JPH0467525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water-permeable pavement suitable for park roads, sidewalks, driveways, passages in buildings, and parking lots.

[Background technology] As a permeable pavement that allows rainwater to permeate downward into a paved road, aggregates 20 such as gravel and crushed stones of different particle sizes are mixed together as shown in Fig. A configuration is used in which the members are bonded to each other with a polymer resin 22 such as epoxy, urethane, or acrylic resin with gaps.

In this configuration, since the aggregates 20 of different particle sizes are interlocked with each other, the bonding force is strong and the aggregates 20 have excellent bending strength, tensile strength, compressive strength, and impact resistance. However, since the voids between the aggregates are small,
It is easily clogged with sand and dust, making it difficult to maintain stable water permeability over a long period of time.

On the other hand, as shown in Fig. 3, a pavement structure in which aggregates 30 such as gravel or crushed stones of a single particle size are bonded with a similar polymer resin 32 with partial gaps between them has also been used. There is. In this case, since the voids between the aggregates are large, clogging is less likely to occur and water permeability can be maintained over a long period of time. However, since the particle sizes of the aggregates are approximately the same, the bonding area is narrow, the bonding strength between the aggregates is weak, and the durability is poor.

The present invention takes the above facts into consideration and aims to provide a water permeable pavement that can maintain long-term water permeability and strength.

[Structure and operation of the invention] According to the present invention, small-diameter aggregates are bonded around single-grain large-diameter aggregates using a polymer resin, and the large-diameter aggregates are bonded to each other through the small-diameter aggregates and the polymer resin. It is characterized by adhesion.

Therefore, in the present invention, the small-diameter aggregates arranged around the large-diameter aggregates increase the adhesive area between the large-diameter aggregates, thereby improving the adhesive strength of the large-diameter aggregates. Furthermore, since the large-diameter aggregates have a single particle size, gaps are partially ensured between the large-diameter aggregates, and these gaps allow water permeability to be maintained over a long period of time.

Here, the term "single particle size" refers to a particle size difference of 5 times or less (preferably 3 times or less); if the particle size difference is larger than this, the gaps between the aggregates become narrower and water permeability decreases. In addition, the outer diameter ratio of large-diameter aggregate and small-diameter aggregate must be 20 times or more (preferably 30 times or more).
If it is less than this, the gap will become narrower.

[Embodiments of the Invention] FIG. 1 shows an enlarged sectional view of a water-permeable pavement to which the present invention is applied.

The large-diameter aggregate 10 with a single particle size is almost uniformly surrounded by powder particles 12 that are small-diameter aggregates, and these powder particles 12 are surrounded by the large-diameter aggregate 10 by the polymer resin 14. is glued to. Therefore, the large-diameter aggregate 10 is surrounded by the polymer resin 14.

Moreover, a large number of large-diameter aggregates 10 are composed of these powder particles 12.
Parts of the parts are in close contact with each other via the polymer resin 14, and are fixed to each other after the polymer resin 14 is solidified.

Moreover, since only some of the large diameter aggregates 10 are bonded to adjacent large diameter aggregates 10, voids 16 are formed between them.

As the large-diameter aggregate 10, crushed stone No. 5 (20 to 13 mm), No. 6 (13 to 5 mm), and No. 7 (5 to 5 mm) specified by JIS are used.
2.5mm) or natural aggregate of equivalent size can be applied.

In addition, hard fine particles such as river sand, sea sand, silica sand, and ceramics are suitable for the powder 12, and silica sand No. 4 (0.3 to 0.6 mm) and No. 5 (0.15 to 0.3 mm) are specified by JIS.
mm), No. 6 (0.074 to 0.15 mm), No. 7 (0.074 mm or less)
etc., and is preferably used in an amount of 5 to 15% by weight of the weight of the large-diameter aggregate 10. As the polymer resin 14, a polymer resin such as a room temperature curable epoxy resin can be used.

In addition, when constructing this permeable pavement, aggregate,
After measuring and adjusting the particle size distribution and specific gravity of the powder, the large-diameter aggregate is mixed in a concrete mixer for several minutes (for example, for 2 minutes) to eliminate unevenness in particle size. Thereafter, the required amount of epoxy resin is added and mixed for several minutes (for example, 2 minutes) to uniformly adhere the resin around the large-diameter aggregate.

If the granular material is added and mixed here, the granular material will adhere uniformly around the large-diameter aggregate, so it is sufficient to lay it down and cure it after finishing with a trowel.

In the water permeable pavement of this embodiment constructed in this way, the adhesion area between the large-diameter aggregates 10 and the granular material 12 by the polymer resin is significantly increased compared to the conventional pavement (see Fig. 3). , it becomes a material with excellent durability and strength. The content of the polymer resin 14 increases in proportion to the surface area of the large-diameter aggregate 10.

Furthermore, since voids 16 are formed between the large-diameter aggregates 10, water permeability can be maintained over a long period of time. In particular, the powder 12 prevents ultraviolet rays from passing into the interior of the pavement, thereby preventing deterioration of the polymer resin 14 and improving the sustainability of water permeability.

Furthermore, since it has become possible to use large-diameter aggregate 10 with a larger particle size than before for park roads, sidewalks, etc., it has become possible to obtain a natural landscape and feel similar to that of gravel sidewalks. Furthermore, since the surface roughness of the pavement becomes rougher, pedestrians and vehicles will experience fewer slips even when the road surface is wet due to rain or the like. Furthermore, since the powder 12 is applied to the pavement surface, the artificial surface gloss characteristic of polymer resins is eliminated, making it suitable for areas where aesthetics are important, such as gardens and entrances to buildings, and for painting the walls of buildings. has also become applicable.

[Effects of the Invention] As explained above, the present invention adheres small-diameter aggregates around single-grain large-diameter aggregates with a polymer resin, and bonds each large-diameter aggregate through these small-diameter aggregates and polymer resin. Since it is characterized by adhesion to each other, it has an excellent effect of maintaining long-term water permeability and strength.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the water-permeable pavement of the present invention, and FIGS. 2 and 3 are sectional views showing conventional water-permeable pavement. 10... Large diameter aggregate, 12... Powder, 14...
Polymer resin, 16... void.

Claims (1)

[Claims] 1. A water-permeable pavement characterized by bonding small-diameter aggregates around single-grain large-diameter aggregates with a polymer resin, and bonding the large-diameter aggregates to each other via the small-diameter aggregates and the polymer resin. .