JP7498493B2 - A method of filling the joints of steel pipe sheet piles with grout material after discharging soil from the joints. - Google Patents

A method of filling the joints of steel pipe sheet piles with grout material after discharging soil from the joints. Download PDF

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JP7498493B2
JP7498493B2 JP2021177408A JP2021177408A JP7498493B2 JP 7498493 B2 JP7498493 B2 JP 7498493B2 JP 2021177408 A JP2021177408 A JP 2021177408A JP 2021177408 A JP2021177408 A JP 2021177408A JP 7498493 B2 JP7498493 B2 JP 7498493B2
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明彦 山口
浩一 武山
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株式会社 水明グラウト
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Description

本発明は、地中に挿入された鋼管矢板の継手内処理に関する。継手内処理とは、鋼管矢板の継手セクション内に詰まっている土砂（砂礫地盤など）を排土・洗浄した後、継手内にグラウト材（モルタル等を含む）を充填して鋼管継手の結合性と遮水性を付加する工事である。鋼管矢板の継手には様々な型式のものがある。例えば、ハイパージャンクションという型式の継手は、その継手管が比較的大きく管内面が縞鋼板であるため、高強度のグラウト材を充填することができるものである。 The present invention relates to the treatment of the joints of steel pipe sheet piles inserted into the ground. The treatment of the joints involves removing and cleaning the soil (gravel ground, etc.) that has accumulated in the joint section of the steel pipe sheet pile, and then filling the joint with grout material (including mortar, etc.) to improve the bondability and water resistance of the steel pipe joint. There are various types of joints for steel pipe sheet piles. For example, the type of joint known as hyper junction has a relatively large joint pipe with a checkered steel plate inner surface, which makes it possible to fill it with high-strength grout material.

複数の鋼管矢板を群杭として井筒形式に連結させてなる「鋼管矢板基礎」を構築する際に剛性を確保するために、鋼管矢板の連結部である継手内から土砂を排出させて良質なグラウト材と置き換えると、継手のせん断強度を高めることができる。継手処理を確実に行うために継手内に詰まっている土砂を充分に排土し洗浄することが重要である。 When constructing a "steel pipe sheet pile foundation" consisting of multiple steel pipe sheet piles connected in a shaft well configuration as a group pile, the shear strength of the joints can be increased by removing the soil from inside the joints, which are the connecting parts of the steel pipe sheet piles, and replacing it with high-quality grout material to ensure rigidity. To ensure proper joint treatment, it is important to thoroughly remove and clean the soil that has become lodged inside the joints.

しかし以前は、継手内に硬質な砂質土や砂礫土などが詰まっている場合や継手長が３０ｍ以上ある場合には、排土用の高圧ホースの噴射ノズルの位置決めを工夫してもジェット水の絶対量の不足により排土・洗浄を充分に行うことができなかった。 However, in the past, when the joint was clogged with hard sandy soil or gravel, or when the joint was longer than 30 m, the absolute amount of jet water was insufficient to adequately remove and clean the soil, even if the positioning of the spray nozzle of the high-pressure hose used for soil removal was devised.

つまり以前の土砂の排出方法においては、土砂の切削能力を重視して高圧ホースの先端の噴射孔の口径を小さくすると、切削能力は大きくなるが、土砂を継手上部の開口まで上昇させるための高圧水の噴射水量が小さく水勢が弱いので、深い場所にある土砂を排出させる能力が低下してしまう。その一方で、切削された土砂の排出能力を重視して継手内へ大量の水を注入し、継手上部の開口へ向かって上昇する水の流れを強めるために高圧ホース先端の噴射孔の口径を大きくすると、これに反比例して、水の噴射圧が低下して土砂を切削する能力が低下してしまう。 In other words, in previous methods of discharging soil and sand, if the diameter of the nozzle at the end of the high-pressure hose was reduced in order to prioritize the ability to cut the soil and sand, the cutting ability would increase, but the amount of high-pressure water sprayed to raise the soil and sand to the opening at the top of the joint was small and the water force was weak, reducing the ability to discharge soil that was deep. On the other hand, if a large amount of water was injected into the joint in order to prioritize the ability to discharge the cut soil and the diameter of the nozzle at the end of the high-pressure hose was increased to strengthen the flow of water rising toward the opening at the top of the joint, the water spray pressure would decrease in inverse proportion to this, reducing the ability to cut the soil and sand.

そこで特許文献１に開示されているような二重供給管を用いることにより、鋼管矢板の継手内に詰まっている土砂を充分に排出させることができるようになった。 Therefore, by using a double supply pipe as disclosed in Patent Document 1, it became possible to sufficiently discharge the soil and sand that had become clogged in the joints of the steel pipe sheet pile.

図４は、特許文献１に記載の二重管洗浄システムと、グラウト材（モルタル等を含む）充填システムを示している。最初に、図４の左側に示される洗浄システムを使って排土・洗浄を行う。従来の排土・洗浄の手順としては、（１）自動給水装置にてタンク内に貯水する、（２）洗浄ポンプを始動させ、圧力の確認を行って先端まで送水する、（３）コンプレッサを始動させ、二重管の先端まで圧縮空気を圧送する、（４）超高圧二重管スイベルと二重管ロッドを経由して先端へ圧送し、継手内の土砂（砂礫地盤など）を掘削・排土する、であった。 Figure 4 shows the double-pipe cleaning system and grout material (including mortar, etc.) filling system described in Patent Document 1. First, soil removal and cleaning are performed using the cleaning system shown on the left side of Figure 4. The conventional soil removal and cleaning procedure is as follows: (1) Water is stored in a tank using an automatic water supply device, (2) The cleaning pump is started, the pressure is checked, and water is sent to the tip, (3) The compressor is started, and compressed air is pumped to the tip of the double pipe, and (4) The soil (gravel ground, etc.) in the joint is excavated and removed by pumping it through an ultra-high pressure double pipe swivel and double pipe rod to the tip.

続いて、図４の右側に示されるグラウト材充填システムを使ってグラウト材を投入する。従来のグラウト材投入の手順としては、（５）充填パイプを継手下端まで挿入する、（６）タンクに貯水した水を水量計で計量してミキサーへ投入する、（７）ミキサーを始動させ、プレミックスグラウト材を加える、（８）グラウト材ポンプを始動させ、流量と圧力を確認しながら、（９）充填ポンプを介してグラウト材を継手内に充填する、であった。 Next, the grout is poured in using the grout filling system shown on the right side of Figure 4. The conventional procedure for pouring grout is as follows: (5) insert the filling pipe to the bottom end of the joint, (6) measure water stored in a tank with a water meter and pour it into the mixer, (7) start the mixer and add the premixed grout, (8) start the grout pump, and while checking the flow rate and pressure, (9) fill the joint with the grout via the filling pump.

特許第５６９３５２０号公報Japanese Patent No. 5693520

特許文献１に記載の方法によれば、二重管ロッドを用いて排土・洗浄の作業を行った後、単管構造である鋼製のグラウト材充填管（ロッド）に吊り替えてから、継手の下端（一例として、約５０ｍ～７０ｍの深さ）まで挿入し、グラウト材の充填を行っていた。これまで、この吊り替え作業に約２０分間～３０分間もの時間を要していた。このため、二重供給管５を使って土砂を排出させても、継手内から二重供給管５を引き抜いた後に周囲の土砂が流れ込んで堆積してしまうことがあり、継手内に大量の土砂が堆積すると、その後にグラウト材充填管を継手内へ挿入できないという問題があった。つまり、背面地盤が自立せずに継手のスリットからの土砂流入が過大になると、グラウト材充填管を挿入することができず、再び二重管ロッドを継手内へ挿入して洗浄することを繰り返さなければならなかった。 According to the method described in Patent Document 1, after the soil removal and cleaning work was performed using a double-tube rod, it was replaced with a single-tube steel grout-filled pipe (rod) and then inserted to the lower end of the joint (for example, to a depth of about 50 m to 70 m) and grout was filled. Until now, this replacement work took about 20 to 30 minutes. Therefore, even if the soil was discharged using the double-tube supply pipe 5, the surrounding soil and sand may flow in and accumulate after the double-tube supply pipe 5 is pulled out of the joint, and if a large amount of soil and sand accumulates in the joint, there was a problem that the grout-filled pipe could not be inserted into the joint afterwards. In other words, if the back ground was not self-supporting and the inflow of soil and sand from the slit of the joint became excessive, it was not possible to insert the grout-filled pipe, and it was necessary to insert the double-tube rod into the joint again and repeat the cleaning process.

また、トレミー状態において、グラウト材を充填する途中で継手の下方から土砂が流入する場合にも、グラウト材の上方まで不純物が混入してグラウト材による強度や水密性が低下してしまうことがある。 In addition, when in a tremie state, if soil and sand flow into the joint from below while filling the grout material, impurities may get into the upper part of the grout material, reducing the strength and watertightness of the grout material.

鋼管矢板の継手内へ流れ込む不純物の量を最小限に抑えるために、排土後に素早くグラウト材の投入に切り替えることが望ましい。 In order to minimize the amount of impurities that flow into the joints of the steel pipe sheet piles, it is desirable to switch to adding grout material quickly after removing the soil.

一実施例においては、鋼管矢板の継手内から土砂を排出させた後にグラウト材を充填する方法であって、高圧の空気を通流させることができるように構成された空気供給路と、該空気供給路の内周側に配置され高圧水を通流させることができるように構成された高圧水供給路とからなる二重供給管を継手内へ前進させるステップと、高圧水供給路の噴射口から高圧水を噴射させるステップと、継手内から二重供給管を引き抜くことなく高圧水供給路を通して高圧水の代わりに継手内へグラウト材を圧送するステップと、を含む方法を提示する。 In one embodiment, a method for filling grout material after draining soil from a joint of a steel pipe sheet pile is presented, which includes the steps of advancing a double supply pipe into the joint, the double supply pipe being made up of an air supply passage configured to allow high-pressure air to flow and a high-pressure water supply passage arranged on the inner periphery of the air supply passage and configured to allow high-pressure water to flow, spraying high-pressure water from a nozzle of the high-pressure water supply passage, and pumping grout material into the joint through the high-pressure water supply passage instead of high-pressure water without pulling out the double supply pipe from inside the joint.

また、グラウト材を圧送するステップにおいて、グラウト材の濁度に応じて圧送の圧力を変化させることをさらに含む。 The step of pumping the grout material further includes varying the pumping pressure depending on the turbidity of the grout material.

さらには、高圧水又はグラウト材が噴射口から噴射されるときに加速するように、噴射口に絞りが形成されていることを特徴とする。 Furthermore, a constriction is formed in the nozzle so that the high-pressure water or grout material is accelerated when it is sprayed from the nozzle.

他の実施例においては、グラウト材の濁度に応じて圧送の圧力を変化させることは、絞りの径寸法を変化させることによる。 In another embodiment, the pumping pressure is varied in response to the turbidity of the grout material by varying the diameter of the restriction.

さらなる実施例においては、高圧水を噴射させるステップは、空気供給路を通流して噴射される空気に同伴されつつ噴射される高圧水を使って継手内から土砂を排出させることをさらに含む。 In a further embodiment, the step of injecting high pressure water further includes discharging sediment from within the joint using high pressure water that is entrained in the injected air through the air supply passage.

鋼管矢板の継手内から排土する様子を示す図。A diagram showing the process of soil being removed from inside a steel pipe sheet pile joint. （ａ）二重供給管と先端ノズルを概略的に示す図。（ｂ）ビット付き先端ノズルの一部を切り欠いて示す図。1A is a schematic diagram of a double feed pipe and a tip nozzle, and FIG. 1B is a cutaway diagram of a tip nozzle with a bit. 継手内に二重供給管が挿入されている状態を示す図。FIG. 13 is a diagram showing a state in which a double supply pipe is inserted into a joint. 従来法における洗浄システム及びグラウト材充填システムを示す図。FIG. 1 is a diagram showing a cleaning system and a grout filling system according to a conventional method.

本発明の方法について、添付の図を参照しつつ以下に説明する。図１は、地中１に挿入された鋼管矢板２の継手３内から二重供給管５を用いて排土する様子を示している。 The method of the present invention will be described below with reference to the attached drawings. Figure 1 shows how a double supply pipe 5 is used to remove soil from within a joint 3 of a steel pipe sheet pile 2 inserted into the ground 1.

図２（ａ）に示されているように、圧縮空気１７が二重供給管５の外周側の空気供給路９を通流して、先端ノズル１０の噴射孔１１から概ね矢印Ａ方向へ吐出される。また、二重供給管５の内周側の高圧水１６と外周側の空気１７を同時に噴射させると、高圧水１６が土砂の切削に適した水圧に維持され、圧縮空気１７のエアリフト効果を利用して効率良く排土することが可能となる。 As shown in FIG. 2(a), compressed air 17 flows through the air supply passage 9 on the outer periphery of the double supply pipe 5 and is discharged from the injection hole 11 of the tip nozzle 10 in the direction of arrow A. In addition, when high-pressure water 16 on the inner periphery of the double supply pipe 5 and air 17 on the outer periphery are simultaneously injected, the high-pressure water 16 is maintained at a water pressure suitable for cutting soil and sand, and the air lift effect of the compressed air 17 can be utilized to efficiently remove soil.

さらに二重供給管５の外周壁に１つ又は複数の逆止弁１３が設けられている場合には、外周側の空気供給路９に圧縮空気１７が通流するときに上方へ開いて矢印Ｂ方向へ空気１７を吐出させることができるため、高い排土効率が得られるという利点がある。 Furthermore, if one or more check valves 13 are provided on the outer wall of the double supply pipe 5, they can open upward when compressed air 17 flows through the air supply passage 9 on the outer periphery, allowing the air 17 to be discharged in the direction of arrow B, which has the advantage of providing high soil discharge efficiency.

また図２（ｂ）に示されるように、土質が硬質である場合には噴射ノズルの先端に切削用ビット１８を有する先端ノズル１０’に付け替えて、二重供給管５を軸回転させながら継手内へ挿入し、噴射ノズルから高圧水（一例においては、約０．９ＭＰａ～４０．０ＭＰａ）を矢印Ｃ方向へ噴射させつつ切削用ビット１８を使って継手内の土砂を切削することもできる。すなわち、ビット付き先端ノズル１０’の噴射口１４から超高圧水を吐出させながらボーリング機の回転と推進力を利用して砂礫地盤を切削・排土する。 Also, as shown in FIG. 2(b), if the soil is hard, the tip of the injection nozzle can be replaced with a tip nozzle 10' having a cutting bit 18 at its tip, and the double supply pipe 5 can be inserted into the joint while rotating on its axis, and the soil inside the joint can be cut using the cutting bit 18 while high-pressure water (approximately 0.9 MPa to 40.0 MPa in one example) is injected from the injection nozzle in the direction of arrow C. In other words, the rotation and propulsion force of the boring machine are used to cut and remove the gravel ground while ultra-high-pressure water is ejected from the injection port 14 of the tip nozzle 10' with bit.

継手３の上部の開口３ａ付近の浅い箇所の土砂を排出させる場合においては、先端ノズル１０，１０’の噴射孔１１から噴射させている水１６の流れに乗せて土砂４を上昇させ、継手３の開口３ａから排出させることもある。つまり、空気１７を噴射することなく、水１６の流水力だけで土砂４を上昇させ、継手３の開口３ａから排出させる場合もある。 When discharging soil from shallow areas near the opening 3a at the top of the joint 3, the soil 4 may be lifted by the flow of water 16 sprayed from the nozzle holes 11 of the tip nozzles 10, 10' and discharged from the opening 3a of the joint 3. In other words, the soil 4 may be lifted by the hydraulic force of the water 16 alone, without spraying air 17, and discharged from the opening 3a of the joint 3.

鋼管矢板の継手内を洗浄した後、切替え弁などを使うことにより素早くグラウト材１６’の投入に切り替えることが可能となる。一実施例においては、継手内処理専用のグラウト材料が使用され得る。専用のグラウト材料とは、例えば、従来の施工方法で用いられているグラウト材の代わりに、セメントを含む骨材や混和剤が撹拌処理されたものである。 After cleaning the inside of the joints of the steel pipe sheet pile, it is possible to quickly switch to the injection of grout material 16' by using a switching valve or the like. In one embodiment, a grout material specifically for processing inside the joints can be used. The specific grout material is, for example, a mixture of aggregate and admixtures containing cement, instead of the grout material used in conventional construction methods.

一実施例においては、高圧水１６又はグラウト材１６’が噴射口１４から噴射されるときに適度に加速するように、噴射口１４に絞り（隘路）１５が形成されている。 In one embodiment, a narrowing (narrow passage) 15 is formed in the nozzle 14 so that the high-pressure water 16 or grout material 16' is appropriately accelerated when it is sprayed from the nozzle 14.

また、グラウト材１６’を圧送するステップにおいて、グラウト材１６’懸濁液の濁度に応じて圧送の圧力を変化させるとよい。一実施例においては、濁度の低いグラウト材１６’を圧送する場合には５ＭＰａ程度の圧力とする一方で、濁度の高いグラウト材１６’を圧送する場合には２０ＭＰａ程度の圧力とする。他の実施例においては、グラウト材１６’を圧送するために約２０ＭＰａ～４０ＭＰａの圧力を加える場合もある。 In addition, in the step of pumping the grout material 16', the pumping pressure may be changed depending on the turbidity of the grout material 16' suspension. In one embodiment, a pressure of about 5 MPa is used when pumping a grout material 16' with low turbidity, while a pressure of about 20 MPa is used when pumping a grout material 16' with high turbidity. In other embodiments, a pressure of about 20 MPa to 40 MPa may be applied to pump the grout material 16'.

一実施例においては、グラウト材１６’の濁度に応じて圧送の圧力を変化させることは、高圧水供給管６を介して、二重供給管５の高圧水供給路８へ供給されるべきグラウト材１６’を圧送するときの源の圧力を変化させることによる。 In one embodiment, the pumping pressure is changed according to the turbidity of the grout material 16' by changing the source pressure when pumping the grout material 16' to be supplied to the high-pressure water supply line 8 of the double supply pipe 5 via the high-pressure water supply pipe 6.

或いは、グラウト材１６’の濁度に応じて圧送の圧力を変化させることは、噴射口１４に形成された絞り（隘路）１５の径寸法（一例として４０.５ｍｍ～６０．５ｍｍ）を変化させることによる。絞り１５の径寸法を変化させるために、別の径寸法を有する絞り１５に交換する（付け替える）場合もあれば、絞り１５の径寸法を機械的に変化させる場合もある。 Alternatively, the pumping pressure can be changed according to the turbidity of the grout material 16' by changing the diameter (for example, 40.5 mm to 60.5 mm) of the restriction (narrow passage) 15 formed in the injection port 14. To change the diameter of the restriction 15, it may be replaced (replaced) with a restriction 15 having a different diameter, or the diameter of the restriction 15 may be changed mechanically.

図３は、継手内に二重供給管が挿入されている状態を示す。二重供給管５の高圧水供給路８が耐圧性の材料から形成されていると、土砂の切削用に供給されるべき高圧水１６をさらに高圧にすることができ、噴射口１４の口径を大きくしても土砂の切削能力を低下させることなく土砂の排出に必要な噴射水量を保つことができ、短時間で継手内から大量の土砂を排出させることが可能となる。二重供給管５の外周側の空気供給路９も耐圧性の素材で形成されていれば、切削済みの土砂を上昇させる空気１７の送気量と送気圧を高めることができる。すなわち、継手３内に噴射される高圧水１６が空気１７の気泡に同伴されることによって、継手上部の開口３ａへ向かって勢いよく土砂を上昇させて継手３内から短時間で排出させることができる。 Figure 3 shows the state in which the double supply pipe is inserted into the joint. If the high-pressure water supply passage 8 of the double supply pipe 5 is made of a pressure-resistant material, the high-pressure water 16 to be supplied for cutting the soil can be made even higher pressure, and even if the diameter of the nozzle 14 is increased, the amount of water required to discharge the soil can be maintained without reducing the soil cutting ability, making it possible to discharge a large amount of soil from inside the joint in a short time. If the air supply passage 9 on the outer periphery of the double supply pipe 5 is also made of a pressure-resistant material, the amount and pressure of the air 17 that lifts the cut soil can be increased. In other words, the high-pressure water 16 sprayed into the joint 3 is entrained with bubbles of air 17, so that the soil can be lifted vigorously toward the opening 3a at the top of the joint and discharged from the joint 3 in a short time.

さらなる実施例においては、グラウト材１６’を圧送するステップの後に、高圧水供給路８に再び高圧水１６を通流させることにより高圧水供給路８内を洗浄することを含む。この洗浄により、高圧水供給路８内に残留するグラウト材が固まってしまうことを防ぐ。一例においては、継手内にグラウト材を充填した後、継手内から二重供給管５を引き抜き、再び切替え弁などを使って高圧水による洗浄を開始させるとよい。 In a further embodiment, after the step of pumping the grout material 16', the high-pressure water supply line 8 is cleaned by passing the high-pressure water 16 through the high-pressure water supply line 8 again. This cleaning prevents the grout material remaining in the high-pressure water supply line 8 from solidifying. In one example, after filling the joint with grout material, the double supply pipe 5 is pulled out from the joint, and cleaning with high-pressure water is started again using a switching valve or the like.

以上のように、従来は二重管洗浄システム６０からグラウト材充填管７４に吊り替えるのに少なくとも２０分間～３０分間を要していたところ、本発明の方法によれば、排土・洗浄後に素早くグラウト材１６’を投入し始めることができるので、継手３内に土砂が混入してしまうことがほとんどない。仮に、継手３内に多少の土砂が混入したとしても、グラウト材１６’を高圧で噴射させることにより、混入した土砂とグラウト材１６’とが充分に撹拌されるので、継手内に充填されたグラウト材１６’の強度や水密性が大きく低下してしまうことがない。 As described above, in the past, it took at least 20 to 30 minutes to switch from the double pipe cleaning system 60 to the grout-filled pipe 74, but according to the method of the present invention, the grout material 16' can be quickly poured in after the soil is removed and cleaned, so soil is hardly mixed into the joint 3. Even if some soil is mixed into the joint 3, the grout material 16' is sprayed at high pressure to sufficiently mix the mixed soil and the grout material 16', so that the strength and watertightness of the grout material 16' filled in the joint are not significantly reduced.

１…地中
２…鋼管矢板
３…継手
３ａ…（継手の）開口
４…土砂
５…二重供給管
６…高圧水供給管
７…空気供給管
８…高圧水供給路
９…空気供給路
１０…先端ノズル
１０’…ビット付き先端ノズル
１１…噴射孔
１３…逆止弁
１４…噴射口
１５…絞り（隘路）
１６…（高圧）水
１６’…グラウト材
１７…（圧縮）空気
１８…切削用ビット
１９…吊り用ワイヤ
５０…二重管高圧スイベル
５２…高圧水
５４…空気
５６…外管（エアー用）
５８…内管（高圧水用）
６０…二重管洗浄システム
６２…空気噴射部（逆止弁付き）
６４…高圧水噴射部（ジェットノズル）
７０…充填スイベル
７２…グラウト材（モルタル等を含む）
７４…グラウト材充填管 1...underground 2...steel pipe sheet pile 3...joint 3a...(joint) opening 4...soil 5...double supply pipe 6...high pressure water supply pipe 7...air supply pipe 8...high pressure water supply passage 9...air supply passage 10...tip nozzle 10'...tip nozzle with bit 11...jet hole 13...check valve 14...jet nozzle 15...throttle (narrow passage)
16... (High pressure) water 16'... grout material 17... (Compressed) air 18... cutting bit 19... hanging wire 50... double pipe high pressure swivel 52... high pressure water 54... air 56... outer pipe (for air)
58...Inner pipe (for high pressure water)
60: Double-pipe cleaning system 62: Air injection section (with check valve)
64...High pressure water injection part (jet nozzle)
70: Filling swivel 72: Grout material (including mortar, etc.)
74...Grout filling pipe

Claims (5)

鋼管矢板の継手内から土砂を排出させた後にグラウト材を充填する方法であって、
高圧の空気を通流させることができるように構成された空気供給路と、該空気供給路の内周側に配置され高圧水を通流させることができるように構成された高圧水供給路とからなる二重供給管を上記継手内へ前進させるステップと、
上記高圧水供給路の噴射口から高圧水を噴射させるステップと、
上記継手内から上記二重供給管を引き抜くことなく上記高圧水供給路を通して上記高圧水の代わりにグラウト材を２０ＭＰａ～４０ＭＰａの圧力で上記継手内へ圧送するステップと、
上記継手内にグラウト材を充填した後、上記継手内から上記二重供給管を引き抜くステップと、
上記高圧水供給路に再び高圧水を通流させることにより上記高圧水供給路内を洗浄するステップと、
を含む方法。 A method for filling a joint of a steel pipe sheet pile with grout material after discharging soil from the joint, comprising the steps of:
a step of advancing a double supply pipe including an air supply passage configured to allow high-pressure air to flow and a high-pressure water supply passage disposed on the inner periphery side of the air supply passage and configured to allow high-pressure water to flow, into the joint;
Injecting high-pressure water from an injection port of the high-pressure water supply passage;
A step of pumping a grout material into the joint at a pressure of 20 MPa to 40 MPa through the high-pressure water supply path instead of the high-pressure water without pulling out the double supply pipe from inside the joint;
After filling the joint with grout material, extracting the dual supply pipe from the joint;
a step of washing the inside of the high-pressure water supply passage by passing high-pressure water through the high-pressure water supply passage again;
The method includes: 上記グラウト材を圧送するステップにおいて、グラウト材の濁度に応じて圧送の圧力を変化させることをさらに含む、請求項１に記載の方法。 The method of claim 1, further comprising varying the pumping pressure in response to the turbidity of the grout material in the step of pumping the grout material. 上記高圧水又は上記グラウト材が上記噴射口から噴射されるときに加速するように、上記噴射口に絞りが形成されていることを特徴とする、請求項２に記載の方法。 The method according to claim 2, characterized in that a constriction is formed in the nozzle so that the high-pressure water or the grout material is accelerated when it is sprayed from the nozzle. 上記グラウト材の濁度に応じて圧送の圧力を変化させることは、上記絞りの径寸法を変化させることによる、請求項３に記載の方法。 The method according to claim 3, wherein the pumping pressure is changed according to the turbidity of the grout material by changing the diameter of the restriction. 上記高圧水を噴射させるステップは、上記空気供給路を通流して噴射される空気に同伴されつつ噴射される高圧水を使って上記継手内から土砂を排出させることをさらに含む、請求項１～４のいずれかに記載の方法。 The method according to any one of claims 1 to 4, wherein the step of injecting the high-pressure water further includes discharging soil and sand from within the joint using high-pressure water that is injected while being entrained by the air that is injected through the air supply passage.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007056477A (en) 2005-08-23 2007-03-08 Toko Corp High-pressure jetting type grouting method
JP2012158981A (en) 2012-05-28 2012-08-23 Suimei Grout Corp Discharge method of sediment inside joint of steel pipe sheet pile
JP2013108352A (en) 2008-04-06 2013-06-06 Maeda Corp Construction method of underground consolidated body and underground consolidated body construction device which uses the same to construct consolidated body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007056477A (en) 2005-08-23 2007-03-08 Toko Corp High-pressure jetting type grouting method
JP2013108352A (en) 2008-04-06 2013-06-06 Maeda Corp Construction method of underground consolidated body and underground consolidated body construction device which uses the same to construct consolidated body
JP2012158981A (en) 2012-05-28 2012-08-23 Suimei Grout Corp Discharge method of sediment inside joint of steel pipe sheet pile

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