JP6770213B1 - Synthetic fiber net material for civil engineering and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic fiber net material for civil engineering in which a foldable line portion is integrally formed in a part of a rigid net main body, and a method for manufacturing the same. SOLUTION: The net main body 20 is made entirely of resin and has a plurality of vertical strands 21 and a plurality of horizontal strands 22 intersecting with each other, and a single or a plurality of polygonal lines interposed in a part of the net main body 20. It is a synthetic fiber net material for civil engineering having a portion 30, and the rigidity of the folded wire portion 30 is reduced by reducing the diameter of the strand formed along the vertical direction of the knitted fabric over the section of the folded wire portion. It was lower than the rigidity of. [Selection diagram] Fig. 2

Description

The present invention relates to a net material applicable to civil engineering materials such as a futon basket, and is a synthetic fiber for civil engineering having a fold line portion that can be folded in a mountain or valley while maintaining rigidity sufficient to maintain a self-supporting shape. Regarding net material and its manufacturing method.

Patent Document 1 discloses a synthetic fiber net material mainly composed of high-strength polyethylene fiber and having excellent durability.
Patent Document 2 discloses a gabion made of a synthetic fiber net material in a box shape. The synthetic fiber net material used for the gabion knits two or more kinds of fiber yarns having different melting points to form a net-like material, and heat-treats the net-like material to thermoset the low melting point fiber yarns. The shape retention performance of the net material is improved.

JP-A-2017-2019 Japanese Unexamined Patent Publication No. 2002-69769

The conventional synthetic fiber net material has some problems as follows.
<1> In the synthetic fiber net material described in Patent Document 2, the rigidity of the entire net is increased and the shape retention performance is improved, but the higher the overall rigidity is, the worse the bendability of the net material is.
If the rigidity of the entire net material is lowered so that the net material can be easily bent, the shape retention performance of the net material is lowered.
As described above, it is technically difficult for the conventional net material to secure both rigidity and bend.
<2> In order to assemble a box shape using a high-rigidity net material, a method is known in which the butt edges of the divided net material divided into a plurality of pieces are spirally wound with a separate rope and connected.
This connecting method using a rope requires a lot of time and labor to wind the rope.
<3> A method is conceivable in which a cut is made in a part of the material of the high-rigidity net material to form a polygonal line, and bending is performed along the polygonal line.
This bending method not only has a strong weakness because a part of the material at the polygonal line is cut off, but also requires a large mechanical force as the bending force of the net material, so it can be easily bent only by human power. I can't.

The present invention has been made in view of the above points, and an object of the present invention is a synthesis for civil engineering in which a bendable polygonal line portion is integrally formed in a part of the net body while maintaining the rigidity of the net body. It is an object of the present invention to provide a fiber net material and a method for producing the same.

The present invention is made of a knitted fabric that is entirely made of resin, and has a grid-like net body in which a plurality of vertical strands and a plurality of horizontal strands intersect, and a single unit formed integrally with the net body and interposed in a part of the net body. Alternatively, it is a synthetic fiber net material for civil engineering having a plurality of folds, and the folds are continuously formed along the transverse direction of the net body, and the diameter of the vertical strands of the knitted fabric is set as a section of the folds. By reducing the diameter over the entire diameter, the rigidity of the folded wire portion is made lower than the rigidity of the net main body, and the resinized net main bodies adjacent to the folded wire portions are connected so as to be bendable.
Further, the present invention is made of a knitted fabric made of resinized synthetic resin, and is formed integrally with a grid-like net body in which a plurality of vertical strands and a plurality of horizontal strands intersect and a part of the net body. A method for manufacturing a synthetic fiber net material for civil engineering having a single or a plurality of folded wire portions, wherein the net body is formed by a bundled yarn made of a resinizable composite yarn, and the warp strand is formed by the bundled yarn. The process of knitting a synthetic resin knitted fabric having a small diameter over the section of the folded wire portion and heat treatment are applied to the synthetic resin knitted fabric so that the rigidity of the folded wire portion is lower than the rigidity of the net body. Has a process.
Further, in another embodiment of the present invention, the knitted fabric is knitted with a plurality of knitting yarns and a plurality of insertion bundle yarns, and the knitting yarns and the insertion bundle yarns are composite yarns containing a plurality of types of resin fibers having different melting temperatures. Consists of.
Further, in another embodiment of the present invention, the knitting yarn or the insertion bundle is formed between the warp fine strand in which the folding line portion is knitted with the bundle yarn of either the knitting yarn or the insertion bundle yarn and the adjacent warp fine strands. The cross strand is knitted in an X shape with the bundled yarn of any one of the yarns, and the vertical fine strand is formed to have a smaller diameter than the vertical strand.
Further, in another embodiment of the present invention, the knitted fabric is a public Russell knitted fabric.
Further, in another embodiment of the present invention, a plurality of polygonal line portions may be formed at intervals in the longitudinal direction of the net body.

The present invention has at least one of the following effects.
<1> Civil engineering that can be bent along the horizontal strands of the net body by making the diameter of the vertical strands of the knitted fabric smaller over the section of the fold line and making the rigidity of the folds lower than the rigidity of the net body. Synthetic fiber net material for use can be provided.
<2> By making the rigidity of the broken line portion lower than that of the net body, it can be easily bent along the broken line portion only by human power.
<3> Since the folded line portion can be formed at an arbitrary position of the synthetic fiber net material for civil engineering according to the bending position of the civil engineering material, the civil engineering material can be easily assembled.
<4> Since the net main bodies adjacent to each other are integrally connected, not only the cutting process of the net main body can be reduced, but also the connecting process using a separate connecting member such as a rope material can be reduced.
<5> Since it is only necessary to weave the folded line portion into a part of the knitted fabric using an existing knitting machine, the manufacturing cost of the synthetic fiber net material for civil engineering can be reduced.
<6> Since the cross strand regulates the bending position of the folded line portion to a fixed position, the corners formed by bending are neatly aligned and can be bent neatly.
<7> Since the cross strand exerts a reinforcing function, the strength and durability of the broken line portion are improved.
<8> By forming the folded line portion into a shape like a cross strand, it becomes a mark and the cutting work can be easily performed.

Overall view of civil engineering material using net material according to the present invention Top view of the net material that models the knitting direction of the knitting yarn Model diagram with enlarged polygonal line

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

<1> Outline of Synthetic Fiber Net Material for Civil Engineering Explaining with reference to FIG. 1, the synthetic fiber net material 10 for civil engineering (hereinafter referred to as “net material 10”) is made of resin strands at predetermined intervals. It has a net main body 20 made of a hard synthetic resin formed by intersecting and knitting in a grid pattern, and a single or a plurality of folded line portions 30 formed in a part of the net main body 20 so as to be integrally foldable with the net main body 20.

In the following description, the longitudinal direction of the net main body 20 at the time of manufacturing is defined as “Y”, and the direction orthogonal to the longitudinal direction of the net main body 20 at the time of manufacturing is defined as “X”.

The net material 10 is made by resinizing a knitted fabric made of synthetic resin, and the rigidity of the folded wire portion 30 is relatively low with respect to the rigidity of the net main body 20.
The net material 10 can be mountain-folded or valley-folded along a single or a plurality of folding line portions 30 formed along the X direction of the net main body 20.
The formation interval and the number of formations of the folded line portions 30 with respect to the net material 10 are appropriately selected according to the spread shape of the civil engineering material.
The net material 10 will be described in detail below.

<2> Knitted fabric The net material 10 is composed of a knitted fabric knitted using two types of thermoplastic resin fiber bundled yarns, a knitting yarn 23 and an insertion binding yarn 31, and the entire knitted fabric is heated to resin. It is a product.
As the knitted fabric, for example, Russell knitted fabric, double Russell knitted fabric and the like can be applied.

FIG. 2 shows a model diagram of the knitted fabric, (a) shows two knitting yarns 23 and 23 for chain knitting along the Y direction of the knitted fabric, and (b) shows the Y direction of the knitted fabric. The two insertion bundle yarns 31 and 31 knitted along the X direction are shown, and (c) shows the net material 10 in which (a) and (b) are united.

FIG. 3 shows a structure diagram of a part of the knitted fabric, and in each lane, a total of four knitted yarns, two knitted yarns 23 and 23 and two insertion bundled yarns 31 and 31, are used. Knit the knitted fabric.
The knitted fabric is knitted by supplying two knitting yarns 23 and 23 and two insertion yarns 31 and 31 for each lane, for a total of four yarns.
The reason why the knitting bundle yarn 23 and the insertion bundle yarn 31 are set as two units is that the knitted fabric has a double structure in which the front and back sides are integrated.
The knitting method of the knitted fabric is a known method.

<2.1> Material of knitted fabric The knitted yarn 23 and the inserted bundle yarn 31 constituting the knitted fabric are composite yarns in which a plurality of types of fibers having relatively different melting temperatures (melting points) are bundled.
The reason why the composite yarns having different melting points are used is that the net material 10 is thermoset to be resinized by utilizing the difference in melting points.
That is, the reason is that the resin fibers having a low melting point are melted and cured by performing a heat treatment at a predetermined temperature on the entire knitted fabric made of synthetic resin.
In this example, in order to make the invention easier to understand, a case where the composite yarn is composed of a mixture of two types of fibers, a low melting point fiber and a high melting point fiber, will be described, but the composite yarn may be a combination of three or more types of fibers.

<2.2> High Melting Point Fiber The high melting point fiber is a thermoplastic resin fiber having a higher melting temperature than the low melting point fiber, and constitutes the main fiber of the knitting yarn 23.
As the melting point fiber, for example, a polyester fiber such as PET (Polyethylene terephthalate), an aramid fiber, or the like can be applied.

<2.3> Low melting point fiber The low melting point fiber is a thermoplastic resin fiber having a lower melting temperature than the high melting point fiber, and constitutes a secondary fiber of the knitting yarn 23 and also serves as a fusion yarn.
As the low melting point fiber, for example, an olefin resin fiber containing polypropylene (PP) or polyethylene (PE) can be applied.

<2.4> Example of material combination When the high melting point fiber is a polyester resin fiber, an olefin resin fiber is combined as the low melting point fiber.
When the high melting point fiber is an aramid fiber, a polyester resin fiber may be combined as the low melting point fiber.

<3> Net main body The net main body 20 includes a plurality of linear or rod-shaped vertical strands 21 arranged along the Y direction and a plurality of horizontal strands 22 arranged along the X direction. It has a rectangular mesh 24 between the plurality of strands 21 and 22.
The net body 20 has enough rigidity (hardness) to maintain its self-supporting shape by itself.

<3.1> Vertical Strands of Net Body With reference to FIG. 2, the vertical strands 21 located in the Y direction of the net body 20 are two types of thermoplastic resin fibers, a knitting yarn 23 and an insertion binding yarn 31. It is constructed by knitting bundled yarn in a chain shape.

<3.2> Horizontal strands of the net body Explaining with reference to FIG. 2, the horizontal strands 22 located in the X direction of the net body 20 are composed of the insertion bundle yarns 31 and are between the adjacent vertical strands 21 and 21. A part of the insertion bundle thread 31 is hung on the thread.
The knitted fabric may be formed by exchanging the knitting bundle yarn 23 and the insertion bundle yarn 31.

<3.3> Method of adjusting the rigidity of the net body The rigidity (hardness) of the net body 20 is adjusted by selecting the mixing ratio of the high melting point fibers and the low melting point fibers constituting the knitting yarn 23 and the insertion bundle yarn 31. it can.
Increasing the mixing ratio of the low melting point fibers constituting the knitting yarn 23 increases the rigidity of the net body 20 (strands 21 and 22), and decreasing the mixing ratio of the low melting point fibers increases the rigidity of the net body 20 (strands 21 and 22). The rigidity is low.

<4> Folded line portion The folded line portion 30 is a portion that connects the net main body 20 so as to be bendable along the X direction, and is knitted as a continuous structure with the net main body 20.
The difference in configuration between the net body 20 and the folding line portion 30 is that the net body 20 knits the warp strand 21 using two types of bundled yarns, the knitting yarn 23 and the insertion bundle yarn 31, whereas the folding wire portion 30 is used. Then, the vertical strand is knitted only by the insertion bundle yarn 31.

Explaining with reference to FIGS. 2 and 3, the polygonal line portion 30 located in the transverse direction (X direction) of the net main body 20 includes a plurality of vertically thin strands 21a located in the Y direction between the pair of horizontal strands 21 and 21. It is composed of a cross strand 31a extending in an X shape between adjacent vertical thin strands 21a and 21a.

<4.1> Material of Folded Line The material constituting the folded line portion 30 is composed of two types of thermoplastic resin fiber bundled yarns, the knitting yarn 23 and the insertion binding yarn 31 described above.

<4.2> Vertical thin strand The vertical thin strand 21a is a strand located between the vertical strands 21 and is knitted only by the knitting yarn 23.
The reason why the vertical thin strands 21a are knitted only with the knitting yarn 23 in the section of the folded line portion 30 is that the diameter of the vertical thin strands 21a is smaller than that of the vertical strands 21.
By heating the knitted fabric having different diameters in the vertical strands to form a resin, the rigidity of the vertical thin strands 21a can be made lower than that of the vertical strands 21.

<4.3> Cross Strand The cross strand 31a is knitted only with the insertion bundle yarn 31.
In each lane, an X-shaped cross strand 31a is knitted by hanging an insertion bundle yarn 31 between adjacent vertical thin strands 21a and 21a.
Since the cross strand 31a is separated from the vertical thin strand 21a, it does not contribute to the improvement of the rigidity of the vertical thin strand 21a.

<4.4> Flexibility of the folded wire portion The net material 10 after the heat treatment can be bent around the folded wire portion 30 due to the difference in rigidity between the vertical strand 21 and the vertical thin strand 21a of the net main body 20.
In other words, the warp-thin strands 21a and the cross-strands 31a are separately knitted by the knitting yarns 23 and the insertion-bundle yarns 31 to impart flexibility to the warp-thin strands 21a and the cross-strands 31a, respectively. it can.
By making the vertically thin strands 21a and the cross strands 31a flexible, the folded line portion 30 can be bent.
By changing the diameters of the braided yarn 23 and the inserted bundled yarn 31 and the mixing ratio of the low melting point fibers of the composite yarns constituting the bundled yarns 23 and 31, the vertical fine strands 21a and the cross strands forming the folded wire portion 30 are changed. The flexibility of 31a can be adjusted as appropriate.
The flexibility of the folded line portion 30 is appropriately selected according to the use of the civil engineering material.

[Manufacturing method of net material]
Next, a method for manufacturing the net material 10 will be described with reference to FIGS. 2 and 3.

<1> Knitting process of knitted fabric As shown in FIGS. 2 and 3, two types of bundled yarns, a knitted yarn (for example, PP, PET) 23 and an insertion bundled yarn (for example, PP) 31, are used in a known knitting machine. Therefore, a knitted fabric having a uniform width having a strip shape is continuously knitted.
The net main body 20 uses a plurality of knitting yarns 23 and insertion bundling yarns 31 to cross the vertical strands 21 and the horizontal strands 22 and knit them in a mesh shape.

A single or multiple folding line portions 30 are knitted along the X direction in a part of the net main body 20 according to the bending position of the civil engineering material.
As shown in FIG. 3, the folded line portion 30 knits the vertical thin strands 21a only with the knitting yarn 23, and the insertion bundle yarn 31 is hung between the adjacent vertical thin strands 21a and 21a to form an X shape. The cross strand 31a is knitted.

<2> Knitted fabric cutting step The knitted fabric before heat treatment has appropriate flexibility as a whole. The net material 10 is cut along the X direction according to the developed shape of the civil engineering material in the uncured knitted fabric.
If the width of the knitted fabric is formed according to the width of the civil engineering material (width in the X direction), the loss of the knitted fabric is reduced.
The civil engineering material that can be produced by the net material 10 is not limited to the box shape, and the net main body 20 can be bent into a belly shape and used as a slope protection material.
Various civil engineering materials can be manufactured using the net material 10.

<3> Heat treatment step of knitted fabric Next, the entire knitted fabric is heat-treated at a predetermined temperature (about 200 ° C.). The predetermined temperature is the melting temperature of the low melting point fiber.

When the entire knitted fabric is heated to melt and cool the low melting point fibers in the knitted yarn 23 and the inserted bundle yarn 31, the resinified net material 10 is completed.
That is, the vertical strands 21 and the horizontal strands 22 that make up the net body 20 are made of resin to exhibit rigidity that allows them to stand on their own.
The vertical thin strands 21a and the cross strands 31a constituting the folded line portion 30 are also resinified in the same manner.

<4> Bending of net material The net material 10 is bent into a mountain fold or a valley fold along the folding line portion 30 to produce a desired civil engineering material.
Since the net material 10 can be easily bent around the folding line portion 30 only by human power, it is easy to assemble the civil engineering material.
Further, since the folding wire portion 30 integrally connects the adjacent net main bodies 20, not only the cutting process of the net main body 20 is reduced, but also the connecting step using a separate connecting member such as a rope material can be omitted. ..

As described above, in the net material 10 according to the present invention, since the knitting yarn 23 for knitting the folded wire portion 30 and the insertion bundle yarn 31 are separated to reduce the rigidity, only human power is required along the folded wire portion 30. It can be easily bent.

Further, by locating the cross strands 31a and 31a in an X shape between the vertically thin strands 21a and 21a of the folding line portion 30, the cross strands 31a and 31a are bent at an intermediate position between the vertically thin strands 21a and 21a. The variation in the bending position of the fine strand 21a becomes small. Therefore, the bending line of the net material 10 can be formed as a clean straight line.

10 ... Synthetic fiber net material for civil engineering (net material)
20 ... Net body 21 ... Vertical strand 21a ... Vertical thin strand 22 ... Horizontal strand 23 ... Knitting yarn 24 ... Mesh 30 ... Folded wire portion 31 ...・ Insert bundle thread 31a ・ ・ Cross strands constituting the folded line portion

Claims (9)

It consists of a knitted fabric that is entirely made of resin, and has a grid-like net body in which multiple vertical strands and multiple horizontal strands intersect, and a single or multiple polygonal lines that are integrally formed with the net body and intervened in a part of the net body. A synthetic fiber net material for civil engineering that has a part
The folded line portion is continuously formed along the transverse direction of the net body.
By reducing the diameter of the vertical strands of the knitted fabric to a smaller diameter over the section of the folded line portion, the rigidity of the folded wire portion is made lower than the rigidity of the net body.
A warp fine strand in which the folding line portion is knitted with either a knitting yarn or an insertion bundle yarn, and a bundle yarn of either a knitting yarn or an insertion bundle yarn between the adjacent warp fine strands. It is provided with cross strands knitted in an X shape, and the vertical thin strands have a smaller diameter than the vertical strands.
The fold line portion connects adjacent resin-made net bodies so as to be bendable.
Synthetic fiber net material for civil engineering. The knitted fabric is knitted with a plurality of knitting yarns and a plurality of insertion bundle yarns, and the knitting yarns and the insertion bundle yarns are composite yarns containing a plurality of types of resin fibers having different melting temperatures. Item 1. The synthetic fiber net material for civil engineering according to Item 1. The synthetic fiber net material for civil engineering according to claim 1, wherein the knitted fabric is a Russell knitted fabric. The synthetic fiber net material for civil engineering according to claim 1, wherein the net body has a plurality of folded lines at intervals in the longitudinal direction of the net body. A single or multiple net body made of resinized synthetic resin, in which a plurality of vertical strands and a plurality of horizontal strands intersect, and a grid-like net body formed integrally with the net body and interposed in a part of the net body. It is a method of manufacturing a synthetic fiber net material for civil engineering having a polygonal line portion of
While forming the net body with bundled yarns made of composite yarns that can be resinified,
A step of knitting a knitted fabric made of synthetic resin in which the diameter of the warp strand is reduced over the section of the fold line portion by the bundled yarn.
It is characterized by having a step of heat-treating a knitted fabric made of synthetic resin so that the rigidity of the folded wire portion is lower than the rigidity of the net main body.
A method for manufacturing synthetic fiber net materials for civil engineering. A knitted fabric is knitted using a plurality of knitting yarns and a plurality of insertion bundle yarns, and the knitting yarns and the insertion bundle yarns are composite yarns containing a plurality of types of resin fibers having different melting temperatures. The method for producing a synthetic fiber net material for civil engineering according to claim 5 . The method for producing a synthetic fiber net material for civil engineering according to claim 5 , wherein the knitted fabric is a Russell knitted fabric. A braided yarn having a diameter smaller than that of the warp strand is knitted on an extension line of the warp strand by either a braided yarn composed of a composite yarn or an insertion bundled yarn, and the braided yarn is between adjacent vertical fine strands. 6. The sixth aspect of the invention is characterized in that a cross strand is knitted in an X shape by the bundle yarn of any one of the inserted bundle yarns, and a folded line portion is formed by the plurality of vertical fine strands and the plurality of cross strands. The method for manufacturing a synthetic fiber net material for civil engineering described. The method for producing a synthetic fiber net material for civil engineering according to claim 5 , wherein a plurality of folded line portions are formed at intervals in the longitudinal direction of the net body.

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