JP2002188111A - Manufacturing device of special asphalt mixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase efficiency of delivery and work by delivering a special asphalt mixture so far regarded as underiverable from a silo, from the silo. SOLUTION: In a device for manufacturing the special asphalt mixture using an asphalt binder, an aggregate, and at least one kind of adding material as an essential component, this manufacturing device of the special asphalt mixture has the heating storage silo for the asphalt mixture, a weighing device for the asphalt mixture discharged from the silo arranged in the lower part vicinity of a discharge gate of the silo, an adding material weighing device, and a mixer arranged under these weighting devices.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a special asphalt mixture, and more particularly to the production of a special asphalt mixture capable of efficiently modifying an asphalt binder and imparting functionality to a pavement. Related to the device.

[0002]

2. Description of the Related Art Asphalt mixtures (hereinafter sometimes referred to as "mixtures") used for pavement of roads and the like are produced by mixing and mixing aggregates such as crushed stones, gravel, sand and stone powder with an asphalt binder. In order to improve shipping efficiency, a heating storage silo (hereinafter sometimes abbreviated as a mixture silo or simply a silo) will be installed in a mixture production plant or in a suburb of a city away from the mixture production plant, and the storage / silo will be used for storage / Shipping is increasing. However, storage and shipping using this silo has been practically limited to a general-purpose asphalt mixture that has been stably present in the silo for a relatively long time and has no difficulty discharging from the silo.

[0003]

DISCLOSURE OF THE INVENTION The present inventors have studied the applicability of storage and shipping of various mixes in silos, and have found that the following mixes are not suitable for silo storage.

[0004] (1) What is caused by the binder 1) Deterioration of the added material As a problem on the binder, first, materials (modifiers, additives) added to impart new performance to the asphalt binder are added. May be altered during storage in silos. In such a case, due to the deterioration of the additive material, the function that the composite material should originally have cannot be exhibited. This includes, for example, the following. Additives with a short effect (additives: foaming intermediate warming agent / mixture: medium-temperature composites, etc.), and thermosetting ones that undergo a chemical reaction during storage (additives: epoxy resin / mixture: epoxy asphalt Mixture, etc.), those that are susceptible to thermal degradation during storage (additive material: rubber powder / mixture: rubber-containing mixture, etc.) 2) Adhesion of asphalt mortar If a binder with high viscosity is used, mix, especially mortar Minutes adhere to the inner wall of the silo, and the adhesion may grow and block near the discharge port. In such a state, it becomes impossible to ship the mixture itself, so that it cannot be stored in the silo. Examples of the mixture corresponding thereto include a mixture using modified asphalt (type I or type II), semi-blown asphalt, or the like as a binder.
In addition, a mixture obtained by mixing a fibrous reinforcing material and the like also has an increased apparent viscosity and easily adheres to the inner wall of the silo.

(2) Problems caused by aggregate particle size A problem with aggregate particle size is that the mixture is clogged near the discharge port due to the engagement of the aggregate. For example, a mixture having a gap particle size (a dense particle gap asphalt mixture, a fine particle gap asphalt mixture), an open particle mixture (an open particle asphalt mixture, a drainage pavement asphalt mixture, and a water-permeable pavement asphalt mixture), a large particle size Such materials are applicable to this. In addition, as for the asphalt mixture for drainage pavement, since high-viscosity asphalt is used as a binder, this is also a reason why it cannot be stored in a silo (see (1) 2) above).

(3) Others When a color mixture containing a pigment or the like is stored in a silo,
The colored binder or mortar adheres to the inner wall of the silo, and then gives the mixture to the silo its color.
Some of the pigments and binders used in the color mixture are discolored by heat during storage. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an apparatus for efficiently producing a mixture that is not suitable for silo storage as described above (these are collectively referred to as a special asphalt mixture or special mixture).

[0007]

SUMMARY OF THE INVENTION The present invention firstly provides an apparatus for producing a special asphalt mixture containing an asphalt binder, an aggregate and at least one additional material as essential components. , A measuring device for asphalt mixture discharged from the silo disposed near the lower part of the discharge gate of the silo, a measuring device for added material, and a mixer disposed below the measuring device, producing a special asphalt mixture. Device. Secondly, the present invention is the above-mentioned device further comprising a measuring device and a spraying device for a binder to be separately added to an upper portion of the mixer. Thirdly, the present invention relates to an apparatus for producing a special asphalt mixture containing an asphalt-based binder, an aggregate and at least one additional material as essential components, wherein a heated storage silo for the asphalt mixture is provided near a lower portion of a discharge gate of the silo. An apparatus for producing a special asphalt mixture, comprising: a mixer having a function of measuring an asphalt mixture discharged from the silo disposed therein; and an additive material measuring device disposed above the mixer.
Fourthly, the present invention is the above-mentioned device further comprising a measuring device and a spraying device for a binder to be separately added to an upper portion of the mixer. Fifth, the present invention relates to an apparatus for producing a special asphalt mixture containing an asphalt-based binder, an aggregate and at least one additive material as essential components, wherein a heated storage silo for the asphalt mixture is provided near a discharge gate lower portion of the silo. A mixer provided with a function of measuring a plurality of arranged materials, and an additive material supply device disposed above the mixer, and the mixer performs cumulative measurement and mixing of the asphalt mixture discharged from the silo and the additive material. An apparatus for producing a special asphalt mixture, characterized in that: The present invention
Sixth, there is also provided a binder supply device for separately adding to the upper part of the mixer, wherein the asphalt mixture discharged from the silo, the additive material, and the cumulative weighing and mixing of the binder separately added are performed by the mixer. Device.

FIGS. 1 to 4 are explanatory views of the apparatus of the present invention. In FIG. 1 and FIG. 2, a mixture produced by an asphalt plant or a mixture transported from a distant factory by truck is stored in two silos by one skip elevator. The required amount of the mixed material in the silo is measured by a mixed material measuring hopper of 3, and the various additive materials are measured by an additive material hopper of 4, and each is put into a mixer of 5 and mixed to produce a mixed material. . When the amount of the binder in the silo is made smaller than the final required amount, the binder measured by the binder measuring tank of No. 7 is sprayed to the mixer of No. 5 by the spray pump 8 and mixed to produce a special mixture.
The special mixture thus produced is transported to the pavement site by six trucks.

FIG. 3 shows a flow chart of the above-mentioned process, in which the material weighing hopper 3 is omitted, a measuring device such as a load cell 10 is attached to a mixer 5 and the mixture is weighed by a mixer. In this embodiment, a special mixture is manufactured by weighing the additive material and, if necessary, a binder, charging the mixture into a mixer, and mixing the mixture with the mixture. FIG. 4 shows an embodiment in which a mixture, an additive, and a binder are cumulatively weighed by the five mixers equipped with the weighing device to produce a desired special mixture. In this case, a predetermined amount of the mixture is discharged from the 9 material silo measuring gate to the mixer, the additional material is supplied to the mixer by a predetermined amount by 12 surge bins, 13 measurement valves, 14 chutes, etc., the binder is 15 tanks, 16 A predetermined amount is supplied to each mixer by the supply pump and the spraying device of 11 to produce a desired special mixture.

As an example of the additional material to be separately added to the asphalt mixture discharged from the outlet of the silo in the use of the apparatus of the present invention, an asphalt modifier (a) for modifying an asphalt binder such as petroleum asphalt for paving
As a modification I to give asphalt abrasion resistance etc.
Mold additive, for example, styrene-butadiene rubber (SB
R) (liquid (emulsion)) or solid (powder, granular, granular) using SBR and thermoplastic elastomer in combination, modified type II additive that imparts fluid resistance to asphalt,
For example, styrene-butadiene block polymer (SB
S), styrene-isoprene block polymer (SI
S), thermoplastic elastomer solids (powder, granular, granular) such as ethylene / vinyl acetate copolymer (EVA) and ethylene / ethyl acrylate copolymer (EEA), penetration adjusters such as Gilsonite There are solids (powder) and the like. Examples of the function-imparting material (b) for imparting functionality to the pavement include pigments such as iron oxide (bengara), chromium oxide, and titanium oxide (all in solid (powder)), vegetable fibers, and synthetic fibers Fibrous reinforcing materials such as fibers and mineral fibers (all solid (short fibrous)), elasticity imparting materials such as rubber chips (solid (powder, particulate)), foamable inorganic substances (solid (paste)), etc. And a freezing delay material such as a salt-containing artificial aggregate (solid (particulate)), an oil absorbing material such as a porous artificial aggregate (solid (particulate)), and the like.

In using the apparatus of the present invention, a poorly mixed mixture in which the amount of binder of the mixture to be heated and stored in the silo is smaller than the final required amount is stored in the silo, and the mixture is discharged from the silo. It is also preferable to add and mix a modified asphalt, a colored asphalt or the like as a shortage of binder at this point. In this case, as a binder to be separately added, there is a binder which is difficult to store in a silo due to high viscosity or easily deteriorates due to heat or deteriorates. Specific examples thereof include modified asphalt type I (premix type, Thermoplastic), modified asphalt type II (premix type, thermoplastic), high viscosity modified asphalt (used for drainage pavement, premix type, thermoplastic), semi-blown asphalt (premix type, thermoplastic) And thermosetting asphalt (adding an epoxy resin or the like, premix type, thermosetting) and the like. In addition, colored asphalt (premix type, thermoplastic) is one that is difficult to store in a silo because the wall surface is colored.

According to the present invention, various kinds of composite materials that cannot be shipped in silos can now be shipped in silos.
The shipping capacity of the composite material factory is increased, and the desired pavement can be efficiently constructed. In addition, it will be possible to install only silo-related equipment in the suburbs of urban areas where there is a great demand for special mixes away from the mix factory, and special mixes can be shipped.
The distance of transporting the mixture from the construction site is shortened, and the work efficiency of pavement construction using special mixture is increased. In addition, if the work efficiency of the pavement construction using the special mixture increases, the pavement can be continuously performed, so that the workability and quality of the pavement can be improved.

[0013]

Embodiment 1 (Tough Plus S-101): An embodiment of the present invention will be described with reference to FIG. After the mixture produced in the asphalt plant is discharged from a mixer (not shown), the mixture is transported above the mixture silo 2 by the skip elevator 1 shown in FIG. It is put into the material silo 2. An electric heater is embedded in the inner wall of the mixture silo 2, and the charged mixture can be stored while being kept at a constant temperature (for example, about 150 ° C.). In this embodiment, the mixture stored in the mixture silo 2 is a general asphalt mixture, such as a coarse particle asphalt mixture, a dense particle asphalt mixture, a fine particle asphalt mixture, or the like. Table 1 shows an example of the mixture ratio of these composite materials.

[0014]

[Table 1]

The procedure for shipping a special mixture according to the present embodiment is as follows. By opening the mixture discharge port at the bottom of the mixture silo 2, the mixture stored in the mixture silo 2 is placed under the mixture silo 2 to measure the mixture hopper 3.
To After weighing a predetermined amount of the mixture, the mixture discharge port at the lower portion of the mixture hopper 3 is opened, and the mixture is put into the mixer 5 installed below the mixture hopper 3. On the other hand, the additive material (Tough Plus S-101) is a mixture of a thermoplastic elastomer powder and a mineral powder at an equal weight ratio, and is a plant mix type modifier. This additive material is packed in a bag made of polyethylene, and a predetermined amount of the bag together with the bag is directly mixed with the mixture.
The mixing time at this time is 25 to 30 seconds. After mixing is complete,
Open the material discharge port at the bottom of the mixer, load the required amount into a dump truck and ship it to the site. The properties of the special mix A shipped by the method of the present invention, the special mix B shipped by the conventional method (shipped directly from the asphalt plant), and the general mix C shipped by the conventional method Table 2 shows the comparison test results. As can be seen from the test results, there is almost no difference between the properties of the special mixture A and the special mixture B, and both the special mixtures A and B are superior in properties to the general mixture C. It can be said.
Therefore, according to the method of the present invention, it is possible to ship, from the silo, a special mixture having the same quality as the special mixture shipped by the conventional method.

[0016]

[Table 2]

Example 2 (color pavement): A mixture produced in an asphalt plant is stored in a mixture silo 2 in the same manner as in Example 1. At this time, the mixture stored in the mixture silo 2 is a general asphalt mixture, such as a fine-grained asphalt mixture. The mixing ratio of the mixture is as shown in Table 1. The procedure for shipping the special mixture according to this embodiment is as follows.
It is as follows. By opening the mixture discharge port at the bottom of the mixture silo 2, the mixture stored in the mixture silo 2 is supplied to the mixture weighing hopper 3 installed below the mixture silo 2. After measuring a predetermined amount of the mixture, the mixture hopper 3
Open the mixture discharge port at the bottom of the
Into the mixer 5 installed below the. On the other hand, the additive material (Bengara = iron oxide) stored in the additive material hopper 4
Is weighed and a predetermined amount (5.8% by weight based on the mixture) is charged into the mixer 5 and mixed with the mixture. After the mixing is completed, the mixture discharge port at the bottom of the mixer 5 is opened, and the required amount is loaded on the dump truck and shipped to the site. When the color mixture shipped by the method of the present invention was compared with the color mixture shipped by the conventional method, no significant difference was found in hue, color, and brightness of the color. Therefore, according to the method of the present invention, it is possible to ship a color mixture of the same quality as a color mixture shipped by a conventional method from a silo.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of the apparatus of the present invention.

FIG. 2 is an explanatory view showing an example of the device of the present invention.

FIG. 3 is an explanatory view showing an example of the apparatus of the present invention.

FIG. 4 is an explanatory view showing an example of the apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Skip elevator 2 Mix material silo 3 Mix material measuring hopper 4 Additive material hopper 5 Mixer 6 Truck 7 Binder measuring tank 8 Spray pump 9 Mix material silo measuring gate 10 Load cell 11 Sprayer 12 Surge bin 13 Metering valve 14 Chute 15 Tank 16 Supply pump

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshitomo Mizuno 1-19-11 Kyobashi, Chuo-ku, Tokyo Inside Nihonbudo Co., Ltd. (72) Tomohiro Gomachi 1-19-11 Kyobashi, Chuo-ku, Tokyo No. F-term in Nihon Hodou Co., Ltd. (reference) 2D052 AA03 BA06 BA11 BA23 DA09 DA12

Claims (6)

[Claims] 1. An apparatus for producing a special asphalt mixture containing an asphalt-based binder, an aggregate and at least one additional material as essential components, comprising: a heating storage silo for the asphalt mixture; and a silo disposed near a lower portion of a discharge gate of the silo. A device for producing a special asphalt mixture, comprising: a device for measuring an asphalt mixture discharged from a silo, a device for measuring an additive material, and a mixer disposed below the measuring device. 2. The apparatus according to claim 1, further comprising a metering device and a spraying device for a binder to be separately added to an upper portion of the mixer. 3. An apparatus for producing a special asphalt mixture containing an asphalt-based binder, an aggregate and at least one additional material as essential components, wherein the storage silo is a heated storage silo for the asphalt mixture, and the silo is disposed near a lower portion of a discharge gate of the silo. An apparatus for producing a special asphalt mixture, comprising: a mixer having a function of measuring an asphalt mixture discharged from a silo; and an additive material measuring device disposed above the mixer. 4. The apparatus according to claim 3, further comprising a metering device and a spraying device for a binder to be separately added to an upper portion of the mixer. 5. An apparatus for producing a special asphalt mixture containing an asphalt-based binder, an aggregate and at least one additional material as essential components, comprising a heated storage silo for the asphalt mixture, and a plurality of silos disposed near a lower portion of a discharge gate of the silo. A mixer having a material weighing function, and an additive material supply device disposed above the mixer, wherein the mixer performs cumulative weighing and mixing of the asphalt mixture discharged from the silo and the additive material. Production equipment for special asphalt mixtures. 6. A mixer supply device is provided above the mixer for separately adding, and the mixer is configured to perform cumulative weighing and mixing of the asphalt mixture discharged from the silo, the added material, and the separately added binder. Item 6. The apparatus according to Item 5.