JP6805842B2 - Automatic opening forming device for reinforced concrete skeleton and how to use it - Google Patents

Description

The present invention relates to an automatic opening forming device for a reinforced concrete skeleton and a method of using the same.

Generally, in a nuclear power plant, when the reactor fuel melts due to the loss of the cooling material and cools and solidifies together with the reactor structural materials and control rods, debris-debris nuclear fuel material (fuel debris) is generated in the reactor. , Reactor pressure vessel (RPV: Reactor Pressure Vessel) and reactor containment vessel (PCV: Primary Containment Vessel) remain.

When decommissioning a nuclear reactor in which fuel debris is generated, it is important to recover the fuel debris in advance from the viewpoint of preventing radioactive contamination of the external environment.

Therefore, it has been proposed by the present inventors to collect the fuel debris by forming an opening on the side surface of the biological shield wall (BSW) surrounding the reactor containment vessel.

Patent Document 1 is, for example, a method showing a general technical level for recovering fuel debris by forming an opening on the side surface of the biological shielding wall.

JP-A-2016-114546

However, the biological shielding wall is composed of a reinforced concrete skeleton having a thickness of about 2 m for radiation protection, and also plays a role as a strength member of the building. Therefore, the reinforced concrete skeleton has a very thick reinforcing bar. (For example, the diameter is about 38 mm) is densely buried. Therefore, a so-called coring is performed by driving the sleeve of the boring device into the biological shielding wall and pulling it out to form a communication hole, and by repeating the coring, a large number of communication holes are formed in the biological shielding wall. When it is installed to form an opening, it is assumed that the sleeve of the boring device bites and stacks the cutting pieces of the reinforcing bar, and the work is stopped.

In a normal working environment, it is possible for workers to manually remove the stacked sleeves, but such work has become difficult under high doses, leaving room for improvement.

The present invention has been made in view of the above-mentioned conventional problems, and provides an automatic opening forming device for a reinforced concrete skeleton and a method of using the same, which can smoothly continue the work even if the sleeve bites and stacks the cutting pieces of the reinforcing bar. It is what we are trying to provide.

In order to achieve the above object, the automatic opening forming device for a reinforced concrete skeleton of the present invention is an automatic opening forming device for a reinforced concrete skeleton provided with a sleeve of a boring device for forming an opening by drilling a communication hole in the reinforced concrete skeleton. hand,
A cutting machine installed on the side where the boring device is arranged with respect to the reinforced concrete skeleton and cutting a sleeve stacked on the reinforced concrete skeleton.
The sleeve is arranged so as to be replaceable with the base end side of the sleeve cut by the cutting machine, and the outer peripheral portion on the tip end side of the sleeve is cored to a position where the tip end side of the sleeve remaining on the reinforced concrete skeleton is pulled out. Can be equipped with recovery sleeves of different calibers.

In the automatic opening forming device for the reinforced concrete skeleton, the reinforced concrete skeleton is a biological shielding wall of a nuclear power plant.
After cutting the sleeve with the cutting machine, while replacing the sleeve with a recovery sleeve, the cutting machine is capable of shielding the perforated communication hole, the cutting machine, and the sleeve remaining on the reinforced concrete skeleton. It is possible to provide a shielding door arranged on the front side of the.

The shielding door is provided in the opening forming window of the shielding chamber in which the boring device is deployed and covers the opening forming portion of the biological shielding wall.
It is preferable that the shielding chamber includes a carry-in / exit port for the sleeve and the recovery sleeve, and the carry-in / out door is attached to the carry-in / out port so as to be openable and closable.

Further, the recovery sleeve preferably has a larger diameter than the sleeve.

On the other hand, as a method of using the automatic opening forming device for the reinforced concrete skeleton, a coring step of forming a communication hole with a sleeve in the reinforced concrete skeleton with the carry-in / out door closed and the shielding door open is used.
When a sleeve is stuck on the reinforced concrete skeleton during the coring step, a cutting step of cutting the stacked sleeve with the cutting machine and a cutting step.
After cutting the sleeve in the cutting step, by closing the shielding door, a shielding step of shielding the communication holes already formed in the reinforced concrete skeleton, and
With the replacement step of opening the carry-in / out door while leaving the tip side of the sleeve cut in the cutting step, removing the base end side of the sleeve, replacing the sleeve with a recovery sleeve having a larger diameter, and closing the carry-in / out door. ,
A restoration step of opening the shielding door closed in the shielding step, coring the outer peripheral portion of the sleeve cut in the cutting step on the tip end side with the recovery sleeve replaced in the replacement step, and removing the tip end side of the sleeve. And do
After removing the tip end side of the sleeve in the restoration step, the coring step can be continued with a new sleeve to form an opening.

According to the automatic opening forming device for a reinforced concrete skeleton of the present invention and the method of using the same, it is possible to obtain an excellent effect that the work can be smoothly continued even if the sleeve bites and stacks the cutting pieces of the reinforcing bar.

It is a perspective view which shows the Example of the opening automatic forming apparatus of the reinforced concrete skeleton of this invention, and the method of use | It is a perspective view which shows the cutting machine (wire saw) in the Example of the opening automatic forming apparatus of the reinforced concrete skeleton of this invention, and the method of using it. It is a perspective view which shows the corring process in the Example of the opening automatic forming apparatus of the reinforced concrete skeleton of this invention, and the method of using it, (a) is the perspective which shows the state which makes the communication hole by a sleeve and forms an opening. FIG. 3B is a perspective view showing a state in which the sleeve is replaced, and FIG. 3C is a perspective view showing a state in which a communication hole is repeatedly formed by the replaced sleeve to form an opening. FIG. 3 is a plan view corresponding to FIG. 3 showing a coring step in an embodiment of the automatic opening forming device for a reinforced concrete skeleton of the present invention and a method of using the same, in which (a) is a sleeve to form a communication hole to form an opening. (B) is a plan view showing a state in which the sleeve is replaced, (c) is a plan view showing a state in which a communication hole is repeatedly formed by the replaced sleeve to form an opening. It is a perspective view which shows each process in the Example of the opening automatic forming apparatus of the reinforced concrete skeleton of this invention and the method of use, (a) is the perspective view which shows the cutting process, (b) shows a shielding process and a replacement process. A perspective view, (c) is a perspective view showing a restoration process. It is a top view which shows each step in the Example of the opening automatic forming apparatus of the reinforced concrete skeleton of this invention and the method of using it, (a) is a plan view which shows a cutting process, (b) shows a shielding process and a replacement process. The plan view and (c) are the plan views showing the restoration process. It is a flowchart which shows the Example of the opening automatic forming apparatus of the reinforced concrete skeleton of this invention, and the method of using it. It is a side sectional view which shows the example of the case where the reinforced concrete skeleton is a biological shielding wall of a nuclear power plant in the Example of the opening automatic forming apparatus of the reinforced concrete skeleton of this invention, and the method of using it.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 8 are examples of an automatic opening forming device for a reinforced concrete frame of the present invention and a method of using the same.

In this embodiment, as shown in FIG. 8, a case where an opening 5 is formed in a biological shielding wall 4 which is a reinforced concrete skeleton surrounding the reactor pressure vessel 2 and the reactor containment vessel 3 of the nuclear power plant 1 will be described. However, it goes without saying that it can be applied to a reinforced concrete skeleton other than the biological shielding wall 4.

On the side surface of the biological shielding wall 4, a shielding chamber 6 for covering the formed portion of the opening 5 is arranged.

As shown in FIG. 1, the shielding chamber 6 is composed of a hollow rectangular parallelepiped metal cell, and includes a front wall 7, a floor 8, a side wall 9, a ceiling 10, and a rear wall 11. Incidentally, in the drawings, for convenience of explanation, the front wall 7, the floor 8, the side wall 9, the ceiling 10, and the rear wall 11 are described so that the inside can be seen through. The front wall 7 is provided with an opening forming window 7a and is provided in close contact with the outer surface of the biological shielding wall 4 (see FIG. 8), and the shielding door 7b is attached to the opening forming window 7a so as to be openable and closable. ing. The rear wall 11 is provided with a carry-in outlet 11a, and the carry-in / out door 11b is attached to the carry-in outlet 11a so as to be openable / closable. Since the shielding door 7b is opened during the work of forming the opening 5, the front wall 7, the floor 8, the side wall 9, the ceiling 10, and the rear wall 11 of the shielding chamber 6 are shielded for radiation protection. It has a thickness, and the shielding door 7b and the loading / unloading door 11b also have a shielding thickness for radiation protection.

Inside the shielding chamber 6, a boring device 13 for forming a large number of communication holes 5a (see FIGS. 3 and 4) in the biological shielding wall 4 by a sleeve 12 to form the opening 5, and the boring device 13. A sleeve 12 is loaded into the bowling device 13, and an overhead crane 14 for recovering the sleeve 12 from the boring device 13 is provided. The boring device 13 rotationally drives the sleeve 12 and moves the sleeve 12 forward and backward with respect to the biological shielding wall 4, and supports the sleeve driving unit 15 and the sleeve 12 with respect to the biological shielding wall 4. It is provided with a position adjusting unit 16 for positioning. As shown in FIGS. 3 (a) and 4 (a), the position adjusting unit 16 includes a front support frame 16F that supports the sleeve drive unit 15 and the tip end side of the sleeve 12, and the sleeve drive unit 15 and the sleeve 12. It is provided with a rear support frame 16R that supports the base end side of the. The front support frame 16F and the rear support frame 16R are a guide rail 16a laid on the floor 8 and the ceiling 10 so as to extend in the horizontal direction along the surface of the biological shielding wall 4, and slidable along the guide rail 16a, respectively. The traverse block 16b arranged in the above, the guide pillar 16c arranged so as to extend in the vertical direction so as to span between the traverse blocks 16b, and the elevating block arranged so as to be able to move up and down along the guide pillar 16c. It has 16d. The sleeve drive unit 15 and the sleeve 12 are supported so as to be hung between the elevating block 16d of the front support frame 16F and the elevating block 16d of the rear support frame 16R.

In the opening forming window 7a of the front wall 7, a cutting machine 17 for cutting the sleeve 12 stacked on the biological shielding wall 4 is provided on the outer surface side of the biological shielding wall 4 (the side on which the boring device 13 is arranged). It is installed (see FIGS. 1 and 2). As the cutting machine 17, for example, a wire saw 17A can be adopted, and the wire saw 17A includes a drive pulley 17a (see FIGS. 5 (b) and 6 (b)), a guide pulley 17b, and a movable cutting machine. It includes a pulley 17c (see FIG. 2) and a wire 17d. As shown in FIGS. 5 (b) and 6 (b), two drive pulleys 17a are arranged inside the shielding chamber 6 and are rotationally driven by the motor 17e. A large number of the guide pulleys 17b are arranged inside the shielding chamber 6 (see FIGS. 5B and 6B) and at the edge of the opening forming window 7a (see FIG. 2). As shown in FIG. 2, the cutting movable pulley 17c is vertically arranged by a drive device (not shown) along a cutting frame 17f extending in the vertical direction at the edge of the opening forming window 7a. The wire 17d is hung around the drive pulley 17a, the guide pulley 17b, and the cutting movable pulley 17c. The wire saw 17A as the cutting machine 17 pushes the wire 17d to the outer peripheral surface of the sleeve 12 by rotating the drive pulley 17a by the motor 17e to reciprocate the wire 17d and lowering the cutting movable pulley 17c. The sleeve 12 is cut by hitting it.

Further, in order to remove the sleeve 12 that has been cut by the cutting machine 17 and remains on the biological shielding wall 4, a recovery sleeve 12X having a diameter different from that of the sleeve 12 (see FIGS. 5 (c) and 6 (c)) is used. It is equipped to be exchangeable. The inner diameter of the recovery sleeve 12X is larger than the outer diameter of the sleeve 12 in the examples shown in FIGS. 5 (c) and 6 (c).

Note that FIG. 7 shows the flow of each process described later in this embodiment as a flowchart.

Next, the operation of the above embodiment will be described.

As shown in FIG. 8, an opening 5 is formed on the side surface of the bioshield wall 4 made of a reinforced concrete skeleton surrounding the reactor containment vessel 3, and when fuel debris is collected, the side surface of the bioshield wall 4 is formed. The shielding chamber 6 is arranged.

In this state, the coring step is performed as shown in the flowchart of FIG. 7 (see step S1). During the coring step, it is determined whether or not the sleeve 12 is stacked (see step S2), and if the sleeve 12 is not stacked, it is determined whether or not all the formation of the openings 5 is completed. (See step S3) If the formation of the opening 5 is not completed, the process returns to step S1 and the coring step is repeated until all the formation of the opening 5 is completed.

If it is determined in step S2 that the sleeves 12 are stacked during the coring step, a cutting step is first performed (see step S4), followed by a shielding step (see step S5), and then. , A replacement step is performed (see step S6), and finally a recovery step is performed (see step S7). After the restoration step is performed, the process returns to step S1 and the coring step is restarted.

Hereinafter, the coring process, cutting process, shielding process, replacement process, and restoration process will be described in detail.

In the coring step, as shown in FIGS. 3A and 4A, the sleeve 12 of the boring device 13 is attached to the biological shielding wall 4 made of the reinforced concrete skeleton by the position adjusting unit 16. The communication hole 5a is bored by advancing while rotationally driving the sleeve drive unit 15 in the positioned state. At this time, the shielding door 7b opens the opening forming window 7a, but the loading / unloading door 11b closes the loading / unloading port 11a, so that radiation does not leak to the outside even if the communication hole 5a is bored. .. When the perforation of the communication hole 5a by the sleeve 12 is completed, the sleeve 12 is pulled back into the shielding chamber 6 by the sleeve drive unit 15, and the shielding door is as shown in FIGS. 3 (b) and 4 (b). 7b closes the opening forming window 7a, the carry-in / out door 11b opens the carry-in outlet 11a, and a new sleeve 12 is carried in and replaced with the sleeve 12 which has completed the drilling of the communication hole 5a. The work of replacing the sleeve 12, that is, the work of collecting the sleeve 12 from the boring device 13 and loading a new sleeve 12 into the boring device 13 is performed by the overhead crane 14. When the replacement of the sleeve 12 is completed, as shown in FIGS. 3 (c) and 4 (c), the carry-in / out door 11b closes the carry-in / exit 11a, the shielding door 7b opens the opening forming window 7a, and the position adjusting unit 16 The new sleeve 12 is positioned by the above, and a new communication hole 5a is formed by the rotational drive and the traveling operation of the sleeve 12 by the sleeve drive unit 15. Hereinafter, as long as the sleeve 12 is not stacked, the same operation as described above is repeated.

In the cutting step, when the sleeve 12 is stacked on the biological shielding wall 4 composed of the reinforced concrete skeleton during the coring step, the stacked sleeve is as shown in FIGS. 5 (a) and 6 (a). 12 is cut by a wire saw 17A as a cutting machine 17. At this time, the drive pulley 17a is rotationally driven by the motor 17e of the wire saw 17A as the cutting machine 17, and the wire 17d reciprocates. In this state, the cutting movable pulley 17c (see FIG. 2) is moved along the cutting frame 17f. When the wire 17d is lowered, the wire 17d is pressed against the outer peripheral surface of the sleeve 12 to cut the sleeve 12.

In the shielding step, after cutting the sleeve 12 in the cutting step, by closing the shielding door 7b as shown in FIGS. 5 (b) and 6 (b), the sleeve 12 is already formed in the biological shielding wall 4. The communication hole 5a is shielded. This minimizes the leakage of radiation to the outside.

In the replacement step, the carry-in / out door 11b is opened leaving the tip end side of the sleeve 12 cut in the cutting step, and the base end side of the sleeve 12 is removed, and the recovery sleeve 12X having a diameter larger than that of the sleeve 12 (FIG. 5). (B) and FIG. 6 (b)). The work of removing the base end side of the stacked sleeve 12 from the boring device 13 and loading the recovery sleeve 12X into the boring device 13 is also performed by the overhead crane 14 in the same manner as the normal sleeve 12 replacement. At this time, the carry-in / out door 11b opens the carry-in / exit 11a, but since the shielding door 7b is closed, there is no concern that radiation leaks to the outside. After the replacement step is completed, the carry-in / out door 11b is closed.

In the restoration step, the shielding door 7b closed in the shielding step is opened, and the outer peripheral portion on the tip end side of the sleeve 12 cut in the cutting step is as shown in FIGS. 5 (c) and 6 (c). The recovery sleeve 12X replaced in the replacement step is cored and pulled out, and the tip end side of the sleeve 12 is removed.

When the tip end side of the sleeve 12 is removed in the restoration step, the coring step is continuously performed by the new sleeve 12, and the opening 5 (see FIG. 8) is formed.

As a result, when a large number of communication holes 5a are formed in the biological shielding wall 4 by the sleeve 12 of the boring device 13 to form an opening 5, the sleeve 12 of the boring device 13 bites a cutting piece of a reinforcing bar. Even if the work is stuck and the work is stopped, the worker does not have to manually remove the stacked sleeve 12, and the workability under a high dose is greatly improved.

In this way, even if the sleeve 12 bites and stacks the cutting pieces of the reinforcing bar, the work can be continued smoothly.

Then, in the case of this embodiment, the reinforced concrete skeleton is the biological shielding wall 4 of the nuclear power plant 1, and after cutting the sleeve 12 with the cutting machine 17, the sleeve 12 is pierced while being replaced with the recovery sleeve 12X. A shield provided on the front side of the cutting machine 17 so as to be able to shield the provided communication hole 5a, the cutting machine 17, and the sleeve 12 remaining on the biological shielding wall 4 made of a reinforced concrete skeleton. It is equipped with a door 7b. With this configuration, by closing the shielding door 7b, it is possible to prevent radiation from leaking to the outside, which is effective in smoothly forming the opening 5 required when the reactor is decommissioned. ..

Further, the shielding door 7b is provided in the opening forming window 7a of the shielding chamber 6 in which the opening 5 of the biological shielding wall 4 is formed and the boring device 13 is deployed, and the shielding chamber 6 is the sleeve. The carry-in port 11a of the 12 and the recovery sleeve 12X is provided, and the carry-in / out door 11b is attached to the carry-in port 11a so as to be openable / closable. With this configuration, even if the shielding door 7b is open, if the loading / unloading door 11b is closed, radiation does not leak to the outside, and the forming work of the opening 5 can be performed more smoothly. Become.

Furthermore, the recovery sleeve 12X has a larger diameter than the sleeve 12. With this configuration, the tip end side of the sleeve 12 that has been stacked and cut can be taken into the inside of the recovery sleeve 12X for coring, and the tip end side of the sleeve 12 can be efficiently removed.

On the other hand, in the usage method of this embodiment, a coring step of forming a communication hole 5a with a sleeve 12 in the reinforced concrete skeleton with the carry-in / out door 11b closed and the shielding door 7b open, and the coring. When the sleeve 12 is stacked on the reinforced concrete skeleton during the process, the sleeve 12 is cut by the cutting machine 17 and the sleeve 12 is cut in the cutting step, and then the shielding door 7b is closed. The carry-in / out door 11b is opened and the base end side of the sleeve 12 is removed, leaving the tip side of the sleeve 12 cut in the cutting step and the shielding step of shielding the communication hole 5a already formed in the reinforced concrete skeleton. Then, the sleeve 12 is replaced with a recovery sleeve 12X having a larger diameter than the sleeve 12, and the carry-in / out door 11b is closed, and the shielding door 7b closed in the shielding step is opened, and the tip side of the sleeve 12 cut in the cutting step is opened. The outer peripheral portion is cored with the recovery sleeve 12X replaced in the replacement step to perform a recovery step of removing the tip end side of the sleeve 12, and after removing the tip end side of the sleeve 12 in the recovery step, a new one is used. The coring step is continuously performed by the sleeve 12 to form the opening 5. With this configuration, even if the sleeve 12 bites and stacks the cutting pieces of the reinforcing bar, the work can be smoothly continued while minimizing the leakage of radiation to the outside.

The automatic opening forming device for the reinforced concrete skeleton of the present invention and its usage are not limited to the above-described embodiment, and the sleeve is used with a recovery sleeve having a diameter smaller than that of the sleeve cut by stacking. Other changes may be made within the scope of the present invention, such as coring the outer peripheral portion on the tip side of the sleeve over the entire circumference and removing the tip side of the sleeve. Of course.

1 Nuclear power plant 4 Bio-shielding wall (reinforced concrete skeleton)
5 Opening 5a Communication hole 6 Shielding room 7a Opening forming window 7b Shielding door 11a Carry-in / exit 11b Carry-in / out door 12 Sleeve 12X Recovery sleeve 13 Boring device 17 Cutting machine

Claims (5)

An automatic opening forming device for a reinforced concrete skeleton equipped with a sleeve of a boring device for forming an opening by drilling a communication hole in the reinforced concrete skeleton.
A cutting machine installed on the side where the boring device is arranged with respect to the reinforced concrete skeleton and cutting a sleeve stacked on the reinforced concrete skeleton.
The sleeve is arranged so as to be replaceable with the base end side of the sleeve cut by the cutting machine, and the outer peripheral portion on the tip end side of the sleeve is cored to a position where the tip end side of the sleeve remaining on the reinforced concrete skeleton is pulled out. Automatic opening forming device for reinforced concrete skeletons with recovery sleeves of different calibers. The reinforced concrete skeleton is a biological shielding wall of a nuclear power plant.
After cutting the sleeve with the cutting machine, while replacing the sleeve with a recovery sleeve, the cutting machine is capable of shielding the perforated communication hole, the cutting machine, and the sleeve remaining on the reinforced concrete skeleton. The automatic opening forming device for a reinforced concrete skeleton according to claim 1, further comprising a shielding door arranged on the front side of the reinforced concrete frame. The shielding door is provided in the opening forming window of the shielding chamber in which the boring device is deployed and covers the opening forming portion of the biological shielding wall.
The automatic opening forming device for a reinforced concrete skeleton according to claim 2, wherein the shielding chamber includes a carry-in / exit port for the sleeve and a recovery sleeve, and the carry-in / out door is attached to the carry-in / out port so as to be openable / closable. The automatic opening forming device for a reinforced concrete skeleton according to claim 3, wherein the recovery sleeve has a larger diameter than the sleeve. A coring step of forming a communication hole with a sleeve in the reinforced concrete skeleton with the carry-in / out door closed and the shielding door open.
When a sleeve is stuck on the reinforced concrete skeleton during the coring step, a cutting step of cutting the stacked sleeve with the cutting machine and a cutting step.
After cutting the sleeve in the cutting step, by closing the shielding door, a shielding step of shielding the communication holes already formed in the reinforced concrete skeleton, and
With the replacement step of opening the carry-in / out door while leaving the tip side of the sleeve cut in the cutting step, removing the base end side of the sleeve, replacing the sleeve with a recovery sleeve having a larger diameter, and closing the carry-in / out door. ,
A restoration step of opening the shielding door closed in the shielding step, coring the outer peripheral portion of the sleeve cut in the cutting step on the tip end side with the recovery sleeve replaced in the replacement step, and removing the tip end side of the sleeve. And do
The method for using the automatic opening forming device for a reinforced concrete skeleton according to claim 4, wherein after removing the tip end side of the sleeve in the restoration step, the coring step is continuously performed with a new sleeve to form an opening.

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