JP2660572B2 - Civil engineering net - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a civil engineering net, and as a net for soft ground,
Also, the present invention relates to a civil engineering net suitable for reinforcing and stabilizing embankment in railroad tracks, roads, residential land development, and the like.

[Conventional technology]

2. Description of the Related Art Synthetic resin nets and metal nets have been widely used for reinforcement of embankments such as roads and residential land development.

These nets are made of a thermoplastic resin such as polyethylene or polypropylene, and are long nets of extruded thick strands with square corners and rhombuses. Usually, non-stretched nets are used.

Also, a net obtained by biaxially stretching a porous thick plate of a thermoplastic resin has been used.

In addition, a woven net made of resin-impregnated woven fabric with a large entanglement using nylon or polyester drawn yarn as the weft has come to be used for soft ground.

However, such a conventional net has the following problems when used for embankment reinforcement or the like.

[Problems to be solved by the invention]

In general, a long net made of a synthetic resin made of a thick strand extruded and widely used has a large cross section of the strand in order to increase the tensile strength of each strand. As a result, the weight of the entire net becomes enormous, which not only increases the cost of materials but also makes transport and handling inconvenient. That is,
This type of net has a problem that it is impossible to significantly increase the tensile strength of the net itself within the allowable range of material cost and carrying weight.

Also, a biaxially stretched thermoplastic resin porous plate is a net,
Although the tensile strength is very high, there is a problem that large-scale equipment is required to manufacture the net.
In addition, because it is biaxially stretched, it becomes a rigid thin plate or a slightly thick film, and when embedded as a reinforcing material such as embankment, it may not be easily adapted to the soil, and the pullout resistance is small and it slides inside the embankment There was a problem that it was easy to slip out.

In addition, a woven net in which resin is impregnated into a large entangled woven fabric using nylon and polyester pulling yarns in the process,
It is excellent in tensile strength and toughness, and has low rigidity and light weight, so that there is an advantage that it is easier to use than other resin nets. However, unlike other resin nets, the crossed warp yarns are only solidified with resin, causing collapse easily, making it difficult to use as a civil engineering net, especially as a reinforcing material for embankment. was there.

[Means for solving the problem]

The present invention pays attention to the advantages of a woven net that is lighter than conventional synthetic resin nets and has excellent tensile strength, and further improved it, and was able to invent a net suitable for embankment reinforcement and the like. Things.

That is, the present invention relates to a resin impregnated material of a woven net fabric in which wefts and warps composed of aggregates of fibers are woven with a mesh size of 10 mm or more and 30 mm or less, and has an interval of 400 mm or more and 1500 mm or less. And the weft is denser in the range of 10 mm or more and 50 mm or less.

In the present invention, the woven mesh has a mesh portion formed by plain weave or garment weave, and the latter has a little less collapse. However, since resin processing is applied, there is no fear of collapse in a normal state even in plain weave. As the warp yarn, a drawn yarn (may be somewhat twisted) or a twist yarn of various synthetic fiber filaments such as polyester, nylon, and vinylon is used. The tensile strength of the civil engineering net is determined by the type of fiber, the thickness of the yarn, the weaving density, and the like. For example, the polyester has a tensile strength of about 5 to 8 g / d. Moreover, this strength is further increased by resin impregnation. In addition to reinforcement, resin impregnation is useful for imparting rigidity, preventing blind spots, preventing fiber fraying, and the like. Various thermoplastic resins are used as the resin. Among them, polyvinyl chloride resin is most preferable in view of cost, affinity with fiber, and the like.

The processing is performed, for example, by impregnating the molten resin and then passing it through a squeeze roll. In addition, one woven net has a width of 2m to 3m
It is. The ends of the width are usually provided with tightly woven ears.

(Operation)

According to the configuration of the present invention, since the weft and the warp composed of the aggregate of the fibers are used, the tensile strength is large, the weight is light, and when it is used by being buried in the soil as a mesh for civil engineering, it is 10 mm or more. Since the mesh is less than 20 mm, the soil above and below the mesh is connected, the mesh and the soil are integrated, and the mesh restrains the soil.

In the case of a net with a mesh size of 10 mm or less, the soil above and below the net is separated, and the upper layer and the lower layer are separated by the net, causing problems such as slipping of the soil layer.

Further, when the mesh size is 30 mm or more, the tensile strength of the entire net becomes weak, and when used for reinforcing the embankment or the like, it is not suitable because it cannot fully resist the shearing force or the tensile force of the soil due to the collapse of the slope.

In addition, the net of the present invention has a dense weave of 10 mm or more and 50 mm or less in width at intervals of 400 mm or more and 1500 mm or less, so that the weft does not easily collapse, and when used for reinforcing embankment. In addition, it is possible to suppress the fluctuation of the embankment such as slippage and slippage of the soil without thread dropout, and to prevent collapse of the slope.
If the weft is 400 mm or less and a dense portion is provided, the embankment is divided vertically by the civil engineering net, and the existence of the net promotes the slippage of the soil. vice versa
In the case where dense portions of the weft are provided at an interval of 1500 mm or more, there is a problem that the weft may fall off between the portions, and it will not be able to withstand fluctuations of the embankment such as soil displacement and slippage.

In addition, if the weft has a densely woven portion of 10 mm or more, there is no worry that the weft easily comes off or shifts, and if the weft is 10 mm or less, the weft may fall out due to soil fluctuation depending on the soil properties There are cases.

Also, if the weft is denser with a width of 50 mm or more, when the usual seam is only about 400 mm, the embankment tends to be divided vertically by the net, and also economically 50 mm
The above is unnecessary.

〔Example〕

Next, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows an example of a civil engineering net according to the present invention. Although the length and width of the civil engineering net 1 are not particularly limited, it is usually a net having a length of, for example, about 25 m and a width of about 2 m. The net 1 has ears 5, 5 'at both ends in the width direction.
2 of the civil engineering net 1 is a weft, and 3 is a warp, and both are woven. The warp yarn uses two polyester filament aligned yarns (2000d) each, and the mesh part 6 is tied and woven. Can be used to the extent. Also 4
Is a densely woven portion, and the weft is increased with respect to the ordinary mesh portion 6 so that the wefts are gathered one by one so that they do not easily move or slip off one by one. And
The width L of 4 needs to be 10 mm or more, and a maximum of about 50 mm is sufficient. The dense portion 4 has a predetermined distance D in the longitudinal direction.
Are provided repeatedly and continuously. The interval D is 400 mm or more, and may be used as long as the length is 1500 mm or less, but more preferably 800 mm to 1200 mm.

Ears 5, 5 'at both ends of the civil engineering net 1 are plain weave by increasing the number of warp yarns 3 and dividing the weft yarn 2 into two to prevent the fraying of the weft yarn 2. In addition, a cloth (not shown) or the like may be sewn to prevent fraying of both ends. The width of such ears 5,5 'and the fabric is about 5 to 10 cm.

The above woven web is processed with a polyvinyl chloride paste to prevent collapse.

FIG. 2 shows another embodiment of the civil engineering net according to the present invention, in which ordinary mesh portions 6 and ear portions 5, 5 'are the same as those in FIG. 2, the warp 3 is divided into two to make a plain weave. The woven web is processed by resin by passing between rolls.

FIG. 3 shows an example in which the civil engineering net of the present invention is used for embankment P for roads. In order to prevent collapse of the road slope 10 on the embankment P, the civil engineering net 1 of the present invention is laid,
On the ground 11 that has been sufficiently hardened in advance, the longitudinal direction of the civil engineering net 1 is perpendicular to the
Lay them side by side so that their ears overlap slightly. And after laying everything on the ground 11, pull out the soil and 50cm
After embankment of about 200 cm, the net 1 is laid all over again, and embankment is performed again. Thus, as shown in FIG.
Embankment is formed. At this time, in the civil engineering net of the present invention, the place where the weft is coarse, that is, the dense part between the mesh part and the weft is provided at an interval. And the strength of the net can prevent the soil from shifting laterally against the shear stress acting between the soil above and below the net. In other words, in order to oppose the force with which the weft is pulled out of the net, the weft usually comes off or shifts greatly, but the net of the present invention easily comes off because of the dense portion of the weft. There is no significant displacement, and the net does not fall off, preventing the collapse of the slope.

〔The invention's effect〕

As is clear from the above description, the civil engineering net of the present invention is a net made of warp yarns in which fibers are converged, so that its tensile strength is extremely large, and particularly, the mesh of the mesh portion is small.
A portion of 10 mm or more, 30 mm or less is 400 mm or more, 1500 mm or less, and a dense portion of weft is 10 mm or more, is a civil engineering net of 50 mm or less, the mesh portion and the dense portion alternately exist Therefore, when buried in the ground as a net for civil engineering,
It exerts its function sufficiently against the pulling force applied to a strong net, and has a remarkable effect that the movement and displacement of the soil can be prevented.

In addition, since the woven net is impregnated with resin, there is little collapse, and it is extremely lighter than conventional ones, convenient for handling and transportation, and has a moderate flexibility, so it is very easy to adapt to soil. Having. In particular, when the civil engineering net of the present invention is laminated on an embankment, it exhibits a remarkable effect of preventing collapse of a slope.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing one embodiment of the present invention, FIG. 2 is a schematic plan view showing another embodiment of the present invention, and FIG. 3 is a perspective view showing one use example of the civil engineering net of the present invention. FIG. 1 ... civil engineering net, 2 ... weft, 3 ... warp, 4 ... dense portion of weft, 5 ... ear.

Claims (1)

(57) [Claims] 1. A weft and a warp comprising an aggregate of fibers of 10 mm.
Above, a resin impregnated material of a woven web woven with a mesh size of 30 mm or less, wherein the wefts are densely spaced in a range of 10 mm or more and 50 mm or less at intervals of 400 mm or more and 1500 mm or less. An earth net for civil engineering, characterized in that: