JPS6231144B2 - - Google Patents

Description

[Detailed Description of the Invention] Generally, nuclear power plants are decommissioned (decommissioned) after 30 to 40 years of use, depending on the architectural and mechanical lifespan of the facility. Various ideas are being considered, but in Japan, the final option is to dismantle and remove the reactor and construct a new reactor on the same site. The interior is highly activated or contaminated by neutrons and radioactivity leaking from the reactor. Therefore, when dismantling the building, there are two possible methods: leaving this part until the end, or removing it first.

This application aims to reduce the radiation exposure of workers during the subsequent demolition of general parts by first removing highly radioactive or contaminated concrete.
This invention relates to a method for dismantling the inner wall of a cylindrical thick-walled concrete structure that saves workers and work time.

The present application also describes the construction of a cylindrical thick-walled concrete structure in which highly radioactive or contaminated concrete can be automatically removed by remote control, thereby allowing the subsequent demolition of the general parts to be carried out safely. This invention relates to an inner wall demolition method.

To explain the embodiment now, a center pole 3 is installed in a center hole 2 of a cylindrical thick-walled concrete structure 1.
is inserted into the center pole 3, and an arm 6 with a jack 5 whose tip supports the running rail 4 is provided with a reaction arm 7 that supports the reaction force of the arm 6 with a jack. After supporting the tip on the inner wall other than the dismantled part, actuate the jack 5 of the arm 6 with the jack 5 to press and support the traveling rail 4 against the dismantled part, and then the automatic traveling attached to the traveling rail 4 After operating the cutter machine 8 or core drill machine 9 to cut or drill holes to a certain depth on the inner wall of the dismantled part, the center pole is pulled up, and the cutter machine or core drill machine is , insert the center pole into the center hole again, support the jacked arm and the reaction arm on the inner wall, and then insert a cross-shaped groove or hole into the root of the cut or drilled concrete block. The DARTA is inserted and operated to crack the concrete mass, cut it, and dismantle it into blocks.

The above is an explanation of the overall construction method, but to explain the device in more detail, in the case of Fig. 2, the arm 6 is mounted on the center pole 3 in three stages (top, middle, and bottom) and is raised and lowered by a hydraulic motor, and the reaction force Attach the bearing 10 of the arm 7 for use, attach the reaction arm 7 to the central bearing 10 as appropriate, attach the arm 6 with the hydraulic jack 5 in the middle to the upper and lower bearings 10 facing in the same direction, and A support fitting 11 for supporting the running rail 4 is provided at the tip, and the support fitting 11
A traveling rail 4 is attached to the traveling rail 4 so as to be slidable and stationary, an automatic traveling carriage 12 is attached to the traveling rail 4 so as to be freely traveling, and a blade 13 is provided on the automatic traveling carriage 12 to move forward and backward and rotate by a hydraulic motor. The blade 13 is vertically rotated to vertically cut the inner wall.

In the case of FIG. 3, two arms 6 are provided with a freely adjustable opening angle from a bearing 10 for the arms 6, and a running rail 4 is mounted horizontally on a support fitting 11 at the tip of the arm 6.
The automatic carriage 12 is attached so that the blade 13 can be horizontally rotated to horizontally cut the inner wall.

In the case of Fig. 4, the support fitting 11 at the tip of the arm 6
A traveling rail 4 is attached to the arm 6 so as to be parallel to the arm 6, and an automatic traveling carriage 12 is attached to the traveling rail 4.
, attach the core drill machine 9 to the automatic traveling carriage 12 in a reversible manner, use the core drill machine 9 to drill a hole horizontally in the inner wall, and once the hole has been drilled to a certain depth, pull out the core drill machine 9 from the hole and point it downward. The core drill machine 9 is turned over and the concrete block that has entered the core drill machine 9 is allowed to fall to the bottom.

The present application utilizes any of the above-mentioned devices to cut or drill holes in the inner wall of a cylindrical thick-walled concrete structure in the form of a grid. The cutting or drilling is carried out as follows. It is to be constructed.

A shielding chamber 15 made of a material that does not leak radioactivity is formed and arranged in the upper part of a cylindrical thick-walled concrete structure 1 provided in a containment vessel 14 and having a central hole 2 for installing a pressure vessel in the center thereof. The shielding chamber 15 is formed to a size that completely covers the upper part of the central hole 2.

After appropriately inserting the center pole 3 equipped with the arm 6, the reaction arm 7, the running rail 4, the cutter machine 8, or the core drill machine 9 into the central hole 2 from the upper center of the shielding chamber 15, the shielding chamber 15 is opened. After closing the upper part and then supporting the reaction arm 7 on the inner wall part other than the dismantled part, actuate the jack 5 to extend the arm 6 and move the running rail 4 with the support fitting 11 to the dismantled part of the inner wall. Press and fix.

After that, the cutter machine 8 or the core drill machine 9 is operated to cut or drill holes vertically or horizontally, and after cutting or drilling holes in the shape of a grid across the entire demolished part of the inner wall to form a block mass, the jack 5 , the arm 6 is retracted, the upper part of the shielding chamber 15 is opened, and the center pole 3 is
Pull up the cutter machine 8 or core drill machine 9 and replace it with DARTA, insert the center pole 3 from the upper part of the shielding chamber 15 again, close the upper part of the shielding chamber 15, and then move the reaction arm 7 to the part other than the dismantling part. After being supported on the inner wall portion, the jack 5 is activated to extend the arm 6, and the running rail 4 is pressed and fixed to the disassembled portion of the inner wall using the support fitting 11. After that, the daruta is inserted into a groove or hole that has been cut or drilled in the shape of a parallel cross, the daruta is pushed out, a crack is made at the base of the block mass, and the daruta is dropped into the cask located at the bottom of the central hole 2. be.

Reference numeral 16 denotes an exhaust pipe whose lower end opens into the central hole 2 and whose upper end protrudes from the shielding chamber 15. Reference numeral 17 denotes a horizontal passage for work, which is provided at the bottom of the cylindrical thick-walled concrete structure 1. It is formed so as to communicate with a working vertical hole 18 provided parallel to the central hole 2 of the structural hole 1.

The block mass dropped into the cask in the central hole 2 is transported through the horizontal passage 17 by an automatically traveling cask, moved to the lower part of the vertical hole 18, and the cask is lifted to the upper part by a take-out device such as a club bucket. Export the equipment outside through the equipment entrance/exit.

All of these operations are designed to be remotely controlled so that they can be carried out without being contaminated by radioactivity emitted from the activated concrete.

The present application can be applied not only to nuclear reactors but also to ordinary cylindrical concrete structures, and it goes without saying that this does not depart from the gist of the present application.

As described above, the present application inserts a center pole into the center hole of a cylindrical thick-walled concrete structure, and measures the reaction force of the jacked arm with the center pole supporting the running rail at the tip and the jacked arm. After installing a supporting reaction arm and supporting the tip of the reaction arm against the inner wall of the part other than the dismantled part, actuate the jack of the arm with the jack to press and support the traveling rail against the dismantled part, and then start traveling. After operating the self-propelled cutter machine or core drill machine attached to the cutting rail to cut or drill a hole to a certain depth in the shape of a grid on the inner wall of the dismantled part, the center pole is pulled up once and the cutter machine or core drill machine is operated. After replacing the core drill machine with Dalta, inserting the center pole into the center hole again, and supporting the jacked arm and reaction arm on the inner wall, cut or drill a hole in the concrete block. It is characterized by inserting a Daruta into the hole, making a crack at the base of the concrete block, cutting it, and dismantling it into blocks.The inner wall of thick-walled concrete can be cut and dismantled to the desired thickness, and it can also be cut and dismantled. This method has the advantage that the work is simple and easy because the blocks are made small and dropped to the bottom of the structure for disposal.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the reactor section, Figures 2 to 4
The figure shows three examples of devices for carrying out the invention of the present application.
The figure is a side view of one example, FIG. 3 is a plan view of two examples, and FIG. 4 is a side view of three examples.

Claims (1)

[Claims] 1 A center pole is inserted into the center hole of a cylindrical thick-walled concrete structure, and a jacked arm with a running rail supported at the tip of the center pole and a reaction force arm that supports the reaction force of the jacked arm After supporting the tip of the reaction arm against the inner wall of the part other than the dismantled part, actuate the jack of the arm with the jack to press and support the running rail against the dismantled part, and then After operating the traveling type cutter or core drill machine to cut or drill a hole to a certain depth in the shape of a well on the inner wall of the dismantled part, the center pole is pulled up once, and the cutter or core drill machine is moved to the Dalta. Replace,
After inserting the center pole into the center hole again and supporting the jacked arm and the reaction arm on the inner wall, insert the Daruta into the cross-shaped groove or hole in the cut or drilled concrete block and operate it. A method for dismantling the inner wall of a cylindrical thick-walled concrete structure, which is characterized by making a crack at the base of the concrete block, cutting it, and dismantling it into blocks.