JP4636411B2 - Pavement water retention mat and pavement using the same - Google Patents

Description

  The present invention relates to a water retention mat for pavement and a pavement having a drainage pavement or a water permeable pavement using the same.

  2. Description of the Related Art In recent years, pavements that have been provided with drainage pavement or water-permeable pavement have been applied in roadways, sidewalks, parking lots, and the like for the purpose of improving vehicle running performance and improving the natural environment.

  As for the pavement which drainage pavement was given, the surface layer part is a water-permeable layer made of porous asphalt mixture with high porosity, and an impermeable layer made of asphalt mixture is provided directly under the water-permeable layer . Rainwater that falls on the road surface penetrates into the permeable layer without staying on the road surface, is guided along the drainage gradient on the upper surface of the impermeable layer, and into the road floor without draining into the drainage floor, etc. It flows into the drainage facility. Therefore, with this type of drainage pavement, rainwater does not collect on the road surface, so it is possible to improve the safety when driving the vehicle, and engine sound and tire air pumping sound are absorbed in the gap of the permeable layer. Therefore, traffic noise can be reduced.

  The surface of the pavement that has been subjected to water-permeable pavement is a water-permeable layer made of a porous asphalt mixture with a high porosity, and a roadbed is formed by laying crushed stones directly under the water-permeable layer. . And the rainwater which fell on the road surface penetrate | invades in a permeable layer, without staying on a road surface, and osmose | permeates to a roadbed via a roadbed from this permeable layer. Therefore, with this type of permeable pavement, rainwater does not accumulate on the road surface, it can be made easy to walk, and rainwater is returned to the ground, so it is possible to cultivate trees, etc. It can also improve the natural environment and suppress flooding of urban rivers.

  On the other hand, recently, the heat island phenomenon in which the temperature in urban areas in summer is abnormally high has become a problem. As a cause of this heat island phenomenon, the ground covered with soil and plants is replaced with concrete or asphalt pavement that easily stores heat, and concrete buildings increase, and these are exposed to sunlight during the day. It can be mentioned that it is heated to a high temperature and cooling does not proceed even after sunset.

  Even pavements with drainage pavements and water-permeable pavements such as those described above cannot retain rainwater sufficiently, the water-permeable layer is easy to dry, and the road surface is not subject to high temperatures. . Therefore, in this type of pavement, in order to contribute to the suppression of the heat island phenomenon, how to increase water retention and suppress the increase in road surface temperature was a technical problem to be improved.

  Therefore, recently, in a pavement subjected to drainage pavement, for example, as disclosed in Patent Document 1, a moisture absorption / release body having water retention is mixed in the water permeable layer, or disclosed in Patent Document 2. As described above, a structure having a water supply facility for supplying water in the permeable layer has been proposed.

Moreover, in the pavement subjected to the water-permeable pavement, for example, as disclosed in Patent Document 3, a water guide member that connects the water-permeable layer and the water storage tank so as to be able to conduct water is laid under the water-permeable layer. A structure with the above structure has been proposed. As the water guide member, a nonwoven fabric, a single superabsorbent polymer, a cloth containing a superabsorbent polymer, or the like is used.
JP 2004-68449 A JP 2004-169523 A Japanese Patent No. 3396475

  However, when the moisture absorbing / releasing body is mixed in the water permeable layer, when the moisture absorbing / releasing body absorbs rainwater, the gap of the water permeable layer is buried, and the original function of the drainage pavement is impaired. There are problems such as hindering safety and reduction of traffic noise when driving.

  Moreover, when providing a water supply equipment, installation of piping, a water tank, a pump, etc. is needed, and there exists a malfunction that a maintenance cost becomes troublesome while an installation cost increases.

  Furthermore, when connecting a water permeable layer and a water storage tank by a water conveyance member, there exists a malfunction that a water storage tank etc. are needed and an installation cost increases. In addition, a water tank is abolished, and a superabsorbent polymer that absorbs and retains water several hundred times its own weight, or a cloth containing a superabsorbent polymer, is placed under the permeable layer. It is conceivable to simply lay it on the side, but because there is no space for the superabsorbent polymer to absorb water and expand, even if the water retention amount is limited, or even if the superabsorbent polymer expands, There is a problem of causing adverse effects such as unevenness and cracks on the road surface.

  The present invention has been made to solve the above-mentioned conventional drawbacks, and its purpose is to increase the water retention of the pavement and stably suppress an increase in road surface temperature, and to reduce the equipment cost and It is an object of the present invention to provide a water retention mat for paving that can significantly reduce maintenance costs and prevent adverse effects on the road surface of the paving body, and a paving body using the same.

In order to solve the above problems, a water retention mat for pavement according to the present invention is a water retention mat for pavement 1 disposed inside or on the back side of the surface layer portions 33 and 43 having water permeability of the pavement, and absorbs water. Then, the water absorbing expansion body 4 that expands and the shape retaining body 5 that forms the expansion absorption space S into which the expansion portion of the water absorbing expansion body 4 enters are laminated.

The shape-retaining body 5 is formed by arranging a plurality of resin corrugated members 11... In parallel on the same plane, with the concave portions 15 of the corrugated members 11 .. and the corrugated members 11. The space between them is the expansion absorption space S.

Further, the water absorbent expansion body 4 and the shape retaining body 5 are sandwiched between a pair of water permeable sheet bodies 3 and 3.

Furthermore, by arranging the water absorbing and expanding body 4 so as to cover a part of the shape retaining body 5, a water retaining area 20 and drainage areas 21 and 21 are formed on the entire surface of the mat 1.

Furthermore, the water retention area 20 is formed over the substantially entire surface of the mat 1 by disposing the water absorbing / expanding body 4 so as to cover substantially the entire surface of the shape retaining body 5.

The water-absorbing expanded body 4 is made of a nonwoven fabric mainly composed of a water-absorbing polymer, and the water-absorbing expanded body 4 is mixed with a temperature-sensitive water-absorbing and draining resin 10.

  Further, the mat 1 has flexibility that can be bent or bent, for example.

  In the pavement of the present invention, a water-impermeable layer 32 is provided below the surface layer portion 33 having water permeability, and water that has permeated the surface layer portion 33 is guided along the upper surface of the water-impermeable layer 32 toward the road shoulder. The pavement water retaining mat 1 is disposed inside or on the back surface side of the surface layer portion 33. The pavement water retaining mat 1 is disposed so as to be discharged without penetrating into the road bed 30. It is characterized by that.

  Specifically, the pavement water retaining mat 1 is disposed on the side rear surface side along the shoulder of the surface layer portion 33, and a part of the mat 1 is raised along the side surface of the surface layer portion 33. The surface layer portion 33 is disposed inside.

  Furthermore, the pavement of another invention is configured such that a roadbed 42 and a roadbed 41 are provided below the surface layer portion 43 having water permeability, and water penetrates from the surface layer portion 43 to the roadbed 42 and the roadbed 41. The pavement water retention mat 1 is disposed inside or on the back surface side of the surface layer portion 43.

  In the pavement provided with the drainage pavement or the water-permeable pavement provided with the water retention mat for pavement of the present invention, when the rainwater falling on the road surface penetrates into the surface layer portion, the water-absorbing expansion body such as a water-absorbing polymer of the mat is formed. It absorbs rainwater and expands. When the surface layer portion dries at high temperatures or droughts in summer, the rainwater retained in the water-absorbing expansion body is gradually dissipated and moisture is continuously supplied to the surface layer portion. Deprives the road surface of heat and vaporizes, thereby suppressing an increase in road surface temperature.

  In other words, while having a simple structure that only lays mats, it is possible to stably suppress the rise in road surface temperature by increasing the water retention capacity of the pavement, thereby significantly reducing equipment costs and maintenance costs. This can contribute to the suppression of the heat island phenomenon.

  Moreover, even if the water absorbent expansion body of the mat absorbs rainwater and expands, the expanded portion enters the expansion absorption space of the shape retaining body, and the overall shape of the mat is almost the same as before the water absorption expansion body absorbs rainwater. It does not change. For this reason, the expansion | swelling of a water absorption expansion body does not produce an unevenness | corrugation, a crack, etc. on a road surface, and the bad influence to the road surface of a pavement can also be prevented.

  In addition, by mixing the temperature-absorbing and draining resin into the water-absorbing expansion body, water can be absorbed and retained when the road surface temperature is low, and water can be automatically discharged when the road surface temperature becomes high. An efficient water supply becomes possible with respect to a part, and road surface temperature can be suppressed more effectively.

  Furthermore, by forming a shape retaining body by arranging a plurality of resin wave-shaped members side by side on the same plane, the structure of the shape retaining body can be simplified and the mat manufacturing process can be simplified. it can. Moreover, the pressure-resistant flat strength can be increased by the corrugated member, and the mat is not crushed by the surface layer portion of the pavement, and the expansion absorption space is stably secured over a long period of time, thereby improving the reliability. Can do.

  Moreover, since the water-absorbing expansion body and the shape-retaining body are sandwiched between the water-permeable sheet bodies, entry of foreign matter such as soil and pebbles into the expansion absorption space of the water-absorbing expansion body is eliminated while allowing rainwater to penetrate into the mat. be able to. As a result, the expansion absorption space can be secured stably over a long period of time, and the reliability can be improved.

  In addition, by forming a water retention area and drainage area on the entire surface of the mat, rainwater can be quickly discharged from the pavement through the drainage area, impairing the original drainage function of the pavement with drainage or permeable pavement. It is possible to realize heat island countermeasures.

  Furthermore, by forming the water retention area over substantially the entire surface of the mat, the water retention capacity of the mat can be increased, and it is particularly effective for application to a pavement that tends to cause a high road surface temperature.

  In addition, if the mat is flexible, it can be wound and packed in a coil shape, for example, when shipped from the factory, and on the site, it can be made flexible following the shape of the pavement. The mat can be handled easily so that it can be laid.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a water retention mat for paving according to an embodiment of the present invention, and FIG. 2 is a perspective view of the water retention mat for paving.

  The water retention mat 1 for pavement is used for improving water retention of a pavement subjected to drainage pavement or water permeable pavement. As shown in FIGS. 1 and 2, a pair of water permeable sheet bodies 3 are used. 3, a water absorbing expansion body 4 that absorbs water and expands, and a shape retaining body 5 that maintains the flattening strength of the mat 1. And it is inserted | pinched by a pair of water-permeable sheet bodies 3 and 3 in the state in which the water absorption expansion body 4 and the shape-retaining body 5 were laminated | stacked.

  As shown in FIG. 3, the water-permeable sheet body 3 has a large number of water-permeable holes 8..., For example, by weaving vertical tape-shaped materials 6. It is formed in a net shape of ˜20 mesh. As the tape-like materials 6, 7,..., Thermoplastic synthetic resins having tensile strength such as polyethylene, polypropylene, polyamide, etc., which have been subjected to stretching treatment, can be used.

  The water-absorbing expansion body 4 is made of a strip-shaped nonwoven fabric mainly composed of a highly water-absorbing polymer having excellent water absorption and water retention, and absorbs and absorbs water several hundred times its own weight, and retains the absorbed water. Have the ability to The superabsorbent polymer has a three-dimensional network structure in which a mild cross-linking bond is introduced into a water-soluble electrolyte polymer having an ionic group, such as polyvinyl alcohol, acrylic, and polyether. Synthetic polymers, or starches, celluloses and other natural polymers are used as raw materials.

  The water-absorbing expansion body 4 is mixed with a temperature-sensitive water-absorbing and draining resin 10. This temperature-absorbing and draining resin 10 absorbs water into the resin when the temperature is low, and discharges water when the temperature rises and reaches the temperature-sensitive point. For example, it is commercially available under the trade name “Thermogel”. What is being used is used. The temperature-sensitive water-absorbing and draining resin 10 does not necessarily have to be mixed into the water-absorbing expanded body 4, but by mixing it, an effective water-draining function can be exhibited by reducing the road surface temperature of the pavement.

  As shown in FIGS. 1 and 4, the shape-retaining body 5 is configured by arranging a plurality of resin-like corrugated members 11... Is arranged. The corrugated member 11 includes an upper horizontal side portion 12 arranged at a predetermined pitch, a lower horizontal side portion 13 arranged at a predetermined pitch, an upper horizontal side portion 12 and a lower horizontal side portion 13. Consists of connecting vertical side portions 14..., Recesses 15... Opened upward and recesses 16 .. opening downward are alternately arranged along the longitudinal direction. The corrugated member 11 is formed by extrusion molding or the like using a thermoplastic resin such as polyethylene or polypropylene as a material.

This shape-retaining body 5 has a pressure-resistant flat strength that can withstand the heavy pressure of the pavement. That is, in order to prevent crushing due to heavy pressure, it is necessary that the width dimension W (see FIG. 1) and the wave pitch P (see FIG. 4) are balanced with respect to the thickness T (see FIG. 4) of the corrugated member 11. When the wall thickness dimension T is reduced or the wave pitch P is increased, the pressure resistance decreases. Further, if the thickness T is increased, the cost is increased. For this reason, although it changes with materials used, for example, when polyethylene resin etc. are used, the thickness dimension T of each corrugated member 11 is about 0.5-1.5 mm, and the width dimension W is about 5-20 mm. The wave pitch P is preferably about 5 to 20 mm, and the wave height H is preferably about 10 mm. In addition, in the mat 1 whose strength is increased by the shape-retaining body 5, the pressure load is 50 t / m ² and can be embedded in the pavement.

  And the expansion absorption space S is comprised by the clearance gap between each wavelike member 11 ... of this shape-retaining body 5 ..., and the wavelike member 11, ..., The water absorption at the time of water absorption is comprised in this expansion absorption space S The expansion part in the expansion body 4 enters.

  Next, the manufacturing method of the water retention mat 1 for pavement will be described. First, a large number of undulating members 11... Are arranged in parallel to each other at intervals on the same plane to form a shape retaining body 5, and this shape retaining body 5 is placed on one water-permeable sheet body 3, Both contact portions are fusion-fixed.

  Subsequently, the water absorbent expansion body 4 is placed on the shape retaining body 5 and the other water permeable sheet body 3 is placed so as to cover the water absorbent expansion body 4. At this time, as shown in FIGS. 1 and 2, the water-absorbing expansion body 4 is set such that the dimension in the width direction is smaller than the dimension in the width direction of the water-permeable sheet bodies 3 and 3 and the shape retaining body 5. 5 is continuously arranged in the longitudinal direction so as to cover the center portion in the width direction.

  And the water absorbing / expanding body 4 is internally fixed by fusing and fixing the contact portions of both ends of the shape retaining body 5 and both ends of the other water-permeable sheet body 3 and, in some cases, both ends of the water-permeable sheet bodies 3 and 3. The pavement water retaining mat 1 can be formed. The pavement water retention mat 1 is manufactured as a long body, and is used after being cut into a predetermined dimension according to the situation at the site.

  In the water retention mat 1 for pavement, the water absorbing / expanding body 4 is disposed so as to cover the central portion of the shape retaining body 5, and therefore, as shown in FIG. Are formed, and drainage regions 21 and 21 where the water-absorbing expansion body 4 does not exist are formed at both ends thereof.

  The water absorbing / expanding body 4 does not necessarily need to be disposed so as to cover the central portion of the shape retaining body 5, and may be disposed so as to cover substantially the entire surface of the shape retaining body 5, for example, as shown in FIG. 6. In this case, the water retention area | region 20 is formed over the substantially whole surface of the mat 1, and water retention can be improved. Furthermore, by disposing a plurality of water-absorbing expansion bodies 4... At a predetermined interval, the drainage area 21...

  Further, in the water retention mat 1 for pavement, since the shape retaining body 5 is composed of a plurality of corrugated members 11 arranged at intervals, the flexibility that can be bent or bent is provided. Thus, for example, at the time of factory shipment, it can be wound and packed in a coil shape, and on the site, flexible laying that follows the shape of the pavement and the like is possible.

  FIG. 7 shows an example in which the pavement water retention mat 1 is applied to a pavement subjected to drainage pavement. In this pavement, a roadbed 30, a roadbed 31 laid with crushed stones, a water impermeable layer 32, and a surface layer portion 33 having water permeability are laminated in order from the bottom, and along the road shoulder end of the surface layer portion 33,渠 34, 34 are arranged.

  The impermeable layer 32 is formed by, for example, laying an asphalt mixture and stepping and solidifying with a roller or the like so as to have a thickness of about 5 cm. The impermeable layer 32 is curved so that the upper surface formed as an impermeable surface rises slightly in the center portion. Yes.

  The surface layer portion 33 includes, for example, a water permeable layer 35 in which an asphalt mixture is spread in a porous shape having a high porosity, and is squeezed to a thickness of about 5 cm with a roller or the like. And a crushed stone layer 36 for storing water.

  Then, on the back side of the side portion along the shoulder of the surface layer portion 33, as shown in FIGS. 8 and 9, a plurality of pavements are sandwiched between the surface layer portion 33 and the impermeable layer 32 therebelow. The water retention mats 1 are arranged in a state of being arranged in the longitudinal direction of the pavement. The road shoulder side ends of the mats 1 are raised along the side surface of the water-crushing crushed stone layer 36 so as to be sandwiched between the surface layer portion 33, that is, the water-permeable layer 35 and the water-carrying crushed stone layer 36. It is folded. In this way, in the pavement subjected to drainage pavement for the roadway, the mat 1... Is disposed only at the end along the road shoulder so that the vehicle running portion of the road surface associated with the mat 1 is disposed. To minimize the impact on In addition, the length of the part arrange | positioned by the side part back surface side of the surface layer part 33 in this mat 1 is about 40-50 cm, and the length of the part embed | buried under the surface layer part 33 is 40 cm or less. However, these lengths are not particularly limited.

  In the mat 1 laid state, as shown in FIG. 9, a water retention area 20 and a drainage area 21 are sequentially arranged in the longitudinal direction of the pavement, so that not only the water retention function but also the drainage. By ensuring the function, the original function of the pavement with drainage pavement is not disturbed. Note that the mats 1... May be arranged so as to cover the entire back surface of the surface layer portion 33 if it does not hinder drainage and does not affect the road surface. Moreover, when using the mats 1... In which the water retaining region 20 is formed over substantially the entire surface, as shown in FIG. 10, for example, the mats 1 are disposed while leaving an interval for drainage in the longitudinal direction of the pavement.・ Put it in.

  In the pavement in which the mats 1 and so on are laid in this way, rainwater that has fallen on the road surface penetrates into the surface layer portion 33 without staying on the road surface, and toward the shoulder along the drainage gradient on the upper surface of the impermeable layer 32. Led. And a part of the rainwater led to the road shoulder direction is retained by passing through the water retaining area 20 of the mat 1... And the remaining rainwater passes through the draining area 21 of the mat 1. It flows into drainage facilities such as drainage grooves (not shown) without penetrating into the roadbed 30.

  In the water retention region 20 of the mat 1..., The water absorbing and expanding body 4 absorbs rainwater and expands to hold the rainwater. Moreover, the temperature-sensitive water-absorbing resin 10 mixed in the water-absorbing expansion body 4 also absorbs and holds rainwater. At this time, as shown in FIG. 5, since the expansion of the water absorbent expansion body 4 enters the expansion absorption space S of the shape retaining body 5, the overall shape of the mat 1 is almost the same as before the water absorption expansion body 4 absorbs rainwater. It does not change. For this reason, even if the water absorption expansion body 4 expand | swells, the surface layer part 33 is not pushed up, and the unevenness | corrugation and crack accompanying expansion of the water absorption expansion body 4 do not arise on a road surface.

  When the surface layer portion 33 dries at the time of high temperature or drought in summer, the rainwater retained in the water-absorbing expansion body 4 and the temperature-sensitive water-absorbing resin 10 is gradually dissipated, and moisture is retained in the surface layer portion 33. Is continuously supplied. And the water | moisture content in this surface layer part 33 takes the heat | fever of a road surface, and evaporates, and it can suppress the raise of road surface temperature by this.

  FIG. 11 shows an example in which the pavement water retention mat 1... Is applied to a pavement subjected to water permeable pavement. In this pavement, a road bed 41, a road bed 42 made of crushed stones, and a surface layer portion 43 having water permeability are laminated in order from the bottom. The surface layer portion 43 is composed of, for example, a water permeable layer in which an asphalt mixture is spread in a porous shape having a high porosity and is stepped on to a thickness of about 5 cm with a roller or the like.

  And on the back surface side of the surface layer portion 43, a plurality of pavement retention mats 1 are arranged in the longitudinal direction of the pavement so as to be sandwiched between the surface layer portion 43 and the roadbed 42 below the surface layer portion 43 It is arranged by.

  In the laid state of the mat 1..., As shown in FIG. 12, a water retention area 20 and a drain area 21 are sequentially arranged in the longitudinal direction of the pavement. By ensuring the function, the original function of the pavement with permeable pavement is prevented. Note that the mats 1... May be arranged not only so as to cover the entire back surface of the surface layer portion 43 but also distributed in necessary places. Moreover, when using the mats 1... In which the water retaining regions 20 are formed over substantially the entire surface, as shown in FIG. 13, for example, the mats 1 are disposed while leaving an interval for drainage in the longitudinal direction of the pavement.・ Put it in.

  In the pavement in which the mats 1 and so on are laid in this way, the rain water that has fallen on the road surface penetrates into the surface layer portion 43 without staying on the road surface, and a part of the rain water is retained in the water retaining region 20 of the mat 1. The water is retained by passing, and the remaining rainwater penetrates from the roadbed 42 to the roadbed 41 through the drainage area 21 of the mat 1.

  In the water retention region 20 of the mat 1..., The water absorbing and expanding body 4 absorbs rainwater and expands to hold the rainwater. Moreover, the temperature-sensitive water-absorbing resin 10 mixed in the water-absorbing expansion body 4 also absorbs and holds rainwater. At this time, as shown in FIG. 5, since the expansion of the water absorbent expansion body 4 enters the expansion absorption space S of the shape retaining body 5, the overall shape of the mat 1 is almost the same as before the water absorption expansion body 4 absorbs rainwater. It does not change. For this reason, even if the water absorption expansion body 4 expand | swells, the surface layer part 43 is not pushed up and the unevenness | corrugation and crack accompanying expansion of the water absorption expansion body 4 do not arise on a road surface.

  When the surface layer portion 43 is dried at a high temperature or drought in summer, the rainwater retained in the water-absorbing expansion body 4 or the temperature-sensitive water-absorbing resin 10 is gradually dissipated, and moisture is retained in the surface layer portion 43. Is continuously supplied. And the water | moisture content in this surface layer part 43 takes the heat | fever of a road surface, and evaporates, and it can suppress the raise of road surface temperature by this.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the water-permeable sheet bodies 3 and 3 are not limited to net-like ones, but may be any material that can allow intrusion of moisture having a large number of water-permeable holes. Further, the shape retaining body 5 is not limited to a plurality of wave-like members 11 .. arranged in parallel, and has at least a flattening strength that is not crushed by the load of the pavement, and forms an expansion absorption space S. If it is what you did. Furthermore, the material of the water-permeable sheet bodies 3 and 3 and the shape retaining body 5 can be variously selected in consideration of the fusibility and the like. Further, when the mat 1 is formed, the water-permeable sheet bodies 3 and 3, the shape retaining body 5, and the water absorbing / expanding body 4 are integrated by heat fusion. Other fixing means such as adhesion may be used. If an adhesive agent etc. are used, joining of the water-permeable sheet bodies 3 and 3 and the water absorption expansion body 4 is also possible. Further, in the pavement subjected to the drainage pavement, the surface layer portion 33 does not necessarily have a two-layer structure of the water permeable layer 35 and the crushed stone layer 36 for water storage. A mat 1... May be disposed inside or on the back side. Furthermore, when the mats 1... Are arranged on the pavement subjected to the water-permeable pavement, the mats are not necessarily laid on the back side of the surface layer portion 43 but may be embedded in the surface layer portion 43, for example.

It is a disassembled perspective view of the water retention mat for paving which concerns on one Embodiment of this invention. It is the perspective view similarly. It is a top view of a water-permeable sheet body. It is a longitudinal cross-sectional view of the water retention mat for pavements. It is a longitudinal cross-sectional view at the time of water absorption of the water retention mat for pavements. It is a perspective view of the water retention mat for pavements concerning other embodiments. It is a longitudinal cross-sectional view which shows the state which has arrange | positioned the water retention mat for pavements to the pavement which gave drainage pavement. Similarly, it is a longitudinal sectional view near the road shoulder. It is the same top view. It is a top view which shows the other laying example of the water retention mat for pavements. It is a longitudinal cross-sectional view which shows the state which has arrange | positioned the water retention mat for pavements to the pavement which gave water-permeable pavement. It is the same top view. It is a top view which shows the other laying example of the water retention mat for pavements.

Explanation of symbols

  1 .... Water retaining mat for pavement, 3 .... Water-permeable sheet body, 4 .... Water-absorbing expanded body, 5 .... Shape-holding body, 10 .... Temperature sensitive water-absorbing resin, 11 .... Wavy member, 15 .... Recessed part, 20. ..Water retention area, 21 ... Drain area, 30, 41 ... Road bed, 32 ... Impervious layer, 33, 43 ... Surface layer, 42 ... Roadbed, S ... Expansion absorption space

Claims (10)

A water retention mat (1) for pavement which is disposed inside or on the back side of the surface layer portions (33) and (43) having water permeability of the pavement, and which absorbs water and expands by absorbing water (4); And a shape-retaining body (5) that forms an expansion absorption space (S) into which the expansion portion of the water-absorbing expansion body (4) enters, and the shape-retaining body (5) is formed of a plurality of resin wave-like members (11). .. are arranged in parallel on the same plane with a gap between the concave portions (15) of the corrugated members (11), and the corrugated members (11). A water retention mat for pavements characterized by that . A water retention mat (1) for pavement which is disposed inside or on the back side of the surface layer portions (33) and (43) having water permeability of the pavement, and which absorbs water and expands by absorbing water (4); And a shape-retaining body (5) that forms an expansion absorption space (S) into which the expansion portion of the water-absorbing expansion body (4) enters, and the water-absorbing expansion body (4) and the shape-retaining body (5) are a pair of water permeable sheets. A water retention mat for pavement characterized by being sandwiched between bodies (3) and (3) . A water retention mat (1) for pavement which is disposed inside or on the back side of the surface layer portions (33) and (43) having water permeability of the pavement, and which absorbs water and expands by absorbing water (4); And the shape-retaining body (5) forming an expansion absorption space (S) into which the expansion portion of the water-absorbing expansion body (4) enters, and the water-absorbing expansion body so as to cover a part of the shape-retaining body (5). A water retention mat for pavement characterized in that a water retention area (20) and drainage areas (21) (21) are formed on the entire surface of the mat (1) by disposing (4) . The water retention region (20) is formed over the substantially entire surface of the mat (1) by disposing the water absorbing / expanding body (4) so as to cover substantially the entire surface of the shape retaining body (5). 2. A water retention mat for pavement according to 2 . The water retention mat for paving according to any one of claims 1 to 4, wherein the water-absorbing expanded body (4) is made of a nonwoven fabric mainly composed of a water-absorbing polymer . The water retention mat for pavements according to any one of claims 1 to 5, wherein the water-absorbing expanded body (4) is mixed with a temperature-sensitive water-absorbing resin (10) . The water retention mat for paving according to any one of claims 1 to 6, which has flexibility . A water-impermeable layer (32) is provided below the surface layer portion (33) having water permeability, and water that has permeated the surface layer portion (33) is guided along the upper surface of the water-impermeable layer (32) toward the road shoulder. In the pavement configured to be discharged without penetrating into the road bed (30), the pavement water retention mat (1) according to any one of claims 1 to 7 has the surface layer portion (33). A pavement characterized in that it is disposed inside or on the back side. The water retention mat (1) for pavement according to any one of claims 1 to 7 is disposed on the back side of the side portion along the road shoulder of the surface layer portion (33), and a part of the mat (1) is provided. The pavement according to claim 8, wherein the pavement is raised along a side surface of the surface layer portion (33) and disposed inside the surface layer portion (33) . A roadbed (42) and a roadbed (41) are provided below the surface layer portion (43) having water permeability so that water can penetrate from the surface layer portion (43) to the roadbed (42) and the roadbed (41). 8. A pavement comprising a pavement water retention mat (1) according to any one of claims 1 to 7 disposed inside or on the back side of the surface layer portion (43). .