JPS6023517A - Ship for improving seabed ground - Google Patents

Abstract

PURPOSE:To raise the workability and safety of a ship for improving the seabed ground by lowering the gravity center of the ship by a method in which the same shape of a frame is rotatably supported on the inside of the hull of a ?-shaped planar form, and a seabed ground improver is movably provided to the inside of the frame. CONSTITUTION:The same shape of a frame 2 is rotatably supported on the inside of a hull 1 of a ?-shaped planar form, and a movable girder 16 is provided to the inside of the frame 2. The girder 16 is attached with a drain sheet sender 23 and a drain sheet guider member 24. The girder 16 is lowered along the frame 2 vertically erected, the guider 24 is pushed into the seabed ground, the drain sheet 26 is guided to a given depth, and while sending out the drain sheet 26, the girder 16 and the guider member 24 are raised. One cycle of the operation is ended by leaving the drain sheet 26 and anchors 28 under the ground, and the operations are repeated. The safety and workability of the construction work can thus be raised.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a seabed soil improvement ship, and in particular, to the construction of a submarine soil improvement ship, in which a drain sheet made of inner paper of a water-containing soft layer such as a sludge deposit layer is laid, and an e.f. - Concerning the structure of a drain-type submarine soil improvement vessel.

As a method for improving seabed soil, a method has been adopted in which Lp moisture is sucked out by laying sand piles or drain sheets in the soft layer. The method of providing sand piles is called the sand drain method, and the method of using a drain sheet is called the paper drain method.

Conventional paper drain type submarine terracing vessels have a tower installed on the hull, similar to sand drain ships and deep-sea mixing processing ships, and use the tower to install long sheets to guide the drain sheet. The work was carried out by lowering guide members (pipes, etc.) from the ship to the seabed and pushing them further into the geological formations.

Therefore, the guide member must be long enough to cover the depth of the water, and the tower installed on the hull must also be high enough to allow the long guide member to be raised and lowered. Therefore, the length of the pipe used as the guide member must be This has the disadvantage of being prone to buckling if the ship has an excessively high center of gravity, and the ship's center of gravity is high and the wind pressure area is large, causing the ship to tilt and sway due to the effects of crosswinds and waves. There was a problem with sexuality.

The purpose of the present invention is to solve the problems of the prior art,
Submarine ground that can reduce the length of the guide member of the drain sheet, lower the center of gravity of the ship during work, and reduce vibrations caused by waves and wind, thereby improving workability and safety. The aim is to provide improved ships.

The present invention is characterized by rotatably supporting a planar-shaped frame inside the planar-shaped hull, and movably mounting a seabed soil improvement device inside the frame. By achieving the above objectives.

That is, according to the present invention, a planar road-shaped frame is supported rotatably about a horizontal axis 9 inside a planar road-mouth-shaped hull, and a frame is provided inside the frame in the longitudinal direction. Attach a movable girder and attach the fin/girder to the girder.
A sheet unwinding device and a guide member for guiding the drain sheet are installed, and during work, the frame is stood in water in a substantially vertical position, the girder is lowered along the frame, and the guide member is pushed into Kaien soil. Provided is a seabed soil improvement ship configured to guide the drain sheet into the seabed soil, then raise the girder while unwinding the drain sheet, and thereby lay the drain sheet into the seabed soil. .

In such a configuration, the frame is rotatably supported by a hinge whose position is adjustable by a hydraulic cylinder, and the force acting on the frame and the guide member due to ship body motion is alleviated. is preferred.

Hereinafter, the present invention will be explained in detail with reference to FIGS. 1 to 6.

In FIG. 1, the hull l is formed of a buoyant body in the shape of a road mouth in plan with box-shaped structures on its four sides, and inside the hull, a frame 2 in the shape of a road mouth in plan is rotated around the horizontal axis. It is rotatably supported.

This frame 2, as shown in FIGS. 1 and 2,
Bearings 4 whose vertical positions can be adjusted along guide towers 3 provided on the left and right sides of the hull l, and pins 5 provided on both sides of the frame.
It is pivotably supported and rotatably supported relative to the hull. The bearing 4 is fitted into a vertical m6 formed on the inner surface of the guide tower 3 so as to be able to move up and down, and is held at a predetermined position by a fluid pressure cylinder 7 such as a hydraulic cylinder. Fig. 1 shows the frame 2 standing in the water in an almost vertical position, but when the ship is moving or stopping work (at anchor, etc.), the frame 2 is shown in an almost horizontal position. It is stored inside the hull of the ship.

As shown in Figure W11, the frame 2 is supported by a hinge consisting of the bearing 4 and the pin 5 at a position close to the end (upper end), and when the frame 2 is stood vertically as shown in the figure, the other end (lower end) ) is installed so that it is submerged in water near the sea bed.

A lifting tower 8 is provided on the hull 1 at a position facing the guide tower 3, a winch 9 is installed on the lifting tower, and the winch lifts the sheep 11.
A lifting rope 10 that is wound in and unwound through the frame 2 is connected to an eye 12 provided near the lower end of the frame 2. Therefore, when operating the winch 9, the frame 2 is moved from the horizontal position to the vertical position f! It can be rotated approximately 90 degrees up to c.

A mooring winch 13 is provided at the four corners of the hull 1, and the hull 1 is moored in a predetermined water area by means of a mooring rope 14 unwound from the winch and an anchor 15 connected to its tip.

A girder 16 is mounted inside the frame and is movable along its length. This girder is frame 2
It moves up and down along the frame 2 by a drive device consisting of a winch 17 installed at the upper end and a rope 20 stretched through the winch and sheaves 18, 19 and connected at both ends to the girder.

The girder 16 has a structure in which an upper watertight box-shaped section 21 and a lower section 22 are adjacent to each other.
Inside, there are multiple pieces (usually 8 pieces) arranged at predetermined intervals in the horizontal direction.
A seabed soil improvement device consisting of (~12 pieces) drain sheet unwinding devices [23] such as drain sheets is installed.In addition, in the lower compartment 22, each drain sheet unwinding device A plurality of elongated guide members 24 are provided that correspond to the housing [23 and are fixed through the partitions.The guide members 24 pass through the members forming the lower side of the frame 2. A plurality of guide holes 25 are formed for this purpose.

This guide member 24 is for guiding the drain sheet (Ba-f-) 26 (see FIG. 3) unwound from the drain sheet unwinding device 23, and as shown in FIG.
It is composed of a mother rib-like member having a 6-page through hole 27 for guiding the drain sheet. Further, the lower end of the drain sheet 26 protruding from the lower end of the guide member 24 is made of plastic, for example.
An anchor 28 made of a disc or the like is attached.

As shown in FIG. 6, a knife 30 for cutting the drain sheet 26 laid on the seabed 29 is provided at a position corresponding to each guide hole 25 on the lower end surface of the frame 2. As shown in FIG.

The operation of the submarine soil improvement vessel explained above is as follows.

While raising the girder 16, the winch 9 is used to reel in the lifting rope 0 and the frame 2 is stored horizontally on the hull L, the ship is moved to the working area, and the mooring winch 13 is operated to remove the mooring rope. 14 and anchor 15 to the hull l″f!: f!: Mooring guide member 24
The anchor 24 is attached to the guiding member 24 by reversing the drain sheet (the anchor 28 is attached to the tip of the paper belt 26 and the drain sheet unwinding device RC(-"-')-ru) 23 that has penetrated through the inside and is unwound. Tip (bottom end).

Next, the lifting winch 9t is operated to unwind the lifting 10, the frame 2 is rotated, and the hinge 4.
5 in a substantially perpendicular plane that includes the axis. Following this, the hydraulic cylinder 7 is operated to bring the lower end of the frame 2 as close as possible to the seabed 29. This state is shown in FIG.

Next, the winch 17 is operated to lower the girder 16 and the guide member 24 fixed thereto, and by pushing the guide member into the seabed soil, the sidren sheet 26 is guided into the seabed soil. The winch 17 is activated when pushed in to the specified depth.
' (see Figure 85).

Next, while releasing the reel 23 and unwinding the drain sheet 26, the winch 17 is operated in the opposite direction to raise the girder 16 and the guide section I ((pipe) 24, and remove the drain sheet ((-・e-) 26). The anchor 28 is left in the seabed soil.

When the lower end of the guide member 24 passes through the lower end surface of the frame 2 or the knife 3o provided therein, this knife is activated to reach the drain sheet 26 by 9JL.

This completes one cycle of work.

After completing the above cycle, rotate frame 2 and complete the hull! Lift the drain sheet 26 upward, attach another anchor 28 to the tip of the drain sheet 26, operate each mooring winch 13, readjust the amount of winding in and unwinding of each mooring glove 14, and move the hull 1 a predetermined distance. After moving, the above procedure is repeated again to lay the Tetrane sheet 26 into the seabed soil.

If you are unable to cover the working area simply by readjusting the Moorinda Row 7" 14, you can replace the anchor 15 with an anchor port and move the hull 1 in the same view.
Move the mooring.

According to the embodiment described above, an enclosed frame is used which rotates with respect to the hull l and is submerged in the water in a substantially vertical position, and the drain sheet unwinding device 23 and the f-tube guide member 24 are connected to the frame. Since it is equipped with a seabed soil improvement device consisting of
The guide member 24 can be lowered and pushed in from a position close to the seabed 29, and compared to the prior art, the guide member 24 can be shortened by a length close to the depth of the seabed. Therefore, the bending (buckling) strength of the guide member can be greatly improved for the same cross section, and the guide member can be prevented from bending or breaking, thereby improving work efficiency.

In addition, the tower installed on conventional ships can be removed, and the frame 2 is submerged below the sea surface during work, which lowers the ship's center of gravity and reduces the sway of the P1 ship, which has a small wind pressure area. be able to.

Furthermore, since the length of the guide member 24 can be reduced and a tower (high) as in the conventional case is not required, weight reduction can also be achieved.

Furthermore, since the rotary frame 2 is supported by the fluid pressure cylinder 7, the movement of the hull l is prevented by the elongated guide member 24.
This can prevent the guide member from being bent or damaged.

In addition, in the above embodiment, the case where one frame 2 is attached to the hull 1 has been explained, but it is also possible to provide two or more frames. By alternately using soil improvement devices, work efficiency can be improved.

Further, in the illustrated embodiment, the frame 2 is held by a fluid pressure cylinder 7 such as a hydraulic cylinder to alleviate the force applied to the guide member 24 when the ship is rocking. If an accumulator is connected to the cylinder 7 through the nozzle, this force can be alleviated even more effectively.

As is clear from the above description, according to the present invention, by shortening the guide member for pushing the drain sheet, bending of the guide member can be prevented, thereby improving workability. In addition, by lowering the center of gravity of the ship, there is less shaking and safety and workability are improved, resulting in a self-contained submarine soil improvement ship.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the S-soil improvement ship according to the present invention when the frame is in a vertical position, and Fig. 2 is a perspective view of the S-soil improvement ship according to the present invention.
-H is a partial sectional view, Figure 3 is a partial perspective view showing the drain sheet unwinding device, drain sheet, guide member, etc. in the ITI diagram, and Figure 4 is a partial perspective view showing the drain sheet unwinding device, drain sheet, guide member, etc. in the ITI diagram. A schematic explanatory diagram showing the upright state, Figure 5 is the 4th
A schematic explanatory diagram showing a state in which the holder and guide member have been lowered and pushed into the seabed soil from the state shown in the figure. Figure 6 is a partial schematic explanatory diagram showing a knife for cutting the drain sheet provided at the lower end of the frame. be. 1... Hull, 2... Frame, 4... Bearing, 5...
... Bottle, 7... Fluid pressure cylinder, 9... Winch, lo... Lifting quad, 13... Moorinda winch, 16... Girder, 17... Winch,
20... Rope, 23... Drain sheet unwinding device (-e-bar')-ru), 24... Guide member, 26...
...Drain sheet (paper), 28...Anchor (
drain sheet], 29...bottom of the ocean, 30...knife. Figure 2 Figure 4 @ Figure 6 Figure 5

Claims (2)

[Claims] (1) A frame with a generally square shape in plan view is supported rotatably around a horizontal axis inside a hull with a roughly square shape in plan view, and is movable in the length direction inside the frame. A girder is covered with iron, a drain sheet unwinding device and a guide member for guiding the drain sheet are attached to the girder, and during work, the frame is erected in water in an almost vertical position, and the girder is lowered along the frame. The guide member is pushed into the seabed soil to guide the drain sheet into the seabed soil, and then the girder is raised while unwinding the drain sheet, thereby pushing the drain sheet into the seabed soil. A seabed soil improvement vessel configured to install cables. (2) The submarine soil improvement ship according to claim 1, wherein the frame is supported so as to be rotatable nine times by a hinge that is held by a hydraulic cylinder so that its position can be adjusted.