CN110374820B - Combined type ring cylinder buoyancy tank foundation structure and construction method thereof - Google Patents
Combined type ring cylinder buoyancy tank foundation structure and construction method thereof Download PDFInfo
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- CN110374820B CN110374820B CN201910573971.8A CN201910573971A CN110374820B CN 110374820 B CN110374820 B CN 110374820B CN 201910573971 A CN201910573971 A CN 201910573971A CN 110374820 B CN110374820 B CN 110374820B
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- 238000010276 construction Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 173
- 239000010959 steel Substances 0.000 claims abstract description 173
- 230000007704 transition Effects 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 238000009434 installation Methods 0.000 claims abstract description 8
- 230000002787 reinforcement Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 20
- 238000007667 floating Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000002262 irrigation Effects 0.000 claims description 3
- 238000003973 irrigation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000009417 prefabrication Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- F03D13/10—Assembly of wind motors; Arrangements for erecting 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
-
- 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
-
- 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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- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Foundations (AREA)
Abstract
The invention belongs to the technical field of foundation structures of ocean engineering, and discloses a combined type ring cylinder buoyancy tank foundation structure and a construction method thereof, wherein the combined type ring cylinder buoyancy tank foundation structure comprises a plurality of steel cylinder foundations with round center points, the plurality of steel cylinder foundations are welded together, steel buoyancy tanks are commonly connected to the tops of the plurality of steel cylinders, a round through hole is formed in the center of each steel buoyancy tank, and a regular polygon rib plate, a plurality of radial rib plates and a plurality of connecting pieces are arranged in each steel buoyancy tank; the upper part of the steel buoyancy tank is connected with a transition section tower which is used for connecting upper wind power equipment; the construction method comprises the steps of land prefabrication, shore hoisting, water towing, dead weight sinking, negative pressure sinking, water pumping reinforcement, grouting treatment and the like. The invention has the characteristics of jacket foundation, gravity foundation and suction barrel foundation, and has the advantages of improved bearing capacity, simple transportation and installation mode, recycling and greatly reduced construction cost.
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 field of offshore wind power generation, 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 traditional gravity foundation is simple in structure and relatively low in overall manufacturing cost, horizontal force and overturning moment are resisted mainly through dead weight and internal packing to keep stable in structure, but the gravity foundation is only suitable for sea areas with shallower water depths, along with the increase of the water depths, the economy cannot be represented, and the manufacturing cost is higher than that of other types of foundations. Meanwhile, the gravity foundation needs to have higher bearing capacity, so that construction and placement cannot be carried out in a muddy sea area. The suction type barrel foundation is simple in form, high in bearing capacity, simple in transportation and installation, easy to recover, high in barrel skirt anti-slip stability and suitable for shallow sea areas with soft soil and low permeability coefficient. With the increase of water depth, the wind wave current load becomes larger, the diameter of the cylinder type foundation needed by the load with large bending moment is larger, large-scale equipment is needed in the processes of transportation, installation and the like, and the method is difficult to be applied to areas with extremely uneven soil distribution and rock distribution. The jacket structure can avoid complex procedures such as offshore concrete pouring, and has the characteristics of small offshore construction amount, high installation speed, low manufacturing cost, strong environmental bearing capacity, suitability for larger water depth and the like.
Disclosure of Invention
The invention aims to solve the technical problems, combines the characteristics of large adapting water depth, convenient installation, low manufacturing cost, recycling of a cylindrical foundation and strong bearing capacity of a gravity foundation of a jacket structure, and provides a combined annular cylindrical buoyancy tank foundation structure and a construction method thereof.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a combined ring cylinder buoyancy tank foundation structure comprises a plurality of identical steel cylinders, wherein the steel cylinders are distributed in a circular shape on a horizontal plane according to the connecting line of the central points of the steel cylinders, and the steel cylinders are welded together; the tops of the steel cylinders are commonly connected with a steel buoyancy tank, a circular through hole is formed in the center of the steel buoyancy tank, and the circular through hole is not intersected with projections of the steel cylinders;
the steel buoyancy tank is internally provided with a regular polygon rib plate and a plurality of radial rib plates, so that the internal space of the steel buoyancy tank is divided into a plurality of areas; the regular polygon rib plates are positioned in the middle of the steel buoyancy tank and are sequentially surrounded by a plurality of rib plates with the same number as the steel cylinders; radial rib plates are arranged at the joint of every two adjacent rib plates of the regular polygon rib plate along the radial direction; connecting pieces are arranged at the joint of every two adjacent rib plates of the regular polygon rib plate and the middle of each rib plate;
the upper part of the steel buoyancy tank is connected with a transition section tower, and the transition section tower is used for connecting upper wind power equipment; the transition section tower comprises a plurality of same stand columns, and the number of the stand columns is the same as that of the steel cylinders; the bottoms of the upright posts are respectively positioned right above the joint of two adjacent steel cylinders and are connected with the connecting piece arranged at the joint of every two adjacent rib plates of the regular polygon rib plate; a supporting rod is connected between two adjacent upright posts to form a truss type steel structure; a diagonal rod is connected between the upright post and the connecting piece arranged at the middle of each rib plate of the regular polygon rib plate; each upright post is internally provided with a gas-liquid pipeline, a grouting pipeline and a liquid level detection device respectively, the gas-liquid pipeline extends to a plurality of steel cylinders respectively from the upright posts, and the grouting pipeline extends to the inside of each region of the steel buoyancy tank from the upright posts.
Further, each steel cylinder is internally provided with an air pressure sensor for monitoring air pressure change.
Further, the height of the steel buoyancy tank is one tenth to one fifteenth of the outer diameter of the steel buoyancy tank.
Further, the cross section of the steel buoyancy tank is round, and the round is consistent with the diameter of the circumscribed circles of the steel cylinders; the round through hole formed in the center of the steel buoyancy tank is one tenth to one fifth of the outer diameter of the steel buoyancy tank.
Further, the connecting piece is a steel round pipe, the height of the connecting piece is 1.1-1.5 times of the height of the steel buoyancy tank, and the pipe diameter of a part exceeding the height of the steel buoyancy tank is gradually reduced.
Further, the plurality of upright posts are all inclined to the center of the foundation structure at the same angle from bottom to top.
The construction method of the combined type ring cylinder buoyancy tank foundation structure comprises the following steps:
(1) Prefabricating a plurality of steel cylinders, the steel buoyancy tanks and the transition section towers on land, arranging the steel cylinders in a circular shape on a horizontal plane according to the connecting lines of the central points of the steel cylinders, welding the steel cylinders with the steel buoyancy tanks and the transition section towers, and then welding the steel cylinders with the steel buoyancy tanks and the transition section towers to complete the assembly of the combined ring cylinder buoyancy tank foundation structure;
(2) The combined type ring cylinder buoyancy tank foundation structure is suspended into water, air tightness is checked, and the draft of the steel cylinders is adjusted by utilizing the air-liquid pipelines in the upright columns of the transition section tower according to towing requirements to pump or pump from the plurality of steel cylinders; finally, the upright post of the transition section tower is filled with water for liquid sealing;
(3) Floating and towing the combined ring cylinder buoyancy tank foundation structure;
(4) After the combined type ring cylinder buoyancy tank foundation structure is transported to a designated sea area, dead weight sinking is carried out by utilizing the dead weight of the foundation, then negative pressure sinking is carried out on the foundation structure by pumping water from a plurality of steel cylinders through gas-liquid pipelines in the upright post, and the foundation structure is sunk to a designated position;
(5) Continuing pumping water until the sinking is finished, and reinforcing the soil body in the steel cylinder;
(6) After the reinforcement treatment is finished, grouting the steel buoyancy tank by using a grouting pipeline in the upright post;
(7) After the irrigation treatment or the grouting treatment is finished, hoisting the wind power equipment at the upper part, performing water installation, and finishing the construction.
Further, in the floating and towing process of the step (3), through the upright post after the inner water injection liquid seal and the liquid level detection equipment in the upright post, observing the change condition of the liquid after the liquid seal in each upright post, primarily judging whether the foundation structure is in a balanced state or not, and leveling if the foundation structure is inclined from the balanced position.
Further, in the self-weight sinking process of the step (4), the sinking rate of the foundation structure is adjusted by injecting water or pumping water into the steel buoyancy tank.
Further, during the negative pressure sinking of step (4), leveling operation is performed by increasing the pumping rate of the steel cylinder being tilted up and/or by inflating or filling the steel cylinder being tilted down.
The beneficial effects of the invention are as follows:
the invention relates to a combined ring cylinder buoyancy tank foundation structure and a construction method thereof, wherein the combined ring cylinder buoyancy tank foundation structure is formed by combining a plurality of steel cylinders, a steel buoyancy tank and a transition section tower; the upper transition section tower is used as a jacket structure, the middle steel buoyancy tank structure is used as a ballast cabin, the lower steel cylinder structure is used as a suction cylinder type foundation, and the characteristics of the jacket structure, the gravity type structure and the suction cylinder type foundation are achieved.
The upper transition section tower is connected with the steel buoyancy tank through the connecting piece, so that loads such as wind, waves, flow, a fan tower barrel and the like borne by the transition section tower can be uniformly transferred to the steel buoyancy tank, stress concentration is avoided, and the bearing capacity and fatigue strength of the transition section tower are improved.
The middle steel buoyancy tank bears the load transferred by the transition section tower, wherein the polygonal rib plates are welded with the root of the transition section tower through the connecting piece, and the polygonal rib plates are connected with the radial rib plates, so that the transferred load is uniformly dispersed to the whole steel buoyancy tank and transferred to a plurality of steel cylinders at the lower part; meanwhile, each vertex of the upright post and the polygonal rib plate of the transition section tower is positioned right above the tangential point of two adjacent steel cylinders at the lower part, and the deformation of the steel buoyancy tank bottom plate can be effectively reduced due to the fact that the rigidity near the tangential point of the steel cylinders is high. The steel buoyancy tank is used as a solid floating body when the foundation structure sinks, constant buoyancy is provided for the structure, the foundation structure is more stable in the self-weight sinking process, and the sinking rate can be always kept in a controllable and stable range by injecting/pumping water into the foundation structure, so that the foundation is prevented from being damaged due to the fact that the sinking rate of the structure is too large to strike the seabed. After the sinking is finished, grouting or water filling is carried out to the inside of the steel floating box, the foundation can be further tamped, the foundation is formed into a base with an integral structure, the dead weight of the foundation structure is improved, and the capacity of resisting the overturning moment is greatly increased.
The steel cylinders at the lower part can be formed by cutting and welding waste steel pipe piles, so that the material cost is reduced by recycling waste, and the environmental pollution in the manufacturing and processing process is also reduced. In the process of carrying out integral floating transportation, the integral self-floating towing of the structure can be realized by pumping air into the plurality of steel cylinders, and meanwhile, the air pressure in the plurality of steel cylinders changes when the structure inclines and shakes to form a restoring moment, so that the self-floating stability of the structure can be maintained to a great extent. In the process of sinking under negative pressure, the structure can be leveled by changing the pumping speed of a plurality of steel cylinders, the steel cylinders are mutually connected and mutually supported, the lateral rigidity of the steel cylinders is improved, and the buckling phenomenon of the cylinder skirt in the sinking process is prevented. In addition, the steel cylinders are connected with each other, so that the load transferred by the steel floating box can be transferred to soil uniformly, and the combined annular cylinder floating box foundation structure has the characteristic of a cylinder foundation.
Drawings
FIG. 1 is a schematic perspective view of a combined ring cartridge buoyancy tank foundation structure provided by the invention;
FIG. 2 is a schematic top view of a modular ring tank foundation structure according to the present invention;
FIG. 3 is a schematic view of a bottom view of a modular ring tank foundation structure according to the present invention;
FIG. 4 is an exploded view of the combined ring tank foundation structure of the present invention;
FIG. 5 is a schematic view of a steel buoyancy tank in a combined ring cylinder buoyancy tank foundation structure provided by the invention;
FIG. 6 is a schematic view of a transition section in a combined ring tank foundation structure according to the present invention;
in the figure: 1. a steel cylinder; 2. the steel buoyancy tank comprises a steel buoyancy tank body 21, a top plate 22, a bottom plate 23, an outer side plate 24, an inner side plate 25, radial rib plates 26 and pentagonal rib plates; 3. the transition section tower frame 31, the upright posts 32, the supporting rods 33 and the diagonal rods.
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 4, the present embodiment discloses a combined ring-drum buoyancy tank foundation structure, which mainly comprises a plurality of identical steel drums 1, a steel buoyancy tank 2 and a transition section tower 3. The number of the steel cylinders 1 can be three to ten in general, and in this embodiment, five steel cylinders 1 are taken as an example, and the combined type ring cylinder buoyancy tank foundation structure is described in detail.
Five steel cylinders 1 are distributed in a circular shape on a horizontal plane according to the connecting line of the central points of the five steel cylinders, and two adjacent steel cylinders are welded together, so that the overall rigidity of the foundation is increased, and the buckling in the sinking process is reduced. The number of steel cylinders 1 should be able to form a ring, typically 3-10. The steel cylinder 1 is of a steel cylindrical structure with upper and lower openings, the radius is 3-15m, and the height is 8-15m. Each steel cylinder 1 is internally provided with an air pressure sensor for monitoring air pressure change in the steel cylinder 1 in the installation process.
The tops of the five steel cylinders 1 are connected with a steel buoyancy tank 2. The center of the steel buoyancy tank 2 is provided with a circular through hole which is not intersected with the projection of the five steel cylinders 1, and the circular through hole is used for enabling the middle area surrounded by the five steel cylinders 1 to be communicated with the outside so as to avoid interference in the floating and towing and negative pressure sinking processes. The cross section of the steel buoyancy tank 2 is round, and the round is consistent with the diameter of the circumscribed circles of the five steel cylinders 1. The height of the steel buoyancy tank 2 is typically one tenth to one fifteenth of the outer diameter of the steel buoyancy tank 2. The circular through hole formed in the center of the steel buoyancy tank 2 is typically one tenth to one fifth of the outer diameter of the steel buoyancy tank 2.
In one embodiment of the present invention, as shown in fig. 5, the steel buoyancy tank 2 is composed of a top plate 21, a bottom plate 22, an outer side plate 23, an inner side plate 24, radial ribs 25, pentagonal ribs 26, and a connection member 27. The diameters of the top plate 21 and the bottom plate 22 are consistent with the diameters of the circumscribed circles of the five steel cylinders 1, and the centers of the top plate 21 and the bottom plate 22 are provided with round holes with the same diameters, and the diameters of the round holes are one tenth to one fifth of the diameters of the top plate 21 or the bottom plate 22. The top plate 21, the bottom plate 22, the outer side plate 23 and the inner side plate 24 enclose a cylindrical cavity structure with a circular through hole in the middle, and a plurality of radial rib plates 25 and a pentagonal rib plate 26 are arranged in the cylindrical cavity structure to divide the inner space of the steel buoyancy tank 2 into a plurality of areas. Pentagonal rib plates 26 are arranged in the middle position inside the steel buoyancy tank 2, and are sequentially surrounded into a frame structure with a pentagonal cross section, and the five rib plates can be connected with each other through connecting pieces 27. Five radial ribs 25 extend radially from inner panel 24 to outer panel 23 and pass through five apex locations (i.e., every adjacent two rib intersections) of pentagonal ribs 26. The connection members 27 are provided at five apex positions of the pentagonal rib 26 (i.e., at the intersections of every adjacent two ribs), and at the midpoint positions of the respective sides (i.e., at the middle of each rib). The connecting piece 27 is a steel round tube, the height of the connecting piece is generally 1.1-1.5 times of the height of the steel buoyancy tank 2, and the pipe diameter of a part of the connecting piece 27 exceeding the height of the steel buoyancy tank 2 is gradually reduced so as to be convenient for welding with the transition section tower 3.
The upper part of the steel buoyancy tank 2 is connected with a transition section tower 3, and the transition section tower 3 is used for connecting upper wind power equipment. In one embodiment of the invention, as shown in fig. 6, the transition piece tower 3 is composed of five identical columns 31, a plurality of support rods 32, and a plurality of diagonal rods 33, and the number of columns 31 should be the same as the number of steel cylinders 1. The bottoms of the five upright posts 31 are respectively positioned right above the connecting tangent points of the two adjacent steel cylinders 1, the root parts of the upright posts 31 are connected with the connecting pieces 27 (here, the connecting pieces 27 are arranged at the joint of every two adjacent rib plates of the pentagonal rib plates 26), and the five upright posts 31 are inclined to the center of the foundation structure at the same angle from bottom to top. A plurality of support rods 32 are connected between every two adjacent upright posts 31 to form a truss type steel structure. Two diagonal rods 33 are arranged between every two adjacent upright posts 31, the upper ends of the two diagonal rods 33 are connected to the upright posts 31, and the lower ends of the two diagonal rods 33 are intersected together and connected with a connecting piece 27 (here, the connecting piece 27 is arranged in the middle of each rib plate in the pentagonal rib plates 26).
Each upright column 31 is internally provided with a gas-liquid pipeline, a grouting pipeline and a liquid level detection device respectively. The gas-liquid pipeline extends into each steel cylinder 1 from each upright 31, and the grouting pipeline extends into each region of the steel buoyancy tank 2 from each upright. The liquid level detection device is used for judging the air pressure state in the steel cylinder 1 corresponding to the bottom of the upright post 31 by observing the liquid level change of the liquid after the liquid seal in the upright post 31 in the towing process.
The construction method of the combined type ring cylinder buoyancy tank foundation structure comprises the following steps:
(1) Five steel cylinders 1, a steel buoyancy tank 2 and a transition section tower 3 are prefabricated on land, the five steel cylinders 1 are distributed in a circular shape on a horizontal plane according to the central point connecting line of the five steel cylinders 1, then the five steel cylinders 1, the steel buoyancy tank 2 and the transition section tower 3 are welded, and then the assembly of the combined ring-cylinder buoyancy tank foundation structure is completed.
(2) The combined ring cylinder buoyancy tank foundation structure is suspended in water, air tightness is checked, air suction or inflation is carried out from the five steel cylinders 1 by utilizing the air-liquid pipelines in the upright posts 31 of the transition section tower 3 according to towing requirements, and the draft of the steel cylinders 1 is regulated; finally, the column 31 of the transition section tower 3 is filled with water for sealing.
(3) Carrying out floating transportation and towing on the combined ring cylinder buoyancy tank foundation structure; in the floating and towing process, through the upright posts 31 filled with water and sealed by liquid and the liquid level detection equipment in the upright posts 31, the change condition of the liquid sealed by the liquid is observed, whether the foundation structure is in a balanced state is primarily judged, and if the foundation structure is inclined from the balanced position, the foundation structure is leveled.
(4) After the combined type ring cylinder buoyancy tank foundation structure is transported to a designated sea area, the foundation dead weight is utilized to carry out dead weight sinking, and the sinking rate of the foundation structure is adjusted by injecting water or pumping water into the steel buoyancy tank 2 in the process. Then the gas-liquid pipeline in the upright column 31 is utilized to pump water from the five steel cylinders 1 to carry out negative pressure sinking on the foundation structure, and the foundation structure is sunk to a designated position; leveling operations are performed during negative pressure sinking by increasing the pumping rate of the steel cylinder 1 that is tilted up and/or by inflating or filling the steel cylinder 1 that is tilted down.
(5) After sinking, pumping water continuously until the soil body in the steel cylinder 1 is reinforced;
(6) After the reinforcement treatment is completed, grouting the steel buoyancy tank 2 by using a grouting pipeline in the upright column 31 of the transition section tower 3;
(7) After the irrigation treatment or the grouting treatment is finished, hoisting the wind power equipment at the upper part, performing water installation, and finishing the construction.
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 combined type ring cylinder buoyancy tank foundation structure comprises a plurality of identical steel cylinders, and is characterized in that the steel cylinders are distributed in a circular shape on a horizontal plane according to the connecting line of the central points of the steel cylinders, and the steel cylinders are welded together; the tops of the steel cylinders are commonly connected with a steel buoyancy tank, a circular through hole is formed in the center of the steel buoyancy tank, and the circular through hole is not intersected with projections of the steel cylinders; an air pressure sensor for monitoring air pressure change is arranged in each steel cylinder;
the cross section of the steel buoyancy tank is round, and the round is consistent with the diameter of the circumscribed circles of the steel cylinders; the steel buoyancy tank is internally provided with a regular polygon rib plate and a plurality of radial rib plates, so that the internal space of the steel buoyancy tank is divided into a plurality of areas; the regular polygon rib plates are positioned in the middle of the steel buoyancy tank and are sequentially surrounded by a plurality of rib plates with the same number as the steel cylinders; radial rib plates are arranged at the joint of every two adjacent rib plates of the regular polygon rib plate along the radial direction; connecting pieces are arranged at the joint of every two adjacent rib plates of the regular polygon rib plate and the middle of each rib plate;
the upper part of the steel buoyancy tank is connected with a transition section tower, and the transition section tower is used for connecting upper wind power equipment; the transition section tower comprises a plurality of same stand columns, and the number of the stand columns is the same as that of the steel cylinders; the bottoms of the upright posts are respectively positioned right above the joint of two adjacent steel cylinders and are connected with the connecting piece arranged at the joint of every two adjacent rib plates of the regular polygon rib plate; a supporting rod is connected between two adjacent upright posts to form a truss type steel structure; a diagonal rod is connected between the upright post and the connecting piece arranged at the middle of each rib plate of the regular polygon rib plate; each upright post is internally provided with a gas-liquid pipeline, a grouting pipeline and a liquid level detection device respectively, the gas-liquid pipeline extends to a plurality of steel cylinders respectively from the upright posts, and the grouting pipeline extends to the inside of each region of the steel buoyancy tank from the upright posts.
2. A modular ring tank foundation structure as claimed in claim 1 wherein the steel tank has a height of one tenth to one fifteen times the outer diameter of the steel tank.
3. A modular ring tank foundation structure as claimed in claim 1, wherein the circular through hole in the centre of the steel tank is one tenth to one fifth of the outer diameter of the steel tank.
4. The combined type annular cylinder buoyancy tank foundation structure according to claim 1, wherein the connecting piece is a steel round pipe, the height of the connecting piece is 1.1-1.5 times of the height of the steel buoyancy tank, and the pipe diameter of a part exceeding the height of the steel buoyancy tank is gradually reduced.
5. A modular ring tank foundation structure as claimed in claim 1 wherein a plurality of said columns are each inclined at the same angle from bottom to top to the centre of the foundation structure.
6. A method of constructing a modular ring tank foundation structure as claimed in any one of claims 1 to 5, comprising the steps of:
(1) Prefabricating a plurality of steel cylinders, the steel buoyancy tanks and the transition section towers on land, arranging the steel cylinders in a circular shape on a horizontal plane according to the connecting lines of the central points of the steel cylinders, welding the steel cylinders with the steel buoyancy tanks and the transition section towers, and then welding the steel cylinders with the steel buoyancy tanks and the transition section towers to complete the assembly of the combined ring cylinder buoyancy tank foundation structure;
(2) The combined type ring cylinder buoyancy tank foundation structure is suspended into water, air tightness is checked, and the draft of the steel cylinders is adjusted by utilizing the air-liquid pipelines in the upright columns of the transition section tower according to towing requirements to pump or pump from the plurality of steel cylinders; finally, the upright post of the transition section tower is filled with water for liquid sealing;
(3) Floating and towing the combined ring cylinder buoyancy tank foundation structure;
(4) After the combined type ring cylinder buoyancy tank foundation structure is transported to a designated sea area, dead weight sinking is carried out by utilizing the dead weight of the foundation, then negative pressure sinking is carried out on the foundation structure by pumping water from a plurality of steel cylinders through gas-liquid pipelines in the upright post, and the foundation structure is sunk to a designated position;
(5) Continuing pumping water until the sinking is finished, and reinforcing the soil body in the steel cylinder;
(6) After the reinforcement treatment is finished, grouting the steel buoyancy tank by using a grouting pipeline in the upright post;
(7) After the irrigation treatment or the grouting treatment is finished, hoisting the wind power equipment at the upper part, performing water installation, and finishing the construction.
7. The method for constructing a combined type ring-barrel buoyancy tank foundation structure according to claim 6, wherein in the floating towing process of the step (3), the change condition of liquid in each upright post after liquid sealing is observed through the upright post after liquid sealing by internal water injection and liquid level detection equipment in the upright post, whether the foundation structure is kept in a balanced state is primarily judged, and if the foundation structure is inclined from the balanced position, leveling is performed.
8. The method of claim 6, wherein the sinking rate of the foundation structure is adjusted by injecting water or pumping water into the steel buoyancy tank during the self-weight sinking of the foundation structure in the step (4).
9. The method of claim 6, wherein leveling is performed by increasing the pumping rate of the steel cylinder in the upper inclination and/or by inflating or filling the steel cylinder in the lower inclination during the sinking under negative pressure in the step (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910573971.8A CN110374820B (en) | 2019-06-28 | 2019-06-28 | Combined type ring cylinder buoyancy tank foundation structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910573971.8A CN110374820B (en) | 2019-06-28 | 2019-06-28 | Combined type ring cylinder buoyancy tank foundation structure and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110374820A CN110374820A (en) | 2019-10-25 |
| CN110374820B true CN110374820B (en) | 2023-12-19 |
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| CN110949633A (en) * | 2019-11-15 | 2020-04-03 | 中国能源建设集团广东省电力设计研究院有限公司 | Barge type floating fan system and floating fan platform |
| CN111364496A (en) * | 2020-03-25 | 2020-07-03 | 上海勘测设计研究院有限公司 | Jacket spinning pile foundation structure and construction method thereof |
| CN112193390A (en) * | 2020-08-31 | 2021-01-08 | 长江三峡集团福建能源投资有限公司 | Underwater grouting monitoring device for offshore wind turbine jacket |
| CN114232672B (en) * | 2021-12-17 | 2023-04-18 | 天津大学 | Five-cylinder jacket structure for offshore wind power |
| CN114810502B (en) * | 2022-03-04 | 2024-09-17 | 上海理工大学 | Floating wind turbine platform with bionic fractal characteristics |
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