CN210766850U - Ring cylinder reinforced concrete combined foundation structure - Google Patents

Abstract

The utility model belongs to the technical field of basic structures of marine engineering, and discloses a ring-tube steel-concrete composite basic structure, which comprises a plurality of steel tube foundations whose center points are connected to form a circle, the plurality of steel tube foundations are welded together, and a plurality of The upper part of the cylindrical foundation is connected to the steel roof, the steel roof is set with a concrete slab, the top surface of the concrete slab is set with an outer ring beam, a middle ring beam, an inner ring beam, a concrete main beam and a concrete secondary beam, and the upper part of the middle ring beam is connected with a concrete transition section and a concrete transition section. The upper part is set with a steel tower. The utility model has the advantages of both the gravity type foundation and the cylinder type foundation, has a wide range of applications, is convenient for transportation and installation, can be recycled and has a high bearing capacity, and can be used as a top-supporting structure. The upper fan load is converted into a structurally controllable tensile and compressive stress, and it can be used as a gravity structure to resist the upper load through its own gravity.

Description

A ring-tube steel-concrete composite base structure

technical field

The utility model relates to the technical field of the basic structure of marine engineering, in particular to a multi-tube combined basic structure.

Background technique

At present, in the field of offshore wind power, the forms of wind turbine foundation mainly include gravity foundation, jacket foundation, tubular foundation, pile foundation, floating foundation, etc.

The overall gravity type foundation relies on the self-weight of the structure and the weight of the filler and ballast on it to resist external loads and maintain structural stability. The dead weight and geometric size are large, the foundation occupies a wide range of seabed, and the geological conditions are relatively high. Therefore, the applicable water depth range of the gravity foundation is limited and the cost is high. The suction-type cylindrical foundation has a simple form, strong bearing capacity, simple transportation and installation, easy recycling, and high anti-slip stability of the barrel skirt. However, as the water depth increases, the wind, wave and current load becomes larger, the diameter of the cylindrical foundation required for the large bending moment load is larger, and the transportation and installation processes require large equipment.

The increase of the diameter of a single cylindrical foundation causes difficulties in transportation and construction. Compared with the large diameter cylindrical foundation, the small diameter cylindrical foundation has a simple manufacturing process, fast transportation and rapid construction.

Utility model content

The utility model focuses on solving the technical problems of the large bending moment load on the current offshore foundation and the difficulty in manufacturing and hauling the large-diameter cylindrical foundation, and provides a ring-tube steel-concrete composite foundation structure, which combines the convenient installation of a small-diameter steel cylinder, It has the characteristics of low cost, high bearing capacity of the cylindrical foundation, convenient installation and transportation, and can be recycled. It has a wide range of applications and greatly reduces the cost.

In order to solve the above-mentioned technical problems, the utility model is realized through the following technical solutions:

A ring-tube steel-concrete composite base structure comprises a plurality of identical steel tube foundations, the plurality of the steel tube foundations are arranged in a circular shape on a horizontal plane according to the connecting line of their center points, and the plurality of the steel tube foundations are mutually welded together; the tops of a plurality of the steel cylinder foundations are jointly connected with a steel top plate, and a concrete plate is arranged on the upper part of the steel top plate; a circular through hole is opened in the center of the steel top plate and the center of the concrete plate, and the circular The through hole does not intersect with the projection of the steel cylinder foundation on the steel top plate and the concrete slab; a concrete transition section is arranged on the upper part of the concrete slab, and the concrete transition section is a linear thin-walled circular section. structure, and the diameter of the bottom ring is larger than the diameter of the top ring; the upper part of the concrete transition section is provided with a steel tower, and the bottom of the steel tower is embedded inside 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 located at the outer edge of the top surface of the concrete slab; the middle ring beam is located 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 evenly arranged on the top surface of the concrete slab in the radial direction, and the concrete main beams extend from the inner ring beam to the outer ring beam; Concrete secondary beams are evenly arranged radially between the main beams, and the concrete secondary beams extend from the middle ring beam to the outer ring beam.

Further, the number of the steel cylinder foundations is 5-8, and two adjacent steel cylinder foundations are welded to each other through their cylinder skirts; the radius of the steel cylinder foundations is 3-15m, and the height is 8-15m.

Further, an upward steel rib is provided at the periphery of the steel roof, and the steel rib is inserted into the concrete slab and the outer ring beam.

Further, the contours of the concrete slab and the steel top slab are consistent, both are circular or regular polygons, and the thickness of the concrete slab is 0.3-1 m.

Further, the radius of the center of the steel top plate and the circular through hole of the concrete plate are both 0.2-1.0 times the radius of the steel cylinder foundation 1 .

Further, the concrete transition section is an equal-thickness structure with a wall thickness of 0.5-1.5m, and prestressed steel strands are distributed in the middle.

Further, the outer edge of the outer ring beam is flush with the outer edge of the concrete slab, and the shape is consistent with the edge of the concrete slab; the width of the outer ring beam is 0.5-1.5m, and the height is 0.8-1.8 m; the middle ring beam is located in the middle of the top surface of the concrete slab, and is circular in shape, with a width of 0.5-1.5m and a height of 0.8-1.8m; the radius of the middle ring beam is the radius of the steel tower. 1-2 times; 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 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 include 12-18, 2-3 concrete secondary beams are arranged between every two adjacent concrete primary beams, and the included angle between the axes of adjacent concrete secondary beams is 20-30 degrees.

Further, the steel tower is a steel pipe with variable section and equal thickness, and the bottom diameter is larger than the top diameter.

The beneficial effects of the present utility model are:

The ring-tube steel-concrete composite base structure of the utility model connects a plurality of single-tube foundations through a steel roof and a concrete slab into a whole, which is beneficial to increase the anti-overturning moment of the multi-tube steel-concrete composite base structure and improve the stability during transportation; The diameter of each single-cylinder foundation is small and convenient to manufacture and transport. The steel cylinders are welded to each other to form a rigid whole to resist the large bending moment load of the offshore wind turbine. When the small diameter steel cylinder is subjected to a large bending moment, the They are co-operated with each other, the stiffness is large, and the deformation is small, which can reduce the buckling deformation during the settling process, and the inclination angle generated during the settling process can be leveled by applying different negative pressures to each steel cylinder. However, each steel cylinder is independent of each other. In the process of hauling at sea, after a single steel cylinder is damaged, it can continue to be hauled smoothly, and the impact on the foundation floating is small. The utility model is formed by welding a plurality of steel cylinders to each other, the number and arrangement of the steel cylinders can be designed according to different hydrological conditions, and the construction is convenient.

The ring-tube steel-concrete composite base structure of the utility model combines the concrete slab and the slab beam system, effectively transmits and evenly disperses the upper load, and approximately converts it into tension and pressure at the cylindrical foundation, so as to exert the maximum bearing capacity of the cylindrical foundation. , the structural stress system is clear; the concrete transition section adopts the cast-in-place process and is an integral structure, which jointly transmits the upper load, increases the overall rigidity of the structure, saves materials and reduces the cost.

In the ring-tube steel-concrete composite base structure of the utility model, the connection of the steel top plate, the concrete slab and the concrete transition section enhances the integrity of a plurality of steel tube foundations, and can effectively improve the mutual dislocation between the steel tube foundations during the construction process. In other cases, it is beneficial to improve the construction quality, and at the same time avoid the excessive difference in internal force between the steel cylinder foundations, thereby reducing the overall uneven settlement of the multi-cylinder steel-concrete composite foundation structure, and the setting of circular through holes in the middle of the steel roof and the concrete slab is reduced. The sinking resistance of multiple steel cylinder foundations in water is improved, which is convenient for construction.

To sum up, the ring-tube steel-concrete composite foundation structure of the present invention has the advantages of both the gravity type foundation and the cylinder type foundation, has a wide range of applications, is convenient for transportation and installation, can be recycled, and has a high bearing capacity. Through the steel tower and the linear transition section, the upper fan load is converted into a structurally controllable tensile and compressive stress, and it can be used as a gravity structure to resist the upper load through its own gravity.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the ring-tube steel-concrete composite basic structure provided by the present utility model;

Fig. 2 is the front view of the ring-tube steel-concrete composite basic structure provided by the utility model;

Fig. 3 is the top view of the ring-tube steel-concrete composite basic structure provided by the present utility model;

4 is a schematic structural diagram of a reinforced concrete beam-slab system in the ring-tube steel-concrete composite basic structure provided by the present invention.

In the figure: 1. Steel cylinder foundation; 2. Steel roof; 3. Concrete slab; 4. Outer ring beam; 5. Middle ring beam; 6. Inner ring beam; 7. Concrete main beam; 8. Concrete secondary beam; 9. Concrete transition section; 10. Steel tower.

Detailed ways

In order to further understand the content of the invention, features and effects of the present utility model, the following embodiments are exemplified and described in detail as follows in conjunction with the accompanying drawings:

As shown in FIG. 1 to FIG. 3 , the present embodiment discloses a multi-cylinder steel-concrete composite base structure, including a plurality of identical steel cylinder bases 1 , a steel roof 2 , a concrete slab 3 , an outer ring beam 4 , and a middle ring beam 5 , Inner ring beam 6, concrete main beam 7, concrete secondary beam 8, concrete transition section 9, steel tower 10.

A plurality of identical steel cylinder foundations 1 can be arranged in a circle according to the connection of their center points on the horizontal plane, and every two adjacent steel cylinder foundations 1 are welded together to increase the overall rigidity of the foundation and reduce the Buckling during sinking. The number of steel cylinder foundations 1 should be able to form a ring, generally 5-8. The steel cylinder foundation 1 is a steel cylindrical structure with a radius of 3-15m and a height of 8-15m.

The steel top plate 2 is arranged on the tops of the plurality of steel cylinder foundations 1 and is welded with the top surfaces of the steel cylinder foundations 1 . The shape of the steel top plate 2 is generally a circle, and the circle is tangent to the plurality of steel cylinder foundations 1 at the same time. The thickness of the steel top plate 2 is 0.006-0.01m. There is an upward steel rib at the periphery of the steel roof 2, and the height of the steel rib is the same as the total height of the concrete slab 3 and the outer ring beam 4; the steel rib is used to be inserted into the concrete slab 3 and the outer ring beam In 4, the effective connection between the concrete structure and the multiple steel cylinder foundations 1 is realized. A circular through hole is opened in the center of the steel top plate 2 to reduce the sinking resistance of the plurality of steel cylinder foundations 1 in water; the range of the circular through hole does not extend to the location of the steel cylinder foundation 1, that is, the circular through hole The radius of the circular through hole in the center of the steel top plate 2 is generally 0.2-1.0 times the radius of the steel cylinder foundation 1, not intersecting with the projection of the steel cylinder foundation 1 on the steel top plate 2.

The upper part of the steel top plate 2 is provided with a concrete plate 3, the contour of the concrete plate 3 is the same as that 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 2 , and the steel ribs of the steel roof 2 penetrate upward into the concrete slab 3 , so that the concrete slab 3 and the steel roof 2 are firmly combined. A circular through hole is also opened in the center of the concrete plate 3, and the radius of the circular through hole is the same as the size of the circular through hole opened on the steel top plate 2, which is also used to reduce the sinking of a plurality of steel cylinder foundations 1 in water. resistance.

As shown in FIG. 4 , three ring beams are arranged on the top surface of the concrete slab 3 , including an outer ring beam 4 , a middle ring beam 5 , and an inner ring beam 6 . The outer ring beam 4 is located on the outside of the top surface of the concrete slab 3, and its outer edge is flush with the outer edge of the concrete slab 3, and the shape 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 0.8-1.8 m. The middle ring beam 5 is located in the middle of the top surface of the concrete slab 3 and is circular in shape, with a width of 0.5-1.5m and a height of 0.8-1.8m; the radius of the middle ring beam 5 is 1-2 times the radius of the steel tower 11 . 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 the same as the diameter of the circular through hole, with a width of 0.5-1.5m and a height of 0.8-1.8m.

A concrete main beam 7 and a concrete secondary beam 8 are connected between the three ring beams on the top surface of the concrete slab 3 . The concrete main beams 7 are evenly 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 main beams 7 include 6, and the angle between adjacent concrete main beams 7 is 60 degrees; the width of the concrete main beams 7 is 0.5-1.5m, and the height is 0.8- 1.8m. The concrete secondary beams 8 are evenly arranged radially 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 an embodiment of the present invention, the concrete secondary beams 8 include 12-18, and 2-3 concrete secondary beams 8 are arranged between every two adjacent concrete primary beams 7, and adjacent concrete secondary beams 8 The angle between the axes is 20-30 degrees.

The upper part of the concrete slab 3 is provided with a concrete transition section 9, and the concrete transition section 9 is a linear thin-walled structure with circular section, and the diameter of the bottom circular ring is larger than that of the top circular ring. The concrete transition section 9 is an equal-thickness structure with a wall thickness of 0.5-1.5m, and prestressed steel strands are distributed in the middle. The circular bottom surface of the concrete transition section 9 is located on the middle ring beam 5, and the circular section of the bottom surface is consistent with the middle ring beam; the height of the concrete transition section 9 is 20-40m. The concrete transition section 10 of the linear thin-walled structure helps to transmit the upper load into the concrete beam-slab system, and then distributes it to the multiple steel cylinder foundations 1 . In addition, the concrete transition section 9 increases the self-weight of the entire structure, so that the entire structure can use its own weight to resist a part of the horizontal load.

A steel tower 10 is connected above the concrete transition section 9 , and the bottom end of the steel tower 10 is embedded in the upper part of the concrete transition section 9 .

The construction method of the above-mentioned multi-tube steel-concrete composite foundation structure is specifically carried out according to the following steps:

(1) A plurality of steel cylinder foundations 1 are prefabricated on land, and the plurality of steel cylinder foundations 1 are arranged in a circle on the horizontal plane according to the connection of their center points, and then welded to each other, and then the plurality of steel cylinder foundations 1 Welding with the steel top plate 2;

(2) Use the steel top plate 2 as the bottom surface formwork of the concrete slab 3, bind steel bars on the steel top plate 2, and set the concrete slab 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 and the concrete transition section 9 are poured together;

(3) The above-mentioned overall structure completed by the pouring construction is hoisted into the water, the air tightness is checked, the steel tower 10 is installed on the upper part of the concrete transition section 9, and the machine head is installed on the steel tower 10, and the adjustment is made according to the towing requirements. The draft of the steel drum foundation;

(4) Float and tow the multi-tube steel-concrete composite base structure and nose;

(5) After the multi-cylinder steel-concrete composite base structure and the nose are towed to the designated sea area, first carry out self-weight sinking, and then carry out negative pressure sinking to the designated position;

(6) After the subsidence is completed, the soil inside the steel cylinder foundation 1 is reinforced.

Although the preferred embodiments of the present utility model have been described above in conjunction with the accompanying drawings, the present utility model is not limited to the above-mentioned specific embodiments, which are only illustrative and not restrictive. Under the inspiration of the present utility model, those of ordinary skill can also make many specific transformations in the form without departing from the scope of the present invention and the protection scope of the claims, which all fall within the protection scope of the present utility model.

Claims (9)

1. A ring-tube steel-concrete composite base structure, comprising a plurality of identical steel tube foundations, is characterized in that, a plurality of described steel tube foundations are arranged in a circle on a horizontal plane according to the connecting line of their center points, and a plurality of The steel cylinder foundations are welded together; the tops of a plurality of the steel cylinder foundations are commonly connected with a steel top plate, and a concrete plate is arranged on the upper part of the steel top plate; the center of the steel top plate and the center of the concrete plate are both provided with a circular shape a through hole, the circular through hole and the projection of the steel cylinder foundation on the steel roof and the concrete slab do not intersect; a concrete transition section is arranged on the upper part of the concrete slab, and the concrete transition section is a ring The cross-section is a linear thin-walled structure, and the diameter of the bottom ring is larger than the diameter of the top ring; the upper part of the concrete transition section is provided with a steel tower, and the bottom of the steel tower is embedded inside 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 located at the outer edge of the top surface of the concrete slab; the middle ring beam is located 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 evenly arranged on the top surface of the concrete slab in the radial direction, and the concrete main beams extend from the inner ring beam to the outer ring beam; Concrete secondary beams are evenly arranged radially between the main beams, and the concrete secondary beams extend from the middle ring beam to the outer ring beam. 2 . The ring-tube steel-concrete composite base structure according to claim 1 , wherein the number of the steel tube foundations is 5-8, and two adjacent steel tube foundations are welded to each other through their tube skirts. 3 . ; The radius of the steel cylinder foundation is 3-15m and the height is 8-15m. 3 . The ring-tube steel-concrete composite basic structure according to claim 1 , wherein an upward steel rib is arranged at the periphery of the steel roof, and the steel rib is inserted into the concrete slab. 4 . and the outer ring beam. 4. A ring-tube steel-concrete composite base structure according to claim 1, characterized in that, the contours of the concrete slab and the steel top slab are consistent, and both are circular or regular polygons, and the thickness of the concrete slab is 0.3-1m. 5. A ring-tube steel-concrete composite base structure according to claim 1, wherein the radius of the center of the steel top plate and the circular through hole of the concrete slab are both 0.2-1.0 of the radius of the steel cylinder foundation times. 6 . A ring-tube steel-concrete composite base structure according to claim 1 , wherein the concrete transition section is an equal-thickness structure with a wall thickness of 0.5-1.5m, and prestressed steel strands are distributed in the middle. 7 . . 7 . The ring-tube steel-concrete composite base structure according to claim 1 , wherein the outer edge of the outer ring beam is flush with the outer edge of the concrete slab, and the shape is the same as the edge of the concrete slab. 8 . The outer ring beam has a width of 0.5-1.5m and a height of 0.8-1.8m; the middle ring beam is located in the middle of the top surface of the concrete slab, with a circular shape, a width of 0.5-1.5m and a height of 0.8-1.8m; the radius of the middle ring beam is 1-2 times the radius of the steel tower; the inner diameter of the inner ring beam is consistent with the diameter of the circular through hole, and the width is 0.5-1.5m, The height is 0.8-1.8m. 8. A ring-tube steel-concrete composite base 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; adjacent to the concrete main beam The included angle between them is 60 degrees; the concrete sub-beams include 12-18, and 2-3 concrete sub-beams are arranged between every two adjacent concrete main beams, adjacent to the concrete main beams. The angle between the axes of the secondary beams is 20-30 degrees. 9 . The ring-tube steel-concrete composite basic structure according to claim 1 , wherein the steel tower is a steel tube with variable section and equal thickness, and the bottom diameter is larger than the top diameter. 10 .

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