Detachable swash bulkhead structure for underwater test platform and mounting method

Abstract

The invention discloses a detachable swash cabin wall structure for an underwater test platform and an installation method, and relates to the technical field of swash cabins. The structure comprises a spherical pressure-resistant cabin, a cross-shaped supporting profile, a cross-shaped plate, a cabin wall plate group and a lap joint assembly, wherein the pressure-resistant cabin is radially provided with an access channel and an inner wall fixing lug plate; the supporting profile is arranged at the cabin bottom, the cross plate is arranged on the supporting profile in the radial direction, the cabin wall plate set is formed by splicing a plurality of narrow plates, one end of the cabin wall plate set is connected with the cross plate, the other end of the cabin wall plate set is connected with the lug plate, detachable connection is achieved through the lap joint plate and the bolt set, the width of the cabin wall plate is smaller than the diameter of the access channel, and a gap is reserved between the end and the cabin wall. All the components are prefabricated outside the cabin for corrosion prevention. During installation, the components are conveyed into the cabin, and the supporting profiles, the positioning installation cross plates and the cabin wall plate sets are sequentially welded. The device adapts to a spherical narrow space, is convenient to install, is small in welding amount, can effectively divide a liquid tank to inhibit a free liquid level, improves the stability of the platform, and adapts to frequent modification requirements of an underwater test platform.

Description

Technical Field

[0001] The invention relates to the field of sway control chamber technology, and in particular to a detachable sway control chamber structure and installation method for an underwater test platform. Background Technology

[0002] Anti-sway bulkheads are widely used in the fields of ships and submersibles to reduce the free surface and improve platform stability. They are generally welded inside the liquid tank and are equipped with reinforcing ribs and openings. Anti-sway bulkheads may not be required when the platform stability is sufficient.

[0003] In actual lake trials, the replacement and modification of onboard equipment may be required, which may lead to a decrease in the overall stability of the platform. Therefore, a feasible anti-sway bulkhead structure that is easy to install, has a short modification cycle, and low modification cost is proposed, which can effectively compensate for the loss of platform stability and ensure platform safety.

[0004] Therefore, we propose a detachable sway-damping bulkhead structure and installation method for underwater test platforms.

[0005] Application content Therefore, it is necessary to address the technical problems of decreased stability during equipment replacement and modification of underwater test platforms, as well as the inconvenience of installing traditional sway-controlling bulkheads, long modification cycles, and easy damage to internal sensors. A detachable sway-controlling bulkhead structure and installation method for underwater test platforms should be provided. This would effectively compensate for the loss of platform stability and ensure platform safety during frequent equipment replacement, structural modification, and testing in different water conditions. Simultaneously, it would facilitate the convenient installation and disassembly of the sway-controlling bulkhead, reducing damage to existing precision equipment within the bulkhead.

[0006] This application provides a detachable anti-sway bulkhead structure for an underwater test platform, comprising a pressure chamber, which is spherical in shape and has an access channel in the radial direction of the pressure chamber. Ear plates are fixedly connected to the inner wall of the pressure chamber. Two supporting profiles are fixedly arranged in a cross shape on the inner wall of the pressure chamber, and the perpendicular bisector of the supporting profile is aligned with the central axis of the access channel. Cross plates are arranged in a cross shape and correspondingly positioned on the supporting profiles in the radial direction of the pressure chamber. Multiple bulkhead panel assemblies are formed by splicing multiple bulkhead panels side-by-side in the width direction. One end of each bulkhead panel assembly is connected to the outer wall of the extended side of the cross plate in the cross direction, and the other end of each bulkhead panel assembly is connected to the ear plates. This structure, through its modular and detachable design, breaks through the limitations of traditional integrally welded anti-sway chambers, which cannot be flexibly adjusted. It can be quickly assembled and disassembled according to the stability requirements, load changes, and test scenario differences of the underwater test platform. While ensuring the anti-sway effect, it greatly improves the flexibility of underwater platform modification and upgrading. Moreover, the overall structure is adapted to the special curved space of the spherical pressure chamber, fully conforming to the structural characteristics of the underwater test platform, avoiding problems such as reduced anti-sway efficiency or installation difficulties caused by poor structural adaptability.

[0007] In other embodiments, the width dimension of the bulkhead panel is smaller than the diameter of the access passage. This size design is suitable for the confined construction space and transportation conditions of the spherical pressure chamber, allowing individual bulkhead panels to be easily transported through the access passage without disassembling the chamber or damaging the original structure. Furthermore, the small size of each bulkhead panel is lightweight, allowing for manual handling and installation without the need for lifting equipment. This is suitable for construction conditions within the spherical chamber where no large operating equipment is available, reducing construction difficulty and labor costs, and preventing damage caused by collisions between large panels and equipment or the bulkhead during transport.

[0008] In other embodiments, the bulkhead assembly includes a longitudinal bulkhead assembly and two transverse bulkhead assemblies. The longitudinal bulkhead assembly is formed by multiple longitudinal bulkheads side-by-side in the width direction, and the transverse bulkhead assembly is formed by multiple transverse bulkheads side-by-side in the width direction. The longitudinal and transverse bulkhead assemblies, together with intersecting plates, form a cross-shaped segmentation structure, which can evenly divide the spherical liquid tank into four independent liquid tank areas, resulting in a balanced and stable sloshing effect. Compared with bulkheads in a single direction, the cross-shaped segmentation can more comprehensively suppress liquid sloshing in different directions. The layout of two transverse bulkhead assemblies combined with one longitudinal bulkhead assembly can further optimize the internal space segmentation ratio, adapt to the center of gravity distribution requirements of the underwater test platform, and the side-by-side splicing method ensures the overall coverage area of ​​the bulkhead assembly while enabling convenient transportation and installation through the split design. At the same time, the number of splicing pieces can be adjusted according to the actual sloshing requirements, flexibly controlling the size of the segmented area.

[0009] In other embodiments, a lap joint assembly is also included. This assembly comprises several lap plates and bolt groups. The lap plates cover the joint between two adjacent bulkhead panels and are connected through the bolt groups. This provides a detachable mechanical connection between adjacent bulkhead panels. The joint between adjacent bulkhead panels is a weak point in structural rigidity, prone to cracking and misalignment due to liquid impact. Covering the joint with lap plates reinforces and strengthens it, improving the impact resistance and structural integrity of the joint. The detachable mechanical connection using bolt groups replaces traditional welding, facilitating rapid assembly by construction personnel in confined spaces and easy disassembly during subsequent modifications and maintenance without structural damage. Furthermore, the mechanical connection avoids the high temperatures and slag associated with welding, fundamentally preventing thermal and physical damage to precision sensors and electronic components within the bulkhead, thus ensuring the integrity of the equipment.

[0010] In other embodiments, the overlapping plates are plate-like structures of varying lengths, arranged on both sides of the bulkhead joint; the overlapping plates are arranged laterally or diagonally. The varying lengths of the overlapping plates can accommodate bulkhead joints of different widths and positions, achieving targeted reinforcement and avoiding connection redundancy or insufficient rigidity caused by overlapping plates of uniform size. The double-sided arrangement design can simultaneously constrain the bulkhead from both sides of the joint, effectively preventing warping and deformation of the bulkhead due to the impact of liquid in both directions, significantly improving the connection strength and overall rigidity at the joint, ensuring that the sloshing bulkhead maintains structural stability under long-term liquid sloshing conditions. Simultaneously, the double-sided overlap can evenly transfer loads, further reducing stress concentration at the joint. By arranging overlapping plates horizontally or diagonally, the overall stiffness distribution of the sway control bulkhead can be artificially adjusted, thereby changing the swaying frequency of the liquid in the tank and causing it to deviate from the platform's natural vibration frequency, thus avoiding the risk of resonance at its source. At the same time, overlapping plates in different directions can form irregular force transmission paths, dispersing the liquid impact energy and further improving the structure's anti-sway performance and structural stability.

[0011] In other embodiments, the bolt group adopts a double-layer nut anti-loosening structure, penetrating the lap plate and the bulkhead plate; the lap plate and the bulkhead plate are detachably connected. The underwater test platform is in a dynamic aquatic environment, where continuous liquid sloshing generates alternating loads, easily causing ordinary bolt connections to loosen and fall off. The double-layer nut anti-loosening structure utilizes the locking force between the nuts to significantly improve the anti-loosening performance of the bolt connection, ensuring the reliability of the connection structure under long-term underwater conditions. The bolt group's connection method, penetrating the lap plate and the bulkhead plate, achieves rigid fixation of all three, ensuring effective load transfer. Simultaneously, this connection method is convenient to assemble and disassemble, requiring no special tools for tightening and loosening, adapting to the needs of rapid construction within the cabin, and facilitating subsequent periodic inspection and maintenance. The detachable mechanical connection completely reduces welding operations at the splicing points inside the cabin. This not only avoids damage to the precision equipment and construction environment caused by high welding temperatures, slag, and fumes, but also significantly shortens the construction cycle and reduces reliance on professional welders. At the same time, the detachable design makes the oscillation control bulkhead reusable. When the underwater test platform changes the test area, adjusts the load, or upgrades the equipment, the bulkhead structure can be completely disassembled and reused, effectively reducing modification costs. Moreover, the disassembly process will not damage the pressure hull or the original equipment, maximizing the protection of the overall structural integrity of the platform.

[0012] In other embodiments, the ear plates are located on the extended side of the cross plate in the cross direction, and two ear plates are provided on each extended side of the cross plate, distributed vertically. The ear plates are pre-drilled and treated with anti-corrosion coating. During installation, they are first spot-welded to the pressure tank, and then fully welded after the bulkhead plate position is adjusted. The ear plates are arranged vertically on each extended side of the cross plate, which can form two-point fixation at the ends of the bulkhead plate assembly, ensuring the vertical stability of the bulkhead plate and preventing it from tilting or shaking under liquid impact. The pre-drilling and anti-corrosion treatment of the ear plates can reduce the process of drilling and coating in the tank, and avoid damage to the sensor by metal debris generated by drilling. The anti-corrosion treatment can improve the corrosion resistance of the ear plates in the underwater humid environment and extend their service life. The method of spot welding for positioning and then full welding for fixation can be accurately adjusted in the position of the bulkhead plate before final fixation, ensuring the accuracy of the installation position, while reducing the position deviation problem caused by one-time full welding, and improving the installation quality.

[0013] In other embodiments, the bottom of the bulkhead panel assembly is fixed to the supporting profile by welding; a gap is reserved between the ends of the bulkhead panel assembly and the inner wall of the pressure tank. Bottom welding ensures a rigid connection between the bulkhead panel assembly and the supporting profile, forming a stable bottom support foundation and preventing the bulkhead panels from shifting or falling off under horizontal liquid impact. Welding also further improves the overall structure's torsional resistance, adapting to the complex stress environment inside the spherical pressure tank. The inner wall of the spherical pressure tank is a curved structure, while the bulkhead panels are flat plates; a complete fit between the two is difficult. A 10mm gap accommodates the structural differences between the curved and flat surfaces, avoiding deformation of the bulkhead panels or damage to the tank wall due to forced fitting. High-precision leveling is not required during installation, providing high installation redundancy.

[0014] In other embodiments, the main structures of the bulkhead panels, overlapping plates, supporting profiles, and ear plates are all cut and coated with anti-corrosion coatings outside the pressure chamber. External prefabrication allows for standardized operations within the spacious external area, resulting in higher processing precision and faster efficiency. It also avoids pollution of the internal environment by dust and paint volatiles generated during internal cutting and coating, preventing harm to the health of construction personnel and preventing paint and metal debris from adhering to precision sensors and causing equipment malfunctions. Inside the chamber, only touch-up painting of welding locations is required to reduce damage to the sensors already installed by welding slag and metal filings.

[0015] This application, in a second aspect, provides a method for installing a detachable anti-sway bulkhead structure for an underwater test platform, comprising the following steps: S1. The detachable sway control bulkhead components are transported to the inside of the pressure chamber via the access passage. S2. Measure the set distance upward from the center point of the bottom of the pressure chamber and weld the support profile into the pressure chamber; S3. Connect the cross plates to the supporting profiles, and use the lap plates and bolt sets to initially install the longitudinal bulkhead plates and transverse bulkhead plates. For each piece, pre-tighten the two sets of bolts at the ends in the vertical direction. After the initial installation is completed, visually inspect the installation position and observe the gap between the bulkhead plate edge and the spherical shell to ensure that the longitudinal and transverse directions are properly arranged. S4. Spot weld the bottom of the bulkhead plate to the supporting profile and spot weld the ear plate to the spherical shell. The ear plates are arranged at the upper and lower positions of the oscillation bulkhead plate. The end plates are fitted with holes and connected with bolt groups. S5. Fully weld the ear plate, then install the remaining lap plate and bolt assembly. S6. Touch up the paint on the welded areas and clean up the welding slag.

[0016] The installation method described in this application is highly feasible, flexible and convenient to install, and easy to disassemble and assemble. It can be reinforced and the hole arrangement can be reduced according to the water conditions and test requirements. It is highly economical, with simple components, low processing difficulty and fast speed. The installation difficulty is low, with a vertical gap of more than 400mm at the top and bottom, which facilitates personnel access and movement. The weight of a single bulkhead panel is controlled within 20kg, and no lifting equipment is required. Two workers can complete the installation in 1-2 days. Attached Figure Description

[0017] Figure 1 This is a partial cross-sectional view of the present invention.

[0018] Figure 2 This is a longitudinal sectional view of the present invention.

[0019] Figure 3 This is a longitudinal sectional view from another perspective of the present invention.

[0020] The components include: 1. Pressure chamber; 2. Access passage; 3. Cross plate; 4. Longitudinal bulkhead; 5. Transverse bulkhead; 6. Ear plate; 7. Overlap plate; 8. Bolt assembly; 9. Support profile. Detailed Implementation

[0021] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0022] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0027] Example 1 like Figures 1-3As shown in the figure, this embodiment discloses a detachable sway-controlling bulkhead structure for an underwater test platform, including a pressure chamber 1, a supporting profile 9, a cross plate 3, and a bulkhead assembly. It can effectively suppress the free liquid surface inside the liquid tank of the underwater test platform, while taking into account the convenience of structural disassembly and assembly, construction safety, and protection of the original precision equipment inside the chamber. It solves the technical problems of the difficulty, long cycle, and easy damage to sensors and other equipment inside the chamber caused by the modification of traditional welded sway-controlling bulkheads. It is suitable for the actual use needs of underwater test platforms that frequently carry out equipment replacement, structural modification, and test conditions in different water areas.

[0028] This structure, through its modular disassembly and detachable connection design, breaks through the limitations of traditional integrally welded anti-sway chambers that cannot be flexibly adjusted. It can be quickly assembled and disassembled according to the stability requirements, load changes, and test scenario differences of the underwater test platform. While ensuring the anti-sway effect, it greatly improves the flexibility of underwater platform modification and upgrading. Moreover, the overall structure is adapted to the special curved space of the spherical pressure chamber 1, fully conforming to the structural characteristics of the underwater test platform, avoiding problems such as reduced anti-sway efficiency or installation difficulties caused by poor structural adaptability.

[0029] Specifically, such as Figure 1 As shown, the pressure chamber 1 in this embodiment has a spherical structure, and an access channel 2 is provided in the radial direction of the pressure chamber 1. Ear plates 6 are fixedly connected to the inner wall of the pressure chamber 1. The spherical pressure chamber 1 is a commonly used pressure-bearing structure for underwater test platforms, which has the advantages of uniform stress, strong pressure-bearing capacity, and high space utilization. The radial access channel 2 can meet the construction needs of construction personnel and structural components to enter and exit the chamber without excessively damaging the overall structural strength of the pressure chamber 1, thus ensuring the underwater sealing performance and pressure-bearing safety of the underwater platform. The ear plates 6 are set in advance on the inner wall of the pressure chamber 1, which can serve as the end fixing support points of the bulkhead assembly, avoiding stress concentration caused by the direct rigid connection between the bulkhead and the spherical bulkhead. At the same time, the ear plates 6 can be processed and anti-corrosion treated in advance, reducing on-site operation procedures inside the chamber and reducing the impact of the construction process on the chamber itself and internal equipment.

[0030] In this embodiment, two support profiles 9 are fixedly installed on the inner wall of the pressure tank 1 in a cross shape. The perpendicular bisector of the support profile 9 is on the same straight line as the central axis of the access channel 2. The cross-shaped arrangement of the support profiles 9 can form a symmetrical and stable support foundation, which is compatible with the central symmetrical structure of the spherical pressure tank 1. This ensures that the overall anti-sloshing tank wall structure is subjected to uniform stress, avoiding excessive stress on one side that could cause structural deformation or loosening of connections. The perpendicular bisector of the support profile 9 is collinear with the central axis of the access channel 2, which ensures that the subsequent cross plates 3 and tank wall panels are symmetrically arranged with the center of the tank as the reference. This facilitates positioning and calibration by construction personnel inside the tank, and also allows the liquid tank to be evenly divided, maximizing the effect of suppressing liquid sloshing. At the same time, this symmetrical layout can reduce construction positioning errors, adapt to the working environment of the spherical tank with its small space and inconvenient personnel construction, and reduce construction difficulty and safety risks.

[0031] In this embodiment, the cross plate 3 is arranged in a cross shape and is radially positioned on the supporting profile 9 along the pressure chamber 1. The cross-shaped cross structure can form a stable frame hub with the supporting profile 9. The radial arrangement along the pressure chamber 1 can fully conform to the radial curvature of the spherical chamber, ensuring the adaptability of the structure to the inner wall of the chamber. As the core load-bearing connector of the entire sway control bulkhead, the cross plate 3 can effectively transfer and disperse the load of the longitudinal and transverse bulkhead panels, avoiding excessive local stress that could damage the bulkhead panels or connecting structures. At the same time, the cross-shaped layout can quickly divide the main segmented area inside the chamber, providing a precise positioning benchmark for the subsequent splicing and installation of the bulkhead panels. Preliminary positioning can be completed without complex measuring tools, improving installation efficiency.

[0032] In this embodiment, there are multiple bulkhead panels, which are spliced ​​side by side in the width direction. One end of each bulkhead panel is connected to the extended outer wall of the cross plate 3 in the cross direction, and the other end of the bulkhead panel is connected to the ear plate 6. The design of multiple bulkhead panels being spliced ​​side by side can realize modular disassembly, solving the problem that integral bulkhead panels cannot be transported through the access channel 2. At the same time, the number and size of the splices can be flexibly adjusted according to the internal space size to adapt to different specifications of spherical pressure tanks 1. One end of the bulkhead panel is connected to the cross plate 3 and the other end is connected to the ear plate 6, forming a stable support structure with fixed ends. This not only ensures the overall structural rigidity and anti-sway capability of the sway-damping bulkhead, but also disperses the dynamic load generated by liquid impact through multi-point fixation, thereby improving the service life and stability of the structure under complex underwater working conditions.

[0033] Meanwhile, in this application, considering that the bulkhead panels need to pass through the access passage 2, the bulkhead panels are all long strips, which will have long sides and wide sides. In this application, the direction on both sides of the long side is the length direction, and the direction on both sides of the wide side is the width direction.

[0034] The bulkhead assembly is used to divide the pressure tank 1 into several independent areas to reduce the free surface. The free surface is a core factor leading to decreased stability and attitude imbalance of the underwater test platform. Especially in dynamic waters such as lake trials and sea trials, large-scale sloshing of the liquid in the tank will generate a large additional torque, which seriously affects the operational safety of the platform. By dividing the entire tank into multiple independent small areas by the bulkhead assembly, the range and amplitude of liquid sloshing in a single area can be significantly reduced, thereby reducing the impact of the free surface effect on the platform's stability. This effectively compensates for the platform's stability loss caused by equipment replacement and load changes. At the same time, the independent areas after division can be used to adjust the liquid distribution in a targeted manner, further optimizing the overall center of gravity and buoyancy of the underwater platform and ensuring the stable operation of the platform during the test.

[0035] The cross plate 3 is located at the intersection of the longitudinal bulkhead plate 4 and the transverse bulkhead plate 5. It is used to connect and fix adjacent bulkhead plates, forming an overall stress center. The intersection of the longitudinal and transverse bulkhead plates is the part where the stress on the sloshing bulkhead is most concentrated and most prone to deformation and loosening. The cross plate 3 can play a role in rigid reinforcement and load transfer in this area, connecting the longitudinal bulkhead plate 4 and the transverse bulkhead plate 5 into an integral frame, preventing a single bulkhead plate from falling off or breaking under stress. At the same time, as a stress center, the cross plate 3 can evenly transfer the transverse and longitudinal loads generated by liquid impact to the supporting profile 9 and the pressure tank 1 wall, preventing local stress concentration from damaging the structural integrity. It can also provide a precise docking benchmark for the splicing of bulkhead plates, ensuring uniform splicing gaps and improving the overall sealing and sloshing effect of the structure.

[0036] The supporting profile 9, bulkhead panels, cross plates 3, lap joint components, and ear plates 6 work together to form a detachable modular oscillation control bulkhead. By reducing on-site welding, damage to equipment inside the bulkhead is minimized. The modular and detachable design abandons the traditional all-welded construction method for oscillation control bulkheads. Each component can be independently processed, transported, and assembled, significantly reducing the amount of on-site welding work inside the bulkhead. The high temperature, slag, and iron filings generated by welding operations can easily damage core devices such as precision sensors and electronic control equipment inside the bulkhead, and welding fumes will worsen the construction environment inside the bulkhead. This modular structure only requires a small number of fixed-point weldings, with most of the connections being mechanical. This can effectively avoid welding damage to equipment, shorten the construction cycle, and reduce modification costs. At the same time, structural components can be quickly disassembled, replaced, or adjusted according to test requirements, improving the reusability and modification flexibility of the underwater test platform.

[0037] In this embodiment, the width of the bulkhead panel is smaller than the diameter of the access channel 2. This size design is key to adapting to the narrow construction space and transportation conditions of the spherical pressure chamber 1. Since the diameter of the access channel 2 of the underwater test platform is limited, large integral bulkhead panels cannot be transported smoothly into the chamber. By controlling the width of the bulkhead panel to within the diameter of the access channel 2, single bulkhead panels can be easily transported through the access channel 2 without disassembling the chamber or damaging the original structure. At the same time, the small-sized single bulkhead panel is lighter and can be manually transported and installed without the need for lifting equipment. This adapts to the construction conditions in the spherical chamber where there is no large operating equipment, reduces construction difficulty and labor costs, and also avoids damage to the equipment or bulkhead caused by large-sized panels during transportation.

[0038] In this embodiment, the bulkhead assembly includes a longitudinal bulkhead assembly and two transverse bulkhead assemblies. The longitudinal bulkhead assembly is formed by multiple longitudinal bulkheads 4 arranged side by side in the width direction, and the transverse bulkhead assembly is formed by multiple transverse bulkheads 5 arranged side by side in the width direction. The longitudinal and transverse bulkhead assemblies, together with the cross plate 3, form a cross-shaped segmentation structure, which can evenly divide the spherical liquid tank into four independent liquid tank areas, resulting in a balanced and stable anti-sloshing effect. Compared with bulkheads in a single direction, the cross segmentation can more comprehensively suppress liquid sloshing in different directions. The layout of two transverse bulkhead assemblies combined with one longitudinal bulkhead assembly can further optimize the internal space segmentation ratio, adapting to the center of gravity distribution requirements of the underwater test platform. The side-by-side splicing method not only ensures the overall coverage area of ​​the bulkhead assembly, but also enables convenient transportation and installation through the split design. At the same time, the number of splicing pieces can be adjusted according to the actual anti-sloshing requirements, flexibly controlling the size of the segmented area.

[0039] This embodiment also includes an overlapping connection assembly, which comprises several overlapping plates 7 and bolt groups 8. The overlapping plates 7 cover the joints of two adjacent bulkhead panels and are connected by bolt groups 8 through them, thereby realizing a detachable mechanical connection between adjacent bulkhead panels. The joints between adjacent bulkhead panels are weak points in structural rigidity and are prone to cracking and misalignment due to liquid impact. The overlapping plates 7 covering the joints can reinforce and strengthen them, improving the impact resistance and structural integrity of the joint. The mechanical detachable connection of bolt groups 8 through them replaces the traditional welding fixation, which is convenient for construction personnel to quickly assemble in the confined space and can be easily disassembled during subsequent modifications and maintenance without cutting or damaging the structure. At the same time, the mechanical connection does not generate high welding temperatures and welding slag, fundamentally avoiding thermal and physical damage to precision sensors and electronic components inside the cabin, and ensuring the integrity of the equipment inside the cabin.

[0040] In this embodiment, the overlapping plate 7 is a plate-like structure of varying lengths, arranged on both sides of the bulkhead joint. The overlapping plates 7 of varying lengths can adapt to bulkhead splicing gaps of different widths and positions, achieving targeted reinforcement and avoiding connection redundancy or insufficient rigidity caused by overlapping plates of uniform size. The double-sided arrangement design can constrain the bulkhead from both sides of the joint simultaneously, effectively preventing the bulkhead from warping or deforming due to the impact of liquid in both directions, greatly improving the connection strength and overall rigidity at the splicing position, ensuring that the sloshing bulkhead can still maintain structural stability under long-term liquid sloshing conditions. At the same time, the double-sided overlap can evenly transfer the load, further reducing stress concentration at the joint.

[0041] The overlapping plates 7 are arranged laterally or obliquely to change the sloshing frequency of the internal liquid tank and adjust the overall stiffness of the bulkhead, thus avoiding resonance. During operation, the underwater test platform will generate a natural vibration frequency. If the sloshing frequency of the liquid in the tank is close to the platform's natural frequency, resonance is very likely to occur, leading to loss of platform attitude control, structural fatigue damage, or even test failure. By arranging the overlapping plates 7 laterally or obliquely, the overall stiffness distribution of the anti-sloshing bulkhead can be artificially adjusted, thereby changing the sloshing frequency of the liquid in the tank and making it deviate from the platform's natural vibration frequency, thus avoiding the risk of resonance at the source. At the same time, overlapping plates 7 in different directions can form irregular force transmission paths, disperse the liquid impact energy, and further improve the structure's anti-sloshing performance and structural stability.

[0042] In this embodiment, bolt group 8 adopts a double-layer nut anti-loosening structure, penetrating the lap plate 7 and the bulkhead. The underwater test platform is in a dynamic water environment, and the continuous sloshing of the liquid will generate alternating loads, which can easily cause ordinary bolt connections to loosen and fall off. The double-layer nut anti-loosening structure can utilize the locking force between the nuts to greatly improve the anti-loosening performance of the bolt group 8 connection, ensuring the reliability of the connection structure under long-term underwater working conditions. The connection method of bolt group 8 penetrating the lap plate 7 and the bulkhead can achieve rigid fixation of the three, ensuring effective load transfer. At the same time, this connection method is convenient to install and disassemble, and can be tightened and disassembled without professional tools, which is suitable for the needs of rapid construction in the cabin and also facilitates subsequent regular inspection and maintenance.

[0043] The lap plate 7 and the bulkhead plate are connected in a detachable manner, which can achieve structural fixation without on-site welding. The detachable mechanical connection completely reduces the welding work at the splicing position inside the cabin. This not only avoids the damage to the precision equipment and construction environment inside the cabin caused by the high temperature of welding, welding slag and dust, but also significantly shortens the construction cycle and reduces the dependence on professional welding personnel. At the same time, the detachable design makes the oscillation bulkhead reusable. When the underwater test platform changes the test area, adjusts the load or upgrades the equipment, the bulkhead structure can be completely disassembled and reused, which effectively reduces the modification cost. Moreover, the disassembly process will not damage the pressure tank 1 and the original equipment, maximizing the protection of the overall structural integrity of the platform.

[0044] In this embodiment, the ear plate 6 is located on the extended side of the cross plate 3 in the cross direction, and two ear plates 6 are provided on each extended side of the cross plate 3, distributed vertically. The ear plates 6 are pre-drilled and treated with anti-corrosion. During installation, they are first spot-welded to the pressure tank 1, and then fully welded after the position of the bulkhead is adjusted. The ear plates 6 are arranged vertically on each extended side of the cross plate 3, which can form two-point fixation at the ends of the bulkhead assembly, ensuring the vertical stability of the bulkhead and preventing it from tilting or shaking under liquid impact. The pre-drilling and anti-corrosion treatment of the ear plates 6 can reduce the process of drilling and coating in the tank, and avoid damage to the sensor by metal debris generated by drilling. The anti-corrosion treatment can improve the corrosion resistance of the ear plates 6 in the underwater humid environment and extend its service life. The method of spot welding for positioning and then full welding for fixation can be accurately adjusted in the position of the bulkhead before final fixation, ensuring the accuracy of the installation position, while reducing the position deviation problem caused by one-time full welding, and improving the installation quality.

[0045] In this embodiment, the bottom of the bulkhead panel assembly is fixed to the support profile 9 by welding. The bottom welding and fixing can ensure the rigid connection between the bulkhead panel assembly and the support profile 9, forming a stable bottom support foundation, preventing the bulkhead panel from shifting or falling off under the horizontal impact of liquid. At the same time, the welding and fixing can further improve the torsional performance of the overall structure and adapt to the complex stress environment inside the spherical cabin.

[0046] A gap of about 10mm is reserved between the end of the bulkhead panel assembly and the inner wall of the pressure chamber 1. During installation, no high-precision level is required for positioning, which has a high degree of installation redundancy. The inner wall of the spherical pressure chamber 1 is a curved structure, while the bulkhead panel is a flat plate. It is difficult to achieve a complete fit between the two. The reserved 10mm gap can accommodate the structural differences between the curved and flat surfaces and avoid the bulkhead panel being squeezed and deformed or the bulkhead being damaged due to forced fitting.

[0047] In this embodiment, the main structures of the bulkhead panel assembly, overlapping plate 7, supporting profile 9, and ear plate 6 are all cut and coated with anti-corrosion coating outside the pressure chamber 1. Prefabrication outside the chamber can utilize the spacious external space to carry out standardized operations, resulting in higher processing accuracy and faster efficiency. At the same time, it avoids the pollution of the chamber environment by dust and paint volatiles generated during cutting and coating inside the chamber, which could harm the health of construction personnel. It also prevents paint and metal debris from adhering to precision sensors and causing equipment failure.

[0048] Only the welded areas inside the cabin need to be touched up with paint to reduce damage to the sensors already installed inside the cabin caused by welding slag and iron filings generated during the welding process.

[0049] In this embodiment, the length of the cross plate 3 is smaller than the diameter of the pressure chamber 1. This size design ensures that the cross plate 3 is fully adapted to the internal radial space of the spherical pressure chamber 1, avoiding the deformation of the chamber walls due to excessive length or forced installation. At the same time, the reasonable size ratio allows the cross plate 3 to be located in the central stress area inside the chamber, maximizing the role of the stress center and evenly bearing the load transmitted by each chamber wall plate. The size being smaller than the diameter of the chamber also facilitates the transport of the cross plate 3 to the chamber through the access channel 2 without disassembling the structure, ensuring the overall rigidity and structural integrity of the cross plate 3 and improving the ease of installation.

[0050] Example 2 This embodiment discloses an installation method for a detachable anti-sway bulkhead structure for an underwater test platform, including the following steps: The detachable sway control bulkhead components are transported to the pressure chamber 1 through personnel access passage 2; Measure 500mm upwards from the center point of the bottom of the pressure chamber 1, and weld the support profile 9 onto the pressure chamber 1; Subsequently, the cross plate 3 is placed on the support profile 9. Then, the longitudinal bulkhead plate 4 and the transverse bulkhead plate 5 are initially installed using the lap plate 7 and bolt group 8. Two sets of bolt groups 8 are pre-tightened at the ends in the vertical direction for each piece. After the initial installation is completed, the installation position is visually inspected to observe the gap between the bulkhead plate edge and the spherical shell to ensure proper arrangement in the longitudinal and transverse directions. Subsequently, the bottom of the bulkhead plate is spot-welded to the support profile 9, and then the ear plate 6 is spot-welded to the spherical shell 2, respectively arranged at the upper and lower positions of the oscillation bulkhead plate. The end plates are fitted with holes and connected with bolt group 8. Subsequently, the ear plate 6 was fully welded, and the remaining lap plate 7 and bolt group 8 were installed.

[0051] Finally, touch up the paint on the welded areas, clean up the welding slag and clean the site to ensure the cleanliness of the cabin space and avoid damage to the installed sensors by welding slag, iron filings and other debris.

[0052] This embodiment has the following beneficial effects: Suitable for installation in narrow spherical spaces, where it is difficult for workers to stand firmly, the support profile 9 provides vertical support for the bulkhead, making it easier for workers to carry out construction and reducing certain construction risks.

[0053] To meet the sway control requirements, the overall liquid tank is divided into four areas, effectively improving the stability of the overall underwater platform; by adjusting the layout of the lap plate 7 (horizontal and diagonal distribution), the swaying frequency of the internal liquid tank is changed and the rigidity of the bulkhead is adjusted to avoid resonance.

[0054] The modification has minimal impact on the original system, with fewer welding positions and a smaller welding area, reducing the possibility of damage to the sensors caused by the welding process and welding slag and iron filings; all structural components are coated with anti-corrosion coating on the outside, and only the weld points inside the cabin need to be touched up with paint, so the working environment has little impact on the human body. The installation has a high degree of redundancy. After assembly, a gap of about 10mm is left between the end of the bulkhead panel and the two ends of the interior of the sphere. The positioning does not need to be particularly precise, which reduces the need for equipment such as level instruments. It is highly feasible, flexible and convenient to install, and easy to disassemble and assemble. Reinforcing ribs can be added and hole arrangement can be reduced according to water conditions and test requirements. It is highly economical, with simple components and low processing difficulty and speed. It is easy to install, with vertical gaps of more than 400mm at the top and bottom, which facilitates personnel access and movement. The weight of a single bulkhead panel is controlled within 20kg, and no lifting equipment is required. Two workers can complete the installation in 1-2 days.

[0055] The above description is an explanation of the invention, not a limitation thereof. The scope of the invention is defined in the claims. Within the scope of protection of the invention, any form of modification may be made.

Claims

1. A detachable anti-sway bulkhead structure for an underwater test platform, characterized in that, include: The pressure chamber has a spherical structure and an access channel is provided in the radial direction of the pressure chamber. Ear plates are fixedly connected to the inner wall of the pressure chamber. Two support profiles are fixedly installed on the inner wall of the pressure chamber in a cross shape, and the vertical line of the support profile is on the same straight line as the central axis of the access channel. Cross plates are arranged in a cross shape and are correspondingly installed on the supporting profiles along the radial direction of the pressure chamber; The bulkhead panel assembly is a plurality of such assemblies, which are formed by splicing multiple bulkhead panels side by side in the width direction; one end of each bulkhead panel assembly is connected to the outer wall of the extended side in the cross direction of the cross plate, and the other end of each bulkhead panel assembly is connected to the ear plate.

2. The detachable anti-sway bulkhead structure for an underwater test platform according to claim 1, characterized in that, The width dimension of the bulkhead is smaller than the diameter of the access passage.

3. The detachable anti-sway bulkhead structure for an underwater test platform according to claim 1, characterized in that, The bulkhead assembly includes a longitudinal bulkhead assembly and two transverse bulkhead assemblies. The longitudinal bulkhead assembly is formed by multiple longitudinal bulkheads arranged side by side in the width direction, and the transverse bulkhead assembly is formed by multiple transverse bulkheads arranged side by side in the width direction.

4. The detachable anti-sway bulkhead structure for an underwater test platform according to claim 1, characterized in that, It also includes an overlap connection assembly, which includes several overlap plates and bolt groups. The overlap plates cover the joint between two adjacent bulkhead panels and are connected through the bolt groups.

5. A detachable anti-sway bulkhead structure for an underwater test platform according to claim 4, characterized in that, The lap plate is a plate-shaped structure of varying lengths, arranged on both sides of the bulkhead joint. The overlapping plates are arranged horizontally or diagonally.

6. A detachable anti-sway bulkhead structure for an underwater test platform according to claim 4, characterized in that, The bolt group adopts a double-layer nut anti-loosening structure, which penetrates the lap plate and the bulkhead plate; The overlapping plate and the bulkhead plate are detachably connected.

7. A detachable anti-sway bulkhead structure for an underwater test platform according to claim 1, characterized in that, The ear plate is located on the extended side of the cross plate in the cross direction, and two ear plates are provided on each extended side of the cross plate, one above the other.

8. A detachable anti-sway bulkhead structure for an underwater test platform according to claim 1, characterized in that, The bottom of the bulkhead panel assembly is fixed to the supporting profile by welding. A gap is reserved between the end of the bulkhead panel assembly and the inner wall of the pressure chamber.

9. A detachable anti-sway bulkhead structure for an underwater test platform according to claim 1, characterized in that, The main structures of the bulkhead panels, overlapping plates, supporting profiles, and ear plates are all cut, processed, and coated with anti-corrosion coatings on the outside of the pressure tank.

10. A method for installing a detachable anti-sway bulkhead structure for an underwater test platform according to any one of claims 1 to 9, characterized in that, Includes the following steps: S1. The detachable sway control bulkhead components are transported to the inside of the pressure chamber via the access passage. S2. Measure the set distance upward from the center point of the bottom of the pressure chamber and weld the support profile into the pressure chamber; S3. Connect the cross plates to the supporting profiles, and use the lap plates and bolt sets to initially install the longitudinal bulkhead plates and transverse bulkhead plates. For each piece, pre-tighten the two sets of bolts at the ends in the vertical direction. After the initial installation is completed, visually inspect the installation position and observe the gap between the bulkhead plate edge and the spherical shell to ensure that the longitudinal and transverse directions are properly arranged. S4. Spot weld the bottom of the bulkhead plate to the supporting profile and spot weld the ear plate to the spherical shell. The ear plates are arranged at the upper and lower positions of the oscillation bulkhead plate. The end plates are fitted with holes and connected with bolt groups. S5. Fully weld the ear plate, then install the remaining lap plate and bolt assembly. S6. Touch up the paint on the welded areas and clean up the welding slag.

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