Submarine cable arc-shaped laying method

Abstract

The invention relates to the field of submarine cable construction, and particularly discloses a submarine cable arc-shaped laying method, which comprises the following steps of S1, inputting information by a system, and inputting the shape, the size, the longitude and the latitude of a submarine cable to be constructed in the system of a workboat; s2, calibration: calibrating the position information and the shape information input by the system; s3, setting an anchor point, fixing an anchor at the end part of the submarine cable at the initial point position of submarine cable laying, and putting the anchor point to the seabed; s4, submarine cables are laid, the workboat sails along the information input by the system, and the submarine cables are gradually laid to the seabed; and S5, ending, and after the submarine cable is laid to the final position, continuing to lay the submarine cable according to the designed route or cutting off the submarine cable according to requirements and putting the submarine cable into the seabed. According to the method, when submarine cables with arc requirements are laid, the construction precision can be effectively improved.

Description

Technical Field

[0001] The present application relates to the field of submarine cable construction, and in particular to a method for arc-shaped laying of submarine cables. Background Art

[0002] Submarine cables, or submarine cables, are cables used to transmit electrical energy and communication signals underwater. They connect continents, islands or submarine facilities for power transmission and data communication. Submarine cables are divided into communication cables and power cables. The former are mainly responsible for data transmission, while the latter are used for high-power power transmission. With the development of marine resources and global energy transformation, the demand for submarine cables in offshore wind power, transnational power grids and other fields is growing, and its technological development and market size are also expanding.

[0003] In the related art, when laying submarine cables, a construction ship is usually used to carry cables to the sea area to be constructed. The construction ship lays the submarine cable along the route of the submarine cable to be laid. One end of the submarine cable will be dropped to the seabed first, and then the construction ship sails along the route and gradually lays the submarine cable to the seabed. When laying a submarine cable with a straight track, the construction ship only needs to travel in a straight line, but when laying a submarine cable with an arc track, due to the distance between the construction ship and the seabed, the submarine cable has a large deviation when laid in an arc shape. To this end, the applicant provides a method for laying an arc-shaped submarine cable. Summary of the invention

[0004] In order to improve the accuracy of arc-shaped submarine cable construction, the present application provides an arc-shaped submarine cable laying method.

[0005] The present application provides a method for laying a submarine cable in an arc shape, which adopts the following technical solution: A method for laying a submarine cable in an arc shape, comprising the following steps: S1. Input information into the system. Enter the shape, size, longitude and latitude of the submarine cable to be constructed into the system of the construction ship. S2, calibration, calibrating the position information and shape information entered by the system; S3. Setting up anchor points: fixing anchors at the end of the submarine cable at the starting point of the submarine cable laying and dropping them to the seabed; S4: Laying the submarine cable. The construction ship sails according to the information entered by the system and gradually lays the submarine cable to the seabed. S5. Finishing: After being laid to the final destination, the submarine cable will continue to be laid according to the designed route or the submarine cable will be cut and thrown into the seabed as required.

[0006] By adopting the above technical solution, when constructing a curved submarine cable, it is necessary to locate and calibrate the position of the submarine cable, which can effectively improve the laying accuracy of the curved submarine cable.

[0007] Optionally, in step S2, when calibrating the information entered into the system, it is necessary to launch an ROV robot into the sea from the construction ship and drive the ROV robot to swim along the route of the cable laying; the ROV robot is equipped with a beacon, which transmits the signal to the construction ship, and then compares it with the information entered into the system of the construction ship to see if there is an error between the two; if there is a large error, the construction ship will make corrections based on the information sent back by the beacon; if the error is within the allowable range, the construction ship will carry out construction according to the route input by the system.

[0008] By adopting the above technical solution, the ROV robot is used to swim along the line corresponding to the construction position on the seabed, and then the information is transmitted back through the beacon of the ROV robot. The information is compared and calibrated with the information pre-entered into the construction ship, which can effectively improve the laying accuracy of the submarine cable.

[0009] Optionally, in step S3, after the submarine cable is dropped onto the seabed, it is necessary to control the ROV robot to swim to the submarine cable location and transmit a signal back through a beacon to determine whether the starting position of the submarine cable is accurate; if there is a large deviation, the construction ship is controlled to move and adjust the position; if the deviation is within the allowable range, construction continues.

[0010] By adopting the above technical solution, the construction accuracy can be effectively improved by positioning the starting point of the submarine cable laying through ROV robots and beacons.

[0011] Optionally, before dropping the submarine cable to the seabed, a reference object, such as a brightly colored object such as a ribbon, needs to be fixed at the end of the submarine cable for easy identification by the ROV robot.

[0012] By adopting the above technical solution, a brightly colored reference object is fixed at the end of the submarine cable, making it easier for the ROV robot to find the target on the seabed.

[0013] Optionally, during construction in step S3, the construction vessel is required to sail along the tangent of the arc contour.

[0014] By adopting the above technical solution, if the submarine cable is arranged according to the arc route of construction, the position of the submarine cable will always be biased towards the inside of the arc, and the submarine cable can be arranged on the specified route only by sailing along the tangent.

[0015] Optionally, during construction in step S3, it is necessary to calculate the position of the submarine cable on the seabed; the lowered submarine cable and the contact point with the seabed, the construction ship, and the position of the vertical projection of the construction ship to the seabed form a right triangle, the distance between the contact point of the lowered submarine cable with the seabed and the construction ship is a, the distance between the construction ship and the projection point of the construction ship on the seabed, that is, the seawater depth is b, the distance between the projection point of the construction ship on the seabed and the contact point of the lowered submarine cable with the seabed is c, and the angle between a and b is ß, a can be obtained by calculating the length of the submarine cable released, b is the seawater depth, and c can be calculated by controlling the angle ß, thereby determining the position of the submarine cable on the seabed and achieving accurate deployment of the submarine cable.

[0016] By adopting the above technical solution, using the right triangle formed by the construction ship, the position of the submarine cable on the seabed and the point of the vertical projection of the construction ship on the seabed, the position of the submarine cable on the seabed can be calculated by controlling the angle ß, thereby effectively improving the laying accuracy of the submarine cable.

[0017] Optionally, the angle ß can be between 10° and 30°.

[0018] By adopting the above technical solution, due to the weight of the submarine cable itself, when laying the submarine cable, a is actually an arc close to a straight line, and the submarine cable will bend downward. The larger the angle ß, the more severe the bending of the submarine cable, resulting in a greater deviation in the calculated submarine cable position. Controlling the angle ß between 10° and 30° can effectively control the error range and improve the accuracy of submarine cable laying.

[0019] Optionally, after each distance the submarine cable is laid, an ROV robot is required to swim to the location of the submarine cable and transmit a signal back through a beacon to detect whether the submarine cable laying position meets the standard. If the deviation is large, the construction ship needs to move to adjust the submarine cable position. If the submarine cable position is accurate, construction will continue.

[0020] By adopting the above technical solution, after the submarine cable is laid for a certain distance, the ROV robot is used to calibrate it, which can effectively control the accuracy.

[0021] Optionally, in step S5, after the length of the submarine cable reaches the construction length, the submarine cable is cut on the construction ship, and then a steel wire is tied to the end of the submarine cable. The submarine cable is laid to the designated position through the steel wire, and then the ROV robot swims to the submarine cable position, and after the beacon sends back information and adjusts the submarine cable into place, the ROV robot cuts the steel wire to complete the submarine cable laying work.

[0022] By adopting the above technical solution, the end of the submarine cable can be accurately placed in place.

[0023] Optionally, the construction vessel adopts a DP vessel, that is, a dynamically positioned vessel.

[0024] By adopting the above technical solution, the positioning accuracy of the DP ship is higher, which can improve the accuracy of submarine cable laying.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. By entering the shape of the submarine cable in the system, calibrating it, setting anchor points, laying the submarine cable, and finally finishing it, the accuracy of laying the curved submarine cable can be effectively improved; 2. The ROV robot walks along the line corresponding to the construction location on the seabed, and then transmits the information back through the beacon of the ROV robot, and compares and calibrates it with the information previously entered into the construction ship, which can effectively improve the laying accuracy of the submarine cable; 3. Through the right triangle formed by the construction ship, the position of the submarine cable on the seabed and the point of the vertical projection of the construction ship on the seabed, the position of the submarine cable on the seabed can be calculated by controlling the angle ß, thereby effectively improving the laying accuracy of the submarine cable; 4. Due to the weight of the submarine cable itself, when laying the submarine cable, a is actually an arc close to a straight line, and the submarine cable will bend downward. The larger the angle ß, the more severe the bending of the submarine cable, resulting in a greater deviation in the calculated submarine cable position. Controlling the angle ß between 10° and 30° can effectively control the error range and improve the accuracy of submarine cable laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a construction step diagram of an embodiment of the present application; Figure 2 It is a schematic diagram of laying a submarine cable by a construction vessel in an embodiment of the present application; Figure 3 It is a schematic diagram of a construction vessel sailing tangentially along an arc trajectory in an embodiment of the present application.

[0027] Figure numerals: 1. arc track; 2. submarine cable; 3. construction vessel; 4. ROV robot; 5. anchor; 6. reference object. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-3 This application is described in further detail.

[0029] The present application discloses a method for laying a submarine cable in an arc shape. Figure 1 , including the following steps: S1. System input information. The shape, size, longitude and latitude of the submarine cable 2 to be constructed are input into the system of the construction ship 3. In this application, the construction ship 3 is a DP ship, that is, a dynamic positioning ship, which has higher positioning accuracy.

[0030] S2, calibration, calibrate the position information and shape information entered into the system. During calibration, it is necessary to launch the ROV robot 4 from the construction ship 3 into the sea, and then control the ROV robot 4 to swim along the route where the submarine cable 2 needs to be laid; the ROV robot 4 is equipped with a beacon, which will transmit the position signal to the construction ship 3 in real time, and then the staff can compare the signal sent back by the ROV robot 4 with the signal entered in advance by the system to check whether there is a deviation between the two data; if the deviation is within the allowable range, the construction ship 3 will carry out construction according to the route entered; if the deviation exceeds the allowable range, the information entered in the system needs to be corrected before construction can be carried out.

[0031] Reference Figure 2 and Figure 3 S3, anchor 5 is set, at the starting point of laying the submarine cable 2, anchor 5 is fixed at the end of the submarine cable 2, and the submarine cable 2 and anchor 5 are dropped to the seabed. Before dropping the submarine cable 2 to the seabed, a reference object 6, such as a brightly colored object such as a ribbon, is fixed at the end of the submarine cable 2 to facilitate the ROV robot 4 to find the target in the following steps.

[0032] After the submarine cable 2 and anchor 5 are dropped onto the seabed, the ROV robot 4 is controlled to swim to the end of the submarine cable 2 and place a beacon at the end of the submarine cable 2. The signal is then transmitted back through the beacon to determine whether the starting position of the submarine cable 2 is accurate. If there is a large deviation, the construction ship 3 is controlled to move and adjust the position. If the deviation is within the allowable range, construction continues.

[0033] S4. Laying the submarine cable 2. The construction vessel 3 sails according to the information entered into the system and gradually lays the submarine cable 2 to the seabed.

[0034] When laying the submarine cable 2, the construction ship 3 needs to sail along the tangent of the arc track 11 of the submarine cable 2. During the laying of the submarine cable 2, the submarine cable 2 between the construction ship 3 and the seabed is always at a certain angle, and the submarine cable 2 cannot be lowered vertically. Therefore, the landing point of the submarine cable 2 is always behind the construction ship 3. Therefore, the construction ship 3 sails along the tangent direction of the arc track 11 to drop the submarine cable 2 to the set position.

[0035] Reference Figure 3In the process of laying the submarine cable 2, the position of the submarine cable 2 on the seabed needs to be calculated by the system to improve the laying accuracy of the submarine cable 2. The calculation method is to form a right triangle through the contact point of the lowered submarine cable 2 with the seabed, the construction ship 3, and the position of the vertical projection of the construction ship 3 to the seabed. The distance between the contact point of the lowered submarine cable 2 with the seabed and the construction ship 3 is a, the distance between the construction ship 3 and the projection point of the construction ship 3 on the seabed is b, the distance between the projection point of the construction ship 3 on the seabed and the contact point of the lowered submarine cable 2 with the seabed is c, and the angle between a and b is ß. a can be obtained by calculating the length of the submarine cable 2 released, b is the depth of the seawater, and the angle ß can also be measured by the equipment on the construction ship 3. If a, b and the angle ß are all known, c can be calculated, thereby calculating the position of the contact point of the lowered submarine cable 2 with the seabed, thereby realizing the accurate laying of the submarine cable 2. In addition, by controlling the angle ß, the position of the contact point of the lowered submarine cable 2 with the seabed can be controlled, which facilitates the laying of the submarine cable 2.

[0036] Due to the weight of the submarine cable 2, when laying the submarine cable 2, a is actually an arc close to a straight line, and the submarine cable 2 will bend downward. The larger the angle ß, the more severe the bending of the submarine cable 2, resulting in a greater deviation in the calculated position of the submarine cable 2. Controlling the value range of the angle ß between 10° and 30° can effectively reduce the error range, thereby improving the laying accuracy of the submarine cable 2.

[0037] After each distance that the submarine cable 2 is laid, it is necessary to control the ROV robot 4 to swim to the position of the submarine cable 2, transmit the signal back through the beacon, and detect whether the laying position of the submarine cable 2 meets the standard; if the position of the submarine cable 2 is accurate, construction will continue; if the deviation is large, the construction ship 3 needs to move its position and drag the submarine cable 2 to adjust the position of the submarine cable 2 on the seabed until the position of the submarine cable 2 is adjusted to within the error range, and then continue construction.

[0038] S5, finishing, after being laid to the terminal position, the submarine cable 2 will continue to be laid according to the designed route or cut and put into the seabed according to requirements. After the length of the submarine cable 2 reaches the construction length, the submarine cable 2 is cut on the construction ship 3, and then a steel wire is tied to the end of the submarine cable 2, and the submarine cable 2 is laid to the designated position through the steel wire, and then the ROV robot 4 is controlled to swim to the position of the submarine cable 2, and the information is sent back through the beacon. Then, the construction ship 3 adjusts the submarine cable 2 into place according to the information sent back by the beacon, and then controls the ROV robot 4 to cut the steel wire to complete the laying of the submarine cable 2.

[0039] By following the above steps, the accuracy error of submarine cable laying can be controlled within 1 meter when the water depth exceeds 500 meters.

[0040] The implementation principle of the arc-shaped laying method of a submarine cable disclosed in an embodiment of the present application is as follows: when laying the submarine cable 2, the construction vessel 3 travels along the tangent of the arc-shaped trajectory 1 of the laying of the submarine cable 2, and then uses formula technology to calculate the position of the lowered submarine cable 2 on the seabed, and then verifies it through the ROV robot 4. Through multiple precise calculations and verification and adjustment of the ROV robot 4, the laying accuracy of the submarine cable 2 can be effectively improved.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for laying a submarine cable in an arc shape, characterized in that: The following steps are involved: S1. Input information into the system. Enter the shape, size, longitude and latitude of the submarine cable to be constructed into the system of the construction ship. S2, calibration, calibrating the position information and shape information entered by the system; S3. Setting up anchor points: fixing anchors at the end of the submarine cable at the starting point of the submarine cable laying and dropping them to the seabed; S4: Laying the submarine cable. The construction ship sails according to the information entered by the system and gradually lays the submarine cable to the seabed. S5. Finishing: After being laid to the final destination, the submarine cable will continue to be laid according to the designed route or the submarine cable will be cut and thrown into the seabed as required.

2. A method for laying a submarine cable in an arc shape according to claim 1, characterized in that: In step S2, when calibrating the information entered into the system, it is necessary to launch an ROV robot into the sea from the construction ship and drive the ROV robot to swim along the route of the cable laying; the ROV robot is equipped with a beacon, which will transmit the signal to the construction ship, and then compare it with the information entered into the system of the construction ship to see if there is any error between the two; if there is a large error, the construction ship will make corrections based on the information sent back by the beacon; if the error is within the allowable range, the construction ship will carry out construction according to the route input by the system.

3. The method for laying a submarine cable in an arc shape according to claim 1, characterized in that: In step S3, after the submarine cable is dropped onto the seabed, the ROV needs to be controlled to swim to the location of the submarine cable and transmit a signal back through the beacon to determine whether the starting position of the submarine cable is accurate; if there is a large deviation, the construction ship is controlled to move and adjust the position; if the deviation is within the allowable range, construction continues.

4. A method for laying a submarine cable in an arc shape according to claim 3, characterized in that: Before dropping the submarine cable to the seabed, a reference object, such as a brightly colored object like a ribbon, needs to be fixed at the end of the cable for easy identification by the ROV robot.

5. The method for laying a submarine cable in an arc shape according to claim 1, characterized in that: During construction in step S3, the construction vessel needs to sail along the tangent line of the arc contour.

6. A method for laying a submarine cable in an arc shape according to claim 5, characterized in that: During construction in step S3, it is necessary to calculate the position of the submarine cable on the seabed; the lowered submarine cable and the contact point with the seabed, the construction ship and the position of the vertical projection of the construction ship to the seabed form a right triangle, the distance between the contact point of the lowered submarine cable with the seabed and the construction ship is a, the distance between the construction ship and the projection point of the construction ship on the seabed, that is, the seawater depth is b, the distance between the projection point of the construction ship on the seabed and the contact point of the lowered submarine cable with the seabed is c, the angle between a and b is ß, a can be obtained by calculating the length of the submarine cable released, b is the seawater depth, and c can be calculated by controlling the angle ß, thereby determining the position of the submarine cable on the seabed and achieving accurate deployment of the submarine cable.

7. A method for laying a submarine cable in an arc shape according to claim 6, characterized in that: The angle ß is between 10° and 30°.

8. The method for laying a submarine cable in an arc shape according to claim 6, characterized in that: After the submarine cable is laid for a certain distance, an ROV robot is required to swim to the location of the submarine cable and transmit the signal back through the beacon to detect whether the submarine cable laying position meets the standard. If the deviation is large, the construction ship needs to move to adjust the submarine cable position. If the submarine cable position is accurate, construction will continue.

9. The method for laying a submarine cable in an arc shape according to claim 1, characterized in that: In step S5, after the length of the submarine cable reaches the construction length, the submarine cable is cut on the construction ship, and then a steel wire is tied to the end of the submarine cable. The submarine cable is laid to the designated position through the steel wire, and then the ROV robot swims to the submarine cable position, and the beacon sends back information. After the submarine cable is adjusted into place, the ROV robot cuts the steel wire to complete the submarine cable laying work.

10. The method for laying a submarine cable in an arc shape according to claim 1, characterized in that: The construction vessel is a DP ship, that is, a dynamically positioned vessel.

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