JP3156037B2 - How to recycle construction sludge - Google Patents
How to recycle construction sludgeInfo
- Publication number
- JP3156037B2 JP3156037B2 JP17579696A JP17579696A JP3156037B2 JP 3156037 B2 JP3156037 B2 JP 3156037B2 JP 17579696 A JP17579696 A JP 17579696A JP 17579696 A JP17579696 A JP 17579696A JP 3156037 B2 JP3156037 B2 JP 3156037B2
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- JP
- Japan
- Prior art keywords
- weight
- sludge
- construction
- soil
- solidifying agent
- 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.)
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- Treatment Of Sludge (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は建設汚泥のリサイク
ル方法、すなわちベントナイト系の汚泥又は汚水を含ん
でなる建設汚泥を土木・建設用の資材ないし再生土とし
て利用しうるようリサイクルする方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling construction sludge, that is, a method for recycling construction sludge containing bentonite sludge or wastewater so that it can be used as a material for civil engineering and construction or a reclaimed soil.
【０００２】[0002]
【従来の技術】建設工事に伴って発生するベンナイト汚
水や高含水比の微細粒子泥状物などは、一般に建設汚泥
と総称される。建設汚泥は、そのままでは他工事の盛土
などに直接利用できない掘削土等であることから、現状
では一部が再利用される場合を除き、ほとんどが産業廃
棄物の「汚でい」として廃棄物処理場で処分されてい
る。2. Description of the Related Art Bennite sewage and high-moisture-content fine-particle sludge generated during construction are generally referred to as construction sludge. Construction sludge is excavated soil that cannot be directly used as embankment for other works as it is, so at present, most of the waste is regarded as “dirty” industrial waste unless it is partially reused. Disposal at the treatment plant.
【０００３】このような建設汚泥の処分に際し、通常は
処分量の減容化またはハンドリングの改善のための処理
が行われる。この種の処理方法として、従来、例えば特
開平６−１３４５００号公報や特開平６−２７７６９８
号公報に記載されているように、汚泥に石灰系ないしセ
メント系の固化剤（以下、セメント系固化剤という）を
添加することにより、汚泥中の懸濁粒子を凝集・固化さ
せるものが知られている。しかし、セメント系固化剤に
より固化された汚泥処理物は、石灰分を比較的多く含ん
でいることから、その浸透水は一般に強いアルカリ性を
示す。これは、雨水などが汚泥処理物中に浸透した場
合、浸透水中にセメント分のＣａ+2、ＯＨ-などのイオ
ンが溶出するためであるが、このようなアルカリ性浸透
水が外部に流出すると、地下水汚染など周辺の環境汚染
を引き起こすおそれがある。[0003] When disposing of such construction sludge, treatment for reducing the volume of disposal or improving the handling is usually performed. Conventionally, as this type of processing method, for example, JP-A-6-134500 and JP-A-6-277698
As described in Japanese Patent Application Laid-Open Publication No. H10-209, there is known a method in which suspended particles in sludge are aggregated and solidified by adding a lime-based or cement-based solidifying agent (hereinafter, referred to as a cement-based solidifying agent) to sludge. ing. However, the treated sludge solidified by the cement-based solidifying agent contains a relatively large amount of lime, so that the permeated water generally shows strong alkalinity. This is because when the rainwater has permeated into the sludge treated cement content of Ca +2 to penetrate water, OH - but because the ions, such as are eluted, when such alkaline osmotic water flows out to the outside, It may cause environmental pollution in the surrounding area such as groundwater pollution.
【０００４】そこで、このような問題に対処するため、
例えば特開平６−１０６１９５号公報では、固化された
汚泥処理物を解砕して分級した後、その砕石にアルカリ
性イオンの溶出を防ぐ表面処理を施すことが提案されて
いる。Therefore, in order to deal with such a problem,
For example, Japanese Patent Application Laid-Open No. 6-106195 proposes that after a solidified sludge treatment product is crushed and classified, the crushed stone is subjected to a surface treatment for preventing elution of alkaline ions.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記特
開平６−１０６１９５号公報に記載の処理技術による
と、アルカリ性イオンの溶出を防ぐ表面処理を行うため
に海水やＨ2 ＳＯ4 水溶液等に砕石を相当時間浸漬した
り、砕石にＣＯ2 ガス等を吹きつけたりしなければなら
ない。したがって、汚泥固化用の設備とは別に、砕石の
表面を処理するための設備、材料、時間等を必要とし、
それだけ処理コストがかかるという問題がある。また、
従来の固化剤による汚泥処理方法では、建設汚泥を固化
できたとしても、得られた固化物に汚泥独特の臭いが残
ってしまうため、そのままの状態では埋め戻し土等に用
いることができないという問題がある。However, according to the processing technique described in Japanese Patent Application Laid-Open No. H06-106195, crushed stones are crushed in seawater or H 2 SO 4 aqueous solution in order to perform a surface treatment for preventing elution of alkaline ions. It has to be immersed for a considerable time, or to blow a crushed stone with CO 2 gas or the like. Therefore, apart from the equipment for solidifying sludge, equipment, materials, time, etc. for treating the surface of crushed stone are required,
There is a problem that the processing cost increases accordingly. Also,
With the conventional sludge treatment method using a solidifying agent, even if the construction sludge can be solidified, the resulting solidified material has a smell peculiar to the sludge, and cannot be used as it is for backfill soil. There is.
【０００６】本発明は、このような問題に対処するのも
ので、その目的とするところは、建設汚泥を土木・建設
用の資材なしい再生土として簡単かつ安価にリサイクル
できる方法を提供することにある。SUMMARY OF THE INVENTION The present invention addresses such a problem, and an object of the present invention is to provide a method for easily and inexpensively recycling construction sludge as reclaimed soil without materials for construction and construction. It is in.
【０００７】[0007]
【課題を解決するための手段】上記目的達成のため、本
発明に係る建設汚泥のリサイクル方法は、建設汚泥５０
重量％に対し、粒径が１０mm以下の建設残土１５〜２５
重量％と、粒径が１０〜１５mmのクラッシャーラン２５
〜３５重量％とを混合し、この混合物に、６５〜７０重
量％のＣａＯと、１３〜１６重量％のＳｉＯ 2 と、７〜
９重量％のＳＯ 3 と、４〜６重量％のＡｌ 2 Ｏ 3 と、１
〜２重量％の強熱減量とを有する固化剤を、重量比で９
〜１２％添加して混和することにより、当該混合物を固
化し、得られた固化物を所定期間養生して、埋め戻し土
として利用可能な汚泥処理物とすることを特徴とする。In order to achieve the above object, a method for recycling construction sludge according to the present invention comprises a method for recycling construction sludge.
Construction residual soil 15 to 25 with a particle size of 10 mm or less based on the weight%
Weight% and a crusher run 25 having a particle size of 10 to 15 mm.
To 35% by weight, and the mixture is added to a mixture of 65 to 70 weight%.
% Of CaO, 13 to 16% by weight of SiO 2 ,
9% by weight of SO 3 , 4 to 6% by weight of Al 2 O 3 ,
A solidifying agent having a loss on ignition of about 2% by weight,
The mixture is solidified by adding and mixing
After curing for a predetermined period,
It is characterized by sludge treatment that can be used as
【０００８】本発明で用いる固化剤は、化学成分とし
て、６５〜７０重量％のＣａＯと、１３〜１６重量％の
ＳｉＯ2 と、７〜９重量％のＳＯ3 と、４〜６重量％の
Ａｌ2Ｏ3 と、１〜２重量％の強熱減量とを含んでい
る。具体的には、６7.７重量％のＣａＯと、１４．４重
量％のＳｉＯ2 と、7.８重量％のＳＯ3 と、4.８重量％
のＡｌ2 Ｏ3 と、1.２重量％の強熱減量と、その他の残
余成分とからなる固化剤を用いるのが良い。本発明によ
り得られた固化物は、所定期間養生されたうえで、その
後の用途に合わせて必要な大きさに破砕された後、例え
ば道路建設用の下層もしくは上層の路盤材、宅地造成用
の盛土、まさ土代用土または埋め戻し土として利用され
る。The solidifying agent used in the present invention comprises, as chemical components, 65 to 70% by weight of CaO, 13 to 16% by weight of SiO 2 , 7 to 9% by weight of SO 3 , and 4 to 6% by weight of Al 2 O 3 and 1-2% by weight loss on ignition
You. Specifically, 67.7% by weight of CaO, 14.4% by weight of SiO 2 , 7.8% by weight of SO 3 , and 4.8% by weight
It is preferable to use a solidifying agent comprising Al 2 O 3 , 1.2% by weight of ignition loss, and other residual components. The solidified product obtained by the present invention is cured for a predetermined period of time, and then crushed to a required size according to the subsequent use, for example, a lower or upper subbase material for road construction, for residential land development. It is used as embankment, Masato soil or backfill soil.
【０００９】なお、固化剤を使用するに当たっては、当
該固化剤に対して重量比で１〜２％の高分子系固化助剤
を併用するのが好ましい。これは、固化剤の効果をより
一層発揮させることができるからである。具体的には、
（１）固化速度が早くなる、（２）粒状化された処理土
が得られる、（３）固化剤の添加量を軽減することがで
きる等の理由による。この場合の高分子系固化助剤とし
ては、ポリアクリルアミドを主成分とし、これに天然植
物性高分子（食品添加物に認定されているもの）を必要
量だけ添加してなる固化助剤があげられる。In using the solidifying agent, it is preferable to use 1 to 2% by weight of a polymer-based solidifying aid in combination with the solidifying agent. This is because the effect of the solidifying agent can be further exhibited. In particular,
(1) The solidification rate is increased, (2) Granulated treated soil is obtained, and (3) The amount of the solidifying agent added can be reduced. Examples of the polymer-based solidification aid in this case include a solidification aid obtained by adding a required amount of a natural vegetable polymer (those certified as a food additive) to polyacrylamide as a main component. Can be
【００１０】[0010]
【作用】本発明において使用される固化剤は、その化学
組成から明らかなように、ＣａＯ、ＳｉＯ2 、Ａｌ2 Ｏ
3 、ＳＯ3 を主成分とするセメント系固化剤であるか
ら、水分を多量に含む建設汚泥に投入すると、セメント
と同様の下記〜のような水和反応を生じる。 ２Ｃ3 Ｓ＋６Ｈ2 Ｏ→３ＣａＯ・２ＳｉＯ2 ・３Ｈ
2 Ｏ＋３Ｃａ（ＯＨ）2 ２Ｃ2 Ｓ＋４Ｈ2 Ｏ→３ＣａＯ・２ＳｉＯ2 ・３Ｈ
2 Ｏ＋ Ｃａ（ＯＨ）2 Ｃ3 Ａ＋３ＣａＳＯ4 ・２Ｈ2 Ｏ→Ｃ3 Ａ・３Ｃ
ａＳＯ4 ・３２Ｈ2 Ｏ ここで、Ｃ3 Ｓ、Ｃ2 ＳおよびＣ3 Ａは、よく知られて
いるように３ＣａＯ・ＳｉＯ2 、２ＣａＯ・ＳｉＯ2 お
よび３ＣａＯ・Ａｌ2 Ｏ3 をそれぞれ示す化合物であ
る。The solidifying agent used in the present invention is, as apparent from its chemical composition, CaO, SiO 2 , Al 2 O
3. Since it is a cement-based solidifying agent containing SO 3 as a main component, when it is put into construction sludge containing a large amount of water, the following hydration reaction similar to that of cement occurs as described below. 2C 3 S + 6H 2 O → 3CaO · 2SiO 2 · 3H
2 O + 3Ca (OH) 2 2C 2 S + 4H 2 O → 3CaO · 2SiO 2 · 3H
2 O + Ca (OH) 2 C 3 A + 3CaSO 4 .2H 2 O → C 3 A.3C
aSO 4 · 32H 2 O where, C 3 S, C 2 S and C 3 A may known as 3CaO · SiO 2, 2CaO · SiO 2 and 3CaO · Al 2 O 3 with compound respectively is there.
【００１１】一般にセメントの水和反応は上記〜の
反応を主体とするが、本発明において使用される固化剤
では、これらと並行して更に下記およびの反応が進
行する。 ３Ｃａ（ＯＨ）2 ＋Ａｌ2 Ｏ3 ＋３ＣａＳＯ4 ・２
Ｈ2 Ｏ＋２３Ｈ2 Ｏ→Ｃ3 Ａ・３ＣａＳＯ4 ・３２Ｈ2
Ｏ ２Ｃａ（ＯＨ）2 ＋Ａｌ2 Ｏ3 ＋ＳｉＯ2 ＋６Ｈ2
Ｏ→２ＣａＯ・Ａｌ2 Ｏ3 ・ＳｉＯ2 ・８Ｈ2 ＯIn general, the hydration reaction of cement mainly comprises the above-mentioned reactions. However, in the solidifying agent used in the present invention, the following reactions further proceed in parallel therewith. 3Ca (OH) 2 + Al 2 O 3 + 3CaSO 4 · 2
H 2 O + 23H 2 O → C 3 A ・ 3CaSO 4・ 32H 2
O 2Ca (OH) 2 + Al 2 O 3 + SiO 2 + 6H 2
O → 2CaO · Al 2 O 3 · SiO 2 · 8H 2 O
【００１２】建設汚泥に固化剤を添加すると、上記、
のような反応で生成するＣＳＨゲルやＣａ（ＯＨ）2
等によって土粒子相互が結合される。こうして結合した
土粒子は、またはの反応によって生成するエトリン
ガイトの針状の結晶により補強され、難溶性の水和物と
なって析出・硬化する。これにより、雨水などに曝され
てもＣａ+2、ＯＨ- などのイオンが溶出しない固形物
（汚泥処理物）が得られる。このようにして得られた固
化物は、所定期間養生されたうえで、用途に応じて所定
の大きさに破砕された後、土木・建設現場において資材
ないし再生土として供される。その場合、処理前の汚泥
中に含まれていた有機物質や有害物質は、固化物中に封
じ込められているので、土木・建設用の資材ないし再生
土として供された固化物あるいはその破砕物から汚泥独
特の臭いが発生したり有害物質が流出したりすることも
ない。When a solidifying agent is added to construction sludge,
CSH gel or Ca (OH) 2 formed by a reaction such as
Thus, the soil particles are connected to each other. The thus-bonded soil particles are reinforced by needle-like crystals of ettringite generated by the above reaction, and are precipitated and hardened as hardly soluble hydrates. As a result, a solid (sludge treated product) from which ions such as Ca +2 and OH − do not elute even when exposed to rainwater or the like is obtained. The solidified material thus obtained is cured for a predetermined period, crushed to a predetermined size according to the intended use, and then provided as a material or recycled soil at a civil engineering / construction site. In this case, since the organic and harmful substances contained in the sludge before treatment are contained in the solidified material, the solidified material provided as civil engineering / construction material or recycled soil or its crushed material There is no smell peculiar to sludge and no harmful substances leak out.
【００１３】[0013]
【発明の効果】本発明によれば、建設汚泥を、汚泥の臭
いがせず且つ有害物質等が流出しない固化物に簡単に変
えることができるから、この固化物（汚泥処理物）を、
例えば埋め戻し土や路盤材あるいは宅地造成用の盛土等
として用いることができる。これにより、従来そのまま
廃棄処分されていた建設汚泥を、天然土や天然石に代わ
る有用な土木・建設用の資材ないし再生土として再利用
することが可能となる。その際、再利用された汚泥処理
物からは、雨水等に曝されてもＣａ+2やＯＨ- などのア
ルカリ成分が溶出することがないから、汚泥処理物を再
利用する場合に従来のように固化処理後にアルカリ成分
の溶出を防止する処理を別途行うといった必要がなく、
その分だけ処理コストを抑えることができる。According to the present invention, construction sludge can be easily changed to a solidified substance which does not smell sludge and does not allow harmful substances to flow out.
For example, it can be used as backfill soil, roadbed material, embankment for residential land development, and the like. This makes it possible to reuse construction sludge, which has been conventionally disposed of as it is, as useful civil and construction materials or recycled soil in place of natural soil and natural stone. At that time, the sludge treated product is recycled, when exposed to rain water or the like also Ca +2 and OH - from the alkali component such as there is no possibility to elute, as in the prior art when reusing sludge treated It is not necessary to separately perform a treatment to prevent the elution of the alkali component after the solidification treatment,
The processing cost can be reduced accordingly.
【００１４】[0014]
【実施例】この実施例は、建設汚泥を固化処理すること
により、埋め戻し材として再利用可能な汚泥処理物（固
化物）を得る場合に関する。 （１） 固化剤 本実施例で使用した固化剤Ｘの化学成分を表１に示す。EXAMPLE 1 This example relates to a case where a sludge treated material (solidified material) which can be reused as a backfill material is obtained by solidifying construction sludge. (1) Solidifying agent Table 1 shows the chemical components of the solidifying agent X used in this example.
【００１５】[0015]
【表１】 [Table 1]
【００１６】（２） 予備サンプルの調整 サンプル原料として、脱水後の含水率が６７％のベント
ナイト汚泥（以下、汚泥）と、粒径が１０mm以下の建設
残土（以下、残土）と、粒径が１０〜１５mmのクラッシ
ャーランとを用意し、これらを表２のように配合してＡ
・Ｂ・Ｃの三種類の予備サンプルを作成した。同表にお
いて、「％」は重量％を意味する。(2) Preparation of Preliminary Samples As sample raw materials, bentonite sludge (hereinafter referred to as sludge) having a water content of 67% after dehydration, construction residual soil (hereinafter referred to as residual soil) having a particle size of 10 mm or less, and particle size A crusher run of 10 to 15 mm was prepared, and these were blended as shown in Table 2 to obtain A.
-Three kinds of preliminary samples of B and C were prepared. In the table, "%" means% by weight.
【００１７】[0017]
【表２】 [Table 2]
【００１８】この場合に用いた残土の分布状況は、２mm
未満のものが５3.１５重量％、２mm以上で５mm未満のも
のが２9.４７重量％、５mm以上で１０mm未満のものが１
7.３８重量％であった。The distribution of the residual soil used in this case is 2 mm
Less than 53.15% by weight, 2mm or more and less than 5mm 29.47% by weight, 5mm or more and less than 10mm 1
7.38% by weight.
【００１９】（３） サンプルの調整 （２）で得た３種類の予備サンプルＡ・Ｂ・Ｃをそれぞ
れ３等分し、その３等分された各予備サンプルごとに、
（１）に示した固化剤Ｘをそれぞれ６％、９％、１２％
ずつ添加・混和して、表３に示す９種類のサンプルを作
成した。このときの混和作業は、プラスチックバケツ
（５０リットル容器）内に各予備サンプルおよび固化剤
Ｘを入れ、数人が５分間連続して手練りすることにより
行った。(3) Sample preparation The three types of preliminary samples A, B, and C obtained in (2) are each divided into three equal parts, and for each of the three equally divided preliminary samples,
6%, 9% and 12% of the solidifying agent X shown in (1) respectively
Each sample was added and mixed to produce nine types of samples shown in Table 3. The mixing operation at this time was performed by putting each preliminary sample and the solidifying agent X in a plastic bucket (50 liter container) and performing hand kneading for 5 minutes continuously by several persons.
【００２０】[0020]
【表３】 [Table 3]
【００２１】（４） 固化後の汚泥処理物の強度 （３）で得た各サンプルを円筒状のモールド（直径１０
０mm、高さ２００mm、容積1.５７リットル）に詰め、そ
の７日目の一軸圧縮強度を測定するとともに換算係数に
よるＣＢＲ値（修正ＣＢＲ値）を求めた。その結果を表
４に示す。(4) Strength of sludge treated material after solidification Each sample obtained in (3) is molded into a cylindrical mold (diameter of 10).
0 mm, height 200 mm, volume 1.57 liters), the uniaxial compressive strength on the seventh day was measured, and the CBR value (corrected CBR value) was calculated by a conversion coefficient. Table 4 shows the results.
【００２２】[0022]
【表４】 [Table 4]
【００２３】（５） 評価 表４を見ると、一軸圧縮強度および修正ＣＢＲ値はサン
プルによってかなりのバラツキがあるが、Ｂ−９・Ｂ−
１２・Ｃ−１２が、固化強度の一応の目安となる修正Ｃ
ＢＲ値１００以上のものとなっている。このことから、
汚泥５０％に残土１５〜２５％とクラッシャーラン２５
〜３５％とを加えたものに、上記固化剤Ｘを重量比で９
％ないし１２％添加すれば、埋め戻し土として十分に利
用可能な汚泥処理物が得られることがわかる。(5) Evaluation Referring to Table 4, the uniaxial compressive strength and the corrected CBR value vary considerably depending on the sample.
12 ・ C-12 is the modified C which is a tentative measure of solidification strength
The BR value is 100 or more. From this,
50 to 25% sludge, 15 to 25% soil and crusher run 25
To 35%, and the solidifying agent X was added in a weight ratio of 9%.
It can be seen that a sludge treatment material that can be sufficiently used as backfill soil can be obtained by adding from 12% to 12%.
【００２４】また、表４に示したいずれのサンプルにつ
いても、Ｃａ+2やＯＨ- などのイオンの溶出および有機
物質や有害物質の流出が認められず、汚泥独特の臭いも
しないことが確認された。これは、各サンプルが難溶性
の水和物であり、処理前の汚泥中に含まれていた有機物
質や有害物質はその水和物中に封じ込められているため
であると考えられる。Moreover, for any of the samples shown in Table 4, Ca +2 and OH - dissolution and outflow of organic substances and harmful substances ions can not be observed, such as, confirmed that neither sludge peculiar smell Was. It is considered that this is because each sample is a hardly soluble hydrate, and the organic and harmful substances contained in the sludge before the treatment are contained in the hydrate.
Claims (1)
なる建設汚泥をリサイクルする方法であって、建設汚泥５０重量％に対し、粒径が１０mm以下の建設残
土１５〜２５重量％と、粒径が１０〜１５mmのクラッシ
ャーラン２５〜３５重量％とを混合し、 この混合物に、６５〜７０重量％のＣａＯと、１３〜１
６重量％のＳｉＯ 2 と、７〜９重量％のＳＯ 3 と、４〜
６重量％のＡｌ 2 Ｏ 3 と、１〜２重量％の強熱減量とを
有する固化剤を、重量比で９〜１２％添加して混和する
ことにより、当該混合物を固化し、 得られた固化物を所定期間養生して、埋め戻し土として
利用可能な汚泥処理物と することを特徴とする建設汚泥
のリサイクル方法。 1. A method for recycling construction sludge containing bentonite sludge or sewage, comprising a construction residue having a particle size of 10 mm or less with respect to 50% by weight of construction sludge.
15-25% by weight of soil and crush with particle size of 10-15mm
25-35% by weight of CaO, and 65-70% by weight of CaO, 13-1%
6% by weight of SiO 2 , 7 to 9% by weight of SO 3 ,
6% by weight of Al 2 O 3 and 1-2% by weight of ignition loss
9 to 12% by weight of the solidifying agent is added and mixed
In this way, the mixture is solidified, and the obtained solidified material is cured for a predetermined period, and is used as backfill soil.
A method for recycling construction sludge, characterized in that the sludge can be used .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17579696A JP3156037B2 (en) | 1996-06-14 | 1996-06-14 | How to recycle construction sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17579696A JP3156037B2 (en) | 1996-06-14 | 1996-06-14 | How to recycle construction sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10495A JPH10495A (en) | 1998-01-06 |
| JP3156037B2 true JP3156037B2 (en) | 2001-04-16 |
Family
ID=16002409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17579696A Expired - Fee Related JP3156037B2 (en) | 1996-06-14 | 1996-06-14 | How to recycle construction sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3156037B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6230090B1 (en) | 1997-01-07 | 2001-05-08 | Hitachi Construction Machinery Co., Ltd. | Interference prevention system for two-piece boom type hydraulic excavator |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1179063B (en) * | 1984-08-20 | 1987-09-16 | Fiat Auto Spa | EQUIPMENT FOR CARRYING OUT TREATMENTS ON METAL PIECES USING A POWER LASER |
| JPS61229389A (en) | 1985-04-03 | 1986-10-13 | イビデン株式会社 | Ceramic wiring plate and manufacture thereof |
| CN110902984A (en) * | 2019-12-05 | 2020-03-24 | 河北诚润环保工程有限公司 | Curing agent for sludge treatment and application thereof |
-
1996
- 1996-06-14 JP JP17579696A patent/JP3156037B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6230090B1 (en) | 1997-01-07 | 2001-05-08 | Hitachi Construction Machinery Co., Ltd. | Interference prevention system for two-piece boom type hydraulic excavator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10495A (en) | 1998-01-06 |
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