JPS62194302A - Method for repairing water permeability of paving body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention is mainly used to impart water permeability to existing pavement structures such as various sidewalks, light traffic roads, parks, plazas, etc., or to restore water permeability. This article relates to a water permeability improvement method for improving water permeability.

(Conventional technology) In recent years, technology for structures, buildings, road paving, etc. has developed.
Not only in urban areas but also in rural areas, the amount of exposed natural ground has decreased, and even a small amount of rainfall causes a large amount of rainwater to concentrate in drainage ditches, often causing localized flooding. In addition, because rainwater is discharged into rivers etc. without penetrating into the ground, the underground morphology may change due to lack of soil moisture, depletion of shallow groundwater, rise in underground temperature, lack of underground oxygen, etc. arise,
It has also had a negative impact on the growth of vegetation, making it extremely difficult to promote urban greening. Furthermore, the overuse of groundwater, which has become scarce, will accelerate land subsidence (by the way, groundwater accounts for 36% of all industrial water in Japan)... This caused various administrative problems.

In order to alleviate these problems, permeable pavement has recently been applied to sidewalks, etc.

A list of permeable pavement construction methods that have been put into practical use is: ■ A method in which large aggregates are hardened with a small amount of asphalt to form permeable holes in the layer, allowing rainwater to permeate into the base. It is called so-called open-grain ascon, and is currently most commonly used.

■Water permeability holes are formed in the layer in the same way as when coarse aggregate and cement resin mortar are mixed in an aggregate-rich manner, and paving is performed on the base layer.

■Place concrete sidewalk boards on top of the base to allow water to permeate through the joints.

■ Mortar interlocking blocks with a thickness of 6 to 8 marks are butted together in various shapes, and the joints are filled with sand to allow water to permeate through the joints.

etc.

(Problems to be Solved by the Invention) However, modifying existing asphalt or concrete pavement into water-permeable pavement by the above method requires extremely large-scale construction work and a long period of time. The reality is that it cannot be carried out in the evening.

In addition, even if permeable pavement is once created by the above method, it has the drawback that it does not have sufficient water permeability and cannot maintain water permeability over a long period of time, as described below. It was an undeniable fact that it was only in name. Namely, ■: asphalt hydrolyzes with water, resulting in strength deterioration, and the hydrophilic nature of the surface makes it easy for dust to adhere, leading to severe clogging and loss of water permeability in a short period of time. In addition, since the bonding force of asphalt is weak, the amount of asphalt relative to the aggregate must be increased, and the porosity decreases accordingly, so that much water permeability cannot be expected.

■ The strength deterioration due to the action of water is less than ■ and greater than the bonding force, but since the surface is still hydrophilic, it is easy for dust to adhere to it, causing clogging in a short period of time as above. .

■ Since the joints between the sidewalk boards are used as water permeable areas, the effective water permeable area is small, and if this is made too large, the individual sidewalk boards become unstable (so-called dancing occurs) and the entire pavement structure tends to collapse. Become.

■ has better water permeability than ■, has a high design of the painted surface, and has been widely adopted recently, but the permeable area is linear and the absolute effective water permeable area is /11. Dust tends to concentrate in this area and cause clogging.

In addition, since the joints are filled with fine sand, they become dense and large permeability is not expected, grass etc. grow in the joints and the appearance deteriorates, and furthermore, the action of the blocks (the blocks move when walking) causes the sand to become more dense. As the particles become finer, dense packing progresses further, and water permeability further decreases.

The present invention was made in view of the above-mentioned circumstances, and aims to provide a simple and effective method for improving the water permeability of an existing pavement for imparting or restoring water permeability to an existing pavement. .

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained based on the attached drawings. Fig. 1 is a longitudinal cross-sectional view of a water-permeable pavement body showing an example of application of the method of the present invention, Fig. 2 is a partially cutaway perspective view of a resin concrete molded body adopted in the method, and Fig. 3 is the same as that of Fig. 2. (2) An enlarged view of the lined part, FIG. 4 is a diagram similar to FIG. 1 of another application example, and FIG. 5 is a diagram similar to FIG. 1 of still another application example. That is, the method for improving the water permeability of a pavement according to the present invention involves partially removing the pavement surface of the existing pavement structure A, and adding a large number of granular aggregates 1
... are mutually bonded with a small amount of synthetic resin binding material 2, and contain a large number of water permeable holes 3..., and have approximately the same shape as the above-mentioned removed part a.
A water-permeable porous resin concrete molded body 4 molded to the same dimensions is fitted into the removed portion a, or a large amount of granular aggregate]--and a small amount of a kneaded mixture of synthetic resin binder 2 is inserted into the removed portion a. Adding water permeability to the pavement structure A by filling and hardening the removed portion a to form a water permeable porous resin concrete layer 5 having a large number of water permeable holes 3 in the layer, or The gist of this is to restore water permeability.

A water-permeable porous resin concrete molded body 4 or a resin concrete layer 5 is made by bonding a large number of granular aggregates to each other with a synthetic resin binding material 2, and has a large number of continuous water-permeable holes 3 in the layer. (see Fig. 3), and desirable granular aggregates include various types of gravel, natural sand, No. 2.3 silica sand, or granulated slag with a particle size of 1 to 15 nwn. In particular, it is preferable that the shape be round and the particle size be relatively uniform, as this will reduce the amount of binding resin used, increase the porosity, and improve the appearance. Gravel collected near rivers and estuaries or on the coast is suitable. Examples of the synthetic resin binder that binds the aggregates together include hydrophobic synthetic resin binders such as urethane, epoxy, polyester, and acrylic (preferably methyl methacrylate), which have particularly excellent weather resistance and water resistance. Preferred are urethane and epoxy resins, especially liquid-based moisture-curing urethanes, whose curing is accelerated by the action of moisture in the air, so when they are mixed with aggregate, they quickly harden when they come into contact with the air in the voids. , which is extremely advantageous in handling. The mixing ratio of the granular aggregate and the binding resin liquid should be determined to such an extent that the aggregates can be bonded to each other. For example, when the above-mentioned gravel with an average particle size of 5 strokes is bonded using a one-component moisture-curing urethane. A one-component moisture-curing urethane of 2 to 10 parts (solid weight) is suitable for 100 parts (weight) of gravel, and a porosity of 25 to 35% can be obtained. That is, if the amount of urethane is less than 2 parts, it will be difficult to achieve complete bonding between the gravels, while if it exceeds 10 parts, the voids between the gravels will be filled with excess binding material, so the resin liquid sag and close the voids, reducing the porosity. Such resin concrete molded body 4 or resin concrete layer 5 alone has a water permeability comparable to that of a gravel layer.

A water-permeable porous resin concrete molded body 4 is produced by placing a side formwork 41 made of plastic or metal on the second side of a vinyl sheet (not shown), and placing the above-mentioned granular aggregate 1 in this formwork 41. . . and the synthetic resin binding material 2 is filled and hardened, and then the vinyl sheet etc. are removed. A molded body integrally provided with a formwork 41 as shown in FIG. 2 is preferably employed. It goes without saying that this formwork 41 functions to shape the resin concrete into a desired shape during hardening and molding, but it is also possible to transport and fit the resin concrete even if it is not completely hardened yet, and to fit it into the removed portion a. When equipped, it also has the function of protecting the resin concrete molded body 4 from abrasion stress caused by walking or the like. The shape thereof may be appropriately determined depending on its application, such as a shape similar to a flower-shaped interlocking block as shown in FIG. 2, or a rectangular plate shape such as an ordinary concrete sidewalk board.

In addition, the resin concrete layer 5 is formed at the construction site, and the removed portion a1 is regarded as a formwork, and the kneaded material is loaded and hardened thereon, and is formed integrally with the non-removed portion.

If the target pavement structure A is an impermeable structure and the lower layer B of the pavement surface is also impermeable (when it is made of clay or other hard ground), these layers are removed at the same time and a crusher run is performed on the natural ground C. After forming the water-permeable layer 6 of the layer 61 and the sand layer 62, if necessary, a water-permeable reinforcing body 7 such as a metal net is formed.
It is desirable to form a resin concrete layer 5 in which a resin concrete molded body 4 is placed (
(See Figures 4 and 5). At this time, crusher run layer 6
If a water-permeable sheet 63 is interposed between the sand layer 62 and the sand layer 62, the sand can be prevented from being washed away. In addition, when using the above-mentioned reinforcing body 7,
It is necessary to integrate it into the resin concrete molded body 4 in advance, or to lay a reinforcing body 7 of the same size on the removed part a and apply cement paste to the inner circumferential wall of the removed part a, or to apply cement paste to the periphery of the reinforcing body 7. It is not excluded that after fixing the parts with the cement paste, the above-mentioned kneaded material is charged and hardened to form the resin concrete layer 5.

Existing pavement structures A to which water permeability should be imparted or restored include a water permeable pavement body made of interlocking blocks A1 as shown in FIG. 1, and a non-water permeable pavement body made of asphalt A2 as shown in FIGS. 4 and 5. , or, although not shown in the figure, concrete ring impermeable pavements and all other existing water permeable reinforcements made by the above method are targeted. When partially removing these pavement structures A, it goes without saying that the placement and number of parts to be removed should be determined appropriately, taking into consideration the overall water permeability. In the case of permeable pavement, it is necessary to specifically target areas that are severely clogged for removal, or to set the placement and number of parts to be removed, taking into account the design matching with the areas that will not be removed.

(Function) - In the north method, in the case of Fig. 1, the interlocking block A1 is appropriately removed, and the molded body 4 formed in the same shape and size as the block A is removed from the removed portion a.
The water permeability of the pavement structure A can be easily restored by fitting it into the pavement structure A. In addition, in a pavement made of interlocking blocks, the water permeable surface is linear, so the effective water permeable area is small and sufficient water permeability is not expected. Water permeability as a material improves dramatically. In addition, as shown in Figs. 4 and 5, appropriate parts of the asphalt pavement A2, which is originally impermeable to water, are cut off and the concrete molded parts 4 are inserted into the removed parts a (Fig. 4). Alternatively, by forming a resin concrete layer 5 on the removed portion a in the manner described above (FIG. 5), the non-water permeable pavement structure A can be modified to be water permeable.

Since such resin concrete has extremely high water permeability, rainwater during normal rainfall can quickly permeate and be absorbed into the ground even if the entire pavement structure A is not replaced with it. also,
Since the substance that binds aggregate 1... to each other is a synthetic resin, the bonding force is large, and the amount of aggregate 1... to be used can be reduced, making it possible to increase the porosity accordingly. , the porous structure is not easily affected by water and is maintained for a long time. Furthermore, since the aggregate 1... is covered with the synthetic resin binding material 2, the fine irregularities on its surface are filled, and it is made substantially hydrophobic, there is no adhesion of yA dust and almost no clogging. Become. By appropriately combining the water-permeable portion and the non-removed portion, the synthetic resin binding material 2 constituting the water-permeable portion may be colored appropriately, or the granular aggregate 1 may be closed and colorful gravel or the like may be used. This makes it possible to improve the fashionability of the finished appearance of the paved surface, and also to form a walking belt for the blind by utilizing the non-slip properties of the sections where cyclists run and the surface of the water-permeable parts.

(Example) The present invention will be explained in more detail by referring to Examples below.

(Example-1) (i) Adjustment of existing water-permeable pavement structure: The blocks on the water-permeable pavement surface covered with flower-shaped interlocking blocks were removed at a rate of 5 blocks per 1 m.

(i]) Preparation of a water-permeable porous resin concrete molded body; Place a plastic side formwork molded in a shape similar to a flower-shaped interlocking block on a vinyl sheet, and place gravel (gravel size 10 mm or less and 5 m or less is 5% or less), 30 parts by weight of hard urethane (manufactured by Resident Bayer Urethane ■, product name: Sumidur E-21-4,
M, D, ■, isocyanate content 5ttt, 16%] 1
After curing and curing the mixture, the vinyl sheet was removed to obtain a concrete molded body integrally equipped with a side formwork.

(ni) Fitting the resin concrete molded body; The resin concrete molded body prepared in (if) was fitted together with the side formwork into the removed portion of the block.

(i-) Water permeability test: A 1 m square embankment was watertightly constructed on the surface of the pavement obtained above, and when 1000 ml of water was poured into this section, approximately 100 ml of water was poured into this section.
Water completely permeated in 3 seconds. From this, 0.780 gloss of water per 1 second per 1 d permeates, and the water permeability coefficient is calculated as 9.70X]-0-2 cc/see.

This and the "approximate values of hydraulic conductivity of typical soils" in Table 1 below.
(Quoted from the Permeable Pavement Handbook/edited by the Japan Road Architectural Design Association), it is comparable to the permeability coefficient of sand, and from this it can be understood that it has approximately the same permeability as sand.

(Left below) Table 1: When the above water permeability is converted into an hourly rate, it is 3477.
mm/hour, therefore, even if it rains heavily, rainwater will not accumulate on the pavement surface, and under normal conditions, the resin concrete molded body will be installed in one piece for every 36 existing interlocking blocks (i.e., 1 m"). It is understood that sufficient water permeability is maintained even if the ratio is 1 per unit.

(Example-2) (i) Adjustment of impermeable pavement structure; On the pavement surface paved with open-grain asphalt, 10×60 mark sections are provided at a rate of 2 per 1 m, and the asphalt of this section is The surface was removed and a synthetic fiber non-woven fabric was laid on the crusher run directly below it, a sand layer was placed on top, and a metal net was laid.

(Road) Adjustment of water-permeable porous resin concrete molded body; Place the side formwork molded to approximately the same shape and dimensions as the removed part in (i) on a vinyl sheet, and place the resin concrete molded body in Example 1 above. The kneaded material was filled into this mold to obtain a resin concrete molded body in the same manner as above.

(in) Fitting the resin concrete molded body; The molded body obtained in (ii) was fitted into the above-mentioned removed portion.

(tv) Water permeability test; When a water permeability test was conducted in the same manner as above, the water permeability coefficient was 8.
69 x 10-2/sec, indicating sufficient water permeability.

(Example 3) A resin concrete mixture similar to that described above was charged and hardened to the removed portion of the impermeable pavement structure prepared in Example 2 to form a resin concrete layer.

When a water permeability test was conducted in the same manner as above, the water permeability coefficient was lb
- A high level of water permeability of 9.42 x 1O-2 an/sec was obtained.

It should be noted that, without being limited to the above embodiments, for example, if the aggregate used in the resin concrete molded body is made fine in the surface layer and coarse in the lower layer, a water-permeable surface made of fine aggregate is exposed on the surface, resulting in a good appearance. In addition, the frictional force applied to individual aggregates when walking is small, so the so-called raging of the aggregates is reduced, and dust that temporarily adheres to the upper part is pushed downward by the action of rainwater, and the lower layer with large voids is Since the water passes through without being retained, the overall effect of maintaining a state in which it is difficult to get clogged can be obtained. Furthermore, resin concrete was obtained by kneading 25 parts by weight of Kashima sand (particle size 5 to 7 fields) and 1 part by weight of the same urethane resin as above, and when the same water permeability improvement as above was performed, the appearance was extremely good.
Furthermore, it was possible to obtain a pavement having an excellent water permeability with a water permeability coefficient similar to that described above.

(Effects of the Invention) As described in Section 2, the water permeability improvement method of the present invention is a resin concrete molded body or resin concrete molded body having a large number of continuous water permeable holes in the layer by bonding aggregates with a synthetic resin binding material. The purpose is to add or restore water permeability to an existing pavement structure by fitting or forming a resin concrete layer on the part of the existing pavement structure where the pavement surface has been partially removed. , these objectives can be achieved extremely easily and quickly. Moreover, the resulting pavement has a larger effective permeable area than the conventional interlocking method, and has low reactivity with water, so there is no collapse of the permeable layer or clogging due to this, and the binding strength of the synthetic resin is reduced. is large, so the amount of binding resin to the aggregate can be reduced,
The porosity increases accordingly, making it possible to maintain water permeability at a high level. Furthermore, since the hydrophobic synthetic resin comes into contact with rainwater in the water permeable area, it is difficult for water to adhere to the walls of the water permeable hole, and dust is not attached via the adhering water. ability lasts for a long time. By appropriately combining water-permeable parts and non-water-permeable parts (non-removable parts), the water permeability can be changed according to the conditions of the construction site, and the design or fashionability can be improved to match the surrounding environment. I can do it.

As described above, the method of the present invention has many outstanding advantages that should be noted, and it will greatly contribute to urban greening, drainage projects, etc.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a water-permeable pavement body showing an example of application of the method of the present invention, Fig. 2 is a partially cutaway perspective view of a resin concrete molded body adopted in the method, and Fig. 3 is the same as that of Fig. 2. (2) An enlarged view of the lined part, FIG. 4 is a diagram similar to FIG. 1 of another application example, and FIG. 5 is a diagram similar to FIG. 1 of still another application example. (Explanation of symbols)

Claims (1)

[Claims] 1. The pavement surface of the existing pavement structure is partially removed, a large number of granular aggregates are bonded together with a small amount of synthetic resin binder, and a large number of water permeable holes are formed. A water-permeable porous resin concrete molded body formed to approximately the same shape and size as the removed part is fitted into the removed part, or a mixture of a large amount of granular aggregate and a small amount of synthetic resin binder is added to the removed part. Water permeability was imparted to the pavement structure or water permeability was restored by filling and hardening the removed portion to form a water permeable porous resin concrete layer having a large number of water permeable pores within the layer. Method for improving water permeability of pavement. 2. The repair method according to claim 1, wherein the resin concrete molded body is provided with a side form made of plastic or metal integrally bonded.