JP4293649B2 - High water pressure pumping block method - Google Patents

High water pressure pumping block method Download PDF

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Publication number
JP4293649B2
JP4293649B2 JP20041198A JP20041198A JP4293649B2 JP 4293649 B2 JP4293649 B2 JP 4293649B2 JP 20041198 A JP20041198 A JP 20041198A JP 20041198 A JP20041198 A JP 20041198A JP 4293649 B2 JP4293649 B2 JP 4293649B2
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Japan
Prior art keywords
pumping
pipe
mortar
injection
water pressure
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Expired - Fee Related
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JP20041198A
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Japanese (ja)
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JP2000028034A (en
Inventor
清広 山下
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Taisei Corp
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Taisei Corp
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Description

【0001】
【発明の属する技術分野】
本発明は使用後の不要となった揚水管の閉塞方法に関する。
【0002】
【従来の技術】
地下の掘削工事効率化を計るために行う地下水位低下のための揚水管を、地下の掘削工事終了後、閉塞撤去する場合、揚水管にバルブを取り付け揚水管内にモルタル注入を行い、揚水管を閉塞していた。
【0003】
しかしこの方法では、閉塞のためのモルタルが分離してしまうため、
▲1▼ 効果的な閉塞が行えない。
▲2▼ 高水圧の地下水による噴出事故等が発生する。
▲3▼ 閉塞のために費やした多大な費用が無駄となる。
等の点で問題があった。
【0004】
【発明が解決しようとする課題】
本発明は、上記従来の問題点を解決するためになされたもので、簡単な方法により、効率的にかつ確実に高水圧の揚水管を閉塞することができる方法を提供することを目的とする。
【0005】
【課題を解決するための手段】
上記のような目的を達成する本発明の高水圧の揚水管閉塞方法は、地下の掘削工事効率化を計るために行う地下水位低下のための揚水管を、地下の掘削工事終了後、閉塞撤去する方法であって、揚水スルース弁を介して排水パイプ、排水スルース弁、圧力計、別の排水パイプに取り付けた弁等から構成した揚水設備を取り付けた地下水位低下のための揚水管を設置する時に、前記揚水管の近傍にモルタル注入管、エア抜き管設置しておき、地下の掘削工事の終了後に、揚水施設を撤去するに際し、揚水スルース弁を閉塞し、前記揚水スルース弁閉塞時の揚水管の水圧を確認後、揚水管と前記揚水スルース弁以外の揚水設備を撤去し、モルタル注入用の弁を前記モルタル注入管に取り付け、前記揚水スルース弁閉塞時の揚水管の水圧以上に設定した注入圧で地中にモルタル注入すると共に、前記エア抜き管よりエア抜きを行い、前記エア抜き管より注入したモルタルが噴出した時点でモルタル注入を中止することを特徴としたものである。
【0006】
【発明の実施の形態】
以下図面を参照しながら、本発明の実施形態について説明する。
【0007】
<イ>全体構成
図1は本発明による高水圧の揚水管閉塞方法を示す側断面図である。
地下の掘削工事効率化を計るために行う地下水位低下のための揚水管1を、地下の掘削工事終了後、閉塞撤去する方法であって、地下水位低下のための揚水管1を設置時に、揚水管1の近傍にモルタル注入管2、エア抜き管3を設置しておき、揚水スルース弁4を閉塞し、閉塞時の揚水管1の水圧を確認後、揚水管1と揚水スルース弁4以外の揚水設備を撤去し、前記水圧以上に設定した注入圧でモルタル注入すると共に、エア抜きを行い、エア抜き管3よりモルタルが噴出した時点でモルタル注入を中止する、高水圧の揚水管閉塞方法である。
【0008】
<ロ>揚水設備
図1における揚水設備Aは、従来から使用されている揚水のための設備機器類の配置図である。
地下水を揚水のため地中深くに設置された揚水管1の頂部に、揚水スルース弁4を取り付け、この揚水スルース弁4を介して揚水設備Aが設置される。
揚水設備Aは、たとえば排水パイプ5、排水スルース弁6、圧力計7、別の排水パイプ5に取り付けた弁8等から構成されている。
本実施例においては、前記揚水設備Aが底床版9の上面に位置するように予め設置されている。
また、工事終了後、前記揚水スルース弁4が底床版9の厚さ内に収納されるように予め設置されており、工事中は揚水スルース弁4が設置されている部分の底床版9は箱抜きされている。
本実施例においては、揚水設備Aは地下階に設置されているため、その上部の地上部にマンホール10を設置すると共に、揚水設備Aを作動させる操作盤11が設置されている。
【0009】
<ハ>閉塞設備
地下階に揚水設備Aを設置時に、揚水管1の近傍にモルタル注入管2、エア抜き管3が設置される。
モルタル注入管2、エア抜き管3は従来から使用されているものでよく、それぞれの上端は盲フランジ12により蓋がされている。
【0010】
【作用】
以下に、本発明による高水圧の揚水管閉塞方法を説明する。
【0011】
<イ>揚水設備の撤去
操作盤11により揚水設備Aのポンプ運転スイッチを切って揚水スルース弁4を閉塞し、揚水管1の運転を停止する。
揚水スルース弁4を閉塞した時には、揚水管1の水圧を確認しておく。
ポンプの運転停止後、ポンプの電気配線設備の撤去を行い、引き続き揚水スルース弁4上部の揚水設備Aを解体撤去する。
【0012】
<ロ>揚水管の閉塞
底床版9上にモルタル注入用プラント設備等を組み立てる。
モルタル注入管2、エア抜き管3上端の盲フランジ12を撤去し、モルタル注入管2にモルタル注入用の弁を取り付け、エア抜き管3にはエア抜き用弁を取り付ける。
モルタル注入に際しては、予め揚水管1の水圧が確認してあるので、その水圧以上に設定した注入圧でモルタル注入するものである。
たとえば水圧が1.5気圧であった場合、注入圧は2.0〜3.0気圧に設定する。
モルタル注入量は、事前に設計注入量を算定しておき実施する。
モルタル注入作業時は、注入圧の変化に注意してエア抜き管3からのエア、地下水の流出量を目視により確認しながら、エア抜き管3からモルタルが流出しはじめた時、モルタル注入作業を終了する。
注入作業が終了後、すべての弁を閉塞して注入したモルタルの養生を行う。
【0013】
<ハ>注入材料
閉塞に用いるモルタルについては、揚水管1内が被圧水位が高く、静水位状態ではないため、水中でモルタルが分離する可能性がある。
本実施例において使用するモルタルは、水中モルタルとして水中不分離性コンクリート用混和剤を混入したモルタルを使用する。
このモルタルを使用することにより、ワーカビリティーがよく、ブリージング量も少ないため、材料分離等によるセメントが流出する可能性もなく、水質汚濁の心配がない。
また、強度的にもコンクリート本来の強度を維持し、材料本体がアルカリ性であるため、金属鋼材等への腐食の心配もない。
【0014】
<ニ>漏水の確認とその処置
モルタル注入作業が終了後、注入した揚水管1内から漏水、出水等がないか確認する。漏水等がない場合には、揚水スルース弁4、注入弁等を撤去して盲フランジ12を取り付ける。
漏水等がある場合には、漏水箇所にドリル等を使用して孔をあけ、注入用プラグを取り付け、たとえば発泡ウレタン系材料を注入し、止水注入を終了する。
【0015】
<ホ>底床版切欠き部の閉塞
揚水管1内の閉塞完了後底床版9切欠き部、及びその下部(点線部のコンクリート打設部13)の閉塞を行う。
切欠き部13に鉄筋組立てを行い、無収縮モルタル等を打設し閉塞する。
【0016】
【発明の効果】
本発明は以上説明したようになるから、次のような効果を得ることができる。
<イ>注入時の水圧管理を行ってから注入するので、モルタルの分離を抑制できる。
<ロ>モルタルは、水中不分離性コンクリート用混和剤を混入したモルタルを使用するので、モルタルの分離を抑制でき、高密度に充填できる。
<ハ>揚水管内の閉塞完了後、地下水が噴出することがないので、工費の節減ができる。
【図面の簡単な説明】
【図1】本発明による高水圧の揚水管閉塞方法を示す側断面図。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for closing a pumping pipe that has become unnecessary after use.
[0002]
[Prior art]
When the pumping pipe for lowering the groundwater level to improve the efficiency of underground excavation work is removed after the underground excavation work is completed, a valve is attached to the pumping pipe and mortar is injected into the pumping pipe. It was obstructed.
[0003]
However, with this method, the mortar for occlusion separates,
(1) Effective blockage cannot be performed.
(2) A jetting accident caused by high-pressure groundwater occurs.
(3) A great amount of money spent for blocking is wasted.
There was a problem in terms of etc.
[0004]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a method capable of efficiently and reliably closing a high water pressure pumping pipe by a simple method. .
[0005]
[Means for Solving the Problems]
The high water pressure pumping pipe closing method of the present invention that achieves the above object is to remove the blockage of the pumping pipe for lowering the groundwater level to improve the efficiency of underground drilling work after the underground drilling work is completed. A method of installing a pumping pipe for lowering the groundwater level with a pumping equipment composed of a drainage pipe, a drainage sluice valve, a pressure gauge, a valve attached to another drainage pipe, etc. through a pumping sluice valve Sometimes, a mortar injection pipe and an air vent pipe are also installed in the vicinity of the pumping pipe, and when the pumping facility is removed after the underground excavation work is completed, the pumping sluice valve is closed. after confirming water pressure riser pipe, and removing the pumping equipment other than the pumping sluice valve and riser pipe, fitted with a valve for mortar injected into the mortar injection tube, set above the pressure of riser pipe during the pumping sluice valve closed While mortar injected into the ground at the injection pressure, perform air bleeding from the air vent pipe, mortar injected from the air vent tube is obtained by means ceases the mortar injection at the time of the ejection.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0007]
<A> Overall Configuration FIG. 1 is a side sectional view showing a high water pressure pumping pipe closing method according to the present invention.
A method of removing the blockage of the pumping pipe 1 for lowering the underground water level to improve the efficiency of the underground drilling work after the underground drilling work is completed, and at the time of installing the pumping pipe 1 for lowering the underground water level, A mortar injection pipe 2 and an air vent pipe 3 are installed in the vicinity of the pumping pipe 1, the pumping sluice valve 4 is closed, and after checking the water pressure of the pumping pipe 1 at the closing time, other than the pumping pipe 1 and the pumping sluice valve 4 The high water pressure pumping pipe closing method is to remove the water pumping equipment, inject mortar at the injection pressure set above the water pressure, perform air venting, and stop mortar injection when the mortar is ejected from the air vent pipe 3 It is.
[0008]
<B> Pumping facility Pumping facility A in FIG. 1 is a layout diagram of facility equipment for pumping that has been conventionally used.
A pumping sluice valve 4 is attached to the top of a pumping pipe 1 installed deep in the ground for pumping groundwater, and a pumping equipment A is installed through the pumping sluice valve 4.
The pumping equipment A includes, for example, a drain pipe 5, a drain sluice valve 6, a pressure gauge 7, a valve 8 attached to another drain pipe 5, and the like.
In this embodiment, the pumping equipment A is installed in advance so as to be located on the upper surface of the bottom floor slab 9.
Further, after completion of the construction, the pumped sluice valve 4 is installed in advance so as to be accommodated within the thickness of the bottom floor slab 9, and during the construction, the portion of the bottom floor slab 9 where the pumped sluice valve 4 is installed. Is unboxed.
In the present embodiment, since the pumping equipment A is installed on the basement floor, the manhole 10 is installed on the above-ground part, and the operation panel 11 for operating the pumping equipment A is installed.
[0009]
<C> A mortar injection pipe 2 and an air vent pipe 3 are installed in the vicinity of the pumping pipe 1 when the pumping equipment A is installed on the basement floor of the closed equipment.
The mortar injection pipe 2 and the air vent pipe 3 may be those conventionally used, and each upper end is covered with a blind flange 12.
[0010]
[Action]
Hereinafter, a method for closing a high-pressure pumping pipe according to the present invention will be described.
[0011]
<I> The pump operation switch of the pumping equipment A is turned off by the removal operation panel 11 of the pumping equipment to close the pumping sluice valve 4 and the operation of the pumping pipe 1 is stopped.
When the pumped sluice valve 4 is closed, the water pressure in the pumped pipe 1 is confirmed.
After stopping the operation of the pump, the electric wiring equipment of the pump is removed, and the pumping equipment A above the pumping sluice valve 4 is dismantled and removed.
[0012]
<B> Assemble the plant equipment for mortar injection on the closed bottom slab 9 of the pumping pipe.
The blind flange 12 at the upper end of the mortar injection pipe 2 and the air vent pipe 3 is removed, a mortar injection valve is attached to the mortar injection pipe 2, and an air vent valve is attached to the air vent pipe 3.
In injecting the mortar, since the water pressure of the pumping pipe 1 is confirmed in advance, the mortar is injected at an injection pressure set higher than the water pressure.
For example, when the water pressure is 1.5 atm, the injection pressure is set to 2.0 to 3.0 atm.
The mortar injection amount is calculated after calculating the design injection amount in advance.
At the time of mortar injection work, pay attention to the change in the injection pressure and visually check the outflow amount of air and groundwater from the air bleed pipe 3, and when the mortar starts to flow out from the air bleed pipe 3, finish.
After the injection operation is completed, all the valves are closed and the injected mortar is cured.
[0013]
<C> About the mortar used for injection | pouring injection | pouring material, since the pressurized water level is high in the pumping pipe 1, and it is not a still water level state, mortar may isolate | separate in water.
The mortar used in the present embodiment is a mortar mixed with an underwater non-separable concrete admixture as an underwater mortar.
By using this mortar, workability is good and the amount of breathing is small, so there is no possibility of cement flowing out due to material separation or the like, and there is no concern about water pollution.
In addition, the strength of the concrete is maintained in terms of strength, and the material body is alkaline, so there is no risk of corrosion on the metal steel.
[0014]
<D> Confirmation of water leakage and its treatment After completion of the mortar injection work, it is confirmed whether there is any water leakage, water discharge, etc. from the injected pumping pipe 1. When there is no water leakage, the pumped sluice valve 4 and the injection valve are removed and the blind flange 12 is attached.
If there is water leakage or the like, a hole is drilled in the water leakage location using a drill or the like, an injection plug is attached, for example, a urethane foam material is injected, and the water stop injection is terminated.
[0015]
<E> Blocking of bottom floor slab notch After closing in the pumped-up pipe 1, the bottom floor slab 9 notch and the lower part thereof (the concrete placing part 13 in the dotted line) are closed.
Reinforcing bars are assembled in the notch 13, and non-shrinking mortar or the like is placed and closed.
[0016]
【The invention's effect】
Since the present invention has been described above, the following effects can be obtained.
<I> Since injection is performed after water pressure management at the time of injection, separation of mortar can be suppressed.
<B> Since the mortar uses a mortar mixed with an underwater inseparable admixture for concrete, it can suppress separation of the mortar and can be filled with high density.
<C> Since the groundwater does not erupt after the blockage in the pumping pipe is completed, the construction cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a high water pressure pumping pipe closing method according to the present invention.

Claims (1)

地下の掘削工事効率化を計るために行う地下水位低下のための揚水管を、地下の掘削工事終了後、閉塞撤去する方法であって、
揚水スルース弁を介して排水パイプ、排水スルース弁、圧力計、別の排水パイプに取り付けた弁等から構成した揚水設備を取り付けた地下水位低下のための揚水管を設置する時に、
前記揚水管の近傍にモルタル注入管、エア抜き管設置しておき、
地下の掘削工事の終了後に、揚水施設を撤去するに際し、
揚水スルース弁を閉塞し、前記揚水スルース弁閉塞時の揚水管の水圧を確認後、
揚水管と前記揚水スルース弁以外の揚水設備を撤去し、
モルタル注入用の弁を前記モルタル注入管に取り付け、
前記揚水スルース弁閉塞時の揚水管の水圧以上に設定した注入圧で地中にモルタル注入すると共に、前記エア抜き管よりエア抜きを行い、
前記エア抜き管より注入したモルタルが噴出した時点でモルタル注入を中止することを特徴とする、
高水圧の揚水管閉塞方法。
It is a method of removing the blockage of the pumping pipe for lowering the groundwater level to improve the efficiency of underground excavation work after the completion of the underground excavation work,
When installing a pumping pipe for lowering the groundwater level with a pumping equipment composed of a drainage pipe, a drainage sluice valve, a pressure gauge, a valve attached to another drainage pipe, etc.
A mortar injection pipe and an air vent pipe are also installed in the vicinity of the pumping pipe,
After removing the pumping facilities after the underground excavation work,
After closing the pumping sluice valve and confirming the water pressure in the pumping pipe when the pumping sluice valve is closed,
Remove the pumping equipment other than the pumping pipe and the pumping sluice valve,
A mortar injection valve is attached to the mortar injection pipe,
Injecting mortar into the ground with an injection pressure set higher than the water pressure of the pumping pipe when the pumping sluice valve is closed, and venting air from the air vent pipe,
The mortar injection is stopped when the mortar injected from the air vent pipe is ejected,
High water pressure pumping block method.
JP20041198A 1998-07-15 1998-07-15 High water pressure pumping block method Expired - Fee Related JP4293649B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP20041198A JP4293649B2 (en) 1998-07-15 1998-07-15 High water pressure pumping block method

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JP4293649B2 true JP4293649B2 (en) 2009-07-08

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Publication number Priority date Publication date Assignee Title
JP5072483B2 (en) * 2007-08-17 2012-11-14 東京都下水道サービス株式会社 Blocking method for unblocked mounting pipes
JP5309247B2 (en) * 2012-04-27 2013-10-09 東京都下水道サービス株式会社 Blocking method for unblocked mounting pipes
JP6763678B2 (en) * 2015-03-27 2020-09-30 ユーロフィン日本環境株式会社 Soil sampling method and groundwater outlet pipe
CN109706934B (en) * 2019-01-18 2023-10-20 山东建勘集团有限公司 Curtain grouting water plugging device in pressure-bearing water stratum and working method thereof
CN113216123B (en) * 2021-04-30 2024-03-22 中国葛洲坝集团第一工程有限公司 Gate chamber side wall karst water gushing treatment method
CN114197508B (en) * 2021-11-26 2023-11-03 上海长凯岩土工程有限公司 Easy-to-seal water draining device, manufacturing method and using method thereof

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