JP2014240596A - Drainage sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drainage sheet that prevents a back-filling filler from making an entry into a backside and that does not deteriorate a drainage function.SOLUTION: A drainage sheet A of the present invention includes a water conveyance part 10 for guiding and discharging water, and an attachment part 20 for attaching the water conveyance part 10 to a wall surface. The water conveyance part 10 and the attachment part 20 are formed of an impermeable synthetic resin, and the attachment part 20 comprises a water intrusion preventing function. Additionally, in the water conveyance part 10, a bottom surface plate 11 and a large number of water conveyance ribs 12 formed by being erected from the bottom surface plate 11 are formed.

Description

  The present invention relates to a drainage sheet for escaping spring water that springs from a wall surface and a wall surface structure thereof.

Mountain tunnel construction works are formed by excavating mountains, but it is necessary to form layers of sheets, mortar, concrete, etc. on the surrounding walls for reinforcement.
A drainage sheet is provided as a countermeasure against spring water from the surrounding wall.

As a construction method, the drainage sheet is mounted on the primary lining concrete cast on the excavation surface, and the waterproof sheet is installed on the attached water guide sheet, and the secondary lining concrete is cast. The
Thus, by attaching the drainage sheet to the wall surface, the spring water is guided through the drainage sheet and efficiently guided to the feet of the wall.

  Currently, drainage sheets of various shapes have been developed. For example, as shown in Patent Document 1, a large number of linear bodies intersect each other and change their directions irregularly in the horizontal direction and in the thickness direction. One side of the impermeable sheet extends from one side to the other, and a sheet-like network formed by adhering these linear bodies to each other at a part of the intersection. There is a water guide sheet that is laminated along the length direction in the middle of the.

  Further, as a drainage sheet of another shape, as shown in Patent Document 2, an elastic member having water permeability is arranged and fixed along the longitudinal direction of the sheet main body on one surface side of the sheet main body formed in a band shape, and A water guide sheet has also been developed in which an attachment belt is integrally provided along the longitudinal direction of the seat body at the side edge of the seat body.

Moreover, since the drainage sheet described above is manufactured by combining a plurality of members, there is a problem that the manufacturing process becomes complicated and the manufacturing cost increases. A drainage sheet having a large number of formed water guide ribs, having a sufficient drainage capacity, and easy to manufacture has been developed.
By the way, recently, in construction work such as a 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”).
This construction method consists of “split concrete construction” → “rock bolt construction” → “drainage sheet installation” → “waterproof sheet installation formwork installation” → “backfill filler injection” → “formwork removal” → “covering” It is performed in the process of “Concreting concrete”.

In these steps, after the drainage sheet is attached, a backfilling material (for example, mortar material) is filled from above.
That is, the backfill filler is interposed between the drainage sheet and the waterproof sheet.
Therefore, there arises a problem that the filler enters from the attachment portion of the drainage sheet to the wall surface into the back side (that is, the wall surface side of the drainage sheet).

Specifically, the backfill filler enters the back side through a slight gap between the wall surface and the drainage sheet mounting part, the filler penetrates to the water guide part of the drainage sheet, and the water guide part is the filler. If it is buried, the original drainage function of the drainage sheet may be lost.
Such a problem is still a phenomenon that occurs even if the water conveyance portion has a network structure.
These are problems that inevitably arise because a new construction method having a procedure different from the conventional one has been developed.

JP 2001-59399 A JP 2002-54396 A JP 2002-21492 A

The present invention has been developed to solve the above problems.
That is, an object of the present invention is to provide a drainage sheet in which the backfilling filler does not enter the back side and does not impair the drainage function.

  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 giving a special structure to the attachment portion of the drainage sheet, and based on the knowledge. This completes the present invention.

  That is, the present invention is a drainage sheet comprising (1) a water guide portion for guiding and draining water, and an attachment portion for attaching the water guide portion to a wall surface, wherein the water guide portion and the attachment portion are The drainage sheet is formed of an impermeable synthetic resin and has a water intrusion prevention function at the attachment portion.

  Further, according to the present invention, (2), the water guide portion is composed of a bottom plate and a plurality of water guide ribs erected from the bottom plate, and a plurality of sealing ribs having a water intrusion preventing function are provided on the attachment portion. It exists in the drainage sheet of the said (1) description formed.

  Moreover, this invention is (3) and the drainage sheet | seat of the said (2) description that a sealing rib is thinner in the inner side than both ends.

  Moreover, this invention exists in the waste_water | drain sheet | seat of the said (2) description whose height is lower when (4) and a sealing rib are inside the both ends.

  Moreover, this invention exists in the drainage sheet | seat of the said (2) description which the (5) and sealing rib incline toward the outer side.

  Moreover, this invention exists in the drainage sheet | seat of the said (1) description in which the hollow part which has a water intrusion prevention function is formed in the attachment part (6).

  Moreover, this invention exists in the drainage sheet of the said (1) description with which the said bottom plate is formed with the semi-transparent or transparent synthetic resin (7).

  Moreover, this invention exists in the drainage sheet of the said (1) description in which the joint reinforcement | strengthening part for strengthening bondability with a backfilling filler is formed in the back surface of (8) bottom plate.

  Moreover, this invention exists in the drainage sheet of said (1) description which (9) joint reinforcement | strengthening part adhere | attaches or fuse | bonds the short fiber or the nonwoven fabric to the back surface of a bottom face board.

  Moreover, this invention exists in the drainage sheet | seat of the said (1) description which (10) joining reinforcement | strengthening parts adhere | attach or fuse | fuse a granular material to the back surface of a bottom face board.

  Moreover, this invention exists in the drainage sheet | seat of the said (1) description which (11) joining reinforcement | strengthening parts bite into the back surface of a bottom face board, and formed the rib.

  Moreover, this invention is attached so that the front-end | tip of the water conveyance rib of the drainage sheet as described in any one of (12) and said (1)-(11) may contact | abut along a curved-shaped wall surface. It exists in the wall structure.

  In addition, as long as the objective of this invention is met, the structure which combined said invention suitably is also employable.

  The present invention is a drainage sheet comprising a water guide portion for guiding and draining water and an attachment portion for attaching the water guide portion to a wall surface, wherein the water guide portion and the attachment portion are impervious to synthesis. It is made of resin and has a water intrusion prevention function at the mounting portion.

Therefore, the backfill filler does not enter the back side of the drainage sheet (that is, the wall surface side of the drainage sheet), and the filler does not enter the water guide portion provided in the drainage sheet.
Therefore, the water conveyance part is not filled with the filler, and the original drainage function of the drainage sheet is maintained.

  The water guide portion is composed of a bottom plate 11 and a plurality of water guide ribs standing upright from the bottom plate 11, and a plurality of sealing ribs having a water intrusion preventing function are formed on the attachment portion. The stop rib 21 prevents the backfill filler from entering in multiple stages.

  Since the sealing rib 21 is thinner on the inner side than both ends, the inner sealing rib 21 becomes flexible, and when driven with a driving pin, the sealing ribs 21 on both ends strongly press the wall surface. Demonstrate effect (spring effect).

  Similarly, the sealing rib 21 exhibits a spring effect by being lower in height on the inner side than both ends.

  Since the sealing rib 21 is inclined toward the outside, a strong sealing force is exhibited.

  When the hollow portion having a water intrusion preventing function is formed in the attachment portion, the adhesion to the wall surface is improved due to the cushioning property of the hollow portion, and the gap is eliminated, so that the backfill filler is prevented from entering.

  By forming the bonding reinforcing portion 11A for reinforcing the bonding property with the backfilling filler K2 on the back surface of the bottom plate 11, the peeling phenomenon between the back surface of the bottom plate 11 and the backfilling material K2 does not occur. .

  Since the bonding strengthening part 11A is made by bonding or fusing short fibers or nonwoven fabrics to the back surface of the bottom plate 11, these bite into the backfilling filler K2 and the bonding property is improved.

  Since the bonding strengthening portion 11A is obtained by adhering or fusing the granular material to the back surface of the bottom plate 11, the contact area with the backfill filler is increased, and the bonding property is improved.

  Since the joining strengthening part 11A is the one in which the biting rib is formed on the back surface of the bottom plate 11, the biting rib is buried in the backfilling filler K2, and the joining property is improved.

FIG. 1 is a perspective view showing a 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 the attachment portion on which the sealing rib is formed. FIG. 4 is an enlarged cross-sectional view showing a state where the sealing rib of FIG. 3 is pressed against the wall surface. FIG. 5 is an enlarged cross-sectional view showing an attachment portion in which sealing ribs having different thicknesses are formed. FIG. 6 is an enlarged cross-sectional view showing a mounting portion on which sealing ribs having different heights are formed. FIG. 7 is an enlarged cross-sectional view showing an attachment portion in which sealing ribs having different thicknesses and heights are formed. FIG. 8 is an enlarged cross-sectional view showing an attachment portion on which an inclined sealing rib is formed. FIG. 9 is an enlarged cross-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 length direction on the back surface of the attachment portion. FIG. 11 is a block diagram showing an example of installation of a drainage sheet (new tunnel method). FIG. 12 is a diagram showing a schematic cross section in the tunnel after the construction in FIG. 11 is performed. FIG. 13 shows an XX cross section of FIG. FIG. 14 is an explanatory view showing a state where the drainage sheet of the present embodiment is wound. FIG. 15 is a perspective view showing a 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 joint strengthening part is formed by adhering short fibers F to the back surface of the bottom plate, (A) shows a cross-sectional view of the drainage sheet in the lateral direction, and (B) shows one of the joint strengthening parts. The part is shown enlarged. FIG. 18 shows that the joint strengthening part is formed by adhering the nonwoven fabric to the back surface of the bottom plate, (A) shows a cross-sectional view of the drainage sheet in the lateral direction, and (B) enlarges a part of the joint strengthening part. Show. FIG. 19 shows that the joint strengthening part is formed by adhering the granular material to the back surface of the bottom plate, (A) shows a cross-sectional view of the drainage sheet, and (B) is a part of the joint strengthening part. Is shown enlarged. FIG. 20 shows that the joint strengthening part is formed by biting ribs on the back surface of the bottom plate along the length direction of the drainage sheet, (A) shows a cross-sectional view in the lateral direction of the drainage sheet, and ( B) shows an enlarged part of the joint strengthening portion.

[First Embodiment]
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the drainage sheet of the present embodiment, and FIG. 2 is a cross-sectional view in the lateral direction of the drainage sheet of the present embodiment.
As shown in FIG. 1, the drainage sheet A of this embodiment includes two water guides 10 for guiding and draining water, and drainage sheets A provided at both ends of the water guide part 1 for attaching to a wall surface. It consists of two attachment parts 20.
The water guide section 10 includes a bottom plate 11 and a plurality of water guide ribs 12 that are vertically formed from the bottom plate 11.

A water conduit 14 through which water flows is formed between the pair of water guide ribs 12, and the water is guided and guided in the length direction by the water guide ribs 12.
The height of the water guide ribs 12 and the distance between the water guide ribs 12 are not particularly limited, and may be necessary depending on the amount of spring water per unit time in the actual work site, the environment around the spring location, etc. It is preferable to select an appropriate one.

For example, in the case of the drainage sheet A of the present embodiment, the height of the water guide ribs 12 is 5 to 15 mm, and the distance between the water guide ribs 12 is 5 to 20 mm.
In addition, when raising the drainage capacity of the drainage sheet A, it is preferable to perform a water-repellent treatment on the bottom plate 11 and the water guide ribs 12.

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

Further, the manufactured drainage sheet A has a so-called waist due to the flexibility inherent in the synthetic resin and the provision of the water guide ribs 12. For example, when one end of the drainage sheet A is gripped, the other end is As a whole, it has a moderately curved shape.
Therefore, the attachment operation along the shape of the wall surface to be constructed (for example, the curvature surface shape of the tunnel wall surface) can be easily performed.

  Further, since the drainage sheet A is formed of a water-impermeable synthetic resin, the spring water does not ooze 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 state of drainage of the spring water flowing through the water guide section 10 can be visually recognized, and management of the drainage sheet A during or after construction is simplified.
Moreover, when the drainage sheet A is attached to a construction place where precipitation of free lime is likely to occur, the clogging of the water guide section 10 can be confirmed at a glance, so that efficient maintenance work and maintenance are possible.
From the above viewpoint, materials suitable for forming the water guide portion 10 and the attachment portion 20 are polypropylene, polyethylene, and the like.

As shown in FIG. 2, the attachment portion 20 is a plate-like member and is provided on both the left and right sides of the water guide 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.
It is preferable from the viewpoint of strength that part of the mounting portion 20 is thick.

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

A plurality of hook-shaped sealing ribs 21 (four in this case) are formed in the attachment portion 20 at intervals in the length direction of the drainage sheet A. Stands in the same direction as the ribs.
Since a plurality of the sealing ribs 21 are provided at intervals, it is possible to prevent the back-filling filler from entering the inside in multiple stages.
The sealing rib 21 is formed so that its thickness gradually decreases as it goes to the tip, and is flexible and easy to adapt along the wall surface.

The sealing rib 21 is more flexible than the water guiding rib that guides water, and can be elastically opposed to the surface of the sprayed concrete.
The attachment portion 20 is attached to the sprayed concrete surface K1 using a driving pin P or the like. At that time, the sealing rib 21 presses the concrete surface K1 in an elastic manner.

FIG. 4 shows a state in which the sealing rib 21 of FIG. 3 presses the sprayed concrete surface K1 in an elastic manner.
For this reason, there is no gap between the mounting part 20 and the shotcrete surface K1, so that the backfilling filler K2 enters the back side and enters the water guide part of the drainage sheet A. There is no.
It is preferable that the thickness of the two sealing ribs 21 on the inner side of the two sealing ribs 21 on both ends (both outer sides) is thinner.

FIG. 5 is an enlarged view of the attachment portion 20 in which the sealing ribs 21 having different thicknesses are formed.
When the wall thickness is thin, the flexibility increases and the flexibility increases. However, when the driving pin P is driven between the sealing ribs 21 on both ends, the bending of the sealing ribs 21 (two) on the inner side is large. Can be strongly pressed against the surface by the sealing ribs 21 at both ends.
By pressing the sealing ribs 21 (two pieces) on the inner side, the sealing ribs 21 on both ends strongly contact the sprayed concrete surface K1 and a spring effect is exhibited.
Further, the four sealing ribs 21 are preferably set so that the two sealing ribs 21 on the inner side are lower than the height of the sealing ribs 21 on the both ends (both outer sides) by a distance L. The spring effect is increased.

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

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

FIG. 8 is an enlarged cross-sectional view showing the attachment portion 20 on which the sealing rib 21 having the inclination is formed.
Since the sealing rib 21 has an inclination from the beginning, when the mounting portion 20 is pressed against the shotcrete surface K1, the direction of the inclination coincides with the outside, and the backfill filler can be reliably prevented from entering. To do.

FIG. 9 is an enlarged cross-sectional view showing a state where the sealing rib 21 shown in FIG. 8 is pressed against the sprayed concrete surface K1.
If hydraulic 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, the drainage sheet drives and fixes the driving pin P, but it is important that the driving pin P is driven accurately.

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

  In the drainage sheet A of the present invention, the bottom plate 11 and the attachment portion 20 are integrally formed, so that they are very firmly coupled and are not easily damaged.

On the wall surface to which the drainage sheet A of the present invention is attached, the spring water that springs out flows into the water conduit 14 defined by the water guide ribs 12 adjacent to both sides, and is drained downward through the water guide ribs 12.
That is, since the water that has entered the drainage sheet A flows straight along the individual water conduits so as to be guided by the water guide ribs, the water flow paths are arranged and collision between the water flows does not occur.
As a result, the water drainage capacity is greatly increased.

Next, an installation example of the drainage sheet will be described.
FIG. 11 is a block diagram showing an example of installation of the drainage sheet according to this embodiment.
The drainage sheet is attached in one process of the “new tunnel method”.

 Here, as described above, the new tunnel construction method is usually "split concrete construction" → "rock bolt construction" → "drainage sheet installation" → "waterproof sheet installation formwork" → "backfill filler injection" → Sequence is performed through the steps of “Removing the formwork” → “Placing the lining concrete”.

First, concrete is sprayed on the excavated surface after excavating the tunnel.
Then, a lock bolt (not shown) is driven into an appropriate place in order to maintain strength on the sprayed concrete surface K1 formed by spraying.
Next, the drainage sheet A is mounted on the surface of the shotcrete, and the portion of the mounting surface 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 attachment mold is installed, and the waterproof sheet B is supported in a curved shape (here, an arch shape) by the mold.
Next, a backfilling filler K2 (mainly mortar material or the like) is filled between the drainage sheet A and the waterproof sheet B.
Thereafter, the formwork is removed, and lining concrete K3 is further placed from above the waterproof sheet A.

FIG. 12 is a diagram showing a schematic cross section in 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 guide rib 12 may follow the inner periphery of the curved wall surface (for example, the sprayed concrete surface sprayed on the excavation 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 attached along the arch-shaped wall as described above, so that the spring water is guided in the direction of the arrow and flows down in the direction of the root of the tunnel wall.

  By the way, it is also possible to provide a multistage drainage structure by further providing a drainage sheet, a backfilling filler, a waterproof sheet, and a lining concrete layer on the lining concrete layer K3.

By forming the wall surface structure as described above on the excavation surface of the tunnel, the spring water that springs from the excavation surface can be efficiently discharged.
Moreover, when there is a possibility that the outflow of soil particles from the excavation surface, a drainage sheet A is attached after disposing a water-permeable filter material such as a nonwoven fabric on the excavation surface.
As a result, it is possible to eliminate as much as possible the possibility that the soil particles fall into the water guide section 10 and cause clogging.

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

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
FIG. 15 is a perspective view showing a drainage sheet of the second embodiment. Moreover, FIG. 16 is sectional drawing of the horizontal direction of the drainage sheet of this embodiment.
As shown in the figure, the drainage sheet A of the present embodiment is for guiding the water guide part 10 for guiding and draining water and the drainage sheet A provided at both ends (both sides) of the water guide part 10 to the wall surface. And two mounting portions 20.

The water guide section 10 includes the bottom plate 11 and a plurality of water guide ribs 12 erected vertically from the bottom plate 11 in the same manner as in the first embodiment described above. In the second embodiment, the mounting portion 20 is greatly different from that of the first embodiment.
In other words, the mounting portion 20 has no sealing rib 21 and is a hollow portion 20A having a rectangular cross section. The hollow portion 20A is deformed to exhibit elasticity.
The mounting portion 20 is fixed to the concrete surface by driving a driving pin or the like from above the hollow portion 20A. In this case, the hollow portion 20A strongly presses the concrete surface and exhibits an intrusion prevention function.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
The drainage sheet A of the present embodiment has a water guide part 10 for guiding and draining water, and two attachment parts 20 for attaching drainage sheets A provided at both ends (both sides) of the water guide part 10 to the wall surface. This 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 to enhance the bonding property with the backfilling filler K2.
In the first place, if the bottom plate 11 has poor bondability with the backfilling filler K2, a peeling phenomenon may occur between the two while receiving vibration or the like after construction.

In this construction method (see FIGS. 11 and 12), the outside of the bottom plate 11 is solidified by the backfilling filler K2, but after construction, a peeling phenomenon occurs between the two while receiving vibration or the like 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, a portion that strengthens the bondability with the backfilling filler K2, that is, a bonding strengthening portion 11A is formed on the back surface of the bottom plate 11.

FIG. 17 shows a structure in which the joint reinforcing portion 11A is made by adhering short fibers F to the back surface of the bottom plate 11, FIG. 17 (A) shows a cross-sectional view in the lateral direction of the drainage sheet, and FIG. 17 (B). Shows an enlarged view of a part of the bonding strengthening portion 11A.
In this case, the short fibers F are fixed to the back surface of the bottom plate 11 via the adhesive R.
The short fibers F may be fixed by spraying with the adhesive R applied to the back surface of the bottom plate 11.
With such a structure, the short fibers F are entangled and buried in the backfilling filler K2, and the bonding force between the backfilling filler K2 and the bottom plate 11 is strengthened.

FIG. 18 shows a structure in which the bonding reinforcing portion 11A is made by adhering the nonwoven fabric N to the back surface of the bottom plate 11, FIG. 18 (A) shows a cross-sectional view of the drainage sheet, and FIG. 18 (B) shows the bonding. A part of strengthening part 11A is expanded and shown.
In this case, the nonwoven fabric N is fixed to the back surface of the bottom plate 11 via the adhesive R.
18A is an enlarged view of the entire drainage sheet, and FIG. 18B is an enlarged view of a part of the joint strengthening portion 11A.
These short fibers F and nonwoven fabric N can be immediately fused and fixed to the back surface of the bottom plate 11 when the bottom plate 11 is extruded.

  The backfilling filler K2 penetrates into the yarns of the nonwoven fabric N and gets entangled and buried, and the bonding force between the backfilling filler K2 and the bottom plate 11 is strengthened.

FIG. 19 shows a structure in which the bonding reinforcing portion 11A is formed by adhering the granular material S 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 view of a part of the bonding strengthening portion 11A. In this case, the granular material S is sprayed in a state where the adhesive R is applied to the back surface of the bottom plate 11.
As another method, it is possible to spray and fix the granular material S on the back surface of the bottom plate 11 immediately after being extruded when the bottom plate 11 is extruded.
Due to the presence of the granular material S, the contact area with the backfilling filler K2 is increased, and the bondability between them is enhanced.
Here, as the granular material S, sand or the like is preferably employed.

FIG. 20 shows a structure in which the joint strengthening portion 11A is formed by biting ribs L along the length direction of the drainage sheet on the back surface of the bottom plate 11, and FIG. 20 (A) is a cross section in the lateral direction of the drainage sheet. FIG. 20B is an enlarged view of a part of the bonding reinforcing portion 11A.
Since the bottom plate 11 is extrusion-molded, it is possible to simultaneously extrude the biting rib L integrally formed by the design of the extrusion cap.
Since the biting ribs L are embedded in the backfilling filler K2, the bondability between the bottom plate 11 and the backfilling filler K2 is greatly improved.
Although the biting rib L has a bent portion at the tip in the drawing, it is not always necessary to have the bent portion, and it is sufficient that the anchoring effect can be exhibited.
In addition, by making the tip bend greatly sharp, it becomes a non-return rib and a more effective anchoring effect is obtained.

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

10 ... water guide part 11 ... bottom plate 11
11A ... Joint strengthening part 12 ... Water guide rib 14 ... Water guide channel 20 ... Mounting part 20A ... Hollow part 21 ... Sealing rib A ... Drain sheet B ... Waterproof sheet K1 ... shotcrete surface (spray concrete)
K2 ... Backfilling filler K3 ... Lining concrete P ... Driving pin G ... Fine groove N ... Non-woven fabric R ... Adhesive F ... Short fiber S ... Granule L ... Ribbing rib

Claims (12)

  A drainage sheet comprising a water guide portion for guiding and draining water, and an attachment portion for attaching the water guide portion to a wall surface, wherein the water guide portion and the attachment portion are formed of an impermeable synthetic resin. A drainage sheet characterized by having a water intrusion prevention function at the mounting portion.   The water guide portion includes a bottom plate and a plurality of water guide ribs formed upright from the bottom plate, and a plurality of sealing ribs having a water intrusion preventing function are formed in the attachment portion. Item 1. A drainage sheet according to Item 1.   The drainage sheet according to claim 2, wherein the sealing rib is thinner on the inner side than both ends.   The drainage sheet according to claim 2, wherein the sealing rib has a lower height when it is inside the both ends.   The drainage sheet according to claim 2, wherein the sealing rib is inclined outward.   The drainage sheet according to claim 1, wherein a hollow portion having a water intrusion preventing function is formed in the attachment portion.   The drainage sheet according to claim 1, wherein the bottom plate is made of a semitransparent or transparent synthetic resin.   The drainage sheet according to claim 1, wherein a joining strengthening portion for strengthening the joining property with the backfill filler is formed on the back surface of the bottom plate.   The drainage sheet according to claim 1, wherein the joint strengthening part is obtained by bonding or fusing a short fiber or a nonwoven fabric to the back surface of the bottom plate.   The drainage sheet according to claim 1, wherein the joint reinforcing portion is formed by adhering or fusing a granular material to the back surface of the bottom plate.   The drainage sheet according to claim 1, wherein the joint reinforcing portion is formed by biting a rib on the back surface of the bottom plate.   The wall surface structure characterized by attaching so that the front-end | tip of the water guide rib of the drainage sheet as described in any one of Claims 1-11 may contact | abut along a curved-shaped wall surface.

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