Underwater four-pile foundation guide pin positioning construction method

Abstract

The invention provides an underwater four-pile foundation guide pin positioning construction method. The underwater four-pile foundation guide pin positioning construction method mainly comprises the steps that a crane ship is matched with a positioning system to hoist a guide pin to be arranged on the top side of a foundation pipe pile set; the bottom end of the guide pin is inserted into the top end of a first foundation pipe pile; repeating the steps; the crane ship is matched with the positioning system to hoist the guide frame to the water surface, and is matched with the underwater robot for observation until the top end of each guide pin penetrates through one guide cylinder; after the crane ship hoists the pile feeder to penetrate through a guide cylinder and be inserted into the top end of a second foundation pipe pile, the crane ship hoists a hydraulic hammer to be sleeved with the top end of the pile feeder, and the hydraulic hammer hammers the pile feeder; the other second foundation pipe pile repeats the operation steps of the pile feeder and the hydraulic hammer; and the crane ship also lifts each guide pin to the deck, and the operation steps of the pile feeder and the hydraulic hammer are repeated at the two first foundation pipe piles in sequence. According to the method, the alignment efficiency and the alignment precision are improved, the energy consumption loss is reduced, and the safety risk is reduced, so that the construction efficiency is improved, and the construction cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of construction of a four-pile conductor frame foundation for an offshore wind power project, and in particular to a construction method for positioning guide pins of an underwater four-pile foundation. Background Art

[0002] During the construction of offshore wind power four-pile jacket foundation in deep sea areas, there is a situation of secondary advancement and underwater pile driving. The pile driver is directly hoisted to carry out underwater pile driving, and then the pile driver is hammered to drive the pile. Since the pile driver has no support point after driving the pile, the pile driver pile body shakes greatly, the energy loss is large during the hammering pile driving process, and the safety risk is high. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a construction method for positioning guide pins of an underwater four-pile foundation, which is conducive to improving alignment efficiency, alignment accuracy, reducing energy consumption losses and reducing safety risks, thereby helping to improve construction efficiency and reduce construction costs.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] A construction method for positioning guide pins of underwater four-pile foundations comprises the following steps:

[0006] The crane ship cooperates with the offshore remote GPS pile positioning system to lift a guide pin and place it on the top side of the foundation pipe pile group, the foundation pipe pile group is protruding and fixed on the seabed surface and is located under the water surface, and the foundation pipe pile group includes two first foundation pipe piles and two second foundation pipe piles;

[0007] Lowering an underwater robot or a diver to guide the bottom end of the guide pin to be inserted into the top end of the first foundation pipe pile;

[0008] Repeat the above steps to insert another guide pin into the top end of another first foundation pipe pile;

[0009] The crane ship cooperates with the offshore remote GPS pile sinking positioning system to lift the guide frame and lower it to the water surface. The guide frame includes a main body and four guide cylinders connected to each other. The four guide cylinders are all arranged beside the main body and are spaced apart from the bottom of the main body. The underwater robot is cooperated to observe and continue to lower the guide frame until the top of each guide pin passes through a guide cylinder. The remaining two guide cylinders are arranged one by one with the two second foundation pipe piles.

[0010] After the crane ship lifts the pile driver through the guide cylinder corresponding to the second foundation pipe pile and inserts into the top of the adjacent second foundation pipe pile, the crane ship also lifts the hydraulic hammer and inserts it into the top of the pile driver, and the hydraulic hammer hammers the pile driver so that the verticality and elevation of the second foundation pipe pile meet the construction requirements;

[0011] Repeat the operation steps of the pile driver and the hydraulic hammer on another second foundation pipe pile, so that the verticality and elevation of another second foundation pipe pile also meet the construction requirements;

[0012] After the crane ship hoists the pile driver and the hydraulic hammer back to the deck, it also hoists each of the guide pins to the deck, and then repeats the operation steps of the pile driver and the hydraulic hammer at the two first foundation pipe piles in sequence.

[0013] In some possible implementations, the length of one guide pin is longer than the length of another guide pin, so that after being inserted into the first foundation pipe pile, the top end of the longer guide pin protrudes beyond the top end of the shorter guide pin.

[0014] In some possible embodiments, one end of the guide pin for inserting into the first foundation pipe pile has a first guide portion, and the other end of the guide pin for inserting into the guide frame has a second guide portion, and when observed along the arrangement direction of the first guide portion and the second guide portion, the vertical cross-sections of the first guide portion and the second guide portion are trapezoidal, and the small end of the trapezoid is arranged toward the outside.

[0015] In some possible implementations, the circumferential surface of the guide pin has a limiting convex ring, and the limiting convex ring is arranged relative to the first guide portion to limit the insertion degree of the guide pin in the first foundation pipe pile.

[0016] In some possible implementations, a crawler crane is arranged on the crane vessel, and the step of the crane vessel lifting the guide pin includes:

[0017] The hook of the crawler crane is used to lift one insertion end of the guide pin, and the hook of the crane ship is used to lift the other end of the guide pin. The guide pin is vertically erected by lifting and turning over, and the vertically erected guide pin is lowered to the top side of the foundation pipe pile group.

[0018] In some possible implementations, before the guide pin is lifted for the first time, a crane vessel cooperates with a marine engineering remote GPS pile positioning system to lift the guide frame and place it beside the foundation pile group, and penetrates the bottom end of the main body into the seabed surface;

[0019] After the two first foundation pipe piles are inserted into the guide pin, the crane ship lifts the guide frame out of the water and moves the ship into position, then lifts the guide frame into the water and docks it with the guide pin. During the docking process between the guide frame and the guide pin, the position, orientation and attitude data of the guide frame are observed through the ultra-short baseline positioning system and the three-dimensional attitude meter.

[0020] In some possible implementations, the construction method is performed during low tide, and when the crane vessel is performing lifting operations, the crane vessel is set against the current, with the hull forming an angle of 20° with the direction of the water flow.

[0021] In some possible embodiments, the crane vessel uses a main hook to lift the hydraulic hammer and uses an auxiliary hook to lift the pile driver. After lifting the pile driver to the second foundation pipe pile or the first foundation pipe pile, a total station is used at the top of the main body to measure the pile top elevation and verticality of the second foundation pipe pile or the first foundation pipe pile.

[0022] In some possible implementations, during the process of the hydraulic hammer hammering the pile driver, the total station is also used to measure the verticality of the second foundation pipe pile or the first foundation pipe pile accordingly, and the hammering force of the hydraulic hammer is adjusted according to the penetration degree of the foundation pile and the measured verticality during the hammering process of the hydraulic hammer, so that the corresponding penetration degree and verticality of the second foundation pipe pile or the first foundation pipe pile meet the construction requirements.

[0023] In some possible implementations, two of the first foundation pipe piles and two of the second foundation pipe piles together form a square arrangement, the two of the first foundation pipe piles are arranged diagonally, and the two of the second foundation pipe piles are arranged diagonally.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] In the present application, the coordination of the crane ship, the positioning system, the lowered underwater robot or diver and the guide pins is conducive to improving the alignment efficiency and alignment accuracy of the guide pins, the foundation pipe pile group and the guide frame, thereby helping to improve the construction efficiency. In addition, additional guide pins are used to connect the first foundation pipe pile and the guide frame of the foundation pipe pile group, so that the second foundation pipe pile can provide support when sinking the pile, thereby reducing the shaking of the pile body during the pile sinking process to reduce energy consumption and reduce safety risks, which is also conducive to further improving construction efficiency and reducing construction costs.

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flowchart of a construction method provided in one embodiment of the present application.

[0028] Figure 2 This is a schematic diagram of the layout structure of the crane vessel, offshore remote GPS pile positioning system, guide frame and foundation pipe pile group.

[0029] Figure 3 This is a schematic diagram of the structure of the lifting guide pin of the crane vessel.

[0030] Figure 4Schematic diagram of the structure for inserting the guide pin into the first foundation pile.

[0031] Figure 5 This is a schematic diagram of the structure of the crawler crane hook cooperating with the hook lifting guide pin of the crane vessel.

[0032] Figure 6 Schematic diagram of the structure of the guide pin.

[0033] Figure 7 It is a structural schematic diagram of the guide frame and guide pin socketing process.

[0034] Figure 8 This is a schematic diagram of the structure after the guide frame and guide pin are connected.

[0035] Fig. 9 It is a structural schematic diagram of the process of lifting the pile lifter and hydraulic hammer.

[0036] Fig.10 It is a structural schematic diagram of the hydraulic hammer cooperating with the pile driver to sink the second foundation pipe pile.

[0037] Fig.11 It is a structural schematic diagram of the first foundation pipe pile being sunk by a hydraulic hammer in cooperation with a pile driver.

[0038] Description of Figure Numbers:

[0039] 10-crane vessel; 11-main hook; 12-auxiliary hook; 101-water surface; 100-seabed surface; 20-marine remote GPS pile positioning system; 30-guide pin; 31-first guide part; 32-second guide part; 33-limiting convex ring; 40-foundation pipe pile group; 41-first foundation pipe pile; 42-first foundation pipe pile; 50-guide frame; 51-main body; 52-guide cylinder; 60-underwater robot; 70-pile driver; 71-pile driver; 80-hydraulic hammer; 200-crawler crane hook; X-tidal flow direction; F-dominant wind direction; C-normal wave direction; L-current direction. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can be a centered element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a centered element. When an element is referred to as "arranged on" another element, it can be arranged on the other element or there can be a centered element.

[0042] Reference Figure 1 An embodiment of the present application provides a construction method for positioning guide pins of an underwater four-pile foundation, comprising the following steps.

[0043] Step S101: Refer to Figures 2 to 4 The crane vessel 10 cooperates with the offshore remote GPS pile positioning system 20 to lift a guide pin 30 and place it on the top side of the foundation pipe pile group 40. The foundation pipe pile group 40 protrudes and is fixed on the seabed surface 100 and is located under the water surface 101. The foundation pipe pile group 40 includes two first foundation pipe piles 41 and two second foundation pipe piles 42.

[0044] In some embodiments, before the guide pin 30 is lifted for the first time, the crane vessel 10 cooperates with the offshore remote GPS pile positioning system 20 to lift the guide frame 50 and place it beside the foundation pipe pile group 40. The guide frame 50 includes a main body 51 and four guide cylinders 52 connected to each other. The four guide cylinders 52 are all arranged beside the main body 51 and are spaced apart from the bottom end of the main body 51, and the bottom end of the main body 51 is penetrated into the seabed surface 100. At this time, the guide cylinder 52 can be spaced apart from the seabed surface 100. For example, the guide frame 50 can be penetrated into the seabed surface by its own gravity, or it can be penetrated by lifting a vibrating hammer or a hydraulic hammer. For example, the guide frame 50 can be placed ten meters to the side of the foundation pipe pile group 40. Placing the guide frame 50 in advance can assist in determining the position.

[0045] In some embodiments, before lowering the guide pin 30 for the first time, divers may be arranged to dive to the top of the foundation pipe pile group 40 to check whether there are any obstacles at the pile mouth. The obstacles may include marine organisms or fishing nets. If there are any obstacles, they need to be handled.

[0046] In some embodiments, in conjunction with reference Figure 5 The crane vessel 10 is provided with a crawler crane, and the steps of lifting the guide pin 30 by the crane vessel 10 include:

[0047] The crawler crane hook 200 is used to lift one insertion end of the guide pin 30, and the hook of the crane ship 10 (the auxiliary hook 12 of the crane ship can be used) is used to lift the other insertion end of the guide pin 30, and the guide pin 30 is vertically erected by lifting and turning over, and the vertical guide pin 30 is lowered to the top side of the foundation pipe pile group 40. For example, a mark can be made on the side of the ship, and the guide pin 30 can be adjusted to a predetermined position outside the ship by adjusting the arm angle and rotation position of the crane ship 10. The distance from the guide pin 30 to the outside of the ship can be measured by a distance meter, and then the anchor is turned and the ship is moved. After the guide pin 30 is moved to the top of the corresponding foundation pipe pile of the foundation pipe pile group 40, the guide pin 30 is lowered. Lifting and lowering the guide pin 30 by lifting and turning over is conducive to improving the protection, thereby preventing the guide pin 30 from being damaged by wind during the transfer process.

[0048] In another embodiment, an inserted end of the guide pin 30 may be directly lifted by a hook of the crane vessel 10 for transfer.

[0049] Step S102: Combine with reference Figure 3 , the underwater robot 60 or diver is lowered to guide the bottom end of the guide pin 30 to be inserted into the top of a first foundation pipe pile 41. It is understandable that after the guide pin 30 is inserted into a first foundation pipe pile 41, the diver can go into the water to release the corresponding sling on the guide pin 30. When guided by the underwater robot 60, the guide pin 30 can be pulled by the mechanical arm of the underwater robot 60 to move to the top of the first foundation pipe pile 41 in a directional manner. Or the underwater robot 60 can be loaded with a camera assembly, and the underwater robot 60 follows the guide pin 30 to reach the top position of the first foundation pipe pile 41, and then transmits the captured picture back to the display end, which can be a mobile phone or a computer. The operator adjusts the lowering point of the guide pin 30 according to the picture to insert it into the first foundation pipe pile 41 in a directional manner. Exemplarily, the underwater robot 60 or diver can be lowered at a position 1.5 meters from the top side of the guide pin 30 on the foundation pipe pile group 40.

[0050] Step S103: Combine with reference Figure 4 , repeat steps S101 and S102 to insert another guide pin 30 into the top end of another first foundation pipe pile 41 .

[0051] Step S104: Combine with reference Figure 7 and Figure 8 The crane vessel 10 cooperates with the offshore remote GPS pile positioning system 20 to lift the guide frame 50 and lower it below the water surface, and cooperates with the underwater robot 60 to observe and continue to lower the guide frame 50 until the top of each guide pin 30 passes through a guide tube 52, and the remaining two guide tubes 52 are arranged one by one with the two second foundation pipe piles 42.

[0052] In some embodiments, after both first foundation piles 41 are inserted into the guide pins 30, the crane ship 10 lifts the guide frame 50 out of the water and moves the ship into position, and then the crane ship 10 lifts the guide frame 50 into the water to dock with the guide pins 30. During the docking process between the guide frame 50 and the guide pins 30, the position, orientation and attitude data of the guide frame 50 are observed through the ultra-short baseline positioning system (USBL positioning system) and the three-dimensional attitude meter. The coordinated cooperation of the underwater robot 60, the ultra-short baseline positioning system and the three-dimensional attitude meter is conducive to further ensuring the docking accuracy, thereby improving the construction efficiency and ensuring the construction safety.

[0053] In some embodiments, reference Figure 4 , Figures 7 to 10 The length of one guide pin 30 is longer than the length of the other guide pin 30, so that after the first foundation pipe pile 41 is inserted, the top end of the longer guide pin 30 protrudes from the top end of the shorter guide pin 30, thereby reducing the difficulty of aligning the two guide pins 30 with the guide frame 50, and further helping to improve construction efficiency.

[0054] In some embodiments, in conjunction with reference Figure 6 The guide pin 30 has a first guide portion 31 at one end thereof for inserting into the first foundation pipe pile 41, and has a second guide portion 32 at the other end thereof for inserting into the guide frame 50. When viewed along the arrangement direction of the first guide portion 31 and the second guide portion 32, the vertical cross-sections of the first guide portion 31 and the second guide portion 32 are both trapezoidal, and the small end of the trapezoid is arranged toward the outside. The shape of the guide pin 30 is conducive to improving the convenience of alignment, thereby also being conducive to further improving the efficiency of alignment.

[0055] In some embodiments, the circumferential surface of the guide pin 30 has a limiting convex ring 33, which is arranged relative to the first guide portion 31 to limit the insertion degree of the guide pin 30 in the first foundation pipe pile 41. The provision of the limiting convex ring 33 is conducive to preventing damage to at least one of the first foundation pipe pile 41 and the guide pin 30 due to over-insertion, thereby helping to further reduce the construction risk.

[0056] In some embodiments, reference Figure 2 The two first foundation pipe piles 41 and the two second foundation pipe piles 42 are arranged in a square shape, the two first foundation pipe piles 41 are arranged diagonally, and the two second foundation pipe piles 42 are arranged diagonally. The arrangement of the foundation pipe piles is conducive to further improving the support stability, thereby further reducing the construction shaking, further reducing energy loss and further reducing safety risks.

[0057] In another embodiment, two first foundation pipe piles 41 may be arranged adjacent to each other, and two second foundation pipe piles 42 may also be arranged adjacent to each other. The two first foundation pipe piles 41 and the two second foundation pipe piles 42 may be arranged in other ways, such as linear, square or trapezoidal.

[0058] Step S105: Combine with reference Fig. 9 and Fig.10 After the crane ship 10 lifts the pile driver 70 through a guide tube 52 corresponding to the second foundation pipe pile 42 and inserts it into the top of an adjacent second foundation pipe pile 42, it also lifts the hydraulic hammer 80 and inserts it into the top of the pile driver 70. The hydraulic hammer 80 hammers the pile driver 70 so that the verticality and elevation of the second foundation pipe pile 42 meet the construction requirements.

[0059] In some embodiments, the crane vessel 10 uses the main hook 11 to lift the hydraulic hammer 80 and the auxiliary hook 12 to lift the pile driver 70. After the pile driver 70 is lifted to the second foundation pipe pile 42, a total station is used at the top of the main body 51 to measure the pile top elevation and verticality of the second foundation pipe pile 42. The elevation transfer method can be used for measurement. The lowering position and lowering height of the hydraulic hammer 80 during the process of inserting the pile driver 70 are adjusted according to the measured pile top elevation and verticality. The operation process of the hydraulic hammer 80 is coordinated with the measurement of the pile top elevation and verticality, which is conducive to improving the operation accuracy, thereby further reducing safety risks and reducing hammering energy consumption.

[0060] In some embodiments, the main hook 11 can be used to lift the guide frame 50.

[0061] In some embodiments, during the process of the hydraulic hammer 80 hammering the pile driver 70, a total station is also used to measure the verticality of the second foundation pipe pile 42, and the hammering force of the hydraulic hammer 80 is adjusted according to the penetration degree of the foundation pipe pile and the measured verticality during the hammering process of the hydraulic hammer 80, so that the penetration degree and verticality of the corresponding second foundation pipe pile 42 meet the construction requirements. The use of a total station in the process of the hydraulic hammer 80 hammering the pile driver 70 is also conducive to further improving the operation accuracy, thereby further reducing safety risks and improving construction efficiency.

[0062] Step S106: Repeat the operation steps of the pile driver 70 and the hydraulic hammer 80 at another second foundation pipe pile 42, that is, repeat step S105 at another second foundation pipe pile 42, so that the verticality and elevation of another second foundation pipe pile 42 also meet the construction requirements.

[0063] Step S107: Combine with reference Fig.11After the crane ship 10 hoists each guide pin 30 back to the deck, the operation steps of the pile driver 70 and the hydraulic hammer 80 are repeated at the two first foundation piles 41 in sequence, that is, after the crane ship 10 hoists the pile driver 70 through a guide cylinder 52 corresponding to the first foundation pile 41 and inserts it into the top of an adjacent first foundation pile 41, the hydraulic hammer 80 is also hoisted and inserted into the top of the pile driver 70. The hydraulic hammer 80 hammers the pile driver 70 so that the verticality and elevation of the first foundation pile 41 meet the construction requirements. The operation steps of the pile driver 70 and the hydraulic hammer 80 are repeated at another first foundation pile 41 so that the verticality and elevation of the other first foundation pile 41 also meet the construction requirements.

[0064] In some embodiments, after the pile driver 70 is hoisted to the first foundation pipe pile 41, a total station is used at the top of the main body 51 to measure the pile top elevation and verticality of the first foundation pipe pile 41, and the lowering position and height of the hydraulic hammer 80 during the process of inserting the pile driver 70 are adjusted according to the measured pile top elevation and verticality.

[0065] In some embodiments, during the process of the hydraulic hammer 80 hammering the pile driver 70, a total station is also used to measure the verticality of the first foundation pipe pile 41. The hammering force of the hydraulic hammer 80 is adjusted according to the penetration degree of the first foundation pipe pile 41 and the measured verticality during the hammering process of the hydraulic hammer 80, so that the corresponding penetration degree and verticality of the first foundation pipe pile 41 meet the construction requirements.

[0066] Exemplarily, a pile driver 71 may be used to cooperate with the pile driver 70 .

[0067] In some embodiments, reference Figure 2 The construction method is carried out during the flat tide period. When the crane vessel 10 is lifting, the crane vessel 10 is set against the current, and the hull is 20 degrees from the water flow direction L. This can reduce the environmental impact on the construction efficiency and the damage to the guide pin 30.

[0068] Furthermore, in some embodiments, the crane vessel 10 is staggered with respect to the tidal flow direction X, the dominant wind direction F, the common wave direction C and the water flow direction L.

[0069] In the present application, the coordination of the crane ship 10, the positioning system, the lowered underwater robot 60 or the diver and the guide pin 30 is conducive to improving the alignment efficiency and alignment accuracy of the guide pin 30, the foundation pipe pile group 40 and the guide frame 50, thereby improving the construction efficiency. In addition, the guide pin 30 is additionally used to connect the first foundation pipe pile 41 of the foundation pipe pile group 40 and the guide frame 50, so that the second foundation pipe pile 42 can provide support when sinking the pile, thereby reducing the shaking of the pile body during the pile sinking process to reduce energy consumption and reduce safety risks, which is also conducive to further improving construction efficiency and reducing construction costs.

[0070] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A construction method for positioning guide pins of underwater four-pile foundations, characterized in that: The steps include: The crane ship cooperates with the offshore remote GPS pile positioning system to lift a guide pin and place it on the top side of the foundation pipe pile group, the foundation pipe pile group is protruding and fixed on the seabed surface and is located under the water surface, and the foundation pipe pile group includes two first foundation pipe piles and two second foundation pipe piles; Lowering an underwater robot or a diver to guide the bottom end of the guide pin to be inserted into the top end of the first foundation pipe pile; Repeat the above steps to insert another guide pin into the top end of another first foundation pipe pile; The crane ship cooperates with the offshore remote GPS pile sinking positioning system to lift the guide frame and lower it to the water surface. The guide frame includes a main body and four guide cylinders connected to each other. The four guide cylinders are all arranged beside the main body and are spaced apart from the bottom of the main body. The underwater robot is cooperated to observe and continue to lower the guide frame until the top of each guide pin passes through a guide cylinder. The remaining two guide cylinders are arranged one by one with the two second foundation pipe piles. After the crane ship lifts the pile driver through the guide cylinder corresponding to the second foundation pipe pile and inserts into the top of the adjacent second foundation pipe pile, the crane ship also lifts the hydraulic hammer and inserts it into the top of the pile driver, and the hydraulic hammer hammers the pile driver so that the verticality and elevation of the second foundation pipe pile meet the construction requirements; Repeat the operation steps of the pile driver and the hydraulic hammer on another second foundation pipe pile, so that the verticality and elevation of another second foundation pipe pile also meet the construction requirements; After the crane ship hoists the pile driver and the hydraulic hammer back to the deck, it also hoists each of the guide pins to the deck, and then repeats the operation steps of the pile driver and the hydraulic hammer at the two first foundation pipe piles in sequence.

2. The construction method according to claim 1, characterized in that: The length of one guide pin is longer than the length of the other guide pin, so that after being inserted into the first foundation pipe pile, the top end of the longer guide pin protrudes beyond the top end of the shorter guide pin.

3. The construction method according to claim 2, characterized in that: One end of the guide pin for inserting into the first foundation pipe pile has a first guide portion, and the other end of the guide pin for inserting into the guide frame has a second guide portion. When observed along the arrangement direction of the first guide portion and the second guide portion, the vertical cross-sections of the first guide portion and the second guide portion are trapezoidal, and the small end of the trapezoid is arranged toward the outside.

4. The construction method according to claim 3, characterized in that: The circumferential surface of the guide pin has a limiting convex ring, and the limiting convex ring is arranged relative to the first guide portion to limit the insertion degree of the guide pin in the first foundation pipe pile.

5. The construction method according to claim 1, characterized in that: A crawler crane is arranged on the crane ship, and the steps of the crane ship lifting the guide pin include: The hook of the crawler crane is used to lift one insertion end of the guide pin, and the hook of the crane ship is used to lift the other end of the guide pin. The guide pin is vertically erected by lifting and turning over, and the vertically erected guide pin is lowered to the top side of the foundation pipe pile group.

6. The construction method according to claim 1, characterized in that: Before lifting the guide pin for the first time, the crane vessel cooperates with the offshore remote GPS pile positioning system to lift the guide frame and place it beside the foundation pile group, and penetrate the bottom end of the main body into the seabed surface; After the two first foundation pipe piles are inserted into the guide pin, the crane ship lifts the guide frame out of the water and moves the ship into position, then lifts the guide frame into the water and docks it with the guide pin. During the docking process between the guide frame and the guide pin, the position, orientation and attitude data of the guide frame are observed through the ultra-short baseline positioning system and the three-dimensional attitude meter.

7. The construction method according to claim 1, characterized in that: The construction method is carried out during the flat tide period. When the crane ship is performing lifting operations, the crane ship is set against the flow, and the hull is at 20 degrees to the water flow direction.

8. The construction method according to claim 1, characterized in that: The crane ship uses a main hook to lift the hydraulic hammer and an auxiliary hook to lift the pile driver. After lifting the pile driver to the second foundation pipe pile or the first foundation pipe pile, a total station is used at the top of the main body to measure the pile top elevation and verticality of the second foundation pipe pile or the first foundation pipe pile respectively, and the lowering position and lowering height of the hydraulic hammer in the process of inserting the pile driver are adjusted according to the measured pile top elevation and verticality.

9. The construction method according to claim 8, characterized in that: During the process of the hydraulic hammer striking the pile driver, the total station is also used to measure the verticality of the second foundation pipe pile or the first foundation pipe pile accordingly, and the hammering force of the hydraulic hammer is adjusted according to the penetration degree of the foundation pipe pile and the measured verticality during the hammering process of the hydraulic hammer, so that the corresponding penetration degree and verticality of the second foundation pipe pile or the first foundation pipe pile meet the construction requirements.

10. The construction method according to claim 1, characterized in that: The two first foundation pipe piles and the two second foundation pipe piles together form a square arrangement, the two first foundation pipe piles are arranged diagonally, and the two second foundation pipe piles are arranged diagonally.

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