JPH059866A - Method for strengthening seamed part of mesh sheet for civil engineering and building - Google Patents

Abstract

PURPOSE:To provide a lightweight seamed part excellent in strength and prevent the seamed part between sheets from breaking even in applying a tensile force. CONSTITUTION:A mesh sheet for civil engineering and building is obtained by laminating and forming nonwoven fabrics 3 on both selvage parts of a mesh sheet composed of warp strands 1, weft strands 2 and chain threads 5, impregnating a synthetic resin 7 and curing the synthetic resin. The mesh sheet is formed by feeding the plural warp strands 1 parallel to the whole width of the machine, simultaneously feeding the weft strands 2, arranged and extended parallel in the transverse direction of the machine and passing the chain threads 5 through the nonwoven fabrics 3 while inserting the nonwoven fabrics 3 into both selvage parts of the weft strands 1 and knitting the chain threads with the warp strands 1 and the weft strands 2. The resultant mesh sheet is then impregnated with a synthetic resin liquid, dried, cured and then cut to a suitable length to form unit mesh sheets. The selvage parts in which the nonwoven fabrics of the unit mesh sheets are laminated are mutually seamed at seam parts 6 and bonded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mesh sheet used for civil engineering work and construction work and a method for strengthening a stitched portion thereof.

[0002]

2. Description of the Related Art Soil foundations or grounds of building structures are used in construction works such as civil engineering and construction, for example, mountain control, flood control works, embankments, embankment works, road construction and improvement works for soft ground, coastal landfill, sludge ground, etc. A method of using a synthetic resin mesh sheet for drainage and reinforcement inside is widely used. As the mesh sheet, a synthetic resin film having slits formed by a carding machine to be defibrated into a net shape, a woven fabric, a knitted fabric, or a synthetic fiber impregnated resin-coated lattice sheet is also used. Has been done.

With regard to the woven mesh sheet, after weaving, it is impregnated with a synthetic resin and solidified to impart rigidity and misalignment prevention property, but it covers a wide range of land for the purpose of use such as coastal landfill. Therefore, as shown in FIG. 9, each mesh sheet 40 is cut into a predetermined length, for example, 2 m width,
10 x 30m by sewing 5 pieces of these ear ends
It is formed into a sheet with a certain area and is embedded. The mesh sheet is configured to have a breaking strength of about 5 t / m by strands of 6000 to 9000 d.

When the above mesh sheets are sewn together, the ear tissue 41 different from the mesh sheet portion is provided at a width of 5 cm to 25 cm at both ends of each mesh sheet in order to strengthen the sewn portion. The ear tissue 41 of each mesh sheet 40 to be sewn is 5 cm to 10 cm.
Overlapping widths, 1000-5000d on top
The high-strength synthetic fiber sutures are sewn in 3 to 6 rows.

Further, in the case of a mesh sheet made of a knitted material, for example, a warp knitted mesh sheet, it is simply impregnated with a synthetic resin liquid and solidified, and then both ends of each mesh sheet are sewn together.

Further, after the both ends of each mesh sheet 40 are sewn together, a canvas 42 is connected to the peripheral edge of one sheet with a rope to reinforce the peripheral edge portion. Further, there is also a case where the mesh sheets are sewn to both ends of the mesh sheet through a reinforcing material.

[0007]

As described above, when the mesh sheet currently used is a woven fabric, the warp density of the selvedge tissue is increased and the weft strands of the mesh portion are not aligned in the production process. It is possible to increase the number of intersections with each one of them and to further impregnate and solidify the warp and weft and the intersections with synthetic resin, so strong ear tissue is formed even in the tensile strength test of the sutured part after suturing. Although the suture thread is not broken, the weft thread is broken at the boundary between the ear tissue portion and the mesh portion.

Further, since the canvases on the periphery of the connected mesh sheets are connected by ropes, it is laborious to tie the ropes, and when the tying is bad, or a pulling force acts on the rope insertion hole of the canvas. There is a drawback that it breaks.

Further, when stitching to both ends of each mesh sheet via a reinforcing material, the reinforcing material must be manufactured separately, and the stitching is performed while being joined to the mesh sheet.
Work efficiency is poor.

In a mesh sheet made of knitted fabric,
In terms of production, the warp has a limited density due to the knitting gauge and the guide hole diameter, and the density of the warp cannot be increased as in a woven fabric. Further, the warp yarn and the weft yarn are only held by the chain knitting loop, and the pull-out resistance of the weft yarn itself from the selvage warp is smaller than that of the woven fabric. Therefore, even if the chain thread is cut even if it is impregnated with a synthetic resin and solidified and sewn, the weft thread comes off and the sewing strength becomes low.

When the sheet connecting portion is broken during the soil covering work as described above, in the case of soft ground, soil and sludge intrude from the broken portion, the reinforcing effect of the mesh sheet and the drainage effect are lost, and the soil is removed from the mesh sheet. There was a problem that the fractured part could not be repaired after it was charged.

[0012]

Means for Solving the Problems The present invention is intended to solve the above-mentioned drawbacks, and a nonwoven fabric is laminated and formed on both ends of a mesh sheet consisting of warp strands, weft strands and chain yarns, and synthetic resin is formed. Constructed into an impregnated and solidified civil engineering and construction mesh sheet, supplying multiple warp strands in parallel across the entire machine width and weft strands arranged in parallel across the machine transverse direction, to both ears of the warp strands. While inserting the non-woven fabric, a chain yarn is knitted through the non-woven fabric into warp strands and weft strands to form a mesh sheet, which is then impregnated with a synthetic resin solution, dried and solidified, and then appropriately lengthened. A mesh sheet for construction and construction, in which a unit mesh sheet cut into pieces is formed, and the edge portions of the unit mesh sheet on which the non-woven fabric is laminated are sewn together and joined. It is intended to strengthen the suture portion.

The present invention is a warp knitting machine capable of inserting warp and weft and inserting a non-woven fabric in the full width or a part thereof, for example, Karl May.
er RS3MSU-V, RS3P-MSU-V, R
LIBA, a model for knitting multi-axial multi-layer structures such as S2DS
COPCENTRAMULTI AXIAL machine, C
OP-HS2-ST-MS5-VU etc. can be used.

As the filaments forming the warp strand, polyester, polyamide, polyacrylonitrile, polyvinyl alcohol, polyolefin, etc. may be used. A polyester filament is particularly preferable. Filament strength is 3-10g
/ D. The strand is 500-30000d,
Particularly, 10,000 to 20,000 d is preferable.

As the weft strand, various filaments can be used similarly to the warp strand. Strands are 500-20000d, especially 1000-10000d
Is preferred. The warp strands may be aligned yarns or twisted yarns. The warp density is 20 to 200 lines / m, and preferably 30 to 100 lines / m. Weft density is 10-100 filaments / m, 2
0 to 70 lines / m is preferable.

As the non-woven fabric, a filament made of polyester, polyamide, polyacrylonitrile, polyvinyl alcohol, polyvinyl chloride, polyethylene or the like, or a staple can be used. In particular, those made of polyester are preferable. The filament or staple is about 1 to 30 d, and especially 3 to
10d is preferable. These fibers are entangled and integrated by a needle punch method, a water jet entanglement method, or a long fiber nonwoven fabric manufacturing method by a spun bond method. The basis weight of the nonwoven fabric is preferably ²⁰ to 500 g / m ² , and particularly preferably 50 to 100 g / m ² .

According to the RS3M SU-V machine, as shown in FIG. 4, the warp strands 11 are supplied from the fixed reeds 18 and the weft strands 12 are inserted orthogonally to the warp strands 11. On the other hand, the non-woven fabric 13 is supplied to both end portions from the same direction as the warp strands 11. The weft strand delivering / sinker device 15 advances the weft strands 12 one row at a time for each stroke of the knitting needle 14, and brings the weft strands 12 to the rear side of the knitting needles 14. In the meantime, the knitting needle 14 is the nonwoven fabric 1
3 is pierced through, and on the return stroke, the stitch is knitted by the chain yarn 16 supplied from the knitting reed 17. By this stitch,
The weft strands 12 are fixed on the non-woven fabric 13. As a result, as shown in FIG. 6, the knitted fabric 19 in which the nonwoven fabric 13 is inserted on the back side of the warp strands 11 and the weft strands 12 is formed.

According to the RS3P-MSU-V machine, as shown in FIG. 5, the warp strands 11 have the fixed reed 1 from the machine direction.
8 and the weft strands 12 are supplied from below by a conveying device. On the other hand, the non-woven fabric 13 is supplied to both end portions from the same direction as the warp strands 11. The feeding device 15 for the weft strands 12 advances the weft strands 12 in rows from below. In the meantime, the knitting needle 14 inserts the non-woven fabric 13, and in the returning stroke, the chain yarns 16, 16 supplied from the knitting reeds 17, 17 are knitted by the movement of the knitting reeds 17, 17. As a result, as shown in FIG. 7, a knitted fabric 19 in which the nonwoven fabric 13 is inserted between the warp strands 11 and the weft strands 12 is formed. The knitting by the warp knitting machine is described in JP-B-60-30768.

LIBA COPCENTRAMULT
According to the IAXIAL machine, as shown in FIG. 8, a knitting needle 21 provided with a slider 22, a reed 23 of a chain yarn 24, a knockover arm 25, and a knitting part including a trace arm 26 are provided, and a nonwoven fabric 27 is used as the knitting part. The guide 28 guides the weft strands 29 to form weft strand groups. The weft strands 29 are inserted into the non-woven fabric 27 conveyed to the knitting section by a machine-direction conveying device. By the movement of the reed 23, the chain yarn 24, the weft strand 29, and the warp strand 31 are knitted by the knitting needle 21, and the knitted fabric 30 is sent out from the knitting portion. Regarding the above-mentioned warp knitting machine
110956.

These knitted fabrics are made rigid by applying an acrylic resin with a resin processing machine. The resin is a cellulosic resin,
Any resin such as polyethylene resin, polypropylene resin, polyurethane resin, polyvinyl chloride resin can be selected.
The resin is applied in a solid amount of about 20 to 50% by weight of the knitted fabric. If it is less than 20% by weight, the hardness of the sheet is insufficient and misalignment occurs. If it exceeds 50% by weight, it is uneconomical because of excessive adhesion. As the applying method, any means such as a fluidized dipping method, a spray method, and a dispersion method can be used.

After that, the edge of the knitted fabric is sewn with a suture thread. As shown in FIG. 1, the suturing method includes mesh part warp strand 1, weft strand 2, nonwoven fabric 3, ear tissue part warp yarn 4, ear tissue part non-woven fabric stop loop yarn 5, suture thread 6, synthetic resin. method of bonding to laminate a nonwoven fabric side ends of 7 and the sheet S ₁ and the sheet S ₁ which is coated with, as shown in FIG. 2, the sheet S ₁ and having no nonwoven ears having ears with non-woven fabric A method of joining the end portions of the attached sheet S ₂ to each other, a method of placing the sheets S ₁ and S ₁ having the ears having a nonwoven fabric side by side as shown in FIG. 3, and the like are performed.

As the suture thread, four polyester threads of 1000 to 5000 d are used and are simultaneously sutured by a sewing machine equipped with four sewing machine needles. The suture can be used in the range of 100 to 10,000 d. As the yarn, synthetic fiber yarn such as polyamide yarn can also be used. Any sewing machine needle may be used as long as it has one to four needles. The more sewing needles, the more efficient.

[0023]

Since the present invention is constructed as described above, the mesh sheet is lightweight and has excellent strength, and the stitched portion between the sheets does not break even when a tensile force is applied.

[0024]

[Example] Karl for knitting a mesh sheet with a non-woven fabric
An RS3M SU-V machine from Mayer was used. 18
A polyester multifilament of 000d was used as warp strands and the density was 59 filaments / m. One 4500 d polyester multifilament was used as the weft strand, and was inserted so that the density was 59 filaments / m. A polyester multifilament of 250d was used as a loop yarn to restrain these warp strands and weft strands. In addition, 450 as a weft strand at the edge of the ear
The polyester multifilament of 0d is used at a density of 59 filaments / m, the polyester multifilament of 4500d is used for the warp strand, and 35 binding yarns of the polyester multifilament of 250d are also used for about 10c.
I used it for both ears in m width and hung all the reed strands on the guide. Separately prepared 10 cm wide polyester spunbonded non-woven fabric (weight per unit area: 200 g / m ² ) was inserted into the tissue portion of both ears during knitting, and the polyester multifilament of 250d was chain-knitted to unite the warp and weft strands and the non-woven fabric.

In this way, the warp knitting mesh machine in which the non-woven fabric is integrated at both ends is impregnated with the acrylic resin liquid by a resin processing machine, squeezed by a squeezing roller, widened by a tenter, and dried by a dryer. Acrylic resin was added to obtain a rigid mesh sheet.

Next, the above-mentioned length 30 extended in the sewing process.
The non-woven fabric portion at the edge of two sets of m mesh sheets was sewn with four 3000 d polyester sutures by the sewing method shown in FIG. As a result, a warp knitted mesh sheet capable of covering a wide range of ground having a sewn portion containing a nonwoven fabric was obtained.

For comparison, the mesh sheets obtained in the above-mentioned examples were tested with a non-woven fabric-free mesh sheet for the tensile strength in the width direction of the sewn portion. As a result of the test, the breaking strength of the sewn portion of the mesh sheet containing the nonwoven fabric is 117 k.
Although it was g / m, the breaking strength of the sewn portion of the mesh sheet having no nonwoven fabric was 4000 kg / m. Therefore, the mesh sheets of the examples were confirmed to have an excellent reinforcing effect as compared with the mesh sheets of the comparative example. In addition, the weft strands of both mesh sheets fell off from the ear tissue portion at the time of breakage.

[0028]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the weft strand is not only passed through the loop of the chain yarn but is also integrated with the non-woven fabric, and the loss of the weft strand is greatly reduced. As a result, the strength of the sewn portion is improved, the durability against repeated load is great, and the sheet can be used as a civil engineering and construction sheet for a long period of time.

Therefore, even if it is used at the bottom of the embankment, it is stable and it is possible to safely and reliably carry out the construction of the landfill cover of soft ground. Also, the ground is reinforced even when used for roads,
It is also used for drainage materials such as groundwater and revetments for rivers and the sea.
In addition, it can be widely used as a civil engineering material such as a waterproof sheet and a waterproof sheet, and a building material such as a curing sheet.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an edge portion of a sheet having an ear portion having a nonwoven fabric, the nonwoven fabric sides being joined together so as to be laminated.

FIG. 2 is a cross-sectional view of an edge portion in which the edges of a sheet having an ear portion having a nonwoven fabric and a sheet having an ear portion having no nonwoven fabric are joined together.

FIG. 3 is a cross-sectional view of an ear end portion in which sheets having an ear portion having a nonwoven fabric are provided side by side.

FIG. 4 is an enlarged view of a knitting unit formed by an RS3M SU-V machine.

FIG. 5 is an enlarged view of a knitting unit formed by an RS3P-MSU-V machine.

FIG. 6 is a schematic cross-sectional view of a knitted fabric by an RS3MSU-V machine.

FIG. 7 is a schematic cross-sectional view of a knitted fabric by an RS3P-MSU-V machine.

FIG. 8 is an enlarged view of a knitting section formed by a COPCENTRAMULTI AXIAL machine.

FIG. 9 is a plan view of a conventional civil engineering and construction sheet.

[Explanation of symbols]

1 Strand of mesh 2 weft strands 3 non-woven fabric 4 Transstrand of ear tissue 5 Loop yarn for non-woven fabric of ear tissue 6 sutures 7 Synthetic resin layer 11 Sutra Strand 12 weft strands 13 Nonwoven fabric 14 knitting needles 15 Weft delivery and sinker device 16 chain thread 17 formation reed 18 fixed reed 19 knitted fabric 21 knitting needles 22 Slider 23 Reed 24 chain thread 25 knock over comb 26 Trace Comb 27 non-woven fabric 28 Guide 29 weft 30 knitted fabric 40 mesh sheet

Claims (2)

[Claims] 1. A mesh sheet for civil engineering and construction in which a nonwoven fabric is laminated and formed on both ends of a mesh sheet composed of warp strands, weft strands and chain yarns, and synthetic resin is impregnated and solidified. 2. A plurality of warp strands are fed in parallel over the entire width of the machine and weft strands arranged in parallel over the cross machine direction are fed, and a chain yarn is inserted while inserting a nonwoven fabric into both ends of the warp strands. A mesh sheet is formed by passing through the nonwoven fabric and knitting into warp strands and weft strands, then impregnating the mesh sheet with a synthetic resin solution, drying and solidifying, and then cutting the unit mesh sheet into an appropriate length. A method for strengthening a sewn portion of a civil engineering or construction mesh sheet, which is formed and sewn together the edge portions of the unit mesh sheet on which the non-woven fabric is laminated to each other.