JPS63122808A - Forcible cooling apparatus of paved asphalt - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides an asphalt paving system that can forcibly cool the asphalt heat in a short period of time during asphalt paving work, thereby shortening the construction period. This relates to a forced cooling device.

(Prior art) As shown in Figure 3, asphalt pavement is usually made by laying basic gravel on top of the subgrade A to form the lower subgrade B, and then placing fine-grained finishing gravel on top of it. After laying the former roadbed C consisting of the former building, a base layer made of coarse-grained asphalt is laid on top of the upper roadbed C, and a surface layer E made of dense-grained asphalt is further paved on top of the base layer.

The asphalt used for such paving work is at a high temperature of 150 to 160 degrees Celsius when it arrives at the site, and even when it is paved and compacted, the surface is around 90 degrees Celsius and the inside is around 140 degrees Celsius. maintains a high temperature. For this reason, in this type of pavement work,
After the base layer has been paved and compaction completed, it is necessary to cool the base layer asphalt once before forming the surface layer E.

However, as a means of cooling this base layer asphalt,
Conventionally, there is no device for forcibly cooling the device, and the reality is that the device relies on natural cooling, which involves leaving the device alone day and night.

When such natural cooling is relied on, the construction period becomes longer, which not only lengthens the period during which traffic is unavailable and causes noise and vibration, but also tends to increase construction costs. Furthermore, since the base layer is left unused for about two days and nights, the surface of the base layer may become uneven due to external causes.

Furthermore, in the case of so-called spot paving that is carried out in conjunction with repair or replacement work for buried pipes F such as gas pipes or water pipes (for example, when paving only the areas that are not shaded in Figure 3), ), a level difference corresponding to the thickness of the surface layer E is created with respect to the road surface G, which poses a danger when driving a vehicle during the daytime during the cooling period, and also causes traffic congestion.

(Purpose) In view of these points, the present invention forcibly cools the heat of asphalt in a short time, shortens the construction period of this type of asphalt pavement work, and thereby solves the various problems described above. Another object of the present invention is to provide a forced cooling device for K11i asphalt, which can obtain the same level of pavement condition as that achieved by natural drying.

(Structure) In order to achieve the above-mentioned object, the present invention includes a water storage tank and a blower mounted on a vehicle, and cools water sent from the storage tank via a pipe line after compaction is completed. It is characterized by the fact that it is equipped with a water sprinkling means for sprinkling water toward the asphalt surface, and a water dispersion means for spraying air sent from the blower onto the asphalt surface to disperse the sprayed water.

(Examples) Hereinafter, the present invention will be described in detail based on illustrated examples.

Fig. 1 shows a forced cooling system for paving asphalt according to an embodiment of the present invention, in which reference numeral 1 denotes a hanging plate 3 which also serves as a rear flap plate of a loading platform 2, which can be raised and lowered towards the road surface, and a lid. - A water storage layer 4 is mounted in front of the loading platform 2, and a blower 5 is mounted in the middle part. The capacity of the water storage tank 4 and the displacement of the blower 5 are appropriately selected depending on the loaded weight of the vehicle 1 and the like.

When the suspension plate 3 is lowered, it is held horizontally with respect to the road surface at a predetermined interval, and a plurality of water spray pipes 6 are installed on the lower surface of the suspension plate 3 along the width direction of the vehicle 1. It is fixed. This water pipe 6 is connected to the water storage tank 4 and the pipe line 7.
A refrigerator 8 is provided in the middle of the pipe 7, and the cooled water is discharged from a nozzle (not shown) of the sprinkler pipe 6 downward, that is, toward the road surface. There is.

Further, a cylindrical air retention chamber 9 is attached to the suspension plate 3 behind the water sprinkling pipe 6 along the width direction of the vehicle 1. This air retention chamber 9 has an air discharge port on the lower surface, and a baffle plate 10 is attached to the rear along this discharge port.

The air retention chamber 9 communicates with one end of a relay hose 11 via a flange pipe, and the other end of the relay hose 11 is connected to the blower 5. It is desirable that a plurality of relay hoses 11 be attached along the longitudinal direction of the air retention chamber 9.

In the drawing, reference numeral 12 indicates a generator similarly mounted on the loading platform 2 of the vehicle 1, and 13 indicates a compressor for a blower.

Next, the state of use of this device will be explained with reference to FIG.

° The figure shows the case of so-called 75 type paving work, in which the lower course base 14 is formed to a thickness of 300 mm, and the upper course base 15 is formed to a thickness of 100 mm, on which coarse-grained asphalt is applied. First, it is laid to a thickness of 100 mm, and it is tightened using a rolling roller, and the same operation is repeated three times to form a base layer 16 with a thickness of 300 mm.

After driving this device onto the surface of this base layer and lowering the suspension plate 3, the valve (not shown) installed in the middle of the cooling water pipe 7 is opened, the operation switch of the blower 5 is turned on, and the vehicle 1 is slowly moved. It runs from one end of the base layer surface to the other end at the same speed.

As the vehicle 1 travels, cooling water is ejected from the nozzle of the water sprinkler pipe 6 to lower the temperature of the asphalt of the base layer 16. At this time, some of the cooling water sprayed onto the hot asphalt becomes steam and diffuses, taking away the heat of vaporization. Although the temperature of the cooling water is not particularly limited, it is set to 2° C. in this embodiment.

Simultaneously with the jetting of the cooling water, air is jetted at a predetermined pressure toward the asphalt surface from the air discharge port of the air retention chamber 9. Since the air outlet is provided at the rear of the water sprinkler pipe 6, the air disperses the cooling water on the asphalt surface.
It promotes the vaporization of cooling water and removes latent heat to evenly cool the asphalt surface. In addition, this air flow is urged in the traveling direction of the vehicle 1 by a baffle plate 10 provided at the rear end of the air outlet, and is efficiently collided with the cooling water, causing the device to travel repeatedly on the asphalt surface -F several times. As a result, the hot asphalt forming the base layer 16 is rapidly cooled. Therefore, asphalt as the surface layer 17 can be laid down in a short period of time after the base fi 16 is launched. In the case of 75 type, this surface layer 17 is 50
The thickness is set to mm. By running the present device on this surface layer 17 as well, the asphalt surface is forcibly cooled in a short time by the action of water and wind. In this way, the asphalt pavement work, which conventionally took two days and nights, was completed in one night. In FIG. 2, numeral 18 is a concrete curb, and 19 is a road shoulder made of asphalt.

By the way, when using this device at night when the temperature is 25℃,
The experimental results for spot paving with an area of 2 are shown below.

Note that the water reservoir 4 used in this experimental example has a capacity of 1.5 t.
And the amount of air sent by the blower 5 is
The speed is 150 m'/min.

From this experimental example, it can be seen that after the base layer 16 and surface layer 17 are laid, the asphalt surface is rapidly cooled by using this apparatus.

In this experiment, roads closed at P, M, 2], 00 will be closed the following day at 8, M, 5. It was possible to open it to OO (
Eight, M.

After 4.05, the time for surface treatment or finishing rolling is added). Moreover, the density and Marshall stability test results after the completion of the paving work were also good, no different from conventional ones (surface temperature 45℃~50℃, softening point 51.5℃).
.

In the above-mentioned embodiment, a truck is used as the vehicle 1, but the present invention is not limited to this. For example, a loading platform may be provided at the rear of the compacting roller vehicle, and forced cooling such as the above-mentioned blower may be provided on the loading platform. If the components of the device are installed, forced cooling of the asphalt surface can be performed simultaneously with compaction.

(Effects) As described above, according to the present invention, since water is sprayed on the asphalt surface after completion of rolling to cool it, the temperature of the asphalt can be lowered in a short time. Moreover, since air is sent toward the asphalt surface immediately after water is sprayed, the water on the asphalt surface can be dispersed appropriately and the asphalt can be cooled evenly, and the asphalt can be rapidly cooled by removing latent heat. It is possible to perform effective cooling. Therefore, after forming one layer made of asphalt, another layer made of asphalt etc. can be immediately paved on top of it without having to wait for two days and nights. This will eliminate the various inconveniences associated with this type of construction.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view of a paved road constructed using this apparatus, and FIG. 3 is a sectional view of a road showing spot paving work. In the figure, 1 is the vehicle, 2 is the loading platform, 3 is the suspension plate, 4 is the water storage tank, 5 is the blower, 6 is the water pipe, 9 is the air retention chamber, 10
is the wind guide plate, 11 is the relay hose, B, 14 is the lower roadbed, C
115 is the upper roadbed, D. Reference numeral 16 indicates the base layer, F, and 17 indicate the surface layer.

Claims (2)

[Claims] (1) The vehicle is equipped with a water storage tank and a blower, and a water sprinkling means for spraying cooling water sent from the storage tank via a pipe toward the asphalt surface after compaction is completed. A forced cooling device for paved asphalt, characterized in that it is also equipped with water dispersion means for spraying air sent from the blower onto the asphalt surface to disperse the sprayed water. (2) A water storage layer and a blower are mounted on the loading platform of the vehicle, and a watering pipe with a large number of watering holes is installed on the lower surface of a hanging board that can be raised and lowered and attached to the rear of the loading platform, and from this watering pipe. 2. The forced cooling device for paving asphalt according to claim 1, further comprising an air discharge nozzle for dispersing discharged water on the asphalt surface.