Reinforcing mechanism for auxiliary lattice of cofferdam

Abstract

The invention relates to the technical field of cofferdams, and discloses a cofferdam auxiliary lattice reinforcing mechanism which is mounted on a cofferdam, the cofferdam comprises two cylindrical main lattices, a first arc auxiliary lattice, a second arc auxiliary lattice and a filling body, the first arc auxiliary lattice and the second arc auxiliary lattice are connected between the two cylindrical main lattices, and the filling body is filled between the first arc auxiliary lattice and the second arc auxiliary lattice. The reinforcing mechanism comprises a conduction device, the two ends of the conduction device are connected to the side walls of the two cylindrical main grids respectively, the conduction device is arranged between the filling body and the first arc auxiliary grid or the second arc auxiliary grid and provided with a first stress side and a second stress side which are opposite in direction, the first stress side is connected with the filling body, and the second stress side is connected with the second arc auxiliary grid. The second stress side is connected with the first arc secondary grid or the second arc secondary grid; when the first arc auxiliary grid or the second arc auxiliary grid bears an external load, the external load can be transmitted to the cylindrical main grid through the transmission device, and meanwhile, the filling body applies pressure opposite to the external load to the first stress side. The cofferdam has the advantage that the overall strength of the cofferdam can be improved.

Description

Technical Field

[0001] This invention relates to the field of cofferdam technology, and more particularly to a reinforcing mechanism for a cofferdam sub-grid. Background Technology

[0002] In the fields of port engineering and offshore artificial island construction, the rapid land reclamation technology using ultra-large diameter steel cylindrical cofferdams has become a key land reclamation process widely used in recent years due to its significant advantages such as short construction cycle, high degree of mechanization, and minimal environmental impact. This technology involves prefabricating ultra-large diameter steel cylindrical main cells and connecting arc-shaped steel plate sub-cells in a factory, then forming a closed water-retaining structure on-site through vibration sinking and splicing, followed by internal sand filling to achieve rapid land reclamation. However, in practical engineering applications, the problem of uneven structural stress is becoming increasingly prominent. The steel cylindrical main cells, due to their integral cylindrical structure, possess high circumferential stiffness and deformation resistance, effectively resisting external loads such as wind, waves, and water flow. However, the arc-shaped steel plate sub-cells connecting adjacent main cells are typically composed of thin steel plates with single curvature, resulting in relatively low lateral stiffness and weak resistance to lateral loads. Particularly noteworthy is that the arc-shaped sub-cells located on the seaward side are directly subjected to complex marine loads such as wave impact and tidal pressure over long periods, making them highly susceptible to local buckling, weld cracking, and even overall failure. Once the sea-side arc sub-cell is damaged, the water-stopping function of the cofferdam will be severely impaired, causing seawater to continuously seep into the internal reclamation area, leading to the loss of reclamation sand, liquefaction or softening of the foundation. This will not only interrupt the subsequent construction process, but may also induce a chain of safety risks such as uneven settlement of the main cell foundation and structural tilting, seriously affecting the project progress and overall structural stability.

[0003] To address this, existing technology discloses a repair structure for a damaged secondary grid. This structure uses an external retaining wall composed of U-shaped steel sheet piles and limiting beams on the land side of the damaged secondary grid, replacing the damaged secondary grid itself. However, in this structure, the U-shaped steel sheet piles and limiting beams are installed on the arc-shaped secondary grid, and the force ultimately needs to be transferred to the main grid through the secondary grid, failing to change the essential nature of the secondary grid as a primary load-bearing component. Under continuous large wind and wave loads, the secondary grid and the repair structure connected to it will still suffer cumulative damage and secondary failure, making it difficult to guarantee the reliability of its water-stopping mechanism and the long-term stability of the structure. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to propose a strengthening mechanism for the cofferdam sub-grid that can improve the overall strength of the cofferdam.

[0005] The technical solution adopted by the present invention to solve its technical problem is to provide a reinforcing mechanism for a cofferdam sub-cell, which is installed on the cofferdam. The cofferdam includes at least two spaced cylindrical main cells, a first arc sub-cell and a second arc sub-cell connected between the two cylindrical main cells, and a filling body filling the space between the first arc sub-cell and the second arc sub-cell. The reinforcing mechanism includes a conducting device, the two ends of which are respectively connected to the side walls of the two cylindrical main cells. The conducting device is disposed between the filling body and the first arc sub-cell or the second arc sub-cell, and has a first force-bearing side and a second force-bearing side facing opposite directions. The first force-bearing side is connected to the filling body, and the second force-bearing side is connected to the first arc sub-cell or the second arc sub-cell. When the first arc sub-cell or the second arc sub-cell is subjected to an external load, the external load can be transmitted to the cylindrical main cells through the conducting device. At the same time, the filling body applies a pressure opposite to the external load to the first force-bearing side.

[0006] In the aforementioned reinforcement mechanism for a cofferdam sub-cell, the transmission device includes an isolation component and a transmission component. The isolation component is disposed between the transmission component and the filling body and abuts against the filling body. The transmission component is disposed on the side of the isolation component away from the filling body and is connected to the first arc sub-cell. The isolation component can restrict the filling body from contacting the transmission component. The first force-bearing side is located on the isolation component, and the second force-bearing side is located on the transmission component.

[0007] In the aforementioned reinforcement mechanism of a cofferdam sub-grid, the transmission component includes a first connecting structure, a first buffer structure, and a second connecting structure. The first connecting structure is arranged horizontally, and its side away from the first buffer structure is movably connected to the isolation component. The side of the second connecting structure away from the first buffer structure is connected to the first arc sub-grid. The first buffer structure is telescopically disposed between the first connecting structure and the second connecting structure.

[0008] In the aforementioned reinforcement mechanism of a cofferdam sub-grid, the first buffer structure includes a first contraction rod, a second contraction rod, and a buffer member. One end of the first contraction rod is hinged to the first connecting structure, and the other end is retractably connected to the buffer member. One end of the second contraction rod is hinged to the second connecting structure, and the other end is retractably connected to the buffer member. The buffer member has an elastic deformation.

[0009] In the aforementioned reinforcement mechanism for a cofferdam sub-grid, multiple first buffer structures are provided and arranged along the length of the first connecting structure. Each buffer component of the multiple first buffer structures is provided with a accommodating cavity containing a built-in lubricating medium, and the multiple accommodating cavities are connected through an adjusting pipe, allowing the lubricating medium to flow between the multiple accommodating cavities through the adjusting pipe.

[0010] In the aforementioned reinforcement mechanism of a cofferdam sub-grid, the buffer member is in the shape of a hollow cylinder, and the first and second retractable rods are respectively telescopically sleeved inside the buffer member. The buffer member includes an inner layer and an outer layer, the inner layer being a rubber layer and the outer layer being an anti-corrosion layer.

[0011] In the aforementioned reinforcement mechanism for a cofferdam sub-grid, the first connecting structure is provided in at least two sets, which are arranged at intervals along the height direction of the isolation component, and multiple movable rods are movably arranged at intervals between the two sets of the first connecting structures. The movable rods correspond one-to-one with the first buffer structure and are hinged to the first buffer structure.

[0012] In the aforementioned reinforcement mechanism for a cofferdam sub-grid, the isolation component includes an isolation plate and multiple adjusting blocks. The isolation plate is disposed between the first connecting structure and the filling body, and the multiple adjusting blocks are disposed on the side of the isolation plate facing the first connecting structure. Each adjusting block is correspondingly inserted between two adjacent moving rods, and the cross-sectional area of ​​each adjusting block gradually increases along the direction closer to the filling body.

[0013] In the above-mentioned reinforcement mechanism of a cofferdam sub-cell, the isolation plate includes a first baffle and a second baffle. The first baffle is arranged vertically and abuts against the filling body, and the adjustment block is disposed on the first baffle. The second baffle is arranged horizontally above the first baffle and is vertically connected to the first baffle. The second baffle extends toward the first arc sub-cell and covers the first arc sub-cell.

[0014] In the aforementioned reinforcement mechanism of a cofferdam sub-cell, the transmission device includes at least two second buffer structures located at both ends of the first connecting structure. The first connecting structure is movably connected to the isolation component through the second buffer structures and can move towards or away from the filling body. The two second buffer structures are respectively connected to the sidewalls of the two cylindrical main cells on the side away from the first buffer structure.

[0015] In the aforementioned reinforcement mechanism of a cofferdam sub-cell, the second buffer structure includes a fixed seat, a guide rod, and an elastic element. The fixed seat is fixedly connected to the cylindrical main cell and has a movable groove. The guide rod is disposed in the movable groove. The elastic element is telescopically disposed on the guide rod. Both ends of the first connecting structure are movably sleeved on the guide rod and abut against the elastic element.

[0016] In the aforementioned reinforcement mechanism for a cofferdam sub-grid, multiple second connecting structures are provided, fixedly disposed on the side of the first arc sub-grid facing the second arc sub-grid, and spaced apart along the length direction of the first arc sub-grid. Each second connecting structure is arranged vertically and extends along the height direction of the first arc sub-grid.

[0017] In the aforementioned reinforcement mechanism for a cofferdam sub-grid, each of the second connecting structures is provided with a first hinge seat on the side opposite to the first arc sub-grid, and the second connecting structure is hinged to the first buffer structure through the first hinge seat.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. In this invention, by setting a transmission device with its two ends connected to two cylindrical main cells respectively, and configuring it between the infill and the first or second circular arc sub-cell, it has a first force-bearing side and a second force-bearing side facing opposite directions. The first force-bearing side is connected to the infill and the second force-bearing side is connected to the circular arc sub-cell, thereby constructing an efficient force flow transmission path. When the sub-cell is subjected to external impact load, the external load can be directly transmitted to the robust cylindrical main cell through the transmission device. At the same time, the infill applies reverse pressure to the first force-bearing side of the transmission device, forming a "push-pull" two-way mechanical balance, thereby significantly improving the deformation resistance of the sub-cell and the overall stability of the cofferdam, and fundamentally avoiding buckling failure of the sub-cell.

[0020] 2. In this invention, the conduction device adopts a separate design of isolation component and conduction component. The isolation component abuts against the filling body and is used to bear the pressure on the first force-bearing side. The conduction component is located on the side of the isolation component away from the filling body and is connected to the sub-cell to bear the external load on the second force-bearing side. The two are physically isolated by the isolation component, which effectively prevents moisture and corrosive media in the filling body from invading the conduction component, avoids electrochemical corrosion, blockage or adhesion failure, significantly improves the durability and maintainability of the conduction component, and extends the overall service life of the cofferdam.

[0021] 3. In this invention, the conductive component includes a first connecting structure, a first buffer structure, and a second connecting structure. The first connecting structure is horizontally arranged, and its side facing away from the first buffer structure is movably connected to an isolation component. The second connecting structure's side facing away from the first buffer structure is connected to a first arc sub-grid. The first buffer structure is retractably positioned between the first and second connecting structures. This design enables the conductive component to possess both rigid support and flexible buffering functions, forming a synergistic force-bearing system. Simultaneously, the movable connection between the first connecting structure and the isolation component, combined with the retractable capability of the first buffer structure, constitutes a two-stage buffering mechanism, significantly enhancing the system's adaptability to dynamic loads and structural deformation.

[0022] 4. In this invention, the first buffer structure includes a first retractable rod, a second retractable rod, and a buffer member. One end of the first retractable rod is hinged to a first connecting structure, and the other end is retractably connected to the buffer member. One end of the second retractable rod is hinged to a second connecting structure, and the other end is retractably connected to the buffer member. The buffer member has elastic deformation. This design allows the first buffer structure to adapt its attitude by rotating through the hinged joint when the arc subgrid undergoes arc bending or slight torsion under the impact of waves, effectively avoiding stress concentration, jamming, or structural damage caused by rigid connections.

[0023] 5. In this invention, multiple first buffer structures are arranged along the length of the first connecting structure. Each buffer component of the multiple first buffer structures has a cavity with a built-in lubricating medium, and the multiple cavities are connected by an adjusting pipe, allowing the lubricating medium to flow between the multiple cavities through the adjusting pipe. This design integrates multiple buffer components into a linked hydraulic or pneumatic adjusting system, enabling each buffer unit to respond collaboratively to external loads, achieving pressure balance, efficient energy absorption, and intelligent load adaptation. This not only improves the overall buffering performance of the system but also facilitates later maintenance and condition monitoring, significantly enhancing the stability and reliability of the cofferdam in complex marine dynamic environments, and further ensuring the stability of the ultra-large diameter steel cylindrical cofferdam sub-cell. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the reinforcement mechanism of the present invention installed on the cofferdam.

[0025] Figure 2 for Figure 1 Sectional view at point AA.

[0026] Figure 3 for Figure 1 A structural diagram from another perspective.

[0027] Figure 4 This is a schematic diagram of the structure after hiding the isolation components.

[0028] Figure 5This is a schematic diagram of the conductive device in this invention.

[0029] Figure 6 This is a schematic diagram of the structure connecting the conductive component to the first circular arc subgrid in this invention.

[0030] Figure 7 This is a schematic diagram of the conductive component in this invention.

[0031] Figure 8 This is an exploded view of the conductive component in this invention.

[0032] Figure 9 This is a schematic diagram of the first buffer structure in this invention.

[0033] Figure 10 This is an exploded view of a partial structure of the conductive device of the present invention.

[0034] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0035] 100. Cylindrical main cell; 200. First arc sub-cell; 300. Second arc sub-cell; 400. Filler; 500. Conducting component; 510. First connecting structure; 511. Sliding groove; 520. First buffer structure; 521. First contraction rod; 522. Second contraction rod; 523. Buffer component; 524. Adjusting pipe; 530. Second connecting structure; 531. First hinge seat; 540. Moving rod; 541. Second hinge seat; 600. Isolation component; 610. Isolation plate; 611. First baffle; 612. Second baffle; 620. Adjusting block; 700. Second buffer structure; 710. Fixed seat; 711. Moving groove; 720. Guide rod; 730. Elastic component. Detailed Implementation

[0036] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0041] like Figures 1 to 10 As shown, in this embodiment, a reinforcing mechanism for a cofferdam sub-grid is installed on the cofferdam. The cofferdam includes at least two spaced cylindrical main grids 100, a first arc sub-grid 200 and a second arc sub-grid 300 connected between the two cylindrical main grids 100, and a filler 400 filling the space between the first arc sub-grid 200 and the second arc sub-grid 300. The reinforcing mechanism includes a transmission device, the two ends of which are respectively connected to the side walls of the two cylindrical main cells 100. The transmission device is disposed between the filler 400 and the first arc sub-cell 200 or the second arc sub-cell 300, and has a first force-bearing side and a second force-bearing side facing opposite directions. The first force-bearing side is connected to the filler 400, and the second force-bearing side is connected to the first arc sub-cell 200 or the second arc sub-cell 300. When the first arc sub-cell 200 or the second arc sub-cell 300 is subjected to an external load, the external load can be transmitted to the cylindrical main cells 100 through the transmission device. At the same time, the filler 400 applies a pressure opposite to the external load to the first force-bearing side. This design allows the external impact load to be directly transmitted to the robust cylindrical main cell 100 through the transmission device when the sub-cell is subjected to it. At the same time, the filler 400 applies reverse pressure to the first force-bearing side of the transmission device, forming a "push-pull" two-way mechanical balance, which significantly improves the deformation resistance of the sub-cell and the overall stability of the cofferdam, fundamentally preventing buckling failure of the sub-cell.

[0042] Specifically, such as Figures 1 to 10 As shown, in this embodiment, the cofferdam includes two cylindrical main cells 100 of equal diameter arranged at intervals, a first arc-shaped secondary cell 200 and a second arc-shaped secondary cell 300 connected between the two cylindrical main cells 100, and a filling body 400 filling the space between the first arc-shaped secondary cell 200 and the second arc-shaped secondary cell 300. The first arc-shaped secondary cell 200 and the second arc-shaped secondary cell 300 are both arc-shaped steel plate structures, extending circumferentially and respectively connected between the corresponding side walls of the two cylindrical main cells 100, together forming an internal cavity. The filling body 400 is located within the cavity, and the top elevation of the filling body 400 matches the top elevation of the arc-shaped secondary cell.

[0043] Furthermore, the filler 400 is a material with self-compacting properties and a certain lateral compressive strength, such as dredged sand, gravel mixture, crushed stone soil, or solidified cement soil. It is filled by hydraulic filling or mechanical backfilling during the construction of the cofferdam to form a land foundation, balance the internal and external water and soil pressures, and enhance the overall stability of the cofferdam.

[0044] Furthermore, the first circular arc sub-cell 200 is located on the seaward side (i.e., near-shore side) of the cofferdam, directly facing the open sea environment. It is subjected to complex external loads such as periodic wave impacts, water flow scouring, tidal changes, and possible impacts from floating objects over a long period of time. Due to its structural form of thin-walled arc-shaped steel plate, large lateral span, relatively low out-of-plane stiffness, and concentrated stress at the connection nodes, it is prone to structural damage such as local bulging, buckling deformation, weld cracking, and even overall instability under dynamic loads, becoming a weak mechanical link in the cofferdam system.

[0045] To improve the overall strength of the cofferdam, a reinforcing mechanism installed in the arc-shaped sub-grid area is provided in this embodiment. This reinforcing structure includes a transmission device, which, as a core load-bearing component, is positioned between the arc-shaped sub-grid of the cofferdam and the internal filling 400 to achieve effective transmission of external loads and synergistic utilization of internal pressure.

[0046] Furthermore, the two ends of the transmission device are fixedly connected to the side walls of the two cylindrical main cells 100, protruding outwards radially along the cofferdam and spanning the connection area between the two cylindrical main cells 100, forming a continuous transverse force transmission path. This force transmission path passes through the space occupied by the first circular arc sub-cell 200 or the second circular arc sub-cell 300, achieving effective structural reinforcement of the sub-cell area.

[0047] Furthermore, the conductive device can be disposed in any arc-shaped sub-cell area, including the space between the first arc-shaped sub-cell 200 or the second arc-shaped sub-cell 300 and its corresponding infill body 400. Preferably, the conductive device is installed in the area of ​​the first arc-shaped sub-cell 200. This is to specifically enhance the load-bearing capacity and anti-interference performance of weak parts, and to fully utilize its structural reinforcement function.

[0048] Furthermore, the transmission device has two force-bearing sides facing opposite directions: the first force-bearing side faces and abuts against the filler 400, and is used to withstand the lateral pressure generated by the filler 400 during the consolidation process; the second force-bearing side faces and abuts against the first arc sub-cell 200, and is used to receive the force transmitted by the first arc sub-cell 200 under the action of external environmental loads (such as wave impact, water flow pressure).

[0049] In actual operation, when an external load is applied to the first arc-shaped sub-cell 200, the load is introduced into the transmission device through the second force-bearing side and then transmitted laterally through its overall structure to the two cylindrical main cells 100 with higher stiffness on both sides. This achieves efficient load transfer and dispersion, preventing stress concentration in the middle of the sub-cell. Simultaneously, the internal filling 400 continuously applies lateral pressure in the opposite direction to the first force-bearing side, forming a two-way mechanical balance mechanism of "outward pushing and inward pressing." This synergistic effect not only significantly improves the stress stability of the transmission device itself but also places the sub-cell area in a pre-compression constrained state, effectively suppressing its outward convex deformation tendency under external loads, thereby enhancing the overall structural stiffness, deformation resistance, and long-term service reliability of the cofferdam.

[0050] In this embodiment, the conduction device includes an isolation component 600 and a conduction component 500, which together form a modular and functionally differentiated integrated structure. The isolation component 600 is disposed between the conduction component 500 and the filler 400, and abuts against the filler 400 to withstand lateral pressure from the filler 400. The conduction component 500 is disposed on the side of the isolation component 600 opposite to the filler 400 and is connected to the first arc sub-grid 200 to transmit external environmental loads. The isolation component 600 also restricts contact between the filler 400 and the conduction component 500. The first force-bearing side is located on the isolation component 600, and the second force-bearing side is located on the conduction component 500. By adopting a separate design for the isolation component 600 and the conduction component 500, the conduction component 500 and the filling material 400 are physically isolated by the isolation component 600. This effectively prevents moisture and corrosive media in the filling material 400 from invading the conduction component 500, avoiding electrochemical corrosion, blockage or adhesion failure, significantly improving the durability and maintainability of the conduction component 500, and extending the overall service life of the cofferdam.

[0051] Furthermore, the isolation component 600 includes an isolation plate 610 and multiple adjusting blocks 620, which work together to effectively separate the filler 400 from the conductive component 500, and also have force transmission adjustment and structural adaptation functions. The isolation plate 610 is located between the first connecting structure 510 and the filler 400 to separate the filler 400 from the conductive component 500. The isolation plate 610 includes a first baffle 611 and a second baffle 612. The first baffle 611 is vertically arranged and extends along the height direction of the filler 400, and the side of the first baffle 611 facing away from the first connecting structure 510 abuts against the filler 400. The second baffle 612 is horizontally positioned above the first baffle 611 and vertically connected to it. Together, they form an L-shaped cross-section structure, possessing good bending stiffness and structural stability.

[0052] Furthermore, the second baffle 612 extends along its free end toward the first arc sub-grid 200 and covers it. This design allows the baffle 610 and the first arc sub-grid 200 to form a partially enclosing structure in space, which not only enhances the overall connection between the transmission device and the first arc sub-grid 200, but also significantly expands the contact area between the transmission device and the first arc sub-grid 200, which is beneficial for the uniform transmission of external loads and reduces local stress concentration.

[0053] Furthermore, multiple adjusting blocks 620 are disposed on the side of the isolation plate 610 facing the first connecting structure 510. Specifically, each adjusting block 620 has an L-shaped structure, including a vertical side and a horizontal side that are perpendicularly connected to each other. The vertical side is fixedly attached to the first baffle 611 to transmit lateral pressure; the horizontal side extends horizontally towards the moving rod 540 and is correspondingly inserted between two adjacent moving rods 540, and the cross-sectional area of ​​the horizontal side of each adjusting block 620 gradually increases along the direction towards the filler 400, that is, it has a gradually expanding design. When the filler 400 exerts pressure on the isolation plate 610, the isolation plate 610 can drive the adjusting block 620 to move closer to the moving rod 540. Since the adjusting block 620 has a gradually expanding design, as the adjusting block 620 moves, it can increase the distance between two adjacent sets of moving rods 540. When the adjusting block 620 increases the distance between the two adjacent moving rods 540, the lateral thrust of the filling body 400 can be transmitted to the first buffer structure 520 through the moving rods 540, instead of acting directly on the connection between the first connecting structure 510 and the cylindrical main grid 100, thereby improving the ability of the first arc sub-grid 200 to resist wind and waves.

[0054] In this embodiment, the transmission component 500 includes a first connecting structure 510, a first buffer structure 520, and a second connecting structure 530, which together form a composite force transmission system integrating rigid support and flexible energy dissipation. The first connecting structure 510 is horizontally arranged, and its side facing away from the first buffer structure 520 is movably connected to the isolation plate 610 of the isolation component 600, allowing it to undergo a certain amount of displacement along a predetermined direction under pressure. The second connecting structure 530, its side facing away from the first buffer structure 520, is connected to the inner wall of the first arc sub-grid 200, used to receive external loads and achieve structural anchoring. The first buffer structure 520 is telescopically disposed between the first connecting structure 510 and the second connecting structure 530, capable of axial compression or tensile deformation under external force, achieving energy absorption and stress relief. This design enables the transmission component 500 to possess both rigid support and flexible buffering functions, forming a synergistic force-bearing system. Meanwhile, the movable connection between the first connecting structure 510 and the isolation component 600, combined with the expansion and contraction capability of the first buffer structure 520, constitutes a two-stage buffer mechanism. The first stage adapts to the overall displacement through the movable connection, while the second stage dissipates energy through the deformation of the buffer structure itself. This significantly improves the resilience of the strengthening mechanism to dynamic loads such as wave impact, uneven settlement, and temperature deformation, effectively avoiding stress concentration or structural damage caused by rigid constraints.

[0055] Furthermore, the first connecting structure 510 is rectangular in shape, possessing high bending stiffness and axial load-bearing capacity. To enhance the overall integrity and stress uniformity of the structure in the height direction, at least two sets of first connecting structures 510 are provided, spaced apart along the height direction of the isolation plate 610, located in the upper and lower regions of the first baffle 611, respectively. Among them, the first connecting structure 510 arranged in the lower part has its bottom surface flush with the sea level, which is beneficial for resisting concentrated loads in the near-water area such as wave rise and water erosion, while avoiding stress instability caused by local suspension.

[0056] Furthermore, multiple spaced movable rods 540 are movably provided between the two sets of first connecting structures 510. Each movable rod 540 corresponds to and is hinged to a first buffer structure 520. Specifically, a sliding groove 511 extending along its length is provided on one side of each of the two sets of first connecting structures 510. The multiple movable rods 540 are rectangular rods, with both ends movably inserted into the sliding grooves 511 and able to move along the sliding grooves 511 under the action of the adjusting block 620. These movable rods 540 not only connect the two sets of first connecting structures 510 to form an overall frame, but also allow the position of the first buffer structure 520 to adaptively change with the dynamic adjustment of the second buffer structure 700 as the first connecting structure 510 moves. This ensures that the first buffer structure 520 always maintains a reasonable force angle with the first connecting structure 510 and the second connecting structure 530, avoiding a decrease in force transmission efficiency due to misalignment.

[0057] Furthermore, the moving rod 540 is provided with a second hinge seat 541 on the side facing the first buffer structure 520, and the moving rod 540 is hinged to the first buffer structure 520 through the second hinge seat 541, so that the first buffer structure 520 can rotate around the hinge point, thereby realizing attitude adaptive adjustment.

[0058] Furthermore, both ends of each first connecting structure 510 are movably connected to the first baffle 611 of the isolation component 600 via the second buffer structure 700, and can move towards or away from the filler 400. Preferably, both ends of the first connecting structure 510 are movably sleeved on the guide rod 720 of the second buffer structure 700, and abut against the elastic element 730 on the guide rod 720. This design allows the first connecting structure 510 to undergo controllable displacement in a direction perpendicular to the first arc sub-grid 200 under external load or internal pressure, constituting the first-level buffer mechanism in the multi-level buffer system of the conduction component 500.

[0059] In this embodiment, the first buffer structure 520 includes a first retractable rod 521, a second retractable rod 522, and a buffer member 523. One end of the first retractable rod 521 is hinged to the first connecting structure 510, and the other end is telescopically connected to the buffer member 523. One end of the second retractable rod 522 is hinged to the second connecting structure 530, and the other end is telescopically connected to the buffer member 523. The buffer member 523 has elastic deformation capacity, that is, the buffer member 523 has an elastic medium or a structural unit with elastic deformation capability inside, which can generate compression or rebound deformation under the action of external force. This design enables the first buffer structure 520 to have good posture adaptability. When the first arc sub-grid 200 undergoes arc bending, local bulging, or slight torsion under wave impact, water flow disturbance, or uneven settlement, the first contraction rod 521 and the second contraction rod 522 can rotate freely through the hinge node, while the buffer 523 undergoes axial compression, achieving multi-degree-of-freedom coordinated deformation. This effectively avoids failure modes such as stress concentration, structural jamming, or connection breakage caused by rigid connection, significantly improving the working reliability of the transmission component 500 under complex stress conditions.

[0060] Specifically, when an external instantaneous load (such as a strong wave impact) acts on the first arc sub-grid 200, the load is transmitted to the second contraction rod 522 through the second connecting structure 530, driving it to contract inwards towards the buffer member 523. Simultaneously, the first contraction rod 521 also undergoes relative displacement under the reaction force, and the buffer member 523 is compressed as a whole, absorbing a large amount of impact kinetic energy. When the external load decreases or disappears, the buffer member 523, under the restoring force of its internal elastic medium (such as a pre-compressed spring, compressed gas, or a high-resilience material), pushes the first contraction rod 521 and the second contraction rod 522 back to their original positions, restoring the initial support state and maintaining continuous constraint on the first arc sub-grid 200. The impact force transmission path is: second connecting structure 530 → second contraction rod 522 → buffer member 523 → first contraction rod 521 → moving rod 540 → first connecting structure 510. During this process, the impact energy is gradually attenuated through multiple stages, effectively reducing the risk of fatigue damage to the rigid structure.

[0061] Furthermore, the buffer element 523 provides a sealed protection for the connection area between the first contraction rod 521 and the second contraction rod 522. Preferably, a welded seal, rubber sealing ring, or multi-layer sealing structure is used to isolate the moving joint from the external environment. This design effectively prevents seawater, salt spray, chloride ions, and corrosive gases from penetrating the interior of the buffer element 523, preventing electrochemical corrosion, rusting, jamming, or strength degradation of metal components, thereby significantly extending the service life of the first buffer structure 520 and improving its durability in high-humidity, high-salt marine environments.

[0062] To improve overall load-bearing capacity and response uniformity, multiple first buffer structures 520 are provided, spaced apart along the length of the first connecting structure 510, and corresponding one-to-one with multiple second connecting structures 530. Preferably, two groups are provided, each group containing six first buffer structures 520, evenly distributed along the length of the moving rod 540, forming a multi-point collaborative support system.

[0063] Furthermore, each of the multiple first buffer structures 520 has a buffer element 523 equipped with a cavity containing a built-in lubricating medium, and these cavities are connected by an adjusting pipe 524. The lubricating medium (such as hydraulic oil, inert gas, or a special buffer solution) can flow between the multiple cavities through the adjusting pipe 524. This design integrates multiple buffer elements 523 into a linked hydraulic or pneumatic adjusting system, enabling each buffer unit to respond collaboratively to external loads, achieving pressure balance, efficient energy absorption, and intelligent load adaptation. This not only improves the overall buffering performance of the system but also facilitates subsequent maintenance and condition monitoring, significantly enhancing the stability and reliability of the cofferdam in complex marine dynamic environments, and further ensuring the stability of the ultra-large diameter steel cylindrical cofferdam sub-cell.

[0064] Specifically, regarding dynamic pressure balance: when the internal pressure of a buffer 523 in a certain area increases due to localized load concentration, the lubricating medium automatically flows to the adjacent buffer 523 with lower pressure through the regulating pipe 524, achieving "dynamic diversion" and preventing overload failure of a single buffer 523, significantly improving the overall system's load-bearing capacity and safety margin. Regarding distributed energy absorption: the regulating pipe 524 enables multiple buffers 523 to form a "distributed energy pool." When the first arc sub-grid 200 is impacted, the impact force is transmitted to multiple first buffer structures 520 through the second connecting structure 530. The lubricating medium within each buffer 523 is linked through the regulating pipe 524, jointly bearing and dispersing the impact energy. Regarding intelligent load adaptation: when an external load moves along the length of the first arc sub-grid 200 (e.g., waves moving from left to right), the lubricating medium flows directionally along the regulating pipe 524 with the pressure gradient, driving the corresponding buffer 523 to respond preferentially, achieving an adaptive adjustment mechanism of "where the force is greater, that area is buffered first." This feature ensures that the force transmission path is always distributed along the direction of least resistance and fastest response, reducing energy loss and improving the system response accuracy.

[0065] Furthermore, the buffer component 523 is a hollow cylinder, and the first contraction rod 521 and the second contraction rod 522 are round rods, which are coaxially and telescopically fitted into the guide holes at both ends of the buffer component 523 to form a stable sliding fit. Preferably, the buffer component 523 includes an inner layer and an outer layer, the inner layer being a rubber layer and the outer layer being a corrosion-resistant layer. This design not only improves the sealing reliability and movement smoothness of the buffer component 523 itself, but also significantly enhances its long-term service capability in harsh marine environments.

[0066] It should be noted that in this embodiment, the regulating pipe 524 is also equipped with at least one functional interface for centralized monitoring and maintenance management of multiple buffer components 523. Specifically, a main control valve, pressure gauge, and medium replenishment port can be installed at appropriate locations on the regulating pipe 524 to form an integrated operation and maintenance control system. The main control valve controls the flow of lubricating medium between the buffer components 523: it remains open under normal operating conditions to ensure system linkage response; it can be closed when a buffer component 523 is being repaired or replaced to achieve local isolation without affecting the normal operation of other units. The pressure gauge monitors the overall pressure level within the regulating pipe 524 in real time, reflecting the stress state of each buffer component 523 and the system operating pressure. Pressure change trend analysis can determine whether there are abnormal operating conditions such as overload, leakage, or blockage, providing data support for structural health monitoring. The medium replenishment port is used to centrally replenish lubricating medium (such as hydraulic oil or buffer solution) to the entire linkage system, avoiding the cumbersome operation of individually lubricating each buffer component 523 in traditional methods, significantly improving maintenance efficiency and operational convenience. In addition, the integrated piping system also has a fault diagnosis function: when a certain buffer component 523 leaks or is damaged, the overall system pressure will drop abnormally. Combined with the changes in pressure gauge readings and the control of zone valves, the fault area can be quickly located, enabling accurate troubleshooting and targeted repair.

[0067] In this embodiment, the second connecting structure 530 is rod-shaped and has good bending and axial load-bearing performance. Multiple second connecting structures 530 are arranged at equal intervals along the length of the first arc sub-grid 200 and fixedly (e.g., welded) to the side of the first arc sub-grid 200 facing the second arc sub-grid 300, corresponding one-to-one with multiple first buffer structures 520. This correspondence ensures the "one-to-one" precision of force transmission; that is, the local force on the first arc sub-grid 200 borne by each second connecting structure 530 can be directly transmitted to the first connecting structure 510 through the corresponding first buffer structure 520, avoiding the chaotic force flow caused by multiple second connecting structures 530 sharing a set of first buffer structures 520.

[0068] Furthermore, each second connecting structure 530 extends vertically and is arranged along the height direction of the first circular arc sub-grid 200, which is consistent with the overall force direction of the cofferdam, thus facilitating the uniform transfer of loads and improving structural stability.

[0069] Furthermore, each second connecting structure 530 is provided with a first hinge seat 531 on the side opposite to the first arc sub-grid 200, and the second connecting structure 530 is hinged to one end of the first buffer structure 520 through the first hinge seat 531. This design allows rotation between the second connecting structure 530 and the first buffer structure 520, thereby enabling adaptive adjustment of the force transmission path when subjected to wave eccentric impact or local deformation of the sub-grid, avoiding additional bending moments or connection damage caused by forced force transmission, and significantly improving the spatial coordination and force uniformity of the system.

[0070] In this embodiment, the transmission device further includes at least two second buffer structures 700 located at both ends of the first connecting structure 510, serving as transitional connection units between the transmission component 500 and the cylindrical main grid 100. Preferably, four second buffer structures 700 are provided, symmetrically arranged in pairs at the left and right ends of the first connecting structure 510, forming a double-sided, double-point support structure, further enhancing the force symmetry and structural stability of the transmission device under lateral loads.

[0071] Furthermore, the second buffer structure 700, on the side opposite to the first buffer structure 520, is fixedly connected to the side walls of the two cylindrical main cells 100, thereby reliably anchoring the entire transmission device to the main load-bearing frame of the cofferdam. This connection method ensures that external loads can be efficiently transmitted through the transmission component 500 to the rigid and high-bearing capacity cylindrical main cells 100, realizing continuous introduction and distributed load bearing of force flow, and avoiding stress concentration in local weak areas.

[0072] Furthermore, the second buffer structure 700 includes a fixed base 710, a guide rod 720, and an elastic element 730. The fixed base 710 is fixedly connected to the side wall of the cylindrical main grid 100 by welding, high-strength bolts, or mechanical fastening, forming a stable support foundation. The fixed base 710 has a horizontally extending movable groove 711 inside, used to accommodate the guide component and limit its movement trajectory. The guide rod 720 is fixedly disposed within the movable groove 711, used to guide the movement of the first connecting structure 510. The elastic element 730 is telescopically sleeved on the guide rod 720, and can specifically be a compression spring, rubber elastomer, disc spring, or hydraulic damping element, capable of elastic deformation under axial force, absorbing vibration energy and providing a restoring force. This design allows the first connecting structure 510 to generate controllable displacement along the axial direction of the guide rod 720 under external load or lateral pressure from the internal filler 400, achieving buffer absorption of initial impact energy. Meanwhile, the restoring force of the elastic element 730 allows the system to automatically reset after unloading, maintaining a pre-tightened state and ensuring the reliability and stability of long-term operation. In addition, the second buffer structure 700 not only realizes the flexible connection between the transmission device and the cylindrical main grid 100, but also constitutes the first-level buffer unit in the multi-level buffer system. It works in conjunction with the second-level buffer realized by the first buffer structure 520 to form a composite vibration reduction mechanism of "displacement adaptation - energy dissipation - dynamic balance".

[0073] To improve the water-stopping capacity of the cofferdam structure, in this embodiment, a water-stopping body is provided at the junction of the cylindrical main grid 100 and the first arc sub-grid 200. The water-stopping body extends into the seabed mud surface, and an elastic seal is provided between the water-stopping body and the transmission device. High-pressure jet grouting piles are installed below the seabed mud surface on the land side of the first arc sub-grid 200. A water-retaining wall is installed in the middle section between the first arc sub-grid 200 and the second arc sub-grid 300. Two sets of high-pressure jet grouting piles are installed below the seabed mud surface on the sea side and the land side of the water-retaining wall. The depth to which the water-retaining wall is driven into the seabed mud surface is greater than the depth to which the high-pressure jet grouting piles on both sides are driven into the seabed mud surface.

[0074] The installation steps of the reinforcing structure of the cofferdam sub-cell provided by the present invention include:

[0075] Step 1: Basic Prefabrication and Survey. Prefabricate the main cylindrical cell 100, the arc-shaped sub-cell, and the transmission device; perform corrosion protection and pre-assembly; and conduct a survey and clean the installation area based on the seabed topography.

[0076] Step Two: Installation of the cylindrical main grid 100 and the arc sub-grid. An offshore crane lifts the cylindrical main grid 100, a hydraulic pile hammer presses it into the seabed, and the first and second arc sub-grids 300 are then lifted and installed. A welding robot is used to weld the cylindrical main grid 100 to the arc sub-grids.

[0077] Step 3: Installation of the conduction component 500. Hoist the upper and lower first connecting structures 510, connect the second buffer structures 700 to both ends of the first connecting structures 510, weld the second buffer structures 700 to the cylindrical main grid 100, weld the second connecting structure 530 to the first arc sub-grid 200, and hinge the first buffer structure 520 between the first connecting structure 510 and the second connecting structure 530.

[0078] Step 4: Construction of the isolation component 600 and the filler 400. Hoist the isolation plate 610 and weld it to the top of the first arc sub-cell 200; hammer the adjusting block 620 on the isolation plate 610 so that it is embedded in the gap between two adjacent moving rods 540; the dredging vessel fills the space between the isolation plate 610 and the second arc sub-cell 300 with dredged sand, controlling the rate and elevation; after filling, allow it to stand still and vibrate to compact it.

[0079] Step 5: Debugging and Acceptance.

Claims

1. A reinforcing mechanism for a cofferdam sub-cell, installed on a cofferdam, the cofferdam comprising at least two spaced-apart cylindrical main cells, a first arc sub-cell and a second arc sub-cell connecting the two cylindrical main cells, and a filling body filling the space between the first arc sub-cell and the second arc sub-cell, characterized in that, The reinforcing mechanism includes a conductive device, the two ends of which are respectively connected to the side walls of the two cylindrical main cells. The conductive device is disposed between the filler and the first or second arc-shaped sub-cell, and has a first and second force-bearing sides facing opposite directions. The first force-bearing side is connected to the filler, and the second force-bearing side is connected to the first or second arc-shaped sub-cell. When the first or second arc-shaped sub-cell is subjected to an external load, the external load can be transmitted to the cylindrical main cell through the conductive device. At the same time, the filler applies a pressure opposite to the external load to the first force-bearing side.

2. The reinforcing mechanism of a cofferdam sub-cell according to claim 1, characterized in that, The conductive device includes an isolation component and a conductive component. The isolation component is disposed between the conductive component and the filler and abuts against the filler. The conductive component is disposed on the side of the isolation component away from the filler and is connected to the first arc sub-cell. The isolation component can restrict the filler from contacting the conductive component. The first force-bearing side is located on the isolation component, and the second force-bearing side is located on the conductive component.

3. The reinforcing mechanism of a cofferdam sub-cell according to claim 2, characterized in that, The conductive component includes a first connecting structure, a first buffer structure, and a second connecting structure. The first connecting structure is arranged horizontally, and its side away from the first buffer structure is movably connected to the isolation component. The side of the second connecting structure away from the first buffer structure is connected to the first arc sub-grid. The first buffer structure is retractably disposed between the first connecting structure and the second connecting structure.

4. The reinforcing mechanism of a cofferdam sub-cell according to claim 3, characterized in that, The first buffer structure includes a first retractable rod, a second retractable rod, and a buffer member. One end of the first retractable rod is hinged to the first connecting structure, and the other end is retractably connected to the buffer member. One end of the second retractable rod is hinged to the second connecting structure, and the other end is retractably connected to the buffer member. The buffer member has an elastic deformation.

5. The reinforcing mechanism of a cofferdam sub-cell according to claim 4, characterized in that, The first buffer structure is provided in multiple ways and arranged along the length of the first connecting structure. Each buffer element of the multiple first buffer structures is provided with a cavity containing a built-in lubricating medium, and the multiple cavities are connected by an adjustment pipe, so that the lubricating medium can flow between the multiple cavities through the adjustment pipe.

6. The reinforcing mechanism of a cofferdam sub-cell according to claim 5, characterized in that, The first connecting structure has at least two sets, which are arranged at intervals along the height direction of the isolation component, and multiple movable rods are movably arranged at intervals between the two sets of the first connecting structures. The movable rods correspond one-to-one with the first buffer structure and are hinged to the first buffer structure.

7. The reinforcing mechanism of a cofferdam sub-cell according to claim 6, characterized in that, The isolation assembly includes an isolation plate and a plurality of adjustment blocks. The isolation plate is disposed between the first connecting structure and the filler. The plurality of adjustment blocks are disposed on the side of the isolation plate facing the first connecting structure. Each adjustment block is inserted between two adjacent moving rods, and the cross-sectional area of ​​each adjustment block gradually increases along the direction closer to the filler.

8. The reinforcing mechanism of a cofferdam sub-cell according to claim 3, characterized in that, The conductive device includes at least two second buffer structures located at both ends of the first connecting structure. The first connecting structure is movably connected to the isolation component through the second buffer structures and can move toward or away from the filler. The two second buffer structures are respectively connected to the sidewalls of the two cylindrical main cells on the side away from the first buffer structure.

9. The reinforcing mechanism of a cofferdam sub-cell according to claim 8, characterized in that, The second buffer structure includes a fixed seat, a guide rod, and an elastic element. The fixed seat is fixedly connected to the cylindrical main grid and has a movable groove. The guide rod is disposed in the movable groove. The elastic element is telescopically disposed on the guide rod. The two ends of the first connecting structure are movably sleeved on the guide rod and abut against the elastic element.

10. The reinforcing mechanism of a cofferdam sub-cell according to claim 3, characterized in that, The second connecting structure is provided in multiple ways, fixedly disposed on the side of the first arc sub-grid facing the second arc sub-grid, and arranged at intervals along the length direction of the first arc sub-grid. Each second connecting structure is arranged vertically and extends along the height direction of the first arc sub-grid.

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