A solidified material for scour prevention of an offshore wind pile foundation and a preparation process, application and construction method thereof

Abstract

The application discloses a kind of solidified material for scour prevention of offshore wind power pile foundation and its preparation process, application and construction method, it is related to marine engineering material technical field, solidified material is by weight parts, including: seabed silt or land soil 600~700 parts, curing agent 200~350 parts, water-retaining agent 3~6 parts, waterproof plugging agent 1~5 parts, auxiliary cementing material 10~50 parts, defoaming agent 1~3 parts, early strength agent 1~4 parts, color filler 0~5 parts, water reducing agent 0~3 parts, water 800~900 parts.The solidified material of the application has excellent performance, low cost;Preparation process is simple, can be carried out on construction ship all the time, is more friendly to environment, is suitable for popularization and dissemination in offshore wind power pile foundation reinforcement field.

Description

Technical Field

[0001] This invention relates to the field of marine engineering materials technology, and in particular to a solidification material for scour prevention of offshore wind turbine pile foundations, its preparation process, application and construction method. Background Technology

[0002] Offshore wind power is a renewable energy generation method that utilizes offshore wind resources by constructing wind turbine generators in the ocean. Offshore wind power has several advantages over onshore wind power. First, it can take advantage of the stronger and more stable wind resources of the ocean, increasing the power generation capacity of the wind turbine generators. Second, it avoids land resource constraints, allowing construction in areas far from residential areas and protected landscapes, reducing potential environmental and population impacts. Furthermore, offshore wind power has lower noise and visual impact compared to onshore wind power.

[0003] However, offshore wind power also faces some challenges and limitations. On the one hand, the construction and operation and maintenance costs of offshore projects are high, and the pile foundations are easily eroded and damaged under complex marine environments and conditions such as wind and waves. On the other hand, the operation and maintenance process of offshore wind power pile foundations is also extremely difficult, requiring consideration of the impact of natural factors such as waves, currents, and tides on construction.

[0004] Currently, the main anti-scouring protection measures for offshore wind turbine pile foundations are as follows: ① Rock throwing: using gabions or directly throwing stones onto the pile foundation to resist the impact of water flow; ② Sandbags: using sandbags to reinforce the pile foundation or building wave-breaking walls around the pile foundation to structurally block waves and water flow, thereby protecting the pile foundation from scouring; ③ Concrete interlocking barriers: constructing concrete interlocking barriers on the seabed to block the impact of water flow.

[0005] While the above measures can protect the pile foundation to some extent, their drawbacks are also obvious: ① Rock placement requires sophisticated techniques and is inefficient; the size and gradation of the rocks significantly affect the protective effect, and the process can easily cause secondary damage to the pile foundation. ② The geotextiles of sandbags are easily damaged, and sand and gravel leakage affects construction quality; moreover, it is difficult for sandbags to maintain complete contact with the pile foundation in the sea. ③ The sealing at the edges or gaps of the concrete interlocking piles is poor, easily causing erosion of the lower layer and affecting the protective effect; as a rigid material, concrete is prone to causing secondary damage to the pile foundation. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a solidification material for scour prevention of offshore wind power pile foundations, its preparation process, application, and construction method.

[0007] To address the shortcomings of existing pile foundation protection measures, the present invention aims to provide a curing material for scour prevention of offshore wind power pile foundations, along with its preparation process, application, and construction method. Firstly, this curing material is inexpensive and exhibits excellent water dispersion resistance and strong pumpability during construction. After curing, it possesses excellent macroscopic mechanical properties, resistance to water scour, and resistance to ion erosion. Secondly, the accompanying preparation process is simple, environmentally friendly, and mechanized production significantly reduces the risks associated with manual construction. It allows for on-site preparation and use, ensuring material freshness and guaranteeing construction quality and material reinforcement effectiveness.

[0008] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a solidification material for erosion prevention of offshore wind power pile foundations, comprising, by weight: 600-700 parts of seabed silt or terrestrial soil, 200-350 parts of solidifying agent, 3-6 parts of water-retaining agent, 1-5 parts of waterproofing and leak-stopping agent, 10-50 parts of auxiliary cementitious material, 1-3 parts of defoamer, 1-4 parts of early strength agent, 0-5 parts of pigments and fillers, 0-3 parts of water-reducing agent, and 800-900 parts of water;

[0010] The curing agent is preferably ordinary silicate cement or phosphate cement, and its function is to bond and cure.

[0011] The water-retaining agent is mainly composed of one or more of polyacrylamide, hydroxypropyl methylcellulose, sodium polyacrylate, starch-grafted acrylate and polyacrylol, used in combination. Its function is to make the slurry have a certain resistance to water dispersion and maintain a good aggregated state in water without being washed away by water.

[0012] Preferably, the polyacrylamide composition is: 71% acrylamide, 21% potassium acrylate, 7.4% water, and 0.6% crosslinking agent;

[0013] Preferably, the hydroxypropyl methylcellulose has a viscosity of 100,000 and a purity of ≥95%.

[0014] Preferably, the sodium polyacrylate is a powdered sodium polyacrylate polymerized by emulsion polymerization;

[0015] Preferably, the starch-grafted acrylate composition is: 22% starch, 65% acrylate, 12% water, and 1% crosslinking agent;

[0016] Preferably, the molecular weight of polyacrylol is 200 g / mol;

[0017] Preferably, the optimal combination of water-retaining agents is polyacrylamide: hydroxypropyl methylcellulose: sodium polyacrylate = 1:2:1;

[0018] The waterproof sealant is mainly composed of either calcium methylsilicate or silicone oil, used alone. Its function is to give the material a certain resistance to water erosion and increase the wetting angle between the cured material and water.

[0019] The auxiliary cementitious materials are mainly steel slag and mineral powder, and their function is to increase the overall density of the slurry material.

[0020] The defoamer is made by mixing polydimethylsiloxane, polyethylene glycol, polypropylene glycol, and glycerol polyoxypropylene ether in a mass ratio of 4:1:1:3. Its function is to prevent the generation of a large number of bubbles in the material during the stirring process and application.

[0021] The early strength agent is a mixture of sodium silicate and calcium formate in a mass ratio of 2:1, and its function is to promote early setting and early strength of the material in seawater.

[0022] Preferably, the sodium silicate modulus is 2.0 to 2.4;

[0023] Preferably, the purity of calcium formate is ≥90%;

[0024] The pigments and fillers are mainly one or a combination of talc and calcium phosphate, and their function is to fill and change the appearance color of the material.

[0025] The water-reducing agent is mainly a polycarboxylate water-reducing agent, which improves the fluidity of the slurry material and increases the density of the hardened slurry.

[0026] Preferably, the polycarboxylate superplasticizer has a solid content of 40%;

[0027] The water can be tap water or seawater.

[0028] In a second aspect, the present invention provides a preparation process for the above-mentioned solidification material for erosion prevention of offshore wind power pile foundations. The process apparatus includes a filter tank and a mixing tank. The filter tank is located above one side of the mixing tank, and the two are separated by a baffle. A baffle pin is installed at the baffle.

[0029] The bottom of the filter tank is equipped with a hydraulic lifting column, and a mud agitator is installed above it. A water storage tank is connected to one side of the filter tank. The mud agitator moves horizontally and backward via a double-shaft slide rail, and moves up and down via a telescopic rod.

[0030] Multiple storage tanks are installed above the mixing tank. A filter screen is installed on one side of the bottom of the mixing tank. A feed pipe is connected to the mixing tank located inside the filter screen. A high-pressure pump is connected to the feed pipe. A discharge pipe is installed at the output end of the high-pressure pump.

[0031] The process flow includes the following steps:

[0032] S1. Place seabed silt or land soil in the filtration tank, inject a certain amount of water into the filtration tank through the water storage tank, and use a mud mixer to fully mix it into a uniform mud slurry. The mixer can move freely up, down, left, right, forward and backward using a sliding rail and telescopic rod.

[0033] S2. Open the baffle pin and raise the filter tank by hydraulic lifting column. The well-mixed mud flows into the mixing tank through the filter screen under its own gravity. The function of the filter screen is to filter out impurities that are difficult to dissolve or cannot be dissolved, such as pebbles, coral and seaweed.

[0034] S3. Add curing agent, water-retaining agent, waterproofing and leak-stopping agent, auxiliary cementitious material, defoamer, early strength agent, pigments and fillers, and water-reducing agent sequentially to the mixing tank through the storage tank;

[0035] S4. Finally, use a mud mixer to thoroughly stir the mud in the mixing tank. After it is evenly stirred, use a high-pressure pump to extract the mud through a filter screen for use, or keep stirring at a low speed until it is ready for use.

[0036] A third aspect of the present invention provides an application of the above-mentioned solidification material for erosion protection of offshore wind turbine pile foundations in the protection and erosion resistance of offshore wind turbine generator piles.

[0037] In a fourth aspect, the present invention provides a construction method for the above-mentioned solidification material for scour prevention of offshore wind power pile foundations. The material is transported to the vicinity of the target pile location by a construction vessel. The submarine cable is avoided by using a cable distribution map. Four construction points are selected and the material outlets are fixed using a cross-shaped method. The material outlets are kept 50-100cm away from the points to be reinforced. A high-pressure pump is started to pour the prepared material into the designated location to complete the construction.

[0038] The beneficial effects of this invention are as follows:

[0039] 1. The present invention provides a curing material for scour prevention of offshore wind power pile foundations, which is low in cost, high in strength, has excellent water dispersion resistance during construction, and strong waterproof scour and ion erosion resistance after curing.

[0040] 2. The present invention provides a preparation process for a solidification material for erosion prevention of offshore wind power pile foundations, which can be carried out on a construction vessel, greatly reducing the cost of vessel transportation, ensuring the freshness of materials, and having a simple process that is environmentally friendly.

[0041] 3. The construction method of the solidification material for scour prevention of offshore wind power pile foundation provided by the present invention has low labor cost, is safe and reliable, and the four construction points can make up for the incomplete grouting caused by accidents in the adjacent positions, which greatly ensures the construction quality. Attached Figure Description

[0042] Figure 1This is a schematic diagram of the preparation process apparatus for a solidification material for erosion prevention of offshore wind power pile foundations proposed in this invention;

[0043] Figure 2 This is a schematic diagram of offshore construction methods.

[0044] Figure 1 In the middle, 1-mixing tank, 2-filtration tank, 3-high pressure pump, 4-feed pipe, 5-filter screen, 6-discharge pipe, 7-hydraulic lifting column, 8-slurry mixer, 9-slide rail, 10-baffle, 11-baffle pin, 12-storage tank. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] A process for preparing a solidification material for scour prevention of offshore wind power pile foundations, the process device includes a filter tank 2 and a mixing tank 1, the filter tank 2 is located above one side of the mixing tank 1, and the two are separated by a baffle 10, and a baffle pin 11 is installed at the baffle 10.

[0047] The bottom of the filter tank 2 is equipped with a hydraulic lifting column 7, and a mud agitator 8 is installed above it. A water storage tank is connected to one side of the filter tank 2. The mud agitator 8 moves horizontally and backward via a double-shaft slide rail 9, and moves up and down via a telescopic rod.

[0048] Multiple storage tanks 12 are installed above the mixing tank 1. A filter screen 5 is installed on one side of the bottom of the mixing tank 1. A feed pipe 4 is connected to the mixing tank 1 located inside the filter screen 5. The feed pipe 4 is connected to a high-pressure pump 3. A discharge pipe 6 is installed at the output end of the high-pressure pump 3. (See also...) Figure 1 ;

[0049] The process flow includes the following steps:

[0050] S1. Place 600-700 parts of seabed silt or land soil into the filter tank 2, inject 800-900 parts of water into the filter tank 2 through the water storage tank, and use the mud mixer 8 to fully stir to make a uniform mud slurry. The mud mixer 8 can move freely up, down, left, right and forward and backward through the slide rail 9 and the telescopic rod.

[0051] S2. Open the baffle pin 11 and raise the filter tank 2 by the hydraulic lifting column 7. The well-mixed mud flows into the mixing tank 1 through the filter screen 5 under its own gravity.

[0052] S3. Add 200-350 parts of curing agent, 3-6 parts of water-retaining agent, 1-5 parts of waterproof and leak-stopping agent, 10-50 parts of auxiliary cementitious material, 1-3 parts of defoamer, 1-4 parts of early strength agent, 0-5 parts of pigments and fillers, and 0-3 parts of water-reducing agent to the mixing tank 1 through the storage tank 12.

[0053] S4. Finally, use the mud mixer 8 to fully stir the mud in the mixing tank 1. After it is evenly stirred, use the high-pressure pump 3 to extract the mud through the filter screen 5 for use, or keep stirring at a low speed for later use.

[0054] The present invention will be further described in detail below with reference to specific embodiments. It should be noted that the specific embodiments are explanations of the present invention and not limitations thereof.

[0055] Example 1

[0056] 700 parts of seabed silt were placed in a filtration tank, and 900 parts of water were injected into the filtration tank through a storage tank. The mixture was thoroughly stirred with a mud mixer to form a uniform slurry. The baffle pin was opened, and the filtration tank was raised using a hydraulic lifting column. The uniformly mixed slurry flowed into the mixing tank through the filter screen under its own gravity. 250 parts of curing agent (PO425), 6 parts of water-retaining agent (polyacrylamide), 2 parts of waterproofing and leak-stopping agent (calcium methyl silicate), 50 parts of auxiliary cementitious material (steel slag), 1 part of defoamer, 1 part of early-strength agent, 0 parts of pigments and fillers, and 2 parts of water-reducing agent were added to the mixing tank through a storage tank in sequence. Finally, the mixture was thoroughly stirred in the mixing tank using a mud mixer to obtain a curing material for erosion protection of offshore wind power pile foundations, which is ready for use.

[0057] Example 2

[0058] 600 parts of seabed silt were placed in a filtration tank, and 800 parts of water were injected into the filtration tank through a storage tank. The mixture was thoroughly stirred with a mud mixer to form a uniform slurry. The baffle pin was opened, and the filtration tank was raised using a hydraulic lifting column. The uniformly mixed slurry flowed into the mixing tank through the filter screen under its own gravity. 230 parts of curing agent (PO425), 5 parts of water-retaining agent (polyacrylamide: hydroxypropyl methylcellulose = 1:1), 2 parts of waterproofing and sealing agent (silicone oil), 50 parts of auxiliary cementing material (steel slag: mineral powder = 1:4), 1 part of defoamer, 2 parts of early-strength agent, 2 parts of pigment and filler (talc powder), and 1 part of water-reducing agent were added to the mixing tank through a storage tank. Finally, the mixture was thoroughly stirred in the mixing tank using a mud mixer to obtain a curing material for erosion protection of offshore wind power pile foundations, which is ready for use.

[0059] Example 3

[0060] The difference from Example 1 is that terrestrial soil is used instead of seabed silt, while everything else is the same as in Example 1.

[0061] Example 4

[0062] The difference from Example 1 is that 800 parts of water are injected into the filter tank through a water storage tank, while everything else is the same as in Example 1.

[0063] Example 5

[0064] The difference from Example 1 is that the water-retaining agent composition is polyacrylamide: hydroxypropyl methylcellulose: sodium polyacrylate = 1:2:1, while all other components are the same as in Example 1.

[0065] Example 6

[0066] The difference from Example 1 is that the auxiliary cementitious material is 10 parts, while everything else is the same as in Example 1.

[0067] Example 7

[0068] The difference from Example 2 is that the amount of curing agent used is 300 parts, while everything else is the same as in Example 2.

[0069] Example 8

[0070] The difference from Example 2 is that the amount of defoamer used is 3 parts, while everything else is the same as in Example 2.

[0071] Example 9

[0072] The difference from Example 2 is that the amount of early strength agent used is 4 parts, while everything else is the same as in Example 2.

[0073] Example 10

[0074] The difference from Example 2 is that the amount of water-reducing agent used is 3 parts, while everything else is the same as in Example 2.

[0075] Comparative Example 1

[0076] The difference from Example 2 is that only cement is used.

[0077] Comparative Example 2

[0078] The difference from Example 2 is that the only materials used are cement and soil, with a mass ratio of cement to soil of 3:7.

[0079] The material properties of each embodiment and comparative example were tested, and the test results are shown in Table 1.

[0080] Table 1 Performance test results of solidification materials used for erosion prevention of offshore wind turbine pile foundations

[0081]

[0082] According to Table 1, the properties of the cured materials in Examples 1-10 meet the requirements, while the slurry volume of Comparative Examples 1 and 2 is too small to be sufficient for testing compressive strength.

[0083] Example 11

[0084] This embodiment describes a construction method for a solidification material used for scour prevention of offshore wind turbine pile foundations, as obtained in Embodiment 2. Figure 2 As shown, the above materials are transported to the vicinity of the target pile location by a construction vessel. The submarine cable is avoided by following the cable distribution map. Four construction points are selected and the material outlets are fixed using the cross method. The material outlets are kept 50cm away from the reinforcement points. The high-pressure pump is started to pour the prepared materials into the designated location to complete the construction.

[0085] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A preparation process for a curing material for erosion prevention of offshore wind turbine pile foundations, characterized in that, By weight, the curing material comprises the following components: 600-700 parts of seabed silt or terrestrial soil, 200-350 parts of curing agent, 3-6 parts of water-retaining agent, 1-5 parts of waterproofing and leak-stopping agent, 10-50 parts of auxiliary cementitious material, 1-3 parts of defoamer, 1-4 parts of early strength agent, 0-5 parts of pigments and fillers, 0-3 parts of water-reducing agent, and 800-900 parts of water. The process device includes a filter tank (2) and a stirring tank (1). The filter tank (2) is located above one side of the stirring tank (1), and the two are separated by a baffle (10). A baffle pin (11) is installed at the baffle (10). The bottom of the filter tank (2) is equipped with a hydraulic lifting column (7), and a mud agitator (8) is set above it. A water storage tank is connected to one side of the filter tank (2). The mud agitator (8) moves horizontally and backward through a double-shaft slide rail (9) and moves up and down through a telescopic rod. Multiple storage tanks (12) are provided above the mixing tank (1). A filter screen (5) is provided on one side of the bottom of the mixing tank (1). A feed pipe (4) is connected to the mixing tank (1) located inside the filter screen (5). A high-pressure pump (3) is connected to the feed pipe (4). A discharge pipe (6) is provided at the output end of the high-pressure pump (3). The process flow includes the following steps: S1. Place the seabed silt or land soil in the filter pool (2), inject a certain amount of water into the filter pool (2) through the water storage tank, and use the mud mixer (8) to fully stir it into a uniform mud slurry. The mud mixer (8) can move freely up, down, left, right and forward through the slide rail (9) and the telescopic rod. S2. Open the baffle pin (11) and raise the filter tank (2) by hydraulic lifting column (7). The well-mixed mud flows into the mixing tank (1) through the filter screen (5) under its own gravity. S3. Add curing agent, water-retaining agent, waterproofing and leak-stopping agent, auxiliary cementitious material, defoamer, early strength agent, pigments and fillers, and water-reducing agent to the mixing tank (1) in sequence through the storage tank (12); S4. Use the mud mixer (8) to fully stir in the mixing tank (1). After stirring evenly, use the filter screen (5) and the high-pressure pump (3) to extract the mud for use or keep stirring at a low speed until it is ready for use.

2. The preparation process of a solidification material for erosion prevention of offshore wind turbine pile foundations according to claim 1, characterized in that, The curing agent is ordinary silicate cement or phosphate cement.

3. The preparation process of a solidification material for erosion prevention of offshore wind turbine pile foundations according to claim 1, characterized in that, The water-retaining agent is one or more of the following: polyacrylamide, hydroxypropyl methylcellulose, sodium polyacrylate, starch-grafted acrylate, and polyacrylamide. The polyacrylamide composition is: 71% acrylamide, 21% potassium acrylate, 7.4% water, and 0.6% crosslinking agent. The hydroxypropyl methylcellulose has a viscosity of 100,000 and a purity of ≥95%. The sodium polyacrylate is a powdered sodium polyacrylate polymerized by emulsion polymerization. The starch-grafted acrylate composition is: 22% starch, 65% acrylate, 12% water, and 1% crosslinking agent. The polyacrylamide has a molecular weight of 200 g / mol.

4. The preparation process of a solidification material for erosion prevention of offshore wind turbine pile foundations according to claim 1, characterized in that, The waterproofing and sealing agent is calcium methylsilicate or silicone oil, and the auxiliary cementing materials are steel slag and mineral powder.

5. The preparation process of a solidification material for erosion prevention of offshore wind turbine pile foundations according to claim 1, characterized in that, The defoamer is prepared by mixing polydimethylsiloxane, polyethylene glycol, polypropylene glycol, and glycerol polyoxypropylene ether in a mass ratio of 4:1:1:

3.

6. The preparation process of a solidification material for erosion prevention of offshore wind turbine pile foundations according to claim 1, characterized in that, The early strength agent is a mixture of sodium silicate and calcium formate in a mass ratio of 2:1, with the sodium silicate having a modulus of 2.0 to 2.4 and the calcium formate having a purity of ≥90%.

7. The preparation process of a solidification material for erosion prevention of offshore wind turbine pile foundations according to claim 1, characterized in that, The pigments and fillers are one or a combination of talc and calcium phosphate; the water-reducing agent is a polycarboxylate water-reducing agent with a solid content of 40%; and the water is tap water or seawater.

8. The application of the solidified material for scour prevention of offshore wind turbine pile foundations obtained by the preparation process according to any one of claims 1-7 in the protection of offshore wind turbine generator piles.

9. A construction method for the solidification material for scour prevention of offshore wind power pile foundations obtained by the preparation process according to any one of claims 1-7, characterized in that, The material is transported to the vicinity of the target pile location by a construction vessel. The submarine cable is avoided by using the cable distribution map. Four construction points are selected and the material outlets are fixed using the cross method. The material outlets are kept 50-100cm away from the reinforcement points. The high-pressure pump is started to pour the prepared material into the designated location to complete the construction.

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