JP5227159B2 - Road marking construction method - Google Patents

Description

The present invention relates to a method for constructing road markings such as road marking lines, stop lines, pedestrian crossings, and speed limits.

The heat-melt type coating material generally used for road markings tends not to adhere to the road surface and to easily peel off when the road surface construction site is wet. For this reason, it is necessary to avoid the road marking after rainy weather, and the weather has had a great influence on the construction period.

In this connection, Patent Document 1 discloses a road sign strip characterized in that when a sign strip having a fixing agent on the lower surface is attached to a road surface, the strip is attached through a flame that contacts the road surface at the same time. An attachment method is disclosed.

Japanese Unexamined Patent Publication No. 62-21911

However, the road marking construction method as described in Patent Document 1 is effective when the wetness of the road surface is extremely small, but when the wetness is large, such as after rain, to the extent that the necessary adhesion of the road marking can be obtained. In order to dry a road surface, there existed a problem that the drying process which makes a flame contact a road surface had to be performed for a long time.

Therefore, the present invention provides a road marking construction method that can be constructed in a short time even on wet road surfaces such as after rain.

In order to achieve the above object, the present invention is configured as follows.
That is, the road marking construction method according to the present invention includes a step of spraying a water-absorbing material on the road construction site,
A step of sweeping the sprayed water-absorbing material and removing it from the construction site;
It includes a step of providing a road marking at a construction location from which the water absorbing material has been removed.

According to the road marking construction method according to the present invention, the water absorbing material is sprayed on the road construction site, so that the moisture on the road surface can be absorbed and dried in a short time. Moreover, since it includes the step of sweeping the dispersed water-absorbing material and removing it from the construction site, the water absorbed by the water-absorbing material does not adversely affect the subsequent steps.

Further, the water absorbing material may be any one of a water absorbing polymer, quicklime, silica gel, a plurality of these may be used in combination, and only the water absorbing material may be used alone, or the water absorbing material may be used. You may make it contain in other materials, such as making a material into a sheet form. By using these for the water absorbing material, the road surface can be dried in a short time due to its high water absorbing performance.
Also, when using a flame to dry the road surface, it is necessary to partially dry the road surface with a burner, etc., so if the construction range where the road marking is large is required, Although the process requires a very long time, if the above water-absorbing material is used, the entire construction area can be dried at once by attaching the water-absorbing material to the entire construction area, so the road surface can be dried in a short time. Can be made.
If the water-absorbing material is formed into powder or granules containing water-absorbing polymer, quicklime, silica gel, etc., even if the construction range is wide by spreading the water-absorbing material, the water-absorbing material can be attached to the road surface at once. This is preferable.
Moreover, if the water absorbing material is formed into a flexible sheet containing a water absorbing polymer, quicklime, silica gel, etc., the water absorbing material attached to a wide construction range can be easily removed and recovered.
Moreover, the time which drying requires can be adjusted by adjusting the usage-amount of the said water absorbing material according to the environmental conditions, such as the wet condition of the road surface which performs construction, and humidity.

According to the road marking construction method of the present invention, moisture is removed in a short time by the water-absorbing material even on a wet road surface, and the road marking can be constructed.

Embodiments of the present invention will be specifically described with reference to the drawings.
Figure 1 shows a typical road marking.
FIG. 2 is a diagram showing a construction machine used for road marking construction.
FIG. 3 is a table showing the road marking construction method and its adhesion strength test results according to the present invention using various water-absorbing materials.

FIG. 1 shows a general road marking as seen from a plan view.
On the road surface, road markings, stop lines, pedestrian crossings, character displays showing information such as speed limits and "stop" are given everywhere, and these are mainly constructed using hot-melt paint. ing. As this construction method, a method in which a powdered hot-melt paint is heated and melted to adhere to the road surface and then cooled and solidified to be closely fixed to the road surface is mainly used. In addition, after placing the hot-melt paint formed in the sheet shape of the shape to be pre-marked on the construction surface, it is softened by heating from above and attached to the construction surface, and then cooled and solidified in the same manner as in the above method. A fixing method is also often used.

The hot-melt paint is composed mainly of a binder resin, a plasticizer, a colorant, a filler, a reflector, and the like.
Petroleum resins are generally used as the binder resin, but thermoplastic resins such as raw rosin, maleated rosin ester, polyamide resin, unsaturated polyester resin, and xylene resin may be used. Further, as the plasticizer, vegetable oil, vegetable oil-modified alkyd resin, mineral oil, phthalate ester, etc. are used, as the colorant, titanium dioxide, chrome lead, etc., and as the filler, calcium carbonate is generally used, Silica sand, cold water sand, talc and the like may be used. Moreover, when a reflective material is mix | blended for night visibility of a coating film, generally a glass bead is used, and also an antisettling agent, antioxidant, etc. are mix | blended suitably as an additive. The binder resin, the plasticizer, the colorant, the filler, the reflector, etc. are those that are generally used for constituting the hot-melt paint, and are not necessarily essential. Any other material may be used as long as it constitutes a hot-melt paint.

In the construction method according to the present invention, after removing moisture on a construction surface such as a road with a water-absorbing material as described above, the hot melt paint is applied by a construction machine.
FIG. 2 is a diagram showing a construction machine used for construction of road markings.
The construction machine 1 has a gas heating and melting device 12 mounted on a carriage 11.
Inside the gas heating and melting apparatus 12, a melting pot for heating and melting the powdered hot-melt coating material and a gas burner for heating are internally provided. The melting pot is formed in a bottomed cylindrical shape with an open top, and the gas burner is arranged so that the bottom of the melting pot is along the outside of the side wall. A lid 16 is provided on the upper surface of the gas heating and melting apparatus 12 so as to be openable and closable. By opening the lid 16, the hot-melt coating material can be introduced into the melter installed inside.

The melting kettle is heated by a gas burner placed on the outside, and the hot-melt coating material charged therein is melted, but a stirring blade is incorporated inside the melting kettle so that the hot-melt coating material can be heated uniformly. . The stirring blade is connected to a handle 17 provided on the upper surface of the gas heating and melting device 12, and by rotating the stirring blade, the stirring blade is rotated to stir the hot-melt paint applied to the melting pot.

An opening leading to the discharge port portion 13 is formed in a part of the outer periphery of the lower portion of the melting pot so as to be openable and closable. By opening the opening portion, the hot-melt paint melted in the melting pot is discharged. It is possible to flow into. The discharge port portion 13 is provided so as to protrude to the side of the carriage 1, and the hot melt paint that has flowed into the discharge port portion 13 by opening the opening / closing plate 14 provided at the end of the discharge port portion 13. Is attached to the construction surface below the end of the discharge port 13 to construct the road marking.
In this embodiment, the width of the discharge port portion 13 is formed to be the same size as the road marking line, and the road melting line is caused to flow out from the discharge port portion 13 while the construction machine 1 is moved. Can be constructed continuously.

FIG. 3 is a table showing the road marking construction method and its adhesion strength test results according to the present invention using various water-absorbing materials.
Examples and comparative examples are described below.

In the construction method of Example 1, water is sprayed with a hose so that it is uniformly wet on the road surface of asphalt pavement first, and then a polyacrylic acid soda powder, which is a kind of water-absorbing polymer, is used as a water-absorbing material in the construction range. Scatter.
After 5 minutes from spraying, the water-absorbing polymer on the road surface in the construction range is removed and collected by sweeping with a broom.
Next, a primer is constructed in the construction range, and a hot-melt paint for road marking is constructed thereon.

The construction method of Example 2 was performed in the same manner as in Example 1 except that silica gel powder was used as the water absorbing material.

The construction method of Example 3 was performed in the same manner as in Example 1 except that quick lime powder was used as the water absorbing material.

The construction method of Comparative Example 1 was carried out after performing a drying operation of irradiating a flame using a nozzle-shaped gas burner having a diameter of 60 mm for 5 minutes on the construction area sprayed on the road surface as in Example 1. A primer and a hot-melt paint were applied in the same manner as in Example 1.

The construction method of Comparative Example 2 was constructed in the same manner as Comparative Example 1 except that the drying operation was performed for 10 minutes.

The construction method of Comparative Example 3 was constructed in the same manner as Comparative Example 1 except that the drying operation was performed for 20 minutes.

The construction method of Comparative Example 4 is the same method as in Example 1 without performing a drying operation using a water absorbent or a gas burner on the construction range sprayed on the road surface similar to that in Example 1. Primer and hot melt paint were applied.

The method of adhesion strength test is to apply a 50 mm wide chisel on the applied hot melt paint film and destroy the paint film by hitting the back of the handle with a hammer. , Was used.
As a pass / fail judgment standard, the standard of good adhesion strength was that the coated film having a uniform size was not removed when the coated film was destroyed.

As shown in FIG. 3, for Examples 1 to 3 where the road surface was dried using a water absorbing material, Comparative Examples 1 and 2 where the road surface was dried using a gas burner, and comparison where the road surface was not dried Unlike Example 4, the adhesion strength of the coating film of the hot-melt paint was good. Among the examples, Example 1 using the water-absorbing polymer showed a better adhesion strength because the maximum size of the peeled coating film was smaller than those in Examples 2 and 3.
Comparative Example 3 in which the road surface was dried using a gas burner showed good adhesion strength of the coating film, but required a longer drying time than each Example.

In Example 1, sodium polyacrylate is used as the water-absorbing polymer, but the water-absorbing polymer used as the water-absorbing material of the present invention is not limited to this, and conventionally known ones are used alone or in combination. be able to. For example, starch, crosslinked carboxylmethylated cellulose, acrylic acid or a polymer or copolymer of acrylic acid alkali metal salt, polyacrylic acid and its salt, and polyacrylate graft polymer can be used. In addition, a comonomer such as maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate or styrenesulfonic acid is added to acrylic acid. A copolymer obtained by copolymerization can also be used.

Since the road marking construction method according to the present invention removes moisture from the construction surface such as a road with a water absorbent material, the road marking is provided from above, so applicable road markings include road marking lines, stop lines, pedestrian crossings, etc. It is not limited to character display such as line markings, figure markings, speed limits, etc., but can also be applied to color pavement and color painting to color sidewalks and bicycle roads, etc. Also implemented in these road markings Is possible.

It is a figure showing a general road marking. It is a figure showing the construction machine used for construction of a road marking. It is a table | surface showing the construction method of the road marking which concerns on this invention using various water absorbing materials, and its adhesion strength test result.

DESCRIPTION OF SYMBOLS 1 Construction machine 11 Bogie 12 Gas heating melting apparatus 13 Discharge port part 14 Opening / closing plate 16 Cover part 17 Handle

Claims (2)

A process of spraying a water-absorbing material on construction points on the road surface;
A step of sweeping the dispersed water absorbing material and removing it from the construction site;
A road marking construction method comprising a step of providing a road marking at a construction location from which the water absorbing material has been removed. The road marking construction method according to claim 1, wherein the water absorbing material is at least one of a water absorbing polymer, quicklime, and silica gel.

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