JP2989348B2 - How to supply asphalt mixture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying an asphalt mixture used for asphalt pavement.

[0002]

2. Description of the Related Art Conventionally, an asphalt mixture used for asphalt pavement is manufactured through the following steps and supplied to the site.

That is, aggregates such as crushed stone, sand and crushed sand are passed through a drier at a predetermined mixing ratio from a first storage section called a cold bin. While vortexing through the dryer, the aggregate is heated to a predetermined temperature by hot air from the burner,
Then, it is sent to a vibrating sieve by a hot elevator. Here, the aggregate sieved according to particle size and classified according to particle size is temporarily stored in a second storage unit called a hot bottle, and then sent to a measuring tank. On the other hand, a filler such as stone powder stored in a silo or the like is conveyed to a measuring tank by a stone powder elevator, where it is weighed at a predetermined ratio and then charged into a mixer for mixing. Next, a predetermined amount of asphalt, which has been heated to a predetermined temperature by a burner in advance, is injected into the mixer and mixed to obtain a heated asphalt mixture. At this time, since the aggregate is heated by the dryer, the aggregate is mixed well with the asphalt, mixed with the mixer for a predetermined time, taken out to a dump truck or the like, and shipped.

[0004]

As described above, in the production of a heated asphalt mixture, the combustion noise generated from the burner portion in the heating step with a dryer is very loud, and it is difficult to operate at night especially, and When the material is heated and dried, dust adhering to the surface of the aggregate and exhaust gas after burning the burner are scattered into the atmosphere. Furthermore, dust is released into the atmosphere also in the process of the vibrating sieve, the process of the aggregate measuring tank, and the process of stirring and mixing with a mixer, so that pollution problems such as dust, exhaust gas, noise, etc. occur. Above all, dust is a major problem in complaints.

[0005] For this purpose, countermeasures such as mounting a dust collecting device or providing a soundproof wall have been taken.
Not only is a large capital investment forced, but also a large site area is required to install them.

In recent years, land prices have soared, and land acquisition for asphalt plants has required a great deal of cost. At the same time, due to the above-mentioned pollution problems, it is difficult to obtain land for use in urban areas or adjacent to urban areas. Installation of asphalt plants in urban areas is more difficult. Therefore, the asphalt plant is located far away from the urban area, and when supplying the asphalt mixture to urban areas, it takes a long time to transport from the asphalt plant, which causes a decrease in the temperature of the asphalt mixture, and At present, it is becoming difficult to build asphalt pavement of the given quality.

[0007] Therefore, the asphalt mixture produced in the primary plant is transported to a secondary plant adjacent to an urban area or the like, where it is temporarily stored in a silo and shipped, or in consideration of thermal degradation of the asphalt, There is a known means for heating and mixing the asphalt separately into the secondary and secondary parts and supplying the asphalt to the construction site. However, since the asphalt mixture of this means is heated and mixed in the primary plant and the secondary plant, the influence of heat is reduced. As a result, the thermal deterioration of asphalt is inevitable. In addition, one asphalt injection facility
Next, it is not desirable in terms of capital investment, as it is required for both secondary and secondary plants.

Therefore, an object of the present invention is to provide a new asphalt mixture supply method which solves the above-mentioned problems.

[0009]

In order to achieve the above object, the present invention provides an asphalt mixture obtained by adding and mixing foamed asphalt into an aggregate and a filler at room temperature delivered to an asphalt plant. Is temporarily transferred to a relay device installed at a place away from the asphalt plant, and after being carried into the storage unit of the relay device, the asphalt mixture heated to a predetermined temperature by the heating element provided in the storage unit is stored. From the outlet of the department.

[0010]

According to this method, since the asphalt foamed in the aggregate and the filler at room temperature is added and mixed, the generation of dust at the time of mixing can be largely suppressed, and the burning noise of the burner is also eliminated. Also, thermal degradation due to the influence of heat can be reduced. On the other hand, the relay device allows the asphalt mixture to be quickly supplied to the construction site, and the relay device does not require asphalt injection and mixing equipment.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS.

FIG. 1 shows a cold bin 1 of an asphalt plant 3 for storing crushed stone, coarse sand, screenings, fine sand and the like.
A cold feeder 7 for feeding the aggregate to the transport elevator 5 at a required mixing ratio is provided. The transport elevator 5 is provided with a receiving port 5a below and a discharge port 5b above, and feeds the aggregate to the first measuring tank 9 above. The first measuring tank 9 measures the aggregate from the transport elevator 5 by a predetermined amount, and functions to send the aggregate to the mixer 11 arranged at the lower part after the measuring.

The asphalt plant 3 includes, in addition to the cold bin 1 for storing aggregate, a filler storage tank 17 for storing a filler such as stone powder, a water storage tank 19 for storing water, and an asphalt storage tank 21 for storing asphalt. Are provided respectively.

The filler storage tank 17 has a transport section 25 at a lower portion for sending a filler such as stone powder to the transport elevator 23. The transport elevator 23 moves the filler up to the second
To the measuring tank 27 of the
a, a discharge port 23b is provided above. The second measuring tank 27 is for measuring a predetermined amount of the filler sent up by the transport elevator 23, and functions to send the filler to the mixer 11 arranged at the lower portion after the measuring.

The asphalt storage tank 21 has a heating element 29 whose temperature is controlled by a control unit (not shown), and the asphalt melted by the heating element 29 is pumped (not shown) by an asphalt measuring tank. After being weighed by a predetermined amount, it is sent to a foam asphalt manufacturing section. At the same time, the water in the water storage tank 19 is sent to the foamed asphalt production section 31 by an air compressor (not shown).

The foamed asphalt producing section 31 is a foamed state in which water is applied to the dissolved asphalt to expand the asphalt. The asphalt for feeding the foamed asphalt to the mixer 11 has an injection device 33.

The mixer 11 has a shape having a pair of agitating blades 13 for agitating and mixing the aggregate, filler and foamed asphalt, and an openable / closable outlet 15.

On the other hand, a relay device 35 is provided at a place different from the asphalt plant 3.

The relay device 35 temporarily stores the asphalt mixture from the asphalt plant 3 and transports the asphalt mixture from the dump truck 37 upward and the asphalt mixture from the transport elevator 39 to the asphalt mixture. Storage unit 4 for temporary storage
1 is provided. A heating element 45 whose temperature is controlled by the control section 43 is provided in the storage section 41, and a bottom portion of the storage section 41 is an opening 47 that can be opened and closed. Thereby, the noise source and the dust source are eliminated in the relay device 35,
It can be installed in urban and suburban areas.

Next, the operation will be described.

First, in the asphalt plant 3,
In the mixer 11, the measured normal-temperature aggregate and filler,
The foamed asphalt is charged, and the mixture is stirred and mixed for a predetermined time.
As shown in FIG. 2 (b), the asphalt properties at the time of mixing ensure that the asphalt fine particles D are present between the aggregates C, thereby enabling long-term storage. Further, since the aggregate and the filler are mixed with the foamed asphalt at room temperature, the generation of dust during mixing is suppressed to a small extent, and the burning noise of the burner for heating the aggregate is not generated. Moreover, since the aggregate is mixed at room temperature, no thermal degradation of asphalt occurs. Next, the asphalt mixture that has been stirred and mixed is loaded into the dump truck 37 from the outlet 15.

The asphalt mixture loaded on the dump truck 37 is once carried to the relay device 35, where it is carried into the storage section 41 by the transport elevator 39, where it is temporarily stored. During this storage, the asphalt mixture enters a standby state in which the heating element 45 secures a shipping state in which the surface of the aggregate D is covered with the asphalt E as shown in FIG.

Next, the asphalt mixture is loaded onto the dump truck 37 from the outlet 47 of the storage unit 41 and shipped.
In this case, a weighing section may be provided below the outlet 47,
If a mixer is installed, the asphalt coding efficiency (FIG. 2A) can be improved.

As a result, the relay device 35 can quickly transport the asphalt mixture to the site without causing a decrease in the temperature of the asphalt mixture.

The asphalt mixture at the time of shipment is shown in FIG.
As shown in Table 2, it was confirmed that there was no problem in quality as compared with those manufactured by the conventional manufacturing method. In addition, as aggregate, asphalt pavement waste material, concrete waste material, industrial waste such as slag may be used or added,
Furthermore, it is also possible to add a modifier such as resin or rubber to impart fluid resistance and abrasion resistance.

[0026]

As described above, according to the present invention, in the asphalt plant, the scattering of dust such as dust during the transportation and mixing of the aggregate can be suppressed. At the same time, there is an advantage that investment in equipment such as a burner device and a dust collecting device is not required. Moreover, the site area of the asphalt plant can be reduced. Further, since direct heating by a burner or the like is not performed, generation of combustion noise, exhaust gas, etc. does not occur, and the pollution problem is solved. On the other hand, also in the relay device, the site area can be reduced, and since it is based on the indirect heating method using a heating element, there is no generation of combustion noise, exhaust gas, etc., and no pollution problem. Furthermore, by performing such a manufacturing process, it is possible to install the plant in a place where a conventional plant is difficult to install, such as an urban area or an urban area, and to supply a good quality asphalt mixture to surrounding construction sites. can do.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an asphalt plant and a relay device of the present invention.

FIG. 2 is an explanatory diagram showing properties of an asphalt mixture.

FIG. 3 is a view showing a marshall test result of an asphalt mixture.

[Explanation of symbols]

 3 asphalt plant 35 relay device 41 storage unit 45 heating element 47 outlet

Claims (1)

(57) [Claims] Claims 1. An asphalt foamed in an aggregate and a filler at normal temperature delivered to an asphalt plant is added and mixed, and the asphalt mixture is once transferred to a relay device installed at a place away from the asphalt plant,
A method for supplying an asphalt mixture, wherein the asphalt mixture heated to a predetermined temperature by a heating element provided in the storage unit is taken out from an outlet of the storage unit and shipped after being carried into the storage unit of the relay device.