JP6935995B2 - Waste collection device and waste collection method - Google Patents

Description

The present invention efficiently removes the buffer material surrounding the waste and collects the waste with respect to the waste recovery device and the waste recovery method for taking out the waste of high-level radioactive waste set in the disposal tunnel. Regarding possible waste collection devices and waste collection methods.

In geological disposal in which high-level radioactive waste is placed in the disposal tunnel, the surroundings of the waste are protected with cushioning material, and the soil pressure acting on the waste is buffered by filling the disposal tunnel with cushioning material. It also suppresses the contact of groundwater with the waste and suppresses the leakage of radioactive substances from the waste.

In such geological disposal, it is necessary to ensure the reversibility and recoverability of waste. That is, it is necessary to secure a method for collecting the waste, which collects the waste as needed.

As a method of recovering the waste, the step of digging up the waste with a cylindrical overcorer and the step of digging the buffer material remaining in the disposal mine after taking out the waste are alternately performed. A waste collection method is known in which horizontally placed wastes are sequentially collected. (See, for example, Non-Patent Document 1).

Further, there is known a waste recovery method in which an electrolyte solution such as salt water is sprayed onto a cushioning material to disintegrate the cushioning material and waste is taken out (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-11557

Nuclear Waste Management Organization of Japan "Ensuring the Safety of Geological Disposal Business (2010 Edition) -For the Realization of Safe Geological Disposal with Reliable Technology-", September 2011, p. 6-156

However, in the waste collection method described in Non-Patent Document 1, it is necessary to alternately replace the overcorer for digging out the waste and the excavator for removing the cushioning material to perform the work, and there is a problem that the waste collection efficiency is poor. was there.

Further, in the waste recovery method using the electrolyte solution described in Patent Document 1, it is known that the time required for the cushioning material to disintegrate increases as the saturation of the cushioning material increases. Although the cushioning material is unsaturated and the saturation of the cushioning material is low, the saturation of the cushioning material gradually increases due to the infiltration of ground water, so it takes a long time to disintegrate the cushioning material after a long period of time from disposal with salt water. There was a problem that it took time and the collection efficiency of waste was poor.

Therefore, a technical problem to be solved in order to efficiently recover the waste material placed in the cushioning material arises, and an object of the present invention is to solve this problem.

The present invention is proposed for achieving the above object, and the invention according to claim 1 is a device main body capable of traveling in a disposal tunnel along a traveling direction and excavation provided at the tip of the device main body. It is a waste collection device that is provided with means and takes out the waste that is set sideways by the buffer material filled in the disposal tunnel, and the excavation means is a central protective pipe that opens with a diameter larger than that of the waste. And an annular cutter head provided on the outer peripheral side of the central protective tube and rotatable around the central protective tube, the apparatus main body is arranged behind the central protective tube to dispose of the waste. An earth-discharging means having an accommodating portion for accommodating the accommodating portion, accommodating the accommodating portion capable of accommodating the waste transferred from the accommodating portion, and discharging the excavated cushioning material to the rear in the traveling direction of the apparatus main body. A plurality of waste bodies that are provided with a storage unit that can store the waste material transferred from the storage unit of the device main body in a state where the excavated buffer material is removed, and are laid horizontally behind the device main body in the traveling direction. providing waste recovery system further comprises a conveying device.

According to this configuration, the cutter head digs up the cushioning material, and the waste material passes through the central protective pipe and is stored in the storage portion, so that the cushioning material can be removed and the waste material can be collected in parallel. can.

In addition, since the central protective pipe is opened larger than the outer diameter of the waste, the waste is collected with the buffer material remaining in the waste, so that the waste is discarded due to the contact between the cutter head and the waste. It is possible to suppress damage to the body. Further, since the soil discharging means discharges the cushioning material accumulated in the disposal tunnel to the rear of the waste collecting device, the waste collecting device can continuously excavate the cushioning material.

The invention according to claim 2 is, in addition to the configuration of the invention according to claim 1, the cutter head is a cutter spoke that is radially extended from the peripheral surface of the central protection tube and is rotatable around the central protection tube. , A waste collection device comprising a cutter bit attached to the front surface of the cutter spokes.
Provide a waste collection device.

According to this configuration, since the cutter bits are arranged radially on the outer circumference of the central protection pipe, the cushioning material filled in the disposal tunnel can be removed over a wide range.

In the invention according to claim 3, in addition to the configuration of the invention according to claim 1 or 2, the accommodating portion is a roller conveyor provided on the main body of the apparatus, and the roller conveyor is below the waste body. Provided is a waste collection device including a lower roller that supports the waste and a side roller that supports the side of the waste.

According to this configuration, the roller conveyor supports the waste from below and from the side, so that the waste can be stably contained.

The invention of claim 4, wherein, in addition to the configuration of the invention according to any one of claims 1 to 3, housing portion of the device main body, the front Sharing, ABS棄体yield capacity portion substantially faces the conveying apparatus- Provided is a waste collection device provided in.

According to this configuration, the accommodating portion of the waste collection device and the accommodating portion of the waste transport device are formed substantially flush with each other, so that the waste can be moved horizontally from the waste recovery device to the waste transport device. It can be reprinted just by letting it.

The invention according to claim 5 is a waste recovery method using the waste recovery device according to any one of claims 1 to 4 , wherein the cutter head digs the cushioning material and the support portion is formed. A waste collection method for accommodating the waste that has passed through the central protection pipe and transferring the waste from the support portion to a waste transport device that is laid behind the waste collection device in the traveling direction. I will provide a.

According to this configuration, the waste is transferred to the waste transport device after the waste has passed through the central protective pipe and is stored in the storage section while the waste recovery device is digging the cushioning material. The cushioning material can be removed and the waste can be collected in parallel and continuously.

In the present invention, the waste collection device digs up the cushioning material, and the waste passes through the central protective pipe and is stored in the storage portion, so that the cushioning material can be removed and the waste can be collected in parallel. can.

The schematic diagram which shows the structure of the waste recovery system which applied the waste recovery apparatus which concerns on one Example of this invention. The front view which shows the waste collection apparatus of FIG. The rear view which shows the waste collection apparatus of FIG. The left side view which shows the waste recovery apparatus of FIG. The right side view which shows the waste recovery apparatus of FIG. The plan view which shows the waste collection apparatus of FIG. The schematic diagram which shows the structure of the accommodating part of a waste collection apparatus. The schematic diagram which shows the procedure of collecting waste using a waste collection system.

The present invention includes an apparatus main body capable of traveling along the traveling direction in the disposal tunnel and an excavation means provided at the tip of the apparatus main body in order to efficiently collect the waste settled in the cushioning material. It is a waste collection device that takes out the waste placed sideways by the cushioning material filled in the disposal tunnel, and the excavation means is the central protection pipe that opens larger than the waste and the outer peripheral side of the central protection pipe. It is provided with an annular cutter head that is provided around the central protection tube and can rotate around the central protection tube, and the main body of the device is provided with a storage portion that is arranged behind the central protection tube and accommodates waste.

Hereinafter, the waste collection system 1 using the waste collection device 10 according to the embodiment of the present invention will be described with reference to the drawings. In the following examples, when the number, numerical value, quantity, range, etc. of the components are referred to, the specific number is used unless otherwise specified or clearly limited to a specific number in principle. It is not limited, and may be more than or less than a specific number.

In addition, when referring to the shape and positional relationship of components, etc., unless otherwise specified or when it is considered that this is not the case in principle, those that are substantially similar to or similar to the shape, etc. shall be used. include.

In addition, the drawings may be exaggerated by enlarging the characteristic parts in order to make the features easy to understand, and the dimensional ratios and the like of the components are not always the same as the actual ones.

FIG. 1 is a schematic view showing the configuration of a waste collection system 1 to which the waste collection device 10 is applied. FIG. 2 is a front view showing the waste collection device 10. FIG. 3 is a rear view showing the waste collection device 10. FIG. 4 is a left side view showing the waste collection device 10. FIG. 5 is a right side view showing the waste collection device 10. FIG. 6 is a plan view showing the waste collection device 10. FIG. 7 is a schematic view showing the structure of the first roller conveyor 12.

Since waste liquid with a high level of radioactivity is generated in the reprocessing process of spent nuclear fuel, the high-level radioactive waste obtained by vitrifying this waste liquid is geologically disposed of by an appropriate artificial barrier according to its characteristics. The waste 2 which is a high-level radioactive waste is continuously arranged laterally in a disposal tunnel 3 having a diameter of about 2 m at predetermined gaps (for example, about 3 m). The waste body 2 is a container made of carbon steel formed in a cylindrical shape, and contains a vitrified body of high-level radioactive liquid waste inside. The disposal tunnel 3 is filled with a cushioning material 4 containing bentonite as a main component.

The waste collection system 1 collects the waste 2 that has been geologically disposed of. The waste collection system 1 is composed of a waste collection device 10, a waste transportation device 20, and an excavated soil transportation device 30.

The waste collection device 10 includes a device main body 11 that can travel along the traveling direction D. The apparatus main body 11 includes a first roller conveyor 12 as an accommodating portion, a caterpillar 13, and a drive source 14.

The first roller conveyor 12 is mounted on the apparatus main body 11. The first roller conveyor 12 is configured by alternately installing a horizontally provided lower roller 12a and lateral rollers 12b provided at both ends of the lower roller 12a so as to be inclined along the traveling direction D. There is. The first roller conveyor 12 may be stretched so that a plurality of wastes 2 can be accommodated side by side side by side.

The caterpillar 13 is attached to the lower part of the apparatus main body 11. In addition, instead of the caterpillar 13, a traveling portion having traveling wheels may be provided.

The drive source 14 is mounted on a drive source mounting frame 14a attached to the apparatus main body 11, and supplies power (flood control) necessary for driving the components constituting the waste collection device 10.

Further, the waste collection device 10 includes an excavation means 15 installed at the tip of the device main body 11. The excavation means 15 includes a central protection pipe 16 and a cutter head 17 provided on the outer periphery of the central protection pipe 16.

The central protective tube 16 is formed in a cylindrical shape and has an opening larger than the outer diameter of the waste body 2. For example, when the outer diameter of the waste body 2 is about 0.8 m, the inner diameter of the central protection pipe 16 is set to about 1 m. The central protective tube 16 is positioned so that the rotation axis A of the central protective tube 16 and the center C of the waste body 2 are substantially in the same linear shape. It is known that the waste 2 surrounded by the cushioning material 4 hardly sinks from the initial position immediately after geological disposal in the disposal tunnel 3, and the center C of the waste 2 is abbreviated as the center of the disposal tunnel 3. Match.

The cutter head 17 includes four cutter spokes 17a and a cutter bit 17b.

The cutter spokes 17a extend radially from the outer circumference of the central protective tube 16 in all directions. The cutter spokes 17a are extended so that the tip reaches the disposal tunnel 3. The cutter spokes 17a are connected to each other via an annular frame 17c. The cutter spokes 17a are rotatably attached around the central protective tube 16, and are rotated around the rotation shaft A by a rotary drive means including a drive motor, a drive gear, and the like (not shown).

The cutter bits 17b are attached to the front surface of the cutter spokes 17a side by side in a row. It is preferred that the cutter bit 17b be replaceably attached to the cutter spokes 17a so that it can be replaced if the cutter bit 17b is worn.

Behind the cutter head 17, a partition wall 18 provided integrally with the central protection pipe 16 is arranged. A soil discharge hole 18a is formed in the lower part of the partition wall 18. The cushioning material 4 (hereinafter referred to as “excavated soil”) deposited in front of the partition wall 18 flows from the soil discharge hole 18a to the belt conveyor 19 and is conveyed to the excavated soil transport device 30 via the belt conveyor 19. The belt conveyor 19 is a known one used for soil removal, and its configuration may be any.

With the above configuration, the waste collection device 10 can excavate the cushioning material 4 by rotating the cutter spokes 17a while the cutter bit 17b is pressed against the cushioning material 4.

As shown in FIG. 7, the lower roller 12a that supports the collected waste 2 from below is pivotally supported at both ends by a flange 13a erected from the caterpillar 13. Further, both ends of the lateral roller 12b that supports the waste body 2 from the side are pivotally supported by a flange 13b erected from the caterpillar 13 and a flange 14b joined to a drive source mounting frame 14a described later. .. The flange 14b is joined to the drive source mounting frame 14a via the H-shaped steel 14c. Further, the lower roller 12a and the side roller 12b are arranged so as to substantially overlap the peripheral edge of the opening of the central protection tube 16 when viewed from the side.

The waste transporting device 20 transports the waste 2 transferred from the waste collecting device 10 to a predetermined location. The waste transporting device 20 is placed behind the traveling direction D of the waste collecting device 10. The waste transport device 20 includes a second roller conveyor 21 as a storage unit and a caterpillar 22.

The second roller conveyor 21 has the same configuration as the first roller conveyor 12, and has a horizontally provided lower roller (not shown) and side rollers (not shown) provided at both ends of the lower roller at an angle. And are alternately installed along the traveling direction D. The second roller conveyor 21 may be stretched along the traveling direction D so that a plurality of waste bodies 2 can be accommodated side by side. The second roller conveyor 21 is provided substantially flush with the first roller conveyor 13, and when the waste transport device 20 is placed next to the waste collection device 10, the waste 2 is placed on the first roller conveyor. It is slidable from 12 to the second roller conveyor 21.

The caterpillar 22 is attached to the lower part of the waste carrier 20. In addition, instead of the caterpillar 22, a traveling portion having traveling wheels may be provided.

The excavated soil transport device 30 transports the excavated soil transported by the belt conveyor 19 to a predetermined place. The excavated soil transport device 30 is arranged behind the waste transport device 20 in the traveling direction D. The excavated soil transport device 30 includes a loading platform 31 for loading excavated soil and a caterpillar 32 attached to the lower part of the excavated soil transport device 30. In addition, instead of the caterpillar 32, a traveling portion having traveling wheels may be provided.

The operation of the waste collection system 1 is controlled by a control device (not shown). The operation conditions and the like of the waste collection device 10, the waste transportation device 20, and the excavated soil transportation device 30 are controlled by the control device, and it is not necessary to arrange an operator in the disposal tunnel 3, and unmanned operation can be realized.

Next, the procedure for collecting the waste 2 using the waste collection system 1 will be described with reference to FIGS. 8 (a) to 8 (e). In order to explain the procedure for collecting the waste 2 in an easy-to-understand manner, FIG. 8 shows a waste collection system in which the excavated soil transport device 30 and the belt conveyor 19 are omitted and only one waste transport device 20 is provided. .. Further, the description of the excavated soil discharge procedure performed in parallel with the collection of the waste body 2 will be omitted.

First, as shown in FIG. 8A, when the cutter spokes 17a rotate and the waste collection device 10 starts to travel in the traveling direction D, the cutter bits 17b start digging the cushioning material 4. At this time, the cushioning material 4 located in front of the central protection pipe 16 is not excavated. The traveling speed of the waste collection device 10 is set to, for example, 10 mm / min.

As the excavation of the cushioning material 4 progresses, as shown in FIG. 8B, the waste 2 placed in the substantially center of the disposal tunnel 3 invades into the central protection pipe 16. Since the inner diameter of the central protective pipe 16 is formed to be larger than the outer diameter of the waste 2, the waste 2 is not exposed but is protected by the cushioning material 4. That is, the central protection pipe 16 and the waste body 2 are separated by the thickness of the cushioning material 4. As a result, it is possible to prevent the waste body 2 from coming into contact with the central protection pipe 16 and being damaged.

As the excavation of the cushioning material 4 further progresses, as shown in FIG. 8C, the waste body 2 passes through the central protective pipe 16 and is placed on the first roller conveyor 12. Since the waste body 2 is supported by the first roller conveyor 12 from below and from the side, the waste body 2 stays at a predetermined position even when vibration occurs during excavation.

Then, when the first roller conveyor 12 is started, as shown in FIGS. 8 (d) and 8 (e), the waste 2 housed in the first roller conveyor 12 is placed behind the waste collection device 10. The waste transporting device 20 is transferred to the second roller conveyor 21 so as to slide.

Further, for example, when the target number of wastes 2 collected by the waste collection device 10 per day is set to 4, the waste transport device 20 secures a storage space for 4 wastes 2. As a result, it is not necessary to replace the waste transport device 20 during the collection work, and the collection work for one day can be continuously performed.

In this way, in the present invention, the waste collecting device 10 digs the cushioning material 4, and the waste 2 passes through the central protection pipe 16 and is accommodated in the first roller conveyor 12. Removal of 4 and recovery of waste 2 can be performed in parallel.

The specific configuration of the excavation means 15 is not limited to the above. For example, the structure, shape, and the like of the cutter spokes, the cutter bit, and the annular frame constituting the cutter head can be arbitrarily changed.

In addition, the present invention can be modified in various ways as long as it does not deviate from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

1 ・ ・ ・ Waste collection system 2 ・ ・ ・ Waste 3 ・ ・ ・ Disposal tunnel 4 ・ ・ ・ Cushioning material 10 ・ ・ ・ Waste collection device 11 ・ ・ ・ Equipment body 12 ・ ・ ・ First roller conveyor (1st roller conveyor Containment part)
12a ・ ・ ・ Lower roller 12b ・ ・ ・ Side roller 13 ・ ・ ・ Caterpillar 14 (of waste collection device) ・ ・ ・ Drive source 14a ・ ・ ・ Drive source mounting frame 15 ・ ・ ・ Excavation means 16 ・ ・ ・Central protection tube 17 ・ ・ ・ Cutter head 17a ・ ・ ・ Cutter spoke 17b ・ ・ ・ Cutter bit 17c ・ ・ ・ Circular frame 18 ・ ・ ・ Partition 18a ・ ・ ・ Soil removal hole 19 ・ ・ ・ Belt conveyor 20 ・ ・ ・ Disposal Body transport device 21 ・ ・ ・ Second roller conveyor (accommodation part)
22 ・ ・ ・ Caterpillar (of waste carrier) 30 ・ ・ ・ Excavated soil carrier 31 ・ ・ ・ Loading platform 32 ・ ・ ・ Caterpillar (of excavated soil carrier)

Claims (5)

A device main body capable of traveling in the disposal mine along the traveling direction and an excavation means provided at the tip of the device main body are provided, and the waste material placed sideways by the cushioning material filled in the disposal mine is taken out. It is a waste collection device
The excavation means includes a central protective pipe that opens with a diameter larger than that of the waste body, and an annular cutter head that is provided on the outer peripheral side of the central protective pipe and can rotate around the central protective pipe.
The apparatus main body includes a storage portion arranged behind the central protection pipe in the traveling direction to store the waste.
An earth removal means for discharging the excavated cushioning material to the rear of the apparatus main body in the traveling direction, and
A plurality of waste bodies that are provided with a storage unit that can store the waste material transferred from the storage unit of the device main body in a state where the excavated cushioning material is removed, and are arranged behind the device main body in the traveling direction. Transport device and
A waste collection device characterized by being further equipped with. The cutter head includes a cutter spoke that is radially extended from the peripheral surface of the central protection tube and can rotate around the central protection tube, and a cutter bit attached to the front surface of the cutter spoke. The waste collection device according to claim 1, wherein the waste collection device is characterized. The accommodating portion is a roller conveyor provided on the main body of the apparatus.
The waste according to claim 1 or 2, wherein the roller conveyor is composed of a lower roller that supports the lower side of the waste and a side roller that supports the side of the waste. Recovery device. The waste collection device according to any one of claims 1 to 3, wherein the storage portion of the device main body is provided substantially flush with the storage portion of the waste transportation device. A waste collection method using the waste collection device according to any one of claims 1 to 4.
The cutter head digs the cushioning material,
The support portion accommodates the waste that has passed through the central protection tube.
A waste collection method, characterized in that the waste is transferred from the support portion to a waste transport device laterally arranged behind the waste collection device in the traveling direction.

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