JP2002107493A - Method and facility for stationary fixing of waste body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize a disposal space for waste bodies, to increase the stationing volume for the waste bodies, to dispose the waste bodies by remote control of high reliability while using a simple and relatively inexpensive device constitution, and to carry out precise stationing work, in a tunnel type disposal facility and the like for a radioactive waste and the like. SOLUTION: The waste bodies A are conveyed in order by a conveying carriage 11 traveling on a rail 10, as a guide, laid along a longitudinal direction in a bottom face of a storage pit 2 arranged while surrounded by an outer circumferential filler 3 inside a tunnel 1, a load carrying table 15 of the carriage 11 is lowered in a prescribed stationing position to transfer the waste body A in the first stage on the table onto a support frame 12, the table 15 is elevated by an elevator 16 in the second stage and therafter, and the waste body A on the table is push-transferred by a push-transfer device 17 to be transferred onto the waste body A in the stationing position while being guided by wheels 18 of the waste body A and guide grooves 19, 20 of the waste body A carrying table 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for placing a waste body in a disposal space in a facility for burying radioactive waste or the like.

[0002]

2. Description of the Related Art Low-level radioactive waste and TRU (trans
uranium) As a method of disposing of waste,
A method of burying waste in a tunnel excavated in rocks deeper than about 0 m has been considered. FIG. 3 shows an example of such a waste burial disposal facility. This tunnel-type waste burial disposal facility excavates a tunnel 1 in a bedrock by a mountain tunnel method or the like, constructs a concrete pit 2 in which a waste body A is to be placed in the lower center of the tunnel, and constructs a pit 2 around the pit 2. Is filled with an outer peripheral filler 3 made of a mixed soil containing bentonite as a main component.

The waste A is suspended from the upper opening of the pit 2 into the pit 2 by using a stationary crane running on the pit 2 in the longitudinal direction of the tunnel. The waste body A is a closed container having a rectangular parallelepiped shape or the like, and is stacked vertically and horizontally in the pit 2 in a plurality of rows and a plurality of stages. In the longitudinal direction of the tunnel, a plurality of rows and a plurality of stages of the waste bodies A are continuously placed. Waste A
The gap between the pit 2 and the pit 2 is filled with a filler 4 made of a cement-based material, and the upper opening is covered with a concrete lid 2a. The stationary work is completed by removing the stationary crane, covering the pit 2 with the outer peripheral filler 3 and backfilling the upper space of the tunnel 1 with the backfill soil 5.

[0004]

The stationary crane used for the stationary operation of the waste body includes a traveling body running on a pair of left and right rails laid on the upper surface of the concrete pit 2 in parallel with the longitudinal direction of the tunnel, and a hoisting device. A space 6 for a stationary crane is required above the pit 2 as shown in FIG. Waste weight is number
For heavy objects exceeding 10t, crane height is 7-8m
As a result, the crane occupies the upper space such as the tunnel 1. For this reason, the height of the pit 2 must be reduced, and there is a problem that the fixed volume of the waste body is drastically reduced.

As a means for solving such a problem, there has been proposed a system in which a forklift or the like is moved in the longitudinal direction of the tunnel to perform a stationary operation. However, in this method,
When the weight of the waste body is several tens of tons, there is a problem that the forklift and the like become huge. It is necessary to dispose of radioactive waste with a high radioactivity concentration remotely.However, in order to run parts without guides by remote control and to accurately place the waste body in the fixed position, the reliability at present is high. -Poor reality.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to effectively utilize a disposal space of a waste body and increase a stationary volume of the waste body. In addition, the present invention provides a method and a facility for disposing of a waste body, which can dispose of the waste body by a highly reliable remote operation with a relatively simple and inexpensive apparatus configuration and can perform a precise placement work. Is to do.

[0007]

A first aspect of the present invention is a stationary method in which wastes are sequentially carried into a disposal space, and the wastes are stacked and placed at a predetermined stationary position in the disposal space. The wastes are sequentially transported by the transport carriage that runs on the guide provided at the bottom of the space, and the waste on the carrier of the transport vehicle is transferred to the support frame at the predetermined stationary position, and the carrier of the transport vehicle is raised. Then, the waste body on the loading platform is transferred onto the waste body on the support frame.

In the first aspect of the present invention, the first stage of the waste body is moved down to the support platform by lowering the carrier positioned on the support platform, or by pushing the support platform and the upper surface of the cargo platform at the same level. Etc. will be transferred. The wastes in the second and subsequent stages are transferred by pushing up the loading platform so that the level of the upper surface of the loading platform matches the level of the upper surface of the waste body at the fixed position.

[0009] A second aspect of the present invention is the method for placing a waste body according to the first aspect, wherein the disposal space is a disposal tunnel excavated and formed in the rock. . This disposal tunnel is a horizontal or inclined tunnel, and is excavated by a mountain tunnel method, a shield method, or the like. The invention is applicable to any type of disposal space.

According to a third aspect of the present invention, in the method for placing a waste body according to the first or second aspect, a storage body for the waste body is provided in the disposal space, and the storage body is disposed at a predetermined stationary position in the storage body. This is a method of placing a waste body, wherein the waste bodies are stacked and placed. That is, in the case of radioactive waste, a storage skeleton is constructed in a disposal space such as a tunnel type, and around this storage skeleton, a bentonite mixed soil having a buffer function, low water permeability, and low diffusion of radioactive materials is used. It is preferable to dispose in a burial disposal facility provided with such an outer peripheral filler.

According to a fourth aspect of the present invention, there is provided a stationary equipment for sequentially transporting wastes into the storage skeleton in the disposal space, stacking the wastes in a predetermined position in the storage skeleton, and placing the wastes in the storage skeleton. A transport trolley that runs on the provided guide, and a support gantry that is installed on the bottom of the storage skeleton at the fixed position and supports the waste body, the transport trolley has a liftable loading platform,
Disposal equipment for disposing of a waste body, comprising a transfer device for transferring the waste on the loading platform to the waste body at a stationary position or onto a support frame. This stationary equipment is also a tunnel type,
It can be applied to other types of disposal space, and in the case of radioactive waste, it is preferably applied to a buried disposal facility provided with the above-mentioned containment frame and peripheral filler.

According to a fifth aspect of the present invention, there is provided the waste disposal equipment according to the fourth aspect, wherein a guide for guiding a lower surface of the waste is provided on an upper surface of the waste. Stationary equipment.

In the first to fourth aspects of the present invention, the carriage is provided with wheels and the like, and the guide (track) is a rail or a guide groove for guiding the wheels and the like. It is preferable to use a lifting / lowering device having a large loading load and a lifting / lowering stroke including a link mechanism and a jack for lifting / lowering the loading platform. It is preferable to use a pushing device such as a jack provided on the carrier as the waste transfer device. Since the first-stage waste can be transferred by lowering the loading platform, a transfer device is used for the second-stage or higher waste. The transfer device can also be used to transfer the first stage waste. The support gantry is designed so that the first stage waste can be easily transferred from the transport trolley and fixed.
In addition, a filler is provided so that the lower portion of the stacked waste body can be filled with the filler.

According to a fifth aspect of the present invention, a guide groove or a guide rail is used as a guide on the upper surface of the waste body, and
Rolling members or sliding members such as wheels and rollers are provided so that the waste can be transferred smoothly and accurately.

[0015] In the above-described configuration, since the transport trolley travels in the disposal space, the carrier of the transport trolley is raised and lowered, and the wastes are stacked, the conventional stationary crane can be eliminated, and the disposal space can be effectively used. can do. In particular, in a tunnel-type disposal facility, the storage efficiency of wastes is greatly improved by eliminating the installation space for a stationary crane that occupies a large portion of the upper part of the disposal space.

Since the carrier for transporting the waste body travels on the guide (track), the reliability of the remote operation is significantly improved as compared with the forklift system, and the waste body can be quickly and accurately placed at a predetermined stationary position. .

[0017] Since the transport vehicle transports the waste by placing the waste on the carrier, lifting it up and down, and pushing it in with a pushing device, it does not require a counterweight or the like, so it is very compact and simple. Structure
Reliable and economical as a mechanical and operating system.

By providing a guide for placing the wastes to be stacked on the upper surface of the wastes, the wastes to be stacked on the waste can be simply and accurately stacked by simply pushing the wastes to be stacked on the waste.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. This embodiment is an example in which the present invention is applied to a radioactive waste burial disposal facility in which a concrete pit is installed in a three-core tunnel using a mountain tunnel method. FIG. 1 shows an example of a tunnel-type burial disposal facility to which the present invention is applied and an example of a stationary facility of the present invention. FIG. 2 shows the embedding method of the present invention in the order of steps.

In FIG. 1A, a three-core circular tunnel 1 as a disposal tunnel is excavated in a bedrock having a depth of about 100 m to 300 m underground by a mountain tunnel method. A concrete pit 2 as a storage skeleton to be fixed is constructed, and around this pit 2, an outer peripheral filler 3 made of a mixed soil mainly composed of bentonite is installed so as to surround the entire circumference. On the inner surface of the tunnel 1, a shotcrete 1a and a secondary lining 1b are constructed. The bentonite mixed soil of the outer peripheral filler 3 is:
A material with a buffer function, low water permeability, and low diffusion of radioactive materials. It can reduce the effects of rock pressure and groundwater and delay the migration of nuclides.

The waste body A is a rectangular parallelepiped hermetically sealed container in which metal or concrete waste hardened by cement, asphalt, or the like is stored. The waste A is vertically and horizontally in a cross section orthogonal to the longitudinal direction of the tunnel in the pit 2. Are stacked in multiple rows and multiple levels. Further, such a plurality of rows and a plurality of stages of waste bodies A are continuously placed in the longitudinal direction of the tunnel.

When the stationary work of the waste body A is completed, the gap between the waste body A and the pit 2 is filled with a filler 4 made of a cement material. The emplacement work is completed by backfilling the upper space of the tunnel 1 with the backfill soil 5.

In the above-mentioned buried disposal facility, in the present invention, as shown in FIG. 1 (b), a pair of left and right traveling rails 10 parallel to the longitudinal direction of the tunnel are laid on the bottom surface of the concrete pit 2, and Waste A on the running rail 10
Is transported, and the waste bodies A are stacked and placed on a support stand (stationary stand) 12 installed at a predetermined stationary position. The support gantry 12 is provided so that the first-stage waste body A can be easily transferred from the transport trolley 11 and fixed.
The filler 4 is also provided so that the lower part of the stacked wastes A can be filled with the filler 4.

A plurality of pairs of traveling rails 10 are provided in accordance with the number of rows of the disposed waste A in the tunnel width direction. Similarly, the support gantry 12 is arranged in the tunnel width direction by the number of rows of the waste bodies A, and is installed so as to be located at each laying position of the pair of traveling rails 10. Also, this support base 12
Are disposed at predetermined intervals so that the waste bodies A placed adjacent to each other in the longitudinal direction of the tunnel do not hit each other (see FIG. 2).

As shown in FIG. 1B, the carriage 11 is a carriage body 1 having wheels 14 that roll on a running rail 10.
3 is provided with a loading platform 15 which can be moved up and down. The lifting mechanism 16 that raises and lowers the loading platform 15 includes, for example, a pantograph-type link mechanism 16a and a hydraulic jack 16b that expands and contracts the link mechanism 16a at the center intersection, and has a relatively simple configuration and a large loading load. A large lifting stroke can be obtained. The lifting mechanism 1
The mechanism 6 is not limited to this, and another mechanism that can lift a heavy object to a high place can be used.

The first stage waste A is transferred onto the support platform 12 by moving the transport vehicle 11 into the support platform 12 and lowering the loading platform 15. Therefore, the support base 12 is a gate-shaped frame 12 parallel to the tunnel longitudinal direction.
a are arranged outside the pair of traveling rails 10 so that the carriage 11 can enter (see FIG. 2).
In addition, the width of the carrier 15 is smaller than the installation interval of the pair of left and right frames 12a.
It should be larger than the installation interval of a. In addition, the support base 1
If the pair 2 is composed of a pair of left and right frames 12a as described above, the transport trolley 11 can be run even if a large number of support frames 12 are installed in advance in the longitudinal direction of the tunnel.

The waste body A in the second and subsequent stages is slid in the longitudinal direction of the tunnel on the carrier 15 which has been raised to a predetermined height, and is transferred onto the waste body A at the fixed position. Therefore, as shown in FIG. 1 (c), a pushing device 17 such as a hydraulic jack or a mechanical jack is provided as a transfer device on the lower surface of the carrier 15 so that the waste A on the carrier 15 can be pushed. Further, wheels 18 are provided on the lower surface of the waste body A, and a pair of guide grooves 19, 20 parallel to the longitudinal direction of the tunnel for guiding the wheels 18 are provided on the upper surface of the waste body A and the loading platform 15, respectively. Be able to transfer well.

The end of the guide groove 19 on the upper surface of the waste body A on the side of the carriage is formed in a trumpet shape that opens toward the carriage in plan view so that the waste A on the carrier can be smoothly transferred. . Further, a stopper 21 for stopping the wheel 18 is provided at the end of the guide groove 19 of the waste body A on the side opposite to the carriage.
Is provided so that the transferred waste body A is positioned and fixed. Further, it is preferable that similar stoppers 22 are provided at both ends of the guide groove 20 of the loading platform 15 so as to be able to protrude and retract, so that the waste body A can be fixed during transportation.

Although the first-stage waste body A is transferred to the support base 12 by lowering the loading platform 15, it is supported using the pushing device 17, the wheels 18, and the guide grooves 20 of the loading platform. The slide can be transferred onto the gantry 12. In this case, the support gantry 12 can use an ordinary gantry instead of a special pair of frames 12a.

It is needless to say that the transfer guide mechanism is not limited to the wheels and the guide grooves, but may use other rolling elements, guide rails, and the like. Further, a shuttle fork system in which a fork moves forward and backward can be used as the transfer mechanism.

Using the stationary equipment described above, the waste is placed in the following procedure (see FIG. 2).

(1) A pair of left and right traveling rails 10 are laid on the bottom surface of the concrete pit 2 by the number of stationary rows of the waste bodies A. The support gantry 12 is set in advance at the stationary position of each row.

(2) The waste A transported in the main tunnel (not shown) is transferred to the loading platform 15 of the transport vehicle 11 at the entrance of the tunnel 1 and the transport vehicle 11 is moved to the fixed position on the support platform 1.
Run up to 2. The transport vehicle 11 is caused to enter the support frame 12.

(3) By lowering the bed 15, the waste A on the bed 15 is transferred to the support base 12. The carriage 11 is returned to the entrance of the tunnel.

(4) When the first-stage waste body A is settled, the carriage 11 is driven to carry in the second-stage waste body A.

(5) The carrier 15 is lifted up just before the support base 12 so that the upper surface of the first stage waste body A and the upper surface of the carrier 15 are at the same level.

(6) The second-stage waste body A on the loading platform 15 is pushed and slid, and is transferred onto the first-stage waste body A.

(7) The transferred second-stage waste body A is fixed by the stopper of the first-stage waste body A, and is fixed at a predetermined position. The carrier 11 lifts down the carrier 15 and is returned to the tunnel entrance.

(8) With respect to the waste bodies A in the third and higher stages, the above-described steps are repeated to stack the waste bodies A in a plurality of rows and a plurality of stages, and by further changing the stationary position and repeating the stationary work. , A plurality of rows and a plurality of stages of waste bodies A are continuously placed in the longitudinal direction of the tunnel.

Although FIG. 2 shows a state in which one carrier is operating, the carriers are arranged in each row and operated simultaneously. Each step is automatically performed by remote control under computer control.

In the present invention as described above, the space 6 for the conventional stationary crane shown in FIG. 3 can be eliminated, and as shown in FIG. Can be stacked higher than before.

Further, since the carrier 11 travels on the traveling rail 10, the reliability of remote operation is greatly improved as compared with a trackless forklift system or the like, and the waste bodies A in each row and each stage are set at the fixed position. Can be quickly and accurately positioned.

Further, the carrier 11 places the waste A on the carrier 15 and lifts it up and down by a lifting mechanism 16 including a link mechanism 16a and a hydraulic jack 16b. Since the transfer of A is performed, there is no need for a counterweight or a large driving device, and the structure becomes very compact and simple.
Reliable and economical as a mechanical and operating system.

Further, by simply pushing in the wastes A to be stacked on top by the wheels 18 on the lower surface of the waste body, the guide grooves 19 on the upper surface of the waste body, and the guide grooves 20 on the loading platform 15, the wastes can be easily and accurately stacked. Can be.

The concrete pit 2 in the tunnel
When the waste A is piled up on the whole and the emplacement is completed,
As described above, the gap between the waste body A and the pit 2 is filled with the filler 4, and the upper space of the tunnel 1 is backfilled with the backfill soil 5. When all emplacement work is completed, the main tunnel, access tunnel, and access tunnel are backfilled, the ground facilities are dismantled and removed, and burial disposal is completed.

The construction method of the tunnel as a disposal space
The shape is not limited to the illustrated example, and may be a hood type by a mountain tunnel method or a shield method. The shape and material of the pit as the storage frame are not limited to the illustrated example.

The present invention is applicable not only to the disposal space of the tunnel type but also to other types of disposal space. Further, the present invention can be applied not only to a buried disposal facility where a storage skeleton and an outer peripheral filler are provided in a disposal space but also to a buried disposal facility where a storage skeleton and an outer peripheral filler are not provided. In addition, the present invention can be applied not only to radioactive waste but also to disposal of other waste.

[0048]

Since the present invention has the above-described configuration, the following effects can be obtained.

(1) The transport trolley is made to travel in the disposal space, and the loading body of the transport trolley is moved up and down to stack the waste, so that the conventional stationary crane can be eliminated and the disposal space can be effectively used. . In particular, in a tunnel-type disposal facility, since there is no space for installing a stationary crane that occupies a large portion of the upper part of the disposal space, the storage efficiency of waste is significantly improved, and the economics of disposal of waste is greatly improved.

(2) Since the carrier for transporting the waste body travels on the guide (track), the reliability of remote operation is significantly improved as compared with the forklift type, and the waste body can be quickly and accurately placed at the predetermined stationary position. And greatly improve safety and workability.

(3) The transporting cart places the waste on the carrier, lifts and lowers it up and down, and pushes the waste with a pushing device. And simple structure, high reliability as mechanical and operating system,
Be economical.

(4) By providing a guide for stationary placement of the waste bodies to be stacked thereon on the upper surface of the waste bodies, it is possible to easily and accurately stack the waste bodies simply by pushing the waste bodies to be stacked thereon. it can.

[Brief description of the drawings]

FIG. 1 shows an example of a tunnel-type buried disposal facility to which the present invention is applied and an example of a stationary facility of the present invention;
(a) is a sectional view of a buried disposal facility, (b) is a perspective view of a stationary facility, and (c) is a perspective view and a side view showing details of a transfer mechanism of the stationary facility.

FIG. 2 is a perspective view showing a method for embedding a waste body according to the present invention in the order of steps.

FIG. 3 is a cross-sectional view showing one example of a conventional waste disposal facility.

[Explanation of symbols]

 A: Waste 1 ... Tunnel 1a ... Shotcrete 1b ... Secondary lining 2 ... Concrete pit 3 ... Peripheral filler (bentonite mixed soil) 4 ... Cement-based filler 5 ... Backfill soil 6 ... Space for stationary crane 10... Running rail 11... Carriage 12... Supporting gantry 12a... Gate type frame 13... Bogie body 14... Wheels 15... Link mechanism 16b ... Hydraulic jack etc. 17 ... Pushing device 18 ... Wheel 19 ... Guide groove 20 ... Guide groove 21 ... Stopper 22 ... Stopper

Claims (5)

[Claims] 1. A stationary method in which wastes are sequentially carried into a disposal space, and the wastes are stacked and placed at a predetermined stationary position in the disposal space, and are transported on guides provided on the bottom surface of the disposal space. The wastes are sequentially transported by the trolley, and at a predetermined fixed position, the wastes on the carrier of the transport trolley are transferred onto the support gantry, and the waste on the carrier is raised by raising the carrier of the transport trolley on the support gantry. A method for placing a waste body, wherein the method is to transfer the waste body to a waste body. 2. The method of placing a waste body according to claim 1, wherein the disposal space is a disposal tunnel excavated in rock. 3. The method for placing a waste body according to claim 1 or 2, wherein a storage body for the waste body is provided in the disposal space, and the waste body is stacked and placed at a predetermined stationary position in the storage body. A method for embedding a waste body. 4. A stationary equipment for sequentially transporting wastes into a storage skeleton in a disposal space, stacking the wastes in a predetermined position in the storage skeleton, and placing the wastes on a guide provided on a bottom surface of the storage skeleton. Having a support trolley installed on the bottom of the storage skeleton at the stationary position and supporting a waste body,
What is claimed is: 1. A facility for placing a waste body, comprising: a carrier that can be raised and lowered; and a transfer device that transfers the waste body on the carrier to a waste body at a stationary position or onto a support base. 5. A facility for placing a waste body according to claim 4, wherein a guide for guiding a lower surface of the waste body is provided on an upper surface of the waste body.