JPH0512120B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for cutting and demolishing concrete structures and the like by injecting high-pressure water mixed with an abrasive material from a nozzle.

[Technical Background and Prior Art] Several techniques have been developed for dismantling concrete structures. To dismantle concrete structures that house nuclear reactor pressure vessels, it is necessary to proceed with remote concrete work because the concrete is radioactive.

It is also required to cut and dismantle the radioactive concrete without scattering it. The present applicant has developed a technique for cutting concrete by spraying high-pressure water mixed with an abrasive material from a nozzle as a method for cutting such concrete structures, and has already filed an application.

When this water jet cutting method is used to cut the concrete wall surface of a concrete structure from the inside using its cavity, a device is required to carry out the cut blocks. The water jet nozzle rotates 360 degrees inside the cavity, so
The positional relationship and operation method between the cutting device equipped with this water jet nozzle and the device for receiving and transporting the cutting block have become difficult issues.

Techniques for cutting articles using an abrasive jet are generally known.
Japanese Patent No. 127894 discloses a technique in which a cutting device having a fixing means is introduced inside the pipe and the jet nozzle is rotated to cut the pipe. However, such cutting techniques cannot transport cut blocks such as concrete structures.

[Problems to be Solved] Therefore, it is an object of the present invention to provide a water jet demolition device that can easily cut concrete structures having cavities into blocks and easily dismantle them.

[Means for Solving the Problems] According to the present invention, in a water jet demolition device that sprays high-pressure water mixed with an abrasive material from a nozzle to cut and demolish a concrete structure having a cavity, etc., the water jet dismantling device runs above the cavity 2. A support lifting device 10 that can move on a rail 12 is provided, and a lifting drive device 1 provided on the support lifting device 10.
A wire 15 suspended vertically at 3 extends into the cavity 2 and connects to the water jet cutting device 30.
The main body 31 of the water jet cutting device 30 is provided with a fixing device 32' having a rigger 33 that projects radially outward and presses against the side wall of the cavity 2. is rotatably supported by a support device 39 and the drive device 3
An outer cylindrical body 38 is provided which is rotatably driven by a cylindrical member 5, and has an inner cylindrical body 42 supported in the outer cylindrical body 38 so as to be freely raised and lowered by a lifting device 40.
A water jet nozzle 50 is installed in the inner cylindrical body 42 via a telescoping device 52, and an unloading bucket drive device 65 is installed on a revolving frame 70 that rotates on a rail 71 provided at the upper part of the cavity 2.
A block unloading bucket cart 60 is supported by a wire 67 extending into the cavity 2 from the unloading bucket drive device.

[Description of Functions and Effects] Therefore, the water jet cutting device 30 suspended via the wire 15 by the lifting drive device 13 is fixed at a predetermined position by the fixing device 32, and the inner cylindrical body 42 is fixed to the lifting device 40. and drive device 35
The water jet nozzle 50 is moved to a predetermined position by the , and the water jet nozzle 50 is expanded and contracted to a predetermined position in the radial direction by the expansion and contraction device 52 to perform the cutting operation. The cut blocks fall into a block transport bucket 60.

As the work progresses, the angular position of the block to be cut changes, but the block transport bucket 60
The angular position of can also be followed by the pivoting frame 70. When the wire 67 and the rigger 33 are buffered, the rigger 33 may be contracted. Blocks cut in this manner can be easily carried out, and work efficiency is therefore improved, making them suitable for dismantling large concrete structures having cavities.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an overall outline of the water jet demolition apparatus of the present invention, in which a support and lifting device 10 is provided directly above a cylindrical cavity 2 of a structure 1 to be demolished. This support and lifting device 10 has a gate-shaped frame 11 and is movable on traveling rails 12. The frame 11 also has an elevating drive device 13, and a water jet cutting device, generally designated by the reference numeral 30, is suspended in the cavity 2 by three wires 15.

The lifting wire 15 of this cutting device is extended over a lifting fine adjustment device 16, so that the attitude of the cutting device 30 can be finely adjusted.

The cutting device 30 includes six fixing devices 32 on the top of the main body 31. Each of the fixing devices 32 has a retractable rigger 33, and the cutting device 30 is fixed by protruding the rigger 33 and pressing it against the side wall of the cavity 2. The mechanism of the cutting device 30 is shown in detail in FIG. 2, in which an external cylindrical body 38 is disposed within the main body 31 and is rotatably supported by a support device 39. This external cylindrical body 38 is rotationally driven by a drive device 35 via a gear mechanism.

Inside this cylindrical body 38 is an internal cylindrical body 42.
It is supported by a lifting device 40 so that it can be raised and lowered. A water jet nozzle 50 is attached to the lower part of the inner cylindrical body 42 so as to be extendable and retractable by means of a telescoping device 52. High pressure water is sent to this water jet nozzle 50 via a high pressure hose 18. High-pressure water of a maximum of 2000 Kgf/cm ² is supplied to this high-pressure hose from a high-pressure pump (not shown), and this high-pressure water is mixed with abrasive materials such as sand and steel balls. An abrasive secondary tank 36 is also installed at the top of the cutting device 30, and the high-pressure water mixed with these abrasive materials is injected from a water jet nozzle 50 to cut out the concrete wall of the side wall of the cavity 2 into blocks 5. .

The cut block 5 falls downward, and is received by a block carrying bucket 60 arranged below. This bucket cart 60 is supported by an unloading bucket cart drive device 65 via a support plate 61 and two wires 62 . The unloading bucket drive device 65 is
It is mounted on a slide 66 on the rotating frame 70 and is movable. This rotating frame 70 can pivot on rails 71.
If the rigger of the cutting device interferes with the wire during turning, it is sufficient to retract only that rigger and allow the wire to pass through. A protective rod 64 is interposed at the joint between the bucket lift wire 62 and the support plate 61 to prevent the wire 62 from being damaged by flying abrasive jets. Bucket 6
0 is lowered downward after receiving the cutting block 5, loosens one of the wires 62, and overturns the bucket cart 60 within the block carrying cart 80.

As a result, the cutting block 5 is packed into the truck 80, and the truck 80 is slid to move the truck to the outside of the structure 1. Thereafter, the cutting block 5 is gripped by the block gripping device 85 and stored in a storage container or the like.

According to the above process, even when cutting radioactive concrete such as the containment vessel of a nuclear reactor, the work stage is used for nozzle replacement or maintenance, and the remote control of the cutting work is , controlled from a control panel from another room. Therefore, work safety can be ensured.

[Effects of the Invention] As described above, the present invention provides the following excellent effects.

(i) Since the water jet nozzle can be moved, expanded and contracted while the main body of the water jet cutting device is fixed with a fixing device, there is no need to frequently expand and contract the rigger.

(ii) Since the cut blocks are placed in the block transport bucket by gravity, the work of transporting the blocks is easy.

(iii) The block transport bucket can be easily followed by the revolving frame.

(iv) Cut blocks can be easily transported, improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the overall configuration of the disassembling device of the present invention, FIG. 2 is a sectional view showing details of the cutting device, and FIG. 3 is a view taken along the line A--A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Structure, 2... Cavity, 5... Cutting block, 10... Supporting and lifting device, 15... Wire, 30... Cutting device, 32... Fixing device, 33
... Rigger, 50 ... Water jet nozzle, 60 ...
... Carrying out bucket, 62... Wire, 64... Protection rod, 80... Block carrying cart.

Claims (1)

[Claims] 1 In a water jet demolition device for cutting and demolishing a concrete structure having a cavity by spraying high-pressure water mixed with an abrasive material from a nozzle, a support and lifting device 10 that can move on a traveling rail 12 is installed above the cavity 2. A wire 15 is suspended from the cavity 2 so that it can be raised and lowered by a lifting drive device 13 provided in the support and lifting device 10.
The main body 31 of the water jet cutting device 30 has a main body 31 extending therein to support the water jet cutting device 30.
A fixing device 32' having a rigger 33 that projects radially outward and comes into pressure contact with the side wall of the cavity 2 is provided, and is rotatably supported in the main body 31 by a support device 39 and driven by a drive device 35. An external cylindrical body 38 that is driven to rotate is provided, and has an internal cylindrical body 42 that is supported in the external cylindrical body 38 so as to be able to rise and fall freely by an elevating device 40. A water jet nozzle 50 is provided through the rotary frame 70, which rotates on a rail 71 provided at the upper part of the gear cavity 2, and an unloading bucket drive device 65 is installed, and a wire 6 extending from the unloading bucket drive device into the cavity 2 is provided.
A water jet dismantling device characterized in that a block carrying bucket 60 is supported at 7.