Offshore open caisson floating transportation positioning heaving suppression auxiliary device

Abstract

The invention discloses an offshore open caisson floating transportation positioning heaving inhibition auxiliary device, which belongs to the technical field of open caisson foundation construction of bridge engineering under deepwater ocean conditions, and comprises a well periphery heaving plate, a plurality of layered heaving plates and a lifting rod for connecting the well periphery heaving plate and each layered heaving plate, the well periphery heaving plate is arranged at the bottom of the open caisson foundation and is connected with the well bottom floating transportation sealing plate; the distance between the well periphery heaving plate and each layered heaving plate is adjusted through a lifting rod; through holes are formed in the well periphery heaving plate and the layered heaving plates, hole position information of the through holes in the layered heaving plates is generated through a fractal method, and the hole diameters of the through holes in the layered heaving plates are determined through a Fibonacci sequence. According to the device, the heaving phenomenon in the floating transportation-positioning process can be reduced, the stability of a mooring system is improved, and the floating transportation-positioning efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of offshore sinking well floating positioning heave suppression auxiliary device, belong to deep water marine conditions bridge engineering sinking well foundation construction technical field. BACKGROUND

[0002] With the development of cross-sea bridge engineering, deep water foundation gradually becomes one of the key points in the process of bridge design construction, sinking well foundation has large rigidity, high bearing capacity and good structural stability, and is an important foundation type to meet the design requirements of deep water foundation. Sinking well foundation is a kind of deep foundation formed by sinking the structure prefabricated on the ground using its own weight and finally sealing the bottom. After the sinking well structure is prefabricated, the sinking well is usually floated, positioned and bedded by using a mooring system.

[0003] At present, the research on sinking well foundation floating-positioning mainly focuses on inland sinking well foundation, and there is little research on sinking well foundation under marine conditions. Under marine environment, sinking well is affected by wind, wave and current loads during floating-positioning, and the stability of the mooring system is lower than that in inland, accompanied by heave, pitch and roll problems. Large heave will have a great impact on the cable force of the mooring system. In addition, under the action of large rope load, the well wall material is under great stress, which may be damaged and even cause safety hazards. SUMMARY

[0004] The purpose of the present application is to provide a kind of offshore sinking well floating positioning heave suppression auxiliary device, can reduce the heave phenomenon in the process of floating-positioning, improve the stability of mooring system, improve the efficiency of floating-positioning.

[0005] To achieve the above purpose, the present application provides the following technical scheme: In a first aspect, the present application provides a kind of offshore sinking well floating positioning heave suppression auxiliary device, including well perimeter heave plate and several layered heave plates, and lifting rod connecting well perimeter heave plate and each layered heave plate;Well perimeter heave plate is placed at the bottom of sinking well foundation and connected with well bottom floating sealing plate;The distance between well perimeter heave plate and each layered heave plate is adjusted by lifting rod;Through holes are formed in well perimeter heave plate and each layered heave plate, the hole position information of through hole on each layered heave plate is generated by fractal method, and the hole diameter of through hole on each layered heave plate is determined by Fibonacci sequence.

[0006] In combination with the first aspect, further, the layered heave plate includes first layer heave plate, second layer heave plate and third layer heave plate.

[0007] In combination with the first aspect, further, the cross section of sinking well foundation is inverted corner rectangle, and the hole position information of through hole on each layered heave plate generated by fractal method includes: The rectangular region adapted to the rounded rectangular section of the caisson foundation of each layered heave plate is divided into four first-level sub-rectangular regions along the mid-perpendiculars of the edges of the rectangular region, and a through hole is arranged at the geometric center of each first-level sub-rectangular region; The first-level sub-rectangular region is divided into four second-level sub-rectangular regions along the mid-perpendiculars of the edges of the first-level sub-rectangular region, and a through hole is arranged at the geometric center of each second-level sub-rectangular region; The second-level sub-rectangular region is divided into four third-level sub-rectangular regions along the mid-perpendiculars of the edges of the second-level sub-rectangular region, and a through hole is arranged at the geometric center of each third-level sub-rectangular region.

[0008] In combination with the first aspect, further, the lifting rod is composed of a plurality of sleeves with different diameters.

[0009] In combination with the first aspect, further, the well heave plate, each layered heave plate and the lifting rod are steel structures.

[0010] In combination with the first aspect, further, the well heave plate, each layered heave plate and the lifting rod are coated with graphene modified paint as a protective layer.

[0011] The second aspect provides a sea caisson floating positioning heave suppression method, which is implemented by using the sea caisson floating positioning heave suppression auxiliary device of the first aspect, and the method comprises the following steps: In the floating stage, the lifting rod is retracted, and the well heave plate and each layered heave plate are stacked in sequence; In the positioning stage, the spacing between the well heave plate and each layered heave plate is adjusted by the lifting rod according to the actual situation of wind, wave and current; After the positioning operation is completed, the sea caisson floating positioning heave suppression auxiliary device is removed.

[0012] In combination with the second aspect, further, the method further comprises the following steps before the positioning stage: Based on the water tank test and numerical simulation experiment, the heave plate spacing distribution suggestion of the actual sea area under different wind, wave and current conditions is obtained, and the spacing between the well heave plate and each layered heave plate is adjusted by the lifting rod according to the heave plate spacing distribution suggestion.

[0013] Compared with the prior art, the present application has the following advantages: The offshore sinking well floating positioning heaving suppression auxiliary device provided by the application can increase the water dynamic damping of the sinking well under the action of waves, effectively consume heaving motion energy, and thus reduce the heaving amplitude of the sinking well in the positioning stage. The reduction of heaving motion directly reduces the dynamic tension and impact load of the mooring anchor cable coupled therewith, can improve the stability and reliability of the entire mooring system in complex sea conditions, and reduce the risk of anchor failure or structural damage caused by excessive cable force. Stable motion state can reduce the dynamic water pressure and unbalanced load acting on the sinking well wall, which is beneficial to avoiding stress exceeding the standard or fatigue damage of the sinking well structure in the sensitive construction stage, and ensures the safety of the foundation structure. The spacing between the layers of heaving plates can be adjusted in real time through the lifting rod, which can change the overall performance of the damping system, so that the device can flexibly adapt to different wind, wave and current combined working conditions, realize the upgrade from "fixed damping" to "adjustable damping", and expand the applicable environment range of the device. The through holes on the layered heaving plates are arranged by using a fractal method and the hole diameters are determined according to the Fibonacci sequence. This design creates a multi-scale turbulent dissipation effect, which can provide efficient damping while optimizing the stress state of the plate body itself and reducing unnecessary static water resistance, achieving the best balance between damping efficiency and fluid dynamic performance. The surfaces of the components are coated with a graphene modified waterproof layer, which has excellent corrosion resistance, wear resistance and weather resistance, can effectively resist seawater corrosion, marine organism attachment and construction wear, and prolong the service life and maintenance period of the device in harsh marine environments. The device is installed, operated and removed as an independent auxiliary module, and can be conveniently removed as a whole after the sinking well positioning is completed and used in subsequent engineering, improving the utilization rate and engineering economy of the equipment.

[0014] The offshore sinking well floating positioning heaving suppression method provided by the application designs two working modes of "floating and folding" and "positioning and unfolding". In the floating stage, the plate bodies are folded and overlapped, which can reduce the sailing resistance and towing risk; in the positioning stage, the plate bodies are unfolded and work, and focus on providing damping to suppress vibration. This design realizes the optimal performance in the whole process. The method also emphasizes that water tank test and numerical simulation should be carried out before engineering application, and the optimized adjustment scheme under different sea conditions is obtained in advance. This provides scientific and data-based decision support for on-site construction, which helps to shorten the on-site debugging time, improve the one-time success rate and overall efficiency of positioning operation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of the offshore sinking well floating positioning heaving suppression auxiliary device provided by the embodiment of the application; Figure 2 is a structural schematic view of the heaving plate around the well provided by the embodiment of the application; Figure 3 is a structural schematic view of the first layer of heaving plates provided by the embodiment of the application; Figure 4 is a structural schematic diagram of a second layer of a heave plate provided by an embodiment of the present application; Figure 5 is a structural schematic diagram of a third layer of a heave plate provided by an embodiment of the present application; Figure 6 is a structural schematic diagram of a lifting rod provided by an embodiment of the present application; Figure 7 is a structural schematic diagram of a caisson foundation provided by an embodiment of the present application; In the figure: 1, first layer of heave plate; 11, first through hole; 12, second through hole; 13, third through hole; 2, second layer of heave plate; 21, fourth through hole; 22, fifth through hole; 23, sixth through hole; 3, third layer of heave plate; 31, seventh through hole; 32, eighth through hole; 33, ninth through hole; 4, heave plate around the well; 5, lifting rod; 6, caisson foundation. DETAILED DESCRIPTION

[0016] The technical solutions of the present application will be further described in detail below in combination with specific embodiments.

[0017] Embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application. The technical features in the embodiments of the present application and the embodiments can be combined with each other without conflict.

[0018] The present application provides a sea caisson floating positioning heave suppression auxiliary device, as shown in Figure 1 , which comprises a heave plate 4 around the well and a plurality of layered heave plates, and a lifting rod 5 connecting the heave plate 4 around the well and each layered heave plate; the heave plate 4 around the well is placed at the bottom of the caisson foundation 6 and connected with the well bottom floating sealing plate; the distance between the heave plate 4 around the well and each layered heave plate is adjusted by the lifting rod 5; through holes are provided on the heave plate 4 around the well and each layered heave plate, the hole position information of the through holes on each layered heave plate is generated by a fractal method, and the hole diameter of the through holes on each layered heave plate is determined by a Fibonacci sequence.

[0019] The sea caisson floating positioning heave suppression auxiliary device provided by the embodiment of the present application can solve the heave control problem faced by the caisson floating positioning in the marine strong wind and wave environment, and has made substantial progress in improving construction safety, adapting to complex sea conditions, optimizing engineering cost and efficiency, etc.

[0020] In one possible embodiment, as shown in Figure 1 , the layered heave plate comprises a first layer of heave plate 1, a second layer of heave plate 2 and a third layer of heave plate 3.

[0021] Specifically, as shown in Figure 1 , the cross section of the caisson foundation 6 is a rounded rectangle. As shown in Figure 2 , the well perimeter heave plate 4 is a rounded rectangular structure that matches the rounded rectangular cross section of the caisson foundation 6, and 2 rows of through holes are symmetrically provided on the well perimeter heave plate 4 around the caisson foundation 6.

[0022] In this embodiment, the hole position information of the through holes on each layered heave plate generated by the fractal method specifically includes the following steps: Step 1: Divide the rectangular region that matches the rounded rectangular cross section of the caisson foundation 6 of each layered heave plate into four congruent first-level sub-rectangular regions along the mid-perpendiculars of its edges, and arrange through holes at the geometric centers of each first-level sub-rectangular region; Step 2: Divide the first-level sub-rectangular region into four congruent second-level sub-rectangular regions along the mid-perpendiculars of its edges, and arrange through holes at the geometric centers of each second-level sub-rectangular region; Step 3: Divide the second-level sub-rectangular region into four congruent third-level sub-rectangular regions along the mid-perpendiculars of its edges, and arrange through holes at the geometric centers of each third-level sub-rectangular region.

[0023] Specifically, as shown in Figure 3 , the hole position information of the through holes on the first layer heave plate 1 generated by the fractal method specifically includes the following steps: Step 1: Divide the rectangular region that matches the rounded rectangular cross section of the caisson foundation 6 of the first layer heave plate 1 into four congruent first-level sub-rectangular regions along the mid-perpendiculars of its edges, and arrange first through holes 11 at the geometric centers of each first-level sub-rectangular region; Step 2: Divide the first-level sub-rectangular region into four congruent second-level sub-rectangular regions along the mid-perpendiculars of its edges, and arrange second through holes 12 at the geometric centers of each second-level sub-rectangular region; Step 3: Divide the second-level sub-rectangular region into four congruent third-level sub-rectangular regions along the mid-perpendiculars of its edges, and arrange third through holes 13 at the geometric centers of each third-level sub-rectangular region.

[0024] In this embodiment, the hole diameters of the first through holes 11, the second through holes 12, the third through holes 13, the fourth through holes 21, the fifth through holes 22, the sixth through holes 23, the seventh through holes 31, the eighth through holes 32, and the ninth through holes 33 are in the ratio of 13:8:5:8:5:3:5:3:2.

[0025] As shown in Figure 4 , the hole position information of the through holes on the second layer heave plate 2 generated by the fractal method specifically includes the following steps: Step 1: The rectangular region of the second layer of heave plate 2 that is adapted to the rounded rectangular section of the caisson foundation 6 is divided into four congruent first-level sub-rectangular regions along the midlines of the edges of the rectangular region, and a fourth through-hole 21 is arranged at the geometric center of each first-level sub-rectangular region. Step 2: The first-level sub-rectangular region is divided into four congruent second-level sub-rectangular regions along the midlines of the edges of the first-level sub-rectangular region, and a fifth through-hole 22 is arranged at the geometric center of each second-level sub-rectangular region. Step 3: The second-level sub-rectangular region is divided into four congruent third-level sub-rectangular regions along the midlines of the edges of the second-level sub-rectangular region, and a sixth through-hole 23 is arranged at the geometric center of each third-level sub-rectangular region.

[0026] As shown in Figure 5 the hole position information of the through-holes on the third layer of heave plate 3 generated by the fractal method specifically includes the following steps: Step 1: The rectangular region of the first layer of heave plate 1 that is adapted to the rounded rectangular section of the caisson foundation 6 is divided into four congruent first-level sub-rectangular regions along the midlines of the edges of the rectangular region, and a seventh through-hole 31 is arranged at the geometric center of each first-level sub-rectangular region. Step 2: The first-level sub-rectangular region is divided into four congruent second-level sub-rectangular regions along the midlines of the edges of the first-level sub-rectangular region, and an eighth through-hole 32 is arranged at the geometric center of each second-level sub-rectangular region. Step 3: The second-level sub-rectangular region is divided into four congruent third-level sub-rectangular regions along the midlines of the edges of the second-level sub-rectangular region, and a ninth through-hole 33 is arranged at the geometric center of each third-level sub-rectangular region.

[0027] In one possible embodiment, the lifting rod 5 is composed of a plurality of sleeve connections with different diameters.

[0028] Specifically, as shown in Figure 6 the lifting rod 5 is composed of a first sleeve 51 and a second sleeve 52, and by adjusting the relative position between the first sleeve 51 and the second sleeve 51, the extension and retraction of the lifting rod 5 is realized, and further the spacing adjustment between the well circumference heave plate 4 and the layered heave plates is realized.

[0029] In one possible embodiment, the well circumference heave plate 4, the layered heave plates, and the lifting rod 5 are all steel structures.

[0030] In one possible embodiment, the well circumference heave plate 4, the layered heave plates, and the lifting rod 5 are all coated with graphene modified paint as a protective layer.

[0031] The offshore sinking well floating positioning heaving suppression auxiliary device provided by the embodiment of the present application considers the different stage requirements in the floating and positioning process, reduces the heaving as much as possible under the condition of not affecting the floating, and designs the adjustable layered heaving plate in view of the variable characteristics of the wind, wave and current of the marine environment, so that the applicable environment range of the heaving suppression auxiliary device is expanded. Meanwhile, the graphene modified paint is used as the protective layer, which has the characteristics of corrosion resistance and strong weather resistance, and is suitable for the marine construction operation characteristics.

[0032] The embodiment of the present application provides a heaving suppression method for offshore sinking well floating positioning, which is implemented by using the offshore sinking well floating positioning heaving suppression auxiliary device provided by the embodiment of the present application, and the method specifically comprises the following steps: Step 1: in the floating stage, the lifting rod 5 is retracted, and the well peripheral heaving plate 4 and each layered heaving plate are stacked in turn; Step 2: in the positioning stage, according to the actual situation of wind, wave and current, the spacing between the well peripheral heaving plate 4 and each layered heaving plate is adjusted through the lifting rod 5; Step 3: after the positioning operation is completed, the offshore sinking well floating positioning heaving suppression auxiliary device is removed.

[0033] In one possible embodiment, before the positioning stage, the following steps are further included: Based on the water tank test and numerical simulation experiment, the heaving plate spacing distribution suggestion of the actual sea area under different wind, wave and current conditions is obtained, and the spacing between the well peripheral heaving plate 4 and each layered heaving plate is adjusted through the lifting rod 5 according to the heaving plate spacing distribution suggestion.

[0034] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be regarded as the protection range of the present application.

Claims

1. A floating positioning and heave suppression auxiliary device for offshore caissons, characterized in that, It includes a circumferential sway plate (4) and several layered sway plates, as well as lifting rods (5) connecting the circumferential sway plate (4) and each layered sway plate; the circumferential sway plate (4) is placed at the bottom of the caisson foundation (6) and connected to the bottom floating sealing plate; the spacing between the circumferential sway plate (4) and each layered sway plate is adjusted by the lifting rods (5); through holes are provided on the circumferential sway plate (4) and each layered sway plate, the hole position information of the through holes on each layered sway plate is generated by the fractal method, and the hole diameter of the through holes on each layered sway plate is determined by the Fibonacci sequence.

2. The offshore caisson floating positioning heave suppression auxiliary device according to claim 1, characterized in that, The layered heave plate includes a first layer heave plate (1), a second layer heave plate (2), and a third layer heave plate (3).

3. The offshore caisson floating positioning heave suppression auxiliary device according to claim 1, characterized in that, The cross-section of the caisson foundation (6) is a rounded rectangle. The hole location information of the through holes on each layer of the slab is generated by fractal method, including: The rectangular area that is compatible with the rounded rectangular section of the caisson foundation (6) of each layer of sloping plate is divided into four equal first-level sub-rectangular areas along the perpendicular bisector of each side, and through holes are arranged at the geometric center of each first-level sub-rectangular area. The first-level sub-rectangular region is divided into four congruent second-level sub-rectangular regions along the perpendicular bisectors of each side, and through holes are arranged at the geometric center of each second-level sub-rectangular region. The second-level sub-rectangular region is divided into four congruent third-level sub-rectangular regions along the perpendicular bisectors of each side, and through holes are arranged at the geometric center of each third-level sub-rectangular region.

4. The offshore caisson floating positioning heave suppression auxiliary device according to claim 1, characterized in that, The lifting rod (5) is composed of several sleeves of different diameters connected together.

5. The offshore caisson floating positioning heave suppression auxiliary device according to claim 1, characterized in that, The well perimeter sway plate (4), each layer of sway plate and the lifting rod (5) are all steel structures.

6. The offshore caisson floating positioning heave suppression auxiliary device according to claim 1, characterized in that, The wellbore oscillation plate (4), each layer of oscillation plate and the lifting rod (5) are all coated with graphene-modified coating as a protective layer.

7. A method for suppressing heave during floating and positioning of a marine caisson, implemented using the auxiliary device for suppressing heave during floating and positioning of a marine caisson as described in any one of claims 1 to 6, characterized in that the method... include: During the floating phase, the lifting rod (5) is retracted, so that the well perimeter sway plate (4) and each layer of sway plate are stacked in sequence. During the positioning phase, the well perimeter sway plate (4) and the spacing between each layer of sway plate are adjusted by lifting rod (5) according to the actual situation of wind, waves and flow on site. After completing the positioning operation, the floating positioning heave suppression auxiliary device for the offshore caisson is removed.

8. The method for suppressing heave during floating and positioning of a marine caisson according to claim 7, characterized in that, Prior to the positioning phase, it also includes: Based on flume tests and numerical simulation experiments, suggestions for the distribution of heave plate spacing under different wind, wave and current conditions in actual sea areas are obtained. Based on the suggestions for the distribution of heave plate spacing, the spacing between the heave plates around the well (4) and between each layer of heave plates is adjusted by the lifting rod (5).

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