JP6093603B2 - Rebound material recovery device, rebound material recovery method, and rebound material reuse method - Google Patents

Description

  The present invention relates to a rebound rebound material recovery device, a rebound material recovery method, and a rebound material reuse method that occur during spraying in a bentonite-based material spraying method.

  Conventionally, a recovery device 301 as shown in FIG. 8 is known as a technique for recovering a rebound material at the time of spraying a bentonite material. In addition, since the collection | recovery apparatus 301 of such a structure is generally prepared separately at a work site, the patent document etc. with which the collection | recovery apparatus 301 was described do not exist. The recovery device 301 includes a main body 305 having an inlet 305 a for rebound material, a bag-like flexible container 307 that is replaceably attached to the lower portion of the main body 305, and a cloth cylindrical filter 309 that is attached to the upper portion of the main body 305. And is composed of.

  In the recovery method using the recovery device 301, the rebound material B is transported from the place where the rebound material B is generated by an air transporter (not shown), and is introduced into the recovery device 301 from the introduction port 305a together with air. Thereafter, as indicated by an arrow C, the rebound material B collides with a collision plate 305b provided in the main body 305, falls into the flexible container 307, and is collected. The recovered rebound material B can be reused as a bentonite material. On the other hand, the air introduced into the recovery device 301 together with the rebound material B is discharged to the outside through the cloth tubular filter 309.

  In the recovery device 301 described above, the air introduced together with the rebound material B from the inlet 305a flows in the flexible container 307 after colliding with the collision plate 305b and before being discharged through the cloth cylindrical filter 309. . If it does so, since the rebound material B collected in the flexible container 307 will be in the state always exposed to the flowing air, the rebound material B will be easy to dry and will cause the fall of a moisture content. As a result, the rebound material B may become difficult to reuse due to insufficient moisture content.

  In view of this problem, an object of the present invention is to provide a rebound material recovery device, a rebound material recovery method, and a rebound material reuse method that can suppress drying of the recovered rebound material.

  The rebound material recovery device of the present invention is a rebound material recovery device for recovering rebound material generated at the time of spraying in a bentonite-based material spraying method used for construction of a surplus depth disposal facility for radioactive waste, A suction device that sucks rebound material from the point where the material falls, an air transport device that transports the rebound material sucked by the suction device by air, and an introduction space where the rebound material transported by the air transport device is introduced together with air A dust collector that separates the rebound material in the introduction space from the air and discharges it from the discharge port by gravity, and a receiving means that receives the rebound material discharged from the dust collector, and the dust collector is forced from the introduction space to the outside. It is characterized by having exhaust means for exhausting air.

  According to this collection device, in the dust collector introduction space, the rebound material is discharged from the discharge port, while the air introduced together with the rebound material is forcibly discharged from the introduction space to the outside by the exhaust means. Therefore, less air is directed from the introduction space to the rebound material of the receiving means through the discharge port, and as a result, drying of the rebound material can be suppressed.

  The receiving means may be detachable from the discharge port of the dust collector and has a storage unit that stores the rebound material from the discharge port, and the dust collector may have a caster located below the attached storage unit. . According to this configuration, the dust collector with the storage portion attached can be easily moved to a desired location.

  Further, the receiving means may be a material supply machine that supplies the rebound material to a spraying machine that sprays the bentonite material. According to this structure, a rebound material can be sent into a spraying machine via a material supply machine, and a rebound material can be directly reused for spraying.

  The rebound material recovery method of the present invention is a rebound material recovery method for recovering a rebound material generated at the time of spraying in a bentonite-based material spraying method used for construction of a surplus depth disposal facility for radioactive waste, Using any one of the rebound material recovery devices, the rebound material is recovered by the receiving means. According to this rebound material recovery method, drying of the recovered rebound material is suppressed by using the rebound material recovery device.

  The rebound material recovery method of the present invention is a rebound material recovery method for recovering a rebound material generated at the time of spraying in a bentonite-based material spraying method used for construction of a surplus depth disposal facility for radioactive waste, The rebound material storage step of storing the rebound material in the storage portion using the rebound material recovery device, and the transfer capability of the air transfer machine so that the pressure in the storage portion is substantially equal to the atmospheric pressure in the rebound material storage step And a balance adjusting step for adjusting the balance between the exhaust means and the exhaust capacity of the exhaust means. According to this configuration, the air introduced into the dust collector introduction space is discharged from the exhaust means with almost no excess or deficiency, so that the flow of air between the storage unit and the dust collector can be further suppressed.

  In this case, more specifically, the rebound material recovery device includes pressure monitoring means for monitoring the pressure in the reservoir, and in the balance adjustment step, the balance is adjusted based on the monitoring result by the pressure monitoring means. It is good.

  The rebound material reuse method of the present invention is a rebound material reuse method for reusing the rebound material generated at the time of spraying in the method of spraying bentonite materials used for construction of a surplus depth disposal facility for radioactive waste. In addition, the rebound material recovery is performed by spraying the bentonite-based material from the spray nozzle of the sprayer and collecting almost all of the rebound material generated in the spraying process by any of the rebound material recovery methods described above. Rebound material transporting process for supplying the rebound material collected in the rebound material recovery process to the material supply machine for supplying the rebound material to the spraying machine, and the rebound material supplied from the material supply machine in the spraying machine A material transfer step of transferring a bentonite-based material to a spray nozzle, a spraying step, a rebound material recovery step, Bound material carrying step, and a material transfer process, and performing simultaneously in parallel.

  In the rebound method, almost all of the rebound material generated in the rebound material recovery step is recovered, and therefore smooth and continuous reuse is possible without accumulating the rebound material remaining at the falling point. In the rebound material recovery step, drying of the recovered rebound material is suppressed by using the above-described rebound material recovery method.

  ADVANTAGE OF THE INVENTION According to this invention, the rebound material collection | recovery apparatus which can suppress the drying of the collect | recovered rebound material, the rebound material collection method, and the rebound material reuse method can be provided.

It is sectional drawing which shows an example of the structure to which the rebound material collection | recovery apparatus of this invention, the rebound material collection method, and the rebound material reuse method are applied at the time of construction. It is a partially broken perspective view of the structure of FIG. It is a side view showing a 1st embodiment of a spraying device to which a rebound material recovery device, a rebound material recovery method, and a rebound material reuse method of the present invention are applied. It is a front view which shows the spraying apparatus of FIG. It is a side view which shows the rebound material collection | recovery apparatus of 1st Embodiment. It is sectional drawing which shows the dust collector and flexible container of FIG. It is a side view which shows the rebound material collection | recovery apparatus of 2nd Embodiment. It is sectional drawing which shows the conventional rebound material collection | recovery apparatus.

  Hereinafter, embodiments of a rebound material recovery device, a rebound material recovery method, and a rebound material reuse method according to the present invention will be described in detail with reference to the drawings. In each drawing, each part may be exaggerated to facilitate understanding of the description, and thus the dimensional ratio on the drawing does not necessarily match the actual one.

[First Embodiment]
First, referring to FIG. 1 and FIG. 2, as an example of a structure in which the rebound material recovery device, the rebound material recovery method, and the rebound material reuse method of the present embodiment are used for construction, a marginal disposal of radioactive waste The facility 101 will be described.

  A surplus depth disposal facility 101 for radioactive waste shown in FIGS. 1 and 2 is a facility for performing geological disposal of radioactive waste having a relatively high radioactivity level among low-level radioactive waste. The waste body 103 to be treated in the facility 101 is formed by sealing radioactive waste in a steel container and is accommodated in the tunnel 105. A filler 107 is filled in a gap between the waste bodies 103, and a concrete pit 109, a low diffusion layer 111, and a buffer layer 113 are formed in order so as to surround the periphery in multiple layers. A backfill layer 115 is provided in the space between the buffer layer 113 and the wall surface of the tunnel 105.

  In the following, as shown in the figure, an XYZ coordinate system is set in which the X axis is taken in the width direction of the tunnel 105, the Y axis is taken in the longitudinal direction of the tunnel 105 (direction perpendicular to the paper surface in FIG. 1), and the Z axis is taken in the vertical direction. In addition, X, Y, and Z are used to describe the positional relationship of each component. In addition, in the case of using a phrase having the concept of “front and back” such as “front” and “back”, the + Y direction is “front” and the −Y direction is “back”.

  The buffer layer 113 of the facility 101 is formed of bentonite and functions as a water shielding layer. Of the buffer layer 113, the side buffer layer 113a which is a side wall portion parallel to the YZ plane is applied by a spraying method using the spraying device 1 (FIG. 3). For example, the dimension of the side buffer layer 113a is 1 m in the X direction, 130 m in the Y direction, and 8 m in the Z direction. At the time of construction of the side buffer layer 113a, the low diffusion layer 111 and the portion of the backfill layer 115 adjacent to the side buffer layer 113a in the X direction have already been completed. Therefore, in the construction of the side buffer layer 113a, work in a narrow space between the low diffusion layer 111 and the backfill layer 115 is forced, and heavy machinery or the like cannot be used. Further, since the side buffer layer 113a needs to be compacted with a high density of bentonite, a bentonite spraying method is preferably employed. Hereinafter, the above-mentioned space (a space of 1 m in width, 130 m in length, and 8 m in height) that is planned to be filled with bentonite as the side buffer layer 113a is referred to as “planned filling space” and is denoted by a symbol “R”. Shall.

  The spraying apparatus 1 is demonstrated with reference to FIG.3 and FIG.4. As shown in the figure, the spraying device 1 includes a hoist 5, a spraying main body 3, and a spraying material supply unit 17. The spray body 3 is suspended in the planned filling space R by the hoist 5 via the wire 7. Above the planned filling space R, a rail 9 extending in the Y direction and supporting the hoist 5 is provided. The hoist 5 is guided by the rail 9 and is movable in the Y direction. Furthermore, when the hoist 5 winds up / unwinds the wire 7, the spraying main-body part 3 moves up and down. With the above configuration, the spray body 3 is movable in the Y and Z directions within the planned filling space R.

  The spraying material supply unit 17 is a part that supplies bentonite (bentonite-based material) to the spraying main body 3 through the tube 15. The spray material supply unit 17 includes a known sprayer 17a used in a normal spraying method, a compressor 17b that supplies spray pressure to the sprayer 17a, and a material supply that supplies bentonite to the sprayer 17a. Machine 17c.

  The spray body 3 is a portion that injects bentonite to the front end face 11. The end face 11 is a wall surface of the buffer layer 113 that is parallel to the XZ plane provided in front of the side buffer layer 113a. By repeatedly spraying bentonite on the end face 11 and stacking it to a thickness of 130 m, the side buffer layer 113a having a length of 130 m in the Y direction is finally completed.

  The spray body 3 includes a hanging jig 21 on which the wire 7 is hung, a robot arm 23 attached to the lower surface of the hanging jig 21, a nozzle unit 25 attached to the arm tip of the robot arm 23, It has. The base side of the robot arm 23 is fixed to the lower surface of the hanging jig 21, and an arm having a multi-joint extends downward. The nozzle unit 25 includes a spray nozzle 31 that ejects bentonite. A control computer (nozzle control unit) 27 for controlling the robot arm 23 is mounted on the upper surface of the hanging jig 21. The robot arm 23 operates based on a control signal from the control computer 27, and can freely change the posture and position of the nozzle unit 25. That is, the robot arm 23 functions as an actuator that drives the nozzle unit 25 and determines the posture and position of the nozzle unit 25.

  The robot arm 23 can be manually operated by an operator by operating a manual controller connected to the control computer 27. A series of operations by the above-described manual operation can be stored in the control computer 27 as a program, and the same operation according to the program can be repeatedly reproduced.

  Guide rollers 29 are attached to the hanging jig 21 so as to project on both sides in the X direction. By swinging the pair of guide rollers 29 against the walls on both sides, the swinging of the spray body 3 due to the spray pressure or the like is suppressed. A camera 30 that captures a front image is attached to the front end face of the hanging jig 21. The camera 30 transmits the captured image to the control computer 27 as an image signal. The control computer 27 may use the image captured by the camera 30 for operation control of the robot arm 23.

  In the spray device 1 described above, since the movement of the nozzle unit 25 is controlled using the robot arm 23, it is possible to always perform the injection in the appropriately controlled injection direction and the injection distance to reduce the generation of the rebound material. it can.

  However, since a certain amount of rebound material is generated, it is desired to collect it and reuse it as a spray material. Hereinafter, a rebound material recovery device, a rebound material recovery method, and a rebound material reuse method for reusing the rebound material generated during spraying by the spraying device 1 will be described.

  FIG. 5 is a view showing a state where the rebound material recovery device 51 is combined with the above-described spraying device 1. As shown in FIG. 5, the rebound material recovery device 51 includes a suction device 53, an air conveyance device 55, a dust collector 57, and a flexible container (storage unit) 59. The suction device 53 includes a suction nozzle that is manually operated by the worker H, and sucks the rebound material B that has dropped to the drop position in front of the spray surface 12. The air conveyance device 55 conveys the rebound material B from the suction device 53 together with the air supplied from the compressor (not shown), and a known air conveyance device can be used. The rebound material B and air are sent to the dust collector 57 through the transport hose 56 by the air transport machine 55. The dust collector 57 separates the introduced rebound material B from air and discharges it downward by gravity. The flexible container 59 stores the rebound material B discharged from the dust collector 57.

  As shown in FIG. 6, the dust collector 57 has a metal main body 61 that defines the introduction space D. A conical portion 61a having a conical shape with a reduced diameter is formed at the lower portion of the main body portion 61, and a discharge port 63 is provided at the lower end of the conical portion 61a. A check valve 63 a is attached to the discharge port 63, and backflow of air or the like from the outside to the introduction space D is prevented. Moreover, the flexible container 59 arrange | positioned under the cone part 61a is attached to the discharge port 63 so that attachment or detachment is possible. An introduction port 65 for introducing the rebound material from the transport hose 56 is provided on the side surface of the main body 61 at a position slightly above the conical part 61a. An exhaust port 67 is provided on the upper side surface of the main body 61, and a turbo fan (exhaust means) 69 is connected to the outside of the exhaust port 67. In the introduction space D, a filter 75 that partitions between the introduction port 65 and the exhaust port 67 is installed.

  The dust collector 57 has a frame portion 71 that supports the main body portion 61. The frame portion 71 has a plurality of legs 71a extending below the flexible container 59, and casters 73 are attached to the lower ends of the legs 71a. A control panel 77 for controlling the turbo fan 69 is also attached to the frame portion 71. Due to the presence of the caster 73 as described above, the dust collector 57 with the flexible container 59 attached can be easily moved to a desired location.

  The operation of the dust collector 57 is as follows. The rebound material B from the air conveyance device 55 is introduced into the introduction space D through the introduction port 65 together with air. The rebound material B is introduced at a high speed along the tangential direction of the inner surface of the main body 61, and is separated from the air while spirally rotating along with the air along the inner surface of the conical portion 61a. Move. Thereafter, the rebound material B passes through the check valve 63 a and is discharged downward from the discharge port 63. The rebound material B discharged from the discharge port 63 is accumulated in the flexible container 59. On the other hand, the air sent into the introduction space D together with the rebound material B moves upward by the suction of the turbo fan 69 as indicated by the arrow A, and after the solid component is removed by the filter 75, the exhaust gas is exhausted. The air is forcibly exhausted from the port 67 to the outside.

  Then, the rebound material collection | recovery method using the above rebound material collection | recovery apparatuses 51 and the rebound material reuse method are demonstrated. In the rebound material reuse method of the present embodiment, the spraying process, the rebound material recovery process, the rebound material transport process, and the material transfer process described below are performed in parallel.

(Blowing process)
As shown in FIG. 5, while controlling the robot arm 23 using the spraying device 1, bentonite is sprayed on the spraying surface 12 (the bentonite layer 11 or the bentonite layer laminated on the facing surface 11). Go. At this time, a certain amount of the rebound material B is generated and falls downward on the near side of the spraying surface 12.

(Rebound material recovery process)
As shown in FIG. 5, the operator H operates the suction nozzle of the suction device 53 to suck the rebound material B at the dropping point. In addition, it is preferable to process the rebound material B of a fall point here at a speed faster than the speed which the rebound material B generate | occur | produces by adjusting the output of the air conveyance machine 55 here. According to this process, almost all of the rebound material B is recovered with the capability of recovering the entire amount of the rebound material B that has been generated. Therefore, the rebound material B remaining at the falling point is not accumulated and is smoothly and continuously collected. Recovery becomes possible.

  The sucked rebound material B is pressure-fed through the conveyance hose 56 by the air conveyance device 55. Thereafter, the rebound material B sent to the dust collector 57 together with the air is separated from the air by the dust collector 57 and stored in the flexible container 59 through the discharge port 63 (rebound material storage step). On the other hand, the air sent to the dust collector 57 is forcibly discharged to the outside of the dust collector 57 by the turbo fan 69. Here, the exhaust capacity of the turbo fan 69 may be adjusted to be larger than the transport capacity of the air transport machine 55. According to such adjustment, almost no air is discharged from the discharge port 63 of the dust collector 57. Further, in the rebound material recovery step, a balance adjustment step described below may be executed.

(Balance adjustment process)
In the balance adjustment step, a pressure gauge (pressure monitoring means) 59c is installed in advance in the upper part of the flexible container 59. The pressure gauge 59c detects the pressure inside the flexible container 59 (monitor result). While monitoring the pressure gauge 59c, the balance between the conveyance capability of the air conveyance device 55 and the exhaust capability of the turbofan 69 is adjusted so that the pressure inside the flexible container 59 becomes equal to the atmospheric pressure. According to this adjustment, almost no air enters and exits between the dust collector 57 and the flexible container 59, and the air introduced into the dust collector 57 is discharged via the exhaust port 67 with almost no excess or deficiency. The exhaust capacity of the turbo fan 69 is adjusted manually by an operator by operating an operation panel provided on the control panel 77 (FIG. 6), for example.

(Rebound material transport process)
The flexible container 59 is removed from the dust collector 57, and the accumulated rebound material B is put into the hopper 17d of the material feeder 17c.

(Material transfer process)
The rebound material B introduced into the hopper 17d is mixed with new bentonite introduced into the hopper 17d by another route, and supplied as a spraying material from the material supply machine 17c to the spraying machine 17a. Then, the spray material is transferred from the spray machine 17a to the spray nozzle 31 through the tube 15 by the pressure of the compressor 17b (FIG. 3), and is sprayed from the spray nozzle 31 toward the spray surface 12. .

  Then, the effect by the rebound material collection | recovery apparatus 51 demonstrated above, the rebound material collection method, and the rebound material reuse method is demonstrated.

  According to the rebound material recovery device 51, the rebound material recovery method, and the rebound material reuse method, in the introduction space D of the dust collector 57, the rebound material B is discharged from the discharge port 63, but introduced together with the rebound material B. The air thus forced is forcibly discharged from the introduction space D to the outside by the turbo fan 69. Accordingly, the amount of air traveling from the introduction space D to the rebound material B in the flexible container 59 through the discharge port 63 is reduced. As a result, the wind which hits the rebound material B from the dust collector 57 is suppressed, and drying of the rebound material B can be suppressed. And by suppressing drying, the water content ratio of the rebound material B can be ensured to an extent suitable for reuse as a spraying material.

  In particular, when the above-described balance adjustment process is performed, air hardly enters and exits between the dust collector 57 and the flexible container 59, so the flow of air in the flexible container 59 is suppressed, and the rebound material B is dried. It is reduced more.

  Further, in the rebound material recovery step, almost all of the generated rebound material B is recovered, so that the rebound material remaining at the dropping point can be smoothly reused without being accumulated. In the rebound material recovery step, drying of the recovered rebound material is suppressed by using the above-described rebound material recovery method.

  Further, in the rebound material recovery device 51, the air conveyance device 55 generates the suction force of the suction device 53 and the pressure for conveying the rebound material B in the conveyance hose 56. Since the rebound material B is transported to above the planned filling space R by such air transportation, it is not necessary to construct a complicated transporting means in the narrow planned filling space R.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the present embodiment, the same or equivalent components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 7, in this embodiment, the hopper 17 d of the material supply machine 17 c functions as a receiving unit that receives the rebound material discharged from the dust collector 57. That is, the material supply unit 17 c is arranged so that the hopper 17 d is positioned below the discharge port 63 of the dust collector 57.

  Also in the rebound material recovery method and the rebound material reuse method using the rebound material recovery device 51 ′, the above-described spraying process, rebound material recovery process, rebound material transport process, and material transfer process are performed in parallel. . However, as a difference from the first embodiment, in the rebound material transport process by the rebound material recovery device 51 ′, the rebound material B from the dust collector 57 is automatically supplied to the material supply machine 17c and further blown through the material supply machine 17c. It is automatically sent to the attaching machine 17a. In addition, new bentonite is also supplied to the material supply machine 17c by another route, and the new bentonite and the rebound material B are mixed and supplied to the spraying machine 17a. With such a configuration, the rebound material can be directly reused for spraying, and the continuity of reuse is improved.

  The same effects as those of the first embodiment can also be obtained by the rebound material recovery device 51 ′, the rebound material recovery method, and the rebound material reuse method of the second embodiment described above. That is, due to the presence of the turbo fan 69 provided in the dust collector 57, the wind hitting the rebound material B in the hopper 17d from the dust collector 57 is suppressed to a small extent, and drying of the rebound material B can be suppressed. And the water content ratio of the rebound material B can be ensured to an extent suitable for reuse as a spray material.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to the said embodiment, You may change in the range which does not change the summary described in each claim.

  DESCRIPTION OF SYMBOLS 1 ... Spraying apparatus, 17a ... Spraying machine, 17c ... Material supply machine (receiving means), 31 ... Spraying nozzle, 51, 51 '... Rebound material collection | recovery apparatus, 53 ... Aspirator, 55 ... Air conveyance machine, 57 ... dust collector, 59 ... flexible container (receiving means, storage part), 59c ... pressure gauge (pressure monitoring means), 63 ... discharge port, 69 ... turbofan (exhaust means), 73 ... casters, 101 ... marginal depth disposal facility, B ... rebound material, D ... introduction space.

Claims (8)

A rebound material recovery device for recovering rebound material generated at the time of spraying in the method of spraying bentonite material used for construction of a radioactive waste margin disposal facility,
An aspirator for sucking the rebound material from a point of fall of the rebound material;
An air transporter for transporting the rebound material sucked by the suction device with air;
A dust collector having an introduction space in which the rebound material conveyed by the air conveyance device is introduced together with air, and separating the rebound material in the introduction space from the air and discharging it from a discharge port by gravity;
Receiving means for receiving the rebound material discharged from the dust collector,
The dust collector is
Forcibly closed exhaust means for discharging air to the outside from the introduction space,
The rebound material recovery apparatus , wherein the exhaust means has an exhaust capacity equal to or greater than a transport capacity of the air transport machine . The receiving means is
It has a storage part that is detachable from the discharge port of the dust collector and stores the rebound material from the discharge port,
The dust collector is
The rebound material recovery apparatus according to claim 1, further comprising a caster positioned below the attached storage unit. The receiving means is
The rebound material recovery apparatus according to claim 1, wherein the rebound material recovery device is a material supply device that supplies the rebound material to a sprayer that sprays the bentonite-based material. A rebound material recovery method for recovering rebound material generated during spraying in a bentonite-based material spraying method used for construction of a marginal disposal facility for radioactive waste,
An aspirator for sucking the rebound material from a point of fall of the rebound material;
An air transporter for transporting the rebound material sucked by the suction device with air;
A dust collector having an introduction space in which the rebound material conveyed by the air conveyance device is introduced together with air, and separating the rebound material in the introduction space from the air and discharging it from a discharge port by gravity;
Receiving means for receiving the rebound material discharged from the dust collector,
Using the rebound material recovery device that the dust collector has exhaust means for forcibly exhausting air from the introduction space to the outside, the exhaust capacity of the exhaust means is adjusted to be larger than the transport capacity of the air transport machine And the said rebound material is collect | recovered by the said receiving means, The rebound material collection method characterized by the above-mentioned. A rebound material recovery method for recovering rebound material generated during spraying in a bentonite-based material spraying method used for construction of a marginal disposal facility for radioactive waste,
An aspirator for sucking the rebound material from a point of fall of the rebound material;
An air transporter for transporting the rebound material sucked by the suction device with air;
A dust collector having an introduction space in which the rebound material conveyed by the air conveyance device is introduced together with air, and separating the rebound material in the introduction space from the air and discharging it from a discharge port by gravity;
Receiving means for receiving the rebound material discharged from the dust collector,
The dust collector has exhaust means for forcibly exhausting air from the introduction space to the outside,
Rebound that is detachably attached to the discharge port of the dust collector and that stores the rebound material in the storage unit using a rebound material recovery device in the receiving means that stores the rebound material from the discharge port. A material storage process;
A balance adjustment step of adjusting the balance between the transfer capability of the air transfer device and the exhaust capability of the exhaust means so that the pressure in the storage portion is substantially equal to the atmospheric pressure in the rebound material storage step. Rebound material collection method characterized by this. The rebound material recovery device includes pressure monitoring means for monitoring the pressure in the reservoir,
In the balance adjustment step,
The rebound material recovery method according to claim 5, wherein the balance is adjusted based on a monitoring result obtained by the pressure monitoring unit. The said dust collector has a caster located under the said storage part to which it was attached, The rebound material collection | recovery method of Claim 5 or 6 characterized by the above-mentioned. A rebound material reuse method for reusing the rebound material generated at the time of spraying in the method of spraying bentonite materials used for construction of a marginal disposal facility for radioactive waste,
A spraying step of spraying the bentonite-based material from a spray nozzle of a sprayer;
A rebound material recovery step of recovering substantially the entire amount of the rebound material generated in the spraying step by the rebound material recovery method according to any one of claims 4 to 7 ,
A rebound material conveying step for supplying the rebound material recovered in the rebound material recovery step to a material supply device for supplying the rebound material to the sprayer;
In the spraying machine, a material transfer step of transporting the bentonite-based material including the rebound material supplied from the material supply machine to the spraying nozzle, and
The rebound material recycling method, wherein the spraying step, the rebound material recovery step, the rebound material transport step, and the material transfer step are performed in parallel.

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