Underwater four-pile foundation single-pile positioning construction method

Abstract

The invention provides an underwater four-pile foundation single-pile positioning construction method which comprises the steps that a crane ship lifts a guide frame to the position below the water surface through a maritime work remote GPS pile sinking positioning system so that the guide frame can be located on the top side of a foundation pile, and the guide frame comprises a platform, four connecting pile pipes and a guide cylinder; the lowering underwater robot observes the alignment condition of the lowered guide cylinder and the lowered foundation pile; the lifting vibratory hammer vibrates and sinks the four auxiliary piles penetrating through the connecting pile pipes into the seabed surface in sequence, and the auxiliary piles are connected with the guide frame; the hoisting pile feeder is inserted into a guide cylinder to abut against a foundation pile; hoisting a hydraulic hammer to be sleeved in the pile feeder, and hammering the pile feeder by using the hydraulic hammer to sink the foundation pile; hoisting the pile feeder and the hydraulic hammer back by the crane ship; and the crane ship transfers the guide frame to the next pile position to repeat the steps. According to the construction method, the safety risk is reduced, the construction difficulty is reduced, the construction duration is shortened, and the construction economic loss 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 a single pile of an underwater four-pile foundation. Background Art

[0002] The four-pile jacket foundation for offshore wind power is a common foundation form in China. The offshore environment is harsh and difficult to predict, and the foundation piles are subject to secondary advancement and pile sinking during construction. The gap between the positioning frame guide tube and the foundation piles is small, and the foundation piles are located under the water surface. It is difficult for the guide frame to reposition the four foundation piles in their original positions. In addition, it is affected by natural factors such as waves and surges, resulting in high construction risks, and difficult to control construction efficiency and costs. 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 single pile positioning of underwater four-pile foundation which reduces safety risks, construction difficulty, construction time and construction economic losses.

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

[0005] A construction method for positioning a single pile of an underwater four-pile foundation comprises the following steps:

[0006] The crane ship hoists the guide frame to the bottom of the water through the offshore remote GPS pile sinking positioning system so as to be located on the top side of a foundation pile. The guide frame includes a platform, four connecting pile pipes and a guide cylinder. Every two opposite connecting pile pipes are axially symmetrically arranged and both pass through the opposite sides of the platform. At least one connecting pile pipe is connected to a guide cylinder on its side, and the guide cylinder is arranged at intervals from the bottom end of the connecting pile pipe.

[0007] Lowering the underwater robot to observe the alignment of the lowered guide tube and the foundation pile, and after the alignment is completed, continue to lower the guide frame until the connecting pile pipe is located on the seabed;

[0008] The crane ship hoists a vibrating hammer to sequentially vibrate and sink four auxiliary piles, each of which passes through a connecting pile pipe, into the seabed surface, and connect the auxiliary piles and the guide frame;

[0009] The pile driver hoisted by the crane ship is inserted into one of the guide cylinders from the side away from the seabed surface to abut against one of the foundation piles;

[0010] The crane ship hoists a hydraulic hammer and inserts it into the pile driver from the side away from the seabed surface, and uses the hydraulic hammer to hammer the pile driver to sink the foundation pile;

[0011] After the crane ship hoists back the pile driver and the hydraulic hammer, and releases the connection between the auxiliary pile and the guide frame, the crane ship hoists a vibrating hammer to loosen each auxiliary pile, and fixes the loosened auxiliary pile to the guide frame with a latch;

[0012] The guide frame of the crane ship is moved to the next pile position to repeat the above steps, thereby completing the sinking of the next foundation pile.

[0013] In some possible implementations, the guide cylinder includes a first cylinder portion and a second cylinder portion that are connected to each other, the second cylinder portion is arranged closer to the bottom end of the connecting pile pipe relative to the first cylinder portion, and when observed relative to the platform, the vertical cross-section of the second cylinder portion is a truncated conical structure, and the large mouth end of the second cylinder portion is arranged relative to the bottom end of the connecting pile pipe.

[0014] In some possible implementations, the first barrel portion includes a first portion and a second portion, the second portion is connected between the first portion and the second barrel portion, and when observed relative to the platform, the vertical cross-section of the first portion is a truncated conical structure, and the large end of the first portion is arranged relative to the top end of the connecting pile pipe.

[0015] In some possible implementations, the guide frame is initially connected to the auxiliary pile so that the two are lowered together under the water surface, and the step of vibrating and sinking the auxiliary pile into the seabed surface further includes:

[0016] After the lifting fixture of the crane ship clamps one of the auxiliary piles, the connection between the clamped auxiliary pile and the guide frame is released, so that the disconnected auxiliary pile sinks naturally, and then the vibrating hammer is used to vibrate the sunken auxiliary pile.

[0017] In some possible implementations, the crane vessel uses a main hook to lift the hydraulic hammer, and the crane vessel uses an auxiliary hook to lift the pile driver.

[0018] In some possible implementations, the process of lowering the guide frame below the water surface includes:

[0019] The crane ship uses a main hook to connect four slings to lift the guide frame, and one end of each sling away from the main hook is connected to a connection point on the platform, and each connection point is located on a side of the connection pile pipe facing the symmetry axis;

[0020] After the guide cylinder and the foundation pile are aligned and connected, the operator transfers to the platform to release the sling at the connection point;

[0021] The crane ship uses a main hook to connect the four lifting belts to lift the guide frame and move it to the next pile position.

[0022] In some possible implementations, in the step of vibrating and sinking the auxiliary piles into the seabed, four auxiliary piles are symmetrically vibrated and sunk, and an operator constantly monitors the flatness of the platform.

[0023] In some possible implementations, the further step includes: setting up a total station on the platform to measure the penetration degree of the foundation piles and the verticality of the pile body.

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

[0025] In this application, the positioning accuracy between the guide frame and the foundation pile is ensured through the coordination of the marine engineering remote GPS pile positioning system and the underwater robot, reducing the safety risks during the construction process. In addition, the method of positioning the construction of a single foundation pile avoids the problem of high difficulty and long time consumption caused by the need to position multiple foundation piles simultaneously. In addition, it is also beneficial to avoid the problem of construction damage caused by interference between multiple foundation piles. Therefore, the construction method provided by this application is beneficial to reducing safety risks, reducing construction difficulty, reducing construction time and reducing construction economic losses.

[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 A schematic structural diagram of a crane vessel, a marine remote GPS pile positioning system, a guide frame and foundation piles provided in one embodiment of the present application.

[0029] Figure 3 for Figure 2 Schematic diagram of the installation of the guide frame and auxiliary piles shown.

[0030] Figure 4 This is a schematic diagram of the structure after the crane ship's lifting guide frame and foundation piles are aligned.

[0031] Figure 5 This is a schematic diagram of the structure of the crane ship lifting pile driver and hydraulic hammer operation.

[0032] Description of Figure Numbers:

[0033] 10-crane vessel; 11-main hook; 12-auxiliary hook; 13-sling; 20-marine remote GPS pile positioning system; 30-guide frame; 31-platform; 32-connecting pile pipe; 33-guide cylinder; 331-first cylinder section; 3311-first section; 3312-second section; 332-second cylinder section; 40-foundation pile; 50-auxiliary pile; 60-pile driver; 70-hydraulic hammer; 100-seabed surface; 110-water surface. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] Reference Figure 1 An embodiment of the present application provides a construction method for positioning a single pile of an underwater four-pile foundation, comprising the following steps.

[0037] Step S101: Refer to Figures 2 to 4 , the crane vessel 10 lifts the guide frame 30 to the bottom of the water through the offshore remote GPS pile sinking positioning system 20 so as to be located on the top side of a foundation pile 40. The guide frame 30 includes a platform 31, four connecting pile pipes 32 and a guide cylinder 33. Each two opposite connecting pile pipes 32 are axially symmetrically arranged and pass through the opposite sides of the platform 31 (i.e., the four connecting pile pipes 32 can be arranged in a square or quasi-square shape). For example, the connecting pile pipe 32 and the platform 31 can be fixed by welding, and a guide cylinder 33 is connected to the side of at least one connecting pile pipe 32. The guide cylinder 33 is arranged at intervals from the bottom end of the connecting pile pipe 32. In this embodiment, the guide frame 30 includes two guide cylinders 33, one guide cylinder 33 is connected to a connecting pile pipe 32, and the other guide cylinder 33 is connected to another adjacent connecting pile pipe 32. The remaining two connecting pile pipes 32 can be connected with guide members, which can be cylindrical structures. For example, the guide cylinder 33 can be connected to the connecting pile pipe 32 by welding, hoop fixing or integral molding. Exemplarily, multiple offshore remote GPS pile positioning systems 20 (six offshore remote GPS pile positioning systems 20 are shown in the figure) may be used for positioning. It is understood that the crane vessel 10 includes a crane boom structure.

[0038] In some embodiments, the guide frame 30 is initially connected to four auxiliary piles 50, so that the two are lowered together under the water surface, and each of the four auxiliary piles 50 passes through a connecting pile tube 32. Exemplarily, the auxiliary piles 50 can be connected to the guide frame 30 by welding, locking, or snapping. The guide frame 30 is initially connected to the auxiliary piles 50, which can avoid the subsequent docking of the auxiliary piles 50 under the water surface to reduce the difficulty of installation.

[0039] In some embodiments, the process of lowering the guide frame 30 below the water surface 110 includes:

[0040] The crane vessel 10 uses a main hook 11 to connect four slings 13 to lift the guide frame 30. One end of each sling 13 away from the main hook 11 is connected to a connection point on the platform 31, and each connection point is placed on a side of a connection pile pipe 32 facing the symmetry axis. Exemplarily, the structure of the connection point may include a connection ring or a connection buckle or a hook. The position of the connection point and the matching selection of the sling 13 are conducive to improving the movement stability of the guide frame 30.

[0041] In some embodiments, reference Figure 3 The guide cylinder 33 includes a first cylinder portion 331 and a second cylinder portion 332 which are connected to each other. The second cylinder portion 332 is arranged closer to the bottom end of the connecting pile pipe 32 than the first cylinder portion 331. When observed relative to the platform 31, the vertical section of the second cylinder portion 332 is a truncated cone structure, and the large end of the second cylinder portion 332 is arranged relative to the bottom end of the connecting pile pipe 32. The shape of the second cylinder portion 332 facilitates the foundation pile 40 to be inserted into the guide cylinder 33, thereby improving the positioning efficiency of the guide frame 30.

[0042] In some embodiments, the structure of the guide member may be the same as that of the first barrel portion 331 .

[0043] In some embodiments, the first barrel portion 331 includes a first portion 3311 and a second portion 3312, the second portion 3312 is connected between the first portion 3311 and the second barrel portion 332, and the vertical section of the first portion 3311 is a truncated cone structure when viewed relative to the platform 31, and the large end of the first portion 3311 is arranged relative to the top end of the connecting pile pipe 32. Similarly, the structure of the first barrel portion 331 is also conducive to improving the insertion efficiency of the guide frame 30.

[0044] Step S102: Lowering an underwater robot to observe the alignment of a lowered guide cylinder 33 and a foundation pile 40. After the alignment is completed (i.e., the foundation pile 40 is inserted into the guide cylinder 33), the guide frame 30 is further lowered until the connecting pile pipe 32 is located on the seabed surface 100. Exemplarily, when the guide cylinder 33 is 10m away from the top of the foundation pile 40, the underwater robot is lowered to observe the alignment. The underwater robot can be loaded with a camera assembly, so that the alignment image of the guide cylinder 33 and the foundation pile 40 can be fed back to the display end. Exemplarily, the display end can include a PC end, a tablet computer or a mobile phone.

[0045] In some embodiments, after the guide cylinder 33 and the foundation pile 40 are aligned and sleeved, the operator transfers to the platform 31 to release the sling 13 at the connection point.

[0046] Step S103: The crane vessel 10 hoists a vibrating hammer to sequentially vibrate and sink four auxiliary piles 50, each of which passes through a connecting pile pipe 32, into the seabed surface 100, and connect the auxiliary piles 50 and the guide frame 30. For example, a code plate can be welded between the auxiliary piles 50 and the platform 31 of the guide frame 30 to achieve the connection between the two. For example, a scale is provided on the outer surface of the auxiliary pile 50, so as to facilitate the observation of the penetration of the auxiliary pile 50.

[0047] In some embodiments, the step of vibrating and sinking the auxiliary pile 50 into the seabed surface 100 further includes: after the crane vessel 10 lifts the clamp to clamp an auxiliary pile 50, the connection between the clamped auxiliary pile 50 and the guide frame 30 is released, so that the disconnected auxiliary pile 50 sinks naturally, and then a vibrating hammer is used to vibrate the sunken auxiliary pile 50. Exemplarily, the lowering speed of the clamp can be controlled so that the disconnected auxiliary pile 50 can sink naturally.

[0048] In some embodiments, in the step of vibrating and sinking the auxiliary piles 50 into the seabed 100, four auxiliary piles 50 are symmetrically vibrated and sunk, and the operator constantly monitors the flatness of the platform 31 to avoid the guide frame 30 from tilting and causing damage to the foundation pile 40 or the guide cylinder 33, thereby further reducing construction risks and construction costs.

[0049] Step S104: Refer to Figure 5 The crane vessel 10 lifts the pile driver 60 and inserts it into a guide tube 33 from the side away from the seabed surface 100 to abut against a foundation pile 40.

[0050] For example, the outer surface of the pile driver 60 may be provided with scales, so as to facilitate intuitive judgment of the penetration depth of the foundation pile 40 .

[0051] Step S105: The crane vessel 10 lifts the hydraulic hammer 70 and inserts it into the pile driver 60 from the side away from the seabed surface 100, and uses the hydraulic hammer 70 to hammer the pile driver 60 to sink the foundation pile 40, thereby completing the pile sinking step of the single foundation pile 40. For example, a hammering force with a relatively small energy may be used first, and then the operator timely adjusts the subsequent striking energy according to the penetration condition of the foundation pile 40.

[0052] In some embodiments, the crane vessel 10 uses the main hook 11 to lift the hydraulic hammer 70, and the crane vessel 10 uses the auxiliary hook 12 to lift the pile driver 60. Specifically, after the crane vessel 10 uses the auxiliary hook 12 to lift the pile driver 60, the crane vessel 10 adjusts the boom angle, lowers the main hook 12 to the deck of the crane vessel 10 to lift the hydraulic hammer 70, and then lifts the hydraulic hammer 70 to the top side of the pile driver 60 for hammering. The main hook 11 and the auxiliary hook 12 cooperate to lift the hydraulic hammer 70 and the pile driver 60, which is conducive to reducing the process of repeated disassembly and assembly, thereby improving the work efficiency and convenience.

[0053] In some embodiments, a total station is set up on the platform 31 to measure the penetration degree of the foundation piles 40 and the verticality of the pile body, so that the pile sinking conditions of the foundation piles 40 can be monitored to ensure the construction quality.

[0054] Step S106: After the crane vessel 10 lifts the pile return device 60 and the hydraulic hammer 70 and releases the connection between the auxiliary pile 50 and the guide frame 30, it lifts a vibrating hammer to loosen each auxiliary pile 50 and fixes the loosened auxiliary pile 50 to the guide frame 30 with a latch.

[0055] Step S107 : the crane vessel 10 moves the guide frame 30 to the next pile position to repeat the above steps, thereby completing the sinking of the next foundation pile 40 .

[0056] In some embodiments, the crane vessel 10 uses the main hook 11 to connect the four lifting belts 13 to lift the guide frame 30 and move it to the next pile position.

[0057] In the present application, the positioning accuracy between the guide frame 30 and the foundation pile 40 is ensured through the coordination of the offshore remote GPS pile positioning system 20 and the underwater robot, thereby reducing the safety risk during the construction process. In addition, the method of positioning the construction of a single foundation pile 40 avoids the problem of high difficulty and long time consumption caused by the need to position multiple foundation piles 40 simultaneously. In addition, it is also helpful to avoid the problem of construction damage caused by interference between multiple foundation piles 40. Therefore, the construction method provided by the present application is helpful to reduce safety risks, construction difficulty, construction time and construction economic losses.

[0058] 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 a single pile of an underwater four-pile foundation, characterized in that: The steps include: The crane ship hoists the guide frame to the bottom of the water through the offshore remote GPS pile sinking positioning system so as to be located on the top side of a foundation pile. The guide frame includes a platform, four connecting pile pipes and a guide cylinder. Every two opposite connecting pile pipes are axially symmetrically arranged and both pass through the opposite sides of the platform. At least one connecting pile pipe is connected to a guide cylinder on its side, and the guide cylinder is arranged at intervals from the bottom end of the connecting pile pipe. Lowering the underwater robot to observe the alignment of the lowered guide tube and the foundation pile, and after the alignment is completed, continue to lower the guide frame until the connecting pile pipe is located on the seabed; The crane ship hoists a vibrating hammer to sequentially vibrate and sink four auxiliary piles, each of which passes through a connecting pile pipe, into the seabed surface, and connect the auxiliary piles and the guide frame; The pile driver hoisted by the crane ship is inserted into one of the guide cylinders from the side away from the seabed surface to abut against one of the foundation piles; The crane ship hoists a hydraulic hammer and inserts it into the pile driver from the side away from the seabed surface, and uses the hydraulic hammer to hammer the pile driver to sink the foundation pile; After the crane ship hoists back the pile driver and the hydraulic hammer, and releases the connection between the auxiliary pile and the guide frame, the crane ship hoists a vibrating hammer to loosen each auxiliary pile, and fixes the loosened auxiliary pile to the guide frame with a latch; The crane ship moves the guide frame to the next pile position to repeat the above steps, thereby completing the sinking of the next foundation pile.

2. The construction method according to claim 1, characterized in that: The guide cylinder includes a first cylinder portion and a second cylinder portion that are connected to each other. The second cylinder portion is arranged closer to the bottom end of the connecting pile pipe than the first cylinder portion. When observed relative to the platform, the vertical section of the second cylinder portion is a truncated cone structure, and the large mouth end of the second cylinder portion is arranged relative to the bottom end of the connecting pile pipe.

3. The construction method according to claim 1, characterized in that: The first barrel portion includes a first portion and a second portion, the second portion is connected between the first portion and the second barrel portion, and the vertical section of the first portion is a truncated cone structure when viewed relative to the platform, and the large end of the first portion is arranged relative to the top end of the connecting pile pipe.

4. The construction method according to claim 1, characterized in that: The guide frame is initially connected to the auxiliary pile so that the two are lowered together under the water surface, and the step of vibrating and sinking the auxiliary pile into the seabed surface also includes: After the lifting fixture of the crane ship clamps one of the auxiliary piles, the connection between the clamped auxiliary pile and the guide frame is released, so that the disconnected auxiliary pile sinks naturally, and then the vibrating hammer is used to vibrate the sunken auxiliary pile.

5. The construction method according to claim 1, characterized in that: The crane ship uses a main hook to lift the hydraulic hammer, and the crane ship uses an auxiliary hook to lift the pile driver.

6. The construction method according to claim 5, characterized in that: The process of lowering the guide frame below the water surface includes: The crane ship uses a main hook to connect four slings to lift the guide frame, and one end of each sling away from the main hook is connected to a connection point on the platform, and each connection point is located on a side of the connection pile pipe facing the symmetry axis; After the guide cylinder and the foundation pile are aligned and connected, the operator transfers to the platform to release the sling at the connection point; The crane ship uses a main hook to connect the four lifting belts to lift the guide frame and move it to the next pile position.

7. The construction method according to claim 1, characterized in that: In the step of vibrating and sinking the auxiliary piles into the seabed, four auxiliary piles are symmetrically vibrated and sunk, and the operator monitors the flatness of the platform at all times.

8. The construction method according to claim 1, characterized in that: Also includes: A total station is set up on the platform to measure the penetration degree of the foundation piles and the verticality of the pile body.

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