JP4066524B2 - Shock absorber construction equipment for disposal of solidified glass - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a buffering material construction apparatus for disposal of a glass solidified material layer used for constructing a buffering material in a disposal tunnel when a vitrified material of high-level radioactive waste stored in an overpack is buried in the ground and disposed of. It is about.
[0002]
[Prior art]
Among radioactive wastes generated at nuclear power plants, high-level radioactive wastes with residual radioactivity exceeding the specified export value are melted together with glass raw materials and confined in glass components to be vitrified. As a vitrified body, it is necessary to manage it strictly for many years until it is disposed of at a point of about 1,000 meters underground and repeatedly undergoes natural collapse and the radioactive level drops below the standard value.
[0003]
When the vitrified waste is disposed of, the shaft b is dug from the ground facility a to a position of about 1000 meters underground, as shown in Fig. 5 (b) (b). Excavating the main tunnel d so as to extend laterally from the lower end of the vertical shaft b, and excavating a number of cylindrical disposal tunnels c so as to branch from the main tunnel d, The vitrified body e obtained by vitrifying the high-level radioactive waste is embedded in a state where it is stored in the overpack f. At this time, the overpack f is removed from the ground pressure acting in the embedded state. For the purpose of protection, after a clay-like cushioning material g mainly composed of bentonite is applied to the inner wall of the disposal mine channel c with a required thickness, an overpack f is inserted into a region surrounded by the cushioning material g. Is planned to
[0004]
As a means for constructing the cushioning material g in the disposal tunnel c, as shown in FIG. 6 (a), a cylindrical body h in which the cushioning material is compression-molded so as to be integrated on the ground is disposed as shown in FIG. An integrated buffer material construction method in which the buffer material is constructed in the disposal tunnel c by carrying it in and installed, or a segment in which the buffer material is compression molded on the ground as shown in FIG. Block-type buffer material construction method in which a block-like block i is carried into the disposal mine channel c and assembled into a cylindrical shape so that the buffer material is constructed in the disposal mine channel c, or construction in the disposal mine channel c There has been proposed a spraying method or the like in which powder or granular cushioning material is directly sprayed at a high pressure, and compaction with a tamper or the like is performed as an auxiliary.
[0005]
[Problems to be solved by the invention]
However, in the case of the integrated buffer material construction method, the cylinder h that has been compression-molded on the ground is carried into the disposal tunnel c, but the clearance between the cylinder h and the disposal tunnel c is several centimeters. Since it is as narrow as about a meter, there is a problem that a special technique is required to carry the cylindrical body h into the disposal mine channel c. In the case of a block type buffer material construction method, when assembling into a cylindrical shape, If a gap occurs between the contact surfaces of the blocks i, there is a possibility that groundwater may enter inside, and the spray construction method has a problem that it takes a long time to construct the cushioning material.
[0006]
Therefore, the present invention can eliminate the need to carry the compression molded body of the buffer material into the disposal tunnel, and install the buffer material in the disposal tunnel in a short time so that there is no risk of ingress of groundwater inside. An object of the present invention is to provide a shock absorber construction apparatus for disposal of vitrified solid bodies.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a cart that can travel in a disposal tunnel excavated in a lateral direction to dispose of the vitrified material stored in an overpack. A shock absorber filling device that supplies and fills the side end region with powder or granular cushioning material, and an axial compression device that compresses the filled powder or granular cushioning material in the axial direction of the disposal tunnel And a radial compression device that compresses the axially compressed powder or granular cushioning material in the radially outward direction.
[0008]
After the carriage is moved and positioned in the rear end region in the disposal mine shaft, powder or granular buffer material is supplied and filled in the rear end region by the buffer material filling device, and then the axial compression device The powder or granular cushioning material is compressed in the axial direction, and further, the powder or granular cushioning material is compressed radially outward by a radial compression device. Thereby, the buffer material of a predetermined | prescribed compression density can be easily constructed on-site.
[0009]
Further, the buffer material filling apparatus, and a storage tank for containing the powder or granular cushioning material, for powder pumping of the powder or granular cushioning material of the housing within the tank so as to discharge from the discharge nozzle through a supply pipe A support cylinder having a structure including a pump, and an axial compression device projecting forward from the front end of the carriage, and an outer periphery of the support cylinder so that the actuator can be pushed and pulled by an actuator to slide in the axial direction of the disposal tunnel A front end frame having an axial compression plate fitted to the portion and having a radial compression device attached to the front end surface of the support cylinder with a diameter smaller than the support cylinder, and an actuator on the outer periphery of the front end frame with comprising a radial compression plate disposed circumferential split structure so as to be movable in the radial direction by the configuration, disposition pit powder or granular cushioning material Loading of the inner, the two directions of compression of powder or granular buffer material can be easily and reliably.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
FIGS. 1 (a) and (b) show an embodiment of the buffer material construction apparatus for vitrified geological disposal of the present invention, and the same disposal as the disposal mine c shown in FIGS. 5 (a) and (b) Cushioning material for filling a self-propelled bogie 2 that travels in the mine shaft 1 with wheels 3 into the rear end region in the disposal mine shaft 1 with powder or granular cushioning material 4 A filling device 5, an axial compression device 6 for compressing the powder or granular cushioning material 4 after filling in the axial direction, and a radially compressed powder or granular cushioning material 4 radially outward And a radial compressing device 7 for compressing towards.
[0012]
The buffer material filling device 5, a hopper-shaped storage tank 8 mounted on the carriage 2 in order to house the powder or granular cushioning material 4, the cushioning material 4 of the powder or granular in said storage tank 8 A powder pump 9 for pumping to the supply pipe 11 and a discharge nozzle attached to the tip of the supply pipe 11 for discharging the powder or granular cushioning material 4 pumped into the supply pipe 11 forward 10, the cart 2 is moved to the rear end region of the disposal mine 1, and the powder or granular buffer material 4 in the storage tank 8 is pumped into the supply pipe 11 by the powder pumping pump 9. However, the discharge nozzle 10 at the tip can be discharged.
[0013]
The axial compression device 6 is provided with a cylindrical support cylinder 12 protruding from the front end of the carriage 2 so as to be substantially coaxial with the disposal tunnel 1, and on the outer periphery of the support cylinder 12, the disposal tunnel. An annular axial compression plate 13 having a size corresponding to the diameter of 1 is fitted so as to be slidable back and forth along the axial direction of the disposal mine shaft 1, and the axial compression plate 13 At the front end portion of the carriage 2 at the rear position, a fluid pressure cylinder 14 such as hydraulic pressure is installed as an actuator for pushing and pulling the axial compression plate 13 back and forth and sliding it in the axial direction. is there.
[0014]
The discharge nozzle 10 of the buffer material filling device 5 is disposed so as to penetrate the small hole 15 provided at the upper position of the axial compression plate 13 of the axial compression device 6, and the axial compression plate 13 When being pushed and pulled back and forth, it is possible to slide with respect to the small hole 15, and when the axial compression plate 13 is displaced to the foremost position, the tip position is accommodated in the small hole 15. is there.
[0015]
Further, the radial compression device 7 concentrically protrudes from the front end surface of the support drum 12 of the axial compression device 6 with a cylindrical tip frame 16 having a diameter smaller than that of the support drum 12. In addition, a radial compression plate 18 having a circumferential multi-part structure extending along the axial direction of the disposal mine shaft 1 is disposed on the outer periphery of the distal end frame 16, and the radial compression plates 18 are further arranged in the radial direction. A fluid pressure cylinder 17 such as a hydraulic pressure as an actuator for expanding and contracting to the distal end frame 16 is assembled in a radial manner.
[0016]
The radial compression device 7 is protruded from the axial compression device 6 by a length corresponding to the length of the overpack of the vitrified body, and each of the fluid pressure cylinders 17 for the radial compression is provided. At the time of contraction, the radial compression plates 18 are alternately overlapped with each other in the circumferential direction and are in contact with each other to prevent intrusion of the powder or granular cushioning material 4 into the inside. The outer diameter formed by the radial compression plate 18 is set to be smaller than or equal to the outer diameter of the support cylinder 12 of the axial compression device 6, while the fluid pressure cylinder 17 for each radial compression is extended. As shown by a two-dot chain line in FIG. 1 (b), the overlapping of the radial compression plates 18 is eliminated, and a cylindrical body shape having a diameter corresponding to the outer diameter of the overpack of the vitrified body is formed. And Aru.
[0017]
In the above configuration, when the powder or granular cushioning material 4 is constructed in the disposal tunnel 1 for embedding the vitrified body, first, as shown in FIG. 2 (a), a fluid pressure cylinder 14 for axial compression is used. In the state where the distal end portion of the radial compression device 7 is confronted with a predetermined distance from the rear end surface of the disposal tunnel 1 in a state where the fluid pressure cylinders 17 for radial compression are contracted, respectively. Then, the cart 2 is moved forward and stopped, so that the buffer material filling space 19 is formed in the rear end region of the disposal tunnel 1 partitioned by the axial compression plate 13.
[0018]
Next, as shown in FIG. 2 (b), the powder or granular cushioning material 4 stored in the storage tank 8 is pumped into the supply pipe 11 by the powder pressure pump 9, and the supply pipe 11 Through the discharge nozzle 10, the buffer material filling space 19 is discharged and filled.
[0019]
Thereafter, as shown in FIG. 2C, the axial compression fluid pressure cylinder 14 of the axial compression device 6 is extended to push the axial compression plate 13 forward. As a result, the powder or granular cushioning material 4 is compressed in the axial direction. Next, as shown in FIG. 2 (d), the radial compression fluid pressure cylinder 17 of the radial compression device 7 is extended to push out the radial compression plate 18 in the diameter expansion direction. As a result, the powder or granular cushioning material 4 is further compressed, and as a result, the cushioning material 4 a having a predetermined compression density is applied in the disposal tunnel 1.
[0020]
After the buffer material 4a is applied, as shown in FIG. 2 (e), the radial compression fluid pressure cylinder 17 is contracted to return the radial compression plate 18 to the reduced diameter state, and the axial compression is performed. The hydraulic pressure cylinder 14 is contracted and the axial compression plate 13 is retracted to the original position, and then the carriage 2 is moved backward to be retracted from the disposal tunnel 1. As a result, as shown by a two-dot chain line in FIG. 2 (e), a recess 20 for embedding the overpack 21 of the vitrified body is formed inside the cushioning material 4a. Therefore, after accommodating the overpack 21 of the glass solidified body in the recess 20, the buffer material 4 a can be sequentially applied in the disposal tunnel 1 by repeating the same procedure as described above, and the glass The solidified body can be buried.
[0021]
In the above, since the powder or granular cushioning material 4 is carried into the disposal tunnel 1 using the storage tank 8 mounted on the carriage 2, no special technique is required, and the inner surface of the disposal tunnel 1 is not required. Since the compression material 4a is compressed from the powder or granular cushioning material 4 so as to be pressed against the surface of the material, there is no gap in the compression molded cushioning material 4a, thereby preventing the entry of groundwater. Further, the flow rate of the powder or granular buffer material 4 is ensured by using a powder pressure pump 9 and the buffer material 4a is applied on-site by batch compression combining axial and radial compression. The construction time can be shortened.
[0022]
Next, FIGS. 3 (a) and (b) show another embodiment of the present invention, and the vitrified solid material disposal buffer material construction is the same as that shown in FIGS. 1 (a) and (b). In the apparatus, instead of making the radial compression plate 18 in the radial compression apparatus 7 overlap in a reduced diameter state, when the hydraulic cylinder 17 for radial compression is operated to extend, FIG. As shown by the alternate long and two short dashes line in (b), each radial compression plate 18 forms an intermittent cylindrical shape having a diameter corresponding to the overpack of the vitrified body, and the radial compression described above. The distal end frame 16 of the apparatus 7 is separated from the support cylinder 12 of the axial compression apparatus 6, and an electric motor 22 is assembled to the axial center of the support cylinder 12, and the distal end frame 16 is connected to the shaft of the electric motor 22. , Electric motor 22 It is obtained by allowing rotation of the radial compression device 7 in driving. In addition, the same reference numerals are given to the same components as those shown in FIGS.
[0023]
According to the present embodiment, the axial compression plate is used to compress the powder or granular cushioning material 4 filled in the cushioning material filling space 19 by the same procedure as shown in FIGS. 2 (a), (b), and (c). after compressed in the axial direction by 13, as shown in FIG. 4 (a), a fluid pressure cylinder 17 for radially compressive by extending action, first, powder or granular located outward in the radial direction the compression plate 18 Next, after compressing the shock absorbing material 4 and then contracting the fluid pressure cylinder 17 for radial compression as shown in FIG. 4 (b), the motor 22 is used to move the radial compression device 7 to the required angle (see FIG. 4). Then, as shown in FIG. 4 (c), the buffer cylinder 4a having a predetermined compression density is disposed in the disposal tunnel 1 by re-elongating the fluid pressure cylinder 17 for radial compression. Can be compression molded.
[0024]
The present invention is not limited to the above embodiment, and the support cylinder 12 of the axial compression device 6 is not limited to a cylindrical shape, and may be a rectangular tube shape. Also, the axial compression device 6 Although the fluid pressure cylinders 14 and 17 are used as actuators of the radial compression device 7, a drive device such as an electric jack may be used, and the discharge nozzle 10 is connected to the axial compression plate 13. Although shown as a type of penetrating the small hole 15 that has been drilled, it may be embedded in the outer wall portion of the support barrel 12 of the axial compression device 6, and various other modifications may be made without departing from the scope of the present invention. Of course, changes can be made.
[0025]
【The invention's effect】
As described above, according to the buffer material construction apparatus for disposal of a vitrified solid body of the present invention, the following excellent effects are exhibited.
(1) the overpack vitrified were housed in the bogie to be able to travel in the disposal tunnel was drilled laterally to geological disposal, powder or granular rear side end region of the disposal in tunnel A buffer material filling device for supplying and filling the buffer material, an axial compression device for compressing the filled powder or granular buffer material in the axial direction of the disposal tunnel, and an axially compressed powder Or since it is set as the structure equipped with the radial direction compression apparatus which compresses a granular buffer material toward a radial direction outward direction, the buffer material of a predetermined | prescribed compression density can be easily constructed on the spot.
(2) The buffer material filling device is configured to store a powder or granular buffer material in a storage tank and to discharge the powder or granular buffer material in the storage tank from a discharge nozzle through a supply pipe. By using the configuration comprising the pump for use, a special technique required for carrying the compression molded body into the disposal tunnel can be eliminated.
(3) The axial compression device is fitted on the outer periphery of the support cylinder so that it can slide in the axial direction of the disposal tunnel by pushing and pulling with the support cylinder protruding forward from the front end of the carriage. A tip frame comprising a plate for axial compression and a radial compression device attached to the front end surface of the support cylinder with a diameter smaller than the support cylinder, and moved radially by an actuator on the outer periphery of the tip frame By using a configuration comprising a radially compressing plate with a circumferentially divided structure arranged as possible, it is possible to ensure compression molding of powder or granular cushioning material by batch compression combining axial and radial compression Since it can be performed, infiltration of groundwater can be prevented and construction can be performed in a short time.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows an embodiment of a buffer material construction apparatus for disposal of a vitrified solid body according to the present invention, in which (A) is a partially cut side view, (B) is a view taken along the line I-I in (A). It is.
FIG. 2 shows a procedure for constructing a buffer material in the disposal tunnel using the apparatus of the present invention shown in FIG. 1, and (a) shows a state in which the carriage is advanced to the rear end of the disposal tunnel. Outline diagram, (B) is a schematic diagram showing a state where powder or granular cushioning material is filled in a cushioning material filling space, (C) is a schematic diagram showing a state where powder or granular cushioning material is compressed in the axial direction (D) is a schematic diagram showing a state in which the cushioning material is further compressed in the radial direction, and (e) is a schematic diagram showing a state in which the carriage is retracted and retreated from the disposal tunnel.
FIGS. 3A and 3B show another embodiment of the present invention, where FIG. 3A is a partially cut side view, and FIG. 3B is a view taken along the line II-II in FIG.
4 shows a working state by the apparatus shown in FIG. 3, and (a), (b), and (c) are all schematic views of the process of compressing the cushioning material.
FIG. 5 shows an example of a conventional plan for geological disposal of vitrified bodies. (A) is an overall schematic diagram, and (B) is an enlarged view of part III of (A).
6A and 6B show a buffer material construction method in a disposal tunnel proposed so far. FIG. 6A is a schematic perspective view when a cylindrical body made of an integrally formed buffer material is used, and FIG. It is a schematic perspective view at the time of using the segment-shaped block made from material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disposal tunnel 2 Bogie 4 Powder or granular buffer material 5 Buffer material filling device 6 Axial compression device 7 Radial compression device 8 Storage tank 9 Powder pumping pump 10 Discharge nozzle 11 Supply pipe 12 Supporting cylinder 13 Axial compression Plate 14 Fluid pressure cylinder (actuator)
16 Tip frame 17 Fluid pressure cylinder (actuator)
18 Plate for radial compression 21 Overpack

Claims (3)

The vitrified were housed in overpack the bogie to be able to travel in the disposal tunnel was drilled laterally to geological disposal, powder or granular cushioning material on the back side end region of the disposal in tunnel A buffer material filling device for supplying and filling the powder, a powder or granular buffer material after filling in the axial direction of the disposal tunnel, and an axially compressed powder or granular material A shock absorber construction device for disposal of a vitrified solid body, characterized by comprising a radial compression device that compresses the shock absorber in the radially outward direction. The buffer material filling apparatus, and a storage tank for containing the powder or granular cushioning material, and the powder feeding pump for the powder or granular cushioning material of the housing within the tank so as to discharge from the discharge nozzle through a supply pipe The shock absorber construction device for disposal of a vitrified solid body according to claim 1, wherein the construction is composed of:   Axial compression device fitted to the outer periphery of the support cylinder so that it can slide in the axial direction of the disposal tunnel by pushing and pulling it with an actuator. And a radial compression device attached to the front end surface of the support cylinder with a diameter smaller than that of the support cylinder, and an outer periphery of the tip frame can be moved in the radial direction by an actuator. The buffering material construction apparatus for vitrification disposal of a vitrified body according to claim 1 or 2, comprising a radially compressing plate having a circumferentially divided structure.

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