JPH0958577A - Sand pile driving barge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a water height during shifting, to increase an improving depth, and desides, to ensure stability of work. SOLUTION: A sand pile driving barge comprises a pulley 8 supported on the upper part of an outer cylinder 5 and the lower part of an inner cylinder 6 between a leader having the vertical axis outer cylinder 5, supported on one side part of a pontoon, and an inner cylinder 6 elevatably inserted in the outer cylinder 5 between the outer and inner cylinders 5 and 6; a winch 10 mounted on the pontoon or the outer cylinder 5; an expansion drive device 11 having a wire 9 to lift the inner cylinder 6 having one end wound around the which 10; and a washer 12 protruded and retracted from a position below the inner cylinder 6 lifted to a level higher than a given height.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand pile driving ship in which compacted sand piles (sand compaction piles) are placed on the bottom of the water.
The present invention relates to a sand pile driving ship capable of increasing the improvement depth and ensuring work stability.

[0002]

2. Description of the Related Art As one of the seabed ground improvement methods associated with the construction of offshore artificial islands and the expansion of various port facilities, there is a method of driving compacted sand piles on the seabed (sand compaction pile method). In this construction method, a columnar leader erected on a pontoon, a cylindrical casing that is suspended in water by using the leader as a guide, a vibro hammer connected to the upper end of the casing, and a casing and a vibro hammer are moved up and down. A sand pile driving ship including a winch and a sand supply device for supplying sand into the casing is used.

In this sand pile driving ship, it is necessary that the upper end of the casing be located on the water surface when the casing is penetrated to a predetermined depth, and that the casing should be pulled up to the sea during rounding. is there. Therefore, the leader is formed higher than the height of the casing and the vibro hammer.

[0004]

[Problems to be Solved by the Invention] As the sand compaction pile method is gradually applied to the offshore, and when the improved depth becomes large, the height of the casing becomes higher and the height of the leader above the water becomes higher. For this reason,
It may not be possible to navigate under a road or bridge constructed at sea during a round trip, and it may be necessary to select a largely bypassed route to move to the target position, or it may not be possible to call at a port beyond the bridge.

In view of the above circumstances, the present invention makes it possible to reduce the height above the water at the time of rounding, increase the improved depth, and ensure the stability of the work. It is intended to provide.

[0006]

In order to achieve the above-mentioned object, a sand pile driving ship according to the present invention has an outer cylinder of a vertical axis supported on one side of a pontoon, and an elevating and lowering shell for the outer cylinder. A leader having an inner cylinder that can be inserted; and a pulley supported between the inner cylinder and the outer cylinder on the upper part of the outer cylinder or on the upper part of the outer cylinder and the lower part of the inner cylinder, and the winch mounted on the ship or outer cylinder. And a wire for lifting the inner cylinder whose one end is wound around the winch.

[0007]

In the present invention, the shape of the outer cylinder and the inner cylinder of the reader is not particularly limited, but it is necessary to form a gap between the outer cylinder and the inner cylinder that is large enough to arrange a pulley. Is.

The extension drive device of the present invention comprises a pulley supported between the inner and outer cylinders on the upper part of the outer cylinder or on the upper part of the outer cylinder and the lower part of the inner cylinder, and a winch mounted on the ship or the outer cylinder. The inner cylinder having one end wound around the winch has a wire for hoisting the wire, and the wire is wound around the winch to hoist the inner cylinder against its own weight.

By arranging the pulley and the wire between the inner and outer cylinders in this manner, it is possible to prevent the wires from vibrating between the upper and lower pulleys and colliding with each other, and at the same time, passing through the inner cylinder. It becomes easier to get on and off the scaffolding, and workability can be improved.

The above pulley requires a pulley to be supported at least on the upper part of the outer cylinder when the tip of the wire is fixed to the inner cylinder side, and when the tip of the wire is fixed to the outer cylinder side. Requires a pulley supported on the upper part of the outer cylinder and a pulley supported on the lower part of the inner cylinder. In practice, in order to reduce the tension acting on the wire, a wire having multiple pulleys supported on the upper part of the outer cylinder and the lower part of the inner cylinder and having one end connected to the upper part of the outer cylinder or the lower part of the inner cylinder. It is preferable to alternately wind around the pulley supported on the upper part of the outer cylinder and the pulley supported on the lower part of the inner cylinder.

The winch used in the present invention may be a known one which is generally mounted on a ship. The washer of the present invention only needs to be configured to be able to project and retract below the inner cylinder that has been lifted to a predetermined height or more. For example, a horizontal position and an outer position that project to the lower side of the inner cylinder at a right angle to the inner surface of the outer cylinder. It is composed of a plate material that is pivotally supported on the inner surface of the outer cylinder so that it can rotate over a vertical position along the inner surface of the cylinder, or it is supported by the outer cylinder so that it can move horizontally both inside and outside the plane occupied by the inner cylinder. It may be composed of a plate or a bar.

The scaffold of the present invention is hung at the lower end of the inner cylinder so that it can be ridden through the inside of the inner cylinder or can be ridden through the human hole provided in the outer cylinder. Good. According to the present invention, the wire is unwound from the winch during a round trip, whereby the inner cylinder is lowered by its own weight to shorten the leader and reduce the water height of the leader.

In the present invention, a washer can be provided below the inner cylinder that is lifted to a predetermined height or higher. In this case, before moving on to the work, after the wire is wound around the winch to raise the inner cylinder to a predetermined height or more, for example, the washer is attached to the inner cylinder by riding on a scaffold suspended under the inner cylinder. By pulling out downward and receiving the inner cylinder from the lower side with this washer, the winch and the wire can be released from the load, and the inner cylinder can be held at a predetermined height. Further, if necessary, the inner cylinder is slightly lifted from a state where the inner cylinder is held at a predetermined height by this washer, and the washer is moved from below the inner cylinder by riding on a scaffold suspended under the inner cylinder, for example. Then, the leader can be shortened by freely suspending the inner cylinder below a predetermined height.

Although not essential to the present invention,
If the lower end of the inner cylinder received by the washer is fixed to the washer with a pin, a bolt, or a bolt and a nut screwed to the bolt, the length of the leader can be kept constant and the pile driving work can be performed. The stability can be increased.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sand pile driving ship according to an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in the side view of FIG. 2 and the front view of FIG. 3, this sand pile driving ship is equipped with, for example, three leaders 2 at the tip of the pier 1, and each leader 2 is a pier 1. The vertical outer cylinder 5 is supported by the backstay 3 which is erected upright, and the lower end is connected to the ship 1 by the pin 4, and the inner cylinder 6 is inserted from the upper end of the outer cylinder 5 so as to be able to move up and down. With.

As shown in the perspective view of FIG. 1, the outer cylinder 5 is formed in the shape of a quadrangular cylinder, and the inner cylinder 6 is thinner than this. The inner cylinder 6 is recessed inward at the center of a pair of opposite surfaces. It is formed in a square tube shape having a groove 7.

In each space surrounded by the outer cylinder 5 and the groove 7 of the inner cylinder 6, two portions are provided at the upper part of the outer cylinder 5 and the lower part of the inner cylinder 6, respectively.
Pulleys 8 supported individually are arranged, and these pulleys 8 and
A wire 9 whose tip is connected to the upper part of the outer cylinder 5 through one of the pulleys 8 supported on the upper part of the outer cylinder 5, and a winch 10 mounted on the backstay 3 as shown in FIG. The inner cylinder 6 is moved up and down by the extension drive device 11 having the. That is, when the wire 9 is wound around the winch 10, the inner cylinder 6 is raised, and when the wire 9 is unwound from the winch 10, the inner cylinder 6 is lowered by its own weight.

As a result, as shown in the operation explanatory view of FIG. 4, the inner cylinder 6 is lowered and the leader 2 is shortened at the time of rounding, so that the water height of the leader 2 can be lowered.
You will be able to navigate under the bridge that crosses the sea. Before the work, as shown in the operation explanatory view of FIG.
When the leader 2 is extended by raising, the vertical stroke of the casing and the vibro hammer (not shown) can be increased, and the depth of improvement can be increased.

In this embodiment, in order to reduce the tension acting on each wire 9, as shown in each operation explanatory view of FIGS. 1, 4 and 5, the wire 9 is attached to the tip of the wire 9. From the supporting upper pulley 8 to the lower one pulley 8, the upper pulley 8 supporting the tip of the wire 9, the other lower pulley 8, and the other upper pulley 8 are wound in this order, and FIG.
As shown in FIG. 3, the other pulley 8 on the upper side passes through the inside of the outer cylinder 5 and is wound around the winch 10.

At a predetermined height of a pair of inner surfaces of the upper portion of the outer cylinder 5 which face each other, the outer cylinder 5 has a predetermined height as shown by a solid line in FIG.
From a plate member pivotally supported so as to be rotatable at a right angle to the inner surface of the inner tube 6 and to project to the lower side of the inner tube 6 and a vertical position that rises along the inner surface of the outer tube 5 as shown in phantom in FIG. A pair of washers 12 are connected to each other via hinges 13.

Further, below the hinges 13, the outer cylinder 5 is provided.
Is provided with an inner flange-shaped flange 14 that receives both washers 12 from the lower side in a horizontal position, and the washer 12 located in the horizontal position can be fixed to the flange 14 by, for example, bolts and nuts. Furthermore, the above washer 1
A horizontal position 2 receives the bottom surface of the inner cylinder 6 from below, and is fixed to the bottom surface of the inner cylinder 6 by a bolt that is inserted into a washer 12 and screwed into the bottom surface of the inner cylinder 6.

When the inner cylinder 6 is moved up and down, as shown by the chain double-dashed line in FIG. 5, each washer 12 is positioned in a vertical position so as not to prevent the inner cylinder 6 from moving up and down. Then, the washers 12 are tilted to the horizontal position, and the washers 12 are fixed to the flange 14 by, for example, bolts and nuts.

After this, as shown in FIG. 1, the inner cylinder 6
The inner cylinder 6 is positioned at a predetermined height by lowering the bottom surface thereof until it is received by the washer 12 positioned in the flat position. The height of the inner cylinder 6 is stabilized to some extent just by receiving it on the washer 12, and the stability of the work can be obtained. However, in this embodiment, the bottom surface of the inner cylinder 6 is further inserted into the washer 12, for example. By fixing the bottom surface of the inner cylinder 6 to the washer 12 with a bolt screwed to the bottom surface of the cylinder 6, the work stability is further enhanced.

In order to fix or disassemble these washers 12 to the flange 14 and to fix or disassemble the inner cylinder 6 to the washer 12, a scaffold 15 is suspended at the lower end of the inner cylinder 6 and is shown in FIG. As described above, a worker can get on and off the scaffold 15 from the inside of the inner cylinder 6 through the manhole 16 formed on the bottom surface thereof.

[0026]

As described above, in the sand pile driving ship of the present invention, the leader supported on one side of the pontoon is provided with the outer cylinder of the vertical axis, and the outer cylinder is vertically movable. Since the inner cylinder is configured to move up and down with the extension drive device, the leader can be shortened when traveling to allow free passage under the bridge that crosses the sea, and bypass the bridge. It is not necessary to do so, and the cost of voyage can be reduced, and it is possible to call at a port beyond the bridge.

Further, by extending the leader before the work, it is possible to increase the lifting stroke of the casing and the vibro compactor which are guided by the leader to ascend and descend, thereby increasing the improvement depth.

Further, according to the present invention, since the pulley and the wire of the extension drive device are arranged between the inner and outer cylinders, it is possible to prevent the wire from vibrating between the upper and lower pulleys and colliding with each other. It becomes easier to get on and off the scaffold through the inside of the cylinder, and the workability of fixing the inner cylinder to a predetermined height and releasing the fixation can be improved.

In the present invention, in the case where a washer for retracting under the inner cylinder suspended above a predetermined height is provided,
The inner cylinder can be held at a predetermined height by placing the washer under the inner cylinder that has been lifted to a predetermined height or higher, and then the inner cylinder can be received by this washer, thus stabilizing the pile driving work. Can be increased. In this case, in particular, if the bottom of the inner cylinder can be fixed to the washer that receives the inner cylinder by, for example, bolts and nuts, the stability of the pile driving operation can be further enhanced.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of the present invention.

FIG. 2 is a side view of the present invention.

FIG. 3 is a front view of the present invention.

FIG. 4 is an operation explanatory diagram when the leader is shortened according to the present invention.

FIG. 5 is an explanatory diagram of an operation when the reader is expanded according to the present invention.

[Explanation of symbols]

 1 Ship 2 Leader 5 Outer cylinder 6 Inner cylinder 8 Pulley 9 Wire 10 Winch 11 Extension drive device 12 Washer

Claims (2)

[Claims] 1. A leader having a vertical axis outer cylinder supported on one side of a ship and an inner cylinder inserted into the outer cylinder so as to be able to move up and down; and an upper part of the outer cylinder between the inner and outer cylinders. Alternatively, an extension drive device having a pulley supported on an upper portion of an outer cylinder and a lower portion of an inner cylinder, a winch mounted on a pontoon or an outer cylinder, and a wire for lifting an inner cylinder whose one end is wound around the winch is provided. A sand pile driving ship characterized by being equipped. 2. The sand pile driving ship according to claim 1, further comprising a washer that is retracted under an inner cylinder that is lifted to a predetermined height or more.