A high-strength grouting construction method for offshore booster station conductor frame

Abstract

The present application discloses a high-strength grouting construction method for an offshore booster station conductor frame, which comprises the following steps: installing an annular airbag on the inner wall of a sleeve of the conductor frame, and covering the outer surface of the annular airbag with an annular protective layer; after the conductor frame is sunk, inserting a foundation pile into a corresponding sleeve, so that the sleeve and the foundation pile form an annular space, and the annular airbag is tightened to seal the bottom position of the annular space; pumping grouting material into the annular space until the grouting material overflows from the top of the annular space, and then allowing the grouting material to stand, and finally completing the grouting construction, thereby preventing the annular airbag from directly contacting with debris in the seawater during the process of following the conductor frame sinking, reducing the probability of the airbag being punctured or scratched, and maintaining the intact annular airbag to seal the bottom position of the annular space by means of tightening, which is conducive to the smooth grouting and plugging construction.

Description

Technical Field

[0001] The present application relates to the field of offshore wind farm booster station construction, and in particular to a high-strength grouting construction method for an offshore booster station conductor frame. Background Art

[0002] As the global demand for clean energy grows, offshore wind power has developed rapidly as one of the important renewable energy sources. In offshore wind power projects, the stability and safety of offshore booster stations, as key facilities for power transmission, are of vital importance. In order to ensure the long-term operating performance of booster stations in harsh marine environments, their foundation design and construction technology have become the focus of research.

[0003] In the related technology, the foundation of the booster station commonly used in offshore wind farms is mainly composed of foundation piles, a conductor frame, and an upper assembly block, wherein the pile foundation and the conductor frame sleeve are connected by grouting, and the inner wall of the sleeve of the guide frame is installed with a guide block and a packer. The guide block plays a guiding role during the insertion of the foundation pile. The packer mainly realizes the sealing function through the expansion of the inflatable air bag. After the foundation pile is inserted into the corresponding sleeve, an annular space is formed between the sleeve and the foundation pile, and then the packer is started to seal the lower part of the annular space, and then grouting is carried out to achieve the purpose of grouting connection.

[0004] With regard to the above-mentioned related technologies, there are the following defects: in the sinking section of the conductor frame, since the air bag of the packer is completely exposed to the seawater, and the sharp objects often carried in the seawater, the air bag is easily punctured or scratched, which eventually leads to the failure of the packer plugging, resulting in leakage of grouting material during the grouting process, making it difficult to carry out the grouting and plugging construction smoothly, so there is still room for improvement. Summary of the invention

[0005] In order to facilitate the smooth completion of grouting and plugging construction, the present application provides a high-strength grouting construction method for an offshore booster station conductor frame.

[0006] The present application provides a method for high-strength grouting construction of an offshore booster station jacket, which adopts the following technical solution: A high-strength grouting construction method for an offshore booster station jacket comprises the following steps: S1: An annular airbag is installed on the inner wall of the sleeve of the catheter frame, and an annular protective layer is covered on the outer surface of the annular airbag; S2: After the jacket is sunk, the foundation pile is inserted into the corresponding sleeve. The sleeve and the foundation pile form an annular space, and the annular airbag is tightened to seal the bottom of the annular space. S3: Pump the grouting material into the annular space until the grouting material overflows from the top of the annular space, then let it stand to finally complete the grouting construction.

[0007] By adopting the above technical solution, the protective layer is pre-covered on the surface of the annular airbag, so that the annular airbag is wrapped between the protective layer and the sleeve, so as to avoid the annular airbag from direct contact with debris in the seawater during the process of following the sinking of the conductor frame, and reduce the probability of the airbag being punctured or scratched. After the conductor frame is sunk into place, pile driving construction is carried out, and the sleeve and the foundation pile form an annular space. The intact annular airbag is tightened to complete the purpose of sealing the bottom position of the annular space, which is conducive to the smooth grouting and sealing construction.

[0008] Preferably, in S1, the protective layer is detachably connected to the inner wall of the sleeve, and a lifting rope is fixedly connected to the protective layer, and the lifting rope extends out of the sleeve; after the catheter rack sinking step is completed in S2, the protective layer is lifted out of the sleeve by pulling the lifting rope upwards.

[0009] By adopting the above technical solution, a lifting rope is fixedly connected to the protective layer, and the lifting rope extends out of the sleeve. The protective layer can be lifted out of the sleeve by pulling the lifting rope upward so as to recover the protective layer.

[0010] Preferably, a mud scraper is provided on the inner wall of the sleeve, and the mud scraper is located below the annular airbag.

[0011] By adopting the above technical solution, during the foundation pile sinking process, the scraper plays a role in removing mud and preventing seabed mud from surging into the annular space.

[0012] Preferably, a sealing diaphragm is provided on the inner wall of the sleeve, and the sealing diaphragm is located below the mud scraper.

[0013] By adopting the above technical solution, during the foundation pile sinking process, the sealing diaphragm plays a role in blocking the upwelling of seabed sediment, which is beneficial to further improve the situation of sediment entering the annular space.

[0014] Preferably, during the foundation pile sinking process of S2, the annular airbag is first inflated, and the protective layer is pressed against the outer peripheral surface of the foundation pile under the expansion action of the annular airbag, so that the axis of the foundation pile and the axis of the casing remain coincident; when the foundation pile is sunk, the protective layer is hoisted out of the sleeve using a lifting rope, and then the annular airbag is further inflated, so that the surface of the annular airbag is sealed tightly against the outer peripheral surface of the foundation pile.

[0015] By adopting the above technical scheme, during the foundation pile sinking process, the foundation pile is first limited by the expansion effect of the annular airbag, so that the axis of the foundation pile and the axis of the casing remain coincident, which is beneficial to reducing the probability of the foundation pile shaking during the pile sinking process and directly colliding with the scraper, and is beneficial to the smooth completion of the pile sinking operation. In addition, during the pile sinking process, the protective layer has an anti-wear effect on the annular airbag, which is beneficial to reduce the wear of the airbag surface during the downward movement of the foundation pile.

[0016] Preferably, before the grouting construction step S3 is performed, the grouting hose of the grouting pump is lubricated.

[0017] By adopting the above technical solution, the grouting hose is first lubricated, which is helpful to reduce the blockage caused when pumping the grouting material.

[0018] Preferably, when performing the grouting construction step S3, two mixers are used to separately stir the grouting material, and the two mixers cyclically and alternately transport the stirred grouting material to the corresponding grouting pumps, and the two grouting pumps alternately perform grouting operations to pour the grouting material into the annular space.

[0019] By adopting the above technical solution, two mixers are used to separately mix the grouting material. The two mixers cyclically and alternately transport the mixed grouting material to the grouting pump, and the circulation operation is performed in sequence, which is beneficial to improving the grouting efficiency.

[0020] Preferably, when performing the grouting construction step S3, the grouting pump is first started at low pressure and then gradually pressurized until the normal grouting pressure range is reached.

[0021] By adopting the above technical solution, the grouting pump is started at low pressure first, which is beneficial to reduce the damage of the sleeve or slurry overflow caused by excessive grouting pressure.

[0022] Preferably, in S3, when the amount of grouting material used is greater than the theoretical amount of material used before grouting and the grouting height in the annular space reaches a specified height, the grouting is stopped to allow the bubbles in the grout to fully overflow.

[0023] By adopting the above technical solution, when the amount of grouting material is greater than the theoretical material amount before overflow and the grouting height in the annular space reaches a specified height, the grouting is stopped and the grouting material enters a static stage to allow the bubbles in the grouting material to fully overflow.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. Pre-cover the surface of the annular airbag with a protective layer, so that the annular airbag is wrapped between the protective layer and the sleeve, to prevent the annular airbag from direct contact with debris in the seawater during the process of following the casing frame sinking, and reduce the probability of the airbag being punctured or scratched. After the casing frame is sunk into place, pile sinking construction is carried out. The sleeve and the foundation pile form an annular space. The intact annular airbag is tightened to complete the purpose of plugging the bottom position of the annular space, which is conducive to the smooth grouting and plugging construction; 2. A lifting rope is fixedly connected to the protective layer, and the lifting rope extends out of the sleeve. The protective layer is lifted out of the sleeve by pulling the lifting rope upward, so as to facilitate the recovery of the protective layer; 3. During the foundation pile sinking process, the expansion effect of the annular airbag is first used to limit the foundation pile, so that the axis of the foundation pile and the axis of the casing remain coincident, which is conducive to reducing the probability of direct collision with the scraper due to shaking during the foundation pile sinking process, and is conducive to the smooth completion of the pile sinking operation. In addition, during the pile sinking process, the protective layer has an anti-wear effect on the annular airbag, which is conducive to reducing the situation where the surface of the airbag is worn during the downward movement of the foundation pile; 4. Use two mixers to stir the grouting material separately. The two mixers will circulate and alternately transport the stirred grouting material to the grouting pump, and perform the circulation operation in sequence, which is conducive to improving the grouting efficiency; 5. In the grouting step, when the amount of grouting material is greater than the theoretical material amount before overflow and the grouting height in the annular space reaches the specified height, the grouting is stopped and the grouting material enters a static stage to allow the bubbles in the grouting material to fully overflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the state when a foundation pile is inserted into a casing sleeve in a high-strength grouting construction method of an offshore booster station casing in an embodiment of the present application.

[0026] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0027] Explanation of the reference numerals: 1. catheter frame; 2. sleeve; 21. upper guide block; 22. lower guide block; 3. foundation pile; 4. annular airbag; 5. protective layer; 6. scraper; 7. sealing diaphragm. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-2 This application is described in further detail.

[0029] The present application embodiment discloses a high-strength grouting construction method for an offshore booster station jacket, referring to Figure 1 and Figure 2 , including the following steps: S1: The main grouting pipe and the spare grouting pipe are arranged on the jacket 1, which are used for grouting into the jacket sleeve 2 of the jacket 1 in the subsequent steps. A plurality of upper guide blocks 21 and a plurality of lower guide blocks 22 are fixed to the upper inner wall and the lower inner wall of the jacket sleeve 2 of the jacket 1, respectively. The guide blocks form a guide channel for inserting the foundation pile 3. The diameter of the guide channel is slightly larger than the outer diameter of the foundation pile 3, which can not only play a limiting guiding role, but also facilitate the smooth insertion of the foundation pile 3 into the sleeve 2. In this embodiment, the outer diameter of the foundation pile 3 is 3100mm, and the inner diameter of the sleeve 2 is 3290mm.

[0030] An annular airbag 4 is fixed to the inner wall of the sleeve 2, and the annular airbag 4 is arranged around the inner wall of the lower end of the sleeve 2. The air inlet of the annular airbag 4 penetrates the outside of the sleeve 2 and is connected to the air pipe. The annular airbag 4 is located below the lower guide block 22. In addition, a mud scraper 6 and a sealing diaphragm 7 are arranged on the inner wall of the sleeve 2, the mud scraper 6 is located below the annular airbag 4, and the sealing diaphragm 7 is located below the mud scraper 6.

[0031] The outer surface of the annular airbag 4 is covered with an annular protective layer 5, which is made of high-strength aramid fiber. In this embodiment, the protective layer 5 is detachably connected to the inner wall of the sleeve 2, and is temporarily fixed by a binding rope. The protective layer 5 is detachable from the annular airbag 4. A hanging rope is fixedly connected to the top of the protective layer 5, and the hanging rope extends out of the sleeve 2.

[0032] S2: The jacket 1 is accurately sunk onto the seabed. During the sinking process, the protective layer 5 protects the airbag, preventing the annular airbag 4 from directly contacting with debris in the seawater during the sinking process of the jacket 1, thereby reducing the probability of the airbag being punctured or scratched.

[0033] After the laying of the jacket 1 is completed, the foundation pile 3 is inserted into the corresponding sleeve 2, the foundation pile 3 pierces the sealing membrane 7 and is inserted into the seabed, and the sleeve 2 and the foundation pile 3 form an annular space with a width of 190 mm. The annular airbag 4 is tightened to seal the bottom of the annular space.

[0034] It should be emphasized that, during the sinking of the foundation pile 3, the annular airbag 4 is first inflated, and the protective layer 5 is pushed against the outer peripheral surface of the foundation pile 3 under the expansion effect of the annular airbag 4, so that the axis of the foundation pile 3 and the axis of the casing remain coincident, which is conducive to reducing the probability of the foundation pile 3 shaking during the sinking process and directly colliding with the scraper 6, so as to smoothly complete the pile sinking operation. During the pile sinking process, the protective layer 5 plays an anti-wear role on the annular airbag 4, which is conducive to reducing the situation where the surface of the airbag is worn during the downward movement of the foundation pile 3. When the foundation pile 3 is sunk, the hoisting rope is reeled in by the winch, and the hoisting rope pulls the protective layer 5, and the binding rope between the protective layer 5 and the inner wall of the sleeve 2 is broken, and finally the protective layer 5 is lifted out of the sleeve 2 to realize the recovery of the protective layer 5. Then the annular airbag 4 is continued to be inflated, so that the surface of the annular airbag 4 is sealed tightly against the outer peripheral surface of the foundation pile 3.

[0035] S3: The grouting equipment used in this embodiment includes a mixing system, a pumping system and a grouting material delivery system. Among them, the mixing system includes two mixers and one set of electric control cabinets. The pumping system includes two grouting pumps and two sets of grouting pipes. The grouting material delivery system includes two forklifts with a lifting capacity of not less than 3 tons and a lifting height of not less than 3.5m.

[0036] Before grouting, lubricate the grouting hose of the grouting pump to prevent blockage when pumping grouting materials. The amount of water used and the mixing of the lubrication materials must also be carried out in accordance with the product instructions provided by the material supplier. Specifically, first mix the lubrication materials in a mixer, add appropriate fresh water according to the material requirements and mix, and the lubrication materials can be pumped only after they meet the requirements after testing. When the mixing of the lubrication materials is halfway through, start mixing the grouting materials.

[0037] In this embodiment, two mixers are used to separately mix the grouting material. The two mixers cyclically and alternately transport the mixed grouting material to the grouting pump, and then the grouting pump injects the grouting material into the annular space.

[0038] Specifically, two mixers work simultaneously, one is mixing while the other is outputting the mixed half-ton bag of material to the pump; when the material is output to the pump after mixing, the other is mixing a new batch of half-ton bag of material; the cycle operation is carried out in sequence; according to the instructions of the person in charge of mixing, all the bag of grouting material is poured into the mixer, and the amount of water and mixing time are determined according to the material instructions to add water and mix to make the grouting slurry; the mixer takes samples to test the material performance on the grouting platform, and the mixed grouting material can be put into the pump only after it is confirmed that the indicators meet the requirements; according to the instructions of the person in charge of mixing, all the bag of grouting material is poured into the mixer, and the amount of water and mixing time are determined according to the material instructions to add water and mix to make the grouting slurry; the mixer takes samples to test the material performance on the grouting platform, and the mixed grouting material can be put into the pump only after it is confirmed that the indicators meet the requirements.

[0039] Before formal pumping, confirm again that all valves on the pipeline are in the open state. After confirmation, pumping is carried out to pump the grouting material into the annular space. At the beginning, the grouting pump is started at low pressure and continuously pumped at a large flow rate, and then gradually pressurized until the normal grouting pressure range is reached to reduce the situation where the grouting pressure is too high and causes damage to the sleeve 2 or slurry overflow. Continue pumping until the grouting material begins to overflow from the top of the grouting annular space. During the grouting process, the pressure, flow rate and slurry quality parameters of the slurry are monitored in real time to ensure that the grouting effect meets the requirements. If an abnormal increase in pressure is found, the pump must be stopped immediately, the condition of the grouting hose and the grouting effect must be checked, and the insertion position must be readjusted.

[0040] During the grouting process, always observe the value of the pressure gauge. Once the pressure suddenly increases and does not drop, first determine whether the grouting hose is blocked. Remove the grouting hose from the prefabricated grouting port and continue to pump the grout at the original grouting pumping speed. If the pressure gauge value still does not drop at this time, it means that the grouting hose is blocked. Immediately use the spare grouting hose to replace the main grouting hose for grouting. If the pressure gauge value drops, the prefabricated pipeline is blocked. Immediately restore the connection between the main grouting hose and the main prefabricated grouting port, and try to use pressure to flush the blockage point first; if the pressure gauge value drops appropriately, it means that the blockage point has been flushed and continue grouting; if this method is ineffective, stop grouting, remove the grouting hose, move it to another spare grouting port, and grouting.

[0041] When the amount of grouting material is greater than the theoretical amount of material before overflow and the grouting height in the annular space reaches the specified height, stop grouting and allow the grouting material in the annular space to begin to stand still so that the bubbles in the slurry can fully overflow. After the standing still is over, perform pressure screen slurry. After the pressure screen slurry is completed, stop pumping, and finally complete the grouting construction and remove the pipeline.

[0042] After the grouting stops, the grouting equipment and pipeline system need to be cleaned in the shortest possible time.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-strength grouting construction method for an offshore booster station jacket, characterized in that: The following steps are involved: S1: installing an annular airbag (4) on the inner wall of a sleeve (2) of a catheter frame (1), and covering the outer surface of the annular airbag (4) with an annular protective layer (5); S2: After the jacket (1) is sunk, the foundation pile (3) is inserted into the corresponding sleeve (2), the sleeve (2) and the foundation pile (3) form an annular space, and the annular airbag (4) is tightened to seal the bottom of the annular space; S3: Pump the grouting material into the annular space until the grouting material overflows from the top of the annular space, then let it stand to finally complete the grouting construction.

2. A high-strength grouting construction method for an offshore booster station jacket (1) according to claim 1, characterized in that: In the S1, the protective layer (5) is detachably connected to the inner wall of the sleeve (2), and a lifting rope is fixedly connected to the protective layer (5), and the lifting rope extends out of the sleeve (2); after the catheter frame (1) is lowered in the S2, the protective layer (5) is lifted out of the sleeve (2) by pulling the lifting rope upwards.

3. A high-strength grouting construction method for an offshore booster station jacket (1) according to claim 1, characterized in that: The inner wall of the sleeve (2) is provided with a mud scraper (6), and the mud scraper (6) is located below the annular airbag (4).

4. A high-strength grouting construction method for an offshore booster station jacket (1) according to claim 1, characterized in that: The inner wall of the sleeve (2) is provided with a sealing diaphragm (7), and the sealing diaphragm (7) is located below the mud scraper (6).

5. The high-strength grouting construction method for an offshore booster station jacket (1) according to claim 2, characterized in that: During the sinking process of the foundation pile (3) of S2, the annular airbag (4) is first inflated, and the protective layer (5) is pressed against the outer peripheral surface of the foundation pile (3) under the expansion effect of the annular airbag (4), so that the axis of the foundation pile (3) and the axis of the casing are kept coincident; when the sinking of the foundation pile (3) is completed, the protective layer (5) is hoisted out of the sleeve (2) by a hoisting rope, and then the annular airbag (4) is further inflated, so that the surface of the annular airbag (4) is sealed and pressed against the outer peripheral surface of the foundation pile (3).

6. A high-strength grouting construction method for an offshore booster station jacket (1) according to claim 1, characterized in that: Before carrying out the grouting construction step S3, the grouting hose of the grouting pump should be lubricated first.

7. A high-strength grouting construction method for an offshore booster station jacket (1) according to claim 1, characterized in that: When performing the grouting construction step of S3, two mixers are used to separately mix the grouting material. The two mixers circulate and alternately transport the mixed grouting material to the corresponding grouting pumps. The two grouting pumps perform grouting operations alternately to fill the grouting material into the annular space.

8. The high-strength grouting construction method for an offshore booster station jacket (1) according to claim 1, characterized in that: When carrying out the grouting construction step of S3, the grouting pump is first started at low pressure and then gradually pressurized until it reaches the normal grouting pressure range.

9. A high-strength grouting construction method for an offshore booster station jacket (1) according to claim 1, characterized in that: In S3, when the amount of grouting material used is greater than the theoretical amount of material used before grouting and the grouting height in the annular space reaches a specified height, the grouting is stopped to allow the bubbles in the grout to fully overflow.

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