JPH1054035A - Soil structure reinforcing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soil structure reinforcing material capable of preventing the sliding phenomenon of soil in a soil structure and efficiently reinforcing the soil structure having high strength, low ductility and high pull-out resistance in soil. SOLUTION: A soil structure reinforcing material is so constituted that projections of filament yarn with over 500 denier are formed in at least some crossings on one side of lattice-like woven fabric 2 of 10-100mm having one side woven from filament yarn such as polyester texture with over 500 denier, 8g/d of strength and ductility less than 15% as warp and weft and are coated with synthetic resin. In that case, tensile cutting strength in the vertical and horizontal directions is excess of 2000kg/m, cutting ductility is less than 20%, and intermediate tensile stress is in excess of 65% of cutting strength in the case 80% of cutting ductility is expaned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth structure reinforcing material laid in the soil for the purpose of reinforcing an earth structure such as soft ground reinforcement and embankment reinforcement.

[0002]

2. Description of the Related Art Conventionally, reinforced nonwoven sheets and woven sheets have been used as reinforcing materials for soil structures for the purpose of reinforcing soil structures such as soft ground reinforcement and embankment reinforcement.
Soil pull-out resistance was not sufficient, and soil slippage was likely to occur. In recent years, Japanese Patent Laid-Open No. 5-125733
In many cases, a net-like sheet in which a resin material is impregnated into a grid-like fiber material as proposed in Japanese Patent Application Publication No. 6-32977 or Japanese Patent Publication No. 6-32977 has been used, and the slip phenomenon of soil has been remarkably improved. Japanese Patent Application Laid-Open No. 63-70720 discloses a net-like sheet in which fiber bundles arranged in a rope shape, a tape shape, or a belt shape are arranged in a net shape and impregnated with a resin. A formed net-like sheet is disclosed.

The sheets described in the above-mentioned Japanese Patent Application Laid-Open No. 5-125733 and Japanese Patent Publication No. 6-32977 have a function of considerably preventing the slippage of the soil, but they are not yet sufficient. Further, the sheet having projections described in Japanese Patent Application Laid-Open No. 63-70720 has the ability to further prevent the slip phenomenon of the soil, but has a technical problem in terms of manufacturing.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and it is possible to prevent the slipping phenomenon of soil in an earth structure and to effectively reinforce the earth structure. ,
It is an object of the present invention to provide a structural reinforcing material that can easily form a projection.

[0005]

SUMMARY OF THE INVENTION The present invention achieves the above object and has a strength of at least 500 denier and a strength of 8 g / d.
As described above, a protrusion made of filament yarn of 500 denier or more is formed on an intersection of at least a part of at least one side of a lattice woven fabric having a side of 10 to 100 mm woven with a filament yarn having an elongation of 15% or less as ground warp yarn and ground weft yarn. Is formed, the surface of the lattice-shaped woven fabric is covered with a synthetic resin, the tensile strength in the warp direction and the weft direction are both 2,000 kg / m or more, the cutting elongation is both 20% or less, and the cutting elongation is 20% or less. 8
A reinforcing material for earth structure, wherein the intermediate tensile stress at 0% elongation is 65% or more of the cutting strength, and 500
10 to 1 side woven as a warp with a filament yarn having a denier of 8 g / d or more and an elongation of 15% or less.
A protrusion made of a filament yarn of 500 denier or more is formed on at least a part of intersections of at least one side of a grid-like woven fabric of 00 mm, and the surface of the grid-like woven fabric is covered with a synthetic resin. Is 2000kg / m or more,
A soil characterized by a cutting elongation of 20% or less, an intermediate tensile stress at 80% elongation of the cutting elongation of 65% or more of the cutting strength, and a tensile cutting strength in the weft direction of 300 kg / m or more. The gist is a structural reinforcing material.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

FIG. 1 is a schematic diagram showing an example of a basic form of an earth structure reinforcing material 1 of the present invention in which a grid-like woven fabric 2 having a projection formed on one surface of an intersection is covered with a synthetic resin 3. FIG.
FIG. 1 is a schematic diagram showing an example of a basic form of an earth structure reinforcing material 1 of the present invention in which a grid-like woven fabric 2 having projections formed on both sides of an intersection is covered with a synthetic resin 3.

FIG. 3 is a schematic cross-sectional perspective view of the cross section of the lattice-shaped woven fabric 2 shown in FIG.
A projection 6 is formed on one side of the intersection of the lattice-like ground structure composed of the ground weft 5 and the ground weft 5 to form a lattice-like woven fabric having the projections formed thereon. The surface of the lattice-like woven fabric is covered with the synthetic resin 3. I have.

FIG. 4 is a schematic perspective cross-sectional view of the vicinity of the intersection of the grid-like woven fabric 2 in FIG.
The projections 6 are formed on both sides on the intersection of the lattice-like ground structure composed of the ground weft 5 and the ground weft 5, and the lattice-like woven cloth has projections formed on both sides. The surface of the lattice-like woven cloth is covered with the synthetic resin 3. Have been.

In the case where the lattice-shaped woven fabric having the projections used in the present invention has projections formed on one side, for example, the front side fabric structure 7 as shown in FIG. Cutter cloth 1 while weaving the middle of the connecting yarn 9 of the three-dimensional fabric comprising the backing fabric 8 and the connecting yarn 9
It can be obtained by making a horizontal incision at 0 and separating the front and back sides.

In the case of forming projections on both sides, weaving is carried out, for example, with a towel loom according to the organization diagram of FIG.
A lattice-like woven fabric having loop-like projections 12 formed on both sides of the ground structure 11 can be used.

FIGS. 1 and 2 show an example in which projections are formed at all intersections. However, it is not necessary that projections be formed at all intersections as long as the effects of the present invention are exhibited. It is sufficient that the projection is formed at least at some of the intersections. The number or density of the formed protrusions may be arbitrarily selected and determined according to the size of the lattice, the height of the protrusions or the required degree of pull-out resistance, and 20% or more of the number of all intersections is effective. It is. Of course, even if projections are formed at all intersections, there is no restriction.

The height of the projection formed by the filament yarn is preferably 1 to 30 mm, more preferably 3 to 20 mm. If it is less than 1 mm, the frictional resistance with the soil is not so much improved. Less effective. Also, 30mm
If the ratio exceeds, the projections become too high, and it may be difficult to impregnate the resin.

[0014] The reinforcing member for earth structure of the present invention has a side of 10 to 10
The base fabric is a 100 mm lattice woven fabric. This is because the type of soil used for the soil structure can vary from very small particles, from cobble stones, rubble stones, crushed stones, natural soils mixed with soil and stone, and even from the civil engineering or construction sites. Since the soil selected appropriately from these is used for the soil structure, the bridging or meshing effect between the soil and the soil, the frictional resistance with the reinforcing material laid in the soil or the pull-out resistance is reduced. This is to make it work effectively. If the length of one side of the grid is less than 10 mm, the bridging or meshing effect via the net-like reinforcing material cannot be expected, and if it exceeds 100 mm, the strength required for reinforcement becomes difficult to obtain, Due to the large interval, the effect of preventing soil slip may be impaired depending on the type of soil.

As the filament yarn in the present invention, a fiber material suitable for the required performance may be selected, and polyamide fiber, polyester fiber, vinylon fiber, aramid fiber, polypropylene fiber, acrylic fiber, glass fiber, carbon fiber, etc. And multifilaments or monofilaments thereof, and these original filaments may be used.

In the present invention, as the ground warp or ground weft of the lattice-like woven fabric, a filament yarn of 500 denier or more is used, and a filament yarn of 1000 denier or more is preferably used. If the yarn is less than 500 denier, it is difficult to secure performance in terms of tensile cutting strength.

In the present invention, the ground warp has a strength of 8 g /
A filament yarn having an elongation of 15% or less and d or more is used.
If the strength is less than 8 g / d, it may not be able to withstand the stress applied during and after construction. If the elongation is 15% or more, the reinforcement may be stretched when the debris slips after construction, and collapse may occur. Preferably it is 10% or less. If the same performance is required in the weft direction as the warp direction as the soil structure reinforcing material, a filament yarn having the same performance as the ground warp is used for the ground weft.

In the present invention, the fibers forming the projections are filament yarns of 500 denier or more. 50
If it is less than 0 denier, it may be difficult to withstand the pull-out resistance caused by the slipping phenomenon of the soil on the reinforcing material laid in the soil of the soil structure.

The earth structure reinforcing material of the present invention has a tensile cutting strength in the warp direction of 2000 kg / m or more and a cutting elongation of 20% or less. This is to sufficiently fulfill the original purpose of the reinforcing material for soil structures, such as strengthening the ground with high strength and preventing the slipping phenomenon of the soil.
/ M, or the elongation at break exceeds 20%, the original purpose cannot be achieved.

Further, in the earth structure reinforcing material of the present invention, the intermediate tensile stress at the time of elongation at 80% of the elongation at break in the warp direction is 65% or more of the tensile breaking strength. This is an indispensable element to prevent the soil sliding phenomenon caused by the extension of the reinforcing material laid in the soil with small stress, and 80% of the cutting elongation
In the case of a reinforcing material whose intermediate tensile stress during stretching is less than 65% of the tensile breaking strength, it cannot withstand the slippage phenomenon of the soil, the reinforcing material easily extends, and the soil layer slips and slips with the reinforcing material, It will collapse.

When the same performance as the warp direction is required in the weft direction as a soil structural reinforcing material, the tensile strength in the weft direction is 2000 kg / m or more, and the cutting elongation is 20%.
Hereinafter, the intermediate tensile stress at the time of elongation at 80% of the cutting elongation shall be 65% or more of the tensile cutting strength.

Even in the case where the strength in the weft direction is not so required, the tensile strength in the weft direction needs to be 300 kg / m or more. If the tensile strength in this direction is less than 300 kg / m, there is a risk of cutting or breakage at the time of construction at the construction site, and the reinforcement is easily broken even after construction, and high strength is obtained with the warp. Even so, the reinforcing material itself falls apart, and the intended purpose cannot be achieved.

In the earth reinforcing structure of the present invention, a lattice-shaped woven fabric having projections is covered with a synthetic resin. The synthetic resin used for the coating is not particularly limited. For example, a resin such as a vinyl chloride resin, an acrylic resin, an epoxy resin, a lipoxy resin, a vinyl ester resin, an unsaturated polyester resin, and a phenol resin is used. Is preferred.
Additives such as curing agents, accelerators, pigments,
Fillers such as talc, clay, gypsum, and calcium carbonate may be mixed and used as necessary.

In the present invention, the method for impregnating the lattice-shaped woven fabric with the synthetic resin is not particularly limited. For example, means such as dipping, coating, spraying, and painting can be used. May be used.

The soil structure reinforcing material of the present invention obtained as described above has a large resistance to pulling out into the soil. Therefore, by laying the soil structure in the soil at an appropriate length, interval, and frequency, the ground supporting force can be improved. It is possible to prevent soil slip phenomenon and prevent uneven settlement of the ground, and to improve the durability of earth structures by several steps, and to prevent collapse and ensure safety. To contribute.

[0026]

According to the present invention, the strength, which is the most required performance for preventing the slip phenomenon required for reinforcing the earth structure, is attained by using a filament yarn of 500 denier or more and a strength of 8 g / d or more. The strength in both the warp and weft directions or the warp direction is 2,000 kg / m or more and the breaking elongation is 8
Intermediate tensile stress at 0% elongation is 65% or more of the cutting strength, and high strength. In addition, regarding the elongation, since the filament elongation with the elongation at break of 15% or less is used, the elongation at break of the reinforcing material is at most 20%, and the intermediate tensile stress at the time of elongation at 80% of the elongation at break is 65% of the cutting strength. % Or more, high strength and low elongation, and can firmly support the ground and embankment of earth structures.

Further, the reinforcing material of the present invention has a projection made of a filament yarn of 500 denier or more coated with a synthetic resin having a height of 1 to 30 mm at at least a part of intersections of the lattice-shaped woven fabric. Therefore, when laid in a soil structure, the pull-out resistance in the soil is significantly improved, the bearing capacity of the ground and embankment can be further increased, and the slippage of the soil can be prevented, and the uneven settlement of the ground can be prevented. Can be prevented.

Further, since the entire surface of the core fiber material is covered with a synthetic resin, the earth structure reinforcing material of the present invention prevents the fiber from being damaged due to damage during construction and reduces the performance. It acts to keep it.

Further, since the reinforcing material of the present invention has a lattice size of 10 to 100 mm, it is suitable for all types of soil used in soil structures, and bridging between the soils and a meshing effect are unfailingly exhibited. Becomes

[0030]

Next, the present invention will be described with reference to examples. The measurement of the performance in the examples was performed as follows.

(1) Yarn strength Measured according to JIS L-1069 (2) Yarn elongation Measured according to JIS L-1069 (3) Tensile breaking strength Measured according to JIS L-1069 and converted to 1 m width (4) Cutting elongation Measured according to JIS L-1069 (5) Pull-out resistance ・ Measurement method The reinforcing material of the present invention is laid in the earth tank of a soil pull-out tester.
The pull-out resistance characteristics are measured.

[0032] Measurement conditions tester Maruhigashi Seisakusho soil pull tester using soil of Toyoura standard sand degree of compaction unit weight 1.525tf / m ² on No圧^{0.2kgf / cm 2, 0.4kgf / cm} 2 and 0.6 kgf / Measured in cm ² Drawing speed 1mm / min Earth tank dimensions 500mm width, 800mm length, 200mm height Sample size 450mm width, 500mm length Example 1 1200d / 250f as ground warp and ground weft on both sides
A total of 3600 denier yarn obtained by twisting three vinylon yarns having a strength of 12 g / d and an elongation of 6% using a polyester yarn of 1500 d / 378f as a connecting yarn.
The soil structure reinforcing material having protrusions on one side in FIG. 1 is drawn into a reed with a reed density of 7.3 birds / whale and three outer surface warps, three lining warps, and two connecting yarns. Open the wings, pull in the warp in this repetition, and use a moquette loom to
As shown in FIG. 5, while weaving at a weft density of 9 / inch in the structure shown in FIG. 6 and weaving a lattice-shaped three-dimensional woven fabric having a warp length of 16 mm, a warp length of 16 mm, and a thickness of 20 mm. Then, the connecting yarn was cut at both sides by a knife to obtain a lattice-shaped woven fabric having a projection on one surface.

The obtained grid-like woven fabric is impregnated with a PVC resin solution having the following composition, and is subjected to a heat treatment at 150 ° C. for 3 minutes. A reinforcement was obtained.

[PVC resin composition] 100 parts of vinyl chloride resin paste resin (Zeon 121, manufactured by Zeon Corporation) 40 parts of dioctyl phthalate (plasticizer) 10 parts of methyl isobutyl ketone / naphthenic thinner 10 parts (diluent, volume ratio: 1/1) Example 2 As a ground warp and a ground weft, a total of 2400 denier yarns in which two vinylon yarns each having 1200d / 250f, strength of 12 g / d and elongation of 6% were twisted, and pile warp was used as a pile warp.
Using polyester yarn of 1500d / 378f, 3 ground warp yarns and 2 pile warp yarns are drawn into a reed with a reed density of 14.5 birds / whale, and 5 empty wings are opened. Using a towel loom, weave at a weft density of 4.5 lines / inch on the lattice-shaped mosaic towel structure shown in FIG. 8, and have a longitudinal mesh of 16 mm, a warp of 16 mm, and a thickness of 20 mm. A lattice pile fabric was woven.

The obtained grid-like pile fabric is subjected to resin processing in the same manner as in Example 1, and the present invention is shown in FIG.
A lattice-shaped soil structure reinforcing material having the following shape was obtained.

Comparative Example 1 A grid-like woven fabric was woven under the same conditions as in Example 2 except that the pile warp was not used, and the same resin processing as in the example was performed to obtain a grid without protrusions. Soil structure reinforcement was obtained.

Table 1 also shows the evaluation results of the earth structure reinforcing materials of Examples 1 and 2 and Comparative Example 1 thus obtained.

[0038]

[Table 1]

As shown in Table 1, Examples 1 and 2
Is a high-strength, low-elongation soil structure reinforcement material, which has extremely excellent pullout resistance in the main direction. On the other hand, Comparative Example 1 is a high-strength, low-elongation soil structure reinforcing material. However, when used as a soil structure reinforcing material, the number of laying steps, the laying length, etc., are required to be large because of low pull-out resistance. I do.

[0040]

The soil structure reinforcing material of the present invention has excellent properties such as high strength, low elongation, and high resistance to pulling out in the soil. By laying at a high frequency, the ground bearing capacity can be greatly improved, preventing the slippage of the soil and preventing uneven settlement of the ground, and improving the durability of the soil structure by several steps. It greatly contributes to preventing collapse and ensuring safety.

[Brief description of the drawings]

FIG. 1 is a schematic view of an earth structure reinforcing material provided with a projection on one surface according to the present invention.

FIG. 2 is a schematic view of an earth structure reinforcing material provided with projections on both surfaces according to the present invention.

FIG. 3 is a cross-sectional perspective view of the earth structure reinforcing material of FIG. 1 according to an example of the present invention, which is cut in a lateral direction.

FIG. 4 is a cross-sectional perspective view of the earth structure reinforcing material of FIG. 2 according to an example of the present invention, which is cut in a lateral direction.

FIG. 5 is a schematic cross-sectional view showing an example in which a lattice-shaped woven fabric having protrusions on one surface is formed by a moquette loom according to the present invention, and both sides are cut by a center cut using a knife.

FIG. 6 is an example of an organization diagram for obtaining a lattice-like woven fabric having projections formed on one side by the moquette loom of the present invention.

FIG. 7 is a schematic cross-sectional view of an example of a lattice-shaped woven fabric having projections formed on both sides by a towel loom of the present invention.

FIG. 8 is a schematic diagram of obtaining a grid-like woven fabric having projections formed on both sides in FIG. 8 by the towel loom of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 earth structure reinforcing material 2 lattice woven fabric 3 synthetic resin 4 ground warp 5 ground weft 6 protrusion 7 front side ground structure 8 back side ground structure 9 connecting yarn 10 cutter knife 11 ground structure 12 loop-shaped protrusion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Reichi Namizama 23 Uji Kozakura, Uji-city, Kyoto Unitika Ltd.In the Central Research Laboratory, Ltd. Central Research Laboratory

Claims (3)

[Claims] 1. A lattice woven fabric having a length of 10 to 100 mm, woven from a filament yarn having a denier of 500 denier or more, a strength of 8 g / d or more and an elongation of 15% or less as a ground warp and a weft. A projection made of filament yarns of 500 denier or more is formed on the intersection of, and the surface of the grid-like woven fabric is covered with synthetic resin. The degree is less than 20% and the elongation at break is 8
An earth structure reinforcing material, wherein the intermediate tensile stress at 0% elongation is 65% or more of the cutting strength. 2. A lattice woven fabric having a denier of 10 to 100 mm, woven as a filament yarn having a denier of not less than 500 denier, a strength of not less than 8 g / d and an elongation of not more than 15%, on at least a part of intersections of one side. A projection made of a filament yarn of 500 denier or more is formed on the surface of the grid-like woven fabric, and the surface of the lattice-shaped woven fabric is covered with a synthetic resin. The tensile strength in the longitudinal direction is 2,000 kg / m or more, and the cutting elongation is 20% or less. The intermediate tensile stress at the time of elongation of 80% of the cutting elongation is 6
An earth structure reinforcing material having a tensile cutting strength in a weft direction of 300 kg / m or more at 5% or more. 3. The height of a projection made of a filament is 1 to 3.
The earth structure reinforcing material according to claim 1 or 2, which is 30 mm.