Offshore wind power high pile cap foundation with microbial reinforcement function
By using microbial reinforcement technology in the high pile bearing foundation of offshore wind power, cementitious liquid is injected into the soil, the erosion problem of offshore wind power foundation under the combined action of low-intensity soil and wave current is solved, and the effect of improving load-bearing capacity and extending service life is achieved.
Patent Information
- Application Number
- CN202421309279.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-06-11
AI Technical Summary
Under the combined action of low-strength soil and wave current, the high-pile bearing foundation of offshore wind power is prone to erosion of soil particles by water flow, forming local erosion, resulting in reduced bearing capacity of pile foundation and increasing bending moment, stress and lateral deformation.
The offshore wind power high pile bearing foundation with microbial reinforcement function is adopted. By storing cementitious liquid in the construction vessel tank and injecting cementitious liquid into the soil through the conveying pipeline and grouting pipeline, the mechanical properties of sand and soil are enhanced by microbial mineralization reinforcement technology.
It effectively improves the bearing capacity of high pile bearing foundation of sandy soil foundation, reduces the horizontal displacement of pile foundation, extends the service life, and reduces the impact on the environment during construction.
Smart Images
Figure CN222632313U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of civil engineering foundation reinforcement, and specifically relates to an offshore wind power high pile cap foundation with a microbial reinforcement function. Background Art
[0002] The high pile cap type wind turbine foundation structure is a foundation support type commonly used in the development of offshore wind power projects in my country. This type of foundation has a high bearing capacity, a strong ability to resist horizontal loads, a large structural rigidity and a small foundation settlement, and can adapt to various geological conditions. The high pile cap type wind turbine foundation has low requirements for construction equipment and is easy to build and construct.
[0003] Low-strength soil is widely distributed in offshore waters. The combined action of waves and currents causes the flow field near the offshore wind turbine pile foundation to change and form a hydraulic vortex. The above situation causes the soil particles in the local area near the structure to be eroded by the water flow, causing local scouring of the shallow soil of the seabed. The reduction of the bearing capacity of the pile foundation caused by the scouring action leads to a reduction in effective stress and bearing capacity, an increase in the bending moment, stress and lateral deformation of the pile, and the suspension of the submarine cable. Anti-scouring protection measures are used in engineering to avoid surface losses of the seabed. Common measures include riprap protection, sand blanket protection and solidified soil protection. However, riprap protection and sand blanket protection are prone to loss in sea areas with high current velocity, forming secondary scouring. Solidified soil protection is mainly divided into mechanical compaction, chemical grouting and biological reinforcement. Mechanical compaction uses large-scale compaction machinery, which has large energy loss and is easy to cause soil disturbance and affect the soil in the surrounding space. Most of the artificial synthetic materials of chemical grouting are toxic and pose a threat to the natural environment and human health. Microbial reinforcement is a new type of environmentally friendly and cost-effective technology used in foundation treatment to achieve sustainable development.
[0004] Microbial reinforcement technology is to add bacterial liquid, urea and CaCl2 nutrient solution (collectively referred to as cementing solution) into soft soil. Through biochemical reactions, calcium carbonate crystals are generated and deposited. A certain amount of calcite will be generated in the gaps between sand particles, connecting the originally loose sand together, enhancing the mechanical properties and integrity of the sand, and thus playing a role in strengthening the foundation.
[0005] However, there is no corresponding research and report on cementing fluid transportation. Utility Model Content
[0006] The utility model provides an offshore wind power high pile cap foundation with microbial reinforcement function, which can prevent foundation scouring and deformation, and solves the problem of using microbial mineralization reinforcement technology to carry out offshore wind power high pile cap foundation reinforcement project construction.
[0007] The utility model is realized through the following technical solutions.
[0008] The utility model provides an offshore wind power high pile cap foundation with microbial reinforcement function, comprising: a construction ship liquid tank for storing cementing liquid;
[0009] Capping platform: steel pipe piles are provided at the bottom of the capping platform to support the capping platform;
[0010] A delivery pipeline, one end of which is connected to the liquid tank of the construction ship, and the other end of which passes through the cap and is axially laid along the outer wall of the steel pipe pile for delivering the cementing liquid;
[0011] A grouting pipeline is connected to the conveying pipeline and is axially laid along the outer wall of the steel pipe pile and inserted into the soil body, and is used to inject a cementing liquid into the soil body;
[0012] Extension mechanism, through which the expansion of the grouting pipeline is controlled.
[0013] Furthermore, the extension mechanism includes a fixed block, a moving block, a spring, a sliding track and a supporting rod. The fixed block is fixed on the steel pipe pile, and the moving block can slide on the steel pipe pile. The fixed block is on the top and the moving block is on the bottom. The spring is connected between the fixed block and the moving block and is wrapped around the steel pipe pile. The two ends of the sliding track are respectively connected to the fixed block and the grouting pipe, and a slide groove is arranged on the top. The two ends of the supporting rod are respectively connected to the moving block and the sliding track. The supporting rod slides on the sliding track through the slide groove, so that the grouting pipe is unfolded, and the grouting pipe can be retracted and retracted.
[0014] Furthermore, a plurality of steel pipe piles are provided, which are arranged in a circle at equal intervals with the foundation as the center, and each steel pipe pile is provided with at least one conveying pipeline.
[0015] Furthermore, the high pile pedestal foundation includes a grouting hose and a branch connecting component. The liquid tank of the construction ship is connected to the branch connecting component through the grouting hose. The branch connecting component includes a main hose, a circular dispersion bin and a branch hose. The circular dispersion bin is connected to the main hose and the branch hose respectively. The branch hoses are arranged in a ring with equal intervals and are connected to the conveying pipeline one by one. The conveying pipeline includes section A and section B. Section A passes through the pedestal, and section B is fixed on the steel pipe pile. The head end of section A extends out and is detachably connected to the branch hose, and the tail end is connected to the head end of section B, and the tail end of section B is connected to the grouting pipeline.
[0016] Furthermore, a closing cover is provided at the top of section A.
[0017] Furthermore, the grouting hose is wrapped with an asbestos cement shell as a protective layer, and the conveying pipeline and the grouting pipeline are double-layer steel hollow insulation structures.
[0018] Furthermore, the diameters of the grouting hose, the delivery pipe and the grouting pipe are 0.1 m.
[0019] Furthermore, each delivery pipeline is connected to a plurality of grouting pipelines, and the grouting pipelines are surrounded on the steel pipe piles.
[0020] Furthermore, grouting holes are distributed on the grouting pipe, and the binder liquid is injected into the soil through the grouting holes.
[0021] Furthermore, the portion where the grouting pipe is inserted into the soil is a pointed structure.
[0022] The beneficial effects of the utility model are:
[0023] 1. The use of the utility model of offshore wind power high pile cap foundation can effectively improve the bearing capacity of the high pile cap foundation on the sand foundation, reduce the horizontal displacement of the pile foundation, and increase the service life.
[0024] 2. Most of the work of the utility model can be prefabricated on land, the construction method is reliable, suitable for installation and use at the construction site, and easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic diagram of an offshore wind power high pile foundation with microbial reinforcement function according to the utility model;
[0026] Figure 2 This is a vertical cross-sectional view of an offshore wind power high pile foundation with microbial reinforcement function according to the utility model;
[0027] Figure 3 This is a schematic diagram of the extension mechanism structure of the utility model;
[0028] Figure 4 Schematic diagram of branch connection components;
[0029] Figure 5 Schematic diagram of grouting pipeline;
[0030] Figure 6 Schematic diagram of the repaired reinforcement body-pile-cap structure.
[0031] In the figure: abutment 1, steel pipe pile 2, conveying pipeline 3, section A 31, section B 32, extension mechanism 4, fixed block 41, moving block 42, spring 43, sliding track 44, support rod 45, grouting pipeline 5, grouting hole 51, construction ship liquid tank 6, grouting hose 7, branch connecting member 8, main pipe 81, circular dispersion bin 82, branch pipe 83, closing cover 311, fixed member 321, transition member 9, reinforcement body 10. DETAILED DESCRIPTION
[0032] The following is a further description of the structures involved in the present invention or the technical terms used. These descriptions are merely examples of how the present invention is implemented and do not constitute any limitation to the present invention.
[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left" and "right" indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0034] In the description of the present invention, unless otherwise clearly specified and limited, "connection", "fixation" and the like should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0035] The utility model provides an offshore wind power high pile foundation with microbial reinforcement function, such as Figure 1-6 As shown, it includes a construction ship liquid tank 6 for storing cementing liquid; a cap 1, a steel pipe pile 2 is provided at the bottom of the cap 1 for supporting the cap 1; a conveying pipeline 3, one end of the conveying pipeline 3 is connected with the construction ship liquid tank 6, and the other end passes through the cap 1 and is axially laid along the outer wall of the steel pipe pile 2, so as to convey the cementing liquid; a grouting pipeline 5, the grouting pipeline 5 is connected with the conveying pipeline 3 and is axially laid along the outer wall of the steel pipe pile 2 and inserted into the soil, so as to inject the cementing liquid into the soil; an extension mechanism 4, the extension mechanism 4 is used to control the expansion of the grouting pipeline 5.
[0036] The grouting pipe 5 is controlled to be unfolded by the extension mechanism 4. Before grouting, the grouting pipes 5 are controlled to be unfolded in an umbrella shape and extended in the vertical direction by the extension mechanism 4 and inserted into the soil. The cementing liquid is transported through the delivery pipe 3 and then injected into the soil through the grouting pipe 5, which effectively improves the bearing capacity of the high pile foundation of the sand foundation, reduces the horizontal displacement of the pile foundation, and increases the service life.
[0037] As an optional embodiment, a plurality of steel pipe piles 2 are provided, which are arranged in a ring at equal intervals with the base 1 as the center, and each steel pipe pile 2 is provided with at least one conveying pipeline 3.
[0038] Specifically, six steel pipe piles 2 are provided, and a delivery pipeline 3 is provided on each steel pipe pile 2. A delivery pipeline 3 is provided on each steel pipe pile 2. The six steel pipe piles 2 ensure that the foundation structure of the cap is stable and firm. Of course, the number of steel pipe piles 2 is not limited to the above, such as three, four, eight, or more. A delivery pipeline 3 is provided on each steel pipe pile 2 to ensure that the soil around the cap foundation is injected with cementing liquid.
[0039] As an optional embodiment, the foundation 1 is made of concrete and has a thickness of 4 meters.
[0040] As an optional embodiment, the high pile cap foundation includes a grouting hose 7 and a branch connection member 8. The construction ship liquid tank 6 is connected to the branch connection member 8 through the grouting hose 7. The branch connection member 8 includes a main hose 81, a circular dispersion bin 82 and a branch hose 83. The circular dispersion bin 82 is connected to the main hose 81 and the branch hose 83 respectively. The branch hoses 83 are arranged in an annular manner with equal spacing. The branch hoses 83 are connected one by one with the delivery pipeline 3. The delivery pipeline 3 includes a section A 31 and a section B 32. The section A 31 passes through the cap 1, and the section B 32 is fixed on the outer wall of the steel pipe pile 2. The head end of the section A 31 extends out and is detachably connected to the branch hose 83, and the tail end is connected to the head end of the section B 32. The tail end of the section B 32 is connected to the grouting pipeline 5. The cementing liquid is stored in the liquid tank of the construction ship 6. During the grouting construction, the grouting hose is connected to the construction ship liquid tank 6 to pump out the cementing liquid and inject it into the soil through the delivery pipeline 3 and the grouting pipeline 5. In order to control the temperature of the cementing solution, the cementing liquid is stored in a liquid tank, which should be equipped with a heating switch and a temperature display device to ensure that the activity of the cementing liquid is kept in a good state during grouting. The cementing liquid in the liquid tank 6 of the construction ship can be evenly injected into the delivery pipeline 3 through the branch connection component 7, and then evenly injected into the soil around the high pile foundation to ensure that the mechanical properties of the soil are consistent. The interface of the grouting hose 7 and the branch hose 83 is set as a steel threaded interface for easy disassembly.
[0041] As an optional embodiment, a closing cover 311 is provided at the top of section A 31 . When not in use, the grouting hose 7 is removed from section A 31 , and then the pipe opening of section A is covered with the closing cover 311 to prevent impurities from entering the conveying pipeline 3 .
[0042] As an optional embodiment, the B section 32 is fixed to the steel pipe pile 2 by a fixing member 321 , and a fixing member 321 is provided every 2 meters to prevent the conveying pipeline 3 from falling.
[0043] Specifically, the fixing member 321 is a stainless steel solid metal ring, which is welded on the steel pipe pile 2, and the conveying pipeline 3 passes through the metal ring to play a fixing role.
[0044] As an optional embodiment, each delivery pipeline 3 is connected to a plurality of grouting pipelines 5 , and the grouting pipelines 5 are equally spaced around the steel pipe piles 2 .
[0045] Specifically, the grouting pipe 5 is connected to the tail end of the B section 32 through the adapter member 9, and the adapter member 9 is annularly fixed on the steel pipe pile 2. A plurality of grouting pipes 5 are connected to the adapter member 9 and surrounded on the steel pipe pile 2. The position of the grouting pipe 5 on the steel pipe pile 2 is determined according to the specific situation.
[0046] Specifically, the transition component 9 is an annular stainless steel metal ring with a hollow structure. There is a hole on the top of the stainless tube ring, which is connected to the grouting pipe 5, and there are several holes on the bottom, which are connected to the tail end of section B 32 to form a liquid transportation passage.
[0047] As an optional embodiment, the grouting pipe 5 is provided with grouting holes 51, and the cementing liquid is injected into the soil through the grouting holes 51. Specifically, the grouting holes 51 are distributed on the wall of the entire grouting pipe 5, and the number, shape, size, etc. are determined according to specific requirements.
[0048] As an optional embodiment, the portion where the grouting pipe 5 is inserted into the soil body is a pointed structure, which can make the grouting pipe better embedded in the soil layer.
[0049] As an optional embodiment, the grouting hose 7 is wrapped with an asbestos cement shell as a protective layer, and the delivery pipeline 3 and the grouting pipeline 5 are double-layer steel hollow insulation structures, which can insulate the pipelines.
[0050] As an optional embodiment, the diameters of the grouting hose 7, the delivery pipeline 3 and the grouting pipeline 5 are 0.1 m. Of course, the diameters are not necessarily all 0.1 m, and the pipe diameters of the pipes are consistent for easy connection.
[0051] As an optional embodiment, the extension mechanism 4 includes a fixed block 41, a moving block 42, a spring 43, a sliding track 44 and a support rod 45. The fixed block 41 is fixed on the steel pipe pile 2, and the moving block 42 can slide on the steel pipe pile 2. The fixed block 41 is on the top and the moving block 42 is on the bottom. The spring 43 is connected between the fixed block 41 and the moving block 42 and is wound around the steel pipe pile 2. The two ends of the sliding track 44 are respectively connected to the fixed block 41 and the grouting pipe 5, and a sliding groove is arranged on the upper surface. The two ends of the support rod 45 are respectively connected to the moving block 42 and the sliding track 44. The support rod 45 slides on the sliding track 44 through the sliding groove to expand the grouting pipe 5. The grouting pipe 5 is a telescopic rod to expand and contract the grouting pipe 5. Initially, the spring 43 is in a compressed state. When it is expanded, the spring 43 is quickly released to accelerate its extension speed. By its own weight, the end of the grouting pipe 5 is inserted into the soil.
[0052] Among them, the grouting pipe 5 can be an automatic telescopic rod connected by multiple pipe sections, which belongs to the prior art and will not be described in detail here.
[0053] Before grouting, the extension mechanism 4 controls the multiple grouting pipes 5 to be expanded like an umbrella and inserted into the soil. Figure 2 As shown, the leftmost steel pipe pile is in the expanded state of the grouting pipe 5. The expansion range is set according to the foundation reinforcement design. When recovering, the multiple grouting pipes 5 are controlled to close by the extension mechanism 4.
[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. An offshore wind power high pile foundation with microbial reinforcement function, characterized in that: include: The construction vessel's liquid tank is used to store cementing liquid; Capping platform: steel pipe piles are provided at the bottom of the capping platform to support the capping platform; A delivery pipeline, one end of which is connected to the liquid tank of the construction ship, and the other end of which passes through the cap and is axially laid along the outer wall of the steel pipe pile for delivering the cementing liquid; A grouting pipeline is connected to the conveying pipeline and is axially laid along the outer wall of the steel pipe pile and inserted into the soil body, and is used to inject a cementing liquid into the soil body; Extension mechanism, through which the expansion of the grouting pipeline is controlled.
2. The offshore wind power high pile foundation with microbial reinforcement function according to claim 1 is characterized by: The extension mechanism includes a fixed block, a moving block, a spring, a sliding track and a supporting rod. The fixed block is fixed on the steel pipe pile, and the moving block can slide on the steel pipe pile. The fixed block is on the top and the moving block is on the bottom. The spring is connected between the fixed block and the moving block and is wound around the steel pipe pile. The two ends of the sliding track are respectively connected to the fixed block and the grouting pipe, and a slide groove is arranged on the top. The two ends of the supporting rod are respectively connected to the moving block and the sliding track. The supporting rod slides on the sliding track through the slide groove, so that the grouting pipe is unfolded, and the grouting pipe can be retracted and retracted.
3. The offshore wind power high pile foundation with microbial reinforcement function according to claim 1 is characterized by: A plurality of steel pipe piles are provided, which are arranged in a circle at equal intervals with the foundation as the center, and each steel pipe pile is provided with at least one conveying pipeline.
4. The offshore wind power high pile foundation with microbial reinforcement function according to claim 1, characterized in that: The high pile cap foundation includes a grouting hose and a branch connecting component. The liquid tank of the construction ship is connected to the branch connecting component through the grouting hose. The branch connecting component includes a main hose, a circular dispersion bin and a branch hose. The circular dispersion bin is connected to the main hose and the branch hose respectively. The branch hoses are arranged in a ring with equal intervals and are connected to the conveying pipeline one by one. The conveying pipeline includes section A and section B. Section A passes through the cap, and section B is fixed on the steel pipe pile. The head end of section A extends out and is detachably connected to the branch hose, and the tail end is connected to the head end of section B, and the tail end of section B is connected to the grouting pipeline.
5. The offshore wind power high pile foundation with microbial reinforcement function according to claim 4 is characterized by: A closing cover is provided at the top of section A.
6. The offshore wind power high pile foundation with microbial reinforcement function according to claim 4, characterized in that: The grouting hose is wrapped with an asbestos cement shell as a protective layer, and the delivery pipe and grouting pipe are double-layer steel hollow insulation structures.
7. The offshore wind power high pile foundation with microbial reinforcement function according to claim 6, characterized in that: The diameter of the grouting hose, delivery pipe and grouting pipe is 0.1m.
8. The offshore wind power high pile foundation with microbial reinforcement function according to claim 1, characterized in that: Each delivery pipeline is connected to a plurality of grouting pipelines, and the grouting pipelines are surrounded on the steel pipe piles.
9. The offshore wind power high pile foundation with microbial reinforcement function according to claim 1, characterized in that: Grouting holes are distributed on the grouting pipe, and the binder is injected into the soil through the grouting holes.
10. The offshore wind power high pile foundation with microbial reinforcement function according to claim 1, characterized in that: The part where the grouting pipe is inserted into the soil is a pointed structure.