Steel structure connecting piece for jack-up offshore workover rig

Abstract

The present application relates to the technical field of self-elevating offshore workover platform, and discloses a steel structure connecting piece for self-elevating offshore workover platform, which comprises a workover platform cross beam plate, both ends of the workover platform cross beam plate are provided with workover platform vertical beam plates, the workover platform vertical beam plates are fixedly connected with workover platform connecting steel plates on the side close to the workover platform cross beam plate, the outer surface of the workover platform connecting steel plate is provided with a connecting hole, the connecting hole is provided with a bolt inside, and the end of the bolt is provided with a nut; and a hollow cylinder is rotationally connected to the side of the workover platform connecting steel plate away from the workover platform cross beam plate. The steel structure connecting piece can effectively solve the problem that the number of bolts is large in the prior art, the worker uses a wrench to tighten a single bolt, then tightens the next bolt, the number of tightening times is large, the work is relatively complicated, the tightening efficiency of the bolt is low, and the construction efficiency is reduced.

Description

Technical Field

[0001] This invention relates to the field of jack-up marine well workover platform technology, and more specifically to steel structure connectors for jack-up marine well workover platforms. Background Technology

[0002] Steel structure connectors are key components used to connect various components (such as steel beams and columns) in a steel structure, ensuring the integrity and stability of the structure. During construction, appropriate steel plate thickness and width are selected based on the size and load-bearing requirements of the beams and slabs. The connecting steel plates are then cut and drilled, placed at the beam-slab connection points, ensuring a tight fit between the steel plate and the beam-slab surface. Bolts are then passed through the steel plate and beam-slab, and nuts are rotated to form a unified structure that shares the load, thereby improving the stability of the building structure.

[0003] A jack-up offshore well workover platform is a mobile offshore work platform. The main body of the platform is usually made of steel and provides operating space for personnel and equipment. During the reinforcement process of this platform, high-strength bolts are used to connect the beams and steel plates with pre-tightening force, and the prefabricated steel plates are spliced ​​together with the beams. This allows for the splicing and reinforcement of the beams and the connecting steel plates of the well workover platform even in harsh sea conditions.

[0004] Currently, during the splicing and reinforcement of the steel plates connecting the beams and the well repair platform, multiple bolts are usually symmetrically distributed along the edge of the steel plate connecting the well repair platform. The symmetrical distribution of bolts ensures that the steel plate is subjected to uniform stress and avoids local stress concentration in the steel plate connecting the well repair platform. However, due to the large number of bolts, workers need to use a wrench to tighten each bolt before tightening the next bolt. This requires many tightening operations, making the work tedious and inefficient, thus reducing construction efficiency. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a steel structure connector for a self-elevating marine well workover platform, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides steel structure connectors for jack-up offshore well workover platforms, comprising:

[0008] The well repair platform has a horizontal beam plate, and both ends of the horizontal beam plate are provided with vertical beam plates. Each vertical beam plate is fixedly connected to a connecting steel plate on the side of the vertical beam plate near the horizontal beam plate. The outer surface of the connecting steel plate is provided with a connecting hole, and a bolt is provided inside the connecting hole. One end of the bolt is provided with a nut.

[0009] A hollow cylinder, one end of which is rotatably connected to the side of the well repair platform connecting steel plate away from the well repair platform crossbeam plate, a gear is slidably connected to the outer circumference of the hollow cylinder, an inner octagonal cylinder is rotatably connected to the side of the well repair platform connecting steel plate away from the well repair platform crossbeam plate, an octagonal slider is slidably connected to the inner wall of the inner octagonal cylinder, and a nut is fixedly connected to the inner wall of the octagonal slider;

[0010] The inner octagonal cylinders are arranged in eight symmetrically distributed on the outer surface of the connecting steel plate of the well repair platform. The outer circumference of the four inner octagonal cylinders located on the upper and lower sides is fixedly connected to the rear gear, and the outer circumference of the four inner octagonal cylinders located in the middle is fixedly connected to the front gear. The first gear is externally meshed with the front gear.

[0011] Furthermore, the hollow cylinder has four sliding holes arranged in a circular array on its outer circumference. The inner wall of the first gear is fixedly connected to a sliding block, and the first gear is slidably connected to the sliding hole via the sliding block.

[0012] Furthermore, an internal gear ring is fixedly connected to one end of the hollow cylinder near the connecting steel plate of the well workover platform. The hollow cylinder is rotatably connected to the connecting steel plate of the well workover platform through the internal gear ring. Gear No. 2, Gear No. 3, and Gear No. 4 are rotatably connected to the side of the connecting steel plate of the well workover platform away from the crossbeam plate of the well workover platform. The axis of Gear No. 4 is collinear with the axis of the hollow cylinder. Gear No. 2 is internally meshed with the internal gear ring. Gear No. 2 is externally meshed with Gear No. 3. Gear No. 3 is externally meshed with Gear No. 4.

[0013] Furthermore, a central shaft is fixedly connected to the side of the fourth gear away from the connecting steel plate of the well repair platform. Two ring frames are fixedly connected to the outer circumference of the central shaft, and an adjusting cylinder is fixedly connected to the outer circumference of the two ring frames together.

[0014] Furthermore, the outer circumferential surface of the adjusting cylinder is provided with a front flat rail, a spiral rail and a rear flat rail, one end of the spiral rail is fixedly connected to the front flat rail and the other end of the spiral rail is fixedly connected to the rear flat rail.

[0015] Furthermore, the two sliding blocks located in the middle are rotatably connected to adjusting wheels on their adjacent sides, and the two adjusting wheels are slidably connected inside the front flat rail;

[0016] During the sliding connection between the adjusting wheel and the front flat rail, the first gear meshes with the front gear; during the sliding connection between the adjusting wheel and the rear flat rail, the first gear meshes with the rear gear.

[0017] Furthermore, a hexagonal drive block is fixedly connected to the end of the hollow cylinder away from the connecting steel plate of the well repair platform.

[0018] The technical solution provided by this invention has the following advantages compared with the prior art:

[0019] 1. The working environment of self-elevating marine well workover platforms is harsh, and the steel plate joints are easily corroded by seawater, leading to rust and breakage. This invention uses a socket wrench to rotate two hexagonal drive blocks on the front side of the steel plate joints of the workover platform to complete the following: first, tighten the four bolts in the middle, and then tighten the four bolts on the top and bottom sides. The tightening sequence of the bolts is from the center of the bolt group outwards, which allows the preload of the bolts to be evenly distributed from the center to the outside. This even distribution method can ensure that the preload of each bolt is relatively balanced, ensuring the sealing and reliability of the connection, reducing the degree of seawater corrosion at the steel plate joints, and extending the service life of each connecting component.

[0020] 2. Tightening bolts from the center outwards can gradually disperse stress, making the stress distribution more even throughout the connection area. Multiple bolts can be tightened in a single operation with a socket wrench, thereby reducing the total number of bolt tightening operations. The bolt tightening work is simple and convenient, improving bolt tightening efficiency and thus improving the construction efficiency of the self-elevating marine well workover platform. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the crossbeam plate of the well repair platform according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the hexagonal driving block according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the connecting steel plate of the well workover platform according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the empty cylinder in an embodiment of the present invention;

[0027] Figure 6This is a schematic diagram of the sliding block structure according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the ring frame structure according to an embodiment of the present invention;

[0029] Figure 8 This is a front view schematic diagram of gear No. 4 in Embodiment 4 of the present invention;

[0030] Figure 9 This is a schematic diagram of the front flat rail structure according to an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the front gear in an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the octagonal slider in an embodiment of the present invention.

[0033] The labels in the diagram represent: 1. Well workover platform crossbeam plate; 11. Well workover platform vertical beam plate; 12. Well workover platform connecting steel plate; 121. Connecting hole; 13. Bolt; 14. Nut; 2. Hollow cylinder; 21. Hexagonal drive block; 22. Gear No. 1; 23. Inner octagonal cylinder; 24. Octagonal slider; 25. Front gear; 26. Rear gear; 3. Sliding block; 31. Sliding hole; 4. Internal gear ring; 41. Gear No. 2; 42. Gear No. 3; 43. Gear No. 4; 44. Central shaft; 45. Ring frame; 46. Adjusting cylinder; 461. Front flat rail; 462. Spiral rail; 463. Rear flat rail; 5. Adjusting wheel. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] The present invention will be further described below with reference to embodiments.

[0036] Example: Please refer to Figures 1-11 This invention provides a technical solution: a steel structure connector for a jack-up offshore well workover platform, comprising:

[0037] The well repair platform has a horizontal beam plate 1 and vertical beam plates 11 at both ends. A connecting steel plate 12 is fixedly connected to the side of the vertical beam plate 11 near the horizontal beam plate 1. A connecting hole 121 is provided on the outer surface of the connecting steel plate 12. A bolt 13 is provided inside the connecting hole 121, and a nut 14 is provided at one end of the bolt 13.

[0038] Hollow cylinder 2, one end of hollow cylinder 2 is rotatably connected to the side of well repair platform connecting steel plate 12 away from well repair platform crossbeam plate 1, a first gear 22 is slidably connected to the outer circumference of hollow cylinder 2, an inner octagonal cylinder 23 is rotatably connected to the side of well repair platform connecting steel plate 12 away from well repair platform crossbeam plate 1, an octagonal slider 24 is slidably connected to the inner wall of inner octagonal cylinder 23, and a nut 14 is fixedly connected to the inner wall of octagonal slider 24;

[0039] Among them, eight inner octagonal cylinders 23 are provided and symmetrically distributed on the outer surface of the connecting steel plate 12 of the well repair platform. The outer circumference of the four inner octagonal cylinders 23 located on the upper and lower sides is fixedly connected to the rear gear 26, and the outer circumference of the four inner octagonal cylinders 23 located in the middle is fixedly connected to the front gear 25. The first gear 22 is externally meshed with the front gear 25.

[0040] The hollow cylinder 2 has four sliding holes 31 on its outer circumference. The sliding holes 31 are arranged in a circular array on the outer circumference of the hollow cylinder 2. The inner wall of the first gear 22 is fixedly connected to a sliding block 3. The sliding block 3 is arranged in a circular array on the inner wall of the first gear 22. The first gear 22 is slidably connected to the sliding hole 31 through the sliding block 3.

[0041] An internal gear ring 4 is fixedly connected to one end of the hollow cylinder 2 near the connecting steel plate 12 of the well repair platform. The hollow cylinder 2 is rotatably connected to the connecting steel plate 12 of the well repair platform through the internal gear ring 4. On the side of the connecting steel plate 12 of the well repair platform away from the crossbeam plate 1 of the well repair platform, gears No. 2 41, No. 3 42 and No. 4 43 are rotatably connected respectively. The axis of gear No. 43 is collinear with the axis of the hollow cylinder 2. Gear No. 2 41 is internally meshed with the internal gear ring 4, gear No. 2 41 is externally meshed with gear No. 3 42, and gear No. 3 42 is externally meshed with gear No. 4 43.

[0042] A central shaft 44 is fixedly connected to the side of the No. 4 gear 43 away from the well repair platform connecting steel plate 12. Two ring frames 45 are fixedly connected to the outer circumference of the central shaft 44. An adjusting cylinder 46 is fixedly connected to the outer circumference of the two ring frames 45.

[0043] The outer circumference of the adjusting cylinder 46 is provided with a front flat rail 461, a spiral rail 462 and a rear flat rail 463 respectively. One end of the spiral rail 462 is fixedly connected to the front flat rail 461, and the other end of the spiral rail 462 is fixedly connected to the rear flat rail 463.

[0044] Two sliding blocks 3 located in the middle are rotatably connected to adjusting wheels 5 on their adjacent sides, and both adjusting wheels 5 are slidably connected inside the front flat rail 461.

[0045] During the sliding connection between the adjusting wheel 5 and the front flat rail 461, the first gear 22 meshes with the front gear 25. During the sliding connection between the adjusting wheel 5 and the rear flat rail 463, the first gear 22 meshes with the rear gear 26.

[0046] A hexagonal drive block 21 is fixedly connected to one end of the hollow cylinder 2 away from the well repair platform and the connecting steel plate 12.

[0047] Working principle:

[0048] The connection process between the well workover platform connecting steel plate 12 and the well workover platform vertical beam plate 11:

[0049] In practical applications, the connecting steel plate 12 of the well workover platform is welded to one side of the vertical beam plate 11 of the well workover platform using welding equipment. The welding equipment is used along the inner fillet weld of the connecting steel plate 12 and the vertical beam plate 11 of the well workover platform, and a segmented back-welding method is adopted (each segment is 300 mm-500 mm long) to reduce unilateral heat deformation. After the inner side is welded, the position of the connecting steel plate 12 and the vertical beam plate 11 of the well workover platform is adjusted. The welding equipment is used along the outer fillet weld of the connecting steel plate 12 and the vertical beam plate 11 of the well workover platform. The welds on both sides need to be welded symmetrically (e.g., two layers are welded on the inner side, and two corresponding layers are welded on the outer side). Symmetrical force is achieved by welding on both sides, reducing stress concentration.

[0050] Pre-connection process between the well workover platform connecting steel plate 12 and the well workover platform crossbeam plate 1:

[0051] In practical applications, by inserting the bolts 13 into the connecting holes 121 from the side of the well repair platform crossbeam plate 1 away from the well repair platform connecting steel plate 12, the eight bolts 13 pass through the corresponding holes on the well repair platform crossbeam plate 1 and the well repair platform connecting steel plate 12 in sequence, ensuring that the bolts 13 pass through vertically without any skewing.

[0052] The connection process between the well workover platform connecting steel plate 12 and the well workover platform crossbeam plate 1:

[0053] In practical applications, by using a socket wrench on the outer surface of the two hexagonal drive blocks 21, and by activating the socket wrench, as... Figure 10 As shown, the socket wrench drives two hexagonal drive blocks 21 to rotate counterclockwise, which in turn drives two hollow cylinders 2 to rotate counterclockwise around their own axes. Each of the two hollow cylinders 2 drives its internal gear ring 4 at one end to rotate counterclockwise on the outer surface of the connecting steel plate 12 of the well-work platform. Figure 8As shown, under the internal meshing connection between the internal gear ring 4 and the second gear 41, the rotating internal gear ring 4 drives the three second gears 41 to rotate counterclockwise on the outer surface of the well repair platform connecting steel plate 12. Under the external meshing connection between the second gear 41 and the third gear 42, the three counterclockwise rotating second gears 41 drive the three third gears 42 to rotate clockwise on the outer surface of the well repair platform connecting steel plate 12. Under the external meshing connection between the third gear 42 and the fourth gear 43, the three clockwise rotating third gears 42 drive the fourth gear 43 to rotate counterclockwise on the outer surface of the well repair platform connecting steel plate 12. The fourth gear 43 drives the central shaft 44 at its center to rotate counterclockwise around its own axis. The central shaft 44 drives the two ring frames 45 on its outer circumference to rotate counterclockwise around its own axis. The two ring frames 45 drive the adjusting cylinder 46 on its outer circumference to rotate counterclockwise around its own axis.

[0054] As a further embodiment of the present invention, since the number of teeth on the internal gear ring 4 is greater than the number of teeth on the fourth gear 43, the rotational speed of the internal gear ring 4 is less than the rotational speed of the fourth gear 43. Therefore, with the internal gear ring 4 as a reference, the fourth gear 43 rotates counterclockwise relative to the internal gear ring 4. Similarly, the adjusting cylinder 46 rotates counterclockwise relative to the hollow cylinder 2. Figure 9 As shown, initially, the adjusting wheel 5 slides along the front flat rail 461 and moves closer to the spiral rail 462. Then, the adjusting wheel 5 slides along the spiral rail 462 and moves closer to the rear flat rail 463. Then, the adjusting wheel 5 slides along the rear flat rail 463.

[0055] As a further embodiment of the present invention, during the counterclockwise rotation of the hollow cylinder 2 on one side of the connecting steel plate 12 of the well repair platform, initially, the hollow cylinder 2 drives four sliding blocks 3 to rotate counterclockwise around the axis of the hollow cylinder 2 through four sliding holes 31 on its outer circumference. The four sliding blocks 3 drive the first gear 22 to rotate counterclockwise around the axis of the hollow cylinder 2. Under the sliding connection between the adjusting wheel 5 and the front flat rail 461, the four sliding blocks 3 and the first gear 22 are limited (the first gear 22 and the sliding blocks 3 will not slide along the sliding holes 31), so that... The first gear 22 is always located in the front half of the outer circumference of the hollow cylinder 2. The first gear 22 is always externally meshed with the two front gears 25. Under the action of the external meshing connection between the first gear 22 and the front gears 25, the counterclockwise rotating first gear 22 drives the two front gears 25 to rotate clockwise around the axis of the inner octagonal cylinder 23. The clockwise rotating front gears 25 drive the four inner octagonal cylinders 23 located in the middle to rotate clockwise around their own axes. The four inner octagonal cylinders 23 located in the middle drive the octagonal sliders 24 inside them to rotate clockwise around the axis of the bolt 13. Figure 11As shown, the four octagonal sliders 24 in the middle drive the nuts 14 inside them to rotate clockwise around the axis of the bolts 13, thereby tightening the four bolts 13 in the middle.

[0056] As a further embodiment of the present invention, as the hollow cylinder 2 rotates counterclockwise, the adjusting wheel 5 slides along the spiral rail 462 and moves closer to the rear flat rail 463. Under the limiting action of the sliding hole 31 and the sliding block 3, the adjusting cylinder 46 pushes the sliding block 3 and the first gear 22 along the sliding hole 31 toward the well repair platform connecting steel plate 12 through the two adjusting wheels 5. The distance between the side of the first gear 22 near the rear gear 26 and the side of the rear gear 26 near the first gear 22 gradually decreases. When the first gear 22 approaches the rear gear 26... When the distance between one side of the rear gear 26 and the side of the first gear 22 is zero, the teeth of the first gear 22 and the teeth of the rear gear 26 are just interlocked (i.e., the rear gear 26 will not block the first gear 22 from continuing to move along the sliding hole 31 toward the well repair platform connecting steel plate 12). The adjusting cylinder 46 continues to push the first gear 22 to move along the sliding hole 31 toward the well repair platform connecting steel plate 12 until the two adjusting wheels 5 slide and connect with the rear flat rail 463. At this time, the first gear 22 and the two rear gears 26 are fully meshed.

[0057] As a further embodiment of the present invention, as the hollow cylinder 2 rotates counterclockwise, the hollow cylinder 2 drives four sliding blocks 3 to rotate counterclockwise around the axis of the hollow cylinder 2 through four sliding holes 31 on its outer circumference. The four sliding blocks 3 drive the first gear 22 to rotate counterclockwise around the axis of the hollow cylinder 2. Under the sliding connection between the adjusting wheel 5 and the rear flat rail 463, the four sliding blocks 3 and the first gear 22 are limited (the first gear 22 and the sliding blocks 3 will not slide along the sliding holes 31), so that the first gear 22 is always in the center. In the rear half of the outer circumference of the empty cylinder 2, the first gear 22 is always externally meshed with the two rear gears 26. Under the action of the external meshing between the first gear 22 and the rear gears 26, the counterclockwise rotating first gear 22 drives the two rear gears 26 to rotate clockwise around the axis of the inner octagonal cylinder 23. The clockwise rotating rear gears 26 drive the four inner octagonal cylinders 23 located on the upper and lower sides to rotate clockwise around their own axes. The four inner octagonal cylinders 23 located on the upper and lower sides drive the octagonal sliders 24 inside them to rotate clockwise around the axis of the bolt 13. Figure 11 As shown, the four octagonal sliders 24 located on the upper and lower sides drive the nuts 14 inside them to rotate clockwise around the axis of the bolts 13, thereby tightening the four bolts 13 located on the upper and lower sides.

[0058] This invention utilizes a socket wrench to rotate two hexagonal drive blocks 21 on the front side of the connecting steel plate 12 of the well workover platform. This allows for the following: first, the four bolts 13 in the middle are tightened, followed by the four bolts 13 on the upper and lower sides. The tightening sequence proceeds from the center of the bolt group outwards, ensuring a uniform distribution of preload from the center to the periphery. This uniform distribution guarantees a relatively balanced preload on each bolt 13, ensuring the sealing and reliability of the connection. Furthermore, tightening the bolts from the center outwards gradually disperses stress, making the stress distribution more even throughout the connection area. Multiple bolts 13 can be tightened in a single operation with the socket wrench, reducing the overall number of tightening operations. The bolt tightening process is simple and convenient, improving bolt tightening efficiency and consequently increasing the construction efficiency of the self-elevating offshore well workover platform.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A steel structural connector for a jack-up offshore workover rig, characterized in that, Include: The well repair platform beam plate (1), both ends of the well repair platform beam plate (1) are provided with well repair platform vertical beam plate (11), the well repair platform vertical beam plate (11) is fixedly connected with well repair platform connecting steel plate (12) near one side of well repair platform beam plate (1), the outer surface of the well repair platform connecting steel plate (12) is provided with connecting hole (121), the inside of the connecting hole (121) is provided with bolt (13), one end of the bolt (13) is provided with nut (14); The hollow cylinder (2) is rotatably connected to the side of the well repair platform connecting steel plate (12) away from the well repair platform beam plate (1), the circumferential outer surface of the hollow cylinder (2) is slidably connected with a gear (22), the side of the well repair platform connecting steel plate (12) away from the well repair platform beam plate (1) is rotatably connected with an inner octagonal cylinder (23), the inner wall of the inner octagonal cylinder (23) is slidably connected with an octagonal slider (24), the nut (14) is fixedly connected to the inner wall of the octagonal slider (24); Wherein, the inner octagonal cylinder (23) is provided with eight and symmetrically distributed on the outer surface of the well repair platform connecting steel plate (12), the circumferential outer surface of the four inner octagonal cylinders (23) located on the upper and lower sides is fixedly connected with a rear gear (26), the circumferential outer surface of the four inner octagonal cylinders (23) located in the middle is fixedly connected with a front gear (25), the first gear (22) is engaged with the front gear (25) outside; The hollow cylinder (2) is rotatably connected with the well repair platform connecting steel plate (12) through the inner gear ring (4), the side of the well repair platform connecting steel plate (12) away from the well repair platform beam plate (1) is rotatably connected with a second gear (41), a third gear (42) and a fourth gear (43), the axis of the fourth gear (43) is collinear with the axis of the hollow cylinder (2), the second gear (41) is engaged with the inner gear ring (4) inside, the second gear (41) is engaged with the third gear (42) outside, the third gear (42) is engaged with the fourth gear (43) outside; The fourth gear (43) is fixedly connected with a central shaft (44) away from the well repair platform connecting steel plate (12), the circumferential outer surface of the central shaft (44) is fixedly connected with two ring frames (45), the circumferential outer surfaces of the two ring frames (45) are fixedly connected with an adjusting cylinder (46) together; The circumferential outer surface of the adjusting cylinder (46) is respectively provided with a front flat rail (461), a spiral rail (462) and a rear flat rail (463), one end of the spiral rail (462) is fixedly communicated with the front flat rail (461), the other end of the spiral rail (462) is fixedly communicated with the rear flat rail (463).

2. A steel structural connection for a jack-up offshore workover rig platform according to claim 1, characterized in that: The hollow cylinder (2) is provided with sliding holes (31) on the circumferential outer surface, the sliding holes (31) are four and are circumferentially arrayed on the circumferential outer surface of the hollow cylinder (2), the inner wall of the first gear (22) is fixedly connected with sliding clamping blocks (3), the sliding clamping blocks (3) are four and are circumferentially arrayed on the inner wall of the first gear (22), and the first gear (22) is slidably connected with the sliding holes (31) through the sliding clamping blocks (3).

3. A steel structural connection for a jack-up offshore workover rig platform according to claim 2, characterized in that: Two sliding clamping blocks (3) located in the middle are rotatably connected with adjusting wheels (5) on the side close to each other, and the two adjusting wheels (5) are slidably connected in the inside of the front flat rail (461). Wherein, in the process that the adjusting wheel (5) is slidably connected with the front flat rail (461), the first gear (22) is meshingly connected with the front gear (25), and in the process that the adjusting wheel (5) is slidably connected with the rear flat rail (463), the first gear (22) is meshingly connected with the rear gear (26).

4. A steel structural connection for a jack-up offshore workover rig platform according to claim 3, characterized in that: The hollow cylinder (2) is fixedly connected with a hexagonal driving block (21) at the end away from the well repair platform connecting steel plate (12).

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