JP6513750B2 - Drainage sheet - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a drainage sheet for releasing spring water spouted from a wall surface.

Construction work for mountain tunnels involves digging and forming mountains, but it is necessary to form a layer of sheets, mortar, concrete, etc. on the surrounding wall for reinforcement.
And a drainage sheet is provided as a measure against spring water from the surrounding wall.

As a construction method, the drainage sheet is attached on the primary lining concrete placed on the excavated surface, and the waterproof sheet is placed on the attached water-conveying sheet, and the secondary lining concrete is placed on the drainage sheet. Ru.
Thus, by attaching the drainage sheet to the wall surface, the spring water travels along the drainage sheet and is efficiently guided to the foot of the wall.

  At present, drainage sheets of various shapes have been developed. For example, as shown in Patent Document 1, a plurality of linear bodies cross each other and change their direction in the horizontal direction and in the thickness direction irregularly. A sheet-like net-like body extending from one side to the other and these linear bodies are adhered to each other at a part of the intersection points is one side of the water impermeable sheet through the adhesive thin layer sheet. There is a water-conveying sheet laminated along the length direction in the middle part of the.

  In addition, as a drainage sheet of another shape, as shown in Patent Document 2, an elastic member having water permeability is disposed and fixed along one longitudinal side of the sheet main body on one side of the sheet main body formed in a band shape. There has also been developed a water-conveying sheet in which an attachment belt is integrally provided along the longitudinal direction of the sheet body at the side edge of the sheet body.

Moreover, since the drainage sheet mentioned above is manufactured combining a some member, there exists a problem that a manufacturing process becomes complicated and a manufacturing cost increases, but it is a stand as shown to patent document 3 as what solves this. A drainage sheet has been developed which has a large number of formed water guiding ribs and which has a sufficient drainage capacity and which is easy to manufacture.
By the way, recently, in construction work such as mountain tunnel, a new construction method different from the conventional method has been adopted.

One of them is the back smooth tunnel lining method (hereinafter referred to as "new tunnel method").
For this construction method, “spray concrete construction” → “lock bolt construction” → “drainage sheet installation” → “waterproof sheet installation formwork installation” → “backfill filler injection” → “formwork removal” → “covering It is carried out in the process of "placement of engineering concrete".

In these steps, after the drainage sheet is attached, a backfill filler (for example, mortar material) is filled thereon.
That is, the backfilling material intervenes between the drainage sheet and the waterproof sheet.
As a result, there arises a problem that the filler material intrudes from the attachment portion of the drainage sheet to the wall surface to the back side (ie, the wall surface side of the drainage sheet).

Specifically, the backfill filler enters from the slight gap between the wall surface and the attached portion of the drainage sheet to the back side, and the filler penetrates to the water conveyance portion of the water provided on the drainage sheet, and the drainage portion is filled with filler By embedding, the drainage function inherent in the drainage sheet may be lost.
Such a problem is also a phenomenon that occurs even if the water transfer part has a network structure.
These are inevitably problems as new construction methods having different procedures are developed.

  When filling the backfilling filler from above the drainage sheet, the bondability between the drainage sheet and the backfilling filler becomes a problem.
  Although the outer side of the drainage sheet is hardened by the backfilling filler, there is a problem that the peeling phenomenon occurs between the both while being subjected to vibration etc. for a long time after construction.

JP 2001-59399 A JP 2002-54396 A Japanese Patent Application Laid-Open No. 2002-21492

The present invention has been developed to solve the above problems.
That is, the present invention provides a drainage sheet which can greatly improve the bonding property between the drainage sheet and the backfilling material so that peeling does not occur between the drainage sheet and the backfilling material after construction. To aim.

  As a result of intensive studies based on the background of the problems as described above, the present inventors have found that the above problems can be solved by providing a special structure to the attachment portion of the drainage sheet, based on the findings. The present invention has been completed.

That is, the present invention provides (1), more become a large number of water guide rib which is formed upright from the bottom plate and the bottom surface plate, induce water, and the water conduit for draining, for attachment to a wall of the water conduit The drainage sheet includes an attaching portion and a bonding reinforcing portion is formed on the back surface of the bottom plate to strengthen the bonding property with the backfilling material .
Moreover, this invention exists in the drainage sheet as described in said (1) which forms (2) a joining reinforcement part in which the biting rib is formed in the back surface of a baseplate.
Further, the present invention resides in (3) the drainage sheet according to the above (2), wherein the biting rib is integrally formed with the bottom plate along the length direction.
Moreover, this invention exists in the drainage sheet as described in said (1) which adhere | attaches or fuse | melts a short fiber or a nonwoven fabric to the back surface of (4) joint surface adhesion | attachment part.
Moreover, this invention exists in the drainage sheet as described in said (1) which adhere | attaches or fuse | melts a granular material to the back surface of (5) bottom plate in the (5) junction reinforcement part.
Moreover, this invention exists in the drainage sheet as described in said (1)-(4) in which the said bottom plate is formed with semi-transparent or transparent synthetic resin as (6).

  In addition, as long as the object of the present invention is achieved, a configuration in which the above-described inventions are combined appropriately can be adopted.

The present invention comprises a bottom plate and a large number of water guiding ribs formed upright from the bottom plate, and has a water guiding portion for guiding water and discharging water, and a water intrusion preventing function, and the water guiding portion has a wall surface And a joint reinforcing portion for strengthening the bonding property with the backfilling filler on the back surface of the bottom plate.
Therefore, by forming the joint reinforcing portion 11A on the back surface of the bottom plate 11 to strengthen the bondability with the backfill filler K2, the peeling phenomenon between the back surface of the bottom plate 11 and the backfill filler K2 occurs. It does not occur.
By bonding or fusing the short fibers or the non-woven fabric to the back surface of the bottom plate 11, the bonding / reinforcing portion 11A bites into the backfilling filler K2, and the bonding property is improved.
When the bonding / reinforcing portion 11A is formed by bonding or fusing the granular body to the back surface of the bottom plate 11, the contact area with the backfilling filler is increased, and the bonding property is improved.

FIG. 1 is a perspective view showing the drainage sheet of the present embodiment. FIG. 2 is a cross-sectional view in the lateral direction of the drainage sheet of the present embodiment. FIG. 3 is an enlarged cross-sectional view showing a mounting portion in which a sealing rib is formed. FIG. 4 is an enlarged sectional view showing a state in which the sealing rib of FIG. 3 is pressed against a wall surface. FIG. 5 is an enlarged cross-sectional view showing a mounting portion in which sealing ribs having different thicknesses are formed. FIG. 6 is an enlarged cross-sectional view showing a mounting portion in which sealing ribs having different heights are formed. FIG. 7 is an enlarged cross-sectional view showing a mounting portion in which sealing ribs having different thicknesses and heights are formed. FIG. 8 is an enlarged cross-sectional view showing a mounting portion in which a sealing rib having a slope is formed. FIG. 9 is an enlarged sectional view showing a state in which the sealing rib of FIG. 8 is pressed against the wall surface. FIG. 10 is an enlarged cross-sectional view showing an example in which narrow grooves are formed in the longitudinal direction on the back surface of the attachment portion. FIG. 11 is a block diagram showing an example of installation of drainage sheet (new tunnel method). FIG. 12 is a view showing a schematic cross section of the tunnel after the construction in FIG. 11 is performed. FIG. 13 shows an X-X cross section of FIG. Drawing 14 is an explanatory view showing the state where the drainage sheet of this embodiment was wound. FIG. 15 is a perspective view showing the drainage sheet of the second embodiment. FIG. 16 is a cross-sectional view in the lateral direction of the drainage sheet of the present embodiment. FIG. 17 shows that the bonding / reinforcing part is formed by bonding the short fiber F to the back surface of the bottom plate, (A) shows a cross-sectional view of the drainage sheet in the transverse direction, and (B) is one of the bonding reinforcing part. The section is shown enlarged. FIG. 18 shows that the bonding / reinforcing portion is formed by bonding a non-woven fabric to the back surface of the bottom plate, (A) shows a cross-sectional view of the drainage sheet in the transverse direction, and (B) enlarges a part of the bonding / reinforcing portion Show. FIG. 19 shows that the bonding / reinforcing portion is formed by bonding the granular material to the back surface of the bottom plate, (A) shows a cross-sectional view of the drainage sheet in the transverse direction, and (B) is a part of the bonding / reinforcement portion Is shown enlarged. FIG. 20 shows a joint-strengthened portion formed by forming a biting rib on the back surface of the bottom plate along the longitudinal direction of the drainage sheet, and (A) shows a transverse sectional view of the drainage sheet, B) shows a part of the joint reinforcement in an enlarged manner.

First Embodiment
One embodiment of the present invention will be described using the drawings.
FIG. 1 is a perspective view showing the drainage sheet of the present embodiment, and FIG. 2 is a cross-sectional view of the drainage sheet of the present embodiment in the lateral direction.
As shown in FIG. 1, the drainage sheet A of this embodiment includes a water guiding portion 10 for guiding water and draining water, and two for attaching the drainage sheets A provided at both ends of the water guiding portion 1 to a wall surface. It consists of two mounting parts 20.
And the water conveyance part 10 is equipped with the bottom plate 11 and the many water conveyance rib 12 which stood up perpendicularly from the bottom plate 11 and was formed.

A water guiding channel 14 in which water flows is formed between the pair of water guiding ribs 12, and the water is guided and guided by the water guiding ribs 12 in the length direction thereof.
The height of the water guiding rib 12 and the distance between the water guiding ribs 12 are not particularly limited, and it may be necessary according to the amount of spring water per unit time of the actual work site, the environment around the spring point, etc. It is preferable to select one that is suitable.

For example, in the case of the drainage sheet A of the present embodiment, the height of the water guiding rib 12 is 5 to 15 mm, and the distance between the water guiding ribs 12 is 5 to 20 mm.
When the drainage capacity of the drainage sheet A is to be increased, it is preferable to subject the bottom plate 11 and the water guiding rib 12 to a water repellent treatment.

  Since the drainage sheet A is formed of a synthetic resin, it can be integrally manufactured by extrusion molding or the like, and can be manufactured easily and in large quantities.

The manufactured drainage sheet A has flexibility unique to synthetic resin and has a so-called waist due to the provision of the water guiding rib 12. For example, when one end of the drainage sheet A is gripped, the other end is It descends and the whole takes on a suitable curved surface shape.
Therefore, the mounting operation along the shape of the wall surface to be constructed (for example, the curved surface shape of the tunnel wall surface) can be easily performed.

  Further, since the drainage sheet A is formed of an impermeable synthetic resin, the spring water does not leak out to the work site through the drainage sheet A, and the spring water does not adversely affect the environment of the work site.

It is particularly preferable to use a translucent or transparent synthetic resin as a material for forming the bottom plate 11 and the water guiding rib 2.
By forming at least the bottom plate 11 with a translucent or transparent material, the drainage condition of the spring water flowing through the water conveyance unit 10 can be visually recognized, and management of the drainage sheet A at the time of construction or after construction becomes simple.
In addition, when the drainage sheet A is attached to a construction site where precipitation of free lime is likely to occur, clogging of the water conveyance portion 10 can be checked at first glance, which enables efficient maintenance work and maintenance.
From the above viewpoints, a material suitable as a material for forming the water conveyance portion 10 and the attachment portion 20 is polypropylene, polyethylene or the like.

As shown in FIG. 2, the attachment portions 20 are plate-like members and are provided on the left and right sides of the water conveyance portion 10.
The mounting portion 20 and the bottom plate 11 are integrated, and the mounting portion 20 is formed to extend outward from the bottom plate 11.
The attachment portion 20 is formed on the same plane as the bottom plate 11.
From the viewpoint of strength, it is preferable that a part of the mounting portion 20 be thick.

FIG. 3 is an enlarged cross-sectional view showing the mounting portion 20 in which the sealing rib 21 is formed.
In this case, since the drainage sheet A can be manufactured by extrusion molding, it is easily possible to make part of the mounting portion 20 thick.

And in the attachment portion 20, a plurality of (in this case, four) rib-like sealing ribs 21 are formed at intervals in the longitudinal direction of the drainage sheet A. It stands in the same direction as the rib.
Since a plurality of sealing ribs 21 are provided at intervals, it is possible to prevent the penetration of the backfill filler into the interior in multiple stages.
The sealing rib 21 is formed so that its thickness gradually decreases toward the tip, is flexible, and easily conforms to the wall surface.

The sealing rib 21 is more flexible than the water guiding rib for guiding water, and can elastically oppose the surface of the sprayed concrete.
The mounting portion 20 is mounted on the blown concrete surface K1 using a driving pin P or the like, in which case the sealing rib 21 resiliently presses the concrete surface K1.

FIG. 4 shows a state in which the sealing rib 21 of FIG. 3 elastically presses the sprayed concrete surface K1.
For this reason, there is no gap between the mounting portion 20 and the sprayed concrete surface K1, so that the backfilling filler K2 enters the back side and penetrates the water conveyance portion provided in the drainage sheet A. There is no.
The four sealing ribs 21 preferably have a smaller thickness in the two sealing ribs 21 inside the two sealing ribs 21 on both end sides (both outer sides).

FIG. 5: is a figure which expands and shows the attachment part 20 part in which the sealing rib 21 with which thickness differs differs.
When the thickness is small, flexibility is increased and flexibility is increased. However, when the driving pin P is driven in between the sealing ribs 21 at both ends, the bending of the inner sealing ribs 21 (two) is large. The sealing ribs 21 located at both ends can strongly press the surface when it is pressed.
By pressing the inner sealing rib 21 (two), the sealing rib 21 at both ends is strongly in contact with the blown concrete surface K1, and a spring effect is exhibited.
The four sealing ribs 21 preferably have a distance L lower than the heights of the sealing ribs 21 at both ends (both outer sides) of the two sealing ribs 21 on the inner side, thereby similarly The spring effect is increased.

FIG. 6 is an enlarged cross-sectional view showing the mounting portion 20 in which the sealing ribs 21 having different heights are formed.
Further, by making the thickness of the two inner sealing ribs 21 lower than the height of the sealing ribs 21 at both ends (both outer sides) by a distance L and reducing the thickness, a larger spring effect can be exhibited.

FIG. 7 is an enlarged cross-sectional view showing a mounting portion 20 in which sealing ribs 21 having different thicknesses and heights are formed.
Moreover, it is preferable that the sealing rib 21 is inclined toward the outer side of the tip.

FIG. 8 is an enlarged sectional view showing the mounting portion 20 in which the sealing rib 21 having the slope is formed.
From the beginning, since the sealing rib 21 is provided with a slope, when the mounting portion 20 is pressed against the shot concrete surface K1, the direction of the slope matches the outside, and the penetration of the backfill filler K2 is ensured. To prevent.

FIG. 9 is an enlarged sectional view showing a state in which the sealing rib 21 shown in FIG. 8 is pressed against the blown concrete surface K1.
When the fluid pressure is applied to the sealing rib 21 in this state, the sealing rib 21 is further inclined and the sealing force is increased.
By the way, although the drainage sheet drives and fixes the driving pin P, it is important that the driving pin P is driven properly.

FIG. 10 is an enlarged cross-sectional view showing an example in which the narrow groove G is formed in the longitudinal direction on the back surface of the attachment portion.
As described above, it is preferable that the narrow groove G be formed along the length direction on the back surface (the opposite side to the side on which the sealing rib 21 is provided) of the attachment portion 20 of the drainage sheet.
The narrow groove G is for positioning when the driving pin is driven in, and the driving pin can be fixed in a stable state without slipping.

  In the drainage sheet A of the present invention, since the bottom plate 11 and the attachment portion 20 are integrally formed, the both are very firmly coupled to each other, and it becomes difficult to damage or the like.

On the wall surface to which the drainage sheet A of the present invention is attached, the spring water flowing out flows into the water conduit 14 divided by the water conveyance ribs 12 adjacent to both sides, and is drained downward along the water conveyance ribs 12.
That is, the water that has entered the drainage sheet A flows straight along the individual water conduits 14 so as to be guided by the water guiding ribs 12, so the water flow paths are organized and collisions between the water flows do not occur.
As a result, the water drainage capacity will be greatly enhanced.

Next, a mounting example of the drainage sheet will be described.
FIG. 11 is a block diagram showing a mounting example of the drainage sheet of this embodiment.
Attachment of drainage sheet is to be constructed in one process of "new tunnel method".

  Here, as mentioned above, the new tunnel method is usually “spray concrete construction” → “lock bolt construction” → “drainage sheet installation” → “waterproof sheet installation formwork installation” → “backfill filler injection” → → "form removal" → "backing concrete placement" will be carried out sequentially through the process.

First, concrete is sprayed on the excavated surface after excavating the tunnel.
Then, a lock bolt (not shown) is driven into an appropriate portion of the sprayed concrete surface K1 formed by spraying in order to maintain the strength.
Next, the drainage sheet A is attached onto the surface of the blown concrete, and the portion of the mounting portion 20 of the drainage sheet A is fixed using a driving pin P or the like which is a fixing tool.

Then, after the drainage sheet A is attached, a waterproof sheet attaching formwork is installed, and the waterproof sheet B is supported in a curved surface shape (here, arch shape) by the formwork.
Next, a filling material K2 (mainly mortar material etc.) is filled between the drainage sheet A and the waterproof sheet B.
Thereafter, the formwork is removed, and lining concrete K3 is further cast from the top of the waterproof sheet A.

FIG. 12 is a view showing a schematic cross section of the tunnel after the construction in FIG. 11 is performed.
Moreover, FIG. 13 shows the XX cross section of FIG.
Thus, the drainage sheet A of this embodiment is attached so that the water conveyance rib 12 may follow the inner periphery of the curved wall surface (for example, the shot concrete surface sprayed on the digging surface of the tunnel).
A layer of backfilling filler K2 is formed thereon, a waterproof sheet B is further provided, and a lining concrete layer K3 is formed thereon.
The drainage sheet A is thus attached along the arched wall surface, whereby the spring water is guided in the direction of the arrow and is flushed away in the direction of the base of the tunnel wall.

  By the way, it is also possible to provide a drainage sheet A, backfill filler K2, waterproof sheet B, and lining concrete layer K3 on the lining concrete layer K3 to form a multistage drainage structure.

By forming the wall surface structure as described above on the excavated surface of the tunnel, it is possible to efficiently discharge the spring water spouted from the excavated surface.
When there is a concern that soil particles may flow out from the excavated surface, a filter material having water permeability such as non-woven fabric is disposed on the excavated surface, and then the drainage sheet A is attached.
As a result, it is possible to eliminate as much as possible the possibility of the soil particles falling into the water delivery unit 10 and causing clogging.

  By the way, since the drainage sheet A is a long sheet extruded by a synthetic resin, as shown in FIG. 14, it can be transported in a wound state, and storage is easy.

Second Embodiment
Next, a second embodiment of the present invention will be described.
FIG. 15 is a perspective view showing the drainage sheet of the second embodiment. FIG. 16 is a cross-sectional view in the lateral direction of the drainage sheet of this embodiment.
As shown in the figure, the drainage sheet A according to the present embodiment is provided with a water guiding portion 10 for guiding and draining water and drainage sheets A provided at both ends (both sides) of the water guiding portion 10 on a wall surface. And two mounting portions 20.

The water conveyance portion 10 includes the bottom plate 11 and a large number of water conveyance ribs 12 vertically erected from the bottom plate 11 in the same manner as the first embodiment described above. In the second embodiment, the attachment portion 20 is largely different from the first embodiment.
That is, the mounting portion 20 does not have the sealing rib 21 and is a hollow portion 20A having a rectangular cross section. The hollow portion 20A is deformed to exhibit elasticity.
A driving pin or the like is driven in from above the hollow portion 20A to fix the mounting portion 20 on the concrete surface. In this case, the hollow portion 20A strongly presses the concrete surface to exhibit an intrusion preventing function.

Third Embodiment
Next, a third embodiment of the present invention will be described.
The drainage sheet A of the present embodiment is a water guiding portion 10 for guiding and draining water, and two attachment portions 20 for attaching the drainage sheets A provided on both ends (both sides) of the water guiding portion 10 to a wall surface. It is the same as the embodiment described above.
However, the difference is that a bonding reinforcing portion 11A is formed on the back surface of the bottom plate 11 in order to strengthen the bonding property with the backfilling filler K2.
If the bottom plate 11 has poor bondability with the backfilling filler K2, the peeling phenomenon may occur between the two while receiving vibration and the like after construction.

In this construction method (see FIG. 11 and FIG. 12), the outside of the bottom plate 11 is hardened by the backfilling filler K2, but after construction, a peeling phenomenon occurs between the two while receiving vibration etc. for a long time Sometimes.
This peeling phenomenon is less likely to occur as the bonding strength between the bottom plate 11 and the backfilling filler K2 is higher.
In this embodiment, the back surface of the bottom plate 11 is formed with a portion that strengthens the bonding property with the backfilling material K2, that is, the bonding reinforced portion 11A.

FIG. 17 shows the joint reinforcing portion 11A in which the short fibers F are adhered to the back surface of the bottom plate 11. FIG. 17 (A) shows a transverse sectional view of the drainage sheet, and FIG. 17 (B) Shows an enlarged part of the joint strengthening portion 11A.
In this case, the short fiber F is fixed to the back surface of the bottom plate 11 via the adhesive R.
The short fibers F may be sprayed and fixed in a state in which the adhesive R is applied to the back surface of the bottom plate 11.
With such a structure, the short fibers F are entangled and embedded in the backfill filler K2, and the bonding force between the backfill filler K2 and the bottom plate 11 is strengthened.

FIG. 18 shows that the bonding / reinforcing part 11A is formed by bonding the non-woven fabric N to the back surface of the bottom plate 11, FIG. 18 (A) shows a cross-sectional view of the drainage sheet in the lateral direction, and FIG. A part of reinforcement part 11A is expanded and shown.
In this case, the non-woven fabric N is fixed to the back surface of the bottom plate 11 via the adhesive R.
FIG. 18 (A) shows the whole drainage sheet, and FIG. 18 (B) shows an enlarged part of the joint reinforcing portion 11A.
The short fibers F and the non-woven fabric N can be fused and fixed to the back surface of the bottom plate 11 immediately upon extrusion molding of the bottom plate 11.

  The backfilling filler K2 penetrates into the yarn of the non-woven fabric N, becomes entangled and becomes buried, and the bonding force between the backfilling filler K2 and the bottom plate 11 is strengthened.

FIG. 19 shows the joint reinforcing portion 11A in which the granular material S is adhered to the back surface of the bottom plate 11. FIG. 19 (A) shows a cross-sectional view in the lateral direction of the drainage sheet, and FIG. Shows an enlarged part of the joint strengthening portion 11A. In this case, the granular material S is sprayed in a state in which the adhesive R is applied to the back surface of the bottom plate 11.
As another method, it is also possible to spray and secure the granular material S on the back surface of the bottom plate 11 immediately after the bottom plate 11 is extruded during extrusion molding.
Due to the presence of the particulate matter S, the contact area with the backfilling filler K2 is increased, and the bondability between the two is enhanced.
Here, sand or the like is preferably employed as the granular body S.

Further, FIG. 20 shows that the joint strengthening portion 11A is formed by forming a biting rib L on the back surface of the bottom plate 11 along the length direction of the drainage sheet, and FIG. 20 (A) is a cross section of the drainage sheet in the horizontal direction. A figure is shown and Drawing 20 (B) expands and shows a part of junction strengthening part 11A.
Since the bottom plate 11 is formed by extrusion, it is possible to simultaneously extrude the integrally formed biting rib L by the design of the extrusion die.
By embedding the biting ribs L in the backfilling filler K2, the bonding property between the bottom plate 11 and the backfilling filler K2 is greatly improved.
Although this bite rib L has a bent portion at the tip in the figure, it is not necessary to necessarily have this bent portion, as long as an anchoring effect can be exhibited.
Further, by making the bending of the tip sharper, it becomes a non-return rib and a more effective throwing effect can be obtained.

Although the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible.
For example, the number, the height relationship, and the thickness relationship of the sealing ribs 21 of the mounting portion 20 can be changed, and the degree of inclination of the sealing ribs 21 or the presence or absence of the inclination is free.

10 ・ ・ ・ Water transfer part 11 ・ ・ ・ Bottom plate 11
11A ··· Bonding reinforced portion 12 ··· Water guiding rib 14 ··· Water guiding channel 20 ··· Mounting portion 20A ··· Hollow portion 21 ··· Sealing rib A ··· Drainage sheet B ··· Tarpaulin K1 · · · · Shotcrete (sprayed concrete)
K2 ···· back-filling filler K3 ···· lining concrete P ····· driving pin G ····· narrow groove N ····· non-woven fabric R ····· adhesive F · ································································· Ribbed bite rib

Claims (5)

A drainage sheet comprising a bottom plate and a large number of water guiding ribs erected from the bottom plate, and a water guiding portion for guiding water and discharging water, and a mounting portion for attaching the water guiding portion to a wall surface There,
A joint reinforcing portion is formed on the back surface of the bottom plate to enhance the bondability with the backfilling material,
Drainage sheet, characterized in der Rukoto that the bonding enhancement portion to form a rib bite into the back surface of the bottom plate. The drainage sheet according to claim 1 , wherein the biting rib is formed integrally with the bottom plate along the length direction.   The drainage sheet according to claim 1, wherein the bonding / reinforcing portion is formed by adhering or fusing a short fiber or a non-woven fabric to the back surface of the bottom plate.   The drainage sheet according to claim 1, wherein the bonding / reinforcing portion is formed by bonding or fusing particles on the back surface of the bottom plate. The drainage sheet according to any one of claims 1 to 3 , wherein the bottom plate is formed of a translucent or transparent synthetic resin.

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