JPS58138812A - Footing device for deck elevation type working platform - Google Patents

Abstract

PURPOSE:To shallow the draft of hull by attaching a movable footing protrudable to the outside of the bottom and also accommodatable into the bottom to the bottom of the peripheral edge of a fixed footing. CONSTITUTION:A fixed footing 4 accommodatable into a leg well 3 is attached to the lower end of an elevating leg 1 along the leg well 3 of a hull 2, and a movable footing 5 extrudable to the outside of the bottom of the fixed footing 4 and also accommodatable into the bottom is attached to the peripheral bottom of the fixed footing 4. Since the movable footing 5 turns around a pin 6 as a shaft, the movable footing 5 is accommodated into the bottom of the fixed footing 4, the leg 1 is raised, and the footings 4 and 5 are accommodated into the leg well 3, whereupon the projection from the bottom face of the hull 2 is removed, and therefore, the draft of the hull can be shallowed when towing the hull 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a footing device for a deck elevating work platform.

Deck elevating work platform leg 01, hull 02, leg well 03
, footing 04, etc., are usually constructed as shown in FIG.
The footing 04 always projects downward from the bottom surface of the hull 02. In this way, footing 0
The reason why the ground contact area of 4 is made large is that the axial load 05 acting on the leg 01 is supported by the γN bottom ground 07 with a relatively small penetration depth 06, as shown in Fig. 2. If the ground 07 is soft soil, the footing 0
4 requires a fairly large ground contact area. For this reason, in the conventional device described above, the large footing 04 always protrudes downward from the bottom surface of the hull 02, so when the hull is towed, the water 08 becomes deep, making it difficult to tow the hull into shallow water areas. In addition, the protruding footing 04 often gets in the way, making it difficult to tow it on a purge or the like.

As a countermeasure to overcome the drawbacks of the conventional device mentioned above, the sixth
As shown in the figure, a large leg well part 09 that can accommodate a large type 4 with a large ground contact area is attached to the hull 02.
It is possible to install it in the ship, but due to problems with the hull structure,
There is a limit to increasing the size of the leg well, and providing a leg well on the hull that can accommodate a large footing with a new size and ground contact area is not actually a -F problem, such as It is not a countermeasure.

The present invention solves the above-mentioned drawbacks of the conventional device, and when the leg is fully lowered and the lower end footing touches the bottom, it makes a large contact with the ground, and when the leg is raised, it is stored in the leg well. This was proposed for the purpose of providing a footing device for a deck lifting work platform that can occupy as small an area as possible, and is raised and lowered by a lifting means along a leg well provided in the hull. A footing that can be stored in the leg well is fixed to the lower end of the leg, and a footing that can be stored in the bottom of the leg well is fixed to the bottom of the peripheral line of the fixed footing. 1. This invention relates to a footing device for a deck elevating work platform, which is characterized by being equipped with a fixed movable footing.

Hereinafter, non-inventions will be specifically invented using examples shown in FIGS. 4 to 7. In Figures 4 and 5,
Reference numeral 1 denotes a leg that supports the hull 2 during operation. In this example, the leg 1 has a triangular cross-sectional shape, and passes through each of the six leg wells 6 provided in the hull 2. It is arranged so that it can be raised and lowered in the vertical direction, and the inside of the leg well section can be raised and lowered by a lifting means (not shown) installed between it and the hull 2.
Note that the leg wells are set to a size that does not cause any problems with the 4't4 construction of the hull 2. Reference numeral 4 denotes fixed footings fixed to the lower ends of the legs 1, respectively.
Reference numeral 5 denotes a movable footing provided around the bottom of the fixed footing 4 so as to be rotatable downward by a bottle 6. In the illustrated example, the movable footing 5 is attached to the leg 1
As shown in Fig. 6, three movable footings 5 are attached around the bottom surface of the fixed footing 4 to match the cross-sectional shape of the footing 5. As shown in FIGS. 5 and 6, the fixed footing 4 protrudes outward from the bottom surface, and as shown in broken lines in FIGS. 5 and 7, the fixed footing It is designed to fit within the bottom of the 4.

Then, when the movable footings 5 are in a state of protruding outside the bottom surface of the fixed footing 4, the reaction force of the load acting on the bottom surface of the movable footing 5 is It is supported by a support part 11. As shown in FIG. 5, each wire rope Z8 is a wire rope whose one end is connected to the appropriate position of each movable footing 5, and the other end of each wire rope Z8 is an eye play attached to the leg 1).9.10. connected. The wire loafs 7 and 8 are operated by operating means such as a hoist or a crane (not shown) normally installed on the hull 2, but when the movable footing 5 is made to protrude outward from the bottom of the fixed footing 4 ( d1 The wire rope 7 is controlled by the operating means.
When the movable footing 5 is to be pulled under the bottom surface of the fixed footing 4, the wire rope 8 is loosened at the same time as the wire rope 8 is pulled. , when a deck elevating work platform having the above-mentioned footing device and equipped with the footing device of the present invention is towed to a work site, each movable footing 5
are housed under the bottom surface of the fixed footing 4 via the wire ropes 7 and 8 by the operating means, and the leg 1 including the fixed footing 4 is housed in the leg well section of the hull 2, and each movable footing 5 Since the fixed footing 4 including the fixed footing 4 can be towed without protruding below the bottom surface of the hull 2, the towing resistance is small and the towing can be easily carried out even in shallow sea areas. Furthermore, since there is no protruding part under the bottom surface of the hull 2, it is easy to load it on a purge or the like and tow it.

After the deck elevating work platform is towed to the work site as described above, each leg 1 is lowered along the leg well 3 of the hull 2 by the lifting means to perform the work at the work site. The footings 5 are placed on the bottom, but before they are placed on the bottom, by operating the operating means of each movable footing 5, each movable footing 5 stored under the bottom surface of the fixed footing 4 is fixed. The footing 4 is caused to protrude outward from the bottom surface and land on the bottom. As a result, each movable footing 5 acts to agitate the cart from the seabed side, and the bottom surface of these movable footings increases the contact area with the seabed ground. - Also, the stress generated in the seabed ground is the vertical load acting on leg 1 divided by the bottom area of the footing, and the depth of penetration of leg 1 into the seabed is, in the case of soft ground, the corresponding Almost proportional to stress. Therefore, I
T]1fj, I The depth of penetration of the leg 1 decreases by the amount that the bottom area increases due to the footing 5.

It's ox, layer 11 is placed on top and the leg well of hull 2 is F'1lS.
3, if the wire port 7 is loosened, the movable footing 5 can freely rotate downward about the pin 6 and has no resistance to external force from above. The resistance when pulling out the lower end of the leg 1 including the fixed footing 4 from the seabed ground is small O. Furthermore, the movable footing 5 and the fixed footing 4
If the hull 2 is stored in the leg well 6 of the hull 2, there will be no protrusion below the bottom surface of the hull 2, so it will be easy to put the hull 2 on a purge or the like and tow it to a work site or the like.

Since the device of the present invention has the above-described configuration and operation, the present invention enables deck elevating and lowering that eliminates the drawbacks of the conventional device without enlarging the leg well portion 6 of the hull 2. The present invention has the practical effect of realizing a footing device for a type workbench.

In the above embodiment, the cross-sectional shape of the leg 1 is triangular;
Although the case where three movable footings are attached is shown, it goes without saying that an appropriate number of movable footings may be attached depending on the cross-sectional shape of the leg 1.

Next, in another embodiment of the present invention shown in FIGS. 8 and 9, the movable footing 5 is rotatably supported on the fixed fluting 4 by a pin 16, and 1. By rotating in the direction of arrow X shown in FIG. vinegar,
The difference is that the movable sorting 5 is configured to protrude outward from the bottom surface of the fixed footing 4 or to be housed in the bottom surface F of the fixed footing 4, but they have similar functions and effects. be.

These other embodiments of the invention, shown in FIGS. 10 and 11, replace the movable footing 5 with the fixed footing 4.
By attaching it so that it can slide as shown by the arrow y on the 1-side surface of the fixed sorting 4, it protrudes outward from the bottom surface of the fixed sorting 4 and is stored under the bottom surface of the fixed footing 4. Although this embodiment differs from the above embodiment in terms of its structure, it has similar functions and effects.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams of one example of a conventional device, with Figure 1 being a side view, Figure 2 being an explanatory diagram when bottoming out, and Figure 6 being a more detailed view of the hull than before. Figure 4 is an explanatory diagram of a case where the leg well is designed to be large so that the footing can also be accommodated in the leg well. Figure 4 is the main figure, Figure 5 is the attachment to the fixed footing and I'
Fig. 6 is a sectional view of the Vl-Vl gland in Fig. 5, and Fig. 7 is a diagram showing the operation mode of the iTI assistant footing 1'/g. 8 and 9 are schematic explanatory diagrams of other embodiments of the present invention, and FIG. 8 is a plan view, and FIG.
The figure is a side view, FIGS. 10 and 11 are schematic illustrations of still other embodiments of the present invention, FIG. 10 is a plan view, and FIG.
The figure is a side view. Figure 4 Docking In Figure 11, 1: Leg, 2: Hull, 6: Leg well, 4: Fixed footing, 5: Movable footing. Sub-agent Patent Attorney Teru Ito (2 others) Tail 9 Figure Horse 11 Figure

Claims (1)

[Claims] A footing that can be stored in the upper wiring well is fixed to the lower end of the leg that is raised and lowered by the lifting means along the leg well provided in the hull, and the fixed foot is attached to the bottom of the peripheral edge of the fixed footing. A footing device for a deck elevating work platform characterized by being equipped with a movable footing that can protrude outside the bottom surface of the platform and can be stored inside the bottom surface.