Double plug-in pipe joint for immersed tunnel and construction method

Abstract

The application provides a double-insertion type immersed tube joint for an immersed tube tunnel, comprising a guide section, a sleeve section arranged opposite to the guide section, a moving section located in the guide section and capable of being pushed out to be connected with the sleeve section, wherein the guide section and the sleeve section are sleeved with two ends of the moving section respectively, and a ring-shaped sealing device, wherein the guide section and the sleeve section are collectively referred to as a fixed part, the sealing device comprises a ring-shaped pressure capsule located on the fixed part, the pressure capsule has a capsule cavity capable of being filled with pressure medium to expand, and a sealing layer is formed between the fixed part and the moving section respectively.

Description

Technical Field

[0001] This application belongs to the field of underwater tunnel construction engineering and relates to a double-insertion immersed tube joint and construction method for immersed tube tunnels. Background Technology

[0002] Immersed tunnels are a common structural form for underwater tunnels. Their construction method involves prefabricating and sinking individual tunnel sections, which are then joined underwater to form the tunnel. Rubber watertight sealant is used at the joints, compressed by water pressure to create a watertight seal. Because the final joint cannot be sealed using the same hydraulic pressure as other sections, a specially designed final joint is required for sealing. A conventional push-out final joint typically includes a guide section and a moving section. After sinking, the moving section is pushed outward from the guide section, allowing its front end to connect with the already installed tunnel section, thus completing the underwater connection and connection of the entire tunnel.

[0003] like Figure 1 As shown, CN215165824U discloses a final joint docking mechanism for immersed tunnels, which includes a buried section tunnel 1' with an enlarged head 9' (i.e., a guide section), a prefabricated pipe section 2' (i.e., a moving section) located in the enlarged head 9', and an immersed pipe section 3' capable of docking with the prefabricated pipe section 2'; wherein, a telescopic waterstop 8' is provided between the enlarged head 9' and the prefabricated pipe section 2'; the end of the prefabricated pipe section 2' is equipped with a GINA waterstop, which can dock with the immersed pipe section 3' to achieve a sealed and isolated connection between the two relative to external water.

[0004] Because there will always be errors in the prefabrication dimensions and immersion installation positions of prefabricated pipe sections and immersed pipe sections, the final joint structure and working mechanism must be able to accommodate the errors present at the docking end. Therefore, in existing technologies such as CN215165824U, the requirements for the prefabrication dimensions of various pipe sections and the immersion installation positions are high, resulting in high construction accuracy requirements and construction difficulty. Summary of the Invention

[0005] This application provides a double-insertion immersed tube joint and construction method for immersed tube tunnels, which allows for larger docking errors during the construction of the immersed tube joint, thereby reducing construction difficulty and cost.

[0006] The first aspect of this application provides a double-insertion immersed tube joint for immersed tunnels, comprising:

[0007] Guiding section;

[0008] A socket segment, disposed opposite to the guide segment; and,

[0009] A movable segment, located within the guide segment and capable of being extended to engage with the socket segment; wherein the guide segment and the socket segment are respectively socketed to both ends of the movable segment.

[0010] In one embodiment, the inner diameter of the guide section is larger than the outer diameter of the moving section, and the inner diameter of the socket section is larger than the outer diameter of the moving section; a first gap with a width is formed between the guide section and the moving section, and a second gap with a width is formed between the socket section and the moving section.

[0011] In one embodiment, the guide section has a first adjacent section and the connecting section has a second adjacent section; the first adjacent section is a buried tunnel section or a immersed tube segment, and the second adjacent section is an immersed tube segment.

[0012] In one embodiment, the guide section and the first adjacent section are integrally formed, and a first end seal that can be sealed is provided between them; the sleeve section and the second adjacent section are integrally formed, and a second end seal that can be sealed is provided between them.

[0013] In one embodiment, the guide section and the socket section are collectively referred to as the fixing part. The fixing part has a first support member located at the bottom of the fixing part to support the moving section. The guide section has a second support member located on the side wall of the guide section to limit the moving section. Since the socket section may not have a second support member, but instead relies on the second support member in the guide section for limiting, the second gap can be larger than the first gap.

[0014] In one embodiment, the double-insertion immersed tube joint for immersed tunnels further includes an annular sealing device that forms a seal between the fixed part and the moving part.

[0015] In one embodiment, the sealing device includes an annular pressure capsule located on the fixed portion, the pressure capsule having a cavity into which a pressure medium can be filled to expand and form a sealing layer between the fixed portion and the moving section; the pressure capsule is provided with a fixing strap that can connect it to the fixed portion.

[0016] In one embodiment, the pressure capsule is located in the space enclosed by the fixing strap and the fixing part.

[0017] In one embodiment, at least a portion of the fixing strap is elastic.

[0018] In one embodiment, after the sealing layer is formed between the fixed part and the movable part, the movable part can move relative to the fixed part.

[0019] In one embodiment, the fixing straps are mounted on the fixing part from both sides of the pressure capsule; the fixing straps provide tension along the moving direction of the moving segment.

[0020] In one embodiment, the pressure capsule and the fixing strap can be an integrally formed structure.

[0021] In one embodiment, a wear-resistant portion is provided between the pressure capsule and the moving section.

[0022] In one embodiment, the wear-resistant part and the fixing belt can be an integral structure; the thickness of the wear-resistant part is 0.1-10mm.

[0023] The second aspect of this application provides a construction method for a double-insertion immersed tube joint for immersed tunnels, comprising:

[0024] Prefabricate the guide section, socket section, and moving section separately; then place the socket section into position.

[0025] The moving section is slidably pushed into the guide section; the sealing device is set between the guide section and the moving section, and the guide section is submerged so that the guide section and the sleeve section are positioned opposite each other;

[0026] The moving section is pushed out of the guide section and gradually moves into the socket section; a sealing device is also provided between the socket section and the moving section.

[0027] After the moving section is roughly in place, pressure medium is injected into the cavities of each sealing device to make it full and expand, so that the sealing device can slide and fit tightly against the outer surface of the moving section, so that a sealing layer is formed between the moving section and the guide section and the sleeve section respectively; thereby forming a closed space in the guide section, the sleeve section and the moving section.

[0028] By removing water from the confined space to create dry construction conditions, the connection of the immersed tunnel and the construction within the confined space can be completed. During construction, the position of the moving section can be adjusted, and the sealing device achieves a sliding contact seal during the adjustment process.

[0029] As a more specific implementation, the construction method for the double-insertion immersed tube joint for immersed tunnels includes:

[0030] Prefabricate guide sections with first adjacent segments, with a first end seal between them; prefabricate socket sections with second adjacent segments, with a second end seal between them; and prefabricate a movable section; close the first and second end seals; and sink the socket section into place.

[0031] The moving section is slidably pushed into the guide section; the sealing device is set between the guide section and the moving section, and the guide section is submerged so that the guide section and the sleeve section are positioned opposite each other;

[0032] A jacking device is provided between the moving section and the guide section to push the moving section; the jacking device is used to push the moving section out of the guide section, so that it gradually moves into the socket section; a sealing device is also provided between the socket section and the moving section.

[0033] After the moving section is roughly in place, pressure medium is injected into the cavities of each sealing device to make it full and expand, so that the sealing device can slide and fit tightly against the outer surface of the moving section, so that a sealing layer is formed between the moving section and the guide section and the sleeve section respectively; thereby forming a closed space in the guide section, the sleeve section and the moving section.

[0034] Remove water from the enclosed space to create dry construction conditions; remove the first and second end seals; complete the connection of the immersed tunnel and construction within the enclosed space; during construction, the position of the moving section can be adjusted, and the sealing device achieves a sliding contact seal during the adjustment process.

[0035] Compared with the prior art, the beneficial effects of this application are as follows:

[0036] The immersed tunnel joint provided in at least one embodiment of this application adopts a structure in which the protruding end of the moving section is inserted into the sleeve section. It uses a pressure sealing device between the outer wall of the moving section and the inner wall of the sleeve section to seal the water, replacing the conventional method of using hydraulic pressure to press rubber material between the end faces to seal the final joint of the immersed tunnel. Because a larger gap can be left between the outer wall of the moving section and the inner wall of the sleeve section, it can accommodate larger misalignment errors and larger errors in the axial angle between the ends. Furthermore, because the moving section can move along the tunnel axis, it can also accommodate larger errors in the joint width caused by larger or smaller distances between the ends. In summary, the immersed tunnel joint of this application can accommodate larger prefabricated pipe section dimensions and errors in the immersed installation position, thus facilitating construction.

[0037] The immersed tube joint provided in at least one embodiment of this application has a sealing device that can achieve watertightness while maintaining sliding contact with the surface of the moving section; its structure is simple and construction is convenient.

[0038] The immersed tube joint provided in at least one embodiment of this application features a sealing device whose pressure capsule cross-section changes with variations in the external space. This allows the pressure capsule to adapt well to changes in the size and shape of the gap it seals, consistently achieving a good sealing and waterproofing effect. Furthermore, due to the fixing straps pulling and securing it from both sides, the sealing device and the contact area with the outer wall of the moving section can slide relative to each other while remaining in close contact. This prevents surface distortion and wrinkling caused by slippage and friction, thus accommodating changes and adjustments in the position of the moving section during subsequent permanent sealing structure construction. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a submerged pipe joint in the prior art;

[0040] Figure 2 This is a schematic diagram of a double-insertion immersed tube joint for an immersed tunnel, one embodiment of which is shown.

[0041] Figure 3 yes Figure 2 Longitudinal section view;

[0042] Figure 4 yes Figure 3 A magnified view of a portion of the image;

[0043] Figure 5 yes Figure 4 Top view;

[0044] Figure 6 This is a schematic diagram of a support member according to one implementation method;

[0045] Figure 7 This is a schematic diagram of the misalignment error at the docking end in one implementation method;

[0046] Figure 8 This is a schematic diagram illustrating the axial deflection error of one implementation method;

[0047] Figure 9 This is a schematic diagram of a sealing device according to one embodiment;

[0048] Figure 10 This is a schematic diagram of a sealing device according to one embodiment;

[0049] Numbered in the diagram: 1 guide section, 2 socket section, 3 moving section, 4 first adjacent section, 5 second adjacent section, 6 first end seal, 7 second end seal, 8 first support member, 9 second support member, 10 sealing device, 101 pressure capsule, 102 bladder, 103 fixing belt, 104 wear-resistant part, 11 sealed space, 12 jacking device. Detailed Implementation

[0050] The technical solutions of this application are described in detail below with reference to specific embodiments. However, it should be understood that, without further description, the elements, structures and features in one embodiment can also be beneficially incorporated into other embodiments.

[0051] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0052] In the description of this application, it should be understood that the terms "upper," "lower," "bottom," "inner," etc., indicate the orientation or positional relationship based on the appendix. Figure 3The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] like Figure 2-6 As shown, the first embodiment of this application provides a double-insertion immersed tunnel joint (hereinafter referred to as a double-insertion immersed tunnel joint), which has a guide section 1 and a sleeve section 2 arranged opposite to each other, and a movable section 3 located in the guide section 1 and capable of being pushed out to engage with the sleeve section 2. The inner diameter of both the guide section 1 and the sleeve section 2 is larger than the outer diameter of the movable section 3, that is, the guide section 1 and the sleeve section 2 are both enlarged sections relative to the movable section 3, so that both ends of the movable section 3 can be respectively sleeved in the guide section 1 and the sleeve section 2. By setting the guide section 1 and the sleeve section 2 respectively located at both ends of the movable section 3 and engaging with it, a double-insertion immersed tunnel joint can be realized. It is worth understanding that in this embodiment, the guide section 1, the sleeve section 2, and the movable section 3 are all hollow structures to form an immersed tunnel channel within them.

[0055] Due to the interlocking relationship between the moving section 3 and the socket section 2, a gap of a certain width can be formed between the outer wall of the moving section 3 and the inner wall of the socket section 2, allowing the double-insertion submerged pipe joint in this application to better adapt to situations with larger gaps. For example Figure 7 The diagram shows the misalignment error at the docking end. Specifically, the position of the moving segment 3 within the socket segment 2 is significantly biased to the right, indicating a large misalignment error. Figure 8 The diagram illustrates the axial deviation error, where the axis of the moving section 3 and the axis of the connecting section 2 exhibit a significant angle, indicating a substantial axial deviation error. When encountering these two overlapping or similar situations, existing immersed tube joints often fail to meet construction requirements. However, the double-insertion immersed tube joint in this application, due to the interlocking relationship between the connecting section 2 and the moving section 3, allows for greater deviations, better accommodating larger prefabricated pipe section dimensions and immersion installation position errors, thus facilitating construction.

[0056] In one embodiment, the guide section 1 has a first adjacent section 4, which can be, for example, the buried tunnel section described in CN215165824U; the connecting section 2 has a second adjacent section 5, which can be a immersed tube segment. With this arrangement, the tunnel composed of immersed tube segments can be laid starting from one end, while the buried tunnel section is constructed at the other end; when the immersed tube segment approaches the buried tunnel section, the double-insertion immersed tube joint is used to connect the immersed tube segment and the buried tunnel section. In another embodiment, both the first adjacent section 4 and the second adjacent section 5 are immersed tube segments. With this arrangement, tunnels composed of immersed tube segments can be laid from both ends separately; when the tunnels at both ends meet, the double-insertion immersed tube joint is used to connect the immersed tube segments at both ends. Since construction can be carried out simultaneously from both sides, construction efficiency can be improved.

[0057] The guide section 1 and the first adjacent section 4 can be integrally prefabricated, with a first end seal 6 that can be sealed between them to prevent water in the guide section 1 from entering the first adjacent section 4. The socket section 2 and the second adjacent section 5 can also be integrally prefabricated, with a second end seal 7 that can be sealed between them to prevent water in the socket section 2 from entering the second adjacent section 5.

[0058] Conversely, the guide section 1 and the socket section 2 are fixed parts, and the moving section 3 is a moving part. Therefore, when referring to the fixed part below, it can be understood as referring to both the guide section 1 and the socket section 2, or at least one of them.

[0059] In one implementation, such as Figure 4-6 As shown, the fixing part is provided with a first support member 8 located at the bottom of the fixing part; that is, the bottom of the guide section 1 and the sleeve section 2 can be respectively provided with the first support member 8. The first support member 8 can be a pier, which can support the moving section 3, allowing the moving section 3 to slide against its surface, maintaining the gap between the moving section 3 and the fixing part to reserve space for the subsequent sealing device, and preventing the moving section 3 from generating excessive friction on the guide section 1 and the sleeve section 2 during the movement, causing wear.

[0060] In one implementation, such as Figure 4 and Figure 6 As shown, the guide section 1 is provided with a second support member 9 located on the side wall of the guide section. The second support member 9 can be a support beam, respectively set on two opposite side walls of the guide section 1; it can restrict the moving section 3 from both sides, thereby limiting the left and right movement of the moving section 3 and preventing excessive displacement of the moving section 3 during movement. The socket section 2 here does not need to be provided with a second support member; the second support member in the guide section 1 alone is used to restrict the left and right movement of the moving section 3, thus allowing the socket section 2 to accommodate a larger left and right deviation of the moving section 3.

[0061] In one embodiment, the double-insertion submerged pipe joint further includes a sealing device 10, which is annular and can form a seal between the fixed part and the moving section 3 to prevent external water from further entering the guide section 1, the sleeve section 2 and the moving section 3.

[0062] like Figure 3-5 , Figure 9 and Figure 10 As shown, the sealing device 10 includes an annular pressure capsule 101 disposed on the fixed part (guide section 1 and sleeve section 2), which has a cavity 102 and can be filled with a pressure medium to expand, thereby forming a sealing layer between the fixed part and the moving section 3. The pressure capsule 101 is provided with a fixing strap 103 for mounting it on the fixed part.

[0063] The movable segment 3 can slide relative to the fixed part, and the expanded pressure capsule 101 can make a tight contact between the two to form the sealing layer, dividing the space between the fixed part and the movable segment 3 into two.

[0064] In one implementation, such as Figure 9 and Figure 10 As shown, the mounting points of the fixing strap 103 on the fixing part are distributed on both sides of the pressure capsule 101, and the pressure capsule 101 is mounted on the fixing part from both sides; the pressure capsule 101 is constrained within the space enclosed by the fixing strap 103, thereby fixing it to the surface of the fixing part. The fixing strap 103 provides tension along the moving direction of the moving section 3. In addition, the two ends of the fixing strap 103 can be sealed to the fixing part to further form an additional sealing layer outside the cavity 102 of the pressure capsule 101; of course, it can also be unsealed, as long as the part sandwiched between the pressure capsule 101 and the moving section 3 is made of a tightly sealed, waterproof material, it can be connected to the sealing layer formed by the pressure capsule 101, forming a continuous sealing layer between the fixing part and the moving section 3.

[0065] In this embodiment, even after the pressure capsule 101 expands, due to the pulling and protective effect of the fixing band 103, when the moving section 3 moves, the pressure capsule 101 cannot translate or twist, and is not easily clamped or wrinkled (it is also not easily clamped or wrinkled when a sealing layer is not formed), thus ensuring sealing performance. At the same time, because the sealing device 10 is fixed and protected by the fixing band 103, it is not easily twisted or deformed, allowing the entire sealing device to independently perform the sealing function; thus, it does not need to work with a conventional waterstop, and the conventional waterstop (e.g., Figure 1 The 8' type of expansion joint waterstop is easier to construct.

[0066] In one implementation, such as Figure 10 As shown, the pressure capsule 101 and the fixing strap 103 can be an integrally formed structure, with the pressure capsule 101 enclosed by the fixing strap 103. A portion of the fixing strap 103 can serve as the capsule wall of the pressure capsule 101. The pressure capsule 101 and the fixing strap 103 can be made of a flexible, waterproof material, such as elastic rubber. The fixing strap 103 is elastic or maintains a pre-set slack, allowing it to adaptably deform as the pressure capsule 101 expands, thereby securing the pressure capsule 101.

[0067] Before the pressure capsule 101 expands, the fixing belt 103 is kept in a loose state, so as to leave room for the pressure capsule 101 to expand. The pressure capsule 101 is filled and pressurized to make it fully expand, thereby pressing the pressure capsule 101 and the wear-resistant part 104 onto the moving section 3, so that the outer surface of the sealing device 10 can be slidably and tightly attached to the moving section 3.

[0068] The pressure capsule 101 and fixing band 103 of the sealing device 10 can both be elongated strips and joined at both ends to form an annulus. The annular sealing device 10 is installed on the inner surface of the fixed part and can contact the outer surface of the moving section 3 after expansion, achieving a slidable and tight fit. Even after a sealing layer has been formed between the fixed part and the moving section 3, the moving section 3 can still be adaptively adjusted relative to the fixed part during subsequent dry construction, achieving left and right sliding.

[0069] In one embodiment, a wear-resistant part 104 is provided between the pressure capsule 101 and the moving section 3; the thickness of the wear-resistant part 104 is 0.05-20mm, preferably 0.1-10mm; the wear-resistant part 104 can be made of natural rubber, various synthetic rubbers, or other polymer materials that meet the wear resistance requirements, so as to reduce or minimize the wear of the pressure capsule 101 by the moving section 3 during the sliding process.

[0070] Optionally, the wear-resistant part 104 can be integrally formed with the fixing belt 103, that is, the portion of the fixing belt 103 located between the pressure capsule 101 and the moving section 3 serves as the wear-resistant part 104. This arrangement facilitates manufacturing, processing, and installation, allowing a single fixing belt 103 to perform two functions simultaneously. When the pressure capsule 101 and the fixing belt 103 are integrally formed, a portion of the wear-resistant part 104 can also serve as the capsule wall of the pressure capsule 101.

[0071] The second embodiment of this application provides a construction method for a double-insertion immersed tube joint for immersed tunnels. Any of the double-insertion immersed tube joints for immersed tunnels described in the preceding embodiments can be selected. (See reference...) Figure 2-5 The construction method includes the following steps:

[0072] S1: Prefabricate guide section 1, socket section 2 and moving section 3 respectively; place socket section 2 into position;

[0073] S2: Slide the moving section 3 into the guide section 1; the sealing device 10 is set between the guide section 1 and the moving section 3; sink the guide section 1 so that the guide section 1 and the sleeve section 2 are positioned opposite each other.

[0074] S3: Push the moving section 3 out of the guide section 1 and gradually move it into the socket section 2; a sealing device 10 is also provided between the socket section 2 and the moving section 3;

[0075] S4: After the moving section 3 is roughly in place, a pressure medium is injected into the cavity 102 of each sealing device 10 to make it full and expand, so that the sealing device 10 can be slidably and tightly attached to the outer surface of the moving section 3, so that the moving section 3 forms a sealing layer between the guide section 1 and the sleeve section 2 respectively; thereby forming a closed space 11 in the guide section 1, the sleeve section 2 and the moving section 3.

[0076] S5: Remove water from the enclosed space 11 to create dry construction conditions, complete the connection of the immersed tunnel and the construction within the enclosed space 11; during the construction process, the position of the moving section 3 can be adjusted, and the sealing device 10 achieves a sliding contact during the adjustment process.

[0077] More specifically, in S1, a guide section 1 with a first adjacent section 4 is prefabricated, with a first end seal 6 between them, and a connecting section 2 with a second adjacent section 5 is prefabricated, with a second end seal 7 between them; the first end seal 6 and the second end seal 7 are sealed. After the water in the sealed space 11 is drained in S5, the first end seal 6 and the second end seal 7 can be removed.

[0078] In S3, a jacking device 12 (e.g., a jack) is provided between the moving section 3 and the guiding section 1 to push the moving section 3. Figure 4 and Figure 5 As shown, where Figure 5 for Figure 4 The view from above.

[0079] The above-described steps do not impose an absolute limitation on the sealing construction steps. The order can be adjusted according to the actual construction. Therefore, the described order should not be construed as an absolute limitation on this application.

[0080] The described embodiments are merely preferred embodiments of this application and are not intended to limit the scope of this application. Any modifications and improvements made by those skilled in the art to the technical solutions of this application without departing from the spirit of this application should fall within the protection scope defined by the claims of this application.

Claims

1. A double-insertion type immersed tube joint for immersed tunnels, characterized in that, include: Guiding section; A socket segment is disposed opposite to the guide segment; A movable segment, located within the guide segment and extendable to engage with the socket segment; wherein the guide segment and the socket segment are respectively socketed to both ends of the movable segment; and Annular sealing device; The guide section has a first adjacent section, which is a buried tunnel section or an immersed tube segment; the connecting section has a second adjacent section, which is an immersed tube segment; a first end sealing door capable of being sealed is provided between the guide section and the first adjacent section; a second end sealing door capable of being sealed is provided between the connecting section and the second adjacent section. The guide section and the sleeve section are collectively referred to as the fixing section; the sealing device includes an annular pressure capsule located on the fixing section; the pressure capsule has a cavity in which a pressure medium can be filled to expand, forming a sealing layer between the fixing section and the moving section respectively.

2. The double-insertion immersed tube joint for immersed tunnels according to claim 1, characterized in that, The inner diameter of both the guide section and the inner diameter of the socket section are larger than the outer diameter of the moving section.

3. The double-insertion immersed tube joint for immersed tunnels according to claim 1, characterized in that, The fixed part is provided with a first support member located at the bottom of the fixed part to support the moving section; and the guide section is provided with a second support member located on the side wall of the guide section to limit the moving section.

4. The double-insertion immersed tube joint for immersed tunnels according to claim 1, characterized in that, The pressure capsule is provided with a fixing strap that can be used to connect it to the fixing part.

5. The double-insertion immersed tube joint for immersed tunnels according to claim 4, characterized in that, The fixing straps are installed on the fixing part from both sides of the pressure capsule; the fixing straps provide tension along the moving direction of the moving section.

6. The double-insertion immersed tube joint for immersed tunnels according to claim 5, characterized in that, The pressure capsule is located in the space between the fixing belt and the fixing part; at least a portion of the fixing belt is elastic.

7. The double-insertion immersed tube joint for immersed tunnels according to any one of claims 1-6, characterized in that, After the sealing layer is formed between the fixed part and the moving part, the moving part can move relative to the fixed part.

8. The double-insertion immersed tube joint for immersed tunnels according to any one of claims 4-6, characterized in that, A wear-resistant part is provided between the pressure capsule and the moving section; the wear-resistant part and the fixing belt are an integral structure; the thickness of the wear-resistant part is 0.1-10mm.

9. A construction method for a double-insertion immersed tube joint for immersed tunnels, employing the double-insertion immersed tube joint as described in any one of claims 1-8, the construction method comprising: The guide section, the connecting section, and the moving section are prefabricated separately. Sink the socket section into place; The moving section is slidably pushed into the guide section; the sealing device is set between the guide section and the moving section, and the guide section is submerged so that the guide section and the sleeve section are positioned opposite each other; The moving section is pushed out of the guide section and gradually moves into the socket section; a sealing device is also provided between the socket section and the moving section. After the moving section is in place, a pressure medium is injected into the cavities of each sealing device to make it expand, so that the sealing device can slide and fit tightly against the outer surface of the moving section, so that a sealing layer is formed between the moving section and the guide section and the sleeve section respectively; thereby forming a closed space in the guide section, the sleeve section and the moving section. The water in the confined space is removed to create dry construction conditions; the connection of the immersed tunnel and the construction in the confined space are completed; during the construction process, the position of the moving section can be adjusted, and the sealing device achieves a sliding contact seal during the adjustment process.

10. The construction method for the double-insertion immersed tube joint for immersed tunnels according to claim 9, more specifically, includes: A guide section with a first adjacent section is prefabricated, with a first end sealing door between them; a socket section with a second adjacent section is prefabricated, with a second end sealing door between them; and a moving section is prefabricated; the first end sealing door and the second end sealing door are closed; and the socket section is lowered into place. The moving section is slidably pushed into the guide section; the sealing device is set between the guide section and the moving section, and the guide section is submerged so that the guide section and the sleeve section are positioned opposite each other; A jacking device is provided between the moving section and the guide section to push the moving section; the jacking device is used to push the moving section out of the guide section, so that it gradually moves into the socket section; a sealing device is also provided between the socket section and the moving section. After the moving section is in place, a pressure medium is injected into the cavities of each sealing device to make it expand, so that the sealing device can slide and fit tightly against the outer surface of the moving section, so that a sealing layer is formed between the moving section and the guide section and the sleeve section respectively; thereby forming a closed space in the guide section, the sleeve section and the moving section. Remove water from the enclosed space to create dry construction conditions; remove the first and second end seals; complete the connection of the immersed tunnel and construction within the enclosed space; during construction, the position of the moving section can be adjusted, and the sealing device achieves a sliding contact seal during the adjustment process.

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