A kind of impact-resistant sheath tube for flexible and reelable submarine cable

Abstract

The utility model discloses an impact-resistant sheath tube for a flexible and coilable submarine cable, comprising an anti-external pressure armor skeleton layer, a tensile armor layer, an impact-resistant layer and a wear-resistant layer; the anti-external pressure armor skeleton layer is an S-shaped self-locking structure formed by pressing and winding a low-carbon steel material, and two layers of tensile armor layers are coaxially sleeved on its outer surface, thereby preventing the failure of the anti-external pressure armor skeleton layer due to excessive yielding during the dragging of the anchor through the tensile armor layer; an impact-resistant layer for resisting the impact of falling objects on the anchor is coaxially sleeved on the outer surface of the tensile armor layer, the impact-resistant layer adopts a 2-petal structure, is connected by adhesive or bolts, and is attached to the outer surface of the tensile armor layer by continuous conveying; a wear-resistant layer is coaxially sleeved on the outer surface of the impact-resistant layer. The utility model simplifies the structure, reduces the cost, can realize the external protection of the entire cable line, and can be constructed synchronously with the cable.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to an impact-resistant sheath tube for a flexible and coilable submarine cable. Background Art

[0002] Submarine cables are generally laid on the seabed for power transmission or signal transmission. Usually, offshore areas where submarine cables are laid are close to waterways and face external damage from ship moorings or fishing boat operations. Submarine cables can be displaced or broken by anchors, resulting in power and signal interruptions.

[0003] The traditional solution is to add multiple layers of armor outside the cable, but this method is still difficult to completely avoid the above problems, and adding multiple layers of armor will greatly increase the cost of the submarine cable. Another solution is to add protective devices to the outside of the cable in areas where damage is frequent, but the usual protective devices are short and heavy protective plates or sand, which generally do not have the ability to protect the entire line, and the construction of short protective plates is very difficult. Therefore, the development of a continuous length of flexible sheath device that can be constructed synchronously with the cable has become a problem that needs to be solved urgently. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an impact-resistant sheath tube for a flexible and coilable submarine cable, which simplifies the structure, reduces the cost, and has a long single length. The cable is inserted into the sheath tube, which can achieve external protection of the entire line of cables and can be constructed synchronously with the cables.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: the utility model is a flexible and coilable impact-resistant sheath tube for submarine cables, and its innovation lies in: comprising an anti-external pressure armor skeleton layer, a tensile armor layer, an impact-resistant layer and a wear-resistant layer; the anti-external pressure armor skeleton layer is an S-shaped self-locking structure formed by pressing and winding a low-carbon steel material, and two layers of tensile armor layers are coaxially sleeved on its outer surface, thereby preventing the failure of the anti-external pressure armor skeleton layer due to excessive yielding during the dragging of the anchor through the tensile armor layer; an impact-resistant layer for resisting the impact of falling objects on the anchor is coaxially sleeved on the outer surface of the tensile armor layer, and the impact-resistant layer adopts a 2-petal structure, and is connected by adhesive or bolts, and is adhered to the outer surface of the tensile armor layer by continuous conveying; a wear-resistant layer is coaxially sleeved on the outer surface of the impact-resistant layer.

[0006] Preferably, the S-shaped self-locking structure is first pressed from low-carbon steel material into a pre-wound profile, then bent into a spiral profile by internal and external compression, and finally the spiral profile is locked at the ends to form a continuous tubular body, and the S-shaped inner and outer walls interact with each other to form an interlocking shape that resists external pressure, and a gap is maintained to achieve a certain degree of bending.

[0007] Preferably, each layer of the tensile armor layer is a flat winding structure, that is, high modulus steel bars or high modulus fiber composite materials are spirally wound on the outer surface of the anti-external pressure armor skeleton layer in two layers, inner and outer, so as to maintain a small deformation and achieve resistance to anchor chain drag.

[0008] Preferably, the spiral winding angle of each layer of the tensile armor layer is 20°~40°.

[0009] Preferably, the two-petal structure of the impact-resistant layer is prefabricated with polyurethane foam material or concrete prefabricated material; when the tensile armor layer uses high modulus steel bars, the impact-resistant layer uses polyurethane foam material; when the tensile armor layer uses high modulus fiber composite materials, the impact-resistant layer needs to use concrete prefabricated material according to weight requirements, thereby increasing the weight.

[0010] Preferably, when a polyurethane foam material is selected, the hardness of the polyurethane foam material needs to be controlled within the range of 80A to 90A on the Shore A scale, and the two-petal structure of the polyurethane foam material is connected by adhesive or bolts to ensure that it has a certain degree of bending performance.

[0011] Preferably, when precast concrete materials are used, the two-petal structures of the precast concrete materials are connected by bolts, and the precast concrete petal structure is a short circular tube structure in which concrete is precast, and the ends are connected by steel wires, and the steel wires are coaxially attached to the outer surface of the tensile armor layer; the length of the steel wires is determined according to the bending radius of the sheath tube, so that the sheath tube can be coiled.

[0012] Preferably, the wear-resistant layer is made of nylon or polyurethane elastomer according to the underwater soil conditions, and is extruded onto the outer surface of the impact-resistant layer.

[0013] Beneficial effects of the utility model:

[0014] (1) The utility model simplifies the structure and reduces the cost. Moreover, the length of a single cable is relatively long. The cable is inserted into the sheath tube, which can realize the external protection of the entire line of cables and can be constructed synchronously with the cables.

[0015] (2) The utility model realizes resistance to anchor impact and dragging through a multi-layer structure, and it has a certain weight, which can ensure the stability of the cable on the seabed and realize long-life protection of the submarine cable;

[0016] (3) The sheath pipe of the utility model is flexible and can be transported in a coil, thereby improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 The utility model is a schematic structural diagram of an impact-resistant sheath tube for a flexible and coilable submarine cable.

[0019] Figure 2 for Figure 1 sectional view of .

[0020] Figure 3 This is a schematic diagram of the structure when the impact-resistant layer of the utility model is made of prefabricated concrete material.

[0021] Among them, 1-anti-external pressure armor skeleton layer; 2-tensile armor layer; 3-impact resistant layer; 4-wear-resistant layer. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be clearly and completely described below through specific implementation methods.

[0023] The utility model discloses a flexible and reelable impact-resistant sheath tube for submarine cables, comprising an external pressure-resistant armor skeleton layer 1, a tensile armor layer 2, an impact-resistant layer 3 and a wear-resistant layer 4; the specific structure is as follows Figure 1 , Figure 2 As shown, the anti-external pressure armor skeleton layer 1 is an S-shaped self-locking structure formed by pressing and winding low-carbon steel materials. Specifically, the low-carbon steel materials are first pressed into pre-wound profiles, and then bent into spiral profiles by internal and external compression. Finally, the spiral profiles are locked at the ends to form a continuous tubular body, and the S-shaped inner and outer walls interact with each other to form an interlocking anti-external pressure shape, and a gap is maintained to achieve a certain degree of bending. The S-shaped self-locking structure adopted by the utility model can not only prevent the external water pressure from crushing the sheath pipe, but also prevent the occurrence of local crushing caused by the failure of the lock buckle during the anchor dragging process.

[0024] The utility model also has two layers of tensile armor layers 2 coaxially sleeved on the outer surface of the anti-external pressure armor skeleton layer 1, thereby preventing the anti-external pressure armor skeleton layer 1 from failing due to excessive yielding during the anchor dragging process through the tensile armor layer 2; Figure 1 , Figure 2 As shown, each layer of tensile armor layer 2 is a flat winding structure, that is, high modulus steel bars or high modulus fiber composite materials are spirally wound on the outer surface of the external pressure resistant armor skeleton layer 1 in two layers, inner and outer, so as to maintain a small deformation and achieve resistance to anchor chain drag; wherein, the spiral winding angle of each layer of tensile armor layer 2 is 20°~40°.

[0025] The utility model also has an anti-impact layer 3 coaxially sleeved on the outer surface of the tensile armor layer 2 for resisting the impact of falling objects. The anti-impact layer 3 adopts a two-petal structure and is connected by adhesive or bolts and attached to the outer surface of the tensile armor layer 2 by continuous conveying; Figure 1 , Figure 2 As shown, the two-petal structure of the impact-resistant layer 3 is prefabricated with polyurethane foam material or concrete prefabricated material; when the tensile armor layer 2 uses high modulus steel bars, the impact-resistant layer 3 uses polyurethane foam material, the hardness of the polyurethane foam material needs to be controlled at Shore 80A~90A, and the two-petal structure of the polyurethane foam material is connected by adhesive or bolts to ensure that it has a certain degree of bending performance.

[0026] like Figure 1 , Figure 2 As shown, when the tensile armor layer 2 uses a high modulus fiber composite material, the impact-resistant layer 3 needs to use a precast concrete material according to the weight requirement, thereby increasing the weight; the two-petal structure of the precast concrete material is connected by bolts, and the precast concrete petal structure is a short circular tube structure in which the concrete is precast, and the ends are connected by steel wires, and the steel wires are coaxially attached to the outer surface of the tensile armor layer 2; the length of the steel wire is determined according to the bending radius of the sheath tube, so that the sheath tube can be coiled.

[0027] The utility model also has a wear-resistant layer 4 coaxially sleeved on the outer surface of the impact-resistant layer 3. Figure 1 , Figure 2 As shown, the wear-resistant layer 4 is made of nylon or polyurethane elastomer according to the underwater soil conditions, and is extruded on the outer surface of the impact-resistant layer 3.

[0028] Beneficial effects of the utility model:

[0029] (1) The utility model simplifies the structure and reduces the cost. Moreover, the length of a single cable is relatively long. The cable is inserted into the sheath tube, which can realize the external protection of the entire line of cables and can be constructed synchronously with the cables.

[0030] (2) The utility model realizes resistance to anchor impact and dragging through a multi-layer structure, and it has a certain weight, which can ensure the stability of the cable on the seabed and realize long-life protection of the submarine cable;

[0031] (3) The sheath pipe of the utility model is flexible and can be transported in a coil, thereby improving efficiency.

[0032] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.

Claims

1. A flexible and reelable impact-resistant sheath tube for submarine cables, characterized in that: It includes an anti-external pressure armor skeleton layer, a tensile armor layer, an impact-resistant layer and a wear-resistant layer; the anti-external pressure armor skeleton layer is an S-shaped self-locking structure formed by pressing and winding a low-carbon steel material, and two layers of tensile armor layers are coaxially sleeved on its outer surface, so as to prevent the failure of the anti-external pressure armor skeleton layer due to excessive yielding during the dragging of the anchor through the tensile armor layer; an impact-resistant layer for resisting the impact of falling objects on the anchor is coaxially sleeved on the outer surface of the tensile armor layer, and the impact-resistant layer adopts a 2-petal structure, is connected by adhesive or bolts, and is attached to the outer surface of the tensile armor layer by continuous conveying; a wear-resistant layer is coaxially sleeved on the outer surface of the impact-resistant layer.

2. The impact-resistant sheath tube for a flexible coilable submarine cable according to claim 1, characterized in that: The S-shaped self-locking structure is specifically made by first pressing low-carbon steel material into a pre-wound profile, then bending it into a spiral profile by internal and external compression, and finally locking the spiral profile at the ends to form a continuous tubular body. The S-shaped inner and outer walls interact with each other to form an interlocking shape that resists external pressure, and maintain a gap, thereby achieving a certain degree of bending.

3. The impact-resistant sheath tube for a flexible coilable submarine cable according to claim 1, characterized in that: Each layer of the tensile armor layer is a flat winding structure, that is, high modulus steel bars or high modulus fiber composite materials are spirally wound on the outer surface of the anti-external pressure armor skeleton layer in two layers, inside and outside, so as to maintain a small deformation and achieve resistance to anchor chain drag.

4. The impact-resistant sheath tube for a flexible coilable submarine cable according to claim 3, characterized in that: The spiral winding angle of each layer of the tensile armor layer is 20°~40°.

5. The impact-resistant sheath tube for a flexible coilable submarine cable according to claim 3, characterized in that: The two-petal structure of the impact-resistant layer is prefabricated with polyurethane foam material or concrete prefabricated material; when the tensile armor layer uses high modulus steel bars, the impact-resistant layer uses polyurethane foam material; when the tensile armor layer uses high modulus fiber composite materials, the impact-resistant layer needs to use concrete prefabricated materials according to weight requirements, thereby increasing the weight.

6. The impact-resistant sheath tube for a flexible coilable submarine cable according to claim 5, characterized in that: When polyurethane foam material is selected, the hardness of the polyurethane foam material needs to be controlled within Shore 80A~90A, and the two-petal structure of the polyurethane foam material is connected with adhesive or bolts to ensure that it has a certain degree of bending performance.

7. The impact-resistant sheath tube for a flexible coilable submarine cable according to claim 5, characterized in that: When precast concrete materials are used, the two-petal structure of the precast concrete materials is connected by bolts, and the precast concrete petal structure is a short circular tube structure in which concrete is precast, and the ends are connected by steel wires, and the steel wires are coaxially attached to the outer surface of the tensile armor layer; the length of the steel wires is determined according to the bending radius of the sheath tube, so that the sheath tube can be coiled.

8. The impact-resistant sheath tube for a flexible coilable submarine cable according to claim 1, characterized in that: The wear-resistant layer is made of nylon or polyurethane elastomer according to the underwater soil conditions, and is extruded onto the outer surface of the impact-resistant layer.

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