JPH0571040U - Carrier for transporting hot asphalt mixture - Google Patents

Abstract

(57) [Summary] [Purpose] When loading and transporting asphalt mixture on a carrier, the purpose is to suppress temperature drop during the transportation process. [Structure] A heat insulating material is attached to the outside of the wall surface forming the cargo bed. Even if the temperature of the wall surface rises due to the heat from the asphalt mixture, the provision of the heat insulating material prevents the temperature of the wall surface from lowering due to the blowing of air during traveling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carrier for transporting hot asphalt mixture.

[0002]

[Prior Art]

 As is well known, hot asphalt mixture used for road paving is manufactured in an asphalt mixture plant, and immediately or after being stored in a warm storage tank, it is transported to a construction site by a dump truck. The mixture produced in the plant initially has a temperature of about 170 ° C, and it is required to be 140 ° C or higher at the time of construction.

By the way, when the construction site is far away from the composite material plant or due to traffic congestion, it may take a long time for the dump truck loaded with the asphalt composite material to arrive at the construction site. As a result, the temperature of the asphalt mixture will drop, and it may not be possible to carry out construction depending on the required temperature.

As a means for avoiding this, it has been proposed to make the loading platform of the dump truck a closed structure or to cover the surface of the asphalt mixture loaded on the loading platform with a sheet. All of these means are intended to avoid direct contact of the asphalt mixture with the outside air and to reduce convective heat transfer to the air.

However, these means do not give any consideration to convective heat transfer from the wall surface of the cargo bed. That is, this kind of wall surface is usually made of an iron plate. Then, the asphalt mixture loaded on the bed is crimped to part or all of the side walls, bottom wall, front wall and back wall by its own weight. Due to this crimping, the heat of the asphalt mixture is transferred to these wall surfaces by conduction.

Therefore, the wall surface in contact with the asphalt mixture has a temperature close to the temperature of the asphalt mixture. Air is blown onto this wall surface at high speed by the traveling of the dump truck, so that the wall surface is cooled. Therefore, a large amount of heat is transferred from the asphalt mixture to the wall surface, resulting in a decrease in the temperature of the asphalt mixture. Conventionally, no measures have been taken to reduce the temperature of the asphalt mixture due to such cooling of the wall surface.

[0007]

[Problems to be solved by the device]

 An object of the present invention is to prevent the temperature of the asphalt mixture from lowering due to the wall surface of the platform being cooled by traveling when the asphalt mixture is carried on a carrier.

[0008]

[Means for Solving the Problems]

 The present invention is characterized in that a heat insulating material is attached to one or both of the outer surface and the inner surface of a part or all of the wall surfaces that make up the loaded asphalt mixture, of the wall surfaces forming the cargo bed.

[0009]

[Action]

 When the loaded asphalt mixture comes into contact with the wall surface of the cargo bed, the temperature of the wall surface rises, but since the heat insulating material is attached to one or both of the outer surface and the inner surface, the heat insulating effect of the heat insulating material is achieved. This reduces convective heat transfer from the wall to the outside. This makes it possible to sufficiently reduce the temperature drop of the asphalt mixture.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a dump truck, which is composed of a driver's cab 2, a vehicle body 3, a cargo bed 4, and the like. The loading platform 4 is tiltable with respect to the vehicle body 3 and is configured to unload a load by this leaning. The loading platform 4 is composed of side walls 5, a bottom wall 6, a freely openable back wall 7 and a front wall 7A. Reference numeral 8 is a reinforcing frame for each wall.

Although these configurations are not particularly different from those of an ordinary dump truck, in accordance with the present invention, a part or all of the wall surface with which the asphalt mixture mounted on the luggage carrier 4 comes into contact with one of the outer surface and the inner surface Alternatively, the heat insulating material 9 is attached to both of them. As the heat insulating material 9, any material can be used, but, for example, a corrugated board, a non-woven sheet, etc. can be used. In the case of corrugated cardboard, an air layer is formed inside the corrugated board, which is advantageous because the heat retaining effect of the air is large.

The example of the figure shows a structure in which a heat insulating material 9 is attached to the outer surfaces of the side wall 5 and the back wall 7. The heat insulating material 9 may be attached to the outer surface of the bottom wall 6, but since the outer surface of the bottom wall 6 is always facing the vehicle body 3 and does not come into contact with the outside air much during traveling, heat radiation from here Since it is considered to be small, the heat insulating material 9 should be attached only when necessary.

According to the above configuration, when the dump truck travels with the asphalt mixture loaded on the luggage carrier 4, the asphalt mixture comes into contact with the side wall 5, back wall 7, front wall 7A, etc. of the luggage carrier. Even if the temperature of the wall surface rises, since the heat insulating material 9 is attached to the outer surface of the wall surface, the heat insulating effect of the heat insulating material reduces the convective heat transfer from the wall surfaces to the outside. This can reduce the decrease in temperature of the asphalt mixture.

Further, in the traveling state, even if the air is blown to the wall surface at a high speed, the air blows the heat insulating material, and even if the temperature of the surface of the heat insulating material decreases, the heat insulating effect of the air keeps Prevents the temperature from dropping.

In the case where each wall has a reinforcing frame 8, if a heat insulating material 9 is attached to the outer surface of the reinforcing frame 8 as shown in FIG. It is convenient that air is present in the enclosed space 10, and this air further enhances the heat retention effect.

In practice, it is advisable to cover the surface of the loaded asphalt mixture with a sheet having a heat retaining effect together with the use of this heat retaining material. According to this, the convective heat transfer from the surface of the asphalt mixture can be further reduced.

Next, the experiment conducted by the present inventor will be described. Using a dump truck with a loading capacity of 4 tons, load 170 ° C asphalt mixture on the platform, and measure the temperature of the asphalt mixture 20 cm away from the side wall and the bottom wall while the dump truck is running. did. The measurement results are shown in Table 1. The unit of the numerical value is ° C.

[0018]

[Table 1]

In Table 1, A indicates the measurement result when the heat insulating material was attached to the side wall. For comparison, the result when the heat insulating material is not attached to the side wall is shown as B. Note that T1 is the temperature immediately after loading, T2 is the temperature 30 minutes after the start of travel, T3 is the same 75 minutes, and T4 is the temperature 135 minutes after the start.

As will be understood from this, when the heat insulating material is provided immediately after loading, the temperature decreases by 5 ° C., whereas when the heat insulating material is not provided, the temperature decreases by 10 ° C. In addition, as the running time elapses, the temperature drops in both cases, but when the heat insulating material was not provided, the temperature decreased from the temperature immediately after loading by 28 ° C, whereas when the heat insulating material was provided, it was only 10 ° C. It only drops. From this, it can be seen that the temperature reduction of the asphalt mixture is suppressed more when the heat insulating material is provided than when the heat insulating material is not provided.

[0021]

[Effect of the device]

 As described above, according to the present invention, when the asphalt mixture is loaded on the bed and transported, the temperature drop due to heat radiation from the wall surface of the bed can be easily reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

[Explanation of symbols]

 1 Dump truck 4 Loading platform 5 Side wall 7 Back wall 7A Front wall 9 Heat insulation material

Claims (1)

[Scope of utility model registration request] 1. A thermal asphalt mixture carrying platform for loading and carrying hot asphalt mixture, wherein a heat insulating material is provided on one or both of an outer surface and an inner surface of a part or all of wall surfaces contacting the loaded asphalt mixture. A bed for transporting hot asphalt mixture made by attaching materials.