JP3134983B2 - Drainage material for ground stabilization - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground stabilizing drainage material.

[0002]

2. Description of the Related Art For example, in the case of embankment, in order to prevent a landslide or the like, a net-like material, a nonwoven fabric, or a drainage material in which these are combined is buried in the embankment to drain water in the embankment. Was. However, these conventional drainage materials do not have sufficient drainage properties.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a ground stabilizing drainage material having excellent drainage properties.

[0004]

The ground stabilizing drainage material according to the present invention is composed of a fibrous web and a fibrous web arranged substantially in one direction, and the fibrous bundle comprises a monofilament.
Collect about 0-500, fineness 100-5,000 denier
And a multifilament bundle . In addition, the thread-like bundle arranged in approximately one direction and the fiber web are integrated.
When the fiber web has a coarse-dense structure, and the fibrous bundle is integrated with the rough structure surface of the fiber web, the resistance at the time of water permeation is small, so that the water permeability is excellent, and It is a drainage material for ground stabilization, because the coarse layer acts as a buffer layer during construction and the like, so that the thread-like bundle is hardly damaged.

[0005]

The drainage material for stabilizing the ground (hereinafter referred to as "drainage material") of the present invention is a wastewater containing net-like material because the fiber bundle and the fiber web arranged in substantially one direction are integrated. Compared to the drainage material, the drainage direction is clearer, that is, the drainage material including the net-like material easily moves water in the vertical and horizontal directions, whereas the drainage material of the present invention has a thread-like bundle. They are arranged in almost one direction, and water is easy to move in almost one direction, so they have excellent drainage. In addition, in order to further enhance drainage, it is preferable to shorten the interval between the thread bundles. However, in the present invention, since the filament bundles are arranged in only one direction and need not be woven, the interval between the filament bundles can be shortened, and a drainage material having more excellent drainage properties can be obtained. .

Examples of the filamentous bundle of the present invention include a multifilament bundle in which a plurality of monofilaments are collected, a multifilament yarn in which the multifilament bundle is twisted, and a spinning in which short fibers are twisted after being aligned. A thread or the like can be used. Among them, the multifilament bundle can be preferably used because it can be easily integrated with the fiber web by a needle punch method or the like. As this multifilament bundle, a monofilament is 50 to 50
Those obtained by collecting about 0 fibers and having a fineness of 100 to 5,000 denier can be suitably used. If the fineness is less than 100 denier, the drainage material is stretched and the embankment is easily broken. 000 denier.

The fibers constituting the thread-like bundle include, for example, polyamide, polyvinyl alcohol, polyvinyl chloride, polyester, polyacrylonitrile, and the like.
Synthetic fibers such as polyolefins such as polyethylene and polypropylene, regenerated cellulose fibers, semi-synthetic fibers such as cellulose fibers, inorganic fibers such as carbon fibers, plant fibers such as cotton and hemp, and animal fibers such as silk and wool alone. Or in combination. Among them, polyester fibers are preferably used because they have a high coefficient of friction, do not shift during construction, and are easily integrated with the fiber web. The fibers constituting the thread-like bundle preferably have an elongation of 20% or less so that the fibers do not expand and break the embankment. The elongation refers to a value measured by a method for measuring tensile strength and elongation specified in 7.5 of JIS L- ^1013-1992 .

In order to hold and reinforce such a thread bundle and enhance drainage, the thread bundle is integrated with the fiber web. As the fiber web, for example, one formed by a dry method such as a card method or an air lay method, a wet method, a direct method such as a spun bond method or a melt blow method can be used. Among them, the dry method, particularly the card method, is a suitable method for forming a fiber web because the fiber selection is wide and a fiber web excellent in strength is easily formed. In addition,
A fiber web having a sparse-dense structure can be suitably used because it reduces the resistance at the time of water permeation to make it more excellent in water permeation, or acts as a buffer layer at the time of construction or the like and makes it difficult to damage the filamentous bundle. For example, the fiber web having the coarse-dense structure is formed by laminating a fiber web formed by a dry method and a fiber web formed by a wet method, laminating fiber webs having different fiber lengths, or laminating fiber webs having different finenesses. Or a combination thereof. Among these, a method of laminating fiber webs having different finenesses is preferable because a fiber web having a dense structure can be easily formed.

As the fibers constituting the fiber web, the same fibers as the fibers constituting the filamentous bundle can be used alone or in a blended form. Among them, polyester fibers are excellent in buffering property and thus damaged. Polyvinyl alcohol fibers are preferably used because they are hydrophilic and have excellent drainage properties. The fineness of the fiber constituting the fiber web is preferably 1 denier or more so that clogging by soil is unlikely to occur, and is preferably 30 denier or less so as to be easily integrated with the filamentous bundle. The preferred fineness is 2 to 20 denier. Further, the basis weight of the fiber web is preferably 50 g / m ² or more so as to be excellent in buffering property, and 1,000 g so as to be easily integrated with the filamentous bundle.
/ m ² or less, and a more preferable basis weight is 10
0 to 500 g / m ² .

[0010] Such a fiber web and a thread-like bundle are laminated and integrated to obtain a drainage material. In the case of lamination of the fiber web and the thread-like bundle, the thread-like bundle may be laminated only on one surface of the fiber web. The fiber bundle may be laminated on both sides of the fiber web, or the fiber bundle may be laminated between two or more fiber webs (with or without laminating the fiber bundle on the surface layer fiber web). good). As described above, when the fiber web has a coarse-dense structure, it is preferable to stack a thread-like bundle on the rough structure surface of the fiber web. The thread bundles are preferably laminated at an interval of 5 to 100 pieces / inch. If it is less than 5 fibers / inch, drainage is poor, and if it exceeds 100 fibers / inch, it becomes difficult to integrate with the fiber web.
Laminate at intervals of 〜50 / inch. The thread bundles may be arranged in substantially one direction, and need not be arranged at equal intervals.

As a method of integrating the fiber web and the filament bundle, for example, a entanglement method using a needle or a water stream, a bonding method using an adhesive, a method utilizing the heat fusion property of the fiber web and / or the filament bundle, Alternatively, there is a method in which these methods are used in combination. Among them, the entanglement method using a needle or a water flow is preferable because the entanglement method using a needle or a water stream can be integrated without impairing the drainage property with a fibrous bundle or a fiber web. It is particularly suitable because it can be integrated with the bundle. When entangled with this needle, so that the thread-like bundle and the fiber web do not peel off,
The entanglement is preferably performed at a needle density of 50 needles / cm ² or more, and is preferably performed at a needle density of 500 needles / cm ² or less so as not to damage the filamentous bundle.
Entangled at 00 strands / cm ² .

Since the drainage material thus obtained has excellent drainage properties, it can be suitably used for ground stabilization applications such as embankment, soft ground, roads, railway boards, earth retaining walls, retaining walls, and the like. .

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments. The permeability coefficient is based on the permeability test method JIS A ^1218-1990 .
It is a measured value.

[0014]

EXAMPLE by spreading (Example 1) fineness 6 denier, carding machine polyester fibers of fiber length 64 mm, unidirectional, to obtain a fiber web having a basis weight 300 g / m ^2. One side of this fiber web has an elongation of 15.2
% Polyester filament was collected from 1,1,
After stacking a multifilament bundle of 500 denier in the same direction as the orientation direction of the fiber web at an equal interval of 36 pieces / inch, the pieces were integrated by needle punching at a needle density of 150 pieces / cm ² to obtain a drainage material. . The permeability of this drainage material is 3.0
× 10 ^-1 cm / sec.

(Example 2) A unidirectional dense fiber web having a basis weight of 100 g / m ² and a denier of 6 denier, obtained by opening a vinylon fiber having a fineness of 3 denier and a fiber length of 51 mm with a carding machine. 40% by weight of 64 mm polyester fiber, 15 denier fineness, 64 fiber length
The polyester fiber was mixed with 60% by weight of a polyester fiber of 60 mm and opened with a carding machine. The unidirectional crude fiber web having a basis weight of 200 g / m ² was laminated to obtain a laminated fiber web. After the same multifilament bundle as in Example 1 was laminated on the coarse fiber web of this laminated fiber web in the same direction as the orientation direction of the coarse fiber web at equal intervals of 36 filaments / inch, the needle density was 15%.
Needle punching was performed at 0 needles / cm ² , and integrated to obtain a drainage material. The water permeability of this drainage material was 5.0 × 10 ⁻¹ cm / sec.

(Comparative Example) A fiber web obtained in the same manner as in Example 1 was laminated on one surface with a net obtained by plain weaving a polyethylene monofilament having a diameter of 0.4 mm (denier: 1,074 denier) at 11 filaments / inch. In the same manner as in Example 1, needle punching and integration were performed to obtain a drainage material. The permeability of this drainage material is 1.0
× 10 ^-1 cm / sec. In this drainage material, the fiber web and the net were easily separated from each other, and the net was damaged by the needle.

[0017]

According to the drainage material for ground stabilization of the present invention, a thread-like bundle arranged substantially in one direction and a fiber web are integrated .
And the thread bundle has about 50 to 500 monofilaments.
Mulch with a fineness of 100 to 5,000 denier
Since it consists of a filament bundle, it has excellent drainage properties. In addition, the thread-like bundle arranged in approximately one direction and the fiber web are integrated.
When the fibrous web has a coarse-dense structure, and the fibrous bundle is integrated with the rough structure surface of the fibrous web, the resistance at the time of water permeation is small, so that the fiber web is more excellent in water permeability. It is a drainage material for ground stabilization, because the coarse layer acts as a buffer layer during construction and the like, so that the thread-like bundle is hardly damaged.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) E02D 3/00 E02D 3/10 E02D 17/18

Claims (2)

(57) [Claims] A fibrous web arranged substantially in one direction and a fibrous web are integrated with each other, and the fibrous bundle is monofilament.
50 to 500 bottles, fineness 100 to 5,000
A ground stabilizing drainage material characterized by comprising a denier multifilament bundle . 2. A fiber bundle arranged substantially in one direction and a fiber web.
And a fibrous web having a coarse-dense structure, and a fibrous bundle integrated with a rough structure surface of the fibrous web .