CN110397068B - Multi-cylinder steel-concrete combined foundation structure and construction method thereof - Google Patents
Multi-cylinder steel-concrete combined foundation structure and construction method thereof Download PDFInfo
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- CN110397068B CN110397068B CN201910573527.6A CN201910573527A CN110397068B CN 110397068 B CN110397068 B CN 110397068B CN 201910573527 A CN201910573527 A CN 201910573527A CN 110397068 B CN110397068 B CN 110397068B
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- 239000004567 concrete Substances 0.000 title claims abstract description 177
- 238000010276 construction Methods 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 145
- 239000010959 steel Substances 0.000 claims abstract description 145
- 230000007704 transition Effects 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims description 12
- 239000011150 reinforced concrete Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 238000007667 floating Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000002689 soil Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract description 8
- 238000009417 prefabrication Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract 1
- 239000000945 filler Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
Classifications
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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
- 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
-
- 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 multi-cylinder steel-concrete combined foundation structure and a construction method thereof, wherein the multi-cylinder steel-concrete combined foundation structure comprises a plurality of steel cylinder foundations, central points of the steel cylinder foundations are connected into a regular polygon, the upper parts of the plurality of steel cylinder foundations are connected with a steel top plate, concrete plates are arranged on the steel top plate, 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 each concrete plate, the upper parts of the middle ring beams are connected with a concrete transition section, and steel tower cylinders are arranged on the upper parts of the concrete transition sections; the construction method comprises the steps of land prefabrication, shore hoisting, water towing, negative pressure sinking, negative pressure reinforcement and the like. The invention has the advantages of both gravity type foundation and cylinder type foundation, has wide application range, convenient transportation and installation, recycling and high bearing capacity, can be used as a top bearing type structure, converts the load of the upper fan into the structural controllable tensile and compressive stress through the steel tower cylinder and the linear transition section, and can also be used as a gravity type structure to resist the upper load through the gravity of the upper fan.
Description
Technical Field
The invention relates to the technical field of foundation structures of ocean engineering, in particular to a multi-barrel combined foundation structure and a construction method thereof.
Background
At present, in the offshore wind power field, the form of a fan 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 depends on the self weight of the structure and the weight of the filler and the ballast on the gravity type foundation to resist external load, so that the stability of the structure is maintained, the construction principle is simple, the cost of the filler and the ballast materials is low, and the construction cost is low for a shallow foundation; but the foundation has large dead weight and geometric dimension, the foundation occupies a wider range of the seabed, and has higher requirements on geological conditions, so the gravity foundation has limited applicable water depth range and high cost. The suction type barrel foundation is simple in form, high in bearing capacity, simple in transportation and installation, easy to recover and high in slip resistance stability of the barrel skirt. However, as the water depth increases, the wind wave current load becomes larger, the diameter of the cylinder type foundation required by the large bending moment load is larger, and large equipment is required in the processes of transportation, installation and the like.
Disclosure of Invention
The invention aims to solve the technical problems of unreasonable load transmission, complex construction and installation and difficult leveling of a multi-cylinder foundation of the current offshore foundation structure, and provides the multi-cylinder steel-concrete combined foundation structure and the construction method thereof, which combine the characteristics of low cost, strong bearing capacity, convenient installation, low manufacturing cost and recycling of the cylinder foundation, and have the advantages of high bearing capacity, convenient installation and transportation, wide application range and greatly reduced cost.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the multi-cylinder steel-concrete combined foundation structure comprises a plurality of same steel cylinder foundations, wherein the steel cylinder foundations can form a regular polygon for arrangement on a horizontal plane according to the central point connecting line of the steel cylinder foundations, the tops of the steel cylinder foundations are commonly connected with a steel top plate, and the upper part of the steel top plate is provided with a concrete plate; the center of the steel roof and the center of the concrete slab are respectively provided with a circular through hole, and the circular through holes are not intersected with the projection of the steel cylinder foundation on the steel roof and the concrete slab; the upper part of the concrete slab is provided with a concrete transition section, the concrete transition section is of a linear thin-wall structure with a circular section, and the diameter of a circular ring at the bottom is larger than that of a circular ring at the top; the upper part of the concrete transition section is provided with a steel tower barrel, and the bottom of the steel tower barrel is embedded in the concrete transition section;
the top surface of the concrete slab 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 slab; the middle ring beam is positioned in the middle of the top surface of the concrete slab and is arranged at the lower part of the concrete transition section; the inner ring beam is arranged at the edge of the circular through hole on the top surface of the concrete slab;
concrete main beams are uniformly arranged on the top surface of the concrete slab in the radial direction, and extend from the inner ring beam to the outer ring beam; and concrete secondary beams are radially and uniformly arranged between every two adjacent concrete main beams on the top surface of the concrete slab, and extend from the middle ring beam to the outer ring beam.
Further, the number of the steel cylinder foundations is 3-6; the radius of the steel cylinder foundation is 10-15m, and the height is 8-12m; the clear distance between two adjacent steel cylinder foundations is 1-3 times of the outer diameter of the steel cylinder foundations.
Further, an upward steel rib plate is provided at the periphery of the steel top plate, and the steel rib plate is inserted into the concrete slab and the outer ring beam.
Further, the concrete slab is in accordance with the contour of the steel roof, and the thickness of the concrete slab is 0.3-1m.
Further, the radius of the circular through holes of the center of the steel top plate and the concrete plate is 0.5-1.0 times of the radius of the steel cylinder foundation 1.
Further, the concrete transition section is of an equal-thickness structure, the wall thickness of the concrete transition section is 0.5-1.5m, and prestressed steel strands are distributed in the middle of the concrete transition section.
Further, the outer edge of the outer ring beam is flush with the outer edge of the concrete slab and is consistent in shape with the edge of the concrete slab; the width of the outer ring beam is 0.5-1.5m, and the height is 0.8-1.8m; the middle ring beam is positioned in the middle of the top surface of the concrete slab, is ring-shaped, has the width of 0.5-1.5m and the height of 0.8-1.8m; the radius of the middle ring beam is 1.5-2 times of the radius of the steel tower barrel; the inner diameter of the inner ring beam is consistent with the diameter of the circular through hole, the width is 0.5-1.5m, and the height is 0.8-1.8m.
Further, the width of the concrete girder is 0.5-1.5m, and the height is 0.8-1.8m; the included angle between the adjacent concrete main beams is 60 degrees; the concrete secondary beams comprise 12-18 concrete secondary beams, 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, the steel tower cylinder is a variable-section equal-thickness steel pipe, and the diameter of the bottom is larger than that of the top.
The construction method of the multi-cylinder steel-concrete combined foundation structure comprises the following steps:
(1) Prefabricating a plurality of steel cylinder foundations on land, and welding the steel cylinder foundations with the steel top plate after the steel cylinder foundations are distributed on a horizontal plane according to a regular polygon which can be formed by connecting lines of central points of the steel cylinder foundations;
(2) Binding steel bars on the steel top plate serving as a bottom surface template of the concrete plate, and performing pouring construction on the concrete plate, the outer ring beam, the middle ring beam, the inner ring beam, the concrete main beam, the concrete secondary beam and the concrete transition section together;
(3) Hanging the integral structure with the casting construction into water, checking air tightness, installing the steel tower on the concrete transition section, installing a machine head on the steel tower, and adjusting the draft of the steel cylinder foundation according to towing requirements;
(4) Floating and towing the multi-cylinder steel-concrete combined foundation structure and the machine head;
(5) After the multi-cylinder steel-concrete combined foundation structure and the machine head are towed to a designated sea area in a floating mode, the self weight of the multi-cylinder steel-concrete combined foundation structure and the machine head are sunk to a designated position in advance, and then negative pressure sinking is carried out;
(6) And after sinking, reinforcing the soil body in the steel cylinder foundation.
The beneficial effects of the invention are as follows:
according to the multi-cylinder steel-concrete combined foundation structure, the plurality of single-cylinder foundations are connected into a whole through the steel top plate and the concrete plate, so that the anti-overturning moment of the multi-cylinder steel-concrete combined foundation structure is increased, and the stability in the transportation process is improved; the combination of the concrete slab and the slab beam system effectively transmits and uniformly disperses the upper load, and is approximately converted into tension and pressure at the position of the cylindrical foundation so as to exert the maximum bearing capacity of the cylindrical foundation, and the structural stress system is clear; the concrete transition section adopts a cast-in-situ process, is of an integral structure, and transmits upper load together, so that the integral rigidity of the structure is improved, materials are saved, and the manufacturing cost is reduced. The multi-steel cylinder steel-concrete combined foundation structure has the advantages that the rigidity of the steel top plate is high, the inclination angle of the foundation in the sinking process can be adjusted by adjusting the pressure intensity among the steel cylinders, the rigidity is high, and the smooth leveling of the foundation is facilitated.
The multi-cylinder steel-concrete combined foundation structure has the advantages that the integrity of a plurality of steel cylinder foundations is enhanced due to the connection of the steel top plate, the concrete plate and the concrete transition section, the mutual dislocation among the steel cylinder foundations in the construction process can be effectively improved, the construction quality is improved, meanwhile, the excessive internal force difference among the steel cylinder foundations is avoided, the uneven settlement of the whole multi-cylinder steel-concrete combined foundation structure is reduced, the sinking resistance of the plurality of steel cylinder foundations in water is reduced due to the arrangement of the circular through holes in the middle of the steel top plate and the concrete plate, and the construction is facilitated.
In conclusion, the multi-cylinder steel reinforced concrete combined foundation structure has the advantages of a gravity foundation and a cylinder foundation, is wide in application range, convenient to transport and install, recyclable and high in bearing capacity, can be used as a top-bearing structure, converts an upper fan load into a structurally controllable tensile stress through a steel tower cylinder and a linear transition section, and can also be used as a gravity structure to resist the upper load through self gravity.
The multi-cylinder steel-concrete combined foundation structure can realize the technology of land prefabrication, floating, towing, sinking and leveling in construction, has reliable pouring quality, does not have impact loads such as piling, avoids using large-scale machines such as hoisting equipment and the like at sea in the construction process, reduces construction procedures, reduces the difficulty of offshore operation and the risk of damage to a fan caused by rapid severe change of the marine environment, has simple required equipment, is safe and effective, takes only several hours for offshore installation time, and has short construction period, high efficiency, good quality and high safety compared with the traditional foundation structure, and greatly reduces the installation cost of offshore wind power construction and wind turbine.
Drawings
FIG. 1 is a schematic perspective view of a multi-cylinder reinforced concrete composite foundation structure provided by the invention;
FIG. 2 is a front view of a multi-barrel reinforced concrete composite foundation structure provided by the present invention;
FIG. 3 is a top view of a multi-drum reinforced concrete composite foundation structure provided by the present invention;
fig. 4 is a schematic structural diagram of a reinforced concrete beam slab system in a multi-cylinder reinforced concrete composite foundation structure provided by the invention.
In the figure: 1. a steel cylinder foundation; 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 girder; 8. a concrete secondary beam; 9. a concrete transition section; 10. and a steel tower.
Detailed Description
For further understanding of the invention, the following examples are set forth to illustrate, together with the drawings, the detailed description of which follows:
as shown in fig. 1 to 3, the present embodiment discloses a multi-cylinder steel-concrete composite foundation structure, which comprises a plurality of identical steel cylinder foundations 1, a steel top plate 2, concrete plates 3, an outer ring beam 4, a middle ring beam 5, an inner ring beam 6, a concrete main beam 7, a concrete secondary beam 8, a concrete transition section 9 and a steel tower cylinder 10.
The same steel cylinder foundations 1 are mutually independent, can be distributed on a horizontal plane in a regular polygon according to the central point connecting line of the steel cylinder foundations, and are welded with the steel top plate 2 together at the upper part. The number of the steel cylinder foundations 1 is generally 3-6; the steel cylinder foundation 1 is of a steel cylindrical structure, the radius is 10-15m, and the height is 8-12m. The clear distance between two adjacent steel cylinder foundations 1 is 1-3 times of the outer diameter of the steel cylinder foundations 1.
The steel roof 2 sets up in a plurality of steel cylinder foundations 1 tops, welds with the top surface of steel cylinder foundation 1. The shape of the steel top plate 2 is surrounded by circular arc line segments between the outer common tangent line and the outer common tangent line of the cross section circle of the adjacent steel cylinder foundation 1, and the projection of the center of each circular arc line segment and the center of the cross section circle of the steel cylinder foundation 1 are the same point on the horizontal plane. The thickness of the steel top plate 2 is 0.006-0.01m. The periphery of the steel top plate 2 is provided with upward steel rib plates, and the height of the steel rib plates is the same as the total height of the concrete slab 3 and the outer ring beam 4; the steel rib plates are used for being inserted into the concrete slab 3 and the outer ring beam 4, so that the concrete structure is effectively connected with the plurality of steel cylinder foundations 1 integrally. A circular through hole is formed in the center of the steel top plate 2 and used for reducing sinking resistance of the plurality of steel cylinder foundations 1 in water; the range of the circular through hole does not extend to the position of the steel cylinder foundation 1, namely the circular through hole is not intersected with the projection of the steel cylinder foundation 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 times of the radius of the steel cylinder foundation 1.
The upper part of the steel roof plate 2 is provided with a concrete plate 3, the concrete plate 3 is consistent with the outline of the steel roof plate 2, and the thickness of the concrete plate is 0.3-1m. The concrete slab 3 is poured on the upper part of the steel roof plate 2, and the steel rib plate of the steel roof plate 2 penetrates into the concrete slab 3 upwards, so that the concrete slab 3 and the steel roof plate 2 are firmly combined. The center of the concrete slab 3 is also provided with a circular through hole, the radius of which is consistent with the size of the circular through hole arranged on the steel roof plate 2, and the circular through hole is also used for reducing the sinking resistance of a plurality of steel cylinder foundations 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 outside 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 the edge of the concrete slab 3; the width of the outer ring beam 4 is 0.5-1.5m, and the height is 0.8-1.8m. The middle ring beam 5 is positioned in the middle of the top surface of the concrete slab 3, is ring-shaped, has the width of 0.5-1.5m and the height of 0.8-1.8m; the radius of the middle ring beam 5 is 1.5-2 times of the radius of the steel tower 11. The inner ring beam 7 is arranged at the edge of a 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 0.8-1.8m.
The top surface of the concrete slab 3 is connected with a concrete main beam 7 and a concrete secondary beam 8 between the three ring beams. The concrete main beams 7 are radially and uniformly arranged on the top surface of the concrete slab 3, and extend from the inner ring beams 7 to the outer ring beams 4. In one embodiment of the invention, the concrete main beams 7 comprise 6 concrete main beams, and the included angle between the adjacent concrete main beams 7 is 60 degrees; the width of the concrete girder 7 is 0.5-1.5m, and the height is 0.8-1.8m. The concrete secondary beams 8 are radially and evenly arranged between every two adjacent concrete main beams 7 on the top surface of the concrete slab 3, and extend from the middle ring beam 5 to the outer ring beam 4. In one embodiment of the invention, the concrete secondary beams 8 comprise 12-18 concrete secondary beams 8, 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 portion of the concrete slab 3 is provided with a concrete transition section 9, the concrete transition section 9 is of a linear thin-wall structure with a circular section, and the diameter of a bottom circular ring is larger than that of a top circular ring. The concrete transition section 9 is of an equal-thickness structure, the wall thickness of the concrete transition section is 0.5-1.5m, and prestressed steel strands are distributed in the middle. The annular bottom surface of the concrete transition section 9 is located on the middle ring beam 5, and the annular cross section of the bottom surface and the middle ring Liang Yizhi; the height of the concrete transition 9 is 20-40m. The concrete transition section 10 of the straight thin-walled structure helps to transfer the upper load into the concrete beam slab system and thus spread over the plurality of steel cylinder foundations 1. The concrete transition 9 also increases the dead weight of the entire structure so that the entire structure can utilize the dead weight to resist a portion of the horizontal load.
And a steel tower barrel 10 is connected above the concrete transition section 9, and the bottom end of the steel tower barrel 10 is embedded into the upper part of the concrete transition section 9.
The construction method of the multi-cylinder steel-concrete combined foundation structure comprises the following steps of:
(1) Prefabricating a plurality of steel cylinder foundations 1 on land, arranging the plurality of steel cylinder foundations 1 on a horizontal plane according to a connecting line of central points of the steel cylinder foundations to form a regular polygon, and then welding the regular polygon with a steel top plate 2;
(2) The steel top plate 2 is used as a bottom surface template of the concrete plate 3, steel bars are bound on the steel top plate 2, and pouring construction is carried out 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, the concrete secondary beam 8 and the concrete transition section 9 together;
(3) Hanging the whole structure with the casting construction into water, checking air tightness, installing a steel tower 10 at the upper part of a concrete transition section 9, installing a machine head on the steel tower 10, and adjusting the draft of a steel cylinder foundation according to towing requirements;
(4) Floating and towing the multi-cylinder steel-concrete combined foundation structure and the machine head;
(5) After the multi-cylinder steel-concrete combined foundation structure and the machine head float and tow travel to a designated sea area, the self weight is sunk, and then the negative pressure is sunk to a designated position;
(6) And after sinking, reinforcing the soil body in the steel cylinder foundation 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, not restrictive, and many changes may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are to be construed as falling within the scope of the present invention.
Claims (9)
1. The multi-cylinder steel-concrete combined foundation structure comprises a plurality of same steel cylinder foundations, wherein the steel cylinder foundations can form a regular polygon on a horizontal plane according to the central point connecting line of the steel cylinder foundations; the center of the steel roof and the center of the concrete slab are respectively provided with a circular through hole, and the circular through holes are not intersected with the projection of the steel cylinder foundation on the steel roof and the concrete slab; the upper part of the concrete slab is provided with a concrete transition section, the concrete transition section is of a linear thin-wall structure with a circular section, and the diameter of a circular ring at the bottom is larger than that of a circular ring at the top; the upper part of the concrete transition section is provided with a steel tower barrel, and the bottom of the steel tower barrel is embedded in the concrete transition section;
the top surface of the concrete slab 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 slab; the middle ring beam is positioned in the middle of the top surface of the concrete slab and is arranged at the lower part of the concrete transition section; the inner ring beam is arranged at the edge of the circular through hole on the top surface of the concrete slab;
concrete main beams are uniformly arranged on the top surface of the concrete slab in the radial direction, and extend from the inner ring beam to the outer ring beam; concrete secondary beams are radially and uniformly arranged between every two adjacent concrete main beams on the top surface of the concrete slab, and extend from the middle ring beam to the outer ring beam;
and an upward steel rib plate is arranged at the periphery of the steel top plate, and the steel rib plate is inserted into the concrete plate and the outer ring beam.
2. A multi-cylinder reinforced concrete composite foundation structure according to claim 1, wherein the number of steel cylinder foundations is 3-6; the radius of the steel cylinder foundation is 10-15m, and the height is 8-12m; the clear distance between two adjacent steel cylinder foundations is 1-3 times of the outer diameter of the steel cylinder foundations.
3. A multi-barrel reinforced concrete composite foundation structure according to claim 1 wherein the thickness of the concrete slab is 0.3-1m.
4. The multi-cylinder reinforced concrete composite foundation structure of claim 1, wherein the radius of the circular through hole in the center of the steel roof and the circular through hole in the concrete slab are both 0.5-1.0 times the radius of the steel cylinder foundation.
5. The multi-cylinder steel-concrete combined foundation structure according to claim 1, wherein the concrete transition section is of an equal-thickness structure, the wall thickness of the concrete transition section is 0.5-1.5m, and prestressed steel strands are distributed in the middle of the concrete transition section.
6. A multi-barrel reinforced concrete composite foundation structure according to claim 1 wherein the outer edge of said outer ring beam is flush with the outer edge of said concrete slab and conforms in shape to the edge of said concrete slab; the width of the outer ring beam is 0.5-1.5m, and the height is 0.8-1.8m; the middle ring beam is positioned in the middle of the top surface of the concrete slab, is ring-shaped, has the width of 0.5-1.5m and the height of 0.8-1.8m; the radius of the middle ring beam is 1.5-2 times of the radius of the steel tower barrel; the inner diameter of the inner ring beam is consistent with the diameter of the circular through hole, the width is 0.5-1.5m, and the height is 0.8-1.8m.
7. A multi-cylinder reinforced concrete composite foundation structure according to claim 1, wherein the width of the concrete main beam is 0.5-1.5m and the height is 0.8-1.8m; the included angle between the adjacent concrete main beams is 60 degrees; the concrete secondary beams comprise 12-18 concrete secondary beams, 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. The multi-cylinder steel-concrete composite foundation structure according to claim 1, wherein the steel tower is a variable-section equal-thickness steel pipe, and the bottom diameter is larger than the top diameter.
9. A method of constructing a multi-cylinder steel reinforced concrete composite foundation structure as claimed in any one of claims 1 to 8, comprising the steps of:
(1) Prefabricating a plurality of steel cylinder foundations on land, and welding the steel cylinder foundations with the steel top plate after the steel cylinder foundations are distributed on a horizontal plane according to a regular polygon which can be formed by connecting lines of central points of the steel cylinder foundations;
(2) Binding steel bars on the steel top plate serving as a bottom surface template of the concrete plate, and performing pouring construction on the concrete plate, the outer ring beam, the middle ring beam, the inner ring beam, the concrete main beam, the concrete secondary beam and the concrete transition section together;
(3) Hanging the integral structure with the casting construction into water, checking air tightness, installing the steel tower on the concrete transition section, installing a machine head on the steel tower, and adjusting the draft of the steel cylinder foundation according to towing requirements;
(4) Floating and towing the multi-cylinder steel-concrete combined foundation structure and the machine head;
(5) After the multi-cylinder steel-concrete combined foundation structure and the machine head are towed to a designated sea area in a floating mode, the self weight of the multi-cylinder steel-concrete combined foundation structure and the machine head are sunk to a designated position in advance, and then negative pressure sinking is carried out;
(6) And after sinking, reinforcing the soil body in the steel cylinder foundation.
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