CN115473174A - Fishing repair and playback construction method for large-section oil-filled submarine cable in deep water area - Google Patents
Fishing repair and playback construction method for large-section oil-filled submarine cable in deep water area Download PDFInfo
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- CN115473174A CN115473174A CN202211041296.2A CN202211041296A CN115473174A CN 115473174 A CN115473174 A CN 115473174A CN 202211041296 A CN202211041296 A CN 202211041296A CN 115473174 A CN115473174 A CN 115473174A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
- B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
- B63C7/02—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects in which the lifting is done by hauling
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- Ocean & Marine Engineering (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
The invention discloses a construction method for salvaging, repairing and replaying a large-section oil-filled submarine cable in a deep water area, which comprises the following steps: s1, cleaning a covering on a submarine cable around a submarine cable fault point to fully expose the submarine cable on a seabed; s2, cutting off a submarine cable fault point on the seabed, and then fishing out the submarine cable at the fault section; s3, salvaging one of the remaining sea cables after cutting, partially cutting the cut end of the sea cable again, testing, plugging and hanging a buoy after cutting, and floating the sea cable on water; s4, salvaging the other sea cable left after cutting, partially cutting and testing the cut end of the sea cable again, and connecting a spare pipe cable matched with the cut end of the sea cable; s5, fishing the submarine cable with the tag in the step S3, connecting the submarine cable with the spare pipe cable in the step S4, and testing; s6, slowly putting the repaired submarine cable into water, and carrying out flush protection along the laying and playback path. The method has remarkable economic and social benefits.
Description
Technical Field
The invention relates to the field of ocean engineering, in particular to a salvaging, repairing and replaying construction method for a large-section oil-filled submarine cable in a deep water area.
Background
Submarine cables are an important major component in cross-sea power transportation projects. The oil-filled submarine cable is one of the common submarine cable types, and has high utilization rate in the existing cross-sea power transmission project. The large-section oil-filled submarine cable mainly comprises an outer sheath, an armor layer, an insulating layer, a conductor, an oil duct and the like, and more internal units contain easily damaged elements of the lead sheath. During the operation of big cross-section oil charge sea cable on the throne, can receive unexpected loads such as complicated wave current load and hull anchor, its structure and mechanical properties can take place to destroy, and then influence its transmission capacity, cause huge economic loss, meanwhile, the leakage of its inside insulating oil also can lead to the marine pollution phenomenon, consequently requires the sea cable to salvage the engineering and must accomplish quick response. After the submarine cable fault occurs, operations such as diagnosis, fault location, maintenance and reset need to be performed, the consumed time is long, great influence is caused to the use of the submarine cable, and the safety and the high efficiency are the main requirements of the deep sea large-section flexible pipe cable rush-repair construction. As one of the most central steps in the submarine cable emergency repair project, the salvage and playback construction of submarine cables should be paid attention. In the process of fishing and replaying the submarine cable, the submarine cable is subjected to more working conditions and complex load form, and secondary damage is easy to occur under the condition of lacking of standardized process guidance, so that the maintenance cost is further increased, and the maintenance time is prolonged.
The current relevant research to the big cross-section oil charge cable of deep water district salvages the playback process construction is less, and the deep water district sea cable salvages the maintenance operating mode complicacy, and marine environment is abominable, in case the misoperation will produce the secondary to the cable and destroy, great increase maintenance cost, in addition, salvage the playback process cable atress complicacy, is difficult to confirm concrete construction flow. The construction technology for salvaging and recovering the submarine cable still lacks the technical guidance of a unified and standardized construction process and key process links. Therefore, the invention is necessary to invent a construction process for salvaging and replaying the large-section oil-filled submarine cable in the deep water area, refine key processes and important steps of salvaging and replaying, and guide the construction process of salvaging and replaying workers.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a deepwater zone large-section oil-filled submarine cable salvage repair and playback construction method, which is characterized in that main parameter indexes and construction process flows are determined by analyzing different environments and stages in the deepwater zone large-section oil-filled cable salvage playback construction process, some losses indicate the process flows and parameters of the whole deepwater zone large-section oil-filled cable salvage playback construction, the construction is standardized, the construction safety is improved, the construction mode is eliminated from being non-uniform, and the construction method has remarkable economic and social benefits.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a deep water area large-section oil-filled submarine cable salvage repair and playback construction method comprises the following steps:
s1, cleaning a covering on a submarine cable around a submarine cable fault point to fully expose the submarine cable on a seabed;
s2, cutting off a submarine cable fault point on the seabed, and then fishing out the submarine cable at the fault section;
s3, salvaging one of the remaining sea cables after cutting, partially cutting off the cut end of the sea cable again, testing, plugging and hanging a buoy after cutting off, and floating the sea cable on water;
s4, salvaging the other sea cable left after cutting, partially cutting and testing the cut end of the sea cable again, and connecting a spare pipe cable matched with the cut end of the sea cable;
s5, fishing the submarine cable with the hung targets in the step S3, connecting the submarine cable with the spare pipe cable in the step S4, and performing sealing test;
and S6, slowly putting the repaired submarine cable into water, and carrying out flush protection along the laying and playback path.
Preferably, key steps and detailed processes in the fishing and playback process need to be parameterized and determined, and the specific steps are as follows:
simulating and simulating the fishing and playback process of the submarine cable by simulation software, and extracting key stress points, tension and curvature of the submarine cable;
judging the structural safety of the submarine cable in the construction process according to the mechanical properties of the submarine cable;
and (5) adjusting parameters, seeking a proper salvaging scheme and setting the parameters.
Further preferably, the steps of extracting the key stress point, the tension and the curvature of the submarine cable through simulation software are as follows:
establishing a parameter input model in simulation software, and inputting basic setting parameters, environment setting parameters, salvage ship setting parameters, submarine cable setting parameters, cable setting parameters and winch setting parameters in the parameter input model;
establishing a parameter adjusting model in simulation software, and adjusting the relation among parameters by adopting the parameter adjusting model to ensure the continuity of the parameter connection points;
and establishing a data generation model in simulation software, and calculating by adopting the data generation model according to the adjusted parameters to obtain the stress data of each position of the submarine cable.
Still further preferably, the basic setting parameters include an analysis step and an analysis time.
Still further preferably, the environmental setting parameters include ocean current flow velocity, wave parameters, seafloor topography, and seafloor soil parameters.
Still further preferably, the fishing vessel setting parameters include a fishing vessel size, a fishing vessel initial position, and a fishing vessel moving speed.
Still further preferably, the submarine cable setting parameters include submarine cable length, unit length, submarine cable mechanical properties and fixed point location.
Still further preferably, the cable setting parameters include a cable fishing speed and a cable state.
Still further preferably, the winch setting parameters include a winch shape and a winch position.
Still further preferably, the simulation software comprises Orcaflex software.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention enriches the construction process of the salvage and playback part of the deepwater submarine cable in the field of domestic emergency repair engineering. The method has the advantages that parameterization processing is carried out on actual working conditions, the original complex submarine cable salvage and playback process is abstracted into the linear problem of the submarine cable, the stress of the complex submarine cable is decoupled, and the safety of the submarine cable in the salvage and playback process is evaluated from different angles such as stretching and bending.
And determining technological parameters in construction in the salvaging and replaying of the deepwater submarine cable by utilizing numerical calculation software. And simulating the fishing and playback process of the submarine cable by using orcaflex numerical analysis software, and determining key process parameters and key stress positions of the submarine cable in the fishing and playback construction process. The influence of each parameter on the key stress position is further explored, so that a salvage playback construction scheme which is practical in fitting engineering and meets the project safety requirement is obtained.
Drawings
FIG. 1 is a first drawing of an overall model of a deep water salvage constructed by the present invention;
FIG. 2 is a second model diagram of the deep water salvaging process constructed by the present invention.
Reference numerals: 1-salvage ship, 2-cable and 3-sea cable.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, in which some parts are omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other examples obtained based on the examples in the present invention are within the scope of the present invention.
In order to better explain the invention, the following detailed description is made in conjunction with FIGS. 1-2 and specific examples.
The Orcaflex is a nonlinear time domain finite element software program, is mainly used for static and dynamic modeling of a system used in an offshore construction environment, and is mainly applied to the aspects of oceanographic engineering, oceanographic research and the like. The Orcaflex is easy to be used for dynamic calculation analysis and environmental load of marine engineering slender structures, has the characteristics of multitasking, batch processing and high analysis capability and a convenient, visual and high-quality graphical user interface, and can simply and quickly establish a model. The Orcaflex system image displays an optional wire frame or three-dimensional entity display, can perform coupling analysis on the floating body and the wire rod structure, and can establish various seabed conditions including a flat seabed surface, a two-dimensional seabed surface and a three-dimensional seabed surface. A finite element model can be created by using Orcaflex to create a floating body model, and the force analysis of the cable infinitesimal section, the cable suspension line analysis, the cable water resistance infinitesimal analysis and the numerical simulation of the process of fishing the submarine cable are carried out.
The embodiment provides a construction method for salvaging, repairing and replaying a large-section oil-filled submarine cable in a deep water area, wherein the diameter of the large-section submarine cable is 138mm, and the construction method comprises the following steps:
s1, cleaning the covering on the submarine cable around the submarine cable fault point, and fully exposing the submarine cable 3 on the seabed.
S2, cutting off a submarine cable fault point at the seabed, and then independently fishing the submarine cable at the fault section to a fishing vessel 1; the method specifically comprises the following steps: the ROV is utilized to perform a seabed small-amplitude lifting cutting project on the seabed, and it is noted that the seabed cutting needs to be performed twice at two ends of a submarine cable fault point, and the submarine cable is divided into three sections.
S3, salvaging one of the remaining sea cables after cutting, partially cutting off the cut end of the sea cable again, testing, plugging and hanging a buoy after cutting off, and floating the sea cable on water; after the submarine cable fault point is cut off, seawater enters the original submarine cable structure, so that the part needs to be cut off completely; mainly testing electrical on-off conditions, such as electrical continuity testing; temporary joints or lead ladles are generally adopted for plugging, so that seawater is prevented from flowing into the submarine cable again.
S4, salvaging the other sea cable left after cutting, partially cutting and testing the cut end of the sea cable again, and connecting a spare pipe cable matched with the cut end of the sea cable; after the submarine cable is connected with the spare pipe cable, the tensioner and the launching bridge can be adopted to control the stress condition of the rest section, control the navigational speed, the stress and the angle to move to the other end of the newly-hung buoy, and simultaneously relax the spare pipe cable to carry out playback laying of one end.
S5, fishing the submarine cable with the tag in the step S3, connecting the submarine cable with the spare pipe cable in the step S4, and testing; and carrying out electrical continuity test on the connected cable.
S6, the ship body moves laterally, the repaired submarine cable is slowly placed into water, and the submarine cable is subjected to flush protection along the laying and playback path.
The method is mainly suitable for deepwater submarine cable repair engineering and has larger movement for the submarine cable repair section. It should be noted that: the stress of the submarine cable is complex in the whole process, so that the secondary damage to the submarine cable can not be generated in the salvage process, the maintenance cost is further increased, the parameterization determination is required to be performed on key steps and detailed flows in the salvage and playback process, and the specific solution scheme is as follows:
step one, simulating a fishing and playback process of a submarine cable through orcaflex software, and extracting results such as key stress points, tension, curvature and the like of the submarine cable, wherein the method specifically comprises the following steps:
performing simulation analysis on salvage and playback stress of the submarine cable by adopting Orcaflex software, wherein the simulation analysis method comprises the following steps:
the first step is as follows: setting an analysis step in General, and setting analysis step time by considering initial submarine cable standing and salvage water depth;
the second step: according to engineering requirements, setting marine environments (including water depth, ocean current flow speed, wave parameters, submarine topography, submarine soil parameters and the like) in an Environment;
the third step: according to engineering requirements, the size of a salvage ship, the initial position of the salvage ship, the movement speed of the salvage ship and the like are arranged in Vessels;
the fourth step: according to engineering requirements, submarine cable parameters are set in Lines (cables), wherein the parameters comprise submarine cable length, unit length, submarine cable mechanical properties, fixed point positions and the like;
the fifth step: according to engineering requirements, a state of a cable 2 is set in a Winches (winch), the initial state of the submarine cable is free, the initial tension is set to be 0, and the speed of the cable needs to be set to ensure that the submarine cable is salvaged to a salvage ship when analysis is completed;
and a sixth step: according to the engineering requirement, the shape of a winch is simulated, the shape of the winch is set to be cylindrical in Shapes (Shapes), and the winch is arranged on one side of a salvage ship and connected with a cable;
the seventh step: the relationship between the parameters is finely adjusted in All objects data (parameter relationship), the consistency of each connection point is ensured, and then the calculation is submitted.
Eighth step: and after the operation is finished, selecting key data such as curvature, tension and the like in the Select Result, and outputting an image and a table.
Step two, judging the structural safety of the submarine cable in the construction process according to the mechanical property of the submarine cable, wherein the specific requirements are as follows: in the whole construction process, the internal tension of the submarine cable is less than or equal to the allowable installation tension of the submarine cable; in the whole construction process, the bending radius of each store in the integral line shape of the submarine cable is smaller than the minimum bending radius requirement of the submarine cable. (how to judge the security of the structure, please give a detailed judgment process).
And step three, adjusting parameters, seeking a proper salvage scheme and setting the parameters.
The main parameter selection reasons of the deep water area large-section oil-filled submarine cable salvage repair and playback construction are as follows:
in the fishing construction process, the submarine cable is in a catenary shape and is in a dynamic change process. In order to ensure the safety of the submarine cable structure, the submarine cable cannot have larger tension and curvature in the fishing process, so that the related parameters in the fishing process need to be controlled. The main factors affecting the linearity of the catenary of a submarine cable are: cleaning length, lifting point height, hull movement speed, protection device (bend limiter) position and protection length. The cleaning length mainly influences the overall linearity of the submarine cable in the hoisting process, and can roughly determine the length required by cleaning the covering soil in the fishing process through the seawater depth, the fault length, the cutting length, the minimum bending radius and other data, so that the time waste caused by later flushing and burying maintenance due to excessive cleaning is avoided, or the undersize bending radius of the submarine cable at the boundary position of the covering soil and the non-covering soil due to too short cleaning covering soil length is avoided. If the ratio of the fishing speed to the advancing speed of the construction ship in the fishing stage is too large, the tension on the submarine cable is possibly too large, the submarine cable is stretched to lose efficacy, the original soil covering layer which is not cleaned is lost efficacy, and the safety risks such as the exposed submarine cable are caused; if the ratio of the two speeds is too small, the submarine cable may be damaged by bending, and thus the speed ranges of the two speeds need to be determined. The length and the position of the bending limiter mainly influence the bending rigidity of the submarine cable part and have certain influence on the whole linearity
In the playback construction process, the submarine cable is laid on the seabed in an omega shape along the transverse displacement direction of the ship body, and the integral linearity of the submarine cable is related to the length of the rear connecting cable, the moving speed of the ship body and the lowering speed. The whole linearity of in-process sea cable is transferred in the main influence of back connecting cable length, and when the back connecting cable is longer, need dispersion hoisting point or near hoisting point installation crooked limiter, avoid producing great crooked destruction, hull moving speed mutually supports with transfer speed, guarantees that the sea cable is laid on the seabed with safe linear stability.
The oil-filled submarine cable in a certain sea area is taken as a research object, and is mainly applied to high-capacity power transmission passing through rivers and straits, the outer diameter of the submarine cable is 0.138m, and the bending rigidity is 3.058kN & lt & gt 2 The axial stiffness was 193.707E3kN and the mass per unit length of air was 48kg/m.
In the model, the origin of the overall coordinates is set on the sea level, the Z-axis direction is vertically upward, and the X and Y directions satisfy the right-hand rule. The cable body is arranged in the X-axis positive direction.
Establishing a salvaging model: the method comprises the steps of establishing a submarine cable with the length of 700m, setting the initial water depth to be 100m, laying the submarine cable to the seabed in an omega shape, and ensuring that the submarine cable has enough extra length in the lifting process. In the direct fishing process, a bending limiting device is required to be added at a fishing point, a bending limiting device is added at the fishing point on the model, the length is 30m, in order to improve the accuracy of the calculation model, the submarine cable is divided into three parts, the connecting part of the bending limiting device is dispersed into a plurality of units with the length of 0.5m, the units with the length of 0.5m are dispersed in the bending limiting device close to 40m, and the rest parts are dispersed into a plurality of units with the length of 2 m. The fishing boat speed is 0.26m/s, and the lifting speed is 0.2m/s. The model is schematically shown in FIG. 1. After the result is extracted, the tension and the bending radius of the whole cable are both smaller than the specification, and the fishing scheme is feasible.
Building a submarine cable 700m long, fixing two ends of the submarine cable at the positions 170m on the left side and the right side, setting the initial water depth to be 100m, adding a bending limiter at the middle part, and taking the length to be 30m. The initial length of the cable is set and the sea cable is suspended on the vessel. The submarine cable is divided into three parts, the connecting part of the bending limiter is discrete into a plurality of units with the length of 0.5m in the part close to the bending limiter 40m, and the rest part of the connecting part of the bending limiter is discrete into a plurality of units with the length of 2 m. The speed of the playback vessel was 0.26m/s and the lowering speed was 0.23m/s. The model schematic is shown in fig. 2. After the result is extracted, the tension and the bending radius of the whole cable are both smaller than the specification, and the fishing scheme is feasible.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A deep water area large-section oil-filled submarine cable salvage repair and playback construction method is characterized by comprising the following steps:
s1, cleaning a covering on a submarine cable around a submarine cable fault point to fully expose the submarine cable on a seabed;
s2, cutting off a submarine cable fault point on the seabed, and then fishing out the submarine cable at the fault section;
s3, salvaging one of the remaining sea cables after cutting, partially cutting the cut end of the sea cable again, testing, plugging and hanging a buoy after cutting, and floating the sea cable on water;
s4, salvaging the other remaining submarine cable after cutting, performing partial cutting and testing on the cutting end of the submarine cable again, and connecting a spare pipe cable matched with the cutting end of the submarine cable;
s5, fishing the submarine cable with the tag in the step S3, connecting the submarine cable with the spare pipe cable in the step S4, and testing;
and S6, slowly putting the repaired submarine cable into water, and carrying out flush protection along the laying and playback path.
2. The deep water area large-section oil-filled submarine cable salvaging repair and playback construction method according to claim 1, wherein key steps and detailed flows in the salvaging and playback process need to be parameterized and determined, and the specific steps are as follows:
simulating and simulating the fishing and playback process of the submarine cable by simulation software, and extracting key stress points, tension and curvature of the submarine cable;
judging the structural safety of the submarine cable in the construction process according to the mechanical properties of the submarine cable;
and adjusting parameters, seeking a proper fishing scheme and setting the parameters.
3. The deep water area large-section oil-filled submarine cable salvaging, repairing and replaying construction method according to claim 2, wherein the steps of extracting key stress points, tension and curvature of the submarine cable through simulation software are as follows:
establishing a parameter input model in simulation software, and inputting basic setting parameters, environment setting parameters, salvage ship setting parameters, submarine cable setting parameters, cable setting parameters and winch setting parameters in the parameter input model;
establishing a parameter adjusting model in simulation software, and adjusting the relation among parameters by adopting the parameter adjusting model to ensure the continuity of the parameter connection points;
and establishing a data generation model in simulation software, and calculating by adopting the data generation model according to the adjusted parameters to obtain the stress data of each position of the submarine cable.
4. The deep water area large-section oil-filled submarine cable salvaging, repairing and replaying construction method according to claim 3, wherein the foundation setting parameters comprise analysis steps and analysis time.
5. The deep water area large-section oil-filled submarine cable salvage repair and playback construction method according to claim 3, wherein the environment setting parameters comprise ocean current flow velocity, wave parameters, submarine topography and submarine soil parameters.
6. The deepwater large-section oil-filled submarine cable salvage repair and playback construction method according to claim 3, wherein salvage ship setting parameters comprise a salvage ship size, a salvage ship initial position and a salvage ship moving speed.
7. The deep water area large-section oil-filled submarine cable salvaging, repairing and replaying construction method according to claim 3, wherein the submarine cable setting parameters comprise submarine cable length, unit length, submarine cable mechanical properties and fixed point positions.
8. The deep water large-section oil-filled submarine cable salvaging, repairing and replaying construction method according to claim 3, wherein the cable setting parameters comprise cable salvaging speed and cable state.
9. The deepwater large-section oil-filled submarine cable salvage repair and playback construction method according to claim 3, wherein winch setting parameters comprise winch shape and winch position.
10. The deep water area large-section oil-filled submarine cable salvaging, repairing and replaying construction method according to any one of claims 3-9, wherein the simulation software comprises Orcaflex software.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117074068A (en) * | 2023-10-12 | 2023-11-17 | 中国电力工程顾问集团中南电力设计院有限公司 | Submarine cable rush repair, salvage and playback process test device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117074068A (en) * | 2023-10-12 | 2023-11-17 | 中国电力工程顾问集团中南电力设计院有限公司 | Submarine cable rush repair, salvage and playback process test device and method |
| CN117074068B (en) * | 2023-10-12 | 2024-01-09 | 中国电力工程顾问集团中南电力设计院有限公司 | Submarine cable rush repair, salvage and playback process test device and method |
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