Offshore wind power foundation component and construction method of offshore wind power foundation component based on geopolymer

Abstract

The invention is suitable for the technical field of offshore wind power equipment, and provides an offshore wind power foundation component and a geopolymer-based offshore wind power foundation component construction method, the component comprises a fan mounting bracket and a main positioning pile, and each mounting bracket supporting leg is provided with a seabed negative pressure mounting cylinder; the main positioning pile is in a hollow pipe shape and is provided with a main grouting opening, the auxiliary grouting pile in a hollow pipe shape is supplemented, the main positioning pile and the auxiliary grouting pile are jointly used for injecting geopolymer grout to reinforce a seabed rock-soil layer, and the construction method comprises the steps that the main positioning pile is pressed into the seabed, and then the seabed negative pressure cylinder is inserted into the rock-soil layer; starting a negative pressure pump to pump out seawater in the cylinder, and utilizing pressure difference to promote the seabed negative pressure cylinder to sink and fix; the geopolymer is injected into the top gap of the negative pressure cylinder, meanwhile, the geopolymer is injected into the rock-soil layer through the main positioning pile and the auxiliary grouting pile to reinforce the stratum, the negative pressure cylinder replaces a pile body to reduce the construction burden, the geopolymer which uses local materials is used for grouting to reinforce the seabed, and the structural stability and durability are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of offshore wind power equipment, and provides an offshore wind power foundation component and a construction method of the offshore wind power foundation component based on geopolymer. BACKGROUND

[0002] In the construction process of an offshore wind turbine, a wind power foundation is generally first constructed at sea as an installation base for the wind turbine and auxiliary equipment. Common wind power foundations include pile foundations and floating platform foundations. The floating platform foundation is supported by a floating pontoon and connected to the seabed rock layer by a rope cable. This structure has poor stability and is not suitable for most sea areas due to its poor response to severe weather. The pile foundation has more general applicability. The pile foundation generally has a single pile structure and a multi-pile structure. The common method is to first drive one or more positioning piles into the seabed rock layer to achieve fixation, and then install the wind turbine installation support and the pile together. The single pile foundation has insufficient bearing capacity, and if a larger wind turbine needs to be installed, the size of the single pile must be increased. However, the size of the pile requires a larger transport ship and pile driver. The construction difficulty of the multi-pile foundation increases with the number of piles. In order to ensure the smooth installation of the wind turbine support, the installation consistency between the multiple piles after completion of the pile driving is very high. In a harsh sea environment, the construction difficulty is very large. The seabed rock layer also seriously affects the pile driving effect. If the seabed rock layer has large gaps or too much silt, it will directly lead to insufficient continuous support of the subsequent pile, and even cause the wind turbine support to tilt or even collapse. SUMMARY

[0003] Therefore, the application provides an offshore wind power foundation component and a construction method of the offshore wind power foundation component based on geopolymer. Most of the piles are replaced by seabed negative pressure installation cylinders. The seabed negative pressure installation cylinders can be installed together with the wind turbine installation support before construction, reducing the influence of environmental factors during construction. The seabed rock layer of the construction area is grouted and solidified by the main positioning pile and the auxiliary grouting pile, improving the geological conditions of the target area and the durability of the wind turbine installation support.

[0004] To achieve the above purpose, the application provides the following technical solutions: An offshore wind power foundation component comprises: The fan mounting support comprises at least three mounting support legs, each of which is fixedly provided with a seabed negative pressure mounting cylinder at the lower end, the seabed negative pressure mounting cylinder is an open cylinder with an open lower end, and a negative pressure cylinder interface is arranged on the side of the seabed negative pressure mounting cylinder, and the negative pressure cylinder interface is connected with a negative pressure pump. The main positioning pile is arranged inside the fan mounting support, and the fan mounting support is provided with a pile body positioning hole matched with the upper end of the main positioning pile, and the upper end of the main positioning pile is detachably fixedly connected with the fan mounting support after penetrating through the pile body positioning hole.

[0005] Further, the main positioning pile is a hollow pipe, the upper end of the main positioning pile is provided with a main grouting interface, and the lower part of the outer side wall of the main positioning pile is provided with a plurality of main grouting openings.

[0006] Further, a plurality of auxiliary grouting piles are further arranged, the auxiliary grouting piles are hollow pipes, the upper end of the auxiliary grouting piles is provided with an auxiliary pile grouting interface, the outer side wall of the auxiliary grouting piles is provided with a plurality of auxiliary grouting openings, the main positioning pile is provided with a grouting flow divider, the grouting flow divider is provided with a plurality of auxiliary pile flow diversion interfaces, and the auxiliary pile grouting interface is in communication with one of the auxiliary pile flow diversion interfaces through a pipeline.

[0007] Further, the lower end of the main positioning pile is fixedly provided with a spiral tunneling head.

[0008] Meanwhile, a construction and building method of the above-mentioned offshore wind power foundation component based on geopolymer is also provided, which comprises the following steps: S1. The lower end of the main positioning pile is pressed into the seabed rock-soil layer, and then the fan mounting support is installed from the upper end of the main positioning pile downwards until the lower end opening of the seabed negative pressure mounting cylinder is inserted into the seabed rock-soil layer, in the process, the upper end of the main positioning pile penetrates into the inside of the fan mounting support; S2. After the step S1 is completed, the seawater in each seabed negative pressure mounting cylinder is pumped outwards by starting the negative pressure pump, and in the process of pumping out the seawater, a pressure difference is formed between the inside and outside of the seabed negative pressure mounting cylinder, which makes the lower end of the seabed negative pressure mounting cylinder further sink to a deeper part of the seabed rock-soil layer; S3. After the step S2 is completed, the gap between the inside top of the seabed negative pressure mounting cylinder and the seabed rock-soil layer is injected with geopolymer through the negative pressure cylinder interface, and after the geopolymer is solidified, the main positioning pile and the fan mounting support are detachably fixedly installed together.

[0009] Further, the step S1 also includes: pressing several auxiliary grouting piles into the seabed rock-soil layer respectively, then connecting the auxiliary pile grouting interface and one of the auxiliary pile shunt interfaces through a pipeline, and then injecting the geopolymer into the main positioning pile and the several auxiliary grouting piles through the main grouting interface, and the geopolymer in the main positioning pile and the several auxiliary grouting piles penetrates into the seabed rock-soil layer through the main grouting port and the auxiliary grouting port.

[0010] Further, it also includes a step S4: after the step S3 is completed, a gravel layer is stacked outside the part of the seabed negative pressure installation cylinder exposed outside the seabed rock-soil layer for reinforcement.

[0011] Further, the geopolymer includes the following components in weight percentage: 300-400 parts of sea mud base material, 200-300 parts of cement, 50-100 parts of fly ash, 50-80 parts of slag powder, 0-20 parts of silica fume, 400-500 parts of water, 1.8-4.5 parts of water reducing agent, and 2-4 parts of quick-setting agent.

[0012] Further, the preparation process of the geopolymer is as follows: Pre-mixing process: the sea mud base material 300-400 parts, cement 200-300 parts, fly ash 50-100 parts, and slag powder 50-80 parts are dry-mixed by a mixer for 3-5 minutes to obtain dry-mixed powder; Wet-mixing and forming process: first, mix water 400-500 parts, water reducing agent 1.8-4.5 parts, and quick-setting agent 2-4 parts together to obtain mixed water, then add the dry-mixed powder obtained in the above pre-mixing process to the mixed water in batches, and continuously stir for 5-8 minutes to obtain geopolymer in slurry form; Viscosity adjustment process: if the viscosity of the geopolymer obtained in the above wet-mixing and forming process is less than 30 seconds (measured by a Marsh funnel), continue to add silica fume until the viscosity of the geopolymer is 30-50 seconds (measured by a Marsh funnel).

[0013] Further, before the preparation process of the geopolymer, the sea mud base material needs to be treated in the following steps in sequence: desalination treatment step, dehydration and drying step, and grinding and activation step; Desalination treatment step: first, remove impurities from the sea mud base material by a vibrating screen, then mix and stir the sea mud base material with fresh water, and then let it stand and settle, after a period of time, suck out the upper liquid, then mix and stir the bottom sea mud base material with fresh water again, and then let it stand and settle, repeat the above steps several times until the conductivity of the upper liquid is less than 2000 μS / cm, at this time the bottom sea mud base material completes the desalination treatment; Dehydration and drying step: the sea mud base material after desalination treatment is dehydrated, so that the water content of the sea mud base material is less than or equal to 35%; Grinding activation step: the sea mud base material after dehydration and drying is mixed with quicklime and ball milled to a specific surface area greater than or equal to 400 m2 / kg.

[0014] Compared with the prior art, the beneficial effects of the present application are: The present application uses a sea bottom negative pressure installation cylinder installed on the feet of the installation frame to replace most of the installation pile body, only uses a smaller main positioning pile for pre-positioning, and inserts the lower end of the sea bottom negative pressure installation cylinder into the sea bottom rock-soil layer by using the negative pressure effect generated by the negative pressure pump to achieve convenient installation of the fan installation support, thereby reducing the construction difficulty and simplifying the construction process. The present application improves the soil layer strength of the construction area by grouting and solidifying the sea bottom rock-soil layer through the main positioning pile and the auxiliary grouting pile, and improves the anti-toppling performance of the fan installation support in the long-term use process. In combination with the offshore construction operation environment of the fan installation support, the sea mud base material is used as the main raw material of the geopolymer for grouting and solidification, which can be locally sourced and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A structure schematic view of a kind of offshore wind power foundation component mentioned in embodiment 1; Figure 2 A structure schematic view of a kind of offshore wind power foundation component mentioned in embodiment 2; Figure 3 A structure schematic view of the main positioning pile mentioned in embodiment 2; Figure 4 A structure schematic view of the auxiliary grouting pile mentioned in embodiment 2; Figure 5 A finished state schematic view of a kind of offshore wind power foundation component mentioned in embodiment 1 after installation construction; Figure 6 A finished state schematic view of a kind of offshore wind power foundation component mentioned in embodiment 2 after installation construction; Figure 7 A structure schematic view of the sea bottom negative pressure installation cylinder mentioned in the present application when being installed to the lower end opening and inserted into the sea bottom rock-soil layer; Figure 8 A structure schematic view of the sea bottom negative pressure installation cylinder mentioned in the present application after sea water is extracted and geopolymer is injected at the gap; Figure 9 A finished state schematic view of a kind of offshore wind power foundation component mentioned in embodiment 3 after the part outside the sea bottom rock-soil layer of the sea bottom negative pressure installation cylinder is stacked with gravel layer for reinforcement; In the figure: 100. Fan mounting bracket; 200. Submarine negative pressure installation cylinder; 300. Negative pressure pump; 400. Main positioning pile; 410. Main grouting interface; 420. Main grouting port; 430. Grouting distributor; 440. Spiral tunneling head; 500, Auxiliary grouting pile; 510, Auxiliary grouting port; 520, Auxiliary pile grouting interface. 600. Gravel layer. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] Example 1, refer to Appendix Figure 1 This invention provides an offshore wind power foundation component and a construction method for an offshore wind power foundation component based on a geopolymer. The offshore wind power foundation component includes a wind turbine mounting bracket 100 and a main positioning pile 400. The wind turbine mounting bracket 100 is used for subsequent installation of the offshore wind turbine and wind turbine power generation-related auxiliary equipment. The wind turbine mounting bracket 100 includes at least three mounting bracket legs, preferably four in this embodiment. A subsea negative pressure mounting cylinder 200 is fixedly installed at the lower end of each mounting bracket leg. The subsea negative pressure mounting cylinder 200 is an open-ended cylinder with an opening at the lower end. A negative pressure cylinder interface is provided on the side of the subsea negative pressure mounting cylinder 200, and the negative pressure cylinder interface connects to... There is a negative pressure pump 300, which is detachable and will be removed after the subsequent offshore wind power foundation components are installed. The main positioning pile 400 is located inside the wind turbine mounting bracket 100. The wind turbine mounting bracket 100 is provided with a pile positioning hole that matches the upper end of the main positioning pile 400. The upper end of the main positioning pile 400 passes through the pile positioning hole and is detachably and fixedly connected to the wind turbine mounting bracket 100. The lower end of the main positioning pile 400 is fixedly equipped with a spiral tunneling head 440. It should be noted that the main positioning pile 400 is not connected to the wind turbine mounting bracket 100 from the beginning. The timing of their installation should refer to the construction method of offshore wind power foundation components described below.

[0018] A construction method for the aforementioned offshore wind power foundation components based on geopolymers is also provided, comprising the following steps: S1. The lower end of the main positioning pile 400 is pressed into the seabed rock-soil layer. This step can be performed by a rotary pile driver. The lower end of the main positioning pile 400 is provided with a spiral digging head 440, which can be rotated to feed. The main positioning pile 400 is first installed to provide a positioning anchor point for the subsequent installation of the fan installation support 100. Then the fan installation support 100 is installed from the upper end of the main positioning pile 400 to the lower end of the seabed negative pressure installation cylinder 200, which is slightly inserted into the seabed rock-soil layer under the influence of its own gravity. At this time, the positional relationship between the seabed negative pressure installation cylinder 200 and the seabed rock-soil layer is as shown in the accompanying Figure 7 The main positioning pile 400 is inserted into the seabed rock-soil layer, and most of the cylinder body of each seabed negative pressure installation cylinder 200 is embedded into the seabed rock-soil layer. The fan installation support 100 is fixed by the main positioning pile 400 and the seabed negative pressure installation cylinder 200. S2. After the completion of step S1, the negative pressure pump 300 is started to pump out the seawater in each seabed negative pressure installation cylinder 200. During the pumping process, a pressure difference is formed between the inside and outside of the seabed negative pressure installation cylinder 200. This pressure difference causes the lower end of the seabed negative pressure installation cylinder 200 to sink further into the seabed rock-soil layer. In this way, the main part of the seabed negative pressure installation cylinder 200 is inserted into the seabed rock-soil layer, thereby completing the preliminary fixation of the fan installation support 100. S3. After the completion of step S2, a geological polymer (a kind of material similar to concrete slurry formed by mixing treated sea mud with cement and other materials, the specific components and preparation process of which are described in detail below) is injected into the gap between the inside top of the seabed negative pressure installation cylinder 200 and the seabed rock-soil layer through the negative pressure cylinder interface. At this time, the positional relationship between the seabed negative pressure installation cylinder 200 and the seabed rock-soil layer is as shown in the accompanying Figure 8 After the geological polymer solidifies, the main positioning pile 400 and the fan installation support 100 are detachably fixed and installed together. At this time, a flange is generally welded at a suitable position of the main positioning pile 400, and then connected to the fan installation support 100 through locking bolts and the like.

[0019] The completed state of the offshore wind power foundation component installation and construction is as shown in the accompanying Figure 5 As can be seen, at this time, the main positioning pile 400 is inserted into the seabed rock-soil layer, and most of the cylinder body of each seabed negative pressure installation cylinder 200 is embedded into the seabed rock-soil layer. The fan installation support 100 is fixed by the main positioning pile 400 and the seabed negative pressure installation cylinder 200.

[0020] The geopolymer in the above includes the following components by weight: 300-400 parts of sea mud base material, 200-300 parts of cement, 50-100 parts of fly ash, 50-80 parts of slag powder, 0-20 parts of silica fume, 400-500 parts of water, 1.8-4.5 parts of water reducing agent, and 2-4 parts of accelerator. Since the sea mud base material is a non-standard material, before the preparation process of the geopolymer, the sea mud base material needs to be treated in the following steps in sequence: salt removal treatment step, dehydration and drying step, and grinding and activation step. In the salt removal treatment step, the sea mud base material is first removed of impurities by a vibrating screen, then mixed and stirred with fresh water, and then allowed to stand and precipitate. After a period of standing and precipitating, the upper liquid is sucked out, and then the bottom sea mud base material is mixed and stirred with fresh water again, and then allowed to stand and precipitate. The above steps are repeated several times until the conductivity of the upper liquid is less than 2000 μS / cm. At this time, the bottom sea mud base material completes the salt removal treatment. The salt removal treatment mainly reduces the content of chloride salt (Cl⁻) to avoid corrosion of steel bars and reduce durability. In the dehydration and drying step, the sea mud base material that has completed the salt removal treatment is dehydrated so that the water content of the sea mud base material is ≤35%. In the grinding and activation step, the sea mud base material that has completed the dehydration and drying is mixed with quicklime and ball milled to a specific surface area ≥400 m² / kg. The main purpose is to improve the activity. After the sea mud base material continues to be pretreated, it can be put into the preparation of the geopolymer. The preparation process is as follows: In the premixing process, the sea mud base material 300-400 parts, cement 200-300 parts, fly ash 50-100 parts, and slag powder 50-80 parts are dry mixed by a stirrer for 3-5 minutes to obtain dry mixed powder. In the wet mixing and forming process, water 400-500 parts, water reducing agent 1.8-4.5 parts, and accelerator 2-4 parts are mixed together to prepare mixing water. Then the dry mixed powder prepared in the above premixing process is added to the mixing water in several times, and continuous stirring is carried out for 5-8 minutes to prepare a slurry-like geopolymer. In the viscosity adjustment process, if the viscosity of the geopolymer prepared in the above wet mixing and forming process is less than 30 s (measured data by a Marsh funnel), silica fume is continuously added so that the viscosity of the geopolymer is 30-50 s (measured data by a Marsh funnel).

[0021] The typical quality control indicators of the geopolymer prepared by the above steps are as follows: Density: 1.6-1.8 g / cm³; fluidity: 180-220 mm; initial setting time: 2-4 hours.

[0022] Meanwhile, in actual use, considering the requirements of the special environment of the sea, the prepared geopolymer can also be modified for salt corrosion resistance and underwater non-dispersibility. The salt corrosion resistance modification adopts Cl- shielding technology, specifically adding 5%-8% ultra-fine mineral powder or 8%-10% metakaolin in the geopolymer, and generating more C-S-H gel to wrap the salt through secondary hydration, while the underwater non-dispersibility improvement can be achieved by using a combination of tackifiers, with a specific formula of 0.1%-0.3% hydroxypropyl methyl cellulose (HPMC) + 0.05% polyacrylamide (PAM).

[0023] Embodiment 2, referring to the contents of Figure 2 , the offshore wind power foundation component in this embodiment also includes several auxiliary grouting piles 500 compared with the structure in embodiment 1, and the auxiliary grouting piles 500 are also hollow tubular, while the main positioning pile 400 is also hollow tubular, as shown in Figure 3 , the main positioning pile 400 is provided with a main grouting interface 410 at the upper end, and the outer sidewall of the main positioning pile 400 is provided with several main grouting openings 420, as shown in Figure 4 , the auxiliary grouting pile 500 is provided with an auxiliary pile grouting interface 520 at the upper end, and the outer sidewall of the auxiliary grouting pile 500 is provided with several auxiliary grouting openings 510, and the main positioning pile 400 is provided with a grouting flow divider 430, which is provided with several auxiliary pile flow diversion interfaces, and the grouting flow divider 430 can control each auxiliary pile flow diversion interface respectively through structures such as solenoid valves, and the auxiliary pile grouting interface 520 and one of the auxiliary pile flow diversion interfaces are connected through a pipeline, and among them, the auxiliary pile grouting interface 520 and the auxiliary pile flow diversion interface are all self-locking interfaces, and the self-locking interface is prior art, when the pipeline is pulled out of these interfaces, these interfaces can automatically lock to prevent seawater from entering.

[0024] Meanwhile in the present embodiment, the offshore wind power foundation component based on the construction method of geopolymer, compared with embodiment 1, in its step S1, further includes: a plurality of auxiliary grouting piles 500 are respectively pressed into the seabed rock-soil layer, after the pressing is completed, generally all auxiliary grouting ports 510 are arranged in the seabed rock-soil layer, the auxiliary grouting ports 510 are arranged in the height direction, then the auxiliary pile grouting interface 520 and one of the auxiliary pile shunt interfaces are connected together through the pipeline, then the geopolymer (the geopolymer used in the present embodiment is the same as the geopolymer mentioned in embodiment 1) is injected into the main positioning pile 400 and the plurality of auxiliary grouting piles 500 through the main grouting port 420 and the auxiliary grouting port 510, the geopolymer in the main positioning pile 400 and the plurality of auxiliary grouting piles 500 penetrates into the seabed rock-soil layer through the main grouting port 420 and the auxiliary grouting port 510, this step is mainly used for grouting and solidifying the seabed rock-soil layer at the installation position of the wind turbine installation support 100, the geopolymer uniformly penetrates into the seabed rock-soil layer in the region through the main grouting port 420 and the auxiliary grouting port 510, fills the gaps in the seabed rock-soil layer, solidifies the muddy seabed, so that the seabed rock-soil layer at this position can maintain structural stability for a long time, optimizes the construction environment of the wind turbine installation support 100, prolongs the service life of the wind turbine installation support 100, in the actual test of our company, the grouting pressure is 0.5-1.0 MPa, the grouting shunt 430 controls each auxiliary pile shunt interface through the electromagnetic valve to realize segmented intermittent injection, according to the practical data of our company, after the seabed rock-soil layer is solidified in this way, the seabed bearing capacity of the seabed rock-soil layer is increased from about 80 kPa to about 250 kPa, and the effect is remarkable.

[0025] Embodiment 3, refer to the content of the accompanying drawings Figure 9 Based on embodiments 1 and 2, steps S4 can be added to the offshore wind power foundation component based on the construction method of geopolymer in the two embodiments: after step S3 is completed, a gravel layer 600 is stacked outside the part of the seabed negative pressure installation cylinder 200 exposed outside the seabed rock-soil layer for reinforcement, this step not only can further reinforce the seabed negative pressure installation cylinder 200, but also can reduce the direct erosion of seawater to the surface of the seabed negative pressure installation cylinder 200, reduce the corrosion rate, and improve the service durability.

[0026] In the description of the application, it should be understood that the orientation words such as "front, back, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate and imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the application, the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0027] The above is only the preferred embodiment of the application, and any skilled person in the art can modify the application or modify it into an equivalent technical solution using the above-described technical solutions. Therefore, any simple modification or equivalent replacement according to the technical solutions of the application is within the scope of protection claimed by the application.

Claims

1. A component for offshore wind power foundations, characterized in that, include: A fan mounting bracket (100) includes at least three mounting bracket legs. A subsea negative pressure mounting cylinder (200) is fixedly installed at the lower end of each mounting bracket leg. The subsea negative pressure mounting cylinder (200) is an open cylinder with an open lower end. A negative pressure cylinder interface is provided on the side of the subsea negative pressure mounting cylinder (200), and a negative pressure pump (300) is connected to the negative pressure cylinder interface. The main positioning pile (400) is located inside the wind turbine mounting bracket (100). The wind turbine mounting bracket (100) is provided with a pile positioning hole that matches the upper end of the main positioning pile (400). The upper end of the main positioning pile (400) passes through the pile positioning hole and is detachably and fixedly connected to the wind turbine mounting bracket (100).

2. The offshore wind power foundation component according to claim 1, characterized in that: The main positioning pile (400) is a hollow tube. The upper end of the main positioning pile (400) is provided with a main grouting interface (410), and the lower part of the outer side wall of the main positioning pile (400) is provided with several main grouting ports (420).

3. The offshore wind power foundation component according to claim 2, characterized in that: It also includes several auxiliary grouting piles (500), which are hollow tubes. The upper end of the auxiliary grouting pile (500) is provided with an auxiliary pile grouting interface (520). The outer side wall of the auxiliary grouting pile (500) is provided with several auxiliary grouting ports (510). The main positioning pile (400) is provided with a grouting diverter (430). The grouting diverter (430) is provided with several auxiliary pile diversion interfaces. The auxiliary pile grouting interface (520) is connected to one of the auxiliary pile diversion interfaces through a pipe.

4. A type of offshore wind power foundation component according to any one of claims 1 to 3, characterized in that: The lower end of the main positioning pile (400) is fixedly equipped with a spiral tunneling head (440).

5. A construction method for offshore wind power foundation components based on geopolymers according to claim 4, characterized in that, Includes the following steps: S1. Press the lower end of the main positioning pile (400) into the seabed rock and soil layer, and then install the wind turbine mounting bracket (100) from above the main positioning pile (400) downwards until the lower end opening of the seabed negative pressure mounting cylinder (200) is inserted into the seabed rock and soil layer. During this process, the upper end of the main positioning pile (400) penetrates into the inside of the wind turbine mounting bracket (100). After steps S2 and S1 are completed, the negative pressure pump (300) is started to extract the seawater inside each seabed negative pressure installation cylinder (200) outward. During the seawater extraction process, a pressure difference will be formed between the inside and outside of the seabed negative pressure installation cylinder (200). This pressure difference will cause the lower end of the seabed negative pressure installation cylinder (200) to sink further into the seabed rock and soil layer. After steps S3 and S2 are completed, a geopolymer is injected into the gap between the top of the inner side of the seabed negative pressure installation cylinder (200) and the seabed rock and soil layer through the negative pressure cylinder interface. After the geopolymer solidifies, the main positioning pile (400) and the wind turbine mounting bracket (100) are detachably and fixedly installed together.

6. The construction method for offshore wind power foundation components based on geopolymers according to claim 5, characterized in that, Step S1 further includes: pressing several auxiliary grouting piles (500) downward into the seabed rock and soil layer respectively, then connecting the grouting inlet (520) of the auxiliary piles with one of the auxiliary pile diversion inlets through a pipe, and then injecting geopolymer into the main positioning pile (400) and several auxiliary grouting piles (500) through the main grouting inlet (410). The geopolymer injected into the main positioning pile (400) and several auxiliary grouting piles (500) penetrates into the seabed rock and soil layer through the main grouting inlet (420) and the auxiliary grouting inlet (510).

7. The construction method for offshore wind power foundation components based on geopolymers according to claim 6, characterized in that, It also includes step S4: After step S3 is completed, a layer of crushed stone (600) is piled on the outside of the part of each seabed negative pressure installation cylinder (200) that is exposed to the seabed rock and soil layer for reinforcement.

8. A construction method for offshore wind power foundation components based on geopolymers according to any one of claims 5-7, characterized in that: The geopolymer comprises the following components in parts by weight: 300-400 parts marine mud base, 200-300 parts cement, 50-100 parts fly ash, 50-80 parts slag powder, 0-20 parts silica fume, 400-500 parts water, 1.8-4.5 parts water-reducing agent, and 2-4 parts quick-setting agent.

9. The construction method for offshore wind power foundation components based on geopolymers according to claim 8, characterized in that: The preparation process of the geopolymer is as follows: In the premixing process, 300-400 parts of the marine mud base material, 200-300 parts of cement, 50-100 parts of fly ash and 50-80 parts of slag powder are dry-mixed in a mixer for 3-5 minutes to obtain dry-mixed powder. In the wet mixing molding process, 400-500 parts of water, 1.8-4.5 parts of water-reducing agent and 2-4 parts of quick-setting agent are mixed together to prepare mixing water. Then, the dry powder obtained in the above premixing process is added to the mixing water in batches and stirred continuously for 5-8 minutes to obtain a slurry-like geopolymer. During the viscosity adjustment process, if the viscosity of the geopolymer obtained by the above wet mixing molding process is less than 30s (data measured by a Marsh funnel meter), silica fume is continuously added until the viscosity of the geopolymer reaches 30s-50s (data measured by a Marsh funnel meter).

10. A construction method for offshore wind power foundation components based on geopolymers according to claim 9, characterized in that: Before the preparation of the geopolymer, the marine mud base material first needs to undergo the following treatment steps in sequence: desalination treatment, dehydration and drying, and grinding and activation. Desalination process: First, remove impurities from the marine mud base material by passing it through a vibrating screen. Then, mix the marine mud base material with fresh water, stir, and let it settle. After settling for a period of time, remove the upper liquid. Then, mix the bottom marine mud base material with fresh water again, stir, and let it settle. Repeat the above steps multiple times until the conductivity of the upper liquid is less than 2000 μS / cm. At this point, the desalination process of the bottom marine mud base material is complete. Dehydration and drying step: Dehydrate the above-mentioned desalinated marine mud base material so that the moisture content of the marine mud base material is ≤35%; Grinding and activation step: Mix the above-mentioned dehydrated and dried marine mud base material with quicklime, and ball mill until the specific surface area is ≥400㎡ / kg.

Images