JP2560082Y2 - Civil engineering sheet - Google Patents

Description

[Detailed description of the invention]

[0001]

Industrial Applicability The present invention relates to a sheet used for civil engineering applications such as earth and sand retaining, unequal settlement prevention of blocks, etc., and consolidation.
About

[0002]

2. Description of the Related Art Conventionally, synthetic resin fiber fabrics and synthetic resin fiber nonwoven fabrics have been widely used as sheets for civil engineering, for the purpose of reinforcing earth and sand, separating earth and sand from water, and the like. Synthetic resin fiber woven fabrics are woven and knitted using flat yarns, monofilaments, multifilaments, etc., which are stretched and oriented as films or filaments to impart high strength, to weft yarns. Reinforcement, capture,
In the case of pursuing dimensional stability, a method of increasing the woven density to increase the tensile and tear strength, etc. is adopted, but if the woven density is too high, the water permeability is inferior, and handling is inconvenient due to the increase in weight. It becomes something. On the other hand, synthetic resin fiber non-woven fabrics are manufactured by using a spun bond method, a needle punch method, a card method, and the like. At this time, a high basis weight is obtained by lamination or the like.

[0003]

[Problems to be Solved by the Invention] The present invention is intended to solve such problems, and has a large reinforcing effect on earth and sand, is excellent in catching earth and sand, and is suitable for civil engineering having high permeability and strength. No sheet will be provided.

[0004]

According to the present invention, a filter layer in which split yarns split into one of the warp yarns are densely implanted and monofilaments are coarsely implanted into the other weft yarns, and monofilaments are used as the warp yarns. Laminated and joined with a mesh-like reinforcing layer, tensile strength of 100kg / 3cm or more, water permeability
It is a sheet for civil engineering characterized by being at least 3.0 × 10 ^-2 cm / sec.

[0005] The civil engineering sheet of the present invention is a split gear.
A two-layer structure of a filter layer woven with a filament and a monofilament, and a mesh-like reinforcing layer of a monofilament,
Since the filter layer is mainly caused by the trapping property of soil and the like and the water permeability, and the mesh-like reinforcing layer is mainly caused by reinforcement of the soil and the like, the sheet has the desired effect. .

With respect to the filter layer, a woven fabric is used in which a split yarn is densely driven into one of the warp yarns and a monofilament is coarsely driven into the other and woven.

[0007] A split yarn is a method in which an amorphous film is formed from an extruder in the molten state of a synthetic resin by a T-die flat method or an inflation method and cooled to 10 to 20 mm.
In a flat yarn obtained by slitting to a width, stretching and stretching about 2 to 8 times in the longitudinal direction, and then heat-treating, a rotary blade roll in which a number of cutter blades are provided on the circumference and the cutting edge positions are arranged in a spiral shape. The flat yarn is cut at a high speed, and the flat yarn is cut and raised.

[0008] The split yarn is densely driven into one of the warp yarns, so that the woven fabric has a high water-permeability woven fabric which has a trapping property for earth and sand and the like, and which is formed into fine fibers to ensure a water passage. Therefore, a monofilament is roughly driven into the other of the warp yarns so as not to hinder high water permeability. That is, the dense driving means a state in which the yarns are adjacent to each other, and the coarse driving means a state in which the yarns are woven at appropriate intervals.

The mesh-like reinforcing layer is laminated and joined to the filter layer in order to further improve mechanical properties such as tensile strength and tear strength and to provide a sufficient effect for reinforcing earth and sand as a sheet for civil engineering. Therefore, in order to increase the strength without suppressing the water permeability as much as possible, a woven fabric in the form of a mesh having opening portions using monofilaments for the weft is used.

Here, the synthetic resin used for the split yarn or the monofilament is not particularly limited, but a thermoplastic synthetic resin corresponds to stable quality in continuous production and economical mass production. For example, polyolefins comprising homopolymers or mutual copolymers of α-olefins such as ethylene, propylene, 1-butene, 4-methyl-1-pentene or copolymers of these α-olefins and other comonomers Resins, polyester resins, polyamide resins, polyvinyl chloride resins, polyvinylidene chloride-vinyl copolymer resins, and the like.

In order to laminate and join the filter layer and the mesh-like reinforcing layer, they can be fixed by an adhesive, a heat seal, a hot melt web, powder fusion or the like. Even in this case, a partial joining method such as a dot-like, band-like, or lattice-like joining method is employed so that the joining portion does not cause a large decrease in water permeability.

The thus obtained civil engineering sheet of the present invention is required to have a tensile strength of at least 100 kg / 3 cm and a water permeability of at least 3.0 × 10 ^-2 cm / sec. If the tensile strength is less than 100 kg / 3 cm, the reinforcing effect of earth and sand decreases, and if the permeability is less than 3.0 × 10 ^-2 cm / sec., The effect of trapping earth and sand and the effect of separating soil and water are reduced. It cannot be suitable for civil engineering applications.

[0013]

The sheet for civil engineering of the present invention has a two-layer structure of a woven fabric using a high-strength drawn yarn, but has a high water permeability due to the split yarn that has been split and made into fine fibers. Gender,
It has the high strength, dimensional stability, etc. inherent to woven fabrics.

[0014]

[Embodiment] Hereinafter, an embodiment will be described.

[0015] Polypropylene (MI =
1.5), extruded at a melting temperature of 240 ° C by the inflation method, cooled and formed into a film, cut into tapes, stretched by a contact hot plate stretching method at a stretching temperature of 125 ° C and annealed. The yarn was drawn at a ring temperature of 135 ° C. and at a draw ratio of 4.8, and was brought into contact with a high-speed rotary blade roll to make a split yarn 4 having a fineness of 2,800 dr which was cut and raised.

The same polypropylene is selected, extruded from a nozzle at a melting temperature of 260 ° C., cooled, stretched by a water bath stretching method at a stretching ratio of 6.5 times, and heat treated to give a fineness of 650 dr.
Was manufactured.

The filter layer 2 was plain woven at a woven density of 6 × 10 yarns / inch using a monofilament 5 for the warp and a split yarn 4 for the weft. The weft split yarns 4 constituting the filter layer 2 are in a driven state without any spacing, while the warp monofilaments 5 have a spacing of 3 mm or more.

The mesh reinforcing layer 3 was obtained by plain weaving the above-mentioned 650dr monofilament 5 with both warps and weaving at a weaving density of 10 × 10 filaments / inch. The mesh-like reinforcing layer 3 has an opening of about 2 mm square by warp yarn.

In joining the filter layer 2 and the mesh-like reinforcing layer 3 thus obtained, a vinyl acetate hot melt melted by heating using an embossing roll having irregularities at intervals of 10 mm with respect to the filter layer 2. An adhesive was applied in a dot-like manner, a mesh-like reinforcing layer 3 was laminated on the adhesive, and was press-bonded by a heating roll and fixed at a partial joint portion 6 to obtain a civil engineering sheet 1 of this embodiment. . Table 1 summarizes the evaluation of this embodiment as a sheet for civil engineering use.

[0020]

[Table 1]

[0021]

[Effect of the Invention] The sheet for civil engineering of the present invention has a structure in which a woven fabric of drawn yarn made of synthetic resin with high strength is laminated, so that the reinforcing effect of earth and sand is large and the dimensional stability is good. Therefore, the workability is excellent. In addition, the split yarn made into fine fibers used for the filter layer, while being a woven fabric, imparts high water permeability to the sheet, and has excellent trapping properties for soil and the like and water permeability. It has a drainage function without sediment, and the sediment discharge is small and sediment and water can be separated. Further, since the sheet itself is relatively thick, it has high resistance to impact. Therefore, it is a civil engineering sheet which is extremely useful for civil engineering applications such as prevention of unequal settlement of slopes and protection of slopes, construction of drainage gutters, consolidation of floors, consolidation of floors, prevention of suction, and retaining of earth and sand.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view of a civil engineering sheet according to an embodiment.

FIG. 2 is a partially enlarged cross-sectional view of the civil engineering sheet of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Civil engineering sheet 2 Filter layer 3 Mesh reinforcing layer 4 Split yarn 5 Monofilament 6 Joint

Claims (1)

(57) [Scope of request for utility model registration] A split yarn split into one of the warp yarns.
Tensile strength is obtained by laminating and joining a filter layer in which a monofilament is roughly impregnated and woven into the other, and a mesh-like reinforcing layer using a monofilament in the weft.
A sheet for civil engineering characterized by having a permeability of at least 100 kg / 3 cm and a permeability of at least 3.0 × 10 ^-2 cm / sec.