JPH10311036A - Sheet for civil engineering construction and method for laying the sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet for civil engineering construction and a method for laying such sheets, whereby an excellent reinforcing effect in the weft direction is ensured. SOLUTION: A sheet for civil engineering construction works in lattice form consisting of a number of warps (a) in groups and a number of wefts (b) in groups is covered with a certain material such as resin, rubber, or bitumen. Each group of warps (a) is formed from a plurality of warps in parallel arrangement where the distance between the warp groups (a) is over 5 mm, while each group of wefts (b) consists of a plurality of wefts in parallel arrangement where the distance between the weft groups is over 5 mm, and the intersection strength/tensile strength in the weft direction is over 0.06.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet and a laying method for civil engineering and construction used in a method of reinforcing a ground, a method of treating a ground, a method of laying a net, a method of reinforcing an embankment, and a method of reinforcing a reinforced earth wall.

[0002]

2. Description of the Related Art Sheets for civil engineering and construction are widely used in, for example, embankment construction methods. In this case, the sheet is integrated with the soil and the like to suppress the slip of the reinforced embankment, to reduce deformation as much as possible and to achieve stability. Plays. When an arc slide occurs on the reinforced embankment, a shear force is applied and the sheet is easily pulled out of the soil. To prevent this, the sheet expresses a sufficient frictional resistance to the soil, that is, a high tensile strength. And a sufficient intersection strength. Conventionally,
BACKGROUND ART There is known a civil engineering construction sheet in which a knitted fabric in which yarn groups are linearly structured, for example, a knitted fabric based on a Russell warp knitting structure is coated with a resin such as polyvinyl chloride or acrylic resin.

[0003]

A general Russell warp knitting structure is a warp yarn in which other yarns are linearly knitted in each knit of the ground knitting yarn, and a knitting linearly knitted into the warp yarn. It is composed of a weft. Therefore, although having sufficient mechanical strength in the warp direction, there is a problem in that the weft is easily pulled out because only the weft is inserted between the knitting yarns and the intersection strength in the weft direction is insufficient. . Therefore, when the embankment reinforcement method is performed, it is necessary to cut the sheet into an appropriate length and join the sheet so that the warp direction is the direction to which a load is applied, which is disadvantageous in terms of processability and cost. (See FIG. 1).
SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a sheet for civil engineering and construction and a method for laying the sheet in which the reinforcing effect in the weft direction is excellent.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a sheet for civil engineering construction comprising a lattice-like sheet comprising a number of warp groups and a number of weft groups coated with a resin, rubber or bituminous material. The warp group is constituted by a plurality of warps arranged in parallel, the distance between the warp groups is 5 mm or more, and the weft group is constituted by a plurality of wefts arranged in parallel, the distance between the weft groups. Is not less than 5 mm and the intersection strength / tensile strength in the weft direction is not less than 0.06, and a grid-like sheet comprising a large number of warp groups and a large number of weft groups. A civil engineering construction sheet coated with resin, rubber or a bituminous material, wherein the warp group is constituted by a plurality of warps arranged in parallel, the distance between the warp groups is 5 mm or more, and The plurality of wefts in which the weft group is arranged in parallel Ri is configured, the distance between the weft groups 5m
m or more, and an intersection strength / tensile strength in the weft direction is 0.06 or more, and a sheet for civil engineering and construction is laid in a state where a load equal to or more than that in the longitudinal direction is applied in the weft direction. About.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The sheet of the present invention has an intersection strength / tensile strength of 0.06 or more in the weft direction, preferably 0.1 mm or more.
10 or more. If the value is too low, the frictional resistance of the sheet becomes low, and it is necessary to lengthen the laying length, resulting in inefficiency in cost and workability. In particular, in the embankment reinforcing method, it is difficult to use the sheet as it is without processing it. The intersection strength in the latitude and longitude directions is 8
kg or more, particularly preferably 10 kg or more, and the tensile strength is 2 kg or more.
It is preferably at least 000 kg / m, particularly preferably at least 4000 kg / m. The tensile strength in the weft direction in the present invention is defined as a × n, where n is the number of weft groups per 1 m width and akg is the tensile strength of any one weft group.
And the intersection strength in the weft direction referred to in the present invention is the number of intersections (per 1 m of the weft group) in one weft group with the warp group and m when one arbitrary weft group is pulled out. It is a value represented by b × m when the drawing strength is bkg.

[0006] The fabric used in the present invention is composed of a number of warp groups and a number of weft groups. The number of the warp groups and the weft groups constituting the sheet may be appropriately set, but is preferably 10 or more, particularly 20 or more, each per 1 m width. The warp group is composed of a plurality of warps arranged in parallel, and the number of warp yarns constituting one warp group is 2 to 10 from the viewpoint of intersecting strength and interlocking with a matrix such as soil. Is preferred. The weft group referred to in the present invention is a group in which a plurality of wefts are arranged in parallel, and the number of the wefts constituting one weft group is determined from the viewpoint of intersecting strength and interlocking with a matrix such as soil. Two
Ten are preferred.

When used in the embankment reinforcing method, the distance between the warp groups and the distance between the weft groups are 5 mm or more, preferably 10 to 20 in terms of interlocking of soil and the like.
0 mm. The distance between the warp groups and the distance between the weft groups in the present invention are formed between the warp group (the weft group) and the warp group (the weft group) adjacent to the warp group (the weft group). The length of the gap is shown (see FIG. 2). The opening area of the cloth is preferably about ²⁰ to 5000 mm ² , particularly about 25 to 500 mm. The term “opening area” as used in the present invention refers to the area of the opening formed by the adjacent warp group and weft group. Note that the warp group and the weft group referred to in the present invention refer to a plurality of warps or wefts that are converged and integrated by resin, rubber, or bituminous material, and include those in which cracks are partially generated. . That is, there is no gap between the warps (between the wefts) where the coating material such as resin does not substantially exist, and between the warp groups (between the weft groups) where the coating material such as the resin does not substantially exist. Is distinguished between the warp group (weft group) and the warp (weft).

In the sheet of the present invention, it is preferable that the wefts crossing the warps are bound by yarns, and it is more preferable that the wefts crossing each of the warps are bound by tangling yarns one by one. . By employing such a configuration, a high intersection strength can be achieved. Specifically, on the basis of a warp knitting structure such as Russell, a group of warp yarns including yarns running in a substantially straight line in the warp direction and a group of warp yarns located in a substantially straight line in the weft direction are combined in a lattice pattern to form a warp Preferably, the weft constituting the weft group is divided into a plurality of yarns (preferably one by one) and joined together.

The conventional warp knitting structure such as Russell has a problem that the weft easily comes off from the warp. However, the warp group and the weft group are formed of a plurality of warps and wefts to increase the binding force at the intersections and intersect with each warp. By sufficiently fixing the weft at the intersection, the reinforcing effect in the weft direction can be significantly improved. In terms of the intersection strength, the number of bonds is preferably 4 or more, particularly preferably 6 or more. The number of connections in the present invention refers to the number of divided sections when the warp group and the weft group are divided and connected by yarn. For example, in FIG.
In FIG. 3B, the number is four, and in FIG. 3, the number of weft yarns is three because two weft yarns are combined together. It is preferable to use a yarn equivalent to 500 d or less, particularly 100 to 300 d, for the yarn used for bonding.

A specific example of a preferable fabric structure is 50
A warp group composed of a warp yarn in which a yarn having a thickness of 1000 to 10000d is woven in a straight line in a warp direction with respect to a stitch of a knitting yarn equivalent to 0 d or less, and a weft direction substantially linearly in the warp group; A weft group consisting of wefts having a thickness equivalent to 3000 to 15000 d which are knitted and inserted into the knitted fabric, and each of the wefts is inserted one by one into the knitting of the ground knitting yarn (entangled yarn) to form an integrated fabric. No. The ground knitting yarn is preferably formed of a plurality of chain stitches. Each of the chain yarns may be connected by a binding yarn. Further, it is preferable that the number of the warps constituting the warp group is increased at the ear portion to form a belt shape.

The fibers constituting the fabric are not particularly limited. For example, polyester fibers (including polyarylate), polyvinyl alcohol fibers, polyamide fibers,
Organic synthetic fibers such as aramid fibers, acrylic fibers, and polyolefin fibers (polypropylene, polyethylene, etc.), and inorganic fibers such as glass fibers. As appropriate
It may contain titanium oxide, kaolin, silica, barium sulfate, carbon black, pigments, antioxidants, ultraviolet absorbers, light stabilizers and the like. The form of the yarn constituting the fabric may be any of a filament and a spun yarn, but a filament yarn is particularly preferable. Filament yarns are higher in strength than spun yarns, and are preferable from the viewpoint of antifouling properties because they have no fiber fluff on the surface. The warp and weft thickness is 5
The total denier of the warp group and the weft group is preferably 40 to 30,000 d, particularly preferably 2,000 to 15,000 d.
It is preferably at least 00d, particularly preferably 5000 to 100000d. Several multifilaments 10 to 200t
Those twisted about / 10 cm can be suitably used as warp and / or weft.

A desired sheet can be obtained by coating such a fabric with one or a combination of resin, rubber and bituminous material. The type of these coating agents is not particularly limited. For example, polyester resins, polyurethane resins, polyvinyl alcohol resins, polyamide resins,
Acrylic resins, polyvinyl chloride resins, epoxy resins, polyvinyl acetate resins, rubbers such as natural rubber and styrene rubber, and bituminous materials such as asphalt. In addition, additives such as a flameproofing agent, an antifouling agent, a water repellent, an oil repellent, an antioxidant, an ultraviolet absorber, a light stabilizer, and a pigment may be added to these coating materials.

Preferably, these substances are applied as emulsions, solutions, organosols, plastisols or melts. The method is not particularly limited, but an impregnation method, a coating method, or the like is preferable. From the viewpoints of form stability, mechanical strength, handleability, and the like, the coating amount of the coating agent is 2 to 30.
It is preferred to be 0% by weight / fiber cloth, especially 50 to 200% by weight / fiber cloth. The basis weight is 500 g / m ² or less, especially 100
It is preferably about 400 g / m ² .

Since the sheet of the present invention has excellent mechanical strength not only in the warp direction but also in the weft direction, the embankment is not cut and joined as in the conventional method shown in FIG. It can be used for reinforcement methods. From the above, in the present invention, since the sheet can be used as it is without considering the construction direction, the applicable range can be further expanded by increasing the sheet width, and a remarkable effect can be obtained. More specifically, the sheet width can be increased by using a wide tenter. When used in the embankment reinforcement method, a particularly remarkable effect is obtained by setting the width in accordance with the required laying length of the embankment, and the embankment can be suitably used in the embankment reinforcement method for railways and the like. When used for the embankment reinforcement method for railway tracks, it is preferable that the length (width) in the weft direction be about 3 to 5 m. Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples.

[0015]

【Example】

[Intersection strength] With respect to one intersection portion, both ends of the warp sandwiching the weft are fixed, and the pulling strength (intersection strength) bkg when the weft is pulled out is measured, and one weft group ( 1m
) Was multiplied by the number m of intersections with the warp group to calculate the intersection strength in the weft direction. The same operation was performed for the longitudinal direction, and the intersection strength in the longitudinal direction was determined. [Tensile strength] Both ends of one weft group constituting a sheet grid are fixed (distance between fixings: 40 cm), and a tensile test (tensile speed: 5% / min) is performed to determine the strength at break (tensile strength ak).
g) was measured, and the intersection point strength in the weft direction was calculated by multiplying the value a by the number n of weft groups per 1 m width. The same operation was performed for the warp direction, and the tensile strength in the warp direction was determined.

Example 1 1200 d / 60 as warp
0f vinylon filament (550 Kuraray Co., Ltd.)
6), and a twist of 80 t / 10 cm was added.
Three 400d yarns (7200d total denier) were produced. As weft yarns, four 1,800-denier / 600-f vinylon filaments (Kuraray Co., Ltd., 5506) were combined, and two 80-t / 10-cm twisted 4800-d yarns (9600-d total denier) were produced. 25 for knitting yarn
Using 0 denier polyester filament yarn, 3
The two warps are inserted in a straight line so that one weft is inserted into one of the knitting threads of the warp, and the distance between the warp groups is 16 m.
A knitted fabric having a Russell warp knitting structure having a length of 18 mm and a distance between the weft groups of 18 mm (see FIG. 2A) was knitted. An acrylic resin (trade name: Clothren, manufactured by Takeda Pharmaceutical Co., Ltd.) was used for the knitted fabric, and the resin was impregnated with the resin so as to have a resin adhesion amount of 130% by weight / knitted fabric to produce a sheet. Table 1 shows the results.

[Example 2] As warp, 1200d / 6
Two 3600d yarns (total denier: 7200d) obtained by combining three 00f vinylon filaments (Kuraray Co., Ltd., brand 5506) and twisting 80t / 10cm.
Was manufactured. 1200 denier / 600f as weft
80t / 10 with four vinylon filaments
cm 4 twisted 4800d yarns (total denier 9
600d). A 250-denier polyester filament yarn is used as a knitting yarn, and two warps are arranged in parallel and woven in a straight line. A weft is inserted into one knit of the knitting yarn. The weft of this book is inserted in a straight line, the distance between the warp groups is 16 mm, and the distance between the weft groups is 1
An 8 mm Russell warp knitted fabric (see FIG. 2B) was knitted. Acrylic resin (product name: Crosslen, manufactured by Takeda Pharmaceutical Co., Ltd.) was used for the knitted fabric, and the resin adhesion amount was 1
The sheet was impregnated so as to be 30% by weight / knitted fabric to produce a sheet. Table 1 shows the results.

Comparative Example 1 1200d / 60 as warp
0f vinylon filament (550 Kuraray Co., Ltd.)
6), and a twist of 80 t / 10 cm was added.
Three 400d yarns (7200d total denier) were produced. As the weft, two 4800d yarns (total denier 9600) with four 1200 denier / 600f vinylon filaments and 80 t / 10 cm twisted together
d) was prepared. Using a 250 denier polyester filament yarn as the knitting yarn, three warps are arranged in parallel and woven in a straight line, and two wefts are inserted into one knitting of the knitting yarn at a time, and the warp is inserted. Distance between groups 16mm,
A knitted fabric having a Russell warp knitting structure having a distance between the weft groups of 18 mm (see FIG. 3) was knitted. A sheet was produced by impregnating the knitted fabric with an acrylic resin (trade name: Clothren, manufactured by Takeda Pharmaceutical Co., Ltd.) so that the resin adhesion amount was 130% by weight / knitted fabric. Table 1 shows the results.

[0019]

[Table 1]

[0020]

The civil engineering construction sheet of the present invention is excellent in the reinforcing effect in the weft direction and can be laid without considering the laying direction, so that the work can be performed easily and efficiently.

[Brief description of the drawings]

FIG. 1 is a simplified diagram showing a method of manufacturing a sheet used in a conventional embankment reinforcing method and the like.

FIG. 2 is a schematic diagram showing a structure of a civil engineering building sheet used in an embodiment of the present invention.

FIG. 3 is a schematic view showing the structure of a civil engineering building sheet used in a comparative example of the present invention.

[Description of Symbols] a is a warp group, 1a, 2a, 3a are warp yarns, b is a weft group, 1
b and 2b are weft yarns, 1c, 2c and 3c are tangled yarns (knitting yarns), d is between warp groups, and e is between weft groups.

Claims (2)

[Claims] 1. A sheet for civil engineering construction comprising a lattice-like sheet comprising a number of warp groups and a number of weft groups coated with a resin, rubber or bituminous material, wherein the warp groups are arranged in parallel. And the distance between the warp groups is 5
mm or more, and the weft group is composed of a plurality of wefts arranged in parallel, the distance between the weft groups is 5 mm or more, and the intersection strength / tensile strength in the weft direction is 0.06 or more. Civil engineering architectural sheet. 2. A sheet for civil engineering construction comprising a lattice-like sheet comprising a number of warp groups and a number of weft groups coated with a resin, rubber or bituminous material, said warp groups being arranged in parallel. And the distance between the warp groups is 5
Civil engineering construction in which the weft groups are arranged in parallel, the distance between the weft groups is 5 mm or more, and the intersection strength / tensile strength in the weft direction is 0.06 or more. A method of laying in a state where a load equal to or greater than that in the warp direction is applied in the weft direction using a sheet for use.