JPH10130645A - Soil improvement material for preventing liquefaction - Google Patents
Soil improvement material for preventing liquefactionInfo
- Publication number
- JPH10130645A JPH10130645A JP8287964A JP28796496A JPH10130645A JP H10130645 A JPH10130645 A JP H10130645A JP 8287964 A JP8287964 A JP 8287964A JP 28796496 A JP28796496 A JP 28796496A JP H10130645 A JPH10130645 A JP H10130645A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- improvement material
- ground
- liquefaction
- soil improvement
- 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.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 61
- 230000006872 improvement Effects 0.000 title claims abstract description 27
- 239000002689 soil Substances 0.000 title claims abstract description 21
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000002893 slag Substances 0.000 claims abstract description 38
- 239000000292 calcium oxide Substances 0.000 claims abstract description 28
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 27
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 10
- 235000019738 Limestone Nutrition 0.000 claims abstract description 5
- 239000006028 limestone Substances 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 13
- 239000010813 municipal solid waste Substances 0.000 claims description 13
- 239000010440 gypsum Substances 0.000 claims description 10
- 229910052602 gypsum Inorganic materials 0.000 claims description 10
- 238000010304 firing Methods 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims 1
- 230000002265 prevention Effects 0.000 claims 1
- 238000010298 pulverizing process Methods 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 14
- 239000002699 waste material Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 238000002156 mixing Methods 0.000 abstract description 4
- 239000011362 coarse particle Substances 0.000 abstract description 2
- 238000010791 quenching Methods 0.000 abstract description 2
- 230000000171 quenching effect Effects 0.000 abstract description 2
- 239000000155 melt Substances 0.000 abstract 1
- 239000011435 rock Substances 0.000 abstract 1
- 229920006395 saturated elastomer Polymers 0.000 description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 7
- 235000011941 Tilia x europaea Nutrition 0.000 description 7
- 239000004571 lime Substances 0.000 description 7
- 239000004575 stone Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 5
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 235000011116 calcium hydroxide Nutrition 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- 239000003673 groundwater Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 4
- 238000013329 compounding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- -1 In addition Substances 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 235000014443 Pyrus communis Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- APAWRDGVSNYWSL-UHFFFAOYSA-N arsenic cadmium Chemical compound [As].[Cd] APAWRDGVSNYWSL-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Landscapes
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液状化防止用地盤
改良材に関するものであり、特に、都市ごみ等の焼却灰
を再溶融して得られたスラグを利用する液状化防止用地
盤改良材に関するものである。The present invention relates to a soil improvement material for preventing liquefaction, and more particularly to a soil improvement material for preventing liquefaction using slag obtained by remelting incinerated ash such as municipal waste. It is about.
【０００２】[0002]
【従来の技術】従来から、地下水位が高く緩い砂質土地
盤を締め固めるために、生石灰、砂、砕石、石膏、水滓
等の反応による吸水と膨張、圧縮による硬化作用によっ
て、地盤を改良するいわゆる生石灰杭工法が知られてい
る。しかしながら、この工法は地下水の豊富な透水性の
砂質土地盤の場合は、生石灰の水和反応が瞬間的に起こ
り、杭周辺地盤を圧縮する残余の圧力が小さく、充分な
締固めができない。その理由は、生石灰が石灰石を比較
的低温で焼成して得られる軽焼生石灰であって、かつ粒
径が小さいものを用いるからである。2. Description of the Related Art Conventionally, in order to compact a loose sandy ground with a high groundwater level, the ground has been improved by a hardening action by water absorption, expansion, and compression by reactions of quick lime, sand, crushed stone, gypsum, scum, and the like. The so-called quick lime pile construction method is known. However, in this method, in the case of a permeable sandy ground with abundant groundwater, the hydration reaction of quicklime occurs instantaneously, and the residual pressure for compressing the ground around the pile is small, and sufficient compaction cannot be performed. The reason is that quicklime is light burnt quicklime obtained by calcining limestone at a relatively low temperature and having a small particle size.
【０００３】そこで本発明者らは、硬焼生石灰を使用す
る方法を開発し、特開平4-83012号を提案した。即ち、
石灰石を1,200〜1,500℃の高温で焼成した硬焼生石灰で
あって、比較的粗い粒子のものを用いると、含水状態の
砂と混合した際に、その生石灰の水和速度が遅く、１０
〜１５分間は生石灰のまま存在する。従って、混合材料
が地中に杭状に押し込まれた後に徐々に水和反応が起こ
るので、生石灰が消石灰に変化することによる膨張、締
固めの作用が有効に働くのである。Accordingly, the present inventors have developed a method using hard-burned quick lime, and have proposed JP-A-4-83012. That is,
The use of hard-burned quicklime obtained by firing limestone at a high temperature of 1,200 to 1,500 ° C. and having relatively coarse particles causes a slow hydration rate of the quicklime when mixed with wet sand.
It remains as quicklime for ~ 15 minutes. Therefore, since the hydration reaction gradually occurs after the mixed material is pushed into the ground in a pile shape, the action of expansion and compaction due to the change of quicklime into slaked lime works effectively.
【０００４】つまり、生石灰は地中で消石灰となり、地
盤中の砂粒子間によく充填し、砂に付着している粘土の
表面の負電荷がカルシウムイオンによって置換され、粘
土粒子の凝集がおこるので地盤改良の効果を奏すること
ができ、地下水位の高い緩い砂質土地盤で有効な方法と
なるのである。さらに、特開平4-83012号の方法では、
高炉水滓や石膏を併用することにより、消石灰の活力に
よりポゾラン反応がおこり、水硬性化合物が生成し、地
盤の硬化と改質ができるのである。In other words, quicklime becomes slaked lime in the ground and fills well between the sand particles in the ground, and the negative charge on the surface of the clay adhering to the sand is replaced by calcium ions, causing aggregation of the clay particles. The effect of ground improvement can be achieved, and it is an effective method for loose sandy ground with high groundwater level. Furthermore, in the method of JP-A-4-83012,
By using blast furnace slag and gypsum together, the pozzolanic reaction occurs due to the activity of slaked lime, a hydraulic compound is generated, and the ground can be hardened and modified.
【０００５】一方、都市ごみ等は、廃棄物としてその処
分に問題があるが、従来は、焼却灰を利用してブロック
を製造したり、道路用、肥料等の用途に使用されている
が、環境汚染の問題があるために、僅かしか使用され
ず、大部分は埋め立てや投棄処分されているのが現状で
ある。そして近時は、埋め立て地の確保が困難になって
いる。On the other hand, municipal solid waste has a problem in its disposal as waste. Conventionally, blocks are manufactured using incinerated ash or used for roads and fertilizers. Due to the problem of environmental pollution, they are used little and most are landfilled or dumped. Recently, it has become difficult to secure landfills.
【０００６】[0006]
【発明が解決しようとする課題】本発明者らは、液状化
防止用地盤改良材に関する種々の問題を考究すると共
に、都市ごみ等の焼却灰の利用や処分に関する問題を検
討した。そして、杭状に打設して地盤を改良する場合の
材料として用いる砂、砕石等の透水性材料や、水滓のよ
うな硬化材の代替材料の開発が求められ、かつ都市ごみ
等の廃棄物の再利用が重要な課題であることに着目し
た。DISCLOSURE OF THE INVENTION The present inventors have studied various problems relating to the ground improvement material for preventing liquefaction, and also studied problems relating to the use and disposal of incinerated ash such as municipal waste. Development of alternative materials for permeable materials, such as sand and crushed stone, and hardened materials, such as water slag, which are used as materials for improving the ground by driving into piles, and the disposal of municipal waste We focused on the importance of reusing materials.
【０００７】即ち、本発明は、上記の課題に鑑みてなさ
れたものであり、都市ごみ等の廃棄物の再利用を図り、
液状化防止用の地盤改良材として用いる砂、砕石等の透
水性材料や水滓の代替材料を提供せんとするものであ
る。[0007] That is, the present invention has been made in view of the above-mentioned problems, and aims at reusing waste such as municipal waste.
It is an object of the present invention to provide a substitute material for a water-permeable material such as sand or crushed stone used as a ground improvement material for preventing liquefaction or a scum.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、上記の課
題を解決するために鋭意研究を重ねた結果、都市ごみの
焼却灰を溶融して得られたスラグが、液状化防止用の地
盤改良材として用いる砂、砕石等の透水性材料や水滓の
代替材料として利用可能なことを見出した。Means for Solving the Problems The present inventors have conducted intensive studies to solve the above problems, and as a result, slag obtained by melting incinerated ash of municipal solid waste is used for preventing liquefaction. It has been found that it can be used as a substitute for a water-permeable material such as sand or crushed stone used as a ground improvement material or a slag.
【０００９】本発明は、上記の知見に基づくものであっ
て、その課題を達成する具体的な手段として、(1)都市
ごみの焼却灰を溶融して得られたスラグと、硬焼生石灰
と、セメントとの混合物からなる液状化防止用地盤改良
材としたものである。The present invention is based on the above findings, and as specific means for achieving the object, (1) slag obtained by melting incinerated ash of municipal solid waste, hard burnt lime, , A liquefaction-preventing ground improvement material comprising a mixture with cement.
【００１０】また本発明は、(2)都市ごみの焼却灰を溶
融して得られたスラグと、硬焼生石灰と、セメントと、
透水性材料との混合物からなる液状化防止用地盤改良
材、(3)都市ごみの焼却灰を溶融して得られたスラグ
と、硬焼生石灰と、石膏と、透水性材料との混合物から
なる液状化防止用地盤改良材としても前記の課題を達成
することができる。The present invention also provides (2) slag obtained by melting incinerated ash of municipal solid waste, hard-burnt quick lime, cement,
A liquefaction-preventing ground improvement material consisting of a mixture with a water-permeable material, (3) a slag obtained by melting incinerated ash of municipal waste, hard-burnt lime, gypsum, and a mixture of a water-permeable material The above object can also be achieved as a liquefaction-preventing ground improvement material.
【００１１】本発明に係る地盤改良材は、特に、地下水
位の高い緩い砂質土地盤で液状化の危険性が高い場合や
支持力不足な地盤の改良に有効な地盤改良材である。そ
して、その使用に当たっては、地盤中に杭状に打設して
用いることが好ましい。The ground improvement material according to the present invention is a ground improvement material that is particularly effective in the case of a loose sandy ground with a high groundwater level and a high danger of liquefaction, or in the improvement of a ground with insufficient supporting capacity. In using the same, it is preferable to use it by driving it into a pile in the ground.
【００１２】本発明において使用する都市ごみの焼却灰
を溶融して得られたスラグは、都市ごみの焼却灰を、竪
型炉又は電気炉等により溶融し、この溶融スラグを水に
より急冷するか、空気により徐冷して得られるスラグ
（以下「灰スラグ」という）である。実際に使用する灰
スラグの粒径は、２.５ｍｍ以下に調製したものが望ま
しが、混合材料としての経済性を考慮すれば、２.５ｍ
ｍ以上のものが多少含まれている有姿の状態の灰スラグ
を使用しても問題がない。そして、有姿のものを使用し
た場合は、予め杭状に打ち込まれたケーシング内の材料
が抜け易くなるという利点がある。なお、都市ごみの焼
却灰は、溶融することにより、その嵩が１０分の１程度
に減少するので、廃棄物の利用と処分の両面において好
都合である。The slag obtained by melting the incineration ash of municipal solid waste used in the present invention is obtained by melting the incinerated ash of municipal solid waste in a vertical furnace or an electric furnace or the like, and rapidly cooling the molten slag with water. Slag obtained by slow cooling with air (hereinafter referred to as “ash slag”). The particle size of the ash slag actually used is desirably adjusted to 2.5 mm or less, but in consideration of the economics of the mixed material, it is 2.5 m.
There is no problem with using ash slag in a tangible state, which contains a little more than m. And when using a real thing, there is an advantage that the material in the casing previously driven into a pile shape is easy to come off. The incinerated ash of municipal solid waste is melted, and its bulk is reduced to about one tenth, which is advantageous in both use and disposal of waste.
【００１３】次に、本発明で使用する硬焼生石灰は、粒
径が２０〜４０ｍｍ程度の石灰石原石を、石灰焼成炉を
用いて、約１,２００〜１,５００℃で焼成して得られる
ものであって、その粒径は２ｍｍ以上、好ましくは５ｍ
ｍ以上のものである。この硬焼生石灰は、含水状態の地
盤中の砂と接触する時、日本石灰協会参考試験方法の活
性度試験により判定すると、その生石灰の水和速度が遅
く、１０〜１５分間は生石灰のまま存在する。従って、
混合材料が地中に杭状に押し込まれた後に徐々に水和反
応が起こるので、生石灰が消石灰に変化することによる
膨張、締固めの作用が有効に働くのである。Next, the calcined quicklime used in the present invention is obtained by calcining rough limestone having a particle size of about 20 to 40 mm at about 1,200 to 1,500 ° C. in a lime calciner. Having a particle size of 2 mm or more, preferably 5 m or more.
m or more. This hard-burned quicklime has a slow hydration rate of quicklime when it comes into contact with sand in the hydrated ground, as determined by the activity test of the Japan Lime Association Reference Test Method, and remains as quicklime for 10 to 15 minutes. I do. Therefore,
The hydration reaction gradually occurs after the mixed material is pushed into the ground in a pile shape, so that the action of expansion and compaction due to the change of quicklime into slaked lime works effectively.
【００１４】さらに、本発明において使用するセメント
としては、高炉スラグと石膏との混合物、高炉スラグを
６０〜７０％含む高炉セメントＣ種や高炉スラグ８０〜
８５％、石膏１０〜１５％、ポルトランドセメント３〜
５％を含む高硫酸塩スラグセメントが好ましい。そし
て、混合材料の一つとして石膏を併用すれば、上記のセ
メントを混合する必要がない。即ち、硬焼生石灰の水和
反応により生じる消石灰の活力により、前記の灰スラグ
等とのポゾラン反応がおこり、水硬性化合物が生成し、
地盤を硬化させることができるからである。また、本発
明における透水性材料としては、山砂、川砂、砕石等の
材料を、必要に応じて適宜使用する。Further, the cement used in the present invention includes a mixture of blast furnace slag and gypsum, blast furnace cement C containing 60 to 70% blast furnace slag, and blast furnace slag 80 to 80%.
85%, gypsum 10-15%, Portland cement 3 ~
High sulfate slag cement containing 5% is preferred. If gypsum is used as one of the mixed materials, there is no need to mix the cement. That is, due to the vitality of slaked lime generated by the hydration reaction of hard-burnt quick lime, a pozzolan reaction with the ash slag and the like occurs, and a hydraulic compound is generated,
This is because the ground can be hardened. In addition, as the water-permeable material in the present invention, materials such as mountain sand, river sand, and crushed stone are appropriately used as needed.
【００１５】[0015]
【発明の実施の形態】次に、本発明の実施の形態を実施
例により説明する。本発明に係る地盤改良材について、
種々の配合からなるものを調製し、その配合からなる材
料で硬焼生石灰杭工法に使用するパイルを作成し、強度
等を測定して、適否を判定した。Next, embodiments of the present invention will be described with reference to examples. About the ground improvement material according to the present invention,
Materials having various compositions were prepared, and a pile for use in the hard-calcined lime pile method was prepared from the material having the compositions, and the strength and the like were measured to determine suitability.
【００１６】上記の測定に供した地盤改良材の配合例
（配合割合は重量％）を表１に示す。使用した配合材料
の灰スラグは、都市ごみの焼却灰を溶融し、急冷および
徐冷によって得られたスラグであって、０.１〜２.５ｍ
ｍに調製したもの、硬焼生石灰は、日本石灰協会法に基
づく試験法で塩酸滴定値１００ｃｃ（１０分値）のもの
で、粒径２〜１０ｍｍのもの、セメントは高炉スラグ粉
に石膏を３.４％添加したものを使用し、石膏としては
排煙脱硫石膏で粒径が０.０１〜０.３ｍｍのもの、透水
性材料としては、川砂を使用した。Table 1 shows examples of the ground improvement materials used in the above-mentioned measurements (the mixing ratio is% by weight). The ash slag of the used compounding material is slag obtained by melting incinerated ash of municipal solid waste, quenching and slow cooling, and is 0.1 to 2.5 m.
The calcined calcined lime was prepared by a test method based on the method of the Japan Lime Association, and had a hydrochloric acid titration value of 100 cc (10 minutes value), a particle size of 2 to 10 mm, and cement consisting of blast furnace slag powder and 3 gypsum. The gypsum used was flue gas desulfurization gypsum with a particle size of 0.01 to 0.3 mm, and the sand-permeable material was river sand.
【００１７】[0017]
【表１】 [Table 1]
【００１８】上記の１〜６の各配合例からなる材料で、
緩い飽和砂質土地盤での硬焼生石灰杭工法に使用するパ
イルを作成し、その６０日養生後のパイルの強度等を測
定して、適否の判定をした結果を表２に示す。A material consisting of the above-mentioned examples 1 to 6,
Table 2 shows the results of making a pile for use in the hard-burned lime pile method on loose saturated sandy soil, measuring the strength of the pile after curing for 60 days, and judging the suitability.
【００１９】強度等の測定に供したパイルの作成は次の
ようにした。図１の（１）ないし（６）は、パイルの作
成手順を示す工程図である。先ず、図１（１）に示すよ
うに、内径３１ｃｍ、高さ３２ｃｍの円筒状の容器１内
の中心に、内径９ｃｍの管２を設置し、この容器内に砂
質土３を充填する。The pile used for the measurement of the strength and the like was prepared as follows. (1) to (6) of FIG. 1 are process charts showing a procedure for creating a pile. First, as shown in FIG. 1A, a pipe 2 having an inner diameter of 9 cm is installed at the center of a cylindrical container 1 having an inner diameter of 31 cm and a height of 32 cm, and this container is filled with sandy soil 3.
【００２０】次に、図１（２）に示すように、上記の砂
質土３に水４を加えて飽和砂質土３ａを形成する。そし
て、図１の（３）に示すように管２の中に上記の各配合
材料５を充填した後、（４）に示すように管２を抜き取
り、飽和砂質土中に配合材料からなるパイル５ａが打設
された状態とする。Next, as shown in FIG. 1 (2), water 4 is added to the sandy soil 3 to form a saturated sandy soil 3a. Then, as shown in FIG. 1 (3), after filling each of the above-mentioned compounding materials 5 into the tube 2, as shown in (4), the tube 2 is pulled out and made of the compounding material in the saturated sandy soil. It is assumed that the pile 5a is placed.
【００２１】次に、図１の（５）に示すように、飽和砂
質土３ａとパイル５ａの上に鉄板６を載置し、この鉄板
の上に２０ｋｇの錘７を載せて、６０日間放置した後、
図１（６）に示すように、飽和砂質土３ａを取り除き、
パイル５ａを取り出して強度等の測定に供する。Next, as shown in FIG. 1 (5), an iron plate 6 is placed on the saturated sandy soil 3a and the pile 5a, and a 20 kg weight 7 is placed on the iron plate for 60 days. After leaving
As shown in FIG. 1 (6), the saturated sandy soil 3a is removed,
The pile 5a is taken out and used for measurement of strength and the like.
【００２２】ここで、上記の１〜４と６の各配合例から
なる材料によるパイルの作成における水４の供給は上記
のとおり当初のみであるが、配合例５については、６０
日間の放置と硬焼生石灰との反応による水の減少を補う
ため、飽和砂質土３ａ内の水が常に飽和しているように
水の供給を続けながらパイルを作成した。Here, the supply of water 4 in the preparation of the pile from the material composed of each of the above-mentioned examples 1 to 4 and 6 is only the initial stage as described above.
In order to compensate for a decrease in water due to standing for a day and reaction with hard-burned lime, a pile was created while continuing to supply water so that the water in the saturated sandy soil 3a was always saturated.
【００２３】[0023]
【表２】 （注）含水比は重量％、密度はｔ／ｍ3、強度はｋｐａであり 判定の○は使用可を表す[Table 2] (Note) Moisture content is% by weight, density is t / m 3 , strength is kpa.
【００２４】表２に示す結果から明らかなように、相応
のパイルの膨張率と強度が得られたので、前記の配合例
１〜６は、硬焼生石灰杭工法における液状化防止用地盤
改良材として用いる砂、砕石等の透水性材料や、硬化材
としての水滓の代替材料として使用することが可能であ
る。配合例１〜４及び６と配合例５の強度の差異は、飽
和砂質土３ａへの水の供給の有無によって生じたもので
ある。即ち、配合例５の場合は、６０日間にわたり水が
１００％飽和した状態であるが、このような場合でも灰
スラグを固めることができ、膨張、締固めの作用による
密度の増加や水平土圧の増加が期待できる。As is evident from the results shown in Table 2, the corresponding pile expansion coefficient and strength were obtained. It can be used as a substitute for water-permeable materials such as sand and crushed stone used as a material, and as slag as a hardening material. The difference in strength between Formulation Examples 1 to 4 and 6 and Formulation Example 5 is caused by the presence or absence of water supply to the saturated sandy soil 3a. That is, in the case of Formulation Example 5, the water is 100% saturated for 60 days, but even in such a case, the ash slag can be solidified, the density increases due to the action of expansion and compaction, and the horizontal earth pressure is increased. Can be expected to increase.
【００２５】次に、前記の本発明に係る各配合例による
配合材料について、埋め立て処分をした場合の各種有害
金属成分の溶出量を測定した結果、以下に示すように基
準値以下であり、安全が確認された。 成 分 総水銀 ６価クロム 鉛 シアン カドミウム 砒素 基準値 0.005以下 1.5以下 3以下 1以下 0.03以下 1.5以下 配合例 ナシ 0.07以下 0.02以下 0.05以下 0.01以下 0.01以下 （注）各溶出量数値の単位は、ｍｇ／ｌで示すNext, with respect to the blended materials according to the blending examples according to the present invention described above, the amounts of elution of various harmful metal components in the case of landfill disposal were measured. Was confirmed. Ingredient Total mercury Hexavalent chromium Lead Cyan cadmium Arsenic Standard value 0.005 or less 1.5 or less 3 or less 1 or less 0.03 or less 1.5 or less Formulation example Pear 0.07 or less 0.02 or less 0.05 or less 0.01 or less 0.01 or less (Note) The unit of each elution amount is mg / L
【００２６】[0026]
【発明の効果】本発明は、地下水位の高い緩い砂質土地
盤で液状化の危険性が高い場合や支持力不足の場合に使
用する地盤改良材に関するものであり、特に、都市ごみ
等の焼却灰を溶融して得られたスラグを利用する地盤改
良材であって、その使用に当たっては、地盤中に杭状に
打設して用いることが好ましいものである。本発明によ
れば、都市ごみ等の廃棄物の再利用を図ることができ、
かつ地盤改良材として用いる砂、砕石等の透水性材料
や、硬化材としての水滓の代替材料として、都市ごみ等
の焼却灰を溶融して得られたスラグを利用することがで
きる。また、有害金属の溶出量も基準値以下であり、安
全に使用することができ、都市ごみの大量消費、処分が
可能であり、環境汚染にも影響がない。Industrial Applicability The present invention relates to a soil improvement material used in a case where the risk of liquefaction is high or the bearing capacity is insufficient in a loose sandy ground having a high groundwater level, It is a ground improvement material using slag obtained by melting incineration ash, and it is preferable to use the ground improvement material by driving it into a pile shape in the ground. According to the present invention, it is possible to reuse waste such as municipal waste,
In addition, slag obtained by melting incinerated ash such as municipal solid waste can be used as a substitute for a water-permeable material such as sand or crushed stone used as a ground improvement material or a slag as a hardening material. In addition, the amount of harmful metals eluted is below the standard value, it can be used safely, large-scale consumption and disposal of municipal waste is possible, and there is no effect on environmental pollution.
【図１】図１の（１）ないし（６）は、強度等の測定に
供したパイルの作成手順を示す工程図である。1 (1) to (6) are process diagrams showing a procedure for preparing a pile used for measurement of strength and the like.
１ 容器 ２ 管 ３ 砂質土 ３ａ 飽和砂質土 ４ 水 ５ 配合材料 ５ａ パイル ６ 鉄板 ７ 重り DESCRIPTION OF SYMBOLS 1 Container 2 Pipe 3 Sandy soil 3a Saturated sandy soil 4 Water 5 Compounding material 5a Pile 6 Iron plate 7 Weight
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ // Ｃ０９Ｋ 103:00 (72)発明者 花田 光雄 神奈川県鎌倉市梶原２−５−７ (72)発明者 光成 高志 東京都中央区京橋１−７−１ 戸田建設株 式会社内──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification symbol FI // C09K 103: 00 (72) Inventor Mitsuo Hanada 2-5-7 Kajiwara, Kamakura City, Kanagawa Prefecture (72) Inventor Takashi Mitsunari Tokyo 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd.
Claims (6)
ラグと、硬焼生石灰と、セメントとの混合物からなるこ
とを特徴とする液状化防止用地盤改良材。1. A soil improvement material for preventing liquefaction, comprising a mixture of slag obtained by melting incinerated ash of municipal solid waste, hard burnt lime, and cement.
ラグと、硬焼生石灰と、セメントと、透水性材料との混
合物からなることを特徴とする液状化防止用地盤改良
材。2. A soil improvement material for preventing liquefaction, comprising a mixture of slag obtained by melting incinerated ash of municipal solid waste, hard burnt lime, cement, and a water-permeable material.
ラグと、硬焼生石灰と、石膏と、透水性材料との混合物
からなることを特徴とする液状化防止用地盤改良材。3. A soil improvement material for preventing liquefaction, comprising a mixture of slag obtained by melting incinerated ash from municipal solid waste, hard burnt lime, gypsum, and a water-permeable material.
ラグが、溶融スラグを急冷又は徐冷したものを、粉砕し
て細粒に調製したものである請求項１、２又は３に記載
の液状化防止用地盤改良材。4. A slag obtained by melting incinerated ash of municipal solid waste, wherein slag obtained by rapidly or slowly cooling molten slag is prepared by pulverizing into fine granules. The liquefaction-preventing ground improvement material described in the above.
５００℃で焼成して得られた硬焼生石灰であって、その
粒径が５ｍｍ以上のものである請求項１、２又は３に記
載の液状化防止用地盤改良材。5. The hard-burned quick lime converts limestone to 1,200 to 1,1,
The ground improvement material for liquefaction prevention according to claim 1, wherein the calcined quick lime obtained by firing at 500 ° C. has a particle size of 5 mm or more.
用いるものである請求項１、２、３、４又は５に記載の
液状化防止用地盤改良材。6. The soil improvement material for preventing liquefaction according to claim 1, wherein the soil improvement material is used by being driven into the ground in a pile shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28796496A JP3390614B2 (en) | 1996-10-30 | 1996-10-30 | Ground improvement material for liquefaction prevention |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28796496A JP3390614B2 (en) | 1996-10-30 | 1996-10-30 | Ground improvement material for liquefaction prevention |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10130645A true JPH10130645A (en) | 1998-05-19 |
| JP3390614B2 JP3390614B2 (en) | 2003-03-24 |
Family
ID=17724038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28796496A Expired - Lifetime JP3390614B2 (en) | 1996-10-30 | 1996-10-30 | Ground improvement material for liquefaction prevention |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3390614B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009079161A (en) * | 2007-09-27 | 2009-04-16 | Jfe Mineral Co Ltd | Ground improving material |
| JP2010084473A (en) * | 2008-10-01 | 2010-04-15 | Asahi Kasei Construction Materials Co Ltd | Method for forming columnar body |
-
1996
- 1996-10-30 JP JP28796496A patent/JP3390614B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009079161A (en) * | 2007-09-27 | 2009-04-16 | Jfe Mineral Co Ltd | Ground improving material |
| JP2010084473A (en) * | 2008-10-01 | 2010-04-15 | Asahi Kasei Construction Materials Co Ltd | Method for forming columnar body |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3390614B2 (en) | 2003-03-24 |
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