JP2000038283A - Lifting device for block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lifting device for block capable of lifting and transporting a low strength block securely without breaking it. SOLUTION: A side face of a block 1 shaped like a circular column is surrounded by a cylindrical reaction force frame 11 by leaving a slight clearance, and a thin jack 12 attached to an inner side of the reaction force frame 11 in advance is provided between the side face of the block and the reaction force frame 11. Next, hydraulic fluid is fed into the inside of the thin jack 12 through an oil pipe to inflate the thin jack 12. The inflation of the thin jack 12 is applied as a side pressure on the side face of the block on an inner side due to binding of the reaction force frame 11 from the outside. Consequently, friction occurs between the side face of the block and the thin jack 12, one block is loaded on a wire rope 13 lifting the reaction force frame 11 through the friction, and the block 1 is lifted to perform required transportation. After it is transported to a predetermined position, hydraulic fluid inside the thin jack 12 is discharged to shrink it, and a clearance is formed again between the side faces of the block to remove a lifting device for block from a mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a block lifting device, and more particularly to a block lifting device suitable for lifting, transporting, loading and unloading low-strength blocks such as bentonite blocks.

[0002]

2. Description of the Related Art As a method of lifting a concrete block, three modes generally shown in FIGS. 5 to 7 have been generally adopted. That is, a claw 5 having an L-shaped cross section is provided around the lower portion of the cylindrical (or rectangular parallelepiped) block 1 '.
The lifting method of inserting and lifting the contact point as a contact point (see FIG. 5), and the lower end holding portion 6 'of the hanging member 6 intersecting the support shaft 6 "at the center is used to apply the leverage principle to the side surface of the block 1'. And a sucker method in which the suction cup 7 is pressed against the upper surface of the block 1 ', lifted and carried (see FIG. 7).

[0003]

However, when burying high-level radioactive waste, for example, it is formed by densifying bendite at a high density so as to surround the waste as a buffer between the ground. When a block is made of a low-strength block such as a block, any of the above methods has a small area for directly supporting the weight of the block, so that the compressive or tensile stress per unit area of the supporting portion increases, and the block is damaged. In any of the methods, since the side surface of the block is not protected during transportation after lifting, there is a problem that the block is damaged by a slight contact with an external obstacle.

Further, each system has the following disadvantages.
In the lifting method, the resistance when removing the claws is applied to the block as an external force, which may damage the block and cause the block to slip from the target installation location.In the sandwiching method, the horizontal cross-section of the block is circular or parallel. It is not possible to cope with a complicated shape other than the shape having the above, and the suction cup method cannot be applied when the upper surface of the block is rough. Furthermore, in the lifting method and the sandwiching method, the claw 5 and the holding portion 6 '
The clearance of 10 cm or more is required between the block and the loading / unloading side due to the existence of the low-strength block during the high-level radioactive waste disposal construction described above, but the clearance is limited to about several cm. It is desired.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to reliably lift and transport a low-strength block without damaging it, and to provide a block having a special shape or a rough surface. However, it is another object of the present invention to provide a block lifting device that can cope with a case where the clearance allowed at the loading / unloading side is small.

[0006]

SUMMARY OF THE INVENTION A block lifting device according to the present invention includes a reaction force frame facing a side surface of a block to be lifted, and a bag interposed between the side surface and the reaction force frame. A lateral pressure is applied to the side surface by injecting a fluid into the bag and inflating the bag, and the reaction force frame is lifted in this state.

That is, according to the present invention, the reaction frames are opposed to each other with a slight gap provided on the side surface of the block to be lifted, and a bag is interposed in the gap (a bag is well known inside the reaction frame). By injecting a fluid into the bag body and inflating the bag body, the expansion is limited by a reaction frame on the outside, and is applied as a side pressure to the side surface of the inner block. By generating friction between the side surface of the block and the bag body, the block can be lifted together with the reaction force frame through the friction, and the bag is contracted by discharging the fluid from the bag body to thereby reduce the size of the block. From the vehicle to enable loading and unloading.

[0008] The reaction force frame or the bag attached to the inside thereof is at least left and right (or front and rear) on the side surface of the block.
It is necessary to arrange so as to come on both sides and to sandwich the block by the above side pressure, preferably so that the reaction force frame faces the entire area of the block side, and the reaction force frame covers the entire area of the block side during transportation・ It can be protected.

In the present invention, since the flexible bag is inflated and brought into contact with the side surface of the block, the area for supporting the side surface of the block by the bag body can be made large, so that the side pressure per unit area can be reduced. Make it smaller
A low-strength block that is easily damaged can be reliably gripped and transported. Even if the side of the block has some irregularities, the bag can be pressed tightly to cope with it, and even if the block has a special shape, the part to press the bag is appropriately selected and the shape of the reaction frame Can be dealt with by designing as appropriate. Furthermore, since the bag is flat when no fluid is injected into the bag, the area occupied by the device on the side surface of the block is reduced, and the clearance at the loading / unloading side of the block is about several cm or less. Can be suppressed.

As described above, the bag may be any material as long as it is flexible and has a flat shape with no fluid injected therein and has a predetermined strength. Specifically, two stainless steel plates or the like are used. A thin jack or the like formed by welding the periphery of the superposed plate can be preferably used.

The fluid may be oil, air, water, or the like.

[0012]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 are schematic views showing the principle of a block lifting apparatus 10 according to the present invention, in which a columnar low-strength block (bentonite block) 1 is to be lifted. FIG. 3 is a horizontal sectional view of FIG.

The apparatus 10 comprises a cylindrical reaction force frame 11 for surrounding the side surface 2 of the block 1 with a slight gap,
There is provided a thin jack 12 as a bag attached to the inside of the reaction force frame 11 by screwing or other known means and interposed between the block side surface 2 and the reaction force frame 11. In addition, as the thin jack 12, two stainless steel plates of the same type and the same size are overlapped and welded between the peripheral edges of each plate to form a flexible hermetically sealed container. A thin jack manufactured by Showa Kiki Kogyo Co., Ltd. (product name "Pressure Disc") that can expand and contract the container
Were used as an example.

FIG. 1 shows a state in which a lifting device 10 in which each thin jack 12 is contracted is set to the block 1. From this state, hydraulic oil is fed into each thin jack 12 through an oil pipe (not shown). Each thin jack 12 is expanded (see FIGS. 2 and 3). The expansion of the thin jack 12 is applied as a side pressure to the inner block side surface 2 by the constraint of the reaction force frame 11 from the outside. Therefore, friction occurs between the block side surface 2 and the thin jack 12, and the wire rope 13 that lifts the reaction force frame 11 is loaded on the wire rope 13 by this friction for one block.
And carry out the required transportation. The lateral pressure can be changed as desired. After being transported to the predetermined position, the thin jack 12 is contracted by discharging the internal working oil, a gap is formed again between the block side surfaces 2, the device 10 is released, and the block 1 is released.

In actual use, it is desirable that the horizontal cross-sectional shape of the reaction force frame 11 substantially matches the horizontal cross-sectional shape of the block 1 as described above.
The apparatus 10 is set on the block 1 by lowering the reaction frame 11 having the thin jack 12 fixed to the inside of the lower block 1 from above, because the block outer periphery defined by the block side surface 2 and the thin jack 12 May hardly match with the inner circumference of the device 10 defined by the above with almost no gap. Therefore, it is desirable to design the reaction force frame 11 so as to be divided into two, for example, and set closer to the block 1 from the side. An example of such a design will be described below.

The lifting device 20 shown in FIG. 4 has a pair of left and right reaction force frames 2 corresponding to the reaction force frame 11 shown in FIG.
Shaft members 22, 22 'project upward from the upper surfaces of the shaft members 1, 21', a hydraulic cylinder 23 is interposed near the upper end between the shaft members 22, 22 ', and a shaft fulcrum 24 is located slightly below the center. , 24 ′ are set and the respective pivot points 24, 24 ′ are rotatably connected by link members 25.
Since the thin jack 12 is the same as the lifting device 10 except that two thin jacks 12 are provided in each of the reaction force frames 21 and 21 ′,
The same reference numbers are assigned.

When the lifting device 20 is set on the block 1, the rod 23 'of the hydraulic cylinder 23 is contracted so that the lower ends of the shaft members 22, 22' around the shaft fulcrums 24, 24 'are formed into a so-called eight-shape. The frame members 21 and 21 'are expanded. In this state, the frame members 21 and 21 'are lowered to a position facing the block side surface 2, and then the hydraulic cylinder rod 23' is extended. Thereby, the shaft member 2
The lower end sides of the shaft members 2 and 22 'are narrowed about the pivot points 24 and 24', and the frame members 21 and 21 'come closer to each other to be in the state shown in FIG. Then, the thin jack 12 is expanded and lifted as described above. At this time, the reaction force of the surface pressure generated by the expansion of the thin jack 12 can be absorbed by the hydraulic cylinder 23 via the reaction force frames 21, 21 'and the shaft members 22, 22'.

In the above embodiment, a cylindrical block is taken as an example. However, the shape of the block to be lifted is not particularly limited. For example, in the case of a rectangular parallelepiped block, at least one of two sets of parallel side surfaces is used. A flat frame member is opposed to the side surface of the set, and also, in the case of a specially shaped block, a frame member of an appropriate shape is opposed to a block side portion that can be sandwiched by lateral pressure, according to the same principle as described above. The block can be lifted.

[0020]

As described above, in the block lifting device according to the present invention, by increasing the contact area of the bag with the side surface of the block, the pressure applied to the side surface per unit area is reduced, and the block is lifted. Even a low-strength block that can be easily gripped and transported can be reliably held, and by using the reaction force frame that covers the entire side of the block, it is possible to effectively prevent damage to the block due to contact with obstacles being transported it can.

Further, by using a flexible bag, it is possible to cope with a block having a complicated shape or a block having a rough surface. By using a thin flat bag, the block side when the block is lowered is used. Even if the clearance of the part is small, it can respond.

[Brief description of the drawings]

FIG. 1 is a principle view of a block lifting device according to the present invention, showing a state where the device is set on a block.

FIG. 2 is an explanatory view showing a state in which hydraulic oil is injected into a thin jack from the state of FIG.

FIG. 3 is a horizontal sectional view of FIG. 2;

FIG. 4 is an explanatory view schematically showing a block lifting device provided with a reaction force frame divided into two.

FIG. 5 is an explanatory view schematically showing a lifting method in a conventional block lifting mode.

FIG. 6 is an explanatory view schematically showing a sandwiching method in a conventional block lifting mode.

FIG. 7 is an explanatory view schematically showing a sucker system in a conventional block lifting mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Block 2 Side surface (of block) 10, 20 Lifting device of block 11, 21, 21 'Reaction force frame 12 Thin jack 12 Upper plate-like member 22, 22' Shaft member 23 Hydraulic cylinder 24, 24 'Shaft fulcrum 25 Link member

Claims (2)

[Claims] 1. A bag comprising: a reaction frame facing a side surface of a block to be lifted; and a bag interposed between the side surface and the reaction frame, wherein a fluid is injected into the bag to remove the bag. A block lifting device characterized in that a side pressure is applied to the side surface by expanding the reaction frame in this state. 2. The block lifting device according to claim 1, wherein the reaction force frame faces the entire area of the side surface.