JP2007069111A - Cylindrical water barrier layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical water barrier layer, wherein a plurality of divided blocks consisting of a clay-based water barrier material can be fixed closely to one another, and the waste can be conveyed to the accurate position. <P>SOLUTION: A guide rail 4 extending to the axial direction of a tunnel is arranged on the inner peripheral surface of a lining 10 of the tunnel 1 and water barrier material blocks consisting of the clay-based water barrier material 2 are supported by the guide rail 4, so that the clay-based water barrier material 2 can be kept in a cylindrical state and the water barrier material blocks can be arranged accurately in predetermined positions of the tunnel 1. Particularly, the guide rail 4 supports the outer peripheral surface of a housing part 21, which is composed of housing part blocks 211 being the water barrier material blocks having the shapes formed by dividing the housing part 21 in the peripheral direction and in which the housing part blocks are combined cylindrically with one another, and keeps the housing part blocks in cylindrical states. As a result, the housing part 21 can be kept in a cylindrical state without misalignment between the adjacent housing part blocks 211. When a waste conveying apparatus is guided movably to the axial direction of the tunnel by the guide rail 4 supporting the water barrier material blocks, the waste 3 can quickly be arranged accurately in a predetermined position of an internal space of the housing part 21. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cylindrical water shielding layer used when embedding industrial waste or radioactive waste.

  In the case where industrial waste or radioactive waste is buried in the ground, a water shielding layer that does not allow toxic substances to leak into groundwater is constructed, and the waste is stored in the water shielding layer. On the outer wall of the water-impervious layer, bentonite or a high-density clay-based water-impervious material in which bentonite and aggregate are kneaded is used.

  Conventionally, a method has been proposed in which a clay-based water shielding material molded to a high density in advance is formed into a block shape and stacked at a fixed position to construct a water shielding layer. In this example, the clay-based soil material is pressed to form a high-density molded body, or it is pre-molded into divided sized blocks, so that it can be installed around cylindrical waste. Have been reported (for example, see Non-Patent Document 1).

  In addition, a method has been proposed in which a high-density clay-based water shielding material previously molded into a block shape is installed in combination around a cylindrical waste. Specifically, when constructing a cylindrical impermeable layer on the inner side of a support that constitutes a circular tunnel, a clay-type shielding that is further divided into a plurality of circumferentially divided cylindrical types in the axial direction of the tunnel. A block made of water is used. Then, a block is installed in the lower half of the support construction to construct the lower half of the cylindrical impermeable layer, and then the hollow inner part is placed on the inner half of the lower half of the constructed cylindrical impermeable layer. Place the empty support cylinder, and then install the upper half block of the support work on the outside support cylinder (outside) to construct the upper half of the cylindrical impermeable layer (for example, patent Reference 1).

Nuclear Fuel Cycle Development Organization, “Technical Reliability Overview Report on High-Level Radioactive Waste Geological Disposal in Japan,” issued on November 26, 1999, p. IV-52 JP 2005-144278 A

  When using a block made of a clay-based water shielding material obtained by further dividing a cylindrical shape divided in the axial direction of the tunnel into a plurality of portions in the circumferential direction as in the invention of Patent Document 1, in order to arrange the divided blocks in a cylindrical shape Therefore, it is necessary to configure so that the outer diameter of the cylindrical shape matches the inner diameter of the support. However, in practice, in order to transport the block into the support and place it at a fixed position, the inner diameter of the support is made larger than the outer diameter of the cylindrical water shielding layer and the inner wall of the support and the cylindrical It is necessary to provide a gap between the outer wall surface of the water layer. That is, the curvature of the outer peripheral surface having a cylindrical block is smaller than the curvature of the inner peripheral surface of the support work. For this reason, the divided blocks cannot be combined in a cylindrical shape, and a gap is generated between the blocks.

  Moreover, the waste accommodated in the cylindrical water-impervious layer forms a cylindrical waste in the form of being loaded in a cylindrical container having a shielding function. This cylindrical waste generally has a weight of several tens of tons. However, in a circular tunnel, high-precision and heavy-weight rigidity is required to insert such heavy cylindrical waste into the hollow part of a cylindrical water-impervious layer made of a clay-based water-impervious material that is easily damaged. Therefore, the conveying device becomes a large heavy object. Moreover, although waste is a toxic substance and it is necessary to remotely operate the transport device, it requires high transport accuracy as described above, so that it is difficult to work in a short time. Thus, it is difficult to transport waste to an accurate position.

  In view of the above circumstances, the present invention provides a cylindrical water shielding layer that can place a block made of a plurality of clay-based water shielding materials without gaps and can transport waste to an accurate position. The purpose is to do.

  In order to achieve the above object, a cylindrical water-impervious layer according to claim 1 of the present invention includes a clay-based water-impervious material disposed in a cylindrical shape inside a tunnel having a substantially circular cross section, and the clay-based water-impervious material. In a cylindrical water-impervious layer containing waste in a cylinder made of the above, a water-impervious layer formed by dividing an annular shape obtained by dividing the cylindrical shape of the clay-based water-impervious material in the axial direction of the tunnel into a plurality of portions in the circumferential direction. And a guide rail that extends in the axial direction of the tunnel in a manner that maintains the cylindrical shape by supporting an outer peripheral surface in which the water shielding material blocks are combined in a cylindrical shape. And

  The cylindrical water-impervious layer according to claim 2 of the present invention has a clay-type water-impervious material disposed in a cylindrical shape inside a tunnel having a substantially circular cross section, and contains waste in a cylinder made of the clay-based water-impervious material. A cylindrical water-impervious layer that extends in the axial direction of the tunnel so as to support a cylindrical outer peripheral surface of the clay-based water-impervious material, and the cylinder of the clay-based water impermeable material A guide rail that guides a waste transporting device that transports waste in the extending direction is provided.

  The cylindrical water-impervious layer according to the present invention includes a guide rail that extends in the axial direction of the tunnel in a manner that supports the outer peripheral surface in which the water-blocking material blocks are combined in a cylindrical shape and maintains the cylindrical shape. Prepared. For this reason, while maintaining the cylindrical shape of the clay-based water shielding material, the clay-based water shielding material can be accurately arranged at a predetermined position inside the tunnel. In particular, the guide rail supports the outer peripheral surface of a cylindrical combination of water-blocking material blocks formed by dividing a circular shape of a clay-based water-proofing material in the axial direction of the tunnel into multiple parts in the circumferential direction. Then, the cylindrical shape is maintained. For this reason, a cylindrical shape can be maintained without generating a gap between the respective water shielding material blocks. As a result, it is possible to construct a water-impervious layer that appropriately forms a space for accommodating waste and does not leak toxic substances of waste into groundwater.

  In addition, since the water-blocking material block is supported on the guide rail, the water-blocking material block transported by a forklift can be placed directly on the guide rail. It can be pushed and conveyed in the extending direction (tunnel axis direction). As a result, it is possible to easily position the clay-based water shielding material that is easily damaged and has a low strength at a predetermined position. Further, since the water shielding material block can be pushed and conveyed in the tunnel axial direction X, a space larger than the height of the guide rail is not required in the tunnel.

  In addition, since waste is stored in a space with a high radiation dose, it is not easy to place it at an accurate position. However, it is easy to accurately install guide rails on the inner peripheral surface of the tunnel lining when constructing a cylindrical impermeable layer before the radiation dose becomes a high-dose environment. Placement accuracy in housing can be ensured.

  The cylindrical water-impervious layer according to the present invention is disposed so as to extend in the axial direction of the tunnel so as to support the cylindrical outer peripheral surface of the clay-based water-impervious material, and A guide rail is provided that guides a waste transporting device that transports waste into a cylinder so as to be movable in the extending direction. For this reason, the waste transport device can be moved and stopped, and the transport of the waste can be performed accurately, and the waste can be quickly and accurately placed at a predetermined position in the cylindrical internal space of the clay-based water shielding material. Can do. Further, since the waste transport device is supported by the guide rail, the constituent members of the waste transport device can be made light, and the waste transport device can be reduced in weight. In particular, a forklift type transport device requires a large amount of counterweight, but if a guide rail is provided with a tip-over prevention mechanism, it is not necessary to provide a heavy load such as a counterweight, thereby reducing the weight of the waste transport device. be able to.

  Exemplary embodiments of a cylindrical water shielding layer according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a front sectional view showing an embodiment of a cylindrical water shielding layer according to the present invention, and FIG. 2 is a side sectional view of the cylindrical water shielding layer shown in FIG.

  As shown in FIGS. 1 and 2, the cylindrical water-impervious layer in the present embodiment has a clay-based water-impervious material 2 arranged in a cylindrical shape inside a tunnel 1 having a substantially circular cross section, and the clay-based impermeable material 2 The cylindrical waste 3 is accommodated in a cylinder made of Examples of the waste 3 include radioactive waste.

  The clay-based water-impervious material 2 is formed by kneading bentonite or bentonite and aggregate, and pressing and compacting them at high density. The clay-based water shielding material 2 includes an annular storage portion 21 and a disk-shaped wall portion 22 as a water shielding material block obtained by dividing a cylindrical shape in the tunnel axis direction X. The accommodating part 21 accommodates the waste 3 in an internal space formed by arranging a plurality (three in the present embodiment) in the tunnel axis direction X. The wall portion 22 closes the internal space of the housing portion 21 by being arranged at both ends of the housing portion 21 in the tunnel axis direction X. Further, the clay-based water shielding material 2 includes a housing block 211 obtained by further dividing the annular housing portion 21 as a water shielding material block into a plurality of pieces (six divisions in the present embodiment) in the circumferential direction. In addition, although not shown in the drawing, the clay-based water shielding material 2 may include a wall block obtained by further dividing the disk-shaped wall portion 22 into a plurality of portions in the circumferential direction as a water shielding material block.

  As described above, the clay-based water shielding material 2 includes the annular housing portion 21 and the disk-shaped wall portion 22 as a water shielding material block obtained by dividing the cylindrical shape in the tunnel axis direction X. The housing section 21 is further divided into a plurality of housing sections 21 in the circumferential direction. For this reason, it is possible to easily carry the clay-based water shielding material 2 inside the tunnel 1.

  Moreover, the inner peripheral diameter of the lining 10 in the tunnel 1 is formed so as to be larger than the outer peripheral diameter of the clay-based water shielding material 2 (the accommodating portion 21 and the wall portion 22). For this reason, it is possible to easily assemble the housing block 211 inside the tunnel 1.

  However, when the inner peripheral diameter of the lining 10 in the tunnel 1 is larger than the outer peripheral diameter of the clay-based water shielding material 2, when the storage block 211 is assembled as it is, each storage is performed as shown in FIG. 3. Deviation occurs between the partial blocks 211 and the annular shape cannot be maintained, and a gap is formed between the respective accommodating unit blocks 211, or the internal space of the accommodating unit 21 is deformed, making it difficult to accommodate the waste 3. In this case, there is a risk that the toxic substances of the waste 3 may leak into the groundwater.

  Therefore, as shown in FIGS. 1 and 2, in the present embodiment, the cylindrical shape is supported by supporting the outer peripheral surface in which the water shielding material blocks (the accommodating portion 21 and the wall portion 22) are combined in a cylindrical shape. The guide rail 4 is arranged on the inner peripheral surface of the lining 10 of the tunnel 1 so as to extend in the tunnel axial direction X.

  As shown in FIG. 1, the guide rail 4 is provided in four places in the aspect contact | abutted on the outer periphery (circumferential curved surface) of the clay-type water shielding material 2 in this Embodiment. Further, as shown in FIG. 1, the guide rail 4 in the present embodiment is made of a steel material having a substantially U-shaped cross-sectional shape, and is flat by arranging its opening toward the inner peripheral surface of the lining 10. The part is in contact with the circumferential curved surface of the clay-based water shielding material 2.

  In more detail, the guide rail 4 includes a lowermost central storage block 211 and the storage block 211 on both sides thereof so as to support the lower half of the annular half of the storage block 211 divided into six. A total of four guide rails 4 are provided, two guide rails 4 that come into contact with the two housing block 211 at the two boundary portions, and two guide rails 4 that come into contact with the upper side of the housing block 211 on both sides. That is, the guide rail 4 supports the lower half half of the annular portion of the accommodation block 211 divided into six parts, thereby supporting the upper half accommodation block 211 of the remaining annular shape by the lower half, While maintaining the cylindrical shape which combined the water shielding material block (the accommodating part 21 and the wall part 22), the said cylindrical shape is arrange | positioned in the inner center of the tunnel 1 of a substantially circular cross section.

  In other words, when the housing block 211 is arranged inside the tunnel 1, the three housing blocks 211 in the lower half of the annular shape are placed so as to be supported by the guide rail 4, and then the upper half of the lower half is placed. The housing portion block 211 of the upper half of the annular shape is placed on the housing portion 21, and the housing portion 21 is disposed in an annular shape. Similarly, by placing the wall portion 22 so as to be supported by the guide rail 4, the clay-based water shielding material 2 together with the accommodating portion 21 is accurately placed at a predetermined position inside the tunnel 1.

  As described above, the cylindrical impermeable layer described above is provided with the guide rail 4 extending in the tunnel axial direction X on the inner peripheral surface of the lining 10 of the tunnel 1, and the guide rail 4 allows the An annular housing portion 21 as a water shielding material block and a disk-shaped wall portion 22 are supported. For this reason, while maintaining the cylindrical shape of the clay-based water shielding material 2, it is possible to accurately arrange the clay-based water shielding material 2 at a predetermined position inside the tunnel 1. In particular, the guide rail 4 supports the outer peripheral surface which combined the accommodating part block 211 which divided | segmented the accommodating part 21 into the circumferential direction as a water shielding material block, and maintains the said cylindrical shape. For this reason, it becomes possible to maintain the cylindrical shape of the accommodating part 21 without producing a gap between the accommodating part blocks 211. As a result, it is possible to appropriately form an internal space of the accommodating portion 21 that accommodates the waste 3 and to construct a water shielding layer that does not allow the toxic substances of the waste 3 to leak into the groundwater.

  Further, as shown in FIG. 1, the guide rail 4 is made of a steel material having a substantially U-shaped cross-section, and the flat portion is arranged with the clay-based shielding by arranging its opening toward the inner peripheral surface of the lining 10. It contacts the circumferential curved surface of the water material 2. That is, since the accommodating part 21 and the wall part 22 are supported on the flat part of the guide rail 4, the accommodating part 21 and the wall part 22 conveyed by the forklift etc. can be directly set | placed on the guide rail 4, and also a guide rail Since the accommodating portion 21 and the wall portion 22 are supported on the four flat portions, the accommodating portion 21 and the wall portion 22 can be pushed and conveyed in the tunnel axial direction X. As a result, the clay-based water-insulating material 2 is formed by kneading bentonite or bentonite and aggregate and compacting them with high density. It is possible to easily perform positioning for disposing at a predetermined position. Moreover, since the accommodating part 21 and the wall part 22 can be pushed and conveyed in the tunnel axial direction X, a space larger than the height of the guide rail 4 is not required.

  In addition, since the waste 3 is stored in a space with a high radiation dose, it is not easy to place the waste 3 at an accurate position. However, since it is easy to accurately install the guide rail 4 in advance on the inner peripheral surface of the lining 10 of the tunnel 1 at the time of construction of the cylindrical water shielding layer before the radiation dose becomes a high dose environment, It is possible to ensure the placement accuracy in the storage of the waste 3.

  In addition, the accommodation part block which divided | segmented 6 only by the two guide rails 4 contact | abutted together to the two accommodation part blocks 211 in two places of the boundary part of the accommodation part block 211 of the lowest center and the accommodation part block 211 of the both sides. Since it is possible to support the lower half of 211, at least two guide rails 4 in the present embodiment are sufficient. Further, the guide rail 4 is not limited to a substantially U-shaped cross section, and may be, for example, a substantially L-shaped cross section or a substantially H-shaped cross section, and is not necessarily limited to the cross-sectional shape. Moreover, the accommodating part block 211 may be not only six divisions but multiple division | segmentation, and the aspect which maintains the cylindrical shape which combined the water-blocking material block (accommodating part 21 and wall part 22) corresponding to this division | segmentation. A guide rail 4 may be provided.

  4 is a front sectional view showing another embodiment of the cylindrical water shielding layer according to the present invention, and FIG. 5 is a side sectional view of the cylindrical water shielding layer shown in FIG.

  As shown in FIGS. 4 and 5, in other embodiments, the accommodating portion 21 is not divided in the circumferential direction. A reinforcing member 23 made of steel is provided on the outer peripheral edge and the inner peripheral edge, which are the peripheral curved surfaces of the housing portion 21. A reinforcing member 23 is also provided on the outer peripheral edge that is the peripheral curved surface of the wall portion 22.

  Thus, the strength of the accommodating portion 21 and the wall portion 22 is increased by providing the reinforcing member 23. For this reason, as shown in FIGS. 4 and 5, the accommodating portion 21 and the wall portion 22 can be transported by the carriage 5.

  In addition, although the cart 5 is shown as a structure which carries the accommodating part 21 on a pair in FIG. 4, it is good also as a form which conveys the accommodating part 21 and the wall part 22 by the multiple or single cart 5. FIG. Further, in FIG. 5, the carriage 5 is shown as a configuration that conveys one accommodating portion 21, but is formed in a longitudinal shape in the tunnel axis direction X in a form that conveys a plurality of accommodating portions 21 and wall portions 22. May be.

  Hereinafter, the accommodation of the waste 3 in the above-described cylindrical impermeable layer will be described. FIG. 6 is a front view showing the waste conveyance device, and FIG. 7 is a side view showing the waste conveyance device shown in FIG.

  As shown in FIGS. 6 and 7, the waste transport apparatus 6 inserts the retained waste 3 into the interior space of the storage unit 21 and places it. The waste transport device 6 includes a frame 61 made of a steel material and includes a wheel 62, a shielding container 63, a lid opening / closing mechanism 64, a waste guide mechanism 65, and a waste push-out mechanism 66.

  The wheel 62 is disposed so as to be placed on the guide rail 4 described above. The wheel 62 rotates on the guide rail 4. That is, the frame body 61 (waste transport apparatus 6) is configured to be movable in the tunnel axis direction X that is the extending direction of the guide rail 4 by the wheel 62 and the guide rail 4.

  The shielding container 63 is for containing the waste 3 and is made of a material that blocks the radiation of the waste 3. The shielding container 63 is formed in a cylindrical shape in such a manner that the columnar waste 3 is accommodated sideways. One end of the cylindrical shape is closed and formed, and a lid 631 is provided at the other end toward the internal space of the accommodating portion 21.

  The lid opening / closing mechanism 64 is for opening and closing the lid 631 of the shielding container 63. The lid opening / closing mechanism 64 is configured to move the lid 631 up and down in the present embodiment, and opens the other end of the shielding container 63 by moving the lid 631 upward (open position). On the other hand, the other end of the shielding container 63 is closed by closing the lid 631 (closed position). In addition, the moving direction in opening and closing of the cover part 631 is not limited up and down.

  The waste guide mechanism 65 has, for example, a roller conveyor 651 and supports the waste 3 accommodated in the shielding container 63 while guiding the movement in the columnar extending direction (tunnel axial direction X). It is. The waste guide mechanism 65 is supported by finely adjusting the waste 3 to a desired position in millimeters by moving the position of the roller conveyor 651 in a direction orthogonal to the tunnel axis direction X by a hydraulic piston 652 or the like. However, the movement is smoothly guided.

  The waste push-out mechanism 66 is disposed on one end side of the shielding container 63, and pushes out the waste 3 stored in the shielding container 63 toward the other end side (tunnel axial direction X) of the shielding container 63. It is. The waste pushing mechanism 66 is composed of, for example, a hydraulic piston.

  The waste transport device 6 is operated by remote control. The waste transport device 6 moves in the tunnel axial direction X while being guided by the wheel 62 and the guide rail 4 while the waste 3 is accommodated in the shielding container 63 and the lid 631 is moved to the closed position. Next, when the waste transporting device 6 moves to the transporting position of the waste 3 in front of the internal space of the storage unit 21, the lid opening / closing mechanism 64 moves the lid 631 to the open position so that the shielding container 63 Open the other end. Next, the waste transport device 6 pushes the waste 3 out of the shielding container 63 by the waste push-out mechanism 66 and transports the waste 3 to the internal space of the storage unit 21. At this time, the waste 3 is guided to move by the waste guide mechanism 65.

  As described above, in the above-described cylindrical water shielding layer, the waste transport device 6 is guided to be movable in the tunnel axial direction X by the guide rail 4 that supports the water shielding material block. For this reason, the movement and stop of the waste transport device 6 and the transport of the waste 3 can be accurately performed, and the waste 3 can be quickly and accurately arranged at a predetermined position in the internal space of the storage unit 21. become. Further, since the waste transport device 6 is supported on the guide rail 4 by the plurality of wheels 62, the constituent members of the waste transport device 6 can be made light, and the waste transport device 6 can be reduced in weight. It becomes possible. In particular, in a forklift type transport device, a large amount of counterweight is required. However, if a fall prevention mechanism for holding the wheel 62 is provided on the guide rail 4, it is not necessary to provide a heavy load such as a counterweight. It is possible to reduce the weight of the device 6.

It is a front view sectional view showing an embodiment of a cylindrical impermeable layer concerning the present invention. FIG. 2 is a side sectional view of the cylindrical water shielding layer shown in FIG. 1. It is front view sectional drawing which shows the case where a guide rail is not provided in the cylindrical water shielding layer shown in FIG. It is a front view sectional view showing other embodiments of the cylindrical type impermeable layer concerning the present invention. FIG. 5 is a side sectional view of the cylindrical water shielding layer shown in FIG. 4. It is a front view which shows a waste conveyance apparatus. It is a side view which shows the waste conveyance apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel 10 Covering 2 Clay-type water shielding material 21 Storage part 211 Storage part block 22 Wall part 23 Reinforcement material 3 Waste 4 Guide rail 5 Carriage 6 Waste conveyance apparatus 61 Frame body 62 Wheel 63 Shielding container 631 Cover part 64 Cover Opening and Closing Mechanism 65 Waste Guide Mechanism 651 Roller Conveyor 652 Hydraulic Piston 66 Waste Extrusion Mechanism X Tunnel Axial Direction

Claims (2)

In the cylindrical water-impervious layer in which the clay-based water shielding material is arranged in a cylindrical shape inside the tunnel having a substantially circular cross section and the waste is stored in the cylinder made of the clay-based water shielding material,
A water shielding material block formed by dividing a cylindrical shape of the clay-based water shielding material in the axial direction of the tunnel into a plurality of parts in the circumferential direction;
A guide rail that extends in the axial direction of the tunnel in a manner that supports the outer peripheral surface of the water blocking material block combined in a cylindrical shape and maintains the cylindrical shape. Impermeable layer. In the cylindrical water-impervious layer in which the clay-based water shielding material is arranged in a cylindrical shape inside the tunnel having a substantially circular cross section and the waste is stored in the cylinder made of the clay-based water shielding material,
Disposal that extends in the axial direction of the tunnel in a manner to support the cylindrical outer peripheral surface of the clay-based water shielding material, and transports waste into the cylinder of the clay-based water shielding material A cylindrical water-impervious layer comprising a guide rail that guides the object transporting device so as to be movable in the extending direction.

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