JPH0722759B2 - Slurry processing equipment for cutting and dismantling equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for collecting and processing a slurry generated when a structure is cut and disassembled by an abrasive jet cutting means.

[Technical background and prior art] For example, when dismantling an ultra-high chimney, or dismantling or reforming a pier, it is desirable to minimize the dispersal of demolition fragments and dust and noise generated during work, and radioactive materials. In a hazardous material storage facility that stores hazardous substances such as, the prevention of dispersal of debris and dust contaminated with harmful substances and the remote control of work are particularly important issues.

In general, the method of crushing concrete structures with a pneumatic rock crusher, hydraulic crusher, etc. is adopted, but it is difficult to prevent scattering of cut pieces and dust and noise with either method. Also, it is difficult to apply it to a narrow space.
In the abrasive jet cutting, an abrasive material such as steel grid or sand is mixed in ultra-high pressure water, and cutting is performed by this jet jet.

According to this cutting means, a large amount of slurry containing abrasive jet water and cutting powder flows out from the cutting place.
If the structure is a demolition of a hazardous material storage facility, it is necessary to safely handle the slurry.

In order to respond to this, for example, in the technology described in Japanese Patent Laid-Open No. 60-238573, a slurry containing an abrasive jet and cutting powder is received in a container equipped with a screen, and the powder of metal pieces, concrete pieces, etc. is screened by the screen. Although the granules and the drainage are separated, the publication does not disclose any subsequent treatment of the powder and the drainage. Further, in the technique described in JP-A-60-226970, a slurry prepared by mixing an abrasive jet and cutting powder is separated into shots and cutting pieces and jet water by a separator, and a next separator. Although it is separated into shots and cutting pieces, and jet water is separated into solid and liquid by a settling container,
Shot (abrasive material) drying, slurry concentration,
Dehydration is not done in particular, and there are problems in terms of transportation of slurry and reuse of shots.

[Problems to be Solved by the Invention] Therefore, the present invention not only separates the slurry generated by the abrasive jet cutting into the abrasive material, the cutting powder, and the water, but also reuses the abrasive material by drying. The purpose of the present invention is to provide a slurry processing device capable of concentrating and dehydrating cutting powder to facilitate transportation such as transportation. It is also an object of the present invention to make it possible to transport the pipe without any trouble and to reliably separate the abrasive material and the cutting powder.

[Means for Solving the Problems] Therefore, according to the present invention, in a slurry processing apparatus of an apparatus for cutting and disassembling a structure using an abrasive jet cutting means, a slurry recovery apparatus arranged below the cutting apparatus. An abrasive material separating device for separating the abrasive material from the slurry, an apparatus for drying the separated abrasive material, and an apparatus for concentrating and dehydrating the remaining slurry,
It comprises a device for clarifying the dehydrated filtrate, the slurry recovery device is provided with a slurry take-out port at the lower end, an inverted cone-shaped slurry recovery pan provided with a supernatant take-out port for water jet at the top, respectively. There is provided a slurry processing device of a cutting and disassembling device in which a water jet is jetted into a slurry outlet to impart fluidity to the slurry.

[Operation] The slurry generated by the abrasive jet cutting is
Prevents scattered pieces and dust from being scattered and received by the slurry recovery device. Then, the abrasive material is separated from the slurry by an abrasive material separating device, and the abrasive material is dried by a drying device and reused. The remaining slurry is concentrated and dehydrated into a dehydrated cake, and the dehydrated filtrate is refined into a clarified water. In the slurry recovery device,
A jet of water is jetted into the slurry outlet to give fluidity to the slurry, the slurry can be transported by piping without hindrance, and the abrasive material and the cutting powder can be reliably separated.

EXAMPLES The present invention will be described below with reference to the drawings.

FIG. 1 shows the entire structure of a dismantling device of a dangerous substance storage facility to which the dismantling block transfer device of the present invention is applied. In the dangerous substance storage facility 1, a concrete structure 2 supports a storage container. A space 3 is formed, and a work plane 4 is formed on the upper surface of the structure. When dismantling a hazardous material storage facility, first, a storage container (not shown) is removed. Concrete structure 2 after removing the storage container
Although the cylindrical space 3 remains, the inner wall portion 5 around the cylindrical space 3 has a contaminated area in a cylindrical shape.

When dismantling this area, no worker can enter, so it is necessary to dismantle and carry out the concrete structure by remote control, and the control device 7 in the central cab is used for remote control.

As an apparatus for disassembling this structure, in the present invention, an abrasive jet cutting device is used, and concrete pieces cut out in a block shape by the cutting device are received by a carry-out device arranged below the cutting device, and the concrete piece is received. It is lifted up and carried out and transferred. That is,
In the space 3 after removing the storage container, a support lifting device 8 that moves on a rail laid on the upper surface 4 of the structure is provided, and from this support lifting device 8 a cutting device 9 using a wire. The block unloading device 10 is suspended.

Next, the cutting means applied to this cutting device will be described.

As a method of cutting this kind of concrete structure, it is indispensable to be able to operate remotely in order to avoid contamination, and it is necessary to take measures such as preventing scattering of generated dust. For this purpose, a controlled blasting method using explosives, an abrasive jet cutting method using a diamond cutter or a core boring machine, and the like have been developed. In this embodiment, the abrasive jet cutting method is adopted.

The equipment used for this abrasive jet cutting method is
As shown in FIG. 2, a mixing chamber 21 is attached to the tip of a water nozzle 25 communicating with a high pressure water pump. An abrasive material 23 is supplied to the mixing chamber 21, and the abrasive material 23 is made of sand, steel balls or the like. The high-pressure water mixed with the abrasive material in the mixing chamber 21 is jetted as a jet stream from the abrasive nozzle 22 at the tip, and easily cuts reinforced concrete and the like.

In the device of the present invention, the abrasive jet nozzle 22 described above is mounted on the cutting device 9 to form a cutting machine. The details of the cutting device 9 are as shown in FIG. 3 and FIG. 4, and the device indicated by reference numeral 9 has a gantry 40, and three gantry fixing devices 41 are provided on this gantry. ing. This fixing device 41 has telescopic legs 42,
The pedestal 40 is fixed to the inner wall of the structure by protruding 42.
A rail 43 for cutting machine turning is provided on the front edge of the gantry 40, and the cutting machine 50 is turned along the rail by the turning device 44. The cutting machine 50 is also guided up and down by an elevating device 45 projecting below the gantry 40. A secondary tank 60 of an abrasive material, which will be described later, is attached to the frame 40. Therefore, the abrasive material from the abrasive material secondary tank 60 is supplied to the cutting machine 50 attached to the cutting device 11 together with the high pressure water, and the jet nozzle is supplied.
It is jetted from 22 to the structure 6 as an abrasive jet to cut the structure into blocks.

The cut block falls by its own weight, but this block is collected and carried out by the block carrying-out device suspended below the cutting device. High-pressure water is supplied to the cutting machine 50 from the water jet generator 14 installed in the high-pressure pump chamber 11 (Fig. 1). The abrasive material is the primary tank for the abrasive material provided on the upper surface 4 of the structure. 15 is supplied from the abrasive material secondary tank 60 on the cutting device 9 to the cutting machine.
Sent to 50. The abrasive jet water used for cutting is collected by a slurry collecting device 16 provided at the lower end of the space 3 as a slurry containing concrete chips and the like. The details of the slurry recovery device indicated by reference numeral 16 are the fifth
As shown in FIGS. 1-8, the apparatus includes an inverted conical slurry recovery pan 80. A slurry take-out port 81 is provided at the lower end of the recovery pan 80, and the recovered slurry is sent to a slurry processing device via a pipe 83.

On the other hand, in the upper part of the recovery pan 80, a supernatant liquid outlet 82 for water jet is provided to take out the supernatant liquid in the upper portion of the slurry. As shown in FIG. 8, the taken-out slurry supernatant liquid is pressurized by a pump 85 and sent from a circuit 86 to a water jet nozzle 87 provided at the bottom of the slurry take-out port 81 and jetted into the slurry take-out port 81. To give fluidity to the slurry.
The recovered slurry is sent to the slurry processing apparatus of the present invention via a pipe 83. As shown in FIG. 9, the slurry processing device is composed of various devices. This slurry processing device "reduces the range of contamination by by-products to a minimum," and "discards generated. It is planned mainly for the purpose of "volume reduction of goods". Each device of the slurry processing device is configured based on this premise, using a steel grid as an abrasive material,
The abrasive separating device 62 adopts a sedimentation separating type, and includes a propeller stirrer 63 and a spiral extruder 64. The separated abrasive material is transferred to the bucket conveyor.
After being sent to the upper part of the structure at 65 and dried by the abrasive material drying device 66, the abrasive material is sent to the primary tank 61 and reused. On the other hand, the slurry from which the abrasive material has been separated is sent to the concentration / dehydration device 68 via the conduit 67. The concentrating / dehydrating device 68 is a centrifugal separator, which separates the slurry into solids and liquids and separates solids into dehydrated cakes. The dewatered filtrate is sent to a clarification device 69, which uses a typical thickener device to clarify the filtrate and send the clarified water in circuit 70 to a wastewater treatment device.

A coagulant is fed from the dissolving device 71 to each device in order to accelerate the processing of these slurries.

[Advantage of the Invention] According to the present invention, in dismantling a concrete structure or the like, scattering of cut pieces and dust and noise are prevented as much as possible, and a slurry generated by the abrasive jet cutting is treated with an abrasive material and a cutting powder. In addition to separating and treating with water, the separated abrasive material can be dried for convenient reuse, and cutting powder can be concentrated and dehydrated to reduce the volume of waste generated as dehydrated cake. it can. Further, according to the present invention, by jetting a water jet into the slurry outlet of the slurry recovery device, fluidity is imparted to the slurry, the slurry is transported without hindrance, and the abrasive material and the cutting powder are reliably separated. be able to.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of a dangerous substance storage facility dismantling device to which the present invention is applied, FIG. 2 is an explanatory view of an abrasive jet nozzle, FIG. 3 is a front view of a cutting device, and FIG. 4 is a plan view. FIG. 5 is a front view of the slurry recovery device, FIG. 6 is a plan view, FIG. 7 is a detailed view of a slurry outlet, FIG. 8 is an explanatory view showing a mounting state of the slurry recovery device, and FIG. It is a conceptual diagram of a slurry processing apparatus. 1 ... Dangerous storage facility, 2 ... Structure, 3 ... Space, 7 ...
… Control device, 8 …… Supporting and lifting device, 9 …… Cutting device, 10 …… Block unloading device, 14 …… High pressure pump, 15 …… Abrasive material primary tank, 16 …… Slurry collecting device, 50 …… Cutting machine, 60 …… Abrasive material secondary tank, 62 …… Abrasive material separating device, 65 …… Bucket conveyor, 66 …… Drying device, 68 ……
Concentrating / dehydrating device, 69 ... Clarifying device 71 ... Flocculant dissolving device,
80 …… Slurry recovery pan, 81 …… Slurry outlet, 87…
… Water jet nozzle

Claims (1)

[Claims] 1. A slurry processing apparatus of an apparatus for cutting and dismantling a structure using an abrasive jet cutting means,
A slurry recovery device arranged below the cutting device, an abrasive material separating device for separating the abrasive material from the slurry, and an apparatus for drying the separated abrasive material,
It consists of a device for concentrating and dehydrating the remaining slurry and a device for clarifying the dehydrated filtrate. The above-mentioned slurry recovery device has a slurry outlet at the lower end and a supernatant liquid outlet for water jet at the upper part. A slurry processing apparatus for a cutting and disassembling apparatus, comprising a cone-shaped slurry recovery pan and ejecting a water jet into a slurry outlet to impart fluidity to the slurry.