JP2000045215A - Spray type surface treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly connect an aggregate onto a road surface without using an excessive bituminous material and construct a firm spray type surface treatment layer by forming a bituminous material layer of foaming state on the road surface, and scattering the aggregate thereon. SOLUTION: A layer of bituminous material 2 of foaming state is formed on a road surface 1, and an aggregate 3 is scattered thereon. The bituminous material 2 is preferably foamed so that the volume is increased about 1.1-20 times the original volume. The bituminous material 2 laid in the foaming state forms a relatively thick bituminous material 2 layer on the road surface 1 even in a small quantity, and when the aggregate 3 is scattered thereon, the aggregate surface having a large area is covered with the bituminous material 2. Accordingly, even in the state where the foaming of the bituminous material 2 is settled, the contact area of the aggregate 3 with the bituminous material 2 is large, the binding force between the road surface 1 and the aggregate 3 and between the aggregates 3 is remarkably increased to eliminate the possibility of excessively scattering the aggregate 3. Since the bituminous material 2 is not excessively used, the flash phenomenon of the bituminous material 2 never occurs in summer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spraying surface treatment method, and more particularly, to an improved spraying surface treatment method for spraying aggregate on a bitumen material in a foamed state.

[0002]

2. Description of the Related Art As road pavement becomes available for traffic,
The aging and deterioration gradually progress, and the road surface may be worn to form irregularities, and the pavement surface may have cracks or the like. If the irregularities and cracks are left, the safety of the passing vehicle may be threatened, and rainwater or the like may permeate through the cracks into the inside of the pavement and cause damage or destruction of the pavement itself.

Conventionally, as a method of repairing such aged and deteriorated road pavement, a spray surface treatment method, a mixed surface treatment method, and an overlay method have been proposed. Among them, the spraying type surface treatment method is, for example, as shown in FIG. 1, a bituminous material 2 such as asphalt is sprayed in a film form on the road surface 1 on which aging or deterioration has caused unevenness or cracks. Sprinkle aggregate 3 on top
In this method, the aggregate 3 is connected to the road surface 1 by using a method, and a layer composed of the bituminous material 2 and the aggregate 3 is constructed on the road surface 1.

[0004] This spraying type surface treatment method is relatively effective as a method for repairing aged and deteriorated pavement because the surface of the pavement can be repaired relatively easily. However, the repair method using an asphalt mixture is not effective. On the contrary, since the aggregate is simply connected to the road surface by bituminous material, the scratching force and impact force received from the tires etc. of passing vehicles,
In some cases, a phenomenon in which the aggregate scattered on the bituminous material is scattered as shown in FIG. If the aggregate 4 is scattered, the bituminous material directly appears on the road surface, so that the road surface flashes and becomes extremely slippery, causing a slip of a passing vehicle or the like, which may cause a traffic accident. There was sex.

As an attempt to prevent such aggregates from scattering, it is conceivable to increase the amount of bituminous material to be sprayed to increase the thickness of the bituminous material and to firmly anchor the aggregates.
When the amount of bituminous material increases, a flash phenomenon caused by excessive bituminous material occurs when the road surface temperature rises in summer or the like when the sun is strong, which may result in a traffic obstacle.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned drawbacks of the prior art. The present invention has been made to firmly lay aggregate on a road without using excessive bituminous material. An object of the present invention is to provide a spray-type surface treatment method that can be combined.

[0007]

Means for Solving the Problems The present inventors have repeatedly studied the mechanism by which the aggregate is bonded on the road surface by the bituminous material in the spraying type surface treatment method, and as a result, the bitumen in a state of being firstly foamed on the road surface. By forming a layer of material and spraying the aggregate on it, the bonding strength of the aggregate to the road surface by the bituminous material is significantly enhanced, and a strong dusting surface treatment without using excess bituminous material The inventors have found that the layers can be constructed and completed the present invention.

That is, the present invention provides a spray-type surface treatment method comprising a step of forming a layer of a bitumen material in a foamed state on a road surface, and a step of spraying an aggregate on the layer of a bituminous material in a foamed state. The above-mentioned subject is solved by providing.

In forming the layer of the bituminous material in a foamed state on the road surface, the bituminous material and the foaming material are sprayed simultaneously or in succession, so that the bituminous material and the foaming material are sprayed on the road surface and / or.
Alternatively, the bituminous material may be foamed by contacting and mixing in the air, or the bitumen material may be sprayed in advance by contacting and mixing the bituminous material and the foaming material.

It is preferable to use water as the foaming material, and a predetermined amount of various foaming accelerators can be mixed with the water as required.

According to the knowledge of the present inventors, the bitumen material in a state of being expanded by foaming has a relatively thick bituminous material 2 on the road surface 1 even in a small amount, for example, as shown in FIG. When the aggregate 3 is sprayed thereon, the surface of the aggregate having a much larger area is covered with the bituminous material 2 than when the bituminous material 2 is not foamed. As a result, for example, as shown in FIG. 3, even when the foaming of the bituminous material 2 is stopped, the contact area between the aggregate 3 and the bituminous material 2 is large, and between the road surface 1 and the aggregate 3 and between the aggregate 3 and the aggregate. The coupling force between the members 3 is remarkably increased, and there is no possibility that the aggregates 3 are scattered in darkness by passing a vehicle or the like. Further, since the bituminous material 2 is not excessively used, the bituminous material 2 is not melted even in the summer season when the road surface temperature rises, and the flash phenomenon does not occur.

Although the degree of foaming of the bituminous material in the present invention is not particularly limited, it is usually 1.1 times the original volume of the bituminous material.
It is preferable to foam the foam so that the volume increases up to about 20 times. If the volume increase is less than 1.1 times, the effect of foaming cannot be sufficiently expected. Conversely, even if the volume is foamed to more than 20 times, no significant difference in the effect is observed. Normally,
It is preferable to foam the foam to about 3 to 15 times the volume before foaming.

In the spraying type surface treatment method of the present invention, since it is necessary to spray aggregate while the bituminous material is foaming, a foamed bituminous material layer is formed on the road surface. It is preferable that the time until the application of the aggregate is short, and it is more preferable that the time is short and constant. In order to facilitate such construction, at least the application of the bituminous material and the foam material is required. It is desirable that the apparatus or the apparatus for spreading foamed bitumen material and the apparatus for spreading aggregate are mounted on a single work vehicle and work is performed using this work vehicle. As such a working vehicle, for example, Japanese Patent Application No. 10-1 by the same applicant is disclosed.
No. 58664, Japanese Patent Application No. 10-158665, Japanese Patent Application No. 10-172107, Japanese Patent Application No.
No. 172119 and Japanese Patent Application No. 10-17798
It is preferable to use a work vehicle as disclosed in the specification of Japanese Patent Application Laid-Open No. 6-64.

The spray type surface treatment method of the present invention is not limited to general roads, but can also be used for paving automobile exclusive roads, campus roads, park roads, walking paths, bicycle paths, sports fields, parking lots, airfields, port facilities and the like. It can be used not only for repair, but also for construction of a surface layer in new construction.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a spray type surface treatment method of the present invention will be described in detail.

First, the materials used will be described.

<Bitumen Material> As the bitumen material used in the spray surface treatment method of the present invention, natural asphalt such as lake asphalt, straight asphalt, blown asphalt, semi-blown asphalt, solvent deasphalted asphalt (for example, propane deasphalted) Bituminous materials such as petroleum asphalt such as asphalt), heavy oil, tar and pitch.

To these bituminous materials, natural rubber or various synthetic rubbers can be added alone or in combination. As synthetic rubber, chloroprene rubber, styrene
Various synthetic rubbers such as isoprene copolymer rubber, styrene / butadiene / styrene copolymer rubber, polyisoprene rubber, polybutadiene rubber, and styrene / butadiene copolymer rubber are used alone or in combination. In particular, when chloroprene rubber or styrene-isoprene copolymer rubber is used, characteristics at high and low temperatures are improved, which is preferable. Further, a Mooney viscosity of a solid or latex type, preferably about 10 to 100, is preferable since good results are obtained.

The bituminous material used in the present invention includes:
In addition to rubber, synthetic polymer polymers such as ethylene vinyl acetate copolymer, polyethyl acrylate, polymethyl acrylate, polyacrylic acid, and polyvinyl chloride, coumarone resin, carbonate resin, xylene resin, urea formalin resin, and alkyd resin And natural resins such as rosin and terpene resin.

To these bituminous materials, ultraviolet absorbers, various additives, viscosity modifiers, etc. are added for the purpose of improving heat resistance, preventing deterioration due to ultraviolet rays, improving workability, and improving adhesiveness. You may.

<Foaming Material> On the other hand, the foaming material used in the present invention is usually water such as distilled water, drinking water, industrial water, lake water, river water, and the like. % Of a foaming accelerator is used. Even if the foaming accelerator is added in an amount exceeding 20% by weight, no significant difference is observed in the effect, which is economically inconvenient.

As the foaming accelerator to be used, sodium bicarbonate and various emulsifiers can be used. As the emulsifier, any of a cationic type, an anionic type and an amphoteric type can be used. In addition, hydrogen peroxide and salad powder, hydrochloric acid and baking soda, magnesium and lead and alkali, calcium carbide and the like can be used, and further, resin soap,
Synthetic surfactants such as alkyl sulfonic acids, protein derivatives such as casein and gelatin, and high molecular surfactants such as maleic acid can be used. These foaming accelerators are used alone or in combination of two or more.

<Aggregate> The aggregate used in the present invention is an aggregate for pavement described in "Asphalt Pavement Outlines" issued by the Japan Road Association, such as crushed stone, crushed stone, gravel, steel slag, etc. It is. Further, asphalt-coated aggregates obtained by coating these aggregates with asphalt, recycled aggregates, and the like can also be used. Other granular materials similar thereto include artificially fired aggregates, fired foamed aggregates, artificial lightweight aggregates, ceramic particles, luxovite, Sinopearl, aluminum particles, plastic particles, ceramics, emery and the like.

The particle size of the aggregate used in the present invention is not particularly limited, and any particle size from fine aggregate to coarse aggregate can be used, but the thickness of the surface treatment layer to be constructed is uniform. As such, the aggregate used for one application is preferably of a single particle size. In addition, it is preferable that the surface of the aggregate is removed by washing with water or the like prior to use, because the adhesion of the bituminous material increases. Also, for the aggregate used, 0.3 for the aggregate
About 1% by weight of asphalt emulsion, straight asphalt, or modified asphalt may be coated. If colored aggregate is used, color pavement can be easily realized.

Next, the spray type surface treatment method of the present invention will be described.

<Formation of foamed bituminous material layer> In the present invention, the foamed bituminous material layer may be formed on a road surface by any method.
The bituminous material and the foaming material are sprayed simultaneously or one after the other, and the bituminous material and the foaming material are contacted and mixed on the road surface and / or in the air to foam the bituminous material, and the layer of the bitumen material in the foamed state is formed. It is possible to form a layer of bitumen material in a foamed state on a road surface by contacting, mixing and pre-foaming bituminous material and foam material on a road surface and spraying the foamed bituminous material. Is preferred.

First, the bitumen material and the foaming material are sprayed simultaneously or before and after, and the bituminous material and the foaming material are contacted and mixed on the road surface and / or in the air to foam the bituminous material. Using different kinds of nozzles, bituminous material and foam material,
They are sprayed so that they contact and mix with each other in the air or on the road. If you mainly want to contact and mix the two in the air, just arrange the nozzle so that the spray area of both overlaps in the air.If you mainly contact and mix on the road surface, both will be in the same place on the road surface The nozzles may be arranged so as to be sprayed simultaneously or before and after.
When spraying one after another, the bitumen material and the foaming material may be sprayed in any order of the bituminous material and the foaming material. Spraying is preferably performed by a work vehicle equipped with a spray bar for bituminous material and a foam material, and a plurality of nozzles attached to the spray bar at positions close to each other, and the spray width is determined according to the construction width. It is preferable that it is configured to be freely changeable. Further, as the nozzle, a spray nozzle of a multi-headed gun capable of simultaneously spraying a plurality of materials may be used. Before the bituminous material and the foaming agent are sprayed, the construction road surface is preferably heated by a heating device such as a heater planar.

The amount of bitumen material to be sprayed is 0.4 to 2.5 (l
/ M ² ), preferably 0.8 to 2.0 (l /
m ² ). Spraying amount of bituminous material is 0.4 (l / m
^If it is less than ² ), the aggregate cannot be bonded well. On the other hand, if it exceeds 2.5 (l / m ² ), it may cause a flash phenomenon. The bituminous material is preferably used by heating, and the heating temperature is selected to be a temperature at which an appropriate viscosity is obtained based on a temperature-viscosity curve of each bituminous material.
Usually 90 to 210 ° C, preferably 150 to 180 ° C
It is used after being heated to a certain degree.

When contacting and mixing on the road surface and / or in the air, the amount of the foaming material with respect to the bituminous material is 100%.
The foaming material is preferably 0.1 to 40 parts by volume with respect to the volume. If the amount of the foaming material is less than 0.1 part by volume, the bituminous material cannot be sufficiently foamed. Conversely, if the amount of the foaming material exceeds 40 parts by volume, the foaming is not easily accommodated, and it takes time to develop the strength. It is too inconvenient. The foamed material may be sprayed at room temperature, but it is usually preferable to heat the foamed material to about 70 to 90 ° C. for spraying.

The bituminous material and the foaming agent are sprayed, and when they come into contact with each other and mix, they foam to form a layer of the foamed bituminous material on the road surface. The spray height of the bituminous material and the foaming agent, that is, the position of the nozzle is preferably in the range of 5 to 50 cm from the road surface,
More preferably, it is in the range of 7 to 35 cm.

Next, in order to make the bituminous material and the foaming material come into contact with each other in advance, mix and foam the foamed bituminous material, the bituminous material and the foaming material are first introduced into a foaming apparatus. The two are contacted and mixed to foam the bituminous material. The foaming device to be used is not particularly limited, and any foaming device may be used as long as it can contact and mix the bituminous material and the foaming material to foam.
Conventionally known foaming apparatuses such as a line mixer type foaming machine, a stirring type foaming machine, and a pressure type foaming nozzle can be used.
A gas such as air may be forcibly blown into these foaming devices in addition to the bituminous material and the foaming material.

The foamed bituminous material is sprayed through a nozzle (as it is when a pressurized foaming nozzle is used) toward a road surface. When using a foaming device such as a line mixer type foaming machine or a stirring type foaming machine, the spraying is preferably performed by a work vehicle equipped with the foaming device and a spray bar and a plurality of nozzles attached to the spray bar. When a pressurized foaming nozzle is used, it is preferable to use a work vehicle equipped with a spray bar to which a plurality of pressurized foaming nozzles are attached. In any case, it is preferable that the spray width is configured to be freely changeable according to the construction width. Prior to spraying the foamed bituminous material, it is preferable to heat the construction road surface with a heating device such as a heater planar.

Preferably, the bituminous material is heated and introduced into the foaming apparatus, and the heating temperature is the same as when the bituminous material and the foaming material are contacted and mixed in the air and / or on the road surface.
Basically, the temperature is selected to be an appropriate viscosity based on the temperature-viscosity curve of each bituminous material, but the bituminous material is usually heated to about 90 to 210 ° C, preferably about 150 to 180 ° C. In the state, it is introduced into a foaming device.

On the other hand, the foamed material may be introduced into the foaming apparatus at room temperature, but it is usually preferable to heat the foamed material to about 70 to 90 ° C. and introduce it into the foaming apparatus. The amount of the foaming material introduced into the foaming device is 0.05 to 10 parts by volume, preferably 0.1 to 5 parts by volume, per 100 parts by volume of the bituminous material. If the amount of the foaming material is less than 0.05 part by volume, the bituminous material cannot be sufficiently foamed. Conversely, if the amount of the foaming material exceeds 10 parts by volume, there is not much difference in the effect and the economy is low. Is not preferred.

The spraying amount of the foamed bituminous material is determined by the volume before foaming.
In product conversion, 0.4-2.5 (l / m ² ) And preferred
Or 0.8-2.0 (l / m² ). Bituminous material
Spraying amount of 0.4 (l / m² Less than) good aggregate
To 2.5 (l / m² )
Exceeding this may cause a flash phenomenon. Foaming
The height of the sprayed bitumen material, that is, the position of the nozzle,
Is preferably in the range of 5 to 50 cm, more preferably 7 to 50 cm.
It is in the range of ３５35 cm.

<Spraying of Aggregate> The foamed bituminous material layer is formed on the road surface as described above, and then the aggregate is sprayed thereon. The application of the aggregate must be performed while the foaming state of the bituminous material is continuing. For this purpose, a device for spreading the bituminous material or the foam and a device for dispersing the aggregate, or a method for applying the foamed bituminous material are used. It is efficient and desirable to mount the dispersing device and the aggregate dispersing device on a single work vehicle and proceed with the work while moving the work vehicle. Spraying devices for bituminous materials or foamed bituminous materials and foams and aggregates should be installed so that the tires and crawlers of the working vehicle are not located between the spraying positions, in other words, the bituminous materials or foaming materials. After the bituminous material or foam is sprayed and before the aggregate is sprayed, the tires and crawlers of the working vehicle are not sprayed through the spraying area, for example, each spraying of bituminous material, foam and aggregate. Both positions are arranged so as to be in front of the front wheels of the work vehicle, between the front wheels and the rear wheels, or behind the rear wheels. Such a working vehicle is disclosed in Japanese Patent Application No. 10-158664 and Japanese Patent Application No. 10-1 by the same applicant.
The working vehicle disclosed in Japanese Patent Application No. 58665, Japanese Patent Application No. 10-172107, Japanese Patent Application No. 10-172119, and Japanese Patent Application No. 10-177886 is exemplified. It is desirable to use such a working vehicle in order to apply the spray type surface treatment method. In addition,
When spraying the foamed bituminous material, it is desirable that the foaming device for the bituminous material is also mounted on the work vehicle as described above.

The amount of aggregate to be applied is 100 per application.
m ² per ranges from 0.2～2.5M ^3, preferably 0.4~2.0m ^3. Aggregate spray rate is 1
If it is less than 0.2 m ³ per 00 m ² , it may cause a flash phenomenon. Conversely, if it exceeds 2.5 m ³ , excess aggregate may be scattered as the vehicle passes. .

The aggregate to be sprayed is preferably of a single grain size.
In one application, the application is carried out such that a substantially single-layered aggregate layer is formed on the road surface. Aggregates are usually 100-170
It is sprayed in a state of being heated to ° C., but may be sprayed at normal temperature.

After the aggregates are sprayed, it is desirable to compact the road surface. As the compacting machine, for example, a self-propelled compacting machine such as a tire roller, an iron wheel roller, and a vibrating roller can be used.

Hereinafter, the present invention will be further described with reference to Examples, but it goes without saying that the present invention is not limited to these Examples.

[0041]

Example 1 A spray-type surface treatment method of the present invention was applied over a range of 1 m in width and 2 m in length using an on-site road. First, set the work area to about 60 using a heater planar.
After heating to ° C., the foam was first sprayed onto the road using a laboratory sprayer, and immediately the bituminous material was also sprayed onto the road using the same experimental sprayer. The foam material and the bituminous material were mixed on the road surface and active foaming was observed. After spraying the aggregate, the work was completed by sufficiently rolling the scattered surface of the aggregate with a vibrating roller.

The materials used are as follows. <Bitumen material> Bituminous material: Gumphalt S (manufactured by Nichireki Co., Ltd.) (heated asphalt) Spraying amount: 1.0 (l / m ² ) Spraying temperature: 170 ° C

<Foaming Material> Foaming material: 10% by weight aqueous solution of alicyclic surfactant Spraying amount: 0.4 (l / m ² ) Spraying temperature: 82 ° C.

[0044] <aggregate> Aggregate: No. 6 crushed stone (Tochigi Kuzu produced) Condition: washing treatment spraying Temperature: 120 ° C. application ^{rate: 1.0 (m 3 / 100m 2} )

Table 1 shows the properties of the bituminous materials used.

[0046]

[Table 1]

[0047]

Example 2 A bituminous material and a foaming material were simultaneously sprayed using an experimental double-row sprayer, and the two were contacted and mixed in the air to form a layer of the foamed bituminous material on the road surface. The same bituminous material as that of Example 1 was used except that the spraying amount was 1.1 (l / m ² ), and the following materials were used as the foaming material. Other procedures were the same as in Example 1, and the spraying type surface treatment method of the present invention was applied to a road having a width of 1 m and a length of 2 m of the premises road as in Example 1.

<Foaming Material> Foaming material: 3% by weight aqueous solution of alicyclic surfactant Spraying amount: 0.1 (l / m ² ) Spraying temperature: 84 ° C.

[0049]

Example 3 The same bituminous material 10 used in Example 1
Into 0 volume parts, 3 volume parts of the same foaming material as used in Example 1 were introduced into a stirring type foaming machine created for the experiment, and stirred.
Blend by mixing, beforehand about 80 ℃ with heater planar
Was sprayed on a construction road surface having a width of 1 m and a length of 2 m heated by using an engine sprayer. The amount of application was 1.2 (l / m ² ) in terms of bitumen material before foaming. Immediately after spraying the foamed bituminous material, the same aggregate as used in Example 1 was sprayed. The spraying temperature and the spraying amount of the aggregate were the same as in Example 1. Then, the work was completed by sufficiently rolling the scattered surface of the aggregate with a vibrating roller in the same manner as in Example 1.

[0050]

Comparative Example 1 A spraying type surface treatment method was applied in the same manner as in Example 1 except that the foaming material was not sprayed.

[0051]

Comparative Example 2 A spraying type surface treatment method was applied in the same manner as in Example 2 except that the foaming material was not sprayed.

[0052]

Comparative Example 3 A spraying type surface treatment method was applied in the same manner as in Example 3 except that the foaming material was not used and the bituminous material was not foamed.

After curing for one day and night, a heavy load was loaded on a large test vehicle, and the above-mentioned Example 1 was applied at a speed of 30 km / h.
To 3, and repeatedly run on the surface treatment layers constructed according to Comparative Examples 1 to 3, and the state of each surface treatment layer was examined after a total of 72 hours.

As a result, in the sections of Examples 1 to 3, scattering of aggregate was hardly found, whereas Comparative Examples 1 to 3 were found.
In section 3, several traces of aggregates were found on the rut of the test vehicle. An attempt was made to peel off the aggregate at the tip of the driver or spatula, but in the sections of Examples 1 to 3, the aggregate was firmly attached to the road surface in all places and could not be removed. In the sections of Comparative Examples 1 to 3, there were places where the aggregate could be peeled off relatively easily in places such as the vehicle rut. From the above results, it can be seen that according to the spray surface treatment method of the present invention, the sprayed aggregate is extremely firmly attached to the road surface, and a robust surface treatment layer can be constructed.

[0055]

As described above, according to the spray surface treatment method of the present invention, the bituminous material to be sprayed foams and exists on the road surface in an increased volume, so that the flash phenomenon does not occur. Even if a bitumen material is used in a moderate amount, the surface of the aggregate to be sprayed can be widely and sufficiently covered, and the aggregates and the aggregate and the road surface can be firmly bonded. In particular, when the spray type surface treatment method of the present invention is performed using a work vehicle equipped with a bituminous material or foam spraying device and an aggregate spraying device, the spraying of the bituminous material or foam and the aggregate are performed. Or the spread of bituminous material and the spread of aggregate can be related to each other and managed as a consistent process, and a uniform and durable surface treatment layer can be easily and efficiently constructed. It is possible. As described above, according to the spray-type surface treatment method of the present invention, a strong and robust surface treatment layer can be easily constructed on the road surface, so that not only repair of existing pavements, but also new construction, This is an extremely useful and extremely useful invention because it can be used when constructing a surface layer comprising a binder and an aggregate on a pavement.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a surface treatment layer constructed by a conventional spray type surface treatment method.

FIG. 2 is an explanatory view of a spray type surface treatment method of the present invention.

FIG. 3 is an explanatory view of a spray type surface treatment method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Road surface 2 Bituminous material 3 Aggregate 4 Scattered aggregate

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Akihito Hokari 754 Inabago, Oyama-shi, Tochigi Pref.

Claims (9)

[Claims] 1. A spray surface treatment method comprising the steps of: forming a layer of expanded bituminous material on a road surface; and spraying aggregate on the layer of expanded bituminous material. 2. The bituminous material and the foaming material are sprayed simultaneously or before and after, and the bituminous material and the foaming material are contacted and mixed on the road surface and / or in the air to foam the bituminous material, and the foamed state is obtained. The method of claim 1, wherein the layer of bituminous material is formed on a road surface. 3. A foamed bituminous material layer is formed on a road surface by contacting, mixing and foaming a bituminous material and a foaming material, and spraying the foamed bituminous material on a road surface.
Spraying type surface treatment method described in 1. 4. The spray type surface treatment method according to claim 2, wherein the foaming material is water and contains 0 to 20% by weight of a foaming accelerator. 5. The method according to claim 1, wherein the bituminous material is a heated bituminous material. 6. The method according to claim 1, wherein the aggregate has a single particle size.
The spraying surface treatment method according to 4 or 5. 7. The method of claim 1 including the step of heating the road surface before forming a layer of bituminous material in a foamed state on the road surface.
The spraying type surface treatment method according to 2, 3, 4, 5 or 6. 8. The spraying surface treatment method according to claim 1, further comprising a step of rolling the surface on which the aggregate has been sprayed. 9. A single work vehicle equipped with at least a bituminous material dispersing device and a foaming material dispersing device and an aggregate dispersing device, or a foamed bituminous material dispersing device and an aggregate dispersing device. Claims 1, 2, 3, 4, 5, 6, 7 or 8 for use
Spraying type surface treatment method described in 1.