JP2021092096A - Method for strengthening water retentive pavement - Google Patents

Abstract

To provide a method for strengthening water retentive pavement capable of strengthening the water retentive pavement without impairing the function of the water retentive pavement.SOLUTION: A method for strengthening water retentive pavement includes: a pavement step (S110) of paving an open-graded base pavement 10; a cement milk filling step (S120) of filling voids of the base pavement 10 with a water retentive cement milk 30; a reinforcement layer forming step (S130) of spraying a breathable silicate 40 on the surface of the filled water retentive cement milk 30 to form a reinforcement layer 31 on the surface layer of the water retentive cement milk 30; and a surface treatment step (S140) of shot blasting or grinding the surfaces of the base pavement 10 and the reinforcement layer 31 after curing the water retentive cement milk 30.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method for strengthening a water-retaining pavement, which can strengthen the water-retaining pavement without impairing the function of the water-retaining pavement.

Conventionally, in water-retaining pavement, water-retaining cement milk containing a water-retaining material is filled in the voids of the pavement made of an open-grain asphalt mixture, and the rainwater retained during rainfall is evaporated in fine weather. It had the effect of removing heat from vaporization, reducing the temperature of the pavement surface, and improving the surrounding thermal environment.

However, the water-retaining cement milk containing the above-mentioned water-retaining material has a low strength, and there is a problem that the water-retaining cement milk is gradually crushed after the start of service of the water-retaining pavement to generate dust. In order to deal with such a problem, for example, as shown in Patent Document 1, a countermeasure has been proposed in which the compressive strength of the water-retaining cement milk itself is mainly increased.

Japanese Unexamined Patent Publication No. 2017-133272

However, the relationship between the strength of the water-retaining cement milk and the water-retaining amount is in a trade-off relationship with each other, and there is a problem that increasing the strength of the water-retaining cement milk reduces the water-retaining amount of the water-retaining cement milk.

On the other hand, as described above, when the conventional water-retaining cement milk is used as it is, the water-retaining cement is particularly used for shot blasting, cutting and polishing of the pavement surface of the water-retaining pavement. The hardened milk is crushed, which causes problems that not only dust is generated, but also the aesthetic appearance is impaired and the required amount of water retention itself cannot be secured.

Therefore, the present invention aims to strengthen the water-retaining pavement without impairing the function of the water-retaining pavement even when the pavement surface of the water-retaining pavement is shot-blasted or cut / polished. It is intended to provide a method of strengthening water-retaining pavement that is possible.

(1) A pavement step (S110) for paving an open-grained base pavement 10, a cement milk filling step (S120) for filling the voids of the base pavement 10 with water-retaining cement milk 30, and the filled water-retaining cement. A reinforcing layer forming step (S130) in which a breathable silicate 40 is sprayed on the surface of the milk 30 to form a reinforcing layer 31 on the surface layer of the water-retaining cement milk 30, and after the water-retaining cement milk 30 is cured, the above-mentioned A method for strengthening a water-retaining pavement 100, which comprises a surface treatment step (S140) of shot blasting or grinding the surfaces of the base pavement 10 and the reinforcing layer 31.

According to the configuration of (1) above, the water-retaining cement milk 30 impregnated with the breathable silicate 40 by spraying the breathable silicate 40 on the surface of the filled water-retaining cement milk 30. Since the reinforcing layer 31 having high strength and breathability can be formed on the surface layer, the water-retaining cement milk 30 can be applied even when the pavement surface 11 of the water-retaining pavement 100 is shot-blasted or ground. It is possible to obtain a special effect of suppressing large crushing and not impairing the functionality, aesthetics, durability, etc. of the water-retaining pavement itself.

In addition, by spraying the breathable silicate 40, it is possible to allow the rainwater that has fallen on the pavement surface 11 to be retained in the water-retaining material in the water-retaining cement milk 30 via the breathable reinforcing layer 31. Become. In particular, when the pavement surface 11 is shot blasted or ground as described above, the very surface portion of the water-retaining cement milk 30 impregnated with the excess breathable silicate 40 is removed, so that water retention from rainwater infiltration is removed. In fine weather, the water retained in the water-retaining material in the water-retaining cement milk 30 can be sufficiently evaporated into the atmosphere via the reinforcing layer 31.

(2) The method for strengthening the water-retaining pavement 100 according to (1) above, wherein the base pavement 10 is an open-grain asphalt concrete.

According to the configuration of (2) above, in addition to the effect of (1) above, general-purpose open-grain asphalt concrete can be used as the base pavement 10.

(3) Further, there is a joint cutting step of cutting joints on the surfaces of the base pavement 10 and the reinforcing layer 31, and in the joint cutting step, the surfaces of the base pavement 10 and the reinforcing layer 31 are cut at predetermined intervals. The method for strengthening the water-retaining pavement 100 according to the above (1) or (2), which is divided into predetermined dimensions and shapes.

According to the configuration of (3) above, in addition to the effect of (1) or (2) described above, a lithograph having a predetermined size and shape is stretched by cutting a joint having a predetermined size and shape. It is possible to form a lithograph-like water-retaining pavement 100.

(4) In the surface treatment step (S140), when the surfaces of the base pavement 10 and the reinforcing layer 31 are ground, a smooth and surrounding mirror image may be projected on the surfaces of the base pavement 10 and the reinforcing layer 31. The method for strengthening a water-retaining pavement 100 according to any one of (1) to (3) above, which forms a possible glossy ground surface.

According to the configuration of (4) above, in addition to the effect of any of (1) to (3) described above, the surfaces of the base pavement 10 and the reinforcing layer 31 can be ground to project a smooth and surrounding mirror image. By forming a possible glossy ground surface, it is possible to construct a water-retaining pavement 100, such as polished natural stone.

(5) The method according to any one of (1) to (3) above, wherein in the surface treatment step (S140), the surfaces of the base pavement 10 and the reinforcing layer 31 are shot blasted to form a granite-like pavement surface. How to strengthen the water-retaining pavement 100.

According to the configuration of (5) above, in addition to the effect of any of (1) to (3) described above, the surfaces of the base pavement 10 and the reinforcing layer 31 are shot blasted to obtain a granite-like water-retaining pavement 100. It is possible to build.

It is sectional drawing which shows the cross-sectional structure of the conventional water-retaining pavement. It is sectional drawing which shows an example of the pavement cross section in the Example of this invention. It is sectional drawing which shows typically the permeation mode of the breathable silicate in the Example of this invention. It is sectional drawing which shows typically the treatment mode of the pavement surface in the Example of this invention. It is a construction flow chart which showed the construction order in the Example of this invention.

Hereinafter, a method for strengthening the water-retaining pavement according to the embodiment of the present invention will be described with reference to the construction flow chart shown in FIG.

(Roadboard: S100)
FIG. 1 shows the cross-sectional structure of the conventional water-retaining pavement 1, but also in the cross-sectional structure of the water-retaining pavement 100 in this embodiment, a roadbed material made of crushed stone or the like is spread and leveled as in the conventional method. , A roadbed 20 having a thickness corresponding to the design thickness is constructed.

(Pavement of mother pavement: S110)
Subsequently, as shown in FIG. 2 and the like, the base pavement 10 which is the base of the water-retaining pavement 100 of this embodiment is paved. As the type of the base pavement 10, in this embodiment, open-grain asphalt concrete is used, and the base pavement 10 having a porosity of about 25% is constructed.

Since the water-retaining pavement 100 receives an external force in a water-retained state at a high temperature in summer, there is a high possibility that the asphalt will peel off from the aggregate. In addition, the water-retaining pavement 100 of this embodiment is a pavement as described later. It is preferable to use modified asphalt because the surface 11 is shot-blasted, cut and polished, and the like.

Further, the type of the base pavement 10 is not necessarily limited to asphalt concrete, and so-called porous concrete can be used as the base pavement 10, but it is more costly to use asphalt concrete as in this embodiment. It is more preferable in order to reduce the amount of concrete and improve the workability.

(Filling of water-retaining cement milk: S120)
Subsequently, in this embodiment, as shown in the cross-sectional view of FIG. 2, etc., the water-retaining cement milk 30 is filled in the voids of the base pavement 10 at a filling rate of 100%. At the time of filling, the water-retaining cement milk 30 is filled by appropriately using necessary equipment such as a rubber rake and a vibration compactor. In this embodiment, general-purpose water-retaining cement milk 30 containing a mineral-based water-retaining material is used.

(Formation of reinforcing layer: S130)
When a predetermined curing time elapses after filling the water-retaining cement milk 30, the breathable silicate 40 is sprayed on the pavement surface 11 using a sprayer as shown in the cross-sectional view of FIG. The breathable silicate 40 used in this example is diluted 2-fold with water and sprayed at an amount of ^{200 g / m 2 on the pavement surface 11.}

Further, the breathable silicate 40 used in this embodiment is impregnated into the water-retaining cement milk 30 from the pavement surface 11 as shown in the cross-sectional view of FIG. 3, and is formed on the surface layer of the water-retaining cement milk 30. It re-reacts with unreacted components and crystallizes. As a result, a reinforcing layer 31 is formed on the surface layer of the water-retaining cement milk 30, and it is possible to increase both the compressive strength and the bending strength as compared with the water-retaining cement milk 30 in which the breathable silicate 40 is not sprayed. It becomes.

In addition, since the reinforcing layer 31 formed of the breathable silicate 40 of the present embodiment is configured to have breathability, the rainwater that has fallen on the pavement surface 11 can be collected from the water-retaining material in the water-retaining cement milk 30. In fine weather, the rainwater retained in the water-retaining material in the water-retaining cement milk 30 can be evaporated into the atmosphere via the reinforcing layer 31. Therefore, it is possible to strengthen the water-retaining pavement 100 without impairing the original function of the water-retaining pavement.

(Shot blast processing: S140)
Subsequently, after the water-retaining cement milk 30 develops a predetermined strength, shot blasting is performed on the pavement surface 11 of the water-retaining pavement 100 of this embodiment, as schematically shown in the cross-sectional view of FIG. Perform processing.

By the shot blasting treatment, the asphalt and the aggregate surface on the surface of the aggregate 12 on the pavement surface 11 and the surface of the reinforcing layer 31 of the water-retaining cement milk 30 are scraped off. By performing such a treatment, it is possible to form the granite-like pavement surface 11 by the contrast between the color of the aggregate 12 itself and the color of the water-retaining cement milk 30.

That is, due to the effect of the reinforcing layer 31 formed by the above-mentioned breathable silicate 40, the low-strength water-retaining cement milk 30 is prevented from being largely scraped off by the shot blasting treatment, and the uniform color is aesthetically pleasing. It is possible to construct a granite-like water-retaining pavement 100 having excellent durability. In addition, since the pavement surface 11 is shot blasted, the very surface portion of the water-retaining cement milk 30 impregnated with the excess breathable silicate 40 is removed, so that the water retention is improved from the infiltration of rainwater. In fine weather, the water retained in the water-retaining material in the water-retaining cement milk 30 can be sufficiently evaporated into the atmosphere via the reinforcing layer 31.

[Other Examples]
Although one embodiment of the present invention has been described above with reference to the drawings, each technical configuration is not limited to the above-described embodiment.

For example, in the above embodiment, in the treatment of the pavement surface 11 of the water-retaining pavement 100, the one by the shot blast treatment is exemplified, but the treatment is not necessarily limited to such surface treatment and is parallel to the pavement surface 11. It is also possible to perform a process of smoothly grinding the pavement surface 11 by a grinding device provided with a grinding blade that rotates vertically or a grinding blade that rotates perpendicularly to the pavement surface 11.

By such a grinding process, it is possible to form a smooth and glossy ground surface capable of projecting a mirror image of the surroundings on the surface of the aggregate 12 and the surface of the reinforcing layer 31 of the water-retaining cement milk 30. Therefore, it becomes possible to construct a water-retaining pavement 100 like a polished natural stone.

Further, in order to improve the sliding resistance of the ground surface, the grinding blade may be ground by attaching a coarse grinding blade, whereby the sliding resistance can be adjusted. Similarly, in the shot blasting treatment, the surface texture of the pavement surface 11 can be adjusted by the treatment timing and the treatment time.

Further, in this embodiment, open-grain asphalt concrete was used as the type of the base pavement 10, but so-called porous concrete can also be applied.

It is also possible to use limestone, glass, or aggregate 12 having various colors as the aggregate 12 of the base pavement 10, which makes the entire pavement look brighter than when ordinary crushed stone aggregate is used. It is also possible to give various aesthetics and functionality, such as using glass to diffusely reflect light.

Further, a lithograph having a predetermined size and shape is formed by cutting joints having a joint width of 3 to 10 mm at predetermined intervals on the pavement surface 11 after shot blasting or grinding and partitioning the pavement surface 11 with a predetermined size and shape. It is possible to form a lithograph-like water-retaining pavement 100 as if it were stretched. Although it is possible to cut the joints before the shot blasting or grinding of the pavement surface 11, the corners of the joints may be chipped by the shot blasting or grinding, so shot blasting may occur. It is preferable to cut the joint on the pavement surface 11 after the treatment or grinding.

Further, in the above-mentioned embodiment, the breathable silicate 40 was diluted 2-fold with water and sprayed at an amount of 200 g / m2 on the pavement surface 11, but the concentration and spraying amount are not necessarily limited. However, it can be appropriately adjusted according to the type of treatment for the pavement surface 11 and the treatment timing (time).

Although the embodiments and other embodiments of the present invention have been described above, the specific configuration is not limited to these embodiments. The scope of the present invention is shown by the scope of claims rather than the description of the above-described embodiment, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

10 Mother pavement 30 Water-retaining cement milk 31 Reinforcing layer 40 Breathable silicate 100 Water-retaining pavement

Claims (5)

The pavement process of paving the mother pavement with open particle size and
A cement milk filling step of filling the voids of the base pavement with water-retaining cement milk,
A reinforcing layer forming step of spraying a breathable silicate on the surface of the filled water-retaining cement milk to form a reinforcing layer on the surface layer of the water-retaining cement milk.
A method for strengthening a water-retaining pavement, which comprises a surface treatment step of shot-blasting or grinding the surface of the base pavement and the reinforcing layer after the water-retaining cement milk is cured. The method for strengthening a water-retaining pavement according to claim 1, wherein the base pavement is an open-grain asphalt concrete. Further, it has a joint cutting step of cutting joints on the surfaces of the base pavement and the reinforcing layer.
The method for strengthening a water-retaining pavement according to claim 1 or 2, wherein in the joint cutting step, the surfaces of the base pavement and the reinforcing layer are cut at predetermined intervals and partitioned into predetermined dimensions and shapes. When the surfaces of the base pavement and the reinforcing layer are ground in the surface treatment step, a smooth and glossy ground surface capable of projecting a mirror image of the surroundings is formed on the surfaces of the base pavement and the reinforcing layer. The method for strengthening a water-retaining pavement according to any one of claims 1 to 3. The method for strengthening a water-retaining pavement according to any one of claims 1 to 3, wherein in the surface treatment step, the surfaces of the base pavement and the reinforcing layer are shotblasted to form a granite-like pavement surface.

Images