JP3031201B2 - Manufacturing method of fiber mixed soil - Google Patents
Manufacturing method of fiber mixed soilInfo
- Publication number
- JP3031201B2 JP3031201B2 JP14322895A JP14322895A JP3031201B2 JP 3031201 B2 JP3031201 B2 JP 3031201B2 JP 14322895 A JP14322895 A JP 14322895A JP 14322895 A JP14322895 A JP 14322895A JP 3031201 B2 JP3031201 B2 JP 3031201B2
- Authority
- JP
- Japan
- Prior art keywords
- fibrous
- earth
- sand
- fiber
- mixed
- 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)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、繊維混合土の製造方
法に関し、特に、土砂に混合される繊維状物質を均一に
分散させる技術に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber-mixed soil, and more particularly to a technique for uniformly dispersing a fibrous substance mixed with earth and sand.
【０００２】[0002]
【従来の技術】土砂に繊維状物質を混合した補強土ない
しは改良土を使用して、地盤の補強や改良を行なう繊維
混合補強土工法ないしは繊維混合改良土工法が知られて
いる。この種の工法では、例えば、盛土法面を補強する
場合には、現場採取土壌に高分子材料からなる短繊維を
混合して、これを法面上に転圧することにより施工さ
れ、また、地盤改良の場合には、土砂にセメントや石灰
などを混入した安定処理土に短繊維を混合して使用され
る。2. Description of the Related Art A fiber-reinforced reinforced earth method or a fiber-mixed improved earth method for reinforcing or improving the ground by using a reinforced soil or an improved soil obtained by mixing a fibrous substance with earth and sand is known. In this type of construction method, for example, when reinforcing the embankment slope, it is constructed by mixing short fibers made of a polymer material with the soil collected at the site and rolling it on the slope, and In the case of improvement, short fibers are mixed with a stabilized soil obtained by mixing cement, lime, or the like in soil and used.
【０００３】ところで、この種の工法においては、地盤
の補強ないしは改良に先立って、土砂に繊維状物質を混
合した混合土を製造することになるが、このような混合
土の製造には、特に、土砂と繊維状物質の性質の相違に
基づき、これらを混合する際に、以下に述べる重要な技
術的な改良点が指摘されていた。すなわち、粒状体であ
る土砂と繊維状物質とを単純に混合すると、土砂と繊維
状物質との間のかさ比重の差が大きいので、重量が軽い
繊維状物質が上部側に移行し、重量が重い土砂が下部側
に移行する傾向があって、両者が上下に分離して、繊維
状物質を土砂中に均一に分散させることが、非常に困難
になることである。[0003] In this type of construction method, prior to reinforcement or improvement of the ground, a mixed soil in which a fibrous substance is mixed with earth and sand is produced. On the basis of differences in the properties of earth and sand and fibrous substances, the following important technical improvements have been pointed out when mixing them. That is, if the earth and sand, which are granular materials, and the fibrous material are simply mixed, the difference in the bulk specific gravity between the earth and sand and the fibrous material is large. The heavy earth and sand tends to move to the lower side, and it is very difficult for both to be separated vertically and to disperse the fibrous material uniformly in the earth and sand.
【０００４】そこで、特開平２−５５７８６号公報に
は、このような問題点を解消して、繊維状物質を土砂中
に均一に分散させる繊維混合土の製造方法が提案されて
いる。この公報に開示されている製造方法では、特定の
太さと長さとを有する繊維状物質と土砂とを、遠心拡散
または攪拌作用および渦流拡散または攪拌作用により混
合することを要旨としている。[0004] Japanese Patent Application Laid-Open No. 2-55786 proposes a method for producing a fiber-mixed soil in which such a problem is solved and a fibrous substance is uniformly dispersed in earth and sand. The gist of the production method disclosed in this publication is to mix a fibrous substance having a specific thickness and length with earth and sand by centrifugal diffusion or stirring and eddy diffusion or stirring.
【０００５】このような繊維混合土の製造方法によれ
ば、土砂および繊維状物質に遠心拡散（攪拌）と渦流拡
散（攪拌）とが加えられ、これらの作用により両者に三
次元方向の流動性が与えられるので、繊維状物質を土砂
中に均一に分散させることができる。しかしながら、こ
のような繊維混合土の製造方法には、以下に説明する技
術的な課題があった。According to such a method for producing a fiber-mixed soil, centrifugal diffusion (stirring) and vortex diffusion (stirring) are added to soil and fibrous materials, and the three-dimensional fluidity is imparted to the two due to these effects. Is given, so that the fibrous substance can be uniformly dispersed in the earth and sand. However, such a method for producing a fiber mixed soil has the following technical problems.
【０００６】[0006]
【発明が解決しようとする課題】すなわち、上述した公
報に開示されている繊維混合土の製造方法では、土砂お
よび繊維状物質に三次元方向の流動性を与える特殊な混
合機を必要とし、実用化する際にこの点が障害になる場
合があった。また、比較的水分率の大きい土砂と繊維状
物質とを混合する際には、繊維状物質が早期に吸水し
て、繊維状物質同士が相互に絡み合って、均一に分散さ
せることが困難になるとともに、混合機の攪拌翼に繊維
状物質が絡み付いて円滑な混合を阻害するという問題も
あった。That is, the method for producing a fiber-mixed soil disclosed in the above-mentioned publication requires a special mixer for giving three-dimensional fluidity to earth and sand and fibrous materials, and is not practical. In some cases, this point has become an obstacle when implementing the technology. Further, when mixing the soil and the fibrous material having a relatively high moisture content, the fibrous material absorbs water early, and the fibrous materials are entangled with each other, making it difficult to uniformly disperse the fibrous materials. At the same time, there is also a problem that the fibrous substance is entangled with the stirring blades of the mixer to hinder smooth mixing.
【０００７】本発明は、このような従来の問題点に鑑み
てなされたものであって、その第一の目的は、特殊な混
合機を使用することなく繊維状物質を均一に分散させる
ことができる繊維混合土の製造方法を提供することにあ
る。また、別の目的として、繊維状物質が早期に吸水し
て相互に絡み合うことや、混合機の攪拌翼に絡み付くこ
とが防止できる繊維混合土の製造方法を提供することに
ある。The present invention has been made in view of such conventional problems, and a first object of the present invention is to uniformly disperse fibrous substances without using a special mixer. It is an object of the present invention to provide a method for producing a fiber mixed soil that can be produced. Another object of the present invention is to provide a method for producing a fiber-mixed soil that can prevent the fibrous substances from absorbing water early and becoming entangled with each other, and from being entangled with the stirring blades of the mixer.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、土砂と短繊維状の繊維状物質とを混合す
る繊維混合土の製造方法において、前記繊維状物質は、
温度条件により塊状形態と繊維状形態とに変態する性質
を備え、前記土砂と混合する際に、前記繊維状物質が前
記塊状形態となるように前記温度条件を設定することを
特徴とする。前記繊維状物質は、所定温度以上で前記塊
状形態になり、所定温度以下で前記繊維状形態に変態す
る形状記憶性繊維で構成し、混合の終了後に前記所定温
度以下にすることができる。Means for Solving the Problems To achieve the above object, the present invention provides a method for producing a fiber mixed soil in which earth and sand are mixed with a short fibrous fibrous material, wherein the fibrous material comprises:
With the property of transformation into a more massive form and a fibrous form to a temperature condition, when mixing with the soil, characterized in that the fibrous material is to set the temperature condition such that the bulk form . The fibrous substance may be formed of the shape memory fiber which becomes the bulk form at a predetermined temperature or higher and transforms to the fibrous form at a predetermined temperature or lower, and may be lowered to the predetermined temperature or lower after the mixing is completed.
【０００９】[0009]
【作用】上記構成の繊維混合土の製造方法によれば、土
砂と混合される繊維状物質は、温度条件により塊状形態
と繊維状形態とに変態する性質を備え、土砂と混合する
際に、繊維状物質が塊状形態となるように温度条件を設
定するので、混合するときに塊状形態の繊維状物質と土
砂との間のかさ比重の差が非常に少なくなる。また、塊
状形態の繊維状物質は、吸水してもこれが温度条件を越
えなければ、繊維状形態に変態しないので、繊維状物質
の絡み合いも防止される。さらに、請求項２の構成によ
れば、繊維状物質は、所定温度以上で塊状形態になり、
所定温度以下で繊維状形態に変態する形状記憶性繊維で
構成し、繊維状物質が塊状形態となるように温度条件を
設定するので、混合するときには、かさ比重が大きくな
って、均一に分散させることができるとともに、吸水に
よる絡み合いも防止できる。また、この請求項２の構成
では、混合の終了後に所定温度以下にするので、繊維状
物質は、この段階で塊状形態から繊維状形態に変態し、
繊維状物質を土砂に混合することによる補強などの効果
が十分に発揮される。According to the method for producing a fiber-mixed soil having the above structure, the fibrous substance mixed with the earth and sand has a property of transforming into a lump form and a fibrous form depending on temperature conditions. Since the temperature conditions are set so that the fibrous substance is in a lump form, the difference in bulk specific gravity between the lump-shaped fibrous substance and the earth and sand during mixing is very small. In addition, the fibrous substance in the form of a lump does not transform into a fibrous form if it does not exceed the temperature condition even if it absorbs water, so that the entanglement of the fibrous substance is also prevented. Further, according to the configuration of claim 2, the fibrous substance becomes a lump at a predetermined temperature or more,
Composed of shape memory fibers transformed into a fibrous form at a predetermined temperature or lower, because the fibrous material to configure the way temperature condition becomes massive form, when mixed, in bulk specific gravity is increased, uniform dispersion And entanglement due to water absorption can be prevented. Further, the structure of claim 2
Then, since the temperature is reduced to a predetermined temperature or less after the end of the mixing, the fibrous substance is transformed from the bulk form to the fibrous form at this stage,
The effect such as reinforcement by mixing the fibrous substance with the earth and sand is sufficiently exhibited.
【００１０】[0010]
【実施例】以下本発明の好適な実施例について添附図面
を参照して詳細に説明する。図１は、本発明にかかる繊
維混合土の製造方法の一実施例を示している。同図に示
す実施例では、繊維混合土１０は、土砂１２と繊維状物
質１４とから構成され、これらを混合機１６内に投入し
て製造される。土砂１２は、例えば、盛土を構築する際
の現地発生土や、地盤改良する際に使用されるセメント
や石灰などを混入した安定処理土，砂質土，小礫などの
粒状体であれば使用することができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows one embodiment of a method for producing a fiber mixed soil according to the present invention. In the embodiment shown in FIG. 1, the fiber mixed soil 10 is composed of earth and sand 12 and fibrous substances 14, and is manufactured by putting them into a mixer 16. The earth and sand 12 may be used if it is a granular material such as a locally generated soil for constructing an embankment, a stabilized soil mixed with cement or lime used for soil improvement, a sandy soil, or small pebbles. can do.
【００１１】繊維状物質１４は、本実施例の場合には、
合成樹脂製のモノフィラメントやマルチフィラメント，
テープヤーン，紡績糸などを概略２〜３０ｃｍ程度に切
断した短繊維状のものであって、所定の温度条件（外部
付加条件）、例えば、５０〜７０℃程度の温度で渦巻形
状の塊状形態１４ａとなり、この温度以下の温度条件
で、その全長が概略２〜３０ｃｍ程度の繊維状形態１４
ｂに変態する、いわゆる形状記憶性繊維が採用されてい
る。In this embodiment, the fibrous substance 14 is
Monofilament or multifilament made of synthetic resin,
Tape yarn, spun yarn or the like is cut into a short fiber of about 2 to 30 cm, and is a spiral mass 14a under a predetermined temperature condition (external addition condition), for example, a temperature of about 50 to 70 ° C. Under the temperature condition below this temperature, the fibrous form 14 having a total length of about 2 to 30 cm
A so-called shape memory fiber that transforms into b is employed.
【００１２】繊維混合土１０を製造する際には、設計混
合比率に従って、土砂１２と繊維状物質１４とが計量さ
れ、混合機１６内に投入される。このとき使用する混合
機１６は、従来から広く使用されている通常の機械が使
用される。なお、この場合の混合比率は、繊維混合土１
０の用途によっても異なるが、繊維状物質１４は、土砂
１２に対して重量比で３〜２０％程度に設定される。When the fiber mixed soil 10 is manufactured, the earth and sand 12 and the fibrous material 14 are weighed in accordance with a designed mixing ratio, and are put into a mixer 16. As the mixer 16 used at this time, an ordinary machine widely used conventionally is used. In this case, the mixing ratio was 1 fiber mixed soil.
The fibrous substance 14 is set to a weight ratio of about 3 to 20% with respect to the earth and sand 12, though it varies depending on the use of the soil material 12.
【００１３】繊維状物質１４は、予め所定以上の温度に
加熱されて、渦巻形状の塊状形態１４ａにされ、この形
態で混合機１６内に供給される。混合機１６に土砂１２
と繊維状物質１４とが供給されると、これらを攪拌しな
がら混合することになるが、このとき混合機１６内の温
度は、繊維状物質１４が塊状形態１４ａを維持する温度
に、例えば、ヒータなどを制御して保たれる。The fibrous material 14 is heated to a predetermined temperature or more in advance to form a spiral mass 14a, which is supplied into the mixer 16 in this form. Earth and sand 12 in the mixer 16
When the fibrous material 14 is supplied, they are mixed while stirring them. At this time, the temperature in the mixer 16 is set to a temperature at which the fibrous material 14 maintains the mass form 14a, for example, The heater is controlled and kept.
【００１４】この場合、加熱により土砂１２の水分が大
きく低下する際には、散水することにより水分量の調整
を必要に応じて行なう。そして、混合機１６内で充分に
攪拌混合されると、土砂１２と繊維状物質１４との混合
物が取り出される。取り出された混合物は、徐々に温度
が低下するが、この温度が所定温度以下になるまでは、
繊維状物質１４は、塊状形態１４ａを維持している。In this case, when the water content of the earth and sand 12 is greatly reduced by heating, the water content is adjusted as required by spraying water. When the mixture is sufficiently stirred and mixed in the mixer 16, a mixture of the earth and sand 12 and the fibrous material 14 is taken out. The temperature of the removed mixture gradually decreases, but until the temperature falls below a predetermined temperature,
The fibrous material 14 maintains a massive form 14a.
【００１５】このようにして製造された繊維混合土１０
は、その後施工現場まで運搬されて、撒き出されるが、
この過程で、混合土１０の温度が所定温度以下になる
と、繊維状物質１４は、塊状形態１４ａから繊維状形態
１４ｂに変態し、この状態で転圧される。さて、以上の
ように構成された繊維混合土１０の製造方法によれば、
土砂１２と混合される繊維状物質１４は、所定温度（外
部付加条件）以上で塊状形態１４ａになり、所定温度以
下で繊維状形態１４ｂに変態する形状記憶性繊維で構成
し、土砂１２と繊維状物質１４とを混合機１６内で混合
する際に、繊維状物質１４が塊状形態１４ａとなるよう
に温度条件を設定するので、混合するときに塊状形態１
４ａの繊維状物質１４と土砂１２との間のかさ比重の差
が非常に少なくなる。The fiber mixed soil 10 thus manufactured
Is then transported to the construction site and scattered,
In this process, when the temperature of the mixed soil 10 becomes equal to or lower than a predetermined temperature, the fibrous material 14 is transformed from the massive form 14a to the fibrous form 14b, and is compacted in this state. Now, according to the method of manufacturing the fiber mixed soil 10 configured as described above,
The fibrous substance 14 mixed with the earth and sand 12 is formed of a shape memory fiber which becomes a bulk form 14a at a predetermined temperature (external addition condition) or higher and transforms into a fibrous form 14b at a predetermined temperature or lower. When the fibrous material 14 is mixed with the fibrous material 14 in the mixer 16, the temperature condition is set so that the fibrous material 14 becomes the bulk form 14 a.
The difference in the bulk specific gravity between the fibrous material 14a and the earth and sand 12 of 4a becomes very small.
【００１６】このため、従来、通常の混合機械でこれら
の物質を混合する際に発生していた、土砂１２と繊維状
物質１４との間の分離が発生せず、塊状形態１４ａの繊
維状物質１４を土砂１２中に均一に分散させることが、
特別の装置や手段を講じることなく行なえる。また、塊
状形態１４ａの繊維状物質１４は、吸水してもこれが所
定温度以下にならなければ、繊維状形態１４ｂに変態し
ないので、繊維状物質１４の絡み合いや、混合機１６の
攪拌翼への絡み付きも防止され、円滑な混合状態が確保
される。For this reason, the separation between the earth and sand 12 and the fibrous material 14 which has conventionally occurred when mixing these materials with a normal mixing machine does not occur, and the fibrous material in the bulk form 14a does not occur. 14 is uniformly dispersed in the earth and sand 12,
This can be done without any special equipment or measures. Also, the fibrous material 14 of the massive form 14a, if even if water it does not become under predetermined temperature degrees or, does not transform into fibrous form 14b, entanglement or fibrous material 14, a stirring blade mixer 16 Entanglement is also prevented, and a smooth mixing state is ensured.
【００１７】一方、上記混合土１０の製造方法では、混
合機１６で土砂１２と繊維状物質１４とを混合した後
に、所定温度以下にするので、繊維状物質１４は、この
段階で塊状形態１４ａから繊維状形態１４ｂに変態し、
繊維状物質１４を土砂１２に混合することによる補強な
どの効果が有効に発揮される。On the other hand, in the method for producing the mixed soil 10, since the earth and sand 12 and the fibrous material 14 are mixed by the mixer 16, the temperature is lowered to a predetermined temperature or less. Transformed into fibrous form 14b from
By mixing the fibrous substance 14 with the earth and sand 12, effects such as reinforcement are effectively exhibited.
【００１８】なお、上記実施例では、繊維状物質１４
が、温度条件により、渦巻き型の塊状形態から繊維状形
態に変態する場合を例示したが、本発明の実施は、これ
に限定されることはなく、混合する際にかさ比重が大き
くなる塊状形態であれば、例えば、コイル状や不定形な
塊状であってもよい。In the above embodiment, the fibrous material 14 is used.
However, according to the temperature conditions, the case where the shape is changed from the spiral type bulk form to the fibrous form is exemplified, but the practice of the present invention is not limited to this, and the bulk form in which the bulk specific gravity increases when mixing is performed. For example, the shape may be a coil shape or an irregular mass.
【００１９】[0019]
【発明の効果】以上、実施例で詳細に説明したように、
本発明にかかる繊維混合土の製造方法によれば、以下の
効果が奏される。繊維状物質は、塊状形態で混合する
ので、繊維状物質同士が相互に絡み合わないので、土砂
中に繊維状物質を均一に分散させた混合土の製造が可能
になる。塊状形態から繊維状形態に変態した繊維状物
質を土砂に分散させるので、土砂に粘着力を付与するこ
とができる。繊維状物質は、塊状形態で混合するの
で、土砂と繊維状物質との間のかさ比重の差が非常に少
なくなり、両者の分離が防止され、繊維状物質を土砂中
に均一に分散させることができ、盛土の法面などに使用
した際に、風雨などによる表層部の浸食を防止して、地
山全体のすべりを防止するなど、顕著な補強効果が発揮
される。繊維状物質は、塊状形態で混合するので、混
合機の攪拌翼への絡み付きが防止され、十分な混合を円
滑に行うことができる。特殊な混合装置や特殊な手段
を講じることなく、通常の混合装置で繊維状物質を土砂
中に均一に分散することができるので、直ちに実用化す
ることができ、しかも、経済的な面でも非常に有利とな
る。As described above in detail in the embodiments,
According to the method for producing a fiber mixed soil according to the present invention, the following effects can be obtained. Since the fibrous substances are mixed in a lump form, the fibrous substances do not become entangled with each other, so that it is possible to produce a mixed soil in which the fibrous substances are uniformly dispersed in earth and sand. Since the fibrous substance transformed from the massive form into the fibrous form is dispersed in the earth and sand, the earth and sand can be provided with an adhesive force. Since the fibrous material is mixed in a lump form, the difference in bulk specific gravity between the sediment and the fibrous material is very small, separation of the two is prevented, and the fibrous material is uniformly dispersed in the sediment. When used on slopes of embankments, it has a remarkable reinforcing effect, such as preventing erosion of the surface layer due to wind and rain and preventing slippage of the entire ground. Since the fibrous substances are mixed in a lump form, entanglement with the stirring blade of the mixer is prevented, and sufficient mixing can be performed smoothly. The fibrous substance can be evenly dispersed in the earth and sand with a normal mixing device without using a special mixing device or special means. This is advantageous.
【図１】本発明にかかる繊維混合土の製造方法の一実施
例を示す工程説明図である。FIG. 1 is a process explanatory view showing one embodiment of a method for producing a fiber mixed soil according to the present invention.
１０ 繊維混合土 １２ 土砂 １４ 繊維状物質 １４ａ 塊状形態 １４ｂ 繊維状形態 １６ 混合機 Reference Signs List 10 fiber mixed soil 12 earth and sand 14 fibrous material 14a lump form 14b fibrous form 16 mixer
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C09K 17/18 B28C 3/00 E02D 3/10 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) C09K 17/18 B28C 3/00 E02D 3/10
Claims (2)
る繊維混合土の製造方法において、 前記繊維状物質は、温度条件により塊状形態と繊維状形
態とに変態する性質を備え、 前記土砂と混合する際に、前記繊維状物質が前記塊状形
態となるように前記温度条件を設定することを特徴とす
る繊維混合土の製造方法。1. A soil and method for producing a fiber mixed soil for mixing the fibrous material of short fibers, the fibrous material has a property of transformed into a more massive form and a fibrous form to a temperature condition The method for producing a fiber-mixed soil, wherein the temperature condition is set so that the fibrous substance is in the lump form when mixed with the earth and sand.
塊状形態になり、所定温度以下で前記繊維状形態に変態
する形状記憶性繊維で構成し、混合の終了後に前記所定
温度以下にすることを特徴とする請求項１記載の繊維混
合土の製造方法。2. The fibrous substance is formed into the bulk form at a predetermined temperature or higher, and is formed of a shape memory fiber which transforms to the fibrous form at a predetermined temperature or lower, and is kept at the predetermined temperature or lower after the mixing is completed. The method for producing a fiber-mixed soil according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14322895A JP3031201B2 (en) | 1995-06-09 | 1995-06-09 | Manufacturing method of fiber mixed soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14322895A JP3031201B2 (en) | 1995-06-09 | 1995-06-09 | Manufacturing method of fiber mixed soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08337776A JPH08337776A (en) | 1996-12-24 |
| JP3031201B2 true JP3031201B2 (en) | 2000-04-10 |
Family
ID=15333886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14322895A Expired - Fee Related JP3031201B2 (en) | 1995-06-09 | 1995-06-09 | Manufacturing method of fiber mixed soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3031201B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6248424B2 (en) * | 2013-06-12 | 2017-12-20 | 株式会社大林組 | Ground improvement method |
| KR101970975B1 (en) * | 2018-02-28 | 2019-04-22 | 서상욱 | PVA Fiber Reinforcement Cement Mixture, PVA Fiber Reinforcement Including Cement Mixer Manufacturing Method and Description PVA Fiber Reinforcement Including Cement Mixer |
-
1995
- 1995-06-09 JP JP14322895A patent/JP3031201B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08337776A (en) | 1996-12-24 |
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