JPS5985016A - Mooring device - Google Patents

Abstract

PURPOSE:To moor a mooring body efficiently by installing a ballast tank, which can float and sink, to a pillar interposed between a bit for mooring a floating body and the sea bottom. CONSTITUTION:A guide groove 8 is formed in the vertical direction of one end section of a floating-body tank while the bit 17 for mooring the floating body formed by a roller 10 slidably inserted into the guide groove 8 and a roller frame 11 is formed. The bit 17 is provided with a connecting means such as a chain 14 for mooring connected to a mooring post 7 while the pillar 12 fixedly holding the height of the bit 17 from the surface of the sea bottom is supported and interposed by a sea-bottom bearing 13 between the bit 17 and the sea bottom. the ballast tank 16, which can float and sink, is installed on its midway of the pillar 12. Accordingly, the roller 10 is followed up to rocking in the horizontal surface of the tank 1, and constantly stable mooring force can be displayed.

Description

[Detailed description of the invention] The present invention relates to a mooring device.

For example, when mooring a floating structure on water such as an offshore storage tank for petroleum, the amount of change in its draft is large, and the distance between the mooring hardware on the structure and the mooring pillar is due to the fact that several mooring structures are installed close to each other in parallel. For example, as shown in the side view of FIG. 1, the structure 01 rises and the position of the mooring hardware 010 on the structure is affected. is the mooring hardware 07 on the mooring column 03
If the mooring rope or mooring chain 014 connecting the two is located at a higher position, only the horizontal component of the tension of the mooring cable or mooring chain 014 acts for mooring, which is inefficient.
Furthermore, since the tension direction changes, the structure of the anchoring part becomes complicated, and in cases where it is necessary to maintain a constant distance between the structure 01 and the mooring column 03, the length of the mooring rope or chain 014 also changes depending on the draft. The maximum tension per mooring chain is between 150 tons and 20 tons.
In many cases, the size was as large as 0 tons, and there were many problems.

The present invention was proposed in view of the above circumstances, and aims to provide a mooring device for mooring a mooring body efficiently.
A floating body mooring bit is slidably inserted into the guide groove, a means for connecting the bit to a mooring column, etc. It is characterized by comprising a pillar interposed between the faces, and a ballast tank is provided on the pillar to enable it to float and sink.

An embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a plan view thereof, and FIG. 3 is a partially enlarged vertical sectional view taken along line m--■ in FIG.

In the above figure, 1 is an ark-shaped offshore tank as a floating body, which has a mooring column side recess 2 and a roller guide groove 8 at the end, and a mooring chain 14 between the recesses 2 and the guide groove 8. It has a notch 8' so that it can move up and down relatively. 4 is established on the seabed and has a fender (buffer material) 5' protruding from the side that restricts the movement of the tank in the short axis direction.
The main mooring column 3 is a fender (buffer) 5 established on the seabed and located at the end of the tank 1 to restrict movement in the short axis direction, and a fender (buffer) 5 to restrict movement to the right in the long axis direction. This is a mooring column with a fender (buffer material) 6 protruding from the side. 1° is a roller, 11 is a roller frame that rotatably holds the roller 10, and constitutes a floating body mooring bit 17. 12 is a pillar that is flexibly connected to the roller frame 11 via a flexible joint l-12'; 13 is a submarine bearing that is fixed to the seabed 15 and supports the lower end of the pillar 12 in a bowl-shaped recess so that it can swing freely; , 9 is a roller rolling wall in the roller recess, 14 is a notch 8
A mooring chain as means for connecting the roller frame 11 and the mooring post 3 via the cushioning material 7.

Reference numeral 16 designates a ballast tank installed in the middle of the pillar 12 in order to facilitate the installation work of the pillar 12 to the submarine bearing 13 or the removal work during repair. 12 can float and sink.

In such a device, when the tank 1 tries to move under the influence of wind and waves, the movement in the short axis direction is regulated by the fender 5' on the mooring column 4 and the fender 5 on the mooring column 3, and the movement in the long axis direction is regulated by the fender 5' on the mooring column 4 and the fender 5 on the mooring column 3. movement to the right is fender-6
The movement to the left in the longitudinal direction is regulated by the roller 10 being pressed against the roller transfer wall 9, and the regulating force is applied to the roller frame 11 and the mooring post 3 by the cushioning material 7.
It is supported by a mooring chain connected through.

When the draft of the tank 1 changes due to the ebb and flow of the tide or the state of cargo, the rolling friction generated between the roller 10 and the roller transfer wall 9 causes the roller 10 and the roller frame 11 attached thereto to change. The pillars 12 and others are also subjected to forces in the vertical direction, but at this time, the downward forces are countered by the bottom end of the pillars 12 being pressed against the seabed bearings 13, and the upward forces are counteracted by the own weight of the pillars 12. against
The roller 10 does not follow the vertical movement of the tank and always maintains a constant height.

Further, when the tank 1 swings horizontally within the range of elastic deformation of each fender, the roller 10 is moved by the pillar 12 that supports it. ! :Both are supported freely on the seabed bearing 13 and follow the movement of the tank.

According to such a device, the mooring force by the mooring chain 14 is transmitted to the tank via the roller 10, and when the tank moves up and down, the rolling friction generated between the roller 10 and the roller transfer wall 9 causes the mooring force to be transferred to the tank. 10 and the mooring chain 14 receive upward or downward force, but the upward force is regulated by the own weight of the pillar 12, and the downward force is regulated by the pillar 12 and the seabed bearing 13. The vertical movement of the tank due to this does not affect the posture of the buffer material and mooring chain, so stable mooring force can always be obtained.

Further, the roller frame 11 is connected to a pillar 12 via a flexible joint 12'.

Since the lower portion 41 of the pillar 12 is supported by the seabed bearing 13 so that it can swing freely, the roller 10 completely follows the swinging movement of the tank 1 in the horizontal plane.

It can always exert stable mooring force.

Furthermore, since the lower end of the pillar 12 is in contact with the seabed bearing 13 only under its own weight, it can be easily removed by draining the inside of the ballast tank 1G and lifting it upward using its buoyancy with a force equal to or greater than its own weight. It is easy to move the repair container.

In short, according to the present invention, a guide groove provided vertically on the end face of a floating body, a floating body mooring bit slidably inserted into the guide groove, and a means for connecting the bit to a mooring column or the like. , a pillar interposed between the bit and the seabed surface in order to maintain a constant height of the bit from the seabed surface.

The present invention is industrially extremely useful because a ballast tank is provided on the pillar to allow the pillar to float and sink, thereby providing a mooring device that efficiently moores the mooring body.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a known mooring device for an offshore petroleum storage tank, Fig. 2 is a plan view showing an embodiment of the present invention, and Fig. 3 is a partially enlarged longitudinal section taken along the line ■-■ in Fig. 2. It is a front view. 1: Tank floating body, 2: Recess for mooring bar, 3: Mooring pillar, 4
Mooring post, 5. Fender-15': Fender, 6: Fender, 7: Cushioning material, 8: Guide groove for roller, 8',
Notch, 9: Roller rolling wall, 10; Roller, 11: Roller frame, 12; Pillar, 12': Flexible join 1-i13: Seabed bearing, 14: Mooring chain (connection means), 15: Seabed, 16 :z<Last tank. 17: Mooring bit.

Claims (1)

[Claims] A guide groove provided vertically on the end face of the floating body, a floating body mooring pit slidably fitted into the guide groove, a means for connecting the bit to a mooring column etc., and a means for connecting the bit to a mooring column etc. A mooring device comprising a pillar interposed between the bit and the seabed to maintain a constant height, and a ballast tank provided on the pillar to allow the pillar to float and sink. .