, thereby improving the reliability and durability of the joint. Furthermore, the first spring leaf is used to support the retaining member, preventing it from failing or being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0040] Figure 1 This is a schematic diagram of the overall cross-sectional structure of an embodiment of the immersed tube final joint of the present invention when the push-out section is retracted;

[0041] Figure 2 This is a schematic cross-sectional view of the anti-sagging suspension device when the push-out section of an embodiment of the immersed tube final joint is retracted;

[0042] Figure 3 This is a schematic diagram of the overall cross-sectional structure of an embodiment of the immersed tube final joint of the present invention after the push-out section is pushed out;

[0043] Figure 4 This is a schematic cross-sectional view of the anti-sagging suspension device after the push-out section of an embodiment of the immersed tube final joint of the present invention is pushed out;

[0044] Figure 5 This is a schematic structural diagram of a sealing and fixing device on a push-out section of an embodiment of an immersed tube final joint of the utility model;

[0045] Figure 6 This is a schematic structural diagram of a sealing and fixing device on an expansion section of an embodiment of an immersed tube final joint of the present utility model;

[0046] Figure 7 This is a cross-sectional view of an embodiment of the immersed tube final joint of the utility model;

[0047] Figure 8 This is a cross-sectional view of the retaining ring structure of an embodiment of the immersed tube final joint of the present invention;

[0048] Figure 9 This is a cross-sectional view of an embodiment of the immersed tube final joint of the utility model;

[0049] Figure 10 This is a cross-sectional view of the retaining ring structure of an embodiment of the immersed tube final joint of the present invention;

[0050] Figure 11 This is a cross-sectional view of the retaining ring structure of an embodiment of the immersed tube final joint of the present invention.

[0051] In the picture:

[0052] 100, pipe segment; 200, expansion section; 300, push-out section; 310, sealing and fixing device; 320, pressure plate; 330, pressure strip; 340, fastening bolt assembly; 350, water stop; 400, baffle; 401, first connecting part; 402, first inclined part; 403, bending part; 500, first spring leaf; 501, second connecting part; 502, second inclined part; 600, second spring leaf; 601, third connecting part; 602, third inclined part; 700, threaded connection; 800, spacer; 900, anti-sagging suspension device; 910, support rod; 920, suspension assembly; 930, sliding part; 940, elastic part; 950, lifting ring. DETAILED DESCRIPTION

[0053] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0054] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] The terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of such features.

[0056] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0057] As attached Figures 1 to 6 As shown, in an exemplary embodiment of the immersed tube final joint of the present invention, the final joint comprises: a pipe segment 100, an expansion segment 200, a push-out segment 300, a pushing assembly, a waterstop 350, and an anti-sagging suspension device 900. A channel is defined along the length of the pipe segment 100, with openings at both ends communicating with the channel. The expansion segment 200 is disposed at one end of the pipe segment along its length, with the opening of the expansion segment 200 being larger than the opening of the pipe segment. The push-out segment 300 is disposed within the expansion segment 200. The pushing assembly is used to propel the push-out segment 300 along the length of the pipe segment 100. The waterstop 350 is sleeved over the push-out segment 300. The ends of the waterstop 350 are sealed to the outer circumferential wall of the push-out segment 300 and the end wall of the expansion segment 200, respectively.

[0058] In some embodiments, the pushing assembly may include a hydraulic cylinder. The hydraulic cylinder includes a cylinder body and a piston rod, and the piston rod is slidably connected to the cylinder body. The piston rod pushes out or pulls the pushing section 300 to achieve movement of the pushing section 300.

[0059] In some embodiments, the push-out section 300 is configured in a rectangular tubular shape. The waterstop 350 is also configured in a rectangular tubular shape. The waterstop 350 has a highly elastic thin-walled structure. When the push-out section 300 is pushed out, the waterstop 350 adheres to the outer surface of the push-out section 300 under the action of water pressure, only bearing pressure without tension, ensuring that the waterstop 350 will not be torn.

[0060] There is at least one anti-sag suspension device 900, which is installed on the expansion section 200, preferably on the expansion section 200 located on the top side of the immersed tube final joint. The anti-sag suspension device 900 is connected to the middle of the waterstop 350, suspending the waterstop 350 from the expansion section 200.

[0061] like Figure 2 as well as Figure 4As shown, the anti-sag suspension device 900 includes a support rod 910 and a suspension assembly 920 mounted on the support rod 910. The suspension assembly 920 includes a sliding member 930 and an elastic member 940. One end of the support rod 910 is connected to the same end wall where the expansion section 200 and the waterstop 350 are connected, and the other end extends axially toward the push-out section 300. The length and diameter of the support rod 910 are set based on the push-out stroke of the push-out section 300, and the length must be at least equal to the push-out stroke of the push-out section 300. At least one suspension assembly 920 is provided, and the specific number is determined by the axial length of the waterstop 350. The sliding member 930 is mounted on the support rod 910 and can slide back and forth along the support rod 910. The elastic member 940 is stretchable, with one end connected to the sliding member 930 and the other end connected to the middle of the waterstop 350. The length of the elastic member 940 before deformation is less than the distance between the support rod 910 and the push-out section 300.

[0062] Through the above scheme, the anti-sagging suspension device 900 is provided on the expansion section 200, and the waterstop 350 is connected to the expansion section 200. The waterstop 350 is suspended and connected to the expansion section 200. When the push-out section 300 is pushed out or retracted, the sliding member 930 and the elastic member 940 involve the stretching and compression of the waterstop 350, limiting the suspension deformation of the waterstop 350, making its stretching or compression uniform and regular, and the anti-sagging suspension device 900 can serve as a reinforcement rib of the waterstop 350, improving the reliability of the waterstop 350, and avoiding the waterstop 350 from being able to smoothly push out the push-out section 300 or poor water-stopping at the joint due to the large suspension deformation of the waterstop 350 due to its own weight.

[0063] In some embodiments, one end of the support rod 910 facing the ejection direction of the ejection section 300 is bent away from the ejection section 300 , for example, into an arcuate hook shape, and the end of the arcuate hook shape prevents the sliding member 930 from sliding off the support rod 910 .

[0064] In some embodiments, at least four anti-sag suspension devices 900 are provided, and the anti-sag suspension devices 900 are evenly distributed on the end wall of the expansion section 200. That is, the upper and lower surfaces and both side surfaces of the waterstop 350 are suspended and connected to the expansion section 200 through the anti-sag suspension devices 900, so that the waterstop 350 is restrained at least on all four sides, the sag deformation and reinforcement of the waterstop 350 are more uniform, and the waterstop 350 can be pushed out or retracted more smoothly.

[0065] In some embodiments, the support rod 910 is a cylindrical rod, the sliding member 930 is a circular ring, and the ring diameter of the sliding member 930 is larger than the outer diameter of the support rod 910 , so that the sliding member 930 can move more smoothly on the support rod 910 .

[0066] Furthermore, the support rod 910 can be a rod with light weight and high rigidity. The sliding member 930 is configured as a ring slightly larger than the outer diameter of the support rod 910.

[0067] In some embodiments, the elastic member 940 is an elastic cord, and the waterstop 350 is provided with a corresponding number of rings 950 as the number of the elastic cords, and the elastic cords are connected to the waterstop 350 through the rings 950. When the waterstop 350 is moved by the push-out section 300, the elastic member 940 can be stretched, allowing the waterstop 350 to have a certain degree of elastic deformation freedom, effectively reducing the tensile deformation of the waterstop 350 itself, and preventing the waterstop 350 from being pulled and torn by the rigid suspension.

[0068] Furthermore, both ends of the elastic rope are rope buckles, which are cross-linked with the circular ring of the sliding member 930 and the hanging ring 950 on the water stop belt 350 respectively.

[0069] In some embodiments, as Figure 5 as well as Figure 6 As shown, the connection between the waterstop 350 and the expansion section 200 and the push-out section 300 is provided with a sealing fixing device 310, that is, the two ends of the waterstop 350 are sealed with the expansion section 200 and the push-out section 300 through a sealing fixing device 310. The sealing fixing device 310 includes a pressure plate 320, a pressure strip 330 and a fastening bolt assembly 340. The pressure plate 320 is arranged at the outer periphery of the end of the waterstop 350, and the pressure strip 330 is arranged between the pressure plate 320 and the waterstop 350. Therefore, the pressure strip 330 and the pressure plate 320 are both circular ring components as a whole. The pressure plate 320 is connected to the expansion section 200 or the push-out section 300 sealed with the waterstop 350 through the fastening bolt assembly 340 and presses the pressure strip 330, and the pressure strip 330 presses the end of the waterstop 350.

[0070] In some embodiments, the cross-section of the pressure plate 320 is L-shaped, with one end of the L-shaped short arm of the pressure plate 320 pressing against the expansion section 200 or the push-out section 300 to which the waterstop 350 is sealed. The middle portion of the L-shaped long arm of the pressure plate 320 is connected to the expansion section 200 or the push-out section 300 to which the waterstop 350 is sealed via a fastening bolt assembly 340, and the end of the L-shaped long arm of the pressure plate 320 presses against the pressure strip 330. The L-shape of the pressure plate 320 and a group of fastening bolts in the fastening bolt assembly 340 form a lever structure, and the tightness is adjusted by the fastening bolts to fully compress the waterstop 350 and ensure that the fitting surface is watertight.

[0071] In some embodiments, the L-shaped long arm end of the pressure plate 320 is provided with a matching concave-convex structure on the side adjacent to the pressure strip 330, and the L-shaped long arm end of the pressure plate 320 is pressed against the pressure strip 330 by another set of fastening bolts in the fastening bolt assembly 340. The matching concave-convex structure makes the pressure strip 330 and the pressure plate 320 bite together to prevent the pressure strip 330 from shifting.

[0072] In some embodiments, a serrated protrusion is provided on the inner side of the water stop 350 corresponding to the compressed portion of the pressure strip 330 and in contact with the pushing section 300 .

[0073] Furthermore, the contact surface of the pushing section 300 or the expanding section 200 is provided with a matching serrated groove.

[0074] In some embodiments, both ends of the water stop 350 are circular cross-section retaining rings, which are disposed between the bead 330 and the first fastening bolt. By clamping the retaining ring between the bead 330 and the first fastening bolt, the water stop 350 is further prevented from being pulled away from the bead 330.

[0075] Through the description of multiple embodiments of the immersed tube final joint of the present invention, it can be seen that the embodiments of the immersed tube final joint of the present invention have at least one or more of the following advantages:

[0076] 1. By installing an anti-sagging suspension device 900 on the expansion section 200, the waterstop 350 is connected to the expansion section 200. The waterstop 350 is suspended on the expansion section 200. When the push-out section 300 is pushed out or retracted, the sliding member 930 and the elastic member 940 pull the waterstop 350 in tension and compression, limiting the overhang deformation of the waterstop 350 and ensuring uniform and regular stretching or compression. The anti-sagging suspension device 900 also serves as a reinforcement for the waterstop 350, improving its reliability and preventing the waterstop 350 from being smoothly pushed out or poorly sealed at the joint due to the waterstop 350's significant overhang deformation due to its own weight.

[0077] 2. By using a sealing and fastening device based on the lever principle at both ends of the waterstop 350, the waterstop 350 is reliably sealed and fastened to the push-out section 300 and the expansion section 200, which can ensure that the waterstop 350 is driven to stretch or compress evenly and stably, thereby ensuring that the push-out section 300 is pushed out smoothly and that the final joint of the immersed tube is watertight.

[0078] Referring to all the accompanying drawings, an illustrative embodiment of the immersed tube final joint of the present invention includes: a pipe segment 100, an expansion segment 200, a push-out segment 300, a push assembly, a waterstop 350, and a retaining ring structure. A channel is defined along the length of the pipe segment 100, with openings at both ends communicating with the channel. The expansion segment 200 is located at one end of the pipe segment, with the opening of the expansion segment 200 being larger than the opening of the pipe segment. The push-out segment 300 is disposed within the expansion segment 200. The push assembly is used to propel the push-out segment 300 along the length of the pipe segment 100. The waterstop 350 is mounted over the push-out segment 300. The ends of the waterstop 350 are connected to the outer peripheral wall of the push-out segment 300 and the end wall of the expansion segment 200, respectively.

[0079] The retaining ring structure is located on the end wall of the push-out section 300 facing the waterstop 350 and is positioned between the waterstop 350 and the push-out section 300. The retaining ring structure includes a retaining member 400, a first spring leaf 500, and a connecting assembly. The retaining member 400 is positioned over the push-out section 300 and is tilted away from the pipe segment 100, toward the push-out section 300. The first spring leaf 500 is attached to the side of the retaining member 400 facing the expansion section 200. The connecting assembly secures the retaining member 400 and the first spring leaf 500 to the expansion section 200.

[0080] With the above solution, the retaining ring structure provides a barrier, preventing the waterstop 350 from being caught in the gap during the extension and retraction of the push-out section 300, thereby improving the reliability and durability of the joint. Furthermore, the first spring leaf 500 supports the stopper 400, preventing failure or damage to the stopper 400.

[0081] In some embodiments, the pushing assembly may include a hydraulic cylinder. The hydraulic cylinder includes a cylinder body and a piston rod, and the piston rod is slidably connected to the cylinder body. The piston rod pushes out or pulls the pushing section 300 to achieve movement of the pushing section 300.

[0082] In some embodiments, the ejection section 300 is configured in a rectangular tubular shape. The stopper 400 is also configured in a rectangular tubular shape. The stopper 400 is sleeved around the ejection section 300.

[0083] In some embodiments, the stopper 400 includes a first connecting portion 401 , and the first connecting portion 401 is used to connect the assembly to the expansion section 200 .

[0084] Furthermore, the first connecting portion 401 is parallel to the end wall of the expansion section 200 to facilitate stability after connection.

[0085] In some embodiments, the stopper 400 further includes a first inclined portion 402 connected to the first connecting portion 401. The first inclined portion 402 is inclined from the direction toward the ejection section 300 toward the direction away from the pipe segment 100. The design of the first inclined portion 402 helps the stopper 400 to smoothly guide the waterstop 350 when the ejection section 300 moves, preventing it from being caught in gaps.

[0086] Furthermore, the first connecting portion 401 and the first inclined portion 402 are integrally formed, thereby improving the strength of the structure and preventing breakage.

[0087] In some embodiments, the stopper 400 further includes a curved portion 403 connected to the end of the first inclined portion 402 away from the first connecting portion 401; the center of the curved portion 403 faces the side away from the expansion section 200. The curved portion 403 further enhances the flexibility and smoothness of the stopper 400 in guiding the waterstop 350, reducing the risk of the waterstop 350 being caught in gaps.

[0088] In some embodiments, the bent portion 403 is integrally formed with the first inclined portion 402 and the first connecting portion 401 to improve the overall structural strength of the blocking member 400 .

[0089] In some embodiments, the end of the curved portion 403 away from the first inclined portion 402 is spherical, thereby avoiding scratching the push-out section 300 or the water stop 350 .

[0090] In some embodiments, the first spring piece 500 includes a second connecting portion 501 , and the second connecting portion 501 is attached to a side of the first connecting portion 401 facing the expansion section 200 .

[0091] Furthermore, the second connecting portion 501 is parallel to the first connecting portion 401. The second connecting portion 501 improves the connection effect and stability with the first connecting portion 401 and the expansion section 200.

[0092] In some embodiments, the first spring piece 500 includes a second inclined portion 502, which fits closely to the first inclined portion 402. The spring piece can fit closely to the stopper 400, providing sufficient elasticity and support to ensure that the waterstop 350 remains stable when the push-out section 300 moves.

[0093] In some embodiments, a second spring sheet 600 is attached to the side of the first spring sheet 500 away from the stopper 400. This double-layer spring sheet design further enhances the elasticity and support force around the waterstop 350, improving the sealing effect and durability of the waterstop 350.

[0094] In some embodiments, the second spring piece 600 includes a third connecting portion 601 , and the third connecting portion 601 is attached to the second connecting portion 501 .

[0095] Furthermore, the third connecting portion 601 is parallel to the second connecting portion 501 , thereby improving the connection stability among the first spring piece 500 , the second spring piece 600 and the blocking member 400 .

[0096] In some embodiments, the second spring sheet 600 includes a third inclined portion 602, which is attached to the second inclined portion 502. This allows the two layers of spring sheets to work together to provide better elasticity and support, ensuring the stability and sealing of the waterstop 350 under complex working conditions.

[0097] In some embodiments, the first spring leaf 500 is made of manganese bronze, while the second spring leaf 600 is made of manganese steel. This choice of materials ensures that the first and second spring leaves 500 and 600 possess both sufficient elasticity and durability, adapting to the complex underwater environment. The double-layered spring leaves offer high elasticity and strength, supporting the transitional compression of the ultra-high polymer retaining ring. Furthermore, their elastic deformation can accommodate deviations in the ejection section 300 during ejection.

[0098] In some embodiments, the length of the third inclined portion 602 is less than that of the second inclined portion 502. This allows the second spring piece 600 to provide elasticity and support without excessively restricting the movement of the ejection section 300, thereby ensuring the flexibility and reliability of the joint.

[0099] In some embodiments, the connection assembly includes a threaded connector 700, which sequentially passes through the first connecting portion 401, the second connecting portion 501, and the third connecting portion 601, and is then threadedly connected to the expansion section 200. This design allows the retaining ring structure and the spring leaf to be securely fixed to the expansion section 200, improving the overall stability and durability of the joint.

[0100] Furthermore, a plurality of threaded connectors 700 are provided at intervals around the edge of the stopper 400 to achieve stable fixation of the retaining ring structure on the expansion section 200 .

[0101] In some embodiments, the connection assembly further includes a spacer 800, which is disposed on the side of the first connection portion 401 away from the expansion section 200. The threaded connector 700 also extends through the spacer 800. Specifically, the threaded connector 700 extends through the spacer 800, the first connection portion 401, the second connection portion 501, and the third connection portion 601, and then is threadedly connected to the expansion section 200. This further enhances the stability and reliability of the connection assembly and prevents joint failure caused by loosening of the threaded connector 700.

[0102] In some embodiments, the spacer 800 may be a long strip, and the plurality of threaded connectors 700 all pass through one spacer 800 , thereby improving the effect of pressing the stopper 400 against the expansion section 200 .

[0103] In some embodiments, the spacer 800 may be in the shape of a rectangular ring, which is sleeved on the pushing section 300 and connected to the expansion section 200 , further improving the effect of pressing the stopper 400 against the expansion section 200 .

[0104] Through the description of multiple embodiments of the immersed tube final joint of the present invention, it can be seen that the embodiments of the immersed tube final joint of the present invention have at least one or more of the following advantages:

[0105] 1. The retaining ring structure prevents the water stop 350 from being caught in the gap during the extension and retraction of the push-out section 300, thereby improving the reliability and durability of the joint. The first spring leaf 500 also supports the stopper 400 to prevent failure or damage to the stopper 400.

[0106] 2. The double-layer spring leaf has high elasticity and strength, supporting the transition compression of the ultra-high polymer retaining ring. At the same time, its elastic deformation can adapt to the impact caused by the deviation of the ejection section 300 during the ejection procedure.

[0107] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0108] The above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention. They should all be included in the scope of the technical solution for which protection is requested in the present invention.

Claims

1. A final joint of an immersed tube, characterized in that: include: A pipe segment, wherein a channel is provided in the pipe segment along its length, and both ends of the pipe segment have openings communicating with the channel; The expansion section is arranged at one end of the tube stage in the length direction, and the opening size of the expansion section is larger than the opening size of the tube stage; a push-out section, the push-out section being disposed in the expansion section; A pushing assembly, the pushing assembly being used to push the pushing section to move along the length direction of the pipe segment; A waterstop, which is sleeved on the push-out section; two ends of the waterstop are respectively connected to the outer peripheral wall of the push-out section and the end wall of the expansion section; A retaining ring structure is provided on the end wall of the push-out section facing the waterstop; and the retaining ring structure is located between the waterstop and the push-out section; the retaining ring structure includes: a stopper, the stopper being sleeved on the pushing section and the stopper being inclined in a direction away from the pipe segment in a direction toward the pushing section; a first spring sheet, the first spring sheet being attached to a side of the stopper facing the expansion section; A connecting assembly is provided for fixing the stopper and the first spring piece to the expansion section.

2. The immersed tube final joint according to claim 1, characterized in that: The blocks include: a first connecting portion, the first connecting portion being used for connecting the connecting assembly to the expansion section; A first inclined portion is connected to the first connecting portion, and the first inclined portion is inclined from a direction toward the pushing section toward a direction away from the pipe segment.

3. The immersed tube final joint according to claim 2, characterized in that: The blocking member further includes a curved portion connected to an end of the first inclined portion away from the first connecting portion; the center of the curved portion faces a side away from the expansion section.

4. The immersed tube final joint according to claim 3, characterized in that: The first spring piece includes a second connecting portion and a second inclined portion, the second connecting portion is attached to the first connecting portion, and the second inclined portion is attached to the first inclined portion.

5. The immersed tube final joint according to claim 4, characterized in that: A second spring piece is attached to a side of the first spring piece away from the blocking member.

6. The immersed tube final joint according to claim 5, characterized in that: The second spring piece includes a third connecting portion and a third inclined portion. The third connecting portion is attached to the second connecting portion, and the third inclined portion is attached to the second inclined portion.

7. The immersed tube final joint according to claim 6, characterized in that: The first spring piece is made of manganese copper; The second spring piece is made of manganese steel.

8. The immersed tube final joint according to claim 7, characterized in that: The length of the third inclined portion is smaller than that of the second inclined portion.

9. The immersed tube final joint according to claim 8, characterized in that: The connection assembly includes a threaded connection piece, which passes through the first connection part, the second connection part and the third connection part in sequence and is then threadedly connected to the expansion section.

10. The immersed tube final joint according to claim 9, characterized in that: The connection assembly further includes a pad, which is arranged on a side of the first connection portion away from the expansion section; the threaded connection piece also passes through the pad.

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