JP5258692B2 - Ground protection sheet - Google Patents

Description

  The present invention relates to a surface protection sheet that is laid on a slope surface or the ground and prevents rainwater from penetrating into the ground surface and weed growth.

  Various slope protection works have been constructed to protect the beauty of the railroad tracks and river slopes from damage caused by rainwater penetration and the suppression of weed growth. For this type of slope protection work, it is processed with a tension turf that finishes the slope and then turf is applied, a spray mortar that sprays cement mortar and asphalt mortar on the slope with a compressor, or a thermoplastic resin. A construction method for laying a sheet on a slope is known.

  Patent Document 1 discloses a protective sheet for a slope surface provided with a protective layer formed from a soft polyvinyl chloride resin, an intermediate water-impervious layer, and a weed growth prevention layer composed of a fiber fabric. Since the protective layer of this protective sheet is excellent in bacteria resistance, the protective sheet is sufficiently prevented from deteriorating, and it is possible to prevent weed growth over a long period of time.

JP-A-8-291523

  However, in the protective sheet described in Patent Document 1, since the protective layer and the intermediate water shielding layer are formed of a soft polyvinyl chloride resin, when the protective sheet comes into contact with a sharp protrusion during laying. There was a risk of damage.

  The present invention has been made to solve the above problems, and an object thereof is to provide a surface protection sheet having excellent strength characteristics.

  In order to achieve the above-mentioned object, the present invention provides a first impermeable barrier comprising an olefin-based thermoplastic rubber, which is laid on the ground surface and is grounded to the ground surface in a surface protective sheet for preventing rainwater penetration and weed growth. A second sheet made of an olefin-based thermoplastic rubber, laminated on the grass sheet, the first water-impervious grass-proof sheet, a dimension stabilizing cloth for suppressing expansion and contraction of the surface protective sheet, and laminated on the dimension stabilizing cloth. It is characterized by comprising a water-impervious grass-proof sheet and an artificial turf base fabric laminated on the second water-impervious grass-proof sheet and having an artificial turf pile planted on the surface thereof.

  At this time, the olefin thermoplastic rubber is preferably FPA.

  The dimensionally stable cloth is preferably a woven cloth having a porosity of 15% or more.

  It is preferable that the dimension stabilizing cloth is integrated by fusing the surface between the first water-proof and grass-proof sheet and the second water-proof and grass-proof sheet.

  It is preferable that the thickness of the first water-impervious weedproof sheet and the thickness of the second water-impervious weedproof sheet are substantially the same.

  The dimension stabilizing fabric is preferably made of polyester.

  According to the present invention, a surface protection sheet excellent in strength and the like can be provided.

Sectional drawing which showed the surface protection sheet which concerns on embodiment of this invention. A graph summarizing the measurement results of peel strength between a polyester woven fabric having three types of porosity and styrene-butadiene rubber. The figure which showed the classification | category of the water shielding sheet. The usage example of the surface protection sheet which concerns on embodiment of this invention. The usage example of the surface protection sheet which concerns on embodiment of this invention. Sectional drawing which showed the junction part of the surface protection sheet. Sectional drawing which showed the surface protection sheet which concerns on other embodiment of this invention. Sectional drawing which showed the surface protection sheet which concerns on other embodiment of this invention.

  Hereinafter, a surface protection sheet according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a surface protection sheet according to an embodiment of the present invention. The surface protection sheet 1 has a ground contact surface 10 a that contacts the ground surface, and is laminated on the first water-impervious sheet 10 and the first water-impervious weed-proof sheet 10 to prevent the infiltration of rainwater and the growth of weeds. A dimension-stabilizing cloth 11 that stabilizes the dimensions of the surface protection sheet 1, and a second water-impervious weed-proof sheet 12 that is laminated on the dimension-stabilizing cloth 11 and formed of the same material as the first water-impervious weed-proof sheet 10. The artificial turf base cloth 13 laminated on the second water-impervious grass prevention sheet 12 and the artificial turf pile 14 which is planted on the artificial turf base cloth 13 and forms the surface layer of the ground protection sheet 1 are configured.

  The artificial turf pile 14 is planted on the artificial turf base cloth 13 and forms a surface layer of a water-proof and grass-proof sheet when installed on a revetment or the like. The artificial turf pile 14 is formed of nylon such as nylon 6 or nylon 66, so that the artificial turf pile 14 having excellent corrosion resistance and flame retardancy is formed as described later.

  The artificial turf base fabric 13 is a fabric in which warp yarns and weft yarns made of, for example, polypropylene are combined. The artificial turf base fabric 13 is fused to the second water-impervious grass prevention sheet 12 to prevent the artificial turf pile 14 that has been planted from falling off.

  The second water-impervious weed-proof sheet 12 is made of a material excellent in stab resistance in order to prevent the penetration of rainwater and the like and to prevent the growth of weeds. Examples of such a material include Flexible Polymer Alloy (hereinafter referred to as FPA) which is an olefin-based thermoplastic rubber. FPA not only has excellent stab resistance, which is an index of water-blocking and herbicidal effects, but also has excellent physical properties such as durability. Further, FPA has a wide temperature range in which heat fusion can be performed. Therefore, the second water-impervious weedproof sheet 12 made of FPA is heated to about 220 ° C., and the heated second water-impervious weedproof sheet 12 and the cloth such as the artificial turf base cloth 13 are pressed with a roller. The second water-proof and grass-proof sheet 12 bites into the texture of the artificial turf base cloth 13 and the like, and both are firmly bonded.

  Moreover, the thickness of the 2nd water-impervious grass prevention sheet 12 is set to about 0.8 mm, for example. A part of the surface protection sheet 1 is constituted by the second water-impervious weed-proof sheet 12 and the first water-impervious weed-proof sheet 10 set to the same material and dimensions as the second water-impervious weed-proof sheet 12. Thus, the surface protection sheet 1 has a predetermined mass. Thereby, the danger that the laid water-proofing and weeding sheet will be blown by the wind is reduced, and the water-proofing and weeding sheet can be stably laid on the ground surface.

  The dimension stabilizing cloth 11 is, for example, a general-purpose fiber, and is fused with a first water-proof and grass-proof sheet 10 and a second water-proof and grass-proof sheet 12 (hereinafter, collectively referred to as a water-proof and grass-proof sheet). A fiber that can withstand the temperature of 220 ° C. of the water-proof and grass-proof sheet is preferable when wearing. As such a fiber, the dimension stabilizing cloth 11 is formed of a woven cloth made of polyester, for example. Further, the polyester woven fabric used for the dimension stabilizing cloth 11 has a porosity (a value obtained by dividing the total area of the gaps formed by the warp and weft per unit area of the dimension stabilizing cloth 11 by the unit area) of 15%. The above is used. By forming the dimension stabilizing cloth 11 from a polyester woven cloth having a porosity of 15% or more, the dimension stabilizing cloth 11 is firmly fused between the water-proof and grass-proof sheets.

  As described above, when the dimension stabilizing cloth 11 is firmly fused between the water-impervious weed sheet, the water-impervious weed sheet is constrained by the dimension stabilizing cloth. That is, the expansion and contraction that occurs when the water-impervious grass sheet is subjected to force or heat is suppressed by the dimension stabilizing cloth 11. Therefore, although the surface protection sheet 1 is composed of an FPA water-proof and grass-proof sheet that tends to stretch and contract, the plane dimensions thereof do not change greatly. Thereby, the expansion and contraction of the water-impervious grass protection sheet 1 is suppressed during the production of the surface protection sheet 1, and the surface protection sheet 1 can be easily manufactured to a desired size. In addition, even when the surface protection sheet 1 is laid, even if a temperature rise due to direct sunlight or inevitable force acts on the surface protection sheet 1, the surface protection sheet 1 can be constructed with high accuracy and workability is improved. It will be excellent.

  The 1st water-impervious weedproof sheet 10 is comprised from the sheet | seat made from FPA set to the dimension similar to the 2nd water-impervious weedproof sheet 12 mentioned above. The first water-impervious weed-proof sheet 10 has a ground contact surface 10a that is grounded when the ground protective sheet 1 is laid on the ground surface.

  Next, the grounds for determining the material, dimensions, etc. of each member constituting the above-described surface protection sheet 1 will be described.

  The artificial turf pile 14 is required to have functions such as adaptability to the urban environment (aesthetics) and weather resistance. The functions required for determining the material of the artificial turf pile 14 are as follows: 1. Excellent chemical resistance (acids, alkalis, fats, organic solvents, etc.) 2. Excellent bacterial resistance. 3. The coloring is clear and difficult to fade. 4. Excellent elastic recovery rate 5. Excellent flame retardancy, 6. Excellent weather resistance. 7. Excellent wear resistance; It is excellent in economic efficiency. In addition, there are two types of artificial turf piles 14 that are currently produced and that can be manufactured at low cost: nylon (trade name) (polyamide resin, hereinafter simply referred to as nylon) and polypropylene. Therefore, nylon and polypropylene are compared for the functions described above, and the results are summarized in Table 1. Table 2 summarizes the results of weather resistance tests on nylon and polypropylene materials. Nylon materials conform to JIS L 1013, and polypropylene materials conform to JIS L 1096. Carried out. As shown in Table 1, since there are many points where nylon is excellent in other functions excluding economic efficiency, the artificial turf pile 14 is made of nylon.

[Table 1]

[Table 2]

(References)
1) Textile Company (2006): Future Textiles -Evolving Technical Textiles-
2) Japan Chemical Fiber Association: General fiber performance table 3) Construction price survey committee: Construction price December 2008 issue

  As the artificial turf base fabric 13, a woven fabric made of polyester of dark green color has been generally used. However, the application of a woven fabric made of polypropylene was also examined for the purpose of reducing the manufacturing cost. As a specific examination method, a sample obtained by fusing a sheet made of FPA and a woven fabric made of polypropylene, which is a material of the water-impervious grass prevention sheet, and a FPA sheet and a woven fabric made of polyester are fused. For each of the samples, a peel strength (adhesion) test and a fouling test were performed. These tests are conducted in accordance with JIS K 6328, 6404-5, and 6404-6. As shown in Table 3, in both the peel strength test and the scissor test, good results were obtained with a sample in which an FPA sheet and a polypropylene woven fabric were fused. Therefore, a woven fabric made of polypropylene is used for the artificial turf base fabric 13.

[Table 3]

  As described above, the dimension stabilizing cloth 11 constrains the expansion and contraction of the water shielding / weeding sheet by fusing with the water shielding / weeding sheet, and stabilizes the planar dimension of the surface protection sheet 1. In order for the dimension stabilizing cloth 11 to have such a dimension stabilizing function and to increase the strength of the surface protection sheet 1, the adhesive strength between the dimension stabilizing cloth 11 and the water-impervious grass protection sheet is an important factor. This adhesive strength is considered to be enhanced by the water-impervious weed-proof sheet biting into the mesh of the dimensionally stable cloth 11 when the two are fused. Therefore, as shown below, a peel strength test was performed using three types of void-size dimension stabilizing cloths 11.

  The peel strength test of the dimension stabilizing cloth 11 uses a sample obtained by fusing a woven cloth made of polyester, which is a material of the dimension stabilizing cloth 11, and a styrene-butadiene rubber that looks like a water-proof and grass-proof sheet, and uses JIS K 6328. , 6404-5, and 6404-6. The fused polyester woven fabrics are set to different porosity of 14.1%, 25.0%, and 36.0%. The test results are shown in Table 4 and FIG. As shown in Table 4, the peel strength of the rubber covering cloth for covering 10 N / 5 cm (2 N / cm) and the peel strength of the airtight rubber cloth specified in JIS K 6328 for all samples. A result satisfying 15 N / 5 cm (3 N / cm) was obtained. FIG. 2 is a graph in which the horizontal axis represents the porosity of the dimensionally stable cloth 11 and the vertical axis represents the average value of the peel strength at each porosity. In order to set the peel strength between the dimension stabilizing cloth 11 and the water-impervious grass protection sheet to 15 N / 5 cm or more, the void ratio of the dimension stabilizing cloth 11 is set to 15% or more according to FIG. did.

[Table 4]

  The water-proof and grass-proof sheet is made of a synthetic synthetic resin based low-elasticity vinyl chloride resin with a grass-proof cloth laminated, but for the purpose of increasing the strength of the water-proof and grass-proof sheet. A new material to replace vinyl chloride resin was studied.

  The general classification of the water shielding sheet is shown in FIG. The water-impervious grass sheet is preferably made of a flexible material in consideration of winding and laying of the surface protective sheet 1 and a material having a high tearing performance in order to maintain water shielding. As a material satisfying such a function, the material of the water-proof and grass-proof sheet was selected from the so-called synthetic rubber / synthetic resin type medium elastic type shown in FIG. Furthermore, functions such as durability, stab resistance, thermal stability, and workability are required for the water-proof and grass-proof sheet. As the optimum material satisfying these functions, polypropylene-based FPA, which is an olefin-based thermoplastic rubber, was selected as the material for the water-proof and grass-proof sheet as described above.

  FPA has a smaller expansion / contraction due to temperature change than other water-impervious sheets. Therefore, it is convenient to stabilize the dimensions of the above-mentioned surface protection sheet 1. In addition, FPA has excellent puncture resistance, and is a material that can follow up to a height of 10 cm or more when the FPA is struck using a triangular pyramid. By using FPA having such a function as the material of the water-impervious grass protection sheet, the surface protection sheet 1 has excellent strength characteristics.

  By having the above-described configuration of the surface protection sheet 1, the following effects can be obtained.

  Even when the ground protection sheet 1 is formed from FPA, the first water shielding sheet 10 and the second water shielding sheet 12 constituting the surface protection sheet 1 are contacted with sharp projections when the surface protection sheet 1 is laid. The surface protection sheet 1 that is less likely to be damaged can be realized. Moreover, since the expansion and contraction due to the temperature change is smaller than that of the conventional water-proof and grass-proof sheet, a water-proof and grass-proof sheet having a design dimension can be easily manufactured. In addition, the surface protection sheet 1 can be constructed with high accuracy at the site, and the workability is also excellent. Furthermore, since durability and tearing performance are also excellent, the surface protection sheet 1 having a high water shielding effect and grass prevention effect can be realized.

  In addition, the first water shielding sheet 10 and the second water shielding sheet 12 are fused to the dimension stabilizing cloth 11 and the artificial turf base cloth 13, so that the surface protection sheet 1 can be used without using an adhesive. A laminated structure can be formed. Therefore, the aged deterioration of an adhesion part can be delayed and the surface protection sheet | seat 1 excellent in durability can be implement | achieved.

  Further, by forming the dimension stabilizing cloth 11 between the first water-proof and grass-proof sheet 10 and the second water-proof and grass-proof sheet 12, the dimensional stability of the surface protection sheet 1 can be improved, and the workability is improved. And the surface protection sheet | seat 1 excellent in workability is realizable. Moreover, it becomes possible to fuse | fuse the water-impervious grass prevention sheet and the dimension stabilization cloth 11 firmly by making the porosity of the dimension stabilization cloth 11 into 15% or more. Therefore, it is possible to further improve the dimensional stability of the surface weedproof sheet and to add a weedproof function to the dimensionally stable cloth 11.

  Furthermore, the dimension stabilizing cloth 11 is disposed approximately in the middle of the thickness of the surface protection sheet 1 by making the thickness of the first water shielding sheet 10 and the thickness of the second water shielding sheet 12 equal. Can do. For this reason, when the ground protection sheet 1 is bent, the dimension stabilizing cloth 11 is not so hindered, so that it is easy to handle the ground protection sheet 1 during winding or laying.

  Next, the usage example of the surface protection sheet 1 according to the embodiment of the present invention will be described. FIG. 4 is a cross-sectional view showing a situation where the surface protection sheet 1 is laid on the slope of the embankment 20 on which the railway road plate 21 is laid. Thus, by laying the surface protection sheet 1 on the slope surface, weeds growing on the slope surface can be prevented, and maintenance of the embankment 20 is facilitated. In addition, it is possible to reduce the speed at which the slope is weathered and to prevent erosion of the slope due to the water flow of rainfall.

  FIG. 5 shows a situation where the surface protection sheet 1 is laid on the slope of the bank 23 of the river 23. Even in such a case, the operations and effects as described above can be achieved, and maintenance management of the dike 22 is facilitated. In addition, the surface protection sheet 1 can be used in various places. For example, by laying on a slope along a road, a rooftop of a building, a veranda, a garden, etc., it is possible to protect the laying place or prevent the growth of weeds. Can be planned.

  In general, since the area for laying the surface protection sheet 1 is large, it is necessary to connect a plurality of surface protection sheets 1 during construction. In such a case, as shown in FIG. 6, a plurality of surface protection sheets 1 may be wrapped and joined. At this time, the surface protection sheet 1 can be joined by setting the wrap length L to about 100 mm and fusing adjacent surface protection sheets 1 at the site.

The present invention is not limited to the above-described embodiments, and various modifications and applications are possible.
FIG. 7 shows a surface protection sheet in which the first water-proof and grass-proof sheet 10 and the second water-proof and grass-proof sheet 12 are passed through the mesh of the dimension stabilizing cloth 11 and integrated with each other at the time of heat fusion. FIG. Thereby, it can be set as the laminated structure which integrated the surface protection sheet | seat 1 more firmly.

  FIG. 8 is a cross-sectional view of the surface protection sheet 1 formed from one water-proof and grass-proof sheet 15 without using the dimension stabilizing cloth 11 used in the above-described embodiment. The thickness of the single water-impervious weed-proof sheet 15 is set to the total thickness of the first water-impervious weed-proof sheet 10 and the second water-impervious weed-proof sheet 12 described above, so that the unit of the surface protective sheet 1 is obtained. The weight per area is not significantly different from the surface protection sheet of the above-described embodiment. Therefore, it becomes possible to lay the surface protection sheet 1 stably.

  Moreover, in the above-mentioned embodiment, although the dimension stabilization cloth 11 which consists of a polyester woven fabric was laminated | stacked between the water-impervious grass prevention sheet | seats, the material which has various functions according to the condition of the laying point of the surface protection sheet | seat 1 is used. May be. For example, when used in a place where the corrosive environment is severe, the durability of the surface protection sheet 1 may be improved by arranging a material having high durability against climate, bacteria, etc. between the water shielding sheets. .

DESCRIPTION OF SYMBOLS 1 Ground surface protection sheet 10 1st water-proof grass-proof sheet 10a Ground surface 11 Dimensional stabilization cloth 12 2nd water-proof grass-proof sheet 13 Artificial grass base fabric 14 Artificial grass pile 20 Filling 21 Railroad board 22 Embankment 23 River
L wrap length

Claims (6)

In the surface protection sheet that is laid on the surface and prevents the penetration of rainwater and the growth of weeds,
A first water shielding sheet made of olefin-based thermoplastic rubber that is grounded to the ground surface; a dimension stabilizing cloth that is laminated on the first water shielding sheet, and suppresses expansion and contraction of the surface protective sheet; A second water-impervious weed-proof sheet made of olefin-based thermoplastic rubber, laminated on the dimension-stabilized cloth, and an artificial turf base cloth laminated on the second water-impervious weed-proof sheet and planted with artificial turf piles on the surface A surface protection sheet characterized by comprising:   The surface protective sheet according to claim 1, wherein the olefinic thermoplastic rubber is FPA.   The surface protection sheet according to claim 1 or 2, wherein the dimensionally stable cloth is a woven cloth having a porosity of 15% or more.   The surface of the dimension stabilizing cloth is fused between the first water-proof and grass-proof sheet and the second water-proof and grass-proof sheet. The surface protection sheet according to item 1.   The surface protection sheet according to any one of claims 1 to 4, wherein a thickness of the first water-impervious weedproof sheet and a thickness of the second water-impervious weedproof sheet are substantially the same. .   The surface protection sheet according to any one of claims 1 to 5, wherein the dimensionally stable cloth is polyester.

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