JPH02304102A - Water permeable sand paving formed by reinforced sand layer structure plate - Google Patents

Abstract

PURPOSE:To make use of water permeability which is characteristic to sand, to improve the dynamic instability, and to widen the application range of sand by filling a network solid structure plate molded by fibrous synthetic resin with sand, and compacting the same. CONSTITUTION:A filter material 2 made of nonwoven fabric of synthetic resin is laid on a roadbed 1, and a network solid structure plate 3 which is formed by sticking or welding wrinkled or curled fire-resistant fibers of synthetic resin such as vinylidene chloride to each other is stacked thereon in such a manner that the lower and side surface portions thereof are wrapped up in the filter material 2. The plate 3 is then filled with dried sand 4, and, subjected to vibration compaction using a vibrator or the like to lay water permeable sand paving. Or a colored structure plate 3 is filled with sand 4 to such a degree that the surface layer portion is exposed, and color dressed and is sprayed and compacted by vibration to achieve color paving.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a permeable sand pavement comprising a reinforced sand layer structure plate.

Especially park plazas, sidewalks, seaside promenades, and parking lots.

It is also suitable for pavements that require elasticity and water permeability, such as walkways and rest areas at pool sites, indoor and outdoor playgrounds at schools and other sports facilities, courts, and golf course teeing grounds, and can be paved as colored pavement. This paper relates to permeable sand pavement consisting of sand layer structure.

[Conventional technology]

Conventionally, sand as a civil engineering material has generally been used as fine aggregate for cement concrete, asphalt concrete, and the like. In other words, it is used as one of the materials constituting composite materials such as cement concrete and asphalt concrete. Of course, it is also used as a single material in barrier layers in soft roadbed improvement methods and sand mat layers for embankments, but its main field of use is still in composite materials such as cement concrete. The current situation is that

[Problem to be solved by the invention]

Incidentally, the sand used in the above-mentioned composite materials and the like has an extremely stable material property, and is particularly characterized by outstanding water permeability.

However, it has the disadvantage that it is difficult to increase the density using ordinary compaction construction machines, and it is weak in strength. In other words, it has the disadvantage of being mechanically unstable. As a result, the current use of sand as a civil engineering material is relatively limited as described above.

This invention aims to expand the use of sand,
This permeable sand pavement is made of a new reinforced sand layer structure that takes advantage of the characteristics of sand as a civil engineering material, namely its stability and permeability, while also strengthening and stabilizing its weaknesses in strength and mechanical instability. The purpose is to provide the following.

In particular, park plazas and promenades, seaside promenades, parking lots, poolside walkways and rest areas, and indoor and outdoor playgrounds at schools and other sports facilities.

To provide a water-permeable sand pavement made of a reinforced sand layer structure plate that can be paved as a pavement requiring elasticity and water-permeability functions such as a court or a golf course teeing ground, or as a color pavement. This is what it aims to do.

[Means to solve the problem]

As a means for achieving the above object, the present invention provides (1)
A mesh-like three-dimensional structure plate is formed by adhering or welding flame-retardant fibrous synthetic resin with wrinkles and curls to each other on a synthetic fiber non-woven fabric as a filter material. This is a permeable sand pavement consisting of a reinforced sand layer structure that is laid on the roadbed, filled with sand, and then compacted by vibration.

(2) In addition, the amount of sand filled in the mesh three-dimensional structure slab laid on the roadbed is reduced, and the surface layer of the mesh three-dimensional structure slab is exposed. It's what I did.

(3) Furthermore, either the surface layer of the mesh three-dimensional structure plate is molded with pre-dyed fibrous synthetic resin, or the surface layer of the mesh three-dimensional structure plate after molding is colored, and then colored makeup is applied. This is a permeable sand pavement consisting of a reinforced sand layer structure plate filled with sand and compacted by vibration.

[Effect]

As explained above, the permeable sand pavement according to the present invention is a pavement made by filling sand into a mesh three-dimensional structural plate molded with fibrous synthetic resin and compacting it, so the water permeability function of the sand is sufficiently ensured. However, the weakness of strength and the resulting mechanical instability, which were considered to be disadvantages of sand, can be reinforced by a mesh-like three-dimensional structure, and if the pavement is made with the surface layer of the mesh-like three-dimensional structure exposed. , it also exhibits elasticity as a pavement.

Furthermore, if the fibrous synthetic resin that makes up the mesh three-dimensional structure plate and the sand that is filled in are colored using methods such as dyeing or color painting, it is possible to obtain extremely colorful colored pavement with water permeability and elasticity. I can do it.

〔Example〕

Next, the present invention will be specifically explained through examples.

First, the permeable sand pavement made of a mesh three-dimensional structure plate according to the present invention is constructed using the following main materials.

1) Filter material This material covers the bottom and sides of the mesh three-dimensional structure plate, which will be explained in 2) below, and prevents the filler sand filled in the mesh three-dimensional structure plate from flowing out, and also protects the mesh three-dimensional structure plate. This is to function as a joint.

The material is a synthetic fiber non-woven fabric with good water permeability and a thickness of about 2 to 5 mm.

2) The mesh three-dimensional structure strengthens the mechanical instability of sand, and is made by bonding flame-retardant fibrous synthetic resin with wrinkles and curls to each other using fibrous synthetic resin and super-strong twist processing. It is glued or welded and molded into a plate shape.

The material of the mesh three-dimensional structure plate used in this example is molded from a flame-retardant fibrous synthetic resin such as vinylidene chloride. The thickness of the fibers was determined depending on the purpose of paving, that is, the degree of water permeability and elasticity, and the porosity was set at about 98 to 88% regardless of the thickness of the fibers.

In addition, as a means to obtain the effect of color paving which will be described later, in this example, the fibrous synthetic resin was dyed at the raw material stage. Of course, after the mesh-like three-dimensional structure plate is molded, the surface layer portion thereof may be colored by color coating.

3) Sand Two types of sand were used to fill the mesh three-dimensional structure plate: sand to be used as filling sand and decorative sand to obtain the effect of colored pavement.

First, as filler sand, use river sand or lake sand.

Natural aggregates such as sea sand, dune sand, volcanic gravel, and silica sand.

We decided to use sand made from artificial aggregates such as washed sand and slag.

In order to make the permeability coefficient K of the pavement 10-3 or more,
The maximum particle size is 2 mm or less and the fine particle content (silt viscous content) is 5%.
"Beautiful sand [S]" according to the Japanese unified soil classification method before and after
Sand with a particle size distribution classified as .

However, the water permeability is reduced by the above water permeability coefficient, and 10
- If 10-4 is acceptable, the maximum particle size is 2mm.
The fine grain content (silt content) is 5% or more and less than 15%, which is classified as "fine grain mixed sand (SF)" according to the Japan Unified Soil Classification Method.
It was decided to use sand with a particle size distribution that could be separated into J.

Next, as decorative sand for colored pavement, use natural aggregates such as volcanic gravel and diabase ash, and colored silica sand, zeolite impregnated with pigments, colored ceramics, and carborundum.

We decided to use artificial aggregates such as colored glass beads and colored plastic pieces.

The material for the decorative sand used was the same as the filling sand described above. In other words, if the permeability coefficient K of the pavement is 10-' or more, the particle size distribution is classified as so-called "clean sand [S]" with a maximum particle size of 2 mm or less and a fine particle content (silt clay content) of around 5%. The water permeability coefficient K is 10.
If -3 to 10-4 is acceptable, the maximum particle size is 2 mm.
In the following, a material with a particle size distribution classified as so-called [fine-grain mixed sand (SF) J] with a fine-grain content (silt, clay content) of 5% or more and less than 15% was used.

In addition, it was decided to use dry-treated sand for both filling sand and decorative sand in order to facilitate injection and filling into the mesh three-dimensional structure plate.

(Construction method) Paving was carried out using the above-mentioned main materials in the following manner.

(1) In the case of standard permeable sand pavement (see Figure 1) First, a filter material 2 made of synthetic fiber non-woven fabric is laid on the roadbed 1 to be paved, and the rope-shaped three-dimensional structure plate 3 is placed on top of it. Stack. At this time, the filter material 2 is used to wrap the lower part and side portions of the mesh three-dimensional structure plates 3, and the side portions are made to form joints between adjacent mesh three-dimensional structure plates 3.

Next, dry filler sand 4 is injected into the laid and laminated mesh three-dimensional structure plate 3. Then, it is lightly vibrated compacted using a small pie break (vibro plate or small vibrating roller). Then, the filling sand 4 flows into every corner of the mesh three-dimensional structure plate 3 and is easily filled in a short time. The filled sand 4 is a mesh three-dimensional structure plate 3.
A permeable sand pavement consisting of a reinforced sand layer structure plate 5 which is internally subdivided, compacted uniformly and tightly, integrated with a mesh three-dimensional structure plate 3, and reinforced by the so-called mesh three-dimensional structure plate 3. will be established.

(2) In the case of colored permeable sand pavement (see Figure 2) When paving as colored pavement, the fibrous synthetic resin that forms the mesh three-dimensional structure 3 is colored in advance by dyeing or other means. The colored material is then molded into a structural plate, or the surface layer after molding is colored and then laminated on top of the filter material 2 in the same manner as in the case of FIG. 1.

Then, filling sand 4 is first injected into the laminated mesh-like three-dimensional structure plate 3. At this time, the injection amount is reduced so that the surface layer 6 of the mesh three-dimensional structure plate 3 is exposed. After that, decorative sand 4a is sprinkled thereon, and as before, it is lightly compacted by vibrating using a small pie break or the like.

(3) In the case of permeable sand pavement with elasticity (see Figure 3) When imparting elasticity to the pavement, the surface layer 6 of the mesh three-dimensional structure plate 3 is exposed after being subjected to seismic compaction treatment. It will be paved as it is. In other words, the filling rate of the sand network three-dimensional structure plate 3 is reduced.

In addition, 7 shown in Fig. 1, Fig. 2, and Fig. 3 is the ground, and 8
9 is a drain for permeated water, and 9 is a filter layer.

As a result of paving according to the above-mentioned construction method, the sand is uniformly and tightly packed and compacted between the lattices of the mesh three-dimensional structure plate, forming a so-called reinforced sand layer structure plate, and the movement of sand particles is prevented. It is restrained and can exhibit strength and stability without impairing the water permeability of the pavement. Furthermore, experiments have shown that the water permeability of pavement is ensured in both dry and wet conditions, and depending on the selection of sand grain size for filling, a large water permeability function with a permeability coefficient of ≧I x 10-3 can be maintained. was completed.

In addition, the CBR value (index indicating the bearing capacity of the roadbed and roadbed) is 20.
It has a strong supporting force equivalent to ~30% of granular material, and the angle of repose is θ=50° in dry state and θ-70° in wet state.
It was found that it has the function of a permeable sand pavement that is large and mechanically stable.

〔Effect of the invention〕

1) Effectiveness as a paving material ■ The mesh three-dimensional structure plate, which reinforces the shortcomings of sand and maintains mechanical stability, is extremely lightweight because it is molded using so-called fibrous synthetic resin. It is easy to transport and lay by hand, and can be laid without the need for particularly large construction machinery.

In addition, even complex on-site shapes can be easily adjusted to on-site dimensions using a utility knife or scissors, allowing for quick cutting and shaping.

Furthermore, if the installation surface has undulations or slopes, the filter material and the mesh three-dimensional structure plate can be glued together and fixed to the roadbed or the ground with nails, so it is highly adaptable to the installation surface. Furthermore, the difference in level between the joints of the mesh three-dimensional structure plates can be easily corrected using a hot metal trowel.

■ Since it is easy to color (paint) the mesh three-dimensional structure, after the mesh three-dimensional structure is temporarily assembled on-site, the mesh three-dimensional structure is removed from the paving surface and the designer can design freely. It is possible to apply a satisfactory coating and then install it.

In other words, extremely colorful pavement can be created.

■ Local materials can be used for filling sand, reducing paving costs.

2) Advantages in construction ■ Compared to asphalt pavement or concrete pavement, no special skills or experience are required, and construction costs can be kept extremely low.

■ Construction is done using the so-called laying method, which does not require any special large-scale paving equipment, so the laying time can be shortened.

In addition, since it is possible to shape the complex site shape using a cutter knife or scissors as described above, the installation itself can be carried out quickly.

■ The porosity of the installed mesh three-dimensional structure plate is 98 ~
It is large at 88%, and since the sand to be poured is dry sand, the fluidity of the sand is exhibited, and as a result, the sand pouring work can be carried out in a short time and by a small number of people.

■ Compaction can be done using a vibro plate or a small vibrating roller and does not require a large compaction machine. Therefore, relative construction costs can be reduced.

3) Advantages as a pavement■ First of all, it basically has high water permeability as a pavement. In particular, the reinforced sand layer structure allows for high drainage in the vertical direction, making it less likely to be eroded by surface water. In addition, even if raindrops fall from tree tops or other structures surrounding the pavement, there will be no local erosion. Therefore, it has high weather resistance as a pavement.

■ Due to its high water permeability, sand frost heave is less likely to occur. Even in the event of frost heaving or freezing, it is a water-permeable sand pavement made of a reinforced sand layer structure because it has a composite structure of sand and a mesh three-dimensional structure made of fibrous synthetic resin as a reinforcing material. Therefore, pavement damage due to cracks etc. will not occur.

Also, because it has a composite structure of a mesh three-dimensional structure plate and sand, it has a high supporting capacity. Moreover, because the injected sand has a large angle of repose, it functions not only as a slope pavement but also as a mechanically stable pavement.

■ If the amount of sand packed into the mesh three-dimensional structure slab is reduced and the surface layer of the mesh three-dimensional structure slab is exposed, the pavement will function as an extremely elastic pavement. The fibrous synthetic resin that makes up the mesh three-dimensional structure plate is flame retardant, so there is no risk of it catching fire with cigarette butts.

■ Since it is easy to color, it is possible to obtain colorful pavement with a variety of color combinations.

As explained above, the permeable sand pavement made of the reinforced sand layer structure according to the present invention has not only water permeability but also mechanical stability as a pavement, as well as excellent elasticity and colorability. Because it takes advantage of the advantages and covers the disadvantages, it can be used not only in park plazas, walking paths, seaside promenades, parking lots or poolside passages and rest areas, indoor and outdoor playgrounds at schools and other sports facilities, but also courts and golf courses. It has extremely wide adaptability as a pavement for teeing grounds, etc.

Furthermore, the permeable sand pavement according to the present invention has extremely high water permeability as described above, and also has a so-called filtration function. , it can return high-quality moisture to the soil, and it can also be used as a means of obtaining clean water in remote islands that rely on rainwater for drinking water.

[Brief explanation of drawings]

The drawings show an example of a permeable sand pavement made of a reinforced sand layer structure version according to the present invention. A cross-sectional view of a pavement constructed as a colored permeable sand pavement with a reduced filling amount and a color coating applied to the surface layer of the mesh three-dimensional structure. Figure 3 is a cross-sectional view of a pavement constructed as a resilient permeable sand pavement. It is a diagram. 1... Roadbed 2... Filter material (synthetic fiber non-woven fabric) 3... Mesh three-dimensional structure version 4... Sand filled in the mesh three-dimensional structure version 5... Reinforced sand layer region 6... Mesh Exposed surface part of the three-dimensional structure plate (unfilled part with sand) 7... Ground 8... Drain (porous pipe wrapped with filter material) 9
...filter layer standard permeable sand pavement made of crushed stone or rough sand

Claims (3)

[Claims] (1) A mesh-like three-dimensional structure plate made by adhering or welding flame-retardant fibrous synthetic resin with wrinkles and curls to each other is laminated on a synthetic fiber non-woven fabric as a filter material. A permeable sand pavement consisting of a reinforced sand layer structural slab, characterized in that the structural slab is laid on the roadbed, and the mesh three-dimensional structural slab is filled with sand and then compacted by vibration. (2) Permeable sand made of reinforced sand layer structure slab according to claim 1, wherein the amount of sand packed into the mesh three-dimensional structure slab laid on the roadbed is reduced so that the surface layer of the mesh three-dimensional structure slab is exposed. pavement. (3) Either the surface layer of the mesh three-dimensional structure plate is molded with pre-dyed fibrous synthetic resin, or the surface layer of the mesh three-dimensional structure plate after molding is colored, and then colored sand is applied. A permeable sand pavement comprising the reinforced sand layer structure plate according to claims 1 and 2, which is filled and compacted by vibration.