JP3574105B2 - Anti-freezing pavement structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a freeze-control pavement structure capable of continuously suppressing road surface freezing over a long period of time by leaching a snow-melting agent liquid into a road on which road surface freezing occurs in a cold season.
[0002]
[Prior art]
On roads where the road surface freezes during the cold season, a granular snow melting agent is sprayed on the road surface just before freezing is expected, or a snow melting agent liquid is sprayed on the road surface surface of the water-retaining pavement and stored in the pavement, Freeze suppression is achieved by leaching water retention milk by capillary action.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned method, it is necessary to spray the snow-melting agent (liquid) periodically. For example, even in the method of storing the snow-melting agent liquid on the water-retaining pavement, the freeze-prevention function has a continuity of about 7 days. Even if sprayed on the vehicle tires, they adhere to the car tires and are wasted.
Therefore, an object of the present invention is to propose a pavement structure capable of continuously suppressing road surface freezing over a long period of time.
[0004]
[Means for Solving the Problems]
The present invention has been proposed in view of the above, and has a storage portion of a snow melting agent liquid including a plurality of water retention columns provided on the impermeable layer, and a roadbed material having a capillary action provided on the storage portion. A certain base layer and a surface layer constructed by water-retentive pavement on the base layer, and the snow-melting agent liquid stored in the storage part is supplied to the surface layer from the water-retention support column through the base layer by capillary action. The present invention relates to an antifreezing pavement structure.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
The water-retentive pavement structure of the present invention comprises (1) a water-blocking layer, (2) a storage section, (3) a base layer, and (4) a surface layer in order from the bottom, and the respective structures will be described below.
[0006]
The water-blocking layer in the present invention may be various water-blocking sheets or asphalt pavement, and the specific configuration thereof is not particularly limited as long as it can store the snow melting agent liquid in a storage section provided on the upper surface thereof.
[0007]
(2) In the present invention, the storage section has a load resistance capable of withstanding a load above it (including a passing vehicle load) and a space having a capacity as large as possible, except for a configuration having a plurality of water retention columns. The specific configuration is not particularly limited as long as it is possible. As a preferred example, a plastic filler such as polypropylene (PP) is used, in which a unit including a top plate and a plurality of vertical pipes is vertically and horizontally adjacent to each other and side plates are provided on the outer periphery thereof. be able to.
[0008]
The plurality of water retention columns provided in the storage portion serve to supply the snow melting agent liquid stored in the storage portion to the upper base layer by capillary action and to support the bottom surface of the upper base layer. It is possible to use a pillar in which a cement mortar, a soil cement, a sandy soil, a water-absorbing material, or the like having a water retention property is filled in a plastic pipe described above.
[0009]
The (3) base layer in the present invention is made of a roadbed material having a capillary action, and a capillary for receiving the snow melting agent liquid rising from the lower water retention pillar by the capillary action and further leading to the upper water retention pavement. The specific configuration is not particularly limited as long as it has an action. For example, cement mortar or soil cement obtained by solidifying crushed stone, sand, excavated soil, or the like using cement or a cement-based solidifying material may be used, and a water absorbing material such as sludge, silt, sepiolite, artificial zeolite, or plant fiber may be mixed.
[0010]
The surface layer (4) in the present invention is formed by constructing a water-retentive pavement.
The water-retentive pavement in the surface layer is not particularly limited to a specific configuration. For example, a pavement in which a water-retentive cement milk having a water content of about 50% is injected into voids of an open-grain asphalt mixture for semi-flexible pavement is used. be able to.
[0011]
Further, as the snow melting agent liquid stored in the storage unit (2), an aqueous solution of calcium chloride, sodium chloride, formic acid, potassium acetate, or the like is used, but is not limited thereto. When the amount of the snow-melting agent is insufficient, it may be appropriately replenished. For example, an injection hole is formed in the surface layer and the base layer, and the snow-melting agent is injected from there, or the remaining amount is checked. Good.
[0012]
The freeze-preventing pavement structure of the present invention comprising the (1) impermeable layer, (2) storage section, (3) base layer, and (4) surface layer has the following features: (2) the snow melting agent liquid stored in the storage section is a capillary tube; By the action, water is supplied from the water retention pillar to the surface water retention pavement of the surface layer via the base layer. Therefore, it is not necessary to spray the snow melting agent liquid frequently, and the road surface freezing suppressing function can be continuously maintained for a long period of time.
[0013]
(2) By providing a layer of a heat insulating material such as expanded styrene beads or rice hulls in the storage section, it is possible to suppress a decrease in the temperature of the pavement body. Further, for the same effect, the adjacent manhole tank and (2) the storage unit may be connected.
[0014]
Furthermore, when it is desired to prevent the road surface temperature from rising during the daytime in the summer, water containing no snow melting agent is stored in the storage part, and the water is leached out of the water-retentive pavement portion by a capillary action to evaporate the water. Road surface cooling may be achieved by latent heat. In this case, there is no need to repeat the spraying work regularly and frequently as in the method of spraying water on the road surface, and it is possible to prevent the rise of the road surface temperature continuously over a long period of time, and to prevent the heat island phenomenon and the like in urban areas. It can serve to improve the thermal environment.
[0015]
In addition, by replacing a part of the surface water-retentive pavement with the water-permeable pavement and using a water-permeable roadbed material having a water-permeability as the base layer, rainwater can be positively taken into the storage portion.
[0016]
【Example】
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view showing a part of one embodiment of the freeze-preventing pavement structure of the present invention, and is composed of a water-blocking layer 1, a reservoir 2, a base layer 3, and a surface layer 4 in order from the bottom.
[0017]
The illustrated embodiment is an example in which the present invention is applied to a road on which freezing easily occurs, and the impermeable layer 1 laid on the inner surface of the excavation groove may be an impermeable sheet or asphalt pavement.
[0018]
A plastic storage tank having a pressure resistance of 30 tf / m ² is used as the storage section 2 thereon, and a plurality of vertical pipes made of PP in the plastic storage tank are filled with soil cement having the following composition to hold the water-retaining posts. It was set to 5.
No. 6 crushed stone 60%, No. 7 crushed stone 10%, cement 4%, sepiolite 4%
SC: 30%
Wet density: 2.20 t / m ³ (compacting: 3 layers each 10 times)
Optimal water content: 8%
Permeability: 1 × 10 ⁻³ cm / sec
[0019]
Subsequently, as the base layer 3, a roadbed material having a capillary action by applying the above-mentioned soil cement to a thickness of about 100 mm was constructed.
[0020]
Then, a water-retentive pavement was constructed to form the surface layer 4. Specifically, after laying a 50-mm-thick open-grain asphalt mixture for semi-flexible pavement, water-retaining cement milk was sprayed and injected. Finally, a snow melting agent liquid 7 composed of an aqueous solution of calcium chloride was injected into the storage section 2 through the injection hole 6 and stored.
[0021]
In the freeze-preventing pavement structure of the present invention constructed in this manner, the snow-melting agent liquid 6 stored in the storage section 2 rises on the water-retaining pillar 5 by capillary action and is supplied to the surface layer 4 through the base layer 3. Freezing suppression is performed over a period. This function of suppressing freezing continues as long as the snow-melting agent liquid remains in the storage unit 2. However, if the snow-melting agent liquid 7 in the storage unit 2 is consumed, the snow-melting agent liquid is sprinkled. By injecting and storing excess snow-melting agent liquid into the storage section 2 from the injection hole 6, the above-described function can be restored without frequent spraying of the snow-melting agent liquid. Further, in the illustrated embodiment, a layer of a heat insulating material 8 such as expanded styrene beads or rice hulls is provided in the storage section 2 and the storage section 2 is connected to the manhole tank 9 to suppress a decrease in the temperature of the pavement body.
[0022]
Further, although not shown, if a part of the surface layer 4 is replaced with permeable pavement, rainwater can be positively introduced into the storage unit 2 from the permeable pavement during the daytime in summer or the like. There is no need to add a snow melting agent, and this water is leached out of the water-retentive pavement by the capillary action, and the road surface can be cooled by the latent heat of evaporation of the water.
Thus, the main purpose of the freeze-control pavement structure of the present invention is to suppress road surface freezing in the cold season, but it is also possible to achieve cooling of the road surface during the daytime in summer, etc. ) Can be used as a paved road.
[0023]
【The invention's effect】
As described above, the freeze-suppressing pavement structure of the present invention supplies the snow-melting agent liquid stored in the storage section to the surface water-retaining pavement through the base layer from the water-retaining column through the capillary action, thereby suppressing road surface freezing. it can. Moreover, this function is not lost in a short period of time as in the conventional method of spraying a snow-melting agent solution on a water-retentive pavement, and does not require maintenance such as regular spraying, and is performed over a long period of time. The function can be continuously maintained.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a part of an embodiment of a freeze-preventing pavement structure of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water barrier 2 Water storage part 3 Base layer 4 Surface layer 5 Water retention pillar 6 Injection hole 7 Snow melting agent liquid

Claims (1)

A storage portion for a snow melting agent liquid provided with a plurality of water retention columns provided on the water shielding layer, a base layer having a capillary action provided on the storage portion, and a water retention pavement on the base layer The snow-melting agent liquid stored in the storage section is supplied to the surface layer from the water-retentive support column through the base layer by capillary action, and the surface is constructed by the above-mentioned method.

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