JPH02145680A - Moisture-expansive demolition agent composition - Google Patents
Moisture-expansive demolition agent compositionInfo
- Publication number
- JPH02145680A JPH02145680A JP30027588A JP30027588A JPH02145680A JP H02145680 A JPH02145680 A JP H02145680A JP 30027588 A JP30027588 A JP 30027588A JP 30027588 A JP30027588 A JP 30027588A JP H02145680 A JPH02145680 A JP H02145680A
- Authority
- JP
- Japan
- Prior art keywords
- water
- calcium oxide
- retaining
- crushing
- hydration
- 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.)
- Pending
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000292 calcium oxide Substances 0.000 claims abstract description 24
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 abstract description 8
- 238000006703 hydration reaction Methods 0.000 abstract description 7
- 229920001577 copolymer Polymers 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002156 mixing Methods 0.000 abstract description 3
- 239000011435 rock Substances 0.000 abstract description 3
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 abstract description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 abstract description 2
- 229920006322 acrylamide copolymer Polymers 0.000 abstract description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 2
- -1 etc. Substances 0.000 abstract description 2
- 229920000058 polyacrylate Polymers 0.000 abstract description 2
- 229940047670 sodium acrylate Drugs 0.000 abstract description 2
- SKMHHHHLLBKNKR-UHFFFAOYSA-M sodium;prop-2-enamide;prop-2-enoate Chemical compound [Na+].NC(=O)C=C.[O-]C(=O)C=C SKMHHHHLLBKNKR-UHFFFAOYSA-M 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 4
- NPERTKSDHFSDLC-UHFFFAOYSA-N ethenol;prop-2-enoic acid Chemical compound OC=C.OC(=O)C=C NPERTKSDHFSDLC-UHFFFAOYSA-N 0.000 description 3
- 239000002360 explosive Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002775 capsule Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229940048053 acrylate Drugs 0.000 description 1
- 150000001339 alkali metal compounds Chemical class 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- YPSVSPBXPRTRQF-UHFFFAOYSA-N calcium;oxygen(2-);hydrate Chemical class O.[O-2].[Ca+2] YPSVSPBXPRTRQF-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
Abstract
Description
本発明は、コンクリートなどの構造物や岩石を水和反応
による膨張圧を利用して破砕する破砕剤組成物に関する
ものである。TECHNICAL FIELD The present invention relates to a crushing agent composition for crushing structures such as concrete and rocks using expansion pressure caused by a hydration reaction.
従来よりコンクリートなどの構造物や岩石を破砕するに
は、爆薬や大型重機を用いる方法、水和膨張性破砕剤を
用いる方法がある。爆薬や大型重機を用いる方法は破砕
速度が速く作業効率が良い、しかし、爆薬は爆発音が大
きく危険性が高く、大型重機を用いる方法は、機械が大
型のために騒音、振動が発生するという問題があり、共
に使用場所が限定される。
これに対し水和膨張性破砕剤は、水和反応によって膨張
する物質と水とを混合して被破砕物の穿孔に充填するだ
けで良い、所定時間後、破砕剤が膨張し、穿孔内で高圧
を発生するため騒音が発生せず被破砕物を簡単に破砕す
ることが出来る。
水和膨張性破砕剤に用いる組成物は、酸化カルシウムを
主成分として、これに少量の酸化珪素、酸化鉄、酸化ア
ルミニウム、その他アルカリ金属酸化物などを添加した
ものである。酸化カルシウムの組成比率は使用温度に応
じて設定されており、高温では約７５重量％、低温では
約９０重量％である。
破砕剤組成物の形状は１例えば粉末状や顆粒状、粉塊状
で、使用の際に酸化カルシウム全量との反応に必要な水
を混合する。具体的には水と混練して高粘度のスラリー
状にしたり、通水性のカプセルや袋などに詰めておき、
カプセルごと水に浸漬して含水させたものを穿孔に充填
する。
破砕剤の使用時における酸化カルシウムに対する水の混
合比（水比）は、酸化カルシウム１００重量％に対する
外削計算で２４〜２９重量％になる０組成物中に酸化カ
ルシウム以外にも例えばアルカリ金属化合物のような水
と反応する物質も含まれているためである。
酸化カルシウムは水と接触すると急激な発熱反応を起こ
し水酸化カルシウムに変化して体積が増大するが、破砕
剤に用いる酸化カルシウムは他の物質で表面をコーティ
ングすることによって反応速度が緩和、調整されている
。破砕剤組成物は適量の水と混合すると約１２時間で実
用的な膨張圧ギ発生し、破砕作業が可能になる。
特開昭５９−３３３７８号公報には酸化カルシウムを主
体とし、反応性の金属粉を添加した組成の破砕材が開示
されている。また、特開昭６０−１４１９６７号公報お
よび特開昭６０−２５８３９９号公報には酸化カルシウ
ムを用いた破砕方法が開示されている。Conventionally, there are methods to crush structures such as concrete and rocks, using explosives, large heavy machinery, and hydration-swelling crushing agents. Methods using explosives and large heavy machinery have a fast crushing speed and good work efficiency, but explosives make a loud explosion and are highly dangerous, and methods using large heavy machinery generate noise and vibration due to the large size of the machines. There are problems and the places where they can be used are limited. On the other hand, with a hydration-swellable crushing agent, all you have to do is mix water with a substance that expands through a hydration reaction and fill it into the boreholes of the object to be crushed. Since high pressure is generated, objects to be crushed can be easily crushed without generating noise. The composition used for the hydration-swellable crushing agent has calcium oxide as its main component, to which small amounts of silicon oxide, iron oxide, aluminum oxide, and other alkali metal oxides are added. The composition ratio of calcium oxide is set depending on the usage temperature, and is approximately 75% by weight at high temperatures and approximately 90% by weight at low temperatures. The crushing agent composition may be in the form of a powder, granules, or lumps, and water necessary for the reaction with the total amount of calcium oxide is mixed with the composition before use. Specifically, it is mixed with water to form a highly viscous slurry, or packed in water-permeable capsules or bags.
The whole capsule is immersed in water to become hydrated and then filled into the hole. When using the crushing agent, the mixing ratio (water ratio) of water to calcium oxide is 24 to 29% by weight based on external cutting calculations based on 100% by weight of calcium oxide.In addition to calcium oxide, for example, an alkali metal compound may be present in the composition. This is because it also contains substances that react with water, such as. When calcium oxide comes into contact with water, it undergoes a rapid exothermic reaction and changes to calcium hydroxide, increasing its volume. However, the reaction rate of calcium oxide used as a crushing agent can be slowed and adjusted by coating the surface with other substances. ing. When the crushing agent composition is mixed with an appropriate amount of water, it generates a practical expansion pressure in about 12 hours, making crushing work possible. Japanese Unexamined Patent Publication No. 59-33378 discloses a crushed material having a composition mainly composed of calcium oxide and containing reactive metal powder. Furthermore, Japanese Patent Laid-Open Nos. 60-141967 and 60-258399 disclose crushing methods using calcium oxide.
ところが、含水させた破砕剤を被破砕物の穿孔に充填す
ると、破砕剤中の水分が穿孔内壁のクラックなどに吸収
され、反応に必要な水が不足することがある。また、被
破砕物の強度が低く膨張初期の圧力で新たなりラックが
発生した場合、水の逸散量はさらに増加し、未反応の酸
化カルシウムが必要とする水が失なわれてしまう。水和
膨張性破砕剤の反応は固体と水との反応であるために、
その混合割合が当量であっても水の一部は遊離している
からである。特に破砕剤と水とを混合した当初は水の殆
どが遊離して逸散し易い状態になっている。このように
水が不足すると必要な膨張圧が得られない、 ′Ｉｔ７
．破砕物は多少のクラックが生じる程度に留まり３破砕
作業後に行なう小割作業を簡略化するには至らない。
このような水の不足を防止するために予め水を大目に混
合することが考えられるが、単位体積当りの酸化カルシ
ウム量が少な（なり、充分な膨張圧が得られない。
本発明は前記の課題を解決するためなされたもので、水
が逸散することな（全ての水和反応に必要な水を保持し
、充分な膨張圧を得ることが出来る水和膨張性破砕剤組
成物を提供することを目的とする。However, when a crushing agent containing water is filled into the perforations of an object to be crushed, the water in the crushing agent is absorbed into cracks on the inner walls of the perforations, resulting in a shortage of water necessary for the reaction. Furthermore, if the strength of the material to be crushed is low and a new rack is generated due to the pressure at the initial stage of expansion, the amount of water lost will further increase, and the water required by unreacted calcium oxide will be lost. Since the reaction of hydration-swellable crushing agents is a reaction between solid and water,
This is because even if the mixing ratio is equivalent, part of the water is liberated. In particular, when the crushing agent and water are first mixed, most of the water is liberated and is likely to escape. If there is a lack of water in this way, the necessary expansion pressure cannot be obtained, 'It7
．． The crushed material remains to the extent that some cracks occur, and it is not possible to simplify the subdivision operation performed after the third crushing operation. In order to prevent such water shortage, it is possible to mix a large amount of water in advance, but the amount of calcium oxide per unit volume is small (and sufficient expansion pressure cannot be obtained. This was developed to solve the problem of hydration-swelling crushing agent composition that can retain the water necessary for all hydration reactions and obtain sufficient expansion pressure without water escaping. The purpose is to provide.
【課題を解決するための手段］
前記の目的を達成するためになされた本発明の水和膨張
性破砕剤組成物は、水和膨剤剤を主成分とし、その水和
膨張剤１００重量部に対して水４９〜２９重量部を保持
する保水性物質を含んでいる。
保水性物質は自重以上の純水を吸水するもので、塩水溶
液では、例えばアクリル酸ビニルアルコール共重合体（
住人化学■製、スミカゲル５Ｐ−５１０，吸水率６０倍
）、アクリル酸ソーダ重合体′（住人化学■製、スミカ
ゲルＮＰ−１０１０，吸水率８０倍）、アクリル酸ソー
ダーアクリルアミド共重合体（吸水率２０（ｏ）、ポリ
エチレンオキサイド変性物（住友化学■製、スミカゲル
Ｒ−２０Ｆ、吸水率１５倍）、アクリル酸デンプン共重
合体（吸水率１０倍）、インブチレン−無水マレイン酸
共重合体（■クラレ製、ＫＩゲル３０１に、吸水率２０
０倍）が使用出来る。
酸化カルシウム以外の組成物成分としては１例えば、酸
化珪素、酸化鉄、酸化アルミニウムなどの金属酸化物で
ある。これらの形状は、粉末、顆粒または繊維状など任
意である。この他にも、破砕条件に合わせて各種金属や
セメント成分を混合しても良い。
保水性物質が保持する水の量は、酸化カルシウム ＋０
０重量部に対して５〜２０重量部である。保水量が５重
量部以下のときは水和反応が不十分になる。２０重量部
以上のときは、組成物の体積に対する酸化カルシウムが
占める割合が小さくなり、充分な膨張圧が得られない。
【作用】
破砕剤組成物に水を含浸させると、保水性物質は水を吸
収し、酸化カルシウム全量の反応に必要な水量を保持す
る。組成物を被破砕物の穿孔に充填した場合でも、大部
分の水は保水性物質に保持されているため、クラック等
へ逸散することがない、酸化カルシウムはその表面が水
と反応するに従って膨張し、系中のＭ離水骨が減少して
水を含んだ保水性物質から水を徐々に放出させる。酸化
カルシウムは膨張によって新たな表面が露出し、保水性
物質から放出された水と反応して膨張を続け、穿孔の内
壁を押圧する。すると穿孔の周囲から被破砕物に多数の
クラックが入って強度が低下し、遂には崩壊する。[Means for Solving the Problems] The hydration-swellable crushing agent composition of the present invention, which has been made to achieve the above object, contains a hydration-swelling agent as a main component, and contains 100 parts by weight of the hydration-swelling agent. Contains a water-retaining substance that retains 49 to 29 parts by weight of water. Water-retentive substances absorb more pure water than their own weight, and in salt aqueous solutions, for example, acrylic acid vinyl alcohol copolymer (
Sumikagel 5P-510 (manufactured by Sumika Kagaku ■, water absorption rate 60 times), sodium acrylate polymer' (manufactured by Sumika Gel NP-1010, water absorption rate 80 times), sodium acrylate acrylamide copolymer (water absorption rate 20 times) (o), modified polyethylene oxide (manufactured by Sumitomo Chemical ■, Sumikagel R-20F, water absorption rate 15 times), starch acrylate copolymer (water absorption rate 10 times), imbutylene-maleic anhydride copolymer (■ Kuraray Manufactured by KI Gel 301, water absorption rate 20
0x) can be used. Examples of composition components other than calcium oxide include metal oxides such as silicon oxide, iron oxide, and aluminum oxide. These shapes may be arbitrary, such as powder, granules, or fibers. In addition, various metals and cement components may be mixed depending on the crushing conditions. The amount of water retained by water-retentive substances is calcium oxide +0
The amount is 5 to 20 parts by weight relative to 0 parts by weight. When the amount of water retained is less than 5 parts by weight, the hydration reaction will be insufficient. When the amount is 20 parts by weight or more, the ratio of calcium oxide to the volume of the composition becomes small, and sufficient expansion pressure cannot be obtained. [Operation] When the crushing agent composition is impregnated with water, the water-retaining substance absorbs the water and retains the amount of water necessary for the reaction of the entire amount of calcium oxide. Even when the composition is filled into the perforations of the object to be crushed, most of the water is retained in the water-retaining substance, so it will not escape into cracks, etc. Calcium oxide will react with water as its surface reacts with water. It expands, and the M-synopsis in the system decreases, causing water to be gradually released from the water-containing water-retentive material. The calcium oxide expands to expose new surfaces, reacts with water released from the water-retaining material, continues to expand, and presses against the inner wall of the perforation. As a result, many cracks appear in the material to be crushed around the perforation, its strength decreases, and it eventually collapses.
以下、本発明の実施例を詳細に説明する。比較例は本発
明を適用外の・例である。
粉塊状の破砕剤（日曲技研工業■製、商品名カームマイ
トバルクＳ型）に保水性物質０．５重量％を添加し、ハ
ンドミキサを用いて均一に混合し′て水和膨張性破砕剤
組成物を調整する。続いてこの組成物に所定量の水（２
０℃）を加え、保水性物質に吸水、保持させ、スラリー
状にする。このスラリー状の破砕剤組成物を、縦横９０
Ｏｒ＠ｍ、高さ１０００ｍｍの無筋コンクリートに形成
された直径３８ｍｍ１、深さ６００ｍｍの穿孔に充填し
、１２時間経過後のクラックの発生状態を観察する。外
気温度は２５℃、孔内温度は２１”Ｃである。
各実施例および比較例の実験はすべて２回ずつ繰り返し
た。第１表に保水性物質種、水比（外割重迅％）、１２
時間経過後のクラックの発生状態を示す。
（以下余白）
第 １ 表
なお、上記の実施例ではｍ−の保水性物質を添加したが
、複数種の物質を添加しても構わない。Examples of the present invention will be described in detail below. Comparative examples are examples to which the present invention is not applicable. Add 0.5% by weight of a water-retaining substance to a powder-like crushing agent (manufactured by Nichikyugiken Kogyo ■, trade name: Calmite Bulk S type), and mix it uniformly using a hand mixer to obtain hydration-swellable crushing. Adjust the agent composition. Subsequently, a predetermined amount of water (2
0°C), and the water-retaining substance absorbs and retains water to form a slurry. This slurry-like crushing agent composition was
Or@m, a hole with a diameter of 38 mm and a depth of 600 mm formed in unreinforced concrete with a height of 1000 mm was filled, and the state of crack generation was observed after 12 hours had elapsed. The outside temperature is 25°C, and the inside temperature is 21"C. All experiments in each example and comparative example were repeated twice. Table 1 shows the water-retaining substance types and water ratio (external weight/distance %). , 12
This figure shows the state of crack occurrence after the lapse of time. (The following is a blank space) Table 1 Note that in the above example, an m-water retaining substance was added, but a plurality of types of substances may be added.
以上、詳細に説明したように本発明の水和膨張性破砕剤
組成物は、組成物中の保水性物質によって全ての水和反
応に必要な水を保持することが出来る０組成物が被破砕
物の穿孔に充填された際でも、保持された水は被破砕物
のクラックに逸散することがなく、酸化カルシウムと水
との比率が適正に保たれる。そのため、酸化カルシウム
の全量が水和膨張し、充分な膨張圧を得ることが出来、
高い破砕効果が得られる。As explained above in detail, the hydration-swellable crushing agent composition of the present invention is capable of retaining water necessary for all hydration reactions due to the water-retaining substance in the composition. Even when the water is filled into the perforations of an object, the retained water does not escape into the cracks of the object to be crushed, and the ratio of calcium oxide to water is maintained at an appropriate level. Therefore, the entire amount of calcium oxide hydrates and expands, and sufficient expansion pressure can be obtained.
A high crushing effect can be obtained.
Claims (1)
１００重量部に対して水５〜２０重量部を保持する保水
性物質を含むことを特徴とする水和膨張性破砕剤組成物
。1. A hydration-swellable crushing agent composition containing calcium oxide as a main component and containing a water-retaining substance that retains 5 to 20 parts by weight of water per 100 parts by weight of the calcium oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30027588A JPH02145680A (en) | 1988-11-28 | 1988-11-28 | Moisture-expansive demolition agent composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30027588A JPH02145680A (en) | 1988-11-28 | 1988-11-28 | Moisture-expansive demolition agent composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02145680A true JPH02145680A (en) | 1990-06-05 |
Family
ID=17882830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30027588A Pending JPH02145680A (en) | 1988-11-28 | 1988-11-28 | Moisture-expansive demolition agent composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02145680A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002036900A1 (en) * | 2000-10-30 | 2002-05-10 | Yamax Corp. | Expansion joint and reinforcement connection method using the expansion joint |
| JP2010519496A (en) * | 2007-02-23 | 2010-06-03 | ルスピウ | Cutting device with control trigger |
| CN104356293A (en) * | 2014-10-24 | 2015-02-18 | 广西电网公司电力科学研究院 | Formula of grounding resistance reducing agent for mountainous rock and blasting construction method |
-
1988
- 1988-11-28 JP JP30027588A patent/JPH02145680A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002036900A1 (en) * | 2000-10-30 | 2002-05-10 | Yamax Corp. | Expansion joint and reinforcement connection method using the expansion joint |
| US7003921B2 (en) | 2000-10-30 | 2006-02-28 | Yamax Corp. | Expansion joint and reinforcement connection method using the expansion joint |
| JP2010519496A (en) * | 2007-02-23 | 2010-06-03 | ルスピウ | Cutting device with control trigger |
| CN104356293A (en) * | 2014-10-24 | 2015-02-18 | 广西电网公司电力科学研究院 | Formula of grounding resistance reducing agent for mountainous rock and blasting construction method |
| CN104356293B (en) * | 2014-10-24 | 2016-11-30 | 广西电网公司电力科学研究院 | A kind of grounding resistance-reducing agent prescription for mountain area rock and blasting construction method |
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