JP4687971B2 - Impermeable layer for buried processing - Google Patents

Description

  The present invention relates to an impermeable layer for embedding treatment, and more particularly, to an impermeable layer for embedding treatment used for embedding waste such as industrial waste and radioactive waste.

  In general, when waste such as industrial waste or radioactive waste is buried in the ground, a buried impermeable layer is formed to prevent leakage of toxic substances in the groundwater. Waste is stored inside the bed. For the formation of such a water shielding layer, for example, bentonite or a high-density clay-based water shielding material in which bentonite and an aggregate are kneaded is used.

  Conventionally, a water impermeable layer for embedding treatment has been proposed in which a clay-type water impermeable material molded in advance at a high density is formed into a block shape and stacked in place. 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 cylindrical impermeable layer for embedding treatment has been proposed in which a high-density clay-based impermeable material previously molded in a block shape is installed around a cylindrical waste. Specifically, an annular block divided along the longitudinal direction (axial direction) of the tunnel when the impermeable layer for embedding treatment is formed inside the support that constitutes the tunnel having a substantially circular cross section. Further, a block made of a clay-based water shielding material, which is further divided into a plurality of parts in the circumferential direction, is used. Then, a block is installed in the lower half of the support work to form the lower half of the impermeable layer for burying treatment, and then hollow on the lower half (inside) of the formed impermeable layer for burying treatment. After installing the inner air support cylindrical body, the upper half block of the cylindrical embedding treatment is installed by placing the upper half block of the support work on the outer air support cylinder body (outside). It forms (for example, refer patent document 1).

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

  By the way, in recent years, a water shielding block having an annular shape (hereinafter also referred to as an annular water shielding block) and a water shielding property having a disk shape from various viewpoints such as cost reduction or improvement in placement properties. It has been proposed to use a block (hereinafter also referred to as a disk-shaped impermeable block). More specifically, a cylindrical storage unit is formed by forming an annular water-blocking block and a disk-shaped water-blocking block in advance in a factory, etc., and transporting and stacking a plurality of circular water-blocking blocks in an underground tunnel. Form. After waste is stored in the hollow portion of the cylindrical storage portion, a disk-shaped water-blocking block is stacked on the cylindrical storage portion so as to close the hollow portion to form a water-blocking layer for burying treatment. .

  However, in such a buried impermeable layer, the annular impermeable block and the disc-shaped impermeable block are damaged as a result of being in contact with the inner wall surface of the tunnel while being transported in the tunnel or being placed. As a result, there is a possibility that it cannot be used for waste burying processing.

  In view of the above circumstances, the present invention provides an impermeable layer for embedding treatment that can be effectively used for embedding waste without the risk of damaging the annular impermeable block and the disc-shaped impermeable block. The purpose is to provide.

In order to achieve the above object, a buried impermeable layer according to claim 1 of the present invention is provided with a plurality of annular impermeable blocks made of clay-based impermeable material inside a tunnel having a substantially circular cross section. The cylindrical storage unit is formed by laminating along the longitudinal direction of the cylinder, and includes a cylindrical storage unit in which waste is stored in the hollow part, and a clay-based water shielding material, and the cylindrical storage unit is configured to close the hollow part. In the impermeable layer for embedding treatment used for embedding the waste, the annular impermeable block and the disc-shaped impermeable block include: Ri formed a respective peripheral curved portion reinforcing frame body for reinforcing the longitudinal direction of the tunnel in a manner wherein the annular water barrier block and the disc-shaped water shield block is separated from the inner wall surface of the tunnel Allows displacement along A guide member that regulates a stacking position of the annular water-blocking block and the disc-shaped water-blocking block, and the guide member conveys the annular water-blocking block and the disk-shaped water-blocking block. the conveying device is characterized that you movably guided along the longitudinal direction of the tunnel.

  According to a second aspect of the present invention, there is provided the impermeable layer for embedding treatment according to the first aspect, further comprising engagement means for engaging the reinforcing frame bodies adjacent to each other.

  According to the impermeable layer for embedding treatment of the present invention, the reinforcing frame reinforces the respective circumferentially curved portions of the annular impermeable block and the disc-shaped impermeable block. The strength of each of the water-blocking blocks can be improved, and there is no possibility that the water-blocking blocks will be damaged during transportation or stationary work. Therefore, there is no possibility that the toxic substance of the waste is leaked into the ground water, and there is an effect that it can be effectively used for the waste burying process.

  Exemplary embodiments of a water impermeable layer for embedding treatment according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.

  1 and 2 schematically show the structure of the impermeable layer for embedding treatment in the embodiment of the present invention, respectively. FIG. 1 is a front sectional view and FIG. 2 is a side sectional view. It is. In these FIG. 1 and FIG. 2, the impermeable layer for burying treatment is formed inside the tunnel 1 having a substantially circular cross section, and includes a cylindrical storage portion 10, a columnar blocking portion 20, and a guide rail (guide member). 30.

  The cylindrical storage portion 10 has a cylindrical shape having an outer peripheral diameter smaller than the inner peripheral diameter of the lining 1a of the tunnel 1, and has a water shielding block (hereinafter referred to as an annular shape) as shown in FIG. It is configured by laminating a plurality of (annular water-impervious blocks) 11 along the axial direction (longitudinal direction) of the tunnel 1. In the example shown in the figure, three annular water-blocking blocks 11 are laminated in such a manner that they are arranged side by side along the axial direction of the tunnel 1 and have a hollow portion 12 serving as a storage space inside. Yes. The hollow portion 12 is for storing the waste 3 such as industrial waste and radioactive waste. In the present embodiment, the radioactive waste is described as an example of the waste 3, and the waste 3 is assumed to have a cylindrical shape.

  The annular water-blocking block 11 is formed using bentonite or a high-density clay-based water-blocking material in which bentonite and aggregate are kneaded. Each has an inner reinforcing frame 13 and an outer reinforcing frame 14 made of steel. The inner reinforcing frame 13 is for reinforcing an inner peripheral portion that becomes a peripheral curved portion of the annular water-blocking block 11, and more specifically, the portion is damaged by covering the inner peripheral surface 11a. This is to prevent this. The outer reinforcing frame 14 is used to reinforce the outer peripheral portion that becomes the circumferential curved portion of the annular water-blocking block 11, and more specifically, the outer peripheral surface 11b is covered so that the portion is damaged. It is for preventing. Details of the inner reinforcing frame 13 and the outer reinforcing frame 14 will be described later.

  The columnar closing portion 20 has an outer peripheral diameter equal to the outer peripheral diameter of the cylindrical storage portion 10, and closes the hollow portion 12 of the cylindrical storage portion 10, and the axial direction of the tunnel 1 of the cylindrical storage portion 10. Are juxtaposed at both ends. The columnar blocking portion 20 includes a plurality of water shielding blocks (hereinafter referred to as disk-shaped water shielding blocks) 21 having a disk shape as shown in FIG. 4 along the axial direction of the tunnel 1. It forms a columnar form constituted by laminating in a mode. In the illustrated example, three disk-shaped impermeable blocks 21 are configured to be stacked in such a manner that they are arranged side by side along the axial direction of the tunnel 1.

  The disc-shaped impermeable block 21 has the same outer diameter as the annular impermeable block 11 and, like the annular impermeable block 11, bentonite, or a high density in which bentonite and aggregate are kneaded. It was formed using a clay-based water shielding material. Moreover, the disk-shaped water-impervious block 21 has an outer reinforcement frame 22 made of a steel material at a circumferentially bent portion, that is, an outer peripheral portion. The outer reinforcing frame 22 is used to reinforce the outer peripheral portion that is the peripheral curved portion of the disk-shaped impermeable block 21, and more specifically, the outer peripheral surface 21b is covered to damage the portion. It is for preventing. Details of the outer reinforcing frame 22 will be described later.

  The inner reinforcement frame 13 has a smooth inner peripheral surface, and has an engagement protrusion 13a and an engagement recess 13b that constitute engagement means. The engagement protrusion 13a is formed in a form protruding on one surface (the right side surface in FIG. 2) of the inner reinforcing frame 13. The engaging recess 13b has a size that fits with the engaging protrusion 13a, and is formed on the other surface of the inner reinforcing frame 13 (the surface on the left side in FIG. 2). As a result, the inner reinforcement frames 13 adjacent to each other are firmly engaged as a result of the engagement protrusions 13a of one inner reinforcement frame 13 being engaged with the engagement recesses 13b of the other inner reinforcement frame 13.

  The outer reinforcing frames 14 and 22 have smooth outer peripheral surfaces, and have engaging protrusions 14a and 22a and engaging recesses 14b and 22b constituting engaging means. The engaging protrusions 14a and 22a are formed so as to protrude from one surface (the surface on the right side in FIG. 2) of the outer reinforcing frames 14 and 22. The engaging recesses 14b and 22b have a size that fits with the engaging protrusions 14a and 22a, and are formed on the other surface of the outer reinforcing frames 14 and 22 (the left side surface in FIG. 2). is there. As a result, the outer reinforcing frames 14 and 22 adjacent to each other are engaged with the engaging protrusions 14a and 22a of one outer reinforcing frame 14 and 22 and the engaging recesses 14b and 22b of the other outer reinforcing frame 14 and 22, respectively. It will be firmly engaged.

  The guide rail 30 is disposed on the inner wall surface of the lining 1 a of the tunnel 1 in a manner extending in the axial direction of the tunnel 1. Specifically, there are two guide rails 30, each of which is arranged in a mode in which it is symmetrical with respect to the median plane of the tunnel 1 in the lower region of the tunnel 1. The guide rail 30 is made of a steel material having a substantially U-shaped cross-section, and the opening 31 is disposed toward the inner wall surface of the lining 1a. The flat part 32 of the guide rail 30 is a part in contact with the cylindrical storage part 10 and the columnar closed part 20, and the surface thereof is smooth.

  As shown in FIGS. 1 and 2, such a guide rail 30 is formed in such a manner that the axial centers of the cylindrical storage portion 10 and the columnar closing portion 20 coincide with the axial center of the tunnel 1. And the cylindrical block 20 is supported. Further, the guide rail 30 will be described in detail later, but before the cylindrical storage portion 10 and the columnar closed portion 20 are formed, the annular water-blocking block 11 and the disk-shaped water-blocking block which are constituent members thereof. 21 is allowed to be displaced in the axial direction of the tunnel 1 in a manner separated from the inner wall surface of the tunnel 1, and the stacking position of the annular water shielding block 11 and the disc-shaped water shielding block 21 is restricted. It is.

  5 to 12 schematically show a construction method of the impermeable layer for embedding treatment in the embodiment of the present invention, that is, a placement method of each impermeable block, and use these drawings as appropriate. The construction method of the impermeable layer for burying treatment will be described. In each figure, the cylindrical storage portion 10 and the columnar closing portion 20 are already shown, but these are also formed by the method described later.

  First, formation of the cylindrical storage unit 10 will be described. As shown in FIGS. 5A and 5B, the annular water blocking block 11 is placed on a carriage (conveying device) 40 and is slidably contacted with the flat portion 32 of the guide rail 30 in the axial direction of the tunnel 1. Convey along. That is, the carriage 40 is provided with a wheel (not shown) at the lower part, and the wheel rolls on the inner wall surface of the lining 1a between the two guide rails 30 to move forward and move to an annular shape. The impermeable block 11 is transported. As shown in FIGS. 6A and 6B, when the transported annular water-blocking block 11 reaches a position where it comes into contact with the already-positioned annular water-blocking block 11, Stops conveyance along the axial direction. Then, as shown to FIGS. 7-1 and 7-2, the conveyed annular | circular shaped water shielding block 11 is connected with the annular | circular shaped water shielding block 11 already fixed. That is, the engaging protrusion 13a of the inner reinforcing frame 13 and the engaging protrusion 14a of the outer reinforcing frame 14 of the transported annular block are made to engage with the engaging recess 13b of the inner reinforcing frame 13 of the annular annular shielding block 11 and The outer reinforcing frame 14 is connected by being engaged with and engaged with each of the engaging recesses 14b. Then, as shown in FIGS. 8A and 8B, only the carriage 40 is retreated. As a result, the cylindrical watertight block 11 is placed at a predetermined location to form the cylindrical storage portion 10.

  Next, formation of the columnar blocking portion 20 will be described. As shown in FIGS. 9-1 and 9-2, a plurality of (three in the illustrated example) disk-shaped water-impervious blocks 21 are stacked and placed on a carriage (conveyance device) 50 to guide rail 30. It is conveyed along the axial direction of the tunnel 1 while being in sliding contact with the flat portion 32 of the tunnel 1. In other words, the carriage 50 is provided with a wheel (not shown) in the lower part, and the wheel rolls on the inner wall surface of the lining 1a between the two guide rails 30 so as to advance and move, thereby being stacked. The disc-shaped impermeable block 21 is conveyed. Here, the plurality of disc-shaped water-impervious blocks 21 to be conveyed engage with each other by engaging the engaging protrusions 22a of the outer reinforcing frame 22 with the engaging recesses 22b in advance between the adjacent disc-shaped blocks. In a laminated state. As shown in FIGS. 10-1 and 10-2, the transported disc-shaped water-impervious block 21 is in a position where it comes into contact with the annular water-impervious block 11 constituting the cylindrical storage portion 10 that has already been placed. When reaching, the conveyance along the axial direction of the tunnel 1 by the carriage 50 is stopped. Thereafter, as shown in FIGS. 11A and 11B, the disc-shaped water-impervious block 21 in the transported stacked state has already been placed, and the columnar blocking portion 20 for storing the waste 3 is configured. It connects with the annular | circular shaped water shielding block 11 to do. That is, the engagement protrusions 22a of the outer reinforcing frame 22 of the transported laminated disk-shaped impermeable block 21 are engaged with the engaging recesses 14b of the outer reinforcing frame 14 of the annular impermeable block 11. Connect by joining. Then, as shown in FIGS. 12A and 12B, only the carriage 50 is retreated. As a result, the cylindrical occlusion portion 20 is placed in a state where the disk-shaped water-impervious blocks 21 in a laminated state are placed at predetermined positions and are arranged side by side at both ends in the axial direction of the tunnel 1 of the cylindrical storage portion 10. Will be formed.

  By the above-described method, the cylindrical storage portion 10 and the columnar blocking portion 20 are alternately arranged in the tunnel 1 along the axial direction of the tunnel 1, thereby forming the impermeable layer for burying treatment. The As described above, the guide rail 30 is configured such that when the cylindrical storage unit 10 and the columnar blocking unit 20 are formed, each of the annular water blocking block 11 and the disk-shaped water blocking block 21 is the lining 1a of the tunnel 1. Displacement in the axial direction of the tunnel 1 is allowed in a manner separated from the inner wall surface, and the stacking position of the annular water-blocking block 11 and the disc-shaped water-blocking block 21 is restricted.

  Thereafter, as shown in FIG. 13, for example, using a filler made of cement-based material or clay-based material, a gap between the inner wall surface of the tunnel 1 lining 1 a and the outer peripheral edge of the impermeable layer for burying treatment is formed. Fill. Here, various methods can be used as the filling method of the filler. In the illustrated example, reference numeral 61 indicates filling when the filler is sprayed, and reference numeral 62 indicates that the filler is made into a block shape. Shows the filling when inserted. By filling the filler in this way, the shape of the impermeable layer for burying treatment can be maintained over a long period of time, and the annular impermeable block 11 and the circle constituting the impermeable layer for burying treatment It can suppress effectively that the density of the clay of the plate-shaped impermeable block 21 falls.

  As described above, according to the impermeable layer for embedding treatment in the embodiment of the present invention, the inner reinforcing frame 13 reinforces the inner peripheral portion of the annular impermeable block 11, and the outer reinforcing frames 14, 22 Further, since the outer peripheries of the annular water shielding block 11 and the disk-shaped water shielding block 21 are reinforced, the strength of each of the annular water shielding block 11 and the disk-shaped water shielding block 21 can be improved. At the same time, there is no possibility of damaging these water-impervious blocks 11 and 21 during transportation or stationary work. Therefore, there is no possibility of toxic substances in the waste 3 leaking out into the ground water, and the waste 3 can be effectively used for burying the waste 3.

  Further, according to the impermeable layer for burying treatment, the guide rail 30 is formed in such a manner that each of the annular impermeable block 11 and the disc-shaped impermeable block 21 is separated from the inner wall surface of the lining 1a of the tunnel 1. 1 is allowed to be displaced in the axial direction, and the stacking position of the annular water shielding block 11 and the disc-shaped water shielding block 21 is regulated, so that the shape of the inner wall surface of the lining 1a of the tunnel 1 (for example, It is possible to transport the annular water-impervious block 11 and the disc-shaped impermeable block 21 without being affected by the uneven shape). It can be easily placed at a predetermined location.

  Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. Below, the modification of this invention is demonstrated, referring FIGS. In addition, in each figure, the same code | symbol is attached | subjected to what has the same structure as the embodiment of the said invention, and the description is abbreviate | omitted.

  In the present invention, as shown in FIGS. 14 and 15, the guide rail 30 ′ is arranged such that the flat portion 32 ′ is in contact with the inner wall surface of the covering 1 a, and the bottom of the opening 31 ′ is guided by the carriage 40. It is good as a road. More specifically, the guide rail 30 ′ guides the carriage 40 for transporting the annular water shielding block 11 and the disk-shaped water shielding block 21 so as to be movable along the axial direction of the tunnel 1. May be. Here, the guide rail 30 ′ is laid on the inner wall surface of the lining 1 a of the tunnel 1 in a manner extending along the axial direction of the tunnel 1 based on accurate surveying. According to such a configuration, as shown in the figure, even when the inner wall surface of the lining 1a of the tunnel 1 is uneven, the carriage 40 moves forward and retracts without being affected by the inner wall surface of the lining 1a. Can be made. FIG. 14 shows a case where the carriage 40 moves forward, and FIG. 15 shows a case where the carriage 40 retreats. The guide rail 30 'has been described as having a substantially U-shaped cross-sectional shape. However, in the present invention, the guide rail 30' may have a substantially L-shaped cross-sectional shape or a substantially H-shaped cross-sectional shape. good.

  Moreover, in this invention, as shown to FIGS. 16-1 and 16-2, you may convey with the trolley | bogie 50 in the state which laminated | stacked the some annular | circular shaped water shielding block 11. As shown in FIG. According to this, it can prevent that the annular | circular shaped water shielding block 11 in conveyance falls. Furthermore, in this invention, as shown to FIGS. 17-1 and 17-2, the trolley | bogie 60 with a support mechanism which supports this annular | circular shaped water shielding block 11 in the aspect which penetrates the hollow part 12 of the annular | circular shaped water shielding block 11 is shown. You may convey by. Also by this, it can prevent that the annular | circular shaped water shielding block 11 in conveyance falls.

It is front view sectional drawing which showed typically the structure of the impermeable layer for embedding processes in embodiment of this invention. It is side view sectional drawing which showed typically the structure of the impermeable layer for embedding processes in embodiment of this invention. It is the front view which showed the annular | circular shaped water shielding block shown to FIG. 1 and FIG. 2, and has shown one part in the cross section. It is the front view which showed the disk-shaped water-impervious block shown to FIG. 1 and FIG. 2, and has shown one part in the cross section. It is the front view which showed typically the construction example of the cylindrical accommodating part shown in FIG. 1 and FIG. 2, and has shown one part in the cross section. It is side surface sectional drawing which showed typically the construction example of the cylindrical accommodating part shown in FIG. 1 and FIG. It is the front view which showed typically the construction example of the cylindrical accommodating part shown in FIG. 1 and FIG. 2, and has shown one part in the cross section. It is side surface sectional drawing which showed typically the construction example of the cylindrical accommodating part shown in FIG. 1 and FIG. It is the front view which showed typically the construction example of the cylindrical accommodating part shown in FIG. 1 and FIG. 2, and has shown one part in the cross section. It is side surface sectional drawing which showed typically the construction example of the cylindrical accommodating part shown in FIG. 1 and FIG. It is the front view which showed typically the construction example of the cylindrical accommodating part shown in FIG. 1 and FIG. 2, and has shown one part in the cross section. It is side surface sectional drawing which showed typically the construction example of the cylindrical accommodating part shown in FIG. 1 and FIG. It is the front view which showed typically the construction example of the column-shaped obstruction | occlusion part shown in FIG. 1 and FIG. 2, and has shown one part in the cross section. FIG. 3 is a side sectional view schematically showing a construction example of the columnar blocking portion shown in FIGS. 1 and 2. It is the front view which showed typically the construction example of the column-shaped obstruction | occlusion part shown in FIG. 1 and FIG. 2, and has shown one part in the cross section. FIG. 3 is a side sectional view schematically showing a construction example of the columnar blocking portion shown in FIGS. 1 and 2. It is the front view which showed typically the construction example of the column-shaped obstruction | occlusion part shown in FIG. 1 and FIG. 2, and has shown one part in the cross section. FIG. 3 is a side sectional view schematically showing a construction example of the columnar blocking portion shown in FIGS. 1 and 2. It is the front view which showed typically the construction example of the column-shaped obstruction | occlusion part shown in FIG. 1 and FIG. 2, and has shown one part in the cross section. FIG. 3 is a side sectional view schematically showing a construction example of the columnar blocking portion shown in FIGS. 1 and 2. It is side view sectional drawing which showed typically the filling by a filler. It is the front view which showed typically the modification of embodiment of this invention, and has shown one part in the cross section. It is the front view which showed typically the modification of embodiment of this invention, and has shown one part in the cross section. It is the front view which showed typically the modification of embodiment of this invention, and has shown one part in the cross section. It is sectional drawing seen from the side which showed typically the modification of embodiment of this invention. It is the front view which showed typically the modification of embodiment of this invention, and has shown one part in the cross section. It is sectional drawing seen from the side which showed typically the modification of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel 1a Covering 3 Waste 10 Cylindrical storage part 11 Circular water shielding block 12 Hollow part 13 Inner reinforcement frame 13a Engagement protrusion 13b Engagement recessed part 14 Outer reinforcement frame 14a Engagement protrusion 14b Engagement recessed part 20 Cylindrical blockage Part 21 Disc-shaped impermeable block 22 Outer reinforcing frame 22a Engaging protrusion 22b Engaging recess 30, 30 'Guide rail 31, 31' Opening part 32, 32 'Flat part 40, 50 Cart 60 Cart with support mechanism

Claims (2)

Formed by laminating a plurality of annular water shielding blocks made of clay-based water shielding material along the longitudinal direction of the tunnel inside the tunnel having a substantially circular cross section, and waste is stored in the hollow portion A cylindrical storage section;
A disc-shaped water shielding block made of a clay-based water shielding material and stacked in the cylindrical storage portion in a mode of closing the hollow portion, and is used for embedding the waste. In the water layer,
The annular water barrier block and the disc-shaped water shield block, Ri formed with a respective peripheral curved portion reinforcing frame body for reinforcing the,
The annular impermeable block and the disc-shaped impermeable block are allowed to be displaced along the longitudinal direction of the tunnel in a manner spaced from the inner wall surface of the tunnel, and the annular impermeable block and the circle Provided with a guide member that regulates the laminating position of the plate-shaped impermeable block,
It said guide member, shielding for embedded processing, characterized that you guide the conveying device for conveying the annular water barrier block and the disc-shaped water shield block movable along the longitudinal direction of the tunnel Water layer.   The impermeable layer for embedding treatment according to claim 1, further comprising engaging means for engaging adjacent reinforcing frame bodies.

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