Ship bilge keel structure
By setting two sets of symmetrical bilge keel sections in the bilge section of the ship, and using inclined arrangement and pads to increase the stress area, the problem of the bilge keel and rudder bearing large water pressure loads is solved, thereby improving the anti-rolling ability and protecting the welds, and reducing maintenance costs.
Patent Information
- Application Number
- CN202511511712.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2025-12-16
AI Technical Summary
In existing technologies, the bilge keel and the bilge of a ship need to bear a large water pressure load, which makes the weld seam easy to be damaged, or the rigidity of the bilge keel is greater than that of the outer plate of the bilge, which can easily damage the outer plate structure of the ship. In addition, the design and construction are complicated.
Two sets of symmetrically arranged bilge keel sections are used, which are spaced apart and inclined on the curved outer shell of the ship. The stress-bearing area is increased by pads, and L-shaped cross sections and T-shaped connections are used to improve the connection strength. Reinforcing elbow plates are set at the ends of the bilge keel sections to reduce stress concentration.
It effectively reduces the constraint of the bilge keel on the hull, lowers the risk of weld damage, improves anti-roll capability, and at the same time reduces maintenance costs and operational difficulty, while enhancing the bonding strength between the bilge keel and the hull.
Smart Images
Figure CN121133908A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of shipbuilding technology, and in particular to a ship bilge keel structure. Background Technology
[0002] A bilge keel is a continuous structure installed on the outside of the bilge of a ship. It is generally installed on ships with a small block coefficient and is mainly used to enhance the ship's seakeeping and stability. Under the premise of reasonable design and arrangement, it can greatly reduce the ship's roll and pitch, and improve the ship's safety during navigation.
[0003] Currently, the most widely used bilge keel is the single-piece bilge keel, which is arranged in the bilge of the ship. Its structural forms include rolled steel, single-plate arrangement, and multiple plates arranged by welding. The technology is relatively mature. However, when resisting rolling, the single-plate bilge keel structure usually has to bear a large water pressure, which causes the weld seam between the bilge keel and the bilge shell to bear a large water pressure load, often leading to weld structure failure. Once such failure occurs, the ship needs to be returned to the shipyard for repair, resulting in significant time and construction costs. On the other hand, bilge keels composed of double plates and multiple plates welded together usually have greater rigidity than the outer bilge plate structure after assembly, which can also easily cause damage to the outer hull plate structure. In addition, for ship design and construction, the more structural parts there are, the greater the design workload and the longer the assembly and welding time. Summary of the Invention
[0004] In view of this, the present invention provides a ship bilge keel structure to solve the problems in the prior art where the bilge keel and the ship's bilge need to bear large water pressure loads, which makes the welds easy to be damaged, or the rigidity of the bilge keel is greater than that of the bilge outer plate, which makes it easy to damage the ship's outer plate structure.
[0005] A ship bilge keel structure includes a ship bilge and bilge keels disposed on the ship bilge. Two sets of bilge keels are symmetrically disposed on the curved outer shell plating of the ship. Each bilge keel includes at least two segmented bilge keel segments, with adjacent segments spaced apart. Each bilge keel segment spans at least two ribs located inside the outer shell plating. Each bilge keel segment is inclined to the horizontal plane. A pad is fixedly disposed on the curved outer shell plating, and each bilge keel segment is fixedly disposed on the pad. Each bilge keel segment has an L-shaped cross-section and includes a vertically arranged web and a face plate, with the web fixedly disposed on the pad.
[0006] Furthermore, the panels and webs of the bilge keel segments are connected together by welding.
[0007] Furthermore, the face plate and the web plate are connected in a T-shape, with the end of the face plate set on the surface of the web plate.
[0008] Furthermore, each end of the bilge keel segment is provided with a gradually narrowing toe tip.
[0009] Furthermore, the panel extends diagonally downwards.
[0010] Furthermore, the inner side of the curved outer shell plate of the vessel is also provided with a reinforcing elbow plate, which is correspondingly provided with the end of the bilge keel section.
[0011] Furthermore, the two adjacent bilge keel sections extend along the curved hull plates of the ship, and the different bilge keel sections are located at different heights.
[0012] The beneficial effects of the bilge keel structure in this invention are as follows: The bilge keel is arranged in two sets, symmetrically. By segmenting the bilge keels at intervals, the stress on each individual bilge keel segment is reduced. While providing anti-roll resistance, it also reduces resistance to hull deformation. Since the hull is long, slight deformation is inevitable during wave motion; segmenting the bilge keels reduces the constraint on the hull. Furthermore, by placing the segmented bilge keels on a base plate, it can further enhance… With a large load-bearing area, the force generated by the bilge keel during roll is transferred to the base plate, which increases the base area of the bilge keel and the hull, reducing stress concentration. The inclined bilge keel not only makes it easier to fit with the bilge of the ship, but also guides the water flow, reducing the load-bearing capacity of the weld between the outer plate and the bilge keel. This solves the problems in the prior art where the bilge keel and the bilge of the ship need to bear a large water pressure load, which makes the weld easily damaged, or the rigidity of the bilge keel is greater than that of the outer plate of the bilge, which easily damages the outer plate structure of the hull. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram illustrating the fit between the bilge keel and the curved outer shell plate of the ship in an embodiment of the bilge keel structure of the present invention.
[0015] Figure 2 This is a schematic diagram of the bilge keel structure in an embodiment of the ship bilge keel structure of the present invention;
[0016] Figure 3 This is a schematic diagram of the structure between the bilge keel and the curved outer shell of the ship in an embodiment of the bilge keel structure of the present invention;
[0017] Figure 4This is a schematic diagram of the structure between the bilge keel segment and the curved outer shell plate of the ship in an embodiment of the bilge keel structure of the present invention.
[0018] The labels in the diagram mean the following: 11. Curved shell plate; 12. Rib plate; 13. Longitudinal connection structure; 2. Bike keel segment; 21. Main body segment; 22. Toe end; 23. Panel; 24. Web plate; 3. Reinforcing elbow plate; 4. Pad plate. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.
[0020] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.
[0021] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."
[0022] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.
[0023] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.
[0024] In the following description, suffixes such as "module," "part," or "unit" used to denote elements are used only for the convenience of the description of the invention and have no specific meaning in themselves. Therefore, "module" and "part" can be used interchangeably.
[0025] To better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.
[0026] In Embodiment 1 of the ship bilge keel structure of this invention:
[0027] In this embodiment, the bilge keel segments are arranged in multiple spaced sections and are arranged at an angle. This reduces the stress of the bilge keel segments on the curved outer shell of the ship and also serves to guide the flow of air.
[0028] like Figure 1 and Figure 2 As shown, in this embodiment, the bilge keel structure includes a bilge keel and a curved outer shell plate 11 for mounting the bilge keel. The curved outer shell plate 11 is the part of the ship that is in direct contact with seawater. Two sets of bilge keels are provided, symmetrically arranged on the curved outer shell plate 11. The two sets of bilge keels have the same structure; the following description uses one set of bilge keels as an example.
[0029] like Figure 1 and Figure 4As shown, in this embodiment, the bilge keel segments 2 are arranged sequentially along the length of the ship. To facilitate the installation of the bilge keel segments 2 on the ship, a pad 4 is welded and fixed to the curved outer shell plate 11 of the ship, which fits against the curved outer shell plate 11. In this embodiment, the pad 4 is a flat steel. The flat steel increases the stress between the bilge keel segments 2 and the curved outer shell plate 11, preventing stress concentration on the curved outer shell plate 11 and thus avoiding damage to it. The total length of the multiple bilge keel segments 2 is similar to that of a traditional bilge keel, so the anti-roll capability is not weakened. Moreover, when waves come, due to the large size of the hull, slight deformation of the hull is inevitable. By intermittently arranging the bilge keel segments 2, the resistance to hull deformation can be reduced while maintaining the anti-roll capability, allowing the hull to dissipate some of the force through slight deformation, thereby protecting the hull. Furthermore, when one of the bilge keel segments 2 is damaged, it is not necessary to repair the entire bilge keel; only the corresponding bilge keel segment 2 needs to be repaired, thus reducing maintenance costs.
[0030] In this embodiment, each bilge keel segment 2 is arranged at a certain angle to the horizontal plane. During the ship's forward movement, it guides the water flow, directing it more smoothly and significantly reducing eddies and resistance, thus acting as a deflector. Furthermore, the bilge keels are arranged along the curved outer shell plates 11 of the hull. Since the curved outer shell plates 11 have a certain curvature in both the vertical and horizontal directions, the height of the bilge keels is not necessarily uniform. In this embodiment, the different heights of the bilge keels vary, causing the bilge keel segments 2 to extend along the curvature of the hull itself, especially noticeable in the bow and stern areas. Of course, in other embodiments, the bilge keels may be arranged at uniform height.
[0031] like Figure 1 and Figure 4As shown, the bilge keel segment 2 is fixedly mounted on the base plate 4. Specifically, the bilge keel segment 2 includes mutually perpendicular web plates 24 and face plates 23. The web plates 24 are welded onto the base plate 4, and the face plates 23 are welded onto the web plates 24. The width of the web plates 24 is greater than the width of the face plates 23. That is, the cross-section of the bilge keel segment 2 forms an L-shape. This shape provides the bilge keel segment 2 with a certain degree of flexibility during roll resistance, further reducing stress concentration between the curved outer shell plate 11 and the bilge keel. Meanwhile, in order to avoid stress concentration on the curved surface at the end of the bilge keel segment 2, the main body segment 21 is located at the center of the bilge keel segment 2, and the two ends of the main body segment 21 are provided with gradually narrowing toe ends 22. The toe ends 22 reduce the contact area between the end of the bilge keel segment 2 and the water, thereby reducing the resistance to water during movement, and thus reducing the stress between the end of the bilge keel segment 2 and the curved outer shell plate 11 during anti-rolling.
[0032] like Figure 1 and Figure 3 As shown, the bilge keel segment 2 extends along the length of the hull, and ribs 12 are provided on the inner side of the curved outer shell plate 11. The same bilge keel segment 2 spans at least two ribs 12 in the length direction. In this embodiment, the same bilge keel segment 2 spans 3-4 ribs 12. At the same time, a reinforcing elbow plate 3 is provided on the inner side corresponding to the toe end 22 of the bilge keel segment 2. The reinforcing elbow plate 3 extends laterally and is connected to the longitudinal bilge connection structure 13 on the inner side of the curved outer shell plate 11. The extension direction of the reinforcing elbow plate 3 is perpendicular to the extension direction of the bilge keel segment 2, thereby reinforcing the toe end 22 of the bilge keel segment 2 and the position where it contacts the curved outer shell plate 11.
[0033] Furthermore, during welding, the bilge keel needs to withstand significant forces, necessitating a robust weld. In this embodiment, the web 24 of the bilge keel segment 2 is relatively fixed to the center of the pad 4, allowing welding to be performed on both sides of the web 24, resulting in a more stable structure. To achieve a reliable connection between the face plate 23 and the web 24, a T-shaped connection is used, with the end of the face plate 23 positioned on the surface of the web 24. This design enables double-sided welding, thereby improving the connection strength between the face plate 23 and the web 24. It is worth noting that the T-shaped connection here refers only to the connection at the ends of the face plate and the web; that is, the end of the face plate is not directly aligned with the end of the web, but rather there is a certain gap. This ensures that the face plate can be welded to both sides relative to the web, increasing welding strength and reducing operational difficulty. Overall, the face plate and the web still form an L-shape. Simultaneously, after welding, the face plate 23 extends downwards at an angle relative to the web 24.
[0034] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
Claims
1. A bilge keel structure for a ship, comprising a bilge section and bilge keels disposed on the bilge section, wherein two sets of bilge keels are symmetrically disposed on the curved outer shell plates of the port and starboard sides of the ship, characterized in that: The bilge keel includes at least two segmented bilge keel segments, with adjacent bilge keel segments spaced apart. Each bilge keel segment spans at least two ribs located inside the ship's outer plating. Each bilge keel segment is inclined to the horizontal plane. A pad is fixedly mounted on the curved outer shell plate, and the bilge keel segments are fixedly mounted on the pad. Each bilge keel segment has an L-shaped cross-section and includes a vertically arranged web and a face plate, with the web fixedly mounted on the pad.
2. The ship bilge keel structure according to claim 1, characterized in that: The bilge keel segments are joined together by welding the front and back panels.
3. The ship bilge keel structure according to claim 2, characterized in that: The face plate and the web plate are connected in a T-shape, with the end of the face plate set on the surface of the web plate.
4. The ship bilge keel structure according to any one of claims 1-3, characterized in that: The bilge keel segments are provided with gradually narrowing toe tips at both ends.
5. The ship bilge keel structure according to any one of claims 1-3, characterized in that: The panel extends diagonally downwards.
6. The ship bilge keel structure according to any one of claims 1-3, characterized in that: The inner side of the curved outer shell plate of the vessel is also provided with a reinforcing elbow plate, which is correspondingly provided with the end of the bilge keel section.
7. The ship bilge keel structure according to any one of claims 1-3, characterized in that: The two adjacent bilge keel sections extend along the curved hull plates of the ship, and the different bilge keel sections are located at different heights.