JPH06294155A - Backfilling material - Google Patents

Abstract

(57) [Summary] [Structure] A plurality of balls 1 made of a substantially spherical foamed resin,
They are connected by a corrosion resistant synthetic fiber 2. [Effect] With the above configuration, when the outer surface 4a of the trough 4 is filled with the ball 1, the balls 1 can be densely filled along the shape of the outer surface 4a, for example, the curved portion or the uneven portion, so that conventional plastic foaming can be performed. Unlike the body, it is not necessary to mold the outer surface 4a in advance according to the shape of the outer surface 4a.
The cost increase can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backfill material suitable for use in waterways in cold regions.

[0002]

2. Description of the Related Art Conventionally, in a trough which is a V-shaped groove or a U-shaped groove used as a water channel, for example, as shown in FIG. After laying the foundation base 12 on the bottom, install the trough 11 on it, and fill the outer surface of the trough 11 with a backfill material 13 such as sand or gravel so that overflow water can be quickly drained. Has been done.

However, in cold regions, the freezing phenomenon occurs in which the water contained in the surface layer of the ground freezes and expands at night in winter, causing horizontal pressing, while the ice melts in the daytime. Contract. When such expansion and contraction are repeated, the trough 11 as described above is likely to be damaged at the rising portion of the trough 11 as shown by the chain double-dashed line in the figure. For this reason, in cold regions, repair work for such a damaged trough 11 was very expensive.

Therefore, in order to avoid such damage,
As disclosed in Japanese Utility Model Publication No. 4-10272, a plastic foam having a void and water permeability is provided as a backfill material on the outer surface of a trough having a substantially U-shaped cross section, and as described above. A structure has been proposed that can absorb and disperse the pressure caused by freezing and reduce damage to the trough.

Such a plastic foam is formed by adhering or fusing foamed granules to each other so as to form a water-permeable gap on the surface in an amount of 5 to 65%. is there. As a result, the plastic foam described above is lighter in weight than the conventional backfill material such as sand and gravel, and is integrated, so that the filling work on the outer surface of the trough can be speeded up. There is.

[0006]

However, in the above-mentioned conventional plastic foam as a backfill material, it is necessary to form the trough in advance so as to follow the shape of the trough, for example, a curve or a convex portion, which increases the cost. Is causing the problem.

[0007]

In order to solve the above-mentioned problems, the backfill material of the present invention comprises a plurality of spheres formed by molding a foamed resin into a substantially spherical shape and connected by a corrosion-resistant filamentous material. It is characterized by being.

[0008]

In the structure according to claim 1, when filling the outer surface of the groove body, for example, since it is connected and integrated by the filamentous body, a plurality of spheres can be thrown in by one throwing operation, The filling and filling work on the outer side surface of the groove body can be performed in the same manner as the backfilling of the backfill material such as sand and gravel in the related art.

In addition, in the above structure, when the outer surface of the groove body is filled in a cold region, for example, since the sphere has elasticity, it absorbs the pressing force to the groove body at the time of freezing in winter, or vertically and horizontally. It is possible to transmit and disperse to each sphere, and to disperse the pressing force. As a result, the above configuration can reduce the pressing force on the groove body during frost heave.

Further, in the above structure, the spheres can be densely packed so as to follow the shape of the outer surface of the groove body, so that the spheres can be filled regardless of the shape of the outer surface of the groove body.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS. 1 and 2. The backfill material is
As shown in FIG. 1, a large number of balls (spheres) 1 made of expanded resin such as expanded polystyrene are connected by a synthetic fiber (filament) 2 made of polypropylene having corrosion resistance. The ball 1 is molded to a diameter of 40 mm by, for example, a bead molding method or a bead fixing mold method. However, the size of the ball 1 can be changed according to the purpose of use. The synthetic yarn 2 is a collection of many polypropylene yarns.

The connection of the balls 1 by the synthetic yarn 2 is performed between the molding dies of the balls 1 so that the balls 1 have a predetermined interval when the balls 1 are foam-molded.
The ball 1 is foamed and molded, and the synthetic fiber 2 is sandwiched between the balls 1 and fixed.

At this time, the ball 1 made of a resin such as polystyrene and the synthetic yarn 2 made of polypropylene are well compatible with each other, and the synthetic yarn 2 is made of a large number of polypropylene yarns. It will be firmly bonded.

The length of the synthetic fiber 2 between adjacent balls 1 is set to, for example, about 70 mm, and the total length of the backfill material 3 connected in this way is set to about 1 to 2 m. . In the backfilling material 3 described above, an example in which the balls 1 are connected in a straight-chain form has been described, but the balls may be branched into two or three branches.

Next, an example of use of the backfill material 3 will be described. As shown in FIG.
For example, it is used for a concrete trough 4 having a substantially V-shaped cross section used as a water channel. Such troughs 4 are produced in advance in a factory with some predetermined standard dimensions, and are transported to a construction site.

In constructing such a trough 4, first, after forming a groove-like portion 5a which is dug down the laying ground 5 wider than the width of the trough 4, the above-mentioned trough is formed at the bottom of the groove-like portion 5a. Four
The base base 6 having a substantially plate shape is laid so as to be laid stably without interruption. The foundation base 6 is manufactured by, for example, assembling a wooden frame at the bottom of the groove-shaped portion 5a, pouring concrete into the wooden frame, and curing.

Subsequently, the troughs 4 are installed on the foundation base 6 so as to communicate with each other, and the troughs 4 are provided between the outer side surfaces 4a and 4a of the troughs 4 and the groove portion 5a. Three
Are filled and backfilled. After that, the surface soil portion 5b covering the backfilling material 3 is created to complete the water channel.

By the way, in a trough filled with sand or gravel as a backfill material for the outer surface of the trough, freezing pressure is generated in the horizontal direction due to freezing and expansion of water on the surface of the ground at night in winter. During the daytime, the ice melts and contracts, and thus repeated expansion and contraction causes damage to the trough.

However, in the configuration of the above embodiment,
Since the balls 1 of the backfill material 3 are made of foamed resin, the pressing force from the laying site 5 during freezing can be absorbed by the elasticity of the balls 1 or dispersed vertically and horizontally, and in addition, each ball 1 has a synthetic fiber 2 Since the balls 1 are connected with each other, the above-mentioned pushing forces can be dispersed vertically and horizontally even if the balls 1 can be displaced with respect to each other. If the pressing force disappears when the ice melts, the elastic deformation and mutual displacement of each ball 1 are restored. In this way, the force applied to the trough 4 can be dispersed and reduced, and the trough 4 can be prevented from being damaged by freezing.

On the other hand, when a backfill material such as sand or gravel is used for backfilling the outer surface 4a as described above, if soil is mixed into the backfill material, the material will be clogged and the drainage performance will deteriorate. It required time and effort to prevent soil from mixing.

However, in the structure of the above embodiment, even if soil, sand or gravel is mixed in the backfill material 3, clogging does not occur and drainage can be ensured and workability is improved. In addition, the frictional force between the balls 1 becomes large due to the soil between the balls 1 and the like, and the movement between the balls 1 is suppressed, so that the zone force can be improved. .

Further, the above-mentioned structure has the outer surface 4a of the trough 4.
When filling, the plurality of balls 1 are connected and integrated by the synthetic fiber 2, so that the plurality of balls 1 can be loaded by one loading operation, and the loading and filling operation can be performed on the back of conventional sand or gravel. The backfilling of the filling material into the outer side surface 4a can be speeded up.

In addition, the above structure allows the balls 1 to be densely packed along the shape of the outer surface 4a of the trough 4,
Since it can be filled regardless of the shape of the outer side surface 4a of the trough 4, it can be preliminarily molded so as to follow the shape of the trough, for example, along the curved portion or the convex portion of the trough, like a plastic foam as a conventional backfill material. It is possible to eliminate the need to keep it and avoid the cost increase. Further, in order to match the length of the trough 4, the cutting step of cutting the above-mentioned plastic foam can be omitted, and the above construction is superior in workability to the conventional one.

Further, in the above construction, since the back-filling portion filled with the back-filling material 3 has water permeability, it is possible to improve drainage of the surface layer portion of the laying site 5 which causes frost heave, and to retain in the laying site 5. By guiding the existing water to the lower part of the back-filling part, it is possible to reduce the frost heave of the surface layer part of the laying site 5, and while guiding the above-mentioned water downward away from the cold air, the ball 1 has a heat insulating effect, Water can be prevented from freezing and frost damage can be avoided.

In addition, since the balls 1 are connected by the synthetic fiber 2 even if the backfilling material 3 flows out due to unexpected water damage or the like, the backfilling material 3 does not become disjointed and the outflow distance can be shortened.
Further, when one ball 1 is found, the balls 1 connected to it can also be easily found, so that the outflowing backfill material 3 can be easily collected.

Further, since the backfilling material 3 is lighter than the conventional backfilling material such as sand or gravel, the equipment and labor for transportation and filling can be reduced, and since it is connected, it is partially Since it can be gripped and filled, it can be filled quickly and has excellent workability.

Although the trough 4 has a V-shaped cross section as an example, it is not limited to the above shape, and may have a U-shaped cross section. As the material of the ball 1, foamed clay or the like can be used.

In the above embodiment, the backfill material 3 is used for the trough 4, but the location is not particularly limited as long as it is a place where horizontal pressure is applied during freezing.
For example, it can be used as a backfill material for a retaining wall in cold regions.

In the construction of the above-mentioned embodiment, an example in which polypropylene yarn is used as the synthetic yarn 2 has been given, but it is not particularly limited as long as it is a filamentous material having corrosion resistance. For example, polyester yarn or Nylon yarn can be used, and furthermore, corrosion-resistant wire or the like can also be used.

[0030]

As described above, the backfill material according to the first aspect of the present invention has a structure in which a plurality of spheres formed by molding a foamed resin into a substantially spherical shape are connected by a corrosion-resistant filamentous material. is there.

Therefore, in the above structure, when the outer surface of the groove body is filled, for example, in a cold region, the spherical body has elasticity, so that the pressing force on the groove body at the time of freezing in winter is absorbed, or the vertical and horizontal directions are provided. Can be transmitted to and dispersed in each sphere, and the pressing force on the groove can be reduced, and the sphere can be densely packed along the shape of the outer surface of the groove, regardless of the shape of the outer surface of the groove. Can be filled.

As a result, the above-described structure is preliminarily molded in accordance with the shape of the outer surface of the groove body, for example, the curved portion or the convex portion on the outer surface, like a conventional plastic foam as a backfill material. Since there is no need to keep the cost, it is possible to avoid an increase in cost.

[Brief description of drawings]

FIG. 1 is a perspective view of a backfill material of the present invention.

FIG. 2 is a schematic sectional view of a trough to which the above backfill material is applied.

FIG. 3 is a schematic sectional view of a conventional trough.

[Explanation of symbols]

 1 ball (sphere) 2 synthetic yarn (filament)

Claims (1)

[Claims] 1. A backfill material, characterized in that a plurality of spheres formed by molding a foamed resin into a substantially spherical shape are connected by a corrosion-resistant filamentous body.