A stress-dispersing reinforcement structure for deck openings on a marine platform and its application method

Abstract

This invention discloses a deck opening reinforcement structure for offshore platforms with stress dispersion function, comprising a deck plate, an oblong hole, and surrounding flat steel bars. The deck plate is horizontally arranged and has an oblong hole running vertically through it. The long axis of the oblong hole is aligned with the main stress direction of the deck plate. The inner wall of the oblong hole is smooth. Two surrounding flat steel bars are fully welded around the inner circumference of the oblong hole, and the surrounding flat steel bars have a transversely extending U-shaped structure. This invention utilizes the two surrounding flat steel bars to join together and then fully weld them together, while simultaneously fully welding them to the oblong hole. This creates a closed-loop structure, which can effectively bear stress in any horizontal direction and achieve a dispersion effect. Furthermore, because the feet of the surrounding flat steel bars are of different lengths, their joints are staggered, making it difficult for forces flowing in the same direction to pass through both joints simultaneously, further improving the stress-bearing capacity and thus enhancing structural stability.

Description

Technical Field

[0001] This invention relates to an opening reinforcement structure, and more particularly to a marine platform deck opening reinforcement structure with stress dispersion function and its application method. Background Technology

[0002] During operation, offshore platforms may have through openings in their decks for transportation or passage. These through openings can cause stress concentration, so reinforcement structures that meet the requirements are needed. Flanged flat steel is a commonly used reinforcement structure. Traditional fenders are typically separate and unjoined, which means they can only disperse stress concentration at corners, not at unjoined openings. Therefore, additional structures are usually needed for reinforcement. For example, Chinese invention patent CN202411727286.3 provides a deck reinforcement structure to reduce stress concentration at deck openings, which uses transverse and longitudinal reinforcing ribs. This has the following drawbacks: First, the use of reinforcing ribs requires welding, increasing construction difficulty and cost; second, the unjoined fenders result in weak transverse stress bearing capacity at unjoined openings, leading to structural instability; third, the unjoined fenders increase the difficulty of mutual reference, making it harder to control the vertical position of the relative openings, thus increasing construction difficulty; fourth, the unjoined fenders result in weak adhesion stability to the inner wall of the opening, increasing control difficulty during construction. Summary of the Invention

[0003] The purpose of this invention is to provide a stress-dispersing deck opening reinforcement structure for marine platforms and its application method, in order to solve the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A stress-dispersing reinforcement structure for a marine platform deck opening includes a deck plate, an oblong hole, and flange flat steel. The deck plate is horizontally arranged and has an oblong hole running through it vertically. The long axis of the oblong hole is aligned with the main stress direction of the deck plate. The inner wall of the oblong hole is smooth. Two flange flat steels are fully welded around the inner circumference of the oblong hole. The flange flat steels have a horizontally extending U-shaped structure. The arc portion of the flange flat steel is attached to and fully welded to the inner arc wall of the oblong hole. The two legs of the same flange flat steel, away from the arc portion, have different lengths. The horizontal end face of the flange flat steel is perpendicular to the extension direction of the leg. The two flange flat steels are centrally symmetrical about the oblong hole, and their horizontal end faces are fully welded to each other. The upper and lower ends of the flange baffle protrude from the upper and lower ends of the deck plate, respectively.

[0006] Based on the above technical solution, the upper and lower ends of the deck plate near the oval hole are parallel and straight to each other, and the upper and lower ends of the flange flat steel are parallel to the upper and lower ends of the deck plate near the oval hole, respectively.

[0007] Based on the above technical solution, the surrounding flat steel is horizontally inserted with multiple removable clamping components. Each clamping component has a removable tightening bolt threaded through its upper and lower parts. The axial end face of the screw of the tightening bolt in the upper and lower parts of the clamping component can respectively fit with the upper and lower end faces of the deck plate.

[0008] Based on the above technical solution, the clamping assembly includes a main clamping seat, a secondary clamping seat, and contact rollers. The main clamping seat and the secondary clamping seat are both U-shaped with horizontal right-angle transitions. The upper and lower ends of the inner wall of the main clamping seat are straight and fit against the upper and lower ends of the surrounding flat steel. The upper and lower ends of the inner wall of the secondary clamping seat are also straight and fit against the upper and lower ends of the surrounding flat steel. The main clamping seat is horizontally inserted into the middle of the arc portion of the surrounding flat steel. The secondary clamping seat is horizontally inserted into the foot portion of the surrounding flat steel. The inner sidewall of the secondary clamping seat fits against the inner sidewall of the surrounding flat steel. Vertical contact rollers are rotatably connected to the front and rear parts of the main clamping seat. The contact rollers of the front and rear parts of the same main clamping seat fit against the inner sidewall of the same surrounding flat steel. The upper and lower parts of the main clamping seat and the secondary clamping seat are respectively threaded with detachable tightening bolts.

[0009] Based on the above technical solution, a main clamping seat and three auxiliary clamping seats are fitted and inserted into the same flange flat steel. The tightening bolts are of the same size, and their heads away from the screw are dome-shaped. When the auxiliary clamping seat is fitted with the inner wall of the flange flat steel, the shortest distance from the outer wall of the tightening bolt where it is located to the outer wall of the flange flat steel is greater than the outer diameter of the screw part of the tightening bolt. When the contact roller is fitted with the inner wall of the flange flat steel, the shortest distance from the outer wall of the tightening bolt of the main clamping seat where it is located to the outer wall of the flange flat steel is greater than the outer diameter of the screw part of the tightening bolt.

[0010] Based on the above technical solution, the two main clamping seats are symmetrically arranged with respect to the oval holes and are jointly equipped with a detachable main telescopic bracket. The main telescopic bracket includes a left bracket, a right bracket, and a main bidirectional lead screw. The left and right brackets are linearly slidably connected. The axial direction of the main bidirectional lead screw is the same as the sliding direction of the left and right brackets. The external threads of the left and right parts of the main bidirectional lead screw have opposite directions. The left and right parts of the main bidirectional lead screw are respectively threadedly connected to the left and right brackets. A main handwheel is coaxially fixed to the outer circumferential wall of the middle part of the main bidirectional lead screw. When the main bidirectional lead screw rotates forward and backward, it can drive the left and right brackets to move closer and further apart. The left and right brackets are respectively detachably inserted into the main clamping seats in a left and right lateral manner.

[0011] Based on the above technical solution, at least two pairs of auxiliary clamping seats at the front and rear of the oblong hole are arranged symmetrically front and rear. A detachable auxiliary telescopic bracket is installed between the symmetrical auxiliary clamping seats. The auxiliary telescopic bracket includes a front bracket, a rear bracket, a lead screw, a screw barrel, and an auxiliary handwheel. The front bracket and the rear bracket are arranged opposite to each other. The adjacent ends of the front bracket and the rear bracket are respectively fixed with lead screws. The lead screws are arranged transversely front and rear. The external threads of the lead screws of the front bracket and the rear bracket are opposite in direction. The internal threads of the front and rear parts of the screw barrel are opposite in direction. The front and rear parts of the screw barrel are coaxially threaded to the lead screws of the front bracket and the rear bracket. An auxiliary handwheel is coaxially fixed to the outer wall of each of the front and rear parts of the screw barrel. The front bracket and the rear bracket are respectively detachably inserted into the auxiliary clamping seats. The main telescopic bracket also includes a receiving groove. The left bracket and the right bracket are respectively provided with receiving grooves that pass through the front and rear. The receiving grooves allow the auxiliary telescopic bracket to pass completely through front and rear.

[0012] Based on the above technical solution, a detachable main top plate and a secondary top plate are horizontally fitted and inserted into the gap between the upper and lower parts of the secondary clamping seat and the upper and lower ends of the clamping plate. The end of the main top plate near the tightening bolt has a wedge-shaped structure. The wedge-shaped structure of the main top plate is inclined towards the tightening bolt and converges towards the deck plate. The secondary top plate has a blind hole that matches the screw of the tightening bolt. The blind hole and the screw of the tightening bolt are inserted vertically. The end of the secondary top plate near the main top plate matches the wedge-shaped structure of the main top plate. When the tightening bolt moves towards the deck plate, it can push the secondary top plate to squeeze the main top plate, so that the main top plate and the secondary clamping seat jointly clamp the inner and outer walls of the perimeter flat steel. When the main top plate and the secondary clamping seat jointly clamp the inner and outer walls of the perimeter flat steel, the clamping position can be located at the joint of the two perimeter baffles.

[0013] Based on the above technical solution, vertical baffles are fixed at both ends of the main top plate. The main top plate is connected to the auxiliary clamping seat through the baffles on both sides. The auxiliary top plate is inserted between the baffles on both sides of the main top plate. The baffles on both sides of the main top plate are simultaneously in contact with the left and right ends of the auxiliary clamping seat and the left and right ends of the main top plate. The outer wall of the part of the screw of the tightening bolt that is inserted into the blind hole is smooth, while the other parts are machined with external threads.

[0014] Based on the above technical solution, a method for using a stress-dispersing reinforcement structure for a marine platform deck opening is provided, which utilizes the aforementioned stress-dispersing reinforcement structure for a marine platform deck opening, characterized by including the following steps:

[0015] Step 1: According to the main stress direction of the deck plate, make a through oval hole so that the long axis of the oval hole is the same as the main stress direction of the deck plate;

[0016] Step 2: First, insert a flange flat steel into the oval hole. Then, insert a main clamping seat and three auxiliary clamping seats into the flange flat steel. Then, rotate the top tightening bolts on the deck plate so that the top tightening bolts contact and fit with the top of the deck plate. Then, use an external plate for verification to touch the top of the dome of the four top tightening bolts on the deck plate to check whether each dome is in contact with the plate at the same time. Adjust the top tightening bolts that are not in contact until they are in contact. Then, rotate the top tightening bolts on the bottom of the deck plate so that the top tightening bolts on the top and bottom sides of the deck plate respectively contact and fit with the deck plate.

[0017] Step 3: Install the other flange flat steel and the oval hole using the method described in Step 2;

[0018] Step 4: Use an external plate for verification to touch the domes of any four tightening bolts above the deck plate and any four tightening bolts below the deck plate again to check whether they are in contact at the same time. Adjust the tightening bolts that cannot be in contact at the same time. This will help determine whether the upper and lower ends of the flange flat steel are flush with the upper and lower ends of the deck plate, so as to promote uniform stress.

[0019] Step 5: Install the main telescopic bracket so that the left and right brackets are inserted into the two main clamping seats respectively. By manually rotating the main handwheel, the left and right brackets are moved away from each other, so that the contact roller is in contact with the surrounding flat steel, and at the same time, the arc part of the surrounding flat steel is pushed to fit with the arc part of the oblong hole.

[0020] Step 6: Install the secondary telescopic bracket through the receiving slot, so that the front bracket and the rear bracket are respectively inserted into the secondary clamping seats on the front and rear sides. By manually rotating the secondary handwheel, the front bracket and the rear bracket are moved away from each other, so that the secondary clamping seats are in contact with the surrounding flat steel, and at the same time, the feet of the surrounding flat steel are pushed to fit into the straight part of the oblong hole.

[0021] Step 7: Use welding equipment to fully weld the joint between the flange flat steel and the oval hole, as well as the joint between the flange flat steel and the flange flat steel. After welding, grind to ensure that the weld is smooth, without burrs or abnormal protrusions.

[0022] Step 8: First, remove the secondary telescopic bracket, then remove the main telescopic bracket, then remove the main clamping seat, and then remove the four secondary clamping seats, leaving two to be inserted with the surrounding flat steel. Then adjust the position of the remaining two secondary clamping seats relative to the surrounding flat steel so that they correspond to the joints of the two surrounding flat steels. Then loosen the tightening bolts, install the main top plate and the secondary top plate, and make the blind holes and the tightening bolts correspond vertically. Then tighten the tightening bolts so that the tightening bolts are inserted with the blind holes, thereby pushing the secondary top plate to press against the main top plate, so that the main top plate and the secondary clamping seats together clamp the joints of the surrounding flat steels. Then, use welding equipment to fully weld the joints of the baffle and the secondary clamping seats, the joints of the baffle and the secondary top plate, and the joints of the tightening bolts and the secondary clamping seats. After welding, use a cutting tool to cut and grind the part of the tightening bolts protruding from the secondary clamping seats.

[0023] Compared with the prior art, the present invention has the following advantages: The present invention utilizes two perimeter flat steels to join together and then fully weld them together, while also fully welding them together with the oval hole, so that the two perimeter flat steels form a closed-loop structure, which can effectively bear stress in any horizontal direction and achieve a dispersion effect. Since the feet of the perimeter flat steels are of different lengths, the joints of the two are staggered, making it difficult for the force flow in the same direction to pass through the two joints at the same time, which further improves the stress bearing capacity and thus improves the structural stability. Furthermore, since they are joined together, they are also easy to refer to each other and repel each other, which facilitates installation and ensures a close fit with the oval hole, thereby improving the stress dispersion capacity.

[0024] The clamping components and tightening bolts facilitate the engagement with the flange flat steel and the oval hole, providing support and positional constraint during flange flat steel installation. This prevents accidental detachment of the flange flat steel from the oval hole, making installation easier. The tightening bolts, when rotated, fit against the deck plate, allowing for easy adjustment of the flange flat steel's vertical position relative to the oval hole, thus simplifying construction. The detachable nature of the clamping components and tightening bolts facilitates reuse and saves costs.

[0025] The detachable main telescopic bracket and auxiliary telescopic bracket can assist in the repulsive support of the flange flat steel, so that the two flange flat steel can fully fit with the oval hole, which is convenient for welding and fixing, and can also better bear the stress after welding. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the axial structure of the present invention.

[0027] Figure 2 This is a schematic diagram showing the fit between the main clamping seat, the auxiliary clamping seat, the surrounding flat steel, and the deck plate of the present invention.

[0028] Figure 3This is a schematic diagram showing the fit between the main top plate, the secondary top plate, and the surrounding flat steel of the present invention.

[0029] In the diagram: 1. Deck plate, 2. Oval hole, 3. Flanged flat steel, 4. Clamping assembly, 5. Tightening bolt, 6. Main clamping seat, 7. Secondary clamping seat, 8. Contact roller, 9. Main telescopic support, 10. Left support, 11. Right support, 12. Main double-acting screw, 13. Main handwheel, 14. Secondary telescopic support, 15. Front support, 16. Rear support, 17. Screw, 18. Screw barrel, 19. Secondary handwheel, 20. Receiving groove, 21. Main top plate, 22. Secondary top plate, 23. Blind hole, 24. Baffle. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figures 1-3 As shown, a stress-dispersing deck opening reinforcement structure for a marine platform includes a deck plate 1, an oval hole 2, and a flange flat steel 3. The deck plate 1 is arranged laterally and has an oval hole 2 running through it vertically. The long axis of the oval hole 2 is arranged along the main stress direction of the deck plate 1. The inner wall of the oval hole 2 is smooth. Two flange flat steels 3 are fully welded around the inner edge of the oval hole 2. The flange flat steels 3 have a transversely extending U-shaped structure. The arc portion of the flange flat steel 3 is attached to and fully welded to the inner arc wall of the oval hole 2. The two feet of the same flange flat steel 3 away from the arc portion have different lengths. The transverse end face of the flange flat steel 3 is perpendicular to the extension direction of the foot. The two flange flat steels 3 are centrally symmetrical about the oval hole 2, and their transverse end faces are fully welded to each other. The upper and lower ends of the flange baffle 24 protrude from the upper and lower ends of the deck plate 1, respectively.

[0032] Two perimeter flat steel bars 3 are joined together and then fully welded to each other, and simultaneously fully welded to the oval hole 2, forming a closed-loop structure. This structure can effectively bear stress in any horizontal direction and achieve a dispersion effect. Because the feet of the perimeter flat steel bars 3 are of different lengths, the joints are staggered, making it difficult for forces in the same direction to pass through both joints simultaneously, further improving the stress-bearing capacity and thus enhancing structural stability. The joints also facilitate mutual reference and repulsion, making installation easier and ensuring a close fit with the oval hole 2, thereby improving the stress dispersion capability. Full penetration welding can be used for welding.

[0033] The upper and lower ends of the deck plate 1 near the oval hole 2 are parallel and straight to each other, and the upper and lower ends of the flange flat steel 3 are parallel to the upper and lower ends of the deck plate 1 near the oval hole 2, respectively.

[0034] The upper and lower ends of the flange flat steel 3 are parallel to the upper and lower ends of the deck plate 1, which facilitates the use of measuring tools to measure the distance from the upper and lower ends of the flange flat steel 3 to the upper and lower ends of the deck plate 1, thereby meeting the construction standards and promoting uniform stress distribution.

[0035] The surrounding flat steel 3 is horizontally inserted with multiple removable clamping components 4. Each of the upper and lower parts of the clamping component 4 is threaded with a removable tightening bolt 5. The axial end face of the screw of the tightening bolt 5 on the upper and lower parts of the clamping component 4 can respectively fit with the upper and lower end faces of the deck plate 1.

[0036] The clamping assembly 4 and the tightening bolt 5 facilitate cooperation with the flange flat steel 3 and the oval hole 2, providing support and positional constraint during the installation of the flange flat steel 3, preventing accidental detachment of the flange flat steel 3 from the oval hole 2, and making installation convenient. The tightening bolt 5 is rotated to fit against the deck plate 1, making it easy to adjust the vertical position of the flange flat steel 3 relative to the oval hole 2, which facilitates construction. The detachable nature of the clamping assembly 4 and the tightening bolt 5 allows for reuse and saves costs.

[0037] The clamping assembly 4 includes a main clamping seat 6, a secondary clamping seat 7, and contact rollers 8. The main clamping seat 6 and the secondary clamping seat 7 are both U-shaped with horizontal right-angle transitions. The upper and lower ends of the inner wall of the main clamping seat 6 are straight and fit against the upper and lower ends of the surrounding flat steel 3. The upper and lower ends of the inner wall of the secondary clamping seat 7 are straight and fit against the upper and lower ends of the surrounding flat steel 3. The main clamping seat 6 is horizontally inserted into the middle of the arc portion of the surrounding flat steel 3. The secondary clamping seat 7 is horizontally inserted into the foot portion of the surrounding flat steel 3. The inner side wall of the secondary clamping seat 7 fits against the inner side wall of the surrounding flat steel 3. The front and rear parts of the main clamping seat 6 are each rotatably connected with a vertical contact roller 8. The contact rollers 8 of the front and rear parts of the same main clamping seat 6 are respectively fitted against the inner side wall of the same surrounding flat steel 3. The upper and lower parts of the main clamping seat 6 and the secondary clamping seat 7 are respectively threaded with detachable tightening bolts 5.

[0038] A main clamping seat 6 and three auxiliary clamping seats 7 are fitted and inserted into the same perimeter flat steel 3. The tightening bolts 5 are of the same size, and their heads away from the screw are dome-shaped. When the auxiliary clamping seat 7 is fitted with the inner wall of the perimeter flat steel 3, the shortest distance from the outer wall of the tightening bolt 5 to the outer wall of the perimeter flat steel 3 is greater than the outer diameter of the screw part of the tightening bolt 5. When the contact roller 8 is fitted with the inner wall of the perimeter flat steel 3, the shortest distance from the outer wall of the tightening bolt 5 of the main clamping seat 6 to the outer wall of the perimeter flat steel 3 is greater than the outer diameter of the screw part of the tightening bolt 5.

[0039] The screw of the tightening bolt 5 is kept at a certain distance from the outer wall of the flange flat steel 3 to facilitate welding with welding equipment.

[0040] The two main clamping seats 6 are symmetrically arranged on the left and right sides of the oblong hole 2, and are jointly equipped with a detachable main telescopic bracket 9. The main telescopic bracket 9 includes a left bracket 10, a right bracket 11, and a main bidirectional lead screw 12. The left bracket 10 and the right bracket 11 are linearly slidably connected on the left and right sides. The axial direction of the main bidirectional lead screw 12 is the same as the sliding direction of the left bracket 10 and the right bracket 11. The external threads of the left and right parts of the main bidirectional lead screw 12 are opposite in direction. The left and right parts of the main bidirectional lead screw 12 are respectively threadedly connected to the left bracket 10 and the right bracket 11. A main handwheel 13 is coaxially fixed to the outer circumferential wall of the middle part of the main bidirectional lead screw 12. When the main bidirectional lead screw 12 rotates forward and backward, it can drive the left bracket 10 and the right bracket 11 to move closer and further away from each other. The left bracket 10 and the right bracket 11 are respectively detachably inserted into the main clamping seats 6 on the left and right sides.

[0041] At least two pairs of auxiliary clamping seats 7 are symmetrically arranged at the front and rear of the oblong hole 2. A detachable auxiliary telescopic bracket 14 is installed between the symmetrical auxiliary clamping seats 7. The auxiliary telescopic bracket 14 includes a front bracket 15, a rear bracket 16, a lead screw 17, a screw barrel 18, and an auxiliary handwheel 19. The front bracket 15 and the rear bracket 16 are arranged opposite each other. The adjacent ends of the front bracket 15 and the rear bracket 16 are respectively fixed with lead screws 17. The lead screws 17 are arranged laterally. The external threads of the lead screws 17 on the front bracket 15 and the rear bracket 16 are... Conversely, the internal threads of the front and rear parts of the screw barrel 18 are rotated in opposite directions. The front and rear parts of the screw barrel 18 are coaxially threaded with the lead screw 17 of the front bracket 15 and the lead screw 17 of the rear bracket 16. The outer walls of the front and rear parts of the screw barrel 18 are each coaxially fixed with an auxiliary handwheel 19. The front bracket 15 and the rear bracket 16 are respectively detachably inserted into the auxiliary clamping seat 7. The main telescopic bracket 9 also includes a receiving groove 20. The left bracket 10 and the right bracket 11 are respectively provided with receiving grooves 20 through the front and rear. The receiving grooves 20 allow the auxiliary telescopic bracket 14 to pass completely through.

[0042] Furthermore, the detachable main telescopic bracket 9 and the secondary telescopic bracket 14 can assist in the repulsive support of the surrounding flat steel 3, so that the two surrounding flat steel 3 can fully fit with the oval hole 2, which facilitates welding and fixing, and can also better bear stress after welding.

[0043] The main top plate 21 and the secondary top plate 22, which can be disengaged, are horizontally fitted and inserted into the gap between the upper and lower parts of the secondary clamping seat 7 and the upper and lower ends of the clamping plate. The end of the main top plate 21 near the tightening bolt 5 has a wedge-shaped structure. The wedge-shaped structure of the main top plate 21 is inclined towards the tightening bolt 5 and converges towards the deck plate 1. The secondary top plate 22 has a blind hole 23 that matches the screw of the tightening bolt 5. The blind hole 23 is inserted vertically into the screw of the tightening bolt 5. The end of the secondary top plate 22 near the main top plate 21 matches the wedge-shaped structure of the main top plate 21. When the tightening bolt 5 moves towards the deck plate 1, it can push the secondary top plate 22 to squeeze the main top plate 21, so that the main top plate 21 and the secondary clamping seat 7 jointly clamp the inner and outer walls of the perimeter flat steel 3. When the main top plate 21 and the secondary clamping seat 7 jointly clamp the inner and outer walls of the perimeter flat steel 3, the clamping position can be located at the joint of the two perimeter baffles 24.

[0044] The main top plate 21 and the auxiliary clamping seat 7 together clamp the joint of the surrounding flat steel 3, which can restrict the front and rear positions of the two, thereby reducing the possibility of misalignment. At the same time, it can also achieve enclosed protection to improve structural stability.

[0045] The main top plate 21 has vertical baffles 24 fixed at both ends. The main top plate 21 is connected to the auxiliary clamping seat 7 through the baffles 24 on both sides. The auxiliary top plate 22 is inserted between the baffles 24 on both sides of the main top plate 21. The baffles 24 on both sides of the main top plate 21 are in contact with the left and right ends of the auxiliary clamping seat 7 and the left and right ends of the main top plate 21. The outer wall of the part of the screw of the tightening bolt 5 that is connected to the blind hole 23 is smooth, while the other parts are machined with external threads.

[0046] Furthermore, by setting baffle 24, the position of the main top plate 21 and the secondary top plate 22 can be restricted to ensure that the left and right positions of the main top plate 21 and the secondary top plate 22 relative to the secondary clamping seat 7 are stable. At the same time, it can guide the sliding of the main top plate 21 and the secondary top plate 22, which facilitates the clamping of the surrounding flat steel 3. The outer wall of the part where the screw of the tightening bolt 5 is inserted into the blind hole 23 is smooth, which allows the tightening bolt 5 to better cooperate with the blind hole 23 to reduce jamming.

[0047] A method for using a stress-dispersing reinforcement structure for offshore platform deck openings, comprising the following steps:

[0048] Step 1: According to the main stress direction of the deck plate 1, make a through oval hole 2 so that the long axis of the oval hole 2 is the same as the main stress direction of the deck plate 1.

[0049] Step 2: First, insert a flange flat steel 3 into the oval hole 2. Then, insert a main clamping seat 6 and three auxiliary clamping seats into the flange flat steel 3. Then, rotate the top tightening bolt 5 above the deck plate 1 so that the top tightening bolt 5 contacts and fits with the top of the deck plate 1. Then, use an external plate for verification to touch the top of the dome of the four top tightening bolts 5 above the deck plate 1 to check whether each dome contacts the plate at the same time. Adjust the top tightening bolts 5 that do not contact until they do. Then, rotate the top tightening bolt 5 below the deck plate 1 so that the top tightening bolts 5 on the upper and lower sides of the deck plate 1 respectively contact and fit with the deck plate 1.

[0050] Step 3: Install the other flange flat steel 3 and the oval hole 2 according to the method in Step 2;

[0051] Step 4: Use an external plate for verification to touch the domes of any four tightening bolts 5 above the deck plate 1 and any four tightening bolts 5 below the deck plate again to check whether they are in contact at the same time. Adjust the tightening bolts 5 that cannot be in contact at the same time. This will help determine whether the upper and lower ends of the flange flat steel 3 are flush with the upper and lower ends of the deck plate 1, so as to promote uniform stress distribution.

[0052] Step 5: Install the main telescopic bracket 9 so that the left bracket 10 and the right bracket 11 are respectively inserted into the two main clamping seats 6. By manually rotating the main handwheel 13, the left bracket 10 and the right bracket 11 are moved away from each other, so that the contact roller 8 is in contact with the surrounding flat steel 3, and at the same time, the arc part of the surrounding flat steel 3 is pushed to fit with the arc part of the oblong hole 2.

[0053] Step 6: Install the secondary telescopic bracket 14 through the receiving groove 20, so that the front bracket 15 and the rear bracket 16 are respectively inserted into the secondary clamping seats 7 on the front and rear sides. By manually rotating the secondary handwheel 19, the front bracket 15 and the rear bracket 16 are moved away from each other, so that the secondary clamping seat 7 is in contact with the surrounding flat steel 3, and at the same time, the foot of the surrounding flat steel 3 is pushed to fit into the straight part of the oblong hole 2.

[0054] Step 7: Fully weld the joint between the flange flat steel 3 and the oval hole 2, as well as the joint between the flange flat steel 3 and the flange flat steel 3 using welding equipment. After welding, grind to ensure that the weld is smooth, without burrs or abnormal protrusions.

[0055] Step 8: First, remove the secondary telescopic bracket 14, then remove the main telescopic bracket 9, then remove the main clamping seat 6, and then remove the four secondary clamping seats 7, leaving two to be inserted with the surrounding flat steel 3. Then adjust the position of the remaining two secondary clamping seats 7 relative to the surrounding flat steel 3 so that they correspond to the joints of the two surrounding flat steel 3. Then loosen the tightening bolt 5, install the main top plate 21 and the secondary top plate 22, and make the blind hole 23 correspond vertically to the tightening bolt 5. Then tighten the tightening bolt. 5. The tightening bolt 5 is inserted into the blind hole 23, thereby pushing the secondary top plate 22 to press against the main top plate 21, so that the main top plate 21 and the secondary clamping seat 7 together clamp the joint of the surrounding flat steel 3. Then, the joint of the baffle 24 and the secondary clamping seat 7, the joint of the baffle 24 and the secondary top plate 22, and the joint of the tightening bolt 5 and the secondary clamping seat 7 are fully welded by welding equipment. After welding is completed, the part of the tightening bolt 5 protruding from the secondary clamping seat 7 is cut and polished smooth by cutting tool.

[0056] The above description represents a preferred embodiment of the present invention. For those skilled in the art, any changes, modifications, substitutions, and variations made to the implementation methods without departing from the principles and spirit of the present invention, based on the teachings of the present invention, still fall within the protection scope of the present invention.

Claims

1. A deck opening reinforcement structure for a marine platform with stress dispersion function, comprising a deck plate (1), an oval hole (2), and a surrounding flat steel (3), characterized in that: The deck plate (1) is arranged horizontally and has an oval hole (2) running through it from top to bottom. The long axis of the oval hole (2) is set along the main stress direction of the deck plate (1). The inner wall of the oval hole (2) is smooth. Two flange flat steels (3) are fully welded around the inner edge of the oval hole (2). The flange flat steels (3) have a U-shaped structure that extends horizontally. The arc part of the flange flat steels (3) is attached to the inner arc wall of the oval hole (2) and fully welded. The two feet of the same flange flat steel (3) that are far from the arc part have different lengths. The horizontal end face of the flange flat steel (3) is perpendicular to the extension direction of the foot. The two flange flat steels (3) are centrally symmetrical about the oval hole (2) and their horizontal end faces are fully welded to each other. The upper and lower ends of the flange baffle (24) protrude from the upper and lower ends of the deck plate (1).

2. The offshore platform deck opening reinforcement structure with stress dispersion function according to claim 1, characterized in that: The upper and lower ends of the deck plate (1) near the oval hole (2) are parallel and straight to each other, and the upper and lower ends of the flange flat steel (3) are parallel to the upper and lower ends of the deck plate (1) near the oval hole (2).

3. The offshore platform deck opening reinforcement structure with stress dispersion function according to claim 2, characterized in that: The surrounding flat steel (3) is horizontally inserted with multiple removable clamping components (4). Each of the upper and lower parts of the clamping components (4) is threaded with a removable tightening bolt (5). The axial end face of the screw of the tightening bolt (5) of the upper and lower parts of the clamping components (4) can respectively fit with the upper and lower end faces of the deck plate (1).

4. A stress-dispersing reinforcement structure for a marine platform deck opening according to claim 3, characterized in that: The clamping assembly (4) includes a main clamping seat (6), a secondary clamping seat (7), and a contact roller (8). The main clamping seat (6) and the secondary clamping seat (7) are U-shaped with horizontal right-angle transitions. The upper and lower ends of the inner wall of the main clamping seat (6) are straight and fit against the upper and lower ends of the surrounding flat steel (3). The upper and lower ends of the inner wall of the secondary clamping seat (7) are straight and fit against the upper and lower ends of the surrounding flat steel (3). The main clamping seat (6) is horizontally inserted into the middle of the arc portion of the surrounding flat steel (3). The auxiliary clamping seat (7) is horizontally inserted into the foot of the surrounding flat steel (3). The inner wall of the auxiliary clamping seat (7) is in contact with the inner wall of the surrounding flat steel (3). The front and rear parts of the main clamping seat (6) are each rotatably connected with a vertical contact roller (8). The contact rollers (8) of the front and rear parts of the same main clamping seat (6) are respectively in contact with the inner wall of the same surrounding flat steel (3). The upper and lower parts of the main clamping seat (6) and the auxiliary clamping seat (7) are respectively threaded with a removable tightening bolt (5).

5. A stress-dispersing reinforcement structure for a marine platform deck opening according to claim 4, characterized in that: A main clamping seat (6) and three auxiliary clamping seats (7) are fitted and inserted into the same perimeter flat steel (3). The tightening bolts (5) are of the same size, and their heads away from the screw are dome-shaped. When the auxiliary clamping seat (7) is fitted with the inner wall of the perimeter flat steel (3), the shortest distance from the outer wall of the tightening bolt (5) to the outer wall of the perimeter flat steel (3) is greater than the outer diameter of the screw part of the tightening bolt (5). When the contact roller (8) is fitted with the inner wall of the perimeter flat steel (3), the shortest distance from the outer wall of the tightening bolt (5) of the main clamping seat (6) to the outer wall of the perimeter flat steel (3) is greater than the outer diameter of the screw part of the tightening bolt (5).

6. A deck opening reinforcement structure for a marine platform with stress dispersion function according to claim 5, characterized in that: The two main clamping seats (6) are symmetrically arranged on the left and right sides of the oblong hole (2), and are jointly equipped with a detachable main telescopic bracket (9). The main telescopic bracket (9) includes a left bracket (10), a right bracket (11), and a main bidirectional screw (12). The left bracket (10) and the right bracket (11) are linearly slidably connected on the left and right sides. The axial direction of the main bidirectional screw (12) is the same as the sliding direction of the left bracket (10) and the right bracket (11). The left and right sides of the main bidirectional screw (12) are connected in a linear manner. The external threads rotate in opposite directions. The left and right parts of the main bidirectional screw (12) are respectively threaded to the left bracket (10) and the right bracket (11). The main handwheel (13) is coaxially fixed on the outer circumferential wall of the middle part of the main bidirectional screw (12). When the main bidirectional screw (12) rotates forward and backward, it can drive the left bracket (10) and the right bracket (11) to move closer and further away from each other. The left bracket (10) and the right bracket (11) are respectively detached from the main clamping seat (6) and can be inserted laterally.

7. A stress-dispersing reinforcement structure for a marine platform deck opening according to claim 6, characterized in that: At least two pairs of auxiliary clamping seats (7) are arranged symmetrically in front and behind the oblong hole (2). A detachable auxiliary telescopic bracket (14) is installed between the symmetrical auxiliary clamping seats (7). The auxiliary telescopic bracket (14) includes a front bracket (15), a rear bracket (16), a lead screw (17), a screw barrel (18), and an auxiliary handwheel (19). The front bracket (15) and the rear bracket (16) are arranged opposite each other in front and behind. The adjacent ends of the front bracket (15) and the rear bracket (16) are respectively fixed with lead screws (17). The lead screws (17) are arranged laterally in front and behind. The external threads of the lead screws (17) where the front bracket (15) and the rear bracket (16) are located are... The screws of the front and rear parts of the screw barrel (18) are screwed in opposite directions. The front and rear parts of the screw barrel (18) are coaxially threaded with the lead screw (17) of the front bracket (15) and the lead screw (17) of the rear bracket (16). The outer walls of the front and rear parts of the screw barrel (18) are each coaxially fixed with a secondary handwheel (19). The front bracket (15) and the rear bracket (16) are respectively inserted into the secondary clamping seat (7) in a disengaging manner. The main telescopic bracket (9) also includes a receiving groove (20). The left bracket (10) and the right bracket (11) are respectively provided with receiving grooves (20) extending through the front and rear. The receiving grooves (20) allow the secondary telescopic bracket (14) to pass completely through the front and rear.

8. A deck opening reinforcement structure for a marine platform with stress dispersion function according to claim 7, characterized in that: The upper and lower parts of the auxiliary clamping seat (7) are horizontally fitted with a detachable main top plate (21) and an auxiliary top plate (22) in the gap between the upper and lower ends of the clamping plate. The end of the main top plate (21) near the tightening bolt (5) has a wedge-shaped structure. The wedge-shaped structure of the main top plate (21) is inclined towards the tightening bolt (5) and converges towards the deck plate (1). The auxiliary top plate (22) has a blind hole (23) that matches the screw of the tightening bolt (5). The blind hole (23) is aligned with the screw of the tightening bolt (5). The sub-top plate (22) is connected to the wedge structure of the main top plate (21) at the end near the main top plate (21). When the tightening bolt (5) moves toward the deck plate (1), it can push the sub-top plate (22) to squeeze the main top plate (21) so that the main top plate (21) and the sub-clamping seat (7) together clamp the inner and outer walls of the flange flat steel (3). When the main top plate (21) and the sub-clamping seat (7) together clamp the inner and outer walls of the flange flat steel (3), the clamping position can be located at the joint of the two flange baffles (24).

9. A stress-dispersing reinforcement structure for a marine platform deck opening according to claim 8, characterized in that: The main top plate (21) has vertical baffles (24) fixed at both ends. The main top plate (21) is connected to the auxiliary clamping seat (7) through the baffles (24) on both sides. The auxiliary top plate (22) is inserted between the baffles (24) on both sides of the main top plate (21). The baffles (24) on both sides of the main top plate (21) are simultaneously attached to the left and right ends of the auxiliary clamping seat (7) and the left and right ends of the main top plate (21). The outer wall of the part of the screw of the tightening bolt (5) that is connected to the blind hole (23) is smooth, while the other parts are machined with external threads.

10. A method of using a stress-dispersing reinforcement structure for a marine platform deck opening, comprising the stress-dispersing reinforcement structure for a marine platform deck opening as described in claim 9, characterized in that, Includes the following steps: Step 1: According to the main stress direction of the deck plate (1), make a through oval hole (2) so that the long axis of the oval hole (2) is the same as the main stress direction of the deck plate (1); Step 2: First, insert a flange flat steel (3) into the oval hole (2), then insert a main clamping seat (6) and three auxiliary clamping seats into the flange flat steel (3), then rotate the top bolt (5) above the deck plate (1) so that the top bolt (5) contacts and fits against the top of the deck plate (1), then use an external plate for verification to touch the top of the dome of the four top bolts (5) above the deck plate (1) to check whether each dome contacts the plate at the same time. Adjust the top bolts (5) that do not contact until they contact, then rotate the top bolt (5) below the deck plate (1) so that the top bolts (5) on the upper and lower sides of the deck plate (1) respectively contact the deck plate (1); Step 3: Install the other flange flat steel (3) and the oval hole (2) according to the method in Step 2; Step 4: Use an external plate for verification to touch the domes of any four tightening bolts (5) above the deck plate (1) and any four tightening bolts (5) below the deck again to check whether they are in contact at the same time. Adjust the tightening bolts (5) that cannot be in contact at the same time. Step 5: Install the main telescopic bracket (9) so that the left bracket (10) and the right bracket (11) are respectively inserted into the two main clamping seats (6). By manually rotating the main handwheel (13), the left bracket (10) and the right bracket (11) are moved away from each other, so that the contact roller (8) is in contact with the surrounding flat steel (3), and at the same time, the arc part of the surrounding flat steel (3) is pushed to fit with the arc part of the oval hole (2); Step 6: Install the secondary telescopic bracket (14) through the receiving groove (20), so that the front bracket (15) and the rear bracket (16) are respectively inserted into the secondary clamping seats (7) on the front and rear sides. By manually rotating the secondary handwheel (19), the front bracket (15) and the rear bracket (16) are moved away from each other, so that the secondary clamping seat (7) is in contact with the surrounding flat steel (3), and at the same time, push the foot of the surrounding flat steel (3) to be in contact with the straight part of the oval hole (2); Step 7: Fully weld the joint between the flange flat steel (3) and the oval hole (2) and the joint between the flange flat steel (3) and the flange flat steel (3) using welding equipment. After welding, grind to ensure that the weld is smooth and free of burrs and abnormal protrusions. Step 8: First, remove the secondary telescopic bracket (14), then remove the main telescopic bracket (9), then remove the main clamping seat (6), then remove the four secondary clamping seats (7) while keeping two to be inserted with the surrounding flat steel (3). Then adjust the position of the remaining two secondary clamping seats (7) relative to the surrounding flat steel (3) so that they correspond to the joints of the two surrounding flat steels (3). Then loosen the top bolt (5), install the main top plate (21) and the secondary top plate (22), and make the blind hole (23) correspond vertically to the top bolt (5). Then tighten the top bolt (5). This causes the tightening bolt (5) to be inserted into the blind hole (23), thereby pushing the secondary top plate (22) to squeeze the main top plate (21), so that the main top plate (21) and the secondary clamping seat (7) together clamp the joint of the perimeter flat steel (3). Then, the joint of the baffle (24) and the secondary clamping seat (7), the joint of the baffle (24) and the secondary top plate (22), and the joint of the tightening bolt (5) and the secondary clamping seat (7) are fully welded by welding equipment. After welding, the part of the tightening bolt (5) protruding from the secondary clamping seat (7) is cut and polished smooth by cutting tool.

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