CN111188324A - Overwater folding process for offshore wind power installation platform lifting system - Google Patents
Overwater folding process for offshore wind power installation platform lifting system Download PDFInfo
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- CN111188324A CN111188324A CN201911365983.8A CN201911365983A CN111188324A CN 111188324 A CN111188324 A CN 111188324A CN 201911365983 A CN201911365983 A CN 201911365983A CN 111188324 A CN111188324 A CN 111188324A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
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Abstract
The invention discloses an overwater folding process of a lifting system of an offshore wind power installation platform, wherein a main hull, pile shoes and lower sections of pile legs are folded on a slipway, an air bag is adopted for launching, after launching, common pile fixing frames and pile winding fixing frames are respectively folded in a floating state, and then the middle sections and the upper sections of the pile legs are respectively folded in a floating state; according to the invention, through reasonably planning the construction process, the pile fixing frame and the pile leg launching and floating state closing process are adopted, compared with a dock construction launching mode, the construction period can be shortened to 12 months, and the construction efficiency is greatly improved; meanwhile, through reasonable tooling and an offshore folding technology, the hoisting period is shortened, a large amount of renting cost of the heavy lift vessel is saved, and the method is economical and cost-effective.
Description
Technical Field
The invention relates to the field of shipbuilding, in particular to an overwater folding process for a lifting system of an offshore wind power installation platform.
Background
The main dimension of the offshore wind power installation platform is large, particularly the width is generally 30-40 meters, the length of the pile leg is generally 70-90 meters, most of self-elevating platforms are manufactured by docks or floating docks, the main ship bodies of the platforms are folded, and the lifting system is completely installed in place and then launched, so that the process has high requirements on hardware of shipyards, is high in cost, can be implemented only in a large shipyard and is not suitable for general small and medium shipyards; moreover, the construction period of the offshore wind power installation platform is generally at least 18 months, the manufacturing time is long, and the construction efficiency is low; the above problems need to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing an overwater folding process for an offshore wind power installation platform lifting system, which improves the construction efficiency, reduces the hoisting period, saves a large amount of renting cost of a heavy lift vessel and is economic and cost-effective by reasonably planning the construction process.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention discloses an overwater folding process for a lifting system of an offshore wind power installation platform, which is characterized by comprising the following steps of:
(1) pile leg segmental construction: the four pile legs have the same structure, three of the pile legs are divided into an upper section, a lower section and an upper section, and the other pile leg is divided into an upper section, a middle section and a lower section and is manufactured respectively, and the precision of the pile legs is ensured;
(2) manufacturing a pre-folding tool: the pre-folding tool comprises an upper connecting plate, an upper reinforcing bracket, a lower connecting plate, a lower reinforcing bracket and a connecting bolt; the upper reinforcing toggle plate is vertically welded with one side surface of the upper connecting plate, the lower reinforcing toggle plate is vertically welded with one side surface of the lower connecting plate, the other side surface of the upper connecting plate is attached to the other side surface of the lower connecting plate in parallel, and the upper reinforcing toggle plate and the lower reinforcing toggle plate are locked and fixed through connecting bolts;
(3) pile leg pre-folding process: the method comprises the following steps of sequentially laying all sections of each pile leg on a corresponding group roller carrier, pre-folding all the sections of each pile leg respectively, adjusting and controlling the precision of each pile leg, and uniformly arranging four sets of pre-folding tools at the position of a folding welding line of each pile leg along the circumferential direction of the pile leg respectively after ensuring that each pile leg meets the precision requirement; the upper reinforcing bracket of each pre-closing tool is only welded with the upper pile leg in a segmented mode, the lower reinforcing bracket is only welded with the lower pile leg in a segmented mode, and an upper connecting plate and a lower connecting plate are not welded with the pile legs in a segmented mode; then loosening the connecting bolts to separate the segments of each leg;
(4) the pile shoe and main hull slipway folding process comprises the following steps: arranging the pile shoe at the correct position of the slipway, adjusting the base line of the pile shoe to be parallel to the horizontal plane, and then adjusting the pile shoe to be concentric with the pile well section of the main hull without welding the pile shoe and the pile well section;
(5) the pile leg lower segment slipway folding process comprises the following steps: hoisting the lower section of each pile leg into the main hull section by section through a pile well of the main hull, welding the lower section of each pile leg with a corresponding pile shoe, and then temporarily and firmly fixing the lower section of each pile leg on the main hull through a fixing horse board; when the main ship body reaches a launching state, the main ship body can launch through the air bag;
(6) the pile fixing frame floating state folding process comprises the following steps: after the platform is launched, the platform is towed to the position near the wharf by a towing wheel and is safely moored; cross targets are manufactured on pile well sections of a main hull, the cross targets are manufactured on a common pile fixing frame and a pile winding pile fixing frame respectively, and all the cross targets are manufactured before launching; then, respectively installing a common pile fixing frame and a pile winding and fixing frame by using a floating crane, and ensuring that the common pile fixing frame or a cross target of the pile winding and fixing frame and a pile well subsection cross target of the main hull are in the same vertical position, namely indicating that the common pile fixing frame and the pile winding and fixing frame are installed in place;
(7) the pile leg floating closure process on the common pile fixing frame comprises the following steps: three pile legs of the upper and lower sections are respectively arranged on corresponding common pile fixing frames, after the common pile fixing frames are closed in a floating state on the sea, the lower sections of the corresponding pile legs and pile shoes are locked by using oil cylinders and bolts in the common pile fixing frames, the floating state of the platform is adjusted, and the closing position is ensured to be in a horizontal state; then, hoisting and folding the upper sections of the pile legs by using a heavy lift vessel, locking the pre-folding tool by using a connecting bolt, welding and folding the upper and lower sections of the pile legs after the precision of the pile legs reaches the precision of the pre-folding state of the pile legs on the shore, and assembling and welding a bolt box after the welding is finished; the other two pile legs are welded and folded in the same way;
(8) the pile leg floating closure process on the pile fixing frame: the pile legs of the upper, middle and lower sections are arranged on the pile winding and fixing pile frame, after the pile winding and fixing pile frame is closed in a floating state on the sea, the lower sections of the pile legs and the pile shoes are locked by using an oil cylinder and a bolt in the pile winding and fixing pile frame, the floating state of the platform is adjusted, and the closing position is ensured to be in a horizontal state; then, folding and installing an A-shaped frame platform of the pile winding crane on the top of the pile winding and fixing frame; and then, hoisting and folding the middle sections of the pile legs by using a heavy crane ship, locking the pre-folding tooling by using a connecting bolt, hoisting and folding the upper sections of the pile legs by using the heavy crane ship, locking the pre-folding tooling by using the connecting bolt, welding and folding the upper, middle and lower sections of the pile legs respectively after the precision of the pile legs reaches the precision of the pre-folding state of the pile legs on the bank, and then assembling and welding a bolt box after the welding is finished.
Preferably, in the step (1), the three pile legs segmented up and down are respectively installed on the corresponding common pile fixing frames, and the closure seam positions of the three pile legs are all arranged at the position 1.5 meters above the common pile fixing frames; the pile legs of the upper, middle and lower sections are arranged on the pile winding and fixing frame, and the closure seam positions are respectively arranged at the position 1.5 meters above the top of the pile winding and fixing frame and the position 1.5 meters above the A-shaped frame platform of the pile winding crane.
Preferably, in the step (1), the diameter of the cylinder of each pile leg is 3600mm, the roundness deviation is not more than 2mm, the full-length winding degree is not more than 30mm, and the length deviation is not more than 50 mm.
Preferably, in the step (3), the bolt box near the closing opening of each pile leg is not installed.
Preferably, in the step (4), the platform main hull is arranged on the slipway to ensure that the base line of the platform main hull is parallel to the horizontal plane; the gap between the uppermost end of the pile shoe and the bottom plate of the slipway at the corresponding position is 300 mm; the central line of the cylinder body of the pile shoe is superposed with the central line of the pile well subsection cylinder body of the main ship body, and the levelness of the upper opening of the cylinder body of the pile shoe is not more than 2 mm.
Preferably, in the step (6), the cross-shaped target is made of channel steel, and after the sample punching is finished, the channel steel is uniformly distributed at 90 degrees around the pile well subsection barrel of the main hull, and is arranged on the side wall and the top of the common pile fixing frame and the pile winding pile fixing frame.
Preferably, in the step (6), the deviation between the central line of the cylinder of the common pile fixing frame or the pile fixing frame around the pile and the central line of the cylinder of the pile well section of the main hull is not more than 5mm, and the folding position is ensured to be in a horizontal state.
Preferably, in the step (7), after the pre-closing tool of the previous pile leg is locked, the upper and lower sections of the pile leg are closed by spot welding, and after spot welding is completed, the heavy lift ship can release the hook, perform closing and hoisting operation on the next pile leg, and meanwhile, continue to perform welding operation on the upper and lower sections of the previous pile leg.
The invention has the beneficial effects that: according to the invention, through reasonably planning the construction process, the pile fixing frame and the pile leg launching and floating state closing process are adopted, compared with a dock construction launching mode, the construction period can be shortened to 12 months, and the construction efficiency is greatly improved; meanwhile, through reasonable tooling and an offshore folding technology, the hoisting period is shortened, a large amount of renting cost of the heavy lift vessel is saved, and the method is economical and cost-effective.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an installation process of a common pile fixing frame pile leg in the water closure process of the offshore wind power installation platform lifting system.
Fig. 2 is a schematic view of an installation process of fixing pile legs of a pile frame around a pile in the offshore assembly process of the offshore wind power installation platform lifting system.
FIG. 3 is a tooling layout diagram of the overwater folding process of the offshore wind power installation platform lifting system.
Fig. 4 is a schematic view of a-a in fig. 3.
FIG. 5 is a schematic view of B-B in FIG. 3.
Wherein, 1-pile leg; 2-pre-folding the tool; 3-connecting the upper connecting plate; 4-a lower connecting plate; 5-upper reinforcing toggle plates; 6-lower reinforcing toggle plate; 7-pile well section of the main hull; 8-pile shoe; 9-fixing a horse board; 10-lower pile leg sections; 11-common pile fixing frame; 12-upper leg sections; 13-winding the pile to fix the pile frame; 14-pile-winding crane A-shaped frame platform; 15-middle section of pile leg.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description.
The invention relates to an offshore wind power installation platform lifting system water folding process, which comprises the steps that a main ship body, pile shoes 8 and lower pile leg sections 10 are folded on a slipway, an air bag is adopted for launching, after launching, common pile fixing frames 11 and pile fixing frames 13 around piles are respectively folded in a floating state, and then middle pile leg sections 15 and upper pile leg sections 12 are respectively folded in a floating state; as shown in fig. 1 to 5, the specific implementation steps are as follows:
(1) pile leg 1 is built in sections: the four pile legs 1 have the same structure, three of the pile legs 1 are divided into an upper section, a lower section and the like to be manufactured respectively, and the other pile leg 1 is divided into an upper section, a middle section and a lower section and is manufactured respectively, so that the precision of the pile legs is ensured;
in the above steps, the four pile legs 1 comprise pile shoes 8 with the length of 95 meters, wherein the three pile legs 1 segmented up and down are respectively installed on the corresponding common pile fixing frames 11, and the closure seam positions are all arranged at 1.5 meters above the tops of the common pile fixing frames 11; the pile legs 1 of the upper, middle and lower sections are arranged on a pile winding fixing pile frame 13, and the closure seam positions of the pile legs are respectively arranged at the position 1.5 meters above the top of the pile winding fixing pile frame 13 and the position 1.5 meters above an A-shaped frame platform 14 of a pile winding crane; the setting position of the folding welding line is based on the consideration of safety and construction portability, a scaffold does not need to be built at the height of 1.5 m, a constructor can directly stand on the top of a pile fixing frame or on an A-shaped frame platform of a pile winding crane to carry out construction operation, and the construction safety and the construction portability are greatly improved;
as the precision requirement of the pile legs 1 is extremely high, the diameter of the cylinder body of each pile leg 1 is 3600mm, the roundness deviation is not more than 2mm, the full-length winding degree is not more than 30mm, and the length deviation is not more than 50 mm.
(2) Manufacturing a pre-folding tool 2: the pre-folding tool 2 comprises an upper connecting plate 3, an upper reinforcing bracket 5, a lower connecting plate 4, a lower reinforcing bracket 6 and a connecting bolt; an upper reinforcing bracket 5 is vertically welded with one side surface of the upper connecting plate 3, a lower reinforcing bracket 6 is vertically welded with one side surface of the lower connecting plate 4, the other side surface of the upper connecting plate 3 is attached to the other side surface of the lower connecting plate 4 in parallel, and the upper reinforcing bracket and the lower reinforcing bracket are locked and fixed through connecting bolts;
wherein, four groups of bolt holes are drilled at the corresponding positions of the upper connecting plate 3 and the lower connecting plate 4, and the specification of the connecting bolt is M27, 8.8 grade.
(3) Pile leg pre-folding process: the method comprises the following steps of sequentially laying all the sections of each pile leg 1 on a corresponding team roller carrier, pre-folding all the sections of each pile leg 1 respectively, adjusting and controlling the precision of the sections, and uniformly arranging four sets of pre-folding tools 2 at the position of a folding welding line of each pile leg 1 along the circumferential direction of the folding welding line after ensuring that each pile leg 1 meets the precision requirement; the upper reinforcing bracket 5 of each pre-closing tool 2 is ensured to be welded with the upper pile leg in a segmented manner, the lower reinforcing bracket 6 is ensured to be welded with the lower pile leg in a segmented manner, and the upper connecting plate 3 and the lower connecting plate 4 are not welded with the pile legs in a segmented manner; the connecting bolts are then loosened so that the segments of each leg 1 are separated;
in the above steps, when the offshore floating state is closed, as long as the connecting bolt is locked to a state of the pre-closing state, the precision of the pile leg at the moment can be ensured to reach the precision state of the on-shore pre-closing state;
bolt boxes near the folding openings of each pile leg 1 are not installed, so that constructors can conveniently enter the barrel of the pile leg 1 through the bolt opening holes to perform welding operation when the pile legs are folded in a floating state.
(4) Pile shoe 8 and main hull berth folding process: arranging the pile shoe 8 at the correct position of the slipway, adjusting the base line of the pile shoe 8 to be parallel to the horizontal plane, and then adjusting the pile shoe 8 to be concentric with the pile well section of the main hull without welding the pile shoe and the main hull;
in the steps, as the launching berths of the air bags are all provided with slopes, the slope ratio of the launching berths is 1:80, and the base line of the main hull of the platform is ensured to be parallel to the horizontal plane when the main hull of the platform is arranged on the berth for the subsequent installation of the lower sections 10 of the pile legs;
the gap between the uppermost end of the pile shoe 8 and the bottom plate of the slipway at the corresponding position is 300mm, so that the lower section 10 of the pile leg in the next step can be conveniently folded;
the central line of the cylinder body of the pile shoe 8 is superposed with the central line of the cylinder body of the pile well subsection 7 of the main ship body, and the levelness of the upper opening of the cylinder body of the pile shoe 8 is not more than 2 mm.
(5) The pile leg lower section 10 slipway folding process comprises the following steps: respectively hoisting each lower pile leg section 10 through a pile well section 7 of the main hull, respectively welding each lower pile leg section 10 with a corresponding pile shoe 8, and then respectively and temporarily and firmly fixing each lower pile leg section 10 on the main hull through a fixing horse board 9; when the main ship body reaches a launching state, the main ship body can launch through the air bag;
(6) the pile fixing frame floating state folding process comprises the following steps: after the platform is launched, the platform is towed to the position near the wharf by a towing wheel and is safely moored; cross targets are manufactured on the pile well sections 7 of the main hull, the cross targets are manufactured on the common pile fixing frame 11 and the pile winding pile fixing frame 13 respectively, and all the cross targets are manufactured before launching; then, a common pile fixing frame 11 and a pile winding fixing frame 13 are respectively installed by using a floating crane, and when the common pile fixing frame 11 or the cross target of the pile winding fixing frame 13 is ensured to be at the same vertical position with the cross target of the pile well segment 7 of the main hull, the common pile fixing frame 11 and the pile winding fixing frame 13 are both installed in place;
in the steps, the cross-shaped target is made of channel steel, and after the sample punching is finished, the channel steel is uniformly distributed at 90 degrees around the barrel body of the pile well section 7 of the main hull, and is arranged on the side wall and the top of the common pile fixing frame 11 and the pile winding pile fixing frame 13;
the deviation between the central line of the cylinder of the common pile fixing frame 11 or the pile fixing frame 13 and the central line of the cylinder of the pile well segment 7 of the main hull is not more than 5 mm; when the common pile fixing frame 11 or the pile winding pile fixing frame 13 is installed, the floating state of the platform is adjusted, the folding position is ensured to be in a horizontal state, the precision is easily ensured in the state, and the welding installation is easy.
(7) The pile leg 1 on the common pile fixing frame 11 floats and closes the process: three pile legs 1 of the upper and lower sections are respectively arranged on corresponding common pile fixing frames 11, after the floating state of the common pile fixing frames 11 on the sea is closed, oil cylinders and bolts in the common pile fixing frames 11 are started to lock the lower sections 10 and the pile shoes 8 of the corresponding pile legs, the floating state of a platform is adjusted, and the closing position is ensured to be in a horizontal state; then, hoisting and folding the upper sections 12 of the pile legs by using a heavy crane ship, locking the pre-folding tool 2 by using a connecting bolt, enabling the precision of the pile legs 1 to reach the precision of the pre-folding state of the pile legs 1 on the shore, then welding and folding the upper and lower sections of the pile legs 1, and then installing and welding a bolt box after welding is finished; the other two pile legs 1 are welded and folded in the same way;
in the steps, after the pre-closing tool 2 of the previous pile leg 1 is locked, the upper and lower sections of the pile leg 1 are closed through spot welding, the hook of the heavy lift ship can be released after spot welding, the hook closing time of the heavy lift ship is greatly reduced, the closing and hoisting operation of the next pile leg 1 can be carried out after the previous pile leg 1 is closed and released, the upper and lower sections of the previous pile leg 1 can be synchronously welded and closed, the closing efficiency is greatly improved, and a large amount of renting cost of the heavy lift ship is saved.
(8) The floating state folding process of the pile leg 1 on the pile fixing frame 13: the pile legs 1 of the upper, middle and lower sections are arranged on the pile winding fixing pile frame 13, after the pile winding fixing pile frame 13 is closed in a floating state on the sea, the lower sections 10 of the pile legs and the pile shoes 8 are locked by using oil cylinders and bolts in the pile winding fixing pile frame 13, the floating state of a platform is adjusted, and the closing position is ensured to be in a horizontal state; then, folding and installing an A-shaped frame platform 14 of the pile winding crane on the top of the pile winding fixing frame 13; and then, hoisting and folding the middle sections 15 of the pile legs by using a heavy crane, locking the pre-folding tool 2 by using a connecting bolt, hoisting and folding the upper sections 12 of the pile legs by using the heavy crane, locking the pre-folding tool 2 by using the connecting bolt, wherein the precision of the pile legs 1 reaches the precision of the pre-folding state of the pile legs 1 on the shore, welding and folding the upper, middle and lower sections of the pile legs 1 respectively, and then installing and welding a bolt box after welding.
In the steps, after the upper and lower sectional spot welding folding of the pile leg 1 on the last common fixed pile frame 11 is completed, the heavy lift ship can be unhooked, and the folding and lifting operation of the pile leg 1 on the pile fixed pile frame 13 is carried out, so that the hooking time of the heavy lift ship is greatly reduced, the upper and lower sectional welding folding operation of the pile leg 1 on the last common fixed pile frame 11 can be synchronously carried out, the folding efficiency is greatly improved, and a large amount of renting cost of the heavy lift ship is saved.
The invention has the following beneficial effects: according to the invention, through reasonably planning the construction process, the pile fixing frame and the pile leg launching and floating state closing process are adopted, compared with a dock construction launching mode, the construction period can be shortened to 12 months, and the construction efficiency is greatly improved; meanwhile, through reasonable tooling and an offshore folding technology, the hoisting period is shortened, a large amount of renting cost of the heavy lift vessel is saved, and the method is economical and cost-effective.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should fall into the protection scope of the present invention without departing from the design concept of the present invention, and the technical contents of the present invention as claimed are all described in the technical claims.
Claims (8)
1. An overwater folding process of an offshore wind power installation platform lifting system is characterized by comprising the following steps:
(1) pile leg segmental construction: the four pile legs have the same structure, three of the pile legs are divided into an upper section, a lower section and an upper section, and the other pile leg is divided into an upper section, a middle section and a lower section and is manufactured respectively, and the precision of the pile legs is ensured;
(2) manufacturing a pre-folding tool: the pre-folding tool comprises an upper connecting plate, an upper reinforcing bracket, a lower connecting plate, a lower reinforcing bracket and a connecting bolt; the upper reinforcing toggle plate is vertically welded with one side surface of the upper connecting plate, the lower reinforcing toggle plate is vertically welded with one side surface of the lower connecting plate, the other side surface of the upper connecting plate is attached to the other side surface of the lower connecting plate in parallel, and the upper reinforcing toggle plate and the lower reinforcing toggle plate are locked and fixed through connecting bolts;
(3) pile leg pre-folding process: the method comprises the following steps of sequentially laying all sections of each pile leg on a corresponding group roller carrier, pre-folding all the sections of each pile leg respectively, adjusting and controlling the precision of each pile leg, and uniformly arranging four sets of pre-folding tools at the position of a folding welding line of each pile leg along the circumferential direction of the pile leg respectively after ensuring that each pile leg meets the precision requirement; the upper reinforcing bracket of each pre-closing tool is only welded with the upper pile leg in a segmented mode, the lower reinforcing bracket is only welded with the lower pile leg in a segmented mode, and an upper connecting plate and a lower connecting plate are not welded with the pile legs in a segmented mode; then loosening the connecting bolts to separate the segments of each leg;
(4) the pile shoe and main hull slipway folding process comprises the following steps: arranging the pile shoe at the correct position of the slipway, adjusting the base line of the pile shoe to be parallel to the horizontal plane, and then adjusting the pile shoe to be concentric with the pile well section of the main hull without welding the pile shoe and the pile well section;
(5) the pile leg lower segment slipway folding process comprises the following steps: hoisting the lower section of each pile leg into the main hull section by section through a pile well of the main hull, welding the lower section of each pile leg with a corresponding pile shoe, and then temporarily and firmly fixing the lower section of each pile leg on the main hull through a fixing horse board; when the main ship body reaches a launching state, the main ship body can launch through the air bag;
(6) the pile fixing frame floating state folding process comprises the following steps: after the platform is launched, the platform is towed to the position near the wharf by a towing wheel and is safely moored; cross targets are manufactured on pile well sections of a main hull, the cross targets are manufactured on a common pile fixing frame and a pile winding pile fixing frame respectively, and all the cross targets are manufactured before launching; then, respectively installing a common pile fixing frame and a pile winding and fixing frame by using a floating crane, and ensuring that the common pile fixing frame or a cross target of the pile winding and fixing frame and a pile well subsection cross target of the main hull are in the same vertical position, namely indicating that the common pile fixing frame and the pile winding and fixing frame are installed in place;
(7) the pile leg floating closure process on the common pile fixing frame comprises the following steps: three pile legs of the upper and lower sections are respectively arranged on corresponding common pile fixing frames, after the common pile fixing frames are closed in a floating state on the sea, the lower sections of the corresponding pile legs and pile shoes are locked by using oil cylinders and bolts in the common pile fixing frames, the floating state of the platform is adjusted, and the closing position is ensured to be in a horizontal state; then, hoisting and folding the upper sections of the pile legs by using a heavy lift vessel, locking the pre-folding tool by using a connecting bolt, welding and folding the upper and lower sections of the pile legs after the precision of the pile legs reaches the precision of the pre-folding state of the pile legs on the shore, and assembling and welding a bolt box after the welding is finished; the other two pile legs are welded and folded in the same way;
(8) the pile leg floating closure process on the pile fixing frame: the pile legs of the upper, middle and lower sections are arranged on the pile winding and fixing pile frame, after the pile winding and fixing pile frame is closed in a floating state on the sea, the lower sections of the pile legs and the pile shoes are locked by using an oil cylinder and a bolt in the pile winding and fixing pile frame, the floating state of the platform is adjusted, and the closing position is ensured to be in a horizontal state; then, folding and installing an A-shaped frame platform of the pile winding crane on the top of the pile winding and fixing frame; and then, hoisting and folding the middle sections of the pile legs by using a heavy crane ship, locking the pre-folding tooling by using a connecting bolt, hoisting and folding the upper sections of the pile legs by using the heavy crane ship, locking the pre-folding tooling by using the connecting bolt, welding and folding the upper, middle and lower sections of the pile legs respectively after the precision of the pile legs reaches the precision of the pre-folding state of the pile legs on the bank, and then assembling and welding a bolt box after the welding is finished.
2. The offshore joining process of an offshore wind power installation platform lifting system according to claim 1, characterized in that: in the step (1), the three pile legs which are segmented up and down are respectively arranged on corresponding common pile fixing frames, and the positions of the closure seams of the three pile legs are all arranged at the position 1.5 meters above the common pile fixing frames; the pile legs of the upper, middle and lower sections are arranged on the pile winding and fixing frame, and the closure seam positions are respectively arranged at the position 1.5 meters above the top of the pile winding and fixing frame and the position 1.5 meters above the A-shaped frame platform of the pile winding crane.
3. The offshore joining process of an offshore wind power installation platform lifting system according to claim 1, characterized in that: in the step (1), the diameter of the cylinder body of each pile leg is 3600mm, the roundness deviation is not more than 2mm, the full-length winding degree is not more than 30mm, and the length deviation is not more than 50 mm.
4. The offshore joining process of an offshore wind power installation platform lifting system according to claim 1, characterized in that: in the step (3), the bolt boxes near the folding openings of the pile legs are not installed.
5. The offshore joining process of an offshore wind power installation platform lifting system according to claim 1, characterized in that: in the step (4), when the main hull of the platform is arranged on the slipway, the base line of the main hull of the platform is ensured to be parallel to the horizontal plane; the gap between the uppermost end of the pile shoe and the bottom plate of the slipway at the corresponding position is 300 mm; the central line of the cylinder body of the pile shoe is superposed with the central line of the pile well subsection cylinder body of the main ship body, and the levelness of the upper opening of the cylinder body of the pile shoe is not more than 2 mm.
6. The offshore joining process of an offshore wind power installation platform lifting system according to claim 1, characterized in that: in the step (6), the cross-shaped target is made of channel steel, and after the sample punching is performed, the channel steel is uniformly distributed at 90 degrees around the pile well subsection barrel of the main hull, and is arranged on the side wall and the top of the common pile fixing frame and the pile winding pile fixing frame.
7. The offshore joining process of an offshore wind power installation platform lifting system according to claim 1, characterized in that: in the step (6), the deviation between the central line of the cylinder of the common pile fixing frame or the pile winding pile fixing frame and the central line of the pile well subsection cylinder of the main hull is not more than 5mm, and the folding position is ensured to be in a horizontal state.
8. The offshore joining process of an offshore wind power installation platform lifting system according to claim 1, characterized in that: in the step (7), after the pre-closing tool of the previous pile leg is locked, the upper and lower sections of the pile leg are closed by spot welding, the hook of the heavy lift ship can be released after spot welding, the closing and hoisting operation of the next pile leg is carried out, and meanwhile, the welding operation of the upper and lower sections of the previous pile leg can be continued.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911365983.8A CN111188324A (en) | 2019-12-26 | 2019-12-26 | Overwater folding process for offshore wind power installation platform lifting system |
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| CN201911365983.8A CN111188324A (en) | 2019-12-26 | 2019-12-26 | Overwater folding process for offshore wind power installation platform lifting system |
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| CN111188324A true CN111188324A (en) | 2020-05-22 |
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| CN201911365983.8A Pending CN111188324A (en) | 2019-12-26 | 2019-12-26 | Overwater folding process for offshore wind power installation platform lifting system |
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| CN113815810A (en) * | 2021-09-29 | 2021-12-21 | 广州黄船海洋工程有限公司 | Overwater installation method of angle-bearing pile-winding crane |
| CN114368460A (en) * | 2021-12-29 | 2022-04-19 | 中船澄西扬州船舶有限公司 | Method for mounting middle support of liquid cargo pump pipe column |
| CN114872857A (en) * | 2022-05-09 | 2022-08-09 | 大连中远海运重工有限公司 | Water gathering and butt-jointing method for large-scale floating dock |
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Application publication date: 20200522 |