CN114086592A - Fabricated offshore wind power floating foundation structure and construction method thereof - Google Patents
Fabricated offshore wind power floating foundation structure and construction method thereof Download PDFInfo
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- CN114086592A CN114086592A CN202111396432.5A CN202111396432A CN114086592A CN 114086592 A CN114086592 A CN 114086592A CN 202111396432 A CN202111396432 A CN 202111396432A CN 114086592 A CN114086592 A CN 114086592A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
- E02D27/425—Foundations for poles, masts or chimneys specially adapted for wind motors masts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/4433—Floating structures carrying electric power plants
- B63B2035/446—Floating structures carrying electric power plants for converting wind energy into electric energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
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Abstract
The invention provides an assembled offshore wind power floating foundation structure and a construction method thereof. The invention reduces the requirements of processing field and transportation equipment; the special box-type connecting beam assembly structure can be directly assembled on the sea, and is favorable for mass flow production of the fan foundation.
Description
Technical Field
The invention relates to the technical field of offshore wind power development equipment, in particular to an assembled offshore wind power floating foundation structure and a construction method thereof.
Background
China is in a key stage of energy transformation, wind energy is used as renewable clean energy, the technology is mature day by day, the cost is reduced continuously, and the wind energy plays a significant role in new energy development in China. Offshore wind power generation has unique advantages over onshore wind power generation. The offshore wind resources are rich, and the wind speed and the wind direction are stable; the offshore wind power plant does not occupy land resources; the single machine has large capacity and is suitable for large-scale development. At present, the development of offshore fixed wind power is mainly industrialized, and some offshore wind power plants built in early stage are in the middle and later development stage. However, the development of floating wind power oriented to water depth over 50 m is still in experimental research stage both domestically and internationally. In the long run, with the gradual saturation of wind power resource development in intertidal zones and offshore regions, the trend of offshore wind power development from offshore to deep and distant sea is a necessary trend, and the research and development and design of the floating offshore wind turbine generator structure are imperative.
The floating offshore wind turbine structure is a complex multi-system combined engineering device, is composed of a plurality of subsystems and mainly comprises an upper fan, a middle tower, a lower floating foundation and a mooring system. The floating foundation is the dependence of the whole wind turbine generator set on stable power generation, and the design of the floating foundation is the important factor in the design of the whole device. In order to meet the operation requirement of the wind generating set in the deep and open sea environment, the design size of the floating foundation is usually very large. The existing floating foundation design is generally processed in a workshop or a dock integrally and is transported to an offshore machine position, so that the requirements on a processing site and a transport ship are high, and the requirement on batch production of wind power plant construction is not facilitated.
Disclosure of Invention
In view of the defects in the prior art, the first object of the present invention is to provide a fabricated offshore wind power floating foundation structure and a construction method thereof. The invention reduces the requirements of processing field and transportation equipment; the special box-type connecting beam assembly structure can be directly assembled on the sea, and is favorable for mass flow production of the fan foundation.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the utility model provides an assembled offshore wind power foundation structure that floats which characterized in that: including a plurality of prefabricated column components of a whole that can function independently structures and box tie-beam, a plurality of column components of a whole that can function independently structures are regular triangle and arrange, link to each other through the box tie-beam between two column components of a whole that can function independently structures, the column components of a whole that can function independently structure and the junction of box tie-beam reserve to have socket and grout cabin, the both ends of box tie-beam are equipped with spacing tensile connection structure with the junction of column components of a whole that can function independently structure.
Further: the column type split structure is divided into two-section type structures, the cross section of the upper section structure is smaller than that of the lower section structure, the upper section structure and the lower section structure are connected with the box-type connecting beam respectively, the sockets are reserved at the joints of the upper section structure and the lower section structure and the box-type connecting beam, the grouting cabins are connected around the sockets, and the sizes of the sockets are matched with those of the box-type connecting beam.
Further: the surfaces of the upper section structure and the lower section structure, which are positioned on the outer side of the foundation structure, are respectively arranged in a cylindrical surface mode, and the upper section structure and the lower section structure are arranged in a plane mode on the connecting side connected with the box-type connecting beam.
Further: two adjacent planes on the column type split structure are provided with installation positioning surfaces for forming the box-type connecting beam, a detachable installation positioning tool is configured on the installation positioning surfaces, and the installation positioning tool plays a role in positioning and guiding in the installation process of the box-type connecting beam; the installation positioning tool comprises two first connecting plates which are connected and arranged at an angle of 120 degrees, the other ends of the two first connecting plates are respectively connected with a second connecting plate, and an included angle between the two second connecting plates is arranged at an angle of 60 degrees.
Further: cross openings are reserved at the joints of the two ends of the box-type connecting beam and the column-type split structures, the grouting cabins of the lower section structures comprise cabin walls on the two sides, the top and the bottom of the socket and are provided with first grouting grooves, reinforcing steel bars are distributed in the cross openings at the two ends of the box-type connecting beam, the end parts of the reinforcing steel bars are arranged in the first grouting grooves, and concrete is poured into the first grouting grooves; the grouting cabin of the upper section structure comprises a cabin wall around the socket and is provided with a second grouting groove, the end parts of reinforcing steel bars arranged in cross-shaped openings at two ends of the box-type connecting beam are arranged in the second grouting groove, and concrete is poured in the second grouting groove.
Further: the column type split structure is provided with a mooring system fixedly connected, and watertight ballast tanks can be arranged in the space outside the grouting cabin and the faucet inside the column type split structure.
Further: a grouting channel connected to the grouting cabin and the socket is reserved in the column type split structure.
Further: shear keys are reserved at the joints of the two ends of the box-type connecting beam and the column-type split structures, and the shear keys are arranged on the periphery of the outer wall of the box-type connecting beam and perpendicular to the axis of the box-type connecting beam.
A second object of the present invention is to: there is provided a construction method of an assembled offshore wind power floating foundation structure, in which the column type split structure and the box type connection beam as claimed in claim 1 are prefabricated in a dock and transported to a bay, an offshore or a service stand by a barge to be spliced and grouted, the construction method comprising the steps of:
s1, first assembling: firstly, a barge is utilized to carry and stabilize the two column type split structures, a box-type connecting beam is correspondingly inserted into a socket of the upper section structure of the two column type split structures on the barge, reinforcing steel bars are penetrated into a cross opening of the box-type connecting beam, two ends of the reinforcing steel bars are reserved in a second grouting groove, and grouting is carried out on a grouting cabin of the upper section structure through a grouting channel;
s2, inserting another box-type connecting beam into the sockets of the lower section structures of the two column-type split structures correspondingly, penetrating reinforcing steel bars into cross openings of the box-type connecting beams, reserving two ends of the reinforcing steel bars in the first grouting grooves, and grouting the grouting cabins of the lower section structures through grouting channels;
s3, second assembling: carrying and stabilizing a third column type split structure by using another barge, ensuring that the three column type split structures are arranged in a triangular shape, correspondingly inserting a box-type connecting beam into the sockets of the upper section structures of the third column type split structure and the other two column type split structures respectively, penetrating reinforcing steel bars into cross openings of the box-type connecting beams, reserving two ends of the reinforcing steel bars in a second grouting groove, and grouting the grouting cabin of the upper section structure through a grouting channel;
s4, inserting a box-type connecting beam into each of the sockets of the lower section structures of the third column-type split structure and the other two column-type split structures, penetrating a reinforcing steel bar into a cross opening of the box-type connecting beam, reserving two ends of the reinforcing steel bar in a first grouting groove, and grouting the grouting cabin of the lower section structure through a grouting channel;
s5, overall launching, wet towing and machine position installation of the structure: after the grouting strength of the foundation structure reaches the specified strength, the whole foundation structure is launched into water and transported to a fan position in a floating mode, and a mooring system is installed; wherein the anchoring work of the mooring system has been completed before the structure is hauled to the fan location.
Further: before the third column type split structure is assembled, an installation positioning tool is arranged at the position of a socket of the third column type split structure and the other column type split structure needing to be assembled with the box-type connecting beam, the position of the box-type connecting beam is selected according to the positioning and guiding functions of the installation positioning tool, and the box-type connecting beam is supported and positioned in the inserting process of the box-type connecting beam.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the assembly type design greatly reduces the requirements on steel structure processing factories, transportation and installation ships and wharfs, reduces the construction difficulty and threshold, and provides a reliable idea for the mass production of wind power plant construction.
2. The invention is based on the design concept of offshore assembly, the structural basic form is semi-submerged, the application range of the water depth is wide, and the invention can be simultaneously suitable for shallow water and deep sea areas.
3. The vertical column type split structures are assembled on the sea through the box-type connecting beams, and the special assembling structure of the box-type connecting beams and the split vertical columns and the construction technical means are favorable for offshore assembling operation.
4. The design of the cross-shaped leaning opening and the internal arrangement of the ribs of the box-type connecting beam in the column-type split structure is beneficial to ensuring the uniform transmission of structural force after grouting connection and ensuring the strength of the connecting part.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is a schematic structural view of the column split structure of the present invention;
FIG. 5 is a schematic structural view of the box-type connecting beam of the present invention;
FIG. 6 is a partially enlarged view of the junction between the column split structure and the box-type connecting beam according to the present invention;
FIG. 7 is a first rig of the offshore rig operation of the present invention;
FIG. 8 is a second assembly of the offshore assembly operation of the present invention;
fig. 9 is a schematic structural diagram of the installation positioning tool of the invention.
Reference numerals are as follows: 1-column type split structure; 2-box type connecting beams; 3, installing a positioning tool; 4-a socket; 5-grouting cabin; 6-shear key; 7-a cross opening; 8-upper segment structure; 9-lower section structure; 10-rectangular cross section; 11-a first grouting groove; 12-reinforcing steel bars; 13-a second grouting tank; 14-a first connection plate; 15-second connecting plate.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with the specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
As shown in fig. 1 to 9, an assembled offshore wind power floating foundation structure and a construction method thereof include a plurality of prefabricated column type split structures 1 and box type connecting beams 2. The total height of the column type split structure 1 is 30 meters, the diameter of the upper section structure 8 is 13 meters, and the diameter of the lower section structure 9 is 25 meters. The length of the box-type connecting beam 2 is 35 meters, and the cross section of the box-type connecting beam is 9 multiplied by 6 meters. A plurality of column components of a whole that can function independently structures 1 are regular triangle and arrange, link to each other through box tie-beam 2 between two column components of a whole that can function independently structures 1, reserve on column components of a whole that can function independently structure 1 and have socket 4 and grout cabin 5 with the junction of box tie-beam 2, the both ends of box tie-beam 2 are equipped with spacing tensile connection structure with the junction of column components of a whole that can function independently structure 1.
The column type split structure 1 is divided into two-section type structures, the cross section of an upper section structure 8 is smaller than that of a lower section structure 9, the upper section structure 8 and the lower section structure 9 are connected with the box-type connecting beam 2 respectively, the sockets 4 are reserved at the joints of the upper section structure 8, the lower section structure 9 and the box-type connecting beam 2, the grouting cabins 5 are connected around the sockets 4, and the size of the sockets 4 is matched with that of the box-type connecting beam 2.
The upper portion section structure 8 and the lower portion section structure 9 are located the surface in the foundation structure outside and equally divide and do not be the face of cylinder setting to guarantee that column components of a whole that can function independently structure 1 all the way wave load is even, and upper portion section structure 8 and lower portion section structure 9 are the rectangle cross-section 10 that the plane set up in the side of being connected with box tie-beam 2, in order to make things convenient for box tie-beam 2 to assemble at sea, and the elevation of assembled marine wind power floating foundation structure's design waterline is unanimous with upper portion section structure 8's elevation.
Two adjacent rectangular sections 10 on the column type split structure 1 form an installation positioning surface of the box-type connecting beam 2, a detachable installation positioning tool 3 is configured on the installation positioning surface, and the installation positioning tool plays a role in guiding in the installation process of the box-type connecting beam 2. The installation positioning tool 3 comprises two first connecting plates 14 which are connected and arranged at 120 degrees, the side surfaces of the two first connecting plates 14 are respectively connected with the two adjacent rectangular cross sections 10, the other ends of the two first connecting plates 14 are respectively connected with second connecting plates 15, and an included angle between the two second connecting plates 15 is 60 degrees.
When the box-type connecting beam 2 is installed, the barge on the sea inevitably shakes, which causes certain difficulty in positioning and installing the box-type connecting beam 2; at the moment, the mounting and positioning tools 3 are mounted on the rectangular cross section 10 of the column split structure 1 of the two column split structures 1, which needs to be assembled with the box-type connecting beam 2, the side wall of the box-type connecting beam 2 is attached to the second connecting plates 15 of the two mounting and positioning tools 3, and moves to the socket 4 of the column split structure 1 along the second connecting plates 15, so that the box-type connecting beam 2 can be easily inserted into the socket 4 of the column split structure 1, and then the other column split structure 1 moves towards the direction of the box-type connecting beam 2 through the attaching surface of the second connecting plates 15 and the box-type connecting beam 2, so that the box-type connecting beam 2 is inserted into the socket 4; meanwhile, in the process of connecting and pouring concrete, the mounting and positioning tool 3 also plays a role in supporting and positioning the box-type connecting beam 2.
The limiting tensile connection structure is implemented in the following mode: the both ends of box tie-beam 2 reserve cross opening 7 with the junction of column components of a whole that can function independently structure 1, grout cabin 5 of lower part section structure 9 includes and has seted up first grout groove 11 on the bulkhead of 4 both sides of socket, top and bottom, lay reinforcing bar 12 in the cross opening 7 at 2 both ends of box tie-beam, the tip setting of reinforcing bar 12 is in first grout groove 11, pours into concrete in the first grout groove 11.
The grouting cabin 5 of the upper section structure 8 comprises a cabin wall around the socket 4 and is provided with a second grouting groove 13, the end parts of reinforcing steel bars 12 arranged in the cross-shaped openings 7 at the two ends of the box-type connecting beam 2 are arranged in the second grouting groove 13, and concrete is poured in the second grouting groove 13. The first grouting groove 11 and the second grouting groove 13 are arranged to provide firm supporting force for the box-type connecting beam 2 in all directions after grouting. The concrete is provided with stronger tensile capacity by arranging the reinforcing steel bars 12.
Temporary fixing equipment such as anchor rods, jacks or welding plates and the like can be added into the cross-shaped opening 7 in the marine assembling construction process so as to prevent relative displacement during assembling. One of the column type split structures 1 is used as a fan mounting platform, a tower cylinder connecting flange is arranged at the top of the fan mounting platform, and a fan tower cylinder and a wind driven generator are mounted above the fan tower cylinder connecting flange; the top surface of the fan mounting platform is fixedly connected with the bottom end of the fan tower cylinder, and the top end of the fan tower cylinder is fixedly connected with a wind driven generator; the wind driven generator mainly comprises a cabin, a hub and blades.
The size of the socket 4 and the grouting compartment 5 is matched with that of the box-type connecting beam 2.
The column type split structure 1 is provided with a mooring system which is fixedly connected, the foundation structure is moored on a seabed through the mooring system, watertight ballast tanks can be arranged in the space outside the grouting cabin 5 and the faucet 4 in the column type split structure 1, and can be filled with fixed ballast or movable ballast, and fillers can be high-density ore, seawater and concrete, so that the draught state and underwater posture of the structure can be adjusted.
The mooring system mainly comprises a cable guide hole, an anchor machine and an anchor chain, wherein the anchor machine is arranged in the column type split structure 1, the cable guide hole is formed in the anchor machine, and the anchor chain is connected with the anchor machine through the cable guide hole. The mooring system adopts catenary mooring or tension mooring, anchor machines are arranged in the three column type split structures 1, and the included angle between every two adjacent mooring points is 120 degrees; each anchor machine is connected with two anchor chains, and the included angle of the two anchor chains is 60 degrees.
The grouting cabin 5 is provided with a watertight cabin door, construction personnel can enter the grouting cabin 5 for temporary reinforcement and rib arrangement before grouting through the watertight cabin door, and the construction personnel quit from the cabin after rib arrangement; after grouting, the watertight hatch is not activated. A grouting passage connected to the grouting compartment 5 and the spigot 4 is reserved in the column split structure 1. The grouting equipment can use this grouting channel to grout the grouting compartment 5 and the spigot 4. During grouting, grout flows into the cross opening 7 of the box-type connecting beam 2 from the closed cabin or the socket 4 of the column type split structure 1 through the grouting channel, and fills the whole grouting space with the grouting cabin 5 and the socket 4.
The invention also provides a construction method of the fabricated offshore wind power floating foundation structure, wherein a column type split structure 1 and a box-type connecting beam 2 are prefabricated in a dock and are transported to a bay, an offshore place or a service machine position in a split mode by a barge to be spliced and connected in grouting, and the construction method comprises the following steps:
s1, first assembling: firstly, a barge is utilized to carry two column type split structures 1 stably, a box-type connecting beam 2 is correspondingly inserted into a socket 4 of an upper section structure 8 of the two column type split structures 1 on the barge, reinforcing steel bars 12 are inserted into a cross opening 7 of the box-type connecting beam 2, two ends of the reinforcing steel bars 12 are reserved in a second grouting groove 13, and grouting is carried out on a grouting cabin 5 of the upper section structure 8 through a grouting channel;
s2, inserting another box-type connecting beam 2 into the socket 4 of the lower section structure 9 of the two column-type split structures 1 correspondingly, penetrating a reinforcing steel bar 12 into a cross opening 7 of the box-type connecting beam 2, reserving two ends of the reinforcing steel bar 12 in a first grouting groove 11, and grouting the grouting cabin 5 of the lower section structure 9 through a grouting channel;
s3, second assembling: carrying the third column type split structure 1 stably by using another barge, ensuring that the three column type split structures 1 are arranged in a triangular shape, correspondingly inserting a box-type connecting beam 2 into the sockets 4 of the third column type split structure 1 and the upper section structures 8 of the other two column type split structures 1 respectively, penetrating reinforcing steel bars 12 into cross openings 7 of the box-type connecting beam 2, reserving two ends of the reinforcing steel bars 12 in a second grouting groove 13, and grouting the grouting cabin 5 of the upper section structure 8 through a grouting channel;
s4, inserting a box-type connecting beam 2 into the sockets 4 of the lower section structures 9 of the third column-type split structure 1 and the other two column-type split structures 1, penetrating reinforcing steel bars 12 into the cross-shaped openings 7 of the box-type connecting beams 2, reserving two ends of the reinforcing steel bars 12 in the first grouting grooves 11, and grouting the grouting cabins 5 of the lower section structures 9 through grouting channels;
s5, integral launching, wet dragging and machine position installation of the structure: after the grouting strength of the foundation structure reaches the specified strength, the whole foundation structure is launched into water and transported to a fan position in a floating mode, and a mooring system is installed; wherein the anchoring work of the mooring system has been completed before the structure is hauled to the fan location.
Before the third column type split structure 1 is assembled, an installation positioning tool 3 is arranged at the position of a socket 4 of the third column type split structure 1 and the other column type split structure 1 needing to be assembled with the box type connecting beam 2, the position of the box type connecting beam 2 is selected according to the positioning and guiding functions of the installation positioning tool 3, and the box type connecting beam 2 is supported and positioned in the inserting process.
After the first assembly is completed and before the second assembly, the third column type split structure 1 is used as a fan mounting platform to mount a tower, a fan and an impeller.
In step S5, in the wet towing process, partial ballast is preloaded in the foundation structure, the towing center of gravity of the structure is adjusted to facilitate towing, and after the structure reaches the installation position, ballast water is loaded again and adjusted to the design draft. The anchor and the anchor chain of the mooring system are pre-installed in a working sea area, and after the foundation structure is towed to the site, the free end of the anchor chain is connected to an anchor machine in the column type split structure 1 to complete mooring.
According to the description and the drawings, the assembled offshore wind power floating foundation structure and the construction method thereof can be easily manufactured or used by the technical personnel in the field, and the positive effects recorded in the invention can be generated.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The utility model provides an assembled offshore wind power foundation structure that floats which characterized in that: including a plurality of prefabricated column components of a whole that can function independently structures (1) and box tie-beam (2), a plurality of column components of a whole that can function independently structures (1) are regular triangle and arrange, link to each other through box tie-beam (2) between two column components of a whole that can function independently structures (1), reserve in the junction with box tie-beam (2) on column components of a whole that can function independently structure (1) and have socket (4) and grout cabin (5), the both ends of box tie-beam (2) are equipped with spacing tensile connection structure in the junction with column components of a whole that can function independently structure (1).
2. The fabricated offshore wind power floating infrastructure of claim 1, wherein: the column type split structure (1) is divided into two sections, the cross section of the upper section structure (8) is smaller than that of the lower section structure (9), the upper section structure (8) and the lower section structure (9) are equally divided and are respectively connected with the box-type connecting beam (2), the connection part of the upper section structure (8) and the lower section structure (9) and the box-type connecting beam (2) is reserved with the socket (4), the grouting cabin (5) is connected around the socket (4), and the size of the socket (4) is matched with that of the box-type connecting beam (2).
3. The fabricated offshore wind power floating infrastructure of claim 2, wherein: the surfaces, located on the outer side of the foundation structure, of the upper section structure (8) and the lower section structure (9) are respectively arranged in a cylindrical surface mode, and the upper section structure (8) and the lower section structure (9) are arranged on the plane (10) on the connecting side connected with the box-type connecting beam (2).
4. The fabricated offshore wind power floating infrastructure of claim 3, wherein: two adjacent planes (10) on the column type split structure (1) form an installation positioning surface of the box-type connecting beam (2), a detachable installation positioning tool (3) is configured on the installation positioning surface, and the installation positioning tool (3) plays a role in positioning and guiding in the installation process of the box-type connecting beam (2); the installation positioning tool (3) comprises two first connecting plates (14) which are connected and arranged at 120 degrees, the other ends of the two first connecting plates (14) are respectively connected with a second connecting plate (15), and an included angle between the two second connecting plates (15) is 60 degrees.
5. The fabricated offshore wind power floating infrastructure of claim 2, wherein: the cross-shaped opening (7) is reserved at the joint of the two ends of the box-shaped connecting beam (2) and the column-type split structure (1), the grouting cabin (5) of the lower section structure (9) comprises first grouting grooves (11) formed in the bulkheads on the two sides, the top and the bottom of the socket (4), reinforcing steel bars (12) are distributed in the cross-shaped openings (7) at the two ends of the box-shaped connecting beam (2), the end parts of the reinforcing steel bars (12) are arranged in the first grouting grooves (11), and concrete is poured into the first grouting grooves (11); the grouting cabin (5) of the upper section structure (8) comprises a second grouting groove (13) formed in the cabin wall around the socket (4), the end portions of reinforcing steel bars (12) arranged in cross openings (7) at the two ends of the box-type connecting beam (2) are arranged in the second grouting groove (13), and concrete is poured into the second grouting groove (13).
6. The fabricated offshore wind power floating infrastructure of claim 1, wherein: the column type split structure (1) is provided with a mooring system fixedly connected with the column type split structure, and watertight ballast tanks can be arranged in the space outside the grouting cabin (5) and the insertion opening (4) in the column type split structure (1).
7. The fabricated offshore wind power floating infrastructure of claim 1, wherein: a grouting channel connected to a grouting cabin (5) and a socket (4) is reserved in the column type split structure (1).
8. The fabricated offshore wind power floating infrastructure of claim 1, wherein: shear keys (6) are reserved at the joints of the two ends of the box-type connecting beam (2) and the column-type split structures (1), and the shear keys (6) are arranged on the periphery of the outer wall of the box-type connecting beam (2) and perpendicular to the axis of the box-type connecting beam (2).
9. A construction method of an assembled offshore wind power floating foundation structure, characterized in that the column type split structure (1) and the box type connecting beam (2) as claimed in claim 1 are prefabricated in a dock and transported to a bay, offshore or service bay for splicing and grouting connection by barge splitting, the construction method comprising the steps of:
s1, first assembling: firstly, a barge is utilized to carry two column type split structures (1) stably, a box-type connecting beam (2) is correspondingly inserted into a socket (4) of an upper section structure (8) of the two column type split structures (1) on the barge, reinforcing steel bars (12) penetrate into a cross opening (7) of the box-type connecting beam (2), two ends of the reinforcing steel bars (12) are reserved in a second grouting groove (13), and grouting is carried out on a grouting cabin (5) of the upper section structure (8) through a grouting channel;
s2, inserting another box-type connecting beam (2) into the inserting holes (4) of the lower section structures (9) of the two column-type split structures (1), penetrating reinforcing steel bars (12) into the cross openings (7) of the box-type connecting beams (2), reserving two ends of the reinforcing steel bars (12) in the first grouting grooves (11), and grouting the grouting cabins (5) of the lower section structures (9) through grouting channels;
s3, second assembling: carrying and stabilizing a third column type split structure (1) by using another barge, ensuring that the three column type split structures (1) are arranged in a triangular shape, correspondingly inserting a box-type connecting beam (2) into sockets (4) of upper section structures (8) of the third column type split structure (1) and the other two column type split structures (1) respectively, penetrating a reinforcing steel bar (12) into a cross opening (7) of the box-type connecting beam (2), reserving two ends of the reinforcing steel bar (12) in a second grouting groove (13), and grouting a grouting cabin (5) of the upper section structure (8) through a grouting channel;
s4, correspondingly inserting a box-type connecting beam (2) into each of the sockets (4) of the lower section structures (9) of the third column-type split structure (1) and the other two column-type split structures (1), penetrating a reinforcing steel bar (12) into a cross opening (7) of the box-type connecting beam (2), reserving two ends of the reinforcing steel bar (12) in a first grouting groove (11), and grouting the grouting cabin (5) of the lower section structure (9) through a grouting channel;
s5, overall launching, wet towing and machine position installation of the structure: after the grouting strength of the foundation structure reaches the specified strength, the whole foundation structure is launched into water and transported to a fan position in a floating mode, and a mooring system is installed; wherein the anchoring work of the mooring system has been completed before the structure is hauled to the fan location.
10. The construction method of the fabricated offshore wind power floating foundation structure of claim 9, wherein: before the third column type split structure (1) is assembled, an installation positioning tool (3) is arranged at the position of a socket (4) of the third column type split structure (1) and another column type split structure (1) needing to be assembled with the box type connecting beam (2), the position of the box type connecting beam (2) is selected according to the positioning and guiding functions of the installation positioning tool (3), and the box type connecting beam (2) is supported and positioned in the inserting process of the box type connecting beam (2).
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