JP2638908B2 - Bridge crane leg structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leg structure of a bridge crane capable of changing a traveling path.

[Prior Art] Generally, a bridge-type crane is constructed by erection of a crane girder having a hanger at the upper end of a pair of tall legs that can run in the same direction across a work place. The legs are adapted to travel along rails laid on the floor of the workplace.

By the way, the bridge-type crane as described above is also used in a low-level radioactive waste burial site. A number of parallel rails are laid on the floor of the low-level radioactive waste repository, and a number of concrete sections are arranged vertically and horizontally between each rail. In such a burial site, a bridge-type crane is used to store drums filled with low-level radioactive waste in each of the compartments.

[Problems to be Solved by the Invention] However, in a low-level radioactive waste burial site as described above, if the drums are stored in all the sections between certain rails, the bridge crane must be moved to the next traveling path. No.

Conventionally, since it is necessary to move the bridge crane only once every few months, the bridge crane must be disassembled and assembled on the next traveling path each time. However, even once every few months, dismantling and assembling bridge-type cranes requires a large amount of manpower and equipment, which increases the cost of burying low-level radioactive waste. was there.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a leg structure (hereinafter, abbreviated as a leg structure) of a bridge-type crane capable of easily changing a traveling path. It is an object.

[Means for Solving the Problems] A leg structure according to the present invention includes a pillar extending vertically.
The pedestal section push-up mechanism provided below the pedestal section, and a cylindrical body coaxially arranged around the pedestal section push-up mechanism by a bogie section, the pedestal section, When the pillar push-up mechanism is not operated, it is supported via the bogie unit by a bracket provided so as to be placed on the upper end of the cylindrical body, and is released from the bracket when the pillar push-up mechanism is operated. A thrust bearing is provided which pushes up a lower end of the cylindrical body which is relatively spaced apart, lifts the bogie portion via the cylindrical body, and rotatably supports the bogie portion.

[Operation] In the leg structure having the above configuration, when the pillar push-up mechanism is operated, the push-up mechanism pushes the track, and first,
Only the pillar portion is lifted with the bogie portion left on the track.

Then, the bracket of the pillar portion and the upper end of the cylindrical body are separated from each other, and then the upper surface of the thrust bearing and the lower end of the cylindrical body come into contact with each other, and the bogie portion is lifted via the cylindrical body.

In this way, by lifting the bogie units off the track, each bogie unit can be rotated by 90 °. Therefore, if a rail for moving to the next traveling path is laid on the floor of the burial site, the bridge crane can be moved to the next traveling path and used by placing the bogie on the rail.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. 5 to 7 are views showing a bridge type crane A using the leg structure of the embodiment,
FIG. 4 is a plan view showing a low-level radioactive waste burial site where the bridge type crane A is used. Here, prior to the description of the embodiment, a schematic configuration of the burial site and the bridge crane A will be described.

In FIG. 4, reference numeral 1 denotes a floor, on which a plurality of rails (hereinafter referred to as horizontal rails) 2... Between 2 and 2, buried equipment groups 3a to 3h are provided, respectively. Here, the burial site shown in FIG. 4 is provided on a sloping ground, and the height of the floor of the burial facilities 3a to 3h is made to gradually decrease from the upper one to the lower one in the figure. ing. Each of the buried equipment groups 3a is divided into five sections, and each of the five divided sections is provided with a concrete section 4 divided into 16 rooms. Also,
Between the burial equipment groups 3b, 3c, 3d, 3e, 3f, and 3g, passages 5 through which carts that carry drums to the burial site pass are respectively provided.

At the right end of the burial site, two rails (hereinafter referred to as vertical rails) 6.6 orthogonal to the horizontal rails 2 are laid. The vertical rail 6 is provided to be inclined in accordance with the inclination of the ground of the burial site.

On the other hand, the bridge crane A is mounted on two horizontal rails 2 and 2 and is capable of traveling in the left-right direction. As shown in FIG. 6, the bridge-type crane A is constructed by attaching a crane girder 8 whose longitudinal direction is directed to a direction substantially orthogonal to the horizontal rail 2 at the upper ends of a pair of legs 7,7. I have. The crane girder 8 has a rectangular frame shape in a plan view, and two trolleys 9 capable of traveling in the longitudinal direction of the crane girder 8 are provided on the upper surface thereof.
It is supported by the rails 10 of the book.

As shown in FIG. 7, the trolley 9 includes a base 11, a slide 12 that is movable with respect to the base 11 in the left-right direction in FIG.
A table 13 is attached to the slide 12 so as to be rotatable around a vertical line. The table 13 is provided with two winding rollers 14. Wires 15 are wound around the hoisting roller 14, and hanging members 16 are attached to the wires 15.

Eight pairs of claws 17 that can be opened and closed integrally are attached to the hanging tool 16 so that eight drums 18 can be lifted at a time. An extendable mast 19 is connected to the upper end of the hanging tool 16. The mast 19 is formed by sequentially fitting cylindrical bodies having different sizes to prevent the hanging member 16 from swinging. Note that reference numeral 20 in the figure denotes an operation room.

Next, the configuration of the leg 7 according to the embodiment of the present invention will be described in detail. In FIG. 7, reference numeral 30 denotes a pillar. The pillar 30 has a substantially U-shape whose upper part is open, and a bogie 31 that is separated from each other in the left-right direction is attached to a lower end surface thereof.

FIG. 1 shows the details of the bogie unit 31, and reference numeral 32 in the figure denotes a gantry. The gantry 32 is rotatably mounted with two wheels 33, 33 spaced apart from each other in the left-right direction. These wheels 33 are mounted on a motor 3 mounted on the upper surface of the carriage 32.
4, rotatable by a speed reducer 35 and a gear 36. Reference numeral 37 denotes a brake. Further, a stopper 38 is attached to the gantry 32. Stopper 38
The arm 38a has an intermediate portion rotatably supported, and a locking member 38b rotatably connected to the tip of the arm 38a.
It consists of:

Further, a tongue piece 39 projecting upward is formed at the upper end of the gantry 32. The tongue 39 has a cradle 40 with a pin 41
-It is rotatably connected via 41. On the other hand, the pillar
A bracket 42 is attached to 30. And
The pillar 30 is supported with its bracket 42 placed on the upper surface of the receiving table 40, and the carriage 31 is connected to the bracket 42 so as to be rotatable around a vertical line.

That is, reference numeral 50 in FIG. 2 denotes a hydraulic jack (push-up mechanism). The hydraulic jack 50 has a vertically movable piston 51 at its lower end, and the piston 51 is expanded and contracted by hydraulic oil fed into the inside thereof. A pusher 53 is attached to the lower end of the piston 51. A recess 53a that engages with the rail is provided on the lower surface of the pusher 53.
Are formed. At the lower end of the hydraulic jack 51, a ring-shaped thrust bearing 54 is attached.

On the other hand, a cylindrical body 55 penetrated by the hydraulic jack 50 is fixed to the cradle 40 of the bogie unit 31. A slight gap T is provided between the lower end surface of the cylindrical body 55 and the thrust bearing 54. With this configuration, the bogie unit 31 is vertically movable relative to the pillar 30 by the above-described gap T, and is relatively rotatable. Reference numeral 56 in the figure is a metal for preventing friction between the cylindrical body 55 and the hydraulic jack 50.

Next, the operation of accommodating the drums 18 in the sections 4 by the bridge-type crane A using the leg structure having the above structure will be described.

First, the drums 18 are carried into the passage 5 of the burial site by the transport vehicle 60 (see FIG. 6). Also, bridge crane A
Of the trolley 9 has been moved above the transport vehicle 60. next,
The hoisting rollers 16 are rotated to lower the hanging tool 16 to a predetermined position, and the claws 17 hold the drums 18.
In this case, the hanger 16 descends without swinging by the mast 19. Also, the attitude of the drum 18 ...
Since the position of the drum 18 and the hanging tool 16 may be slightly shifted, the table 13 may be rotated or
The position of the hanger 16 is finely adjusted by moving the twelve. Then, the gripped drum cans 18 are stored in the section 4, and when the section 4 is full, the lid 61 is closed. This lid 61 is also transported by the bridge type crane A.

Next, for example, when all the sections 4 of the buried facility group 3a also house the drums 18, the bridge crane A is moved to the buried facility group 3b.
The procedure for moving to is described.

First, the bridge crane A is moved to the right end in FIG. At this time, the bridge-type crane A has wheels 33 of the bogie unit 31.
Are located at the intersections of the horizontal rail 2 and the vertical rail 6, respectively. Next, hydraulic oil is supplied to the hydraulic jack 50 to bring the piston 51 into an extended state. Then, the pusher 53 presses the horizontal rail 2, and first, only the pillar 30 is lifted while the carriage 31 is left on the horizontal rail 2. Thus, the bracket 42 of the pillar 30 and the cradle 40 of the carriage 31
Are separated from each other, and then the upper surface of the thrust bearing 54 and the lower surface of the cylindrical body 55 come into contact with each other, and the bogie unit 31 is also lifted. As a result, the bogie unit 31 is supported by the thrust bearing 54, and is rotatable about its axis. When the wheel 33 and the lateral rail 2 are separated from each other and disengaged from each other, the bogie unit 31 is manually rotated by 90 °, and the piston 51 is reduced in this state. Then, the bogie unit 31 descends and the wheels 33 are put on the vertical rails 6. Next, the bridge crane A is moved to the buried facility group 3b, and the bogie section 31 is rotated by 90 ° by the same procedure as described above, whereby the movement of the bridge crane A is completed.

In the bridge type crane A using the leg structure having the above configuration,
By lifting the pedestal portion 30 and the trolley portion 31, the trolley portion is lifted from the horizontal rail 2, thereby enabling the trolley portion 31 to rotate. Therefore, the vertical rail 6 is laid on the floor 1 of the burial site. Just move it to the next buried facility group 3b. Therefore, there is no need to disassemble and assemble the conventional bridge crane A at all,
The cost of burying low-level radioactive waste can be greatly reduced.

Also, in the above-mentioned leg structure, the hydraulic jack 50 allows the
Both the bogie unit 31 and the bogie unit 31 are separated from each other, and each is lifted independently, and furthermore, since the bogie unit 31 is supported by the thrust bearing 54, the bogie unit 31 can be easily rotated manually, and , The structure can be simplified.

Although the horizontal rail 2 is pushed by the hydraulic jack 50 in the above embodiment, the floor 1 may be pushed. Further, the so-called lifting mechanism is not limited to the hydraulic jack 50 as described above, and various types such as a screw type may be applied. Further, in the above embodiment, the bogie unit
Although the two wheels 33 are provided on 31, the same effect can of course be obtained with one wheel.

[Effect of the Invention] As described above, in the leg structure of the present invention, a leg extending in the vertical direction is provided on a leg capable of traveling along a track,
A pair of bogies are provided at the lower end of the pillar in a direction along the track and are rotatable about a rotation center line pointing in the vertical direction. Part is equipped with a push-up mechanism that pushes the track or floor and lifts the pedestal part and the bogie part, so it is only necessary to provide a track for moving to the next runway on the floor of the burial site. The bridge-type crane can be easily moved, so that there is no need to disassemble and assemble the conventional bridge-type crane, and the cost of burying low-level radioactive waste can be significantly reduced. The effect is obtained.

[Brief description of the drawings]

1 to 7 are views showing an embodiment of the present invention. FIG. 1 is a side view showing a leg structure, FIG. 2 is a side sectional view showing the inside of a bogie, and FIG. Is a sectional view taken along the line III-III in FIG. 2, FIG. 4 is a plan view showing a low-level radioactive waste burial site, FIG. 5 is a plan view showing a bridge crane, and FIG. FIG. 7 is an enlarged view of FIG. 5 as viewed in the direction of the arrow VII. 1 ... floor, 2 ... horizontal rail (track), 7 ... leg, 8 ... crane girder, 30 ... pillar, 31 ... bogie, 50 ... hydraulic jack (push-up mechanism).

Claims (1)

(57) [Claims] 1. A leg structure of a bridge-type crane that runs along a track, wherein the leg portion has a pillar portion extending in a vertical direction, and a pillar portion pusher provided below the pillar portion. A lifting mechanism, and a cylindrical body coaxially arranged around the pillar push-up mechanism by a bogie unit. The pillar includes the cylindrical body when the pillar push-up mechanism is not operated. The lower end of the cylindrical body, which is supported by the bracket provided so as to be mounted on the upper end of the body via the bogie unit and which is relatively separated from the bracket when the pillar post lifting mechanism operates, pushes up the lower end of the cylinder. A leg structure for a bridge-type crane, comprising a thrust bearing that lifts the bogie portion through a body and rotatably supports the bogie portion.