A suction-type foundation and sinking method

Abstract

The present invention relates to a suction-type foundation and a sinking method, comprising a barrel body, wherein the barrel body is provided with a track extending up and down; a counterweight block, wherein the counterweight block is provided in the barrel body, wherein the counterweight block is a water-permeable counterweight block, and wherein the edge of the counterweight block is provided with a pulley which is slidably connected to the guide of the track; and a water retaining block, wherein the water retaining block is fixedly provided at the bottom of the counterweight block, wherein the water retaining block has a first form for preventing water from passing through and a second form for dissolving in water after being soaked in water for a certain period of time, and a gap for water to pass through is reserved between the edge of the water retaining block and the inner wall of the barrel body, so that when the water retaining block is in the first form, the gap forms a concave opening. The suction-type foundation of the present application is conducive to reducing the sinking resistance on the inner side of the foundation, avoiding the loosening of the soil inside the foundation to form super-high soil plugs and pipe bursts, and preventing the problem of not being able to sink to the designed depth and affecting the service performance of the suction-type foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a suction-type foundation and a sinking method. Background Art

[0002] The suction foundation is a barrel-shaped foundation with an open lower end and a pumping port at the upper end. Under the action of its own weight, it can be inserted into the seabed at a certain depth, forming a closed space inside the foundation. When the pump at the pumping port is started, the water in the foundation is pumped out, forming a negative pressure inside the foundation. The negative pressure causes the suction foundation to be subjected to a downward force, and the effective stress of the soil in contact with the inner wall of the foundation is reduced under the action of the seepage force, resulting in a decrease in the foundation's penetration resistance; thus, the suction foundation can achieve further penetration under the action of negative pressure and eventually sink to the designed depth. However, under the action of seepage, the soil inside the suction foundation in the prior art will loosen, forming an over-high soil plug and pipe bursts, resulting in the inability to sink to the designed depth, affecting the service performance of the suction foundation. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides a suction foundation to solve the technical problem: under the action of seepage, the soil inside the suction foundation in the existing technology will loosen, forming ultra-high soil plugs and pipe bursts, resulting in failure to sink to the designed depth, affecting the service performance of the suction foundation; another purpose of the present invention is to provide a method for sinking a suction foundation.

[0004] The present invention provides a technical solution for a suction foundation, comprising:

[0005] A barrel body, wherein a track extending up and down is provided in the barrel body;

[0006] A counterweight block is disposed in the barrel, the counterweight block is a water-permeable counterweight block, and an edge of the counterweight block is provided with a pulley that is slidably connected to the track guide;

[0007] A water retaining block is fixedly arranged at the bottom of the counterweight block. The water retaining block has a first form for preventing water from passing through and a second form for dissolving in water after being soaked in water for a certain period of time. A gap for water to pass through is reserved between the edge of the water retaining block and the inner wall of the barrel body, so that when the water retaining block is in the first form, the gap forms a protruding opening.

[0008] As a preferred solution, a stopping portion for stopping the pulley is further provided in the barrel body at the lower part of the track.

[0009] As a preferred solution, the track is provided on the inner wall of the barrel, and the stopper is a protrusion integrally formed with the track;

[0010] When the barrel is not inserted into the seabed, the pulley is stopped on the protrusion;

[0011] During the process of inserting the barrel into the seabed, the counterweight block and the water retaining block move upward along the track, so that a concave and convex opening is formed between the water retaining block and the inner wall of the barrel.

[0012] As a preferred solution, the counterweight block includes a plurality of fixed mesh-shaped steel bars and permeable concrete poured on the steel bars.

[0013] As a preferred solution, a horizontally arranged frame is fixedly provided on the edge of the counterweight block, and the pulley is rotatably installed on the edge of the frame.

[0014] As a preferred solution, the material of the water retaining block is polycaprolactone.

[0015] As a preferred solution, a water extraction port is provided on the upper portion of the barrel body.

[0016] As a preferred solution, the distance between the edge of the counterweight block and the inner wall of the barrel body is 0.9 of the diameter of the barrel body.

[0017] A suction-type foundation sinking method comprises the following steps:

[0018] S1, the barrel is inserted under the seabed, so that the soil on the seabed enters the barrel and gradually abuts against the water retaining block, thereby pushing the counterweight block to move upward along the track;

[0019] S2, when the water retaining block is in the first state, the gap between its edge and the inner wall of the barrel forms a protruding concave opening;

[0020] S3, connect the water inlet to the pump, start the pump to create negative pressure in the barrel, and sink the suction foundation to the designed depth;

[0021] S4, after being soaked in water for a certain period of time, the water retaining block dissolves in the water, allowing the water to pass through the counterweight block.

[0022] Compared with the prior art, the beneficial effects of this application are:

[0023] The suction foundation of the present application includes a barrel body, a counterweight block and a water retaining block. A track extending up and down is provided in the barrel body. The counterweight block is arranged in the barrel body. The counterweight block is a permeable counterweight block. The counterweight block is provided with a pulley slidingly connected to the track guide; the water retaining block is fixedly arranged at the bottom of the counterweight block. The water retaining block has a first form for blocking water from passing through and a second form for dissolving in water after being soaked in water for a certain period of time. The first form of the water retaining block can block water when the barrel body is inserted into the seabed. A gap for water to pass through is reserved between the edge of the counterweight block and the inner wall of the barrel body, so that the gap forms a constriction, so that the inner wall of the barrel body generates a larger excess pore water pressure, and the resulting drag reduction effect is better than the suction foundation in the prior art, avoiding the loosening of the soil in the foundation to form ultra-high soil plugs and pipe bursts, and the problem of not being able to sink to the designed depth and affecting the service performance of the suction foundation.

[0024] The suction foundation of the present application prevents the formation of super-high soil plugs and piping under the action of seepage, and counterweights and water retaining blocks are set in the foundation. During negative pressure penetration, the negative pressure generated in the foundation can only cause the fluid to produce seepage at the edge of the water retaining block, forming a sudden contraction in the barrel body, and generating a large excess pore water pressure on the inner wall of the barrel body, resulting in a better drag reduction effect than the traditional suction foundation. Due to the effect of the sudden contraction cross-section, the soil around the inner wall of the barrel body is subjected to an upward seepage force, and the soil around the inner wall of the barrel body is prone to piping, while the soil in the middle of the barrel body is not prone to piping due to a smaller seepage force. Under the action of a smaller negative pressure, penetration to the designed depth can be achieved; with a smaller negative pressure, the volume of piping in the foundation becomes smaller, the loosening of the soil is reduced, and the formation of soil plugs is smaller. The counterweights can also increase the effective stress of the soil, prevent piping from occurring, and reduce the formation of soil plugs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the suction foundation of the present invention.

[0026] Among them, 1. barrel body, 2. track, 3. counterweight, 4. pulley, 5. water retaining block, 6. stopper, 7. steel bar, 8. water outlet. DETAILED DESCRIPTION

[0027] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] A preferred embodiment of a suction-type foundation of the present invention is as follows: Figure 1 As shown, it includes a barrel body 1, a counterweight block 3 and a water retaining block 5. A track 2 extending up and down is provided in the barrel body 1. The counterweight block 3 is arranged in the barrel body 1. The counterweight block 3 is a permeable counterweight block. The counterweight block 3 is provided with a pulley 4 which is slidingly connected to the track 2; the water retaining block 5 is fixedly arranged at the bottom of the counterweight block 3. The water retaining block 5 has a first form for blocking water from passing through and a second form for dissolving in water after being soaked in water for a certain period of time. The first form of the water retaining block 5 can block water when the barrel body 1 is inserted into the seabed. A gap for water to pass through is reserved between the edge of the counterweight block 3 and the inner wall of the barrel body 1, so that the gap forms a constriction, so that the inner wall of the barrel body 1 generates a large excess pore water pressure, and the resulting drag reduction effect is better than the suction foundation in the prior art, avoiding the loosening of the soil in the foundation to form ultra-high soil plugs and pipe bursts, as well as the problem of not being able to sink to the designed depth and affecting the service performance of the suction foundation.

[0029] Specifically, four rails 2 are provided, and four pulleys 4 are provided accordingly.

[0030] Among them, a stopping part 6 for stopping the pulley 4 is also provided in the barrel body 1 at the lower part of the track 2. The stopping part 6 is used to stop the pulley 4, the counterweight block 3 and the water stop block 5 at the position of the track 2 to prevent the pulley 4 from moving into the barrel body 1 at the lower part of the track 2.

[0031] In a specific embodiment of the present application, the track 2 extends up and down and is arranged on the inner wall of the barrel body 1 to provide a guiding function for the track 2, and the stop portion 6 is a protrusion integrally formed with the track 2; when the barrel body 1 is not inserted into the seabed, the pulley 4 is stopped on the protrusion; during the process of the barrel body 1 being inserted into the seabed, the counterweight block 3 and the water block 5 move upward along the track 2 to form a protruding opening between the water block 5 and the inner wall of the barrel body 1.

[0032] In a further embodiment of the present application, the shape of the protrusion is triangular, which is beneficial for reducing penetration resistance.

[0033] In the specific embodiment of the present application, the specific structure of the counterweight block 3 includes a plurality of fixed steel bars 7 in a mesh shape and permeable concrete poured on the steel bars 7. The steel bars 7 are welded and fixedly connected. The permeable concrete is also porous concrete or sandless concrete. It is a porous lightweight concrete made by mixing aggregate, cement, reinforcing agent, and water. It does not contain fine aggregate.

[0034] The specific installation of the pulley 4 in this application is as follows: a horizontally arranged frame is fixed to the edge of the counterweight 3, and the pulley 4 is rotatably mounted on the edge of the frame. The rotation direction of the pulley 4 is up and down, which is the same as the extension direction of the track 2.

[0035] In a specific embodiment of the present application, the material of the water retaining block 5 is polycaprolactone.

[0036] The upper portion of the barrel body 1 is further provided with a water pumping port 8, which is used to connect a pump to provide negative pressure in the barrel body 1 to facilitate sinking.

[0037] In a specific embodiment of the present application, the distance between the edge of the counterweight block 3 and the inner wall of the barrel body 1 is 0.9 times the diameter of the barrel body 1, so as to set a suitable distance on the basis of forming a protruding neck.

[0038] During the negative pressure penetration process, the local resistance loss characteristic of the suddenly constricted pipe is utilized, so that the flow of the fluid is hindered when the cross-section of the barrel body 1 is suddenly constricted, and it does not flow as well as before. Therefore, in order to continue to maintain the original flow rate Q, the upstream pressure in the barrel body 1 needs to be increased. The increased upstream pressure causes the flow of the barrel body 1 to enter a new equilibrium, and the flow rate remains Q. This satisfies the continuity of the fluid, and the negative pressure generated is greater than that generated by a traditional suction barrel body. Therefore, at the same pump speed, a larger negative pressure is generated in the barrel body 1 equipped with a degradable water retaining block 5, which is conducive to penetration.

[0039] In summary, during the penetration process, a constriction is formed in the barrel body 1, which can form a large negative pressure, which is conducive to penetration; increasing the excess pore water pressure on the inner wall of the barrel body 1 can reduce the penetration resistance of the inner wall; the soil around the inner wall of the barrel body 1 forms an upward seepage force, which is easy to form a pipe burst, but the soil in the middle of the barrel body 1 produces a smaller seepage force, which is not easy to cause a pipe burst. The counterweight block 3 can increase the effective stress of the soil in the barrel body 1 to prevent the soil from loosening and forming an ultra-high soil plug and pipe burst. After the penetration is completed, the water retaining block 5 of the degradable material is gradually degraded by seawater, and the constriction in the barrel body 1 disappears, which does not affect the service performance of the barrel body 1.

[0040] The suction barrel 1 of the present application is provided with degradable materials to change the seepage effect of the side wall of the barrel 1, and the inner wall of the barrel 1 generates a large excess pore water pressure, which is beneficial to reducing the penetration resistance. Under the action of a relatively low pump speed, the penetration to the designed depth can be achieved. Due to the effect of the degradable material, the negative pressure is reduced, the volume of the pipe burst in the barrel 1 becomes smaller, the loosening of the soil is reduced, and the formation of the soil plug is smaller. The heavy objects in the barrel 1 can also increase the effective stress of the soil, prevent the occurrence of pipe bursts, and reduce the formation of soil plugs. The counterweight block 3 can reduce the height of the soil plug, increase the effective stress of the soil in the barrel 1, and suppress the occurrence of pipe bursts. After the penetration is completed, the degradable material is immersed in seawater and degraded by the seawater, and the water-retaining effect disappears, which does not affect the service performance of the suction barrel 1 in the later period.

[0041] A suction-type foundation sinking method,

[0042] S1, the barrel 1 is inserted under the seabed, so that the soil on the seabed enters the barrel 1 and gradually abuts against the water retaining block 5, thereby pushing the counterweight block 3 to move upward along the track 2;

[0043] S2, the gap between the edge of the water retaining block 5 and the inner wall of the barrel body 1 forms a protruding opening;

[0044] S3, the water inlet 8 is connected to the pump, and the pump is started to form a negative pressure in the barrel 1, so that the suction foundation is sunk to the designed depth;

[0045] S4, after being soaked in water for a certain period of time, the weight is dissolved in water, and the water passes through the counterweight 3.

[0046] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A suction foundation, characterized in that: include: A barrel body, wherein a track extending up and down is provided in the barrel body; A counterweight block is disposed in the barrel, the counterweight block is a water-permeable counterweight block, and an edge of the counterweight block is provided with a pulley that is slidably connected to the track guide; A water retaining block is fixedly arranged at the bottom of the counterweight block, and the water retaining block has a first form for preventing water from passing through and a second form for dissolving in water after being immersed in water for a certain period of time. A gap for water to pass through is reserved between the edge of the water retaining block and the inner wall of the barrel body, so that when the water retaining block is in the first form, the gap forms a protruding opening; A water extraction port is provided on the upper portion of the barrel body.

2. The suction foundation according to claim 1, characterized in that: A stopping portion for stopping the pulley is also provided in the barrel body at the lower part of the track.

3. The suction foundation according to claim 2, characterized in that: The track is arranged on the inner wall of the barrel, and the stopper is a protrusion integrally formed with the track; When the barrel is not inserted into the seabed, the pulley is stopped on the protrusion; During the process of inserting the barrel into the seabed, the counterweight block and the water retaining block move upward along the track, so that a concave and convex opening is formed between the water retaining block and the inner wall of the barrel.

4. The suction foundation according to claim 1, characterized in that: The counterweight block includes a plurality of fixed mesh-shaped steel bars and permeable concrete poured on the steel bars.

5. The suction foundation according to claim 1, characterized in that: A horizontally arranged frame is fixedly provided on the edge of the counterweight block, and the pulley is rotatably mounted on the edge of the frame.

6. The suction foundation according to claim 1, characterized in that: The material of the water retaining block is polycaprolactone.

7. The suction foundation according to claim 1, characterized in that: The distance between the edge of the counterweight block and the inner wall of the barrel body is 0.9 of the diameter of the barrel body.

8. A method for sinking a suction foundation according to any one of claims 1 to 7, characterized in that: S1, the barrel is inserted under the seabed, so that the soil on the seabed enters the barrel and gradually abuts against the water retaining block, thereby pushing the counterweight block to move upward along the track; S2, when the water retaining block is in the first state, the gap between its edge and the inner wall of the barrel forms a protruding concave opening; S3, connect the water inlet to the pump, start the pump to create negative pressure in the barrel, and sink the suction foundation to the designed depth; S4, after being soaked in water for a certain period of time, the water retaining block dissolves in the water, allowing the water to pass through the counterweight block.

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