JPS6216997A - Rotary travelling crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a crane that rotates at a work site and performs work such as lifting.

``Prior art'' For example, when dismantling a nuclear reactor, it is conceivable to cut the cylindrical reactor shielding wall into small blocks from the inside using a cutting machine, and then transport the blocks to the outside using a gripping device. ing. To carry out such demolition work,
A crane is required to suspend the cutting machine from the top of the reactor, and a crane is required for the gripping device.

Of these two cranes, the one for the cutting machine is
It is sufficient to use a cutting machine that can move the cutting machine horizontally and vertically to place it in a predetermined position inside the reactor, but the crane for the gripping device needs to cover the entire annular area at the top of the shielding wall. It is being considered to use a crane that swings over the top of the shielding wall.

As such a swing traveling crane, for example, those shown in FIGS. 4 to 7 may be considered.

In the system shown in Figures 4 and 5, an annular rail C is laid around the outer periphery of an annular part b above the shielding wall a (i.e., the working area of this crane), and a gate-shaped structure is installed on the rail C. The crane d is rotated, and the trolley hoist g is moved along the crossbeam ``crossing over the opening e in the center of the shielding wall a (i.e., the working area of the cutting machine). .

In addition, in the case shown in FIGS. 6 and 7, ring-shaped rails h and i are provided twice above the shielding wall a, and a trolley hoist j is suspended between the rails h and i. is moved along rails h and i.

``Problems to be Solved by the Invention'' However, the above-mentioned swing traveling cranes all have the following problems. That is, in the recessed crane shown in FIGS. 4 and 5, the crossbeam f is connected to the shielding wall a.
Since the rack is placed across the opening e, it is not possible to insert or remove the cutting machine into or out of the opening e. In this case, although the upper part of the opening e is open, the ring-shaped rails h and i get in the way of the horizontal movement of the cutting machine.

For these reasons, the above-mentioned swing traveling crane is
None of them can be used as a gripping device, and a crane that can be used in such cases has been desired.

Note that this applies not only to nuclear reactor dismantling work, but also to
This is a problem that can occur in general operations such as when multiple cranes are used.

This invention was made in view of the above circumstances, and in particular, two
The purpose of this invention is to provide a lane where both cranes can be operated freely without interfering with each other by using it for one side when two cranes are operated at the same time.

``Means for Solving the Problems'' The present invention is a crane with a gate-type structure that rotates in a working place B in a circular area surrounding firewood A in a predetermined area and performs work such as lifting. An annular rail laid on the outer periphery of the working place B, a pedestal movable on the annular rail, and a pedestal extending in a direction intersecting the radial direction of the annular working place B, on the pedestal. , a crossbeam installed across the top of the work area B, a rail for running a trolley hoist attached to the crossbeam so as to intersect with the crossbeam and extending horizontally, and a rail for running the trolley hoist. A trolley hoist is attached to a rail for use in a manner movable in the axial direction of the rail, and the pedestal and the crossbeam are arranged outside the work area A in plan view. .

The trolley hoist running rail attached to the cross beam may be movable in its axial direction.

"Function" The slewing traveling crane of the present invention has a gate-type structure, and the crossbeam passes through the outside of the work place A, so that the crane can work at the work place A and work at the work place by this crane. Work at B will not interfere.

"Embodiments" Examples of the present invention will be described below with reference to FIGS. 1 to 3.

1 of these drawings shows a case in which the swing traveling crane C of this embodiment is used for dismantling a shielding wall of a nuclear reactor.

First, we will briefly explain the procedure for this disassembly work. In the figure, reference numeral l is a cylindrical reactor shielding wall, and 2 is an opening in the center of the shielding wall l. Inside this opening 2,
Although not shown, a cutting machine is suspended by a crane and cuts the concrete forming the shielding wall l into small blocks from inside the opening 2. Then, the cut blocks are gripped by a gripping device (not shown) operated by crane C and transported out of the furnace. This process is performed all around the shielding wall 1 and sequentially toward the bottom of the shielding wall 1, thereby dismantling the entire nuclear reactor.

In this way, this demolition work requires two cranes,
A crane for a cutting machine (not shown) works inside the opening 2, and a crane C for a gripping device works in an annular area on the outer circumferential side of the opening 2. In the figure, reference numeral A indicates the working place of the crane for the cutting machine, and reference numeral B indicates the working place of the crane C for the gripping device.

Next, the configuration of the swing traveling crane C used for the above demolition work will be explained.

An annular rail 3 is laid around the outer periphery of the work area B, and a pedestal 4 is configured to rotate on this rail 3. The pedestal 4 has a bottom leg 5 set in a shape that roughly follows the rail 3 and spans about three-quarters of the length of the rail 3, and a pair of vertical legs 6 whose lower ends are each fixed to the bottom leg 5. , 6, a pair of front legs 7.7, a pair of horizontal legs 8.8, which are fixed at an angle, and vertical legs 6, 6, and front legs 7, 7.
, are assembled by connecting beams 9.9 that connect the upper ends of the transverse legs 8.8. Furthermore, rollers 10 are attached to the lower portions of the bottom legs 5 of the pedestal 4, and the pedestal 4 is enabled to run on the rails 3 by a motor 11 that rotationally drives the rollers 1O. Note that a counterweight 12° 12 is attached to the tip of the bottom leg 5.

A pair of cross beams 13.13 extend parallel to each other between both ends of the connecting beams 9.9 of the frame 4. These cross beams 13, 13 extend above the annular work place B in a direction orthogonal to the radial direction of the annular work place B, straddle the work place B, and extend outside the work place A in a plan view (see FIG. 1). It is made to pass through.

The gantry 4 and the crossbeams 13, 13 described above constitute a gate-shaped frame of this crane C.

As shown in FIG. 1, this frame is assembled within the range of the work place B in plan view, and is arranged so as not to overlap with the opening 2 of the shielding wall I, that is, the range of the work place A. In addition, the side part (the left side in FIG. 1) of the work place B is open.

A pair of parallel trolley hoist running rails 14.14 are attached to the cross beams 13,13. This rail 14.14 extends horizontally and in a direction perpendicular to the crossbeam 13.13, and has motors 15... and rollers 16.
The rail 14 is supported by the cross beams 13, 13 so as to be movable in the axial direction of the rail 14. When the trolley hoist travel rail 14.14 is moved in one direction, it straddles the outside of the annular rail 3 from above the work area B, as shown in FIGS. 1 and 3, and when it is moved in the other direction, , as shown by the two-dot chain line in Figures 1 and 3,
It is arranged to extend from above work place A to above work place B.

A trolley hoist 17 is attached to this trolley hoist running rail 14.14 so as to be movable in the axial direction of the rail 14.14. This trolley hoist I
Reference numeral 7 includes a drive source for self-propulsion and a drive source for raising and lowering the hook 18, which is commonly used in the past.

This crane C configured as described above is used for dismantling a nuclear reactor by attaching a gripping device (not shown) to the hook 18 of the trolley hoist 17.

Thereby, this crane C can swing around on the rail 3 and can grip and carry out blocks cut by a cutting machine (not shown) over the entire circumference of the shielding wall l, that is, over the entire working area B.

According to this crane C, since the crossbeam 13 does not straddle the upper part of the work place A, it does not impede the vertical movement of the cutting machine when it is taken in and out of the reactor.

Furthermore, since the sides of the work area B are always open, there is no obstruction to the horizontal movement of the cutting machine. Therefore, by using Crane C, two cranes can be operated simultaneously without interference, making it possible to dismantle nuclear reactors using cutting machines and gripping devices, which was previously difficult. becomes possible.

In addition, trolley hoist running rail I4. 4 is movable with respect to the crossbeams 13, 13, so the working range of this crane C is expanded and can be used for tasks such as loading and unloading materials to and from work site A (inside opening 2). can also be used and is effective in this respect.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment; for example,
The shape of the pedestal, etc. can be changed as appropriate.

Further, the trolley hoist running rail is not necessarily movable relative to the crossbeam, and may be fixed at a position that does not overlap with the upper part of the work area A. Alternatively, the rail may also rotate in a horizontal plane with respect to the crossbeam.

This invention is not only used for nuclear reactor dismantling work, but also
Of course, it can be used for work on well-like structures similar to nuclear reactors, for all work performed by operating multiple cranes at the same time, and for all work performed by conventional swinging cranes.

``Effects of the Invention j'' As explained in detail above, according to the present invention, the crossbeam is configured to pass through the outside of the work place A in plan view where other cranes etc. work, so that This has the effect of preventing the work performed by the crane from interfering with each other, making it possible to perform work that was previously difficult.

Furthermore, if the trolley hoist running rail is movably attached to the crossbeam, the working range of this crane can be expanded and the work can be carried out more efficiently.

[Brief explanation of the drawing]

1 to 3 are views showing an embodiment of the present invention, in which FIG. 1 is a plan view, FIG. 2 is a front view, and FIG. 3 is a side view. Figures 4 to 7 are diagrams showing conventional swing traveling cranes. Figure 4 is a side view of a conventional portal crane, and Figure 5 is a side view of a conventional portal crane.
The figure is a plan view thereof, FIG. 6 is a side view of a conventional ring frame traveling crane, and FIG. 7 is a plan view thereof. A...Working place A, B...Working place B
, 3... Inner annular rail, 4... Frame, 13...
...... Cross beam, 14 ... Trolley hoist running rail, 17 ... Trolley hoist. Figure 1 Figure 3 To q 1 Figure 4 Figure 5 Figure 6 Figure 7

Claims (2)

[Claims] (1) A crane with a gate-shaped structure that performs work such as lifting by circling in a circular area of a working area B surrounding a predetermined area of a working area A, and is installed on the outer periphery of the working area B. a ring-shaped rail, a pedestal movable on the annular rail, and a pedestal provided on the pedestal, extending in a direction intersecting the radial direction of the annular work place B and straddling the upper part of the work place B. A trolley hoist running rail attached to the cross girder that intersects with the cross girder and extends horizontally, and a trolley hoist running rail that moves in the axial direction of the rail. A swing traveling crane, characterized in that it is provided with a trolley hoist that can be attached, and that the pedestal and the crossbeam are arranged outside the working area A in plan view. (2) The swing traveling crane according to claim 1, wherein the trolley hoist traveling rail attached to the cross beam is movable in its axial direction.