Offshore pile foundation pile sinking method based on self-elevating platform ship

Abstract

The invention discloses an offshore pile foundation pile sinking method based on a self-elevating platform ship. The offshore pile foundation pile sinking method based on the self-elevating platform ship has the advantages that the construction cost is saved, the construction risk is reduced, and the pile sinking effect is good. The method comprises the steps that a self-elevating platform ship is moved to a foundation pile, and a pile stabilizing embracing arm located on the self-elevating platform ship is located above the foundation pile; the pile legs of the self-elevating platform ship extend into the water surface, and the self-elevating platform ship is jacked; hoisting the pile feeder through the self-elevating platform ship, and lowering the pile feeder above the pile stabilizing embracing arm until the pile feeder is in butt joint with the foundation pile; building a construction platform on the self-elevating platform ship; a rotary drilling machine located on the self-elevating platform ship is moved to the construction platform, and a drill bit of the rotary drilling machine extends into the foundation pile for earth cutting; hammering and sinking the foundation pile; and the excavated soil is backfilled into the foundation pile. The method is applied to the technical field of offshore jacket foundation construction.

Description

Technical Field

[0001] The present invention relates to the technical field of the construction of offshore jacket foundations, and particularly relates to a method for driving offshore pile foundations based on a jack-up platform vessel. Background Art

[0002] At present, the four-pile jacket foundation is one of the mainstream foundation forms of domestic offshore wind turbines. Under harsh geological conditions, when using the traditional foundation pile driving process, it often occurs that the foundation pile is difficult to be driven to the designed elevation at one time. If the hammering energy is forcibly increased, problems such as pile body and equipment damage may be caused, seriously affecting the safety and construction economy of the pile foundation structure. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method for driving offshore pile foundations based on a jack-up platform vessel that saves construction costs, reduces construction risks, and has good pile driving effects.

[0004] The technical solution adopted by the present invention is as follows: The method for driving offshore pile foundations based on a jack-up platform vessel includes the following steps:

[0005] Step S1: Move the jack-up platform vessel to the position of the foundation pile so that the pile stabilizing arm on the jack-up platform vessel is located above the foundation pile;

[0006] Step S2: Extend the legs of the jack-up platform vessel into the water surface and insert them into the mud surface to lift the jack-up platform vessel;

[0007] Step S3: Hoist and lower the pile driver through the jack-up platform vessel and lower the pile driver above the pile stabilizing arm until the pile driver is docked with the foundation pile;

[0008] Step S5: Build a construction platform on the jack-up platform vessel so that the construction platform is located above the pile stabilizing arm;

[0009] Step S6: Move the rotary drilling rig on the jack-up platform vessel to the construction platform and extend the drill bit of the rotary drilling rig into the foundation pile to excavate soil;

[0010] Step S7: Hammer the foundation pile;

[0011] Step S8: Backfill the excavated soil into the foundation pile.

[0012] Further, the following steps are also included between step S3 and step S5:

[0013] Step S4: Adjust the legs to raise the height of the jack-up platform vessel so that the deck surface of the jack-up platform vessel is higher than the pile top of the pile driver.

[0014] Further, in step S1, it includes the following steps:

[0015] Step S101, perform initial positioning of the jack-up platform vessel according to the navigation;

[0016] Step S102, move the vessel by warping the anchor to align the center of the pile stabilizing arms on the jack-up platform vessel with the center of the foundation pile; wherein, the pile stabilizing arms are installed at the stern of the jack-up platform vessel.

[0017] Further, in step S2, it includes the following steps:

[0018] Step S201, extend the legs of the jack-up platform vessel underwater in the form of diagonal ballasting and insert them into the mud surface to lift the jack-up platform vessel;

[0019] Step S202, during the lifting process, appropriately relax the anchor cables to maintain the overall flatness of the platform.

[0020] Further, in step S3, it includes the following steps:

[0021] Step S301, hang the sling of the pile extractor on the main hook of the jack-up platform vessel and connect the pile extractor to the pile driver;

[0022] Step S302, flip the pile driver vertically by means of the stop at the tail of the pile driver;

[0023] Step S303, hoist the pile driver above the pile stabilizing arms by rotating the main hook boom of the jack-up platform vessel, and then lower the pile driver; wherein, the pile stabilizing arms hold the pile driver when it is lowered.

[0024] Step S304, when the pile driver is lowered to a preset distance from the top of the foundation pile, divers enter the water to assist in observing the alignment situation and guide the pile driver to insert into the foundation pile; wherein, the lower end of the pile driver is coated with a waterproof sealant to form a sealing structure at the contact between the pile driver and the foundation pile.

[0025] Further, in step S5, it includes the following steps:

[0026] Step S501, weld a cantilevered construction platform on the stern of the jack-up platform vessel, and the construction platform is located above the pile stabilizing arms;

[0027] Step S502, lay steel plates on the construction platform.

[0028] Further, in step S6, it includes the following steps:

[0029] Step S601, drive the rotary drilling rig to the construction platform at the stern and extend the drill bit of the rotary drilling rig into the foundation pile; wherein, the rotary drilling rig is connected to the drill bit through a drill pipe.

[0030] Step S602, fix the position of the rotary drilling rig, calibrate the horizontality of the rotary drilling rig by a level ruler, and calibrate the vertical line and the pile position by a plumb line;

[0031] Step S603, placing a water pump connected to seawater into the pile driver, and continuously injecting seawater into the pile driver to keep the water level in the pile driver at the same height as the top of the pile driver;

[0032] Step S604: extract the drill cuttings from the drill pipe by air lift reverse circulation, and use a flexible wear-resistant hose to connect the discharge port of the rotary drilling rig to discharge the drill cuttings into a sedimentation tank on the jack-up platform; the operator needs to observe whether the drill pipe is vertical and control the drilling depth by a depth counter until the designed depth is reached; during the recovery of the drill cuttings, part of the seawater in the sedimentation tank is discharged;

[0033] Step S605: After the drilling is completed, the rotary drill retracts the drill rod and lifts the drill bit out of the pile driver;

[0034] Step S606: The rotary drilling rig retreats to its original position and the construction platform is removed.

[0035] Furthermore, during the drilling process in step S604, the rotary drilling rig lowers the drill bit to contact the mud surface, and the center of the hole is centered through the main mast quadrilateral adjustment system and the walking system. When drilling, the drill bit is first touched to the ground, and the reset operation is performed through the reset button on the display to record the original position of the drilling rig drill bit. At this time, the display shows the information of the current position of the drilling hole. The operator can monitor the actual working position of the drilling hole, the advance position of each time and the hole depth position through the display, thereby operating the drilling operation.

[0036] Further, in step S7, it includes the following steps:

[0037] Step S701, adjusting the pile legs of the jack-up platform vessel so that the height of the jack-up platform vessel is adjusted downward;

[0038] Step S702: hoisting a hydraulic hammer through the main hook of the jack-up platform ship, and connecting the hydraulic hammer to the top of the pile driver;

[0039] Step S703, start the hydraulic hammer to hammer and sink the pile; during the initial pile sinking, use a small amount of energy to hammer, and gradually increase the hammering energy as the foundation pile slowly sinks; during the pile sinking process, the surveyor sets up the surveying equipment on the jack-up platform to measure and verify the verticality and elevation of the foundation pile;

[0040] Step S704: After the pile sinking is completed, the hydraulic hammer is hoisted back onto the deck of the jack-up platform vessel.

[0041] Further, in step S8, it includes the following steps:

[0042] Step S801: Use a pumping device to send the drilled soil in the sedimentation tank into the foundation pile and gradually backfill it to the designed position;

[0043] Step S802: After the backfilling is completed, use a self-elevating platform vessel to lift the pile driver back onto the deck, and divers go underwater to measure the backfill height of the foundation pile of the pre-driven pile.

[0044] The beneficial effects of the present invention are as follows:

[0045] Compared with the deficiencies of the prior art, in the present invention, by mounting a rotary drill on a self-elevating platform vessel, the soil inside the foundation pile that is not driven to the designed position at one time is drilled and recovered to reduce the resistance inside the pile, and then the pile is driven again by hammering. Further, the excavated soil is backfilled into the pile to achieve the foundation pile being driven to the designed elevation and ensure the stability of the bearing capacity of the foundation pile. Therefore, the present invention can drive the foundation pile to the designed elevation while reducing the overall construction cost and ensuring the safety of the construction process, making the present invention have the advantages of saving construction costs, reducing construction risks, and having good pile driving effects. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0047] Figure 1 is the flow schematic diagram of the present invention;

[0048] Figure 2 is the plan view of the present invention when positioning the self-elevating platform vessel;

[0049] Figure 3 is the plan view of the present invention when jacking up the self-elevating platform vessel;

[0050] Figure 4 is the plan view of the present invention when hoisting and installing the pile driver;

[0051] Figure 5 is the plan view of the present invention when building the construction platform Figure 1 ;

[0052] Figure 6 is the plan view of the present invention when building the construction platform Figure 2 ;

[0053] Figure 7It is a plan view of the present invention during drilling construction;

[0054] Figure 8 It is a plan view of the present invention during pile driving by hammering;

[0055] Figure 9 It is a plan view of the present invention during backfilling the soil inside the pile.

[0056] The reference numerals are as follows:

[0057] 1. Jack-up platform vessel; 2. Foundation pile; 3. Pile-stabilizing holding arm; 5. Leg; 6. Pile driver; 7. Construction platform; 8. Rotary drilling rig; 9. Drill bit; 10. Drill pipe; 11. Sedimentation tank; 12. Hydraulic hammer; 13. Pile lifter.

[0058] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0059] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0060] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, clockwise, counterclockwise, etc., are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0061] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0062] As Figures 1 to 9 shown, in this embodiment, a method for driving piles in the sea based on a jack-up platform vessel includes the following steps:

[0063] Step S1: Move the jack-up platform vessel 1 to the foundation pile 2 so that the pile-holding arm 3 on the jack-up platform vessel 1 is positioned above the foundation pile 2;

[0064] Specifically, the pile-holding arm 3 is a semi-circular pile-holding arm made of HW300 steel and is welded below the stern of the vessel.

[0065] Step S2: Extend the legs 5 of the jack-up platform vessel 1 into the water and insert them into the mud surface to lift the jack-up platform vessel 1;

[0066] Step S3: Lift and install the pile driver 6 by the jack-up platform vessel 1 and lower the pile driver 6 above the pile-holding arm 3 until the pile driver 6 is docked with the foundation pile 2;

[0067] Specifically, the jack-up platform vessel 1 locates the center of the foundation pile 2 according to the center of the pile-holding arm 3. After positioning is completed, the legs 5 are lifted, and then the main hoist boom is raised to install the pile driver 6 on the top of the foundation pile 2 as a casing.

[0068] Step S5: Build a construction platform 7 on the jack-up platform vessel 1 so that the construction platform 7 is located above the pile-holding arm 3;

[0069] Step S6: Move the rotary drill 8 on the jack-up platform vessel 1 to the construction platform 7 and extend the drill bit 9 of the rotary drill 8 into the foundation pile 2 for excavation;

[0070] Specifically, the drill bit 9 passes through the pile driver 6 and then extends into the foundation pile 2 for excavation. When excavating the soil inside the pile, the pile driver 6 can be directly used as the casing for rotary drill construction, eliminating the need to fabricate casings of different heights separately, effectively saving construction costs.

[0071] Step S7: Carry out hammer-driven piling for the foundation pile 2;

[0072] Step S8: Backfill the excavated soil into the foundation pile 2.

[0073] Specifically, the excavated soil is re-backfilled into the pile after the pile foundation is driven to the design elevation, eliminating the need to purchase and transport sand and gravel for backfilling, effectively ensuring the stability of the pile foundation soil bearing capacity and saving construction costs.

[0074] It should be noted that the jack-up platform vessel 1 retracts the legs 5 and adjusts the vessel position to the next foundation pile 2, and uses the same method to sequentially complete the secondary piling construction of the remaining foundation piles 2.

[0075] It can be seen from the above content that the above steps all use the self-elevating platform ship 1 to carry out rotary drilling construction and subsequent pile driving construction, and there is no need to design and modify the traditional drilling construction platform 7; even if the foundation piles 2 that cannot be sunk in place at one time have different elevations, the self-elevating platform ship 1 can freely adjust the jacking height to adapt to the elevation of the foundation piles 2; moreover, the self-elevating platform ship 1 is not affected by swells, so that the hammer can be quickly completed during the pile driving construction, the construction efficiency is greatly improved, and the construction safety risk is reduced; after the rotary drilling construction is completed, there is no need to replace the floating crane ship for pile driving construction, which reduces the construction cost.

[0076] With respect to the deficiencies of the prior art, in the present invention, a rotary drilling rig 8 is mounted on a self-elevating platform ship 1, and the soil inside the foundation piles 2 that have not been sunk into place in one go is drilled and recovered to reduce the resistance inside the piles, and then a secondary hammering is performed to sink the piles, and the excavated soil is further backfilled inside the piles to sink the pile foundation to the designed elevation and ensure the stability of the pile foundation bearing capacity. Therefore, the present invention can sink the pile foundation to the designed elevation while reducing the overall construction cost and ensuring the safety of the construction process, so that the present invention has the advantages of saving construction costs, reducing construction risks and having a good pile sinking effect.

[0077] In some embodiments, the following steps are further included between step S3 and step S5:

[0078] Step S4: adjust the pile legs 5 to raise the height of the jack-up platform vessel 1 so that the deck surface of the jack-up platform vessel 1 is higher than the pile top of the pile driver 6. Specifically, by adjusting the jack-up height of the pile legs 5 of the jack-up platform vessel 1, the deck surface is about 1 meter higher than the top of the pile driver 6 to have a suitable construction height.

[0079] like Figure 2 As shown, in some embodiments, in step S1, it includes the following steps:

[0080] Step S101, performing initial positioning of the self-elevating platform vessel 1 according to navigation;

[0081] Step S102 , the center of the pile stabilizing arm 3 on the self-elevating platform vessel 1 is made to coincide with the center of the foundation pile 2 by anchoring and moving the vessel; wherein the pile stabilizing arm 3 is installed at the stern of the self-elevating platform vessel 1 .

[0082] Specifically, the rotary drilling rig 8, mud extraction equipment and pipelines are barged onto the deck of the jack-up platform ship 1 in advance; the jack-up platform is initially positioned according to the navigation positioning software, and after the anchor is dropped, the anchor is moved according to the real-time display of the navigation software so that the center of the pile stabilizing arm 3 coincides with the center of the foundation pile 2 to achieve precise positioning.

[0083] like Figure 3 As shown, in some embodiments, in step S2, it includes the following steps:

[0084] Step S201: Insert the leg 5 of the jack-up platform vessel 1 into the water in the form of diagonal ballast and then insert it into the mud surface to lift the jack-up platform vessel 1.

[0085] Step S202: During the lifting process, appropriately loosen the anchor cables to maintain the overall flatness of the platform.

[0086] As Figure 4 shown, in some embodiments, in step S3, it includes the following steps:

[0087] Step S301: Hang the sling of the pile extractor 13 on the main hook of the jack-up platform vessel 1 and connect the pile extractor 13 to the pile driver 6.

[0088] Step S302: Flip the pile driver 6 vertically through the stop at the tail of the pile driver 6.

[0089] Step S303: Lift the pile driver 6 above the pile stabilizing arm 3 by rotating the main hook boom of the jack-up platform vessel 1 and then lower the pile driver 6; wherein, the pile stabilizing arm 3 holds the pile driver 6 when the pile driver 6 is lowered.

[0090] Specifically, the pile stabilizing arm 3 provides position guidance for the installation of the pile driver 6 and provides a stabilizing effect for it after the installation of the pile driver 6 is completed, reducing the shaking of the pile body of the pile driver 6.

[0091] Step S304: When the pile driver 6 is lowered to a preset distance from the top of the foundation pile 2, the diver enters the water to assist in observing the alignment situation and guides the pile driver 6 to insert into the foundation pile 2; wherein, a waterproof sealant is applied to the lower end of the pile driver 6 to form a sealing structure at the contact between the pile driver 6 and the foundation pile 2.

[0092] Specifically, when the pile driver 6 is lowered to about 1.5 m above the top of the foundation pile 2, the diver enters the water to assist in observing the alignment situation and guides the pile driver 6 to insert into the steel pipe pile.

[0093] As Figure 5 and Figure 6 shown, in some embodiments, in step S5, it includes the following steps:

[0094] Step S501: Weld a cantilevered construction platform 7 on the stern of the jack-up platform vessel 1, and the construction platform 7 is located above the pile stabilizing arm 3.

[0095] Step S502: Lay steel plates on the construction platform 7.

[0096] Specifically, the construction platform 7 is a cantilevered construction operation platform made of double-ply HW300 steel sections, and is located at the stern, and 20-mm thick steel plates are laid on the upper part of the steel sections.

[0097] As Figure 7 shown, in some embodiments, in step S6, it includes the following steps:

[0098] Step S601: Drive the rotary drilling rig 8 to the construction platform 7 at the stern of the ship, and insert the drill bit 9 of the rotary drilling rig 8 into the foundation pile 2; wherein, the rotary drilling rig 8 is connected to the drill bit 9 through the drill pipe 10;

[0099] Step S602: Fix the position of the rotary drilling rig 8, correct the level of the rotary drilling rig 8 with a spirit level, and check the vertical line and the pile position with a plumb bob;

[0100] Specifically, by fixing the position of the rotary drilling rig 8 to ensure that the rotary drilling rig 8 does not tilt or move during construction; after the rotary drilling rig 8 is in place, use a spirit level to correct the machine level, and at the same time use a plumb bob to check the vertical line and the pile position to ensure that the borehole is vertically straight and avoid deviation.

[0101] Step S603: Place the water suction pipe connected to the sea water into the pile driver 6, and continuously inject sea water into the pile driver 6 to keep the water surface in the pile driver 6 at the same height as the top of the pile driver 6;

[0102] Specifically, the water suction pipe is connected to a water pump, and the water suction pipe connected to the sea water is placed into the pile driver 6 in advance, and sea water is continuously injected into the pile driver 6 to keep the water surface in the pile driver 6 always close to the height of the top of the pile driver 6.

[0103] Step S604: Use the air-lift reverse circulation method to extract the drill cuttings from the drill pipe 10, and connect the slag discharge port of the rotary drilling rig 8 with a flexible wear-resistant hose to discharge the drill cuttings and soil into the sedimentation tank 11 located on the jack-up platform vessel 1; wherein, the operator needs to observe whether the drill pipe 10 is vertical, and control the drilling depth through a depth counter until the designed depth is drilled; during the recovery of the drill cuttings and soil, part of the sea water in the sedimentation tank 11 is discharged;

[0104] Specifically, a sedimentation tank 11 is arranged on the jack-up platform vessel 1 to recover and temporarily store the drill cuttings and soil.

[0105] Step S605: After the drilling is completed, the rotary drilling rig 8 retracts the drill pipe and lifts the drill bit 9 out of the pile driver 6;

[0106] Step S606: The rotary drilling rig 8 reverses and drives to its original position, and the construction platform 7 is removed.

[0107] In some embodiments, during the drilling process in step S604, the rotary drilling rig 8 lowers the drill bit 9 to contact the mud surface, aligns the center of the hole position through the main mast quadrilateral adjustment system and the traveling system. When drilling, first place the drill bit 9 on the ground, perform a zeroing operation through the zeroing button on the display, and record the original position of the drill bit 9 of the drilling rig. At this time, the display shows the information of the current position of the drilling. The operator can monitor the actual working position of the drilling, the position of each feed, and the hole depth position through the display, so as to operate the drilling operation.

[0108] As Figure 8 shown, in some embodiments, in step S7, it includes the following steps:

[0109] Step S701, adjust the leg 5 of the jack-up platform vessel 1 to lower the height of the jack-up platform vessel 1;

[0110] Specifically, by adjusting the lifting height of the leg 5 of the jack-up platform vessel 1 downward, the pile stabilizing arm 3 will not interfere with the hydraulic hammer 12 sheathing the pile and subsequent pile driving.

[0111] Step S702, lift the hydraulic hammer 12 by the main hook of the jack-up platform vessel 1 and connect the hydraulic hammer 12 to the top of the pile driver 6;

[0112] Step S703, start the hydraulic hammer 12 to drive the pile by hammering; among them, when initially driving the pile, use a small energy to strike. As the foundation pile 2 slowly sinks, gradually increase the hammering energy; during the pile driving process, the surveyors set up surveying equipment on the jack-up platform vessel 1 to measure and review the pile driving verticality and elevation of the foundation pile 2;

[0113] Specifically, when initially driving the pile, use a small energy to strike. As the foundation pile 2 slowly sinks, gradually increase the hammering energy to ensure the penetration of the foundation pile 2 during pile driving; during the pile driving process, the surveyors set up surveying equipment on the jack-up platform to measure and review the pile driving verticality and elevation of the foundation pile 2 to ensure the quality of pile driving by hammering until the foundation pile 2 is driven to the design elevation.

[0114] Step S704, after the pile driving is completed, lift the hydraulic hammer 12 back to the deck of the jack-up platform vessel 1.

[0115] As Figure 9 shown, in some embodiments, in step S8, it includes the following steps:

[0116] Step S801, use the pumping equipment to send the drilled soil in the sedimentation tank 11 into the foundation pile 2 and gradually backfill it to the design position;

[0117] Step S802, after the backfilling is completed, lift the pile driver 6 back to the deck by the jack-up platform vessel 1, and the diver goes into the water to measure the backfilling height of the foundation pile 2 of the already driven pile.

[0118] Specifically, by measuring the backfill height of the foundation pile 2 of the already driven pile through underwater measurement, it is ensured that the foundation pile 2 can meet the original bearing capacity and stability requirements.

[0119] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A method for driving marine pile foundations based on a jack-up platform vessel, characterized in that: It includes the following steps: Step S1, moving the jack-up platform vessel to the foundation pile, so that the pile stabilizing arm on the jack-up platform vessel is located above the foundation pile; Step S2, extending the pile legs of the jack-up platform ship into the water surface and inserting them into the mud surface, so that the jack-up platform ship is lifted up; Step S3, hoisting the pile driver by the jack-up platform ship, and lowering the pile driver above the pile stabilizing arm until the pile driver docks with the foundation pile; Step S5, building a construction platform on the jack-up platform ship so that the construction platform is located above the pile stabilizing arm; Step S6, moving the rotary drilling rig on the jack-up platform ship to the construction platform, and extending the drill bit of the rotary drilling rig into the foundation pile to dig soil; Step S7, hammering and sinking the foundation piles; Step S8: backfill the excavated soil into the foundation piles.

2. The offshore pile driving method for marine piles based on a jack-up platform ship according to claim 1, wherein: The following steps are also included between step S3 and step S5: Step S4: adjusting the pile legs to raise the height of the jack-up platform vessel so that the deck surface of the jack-up platform vessel is higher than the pile top of the pile driver.

3. A method for driving marine pile foundation based on a jack-up platform vessel according to claim 1, characterized in that: In step S1, it includes the following steps: Step S101, initially positioning the jack-up platform vessel according to navigation; Step S102, the center of the pile stabilizing arm on the self-elevating platform vessel is made to coincide with the center of the foundation pile by turning the anchor and moving the vessel; wherein the pile stabilizing arm is installed at the stern of the self-elevating platform vessel.

4. A method for driving marine pile foundations based on a jack-up platform vessel according to claim 1, characterized in that: In step S2, it includes the following steps: Step S201, extending the pile legs of the jack-up platform ship under the water surface and inserting them into the mud surface in the form of diagonal ballasting, so that the jack-up platform ship is lifted up; Step S202: During the jacking process, loosen the anchor cable in time to maintain the overall flatness of the platform.

5. A method for driving marine pile foundation based on a jack-up platform vessel according to claim 1, characterized in that: In step S3, it includes the following steps: Step S301, hang a sling of a pile driver on the main hook of the jack-up platform ship, and connect the pile driver with the pile driver; Step S302, turning the pile driver vertically by using a stopper at the rear of the pile driver; Step S303, hoisting the pile driver to the top of the pile stabilizing arm by rotating the main hook arm of the jack-up platform ship, and then lowering the pile driver; wherein the pile stabilizing arm holds the pile driver when the pile driver is lowered; Step S304: when the pile driver is lowered to a preset distance from the top of the foundation pile, a diver goes into the water to assist in observing the alignment and guide the pile driver to be inserted into the foundation pile; wherein a waterproof sealant is applied to the lower end of the pile driver to form a sealing structure at the contact point between the pile driver and the foundation pile.

6. The offshore pile driving method for marine pile foundation based on a jack-up platform ship according to claim 1, characterized in that: In step S5, it includes the following steps: Step S501, welding a cantilevered construction platform on the stern of the jack-up platform ship, and the construction platform is located above the pile stabilizing arm; Step S502: Laying steel plates on the construction platform.

7. A method for driving marine pile foundations based on a jack-up platform vessel according to claim 1, characterized in that: In step S6, it includes the following steps: Step S601, driving the rotary drilling rig to the construction platform at the stern of the ship, and inserting the drill bit of the rotary drilling rig into the foundation pile; wherein the rotary drilling rig is connected to the drill bit through a drill pipe; Step S602, fix the position of the rotary drilling rig, calibrate the horizontality of the rotary drilling rig by a level ruler, and calibrate the vertical line and the pile position by a plumb line; Step S603: Place the water suction pipe connected to seawater into the pile driver, and continuously inject seawater into the pile driver to keep the water surface in the pile driver at the same height as the top of the pile driver. Step S604: Use the air-lift reverse circulation method to extract the drilling cuttings from the drill pipe. Connect the slag discharge port of the rotary drilling rig with a flexible wear-resistant hose to discharge the drilling cuttings into the sedimentation tank on the jack-up platform vessel. Among them, the operator needs to observe whether the drill pipe is vertical and control the drilling depth through the depth counter until the designed depth is reached. During the recovery of the drilling cuttings, part of the seawater in the sedimentation tank is discharged. Step S605: After the drilling is completed, the rotary drilling rig retracts the drill pipe and lifts the drill bit out of the pile driver. Step S606: The rotary drilling rig retreats and drives to the original position, and the construction platform is demolished.

8. A method for driving marine pile foundations based on a jack-up platform vessel according to claim 1, characterized in that: During the drilling process in Step S604, the rotary drilling rig lowers the drill bit to contact the mud surface. Align the hole position center through the main mast quadrilateral adjustment system and the traveling system. When drilling, first place the drill bit on the ground, and perform the zero-clearing operation through the zero-clearing button on the display to record the original position of the drill bit of the drilling rig. At this time, the display shows the information of the current position of the drilling. The operator can monitor the actual working position, the position of each feed, and the hole depth position of the drilling through the display, so as to operate the drilling operation.

9. A method for driving marine pile foundations based on a jack-up platform vessel according to claim 1, characterized in that: In Step S7, it includes the following steps: Step S701: Adjust the pile legs of the jack-up platform vessel to lower the height of the jack-up platform vessel. Step S702: Use the main hook of the jack-up platform vessel to lift the hydraulic hammer and connect the hydraulic hammer to the top of the pile driver. Step S703: Start the hydraulic hammer to drive the pile by hammering. Among them, at the initial pile driving, use a small energy to strike. As the foundation pile slowly sinks, gradually increase the hammering energy. During the pile driving process, the surveyors set up surveying equipment on the jack-up platform vessel to measure and review the verticality and elevation of the foundation pile during pile driving. Step S704: After the pile driving is completed, lift the hydraulic hammer back to the deck of the jack-up platform vessel.

10. A method for driving marine pile foundations based on a jack-up platform vessel according to claim 7, characterized in that: In Step S8, it includes the following steps: Step S801: Use the pumping equipment to send the drilling cuttings in the sedimentation tank into the foundation pile and gradually backfill to the designed position. Step S802: After the backfilling is completed, use the jack-up platform vessel to lift the pile driver back to the deck. The diver dives into the water to measure the backfill height of the foundation pile where the pile has been driven.

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