JPH03213796A - Method and tool for shutting off fluid conduit - Google Patents
Method and tool for shutting off fluid conduitInfo
- Publication number
- JPH03213796A JPH03213796A JP2007755A JP775590A JPH03213796A JP H03213796 A JPH03213796 A JP H03213796A JP 2007755 A JP2007755 A JP 2007755A JP 775590 A JP775590 A JP 775590A JP H03213796 A JPH03213796 A JP H03213796A
- Authority
- JP
- Japan
- Prior art keywords
- bag
- fluid conduit
- blocking
- shutoff
- polymer compound
- 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
- 239000012530 fluid Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000000903 blocking effect Effects 0.000 claims description 44
- 150000001875 compounds Chemical class 0.000 claims description 29
- 229920000247 superabsorbent polymer Polymers 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000002250 absorbent Substances 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 abstract description 2
- 229920002521 macromolecule Polymers 0.000 abstract 5
- 229940125898 compound 5 Drugs 0.000 abstract 2
- -1 alcohol compound Chemical class 0.000 abstract 1
- 230000008602 contraction Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000002955 isolation Methods 0.000 description 12
- 238000010276 construction Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Pipe Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、流体導管の内部に遮断用バッグを収縮状態で
入れ、その遮断用バッグを内部注水により膨張させ、そ
の膨張した遮断用バッグにより前記流体導管の内部を遮
断する方法、並びに、それに使用する流体導管用遮断具
に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention involves placing a cut-off bag in a contracted state inside a fluid conduit, inflating the cut-off bag by internal water injection, and using the expanded cut-off bag to The present invention relates to a method of blocking the inside of the fluid conduit, and a fluid conduit shutoff device used therein.
２従来の技術〕
従来、単に注入した水で遮断用バッグを膨張させ、遮断
用バッグを水圧で流体導管の内面に押付けていた。2. Prior Art Conventionally, a blocking bag was simply inflated with injected water, and the blocking bag was pressed against the inner surface of a fluid conduit using water pressure.
１発明か解決しようとする課題：
しかし、流体導管に遮断用バッグを入れる作業を容易に
するため、遮断用バッグを比較的薄肉に形成して十分に
小さく収縮できるようにすると、流体導管の内面に突起
物が存在して、遮断用バッグにピンホールなどの損傷が
生じ、遮断用バッグを十分強（流体導管に押付けること
かできなくなり、遮断か不能になる危険性があった。1. Problem to be Solved by the Invention: However, in order to facilitate the work of inserting the blocking bag into the fluid conduit, if the blocking bag is formed to have a relatively thin wall so that it can be compressed sufficiently, the inner surface of the fluid conduit The presence of protrusions on the fluid conduit may cause pinholes or other damage to the isolation bag, making it impossible to press the isolation bag firmly enough against the fluid conduit, posing the risk of making the isolation impossible.
本発明の目的は、遮断用バッグ゛を流体導管に容易に入
れることができながら、たとえ遮断用バッグにピンホー
ルなどの小さい損傷か生じても、流体導管の遮断を確実
に実現できるようにする点にある。An object of the present invention is to allow a blocking bag to be easily inserted into a fluid conduit, and to ensure that the fluid conduit is blocked even if the blocking bag has small damage such as a pinhole. At the point.
本発明の特徴手段は、遮断用バッグの内部に高吸水性高
分子化合物を入れて、注水に伴う吸水で前記高吸水性高
分子化合物を膨張させ、その膨張した高吸水性高分子化
合物の作用で前記遮断用バッグを膨張させることにあり
、その作用効果は次の通りである。The characteristic means of the present invention is to put a super-absorbent polymer compound inside a blocking bag, expand the super-absorbent polymer compound by water absorption due to water injection, and the action of the expanded super-absorbent polymer compound. The purpose of this invention is to inflate the blocking bag, and its effects are as follows.
〔作 用〕
高吸水性高分子化合物は例えば自重の５００倍もの大量
の水を吸収して極めて大きく膨張するから、予め高吸水
性高分子化合物を未吸水状態で遮断用バッグに入れてお
いても、遮断用バッグを十分に小さく収縮させることが
でき、また、遮断用バッグだけを小さく収縮させて先に
流体導管内に入れ、後から粉粒状で未吸水状態の高吸水
性高分子化合物を給水ホースから遮断用バッグに入れる
こともでき、したがって、流体導管に形成した割合に小
さい孔から遮断用バッグを入れることができて、遮断用
バッグを入れる作業を容易に実行できる。[Function] A superabsorbent polymer compound absorbs a large amount of water, for example 500 times its own weight, and expands to a large extent, so it is necessary to place the superabsorbent polymer compound in an unabsorbed state in a barrier bag in advance. Also, the blocking bag can be shrunk to a sufficiently small size, and only the blocking bag can be shrunk to a small size and put into the fluid conduit first, and then the powdery, unabsorbed superabsorbent polymer compound can be added. The water supply hose can also be used to enter the isolation bag, and therefore the isolation bag can be introduced through a relatively small hole formed in the fluid conduit, making the operation of inserting the isolation bag easier.
そして、流体導管内の遮断用バッグに注水して、高吸水
性高分子化合物を吸水膨張させると、膨張した高吸水性
高分子化合物の押圧作用で遮断用バッグを十分に大きく
膨張させて流体導管の内面に十分に強く押付けることが
でき、流体導管の遮断を確実に実現できる。Then, when water is poured into the blocking bag in the fluid conduit to cause the superabsorbent polymer compound to absorb water and expand, the blocking bag is expanded sufficiently by the pressure action of the expanded superabsorbent polymer compound, and the fluid conduit is opened. can be pressed strongly enough against the inner surface of the tube to reliably block the fluid conduit.
また、流体導管内面の突起により遮断用バッグにピンホ
ールなどの小さい破損が生じても、高吸水性高分子化合
物に吸収された水は遮断用バッグから流出することが無
く、膨張した高吸水性高分子化合物の押圧作用で遮断用
バッグを十分に強く流体導管に押付けることができ、流
体導管を確実に遮断できる。In addition, even if small damage such as a pinhole occurs in the blocking bag due to the protrusions on the inner surface of the fluid conduit, the water absorbed by the super absorbent polymer compound will not flow out of the blocking bag, and the expanded super absorbent The blocking bag can be pressed against the fluid conduit strongly enough by the pressing action of the polymer compound, and the fluid conduit can be reliably blocked.
その結果、遮断用バッグを十分に小さく収縮させて流体
導管に容易に入れることができるようにしながら、万一
遮断用バッグにピンホールなどの小さい損傷が生じても
、流体導管の遮断を確実に実現できる、−段と便利な流
体導管の遮断方法を確立できた。As a result, the isolation bag can be deflated small enough to be easily inserted into the fluid conduit, while still providing reliable isolation of the fluid conduit in the unlikely event that the isolation bag suffers minor damage, such as a pinhole. We have established a method for shutting off fluid conduits that is extremely convenient and practical.
請求項２記載のように、高吸水性高分子化合物を粉粒状
にしておいて、吸水膨張した高吸水性高分子化合物を遮
断用バッグから吸引排出して、遮断用バッグを収縮させ
、収縮した遮断用バッグ゛を引戻して回収すると、例え
ば流体導管を切断して高吸水性高分子化合物を内蔵する
遮断用バッグを取出すよりも、工事を容易迅速かつ経費
少なく実行できる。As described in claim 2, the super absorbent polymer compound is made into powder, and the super absorbent polymer compound expanded by water absorption is suctioned and discharged from the blocking bag, and the blocking bag is contracted. Retrieving the blocking bag by pulling it back makes the work easier, faster, and less expensive than, for example, cutting the fluid conduit and removing the blocking bag containing the superabsorbent polymer compound.
請求項３記載のように、粉粒状の高吸水性高分子化合物
を遮断用バッグ内に収納した流体導管用遮断具を提供す
ることによって、便利な本発明の流体導管遮断方法を手
軽に実行できる。As described in claim 3, by providing a fluid conduit shutoff device in which a powdery super absorbent polymer compound is housed in a shutoff bag, the convenient fluid conduit shutoff method of the present invention can be carried out easily. .
次に実施例を示す。 Next, examples will be shown.
埋設した導管の近傍で土木工事を実施する前に、下記（
イ）ないしく二）項の手順で遮断用バッグを流体導管に
対してセットする。Before carrying out civil engineering work near buried conduits, the following (
Set the blocking bag against the fluid conduit according to the steps in a) or 2).
（イ）第１図（イ）に示すように、流体導管（Ｐ）を土
木工事範囲の上流側において掘出し、シャッター（ｌａ
）付の作業装置用取付台（１）を流体導管（Ｐ）に取付
け、取付台（１）に穿孔機（２）を取付け、シャッター
（ｌａ）を開いて穿孔機（２）のトリル（２ａ）により
流体導管ＣＰ）に孔を形成する。(a) As shown in Figure 1 (a), a fluid conduit (P) is excavated on the upstream side of the civil engineering work area, and a shutter (la
) attached to the fluid conduit (P), attach the perforator (2) to the mount (1), open the shutter (la) and open the trill (2a) of the perforator (2). ) to form a hole in the fluid conduit CP).
（ロ）穿孔機（２）のドリル（２ａ）を引出した後、シ
ャッター（１ａ）を閉じ、穿孔機（２）を取付台（１）
から外す。(b) After pulling out the drill (2a) of the drilling machine (2), close the shutter (1a) and attach the drilling machine (2) to the mounting base (1).
Remove from.
（ハ）第１図（ロ）に示すように、バッグ挿入具（３）
を取付台（１）に取付け、遮断用バッグ（４）を収縮状
態でバッグ挿入具（３）の内部に収容し、遮断用バッグ
（４）に接続したホース（６）をバッグ゛挿入具（３）
に対して気密状に貫通させ、迅速継手（７）をホース（
６）の端部に付設しておく。(c) As shown in Figure 1 (b), the bag inserter (3)
is attached to the mounting base (1), the cut-off bag (4) is housed inside the bag inserter (3) in a contracted state, and the hose (6) connected to the cut-off bag (4) is inserted into the bag inserter (3). 3)
The quick fitting (7) is passed through the hose (
Attach it to the end of 6).
第１図（ハ）に示すように、遮断用バッグ（４）内に粉
粒状の高吸水性高分子化合物（５）を、その吸水膨張に
より遮断用バッグ（４）が流体導管（Ｐ）の内部遮断に
必要な大きさに膨張する量にして予め収容しておく。As shown in FIG. 1 (c), a powder-like super absorbent polymer compound (5) is placed in a blocking bag (4), and the blocking bag (4) opens the fluid conduit (P) by expanding by water absorption. It is stored in advance in an amount that will expand to the size required for internal isolation.
高吸水性高分子化合物（５）は、例えばポリビニルアル
コールを主成分としだ共重合体等であり、自重の５００
倍程度の水を吸収するものか望ましく、２〜３μｍの微
粉状であることか望ましい。The super absorbent polymer compound (5) is, for example, a copolymer containing polyvinyl alcohol as a main component, and has a weight of 500% of its own weight.
It is desirable that it absorbs about twice as much water, and it is desirable that it be in the form of a fine powder of 2 to 3 μm.
（ニ）第１図（ハ）に示すように、掘削箇所を埋戻すと
共に、蓋（８ａ）付のケース（８）を埋設し、道路を復
旧工事し、迅速継手（７）をケース（８）内に収容し、
必要時に蓋（８ａ）を開いて、注水装置を直ちに迅速継
手（７）に接続できるようにしておく。(d) As shown in Figure 1 (c), the excavated area is backfilled, a case (8) with a lid (8a) is buried, the road is restored, and the quick joint (7) is installed in the case (8). ),
When necessary, open the lid (8a) so that the water injection device can be immediately connected to the quick coupling (7).
以上の準備をした後、流体導管（Ｐ）の近傍で土木工事
を実行し、そして、土木工事に伴って流体導管（Ｐ）が
破損すると、下記の処置で漏洩を阻止する。After making the above preparations, civil engineering work is performed near the fluid conduit (P), and if the fluid conduit (P) is damaged due to the civil engineering work, the following measures are taken to prevent leakage.
第１図（ニ）に示すように、蓋（８ａ）を開いて注水装
置（９）を迅速継手（７）に接続し、−注水装置（９）
で遮断用バッグ（４）内に注水して、遮断用バッグ（４
）を自重落下で流体導管（Ｐ）の内部に入れ、高吸水性
高分子化合物（５）を吸水膨張させ、膨張した高吸水性
高分子化合物（５）の作用で遮断用バッグ（４）を膨張
させ、膨張した遮断用バッグ′（４）により流体導管（
Ｐ）の破損部（１０）からの漏洩を阻止する。As shown in Figure 1 (d), open the lid (8a) and connect the water injection device (9) to the quick fitting (7), - the water injection device (9)
Pour water into the isolation bag (4) using the
) into the fluid conduit (P) by falling under its own weight, the super absorbent polymer compound (5) absorbs water and expands, and the blocking bag (4) is opened by the action of the expanded super absorbent polymer compound (5). The fluid conduit (
P) from leaking from the damaged part (10).
その後、破損部（１０）を公知補修手段により補修し、
第１図（ホ）に示すように、吸引装置（１３）に接続し
たチューブ（１４）をホース（６）から遮断用バッグ（
４）の内部に挿入し、膨張した高吸水性高分子化合物（
５）を吸引装置（１３）により吸引排出して、遮断用バ
ッグ（４）を収縮させ、流体輸送を再開する。After that, the damaged part (10) is repaired by known repair means,
As shown in Figure 1 (E), the tube (14) connected to the suction device (13) is connected to the hose (6) through the blocking bag (
4) Insert the expanded superabsorbent polymer compound (
5) is suctioned and discharged by the suction device (13), the blocking bag (4) is deflated, and fluid transport is resumed.
そして、土木工事か完了すれば、取付台（１）を掘出し
、遮断用バッグ（４）をバッグ′挿入具（３）の内部に
引戻し、シャッター（１ａ）を閉じて、バッグ挿入具（
３）を取付台（１）から外す。When the civil engineering work is completed, the mounting base (1) is dug out, the blocking bag (4) is pulled back into the bag' insertion tool (3), the shutter (1a) is closed, and the bag insertion tool (3) is closed.
3) Remove from the mounting base (1).
次に、第１図（へ）に示すように、プラグ装着機（１１
）を取付台（１）に取付け、シャッター（１ａ）を開い
て、流体導管（Ｐ）の孔をプラグ（２）で閉じる。Next, as shown in FIG.
) on the mounting base (1), open the shutter (1a) and close the hole of the fluid conduit (P) with the plug (2).
その後、取付台（１）、プラグ装着機（１１）を回収し
て、流体導管（Ｐ）を埋戻す。Thereafter, the mounting base (1) and the plug attachment machine (11) are recovered, and the fluid conduit (P) is backfilled.
＝別実施例： 次に別実施例を説明する。=Another example: Next, another embodiment will be described.
第２図に示すように、収縮した遮断用バッグ（４）を流
体導管（Ｐ）の内部に入れて磁石（１５）で固定しおい
てもよく、また、流体導管（Ｐ）に接続した管の内部に
入れた遮断用バッグ（４）を、流体導管（Ｐ）か破損し
た時に流体導管（Ｐ）の内部に入れた後に膨張させても
よい。As shown in FIG. 2, the deflated blocking bag (4) may be placed inside the fluid conduit (P) and fixed with a magnet (15), or a tube connected to the fluid conduit (P) may be used. A blocking bag (4) placed inside the fluid conduit (P) may be inflated after being placed inside the fluid conduit (P) when the fluid conduit (P) breaks.
流体導管（Ｐ）の内部、又は、流体導管（Ｐ）に接続し
た管の内部に遮断用バッグ（４）を入れるための手段は
、公知の不断流式や断流式の工法から適当に選定できる
。The means for placing the blocking bag (4) inside the fluid conduit (P) or inside the pipe connected to the fluid conduit (P) is appropriately selected from the known non-flow type and flow cut-off type construction methods. can.
遮断用バッグ（４）は１箇所に２個設けてもよく、また
、工事範囲の下流側にも併せ設置してもよい。Two blocking bags (4) may be provided at one location, or may also be provided on the downstream side of the construction area.
流体導管（Ｐ）は都市ガス用、水道用、その他いかなる
ものでもよく、又、地上に設置したものでもよい。The fluid conduit (P) may be for city gas, water, or any other type, and may be installed above ground.
流体導管（Ｐ）の近傍で実施する工事の種類はいかなる
ものでもよい。Any type of construction work may be performed in the vicinity of the fluid conduit (P).
工事実施以前に注水装置（９）を遮断用バッグ（４）に
接続しておいてもよく、また、注水装置（９）は給水タ
ンク、ポンプなど適当に選定できる。注入する水は水溶
液でも懸濁水でも水スラリーでもよい。The water injection device (9) may be connected to the blocking bag (4) before the construction starts, and the water injection device (9) can be appropriately selected from a water tank, a pump, etc. The water to be injected may be an aqueous solution, a suspension, or a water slurry.
流体導管（Ｐ）に遮断用バッグ（４）を入れるに必要な
作業を、流体導管（Ｐ）において漏洩など４
の緊急遮断か必要な事態が発生した後に開始してもよい
。The operations necessary to place the shutoff bag (4) in the fluid conduit (P) may be started after an event occurs in the fluid conduit (P) that requires emergency shutoff, such as a leak.
遮断用バッグ（４）を流体導管（Ｐ）又はそれに接続し
た管に入れた後で、粉粒状の高吸水性高分子化合物（５
）をホース（６）から遮断用バッグ（４）内に入れても
よい。After putting the blocking bag (4) into the fluid conduit (P) or the pipe connected to it, a powdery super absorbent polymer compound (5
) may be introduced from the hose (6) into the isolation bag (4).
高吸水性高分子化合物（５）の大きさは適当に選定でき
、膨張した高吸水性高分子化合物（５）をホース（６）
から排出できない場合は、流体導管（Ｐ）を切断して、
遮断用バッグ（４）を回収してもよい。The size of the super absorbent polymer compound (5) can be selected appropriately, and the expanded super absorbent polymer compound (5) is attached to the hose (6).
If the fluid cannot be drained, cut the fluid conduit (P) and
The blocking bag (4) may be collected.
尚、特許請求の範囲の項に図面との対照を便利にする為
に符号を記すが、該記入により本発明は添付図面の構造
に限定されるものではない。Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.
第１図（イ）ないしくへ）は本発明の実施例の施工手順
説明図である。第２図は本発明の別実施例を示す概念図
である。
（４）・・・・・・遮断用バッグ′、（５）・・・・・
・高吸水性高分子化合物、（６）・・・・・・注水ホー
ス、（Ｐ）・・・・・・流体導管。
第
図FIG. 1(a) to 1(a) to 1(a) are explanatory views of the construction procedure of an embodiment of the present invention. FIG. 2 is a conceptual diagram showing another embodiment of the present invention. (4)...Bag for blocking', (5)...
・Super absorbent polymer compound, (6)...Water injection hose, (P)...Fluid conduit. Diagram
Claims (1)
状態で入れ、その遮断用バッグ（４）を内部注水により
膨張させ、その膨張した遮断用バッグ（４）により前記
流体導管の内部を遮断する方法であって、 前記遮断用バッグ（４）の内部に高吸水性高分子化合物
（５）を入れて、注水に伴う吸水で前記高吸水性高分子
化合物（５）を膨張させ、その膨張した高吸水性高分子
化合物（５）の作用で前記遮断用バッグ（４）を膨張さ
せる流体導管の遮断方法。 ２、前記高吸水性高分子化合物（５）を粉粒状にしてお
いて、前記遮断用バッグ（４）の回収に際し、その遮断
用バッグ（４）内の膨張した前記高吸水性高分子化合物
（５）を吸引排出して、前記遮断用バッグ（４）を収縮
させ、その収縮した遮断用バッグ（４）を引戻す請求項
１記載の流体導管の遮断方法。 ３、膨張収縮自在に形成されると共に注水ホース（６）
を接続した遮断用バッグ（４）の内部に、粉粒状の高吸
水性高分子化合物（５）をその吸水膨張により前記遮断
用バッグ（４）が流体導管（Ｐ）の内部遮断に必要な大
きさに膨張する量にして収容してある流体導管用遮断具
。[Scope of Claims] 1. Place the cutoff bag (4) in a deflated state inside the fluid conduit (P), inflate the cutoff bag (4) by injecting water inside, and remove the inflated cutoff bag (4). ) is a method of blocking the inside of the fluid conduit by placing a superabsorbent polymer compound (5) inside the blocking bag (4), and absorbing water due to water injection into the superabsorbent polymer compound. (5) A method for blocking a fluid conduit in which the blocking bag (4) is expanded by the action of the expanded superabsorbent polymer compound (5). 2. The superabsorbent polymer compound (5) is made into powder, and when the blocking bag (4) is collected, the superabsorbent polymer compound (5) expanded in the blocking bag (4) is 5) The method for shutting off a fluid conduit according to claim 1, wherein the shutoff bag (4) is contracted by suctioning and discharging the shutoff bag (4), and the contracted shutoff bag (4) is pulled back. 3. Water injection hose (6) formed to be able to expand and contract freely
A powder-like super-absorbent polymer compound (5) is added to the inside of the blocking bag (4) connected to the fluid conduit (P) so that the blocking bag (4) has a size necessary for internally blocking the fluid conduit (P). A shutoff device for fluid conduits that is housed in an amount that expands quickly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007755A JPH03213796A (en) | 1990-01-16 | 1990-01-16 | Method and tool for shutting off fluid conduit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007755A JPH03213796A (en) | 1990-01-16 | 1990-01-16 | Method and tool for shutting off fluid conduit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03213796A true JPH03213796A (en) | 1991-09-19 |
Family
ID=11674512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007755A Pending JPH03213796A (en) | 1990-01-16 | 1990-01-16 | Method and tool for shutting off fluid conduit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03213796A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016204866A (en) * | 2015-04-17 | 2016-12-08 | 東京電力ホールディングス株式会社 | Water stop method by freezing |
-
1990
- 1990-01-16 JP JP2007755A patent/JPH03213796A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016204866A (en) * | 2015-04-17 | 2016-12-08 | 東京電力ホールディングス株式会社 | Water stop method by freezing |
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