JP3478431B2

JP3478431B2 - Road structure and construction method

Info

Publication number: JP3478431B2
Application number: JP03819795A
Authority: JP
Inventors: 研二鈴川; 光伸大谷; 学宮崎
Original assignee: Toray Industries Inc
Current assignee: Toray Industries Inc
Priority date: 1995-02-27
Filing date: 1995-02-27
Publication date: 2003-12-15
Anticipated expiration: 2018-12-15
Also published as: JPH08231283A

Description

Detailed Description of the Invention

【産業上の利用分野】この発明は、透水性ブロックを用
いた、たとえば、車道、歩道、公園その他の広場、駐車
場、各種建造物（ビル等）の外構等の道路構造物および
その施工方法に関する。This invention uses a water-permeable block.
There was, for example, roadway, sidewalk, park and other open space, parking, various buildings road structures of outside 構等 of (buildings, etc.) and
It related to the construction stage how.

【従来の技術】近年、雨水を地中に還元することによっ
て下水道や都市河川に流入する雨水を低減し、下水処理
場の負担を軽減したり、河川の氾濫を防止したりするこ
とが重要な課題となっている。また、雨水を地中に還元
することによって地下水の枯渇を防ぎ、地盤沈下を防止
したり、都市部における植栽を促進したりすることも重
要なことである。さらに、降雨時の跳ね返りが少なく、
水溜まりのできにくい、歩行感に優れた歩道も要求され
ている。透水性ブロックを用いた道路構造物は、このよ
うな要求を満たすのに好適なものとして注目されてい
る。さて、そのような道路構造物に用いる透水性ブロッ
クとしては、たとえば特公平５−４８３２１号公報に記
載されているようなものが知られている。この従来のブ
ロックは、無機質骨材を焼き固めてなり、表層と基層と
の２層構成を有し、基層には表層よりも大きな骨材を使
用し、透水性が高く、しかも、長期間使用しても目詰り
による透水機能の低下が小さいとしている。すなわち、
基層に表層よりも大きな骨材を使用することで基層の孔
径が表層のそれよりも大きくなり、透水性が向上するう
えに、微細な砂等の目詰り成分が表層から基層へとよく
流れるので透水機能の低下も小さくなるというものであ
る。しかしながら、ブロック内を水が流下する量や速
度、すなわち透水性は、空隙率、特に表層の空隙率に大
きく支配されるので、基層の孔径を表層のそれよりも大
きくするということだけでは透水性は向上しない。ま
た、上記従来のブロックは、表層にその骨材の粒径の約
１／１０程度の大きさの孔が存在し、基層の孔は表層の
それの４〜５倍程度であることが好ましいとしている
が、用いる骨材の粒度分布によっては表層の孔径が著し
く小さくなり、空隙率が低くなって透水性が低下するば
かりか、表層から基層への目詰り成分の流下が阻害され
るようになるので透水機能の低下も大きくなる。さら
に、基層の孔径が大きくなると骨材間の結合強度が低く
なり、ブロック全体の強度が低下するという問題もあ
る。2. Description of the Related Art In recent years, it has been important to reduce rainwater flowing into sewers and urban rivers by returning rainwater to the ground to reduce the burden on sewage treatment plants and prevent river flooding. It has become a challenge. Further, rainwater and prevent depletion of groundwater by reducing the ground, or to prevent subsidence, it is important or to promote planting in urban areas. Furthermore, there is little bounce when it rains,
There is also a demand for a walkway that is less likely to collect water and has an excellent walking feel. A road structure using a water-permeable block is drawing attention as being suitable for satisfying such requirements. As a water permeable block used for such a road structure , for example, one described in Japanese Patent Publication No. 5-48321 is known. This conventional block is made of solidified inorganic aggregate and has a two-layer structure consisting of a surface layer and a base layer. The base layer uses an aggregate larger than the surface layer, has high water permeability, and is used for a long period of time. Even so, the decrease in water permeability due to clogging is said to be small. That is,
By using an aggregate larger than the surface layer for the base layer, the pore size of the base layer becomes larger than that of the surface layer, water permeability is improved, and clogging components such as fine sand flow well from the surface layer to the base layer. The reduction in water permeability is also small. However, the amount and speed of water flowing down in the block, that is, the water permeability, is largely governed by the porosity, especially the porosity of the surface layer, so just making the pore size of the base layer larger than that of the surface layer results in water permeability. Does not improve. Further, in the above conventional block, it is preferable that the surface layer has pores having a size of about 1/10 of the particle diameter of the aggregate, and the pores of the base layer are about 4 to 5 times as large as those of the surface layer. However, depending on the particle size distribution of the aggregate used, the pore size of the surface layer becomes extremely small, the porosity decreases and the water permeability decreases, as well as the flow of clogging components from the surface layer to the base layer becomes obstructed. As a result, the deterioration of water permeability is also large. Further, when the pore diameter of the base layer is large, the bonding strength between the aggregates is low, and the strength of the entire block is also low.

【発明が解決しようとする課題】この発明の目的は、従
来の透水性ブロックの上述した問題点を解決し、透水性
や強度に優れているばかりか、長期間使用しても目詰り
の心配が少なく、透水機能の低下が小さい透水性ブロッ
クを用いた、特に歩道、公園その他の広場等の道路構造
物およびその施工方法を提供することにある。SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems of the conventional water-permeable block, not only it is excellent in water permeability and strength, but also there is a risk of clogging even after long-term use. Water-permeable block with less deterioration in water permeability
Using a click, especially sidewalks, parks and other wide field such as road construction
To provide an object and a construction method thereof .

【課題を解決するための手段】上記目的を達成するため
に、この発明は、路盤上に敷設した不織布と、この不織
布の上に形成したサンドクッション層と、このサンドク
ッション層の上に並べて敷設した透水性ブロックと、隣
接する透水性ブロック間に形成した砂目地とを有する道
路構造物であって、前記透水性ブロックは、空隙率が２
０〜５０％の範囲内にある表層と、空隙率が１０％以上
で、かつ、上記表層よりも低い空隙率を有する基層との
層状構成を有し、かつ、透水係数が１×１０^-2ｃｍ／ｓ
ｅｃ以上の透水性ブロックである道路構造物を提供す
る。本発明の道路構造物に用いられる透水性ブロックの
表層および基層は無機質骨材を含み、最大寸法および平
均粒径において表層の骨材は基層の骨材よりも小さく、
かつ、表層の骨材の平均粒径が０．５〜２ｍｍの範囲内
にあり、基層の骨材の平均粒径が１．５〜２．５ｍｍの
範囲内にあるのが好ましい。また、透水性ブロックは、
曲げ強度が３０ｋｇｆ／ｃｍ²以上で、かつ、圧縮強度
が１６０ｋｇｆ／ｃｍ²以上であるのが好ましい。ま
た、表層は、表面のモース硬度が６以上で、湿潤時にお
ける滑り抵抗値が４０以上であるのが好ましい。さら
に、表層の厚みが４〜１５ｍｍの範囲内にあり、かつ、
全体厚みが４０〜１００ｍｍの範囲内にあるのが好まし
い。施工面からみると、表層の表面の周縁に面取りまた
は丸みが付与されていたり、側面形状が台形であるのが
好ましいし、側面に目地幅規制用の突起を設けておくの
も好ましいことである。車道等、高荷重が加わる道路構
造物にあっては、路盤と不織布との間に、透水性を有す
る耐荷重層を設けておくことが好ましい。さらにまた、
この発明は、路盤上に透水性を有する耐荷重層を設け、
この耐荷重層の上に不織布を敷き、その不織布の上にサ
ンドクッション層を設け、そのサンドクッション層の上
に、空隙率が２０〜５０％の範囲内にある表層と、空隙
率が１０％以上で、かつ、上記表層よりも低い空隙率を
有する基層との層状構成を有し、かつ、透水係数が１×
１０ ^-2 ｃｍ／ｓｅｃ以上の透水性ブロックを敷き詰めた
後、透水性ブロック間に砂目地を形成することを特徴と
する、道路構造物の施工方法を提供する。本発明の道路
構造物の施工方法に用いられる透水性ブロックの表層お
よび基層は無機質骨材を含み、最大寸法および平均粒径
において表層の骨材は基層の骨材よりも小さく、かつ、
表層の骨材の平均粒径が０．５〜２ｍｍの範囲内にあ
り、基層の骨材の平均粒径が１．５〜２．５ｍｍの範囲
内にあるのが好ましい。また、透水性ブロックは、曲げ
強度が３０ｋｇｆ／ｃｍ ² 以上で、かつ、圧縮強度が１
６０ｋｇｆ／ｃｍ ² 以上であるのが好ましい。また、表
層は、表面のモース硬度が６以上で、湿潤時における滑
り抵抗値が４０以上であるのが好ましい。さらに、表層
の厚みが４〜１５ｍｍの範囲内にあり、かつ、全体厚み
が４０〜１００ｍｍの範囲内にあるのが好ましい。施工
面からみると、表層の表面の周縁に面取りまたは丸みが
付与されていたり、側面形状が台形であるのが好ましい
し、側面に目地幅規制用の突起を設けておくのも好まし
いことである。また、本発明の道路構造物およびその施
工方法に用いられる透水性ブロックは、重量平均におけ
る平均粒径が１．５〜２．５ｍｍの範囲内にある無機質
骨材と糊剤との混合物にバインダを添加、混合してなる
基層材料を型に入れ、好ましくは０．５〜５０ｋｇｆ／
ｃｍ²の範囲内の圧力で加圧した後、その上に、重量平
均における平均粒径が０．５〜２ｍｍの範囲内にある無
機質骨材と糊剤との混合物にバインダを添加、混合して
なる表層材料を入れ、好ましくは０．５〜５０ｋｇｆ／
ｃｍ²の範囲内の圧力で加圧、成型し、得られた成型体
を、好ましくは９００〜１，３００℃の範囲内の温度で
焼成する、透水性ブロックの製造方法によって提供され
る。基層材料における無機質骨材としては、鉄鋼スラ
グ、天然石および陶磁器から選ばれる少なくとも１種の
破砕片を用いる。また、表層材料における無機質骨材と
しては、吸水率が０．５％以下の鉄鋼スラグ、天然石お
よび磁器から選ばれる少なくとも１種の破砕片を用い
る。糊剤としては、カルボキシメチルセルロース、でん
ぷんまたは水ガラスを用いるのが好ましいし、バインダ
としては、粘土、天然石またはガラスの粉末を用いるの
が好ましい。表層材料にさらに顔料を添加、混合するの
もよい。成型には、振動プレスを用いるのが好ましい。
本発明の道路構造物およびその施工方法に用いられる透
水性ブロックは、形状的には、図１、図２に示すような
形状を有している。すなわち、厚みが４〜１５ｍｍほど
の表層１と、基層２との層状構成を有している。全体厚
みは、作用する荷重等を考慮して４０〜１００ｍｍ程度
にしてある。平面形状は方形で、大きさは、施工の容易
性等を考慮して一辺の長さが１００〜４００ｍｍ程度の
正方形か長方形にしてある。側面からみた形状は、台形
である。台形とすることで施工時における表層の欠け等
を防止でき、また、ブロック間に適度な幅の目地を形成
することができるようになる。もっとも、上底と下底と
の長さの差は、歩行感や、車椅子による走行の容易性等
を考慮して３ｍｍ以下と小さくしてある。表層１の表面
の周縁には、施工時における表層の欠けや、製造時にで
きた骨材による突起が表面から突出しないように、１〜
３Ｃ程度の面取り加工を施すか、１〜３Ｒ程度の丸みを
もたせてある。この面取りや丸みが大きすぎると、やは
り歩行感等が低下する。舗装はこのようなブロックをマ
トリクス状や千鳥状に敷き詰めることによって行うが、
その際に目地幅を適度な幅に規制するために、側面には
基層２の部分に目地幅規制用の突起３が設けられてい
る。この突起３の厚みは１〜３ｍｍ程度、高さは１０〜
８０ｍｍ程度である。なお、突起３は、ブロックを敷き
詰めたときに隣接するブロックの突起が当たらない位置
に設けておく。以下、本発明の道路構造物およびその施
工方法に用いられる透水性ブロックをその製造方法とと
もにさらに詳細に説明する。基層材料の調製工程：この
工程においては、無機質骨材に糊剤を添加、混合し、さ
らに混合物にバインダを添加、混合して基層材料を調製
する。無機質骨材としては、鉄鋼スラグ、天然石、陶磁
器等の破砕物を用いることができる。これらの２種以上
を併用してもよい。天然石としては、たとえばろう石や
アプライトを用いることができる。後の焼成時にクラッ
クを発生しにくい、堆積岩以外のものであるのが好まし
い。また、陶磁器としては、陶磁器質の瓦、タイル、土
管、その他の陶磁器廃材を用いることができる。破砕片
の大きさは、最大寸法で４．７５ｍｍ以下、平均粒径で
１．５〜２．５ｍｍの範囲内とする。破砕片が最大寸法
で４．７５ｍｍよりも大きく、平均粒径で２．５ｍｍよ
りも大きくなると、均一な混合、分散が難しくなり、大
きな破砕片が偏在するようになって空隙率の大きな部分
や小さな部分ができ、ブロックの曲げ強度や圧縮強度が
低下するようになる。また、平均粒径が１．５ｍｍより
も小さいと透水性が低下するようになる。このように、
破砕片の最大寸法や平均粒径は、透水性、曲げ強度、圧
縮強度等に影響を与える。そして、基層の空隙率が１０
％に満たないと、たとえ表層の空隙率が２５〜５０％の
範囲にあっても、ブロック全体の透水係数は低下し、透
水性ブロックとして必要な１×１０^-2ｃｍ／ｓｅｃとい
う値よりも低くなってしまう。この透水係数の値は、河
川等の設計において一般的に用いられている、降雨量が
５０ｍｍ／時の降雨時においても雨水が溜らず、全部が
浸透するということを意味している。また、曲げ強度や
圧縮強度の低下は、搬送時や施工時、使用時等における
ブロックの破損の原因になる。上述した破砕片の最大寸
法や平均粒径は、ブロックに曲げ強度３０ｋｇｆ／ｃｍ
²以上、好ましくは５０ｋｇｆ／ｃｍ²以上、圧縮強度１
６０ｋｇｆ／ｃｍ²以上を与えるための一つの要件であ
る。この発明において破砕片の最大寸法は、ＪＩＳＺ
８８０１に規定されるふるいで骨材５００ｇをふるい分
け、重量で少なくとも８５％の骨材が通過するふるいの
うちの最小のふるいの呼び寸法として表わされる。ま
た、平均粒径は、重量平均で表わされる。さらに、空隙
率は、ブロックから表層を切削、除去し、さらに５×５
ｃｍ角の試験片を切り出し、１０５℃で２４時間乾燥し
た後に室温まで冷却したときの重量Ｗ（ｇ）と体積Ｖ
（ｃｍ³）から見掛密度ρ₁＝Ｗ／Ｖを求め、これと、同
様に処理した試験片についてアルキメデス法で求めた見
掛密度ρ₂から、次式によって求める。空隙率（％）＝（１−ρ₁／ρ₂）×１００さらにまた、曲げ強度はＪＩＳＡ１１０６に、圧縮強
度はＪＩＳＲ２２０６に、透水係数はＪＩＳＡ１２
１８にそれぞれ準拠して求める。一方、糊剤としては、
カルボキシメチルセルロース（ＣＭＣ）、でんぷん等の
有機質糊剤や、水ガラス等の無機質糊剤を用いることが
できる。有機質糊剤は、水溶液として用いる。糊剤の量
は、後の成型時における保型性や焼成時における成型体
のハンドリング性等を考慮して決めるが、通常、骨材１
００重量部に対して５〜２０重量部ほど添加する。ま
た、バインダとしては、骨材よりも融点の低い粘土、天
然石、ガラス等の粉末を用いることができる。天然石と
しては、砂岩、粘板岩、花崗岩等を用いることができ
る。焼成中に骨材やバインダに発生する歪を小さくする
ために、バインダの熱膨脹率は、骨材のそれと同等かそ
れ以上であるのが好ましい。バインダは焼成時に溶融し
て骨材同士を結合するが、バインダの最大粒径は、骨材
同士の結合が一様に行われるよう、また、焼成時の溶融
に時間がかかってエネルギーコストが上昇しないよう、
０．１ｍｍ以下とするのが好ましい。また、バインダの
量は、ブロックの強度や透水性等を考慮して決めるが、
通常、骨材１００重量部に対して３〜１５重量部ほど添
加する。さて、基層材料は、まず、無機質骨材に、液状
にした糊剤を、たとえばシャワーにして少しずつ添加し
ながら混合する。次に、無機質骨材と糊剤との混合物に
バインダを少しずつ添加しながら混合する。ここで、無
機質骨材と糊剤とをあらかじめ混合しておき、その混合
物にバインダをさらに添加、混合するのは、これら３者
を同時に混合すると糊剤と骨材やバインダとが凝集しや
すく、凝集した糊剤が成型時に型に付着したり、焼成時
に発泡して収率が低下するようになるからである。表層
材料の調製工程：表層材料もまた、基層材料と同様に調
製する。ただ、無機質骨材としては、吸水率が０．５％
以下の鉄鋼スラグ、天然石、磁器等の破砕片の少なくと
も１種を用いる。吸水率は、ＪＩＳＡ１１０９に準拠
して求める。磁器としては、磁器質のタイルや電力用碍
子等の廃材を用いることができる。吸水率が０．５％以
下の骨材を用いるのは、吸水率が０．５％を超えるよう
なものは表面が汚れやすく、しかも、水洗等による洗浄
が困難になるからである。また、摩耗しやすくなり、美
観が低下したり、摩耗によって生じた骨材粉が表層の表
面に存在するようになって湿潤時か否かにかかわらず滑
りやすくなるからである。かかる傾向は、表層の表面
の、モース氏の硬度計によるモース硬度が６未満である
ときに特に顕著になる。破砕片の大きさは、最大寸法で
２．８ｍｍ以下、平均粒径で０．５〜２ｍｍの範囲内と
する。最大寸法、平均粒径のいずれにおいても、表層の
骨材は基層のそれよりも小さい。そして、破砕片が最大
寸法で２．８ｍｍよりも大きくなると湿潤時における表
層の滑り抵抗値が小さくなり、降雨時等の湿潤時に滑り
やすくなる。換言すれば、破砕片の最大寸法は、表層の
表面の湿潤時における滑り抵抗値を４０以上という好ま
しい値にするために必要な条件の一つである。滑り抵抗
値は、ＡＳＴＭＥ３０３に準拠して求める。また、表
層の空隙率もブロック全体の透水係数等に大きな影響を
与えるが、それが２５〜５０％の範囲内にあると、雨水
等は積極的に流下させるが土砂等の目詰り成分の侵入は
抑制できるようになる。表層を着色するために、表層材
料を調製するときそれに顔料を加えることができる。顔
料としては、酸化鉄系、酸化チタン系、酸化コバルト系
等の粉末を用いることができ、通常、骨材に添加、混合
する。顔料の量は、その発色の程度等にもよるが、骨材
１００重量部に対して０．２〜１０重量部ほど添加す
る。成型工程：成型は、型を用い、焼成後において表層
および基層が所望する厚みになるよう、充填厚みを考慮
しながら、まず基層材料を充填し、０．５〜５０ｋｇｆ
／ｃｍ²の範囲内の圧力で加圧して一次成型した後、そ
の上に表層材料を充填し、再び０．５〜５０ｋｇｆ／ｃ
ｍ²の範囲内の圧力で加圧する。このとき、表層材料の
充填厚みは、ブロックの表層厚みが４〜１５ｍｍの範囲
内になるようにするのが好ましい。４ｍｍ未満になるよ
うな充填厚みでは、加圧時に基層材料が表層材料から突
き出たりすることがあり、収率が悪くなり、また、表層
の美観の上でも好ましくないからである。美観の低下
は、表層材料に顔料を添加している場合には特に著しく
なる。また、１４ｍｍを超えるようになるほどの厚みに
充填すると、透水係数が低下するようになる。また、製
造上も、顔料を添加する場合にはその使用量が多くなっ
たり、後の焼成時にひび割れを生じたり収縮が大きくな
ったりして収率が低下する。成型には振動プレス、油圧
プレス、フリクションプレス等を用いることができる
が、特に圧力が低い場合には振動プレスを用いるのが好
ましい。なお、成型圧力の好ましい範囲を０．５〜５０
ｋｇｆ／ｃｍ²としているのは、あまり低すぎると成型
ができず、高すぎると骨材が破損したりするからであ
る。焼成工程：この工程では、上述した成型工程で得ら
れた成型体を焼成し、透水性ブロックを得る。成型体
は、焼成に先立って、乾燥するか、糊剤として水ガラス
を用いている場合には炭酸ガスを作用させて水ガラスを
一次硬化させ、ハンドリングを容易にしておく。焼成に
は、トンネルキルンやローラーハースキルン等を用いる
ことができる。焼成温度は、骨材の耐熱性等を考慮して
決めるが、通常、９００〜１，３００℃の範囲内とす
る。焼成時間は、基層材料および表層材料の種類や成型
体の大きさ等にもよるので一概にはいえないが、２〜７
２時間程度である。道路構造物の施工：上述したように
して得られたブロックを用いる道路構造物の施工は、ま
ず、砂利や鉄鋼スラグ等を用いて路盤を形成し、その路
盤の上に、ポリエステル繊維等からなる不織布を敷き、
さらに不織布の上に最大寸法が４．７５ｍｍ以下の砂を
用いたサンドクッション層を設け、そのサンドクッショ
ン層の上にブロックをマトリクス状あるいは千鳥状等に
敷き詰めた後、最大寸法が１．１９ｍｍ以下の砂を散布
して砂目地を形成した後、振動をかけながら転圧してブ
ロックを固定することによって行う。不織布を用いるの
は、ブロック内を流下してきた雨水等によってサンドク
ッション層の砂が路盤内に流出しないようにするためで
ある。図３は、このようにして施工した道路構造物を示
すものである。図３において、４はブロック、５は砂目
地、６はサンドクッション層、７は不織布、８は路盤で
ある。車両が乗り入れる車道のような道路構造物を施工
する場合には、不織布７と路盤８との間に耐荷重層を設
ける。この耐荷重層は、透水係数が１×１０^-2ｃｍ／ｓ
ｅｃ以上であるような開粒度アスファルトコンクリート
層や透水性コンクリート層、直径５０ｍｍ程度の水抜き
孔を有するコンクリート層として設けることができる。In order to achieve the above object, the present invention provides a non-woven fabric laid on a roadbed and the non-woven fabric.
The sand cushion layer formed on the cloth and this sand
And the water-permeable blocks laid side by side on the cushion layer
A road with a sand joint formed between adjacent permeable blocks
The structure is a road structure, and the water-permeable block has a porosity of 2
It has a layered structure of a surface layer in the range of 0 to 50% and a base layer having a porosity of 10% or more and a porosity lower than that of the surface layer, and has a water permeability of 1 × 10 ^-2. cm / s
A road structure that is a water-permeable block of ec or more is provided. The surface layer and the base layer of the water-permeable block used in the road structure of the present invention include an inorganic aggregate, and the surface layer aggregate is smaller than the base layer aggregate in the maximum size and the average particle size.
Moreover , it is preferable that the average particle size of the aggregate of the surface layer is within a range of 0.5 to 2 mm and the average particle size of the aggregate of the base layer is within a range of 1.5 to 2.5 mm. . In addition, the water-permeable block,
In bending strength 30 kgf / cm ² or more and, preferably compressive strength of 160 kgf / cm ² or more. The surface layer preferably has a Mohs hardness of 6 or more and a slip resistance value of 40 or more when wet. Furthermore, the thickness of the surface layer is in the range of 4 to 15 mm, and
The total thickness is preferably within the range of 40 to 100 mm. Viewed from the construction surface, it is preferable that the peripheral edge of the surface of the surface layer is chamfered or rounded, or that the side surface has a trapezoidal shape, and it is also preferable to provide a protrusion for joint width regulation on the side surface. . Road structures that are subject to high loads such as roads
The structure has water permeability between the roadbed and the non-woven fabric.
It is preferable to provide a load bearing layer. Furthermore,
This invention provides a load bearing layer having water permeability on the roadbed,
A non-woven fabric is laid on this load-bearing layer, and the non-woven fabric is supported on top of it.
On the sand cushion layer.
A surface layer having a porosity in the range of 20 to 50%,
Porosity of 10% or more and lower than the surface layer
It has a layered structure with the base layer and has a water permeability of 1 ×
Laminated a water-permeable block of 10 ^-2 cm / sec or more
After that, it is characterized by forming a sand joint between the permeable blocks.
A method of constructing a road structure is provided. The road of the present invention
Surface layer of permeable block used for construction method
And base layer contain inorganic aggregate, maximum size and average particle size
In, the surface aggregate is smaller than the base aggregate, and
The average particle size of the surface aggregate is within the range of 0.5 to 2 mm.
The average particle size of the aggregate of the base layer is in the range of 1.5 to 2.5 mm
Preferably within. Also, the water-permeable block is bent
Strength is 30kgf / cm ² or more and compressive strength is 1
It is preferably 60 kgf / cm ² or more. Also, the table
The layer has a Mohs hardness of 6 or more on the surface and has a smoothness when wet.
The resistance value is preferably 40 or more. Furthermore, the surface
Is in the range of 4 to 15 mm, and the total thickness is
Is preferably in the range of 40 to 100 mm. Construction
Seen from the surface, there is a chamfer or roundness on the periphery of the surface of the surface layer.
It is preferable that it is provided or the side surface is trapezoidal.
However, it is also preferable to provide a protrusion for regulating the joint width on the side surface.
That's a good thing. Further, the road structure of the present invention and its application
The water-permeable block used in the method is a base layer material obtained by adding and mixing a binder to a mixture of an inorganic aggregate and a sizing agent having a weight-average average particle size within the range of 1.5 to 2.5 mm. Put in a mold, preferably 0.5-50kgf /
After pressurizing at a pressure within the range of cm ² , a binder is added to and mixed with the mixture of the inorganic aggregate and the sizing agent having a weight average mean particle size within the range of 0.5 to 2 mm. Is added to the surface layer material, and preferably 0.5 to 50 kgf /
pressure pressure in the range of cm ^2, molded, the resulting molded product, preferably calcined at a temperature in the range of 900～1,300 ° C., is provided by the method for producing a water-permeable blocks
It As the inorganic aggregate in the base material, at least one crushed piece selected from steel slag, natural stone and ceramics is used. As the inorganic aggregate in the surface material, at least one crushed piece selected from steel slag having a water absorption rate of 0.5% or less, natural stone, and porcelain is used. Carboxymethyl cellulose, starch or water glass is preferably used as the sizing agent, and clay, natural stone or glass powder is preferably used as the binder. It is also possible to further add and mix a pigment to the surface layer material. It is preferable to use a vibration press for molding .
The water-permeable block used in the road structure and the construction method thereof according to the present invention has a shape as shown in FIGS. 1 and 2. That is, it has a layered structure of a surface layer 1 having a thickness of about 4 to 15 mm and a base layer 2. The total thickness is set to about 40 to 100 mm in consideration of the applied load and the like. The plane shape is a square, and the size is a square or a rectangle having a side length of about 100 to 400 mm in consideration of ease of construction. The shape seen from the side is trapezoidal. By using a trapezoid, it is possible to prevent chipping of the surface layer during construction, and it is also possible to form joints with an appropriate width between the blocks. However, the difference in length between the upper bottom and the lower bottom is as small as 3 mm or less in consideration of a feeling of walking, easiness of traveling by a wheelchair, and the like. At the periphery of the surface of the surface layer 1, 1 to prevent chipping of the surface layer at the time of construction and projections due to aggregates produced at the time of production from protruding from the surface.
A chamfering process of about 3C is performed or a roundness of about 1 to 3R is provided. If the chamfer and the roundness are too large, the walking feeling and the like are deteriorated. Pavement is done by laying blocks like this in a matrix or staggered pattern.
At this time, in order to regulate the joint width to an appropriate width, a protrusion 3 for joint width regulation is provided on the side surface at the base layer 2. The protrusion 3 has a thickness of about 1 to 3 mm and a height of 10
It is about 80 mm. The protrusions 3 are provided at positions where the protrusions of adjacent blocks do not hit when the blocks are spread. Hereinafter, the road structure of the present invention and its application
The water-permeable block used in the construction method will be described in more detail together with its manufacturing method. Base layer material preparation step: In this step, a sizing agent is added to and mixed with the inorganic aggregate, and a binder is further added and mixed with the mixture to prepare a base layer material. As the inorganic aggregate, crushed materials such as steel slag, natural stone, and ceramics can be used. You may use these 2 or more types together. As the natural stone, for example, wax and aplite can be used. Other than sedimentary rock, which is less likely to crack during subsequent firing, is preferred. Moreover, as the ceramics, tiles, tiles, earthen pipes, and other waste ceramic materials can be used. The size of the crushed pieces, 4.75 mm in maximum dimension below in the range of 1.5~2.5mm in average particle size. If the maximum size of the crushed pieces is larger than 4.75 mm and the average particle size is larger than 2.5 mm, it becomes difficult to uniformly mix and disperse the crushed pieces, and large crushed pieces are unevenly distributed, which may cause a large porosity to occur. Small parts are formed, and the bending strength and compressive strength of the block are reduced. The average particle diameter will be lowered as small as permeable aqueous than 1.5 mm. in this way,
Maximum dimension and the average grain size of the crushed pieces, Toru provide aqueous, flexural strength, and impact on compressive strength. And the porosity of the base layer is 10
If the porosity of the surface layer is less than 25%, the permeability coefficient of the entire block will be lower than the value of 1 × 10 ^-2 cm / sec required for the water-permeable block even if the porosity of the surface layer is less than 25%. It will be low. This value of the hydraulic conductivity means that the rainwater does not collect even when it rains at a rainfall of 50 mm / hour, which is generally used in the design of rivers, etc., and the whole penetrates. In addition, the decrease in bending strength and compressive strength causes damage to the block during transportation, construction, use and the like. The maximum size and average particle size of the above-mentioned crushed pieces have a bending strength of 30 kgf / cm in the block.
² or more, preferably 50 kgf / cm ² or more, compressive strength 1
This is one requirement for giving 60 kgf / cm ² or more. In this invention, the maximum size of the fragment is JIS Z
500 g of aggregate is sieved through the sieve defined in 8801 and expressed as the nominal size of the smallest of the sieves through which at least 85% by weight of aggregate passes. The average particle size is represented by the weight average. Furthermore, the porosity was 5 × 5 after cutting and removing the surface layer from the block.
A cm-square test piece was cut out, dried at 105 ° C. for 24 hours, and then cooled to room temperature. W (g) and volume V
The apparent density ρ ₁ = W / V is obtained from (cm ³ ), and the apparent density ρ ₂ obtained by the Archimedes method for the similarly treated test piece is obtained by the following equation. Porosity (%) = (1-ρ ₁ / ρ ₂ ) × 100 Further, bending strength is JIS A1106, compressive strength is JIS R2206, and water permeability is JIS A12.
18 is calculated according to each. On the other hand, as a sizing agent,
Organic sizing agents such as carboxymethyl cellulose (CMC) and starch, and inorganic sizing agents such as water glass can be used. The organic paste is used as an aqueous solution. The amount of the sizing agent is determined in consideration of the shape-retaining property at the time of subsequent molding and the handling property of the molded product at the time of firing.
About 5 to 20 parts by weight is added to 00 parts by weight. Further, as the binder, powder of clay, natural stone, glass or the like having a melting point lower than that of the aggregate can be used. As the natural stone, sandstone, slate, granite, etc. can be used. The thermal expansion coefficient of the binder is preferably equal to or higher than that of the aggregate in order to reduce the strain generated in the aggregate and the binder during firing. The binder melts and bonds the aggregates during firing, but the maximum particle size of the binder is that the binding of the aggregates is performed uniformly, and it takes time to melt during firing, which increases energy costs. Not to
It is preferably 0.1 mm or less. Also, the amount of binder is determined in consideration of the strength of the block, water permeability, etc.
Usually, about 3 to 15 parts by weight is added to 100 parts by weight of aggregate. By the way, the base layer material is first mixed with the inorganic aggregate by adding a liquefied sizing agent little by little in a shower, for example. Next, the binder is added little by little to the mixture of the inorganic aggregate and the sizing agent and mixed. Here, the inorganic aggregate and the sizing agent are mixed in advance, and the binder is further added to and mixed with the mixture because the sizing agent and the aggregate and the binder are easily aggregated when these three components are mixed at the same time. This is because the agglomerated sizing agent adheres to the mold during molding and foams during firing, resulting in a decrease in yield. Surface layer material preparation step: The surface layer material is also prepared in the same manner as the base layer material. However, as an inorganic aggregate, the water absorption rate is 0.5%
At least one of the following crushed pieces of steel slag, natural stone, and porcelain is used. The water absorption rate is determined according to JIS A1109. As the porcelain, waste materials such as porcelain tiles and power insulators can be used. The aggregate having a water absorption rate of 0.5% or less is used because a material having a water absorption rate of more than 0.5% is likely to stain the surface and is difficult to wash by washing with water. Further, it is easy to wear, the appearance is deteriorated, and the aggregate powder generated by the wear is present on the surface of the surface layer and becomes slippery regardless of whether it is wet. This tendency becomes particularly remarkable when the Mohs hardness of the surface of the surface layer measured by Mohs' hardness meter is less than 6. The size of the crushed pieces is within the range of 2.8 mm or less in maximum dimension and 0.5 to 2 mm in average particle diameter. The aggregate of the surface layer is smaller than that of the base layer in both the maximum size and the average particle size. When the maximum size of the crushed pieces is larger than 2.8 mm, the slip resistance value of the surface layer when wet becomes small, and the crushed pieces become slippery when wet such as during rainfall. In other words, the maximum size of the crushed pieces is one of the conditions necessary for making the slip resistance value when the surface of the surface layer wet when it is 40 or more. The slip resistance value is determined according to ASTM E303. Also, the porosity of the surface layer has a great influence on the permeability coefficient of the whole block, but if it is within the range of 25 to 50%, rainwater etc. is positively flowed but clogging components such as earth and sand enter. Can be suppressed. To color the surface layer, pigments can be added to it when preparing the surface layer material. As the pigment, powders of iron oxide, titanium oxide, cobalt oxide and the like can be used, and are usually added and mixed with the aggregate. Although the amount of the pigment depends on the degree of color development and the like, about 0.2 to 10 parts by weight is added to 100 parts by weight of the aggregate. Molding process: Molding is performed by first filling the base material with a mold so that the surface layer and the base layer have a desired thickness after firing, while considering the filling thickness, and then 0.5 to 50 kgf.
After pressurizing at a pressure within the range of / cm ² to perform primary molding, the surface layer material is filled thereon and 0.5 to 50 kgf / c again.
Pressurize at a pressure within the range of m ² . At this time, the filling thickness of the surface layer material is such that the surface layer thickness of the block is in the range of 4 to 15 mm.
It is preferable to set it within . This is because if the filling thickness is less than 4 mm, the base layer material may project from the surface layer material at the time of pressurization, resulting in a poor yield and unfavorable aesthetics of the surface layer. The deterioration of the aesthetic appearance becomes particularly remarkable when a pigment is added to the surface layer material. Further, if the thickness is such that it exceeds 14 mm, the water permeability will decrease. In addition, from the viewpoint of production, when the pigment is added, the amount used is increased, cracks are generated during subsequent firing, or shrinkage is increased, which lowers the yield. A vibrating press, a hydraulic press, a friction press, or the like can be used for molding, but it is preferable to use the vibrating press particularly when the pressure is low. In addition, the preferable range of the molding pressure is 0.5 to 50.
The reason why the pressure is set to kgf / cm ² is that if it is too low, molding cannot be performed, and if it is too high, the aggregate is damaged. Firing step: In this step, the molded body obtained in the above-mentioned molding step is fired to obtain a water-permeable block. Prior to firing, the molded body is dried, or when water glass is used as a sizing agent, carbon dioxide gas is caused to act to primarily cure the water glass to facilitate handling. A tunnel kiln, a roller hearth kiln, or the like can be used for firing. Firing temperature is determined in consideration of heat resistance of aggregate, typically in the range of 900~1,300 ℃. The firing time depends on the types of the base layer material and the surface layer material, the size of the molded body, and the like, so it cannot be generally stated, but 2 to 7
It takes about 2 hours. Construction of road structures: Construction of road structures using the blocks obtained as described above first forms a subbase using gravel, steel slag, etc., and consists of polyester fiber etc. on the subbase. Lay a non-woven cloth,
Furthermore, a sand cushion layer using sand with a maximum dimension of 4.75 mm or less is provided on the non-woven fabric, and blocks are laid on the sand cushion layer in a matrix or zigzag pattern. After the sand is sprayed to form a sand joint, the block is fixed by rolling while applying vibration. The non-woven fabric is used to prevent the sand in the sand cushion layer from flowing out into the roadbed due to rainwater flowing down in the block. FIG. 3 shows a road structure constructed in this way. In FIG. 3, 4 is a block, 5 is a sand joint, 6 is a sand cushion layer, 7 is a nonwoven fabric, and 8 is a roadbed. When constructing a road structure such as a road on which a vehicle enters, a load bearing layer is provided between the nonwoven fabric 7 and the roadbed 8. This load bearing layer has a water permeability of 1 × 10 ^-2 cm / s.
It can be provided as an open-grain size asphalt concrete layer having a thickness of ec or more, a water-permeable concrete layer, or a concrete layer having a drain hole with a diameter of about 50 mm.

【実施例】吸水率が０．２％の磁器タイル廃材の破砕片
（最大寸法：３．３５ｍｍ、平均粒径：１．９ｍｍ）を
骨材とし、これに糊剤として水ガラス３号を骨材１００
重量部に対して８重量部になるように添加、混合し、得
られた混合物にバインダとして板ガラス廃材の粉末（最
大寸法：０．１ｍｍ）を添加、混合し、基層材料を得
た。一方、磁器タイル廃材の破砕片（最大寸法：１．１
８ｍｍ、平均粒径：０．７ｍｍ）を骨材とし、これに酸
化鉄系顔料を骨材１００重量部に対して２重量部になる
ように添加、混合し、さらに糊剤として水ガラス３号を
骨材１００重量部に対して８重量部になるように添加、
混合し、得られた混合物にバインダとして板ガラス廃材
の粉末（最大寸法：０．１ｍｍ）を添加、混合し、表層
材料を得た。次に、上記基層材料を厚みが５５ｍｍにな
るように型に入れ、振動プレスを用いて１ｋｇｆ／ｃｍ
²の圧力で一次成型した後、その上に、上記表層材料を
厚みが１５ｍｍになるように入れ、再び１ｋｇｆ／ｃｍ
²の圧力で加圧して成型した。次に、成型体に炭酸ガス
を作用させて糊剤である水ガラス３号を一次硬化させた
後、トンネルキルンを用い、１，１００℃で４８時間焼
成し、大きさが１００×２００ｍｍ、表層の厚みが１２
ｍｍ、基層の厚みが４８ｍｍ、全体厚みが６０ｍｍの、
この発明のブロックを得た。表層の表面の周縁には、３
Ｃの面取りが付与されている。収率は９７％であった。
このようにして得たブロックについて、特性を評価した
ところ、以下のとおりであった。なお、数値は１０個の
ブロックについての平均値である。空隙率：表層３７％、基層２５％透水係数：１．８×１０^-1ｃｍ／ｓｅｃ曲げ強度：６２．３ｋｇｆ／ｃｍ² 圧縮強度：２７２ｋｇｆ／ｃｍ² 表層表面のモース硬度：７湿潤時における滑り抵抗値：５２上記ブロックを用い、都市における歩道を施工した。す
なわち、ＪＩＳＡ５００１の粒度調整砕石（Ｍ−３
０）からなる厚みが１５０ｍｍの路盤の上に、厚みが１
ｍｍのポリエステル繊維の不織布を敷き、その不織布の
上に、最大寸法が４．７５ｍｍの粗目川砂からなる厚み
２０ｍｍのサンドクッション層を設け、そのサンドクッ
ション層の上に上記ブロックを千鳥状に敷き詰めた後、
ブロック間に硅砂４号による砂目地を形成して歩道を施
工した。施工時に欠けや割れ等を生ずることはなかっ
た。また、供用開始１年後における透水係数は１．２×
１０^-1ｃｍ／ｓｅｃで透水機能の低下は小さく、しか
も、破損や表層の表面の摩耗等は認められなかった。Example: A crushed piece of a porcelain tile waste material having a water absorption rate of 0.2% (maximum size: 3.35 mm, average particle size: 1.9 mm) was used as an aggregate, and water glass No. 3 was used as a sizing agent. Material 100
The mixture was added and mixed in an amount of 8 parts by weight with respect to parts by weight, and powder of a plate glass waste material (maximum size: 0.1 mm) was added and mixed as a binder to the obtained mixture to obtain a base layer material. On the other hand, crushed pieces of porcelain tile waste material (maximum size: 1.1
8 mm, average particle diameter: 0.7 mm) is used as an aggregate, and iron oxide pigment is added to and mixed with the aggregate in an amount of 2 parts by weight per 100 parts by weight of the aggregate, and water glass No. 3 is used as a sizing agent. Is added to 8 parts by weight with respect to 100 parts by weight of aggregate,
The mixture was mixed, and powder of a plate glass waste material (maximum size: 0.1 mm) was added as a binder to the obtained mixture and mixed to obtain a surface layer material. Next, the above base layer material was put into a mold so that the thickness was 55 mm, and 1 kgf / cm was applied using a vibration press.
After primary molding at a pressure of ² , put the above surface layer material on it to a thickness of 15 mm, and again 1 kgf / cm
^It was pressed at a pressure of ² and molded. Next, carbon dioxide gas is caused to act on the molded body to primarily cure water glass No. 3, which is a sizing agent, and then it is fired at 1,100 ° C. for 48 hours using a tunnel kiln to measure 100 × 200 mm in size and surface layer. Thickness is 12
mm, the thickness of the base layer is 48 mm, the total thickness is 60 mm,
The block of this invention was obtained. 3 on the edge of the surface
C chamfer is added. The yield was 97%.
The characteristics of the block thus obtained were evaluated and the results were as follows. The numerical value is an average value for 10 blocks. Porosity: 37% of surface layer, 25% of base layer Water permeability: 1.8 × 10 ^-1 cm / sec Bending strength: 62.3 kgf / cm ² Compressive strength: 272 kgf / cm ² Mohs hardness of surface layer: 7 Slip when wet Resistance value: 52 A sidewalk in the city was constructed using the above block. That is, a crushed stone according to JIS A5001 (M-3
0) on a roadbed with a thickness of 150 mm and a thickness of 1
mm non-woven fabric of polyester fiber was laid, and a sand cushion layer having a maximum size of 4.75 mm and made of coarse river sand with a thickness of 20 mm was provided on the non-woven fabric, and the blocks were staggered on the sand cushion layer. rear,
A sidewalk was constructed by forming a sand joint with silica sand No. 4 between the blocks. No chipping or cracking occurred during construction. In addition, the hydraulic conductivity is 1.2 × 1 year after starting operation.
At 10 ^-1 cm / sec, the decrease in water permeability was small, and no damage or abrasion of the surface of the surface layer was observed.

【発明の効果】この発明の道路構造物およびその施工方
法に用いられる透水性ブロックは、空隙率が２５〜５０
％の範囲内にある表層と、空隙率が１０％以上で、か
つ、上記表層よりも低い空隙率を有する基層との層状構
成を有し、かつ、透水係数が１×１０^-2ｃｍ／ｓｅｃ以
上のものである。そして、路盤上に不織布を敷き、その
不織布の上にサンドクッション層を設け、そのサンドク
ッション層の上に上述したブロックを敷き詰めた後、透
水性ブロック間に砂目地を形成するので、実施例にも示
したように、透水性や強度に優れているばかりか、長期
間使用しても目詰りの心配が少なく、透水機能の低下が
小さい、歩道や、公園その他の広場等の道路構造物を容
易に施工することができる。EFFECT OF THE INVENTION Road structure of the present invention and its construction method
The water-permeable block used in the method has a porosity of 25 to 50.
% And surface layer in the range of, in the porosity of 10% or more, and has a layered structure of the base layer having a lower porosity than the outer layer, and the permeability is 1 × 10 ^-2 cm / sec That is all . Their to, laid nonwoven fabric on roadbed, provided a sand cushion layer over the non-woven fabric, after paved blocks described above over the sand cushion layer, so forming a sand joint between water-permeable blocks, implemented Also shown in the example
As described above, not only is it excellent in water permeability and strength, but
Even if it is used for a while, there is little concern about clogging and deterioration of water permeability function.
It is possible to easily construct small road structures such as sidewalks, parks and other plazas.

[Brief description of drawings]

【図１】この発明で用いる透水性ブロックの概略平面図
である。FIG. 1 is a schematic plan view of a water permeable block used in the present invention.

【図２】この発明で用いる透水性ブロックの概略側面図
である。FIG. 2 is a schematic side view of a water permeable block used in the present invention.

【図３】この発明の一実施態様に係る道路構造物を示す
概略縦断面図である。FIG. 3 is a schematic vertical sectional view showing a road structure according to the embodiment of the present invention.

[Explanation of symbols]

１：表層２：基層３：目地幅規制用の突起４：透水性ブロック５：目地６：サンドクッション層７：不織布８：路盤 1: Surface 2: Base layer 3: Protrusion for joint width regulation 4: Water permeable block 5: Joint 6: Sand cushion layer 7: Non-woven fabric 8: Roadbed

───────────────────────────────────────────────────── フロントページの続き (56)参考文献特開昭64−24079（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continued front page (56) References Japanese Patent Laid-Open No. 64-24079 (JP, A)

Claims

(57) [Claims]

1. A non-woven fabric was laid on the roadbed, and the sand cushion layer formed on the nonwoven fabric, a breathable water blocks laid side by side on the sand cushion layer, adjacent to
And a sand joint formed between the water-permeable blocks , wherein the water-permeable blocks have a porosity of 25 to
With a surface layer in the range of 50% and a porosity of 10% or more,
And the layered structure with the base layer having a lower porosity than the surface layer
It has a structure and has a water permeability of 1 × 10 ^-2 cm / sec.
Road structures that are the above water-permeable blocks .

2. The water-permeable block has an inorganic surface layer and base layer.
Includes fine aggregate, and the surface aggregate has maximum size and average particle size.
Is smaller than the aggregate of the base layer and the flatness of the aggregate of the surface layer
The average particle size is within the range of 0.5 to 2 mm and the aggregate of the base layer is
The average particle size is in the range of 1.5 to 2.5 mm.
The road structure according to 1.

3. The water-permeable block has a bending strength of 30 kgf.
/ Cm ² or more and the compressive strength is 160 kgf / cm ²
The road structure according to claim 1 or 2, which is the above.

4. The surface layer of the water-permeable block has a Mohs hardness on the surface.
Degree of 6 or more, and the slip resistance value when wet is 40
The road structure according to any one of claims 1 to 3, which is the above.
object.

5. The water-permeable block has a total thickness of 40 to 10.
Within the range of 0 mm, the thickness of the surface layer is in the range of 4 to 15 mm.
The road structure according to any one of claims 1 to 4, which is in an enclosure.
object.

6. A chamfer is formed on the periphery of the surface of the water-permeable block.
Any of claims 1 to 5, which is provided with a rounded or rounded shape.
The road structure described in Crab.

7. The side surface of the water permeable block has a trapezoidal shape.
The road structure according to any one of claims 1 to 6.

8. A protrusion for regulating joint width on the side surface of the water permeable block.
A riser is provided, according to any one of claims 1 to 7.
Road structure.

Between 9. roadbed and the nonwoven fabric, load layer having water permeability is provided, in any one of claims 1 to 8 serial
Road structures of the mounting.

10. providing a load bearing layer having a water permeability on the roadbed,-out laying nonwoven on this load-bearing layer, on top of the nonwoven fabric
The sand cushion layer is provided on the
A surface layer having a porosity in the range of 25 to 50%,
Porosity with a porosity of 10% or more and lower than the surface layer
Has a layered structure with a base layer having a coefficient of permeability, and has a hydraulic conductivity
Lay out a water-permeable block that is 1 × 10 ^-2 cm / sec or more
After packing, form a sand joint between adjacent permeable blocks
A method of constructing a road structure , characterized by:

11. The water-permeable block has no surface layer or base layer.
Including surface aggregate, the surface aggregate has maximum size and average grain size.
Is smaller than the aggregate of the base layer and of the aggregate of the surface layer
The average particle size is in the range of 0.5 to 2 mm, and the aggregate of the base layer
The average particle size of is within the range of 1.5 to 2.5 mm.
Item 10. A construction method for a road structure according to item 10.

12. The water-permeable block has a bending strength of 30 kg.
f / cm ² or more and compressive strength of 160 kgf / c
The road structure according to claim 10 or 11, which is m ² or more.
Construction method of structure.

13. The surface layer of the water permeable block is a mohs surface.
Hardness of 6 or more, and slip resistance of 4 when wet
The road according to any one of claims 10 to 12, which is 0 or more.
Road structure.

14. The water-permeable block has an overall thickness of 40 to 1.
It is in the range of 00 mm, and the thickness of the surface layer is 4 to 15 mm.
The road according to any one of claims 10 to 13, which is within a range.
Road structure construction method.

15. A surface at the periphery of the surface of the water permeable block.
Claim 10 or 14, which is provided with a rounded or rounded shape.
The method for constructing a road structure according to any one.

16. The water-permeable block has a trapezoidal side shape.
The road structure according to any one of claims 10 to 15.
Construction method.

17. A side wall of a water-permeable block for controlling joint width.
In any one of Claims 10-16 provided with the protrusion.
Construction method of the road structure described.