JP6346003B2 - Anti-slip method for asphalt pavement - Google Patents

Description

  The present invention relates to a slip prevention method for an asphalt pavement.

As a preventive repair method for asphalt pavement, particularly drainage pavement that has been increasing in recent years, a method of spraying asphalt emulsion has attracted attention because of its simplicity and low cost. This method is extremely excellent in terms of repairing cracks inside the asphalt pavement, restoring water barrier between the surface layer and the base layer, and suppressing the scattering of aggregates on the road surface, etc. By simply forming a film, the aggregate surface after construction is covered with a relatively thick asphalt film, and as a result, the slip resistance immediately after construction tends to be reduced.
In order to solve these problems, methods such as changing the composition of the emulsion, mixing and dispersing sand into the emulsion, and applying sand immediately after the emulsion application have been performed. However, these methods, for example, the method of changing the composition of the emulsion does not necessarily have sufficient performance after repair, or the method of using sand slips when the sand scatters immediately or is buried in the emulsion or resin. There were problems such as a small stopping effect.

  In order to eliminate these drawbacks, for example, a non-slip pavement method as disclosed in Patent Document 1 has been devised. In this method, sand is sprayed and a top coat mixed with sand is applied thereon.

  In this method, the above-mentioned drawbacks are solved to some extent. However, since sand is used, gaps are inevitably clogged by sand, and the essential drainage is reduced.

JP 2013-108223 A

  Then, the method of enlarging the slip resistance value while ensuring the drainage property of a drainage asphalt pavement is provided.

  In view of the situation as described above, the present inventor has completed the method of increasing the slip resistance value of the present invention as a result of earnest research, and its feature is as an aggregate scattering prevention for drainage asphalt pavement, Disperse the solidified material from the surface to form a solidified coating on the aggregate on the surface of the pavement, and then use a polishing tool to form streaky irregularities on the solidified coating on the surface aggregate of the surface of the pavement. There is in point to do.

  As compared with conventional dense-grained asphalt concrete, drainage asphalt pavement naturally has less binder, and therefore, the scattering of aggregates becomes larger. That is, if the vehicle body passing amount is the same, the time for the aggregate to scatter and a defective part to occur or a crack to occur is shortened. That is, the service life of the paved road is shortened.

  In order to prevent and reduce this, in order to prevent the scattering of the aggregate, the solidified material is sprayed and hardened from the surface of the pavement to reduce the scattering. Of course, it is assumed that the drainage is maintained.

  This surface spraying method of the solidified material is effective in preventing the scattering of the aggregate, but the aggregate is covered with the solidified material, which naturally becomes smooth and hardens. Therefore, since the solidified material is cured smoothly, the surface becomes very slippery from the rough surface before spraying. The solidifying material may be an asphalt emulsion, a modified asphalt mixed with a resin, or a resin alone that does not use asphalt. In short, any material can be used as long as it has fluidity and cures.

  You may mix a fine aggregate with this solidification material. For example, silica sand or other fine aggregates usually mixed with cement may be used.

  When this solidified material is cured or the final solidified product to be obtained is a tough resin or the like, after it is semi-cured, streaky irregularities are formed by a polishing tool. Here, what is necessary is just to be able to form an unevenness | corrugation in the hardening body of the solidified film surface with an abrasive | polishing tool. For example, a wire brush, a blast device, or other polishing tool may be used.

  Here, the surface aggregate refers to aggregate exposed on the road surface. However, not all exposed aggregates are required. Further, the surface aggregate of the surface layer portion is the top portion on the surface side of the road, and actually refers to the extent to which the tire of the automobile is deformed and contacts. However, this does not have to be the entire contact portion.

  The formation of the streaky unevenness on the solidified coating of the surface aggregate of the surface layer is formed by rubbing the solidified coating with a metal wire or the like. For example, streaky irregularities are generated in the solidified film by scratching the surface with a wire brush. As a wire brush, a wire brush having a wire diameter of about 0.2 mm to 0.4 mm is densely implanted, or a wire brush with about 50 to 100 metal wires twisted to increase the strength. It is preferable to densely implant. A certain load or more is applied to this and scratched horizontally with the road surface or rotated and scratched. One brushing is sufficient, and there is no problem even if the solidified film remains. Of course, the solidified film may be removed to some extent by brushing several times.

  In addition, when polishing by dragging a polishing machine equipped with a plurality of brushes, the width of each brush is 10 centimeters so that a load similar to that of the convex portion of the road surface is applied to the concave portion of the flange portion and other road surfaces. The following is preferred, and a mode in which they move independently and a constant load is applied.

The present invention has the following effects.
(1) Unevenness is formed in the smooth solidified film on the surface of the aggregate, and the solidified film becomes non-smooth, thereby increasing the slip resistance value.
(2) The operation is simple, and it is possible even if the solidified material is cured or semi-cured and then passes once with a polishing tool.

It is a fragmentary sectional view of the road which implements one example of the method of the present invention. It is a partial sectional view of a road showing an example of the method of the present invention. It is a partial sectional view of a road showing an example of the method of the present invention.

Hereinafter, the present invention will be described in more detail based on embodiments shown in the drawings.
Example 1
Asphalt emulsion (solid content 60%) from the surface of drainage pavement (5 years after pavement, cross section of this state is shown in Fig. 1. Since it is drainage, there is a gap between aggregates 1) Engraving degree 10) was sprayed with 0.5 L per 1 m ² to completely blacken the surface. A cross-sectional view of this state is shown in FIG.

  As shown in FIG. 2, each aggregate is coated with a solidified material, and the adhesive force between the aggregates is strengthened. Moreover, the porosity required for drainage is maintained, although the porosity is slightly reduced by the solidified coating. However, it can easily be imagined that the slip resistance is small because the fine irregularities on the surface of the aggregate 1 in FIG. 1 are covered with the solidified material 2 and become smooth. Actually, when sliding resistance (BPN) was measured at three points at this stage, it showed a low value as shown in Table 1 before the brush.

  Next, this pavement surface is an electric polishing cup-shaped wire brush in which 20 bundles of about 80 SUS metal wires having a wire diameter of 0.35 mm are twisted and arranged around a circle with a diameter of 70 mm. When sliding resistance was measured again after rubbing once with a load of 10 kg per cup-shaped wire brush, it was greatly improved as after the brush in Table 1. This state is shown in FIG. As can be seen from this figure, the fixation below and on the side of the aggregate does not change, and it can be seen that the surface is uneven. Therefore, the purpose of the solidified material on the surface layer portion was not lost, and the slip resistance value was recovered.

Example 2
After forming an asphalt film under the same conditions as above and measuring the slip resistance, thousands of brass metal wires with a wire diameter of 0.25 mm were implanted in a 15 mm width in a circumferential shape with an outer diameter of 70 mm and an inner diameter of 40 mm. When the sliding resistance was measured again after rubbing once with a cup-shaped wire brush for electric polishing with a load of 20 kg per cup-shaped wire brush, it was greatly improved as after the brush in Table 2.

1 Aggregate 2 Solidified coating

Claims (2)

In the method of spraying solidified material and forming solidified material on the aggregate on the surface of the pavement road, the solidified material is an asphalt emulsion, and once with a wire brush of a metal wire , to prevent the scattering of aggregate in drainage asphalt A method for increasing the slip resistance value of a paved road, characterized by forming streaky irregularities on the solidified coating of the surface aggregate of the surface layer portion of the paved road by brushing, and making the slip resistance value 64 to 86 BPN . The method for increasing a slip resistance value according to claim 1, wherein the wire brush has a wire diameter of 0.2 to 0.4 mm.

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