JPH0649477B2 - Single point mooring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a one-point mooring device for mooring a floating body equipped with a floating oil production / storage / shipping system or the like on the ocean.

[Conventional technology]

FIG. 3 is an example of a conventional one-point mooring device, and shows an overall front view. In the figure, the buoy body 05 is locked to the seabed by a plurality of mooring lines 07, and the floating body 01 is moored via the yoke 03. Crude oil, gas, etc. produced on the seabed are collected in PLEM (Pipe Line End Manifold) 08 and sent to the buoy body 05 through the flexible riser system 06,
Further, it is sent to the floating body 01 through the pipeline in the yoke 03.

There is a turntable 04 on the buoy body 05, and the floating body 01 can rotate 360 degrees around the buoy body 05 in accordance with changes in directions such as wind, waves and tidal current. In addition, the yoke 03 and the floating body
The connecting portion of 01 is pin-coupled via a pin 02 so that an excessive bending load does not act on the yoke 03 and the rotary table 04 due to the relative motion of the floating body 01 and the buoy body 05 due to waves.

[Problems to be solved by the invention]

According to the conventional one-point mooring device as described above, the floating body does not have a detachment means and cannot evacuate due to the storm attack, so the installation area is limited or it withstands excessive loads and movements. The disadvantage is that a required design is required.

Also, because the pin structure of the connecting part of the floating body and the yoke is repeatedly slid, it is important to consider wear, and repair or replacement of parts when wear exceeds an allowable amount requires a large amount of work. It has the drawback of becoming a thing.

The present invention solves the above-mentioned drawbacks of the prior art and facilitates the evacuation of the floating body in an emergency.Furthermore, repairing of the connecting portion between the floating body and the yoke or maintenance / inspection such as parts replacement is possible. It is an object to provide an easy one-point mooring device.

[Means for solving problems]

For this reason, the one-point mooring device of the present invention includes a buoy body locked to the seabed via a mooring line, a rotary table rotatably installed in the horizontal plane above the buoy body, and one end of which is mounted on the rotary table. In a one-point mooring device including a yoke fixed to the other end and connected to a floating body to be moored, a fitting member having a horizontal cylindrical surface at a floating body side end portion of the yoke has an opening downward on a floating body side wall. It is characterized in that it is equipped with a detachable connecting mechanism that is fitted in the fitted member and that suspends the floating body side end portion of the yoke from above the fitted member so as to be able to move up and down.

[Action]

With the above configuration, the fitting member at the end of the yoke can be easily attached and detached from the fitted member on the ocean by feeding and unwinding the lifting device, and the floating body and the one-point mooring device can be attached and detached. Become. Further, since there is no pin connection, the allowable amount of wear is relatively large, and parts replacement is easy.

〔Example〕

1 and 2 show an embodiment of a one-point mooring device of the present invention. FIG. 1 is an overall front view thereof, and FIG. 2 is a detailed view of a connecting mechanism showing a connection between a buoy body and a floating body. Is shown. In the figure, reference numerals 1 and 3 to 8 of the present invention are conventional reference numerals.
The same members as 01, 03 to 08 are shown. That is, 1 is a floating body to be moored, 5 is a buoy body, 4 is a rotary table, 3 is a yoke connecting the buoy and the floating body, 7 is a mooring line for locking the buoy to the seabed, and 8 is crude oil produced on the seabed.・ PLEM, 6 that collects gas is a riser that raises crude oil and gas from the PLEM to the buoy itself.

In the present invention, the connecting mechanism between the yoke 3 and the floating body 1 is new, and its details are shown in FIG.

Reference numeral 9 denotes a U-shaped cross-section structure (fitted member) fixed to the bow or stern of the floating body 1 with the opening surface facing downward,
The inner surface is a rubber fender whose surface is coated with wear resistant material.
10 is installed. The surface of the rubber fender 10 is parallel to the inner surface of the U-shaped cross-section structure 9 depending on the mounting position.

A derrick 11 is provided on top of the U-shaped cross-section structure 9. Reference numeral 12 is a horizontal horizontal member (fitting member) provided at the end of the yoke 3 and having a cylindrical surface, and is raised and lowered by a suspending member including the derrick 11 and the suspending chain 13.

It should be noted that the rubber fenders are attached so that the cylindrical surface of the horizontal member 12 is in contact with each rubber fender 10 when the horizontal member 12 is lifted and fitted into the U-shaped cross-section structure 9 (state shown in the drawing). The position is fixed. By inserting the stopper 14 into the stopper link of the suspension chain 13 in this state, the tension acting on the suspension chain 13 can be prevented from being transmitted to the derrick 11. At the same time, the horizontal lateral member 12 is held in the U-shaped cross-section structure 9 such that the rotational displacement thereof is allowed but the displacement in the front-back direction and the upward / downward direction is restricted.

When detaching, the stopper 14 is pulled out, the derrick 11 is driven, the suspension chain 13 is lowered, and the horizontal lateral member 12 is pulled out from the inside of the U-shaped cross-section structure 9. 15 is a jumping hose for sending crude oil and gas sent from the buoy to the floating body 1.

〔The invention's effect〕

The one-point mooring device of the present invention as described above employs the connecting mechanism, whereby the connecting portion between the yoke and the floating body can be easily attached and detached, and the floating body can be evacuated in an emergency. The mooring of the floating body is also easy.

Further, the sliding surfaces of the fitting member and the fitted member have a larger tolerance against wear as compared with the conventional pin structure, and maintenance and inspection are relatively easy.

[Brief description of drawings]

1 and 2 show an embodiment of a one-point mooring device of the present invention. FIG. 1 is an overall front view and FIG. 2 is a detail of a connecting mechanism showing a connection between a buoy body and a floating body. The figure is shown. FIG. 3 is an example of a conventional one-point mooring device, and shows an overall front view. 1 ... Floating body, 3 ... Yoke, 4 ... Rotary table, 5 ...
... Buoy body, 7 ... Mooring line, 9,10 ... Fit member, 11,13 ... Suspension device, 12 ... Fit member.

Claims (1)

[Claims] 1. A buoy body locked to the seabed via a mooring line, a rotary table rotatably installed on an upper part of the buoy body in a horizontal plane, and one end fixed to the rotary table and the other end. In a one-point mooring device including a yoke or the like connected to a floating body to be moored, a fitting member having a cylindrical surface in a horizontal direction is provided at an end of the yoke on the floating body side, and a fitting member having a downward opening in a side wall of the floating body. A one-point mooring device, comprising a detachable connecting mechanism, which is attached to the floating body side end portion of the yoke and hangs the floating body side end portion of the yoke so as to be lifted and lowered from the fitted member.