Submarine cable intermediate joint self-punching-burying structure and punching-burying method thereof
By designing the self-burning structure of the middle joint of the submarine cable and using the self-burning hard pipe and hose to plow the seabed, the problems of low laying efficiency of the intermediate joint and the risk of seabed collapse are solved, and efficient and safe laying of the submarine cable is achieved.
Patent Information
- Application Number
- CN202510002824.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-05-13
AI Technical Summary
During the laying and repair process, it is difficult to directly arrange the submarine cable in the underwater bed by burying plows, and it is easily damaged by ships, etc., and the existing manual burying method is inefficient and has a risk of seabed collapse.
Design a self-burning structure of the middle joint of the submarine cable, including the middle joint, bending limiter, bending hard pipe and bending hose. When the intermediate joint sinks into the seabed, the burial hard pipes and hoses plow the seabed by themselves to form sinking grooves to bury the middle joints without the assistance of underwater robots or divers.
The efficient laying of intermediate joints under the seabed is achieved, reducing labor costs and underwater operation risks, improving operation efficiency, and reducing the probability of seabed collapse.
Smart Images
Figure CN119994776A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of submarine cables, in particular to a submarine cable intermediate joint self-embedding structure and an embezzling method thereof. Background Art
[0002] During the laying, splicing or repair of submarine cables, intermediate joints are often used. However, intermediate joints cannot be directly laid under the seabed using a plough. Intermediate joints on the surface of the seabed are very easy to be damaged by passing ship anchors, fishing boats trawls, etc.
[0003] At present, the main way to protect the middle joint is to use underwater robots or divers to manually flush and bury it. After the middle joint is arranged on the seabed, the underwater robot or diver carries a spray gun into the water to plow the seabed, so that the middle joint is sunk into the seabed mud. Because this flushing and burying method is manual flushing and burying, the power, flow rate, and spray force of the plowing device used must not be too high, and the plowing efficiency is very low. At the same time, there is a risk of seabed collapse during the plowing process, which puts the underwater robot and diver at risk of being buried. Summary of the invention
[0004] The technical problem to be solved by the present invention is to provide a submarine cable intermediate joint self-embedding structure and an embezzling method thereof, which can ensure that the intermediate joint is laid under the seabed and can ensure the laying efficiency of the intermediate joint.
[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a self-buried structure of an intermediate joint of a submarine cable, comprising a main body, the main body comprising an intermediate joint, the intermediate joint being used to wrap a repair area of a sealed cable, both ends of the intermediate joint being connected to a bend limiter, the bend limiter bends within a limited angle range to limit the bending angle of the cable, a plurality of buried hard pipes are provided on the outer ring of the intermediate joint, the buried hard pipes are provided with hard pipe burying holes for flushing and plowing seabed mud, the plurality of buried hard pipes are arranged parallel to the axial direction of the intermediate joint and distributed on the circumference of the intermediate joint, both ends of each of the buried hard pipes are provided with a buried hose, the buried hose is provided with a hose burying hole for flushing and plowing seabed mud, and the buried hose is bent synchronously with the bend limiter.
[0006] Compared with the prior art, the advantages of the present invention are: when the middle joint sinks to the seabed, the flushing and burying hard pipe and the flushing and burying hose will plow the seabed by themselves, and plow out a sinking groove for burying the middle joint on the seabed. During the plowing process of the flushing and burying hard pipe and the flushing and burying hose, no underwater robot or diver's assistance is required, which not only saves labor costs but also reduces the danger of underwater operations. When the main body is plowing, the plowing can be continued downward by relying on the gravity of the main body to ensure the accuracy of the plowing direction, and the design that the multiple flushing and burying hard pipes are all parallel to the axial arrangement of the middle joint and distributed on the circumference of the middle joint can ensure that the seabed is plowed comprehensively during the flushing and burying, and it will not only flush downward but also spray around to avoid the mud and sand plowed out from flowing back into the sinking groove, and also reduce the probability of seabed collapse due to the sinking groove not being plowed during the plowing process. At the same time, because When plowing just starts, the surface of the seabed is a flat area, and the initial plowing process of the seabed is prone to dispersion. At this time, the bending characteristics of the flushing and burying hose are used to apply the plowing force of the flushing and burying hose to the plowing area close to the flushing and burying hard pipe, which makes it easier to destroy the flatness of the seabed. Then, the flushing and burying hose can slowly reset naturally after it contacts the seabed, and can plow along the plowing area with destroyed flatness to the bottom of the flushing and burying hose, thereby greatly reducing the difficulty of plowing the seabed; then the flushing and burying hard pipe and the flushing and burying hose synchronously plow out a trough for burying the intermediate joint. During the flushing and burying process, the plowing force of the flushing and burying hard pipe and the flushing and burying hose can be much greater than the force of manual plowing, and there is no need to worry about the risk of the operation, thereby achieving the purpose of laying the intermediate joint under the seabed, reducing labor costs, reducing the risk of underwater operations and improving operation efficiency.
[0007] As an improvement of the present invention, there are four flushing and buried hard pipes in total, and the four flushing and buried hard pipes are respectively arranged at the four corners of the inclined diagonal line, and the four flushing and buried hard pipes include two upper flushing and buried hard pipes arranged at the upper end and two lower flushing and buried hard pipes arranged at the lower end. The flushing and buried hoses at both ends of the two upper flushing and buried hard pipes are upper flushing and buried hoses, and the flushing and buried hoses at both ends of the two lower flushing and buried hard pipes are lower flushing and buried hoses. Through the improvement, the distribution of the flushing and buried hard pipes and the flushing and buried hoses is realized, and at the same time, the flushing and buried hard pipes and the flushing and buried hoses are distributed at the four corners of the inclined diagonal line, which can ensure the balance of the main body during the flushing and plowing process, reduce the problem of uneven force during the plowing process, and thus ensure the stability of the main body during the plowing process.
[0008] As an improvement of the present invention, a total of four rows of upper punching and buried holes are arranged on the upper punching and buried hard pipe and the upper punching and buried soft pipe. The four rows of upper punching and buried holes are respectively formed from the longitudinal symmetry plane of the middle joint to the transverse symmetry plane of the middle joint along the side away from the middle joint, namely, canopy holes, upper punching holes, upper expansion holes and upper horizontal holes. The canopy holes are arranged obliquely upward toward the longitudinal symmetry plane of the middle joint, the upper punching holes are arranged at the top of the upper punching and buried hard pipe and obliquely upward away from the longitudinal symmetry plane of the middle joint, the upper expansion holes are arranged obliquely above the upper punching and buried hard pipe and along the radial direction of the upper punching and buried hard pipe, and the upper horizontal holes are arranged along the horizontal radial direction of the upper punching and buried hard pipe, and the inclination angles of the upper punching holes, the upper expansion holes and the upper horizontal holes decrease successively. According to the improvement, the two canopy holes can form a water curtain barrier above the main body to prevent the mobile sediment discharged by plowing from accumulating on the upper end of the main body, thereby affecting the balance of the main body; the design of the upper punching hole, the upper expansion hole and the upper horizontal hole can spray the side walls of the trough after the main body sinks into the seabed. Although this will expand the width of the trough and form more mobile sediment, it can prevent the trough from collapsing before the specified plowing depth is completed, thereby ensuring the plowing quality of the trough. At the same time, before the spraying water flow of the upper expansion hole and the upper punching hole sinks into the trough, it can also drive the sediment to the two sides of the trough to be discharged, thereby reducing the deposition of mobile sediment discharged by plowing in the trough during the plowing process, thereby ensuring the smoothness of the trough in the initial plowing stage.
[0009] As an improvement of the present invention, a total of five rows of lower punching and buried holes are arranged on the lower punching and buried hard pipe and the lower punching and buried hose, and the five rows of lower punching and buried holes are respectively inner punching holes, lower inner punching holes, lower punching holes, lower outer punching holes and outer punching holes from the longitudinal symmetry plane of the middle joint to the transverse symmetry plane of the middle joint along the side away from the middle joint, the inner punching holes are arranged obliquely downward toward the longitudinal symmetry plane of the middle joint, the lower inner punching holes are also arranged obliquely downward toward the longitudinal symmetry plane of the middle joint, and the extension line of the inner punching holes intersects with the extension line of the lower inner punching holes at the longitudinal symmetry plane of the middle joint, the lower punching holes are arranged downward, the lower outer punching holes are arranged obliquely downward away from the longitudinal symmetry plane of the middle joint, the outer punching holes are arranged obliquely downward away from the longitudinal symmetry plane of the middle joint, and the extension line of the lower outer punching holes intersects with the extension line of the outer punching holes at the outer punching intersection, and the distance between the outer punching intersections on both sides is large Regarding the width of the main body, through the improvement, the inner punching hole, lower inner punching hole, lower punching hole, lower outer punching hole and outer punching hole are divided into three groups of plowing areas. Because the plowing process needs to destroy the flatness of the seabed, the deeper the depth, the greater the difficulty of plowing. In order to ensure the effectiveness of the plowing, the inner punching hole and the lower inner punching hole form an inner plow, and the lower outer punching hole and the outer punching hole form an outer plow. After the inner plowing and the outer plowing are completed, the strength of the seabed between the inner plow and the outer plow will decrease, and then the inner plow and the outer plow will be plowed through the lower punching hole, so as to ensure the stability and efficiency of the plowing below the main body, avoid uneven plowing area or low plowing effectiveness, resulting in the inability of the main body to sink quickly to complete the laying purpose; wherein the distance between the outer punching intersections on both sides is greater than the width of the main body in order to ensure the plowing width of the main body and ensure that the main body can sink smoothly into the sinking trough.
[0010] As an improvement of the present invention, the four buried rigid pipes are fixedly connected by a plurality of connecting pipes arranged along the axial direction of the main body, and limiting flanges are provided at both ends of the intermediate joint, and the connecting pipes at both ends respectively abut against one side of the two limiting flanges close to the center of the main body. Through the improvement, the relative position connection of the four buried rigid pipes is realized, and the stability of the plowing process of the four buried rigid pipes is ensured, and the design of the limiting flange ensures the connection stability between the four buried rigid pipes and the intermediate joint, avoiding separation of the intermediate joint and the buried rigid pipe.
[0011] As an improvement of the present invention, a water inlet pipe is connected between the four flushing and buried hard pipes, the water inlet pipe is communicated with the four flushing and buried hard pipes, the water inlet pipe is arranged at the center of the main body, and a water inlet is provided at the upper end of the water inlet pipe. Through the improvement, pressurized water injection is achieved in the flushing and buried hard pipes and the flushing and buried soft pipes, thereby realizing the flushing and plowing operation of the flushing and buried hard pipes and the flushing and buried soft pipes, and only one water inlet is designed to ensure the stability of the water pressure, avoiding problems such as uneven plowing depths of the seabed and sinking and tilting of the main body when plowing the seabed; and the water inlet is arranged at the upper end of the water inlet pipe to facilitate the connection and separation of the water inlet.
[0012] As an improvement of the present invention, the water inlet is connected to an underwater water pump through a pipeline, and the length of the pipeline is longer than the burial depth of the main body. Through the improvement, the pressurized water injection of the main body is first achieved by the underwater water pump; and the design of the underwater water pump can reduce the length requirement of the pipeline, thereby reducing the pressure attenuation away from the pressure transmission, especially when laying intermediate joints in offshore areas, the seabed depth may exceed 1KM, and the conventional water supply pump installed on the laying ship can hardly meet the water pressure supply demand. The design of the underwater water pump can reduce the distance between the underwater water pump and the main body, avoid the attenuation of the supply water pressure, and directly extract seawater to plow the seabed; and the length of the pipeline is longer than the burial depth of the main body in order to avoid the underwater water pump from entering the trough, thereby ensuring the safety of the underwater water pump.
[0013] As an improvement of the present invention, an electric-controlled connecting clamp is provided at one end of the pipe connected to the water inlet, and the electric-controlled connecting clamp is used to fix or release the fixation with the water inlet. Through the improvement, the pipe and the water inlet are automatically unlocked after the laying of the main body is completed, and there is no need to manually release the connection. Then, it is only necessary to directly recover the pipe and the electric-controlled connecting clamp, and the flushing hard pipe and the flushing hose are directly buried together with the middle joint. Then, the flushing plow of the water flow is lacking in the trough. Under the action of the ocean current, the seabed will automatically fill the trough to complete the burial of the main body.
[0014] As an improvement of the present invention, the four flushing and burying hoses are fixedly connected by a plurality of connecting rings arranged along the axial direction of the bend limiter. Through the improvement, the relative position connection of the four flushing and burying hoses is achieved, ensuring the stability of the flushing and burying process of the four flushing and burying hoses.
[0015] A flushing and burying method for a submarine cable intermediate joint self-flushing and burying structure is used to complete a flushing and burying operation of a submarine cable intermediate joint self-flushing and burying structure, and the steps are as follows:
[0016] S1: The middle joint is suspended, and the bend limiter droops naturally;
[0017] S2: When the main body sinks close to the seabed and the bend limiter remains in a naturally drooping state, the underwater pump is turned on, the hard pipe flushing hole is used to plow the seabed directly below, and the soft pipe flushing hole is used to plow the connection between the middle joint and the bend limiter;
[0018] S3: the body continues to sink, and the bend limiter abuts against the seabed;
[0019] S4: The bend limiter is straightened, and the middle joint sinks into the initial groove plowed out by the flushing hard pipe and the flushing hose;
[0020] S5: The suspension of the middle joint is released by an underwater robot or a diver, and only the connection between the underwater pump and the water inlet is maintained;
[0021] S6: Use the simple hanging connection of the pipeline and the plowing reaction force of the buried hard pipe to reduce the sinking speed, ensure that the buried hard pipe and the buried hose fully plow the surrounding area, so that the main body keeps sinking horizontally;
[0022] S6: sinking to the specified depth, the electric control connection clamp is disconnected from the water inlet;
[0023] S7: Recover the underwater pump and the electric control connection clamp.
[0024] Compared with the prior art, the advantages of the present invention are: when the middle joint sinks to the seabed, the flushing and burying hard pipe and the flushing and burying hose will plow the seabed by themselves, and plow out a sinking groove for burying the middle joint on the seabed. During the plowing process of the flushing and burying hard pipe and the flushing and burying hose, no underwater robot or diver's assistance is required, which not only saves labor costs but also reduces the danger of underwater operations. When the main body is plowing, the plowing can be continued downward by relying on the gravity of the main body to ensure the accuracy of the plowing direction, and the design that the multiple flushing and burying hard pipes are all parallel to the axial arrangement of the middle joint and distributed on the circumference of the middle joint can ensure that the seabed is plowed comprehensively during the flushing and burying, and it will not only flush downward but also spray around to avoid the mud and sand plowed out from flowing back into the sinking groove, and also reduce the probability of seabed collapse due to the sinking groove not being plowed during the plowing process. At the same time, because When plowing just starts, the surface of the seabed is a flat area, and the initial plowing process of the seabed is prone to dispersion. At this time, the bending characteristics of the flushing and burying hose are used to apply the plowing force of the flushing and burying hose to the plowing area close to the flushing and burying hard pipe, which makes it easier to destroy the flatness of the seabed. Then, the flushing and burying hose can slowly reset naturally after it contacts the seabed, and can plow along the plowing area with destroyed flatness to the bottom of the flushing and burying hose, thereby greatly reducing the difficulty of plowing the seabed; then the flushing and burying hard pipe and the flushing and burying hose synchronously plow out a trough for burying the intermediate joint. During the flushing and burying process, the plowing force of the flushing and burying hard pipe and the flushing and burying hose can be much greater than the force of manual plowing, and there is no need to worry about the risk of the operation, thereby achieving the purpose of laying the intermediate joint under the seabed, reducing labor costs, reducing the risk of underwater operations and improving operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the application structure of the present invention.
[0026] Figure 2 It is a schematic diagram of the overall structure of the present invention.
[0027] Figure 3It is a schematic diagram of the plowing water flow structure of the main body of the present invention against the seabed (the dotted line is the plowing water flow).
[0028] Figure 4 It is a schematic diagram of the plowing water flow structure of the upper flushing buried hole of the present invention (the dotted line is the plowing water flow).
[0029] Figure 5 It is a schematic diagram of the plowing water flow structure of the downward flushing buried hole of the present invention (the dotted line is the plowing water flow).
[0030] Figure 6 It is a schematic diagram of the plowing water flow structure when the main body of the present invention is just sunk into the sink (the dotted line is the plowing water flow).
[0031] Figure 7 It is a schematic diagram of the plowing water flow structure of the main body of the present invention being completely immersed in the sink (the dotted line is the plowing water flow).
[0032] As shown in the figure: 1. Middle joint, 1.1. Limit flange, 2. Bending limiter, 3. Buried hard pipe, 3.1. Upper buried hard pipe, 3.2. Lower buried hard pipe, 4. Buried hose, 4.1. Upper buried hose, 4.2. Lower buried hose, 5. Upper buried hole, 5.1. Canopy hole, 5.2. Upper punching hole, 5.3. Upper expansion hole, 5.4. Upper horizontal hole, 6. Lower buried hole, 6.1. Inner punching hole, 6.2. Lower inner punching hole, 6.3. Lower punching hole, 6.4. Lower outer punching hole, 6.5. Outer punching hole, 6.6. Outer punching intersection, 7. Connecting pipe, 8. Water inlet pipe, 8.1. Water inlet, 9. Underwater pump, 10. Pipeline, 11. Electric control connecting clamp, 12. Connecting ring, 13. Suspension bracket, 14. Sink. DETAILED DESCRIPTION
[0033] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.
[0034] like Figure 1-2 As shown, a self-buried structure of an intermediate joint of a submarine cable comprises a main body, wherein the main body comprises an intermediate joint 1, wherein the intermediate joint 1 is used to wrap a repair area of a sealed cable, both ends of the intermediate joint 1 are connected to a bend limiter 2, wherein the bend limiter 2 is bent within a limited angle range to limit the bending angle of the cable, and a plurality of buried hard pipes 3 are provided on the outer ring of the intermediate joint 1, wherein the buried hard pipes 3 are provided with hard pipe burying holes for flushing and plowing seabed mud, wherein the plurality of buried hard pipes 3 are arranged parallel to the axial direction of the intermediate joint 1 and are distributed on the circumference of the intermediate joint 1, and a flushing hose 4 is provided at both ends of each of the buried hard pipes 3, wherein the flushing hose 4 is provided with a hose flushing hole for flushing and plowing seabed mud, and the flushing hose 4 is bent synchronously with the bend limiter 2.
[0035] like Figure 2 , Figure 6 , Figure 7As shown, there are four embedded rigid tubes 3, which are respectively arranged at the four corners of the inclined diagonal line. The four embedded rigid tubes 3 include two upper embedded rigid tubes 3.1 arranged at the upper end and two lower embedded rigid tubes 3.2 arranged at the lower end. The embedded hoses 4 at both ends of the two upper embedded rigid tubes 3.1 are upper embedded hoses 4.1, and the embedded hoses 4 at both ends of the two lower embedded rigid tubes 3.2 are lower embedded hoses 4.2. The embedded holes of the rigid tubes include upper embedded holes 5 arranged on the embedded rigid tubes 3 and lower embedded holes 6 arranged on the embedded rigid tubes 3. The embedded holes of the hoses include upper embedded holes 5 arranged on the embedded hoses 4 and lower embedded holes 6 arranged on the embedded hoses 4.
[0036] like Figure 4-7 As shown, the upper punch buried hard pipe 3.1 and the upper punch buried hose 4.1 are provided with four rows of upper punch buried holes 5, and the four rows of upper punch buried holes 5 are respectively a canopy hole 5.1, an upper punch hole 5.2, an upper expansion hole 5.3 and an upper horizontal hole 5.4 along the side away from the middle joint 1 from the longitudinal symmetric surface of the middle joint 1 to the transverse symmetric surface of the middle joint 1, and the canopy hole 5.1 is arranged obliquely upward toward the longitudinal symmetric surface of the middle joint 1, and the upper punch hole 5.2 is arranged at the top of the upper punch buried hard pipe 3.1 and is inclined The upper expansion hole 5.3 is arranged upwardly away from the longitudinal symmetric plane of the middle joint 1, and is arranged above the upper punch buried hard tube 3.1 and along the radial direction of the upper punch buried hard tube 3.1. The upper horizontal hole 5.4 is arranged along the horizontal radial direction of the upper punch buried hard tube 3.1. The inclination angles of the upper punch hole 5.2, the upper expansion hole 5.3, and the upper horizontal hole 5.4 decrease successively. In order to ensure the coverage of the canopy hole 5.1, the canopy hole 5.1 uses a long waist hole arranged along the axial direction of the body in the length direction; the lower punch buried hard tube 3.2 and the upper horizontal hole 5.4 are arranged along the horizontal radial direction of the upper punch buried hard tube 3.1. A total of five rows of lower punching holes 6 are arranged on the lower punching buried hose 4.2, and the five rows of lower punching holes 6 are respectively inner punching holes 6.1, lower inner punching holes 6.2, lower punching holes 6.3, lower outer punching holes 6.4 and outer punching holes 6.5 from the longitudinal symmetric surface of the intermediate joint 1 to the transverse symmetric surface of the intermediate joint 1 along the side away from the intermediate joint 1, and the inner punching holes 6.1 are arranged obliquely downward toward the longitudinal symmetric surface of the intermediate joint 1, and the lower inner punching holes 6.2 are also arranged obliquely downward toward the longitudinal symmetric surface of the intermediate joint 1, and The extension line of the inner punching hole 6.1 and the extension line of the lower inner punching hole 6.2 intersect at the longitudinal symmetry plane of the middle joint 1, the lower punching hole 6.3 is arranged downward, the lower outer punching hole 6.4 is arranged obliquely downward away from the longitudinal symmetry plane of the middle joint 1, the outer punching hole 6.5 is arranged obliquely downward away from the longitudinal symmetry plane of the middle joint 1, and the extension line of the lower outer punching hole 6.4 and the extension line of the outer punching hole 6.5 intersect at the outer punching intersection point 6.6, and the distance between the outer punching intersection points 6.6 on both sides is greater than the width of the body.
[0037] like Figure 2 , Figure 3As shown, the four embedded rigid pipes 3 are fixedly connected by a plurality of connecting pipes 7 arranged along the axial direction of the main body, and the two ends of the intermediate joint 1 are provided with limit flanges 1.1, and the connecting pipes 7 at the two ends are respectively abutted against the side of the two limit flanges 1.1 close to the center of the main body. A water inlet pipe 8 is also connected between the four embedded rigid pipes 3, and the water inlet pipe 8 is communicated with the four embedded rigid pipes 3. The water inlet pipe 8 is arranged at the center of the main body, and a water inlet 8.1 is provided at the upper end of the water inlet pipe 8. The water inlet 8.1 is connected to an underwater water pump 9 through a pipe 10, and the length of the pipe 10 is longer than the burial depth of the main body. The four embedded hoses 4 are fixedly connected by a plurality of connecting rings 12 arranged along the axial direction of the bend limiter 2.
[0038] like Figure 1 , Figure 6 , Figure 7 As shown, one end of the pipe 10 connected to the water inlet 8.1 is provided with an electric control connection clamp 11, and the electric control connection clamp 11 is used to fix or release the water inlet 8.1. During the laying of the body, a crane will be used to lift a suspension frame 13, and the suspension frame 13 uses a steel bar hook and a lifting ring at the upper end of the middle joint 1 to suspend the body, and then the lowering speed of the body is controlled by the crane. At the same time, the underwater pump 9 is also suspended on the crane. When the body is sunk, the underwater pump 9 and the suspension frame 13 sink synchronously. After the body reaches the seabed, the suspension frame 13 remains stationary or is recovered, and the underwater pump 9 and the body continue to sink. At the same time, the steel bars used to hang the underwater pump 9 are connected in parallel with electric wires to control the opening and closing of the underwater pump 9 and the fixing and releasing of the electric control connection clamp 11, or directly use a conventional underwater remote control system to control the underwater pump 9 and the electric control connection clamp 11. In order to ensure the stability of the underwater water pump 9 and avoid the suction of mud and sand, a filter net will be installed at the water suction port of the underwater water pump 9.
[0039] The above-mentioned intermediate joint 1, bend limiter 2, suspension frame 13, underwater water pump 9, electric control connection clamp 11 and crane are all conventional equipment.
[0040] like Figure 1 , Figure 3 , Figure 6 , Figure 7 As shown, a method for flushing and burying a submarine cable intermediate joint self-buried structure is used to complete the flushing and burying operation of a submarine cable intermediate joint self-buried structure, and the steps are as follows:
[0041] S1: The middle joint 1 is suspended, and the bend limiter 2 droops naturally;
[0042] S2: When the main body sinks close to the seabed and the bend limiter 2 remains in a naturally drooping state, the underwater pump 9 is turned on, the hard pipe flushing hole is used to plow the seabed directly below, and the soft pipe flushing hole is used to plow the connection between the middle joint 1 and the bend limiter 2;
[0043] S3: the body continues to sink, and the bend limiter 2 abuts against the seabed;
[0044] S4: the bend limiter 2 is straightened, and the intermediate joint 1 sinks into the initial groove plowed out by the flushing hard pipe 3 and the flushing hose 4;
[0045] S5: The suspension of the intermediate joint 1 by the suspension bracket 13 is released by an underwater robot or a diver, and only the connection between the underwater pump 9 and the water inlet 8.1 is maintained;
[0046] S6: Using the simple hanging connection of the pipe 10 and the plowing reaction force of the buried hard pipe 3, the sinking speed is reduced to ensure that the buried hard pipe 3 and the buried hose 4 fully plow the surrounding area, so that the main body keeps sinking horizontally;
[0047] S6: sinking to a specified depth, the electric control connection clamp 11 releases the connection with the water inlet 8.1;
[0048] S7: Recover the underwater water pump 9 and the electric control connecting clamp 11.
[0049] In step S6, the flushing and burying hard pipe 3 and the flushing and burying hose 4 will plow the seabed by themselves, and plow out a sink 14 for burying the middle joint 1 on the seabed. During the plowing process of the flushing and burying hard pipe 3 and the flushing and burying hose 4, no underwater robot or diver's assistance is required, which not only saves labor costs but also reduces the danger of underwater operations. When the main body is plowing, the gravity of the main body can be relied on to continuously plow downward to ensure the accuracy of the plowing direction, and the design that multiple flushing and burying hard pipes 3 are all arranged parallel to the axial direction of the middle joint 1 and distributed on the circumference of the middle joint 1 can ensure that when flushing and burying, the seabed is plowed comprehensively, and it will not only be flushed downward, but also sprayed around to avoid the mud and sand plowed out from flowing back to the sink 1 4, and also reduces the probability of the seabed collapsing due to the failure of the ploughing of the sinking groove 14 during the ploughing process; at the same time, because the surface of the seabed is a flat area at the beginning of ploughing, the initial ploughing process of the seabed is prone to dispersion, and at this time, the bending characteristics of the flushing and burying hose 4 are used to apply the ploughing force of the flushing and burying hose 4 to the ploughing area close to the flushing and burying hard pipe 3, so that it is easier to destroy the flatness of the seabed, and then the flushing and burying hose 4 can be slowly reset naturally after contacting the seabed, and can plough along the ploughing area with destroyed flatness to the bottom of the flushing and burying hose 4, thereby greatly reducing the difficulty of ploughing the seabed; and then the flushing and burying hard pipe 3 and the flushing and burying hose 4 synchronously plow out the sinking groove 14 for burying the middle joint 1; Figure 6 , Figure 7As shown, the two canopy holes 5.1 can form a water curtain barrier above the main body to prevent the mobile sediment produced by plowing from accumulating on the upper end of the main body, thereby affecting the balance of the main body; the design of the upper punching hole 5.2, the upper expansion hole 5.3, and the upper horizontal hole 5.4 can spray the side wall of the trough 14 after the main body sinks into the seabed. Although it will expand the width of the trough 14 and form more mobile sediment, it can prevent the trough 14 from collapsing before the specified depth of the plowing is completed, thereby ensuring the plowing quality of the trough 14. At the same time, before the spraying water flow of the upper expansion hole 5.3 and the upper punching hole 5.2 sinks into the trough 14, it can also drive the sediment to the two sides of the trough 14 to reduce the deposition of the mobile sediment produced by the plowing in the trough 14 during the plowing process, thereby ensuring the smoothness of the trough 14 in the initial plowing stage; and the inner punching hole 6.1, the lower inner punching hole 6.2, the lower punching hole 6.3, the lower outer punching hole 6.4 and the outer punching hole 6.5 form There are three groups of plowing areas. Because the plowing process needs to destroy the flatness of the seabed, the deeper the depth, the more difficult the plowing will be. In order to ensure the effectiveness of the plowing, the inner punching hole 6.1 and the lower inner punching hole 6.2 form an inner plow, and the lower outer punching hole 6.4 and the outer punching hole 6.5 form an outer plow. After the inner plowing and the outer plowing are completed, the strength of the seabed between the inner plow and the outer plow will decrease, and then the lower punching hole 6.3 is used to plow between the inner plow and the outer plow, thereby ensuring the stability and efficiency of the plowing below the main body, avoiding uneven plowing areas or low plowing effectiveness, resulting in the main body being unable to sink quickly to complete the purpose of laying; in the burying process, the plowing force of the burying hard pipe 3 and the burying hose 4 can be much greater than the force of the manual plowing, and there is no need to worry about the risk of the operation, thereby achieving the purpose of laying the intermediate joint 1 under the seabed, reducing labor costs, reducing underwater operation risks and improving operation efficiency.
[0050] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.
Claims
1. A self-buried structure for an intermediate joint of a submarine cable, comprising a body, characterized in that: The body comprises an intermediate joint (1), the intermediate joint (1) being used to wrap a repair area of a sealed cable, both ends of the intermediate joint (1) being connected to a bending limiter (2), the bending limiter (2) being bent within a limited angle range to limit the bending angle of the cable, a plurality of flushing and burying hard pipes (3) being provided on the outer ring of the intermediate joint (1), the flushing and burying hard pipes (3) being provided with hard pipe flushing and burying holes for flushing and ploughing seabed mud and sand, the plurality of flushing and burying hard pipes (3) being arranged parallel to the axial direction of the intermediate joint (1) and distributed on the circumference of the intermediate joint (1), a flushing and burying hose (4) being provided on both ends of each of the flushing and burying hard pipes (3), the flushing and burying hose (4) being provided with a hose flushing and burying hole for flushing and ploughing seabed mud and sand, the flushing and burying hose (4) being bent synchronously with the bending limiter (2).
2. According to claim 1, a submarine cable intermediate joint self-embedding structure is characterized by: A total of four flushing and burying rigid pipes (3) are provided. The four flushing and burying rigid pipes (3) are respectively arranged at four corners of the inclined diagonal line. The four flushing and burying rigid pipes (3) include two upper flushing and burying rigid pipes (3.1) arranged at the upper end and two lower flushing and burying rigid pipes (3.2) arranged at the lower end. The flushing and burying hoses (4) at both ends of the two upper flushing and burying rigid pipes (3.1) are upper flushing and burying hoses (4.1), and the flushing and burying hoses (4) at both ends of the two lower flushing and burying rigid pipes (3.2) are lower flushing and burying hoses (4.2).
3. According to claim 2, a submarine cable intermediate joint self-embedding structure is characterized by: The upper punched buried hard pipe (3.1) and the upper punched buried hose (4.1) are provided with four rows of upper punched buried holes (5). The four rows of upper punched buried holes (5) are respectively formed from the longitudinal symmetric surface of the middle joint (1) to the transverse symmetric surface of the middle joint (1) along the side away from the middle joint (1), namely, a canopy hole (5.1), an upper punched hole (5.2), an upper spreading hole (5.3) and an upper horizontal hole (5.4). The canopy hole (5.1) is arranged obliquely upward toward the longitudinal symmetric surface of the middle joint (1). The upper punch hole (5.2) is arranged at the top of the upper punch buried hard tube (3.1) and is arranged obliquely upward away from the longitudinal symmetric plane of the middle joint (1); the upper expansion hole (5.3) is arranged obliquely above the upper punch buried hard tube (3.1) and is arranged along the radial direction of the upper punch buried hard tube (3.1); the upper horizontal hole (5.4) is arranged along the horizontal radial direction of the upper punch buried hard tube (3.1); and the inclination angles of the upper punch hole (5.2), the upper expansion hole (5.3) and the upper horizontal hole (5.4) decrease in sequence.
4. According to claim 2, a submarine cable intermediate joint self-embedding structure is characterized by: The lower punched buried hard pipe (3.2) and the lower punched buried soft pipe (4.2) are provided with a total of five rows of lower punched buried holes (6). The five rows of lower punched buried holes (6) are respectively inner punched holes (6.1), lower inner punched holes (6.2), lower punched holes (6.3), lower outer punched holes (6.4) and outer punched holes (6.5) from the longitudinal symmetric surface of the middle joint (1) to the transverse symmetric surface of the middle joint (1) along the side away from the middle joint (1). The inner punched holes (6.1) are arranged obliquely downward toward the longitudinal symmetric surface of the middle joint (1), and the lower inner punched holes (6.2) are also arranged obliquely downward toward the middle joint (1). The inner punch (6.1) and the lower inner punch (6.2) are arranged on the longitudinal symmetric plane of the middle joint (1), and the extension line of the inner punch (6.1) and the extension line of the lower inner punch (6.2) intersect at the longitudinal symmetric plane of the middle joint (1); the lower punch (6.3) is arranged downward; the lower outer punch (6.4) is arranged obliquely downward away from the longitudinal symmetric plane of the middle joint (1); the outer punch (6.5) is arranged obliquely downward away from the longitudinal symmetric plane of the middle joint (1), and the extension line of the lower outer punch (6.4) and the extension line of the outer punch (6.5) intersect at the outer punch intersection point (6.6); and the distance between the outer punch intersection points (6.6) on both sides is greater than the width of the body.
5. According to claim 2, a submarine cable intermediate joint self-embedding structure is characterized in that: The four embedded hard pipes (3) are fixedly connected via a plurality of connecting pipes (7) arranged along the axial direction of the main body; both ends of the intermediate joint (1) are provided with limiting flanges (1.1); the connecting pipes (7) at both ends respectively abut against one side of the two limiting flanges (1.1) close to the center of the main body.
6. According to claim 2, a submarine cable intermediate joint self-embedding structure is characterized by: A water inlet pipe (8) is also connected between the four embedded rigid pipes (3), the water inlet pipe (8) is in communication with the four embedded rigid pipes (3), the water inlet pipe (8) is arranged at the center of the main body, and a water inlet (8.1) is arranged at the upper end of the water inlet pipe (8).
7. The self-embedding structure of the submarine cable intermediate joint according to claim 6, characterized in that: The water inlet (8.1) is connected to an underwater water pump (9) via a pipeline (10), and the length of the pipeline (10) is longer than the burial depth of the main body.
8. The self-embedding structure of the submarine cable intermediate joint according to claim 7, characterized in that: One end of the pipe (10) connected to the water inlet (8.1) is provided with an electrically controlled connecting clamp (11), and the electrically controlled connecting clamp (11) is used to fix or release the water inlet (8.1).
9. The self-embedding structure of the submarine cable intermediate joint according to claim 2, characterized in that: The four flushing hoses (4) are fixedly connected via a plurality of connecting rings (12) arranged along the axial direction of the bend limiter (2).
10. A method for burying a submarine cable intermediate joint self-buried structure, characterized in that: The method for completing the flushing operation of the self-buried structure of the submarine cable intermediate joint as described in any one of claims 1 to 9 comprises the following steps: S1: The middle joint (1) is suspended, and the bend limiter (2) droops naturally; S2: When the main body sinks close to the seabed and the bend limiter (2) remains in a naturally drooping state, the underwater pump (9) is turned on, the hard pipe flushing hole is used to plow the seabed directly below, and the soft pipe flushing hole is used to plow the connection between the middle joint (1) and the bend limiter (2); S3: the body continues to sink, and the bend limiter (2) abuts against the seabed; S4: the bend limiter (2) is straightened, and the intermediate joint (1) is sunk into the initial groove plowed out by the flushing hard pipe (3) and the flushing soft pipe (4); S5: The suspension of the middle joint (1) is released by an underwater robot or a diver, and only the connection between the underwater water pump (9) and the water inlet (8.1) is maintained; S6: using the simple hanging connection of the pipeline (10) and the plowing reaction force of the flushing hard pipe (3) to reduce the sinking speed, ensure that the flushing hard pipe (3) and the flushing hose (4) fully plow the surrounding area, so that the main body keeps sinking horizontally; S6: sinking to a specified depth, the electric control connection clamp (11) releases the connection with the water inlet (8.1); S7: Recover the underwater water pump (9) and the electric control connecting clamp (11).