A self-elevating offshore auxiliary pile pulling platform and method of use

Abstract

The present application 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 bow and a stern. A pile leg is arranged through the ship body, and a pile shoe is arranged at the bottom of the pile leg. 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, and the counterweight system is arranged in the cabin and comprises rails, flat cars, counterweights and a crane. The pile pulling system comprises a pile pulling platform module, which is connected to the stern through a hydraulic push-pull device. A pile pulling mechanism is arranged on the pile pulling platform module, which performs pile pulling operation on the pile foundation. A pile pulling cooperative control center can collect parameters such as pulling force and pulling speed in real time during the pile pulling process, and can adjust the pulling speed of the auxiliary pile pulling operation to be consistent with the pulling speed of the main offshore self-elevating operation platform, so as to maximize the pile pulling effect while ensuring the safety of the pile pulling platform and the operation platform.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of offshore construction of self-elevating offshore platforms, and particularly relates to a self-elevating offshore auxiliary pile pulling platform and a use method of the self-elevating offshore auxiliary pile pulling platform, which is suitable for the working condition that the self-elevating offshore platform fails to pull out piles and needs to be assisted by other platforms or devices. BACKGROUND

[0002] The self-elevating offshore platform is a kind of offshore platform ship with legs. When in situ operation or sheltering at sea, in order to reduce the sway of the ship body caused by external loads such as wind, wave, tide and current, the legs of the self-elevating offshore platform are lowered to the seabed from the ship body, and the self-elevating offshore platform is raised until it is separated from the sea surface by a certain height. The self-elevating offshore platform is widely used in offshore oil and gas exploitation, seabed geological survey and offshore engineering assembly. However, when the seabed bearing capacity is weak and the seabed soil is viscous after the in situ operation of the self-elevating offshore platform is completed, the pile shoe and pile leg sunk into the seabed to a certain depth are subjected to considerable negative suction and viscous force of the surrounding soil during the recovery process, which makes it difficult to pull out the piles. In extreme cases, the pile shoe cannot be pulled out, which makes the offshore self-elevating platform face the risk of pile cutting. In view of the difficulty in pulling out the piles of the self-elevating offshore platform under complex marine geological conditions, an auxiliary pile pulling platform, supporting pile pulling equipment and intelligent control system need to be developed to realize the safe pulling out of the pile legs of the offshore self-elevating platform and reduce the economic loss caused by pile cutting. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art and provide a self-elevating offshore auxiliary pile pulling platform to realize the safe pulling out of the pile legs of the offshore self-elevating platform and reduce the economic loss caused by pile cutting.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] A self-elevating offshore auxiliary pile pulling platform, comprising a platform ship system, a counterweight system and a pile pulling system, the platform ship system comprising a ship body, a bow and a stern, a pile leg being arranged through the ship body, a pile shoe being arranged at the bottom of the pile leg, a platform posture monitoring device and a pile leg lifting control device being arranged on the ship body, a cabin being arranged in the ship body, the counterweight system being arranged in the cabin and comprising rails, a flat car, counterweights and a crane, the pile pulling system comprising a pile pulling platform module, the pile pulling platform module being connected to the stern through a hydraulic push-pull device, a pile pulling mechanism being arranged on the pile pulling platform module, the pile pulling mechanism pulling out the pile foundation, and a pile pulling cooperative control center being further arranged on the ship body.

[0006] Furthermore, the pile extraction mechanism includes an upper horizontal slide rail and a lower horizontal slide rail on the upper and lower sides of the rear wall of the pile extraction platform module. A left mounting platform and a right mounting platform, which can slide left and right, are mounted on the upper and lower horizontal slide rails. A left vertical gear and a left vertical screw are mounted on the left mounting platform, and a left movable clamp is mounted below the left vertical screw. A right vertical gear and a right vertical screw are mounted on the right mounting platform, and a right movable clamp is mounted below the right vertical screw. The left vertical gear can drive the left vertical screw to move the left movable clamp below it up and down within the left mounting platform. The right vertical gear can drive the right vertical screw to move the right movable clamp below it up and down within the right mounting platform, so that the left and right movable clamps clamp the pile foundation.

[0007] Furthermore, both the left movable clamp and the right movable clamp are equipped with clamp-shaped pads via pad bolts.

[0008] Furthermore, the aforementioned railway tracks are two on the left and right, both longitudinally arranged inside the ship's hold, and the crane can lift the counterweights stacked inside the ship's hold onto the flatbed truck.

[0009] Furthermore, the hydraulic push-pull device includes two hydraulic push-pull rods, with each end of the two hydraulic push-pull rods connected to the stern and the pile extraction platform module, respectively.

[0010] Another objective of this invention is to provide a method for using a self-elevating offshore auxiliary pile-pulling platform.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A method for using a self-elevating offshore auxiliary pile extraction platform includes the following steps:

[0013] S1. Lifting Operation: After the self-elevating offshore auxiliary pile extraction platform is driven to the designated working sea area, under the control of the pile leg lifting control device, the pile legs extend downward through the hull until the pile shoe is inserted into the seabed to a certain depth. At this time, the entire self-elevating offshore auxiliary pile extraction platform is lifted and lifted off the sea surface to a certain height. Estimate the pile extraction force and operate the crane to lift the counterweight stacked in the cabin onto the flatbed truck.

[0014] S2. Pile-adjusting 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 and right movable clamps can clamp the pile to be pulled out by adjusting the spatial position of the upper, lower, left and right.

[0015] S3. Pile clamping operation: Select a suitable clamping pad and fix it inside the left and right movable clamps. Control the left and right installation platforms to slide along the upper and lower horizontal slide rails through the pile extraction coordination control center and clamp the pile foundation.

[0016] S4, pile pulling operation: the pile pulling cooperative control center controls the rotation of the left vertical gear and the right vertical gear inside the left mounting platform and the right mounting platform, controls the left vertical screw and the right vertical screw to drive the left movable clamp and the right movable clamp below them to pull out the clamped pile by a distance;

[0017] S5, pile loosening operation: the pile pulling cooperative control center controls the left mounting platform and the right mounting platform to slide along the upper horizontal slide rail and the lower horizontal slide rail, and loosen the pile foundation;

[0018] S6, lowering clamp operation: control the rotation of the left vertical gear and the right vertical gear inside the left mounting platform and the right mounting platform, control the left vertical screw and the right vertical screw to drive the left movable clamp and the right movable clamp below them to run down a distance, close to the lower part of the pile foundation;

[0019] S7, during the operation of S3, S4, S5, S6, the pile pulling cooperative control center collects the real-time pulling force and pulling speed of the pile foundation, adjusts the pulling speed of the auxiliary pile pulling platform to keep consistent with the pulling speed of the offshore jack-up work platform, and the platform attitude monitoring device controls the flat car carrying a certain counterweight to move back and forth along the rail to realize the force balance of the entire self-elevating offshore auxiliary pile pulling platform ship during pile pulling;

[0020] S8, repeat S3, S4, S5, S6, S7 until the pile foundation is pulled out of the seabed.

[0021] The beneficial effects of the present application are:

[0022] 1) The pile pulling system provided by the present application can collect parameters such as pulling force and pulling speed in real time during pile pulling, and can adjust the pulling speed of the auxiliary pile pulling operation to keep consistent with the pulling speed of the main offshore jack-up work platform, so as to maximize the pile pulling effect while ensuring the safety of the pile pulling platform and the work platform;

[0023] 2) The counterweight system provided by the present application is located in the cabin below the deck waterline, the platform attitude monitoring device can monitor the stress, displacement, inclination, vibration and other parameters of the ship body during the ship sailing and working at sea, and can control the flat car carrying the counterweight to move along the rail, to ensure the force balance and stability of the platform ship during static, sailing and pile pulling;

[0024] 3) The platform ship system provided by the present application is modularly designed, the pile pulling platform module installed at the rear can be detached or replaced by other working modules as needed, which expands the application scenarios of the self-elevating offshore auxiliary pile pulling platform. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1is a front view schematic diagram of the self-elevating offshore auxiliary pile pulling platform of the present application;

[0026] Figure 2 is a top view schematic diagram of the self-elevating offshore auxiliary pile pulling platform of the present application;

[0027] Figure 3 is a vertical view schematic diagram of the counterweight system of the present application;

[0028] Figure 4 is a vertical view schematic diagram of the pile pulling system of the present application;

[0029] Figure 5 is a schematic diagram of the movable clamp of the present application. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the embodiments. The following description of the embodiments is only for the purpose of understanding the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, a number of modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0031] Figure 1 — Figure 5 As shown, the present application relates to a self-elevating offshore auxiliary pile pulling platform, comprising a platform ship system, a counterweight system and a pile pulling system, the platform ship system comprising a ship body 1, a ship bow 2 and a ship stern 3, a pile leg 4 is arranged through the ship body 1, a pile shoe 5 is arranged at the bottom of the pile leg 4, a platform posture monitoring device 6 and a pile leg lifting control device 7 are arranged on the ship body 1, a ship cabin 8 is arranged in the ship body 1, the counterweight system is arranged in the ship cabin 8 and comprises a rail 11, a flat 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 ship stern 3 through a hydraulic push-pull device 21, a pile pulling mechanism is arranged on the pile pulling platform module 22, the pile pulling mechanism performs pile pulling operation on a pile foundation 40, and a pile pulling cooperative control center 33 is further arranged on the ship body 1. The pile leg lifting control device 7 is a conventional technology, such as a gear and rack lifting structure or a hydraulic lifting structure, which drives the pile leg 4 to pass through the ship body 1 and extend downward until the pile shoe 5 is inserted into the seabed to a certain depth. The pile pulling cooperative control center 33 is a control system that monitors the operation of each device of the entire platform ship. Example 1

[0032] Further, the pile pulling mechanism comprises upper and lower horizontal sliding rails 24 and 29 arranged on the upper and lower sides of the rear wall of the pile pulling platform module 22, and left and right mounting platforms 25 and 30 arranged on the upper and lower horizontal sliding rails 24 and 29 and capable of sliding left and right, a left vertical gear 26 and a left vertical screw rod 27 arranged in the left mounting platform 25, a left movable clamp 23 arranged at the lower part of the left vertical screw rod 27, a right vertical gear 31 and a right vertical screw rod 32 arranged in the right mounting platform 30, and a right movable clamp 28 arranged 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 move the left movable clamp 23 at the lower part of the left vertical screw rod 27 up and down in the left mounting platform 25, and the right vertical gear 31 can drive the right vertical screw rod 32 to move the right movable clamp 28 at the lower part of the right vertical screw rod 32 up and down in the right mounting platform 30, so that the left and right movable clamps 23 and 28 clamp the pile foundation 40. The pile pulling cooperative control center 33 is used to control the spatial positions of the left and right movable clamps 23 and 28 in the up-down and left-right directions, so as to clamp the pile foundation 40 to be pulled out at a suitable position. The pile pulling cooperative control center 33 collects real-time pulling force, pulling speed and other parameters of the pile pulling, and adjusts the pulling speed of the auxiliary pile pulling platform to be consistent with the pulling speed of the main offshore self-elevating work platform.

[0033] Further, the left and right movable clamps 23 and 28 are each provided with a clamp special-shaped pad 34 through a pad bolt 35. The clamp special-shaped pad 34 of different sizes and thicknesses can be made according to the shape of the pile foundation 41 to be pulled out, and is fixed to the inner side of the left and right movable clamps 23 and 28 through the pad bolt 35, so as to effectively fit the pile foundation 40.

[0034] Further, the rails 11 are longitudinally arranged in the cabin 8, and the crane 14 can hoist the counterweight 13 stacked in the cabin 8 to the flat car 12. The counterweight 13 can be arranged on the flat car 12 in a balanced or eccentric manner according to the work requirement, and the platform posture monitoring device 6 automatically controls the flat car 12 to move the counterweight 13 along the rails 11 according to the monitoring data, so as to keep the force balance of the platform ship in the process of static, sailing and pile pulling.

[0035] Further, the hydraulic push-pull device 21 comprises two hydraulic push-pull rods, and the two ends of the two hydraulic push-pull rods are respectively connected to the stern 3 and the pile pulling platform module 22. The hydraulic push-pull rods control the included angle between the pile pulling platform module 22 and the stern 3. Embodiment 2

[0036] As another embodiment, the use method of the self-elevating offshore auxiliary pile pulling platform in embodiment 1 comprises the following steps:

[0037] 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 ship body 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 which time the entire self-elevating offshore auxiliary pile pulling platform is lifted and separated from the sea surface 42 by a certain height; the estimated pile pulling force is obtained, and the counterweight 13 stacked in the ship cabin 8 is lifted and transported to the flat car 12 by operating the crane 14;

[0038] S2, pile approaching operation: the hydraulic push-pull rod of the hydraulic push-pull device 21 controls the included angle between the pile pulling platform module 22 and the stern 3, so that the subsequent left movable clamp 23 and right movable clamp 28 can clamp the pile foundation 40 to be pulled out by adjusting the spatial positions of up, down, left and right;

[0039] S3, pile clamping operation: select the appropriate clamp special-shaped pad 34 and fix it on the inner side of the left movable clamp 23 and the right movable clamp 28, 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, and clamp the pile foundation 40 by the pile pulling cooperative control center 33;

[0040] S4, pile pulling operation: the pile pulling cooperative control center 33 controls the rotation of the left vertical gear 26 and the right vertical gear 31 inside the left mounting platform 25 and the right mounting platform 30, and controls the left vertical screw rod 27 and the right vertical screw rod 32 to drive the left movable clamp 23 and the right movable clamp 28 below them to pull out the clamped pile foundation 40 by a distance, which is generally controlled within the effective stroke of the left and right vertical screw rods;

[0041] S5, pile loosening operation: the pile pulling cooperative control center 33 controls 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, and loosen the pile foundation 40;

[0042] S6, pile lowering operation: control the rotation of the left vertical gear 26 and the right vertical gear 31 inside the left mounting platform 25 and the right mounting platform 30, and control the left vertical screw rod 27 and the right vertical screw rod 32 to drive the left movable clamp 23 and the right movable clamp 28 below them to run a distance close to the lower part of the pile foundation 40;

[0043] S7, during the operation of S3, S4, S5, S6, the pile pulling cooperative control center 33 collects real-time pulling force and pulling speed parameters of the pile foundation 40, adjusts the pulling speed of the auxiliary pile pulling platform to keep consistent with the pulling speed of the offshore self-elevating platform, and controls the flat car 12 carrying a certain counterweight 13 to move back and forth along the rail 11 to realize the force balance of the entire self-elevating offshore auxiliary pile pulling platform during the pile pulling process;

[0044] S8, repeat S3, S4, S5, S6, S7 until the pile foundation 40 is pulled out of the seabed 41.

[0045] The above detailed description is used to explain and illustrate the present application, but not to limit the present application, any modification and change made to the present application within the spirit and protection scope of the claims, fall into the protection scope of the present application.

Claims

1. A self-elevating offshore assisted pile extraction platform, characterized in that: The platform ship system includes a ship body (1), a ship bow (2) and a ship stern (3), a pile leg (4) is arranged through the ship body (1), a pile shoe (5) is arranged at the bottom of the pile leg (4), a platform posture monitoring device (6) and a pile leg lifting control device (7) are arranged on the ship body (1), a ship cabin (8) is arranged in the ship body (1), the counterweight system is arranged in the ship cabin (8) and includes rails (11), flat cars (12), counterweights (13) and cranes (14), the pile pulling system includes a pile pulling platform module (22), the pile pulling platform module (22) is connected with the ship stern (3) through a hydraulic push-pull device (21), a pile pulling mechanism is arranged on the pile pulling platform module (22), the pile pulling mechanism pulls the pile foundation (40), a pile pulling cooperative control center (33) is further arranged on the ship body (1), the pile pulling mechanism includes upper horizontal sliding rails (24) and lower horizontal sliding rails (29) arranged on the upper and lower sides of the rear wall of the pile pulling platform module (22), left and right sliding left mounting platforms (25) and right mounting platforms (30) are arranged on the upper horizontal sliding rails (24) and the lower horizontal sliding rails (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), a right vertical gear (31) and a right vertical screw rod (32) are arranged in the right mounting platform (30), a right movable clamp (28) is arranged 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 of the left vertical screw rod (27) 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 of the right vertical screw rod (32) 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).

2. A self-elevating offshore auxiliary pile extraction platform as claimed in claim 1, characterised in that The left movable clamp (23) and the right movable clamp (28) are provided with clamp special-shaped pads (34) through pad bolts (35).

3. A self-elevating offshore auxiliary pile extraction platform as claimed in claim 1, characterised in that The rails (11) are arranged longitudinally in the ship cabin (8), and the crane (14) can hoist the counterweights (13) stacked in the ship cabin (8) to the flat cars (12).

4. A self-elevating offshore auxiliary pile extraction platform as claimed in claim 1, characterised in that The hydraulic push-pull device (21) includes two hydraulic push-pull rods, and the two ends of the two hydraulic push-pull rods are connected with the ship stern (3) and the pile pulling platform module (22) respectively.

5. A method of using a self-elevating offshore pile extraction assist platform according to claim 1, wherein The method includes 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 leg (4) is controlled by the pile leg lifting control device (7) to extend downward through the ship body (1) until the pile shoe (5) is inserted into the seabed to a certain depth, at this time, the whole 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 hoist the counterweights (13) stacked in the ship cabin (8) to the flat cars (12). S2, pile operating: 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 right movable clamp (28) can clamp the pile foundation (40) to be pulled out by adjusting the spatial position of up, down, left and right; S3, clamping pile operation: select the appropriate clamp special-shaped pad (34) and fix it inside the left movable clamp (23) and right movable clamp (28), control the left installation platform (25) and right installation platform (30) to slide along the upper horizontal slide rail (24) and lower horizontal slide rail (29) through the pile pulling cooperative control center (33), and clamp the pile foundation (40); S4, pile pulling operation: the pile pulling cooperative control center (33) controls the left vertical gear (26) and right vertical gear (31) inside the left installation platform (25) and right installation platform (30) to rotate, controls the left vertical screw rod (27) and right vertical screw rod (32) to drive the left movable clamp (23) and right movable clamp (28) below it to pull out the clamped pile foundation (40) by a distance; S5, pile loosening operation: the pile pulling cooperative control center (33) controls the left installation platform (25) and right installation platform (30) to slide along the upper horizontal slide rail (24) and lower horizontal slide rail (29), and loosen the pile foundation (40); S6, lowering clamp operation: control the left vertical gear (26) and right vertical gear (31) inside the left installation platform (25) and right installation platform (30) to rotate, control the left vertical screw rod (27) and right vertical screw rod (32) to drive the left movable clamp (23) and right movable clamp (28) below it to run down a distance, close to the lower part of the pile foundation (40); S7, during the operation of S3, S4, S5, S6, the pile pulling cooperative control center (33) collects the real-time pulling force and pulling speed of the pile foundation (40), adjusts the pulling speed of the auxiliary pile pulling platform to keep consistent with the pulling speed of the offshore jack-up platform, and the platform posture monitoring device (6) controls the flat car (12) carrying a certain counterweight (13) to move back and forth along the rail (11) to realize the force balance of the entire self-elevating offshore auxiliary pile pulling platform ship during pile pulling; S8, repeat S3, S4, S5, S6, S7, until the pile foundation (40) is pulled out of the seabed (41).

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