CN110965804B - Method for dismantling offshore wind power jacket foundation - Google Patents
Method for dismantling offshore wind power jacket foundation Download PDFInfo
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- CN110965804B CN110965804B CN201911311001.7A CN201911311001A CN110965804B CN 110965804 B CN110965804 B CN 110965804B CN 201911311001 A CN201911311001 A CN 201911311001A CN 110965804 B CN110965804 B CN 110965804B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 209
- 239000010959 steel Substances 0.000 claims abstract description 209
- 238000005520 cutting process Methods 0.000 claims abstract description 143
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 91
- 230000007704 transition Effects 0.000 claims abstract description 56
- 238000005086 pumping Methods 0.000 claims abstract description 23
- 238000010276 construction Methods 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000010802 sludge Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000013535 sea water Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 12
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 241000237502 Ostreidae Species 0.000 description 2
- 235000020636 oyster Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
- E02B2017/0052—Removal or dismantling of offshore structures from their offshore location
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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Abstract
The invention relates to the technical field of offshore wind power engineering, and discloses a method for dismantling an offshore wind power jacket foundation, which comprises the steps of construction preparation, dismantling of a transition section diagonal brace, dismantling of a transition section, dismantling of a steel platform, dismantling of a reinforcing support piece, dismantling of the upper part of a steel pipe pile, dismantling of the lower part of the steel pipe pile and the like, wherein the steps of sectioning and layered dismantling from top to bottom are adopted, so that the type selection of ship equipment by construction is more flexible, and the dependence on large-scale special equipment is avoided; and the sectional hoisting points are arranged, so that the underwater steel pipe pile for safety accidents caused by unbalance in the dismantling process is prevented from being cut in a mode of firstly pumping mud and then cutting the steel pipe pile, and the finished precision requirement and navigation requirement of a sea area are guaranteed; the potential safety hazard in the jacket foundation dismantling process can be avoided, the dismantling process precision is accurately controlled, and the normal operation and safe navigation of the wind power plant during and after dismantling are guaranteed.
Description
Technical Field
The invention relates to the technical field of offshore wind power engineering, in particular to a method for dismantling an offshore wind power jacket foundation.
Background
The jacket foundation is one of the main structural types of offshore wind turbine foundations, and in the operation process of an offshore wind farm, if the jacket foundation is damaged or reaches the design period, the jacket foundation needs to be dismantled. At present, the jacket foundation is still not dismantled in the offshore wind power construction period in China.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for dismantling a jacket foundation of offshore wind power, and the jacket foundation can be safely dismantled by using the method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for dismantling an offshore wind power jacket foundation comprises the following steps of forming the offshore wind power jacket foundation by at least two steel pipe piles, the steel pipe pile comprises a steel pipe vertical pile and a steel pipe inclined pile arranged at the upper end of the steel pipe vertical pile, the lower end of the steel pipe vertical pile is inserted into the sludge at the sea bottom, at least one reinforcing support piece is arranged between every two adjacent steel pipe inclined piles, the reinforcing support piece is X-shaped, two joints at one side of the reinforcing support piece are connected with one steel pipe inclined pile, two joints at the other side of the reinforcing support are connected with adjacent steel pipe inclined piles, a steel platform is arranged at the top end of each steel pipe pile, the steel platform is connected with the top ends of all the steel pipe inclined piles, a transition section is arranged above the steel platform, the transition section is provided with at least one transition section inclined strut along the circumferential direction, the top end of the transition section inclined strut is connected with the transition section, and the bottom end of the transition section inclined strut is connected with the steel platform; the process of removing the jacket foundation comprises the following steps: s01, construction preparation: a crane ship and a cargo ship for transporting the demolished part reach a predetermined point near a construction site and are prepared for hoisting; s02, dismantling the inclined strut of the transition section: cutting a hoisting hole on the inclined strut of the transition section, respectively cutting the top and the bottom of the inclined strut of the transition section and hanging a steel wire rope, after the cutting is finished, hoisting the inclined strut of the transition section by a crane ship through the steel wire rope, and placing the inclined strut of the transition section on a cargo ship; s03, dismantling the transition section: cutting a hoisting hole on the transition section, hanging a steel wire rope on the hoisting hole, cutting the bottom of the transition section, hoisting the transition section by the crane ship through the steel wire rope after the cutting is finished, and placing the transition section on the cargo ship; s04, dismantling the steel platform: welding a hoisting point on the steel platform, hanging a steel wire rope on the hoisting point, cutting the joint of the steel platform and the steel pipe pile, hoisting the steel platform by the crane ship through the steel wire rope after cutting, and placing the steel platform on the cargo ship; s05, dismantling the reinforcing support piece: welding lifting lugs at preset positions of the reinforcing support piece, hanging steel wire ropes, cutting two joints at the lower part of the reinforcing support piece, cutting two joints at the upper part of the reinforcing support piece, hoisting the reinforcing support piece by the crane ship through the steel wire ropes after cutting is finished, and placing the reinforcing support piece on the cargo ship; s06, dismantling the upper part of the steel pipe pile: cutting a hoisting hole in the upper part of the steel pipe pile, hanging a steel wire rope in the hoisting hole, cutting the steel pipe pile at a preset position in the middle of the steel pipe pile, hoisting the upper part of the steel pipe pile through the steel wire rope by a crane ship after cutting, and placing the upper part of the steel pipe pile on a cargo ship; s07, dismantling the lower part of the steel pipe pile: firstly, pumping sludge at the lower end of the steel pipe pile away until the sludge pumping depth reaches a preset depth, cutting a hoisting hole in the steel pipe pile, hanging a steel wire rope in the hoisting hole, cutting the steel pipe pile at a preset cutting position at the lower part of the steel pipe pile by using an underwater cutting robot, hoisting the lower part of the steel pipe pile by using a crane ship through the steel wire rope after the cutting is finished, and placing the lower part of the steel pipe pile on a cargo ship; and S08, finishing the dismantling.
As an improvement of the above technical solution, in step S02, a hoisting hole is cut at the top of the transition section diagonal brace, the top of the transition section diagonal brace is cut first, then the steel wire rope is hung, and then the bottom of the transition section diagonal brace is cut.
As an improvement of the above technical solution, in step S03, when cutting the bottom of the transition section, at least two persons perform the cutting operation at the same time.
As an improvement of the above technical solution, in step S04, when cutting the joints between the steel platform and the steel pipe piles, there are persons performing cutting work inside each steel pipe pile, and all the persons perform cutting work on the joints between the steel platform and the steel pipe piles at the same time, and when cutting the joints to the last joint, all the persons perform cutting with time shift.
As a modification of the above technical solution, in step S05, when removing the reinforcing brace located above the sea level, in the process of cutting the two joints at the upper part of the reinforcing brace, one person is left to perform work when the remaining last connecting part needs to be cut.
As a modification of the above technical solution, in step S05, when removing the reinforcing support with the upper part above sea level and the lower part below sea level, the method specifically comprises the following steps: s051a, welding lifting lugs at preset positions of the reinforcing supporting pieces; s052a, cleaning organisms on two joints at the lower part of the reinforcing support part by a diver underwater; s053a, a diver underwater cuts two joints at the lower part of the reinforcing support piece; s054a, hanging a steel wire rope on a lifting lug of the reinforcing support piece; s055a, cutting two joints on the upper part of the reinforcing support piece on water when the water level of the seawater is lowered to a proper position; s056a, after the cutting is finished, the crane ship lifts the reinforcing support piece through a steel wire rope and places the reinforcing support piece on the cargo ship.
As a modification of the above technical solution, in step S05, when removing the reinforcing support below the sea level, the method specifically includes the following steps: s051b, cutting a hoisting hole at a preset position on the reinforcing support by a diver; s052b, cleaning organisms on four joints of the reinforcing support part by a diver underwater; s053b, cutting two joints at the lower part of the reinforcing support part underwater by a diver; s054b, hanging a steel wire rope at a hoisting hole of the reinforcing support piece; s055b, cutting two joints at the upper part of the reinforcing support part by a diver underwater; s056b, after the cutting is finished, the crane ship lifts the reinforcing support piece through the steel wire rope and places the reinforcing support piece on the cargo ship.
As an improvement of the above technical solution, in step S06, the predetermined cutting position of the middle part of the steel pipe pile is on water, and when the steel pipe pile is cut, one person is left to perform the operation when the last connecting part is left to be cut.
As an improvement of the above technical solution, in step S07, the concrete step of pumping away the sludge at the lower end of the steel pipe pile is: arranging the mud pumping equipment on a deck of a crane ship, connecting pipelines, lowering a mud pumping pipe by using a lifting hook of the crane ship, pumping mud at the lower end of the steel pipe pile by using a mud pumping pump, stopping pumping mud, and measuring the depth of a mud pit after the completion of back silting until the depth of the mud pit reaches a preset value.
As an improvement of the above technical solution, in step S07, the concrete steps of cutting the steel pipe pile using the underwater cutting robot are as follows: the underwater cutting robot is lifted by a crane ship through a lifting hook and is lifted to the upper side of the steel pipe vertical piles, the underwater cutting robot is slowly lowered at a position outside the space surrounded by the four steel pipe vertical piles, after the underwater cutting robot enters water, an operator observes the distance between the underwater cutting robot and the steel pipe vertical piles through a camera of the underwater cutting robot, the position of the underwater cutting robot is adjusted on the crane ship through adjusting the position of the lifting hook, the underwater cutting robot is slowly lowered to a cutting position along the outer walls of the steel pipe vertical piles, a pile holding arm is closed by the underwater cutting robot, a steel wire rope is hung in a lifting hole, and the underwater cutting robot cuts the lower parts of the steel pipe vertical piles.
The invention has the following beneficial effects:
the method for dismantling the offshore wind power jacket foundation adopts the step-by-step and layered dismantling from top to bottom, so that the volume of parts dismantled in each step is greatly reduced, the model selection of ship-plane equipment by the dismantling construction is more flexible, and the dependence on large-scale special equipment is avoided; the length of the segments is reasonably divided according to the model of the equipment, the weight of the segments is controlled, and the dismantling difficulty is reduced; and the sectional hoisting points are reasonably arranged, so that safety accidents caused by unbalance in the dismantling process are prevented; the underwater steel pipe pile is cut in a mode of firstly pumping mud and then cutting the steel pipe pile, so that the finished precision requirement and the navigation requirement of a sea area are guaranteed; the potential safety hazard in the jacket foundation dismantling process can be avoided, the dismantling process precision is accurately controlled, and the normal operation and safe navigation of the wind power plant during and after dismantling are guaranteed.
Drawings
The invention is further described with reference to the following detailed description of embodiments and drawings, in which:
FIG. 1 is a schematic structural view of a jacket foundation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the position of the cutting line in step S02 according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of the embodiment of the present invention after step S02 is completed;
FIG. 4 is a schematic diagram illustrating the position of the cutting line in step S03 according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram illustrating the completion of step S03 according to the embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the position of the cutting line in step S04 according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram illustrating the completion of step S04 according to the embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating the position of the cutting line in step S05 according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram illustrating the completion of step S05 according to an embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating the position of the cutting line in step S06 according to an embodiment of the present invention;
FIG. 11 is a schematic structural diagram illustrating the completion of step S06 according to an embodiment of the present invention;
fig. 12 is a schematic diagram illustrating the position of the mud pumping in step S07 according to the embodiment of the present invention;
fig. 13 is a schematic diagram of the position of the cutting line in step S07 in the embodiment of the present invention.
Detailed Description
Referring to fig. 1 to 13, in this embodiment, the offshore wind power jacket foundation includes four steel pipe piles 1 arranged in a rectangular shape, each steel pipe pile 1 includes a steel pipe vertical pile 11 and a steel pipe inclined pile 12 arranged at an upper end of the steel pipe vertical pile 11, a lower end of each steel pipe vertical pile 11 is inserted into the silt in the sea bottom, at least one reinforcing support member 2 is arranged between two adjacent steel pipe inclined piles 12, each reinforcing support member 2 is in an X shape, two joints 21 on one side of each reinforcing support member 2 are connected with one steel pipe inclined pile 12, two joints 21 on the other side of each reinforcing support member 2 are connected with the adjacent steel pipe inclined pile 12, a steel platform 3 is arranged at a top end of each steel pipe pile 1, the steel platform 3 is connected with top ends of the four steel pipe inclined piles 12, a transition section 4 is vertically arranged above the steel platform 3, and four transition section inclined struts 5 are arranged on the transition section 4 along the circumferential direction, a steel-pipe pile 1 corresponds a changeover portion bracing 5, and changeover portion 4 is connected on the top of changeover portion bracing 5, and steel platform 3 is connected to the bottom of changeover portion bracing 5. After the jacket foundation is installed in the sea, the relative positions of the reinforcing support 2 and the sea level are three types: the whole reinforcing support 2 is located above sea level; the upper part of the reinforcing support 2 is located above sea level and the lower part is located below sea level, and at high tide, seawater may flood the upper part of the reinforcing support 2; the entire reinforcing support 2 is located below sea level.
The invention discloses a method for dismantling an offshore wind power jacket foundation, which comprises the following steps:
s01, construction preparation: the crane ship, the cargo ship transporting the demolished part, arrives at a predetermined point near the construction site and is ready for hoisting.
S02, dismantling the inclined strut 5 of the transition section: the hoisting hole 6 is cut at the top of the inclined strut of the transition section, the top of the inclined strut of the transition section is cut firstly, then the steel wire rope is hung, then the bottom of the inclined strut of the transition section is cut, and after the cutting is finished, the crane ship lifts the inclined strut 5 of the transition section through the steel wire rope and places the inclined strut 5 of the transition section on the cargo ship.
S03, dismantling the transition section 4: cutting a hoisting hole 6 at the top of the transition section 4, hanging a steel wire rope in the hoisting hole 6, cutting the bottom of the transition section 4 by four persons at the same time, leaving only one person for cutting when the last connecting part is cut, after the cutting is finished, hoisting the transition section 4 by the crane ship through the steel wire rope, and placing the transition section 4 on a cargo ship.
S04, dismantling the steel platform 3: welding a hoisting point 31 on the steel platform 3, hanging a steel wire rope on the hoisting point 31, cutting the joint of the steel platform 3 and the steel pipe pile 1, cutting the four joints inside the steel pipe pile 1 by four persons at the four joints of the steel platform 3 and the steel pipe pile 1 respectively, cutting by the four persons at different time when the last joint is cut, hoisting the steel platform 3 by the crane ship through the steel wire rope after the cutting is finished, and placing the steel platform 3 on a cargo ship; since the steel-pipe pile 1 is a hollow steel pipe, a cutting operation can be performed inside the steel-pipe pile 1.
S05, dismantling the reinforcing support piece 2: welding a lifting lug 22 at a preset position of the reinforcing support member 2, hanging a steel wire rope, cutting two joints 21 at the lower part of the reinforcing support member 2, cutting two joints 21 at the upper part of the reinforcing support member 2, hoisting the reinforcing support member 2 by a crane ship through the steel wire rope after cutting, and placing the reinforcing support member 2 on a cargo ship;
specifically, when removing the reinforcing brace 2 located above sea level, a plurality of persons cut simultaneously in the process of cutting the two joints 21 at the upper portion of the reinforcing brace 2, and one person is left to work when the remaining final joint portion needs to be cut.
Correspondingly, when dismantling the reinforcing support 2 with the upper part above sea level and the lower part below sea level, the following steps are carried out: s051a, welding lifting lugs 22 at preset positions of the reinforcing support pieces 2; s052a, a diver cleans organisms such as oyster on two joints 21 at the lower part of the reinforcing support part 2 underwater; s053a, a diver underwater cuts two joints 21 at the lower part of the reinforcing support piece 2; s054a, hanging a steel wire rope on a lifting lug 22 of a reinforcing support piece 2, specifically, firstly installing a shackle on the lifting lug 22, and then installing the steel wire rope on the shackle; s055a, when the water level of the seawater is lowered to a proper position, cutting the two joints 21 on the upper portion of the reinforcing support piece 2 on the water, simultaneously cutting by multiple persons, and when the remaining last connecting portion needs to be cut, leaving one person for operation; s056a. after the cutting is completed, the crane ship lifts the reinforcing support 2 by means of the wire rope and places the reinforcing support 2 on the cargo ship. The influence of the tide level on the construction is fully utilized, the reasonable tide level is selected to cut the two joints 21 at the upper part of the reinforcing support piece 2, the underwater operation is changed into the overwater operation, the construction difficulty is reduced, and the resources are saved.
Likewise, when dismantling the reinforcing support 2 located below sea level, the following steps are carried out: s051b, a diver cuts a hoisting hole at a preset position on the reinforcing support piece 2; s052b, cleaning organisms such as oyster on four joints 21 of the reinforcing support piece 2 by a diver underwater; s053b, cutting two joints 21 at the lower part of the reinforcing support piece 2 by a diver underwater; s054b, hanging a steel wire rope at a hoisting hole of the reinforcing support piece 2; s055b. the diver underwater cuts the two joints 21 at the upper part of the reinforcing support 2; s056b. after the cutting is completed, the crane ship lifts the reinforcing support 2 by means of the wire rope and places the reinforcing support 2 on the cargo ship.
S06, dismantling the upper part of the steel pipe pile 1: cutting a hoisting hole 6 at the top of the steel pipe inclined pile 12, hanging a steel wire rope in the hoisting hole 6, cutting the steel pipe inclined pile 12 at a preset position in the middle of the steel pipe inclined pile 12, simultaneously cutting by a plurality of persons, leaving one person for operation when the remaining last connecting part needs to be cut, hoisting the upper part of the steel pipe inclined pile 12 by a crane ship through the steel wire rope after the cutting is finished, and placing the upper part of the steel pipe inclined pile 12 on a cargo ship; wherein the preset cutting position of the middle part of the steel pipe batter pile 12 is on water.
S07, dismantling the lower part of the steel pipe pile 1: the method comprises the steps of firstly, taking sludge at the lower end of a steel pipe vertical pile 11 away until the sludge reaches a preset sludge taking depth, cutting a hoisting hole 6 in a steel pipe inclined pile 12, hanging a steel wire rope in the hoisting hole 6, cutting the steel pipe vertical pile 11 at a preset cutting position at the lower part of the steel pipe vertical pile 11 by using an underwater cutting robot, hoisting the lower part of the steel pipe pile 1 by a crane ship through the steel wire rope after cutting, and placing the lower part of the steel pipe pile 1 on a cargo ship.
Specifically, the concrete steps of pumping out the sludge at the lower end of the steel pipe vertical pile 11 are as follows: arranging the mud pumping equipment on a deck of a crane ship, connecting a pipeline, lowering a mud pumping pipe by using a lifting hook of the crane ship, pumping mud at the lower end of the steel pipe vertical pile 11 by using a mud pumping pump, stopping pumping mud, and measuring the depth of the mud pit 7 after the back silting is finished until the depth of the mud pit 7 reaches a preset value.
Further, the specific steps of cutting the steel pipe vertical pile 11 by using the underwater cutting robot are as follows: the underwater cutting robot is hoisted by a crane ship through a lifting hook to be lifted above the steel pipe vertical piles 11, the underwater cutting robot is slowly lowered at a position outside a space surrounded by the four steel pipe vertical piles 11, after the underwater cutting robot enters water, an operator observes the distance between the underwater cutting robot and the steel pipe vertical piles 11 through a camera of the underwater cutting robot, the position of the underwater cutting robot is adjusted by adjusting the position of the lifting hook on the crane ship, the underwater cutting robot is kept to be slowly lowered to a cutting position along the outer walls of the steel pipe vertical piles 11, a pile holding arm is closed by the underwater cutting robot, the position is fixed, a hoisting steel wire rope is hung in a hoisting hole 6, and the underwater cutting robot cuts the lower parts of the steel pipe vertical piles 11. The underwater cutting robot is slowly lowered out of the space surrounded by the four steel pipe vertical piles 11, and the underwater cutting robot is mainly prevented from being damaged due to collision with the steel pipe vertical piles 11.
And S08, finishing the dismantling.
Specifically, when the overwater operation, particularly the high-altitude operation is completed, a temporary operation platform is built at an operation position, so that the high-altitude operation is deck operation. Within the allowed performance range of ship and aircraft equipment, the method is reasonable and integrated, and enables the overwater operation and the high-altitude operation to be deck operation, thereby reducing the construction safety risk. After the steel wire ropes are hung, the underwater operation on water adopts a cutting mode of simultaneous operation at multiple points, and finally, one part is left for retracting the cutter, so that safety accidents caused by the fact that the steel structure is in a unstable state for too long time are prevented. During the cutting process, the crane ship is adjusted to enable the steel wire rope to be in a tightened but unstressed state, and meanwhile, two guy cables are pulled on the opposite side.
The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the above embodiments, and the present invention shall fall within the protection scope of the present invention as long as the technical effects of the present invention are achieved by any similar or identical means.
Claims (10)
1. A method for dismantling an offshore wind power jacket foundation is characterized by comprising the following steps: the offshore wind power jacket foundation comprises at least two steel pipe piles (1), each steel pipe pile (1) comprises a steel pipe vertical pile (11) and a steel pipe inclined pile (12) arranged at the upper end of the steel pipe vertical pile (11), the lower end of each steel pipe vertical pile (11) is inserted into silt at the sea bottom, at least one reinforcing support piece (2) is arranged between every two adjacent steel pipe inclined piles (12), each reinforcing support piece (2) is X-shaped, two joints (21) on one side of each reinforcing support piece (2) are connected with one steel pipe inclined pile (12), two joints (21) on the other side of each reinforcing support piece (2) are connected with the adjacent steel pipe inclined piles (12), a steel platform (3) is arranged at the top end of each steel pipe pile (1), the steel platform (3) is connected with the top ends of all the steel pipe inclined piles (12), and a transition section (4) is arranged above each steel platform (3), the transition section (4) is provided with at least one transition section inclined strut (5) along the circumferential direction, the top end of the transition section inclined strut (5) is connected with the transition section (4), and the bottom end of the transition section inclined strut (5) is connected with the steel platform (3);
the process of removing the jacket foundation comprises the following steps:
s01, construction preparation: a crane ship and a cargo ship for transporting the demolished part reach a predetermined point near a construction site and are prepared for hoisting;
s02, dismantling the inclined strut (5) of the transition section: cutting hoisting holes (6) in the inclined strut (5) of the transition section, respectively cutting the top and the bottom of the inclined strut (5) of the transition section and hanging a steel wire rope, after the cutting is finished, hoisting the inclined strut (5) of the transition section by a crane ship through the steel wire rope, and placing the inclined strut (5) of the transition section on a cargo ship;
s03, dismantling the transition section (4): cutting a hoisting hole (6) in the transition section (4), hanging a steel wire rope in the hoisting hole (6), cutting the bottom of the transition section (4), hoisting the transition section (4) by the crane ship through the steel wire rope after cutting, and placing the transition section (4) on a cargo ship;
s04, dismantling the steel platform (3): welding a hoisting point (31) on the steel platform (3), hanging a steel wire rope on the hoisting point (31), cutting the joint of the steel platform (3) and the steel pipe pile (1), hoisting the steel platform (3) by the crane ship through the steel wire rope after cutting, and placing the steel platform (3) on the cargo ship;
s05, dismantling the reinforcing support piece (2): welding lifting lugs (22) at preset positions of the reinforcing support piece (2), hanging steel wire ropes, cutting two joints (21) at the lower part of the reinforcing support piece (2) at first, then cutting two joints (21) at the upper part of the reinforcing support piece (2), hoisting the reinforcing support piece (2) through the steel wire ropes by a crane ship after cutting is completed, and placing the reinforcing support piece (2) on a cargo ship;
s06, dismantling the upper part of the steel pipe pile (1): cutting a hoisting hole (6) in the upper part of the steel pipe pile (1), hanging a steel wire rope in the hoisting hole (6), cutting the steel pipe pile (1) at a preset position in the middle of the steel pipe pile (1), hoisting the upper part of the steel pipe pile (1) by a crane ship through the steel wire rope after cutting, and placing the upper part of the steel pipe pile (1) on a cargo ship;
s07, dismantling the lower part of the steel pipe pile (1): firstly, sludge at the lower end of a steel pipe pile (1) is pumped away until a preset sludge pumping depth is reached, a hoisting hole (6) is cut in the steel pipe pile (1), a steel wire rope is hung in the hoisting hole (6), then an underwater cutting robot is used for cutting the steel pipe pile (1) at a preset cutting position at the lower part of the steel pipe pile (1), after cutting is completed, a crane ship lifts the lower part of the steel pipe pile (1) through the steel wire rope, and the lower part of the steel pipe pile (1) is placed on a cargo ship;
and S08, finishing the dismantling.
2. The offshore wind power jacket foundation demolition method according to claim 1, characterized in that: in the step S02, a hoisting hole (6) is cut at the top of the inclined strut of the transition section, the top of the inclined strut of the transition section is cut firstly, then the steel wire rope is hung, and then the bottom of the inclined strut of the transition section is cut.
3. The offshore wind power jacket foundation demolition method according to claim 1, characterized in that: in step S03, when the bottom of the transition section is cut, at least two persons perform the cutting operation at the same time.
4. The offshore wind power jacket foundation demolition method according to claim 1, characterized in that: in the step S04, when cutting the joint between the steel platform (3) and the steel pipe pile (1), a person performing cutting work is present inside each steel pipe pile (1), all the persons perform cutting work on the joint between the steel platform (3) and the steel pipe pile (1) at the same time, and when the joint is cut to the last joint, all the persons perform cutting work with time being staggered.
5. The offshore wind power jacket foundation demolition method according to claim 1, characterized in that: in step S05, when removing the reinforcing brace (2) located above sea level, in cutting the two joints (21) at the upper part of the reinforcing brace (2), one person is left to work when the remaining last joint needs to be cut.
6. The offshore wind power jacket foundation demolition method according to claim 1, characterized in that: in step S05, when removing the reinforcing support (2) with the upper part above sea level and the lower part below sea level, the following steps are specifically carried out:
s051a, welding lifting lugs (22) at preset positions of the reinforcing support pieces (2);
s052a, cleaning organisms on two joints (21) at the lower part of the reinforcing support piece (2) by a diver underwater;
s053a, cutting two joints (21) at the lower part of the reinforcing support piece (2) by a diver underwater;
s054a, hanging a steel wire rope on a lifting lug (22) of the reinforcing support piece (2);
s055a, cutting two joints (21) at the upper part of the reinforcing support piece (2) on the water when the water level of the seawater is lowered to a proper position;
s056a, after cutting, the crane ship lifts the reinforcing support piece (2) through a steel wire rope, and the reinforcing support piece (2) is placed on the cargo ship.
7. The offshore wind power jacket foundation demolition method according to claim 1, characterized in that: in step S05, when removing the reinforcing support (2) below sea level, the following steps are specifically carried out:
s051b, cutting a hoisting hole at a preset position on the reinforcing support piece (2) by a diver;
s052b, cleaning organisms on four joints (21) of the reinforcing support piece (2) by a diver underwater; s053b, cutting two joints (21) at the lower part of the reinforcing support piece (2) by a diver underwater;
s054b, hanging a steel wire rope at a hoisting hole of the reinforcing support piece (2);
s055b, cutting two joints (21) at the upper part of the reinforcing support piece (2) by a diver underwater;
s056b, after the cutting is finished, the crane ship lifts the reinforcing support piece (2) through the steel wire rope, and the reinforcing support piece (2) is placed on the cargo ship.
8. The offshore wind power jacket foundation demolition method according to claim 1, characterized in that: in step S06, the steel pipe pile (1) is cut with the predetermined cutting position in the middle of the steel pipe pile (1) on water, and one person is left to perform the work when the last connecting portion is left to be cut.
9. The offshore wind power jacket foundation demolition method according to claim 1, characterized in that: in step S07, the concrete step of removing the sludge at the lower end of the steel pipe pile (1) is: arranging the mud pumping equipment on a deck of a crane ship, connecting pipelines, lowering a mud pumping pipe by using a lifting hook of the crane ship, pumping mud at the lower end of the steel pipe pile (1) by using a mud pumping pump, stopping pumping mud, and measuring the depth of a mud pit (7) after the back silting is finished until the depth of the mud pit (7) reaches a preset value.
10. A method of dismantling an offshore wind power jacket foundation according to claim 1 or 9, characterised in that: in step S07, the concrete steps of cutting the steel pipe pile (1) using the underwater cutting robot are: the underwater cutting robot is hoisted to the upper side of the steel pipe vertical pile (11) by the crane ship through a lifting hook, the underwater cutting robot is slowly lowered to a position outside a space surrounded by the four steel pipe vertical piles (11), after the underwater cutting robot enters water, an operator observes the distance between the underwater cutting robot and the steel pipe vertical pile (11) through a camera of the underwater cutting robot, the position of the underwater cutting robot is adjusted on the crane ship through adjusting the position of the lifting hook, the underwater cutting robot is slowly lowered to a cutting position along the outer wall of the steel pipe vertical pile (11), the underwater cutting robot closes a pile holding arm, a steel wire rope is hung in a hoisting hole (6), and the underwater cutting robot cuts the lower part of the steel pipe vertical pile (11).
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| CN113047285A (en) * | 2021-04-01 | 2021-06-29 | 保利长大工程有限公司 | Method for dismantling jacket foundation of offshore wind turbine |
| CN113086868B (en) * | 2021-04-27 | 2024-04-19 | 中交第三航务工程局有限公司 | Method for cutting off ultrahigh part of offshore wind power large-diameter single pile foundation |
| CN114439008B (en) * | 2021-12-09 | 2024-04-12 | 天津大学 | Dismantling method of offshore wind power Y-type single-tube jacket foundation |
| CN114875909B (en) * | 2022-07-05 | 2022-09-09 | 华电曹妃甸重工装备有限公司 | Offshore wind power jacket positioning pile construction method |
| CN115218038B (en) * | 2022-07-06 | 2023-11-24 | 山东中铁路桥工程有限公司 | Deep buried oil pipeline dismantling method and spliced floating gantry ship |
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| CN105200970B (en) * | 2015-08-31 | 2017-04-19 | 中国海洋石油总公司 | Method for dismantling discarded jacket through air bags |
| CN109024660B (en) * | 2018-07-17 | 2020-12-15 | 中国能源建设集团广东省电力设计研究院有限公司 | Pile foundation dismantling method for offshore foundation and offshore foundation dismantling method |
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