JPH0840354A - Mooring device for float - Google Patents

Abstract

PURPOSE:To prevent a bearing base of a mooring roller from vertically tilting, so that bursting a cushion member of cushion rubber or the like is prevented also a load in a horizontal direction of a float can be transmitted straight efficiently to a fixed object and further swiveling the float can be more accurately prevented. CONSTITUTION:A bearing guide member 14 of guiding a bearing base 12 of a guide roller 11 is provided in a float. A pair of guide protrusions 24, 25 are horizontally provided in the bearing base 12, to provide in the bearing guide member 14 two sets of guide ribs 17a, 17b, 18a interposing from the upper/lower these guide protrusions 24, 25 guided to slide in a horizontal direction, and by locking displacement in a vertical direction and by guiding displacement in a horizontal direction, of the bearing base, only compression force acts in a cushion rubber 13, so as to prevent generating bending moment or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating body mooring device for mooring a floating body such as a pontoon (buoyancy chamber) or a floating bridge.

[0002]

2. Description of the Related Art For example, at the offshore oil storage base, various floating bodies are used for oil storage, wave prevention, oil prevention, and securing work scaffolds, etc., and most of them follow the change in water surface due to tide level or waves. It is moored to fixed objects such as piles to prevent drifting and shaking while allowing vertical movement.

Conventionally, as one means for performing such mooring, there has been a structure as shown in FIG. For example, a bearing base 5 is fixed to the outer surface of the buoyancy chamber 1 that constitutes the upper part of the oil barrier by way of two stages of mounting bases 2 and 3 and cushion rubber 4, and the fixing material 6 is fixed to the bearing base 5. The mooring roller 8 that is in contact with the vertical surface 7 is pivotally supported. In this structure, the load in the horizontal direction from the oil levee is buffered by the cushion rubber 4 and transmitted to the fixing material 6, and the mooring roller 8 rolls along the vertical surface 7 of the fixing material 6, so that the buoyancy is increased. The chamber 1 is allowed to move up and down while being prevented from shaking.

[0004]

However, in this conventional structure, as shown in FIG. 5, the degree of compression of the cushion rubber 4 is different above and below, so that the bearing base 5 tilts downward with respect to the horizontal line H--H. When a large horizontal force is applied to the bearing stand 5 in this state, a bending moment corresponding to the tilt angle θ acts on the bearing base 5 to bend (buckle) the cushion rubber 4, and the bending deformation causes further bending deformation. However, there is a problem that the cushion rubber 4 exceeds the allowable deformation limit and finally breaks as shown in FIG. Factors that cause the bearing stand 5 to tilt as shown in FIG. 5 include tilting of the bearing stand 5 and the mooring roller 8 due to its own weight, rocking of the buoyancy chamber 1 due to waves, and rocking due to a gap between the mooring roller 8 and the vertical surface 7. The change in the balance of the buoyancy chamber 1 due to the ballast water, the inclination of the fixed matter 6, and the increase in the deformation amount due to the repeated rotation of the mooring roller 8 can be cited.

Therefore, an object of the present invention is to improve the conventional structure of FIG. 5 and prevent the bearing base of the mooring roller from tilting up and down, thereby preventing breakage of cushion members such as cushion rubber. , The horizontal load of the float can be transmitted to the fixed object in a straight and efficient manner.
Moreover, it is an object of the present invention to provide a mooring device for a levitation body, which can more accurately prevent the sway of the levitation body.

[0006]

According to the present invention, in order to guide the vertical movement of a levitation body such as a pontoon while preventing the sway of the levitation body, the bearing base attached to the levitation body via a cushion member is used to fix the fixed matter. In a mooring device for a levitation body, in which a mooring roller that rolls along a vertical plane is pivotally supported, a bearing guide member is provided on the levitation body, and the bearing guide member restrains the vertical displacement of the bearing stand to prevent its horizontal movement. It is designed to guide the displacement of.

As one means for making the bearing stand and the bearing guide member have such a relationship, as shown in the example of FIG. 1, a pair of guide protrusions 24 and 25 are horizontally provided on the bearing stand 12, and the bearing guide member 14 is provided. The guide ribs 17a are two sets of guide ribs 17a that horizontally slide and guide the guide protrusions 24 and 25 from above and below.
・ Provide 17b, 18a and 18b. In this case, in order to prevent local wear of the guide ribs and ensure smooth sliding of the guide projections, the contact surfaces of the guide projections in contact with the guide ribs are preferably arcuate surfaces.

[0008]

With this structure, the bearing base of the mooring roller is restrained from being displaced in the vertical direction with respect to the levitation body, so that it does not tilt vertically. However, since it can be displaced in the horizontal direction (the direction in which the cushion member expands and contracts) and is guided by the bearing guide member, the load in the horizontal direction of the levitation body can be efficiently transmitted straight to the fixing material and the levitation body can be efficiently transferred. Can be accurately prevented.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a perspective view of a mooring device 10 according to an example of the present invention,
FIG. 2 is a front view with a part thereof omitted. In this mooring device 10, the bearing base 12 of the mooring roller 11 is attached to a levitation body (not shown) via the cushion rubber 13 and the mounting base 14 in the same manner as in the conventional example described above, but the following structure is added. Has been done.

That is, the bearing guide member 14 for guiding the bearing base 12 is provided, and the base plate 15 of the bearing guide member 14 is
The cushion rubber 13 is fixed to the front surface of the mounting base 14 together with the base plate 16. The bearing guide member 14 has the base plate 1
5 sets of upper and lower guide ribs 17a, 17 from the front of 5
b, 18a and 18b are horizontally projected. The upper and lower guide ribs 17a and 17b on the left side face each other in parallel to the left side of the cushion rubber 13, and the upper and lower guide ribs 1 on the right side.
8a and 18b are opposed to the cushion rubber 13 on the right side in parallel. Each of the guide ribs has a horizontal plate shape and is reinforced by a reinforcing rib 19 projecting from the front surface of the base plate 16 at a right angle thereto.

On the other hand, the bearing stand 12 has left and right bearing plates 21 and 22 projecting in parallel from the front surface of the base plate 20, and the mooring roller 11 is rotatable between the bearing plates 21 and 22 by a roller shaft 23. Is bearing on. In addition, the left and right bearing plates 21
A pair of left and right guide protrusions 24 and 25 are horizontally fixed to the front surface of the base plate 20 outside of 22. Each bearing plate 21
22 is reinforced from the outside by upper and lower reinforcing ribs 26 and 27 projecting from the base plate 20 on both upper and lower sides of the respective guide protrusions 24 and 25. Each of the guide protrusions 24 and 25 has an elliptical cross section. The elliptical cross section of the left guide protrusion 24 protrudes leftward from the left edge of the base plate 20 and is slidable back and forth between the upper and lower left guide ribs 17a and 17b. The elliptical cross section of 25 projects to the right from the right edge of the base plate 20 and is positioned so as to be slidable back and forth between the upper and lower right guide ribs 18a and 18b. The base plate 20 is fixed to the front surface of the front plate 28 of the cushion rubber 13.

Since the mooring device 10 has the above-mentioned structure, the left side guide projection 24 is constrained from being vertically displaced by the left and right upper and lower guide ribs 17a and 17b. Can be displaced. In addition, the right guide protrusion 25 also includes the right and lower guide ribs 18a.
The upper and lower displacements are constrained by 18b, but they can be displaced horizontally forward and backward along these.

Therefore, the bearing base 12 of the mooring roller 11 is
Two sets of left and right guide ribs 17a, 17b, 18a, 18b
By this, vertical displacement with respect to the mounting base 14 (floating body), that is, displacement in the bending and shearing directions is always restrained, and it is possible to make a straight horizontal displacement along these directions as shown by the chain line in FIG. Therefore, since only the compressive force acts on the cushion rubber 13 and no bending moment or the like acts on it, the bearing base does not tilt downward or upward to cause bending deformation of the cushion rubber 13 as in the conventional case.
Further, since the mooring roller 11 rolls along the vertical surface of the fixed object (not shown) while always maintaining the horizontal state, the rolling becomes smooth and the horizontal load from the floating body is fixed. Always communicate straight to objects.

FIG. 4 is a plan view showing an example of use of the mooring device 10. This example is a case where steel pipe piles (fixed matter) 30 are fixed at four places surrounding a plane cross-shaped levitation body 29 of a dike at an offshore oil storage base.
2 sets of mooring devices 10 are attached to the corners of the float 29, and the mooring rollers 11 of each mooring device 10 are
Each guide plate 3 provided at two places of each steel pipe pile 30
It is designed to roll along 1.

Although rubber is used as the cushion member in the above embodiment, an elastic material other than rubber may be used. Further, FIG. 4 shows only one usage example of the mooring device 10 according to the present invention, and various usage modes thereof are conceivable.

[0016]

As described above, according to the present invention, since the bearing base of the mooring roller can be displaced in the horizontal direction with respect to the floating body but is not displaced in the vertical direction, the cushion member is provided. Since only the compressive force acts on and the bending moment does not act, the bearing base does not tilt downward or upward to cause bending deformation of the cushion member, and the mooring roller is always in the horizontal state. Roll along the vertical plane of the fixed material while holding. Therefore, the cushion member can be prevented from breaking, and the mooring roller can be smoothly rolled, so that the horizontal load from the float can always be transmitted straight and efficiently to the fixed object.
The sway of the levitating body can be prevented more accurately.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a mooring device of the present invention.

FIG. 2 is a front view with a part of the mooring device omitted.

FIG. 3 is a vertical side view of the mooring device.

FIG. 4 is a plan view showing an example of use of the mooring device.

FIG. 5 is a side view of a conventional mooring device.

FIG. 6 is a side view showing that the cushion rubber breaks in the mooring device.

[Explanation of symbols]

 10 mooring device 11 mooring roller 12 bearing base 13 cushion rubber 14 bearing guide member 17a, 17b, 18a, 18b guide rib 24, 25 guide protrusion

Front page continuation (71) Applicant 000005278 Bridgestone Co., Ltd. 1-10-1 Kyobashi, Chuo-ku, Tokyo (71) Applicant 000106955 Shibata Industry Co., Ltd. 1058 Nakao, Uozumi-cho, Akashi-shi, Hyogo (71) Applicant 000140982 Shares Inter-company group 2-5-8 Kita-Aoyama, Minato-ku, Tokyo (72) Inventor Hachiro Miyaoka 2-3-2, Uchisaiwaicho, Chiyoda-ku, Tokyo Within Shirashima Petroleum Stockpiling Co., Ltd. (72) Shigeharu Kobe Kojimachi, Chiyoda-ku, Tokyo 6th-6th Cosmo Engineering Co., Ltd. (72) Inventor Koji Kuboyama 118 Futatsuka, Noda City, Chiba Prefecture Kawasaki Heavy Industries Ltd. 72) Inventor Nobuyasu Ikoma 1058 Nakao, Uozumi-cho, Akashi-shi, Hyogo Shibata Industry Co., Ltd. (72) Yoshihide Miyamoto 2-5-8 Kita-Aoyama, Minato-ku, Tokyo (72) Inventor Shiramizu Good north of Minato-ku, Tokyo 2-5-8 Aoyama Stock Company Inter-company group

Claims (3)

[Claims] 1. A floating body such as a pontoon or the like is rolled along a vertical plane of a fixed body on a bearing stand attached to the floating body via a cushion member in order to guide the vertical movement of the floating body. In a mooring device for a levitation body that rotatably supports a mooring roller, a bearing guide member for restraining vertical displacement of the bearing base with respect to the levitation body and guiding the horizontal displacement thereof is provided in the levitation body. Floating body mooring device. 2. A pair of guide protrusions are horizontally provided on the bearing base, and two pairs of guide ribs are provided on the bearing guide member for slidingly guiding the guide protrusions from above and below in the horizontal direction. The mooring device for a levitation body according to claim 1. 3. The mooring device for a levitation body according to claim 2, wherein the contact surface of the guide protrusion which is in contact with the guide rib is an arcuate surface.