JPH0220706A - Method and device for cooling pavement material - Google Patents

Abstract

PURPOSE:To effectively accelerate the cooling of pavement by spraying a cooling liquid to a number of locations on the surface of the pavement surface immediately after the pavement being paved and at the same time sending air to the pavement surface on which cooling liquid has been sprayed to accelerate the evaporation of the cooling liquid. CONSTITUTION:A cooling liquid is sprayed at a plurality of locations apart from each other on the surface of a pavement A just after the pavement being paved and at the same time air is sent at a plurality of locations apart from each other on the pavement surface on which cooling liquid has been sprayed to accelerate the evaporation of the cooling liquid sprayed. A cooling apparatus comprises a vehicle body 1, a spray unit 5, a blower 6, a frame 7, an air duct 13, and a spray nozzle mounted on the frame 7. This makes it possible to efficiently cool the pavement.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cooling method and a cooling device for a pavement formed of an asphalt mixture or the like.

<Prior art> Asphalt mixture used as a paving material for roads, etc. is made by heating and mixing materials such as crushed stone, sand, asphalt, etc. in a predetermined ratio. For example, when paving roads, it is usually
The asphalt mixture is spread and compacted at a temperature of 70 to 90°C or higher to form an asphalt pavement.

Furthermore, if the asphalt pavement is used for traffic when its surface temperature is approximately 50°C or higher, the supporting capacity of the asphalt pavement is small, and initial rutting and deformation are likely to occur in the asphalt pavement due to vehicle running. The pavement is opened to traffic when the surface temperature of the pavement becomes less than approximately 50'C.

By the way, when paving a part of the road with traffic restrictions such as road repair work, traffic congestion is likely to occur.
It is necessary to quickly cool the asphalt pavement and lift traffic restrictions as soon as possible.

However, if the asphalt pavement is cooled by natural heat radiation into the atmosphere and the lower layer of the asphalt pavement, the cooling time becomes longer.

For this reason, conventionally, JP-A-60-258302
As shown in the above publication, it has been proposed that spray water is sprayed onto the surface of an asphalt pavement while maintaining a balance with its evaporation, and the asphalt pavement is cooled by the heat of vaporization.

<Problems to be Solved by the Invention> However, in such conventional cooling methods, the cooling efficiency is not sufficiently high, so the cooling time is long and the proportion of the cooling time in the paving work time becomes high. This resulted in problems such as a decrease in paving work efficiency and a longer time until the road was opened to traffic.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cooling method and a cooling device that can greatly improve the cooling efficiency of pavement bodies.

Means for Solving the Problems> Therefore, in claim 1, the present invention provides a method in which the cooling liquid is sprayed at a plurality of spaced apart positions on the surface of the pavement to be cooled, and the cooling liquid is sprayed on the surface of the pavement to be cooled. To provide a method for cooling a pavement body in which air is blown toward the pavement body or at a plurality of positions spaced apart along the surface of the pavement body.

In addition, in claim 2, there is provided a spraying device that sprays the cooling liquid at a plurality of spaced apart locations on the surface of the pavement to be cooled, and a spraying device that sprays the cooling liquid at a plurality of spaced locations on the surface of the pavement to be cooled; To provide a cooling device in which a vehicle is equipped with an air blower that blows air at a plurality of positions.

Furthermore, in a third aspect of the present invention, the blower device according to the second aspect is provided with an air guide device that guides the wind in a predetermined direction.

Effect> The cooling liquid is sprayed onto the pavement from a plurality of positions, and air is blown onto the pavement from a plurality of positions, so that the pavement is cooled by the heat of vaporization of the cooling liquid.

<Example> An example of the present invention will be described below based on FIGS. 1 to 6.

1 and 2, support frames 2 are attached to the front and rear portions of a vehicle body 1, and running wheels 3 are attached to these support frames 2 in a removable manner, respectively. As shown in FIG. 1, these running wheels 3 are each attached to the support frame 2 so as to be freely rotatable in a substantially horizontal plane. Also,
The vehicle body 1 is provided with a power unit 4 that includes a generator that serves as a drive source for various devices, and a spray unit 5 that includes a water tank, a spray pump, and the like. Furthermore, a blower 6 is provided at the bottom of the vehicle body 1 to forcefully feed air.

In addition, a plurality of gate-shaped wheel support frames 7 are arranged in parallel as shown in FIGS. 3 and 4, and wheels 8 are freely movable and rotate in a substantially horizontal plane at the bottom of both ends of these wheel support frames 7. Freely installed.

Here, as shown in FIG. 5, the width of the wheel support frame 7 is set to be slightly wider than the width of the asphalt pavement A to be cooled. Steering devices 9 for changing the direction of each wheel 8 are attached to the lower portions of both ends of each wheel support frame 7, respectively. As shown in FIG. 5, a sprayer 10 of a predetermined length is suspended in the center of each wheel support frame 7, and a plurality of spray nozzles 11 as a spraying device are attached to these sprayers 10 at approximately regular intervals. It is being Water and air are supplied to the spray nozzle 11 as shown in FIG. 6, and the spray nozzle 11 atomizes the water by mixing the water and air and sprays the water.

Here, water and air are supplied to each sprayer 10 from the spray unit 5 via a rubber hose or the like, and water and air are supplied to each spray nozzle 11 via an electromagnetic switching valve (not shown). is supplied.

Further, a flexible sheet member 12 as an air guide device is provided so as to connect the wheel support frames 7 to each other at a predetermined interval and to cover the surface of each wheel support frame 7 and the asphalt pavement A. 12 forms a tunnel-like cavity. Here, the sheet member 12
Both ends of are open.

Further, an air duct 13 made of a flexible member is extended on one side of the sheet member 12, as shown in FIG. . Air is supplied under pressure to the air duct 13 from the blower 6 . Here, the air blower Ia6 and the intake duct 3 constitute the air blower.

During the cooling operation, the sheet member 12 is extended as shown in FIGS. 3 and 4, and has a bellows type structure.

Note that 14 is a frame that holds the seat member 12 in a predetermined shape, and 15 is a spray bar attached to the vehicle body 1.

Next, the effect will be explained.

After placing the running wheels 3 and wheels 8 so as to straddle the asphalt pavement body A to be cooled as shown in FIGS. 4 and 5, the sheet member 12 is placed as shown in FIGS. 3 and 4. The wheel support members 7 are stretched out and arranged at approximately constant intervals. At this time, the running wheels 3 and wheels 8 are rotated by 90 degrees in a substantially horizontal plane, as shown by broken lines in FIG.

Then, while moving the vehicle to the left in FIGS. 3 and 4, water and air are sprayed onto the surface of the asphalt pavement A from each spray nozzle 11. At this time, since air is stirred and mixed into the water, the water is atomized and sprayed. Further, the blower 6 is driven to blow air into the sheet member 12 from each air blowing hole of the air duct 13. Thereby, air is blown inside the sheet member 12 to the asphalt pavement along the surface.

When the asphalt pavement A is cooled in this way, the evaporation of water on the surface of the asphalt pavement A is promoted by the air blowing, so the asphalt pavement A can be efficiently cooled by the heat of vaporization of the water, thereby reducing traffic in a short time. It can contribute to openness and keep traffic restrictions to a minimum. In particular, sheet member 1
2 is extended along the vehicle traveling direction (left and right directions in Figures 3 and 4), the asphalt pavement A at the same position can be cooled for a long time, and the asphalt pavement A can be cooled for a long time. Cooling efficiency can be greatly improved. In addition, since the wheels 8 are arranged so as to straddle the asphalt pavement A to be cooled, when the surface layer of the asphalt pavement is peeled off for maintenance and repair etc. and a new asphalt pavement is laid, the new asphalt pavement is It is possible to cool the pavement without damaging it. Further, since the seat member 12 is formed into a bellows structure, the seat member 12 and the wheel support frame 7 can be folded up as shown in FIG. By rotating it by 90 degrees, it is compact and can be moved to another construction site within the confines of a vehicle.

In addition, in order to improve the cooling effect, a predetermined amount of a surfactant may be added to the spray water.Addition of a surfactant will significantly reduce the surface tension of the water, so the water will spread flatly onto the surface of the asphalt pavement. evaporation of water is promoted,
Cooling efficiency is greatly improved. Specific examples of the surfactant include alcohol, aldehyde, fatty acid disoap, etc., which are available.

Household synthetic detergents are preferably used because of their ease of handling.

<Effects of the Invention> As explained above, in claims 1 and 2 of the present invention, after spraying the cooling liquid at a plurality of positions on the pavement to be cooled, the cooling liquid is sprayed toward the pavement or along the surface of the pavement. Since air is blown at multiple locations, the pavement can be efficiently and quickly cooled by the heat of vaporization of the coolant, reducing the amount of time required for traffic control. Further, in the third aspect, since the air guiding device is provided to guide the air in a predetermined direction, the vaporization of the cooling liquid can be greatly promoted by the air blowing, thereby greatly improving the cooling rate of the pavement.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing one embodiment of the present invention, Fig. 2 is a side view of the same, Figs. 3 and 4 are diagrams for explaining the action of the above, and Fig. 5 is the main part of the same. The sectional view and FIG. 6 are enlarged views of the main parts of the same.

Claims (3)

[Claims] (1) Cooling liquid is sprayed at multiple locations on the surface of the pavement to be cooled, and air is blown toward the pavement on which the cooling fluid has been sprayed or at multiple locations spaced apart along the surface of the pavement. A method for cooling a pavement body, characterized in that the pavement body is cooled mainly by heat of vaporization of a cooling liquid. (2) A spraying device that sprays the cooling liquid at multiple locations spaced apart on the surface of the pavement to be cooled, and a spraying device that sprays the cooling fluid at multiple locations spaced apart from each other toward the pavement where the cooling fluid has been sprayed or along the surface of the pavement. A cooling device for a pavement body, characterized in that a vehicle is equipped with a blower device for blowing air. (3) The pavement cooling device according to claim 2, wherein the blower device includes a wind guide device that guides the wind in a predetermined direction.