A fairlead hole structure for double-hull bulwark

Abstract

The present invention discloses a fairlead hole structure for a double-hull bulwark, comprising a double-hull bulwark portion, a fairlead hole portion and a connecting bracket; the fairlead hole portion comprises an outer sealing plate, an intermediate cylindrical sealing plate, an inner sealing plate, an outer round steel and an inner round steel; the outer sealing plate and the inner sealing plate are both one-way curved plates with a conical bell mouth; the two ends of the outer sealing plate are respectively welded to the outer end ports of the bulwark outer plate and the intermediate cylindrical sealing plate; the two ends of the inner sealing plate are respectively welded to the inner end ports of the bulwark inner plate and the intermediate cylindrical sealing plate; the outer round steel and the inner round steel are both annular and respectively welded to the two end ports of the intermediate cylindrical sealing plate; a plurality of connecting brackets are radially arranged at equal angles around the center of the intermediate cylindrical sealing plate and are welded to the fairlead hole portion and the double-hull bulwark portion on all sides. The present invention can make the fairlead hole and the double-hull bulwark structure self-contained, can be manufactured and formed on site in one go, avoiding the problem of secondary construction, and at the same time has the advantages of high structural strength, rigidity and stability, simplicity, economy and beauty.

Description

Technical Field

[0001] The invention belongs to the technical field of shipbuilding, and in particular relates to a fairlead hole structure of a double-hull bulwark. Background Art

[0002] A ship's fairlead is a circular or oval casting installed on the deck or embedded in the bulwark. It's typically made of cast iron or cast steel. Its primary function is to limit the mooring line's lead-out position and reduce damage to the ship's bulwark or deck structure caused by friction. When a ship is moored, the mooring line is subjected to significant tension due to the interaction of wind, waves, and currents. The fairlead's restraining effect on the rope causes the fairlead to withstand significant tension and friction transmitted by the rope. Therefore, the fairlead's structural strength, as well as the surrounding hull and bulwark structures, must be able to withstand sufficient rope forces.

[0003] Currently, ship fairleads are typically prefabricated as standard equipment by ship equipment manufacturers, manufactured independently from the main hull. They are then installed and reinforced after the hull is constructed. There are two main installation methods: The deck fairlead is mounted on the main deck, where it relies on a base connected to the main deck and transmits all cable forces; the other is embedded in the bulwark and connected to the bulwark structure by reinforced brackets. The bulwark structure primarily bears the cable forces, but the force is more evenly distributed than the deck fairlead.

[0004] In the above-mentioned prior art, firstly, prefabricated fairleads are standard equipment items, and are mostly suitable for single-layer bulwark structures. However, for double-layer bulwark structures, due to their complex structure and varying dimensions such as bulwark thickness, standard fairlead models and sizes may not be suitable. Moreover, their installation is difficult and the construction process is complicated. Therefore, they are not suitable for double-layer bulwark structures. Secondly, the prefabricated fairleads are not constructed simultaneously with the ship's main body. The fairlead equipment must be installed and reinforced after the main hull or bulwark structure is completed. This prevents the pre-outfitting construction of the hull sections from being carried out simultaneously, resulting in the problem of secondary bulk construction. Thirdly, during the installation of the prefabricated fairleads, holes must be drilled in the completed bulwark structure, and this can only be done by manual on-site cutting, rather than CNC automatic cutting. This makes cutting difficult and results in poor precision, resulting in poor aesthetics after completion. Finally, prefabricated fairleads require the ordering, procurement, and storage of specialized equipment, and their procurement price is generally high, resulting in additional expenditures in terms of manpower, financial resources, and material resources, making them less economical. Summary of the Invention

[0005] The object of the present invention is to provide a fairlead hole structure for a double-hull bulwark, which enables the fairlead hole to be integrated with the double-hull bulwark structure and can be formed on site in one step, thus avoiding the problem of secondary construction. At the same time, it has high structural strength, rigidity and stability, and is simple, economical and beautiful.

[0006] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0007] A fairlead hole structure for a double-hull bulwark, comprising a double-hull bulwark portion, a fairlead hole portion, and a plurality of connecting brackets; the double-hull bulwark portion comprises a bulwark outer plate, a bulwark top plate, and a bulwark inner plate constituting a hollow wall structure; the fairlead hole portion passes through both the inner and outer sides of the double-hull bulwark portion; the fairlead hole portion comprises an outer sealing plate, an intermediate cylindrical sealing plate, an inner sealing plate, an outer round steel, and an inner round steel; the outer sealing plate and the inner sealing plate are both one-way curved plates with a conical bell mouth; the large-diameter end of the outer sealing plate is welded to the bulwark outer plate, and the small-diameter end of the outer sealing plate is welded to the intermediate cylindrical sealing plate. the outer end port is welded; the large-diameter end of the inner sealing plate is welded to the inner plate of the bulwark, and the small-diameter end of the outer sealing plate is welded to the inner end port of the intermediate cylindrical sealing plate; the outer round steel and the inner round steel are both annular; the outer round steel is welded at the outer end port of the intermediate cylindrical sealing plate; the inner round steel is welded at the inner end port of the intermediate cylindrical sealing plate; a plurality of connecting brackets are arranged radially at equal angles around the center of the intermediate cylindrical sealing plate, and the four sides of the connecting brackets are respectively welded to the outer sealing plate, the intermediate cylindrical sealing plate, the inner sealing plate and the double-hull bulwark portion.

[0008] As a preferred solution of the present invention, the cone angle of the conical bell mouth of the inner sealing plate is smaller than the cone angle of the conical bell mouth of the outer sealing plate.

[0009] As a preferred embodiment of the present invention, the diameter of the outer round steel is the same as the diameter of the outer end port of the intermediate cylindrical sealing plate.

[0010] As a preferred embodiment of the present invention, the diameter of the inner round steel is the same as the diameter of the inner end port of the intermediate cylindrical sealing plate.

[0011] As a preferred solution of the present invention, the hole shape of the fairlead hole portion is circular or elliptical.

[0012] As a preferred solution of the present invention, there are at least 8 connecting brackets.

[0013] As a preferred solution of the present invention, the double-hull bulwark portion further comprises a transverse partition capable of dividing the hollow wall structure formed by the bulwark outer plate, the bulwark top plate and the bulwark inner plate into a plurality of cavity structures.

[0014] As a preferred embodiment of the present invention, the double-hull bulwark portion further comprises a plug welding plate, which is located between the bulwark inner plate and the transverse bulkhead, and is welded to the transverse bulkhead by double-sided fillet welds, and is welded to the bulwark inner plate by plug welding.

[0015] As a preferred solution of the present invention, the thickness of the bulwark outer plate, bulwark top plate, bulwark inner plate and transverse partition close to the fairlead hole is greater than the thickness of the bulwark outer plate, bulwark top plate, bulwark inner plate and transverse partition away from the fairlead hole.

[0016] The double-hull bulwark fairlead structure provided by the present invention has the following beneficial effects compared with the prior art:

[0017] The fairlead hole of the present invention is composed of an outer sealing plate, an intermediate cylindrical sealing plate, an inner sealing plate, an outer round steel and an inner round steel; wherein, the outer sealing plate and the inner sealing plate respectively fill the reserved gaps of the outer plate and the inner plate of the bulwark, which is conducive to the construction of the double-hull bulwark and the installation of the fairlead hole at the same time, and its one-way curved plate design with a conical bell mouth adapts to the need for variable angles of ropes and has a beautiful appearance; the design of the outer round steel and the inner round steel can form a barrier at the welding point (that is, the corner) between the intermediate cylindrical sealing plate and the inner and outer sealing plates, which is used to withstand the wear caused by rope friction, thereby effectively avoiding the wear of the welding parts between the intermediate cylindrical sealing plate and the inner and outer sealing plates, which reduces the overall strength, rigidity and stability of the fairlead hole. In addition, a plurality of connecting elbow plates are arranged radially at equal angles around the center of the intermediate cylindrical sealing plate, and the four sides of the connecting elbow plates are welded to the outer sealing plate, the intermediate cylindrical sealing plate, the inner sealing plate and the double-hull bulwark respectively. Such a design can support and strengthen the fairlead hole structure.

[0018] It can be seen that the fairlead of the present invention is integrated with the double-hull bulwark structure and can be manufactured and formed in one step on site, avoiding the problem of secondary bulk construction. At the same time, it has high structural strength, rigidity and stability. The specific dimensions of all components (including the double-hull bulwark part, the fairlead part and the connecting bracket) can be CNC-cut off-site, which has high construction precision and good aesthetics, while saving procurement expenses and being economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0020] Figure 1 2. It is a structural schematic diagram of a chock structure of a double-hull bulwark according to an embodiment of the present invention;

[0021] Figure 2 3. This is a schematic structural diagram of the fairlead hole structure of the double-hull bulwark according to an embodiment of the present invention, viewed from outside the ship;

[0022] Figure 3 3. This is a schematic structural diagram of the fairlead structure of the double-hull bulwark according to an embodiment of the present invention, viewed from inboard;

[0023] Figure 4 It is Figure 2 A cross-sectional view of the structure shown along the AA line;

[0024] Figure 5 It is Figure 2 A cross-sectional view of the structure shown along line BB;

[0025] Figure 6 It is Figure 2 A cross-sectional view of the structure shown in CC direction;

[0026] Figure 7 It is Figure 2 A cross-sectional view of the structure along the DD axis is shown.

[0027] Markings in the figure:

[0028] Double hull bulwark portion 1; fairlead portion 2; connecting bracket 3; bulwark outer plate 11; bulwark top plate 12; bulwark inner plate 13; transverse bulkhead 14; plug welding plate 15; outer sealing plate 21; intermediate cylindrical sealing plate 22; inner sealing plate 23; outer round steel 24; inner round steel 25. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] Please also refer to Figures 1 to 7Now, the fairlead hole structure of the double-hull bulwark provided by an embodiment of the present invention is described.

[0034] like Figures 1 to 7 As shown, the fairlead hole structure of the double hull bulwark according to an embodiment of the present invention comprises a double hull bulwark portion 1, a fairlead hole portion 2 and a plurality of connecting brackets 3. The double hull bulwark portion 1 comprises a bulwark outer plate 11, a bulwark top plate 12 and a bulwark inner plate 13 constituting a hollow wall structure; the fairlead hole portion 2 passes through the inner and outer sides of the double hull bulwark portion 1; the fairlead hole portion 2 comprises an outer sealing plate 21, an intermediate cylindrical sealing plate 22, an inner sealing plate 23, an outer round steel 24 and an inner round steel 25; the outer sealing plate 21 and the inner sealing plate 23 are both one-way curved plates with a conical bell mouth; the large-diameter end of the outer sealing plate 21 is welded to the bulwark outer plate 11, and the small-diameter end of the outer sealing plate 21 is welded to the intermediate cylindrical sealing plate 22. The outer end of the cylindrical cover plate 22 is welded; the large-diameter end of the inner cover plate 23 is welded to the bulwark inner plate 13, and the small-diameter end of the outer cover plate 21 is welded to the inner end of the intermediate cylindrical cover plate 22. The outer round steel 24 and the inner round steel 25 are both annular; the outer round steel 24 is welded to the outer end of the intermediate cylindrical cover plate 22; the inner round steel 25 is welded to the inner end of the intermediate cylindrical cover plate 22. Multiple connecting brackets 3 are arranged radially and at equal angles around the center of the intermediate cylindrical cover plate 22. The four sides of each connecting bracket 3 are welded to the outer cover plate 21, the intermediate cylindrical cover plate 22, the inner cover plate 23, and the double-hull bulwark section 1. The outer round steel 24 and the inner round steel 25 are preferably made of high-strength steel.

[0035] According to an embodiment of the present invention, the fairlead hole structure of the double-hull bulwark comprises an outer sealing plate 21, an intermediate cylindrical sealing plate 22, an inner sealing plate 23, an outer round steel 24, and an inner round steel 25 to form the fairlead hole portion 2. The outer sealing plate 21 and the inner sealing plate 23 respectively fill the gaps left in the bulwark outer plate 11 and the bulwark inner plate 13, facilitating simultaneous installation of the fairlead during construction of the double-hull bulwark. Furthermore, the conical, flared, one-way curved plate design accommodates the need for variable rope angles and provides an aesthetically pleasing appearance. The outer round steel 24 and the inner round steel 25 form a barrier at the welds (i.e., corners) between the intermediate cylindrical sealing plate 22 and the inner and outer sealing plates 23, 21, to withstand wear caused by rope friction. This effectively prevents wear at the welds between the intermediate cylindrical sealing plate 22, the inner and outer sealing plates 23, 21, which could reduce the overall strength, rigidity, and stability of the fairlead hole. In addition, multiple connecting brackets 3 are arranged radially and at equal angles around the center of the middle cylindrical sealing plate 22. The four sides of the connecting brackets 3 are welded to the outer sealing plate 21, the middle cylindrical sealing plate 22, the inner sealing plate 23, and the double hull bulwark portion 1. This design can support and strengthen the fairlead hole structure. It can be seen that the fairlead hole of the present invention is integrated with the double hull bulwark structure and can be manufactured and formed on site in one go, avoiding the problem of secondary bulk construction. At the same time, it has high structural strength, rigidity, and stability. The specific dimensions of all components (including the double hull bulwark portion 1, the fairlead hole portion 2, and the connecting brackets 3) can be CNC-cut off-site, which has high construction precision and good aesthetics, while saving procurement expenses and being economical.

[0036] For example, since the variable angle of the inboard rope is generally smaller than that of the outboard rope, the cone angle of the conical bell mouth of the inner sealing plate 23 is smaller than the cone angle of the conical bell mouth of the outer sealing plate 21 .

[0037] Exemplarily, the diameter of the outer round steel 24 is the same as the diameter of the outer end port of the intermediate cylindrical sealing plate 22 to ensure that the outer round steel 24 forms a barrier at the welding point between the outer end port of the intermediate cylindrical sealing plate 22 and the small-diameter end of the outer sealing plate 21 .

[0038] Exemplarily, the diameter of the inner round steel 25 is the same as the diameter of the inner end port of the intermediate cylindrical sealing plate 22 to ensure that the inner round steel 25 forms an effective barrier at the welding point between the inner end port of the intermediate cylindrical sealing plate 22 and the small-diameter end of the inner sealing plate 23.

[0039] Exemplarily, in order to ensure the connection strength between the double hull bulwark part 1 and the fairlead part 2, at least eight connecting brackets 3 are provided.

[0040] Exemplarily, the hole shape of the fairlead hole portion 2 is circular or elliptical, wherein the elliptical design is beneficial to increasing the angle of the cable in the longitudinal range.

[0041] Exemplarily, the double-hull bulwark portion 1 further includes a transverse partition 14 capable of dividing the hollow wall structure formed by the bulwark outer plate 11, the bulwark top plate 12 and the bulwark inner plate 13 into a plurality of cavity structures.

[0042] Exemplarily, in order to enhance the connection strength between the bulwark inner plating 13 and the transverse diaphragm 14, the double-hull bulwark portion 1 further includes a plug welding plate 15. The plug welding plate 15 is located between the bulwark inner plating 13 and the transverse diaphragm 14. The plug welding plate 15 is welded to the transverse diaphragm 14 using double-sided fillet welds, and the plug welding plate 15 is welded to the bulwark inner plating 13 using plug welding.

[0043] Exemplarily, the thickness of the bulwark outer plate 11, the bulwark top plate 12, the bulwark inner plate 13 and the transverse partition 14 close to the fairlead portion 2 is greater than the thickness of the bulwark outer plate 11, the bulwark top plate 12, the bulwark inner plate 13 and the transverse partition 14 away from the fairlead portion 2, so as to ensure the overall strength, rigidity and stability of the fairlead structure.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A fairlead hole structure for a double hull bulwark, characterized in that: It comprises a double-hull bulwark part, a fairlead hole part and a plurality of connecting brackets; the double-hull bulwark part comprises a bulwark outer plate, a bulwark top plate and a bulwark inner plate constituting a hollow wall structure; the fairlead hole part passes through the inner and outer sides of the double-hull bulwark part; the fairlead hole part comprises an outer sealing plate, an intermediate cylindrical sealing plate, an inner sealing plate, an outer round steel and an inner round steel; the outer sealing plate and the inner sealing plate are both one-way curved plates with a conical bell mouth; the large-diameter end of the outer sealing plate is welded to the bulwark outer plate, and the small-diameter end of the outer sealing plate is welded to the outer end port of the intermediate cylindrical sealing plate The large-diameter end of the inner sealing plate is welded to the inner plate of the bulwark, and the small-diameter end of the outer sealing plate is welded to the inner end port of the intermediate cylindrical sealing plate; the outer round steel and the inner round steel are both annular; the outer round steel is welded at the outer end port of the intermediate cylindrical sealing plate; the inner round steel is welded at the inner end port of the intermediate cylindrical sealing plate; a plurality of connecting brackets are arranged radially at equal angles around the center of the intermediate cylindrical sealing plate, and the four sides of the connecting brackets are respectively welded to the outer sealing plate, the intermediate cylindrical sealing plate, the inner sealing plate and the double-hull bulwark portion; The double-hull bulwark portion further includes a transverse partition capable of dividing the hollow wall structure formed by the bulwark outer plate, the bulwark top plate and the bulwark inner plate into a plurality of cavity structures; The double hull bulwark portion further comprises a plug welding plate, the plug welding plate being located between the bulwark inner plate and the transverse bulkhead, the plug welding plate being welded to the transverse bulkhead by double-sided fillet welds, and the plug welding plate being welded to the bulwark inner plate by plug welding; The thickness of the bulwark outer plate, bulwark top plate, bulwark inner plate and transverse partition plate near the fairlead is greater than the thickness of the bulwark outer plate, bulwark top plate, bulwark inner plate and transverse partition plate away from the fairlead.

2. The fairlead structure of the double hull bulwark according to claim 1, characterized in that: The cone angle of the conical bell mouth of the inner sealing plate is smaller than the cone angle of the conical bell mouth of the outer sealing plate.

3. The fairlead hole structure of the double hull bulwark according to claim 1, characterized in that: The diameter of the outer round steel is the same as the diameter of the outer end port of the intermediate cylindrical sealing plate.

4. The fairlead structure of the double hull bulwark according to claim 1, characterized in that: The diameter of the inner round steel is the same as the diameter of the inner end port of the middle cylindrical sealing plate.

5. The fairlead structure of the double hull bulwark according to claim 1, characterized in that: The hole shape of the fairlead hole part is circular or elliptical.

6. The fairlead structure of the double hull bulwark according to claim 1, characterized in that: There are at least 8 connecting brackets.

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