JP2005240398A - Permeable pavement, and construction method of permeable pavement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide permeable pavement eliminating causes of a flood and a heat island phenomenon to solve a water problem and a heat problem by securing a sure permeating function in a paved road. <P>SOLUTION: The permeable pavement 1 is constituted by forming a binder part 4 for joining a base course concrete part 2 and a surface layer concrete part 3 both formed of porous concrete and having permeability, at a boundary part 1X of the base course concrete part 2 and surface layer concrete part 3 so as not to block permeating holes 22, 32 opened to the surface of the base course concrete part 2 and the bottom face of the surface layer concrete part 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a water-permeable pavement and its construction method.

  The most important function of paved roads is to transmit traffic load safely to the ground, and to maintain predetermined functions such as smoothness and slip resistance within the required service life of the paved surface on which the vehicle passes. Concrete pavement is expected from the viewpoint of superior durability compared to asphalt pavement, although it requires an initial investment.

  In urban areas in recent years, the water environment and thermal environment have changed remarkably as the road pavement rate increases, and various problems have arisen. For example, with regard to the water environment, the water retention and recreational functions of the basin will decrease due to the change in the ground surface, making it difficult for rainwater to flow on the road surface. The arrival time of the plant will be accelerated and the scale will increase, increasing the risk of flood damage. Furthermore, since the infiltration of rainwater into the ground is reduced, the groundwater level is lowered and the river flow is reduced during normal times, leading to deterioration of water quality. In addition, regarding the thermal environment, the decrease in the water retention function of the ground due to the progress of paving causes a decrease in the cooling effect on the atmosphere due to moisture evaporation from the ground surface, and is also a factor in causing the heat island phenomenon particularly in urban areas.

Therefore, in order to solve the problems of the conventional water and heat environments as described above and to solve the problems of the conventional concrete pavement, in the concrete pavement, both the surface layer and the base layer are made of porous concrete. A stacking method with improved integrity has been considered (see, for example, Patent Document 1). In such a method, as in the conventional case, it is necessary to stack two or more layers instead of one layer due to the limitation of the capacity of the compacting device. However, in order to integrate porous concrete covering multiple layers. In addition, (a) adding a retarder to the previous layer (a layer directly below the concrete layer to be stacked) or blending for a long stacking time, (b) disturbing a part of the previous layer, After that, contrivances such as compaction to be united with a compaction device have been made.
Japanese Patent Laid-Open No. 2002-317403

  When the above-mentioned device is applied to the porous concrete pavement, the base layer and the surface layer can be integrated if the construction is performed smoothly.

  However, in the above pavement structure, the surface layer part is easy to dry, but the base layer part and below are difficult to dry.Therefore, there is a difference in humidity between the surface layer and the base layer concrete, and the resulting environmental temperature difference. There is a strict structural condition that the difference in thermal stress and the difference in thermal stress occur and the adhesive force at the interface between the two tends to decrease. In particular, when the water permeability coefficient of the surface layer portion is larger than the water permeability coefficient of the base layer portion, the portion below the base layer portion is more difficult to dry, and the conditions experienced by the surface layer and the base layer become more severe.

  Therefore, even if the base layer and the surface layer can be integrated, a high level of enforcement management is required to ensure the required adhesion performance and water permeability performance at the same time.

  That is, in the case of the above (a), when the environmental temperature is high or the wind is strong, sufficient adhesion strength can be obtained only by adding a retarder to the previous layer or taking a long stacking time. However, if the amount of the retarder is excessive or the blending is inappropriate, not only the adhesion strength but also the water permeability coefficient may be excessively lowered, and there is a problem that the effect is easily influenced by environmental conditions.

  Next, in the case of (b), the capability of the compacting device is required to be high, and the thickness of the layer that can be integrated is limited, and the part of the previous layer that has been partially disturbed is a weak point of adhesion. It may become.

  Therefore, in view of the above problems, the present invention provides a water-permeable pavement that can truly cope with a water environment and a thermal environment, and can solve the problems of various conventional concrete pavements, and a construction method thereof. The main purpose is to do.

  That is, the water-permeable pavement of the present invention comprises a base layer concrete portion made of porous concrete and having water permeability, and a surface layer concrete portion made of porous concrete and laid on the upper portion of the base layer concrete portion. Permeable water that opens at the boundary between the surface of the base layer concrete portion and the bottom surface of the surface layer concrete portion, the binder portion joining the base layer concrete portion and the surface layer concrete portion at the surface of the base layer concrete portion and the bottom surface of the surface concrete portion The holes are formed so as not to close the holes.

  In the case of pavement having such a configuration, since the binder portion is provided at the boundary portion between the base layer concrete portion and the surface layer concrete, the base layer concrete portion and the surface concrete portion having a degree comparable to the tensile strength of the porous concrete itself. Bonding strength can be obtained. In addition, since the binder portion is formed so as not to block the water-permeable holes that open at the boundary portion, the water-permeable performance based on the water-permeable holes of the porous concrete as the entire pavement structure is exhibited and the rainwater is surfaced. It can be infiltrated into the soil through the concrete part, the boundary part, and the base concrete part. Therefore, in addition to improving the water environment described above, where rainwater flows all over the surface of the pavement, causing flooding and river water quality deterioration, it retains rainwater in the soil and evaporates it into the atmosphere when dry, causing the heat island phenomenon. It can also help to improve the thermal problem of eliminating it. In addition, the water-permeable pavement according to the present invention is not limited to one having a two-layer structure of a base layer concrete portion and a surface layer concrete portion, and one having a concrete multilayer structure of three or more layers is also included.

  The binder part is preferably made of a cement-based non-shrink grout material, which can be said to be suitable in terms of construction workability, adhesion strength, durability, and the like.

  The construction method of the present invention for constructing the water-permeable pavement as described above includes a base layer concrete portion forming step of laying base layer concrete made of porous concrete and having water permeability, and a binder for applying a binder to the surface of the base layer concrete portion. A coating step, a binder partial removal step for removing the binder applied to the water-permeable holes opened on the surface of the base layer concrete portion, and a surface layer concrete having water permeability made of porous concrete from above before the binder is cured. Including a surface concrete portion forming step.

  By partially removing the binder applied to the surface of the base layer concrete part in this way and constructing the water permeable pavement, the water permeable holes are blocked at the boundary part between the base layer concrete part and the surface layer concrete part. No binder part can be formed. As a result, there is no problem in strength and durability as described above, and a sufficient water permeability function based on the pores of porous concrete as a pavement structure as a whole is ensured, which is an effective countermeasure for water and thermal environments. A permeable pavement can be constructed.

  In particular, in the binder application process, the binder is applied using a roller having an application surface, and in the binder partial removal process, the binder is partially removed using a brush having a hair tip intermittently. It is effective to form the above-mentioned binder part. On the other hand, using a roller with a brush having an application surface on which a binder can be applied and a brush portion having a hair tip provided intermittently, the binder application step and the binder partial removal step are simultaneously performed in one step. If done, the working time can be shortened and the construction cost can be reduced.

  As described above, it is extremely effective to apply a cement-based non-shrink grout material to the binder portion.

  As described above in detail, in the present invention, at the boundary portion between the base layer concrete portion made of porous concrete and the surface concrete portion, the binder portion provided for joining the two layers is made almost uniform over the entire surface. And by providing partially, permeable pavement is formed. Therefore, the state where the water-permeable hole of the base layer concrete part and the water-permeable hole of the surface concrete part communicated is realized, and the water-permeable function of the paved road can be obtained with certainty. As a result, rainwater permeates and is retained on the roadbed and roadbed without flowing on the surface of the paved road, so that not only the improvement of groundwater, vegetation and underground ecology, but also the suppression of the heat island phenomenon by reducing the road surface temperature. It is possible to effectively solve the water problem and the heat problem.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A water-permeable pavement 1 according to this embodiment shown in FIG. 1 is composed of a base layer concrete part 2, a surface layer concrete part 3, and a binder part 4 interposed at the boundary part between the base layer concrete part 2 and the surface layer concrete part 3. Is. In addition, although a roadbed layer, a roadbed improvement layer, etc. can be separately provided between the base layer concrete part 2 and the roadbed which is soil, in this embodiment, these roadbed layers and roadbed improvement are provided. It does not matter whether or not the layer exists.

  The base layer concrete portion 2 is obtained by kneading cement, an admixture, fine aggregate, water, an admixture (not shown) and a large number of coarse aggregates 21 on the surface. The particle size of the coarse aggregate 21 is, for example, about 5 to 20 mm, and the water / binding material ratio is, for example, 20.0 to 35.0%. And the porosity of such base layer concrete part 2 is about 10 to 15%. In such a base layer concrete part 2, a gap is formed between the coarse aggregates 21, and this gap is used as the water permeable hole 22.

  Similar to the base layer concrete portion 2, the surface concrete portion 3 is obtained by kneading cement, an admixture, a fine aggregate, water, an admixture (not shown) and a large number of coarse aggregates 31 on the surface. The particle size of the coarse aggregate 31 is, for example, about 2.5 to 15 mm, and the water / binding material ratio is, for example, about 20.0 to 35.0%. And the porosity of the surface concrete part 3 is set to about 15 to 25%. In such a surface concrete portion 3, a gap is formed between the coarse aggregates 31, and this gap is used as the water permeable hole 32.

The binder part 4 includes a binder 41 that joins the base layer concrete part 2 and the surface concrete part 33. In this embodiment, the binder 41 is applied over almost the entire boundary portion 1X between the base layer concrete portion 2 and the surface concrete portion 3, and the amount applied is, for example, about 1 to ² L / m ² per unit area. Yes. However, the binder 41 is applied so as not to completely block the water-permeable holes 22 of the base layer concrete portion 2 and the water-permeable holes 32 of the surface concrete portion 3 in the boundary portion 1X. Here, when the base layer concrete portion 2 and the surface concrete portion 3 are cement-based materials, for example, cement slurry, cement mortar, polymer cement mortar, cement-based grout material, or cement-based non-shrink grout material is used as the binder 41. It is preferable to apply. When the binder 41 is used for construction of a paved road, high fluidity is required from the viewpoint of work efficiency when it is applied to a relatively large area, and it can be used for a long time without causing cracks in the joint surface due to shrinkage. Since it is necessary to endure, among the binders exemplified above, a cement-based non-shrink grout material such as “Filcon R” manufactured by Sumitomo Osaka Cement Co., Ltd. can be used.

  Hereinafter, the construction method of the water-permeable pavement 1 of this embodiment is demonstrated.

  First, porous concrete is placed in an uncured state on the upper part of the road bed, the road bed improvement layer or the road bed layer, and the base layer concrete portion 2 is formed by laying and compacting with a compacting device (FIG. 2A); Base layer concrete part formation process).

  Next, a process of applying the binder 41 to the surface of the base concrete part 2 (binder application process) and a process of partially removing the binder 41 (binder partial removal process) are performed. These two steps are carried out simultaneously using a roller 5 with a brush as shown in 2 (b). That is, the roller 5 with brush has a peripheral surface of a cylindrical main body 50 as an application surface 51 and a brush portion 52 in which a large number of brushes protrude from the peripheral surface. When the binder 41 is attached to the application surface 51 of the brushed roller 5 and the main body 50 is rotated in a predetermined direction (right side in the illustrated example), the binder 41 once adheres to the surface of the base concrete portion 2. The adhered binder 41 is peeled off by the brush portion 52. In particular, since the brush portion 52 that has entered the water-permeable hole 22 from the surface side of the base concrete portion 2 scrapes the binder 41 from the water-permeable hole 22, at least a part of the water-permeable hole 22 is open upward. (FIG. 2 (c)).

  Finally, porous concrete is cast from above in an uncured state of the binder 41, and is spread and compacted by a compacting device with a compacting device to form a surface concrete portion 3 (FIG. 2 (d); base layer Concrete part formation process). In this state, the water-permeable holes 32 of the surface concrete portion 3 and the water-permeable holes 22 of the base layer concrete portion 2 are partially in communication (FIG. 2D), so that the water-permeable pavement 1 as a whole is permeable. Function is secured.

  Here, the adhesion strength test and the water permeability test performed on the water-permeable pavement 1 of the present embodiment will be described.

  According to the water-permeable pavement 1 of this embodiment constructed by such a method, the binder portion 4 is formed at the boundary portion 1X between the base layer concrete portion 2 and the surface concrete portion 3 both made of porous concrete and having water permeability. Since it is provided over substantially the entire region, although partially, with respect to the boundary portion 1X, it is possible to obtain adhesion strength substantially the same as that of the conventional water-permeable pavement. And since the binder part 41 is provided in the boundary part 1X so as not to block all the water-permeable holes 22 of the base concrete part 2 and the water-permeable holes 32 of the surface concrete part 3, the water permeability of the water-permeable pavement 1 as a whole. The function can be fully demonstrated. Therefore, since rainwater can be poured into the soil through the surface concrete portion 3, the boundary portion 1X, and the base concrete portion 2, the rainwater is held in the soil without flowing at once at the pavement surface. As a result, it is possible to improve the water environment without causing problems such as floods and river water quality deterioration, and it is also possible to improve the heat island phenomenon by transpiration of rainwater retained in the soil into the atmosphere during drying. .

  In addition, although the water-permeable pavement 1 which concerns on this embodiment can be applied regardless of a general road and a highway, it does not necessarily have to apply this water-permeable pavement 1 to the whole paved road. For example, in parts where adhesion performance is likely to be impaired due to warping stress due to drying shrinkage, such as the edge of a pavement near the shoulder of a road, especially in parts corresponding to the axle position of large vehicles where heavy loads are likely to act, the binder part Even if the partial removal step 41 is not performed and the water-permeable hole is partially blocked, the binder partial removal step is performed on the other part of the boundary portion 1X to open the water-permeable hole, and the entire road It is sufficient if it has a water permeability function.

  Moreover, although the example which performed the binder application | coating process and the binder partial removal process simultaneously using the roller with a brush was shown in the said embodiment, these two processes do not prevent performing separately. That is, after the base layer concrete portion forming step, even if the entire surface of the binder is first coated on the surface and then the binder is partially removed, the water-permeable pavement equivalent to the above embodiment can be obtained.

  In addition, specific composition of each part such as composition of base layer concrete part, surface concrete part, binder part, such as applying asphalt type thing to porous concrete, applying something other than non-shrinkage cement grout material to binder However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

Sectional drawing which shows schematically the water-permeable pavement which concerns on one Embodiment of this invention. Explanatory drawing which shows the construction process of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water-permeable pavement 2 ... Base-layer concrete part 3 ... Surface layer concrete part 4 ... Binder part 5 ... Roller with brush 22 ... Water-permeable hole 32 ... Water-permeable hole 41 ... Binder 51 ... Application surface 52 ... Brush part

Claims (6)

A base layer concrete portion made of porous concrete and having water permeability, and a surface concrete portion having water permeability made of porous concrete laid on top of the base layer concrete portion,
At the boundary between the surface of the base layer concrete part and the bottom surface of the surface layer concrete part, a binder part that joins the base layer concrete part and the surface layer concrete part is provided with a water-permeable hole that opens at the surface of the base layer concrete part and the bottom surface of the surface layer concrete part. A water-permeable pavement characterized by being formed so as not to be blocked. The water-permeable pavement according to claim 1, wherein the binder portion uses a cement-based non-shrink grout material as a binder. Base layer concrete part forming step of laying base layer concrete made of porous concrete and having water permeability, binder application step of applying a binder to the surface of the base layer concrete part, and binder applied to the water permeable holes opened on the surface of the base layer concrete part A method for constructing a water-permeable pavement, comprising: a binder partial removing step of removing a surface layer; and a surface concrete portion forming step of laying a surface layer concrete made of porous concrete and having water permeability before the binder is cured. . The water permeable water according to claim 3, wherein the binder is applied using a roller having an application surface in the binder application step, and the binder is partially removed using a brush having a hair tip intermittently in the binder partial removal step. Construction method for pavement. The binder application step and the binder partial removal step are simultaneously performed in one step by using a roller with a brush having an application surface on which a binder can be applied and a brush portion having a bristles provided intermittently. The construction method of the water-permeable pavement of 3 description. The method for constructing a water-permeable pavement according to claim 3, 4 or 5, wherein a cement-based non-shrink grout material is applied to the binder part as a binder.

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