JP3091416B2 - Road backfill material - Google Patents
Road backfill materialInfo
- Publication number
- JP3091416B2 JP3091416B2 JP24604796A JP24604796A JP3091416B2 JP 3091416 B2 JP3091416 B2 JP 3091416B2 JP 24604796 A JP24604796 A JP 24604796A JP 24604796 A JP24604796 A JP 24604796A JP 3091416 B2 JP3091416 B2 JP 3091416B2
- Authority
- JP
- Japan
- Prior art keywords
- soil
- cbr value
- mixed
- excavated soil
- road
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Road Paving Structures (AREA)
- Processing Of Solid Wastes (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、土木工事で発生し
た掘削土を原料土とする道路用埋め戻し材に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backfill material for roads using excavated soil generated during civil engineering as raw material soil.
【０００２】[0002]
【従来の技術】道路工事等の土木工事の際には、大量の
掘削土が発生する。これをそのまま道路用埋め戻し材に
使用することができれば理想的であるが、道路用埋め戻
し材には路盤材の支持力を示すＣＢＲ値が２０％以上で
なければならないとの規格があり、掘削土の種類によっ
ては道路用埋め戻し材に使用することができないことが
ある。特に、掘削土が日本統一土質分類のＳＣに分類さ
れる粘土混じりの砂質土であるような場合には、掘削土
単体のＣＢＲ値がわずかに２％未満であるため、そのま
ま埋め戻すことはできない。2. Description of the Related Art A large amount of excavated soil is generated during civil engineering work such as road construction. Ideally, this can be used as it is for road backfill materials, but there is a standard that road backfill materials must have a CBR value of 20% or more, which indicates the supporting force of the roadbed material. Some types of excavated soil cannot be used as road backfill. In particular, when the excavated soil is a sandy soil mixed with clay classified in the SC of the Japan Unified Soil Classification, the CBR value of the excavated soil alone is slightly less than 2%. Can not.
【０００３】そこでこのような場合には、掘削土に生石
灰やセメントを添加することにより化学的に土質改良を
加えたうえで埋め戻す方法が行われているが、この場合
には路盤が所定の強度に達するまでの養生にかなりの時
間を要し、長期間にわたり交通を遮断しておかねばなら
ないという問題があった。[0003] In such a case, a method of chemically refining the excavated soil by adding quicklime or cement to the soil and then backfilling the excavated soil has been performed. There is a problem that it takes a considerable time for curing to reach the strength, and that traffic must be shut off for a long time.
【０００４】また掘削土に砂利等の天然骨材を混合して
ＣＢＲ値を高めることも考えられるが、掘削土が上記し
た粘土混じりの砂質土である場合には、粘土が吸水膨潤
するために強度が出にくく、ＣＢＲ値を規格を満足する
２０％以上にまで高めることは困難であった。It is conceivable to increase the CBR value by mixing excavated soil with natural aggregates such as gravel. However, when the excavated soil is the above-mentioned sandy soil mixed with clay, the clay absorbs and swells. However, it was difficult to increase the CBR value to 20% or more that satisfies the standard.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決して、単体のＣＢＲ値が低い掘削土を原
料土とするにもかかわらず、規格を越える優れたＣＢＲ
値を持つ道路用埋め戻し材を提供するためになされたも
のである。また本発明の他の目的は、養生時間を必要と
せず締め固め施工後に直ちに所定の強度を発揮できる道
路用埋め戻し材を提供することである。さらに本発明の
その他の目的は、下水処理場から生ずる廃棄物を活用す
ることにより、経済的に掘削土のＣＢＲ値を高めること
ができる道路用埋め戻し材を提供することである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides an excellent CBR exceeding the standard even though excavated soil having a low CBR value is used as a raw material soil.
This was done to provide road backfill with value. Another object of the present invention is to provide a backfill material for roads which can exhibit a predetermined strength immediately after compaction without requiring a curing time. Still another object of the present invention is to provide a road backfill that can economically increase the CBR value of excavated soil by utilizing waste generated from a sewage treatment plant.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明の道路用埋め戻し材は、単体では支
持力が得られない日本統一土質分類のＳＣに分類される
粘土混じりの砂質土である掘削土に対して、下水汚泥焼
却灰の造粒焼結骨材を乾燥重量比で２０〜８０％混合
し、ＣＢＲ値を４０％以上としたことを特徴とするもの
である。ここで掘削土としては、日本統一土質分類のＳ
Ｃに分類される粘土混じりの砂質土であり、それ単体の
ＣＢＲ値が２％未満であるようなものを用いることがで
きる。それにもかかわらず、本発明によればＣＢＲ値が
４０％以上の道路用埋め戻し材を得ることができる。The road backfill material according to the present invention, which has been made to solve the above-mentioned problems, is classified as SC in the Japan Unified Soil Classification, which cannot provide a supporting force by itself.
The excavated soil, which is a sandy soil mixed with clay, is mixed with a granulated and sintered aggregate of sewage sludge incineration ash in a dry weight ratio of 20 to 80% to have a CBR value of 40% or more. Things. Here, the excavated soil is S
Sandy soil mixed with clay classified as C and having a CBR value of less than 2% can be used. Nevertheless, according to the present invention, a road backfill having a CBR value of 40% or more can be obtained.
【０００７】[0007]
【発明の実施の形態】以下に本発明の好ましい実施の形
態を示す。本発明において原料土とされる掘削土は、土
木工事で発生した掘削土のうちそれ単体では道路用埋め
戻し材の規格（ＣＢＲ値が２０％以上）を満足する支持
力が得られないものであり、その代表例としては３０〜
７０％の粘土分を含む粘土混じりの砂質土（ＳＣ）を挙
げることができる。このように多くの粘土分を含む掘削
土は吸水膨潤するために強度が出にくく、それ単体のＣ
ＢＲ値が２％未満ときわめて支持力の低いものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. The excavated soil used as the raw material soil in the present invention is excavated soil generated in civil engineering work that does not have a bearing capacity that satisfies the standard of road backfill material (CBR value is 20% or more) by itself. There are 30-
Clay-mixed sandy soil (SC) containing 70% clay can be mentioned. Excavated soil containing a large amount of clay in this way hardly comes out with strength due to water absorption and swelling.
When the BR value is less than 2%, the support is extremely low.
【０００８】本発明では、このような単体では支持力が
得られない掘削土に、下水汚泥焼却灰の造粒焼結骨材を
混合する。下水汚泥焼却灰の造粒焼結骨材は、下水処理
場で発生した下水汚泥の焼却灰を添加していない。造粒
したうえで１０００℃以上の高温で焼結した多孔質体で
ある。その平均粒径は２〜５mm程度が好ましい。このよ
うな造粒焼結骨材は、それ単体ではやはり締め固まりに
くい材質であり、ＣＢＲ値を測定すると４〜１３％程度
に過ぎない。[0008] In the present invention, the excavated soil that cannot provide a supporting force by itself is mixed with granulated sintered aggregate of sewage sludge incineration ash. The granulated sintered aggregate of the sewage sludge incineration ash does not include the sewage sludge incineration ash generated in the sewage treatment plant. It is a porous body that has been granulated and sintered at a high temperature of 1000 ° C. or higher. The average particle size is preferably about 2 to 5 mm. Such a granulated sintered aggregate is a material that is hard to be compacted by itself, and its CBR value is only about 4 to 13% when measured.
【０００９】ところが上記のように単体ではＣＢＲ値の
低い掘削土と造粒焼結骨材とを混合すると、ＣＢＲ値が
飛躍的に向上した道路用埋め戻し材となる。その主な理
由は、造粒焼結骨材が５〜２０％程度の吸水率を持ち、
これを粘土分を含む掘削土に対して乾燥重量比で２０〜
８０％混合することにより含水率が低下し、締め固め特
性が向上することである。また粒度組成が改善されるこ
ともＣＢＲ値が向上する理由と考えられる。However, when the excavated soil having a low CBR value and the granulated sintered aggregate are mixed with each other as described above, a backfill material for roads having a significantly improved CBR value can be obtained. The main reason is that the granulated sintered aggregate has a water absorption of about 5 to 20%,
The dry weight ratio of this to the excavated soil containing clay is 20-
By mixing 80%, the water content is reduced, and the compaction characteristics are improved. It is also considered that the improvement in the particle size composition is the reason why the CBR value is improved.
【００１０】なお、造粒焼結骨材の混合比が２０％未満
であると十分なＣＢＲ値の向上効果が認められず、逆に
８０％を越えて混合すると造粒焼結骨材自体のもつ締め
固め特性の悪さが表面化するので、造粒焼結骨材の混合
比は２０〜８０％の範囲内、特に好ましくは４０〜６０
％の範囲内とする。以下に本発明の実施例を示す。[0010] If the mixing ratio of the granulated sintered aggregate is less than 20%, a sufficient effect of improving the CBR value is not recognized. The mixing ratio of the granulated and sintered aggregates is in the range of 20 to 80%, particularly preferably 40 to 60, since the poor compaction characteristics of the granules surface.
%. Hereinafter, examples of the present invention will be described.
【００１１】[0011]
【実施例】ある市内の道路工事により発生した掘削土
は、日本統一土質分類のＳＣに分類される粘土混じりの
砂質土であり、含水比２６％、ＣＢＲ値１．２％の単体
では支持力が得られない要改良土であった。その粒度曲
線を図１に○で示した。一方、下水処理場で発生した下
水汚泥の焼却灰を造粒し焼結して造粒焼結骨材を製造し
た。この造粒焼結骨材は嵩比重約２．１、吸水率約１１
％、ＣＢＲ値４〜１３％、９５％修正ＣＢＲ値４．５の
特性を持ち、その粒度曲線は図１に●で示した通りであ
る。この粒度曲線に示されるように、この造粒焼結骨材
は細礫分８２．３６〜４．７５mm）が全体の９５％以上
で均等係数が３以下の単粒度を呈しており、土質的には
粒度の悪い礫に分類されるものである。[EXAMPLE] Excavated soil generated by road construction in a certain city is a sandy soil mixed with clay classified as SC of the Japan Unified Soil Classification, and it has a water content of 26% and a CBR value of 1.2% alone. The soil needed to be improved without sufficient bearing capacity. The particle size curve is shown by a circle in FIG. On the other hand, incinerated ash of sewage sludge generated in a sewage treatment plant was granulated and sintered to produce granulated sintered aggregate. This granulated sintered aggregate has a bulk specific gravity of about 2.1 and a water absorption of about 11
%, A CBR value of 4 to 13%, and a 95% corrected CBR value of 4.5, and the particle size curve is as shown by ● in FIG. As shown in this particle size curve, the granulated sintered aggregate has a single particle size of more than 95% of the total fine particles (82.36 to 4.75 mm) and an equality coefficient of 3 or less. Are classified as gravels of poor grain size.
【００１２】この掘削土に対して造粒焼結骨材を乾燥重
量比で５０％混合し、得られた混合土（本発明の道路用
埋め戻し材）につき、含水量試験（JIS A 1203)、粒度
分布試験（JIS A 1204) 、ＣＢＲ試験（JIS A 1211) を
行った。その結果ＣＢＲ値は４０％以上となり、得られ
た粒度曲線を図１に＊で示した。更に原料土である掘削
土と、造粒焼結骨材を混合した混合土について、荷重−
嵌入量曲線を図２に示した。The excavated soil is mixed with granulated sintered aggregate in a dry weight ratio of 50%, and the obtained mixed soil (the backfill material for roads of the present invention) is subjected to a water content test (JIS A 1203). And a particle size distribution test (JIS A 1204) and a CBR test (JIS A 1211). As a result, the CBR value is over 40%,
The resulting particle size curve is indicated by * in FIG. In addition, the excavated soil, which is the raw material soil, and the mixed soil obtained by mixing the granulated sintered aggregate,
FIG. 2 shows the fitting amount curve.
【００１３】この試験結果から明らかなように、原料土
である掘削土も造粒焼結骨材もともにそれ自体ではＣＢ
Ｒ値の低い材料であるが、両者を混合することによりＣ
ＢＲ値を飛躍的に向上させることができる。As is apparent from the test results, both the excavated soil as the raw material soil and the granulated sintered aggregate are themselves CB.
It is a material with a low R value, but by mixing both, C
The BR value can be dramatically improved.
【００１４】[0014]
【発明の効果】以上に説明したように、本発明によれば
単体ではＣＢＲ値の低い材料どうしを混合することによ
りＣＢＲ値を４０％以上となるまで飛躍的に向上させた
道路用埋め戻し材を得ることができる。また本発明の道
路用埋め戻し材は生石灰やセメントを添加する化学的な
土質改良法とは異なり、養生時間を必要とせずに優れた
強度を発揮できるので、長期間にわたり交通を遮断する
必要がない。さらに本発明の道路用埋め戻し材は廃棄物
を原料とした造粒焼結骨材を用いるため材料コストが安
価であるうえ、廃棄物の有効利用の観点からも好ましい
ものである。As described above, according to the present invention, a backfill material for roads in which a material having a low CBR value by itself is dramatically improved to a CBR value of 40% or more by mixing materials having a low CBR value. Can be obtained. Also, unlike the chemical soil improvement method of adding quicklime and cement, the road backfill material of the present invention can exhibit excellent strength without requiring curing time, so it is necessary to block traffic for a long period of time. Absent. Further, since the road backfill material of the present invention uses granulated sintered aggregates made of waste materials, the material cost is low and it is preferable from the viewpoint of effective use of waste materials.
【図１】実施例における粒度曲線図である。FIG. 1 is a particle size curve diagram in an example.
【図２】実施例における荷重−嵌入量曲線図である。FIG. 2 is a load-fit amount curve diagram in an example.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−24004（ＪＰ，Ａ) 特開 昭58−30380（ＪＰ，Ａ) 特開 昭58−30381（ＪＰ，Ａ) 特開 平10−60432（ＪＰ，Ａ) 特開 平７−941（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C09K 17/00 - 17/50 B09B 3/00 E01C 3/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-24004 (JP, A) JP-A-58-30380 (JP, A) JP-A-58-30381 (JP, A) 60432 (JP, A) JP-A-7-941 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C09K 17/00-17/50 B09B 3/00 E01C 3/00
Claims (1)
質分類のＳＣに分類される粘土混じりの砂質土である掘
削土に対して、下水汚泥焼却灰の造粒焼結骨材を乾燥重
量比で２０〜８０％混合し、ＣＢＲ値を４０％以上とし
たことを特徴とする道路用埋め戻し材。Claims 1. A unified Japanese soil that cannot support itself
Excavation which is a sandy soil mixed with clay classified as SC
Against Kezudo, granulated sintered aggregate of sewage sludge incinerator ash was mixed 20% to 80% by dry weight, the CBR value of 40% or more
Road for the backfill material, characterized in that was.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24604796A JP3091416B2 (en) | 1996-09-18 | 1996-09-18 | Road backfill material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24604796A JP3091416B2 (en) | 1996-09-18 | 1996-09-18 | Road backfill material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1088132A JPH1088132A (en) | 1998-04-07 |
| JP3091416B2 true JP3091416B2 (en) | 2000-09-25 |
Family
ID=17142683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24604796A Expired - Fee Related JP3091416B2 (en) | 1996-09-18 | 1996-09-18 | Road backfill material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3091416B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003024915A (en) * | 2001-07-19 | 2003-01-28 | Yokohama City | Filler using lime-based sewage sludge incineration ash and its selection method |
-
1996
- 1996-09-18 JP JP24604796A patent/JP3091416B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1088132A (en) | 1998-04-07 |
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