Maintenance device for offshore wind power submarine cable extending out of horn mouth

Abstract

The utility model relates to a maintenance device of an offshore wind power submarine cable from a horn mouth, which comprises a protective tube and the horn mouth, the protective tube wraps the outer side of one end of the submarine cable, one end of the protective tube is fixedly connected with the horn mouth, the submarine cable is sleeved with an elastic protective cylinder, the elastic protective cylinder is located on the side edge of the horn mouth, and the horn mouth is arranged on the elastic protective cylinder. The horn mouth is sleeved with a horn mouth clamp, the elastic protection cylinder is sleeved with a lower bearing taper sleeve, and the horn mouth clamp and the lower bearing taper sleeve are fixedly connected through a connecting bolt assembly. Fatigue damage of the submarine cable at the horn mouth part can be reduced, and safe operation of the submarine cable can be effectively guaranteed for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering submarine cable maintenance and construction, in particular to a maintenance device for an offshore wind power submarine cable coming out of a bell mouth. Background Art

[0002] In recent years, with the continuous development of offshore wind power and marine oil and gas development, submarine cables have been widely used. At present, most submarine cables are pulled to the platform through the J-tube horn on the offshore wind turbine platform to meet the needs of power transmission. Under the influence of external forces such as wind, waves, and currents, the submarine cable will be suspended and repeatedly swinging at the J-tube horn for a long time, which will cause the submarine cable to bend and fatigue. At the same time, the submarine cable will also be damaged by continuous friction with the inner wall of the J-tube. At present, during construction, the protective device for the submarine cable passing through the J-tube horn generally adopts a two-petal metal center clamp, and the tail is connected to a bending limiter to prevent the submarine cable from bending. The center clamp holds the submarine cable tightly and inserts it into the horn to fix and align the center of the submarine cable, preventing the submarine cable from shaking and rubbing at the J-tube horn for a long time. However, the center clamp exposed many problems and defects during the application process. Due to the severe scouring of the pile driver foundation, part of the submarine cable was suspended. When the submarine cable swings for a long time, the center clamp cannot guarantee long-term clamping of the submarine cable and it is easy to slip, resulting in a certain distance of exposure of the submarine cable at the bell mouth of the J-tube, which is directly damaged by friction with the bell mouth. Summary of the invention

[0003] The utility model aims to provide a maintenance device for an offshore wind power submarine cable coming out of a bell mouth, which can reduce fatigue damage of the submarine cable at the bell mouth part and can effectively ensure the safe operation of the submarine cable for a long time.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a maintenance device for an offshore wind power submarine cable coming out of a bell-mouth, comprising a protective tube and a bell-mouth, the protective tube covering the outside of one end of the submarine cable, one end of the protective tube being fixedly connected to the bell-mouth, an elastic protective tube being sleeved on the submarine cable, the elastic protective tube being located on the side of the bell-mouth, a bell-mouth clamp being sleeved on the bell-mouth, a lower load-bearing cone sleeve being sleeved on the elastic protective tube, and the bell-mouth clamp and the lower load-bearing cone sleeve being fixedly connected by a connecting bolt assembly.

[0005] Furthermore, the connecting bolt assembly includes a screw rod and a nut, a first flange ring is provided at the big head end of the lower bearing cone sleeve, a second flange ring is provided at the big head end of the bell-mouth clamp, a plurality of bolt holes are provided on the first flange ring, and a flange hole opposite to the bolt hole is provided on the second flange ring, the screw rod passes through the bolt hole and the flange hole, and the first flange ring and the second flange ring are locked by nuts at both ends of the screw rod.

[0006] Furthermore, the elastic protective tube is in the shape of a double cone structure, and interconnected openings are provided at both ends of the double cone structure. The elastic protective tube includes a plurality of cylinder segments, and the cylinder segments are arranged in a ring shape around the submarine cable.

[0007] Furthermore, the lower bearing cone sleeve is a conical cylinder, and an opening is provided on the side of the lower bearing cone sleeve.

[0008] Furthermore, the bell-mouth fixture is a conical structure, the bell-mouth fixture is a two-half structure, and a step capable of engaging the end of the bell-mouth is provided on the inner side wall of the large end of the bell-mouth fixture.

[0009] Furthermore, a plurality of evenly distributed lifting ears are provided on the outer surfaces of the second flange ring and the bell-mouth fixture.

[0010] The beneficial effects of the utility model are as follows: a double-conical elastic protective tube cast from polyurethane elastomer is used to wrap around the exposed part of the submarine cable at the bell mouth, and after clamping the submarine cable, the lower load-bearing cone sleeve at the lower end is pushed into the bell mouth, and fixed with the J-tube bell mouth, so that the exposed submarine cable and the bell mouth are adjusted, and there is no contact and friction damage. Through such a tapered elastic support, the submarine cable at the bell mouth position can also maintain the center position well when swinging, and the elastic protective tube can also effectively relieve the impact force and reduce the fatigue damage of the submarine cable at the bell mouth, which can effectively ensure the safe operation of the submarine cable in the long term. The maintenance device has a simple structure, a short processing cycle, low production and installation construction costs, no local hard bumps, and is stable and reliable for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the structure of the utility model equipped with an underwater hanger assembly;

[0013] Figure 3 It is a cross-sectional view of the structure of the utility model;

[0014] Figure 4 It is a structural schematic diagram of the bell mouth fixture in the utility model;

[0015] Figure 5 It is a structural schematic diagram of the elastic protection tube in the utility model;

[0016] Figure 6 It is a structural schematic diagram of the lower bearing cone sleeve in the utility model.

[0017] Among them: 11. protective tube, 12. bell mouth; 2. submarine cable; 3. elastic protective tube; 4. lower load-bearing cone sleeve; 41. opening, 5. bell mouth fixture; 51. step, 52. lifting ear, 6. connecting bolt assembly; 61. screw rod, 62. nut, 63. first flange ring, 64. second flange ring, 7. underwater hanger assembly, 71. metal hanger, 72. hand winch. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings.

[0019] See also Figures 1 to 6 The utility model provides an embodiment: a maintenance device for an offshore wind power submarine cable coming out of a bell-mouth, comprising a protective tube 11 and a bell-mouth 12, wherein the protective tube 11 is covered on the outside of one end of the submarine cable 2, and one end of the protective tube 11 is fixedly connected to the bell-mouth 12, an elastic protective tube 3 is sleeved on the submarine cable 2, and the elastic protective tube 3 is located on the side of the bell-mouth 12, a bell-mouth clamp 5 is sleeved on the bell-mouth 12, a lower load-bearing cone sleeve 4 is sleeved on the elastic protective tube 3, and the bell-mouth clamp 5 and the lower load-bearing cone sleeve 4 are fixedly connected by a connecting bolt assembly 6. The elastic protective tube 3 clamps the lip of the bell mouth 12 and slides the center clamp off the exposed submarine cable 2 to enhance protection and avoid wear and bending damage. The elastic protective tube 3 is manufactured by casting a mold with polyurethane elastomer, and the lower load-bearing cone sleeve 4 and the bell mouth clamp 5 are respectively mounted on the elastic protective tube 3 and the bell mouth 12, and are locked by connecting the bolt assembly 6, so that the exposed submarine cable 2 and the bell mouth 12 are adjusted and tightened to protect the exposed submarine cable 2.

[0020] Please continue reading Figure 1 As shown, in one embodiment of the utility model, the connecting bolt assembly 6 includes a screw and a nut, the large end of the lower bearing cone sleeve 4 is provided with a first flange ring, the large end of the bell-mouth fixture 5 is provided with a second flange ring, the first flange ring is provided with a plurality of bolt holes, the second flange ring is provided with a flange hole corresponding to the bolt hole, the screw passes through the bolt hole and the flange hole, and the two ends of the screw lock the first flange ring and the second flange ring by nuts. The connecting bolt assembly 6 is a screw and a nut that meet the requirements of corrosion resistance and load, and is inserted from the flange hole on the bell-mouth fixture 5 to the bolt hole corresponding to the lower bearing cone sleeve 4 and exits, and the lower bearing cone sleeve 4 is pulled by the pre-tightening nut to firmly wedge the elastic protective tube 3 of its inner ring sleeve into the bell mouth 12.

[0021] Please continue reading Figure 5As shown, in one embodiment of the utility model, the elastic protective tube 3 is in the shape of a double cone structure, and the two ends of the double cone structure are provided with interconnected openings, and the elastic protective tube 3 includes multiple cylinder segments, and the cylinder segments are arranged in a ring around the submarine cable 2. The elastic protective tube 3 is made by casting a mold with polyurethane elastomer, and is a double cone structure with tapers at both ends, and the internal is a through-hole segment, and the two ends are provided with interconnected openings slightly smaller than the outer diameter of the submarine cable 2. The circumference is divided into 2 pieces of the same size, and if the size is larger, it can be divided into 3 pieces. Through 2~3 segments wrapped around the outside of the submarine cable 2, an installation operation that can be passed through the middle package of the submarine cable 2 is formed, forming a conical protective sleeve. The upper cone head is embedded in the bell mouth 12, and the lower part is inserted into the lower bearing cone sleeve 4. Through the upper and lower wedging, it is firmly clamped on the outside of the submarine cable 2 to ensure the safety of the position at the bell mouth 12.

[0022] Please continue reading Figure 6 As shown, in one embodiment of the utility model, the lower bearing cone sleeve 4 is a conical cylinder, and an opening is provided on the side of the lower bearing cone sleeve 4. The lower bearing cone sleeve 4 is a conical structure made of steel plate rolled into a conical cylinder, with a flange at the end and an opening on the side. The lower bearing cone sleeve 4 is sleeved under the cone head of the elastic protective tube 3, and the flange at the end is tightened by the connecting bolt assembly 6 so that the lower bearing cone sleeve 4 is close to the bell-mouth clamp 5, and the inner and outer conical parts of the elastic protective tube 3 wrapped by it are wedged, forming a stable wrapping of the elastic protective tube 3 slices, and supporting its lower part, to ensure that the elastic protective tube 3 will not fall off the protective tube 11 and the bell-mouth 12. The width of the opening on the side needs to meet the requirement that the bending limiter previously installed on the submarine cable 2 and its outside can be stuck through, which is convenient for installation.

[0023] Please continue reading Figure 4 As shown, in one embodiment of the utility model, the bell-mouth fixture 5 is a conical structure, and the bell-mouth fixture 5 is a two-half structure, and a step 51 capable of clamping the end of the bell-mouth 12 is provided on the inner side wall of the large end of the bell-mouth fixture 5. The bell-mouth fixture 5 is made of steel plates rolled and welded and then machined to form a two-half structure, and the whole is conical, and the large end is provided with a step 51 capable of clamping the end of the bell-mouth 12. The bell-mouth 12 is fixed by clamping the end of the large end of the bell-mouth 12 by tightening the two halves, and the inner step 51 clamps the end of the large end of the bell-mouth 12.

[0024] Please continue reading Figure 4As shown, in one embodiment of the utility model, a plurality of evenly distributed lifting ears 52 are arranged on the outer surface of the second flange ring and the bell-mouth fixture 5. The outer surface of the second flange ring and the bell-mouth fixture 5 also has evenly distributed lifting ears 52. When installed at sea, it is necessary to ensure that a longitudinal lifting point is facing upward so that the lower part of the metal hanger 71 of the underwater hanger assembly 7 can be installed in position. It can be temporarily used underwater by fixing it with a pin or bolt through the hole of the lifting ear 52, which is also convenient for untying and recycling after construction. The remaining lifting points are mainly convenient for hanging during construction and temporary binding fixing points during installation of the elastic protection tube 3 and the lower bearing cone sleeve 4, which promotes construction efficiency; the lifting ear 52 of the bell-mouth fixture 5 is used to install the underwater hanger assembly 7, and the underwater hanger assembly 7 includes a metal hanger 71, one end of which is fixed on the lifting ear 52, and the other end of the metal hanger 71 is provided with a hanging hole, and a hand winch 72 is hung on the hanging hole.

[0025] The method of using the utility model is:

[0026] 1. Design and manufacture various components according to the size of the submarine cable 2, the protective tube 11 and the bell mouth 12, use a mold to cast the elastic protective tube 3 with polyurethane elastomer, and use steel plates to roll, weld and then machine to manufacture the lower bearing cone sleeve 4 and the bell mouth fixture 5;

[0027] 2. After arriving at the construction site, the diver finds the position where the submarine cable 2 escapes from the protective tube 11 and the bell mouth 12 underwater, cleans the marine organisms on the exposed section of the submarine cable 2, and also cleans the marine organisms on the part where the bell mouth fixture 5 is installed at the bell mouth 12, and then lowers the bell mouth fixture 5 to the underwater diver, one of which has been pre-installed with the metal hanger 71 in the underwater hanger assembly 7. The two-flap bell mouth fixture 5 is closed by bolts and clamped on the end of the large head end of the bell mouth 12, and the position is adjusted so that the metal hanger 71 in the underwater hanger assembly 7 faces upward, and the bolts are tightened to install the bell mouth fixture 5, and the hand chain hoist 72 in the underwater hanger assembly 7 is lowered into the water and hung in the hanging hole at the upper end of the metal hanger 71, and the length of the hoisting chain hook of the hand chain hoist 72 is adjusted;

[0028] 3. Put the segments of the elastic protective tube 3 into the water, temporarily hang them on the hook of the hand chain hoist 72 of the underwater hanger assembly 7, adjust the segments to wrap the exposed position of the submarine cable 2, do temporary binding to prevent the segments from falling off, and then install the remaining segments to form a complete cone tube, put the lower bearing cone sleeve 4 into the water, temporarily hang it on the hook of the hand chain hoist 72 of the underwater hanger assembly 7, adjust it so that its lateral opening is stuck on the submarine cable 2, put the submarine cable 2 inside, adjust the lower bearing cone sleeve 4 to be sleeved on the lower cone section of the elastic protective tube 3, preliminarily adjust the position of the bolt holes on the lower bearing cone sleeve 4 to be consistent with the flange holes on the bell-mouth fixture 5, and do temporary binding;

[0029] 4. Insert the screw in the connecting bolt assembly 6 from the flange hole on the bell-mouth fixture 5, and the screw passes through the bolt hole corresponding to the lower bearing cone sleeve 4. Install the nuts at both ends and preliminarily pre-tighten them. Then check whether the elastic protection tube 3 is installed in the bell-mouth 12, remove the hand winch 72 of the underwater hanger assembly 7 and the metal hanger 71 of the underwater hanger assembly 7, and tighten multiple sets of connecting bolt assemblies 6 in a circle according to the flange bolt tightening principle until the required tightening torque is met and the construction is completed.

[0030] The utility model has the following working principle: the exposed part of the submarine cable at the bell mouth is wrapped with an elastic protective tube, and after the submarine cable is clamped, it is pushed into the bell mouth by the lower bearing cone sleeve at the lower end, and fixed with the bell mouth fixture through a connecting bolt assembly, so that the exposed submarine cable and the bell mouth are adjusted, and there is no contact and friction damage. Through such a tapered elastic support, the submarine cable at the bell mouth position can also maintain the center position well when swinging, and the elastic protective tube can also well relieve the impact force, reduce the fatigue damage of the submarine cable at the bell mouth part, and can effectively ensure the safe operation of the submarine cable for a long time.

[0031] The above description is only a preferred embodiment of the present invention and should not be construed as a limitation to the present application. All equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A maintenance device for an offshore wind power cable coming out of a bell mouth, characterized in that: It includes a protective tube and a bell mouth, the protective tube is covered on the outer side of one end of the submarine cable, one end of the protective tube is fixedly connected to the bell mouth, the submarine cable is sleeved with an elastic protective tube, the elastic protective tube is located on the side of the bell mouth, the bell mouth is sleeved with a bell mouth clamp, the elastic protective tube is sleeved with a lower load-bearing cone sleeve, the bell mouth clamp and the lower load-bearing cone sleeve are fixedly connected by a connecting bolt assembly; the connecting bolt assembly includes a screw rod and a nut, the big head end of the lower load-bearing cone sleeve is provided with a first flange ring, the big head end of the bell mouth clamp is provided with a second flange ring, a plurality of bolt holes are opened on the first flange ring, and a flange hole corresponding to the position of the bolt hole is opened on the second flange ring, the screw rod passes through the bolt hole and the flange hole, and the two ends of the screw rod are locked to the first flange ring and the second flange ring by nuts.

2. A maintenance device for an offshore wind power cable exiting from a bell mouth according to claim 1, characterized in that: The elastic protective tube is in the shape of a double cone structure, with interconnected openings at both ends of the double cone structure. The elastic protective tube comprises a plurality of cylinder segments, and the cylinder segments are arranged in a ring shape around the submarine cable.

3. The maintenance device for an offshore wind power cable exiting from a bell mouth according to claim 1, characterized in that: The lower bearing cone sleeve is a conical cylinder, and an opening is provided on the side of the lower bearing cone sleeve.

4. The maintenance device for an offshore wind power cable exiting from a bell mouth according to claim 1, characterized in that: The bell-mouth fixture is a conical structure and a two-half structure. A step capable of clamping the end of the bell-mouth is arranged on the inner side wall of the large head end of the bell-mouth fixture.

5. The maintenance device for an offshore wind power cable coming out of a bell mouth according to claim 1, characterized in that: A plurality of evenly distributed lifting ears are arranged on the outer surfaces of the second flange ring and the bell-mouth fixture.

Images