CN119674803A - A method and device for efficiently installing and constructing a long-length ultra-high voltage submarine cable on the seabed - Google Patents
A method and device for efficiently installing and constructing a long-length ultra-high voltage submarine cable on the seabed Download PDFInfo
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- CN119674803A CN119674803A CN202411224297.XA CN202411224297A CN119674803A CN 119674803 A CN119674803 A CN 119674803A CN 202411224297 A CN202411224297 A CN 202411224297A CN 119674803 A CN119674803 A CN 119674803A
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Abstract
本发明公开一种大长度超高压海缆海底高效安装施工方法及其装置,属于海底海缆安装施工技术领域，该方法包括以下步骤：S1、过驳接缆；S2、路由扫海；S3、海上风电机组侧海缆始端铺设；S4、投放埋设机；S5、敷埋海缆；S6、回收埋设机；S7、海上升压站侧海缆终端铺设。本发明在施工前进行路由扫海并关注天气状况，提前对施工障碍进行清除，能确保施工的顺利进行，从而保证了工期，提高了施工效率。本发明在海上风电机组侧海缆始端铺设施工中，在塔筒筒壁上的海缆入口处增设了倒刺型海缆保护套，对海缆起到了很好的防护作用，尤其是在牵引头和倒刺型海缆保护套之间采用自断螺丝连接的方式，倒刺型海缆保护套在施工船上预先安装，倒刺型海缆保护套便自行卡到海缆入口中，从而解决了由潜水员到水下安装，所出现的安装时间长、劳动强度大的问题。
The present invention discloses a long-length ultra-high voltage submarine cable submarine efficient installation construction method and device thereof, belonging to the field of submarine cable installation construction technology, the method comprises the following steps: S1, transshipment and cable connection; S2, route sweeping; S3, laying the beginning of the submarine cable on the offshore wind turbine side; S4, launching the burying machine; S5, laying the submarine cable; S6, recovering the burying machine; S7, laying the submarine cable terminal on the offshore booster station side. The present invention performs route sweeping and pays attention to weather conditions before construction, clears construction obstacles in advance, can ensure the smooth progress of construction, thereby ensuring the construction period and improving construction efficiency. In the laying construction of the submarine cable starting end on the side of the offshore wind turbine, the present invention adds a barbed submarine cable protective cover at the submarine cable entrance on the tower wall, which plays a good protective role for the submarine cable, especially the self-breaking screw connection method is adopted between the traction head and the barbed submarine cable protective cover. The barbed submarine cable protective cover is pre-installed on the construction ship, and the barbed submarine cable protective cover is automatically stuck in the submarine cable entrance, thereby solving the problem of long installation time and high labor intensity caused by underwater installation by divers.
Description
Technical Field
The invention relates to the technical field of submarine cable installation and construction, in particular to a high-efficiency submarine cable installation and construction method and device for a large-length ultrahigh-pressure submarine cable.
Background
At present, in the installation construction of a submarine cable between an offshore booster station and an onshore switching station, the problems are that firstly, in the construction, the construction is usually stopped due to an emergency, so that the construction efficiency is not high, secondly, the submarine cable is impacted by sea water at the bottom side part of an offshore wind turbine generator, the submarine cable can shake, so that the tension of the submarine cable is increased, particularly, the submarine cable at the submarine cable inlet on the wall of a tower drum of the wind turbine generator is easily damaged, thirdly, the submarine cable is impacted by sea water at the bottom side part of the offshore booster station, a scouring pit is easily formed near a pile foundation of the offshore booster station, the tail end of a J-shaped pipe is frequently scoured, so that the submarine cable at the point is suspended, and then the submarine cable can shake along with the reciprocating motion of ocean currents, so that the tension of the submarine cable is increased, and the submarine cable is damaged.
Disclosure of Invention
The invention aims to provide a high-efficiency installation and construction method and a device thereof for a long-length ultrahigh-pressure submarine cable submarine, which can ensure smooth construction.
In order to solve the technical problems, the invention adopts the following technical scheme:
A high-efficiency installation construction method for a large-length ultrahigh-pressure submarine cable comprises the following steps:
s1, connecting the sea cables of different specifications of the sea cable factory onto an electric cable drum of a construction ship in a gap-winding manner from bottom to top in a concentric circle manner, temporarily changing the construction sequence according to the actual condition of the site during construction, and avoiding repeated cable reversing, thereby solving the problems of large sea cable engineering quantity in the wind power field, numerous sea cable model specifications and fixed sea cable construction sequence caused by the sequence of the sea cables.
S2, route sea sweeping, namely, utilizing anchor boat tail system sea sweeping tools to design route to and fro along a sea cable between the offshore booster station and the offshore wind turbine, and thoroughly cleaning before the construction of the sea cable when obstacles on the sea surface and on the sea bottom are found;
S3, paving the starting end of a submarine cable at the side of the offshore wind turbine;
S4, throwing the burying machine, namely firstly, putting the submarine cable into the abdominal cavity of the burying machine after passing through the cable guiding cage, and lifting the burying machine to be suspended on the water surface by using a crane to connect the high-pressure water pump and the water delivery rubber pipe of the burying machine;
s5, burying a submarine cable, namely burying the submarine cable in the seabed by using a burying machine;
s6, recycling the burying machine, namely hoisting the burying machine to a construction ship by using a crane on the construction ship;
s7, laying a submarine cable terminal at the side of the offshore booster station.
Further, in step S1, the specific method for the submarine cable to cross the connection cable is as follows:
S1.1, detecting the performance of a submarine cable in a submarine cable factory before the submarine cable is connected;
s1.2, berthing the construction ship against a wharf of a submarine cable factory, and adjusting and fixing the ship position to align the center of a cable disc of the construction ship with the center of a cable conveying frame of a submarine cable manufacturer;
S1.3, conveying the submarine cable to a construction ship along a trestle, binding a steel rope net sleeve on a submarine cable head by a worker, towing the submarine cable head into an electric submarine cable drum after passing through a cable conveying frame on the construction ship, and reserving a length of 5m in the electric submarine cable drum before coiling the submarine cable head so as to facilitate submarine cable testing;
s1.4, starting an electric turntable, and automatically winding up the cable;
S1.5, after the connection of the refuting cable is finished, removing the steel rope net cover on the submarine cable head, detecting the performance of the submarine cable again, and confirming that each performance index meets engineering design requirements.
Further, in step S1.4, the speed of the overboard connecting cable is controlled within 600 m/h.
Further, in step S2, the anchor boat tail sea sweeping tool is a 900HP anchor boat tail sea sweeping tool.
Further, in step S3, the specific method for laying the starting end of the submarine cable at the side of the offshore wind turbine is as follows:
s3.1, the construction ship is driven to an offshore wind turbine, and when the construction ship reaches a preset position near a tower drum of the wind turbine, the construction ship is positioned on a submarine cable burying route axis by using an anchoring positioning system on the construction ship;
S3.2, accurately measuring the laying length of the initial end of the submarine cable;
S3.4, the sea cable head is pulled out from an electric cable tray on the construction ship through a back-twist frame and enters the sea through a water inlet tank at the ship side, when the sea cable head pulls out of a deck of the construction ship, a pulling head is arranged on the sea cable head, the pulling head is connected with one end of a steel wire rope, the other end of the steel wire rope passes through a sea cable inlet on the wall of a tower drum of the wind turbine generator, upwards bypasses a pulley on a portal at the top of the tower drum of the wind turbine generator, and then is connected with a winch on the construction ship;
S3.5, starting a winch to pull the submarine cable head, and simultaneously laying the submarine cable by a cable laying machine on the construction ship until the submarine cable head passes through a submarine cable inlet on the wall of the wind turbine tower and moves upwards to the top of the wind turbine tower, and reserving the length and design allowance of the submarine cable;
and S3.6, finally fixing the submarine cable on a tower barrel of the offshore wind turbine, and finishing laying of the starting end of the submarine cable at the side of the offshore wind turbine.
Further, in the step S3.4, the specific method for arranging the traction head on the submarine cable head is that a traction net sleeve is arranged on the submarine cable head, the submarine cable head is pulled into the barb-type submarine cable protective sleeve by the traction net sleeve, the traction head is connected with the traction net sleeve, and meanwhile the traction head is connected with the barb-type submarine cable protective sleeve through a self-breaking screw.
Further, in step S3.5, the winch is started, the traction force is not greater than the self-breaking force of the self-breaking screw, the barb type submarine cable protective sleeve moves along with the submarine cable in the process of pulling the submarine cable head until the barb type submarine cable protective sleeve is inserted into the submarine cable inlet on the wall of the wind turbine tower and is blocked in the submarine cable inlet, the traction force is gradually increased under the continuous action of the winch, when the traction force is greater than the self-breaking force of the self-breaking screw, the self-breaking screw is broken, the pulling head is separated from the barb type submarine cable protective sleeve, and the pulling head pulls the submarine cable head to move upwards to the top of the wind turbine tower in the wind turbine tower through the pulling net sleeve.
Anchor boat, arranging a traction anchor at the seabed in front of a construction ship along a submarine cable burying route in advance according to DGPS positioning, arranging a traction winch on the construction ship, tying one end of a traction steel wire on the traction winch on the traction anchor in the sea, starting the traction winch, driving the construction ship to move by the traction steel wire, driving a burying machine to move by the construction ship, starting a high-pressure water pump on the construction ship, sucking seawater by the high-pressure water pump, supplying water to a hydraulic plow harrow of the burying machine by a water delivery rubber tube, cutting a submarine soil body into a groove along the submarine cable burying route by hydraulic spraying, and placing the submarine cable into the groove by a sledge at the rear part of the burying machine to level the groove so as to coat the submarine cable.
Further, in the step S6, when the submarine cable is laid to a preset position near the offshore booster station, the traction winch and the high-pressure water pump are closed, anchor boat is used for assisting the construction ship, the four positioning anchors are thrown to the preset position by using DGPS navigation positioning to fix the construction ship, the crane on the construction ship is started, the buried cable is slowly lifted off the mud surface under the monitoring of the monitoring system, the cable guide cage arranged on the traction steel cable is gradually removed, the submarine cable is kept under a certain tension during the lifting of the buried cable and the submarine cable out of the water surface, the submarine cable is prevented from being suddenly loosened to be twisted, the crane lifts the buried cable to the water surface, the belly opening of the buried cable is kept at the same height with the submarine cable, the submarine cable is taken out from the buried cable, and finally the buried cable is lifted to the construction ship.
Further, the construction operation conditions are as follows, 6-level wind conditions, 3-level sea conditions and below, and the visibility is more than 1km.
Further, when the construction ship performs the operation of laying, the front side of the construction ship is 800 meters, and the rear side of the construction ship is within 300 meters to form a restricted navigation area.
Further, in the step S7, the specific method for laying the sea cable terminal at the offshore booster station comprises the steps of pulling the sea cable through a back-twist frame by a cable laying machine on a construction ship, placing a sea cable drum unreeled from an electric cable drum on a deck of the construction ship, cutting off the sea cable on the construction ship after the unreeled sea cable reaches the sea cable terminal laying length, sealing and winding waterproof tapes on a sea cable head formed after cutting off by using a heat-shrinkage seal head cap, installing a central clamp and a bending limiter at a preset position of the sea cable, checking a J-shaped pipe inlet on the offshore booster station underwater by a diver, flushing out enough space at the J-shaped pipe inlet position by adopting an air suction device if the J-shaped pipe inlet is back-silted, penetrating one end of a steel wire rope on a winch on the construction ship from the J-shaped pipe upper opening, winding a pulley on the booster station portal at the moment, connecting the sea cable head on the construction ship, starting the winch, moving the sea cable head upwards through the J-shaped pipe to the offshore booster station, inserting the central clamp into the bent cone clamp at the sea cable head, guiding the bent cone to the lower side of the offshore booster station, and fixing the bent cone to the bent cone on the sea cable terminal at the sea terminal station, and finally fixing the bent cone on the sea cable terminal at the sea terminal station.
Further, in step S7, the sea cable unwound from the electric cable drum is laid on the deck of the construction vessel in a figure 8 shape.
The device for the high-efficiency installation and construction method of the large-length ultrahigh-voltage submarine cable comprises a burying machine, wherein the burying machine is an HLA-4 submarine cable mechanical burying machine.
The device for the high-efficiency installation and construction method of the submarine cable with the ultrahigh length comprises a central clamp, wherein the central clamp is of a Harvard structure.
The device for the high-efficiency installation and construction method of the large-length ultrahigh-pressure submarine cable comprises a bending limiter, wherein the bending limiter adopts a Harvard structure.
The invention has the beneficial effects that:
The invention carries out route sea sweeping and pays attention to weather conditions before construction, clears construction barriers in advance, and ensures the smooth construction, thereby ensuring the construction period and improving the construction efficiency.
In the invention, in the construction of laying the beginning end of the submarine cable at the side of the offshore wind turbine, the barb-type submarine cable protective sleeve is additionally arranged at the submarine cable inlet on the wall of the tower barrel of the offshore wind turbine, so that the submarine cable is well protected, in particular, the barb-type submarine cable protective sleeve is pre-installed on a construction ship in a self-breaking screw connection mode, when the barb-type submarine cable protective sleeve moves to the submarine cable inlet on the wall of the tower barrel of the offshore wind turbine along with the submarine cable, the barb-type submarine cable protective sleeve is automatically clamped to the submarine cable inlet, and the barb on the submarine cable protective sleeve can prevent the submarine cable protective sleeve from falling out from the submarine cable inlet, so that the problems of long installation time and high labor intensity caused by underwater installation of a diver are solved, and the construction efficiency is improved.
In the submarine cable laying process of the offshore booster station, the center clamp and the bending limiter are arranged on the submarine cable at the inlet of the J-shaped pipe, so that the submarine cable is prevented from being excessively bent, and the damage to the submarine cable can be effectively avoided.
In the process of passing and connecting the sea cables, the sea cables with different specifications in the sea cable factory are passed and connected to the electric cable drum of the construction ship, the sea cables with different specifications are separately coiled and put on the electric cable drum from bottom to top in a concentric circle mode, the construction sequence can be temporarily changed according to the actual condition of the site during construction, repeated cable rewinding is not needed, and the problems that the sea cable engineering amount in the wind power field is large, the sea cable model specifications are numerous, and the sea cable construction sequence is fixed due to the sequence of the sea cable connection are solved.
Drawings
FIG. 1 is a flow chart of the high-efficiency installation construction method of the large-length ultra-high-voltage submarine cable of the invention;
FIG. 2 is a construction state diagram of the side submarine cable initial end laying of the offshore wind turbine of the invention;
FIG. 3 is a state diagram of the offshore wind turbine side submarine cable initial end laying process after the installation of the traction head and the barb type submarine cable protective sleeve is completed;
FIG. 4 is a view showing the state where the pulling head and the barbed submarine cable protecting jacket are separated after the self-breaking screw is broken;
FIG. 5 is a state diagram of the process of burying submarine cables according to the invention;
FIG. 6 is a state diagram in a submarine cable laying installation of the terminal offshore booster station of the present invention;
Fig. 7 is a state diagram of the present invention after the installation of the center clamp and the bending limiter.
In the figure, 1, a construction ship, 2, an offshore wind turbine, 3, a tower, 4, a steel wire rope, 5, a submarine cable inlet, 6, a portal, 7, a pulley, 8, a winch, 9, a traction head, 10, a submarine cable head, 11, a traction net sleeve, 12, a barb-type submarine cable protective sleeve, 13, a self-breaking screw, 14, a submarine cable, 15, a barb, 16, a traction winch, 17, a traction steel wire, 18, a traction anchor, 19, a burying machine, 20, a high-pressure water pump, 21, a water hose, 22, a hydraulic plow harrow, 23, a warning ship, 24, a cable distributor, 25, a marine booster station, 26, a J-shaped pipe, 27, a booster station, 28, a pulley, 29, a center clamp, 30, a bending limiter, 31, a guide cone, 32, a conical ring, 33 and a connecting shaft.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the present application will be described in further detail with reference to the accompanying drawings and the specific embodiments, and it should be noted that the embodiments of the present application and features in the embodiments may be combined with each other without conflict.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper surface", "lower surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward rotation", "reverse", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
As shown in fig. 1, a method for high-efficiency installation and construction of a large-length ultra-high-voltage submarine cable,
The method comprises the following steps:
S1, connecting cables in a refuting mode:
The sea cables with different specifications in the sea cable factory are connected to the electric cable drum of the construction ship in a refuting mode, the sea cables with different specifications are separately coiled and put on the electric cable drum from bottom to top in a concentric circle mode, and the construction sequence can be temporarily changed according to the actual condition of the site during construction, so that repeated cable rewinding is not needed.
The specific method for the submarine cable to pass through the connection cable is as follows:
s1.1, detecting the performance of the submarine cable in a submarine cable factory before the submarine cable is connected.
S1.2, the construction ship is berthed to a wharf of a submarine cable factory, and the ship position is adjusted and fixed, so that the center of a cable disc of the construction ship is aligned with the center of a cable conveying frame of a submarine cable manufacturer.
S1.3, conveying the submarine cable to a construction ship along a trestle, binding a steel rope net sleeve on a submarine cable head by a worker, towing the submarine cable head into an electric submarine cable drum after passing through a cable conveying frame on the construction ship, and reserving a length of 5m in the electric submarine cable drum before coiling the submarine cable head so as to facilitate submarine cable testing.
S1.4, starting an electric turntable, automatically winding the cable, and controlling the speed of the cable passing through the connector within 600 m/h.
S1.5, after the connection of the refuting cable is finished, removing the steel rope net sleeve, detecting the performance of the submarine cable again, and confirming that each performance index meets engineering design requirements.
S2, route sea sweeping:
the sea cable design route between the offshore booster station and the offshore wind turbine generator is utilized to sweep back and forth by utilizing the 900HP anchor boat tail system sea sweeping tool, and when obstacles such as a cultivation net cage, a pile, a fishing net, a buoy, a net, ropes, cables, piles, a sunken ship and the like remained on the sea surface are found, the obstacles are thoroughly cleaned before the construction of the sea cable.
S3, paving the starting end of a submarine cable at the side of the offshore wind turbine generator system:
The method for laying the starting end of the sea cable at the side of the offshore wind turbine comprises the following steps of S3.1, when the construction ship 1 moves to the offshore wind turbine 2 and reaches a preset position near a tower drum 3 of the offshore wind turbine 2, positioning the construction ship on a sea cable embedded routing shaft by utilizing an anchoring positioning system on the construction ship 1, S3.2, accurately measuring the laying length of the starting end of the sea cable, S3.3, sealing the sea cable head 10 by using a heat-shrinkable sealing head cap on the construction ship, winding a waterproof tape, S3.4, pulling the sea cable head out of an electric cable disc on the construction ship and entering the sea through a water inlet groove at the side of the ship, when the sea cable head pulls out of a deck of the construction ship, arranging a pulling head 9 on the sea cable head 10, connecting the pulling head 9 with one end of a steel wire 4, enabling the other end of the steel wire 4 to pass through a sea cable inlet 5 on the tower drum 3 of the offshore wind turbine, upwards bypassing a pulley 7 on the top of the tower drum 6 of the offshore wind turbine, connecting with a winch 8 on the construction ship 1, S3.5, and finally enabling the sea cable head to pass through the sea cable drum 6 and the sea cable drum to be laid on the sea cable drum wall, and finally, fixing the sea cable head on the sea cable drum to the sea cable drum wall and the sea cable drum wall to the sea cable drum is laid on the sea drum wall, and the sea cable drum wall is designed.
In step S3.4, the specific method for arranging the traction head on the submarine cable head is that a traction net sleeve 11 is arranged on the submarine cable head 10, the submarine cable head 10 is pulled into a barb-type submarine cable protective sleeve 12 by the traction net sleeve 11, the traction head 9 is connected with the traction net sleeve 11, and meanwhile the traction head 9 is connected with the barb-type submarine cable protective sleeve 12 through a self-breaking screw 13. The periphery of the barb type submarine cable protective sleeve 12 is provided with barbs 15.
In step S3.5, the winch 8 is started, the traction force is not greater than the self-breaking force of the self-breaking screw, in the process of pulling the submarine cable head, the barb-type submarine cable protective sleeve 12 moves along with the submarine cable 14 until the barb-type submarine cable protective sleeve 12 is inserted into the submarine cable inlet 5 on the wall of the wind turbine tower and is blocked in the submarine cable inlet 5, the traction force is gradually increased under the continuous action of the winch 8, when the traction force is greater than the self-breaking force of the self-breaking screw 13, the self-breaking screw 13 is pulled to break, the pulling head 9 is separated from the barb-type submarine cable protective sleeve 12, and the submarine cable head 10 is pulled by the pulling net sleeve 11 to move upwards to the top of the wind turbine tower in the wind turbine tower 3.
In the construction process, if the barb type submarine cable protecting sleeve 12 cannot enter the submarine cable inlet 5 on the tower drum wall 3 of the wind turbine generator set to reach the design position, the diver can drain to check the reason why the barb type submarine cable protecting sleeve 12 is blocked and the actual position of the barb device, and information is transmitted to a construction ship and a fan traction group. According to the received feedback information, the fan pulls the team to play back the steel wire rope for a certain distance properly, and the construction ship adjusts the ship position so that the position of the barb-type submarine cable protecting sleeve 12 is adjusted to a proper position. After confirmation by divers, the fan pulling team resumes the pulling of the barb device, and the construction ship properly loosens the steel wire rope according to the diver instruction, so that the barb-type submarine cable protecting sleeve 12 enters the submarine cable inlet 5. If the above steps still cannot enter the designated position, the construction ship retrieves the barbed submarine cable protective sleeve 12 to the deck, and checks the barbed submarine cable protective sleeve 12 to see if the barbed submarine cable protective sleeve 12 is damaged. If the marine cable is not damaged, the ship is readjusted to pull, and if the marine cable is damaged, the marine cable protecting sleeve 12 is replaced with a new barb type marine cable protecting sleeve.
S4, throwing the burying machine, namely firstly, putting the submarine cable into the abdominal cavity of the burying machine after passing through the cable guiding cage, lifting the burying machine by a crane to be suspended on the water surface, connecting a high-pressure water pump with a water delivery rubber pipe of the burying machine, and then, gently throwing the burying machine and the submarine cable into water, and keeping the burying machine horizontal during the period, wherein the burying machine is an HLA-4 submarine cable mechanical burying machine.
S5, laying a submarine cable:
The submarine cable is buried in the seabed by using a burying machine, and the construction operation conditions are as follows, 6-level wind conditions, 3-level sea conditions and below, and the visibility is more than 1km.
Anchor boat the specific method for laying sea cable is as follows, according to DGPS positioning, the traction anchor is arranged at the seabed in front of the construction ship 1 along the sea cable laying route in advance, the construction ship 1 is provided with a traction winch 16, one end of a traction steel wire 17 on the traction winch 16 is tied on the traction anchor 18 in the sea, the traction winch 16 is started, the traction steel wire 17 drives the construction ship 1 to move, the construction ship 1 drives the burying machine 19 to move, a high-pressure water pump 20 on the construction ship 1 is started, the high-pressure water pump 20 sucks sea water, water is supplied to a hydraulic plow 22 of the burying machine 19 through a water delivery rubber pipe 21, the hydraulic plow 22 cuts a seabed soil body into a groove through hydraulic spraying along the sea cable laying route, and the sea cable 14 is placed in the groove, and a sledge at the rear part of the burying machine 19 smoothes the groove to lay the sea cable 14. When the construction ship 1 performs the laying operation, the forestation area is set to be within 800 m in front of the construction ship and within 300 m in rear of the construction ship, and thus the warning ship 23 is provided in front of and behind the construction ship 1.
In the embodiment, anchor boat and the traction winch are arranged, the one-time throwing length of the traction steel wire rope is 1km, the two traction winches anchor boat and the two traction winches are alternately and uninterruptedly thrown forward, the defect that one traction winch needs to wait for throwing the traction steel wire cable laying ship in the past is avoided, the uninterrupted submarine cable laying construction is ensured, and the working efficiency is improved.
The working parameters of the burying machine are that the submarine cable diameter is 20-280 mm, the burying depth is 0.5-4.0 m, the traction speed is 3-10 m/min, the working water depth is 1.8-50 m, the water flow resistance is 6 knots, the working drag force is 8t, and the ground breaking shear force is 24Kpa. The weight of the burying machine is 19t, and the external dimension is 18m, 6m and 5m.
S6, recycling the burying machine:
the method for recovering the buried machine comprises the steps of closing a traction winch and a high-pressure water pump when a submarine cable is laid to a preset position near an offshore booster station, assisting the construction ship by anchor boat, throwing four positioning anchors to the preset position by using DGPS navigation positioning to fix the construction ship, starting the crane on the construction ship, slowly hanging the buried machine away from a mud surface under the monitoring of a monitoring system, gradually removing a cable guide cage arranged on a traction steel cable, keeping a certain tension of the submarine cable during the process of lifting the buried machine and the submarine cable out of the water, preventing the submarine cable from suddenly loosening and twisting, lifting the buried machine on the water surface by the crane, keeping a belly cavity opening of the buried machine and the submarine cable at the same height, taking the submarine cable out of the buried machine, and finally hanging the buried machine on the construction ship.
S7, laying a submarine cable terminal at the side of the offshore booster station:
As shown in fig. 6, a cable laying machine 24 on a construction ship 1 pulls a submarine cable through a back-twist frame, the submarine cable which is unreeled from an electric cable reel is laid on a deck of the construction ship in an 8-shaped reel, the submarine cable is cut off on the construction ship 1 after the unreeled submarine cable reaches the laying length of a submarine cable terminal, a thermal shrinkage sealing head cap is used for sealing and winding a waterproof adhesive tape on a submarine cable head formed after cutting, a central clamp 29 and a bending limiter 30 are arranged at a preset position of the submarine cable, a diver inspects an inlet of a J-shaped pipe 26 on an offshore booster station 25 underwater, if the inlet of the J-shaped pipe 26 is dredged, the inlet of the J-shaped pipe is punched out of a sufficient space by adopting an air suction device, the diver penetrates one end of a steel wire rope 4 on the winch 8 on the construction ship 1 from a lower opening of the J-shaped pipe and bypasses a pulley 28 on the booster station door frame 27, the winch 8 is started according to the situation, the pulling speed is adjusted until the J-shaped winch passes through the upper clamp 25 and the bending limiter is bent to the upper side of the submarine cable, the submarine cable is prevented from being bent, the end of the submarine cable is prevented from being damaged, and the submarine cable is prevented from being bent to be in a state of the upper side of the submarine cable is bent, and the submarine cable is prevented from being damaged, and the submarine cable is protected from being bent and being in a state of the end is protected.
As shown in fig. 7, in the submarine cable laying process of the terminal offshore booster station, the installation method of the center clamp and the bending limiter is as follows:
1) Determining the installation position of the central clamp on the submarine cable according to the position of the side J-shaped tube of the booster station and the required submarine cable allowance, and marking the submarine cable;
2) Installing a middle clamp 29 at the marked position, wherein the middle clamp 29 is of a Harvard structure, and after the two half parts of the middle clamp are held by a submarine cable and aligned, screwing a bolt, wherein the torque range of the bolt is 70-80 N.m;
3) Conical rings 32 are arranged on two sides of the middle clamp 29, and the accuracy of the angle of the conical rings is ensured;
4) A guide cone 31 is arranged on one side of an intermediate clamp 29 which is closer to the sea cable head on the sea cable, a bolt is screwed, the torque range of the screwed bolt is 70-80 N.m, and the guide cone is connected with the intermediate clamp by a screw;
5) A connecting shaft 33 is arranged on the other side of the middle clamp 29, holds the submarine cable, and screws the submarine cable, and sacrificial anode cathode protection blocks are arranged on the two sides of the middle clamp and are used for ensuring that the center clamp is not corroded for 25 years;
6) The bending limiter 30 is installed on the submarine cable, the bending limiter is of a Harvard structure, after the two half parts of the bending limiter are held around the submarine cable 14 and aligned, the bolts are screwed down, the torque of the bolts is 150-200 N.m, and the bending limiter 30 is connected with the connecting shaft 33. In the submarine cable laying process of the offshore booster station, the center clamp and the bending limiter are arranged on the submarine cable at the inlet of the J-shaped pipe, so that the submarine cable is prevented from being excessively bent, and the damage to the submarine cable can be effectively avoided. The bending limiter is made of polyurethane and other materials with high hardness, high strength, seawater corrosion resistance and low material density, and can meet the requirement of no additional weight to submarine cable and tensile strength not less than 40MPa. The bending limiter can bear 8t lateral pressure, and the service life of the product is not less than 30 years.
The device for the high-efficiency installation and construction method of the large-length ultrahigh-voltage submarine cable comprises a burying machine, wherein the burying machine is an HLA-4 submarine cable mechanical burying machine.
The device for the high-efficiency installation and construction method of the submarine cable with the ultrahigh length comprises a central clamp, wherein the central clamp is of a Harvard structure.
The device for the high-efficiency installation and construction method of the large-length ultrahigh-pressure submarine cable comprises a bending limiter, wherein the bending limiter adopts a Harvard structure.
Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (16)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412533A (en) * | 2011-11-28 | 2012-04-11 | 江苏海上龙源风力发电有限公司 | Intertidal zone submarine cable laying method |
| CN103247977A (en) * | 2013-05-14 | 2013-08-14 | 国家电网公司 | Multiphase submarine cable transversal arrangement circularly laying construction method |
| CN106207930A (en) * | 2016-07-28 | 2016-12-07 | 中天海洋系统有限公司 | A kind of offshore wind farm sea cable goes out J-type protection of pipe device |
| CN117673970A (en) * | 2023-12-11 | 2024-03-08 | 远东海缆有限公司 | Double-submarine cable different-ditch simultaneous laying process |
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2024
- 2024-09-03 CN CN202411224297.XA patent/CN119674803A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412533A (en) * | 2011-11-28 | 2012-04-11 | 江苏海上龙源风力发电有限公司 | Intertidal zone submarine cable laying method |
| CN103247977A (en) * | 2013-05-14 | 2013-08-14 | 国家电网公司 | Multiphase submarine cable transversal arrangement circularly laying construction method |
| CN106207930A (en) * | 2016-07-28 | 2016-12-07 | 中天海洋系统有限公司 | A kind of offshore wind farm sea cable goes out J-type protection of pipe device |
| CN117673970A (en) * | 2023-12-11 | 2024-03-08 | 远东海缆有限公司 | Double-submarine cable different-ditch simultaneous laying process |
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