JPH0768776B2 - Cutting and demolition equipment for cylindrical structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention disassembles a cylindrical structure such as a heat shield wall (RSW) of a boiling water type (BWR type) nuclear power plant by cutting it from the outer wall side. The present invention relates to a cutting dismantling device.

[Technical background and prior art] The major difference between the dismantling of such concrete structures and the dismantling of general structures is that they have been activated (change to new radioactive materials) and that they are contaminated with the activated materials. And the fact that there are many assimilar concrete structures with a large amount of reinforcing bars as a whole.

For this reason, since the worker cannot access the activated part, it is necessary to perform a dismantling process by remote control and to prevent scattered dismantled fragments and dust from scattering.

For this reason, Japanese Patent Application Laid-Open No. 62-107168 shows a technique of cutting a cylindrical structure into small blocks and lifting them to dismantle them. However, such a known technique is inefficient because the cylindrical structure is cut many times in the horizontal direction to form a small block regardless of the vertical direction.

[Problem to be Solved] Therefore, an object of the present invention is to provide a cutting and disassembling apparatus for a cylindrical structure, which can easily process the cylindrical structure even if it is cut into relatively large blocks. .

[Means for Solving the Problem] According to the present invention, in a cutting and disassembling apparatus for cutting and disassembling a cylindrical structure from the outer wall side, the jack (11) for pressing the cylindrical structure (1) over the upper end. Fixed to the guide frame (12) and the cover (1) that can move up and down along the guide rail (13) provided on the guide frame (12).
7) and a cylindrical structure located within its cover (1)
And a jet nozzle (18) for injecting an abrasive jet toward the center of the crane, the guide frame (12) being a wire (6) of a crane (5) provided in the building (4).
And a secondary block dismantling room (50) is provided on the traveling path of the crane (5) in the building (4),
A cutting device (51) and a crane (52) are provided in the secondary block dismantling chamber (50), and the primary block (1A) cut by the jet nozzle (18) is transferred to the secondary block dismantling chamber (50) in the secondary block dismantling chamber (50). It has a cutting device (51, 51a) for cutting into the next block (1B).

[Description of Action and Effect] Therefore, the cylindrical structure is cut into a length (dimension in the vertical direction) which is almost equal to the guide frame to form a primary block, which is directly conveyed to the secondary block dismantling chamber by a crane. Then, in the secondary block dismantling room, it is cut into small blocks.

As described above, by making the primary block relatively large, the length of the cutting line is shortened as a whole, and the cutting work efficiency of the cylindrical structure which is relatively difficult to cut is improved. And since the primary block carried to the secondary block dismantling chamber has a columnar shape, if this is cut by a cutting device in the longitudinal direction,
It can be dismantled into a small secondary block that can be placed in a container. Therefore, the secondary block may be placed in the container by a crane.

As described above, according to the present invention, the primary block is relatively largely cut, and the secondary block is disassembled in the secondary block dismantling chamber that is easy to perform the cutting process, so that the work efficiency is improved and the cutting and dismantling work by the automatic device is safely performed. It can be carried out.

[Preferred Embodiment] In carrying out the present invention, it is preferable to use a treatment apparatus for slurry and exhaust gas. By doing so, it is possible to prevent the scattered dismantled pieces and dust from scattering.

In carrying out the present invention, the subdivision into secondary blocks is
It is preferable to use an abrasive jet or a diamond wire.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a case where the cutting and disassembling method of the present invention is applied to a heat shield wall (hereinafter referred to as RSW) 1 of a BWR type nuclear power plant, for example.

In the figure, RSW1 has a diameter of about 10 m, a height of about 13 m, and a thickness of about 60 cm.
This is a cylindrical steel structure consisting of inner and outer surface shells made of thick steel plate with a thickness of about 30-45 cm and a partition plate between the shells, filled with concrete or mortar, and covered with a biological shielding wall (BSW) 2. It is stored in the Reactor Containment Vessel (PCV) 3.

A cutting and disassembling apparatus using an abrasive jet embodying the present invention includes a cutting apparatus 10 set at a cutting portion of a BSW1, an abrasive jet apparatus 20, a slurry processing apparatus 30, an exhaust processing apparatus 40, and a secondary block. It consists of a dismantling room 50, and the existing crane 5 in the building 4 is used as a lifting treatment device.

2 and 3, the cutting device 10 includes a downwardly U-shaped guide frame 12 fixed across the RSW1 from the upper end to the lower end and fixed by a pressing jack 11, and a lifting rail 14 on a guide rail 13 of the guide frame 12. The soundproof / leakage cover 17 that is guided by the motor and is moved up and down by the motor 16 of the pinion gear that meshes with the elevating rack 15, and RSW1 on the cover 17.
The jet nozzle 18 is provided toward the center of the.

In FIG. 1, an abrasive jet device 20 includes an ultrahigh pressure pump 21, an abrasive tank 23, and a monitor control board 25. The ultra-high pressure pump 21 is connected to a supply water source (not shown), is connected to the jet nozzle 18 via a high-pressure water pipe 22, and the abrasive tank 23 is connected to the jet nozzle 18 via an abrasive pipe 24. The monitoring control board 25 includes the abrasive jet device 20, and controls the entire cutting and disassembling device by remote control.

The slurry processing device 30 is a pump 3 connected to the slurry receiving tank 30a provided at the bottom of the RSW1 and a submersible pump 31a provided at the bottom of the tank 30a and the PCV3 via a slurry discharge pipe 31.
2, a magnetic separator 33 provided on the downstream side of the pump 32, an abrasive receiver 34 for receiving the abrasive separated by the magnetic separator 33, a raw water tank 35 for receiving water from the magnetic separator 33, and a raw water pump 36. A coagulation reaction tank 37 connected to the raw water tank 35 via a raw water pipe 36a,
A precipitation tank 38 provided on the downstream side of the aggregation reaction tank 37, and a precipitation tank
Sludge receiver 38a that receives sludge decomposed in 38,
It comprises a treated water tank 39 which receives the water from the settling tank 38. Note that reference numeral 31b in the drawing is a slurry discharge pipe for the slurry receiving tank 30a that has been lifted.

The exhaust treatment device 40 includes a cooling heat exchanger 43 connected to a steel lid 41 that covers an upper end opening of the RSW 1 via an exhaust pipe 42, and a mist eliminator 4 that is sequentially provided on the downstream side of the heat exchanger 43.
4, an electric heater type heater 45, a filter 46 and a turbo blower 47, and the heat exchanger 43 and the mist eliminator 44 are connected via a pipe 48 to a slurry discharge pipe of a slurry processing apparatus 30.
31, the turbo blower 47 is connected to an existing exhaust treatment facility (not shown).

The secondary block dismantling room 50 is provided in the building 4, and is provided with a cutting device 51 and a cren 52, and a secondary block.
A container 53 for storing 1B is prepared.

Next, the operation of the present invention will be described.

First, suspend the cutting device 10 with the wire 6 by the crane 5,
The guide frame 12 is lowered so as to straddle the RSW1, the pressing jack 11 is extended and fixed to the RSW1, the wire 6 is removed, and the steel lid 41 is set.

Next, the abrasive jet device 20, the slurry treatment device 30, and the exhaust treatment device 40 are operated, the pinion gear motor 16 is driven to lower the nozzle 18, and the RSW1 is axially cut from the upper end to the lower end by the abrasive jet. To do.
At this time, the slurry is collected in the slurry receiving tank 30a at the inner bottom of RSW1, the slurry leaked to the outside of RSW1 is processed by the slurry processing device 30 via the submersible pump 31a at the bottom of PCV3, and the dust and gas are exhausted by the exhaust processing device 40. Is processed in. In addition, receiving tank 30
A is hoisted by the crane 5 at appropriate times, and the slurry is discharged to the slurry discharge pipe 31b.

Next, in the same manner as described above, the guide frame 12 is moved in the circumferential direction by a predetermined chord length (for example, 1.48 m), and cut into the primary block 1A having a length of 13 m and a 1.48 m square, for example.

Then, the primary block 1A is lifted by the crane 5 and carried out to the secondary block dismantling chamber 50.

In the dismantling chamber 50, the primary block 1A is cut into a secondary block 1B of, for example, 3 m in the longitudinal direction by a cutting device 51 using an abrasive jet in the illustrated example (FIG. 4).
Crane 52 lifts secondary block 1B (5th
(Fig.), And store in a container 53 (Fig. 6).

FIG. 7 shows another mode of the small cut, and is an example of cutting by the cutting device 51a using a diamond wire.

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

() Since a cylindrical structure that is relatively difficult to disassemble can be cut into a relatively long primary block, the total length of the cutting line can be shortened due to the small number of slices, and the work efficiency is improved.

() Since the primary block is cut into secondary blocks that can be stored in the container in the secondary block dismantling chamber, the work can be easily automated.

() Since the secondary block dismantling room is provided in the building, the lifting process is easy and suitable for automation.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an apparatus for carrying out the present invention, FIG. 2 is a perspective view showing a cutting apparatus, FIG. 3 is a radial sectional view of FIG. 2, FIG. 4, FIG. 5, and FIG. Are perspective views showing the step of cutting the secondary blocks, respectively, and FIG. 7 is a perspective view showing another mode of the step of cutting the secondary blocks. 1 ... Heat shielding wall (RSW), 1A ... Primary block, 2B ... Secondary block, 10 ... Cutting device, 17 ... Soundproof / leakage cover, 18 ... Jet nozzle, 20 ... Abrasive jet device, 30 ... Slurry treatment Equipment, 40 ... Exhaust treatment equipment, 50 ... Secondary block dismantling room

Front page continued (72) Inventor Kenjiro Nakamura 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A-62-107168 (JP, A)

Claims (1)

[Claims] 1. A cutting and disassembling apparatus for cutting a cylindrical structure from the outer wall side to dismantle the cylindrical structure (1), and a guide frame (12) fixed by a pressing jack (11) over the upper end. , A cover (17) which can be moved up and down along a guide rail (13) provided on the guide frame (12), and an abrasive jet directed toward the center of the cylindrical structure (1) located inside the cover (17). A jet nozzle (18) for jetting, the guide frame (12) is suspended by a wire (6) of a crane (5) provided in the building (4), and further the crane of the building (4) A secondary block dismantling chamber (50) is provided on the traveling path of (5), a cutting device (51) and a crane (52) are provided in the secondary block dismantling chamber (50), and cutting is performed by the jet nozzle (18). The primary block (1A) Click dismantling chamber (50) 2
A cutting and disassembling device for a cylindrical structure, comprising a cutting device (51, 51a) for cutting into a next block (1B).