JP2000062683A - Anchoring part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the noise in operations for anchoring and housing the anchor with a simple structure by providing a soft member on at least the inside bottom chord part of a bell mouth constituting an anchoring part. SOLUTION: On at least the inside bottom chord part of a bell mouth 2 constituting an anchoring part, a soft member 4-b is provided. For example, a layer consisting of the soft member 4-b may be provided on only the inside bottom chord part of the surface of the bell mouth 2 or extending over the whole circumference thereof, or the inside bottom chord part or inside whole circumference of the bell mouth 2 may be cut out to fit the soft member 4-b to the cutout part. As the material of the soft member 4-b, any material resistant to the pressure and friction by an anchor chain 3 to some degree can be used without particular limitation. According to this, the friction sound of the anchor chain 3 with the bell mouth 2 or the hammering sound by the intermittent contact of an anchor ring can be reduced in operations for anchoring or housing the anchor.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a new anchor structure for a ship. More specifically, it is an anchor portion structure that can significantly reduce noise when anchoring or storing the anchor. 2. Description of the Related Art Heretofore, as a structure for performing anchoring and anchor storage operations on a relatively large ship, an anchor having a conduit communicating with a bow side plate and a bow deck and providing a passage for an anchor chain has been provided. A part is provided. In addition, the anchoring operation and the storing operation of the anchor,
Generally, this is performed by moving the anchor up and down by a winder of an anchor chain provided on the deck. On the other hand, in such a large ship, an anchor portion is usually constructed by providing a similar iron pipe to an iron hull, and an anchor chain passing through the anchor portion is made of a huge iron. Commonly used. [0004] However, in a ship having the above-mentioned anchoring section, extremely large noise is generated when the anchoring operation and the anchor storing operation are performed (hereinafter referred to as “anchoring etc.”). Its size reaches 100 dB or more at the anchor portion of the source. Conventionally, such noise has been regarded as a problem. However, there has been no example of studying the structure of a ship to solve the problem, and only measures such as restricting the arrival and departure of a large ship at night in an administrative manner have been taken. At present, it is just being done. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an anchoring portion structure which can effectively reduce noise caused by performing an anchoring operation and an anchor storing operation in a ship having the anchoring portion with a simple structure. It is in. [0007] As a result of repeated studies to achieve the above object, the present inventors have found that the main cause of noise at the anchor section is, in particular, a bellmouth at the time of anchoring. The main finding was that it was mainly due to the combination of the friction noise of the anchor chain and the hitting sound due to the intermittent contact of the chain. As a result of further studies, the presence of a soft member at least in the inner lower chord of the bell mouth constituting the anchoring portion can effectively eliminate the above-described noise generation factor, thereby reducing noise. The inventors have found that the present invention exerts remarkable effects, and have completed the present invention. That is, the present invention comprises a conduit for an anchor chain and a bell mouth provided at an end of the conduit on the hull skin side,
An anchor part structure for a hull, wherein a soft member is provided at least in an inner lower chord portion of the bell mouth. Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings, but the present invention is not limited to these embodiments. FIG. 1 is a schematic view of a bow portion including an anchor structure according to a typical embodiment of the present invention. As shown in FIG. 1, the anchor structure of the present invention includes a conduit 1 of an anchor chain 3 and a bell mouth 2 provided at the outer end of the hull of the conduit. As the structure such as the mounting position, size and shape of the conduit 1, a known structure is employed without any particular limitation. For example, the mounting position is determined in consideration of the relationship with the winding device at the position opening to the deck. The position of the opening on the bow side plate is generally the upper part of the bow side plate. Further, the size may be any size that can pass through the anchor chain determined according to the size of the hull. Further, as for the shape, a cross section is generally circular as shown in the drawing, but other shapes such as an ellipse and a square can also be adopted. The bell mouth has a function of preventing the wound-up anchor from coming into contact with the hull 6 and damaging the hull. The structure such as the mounting position, shape, and size of the bellmouth is well known. Is adopted without any particular limitation. For example, the attachment position is provided at the outer end of the hull of the conduit 1 so as to surround at least the lower chord of the conduit. In addition, the shape is an annular body having a thickness as shown in the figure, a shape having a corner of the annular body, a shape in which the thickness of the lower limit of the annular body is increased,
Alternatively, a crescent-shaped convex portion may be formed only in the lower chord portion. In addition, the size may be appropriately determined according to the size of the anchor, and the size that can exhibit the above function may be appropriately determined. Generally, the protrusion length (thickness) of the lower chord portion is determined in the range of 200 to 1000 mm. It is. A feature of the anchor structure according to the present invention resides in that a soft member is present at least in the lower inner chord of the bell mouth 2. Conventionally, in a relatively large ship having an anchoring structure, the bellmouth is made of metal such as iron, and there has been a problem of noise at the time of anchoring. The present invention has been made as a result of a study on the structure of a ship with respect to the above noise.
A soft member is provided on at least the inner lower chord of FIG. 1 (in FIG. 1, the soft member part 4-b is provided only on the inner lower chord of the conduit). In addition, it has a surprising effect that noise can be significantly reduced. In the present invention, the material of the soft member is not particularly limited as long as it has a certain resistance to pressure and friction caused by the anchor chain. Examples of suitable materials include natural rubber, isoprene rubber, styrene butadiene rubber, butadiene rubber, butadiene rubber, chloroprene rubber, butyl rubber, ethylene propylene rubber, ethylene vinyl acetate rubber, chlorosulfonated polyethylene rubber,
Rubbers such as epichlorohydrin rubber, nitrile isoprene rubber, urethane rubber, silicone rubber, and fluorine rubber, polyolefin elastomers, soft polyethylene, linear low density polyethylene, and resins such as nylon 12 are exemplified. In particular, those having a hardness of 20 to 100 Hs, preferably 30 to 80 Hs are preferable because they can exert a good effect on noise prevention. In the present invention, the soft member is not particularly limited as long as it is provided at least on the inner lower chord portion of the bell mouth 2. For example, a mode in which a layer made of a soft member (hereinafter, also referred to as a soft member layer) is provided only on the inner lower chord portion or over the entire circumference on the surface of a conventional bell mouth made of metal such as iron, the inner lower chord portion of the bell mouth Alternatively, there may be a mode in which the entire inner periphery is cut out, and a part made of a soft member (hereinafter, also referred to as a soft member part) is fitted to the cutout portion, and a mode in which the entire bell mouth is formed by the soft member. More specifically, FIG. 1 (FIG. 2 shows an enlarged perspective view thereof) shows a cutout 8 provided in at least the inner lower chord of the bell mouth in the above-described embodiment. It shows an aspect in which soft member parts 4-b are fitted. In a preferred embodiment in which the lower chord portion of the bell mouth 2 is formed of the soft member part 4-b, the notch width of the notch 8 of the bell mouth 2 on the side that contacts the hull side plate (the rear side in the figure) is preferred. In this embodiment, the soft member is fixed to the cutout portion 7 by reducing the width of the notch. In the embodiment in which the entire bell mouth is formed of a soft member, the method of fixing the bell mouth is not particularly limited. In general, known means such as bonding and bolting are employed without particular limitation. Further, in a mode in which the soft member layer is provided only on the inner lower chord portion of the bell mouth 2 or over the entire circumference, the soft member layer may be provided by any known means such as bonding and bolting at any place where the soft member layer does not affect the anchoring. What is necessary is just to fix by, etc. FIG. 3 is a cross-sectional view showing a preferred embodiment in which the soft member is provided by covering the lower inner chord portion of the bell mouth 2 with the soft member layer 4-a in the anchor portion structure of the present invention. FIG. 4 is a cross-sectional view of a portion of the conduit 1 of the above embodiment. In the embodiment shown in FIG. 3, the soft member layer 4-a
Is provided on the inner lower chord surface of the bell mouth 2, and is further extended and provided on the inner lower chord of the conduit 1. As described above, it is preferable to extend the soft member layer 4-a also on the lower chord inside the conduit 1, since the noise prevention effect can be further improved. Also, when fixing the soft member layer 4-a, one end is fixed below the bell mouth and the other end is fixed near the deck side of the conduit 1, so that the fixing part is not damaged by the sliding of the anchor chain 3. There is a merit that the durability is improved without being received. In the present invention, as described above, in the embodiment in which the soft member layer 4-a is provided in the conduit 1, the material of the conduit 1 is a known material, that is, a metal material represented by iron. It is desirable to configure. In the present invention, as described above, it is preferable to provide a soft member at least in the lower inner chord portion of the conduit together with the bell mouth in order to further enhance the effect of preventing noise at the time of anchoring. And various embodiments. For example, FIG. 5 shows a conduit 1 in addition to the embodiment in which the soft member part 4-b shown in FIG.
A cross-sectional view of an embodiment in which a tube constituting the soft member layer 4-a is provided therein and the soft member is present on the entire inner periphery thereof. still,
FIG. 6 is a cross-sectional view of a portion of the conduit 1 of the above embodiment. In the present invention, in the above-described embodiment in which the soft member layer 4-a is provided in the conduit 1, the soft member layer 4-a is not entirely fixed to the inner surface of the conduit 1, but is partially fixed. Is preferred. That is, providing the soft member layer loosely with respect to the conduit has an effect of absorbing noise at the time of anchoring even in such a gap, and is more effective in preventing noise. As a preferred embodiment for partially fixing the soft member layer, the embodiment shown in FIG. 3 includes an embodiment in which the two points on the deck side and the bellmouth side are fixed as described above. Further, in the embodiment shown in FIG.
At least a part thereof is projected to the inside from the conduit 1 and held by a stopper formed, or a flange 7 is provided at the other end and held as a deck-side stopper, or both of them are adopted. Is preferred. In this case, the flange portion 7 of the tube constituting the soft member layer 4-a is
It may be fixed to the hull deck by known fixing means such as bonding and bolting. As a mode in which the soft member is present at least in the lower inner chord portion of the conduit, a mode in which the lower chord portion of the conduit or the entire conduit is made of a soft member can be adopted. Considering the above, it is most preferable that the conduit 1 is made of a metal material as described above and a soft member layer is provided inside the conduit. In the present invention, the thickness of the soft member that may be present in the bell mouth 2 and possibly also in the conduit 1 depends on the material, but is generally 10 mm or more, preferably 3 mm or more.
0 mm or more, particularly preferably 40 mm or more is suitable. In the present invention, it is preferable to form a wear-resistant member layer on the surface of the above-mentioned soft member in order to improve the wear resistance of the soft member and to impart the durability thereof. FIG. 7 shows a typical embodiment in which the wear-resistant member layer 9 is provided in the anchor portion structure shown in FIG. The above-mentioned wear-resistant member layer may be provided so as to cover at least the inner lower chord of the soft member of the bell mouth, but may be provided so as to cover the entire soft member as shown in FIG. . It is desirable that the wear-resistant member layer be provided with a thickness that does not significantly impede the noise prevention effect of the soft member when anchoring. Generally, it is recommended to provide a thickness of about 1 to several tens mm, preferably 1 to 30 mm. As a material of the wear-resistant member layer, a known wear-resistant material is used without any particular limitation. Specifically, among them, high molecular weight polysiloxane-containing olefin resin,
Fluorinated resin, resin such as nylon 6, nylon 66,
Iron, stainless steel, copper and the like are preferably used. Among these materials, resins which generate less secondary noise are preferable, and among them, high-molecular-weight polysiloxane-containing olefin resins having good slipperiness are preferable. Furthermore, the method of attaching the wear-resistant member layer is not particularly limited, such as lining the entire surface of the soft member, partial adhesion shown as the above-mentioned means for fixing the soft member layer, loose fixing means such as bolting, and the like. It is not something to be done. As described above, by forming the wear-resistant member layer on the surface of the soft member, the durability of the soft member can be remarkably improved, and unexpectedly, the effect of preventing noise at the time of anchoring or the like can also be improved. It has the effect of improving. As for other structures associated with the anchor portion structure of the present invention, for example, a winding device for the anchor chain, a guide for introducing the anchor chain from the winding device to the conduit, and the like, a known structure is used without any particular limitation. . In a ship using the above guide, a metal guide such as iron is usually used as such a guide, and here, there are some factors that cause noise due to sliding of the anchor chain. Therefore, it is more effective to prevent the noise from having the soft member also on the upper surface of the guide. EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to these Examples. Example 1 The anchor structure shown in FIG. 1 was applied to the hull of an iron ship.
That is, as the conduit 1, an iron tube having an inner diameter of 340 mm and a thickness of 10 mm was used. The bell mouth 2 is made of iron and has a lower chord having a thickness of 500 mm, is provided with a notch 8 shown in FIG. 2, and is provided with a butadiene rubber having a thickness of 50 mm and a hardness of 60 Hs to form a soft member part 4. b was formed. An anchor having a weight of 1 t was connected to the tip of the anchor, and the chain had a thickness of 35 mm, a major axis of 190 mm, and a minor axis of 114.
The anchor chain 3 of mm was anchored. At the time of the above anchoring, the loudness of the sound measured at a position 7 m away was 87 dB. Example 2 An anchor structure shown in FIG. 3 was applied to the hull of an iron ship.
That is, a half pipe (thickness: 15 mm) made of butadiene rubber having a hardness of 60 Hs is piped to an inner lower chord portion of an iron conduit 1 having an inner diameter of 340 mm and a thickness of 10 mm and a bell mouth 2 made of iron and having a lower chord portion having a thickness of 500 mm. Was provided over the entire length from one end to cover the multi-end bell mouth, and both ends were fixed with bolts to form a soft member layer 4-a. The same anchor chain as in Example 1 was used at the anchor section and anchoring was performed under the same conditions. As a result, the loudness at a position 7 m away was 82 dB. Comparative Example 1 In Example 2, the same anchor chain as in Example 1 was used without providing the soft member layer 4-a, and anchoring was performed under the same conditions. As a result, the sound at a position 7 m away was obtained. Was 102 dB. Example 3 In the anchor structure shown in Example 2, the soft member layer 4-
The end of a 25 mm thick half-pipe made of nylon 66 was worked on the surface of a as a wear-resistant member layer and fixed to the deck and the lower end of the bell mouth to form an anchor structure. The same anchor chain as in Example 1 was used at the anchor section and anchoring was performed under the same conditions. As a result, the loudness at a position 7 m away was 79 dB. Further, as a result of repeating the anchoring operation 50 times, no damage occurred at the anchoring portion. As will be understood from the above description, the anchor structure according to the present invention has a remarkable effect of reducing noise at the time of anchoring and the like, and has an extremely effective effect on the surrounding noise at the time of stopping the ship. It is possible to relax. In particular, in the embodiment in which the wear-resistant member layer is provided on the surface of the soft member, an excellent effect that the noise reduction effect can be further improved as well as the durability is exhibited.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a typical embodiment of the anchor structure of the present invention. FIG. 2 is a perspective view showing a typical embodiment of a bell mouth used in the anchor structure of the present invention. FIG. 3 is a cross-sectional view showing a typical embodiment of the anchor structure of the present invention. FIG. 4 is a cross-sectional view of a conduit portion in FIG. 3; FIG. 5 is a cross-section showing a typical embodiment of the anchor structure of the present invention. FIG. 6 is a cross-sectional view of the conduit portion in FIG. 5 FIG. 7 is a cross-sectional view showing a typical embodiment of the anchoring portion structure of the present invention [Description of symbols] 1 conduit 2 bell mouth 3 anchor chain 4-a soft member Layer 4-b Soft member parts 5 Anchor 6 Hull 7 Flange 8 Notch 9 Wear-resistant member layer

Claims (1)

Claims: 1. A cable comprising an anchor chain conduit and a bell mouth provided at an end of the conduit on the hull outer plate side, wherein a soft member is present at least in an inner lower chord of the bell mouth. Anchor structure of the hull. 2. The anchor structure according to claim 1, wherein a cutout portion is provided in an inner lower chord of the bell mouth, and a soft member is fitted into the cutout portion. 3. The anchor structure according to claim 1, wherein a soft member is present at least in the lower inner chord of the conduit. 4. The anchor structure according to claim 1, wherein the soft member is made of rubber. 4. The anchor structure according to claim 1, wherein the soft member has a thickness of 10 mm or more. 6. The anchor structure according to claim 1, wherein a layer made of a soft member is provided so as to continuously cover at least the inner lower chord of the conduit and the bell mouth. 7. An anchor structure according to claim 1, wherein a wear-resistant member layer is formed on a surface of the soft member. 8. The anchor structure according to claim 7, wherein the wear-resistant member is made of a hard resin.