A semi-submersible offshore platform test simulation device

Abstract

The present invention discloses a semi-submersible offshore platform test simulation device, which relates to the technical field of semi-submersible offshore platform test simulation. It includes a platform model body, and the platform model body includes pontoons, columns, and a top support plate. Grating sensors are arranged on the platform model body, and a loading box is arranged outside the platform model body; simulation sand is loaded in the loading box; a wave simulation mechanism is arranged in the loading box; a settlement prevention mechanism is arranged below the wave simulation mechanism; the wave simulation mechanism includes transverse slide rails respectively fixed on the front and rear sides of the inner wall of the loading box in the left-right direction, and longitudinal slide rails respectively fixed on the left and right sides of the inner wall of the loading box in the front-rear direction. The beneficial effects of the present invention are: it simulates the load conditions of sea waves through the flow of sand, with a comprehensive simulation effect, good support for the platform model body, convenient layout, and low cost.

Description

Technical Field

[0001] The present invention relates to the technical field of semi-submersible offshore platform test simulation. Background Art

[0002] An offshore platform is a structure that provides production and living facilities for activities such as offshore exploration, drilling, oil production, transportation, observation, and construction. As a common type of offshore platform, the semi-submersible platform has the advantages of a wide operating water depth range, a small waterplane area, strong wave resistance, and a large variable load. However, since the semi-submersible offshore platform is a structure suspended in the ocean, its structural stability under wave impact needs to be considered. Therefore, usually, a corresponding simulation device is set up in a land environment to approximately simulate the structural response of the offshore platform under wave action.

[0003] Currently, when simulating the function of applying wave loads to an offshore platform model, usually a lifting device is used to lift the platform model to a suspended state; a row of slender cylinders are used at the bottom to support the platform model to reduce the friction with the ground to simulate the contact between the offshore platform and seawater, making it closer to the underwater constraint conditions; a wire rope-spring method is used to constrain the platform model to simulate the mooring device; different working conditions are simulated by controlling a hydraulic loading system; and a grating sensor is used to monitor the structural stress at various parts of the platform. However, this method has a complex layout, high cost, and an incomplete simulation effect on ocean wave loads. Although there is also a method of placing the platform model in water for simulation, in order to ensure that the platform model can be suspended in water, this method has high sealing requirements for various parts of the platform model (such as the sealing of pontoons, columns, etc.), increasing the cost, and it is not easy to effectively simulate various sea conditions, resulting in the simulation effect not meeting the requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is, aiming at the above-mentioned existing technical deficiencies, to provide a semi-submersible offshore platform test simulation device, which simulates the load conditions of ocean waves through the flow of sand, has a comprehensive simulation effect, good support for the platform model body, and is convenient to layout and has low cost.

[0005] The technical solution adopted by the present invention is: to provide a semi-submersible offshore platform test simulation device, including a platform model body, the platform model body includes pontoons, columns, and a top support plate, a grating sensor is arranged on the platform model body, and a bearing box is arranged outside the platform model body; the bearing box is filled with sand for simulation; a wave simulation mechanism is arranged in the bearing box; a settlement prevention mechanism is arranged below the wave simulation mechanism;

[0006] The described wave simulation mechanism includes transverse slide rails respectively fixed on the front and rear sides of the inner wall of the loading box along the left-right direction, and longitudinal slide rails respectively fixed on the left and right sides of the inner wall of the loading box along the front-rear direction; the longitudinal slide rails are arranged below the transverse slide rails; a transverse push bar is arranged between the two transverse slide rails along the front-rear direction; a longitudinal push bar is arranged between the two longitudinal slide rails along the left-right direction; both the transverse push bar and the longitudinal push bar are in a convex arc structure; transverse slide bars are respectively fixed at the front and rear ends of the transverse push bar; longitudinal slide bars are respectively fixed at the left and right ends of the longitudinal push bar; the transverse slide bars are respectively slidably connected to the corresponding transverse slide rails; the longitudinal slide bars are respectively slidably connected to the corresponding longitudinal slide rails; the left and right ends of the transverse slide bars respectively slide through the left and right sides of the loading box; the front and rear ends of the longitudinal slide bars respectively slide through the front and rear ends of the loading box; the same-side ends between the two transverse slide bars and the same-side ends between the two longitudinal slide bars are respectively connected by a stop bar;

[0007] The described anti-settlement mechanism includes sand-accumulating bars arranged at the bottom of the loading box and respectively parallel to the four walls of the loading box; the sand-accumulating bars are in a triangular prism structure and the angle between the inner side surface and the bottom surface of the sand-accumulating bars is not less than 90°; guide rods are fixed on the outer side surface of the sand-accumulating bars; the guide rods vertically penetrate through the corresponding side walls of the loading box; support sleeves slidably sleeved on the guide rods are respectively fixed on the outer wall of the loading box; baffles are fixed at the outer ends of the guide rods; when the support sleeves respectively block the baffles, the sand-accumulating bars do not contact each other.

[0008] The transverse push bar, the longitudinal push bar and the sand-accumulating bar are respectively linked with independent power mechanisms.

[0009] To further optimize this technical solution, the power mechanism of a semi-submersible offshore platform test simulation device is a hydraulic cylinder.

[0010] To further optimize this technical solution, the power mechanism of a semi-submersible offshore platform test simulation device is an electric push rod.

[0011] To further optimize this technical solution, the sand-accumulating bar of a semi-submersible offshore platform test simulation device is in a shell-like structure; air holes are distributed on the inner side surface of the sand-accumulating bar; rubber baffle pieces are respectively covered outside the air holes; the upper ends of the rubber baffle pieces are fixed to the sand-accumulating bar; the sand-accumulating bar is connected to an external air source through an air guide pipe.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The loading box is filled with sand for simulation. The platform model body can be placed on the sand, and the sand can effectively support it, simulating the state of the platform model body floating in seawater. There is no need to apply an external lifting device, which reduces the operation difficulty and is more convenient to deploy. Moreover, compared with the requirements for the platform model body when floating in water, the sealing requirement for the platform model body using sand is not high, which reduces the cost.

[0014] The horizontal pushing bar is arranged in the front-back direction, and horizontal sliding bars are respectively fixed at the front and rear ends of the horizontal pushing bar. The horizontal sliding bars are slidably connected to the corresponding horizontal sliding rails. The vertical pushing bar is arranged in the left-right direction, and vertical sliding bars are respectively fixed at the left and right ends of the vertical pushing bar. The vertical sliding bars are slidably connected to the corresponding vertical sliding rails. Both the horizontal pushing bar and the vertical pushing bar are in a convex arc-shaped structure. Through the sliding of the horizontal pushing bar and the vertical pushing bar, the sand can be driven to undulate, so as to effectively simulate undulating waves. The horizontal pushing bar and the vertical pushing bar can respectively simulate waves in the left-right direction and the front-back direction, and the simultaneous movement of the two can also simulate the situation where waves in two directions collide, and the simulation effect of the wave condition is more comprehensive.

[0015] The sand-gathering bars are respectively arranged in parallel corresponding to the four walls at the bottom of the bearing box. Through the sliding of the guiding rods vertically penetrating the side walls of the bearing box, the sand-gathering bars can be gathered together. And the sand-gathering bars are in a triangular prism-shaped structure, and the included angle between the inner side surface and the bottom surface of the sand-gathering bars is not less than 90°. Thus, as the sand-gathering bars gather together, the effect of gathering the sand towards the middle can be achieved, avoiding the situation that the platform model body keeps sinking in the sand.

[0016] 2. The sand-gathering bar is in a shell-like structure, and air holes are distributed on the inner side surface of the sand-gathering bar. The sand-gathering bar is connected to an external air source through an air duct. By blowing air through the air holes, the resistance during the movement of the sand-gathering bar can be reduced, facilitating its faster movement; rubber blocking pieces are respectively covered corresponding to the outside of the air holes, and the upper ends of the rubber blocking pieces are fixed to the sand-gathering bar. The rubber blocking pieces can play a role in blocking the sand, effectively reducing the situation that the sand backflows into the inside of the sand-gathering bar from the air holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic structural diagram of the platform model body;

[0019] Figure 3 is a schematic structural diagram of the wave simulation mechanism;

[0020] Figure 4 is a schematic structural diagram of the anti-settlement mechanism;

[0021] Figure 5 is a schematic structural diagram of the position of the sand-gathering bar.

[0022] In the figure, 1. Platform model body; 2. Floating cylinder; 3. Column; 4. Top support plate; 5. Grating sensor; 6. Bearing box; 7. Horizontal sliding rail; 8. Vertical sliding rail; 9. Horizontal pushing bar; 10. Vertical pushing bar; 11. Horizontal sliding bar; 12. Vertical sliding bar; 13. Stop bar; 14. Sand-gathering bar; 15. Guiding rod; 16. Baffle; 17. Support sleeve; 18. Power mechanism; 19. Air hole; 20. Rubber blocking piece; 21. Air duct. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] As Figure 1-2 shown, a semi-submersible offshore platform test simulation device includes a platform model body 1, and the platform model body 1 includes pontoons 2, columns 3, and a top support plate 4. A grating sensor 5 is arranged on the platform model body 1, and a loading box 6 is arranged outside the platform model body 1; simulation sand is loaded in the loading box 6; a wave simulation mechanism is arranged in the loading box 6; a settlement prevention mechanism is arranged below the wave simulation mechanism.

[0025] As Figure 3 shown, the wave simulation mechanism includes transverse slide rails 7 respectively fixed on the front and rear sides of the inner wall of the loading box 6 in the left-right direction, and longitudinal slide rails 8 respectively fixed on the left and right sides of the inner wall of the loading box 6 in the front-rear direction; the longitudinal slide rails 8 are arranged below the transverse slide rails 7; a transverse push bar 9 is arranged between the two transverse slide rails 7 in the front-rear direction; a longitudinal push bar 10 is arranged between the two longitudinal slide rails 8 in the left-right direction; both the transverse push bar 9 and the longitudinal push bar 10 are in a convex arc structure; transverse slide bars 11 are respectively fixed at the front and rear ends of the transverse push bar 9; longitudinal slide bars 12 are respectively fixed at the left and right ends of the longitudinal push bar 10; the transverse slide bars 11 are respectively slidably connected to the corresponding transverse slide rails 7; the longitudinal slide bars 12 are respectively slidably connected to the corresponding longitudinal slide rails 8; the left and right ends of the transverse slide bars 11 respectively slide through the left and right sides of the loading box 6; the front and rear ends of the longitudinal slide bars 12 respectively slide through the front and rear ends of the loading box 6; the same-side ends between the two transverse slide bars 11 and the same-side ends between the two longitudinal slide bars 12 are respectively connected by a stop bar 13.

[0026] As Figure 4-5 shown, the settlement prevention mechanism includes sand-accumulating strips 14 arranged at the bottom of the loading box 6 and respectively parallel to the four walls of the loading box 6; the sand-accumulating strips 14 are in a triangular prism structure and the angle between the inner side surface and the bottom surface of the sand-accumulating strips 14 is not less than 90°; a guide rod 15 is fixed on the outer side surface of the sand-accumulating strip 14; the guide rod 15 vertically penetrates the corresponding side wall of the loading box 6; a support sleeve 17 slidably sleeved outside the guide rod 15 is fixed on the outer wall of the loading box 6; a baffle 16 is fixed at the outer end of the guide rod 15; when the support sleeves 17 respectively block the baffle 16, the sand-accumulating strips 14 do not contact each other.

[0027] The transverse push bar 9, the longitudinal push bar 10 and the sand-accumulating strip 14 are respectively linked with independent power mechanisms 18; the power mechanism 18 is a hydraulic cylinder; the power mechanism 18 is an electric push rod; the sand-accumulating strip 14 is in a shell structure; air holes 19 are distributed on the inner side surface of the sand-accumulating strip 14; rubber baffles 20 are respectively covered outside the air holes 19; the upper ends of the rubber baffles 20 are fixed to the sand-accumulating strip 14; the sand-accumulating strip 14 is connected to an external air source through an air guide pipe 21.

[0028] The simulation sand is pre - loaded in the bearing box 6 (the wave simulation mechanism and the anti - settlement mechanism are buried by the sand). Just place the platform model body 1 on the sand in the bearing box 6. Through the effective support of the sand, the state of the offshore platform floating in the sea can be effectively simulated.

[0029] When it is necessary to simulate the impact of waves, make the wave simulation mechanism work. Through the linkage effect of the power mechanism 18, driving the horizontal push bar 9 to move left and right can make the sand undulate in the left - right direction, so as to effectively simulate the sea waves in the left - right direction. Similarly, driving the longitudinal push bar 10 to move back and forth can effectively simulate the sea waves in the front - back direction. The simulation of the wave condition is vivid and highly adaptable. Of course, in addition to the separate movement of the horizontal push bar 9 and the longitudinal push bar 10 to simulate the unidirectional wave situation, when both move simultaneously, it can also simulate the situation where the waves in two directions in the sea water strike simultaneously, making the simulation of the sea condition more comprehensive.

[0030] During the above operation, in order to prevent the sand from entering the horizontal slide rail 7 and the vertical slide rail 8 and hindering the sliding of the horizontal slide bar 11 and the vertical slide bar 12, and at the same time to expand the movement range of the horizontal push bar 9 and the longitudinal push bar 10, the horizontal slide bar 11 and the vertical slide bar 12 are set to penetrate through the side wall of the bearing box 6 (that is, both ends of the horizontal slide bar 11 extend out from both ends of the horizontal slide rail 7, and both ends of the vertical slide bar 12 extend out from both ends of the vertical slide rail 8). Of course, on this basis, in order to facilitate the linkage of the power mechanism 18 and the limit control of the sliding of the horizontal push bar 9 and the longitudinal push bar 10 (to avoid slipping), the same - side ends of the two horizontal slide bars 11 and the same - side ends of the two vertical slide bars 12 are respectively connected by a stop bar 13, and the output end of the corresponding power mechanism 18 can be connected to the stop bar 13, so as to facilitate driving, as Figure 1 shown.

[0031] With the continuous operation of the wave simulation mechanism, the fluidity of the sand will cause the platform model body 1 to gradually sink, which is a defect of using sand. To avoid this problem, an anti - settlement mechanism is set in this technical solution.

[0032] Before explaining the working effect of the anti - settlement mechanism, it is necessary to explain the state of the sand. In this process, as the platform model body 1 descends, the sand will be squeezed outwards, that is, the sand on the periphery will increase, and the sand under the platform model body 1 will decrease. In other words, by preventing the sand under the platform model body 1 from being continuously squeezed outwards, that is, increasing the sand under the platform model body 1, the settlement of the platform model body 1 can be effectively prevented. The anti - settlement mechanism in this technical solution just makes use of this point.

[0033] When the anti-settlement mechanism is working, the sand-accumulating strips 14 on the four sides are controlled by the power mechanism 18 to move relatively (so that the sand-accumulating strips 14 approach and move away from each other simultaneously). Since the sand-accumulating strip 14 has a triangular prism structure and the angle between the inner side surface and the bottom surface of the sand-accumulating strip 14 is not less than 90°, when the sand-accumulating strips 14 approach each other, the sand can be pushed towards the middle by the inner side surface of the sand-accumulating strip 14. When the sand-accumulating strips 14 move away from each other, the sand on the periphery can cross the outer inclined surface of the sand-accumulating strip 14 and fill in from the outside to the inside. By circular motion, the sand under the platform model body 1 can be gradually increased, thus effectively preventing the settlement problem.

[0034] To avoid interference and collision between the sand-accumulating strips 14, a baffle 16 is fixed at the outer end of the guide rod 15 (the output end of the corresponding power mechanism 18 can be connected to the baffle 16), so that when the sand-accumulating strips 14 approach to the maximum extent, that is, when the support sleeves 17 block the baffle 16 one by one, the sand-accumulating strips 14 still do not contact each other.

[0035] In this technical solution, the anti-settlement mechanism can not only fill the sand under the platform model body 1. When a single sand-accumulating strip 14 moves independently, the amount of sand on one side can be more and the amount of sand on the other side can be less, that is to say, the sand surface can be inclined to one side, thus effectively simulating the situation where the sea surface is inclined caused by sea tides, big waves, etc., and further increasing the comprehensiveness of the simulation.

[0036] In addition, by blowing air through the air holes 19 on the inner side surface of the sand-accumulating strip 14, the resistance on the inner side surface of the sand-accumulating strip 14 can be reduced, making it easier for the sand-accumulating strip 14 to move. Using this effect, it is possible to facilitate the acceleration of the moving speed of the sand-accumulating strip 14, thus simulating the situation of high-frequency fluctuations of seawater caused by earthquakes, etc.

Claims

1. A semi-submersible offshore platform test simulation device, comprising a platform model body (1), the platform model body (1) includes pontoons (2), columns (3), and a top support plate (4), and grating sensors (5) are arranged on the platform model body (1), characterized in that: There is a bearing box (6) arranged outside the platform model body (1); the bearing box (6) is filled with sand for simulation; a wave simulation mechanism is arranged in the bearing box (6); a settlement prevention mechanism is arranged below the wave simulation mechanism; The described wave simulation mechanism includes transverse slide rails (7) respectively fixed on the front and rear sides of the inner wall of the bearing box (6) along the left - right direction, and longitudinal slide rails (8) respectively fixed on the left and right sides of the inner wall of the bearing box (6) along the front - rear direction; the longitudinal slide rails (8) are arranged below the transverse slide rails (7); a transverse push bar (9) is arranged between the two transverse slide rails (7) along the front - rear direction; a longitudinal push bar (10) is arranged between the two longitudinal slide rails (8) along the left - right direction; both the transverse push bar (9) and the longitudinal push bar (10) are of a convex arc - shaped structure; the front and rear ends of the transverse push bar (9) are respectively fixed with transverse slide bars (11); the left and right ends of the longitudinal push bar (10) are respectively fixed with longitudinal slide bars (12); the transverse slide bars (11) are respectively slidably connected with the corresponding transverse slide rails (7); the longitudinal slide bars (12) are respectively slidably connected with the corresponding longitudinal slide rails (8); the left and right ends of the transverse slide bars (11) respectively slide through the left and right sides of the bearing box (6); the front and rear ends of the longitudinal slide bars (12) respectively slide through the front and rear ends of the bearing box (6); the same - side ends between the two transverse slide bars (11) and the same - side ends between the two longitudinal slide bars (12) are respectively connected by a stop bar (13); The described settlement prevention mechanism includes sand - gathering strips (14) arranged at the bottom of the bearing box (6) and corresponding parallel to the four walls of the bearing box (6); the sand - gathering strips (14) are of a triangular prism - shaped structure and the angle between the inner side surface and the bottom surface of the sand - gathering strips (14) is not less than 90°; a guide rod (15) is fixed on the outer side surface of the sand - gathering strip (14); the guide rod (15) vertically penetrates the corresponding side wall of the bearing box (6); a support sleeve (17) slidably sleeved on the outer side of the guide rod (15) is fixed on the outer wall of the bearing box (6); a baffle (16) is fixed at the outer end of the guide rod (15); when the support sleeves (17) respectively block the baffles (16), the sand - gathering strips (14) do not contact each other; The described transverse push bar (9), longitudinal push bar (10) and sand - gathering strip (14) are respectively linked with an independent power mechanism (18).

2. The semi-submersible offshore platform test simulation device according to claim 1, wherein: The described power mechanism (18) is a hydraulic cylinder.

3. The semi-submersible offshore platform test simulation device according to claim 1, characterized in that: The described power mechanism (18) is an electric push rod.

4. A semi-submersible offshore platform test simulation device according to claim 2 or 3, characterized in that: The sand - gathering strip (14) is of a shell - like structure; air holes (19) are distributed on the inner side surface of the sand - gathering strip (14); rubber blocking pieces (20) are respectively covered outside the air holes (19); the upper ends of the rubber blocking pieces (20) are fixed with the sand - gathering strip (14); the sand - gathering strip (14) is connected with an external air source through an air guide pipe (21).

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