JP2570968Y2 - Drainage material for civil engineering - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage material for civil engineering used for draining excess soil water from soft ground at the time of civil engineering work such as reclamation.

[0002]

2. Description of the Related Art In recent years, ground improvement for reinforcing drainage by effectively draining soil water has been actively performed. In this method, a long drainage material is generally buried horizontally, vertically, or inclined in the soil, and a drainage channel is established to secure excess water in the soil by securing a water passage for earth pressure. is there.

A relatively bulky nonwoven fabric is often used as the drainage material. However, when the earth pressure at the time of embedding increases, the fiber gap of the nonwoven fabric is crushed, the water passage is closed, and good drainage cannot be performed. was there. In order to reduce the influence of earth pressure, drainage material treated as a synthetic resin molded plate having a relatively rigid corrugated shape or projections is used, but it is treated as a long material because it cannot be rolled. However, it was inconvenient and inefficient for transportation and construction.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a drainage material for civil engineering that has a high pressure resistance in the soil, has an excellent drainage function and a reinforcing function, and is easy to handle as a long object. It is assumed that.

[0005]

According to the structure of the present invention, both front and rear ground structures 3 are made of synthetic resin and have a fineness of 200 to 1,000 dr.
Thickness connected by connecting yarn 4 made of monofilament
A three-dimensional structure double knitted fabric of 5 to 30 mm is used as a core material, and a large number of water passage holes 5 are formed on both surfaces of the core material.
m is a drainage material for civil engineering characterized by laminating a flexible sheet 2 made of synthetic resin having a thickness of m .

The three-dimensional structure double knitted fabric used as the core material of the civil engineering drainage material 1 of the present invention can be woven by a conventional double Raschel knitting machine or moquette loom. The front and rear ground structures 3 can be combined with any structure, and are, for example, a mesh or flat plate combination. In addition, the yarn used for knitting the front and rear ground structures 3 is made of a synthetic resin monofilament in terms of durability and strength.
Multifilaments, flat yarns and the like are suitable, and the chain yarn and the inserted yarn may be of different types.

[0007] The synthetic resin used is not particularly limited, but a thermoplastic synthetic resin corresponds to stable quality in continuous production and economical mass production. Examples thereof include ethylene, propylene, 1-butene, and the like. Homopolymers or mutual copolymers of α-olefins such as 4-methyl-1-pentene or these α-olefins and other comonomers
Polyolefin-based resin consisting of a copolymer, polyester-based resin, polyamide-based resin, polyvinyl chloride-based resin,
And polyvinylidene chloride-vinyl copolymer resin.

The front and rear ground structures 3 are connected by a connecting yarn 4 to exhibit a three-dimensional structure. The spacing and direction can be arbitrarily selected in consideration of the physical properties of the connecting yarn.
It can be vertical, diagonal, or intersecting. Therefore, the connecting yarn 4 to be bridged is made of a synthetic resin having a fineness of 200 to 1,000 dr, more preferably 35, in terms of non-water absorption, weather resistance and durability.
A monofilament of 0 to 750dr is used. This is because when the fineness is low, the three-dimensional structure of the core material is not maintained against the earth pressure, causing the drainage to be impeded, and when the fineness is high, the knitting and weaving efficiency is affected. Becomes

The synthetic resin used is not particularly limited, but a polyamide resin is most preferable in terms of rigidity, toughness and hardness when formed into a monofilament. Further, regarding the thickness, in handling during construction including pressure resistance and transportation, 5 to 30 mm thickness, more preferably 7 to 30 mm
It is 20mm thick.

A flexible sheet 2 made of a synthetic resin having a large number of water holes 5 is bonded to both sides of the core material.
The laminating method can be performed by means of an adhesive, heat seal, laminate, hot melt web or powder fusion. The thickness of the flexible sheet 2 is preferably from 50 to 200 μm, and if it is less than 50 μm, the strength is weak and it is easy to break in the soil, and if it exceeds 200 μm, it is inferior in flexibility and difficult to wind as a material. Becomes

A large number of water holes 5 of the flexible sheet 2
May be bonded to the core material after perforating the sheet alone, or may be perforated after bonding to the core material. Regardless of the shape of the water passage hole 5, such as a round hole, an elliptical hole, a slit hole, etc., the size is set according to the particle size of the earth and sand, and the number of holes is arbitrary.

[0012]

The drainage material for civil engineering 1 of the present invention is formed by bonding a three-dimensionally double knitted fabric to a core material and adhering flexible sheets 2 which can be permeable to both sides thereof. -When excess soil water flowing from the water hole 5 of the port 2 is drained through the core material,
Good drainage can be performed by securing a gap in which the core becomes a water channel against the pressure in the soil.

[0013]

[Embodiment] Hereinafter, an embodiment will be described.

Example 1 In knitting the front and rear fabrics 3 using a 14G double Raschel machine, a multifilament made of polyester having a total fineness of 350dr / 46f is used for the chain yarn, and a flat yarn made of polypropylene having a fineness of 750dr is used for the inserted yarn. A flat ground texture was obtained by using the As the connecting yarn 4 for bridging between the front and rear fabrics, a monofilament made of nylon 6 and having a fineness of 500dr is selected to obtain a core material of a three-dimensional structure double knitted fabric having a knitting structure shown in Fig. 1 and a thickness of 10mm. Was. In FIG. 1, L1 and L5 are insertion yarns,
L2 and L4 represent chain yarns, and L3 represents a connecting yarn. Here, the connecting yarn 4 of the core material connects the front and rear ground structures substantially vertically.

Next, a flexible sheet 2 in which water holes 5 having a diameter of about 1 mm are arranged in a zigzag pattern at intervals of 10 mm on a polypropylene sheet having a thickness of 150 μm is used as an epoxy adhesive. Example 1 was partially applied and laminated on both sides of a core material.
Of the civil engineering drainage material 1. FIG. 2 shows a partial cross section of the first embodiment.

Example 2 In knitting the front and rear fabrics 3 using a 14G double Raschel machine, a high-density polyethylene monofilament having a fineness of 400 dr is used for the chain yarn and a high-density polyethylene monofilament having a fineness of 700 dr is used for the insertion yarn. It was used as a small mesh ground structure. As the connecting yarn 4 for bridging between the front and rear fabrics, a monofilament made of nylon 6 having a fineness of 450 dr was selected to obtain a core material of a three-dimensional structure double knitted fabric having a thickness of 7 mm. Here, the connecting yarn 4 connects the front and rear ground structures in a cross-like manner.

Next, a low-density polyethylene is coated on both sides of the core material by a melt extrusion laminating method to a thickness of 50 μm to form a flexible sheet 2.
Were opened at intervals of 20 mm to obtain a civil engineering drainage material 1 of Example 2. FIG. 3 shows a partial cross section of the second embodiment.

[0018]

[Effects of the Invention] The drainage material for civil engineering according to the present invention is a double knitted fabric made of synthetic resin thread, and flexible sheets are bonded to both surfaces thereof. It has sufficient flexibility, can be manufactured to be relatively wide and long, and can be wound, so that it is easy to handle in storage, transportation, and construction.

Further, in the three-dimensional structure double knitted fabric of the core material, since the front and rear ground structures are connected by a connecting yarn having an appropriate rigidity, a gap between the ground structures is provided by the compression elasticity provided. It is ensured against the pressure, and has an effect of preventing poor drainage of excess soil water flowing from the water passage hole of the flexible sheet.

[Brief description of the drawings]

FIG. 1 shows a knitting structure diagram of a core material used in Example 1.

FIG. 2 is a partial cross-sectional view of the civil engineering drainage material of Example 1.

FIG. 3 is a partial sectional view of a civil engineering drainage material according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drainage material for civil engineering 2 Flexible sheet 3 Ground structure 4 Connecting thread 5 Water hole L1, L5 Insert thread L2, L4 Chain thread L3 Connecting thread

Claims (1)

(57) [Scope of request for utility model registration] 1. A fabric 2 having a fineness 2 made of a synthetic resin.
A core material is a three-dimensionally structured double knitted fabric having a thickness of 5 to 30 mm connected by a connecting yarn 4 made of a monofilament of 00 to 1,000 dr, and a large number of water holes 5 are formed on both surfaces of the core material.
Flexible sheet 2 made of synthetic resin having a thickness of 50 to 200 μm
A drainage material for civil engineering characterized by laminating.