JPS5816958Y2 - Support floating bodies in floating structures - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a supporting floating body provided on the lower surface of the structure body in a floating structure, particularly a large floating structure.

Floating structures installed on the sea surface, especially large floating structures, need to reduce the effects of tides and waves.

A large number of cylindrical support floats are installed on the underside of the structure body, so that only a portion of each support float is submerged in seawater, and the entire weight of the structure body and support floats is supported only by the buoyancy force acting on this portion. However, it is desirable to further reduce the effects of tidal currents and waves on supporting floating bodies. ○ The purpose of this invention is to provide a supporting floating body for floating structures that is less susceptible to the effects of tides and waves.

The support floating body according to this invention includes a vertically downward-facing columnar part attached to the structure body so as to be able to freely rotate about the axis, and a horizontal wing-type buoyancy tank fixed to the lower end of the columnar part. Part of the columnar part and the horizontal wing type buoyancy tank are submerged in seawater.

According to this invention, the buoyancy tank, which is submerged in seawater, is fixed to the lower end of the vertically downward columnar section, so by increasing the volume of the buoyancy tank sufficiently, the horizontal cross-sectional area of the columnar section can be reduced. As a result, the influence of currents and waves is reduced.

Furthermore, since the buoyancy tank fixed to the lower end of the columnar part is in the form of a horizontal wing, even if the buoyancy tank becomes larger, the height and depth of the buoyancy tank will not increase.

Therefore, without particularly increasing the overall height of the support floating body, the entire horizontal wing type buoyancy tank can be located at a depth where the influence of waves is small in seawater, and the influence of waves on the support floating body can be further reduced. .

In general, the columnar part is attached to the structure body so that it can rotate freely around its axis, so even if the direction of the tidal current changes, the horizontal wing type buoyancy tank will follow this and rotate, Resistance to current is always kept to a minimum.

Therefore, the influence of tidal currents on the support floating body is significantly reduced, and furthermore, a drive device for rotating the horizontal wing type buoyancy tank is not required.

Therefore, by appropriately arranging the support floating bodies according to this invention, the influence of tides and waves on the floating structure can be significantly reduced.

This specialized embodiment will be described below with reference to the drawings. FIG. 1 shows an example of a floating structure, in which a large number of supporting floating bodies 2 are mounted on the lower surface of a long and thin structure body 1 that is rectangular when viewed from the top. is provided.

As shown in FIG. 2, the support floating body 2 consists of a vertically downward columnar part 3 with a small horizontal cross-sectional area, and a horizontal wing type buoyancy tank 14 fixed to the lower end of the columnar part 3. As will be described later, it consists of a column mounting shaft 4 attached to the structure body 1, and a circular tank column 5 connected to the lower end of the column mounting shaft 4 with bolts and nuts, and the axis of the columnar part 3 is , coincides with the line of action of the buoyant force on the wing-shaped floating tank 14.

As shown in FIG. 3, the strut mounting shaft 4 has a large-diameter portion 4a that occupies most of it, a small-diameter portion 4b provided above the large-diameter portion 4a, and a large-diameter portion 4a and a small-diameter portion 4b. A bearing mounting part 4 having an outer diameter slightly larger than the small diameter part 4b is provided between the bearing mounting parts 4 and 4b.
c, and an annular stepped portion 4d is formed between the large diameter portion 4a and the bearing mounting portion 4c.

Further, a chain 6 for preventing the support floating body from falling is connected to the upper end of the small diameter portion 4b of the support column attachment shaft.

A radial bearing section 7 and a thrust bearing section 8 for attaching the supporting floating body 2 are provided on the lower surface of the structure body 1.

The radial bearing portion T is provided with a mutually concentric hole 7a and a bearing mounting portion 7b that extend vertically through the radial bearing portion T.

The hole 7 has an inner diameter slightly larger than the large diameter portion 4a of the pillar mounting shaft, and the bearing mounting portion 7b is provided continuously and above the hole 7a, and has an inner diameter larger than the hole 7a. An annular stepped portion 7c is formed between the bearing mounting portion 7b and the bearing mounting portion 7b.

The thrust bearing part 8 is removably attached to the upper surface of the radial bearing part 7, and passes through this in the vertical direction.
A bearing mounting portion 8a and a hole 8b are provided concentrically with the hole 7a of the radial bearing portion 7.

The bearing mounting part 8a is the bearing mounting part 7b of the radial bearing part 7.
The hole 8b is provided continuously and above the bearing mounting part 8a, and has an inner diameter that is smaller than the bearing mounting part 8a and slightly larger than the outer diameter of the column mounting shaft small diameter part 4b. An annular stepped portion 8c is formed between the bearing mounting portion 8a and the hole 8b.

The support column mounting shaft 4 of the support floating body columnar part 3 is inserted into the hole 7a of the radial bearing part 7 from below, and installed so that a part of the small diameter part 4b at the upper end protrudes above the hole 8b of the thrust bearing part 8. It is being

A thrust self-aligning roller bearing 9 is installed between the annular stepped portion 4d and bearing mounting portion 4c of the strut mounting shaft 4 and the annular stepped portion 8c and bearing mounting portion 8a of the thrust bearing portion 8. Two tapered roller bearings 11 are mounted between the large-diameter portion 4a of No. 4, the annular stepped portion 7c of the radial bearing portion 7, and the bearing mounting portion 7b with a spacer 10 in between.

The hole 7a of the radial bearing part 7 and the large diameter part 4 of the column mounting shaft 4
An oil seal 12 is provided between the bearing 9 and the bearing 9.
, 11, 11 are always filled with lubricating oil.

As is clear from FIG. 3, the strut mounting shaft 4 can be pulled out from the bearing parts 7, 8 by pulling it downward.

The tip of the chain 6 is connected to the structure body 1 in order to prevent the column attachment shaft 4, that is, the support floating body 2, from falling.

The floating structure is floated on the sea surface so that the structure body 1 is almost horizontal, and is moored to a dolphin (as shown), etc., and only a part of the tank support 5 and the horizontal wing type buoyancy tank 14 are floating in the sea water. The entire weight of the structure body 1 and supporting floating body 2 is supported only by the buoyant force acting on this part.

Therefore, a predetermined distance is maintained between the lower surface of the structure body 1 and the sea surface.

At this time, the buoyant force acting on the supporting floating body 2 is received by the thrust self-aligning roller bearing 9.

The entire horizontal wing type thick tank 14 is located at a depth where the influence of waves in the seawater is small, and waves and tidal currents near the sea surface are mainly received by the columnar part 3 with a small horizontal cross-sectional area, and further downward tidal currents are received. It is mainly received by the wing-shaped floating tank 14.

When the direction of the tidal current changes, the supporting floating body 2 rotates to follow it, and the leading edge 14a of the wing-shaped floating tank 14 always stops at a position facing above the tide. Therefore, the wing-shaped floating tank 14
resistance to the current is always kept to a minimum.

According to this embodiment, since the columnar portion 3 is divided into a tank support 5 and a support support shaft 4, and these are connected by bolts and nuts, the airfoil floating tank 14 can be easily replaced.

Since the column attachment shaft 4 is inserted from below, it can be easily removed.

In addition, since the radial bearing section 7 and the thrust bearing section 8 are attached to the structure body 1, even in the event of damage etc.
Easy to replace.

However, the structure of the columnar part is not limited to that of this embodiment.
The method of attachment to the structure body 1 is also not limited to that of this embodiment.

The floating structure may have only the supporting floating body 2 according to this invention as in this embodiment, or it may have the supporting floating body 2 according to this invention and other supporting floating bodies.

For example, the structure body 1 is strongly affected by tides and waves.
The supporting floating body 2 according to this invention may be provided at the peripheral edge, and a cylindrical supporting floating body may be fixed to an inner portion that is not strongly affected by these influences.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, in which Fig. 1 is a perspective view of the entire floating structure, Fig. 2 is a perspective view of the supporting floating structure,
FIG. 3 is an enlarged vertical sectional view of the mounting portion of the support floating body. 1... Structure main body, 2... Support floating body,
3...Columnar part, 14...Horizontal wing type buoyancy tank.

Claims (1)

[Scope of utility model registration request] A plurality of supporting floats are provided on the lower surface of the structure body 1, and only a portion of each support float is submerged in seawater, and the entire weight of the structure body 1 and the support floats is supported only by the buoyancy force acting on this portion. In the floating structure, a vertically downward-facing columnar part 3 is attached to the structure main body 1 so as to be able to freely rotate around an axial center, and a horizontal airfoil type is fixed to the lower end of the columnar part 3. The supporting floating body is provided with a buoyancy tank 14, and a part of the columnar part 3 and the horizontal wing type buoyancy tank 14 are submerged in seawater.