JP4469303B2 - Pavement construction method - Google Patents

Description

The present invention also relates to the construction how the pavement.

  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, it is “a perforated surface layer of a pavement having a function of suppressing an increase in road surface temperature filled with a silt-based filler” by the applicant of the present application (see Patent Document 1).

On the other hand, in recent years, the demand for paving bodies is increasing, and the development of paving bodies having various functions and the construction methods thereof are desired. For example, as for the above-described pavement having water retention (hereinafter referred to as water retention pavement), development of a pavement having a noise reduction function and a drainage function in addition to a water retention function is being promoted. Specifically, (1) Constructing a water-retaining pavement having a void on the surface side by adjusting the injection amount of the water-retaining grout for the open-graded asphalt mixture layer that is the base of the water retentive pavement And (2) a construction method for constructing a so-called drainage pavement (noise reduction pavement) on a newly established or existing water-retaining pavement.
Japanese Patent No. 3156151 (page 3 to page 14, FIGS. 1 to 3)

However, in the construction method according to the above (1), the distribution of voids formed on the surface side of the water-retaining pavement after construction is constant because the distribution of voids in the open-graded asphalt mixture layer as a base is not constant. There was a problem that it was difficult.
Moreover, in the construction method which concerns on above-mentioned (2), in order to build a water-retaining pavement body and a drainage pavement body, the construction took time.

The present invention aims to provide a construction how the pavement more highly functional pavement having a function can be easily constructed such noise reduction function and the water retention capability.

As a means for solving the above-mentioned problem, the invention according to claim 1 is characterized in that continuous voids are formed by sucking the injected grout to form a layer having continuous voids having a depth of 2 cm to 3 cm on the surface side. A pavement construction method comprising: a second step of forming a pavement upper part having a noise reduction function, a temporary storage function and a drainage function on a pavement lower part filled with grout .

  Here, the type of grout to be injected into the open particle size mixture layer is not particularly limited in the present invention. In addition to the water retention grout described in the embodiments described later, so-called cement used when constructing a semi-flexible pavement. Including milk.

According to such a pavement construction method, even if the distribution of voids formed in the open particle size mixture layer varies, the grout is injected to the surface side of the open particle size mixture layer (first step), and then injected. It is possible to construct a pavement in which a desired gap is formed on the surface side of the grout that has been sucked.
Therefore, for example, when the grout is a water retention grout, a highly functional water retention pavement having a noise reduction function and a drainage function can be constructed by forming voids on the surface in addition to the water retention function. .
Moreover, according to the construction method of such a pavement, since the grout is only sucked after injecting the grout (first step), the construction for constructing the drainage pavement on the water-retaining pavement. Compared with the method, it does not take time and can shorten the construction time.

  The invention according to claim 2 is the pavement construction method according to claim 1, wherein the grout is a water retention grout that becomes a water retention material having water retention after curing.

  Here, the water retention grout is a grout that becomes a water retention material having water retention by self-curing after construction. As an aspect in which the hardened water retaining material has water retaining capacity, for example, there is an aspect in which fine voids are formed inside the water retaining material, and the water retaining function is configured by the fine voids.

  According to the construction method of such a (water retention) pavement, after injecting water retention grout into the voids of the open particle size mixture layer to the surface side (first step), the water retention grout injected into the voids By suctioning and forming a void on the surface side (second step), it is possible to construct a water-retaining pavement in which voids are favorably formed on the surface side.

  That is, for example, when adjusting the amount of water retaining grout injected into the voids of the open particle size mixture layer to form voids on the surface side of the open particle size mixture layer, the open particle size mixture layer is constructed based on a predetermined design. However, since the voids of the open particle size mixture layer vary and are not distributed uniformly, the voids formed after injection are not constant. As a result, the water retaining grout is injected up to the upper part in the places where there are few voids, while the voids after injection may increase in the places where there are many gaps.

  However, according to the construction method of the water-retaining pavement according to the present invention, once (temporarily) the water-retaining grout is injected almost 100% up to the surface side of the open particle size mixture layer, and then injected. By sucking a desired amount of water retaining grout from the grout, a water retaining pavement having a desired void formed on the surface side can be obtained. Therefore, in the water-retaining pavement, the voids on the surface side are distributed substantially uniformly in the horizontal plane direction. Therefore, a water-retaining pavement with a uniform gap formed on the surface side has not only the original water retention function, but also a noise reduction function and a temporary storage function. It has a drainage function.

In particular, when constructing a water-retaining pavement having a gap on the surface side at a site (site) having a longitudinal gradient, applying such a water-retaining pavement construction method can rake the injected water-retaining grout, etc. After soaking, a desired void can be formed on the surface side by sucking the water retaining grout.
That is, in a site having a longitudinal gradient, if water retention grout is injected into the voids of the open particle size mixture layer, the water retention grout flows according to the longitudinal gradient due to its own fluidity, and the distribution of voids tends to vary. Thus, by temporarily injecting the water retention grout and then sucking it, the distribution of the voids can be prevented from varying.

  And, in this way, the water-retaining pavement in which voids are formed on the surface side thereof has not only the function of lowering the road surface temperature by the water retention function originally possessed by the water-retaining pavement, but also formed on the surface side. By the air gap, it is equipped with noise reduction function, temporary storage function, drainage function, etc., and is highly functional. Therefore, the construction application location of the water-retaining pavement having such a high function is expanded.

Further, in the second step relating to the construction method of the pavement, in the grout suction device for sucking the injected grout, an adsorption nozzle for adsorbing to the surface of the open particle size mixture layer into which the grout has been injected, connected to the suction nozzle, use a suction negative pressure generating means for generating a suction negative pressure for sucking the grout, a separating means for separating the air and grout aspirated, the grout suction device provided with Is preferred.

  According to such a grout suction device, a suction negative pressure is generated by a suction negative pressure generating means in a state where the suction nozzle is in contact with the surface of the open particle size mixture layer into which the grout has been injected. It can adsorb and suck the grout. The sucked air and grout can be separated by the separating means. Thereby, the separated grout can also be reused.

Also, grout suction device, a stirring means for stirring the grout separated by the separation means, preferably Ru with further.

  According to such a grout suction device, the separated grout can be stirred by the stirring means. This can prevent grout material separation (segregation of aggregate, cement, etc.).

According to the present invention, it is possible to provide a construction how the pavement more highly functional pavement having a function can be easily constructed such noise reduction function and the water retention capability.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 8 as appropriate.
In the drawings to be referred to, FIG. 1 is a cross-sectional view illustrating a construction method for a water-retaining pavement according to the present embodiment, and shows a state before injection of a water-retaining grout. FIG. 2 is a side view of a water retention grout spraying device for spraying water retention grout. FIG. 3 is a cross-sectional view for explaining the construction method of the water retentive pavement according to the present embodiment, and shows the state of spraying and injecting the water retentive grout. FIG. 4 is a side view of a water retention grout suction device that sucks water retention grout. FIG. 5 is a plan view of a water retention grout suction device that sucks water retention grout. FIG. 6 is a view from the back side of the suction nozzle. FIG. 7 is a cross-sectional view for explaining the construction method of the water-retaining pavement according to the present embodiment, and shows the suction state of the water-retaining grout. FIG. 8 is a cross-sectional view of the water-retaining pavement constructed by the construction method of the water-retaining pavement according to the present embodiment.
4 and 5, the suction negative pressure generating unit 70 is schematically drawn for easy understanding. Further, in FIGS. 3 and 7, the water retention grout spraying device 40 and the like are shown small in order to make it easy to understand the injection state and suction state of the water retention grout.

≪Construction method of water retentive pavement≫
As shown in FIGS. 1 to 8, the construction method of the water-retaining pavement 30 according to the present embodiment is substantially 100% up to the surface side of the continuous void 10 a of the open-graded asphalt mixture layer 10 (open-graded mixture layer). A first step (see FIG. 3) for injecting the water retention grout 21 and a second step (see FIG. 7) for sucking the injected water retention grout 21 and forming a continuous void 31a on the surface side. It is out. Hereinafter, while explaining each process, the construction apparatus used in each process will be described as appropriate. In addition, the application location of the construction method of the water retentive pavement 30 may be other locations regardless of the roadway or the sidewalk.

<First step>
The first step of injecting the water retention grout 21 will be described together with the open particle size asphalt mixture layer 10 to be injected, the water retention grout 21 to be injected, the water retention grout spraying device 40 for spraying the water retention grout 21, and the like.

[Open grain size asphalt mixture layer]
First, the open particle size asphalt mixture layer 10 will be described with reference to FIG.
As shown in FIG. 1, the open-graded asphalt mixture layer 10 is constructed on an impermeable layer S (water shielding layer).
The impermeable layer S is not particularly limited in the present invention. For example, a dense particle size (13) asphalt mixture layer obtained by compacting a dense particle size (13) asphalt mixture or a SMA (stone mastic asphalt) mixture may be used. Examples thereof include a compacted SMA mixture layer and a base layer formed by compacting a base layer mixture proposed by the Japan Highway Public Corporation.

  The open-graded asphalt mixture layer 10 is a layer formed by compacting an open-graded asphalt mixture on such an impermeable layer S. The open particle size asphalt mixture layer 10 has a predetermined porosity (for example, 15 to 35%) and a predetermined construction thickness (for example, 10 cm), and has a continuous void 10a therein. More specifically, the open-graded asphalt mixture layer 10 includes a coarse aggregate 11 (such as No. 6 crushed stone) serving as a skeleton and an asphalt mortar 12. In addition, the open grain size asphalt mixture layer 10 may be newly provided or may be already provided.

  Asphalt mortar 12 is a fine aggregate (natural sand such as coarse sand and fine sand, artificial sand such as screenings and crushed sand), filler (stone powder), and asphalt binder hardened after construction. The asphalt mortar 12 covers the surface of the coarse aggregate 11 and bonds the coarse aggregates 11 together so that the coarse aggregate 11 is engaged.

(Open grain size asphalt mixture)
Here, the open particle size asphalt mixture before compaction will be described. The open particle size asphalt mixture is composed of coarse aggregate 11, fine aggregate and stone powder (hereinafter referred to as “aggregate”) and asphalt for combining them. It is made of asphalt mortar 12 containing a binder. Aggregate composition and composite particle size of asphalt mixture, and the amount of asphalt binder added, as long as the open particle size asphalt mixture layer 10 after compaction has the stability corresponding to the continuous gap 10a and the construction location, etc. Such a blend may be used.

For example, when the maximum particle size of the aggregate to be used is 13 mm (that is, the aggregate having the maximum particle size to be used is No. 6 crushed stone), the aggregate particle size of the aggregate of the open particle size asphalt mixture is within the particle size range shown in Table 1. If it exists, the set porosity of the open particle size asphalt mixture layer 10 will be 15 to 35%. Such an open particle size asphalt mixture layer 10 is preferable because the water retaining grout 21 can be sufficiently injected and filled in the continuous void 10a.
In addition, the maximum particle size of the aggregate to be used may be 5 mm, 20 mm, or the like. However, as a result of extensive research, the inventors of the present application have determined that the maximum particle size of the aggregate constituting the open-graded asphalt mixture layer 10 is as follows. Has found that it is particularly desirable to be 13 mm.

  The asphalt binder which is blended in the open particle size asphalt mixture and constitutes the asphalt mortar 12 is added with an anti-peeling agent such as amine in consideration of the open particle size asphalt mixture layer 10 having a peeling resistance to water after construction. It is preferable that the modified asphalt binder. Moreover, when considering water resistance, modified asphalt type 1 and modified asphalt type 2 can also be used.

[Water retention grout]
Next, the water retention grout 21 (see FIG. 3) to be injected into the continuous void 10a of the open particle size asphalt mixture layer 10 will be described.
The water retention grout 21 is a grout that becomes a water retention material 22 (see FIG. 8) having water retention by self-curing after construction. The water retention material 22 after curing has fine voids inside, and the water retention function is carried by the fine voids. Such a water retaining grout 21 is mixed and produced with a predetermined composition by a grout mixer or the like, and then temporarily stored in a grout tank or the like. However, the water retaining grout 21 may be stored in a predetermined composition without being stored, then discharged from the grout mixer and sprayed.

  More specifically, as such a water retention grout 21, for example, the “silt filler” described in Japanese Patent No. 3156151 (Patent Document 1) by the applicant of the present application can be used. The silt-based filler is a mixture of silt-based powder, cement-based solidifying material, water, and water reducing agent or setting retarder as an additive in a predetermined composition.

  As the silt powder, for example, a dust collected from rocks can be used. As the cement-based solidifying material, it 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 in consideration of construction conditions. As the water reducing agent for the additive, for example, a water reducing agent such as a carboxylic acid type or a melanin type can be used, and as the setting retarder for the additive, for example, an SBR type, acrylic type, or vinyl acetate type polymer emulsion can be used. .

  And the mixing | blending of the water retention grout 21 is 20%-60% by mass percentage of silt-type powder with a content of 50% or more of the silt content of a particle size of 5 micrometers-75 micrometers in mass percentage, and cement-type solidification material by mass percentage. 5% to 50%, water is preferably 25% to 50% by mass, and water reducing agent or setting retarder is preferably 0.1% to 5% by mass. If it is a water retention grout of such a composition, the above-mentioned fine voids (not shown) are suitably formed in the water retention material 22 after curing. As a result, the water retention material 22 has good water retention.

[Water retention grout application device]
Next, with reference to FIG. 2, the water retaining grout spraying device 40 that sprays the water retaining grout 21 will be described. The water retention grout spraying device 40 mainly includes a carriage 41 having a tire 41a at a lower portion, and a grout container 43 that is fixed on the carriage 41 and temporarily accommodates the water retention grout 21. A handle 42 is fixed to the carriage 41, and the water retaining grout spraying device 40 is operated by the handle 42 so that it can be moved as desired.

  The grout container 43 is a container that temporarily stores the water retention grout 21 while stirring. The grout container 43 is provided with an openable / closable grout charging lid 44. By opening the grout charging cover 44 (see arrow A1), the water retaining grout 21 can be charged into the grout container 43. (See arrow A2). On the other hand, after the water retaining grout 21 is charged, the grout charging lid 44 is closed to block the inside of the grout container 43 from the outside, and the hardening of the water retaining grout 21 thus charged is delayed. .

  A stirring blade 45 is provided in the grout container 43. The stirring blade 45 is rotated by a motor 46 fixed to the grout container 43 (see arrow A3). Therefore, by rotating the stirring blade 45, the water retention grout 21 in the grout container 43 is stirred, and the quality is ensured.

  A cock 47 is provided below the side wall of the grout container 43. A flexible grout spray hose 48 is connected to the mouth of the cock 47. Therefore, when the cock 47 is opened, the water retention grout 21 in the grout container 43 flows through the grout spraying hose 48 via the cock 47. Then, the water retaining grout 21 can be sprayed in a desired manner by grasping the tip (downstream end) of the grout spray hose 48 and directing it in a desired direction (see arrow A4, FIG. 3).

[Sprinkling / injection of water retention grout]
Next, referring to FIG. 3 in addition to FIG. 2, the water retention grout 21 is sprayed on the surface of the open-graded asphalt mixture layer 10 using the water retention grout spraying device 40 and the like, and the water retention in the continuous gap 10a. The situation where the grout 21 is injected will be described.

  The grout charging lid 44 of the water retention grout spraying device 40 is opened, an appropriate amount of water retention grout 21 is charged into the grout container 43 from a grout mixer and grout tank (not shown), and the stirring blade 45 is rotated to be charged. The water retention grout 21 thus prepared is stirred. Next, the handle 42 is operated, the water retention grout spraying device 40 is moved to a desired spraying position, and the water retention grout 21 is transported.

Thereafter, at the spraying position, the cock 47 is opened, the tip of the grout spraying hose 48 is gripped, and the water retention grout 21 is sprayed on the surface of the open-graded asphalt mixture layer 10 (see FIG. 2, FIG. 3, arrow A4). ).
Thus, by using the water retention grout spraying device 40, it is not necessary to move the grout mixer, the grout tank, and (not shown), and the construction can be easily performed. In addition, by transferring all of the water retention grout produced by the grout mixer to the water retention grout spraying device 40, it is possible to immediately start production of a new water retention grout and improve workability (such as shortening the construction time). ).

  Then, as shown in FIG. 3, the sprayed water retaining grout 21 is leveled with a rubber rake 81 or the like. Next, the open particle size asphalt mixture layer 10 is vibrated by a vibrating roller 82, a vibrating plate (not shown), or the like, and the water retaining grout 21 is injected into all of the continuous gaps 10a.

  Here, the water retention grout 21 is injected to the surface side of the open-graded asphalt mixture layer 10. That is, the water retention grout 21 is injected into the continuous void 10a at approximately 100%. That is, for example, when the spraying amount of the water retention grout 21 is insufficient, the water retention grout 21 is again sprayed and injected into the insufficient portion.

<Second step>
Next, a process of sucking a predetermined amount of water retaining grout 21 from the water retaining grout 21 injected into the continuous void 10a of the open particle size asphalt mixture layer 10 will be described.

[Water retention grout suction device]
First, the water retention grout suction device 50 that sucks the water retention grout 21 will be described with reference to FIGS. 4, 5, and 6. As shown in FIGS. 4 and 5, the water retention grout suction device 50 includes a cart 51 having a tire 51 a in the lower portion, a stirring vessel 52 mounted on the cart 51, and a hose 61 having flexibility in the stirring vessel 52. A suction nozzle 60 connected via the filter, a filter 65 (separating means) built in the stirring container 52, and a suction negative pressure generating unit 70 (suction negative pressure generating means) for making the inside of the stirring container 52 negative. , Mainly. The suction negative pressure generating unit 70 is connected to the suction nozzle 60 via the filter 65 and the stirring container 52.

(Cart)
The carriage 51 has tires 51a and 51a in the lower part thereof, and can run.

(Stirring container)
The stirring container 52 is a sealed container for stirring the sucked and separated water retaining grout 21 having an outer shape that is a cylindrical body.
A stirring blade 53 (stirring means) is provided in the stirring container 52, and the stirring blade 53 is rotated by a motor 54 (stirring means) fixed to the carriage 51 (see arrow A5). As a result, the water retaining grout 21 that has fallen into the stirring container 52 is stirred, and material separation of the water retaining grout 21 is prevented.
A cock 55 is provided below the side wall of the stirring vessel 52. When the cock 55 is opened, the water retention grout 21 in the stirring vessel 52 is discharged to the outside, and the discharged water retention grout 21 can be reused.
In addition, a handle 56 is fixed to the stirring container 52, and by holding the handle 56, the water retention grout suction device 50 can be operated and moved as desired.

  In addition, the stirring vessel 52 has a negative pressure chamber 52a that has a negative pressure therein. As described above, since the stirring container 52 has the negative pressure chamber 52a, the suction negative pressure can be suitably controlled. Therefore, it becomes easy to suck a predetermined amount of water retaining grout 21, and the continuous void 31a can be suitably formed.

(Suction nozzle)
The suction nozzle 60 is a nozzle that comes into contact with the surface of the open-graded asphalt mixture layer 10 filled and filled with the water retention grout 21. As shown in FIGS. 5 and 6, the suction nozzle 60 includes a suction nozzle body 62 and a pair of weights 63 and 63.

  As shown in FIG. 6, the suction nozzle body 62 is an elongated body having a slit-like suction port 62a on the back surface side (contact side). If the width W1 of the suction port 62a is too wide, the area of the suction port 62a becomes large, and the suction negative pressure acting on the injected water retention grout 21 is reduced. Therefore, the width W1 is preferably about 350 mm, for example.

  The pair of weights 63 and 63 are fixed symmetrically on the upper surface of the suction nozzle body 62. Thereby, the adhesiveness of the adsorption nozzle main body 62 and the open particle size asphalt mixture layer 10 in which the water retaining grout 21 is injected is enhanced, and the water retaining grout 21 can be sucked efficiently.

(filter)
The filter 65 is a separating unit that separates the sucked water retention grout 21 and air. Therefore, as the filter 65, an open mesh or a non-woven fabric through which air passes but the water retention grout 21 does not pass can be used.
The filter 65 has a bottomed cylindrical body having a hollow portion 65 a, and is fixed to the top wall of the stirring vessel 52 via a lattice-like filter basket (not shown) serving as a support for the filter 65. . As will be described later, when the suction negative pressure is generated by the suction negative pressure generating unit 70, the hollow portion 65a becomes negative pressure, and then the negative pressure chamber 52a of the stirring vessel 52 becomes negative pressure.

(Suction negative pressure generating unit)
The suction negative pressure generating unit 70 (suction negative pressure generating means) is a unit for generating a suction negative pressure for sucking the water retention grout 21, and by making the hollow portion 65a of the filter 65 a negative pressure. This is a unit for setting the negative pressure chamber 52a of the stirring vessel 52 to a negative pressure. The suction negative pressure generating unit 70 mainly includes ejectors 71 and 71, ball valves 72, 72, and 73, and a compressor 74 (compressed air supply device).

The compressor 74 is a device for compressing outside air and supplying the compressed air. The compressor 74 is connected to the upstream side of the ball valves 72, 72 via a bifurcated pipe 74 a. The ball valves 72 and 72 are connected to the compressed air inflow side (upstream side) of the ejectors 71 and 71 via pipes 72a and 72a, respectively. The suction side of each ejector 71 is connected to the hollow portion 65a of the filter 65 through a pipe 71a.
A midway position of the pipe 74a (between the compressor 74 and the branch point) is connected to the hollow portion 65a of the filter 65 through the pipe 73a. Next, the ball valve 73 is provided at an intermediate position of the pipe 73a. Further, the suction negative pressure acting on the negative pressure chamber 52a can be controlled by changing the number of ball valves 72 to be opened.

  Therefore, when the compressor 74 is operated with the ball valves 72 and 72 open and the ball valve 73 closed, the outside air is compressed into compressed air and supplied to the ejectors 71 and 71. . Thereby, the air in the hollow portion 65a of the filter 65 is sucked to the suction side of each ejector 71 through the pipe 71a, and the hollow portion 65a becomes negative pressure. As a result, the air enters the negative pressure chamber 52a of the stirring vessel 52. Suction negative pressure is applied.

  On the other hand, when the ball valves 72 and 72 are closed and the ball valve 73 is opened while the compressor 74 is operated, the compressed air is supplied to the filter 65 via the pipe 73a. Thereby, the water retaining grout 21 sucked and remaining on the filter 65 is blown off, and the separated water retaining grout 21 is dropped onto the stirring blade 53 (see arrow A6).

[Suction of water retention grout]
Next, with reference to FIG. 7 in addition to FIGS. 4 and 5, a situation in which the water retention grout injected into the open-graded asphalt mixture layer 10 is sucked using the water retention grout suction device 50 will be described. .

  As shown in FIG. 4 and FIG. 7, the compressor 74 is operated to make the suction negative pressure in the negative pressure chamber 52 a of the stirring vessel 52. Next, the suction nozzle 60 is brought into contact with the surface of the open particle size asphalt mixture layer 10 into which the water retention grout 21 has been injected, and a predetermined amount of the water retention grout 21 is sucked (see arrow A7). Next, while the suction nozzle 60 is in contact, the suction nozzle 60 is moved along the surface to suck the surface side portion of the injected water retention grout 21. As a result, a continuous gap 31a is formed in the portion where the water retention grout 21 is sucked.

  The degree to which the water retention grout 21 is sucked may be changed as appropriate, and the pavement upper part 31 (see FIG. 8) having a continuous void 31a after construction has a noise reduction function, a temporary storage function, and a drainage function. To do. That is, the water retention grout 21 is sucked so that the thickness of the pavement upper part 31 is about 2 to 3 cm, regardless of the thickness of the open-graded asphalt mixture layer 10.

  In the suction of the water retention grout 21, the surface side (road surface side) water retention grout 21 is sucked, but remains on the surface of the asphalt mortar 12 of the open-graded asphalt mixture layer 10. The remaining water retaining grout 21 is hardened after the construction to become a water retaining film 23 (see FIG. 8).

<After construction-water-retaining pavement>
In this way, a water-retaining pavement 30 as shown in FIG. 8 can be constructed (constructed). Such a water-retaining pavement 30 includes a pavement upper part 31 having continuous voids 31a and a pavement lower part 32 in which the water-retaining grout 21 is hardened and filled with a water-retaining material 22 having water retentivity. Thus, although the water-retaining pavement 30 can be divided into the pavement upper part 31 and the pavement lower part 32 for convenience, the open-graded asphalt mixture layer 10 as the base is common, so the pavement Naturally, the upper part 31 and the pavement lower part 32 are integrated, the strength is high, and it has high flow resistance.
Moreover, since the pavement upper part 31 of the water-retaining pavement 30 has a continuous gap 31a, a noise reduction function for reducing noise, a temporary storage function for temporarily storing in the continuous gap 31a, rainwater, etc. And a drainage function for draining.

  In the upper part 31 of the pavement, a water retention film 23 formed by curing the remaining water retention grout 21 is formed outside the asphalt mortar 12 constituting the open-graded asphalt mixture layer 10. The water retaining film 23 is continuous with the water retaining material 22 in the pavement lower part 32, and the water retained in the water retaining material 22 can flow to the surface side through the water retaining film 23 (arrow). A8). Thereby, the temperature (road surface temperature) of the pavement upper part 31 can be rapidly lowered under a hot summer sun.

  Therefore, according to the pavement upper part 31 of such a water-retaining pavement 30, by having the continuous air gap 31a on the road surface side (surface side), it is possible to reduce noise caused by vehicle traffic. Further, according to the water-retaining pavement 30, water due to water sprinkling or rainwater can be temporarily stored in the continuous gap 31 a, and the temporarily stored water can be supplied to the water retention material 22. . Furthermore, according to the water-retaining pavement 30, rainwater or the like can be drained, and as a result, it is possible to prevent rainwater from accumulating on the surface (that is, the road surface) of the pavement upper part 31. Furthermore, the pavement upper part 31 has the water-retaining film 23 that is continuous with the water-retaining material 22, so that the road surface temperature can be quickly lowered.

  Further, the pavement lower part 32 is provided with a water retention material 22 having water retention in the continuous void 10a of the open-graded asphalt mixture layer 10 as a base material, so that rainwater drained from the pavement upper part 31 can be improved. Can hold water.

  As mentioned above, although an example was described about suitable embodiment of this invention, this invention is not limited to the said embodiment, For example, the following appropriate changes are possible in the range which does not deviate from the meaning of this invention.

  In the above-described embodiment, the case where the open particle size mixture layer is an open particle size asphalt mixture layer has been described, but the type of the open particle size mixture layer is not limited to this, and for example, an open particle size concrete mixture layer and the like. Also good.

  In the above-described embodiment, in order to simplify the description, the case where the construction method of the water-retaining pavement is applied to a portion having no longitudinal gradient or crossing gradient is described, but the construction location (site) is not limited to this. Any location may be used.

  In the above-described embodiment, one filter 65 and two ejectors 71 are provided and suction is performed in two lines from the hollow portion 65a of the filter 65. However, a plurality of filters 65 and a plurality of ejectors 71 are further provided from the hollow portion 65a. The suction negative pressure may be controlled by adopting a configuration in which suction is performed in a plurality of systems of three systems, four systems, ..., and by providing a ball valve in each system and adjusting the number of ball valves to be opened / closed.

  In the above-described embodiment, the case where the water-retaining pavement 30 is constructed on the impermeable layer S has been described. However, the present invention is not limited thereto. For example, asphalt emulsion or sand is sprayed on the roadbed on the sidewalk. The water-retaining pavement 30 may be constructed after the water shielding treatment.

  In the above-described embodiment, the case where the water retention grout spraying device 40 is used to spray the water retention grout 21 has been described, but the water retention grout 21 is sprayed without using the water retention grout spraying device 40. Needless to say.

  In the above-described embodiment, when the water-retaining pavement 30 is constructed, the pavement construction method according to the present invention is applied. However, the scope of the present invention is not limited to this, for example, You may apply when cement milk (grouting) is inject | poured into the open-graded-size asphalt mixture layer used as a base | substrate, and a semiflexible pavement is constructed | assembled. In this case, after the construction, it is possible to construct a pavement including a pavement lower part having a high strength by pouring and hardening cement milk and a pavement upper part having a continuous gap on the surface side.

It is sectional drawing explaining the construction method of the water retention pavement which concerns on this embodiment, and shows before injection | pouring of a water retention grout. It is a side view of a water retention grout spraying device which sprays water retention grout. It is sectional drawing explaining the construction method of the water retention pavement which concerns on this embodiment, and shows the dispersion | spreading and injection | pouring condition of a water retention grout. It is a side view of the water retention grout suction device which attracts water retention grout. It is a top view of the water retention grout suction device which attracts | sucks water retention grout. It is a figure from the back surface side of a suction nozzle. It is sectional drawing explaining the construction method of the water retention pavement which concerns on this embodiment, and shows the suction condition of water retention grout. It is sectional drawing of the water retention pavement constructed | assembled by the construction method of the water retention pavement which concerns on this embodiment.

Explanation of symbols

10 Open particle size asphalt mixture layer (open particle size mixture layer)
10a Continuous void 21 Water retaining grout 22 Water retaining material 23 Water retaining film 30 Water retaining pavement 31 Pavement upper part 31a Continuous void 50 Water retaining grout suction device 52 Stirring vessel 53 Stirring blade (stirring means)
54 Motor (stirring means)
60 Suction nozzle 65 Filter (separation means)
70 Suction negative pressure generating unit (suction negative pressure generating means)
71 Ejector

Claims (2)

A first step of injecting grout into the continuous voids of the open particle size mixture layer to the surface side of the open particle size mixture layer;
By sucking the injected grout to form a layer having continuous voids with a depth of 2 cm to 3 cm on the surface side, noise reduction function, temporary storage on the lower part of the pavement where the continuous voids are filled with grout A second step of forming a pavement upper portion having a function and a drainage function ;
A pavement construction method comprising:   The pavement construction method according to claim 1, wherein the grout is a water retention grout that becomes a water retention material having water retention after curing.

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