JP2934527B2 - Civil and architectural mesh sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh sheet for civil engineering and construction used as a reinforcing and shielding material in the field of civil engineering and architecture, and the mesh sheet is particularly useful for landfilling and embankment in the civil engineering field. It is useful as a soil reinforcement material.

[0002]

2. Description of the Related Art Conventionally, as a soil reinforcing material in the above-mentioned field, there is a grid-like sheet known by a name such as geogrid or geotextile. The lattice-like sheet has a woven fabric and a knitted fabric, and in the case of a woven fabric, the intersection of the warp and the weft is devised so that the warp and the weft are each linear in order to increase the strength utilization rate of the fiber. Organization. However, since the fabric is a woven fabric, the warp and the weft go up and down at the intersection, so that the warp and the weft do not form a straight line, and the above object has not necessarily been achieved. There is also a method in which two wefts are alternately twisted like a leno weave, and a weft is sandwiched between them, but by bending the two warps alternately (the weft passes through between them), The tensile strength is lower than the straight line, and the
Since it is made of a book, there is a possibility that the strength contribution ratio may vary as compared with that of a single book, and further, there is a disadvantage that the elongation change under a constant load is increased.

On the other hand, as a knit, a weft insertion type in which a weft strand is inserted over the entire width and a warp insertion type in which a warp strand is inserted over the entire length are generally used. For example, there is Japanese Utility Model Publication No. 2-17030 as a meridian insertion method. In this method, 8000 is used as a strand.
When a d / strand is required, a 2000d / guide reed (whether or not it is fully packed is determined by the grid size at that time) is prepared, and a ground knitting yarn made by another reed (in this case, 4 ground knitting yarns and 2000d) is inserted through the interneedle. Furthermore, there is an insertion yarn into which two loops of these ground knitting yarns can be inserted by inserting between two needles as a squeezing yarn from a reed different from the ground knitting yarn. The interval between the warp-inserted yarns of 2000d, which had been inserted through the street as described above, is reduced, resulting in 8000d / strand. The advantage of this is, of course, that the warp strand and weft strand are aligned, and that there is no bending, so that not only the strength utilization rate is excellent, but also the yarn before assembly (in this example, the 2000d yarn) itself passes through the guide hole of the reed. even been to
If it is, it can be knitted. However, the thicker the strand, the more yarn from the guides
There is a disadvantage that the use of the book as a transstrand results in the transstrand becoming flattened as a result. The flattening can be prevented to some extent by enlarging the guide holes. However, in this method, there is a limit to the range in which the guide holes can be enlarged. As a result, a wide belt-shaped warp strand is formed, and the number of meshes / m ² decreases and the mesh size decreases. As a result, there is a disadvantage that the interlocking effect due to the mesh (the effect that the upper and lower soils are connected in a bridge shape via the mesh and become integral with the reinforcing material) is reduced.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a warp-insertion type knitted fabric which aims to prevent clogging due to flattening of a warp stride. It is.

[0005]

The mesh sheet for civil engineering and construction according to the present invention has a thickness of 5,000 to 150,000 in which a warp is inserted into the ground structure of a chain knit made of filament yarn or spun yarn having a thickness of 800 d or less. In the warp fiber bundle of (d) and the lattice-like warp knitted structure in which the weft fiber bundle of 3,000 to 150,000 d inserted in the entire knitting width as the weft insertion yarn is arranged, the warp fibers and / or Weft fiber is passed through the pipe guide
And bundled in a cylindrical shape to form a bundle of warp and / or weft
The point is that it is a bundle .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention reduces the clogging caused by the flattening of strands by consolidating the trans-strands and / or weft strands into a columnar shape, and is useful when the strands are buried in the soil for civil engineering purposes. Can be prevented from deteriorating.

In the present invention, a plurality of filaments
After converging on one pipe guide, it became possible to converge the strand into a cylindrical shape by using it as a warp or weft strand. That is, since the filaments are once focused on one pipe guide, almost uniform tension is applied to all the filaments, and the strands do not flatten.

[0008] A specific example will be described below. In the present invention, a warp strand having a thickness of 5,000 to 150,000 d in which a warp is inserted into a filament yarn or a spun yarn having a thickness of 800 d or less and constituting a ground structure is used. On the other hand, if the thickness of the entire strand is too small, sufficient strength cannot be obtained, and if it is too large, the rigidity becomes strong and it becomes difficult to handle. Weft strands of 3,000 to 150,000d are used. The material of the fibers constituting the warp and weft strands is not particularly limited, and other than synthetic fibers, regenerated fibers, and natural fibers, those containing metal fibers, carbon fibers, and aramid fibers can also be used. Particularly, polyester fibers are preferable.

The resin for coating and impregnating the lattice-like warp knitted structure is not particularly limited, and a thermosetting resin such as an epoxy resin or a thermoplastic resin can be used.

[0010] A 9-gauge ratchet machine of the weft insertion type was used, and polyester yarn (150
Using a 30,000 d / strand made of 0d multifilament), an attempt was made to create a mesh sheet in which the trans-strand was cylindrical and the weft strand was not cylindrical.

The warp strands are prepared by warping a predetermined number of polyester 1500d multifilaments, and a set of 20 filaments (30,000d as strands) is passed through a guide guide into a pipe of a pipe guide prepared to a mesh size. lead. (At this time, the multifilament is set at a predetermined d /
By warping the strand, the flattening of the strand can be prevented. With this
Can obtain a cylindrical warp strand
You. )

On the other hand, 20 plied yarns of 1,500d polyester filament having a twist of 80 turns / m as a weft strand are supplied from a creel to a weft insertion device adjusted to a mesh size, and are provided in a stitch at a specified pitch. [At this time, as a method of inserting the weft strand by one, in addition to inserting the weft strand by a predetermined d / strand / course, the weft strand is divided in advance into equal parts, and the divided number is inserted by one per strand / course (for example, 30,000d / strand 1,
If 500d x 10 strands = 15,000d, and it is 15,000d / course x 2 courses, the weft strands will be a pair of adjacent ones.
Can be done). At this time, a chain knitting was made using 250d of polyester multifilament as a ground knitting yarn, and a 30,000d aligned yarn bundle was inserted through a pipe guide in the loop by a warp insertion method. At this time, if the feeding amount of the chain stitch is reduced, the warp strand is likely to meander, so the feeding amount is increased.

For the purpose of further preventing misalignment, another 250d polyester multifilament is used and inserted into the chain stitch in the same manner as the warp strand, and then to the weft strand, and then to the next chain stitch along the weft strand. Move it, insert it into the chain in the same way as the warp strand, and when it reaches the next weft strand, return to the original chain stitch along the weft strand, repeat the movement of warp insertion, repeat the number of warp strands The same number of misalignment preventing yarns may be knitted.

As another method, a 250d polyester multifilament is made into a double denby structure with two reeds, and each sinker loop holds 30,000 d supplied from a pipe guide from the side, while the weft strand is formed into a stitch loop. With a 250d multifilament, insert between two needles (2-2,1-1, / 0-0,1-1) by restraining by weft insertion method, and press the transstrand from the opposite surface. It may be cylindrical.

It is also effective to form ear tissue as needed in the resin application step described below, particularly in that the ear can be fixed to a pin tender and processed under tension, and the sheets can be easily sewn together. . The ear tissue preferably has a width of 30% or less of the entire knitting width. This time, to make 10cm wide ear tissue, 36 single ears were packed with 1500d polystyrene multifilament and 36d of 250d polyester multifilament.
1500d was inserted into the chain in a full-packed form, and 36 other 250d polyester multifilaments were packed in a tightly closed chain to obtain ear tissue. Of course, the weft insertion thread also passes through this ear tissue. The mesh of the columnar strand obtained in this way is heat-cut at the end of the eye on a warp knitting machine,
The ear was prevented from coming off.

The mesh sheet thus obtained may be further impregnated with a resin. By impregnating the acrylic resin emulsion solution and drying and solidifying,
A rigid resin-impregnated mesh sheet was obtained.

At this time, when the length of the trans-strand of the greige machine and the number of meshes / m ² are the same, for example, when the method is carried out by the method of Japanese Utility Model No. 2-17030 which is one of the conventional methods, the following results are obtained.
Given the guide holes and guide spacing of a 9 gauge warp knitting machine, 7
It is said that the maximum thickness that can be knitted is 500 to 9000d, but from the viewpoint of stable operation, if it is 7500d, the 30,000d strand is 7500d x 4, which is 1500d x 4, and the 1500d multifilament 20 yarns will be aligned. Insert the 4 of this 7500d / guide and insert another 25
When the amount of the thread inserted between the two needles at 0d is reduced and squeezed, the four yarns at 7500d are drawn and flattened so that the four yarns run in parallel. The width of this flat strand is 5.2-5.5mm
It is about. Also, when the mesh size is designed to be 20 mm in latitude × 20 mm in longitude with the mesh inside size, 39 mesh in the above method
/ m number of stitches. On the other hand, if the same mesh size is knitted in the present invention, the 30,000 d strand is 2.55 mm, and the number of stitches is
44 mesh / m, same design strength (strand d is the same. However, it seems that the strength contribution rate is higher in a columnar shape than in a flat shape) and the eye size is the same The number of eyes increases by 12.8%. If this is carried out by a conventional method using an 18 gauge warp knitting machine without a single needle, the warp strand is expected to become wider and around 10 mm.
Therefore, the number of stitches / m is also 33 mesh / m, and the difference is 33.3%.
As a result, there is a large difference in the interlocking effect of the soil when buried in the soil for civil engineering.

[0018]

According to the present invention, the mesh sheet can be prevented from being clogged even when a thick strand is used by preventing the warp or weft strand from flattening, and the interlocking effect can be prevented. Thus, it has become possible to provide a mesh sheet for civil engineering and construction having a more excellent reinforcing effect.

[Brief description of the drawings]

FIG. 1 is a schematic view of a civil engineering / architectural mesh sheet of the present invention.

FIG. 2 is a schematic view of a conventional mesh sheet.

[Explanation of symbols]

 A trans strand A 'trans strand B weft strand B' weft strand

Claims (1)

(57) [Claims] 1. A bundle of warp fibers having a thickness of 5,000 to 150,000d in which a warp is inserted into a ground structure of a chain knit made of a filament yarn or a spun yarn having a thickness of 800d or less, and a weft inserted into the entire knitting width. In a lattice-like warp knitted structure in which a weft fiber bundle having a thickness of 3,000 to 150,000 d inserted as a yarn is arranged, the warp fibers and / or weft fibers pass through a pipe guide.
And bundled in a cylindrical shape to form a bundle of warp and / or weft
A civil engineering / architectural mesh sheet characterized in that it is a bundle .