JP5693520B2 - Method for discharging earth and sand inside the joint of steel pipe sheet piles - Google Patents

Method for discharging earth and sand inside the joint of steel pipe sheet piles Download PDF

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JP5693520B2
JP5693520B2 JP2012121281A JP2012121281A JP5693520B2 JP 5693520 B2 JP5693520 B2 JP 5693520B2 JP 2012121281 A JP2012121281 A JP 2012121281A JP 2012121281 A JP2012121281 A JP 2012121281A JP 5693520 B2 JP5693520 B2 JP 5693520B2
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sand
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明彦 山口
明彦 山口
浩一 武山
浩一 武山
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株式会社 水明グラウト
株式会社 水明グラウト
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Description

本発明は、鋼管矢板を地中に挿入した際、同鋼管矢板の継手内部に浸入した土砂を排出するための土砂の排出方法に関する。   The present invention relates to a method for discharging earth and sand for discharging earth and sand that has entered a joint of the steel pipe sheet pile when the steel pipe sheet pile is inserted into the ground.

従来、地中に挿入した鋼管矢板の継手内部に詰まっている土砂は、高圧ホースの先端から高圧水を噴射しながら同高圧ホースを継手上部開口より継手内部に挿入して行って、高圧水によって切削された土砂を、継手上部開口方向に上昇して行く水の流れとともに、同水の流れを維持するために高圧ホースの先端付近から上向きに噴射した空気の上昇流に乗せて上部開口方向に上昇させて、同上部開口より外部に排出している（例えば、特許文献１参照）。   Conventionally, the earth and sand clogged inside the joint of steel pipe sheet piles inserted into the ground is injected by inserting the high-pressure hose into the joint from the top opening of the joint while jetting high-pressure water from the tip of the high-pressure hose. Along with the flow of water rising to the joint upper opening direction, the cut earth and sand are put on the upward flow of air jetted upward from the vicinity of the tip of the high-pressure hose to maintain the flow of the water in the upper opening direction. It is raised and discharged to the outside from the upper opening (see, for example, Patent Document 1).

しかしながら、この土砂の排出方法には以下のような問題があり、すなわち、継手内部に詰まっている土砂の切削能力を優先しようと高圧ホース先端の噴射口口径を小にすると、切削能力は大になるが高圧水の噴射水量が小になって継手上部開口方向に上昇して行く水の流れが弱くなり（排出能力の低下）、深いところの土砂を継手上部開口まで上昇させることができなくなって、途中まで上昇した土砂が再び継手下方に沈降する。   However, this soil and sand discharge method has the following problems, that is, if the injection port diameter at the tip of the high-pressure hose is made small in order to give priority to the cutting ability of earth and sand clogged inside the joint, the cutting ability is greatly increased. However, the amount of high-pressure water jet becomes small and the flow of water rising toward the joint upper opening becomes weak (decrease in discharge capacity), and it becomes impossible to raise the deep earth and sand to the joint upper opening. Then, the earth and sand that have risen up to the middle again settle down below the joint.

また、切削した土砂の排出能力を優先しようとする場合は、継手内部に大量の水を注入して継手上部開口方向に上昇して行く水の流れを強にしなければならないため高圧ホース先端の噴射口口径を大にするので、水の噴射圧が小になって土砂の切削能力が低下する。   In addition, when priority is given to the drainage capacity of the cut soil, a large amount of water must be injected into the joint to increase the flow of water that rises in the direction of the joint upper opening, so that the jet at the tip of the high-pressure hose Since the caliber is increased, the water injection pressure is reduced and the earth cutting ability is reduced.

したがって、従来の継手内部における土砂の排出方法は、上述のように土砂を排出する際の排出能力と切削能力が反比例するので、土砂の排出能力と切削能力を同時に向上させることができなかった。   Therefore, in the conventional method for discharging earth and sand inside the joint, the discharging ability and cutting ability when discharging earth and sand are inversely proportional as described above, and therefore the earth and sand discharging ability and cutting ability cannot be improved at the same time.

実公昭５８−４２４９６号公報（第１〜３頁、第１〜５図）Japanese Utility Model Publication No. 58-42496 (pages 1 to 3, FIGS. 1 to 5)

本発明は、継手内部における土砂の排出能力と切削能力を同時に向上できて、継手内部の土砂を短時間で排出できるようにして、土砂の排出を効率よく行える鋼管矢板の継手内部における土砂の排出方法を提供できるようにした。   The present invention is capable of simultaneously improving the sediment discharging ability and cutting ability inside the joint, enabling the sediment inside the joint to be discharged in a short time, and discharging the earth and sand inside the joint of the steel pipe sheet pile capable of efficiently discharging the sediment. Made it possible to provide a method.

上述した課題を解決するために、本発明に係る鋼管矢板の継手内部における土砂の排出方法は、地中に挿入した鋼管矢板の継手内部に詰まっている土砂を、同継手上部の開口より外部に排出するための排出方法であって、空気を供給する空気供給路と、同空気供給路内に配する高圧水を供給する高圧水供給路を備えてなる二重供給管を、同二重供給管の下方先端に備える前記高圧水供給路に接続する噴射ノズルより高圧水を少なくとも二重供給管の前進方向に噴射させながら同二重供給管を鋼管矢板の継手上部開口より同継手内部に挿入して行き、同高圧水により継手内部に詰まっている土砂を掘削して同土砂を水に含ませて同水とともに土砂を継手上部開口方向に流し、また必要に応じて、高圧水の噴射により水で充満する継手内部に二重供給管の前記ノズル上方近傍に備える前記空気供給路に接続する空気噴射口より空気を同二重供給管の挿入方向に空気を噴射し、同水中に生じる気泡の上昇力により同水とともに水中の土砂を継手上部開口方向に上昇させて同継手上部開口より外部に排出するものとしてある。   In order to solve the above-described problem, the method for discharging earth and sand inside the joint of the steel pipe sheet pile according to the present invention is to remove the earth and sand clogged inside the joint of the steel pipe sheet pile inserted into the ground from the opening of the upper part of the joint. A discharge method for discharging a dual supply pipe comprising an air supply path for supplying air and a high-pressure water supply path for supplying high-pressure water disposed in the air supply path. The double supply pipe is inserted into the joint through the joint upper opening of the steel pipe sheet pile while high pressure water is jetted at least in the forward direction of the double supply pipe from the injection nozzle connected to the high pressure water supply path provided at the lower end of the pipe. Then, excavate the sand clogged in the joint with the high pressure water, so that the sand is included in the water and flow the soil with the water in the direction of the upper opening of the joint, and if necessary, by jetting the high pressure water Double inside the fitting filled with water Air is injected in the insertion direction of the double supply pipe from an air injection port connected to the air supply path provided in the vicinity of the nozzle above the supply pipe. Sediment is raised in the joint upper opening direction and discharged to the outside through the joint upper opening.

また前記噴射ノズルの先端に掘削用ビットを設けるとともに二重供給管を回転させながら継手内部に挿入して行き、噴射ノズルより噴射している高圧水とともに掘削用ビットで継手内部の土砂を掘削するよう構成したものとしてある。   Further, a drilling bit is provided at the tip of the injection nozzle, and the double supply pipe is inserted into the joint while rotating, and the sediment inside the joint is excavated by the drilling bit together with the high-pressure water sprayed from the spray nozzle. The configuration is as follows.

また前記空気噴射口に逆止弁が設けられており、同弁は通常で閉となっていて空気が噴射された際に同噴射圧力によって開になるよう構成したものとしてある。   Further, a check valve is provided at the air injection port, and the valve is normally closed, and is configured to be opened by the injection pressure when air is injected.

また前記空気と高圧水の供給量を、継手上部の開口より外部に排出される土砂の排出状況に応じてそれぞれを独立制御するものとしてある。   The supply amounts of the air and the high-pressure water are independently controlled in accordance with the discharge state of earth and sand discharged to the outside from the opening at the upper part of the joint.

さらに前記二重供給管の少なくとも高圧水供給路が、超高圧に耐える素材で形成したものとしてある。   Furthermore, at least the high-pressure water supply path of the double supply pipe is formed of a material that can withstand ultra-high pressure.

本発明に係る鋼管矢板の継手内部における土砂の排出方法によれば、二重供給管の少なくとも高圧水供給路を超高圧に耐える素材で形成しているので、土砂切削用に供給する高圧水の圧力をさらに高めることができて超高圧水を供給できるため、したがって噴射口口径を大にしても土砂の切削能力が低下しないで土砂排出に重要な水の噴射水量を充分に確保できて、継手内部の土砂を短時間で大量に排出することができる。   According to the method for discharging sediment in the joint of steel pipe sheet piles according to the present invention, at least the high-pressure water supply path of the double supply pipe is formed of a material that can withstand ultra-high pressure. Since the pressure can be further increased and ultra-high pressure water can be supplied, even if the injection port diameter is increased, the cutting capacity of the earth and sand is not reduced, and a sufficient amount of water can be ensured to discharge the sediment. A large amount of internal sediment can be discharged in a short time.

さらに、二重供給管の空気供給路も高圧あるいは超高圧に耐える素材で形成すれば、切削した土砂を上昇させる空気の送気量や送気圧も高めることができ、したがって水で充満する継手内に噴射した空気の気泡は勢い良く継手上部開口方向に上昇して水とともに水中の土砂を継手上部開口方向にどんどん上昇させることもできるため、前述した超高圧水の噴射と併用すれば、継手内部の土砂をさらに短い時間で排出することもできる。   Furthermore, if the air supply path of the double supply pipe is made of a material that can withstand high pressure or ultra high pressure, the air supply rate and the air supply pressure for raising the cut earth and sand can be increased. The air bubbles injected into the joint can rise upward in the joint upper opening direction, and the soil in the water can be raised further along with the water in the joint upper opening direction. The earth and sand can be discharged in a shorter time.

以下、本発明に係る鋼管矢板の継手内部における土砂の排出方法を添付図面に基づいて説明する。   Hereinafter, a method for discharging earth and sand inside a joint of steel pipe sheet piles according to the present invention will be described with reference to the accompanying drawings.

図１は、地中１に挿入した鋼管矢板２の継手３内部に侵入している土砂４を、継手３の上部開口３ａから外部に排出している状態を示している。   FIG. 1 shows a state in which earth and sand 4 entering the inside of a joint 3 of a steel pipe sheet pile 2 inserted into the underground 1 is discharged to the outside from an upper opening 3 a of the joint 3.

鋼管矢板２の継手３内に侵入している土砂４の排出方法を説明すると、鋼材からなる二重供給管５に接続している高圧水供給管６、空気供給管７で外部の装置（図示は省略）から供給している高圧水、空気を、図２に示すように、二重供給管５に備える高圧水供給路８、空気供給路９を通過させて二重供給管５の先端に設けている噴射ノズルたる先端ノズル１０の高圧水噴射部１０ａ、空気噴射部１０ｂよりそれぞれを噴射している。   The method for discharging the earth and sand 4 entering the joint 3 of the steel pipe sheet pile 2 will be described. External devices (illustrated) include a high-pressure water supply pipe 6 and an air supply pipe 7 connected to a double supply pipe 5 made of steel. 2 is passed through the high pressure water supply path 8 and the air supply path 9 provided in the double supply pipe 5 to the tip of the double supply pipe 5 as shown in FIG. Each of the high-pressure water injection unit 10a and the air injection unit 10b of the tip nozzle 10, which is an injection nozzle, is injected.

そして、先端ノズル１０の高圧水噴射部１０ａにおける噴射口１１より噴射している高圧の水１６で継手３内の土砂４を掘削し、同掘削した土砂４を水１６中に含ませて継手３の上部開口３ａ方向への水１６の流れに乗せている。   And the earth and sand 4 in the joint 3 is excavated with the high-pressure water 16 injected from the injection port 11 in the high pressure water injection part 10a of the tip nozzle 10, and the excavated earth and sand 4 is included in the water 16 so that the joint 3 Is placed on the flow of water 16 in the direction of the upper opening 3a.

また継手３内に充満している水１６の中に、先端ノズル１０の空気噴射部１０ｂにおける噴射口１４より噴射している空気１７により気泡（空気１７）を生じさせ、同気泡（空気１７）の上昇力によって同水１６とともに水中の土砂４を上部開口３ａ方向へ大に上昇させて同上部開口３ａから外部に排出している。   Further, in the water 16 filled in the joint 3, air bubbles (air 17) are generated by the air 17 injected from the injection port 14 in the air injection portion 10b of the tip nozzle 10, and the bubbles (air 17). With the ascending force, the underwater earth and sand 4 is greatly raised in the direction of the upper opening 3a together with the water 16, and discharged from the upper opening 3a to the outside.

前記高圧水供給管６、空気供給管７で外部から供給している高圧水、空気の供給量は、鋼管矢板２を挿入している地盤に合わせて一定量を供給しているが、継手３の上部開口３ａより外部に排出される土砂４の排出状況に応じて、高圧水、空気の供給量を独立制御する場合もある。   The supply amount of high-pressure water and air supplied from the outside through the high-pressure water supply pipe 6 and the air supply pipe 7 is a constant amount according to the ground into which the steel pipe sheet pile 2 is inserted. Depending on the discharge state of the earth and sand 4 discharged to the outside from the upper opening 3a, the supply amount of high-pressure water and air may be controlled independently.

そして、二重供給管５の少なくとも高圧水供給路８を、例えば金属素材等の超高圧に耐える素材で形成しているので、高圧水供給管６から供給している高圧水の圧力をさらに高めて超高圧水を供給する場合もある。   Since at least the high-pressure water supply path 8 of the double supply pipe 5 is made of a material that can withstand ultra-high pressure, such as a metal material, the pressure of the high-pressure water supplied from the high-pressure water supply pipe 6 is further increased. In some cases, ultra-high pressure water is supplied.

また二重供給管５の空気供給路９も、前述の高圧水供給路８と同じように例えば金属素材等の超高圧に耐える素材で形成して、空気供給路９から供給している空気の圧力をさらに高めて高圧あるいは超高圧の空気を供給する場合もある。   Also, the air supply path 9 of the double supply pipe 5 is formed of a material that can withstand ultra-high pressure, such as a metal material, in the same manner as the high-pressure water supply path 8 described above, and the air supplied from the air supply path 9 In some cases, the pressure is further increased to supply high-pressure or ultrahigh-pressure air.

また、継手３の上部開口３ａに近い浅いところの土砂４を排出する場合は、前記空気１７を噴射しないで、土砂４を先端ノズル１０の高圧水噴射部１０ａにおける噴射口１１より噴射している水１６の流れに乗せて上部開口３ａまで上昇させ、同上部開口３ａから外部に排出させる場合もある。すなわち、土砂４を水１６の流水力だけで継手３の上部開口３ａまで上昇させて同上部開口３ａから外部に排出する。   Moreover, when discharging the shallow sand 4 close to the upper opening 3 a of the joint 3, the sand 4 is injected from the injection port 11 in the high-pressure water injection unit 10 a of the tip nozzle 10 without injecting the air 17. In some cases, the water 16 is raised to the upper opening 3a and discharged to the outside through the upper opening 3a. That is, the earth and sand 4 is lifted up to the upper opening 3a of the joint 3 only by the flow force of the water 16, and is discharged to the outside from the upper opening 3a.

上述のように、空気１７が先端ノズル１０の空気噴射部１０ｂから噴射されていない場合は、図３に示すように、先端ノズル１０の空気噴射部１０ｂに設けられている空気１７の噴射口１４を逆止弁１３によって閉じ、同噴射口１４から土砂４が流入しないようにしている。   As described above, when the air 17 is not jetted from the air jet section 10b of the tip nozzle 10, as shown in FIG. 3, the jet port 14 of the air 17 provided in the air jet section 10b of the tip nozzle 10 is used. Is closed by a check valve 13 so that the earth and sand 4 do not flow from the injection port 14.

そして、先端ノズル１０の空気噴射部１０ｂより空気１７を噴射させる場合は、図４に示すように、逆止弁１３の弁部材が備える復元力あるいは他部材で構成している復帰手段によって閉じられている噴射口１４を空気１７の噴射圧で強制的に押し開け、その開いた噴射口１４から空気１７を噴射している。   And when injecting the air 17 from the air injection part 10b of the front-end | tip nozzle 10, as shown in FIG. 4, it is closed by the restoring force with which the valve member of the non-return valve 13 is equipped, or the return means comprised by another member. The injection port 14 is forcibly pushed open by the injection pressure of the air 17, and the air 17 is injected from the opened injection port 14.

鋼管矢板２を挿入する地盤に硬質の層がある場合は、図５に示すように、高圧水噴射部１０ａに地盤を切削するための掘削用ビット１８を設けている先端ノズル１０を二重供給管５に装着するとともに同二重供給管５を管の軸方向に回転させながら継手３内に挿入して行き、先端ノズル１０の高圧水噴射部１０ａにおける噴射口１２から噴射している水１６とともに掘削用ビット１８で継手内部に侵入している硬質の土砂を掘削する場合もある。   When there is a hard layer on the ground into which the steel pipe sheet pile 2 is inserted, as shown in FIG. 5, the tip nozzle 10 provided with the excavation bit 18 for cutting the ground in the high-pressure water injection unit 10a is supplied twice. The water 16 which is attached to the pipe 5 and is inserted into the joint 3 while rotating the double supply pipe 5 in the axial direction of the pipe and jetted from the jet port 12 in the high-pressure water jet section 10a of the tip nozzle 10. At the same time, there is a case where hard earth and sand entering the inside of the joint is excavated by the excavating bit 18.

実施例における符号１５は、逆止弁１３を先端ノズル１０の空気噴射部１０ｂに固定するための固定部材、符号１９は、二重供給管５を吊り下げているクレーン（図示は省略）のワイヤである。   Reference numeral 15 in the embodiment is a fixing member for fixing the check valve 13 to the air injection portion 10b of the tip nozzle 10, and reference numeral 19 is a wire of a crane (not shown) that suspends the double supply pipe 5. It is.

本発明に係る土砂の排出方法により鋼管矢板の継手内部から土砂を排出している状態を示す施工図。The construction drawing which shows the state which is discharging the earth and sand from the inside of the joint of a steel pipe sheet pile by the earth and sand discharge method which concerns on this invention. 土砂の排出状態を示す継手の一部拡大断面図。The partial expanded sectional view of the joint which shows the discharge state of earth and sand. 先端ノズル部分を示す斜視図。The perspective view which shows a front-end nozzle part. 先端ノズル部分を示す斜視図。The perspective view which shows a front-end nozzle part. 先端ノズル部分を示す斜視図。The perspective view which shows a front-end nozzle part.

１ 地中
２ 鋼管矢板
３ 継手
３ａ 上部開口
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
１０ａ 高圧水噴射部
１０ｂ 空気噴射部
１１ 噴射口
１２ 噴射口
１３ 逆止弁
１４ 噴射口
１５ 固定部材
１６ 水
１７ 空気
１８ 切削用ビット
１９ ワイヤ DESCRIPTION OF SYMBOLS 1 Underground 2 Steel pipe sheet pile 3 Joint 3a Upper opening 4 Earth and sand 5 Double supply pipe 6 High pressure water supply pipe 7 Air supply pipe 8 High pressure water supply path 9 Air supply path 10 Tip nozzle 10a High pressure water injection part 10b Air injection part 11 Injection Port 12 Injection port 13 Check valve 14 Injection port 15 Fixing member 16 Water 17 Air 18 Cutting bit 19 Wire

Claims (2)

地中に挿入した鋼管矢板の継手内部に詰まっている土砂を、該継手上部の開口より外部へ排出するための排出方法であって、
高圧に耐える鋼材で形成され高圧の空気を供給する空気供給路と、この空気供給路の内周側に位置し高圧に耐える鋼材で形成され高圧水を供給する高圧水供給路と、からなる二重供給管を、この二重供給管の下方先端に装着されている噴射ノズルとともに鋼管矢板の継手内部に挿入して前進させるステップと、
上記高圧水供給路に接続されている上記噴射ノズルの高圧水噴射口より、二重供給管の前進方向へ高圧水を噴射させるとともに、上記空気供給路に接続されている上記噴射ノズルの空気噴射口より、二重供給管の前進方向へ空気を噴射させるステップと、
上記噴射ノズルから空気に同伴されながら噴射される高圧水で、上記鋼管矢板の継手内部に詰まっている土砂を掘削するステップであって、切削用ビット付きの先端ノズルを上記二重供給管に装着して、上記二重供給管を軸回転させながら継手内部へ挿入していき、上記先端ノズルの高圧水噴射口から噴射している高圧水とともに上記掘削用ビットで継手内部の硬質の土砂を掘削することを含む、掘削するステップと、
上記噴射された水と上記掘削された土砂とが混合した泥水を、上記噴射された空気によって該泥水中に生じる気泡の上昇力を利用して上記鋼管矢板の継手上部の開口方向へ上昇させるステップと、
上記二重供給管が上記鋼管矢板の継手上部開口よりも高い位置まで延在する状態で、上記鋼管矢板の継手上部の開口より上記泥水を排出させるステップと、
を含み、
上記噴射ノズルの上側かつ上記空気供給路の外周側の壁に逆止弁を備えていて、この逆止弁は、通常は閉じているが、上記空気供給路に空気が流れるとき、この空気から圧力を受けて外周側上方へ向けて該空気を噴射させるように開く逆止弁であることを特徴とする鋼管矢板の継手内部における土砂の排出方法。 A discharging method for discharging earth and sand clogged inside a joint of a steel pipe sheet pile inserted into the ground to the outside through an opening at the top of the joint,
An air supply path that is formed of a steel material that can withstand high pressure and supplies high-pressure air; and a high-pressure water supply path that is located on the inner periphery of the air supply path and that is formed of a steel material that can withstand high pressure and supplies high-pressure water. Inserting the heavy supply pipe into the joint of the steel pipe sheet pile together with the injection nozzle attached to the lower end of the double supply pipe, and advancing;
High-pressure water is jetted in the forward direction of the double supply pipe from the high-pressure water jet port of the jet nozzle connected to the high-pressure water supply path, and the air jet of the jet nozzle connected to the air supply path Jetting air in the forward direction of the double supply pipe from the mouth;
A step of excavating earth and sand clogged inside the joint of the steel pipe sheet pile with high-pressure water jetted while being accompanied by air from the jet nozzle, and attaching a tip nozzle with a cutting bit to the double supply pipe Then, the double supply pipe is inserted into the joint while rotating the shaft, and the hard earth and sand inside the joint is excavated by the excavation bit together with the high-pressure water sprayed from the high-pressure water jet of the tip nozzle. Drilling, including, and
The step of raising the muddy water in which the jetted water and the excavated earth and sand are mixed in the opening direction of the upper part of the joint of the steel pipe sheet pile using the rising force of bubbles generated in the mud by the jetted air. When,
In a state where the double supply pipe extends to a position higher than the joint upper opening of the steel pipe sheet pile, the step of discharging the muddy water from the opening of the joint upper part of the steel pipe sheet pile;
Including
A check valve is provided on the wall on the upper side of the injection nozzle and on the outer peripheral side of the air supply path. The check valve is normally closed, but when air flows through the air supply path, A method for discharging earth and sand inside a joint of a steel pipe sheet pile, wherein the check valve opens so as to inject the air toward the upper side of the outer periphery under pressure. 上記空気の供給量と上記高圧水の供給量は、上記鋼管矢板の継手上部の開口から外部へ排出される土砂の排出状況に応じて独立制御されることを特徴とする請求項１に記載の鋼管矢板の継手内部における土砂の排出方法。 The supply amount of the supply amount and the high-pressure water of the air, according to claim 1, characterized in that the independent control in accordance with the discharge conditions of sediment is discharged to the outside from the opening of the joint upper part of the steel pipe sheet piles A method for discharging earth and sand inside the joints of steel pipe sheet piles.
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