CN110453710B - Combined multi-cylinder jacket foundation structure and construction method thereof - Google Patents
Combined multi-cylinder jacket foundation structure and construction method thereof Download PDFInfo
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- CN110453710B CN110453710B CN201910573468.2A CN201910573468A CN110453710B CN 110453710 B CN110453710 B CN 110453710B CN 201910573468 A CN201910573468 A CN 201910573468A CN 110453710 B CN110453710 B CN 110453710B
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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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- 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
- E02D27/52—Submerged foundations, i.e. submerged in open water
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/22—Foundations specially adapted for wind motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
- F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
- F03D13/25—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors specially adapted for offshore installation
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/30—Wind power
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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
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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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- 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
- Y02E10/728—Onshore wind turbines
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Abstract
The invention belongs to the technical field of foundation structures of ocean engineering and discloses a combined multi-cylinder jacket foundation structure and a construction method thereof.A steel top plate is connected with the upper parts of a plurality of steel cylinders, a steel groove is connected between every two adjacent steel cylinders at the lower part of the steel top plate, a concrete plate is arranged on the steel top plate, and an outer ring beam, a middle ring beam, an inner ring beam, a concrete main beam and a concrete secondary beam are arranged on the top surface of the concrete plate; the upper parts of the middle ring beam and the inner ring beam are connected with a jacket structure for mounting upper wind power equipment, and the jacket structure comprises a stand column, a support rod and an inclined rod; the construction method comprises the steps of land prefabrication, bank debugging, water towing, negative pressure sinking, negative pressure reinforcing and the like. The invention has the advantages of a cylindrical foundation and a jacket foundation, has wide application range, convenient transportation and installation, recyclability and high bearing capacity, can transmit the load of the upper fan to a concrete top plate through a jacket structure, converts the load of the upper fan into the tensile and compressive stress with controllable structure, and further transmits the tensile and compressive stress to a plurality of steel cylinders at the lower part.
Description
Technical Field
The invention relates to the technical field of foundation structures of ocean engineering, in particular to a multi-cylinder combined foundation structure and a construction method thereof.
Background
At present, in the field of offshore wind power generation, the form of a wind turbine foundation mainly comprises a gravity type foundation, a jacket foundation, a cylindrical foundation, a pile foundation, a floating foundation and the like.
The gravity type foundation integrally resists external load by means of the dead weight of the structure and the weight of the filler and the ballast on the gravity type foundation, the structural stability is maintained, the construction principle is simple, the cost of the filler and the ballast material is low, and the construction cost is low for a shallow foundation; however, the self weight and the geometric dimension of the foundation are large, the foundation occupies a wider range of the seabed, and the requirement on geological conditions is high, so that the applicable water depth range of the gravity foundation is limited, and the cost is high.
The jacket foundation has good integrity, light weight, high structural strength, strong bearing capacity, small wave flow effect and simple and convenient construction; however, the field operation time is long, and the manufacturing cost exponentially increases along with the increase of the water depth, so the applicable water depth range of the jacket foundation is limited.
The suction type cylindrical foundation has the advantages of simple form, strong bearing capacity, simple transportation and installation, easy recovery and higher anti-slip stability of the cylindrical skirt. However, as the water depth increases, the wind wave load becomes larger, the diameter of the cylindrical foundation required by the large bending moment load is larger, and large-scale equipment is required in the processes of transportation, installation and the like.
Disclosure of Invention
The invention aims to solve the technical problems, and provides a combined multi-cylinder jacket foundation structure and a construction method thereof by combining the characteristics of large water depth adaptation of a jacket structure, convenient installation of a cylinder foundation, low manufacturing cost and recyclability.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a combined multi-cylinder jacket foundation structure comprises a plurality of identical steel cylinders, wherein the plurality of steel cylinders can form a regular polygon on a horizontal plane according to a central point connecting line, the tops of the plurality of steel cylinders are connected with a steel top plate together, a steel groove is connected between every two adjacent steel cylinders at the lower part of the steel top plate, the steel groove is downward opened and connects the plurality of steel cylinders with each other, and a concrete plate is arranged at the upper part of the steel top plate; circular through holes are formed in the centers of the steel top plate and the concrete plate, and the circular through holes do not intersect with projections of the steel cylinder on the steel top plate and the concrete plate;
the top surface of the concrete plate is provided with an outer ring beam, a middle ring beam and an inner ring beam; the outer ring beam is positioned at the outer side edge of the top surface of the concrete plate; the inner ring beam is arranged at the edge of the circular through hole on the top surface of the concrete plate; the middle ring beam is positioned between the outer ring beam and the inner ring beam; the top surface of the concrete plate is uniformly provided with concrete main beams in the radial direction, and the concrete main beams extend from the inner ring beam to the outer ring beam; concrete secondary beams are uniformly arranged on the top surface of the concrete plate in the radial direction between every two adjacent concrete main beams, and the concrete secondary beams extend from the middle ring beam to the outer ring beam;
the upper parts of the middle ring beam and the inner ring beam are connected with a jacket structure for mounting upper wind power equipment, the jacket structure comprises a plurality of identical upright columns, and the bottoms of the upright columns are uniformly distributed on the middle ring beam and are connected with the middle ring beam through flanges; a support rod is connected between every two adjacent upright columns to form a truss type steel structure; and an inclined rod is connected between the lower part of the upright post and the inner ring beam.
Further, the number of the steel cylinders is 3-8; the radius of the steel cylinder is 10-15m, and the height of the steel cylinder is 8-12 m; the net distance between two adjacent steel cylinders is 1-3 times of the outer diameter of the steel cylinder.
Furthermore, an upward steel rib plate is arranged on the periphery of the steel top plate, and the steel rib plate is inserted into the concrete plate and the outer ring beam.
Further, the concrete plate is consistent with the contour of the steel top plate, and the thickness of the concrete plate is 0.3-1 m; the radiuses of the center of the steel top plate and the circular through hole of the concrete slab are 0.5-1.0 time of the radius of the steel cylinder.
Furthermore, the steel groove is welded with the steel top plate and the side wall of the steel cylinder, and the height of the steel groove is 0.2-0.3 time of that of the steel cylinder.
Further, the outer edge of the outer ring beam is flush with the outer edge of the concrete slab, and the shape of the outer ring beam is consistent with the edge of the concrete slab; the width of the outer ring beam is 0.5-1.5m, and the height of the outer ring beam is 0.8-1.8 m; the middle ring beam is positioned in the middle of the top surface of the concrete plate, is annular, and has a width of 0.5-1.5m and a height of 0.8-1.8 m; the outer radius of the middle ring beam is 1.5-2 times of the radius of the steel cylinder; the inner diameter of the inner ring beam is consistent with the diameter of the circular through hole, the width of the inner ring beam is 0.5-1.5m, and the height of the inner ring beam is 0.8-1.8 m.
Further, the width of the concrete girder is 0.5-1.5m, and the height of the concrete girder is 0.8-1.8 m; the included angle between the adjacent concrete main beams is 60 degrees; the concrete secondary beams comprise 12-18, 2-3 concrete secondary beams are arranged between every two adjacent concrete main beams, and the included angle between the axes of the adjacent concrete secondary beams is 20-30 degrees.
Further, all the stand all inclines to the foundation structure center with the same angle from bottom to top.
A construction method of the combined multi-tube jacket foundation structure comprises the following steps:
(1) prefabricating a plurality of steel cylinders on land, forming a regular polygon on the plurality of steel cylinders on a horizontal plane according to a central point connecting line, and welding the regular polygon with the steel grooves and the steel top plate;
(2) taking the steel top plate as a bottom surface template of the concrete slab, binding steel bars on the steel top plate, and performing pouring construction on the concrete slab, the outer ring beam, the middle ring beam, the inner ring beam, the concrete main beam and the concrete secondary beam together;
(3) the upper parts of the middle ring beam and the inner ring beam are connected with the jacket structure;
(4) hoisting the combined multi-tube jacket foundation structure after the pouring construction into water, and checking the air tightness; adjusting the draught of the steel cylinder according to towing requirements;
(5) carrying out floating towing on the combined multi-tube jacket foundation structure and the machine head;
(6) after the combined multi-tube jacket foundation structure is subjected to floating towing to a designated sea area, self-weight sinking is firstly carried out, and then negative pressure sinking is carried out to a designated position;
(7) and after the sinking is finished, carrying out negative pressure reinforcement on the soil body in the steel cylinder.
The invention has the beneficial effects that:
the invention combines the advantages of the jacket and the cylindrical foundation, and the upper jacket structure can be designed according to the conditions of on-site stormy waves and currents. The jacket structure has the advantages of good foundation integrity, light weight, high structural strength, strong bearing capacity, small wave action and simple and convenient construction. The suction type cylindrical foundation has the advantages of simple form, strong bearing capacity, simple transportation and installation, easy recovery and higher anti-slip stability of the cylindrical skirt. The invention has the characteristics of light weight of jacket foundation, simple cylindrical form, convenient transportation and low manufacturing cost, and can be suitable for sea areas with deep water depth and severe sea conditions. The steel cylinders are connected by the steel top plate and the concrete plate to cooperatively bear force, and the steel cylinders are connected by the steel top plate, so that when the foundation is inclined, the leveling is realized by adjusting the negative pressure in different steel cylinders, and the deformation of the bottom of the jacket structure can be avoided by adjusting the inclination angle.
Drawings
FIG. 1 is a perspective view of a modular multi-barreled jacket infrastructure provided by the present invention;
FIG. 2 is a front view of a modular multi-barreled jacket infrastructure provided by the present invention;
FIG. 3 is a top view of a modular multi-barreled jacket infrastructure provided by the present invention;
FIG. 4 is a schematic structural view of a reinforced concrete beam slab system in a combined multi-tube jacket foundation structure provided by the present invention;
fig. 5 is a schematic structural view of a jacket structure in a modular multi-jacket foundation structure provided by the present invention.
In the figure: 1. a steel cylinder; 2. a steel top plate; 3. a concrete slab; 4. an outer ring beam; 5. a middle ring beam; 6. an inner ring beam; 7. a concrete main beam; 8. a concrete secondary beam; 9. a steel groove; 10. a column; 11. a support bar; 12. a diagonal rod.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
as shown in fig. 1 to 3, the present embodiment discloses a combined multi-tube jacket foundation structure, which includes a plurality of identical steel tubes 1, a steel roof 2, a concrete slab 3, an outer ring beam 4, a middle ring beam 5, an inner ring beam 6, a main concrete beam 7, a secondary concrete beam 8, a steel groove 9, a vertical column 10, a support rod 11, and an inclined rod 12.
A plurality of identical steel cylinders 1 can form a regular polygon on a horizontal plane according to a central point connecting line and are welded with the steel top plate 2 at the upper part. The number of the steel cylinders 1 is generally 3-8; the steel cylinder 1 is a steel cylindrical structure, the radius is 10-15m, and the height is 8-12 m. The clear distance between two adjacent steel cylinders 1 is 1-3 times of the outer diameter of the steel cylinder 1.
The steel top plate 2 is arranged at the tops of the steel cylinders 1 and welded with the top surfaces of the steel cylinders 1. The shape of the steel top plate 2 is defined by an outer common tangent of the circular section of the adjacent steel cylinder 1 and an arc line section between the outer common tangents, and the projection of the circle center of each arc line section and the circle center of the circular section of the steel cylinder 1 are the same point on the horizontal plane. The thickness of the steel top plate 2 is 0.006-0.01 m. An upward steel rib plate is arranged at the periphery of the steel top plate 2, and the height of the steel rib plate is the same as the total height of the concrete plate 3 and the outer ring beam 4; the steel rib plates are used for being inserted into the concrete plates 3 and the outer ring beams 4, and the concrete structure is integrally and effectively connected with the steel cylinder foundations 1. A circular through hole is formed in the center of the steel top plate 2 and used for reducing sinking resistance of the steel cylinders 1 in water; the range of the circular through hole does not extend to the position of the steel cylinder 1, namely the circular through hole does not intersect with the projection of the steel cylinder 1 on the steel top plate 2, and the radius of the circular through hole in the center of the steel top plate 2 is generally 0.5-1.0 time of the radius of the steel cylinder 1.
Every two adjacent steel cylinders 1 are connected with each other through steel grooves 9, and the tops of the steel grooves 9 are welded with the steel top plate 2. The steel groove 9 is a lower opening groove structure formed by welding steel plates, the width (namely the direction vertical to the central connecting line of the two steel cylinders 1) of the steel groove 9 is 0.4-0.8 time of the diameter of the steel cylinder 1, and the height of the steel groove 9 is 0.2-0.3 time of the height of the steel cylinder 1; the above dimensions can be adjusted according to actual conditions. After the foundation structure is installed in place, the steel groove 9 and the steel cylinder 1 are inserted into the soil together to bear the upper load together.
The concrete plate 3 is arranged on the upper portion of the steel top plate 2, the concrete plate 3 is consistent with the outline of the steel top plate 2, and the thickness of the concrete plate is 0.3-1 m. The concrete slab 3 is poured on the upper part of the steel roof slab 2, and the steel rib plate of the steel roof slab 2 extends upwards into the concrete slab 3, so that the concrete slab 3 and the steel roof slab 2 are firmly combined. The center of the concrete slab 3 is also provided with a circular through hole, the radius of the circular through hole is consistent with the size of the circular through hole arranged on the steel top plate 2, and the circular through hole is also used for reducing the sinking resistance of the steel cylinders 1 in water.
As shown in fig. 4, the top surface of the concrete slab 3 is provided with three ring beams, including an outer ring beam 4, a middle ring beam 5 and an inner ring beam 6. The outer ring beam 4 is positioned on the outer side of the top surface of the concrete slab 3, the outer edge of the outer ring beam is flush with the outer edge of the concrete slab 3, and the shape of the outer ring beam is consistent with that of the edge of the concrete slab 3; the width of the outer ring beam 4 is 0.5-1.5m, and the height is 0.8-1.8 m. The middle ring beam 5 is positioned in the middle of the top surface of the concrete slab 3, is in a ring shape, has the width of 0.5-1.5m and the height of 0.8-1.8 m; the external radius of the middle ring beam 5 is 1.5-2 times of the radius of the steel cylinder 1. The inner ring beam 7 is arranged at the edge of the circular through hole on the top surface of the concrete slab 3, the inner diameter of the inner ring beam 7 is consistent with the diameter of the circular through hole, the width is 0.5-1.5m, and the height is 0.8-1.8 m.
The top surface of the concrete slab 3 is connected with a main concrete beam 7 and a secondary concrete beam 8 between the three ring beams. The concrete main beams 7 are uniformly arranged on the top surface of the concrete slab 3 in the radial direction and extend from the inner ring beam 7 to the outer ring beam 4. In one embodiment of the present invention, the concrete girders 7 include 6, and an included angle between adjacent concrete girders 7 is 60 degrees; the width of the concrete girder 7 is 0.5-1.5m, and the height is 0.8-1.8 m. The concrete secondary beams 8 are uniformly arranged between every two adjacent concrete main beams 7 on the top surface of the concrete slab 3 in the radial direction and extend from the middle ring beam 5 to the outer ring beam 4. In one embodiment of the invention, the number of the concrete secondary beams 8 is 12-18, 2-3 concrete secondary beams 8 are arranged between every two adjacent concrete main beams 7, and the included angle between the axes of the adjacent concrete secondary beams 8 is 20-30 degrees.
The upper parts of the middle ring beam 5 and the inner ring beam 6 are connected with a jacket structure, and the jacket structure is used for connecting upper wind power equipment. In one embodiment of the invention, as shown in fig. 5, the jacket structure is composed of four identical upright posts 10, a plurality of support rods 11 and eight diagonal rods 12, and the overall height of the jacket structure is 50 m. The outer diameter of the steel pipe of the upright post 10 is 0.5m, and the thickness is 5 mm. The bottoms of the four upright posts 10 are arranged on a middle ring beamThe upper ring of the foundation structure 5 is uniformly distributed in the circumferential direction, namely the bottom ends of four upright columns 10 are connected to form a square, the bottom of each upright column 10 is connected with the middle ring beam 5 through a flange, the four upright columns 10 are inclined from bottom to top to the center of the foundation structure at the same angle, and the apparent inclination angle is 80-85 degrees. And a plurality of support rods 11 are connected between every two adjacent upright columns 10 to form a truss type steel structure. The outer diameter of the steel pipe of the support rod 11 is 0.3m, and the thickness is 3 mm. A group of (two) inclined rods 12 are further arranged between every two adjacent upright posts 10, each group of inclined rods 12 is arranged in an inverted triangle mode, the upper ends of the two inclined rods 12 of each group are respectively connected to the two upright posts 10, the lower ends of the two inclined rods 12 are intersected together and connected with the inner ring beam 6, the four connecting points are circumferentially and uniformly distributed on the inner ring beam 6, and the connecting lines of the four connecting points form a square. So that the radius of the middle ring beam 5 is equal to that of the inner ring beam 6
And (4) doubling. The jacket structure helps to transfer the upper load into the concrete beam slab system and thus spread it over the plurality of steel cylinders 1. In addition, the jacket structure has good integrity, is less influenced by wind and waves, has high structural strength and is beneficial to bearing external loads.
The construction method of the combined multi-tube jacket foundation structure specifically comprises the following steps:
(1) prefabricating a plurality of steel cylinders 1 on land, forming a regular polygon by connecting the plurality of steel cylinders 1 on a horizontal plane according to central points of the steel cylinders, and connecting the steel cylinders 1 with steel grooves 9 and steel top plates 2 by welding;
(2) taking the steel top plate 2 as a bottom surface template of the concrete plate 3, binding steel bars on the steel top plate 2, and carrying out pouring construction on the concrete plate 3, the outer ring beam 4, the middle ring beam 5, the inner ring beam 6, the concrete main beam 7 and the concrete secondary beam 8 together;
(3) the upper parts of the middle ring beam 5 and the inner ring beam 6 are connected with a jacket structure which comprises a vertical column 10, a support rod 11 and an inclined rod 12;
(3) hoisting the combined multi-tube jacket foundation structure after the pouring construction into water, and checking the air tightness; the draught of the steel cylinder 1 is adjusted according to towing requirements;
(4) carrying out floating towing on the combined multi-tube jacket foundation structure;
(5) after the combined multi-tube jacket foundation structure is floated and towed to a designated sea area, the self-weight sinking is carried out by utilizing the self-weight of the foundation structure, and then the foundation structure is subjected to negative pressure sinking through negative pressure and sinks to a designated position; the foundation structure can be leveled through a pump system in the sinking process;
(6) and after the sinking is finished, continuously pumping negative pressure for a period of time to reinforce the soil body in the steel cylinder 1.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.
Claims (9)
1. A combined multi-cylinder jacket foundation structure comprises a plurality of identical steel cylinders, wherein the plurality of steel cylinders can form a regular polygon on a horizontal plane according to a central point connecting line, and the regular polygon is arranged; a concrete slab is arranged on the upper part of the steel top plate; circular through holes are formed in the centers of the steel top plate and the concrete plate, and the circular through holes do not intersect with projections of the steel cylinder on the steel top plate and the concrete plate;
the top surface of the concrete plate is provided with an outer ring beam, a middle ring beam and an inner ring beam; the outer ring beam is positioned at the outer side edge of the top surface of the concrete plate; the inner ring beam is arranged at the edge of the circular through hole on the top surface of the concrete plate; the middle ring beam is positioned between the outer ring beam and the inner ring beam; the top surface of the concrete plate is uniformly provided with concrete main beams in the radial direction, and the concrete main beams extend from the inner ring beam to the outer ring beam; concrete secondary beams are uniformly arranged on the top surface of the concrete plate in the radial direction between every two adjacent concrete main beams, and the concrete secondary beams extend from the middle ring beam to the outer ring beam;
the upper parts of the middle ring beam and the inner ring beam are connected with a jacket structure for mounting upper wind power equipment, the jacket structure comprises a plurality of identical upright columns, and the bottoms of the upright columns are uniformly distributed on the middle ring beam and are connected with the middle ring beam through flanges; a support rod is connected between every two adjacent upright columns to form a truss type steel structure; and an inclined rod is connected between the lower part of the upright post and the inner ring beam.
2. A modular multi-barrel jacket infrastructure according to claim 1, wherein the number of steel barrels is 3-8; the radius of the steel cylinder is 10-15m, and the height of the steel cylinder is 8-12 m; the net distance between two adjacent steel cylinders is 1-3 times of the outer diameter of the steel cylinder.
3. A modular multi-jacket foundation structure as claimed in claim 1, wherein said steel top plate is provided with upward steel ribs at its periphery, said steel ribs being inserted into said concrete slab and said outer ring beams.
4. A modular multi-barrelled jacket foundation structure according to claim 1, wherein said concrete slab conforms to the contour of said steel top plate, said concrete slab having a thickness of 0.3-1 m; the radiuses of the center of the steel top plate and the circular through hole of the concrete slab are 0.5-1.0 time of the radius of the steel cylinder.
5. A modular multi-barrel jacket foundation structure as claimed in claim 1, wherein said steel grooves have a height of 0.2-0.3 times the height of said steel barrels.
6. A modular multi-jacket foundation structure as claimed in claim 1, wherein the outer edge of said outer ring beam is flush with the outer edge of said concrete slab and is shaped to conform to the edge of said concrete slab; the width of the outer ring beam is 0.5-1.5m, and the height of the outer ring beam is 0.8-1.8 m; the middle ring beam is positioned in the middle of the top surface of the concrete plate, is annular, and has a width of 0.5-1.5m and a height of 0.8-1.8 m; the outer radius of the middle ring beam is 1.5-2 times of the radius of the steel cylinder; the inner diameter of the inner ring beam is consistent with the diameter of the circular through hole, the width of the inner ring beam is 0.5-1.5m, and the height of the inner ring beam is 0.8-1.8 m.
7. A modular multi-tube jacket foundation structure according to claim 1, wherein said concrete girders have a width of 0.5-1.5m and a height of 0.8-1.8 m; the included angle between the adjacent concrete main beams is 60 degrees; the concrete secondary beams comprise 12-18, 2-3 concrete secondary beams are arranged between every two adjacent concrete main beams, and the included angle between the axes of the adjacent concrete secondary beams is 20-30 degrees.
8. A modular multi-jacket foundation structure as claimed in claim 1, wherein said plurality of columns are all inclined from bottom to top at the same angle towards the center of the foundation structure.
9. A method of constructing a modular multi-jacket foundation structure according to any one of claims 1 to 8, comprising the steps of:
(1) prefabricating a plurality of steel cylinders on land, forming a regular polygon on the plurality of steel cylinders on a horizontal plane according to a central point connecting line, and welding the regular polygon with the steel grooves and the steel top plate;
(2) taking the steel top plate as a bottom surface template of the concrete slab, binding steel bars on the steel top plate, and performing pouring construction on the concrete slab, the outer ring beam, the middle ring beam, the inner ring beam, the concrete main beam and the concrete secondary beam together;
(3) the upper parts of the middle ring beam and the inner ring beam are connected with the jacket structure;
(4) hoisting the combined multi-tube jacket foundation structure after the pouring construction into water, and checking the air tightness; adjusting the draught of the steel cylinder according to towing requirements;
(5) carrying out floating towing on the combined multi-tube jacket foundation structure and the machine head;
(6) after the combined multi-tube jacket foundation structure is subjected to floating towing to a designated sea area, self-weight sinking is firstly carried out, and then negative pressure sinking is carried out to a designated position;
(7) and after the sinking is finished, carrying out negative pressure reinforcement on the soil body in the steel cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910573468.2A CN110453710B (en) | 2019-06-28 | 2019-06-28 | Combined multi-cylinder jacket foundation structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910573468.2A CN110453710B (en) | 2019-06-28 | 2019-06-28 | Combined multi-cylinder jacket foundation structure and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110453710A CN110453710A (en) | 2019-11-15 |
| CN110453710B true CN110453710B (en) | 2021-08-13 |
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