JP2539312B2 - Embankment reinforcement and reinforced embankment method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embankment reinforcing material for effectively draining underground water to reinforce an embankment and a reinforced embankment method using the embankment reinforcing material.

[0002]

2. Description of the Related Art The reinforced embankment method is a method for increasing the stability of an embankment by laying a material such as a non-woven fabric, a woven fabric, a grid or a net in the embankment and is widely known. However, although the woven fabric, the grid and the net have high tensile strength, they have little horizontal water permeation function, and thus have a drawback that the effect of draining underground water to increase the strength of the embankment itself is small. Further, although the nonwoven fabric has an excellent water permeability, it has a drawback that it has a lower tensile strength than fabrics, grids, nets and the like.

On the other hand, as a drain material for sucking up and draining underground water of soft ground such as landfills, a synthetic resin plate having concave and convex portions on both front and back sides is used as a core material, and non-woven fabric is stuck on both sides thereof. Is slit to a width of about 10 cm,
It is known to use this by vertically filling it up. If this drain material is used as a reinforcing material in the embankment method instead of a non-woven fabric, a woven fabric, a grid, a net, etc., it exerts both a drainage function and a tensile reinforcing function, and the disadvantages of the non-woven fabric, the woven fabric, the grid, the net, etc. Is likely to be able to compensate.

[0004]

However, even if the above-mentioned drain material is diverted to the embankment reinforcing material with the above structure, the collection of underground water is performed only at the portion corresponding to the concave portion of the core material. Therefore, the portion where the convex portion and the non-woven fabric are adhered does not substantially function as the water collecting area, so that the expected drainage effect could not be obtained. In addition, because the surface is made of a non-woven fabric, the friction resistance with the soil is small, and when used horizontally for embankment, the pull-out resistance is small and slip failure of the embankment It was not possible to sufficiently fulfill the function as a tensile reinforcing material for stopping the shaving. Further, although the concave portion of the core material serves as a drainage channel, the running water resistance during drainage is large, and the underground water cannot be efficiently drained.

An object of the present invention, when used for embankment reinforcement, is an embankment reinforcement having more excellent drainage and tensile reinforcement functions than conventional woven fabrics, non-woven fabrics, grids, nets and the like, and reinforcement using the same. It is to provide the embankment method.

[0006]

According to one aspect of the present invention for achieving the above object, a synthetic resin plate having convex portions and concave portions alternately formed on both front and back surfaces is used as a core material, and both sides of the core material are covered with the above-mentioned material. The embankment reinforcing material is characterized in that non-woven fabrics are laminated so as to be in contact with the surface of the convex portion, and a groove communicating with the concave portion is provided on the surface of the convex portion.

Further, another one of the present invention, which also achieve the object, Te reinforcement smell of the structure, a further embankment reinforcements by forming unevenness by changing the surface direction of the thickness to the surface of the nonwoven fabric is intended, characterized, also other one, the
In reinforcement of the shaft above configuration, in which further the bottom surface of the recess and wherein the embankment reinforcements curved recessed connection portion connected to the side surface of the convex portion.

In the reinforced embankment method using these, the embankment reinforcements are arranged horizontally or obliquely with respect to the construction surface to embank. In the embankment reinforcement material according to the present invention, the non-woven fabric acts as a filter for separating the embankment and the underground water, and has an excellent drainage function for taking in the underground water into the recess provided in the core material and guiding it outside the embankment. Exert. Further, since the nonwoven fabric is laminated on both sides of the core material made of a synthetic resin plate, the embankment reinforcement material can exhibit high tensile strength.

In a reinforcing material having a groove communicating with the concave portion on the surface of the convex portion of the core material, even if a non-woven fabric is bonded to the surface of the convex portion, the underground water is allowed to enter the concave portion of the core material through the groove. Since it is guided, the non-woven fabric portion corresponding to this convex portion can also function as a water collecting area, and a higher drainage function can be exhibited. Here, the depth of the groove provided on the surface of the convex portion is not particularly limited, but it is preferably 1/2 or less of the thickness of the synthetic resin plate in consideration of the strength of the core material.

Further, since the reinforcing material having unevenness on the surface of the non-woven fabric increases the frictional resistance between the non-woven fabric and the embankment and increases the pull-out resistance, a tensile reinforcing material for preventing the embankment from slipping in the shearing direction. Can exert excellent function as. Further, the non-woven fabric causes a thickness change depending on the unevenness and forms a density difference of fibers in the surface direction, so that it becomes possible to allow many kinds of voids having different sizes to exist, The clogging of the nonwoven fabric can be suppressed regardless of the particle size.

Further, the reinforcing material in which the connecting portion between the bottom surface and the side surface of the concave portion of the core material is curved in a concave shape can reduce the flow resistance of the drainage flowing through the concave portion, whereby the underground water can be efficiently discharged. Can be drained. The radius of curvature of the curved portion may be determined according to the width of the recess, and is preferably 1 / the width of the recess.
20 or more is recommended. On the other hand, in the reinforced embankment construction method according to the present invention, the above-mentioned embankment reinforcement may be horizontal or inclined with respect to the construction surface for embankment. At this time, the embankment reinforcing material is preferably slit into a width of 20 cm or more and laid inside the embankment. By using the embankment with such a wide width, the embankment reinforcing effect can be further enhanced. That is, the conventional drain material is used by making it into a width of about 10 cm and driving it vertically into the soft ground, but even if it is horizontally or inclined with such a narrow width and used for embankment, shearing of the embankment is performed. This is because it is difficult to function as a tensile reinforcing material that stops slippage.

The non-woven fabric used in the embankment reinforcement of the present invention is
The type is not particularly limited, and a nonwoven fabric made of short fibers, a nonwoven fabric made of long fibers, a synthetic fiber spunbonded nonwoven fabric, or the like can be used. In particular, the synthetic fiber spunbonded nonwoven fabric has the advantages of high strength and low cost. Further, since this synthetic fiber spunbonded nonwoven fabric has a structure in which long fibers extend in the surface direction, it is possible to prevent soil particles from entering the drainage channel of the core material, and is excellent in the function as a filter.

The fibers constituting the non-woven fabric are not particularly limited in terms of their materials, but natural fibers may corrode in a wet state, so it is preferable to use synthetic fibers. Such synthetic fibers include polyester fibers, polypropylene fibers, and polyamide fibers. In particular, polyester fibers have high resistance to compression force and excellent durability. Therefore, when polyester fibers are used as fibers constituting the non-woven fabric, the thickness retention of the non-woven fabric is further improved and so-called compression settling can be prevented. Further, the average single fiber fineness of the fibers forming the nonwoven fabric is preferably 0.5 to 5 denier. This is because if the average single fiber fineness is less than 0.5 denier, the durability and strength tend to decrease, and if it exceeds 5 denier, the spacing between fibers tends to be too large and soil particles and the like tend to enter. Because there is. The basis weight of the non-woven fabric is not particularly limited, but is generally about 30-
It is preferably 80 g / m ² .

The method for producing the above-mentioned non-woven fabric is not particularly limited, and includes a method of fusing fibers with a low melting point fiber as a binder, a method of adhering fibers with a resin binder, and a method of pressing fibers by embossing. like,
Various known techniques can be applied.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3, the core material 1 is formed from a synthetic resin plate having a thickness t of 0.5 to 1 mm, and groove-shaped concave portions 2 and convex portions 3 are alternately formed on both front and back surfaces thereof. It is provided in. The depth d of the concave portion 2 (or the height of the convex portion 3) can be 2 to 5 mm, and the width W can be 2 to 5 mm. The connection portion 2a connecting the bottom surface of the concave portion 2 and the side surface of the convex portion 3 is rounded with a radius of curvature r of 0.1 to 0.4 mm. A large number of grooves 3a are provided on the surface of the convex portion 3 so as to communicate with the concave portions 2 on both sides thereof.

The core material 1 having the concave portions 2 and the convex portions 3 as described above can be easily manufactured by embossing a flat synthetic resin sheet material. Groove 3a of convex portion 3
May be formed simultaneously with the molding of the core material 1, or may be provided by cutting after the molding of the core material 1.
The depth of the groove 3a is preferably 1/2 or less of the thickness t of the core material 1 (synthetic resin plate) in consideration of the strength of the core material, and may be, for example, 0.2 to 0.5 mm. .

The nonwoven fabric 4 has a thickness T of 0.1 to 0.5 mm.
In addition, the surface is regularly or irregularly provided with irregularities, and is adhered to both surfaces of the core material 1 by fusion bonding or adhesion. In this attachment, the nonwoven fabric 4 is the core material 1
A water passage is formed in the recess 2 in contact with the surface of the projection 3 . As a method for making the surface of the nonwoven fabric 4 uneven, there is a method of subjecting the nonwoven fabric 4 to pinsonic processing (ultrasonic processing) or embossing, or a method of making unevenness on both surfaces of the core material 1 in advance. In particular, when the non-woven fabric 4 is subjected to pin sonic processing or embossing, it is possible to provide density differences in which the sizes of the voids are different in the plane direction of the non-woven fabric 4.

In the embankment reinforcing material having the above structure, since the groove 3a communicating with the concave portion 2 is provided on the surface of the convex portion 3, the convex portion 3 is formed.
Even if the nonwoven fabric 4 is attached to the surface of the
Underground water can be guided to the concave portion 2 from the region corresponding to 1 through the groove 3a. Therefore, the water collecting area can be expanded and the drainage function can be enhanced. In addition, since the surface of the nonwoven fabric 4 is uneven, friction resistance with the embankment is increased and pull-out resistance is increased, so that the function as a tensile reinforcing material for preventing slip failure of the embankment glue is improved. You can Further, when the unevenness causes a density difference in the surface direction of the nonwoven fabric 4 to form voids of various sizes, it is possible to prevent clogging of the nonwoven fabric 4 corresponding to embankments of various grain sizes. Further, since the connecting portion 2a on the bottom surface of the recess is connected to the side surface of the projection, the flow resistance of the recess 2 against drainage can be reduced, and the underground water can be efficiently drained.

In the present invention, since the concave and convex portions of the core material are provided to secure the drainage channel of the underground water, the shape thereof is not limited to the above-mentioned embodiment and various shapes can be obtained. Can be in the shape of. For example, as in the embodiment shown in FIGS. 4 to 6, the block 1 may be provided with an independent block-shaped protrusion 13 and the other portion may be the recess 12. Also in this case, a concave curved portion is provided at the connecting portion 12a between the bottom surface of the concave portion 12 and the side surface of the convex portion 13, and the convex portion 1
A groove 13a communicating with the recess 12 can be provided on the surface of the groove 3. The block-shaped convex portion 13 may have a circular shape instead of the rectangular shape shown in the drawing.

[0020]

As described above, according to the embankment reinforcing material of the present invention, a synthetic resin plate having convex portions and concave portions on both front and back surfaces is used as a core material, and both surfaces of the core material are in contact with the surface of the convex portion.
The I Uni nonwoven laminated, and in the recess on the surface of the protrusion
Since the configuration in which a groove which communicates with a conventional woven, nonwoven, grid, it is possible to expect an excellent draining function and tensile capabilities compared to net etc., of the surface of the protrusion
Grooves increase the catchment area and improve the drainage function. Further, when the surface of the non-woven fabric is provided with irregularities, the friction resistance with the embankment is increased and the pull-out resistance is increased, so that the function as a tensile reinforcing material for preventing slip failure of the embankment glue part is improved. To do. Further, when the connection portion between the bottom surface of the concave portion and the side surface of the convex portion of the core material is curved in a concave shape, the running water resistance of the concave portion can be reduced and the underground water can be efficiently drained.

On the other hand, in the reinforced embankment method according to the present invention, since the above-mentioned embankment reinforcing material is used, the effect of reinforcing the embankment can be enhanced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embankment reinforcement material according to an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 2;

FIG. 4 is a sectional view showing an embankment reinforcement material according to another embodiment of the present invention.

5 is a view taken along the line CC of FIG.

FIG. 6 is a view on arrow D-D of FIG. 5.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Core material 2,12 Recessed parts 2a, 12a Connection part of a recessed part bottom face and a convex part side surface 3,13 Convex part 3a, 13a Groove 4 Nonwoven fabric

Claims (4)

(57) [Claims] 1. A synthetic resin plate in which convex portions and concave portions are alternately formed on both front and back surfaces is used as a core material, and a nonwoven fabric is laminated on both surfaces of the core material so as to be in contact with the surface of the convex portion, and the convex portion is formed. An embankment reinforcement material having a groove communicating with the recess on the surface. 2. A pre-Symbol embankment reinforcement according to claim 1 obtained by changing the thickness of the is formed by a surface direction irregularities on the surface of the nonwoven fabric. 3. A pre-Symbol serial connection part bottom leading to the side surface of the convex portion of the claim 1 or 2 curved concave recesses
Fill embankment reinforcement. 4. Sheng according to any one of請Motomeko 1-3
Reinforced embankment method in which earth reinforcement is placed horizontally or diagonally with respect to the construction surface for embankment.