CN114750879A - Underwater transfer method for large-size precast concrete cushion block structure in flexible connection mode - Google Patents
Underwater transfer method for large-size precast concrete cushion block structure in flexible connection mode Download PDFInfo
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- CN114750879A CN114750879A CN202210267244.0A CN202210267244A CN114750879A CN 114750879 A CN114750879 A CN 114750879A CN 202210267244 A CN202210267244 A CN 202210267244A CN 114750879 A CN114750879 A CN 114750879A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B77/00—Transporting or installing offshore structures on site using buoyancy forces, e.g. using semi-submersible barges, ballasting the structure or transporting of oil-and-gas platforms
- B63B77/10—Transporting or installing offshore structures on site using buoyancy forces, e.g. using semi-submersible barges, ballasting the structure or transporting of oil-and-gas platforms specially adapted for electric power plants, e.g. wind turbines or tidal turbine generators
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Abstract
A large-size precast concrete cushion block structure underwater transfer method adopting a flexible connection mode comprises a precast platform and a plurality of buoyancy tanks, wherein firstly, cushion blocks and the buoyancy tanks are built on the precast platform, the buoyancy tanks are respectively connected with cushion block embedded hoisting points and buoyancy tank lifting lugs and cushion block embedded hoisting points through vertical cables and diagonal cables, and every two buoyancy tanks are connected through horizontal cables; filling water into the prefabricated platform and sinking, floating the cushion block and the buoyancy tank integrally and drawing the cushion block and the buoyancy tank to a specified position, filling water into the buoyancy tank, and sinking the cushion block and the buoyancy tank integrally until the bottom of the buoyancy tank is seated; and (4) unwinding the cables between the buoyancy tanks and the cushion blocks, and independently transferring the buoyancy tanks to the prefabricated platform area for transferring the next cushion block. The floating box realizes the integral floating and sinking of the cushion block and the floating box by utilizing the water filling and draining functions of the floating box, and the floating box can be repeatedly used; the flexible connection system formed by the vertical cable, the inclined pull cable and the horizontal cable can improve the overall stability of the structure and can not damage the main structure due to too large constraint rigidity.
Description
Technical Field
The invention relates to the technical field of offshore wind power, in particular to a method for transferring a concrete cushion block structure prefabricated at a near-shore base of a cylindrical foundation in water through flexible connection.
Background
With the continuous development of offshore wind power offshore resources, offshore wind power is continuously developed to the deep open sea. Compared with the traditional foundation, the cylindrical foundation has more remarkable capability of resisting environmental load under the same material consumption. In order to further reduce the construction and installation cost of offshore wind power, the construction and installation of the cylindrical foundation are gradually changed from land prefabrication and hoisting launching into underwater prefabrication. In order to bear the vertical load of the foundation and prevent the foundation from being buried into the seabed in the construction process, a large-size cushion block structure needs to be arranged at the bottom of the foundation. However, due to the size and weight, the safety transfer of the large-sized precast concrete pad structure in water is an urgent problem to be solved.
The invention aims to provide a method for transferring a large-size precast concrete cushion block structure in water by adopting a flexible connection mode.
The technical scheme adopted by the invention is as follows:
a method for transferring large-size precast concrete cushion block structures in water is characterized by comprising the following steps: the device comprises a prefabricated platform, a bearing cushion block, a plurality of floating boxes and a lifting device, wherein the prefabricated platform is used for bearing the cushion block and comprises a plurality of floating boxes for floating the cushion block; the method comprises the following steps:
1) floating the prefabricated platform on the water surface, building the cushion blocks and the buoyancy tanks on the prefabricated platform, lofting in advance, and placing the buoyancy tanks according to the design positions of the buoyancy tanks on the cushion blocks;
2) welding a ground order and lifting lug stress structure when the cushion block floats and transfers corresponding to the strong structure position in the buoyancy tank;
3) the vertical cable and the diagonal cable are respectively connected with the cushion block embedded hoisting point and the lifting lug and the cushion block embedded hoisting point, and every two buoyancy tanks are connected through the horizontal cable, so that the buoyancy tanks are mutually restricted when moving in water, and the integral stability is improved;
4) the prefabricated platform is filled with water and sinks, the gravity of the cushion block and the whole buoyancy tank is greater than the buoyancy at the initial stage, the cushion block and the buoyancy tank sink together with the prefabricated platform, the draft height outside the buoyancy tank is increased along with the increase of the sinking depth, the buoyancy of the cushion block and the whole buoyancy tank is greater than the gravity, and the whole body floats and is separated from the prefabricated platform;
5) pulling the cushion block through an external traction device to enable the buoyancy tank and the cushion block to move horizontally and leave the prefabricated platform area;
6) after the cushion block moves to a specified position, filling water into the buoyancy tank, and continuously sinking the cushion block and the buoyancy tank together until the cushion block is seated along with the increase of the water filling amount in the buoyancy tank;
7) and (4) unwinding a cable between the buoyancy tank and the cushion block, wherein the buoyancy tank has self-floating stability and is independently transferred to the prefabricated platform area to transfer the next cushion block.
Furthermore, the buoyancy of the prefabricated platform before water filling is larger than the gravity of the cushion block and the buoyancy tank, and the prefabricated platform sinks and is separated from the cushion block and the buoyancy tank after water filling.
Furthermore, the buoyancy of the buoyancy tank before water filling is larger than the gravity of the cushion block, and after the buoyancy tank is dragged by external force to reach a preset position, the buoyancy tank and the cushion block sink together after water filling.
Further, the ground joint in the step 2) is welded at a strong structural position on the side surface of the buoyancy tank.
Further, step 2) lug 8 weld in the strong structure position in flotation tank top, link to each other with the pre-buried hoisting point of cushion through drawing the hawser to one side, prevent that the flotation tank from producing great inclination in aqueous.
Further, the horizontal cable in the step 3) is connected with the horizontal lifting hook between the two adjacent buoyancy tanks, so that the buoyancy tanks are constrained from each other to move, the stability of the whole structure in water is improved, and the buoyancy tanks are constrained from each other to move.
The invention has the beneficial effects that:
the underwater transfer method of the large-size precast concrete cushion block structure by adopting the flexible connection mode can realize the transfer of the large-size precast concrete panel structure in water and can be repeatedly used; the floating and sinking of the cushion block and the floating box are realized by utilizing the water filling and draining functions of the floating box, and the floating box can be repeatedly used; the flexible connection system formed by the vertical cable, the inclined pull cable and the horizontal cable can improve the overall stability of the structure and can not damage the main structure due to too large constraint rigidity.
Drawings
FIG. 1 is an isometric view of an underwater transfer method for a large-sized precast concrete pad structure using a flexible connection according to the present invention;
FIG. 2 is a partial view of a vertical cable connection for an underwater transfer method of a large-sized precast concrete pad structure using a flexible connection according to the present invention;
FIG. 3 is a partial view of horizontal cable connection for an underwater transfer method of a large-sized precast concrete pad structure using a flexible connection according to the present invention;
FIG. 4 is a layout diagram of lifting lugs and horizontal lifting hooks at the top of a buoyancy tank for the underwater transfer method of the large-size precast concrete cushion block structure in a flexible connection mode;
FIG. 5 shows that the cushion block and the buoyancy tank are floated integrally by the method for transferring the large-size precast concrete cushion block structure in water in a flexible connection mode;
FIG. 6 is a diagram showing the connection between the buoyancy tank and the cushion block in the water transfer method of the large-size precast concrete cushion block structure using the flexible connection method according to the present invention;
FIG. 7 is a schematic diagram of a cushion block transferring-out prefabrication platform of the underwater transferring method of the large-size precast concrete cushion block structure adopting a flexible connection mode;
FIG. 8 illustrates a foundation transfer method of the underwater transfer method for a large-sized precast concrete pad structure using a flexible connection manner to a pad according to the present invention;
in figure 1, a platform is prefabricated; 2. a buoyancy tank; 3. cushion blocks; 4. a step of ordering; 5. a vertical cable; 6. a horizontal cable; 7. a horizontal hook; 8. lifting lugs; 9. embedding lifting points in the cushion blocks; 10. cable-stayed cables; 11. a cylindrical foundation.
Detailed Description
The invention provides an underwater transfer method for a large-size precast concrete cushion block structure, which is used for transferring the large-size precast concrete cushion block structure in water.
Referring to attached drawings 1-8, the invention discloses a large-size precast concrete cushion block structure underwater transfer device and a method, which adopt a flexible connection mode and mainly comprise a precast platform 1, a buoyancy tank 2, a cushion block 3, a ground rope 4, a vertical cable rope 5, a horizontal cable rope 6, a horizontal lifting hook 7, a lifting lug 8, a cushion block embedded lifting point 9 and a cable-stayed cable rope 10. The buoyancy tank 2 is a floating device of the cushion block 3, and the self design size is adjusted according to the size of the cushion block 3 and the depth of the sea water; the cushion block 3 is a bearing structure of an upper foundation, and the size is designed according to the bearing capacity of the foundation; the ground 4 is welded at a strong structure position on the side surface of the buoyancy tank 2 and mainly provides a vertical upward force for the cushion block 3; the vertical cable 5 is a high-strength cable, the diameter of the vertical cable is selected according to the required breaking force, and the vertical cable 4 is connected with the cushion block pre-embedded lifting point 9 on the cushion block 3; the horizontal cable 6 is connected with a horizontal lifting hook 7 between two adjacent buoyancy tanks 2, so that the buoyancy tanks 2 are constrained to move mutually, and the stability of the whole structure in water is improved; the horizontal lifting hooks 7 are provided with a plurality of lifting hooks and are longitudinally and uniformly distributed on two sides of the buoyancy tank 2; the lug 8 welds in 2 top strong structural positions of flotation tank, links to each other with the pre-buried hoisting point 9 of cushion through drawing hawser 10 to one side, prevents that flotation tank 2 from producing great inclination in aqueous.
The invention is characterized in that a prefabricated platform 1 and a buoyancy tank 2 are provided with water filling and draining devices which are respectively arranged in a cabin of the prefabricated platform 1 and a cabin of the buoyancy tank 2. A water charging and discharging pipeline system is arranged in the prefabricated platform 1, a water pump is arranged in the dry cabin, and a water pump start-stop control line is introduced into an above-water control chamber for control; the buoyancy tank 2 is filled with water and pumped into through the centrifugal pump on water, the drainage is pumped out through the submersible pump inside the buoyancy tank 2, and the submersible pump is started and stopped to control the control line and is introduced into the control chamber on water to control. The water filling and draining device aims to realize sinking and floating of the prefabricated platform 1 and the buoyancy tank 2 through water filling and draining so as to realize the underwater transfer operation of the invention.
The transfer method comprises the following steps:
when the prefabricated platform 1 floats on the water surface, the cushion blocks 3 and the buoyancy tanks 2 are built on the prefabricated platform 1, lofting is carried out in advance, and the prefabricated platform is placed according to the design positions of the buoyancy tanks 2 on the cushion blocks 3;
stress structures such as a ground 4 order, a lifting lug 8 and the like are welded when the cushion block 3 floats and transfers corresponding to the position of the strong structure in the buoyancy tank 2;
referring to the attached drawings 3-5, a vertical cable 5 and a diagonal cable 10 are respectively connected with a cushion block pre-embedded lifting point 9, a lifting lug 8 and the cushion block pre-embedded lifting point 9, and the cable is tensioned in advance through a chain block, so that the cable is prevented from generating large deformation due to lifting stress; the two buoyancy tanks 2 are connected through a horizontal cable 6, so that the buoyancy tanks 2 are restricted when moving in water, and the overall stability is improved;
the prefabricated platform 1 is filled with water and sinks, and the gravity of the cushion block 3 and the buoyancy tank 2 is larger than the buoyancy force at the initial stage, so that the prefabricated platform 1 sinks together. With the increase of the sinking depth, the draft height outside the buoyancy tank 2 is increased, the buoyancy of the cushion block 3 and the buoyancy tank 1 is larger than the gravity, and the whole buoyancy tank floats and is separated from the prefabricated platform 1;
referring to fig. 7, the cushion block 3 is pulled by an external traction device, so that the buoyancy tank 2 and the cushion block 3 move horizontally and leave the prefabricated platform area;
after the cushion block 3 moves to a specified position, water is filled into the buoyancy tank 2, and the cushion block 3 and the buoyancy tank 2 are integrally sunk continuously along with the increase of the water filling amount in the buoyancy tank until the bottom of the water-saving water closet bowl is seated;
and (3) unwinding the cable between the buoyancy tank 2 and the cushion block 3, wherein the buoyancy tank 2 has self-floating stability and can be independently transferred to the prefabricated platform area for transferring the next cushion block.
In the embodiment of the invention, the cushion block 3 is of a hexagonal panel structure, the size of opposite sides is 39m, and the thickness is 30 cm; the width of the buoyancy tank 2 is 2.5m, the height thereof is 12m, and the length thereof is 15 m; 4 nominal tension of the ground ream 50 t; the vertical cable 5 and the diagonal cable 10 are high-strength cables with the diameter of 28mm, and the horizontal cable 6 is a common nylon cable with the diameter of 28 mm; the lifting lug 8 is designed according to the pulling force of 60 t; the cushion block embedded lifting points 9 are designed to bear 50 t. Referring to fig. 8, after the spacer 3 is moved to the predetermined position, the cylindrical foundation 11 can be moved to the spacer 3 for the next fixing operation. In this embodiment, the prefabricated hexagonal cylindrical foundation 11 has a diameter of 32 m.
Claims (6)
1. A method for transferring large-size precast concrete cushion block structures in water by adopting a flexible connection mode is characterized by comprising the following steps: the device comprises a prefabricated platform (1), a bearing cushion block (3), a plurality of buoyancy tanks (2) and a plurality of lifting mechanisms, wherein the buoyancy tanks are used for lifting the cushion block (3); the method comprises the following steps:
1) floating the prefabricated platform (1) on the water surface, building the cushion blocks (3) and the buoyancy tanks (2) on the prefabricated platform (1), lofting in advance, and placing according to the design positions of the buoyancy tanks (2) on the cushion blocks (3);
2) corresponding to the position of a strong structure in the buoyancy tank (2), a stress structure of the ground ream (4) and the lifting lug (8) is welded when the cushion block (3) floats and transfers;
3) the vertical mooring rope (5) and the diagonal mooring rope (10) are respectively connected with the cushion block embedded lifting point (9) and the lifting lug (8) and the cushion block embedded lifting point (9), and every two buoyancy tanks (2) are connected through the horizontal mooring rope (6), so that the buoyancy tanks (2) are mutually restricted during movement in water, and the integral stability is improved;
4) the prefabricated platform (1) is filled with water and sinks, the gravity of the whole cushion block (3) and the buoyancy tank (2) at the initial stage is greater than the buoyancy, the prefabricated platform (1) sinks together, the outside draft height of the buoyancy tank (2) is increased along with the increase of the sinking depth, the buoyancy of the whole cushion block (3) and the buoyancy tank (2) is greater than the gravity, and the whole prefabricated platform (1) floats and is separated from the buoyancy tank;
5) pulling the cushion block (3) through an external traction device to enable the buoyancy tank (2) and the cushion block (3) to move horizontally and leave the prefabricated platform area;
6) after the cushion block (3) moves to the designated position, water is filled into the buoyancy tank (2), and the cushion block (3) and the buoyancy tank (2) integrally sink continuously along with the increase of the water filling amount in the buoyancy tank until the bottom of the buoyancy tank is seated;
7) and (3) unwinding the cable between the buoyancy tank (2) and the cushion block (3), wherein the buoyancy tank (2) has self-floating stability and is separately transferred to the prefabricated platform area for transferring the next cushion block.
2. The underwater transfer method of a large-sized precast concrete cushion structure using a flexible coupling manner as claimed in claim 1, wherein: the buoyancy of the prefabricated platform (1) before water filling is larger than the gravity of the cushion block (3) and the buoyancy tank (2), and the prefabricated platform (1) sinks and is separated from the cushion block (3) and the buoyancy tank (2) after water filling.
3. The underwater transfer method of a large-sized precast concrete cushion structure using a flexible coupling manner as claimed in claim 1, wherein: the buoyancy of the buoyancy tank (2) before water filling is larger than the gravity of the cushion block (3), and after the buoyancy tank (2) is dragged by external force to reach a preset position, the buoyancy tank and the cushion block sink together after water filling.
4. The underwater transfer method of a large-sized precast concrete cushion structure using a flexible coupling manner as claimed in claim 1, wherein: and 2) welding the ground ream (4) at a strong structure position on the side surface of the buoyancy tank (2).
5. The underwater transfer method of a large-sized precast concrete cushion structure using a flexible coupling manner as claimed in claim 1, wherein: and 2), the lifting lugs (8) are welded at the strong structure position at the top of the buoyancy tank (2) and are connected with the cushion block embedded lifting points (9) through cable-stayed cables (10), so that the buoyancy tank (2) is prevented from generating a large inclination angle in water.
6. The underwater transfer method of a large-sized precast concrete cushion structure using a flexible coupling manner as claimed in claim 1, wherein: and 3) connecting the horizontal cable (6) with the horizontal lifting hook (7) between the two adjacent buoyancy tanks (2), so that the buoyancy tanks (2) are constrained from each other to displace, the stability of the whole structure in water is improved, and the buoyancy tanks are constrained from each other to displace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210267244.0A CN114750879A (en) | 2022-03-18 | 2022-03-18 | Underwater transfer method for large-size precast concrete cushion block structure in flexible connection mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210267244.0A CN114750879A (en) | 2022-03-18 | 2022-03-18 | Underwater transfer method for large-size precast concrete cushion block structure in flexible connection mode |
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| Publication Number | Publication Date |
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| CN114750879A true CN114750879A (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210267244.0A Pending CN114750879A (en) | 2022-03-18 | 2022-03-18 | Underwater transfer method for large-size precast concrete cushion block structure in flexible connection mode |
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| CN (1) | CN114750879A (en) |
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- 2022-03-18 CN CN202210267244.0A patent/CN114750879A/en active Pending
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