JPH086819Y2 - Resin net for civil engineering - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a resin net for civil engineering work, which is buried in soil for surface treatment of soft ground or for embankment reinforcement in civil engineering work.

[Conventional technology]

Conventionally, for example, as a reinforcing material for civil engineering work that reinforces the embankment on an upright surface or a steep slope, there is a resin net for civil engineering that is buried and used in these upright surfaces or steep slopes and is called geotextile. .

Conventionally, as the resin net for civil engineering work, for example, there is a resin net for civil engineering work having a mesh of several mm to several tens of cm produced by extruding synthetic resin from pores with an extruder.

As a resin material for such a conventional resin net for civil engineering work, for example, polyethylene, polypropylene, nylon or polyester is used.

The elongation at break of the resin net for civil engineering works made of these materials is usually 15 to 20%, and the strength at that time is relatively high at 1 to 10 t / m.

The surface of the resin net for civil engineering work is a smooth resin surface.

[Problems to be solved by the device]

For this reason, this conventional resin net for civil engineering works is, by its nature, used only where strength is required irrespective of elongation, like the civil engineering resin net for surface improvement of flat and soft ground. Although there is no hindrance, it is not preferable for reinforcing the embankment on the upright surface or the steep slope as described above.

It is generally said that the collapse of the embankment occurs when a strain of about 5% occurs, and the strength of the resin net made of conventional material at this time is 0.3 to 3 t / m (tandem
It is equivalent to about 6 to 60 t / m in terms of modulus).

By the way, as described above, in the conventional resin net for civil engineering which is made of thermoplastic synthetic resin such as polyester or polypropylene, the strength at the time of collapse of the embankment is 1 to 1.
Since it is as low as 3t / m, under the condition that the embankment collapses,
In the conventional net, only a part of the potential of the resin net could be utilized, and the number of laying machines had to be increased.

Also, in terms of the drainage function of this resin net for civil engineering work, although draining surplus water in the embankment early leads to an increase in the strength of the embankment, in the conventional resin net for civil engineering work, as described above, However, the surplus water could not be drained well in the predetermined direction because of the smooth resin surface.

The present invention has been made on the basis of such a conventional technique, and provides a resin net for civil engineering work capable of favorably reinforcing embankment and draining water.

[Means for solving the problem]

The present invention is made of a thermoplastic synthetic resin, and the resin net is fiber-reinforced with a core material made of a net-reinforcing fiber so that the tangential modulus at the time of breaking of the resin net is 80 t / m or more. A resin net for civil engineering work, characterized in that a drainage fibrous member is provided on the surface of the net.

[Action]

When the resin net for civil engineering work of the present invention is buried and constructed in a bank, for example, the potential of the material can be effectively exhibited due to the characteristics of the net, and the number of laid sheets can be economically designed. Therefore, it is possible to improve prevention of collapse of the embankment when the embankment is buried.

Further, since the surplus water in the embankment is absorbed by the drainage fibrous member and then drained in the predetermined direction along the drainage fibrous member, the surplus water in the embankment can be drained well.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The present invention is not limited to this embodiment.

In describing the present invention, a resin net for civil engineering work in which the meridian of the resin net is fiber reinforced with aramid fibers (wholly aromatic polyamide fibers and / or wholly aromatic polyetheramide fibers) will be taken as an example.

The resin net for civil engineering work according to the embodiment of the present invention comprises a resin net 10 and a net reinforcing fiber so that the tangential modulus (tangent elastic modulus) at break of the resin net 10 shown in FIG. 1 is about 80 t / m or more. A fiber 20 is reinforced with a core material 20 made of and a drainage fibrous member 30 is provided on the surface 10a of the resin net 10.

The tangential modulus here is the value obtained by dividing the strength per 1 m of product width at break by the elongation at break. For example, the strength at 5% elongation of resin net 10 is 4 t or more per 1 m in the width direction. Means necessary. When this is expressed by an equation, 4 [t] /0.05=80 t / m per 1 m product width.

Also, when the resin net 10 is stretched by 5%, it means 5
It is a concept that includes the time of expansion around 4.5%, specifically 4.5%
As mentioned above, it refers to the time of extension within the range of less than 5.5% and rounding to 5%.

This resin net 10 is buried in soil such as embankment,
Alternatively, it is a net material of a resin net for civil engineering work having a filtering function, a restraining function and a reinforcing function, which is used by being laid on the ground surface.

The resin net 10 is formed by extruding a thermoplastic synthetic resin, for example, a high-density polyethylene through a pore with an extruder, and a few mm to a few 10 cm, preferably 6 mm to 15 cm, more preferably 8 mm to 30 mm. A net consisting of a meridian 11 and a latitude line 12 having a length of 10 m and a latitude width of several meters, but the net is not necessarily limited to this type, but the mesh may be triangular or hexagonal, for example. It can also be used under other conditions.

As shown in FIGS. 2 and 3, the meridian line 11 of this embodiment has a tangential modulus of about 80 t / m or more when the resin net 10 is broken, that is, 5% elongation in this embodiment. In order to make the strength at the time of 4 tm or more per 1 m in the width direction, in the main body 111 made of high density polyethylene,
A filament-shaped core material (20) made of aramid fiber (wholly aromatic polyamide fiber) is embedded.

The thickness of this meridian body 111 is about 5 mm in diameter in this embodiment.
However, it is usually 1 to 15 mm, preferably about 2 to 10 mm.

The core material 20 is a fiber having a predetermined high strength because the tangential modulus at the time of breaking the resin net 10 is substantially 80 t / m or more.

The reinforcing fibers of the resin net for civil engineering work such as the core material 20 are weak in effect unless they are filamentary long fibers. This is because in the spun yarn made of short fibers, the fibers stretch smoothly and it is difficult to obtain a predetermined strength.

The thickness of the core material 20 is 6,000 denier in this embodiment, but the total denier is usually 100 to 90,000 denier,
It is preferably about 400 to 40,000 denier.

As described above, in this embodiment, the amount of the core material 20 made of the relatively expensive aramid fiber, which is the reinforcing fiber, is used in a small amount, which reduces the cost of the resin net for civil engineering work having the effect of the present invention. Can be achieved.

In this embodiment, as the meridian 11, the main body 111 made of high-density polyethylene, which is a general-purpose resin, is used in combination with the aramid fiber that is the reinforcing fiber, but the invention is not limited thereto. For example, thermoplastic synthetic resin such as low density polyethylene, polypropylene, nylon, polyester or polyvinyl chloride, ultra high molecular weight polyethylene fiber, or amorphous metal fiber,
It may be one in which a core material 20 made of a reinforcing fiber made of a material having a predetermined high strength such as an inorganic fiber such as boron fiber is embedded.

Other fiber materials of the core material 20 include, for example, Technora (manufactured by Teijin Ltd.), Kevlar (manufactured by DuPont),
Examples include arylate fiber, glass fiber, steel fiber, carbon fiber and the like, and the strength and breaking elongation of these materials are as shown in Table 1.

Although the core member 20 is embedded only in the meridian line 11 in this embodiment, it is not necessarily limited to this.
Although it may be embedded in the core material 20, these fibers having a high tenacity, which are the raw materials of the core material 20, are usually relatively expensive, and therefore are not used for both the meridian line 11 and the latitude line 12. It may not be economically preferable.

As shown in FIGS. 2 and 3, the latitude line 12 is a high-density polyethylene line made of the same material as the meridian line body 111, and its thickness is about 5 mm in this embodiment. It is about 15 mm, preferably about 2 to 10 mm.

Further, the tangential modulus at the time of breaking the resin net 10 in this embodiment is 100 t per 1 m in the net width direction.
(Strength at 5% elongation corresponds to 5t per 1m in the net width direction), but in the present invention, in order to prevent collapse of the embankment when burying the embankment, approximately 80t per 1m in the net width direction (5% expansion) The strength of time is 4 per 1m in the width direction of the net.
(equivalent to t) or more, preferably about 100-200t (5% extension strength is 5-10t per 1m in the net width direction)
(Equivalent to
However, since it does not have sufficient strength at the time of elongation of 5% of strain at the time of collapse of the embankment, it is not possible to sufficiently improve the prevention of collapse of the embankment.

If the tangential modulus at break of this resin net 10 exceeds 200t, it becomes an expensive net,
Practically economically unfavorable.

The drainage fibrous member 30 is a fibrous member for favorably draining excess water in the embankment, and in this embodiment, only on one side of the meridian 11 which is a part of the surface 10a of the resin net 10, It is fixed over the entire length of this meridian 11, but it is not necessarily limited to this, for example, on both the front and back sides of the meridian 11, and over part or the entire length of this meridian 11, or on one side or both sides of the latitude line 12. Also, it may be fixed over a part or the entire length of the latitude line 12. Further, the means for fixing the drainage fibrous member 30 to the resin net 10 is adhesion,
A general fixing means such as fusion or entanglement by spiral winding can be adopted.

Further, although filaments are used as the drainage fibrous member 30 in this embodiment, for example, spun yarns, molding yarns, strings, tapes, etc. can also be used.

Further, polyethylene terephthalate is used as the material of the fibrous member 30 for drainage in this embodiment, but in addition to this, synthetic fiber such as polyamide such as nylon 6, nylon 6,6, polyvinyl chloride, polypropylene, polyethylene and the like. Chemical fibers such as rayon, cotton, wool and hemp, and natural fibers can also be used.

Further, the total denier of the fibers used in the drainage fibrous member 30 is 500 to 100,000 denier, preferably 2,000.
It is 0 to 70,000 denier, and if it is less than 500 denier, the drainage of surplus water in the embankment is reduced, while if it exceeds 100,000 denier, moldability and processability become difficult.

The amount of the drainage fibrous member 30 used is 100 m of the drainage fibrous member 30, if stated in terms of fiber basis weight.
It can be said to be 5 to 120 g, preferably 22 to 78 g.

Next, when the resin net for civil engineering work of this embodiment is used for reinforcing reinforcement, for example, the resin net for civil engineering work shown in FIG. 1 is attached to the drainage fibrous member 30. On the inside and the direction of the meridian 11 toward the lateral direction of the embankment so as to be embedded and buried in the embankment. In this way, because the resin net for civil engineering work is buried with the attachment side of the drainage fibrous member 30 facing inward, the drainage of excess water in the embankment is further improved, but it is not necessary to do so. The drainage fibrous member 30 may be embedded with the attachment side facing outward.

After that, at the time of collapse when the embankment collapses due to, for example, heavy rain, even if the resin net 10 expands by approximately 5%, for example, the resin net 10 will not be broken at the time of breakage to prevent the embankment from collapsing. Since the tangential modulus has 80t or more per 1m in the width direction of the net, it is possible to improve the prevention of collapse of the embankment.

Further, in this embodiment, when the resin net 10 is broken, the tangential modulus is about 80 t or more per 1 m in the resin net width direction, so that the core material 20 made of aramid fiber having a predetermined high strength in the meridional body 111. Is buried,
Therefore, the tangential modulus at the time of breaking the resin net 10 can be easily set to about 80 tons or more, and the cost of the resin net for civil engineering work can be reduced.

In addition, the surplus water in this embankment is the fibrous member 30 for drainage.
Since the water is absorbed by and then discharged along the drainage fibrous member 30 in a predetermined direction, excess water in the embankment can be drained well.

The embodiment of the present invention has been specifically described above with reference to the drawings. However, the present invention is not limited to this embodiment, and there are changes in the configuration and operation without departing from the scope of the present invention. Even included in the present invention.

For example, in the examples, the reinforcing fiber of the resin net for civil engineering work was used as the core material of the meridian line, but without being limited to this, the weft line also buries the core material made of such reinforcing fiber,
Tangential at break per 1m in net length direction
It is possible to set the modulus to approximately 80t / m or more.

Further, the resin net for civil engineering work of the present invention is not only embedded in and applied to the embankment constructed at the time of land preparation, but also other things such as being laid in the lower layer of the embankment constructed on soft ground. It can also be used for purposes.

[Effect of device]

Since the resin net for civil engineering work of the present invention is such a structure, the number of laying sheets can be economically designed for reinforcement of the embankment, and the prevention of collapse of the embankment can be improved.

In addition, the drainage fibrous member provided on the surface of the resin net also has an effect that the surplus water in the embankment can be drained well.

[Brief description of drawings]

FIG. 1 is a plan view of a resin net for civil engineering work according to an embodiment of the present invention, FIG. 2 is a partially enlarged plan view of a sheet for civil engineering work according to an embodiment of the present invention, and FIG. 3 is III- of FIG. It is a III sectional view. 10; resin net 10a; surface 11; meridian line 111; meridian line body 12; weft line 20; core material 30; fibrous member for drainage

Claims (1)

[Scope of utility model registration request] 1. A resin net is made of a thermoplastic synthetic resin and reinforced with a core material made of net-reinforcing fiber so that the tangential modulus at break of the resin net is 80 t / m or more. A resin net for civil engineering, characterized in that a fibrous member for drainage is provided on the surface of the resin net.