JPS6319387Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the structure of an elevating work barge, in particular,
By raising and lowering the legs relative to the work barge and raising and lowering the work barge relative to the independent legs using separate dedicated lifting devices, we aim to shorten the time required to raise and lower the legs, thereby making it possible to reduce the time required to raise and lower the legs before and after work in the work area. This invention relates to the structure of an elevating work barge that can reduce lost time.

As a work barge used for various types of work in the work area, it has multiple legs that can be raised and lowered.These legs are raised and towed, and when it arrives at the work area, these legs are lowered to reach the bottom of the water. An elevating work barge is used, which is self-supporting and uses legs to raise the work barge from the water surface to a safe space. Once the work is complete, perform the reverse operation to return the vessel to a towable state and move it to its next destination.

The following types of elevating mechanisms for this type of elevating work platform have been implemented.

a Rack and pinion method b Tooth and bar
Method c Friction retention method d Pin-and-slot method e Wire method In all of these methods, the same lifting device is used to raise and lower the legs and raise and lower the work barge. was. For this reason, the rack-and-pinion system, the toe-and-bar system, and the pin-and-slot system have the drawback that the lifting and lowering of the legs is slow, and this requires a large amount of time, resulting in lost time. or,
In the above-mentioned frictional holding method, the lowering of the legs is performed by free fall, so it can be performed in a short time, but the lowering of the legs is performed using the inchworm method, which also has the disadvantage that it takes a long time, resulting in lost time. Furthermore, although the wire method allows the legs to be raised and lowered quickly, it has the disadvantage that it cannot be carried out if the weight of the work barge is large because the work barge is lifted with wires.

Therefore, in the case of a conventional lifting type work barge in which the legs are raised and lowered and the work barge is raised and lowered using the same lifting device, if the weight of the work barge is large, methods other than the above-mentioned friction retention method cannot be used. It takes a lot of time to both raise and lower the legs, and with this frictional holding method, it takes a lot of time to raise the legs, and in either method, time is wasted in the preparation stages before and after work, and the work is delayed. It has the disadvantage of low efficiency.

The purpose of the present invention is to eliminate the drawbacks of the conventional elevating type work barge, and to raise and lower the legs and raise and lower the work barge using dedicated lifting devices, thereby improving work efficiency without increasing costs. Even if the barge is heavy, the legs can be raised and lowered quickly.
It is an object of the present invention to provide an elevating work barge that can significantly reduce loss time before and after work.

The feature of the present invention is that the above object is achieved by using a winch to raise and lower the legs and by using a separately provided dedicated lifting device to raise and lower the work barge.

That is, according to the present invention, in an elevating work barge that has a plurality of legs that can be raised and lowered and that can be raised and lowered with respect to the legs that are independent on the bottom of the water, the raising and lowering of the legs is performed by winding a wire with a winch. There is provided an elevating type work barge, characterized in that the work barge is lifted and lowered with respect to the legs using a dedicated lifting device provided separately.

FIGS. 1 to 5 are diagrams showing an embodiment of an elevating type work barge according to the present invention, and the present invention will be specifically explained below with reference to these drawings.

In FIG. 1, a work barge 1 has a plurality of holes (in the illustrated example, four
A leg 2 of the book) is provided. A winch 3 is provided on the work barge 1 in correspondence with each leg 2, and the tip of a wire 4 wound in and unwound by these winches is connected to each leg 2. Each winch 3 and wire 4 constitute a lifting device for the leg 2, and by operating these, each leg 2 can be raised and lowered with respect to the work barge 1.
Further, on the work barge 1, a lifting device 7 is provided for each leg to raise and lower the work barge 1 with respect to each leg 2 which is fixed to the bottom of the water by standing on its own.

Therefore, in the elevating type work barge shown in FIG. 1, the lifting and lowering of the plurality of legs 2 is performed by winding the wire 4 with the winch 3 and free falling, and raising and lowering the work barge 1 with respect to the legs 2 is separately provided. It is configured to be carried out using a dedicated elevating device 7.

When towing the work barge 1 to the work area, the second
As shown in the figure, the wire 4 is wound in by a winch 3, and each leg 2 is raised and floated on the water surface 5 and moved. When the work area is reached, the wire 4 is unwound from the winch 3 to allow each leg 2 to fall freely, and the legs 2 are placed at the bottom 6 of the water, as shown in FIG.
to become independent. After making each leg 2 independent on the bottom of the water in this way, by operating the lifting device 7,
The work barge 1 is raised relative to the legs 2, and the work barge 1 is set at a position in a safe space 8 at a predetermined height above the water surface 5. With the work barge 1 installed in the safe space 8 in this manner, a predetermined work in the water area, such as a boring work on the seabed, is started. It should be noted that the safe space 8 is a position sufficiently separated from the water surface 5 to such an extent that external forces due to waves etc. do not act on the work barge 1.

After completing work such as seabed boring, the work barge 1 is lowered from the safety space 8 to the water surface 5 using the lifting device 7, and then each leg 2 is lowered by winding the wire 4 with the winch 3. The vessel is raised and returned to the state shown in Fig. 2 to be able to move on the water surface 5, and then towed to the next destination.

The elevating device 7 of the work barge 1 may be a rack-and-pinion type, a toe-and-bar type, or
Conventionally known devices such as a friction retention system or a pin and slot system can be used. FIG. 5 is a diagram showing, as an example, a case in which a device based on the same principle as a center hole jack is used as the lifting device. Hereinafter, an example of the structure and operation of the elevating device 7 will be specifically explained with reference to FIG. 5.

In FIG. 5, an on-deck girder 9 through which the legs 2 pass is fixed on the work barge 1.
Lifting devices 10, 10 are housed on both sides of the legs 2 in this on-deck girder. In the illustrated example, a bear lock jack, which is a type of center hole jack, is used as the lifting device 10, and each bear lock jack 10 has a rod 1.
1 is inserted.

The rod 11 can be suspended at a predetermined height of the leg 2 by fitting the eye 11A into a pin 12 inserted into a slot at a desired height in the leg 2. Note that a guide bush 15 and a guide roller 16 are provided between the upper frame 14 through which the pin 12 is inserted, the work barge 1, and the leg 2 to prevent uneven contact at each location.

The elevating device 10 is installed on a lower pedestal 17, and its upper and lower parts are supported via cushions 18 to reduce impact.

Each lifting device 10 has a cylinder 19 and a piston 20
Each of these cylinders and pistons has a locking (tightened and fixed state)) and an unlocking (relative movement in the vertical direction) relative to the rod 11.
Bear locks 21 and 22 are provided respectively, which are controlled to each state. The piston 20 is actuated by hydraulic pressure, and moves downward when hydraulic pressure is supplied from arrow A, and rises when hydraulic pressure is supplied from arrow B.

The bearing locks 21 and 22 provided in the cylinder 19 and the piston 20 are elastically deformed by applying high pressure oil pressure to the rod 1.
1 is locked and unlocked.
In this case, there is a pressurized lock type that is fixed in an interference fit state when hydraulic pressure is applied, and a non-pressure lock type that is fixed in an interference fit state when hydraulic pressure is released, and elastically deforms and loosely fitted when hydraulic pressure is applied. There are two types: a lock type and a lock type, but either type can be used as the bear locks 21 and 22.

When raising the work barge 1 from the position on the water surface indicated by the solid line to the position of the safety space 8 indicated by the two-dot chain line with the legs 2 independent on the water bottom, the lifting device 10 is relatively moved upward along the rod 11. Then, the work barge 1 is raised via the on-deck girder 9. When the lifting device 10 is raised, the lower bear lock 22 is locked and the upper bear lock 2 is locked.
1 is in an unlocked state and oil pressure is supplied from arrow A, the on-deck girder 9 and the work barge 1 are raised by the stroke of the piston 20. Next, the bearing lock 21 is locked, the lower bearing lock 22 is unlocked, and hydraulic pressure is supplied from the direction of arrow B, so that the piston 2
0 by a predetermined stroke. Then, the lock/unlock state and the hydraulic pressure supply direction are reversed again and the stroke is increased in the same manner as described above. By repeating these steps, you can raise it to a safe space.

On the other hand, when lowering the work barge 1 from the safety space 8 to a position above the water surface 5, the work barge 1 is lowered above the water surface 5 by repeating the operation opposite to the above-mentioned raising operation. I can do it.

According to the embodiment described above, the lifting and lowering of the leg 2 with respect to the work barge 1 is performed by winding the wire 4 with the winch 3 and free falling into the water, and the lifting of the leg 2 with respect to the work barge 1 is performed by winding the wire 4 with the winch 3 and free falling into the water. Since the lifting and lowering is performed by a dedicated lifting device 7 provided separately, the lifting speed of the work barge 1 relative to the leg 2 is substantially the same as that of the conventional system, but
The time required for raising and lowering can be quickly performed at any speed that is completely independent of the raising and lowering speed of the work barge. That is, the lifting and lowering of the legs 2 can be carried out at a much higher speed than the lifting speed of the work barge 1 due to the winding of the wire 4 by the winch 3 and free fall. Therefore, the preparation time before and after work on the work barge 1 (the work barge held in the safe space 8) can be significantly shortened, and loss time can be eliminated.

In addition, since the lifting and lowering of the legs and the lifting of the work barge are carried out using separate lifting devices, the respective lifting and lowering speeds can be set as necessary, improving the operating rate and ensuring safety. be able to.

As is clear from the above description, according to the present invention, the lifting and lowering of the legs and the lifting of the work barge are performed using separate lifting devices, and the lifting and lowering devices for the legs can be relatively inexpensive and can be moved up and down at high speed. Since it uses a winch and wire, it has a simple structure and can greatly reduce the preparation time before and after work.
As a result, an elevating work barge that can improve work efficiency and reduce work costs can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the overall structure of an embodiment of the elevating type work barge according to the present invention, and Fig. 2 shows the state in which the elevating type work barge of Fig. 1 is towed along the water surface to a working area. Figure 3 is a side view showing the work barge with its legs lowered and standing on the bottom of the water in the working area, Figure 4 is a side view showing the work barge raised to a safe space, Figure 5 is the side view showing the work barge raised to a safe space. FIG. 2 is a vertical sectional view illustrating a specific structure when a center hole jack is used as a lifting device for the work barge shown in FIG. 1; 1...Work barge, 2...Leg, 3...Winch,
4...Wire, 5...Water surface, 6...Bottom, 7...
Lifting device for work barge, 8... Safety space, 10...
Lifting equipment, 11...rod.

Claims (1)

[Scope of utility model registration request] In an elevating work barge that has a plurality of legs that can be raised and lowered and that can be raised and lowered with respect to the legs that are independent on the bottom of the water, the legs are raised and lowered by winding a wire with a winch and free falling, and An elevating work barge characterized in that the elevating and lowering of the work barge relative to the legs is performed by a dedicated elevating device provided separately.