Self-elevating offshore auxiliary pile pulling platform and using method

Abstract

The invention belongs to the field of offshore construction, and relates to a self-elevating offshore auxiliary pile pulling platform which comprises a platform ship system, a counterweight system and a pile pulling system, the platform ship system comprises a ship body, a ship bow and a ship stern, a pile leg is arranged in the ship body in a penetrating mode, a pile shoe is arranged at the bottom of the pile leg, and a platform posture monitoring device and a pile leg lifting control device are arranged on the ship body; a cabin is arranged in the ship body, the counterweight system is arranged in the cabin and comprises a rail, a flat car, a counterweight and a crane, the pile pulling system comprises a pile pulling platform module, the pile pulling platform module is connected with a stern through a hydraulic push-pull device, a pile pulling mechanism is arranged on the pile pulling platform module, and the pile pulling mechanism performs pile pulling operation on a pile foundation. The pile pulling cooperative control center can collect parameters such as upward pulling force and upward pulling speed in real time in the pile pulling process and can adjust the pile pulling speed of the auxiliary pile pulling operation to be consistent with the pile pulling speed of the main offshore self-elevating working platform, and the safety of the pile pulling platform and the working platform is guaranteed while the pile pulling effect is maximized.

Description

Technical Field

[0001] The present invention belongs to the field of offshore construction of self-elevating marine operating platforms, and specifically relates to a self-elevating offshore auxiliary pile pulling platform and a method for using the self-elevating offshore auxiliary pile pulling platform, which is suitable for the working condition where the self-elevating marine operating platform fails in pile pulling and needs to be assisted by other platforms or equipment in pile pulling. Background Art

[0002] A self-elevating offshore platform is a type of offshore platform ship with built-in limbs. When operating on-site at sea or taking shelter from the wind, in order to reduce the shaking of the hull caused by external loads such as wind, waves, tides, and currents, the limbs of the self-elevating offshore platform are lowered from the hull to the seabed, and the self-elevating offshore platform is raised until it is above a certain height above the sea surface. Self-elevating offshore platforms are now widely used in offshore oil and gas production, seabed geological surveys, marine engineering assembly and other projects. However, after the self-elevating offshore platform is completed on-site, when the seabed bearing capacity is weak and the seabed soil is sticky, the pile shoes and pile legs that are sunk to a certain depth in the seabed are subject to a considerable degree of negative suction and viscosity from the surrounding soil during the process of pulling up and recovering, which makes it difficult to pull out the piles. In extreme cases, the pile shoes cannot be pulled out, which puts the offshore self-elevating platform at risk of cutting piles. In order to solve the problem of pile extraction of self-elevating offshore operating platforms under complex marine geological conditions, it is necessary to develop auxiliary pile extraction platforms, supporting pile extraction equipment and intelligent management and control systems to achieve the safe extraction of the pile legs of offshore self-elevating platforms and reduce the economic losses caused by pile cutting. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a self-elevating offshore auxiliary pile extraction platform to achieve safe extraction of the pile legs of the offshore self-elevating platform and reduce the economic losses caused by pile cutting.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A self-elevating offshore auxiliary pile pulling platform comprises a platform ship system, a counterweight system and a pile pulling system. The platform ship system comprises a hull, a bow and a stern. Pile legs are arranged through the hull, pile shoes are arranged at the bottom of the pile legs, a platform attitude monitoring device and a pile leg lifting control device are arranged on the hull, a cabin is arranged in the hull, the counterweight system is arranged in the cabin, and comprises rails, a flatbed car, a counterweight and a crane. The pile pulling system comprises a pile pulling platform module, the pile pulling platform module is connected to the stern through a hydraulic push-pull device, a pile pulling mechanism is arranged on the pile pulling platform module, and the pile pulling mechanism pulls piles on the pile foundation. A pile pulling coordination control center is also arranged on the hull.

[0005] Furthermore, the pile pulling mechanism includes an upper horizontal slide rail and a lower horizontal slide rail respectively arranged on the upper and lower sides of the rear wall of the pile pulling platform module, a left mounting platform and a right mounting platform which can slide left and right are arranged on the upper and lower horizontal slide rails, a left vertical gear and a left vertical screw are arranged in the left mounting platform, a left movable clamp is arranged at the lower part of the left vertical screw, a right vertical gear and a right vertical screw are arranged in the right mounting platform, a right movable clamp is arranged at the lower part of the right vertical screw, the left vertical gear can drive the left vertical screw to drive the left movable clamp at its lower part to move up and down in the left mounting platform, and the right vertical gear can drive the right vertical screw to drive the right movable clamp at its lower part to move up and down in the right mounting platform, so that the left movable clamp and the right movable clamp clamp the pile foundation.

[0006] Furthermore, the left movable clamp and the right movable clamp are both provided with clamp special-shaped pads through pad bolts.

[0007] Furthermore, there are two left and right rails, both of which are longitudinally arranged in the cabin, and the crane can lift the counterweight stacked in the cabin to the flatbed truck.

[0008] Furthermore, the hydraulic push-pull device includes two left and right hydraulic push-pull rods, and two ends of the left and right hydraulic push-pull rods are respectively connected to the stern and the pile pulling platform module.

[0009] Another object of the present invention is to provide a method for using a self-elevating offshore auxiliary pile extraction platform.

[0010] To achieve the above object, the present invention adopts the following technical solutions: A method for using a self-elevating offshore auxiliary pile extraction platform comprises the following steps: S1. Ship lifting operation: After the self-elevating offshore auxiliary pile pulling platform is driven to the predetermined working sea area, the pile legs are extended downward through the hull under the control of the pile leg lifting control device until the pile shoes are inserted into the seabed to a certain depth. At this time, the entire self-elevating offshore auxiliary pile pulling platform is lifted and separated from the sea surface to a certain height; the pile pulling force is estimated, and the crane is operated to lift the counterweights stacked in the cabin onto the flatbed truck; S2. Pile-to-pile operation: The hydraulic push-pull rod of the hydraulic push-pull device controls the angle between the pile-pulling platform module and the stern, so that the subsequent left movable clamp and the right movable clamp can clamp the pile foundation to be pulled out by adjusting the upper, lower, left and right spatial positions; S3, pile clamping operation: select a suitable clamp special-shaped pad and fix it on the inner side of the left movable clamp and the right movable clamp, and control the left installation platform and the right installation platform to slide along the upper horizontal slide rail and the lower horizontal slide rail through the pile pulling coordination control center, and clamp the pile foundation; S4, pile pulling operation: the pile pulling coordination control center controls the rotation of the left vertical gear and the right vertical gear inside the left installation platform and the right installation platform, and controls the left vertical screw and the right vertical screw to drive the left movable clamp and the right movable clamp at the lower part thereof to pull the clamped pile upward for a distance; S5, pile loosening operation: the pile pulling coordination control center controls the left installation platform and the right installation platform to slide along the upper horizontal slide rail and the lower horizontal slide rail to loosen the pile foundation; S6, clamp lowering operation: control the left vertical gear and the right vertical gear inside the left installation platform and the right installation platform to rotate, control the left vertical screw and the right vertical screw to drive the left movable clamp and the right movable clamp at the lower part thereof to move downward for a distance, close to the lower part of the pile foundation; S7. During the operation of S3, S4, S5 and S6, the pile pulling collaborative control center collects the real-time pulling force and pulling speed of the pile foundation, adjusts the pile pulling speed of the auxiliary pile pulling platform to be consistent with the pile pulling speed of the offshore jack-up platform, and the platform attitude monitoring device controls the flatbed car carrying a certain counterweight to move forward and backward along the rails to achieve force balance of the entire offshore jack-up auxiliary pile pulling platform during the pile pulling process; S8. Repeat S3, S4, S5, S6 and S7 until the pile foundation is pulled out from the seabed.

[0011] The beneficial effects of the present invention are: 1) The pile pulling system provided by the present invention has a pile pulling collaborative control center that can collect parameters such as pulling force and pulling speed in real time during the pile pulling process, and can adjust the pile pulling speed of the auxiliary pile pulling operation to be consistent with the pile pulling speed of the main offshore jack-up operating platform, thereby maximizing the pile pulling effect while ensuring the safety of the pile pulling platform and the operating platform; 2) The counterweight system provided by the present invention is located in the cabin below the deck waterline. Its platform attitude monitoring device can monitor the force, displacement, tilt, vibration and other parameters of the entire platform ship when it is sailing and operating at sea, and can control the flatbed truck carrying the counterweight to move along the rails to ensure the force balance and stability of the platform ship during stationary, sailing and pile pulling; 3) The platform ship system provided by the present invention is of modular design, and the pile pulling platform module installed at the rear can be disassembled or replaced with other working modules as needed, thereby expanding the application scenarios of the self-elevating offshore auxiliary pile pulling platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a front view schematic diagram of the self-elevating offshore auxiliary pile extraction platform of the present invention; Figure 2 1. It is a schematic top view of the self-elevating offshore auxiliary pile extraction platform of the present invention; Figure 3 is a schematic elevation view of the counterweight system of the present invention; Figure 4 is a schematic elevation view of the pile pulling system of the present invention; Figure 5 It is a schematic diagram of a movable clamp of the present invention. DETAILED DESCRIPTION

[0013] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0014] Figure 1 — Figure 5 As shown, the present invention relates to a self-elevating offshore auxiliary pile pulling platform, including a platform ship system, a counterweight system and a pile pulling system. The platform ship system includes a hull 1, a bow 2 and a stern 3. A pile leg 4 is arranged through the hull 1, a pile shoe 5 is arranged at the bottom of the pile leg 4, a platform attitude monitoring device 6 and a pile leg lifting control device 7 are arranged on the hull 1, a cabin 8 is arranged in the hull 1, and the counterweight system is arranged in the cabin 8, including a rail 11, a flatbed car 12, a counterweight 13 and a crane 14. The pile pulling system includes a pile pulling platform module 22, the pile pulling platform module 22 is connected to the stern 3 through a hydraulic push-pull device 21, a pile pulling mechanism is arranged on the pile pulling platform module 22, and the pile pulling mechanism performs a pile pulling operation on the pile foundation 40. A pile pulling coordination control center 33 is also arranged on the hull 1. The pile leg lifting control device 7 is an existing conventional technology, such as a gear rack lifting structure or a hydraulic lifting structure, which drives the pile leg 4 to extend downward through the hull 1 until the pile shoe 5 is inserted into a certain depth of the seabed. The pile pulling coordination control center 33 is a control system that monitors the operation of each device of the entire platform ship. Example 1

[0015] Furthermore, the pile pulling mechanism includes an upper horizontal slide rail 24 and a lower horizontal slide rail 29 respectively arranged on the upper and lower sides of the rear wall of the pile pulling platform module 22, a left mounting platform 25 and a right mounting platform 30 which can slide left and right are arranged on the upper horizontal slide rail 24 and the lower horizontal slide rail 29, a left vertical gear 26 and a left vertical screw 27 are arranged in the left mounting platform 25, a left movable clamp 23 is arranged at the lower part of the left vertical screw 27, and a right vertical gear 30 is arranged in the right mounting platform 30. 1 and a right vertical screw 32, a right movable clamp 28 is arranged at the lower part of the right vertical screw 32, the left vertical gear 26 can drive the left vertical screw 27 to drive the left movable clamp 23 at its lower part to move up and down in the left installation platform 25, the right vertical gear 31 can drive the right vertical screw 32 to drive the right movable clamp 28 at its lower part to move up and down in the right installation platform 30, so that the left movable clamp 23 and the right movable clamp 28 clamp the pile foundation 40. The pile pulling collaborative control center 33 is used to control the upper, lower, left and right spatial positions of the left movable clamp 23 and the right movable clamp 28 to clamp the pile foundation 40 to be pulled out at a suitable position, and the pile pulling collaborative control center 33 collects the real-time pulling force, pulling speed and other parameters of the pile pulling, and adjusts the pile pulling speed of the pile pulling operation of the auxiliary pile pulling platform to be consistent with the pile pulling speed of the main offshore jack-up operation platform.

[0016] Furthermore, the left movable clamp 23 and the right movable clamp 28 are both provided with clamp shaped pads 34 through pad bolts 35. The clamp shaped pads 34 of different sizes and thicknesses can be manufactured according to the shape of the pile foundation 41 to be pulled out, and the clamp shaped pads 34 are fixed to the inner side of the left movable clamp 23 and the right movable clamp 28 through the pad bolts 35 to effectively fit with the pile foundation 40.

[0017] Furthermore, the rails 11 have two rails 11 on the left and right sides, both of which are longitudinally arranged in the cabin 8, and the crane 14 can lift the counterweight 13 stacked in the cabin 8 to the flatbed car 12. The counterweight 13 can be evenly arranged on the flatbed car 12 or eccentrically arranged on the left and right sides according to work needs. The platform attitude monitoring device 6 automatically controls the flatbed car 12 to carry the counterweight 13 and move forward and backward along the rails 11 according to its monitoring data, so as to maintain the force balance of the platform ship during stationary, sailing and pile pulling.

[0018] Furthermore, the hydraulic push-pull device 21 includes two left and right hydraulic push-pull rods, both ends of which are respectively connected to the stern 3 and the pile pulling platform module 22 , and the hydraulic push-pull rods control the angle between the pile pulling platform module 22 and the stern 3 . Example 2

[0019] As another embodiment, a method for using a self-elevating offshore auxiliary pile extraction platform in Embodiment 1 comprises the following steps: S1, ship lifting operation: after the self-elevating offshore auxiliary pile pulling platform is driven to the predetermined working sea area, under the control of the pile leg lifting control device 7, the pile legs 4 extend downward through the hull 1 until the pile shoes 5 are inserted into the seabed to a certain depth, at which time the entire self-elevating offshore auxiliary pile pulling platform is lifted and separated from the sea surface 42 to a certain height; the pile pulling force is estimated, and the crane 14 is operated to lift the counterweight 13 stacked in the cabin 8 onto the flatbed truck 12; S2, pile-pull operation: the hydraulic push-pull rod of the hydraulic push-pull device 21 controls the angle between the pile-pulling platform module 22 and the stern 3, so that the subsequent left movable clamp 23 and the right movable clamp 28 can clamp the pile foundation 40 to be pulled out by adjusting the upper, lower, left and right spatial positions; S3, pile clamping operation: select a suitable clamp shaped pad 34 and fix it to the inner side of the left movable clamp 23 and the right movable clamp 28, and control the left installation platform 25 and the right installation platform 30 to slide along the upper horizontal slide rail 24 and the lower horizontal slide rail 29 through the pile pulling coordination control center 33, and clamp the pile foundation 40; S4, pile pulling operation: the pile pulling coordination control center 33 controls the left vertical gear 26 and the right vertical gear 31 inside the left installation platform 25 and the right installation platform 30 to rotate, and controls the left vertical screw 27 and the right vertical screw 32 to drive the left movable clamp 23 and the right movable clamp 28 at the lower part thereof to pull the clamped pile foundation 40 upward for a distance, and this distance is generally controlled within the effective stroke of the left and right vertical screws; S5, pile loosening operation: the pile pulling coordination control center 33 controls the left installation platform 25 and the right installation platform 30 to slide along the upper horizontal slide rail 24 and the lower horizontal slide rail 29 to loosen the pile foundation 40; S6, clamp lowering operation: controlling the left vertical gear 26 and the right vertical gear 31 inside the left mounting platform 25 and the right mounting platform 30 to rotate, controlling the left vertical screw 27 and the right vertical screw 32 to drive the left movable clamp 23 and the right movable clamp 28 at the lower part thereof to move downward for a distance, close to the lower part of the pile foundation 40; S7. During the operation of S3, S4, S5 and S6, the pile pulling collaborative control center 33 collects the real-time pulling force and pulling speed of the pile foundation 40, adjusts the pile pulling speed of the auxiliary pile pulling platform to be consistent with the pile pulling speed of the offshore jack-up platform, and the platform attitude monitoring device 6 controls the flatbed car 12 carrying a certain counterweight 13 to move forward and backward along the rail 11 to achieve the force balance of the entire offshore jack-up auxiliary pile pulling platform during the pile pulling process; S8. Repeat S3, S4, S5, S6, and S7 until the pile foundation 40 is pulled out from the seabed 41.

[0020] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A self-elevating offshore auxiliary pile extraction platform, characterized in that: The invention comprises a platform ship system, a counterweight system and a pile pulling system. The platform ship system comprises a hull (1), a bow (2) and a stern (3). Pile legs (4) are arranged through the hull (1). Pile shoes (5) are arranged at the bottom of the pile legs (4). A platform attitude monitoring device (6) and a pile leg lifting control device (7) are arranged on the hull (1). A cabin (8) is arranged in the hull (1). The counterweight system is arranged in the cabin (8) and comprises a rail (11), a flatbed car (12), a counterweight (13) and a crane (14). The pile pulling system comprises a pile pulling platform module (22). The pile pulling platform module (22) is connected to the stern (3) via a hydraulic push-pull device (21). A pile pulling mechanism is arranged on the pile pulling platform module (22). The pile pulling mechanism pulls piles from the pile foundation (40). A pile pulling coordination control center (33) is also arranged on the hull (1).

2. A self-elevating offshore auxiliary pile extraction platform as claimed in claim 1, characterized in that The pile pulling mechanism comprises an upper horizontal slide rail (24) and a lower horizontal slide rail (29) respectively arranged on the upper and lower sides of the rear wall of the pile pulling platform module (22); a left mounting platform (25) and a right mounting platform (30) which can slide left and right are arranged on the upper horizontal slide rail (24) and the lower horizontal slide rail (29); a left vertical gear (26) and a left vertical screw rod (27) are arranged in the left mounting platform (25); a left movable clamp (23) is arranged at the lower part of the left vertical screw rod (27); and a right vertical gear (31) and a right vertical screw rod (31) are arranged in the right mounting platform (30). A right vertical screw rod (32) is provided at the lower part of the right vertical screw rod (32). The left vertical gear (26) can drive the left vertical screw rod (27) to drive the left movable clamp (23) at the lower part thereof to move up and down in the left mounting platform (25). The right vertical gear (31) can drive the right vertical screw rod (32) to drive the right movable clamp (28) at the lower part thereof to move up and down in the right mounting platform (30), so that the left movable clamp (23) and the right movable clamp (28) clamp the pile foundation (40).

3. A self-elevating offshore auxiliary pile extraction platform as claimed in claim 2, characterized in that The left movable clamp (23) and the right movable clamp (28) are both provided with clamp special-shaped cushion blocks (34) via cushion block bolts (35).

4. A self-elevating offshore auxiliary pile extraction platform as claimed in claim 1, characterized in that The rails (11) are provided in two left and right directions, both of which are longitudinally arranged in the cabin (8). The crane (14) can lift the counterweight (13) stacked in the cabin (8) onto the flatbed car (12).

5. The self-elevating offshore auxiliary pile extraction platform according to claim 1, characterized in that The hydraulic push-pull device (21) comprises two left and right hydraulic push-pull rods, and two ends of the left and right hydraulic push-pull rods are respectively connected to the stern (3) and the pile pulling platform module (22).

6. A method for using a self-elevating offshore auxiliary pile extraction platform, characterized in that The following steps are involved: S1. Ship lifting operation: After the self-elevating offshore auxiliary pile pulling platform is driven to the predetermined working sea area, the pile legs (4) are extended downward through the hull (1) under the control of the pile leg lifting control device (7) until the pile shoes (5) are inserted into the seabed to a certain depth. At this time, the entire self-elevating offshore auxiliary pile pulling platform is lifted and separated from the sea surface (42) to a certain height; the pile pulling force is estimated, and the crane (14) is operated to lift the counterweight (13) stacked in the cabin (8) onto the flatbed truck (12); S2, pile-pull operation: the hydraulic push-pull rod of the hydraulic push-pull device (21) controls the angle between the pile-pulling platform module (22) and the stern (3), so that the subsequent left movable clamp (23) and the right movable clamp (28) can clamp the pile foundation (40) to be pulled out by adjusting the upper, lower, left and right spatial positions; S3, pile clamping operation: select a suitable clamping special-shaped pad (34) and fix it to the inner side of the left movable clamp (23) and the right movable clamp (28), and control the left mounting platform (25) and the right mounting platform (30) to slide along the upper horizontal slide rail (24) and the lower horizontal slide rail (29) through the pile pulling coordination control center (33), and clamp the pile foundation (40); S4, pile pulling operation: the pile pulling coordination control center (33) controls the left vertical gear (26) and the right vertical gear (31) inside the left installation platform (25) and the right installation platform (30) to rotate, and controls the left vertical screw (27) and the right vertical screw (32) to drive the left movable clamp (23) and the right movable clamp (28) at the lower part thereof to pull the clamped pile foundation (40) upward for a certain distance; S5, pile loosening operation: the pile pulling coordination control center (33) controls the left installation platform (25) and the right installation platform (30) to slide along the upper horizontal slide rail (24) and the lower horizontal slide rail (29) to loosen the pile foundation (40); S6, clamp lowering operation: controlling the left vertical gear (26) and the right vertical gear (31) inside the left mounting platform (25) and the right mounting platform (30) to rotate, controlling the left vertical screw (27) and the right vertical screw (32) to drive the left movable clamp (23) and the right movable clamp (28) below them to move downward for a distance, close to the lower part of the pile foundation (40); S7. During the operation of S3, S4, S5, and S6, the pile pulling collaborative control center (33) collects the real-time pulling force and pulling speed of the pile foundation (40), adjusts the pile pulling speed of the auxiliary pile pulling platform to be consistent with the pile pulling speed of the offshore jack-up platform, and the platform attitude monitoring device (6) controls the flatbed vehicle (12) carrying a certain counterweight (13) to move forward and backward along the rail (11) to achieve force balance of the entire offshore jack-up auxiliary pile pulling platform during the pile pulling process; S8. Repeat S3, S4, S5, S6, and S7 until the pile foundation (40) is pulled out from the seabed (41).

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