CN105756081A - Self-tapered end prestress wire circular truncated cone concrete drum offshore wind turbine foundation and construction method thereof - Google Patents

Self-tapered end prestress wire circular truncated cone concrete drum offshore wind turbine foundation and construction method thereof Download PDF

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Publication number
CN105756081A
CN105756081A CN201610292510.XA CN201610292510A CN105756081A CN 105756081 A CN105756081 A CN 105756081A CN 201610292510 A CN201610292510 A CN 201610292510A CN 105756081 A CN105756081 A CN 105756081A
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China
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cylinder
self
locking head
prestress wire
pipe
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CN201610292510.XA
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Chinese (zh)
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CN105756081B (en
Inventor
马逸鹄
梁峰
张明熠
杨州
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江苏金海新能源科技有限公司
内蒙古金海新能源科技股份有限公司
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Priority to CN201610292510.XA priority Critical patent/CN105756081B/en
Publication of CN105756081A publication Critical patent/CN105756081A/en
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Publication of CN105756081B publication Critical patent/CN105756081B/en

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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/44Foundations for machines, engines or ordnance

Abstract

The invention discloses a self-tapered end prestress wire circular truncated cone concrete drum offshore wind turbine foundation and a construction method thereof. The self-tapered end prestress wire circular truncated cone concrete drum offshore wind turbine foundation comprises a tower drum (1), wherein the tower drum (1) is connected with a ring beam (12) through a prestress anchor bolt (2); the ring beam (12) is located at the top of a barrel (5); a prestress wire (3) is arranged in the wall of the barrel (5); the upper end of the prestress wire (3) is connected with an end-enclosed short column (13); a platform guardrail (14) is pre-buried in the end-enclosed short column (13); a bottom plate (6) is mounted at the bottom of the barrel (5); a grouting material (8) is poured at the bottom of the bottom plate (6); a sealed water pipe (7) is clamped at the lower part of the bottom plate (6); a shroud ring (15) is welded to the inner wall of the barrel (5); a self-tapered end anchor rod (10) is anchored in an anchor eye (9) in the lower end of the prestress wire (3). The self-tapered end prestress wire circular truncated cone concrete drum offshore wind turbine foundation is reasonable in structural design, stable in construction process, high in efficiency, low in cost, strong in operability and good in safety, and can be used for carrying out construction in deep sea areas which are about 20 meters deep.

Description

Self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation and construction method thereof
Technical field
The present invention relates to a kind of offshore wind power foundation, particularly to a kind of self-locking head prestress wire truncated cone-shaped concrete cylinder offshore wind turbine foundation that can be used for about 20m depth of water rock foundation and construction method thereof.
Background technology
The load environment of offshore wind turbine is special and complicated, existing several offshore foundation forms in world wide, mostly there is construction difficulty, high in cost of production problem.It is thus desirable to research and development cost is less expensive, the blower foundation form of easy construction, also there is not ripe effective solution for the area, deep-sea of the depth of water about 20 meters at present.
Summary of the invention
Goal of the invention: it is an object of the invention to overcome the deficiencies in the prior art, a kind of reasonable in design is provided, easy to operate, can the self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation of self-floating towing, another object of the present invention is to provide the construction method of this self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation.Self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation provided by the invention can drag floating navigation, is applied in gravity type foundation by prestressed rock anchor head, to reduce key dimension and weight, can be applicable to area, the deep-sea of about 20 meters.
Technical scheme: in order to realize object above, the technical scheme that the present invention takes is:
A kind of self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, it includes tower, tower is connected on ring beam by prestressed bolt, ring beam is positioned at cylinder top, prestress wire it is provided with in barrel wall, prestress wire upper end is connected with end socket short column, platform guardrail is embedded on end socket short column, cylinder body bottom is provided with base plate, grouting material has been built bottom base plate, sealing water pipe and be stuck in base plate bottom, cylinder inboard wall is welded with garter spring, self-locking head is anchor rod anchored in the anchor hole of prestress wire lower end;
Being provided with gas cell in described cylinder, gas cell periphery is enclosed with netting, and netting is connected fixing with garter spring;
Cylinder is connected with the hydraulic rockshaft being arranged on girder steel, and girder steel is connected with fife, and fife is connected with floating drum;
Described cylinder top is provided with base roof plate, and prestressed bolt lower end is connected on base roof plate, and base roof plate center offers the circular hole that gas cell takes out.
The some preformed holes of tower annular distribution.Preformed hole can penetrate water cutter in the construction stage and clean sea bed and basis faying face;Penetrate Grouting Pipe to slip casting between the bottom of foundation and sea bed;Bore bolthole, be inserted from tapered end steel strand wires and sleeve pipe;Stretch-draw expands self-locking head, to slip casting bottom anchor pole, rotates and takes out sleeve pipe.
Preferably, above-described self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, described self-locking head anchor pole includes self-locking head round platform nut, self-locking head overcoat, short tube with holes, ring for fixing, water shutoff plate, tool-type push pipe and PVC madjack pipe;Self-locking head round platform nut, self-locking head overcoat and short tube with holes are bolted;Self-locking head round platform nut is fixed on the bottom of prestress wire by ground tackle, and water shutoff plate is connected by thread segment and the short tube with holes of bottom, and the lower end of PVC madjack pipe penetrates in the hole that water shutoff plate is reserved fixing;Tool-type push pipe is positioned at short tube top with holes, and tool-type push pipe is concentric with short tube with holes by ring for fixing.
Preferably, above-described self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, described girder steel is 4, constitute rectangle, being provided with 2 hydraulic rockshafts on every girder steel, every girder steel connects a fife, and every fife connects a floating drum.
The construction method of a kind of self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, comprises the following steps:
A, on dock support mould, assembling reinforcement, then bury in mould and bury cylinder following peripheral from top to bottom successively underground and seal the built-in fitting of water pipe, the built-in fitting of leveling support, the built-in fitting of netting garter spring, the lower anchor slab of prestressed bolt (2) and sleeve pipe, then successively disturbing concrete, maintenance, form removal;
B, at drum surface, leveling support and becket bridle are installed, and do paint protection, then the sealing water pipe of cylinder following peripheral is installed, seal and below water pipe, glue one layer of foam plastics that can improve sealing, then in inner barrel, gas cell is installed, inflation, connects netting, installs 4 groups of jack, push pipe and hydraulic pipe;
C, the outside floating drum of installation, at the bottom of the cylinder of the hydraulic rockshaft connector drum on girder steel;Opening a sluice gate and drawing out some water, cylinder floats, float draft 2~3m, by ultrasonic listening seabed flatness, processes the surface, seabed of floating drum bottom with giant, washes away surface porosity out-of-flatness part;
D, being loosened downwards by the cylinder hung on floating drum by hydraulic rockshaft, sink to seabed, do not contact seabed hovering, gas cell is not exitted;
E, driving 4 push pipes by cylinder jack-up 300~400mm with jack, 60 anchor holes reserved from cylinder insert giants, and annular bottom surface place ground is washed away, and remove the rubble that loosens;
F, retraction jack, and leveling basis, until cylinder contacts with seabed and smooth, water under high pressure is filled to sealing in water pipe, the periphery gap of closed bottom, from cylinder, reserved anchor hole irrigates pea gravel concreten to cylinder body bottom, until reserved spout hole is gushed out concrete on base plate, arrive 70% design strength after maintenance, remove inner barrel gas cell, from base roof plate centre bore, take out gas cell;Except solution, floating drum and the connection of cylinder, measure the change of cylinder end face absolute altitude;
G, from end face anchor hole down rock drilling; reach micro-decomposed rock; by prestress wire and tool-type push pipe with PVC madjack pipe is integrally mounted puts in anchor hole; stretch-draw prestressing force steel strand wires are to design load 50%; making to be about on self-locking head round platform nut self-locking head overcoat backs down, and is pressed into rock anchor hole, is then pressed into grouting material in PVC madjack pipe; self-locking head round platform nut and self-locking head overcoat are protected, cylinder top circumference carries out this operation symmetrically;After grouting material reaches intensity, throw formula push pipe, it is drawn off;Complete stretch-draw prestressing force steel strand wires are to design load again, and carry out ultra stretching, and finally crimping is fixing;Basis end face absolute altitude change is measured after all anchor hole stretch-draw;
H, closing prestress wire top with C60 grouting material, and connect fixed platform guardrail, do cylinder protection at periphery geotechnique's cloth bag filling silt, inner barrel water-filling is fair with sea level height;
I. with the upper anchor slab of the levelling prestressed bolt of C80 grouting material, make level height difference within 2~3mm;Then lifting coxopodite tower stretch-draw prestressing force crab-bolt, then lift all the other superstructures, complete the installation of blower fan unit.
Compared to the prior art the present invention has the advantages that
1. self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation provided by the invention, reasonable in design, intensity is high, easy for installation, easy leveling, can self-floating towing, prestressed rock anchor head is applied in gravity type foundation, to reduce key dimension and weight, can be applicable to area, the deep-sea of about 20 meters.
2. the construction method of self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation provided by the invention, can construct in the area, deep-sea of about 20 meters, and construction technology is stable, efficiency is high, and cost is low, workable, and security performance is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation provided by the invention.
Fig. 2 is the structural representation in self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation vertical section of the present invention.
Fig. 3 is the structural representation in self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation sinking watching of the present invention.
Fig. 4 is the structural representation of self-locking head anchor pole of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, it is further elucidated with the present invention, it should be understood that these embodiments are merely to illustrate the present invention rather than restriction the scope of the present invention, after having read the present invention, the amendment of the various equivalent form of values of the present invention is all fallen within the application claims limited range by those skilled in the art.
Such as Fig. 1, Fig. 2 and and Fig. 4 shown in, a kind of self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, it is characterized in that, it includes tower (1), tower (1) is connected on ring beam (12) by prestressed bolt (2), ring beam (12) is positioned at cylinder (5) top, prestress wire (3) it is provided with in cylinder (5) wall, prestress wire (3) upper end is connected with end socket short column (13), platform guardrail (14) is embedded on end socket short column (13), cylinder (5) bottom is provided with base plate (6), grouting material (8) has been built in base plate (6) bottom, seal water pipe (7) and be stuck in base plate (6) bottom, cylinder (5) inwall is welded with garter spring (15), self-locking head anchor pole (10) is anchored in the anchor hole of prestress wire (3) lower end;
Being provided with gas cell (17) in described cylinder (5), gas cell (17) periphery is enclosed with netting (16), and netting (16) is connected fixing with garter spring (15);
Cylinder (5) is connected with the hydraulic rockshaft (25) being arranged on girder steel (27), and girder steel (27) is connected with fife (28), and fife (28) is connected with floating drum (26);
Described cylinder (5) top is provided with base roof plate (4), prestressed bolt (2) lower end is connected on base roof plate (4), and base roof plate (4) center offers the circular hole that gas cell (17) takes out.
Above-described self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, described self-locking head anchor pole (10) includes self-locking head round platform nut (18), self-locking head overcoat (19), short tube with holes (20), ring for fixing (21), water shutoff plate (22), tool-type push pipe (23) and PVC madjack pipe (24);Self-locking head round platform nut (18), self-locking head overcoat (19) and short tube with holes (20) are bolted;Self-locking head round platform nut (18) is fixed on the bottom of prestress wire (3) by ground tackle, water shutoff plate (22) is connected by thread segment and the short tube with holes (20) of bottom, and the lower end of PVC madjack pipe (24) penetrates in the hole that water shutoff plate (22) is reserved fixing;Tool-type push pipe (23) is positioned at short tube with holes (20) top, and tool-type push pipe (23) is concentric with short tube with holes (20) by ring for fixing (21).
Above-described self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, described girder steel (27) is 4, constitute rectangle, every girder steel (27) is provided with 2 hydraulic rockshafts (25), every girder steel (27) connects a fife (28), and every fife (28) connects a floating drum (26).
Embodiment 2
As shown in Figure 1 to Figure 4, the construction method of a kind of self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, it comprises the following steps:
A, on dock support mould, assembling reinforcement, then bury in mould and bury cylinder (5) following peripheral from top to bottom successively underground and seal the built-in fitting of water pipe (7), the built-in fitting of leveling support, the built-in fitting of netting garter spring (15), the lower anchor slab of prestressed bolt (2) and sleeve pipe, then successively disturbing concrete, maintenance, form removal;
B, leveling support and becket bridle are installed on cylinder (5) surface, and do paint protection, then the sealing water pipe (7) of cylinder (5) following peripheral is installed, seal water pipe (7) lower section and glue one layer of foam plastics that can improve sealing, then at cylinder (5) internally installed gas cell (17), inflation, connects netting (16), installs 4 groups of jack, push pipe and hydraulic pipe;
C, the outside floating drum (26) of installation, at the bottom of the cylinder of hydraulic rockshaft (25) connector drum (5) on girder steel (27);Opening a sluice gate and drawing out some water, cylinder (5) floats, and floating drum (5) draft 2~3m by ultrasonic listening seabed flatness, processes the surface, seabed of floating drum (5) bottom, washes away surface porosity out-of-flatness part with giant;
D, being loosened downwards by the cylinder (5) hung on floating drum (26) by hydraulic rockshaft (25), sink to seabed, do not contact seabed hovering, gas cell (17) is not exitted;
E, driving 4 push pipes by cylinder (5) jack-up 300mm with jack, 60 anchor holes reserved from cylinder (5) insert giants, and annular bottom surface place ground is washed away, and remove the rubble that loosens;
F, retraction jack, and leveling basis, until cylinder (5) contacts with seabed and smooth, water under high pressure is filled to sealing in water pipe (7), the periphery gap of closed bottom (6), from cylinder (5), reserved anchor hole irrigates pea gravel concreten to the bottom of cylinder (5), the concrete until the upper reserved spout hole of base plate (6) is gushed out, 70% design strength is arrived after maintenance, remove cylinder (5) inner inflatable capsule (17), from base roof plate (4) centre bore, take out gas cell (17);Release the connection of outside floating drum (26) and cylinder (5), measure the change of cylinder (5) end face absolute altitude;
G, from end face anchor hole down rock drilling, reach micro-decomposed rock, by prestress wire (3) and tool-type push pipe (23) with PVC madjack pipe (24) is integrally mounted puts in anchor hole, stretch-draw prestressing force steel strand wires (3) are to design load 50%, making to be about on self-locking head round platform nut (18) self-locking head overcoat (19) backs down, press-in rock anchor hole, then in PVC madjack pipe (24), it is pressed into grouting material, self-locking head round platform nut (18) and self-locking head overcoat (19) are protected, cylinder (5) top circumference carries out this operation symmetrically;After grouting material reaches intensity, throw formula push pipe (23), it is drawn off;Complete stretch-draw prestressing force steel strand wires (3) are to design load again, and carry out ultra stretching, and finally crimping is fixing;Basis end face absolute altitude change is measured after all anchor hole stretch-draw;
H, use C60 grouting material close prestress wire (3) top; and connect fixed platform guardrail (14); doing cylinder (5) protection at periphery geotechnique's cloth bag filling silt, the internal water-filling of cylinder (5) maintains an equal level with sea level height;
I. with the upper anchor slab of the levelling prestressed bolt of C80 grouting material (2), make level height difference within 2mm;Then lifting coxopodite tower stretch-draw prestressing force crab-bolt (2), then lift all the other superstructures, complete the installation of blower fan unit.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.

Claims (4)

1. a self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, it is characterized in that, it includes tower (1), tower (1) is connected on ring beam (12) by prestressed bolt (2), ring beam (12) is positioned at cylinder (5) top, prestress wire (3) it is provided with in cylinder (5) wall, prestress wire (3) upper end is connected with end socket short column (13), platform guardrail (14) is embedded on end socket short column (13), cylinder (5) bottom is provided with base plate (6), grouting material (8) has been built in base plate (6) bottom, seal water pipe (7) and be stuck in base plate (6) bottom, cylinder (5) inwall is welded with garter spring (15), self-locking head anchor pole (10) is anchored in the anchor hole of prestress wire (3) lower end;
Being provided with gas cell (17) in described cylinder (5), gas cell (17) periphery is enclosed with netting (16), and netting (16) is connected fixing with garter spring (15);
Cylinder (5) is connected with the hydraulic rockshaft (25) being arranged on girder steel (27), and girder steel (27) is connected with fife (28), and fife (28) is connected with floating drum (26);
Described cylinder (5) top is provided with base roof plate (4), prestressed bolt (2) lower end is connected on base roof plate (4), and base roof plate (4) center offers the circular hole that gas cell (17) takes out.
2. self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation according to claim 1, it is characterized in that, described self-locking head anchor pole (10) includes self-locking head round platform nut (18), self-locking head overcoat (19), short tube with holes (20), ring for fixing (21), water shutoff plate (22), tool-type push pipe (23) and PVC madjack pipe (24);Self-locking head round platform nut (18), self-locking head overcoat (19) and short tube with holes (20) are bolted;Self-locking head round platform nut (18) is fixed on the bottom of prestress wire (3) by ground tackle, water shutoff plate (22) is connected by thread segment and the short tube with holes (20) of bottom, and the lower end of PVC madjack pipe (24) penetrates in the hole that water shutoff plate (22) is reserved fixing;Tool-type push pipe (23) is positioned at short tube with holes (20) top, and tool-type push pipe (23) is concentric with short tube with holes (20) by ring for fixing (21).
3. self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation according to claim 1, it is characterized in that, described girder steel (27) is 4, constitute rectangle, every girder steel (27) is provided with 2~4 hydraulic rockshafts (25), every girder steel (27) connects a fife (28), and every fife (28) connects a floating drum (26).
4. the construction method of a self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation, it is characterised in that comprise the following steps:
A, on dock support mould, assembling reinforcement, then bury in mould and bury cylinder (5) following peripheral from top to bottom successively underground and seal the built-in fitting of water pipe (7), the built-in fitting of leveling support, the built-in fitting of netting garter spring (15), the lower anchor slab of prestressed bolt (2) and sleeve pipe, then successively disturbing concrete, maintenance, form removal;
B, leveling support and becket bridle are installed on cylinder (5) surface, and do paint protection, then the sealing water pipe (7) of cylinder (5) following peripheral is installed, seal water pipe (7) lower section and glue one layer of foam plastics that can improve sealing, then at cylinder (5) internally installed gas cell (17), inflation, connects netting (16), installs 4 groups of jack, push pipe and hydraulic pipe;
C, the outside floating drum (26) of installation, at the bottom of the cylinder of hydraulic rockshaft (25) connector drum (5) on girder steel (27);Opening a sluice gate and drawing out some water, cylinder (5) floats, and floating drum (5) draft 2~3m by ultrasonic listening seabed flatness, processes the surface, seabed of floating drum (5) bottom, washes away surface porosity out-of-flatness part with giant;
D, being loosened downwards by the cylinder (5) hung on floating drum (26) by hydraulic rockshaft (25), sink to seabed, do not contact seabed hovering, gas cell (17) is not exitted;
E, driving 4 push pipes by cylinder (5) jack-up 300~400mm with jack, 60 anchor holes reserved from cylinder (5) insert giants, and annular bottom surface place ground is washed away, and remove the rubble that loosens;
F, retraction jack, and leveling basis, until cylinder (5) contacts with seabed and smooth, water under high pressure is filled to sealing in water pipe (7), the periphery gap of closed bottom (6), from cylinder (5), reserved anchor hole irrigates pea gravel concreten to the bottom of cylinder (5), the concrete until the upper reserved spout hole of base plate (6) is gushed out, 70% design strength is arrived after maintenance, remove cylinder (5) inner inflatable capsule (17), from base roof plate (4) centre bore, take out gas cell (17);Release the connection of outside floating drum (26) and cylinder (5), measure the change of cylinder (5) end face absolute altitude;
G, from end face anchor hole down rock drilling, reach micro-decomposed rock, by prestress wire (3) and tool-type push pipe (23) with PVC madjack pipe (24) is integrally mounted puts in anchor hole, stretch-draw prestressing force steel strand wires (3) are to design load 50%, making to be about on self-locking head round platform nut (18) self-locking head overcoat (19) backs down, press-in rock anchor hole, then in PVC madjack pipe (24), it is pressed into grouting material, self-locking head round platform nut (18) and self-locking head overcoat (19) are protected, cylinder (5) top circumference carries out this operation symmetrically;After grouting material reaches intensity, throw formula push pipe (23), it is drawn off;Complete stretch-draw prestressing force steel strand wires (3) are to design load again, and carry out ultra stretching, and finally crimping is fixing;Basis end face absolute altitude change is measured after all anchor hole stretch-draw;
H, use C60 grouting material close prestress wire (3) top; and connect fixed platform guardrail (14); doing cylinder (5) protection at periphery geotechnique's cloth bag filling silt, the internal water-filling of cylinder (5) maintains an equal level with sea level height;
I. with the upper anchor slab of the levelling prestressed bolt of C80 grouting material (2), make level height difference within 2~3mm;Then lifting coxopodite tower stretch-draw prestressing force crab-bolt (2), then lift all the other superstructures, complete the installation of blower fan unit.
CN201610292510.XA 2016-05-05 2016-05-05 Self-locking head prestress wire round platform concrete cylinder offshore wind turbine foundation and its construction method CN105756081B (en)

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Publication number Priority date Publication date Assignee Title
CN106320360A (en) * 2016-08-31 2017-01-11 江苏金海新能源科技有限公司 Prestressed self-locking anchor bolt reinforced variable-diameter single-pile fan foundation under offshore rock foundation condition and construction method thereof
CN109137958A (en) * 2018-10-24 2019-01-04 北京天杉高科风电科技有限责任公司 Prestressing force sea single-pile foundation and its installation method

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CN103807116A (en) * 2014-01-31 2014-05-21 中交一航局第二工程有限公司 Inhaul cable jack lifting type offshore wind power generation set installing device and construction method
CN104047287A (en) * 2014-05-26 2014-09-17 江苏金海新能源科技有限公司 Prestressed sleeve self-lock anchor rod
CN104790424A (en) * 2015-04-17 2015-07-22 同济大学建筑设计研究院(集团)有限公司 Reinforcing system and reinforcing method of wind power generation tower foundation ring foundation

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WO2003080939A1 (en) * 2002-03-20 2003-10-02 Boreas Consultants Limited Foundation structure
CN101230579A (en) * 2008-02-21 2008-07-30 同济大学 Annular bearing bottom plate grillage beam type wind-power generating tower foundation
WO2010093259A2 (en) * 2009-02-13 2010-08-19 Vest Kran Wind Power As Offshore wind turbine
CN102286987A (en) * 2011-07-05 2011-12-21 天津大学 Gravity-type foundation structure for maritime equipment engineering and construction method thereof
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CN106320360A (en) * 2016-08-31 2017-01-11 江苏金海新能源科技有限公司 Prestressed self-locking anchor bolt reinforced variable-diameter single-pile fan foundation under offshore rock foundation condition and construction method thereof
CN109137958A (en) * 2018-10-24 2019-01-04 北京天杉高科风电科技有限责任公司 Prestressing force sea single-pile foundation and its installation method

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