JPS59108615A - High-concentration sand slurry transport method - Google Patents
High-concentration sand slurry transport methodInfo
- Publication number
- JPS59108615A JPS59108615A JP21544082A JP21544082A JPS59108615A JP S59108615 A JPS59108615 A JP S59108615A JP 21544082 A JP21544082 A JP 21544082A JP 21544082 A JP21544082 A JP 21544082A JP S59108615 A JPS59108615 A JP S59108615A
- Authority
- JP
- Japan
- Prior art keywords
- sand
- water
- slurry
- sand slurry
- pump
- 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
- 239000004576 sand Substances 0.000 title claims abstract description 68
- 239000002002 slurry Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002562 thickening agent Substances 0.000 claims description 10
- 241000270295 Serpentes Species 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 abstract description 5
- 229920003086 cellulose ether Polymers 0.000 abstract description 4
- 239000004034 viscosity adjusting agent Substances 0.000 abstract 4
- 230000035699 permeability Effects 0.000 abstract 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 6
- 239000010931 gold Substances 0.000 description 6
- 229910052737 gold Inorganic materials 0.000 description 6
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 229920001206 natural gum Polymers 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 description 1
- 229920001612 Hydroxyethyl starch Polymers 0.000 description 1
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920013820 alkyl cellulose Polymers 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 125000004181 carboxyalkyl group Chemical group 0.000 description 1
- 229920003064 carboxyethyl cellulose Polymers 0.000 description 1
- 229920003123 carboxymethyl cellulose sodium Polymers 0.000 description 1
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 1
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 description 1
- 229940063834 carboxymethylcellulose sodium Drugs 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- -1 droxyethylcellulose Polymers 0.000 description 1
- 229920001249 ethyl cellulose Polymers 0.000 description 1
- 235000019325 ethyl cellulose Nutrition 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 229920013821 hydroxy alkyl cellulose Polymers 0.000 description 1
- 229940050526 hydroxyethylstarch Drugs 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 description 1
- 229920013818 hydroxypropyl guar gum Polymers 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 229920003170 water-soluble synthetic polymer Polymers 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 235000010493 xanthan gum Nutrition 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/30—Conveying materials in bulk through pipes or tubes by liquid pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は砂及び砂に類する粒状物を水と混合したスラリ
ー状態で管路を通じて輸送する方法、特に水に対する砂
の混合比（以後金砂率という）が大きい高濃度のサンド
スラリーを輸送する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transporting sand and sand-like granules mixed with water in the form of a slurry through a pipe, and in particular to a method for transporting sand and sand-like granular materials through pipes in the form of a slurry mixed with water. The present invention relates to a method of transporting sand slurry.
従来、砂を水と共に管路内を輸送する場合、例えば海に
防波堤を建設する場合、第１図に示すように海底に設け
た基礎マウンド１上に据付けた蓋付コンクリートケーソ
ン２内に砂を詰めるため、陸上の適当な′場所に設置し
た砂溜槽３の砂にジェットポンプ等で加水しながらこれ
をサンドポンプ４で吸い上げ管５を通じてケーソン２の
注入孔６よりケーソン２内に充填し、余剰水は排水孔７
より排水している。Conventionally, when transporting sand along with water through a pipe, for example when constructing a breakwater in the sea, sand is transported inside a concrete caisson 2 with a lid installed on a foundation mound 1 set on the seabed, as shown in Figure 1. To fill the sand, water is added to the sand in a sand storage tank 3 installed at a suitable location on land using a jet pump, etc., and the water is sucked up by the sand pump 4 and filled into the caisson 2 through the injection hole 6 of the caisson 2 through the injection hole 6 of the caisson 2. Water drain hole 7
It's more draining.
この場合管内を輸送されるサンドスラリーの金砂率は平
均するとｌＯチ〜１５％であり、これ以上の金砂率にな
ると管内に砂が沈澱してついには閉塞を起してしまう。In this case, the gold sand content of the sand slurry transported through the pipe is on average 10 to 15%, and if the gold sand content exceeds this, sand will precipitate inside the pipe, eventually causing blockage.
この原因は砂の透水係数が大きいため、スラリー中の砂
と水とが容易に分離して砂が沈設し、沈澱した砂のＭ線
抵抗によって管路が閉塞されるからである。従ってサン
ドスラリーを前記３０チ以上の高濃度で輸送することが
できないので作業能率が悪く、又砂の容積の７〜１０倍
の水を送るので多周の余剰水が発生し、この定め付近の
海の汚濁の原因となったり、適当な排水処理を施す必要
があり、このための経費を必要とする。The reason for this is that sand has a large hydraulic conductivity, so the sand and water in the slurry are easily separated, the sand settles, and the M-line resistance of the settled sand blocks the pipe. Therefore, it is not possible to transport sand slurry at a high concentration of 30 cm or more, resulting in poor work efficiency.Also, since water is sent 7 to 10 times the volume of sand, surplus water is generated over multiple cycles, It may cause ocean pollution and requires appropriate wastewater treatment, which requires expense.
そこでサンドスラリー中に高分子物質からなる粘性剤を
加えてこれをサンドポンプによつ″Ｃ輸送する方法が考
えられる。この方法によｔ′シはサンドスラリー中の砂
の沈澱が防止できるので、ある程度高含砂率のサンドス
ラリーを輸送できるが、しかしこの方法によっても通常
はこれまでの倍以上例えば金砂率３０％以上のサンドス
ラリーを輸送できるまでには至らず、これまでの倍以上
の金砂率のサントス２リーを輸送するためには極めて大
型のサンドポンプを必要とし不経済であった。Therefore, a method can be considered to add a viscous agent made of a polymer substance to the sand slurry and transport it using a sand pump.This method can prevent the sand from settling in the sand slurry. However, even with this method, it is usually not possible to transport sand slurry with a gold sand content of 30% or more, which is more than twice that of the previous method. Transporting Santos 2 Lee, which has a gold sand content, required an extremely large sand pump, which was uneconomical.
本発明は高濃度でサンドスラリーを輸送する方法を提供
することによって従来の問題を力′ト決するものである
。The present invention overcomes the conventional problems by providing a method for transporting sand slurry at high concentrations.
本発明はビスｉ・ンボンプやスネークポンプを使用する
ことによって小皺のポンプで金砂率の大きいザンドスラ
リーｔｉ浦送できるように］７たことを特徴とする。The present invention is characterized in that by using a screw pump or a snake pump, sand slurry with a large proportion of gold sand can be transported with a small pump.
以下図面によって本発明の詳細な説明する。The present invention will be explained in detail below with reference to the drawings.
本発明におい′″Ｃは輸送すべき砂に水を加えで金砂率
が３０％〜６０係となるようなサンドスラリーを作り、
さらに水溶性セルロースエーテル類の粘、稠剤を加えて
水の粘度（２５℃）が３０センチボイス（ｃｐｓ ）以
上１０００ｅｐａ以下であるものとし、第２図に示すよ
うに従来公知の任意のミキサー８内で混線しで、ピスト
ン式コンクリートポンプ９によって管５内全圧送するよ
うにする。In the present invention, '''C adds water to the sand to be transported to make a sand slurry with a gold sand ratio of 30% to 60%,
Furthermore, the viscosity of water-soluble cellulose ethers and a thickening agent are added so that the viscosity of water (at 25°C) is 30 centibois (cps) or more and 1000 epa or less, and as shown in FIG. The piston-type concrete pump 9 is used to pump the entire inside of the pipe 5 under pressure.
本発明ではサンドスラリー中に高分子粘稠剤を加えるこ
とによって、水の粘性が増し、その結果スラリー中の砂
の見掛は上の進水係数が小さくなるので水と砂が分９Ｗ
せず、従って管路中で砂が沈澱しないので１５９６以上
の高濃度のサンドスラリーでも容易に輸送できる。In the present invention, by adding a polymer thickening agent to the sand slurry, the viscosity of water increases, and as a result, the apparent launch coefficient of the sand in the slurry decreases, so the water and sand are separated by 9 W.
Therefore, even sand slurry with a high concentration of 1596 or more can be easily transported because the sand does not settle in the pipe.
本発明で使用する粘稠剤としては、アルキルセルロース
、ヒドロキシアルキルセルロース、カルボキシアルキル
セルロース、混合セルロースエーテルなどの水溶性セル
ロースエーテル類、天然ガム、変性天然ガム類および水
溶性合成高分子類等が挙げられる。例えば、メチルセル
ロース、エチルセルロース、とドロキシエチルセルロー
ス、ヒドロキシプロピルセルロース、カルボキシメチル
セルロースナｌ−ＩＪ ラム塩（ＣＭＣ’）、カルボキ
シエチルセルロースナトリウム塩、ヒドロキシエチルメ
チルセルロース、ヒドロキシグロビルメチルセルロース
、カルボキシメチルヒドロキシエチルセルロース、アル
ギン酸ソーダ、グアガム、ヒドロキシプロピルグアガム
、ザンサンガム、カルボキシメチルデンプン、ヒドロキ
シエチルデンプンホリビニルアルコール、ポリアクリル
酸、ポリアクリル酸ソーダ、ポリアクリルアミド、ポリ
エチレンオキサイドなどである。これらを単独でも、２
種以上全混合して用いてもよい。Examples of the thickening agent used in the present invention include water-soluble cellulose ethers such as alkyl cellulose, hydroxyalkyl cellulose, carboxyalkyl cellulose, and mixed cellulose ethers, natural gums, modified natural gums, and water-soluble synthetic polymers. It will be done. For example, methylcellulose, ethylcellulose, droxyethylcellulose, hydroxypropylcellulose, carboxymethylcellulose sodium rum salt (CMC'), carboxyethylcellulose sodium salt, hydroxyethylmethylcellulose, hydroxyglobil methylcellulose, carboxymethylhydroxyethylcellulose, sodium alginate, These include guar gum, hydroxypropyl guar gum, xanthan gum, carboxymethyl starch, hydroxyethyl starch, polyvinyl alcohol, polyacrylic acid, sodium polyacrylate, polyacrylamide, and polyethylene oxide. Even if these alone, 2
It is also possible to use a complete mixture of two or more species.
粘稠剤の添加付は、粘稠剤を配合した水の粘度が３０
ｃｐｓ以上１０００ ｃｐｓ以下となるように選べばよ
く、粘稠剤として用いる水溶性高分子の種類と重合度に
よって異なるが、通當水に対して０．０５〜１０重量％
程度、好ましくはｏ、ｉ〜１．０重位憾程度添加すれは
よい。粘稠剤を配合した水の粘度が３０ｃｐＢ以下の場
合には、もはやポンプで輸送することが困難となり、逆
に１０００ｃｐａ以上になるとポンプのｉ）ｉ′安動力
が大きく、また多量の粘稠剤の注加が必要となり経済性
が失われる。When adding a thickening agent, the viscosity of the water containing the thickening agent is 30.
cps or more and 1000 cps or less, and varies depending on the type and degree of polymerization of the water-soluble polymer used as a thickening agent, but is generally 0.05 to 10% by weight based on the water.
It may be added to a certain degree, preferably about 0.0 to 1.0 times. If the viscosity of water containing a thickening agent is less than 30 cpB, it will be difficult to transport by pump, and if it exceeds 1000 cpa, the pump's stability will be large and a large amount of thickening agent will be used. It is necessary to add 20% of the total amount of water, which results in a loss of economic efficiency.
本発明方法は上記の辿りであるから下記のような効果か
得られる。Since the method of the present invention follows the above steps, the following effects can be obtained.
１）サンドスラリーの中の水の脱水が防がれ、従って砂
の沈澱、ＩＡ象が防止され高濃度スラリーの輸送が司能
となる。1) Dehydration of water in the sand slurry is prevented, and therefore sand sedimentation and IA phenomenon are prevented, and the transportation of highly concentrated slurry is facilitated.
２）サンドスラリー中の含砂率全４すに５０％〜６０％
としたとき、輸送されグこ水は翰送後の砂容積中の空隙
を満すようになるので外部へ余剰水として出ることはな
い。2) Sand content in sand slurry: 50% to 60%
When this happens, the transported water will fill the voids in the sand volume after being transported, so it will not flow out as excess water.
３）サンドスラリーによって空隙等を充填する場合、高
分子成分が流動性（モクソトロピー性）を高めるため非
常に小さな空隙にも充填できる（グラウトと同等の機能
を与え得る）尚、本発明方法は前記蓋付コンクリートケ
ーソンの充填に限らず以下の事項に適用することができ
る。3) When filling voids etc. with sand slurry, the polymer component increases fluidity (moxotropy), so even very small voids can be filled (can provide the same function as grout). It can be applied not only to filling concrete caissons with lids but also to the following matters.
１）河川堤防の法面保饅や防波堤の捨石基礎の洗掘防止
のために敷設する帆布製マットすなわち直径１０ｃｒｎ
〜５０ｃｒｎ程度の円筒状シートを連設したマットへの
砂の充填。1) Canvas mats (diameter 10 crn) laid to protect the slopes of river embankments and prevent scouring of rubble foundations of breakwaters.
Filling a mat with cylindrical sheets of approximately 50 crn with sand.
２）地盤沈下によって生じた建設物下面と地盤表面とに
形成された空隙、又は各種地中空隙部への充填、埋戻し
。2) Filling and backfilling voids formed between the underside of a construction and the ground surface due to ground subsidence, or various underground voids.
３）軟弱地盤中に盛土を行うために地盤表面に敷設する
敷設材すなわち帆布シートの裏面に円筒状袋を複数本縫
い合せた敷設材の円筒状袋内への充填。3) Filling a cylindrical bag with a laying material to be laid on the ground surface for embankment in soft ground, that is, a laying material made by sewing multiple cylindrical bags on the back of a canvas sheet.
４）岸壁等を建設するための鋼管矢板のジヨイントパイ
プ内への充填。4) Filling joint pipes with steel pipe sheet piles for constructing quays, etc.
又、前記ピストン式コンクリートポンプとしては例えば
新潟鉄工体製の［”ニイガタ・トムセンコンクリートポ
ンプ」（商標）や回転容積型の一軸偏心ネジポンプ、例
えばモーノポンプ（商標）その他スネークポンプを用い
ても良い。Further, as the piston type concrete pump, for example, a "Niigata Thomsen Concrete Pump" (trademark) manufactured by Niigata Tekkotai, a rotary displacement type uniaxial eccentric screw pump, such as a mono pump (trademark), or a snake pump may be used.
第１図は蓋付コンクリートケーソンを充填する場合の従
来方法の説明図、第２図は本発明方法の説明図である。
１・・・基礎マウンド、２・・・ケーソン、３・・・砂
溜槽、４・・・サンドポンプ、５・・・管、６・・・注
入孔、７・・・排水孔、８・・・ミキサー、９・・・コ
ンクリートポンプ。
代理人 弁理士 洲 本 誠 −FIG. 1 is an explanatory diagram of a conventional method for filling a concrete caisson with a lid, and FIG. 2 is an explanatory diagram of the method of the present invention. 1...Foundation mound, 2...Caisson, 3...Sand tank, 4...Sand pump, 5...Pipe, 6...Injection hole, 7...Drain hole, 8...・Mixer, 9...Concrete pump. Agent Patent Attorney Makoto Sumoto −
Claims (4)
リー全ボングで輸送することを特徴とする高爵度サンド
スラリーの輸送方法。(1) A method for transporting high-grade sand slurry, which is characterized by transporting a highly concentrated sand slurry of water and sand mixed with a thickening agent in a bong.
チボイス（ｃｐｓ）以上１０００ ｃｐｓ以下であるも
のを用いることを特徴とする特許請求の範囲第１項記載
の高濃度サンドスラリーの輸送方法。(2) The high-concentration sand slurry according to claim 1, characterized in that water containing a thickening agent and having a viscosity (at 25° C.) of 30 centivoices (cps) or more and 1000 cps or less is used. transportation method.
である特許請求の範囲第１項又は第２項記載の高濃度サ
ンドスラリーの輸送方法。(3) The method for transporting high-concentration sand slurry according to claim 1 or 2, wherein the pump is a piston type concrete pump.
の範囲第１項又は第２項記載の高濃度サンドスラリーの
輸送方法。(4) The method for transporting high concentration sand slurry according to claim 1 or 2, wherein the pump is a snake pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21544082A JPS59108615A (en) | 1982-12-10 | 1982-12-10 | High-concentration sand slurry transport method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21544082A JPS59108615A (en) | 1982-12-10 | 1982-12-10 | High-concentration sand slurry transport method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59108615A true JPS59108615A (en) | 1984-06-23 |
Family
ID=16672379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21544082A Pending JPS59108615A (en) | 1982-12-10 | 1982-12-10 | High-concentration sand slurry transport method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59108615A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414411A (en) * | 2017-12-27 | 2018-08-17 | 华北理工大学 | The carefully big pipeline concentration gradient monitoring device of tailing-filled slurry and method |
| JP2022001712A (en) * | 2020-06-22 | 2022-01-06 | エースコン工業株式会社 | Method for pumping washed sand |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS559695A (en) * | 1978-07-03 | 1980-01-23 | Union Carbide Corp | Transporting aqueous coal slurry |
-
1982
- 1982-12-10 JP JP21544082A patent/JPS59108615A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS559695A (en) * | 1978-07-03 | 1980-01-23 | Union Carbide Corp | Transporting aqueous coal slurry |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108414411A (en) * | 2017-12-27 | 2018-08-17 | 华北理工大学 | The carefully big pipeline concentration gradient monitoring device of tailing-filled slurry and method |
| CN108414411B (en) * | 2017-12-27 | 2020-05-12 | 华北理工大学 | Device and method for monitoring concentration gradient of fine tailings filling slurry in large pipeline transportation |
| JP2022001712A (en) * | 2020-06-22 | 2022-01-06 | エースコン工業株式会社 | Method for pumping washed sand |
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