CN110424442A - A kind of elasticity transition section cylinder-shaped 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 cylindrical foundation structure of an elastic transition section and a construction method thereof. Concrete slabs are set, and beam-slab systems are distributed on the concrete slabs. A concrete transition section is located on the middle ring beam. The upper part of the concrete transition section is embedded and connected with a steel tower. The upper and lower connections of the steel tower are connected by elastic buffer devices. It is in contact with the concrete transition section and the inner ring beam; its construction method includes steps such as land prefabrication, shore hoisting, water towing, negative pressure sinking, and negative pressure reinforcement. The invention has the advantages of a cylindrical foundation, wide application range, convenient transportation and installation, recyclable utilization, high bearing capacity, and the upper load can be transmitted to the transition section and the beam-slab system through the elastic buffer device of the upper and lower parts during the construction period and the operation period superior.

Description

A tubular foundation structure with elastic transition section and its construction method

technical field

The invention relates to the technical field of foundation structures of ocean engineering, in particular to a cylindrical foundation structure and a construction method thereof.

Background technique

The transition section of the offshore wind turbine foundation is a force-transmitting structure, which is related to whether the foundation structure can convert the upper load into controllable stress and transmit it to the foundation, so as to maximize the bearing capacity of the foundation. As the water depth increases, the environmental loads on the foundation and the loads transmitted by the upper fan increase, so a larger transition section structure is required. It is necessary to propose a transition section structure with more effective load transfer and higher safety.

Contents of the invention

The present invention focuses on solving the technical problems of unreasonable load transfer and complicated construction and installation of the current offshore cylindrical foundation structure, and provides a cylindrical foundation structure with an elastic transition section and its construction method, which skillfully integrates the upper structure during the construction period and the operation period. Loads are efficiently transferred to the rectilinear transition and the concrete roof, which in turn transfers to the lower barrel foundation.

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

A cylindrical foundation structure for an elastic transition section, comprising a steel cylinder structure with a subdivision structure, characterized in that a steel roof is connected to the top of the steel cylinder structure, and a concrete slab is arranged on the top of the steel roof, and the concrete slab The upper part is provided with a concrete transition section, and the concrete transition section is a linear thin-walled structure with a ring section, and the diameter of the bottom ring is larger than that of the top ring; the upper part of the concrete transition section is provided with a section of steel tower. The lower part of the steel tower passes through the concrete transition section and is in contact with the concrete slab;

The top surface of the concrete slab is provided with an outer ring beam, a middle ring beam, a first inner ring beam, and a second 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 at the The middle part of the top surface of the concrete slab is arranged at the lower part of the concrete transition section; the first inner ring beam is arranged inside the steel tower, and the second inner ring beam is arranged outside the steel tower; The bottom end of the steel tower is inserted between the second inner ring beam and the first inner ring beam;

Concrete main beams are uniformly arranged radially on the top surface of the concrete slab, and the concrete main beam extends from the second inner ring beam to the outer ring beam; Concrete secondary beams are evenly arranged radially between the concrete main beams, and the concrete secondary beams extend from the middle ring beam to the outer ring beam;

The contact between the steel tower and the top of the concrete transition section is through an elastic buffer device, between the bottom of the steel tower and the first inner ring beam, and between the bottom of the steel tower and the first inner ring beam. The two inner ring beams are in contact with each other through elastic buffer devices.

Further, the radius of the steel cylinder structure is 10-25m, the height is 5-15m, and the thickness of the cylinder wall is 10-50mm.

Further, the steel cylinder structure is divided into a plurality of compartments by a subdivision plate, and the plurality of compartments include a middle cabin and a plurality of side tanks surrounding the middle cabin; the wall of the steel cylinder structure and the division plate Spaces, subdivision plates and subdivision plates are connected to each other by welding.

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

Further, the steel cylinder structure is consistent with the contours of the concrete slab and the steel roof, and the thickness of the concrete slab is 0.3-1m.

Further, the concrete transition section is a constant-thickness structure with a wall thickness of 0.5-1.5m and prestressed steel strands 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 0.8-1.8m m; the middle ring beam is located in the middle of the top surface of the concrete slab, in the shape of a ring, 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 1.5-2.5 times; the outer diameter of the first inner ring beam is 0.2m-1m smaller than the inner diameter of the steel tower, the width is 0.5-2.5m, and the height is 0.8-1.8m; the second inner ring beam The inner diameter is 0.2m-1m larger than the outer diameter of the steel tower, the width is 0.5-2.5m, 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 elastic buffer device 12 is composed of a waterproof layer a, an anti-oxidation layer b, an elastic metal coil c, a first rubber layer d, a rubber raised layer e, and a second rubber layer f, with a thickness of 0.2-1 m. The height is 0.8-1.8m.

A construction method for the above-mentioned tubular foundation structure of the elastic transition section is carried out according to the following steps:

(1) After the steel cylinder structure with subdivision structure is prefabricated on land, the steel cylinder structure and the steel roof are 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, and the first inner ring beam , the second inner ring beam, the concrete main beam, the concrete secondary beam and the concrete transition section are poured together;

(3) Hang the overall structure completed by the above-mentioned pouring construction into the water, check the air tightness, install the steel tower on the concrete slab, and connect the bottom of the steel tower with the first inner ring beam. Elastic buffer devices are installed between the bottom of the steel tower and the second inner ring beam, and between the steel tower and the top of the concrete transition section, and on the steel tower Install the nose, adjust the draft of the steel cylinder structure according to the towing requirements;

(4) Carrying out floating towage with the cylindrical foundation structure of the elastic transition section and the nose;

(5) After the elastic transition section cylindrical foundation structure and the nose are floated and towed to the designated sea area, firstly sink by self-weight, and then sink to the designated position under negative pressure;

(6) Reinforcing the soil inside the steel cylinder structure after the sinking is completed.

The beneficial effects of the present invention are:

The cylindrical foundation structure of the elastic transition section of the present invention integrates the steel cylinder structure with subdivision structure with the steel roof and the concrete slab, which is beneficial to increase the anti-overturning moment of the steel cylinder structure and improve the stability during transportation; the steel cylinder The structure is directly connected to the concrete slab and the combination of the slab-beam system effectively transmits and evenly disperses the upper load, which is approximately converted into tension and pressure at the cylindrical foundation, so as to exert the maximum bearing capacity of the cylindrical foundation, and the structural stress system is clear; The concrete transition section adopts cast-in-place technology, which 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 cylindrical foundation structure of the elastic transition section of the present invention, there are elastic buffer devices between the steel tower and the concrete transition section, and between the steel tower and the two inner ring beams, so that the upper bending moment load can be effectively transmitted. At the same time, it can also dissipate part of the load and prevent the hard contact between the steel tower and the concrete structure from crushing the concrete.

The tubular foundation structure of the elastic transition section of the present invention can realize the technology of "prefabrication on land - floatation - towage - sinking - leveling" during construction, the pouring quality is reliable, there is no impact load such as piling, and the construction process avoids The use of large machinery such as lifting equipment at sea reduces the construction process, reduces the difficulty of offshore operations and the risk of damage to wind turbines due to rapid and harsh changes in the marine environment, the required equipment is simple, safe and effective, and the offshore installation time only takes a few hours , Compared with the traditional infrastructure construction period is short, high efficiency, good quality, high safety, greatly reduce the cost of offshore wind power construction and wind turbine installation.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the cylindrical foundation structure of the elastic transition section provided by the present invention;

Fig. 2 is the front view of the cylindrical foundation structure of the elastic transition section provided by the present invention;

Fig. 3 is a top view of the cylindrical foundation structure of the elastic transition section provided by the present invention;

Fig. 4 is the schematic structural view of removing the transition section part in the elastic transition section cylindrical foundation structure provided by the present invention;

Fig. 5 is a cross-sectional view of the elastic buffer structure in the cylindrical foundation structure of the elastic transition section provided by the present invention.

In the figure: 1. Steel cylinder structure; 2. Steel roof; 3. Concrete slab; 4. Outer ring beam; 5. Middle ring beam; 6. First inner ring beam; 7. Second inner ring beam; 8. Concrete main Beam; 9. Concrete secondary beam; 10. Concrete transition section; 11. Steel tower.

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 cylindrical foundation structure in the elastic transition section, which includes a steel cylinder structure 1 with a compartment structure, a steel roof 2, a concrete slab 3, an outer ring beam 4, a middle ring Beam 5, first inner ring beam 6, second inner ring beam 7, concrete main beam 8, concrete secondary beam 9, concrete transition section 10, steel tower tube 11.

The steel cylinder structure 1 has a radius of 10-25m, a height of 5-15m, and a cylinder wall thickness of 10-50mm. The steel cylinder structure 1 is divided into a plurality of cabins by dividing panels, and the plurality of cabins include a middle cabin and a plurality of side tanks surrounding the middle cabin. The wall of the steel cylinder structure 1 and the compartment plate, and the compartment plate and the compartment plate are all connected to each other by welding.

The steel top plate 2 is arranged on the top of the steel cylinder structure 1 and welded to the top of the steel cylinder structure 1 . The steel top plate 2 is circular in shape and has a thickness of 0.006-0.01m. An upward steel rib is arranged on the circumference 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 steel cylinder structure 1 is realized.

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.

As shown in FIG. 4 , four ring beams are arranged on the top surface of the concrete slab 3 , including an outer ring beam 4 , a middle ring beam 5 , a first inner ring beam 6 , and a second inner ring beam 7 . 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 radius of the middle ring beam 5 is 1.5-2.5 times the radius of the steel tower 11. The second inner ring beam 7 is arranged outside the first inner ring beam 6, the outer diameter of the first inner ring beam 6 is 0.2m-1m smaller than the inner diameter of the steel tower 11, the width is 0.5-2.5m, and the height is 0.8-1.8m. m. The inner diameter of the second inner ring beam 7 is 0.2m-1m larger than the outer diameter of the steel tower 11, the width is 0.5-2.5m, and the height is 0.8-1.8m.

The top surface of the concrete slab 3 is connected with concrete main beams 8 and concrete secondary beams 9 between the ring beams. The concrete main beam 8 is evenly arranged radially on the top surface of the concrete slab 3 and extends from the second inner ring beam 7 to the outer ring beam 4 . In one embodiment of the present invention, the concrete main beams 8 include six, and the angle between adjacent concrete main beams 8 is 60 degrees; the width of the concrete main beams 8 is 0.5-1.5m, and the height is 0.8-1.8m m. Concrete secondary beams 9 are evenly arranged radially between every two adjacent concrete main beams 8 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 9 include 12-18, and 2-3 concrete secondary beams 9 are arranged between every two adjacent concrete main beams 8, and the axis of the adjacent concrete secondary beams 9 The angle between them is 20-30 degrees.

The upper part of the concrete slab 3 is provided with a concrete transition section 10, the concrete transition section 10 is a linear thin-walled structure with a ring section, and the diameter of the bottom ring is larger than the diameter of the top ring. The concrete transition section 10 is an equal-thickness structure, and its wall thickness is 0.5-1.5m, and prestressed steel strands are distributed in the middle. The annular bottom surface of the concrete transition section 10 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 10 is 20-40m. The concrete transition section 10 of the linear thin-walled structure helps to transfer the upper load to the concrete beam-slab system, and then disperses it to the steel cylinder structure 1 . In addition, the concrete transition section 10 increases the self-weight of the whole structure, so that the whole structure can use the self-weight to resist part of the horizontal load.

A section of steel tower 11 is arranged on the upper part of the concrete transition section 10 , and the steel tower 11 passes through the concrete transition section 10 and directly contacts the concrete slab 3 . The bottom end of the steel tower 11 is inserted between the second inner ring beam 7 and the first inner ring beam 6 .

An elastic buffer device is provided between the steel tower 11 and the top of the concrete transition section 10, between the bottom of the steel tower 11 and the first inner ring beam 6, and between the bottom of the steel tower 11 and the second inner ring beam 7 All are equipped with elastic buffer devices.

As shown in Figure 5, the elastic buffer device is composed of a waterproof layer a, an anti-oxidation layer b, an elastic metal coil c, a first rubber layer d, a rubber raised layer e, and a second rubber layer f which are sequentially bonded by colloid, and the overall thickness It is 0.2-1m, and the height is 0.8-1.8m.

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

(1) The steel cylinder structure 1 is prefabricated on land, and the steel cylinder structure 1 and the steel roof 2 are welded;

(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 first inner ring beam 6, and the second inner ring beam 7 , the concrete main beam 8, the concrete secondary beam 9 and the concrete transition section 10 are poured together;

(3) Lift the overall structure completed by the above-mentioned pouring construction into the water, check the airtightness, install the steel tower tube 11 on the concrete slab 3, between the bottom of the steel tower tube 11 and the first inner ring beam 6, the steel Elastic buffer devices are installed between the bottom of the tower tube 11 and the second inner ring beam 7, between the steel tower tube 11 and the top of the concrete transition section 10, and the machine head is installed on the steel tower tube 11, and adjusted according to the towing requirements. The draft of the steel cylinder structure 1;

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

(5) After the multi-tube combined foundation structure and the aircraft head are floated and towed to the designated sea area, they will first sink under their own weight, and then sink to the designated position under negative pressure;

(6) Reinforce the soil inside the steel cylinder structure 1 after the subsidence is completed.

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 (10)

1. An elastic transition section cylindrical foundation structure, comprising a steel cylinder structure with subdivision structure, characterized in that, the top of the steel cylinder structure is connected with a steel roof, and the top of the steel roof is provided with a concrete slab, the A concrete transition section is arranged on the upper part of the concrete slab, and the concrete transition section is a linear thin-walled structure with a ring section, 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 section of steel tower , the lower part of the steel tower passes through the concrete transition section and is in contact with the concrete slab; The top surface of the concrete slab is provided with an outer ring beam, a middle ring beam, a first inner ring beam, and a second 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 at the The middle part of the top surface of the concrete slab is arranged at the lower part of the concrete transition section; the first inner ring beam is arranged inside the steel tower, and the second inner ring beam is arranged outside the steel tower; The bottom end of the steel tower is inserted between the second inner ring beam and the first inner ring beam; Concrete main beams are uniformly arranged radially on the top surface of the concrete slab, and the concrete main beam extends from the second inner ring beam to the outer ring beam; Concrete secondary beams are evenly arranged radially between the concrete main beams, and the concrete secondary beams extend from the middle ring beam to the outer ring beam; The contact between the steel tower and the top of the concrete transition section is through an elastic buffer device, between the bottom of the steel tower and the first inner ring beam, and between the bottom of the steel tower and the first inner ring beam. The two inner ring beams are in contact with each other through elastic buffer devices. 2. The cylindrical foundation structure of the elastic transition section according to claim 1, wherein the radius of the steel cylinder structure is 10-25m, the height is 5-15m, and the thickness of the cylinder wall is 10-50mm. 3. A cylindrical foundation structure for an elastic transition section according to claim 1, wherein the steel cylinder structure is divided into a plurality of compartments by a subdivision plate, and the plurality of compartments include a middle cabin and a wall surrounding the middle cabin. A plurality of side tanks in the periphery; the wall of the steel cylinder structure and the compartment plate, and the compartment plate and the compartment plate are all connected to each other by welding. 4. A cylindrical foundation structure with an elastic transition section according to claim 1, characterized in that upward steel ribs are provided around the steel roof, and the steel ribs are inserted between the concrete slab and the The outer ring beam. 5. A cylindrical foundation structure of elastic transition section according to claim 1, characterized in that, the steel cylinder structure is consistent with the contours of the concrete slab and the steel roof, and the thickness of the concrete slab is 0.3 -1m. 6. A cylindrical foundation structure with elastic transition section according to claim 1, characterized in that, the concrete transition section is a structure of equal thickness, its wall thickness is 0.5-1.5m, and prestressed steel strands are distributed in the middle . 7. A cylindrical foundation structure with elastic transition section according to claim 1, characterized in that, 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 consistent; the width of the outer ring beam is 0.5-1.5m, and the height is 0.8-1.8m; 0.8-1.8m; the radius of the middle ring beam is 1.5-2.5 times the radius of the steel tower; the outer diameter of the first inner ring beam is smaller than the inner diameter of the steel tower by 0.2m-1m, and the width is 0.5-2.5m, the height is 0.8-1.8m; the inner diameter of the second inner ring beam is 0.2m-1m larger than the outer diameter of the steel tower, the width is 0.5-2.5m, and the height is 0.8-1.8m. 8. A cylindrical foundation structure for an elastic transition section according to claim 1, wherein the concrete main beam has a width of 0.5-1.5m and a height of 0.8-1.8m; the adjacent concrete main beam The angle between them is 60 degrees; the concrete secondary beams include 12-18, and 2-3 concrete secondary beams are arranged between every two adjacent concrete main beams, and the adjacent concrete The included angle between the axes of the secondary beams is 20-30 degrees. 9. A cylindrical foundation structure for an elastic transition section according to claim 1, wherein the elastic buffer device 12 is composed of a waterproof layer a, an anti-oxidation layer b, an elastic metal coil c, a first rubber layer d, The rubber embossed layer e and the second rubber layer f are sequentially composed, with a thickness of 0.2-1m and a height of 0.8-1.8m. 10. A construction method for the elastic transition section cylindrical foundation structure as claimed in claim 1-9, characterized in that, it is carried out according to the following steps: (1) After the steel cylinder structure with subdivision structure is prefabricated on land, the steel cylinder structure and the steel roof are 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, and the first inner ring beam , the second inner ring beam, the concrete main beam, the concrete secondary beam and the concrete transition section are poured together; (3) Hang the overall structure completed by the above-mentioned pouring construction into the water, check the air tightness, install the steel tower on the concrete slab, and connect the bottom of the steel tower with the first inner ring beam. Elastic buffer devices are installed between the bottom of the steel tower and the second inner ring beam, and between the steel tower and the top of the concrete transition section, and on the steel tower Install the nose, adjust the draft of the steel cylinder structure according to the towing requirements; (4) Carrying out floating towage with the cylindrical foundation structure of the elastic transition section and the nose; (5) After the elastic transition section cylindrical foundation structure and the nose are floated and towed to the designated sea area, firstly sink by self-weight, and then sink to the designated position under negative pressure; (6) Reinforcing the soil inside the steel cylinder structure after the sinking is completed.