JP4589700B2 - Construction method of water retentive pavement structure - Google Patents

Description

  The present invention relates to a water-retaining pavement structure, and more particularly to a water-retaining pavement structure that can suitably maintain a water retention function.

  The road surface temperature of asphalt pavement under the hot summer heat is easy to absorb sunlight because the color of the asphalt is black, and may rise to 60 ° C. or higher. Particularly in urban areas where the pavement ratio is high, the heat island phenomenon in which the entire urban area becomes high temperature is a problem due to such an increase in road surface temperature.

In view of this, various water retention pavements have been proposed that have a water retention function for retaining rainwater during rainfall, and suppress the increase in road surface temperature by evaporating the water retained in fine weather. For example, a water reservoir layer made of a crushed stone base material or a water-permeable asphalt mixture is provided below the perforated surface layer filled with a silt-based filler having a water retention property (water retention grout), and water is added to the moisture reservoir layer. The technique which arrange | positioned the piping for water supply to supply is disclosed (refer patent document 1).
Japanese Patent No. 3156151 (page 3-14, Fig. 1-3)

  However, the technique described in Patent Document 1 is liable to lower the water level of the water reservoir, making it difficult to suitably supply water from the water reservoir to the silt-based filler when the temperature rises during sunny weather or the like, and cannot maintain water retention. There was a problem.

  For example, when the road has a longitudinal gradient, water flows along the longitudinal gradient inside the moisture reservoir, the water level of the moisture reservoir decreases, and water flows from the moisture reservoir to the silt filler. It may become difficult to supply suitably.

This invention is made | formed in order to solve these problems, and makes it a subject to provide the construction method of the water-retaining pavement structure where a water retention function is suitably sustainable.

Construction method of water retention pavement structure according to the present invention, a water supply layer, wherein the water-retaining layer laminated above the water layer, e Bei and a water supply means for supplying water to the water supply layer, the water supply layer An open particle size mixture layer having continuous voids therein, a water supply material having water retention and water permeability filled in the continuous voids, and a water stop member installed so as to be able to retain water in the water supply layer. a construction method comprising Ru water retention pavement structure, and forming the open-graded composition layer having a continuous void therein, said continuous gap, and filling the water supply material, wherein the water supply material filling Forming a cut along the installation position of the water-stopping member in the opened particle size mixture layer, filling the cut with a water-stopping material to form the water-stopping member, and the water supply material And the water stop member is formed. Hirakitsubu degree mixture layer, i.e. comprising a step of forming the water retaining layer above the water layer.

  Such a water-retaining pavement structure includes a water stop member installed so that water can stay in the water supply layer, so that the water flow in the water supply layer is blocked by the water stop member and filled with the water supply material. It becomes difficult for the water level in a continuous space | gap to fall. Therefore, it becomes easy to supply water to a water retention layer, and it becomes possible to maintain a water retention function suitably.

  Moreover, since water can be stored in the water supply layer, the amount of water supplied from the water supply means can be saved, and the running cost can be reduced.

  Moreover, since the water supply material is also dammed by the water stop member, the outflow of the water supply material can be prevented. Therefore, it is not necessary to mix a binder such as cement with the water supply material in order to prevent outflow, so that the range of material selection can be expanded and the material cost can be reduced.

  Even if the water level of the water supply layer is lowered, the water supply material does not flow out and is in contact with the water retention layer, so that water is supplied to the water retention layer through the water supply material by capillary action. Therefore, it becomes easy to supply water to a water retention layer, and it becomes possible to maintain a water retention function suitably.

  Here, as long as the open particle size mixture layer has continuous voids therein, the type and aspect of the mixture are not particularly limited. For example, an open particle size asphalt mixture layer, an open particle size concrete mixture layer, an open particle size resin mixture layer, etc. Can be mentioned. When the open particle size mixture layer is an open particle size asphalt mixture layer, the mixing ratio, porosity, density, etc. of aggregate, asphalt binder, etc. may be any. Moreover, the open-graded asphalt mixture layer may be applied once or may be applied multiple times. Furthermore, in the case of an open-graded asphalt mixture layer applied multiple times, the type of the open-graded asphalt mixture may be different.

  The water supply material is not particularly limited as long as it is a material having water retention and water permeability. For example, silica sand, fine sand, fine crushed stone, glass beads, foamed mortar, or a mixture thereof may be used. it can. If these materials are used, water can be passed over a wide range of the water supply layer, and moisture can be absorbed and retained by capillary action. As a result of experiments by the inventors, when silica sand is used, it is preferable to use No. 3 to No. 6 silica sand, and more preferably No. 6 silica sand.

  Further, the water stop member may be any material as long as it has a low water permeability compared to the water supply material or a material that hardly has water permeability. For example, a resin-based material (such as a mastic resin), a grout agent, A water stop sheet or the like may be used. In the case of forming a water-stopping member using a resin-based material, for example, a cut is made in the open particle size mixture layer using an asphalt cutter or the like, and a liquid resin-based material is poured into the cut and cured. Good.

  Here, “water can stay in the water supply layer” means that the flow of water is blocked so that the water level in the water supply layer rises. For example, when the water retention pavement is applied to a road having a gradient in the longitudinal direction, a water stop member may be installed in the cross direction of the road (Claim 2). Further, depending on the slope of the road, the water stop member may be formed in a U shape, a V shape, a U shape, a W shape, or the like in plan view. At this time, it is natural that each character-shaped opening is directed upstream.

  In addition, the water retention layer is not particularly limited as long as it has water retention, and can be appropriately selected from known water retention pavements. For example, the water retention layer may be composed of an open particle size mixture layer having continuous voids therein and a water retention grout filled in the continuous voids. Further, for example, the water retention layer may be formed of a ceramic sintered body described in Japanese Patent No. 3168268.

  The water retention grout may be any one as long as it has water retention and can be filled in the continuous voids, and can be appropriately selected from known materials. Examples of the water retention grout include silt-based fillers described in Patent Document 1 and other known fillers.

  Here, it is preferable that the water retention pavement structure is subjected to a water stop treatment along the side portion of the water supply layer. For example, water can be prevented from flowing out from the joint of the curb stone by performing a water stop treatment with a water stop sheet between the curb stone, the water supply layer, and the water retention layer. As a result, the water level of the water supply layer is unlikely to decrease, and water is easily supplied to the water retention layer, so that the water retention function can be suitably maintained.

ADVANTAGE OF THE INVENTION According to this invention, the construction method of the water retention pavement structure which can sustain a water retention function suitably can be provided. Moreover, it becomes possible to permeate water to every corner of the pavement, and the road surface temperature can be effectively reduced.

  The best mode for carrying out the present invention will be described in detail with reference to the drawings. In the description, the same elements are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is a plan view of a road to which the water-retaining pavement structure according to the present embodiment is applied. FIG. 2 is a cross-sectional view of the road as viewed in the direction of arrows I-I shown in FIG. FIG. 3 is a longitudinal sectional view of the road as viewed in the direction of arrows II-II shown in FIG.

(Water retentive pavement structure)
As shown in FIGS. 1 to 3, the road 1 to which the water-retaining pavement structure according to the present embodiment is applied has a water supply layer 2, a water retention layer 3 stacked above the water supply layer 2, and the center of the road 1. It is interposed between the water supply pipe 4 which is the piped water supply means, the curb 5 installed along the side ends of the water supply layer 2 and the water retention layer 3, and the curb 5, the water supply layer 2 and the water retention layer 3. The water blocking sheet 6 and the water shielding layer 7 provided below the water supply layer 2 and the curb 5 are configured. The road 1 has a gradient in the longitudinal direction (hereinafter sometimes referred to as “road longitudinal gradient”), and also has a gradient in the transverse direction (hereinafter sometimes referred to as “transverse gradient”). (See FIGS. 2 and 3).

(Water supply layer 2)
As shown in FIGS. 2 and 3, the water supply layer 2 divides the water supply layer 2 into an open-graded asphalt mixture layer 21 having continuous voids therein, silica sand 22 as a water supply material filled in the continuous voids, and the water supply layer 2. And a water stop joint 23 which is a water stop member provided in the transverse direction of the road 1. The water supply layer 2 is laminated on the upper part of the water-impervious layer 7, and the outflow of water is prevented. Further, a water supply pipe 4 is embedded in the center of the water supply layer 2 (the center of the road 1) so that water can be received from the water supply pipe 4. Further, a water retention layer 3 is laminated above the water supply layer 2, and water can be supplied to the water retention layer 3 using the capillary phenomenon of the silica sand 22.

(Open grain size asphalt mixture layer 21)
The open-graded asphalt mixture layer 21 is formed to include a coarse aggregate, a fine aggregate, and stone powder (hereinafter, collectively referred to as “aggregate”) as a skeleton, and an asphalt binder that couples them. Has been. The composition of the aggregate, the composite particle size, and the added amount of the asphalt binder are any combination as long as the open particle size asphalt mixture layer 21 after compaction has continuous voids and has a flow resistance performance according to the construction site. However, it is preferable that the maximum particle size of the aggregate is about 13 mm and the porosity is about 15 to 35% (desirably about 20%).

(Silica sand 22)
The silica sand 22 plays a role as a water supply material, and is filled in the continuous voids of the open-graded asphalt mixture layer 21. The silica sand 22 filled in the continuous voids forms finer voids between the silica sands 22, absorbs water by capillary action, and retains water. Moreover, the silica sand 22 is provided with moderate water permeability by using the thing of a suitable particle size, and the water supplied from the water supply pipe 4 is permeate | transmitted by the whole water supply layer 2. As shown in FIG. The water permeability of the silica sand 22 is preferably adjusted appropriately according to the construction conditions. However, the higher the water permeability, the easier the water is supplied to a wide range of the water supply layer 2, but the water level in the water supply layer 2 is likely to be lowered. . As the silica sand 22, it is preferable to use so-called No. 6 silica sand having a center particle diameter of about 0.15 mm to 0.6 mm.
Here, silica sand 22 is used as a water supply material, but any material such as sand, fine crushed stone, glass beads, etc. may be used as long as it has a particle size that can sufficiently exhibit capillary action and can be filled into a continuous void. .

(Water stop joint 23)
The water-stop joint 23 plays a role of blocking the flow of water in the water supply layer 2 and raising the water level. In this embodiment, as shown in FIGS. It is constructed in a range substantially equal to the height dimension of the layer 2. The water stop joint 23 is constructed of a material that is difficult to pass water such as a resin material. Thereby, as shown in FIG. 3, the water in the water supply layer 2 is maintained at a certain water level even when it has a road longitudinal gradient. That is, by providing the water stop joint 23, it is possible to achieve both good water permeability and good water supply.

  In addition, although the space | interval of the water stop joint 23 installed in a road crossing direction can be changed suitably according to a road vertical gradient, for example, the thickness of the water supply layer 2 is about 3 cm, and a road vertical gradient (longitudinal gradient) is On the road of about 0.3% to 0.5%, it is preferable that the interval between the water stop joints 23 is about 5 m to 10 m. Further, the water stop joint 23 is preferably formed across the entire width direction of the road 1 as shown in the present embodiment, but may be partial as long as water can be stored.

(Water retention layer 3)
As shown in FIGS. 2 and 3, the water retention layer 3 is composed of an open-graded asphalt mixture layer 31 having continuous voids therein, and a water retention grout 32 filled in the continuous voids. The water retaining layer 3 has a function of depriving the surface of the road surface by evaporating heat from the surface, thereby depriving the road surface of heat by vaporization heat and lowering the road surface temperature. Moreover, the water retention layer 3 is laminated on the upper part of the water supply layer 2, and when the water content of the water retention layer 3 is reduced, the water retention grout 32 is supplied with water through the silica sand 22 of the water supply layer 2. .
In addition, since the structure of the open grain size asphalt mixture layer 31 is almost the same as the open grain size asphalt mixture layer 21 of the water supply layer 2, a detailed description thereof is omitted. In addition, as a result of experiments by the inventors, it is preferable that the thickness of the water retaining layer 3 be about 4 cm.

(Water retention grout 32)
The water retention grout 32 is a material having water permeability and water retention, and for example, “silt filler” described in Patent Document 1 can be used. That is, the water retention grout 32 is obtained by, for example, mixing a silt powder, a cement solidifying material, and an additive such as a water reducing agent or a setting retarder in a predetermined composition, and curing and drying. Has fine voids that can retain water.

  Here, the silt-based powder is a collection of rock powder. In addition, the cement-based solidifying material can be appropriately selected and used from super fast setting cement, ordinary Portland cement, ultra-high strength cement, early strength cement, blast furnace cement, and the like. Furthermore, as the additive, a water reducing material such as a carboxylic acid type or a melanin type, an SBR type, an acrylic type, a vinyl acetate type polymer emulsion, or the like can be used.

(Water supply pipe 4)
The water supply pipe 4 plays a role of supplying water to the water supply layer 2. In this embodiment, as shown in FIGS. 1 and 2, the bottom of the water supply layer 2 at the center of the road 1 is along the longitudinal direction. Installed. The water supply pipe 4 has fine through holes in the wall of the pipe, and water can be supplied to the water supply layer 2 from the through holes. The water supply pipe 4 is connected to a water supply facility (not shown) including, for example, a water storage tank and a water pump. As the water supply pipe 4, for example, a perforated PVC pipe, a porous pipe, a vinyl hose, or the like can be appropriately selected and used. Further, a spiral drain pipe or the like may be used to protect the water supply pipe 4.

  In the present embodiment, the pavement above the water supply pipe 4 has a pavement structure composed of an open-graded asphalt mixture and silica sand as shown in FIG. 2, and the water level is higher than the bottom surface of the water retention layer 3. Can be done.

  Here, the water supply facility (not shown) measures, for example, the outside air temperature or the road surface temperature by a sensor (not shown), controls the water supply pump based on the measurement data, rainwater stored in the water storage tank, groundwater, It is preferable to feed middle water, industrial water, etc. to the water supply pipe 4. Thereby, the water to be used can be saved.

(Curbstone 5)
The curb 5 protects the side edge of the road 1 and is configured by laying L-shaped blocks made of concrete. The rain that has fallen on the surface of the road 1 gathers on the curb 5 along the drainage gradient (hereinafter simply referred to as “drainage gradient”) determined by the combination of the road longitudinal gradient and the crossing gradient, and flows over the curb 5 Drained.
In the present embodiment, the curbstone 5 is arranged on the side portion of the road 1, but the present invention is not limited to this, and a side groove such as a U-shaped groove may be arranged.

(Water-stop sheet 6)
The water stop sheet 6 plays a role of preventing water from leaking from the joint between the curbs 5 and the boundary between the curb 5 and the water shielding layer 7, and as shown in FIG. 2, the water supply layer 2 and the water retention layer It is interposed between the side edge of the layer 3 and the curbstone 5. The water-stop sheet 6 is folded along the upper surface of the water-impervious layer 7, and water hardly enters the boundary between the curbstone 5 and the water-impervious layer 7.
In addition, in this embodiment, although the water stop sheet 6 was folded along the upper surface of the water shielding layer 7, it may not necessarily be folded depending on the degree of water leakage.

(Water shielding layer 7)
The water shielding layer 7 plays a role of preventing the outflow of water from the bottom surface of the water supply layer 2, and is provided in a layered form below the water supply layer 2. The water-impervious layer 7 is composed of a dense particle size asphalt mixture or the like, and has a smaller water permeability coefficient than the water supply layer 2.

(Water movement in water-retaining pavement)
It continues and demonstrates the movement of the water in a water retention pavement with reference to FIG. 2, FIG.
When water is supplied to the water supply pipe 4 from a water supply facility (not shown), the water is absorbed into the silica sand 22 of the water supply layer 2 through a through-hole formed in the wall of the water supply pipe 4, and the water supply layer 2 is permeated through the entire area (see arrow A _{1 in} FIG. 2). At this time, the water supplied from the water supply pipe 4 flows along the drainage gradient of the road 1 in the water supply layer 2. And the water which flowed in the longitudinal direction is blocked by the water stop joint 23, and the water level of the water supply layer 2 will rise (refer FIG. 3).

  As a result, the water level in the water supply layer 2 is stepped corresponding to the interval between the water stop joints 23 in the longitudinal direction. That is, since the water stop joints 23 are arranged at predetermined intervals in the longitudinal direction, the water flowing into the water supply layer 2 is difficult to flow downward, and water tends to stay in the water supply layer 2 between the adjacent water stop joints 23, 23. .

And the water which permeate | transmitted the whole area of the water supply layer 2 water-retains beyond the boundary surface of the water supply layer 2 and the water retention layer 3 by a capillary phenomenon, when water is not sufficiently retained in the water retention grout 32 of the water retention layer 3. is water in the sexual grout 32 is water retention over the entire water retention layer 3 (see arrow a ₂ in FIG. 2, FIG. 3). At this time, the water level of the water supply layer 2 is maintained near the bottom surface of the water retention layer 3 by the water stop joint 23, so that water is easily supplied to the water retention layer 3.
Moreover, since the outflow of the silica sand 22 is prevented by the water stop joint 23, even when the bottom surface of the water retaining layer 3 and the water surface of the water supply layer 2 are separated, the capillary of the silica sand 22 interposed in the continuous gap therebetween. Depending on the phenomenon, water is appropriately supplied to the water retention layer 3.

When the outside air temperature rises due to clear weather or the like and the surface of the road 1 becomes hot, the water retained in the water retention layer 3 evaporates as water vapor (see arrow A3 in FIGS. 2 and ₃ ). At this time, since the vaporization latent heat of water is taken away from the water retention layer 3 and the outside air, an increase in the road surface temperature of the road 1 is suppressed.

(Construction method of water retentive pavement structure)
It continues and demonstrates the construction method of a water retention pavement structure with reference to FIG. FIG. 4 is a cross-sectional view showing the construction method of the water-retaining pavement structure in stages.

(First open grain size asphalt mixture layer construction process)
As shown in FIG. 4 (a), an asphalt finisher or the like is used to lay an open-graded asphalt mixture of a predetermined composition on the upper part of the water shielding layer 7, and a road roller, vibration roller, tire roller, vibration plate, tamper Etc. (hereinafter collectively referred to as “compacting machine”) to form an open-graded asphalt mixture layer 21 having a predetermined density, a predetermined thickness, and a predetermined porosity.
Prior to leveling of the open-graded asphalt mixture, square bars and formwork for forming a groove for laying the water supply pipe 4 are installed along the center of the road, and after leveling, the water pipe is inserted into the groove. It is preferable to lay 4 and backfill the surroundings because the water supply pipe 4 is not damaged. In addition, prior to leveling the open-graded asphalt mixture, a water-stop sheet 6 is disposed along the curb 5 (see FIG. 2).

(Water supply material filling process)
Next, as shown in FIG. 4 (b), silica sand 22 as a water supply material is sprayed from the surface of the open-graded asphalt mixture layer 21 by an appropriate means, and spread with a rake G. Thereafter, vibration is applied to the open-graded asphalt mixture layer 21 by vibration applying means such as a vibrating plate H and a vibrating roller (not shown), and the silica sand 22 is filled in the continuous voids of the open-graded asphalt mixture layer 21.

(Water stop joint construction process)
Then, using a cutting machine such as asphalt cutter J as shown in FIG. 4 (c), a cut 23a (cutter groove) is provided in the open grain size asphalt mixture layer 21, and as shown in FIG. The device K is used to inject a resinous material having water-stopping properties into the cut 23a. The waterproof joint 23 is constructed by the resin material being cured.

(Asphalt emulsion spraying process)
Next, as shown in FIG. 4E, an asphalt emulsion is sprayed on the upper surface of the open-graded asphalt mixture layer 21 using a sprayer L, a distributor (not shown) or the like. The amount of asphalt emulsion can be appropriately changed according to the construction conditions, but is preferably about 0.2 to 0.4 liter / m ² , more preferably about 0.3 liter / m ² . If it is about this level, the familiarity between the open-graded asphalt mixture layer 21 of the water supply layer 2 and the open-graded asphalt mixture layer 31 of the water retention layer 3 is prevented without hindering the movement of water at the boundary between the water supply layer 2 and the water retention layer 3. Can do well.
Further, at this time, the sealing sand may be sprayed on the surface of the open-graded asphalt mixture layer 21 so that the water retention grout 32 does not soak into the water supply layer 2 in the water retention grout filling step described later.

(Second open grain size asphalt mixture layer construction process)
Then, as shown in FIG. 4 (f), on the water supply layer 2, using an asphalt finisher or the like, spread the open-graded asphalt mixture again, and compact it with a compacting machine, with a predetermined density, a predetermined thickness, An open particle size asphalt mixture layer 31 having a predetermined porosity is constructed.

(Water retention grout filling process)
Next, as shown in FIG. 4G, a liquid water retaining grout 32 having fluidity is injected into the continuous gap from the surface of the open-graded asphalt mixture layer 31 using the injection hopper M. The injection hopper M can discharge the water retention grout 32 from the lower discharge port while keeping the head of the water retention grout 32 in the hopper constant by receiving the supply of the liquid water retention grout 32 from the grout tank. ing. By using such an injection hopper M, the injection speed of the water retention grout 32 becomes constant with a simple configuration, and the water retention grout 32 can be injected well. Further, when the water retention grout 32 is injected, the water retention grout 32 can be injected without gaps in the continuous voids by applying vibration to the open-graded asphalt mixture layer 31 using vibration applying means such as a vibration roller. It is.

  After the injection of the water retention grout 32, the water retention grout 32 is solidified by curing for a predetermined time. Thereby, the road 1 which has a water retention pavement structure is constructed | assembled (refer FIG.4 (h)).

  The best mode for carrying out the present invention has been described in detail with reference to the drawings. However, the present invention is not limited to the embodiment, and is appropriately designed without departing from the spirit of the present invention. It can be changed.

  For example, in this embodiment, the water stop member (water stop joint 23) is constructed so as to block the crossing direction of the road 1, but any shape can be used as long as water can be retained in the water supply layer 2. Members may be constructed or arranged in any way.

Moreover, in this embodiment, although the water supply layer 2 and the water retention layer 3 were constructed in two steps, the construction method is not limited to this. For example, after the open-graded asphalt mixture layers 21 and 31 are constructed, the road 1 Alternatively, the silica sand 22 may be injected from the surface, and then the water retention grout 32 may be injected.
In such a case, the water-stopping joint 23 may be constructed by incising the water supply layer 2 and the water retention layer 3 with the asphalt cutter J after injecting the water retention grout 32 and injecting a resin material.

  Moreover, in this embodiment, although the water stop joint 23 was constructed | assembled by inject | pouring resin-type material, it is not restricted to this, You may make it insert a plate-shaped water stop material in the cut | interruption 23a.

  In this embodiment, the water retention layer 3 is composed of the open grain size asphalt mixture layer 31 and the water retention grout 32. However, the present invention is not limited to this. For example, the ceramic sintered body described in Japanese Patent No. 3168268 The water retention layer may be constructed using

  Moreover, in this embodiment, although the water retention layer 3 was formed in contact with the upper surface of the water supply layer 2, it is not restricted to this, If water can be supplied from the water supply layer 2 to the water retention layer 3, the water supply layer 2 Some layers may be interposed between the water retention layer 3 and the water retention layer 3.

  Moreover, in this embodiment, although the water supply means was constructed by laying the water supply pipe 4 on the bottom surface of the water supply layer 2, the present invention is not limited to this. May be provided.

  In this embodiment, the water supply pipe 4 is arranged in the center of the road. However, the present invention is not limited to this, and it is a matter of course that a water supply pipe may be installed on the upstream side of the slope on a single slope road. is there. In addition, if there is no fear of damaging the water supply pipe 4, the water supply pipe 4 may be laid before spreading the open-graded asphalt mixture.

  In the present embodiment, the pavement configuration above the water supply pipe 4 is the same as that of the water supply layer 2, but is not limited thereto, and may be the same configuration as the water retention layer 3, for example.

It is a top view of the road to which the water retention pavement structure concerning this embodiment is applied. It is a cross-sectional view of the road in the II arrow shown in FIG. It is a longitudinal cross-sectional view of the road in the II-II arrow shown in FIG. It is sectional drawing which showed the construction method of the water retention pavement structure in steps.

Explanation of symbols

1 Road 2 Water supply layer 21 Open-graded asphalt mixture layer 22 Silica sand (water supply material)
23 Water stop joint (water stop member)
3 Water retention layer 31 Open grain size asphalt mixture layer 32 Water retention grout 4 Water supply pipe (water supply means)
5 Curbstone 6 Water-stop sheet 7 Impermeable layer

Claims (2)

A water supply layer, and a water-retaining layer stacked above the water layer, the water supply means for supplying to the water layer of water, Bei example, said water layer, and Hirakitsubu degree mixture layer having continuous voids inside, wherein the water supply material having a filled water retention and permeability to continuous void, the water-shutoff member with water is installed to be retained in the water supply layer, a construction method of water retention pavement structure Ru provided with,
Forming the open particle size mixture layer having the continuous voids therein;
Filling the continuous air gap with the water supply material;
Forming a cut along the installation position of the water blocking member in the open particle size mixture layer filled with the water supply material;
Filling the cut material with a water-stopping material to form the water-stopping member;
An open particle size mixture layer filled with the water supply material and formed with the water-stopping member, that is, forming the water retention layer above the water supply layer. Method.   Before the step of forming the water retaining layer, further comprising the step of spraying asphalt emulsion on the water supply layer and sprinkling filler sand.
  The step of forming the water retention layer includes
  Forming an open particle size mixture layer having continuous voids on the upper surface of the water supply layer sprayed with the asphalt emulsion and the filler sand;
  The method for constructing a water retentive pavement structure according to claim 1, comprising filling the continuous voids with a water retentive grout.

Images