JPH086820Y2 - Sheet-shaped civil engineering drainage material - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a drainage material for civil engineering work, and more particularly to a sheet-shaped drainage material for civil engineering suitable for drainage of a land for construction or a ground.

(Prior 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. This is extremely important above. Nonwoven fabrics are widely used as sheet-like drainage materials used as such water drainage materials, and in particular, nonwoven fabrics subjected to needle punching of 100 to 500 g / m ² are preferably used. However, non-woven fabrics have the drawback that they are compressed by earth pressure and their water permeability decreases, and in recent years, for example, Japanese Unexamined Patent Publication No.
As seen in the publication, drainage materials in which a water passage is positively formed have been receiving attention.

(Problems to be solved by the invention) However, the drainage material described in JP-A-59-141620 is highly evaluated as an ideal sheet-shaped drainage material because of its excellent durability and durability of function. However, on the other hand, it is inevitable that the cost of drainage material will increase and the construction cost will increase significantly. The present invention has been made for the purpose of eliminating the above-mentioned weak points and providing a sheet-like drainage material for civil engineering which is excellent in the durability of the function and is inexpensive.

(Means for Solving Problems) The sheet-shaped drainage material according to the present invention is composed of a low-melting point component and a high-melting point component extruded from melt spinning, and at least the low-melting point component constitutes a part of the surface, and has a diameter of Each of the multiple thermo-adhesive composite filaments of 0.4 to 1.5 mm crosses each other and bends irregularly in the horizontal direction and the thickness direction and extends from one to the other. The low melting point component is melted by thermocompression bonding a thin water-permeable nonwoven fabric with a basis weight of 20 to 200 g / m ^{2 on} both sides of a mesh body with an apparent thickness of less than 10 mm adhered at each intersection. The body and the water-permeable non-woven fabric are bonded together, and the drainage channels are formed by the voids of the mesh body.

As the synthetic resin forming the reticulate body, a composite melt of thermoplastic synthetic resin such as polyamide, polypropylene and polyethylene can be applied, but polypropylene and polyethylene having a relatively low melting point are convenient in view of manufacturing cost. . The porosity of the mesh is preferably 85 to 95%, and the apparent thickness is less than 10 mm, preferably about 3 to 7 mm, which is advantageous in terms of flexibility and pressure resistance. Not only is compression deformation easily caused by the pressure, but also the rigidity is increased and it becomes difficult to wind it into a roll shape. The nonwoven fabric of water permeability which is laminated to the mesh body, having a basis weight spunbonded nonwoven 20 to 200 g / m ^2, especially having a basis weight is 30 to 150 g / m ² about a thin spun-bonded nonwoven fabric is preferred. The reticulate body and the water-permeable nonwoven fabric are bonded together by melting the low melting point component of the heat-adhesive composite filament consisting of the low melting point component and the high melting point component of the filamentous material constituting the reticulated body, and A water passage is formed by a large number of composite filaments that are irregularly bent in the thickness direction.

(Operation) The sheet-shaped drainage material according to the present invention has a three-layer structure in which a water-permeable non-woven fabric is bonded by thermal bonding on both sides of the mesh body composed of the heat-bonding composite filaments as described above. When embedded in soil, water in the soil flows into the layer of the mesh through the nonwoven fabric and flows from one side to the other through the voids formed by the composite wire to effectively remove the water in the soil. And the pressure resistance of the mesh body secures the water passage for a long time to maintain the drainage function.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

A large number of heat-bonded composite filaments (1) with a diameter of 1.0 mm extruded from the melt spinning machine have a low melting point component of polyethylene (melting point 13
4 ℃) and the high melting point component is polypropylene (melting point 167 ℃)
The core-sheath type heat-bondable composite filaments (1) having the former as the sheath component and the latter as the core component are mutually adhered at each intersection, and the apparent thickness is about 3 mm and the basis weight is about 3 mm. 300g / m ² Porosity of about 92% on both sides of a bulky sheet-like net (2) with a short fiber fineness of 1.0 denier and a basis weight of 3
By laminating thin water-permeable nonwoven fabrics (3) and (3) made of polyester spunbond of 0 g / m ² and thermocompression-bonding, the polyethylene of the low melting point component is melted and the upper and lower surfaces of the mesh body (2) are A sheet-shaped drainage material (4) is obtained by thermally bonding and bonding the nonwoven fabrics (3) and (3) at the bent top of the composite filament (1).

The sheet-shaped drainage material (4) having a three-layer structure according to the present invention can be efficiently manufactured as follows. That is, the third
As schematically shown in Fig. 4, Fig. 5 and Fig. 5, for example, a spinneret (10) provided with a large number of spinning holes (11) having a diameter of 1.0 mm in three rows at equal intervals in the width direction. The core-sheath composite adhesive wire whose low-melting point component is polyethylene (melting point 134 ° C) and high-melting point component is polypropylene (melting point 167 ° C) using the former as the sheath component and the latter as the core component. Article (1)
Is spun on a carrier (12) having a lattice-shaped slot (13) on its surface, and the carrier (12) is spun at a speed slower than the falling speed of the spun composite filament (1). To form a reticulated body (2) composed of the heat-bondable composite filament (1), and guide the reticulated body (2) to a hot air processing machine (14),
The nonwoven fabrics (3) and (3) are supplied to the front and back surfaces of the reticulated body (2) like sandwiching the reticulated body (2) immediately before the roller provided at the entrance of the hot air treatment machine (14) to supply the hot air treatment machine ( 1
4) Loaded into the heat-bonded composite filaments (1) of the net (2)
While being heated at a temperature between the melting point of the low melting point and the melting point of the high melting point component, it is guided to the outlet of the hot air processing machine (14) and pressed by a press roller provided at the outlet of the hot air processing machine (14). A continuous product which can be continuously manufactured by spotwise heat-bonding the front and back non-woven fabrics (3) and (3) at the contact portion with the mesh body (2), and is wound into a roll. Can be

(Effect of the Invention) As described above, the sheet-shaped civil engineering drainage material according to the present invention is
A void formed by extruding from a melt spinning machine, each of a number of heat-bonding composite filaments having a diameter of 0.4 to 1.5 mm, extending irregularly and extending in the longitudinal direction while intersecting each other, and being bonded at each intersection. The basis weight is large on both sides of the mesh.
It is composed of 20 to 200 g / m ² of water-permeable thin non-woven fabric bonded together, and since the non-woven fabrics on the front and back sides form voids due to the sheet-like mesh structure, it can be used as a conventional paper drain or sheet drain. Similarly, when it is used by being buried in soil, sufficient voids are secured regardless of earth pressure, and the water that has flowed through the nonwoven fabrics on the front and back into the mesh body is drained along the void passages formed by the composite filaments. It flows in the longitudinal direction of the material, can guide the water in the soil in the desired direction and can be drained smoothly, and the drainage function is maintained for a long time. Moreover, as described above, since it can be manufactured efficiently and easily, a highly functional sheet-shaped drainage material for civil engineering can be provided at low cost.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a partial sectional perspective view of the drainage material, FIG. 2 is a longitudinal sectional side view, and FIG. 3 is a manufacturing process of the drainage material of the present invention. FIG. 4 is a partial perspective view illustrating the surface structure of the carrier of FIG. 3, and FIG. 5 is a partially omitted bottom view showing the spinning holes of the spinning nozzle. (1) is a composite filament, (2) is a mesh, (3) is a non-woven fabric,
(4) is drainage material.

Claims (1)

[Scope of utility model registration request] 1. A diameter consisting of a low-melting point component and a high-melting point component, and at least the low-melting point component constituting a part of the surface has a diameter of 0.
Each of a large number of 4- to 1.5-mm heat-bondable composite filaments intersects with each other and bends irregularly in the horizontal and thickness directions and extends from one to the other. Each of the sheet-like nets with an apparent thickness of less than 10 mm formed by adhering at the intersection has a basis weight of 20
~ 200 g / m ² thin water-permeable nonwoven fabric is thermocompression bonded, a sheet-like characterized in that the reticulate body and the water-permeable nonwoven fabric are pasted together by the adhesive force of the low melting point component melted during this thermocompression bonding. Drainage material for civil engineering.