JP2819438B2 - Manufacturing method of lightweight embankment for soft ground - Google Patents
Manufacturing method of lightweight embankment for soft groundInfo
- Publication number
- JP2819438B2 JP2819438B2 JP3085692A JP8569291A JP2819438B2 JP 2819438 B2 JP2819438 B2 JP 2819438B2 JP 3085692 A JP3085692 A JP 3085692A JP 8569291 A JP8569291 A JP 8569291A JP 2819438 B2 JP2819438 B2 JP 2819438B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- embankment
- soft ground
- density
- soil
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は軟弱地盤用軽量盛土の製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a lightweight embankment for soft ground.
【０００２】[0002]
【従来の技術】我が国の沖積平野には高含水比の粘土や
高有機質土の超軟弱地盤が各所に存在し、都市の発展に
伴って堤防、道路、宅地の整備や構築が行なわれてい
る。しかし、軟弱地盤地帯の土構造物は、含水比が５０
〜１０００重量％、多くは７０〜２００重量％と高い粘
上質の軟弱地盤の上に形成されているものであって、軟
弱地盤に滑りが生じたり、長い時間経過すると土構造物
に沈下が生じたりする。2. Description of the Related Art In Japan, alluvial plains have extremely soft grounds of high moisture content clay and high organic soil at various locations, and embankments, roads, and residential lands are being constructed and constructed with the development of cities. . However, soil structures in soft ground have a water content of 50%.
~ 1000% by weight, mostly 70 ~ 200% by weight, which is formed on a soft ground with high viscosity, causing slip on the soft ground or sinking in the soil structure after a long time. Or
【０００３】したがって、その補修のために、新たに土
構造物の上に盛上を行なったりしている。一方、軟弱地
盤の盛土の改良方法としては、軟弱地盤の含水比の高い
粘性土にかさ密度が０．０１〜０．３０ｇ／ｃｍ３であ
る独立気泡構造の発泡樹脂粒子、或いは更にセメント
類、水ガラス類、生石灰類、水性樹脂エマルジョン類よ
り選ばれたバインダーを配合して、密度が０．３〜１．
３ｇ／ｃｍ３の軽量土とする方法が知られている（特開
昭６４一２２６９１４公報、特開昭５１一４５６２公報
を参照）。[0003] Therefore, in order to repair the above, a ridge is newly formed on the earth structure. On the other hand, as a method of improving the embankment of soft ground, foamed resin particles having a closed cell structure having a bulk density of 0.01 to 0.30 g / cm 3 or a cement, Binders selected from water glasses, quicklimes, and aqueous resin emulsions are blended to obtain a density of 0.3 to 1.
A method for producing a lightweight soil of 3 g / cm 3 is known (see JP-A-64-226914 and JP-A-51-14562).
【０００４】[0004]
【発明が解決しようとする課題】上記の盛土の改良方法
では、粘性上と独立気泡構造である発泡樹脂粒子の密
度が大きく異なるため、均一に混合しにくいこと、施
工現場で混合するため、かさ密度の小さい発泡樹脂粒子
が風で周囲に飛散すること、発泡樹脂粒子がかさばる
ので、発泡させる工場から施工現場まで輸送するのに費
用がかかりすぎること等の問題がある。In the above-mentioned method for improving the embankment, since the viscosity and the density of the foamed resin particles having a closed cell structure are greatly different from each other, it is difficult to mix them uniformly. There are problems that the foamed resin particles having a low density are scattered around by wind and that the foamed resin particles are bulky, so that it takes too much cost to transport the foamed resin particles from a factory for foaming to a construction site.
【０００５】本発明は上記の問題を解決したものであっ
て、その目的は経時的な地盤沈下が小さく、補修の回数
を減らすことができる軟弱地盤用軽量盛土の製造方法を
提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a method for producing a lightweight embankment for soft ground, which can reduce the number of repairs and reduce the land subsidence over time. .
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明の特徴とする軟弱地盤用軽量盛土の製造方法
は含水比が１０〜４００重量％である土砂の乾燥重量１
重量部に対して発泡性ポリスチレンビーズ（発泡する前
の原料）を０．０１〜０．２０重量部、生石灰を０．０
５〜０．８０重量部の割合で混合させて、生石灰と土砂
に含まれている水分との反応熱で発泡性ポリスチレンビ
ーズを発泡させ、密度が０．５〜１．５ｇ／ｃｍ３の軽
量土とするものである。In order to achieve the above object, a method for producing a lightweight embankment for soft ground, which is a feature of the present invention, comprises a method for producing a dry embankment having a water content of 10 to 400% by weight.
0.01 to 0.20 parts by weight of expandable polystyrene beads (raw material before foaming) and 0.02 parts by weight of
The mixture is mixed at a ratio of 5 to 0.80 parts by weight, and the expandable polystyrene beads are expanded by the heat of reaction between quick lime and water contained in the earth and sand, and the density is 0.5 to 1.5 g / cm 3, a light weight. Earth.
【０００７】しかして、上記盛土の成分である発泡性ポ
リスチレンビーズは、含水比が１０〜４００重量％であ
る土砂の乾燥重量１重量部に対し０．０１〜０．２０重
量部の割合で用いられるが、発泡性ポリスチレンビーズ
の混合割合が０．０１重量部より少ないと密度の軽減化
に効果が小さく、沈下防止の効果が低い。そして、０．
２０重量部より多いと盛土の強度が弱くなってしまう。[0007] The expandable polystyrene beads as a component of the embankment are used in an amount of 0.01 to 0.20 parts by weight based on 1 part by weight of the dry weight of earth and sand having a water content of 10 to 400% by weight. However, if the mixing ratio of the expandable polystyrene beads is less than 0.01 part by weight, the effect of reducing the density is small and the effect of preventing settlement is low. And 0.
If the amount is more than 20 parts by weight, the strength of the embankment becomes weak.
【０００８】次に、生石灰は、土砂の乾燥重量１重量部
に対し、０．０５〜０．８０重量部の割合で用いられる
が、生石灰の混合割合が０．０５重量部より少ないと生
石灰と水の反応熱が少なく、発泡性ポリスチレンビーズ
を十分発泡させることができない。したがって、密度の
軽減化に効果が小さく、沈下防止の効果が低い。また、
０．８０重量部より多いと生石灰と水の反応熱が高くな
りすぎて、発泡ポリスチレンビーズが熱収縮を起こし、
密度の軽減化の効果が小さくなり、生石灰の量が少ない
場合と同様に沈下防止の効果が低くなってしまう。Next, quick lime is used in a ratio of 0.05 to 0.80 parts by weight with respect to 1 part by weight of the dry weight of earth and sand. If the mixing ratio of quick lime is less than 0.05 parts by weight, quick lime is used. The reaction heat of water is so small that the expandable polystyrene beads cannot be sufficiently expanded. Therefore, the effect of reducing the density is small, and the effect of preventing settlement is low. Also,
If it is more than 0.80 parts by weight, the reaction heat of quicklime and water becomes too high, and the expanded polystyrene beads undergo thermal contraction,
The effect of reducing the density is reduced, and the effect of preventing settlement is reduced as in the case where the amount of quicklime is small.
【０００９】盛土の密度は沈下防止の観点からは小さい
ほどよいが、用いられる土砂、発泡性ポリスチレンビー
ズ、生石灰の配合料や盛土の強度面より制限され、通常
は０．５〜１．５ｇ／ｃｍ３、好ましくは０．７〜１．
３ｇ／ｃｍ３の範囲がよい。また、密度は盛上が水浸透
性を有する場合は１ｇ／ｃｍ３よリ小さくできるが、地
下水、河川水、海水等の浮力を考慮すると盛土の密度は
１ｇ／ｃｍ３より高い方が好ましい。The density of the embankment is preferably as small as possible from the viewpoint of preventing settlement, but it is limited by the composition of earth and sand, expandable polystyrene beads, quick lime and the strength of the embankment, and is usually 0.5 to 1.5 g / g. cm 3, preferably 0.7 to 1.
A range of 3 g / cm 3 is preferable. When the embankment has water permeability, the density can be made smaller than 1 g / cm 3. However, in consideration of the buoyancy of groundwater, river water, seawater, etc., the density of the embankment is preferably higher than 1 g / cm 3 .
【００１０】[0010]
【実施例】実施例１ 含水比が２０重量％である土砂（湿潤密度が約１．７ｇ
／ｃｍ３）乾燥重量１重量部に対し、密度が１ｇ／ｃｍ
３、粒径が１〜２ｍｍφの発泡性ポリスチレンビーズ
（発泡する前の原料）０．０４重量部を加えて十分に混
合した。更に、生石灰０．３重量部を加えてよく混合し
た。混合した直後から土砂に含まれる水分と生石灰との
反応熱で発泡性ポリスチレンビーズが発泡し始めた。発
泡はおよそ３０分間継続し、その発泡が完了した後にタ
ンパーにより転圧した。得られた土（軽量土）の密度は
０．７４ｇ／ｃｍ３であった。EXAMPLE 1 Earth and sand having a water content of 20% by weight (wet density of about 1.7 g)
/ Cm 3 ) Density is 1 g / cm for 1 part by weight of dry weight
3. 0.04 parts by weight of expandable polystyrene beads (raw material before foaming) having a particle size of 1 to 2 mmφ were added and mixed well. Further, 0.3 part by weight of quick lime was added and mixed well. Immediately after mixing, the expandable polystyrene beads began to foam due to the heat of reaction between the water contained in the earth and sand and the quicklime. Foaming lasted approximately 30 minutes and was tumbled after the foaming was completed. The density of the obtained soil (light soil) was 0.74 g / cm 3 .
【００１１】そして、モンモリロナイト（比重が２．
４）を主成分とする粘土６５重量％、シルト質土３２重
量％及び砂３重量％を固体分とする含水比が９１重量％
の海成粘土層（深さが２０ｍ）１上に、軽量土（盛土）
を用いて図１に示すような盛土（ｈ＝６ｍ、ｈ。＝２
ｍ、ｌ＝４ｍ、ｌ。＝２８ｍ）２を築造することを想定
した。この盛土について、海成粘土の圧密試験のｅ−ｌ
ｏｇＰ曲線（ｅ＝間隙比、Ｐ＝圧密圧力）から求められ
る圧縮指数Ｃｃから圧密沈下量Then, montmorillonite (specific gravity of 2.
4) The main component is 65% by weight of clay, 32% by weight of silty soil and 3% by weight of sand.
Marine clay layer (depth 20m) 1 on a light soil (filling)
The embankment as shown in FIG. 1 (h = 6 m, h. = 2)
m, l = 4 m, l. = 28m) 2. This embankment, compaction test of marine clay e - l
The amount of consolidation settlement from the compression index Cc obtained from the logP curve (e = gap ratio, P = consolidation pressure)
【００１２】[0012]
【数１】 (Equation 1)
【００１３】をシミレーションモデルより算出したとこ
ろ、沈下量は最大０．８８ｍとなった。ただし、Ｃｃ＝
圧縮指数（０．７４）、ｅ。＝初期間隙比（２．３
８）、Ｐ。＝有効土かぶり圧力、△Ｐ盛土荷重による増
加圧力、Ｈ＝盛土下の軟弱地盤層の厚さである。Calculated from the simulation model, the subsidence amount was a maximum of 0.88 m. Where Cc =
Compression index (0.74), e. = Initial gap ratio (2.3
8), P. = Effective soil cover pressure, ΔP Increased pressure due to embankment load, H = Thickness of soft ground layer under embankment.
【００１４】実施例２〜５ 実施例１と同じ方法で、加える発泡性ポリスチレンビー
ズと生石灰の量、土砂の含水比を違えた配合で軽量土を
製造し、シミレーションで沈下量を計算した。これを後
記の表１に示す。Examples 2 to 5 In the same manner as in Example 1, light-weight soil was produced by adding different amounts of expandable polystyrene beads and quicklime and a different water content ratio of soil and sand, and the amount of settlement was calculated by simulation. This is shown in Table 1 below.
【００１５】比較例 蜜度が１．４１／ｃｍ３、含水比が９１重量％の海成粘
土よりなる軟弱地盤（深さ２０ｍ）の上に、締め固めた
蜜度が１．８ｇ／ｃｍ３の通常土を盛土して、図１に示
すような盛土を築造することを想定した。そして、シミ
レーションで計算した沈下量は１．９５４ｍであった。Comparative Example On a soft ground (depth: 20 m) made of marine clay having a honeyness of 1.41 / cm 3 and a water content of 91% by weight, a honeyness of 1.8 g / cm 3 was compacted. It is assumed that the normal soil of the above is embanked to construct an embankment as shown in FIG. The amount of settlement calculated by simulation was 1.954 m.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【発明の効果】実施例１〜５と比較例において、計算に
より従来の上構造物と比較して本発明方法により製造さ
れた盛土が使用されている土構造物の沈下量は大巾に低
下することが確認でき、補修の回数を少なくする上に有
効である。そして、本発明方法により得られた軽量土は
地盤への荷重負荷の軽減に役立つことは勿論のこと、発
泡する前の発泡性ポリスチレンビーズは蜜度が約１ｇ／
ｃｍ３であるため、蜜度が１．３〜２．０ｇ／ｃｍ３の
土と均一に混合することができ、施工中に風で周囲に飛
散する心配がないので、取扱いに極めて便利である。In the examples 1 to 5 and the comparative example, the settlement amount of the earth structure using the embankment manufactured by the method of the present invention is significantly reduced as compared with the conventional upper structure by calculation. This is effective in reducing the number of repairs. The lightweight soil obtained by the method of the present invention not only helps to reduce the load on the ground, but also the expandable polystyrene beads before foaming have a honeyness of about 1 g / g.
cm 3 , it can be uniformly mixed with soil having a honey concentration of 1.3 to 2.0 g / cm 3 , and there is no need to worry about scattering around by wind during construction, which is extremely convenient for handling. .
【００１８】また、発泡したビーズと比較し、発泡する
前の発泡性ポリスチレンビーズは一般に１／３０〜１／
５０の容積であるため、輸送費の面でも著しく有利であ
り、加えて、施工現場の軟弱地盤の土砂を構成材として
利用できるので、従来のように山砂を運搬する費用は削
減され、その分だけコストダウンが可能となる利点があ
る。更にまた、生石灰と土砂中の水分との反応で水分含
有率が低下し、土砂の改質にも効果がある。Compared with expanded beads, expandable polystyrene beads before expansion are generally 1/30 to 1/30.
Since it has a volume of 50, it is extremely advantageous in terms of transportation costs, and in addition, since the soil of the soft ground at the construction site can be used as a constituent material, the cost of transporting mountain sand as in the past is reduced, and There is an advantage that cost can be reduced by the amount. Furthermore, the reaction between quick lime and water in the earth and sand reduces the water content, which is also effective in improving the earth and sand.
【図１】本発明製造方法により製造された軽量盛土が使
用されている土構造物の側断面図である。FIG. 1 is a side sectional view of an earth structure using a lightweight embankment manufactured by the manufacturing method of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中村 勝敏 三重県四日市市川尻町1000番地 三菱油 化バーデイツシエ株式会社内 (72)発明者 今村 時次 三重県四日市市川尻町1000番地 三菱油 化バーデイツシエ株式会社内 (56)参考文献 特開 平１−226914（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 3/00 101 E02D 17/18──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsutoshi Nakamura 1000 Kawajiri-cho, Yokkaichi, Mie Prefecture Inside Mitsubishi Yuka Birdsie Co., Ltd. (56) References JP-A-1-226914 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) E02D 3/00 101 E02D 17/18
Claims (1)
乾燥重量１重量部に対して発泡性ポリスチレンビーズを
０．０１〜０．２０重量部、生石灰を０．０５〜０．８
０重量部の割合で混合させて、生石灰と土砂に含まれて
いる水分との反応熱で発泡性ポリスチレンビーズを発泡
させ、密度が０．５〜１．５／ｃｍ３の軽量土とするこ
とを特徴とする軟弱地盤用軽量盛土の製造方法。1. A foaming polystyrene bead having a water content of 10 to 400% by weight, a dry weight of 1 part by weight, expandable polystyrene beads in an amount of 0.01 to 0.20 part by weight, and quick lime in a weight of 0.05 to 0.8 part.
0 by mixing at a ratio of parts by weight, the expandable polystyrene beads by the reaction heat of water contained in the quick lime and sand foamed, density and lightweight soil 0.5 to 1.5 / cm 3 that A method for producing a lightweight embankment for soft ground, characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3085692A JP2819438B2 (en) | 1991-01-25 | 1991-01-25 | Manufacturing method of lightweight embankment for soft ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3085692A JP2819438B2 (en) | 1991-01-25 | 1991-01-25 | Manufacturing method of lightweight embankment for soft ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04250212A JPH04250212A (en) | 1992-09-07 |
| JP2819438B2 true JP2819438B2 (en) | 1998-10-30 |
Family
ID=13865894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3085692A Expired - Fee Related JP2819438B2 (en) | 1991-01-25 | 1991-01-25 | Manufacturing method of lightweight embankment for soft ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2819438B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06146288A (en) * | 1992-11-17 | 1994-05-27 | Pub Works Res Inst Ministry Of Constr | Light weighted banking |
| JP2559978B2 (en) * | 1993-06-25 | 1996-12-04 | 建設省土木研究所長 | Mixed lightweight soil |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01226914A (en) * | 1988-03-07 | 1989-09-11 | Matsuo Kensetsu Kk | Improvement of weak ground |
-
1991
- 1991-01-25 JP JP3085692A patent/JP2819438B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04250212A (en) | 1992-09-07 |
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