A self-adaptive combined anti-towing tool for offshore jacket pile leg

Abstract

The application discloses a kind of offshore jacket pile legs self-adapting combined type anti-towing tools, including transverse cutting mechanism and longitudinal cutting mechanism, transverse cutting mechanism includes first base and rotary disc cutter, first base is connected with jacket pile legs, rotary disc cutter is located on first base, first base is equipped with the first trajectory groove of circumference, rotary disc cutter is suitable for rotating along the first trajectory groove circumference;Longitudinal cutting mechanism includes second base and longitudinal cutter, second base is connected with jacket pile legs, longitudinal cutter is located on second base, second base is equipped with multiple vertical second trajectory grooves, longitudinal cutter is suitable for sliding along the second trajectory groove vertically.This application can realize when fishing net or other waste rope is wound around platform pile legs, dynamic full-time cutting is carried out to the object, various corrosion caused by the object to pile legs can be prevented, and the object can be avoided to be wound into ship propeller screw, so that great marine loss risk is caused.

Description

Technical Field

[0001] This invention relates to the field of offshore oil and gas extraction equipment technology, and in particular to an adaptive combined anti-towing tool for offshore jacket legs. Background Technology

[0002] Offshore platform jacket legs are frequently entangled in floating fishing nets or ropes, causing marine damage, mainly manifested in the following aspects: 1) Inducing vortex-induced vibration and fatigue acceleration, Under the influence of ocean currents, such irregular entanglements can generate strong wakes, which can easily induce vortex-induced vibrations. When these vibrations couple with the natural frequency of the pile legs, they can generate huge alternating stresses, which can directly accelerate the fatigue damage of underwater nodes (such as K-type and Y-type pipe nodes) and seriously threaten the overall structural safety of the platform.

[0003] 2) Crevice corrosion and cathodic protection shielding Fishing nets or ropes clinging tightly to the surface of the pile legs form a "shielding layer." This hinders the natural flow of seawater, causing differences in oxygen concentration in the area and creating micro-cells for crevice corrosion. This prevents the protective potential of the entangled area from reaching the standard. Over time, the anti-corrosion coating in this area will peel off more quickly, leading to severe localized pitting corrosion or even perforation of the steel.

[0004] 3) Incomplete cleanup leading to "ineffective operation and maintenance" Due to limitations in diving depth or the mobility of ROVs, manual cleaning is difficult and often only removes debris from splash zones or shallow water areas. In tidal zones and underwater concealed areas, the remaining netting will quickly re-entangle under the influence of water flow, resulting in minimal effectiveness of the initial work.

[0005] 4) Threats to air traffic and emergency rescue Some fishing nets or fishing nets may float on the water with the tide. When the multi-purpose workboat docks or the lifeboat departs, these floating ropes are very likely to get tangled in the ship's propeller, causing the ship to lose control and crash into the platform, resulting in an unacceptable navigational safety accident.

[0006] Therefore, an adaptive combined anti-towing tool for offshore jacket legs has become the key to solving this problem. Summary of the Invention

[0007] The purpose of this invention is to provide an adaptive combined anti-towing tool for offshore jacket legs, which dynamically cuts the mooring object around the clock, ultimately preventing various types of corrosion caused by the mooring object to the legs and avoiding the huge marine damage risk caused by the mooring object getting entangled in the ship's propeller.

[0008] The present invention solves its problems through the following technical solution: An adaptive combined anti-towing tool for offshore jacket foundation legs includes: A transverse cutting mechanism, comprising a first base and a rotary cutter, wherein the first base is connected to the pile leg of the guide frame, the rotary cutter is disposed on the first base, the first base is provided with a circumferential first track groove, and the rotary cutter is adapted to rotate circumferentially along the first track groove; The longitudinal cutting mechanism includes a second base and a longitudinal cutter. The second base is connected to the pile leg of the guide frame. The longitudinal cutter is disposed on the second base. The second base is provided with a plurality of vertical second track grooves. The longitudinal cutter is adapted to slide vertically along the second track grooves.

[0009] Optionally, the first base is a cylindrical axially split structure, which can be disassembled and assembled by studs and nuts, and the outer periphery of the first base is provided with a horizontal transverse annular first track groove.

[0010] Optionally, the rotary cutter includes multiple disc cutters arranged in a ring. Multiple support rods are provided on the inner side of the disc cutters, and a track ball is provided at the end of each support rod. The track ball is located in a first track groove.

[0011] Optionally, the second base is a cylindrical axially split structure, which can be disassembled and assembled using studs and nuts.

[0012] Optionally, the longitudinal cutter includes a columnar handle and a crescent-shaped cutter, with the cutting edge of the crescent-shaped cutter facing outward in a petal-like manner, and the columnar handle vertically inserted into the second trajectory groove.

[0013] Optionally, the crescent-shaped cutter is provided with barbed blades at both the upper and lower ends.

[0014] Optionally, it also includes a third base and a fourth base, which are symmetrically arranged at the upper and lower ends of the second base. The third base and the fourth base are provided with vertical third track grooves, which correspond one-to-one with the second track grooves.

[0015] Optionally, it also includes a spring cover plate and a buffer spring post. The spring cover plate is located at the upper end of the third base and the lower end of the fourth base. The spring cover plate is provided with a spring placement groove corresponding to the third track groove. One end of the buffer spring post is located in the spring placement groove, and the other end of the buffer spring post is embedded in the third track groove.

[0016] Optionally, the circumferential edge of the spring cover plate is provided with a notch corresponding to each spring placement slot as an observation port for the spring cover plate, and the width of the notch is smaller than the diameter of the buffer spring column.

[0017] Optionally, rubber pads are provided between the first base, the second base, and the guide frame legs; multiple anchor points are provided on the first base and the second base, and the anchor points are used to connect the auxiliary recovery rope.

[0018] In summary, the technical effects and advantages of this invention are: this invention can prevent serious structural damage or unacceptable marine losses caused by fishing nets or other discarded ropes becoming entangled in platform legs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an adaptive combined anti-towing tool for offshore jacket legs according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the transverse cutting mechanism according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the longitudinal cutting mechanism according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the second base, spring cover plate, and longitudinal cutter according to an embodiment of the present invention.

[0021] The components are as follows: 1. First base; 2. Rotary cutter; 3. Pile leg; 4. First track groove; 5. Second base; 6. Longitudinal cutter; 7. Second track groove; 8. Support rod; 9. Track ball; 10. Columnar cutter handle; 11. Crescent-shaped cutter; 12. Barbed blade; 13. Third base; 14. Fourth base; 15. Third track groove; 16. Spring cover plate; 17. Buffer spring column; 18. Spring cover plate observation port; 19. Connecting fastening stud nut. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0024] like Figures 1-4 As shown, this embodiment provides an adaptive combined anti-towing tool for offshore jacket foundation legs, including: A transverse cutting mechanism, comprising a first base 1 and a rotary cutter 2, wherein the first base 1 is connected to the guide frame leg 3, the rotary cutter 2 is disposed on the first base 1, the first base 1 is provided with a circumferential first track groove 4, and the rotary cutter 2 is adapted to rotate circumferentially along the first track groove 4; The longitudinal cutting mechanism includes a second base 5 and a longitudinal cutter 6. The second base 5 is connected to the guide frame leg 3. The longitudinal cutter 6 is disposed on the second base 5. The second base 5 is provided with a plurality of vertical second track grooves 7. The longitudinal cutter 6 is adapted to slide vertically along the second track grooves 7.

[0025] In this embodiment, when the floating fishing net or rope gets tangled in the rotary cutter 2, the cutter rotates around the pile leg 3 as an axis under the action of tidal force, further rubbing the rotary cutter 2 back and forth radially against the pile leg 3, thus achieving the passive rope cutting function. When the floating fishing net or rope gets tangled in the longitudinal cutter 6, under the action of tidal force, the longitudinal cutter 6 moves vertically up and down within the second track groove 7, thus achieving the radial passive rope cutting function.

[0026] Specifically, the first base 1 is a cylindrical axially split structure, which is disassembled and assembled by studs and nuts. The outer periphery of the first base 1 is provided with a horizontal transverse annular first track groove 4. The first base 1 serves as a connecting part between the rotary cutter 2 and the pile leg 3, and needs to be locked and fixed to the pile leg 3.

[0027] Specifically, the rotary cutter 2 includes multiple disc cutters arranged in a ring. Multiple support rods 8 are provided on the inner side of each disc cutter, and a track ball 9 is located at the end of each support rod 8 within a first track groove 4. In this embodiment, the rotary cutter 2 is composed of four quarter-disc cutters, with the inner side of each disc cutter welded to the track ball 9 and support rods 8. One end of each support rod 8 is welded to the inner side of the rotary cutter 2, and the other end is welded to and fitted with the track ball 9. The four support rods 8 form a group with an included angle of 22.5° and are welded to the quarter-disc cutters. The movable design of the track ball 9 facilitates installation and flexibility, and also considers the need for replacement of individual cutters damaged in harsh sea conditions, rather than requiring complete replacement, thus saving operating costs. This application does not limit the number of disc cutters, such as 2, 3, or 5, as long as they can form a ring.

[0028] Specifically, the second base 5 is a cylindrical axially split structure, which is assembled and disassembled using studs and nuts. The second base 5 serves as a connector between the longitudinal cutter 6 and the pile leg 3, and needs to be locked and fixed to the pile leg 3.

[0029] Furthermore, the longitudinal cutter 6 includes a columnar handle 10 and a crescent-shaped cutter 11. The cutting edge of the crescent-shaped cutter 11 faces outward and unfolds in a petal-like manner, while the columnar handle 10 is vertically inserted into the second trajectory groove 7. Optionally, the upper and lower ends of the crescent-shaped cutter 11 are respectively provided with barbed blades 12. The cutting edges of the barbed blades 12 face inward, cutting the ropes that are tied or wrapped around them from all directions; once the floating fishing net or rope escapes outward, the barbed blades 12 can still capture it, achieving passive radial cutting again.

[0030] Optionally, the system also includes a third base 13 and a fourth base 14, which are symmetrically arranged at the upper and lower ends of the second base 5. The third base 13 and the fourth base 14 are provided with vertical third track grooves 15, which correspond one-to-one with the second track grooves 7. The length of the third base 13 and the fourth base 14 can be selected according to the size of the tidal surge and the height difference of the splash zone of the pile leg 3. The third base 13 and the fourth base 14 increase the length of the vertical movement trajectory of the longitudinal cutter 6 and also increase the rebound distance of the longitudinal cutter 6, thus extending the life of the cutter.

[0031] Furthermore, it also includes a spring cover plate 16 and a buffer spring post 17. The spring cover plate 16 is located at the upper end of the third base 13 and the lower end of the fourth base 14. The spring cover plate 16 has a spring placement groove corresponding to the third track groove 15. One end of the buffer spring post 17 is located in the spring placement groove, and the other end of the buffer spring post 17 is embedded in the third track groove 15. When the cylindrical handle 10 of the longitudinal cutter 6 moves up and down in the second track groove 7 and the third track groove 15 to the top or end, the buffer spring post 17 can buffer and rebound the cutter in real time, preventing the back-and-forth collision of the cutter from causing the overall structure of the tool to disintegrate.

[0032] Optionally, the circumferential edge of the spring cover plate 16 is provided with notches corresponding to each spring placement slot as observation ports for the spring cover plate 16. The width of the notches is smaller than the diameter of the buffer spring post 17. The observation ports of the spring cover plate 16 facilitate observation of the spring status and whether any springs are missing.

[0033] Optionally, the structural integrity is stabilized by connecting and fastening the studs and nuts 19 through the third base 13, the second base 5, the fourth base 14, and the spring cover plate 16 respectively.

[0034] Furthermore, rubber pads are provided between the first base 1, the second base 5, and the guide frame leg 3; multiple anchor points are provided on the first base 1 and the second base 5, which are used to connect the auxiliary recovery rope. The third base 13 and the fourth base 14 can also be equipped with rubber pads and anchor points. Semi-cylindrical rubber pads are placed between each base and the leg 3 to increase friction and reduce the impact of tides on the device, preventing the bases from loosening; the auxiliary recovery rope and anchor points are welded to the sides of each base at one end, arranged in a mirror-image configuration on all four sides. If marine damage requires detachment, partial structural recovery and replacement can be performed using the ropes.

[0035] The implementation process of this embodiment includes: First, based on the maximum difference in sea state and tide, select the appropriate number of cutter combinations, using a "longitudinal cutter" as the main tool and a "rotary cutter" as the auxiliary tool, with a tool combination of 2 "longitudinal cutters" + 1 "rotary cutter"; Second, install the quarter-circular cutter into the first track grooves of the two halves of the first base in pairs, then merge the two halves of the first base with rubber pads to hug the guide frame leg, and then connect the two halves of the first base with studs and nuts to assemble them into a whole; Third, above and below the rotary cutter assembly, merge the two halves of the second base with rubber pads to hug the guide frame leg, and then connect and tighten the two halves of the second base with studs and nuts to secure them together. The components are assembled as a whole; fourth, according to the actual situation and referring to the installation method of the second base, install the third and fourth bases onto the guide frame legs; fifth, after the two sets of tool combination bases are installed, insert the columnar handle of the longitudinal cutter into the second track groove, and then connect the spring cover plate to the third and fourth bases respectively through fastening bolts; sixth, finally, adjust the posture of the second, third, and fourth bases, and then insert the four large and small connecting fastening studs into the bolt holes of the second base, third base, fourth base, and spring cover plate in sequence to connect and fasten the components into a whole; seventh, pass the auxiliary recovery steel cable through the tool anchor point and tie it above the platform, and the operation is completed.

[0036] In summary, the adaptive combined anti-towing tool for offshore jacket legs can dynamically cut off fishing nets or other abandoned ropes that become entangled in the platform legs at all times. This not only prevents various types of corrosion caused by the entanglement to the legs, but also avoids the huge marine damage risk caused by the entanglement getting tangled in the ship's propeller.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A self-adaptive combined anti-towing tool for offshore jacket foundation legs, characterized in that, include: A transverse cutting mechanism, comprising a first base and a rotary cutter, wherein the first base is connected to the pile leg of the guide frame, the rotary cutter is disposed on the first base, the first base is provided with a circumferential first track groove, and the rotary cutter is adapted to rotate circumferentially along the first track groove; The longitudinal cutting mechanism includes a second base and a longitudinal cutter. The second base is connected to the pile leg of the guide frame. The longitudinal cutter is disposed on the second base. The second base is provided with a plurality of vertical second track grooves. The longitudinal cutter is adapted to slide vertically along the second track grooves.

2. The self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 1, characterized in that, The first base is a cylindrical axially split structure, which can be disassembled and assembled by studs and nuts. The outer periphery of the first base is provided with a horizontal transverse annular first track groove.

3. The self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 1, characterized in that, The rotary cutter includes multiple disc cutters arranged in a ring. Multiple support rods are provided on the inner side of the disc cutters, and a track ball is provided at the end of each support rod. The track ball is located in the first track groove.

4. The self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 1, characterized in that, The second base is a cylindrical axially split structure, which can be disassembled and assembled using studs and nuts.

5. The self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 1, characterized in that, The longitudinal cutter includes a columnar handle and a crescent-shaped cutter. The cutting edge of the crescent-shaped cutter faces outward and unfolds in a petal-like manner. The columnar handle is vertically inserted into the second trajectory groove.

6. The self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 5, characterized in that, The crescent-shaped cutter has barbed blades at both its upper and lower ends.

7. The self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 1, characterized in that, It also includes a third base and a fourth base, which are symmetrically arranged at the upper and lower ends of the second base. The third base and the fourth base are provided with vertical third track grooves, which correspond one-to-one with the second track grooves.

8. The self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 7, characterized in that, It also includes a spring cover plate and a buffer spring post. The spring cover plate is located at the upper end of the third base and the lower end of the fourth base. The spring cover plate has a spring placement groove corresponding to the third track groove. One end of the buffer spring post is located in the spring placement groove, and the other end of the buffer spring post is embedded in the third track groove.

9. A self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 8, characterized in that, The circumferential edge of the spring cover plate has notches corresponding to each spring placement slot as observation ports for the spring cover plate. The width of the notches is smaller than the diameter of the buffer spring column.

10. The self-adaptive combined anti-towing tool for offshore jacket foundation legs according to claim 1, characterized in that, Rubber pads are provided between the first base, the second base, and the guide frame legs; multiple anchor points are provided on the first base and the second base respectively, and the anchor points are used to connect the auxiliary recovery rope.

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