JPH0211455Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drainage material for civil engineering that is buried in water passageways such as culverts, slopes, tunnels, and the back side of retaining walls of concrete structures.

Traditionally, the above-mentioned drainage materials for civil engineering have a structure in which a porous pine-like material made of bristle fibers bonded and strengthened with resin is covered with a felt-like material. The compressive resistance is not sufficient, and the sustainability of the drainage capacity during long-term use is difficult.In addition, drainage materials with a large cross-sectional area are required in areas with large drainage volumes, and the amount of materials required for this is large, making it uneconomical. We should never be satisfied with this.

The present invention provides a drainage material for civil engineering that has high compressive resistance to earth pressure despite its low apparent density, is superior in terms of drainage performance, and is highly economical. As shown, a large number of continuous synthetic polymer filaments 1, 1 with a diameter of 0.5 to 1.5 m/m each form irregular loops 2, 2 and cross each other to form peaks and valleys. It bends in the thickness direction so that it extends from one side to the other,
The large number of continuous synthetic polymer filaments 1, 1 are bonded at their respective intersections 3, 3, and the surface has a large number of ridge-like peaks 4, 4 extending in a zigzag shape while being bent in an approximately right angle direction. Recessed groove-like valleys 5, 5 are formed between the peaks 4, 4.
4 and troughs 5, 5 are troughs 5A, 5 on the back side.
Porosity 90 formed by forming A and peaks 4A and 4A
% or more of the net-like pine-like structure 6 is cut vertically,
It is characterized in that the lengthwise periphery of the vertical structure is covered with a water-permeable sheet-like material.

More specifically, it is made of a synthetic polymer such as a homopolymer or a copolymer thereof such as polyethylene, polypropylene, polyester, polyamide, etc., and has a diameter of 0.5 to 1.5 m/m. Each of the strips 1, 1 forms irregular loops 2, 2, intersects each other, bends in the thickness direction so as to form peaks and troughs, and extends from one side to the other, and The combined continuous filaments 1, 1 are adhesively bonded at their respective intersections 3, 3, and the surface has a large number of ridge-like peaks 4, 4 extending in a zigzag shape while bending in the right angle direction, and between the peaks 4, 4. Recessed groove-like troughs 5, 5 are formed on the front side, and the ridges 4, 4 and troughs 5, 5 on the front side are similar to the troughs 5A, 5A and ridges 4A, 4 on the back side.
A net-like pine-like structure 6 having a porosity of 90% or more and having substantially the same undulations on both the front side and the back side is cut into a width dimension of 300 m/m and a length dimension of 2000 m/m, for example. The structure 6 was covered with a felt-like water-permeable sheet material 7 having an apparent thickness of about 10 m/m to serve as a drainage material.

The apparent thickness of the above-mentioned net-like pine-like structure 6 is preferably about 20 to 60 m/m, and the covering water-permeable sheet material 7 is made of a natural material with excellent corrosion resistance such as coconut fiber or cocoon fiber. Felts or fabrics made of fibers or synthetic fibers such as polyethylene, polypropylene, polyester, polyamide, or mixtures of these fibers are applied. It is desirable that the mat-like structure 6 and the water-permeable sheet-like material 7 be bonded together by means such as fusion or adhesive.

The above-mentioned network structure in the present invention is produced by spinning a synthetic polymer in a molten state into continuous filaments from a spinneret equipped with a row of spinning holes with a hole diameter of approximately 0.5 to 1.5 m/m.
While the spun filament group is in a molten state, a natural substance is placed on a conveying body having peaks and valleys similar to the structure 6 and moving at a speed lower than the falling speed of the spun filament group. It can be efficiently obtained by a method in which the spun filaments are collected as irregular loops by falling, autofusing at each intersection, and then cooling. In addition, two types of synthetic polymers with different melting points are extruded in a molten state from separate extruders to form the above-mentioned continuous filaments, and the core is formed through a common spinning hole so that at least the low melting point polymer is disposed on the surface of the filaments. It may also be applied with composite continuous filaments spun into a sheath-like or dorsal-ventral shape. When such a composite continuous filament is used and allowed to fall naturally onto a carrier as described above to form a three-dimensional network structure, even if the self-adhesion between the filaments is not sufficient, the bond between the two synthetic polymers By heating the structure at a temperature above the melting point of the low melting point polymer and below the high melting point, the intersections of the filament groups can be firmly bonded. In addition, if the self-adhesive strength of the structure obtained using the single synthetic polymer or its copolymer is insufficient, it is recommended to bond the intersections of the wire groups using an adhesive. .

The height of the peaks 4 of the network structure 6, the length of the linearly extending portions, the cross-sectional shapes of the peaks 4 and valleys 5, the thickness of continuous lines, etc. are determined by the purpose of the structure,
Although it is arbitrarily selected based on the user's request, the height of the peak 4, that is, the apparent thickness, is determined based on the purpose of use as a reinforcement material for soil slopes, a drainage material for soil water, etc. The thickness of the continuous filaments is preferably about 20 to 60 m/m from the viewpoint of the function, and the thickness of the continuous filaments is preferably about 0.5 to 1.5 m/m from the viewpoint of strength and economy. The structure 6 has a bulky pine shape with high rigidity and a porosity of 90% or more, preferably 35% or more.

Further, specific examples and performance of the above-mentioned net-like pine-like structure are as follows.

A hole diameter of 1.0 m /
A copolymer of propylene and a small amount of ethylene was melt-spun using a spinneret having a large number of spinning holes spaced apart from each other to form a self-adhesive three-dimensional network structure having the following form. (See Figure 4) Height of the ridges H...approximately 25m/m Interval between the ridges P...approximately 22m/m Inclination angle of the sides of the ridges A...approximately 80 degrees Bend series shape of the ridges...Figure 3 As shown in the figure, the long part 4B and the short part 4C are bent at right angles and extend in a zigzag shape, and the length of the long part 4B is about 50 m/m, and the length of the short part 4C is about 22 m/m. Thickness of continuous filaments: Diameter: 1.1 m/m Porosity of structure: Approximately 96% Weight of structure: 930 g/m ² Despite the extremely large apparent porosity of this structure, the strain rate is 20%. The load is approximately 6000Kg/m ²
and has high compression resistance.

Note that the porosity was calculated using the following formula.

Porosity % = 1000000 - weight of structure g
/ m ³ / Specific gravity of linear material / 1000000 x 100 By the way, in a porous mat-like structure with a porosity of about 94% made by randomly molding continuous filaments of the same synthetic polymer as above, the specific gravity is about 2000 Kg/m ² The strain rate exceeded 20% under the load of .

The water-permeable sheet material 7 covering the net-like pine-like structure 6 is made by spreading the above-mentioned corrosion-resistant fibers into a sheet shape and then reinforcing it by resin impregnation, needle punching, or other methods. Alternatively, a nonwoven fabric sheet obtained by a spunbond method is suitable.

As detailed above, the drainage material for civil engineering according to the present invention is economical because the interior material that constitutes its core is composed of a three-dimensional net-like structure, and the apparent density per unit volume is small. It is rich in water-permeable voids, and has a large number of ridge-shaped peaks that extend in a zigzag shape almost at right angles, so it has a network structure with a high porosity, but has high compression resistance against earth pressure. Therefore, if a civil engineering drainage material made by cutting a net-like structure with high porosity and compression resistance into lengthwise lengths and covering the lengthwise periphery with a water-permeable sheet is buried in the soil, rainwater and spring water will be removed. etc., penetrate into the net-like structure from around the drainage material through the water-permeable sheet, and are smoothly drained through the gap passages formed by the structure.
Furthermore, there is no intrusion of earth and sand into the structure from the surrounding area, and the water passages are not reduced in size, so good drainage function can be maintained for a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and
Fig. 1 is a perspective view of a net-like pine-like structure, Fig. 2 is a partial cross-sectional perspective view of a drainage material, Fig. 3 is a simplified plan view showing the surface peaks of the pine-like structure with broken lines, and Fig. The figure is a side view schematically showing the cross-sectional shape of the pine-like structure in the thickness direction. 1 is a synthetic polymer continuous filament, 2 is a loop, 3 is an intersection, 4 is a peak, 5 is a valley, 4A and 5A are peaks and valleys on the back side, 6 is a pine-like structure, 7
is a water-permeable sheet material.

Claims (1)

[Scope of utility model registration request] A large number of continuous synthetic polymer filaments each having a diameter of 0.5 to 1.5 m/m form irregular loops and intersect with each other, bending in the thickness direction to form peaks and troughs. The large number of continuous synthetic polymer filaments are bonded to each other at their respective intersections, and the surface has a large number of ridge-like peaks extending in a zigzag shape while bending in a substantially right angle direction, and between the peaks. A reticulated pine-like structure with a porosity of 90% or more, which is formed by forming valleys and peaks on the back side, is cut into lengthwise lengths. A drainage material for civil engineering, characterized in that the lengthwise periphery of the structure is covered with a water-permeable sheet material.