JPH054430B2 - - Google Patents
Info
- Publication number
- JPH054430B2 JPH054430B2 JP61113446A JP11344686A JPH054430B2 JP H054430 B2 JPH054430 B2 JP H054430B2 JP 61113446 A JP61113446 A JP 61113446A JP 11344686 A JP11344686 A JP 11344686A JP H054430 B2 JPH054430 B2 JP H054430B2
- Authority
- JP
- Japan
- Prior art keywords
- mud
- water
- gelled
- muddy water
- excavated soil
- 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.)
- Expired - Lifetime
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 239000002689 soil Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 235000006506 Brasenia schreberi Nutrition 0.000 claims description 9
- 244000267222 Brasenia schreberi Species 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000003349 gelling agent Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 6
- 230000005641 tunneling Effects 0.000 claims description 4
- 239000012213 gelatinous substance Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 description 15
- 239000000126 substance Substances 0.000 description 14
- 238000000926 separation method Methods 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 239000010802 sludge Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000011345 viscous material Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 239000002535 acidifier Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000003113 alkalizing effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid 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
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- YBBRCQOCSYXUOC-UHFFFAOYSA-N sulfuryl dichloride Chemical compound ClS(Cl)(=O)=O YBBRCQOCSYXUOC-UHFFFAOYSA-N 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 この発明は、泥水シールド工法に関する。[Detailed description of the invention] <Industrial application field> The present invention relates to a muddy water shield construction method.
〈発明の背景とその問題点〉
硬岩以外の地山を対象としたトンネル構築法の
１つとして泥水シールド工法があるが、この工法
は密閉形シールド掘進機を用い、この掘進機前面
の密閉された加圧室内に泥水を圧出し、この泥水
の圧力を切羽に対抗させることにより切羽の安定
化を図るとともに、泥水と加圧室に取り入れられ
た掘削土との混合により流動化させた状態でこれ
らの混合物を前記掘進機の後方に排出する工法で
ある。<Background of the invention and its problems> The muddy water shield method is one of the methods for constructing tunnels in geological formations other than hard rock. The muddy water is forced out into the pressurized chamber, and the pressure of this muddy water is applied against the face to stabilize the face, and the muddy water is mixed with the excavated soil taken into the pressurized chamber to create a fluidized state. This is a construction method in which the mixture is discharged to the rear of the excavator.
この工法に用いられる泥水は、主にベントナイ
トなどの粘土を水に懸濁させ、分散剤，増粘剤な
どを添加した組成のものが用いられる。 The muddy water used in this construction method mainly consists of clay such as bentonite suspended in water, with the addition of dispersants, thickeners, etc.
しかしながら、この種の工法においても、地下
水位が高く地盤の透水係数が大である場合には、
加圧泥水の逸泥により切羽の安定や止水性を確保
することが難しくなり、シールド掘進が不可能と
なる。 However, even with this type of construction method, if the groundwater level is high and the ground has a large permeability coefficient,
Due to the leakage of pressurized mud water, it becomes difficult to ensure the stability and water-tightness of the face, making shield excavation impossible.
この対策としては供給泥水の粘度を高くすれば
よい、この場合には泥水および回収泥水の流体輸
送に支障が生じ、また回収泥水と掘削土との混合
物の分離が難しいものとなる。 A countermeasure against this problem is to increase the viscosity of the supplied mud. In this case, fluid transportation of the mud and the recovered mud is hindered, and separation of the mixture of the recovered mud and the excavated soil becomes difficult.
ところで、本出願人は先に水に溶解した粘性物
質からなるゲル状物質と、硼砂，ホウ酸などの添
加剤とからなるゲル化泥水を開発した。 By the way, the present applicant has previously developed a gelled muddy water made of a gel-like substance made of a viscous substance dissolved in water and additives such as borax and boric acid.
このゲル化泥水は水素イオン濃度（PH）の調整
によつて、粘度がアルカリ側で数万センチポイズ
から酸性側で10〜50センチポイズと極めて広い範
囲で変化する。 By adjusting the hydrogen ion concentration (PH), the viscosity of this gelled mud varies over a wide range, from tens of thousands of centipoises on the alkaline side to 10 to 50 centipoises on the acidic side.
従つて、例えば砂礫層などの逸泥が大きな地盤
を掘削するときには、アルカリ側、すなわちゲル
化剤の混合により高粘度ゲル化した状態で加圧室
内に供給することにより、逸泥量を最小に抑える
ことができる。またこの高粘度ゲル化したゲル化
泥水は、混合後酸性化剤、すなわち解ゲル化剤を
混合し、低粘度化させることにより、掘削した土
砂との分離を図ることができ、しかも分離後の上
澄みを再使用できる利点がある。 Therefore, when excavating ground with a large amount of lost sludge, such as a gravel layer, the amount of lost sludge can be minimized by supplying the alkaline side, that is, the high viscosity gelled state by mixing with a gelling agent, into the pressurizing chamber. It can be suppressed. In addition, this highly viscous gelled mud water can be separated from the excavated earth and sand by mixing an acidifying agent, that is, a degelling agent, to lower the viscosity after mixing. There is an advantage that the supernatant can be reused.
この発明は、以上のゲル化泥水の有する特性を
有効利用することにより、泥水シールド工法にお
ける切羽の安定化と輸送に適した流動性の確保を
図り、また泥水そのものの消費量の削減を図るこ
とを目的とする。 This invention aims to stabilize the face in the muddy water shield method and ensure fluidity suitable for transportation by effectively utilizing the above-mentioned properties of gelled muddy water, and also aims to reduce the consumption of muddy water itself. With the goal.
〈問題点を解決するための手段〉
前記の目的を達成するため、この発明の泥水シ
ールド工法は、泥水をシールド掘進機の加圧室内
に圧送して該泥水の圧力により切羽の安定を図る
とともに、加圧室内に取り入れられた掘削土を流
動化させた状態で該掘削土および泥水の混合物を
前記掘進機の後方に排出するようにした泥水シー
ルド工法において、前記泥水としてゲル状物質を
含むゲル化泥水を用い、該ゲル化泥水を加圧室に
供給する直前にゲル化剤を添加混合するととも
に、加圧室から排出された掘削土と前記ゲル化泥
水とからなる混合物に解ゲル化剤を添加すること
を特徴とするものである。<Means for solving the problem> In order to achieve the above-mentioned object, the muddy water shield method of the present invention works by force-feeding muddy water into the pressurizing chamber of the shield excavation machine and stabilizing the face using the pressure of the muddy water. In a mud water shield construction method, in which excavated soil taken into a pressurizing chamber is fluidized and a mixture of the excavated soil and mud water is discharged to the rear of the excavator, the mud water is a gel containing a gel-like substance. Using gelled mud, a gelling agent is added and mixed immediately before the gelled mud is supplied to the pressurizing chamber, and a degelling agent is added to the mixture consisting of the excavated soil discharged from the pressurizing chamber and the gelled mud. It is characterized by the addition of.
〈実施例〉
以下、この発明の実施例を図面を用いて詳細に
説明する。<Example> Hereinafter, an example of the present invention will be described in detail using the drawings.
図はこの発明工法を適用したゲル化泥水の供
給・回収システムを示す説明図である。 The figure is an explanatory diagram showing a gelled mud water supply/recovery system to which this invention method is applied.
図において、１は密閉形シールド掘進機であ
り、この掘進機１の前部には隔壁２によつて仕切
られた加圧室３が形成されていて、その前面にカ
ツターデイスク４が設けられている。 In the figure, reference numeral 1 denotes a closed type shield tunneling machine, and the front part of this tunneling machine 1 is formed with a pressurized chamber 3 partitioned by a partition wall 2, and a cutter disk 4 is provided in front of the pressurized chamber 3. ing.
そして、前記隔壁２の上部にはゲル化泥水圧送
用の送泥管６が、また下部には回収用排泥管７が
貫通して設けられている。前記圧送用の送泥管６
にはバルブ６ａを介して泥水供給ライン８が接続
されている。この泥水供給ライン８はシールド抗
９の後部にある発進用立抗上あるいはこの立抗に
接して設けられた作泥プラント１０に接続されて
いる。 A mud feeding pipe 6 for force-feeding gelled mud is provided in the upper part of the partition wall 2, and a collecting mud draining pipe 7 is provided in the lower part thereof. The mud feeding pipe 6 for pressure feeding
A mud water supply line 8 is connected to the tank via a valve 6a. This mud water supply line 8 is connected to a mud production plant 10 provided on or in contact with a starting shaft at the rear of the shield shaft 9.
作泥プラント１０内にはそれぞれ貯溜槽１１，
回収槽１２，分離槽１４が配置されている
貯溜槽１１上には撹拌槽１５が配置されてい
る。この撹拌槽１５内で前述の粘性物質，水およ
び防腐剤を均一に混合して作成したゲル状物質を
前記貯溜槽１１内に投入し、ここに貯蔵するよう
になつている。 In the mud production plant 10, there are storage tanks 11,
A stirring tank 15 is arranged above the storage tank 11 in which the recovery tank 12 and the separation tank 14 are arranged. A gel-like substance prepared by uniformly mixing the above-mentioned viscous substance, water, and preservative in this stirring tank 15 is put into the storage tank 11 and stored therein.
前記泥水供給ライン８はこの貯溜槽１１の吐出
端に接続され、そのライン８中に設けた圧送ポン
プP1により前記送泥管６側に送られる。 The mud water supply line 8 is connected to the discharge end of this storage tank 11, and is sent to the mud feeding pipe 6 side by a pressure pump P1 provided in the line 8.
送泥管６に対する接続直前の位置において、供
給ライン８にはゲル化剤供給ライン１６が接続さ
れている。この供給ライン１６の上部ャには漏斗
状の液槽１８およびバルブ２０が設けられてい
る。 A gelling agent supply line 16 is connected to the supply line 8 at a position immediately before connection to the mud feeding pipe 6 . A funnel-shaped liquid tank 18 and a valve 20 are provided in the upper part of the supply line 16.
バルブ２０を開けることにより液槽１８内に貯
えられていたゲル化剤は泥水供給ライン８内に加
えられ、この内部を輸送されるゲル化物質を含む
ゲル化泥水と合流する。 By opening the valve 20, the gelling agent stored in the liquid tank 18 is added to the muddy water supply line 8, and joins with the gelling muddy water containing the gelling substance transported therein.
含流したゲル化物質すなわちゲル化泥水は、最
先端位置に設けたラインミキサー２１内を通過す
ることにより十分混合され、高粘度化された状態
のゲル化泥水として送泥管６側を通じて、加圧室
３内に吐出することになる。 The gelled substance, that is, the gelled mud that has flowed in, is sufficiently mixed by passing through the line mixer 21 provided at the most advanced position, and is then added as gelled mud in a highly viscous state through the mud feeding pipe 6 side. It will be discharged into the pressure chamber 3.
加圧室３内ではカツターデイスク４を介して取
り入れられた掘削土と混合され、所定の圧力状態
を保つて切羽を保持する。 In the pressurizing chamber 3, it is mixed with excavated soil taken in through the cutter disk 4, and a predetermined pressure state is maintained to hold the face.
一方、前記回収用排泥管７の吐出端は、バルブ
７ａを介して回収用のラインミキサー２２の供給
端に対向位置している。ラインミキサー２２の上
には解ゲル化剤の液槽２３がバルブ２４を介して
接続されている。そして、ラインミキサー２２の
吐出端は回収ライン２６を通じて前記分離槽１４
に通じている。 On the other hand, the discharge end of the recovery sludge drainage pipe 7 is located opposite to the supply end of the recovery line mixer 22 via a valve 7a. A liquid tank 23 for a degelling agent is connected above the line mixer 22 via a valve 24 . The discharge end of the line mixer 22 is connected to the separation tank 14 through the recovery line 26.
It is familiar to
回収ライン２６内にはポンプP2が介在されて
おり、掘削土と高粘度化されたゲル化泥水との排
出混合物は、このポンプP2によりラインミキサ
ー２２を経て前記分離槽１４内に回収される。 A pump P 2 is interposed in the recovery line 26 , and the discharged mixture of excavated soil and highly viscous gelled mud is recovered into the separation tank 14 through the line mixer 22 by this pump P 2 . Ru.
そして、液槽２３内に貯蔵されている解ゲル化
剤をラインミキサー２２内に加えることにより、
混合物中のゲル状物質成分は解ゲル化し、ゲル化
泥水は、流体輸送に適した粘度に低粘度化した状
態で掘削土とともに回収ライン２６を通じて分離
槽１４側に排出される。 Then, by adding the degelling agent stored in the liquid tank 23 into the line mixer 22,
The gel-like substance component in the mixture is degelled, and the gelled mud water is discharged to the separation tank 14 side through the recovery line 26 together with the excavated soil in a state where the viscosity has been reduced to a level suitable for fluid transport.
分離槽１４内では主に比重差による分離が行な
われ、比重の軽い低粘度化されたゲル状物質を含
むゲル化泥水はポンプP1を介して前記回収槽１
２内に回収される。 Separation is mainly carried out in the separation tank 14 based on the difference in specific gravity, and gelled muddy water containing gel-like substances with low specific gravity and low viscosity is sent to the recovery tank 1 via the pump P1.
It will be collected within 2 days.
また、その残渣分である掘削土は分離槽１４の
底面よりホツパーなどを通じて外部に排出される
ことになる。ゲル状物質は無害であるため、排出
した掘削土は特に処理する必要がなく、埋立など
に転用できる。 Further, the excavated soil that is the residue is discharged from the bottom of the separation tank 14 to the outside through a hopper or the like. Since the gel-like substance is harmless, the excavated soil does not require any special treatment and can be used as a landfill.
さらに、回収槽１２の吐出端には合両ライン２
８が設けられ、前記泥水供給ライン８に合流して
いる。 Furthermore, a combination line 2 is provided at the discharge end of the recovery tank 12.
8 is provided and merges with the muddy water supply line 8.
この合流ライン２８内に設けたポンプP4によ
つて回収したゲル状物質を含むゲル化泥水は、再
び前記泥水供給ライン８を通じて加圧室３内へと
循環供給されることになる。 The gelled muddy water containing the gelled substance recovered by the pump P 4 provided in the merging line 28 is circulated and supplied into the pressurizing chamber 3 through the muddy water supply line 8 again.
以上のシステムに用いられるゲル状物質を構成
する前記粘性物質は、グアガムまたはローストビ
ンガムなどの植物性粘物質を単独あるいは併用し
たものであつて、いずれも水に溶解するとゲル状
の液体となる。このゲル状物質はアルカリ化剤に
よつてさらに高粘度化し、粘度が数万センチポイ
ズまで高められる。ゲル化剤は具体的には水酸化
ナトリウム，消石灰，炭酸ナトリウムなどのアル
カリ性物質である。回収後に加えられる解ゲル化
剤は、酸性物質であり、例えば硫酸ばん土，塩化
アルミニウム，希硫酸，希塩酸などが用いられ
る。 The viscous substance constituting the gel-like substance used in the above system is a vegetable viscous substance such as guar gum or roasted gum, either alone or in combination, and when dissolved in water, it becomes a gel-like liquid. The viscosity of this gel-like substance is further increased by the alkalizing agent, and the viscosity is increased to tens of thousands of centipoise. Gelling agents are specifically alkaline substances such as sodium hydroxide, slaked lime, and sodium carbonate. The degelling agent added after recovery is an acidic substance, such as sulfuric acid chloride, aluminum chloride, dilute sulfuric acid, dilute hydrochloric acid, and the like.
従つて、前記貯溜槽１１および回収槽１２内に
貯蔵されているゲル化物質あるいはゲル化泥水は
中性ないし弱酸性側となり、解ゲル化した状態で
貯溜されている。これにより、前記作泥プラント
１０とシールド掘進機１までの距離が遠く、泥水
供給ライン８の長さが長い場合であつても十分に
送泥を行なうことができる。そして、シールド掘
進機１に対する供給直前において前述のゲル化剤
に加え混合するので、ここで高粘度化した状態で
比較的短距離の送泥室６を通じて加圧室３内に吐
出することになる。送泥管６内での輸送が困難な
場合には、送泥室６に圧力空気を圧送すればスム
ーズな送泥を行うことができる。 Therefore, the gelled substance or gelled muddy water stored in the storage tank 11 and the recovery tank 12 is neutral to weakly acidic, and is stored in a degelled state. Thereby, even if the distance between the mud making plant 10 and the shield excavator 1 is long and the length of the mud water supply line 8 is long, sufficient mud can be fed. Since it is added to and mixed with the above-mentioned gelling agent immediately before being supplied to the shield excavator 1, it is discharged into the pressurizing chamber 3 through the relatively short distance mud feeding chamber 6 in a highly viscous state. . If transportation within the mud feeding pipe 6 is difficult, smooth mud feeding can be achieved by force-feeding pressurized air to the mud feeding chamber 6.
高粘度化したゲル化泥水は、加圧室３内で所定
の圧力を伴つて切羽に対向し、またカツターデイ
スク４により取り込まれた削土と混合する。 The highly viscous gelled mud is opposed to the face with a predetermined pressure within the pressurizing chamber 3, and is mixed with the excavated soil taken in by the cutter disk 4.
前記加圧室３内には図示しない圧力センサが設
けられ、この圧力センサの検出出力に応じて各バ
ルブ６ａ，７ａ，２０，２４の開閉制御、および
各ポンプP1〜P4の駆動制御がなされる。 A pressure sensor (not shown) is provided in the pressurizing chamber 3, and the opening/closing control of each valve 6a, 7a, 20, 24 and the drive control of each pump P1 to P4 are controlled according to the detection output of this pressure sensor. It will be done.
すなわち、加圧室３内の検出圧力が得ようとす
る土水圧よりも低い場合、バルブ６ａ，２０は
開、バルブ７ａ，２４は閉状態であり、ポンプ
P1またはP4は駆動し、高粘度化したゲル化泥水
を送り続ける。 That is, when the detected pressure in the pressurizing chamber 3 is lower than the soil water pressure to be obtained, the valves 6a and 20 are open, the valves 7a and 24 are closed, and the pump is closed.
P 1 or P 4 is driven and continues to send highly viscous gelled mud.
また、加圧室３内の土水圧が設定値より高くな
ると、バルブ６ａ，２０は閉じ、ポンプP1，P4
は停止し、その代りにバルブ７ａ，２４が開き、
ポンプP2が駆動し、加圧室３内のゲル化泥水と
削土の混合物を排泥管７を通じて加圧室３の後部
に送る。 Further, when the soil water pressure in the pressurizing chamber 3 becomes higher than the set value, the valves 6a and 20 are closed, and the pumps P 1 and P 4 are closed.
stops, and instead valves 7a and 24 open,
Pump P 2 is driven, and the mixture of gelled mud and excavated soil in pressurization chamber 3 is sent to the rear of pressurization chamber 3 through mud drain pipe 7 .
そして、ラインミキサー２２内で解ゲル化剤と
混合することにより、混合物中の高粘度化したゲ
ル化泥水は解ゲル化し、低粘度化する。しかしな
がら、この状態においても掘削土に対するバイン
ダとして機能は変らないので、回収ライン２６を
通じて作泥プラント１０側へ流体輸送できる。 Then, by mixing with a degelling agent in the line mixer 22, the highly viscous gelled mud in the mixture is degelled and reduced in viscosity. However, even in this state, the function as a binder for excavated soil does not change, so the fluid can be transported to the mud production plant 10 side through the recovery line 26.
なお、ゲル化泥水の粘度を制御するには、泥水
供給ライン８の先端に粘度センサを設け、この粘
度センサの検出出力に応じて液槽１８に付設され
たバルブの開度をフイードバツク制御すれば、地
盤の地質に応じて精度のよい粘度管理を行なうこ
とができる。 In addition, in order to control the viscosity of the gelled mud, a viscosity sensor is provided at the tip of the muddy water supply line 8, and the opening degree of the valve attached to the liquid tank 18 is feedback-controlled in accordance with the detection output of this viscosity sensor. , it is possible to perform accurate viscosity control according to the geology of the ground.
また、回収側においても同様にフイードバツク
制御により輸送に適した粘度に下げることができ
る。 Furthermore, on the recovery side, the viscosity can be lowered to a value suitable for transportation by feedback control.
さらに、加圧室３から排出された混合物は排出
直後に低粘度化するのでなく、作泥プラント１０
に近い位置で低粘度化するようにしてもよい。つ
まり、ラインミキサー２２および液槽は回収ライ
ン２６の任意の位置に設けてもよい。 Furthermore, the mixture discharged from the pressurizing chamber 3 does not have a low viscosity immediately after discharge, but the mixture discharged from the mud production plant 10
The viscosity may be lowered at a position close to . That is, the line mixer 22 and the liquid tank may be provided at any position in the recovery line 26.
〈発明の効果〉
以上各実施例により詳細に説明したように、こ
の発明の泥水シールド工法にあつては、従来のベ
ントナイトを主成分とする粘土を用いた泥水シー
ルド工法に比して、加圧室内での粘度が大（逸泥
量が少なく）で、しかも輸送に適した粘度で供
給・回収できる。<Effects of the Invention> As explained in detail in each of the embodiments above, the muddy water shield method of the present invention has a lower pressurized water shielding method than the conventional muddy water shielding method using clay mainly composed of bentonite. It has a high viscosity indoors (low amount of sludge lost) and can be supplied and collected at a viscosity suitable for transportation.
さらに、この発明にあつては、従来に比べて回
収した削土および泥水の混合物の分離が可能であ
り、しかも分離後のゲル化泥水を反復して供給ラ
イン中に投入できるため消費量が少なく、経費が
節減できる。 Furthermore, with this invention, it is possible to separate the mixture of recovered excavated soil and mud water compared to the conventional method, and furthermore, the gelled mud water after separation can be repeatedly fed into the supply line, resulting in less consumption. , costs can be saved.
図はこの発明に係る泥水シールド工法に適用さ
れるゲル化泥水の供給・回収システムを示す説明
図である。
１……シールド掘進機、３……加圧室、４……
カツターデイスク、６，７……送泥管、８……泥
水供給ライン、９……シールド抗、１０……作泥
プラント、１１……貯溜槽、１６……ゲル化剤供
給ライン、１８，２３……液槽、２１，２２……
ラインミキサー、２６……回収ライン。
The figure is an explanatory diagram showing a gelled mud water supply/recovery system applied to the mud water shield method according to the present invention. 1... Shield tunneling machine, 3... Pressurized chamber, 4...
Cutter disk, 6, 7... Sludge feed pipe, 8... Mud water supply line, 9... Shield pit, 10... Sludge production plant, 11... Storage tank, 16... Gelling agent supply line, 18, 23...Liquid tank, 21, 22...
Line mixer, 26... Collection line.
Claims (1)
該泥水の圧力により切羽の安定を図るとともに、
加圧室内に取り入れられた掘削土を流動化させた
状態で該掘削土および泥水の混合物を前記掘進機
の後方に排出するようにした泥水シールド工法に
おいて、前記泥水としてゲル状物質を含むゲル化
泥水を用い、該ゲル化泥水を加圧室に供給する直
前にゲル化剤を添加混合するとともに、加圧室か
ら排出された掘削土と前記ゲル化泥水とからなる
混合物に解ゲル化剤を添加することを特徴とする
泥水シールド工法。1. The muddy water is forced into the pressurized chamber of the shield tunneling machine, and the pressure of the muddy water stabilizes the face.
In a mud water shield construction method in which excavated soil taken into a pressurizing chamber is fluidized and a mixture of the excavated soil and mud water is discharged to the rear of the excavator, the mud water contains a gelatinous substance. Using muddy water, a gelling agent is added and mixed immediately before supplying the gelled muddy water to the pressurizing chamber, and a degelling agent is added to the mixture consisting of the excavated soil discharged from the pressurizing chamber and the gelled muddy water. A mud water shield method characterized by the addition of mud water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61113446A JPS62270680A (en) | 1986-05-20 | 1986-05-20 | Slurry shield tunneling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61113446A JPS62270680A (en) | 1986-05-20 | 1986-05-20 | Slurry shield tunneling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62270680A JPS62270680A (en) | 1987-11-25 |
| JPH054430B2 true JPH054430B2 (en) | 1993-01-20 |
Family
ID=14612435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61113446A Granted JPS62270680A (en) | 1986-05-20 | 1986-05-20 | Slurry shield tunneling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62270680A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009179971A (en) * | 2008-01-29 | 2009-08-13 | Ohbayashi Corp | Excavated soil disposal method and processing water |
| JP4939474B2 (en) * | 2008-03-31 | 2012-05-23 | 前田建設工業株式会社 | Preventing face collapse in muddy water shield |
| CN105041327B (en) * | 2015-08-27 | 2017-12-19 | 北京建工土木工程有限公司 | Bored tunnel is counter to dig shield method of reseptance |
-
1986
- 1986-05-20 JP JP61113446A patent/JPS62270680A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62270680A (en) | 1987-11-25 |
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