JP2012071696A - Ship, and method for reducing wind resistance of the ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ship having a very simple structure capable of reducing its wind resistance without impairing operability of a cargo handling crane, and improving its fuel consumption, and a method for reducing its wind resistance.SOLUTION: In the ship which is equipped with the cargo handling crane 10 and in which the horizontal section of a rotary post 12 of the cargo handling crane 10 is formed in a polygonal shape, a single or a plurality of wind resistance reducing covers 20 with its horizontal sectional shape covering a corner part being arc-shaped, elliptical-shaped or streamline shaped are attached to the side forming a bow side when accommodating the jib of the cargo handling crane of the rotary post 12 during navigation.

Description

  The present invention relates to a ship capable of reducing wind pressure resistance of a ship in operation without impairing workability of a cargo handling crane and improving fuel efficiency, and a method of reducing wind pressure resistance of a ship.

  Cargo ships such as bulk carriers often have cargo handling cranes called cargo gears, deck cranes, jib cranes, etc., for loading and unloading bulk cargo. As shown in FIGS. 18 to 20, this cargo handling crane 10 </ b> X has a rotatable post 12 </ b> X mounted on a lower post 11 fixed on a deck of a hull. The rotary post 12X includes a jib 13, a driver's seat 14, and a wire 15, and changes the angle of attack and the depression angle of the jib 13 by the feeding and feeding of the wire 15 that hangs the tip of the jib 13, and the suspension post 12X. By lifting and unwinding the wire 15 that hangs the hook 16, the hanging hook 16 can be lifted up and down for cargo handling. The lower post 11 is provided with a maintenance stage 11a.

  The cargo handling crane 10X includes a mechanism for rotationally driving the rotary post 12X, a wire 15 for swinging in the vertical plane of the jib 13 that moves up and down the tip of the jib 13 (changing the depression angle or elevation angle), a winch, and the jib 13 A wire 15 and a winch for moving up and down a hook 16 suspended at the tip of the door, a control device for controlling these, and a driver's seat (cabin) 14 are formed (for example, see Patent Documents 1 and 2). .)

  In addition, this cargo handling crane is installed in the center in the lateral direction (left and right side) of the hull between the cargo holds, and the jib is hulled so as not to obstruct the view from the bridge as much as possible while navigating the ship. Is stored at a position along the center line as much as possible (see, for example, Patent Document 3).

  On the other hand, in ship resistance propulsion, there are wave resistance, frictional resistance, and the like as resistance components of a ship during navigation, but wind pressure resistance is also a resistance that cannot be ignored. Therefore, it is also important to reduce the wind pressure resistance during navigation in order to improve the resistance propulsion performance of the ship and reduce fuel consumption.

  Regarding the wind pressure resistance, a ship having a plurality of cargo handling cranes has a large protrusion on the ship, and the influence of the wind pressure resistance of the cargo handling crane on the wind pressure resistance of the entire ship is increased. In other words, the wind pressure resistance of the cargo handling crane contributes to the resistance of the ship.

Japanese Utility Model Publication No. 62-83093 Japanese Utility Model Publication No. 62-194690 Japanese Utility Model Publication No. 62-16594

  In view of the above situation, the inventors of the present invention pay attention to the wind pressure resistance of a cargo handling crane, which was not regarded as important in the prior art, and the horizontal sectional shape of the rotary post of the conventional cargo handling crane It is often formed in a quadrangular shape or an octagonal shape for reasons such as easier to manufacture by laminating flat plates than bending using a bending machine, and resistance due to eddy currents generated from these corners is As a result of experiments and numerical calculations on the assumption that the wind pressure resistance was increased, the following knowledge was obtained. In other words, by attaching a wind pressure reducing cover composed of one or more of a cylindrical shape, a conical shape, or a streamlined shape to the windward side of the rotating post, or the side that becomes the windward side of the horizontal cross-sectional shape of the rotating post is a cylinder The formation of the shape, conical shape, or streamlined shape significantly reduced the wind pressure resistance of the cargo handling crane, and obtained knowledge that it can greatly contribute to the reduction of the wind pressure resistance of the ship.

  An object of the present invention is to provide a ship that can reduce wind pressure resistance of a ship and can improve fuel consumption without impairing workability of a cargo handling crane with a very simple configuration, and a resistance reduction method thereof. It is in.

  In order to achieve the above object, a ship according to the present invention includes a cargo handling crane, and the cargo handling crane during navigation of the rotary post in a ship in which a horizontal section of the rotary post of the cargo handling crane is formed in a polygonal shape. A wind pressure reduction cover composed of one or a plurality of horizontal cross-sectional shapes covering the corners in an arc shape, an elliptic arc shape, or a streamline shape is attached to the side that becomes the bow side when the jib is stored.

  By installing one or more wind pressure reduction covers on the windward side, the vortex generated at the corners of the rotating posts is reduced, and the wind pressure resistance of the rotating posts is significantly reduced, reducing the overall resistance of the ship. Can improve fuel efficiency. Further, since this wind pressure reduction cover can be additionally provided even in an existing ship, the wind pressure resistance of the existing ship can be reduced by a very simple construction, and the fuel efficiency improvement effect can be exhibited.

  In the above-mentioned ship, the wind pressure reduction cover is provided so as to be rotatable around the rotary post, and the wind direction during navigation is detected, and the wind pressure reduction cover is rotationally controlled to face the windward side. To do. With this configuration, the wind pressure reduction cover can be arranged on the side that becomes the bow side when the jib is stored in the cargo handling crane, following the jib storage direction of the cargo handling crane during navigation.

  For example, this rotatable wind pressure reduction cover is provided with rails on the upper and lower peripheries of the rotating post (house), and the wind pressure reducing cover is fixed to a movable carriage that moves along the rail. A wind pressure reduction cover is arranged around the vehicle, and the moving carriage is controlled to move so that the wind pressure reduction cover faces the wind direction detected by the ship's anemometer.

  The wind pressure reduction cover is shaped so as not to interfere with the upper cargo handling wire, the lower jib, and the central driver's seat (control room) when rotated to the jib side. In addition, the portion of the wind pressure reduction cover that covers the driver's seat should be transparent using a transparent material such as acrylic glass, so that even if the rotation mechanism of the wind pressure reduction cover is obstructed, the cargo handling operation will be affected. It is preferable not to do so.

  Further, preferably, in the above-mentioned ship, an upper cover having an opening through which a cargo handling wire can pass is provided on the jib side at the upper part of the rotating post to suppress the generation of vortex in the upper opening of the wind pressure reducing cover. To do. In addition, it is preferable to bend the edge part of the front-end | tip part of an upper cover, and the edge part of the opening for wires so that the airflow which flows out from these edge parts may not generate | occur | produce a vortex. Further, a bottom cover that covers the lower opening of the wind pressure reduction cover is provided to suppress the generation of vortices in the lower opening. The bottom cover is provided with a drainage hole for drainage so that rainwater does not collect.

  Alternatively, a ship according to the present invention for achieving the above object is a ship equipped with a cargo handling crane, wherein the rotary post has a horizontal cross-sectional shape, and a portion that becomes the stern side when the jib of the cargo handling crane during navigation is stored in a polygon is polygonal. The shape and the portion on the bow side when the jib is stored in the cargo handling crane during navigation are formed in a horizontal cross-sectional shape for wind pressure reduction that is circular, elliptical, or streamlined.

  The rotating post formed on the bow side of the sailing cargo crane during jib storage, i.e., the windward side with a horizontal cross-section for reducing wind pressure, is on the side that becomes the bow side of the sailing cargo crane during storage. Since the wind pressure resistance is remarkably reduced as compared with a rotating post having a horizontal cross section in a polygonal shape, it is possible to contribute to a reduction in the resistance of the ship as a whole, and to improve fuel efficiency.

  Also, compared to a rotating post that has a circular shape as a whole, one half has a polygonal shape, so workability is high, and the other half is also a half of a cylindrical shape or a circular shape. Since it can be manufactured relatively easily by roll processing, the workability is increased and it is easy to manufacture.

  In order to achieve the above object, a wind pressure resistance reduction method for a ship according to the present invention comprises a cargo handling crane, and the wind pressure resistance reduction method for a ship in which a horizontal section of a rotating post of the cargo handling crane is formed in a polygonal shape. A wind pressure reduction cover composed of a single or a plurality of horizontal cross-sections having an arc shape, an elliptic arc shape, or a streamline shape is attached to the side that becomes the bow side when the jib of the cargo handling crane is retracted during navigation of the rotating post. It is the method characterized by this.

  According to this wind pressure reduction method for a ship, by attaching a wind pressure reduction cover on the windward side, the vortex generated at the corner of the rotary post is reduced and the wind pressure resistance of the rotary post is remarkably reduced. Resistance can be reduced and fuel consumption can be improved. In addition, since the wind pressure reduction cover composed of one or more can be additionally installed in existing ships, the wind pressure resistance of existing ships can be reduced with very simple construction, and the fuel efficiency improvement effect can be achieved. Can demonstrate.

  In the ship wind pressure reduction method described above, if the wind direction during navigation is detected and the wind pressure reduction cover provided rotatably around the rotation post is controlled to turn to the windward side, The wind pressure reduction cover can always be directed to the windward side even when the wind direction changes in the interior, so that not only the wind direction on the bow side but also the wind direction including crosswinds can be obtained. Will be able to.

  Alternatively, a wind pressure resistance reducing method for a ship according to the present invention for achieving the above object is the method for reducing wind pressure resistance of a ship provided with a cargo handling crane, wherein the horizontal cross-sectional shape of the rotary post is the same as that of the cargo handling crane during navigation. The part that becomes the stern side when the jib is stored is polygonal, and the part that becomes the bow side when the jib is stored is circular, elliptical, or streamlined in the horizontal cross-sectional shape for wind pressure reduction. It is the method characterized by doing.

  According to this ship resistance reduction method, the rotating post in which the bow side, that is, the windward side is formed in a horizontal cross section for reducing wind pressure when the cargo handling crane during navigation is stored in the jib is loaded with the cargo handling crane during navigation. The wind pressure resistance is significantly reduced compared to a rotating post with a horizontal cross section that is polygonal on the side that becomes the bow side when retracting the jib, thus contributing to a reduction in the overall resistance of the ship and improving fuel efficiency. Can be planned.

  Also, compared to a rotating post that has a circular shape as a whole, one half has a polygonal shape, so workability is high, and the other half is also a half of a cylindrical shape or a circular shape. Since it can be manufactured relatively easily by roll processing, the workability is increased and it is easy to manufacture.

  According to the ship and the wind pressure resistance reducing method of the ship of the present invention, the wind pressure resistance of the ship can be reduced and the fuel consumption can be improved with a very simple configuration without impairing the workability of the cargo handling crane. Therefore, it becomes an energy-saving ship.

It is the perspective view which showed typically the structure of the rotation post of the cargo handling crane of the ship in 1st Embodiment which concerns on this invention. It is the horizontal sectional view which showed typically the external shape of the rotation post of the cargo handling crane of FIG. It is the perspective view which showed typically the structure of the rotation post of the cargo handling crane of the ship in 2nd Embodiment which concerns on this invention. It is the horizontal sectional view which showed typically the horizontal cross-sectional shape for the wind pressure reduction of the rotation post of the cargo handling crane of FIG. It is the perspective view which showed typically the structure of the rotation post of the cargo handling crane of the ship in 3rd Embodiment which concerns on this invention. It is a side view which shows typically the range of the wind pressure reduction cover of FIG. It is the perspective view which showed typically the mode of the movement of the wind pressure reduction cover of FIG. It is the side view which showed typically the 1st example of the storing position of the cargo handling crane during navigation of a ship. It is the top view which showed typically the storing position of the cargo handling crane of FIG. It is the front view which showed typically the storing position of the cargo handling crane of FIG. It is the side view which showed typically the 2nd example of the storage position of the cargo handling crane during navigation of a ship. It is the top view which showed typically the storing position of the cargo handling crane of FIG. It is the front view which showed typically the storing position of the cargo handling crane of FIG. It is the side view which showed typically the 3rd example of the fixed position of the cargo handling crane during navigation of a ship. It is the top view which showed typically the storing position of the cargo handling crane of FIG. It is the front view which showed typically the storing position of the cargo handling crane of FIG. It is the figure which showed the wind pressure resistance coefficient during the navigation of the ship in 1st Embodiment based on this invention. It is a side view which shows the structure of a general cargo handling crane. It is a front view of the cargo handling crane of FIG. It is a top view of the rotation post part of the cargo handling crane of FIG.

  Hereinafter, a ship according to the present invention and a wind pressure resistance reduction method for a ship will be described with reference to the drawings. In FIG. 10, FIG. 13 and FIG. 16, the bridge and the residential area are omitted in order to make the projected area of the cargo handling crane stand out.

  First, the ship according to the first embodiment and the wind pressure resistance reduction method for the ship will be described. As shown in FIG. 1, a ship 1 according to a first embodiment of the present invention includes a cargo handling crane 10 having a lower post 11, a rotating post 12, a jib 13, and a driver's seat 14. The cargo handling crane 10 is called a cargo gear, a deck crane, a jib crane, or the like. As with the cargo handling crane 10X shown in FIGS. 18 to 20, the cargo handling crane 10 has a rotating post 12 mounted on the lower post 11 fixed on the deck of the hull, and the jib 13 and the rotating post 12 are operated. A seat 14 and a wire 15 are provided.

  The rotating post 12 of the cargo handling crane 10 is formed in a truncated pyramid shape whose horizontal cross section is formed in a polygon (an octagon in FIGS. 1 and 2) such as a quadrangle and an octagon, and is fixed to the hull. It is rotatably installed on the post 11. The lower post is provided with a maintenance stage 11a. A jib 13 is attached by a hinge portion 13a provided on the rotating post 12 side, and a driver's seat (cabin) 14 is provided on the side of the rotating post 12 on which the jib 13 is attached.

  Then, the angle of attack and the depression angle of the jib 13 are changed by the feeding and feeding of the wire (not shown in FIG. 1) that suspends the tip of the jib 13, and the suspension hook (not shown in FIG. 1) is suspended. This hanging hook can be lifted and lowered by unwinding and unwinding the wire (not shown in FIG. 1).

  As shown in FIG. 1 and FIG. 2, the ship 1 is composed of one or more horizontal cross sections that are arc-shaped, elliptical arc-shaped, or streamlined on the windward side, that is, the side that becomes the bow side. A wind pressure reduction cover 20 is attached.

  The wind pressure reduction cover 20 preferably covers a range of 30% or more and 100% or less of the height range of the rotary post 12, and if it is 30% or less, the weight increase due to the attachment of the wind pressure reduction cover 20 or construction costs, etc. In comparison, the wind pressure resistance reduction effect is low. If it is smaller than 100%, the wind speed below the rotating post 12 becomes smaller due to the influence of the boundary layer on the deck of the hull, and the effect of reducing the wind pressure resistance is reduced, so it is better to cover the upper end side of the rotating post 12. preferable. Further, the wind pressure reducing cover 20 may be attached to the lower post 11 in the same manner as the rotating post 12.

  The wind pressure reduction cover 20 makes the wind flow smooth, reduces the vortex generated at the corners of the rotating post 12, and significantly reduces the wind pressure resistance of the rotating post 12, thereby reducing the overall resistance of the ship 1. Can improve fuel efficiency. Further, since the wind pressure reduction cover 20 constituted by one or a plurality is arranged so as not to interfere with the maintenance stage 11a, workability of the cargo handling work of the cargo handling crane 10 is not deteriorated.

  Furthermore, since the wind pressure reduction cover 20 composed of one or more can be additionally provided in an existing ship, it is very easy to add the wind pressure reduction cover 20 composed of one or more. The wind pressure resistance of the existing ship 1 can be reduced by the construction, and the fuel efficiency improvement effect can be exhibited.

  The ship wind pressure resistance reduction method using the wind pressure reduction cover 20 of the first embodiment includes the cargo handling crane 10 and the horizontal cross section of the rotary post 12 of the cargo handling crane 10 is formed in a polygonal shape. A method for reducing wind pressure resistance of a ship 1, wherein a horizontal cross-sectional shape is a circular arc shape, an elliptical arc shape, or a streamline shape on the side that becomes the bow side when the jib 13 of the cargo handling crane 10 during navigation of the rotary post 12 is retracted. In this method, a plurality of wind pressure reduction covers 20 are provided.

  8 to 10, FIGS. 11 to 13, and FIGS. 14 to 16 show examples of the cargo handling crane 10 during navigation of the ship 1 when the jib 13 is stored.

  Next, a ship according to a second embodiment and a wind pressure resistance reduction method for the ship will be described. The ship 1A according to the second embodiment of the present invention includes the lower post 11, the rotating post 12A, the jib 13, the driver's seat 14, the wire 15, and the hanging hook 16 in the same manner as the ship 1 according to the first embodiment. The cargo handling crane 10A is provided.

  As shown in FIGS. 3 and 4, the rotary post 12 </ b> A of the cargo handling crane 10 </ b> A according to the second embodiment has the horizontal cross-sectional shape of the rotary post 12 </ b> A on the stern side when the jib 13 of the cargo handling crane 10 is in navigation. The portion 12a is formed in a polygonal shape, and the portion 12Ab on the bow side when the jib 13 of the cargo handling crane 10 during navigation is stored is formed in a horizontal cross section for wind pressure reduction having a circular shape, an elliptical shape, or a streamlined shape. .

  As shown in FIGS. 3 and 4, the horizontal cross section of the portion 12 Ab on the bow side, that is, the windward side when the jib 13 of the cargo handling crane 10 during navigation is stored is formed in a circular shape, an elliptical shape, or a streamlined shape. Since the rotating post 12A has a significantly reduced wind pressure resistance compared to a rotating post having a horizontal cross section of a polygonal shape on the side that becomes the bow side when the jib 13 of the cargo handling crane 10 is in navigation, 1A as a whole can contribute to a reduction in resistance and can improve fuel efficiency.

  In addition, compared to a rotating post having a circular shape as a whole, one half has a polygonal shape, so that workability is high, and the other half is also a cylindrical half or circular shape. Since it becomes a half of the shape and the like and can be manufactured relatively easily by roll processing, the workability is increased and the manufacturing becomes easy.

  A portion 12Ab in which the horizontal cross section of the rotating post 12A is formed in a circular shape, an elliptical shape, or a streamlined shape is disposed on the windward side to reduce the wind pressure resistance of the rotating post 12A.

  Other configurations of the cargo handling crane 10A of the second embodiment are configured in the same manner as the cargo handling crane 10 of the first embodiment.

  It is preferable that the substantially half of the horizontal section having a circular shape, an elliptical shape, or a streamline shape covers a range of 30% to 100% of the range in the height direction of the rotary post 12A. The effect of reducing wind pressure resistance is low compared to the construction cost of forming a horizontal section. In the case where it is smaller than 100%, the wind speed below the rotary post 12A becomes smaller due to the influence of the boundary layer on the deck of the hull, and the effect of reducing the wind pressure resistance is reduced. . Further, in the lower post 11, like the rotary post 12, the windward side may be formed in a horizontal cross-sectional shape for reducing wind pressure.

  Due to the horizontal cross-sectional shape for reducing wind pressure, the vortex generated at the corner on the upstream side of the rotary post 12A is reduced and the wind pressure resistance of the rotary post 12A is remarkably reduced. Therefore, the overall resistance of the ship 1A can be reduced, Fuel consumption can be improved.

  Further, the wind pressure resistance reduction method for a ship using the horizontal cross section for wind pressure reduction according to the second embodiment is a wind pressure resistance reduction method for the ship 1 provided with the cargo handling crane 10A, and the horizontal cross section of the rotary post 12A. The portion 12Aa which becomes the stern side when the jib 13 of the cargo handling crane 10 during navigation is retracted is a polygonal shape, and the portion 12Ab which becomes the bow side when the jib 13 of the cargo handling crane 10 which is navigating is circular or elliptical. Or it is the method of forming in the horizontal cross-sectional shape for wind pressure reduction which is a streamlined shape.

  Next, a ship according to a third embodiment and a wind pressure resistance reducing method for the ship will be described. A ship 1B according to the third embodiment of the present invention includes a lower post 11, a rotating post 12B, a jib 13, a driver's seat 14, a wire 15, and a hanging hook 16 as in the case of the ship 1 according to the first embodiment. The cargo handling crane 10B is provided.

  In this ship 1B, as shown in FIGS. 5-7, while providing the wind pressure reduction cover 20B around the rotation post 12B so that rotation is possible, the wind direction during navigation is detected and the wind pressure reduction cover 20B is installed on the windward side. It is comprised so that rotation control may be carried out so that it may face. With this configuration, the wind pressure reduction cover 20B can be disposed on the side that becomes the bow side when the jib 13 of the cargo handling crane 10B is retracted, following the retracting direction of the jib 13 of the cargo handling crane 10B that is being navigated.

  This rotatable wind pressure reduction cover 20B is provided with rails 20Ba, 20Bb on the outer periphery of the upper and lower portions of the rotating post (house) 12B, and the wind pressure reduction cover 20B is moved to the movable carriage 20Bd moving along the rails 20Ba, 20Bb. Is fixed, the wind pressure reduction cover 20B is disposed around the rotary post 12B, and the moving carriage 20Bd is controlled to move so that the wind pressure reduction cover 20B faces the wind direction detected by the anemometer of the ship 1B.

  The wind pressure reduction cover 20 </ b> B is shaped so as not to interfere with the upper cargo handling wire 15, the lower jib 13, and the central driver's seat (control room) 14 when rotated to the jib 13 side. In addition, the portion 20Bc that covers the driver's seat 14 of the wind pressure reduction cover 20B is made transparent using a transparent material such as acrylic glass, so that even if the rotation mechanism of the wind pressure reduction cover 20B is obstructed, the cargo handling work is performed. So that it will not be affected. As shown in FIG. 5, the transparent portion 20Bc may be provided in a band shape over the entire periphery of the wind pressure reducing cover 20B, or may be provided in a window shape as shown in FIGS.

  Further, in the ship 1B, an upper cover (not shown) having an opening through which the cargo handling wire 15 can pass is provided on the jib 13 side above the rotating post 12B, and the vortex in the upper opening of the wind pressure reducing cover 20B is provided. It is preferable to suppress the occurrence of. In addition, it is preferable to bend the edge part of the front-end | tip part of an upper cover, and the edge part of the opening for wires 15 so that the airflow which flows out from these edge parts may not generate a vortex. Further, it is preferable to provide a bottom cover (not shown) that covers the lower opening of the wind pressure reducing cover 20B to suppress the generation of vortices in the lower opening. The bottom cover is provided with a drainage hole for drainage so that rainwater does not collect.

  In addition, the ship wind pressure resistance reducing method using the wind pressure reducing cover 20B of the third embodiment includes the cargo handling crane 10B, and the horizontal cross section of the rotary post 12B of the cargo handling crane 10B is formed in a polygonal shape. A method of reducing wind pressure resistance of a ship 1B, wherein the horizontal cross-sectional shape is an arc shape, an elliptical arc shape, or a streamline shape on the side that becomes the bow side of the loading crane 10B during navigation of the rotary post 12B when retracted. A method of attaching a plurality of wind pressure reduction covers 20B, detecting the wind direction during navigation, and controlling the rotation so that the wind pressure reduction cover 20B provided to be rotatable around the rotary post 12B faces the windward side. It is.

  According to this method, the wind pressure reduction cover 20B can always be directed toward the windward side even when the wind direction changes during navigation, so that not only the wind direction on the bow side but also the wind direction including crosswinds and the like. Also. A wind pressure reduction effect can be obtained.

  According to the above-mentioned ship 1, 1A, 1B and ship wind resistance reduction method, the wind pressure resistance of the ships 1, 1A, 1B can be reduced with a very simple configuration without impairing the workability of the cargo handling cranes 10, 10A, 10B. The fuel consumption can be improved. Therefore, it becomes an energy-saving ship.

  FIG. 17 shows the test results of the wind tunnel test of the ship 1X of the prior art and the ship 1 of the first embodiment in terms of the wind pressure resistance coefficient when the wind direction θ shown in FIG. 2 is changed. Compared with the wind pressure resistance coefficient (square mark and B) of the ship 1X when using the prior art cargo handling crane 10X, the overall wind pressure resistance coefficient (circle mark and A) of the ship 1 of the first embodiment is It was found that the wind pressure resistance coefficient was reduced by about 5% or more at the maximum.

The wind pressure coefficient Cx is expressed as follows: S = wind pressure area (projected area of the ship 1 when viewed from the front), wind speed V, air density ρ, and wind pressure resistance of the ship 1 D = (1 / 2) It becomes the relationship of * (rho) * V < ² > * S * Cx.

  The ship of the present invention and its resistance reduction method can reduce wind pressure resistance of the ship and improve fuel consumption without impairing the workability of the cargo handling crane with a very simple configuration. And its resistance reduction method.

1, 1A, 1B, 1X Vessel 10, 10A, 10B, 10X Handling crane 11 Lower post 11a Maintenance stage 12, 12A, 12B, 12X Rotating post 12Aa Horizontal section in polygonal shape 12Ab Horizontal section in arc shape or elliptic arc shape Or a streamlined portion 13 Jib 14 Driver's seat 15 Wire 16 Hanging hook 20, 20B Wind pressure reducing cover 20Ba, 10Bb Rail 20Bc A portion covering the driver's seat 20Bd Moving carriage

Claims (6)

  In a ship provided with a cargo handling crane and the horizontal section of the rotary post of the cargo handling crane is formed in a polygonal shape, a corner is provided on the side that becomes the bow side when the cargo handling crane is in jib storage during navigation of the rotary post. A ship equipped with a wind pressure reduction cover composed of one or more horizontal cross-sectional shapes covering a circular arc shape, an elliptical arc shape, or a streamline shape.   2. The wind pressure reduction cover is provided so as to be rotatable around the rotary post, and the rotation of the wind pressure reduction cover is controlled so as to face the windward side by detecting the wind direction during navigation. The listed ship.   In a ship equipped with a cargo handling crane, the horizontal post of the rotary post has a polygonal shape on the stern side when the jib of the cargo handling crane during navigation is stored, and the bow of the cargo handling crane during navigation when the jib is stored The ship which forms in the horizontal cross-sectional shape for wind pressure reduction whose part used as a side is circular shape, elliptical shape, or a streamlined shape.   In the method for reducing wind pressure resistance of a ship provided with a cargo handling crane and the horizontal section of the rotary post of the cargo handling crane is formed in a polygonal shape, the side which becomes the bow side when the jib of the cargo handling crane is stored during navigation of the rotary post A wind pressure resistance reducing method for a ship, further comprising a wind pressure reducing cover composed of one or a plurality of horizontal cross-sections having an arc shape, an elliptic arc shape, or a streamline shape.   5. The wind pressure resistance of a ship according to claim 4, wherein the wind direction during navigation is detected, and the wind pressure reduction cover provided rotatably around the rotary post is controlled to turn to the windward side. Reduction method.   In the method for reducing wind pressure resistance of a ship equipped with a cargo handling crane, the horizontal cross-sectional shape of the rotary post is a polygonal shape in which the portion on the stern side when the jib of the cargo handling crane is stored is in a stern side, and the cargo handling crane being navigated A method for reducing wind pressure resistance of a ship, characterized in that a portion on the bow side when the jib is stored is formed in a horizontal cross-sectional shape for wind pressure reduction that is circular, elliptical, or streamlined.

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