JP2016079592A - Pavement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pavement structure which can avoid an occurrence of flood disaster in a case of a local heavy rainfall such as guerrilla-type heavy rain while a roadbed is prevented from being damaged due to moisture and which can be constructed easily.SOLUTION: A pavement structure 100 comprises a water-shielding layer 20 laid on a roadbed 10, a base course 30 formed on the water-shielding layer 20, a pavement layer 40 formed on the base course 30, and a gutter 50 installed in the area adjacent to the base course 30 in a substantially horizontal direction, and a drain passage 51 which is drainage means for causing the moisture gathered on the water-shielding layer 20 to flow into the gutter 50 is installed. The water-shielding layer 20 is formed of a synthetic resin-made water-shielding sheet material, and the base course 30 is formed by installing and solidifying a mixture of crushed stone material, a cement-based solidified material, a nodulizing agent and water, on the water-shielding layer 20, and the pavement layer 40 is formed by installing and solidifying porous asphalt or porous concrete on the base course 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pavement structure having water permeability and water retention.

  In recent years, local heavy rains and heavy rains called guerrilla heavy rains have frequently occurred in Japan. Guerrilla torrential rain is a sudden and localized torrential rain caused by cumulonimbus clouds, and it is difficult to predict.

  In general, drainage facilities have been established so that rainfall that has poured into urban areas and residential areas flows into the ditches and drains through a predetermined drainage route. When a large amount of rain falls on paved roads, rainwater that has become unable to penetrate into the roadbed overflows and flows out of the pavement surface, often causing flooding in neighboring areas.

  In order to prevent the occurrence of such water damage, the present applicant has proposed a pavement structure having water permeability and water retention (see, for example, Patent Document 1). Since this pavement structure has a function of absorbing and retaining rainwater that has poured onto the pavement surface, it is possible to prevent the rainwater from overflowing or flowing out of the pavement surface.

  On the other hand, as conventional techniques related to the present invention, there are, for example, “water-permeable structure and construction method for water-permeable structure” described in Patent Document 2 or “drainage pavement and its construction method” described in Patent Document 3.

JP 2012-2111430 A JP 2009-68240 A JP 2010-112042 A

  As described above, the pavement structure described in Patent Document 1 has moderate water permeability and water retention, and can absorb and hold rainwater that has poured onto the road surface, so that rainwater overflows or flows out of the pavement surface. However, in recent years, there are aspects that cannot be handled when local heavy rain falls within a short period of time, such as frequent guerrilla rainstorms. is there.

  Further, the water-permeable structure described in Patent Document 2 and the drainage pavement described in Patent Document 3 also have the function of absorbing rainwater that has poured onto the road surface and draining it. It is difficult to cope with local heavy rainfall such as guerrilla heavy rain. Furthermore, since the water-permeable structure described in Patent Document 2 must be embedded in the ground in a standing state, the construction is troublesome.

  Therefore, the problem to be solved by the present invention is to avoid the occurrence of flood damage in the case of heavy rain such as guerrilla heavy rain, and the roadbed is not damaged by moisture, and the pavement is easy to construct. To provide a structure.

  The pavement structure of the present invention is formed by placing a water-impervious layer laid on the road floor, a kneaded product of a crushed stone material, a cement-based solidifying agent, an aggregating agent and water on the water-impervious layer. A roadbed, a pavement layer formed by placing porous asphalt or porous concrete on the roadbed, and a side groove provided in a region adjacent to the roadbed in a substantially horizontal direction, on the water shielding layer. A drainage means for allowing the collected moisture to flow into the side groove is provided.

  When a mixture of a crushed stone, a cement-based solidifying agent, and an aggregating agent is placed on a water-impervious layer laid on the roadbed, individual crushed stones are adjoined by the action of ions in the aggregating agent. Between them, the rock granule component contained in the crushed stone material and the cement-based solidifying agent form a three-dimensional aggregate structure, and continuous voids are generated. Therefore, the roadbed having both water permeability and water retention is formed on the impermeable layer.

  Accordingly, moisture such as rainwater that has poured onto the surface of the pavement layer penetrates the pavement from the pavement layer and is temporarily retained in the voids present in the aggregate structure in the subgrade, and cannot be retained in the subbase. Moisture descends in the roadbed, is collected on the water-impervious layer, and flows into the lateral groove through the drainage means.

  For this reason, when a large amount of rainwater pours onto the surface of the pavement layer, the rainwater passes through the pavement layer and is temporarily stored in the roadbed. It is possible to prevent rainwater that has poured onto the pavement layer and rainwater that has fallen into the surrounding area of the pavement structure from flowing into the side groove at the same time.

  As a result, it is possible to avoid the occurrence of flood damage when a heavy local rain falls within a short time, such as guerrilla heavy rain. Moreover, since the water retained (stored) in the roadbed does not penetrate downward from the water-impervious layer, the roadbed is not damaged by the water.

  Furthermore, the pavement structure of the present invention forms the roadbed and the pavement layer on the water-impervious layer laid on the road floor, and allows moisture collected on the water-impervious layer to flow into the lateral groove. Since it can be constructed by providing drainage means, construction is also easy.

  Here, it is desirable to provide a drainage path that communicates the roadbed and the side groove as the drainage means.

  Further, the water shielding layer can be formed by laying a water shielding sheet on the road floor.

  Furthermore, as the aggregating agent, one containing a polymer compound composed of a composite of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneamine can be used.

  According to the present invention, it is possible to avoid the occurrence of flood damage in the case of heavy local rain such as guerrilla heavy rain, and it is possible to provide a pavement structure that does not damage the roadbed due to moisture and can be easily constructed.

It is a vertical sectional view showing a pavement structure which is an embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. 1. It is a figure which shows the construction procedure of the roadbed which comprises the pavement structure shown in FIG.

  Hereinafter, the pavement structure 100 which is embodiment of this invention is demonstrated based on FIGS. 1-3. As shown in FIGS. 1 and 2, the pavement structure 100 of the present embodiment includes a water shielding layer 20 laid on the road floor 10, a road bed 30 formed on the water shielding layer 20, and a road bed 30. A drainage means that includes the formed pavement layer 40 and a side groove 50 provided in a region adjacent to the roadbed 30 in a substantially horizontal direction, and allows water collected on the water shielding layer 20 to flow into the side groove 50. A certain drainage channel 51 is provided.

  The water shielding layer 20 is formed by laying a synthetic resin water shielding sheet material on the road floor 10. As shown in FIG. 3, which will be described later, the roadbed 30 is solidified by placing a kneaded material 5 of a crushed stone material 1, a cement-based solidifying agent 2, an aggregating agent 3, and water 4 on a water-impervious layer 20. Is formed by. The pavement layer 40 is formed by placing porous asphalt (or porous concrete) on the roadbed 30.

  The side groove 50 is a concrete side groove block 52 in a state in which the side groove 50 is in contact with a vertical cross section of the water shielding layer 20, the roadbed 30, and the pavement layer 40 in a region substantially adjacent to the water shielding layer 20, the roadbed 30, and the pavement layer 40. It is formed by arranging. The side groove block 52 is a cylindrical member having a water passage 53 therein, and a plurality of drainage passages 51 are provided in a state of penetrating the lowermost portion of the side wall portion 54 in contact with the roadbed 30 or the like. The drainage path 51 communicates the lowermost part of the roadbed 30 (the part directly above the water shielding layer 20) and the water passage 53 of the side groove block 52.

  As shown in FIG. 2, the drainage path 51 is substantially horizontal, the outer opening 51 a of the drainage path 51 faces the roadbed 30, and the lowermost part of the inner opening 51 b is the bottom 55 of the water passage 53. It is continuous with the upper surface 55a. The upper surface 55a of the bottom 55 of the water passage 53 has a bowl shape in which a cross-sectional shape in a plane orthogonal to the longitudinal direction (water flow direction) of the water passage 53 is recessed downward. The lowermost part of the bottom 55 a is located below the inner opening 51 b of the drainage channel 51. The plurality of drainage channels 51 are provided at predetermined intervals along the longitudinal direction of the water flow channel 53.

  Here, based on FIG. 3, the construction procedure of the roadbed 30 which comprises the pavement structure 100 is demonstrated. As shown in FIG. 3, 40 to 120 kg of cement-based solidifying agent 2, 1 to 2 liter of aggregating agent 3 and an appropriate amount of crushed stone material 1 (particle size: 0.075 mm to 40 mm) The kneaded material 5 is formed by mixing with water 4. The aggregating agent 3 includes a polymer compound made of a composite of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneamine. Although "(trade name) SS-M1" diluted 30 to 60 times with water is used, it is not limited to this.

  As shown in FIG. 1, the side groove block 52 is arranged on the road bed 10 that has been leveled in a predetermined shape, and is laid so that the side edge portion of the water shielding sheet material contacts the outer surface of the side wall portion 54 of the side groove block 52. The water shielding layer 20 is formed.

  Thereafter, when the kneaded product 5 formed in the above-described process is placed on the water-impervious layer 20 shown in FIG. 1 and rolled, the ions in the aggregating agent 3 are in the process of solidifying the kneaded product 5. As a result of the above, between the adjacent crushed stone particles 1a, a rock component contained in the crushed stone material 1 and the cement-based solidifying agent 2 form a three-dimensional aggregate structure, and a continuous void is formed. As it occurs, the voids are solidified by the action of the cement-based solidifying agent 2 to such an extent that they are not destroyed by external force, so that a roadbed 30 having both water permeability and water retention is formed on the water shielding layer 20.

  Thereafter, when porous asphalt (or porous concrete) is cast on the roadbed 30 and solidified to form the pavement layer 40, the pavement structure 100 having water permeability and water retention is completed.

  Moisture such as rainwater that has poured onto the surface 40 a of the pavement layer 40 located at the top of the pavement structure 100 permeates from the pavement layer 40 toward the roadbed 30 and in the voids present in the aggregate structure in the roadbed 30. Moisture that could not be held in the road bed 30 descends in the road bed 30 and is collected on the impermeable layer 20, flows into the water flow path 53 in the side groove 50 through the drainage path 51, and reaches a predetermined level. Flow down towards the drainage facility.

  Thus, when a large amount of rainwater has poured onto the surface 40 a of the pavement layer 40, the rainwater passes through the pavement layer 40 and is temporarily stored in the roadbed 30, and then into the side groove 50 with a time difference. Since it is discharged, it is possible to prevent rainwater that has poured onto the pavement layer 40 and rainwater that has fallen into the surrounding area of the pavement structure 100 from flowing into the side groove 50 at the same time.

  As a result, it is possible to avoid the occurrence of flood damage when a heavy local rain falls within a short time, such as guerrilla heavy rain. Moreover, since the water | moisture content hold | maintained (stored) in the roadbed 30 does not osmose | permeate below from the impermeable layer 20, the road bed 10 is not damaged by the water | moisture content.

  Further, the pavement structure 100 forms the roadbed 30 and the pavement layer 40 on the water-impervious layer 20 laid on the road floor 10, and the water collected on the water-impervious layer 20 flows into the side groove 50. Since it can be constructed if the drainage channel 51 is provided, the construction is also easy.

  In addition, the pavement structure 100 demonstrated based on FIGS. 1-3 shows an example of this invention, and the pavement structure of this invention is not limited to the pavement structure 100 mentioned above.

  The pavement structure of the present invention can be widely used in fields such as civil engineering construction as general roads such as roadways and sidewalks, or as pavement means such as parks, open spaces, and parking lots.

DESCRIPTION OF SYMBOLS 1 Crushed material 1a Crushed stone particle 2 Cement-based solidifying agent 3 Aggregating agent 4 Water 5 Kneaded material 10 Road bed 20 Water shielding layer 30 Roadbed 40 Pavement layer 40a Surface 50 Side groove 51 Drainage path 51a Outer opening 51b Inner opening 52 Side groove Block 53 Water passage 54 Side wall part 55 Bottom part 100 Pavement structure

Claims (4)

  A water-impervious layer laid on the road bed, a roadbed formed by placing a crushed material, a cement-based solidifying agent, an aggregating agent and water on the water-impervious layer, and porous asphalt or porous A pavement layer formed by placing concrete on the roadbed, and a side groove provided in a region adjacent to the roadbed in a substantially horizontal direction, and the moisture collected on the water-impervious layer is A pavement structure with drainage means to flow into the gutter.   The pavement structure according to claim 1, wherein a drainage path that communicates the roadbed and the side groove is provided as the drainage means.   The pavement structure according to claim 1 or 2, wherein a water shielding sheet is laid on the road floor to form the water shielding layer.   The pavement structure according to any one of claims 1 to 3, wherein the aggregating agent includes a polymer compound composed of a composite of a magnesium salt of acrylic acid / dimethylaminoethyl methacrylate copolymer and polyethyleneamine.

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