CN110453710A - A combined multi-tube jacket foundation structure and its construction method - Google Patents

Abstract

The invention belongs to the technical field of foundation structures of marine engineering, and discloses a combined multi-tube jacket foundation structure and a construction method thereof. The upper parts of a plurality of steel tubes are connected to a steel roof, and the lower part of the steel roof is between every two adjacent steel tubes. Connect the steel groove, set the concrete slab on the steel roof, set the outer ring beam, the middle ring beam, the inner ring beam, the concrete main beam, and the concrete secondary beam on the top of the concrete slab; the upper part of the middle ring beam and the inner ring beam is used to install the upper wind power The jacket structure of the equipment, the jacket structure includes columns, support rods and diagonal rods; its construction methods include onshore prefabrication, shore commissioning, water towage, negative pressure sinking, negative pressure reinforcement and other steps. The invention has the advantages of both the cylindrical foundation and the jacket foundation, wide application range, convenient transportation and installation, recyclable utilization, and high bearing capacity, and can transfer the upper fan load to the concrete roof through the jacket structure, and convert it into a structural The controlled tensile and compressive stress is transmitted to the lower steel cylinders.

Description

A combined multi-tube jacket foundation structure and its construction method

technical field

The invention relates to the technical field of foundation structure of marine engineering, in particular to a multi-tube composite foundation structure and a construction method thereof.

Background technique

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

The gravity foundation relies on the weight of the structure and the weight of the filler and ballast on it to resist external loads and maintain structural stability. The construction principle is simple, the cost of filler and ballast materials is low, and the construction cost is relatively low for shallow foundations; but the foundation The self-weight and geometric size are large, the foundation occupies a wide range of seabed, and has high requirements on geological conditions. Therefore, the gravity-type foundation is applicable to a limited range of water depth and high cost.

The jacket foundation has good integrity, light weight, high structural strength, strong bearing capacity, less impact from wave currents, and easier construction; however, the on-site operation time is long, and the cost increases exponentially with the increase of water depth. The applicable water depth range is also limited.

The suction-type tubular foundation has simple form, strong bearing capacity, simple transportation and installation, easy recycling, and high stability of the tubular skirt against slipping. However, as the water depth increases, the wind, wave and current loads become larger, and the diameter of the cylindrical foundation required for large bending moment loads is larger, and large-scale equipment is required for transportation and installation.

Contents of the invention

The present invention focuses on solving the above-mentioned technical problems, and provides a combined multi-tube jacket foundation structure and its construction method in combination with the characteristics of the jacket structure adapting to large water depths, convenient installation, low cost, and recyclability of the cylindrical foundation. It has the advantages of cylindrical foundation and jacket foundation, wide application range, convenient transportation and installation, recyclable utilization, and high bearing capacity. It can transfer the upper fan load to the concrete roof through the jacket structure and convert it into structurally controllable tension and compression. The stress is then transmitted to the lower steel cylinders.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

A combined multi-tube jacket foundation structure, including a plurality of identical steel tubes, which can be arranged on a horizontal plane to form a regular polygon according to the line connecting their center points, and the tops of the multiple steel tubes are connected together There is a steel top plate, the lower part of the steel top plate is connected with a steel groove between every two adjacent steel cylinders, the steel groove opens downward and connects a plurality of steel cylinders to each other, the steel A concrete slab is arranged on the top of the top slab; the center of the steel top slab and the center of the concrete slab are provided with a circular through hole, and the projection of the circular through hole and the steel cylinder on the steel top slab and the concrete slab not intersect;

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 inner ring beam is arranged on the top surface of the concrete slab At the edge of the circular through hole; the middle ring beam is located between the outer ring beam and the inner ring beam; the concrete main beam is evenly arranged radially on the top surface of the concrete slab, and the concrete main beam is composed of The inner ring beam extends to the outer ring beam; concrete secondary beams are evenly arranged radially between every two adjacent concrete main beams on the top surface of the concrete slab, and the concrete secondary beams are formed by the a middle ring beam extending to said outer ring beam;

The upper part of the middle ring beam and the inner ring beam is connected with a jacket structure for installing upper wind power equipment. The jacket structure includes a plurality of identical columns, and the bottoms of the plurality of columns are evenly distributed on the middle ring beam It is connected with the middle ring beam through a flange; a support rod is connected between two adjacent columns to form a truss-type steel structure; a diagonal bar is connected between the lower part of the column and the inner ring beam.

Further, the number of the steel cylinders is 3-8; the radius of the steel cylinders is 10-15m, and the height is 8-12m; the net distance between two adjacent steel cylinders is the outer diameter of the steel cylinders 1-3 times.

Further, upward steel ribs are provided on the periphery of the steel roof, and the steel ribs are inserted into the concrete slab and the outer ring beam.

Further, the concrete slab is consistent with the outline of the steel roof, and the thickness of the concrete slab is 0.3-1m; the center of the steel roof and the radius of the circular through hole of the concrete slab are the steel cylinder 0.5-1.0 times the radius.

Further, the steel groove is welded to the steel top plate and the side wall of the steel cylinder, and the height of the steel groove is 0.2-0.3 times the height 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 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 0.8-1.8m m; the middle ring beam is located in the middle of the top surface of the concrete slab, has a circular shape, a width of 0.5-1.5m, and a height of 0.8-1.8m; the outer radius of the middle ring beam is 1.5 of the radius of the steel cylinder -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 angle between 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 main beams, and the included angle between the axes of adjacent concrete secondary beams is 20-30 degrees.

Further, the plurality of upright columns all incline toward the center of the basic structure at the same angle from bottom to top.

A construction method of the combined multi-tube jacket foundation structure is carried out according to the following steps:

(1) A plurality of said steel cylinders are prefabricated on land, and a plurality of said steel cylinders can be arranged on a horizontal plane according to a line connecting their center points to form a regular polygon, and are connected with said steel grooves and said steel cylinders. The top plate is welded;

(2) Using the steel roof as the bottom formwork of the concrete slab, binding steel bars on the steel roof, the concrete slab, the outer ring beam, the middle ring beam, the inner ring beam, the The concrete main beam and the concrete secondary beam are poured together;

(3) The upper part of the middle ring beam and the inner ring beam is connected to the jacket structure;

(4) hoist the combined multi-tube jacket foundation structure completed by the above-mentioned pouring construction into the water, and check the air tightness; adjust the draft of the steel cylinder according to the towage requirements;

(5) Floating and towing the combined multi-tube jacket foundation structure and the nose;

(6) After the combined multi-tube jacket foundation structure is floated and towed to the designated sea area, it first sinks under its own weight, and then sinks to the designated position under negative pressure;

(7) After the subsidence is completed, negative pressure reinforcement is performed on the soil inside the steel cylinder.

The beneficial effects of the present invention are:

The invention combines the advantages of the jacket and the cylindrical foundation, and the upper jacket structure can be designed according to the wind, wave and flow conditions on site. The structure foundation of the jacket has good integrity, light weight, high structural strength, strong bearing capacity, less impact from waves and currents, and easier construction. The suction-type tubular foundation has simple form, strong bearing capacity, simple transportation and installation, easy recycling, and high stability of the tubular skirt against slipping. The invention has the characteristics of light weight of the foundation of the jacket, simple cylindrical form, convenient transportation and low cost, and can be applied to sea areas with deep water depth and bad sea conditions. The steel cylinders of the present invention are connected by the upper steel roof and the concrete slab to jointly bear the force, and the steel cylinders are connected by the steel roof. When the foundation is tilted, the leveling is realized by adjusting the negative pressure in different steel cylinders. Adjusting the inclination also avoids deformation of the bottom of the jacket structure.

Description of drawings

Fig. 1 is the three-dimensional schematic diagram of the basic structure of the combined multi-barrel jacket provided by the present invention;

Fig. 2 is the front view of the combined multi-barrel jacket basic structure provided by the present invention;

Fig. 3 is the top view of the basic structure of the combined multi-barrel jacket provided by the present invention;

Fig. 4 is the structural representation of the reinforced concrete beam-slab system in the combined multi-tube jacket foundation structure provided by the present invention;

Fig. 5 is a structural schematic diagram of the jacket structure in the combined multi-barrel jacket foundation structure provided by the present invention.

In the figure: 1. Steel cylinder; 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. Steel Groove making; 10, column; 11, support rod; 12, oblique rod.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

As shown in Figures 1 to 3, this embodiment discloses a combined multi-tube jacket foundation structure, including multiple identical steel tubes 1, steel roof 2, concrete slab 3, outer ring beam 4, and middle ring beam 5 , Inner ring beam 6, concrete main beam 7, concrete secondary beam 8, steel groove 9, column 10, support rod 11, oblique rod 12.

A plurality of identical steel cylinders 1 are arranged on the horizontal plane to form a regular polygon according to the line connecting their center points, and are welded together with the steel top plate 2 at the upper part. The number of steel cylinders 1 is generally 3-8; the steel cylinder 1 is a steel cylindrical structure with a radius of 10-15m and a height of 8-12m. The clear distance between two adjacent steel cylinders 1 is 1-3 times of the outer diameter of the steel cylinders 1 .

The steel top plate 2 is arranged on the top of a plurality of steel cylinders 1 and welded to the top surface of the steel cylinders 1 . The shape of the steel top plate 2 is surrounded by the outer common tangent of the circular cross-section of the adjacent steel cylinder 1 and the arc line segment between the outer common tangent. same point. The thickness of the steel top plate 2 is 0.006-0.01m. An upward steel rib plate is arranged on the periphery of the steel roof 2, and the height of the steel rib plate is the same as the total height of the concrete slab 3 and the outer ring beam 4; the steel rib plate is used to be inserted into the concrete slab 3 and the outer ring beam In step 4, the effective connection between the concrete structure and the plurality of steel cylinder foundations 1 as a whole is realized. There is a circular through hole in the center of the steel top plate 2, which is used to reduce the sinking resistance of multiple steel cylinders 1 in water; The projections of the cylinder 1 on the steel roof 2 do not intersect, and the radius of the circular through hole in the center of the steel roof 2 is generally 0.5-1.0 times the radius of the steel cylinder 1 .

Every two adjacent steel cylinders 1 are connected to each other by a steel groove 9 , and the top of the steel groove 9 is welded to the steel top plate 2 . The steel groove 9 is a lower opening groove structure formed by welding steel plates. The width of the steel groove 9 (that is, the direction perpendicular to the center line of the two steel cylinders 1) is 0.4-0.8 times the diameter of the steel cylinder 1, and the height It is 0.2-0.3 times of the height of the steel cylinder 1; the above dimensions can be adjusted according to the actual situation. After the basic structure is installed in place, the steel groove 9 is inserted into the soil together with the steel cylinder 1 to jointly bear the upper load.

The upper part of the steel roof 2 is provided with a concrete slab 3, the concrete slab 3 is consistent with the outline of the steel roof 2, and the thickness of the concrete slab is 0.3-1m. The concrete slab 3 is poured on the upper part of the steel roof 2, and the steel ribs of the steel roof 2 go deep 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 slab 3, and the radius of the circular through hole is consistent with the size of the circular through hole on the steel roof 2, which is also used to reduce the sinking resistance of multiple steel cylinders 1 in water .

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 outside the top surface of the concrete slab 3, its outer edge is flush with the outer edge of the concrete slab 3, and its shape is consistent with the edge of the concrete slab 3; the outer ring beam 4 has a width of 0.5-1.5m and a height of 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 outer radius of the middle ring beam 5 is 1.5-2 times 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 0.8-1.8m.

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 beam 7 is evenly arranged radially on the top surface of the concrete slab 3 and extends from the inner ring beam 7 to the outer ring beam 4 . In one embodiment of the present invention, the concrete main beams 7 include six, 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 m. Concrete secondary beams 8 are evenly arranged radially between every two adjacent concrete main beams 7 on the top surface of concrete slab 3 , extending from middle ring beam 5 to outer ring beam 4 . In one embodiment of the present invention, the concrete secondary beams 8 include 12-18, 2-3 concrete secondary beams 8 are arranged between every two adjacent concrete main beams 7, and the axis of the adjacent concrete secondary beams 8 The angle between them is 20-30 degrees.

The upper parts of the middle ring beam 5 and the inner ring beam 6 are connected to the jacket structure, and the jacket structure is used to connect the upper wind power equipment. In one embodiment of the present invention, as shown in Figure 5, the jacket structure is composed of four identical columns 10, several support rods 11, and eight oblique rods 12, and the overall height of the jacket structure is 50m. The outer diameter of the steel pipe of the column 10 is 0.5m, and the thickness is 5mm. The bottoms of the four columns 10 are evenly distributed in the ring direction on the middle ring beam 5, that is, the bottom ends of the four columns 10 are connected to form a square, and the bottom of each column 10 is connected to the middle ring beam 5 through a flange, and the four columns 10 are formed by Slope toward the center of the base structure at the same angle from bottom to top, with an apparent inclination angle of 80-85 degrees. A number of support rods 11 are connected between every two adjacent columns 10 to form a truss-type steel structure. The outer diameter of the steel pipe of the support rod 11 is 0.3m, and the thickness is 3mm. Also be provided with one group (two) oblique rods 12 between every two adjacent columns 10, each group of oblique rods 12 is arranged in the form of an inverted triangle, and the upper ends of the two oblique rods 12 of each group are respectively connected to two upright columns 10, two The lower ends of the oblique rods 12 converge together and are connected to the inner ring beam 6, and the four connection points are evenly distributed in the inner ring beam 6 in the circumferential direction, and the connecting lines of the four connection points form a square. Therefore, the radius of the middle ring beam 5 is equal to the radius of the inner ring beam 6 times. The jacket structure helps to transfer the upper load to the concrete beam-slab system, and then distributes it to multiple steel cylinders 1 . In addition, the jacket has good structural integrity, is less affected by wind and waves, and has high structural strength, which is conducive to bearing external loads.

The construction method of the above-mentioned combined multi-tube jacket foundation structure is specifically carried out in accordance with the following steps:

(1) A plurality of steel cylinders 1 are prefabricated on land, and a plurality of steel cylinders 1 are arranged on the horizontal plane to form a regular polygon according to the line connecting their center points, and the steel cylinders 1 are connected with the steel groove 9 and the steel top plate 2 connected by welding;

(2) The steel roof 2 is used as the bottom surface formwork of the concrete slab 3, and steel bars are bound on the steel roof 2, and 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 Carry out pouring construction together;

(3) Connect the jacket structure on the upper part of the middle ring beam 5 and the inner ring beam 6, including the column 10, the support rod 11, and the diagonal rod 12;

(3) Hoist the combined multi-tube jacket foundation structure completed by the above pouring construction into the water to check the airtightness; adjust the draft of the steel cylinder 1 according to the towing requirements;

(4) Floating and towing the combined multi-tube jacket foundation structure;

(5) After the combined multi-tube jacket foundation structure is floated and towed to the designated sea area, the foundation structure is first sunk by its own weight, and then the foundation structure is sunk by negative pressure to the designated position ; The subsidence process can be used to level the foundation structure through the pump system;

(6) Continue pumping negative pressure for a period of time after sinking to reinforce the soil inside the steel cylinder 1 .

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, without departing from the purpose of the present invention and the scope of protection of the claims, personnel can also make specific changes in many forms, and these all belong to the protection scope of the present invention.

Claims (9)

1. a kind of more jacket frame foundation structures of combined type, including multiple identical steel cylinders, multiple steel cylinders in the horizontal plane according to Its central point line can constitute a regular polygon and arrange, which is characterized in that common connection at the top of multiple steel cylinders There is steel top plate, steel top plate lower part is connected with steel groove, the steel groove between the every two adjacent steel cylinder Open Side Down and multiple steel cylinders are connected to each other, and steel top plate top is provided with concrete slab；The steel roof center and institute It states concrete slab center and offers circular through hole, the circular through hole and the steel cylinder are in the steel top plate and the concrete Projection on plate is non-intersecting；

The concrete slab top surface is provided with outer-ring beam, middle ring beam, inner ring beam；The outer-ring beam is located at the concrete slab top surface Outer ledge at；The inner ring beam is set to the edge of the circular through hole of the concrete slab top surface；The middle ring Beam is between the outer-ring beam and the inner ring beam；The concrete slab top surface is radially uniform to be disposed with concrete girder, institute It states concrete girder and the outer-ring beam is extended to by the inner ring beam；The concrete slab top surface is adjacent described mixed at every two Radially uniform between solidifying soil girder to be disposed with concrete secondary beam, the concrete secondary beam extends to the outer ring by the middle ring beam Beam；

The middle ring beam and the inner ring beam top are connected with the jacket structure for installing top wind power equipment, the conduit Frame structure includes more identical columns, and the bottom of the more columns is evenly arranged on the middle ring beam and leads to the middle ring beam Cross flanged joint；It is connected with support rod between adjacent two columns and constitutes truss type steel structure；The column lower part and institute It states and is connected with brace between inner ring beam.

2. more jacket frame foundation structures of a kind of combined type according to claim 1, which is characterized in that the number of the steel cylinder Amount is 3-8；The radius of the steel cylinder is 10-15m, is highly 8-12m；The clear distance of the two neighboring steel cylinder is the steel 1-3 times of cylinder outer diameter.

3. more jacket frame foundation structures of a kind of combined type according to claim 1, which is characterized in that the steel top plate week Upward steel floor is provided at side, the steel floor is inserted in the concrete slab and the outer-ring beam.

4. more jacket frame foundation structures of a kind of combined type according to claim 1, which is characterized in that the concrete slab It is consistent with the profile of the steel top plate, the concrete slab with a thickness of 0.3-1m；The steel roof center and the concrete The radius of the circular through hole of plate is 0.5-1.0 times of the steel cylinder radius.

5. more jacket frame foundation structures of a kind of combined type according to claim 1, which is characterized in that the steel groove There is welding with the steel top plate and the steel cylinder side wall, the height of the steel groove is the 0.2-0.3 of the steel cylinder height Times.

6. more jacket frame foundation structures of a kind of combined type according to claim 1, which is characterized in that the outer-ring beam Outer rim is flushed with the concrete slab outer rim, and shape is consistent with the edge of the concrete slab；The width of the outer-ring beam is 0.5-1.5m is highly 0.8-1.8m；The middle ring beam is located in the middle part of the concrete slab top surface, and shape is circular ring shape, width It is highly 0.8-1.8m for 0.5-1.5m；The outer radius of the middle ring beam is 1.5-2 times of the steel cylinder radius；In described The internal diameter of ring beam is consistent with the diameter of the circular through hole, width 0.5-1.5m, is highly 0.8-1.8m.

7. more jacket frame foundation structures of a kind of combined type according to claim 1, which is characterized in that the concrete master The width of beam is 0.5-1.5m, is highly 0.8-1.8m；Angle between the adjacent concrete girder is 60 degree；The coagulation Native secondary beam includes 12-18 root, is disposed with concrete secondary beam, phase described in 2-3 root between the every two adjacent concrete girders Angle between the adjacent concrete secondary beam axis is 20-30 degree.

8. more jacket frame foundation structures of a kind of combined type according to claim 1, which is characterized in that described in described more Column is tilted with identical angle to foundation structure center from the bottom to top.

9. a kind of construction method of more jacket frame foundation structures of the combined type as described in claim 1-8, which is characterized in that according to Following steps carry out:

(1) the multiple steel cylinders of land fabrication can constitute multiple steel cylinders according to its central point line in the horizontal plane One regular polygon is arranged, and is welded with the steel groove and the steel top plate；

(2) using the steel top plate as the bottom surface template of the concrete slab, the assembling reinforcement on the steel top plate, to described mixed Concrete board, the outer-ring beam, the middle ring beam, the inner ring beam, the concrete girder, the concrete secondary beam carry out together Pouring construction；

(3) the middle ring beam connects the jacket structure with the inner ring beam top；

(4) more jacket frame foundation structures of the combined type that above-mentioned pouring construction is completed are hung in water, checks air-tightness；Root The drinking water of the adjusting steel cylinder is required according to towage；

(5) more jacket frame foundation structures of the combined type and the head are subjected to transportation by driving towage；

(6) more jacket frame foundation structure transportation by driving towages of the combined type are first subjected to self weight sinking to after arriving specified sea area, then It carries out negative pressure and sinks to designated position；

(7) negative pressure reinforcing is carried out to the soil body inside the steel cylinder after sinking.