JPH10317411A - Flexible-multi-layer waterproof sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of a self-restorability against cutting or boring, by filling and holding powdery and granular water-swelling clay into a number of dents independently dispersed on the whole upper face laid on the rear sheet member and sticking a water-permeable front face sheet on the upper face of the rear sheet member. SOLUTION: Powdery and granular water-swelling clay 3 is filled and retained in a large number of recesses 1 independently dispersed on the whole upper face laid on a flexible and water-permeable rear sheet member 2 and a flexible and water-permeable front face sheet member 4 is stuck on the upper face of the rear sheet member 2 to enclose the clay 3 in the recessed 1. Accordingly, since the clay 3 is held in the state subdivided in the recessed 1 between the sheets members 4, 2, even if the waterproof sheet is cut off or holes are opened by separators, only clay of recesses at a cut part or an opened hole falls and hence, the outflow volume of clay can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible multilayer waterproof sheet, and more particularly, to a flexible multilayer waterproof sheet having a water-swellable powdery clay between layers.

[0002]

2. Description of the Related Art Conventionally, as a multilayer waterproof sheet having the above-mentioned structure, a powdery water-swellable clay is interposed between a pair of front and back flexible sheet materials in layers, and one sheet material layer and the other sheet are subjected to needle punching. A structure has been proposed in which the clay is held in layers between the sheet materials by joining the material layers (for example, see Japanese Patent Publication No. 7-81281).

[0003]

However, in the multilayer waterproof sheet having the above-mentioned conventional structure, the clay layer is held between the front and back sheet material layers by bonding by needle punching. Is connected, so it is possible to prevent the clay from falling from the surrounding area by ironing etc. applied to the surrounding area, but if it is cut or a hole is made, There was a problem that the clay flowed out of the perforated area without stopping and fell. By the way, at the construction site, there is a case where the waterproof sheet is cut and used when adding
In addition, as shown in FIG. 7, when applied to a retaining wall a, it is necessary to pierce a waterproof sheet through a separator (metal rod) b protruding from the retaining wall a, and a hole is often formed at this time.

In addition, the conventional structure requires a lot of trouble to join by needle punching and iron around the periphery.
There was also a problem that the manufacturing cost was high.

An object of the present invention is to eliminate the above-mentioned conventional problems.

[0006]

SUMMARY OF THE INVENTION The present invention provides a flexible and permeable backing sheet member having a plurality of recesses which are individually and individually dispersed over the entire upper surface, and a filling material is provided in each of the recesses. It is characterized by comprising a held powdery water-swellable clay, and a flexible and water-permeable front sheet member adhered to the upper surface side of the back sheet member so as to confine the clay in the recess. To a flexible multi-layer waterproof sheet.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the multilayer waterproof sheet of the present invention comprises a flexible and water-permeable back sheet member 2 having a large number of recesses 1 which are individually dispersed over the entire upper surface, and each of the recesses 1 And a powdery water-swellable clay 3 filled and held inside, and a flexible and water-permeable front sheet member adhered to the upper surface side of the back sheet member 2 to confine the clay 3 in the recess 1. 4 is provided.

The water-swellable clay 3 filled and held in the recess 1 is for forming a water-impermeable layer by self-healing property due to water swelling. The powder is used in a powdery state so as not to impair the flexibility of the powder.

The amount of water-swellable clay 3 per square meter may be within a range in which a water-impermeable layer can be formed due to self-healing properties. It is appropriately selected and determined in consideration of the above. The front and back sheet members 4 and 2 are not particularly limited as long as they have flexibility and water permeability. Usually, a cloth, for example, a woven fabric, a knitted fabric, or a nonwoven fabric is a combination of woven fabrics, a combination of knitted fabrics,
A combination of non-woven fabrics, and other woven fabrics, knits, and non-woven fabrics are used in appropriate combinations.

The fibers constituting the woven fabric, knitted fabric and non-woven fabric only need to be water-resistant. Usually, various plastic fibers, natural fibers, synthetic fibers and the like are used by mixing them as required.

The front and back sheet members 4 and 2 are for holding the clay 3 and have a thickness and strength that do not hinder the holding of the clay 3. ~ 1
It is appropriately selected from the range of about 0 mm in consideration of the material, strength and the like.

The recesses 1 formed by being dispersed over the entire upper surface of the back sheet member 2 are for filling and holding the granular water-swellable clay 3 in a divided state. It is better that the total opening area occupied in the space is as large as possible.
Since it is difficult to secure the strength of the clay 3 or to form the recess 1, the amount of the clay 3 per unit area is usually 30 to 90%, preferably 50 to 90%. It is appropriately selected and determined in consideration of the holding amount and the like.

The opening width of the recess 1 is preferably as small as possible within a range that does not hinder the filling and holding of the clay.
Usually, it is appropriately selected and determined from the range of 2 to 30 mm, preferably 3 to 10 mm.

The depth of the recess 1 may be appropriately selected depending on the amount of the clay 3 to be filled and held per unit area, and is usually within a range of about 1 to 30 mm. It is appropriately selected and determined in consideration of the above.

2 to 5 show several examples of the means for forming the recess 1. FIG.

FIG. 2 shows the back sheet member 2 by embossing.
This shows a case where the recess 1 is extruded toward the back surface side. In this case, a nonwoven fabric is suitable as the sheet member in consideration of workability.

FIG. 3 shows a case where a recess 1 is formed by pressing and deforming a part of the back sheet 2 by embossing. In this case, a thick nonwoven fabric is used as the back sheet 2 and the bottom of the recess 1 is formed. A thickness of about 0.5 to 3 mm remains under the compressed state.

FIG. 4 shows a case where the recess 1 is formed by laminating a mesh-like intermediate sheet member 5 on the upper surface of the back sheet 2.

The intermediate sheet member 5 needs to have flexibility and water permeability.
For example, a three-dimensional woven fabric having a mesh structure, a nonwoven fabric formed into a mesh by punching, or the like can be used.

FIG. 5 shows a finely divided three-dimensional knitted fabric (the back sheet member 2 is formed by making the front and back sides coarse and meshed, and connecting the ground structures 7 and 8 on the front and back sides by connecting yarns 6). Double Russell knitted fabric)
The upper surface side of FIG. 1 shows a case where a large number of recesses 1 partitioned by a mesh-like outer material structure 7 and connecting yarns 6 are formed.

Examples of the three-dimensional knitted fabric include a double Russell knitted fabric using fiber yarns and a woven fabric by a moquette loom.

Since the back sheet member 2 made of the three-dimensional knitted fabric has elasticity, the elastic sheet is used as the front sheet member 4 to provide an elastic waterproof sheet. Is obtained. Front and back sheet members 4, 2
Elongation of 10 to 150%, preferably 50 to 100%
A range of degrees is appropriate.

FIGS. 6 (a) and 6 (b) show a production example of the waterproof sheet of the present invention. As shown in FIG. 6 (a), powdery water-swellable clay 3 After filling, an adhesive (not shown) is applied to the partition 1a between the recesses 1 and the upper surface of the edge 1b, and thereafter, as shown in FIG. By bonding the front sheet member 4 to the upper surface side, the waterproof sheet of the present invention is obtained.
In addition, you may make it bond using a heat bonding nonwoven fabric etc. instead of an adhesive agent.

According to the waterproof sheet of the present invention, since the clay 3 is held between the front and back sheet members 4 and 2 in a state of being divided into the recesses 1..., The waterproof sheet is temporarily cut or the separator ( Even if a hole is drilled due to the hole (see FIG. 7), only the clay in the recessed portion 1 opening to the cut portion or the holed portion can spill the clay, and it is possible to minimize the flow amount of the clay. I can do it. By the way, if the amount of the clay flowed out is at this level, there is no possibility that the self-healing property due to the water swelling of the clay is substantially reduced.

[0025]

As described above, according to the present invention, it is possible to provide a high-quality, high-performance waterproof sheet which does not deteriorate in self-healing properties even when cut or perforated.

Further, as shown in FIG. 6, it can be manufactured by filling clay into the recess 1 on the upper surface of the back sheet member 2 and then bonding the front sheet member 4 onto the back sheet member 2.
It is much simpler and easier to manufacture than conventional methods that require needle punching and ironing, and lower manufacturing costs.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an example of a recess forming means.

FIG. 3 is a longitudinal sectional view showing an example of another forming means.

FIG. 4 is a longitudinal sectional view showing an example of still another forming means.

FIG. 5 is a longitudinal sectional view showing an example of still another forming means.

FIG. 6 is an explanatory view schematically showing a production example of the waterproof sheet of the present invention.

FIG. 7 is a diagram for explaining a problem that occurs when a waterproof sheet is applied to a mountain retaining wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concave part 2 Back sheet member 3 Water-swellable clay 4 Front sheet member 5 Mesh intermediate sheet member 6 Connecting thread 7 Outer fabric 8 Backing fabric

Continued on the front page (72) Inventor Katsuhisa Minami 1-416-1-E30-402 Tomigaoka, Nara City, Nara Prefecture (72) Inventor, Yoshio Yamada 4-9-1-11 Kagetsuki, Fukui City, Fukui Prefecture (72 Inventor Tsugio Tezuka 5-317 Yono, Oguchi-cho, Niwa-gun, Aichi Prefecture

Claims (6)

[Claims] 1. A flexible and water-permeable back sheet member having a plurality of recesses which are individually dispersed over the entire upper surface, and powdery water swelling filled in and held in each of the recesses. A flexible multi-layer waterproof sheet, comprising: an elastic clay; and a flexible and water-permeable front sheet member adhered to an upper surface of a back sheet member so as to confine the clay in the recess. 2. The recess has a total opening area of 30 to 90% of the entire back sheet member and a depth of 1 to 30 m.
The waterproof sheet according to claim 1, wherein the opening width is 2 to 30 mm. 3. The waterproof sheet according to claim 1, wherein the recess is formed by embossing a back sheet member. 4. The waterproof sheet according to claim 1, wherein the recess is formed by a flexible and water-permeable mesh-like intermediate sheet member laminated on the upper surface of the back sheet member. 5. A backsheet member having a stretchable three-dimensional structure in which a mesh-like outer fabric structure and a dense backing structure are connected by a connecting thread, wherein the backsheet member has a mesh-like outer fabric structure on an upper surface side. Equipped with a number of recesses separated by tissue and connecting yarn,
The concave portion is filled and held with a powdery water-swellable clay, and the upper end opening of the concave portion is closed by a flexible, water-permeable and stretchable front sheet member. Sheet. 6. The elongation percentage of the front and back sheet members is 10 to 150.
%.