Cable penetration device for sealing door at the end of immersed tube

Abstract

The present invention relates to a cable cabin penetration device for sealing doors at the end of an immersed tube, belonging to the technical field of immersed tube tunnel construction; it comprises an external load-bearing system, the external load-bearing system comprises a sealing body with a cavity structure, one side of the sealing body is provided with a fixed block for increasing the radial clamping force between the device and the cable, and a screw sleeve sleeved on the fixed block for locking the fixed block; an internal waterproof system is provided in the cavity on the other side of the sealing body, the internal waterproof system comprises a first sealing shell and a second sealing shell whose shapes are both wedge-shaped when matched with each other; an internal load-bearing system is also provided in the middle of the cavity of the sealing body, the internal load-bearing system comprises a locking nut and a pressure rod pressed on the outer periphery of the locking nut; one side of the external load-bearing system is connected with a bending limiter for external waterproofing and filled with resin. By providing two layers of waterproof systems and two layers of load-bearing systems, it is possible to solve the problem that the existing cabin penetration installation device is not suitable for deeper seawater.

Description

Technical Field

[0001] The invention relates to the technical field of immersed tube tunnel construction, and in particular to an immersed tube end sealing door cable cabin penetration device. Background Art

[0002] Immersed tube tunnel construction has a history of 100 years in Europe, but it is still in its infancy in China. The immersed tube method is to set steel detachable sealing doors at both ends of the tube segment. After the sealing doors are installed, the tube segment becomes a sealed box. The prefabricated box weighs tens of thousands of tons or even more, and is equipped with ballast water tanks, ballast pumps and lighting equipment. The cable provides power and communication functions for the internal box. The safe and reliable passage of the cable through the sealing door into the immersed tube is one of the key technologies that determine the stability of the immersed tube installation. The existing through-cabin installation device adopts packing sealing technology, specifically filling soft material between the cable and the clamping ring, increasing the volume of the soft material through the clamping ring, and increasing the surface area between the cable and the clamping ring to achieve sealing. This sealing form cannot adapt to complex offshore water environments or deeper seawater. Summary of the invention

[0003] In view of the technical problem that the existing cable penetration device cannot adapt to deeper seawater, the present invention provides a cable penetration device with a sealed door at the end of an immersed tube. The device adopts a double-layer load-bearing and double-layer sealing structure to solve the problem that the existing penetration installation device is not suitable for deeper seawater.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The cable passage device for sealing the door at the end of an immersed tube comprises an external load-bearing system, which comprises a sealing body with a cavity structure, one side of the sealing body is provided with a fixed block for increasing the radial clamping force of the cable and a screw sleeve for locking the fixed block which is sleeved on the fixed block; an internal waterproof system is arranged in the cavity on the other side of the sealing body, the internal waterproof system comprises a first sealing shell and a second sealing shell which are wedge-shaped and cooperate with each other; an internal load-bearing system is also arranged in the middle of the cavity of the sealing body, the internal load-bearing system comprises a locking nut and a pressure rod pressed on the outer periphery of the locking nut; one side of the external load-bearing system is connected with a bending limiter which is used for external waterproofing and is filled with resin inside.

[0006] As an optimization, a flange is provided on one side of the first sealing shell, and a groove is provided on one side of the second sealing shell, and the length of the flange is smaller than the length of the groove.

[0007] As an optimization, there is a gap between the first sealing shell, the second sealing shell and the inner wall of the sealing body.

[0008] As an optimization, a rectangular groove for increasing the pressing force between the fixing block and the cable is provided on the surface of the fixing block, and one end of the fixing block inserted into the screw sleeve is a cone.

[0009] As an optimization, the pressure rod is provided with a spiral line that matches the thread of the locking nut.

[0010] As an optimization, the number of the fixing blocks is set to an odd number greater than 3, and is evenly distributed around the axis of the sealing body.

[0011] As an optimization, it also includes a first limiting structure for preventing the internal waterproof system from moving in the radial direction, and the first limiting structure is located at one side end of the internal waterproof system.

[0012] As an optimization, a second limiting structure in the shape of a sleeve is provided between the internal waterproof system and the inner wall of the sealing body for preventing the internal waterproof system from moving in the axial direction.

[0013] As an optimization, a stop washer is connected to the outer peripheral wall of the locking nut to prevent the locking nut from generating radial displacement.

[0014] As an optimization, a handle is further included, and the handle is arranged above the sealing body.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are:

[0016] The cable cabin penetration device for sealing the door at the end of the immersed tube of the present invention adopts two layers of sealing, namely, an external sealing system and an internal resin-filled bend limiter, and two layers of load-bearing, namely, an external load-bearing system and an internal load-bearing system. The sealing and the load-bearing are arranged at intervals to assist each other, and the structure is compact and the operation is simple. The problem of the cable cabin penetration for sealing the door at the end of the immersed tube being affected by deep-sea forces during construction is solved, and the safety of the cable is also protected. The device is suitable for operations in harsh offshore water environments and has good corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0018] Figure 2 For the present invention Figure 1 AA view in the figure;

[0019] Figure 3 This is a schematic diagram of the structure of the first sealed shell according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the second sealed shell according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of a fixed block according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the compression rod structure of an embodiment of the present invention;

[0023] In the above figures: 1-sealing body, 2-cable, 3-fixing block, 31 rectangular groove, 32-conical body, 4-screw sleeve, 5-first sealing shell, 51-flange, 6-second sealing shell, 61-groove, 7-locking nut, 8-pressure rod, 81-spiral wire, 9-resin, 10-bending limiter, 11-first limiting structure, 12-second limiting structure, 13-stop washer, 14 handle. DETAILED DESCRIPTION

[0024] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “inside”, “outside”, “upper”, “lower”, “front” and “back” are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] like Figure 1-6 The invention shows that the cable passage device for sealing the end of an immersed tube comprises an external load-bearing system, which is the main load-bearing component of the device and is mainly composed of a sealing body 1, a fixing block 3 and a screw sleeve 4, and comprises a sealing body 1 with a cavity structure, and a fixing block 3 for increasing the radial clamping force between the device and the cable 2 and a screw sleeve 4 sleeved on the fixing block 3 are arranged on one side of the sealing body 1; an internal waterproof system is arranged in the cavity on the other side of the sealing body 1, and the internal waterproof system comprises a first sealing shell 5 and a second sealing shell 6 which are wedge-shaped and cooperate with each other, and waterproof material is filled between the first sealing shell 5 and the second sealing shell 6 and the sealing body 1; an internal load-bearing system is also arranged in the middle of the cavity of the sealing body, and the internal load-bearing system mainly bears the weight of the cable, and the internal load-bearing system comprises a locking nut 7 and a pressure rod 8 pressed on the outer periphery of the locking nut 7; a bending limiter 10 with an internal filling resin 9 for external waterproofing is connected to one side of the external load-bearing system.

[0027] Specifically, in order to further improve the sealing performance, in one embodiment of the present scheme, the first sealing shell 5 has a wedge-shaped structure and is provided with a flange 51 on one side, and the second sealing shell 6 has a wedge-shaped structure and is provided with a groove 61 on one side, and the length of the flange 51 is smaller than the length of the groove 61; when the first sealing shell 5 and the second sealing shell 6 are assembled, the flange 51 of the first sealing shell 5 can be precisely matched with the groove 61 of the second sealing shell 6. After the two are matched, due to the different lengths of the flange 51 and the groove 61, the first sealing shell 5 moves toward the direction of the second sealing shell 6, thereby increasing the pressing force of the waterproof material in the internal sealing body 1.

[0028] Specifically, in order to further increase the clamping force between the device and the cable 2, in one embodiment of the present scheme, a rectangular groove 31 is provided on the surface of the fixing block 3 for increasing the clamping force between the fixing block 3 and the cable 2, and the rectangular grooves 31 are evenly distributed on the surface of the fixing block 3, and one end of the fixing block 3 inserted into the screw sleeve 4 is a cone 32, and the cone 32 can prevent the fixing block 3 from radially rotating in the sealing body 1, so as to offset the torsional load of the cable 2.

[0029] Specifically, the number of the fixing blocks 3 is set to an odd number greater than 3. The fixing blocks 3 are set to an odd number for better clamping effect, and the cable 2 is not easy to twist and slide, and are evenly distributed around the axis of the sealing body 1.

[0030] Specifically, in order to further improve the load-bearing capacity, in an embodiment of the present scheme, a spiral wire 81 matching with the thread of the locking nut 7 is provided on the pressure rod 8, and the outer ring of the locking nut 7 has its own spiral wire. The spiral wire 81 of the pressure rod 8 cooperates with the spiral wire of the locking nut 7 so that the two are clamped and will not move left and right. A certain gap is left between the pressure rod 8 and the cable 2, which can bear the weight of the cable 2 well.

[0031] Specifically, in order to prevent the radial displacement of the internal waterproof system, a first limiting structure 11 for preventing the internal waterproof system from moving radially is also included. The first limiting structure 11 is a gasket, and the first limiting structure 11 is located at one side end of the internal waterproof system.

[0032] Specifically, in order to prevent the internal waterproof system from moving axially, a second limiting structure 12 for preventing the internal waterproof system from moving axially is provided between the internal waterproof system and the inner wall of the sealing body 1 , and the second limiting structure 12 is a sleeve.

[0033] Specifically, a stop washer 13 is connected to the outer peripheral arm of the locking nut 7 to prevent the locking nut 7 from generating radial displacement.

[0034] Specifically, it also includes a handle 14 , which is disposed above the sealing body 1 . The sealing body 1 is driven to switch by turning on and off the handle 14 to loosen or clamp the cable 2 .

[0035] During operation: first, insert the cable 2 into the interior of the sealing body, insert the fixing block 3 into the cavity at the rear end of the sealing body 1, and then use a torque tool to clamp the screw sleeve 4 on the fixing block 3 so that the maximum contact surface and the maximum radial compression force of the fixing block 3 are connected to the outer sheath of the cable 2, and the first sealing shell 5 and the second sealing shell 6 are pushed tightly, and the first sealing shell 5 and the second sealing shell 6 are at a certain angle to the plane where the inner wall of the sealing body 1 is located, and then install the first limiting structure 11, and then inject waterproof material into the cavity of the sealing body 1 to achieve the internal waterproof function. The external waterproof function is achieved by setting a bend limiter 10 at one end of the sealing body, and the bend limiter 10 is filled with waterproof resin 9. The load-bearing system includes an external load-bearing system and an internal load-bearing system. The sealing body 1, the fixing block 3 and the screw sleeve 4 constitute the external load-bearing system, and the locking nut 7 and the pressure rod 8 constitute the internal load-bearing system. The device adopts two layers of sealing and two layers of load-bearing, and the sealing and load-bearing are arranged at intervals to play a role of mutual assistance.

[0036] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. The cable penetration device for sealing the door at the end of the immersed tube is characterized by: The invention comprises an external load-bearing system, the external load-bearing system comprising a sealing body (1) with a cavity structure, a fixing block (3) for increasing the radial clamping force of a cable (2) and a screw sleeve (4) sleeved on the fixing block (3) for locking the fixing block (3) are arranged on one side of the sealing body (1); an internal waterproof system is arranged in the cavity on the other side of the sealing body (1), the internal waterproof system comprises a first sealing shell (5) and a second sealing shell (6) which are mutually matched and both have a wedge-shaped structure; an internal load-bearing system is also arranged in the middle of the cavity of the sealing body (1), the internal load-bearing system comprises a locking nut (7) and a pressure rod (8) pressed on the outer periphery of the locking nut (7); a bending limiter (10) for external waterproofing and filled with resin (9) is connected to one side of the external load-bearing system.

2. The immersed tube end sealing cable cabin penetration device according to claim 1, characterized in that: A flange (51) is provided on one side of the first sealing shell (5), and a groove (61) is provided on one side of the second sealing shell (6), wherein the length of the flange (51) is smaller than the length of the groove (61).

3. The immersed tube end sealing cable cabin penetration device according to claim 1, characterized in that: There is a gap between the first sealing shell (5) and the second sealing shell (6) and the inner wall of the sealing body (1).

4. The immersed tube end sealing cable cabin penetration device according to claim 1, characterized in that: A rectangular groove (31) for increasing the pressing force between the fixing block (3) and the cable (2) is provided on the surface of the fixing block (3), and one end of the fixing block (3) inserted into the screw sleeve (4) is a cone (32).

5. The immersed tube end sealing cable cabin penetration device according to claim 1, characterized in that: The pressure rod (8) is provided with a helical thread (81) that matches the thread of the locking nut (7).

6. The immersed tube end sealing cable cabin penetration device according to claim 4, characterized in that: The number of the fixing blocks (3) is set to an odd number greater than 3, and is evenly distributed around the axis of the sealing body (1).

7. The immersed tube end sealing cable cabin penetration device according to claim 1, characterized in that: It also comprises a first limiting structure (11) for preventing the internal waterproof system from moving in the radial direction, wherein the first limiting structure (11) is located at one side end of the internal waterproof system.

8. The immersed tube end sealing cable cabin penetration device according to claim 1, characterized in that: A second limiting structure (12) in the shape of a sleeve is provided between the internal waterproof system and the inner wall of the sealing body (1) for preventing the internal waterproof system from moving in the axial direction.

9. The immersed tube end sealing cable cabin penetration device according to claim 1, characterized in that: A stop washer (13) is connected to the outer peripheral wall of the locking nut (7) and is used to prevent the locking nut (7) from generating radial displacement.

10. The immersed tube end sealing cable cabin penetration device according to claim 1, characterized in that: It also comprises a handle (14), wherein the handle (14) is arranged above the sealing body (1).

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