JP2512867Y2 - Drainage material for civil engineering - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application field] The present invention relates to a drainage material for civil engineering work,
More specifically, the present invention relates to a sheet-shaped drainage material for civil engineering, which is suitable for drainage of land and ground.

[0002]

2. Description of the Related Art In the field of civil engineering, for example, when constructing a new land, how to remove water contained in soil such as rainfall, compaction water, spring water, etc. prevents landslides represented by circular arc slides. It is very important to do this. Nonwoven fabric is generally used as a sheet-shaped drainage material applied to such an application, and particularly, the fabric weight is 200 to 50.
A non-woven fabric subjected to needle punching of 0 g / m ² is preferably used. However, the non-woven fabric sheet has a drawback that it is condensed by earth pressure and its water permeability is lowered, and in recent years, it is positive as shown in, for example, JP-A-59-141620 or JP-A-60-10012. Drainage materials with water passages have been attracting attention.

[0003]

[Problems to be Solved by the Invention] However, the above-mentioned JP-A-59
The drainage materials described in JP-A-141620 and JP-A-60-10012 can be highly evaluated as an ideal sheet-shaped drainage material excellent in durability and durability of function, but on the other hand, Material costs and production costs are high,
The construction cost is inevitably high, and there is a strong demand in the industry for inexpensive drainage materials with excellent sustainability of drainage function.

In order to meet this demand, the inventors of the present invention, as disclosed in Japanese Utility Model Laid-Open No. 63-95737, bond a water-permeable non-woven fabric on both surfaces of a mesh core material having an apparent thickness of 10 mm or less. Although we provided drainage material, this drainage material has excellent durability, but since the porosity at both ends of the reticulated core material is large, it is easy for soil to enter from the edge, and the penetration width of sand is It has the drawback of becoming narrower. An object of the present invention is to provide an inexpensive drainage material for civil engineering, in which the above problems are improved.

[0005]

[Means for Solving the Problems] The present invention is based on the above-mentioned Japanese Utility Model Publication No. 6
To densify both ends of a core material of a sheet-type civil engineering drainage material in which a water-permeable sheet is attached to the front and back of a core material that forms a water passage as described in JP-A-3-95737. Has improved the above-mentioned difficulties.

That is, the drainage material for civil engineering of the present invention has a diameter of 0.5.
A network base having a large porosity, in which a large number of synthetic polymer continuous filaments each having a diameter of .about.1.5 mm are irregularly bent, extend in the longitudinal direction while intersecting with each other, and are adhered at each intersection, and the network. A long net-like core material is formed at both ends of the base and has a porosity smaller than that of the mesh-like base, and a high density portion of a large number of synthetic polymer continuous filaments. It is characterized in that an aqueous nonwoven fabric sheet is laminated.

Such a drainage material has a large number of synthetic polymer continuous filaments having a diameter of 0.5 to 1.5 mm extruded from a melt spinning machine, each of which is irregularly bent and intersects with each other in the longitudinal direction. And a large number of synthetic polymer continuous filaments that are parallel to each other and are parallel to each other at intervals in the width direction of the reticulated base and have a smaller porosity than the reticulated base. 20 to 200 g / m ² , per unit of square rice, and a fiber density of 0.03 to 1 per cubic meter on the front and back of a wide reticulated core material formed by a narrow high density portion in which It can be easily obtained by making a raw material by laminating 0.08 g of a thin water-permeable nonwoven fabric sheet and cutting it on the line of the high density portion.

As the synthetic polymer constituting the reticulated core material, a single melt or a composite melt of two or more thermoplastic synthetic polymers such as polypropylene, polyamide and polyethylene can be applied, but in terms of production cost. When considered, polypropylene and polyethylene having a relatively low melting point are convenient. The porosity of the reticulated base is 80 to 95.
%, Apparent thickness is 10mm or less, preferably 3-7mm
The degree of flexibility and pressure resistance is advantageous, and when the apparent thickness is larger than 10 mm, not only is it easily compressed and deformed by earth pressure, but also the rigidity is increased and it becomes difficult to wind it into a roll shape.

Further, in the manufacturing process, the high density portions arranged in parallel with the mesh base at intervals have a porosity of 20 to 8
5%, preferably about 30 to 75% is advantageous in terms of flexibility. If it is less than 20%, the rigidity becomes large, making it difficult to wind it into a roll, and if it exceeds 75%, the sealing state becomes poor. The width of the high density portion is 10 to 30 mm, preferably 15 to 25 mm. If the length is less than 10 mm, the width of the high density portion becomes small and the sealing property deteriorates when cut in the longitudinal direction along the center line of the high density portion. If it is larger than 30 mm, the rigidity becomes large and it becomes difficult to wind it into a roll.

As the water-permeable non-woven sheet to be attached to the front and back of the reticulated core material, a non-woven sheet containing thermoplastic fibers, particularly a thin non-woven sheet containing thermoplastic fibers having a basis weight of about 30 to 150 g / m ² is suitable. Is. The mesh base material having the mesh base and the high density portion formed by the synthetic polymer continuous filaments and the non-woven fabric sheet are bonded to each other at a part of the mesh base and the high density portion, and the mesh base between the non-woven fabric sheets. Form an effective water passage.

[0011]

[Operation] When the drainage material of the present invention is laid in soil, the mesh base acts to form voids in the length direction between the non-woven sheets, and the non-woven sheets on the front and back sides allow moisture in the soil to be formed in the voids formed by the mesh base. It is introduced and allowed to flow through this void from one to the other, continuously draining water from the soil. In addition, the high density part prevents the drainage function from being deteriorated due to the inflow of earth and sand from the cut edge of the sheet of drainage material, and ensures an effective drainage function. The pressure resistance of the reticulated core material secures the water-permeable voids for a long period of time, and the nonwoven fabric sheet allows water to flow toward the water-permeable voids while blocking the inflow of earth and sand into the water-permeable voids.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway perspective view of the drainage material of the present invention, and FIG. 2 is a sectional view in the width direction. In the figure,
(1) is a mesh base, (2) is a high density part, and (3) and (4) are front and back non-woven sheets. The reticulated base (1) has a porosity of 89% in which a large number of synthetic polymer continuous filaments (5) each having a diameter of about 1 mm bend irregularly, intersect each other, and are bonded at each intersection to extend in the longitudinal direction. , Apparent thickness is 5mm
The high density part (2) is formed on both ends of the reticulated base (1) by the synthetic polymer continuous filaments (5) and has a porosity of 72.5% integrated with the reticulated base (1). It is formed by a net-like part and has an apparent width of about 1 cm.
(2) and the reticulated base (1) form a long reticulated core material having a width of about 10 cm, and the basis weight of the reticulated core material is 100 g / m ² (fiber density is 0.05 g / cm ³ ), And a water-permeable nonwoven fabric sheet (3) (4) of polyester spunbond having an apparent thickness of 2 mm is laminated to form a drainage material (6).

FIG. 3 is a partially cutaway perspective view of the raw material of the drainage material (6). That is, a large number of polypropylene continuous filaments (5) each having a diameter of about 1 mm are irregularly bent, extend in the longitudinal direction while intersecting each other, and have a porosity of 89% formed by being bonded at each intersection. The reticulated base (1) having a wide width (100 cm in the embodiment) is provided with high density portions (2) in parallel with about 2 cm width at intervals of about 10 cm in the width direction to form a reticulated core material. The non-woven fabric sheets (3) and (4) are attached to the front and back of the core material. FIG. 4 is a sectional view of this raw material (7). This raw material (7) is cut line (9) provided on the non-woven sheet (3)
By cutting the central part of the high density part (2) along
It is possible to obtain the drainage material (6) having the high-density portions (2) at both ends and having a predetermined width.

The raw material (7) of the drainage material (6) described above can be efficiently manufactured as follows. That is, FIG.
As shown schematically in FIGS. 6 and 7, for example, a large number of spinning holes (11) having a hole diameter of 1 mm are provided at equal intervals in two rows in the width direction in a spinneret (13) with high density. The polypropylene resin melt is spun through a spinneret (13) with a 10 cm space between the spinneret (12) to form part (2).
A continuous filament (5) (5) is spun out from (13) and is provided below the spinneret (13) with a grid-like groove hole (21) and a flat surface portion (22) as shown in FIG. As shown in FIG. 7, the body (20) is moved in the direction of the arrow at a speed slower than the falling speed of the spun continuous filament (5), and the non-woven sheet (4) is supplied onto the carrier (20). Then, the continuous filaments spun by spontaneously dropping the spun continuous filament group (5) (5) onto the nonwoven sheet (4).
(5) While drawing an irregular loop on (5), the carrier (20)
Stacked on the upper non-woven sheet (4), and at the time of stacking
(5) (5) self-bonds each other at each intersection, and while the accumulated filaments (5) (5) are not solidified, the above-mentioned non-woven fabric sheet (3) on the surface side is accumulated. Article (5)
(5) While applying pressure to the top, the non-woven sheets (3) and (4) are spot-bonded (8) to the front and back of the reticulated core formed by the filaments (5) and (5) groups, and then rolled sequentially. It can be continuously manufactured by winding it into a shape. At this time, the non-woven fabric sheets (3) and (4) on the front and back are
It is adhered in a line shape along (2), and the line can be seen through from the front and back surfaces of the non-woven sheet (3) (4), which serves as a guide for cutting.

FIG. 5 shows a cutting procedure of the obtained raw material, and (9) is a perforation line provided at a predetermined position in advance for easily cutting the nonwoven fabric sheet (3). . The interval between the high density portions (2) in the above embodiment is not particularly limited and may be arbitrarily set based on the specifications. However, if the intervals are about 10 cm, it is possible to obtain a drainage material with a width of 20 cm or 30 cm by selecting cutting points. The obtained drainage material has a high density part (2) (2) at both edges. It is possible to satisfy the present invention.

[0016]

As described above, the drainage material for civil engineering according to the present invention comprises a large number of synthetic polymer continuous filaments having a diameter of 0.5 to 1.5 mm.
A mesh base (1) having a large porosity, each of which is irregularly bent, extends in the longitudinal direction while intersecting with each other, and is adhered at each intersection, and the mesh base (1)
A long reticulated core material is formed at both ends of the reticulated base (1) with a high density portion (2) in which a large number of synthetic polymer continuous filaments having a smaller porosity are arranged, and the reticulated core is formed. A thin water-permeable non-woven sheet (3) (4) is attached to the front and back of the material, and a mesh base is placed between the front and back non-woven sheets (3) (4).
Since the void (water passage) due to (1) is formed, if it is used by embedding it in the soil like a conventional paper drain or sheet drain, a sufficient water passage will be secured despite the earth pressure, and Moisture flowing into the reticulated base (1) through the non-woven sheet (3) (4) flows along the longitudinal direction of the drainage material (6) along the void passage formed by the continuous line of synthetic polymer (5). Therefore, the water can be smoothly drained by guiding it in a desired direction. In addition, since it has high-density parts (2) and (2) at both ends, intrusion of sediment from both edges of the drainage material is prevented, and the drainage function can be maintained for a long period of time. Demonstrate.

[Brief description of drawings]

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

FIG. 2 is a sectional view in the width direction of FIG.

FIG. 3 is a partially cutaway perspective view of an original material.

FIG. 4 is a cross-sectional view of a part in the width direction of FIG.

FIG. 5 is a partially cutaway perspective view showing a procedure for cutting an original material.

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

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

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

[Explanation of symbols]

 1 reticulated base 2 high density part 3 non-woven sheet 4 non-woven sheet 5 continuous wire 6 drainage material 7 raw material

Claims (2)

(57) [Scope of utility model registration request] 1. A void in which each of a large number of synthetic polymer continuous filaments having a diameter of 0.5 to 1.5 mm is irregularly bent, extends in the longitudinal direction while intersecting with each other, and is bonded at each intersection. A long reticulated core material is formed by a reticulated base having a large ratio and a high density portion of a large number of synthetic polymer continuous filaments formed on both ends of the reticulated base with a porosity smaller than that of the reticulated base, A drainage material for civil engineering, characterized in that a thin water-permeable nonwoven fabric sheet is attached to the front and back of this mesh core material. 2. A void in which each of a large number of synthetic polymer continuous filaments having a diameter of 0.5 to 1.5 mm is irregularly bent, extends in the longitudinal direction while intersecting with each other, and is bonded at each intersection. A reticulated base having a large ratio and a plurality of narrow high-density filaments in which a large number of synthetic polymer continuous filaments are arranged parallel to each other in the width direction of the reticulated base in parallel with a smaller porosity than the reticulated base. And a thin net water-permeable nonwoven fabric sheet having 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 of the net core. A drainage material for civil engineering, which is characterized by that.