JP2008095337A - Paved road construction method - Google Patents

Paved road construction method Download PDF

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JP2008095337A
JP2008095337A JP2006276630A JP2006276630A JP2008095337A JP 2008095337 A JP2008095337 A JP 2008095337A JP 2006276630 A JP2006276630 A JP 2006276630A JP 2006276630 A JP2006276630 A JP 2006276630A JP 2008095337 A JP2008095337 A JP 2008095337A
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surface layer
water
pavement
retaining material
layer
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Noboru Nonoyama
登 野々山
Takeshi Koguchi
武志 構口
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FUJITA ROAD CONSTRUCTION CO Ltd
Fujita Corp
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FUJITA ROAD CONSTRUCTION CO Ltd
Fujita Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a paved road construction method for preventing the occurrence of the heat island phenomenon further effectively by combining photocatalyst pavement and water holding property pavement mutually to construct a paved road. <P>SOLUTION: A base course 14 formed by coarse-graded asphalt concrete is constructed on a roadbed 12. A surface layer 16 formed by open-graded asphalt concrete having large cavities is constructed on the base course 14 by thickness of 50-100 mm. A water holding material 20 is filled into the surface layer 16 so that a part filled not with the water holding material 20 remains in depth of about 10-30 mm from a surface of the surface layer 16 to construct the water holding property pavement. A chemical 22 containing photocatalyst is applied on the surface of the surface layer 16 for coating. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は大気汚染物質であるＮＯｘ処理機能を有する光触媒舗装（フォトロード工法）およびヒートアイランド現象対策として期待されている保水性舗装を組み合わせた道路舗装工法に関する発明である。   The present invention relates to a road pavement construction method that combines a photocatalytic pavement (photo road construction method) having a function of treating NOx that is an air pollutant and a water retention pavement that is expected as a countermeasure for the heat island phenomenon.

保水性舗装は、空隙率が20〜30%と高空隙な開粒アスコン舗装に鉱物性微粉末・樹脂・セメント等の保水材を充填することにより施工する。
保水性舗装の一般的な構造は路床上に路盤、基層、最上部である表層として高空隙な開粒アスコン層を施工する。保水材は、表層を構成する高空隙開粒アスコンに水などと混合してスラリー状として流し込んで充填する。
保水性舗装は、表層内に充填した保水材により雨水などを吸水し、晴天時に蒸発気化熱により路面温度の上昇を抑えるものである。
保水性舗装は、真夏の晴天時の昼間では通常舗装と比較して表面温度を10〜20℃程度低減することができるためヒートアイランド現象の抑制技術として注目されている。 Water-retaining pavement is constructed by filling water-retaining materials such as mineral fine powder, resin, cement, etc. into a high-gap, open-grain ascon pavement with a porosity of 20-30%.
The general structure of water-retaining pavement consists of a roadbed, base layer, and a high-granulated ascon layer as the top layer on the roadbed. The water-retaining material is mixed with water or the like into the high void-granulated ascon that constitutes the surface layer and poured into a slurry to be filled.
The water-retaining pavement absorbs rainwater and the like with a water-retaining material filled in the surface layer, and suppresses an increase in road surface temperature by heat of vaporization and evaporation in fine weather.
Water-retaining pavement is attracting attention as a technology for suppressing the heat island phenomenon because it can reduce the surface temperature by about 10 to 20 ° C. compared to normal pavement in the daytime in fine weather in midsummer.

一方、光触媒舗装（フォトロード工法）は排水性舗装表面に光触媒を含むセメント系塗布材をスプレー状に噴霧して塗布することにより自動車排気ガス中の窒素酸化物を処理する工法である（例えば、特許文献１、特許文献２）。
ここで、排水性舗装は、上部に水を通し易い透水層を設け、この透水層の直下に不透水層を設け、雨水を透水層に浸透させ不透水層により側溝などへ導くようにしたものである。
光触媒舗装では、舗装表面の光触媒（二酸化チタン）は太陽光を受けることにより強い酸化作用を示し、窒素酸化物（ＮＯおよびＮＯ２）が酸化されて硝酸となる。硝酸は舗装表面で光触媒塗布材の主成分であるカルシウム（Ｃａ）と化合して硝酸カルシウムとして固定され、降雨時に硝酸イオンおよびカルシウムイオンとして洗い流される。
特許第３７４０５９７号 特許第３７４０５９８号 On the other hand, photocatalytic pavement (photo road method) is a method of treating nitrogen oxides in automobile exhaust gas by spraying and applying a cement-based coating material containing a photocatalyst to the drainage pavement surface in a spray form (for example, Patent Document 1 and Patent Document 2).
Here, the drainage pavement has a water permeable layer that allows easy passage of water in the upper part, a water impermeable layer is provided directly below this water permeable layer, and rainwater penetrates into the water permeable layer so that it is guided to the lateral grooves by the water impermeable layer. It is.
In photocatalytic pavement, the photocatalyst (titanium dioxide) on the pavement surface exhibits a strong oxidizing action when it receives sunlight, and nitrogen oxides (NO and NO 2 ) are oxidized into nitric acid. Nitric acid combines with calcium (Ca), which is the main component of the photocatalyst coating material, on the pavement surface and is fixed as calcium nitrate, and is washed away as nitrate ions and calcium ions during rainfall.
Japanese Patent No. 3740597 Japanese Patent No. 3740598

本発明者は、光触媒舗装において光触媒により汚染空気を浄化（窒素酸化物（NOx）を処理）を行なうのみならず、光触媒の遮熱性により舗装表面の温度の低減効果が発揮される事を発見した。
そして、光触媒舗装によりヒートアイランド現象の抑制をより効果的に行なえないものかを思案した。
本発明は前記事情に鑑み案出されたものであって、本発明の目的は、光触媒舗装と保水性舗装とを組み合わせることでヒートアイランド現象の抑制をより一層効果的に図れる舗装道路を施工できる道路舗装工法を提供することにある。 The present inventor has discovered that in photocatalytic pavement, not only purifying polluted air (treating nitrogen oxide (NOx)) with a photocatalyst but also the effect of reducing the temperature of the pavement surface due to the heat shielding property of the photocatalyst. .
And we wondered if the heat island phenomenon could be suppressed more effectively by photocatalytic pavement.
The present invention has been devised in view of the above circumstances, and the object of the present invention is a road on which a paved road can be constructed that can more effectively suppress the heat island phenomenon by combining photocatalytic pavement and water retention pavement. The purpose is to provide a paving method.

前記目的を達成するため本発明は、路盤の上に粗粒アスコンからなる基層を施工し、前記基層の上に、高空隙の開粒アスコンからなる表層を５０ｍｍから１００ｍｍの厚さで施工し、次に、前記表層に、保水材が充填されない部分が前記表層の表面から１０mmから３０mm程度の深さで残るように保水材を充填し、次に、前記表層の表面に光触媒を含む薬剤を塗布してコーティングすることを特徴とする。   In order to achieve the above object, the present invention constructs a base layer made of coarse grain ascon on a roadbed, and constructs a surface layer made of high-gap, open grain ascon on the base layer in a thickness of 50 mm to 100 mm, Next, the surface layer is filled with a water retention material so that a portion not filled with the water retention material remains at a depth of about 10 mm to 30 mm from the surface layer, and then a chemical containing a photocatalyst is applied to the surface layer surface. And coating.

本発明によれば、保水性舗装であることから舗装表面の温度上昇を抑え、ヒートアイランド現象を抑制する上で有利となる。
また、保水性舗装の表面が、光触媒を含む薬剤でコーティングされているので、汚染空気が浄化（窒素酸化物（NOx）を処理）されるのみならず、光触媒の遮熱性により舗装表面の温度の低減効果が発揮される。
したがって、本発明の道路舗装工法によれば、ヒートアイランド現象の抑制をより一層効果的に図る上で有利となる。 According to the present invention, since it is a water-retaining pavement, it is advantageous in suppressing the temperature rise of the pavement surface and suppressing the heat island phenomenon.
In addition, since the surface of the water-retaining pavement is coated with a chemical containing a photocatalyst, not only is the contaminated air purified (treated with nitrogen oxides (NOx)), but the heat-shielding property of the photocatalyst also increases the temperature of the pavement surface. Reduction effect is exhibited.
Therefore, according to the road pavement construction method of the present invention, it is advantageous to further effectively suppress the heat island phenomenon.

以下、本発明の実施の形態を図面にしたがって説明する。
図１は本工法による保水性舗装上への光触媒舗装施工後の断面図を示す。
まず、路盤１２の上に粗粒アスコンからなる基層１４を施工する。
次に、基層１４の上に、高空隙の開粒アスコンからなる表層１６を５０ｍｍから１００ｍｍの厚さで施工する。
次に、表層１６に、保水材２０が充填されない部分が表層１６の表面から１０mmから３０mm程度の深さで残るように保水材２０を充填し、保水性舗装を施工する。
保水性舗装は、保水材２０を流動状態で高空隙の開粒アスコン舗装（表層１６）の空隙に流し込むことにより施工する。
ここで、保水材２０に吸収して保水される水は表層１６の表面から流入するため、必ずしも表層１６の表面まで保水材２０を充填する必要は無い。
充填した保水材２０による吸水量は５〜10リッター／m2程度である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a cross-sectional view after the photocatalytic pavement construction on the water-retaining pavement by this construction method.
First, a base layer 14 made of coarse grain ascon is applied on the roadbed 12.
Next, a surface layer 16 made of high-gap, open-grain ascon is applied on the base layer 14 to a thickness of 50 mm to 100 mm.
Next, the water retaining material 20 is filled in the surface layer 16 so that a portion not filled with the water retaining material 20 remains at a depth of about 10 mm to 30 mm from the surface of the surface layer 16, and water retaining pavement is applied.
The water-retaining pavement is constructed by pouring the water-retaining material 20 into a void in a high-gap, open-grain ascon pavement (surface layer 16) in a fluid state.
Here, the water retained by being absorbed by the water retaining material 20 flows from the surface of the surface layer 16, and therefore, it is not always necessary to fill the surface of the surface layer 16 with the water retaining material 20.
The amount of water absorbed by the filled water retaining material 20 is about 5 to 10 liters / m 2 .

次に、表層１６の表面に光触媒を含む薬剤２２を塗布してコーティングする。
表層１６の表面への薬剤２２によるコーティングは、表層１６の表面から１０mmから２０mm程度の深さまで行なわれる。
すなわち、表層１６の表面への薬剤２２によるコーティングは、保水材２０が充填されていない箇所に対して行なわれる。
本実施の形態では、表層１６の表面への薬剤２２によるコーティングは、保水材２０が充填された箇所の上に、保水材２０が充填されていない箇所（１０mm程度の厚さで保水材２０が充填されていない箇所）を残す深さで行なわれる。 Next, a drug 22 containing a photocatalyst is applied and coated on the surface of the surface layer 16.
The surface of the surface layer 16 is coated with the drug 22 to a depth of about 10 mm to 20 mm from the surface of the surface layer 16.
That is, the surface of the surface layer 16 is coated with the chemical 22 on the portion where the water retaining material 20 is not filled.
In the present embodiment, the surface of the surface layer 16 is coated with the drug 22 on the portion where the water retaining material 20 is filled on the portion where the water retaining material 20 is not filled (the water retaining material 20 is about 10 mm thick). This is done at a depth that leaves unfilled areas.

本発明の道路舗装工法によれば、保水性舗装であることから舗装表面の温度上昇を抑え、ヒートアイランド現象を抑制する上で有利となる。
また、保水性舗装の表面が、光触媒を含む薬剤２２でコーティングされているので、汚染空気が浄化（窒素酸化物（NOx）を処理）されるのみならず、光触媒の遮熱性により舗装表面の温度の低減効果が発揮される。
窒素酸化物(NOx)の処理能力は、施工現場等での測定結果によると都心部の交通量の多い舗装において50〜60mg/m2・日(二酸化窒素換算値)程度である。
試験体を使用した試験結果によると、表面から20mm程度まで保水材２０を充填した保水性舗装（１）と比較して、表面に光触媒を含む薬剤２２をコーティングした本工法試験体（２）は表面での遮熱性効果により、表面温度の低減効果が顕著であった。
図２に、曝露試験体の表面温度測定結果を示す。
したがって、本発明の道路舗装工法によれば、ヒートアイランド現象の抑制をより一層効果的に図る上で有利となる。 According to the road pavement method of the present invention, since it is a water-retaining pavement, it is advantageous in suppressing the temperature rise of the pavement surface and suppressing the heat island phenomenon.
In addition, since the surface of the water-retaining pavement is coated with the chemical 22 containing the photocatalyst, not only the contaminated air is purified (nitrogen oxide (NOx) treatment) but also the temperature of the pavement surface due to the heat shielding property of the photocatalyst. The reduction effect is exhibited.
Nitrogen oxide (NOx) treatment capacity is about 50 to 60 mg / m 2 · day (nitrogen dioxide equivalent value) in pavements with heavy traffic in the city center according to measurement results at construction sites.
According to the test results using the test body, compared with the water-retaining pavement (1) filled with the water-retaining material 20 up to about 20 mm from the surface, this method test body (2) coated with the chemical 22 containing the photocatalyst on the surface is Due to the heat shielding effect on the surface, the effect of reducing the surface temperature was remarkable.
In FIG. 2, the surface temperature measurement result of an exposure test body is shown.
Therefore, according to the road pavement construction method of the present invention, it is advantageous to further effectively suppress the heat island phenomenon.

また、本発明の道路舗装工法において、表層１６の表面への薬剤２２によるコーティングは、表層１６への保水材２０の充填後で保水材２０が固化した後に、表層１６の表面を、水およびブラシによる洗浄を行ない、表層１６の表面に付着した保水材２０を取り除いた後に行うようにしてもよい。
すなわち、高空隙の開粒アスコン舗装（表層１６）の空隙に保水材２０を流動状態で流し込むことにより施工する保水性舗装施工後で、保水材２０が乾燥固化（１〜３日程度で固化）した後に、水およびブラシなどを使用して表層１６の表面を清掃する。そして、表層１６の表面がほぼ乾燥した後、光触媒を含む薬剤２２を塗布して表層１６の表面をコーティングする。
この場合、ブラシに代えて高圧水を表層１６の表面に噴射し、表層１６の表面に付着した保水材２０を取り除くようにしてもよい。すなわち、高空隙の開粒アスコン舗装（表層１６）の空隙に保水材２０を流動状態で流し込むことにより施工する保水性舗装施工後で、保水材２０が乾燥固化（１〜３日程度で固化）した後に、高圧水を表層１６の表面に噴射し表層１６の表面を清掃する。そして、表層１６の表面がほぼ乾燥した後、光触媒を含む薬剤２２を塗布して表層１６の表面をコーティングする。表層１６の表面に噴射の高圧水の圧力は、例えば、５０〜１５０ｋｇｆ／ｃｍ２である。 In the road pavement method of the present invention, the coating of the surface layer 16 with the chemical 22 is performed after the water retaining material 20 is solidified after the surface layer 16 is filled with the water retaining material 20, and then the surface 16 is coated with water and a brush. The cleaning may be performed after removing the water retaining material 20 adhering to the surface of the surface layer 16.
That is, the water-retaining material 20 is dried and solidified (solidified in about 1 to 3 days) after the water-retaining pavement construction is performed by pouring the water-retaining material 20 into the voids of the high-gap, open-grain ascon pavement (surface layer 16). After that, the surface of the surface layer 16 is cleaned using water and a brush. Then, after the surface of the surface layer 16 is almost dried, a drug 22 containing a photocatalyst is applied to coat the surface of the surface layer 16.
In this case, high pressure water may be sprayed on the surface of the surface layer 16 instead of the brush, and the water retaining material 20 attached to the surface of the surface layer 16 may be removed. That is, the water-retaining material 20 is dried and solidified (solidified in about 1 to 3 days) after the water-retaining pavement construction is performed by pouring the water-retaining material 20 into the voids of the high-gap, open-grain ascon pavement (surface layer 16). After that, the surface of the surface layer 16 is cleaned by spraying high-pressure water onto the surface of the surface layer 16. Then, after the surface of the surface layer 16 is almost dried, a drug 22 containing a photocatalyst is applied to coat the surface of the surface layer 16. The pressure of the high-pressure water sprayed on the surface of the surface layer 16 is, for example, 50 to 150 kgf / cm 2 .

このように表層１６の表面を清掃することにより、保水材２０を充填後、未清掃で薬剤２２をコーティングする方法と比較して薬剤２２（光触媒層）の付着性能を向上することができる。
保水材２０の充填後、薬剤２２の塗布前に水およびブラシによる洗浄で、また、高圧水による洗浄で、薬剤２２の付着性が向上していることを示す表面摩耗(模擬スイパー)試験結果を図３に示す。
なお、図３において、光触媒舗装とは、表層１６の表面に、光触媒を含む薬剤２２を塗布してコーティングした舗装であり、光触媒層とは、光触媒を含む薬剤２２によりコーティングした部分である。 By cleaning the surface of the surface layer 16 in this manner, the adhesion performance of the drug 22 (photocatalyst layer) can be improved as compared with the method of coating the drug 22 without filling after filling the water retaining material 20.
The surface wear (simulated swipe) test results showing that the adhesion of the drug 22 is improved by filling with water and a brush after applying the water retaining material 20 and before applying the drug 22 and by washing with high-pressure water. As shown in FIG.
In FIG. 3, the photocatalytic pavement is a pavement in which the surface 22 is coated with a chemical 22 containing a photocatalyst, and the photocatalytic layer is a portion coated with the photocatalyst 22.

本工法による保水性舗装上への光触媒舗装施工後の断面図である。It is sectional drawing after photocatalyst pavement construction on the water retention pavement by this construction method. 曝露試験体の表面温度測定結果を示す表である。It is a table | surface which shows the surface temperature measurement result of an exposure test body. 表面摩耗(模擬スイパー)試験結果を示す表である。It is a table | surface which shows a surface abrasion (simulation swipe) test result.

符号の説明Explanation of symbols

１２……路盤、１４……基層、１６……表層、２０……保水材、２２……光触媒を含む薬剤。   12 ... Roadbed, 14 ... Base layer, 16 ... Surface layer, 20 ... Water retention material, 22 ... Drug containing photocatalyst.

Claims (5)

路盤の上に粗粒アスコンからなる基層を施工し、
前記基層の上に、高空隙の開粒アスコンからなる表層を５０ｍｍから１００ｍｍの厚さで施工し、
次に、前記表層に、保水材が充填されない部分が前記表層の表面から１０mmから３０mm程度の深さで残るように保水材を充填し、
次に、前記表層の表面に光触媒を含む薬剤を塗布してコーティングする、
ことを特徴とする道路舗装工法。 A base layer made of coarse ascon on the roadbed,
On the base layer, a surface layer made of high-gap, open-grain ascon is applied at a thickness of 50 to 100 mm,
Next, the surface layer is filled with a water retention material so that a portion not filled with the water retention material remains at a depth of about 10 mm to 30 mm from the surface of the surface layer,
Next, a drug containing a photocatalyst is applied and coated on the surface of the surface layer.
Road pavement construction method characterized by that. 前記表層の表面への前記薬剤によるコーティングは、
前記表層への前記保水材の充填後で前記保水材が固化した後に、前記表層の表面を、水およびブラシによる洗浄を行ない、前記表層の表面に付着した保水材を取り除いた後に行う、
ことを特徴とする請求項１記載の道路舗装工法。 Coating with the drug on the surface of the surface layer,
After the water retaining material is solidified after filling the surface layer with the water retaining material, the surface of the surface layer is washed with water and a brush, and the water retaining material attached to the surface of the surface layer is removed.
The road pavement construction method according to claim 1. 前記表層の表面への前記薬剤によるコーティングは、
前記表層への前記保水材の充填後で前記保水材が固化した後に、前記表層の表面に高圧水を噴射し前記表層の表面に付着した保水材を取り除いた後に行う、
ことを特徴とする請求項１記載の道路舗装工法。 Coating with the drug on the surface of the surface layer,
After the water retaining material is solidified after filling the surface layer with the water retaining material, high pressure water is sprayed onto the surface of the surface layer to remove the water retaining material attached to the surface of the surface layer,
The road pavement construction method according to claim 1. 前記表層の表面への前記薬剤によるコーティングは、前記表層の表面から１０mmから２０mm程度の深さまで行なわれる、
ことを特徴とする請求項１乃至３に何れか１項記載の道路舗装工法。 The coating with the drug on the surface of the surface layer is performed to a depth of about 10 mm to 20 mm from the surface of the surface layer.
The road pavement construction method according to any one of claims 1 to 3, wherein the road pavement construction method is provided. 前記表層の表面への前記薬剤によるコーティングは、前記保水材が充填された箇所の上に保水材が充填されていない箇所を残す深さで行なわれる、
ことを特徴とする請求項１乃至４に何れか１項記載の道路舗装工法。 The coating with the drug on the surface of the surface layer is performed at a depth that leaves a portion not filled with the water retaining material on the portion filled with the water retaining material,
The road pavement method according to any one of claims 1 to 4, wherein the road pavement method is provided.
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