JP4231073B2 - Impervious method using fiber reinforced impermeable sheet - Google Patents

Description

  The present invention relates to a water-impervious construction method using a fiber-reinforced water-impervious sheet in a water-impervious method such as a waste disposal site, and intends to prevent the fiber-reinforced water-impervious sheet from breaking due to stress.

  In recent years, pollution to the surroundings due to leakage of sewage at a waste disposal site is regarded as a problem, and water shielding is always performed on the waste disposal site.

  A waste disposal site usually digs a deep hole in the base and dumps the waste into the hole. Wastewater generated from waste penetrates into the ground and spreads around, contaminating the surrounding land and leading to environmental pollution. For this reason, water-proof sheets made of various materials such as rubber and resin are laid on the entire surface of the waste disposal site, and sewage generated from waste or dissolved in rainwater penetrates into the base. It is designed not to be stupid.

  When a rubber sheet is used as the water-impervious sheet, especially when laid on the slope of the disposal site, the sheet is inevitably extended to the lower side of the slope. If the sheet stretches and becomes loose enough, a large tension will be applied in the upper part, which will lead to breakage of the sheet.

  In order to improve such a situation, a rubber sheet in which a base fabric is embedded in a rubber sheet is used.

  Certainly, if a rubber sheet with improved impact strength by embedding a base fabric is used as a water-proof sheet, it will prevent the sheet from stretching even if it is used in areas where large stresses such as slopes are applied. Yes, but such sheets can hardly be expected to stretch and can be problematic.

  For example, if there is a depressed part on the base, if the weight of waste is applied to it, and the sheet does not contain a base fabric, the sheet can be stretched to absorb the depression of the sheet due to the depression. If the sheet itself is not expected to be stretched with the base fabric-containing sheet, the sheet may break at the depressed portion.

  If breakage occurs, there will be a problem of water leakage even if it is partially. Further, once a part breaks, especially if the part is subjected to stress such as a slope, a crack may further extend from the broken part, which may cause a large crack.

  Therefore, in the present invention, a fiber-reinforced water-impervious sheet that has sufficient strength that the sheet does not stretch even when stress is applied and that can absorb the depression of the base is used. The purpose is to provide a water-blocking method.

  According to claim 1 of the present invention, in a water-impervious construction method using a fiber-reinforced water-impervious sheet that lays a water-impervious sheet in a recess having a bottom surface and a slope, warp yarns in an elastomer are used as a water-impervious sheet laid at least on the slope. Has a strength of 20 kgf / cm or more, and the weft uses a water-impervious sheet embedded with a thread having a strength of 0.1 to 1.0 kgf / cm or less, along the slope of the slope where the weight of the water-impervious sheet is applied. The weft direction embedded in the water-impervious sheet is laid in the same direction, and is laid.

  By adopting such a configuration, the warp side of the staple has a strength of 20 kgf / cm or more and can maintain the strength. Therefore, the weight of the sheet of the water shielding sheet laid on the slope (slope) itself However, the sheet does not stretch even when stress in the direction along the slope is applied, but the weft yarn having a strength of 0.1 to 1.0 kgf / cm is cut to the partially depressed portion. By doing so, the sheet can stretch and sink along the depressed portion. Therefore, even if a weight is applied from above the sheet in the depressed portion, it can be absorbed by elongation in the weft direction. Originally, in order to achieve such an effect, wefts may be omitted. However, in order to improve processability in manufacturing, it is preferable that warp yarns are gathered together. Also, even when laid on slopes where a large amount of stress is applied, the warp side can sufficiently withstand the stress, and the weft can be easily cut, so there was unevenness such as a depression. However, the sheet does not break along the shape.

  FIG. 1 is a cross-sectional view of a fiber-reinforced water shielding sheet used in the present invention. The fiber-reinforced water-impervious sheet 1 used in the present invention is a sheet made of an elastomer 2 such as vulcanized rubber, and a sudder 3 is embedded in the elastomer 2.

  As a material used as the elastomer 2, a simple substance or a blended material such as chloroprene rubber (CR), butyl rubber (IIR), styrene butadiene rubber (SBR), ethylene propylene terpolymer (EPT) can be used, and particularly limited. Although it is not, using ethylene propylene terpolymer (EPT) or a blend of ethylene propylene terpolymer (EPT) and butyl rubber (IIR) is used as a water shielding sheet that is always exposed to the open air and exposed to sunlight. Is preferred.

  As shown in FIG. 2, the staple 3 is composed of a thick and strong warp 4 and a weft 5 which is thin and has a strength sufficient to align the warps. Examples of the material for the suddle 3 include synthetic fibers such as polyester fibers and polyamide fibers, and cotton.

  In the present invention, as a water shielding sheet, for example, when laid on a slope, stress is applied in the longitudinal direction of the slope due to the weight of the water shielding sheet, and the water shielding sheet 1 is provided so as to withstand the stress by the warp 4. Deploy. Since the warp 4 needs to have a strength sufficient to withstand such stress, a yarn having a strength of 20 kgf / cm or more is used.

  By adopting such a laying configuration, even when the bottom surface sinks, the weft can be cut in the weft direction of the sudder and the water shielding sheet can be extended, so that the settlement can be absorbed. If you use a water shielding sheet with a woven cloth that doesn't stretch at all, the water shielding sheet floats on the bottom of the sinking surface, and a large tension is applied and it breaks. It can also be.

  Further, the weft 5 is preferably as small as possible in terms of strength that can be easily cut when a slight force is applied so as not to break the sheet in consideration of the application to which the present invention is applied. However, when producing the sudder 3 or when embedding it in the elastomer to produce the water shielding sheet 1, even if it is cut without being easily cut, the warp 4 can be aligned and the production is affected. The yarn must have a strength that does not affect the width of 0.1 to 1.0 kgf / cm.

  If the strength of the warp 4 is less than 20 kgf / cm, the fiber-reinforced water-impervious sheet 1 will not be able to withstand the stress applied when laid on a slope such as a normal waste disposal site.

  When the strength of the weft 5 is less than 0.1 kgf / cm, it is easily cut during the production of the staple 3 or the fiber-reinforced water-impervious sheet 1, and the warp 4 can be held in an aligned state. If it exceeds 1.0 kgf / cm, it is difficult to follow the unevenness such as the recessed portion of the foundation after laying the fiber-reinforced water-impervious sheet 1, and in some cases, it may lead to breakage of the water-impervious sheet. Absent.

  By adopting the configuration as described above, the fiber-reinforced water-impervious sheet 1 can be obtained in which the warp 4 is aligned and aligned and embedded in the staple 3 and withstands the stress in the longitudinal direction sufficiently. Elongation can be prevented and physical properties such as impact resistance of the sheet can be improved. With respect to the stress in the lateral direction, the weft 5 can be easily cut as shown in FIG. 3 so that the water-impervious sheet 1 can be stretched, so that the stress is absorbed and breakage of the water-impervious sheet is prevented. Can do.

  Next, the procedure of the water shielding method will be described. FIG. 4 is a cross-sectional view of a waste disposal site to which the water-impervious construction method of the present invention is applied. A recess for dumping waste includes a bottom surface 10 and a slope 11.

  A water shielding sheet 12 made only of an elastomer such as vulcanized rubber is laid on the bottom surface 10 without a base fabric or sledding as supplementary teaching materials, and the sloping surface 11 shown in FIG. The fiber-reinforced water-impervious sheet 1 having 3 embedded therein is laid along the direction along the slope where the warp 4 is heavy.

  And the impermeable method of this invention is completed by joining the impermeable sheet 12 laid in the bottom face 10, and the impermeable sheet 1 laid in the slope 11. FIG.

  By adopting such a water-impervious construction method, even if the weight of the water-impervious sheet itself is applied to the water-impervious sheet 1 laid on the slope 11, the warp 4 prevents the stretch, and the slope 11 is partially depressed. Even if there is unevenness, the wefts 5 are cut, so that the interval between the warps 4 is opened, the portion of the elastomer 2 of the fiber-reinforced water-impervious sheet 1 is stretched, and the unevenness can be met. Therefore, it is possible to prevent the fiber-reinforced water-impervious sheet 1 from being broken.

In the water-impervious construction method of the present invention, it can be used for applications in which stress is applied only in one direction as described above. The present invention can be applied to portions other than the slope as long as stress is applied in only one direction.
Next, the results of comparative experiments using examples of the present invention and comparative examples will be described.

Example 1
As an example, in ethylene propylene terpolymer (EPT), the warp is a twisted yarn made of polyester, the strength is 30 kgf / cm, the weft is cotton, and the weight is 0.5 kgf / cm. The water-impervious sheet embedded with the used weave was laid on a slope with an inclination of 45 ° at a waste disposal site with a depth of 10 m.

  The slope is provided with a 50 cm diameter circular depression with a depth of 10 cm, and a fiber-reinforced water-impervious sheet is laid, and a spherical weight with a diameter of 10 cm is placed on the water-impervious sheet after 3 hours. The state of was observed.

  As a result, there was no broken part in the fiber-reinforced water-impervious sheet, and elongation occurred when the weft of the thread was cut, and the fiber-reinforced water-impervious sheet was sunk substantially along the shape of the weight.

(Comparative Example 1)
As Comparative Example 1, a water shielding sheet having the same specifications as those of the Examples except that a plain woven fabric was embedded in a rubber made of EPT using a warp and a weft made of polyester with a strength of 30 kgf / cm. The water shielding sheet was observed on the part laid on the slope and placed on the weight.

  As a result, the water-impervious sheet hardly stretched, and the weight floated with respect to the bottom of the depression. A part of the water shielding sheet was about to break.

(Comparative Example 2)
As Comparative Example 2, it is made of only EPT rubber and uses a water shielding sheet with the same specifications as the example except that nothing is embedded in it. Observed. As a result, in the part where the weight was placed, the water shielding sheet extended along the shape of the weight and was sinking into the depression, but the entire water shielding sheet also extended in an inclined direction, below the slope. Was slack.

  Therefore, in the present invention, since the warp is laid so that the warp is placed along the slope of the slope where the stress is applied due to the weight of the water shielding sheet, the water shielding sheet does not loosen, In addition, it is possible to sufficiently follow the unevenness such as the depressions existing on the slope by cutting the weft.

  The present invention can be used as a water shielding method for a waste disposal site or the like.

It is sectional drawing of a fiber reinforcement water-impervious sheet. It is a principal part perspective view of a suddle. It is sectional drawing which shows a mode that the stress of the horizontal direction was applied to the fiber reinforcement water-impervious sheet. It is sectional drawing of a waste disposal site.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fiber reinforced water shielding sheet 2 Elastomer 3 Sudare 4 Warp 5 Weft 10 Bottom 11 Slope

Claims (1)

  In a water-impervious construction method in which a water-impervious sheet is laid in a recess having a bottom surface and a slope, the warp has a strength of 20 kgf / cm or more in the elastomer as a water-impervious sheet laid at least on the slope, and the weft is 0.1 Using a water-impervious sheet embedded with a thread having a strength of ˜1.0 kgf / cm or less, laying the weft direction embedded in the water-impervious sheet in the direction along the slope of the slope where the weight of the water-impervious sheet is applied A water-impervious construction method using a fiber-reinforced water-impervious sheet.

Images