JPS5932620B2 - Elevating guide frame elevating mechanism for deep soft ground improvement vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for raising and lowering a ground improvement machine in a deep soft ground improvement ship used to harden and improve soft ground deposited in large quantities on the seabed (tube bottom) by filling with cement or the like. This invention relates to a mechanism for lifting and lowering a guide frame.

As shown in Fig. 1, the deep soft ground improvement ship has a soft ground improvement machine 5 suspended from a tower 2 mounted on a barge 1 using a wire rope 4 wound around a winch 3 so as to be able to rise and fall. The improved machine 5 is connected to an elevating guide frame 6 for smoothly raising and lowering it, and the elevating guide frame 6 can be raised and lowered relative to the barge 1.

The lifting and lowering of the lifting guide frame 6 of this mechanism is carried out by the lifting and lowering of the soft ground improvement machine 5 and the lifting and lowering of the lifting guide frame 6, respectively, by separate operations such as winches.

Such an operation is very complicated and has the disadvantage that the amount of winding of the winch for lifting and lowering the lifting guide frame 6 is also very large. In order to cover such shortcomings, the second and third
A differential lifting mechanism using a movable pulley as shown in the figure can be considered.

In other words, the mechanism is such that the vertical speed of the vertical guide frame is y/2 with respect to the vertical speed V of the soft ground improvement machine 5, and the stroke is also li. However, these mechanisms are the fourth,
It includes the drawbacks shown in Figure 5. That is, Fig. 4 a, b
To explain this, the lifting guide frame 6 interferes with the soft ground for the ground to be improved at a depth of H from the position l from the sea surface, such as section P-P, and the soft ground improvement machine 5 touches the ground to be improved. A phenomenon occurs in which unimproved portions of these portions remain. Further, as shown in FIG. 5, if the soft ground improvement machine is forced into the soft ground to a depth of H, the lifting guide frame 6 will be pushed into the soft ground to a depth of lh, which may cause various troubles. The present invention has been made in view of these circumstances, and aims to eliminate the conventional drawbacks with a simple configuration and improve the efficiency of improving soft ground.

To explain the details of the embodiment of the present invention with reference to FIG. 6, 11
is a barge, and a tower 12 is mounted on the barge 11. A pulley 13 is installed at the tip of the tower 12, and a wire rope 15 from a winch 14 on the barge 11 passes through the pulley 13 and a pulley 17 installed at the upper end of the soft ground improvement machine 16. The section is connected to a pulley 13 at the tip of the tower. Reference numeral 18 is an elevating guide frame that can be raised and lowered along the side of the tower by a guide 19 provided on the side of the tower or barge, and on the outside of the elevating guide frame 18, there is a guide 19 provided on the side of the soft ground improving machine 16. The provided guide 20 is connected so that the soft ground improving machine 16 can move up and down with respect to the lifting guide frame 18.

Furthermore, a movable pulley 21 is provided at the lower end of the lifting guide frame 18.
21 is mounted on the shaft, and the guide 2 of the soft ground improving machine 16 is
A wire rope 22 with one end fixed to the pulley 21
, 21, another fixed pulley 23 provided on the tower 12, and then wound onto another winch 24 provided on the barge 11.

By arranging the wires as described above, the wire 15
The movable pulley 2 moves up and down as the soft ground improvement machine 16 winds up.
1, the guide frame 18 differentially follows and guides the soft ground improvement machine 16 without the need for any control.

In addition, when the seawater layer is shallow and the improved ground is deep as shown in Fig. 4 b and Fig. 5 b, the wire 22 is
By winding the guide frame 18 by the length of , the guide frame 18 differentially follows the soft ground improvement machine 16 without interfering with the soft ground.

When ascending, the wire 22 is
By untying the guide frame 18, the guide frame 18 differentially follows the rise of the soft ground improving machine 16 and can be stored in a predetermined position. In this way, the present invention uses a wire rope connected at one end to the soft ground improving machine, using the pulley fixed to the lower part of the lifting guide frame as a movable pulley, and using the pulley at the top of the barge tower as a fixed pulley. A series of mechanisms in which the guide frame and tower are differentially connected for lifting and lowering, and the other end of the wire rope is wound up with a winch on a barge, allows the lifting guide frame to follow the lifting and lowering of the soft ground improvement machine as it moves up and down. Needless to say, in the case of shallow water, the soft ground improving machine can be raised and lowered by winding the winch without the lifting guide frame interfering with the soft ground layer.

[Brief explanation of the drawing]

Figure 1 is a front view of the conventional example, Figures 2 and 3 are front views of the main parts of the improved example, Figures 4A, b and 5 are explanatory diagrams of the improved example, and Figure 6 is the present invention. FIG. 11...Barge, 12...Tower, 13
...Pulley, 14...Winch, 15.
... wire rope, 16 ... soft ground improvement machine, 17 ... pulley, 18 ... lifting guide frame, 19 ... guide, 20 ...
... Guide, 21 ... Moving pulley, 22 ...
・・Wire rope, 23 ・・・Fixed pulley, 24
······winch.

Claims (1)

[Claims] 1. A lifting guide frame in which a soft ground improving machine is suspended from a tower mounted on a barge so that it can be raised and lowered by a wire rope from a winch on the barge, and the soft ground improving machine can be raised and lowered from the side of the tower. In this mechanism, a pulley provided at the lower end of the lifting guide frame is used as a movable pulley, a pulley provided on the tower is used as a fixed pulley, and a wire rope with one end fixed to the soft ground improvement machine is used as a movable pulley. An elevating guide frame elevating mechanism for a deep soft ground improvement ship characterized by differentially connecting a movable pulley and a fixed pulley, and connecting the other end of a wire rope to another winch on a barge.