JPH01252492A - Bridge crane leg structure - Google Patents

Abstract

PURPOSE:To easily change a traveling passage by constituting the titled structure from a leg pillar part, a pair of dolly parts, pushing-up mechanism whose lower edge part lifts up the leg pillar part and the dolly part by pushing the rail or a floor, in the leg part which can travel along the rail. CONSTITUTION:The titled device is constituted of a leg pillar part 30 extending in the vertical direction, a pair of dolly parts 31 which are installed, separating in the direction along a transverse rail 2, at the lower edge part of the leg pillar part 30 and can be revolved around the revolution center line which is directed in the vertical direction, and a hydraulic jack 50 which is installed onto the leg pillar part 30 and in which the lower edge part pushes the transverse rail 2 or a floor 1 and lifts up the leg pillar part 30 and the dolly part 31, in the leg part 7 which can travel along the transverse rail 2. In this constitution, the leg pillar part 30 and the dolly part 31 are lifted up, and each dolly part 31 can be turned by 90 deg. by floating up the dolly part 31 from the transverse rail 2. Therefore, when a rail for the shift to the contiguous traveling passage on the floor 1 of an embedded field, a bridge-shaped crane can be transferred to the contiguous traveling passage, placing the dolly part 31 onto the rail.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a leg structure for a bridge crane that can change its travel path.

[Prior Art] Generally, a bridge crane is constructed by installing a crane girder with a hanging device on the upper end of a pair of tall legs that are capable of running in the same direction across a work area. The legs are configured to run along rails laid on the floor of the workplace.

Incidentally, bridge cranes such as those described above are also used at burial sites for low-level radioactive waste. On the floor of a low-level radioactive waste dump, many parallel rails are laid, and between each rail there are many concrete sections placed in rows and columns. In such burial sites, bridge cranes are used to store drums filled with low-level radioactive waste into the respective compartments.

[Problems to be Solved by the Invention] However, in a low-level radioactive waste burial site such as the one mentioned above, if drums are stored in all the compartments between certain rails, the bridge crane must be moved to the next lane. It won't happen.

In the past, since the need to move a bridge crane occurred only once every few months, the bridge crane had to be dismantled and reassembled on the adjacent road each time. However, dismantling and reassembling bridge cranes, even once every few months, requires a large amount of manpower and equipment, which makes the cost of burying low-level radioactive waste relatively high. was there.

[Objective of the Invention] This invention was made in view of the above circumstances, and an object of the present invention is to provide a leg structure (hereinafter abbreviated as leg structure) for a bridge crane that can easily change the traveling route. It is an object.

[Means for Solving the Problem] The leg structure of the present invention includes a leg that can run along a track, a leg that extends in the vertical direction, and a lower end of the leg that runs along the track. A pair of trolley parts are provided spaced apart from each other in the direction and are rotatable about a rotation center line pointing in the vertical direction, and a pair of truck parts are provided on the pedestal part, and the lower end pushes the track or the floor to rotate the pedestal part and the pillar part. The structure includes a push-up mechanism that lifts up the truck section.

[Function] In the leg structure having the above configuration, each of the carriage parts can be rotated by 90 degrees by lifting the pillar part and the carriage part and thereby lifting the carriage part from the track. Therefore, if rails are laid on the floor of the burial site for moving to the next lane, the bridge crane can be used by placing the truck on the rails and moving the crane to the next lane.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. Figures 5 to 7 are diagrams showing a bridge crane A using the leg structure of the embodiment, and Figure 4 is a plan view showing a burial site for low-level radioactive waste where the bridge crane A is used. It is a diagram. Here, prior to describing the embodiment, the general configuration of the burial site and the bridge crane A will be described.

Reference numeral 1 in Fig. 4 is a floor, and the floor l has a plurality of rails (hereinafter referred to as horizontal rails) whose longitudinal direction is oriented in the left and right directions in the figure.
2... are laid parallel to each other and spaced apart from each other, and buried equipment groups 3a to 3h are provided between the horizontal rails 2 and 2, respectively. The burial site shown in Figure 4 is located on a slope, and the floor heights of the buried equipment groups 3a to 3h are gradually lowered from the top to the bottom in the figure. ing. And each buried equipment group 3a...
is divided into five sections, and each of the five sections has a concrete section 4 divided into 16 rooms. In addition, buried equipment groups 3b, 3cs 3d, 3
Passages 5 are provided between e, 3f, and 3g, respectively, through which transport vehicles carrying drums to the burial site pass.

In addition, at the right end of the burial site, there are 2 rails perpendicular to the horizontal rail 2...
Book rails (hereinafter referred to as vertical rails) 6.6 have been laid. This vertical rail 6 is provided to be inclined according to the slope of the ground of the burial site.

On the other hand, the bridge crane A is mounted on two horizontal rails 2, 2, and is capable of running in left and right directions. As shown in FIG. 6, the bridge crane A is constructed by attaching a crane girder 8 whose longitudinal direction is oriented in a direction substantially perpendicular to the horizontal rail 2 to the upper ends of the pair of legs 7, 7. ing. The crane girder 8 has a rectangular frame shape in plan view, and on its upper surface, a trolley 9 that can run in the longitudinal direction of the crane girder 8 is supported by two rails 10.

As shown in FIG. 7, the trolley 9 includes a base 11 and a slide 12 that is movable in the left and right directions in the figure with respect to the base 11.
and a table 13 rotatably attached to the slide 12 around a vertical line. Two winding rollers 14 are attached to the table 13. Wires 15 are wound around the winding roller 14, and hanging tools 16 are attached to the wires 15.

The hanging tool 16 has eight pairs of claws 17 that can be opened and closed integrally.
is installed, and 8 drums 18...
・It is designed to lift. Further, a telescopic mast 19 is connected to the upper end of the hanging tool 16. The mast 19 is made by sequentially fitting cylindrical bodies of different sizes to each other, and prevents the hanging tool 16 from swinging. In addition,
Reference numeral 20 in the figure is an operation room.

Next, the structure of the leg portion 7 according to the embodiment of the present invention will be described in detail. Reference numeral 30 in FIG. 7 is a pillar portion. The pillar part 30 has a substantially U-shape with an open upper part, and a cart part 31 is attached to the lower end surface of the pillar part 30 and spaced apart from each other in the left-right direction.

FIG. 1 shows the details of the truck part 31, and the reference numeral 32 in the figure shows the details of the truck part 31.
is a pedestal. Two wheels 33, 33 spaced apart from each other in the left-right direction are rotatably attached to the pedestal 32. These wheels 33 are rotatable by a motor 34, a reducer 35, and a gear 36 attached to the upper surface of the truck 32. In addition, the code|symbol 37 is a brake. Further, a stopper 38 is attached to the pedestal 32. The stopper 38 includes an arm 38a whose intermediate portion is rotatably supported, and a locking member 38b rotatably connected to the distal end of the arm 38a.

Furthermore, a tongue piece 39 is formed at the upper end of the pedestal 32 and projects upward. A pedestal 40 is rotatably connected to the tongue piece 39 via pins 41. On the other hand, a bracket 42 is attached to the pillar section 30. The pedestal section 30 is supported with its bracket 42 placed on the upper surface of the pedestal 40, and the truck section 31 is connected to the bracket 42 so as to be freely rotatable around a vertical line.

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

On the other hand, a cylindrical body 55 penetrated by a hydraulic jack 50 is fixed to the pedestal 40 of the truck portion 31. A slight gap T is provided between the lower end surface of the cylindrical body 55 and the thrust bearing 54.

Based on this configuration, the cart portion 31 is movable relative to the pillar portion 30 in the vertical direction by the gap T, and
Relative rotation is possible. In addition, the 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 storing the drums 18 in the compartments 4 by using the bridge crane A using the leg structure configured as described above will be described.

First, the drum can 18... is a transport vehicle 60 (see Fig. 6).
is carried into the passageway 5 of the burial site. Further, the trolley 9 of the bridge crane A has moved to above the transport vehicle 60. Next, the lifting rollers 14 are rotated to
6 is lowered to a predetermined position, and the drums 18 are gripped by the claws 17. In this case, the hanging tool 1
6 is lowered by the mast 19 without swinging. Also, the posture of the drum can 18... may be tilted, or the drum can 18... may be tilted.
... and the hanging tool 16 may be slightly misaligned, so do not rotate the table 13 or move the slide 12.
The position of the hanger 16 is finely adjusted by moving the .

Then, the gripped drums 18 are stored in the compartment 4, and when the compartment 4 is full, the lid 61 is closed.

This lid 61 is also transported by the bridge crane A.

Next, for example, a procedure for moving the bridge crane A to the buried equipment group 3b when all the compartments 4 of the buried equipment group 3a have also housed the drums 18 will be described.

First, move the bridge crane A to the right end in FIG.

At this time, the bridge crane A has wheels 33 and
. . are positioned so that their respective centers are located at the intersections of the horizontal rails 2 and the porcelain rails 6.

Next, hydraulic oil is supplied to the hydraulic jack 50, and the piston 5
1 is the extended state. Then, the pusher 53 presses the horizontal rail 2, and first, only the pillar portion 30 is lifted up with the truck portion 31 remaining on the horizontal rail 2. As a result, the bracket 42 of the pillar section 30 and the pedestal 40 of the truck section 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, and the truck section 31 is also lifted.

As a result, the truck portion 31 is supported by the thrust bearing 54, and is rotatable about its axis. Then, when the wheel 33 and the horizontal rail 2 are separated and their engagement is released, the truck portion 31 is manually rotated by 90 degrees, and in this state, the piston 51 is brought into a contracted state. Then, the truck portion 31 is lowered and its wheels 33 are placed on the vertical rail 6. Next, the horizontal crane A is moved to the buried equipment group 3b, and the trolley portion 31 is rotated 90 degrees by the same procedure as above, and the movement of the bridge crane A is completed.

In the horizontal crane A using the leg structure having the above configuration, the bogie section is lifted off the horizontal rail 2 by lifting the column section 30 and the bogie section 31, thereby making the bogie section 31 rotatable. , burial ground floor
Just by laying the vertical rail 6 in the adjacent buried equipment group 3b
You can easily move to... Therefore, there is no need for disassembling and assembling the bridge crane A, which was conventionally performed, and the cost of burying low-level radioactive waste can be significantly reduced.

Moreover, in the above-mentioned leg structure, by lifting both the column part 30 and the truck part 31 with the hydraulic jack 50,
Since the truck portion 31 is supported by the thrust bearing 54, the truck portion 31 can be easily rotated manually, and the structure thereof can therefore be simplified.

In the above embodiment, the hydraulic jack 50 (which pushes the horizontal rail 2) is configured, but it may also push the floor l.Also, the so-called push-up mechanism uses the hydraulic jack 50 as described above. The number is not limited to 50, and various types such as a screw type may be applied.Furthermore, in the above embodiment,
The trolley part 311 has two wheels 33, 33,
Of course, even if there is only one, the same effect can be achieved.

[Effects of the Invention] As explained above, in the leg structure of the present invention, the legs that can run along the track include a leg column that extends in the vertical direction, and the lower end of the column that extends in the direction along the track. are provided at a distance from each other and are rotatable about a rotation center line pointing in the vertical direction; provided on a pair of truck parts and a pedestal part, and the lower end pushes against the track or floor to rotate the pedestal part and the pillar part. Since it is equipped with a push-up mechanism that lifts up the truck, the horizontal crane can be easily moved by simply providing a track on the floor of the burial site to move to the next running path. Therefore, there is no need for any conventional dismantling and assembly work of bridge cranes, and it is possible to significantly reduce the cost of burying low-level radioactive waste.

[Brief explanation of the drawing]

Figures 1 to 7 are views showing one embodiment of the present invention, in which Figure 1 is a side view showing the leg structure, Figure 2 is a side sectional view showing the inside of the truck, and Figure @3. Figure 4 is a plan view showing a burial site for low-level radioactive waste, Figure 5 is a plan view showing a bridge crane, and Figure 6 is a cross-sectional view along the line ■-■ in Figure 2.
7 is an enlarged view of FIG. 5 as viewed from the ■ direction. 1...Floor, 2...Horizontal rail (track),
7... Legs, 8... Crane girder, 30
...Pillar section, 31...Dolly section, 50.
...Hydraulic jack (push-up mechanism).

Claims (1)

[Claims] The structure of the legs of a bridge crane includes a crane girder whose longitudinal direction is substantially perpendicular to the track, installed at the upper end of a pair of legs that can travel along a track, the legs a pedestal section extending in the direction; and a pair of cart sections provided at the lower end of the pedestal section spaced apart from each other in the direction along the track and each rotatable about a rotation center line pointing in the vertical direction. A bridge crane leg structure comprising: a push-up mechanism provided on the pedestal section, the lower end of which pushes the track or floor to lift the pedestal section and the truck section.