JPH0262036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a demolition system for dismantling a cylindrical concrete heat shield wall within a concrete bioshield in a nuclear reactor.

When dismantling a concrete heat shield wall, the safety of workers must first be ensured.

To this end, it is necessary to improve the safety of the work itself and to contain the demolition work environment.

The present invention has been proposed in view of the above points, and its purpose is to provide a demolition system that can safely and efficiently dismantle concrete heat shielding walls.

The present invention provides a system for dismantling a cylindrical concrete heat shield wall installed inside a concrete bioshield, including a roof seal that seals a top opening of the bioshield, an upper portion attached to the top of the bioshield, and a lower portion attached to the top of the bioshield. For example, a main shaft supported by a support device on the pedestal of a reactor pressure vessel, and a heat shield wall cutting machine installed on the main shaft so as to be movable up and down and swingable via a lifting device and a turning device. a dismantled block carrying-out device that grasps and carries out the dismantled blocks cut by the cutting machine with a gripping device; a removing machine that removes slag and dust generated by cutting by the cutting machine; and a removing machine that removes the slag and A system for dismantling a concrete heat shield wall, comprising a collection device for collecting dust, an exhaust gas collection device for collecting exhaust gas from the biological shielding body, and a monitoring operation device for monitoring and controlling the operation of each of the devices. The main idea is to seal the opening at the top of the biological shield with a roof seal to contain the work environment, and to reduce the air supply by taking into account the rise in airflow and gas generation due to heat generation during cutting of the heat shield wall. Since the demolition equipment and exhaust gas recovery equipment are provided, demolition work can be carried out while maintaining a good working environment.

In addition, the cutting machine can be operated remotely by the monitoring operation device, and the heat shield wall can be cut and dismantled into blocks by using the lifting device and the rotation device, and the cut disassembly blocks can be grabbed by the gripping device and carried out one by one. It can be dismantled efficiently, and the slag and dust generated by cutting can also be removed and collected by the removal machine and collection device.

Therefore, according to the present invention, since the demolition work environment can be completely enclosed, the safety of the workers can be ensured, and the heat shielding wall can be cut and dismantled into blocks, so that the demolition can be carried out efficiently, and moreover, the demolition work can be efficiently carried out without using a cutting machine. In order to carry out work by remotely operating the
The integrity of the work itself can be improved.

Other objects and features of the invention will become apparent from the examples detailed below.

Figures 1 to 7 show an embodiment of the present invention, in which Figure 1 is a diagram of the overall system configuration, Figure 2 is a diagram of the support and movement mechanism of the cutting machine, and Figure 3 is a lifting device. Fig. 4 is a block diagram of the gripping device; Fig. 5 is a block diagram of the gripping device;
The figure shows the procedure for dismantling the heat shield wall, and FIG. 6 is a block diagram of the slag and dust removal machine.

Reference numeral 1 denotes a concrete biological shield of a nuclear reactor, and 2 denotes a cylindrical concrete heat shielding wall provided within the biological shield 1, which is an object to be dismantled by this demolition system. Reference numeral 3 denotes a roof seal that simply seals the top opening 4 of the biological shield 1 with a lid, and this roof seal 3 ensures that the inside and outside of the concrete biological shield 1 are at equal pressure; Prevent slag, dust, and exhaust gas from leaking outside. A main shaft 5 is installed at a central position within the heat shielding wall 2, and is supported by an upper support device 6 and a lower support device 7. The upper support device 6 and the lower support device 7 include a plurality of sets of extendable hydraulic cylinders 12 that are swingably mounted radially to mounting brackets 8 and 9 provided on the main shaft 5 via cylinders 10 and 11, respectively. and 13, the cylinder 10
and 11, it can be engaged with the top of the biological shield 1 and the pedestal of the heat shield wall 2 to swing the main shaft 5 between a position where it is supported and an open position.

Reference numeral 14 denotes a vertically movable lifting device that is installed through the main shaft 5, and as shown in FIG.
It consists of contractile and expandable grippers 17 and 18 provided at the upper and lower rings, a cylinder 19 that connects the upper and lower rings, and a base plate 21 that is connected to the upper ring 15 via a tie rod 20. As shown in Figures 3a to 3e, the upper and lower grippers 17,1
It is possible to move up and down along the main shaft 5 by alternately expanding and contracting the cylinder 8 and by contracting the cylinder 19.

Reference numeral 22 denotes a rotating device that is installed through the main shaft 5 and is capable of rotating, and includes a work platform 23 and a rotating platform 24.
It is installed on the lifting device 14. Note that the swivel base 24 is configured to be swiveled by a swivel mechanism (not shown).

Reference numeral 25 is a lifting and turning drive source installed on the lifting device 14, and 26 is a cutting machine installed on the turning device 22. The cutting machine 26 includes a plasma cutting machine, a lance bar cutting machine, and a powder jet cutting machine. , a flame jet cutting machine, etc. can be used, and this example shows an example using a plasma cutting machine. A plasma generation source 27 for a plasma cutting machine and a gas cylinder 28 are also mounted on the rotation device 22.

Although not shown, an operation control device, a position detection device, a cutting machine position adjustment device, a monitoring device, and the like are mounted on the lifting device 14 and the turning device 22.

Reference numeral 29 denotes a dismantling block carrying-out device, which is composed of an overhead traveling crane 30 and a dismantling block grasping device 31 suspended from the crane 30. This gripping device 31 grips the dismantled block cut into blocks by the cutter 26 and ascends. At this time, the block outlet 3A provided in the roof seal 3 is opened and the dismantled block is carried out. Then, it is stored in a dismantled block storage container 32 temporarily placed on the operating floor. In addition, block outlet 3A
is opened by a drive mechanism (not shown) only when the gripping device 31 is taken out and carried out and when the gripping device 31 is carried into the biological shielding body.

As shown in FIG. 4, the gripping device 31 includes a main body 35 suspended from a crane hook 33 via a wire 34, a plurality of gripping arms 36 swingably attached to the main body 35, and a carrier attached to the main body 35. Tsuchi cylinder 37, cylinder 37 and gripping arm 3
6, and opens and closes the arm 36 by the operation of the cylinder 37. Note that 39 shown in FIG. 4 is a power control line.

40 is a self-propelled removing machine that collects and removes slag and dust generated by plasma cutting on the floor surface, and as shown in FIG. an upper frame 43, a power control device 44 mounted on the upper frame 43, one end of which is pivotally supported by the upper frame 43;
Boom 4 swung via boom cylinder 46
5. A slag crushing device 47 attached to the tip of the boom 45, a yawing cylinder 48 for yawing the slag crushing device 47, a hose 49 connected to the crushing device 47 and sucking the slag and dust crushed by the device, and a hose reel. 50, it has a vacuum hose 51 connected to an external slag and dust collection device, and the solidified slag and accumulated dust are cut and crushed, and the vacuum hose sucks the solidified slag and accumulated dust and takes them out to the outside.

52 is a slag and dust collecting device, and a removing machine 40
A slag dust collector 53 is connected to a vacuum hose 51 from the container 51, and a separator 54 is connected to the container 53, and a built-in mesh-like filter 54f separates fine dust from exhaust gas. Furthermore, a suction/exhaust switching valve 55, a check valve 56, a vacuum pump 57, which are connected to this separator 54,
It consists of a filter 58, etc. Therefore, the slag and dust from the remover 40 are first collected in the collection container 53, and then fine dust in the exhaust is removed by the separator 54, and finally the exhaust is passed through the filter 58.
It is discharged to the outside through.

Note that automatic switching equipment that detects when the container 53 is full and switches it to an empty container, a vehicle that carries out the container, a container loading machine that loads the container onto the vehicle, etc. can be used. Further, vacuum pressure, flow rate, etc. can be monitored and operation controlled by providing detection equipment. 59 is an air supply device that supplies air into the biological shield 1; an air supply blower 60;
It is composed of a filter 61. Reference numeral 62 denotes an exhaust gas recovery device for recovering exhaust gas from inside the biological shield 1, which includes a primary blower 63, a secondary blower 64, a primary catcher 65 that performs gravity sedimentation processing and constitutes a dust trapping device, and a secondary catcher that performs cyclone sedimentation treatment. 66, a tertiary catcher 67 for performing precipitation treatment in the liquid, a filter 68, an exhaust pipe 69, etc. As shown in FIG. Next, a blower 64, a filter 68, and an exhaust pipe 69 are connected in this order.

Although not shown, an automatic switching facility for the primary catcher 65 and the secondary catcher 68, and a sediment discharge facility for the tertiary catcher 67 may be provided.

Reference numeral 70 denotes a central monitoring and operating device that monitors and controls the operation of each piece of equipment, including a television camera that monitors the work status (not shown), monitors the operating status of various types of equipment for abnormalities, and maintains a stable working environment. The system consists of various detection devices installed at appropriate locations, a central operation control device, a monitoring device, and an environment measuring device for monitoring.

Next, the action will be explained.

First, after lowering the main shaft 5 into the heat shielding wall 2, it is fixed by the support devices 6 and 7, and the shaft is installed.At the same time, the top opening 4 of the biological shielding body 1 is sealed with the roof seal 3, and each Place the equipment in the specified condition.

To dismantle the heat shield wall 2, use the cutting machine 26 and the lifting device 14.
The process begins with setting the cutting position at a predetermined cutting position. During cutting, air is supplied by an air supply device 59 to maintain a good working environment, and an exhaust gas recovery device 62 is also operated in consideration of the rise in airflow and gas generation due to heat generation during cutting.

The cutting of the heat shielding wall 2 is carried out by remote operation under the supervision of a television camera, and by arbitrarily adjusting the nozzle position control, cutting speed control, etc. of the plasma cutting machine 26.

For cutting, first, as shown in FIG. 5a, the plasma cutter 26 is moved vertically by the lifting device 14 to cut vertically at appropriate intervals. Next, the block is carried in by opening the block outlet 3A. Then, the extraction port 3A is closed and the gripping device 31 is lowered. As shown in FIG.
When the block is turned and cut horizontally as shown in Fig. 5c, it is cut into blocks, which are lifted up by the gripping device 31 as shown in Fig. 5d, and carried out through the block outlet 3A. As shown in FIG. 5e, the blocks are sequentially stored in a dismantled block storage container 32 placed on the operating floor. As mentioned above, the block outlet 3A of the roof seal 3 is connected to the gripping device 31.
Since the length is opened when the biological shield 1 is carried in and out, slag, dust, and exhaust gas inside the biological shield 1 will not leak to the outside. By repeating the above operations, the heat shield wall 2
It can be dismantled, and since it is cut into blocks and dismantled and removed, it is easy to dispose of it as waste.

Further, slag and dust generated by plasma cutting are removed on the floor by a self-propelled removing machine 40. As shown in FIG. 6, this removing machine has a crushing device 47, which cuts and crushes solidified slag or accumulated dust, sucks it, and collects it into a slag and dust container 53 via a vacuum hose 51. The air from which slag and dust have been separated is discharged through a filter 58.

On the other hand, the exhaust gas recovered by the exhaust gas recovery device 62 is transferred to the primary catcher 65 and the secondary catcher 6.
6 and a tertiary catcher 67, the air is subjected to various treatments to trap dust and other particles, and the purified air is exhausted from an exhaust pipe 69 after passing through a filter 68.

In addition, the dismantling block storage container 32, the slag dust collection 53, the containers for the primary catcher 65 and the secondary catcher 66, or the tertiary catcher 6
When the sediment transport container, etc. in No. 7 becomes full, it shall be automatically replaced with an empty container.

Further, the above-mentioned monitoring of the work status, operation status of each device, monitoring of the presence or absence of abnormality, recording of various data, etc. are centrally managed and performed at a single location in the central monitoring and operating device 70.

As detailed above, when dismantling the heat shielding wall of a nuclear reactor, the demolition work environment can be completely contained, ensuring the safety of the workers, and disassembling the reactor while cutting it into blocks. Therefore, it can be dismantled efficiently.

Additionally, since each device is operated remotely, the safety of the work itself can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a system showing an embodiment of the present invention, Fig. 2 is a configuration diagram of a support movement mechanism of a cutting machine, and Figs. 3 a to e are configuration diagrams showing the structure and operating state of a lifting device. , FIG. 4 is a block diagram of the gripping device, FIGS. 5 a to 5 e are diagrams showing the procedure for dismantling the heat shielding wall, and FIG. 6 is a block diagram of the slag and dust removal machine. DESCRIPTION OF SYMBOLS 1... Biological shield, 2... Heat shielding wall, 3... Roof seal, 4... Top opening, 5... Main shaft, 6... Upper support device, 7... Lower support device,
14...Elevating device, 22...Swivel device, 26...
Plasma cutting machine, 29...dismantled block unloading device, 31...grabbing device, 40...removal machine, 52...
...Slag and dust collection device, 59...Air supply device,
62...Exhaust gas recovery device, 70...Central monitoring operation device.

Claims (1)

[Scope of Claims] 1. A system for dismantling a cylindrical concrete heat shield wall installed within a concrete bioshield, comprising: a roof seal sealing a top opening of the bioshield; A main shaft supported on the pedestal via a support device, a cutting machine for the heat shield wall installed on the main shaft so that it can move up and down and rotate via a lifting device and a turning device, and a cutting machine for cutting the heat shield wall. a dismantled block carrying-out device that grasps and carries out the dismantled blocks with a grasping device; a removing machine that removes slag and dust generated by cutting by the cutting machine; and a recovery device that collects the slag and dust removed by the removing machine. , comprising an air supply device that supplies air into the biological shielding body, an exhaust gas recovery device that recovers exhaust gas from the biological shielding body, and a monitoring operation device that monitors and controls the operation of each of the devices. Demolition system for concrete heat shielding walls. 2. The concrete heat shield wall dismantling system according to claim 1, wherein the support device is constituted by a plurality of hydraulic cylinders that are swung between a holding position and a release position. 3. The lifting device includes a pair of upper and lower grippers and a cylinder connecting the two grippers, and is raised and lowered by gripping and releasing the grippers from the main shaft and by expanding and contracting the cylinder. A system for dismantling concrete heat shielding walls as described in Scope 1. 4. The swing device is installed on the lifting device,
4. The concrete heat shield wall demolition system according to claim 1, wherein the concrete heat shield wall demolition system is capable of rotating around the main shaft. 5. Claim 1, wherein the gripping device has a swingable gripping arm that grips the dismantling block, and a cylinder that swings the arm.
Demolition system for concrete heat shield walls as described in Section 1. 6. The concrete heat shielding wall dismantling system according to claim 1, wherein the removing machine includes a traveling device, a crushing device for crushing solidified slag, and a vacuum hose for sucking the crushed slag. . 7. The slag and dust collection device is connected to a slag and dust collection container connected to the vacuum hose of the remover, and to the collection container via a separator for separating fine dust and exhaust gas, an intake/exhaust switching valve, and a chuck valve. Claim 1 comprising a vacuum pump and a filter connected to the vacuum pump via the suction/exhaust switching valve.
Demolition system for concrete heat shield walls as described in Section 1. 8. The concrete heat shielding wall demolition system according to claim 1, wherein the exhaust gas recovery device includes an exhaust blower, a dust trapping device, and a supply air cleaning device. 9. The dust trapping device is comprised of a primary catcher that performs gravity sedimentation treatment, a secondary catcher that performs cyclone sedimentation treatment, and a tertiary catcher that performs submerged sedimentation treatment. The concrete heat shield wall demolition system as described in item 8. 10. Claim 8, characterized in that the exhaust blower is comprised of a primary blower provided downstream of the primary catcher and a secondary blower provided downstream of the tertiary catcher. concrete thermal shielding wall demolition system.