JP2017089261A - Drainage material and drainage structure of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage material and a drainage structure of a tunnel that drain inflow water from a ground side for certain, make a working surface of a waterproof sheet smooth, and curtail work time.SOLUTION: A drain material 11 includes: a water conduction space formation material 23 having a plurality of protruded strips 25 formed integrally on a surface of a band body 13 opposite a natural ground side of an excavated tunnel, the protruded strips forming a water conduction space 27 therebetween and the band body being made of a thermoplastic resin, having flexibility and water shielding property, and being flat on front and rear surfaces, and furthermore the water conduction space forming material having a length in a longitudinal direction that equals or is longer than a length from a ceiling part to a side bottom part of the excavated tunnel; and a water-permeable filter material 29 fixed at a tip of the protruded strip 25 and covering the water conduction space 27.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drainage material and a drainage structure of a tunnel.

Various water-conducting materials used for locations with a lot of spring water are known.
In Patent Document 1, protrusions parallel to each other are provided alternately on both surfaces of the flat base of the base sheet, and a water-permeable material as a porous plate is fixed to the tip of the protrusion, A waterproof sheet is disclosed in which a water passage is formed on both surfaces of a base sheet by a gap and a water-permeable material.
Patent Document 2 discloses a thermoplastic resin plate-like drainage material in which a corrugated plate of a resin plate having a protruding portion is sandwiched between non-woven fabrics and the covering surface of the non-woven fabric resin plate is coated and bonded using an adhesive. .
Patent Document 3 discloses a single sheet having a water-permeable layer and an impermeable layer. The water flow layer is provided with a plurality of flow paths (grooves) running parallel to the surface, and the flow path walls are made of a synthetic resin film. This flow path wall has an open structure, and a fixing sheet (nonwoven fabric or woven fabric) is joined to secure flow path gaps on the upper and lower surfaces of the flow path wall. The sheet may be any sheet as long as it can ensure voids, and is preferably a coarse sheet having a high water permeability, particularly a nonwoven fabric.

JP-A-64-062599 Japanese Utility Model Publication No. 48-067518 JP-A-5-195696

  However, when the above-described conventional water guiding material is attached with the flow channel facing the inner surface of the primary lining, the flow channel is likely to be clogged over time due to adhesion of free lime from the inner surface of the primary lining. Moreover, if there is unevenness on the mine side of the water guide material, the smoothness of the waterproof sheet construction surface is lowered, and cracking is likely to occur due to the back restraint of the secondary lining concrete. Furthermore, when all the waterproof sheets are used as the water guiding material, the cost increases and the work becomes complicated.

  The present invention has been made in view of the above situation, and its purpose is to ensure that the spring water from the natural mountain side can be drained to the side bottom, and the waterproof sheet construction surface can be smoothed, and the work time for construction can be reduced. It is to provide a drainage material that can be shortened and a drainage structure of a tunnel.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
The drainage material 11 according to claim 1 of the present invention is made of a thermoplastic resin that has flexibility and water-blocking property, and has a flat surface 13 that faces the ground side of the tunnel excavation tunnel. A plurality of convex portions to be the water space 27 are integrally formed, and the water flow space forming member 23 having a longitudinal direction having a length from at least the ceiling portion 15 to the side bottom portion 17 of the tunnel digging tunnel,
A filter material 29 having water permeability, fixed to the protruding tip of the convex portion, and covering the water flow space 27;
It is characterized by comprising.

Since the drainage material 11 is formed in a belt shape, it can be locally attached to a portion of the primary lining inner surface where there is a particularly large amount of spring water. In addition, since there is no need for extra laying, there is no reduction in material cost and workability due to kinking.
Further, the drainage material 11 has a water flow space 27 disposed on the natural mountain side of the water flow space forming material 23. The water flow space 27 is covered with a filter material 29 on the natural mountain side. Free lime flowing from the inner surface of the primary lining is supplemented by the filter material 29, and entry into the water flow space 27 is suppressed. Thereby, clogging of the water flow space 27 is suppressed over a long period of time. Further, since the drainage material 11 has a flat surface 21 on the side of the mine shaft 18, the waterproof sheet construction surface covering the surface can be smoothed.

The drainage material 11 according to claim 2 of the present invention is made of a thermoplastic resin and has a flexible and water-blocking flat body 13 on the surface facing the natural mountain side of the tunnel excavation tunnel, and between them. A plurality of convex portions to be the water space 27 are integrally formed, and the water flow space forming member 23 having a longitudinal direction having a length from at least the ceiling portion 15 to the side bottom portion 17 of the tunnel digging tunnel,
A non-woven fabric covering the surface of the water passage space forming material 23 on the side of the mine shaft 18 and fixed to the surface on the side of the mine shaft 18;
It is characterized by comprising.

In this drainage material 11, it can affix locally on the location with especially much spring water of a primary lining inner surface. Since there is no need for extra laying, there is no reduction in material cost and workability due to kinking. Moreover, the drainage material 11 can drain the spring water from the natural mountain side to the side bottom 17 by having the water flow space 27 on the natural mountain side.
Further, since the drainage material 11 has a flat surface 21 on the side of the mine shaft 18, the waterproof sheet construction surface covering the surface can be smoothed. Moreover, when the drainage material 11 is covered with the filler layer for secondary lining, the fixing strength with the filler layer is increased by the nonwoven fabric fixed on the surface of the belt 13 on the side of the tunnel 18.

According to claim 3 of the present invention, the drainage material 11 is formed of a thermoplastic resin and has flexibility and water-blocking property, and the flat surface 13 of the front and back surfaces of the drainage material 11 passes through the surface facing the natural mountain side of the tunnel excavation tunnel. A plurality of convex portions to be the water space 27 are integrally formed, and the water flow space forming member 23 having a longitudinal direction having a length from at least the ceiling portion 15 to the side bottom portion 17 of the tunnel digging tunnel,
A filter material 29 having water permeability, fixed to the protruding tip of the convex portion, and covering the water flow space 27;
A non-woven fabric covering the surface of the water passage space forming material 23 on the side of the mine shaft 18 and fixed to the surface on the side of the mine shaft 18;
It is characterized by comprising.

Since the drainage material 11 is formed in a belt shape, it can be locally attached to a portion of the primary lining inner surface where there is a particularly large amount of spring water. Since there is no need for extra laying, there is no reduction in material cost and workability due to kinking. Further, the drainage material 11 has a water flow space 27 disposed on the natural mountain side of the water flow space forming material 23. The water flow space 27 is covered with a filter material 29. Free lime flowing from the inner surface of the primary lining is supplemented by the filter material 29, and entry into the water flow space 27 is suppressed. Thereby, clogging of the water flow space 27 is suppressed over a long period of time.
Further, since the drainage material 11 has a flat surface 21 on the side of the mine shaft 18, the waterproof sheet construction surface covering the surface can be smoothed. Moreover, when the drainage material 11 is covered with the filler layer for secondary lining, the fixing strength with the filler layer is increased by the nonwoven fabric fixed on the surface of the belt 13 on the side of the tunnel 18.

The drainage structure of the tunnel 19 according to claim 4 of the present invention is a drainage structure of the tunnel 19 having the drainage material 11 according to any one of claims 1, 2, 3,
A primary lining, a filler layer, a water shielding sheet 33 and a secondary lining are sequentially provided from the natural ground surface of the tunnel 19,
The drainage material 11 with the water flow space 27 facing the inner surface of the primary lining is embedded in the filler layer along the circumferential direction from at least the ceiling 15 to the side bottom 17 of the tunnel 19. It is characterized by.

  In this drainage structure of the tunnel 19, the tunnel 19 having a higher drainage function can be constructed by using the drainage material 11 that protects the water flow space 27 by sticking the filter material 29 to the natural mountain side. The drainage material 11 can be used as a local water-conducting material when there is more spring than necessary and the waterproof sheet cannot be constructed. According to the drainage structure using the drainage material 11, it is not necessary to construct the sheet drainage material on the entire surface of the natural ground before constructing the waterproof sheet, even in a place with a large amount of spring water. Save time and effort.

According to the drainage material of the first aspect of the present invention, the spring water from the natural mountain side can be drained reliably, and since it is formed in a belt shape, it is locally applied to a portion of the primary lining inner surface where there is particularly much spring water. Can be attached. In addition, since there is no need for extra laying, there is no reduction in material cost and workability due to kinking.
In addition, since the drainage material has a water flow space on the ground mountain side of the water flow space forming material and is covered with the filter material, free lime flowing from the inner surface of the primary lining will be supplemented by the filter material, Intrusion into the water flow space can be suppressed. Thereby, clogging is suppressed over a long period of time in the water flow space, and good drainage can be maintained. Further, since the drainage material has a flat surface on the mine shaft side, it is possible to smooth the construction surface of the waterproof sheet that covers the surface, and from this, the working time for construction can be shortened.

  According to the drainage material of the second aspect of the present invention, a water flow space can be secured, the spring water from the natural mountain side can be drained reliably to the side bottom, and the filler layer for secondary lining by the nonwoven fabric Adhesiveness can be improved.

According to the drainage material of the third aspect of the present invention, the spring water from the natural mountain side can be drained reliably, and since it is formed in a strip shape, it is locally applied to a portion of the primary lining inner surface where there is particularly much spring water. Can be attached. In addition, since there is no need for extra laying, there is no reduction in material cost and workability due to kinking.
In addition, since the drainage material has a water flow space on the ground mountain side of the water flow space forming material and is covered with the filter material, free lime flowing from the inner surface of the primary lining will be supplemented by the filter material, Intrusion into the water flow space can be suppressed. Thereby, clogging is suppressed over a long period of time in the water flow space, and good drainage can be maintained. Further, since the drainage material has a flat surface on the mine shaft side, it is possible to smooth the construction surface of the waterproof sheet that covers the surface, and from this, the working time for construction can be shortened.
Furthermore, when the drainage material is covered with a filler layer for secondary lining, the non-woven fabric fixed on the surface of the beltway on the mine shaft side increases the adhesion to the filler layer and increases the fixing strength. it can.

  According to the drainage structure of the tunnel according to claim 4 according to the present invention, the drainage material that maintains the water flow space can ensure the drainage function reliably and in the long term, and can improve the construction quality of the secondary lining, Moreover, since the drainage material is formed in a belt shape that can be locally applied, a tunnel can be constructed at low cost.

It is a schematic perspective view of the tunnel provided with the drainage material which concerns on embodiment of this invention. It is sectional drawing of the direction orthogonal to the longitudinal direction of the drainage material shown in FIG. It is the perspective view which notched a part of drainage material shown in FIG. It is sectional drawing of the direction orthogonal to the longitudinal direction of the drainage material provided between the natural ground side and the water stop sheet. It is sectional drawing of the direction orthogonal to the longitudinal direction of the drainage material which concerns on the modification which the both ends edge of the width direction of a filter material is not fixed. It is the perspective view which notched a part of drainage material which concerns on the modification with a discontinuous protrusion. It is sectional drawing of the direction orthogonal to the longitudinal direction of the waste_water | drain_material which concerns on the modification which a convex part consists of several hemispherical protrusion. It is the perspective view which notched a part of drainage material shown in FIG. It is sectional drawing of the direction orthogonal to the longitudinal direction of the drainage material which concerns on the modification with which the recessed part was formed in the front-end | tip of protrusion. It is the perspective view which notched a part of drainage material shown in FIG.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic perspective view of a tunnel provided with a drainage material according to an embodiment of the present invention.
The drainage material 11 according to the present embodiment has a band 13. The band 13 has a length in the longitudinal direction from at least the ceiling 15 to the side bottom 17 in the circumferential direction of the tunnel digging tunnel. Of course, the belt 13 may have a length twice as long as that described above, that is, a length of the inner circumference of the tunnel digging tunnel. Moreover, it is good also as what has the length from the arbitrary positions from the ceiling part 15 to the side bottom part 17 vicinity to the side bottom part 17. FIG. Thus, as for the drainage material 11 which has the belt | band | zone body 13, what was affixed on the natural ground side as the full length of the inner periphery of a tunnel excavation, for example is arrange | positioned at intervals in the extension direction of the tunnel 19 Is done.

2 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the drainage material shown in FIG. 1, and FIG. 3 is a perspective view of the drainage material shown in FIG.
The band 13 is made of a thermoplastic resin and has flexibility and water shielding. The band 13 has a flat surface 21 on the front and back, and a plurality of convex portions are integrally formed on a surface facing the natural ground side of the tunnel boring shaft. That is, in the water flow space forming member 23 having the band 13 as a constituent element, the surface facing the natural mountain side of the tunnel digging tunnel becomes an uneven surface due to the convex portion. In the present embodiment, the convex portion is the ridge 25. The protrusions 25 extend along the longitudinal direction of the band body 13, and a plurality of protrusions 25 are formed in parallel in a direction orthogonal to the longitudinal direction (band width direction). The protrusion 25 has a cross-sectional shape orthogonal to the extending direction, for example, a triangle. The protrusion 25 is formed with a triangular cross section, thereby having high compressive strength and enhanced durability. In addition, the cross-sectional shape of this protrusion 25 may be formed in other shapes, for example, a rectangle, a trapezoid, or a rib shape. In the water flow space forming member 23, the space between the protrusions 25 is a water flow space 27. Therefore, the water that has flowed down from the ceiling portion 15 of the tunnel borehole to the drainage material 11 is guided to the water passing space 27 between the ridges 25 and drained to the side bottom portion 17. That is, the water flow space forming member 23 has a function as a ridge.

  The width of the band 13 is preferably 50 to 300 mm. The height of the ridge 25 is preferably 1 to 30 mm. The water flow space forming member 23 preferably has an area ratio of 20 to 80% with respect to the band of the water flow portion, and the water flow space forming member 23 preferably has a ratio to the entire width of the water flow portion of 5 to 80%. .

In the water flow space forming material 23, the filter material 29 is fixed to the tip of the protrusion 25. The filter material 29 and the water flow space forming material 23 are fixed by welding or adhesion. The filter material 29 has water permeability and covers the water flow space 27.
The filter material 29 is formed in substantially the same band shape as the band 13 and covers the entire surface of the band 13 facing the ground mountain side. In the present embodiment, the filter material 29 is fixed at both ends in the band width direction to both ends of the band 13 by welding or adhesion. This fixing portion becomes the overlapping edge portion 31. The drainage material 11 having the filter material 29 fixed to the water flow space forming material 23 is nailed from the mine shaft 18 side to the overlapping edge portion 31 and fixed to the natural ground side.

  The filter material 29 allows water to pass through, but effectively supplements free lime and the like flowing out from the primary lining inner surface on the natural ground side. For example, a porous material can be used as the filter material 29. The filter material 29 may be a wire aggregate having a so-called noodle block structure. Plant fibers, glass fibers, synthetic fibers, metals, and the like can be used as the material of the wires constituting the wire aggregate. The filter material 29 may be an open-cell sponge such as urethane sponge.

  Furthermore, the filter material 29 does not exclude the use of non-woven fabric. The nonwoven fabric is obtained by depositing organic synthetic fiber filaments such as polyester, polyamide, and polypropylene. Non-woven fabrics are spun-bonded from a spinning nozzle having a large number of orifices by the so-called spunbond method, and a large number of filaments are indexed and stretched with an air jet or the like, blown downward, and the filaments moved horizontally downward. It can be deposited on the surface of the wire mesh conveyor with a predetermined basis weight to obtain a web. However, in this case, the nonwoven fabric preferably has a basis weight in the range of 20 to 150 g / m <2>, more preferably in the range of 30 to 80 g / m <2>, in order to enhance the free lime supplementation. . When the basis weight of the nonwoven fabric is less than 20 g / m @ 2, free lime is likely to permeate, and when the basis weight is greater than 150 g / m @ 2, the water permeability to the water flow space 27 is lowered.

FIG. 4 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the drainage material provided between the natural ground side and the waterproof sheet.
In the drainage structure of the tunnel 19 according to this embodiment, a primary lining, a filler layer, a water shielding sheet 33 and a secondary lining are sequentially provided from the ground surface of the tunnel 19. In the rock bolt / sprayed concrete tunnel method, the so-called NATM method, there is a water shielding between the primary lining sprayed to the natural ground via the lock bolt and the secondary lining on the inner peripheral surface of the tunnel 19. A sheet 33 is interposed. This prevents spring water from the primary lining side from leaking to the secondary lining side.

  The drainage material 11 has a water passing space 27 facing the inner surface of the primary lining, and the overlapping edge 31 is formed by a nail 35 or the like along at least a part of the tunnel 19 in the circumferential direction from the ceiling 15 to the side bottom 17. Fixed and installed. In the illustrated example, a water shielding sheet 33 is pasted on the mine shaft 18 side of the drainage material 11. Secondary lining is performed on the side of the mine shaft 18 of the water shielding sheet 33. In this case, the drainage material 11 is embedded in the filler layer of the secondary lining through the water shielding sheet 33.

Next, the operation of the above configuration will be described.
Since the drainage material 11 according to the present embodiment is formed in a belt shape, it can be locally attached to the inner surface of the primary lining on the natural ground side, in particular, at a location with a lot of spring water. There is no need to lay the front surface of the inner surface of the primary lining, and there is no need for extra laying, so there is no reduction in material costs and no deterioration in workability due to the occurrence of kinking or the like. Further, the drainage material 11 has a water flow space 27 disposed on the natural mountain side of the water flow space forming material 23. The water flow space 27 is covered with a filter material 29. Lime that causes efflorescence, such as free lime flowing from the inner surface of the primary lining, is supplemented by the filter material 29, and entry into the water flow space 27 is suppressed. Further, by using the overlapping edge portion 31 in which both end edges in the band width direction of the filter material 29 and both end edges of the band body 13 are fixed by welding or adhesion, it is possible to prevent lime from entering from the both end edge directions. can do. Thereby, the water flow space 27 is prevented from being clogged for a long period of time, and the drainage function is maintained. Further, since the drainage material 11 has a flat surface 21 on the side of the mine shaft 18, the waterproof sheet construction surface covering the surface can be smoothed.

  In the drainage structure of the tunnel 19 according to the present embodiment, the tunnel 19 having a higher drainage function can be constructed by using the drainage material 11 that protects the water flow space 27 by sticking the filter material 29 to the natural mountain side. . The drainage material 11 can be used as a local water-conducting material when there is a lot of spring water especially at the site of a mountain tunnel or the like, and the construction of the waterproof sheet is not easy. In the drainage structure using the drainage material 11, it is not necessary to construct a sheet-like drainage material on the entire surface of the natural ground before constructing the waterproof sheet even in a place where the amount of spring water is large. Thereby, the labor of construction can be saved.

Next, a modified example of the above configuration will be described.
In the drainage material 11 having the above-described configuration, the non-woven fabric may be fixed by omitting the filter material 29 and covering the surface of the water flow space forming material 23 on the mine shaft 18 side.
In this drainage material 11, when covered with a filler layer for secondary lining, the fixing strength with the filler layer is increased by the nonwoven fabric fixed on the surface of the belt 13 on the side of the tunnel 18. That is, the nonwoven fabric has an anchor effect. As a result, the adhesiveness with the filler layer can be enhanced.

Moreover, the drainage material 11 having the above-described configuration may include the water flow space forming material 23, the filter material 29, and the nonwoven fabric fixed to the surface of the water flow space forming material 23 on the mine shaft 18 side. .
In this drainage material 11, clogging of the water flow space 27 is suppressed over a long period of time, and the drainage function is maintained. Further, the waterproof sheet construction surface can be smoothed. In addition, the non-woven fabric increases the fixing strength with the filler layer. As a result, the spring water from the natural mountain side can be drained reliably, the waterproof sheet construction surface can be smoothed, the working time can be shortened, and the adhesion to the filler layer can be enhanced.

FIG. 5 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the drainage material according to a modification in which both end edges in the width direction of the filter material are not fixed.
The drainage material 37 does not need to fix the both end edges of the band 13 and the filter material 29 as in the above-described embodiment, and does not fix the both side edges of the filter material 29 to the band 13. That is, the drainage material 37 is not formed with the overlapping edge 31.
According to the drainage material 37, it is possible to manufacture at low cost without the need for welding and bonding. Moreover, the margin for bonding the drainage material 37 in the width direction can be formed at both end edges.

FIG. 6 is a perspective view in which a part of the drainage material according to a modification in which the protrusions are discontinuous is cut out.
Further, the drainage material 39 may not be formed with the ridges 25 continuously.
According to the drainage material 39, water can be passed in the width direction, and clogging can be further prevented. Moreover, the drainage material 39 can be easily bent along the curved surface of the natural ground surface, and can improve workability.

FIG. 7 is a cross-sectional view in a direction perpendicular to the longitudinal direction of the drainage material according to a modification example in which the convex portion is composed of a plurality of hemispherical projections, and FIG. 8 is a perspective view in which a part of the drainage material shown in FIG. is there.
Moreover, the drainage material 41 may form a convex part as the hemispherical protrusion 43, and may arrange | position this hemispherical protrusion 43 in matrix form.
According to the drainage material 41, the compressive strength of the convex portion can be increased as compared with the protrusion 25. Thereby, crushing of the water flow space 27 due to, for example, the pressure of the cast concrete can be prevented.

FIG. 9 is a cross-sectional view in a direction perpendicular to the longitudinal direction of a drainage material according to a modification in which a recess is formed at the tip of the protrusion, and FIG. 10 is a perspective view in which a part of the drainage material shown in FIG.
Further, the drainage material 45 can form a recess 49 at the tip of the hemispherical protrusion 47. The filter material 29 is welded or bonded to the recess 49.
According to the drainage material 45, the bonding area between the filter material 29 and the tip of the hemispherical protrusion 47 can be increased, and the fixing strength between the filter material 29 and the water flow space forming material 23 can be increased. In addition, by forming the concave portions 49 in all the hemispherical protrusions 47, the raw material for manufacturing the band 13 integrated with the hemispherical protrusions 47 can be reduced, and the material cost can be reduced.

  Furthermore, as described above, the drainage material may not be integrally formed with the band 13 such as the protrusion 25 having a triangular cross section and the hemispherical protrusions 43 and 45 as a water flow space forming material. What can constitute the water flow space 27 between the band 13 and the filter material 29 only needs to be fixed in a sandwiched state. For example, a wire rod is used as a protrusion and a plurality of lines are arranged in parallel along the longitudinal direction of the band 13. The water passage space 27 is fixed and the water passage space 27, or the porous material having the same structure as the above-described filter material 29 or the linear aggregate having a noodle block structure, has good water permeability and has a compressive strength. The durable material may be integrated by a fixing means such as adhesion.

  Therefore, according to the drainage materials 11, 37, 39, and 41 according to the present embodiment, the spring water from the natural mountain side can be surely drained, the waterproof sheet construction surface can be smoothed, and the working time can be shortened.

  According to the drainage structure of the tunnel 19 according to the present embodiment, a water passage space can be ensured for a long period of time, the construction quality of the secondary lining can be improved, and the drainage material 11 can be locally adapted. Since it is formed, the tunnel 19 having a high drainage function can be constructed at low cost.

DESCRIPTION OF SYMBOLS 11 ... Drainage material 13 ... Band 15 ... Ceiling part 17 ... Side bottom part 18 ... Tunnel 19 ... Tunnel 23 ... Water flow space formation material 25 ... Convex part (ridge)
27 ... Water passage space 29 ... Filter material 33 ... Water shielding sheet 43 ... Protrusion (hemispherical protrusion)
47 ... Convex part (semispherical projection with concave part)

Claims (4)

A plurality of convex portions that are water-permeable spaces are integrally formed on the surface facing the natural mountain side of the tunnel digging tunnel of the front and back flat strips made of thermoplastic resin and having flexibility and water shielding, A water-passing space forming material having a length from at least a ceiling portion to a side bottom portion of the tunnel digging tunnel,
A filter material that has water permeability, is fixed to the protruding tip of the convex portion, and covers the water flow space;
A drainage material characterized by comprising: A plurality of convex portions that are water-permeable spaces are integrally formed on the surface facing the natural mountain side of the tunnel digging tunnel of the front and back flat strips made of thermoplastic resin and having flexibility and water shielding, A water-passing space forming material having a length from at least a ceiling portion to a side bottom portion of the tunnel digging tunnel,
A non-woven fabric that covers the surface on the mine shaft side of the water flow space forming material and is fixed to the surface on the mine shaft side;
A drainage material characterized by comprising: A plurality of convex portions that are water-permeable spaces are integrally formed on the surface facing the natural mountain side of the tunnel digging tunnel of the front and back flat strips made of thermoplastic resin and having flexibility and water shielding, A water-passing space forming material having a length from at least a ceiling portion to a side bottom portion of the tunnel digging tunnel,
A filter material that has water permeability, is fixed to the protruding tip of the convex portion, and covers the water flow space;
A non-woven fabric that covers the surface on the mine shaft side of the water flow space forming material and is fixed to the surface on the mine shaft side;
A drainage material characterized by comprising: A drainage structure of a tunnel having the drainage material according to any one of claims 1, 2, and 3,
A primary lining, a filler layer, a water shielding sheet and a secondary lining are sequentially provided from the surface of the natural ground of the tunnel,
The tunnel characterized in that the drainage material with the water flow space facing the inner surface of the primary lining is embedded in the filler layer along a circumferential direction from at least a ceiling portion to a side bottom portion of the tunnel. Drainage structure.

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