JP2014185426A - Press-in method of steel pipes, and pipes - Google Patents

Press-in method of steel pipes, and pipes Download PDF

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JP2014185426A
JP2014185426A JP2013059168A JP2013059168A JP2014185426A JP 2014185426 A JP2014185426 A JP 2014185426A JP 2013059168 A JP2013059168 A JP 2013059168A JP 2013059168 A JP2013059168 A JP 2013059168A JP 2014185426 A JP2014185426 A JP 2014185426A
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steel pipe
sheet pile
press
pipe sheet
fitting
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JP6319942B2 (en
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Hirosuke Yokoyama
弘介 横山
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YOKOYAMA KISO KOJI KK
Yokoyama Kiso Kohji Co Ltd
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YOKOYAMA KISO KOJI KK
Yokoyama Kiso Kohji Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe press-in method capable of maximally exhibiting the combination use effect of a press-in device and a center digging device, by reliably pressing in a steel pipe up to a target depth with low vibration and low noise.SOLUTION: For example, when pressing in a steel pipe sheet pile by combinationally using center digging in steel pipe sheet pile installation work, a process of pressing in the steel pipe sheet pile and a process of excavating by inserting the center digging device into a steel pipe sheet pile main pipe, are simultaneously advanced in parallel, and water to be pressurized by water head pressure is injected into the steel pipe sheet pile main pipe at a proper timing. After injecting the water into the main pipe up to the generation of a water head difference between the steel pipe outside and itself, press-in and the center digging of the steel pipe sheet pile are continued under the situation of the main pipe filled with the water, and the steel pipe sheet pile is occasionally moved up and down to in its process. Pressure (water head pressure) of the water injected into the steel pipe sheet pile main pipe, propagates along the inside and the outer periphery under the main pipe, and further propagates to an inner space part of a joint part. This propagation pressure influences sediment becoming the cause of clogging in the joint part, and acts in the direction for upwardly pushing out the sediment, and largely contributes to eliminating the clogging.

Description

本発明は、鋼管矢板、鋼管杭、ケーシングパイプ、ケーシングチューブなどの鋼管類を地盤に圧入するための方法に関するものである。また、この圧入方法において鋼管類に接続して用いられるパイプ類に関するものである。   The present invention relates to a method for press-fitting steel pipes such as a steel pipe sheet pile, a steel pipe pile, a casing pipe, and a casing tube into the ground. Further, the present invention relates to pipes used by being connected to steel pipes in this press-fitting method.

鋼管類の一種である鋼管矢板は、本体をなす本管を有するとともに、その両脇長手方向に沿って固設された一対の継手を具備している。例えばこのような鋼管矢板を用いて鋼管矢板壁を構築するには、先行打設された鋼管矢板の継手部と後行打設される鋼管矢板の継手部とをスライド係合させつつ、地盤に後行の鋼管矢板を圧入する。その際、図13に示すような鋼管矢板圧入装置(パイラー)が施工現場で一般的に用いられる。この圧入装置は、打撃力に頼ることなく鋼管矢板を静的に圧入するので、特に低振動・低騒音が求められる施工現場で広く採用されている。   A steel pipe sheet pile, which is a type of steel pipe, has a main pipe that forms a main body, and includes a pair of joints fixed along the longitudinal direction on both sides thereof. For example, in order to construct a steel pipe sheet pile wall using such a steel pipe sheet pile, the joint portion of the steel pipe sheet pile previously placed and the joint portion of the steel pipe sheet pile placed subsequent are slidably engaged with the ground. Press the steel pipe sheet pile of the following. At that time, a steel pipe sheet pile press-in device (pyler) as shown in FIG. 13 is generally used at the construction site. This press-fitting device statically presses the steel pipe sheet pile without depending on the striking force, and is therefore widely used especially in construction sites where low vibration and low noise are required.

一方、鋼管矢板の圧入の際には、本管内や下端地盤において砂や礫などに圧密が生じ、それが大きな貫入抵抗となって鋼管矢板の圧入を妨げることが、本願出願人によって指摘されている。そこで、圧入時の貫入抵抗を低減する手段として、図13に示すような中掘り装置を併用し、圧入装置による鋼管矢板の圧入と同時並行で本管内を中掘り掘削することが、本願出願人によって提案されている。   On the other hand, when the steel pipe sheet pile is press-fitted, it is pointed out by the applicant of the present invention that sand or gravel is generated in the main pipe or at the lower end ground, which becomes a large penetration resistance and hinders the press fitting of the steel pipe sheet pile. Yes. Therefore, as a means for reducing the penetration resistance at the time of press-fitting, it is possible to jointly dig and excavate the inside of the main pipe in parallel with the press-fitting of the steel pipe sheet pile by the press-fitting device as shown in FIG. Has been proposed by.

具体的には図13に示すように、既設鋼管矢板に反力をとった圧入装置で新設鋼管矢板を把持して圧入する。それと同時並行で、クレーンで吊り下げた中掘り装置を本管内に挿入し、その内側を中掘り掘削して、適当なタイミングで掘削土を管外へ排土する。中掘り装置は、先端に掘削ビットを具備するオーガースクリューと、該オーガースクリューを囲繞するカプセルパイプと、該オーガースクリューを回転駆動するための駆動装置を有している。中掘りで生じた掘削土はカプセルパイプ内に一時的に格納され、適当なタイミングで中掘り装置を本管の外側へ吊り上げて管外で排土するようになっている。   Specifically, as shown in FIG. 13, a new steel pipe sheet pile is gripped and press-fitted by a press-fitting device that takes a reaction force on the existing steel pipe sheet pile. At the same time, the digging device suspended by a crane is inserted into the main pipe, the inside is dug up, and the excavated soil is discharged outside the pipe at an appropriate timing. The medium digging device has an auger screw having a drill bit at the tip, a capsule pipe surrounding the auger screw, and a drive device for rotationally driving the auger screw. The excavated soil generated by the medium digging is temporarily stored in the capsule pipe, and the medium digging device is lifted to the outside of the main pipe and discharged outside the pipe at an appropriate timing.

(鋼管矢板の継手部の目詰まりに関する問題)
継手部を具備する鋼管矢板を打設するにあたって、圧入の妨げとなる砂や礫の圧密は、本管内や下端地盤の圧密ばかりでなく、図14に示すように継手部においても発生する。すなわち、鋼管矢板の打設時には、圧入に伴って、連結用の継手部の下開口部やスリットから、該継手部内に細砂や礫などが必然的に混入する。それが鋼管矢板圧入の際の単調な昇降(上下)運動の反復により累積し、細砂や礫が継手部内の狭隘な内空部で圧密し、やがて継手部内に目詰まりを招く。
(Problems related to clogging of steel pipe sheet pile joints)
In placing a steel pipe sheet pile having a joint portion, sand and gravel consolidation, which hinders press-fitting, occurs not only in the main pipe and the bottom ground, but also in the joint portion as shown in FIG. That is, when the steel pipe sheet pile is placed, fine sand, gravel, and the like are inevitably mixed into the joint from the lower opening and slit of the joint for connection. It accumulates by repeated monotonous up-and-down (up and down) movements during the press-fitting of steel pipe sheet piles, and fine sand and gravel are consolidated in a narrow inner space within the joint, eventually leading to clogging within the joint.

このような、鋼管矢板継手部における目詰まりは、貫入抵抗増大の要因となって、該鋼管矢板の圧入を妨げ、その打設及び連結を困難にする。ところが、かかる継手部内の目詰まり解消に係る課題は未だ解決しておらず、上述した圧入装置と中掘り装置を併用する場合でも施工途中で貫入不能となるといった事例が後を絶たない。なお、鋼管矢板継手部の形状(断面形状)としては、例えば図15の平面図に示すような「P−P型」「P−T型」「L−T型」などが一般的に知られているが、いずれのタイプの継手部においても、上述した継手部における目詰まりの問題が不可避的に生じていた。   Such clogging in the steel pipe sheet pile joint portion causes an increase in penetration resistance, hinders the press fitting of the steel pipe sheet pile, and makes it difficult to place and connect the steel sheet pile sheet. However, the problem related to the clogging elimination in the joint portion has not been solved yet, and there is no end to the case where the penetration cannot be performed during the construction even when the above-described press-fitting device and the digging device are used together. In addition, as a shape (cross-sectional shape) of a steel pipe sheet pile joint part, for example, “PP type”, “PT type”, “LT type” and the like as shown in the plan view of FIG. 15 are generally known. However, in any type of joint part, the above-described problem of clogging in the joint part inevitably occurred.

上述したように鋼管矢板が貫入不能状態に陥った場合、従来では、バイブロハンマーなどを用いて打撃力により強制的に目標深度まで打設していた。しかしながら、低振動・低騒音が求められる施工現場で打撃力に頼ることは、施工条件に反することは勿論のこと、振動と騒音が既設構造物や周辺環境に悪影響を及ぼすため、打撃力に頼ることなく鋼管矢板を低振動・低騒音で確実に打設できる新たな手法が強く望まれていた。特に、数十メートルにも及ぶ深い根入れが求められる近年の鋼管矢板打設工では、圧入の進行に伴う貫入抵抗の増大が著しく、圧入装置への負担が過大となっているため、鋼管矢板打設時の貫入抵抗の緩和が緊急課題となっている。   As described above, when the steel pipe sheet pile is in a state where it cannot penetrate, conventionally, the steel sheet pile has been forcibly driven to the target depth by a striking force using a vibro hammer or the like. However, relying on striking force at construction sites where low vibration and low noise are required is not only contrary to construction conditions, but also because vibration and noise adversely affect existing structures and the surrounding environment. There has been a strong demand for a new method that can reliably place steel sheet piles with low vibration and noise. In particular, in recent steel pipe sheet pile placing work that requires deep penetration of several tens of meters, the increase in penetration resistance with the progress of press-fitting is remarkable, and the burden on the press-fitting equipment is excessive, so the steel pipe sheet pile is excessive. Mitigation of penetration resistance at the time of placement is an urgent issue.

(中掘り装置を本管から引き抜く際の問題)
上述したように、鋼管矢板圧入時の貫入抵抗を軽減する目的で、図13に示すように圧入装置と中掘り装置を併用することが、本願出願人によって提案されている。
(Problems when pulling out the medium digging device from the main)
As described above, the applicant of the present application has proposed that the press-fitting device and the digging device be used together as shown in FIG. 13 for the purpose of reducing the penetration resistance during the press-fitting of the steel pipe sheet pile.

しかしながら、このように中掘り装置を併用する場合において、掘削土を容量いっぱいに格納した中掘り装置を本管から引き抜く際に、その引き抜き動作によって吸引作用が生じる。(本管が「シリンダ」、中掘り装置が「ピストン」の関係となって、中掘り装置を引き抜く際に吸い上げ作用を招く。)   However, in the case of using the digging device together in this way, when the digging device storing the excavated soil to the full capacity is pulled out from the main pipe, a suction action is generated by the pulling operation. (The main pipe is a “cylinder” and the digging device is a “piston”, which causes a sucking action when the digging device is pulled out.)

そのため図16に示すように、管外へ排土するために中掘り装置を引き抜く際に、吸引作用の影響で、鋼管矢板本管内に地下水や土砂を引き込んでしまい、その結果、鋼管矢板周囲の土砂が鋼管締め付け方向に流動して、鋼管矢板を外周からクサビ状に締め付ける作用を誘発し、圧入しようとする鋼管矢板を周囲からロックする事態を招いていた。   Therefore, as shown in FIG. 16, when pulling out the digging device to discharge the outside of the pipe, the groundwater and earth and sand are drawn into the steel pipe sheet pile main pipe due to the influence of the suction action. The earth and sand flowed in the direction of tightening the steel pipe, inducing the action of tightening the steel pipe sheet pile from the outer periphery, causing a situation where the steel pipe sheet pile to be press-fitted was locked from the surroundings.

このように従来の打設方法では、貫入抵抗緩和目的で導入された中掘り装置が、逆に貫入抵抗を増大する要因を招く虞があったため、圧入と中掘りの併用の効果を最大限に発揮できない場合があった。   As described above, in the conventional placing method, the digging device introduced for the purpose of reducing the penetration resistance may cause a factor to increase the penetration resistance, so that the effect of the combined use of the press fitting and the digging is maximized. There were cases where it could not be demonstrated.

(本発明の目的)
そこで、上述した問題点に鑑み、本発明の目的は、鋼管類を、打撃力に頼ることなく低振動・低騒音で確実に目標深度まで圧入でき、圧入装置と中掘り装置の併用の効果を最大限に発揮できる鋼管類圧入方法とこの方法の実施を補助する補助機材(パイプ類)を提供することにある。
(Object of the present invention)
Therefore, in view of the above-described problems, the object of the present invention is to reliably press-fit steel pipes to a target depth with low vibration and low noise without depending on the striking force, and to achieve the effect of combined use of the press-fitting device and the digging device. The purpose is to provide a method for press-fitting steel pipes that can be maximized, and auxiliary equipment (pipes) that assists the implementation of this method.

上記目的は、鋼管類の中掘りを併用して該鋼管類を圧入する方法において、水頭圧により加圧するための液体を鋼管類内に注入することによって達成される。具体的には、鋼管類の中掘りを併用して該鋼管類を地盤に圧入する方法において、「鋼管類を圧入する工程」と、「前記鋼管類内に中掘り装置を挿入して掘削する工程」とを同時並行的に実施し、併せて適当なタイミングで、水頭圧により加圧するための液体(例えば水)を前記鋼管類内に注入するようにする。   The above object is achieved by injecting a liquid for pressurization by hydraulic head pressure into the steel pipes in a method for press-fitting the steel pipes together with the excavation of the steel pipes. Specifically, in the method of press-fitting the steel pipes into the ground in combination with the excavation of the steel pipes, “the step of press-fitting the steel pipes” and “the excavation by inserting the digging device into the steel pipes The “process” is carried out simultaneously, and at the same time, a liquid (for example, water) for pressurization by the hydraulic head pressure is injected into the steel pipes at an appropriate timing.

好ましくは、前記液体が鋼管類内に注入された状況下で該鋼管類を圧入し、その圧入過程で時おり該鋼管類を昇降動させるのがよい。   Preferably, the steel pipes are press-fitted under the condition where the liquid is injected into the steel pipes, and the steel pipes are sometimes moved up and down during the press-fitting process.

また好ましくは、鋼管類外部との間に水頭差が生じるように前記液体を鋼管類内に注入するのがよい。   Preferably, the liquid is injected into the steel pipes so that a water head difference is generated between the steel pipes and the outside.

液体注入のタイミングとしては、例えば、前記鋼管類の貫入抵抗が許容レベルを上回ったと判断したときに、前記液体を鋼管類内に注入するのがよい。   As the timing of liquid injection, for example, when it is determined that the penetration resistance of the steel pipes exceeds an allowable level, the liquid may be injected into the steel pipes.

そして、鋼管類の圧入が最終段階に差し掛かったら(すなわち残りの圧入量が少なくなってきたら)、水頭差を確保するためのパイプ類を前記鋼管類の頭部に継ぎ足すようにしてもよい。このパイプ類は、貯液空間を確保する目的で鋼管類頭部に継ぎ足して用いられ、鋼管類の継ぎ足したときの姿勢を維持するための姿勢保持手段を具備することが好ましい。   Then, when the steel pipes are pressed into the final stage (that is, when the remaining press-fitting amount decreases), pipes for securing a head difference may be added to the heads of the steel pipes. These pipes are used by adding to the head of the steel pipe for the purpose of securing a liquid storage space, and are preferably provided with a posture holding means for maintaining the posture when the steel pipe is added.

なお、このような鋼管類の具体例としては、例えば、鋼管矢板、鋼管杭、ケーシングパイプ、ケーシングチューブなどが挙げられる。   In addition, as a specific example of such steel pipes, a steel pipe sheet pile, a steel pipe pile, a casing pipe, a casing tube, etc. are mentioned, for example.

本発明では、例えば圧入と中掘りを併用して鋼管矢板を打設する際に、鋼管矢板の本管内に加圧用の液体(代表例として水)を注入するようになっている。本管内に注入された液体の圧力(水頭圧)は、本管下方の内側および外壁面に沿って伝搬し、更には継手部の内空部へと伝搬する。この伝搬圧力が、継手部内で目詰まりの原因となっている土砂に影響して、この土砂を上方へ押し出す方向に作用し、目詰まり解消に大きく貢献する。したがって本発明によれば、継手部に目詰まりが生じやすい施工現場であっても、目詰まりを解消して貫入抵抗を緩和できるので、打撃力に頼ることなく、鋼管矢板を低振動・低騒音で確実に打設できるようになる。   In the present invention, for example, when a steel pipe sheet pile is driven using both press-fitting and digging, a pressurizing liquid (water as a representative example) is injected into the main pipe of the steel pipe sheet pile. The pressure of the liquid injected into the main pipe (water head pressure) propagates along the inner and outer wall surfaces below the main pipe and further propagates into the inner space of the joint. This propagation pressure affects the earth and sand causing clogging in the joint portion, acts in the direction of pushing the earth and sand upward, and greatly contributes to eliminating clogging. Therefore, according to the present invention, even at a construction site where the clogging of the joint portion is likely to occur, the clogging can be eliminated and the penetration resistance can be reduced. Therefore, the steel sheet pile can be reduced in vibration and noise without depending on the striking force. It will be possible to place it reliably.

また本発明では、液体が鋼管矢板本管に注入された状況下で、該鋼管矢板を圧入しつつ、時おり昇降(鋼管矢板の上下動)を繰り返すようになっている。このように、継手部内の目詰まり箇所に水頭圧が作用する状況下で、鋼管矢板の昇降を繰り返すことで、目詰まり箇所を徐々にほぐすとともに流動を促すので、鋼管矢板継手部の目詰まりをより確実に解消することが可能になる。   Moreover, in this invention, under the condition where the liquid was inject | poured into the steel pipe sheet pile main pipe, raising / lowering (up-and-down movement of a steel pipe sheet pile) is repeated while pressing the steel pipe sheet pile. In this way, by repeatedly raising and lowering the steel pipe sheet pile under the situation where the hydraulic head pressure acts on the clogged part in the joint part, the clogged part is gradually loosened and the flow is promoted, so the steel pipe sheet pile joint part is clogged. This can be solved more reliably.

また本発明によれば、加圧用液体を本管内に注入することで、鋼管矢板の下方や周囲に継続して水頭圧を作用させることができるので、中掘り装置の引き抜きに伴う吸い上げ作用を相殺または軽減できる。したがって、中掘り装置の引き抜き時における締め付け作用(吸引作用)を抑制または緩和し、圧入と中掘りの併用のメリットを最大限に発揮させることが可能になる。   Further, according to the present invention, by injecting the pressurizing liquid into the main pipe, it is possible to continuously apply the hydraulic head pressure below and around the steel pipe sheet pile, so that the sucking action accompanying the withdrawal of the digging device is offset. Or it can be reduced. Therefore, it is possible to suppress or alleviate the tightening action (suction action) at the time of pulling out the inside digging device, and to maximize the merit of the combined use of press fitting and inside digging.

また本発明では、必ずしも常に本管内に加圧用液体を貯留している必要はなく、鋼管矢板の貫入抵抗が所定の許容レベルを上回ったと判断したときに、加圧用液体を本管内に注入してもよい。これにより、不必要な注液を避けて省力での施工が可能になる。   In the present invention, it is not always necessary to store the pressurizing liquid in the main pipe. When it is determined that the penetration resistance of the steel pipe sheet pile exceeds a predetermined allowable level, the pressurizing liquid is injected into the main pipe. Also good. As a result, it is possible to avoid unnecessary injection and save labor.

また本発明では、鋼管矢板の圧入が進み、打設残量が少なくなってきたら、該鋼管矢板本管の頭部にヤットコなどのパイプ類を継ぎ足すようになっている。これにより、鋼管矢板1本の打設が終盤に差し掛かり、圧入長さが残り僅かとなって、鋼管矢板の残部だけでは水頭差を確保できなくなっても、その頭部にパイプ類を延設することで注水空間(必要な水頭圧を作り出すための貯液空間)の嵩が増し、必要量の水頭差を確保できる。なお、延設されたパイプ類は、鋼管矢板の打設完了後に取り外されるので、施工後に鋼管矢板の機能を阻害することはない。   Further, in the present invention, when the steel pipe sheet pile has been press-fitted and the remaining amount of casting has been reduced, pipes such as Yatsuko are added to the head of the steel pipe sheet pile main pipe. As a result, even if one steel pipe sheet pile is placed in the final stage, the press-fit length becomes small, and even if it becomes impossible to secure a water head difference only by the remaining part of the steel pipe sheet pile, pipes are extended to the head. This increases the volume of the water injection space (the liquid storage space for creating the required head pressure), and ensures the required amount of head difference. In addition, since the extended pipes are removed after completion of the placement of the steel pipe sheet pile, the function of the steel pipe sheet pile is not hindered after construction.

なお、上述した効果の説明では、鋼管類の一例として鋼管矢板を挙げたが、本発明において鋼管類の種類はこれに限定されず、例えば、鋼管杭の打設やケーシングチューブの圧入にも本発明を適用し、同様の効果を得ることができる。   In the above description of the effect, the steel pipe sheet pile is given as an example of the steel pipe, but the type of the steel pipe is not limited to this in the present invention. The same effect can be obtained by applying the invention.

本発明の実施に用いる機材構成の概略を示す図である。It is a figure which shows the outline of the equipment structure used for implementation of this invention. 図1に示す鋼管矢板圧入装置及びその周囲を示す拡大図である。It is an enlarged view which shows the steel pipe sheet pile press-fit apparatus shown in FIG. 1, and its periphery. 本発明で利用可能な中掘り装置の具体的構成を例示する図である。It is a figure which illustrates the specific structure of the digging apparatus which can be used by this invention. 鋼管矢板の打設途中で鋼管矢板本管内に注水する様子を示す図である。It is a figure which shows a mode that water is poured in the steel pipe sheet pile main pipe | tube in the middle of placement of a steel pipe sheet pile. 鋼管矢板本管内に注水して、外部との水頭差を必要量確保している様子を示す図である。It is a figure which shows a mode that water is poured in the steel pipe sheet pile main pipe | tube, and the required amount of water head differences with the exterior is ensured. 鋼管矢板本管内への注水と同時並行で、鋼管矢板本管の内側を中掘りしている様子を示す図である。It is a figure which shows a mode that the inner side of the steel pipe sheet pile main pipe is dug in parallel with the water injection into the steel pipe sheet pile main pipe. 中掘り装置で鋼管矢板本管の下端付近まで掘りきったときに、水頭圧を受けた水が本管下端から継手方向へ一気に逃げ始める様子を示す拡大図である。It is an enlarged view which shows a mode that the water which received the hydraulic head pressure begins to escape at a stretch from the lower end of a main pipe to a joint direction when it digs up to the lower end vicinity of a steel pipe sheet pile main pipe with a medium digging apparatus. 目詰まりを生じていた継手部の内側が、鋼管矢板の上下動や水頭圧の作用を受け、一気にフラッシングされている様子を示す図である。It is a figure which shows a mode that the inner side of the coupling | joint part which has produced clogging receives the effect | action of the up-and-down movement of a steel pipe sheet pile, or a hydraulic head pressure, and is flushed at a stretch. 中掘り装置を引く抜く際のピストン動作に伴う「吸い上げ作用」を水頭圧で抑制している様子を示す図である。It is a figure which shows a mode that the "sucking effect | action" accompanying piston operation | movement at the time of pulling out an inside digging apparatus is suppressed with the hydraulic head pressure. 鋼管矢板の打設の終盤において、鋼管矢板本管の頭部にパイプ類を継ぎ足して、必要量の水頭差を確保している様子を示す図である。It is a figure which shows a mode that the pipe head is added to the head of the steel pipe sheet pile main pipe, and the required amount of water head difference is ensured in the final stage of the placement of the steel pipe sheet pile. 鋼管矢板の圧入の進行に伴う貫入抵抗変化の推移の概要を示すイメージ図である。It is an image figure which shows the outline | summary of transition of the penetration resistance change accompanying the progress of press injection of a steel pipe sheet pile. 鋼管矢板頭部に接続するパイプ類の好適実施例を示す図である。It is a figure which shows the suitable Example of the pipes connected to a steel pipe sheet pile head. 鋼管矢板圧入装置と中掘り装置を併用した鋼管矢板打設工の様子を示す図である。It is a figure which shows the mode of the steel pipe sheet pile driving construction which used the steel pipe sheet pile press-in apparatus and the digging apparatus together. 鋼管矢板打設工で生じる継手部内の目詰まり(継手部内で圧密した土砂)の様子を示す図である。It is a figure which shows the mode of the clogging (the earth and sand consolidated in the joint part) in the joint part which arises in a steel pipe sheet pile driving construction. 鋼管矢板の継手部のバリエーションを示す図である。It is a figure which shows the variation of the coupling part of a steel pipe sheet pile. 中掘り装置を引く抜く際における「吸い上げ作用」によって、周囲の土砂が鋼管矢板をクサビ状に締め付けてロックする様子を示す図である。It is a figure which shows a mode that the surrounding earth and sand fastens and locks a steel pipe sheet pile in a wedge shape by "sucking action" at the time of pulling out an inside digging apparatus.

以下、鋼管類の代表例として鋼管矢板を挙げて本発明の実施形態について説明する。   Hereinafter, a steel pipe sheet pile will be cited as a representative example of steel pipes, and embodiments of the present invention will be described.

本発明を実施する際には、例えば図1に示すように、鋼管矢板5を対象地盤に圧入するための圧入装置3と、該鋼管矢板本管の内側を中掘りするための中掘り装置8を用いる。
はじめに、これらの主要機材の具体的構成について説明する。
In carrying out the present invention, for example, as shown in FIG. 1, a press-fitting device 3 for press-fitting a steel pipe sheet pile 5 into a target ground, and an intermediate digging device 8 for digging the inside of the steel pipe sheet pile main pipe. Is used.
First, the specific configuration of these major equipment will be described.

(鋼管矢板圧入装置)
図2に基づいて、鋼管矢板圧入装置3の具体的構成について説明する。
(Steel sheet pile press-in device)
Based on FIG. 2, the concrete structure of the steel pipe sheet pile press-in apparatus 3 is demonstrated.

圧入装置3は、一般的に「パイラー」と称されるタイプの圧入機であり、本発明に適用可能な圧入装置の一例である。この圧入装置3は、本体31と、既設杭把持部33と、スライドベース35と、昇降体37と、油圧シリンダ39を有している。   The press-fitting device 3 is a press-fitting machine of a type generally called “pyler”, and is an example of a press-fitting device applicable to the present invention. The press-fitting device 3 includes a main body 31, an existing pile gripping portion 33, a slide base 35, an elevating body 37, and a hydraulic cylinder 39.

台座をなす既設杭把持部33の下部には、既設鋼管矢板の本管51’を着脱自在に把持するクランプ34,34が設けられている。各クランプは既設鋼管矢板の本管51’内に挿入され、押し開くように該本管の内壁に圧着して、既設鋼管矢板5’を把持する。圧入装置のクランプ34が既設鋼管矢板5’を把持することで、次打設の鋼管矢板圧入用の反力が該既設鋼管矢板に確保される。   Clamps 34 and 34 for detachably holding the main pipe 51 ′ of the existing steel pipe sheet pile are provided at the lower part of the existing pile holding part 33 that forms the base. Each clamp is inserted into the main pipe 51 'of the existing steel pipe sheet pile, and is crimped to the inner wall of the main pipe so as to push open, thereby holding the existing steel pipe sheet pile 5'. As the clamp 34 of the press-fitting device grips the existing steel pipe sheet pile 5 ', a reaction force for press-fitting the next steel pipe sheet pile is ensured in the existing steel pipe sheet pile.

既設杭把持部33の上部には、該既設杭把持部に対してスライド自在のスライドベース35が設けられている。このスライドベースの上に本体31が設けられている。   A slide base 35 that is slidable with respect to the existing pile holding portion is provided on the upper portion of the existing pile holding portion 33. A main body 31 is provided on the slide base.

昇降体37は、本体31の前方で昇降自在に装着されている。この昇降体37は、その上部に設けた油圧シリンダ39によって上下駆動されて昇降する。昇降体37の下部には、圧入すべき鋼管矢板5を外周側から把持できる平面視略リング状のチャック38が固設されている。   The elevating body 37 is mounted so as to be movable up and down in front of the main body 31. The elevating body 37 moves up and down by being driven up and down by a hydraulic cylinder 39 provided at an upper portion thereof. A substantially ring-shaped chuck 38 in plan view that can grip the steel pipe sheet pile 5 to be press-fitted from the outer peripheral side is fixed to the lower part of the elevating body 37.

鋼管矢板を圧入する際には、リング状チャック38に鋼管矢板5を通した状態で、該鋼管矢板を外周側から把持する。その際、鋼管矢板の断面略C字状の継手部52が、既設鋼管矢板の継手部53’にスライド係合して両継手部が連結するように、鋼管矢板5を位置合わせする。続いて、油圧シリンダ39を駆動して、鋼管矢板5を把持した状態のチャック38を降下させ、該鋼管矢板に圧入力を付与する。   When the steel pipe sheet pile is press-fitted, the steel pipe sheet pile is gripped from the outer peripheral side while the steel pipe sheet pile 5 is passed through the ring-shaped chuck 38. At that time, the steel pipe sheet pile 5 is aligned so that the joint portion 52 having a substantially C-shaped cross section of the steel pipe sheet pile slides and engages with the joint portion 53 ′ of the existing steel pipe sheet pile. Subsequently, the hydraulic cylinder 39 is driven to lower the chuck 38 in a state where the steel pipe sheet pile 5 is gripped, and pressure input is applied to the steel pipe sheet pile.

油圧シリンダ39のストロークいっぱいまで鋼管矢板5を圧入したら、チャック38による把持をいったん解除して鋼管矢板5を解放し、次いで昇降体37を前記ストローク分だけ上昇させ、再び前記同様の一連の操作(鋼管把持→降下圧入→把持解除→昇降体上昇)を繰り返して所定の深度まで圧入を試みる。また、この圧入の過程では、貫入抵抗緩和と継手部の目詰まり解消などを目的として、時おり鋼管矢板を所定ストロークで上下動させる。   When the steel pipe sheet pile 5 is press-fitted to the full stroke of the hydraulic cylinder 39, the gripping by the chuck 38 is once released to release the steel pipe sheet pile 5, and then the lifting body 37 is raised by the stroke, and the same series of operations ( Repeat the process of steel pipe gripping → descending press fitting → grip release → raising and lowering body lifting) and try to press fit to a predetermined depth. In this press-fitting process, the steel pipe sheet pile is sometimes moved up and down with a predetermined stroke for the purpose of alleviating penetration resistance and eliminating clogging of the joint.

(中掘り装置)
中掘り装置としては、例えば図3に示すような中掘り装置を採用することができる。
以下、図3に基づいて中掘り装置の代表例の構成を説明する。
図3(A)(B)は、本発明の打設方法で利用可能な中掘り装置の構成と伸縮動作を示している。
(Inner digging equipment)
As the medium digging device, for example, a medium digging device as shown in FIG. 3 can be adopted.
Hereinafter, the configuration of a representative example of the digging apparatus will be described with reference to FIG.
3 (A) and 3 (B) show the construction and expansion / contraction operation of the digging device that can be used in the placing method of the present invention.

中掘り装置8は、吊り下げ部81と、掘削用反力を確保する反力確保部82と、その下方の地盤を掘削する掘削部83と、伸縮自在に構成された反力伝達部(内管84と外管85からなる略二重管構造)とを含んで構成されている。この中掘り装置8は、クレーン吊り下げ式の掘削装置であって、鋼管矢板を打設するに際しその本管51の内側に挿入した状態で中掘り掘削するために用いられる。   The medium digging device 8 includes a suspension part 81, a reaction force securing part 82 that secures a reaction force for excavation, an excavation part 83 that excavates the ground below it, and a reaction force transmission part (inside A substantially double tube structure comprising a tube 84 and an outer tube 85). This intermediate digging device 8 is a crane-suspended excavator, and is used for excavating an intermediate digging in a state of being inserted inside the main pipe 51 when placing a steel pipe sheet pile.

吊り下げ部81には、クレーンからのワイヤロープに繋がったスイベルが連結される。   A swivel connected to a wire rope from a crane is connected to the hanging portion 81.

反力確保部82は、ピストンロッドの先端が掘削部83に連結された油圧シリンダ86と、鋼管矢板本管51の内壁に対し反力をとるための圧着装置87とを含んで構成されている。   The reaction force securing portion 82 is configured to include a hydraulic cylinder 86 having the piston rod tip connected to the excavation portion 83 and a crimping device 87 for taking a reaction force against the inner wall of the steel pipe sheet pile main pipe 51. .

圧着装置87の圧着体88は進退動可能に設けられ、中掘り装置8が鋼管矢板の本管51内側に挿入された状態で該本管の内壁面に対し圧着される。これにより、掘削部83での掘削用反力(回転駆動装置92の回転反力,油圧シリンダ86の圧入反力)が鋼管矢板に支持される。   The crimping body 88 of the crimping device 87 is provided so as to be able to move forward and backward, and is crimped to the inner wall surface of the main pipe while the digging device 8 is inserted inside the main pipe 51 of the steel pipe sheet pile. Thereby, the reaction force for excavation in the excavation part 83 (the rotation reaction force of the rotation drive device 92 and the press-fitting reaction force of the hydraulic cylinder 86) is supported by the steel pipe sheet pile.

掘削部83は、螺旋状のフィンを備えたオーガースクリュー91と、該スクリューを回転させる回転駆動装置92と、該スクリューを囲繞するように設けられた土砂格納部93とを含んで構成されている。   The excavation unit 83 includes an auger screw 91 having a spiral fin, a rotation drive device 92 that rotates the screw, and a sediment storage unit 93 that is provided so as to surround the screw. .

筒状部材からなる土砂格納部93は、オーガースクリュー91のフィンを囲繞し、下端側に開口部を有するように設けられている。土砂格納部93の内側では、オーガースクリュー91が自在に正逆回転可能である。オーガースクリュー91のフィンによりリフトアップされてきた土砂は、格納部93の内側に収容され、その後はオーガースクリュー91フィンによって該格納部内に閉じ込められる。   The earth and sand storage portion 93 made of a cylindrical member is provided so as to surround the fin of the auger screw 91 and to have an opening at the lower end side. Inside the earth and sand storage portion 93, the auger screw 91 can freely rotate forward and backward. The earth and sand lifted up by the fins of the auger screw 91 are accommodated inside the storage portion 93 and thereafter confined in the storage portion by the auger screw 91 fin.

上記構成の反力確保部82と掘削部83は、反力確保部側に固設された油圧シリンダ86によって相互連結されている。   The reaction force securing part 82 and the excavation part 83 configured as described above are interconnected by a hydraulic cylinder 86 fixed on the reaction force securing part side.

反力伝達部(嵌合部材)は、断面角形の内管84と、同じく断面角形の外管85からなる二重管構造で構成されている。図3(B)に示すように、外管85は反力確保部82の側に固設され、内管84は掘削部83の上端に固設されている。このような構成の反力伝達部材84,85は、油圧シリンダ86の動作に従って自在に伸縮する一方で、反力確保部82で確保した回転反力を掘削部83において利用できるようにしている。   The reaction force transmission part (fitting member) is configured by a double tube structure including an inner tube 84 having a square cross section and an outer tube 85 having a square cross section. As shown in FIG. 3B, the outer tube 85 is fixed to the reaction force securing portion 82 side, and the inner tube 84 is fixed to the upper end of the excavation portion 83. The reaction force transmission members 84 and 85 having such a configuration freely expand and contract according to the operation of the hydraulic cylinder 86, while the rotational reaction force secured by the reaction force securing portion 82 can be used in the excavation portion 83.

上記構成の中掘り装置8は、掘削土を自身で保持しながら掘進する。具体的には、反力確保部82で反力を確保した状態で、図3(B)に示すように油圧シリンダ86を作動させて、オーガースクリュー91の先端ビットに押し込み作用を与える。同時に、回転駆動装置92でオーガースクリュー91を回転させてその先端ビットで対象地盤を回転掘削する。掘削により生じた土砂は、オーガースクリュー91でリフトアップされて、該スクリューを囲う土砂格納部93に収容される。   The intermediate digging device 8 configured as described above digs while holding the excavated soil itself. Specifically, with the reaction force secured by the reaction force securing portion 82, the hydraulic cylinder 86 is actuated as shown in FIG. 3 (B) to push the tip bit of the auger screw 91. At the same time, the auger screw 91 is rotated by the rotation driving device 92 and the target ground is rotated and excavated by the tip bit. The earth and sand generated by the excavation are lifted up by the auger screw 91 and stored in the earth and sand storage part 93 surrounding the screw.

格納部93が土砂でいっぱいになったら、反力確保部82での圧着を解除し、中掘り装置8をクレーンで吊り上げ、管外でオーガースクリュー91を逆回転させて排土する。   When the storage part 93 is filled with earth and sand, the pressure bonding in the reaction force securing part 82 is released, the digging device 8 is lifted with a crane, and the auger screw 91 is rotated reversely outside the pipe to be discharged.

なお、上述した中掘り装置は、あくまでも一例であって、本発明で利用可能な中掘り装置には、他の掘削装置、例えばハンマーグラブなども含まれる。   The above-described digging apparatus is merely an example, and the digging apparatus usable in the present invention includes other digging apparatuses such as a hammer grab.

(鋼管矢板打設方法)
次に図1〜図11に基づいて、上記圧入装置と中掘り装置を併用して、水底地盤に鋼管矢板を打設する方法について説明する。なお、図4〜図10では、鋼管矢板の動作や鋼管矢板本管への注水を中心として説明するため、圧入装置や中掘り装置の図示は省略しているが、本発明の実施(鋼管矢板の圧入)にあたってはこれらの機材が併用される。
(Steel sheet pile placing method)
Next, based on FIGS. 1-11, the method to drive a steel pipe sheet pile in a water bottom ground using the said press-fitting apparatus and a digging apparatus together is demonstrated. In addition, in FIGS. 4-10, in order to demonstrate centering | focusing on the operation | movement of a steel pipe sheet pile, and the water injection to a steel pipe sheet pile main pipe, illustration of a press-fitting device and a digging apparatus is abbreviate | omitted, However, implementation of this invention (steel pipe sheet pile) These presses are used in combination.

鋼管矢板の打設にあたっては、はじめに図2に示すように、圧入装置3のクランプ34で既設鋼管矢板5’を把持して該既設鋼管矢板に反力をとる。次いで、リング状チャック38に鋼管矢板5を通して、継手部52,53’同士が連結するように該鋼管矢板を位置決めし、チャック38で把持した状態で該鋼管矢板の圧入を開始する。   In placing the steel pipe sheet pile, first, as shown in FIG. 2, the existing steel pipe sheet pile 5 ′ is gripped by the clamp 34 of the press-fitting device 3 and a reaction force is applied to the existing steel pipe sheet pile. Next, the steel pipe sheet pile is positioned through the steel pipe sheet pile 5 through the ring-shaped chuck 38 so that the joint portions 52 and 53 ′ are connected to each other, and press-fitting of the steel pipe sheet pile is started in a state of being gripped by the chuck 38.

鋼管矢板圧入の初期段階では圧入装置3のみで圧入を進め、圧入が一定量進行して本管51内に土砂が進入し、貫入抵抗が増してきたら、中掘り装置を併用して本管内の土砂を掘削排土する。本管51内を中掘りし管外へ排土することで、少なくとも本管内における砂や礫の圧密は解消又は緩和されるので、ある程度の貫入抵抗の低減が期待できる。   At the initial stage of steel pipe sheet pile press-fitting, press-fitting is advanced only with the press-fitting device 3, and when the press-fitting progresses by a certain amount and earth and sand enters into the main pipe 51 and penetration resistance increases, Excavate and remove earth and sand. By digging the inside of the main pipe 51 and discharging it outside the pipe, at least the consolidation of sand and gravel in the main pipe is eliminated or alleviated, so that a certain reduction in penetration resistance can be expected.

なお、圧入装置を用いた鋼管矢板の圧入作業では、鋼管矢板が心ずれを起こさないように、時おり該鋼管矢板を上下動(昇降動)させる。すなわち、圧入途中での鋼管矢板の引き抜きを時おり繰り返しながら、目標深度まで打ち込むようにする。このように鋼管矢板を上下動させるタイミングは特に限定されないが、例えば、貫入抵抗が大きくなって圧入がやや厳しくなってきた時点で実施するのが好ましい。このように適当なタイミングで上下動を繰り返しながら圧入することで、鋼管矢板の鉛直性が確保されるとともに、貫入抵抗の緩和効果も期待できる。   In the press-fitting work of the steel pipe sheet pile using the press-fitting device, the steel pipe sheet pile is sometimes moved up and down (lifted / lowered) so that the steel pipe sheet pile does not decenter. That is, the steel pipe sheet pile is pulled out in the middle of press-fitting, and is repeatedly driven to the target depth while being repeated occasionally. Thus, although the timing which moves a steel pipe sheet pile up and down is not specifically limited, For example, it is preferable to implement when a penetration resistance becomes large and press-fit becomes somewhat severe. By press-fitting while repeatedly moving up and down at an appropriate timing in this way, the verticality of the steel pipe sheet pile can be ensured and an effect of reducing penetration resistance can be expected.

上述したように圧入装置と中掘り装置を併用して打設を進めると、図14に示すように、継手部のスリットを介して該継手部内に細砂や礫などが必然的に混入する。それが鋼管矢板圧入の際の単調な昇降(上下)運動の反復により累積し、細砂や礫が継手部内の狭隘な内空部で圧密し、やがて継手部内に目詰まりを招く。このような、鋼管矢板継手部における目詰まりは、貫入抵抗増大の要因となって、該鋼管矢板の圧入を大きく妨げる。   As described above, when the placement is advanced by using the press-fitting device and the digging device together, as shown in FIG. 14, fine sand, gravel and the like are inevitably mixed into the joint portion through the slit of the joint portion. It accumulates by repeated monotonous up-and-down (up and down) movements during the press-fitting of steel pipe sheet piles, and fine sand and gravel are consolidated in a narrow inner space within the joint, eventually leading to clogging within the joint. Such clogging in the steel pipe sheet pile joint portion causes an increase in penetration resistance and greatly hinders the press fitting of the steel pipe sheet pile.

そこで本発明では、圧入装置の油圧計などを監視して貫入抵抗を把握し、当該貫入抵抗が許容レベルを超えたときには、継手部に目詰まり(圧入を大きく妨げるほどの目詰まり)が発生したと判断して、図4に示すように、注水装置2を用いて本管内への注水を開始する。この注水装置2は、鋼管矢板5の本管内へ送水するための送水ポンプと送水管を有している。   Therefore, in the present invention, the pressure resistance of the press-fitting device is monitored to grasp the penetration resistance, and when the penetration resistance exceeds an allowable level, the joint portion is clogged (clogging that greatly hinders press-fitting). As shown in FIG. 4, water injection into the main pipe is started using the water injection device 2. The water injection device 2 has a water supply pump and a water supply pipe for supplying water into the main pipe of the steel pipe sheet pile 5.

注水装置2を用いて本管内に送水された水は、図5に示すように本管内の土砂上部に貯留され、主として、鋼管矢板下端近傍や周囲の土砂を水頭圧により加圧するとともに、継手部内における目詰まり箇所(継手部内で圧密した土砂)を該水頭圧により加圧する役割を担っている。そのため、本発明の実施にあたっては、鋼管類外部の水との間に水頭差Δhが確保・維持されるように本管内に注水する。水頭差Δhは特に限定されず、また、必ずしも一定である必要はない。ただし、水頭差が大きいほどより大きな水頭圧(継手部内の目詰まりを崩壊させるエネルギー)が得られるので、水頭差Δhは大きいほど好ましい。   The water fed into the main pipe using the water injection device 2 is stored in the upper part of the earth and sand in the main pipe as shown in FIG. 5, and mainly pressurizes the vicinity of the lower end of the steel pipe sheet pile and the surrounding earth and sand with water head pressure. It plays a role of pressurizing the clogged portion (the earth and sand consolidated in the joint portion) with the water head pressure. Therefore, in carrying out the present invention, water is poured into the main pipe so that the head difference Δh is secured and maintained with the water outside the steel pipes. The water head difference Δh is not particularly limited and is not necessarily constant. However, the larger the head difference, the greater the head pressure (energy that breaks up clogging in the joint), so the larger the head difference Δh is preferable.

なお、上述した注水作業の間は、同時並行的に圧入と中掘りも進めるのが作業効率の点で好ましいが、圧入と中掘りの双方又は一方を中断して注水を進め、注水完了後に再開するようにしてもよい。   In addition, during the above-mentioned water injection work, it is preferable from the viewpoint of work efficiency that the pressure injection and the underground digging are simultaneously performed, but the water injection is advanced by interrupting both or one of the injection and the intermediate digging, and resumes after the water injection is completed. You may make it do.

そして上述した注水が完了し、本管内に必要な水頭差Δhが確保されたら、図6に示すように水が張った状況下で、前述と同様の圧入と中掘りを継続して実行する。また圧入作業では、注水前と同様に、圧入の過程で時おり鋼管矢板の昇降を繰り返すようにする。   Then, when the above-mentioned water injection is completed and the necessary head difference Δh is secured in the main pipe, the same press-fitting and digging as described above are continuously performed under the condition of water filling as shown in FIG. In addition, in the press-fitting work, the steel pipe sheet pile is repeatedly raised and lowered occasionally during the press-fitting process, as before water injection.

そして、図6に示すように水が張った鋼管内での中掘りが進行して、中掘りが本管下端付近にまで達し、図7に示すように鋼管矢板本管内側の土砂が排土されると、鋼管内の水が水頭圧を受けて管外へ一気に流出し始める。そして、水頭圧を受けた水が本管外周面に沿って継手部に達すると、継手部内で目詰まりしている土砂に対して、水頭圧による押込み作用が働き、当該目詰まり箇所を上方へ向けて押圧する。   Then, as shown in FIG. 6, the inside digging progresses in the steel pipe filled with water, and the inside digging reaches to the vicinity of the lower end of the main pipe, and the earth and sand inside the steel pipe sheet pile main pipe is discharged as shown in FIG. When this happens, the water in the steel pipe starts to flow out of the pipe at a stretch under the head pressure. Then, when the water subjected to the head pressure reaches the joint part along the outer peripheral surface of the main pipe, the pushing action by the head pressure acts on the clogged soil in the joint part, and the clogged portion is moved upward. Press towards.

このとき同時に、圧入の過程で時おり鋼管矢板の上下動を繰り返すことで、継手部内の目詰まり箇所に対して「押し上げ作用」や「揺さぶり作用」などの複合作用が働き、停滞している目詰まり箇所の土砂に流動を促す。また、鋼管矢板の上下動を繰り返すことで、本管下端を塞いでいた土砂が一時的に抜けて(鋼管矢板の上昇時に抜ける)、そのタイミングで本管内の加圧水が一気に流出し、より大きな水頭圧が継手部内の目詰まり箇所に作用する。   At the same time, by repeating the vertical movement of the steel pipe sheet pile occasionally during the press-fitting process, the combined action such as “push-up action” and “swaying action” works on the clogged part in the joint, and the stagnant eye Encourage fluidity in the clogged soil. In addition, by repeating the vertical movement of the steel pipe sheet pile, the earth and sand that blocked the main pipe lower end is temporarily removed (when the steel pipe sheet pile rises), and at that timing, pressurized water in the main pipe flows out at once, and a larger head Pressure acts on the clogged portion in the joint.

すると、継手部内で圧密した土砂(目詰まり箇所)が、前述した水頭圧が作用する状況化で徐々にほぐれ始め、圧密土砂の塊の崩壊が徐々に上方へ伝搬し、やがてあるタイミングで、崩壊してバラけた土砂が水頭圧によって一気に吹き上がって、当該土砂の一部が水とともに継手部の上端開口部から噴出する。この様子を図8に示す。したがって、本管内に水を張って、継手部の目詰まり箇所に水頭圧を印加することで、継手部が断続的にフラッシングされて該継手部の目詰まりが解消される。   Then, the compacted soil (clogged portion) in the joint part gradually begins to loosen in the situation where the hydraulic head pressure acts, and the collapse of the compacted soil lump gradually propagates upward, and eventually collapses. Then, the loose earth and sand are blown up at a stretch by the water head pressure, and a part of the earth and sand is ejected from the upper end opening of the joint part together with water. This is shown in FIG. Therefore, by filling the main pipe with water and applying water head pressure to the clogged portion of the joint, the joint is intermittently flushed, and the clogging of the joint is eliminated.

また、上述した注水完了後に本管内に中掘り装置を挿入すると、該中掘り装置がピストンの如く作用して、瞬間的に水圧が高まって水底方向を大きく加圧する。これにより、その高まった圧力が継手内部へ伝搬し、その継手内部における目詰まり箇所に作用する。したがって、本管内に水頭差Δhが確保された状態で、中掘り装置を挿入することで、継手部における目詰まり解消がより一層期待できる。   Further, when the digging device is inserted into the main pipe after the completion of the water injection described above, the digging device acts like a piston, and the water pressure is instantaneously increased to greatly increase the water bottom direction. As a result, the increased pressure propagates to the inside of the joint and acts on the clogged portion inside the joint. Therefore, the clogging at the joint portion can be further expected to be eliminated by inserting the digging device in a state where the water head difference Δh is secured in the main pipe.

なお、従来の場合では図16に示すように、中掘り装置を引き抜く際の吸引作用により、鋼管矢板の外周面に対し締め付け作用が働き、該鋼管矢板の貫入抵抗を増大させるといった問題が生じていた。
しかしながら本発明によれば、本管内に必要量の水を注水しておくことで、鋼管矢板の下方や周囲に水頭圧を作用させることができ、その結果、中掘り装置の引き抜きに伴う吸引作用を相殺または軽減できる(図9参照)。したがって、中掘り装置の引き抜き時における締め付け作用・吸い上げ作用を抑制または緩和し、圧入と中掘りの併用のメリットを最大限に発揮させることが可能になる。
In the conventional case, as shown in FIG. 16, the suction action when pulling out the digging device causes a tightening action on the outer peripheral surface of the steel pipe sheet pile, resulting in an increase in penetration resistance of the steel pipe sheet pile. It was.
However, according to the present invention, by pouring a necessary amount of water into the main pipe, water head pressure can be applied below and around the steel pipe sheet pile, and as a result, the suction action that accompanies the extraction of the digging apparatus. Can be offset or reduced (see FIG. 9). Therefore, it is possible to suppress or alleviate the tightening action / sucking action at the time of pulling out the inside digging apparatus, and to maximize the merit of the combined use of press fitting and inside digging.

以後、図5に示すように本管内に貯水した状態を維持しながら、圧入装置と中掘り装置を併用して鋼管矢板の打設を進める。その過程で継手部の内部では、圧入の進行に伴う土砂の目詰まりと、水頭圧による目詰まり解消(継手部の上端からの噴出)とが繰り返され、その度に、圧入の進行に伴って増大した貫入抵抗が一気に軽減されて、以後の圧入装置による静的圧入を可能にする。   Thereafter, as shown in FIG. 5, the steel pipe sheet pile is driven by using the press-fitting device and the digging device together while maintaining the state of storing water in the main pipe. During the process, clogging of the earth and sand accompanying the progress of press-fitting and clogging due to water head pressure (ejection from the upper end of the joint) are repeated, and each time the press-fitting progresses, The increased penetration resistance is alleviated at a stretch, enabling a static press-fitting by a subsequent press-fitting device.

そして、圧入と中掘りを進めた結果、打設が最終段階に差し掛かり、残りの打設量が僅かになると、鋼管矢板の長さ(管外の水位より上に突き出た部分の長さ)が短くなる。したがって打設が最終段階に至ると、本管の長さが足りず、このままでは本管内側に必要な水頭差Δhを確保できなくなる。   And, as a result of proceeding with the press-fitting and digging, when the placement is about to reach the final stage and the remaining placement amount becomes small, the length of the steel pipe sheet pile (the length of the part protruding above the water level outside the pipe) Shorter. Therefore, when the placement reaches the final stage, the length of the main pipe is insufficient, and if it remains as it is, the required head difference Δh cannot be secured inside the main pipe.

そこで本発明では、鋼管矢板の圧入が進み、打設残量が少なくなってきたら、図10に示すように該鋼管矢板本管の頭部にヤットコなどのパイプ類4を継ぎ足すようになっている。これにより、圧入長さが残り僅かとなって、鋼管矢板の残部(残りの打設長さ)だけでは水頭差Δhを確保できなくなっても、その頭部にパイプ類を延設することで貯水空間(水頭圧を作り出すための貯水空間)の嵩が増し、必要量の水頭差を確保できる。   Therefore, in the present invention, when the steel pipe sheet pile is press-fitted and the remaining amount of casting is reduced, pipes 4 such as Yatsuko are added to the head of the steel pipe sheet pile main pipe as shown in FIG. Yes. As a result, the press-fit length remains a little, and even if the remaining portion of the steel pipe sheet pile (remaining placement length) cannot secure the head difference Δh, water is stored by extending pipes to the head. The volume of the space (water storage space for creating water head pressure) increases, and the required amount of water head difference can be secured.

以上の工程を経て、鋼管矢板を目標深度まで打設したら、本管頭部に延設したヤットコを切り離して、鋼管矢板一本の打設が完了する。   When the steel pipe sheet pile is driven to the target depth through the above steps, the steel pipe sheet pile is completed by cutting the yatco extended to the main pipe head.

上述した本発明によれば、図11(A)に示すように、鋼管矢板の圧入の進行に伴って貫入抵抗が増加するものの、水頭圧によるフラッシングが繰り返されるたびに貫入抵抗が急低下するので、鋼管矢板が目標深度に達するまで圧入不能に陥ることを確実に回避できる。なお、水頭圧を利用しない従来方法の場合では、図11(B)(C)に示すように、鋼管矢板の圧入の進行に伴って継手部に目詰まりが発生し、そのままの状態で圧入を進めるので、地盤によっては、やがて貫入抵抗が圧入不能レベルに至る。そのため、作業を中止するか、低振動・低騒音の要請に反する打撃力に頼った打設を行うことになる。   According to the present invention described above, as shown in FIG. 11 (A), although the penetration resistance increases with the progress of the press-fitting of the steel pipe sheet pile, the penetration resistance sharply decreases every time flushing by the water head pressure is repeated. The steel pipe sheet pile can be surely avoided from being press-fit until reaching the target depth. In the case of the conventional method that does not use the water head pressure, as shown in FIGS. 11 (B) and 11 (C), as the press-fitting of the steel pipe sheet pile progresses, the joint portion is clogged, and the press-fitting is performed as it is. As it advances, depending on the ground, the penetration resistance will eventually reach a level where it cannot be pressed. For this reason, the operation is stopped or the driving is performed depending on the striking force against the request for low vibration and low noise.

(鋼管矢板頭部に接続するパイプ類の好適実施例)
鋼管矢板本管に延設するパイプ類はヤットコに限定されず、鋼管矢板頭部に接続可能であって、水頭圧を作り出す貯水空間の嵩を増すことができるものであれば、いかなるものでも採用できる。このようなパイプ類のより好ましい実施形態としては、例えば図12に示すようなものが挙げられる。図12(A)はパイプ類の好適実施例の一つを示す全体図であり、図12(B)はこのパイプ類の下端側の透視図であるとともに、鋼管矢板頭部に接続した様子を示す拡大図である。
(Preferred embodiment of pipes connected to steel pipe sheet pile head)
The pipes that extend to the steel pipe sheet pile main pipe are not limited to Yatco, but any pipe that can be connected to the steel pipe sheet pile head and that can increase the volume of the water storage space that creates head pressure is adopted. it can. As a more preferred embodiment of such pipes, for example, one shown in FIG. FIG. 12 (A) is an overall view showing one preferred embodiment of the pipes, and FIG. 12 (B) is a perspective view of the lower end side of the pipes and a state where it is connected to the steel pipe sheet pile head. It is an enlarged view shown.

図12に示すパイプ類7は、下端にシールリング70を具備するパイプ類本体71と、該パイプ類本体を鋼管矢板本管に接続したときにその直立姿勢(鋼管矢板に対して真っ直ぐ繋がった立設状態)を維持固定するための姿勢保持手段72を有している。この姿勢保持手段72は、図12(A)に示すようにパイプ類本体71の下端側を包囲するように且つ一体的に設けられており、パイプ類本体71を鋼管矢板本管に接続するための円筒状接続部73と、該接続部の両脇に溶接された2本の棒状スパイク74,74とを有している。   The pipes 7 shown in FIG. 12 have a pipe main body 71 having a seal ring 70 at the lower end, and an upright posture (standing upright connected to the steel pipe sheet pile when the pipe main body is connected to the steel pipe sheet pile main pipe. A posture holding means 72 for maintaining and fixing the installed state). As shown in FIG. 12 (A), this posture holding means 72 is integrally provided so as to surround the lower end side of the pipe body 71 and connects the pipe body 71 to the steel pipe sheet pile main pipe. And the two rod-like spikes 74 and 74 welded to both sides of the connecting portion.

鋼管などからなるパイプ類本体71の下端には、図12(B)に示すように、ゴム製のシールリング70(止水材)が取り付けられている。円筒状接続部73は、図12(B)に示すように、パイプ類本体71の下端側部分およびシールリング70を包囲した状態で、該パイプ類本体の外周面に溶接されている。   As shown in FIG. 12 (B), a rubber seal ring 70 (water-stopping material) is attached to the lower end of the pipe body 71 made of a steel pipe or the like. As shown in FIG. 12 (B), the cylindrical connecting portion 73 is welded to the outer peripheral surface of the pipe body while surrounding the lower end portion of the pipe body 71 and the seal ring 70.

円筒状の接続部73の両脇には、棒状のスパイク74,74が固設されている。このスパイク74,74は、その下端側が接続部73の下から突き出るように接続部外周面に固設され、パイプ類の立設姿勢(鋼管矢板本管の頭部に接続した状態)を維持する役割を担っている。   On both sides of the cylindrical connection portion 73, rod-like spikes 74 and 74 are fixed. The spikes 74 and 74 are fixed to the outer peripheral surface of the connecting portion so that the lower end side protrudes from the bottom of the connecting portion 73, and maintain the standing posture of the pipes (the state connected to the head of the steel pipe sheet pile main pipe). Have a role.

上記構成のパイプ類7を鋼管矢板頭部に接続するときには、図12(B)に示すように本管頭部を円筒状接続部73の下側から挿入する。そのとき、図示するように、接続部下端から突き出したスパイク74,74の先端側が、それぞれ鋼管矢板の継手部内に進入するように位置決めする。このように位置決めした状態でパイプ類7を吊り降ろすと、図示するように、鋼管矢板本管が円筒状接続部73に進入して挿し込まれると同時に、スパイク74,74が継手部内に進入し、やがて、接続部73内において本管上端がパイプ類本体71の下端にあるシールリング70に当接して、パイプ類7の接続が完了する。この接続状態で、パイプ類本体71と鋼管矢板本体とは、図12(B)に示するように真っ直ぐに繋がっており、両者の間にはシールリング70が密接状態で介在して継ぎ目からの水漏れを防いでいる。   When connecting the pipes 7 having the above configuration to the steel pipe sheet pile head, the main pipe head is inserted from the lower side of the cylindrical connecting portion 73 as shown in FIG. At that time, as shown in the drawing, positioning is performed so that the tip ends of the spikes 74 protruding from the lower end of the connecting portion enter the joint portion of the steel pipe sheet pile. When the pipes 7 are suspended in the state of being positioned as described above, as shown in the drawing, the steel pipe sheet pile main pipe enters and is inserted into the cylindrical connecting portion 73, and at the same time, the spikes 74 and 74 enter the joint portion. Eventually, the upper end of the main pipe abuts on the seal ring 70 at the lower end of the pipe body 71 in the connection portion 73, and the connection of the pipes 7 is completed. In this connected state, the pipe main body 71 and the steel pipe sheet pile main body are connected straightly as shown in FIG. 12 (B), and a seal ring 70 is interposed in close contact between the two from the joint. Prevents water leakage.

このような構成のパイプ類を利用することで、鋼管矢板へのパイプ類の接続作業を簡単、迅速、かつ確実に行うことができる。また、鋼管矢板本管とパイプ類本体との継ぎ目を接続部が包囲するとともに、パイプ類側のスパイクが鋼管矢板の継手部に突き刺さるので、衝撃等を受けてもパイプ類の接続姿勢が確実に維持されるといった優れた効果が達成される。また注水時において、水がパイプ類と鋼管矢板本管の継ぎ目から漏れることがないので、注水作業を無駄なく効率的に進めることができる。さらに、パイプ類と鋼管矢板本管との継ぎ目にシールリングを密接状態で介在させることで、継ぎ目での水漏れが確実に防止され、必要な水頭圧を確実に維持できるようになる。   By using the pipes having such a configuration, the connection work of the pipes to the steel pipe sheet pile can be performed easily, quickly and reliably. In addition, the joint between the steel pipe sheet pile main and the pipe body surrounds the connection part, and the spike on the pipe side pierces the joint part of the steel pipe sheet pile, so that the connection posture of the pipes is ensured even when subjected to impacts, etc. An excellent effect of being maintained is achieved. Further, at the time of water injection, water does not leak from the joint between the pipes and the steel sheet pile main pipe, so that the water injection work can be efficiently advanced without waste. Further, by interposing the seal ring in a close state at the seam between the pipes and the steel pipe sheet pile main body, water leakage at the seam can be surely prevented, and the necessary head pressure can be reliably maintained.

(他の実施例)
上述した実施形態では、鋼管類の代表例として鋼管矢板を挙げ、本発明を鋼管矢板打設工に適用する場合を例示したが、本発明の実施形態はこれに限定されない。例えば、オールケーシング工法におけるケーシングチューブの圧入や、仮橋・仮桟橋工における鋼管杭の打設などにも適用することができる。
(Other examples)
In embodiment mentioned above, the steel pipe sheet pile was mentioned as a typical example of steel pipes, and the case where this invention was applied to a steel pipe sheet pile driving construction was illustrated, However, Embodiment of this invention is not limited to this. For example, the present invention can also be applied to casing tube press-fitting in the all-casing construction method, and steel pipe pile placement in temporary bridge / temporary pier construction.

また上述した実施形態では、中掘り装置の代表例として「スクリュードライバ」と称されるタイプの掘削装置を挙げたが、本発明で採用可能な中掘り装置はこれに限定されず、鋼管類に対し出し入れ自在であって、その内側の土砂を掘削排土可能なものであればいかなるものでも採用可能である。例えば、中掘り装置としてハンマーグラブを用いることも可能である。   In the above-described embodiment, the excavator of the type called “screw driver” is given as a representative example of the excavator, but the excavator that can be used in the present invention is not limited to this, and the steel pipes Any material can be used as long as it can be inserted into and removed from and can excavate and remove the inner soil. For example, a hammer grab can be used as the digging device.

2 注水装置
3 鋼管矢板圧入装置
4 パイプ類(ヤットコ)
5 鋼管矢板
5’ 鋼管矢板
7 パイプ類(ヤットコ)
8 中掘り装置
31 本体
33 既設杭把持部
34 クランプ
35 スライドベース
37 昇降体
38 チャック
39 油圧シリンダ
51 本管
51’ 本管
52 継手部
52’ 継手部
53 継手部
53’ 継手部
70 シールリング(止水材)
71 パイプ類本体
72 姿勢保持手段
73 円筒状接続部
74 棒状スパイク
81 吊り下げ部
82 反力確保部
83 掘削部
84 内管
85 外管
86 油圧シリンダ
87 圧着装置
88 圧着体
89 回転駆動装置
91 オーガースクリュー
92 回転駆動装置
93 土砂格納部
2 Water injection device 3 Steel pipe sheet pile press-in device 4 Pipes (Yatco)
5 Steel pipe sheet pile 5 'Steel pipe sheet pile 7 Pipes (Yatco)
8 Drilling device 31 Main body 33 Existing pile holding part 34 Clamp 35 Slide base 37 Lifting body 38 Chuck 39 Hydraulic cylinder 51 Main pipe 51 'Main pipe 52 Joint part 52' Joint part 53 Joint part 53 'Joint part 70 Seal ring Water material)
71 Pipe main body 72 Posture holding means 73 Cylindrical connecting portion 74 Bar shaped spike 81 Suspension portion 82 Reaction force securing portion 83 Excavating portion 84 Inner tube 85 Outer tube 86 Hydraulic cylinder 87 Crimping device 88 Crimping body 89 Rotating drive device 91 Auger screw 92 Rotation Drive 93 Sediment Storage Unit

Claims (8)

鋼管類の中掘りを併用して該鋼管類を圧入する方法において、水頭圧により加圧するための液体を鋼管類内に注入することを特徴とする鋼管類の圧入方法。   A method for press-fitting steel pipes by injecting a liquid for pressurization by hydraulic head pressure into the steel pipes in a method for press-fitting the steel pipes together with the excavation of steel pipes. 鋼管類の中掘りを併用して該鋼管類を圧入する方法において、
鋼管類を圧入する工程と、
前記鋼管類内に中掘り装置を挿入して掘削する工程と、
水頭圧により加圧するための液体を前記鋼管類内に注入する工程と、
を含むことを特徴とする鋼管類の圧入方法。
In the method of press-fitting the steel pipes together with the excavation of the steel pipes,
A process of press-fitting steel pipes;
Inserting a digging device into the steel pipes and excavating;
Injecting a liquid for pressurization by water head pressure into the steel pipes;
A method for press-fitting steel pipes, characterized by comprising:
前記液体が鋼管類内に注入された状況下で該鋼管類を圧入し、その圧入過程で時おり該鋼管類を昇降動させる、ことを特徴とする請求項1又は2に記載の鋼管類の圧入方法。   The steel pipes according to claim 1 or 2, wherein the steel pipes are press-fitted under a condition where the liquid is injected into the steel pipes, and the steel pipes are sometimes moved up and down during the press-fitting process. Press-in method. 鋼管類外部との間に水頭差が生じるように前記液体を鋼管類内に注入する、ことを特徴とする請求項1又は2に記載の鋼管類の圧入方法。   The method for press-fitting steel pipes according to claim 1 or 2, wherein the liquid is injected into the steel pipes so that a water head difference occurs between the outside of the steel pipes. 水頭差を確保するためのパイプ類を前記鋼管類に継ぎ足す、ことを特徴とする請求項4に記載の鋼管類の圧入方法。   5. The method for press-fitting steel pipes according to claim 4, wherein pipes for securing a head difference are added to the steel pipes. 前記鋼管類には鋼管矢板が含まれることを特徴とする請求項1乃至5のいずれかに記載の鋼管類の圧入方法。   The method for press-fitting steel pipes according to any one of claims 1 to 5, wherein the steel pipes include a steel pipe sheet pile. 貯液空間を確保するために鋼管類頭部に継ぎ足して用いられるパイプ類。   Pipes that are used in addition to the steel pipe heads to secure liquid storage space. 鋼管類頭部に継ぎ足したときの姿勢を維持するための姿勢保持手段を具備することを特徴とする請求項7に記載のパイプ類。   8. Pipes according to claim 7, further comprising posture holding means for maintaining the posture when added to the steel pipe head.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015229860A (en) * 2014-06-04 2015-12-21 株式会社横山基礎工事 Method to control groundwater movement in excavated pit, grout filling method, and water storage means
JP2018115511A (en) * 2017-01-20 2018-07-26 株式会社技研製作所 Joint structure for steel pipe sheet pile, and method for constructing steel pipe sheet pile

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JPH08232264A (en) * 1995-02-24 1996-09-10 Giken Seisakusho Co Ltd Method for driving structure
JP2004068398A (en) * 2002-08-06 2004-03-04 Geotop Corp Construction method and construction device for pile

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Publication number Priority date Publication date Assignee Title
JPS5479904A (en) * 1977-12-09 1979-06-26 Shimizu Construction Co Ltd Method of construction of reverse intermediate excavation presssin and reverse intermediate excavation presssin device used for said method
JPH08232264A (en) * 1995-02-24 1996-09-10 Giken Seisakusho Co Ltd Method for driving structure
JP2004068398A (en) * 2002-08-06 2004-03-04 Geotop Corp Construction method and construction device for pile

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015229860A (en) * 2014-06-04 2015-12-21 株式会社横山基礎工事 Method to control groundwater movement in excavated pit, grout filling method, and water storage means
JP2018115511A (en) * 2017-01-20 2018-07-26 株式会社技研製作所 Joint structure for steel pipe sheet pile, and method for constructing steel pipe sheet pile
JP7049766B2 (en) 2017-01-20 2022-04-07 株式会社技研製作所 Joint structure of steel pipe sheet pile and construction method of steel pipe sheet pile

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