JPH04119827U - Drainage material for civil engineering - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the intrusion of earth and sand from both ends of thin long drainage materials. [Structure] A mesh base (1) with a large porosity that serves as a water passage is formed by an irregular network core material of many continuous synthetic polymer filaments (5) with a diameter of 0.5 to 1.5 mm. Both ends of the net-like base (1) are made of high-density material with a lower porosity than the net-like base (1), and water-permeable nonwoven fabric sheets are placed on the front and back surfaces.
(3) and (4) were pasted together, and both edges of the net-like core material of the drainage material (6) were made up of high-density parts (2) and (2) to prevent the intrusion of earth and sand. [Effect] Manufacturing cost is low. It also has pressure resistance and prevents dirt from entering from the sides, so it maintains its excellent drainage function over a long period of time.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is suitable as a drainage material for civil engineering works, specifically for drainage of developed land and grounds. This invention relates to a suitable sheet-shaped drainage material for civil engineering.

0002

[Conventional technology]

In the field of civil engineering, for example, when creating new land, how to remove moisture contained in the soil such as rainfall, compacted water, and spring water is extremely important in preventing landslides such as arcuate slides. being watched. Nonwoven fabrics are commonly used as sheet-like drainage materials for such uses, and needle-punched nonwoven fabrics with a basis weight of 200 to 500 g/m ² are particularly preferred. However, nonwoven fabric sheets have the disadvantage of being condensed due to earth pressure, resulting in a decrease in water permeability. Drainage materials with water channels formed in them are now attracting attention.

0003

[Problems that the idea should solve]

However, the above-mentioned JP-A-59-141620 and JP-A-60-10012 The drainage material described in the publication is a material with excellent durability and long-lasting functionality. Although it can be highly praised as an imaginative sheet-like drainage material, on the other hand, the material cost and production cost are low. It is inevitable that strikes will increase and construction costs will rise significantly, and the industry will There is a strong demand for inexpensive drainage materials with excellent sustainability of water function.

0004 In order to meet this demand, the inventors of the present invention found in Japanese Utility Model Application No. 63-95737. As shown in the figure, water-permeable nonwoven fabric is pasted on both sides of a mesh core material with an apparent thickness of 10 mm or less. Although this drainage material has excellent durability, it has a mesh core material. Because the porosity of both ends is large, it is easy for earth and sand to enter from the edges; It has the disadvantage that the water flow width becomes narrower. The purpose of this invention is to provide an inexpensive drainage material for civil engineering that has improved the above-mentioned difficulties. This is what we are doing.

[0005]

[Means to solve the problem]

The present invention is based on a water passageway as described in the above-mentioned Japanese Utility Model Publication No. 63-95737. Sheet-type soil made by pasting water-permeable sheets on the front and back sides of the core material that forms the soil. The above-mentioned drawbacks were improved by increasing the density of both ends of the core material of the wooden drainage material.

[0006] That is, the drainage material for civil engineering of the present invention consists of a large number of continuous synthetic polymers with a diameter of 0.5 to 1.5 mm. Each of the filaments is irregularly bent, extends in the longitudinal direction while intersecting each other, and each A net-like base with a high porosity bonded at the intersection of the A large number of continuous synthetic polymer wires are formed at both ends and have a smaller porosity than the network base. A long net-like core material is formed by the high-density part of the strips, and a thin It is characterized by having water-permeable nonwoven fabric sheets bonded together.

[0007] Such a drainage material is made of a large number of continuous synthetic polymer filaments extruded from a melt spinning machine, each having a diameter of 0.5 to 1.5 mm, each irregularly bent and intersecting with each other in the longitudinal direction. a net-like base with a high porosity and bonded at each intersection, and a large number of continuous filaments of synthetic polymer having a smaller porosity than the net-like base and spaced apart in the width direction of the net-like base in parallel. On the front and back sides of ^a wide net-like core material formed by a narrow high-density part where It can be easily obtained by making a raw material by laminating 0.08 g of thin water-permeable nonwoven fabric sheets and cutting it along the line of the high-density part.

[0008] Synthetic polymers constituting the above-mentioned reticulated core material include polypropylene, polyamide, Single melt or composite melt of two or more thermoplastic synthetic polymers such as polyethylene However, considering the manufacturing cost, polypropylene with a relatively low melting point can be used. Pyrene and polyethylene are convenient. In addition, the porosity of the network base is 80 to 95. %, the apparent thickness is 10 mm or less, preferably about 3 to 7 mm, for flexibility and pressure resistance. It is advantageous in terms of durability, and if the apparent thickness is greater than 10 mm, it will be damaged by earth pressure. Not only is it easy to compress and deform, but its rigidity also increases, making it difficult to wind it into a roll. Ru.

[0009] In addition, during manufacturing, the high-density parts arranged parallel to the above net-like base at intervals are A porosity of 20 to 85%, preferably 30 to 75% is advantageous in terms of flexibility. Ru. If it is less than 20%, the rigidity becomes large and it becomes difficult to wind it into a roll. If it is larger than %, the sealing condition will deteriorate. In addition, the width of the high-density part is 10 to 30 mm, Preferably it is 15 to 25 mm. If it is less than 10mm, it will be long along the center line of the high density area. If the material is cut in the hand direction, the width of the high-density portion becomes smaller and the sealing performance deteriorates. 30mm The larger the size, the greater the rigidity and the difficulty in winding it up into a roll.

[0010] As the water-permeable nonwoven fabric sheet to be attached to the front and back sides of the reticulated core material, a nonwoven fabric sheet containing thermoplastic fibers, particularly a thin nonwoven fabric sheet containing thermoplastic fibers with a basis weight of about 30 to 150 g/m ² is suitable. It is. The net-like core material in which a net-like base and a high-density portion are formed by the continuous filaments of the synthetic polymer and the nonwoven fabric sheet are bonded together at a part of the net-like base and the high-density portion, and the net-like core material between the nonwoven fabric sheets An effective water passage gap is formed by this.

[0011]

[Effect]

When the drainage material of this invention is laid in the soil, the net-like base is formed between the non-woven sheets in a longitudinal direction. The non-woven fabric sheets on the front and back absorb moisture in the soil using a net-like base. The soil is introduced into the voids formed by the Continuously drains moisture from the soil. Also, the high-density area is located at the cut edge of the sheet of drainage material. This prevents the deterioration of drainage function due to the inflow of soil and sand, and ensures effective drainage function. The pressure resistance of the reticulated core material ensures water-permeable voids for a long time, and the non-woven fabric sheet Water is allowed to flow toward the water passage gap while preventing sediment from flowing into the water passage gap.

0012

【Example】

FIG. 1 shows a partially cutaway perspective view of the drainage material of the present invention, and FIG. 2 shows a cross-sectional view in the width direction. In the figure, (1) is the net-like base, (2) is the high-density part, and (3) and (4) are the front and back nonwoven fabric sheets. The net-like base (1) has a porosity of 89%, in which a large number of continuous synthetic polymer filaments (5) each having a diameter of approximately 1 mm are irregularly bent, intersect with each other, and are bonded at each intersection point to extend in the longitudinal direction. , is formed of a net-like material with an apparent thickness of 5 mm, and the high-density part (2) is integrally formed with the net-like base (1) by the synthetic polymer continuous filaments (5) at both ends of the net-like base (1). It is formed by a net-like part with a porosity of 72.5%, and has an apparent width of about 1 cm, and this high-density part (2) and the above-mentioned net-like base (1) form a long mesh core material with a width of about 10 cm. On the front and back sides of this reticulated core material are polyester spunbond water-permeable nonwoven fabric sheets (3) (4) with a basis weight of 100 g/m ² (fiber density 0.05 g/cm ³ ) and an apparent thickness of 2 mm. ) are pasted together to form the drainage material (6).

[0013] FIG. 3 shows a partially cutaway perspective view of the raw material of the drainage material (6). That is, the diameter is approximately 1 A large number of polypropylene continuous filaments (5) of mm are each bent irregularly and intersect with each other. It extends in the longitudinal direction while pointing, and is formed by being glued at each intersection. A wide (100 cm wide in the example) net-like base (1) with a porosity of 89%. In the width direction, high-density parts (2) with a width of about 2 cm are provided in parallel at intervals of about 10 cm. A net-like core material is used, and the above-mentioned nonwoven fabric sheets (3) and (4) are pasted on the front and back sides of this net-like core material. It is configured. FIG. 4 is a cross-sectional view of this raw material (7). This raw material (7) is non-woven Cut the center of the high-density area (2) along the cutting line (9) provided on the fabric sheet (3). By doing this, it is possible to obtain a drainage material (6) of a predetermined width with high-density parts (2) at both ends. Wear.

[0014] The raw material (7) for the drainage material (6) mentioned above can be efficiently manufactured as follows. Wear. That is, as shown schematically in FIGS. 5, 6 and 7, for example, a large number of The spinneret (13) has two rows of equally spaced spinning holes (11) in the width direction. Spinning yarn with additional spinning holes (12) arranged at 10 cm intervals to form degree portions (2) Using the nozzle (13), the polypropylene resin melt is spun into continuous filaments (5) through the spinning holes (12) and (13). (5), and below this spinneret (13), a lattice-like structure is formed as shown in Figure 8. As shown in FIG. The conveyor (2) is moved in the direction of the arrow at a speed slower than the falling speed of the filament (5). 0) The above-mentioned nonwoven fabric sheet (4) is supplied onto the nonwoven fabric sheet (4), and the spun continuous filament group is Draw irregular loops on the continuous filaments (5) (5) spun by letting (5)(5) fall naturally. The fibers are accumulated on the nonwoven fabric sheet (4) on the carrier (20), and the filaments (5) (5) are They are self-adhered to each other at each intersection, and the accumulated filaments (5 )(5) is not solidified, the nonwoven fabric sheet (3) on the surface side is stacked on top of it (5)(5) The non-woven fabric is applied to the front and back sides of the net-like core material formed by the filament (5) (5) group by supplying it under pressure. By adhering cloth sheets (3) and (4) in spots (8) and winding them up into a roll one after another. It can be manufactured continuously. At this time, the nonwoven fabric sheets (3) and (4) on the front and back sides are highly dense. In the high-density part (2), it is glued in a line along the high-density part (2), and the line is It can be seen through the front and back sides of the nonwoven fabric sheets (3) and (4), and serves as a guide when cutting.

[0015] Figure 5 shows the cutting procedure for the obtained raw material, and (9) shows the method for cutting the raw material obtained. This is a perforation line placed in a predetermined position in order to facilitate cutting of the sheet (3). Note that there are no particular limitations on the spacing between the high-density portions (2) in the above embodiments. It is better to set it arbitrarily based on the specifications instead of However, keep a distance of about 10 cm. By selecting the cut point, you can obtain drainage material with a width of 20 cm or 30 cm. The obtained drainage material has high-density parts (2) (2) on both edges and satisfies the present invention. be able to.

[0016]

[Effect of the idea]

In this way, the drainage material for civil engineering according to the present invention is composed of a large number of synthetic materials with diameters of 0.5 to 1.5 mm. Each of the continuous polymer filaments (5) is irregularly bent and extends in the longitudinal direction while crossing each other. Net-like base with high porosity (1) bonded at each intersection And, at both ends of the net-like base (1), a polyurethane with a smaller porosity than the net-like base (1) is provided. A long reticulated core material is formed by the high-density part (2) in which several continuous synthetic polymer filaments are arranged. Thin water-permeable nonwoven fabric sheets (3) and (4) are laminated on the front and back sides of the reticulated core material. There is a gap (throughput) between the front and back nonwoven fabric sheets (3) and (4) due to the net-like base (1). Conventional paper drain or sheet drain Similarly, when used buried in the soil, a sufficient water passage is secured despite the earth pressure, and the surface The moisture flowing into the net-like base (1) through the non-woven fabric sheets (3) and (4) on the back is converted into a synthetic polymer. The drainage material (6) flows in the longitudinal direction along the void passage formed by the continuous striations (5). can be guided in the desired direction for smooth drainage. Moreover, both ends have high density. Since the drainage material has two edges (2) and (2), it prevents dirt from entering from both edges of the drainage material, allowing it to last for a long time. It has practical beneficial effects such as being able to maintain the water drainage function.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of the drainage material of the present invention.

FIG. 2 is a cross-sectional view in the width direction of FIG. 1;

FIG. 3 is a partially cutaway perspective view of the raw material.

FIG. 4 is a partially omitted cross-sectional view in the width direction of FIG. 3;

FIG. 5 is a partially cutaway perspective view showing how to cut the raw material.

FIG. 6 is a partially omitted bottom view showing the spinning holes of the spinneret.

FIG. 7 is a simplified side view illustrating a method for producing a drainage material raw material.

FIG. 8 is a partial perspective view showing the surface of the carrier.

[Explanation of symbols]

1 Reticular base 2 High density area 3 Non-woven fabric sheet 4 Non-woven fabric sheet 5 Continuous line 6 Drainage material 7 Raw materials

Claims (2)

[Scope of utility model registration request] Claim 1: A void formed by a large number of continuous synthetic polymer filaments having a diameter of 0.5 to 1.5 mm, each of which is irregularly bent, extends in the longitudinal direction while crossing each other, and is bonded at each intersection. A long net-like core material is formed by a net-like base having a large ratio and a high-density portion of a large number of continuous synthetic polymer filaments formed at both ends of the net-like base and having a smaller porosity than the net-like base, This drainage material for civil engineering is characterized by having thin water-permeable nonwoven fabric sheets bonded to the front and back sides of this net-like core material. 2. A void formed by a large number of continuous synthetic polymer filaments each having a diameter of 0.5 to 1.5 mm, each of which is irregularly bent, extends in the longitudinal direction while intersecting each other, and is bonded at each intersection. A net-like base with a high porosity, and a number of narrow high-density synthetic polymer continuous filaments with a smaller porosity than the net-like base are arranged parallel to each other at intervals in the width direction of the net-like base. A net-like core material is formed by the parts, and thin water-permeable nonwoven fabric sheets with a basis weight of 20 to 200 g/m ² and a fiber density of 0.03 to 0.08 g/cm ³ are bonded to the front and back sides of this mesh core material. A drainage material for civil engineering that is characterized by: