Combined type annular tube jacket foundation structure
Technical Field
The utility model relates to an ocean engineering's foundation structure technical field, specific theory relates to a many section of thick bamboo combination foundation structure.
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.
SUMMERY OF THE UTILITY MODEL
The utility model discloses devoting to solving above-mentioned technical problem, it is big to combine jacket structure adaptation depth of water, barrel-type basis simple to operate, low in cost, but recycle's characteristics, a modular ring tube jacket foundation structure is provided, the advantage on barrel-type basis and jacket basis has concurrently, application scope is wide, transportation simple to operate, but recycle, bear the weight of the dynamic height, can transmit the upper portion fan load to the concrete roof through the jacket structure on, convert the controllable tensile compressive stress of structure into, and then transmit on a plurality of steel drums of lower part.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a combined type annular tube jacket foundation structure comprises a plurality of identical steel tubes, wherein the plurality of steel tubes can form a regular polygon on a horizontal plane according to a central point connecting line, the tops of the plurality of steel tubes are connected with a steel top plate together, and a concrete slab is arranged on the upper portion 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.
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.
The utility model has the advantages that:
the utility model discloses combined the advantage on jacket and barrel type basis, upper portion jacket structure can design according to the condition that on-the-spot stormy waves flowed. 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 utility model discloses have jacket basis light in weight and simple, the transportation of the simple, low characteristics of cost of cartridge type form concurrently, can be applicable to the deep, the abominable sea area of sea state of depth of water. The steel cylinders are welded with each other to form a rigid whole to resist large bending moment load borne by the offshore wind turbine, the steel cylinders with small diameters are stressed in a coordinated mode under the condition of large bending moment, the rigidity is high, the deformation is small, buckling deformation in the sinking process can be reduced, and different negative pressures can be applied to the steel cylinders to level inclination angles generated in the sinking process. The utility model discloses a steel cylinder couples together atress in coordination through steel roof, concrete slab above, and connects through the steel roof between each steel cylinder, when the basis takes place to incline, realizes the leveling through the negative pressure of adjusting in the different steel cylinders, adjusts the inclination and can also avoid jacket structure bottom to take place to warp.
Drawings
Fig. 1 is a schematic perspective view of a combined annular jacket foundation structure provided by the present invention;
fig. 2 is a front view of the combined annular jacket foundation structure provided by the present invention;
fig. 3 is a top view of the combined annular jacket foundation structure provided by the present invention;
fig. 4 is a schematic structural diagram of a reinforced concrete beam slab system in the combined type annular jacket foundation structure provided by the present invention;
fig. 5 is a schematic structural view of a jacket structure in a combined type annular 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 column; 10. a support bar; 11. 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 type annular jacket foundation structure, which includes a plurality of identical steel cylinders 1, steel roof plates 2, concrete plates 3, outer annular beams 4, middle annular beams 5, inner annular beams 6, main concrete beams 7, secondary concrete beams 8, vertical columns 9, support rods 10, and diagonal rods 11.
A plurality of same steel cylinders 1 can form a circle according to the central point connecting line on the horizontal plane and arrange, and every two adjacent steel cylinders 1 are welded together, so that the integral rigidity of the foundation is increased, and the buckling in the sinking process is reduced. The number of the steel cylinders 1 is capable of forming a ring, and is generally 3-8. The steel cylinder 1 is a steel cylindrical structure, the radius is 3-15m, and the height is 8-15 m.
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 steel top plate 2 is generally circular in shape, and the circular shape is tangent to the plurality of steel cylinder foundations 1 simultaneously. 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.
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 an 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 an embodiment of the present invention, the concrete secondary beams 8 include 12 to 18, 2 to 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 to 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 present invention, as shown in fig. 5, the jacket structure is composed of four identical vertical columns 9, a plurality of support rods 10, and eight diagonal rods 11, 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 9 are uniformly distributed on the middle ring beam 5 in the circumferential direction, namely the bottom ends of the four upright posts 9 are connected to form a square, the bottom of each upright post 9 is connected with the middle ring beam 5 through a flange, the four upright posts 9 are inclined towards the center of the foundation structure from bottom to top at the same angle, and the apparent inclination angle is 80-85 degrees. And a plurality of support rods 10 are connected between every two adjacent upright posts 9 to form a truss type steel structure. The outer diameter of the steel pipe of the support rod 10 is 0.3m, and the thickness is 3 mm. Still be provided with a set of (two) down tube 11 between per two adjacent stands 9, every group down tube 11 sets up with the form of falling triangle-shaped, and two 11 upper ends of down tube of every group connect respectively in two stands 9, and two 11 lower extremes of down tube are crossed together and are linked together with interior ring beam 6, and four tie points ring is the equipartition in interior ring beam 6, and four tie point lines constitute the square. The radius of the middle ring beam 5 is 2 times of the radius of the inner ring beam 6. 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 type annular tube jacket foundation structure specifically comprises the following steps:
(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 central point connecting line to form a circle, welding the steel cylinder foundations 1 and a steel top plate 2 together, and welding the steel cylinder foundations 1 and the steel top plate 2 together;
(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 type annular 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 type annular jacket foundation structure;
(5) after the combined type annular tube jacket foundation structure is subjected to floating towing to a designated sea area, the self weight of the foundation structure is firstly utilized for self weight sinking, 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 with reference to the accompanying drawings, the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make various changes without departing from the spirit and the scope of the invention as claimed.