JPS6027118Y2 - Tension mooring type floating platform mooring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for mooring a tension mooring type floating platform used in oil production and the like.

To produce oil from the seabed in relatively deep oceans, a tension-moored floating platform as shown in Figure 1 is sometimes used.

This tension mooring type floating platform 1 is composed of several columns 3 that are connected to each other by a horizontal place 2 and provide buoyancy, and a deck 4 placed on the columns 3. A sinker 6 is fixed to the seabed directly below the floating platform 1 by extending several mooring members 5, such as every fourth wire or connecting pipe, vertically downward.
The mooring member 5 is always attached to the anchor mandrel 8 placed in the
The floating platform 1 is moored by being connected so that tension is applied to the floating platform 1.

Conventional mooring device 10 on this floating platform
As shown in Figs. 1 to 5, the sinker 6 has a sinker 6 fixed to the seabed and a pseudo-bead-shaped head placed on the bottom of a cylindrical recess provided in the sinker 6. anchor mandrel 8 and located above this anchor mandrel 8,
A cylindrical body having an appropriate number of disc-shaped latch segments 14 having an appropriate number of legs 12, for example four, and an inner circumferential surface that is in contact with the outer periphery of the anchor mandrel 8 and the outer periphery of the latch segment 14, and the mooring member 5 is connected to the upper end surface. The sleeve 16 is made up of a sleeve 16.

The legs 12 include a latch segment main body 14A and an auxiliary member 14.
Although the legs 12 are mounted sandwiched between the legs 12 and the legs 12, a slight gap is formed above and below the legs 12, which allows the legs 12 to swing in the radial direction.

Further, a claw 12A that projects inward is formed at the tip of the leg 12, and the claw 12A has a shape that can be engaged with a constriction 8B formed on the outer periphery of the anchor mandrel 8.

The inner peripheral surface of the sleeve 16 is formed with a recess 16A that is aligned with the outer surface of the leg 12 and is large enough to allow the claw 12A to slide into the constriction 8B along the outer peripheral surface of the head 8A of the anchor mandrel 8. .

Furthermore, the reference numeral 17 is a bolt for connecting the latch segment main body 14A and the auxiliary member 14B, and the reference numeral 18 is a seabed.

As shown in FIGS. 2 to 5, this conventional mooring device 10 includes a mooring member 5 connected to a tension adjustment mechanism (not shown) installed in a platform 1 floating on the sea. By sending the sleeve 16 downward, the sleeve 16 descends under its own weight, and as shown in FIG. 3, the legs 12 of the latch segment 14 slip into the gap formed on the outer periphery of the head 8A of the anchor mandrel, and as shown in FIG. As shown, the claw 12A engages with the constricted portion 8B.

Next, when the mooring member 5 is pulled by the tension adjustment mechanism, the sleeve 16 and the anchor mandrel 8 are engaged in the vertical direction via the claws 12A formed at the leg tips of the latch segments, as shown in FIG. Fit.

By locking the tension adjustment mechanism while applying tension to the mooring member 5, the mooring member 5 is reliably connected to the anchor mandrel 8.

Since tension is always acting on the mooring member 5, the leg claw 12A of the latch segment 14 and the anchor mandrel constriction 8
The engagement with B will not disengage, and the floating platform 1 will be reliably moored at a fixed position.

However, once this conventional mooring device is connected, it cannot be disconnected again, making it inconvenient to replace, inspect, repair, etc. parts such as the latch segment mooring member.

The present invention was made in view of the drawbacks of the above-mentioned conventional technology.
It is an object of the present invention to provide a mooring device for a floating platform that has a simple structure and can be easily disconnected.

The tension mooring type floating platform mooring device according to the present invention includes an anchor mandrel whose bottom is fixed to the seabed and a groove is provided around the outer periphery, and which is positioned on the anchor mandrel and engaged with the groove to anchor the A latch segment provided with radially swingable legs for clamping the mandrel and a gap that is in sliding contact with the outer periphery of the anchor mandrel and the outer periphery of the latch segment, and for the legs to slide into the groove portion, is provided between the anchor mandrel and the anchor mandrel. a sleeve having an inner circumferential surface formed therein, and having an inner circumferential surface that abuts the outer surface of the leg and locks the leg, and is connected to a mooring member that extends upward to the sea;
In the tension mooring type floating platform mooring device, a recess having a radially outward and downwardly inclined surface is provided on the outer circumferential surface above the legs of the latch segment, and the latch segment is provided with a recess having a radially outward and downwardly sloping surface. A concave groove is provided on the inner peripheral surface of the sleeve above the concave portion for accommodating the dog piece, and the dog piece that has slipped into the concave groove due to the lowering of the sleeve is removed from the concave groove. A portion of the latch segment is supported in a state of protruding into a recessed portion of the latch segment, and the sleeve and the latch segment are vertically connected via a dog piece when the sleeve rises. This configuration provides a distant relative of the above objectives.

According to the invention, from the state where the connected sleeve of the mooring member is connected to the anchor mandrel via the legs of the latch segment, the sleeve is lowered to a position where the concave groove of the sleeve and the recess of the latch segment are aligned. and,
The dog piece slides down along the slope of the recess and is supported by the concave groove of the sleeve with a part of it protruding into the latch segment recess.If the sleeve is raised in this state, the dog piece slides down through the dog piece. As the sleeve and the latch segment are connected, a gap is formed on the outer periphery of the anchor mandrel for the leg to slide into, so that the clamp of the anchor mandrel by the leg is released and the latch segment rises together with the sleeve. This releases the connection between the sleeve and the anchor mandrel.

Next, an embodiment of a mooring device for a floating platform according to the present invention will be described based on the drawings.

6 to 9, the floating platform mooring device 19 according to the present invention is similar to the conventional mooring device 10,
A sinker 6 fixed to the seabed by a pile or its own weight, an anchor mandrel 8 placed on the sinker 6, a latch segment 14 located on the anchor mandrel 8 and provided with legs 12, and an anchor mandrel 8. and a sleeve 16 having an inner peripheral surface in contact with the outer periphery of the latch segment and to which the anchoring member 5 is connected.

The outer periphery of the latch segment 14 rises upward, and a radially outward downwardly inclined surface 2
Recesses 20 having a diameter of 0A are provided at appropriate locations on the outer periphery, for example, at four equal locations on the outer periphery, and a dog piece 22 is housed in each of the recesses 20 .

On the other hand, the upper part of the inner periphery of the sleeve 16 is aligned with the recess 20 provided on the outer periphery of the latch segment 14, and has a horizontal surface 24A.
A groove 24 having a triangular cross section is provided around the circumference.

This groove 24 formed above the inner circumference of the sleeve 16
As shown in the figure, when the sleeve 16 is connected to the anchor mandrel 8, that is, when the sleeve 16 is lowered to engage the pawl 12A of the leg 12 of the latch segment 14 with the anchor mandrel waist 8B, a recess is formed. The dog piece 22 is provided at a position such that it does not slip into the groove 24 from the dog piece 20 .

Next, the operation of the mooring device 19 according to the present invention will be explained.

The connection between the sleeve 16 and the anchor mandrel 8 via the latch segment 14 is performed in the same manner as in the conventional mooring device 10, and the connected state is shown in FIG. 6, and its explanation will be omitted. .

To release the connected state as shown in FIG.
falls due to its own weight.

The sleeve 16 is lowered to a position where the groove 24 on the inner circumference of the sleeve aligns with the recess 20 on the outer circumference of the latch segment 14.

Then, as shown in FIG. 7, the dog piece 22 housed in the recess 20 slides down along the inclined surface 20A and fits into the groove 24 provided on the inner peripheral surface of the sleeve 16.

Next, when the tension adjustment mechanism is operated to pull up the mooring member 5 and raise the sleeve 16, as shown in FIG. However, since the dog piece 22 protrudes inward from the inner peripheral surface of the sleeve 16, the upper end surface of the dog piece 22 comes into contact with the upper surface of the recess 20 provided on the outer periphery of the latch segment 14.

On the other hand, a gap is formed in the outer periphery of the pseudo-bead-shaped head 8A of the anchor mandrel 8, and the legs 12 are attached to the latch segment 14 so as to be swingable in the vertical direction, so that the latch segment 14 rises together with the sleeve 16. As the leg 12 rotates around the leg base 12C in the direction of the arrow in FIG. The connection between the mandrel 8 and the sleeve 16 is released.

In the above embodiment, the recesses 20 are provided at appropriate locations on the outer periphery of the latch segment 14, for example, at four equal locations on the outer periphery, but the recesses may be provided all around the outer periphery. .

At this time, in order to prevent the dog pieces 22 from being unevenly distributed, it is desirable to store a large number of dog pieces 22 in this recess, and to minimize the distance between adjacent dog pieces.

As is clear from the above description, the present invention provides a platform mooring device with a very simple structure.

In addition, the connection between the sleeve and the anchor mandrel can be released simply by lowering the sleeve to which the mooring member is connected to a predetermined position and then raising it. As a result, parts such as latch segments and mooring members can be replaced, Convenient for inspection, repair, etc.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a floating platform in a moored state, and Figures 2 to 5 are longitudinal sectional views of a conventional mooring device for a floating platform, showing the state in which the mooring member is connected to the seabed. FIGS. 6 to 8 are longitudinal sectional views of the mooring device according to the present invention, showing a state in which the mooring member is disconnected, and FIG. 9 is a state diagram in which the mooring member is connected to the seabed. FIG. 4... Mooring member, 8... Anchor mandrel, 12... Leg, 14... Latch segment, 16... Sleeve, 16A. ...
...Recess formed on the inner circumference of the sleeve, 19...
...Floating platform mooring device according to the present invention, 2
0... Recess for storing the dog piece, 24... Groove for engaging the dog piece formed on the inner periphery of the sleeve.

Claims (1)

[Scope of utility model registration request] An anchor mandrel whose bottom part is fixed to the seabed and a groove is provided around the outer periphery, and radially swingable legs that are located on the anchor mandrel and engage with the groove to clamp the anchor mandrel. The latch segment is in sliding contact with the outer periphery of the anchor mandrel and the latch segment, and forms a gap between the latch segment and the anchor mandrel for the leg to slide into the groove, and is in contact with the outer surface of the leg to engage the leg. In the mooring device for a tension mooring type floating platform, the sleeve has an inner circumferential surface to stop the latch segment, and a sleeve to which a mooring member is connected and extends upward into the sea. A recessed portion having an outwardly downwardly inclined surface is provided, and a dog piece capable of sliding down along the sloped surface is accommodated in the recessed portion; and the dog piece is accommodated on an inner circumferential surface of the sleeve above the recessed portion. A concave groove is provided to support the dog piece that has slipped into the concave groove due to the lowering of the sleeve, with a portion of the dog piece protruding into the recess of the latch segment. 1. A mooring device for a floating platform, characterized in that the mooring device is configured to vertically connect the segments to each other via a dog piece.