JP2009052256A - Sheet for civil engineering work - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet for civil engineering work, which reinforces soft ground by being laid on a surface of the soft ground beforehand to prevent heavy equipment from sinking in the soft ground, ensures the trafficability of the heavy equipment, achieves bank reinforcement when banking is executed after laying the sheet on the soft ground, guarantees safety of living organisms because of using of polylactic acid fibers as the warp and the weft of the sheet, is advantageously presumed to be decomposed in three to five years in the normal natural environment such as in the ground or in water, high in strength retention compared with polyester fibers, small in deterioration by sunlight, and high in weatherability. <P>SOLUTION: The sheet is formed of a cloth C which is woven by interlacing a number of pieces of warp T and weft Y each other. The warp and the weft are made of the polylactic fibers, and textile weave that is a manner of weaving and interlacing the warp and the weft each other, is implemented by a pseudo-gauze fabric. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention mainly relates to a civil engineering sheet used when performing civil engineering work such as land reclamation work for soft ground.

  Conventionally, as this kind of civil engineering sheet, a sheet having a structure composed of a woven or knitted fabric of synthetic fibers such as polyester fibers or polyamide fibers, a nonwoven fabric, or a molded sheet formed of a synthetic resin such as polyethylene is known.

The civil engineering sheet was laid in advance on the surface of the soft ground, and the soft ground was reinforced to prevent the heavy machinery from sinking into the soft ground, ensuring heavy machinery trafficiness, or laying on the soft ground. The embankment will be reinforced when the embankment is constructed later.
JP-A-5-163656

  However, in the case of these conventional structures, disposal after completion of construction may become a problem, remain in the soil without being decomposed, hinder the growth of plant roots such as flowering trees, and hinder the construction of buildings. It has the disadvantage of being.

  The present invention aims to solve these disadvantages. Among the present inventions, the invention according to claim 1 is a woven fabric obtained by interweaving a large number of warps and a large number of wefts. In the civil engineering sheet, polylactic acid fibers are used as the types of the warp and the weft, and the woven structure that is a crossing of the warp and the weft is a pseudo-weave.

As described above, according to the present invention, the civil engineering sheet is preliminarily laid on the surface of the soft ground to reinforce the soft ground and prevent sinking of the heavy machinery into the soft ground. It is possible to secure heavy traffic and to reinforce the embankment when laying on soft ground and then embedding it. At this time, polylactic acid fibers are used as the types of warp and weft. Because it is used, it is expected that it will be safe against living organisms and will be decomposed in about 3 to 5 years in a natural environment in ordinary soil or water, and its strength retention is higher than that of polyester fiber. Even if recovered after use and incinerated, no toxic gas such as dioxin, hydrogen chloride, NO _x is generated, weathering is reduced with little deterioration due to sunlight, and How Since a certain fabric structure is a pseudo-woven weave, it is possible to maintain the tensile strength over time, increase the air permeability and water permeability due to the large mesh opening, and promote drainage by compaction of soft ground, The misalignment is less likely to occur, and is not limited to embankment reinforcement, and can also be used as a slope revegetation sheet for embankment slopes. And although it is contrary to the property of biodegradability, it can also be used as a herbicidal sheet by being excellent in the weather resistance by an ultraviolet-ray.

  1 and 2 show an embodiment of the present invention. Reference numeral 1 denotes a civil engineering sheet, which is composed of a fabric C formed by weaving a large number of warps T and a large number of wefts Y.

  In this case, polylactic acid fibers are used as the types of the warp T and the weft Y, and the fabric structure that is a crossing of the warp T and the weft Y is a pseudo-weave.

  Here, the polylactic acid fiber refers to a plant obtained by fermenting starch contained in a plant such as corn to produce lactic acid, polymerizing the lactic acid, and fiberizing the polylactic acid thus obtained. Synthetic fiber. For example, polylactic acid fiber “Ecodia (registered trademark)” manufactured by Toray Industries, Inc. can be used.

  In addition, the above-mentioned pseudo-weave is a woven structure that is a tangled structure that twists the weft warp to the left and right of the ground warp for each weft. First, a weft and warp yarn is a structure in which 3 to 5 yarns are bundled and arranged in parallel so that more gaps are secured between the bundles and the mesh is tailored.

  For example, as shown in FIG. 1, the complete structure is formed by bundling three warps Y and warp YT in parallel by binding three warps T and three wefts without causing the warps T to fold. And a woven fabric structure in which the complete structure is continuous as shown in FIG.

  Also, in this case, as a manufacturing process, first, in the twisting process, twisting is applied to the original yarn made of polylactic acid fiber (the false twisting process is omitted when the thread is thick. Next, in the warping process, in order to use the yarn that has undergone the twisting process as a warp in the loom, it is wound around the beam with the same length and number (usually for smooth weaving, Glue the yarn, but it is better not to glue it in consideration of adverse environmental effects such as washing of the glue.) After this preparatory work, in the weaving process, the warp and weft yarns are mixed to simulate Weaving is performed in the weaving, and then, in the refining process, the tension of the weaving yarn is released to a natural state by immersing in hot water, and the crystal structure of the fiber molecule is stabilized to increase the strength. In the process Increase the strength of the fiber with hot air, and then, if necessary, dye the fabric weaved in green or black in the dyeing process, and then pull the cloth while performing heat treatment in the organizing process to adjust it to the specified width. It is manufactured by.

Since this embodiment is configured as described above, the civil engineering sheet 1 is preliminarily laid on the surface of the soft ground to reinforce the soft ground and prevent the heavy machinery from sinking into the soft ground. It is possible to secure trafficability and to reinforce the embankment when laying on soft ground and then performing embankment construction. At this time, polylactic acid fiber is used as the type of warp and weft It is expected to decompose in about 3 to 5 years in a natural environment in normal soil or water, and the strength retention is higher than that of polyester fiber. even when incinerated, dioxins, hydrogen chloride, not toxic gas causes generation of NO _X, and less degradation due to sunlight can increase the weather resistance, and a manner of crossing of the warp and weft fabric Since the weaving is pseudo-weaving, the tensile strength can be maintained over time, and the large opening can increase the air permeability and water permeability, promote drainage by compaction of soft ground, In addition, it is not limited to embankment reinforcement, it can also be used as a slope revegetation sheet for embankment slopes, exhibits the effect of fixing the seed slope and is decomposed after the plant has grown sufficiently, Although it is contrary to the biodegradable nature, it can also be used as a herbicidal sheet due to its excellent weather resistance by ultraviolet rays.

[Example 1]
Both warp and weft are 1120 dtex / 192 fil, and weaved with pseudo-weave with a warp density of 34 / 本 and a weft density of 32 / 吋. Used as a single thread).

[Example 2]
Both the warp and the weft are 1450 dtex / 180 fil, and the weft density is 30 / 吋, and the weft density is 27 / 吋. The book is twisted and used.)

[Example 3]
Both warps and wefts were twisted using 1120 dtex / 192 fil yarns, and this warp density was 34 / 吋 and the weft density was 32 / に て. And four twists are used as one thread.) The performance evaluation of these examples is shown in Table 1 below.

  In addition, this invention is not restricted to the said Example, The thickness of a raw yarn, a number, etc. are changed and designed suitably.

  As described above, the intended purpose can be sufficiently achieved.

It is a complete organization chart of the example of the present invention. It is a textile organization chart of the Example of this invention.

Explanation of symbols

T Warp Y Weft C Weaving 1 Civil engineering sheet

Claims (1)

It consists of a woven fabric made by weaving a large number of warps and a large number of wefts. Polylactic acid fibers are used as the types of the warps and wefts. Civil engineering sheet characterized by being.

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