Protection device for submarine cable burying plough inlet and implementation method of protection device

Abstract

The invention relates to the technical field of submarine cable installation auxiliary equipment, in particular to a protection device for an entrance of a submarine cable burying plough and an implementation method thereof.The protection device comprises a burying plough, a horn-shaped cable guide opening is fixed to the entrance of the upper end of the burying plough, and a plurality of installation frames are longitudinally arranged on the cable guide opening; a plurality of buffer rods are arranged on the inner circumferential side of the mounting frame, so that the submarine cable can extrude the buffer rods when swinging at the inlet of the burying plough, and the buffer effect is achieved; a guide shaft is fixed at one end, close to the mounting frame, of the buffer rod, penetrates through the mounting frame and extends out of the mounting frame, and a spring is arranged on the guide shaft; limiting rods are fixed to the ends, close to the mounting frame, of the buffering rods and penetrate through the mounting frame. The submarine cable can extrude the buffer rod when swinging at the inlet of the burying plough, so that the buffer effect is achieved, the position of the inlet of the burying plough has high safety, and the final submarine cable construction quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of submarine cable installation auxiliary equipment, in particular to a protection device for a submarine cable burying plow entrance and an implementation method thereof. Background Art

[0002] Submarine cables are the energy vessels of marine facilities. With the rapid development of offshore wind power in recent years, a large number of offshore wind power cables have been laid. At the same time, as the country gradually increases its development of offshore oil, a large number of submarine cables have been laid. Submarine cables are laid on the seabed, and changes in the seabed morphology have a great impact on the laying of submarine cables and the life of submarine cables. Since submarine cables are laid on the seabed for a long time, there is a risk of damage by fishing operations or falling objects on the water, so submarine cables need to be buried in the seabed to a certain depth. At present, the construction is carried out by using a buried plow, which can achieve laying and burying at the same time to improve work efficiency. However, when the submarine cable passes through the buried plow, it will be affected by the speed of the ship, swells, etc., and it will swing at the entrance of the buried plow. At the same time, the difference in the speed of the construction ship will also cause the submarine cable to accumulate at the entrance of the buried plow, causing potential damage risks. How to use the submarine cable to safely enter the buried plow and improve the construction quality is an urgent problem to be solved. Summary of the invention

[0003] The object of the present invention is to provide a protective device for the entrance of a submarine cable burying plow and an implementation method thereof, so that when the submarine cable swings at the entrance of the burying plow, the buffer rod can be squeezed, thereby playing a buffering role.

[0004] The present invention adopts the following technical solutions to achieve the above purpose:

[0005] A protective device for the entrance of a submarine cable burying plow comprises a burying plow, a trumpet-shaped cable guide opening is fixed at the entrance of the upper end of the burying plow, and a plurality of mounting frames are longitudinally arranged on the cable guide opening; a plurality of buffer rods are arranged on the inner circumference of the mounting frame, so that when the submarine cable swings at the entrance of the burying plow, the buffer rods can be squeezed, thereby playing a buffering role.

[0006] Preferably, a guide shaft is fixed to one end of the buffer rod close to the mounting frame, the guide shaft penetrates the mounting frame and extends outside the mounting frame, and a spring is arranged on the guide shaft.

[0007] Preferably, a limiting rod is fixed to one end of the buffer rod close to the mounting frame, the limiting rod penetrates the mounting frame, and a pressure sensor is installed on the limiting rod.

[0008] Preferably, the mounting frame comprises two U-shaped rods which are located opposite to each other, two connecting rods are arranged between the two U-shaped rods, and the connecting rods are connected to the vertical rods of the U-shaped rods via connecting sleeves.

[0009] Preferably, the embedding plow is arranged on a frame, and a sonar is fixed on the top of the frame via a bracket.

[0010] Preferably, the sonar has a sheath.

[0011] Preferably, the two legs on the same side of the frame are fixed on a sliding shoe.

[0012] A method for implementing a protective device for a submarine cable burying plow entrance, the method is as follows:

[0013] Step 1: After passing the submarine cable through the burying plow, the initial section is laid and installed. After entering the section to be buried, the burying plow is lowered for burying construction. When lowering, the burying plow is adjusted in real time according to the posture of the submarine cable at the entrance of the burying plow scanned by sonar, so that the submarine cable is always in a safe state until the sliding shoe is placed on the seabed;

[0014] Step 2: During the burying construction, the sliding shoe slides along the seabed so that the burying plow will not sink into the seabed. As the submarine cable passes through the cable guide port and enters the burying plow and is buried in the seabed, there is a buffer rod with a pressure sensor that can swing slightly inside each layer of the cable guide port. The buffer rods at different positions on different layers are compressed by the submarine cable and trigger the pressure sensor signal at this position, indicating the current posture of the submarine cable entering the entrance of the burying plow to the surface.

[0015] Step 3: Display the cable posture according to multiple pressure sensor signals. If the pressure sensor signal at the top of the cable guide is triggered, the cable entry posture is monitored in combination with the sonar scanning posture. If the pressure signal increases and the sonar scan finds that the cable is swinging out, the water surface slows down the cable lowering speed so that the cable returns to the center of the cable guide until the pressure sensor signals are not triggered.

[0016] Step 4: Lower the submarine cable in real time according to the pressure sensor signal to ensure that the submarine cable passes through the burying plow safely from the submarine cable mouth to complete the burying construction; then stop burying, lift the burying plow to recover it, and adjust it to make the submarine cable in the center of the cable guide mouth according to the real-time sonar detection, and recover the burying plow to the deck of the construction ship to complete the burying construction. Then carry out the stern boarding construction, connect the power, test, etc., and the submarine cable construction is completed.

[0017] Beneficial effects of the present invention:

[0018] (1) In the present invention, an embodiment is provided, in which a trumpet-shaped cable guide is fixed at the entrance of the upper end of the burying plow, which can guide the submarine cable so that the submarine cable can smoothly enter the burying plow from the entrance of the burying plow. A plurality of buffer rods are arranged on the inner circumference of the mounting frame, so that when the submarine cable swings at the entrance of the burying plow, the buffer rods can be squeezed, thereby playing a buffering role.

[0019] (2) In one embodiment of the present invention, when the submarine cable squeezes the buffer rod, it drives the limit rod to slide, thereby driving the pressure sensor to move toward the installation frame. When the pressure sensor touches the installation frame, it sends a signal, allowing the staff to adjust the cable release.

[0020] (3) In one embodiment of the present invention, the connecting sleeve can facilitate the disassembly and assembly of the connecting rod to meet the needs of side removal operations during submarine cable construction.

[0021] The present invention enables the submarine cable to squeeze the buffer rod when it swings at the entrance of the burying plough, thereby playing a buffering role. The entrance position of the burying plough has higher safety, ensuring the final submarine cable construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 It is a front view schematic diagram of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the fairlead.

[0025] In the figure: burying plow 1, cable guide 2, mounting frame 21, buffer rod 22, guide shaft 23, spring 24, limit rod 25, pressure sensor 26, U-shaped rod 211, connecting rod 212, connecting sleeve 213, frame 3, bracket 4, sonar 5, sheath 6, and sliding shoe 7. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] like Figures 1 to 3 As shown, an embodiment of the present invention is provided, which provides a protective device for the entrance of a submarine cable burying plow, comprising a burying plow 1, a trumpet-shaped cable guide 2 is fixed at the entrance of the upper end of the burying plow 1, which can guide the submarine cable so that the submarine cable can smoothly enter the burying plow 1 from the entrance of the burying plow 1. The cable guide 2 is longitudinally provided with a plurality of mounting frames 21; the inner circumference of the mounting frame 21 is provided with a plurality of buffer rods 22, so that when the submarine cable swings at the entrance of the burying plow 1, the buffer rods 22 can be squeezed, thereby playing a buffering role.

[0028] A guide shaft 23 is fixed to one end of the buffer rod 22 close to the mounting frame 21. The guide shaft 23 penetrates the mounting frame 21 and extends outside the mounting frame 21. A first through hole (not shown) for the guide shaft 23 to slide is provided on the mounting frame 21, so that when the submarine cable squeezes the buffer rod 22, the guide shaft 23 can slide in the first through hole. A spring 24 is provided on the guide shaft 23, one end of the spring 24 is connected to the buffer rod 22, and the other end is connected to the mounting frame 21. The spring 24 can play a buffering role when the submarine cable squeezes the buffer rod 22.

[0029] In one embodiment of the invention, this embodiment is based on the previous embodiment, and a limiting rod 25 is fixed to one end of the buffer rod 22 close to the mounting frame 21, and the limiting rod 25 penetrates the mounting frame 21. A second through hole (not shown) for the limiting rod 25 to pass through is opened on the mounting frame 21, so that when the submarine cable squeezes the buffer rod 22, the limiting rod 25 can slide in the second through hole; a pressure sensor 26 is installed on the limiting rod 25, and when the submarine cable squeezes the buffer rod 22, the limiting rod 25 is driven to slide, thereby driving the pressure sensor 26 to move toward the mounting frame 21, and when the pressure sensor 26 touches the mounting frame 21, a signal is sent out, allowing the staff to adjust the cable release.

[0030] In one embodiment of the invention, which is based on any one of the above embodiments, the installation frame 21 includes two U-shaped rods 211 in opposite positions, and two connecting rods 212 are arranged between the two U-shaped rods 211. The connecting rods 212 are connected to the vertical rods of the U-shaped rods 211 via connecting sleeves 213. The connecting sleeves 213 can facilitate the disassembly and assembly of the connecting rods 212 to meet the needs of side removal operations during submarine cable construction.

[0031] The inner wall of the connecting sleeve 213 has an internal thread, and the connecting rod 212 and the vertical rod of the U-shaped rod 211 are both provided with external threads matching the internal threads, so that the connecting rod 212 can be disassembled and assembled by rotating the connecting sleeve 213.

[0032] In one embodiment of the invention, which is based on any one of the above embodiments, the burying plow 1 is arranged on a frame 3, and a sonar 5 is fixed on the top of the frame 3 through a bracket 4. The sonar 5 is an underwater sonar 5, which detects the deviation between the submarine cable at the entrance position of the burying plow 1 and the installation frame 21 through sound wave reflection, guides the construction ship to adjust the cable, and prevents the submarine cable from accumulating at the entrance of the burying plow 1 and causing it to break.

[0033] In one embodiment of the invention, which is based on any one of the above embodiments, the sonar 5 has a sheath 6 for protecting the sonar 5 .

[0034] In one embodiment of the invention, which is based on any of the above embodiments, the two legs on the same side of the frame 3 are fixed on a sliding shoe 7, and the sliding shoe 7 can slide along the seabed so that the burying plow 1 will not sink into the seabed.

[0035] In one embodiment of the present invention, this embodiment is based on any of the above embodiments, and this embodiment provides an implementation method of a protection device for a submarine cable burying plow entrance, the method is as follows:

[0036] Step 1: After passing the submarine cable through the burying plow, the initial section is laid and installed. After entering the section to be buried, the burying plow is lowered for burying construction. When lowering, the burying plow is adjusted in real time according to the posture of the submarine cable at the entrance of the burying plow scanned by sonar, so that the submarine cable is always in a safe state until the sliding shoe is placed on the seabed;

[0037] Step 2: During the burying construction, the sliding shoe slides along the seabed so that the burying plow will not sink into the seabed. As the submarine cable passes through the cable guide port and enters the burying plow and is buried in the seabed, there is a buffer rod with a pressure sensor that can swing slightly inside each layer of the cable guide port. The buffer rods at different positions on different layers are compressed by the submarine cable and trigger the pressure sensor signal at this position, indicating the current posture of the submarine cable entering the entrance of the burying plow to the surface.

[0038] Step 3: Display the cable posture according to multiple pressure sensor signals. If the pressure sensor signal at the top of the cable guide is triggered, the cable entry posture is monitored in combination with the sonar scanning posture. If the pressure signal increases and the sonar scan finds that the cable is swinging out, the water surface slows down the cable lowering speed so that the cable returns to the center of the cable guide until the pressure sensor signals are not triggered.

[0039] Step 4: Lower the submarine cable in real time according to the pressure sensor signal to ensure that the submarine cable passes through the burying plow safely from the submarine cable mouth to complete the burying construction; then stop burying, lift the burying plow to recover it, and adjust it to make the submarine cable in the center of the cable guide mouth according to the real-time sonar detection, and recover the burying plow to the deck of the construction ship to complete the burying construction. Then carry out the stern boarding construction, connect the power, test, etc., and the submarine cable construction is completed.

[0040] The pressure sensor and underwater sonar in the present invention are both prior arts, which are clearly understood by those skilled in the art and will not be described in detail here.

[0041] The above description is only a preferred embodiment of the present invention and should not be construed as limiting 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 protective device for the entrance of a submarine cable burying plow, comprising a burying plow, characterized in that: A trumpet-shaped cable guide is fixed at the entrance of the upper end of the burying plow, and a plurality of mounting frames are longitudinally arranged on the cable guide; a plurality of buffer rods are arranged on the inner circumference of the mounting frame, so that the buffer rods can be squeezed when the submarine cable swings at the entrance of the burying plow, thereby playing a buffering role; A guide shaft is fixed to one end of the buffer rod close to the mounting frame, the guide shaft penetrates the mounting frame and extends outside the mounting frame, and a spring is arranged on the guide shaft; A limit rod is fixed to one end of the buffer rod close to the mounting frame, the limit rod penetrates the mounting frame, and a pressure sensor is installed on the limit rod; The installation frame comprises two U-shaped rods which are located opposite to each other. Two connecting rods are arranged between the two U-shaped rods. The connecting rods are connected to the vertical rods of the U-shaped rods via connecting sleeves.

2. A protective device for the entrance of a submarine cable burying plow according to claim 1, characterized in that: The embedding plow is arranged on a frame, and a sonar is fixed on the top of the frame via a bracket.

3. A protective device for the entrance of a submarine cable burying plow according to claim 2, characterized in that: The sonar has a sheath.

4. A protective device for the entrance of a submarine cable burying plow according to claim 2 or 3, characterized in that: Two legs on the same side of the frame are fixed on a sliding shoe.

5. A method for implementing the protective device for the entrance of a submarine cable burying plow according to claim 4, characterized in that: Here’s how: Step 1: After passing the submarine cable through the burying plow, the initial section is laid and installed. After entering the section to be buried, the burying plow is lowered for burying construction. When lowering, the burying plow is adjusted in real time according to the posture of the submarine cable at the entrance of the burying plow scanned by sonar, so that the submarine cable is always in a safe state until the sliding shoe is placed on the seabed; Step 2: During the burying construction, the sliding shoe slides along the seabed so that the burying plow will not sink into the seabed. As the submarine cable passes through the cable guide port and enters the burying plow and is buried in the seabed, there is a buffer rod with a pressure sensor that can swing slightly inside each layer of the cable guide port. The buffer rods at different positions on different layers are compressed by the submarine cable and trigger the pressure sensor signal at this position, indicating the current posture of the submarine cable entering the entrance of the burying plow to the surface. Step 3: Display the cable posture according to multiple pressure sensor signals. If the pressure sensor signal at the top of the cable guide is triggered, the cable entry posture is monitored in combination with the sonar scanning posture. If the pressure signal increases and the sonar scan finds that the cable is swinging out, the water surface slows down the cable lowering speed so that the cable returns to the center of the cable guide until the pressure sensor signals are not triggered. Step 4: Lower the submarine cable in real time according to the pressure sensor signal to ensure that the submarine cable passes through the burying plow safely from the submarine cable mouth to complete the burying construction; then stop burying, lift the burying plow to recover it, and adjust it to make the submarine cable in the center of the cable guide mouth according to the real-time sonar detection, and recover the burying plow to the deck of the construction ship to complete the burying construction. Then carry out the stern boarding construction, connect the power, and test, and the submarine cable construction is completed.

Images