JP2014185427A - Steel pipe head part attachment, water injection structure to steel pipe inside, steel pipe structure and press-in method of steel pipe - Google Patents
Steel pipe head part attachment, water injection structure to steel pipe inside, steel pipe structure and press-in method of steel pipe Download PDFInfo
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Abstract
Description
本発明は、鋼管矢板、鋼管杭、ケーシングチューブ、ケーシングパイプなどの鋼管類を地盤に打設または圧入する際に、該鋼管類の頭部に着脱自在に接続して用いられるアタッチメントに関するものである。また本発明は、鋼管類を打設または圧入する際に、該鋼管類内側へ注水するための構造に関するものである。さらに本発明は、そのような注水機能を具備する鋼管類の構造に関するものである。さらに本発明は、鋼管類内側への注水を利用した鋼管類圧入方法に関するものである。 TECHNICAL FIELD The present invention relates to an attachment that is used by being detachably connected to the head of a steel pipe when a steel pipe such as a steel pipe sheet pile, a steel pipe pile, a casing tube, or a casing pipe is placed or press-fitted into the ground. . The present invention also relates to a structure for pouring water into the steel pipe when the steel pipe is cast or press-fitted. Furthermore, this invention relates to the structure of the steel pipes which comprise such a water injection function. Furthermore, this invention relates to the steel pipe press injection method using the water injection to the inside of steel pipes.
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１０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. 10 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、鋼管圧入時の貫入抵抗を低減する手段として、図１０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, it has been pointed out by the applicant of the present invention that when steel pipe sheet piles are press-fitted, sand or gravel is formed in the main pipe or at the lower end ground, resulting in large penetration resistance and hindering the press-fitting. Therefore, as a means for reducing the penetration resistance at the time of steel pipe press-fitting, it is also possible to use an internal digging device as shown in FIG. 10 and to dig an inside of the main pipe in parallel with the press-fitting of a steel pipe sheet pile by the press-fitting device. Proposed by a person.
具体的には図１１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鋼管矢板本管内に挿入し、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鋼管矢板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. 11, the 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, an intermediate digging device suspended by a crane is inserted into the steel sheet pile main pipe, the inside is excavated, 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 steel pipe sheet pile main pipe at an appropriate timing to be discharged outside the pipe.
ところが、このような鋼管矢板の打設において、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１２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。 However, in the placement of such steel pipe sheet piles, sand and gravel consolidation that hinders press-fitting occurs not only in the main pipe and the bottom ground, but also in the joint 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るため、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。一方、その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。 Since such clogging in the steel pipe sheet pile joint portion causes an increase in penetration resistance, there is no end to the case where the penetration is not possible during the construction even when the above-described press-fitting device and the digging device are used in combination. On the other hand, when the steel pipe sheet pile falls into a state where it cannot penetrate, conventionally, it 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.
そこで、本願出願人による別発明（本願出願時点で未公開）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、図１３に示すように、鋼管矢板の本管内に注水を行うことが提案されている。本管内に貯水された水の圧力（水頭圧）は、本管下方の内側および外側に沿って伝搬し、更には継手部の内空部へと伝搬する。この伝搬圧力（水頭圧）が、図１４に示すように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、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。 Therefore, in another invention by the applicant of the present application (not disclosed at the time of filing this application), for example, when a steel pipe sheet pile is placed using both press-fitting and digging, water is poured into the main pipe sheet pile as shown in FIG. Has been proposed to do. The pressure (water head pressure) of the water stored in the main pipe propagates along the inner side and the outer side below the main pipe, and further propagates to the inner space of the joint. This propagation pressure (water head pressure) affects the earth and sand causing clogging in the joint as shown in FIG. 14, acts in the direction of pushing this earth and sand upward, and contributes greatly to the elimination of clogging. . Therefore, even at construction sites where joints are likely to become clogged, clogging can be eliminated and penetration resistance can be reduced, so steel pipe sheet piles can be placed reliably with low vibration and noise without relying on striking force. become able to.
（注水作業に関する問題）
鋼管類の圧入と同時並行で中掘り掘削を行う際に鋼管内に注水を行う方法には、上述した目詰まり解消といったメリットのほか、ボイリングの抑制などといったメリットもあるため、鋼管類への注水は、目詰まりやボイリングなどを抑制する有効な手段として大いに注目されている。その具体的な注水方法としては、例えば図１３に示すように、略Ｌ字状の注水管の先端側を鋼管内に挿入し、該注水管を鋼管に引っかけたり或いは固定した状態で、ポンプで送水することが提案されている。
(Problems related to water injection work)
In addition to eliminating the clogging mentioned above, the method of injecting water into the steel pipe when carrying out medium digging in parallel with the press fitting of the steel pipe has the advantage of suppressing boiling, so water injection into the steel pipe Is attracting much attention as an effective means of suppressing clogging and boiling. As a specific water injection method, for example, as shown in FIG. 13, the front end side of a substantially L-shaped water injection pipe is inserted into a steel pipe, and the water injection pipe is hooked or fixed to the steel pipe. It has been proposed to send water.
しかしながら図１３に示すように、送水管を鋼管に挿入したり、鋼管に引っかけて固定する方法では、後付けの送水管が中掘り装置の出し入れの妨げになるため、注水作業の間は中掘り装置を出し入れすることができない。すなわち、注水管を図１３に示すように鋼管に取り付けて注水している間は、中掘り装置による掘削を一時的に中断する必要があり、その間圧入を進めることができなくなる（又は圧入が困難となる）ため、作業効率の点で問題があると指摘されていた。 However, as shown in FIG. 13, in the method of inserting the water pipe into the steel pipe or fixing it by hooking it to the steel pipe, the retrofitted water pipe hinders the insertion and removal of the middle digging apparatus. I can't get in and out. That is, while the water injection pipe is attached to the steel pipe as shown in FIG. 13, it is necessary to temporarily interrupt the excavation by the medium digging device, and during that time, it becomes impossible to proceed with the press-fitting (or press-fitting is difficult). Therefore, it was pointed out that there was a problem in terms of work efficiency.
また、鋼管外部との水頭差（図１４に示す水頭差Δｈ）を一定以上に維持する必要があるため、圧入と中掘りの進行に伴って注水を繰り返す必要があり、そのたびに注水管を設置し取外すことになるため、注水作業に手間と時間がかかり、効率が悪く施工時間の延長を招くといった問題が指摘されていた。 Moreover, since it is necessary to maintain the water head difference with the outside of the steel pipe (water head difference Δh shown in FIG. 14) to a certain level or more, it is necessary to repeat water injection as the press-fitting and digging progress. Since it would be installed and removed, water injection work took time and effort, and the efficiency was poor and the construction time was extended.
さらに、上述したように注水作業の間は、中掘り装置を鋼管類に挿入できなくなるので、一時的に掘削作業が中断され、鋼管類の圧入と中掘りの併用のメリットが阻害されるとの問題が指摘されていた。 Furthermore, as described above, during the water injection operation, the digging device cannot be inserted into the steel pipes, so the digging work is temporarily interrupted, and the merit of combined use of the steel pipe press fitting and the intermediate digging is hindered. The problem was pointed out.
さらに、図１３に示すような注水は、前述した鋼管矢板の打設のほか、鋼管類の回転圧入を伴う工法（例えばオールケーシング工法でのケーシングチューブ内への注水）への採用も検討されているが、この種の工法で注水を行う場合には、鋼管に取り付けた注水管が回転圧入の妨げとなってしまう。そのため、注水作業の間は回転圧入を中断する必要があり、注水により鋼管類圧入の進行に遅れが生じ、施工時間の延長を招くといった問題が指摘されていた。 Furthermore, the water injection as shown in FIG. 13 is considered to be applied to a construction method (for example, water injection into a casing tube in the all casing construction method) in addition to the above-described steel pipe sheet pile placement. However, when water is injected by this type of construction method, the water injection pipe attached to the steel pipe hinders the rotary press-fitting. Therefore, it is necessary to interrupt the rotary press-fitting during the water injection work, and there has been a problem that the water injection delays the progress of the steel pipe press-fitting and causes the construction time to be extended.
（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、鋼管類への注水を省力で簡単に行うことができ、且つ、圧入や中掘りの中断を招くことなく鋼管類への注水作業を同時並行で進めることができ、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頭部アタッチメント、鋼管類内側への注水構造、鋼管類構造、および鋼管類の圧入方法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 easily perform water injection to the steel pipes with labor savings, and simultaneously perform water injection work to the steel pipes without causing any interruption of press-fitting or digging. Providing steel pipe head attachment, water injection structure to the inside of steel pipe, steel pipe structure, and steel pipe press-in method that can be performed in parallel and maximize the effect of combined use of press-fitting device and digging device There is.
上記目的は、鋼管類内側への注水手段を具備する鋼管類頭部アタッチメントによって達成される。 The above-described object is achieved by a steel pipe head attachment having water injection means inside the steel pipe.
前記注水手段は、鋼管類内側を通る掘削装置の昇降動作を妨げないように構成されていることが好ましい。 It is preferable that the water injection means is configured not to hinder the lifting / lowering operation of the excavator passing through the inside of the steel pipes.
また前記アタッチメントは、掘削装置を鋼管類内側方向へ案内可能なガイド部を具備することが好ましい。 Moreover, it is preferable that the said attachment comprises a guide part which can guide an excavation apparatus to steel pipe inner side direction.
また前記アタッチメントは、自己を鋼管類頭部に接続するための接続部を具備することが好ましい。 Moreover, it is preferable that the said attachment comprises a connection part for connecting self to a steel pipe head.
また前記注水手段は、前記ガイド部に形成されていることが好ましい。 Moreover, it is preferable that the said water injection means is formed in the said guide part.
また前記接続部は、前記ガイド部に対して相対回転可能に設けられていることが好ましい。 Moreover, it is preferable that the said connection part is provided so that relative rotation with respect to the said guide part is possible.
また上記目的は、鋼管類を圧入するとともに中掘りする際に利用され、掘削装置の昇降経路側へ突出しないように形成された、鋼管類内側への注水構造によって達成される。このような注水構造は、例えば上述したアタッチメントの一部から構成されてもよく、或いは、鋼管類上端側の側壁に形成した注水専用の孔から構成されてもよい。 Further, the above object is achieved by a water injection structure to the inside of the steel pipes, which is used when the steel pipes are press-fitted and dug inside, and is formed so as not to protrude toward the lifting path side of the excavator. Such a water injection structure may be comprised from a part of attachment mentioned above, for example, or may be comprised from the hole only for water injection formed in the side wall by the side of steel pipe upper end.
また上記目的は、鋼管類内側への注水手段を具備する鋼管類によって達成される。 Moreover, the said objective is achieved by the steel pipe which comprises the water injection means to the inside of a steel pipe.
また上記目的は、鋼管類の圧入及び/又は中掘りと同時並行で、鋼管類内側を通る掘削装置の昇降動作を妨げないように鋼管類内側に注水する、ことを特徴とする鋼管類圧入方法によって達成される。この方法で注水を実施する際には、上述したアタッチメントを利用してもよく、或いは、このようなアタッチメントを用いる代わりに鋼管類側壁に貫通孔をあけて、その孔に注水管を接続して注水するようにしてもよい。 In addition, the above-mentioned purpose is to inject the water into the steel pipe so as not to hinder the lifting and lowering operation of the excavator passing through the inside of the steel pipe in parallel with the press-fitting and / or digging of the steel pipe. Achieved by: When performing water injection by this method, the above-mentioned attachment may be used, or instead of using such an attachment, a through hole is formed in the side wall of the steel pipe, and the water injection pipe is connected to the hole. Water may be injected.
本発明のアタッチメントは注水手段を一体的に具備しているので、鋼管類頭部に取り付けるだけで簡単に鋼管類内側への注水を開始できる。 Since the attachment of the present invention is integrally provided with water injection means, it is possible to easily start water injection into the inside of the steel pipe simply by attaching it to the head of the steel pipe.
本発明のアタッチメントの注水手段は、鋼管類内側を通る掘削装置の昇降動作を妨げないので、鋼管類の中掘りと同時並行で鋼管類内側への注水を進めることができる。したがって、鋼管類の圧入や打設において注水を行う場合であっても、中掘り作業を中断して注水完了を待つ必要がないので、注水待ちによる施工時間の延長を回避できる。このような注水手段は、例えばアタッチメントの内側空間に突出しない注水構造（注水口など）で構成される。 Since the water injection means of the attachment of the present invention does not hinder the lifting / lowering operation of the excavator passing through the inside of the steel pipes, it is possible to advance the water injection to the inside of the steel pipes in parallel with the middle excavation of the steel pipes. Therefore, even when water injection is performed in press-fitting or placing of steel pipes, it is not necessary to interrupt the excavation work and wait for the completion of water injection, so that it is possible to avoid the extension of the construction time due to the water injection waiting. Such a water injection means is comprised by the water injection structure (water injection port etc.) which does not protrude into the inner space of an attachment, for example.
本発明のアタッチメントは、鋼管類圧入時にその頭部に接続して用いられ、掘削装置を鋼管類内側方向へガイドする機能を備えるとともに、注水口などの注水手段を具備している。したがって、鋼管類頭部に接続したままの状態で、掘削装置ガイドとして利用でき、同時に、注水器具としても利用できる。また、注水を終えても鋼管頭部に装着したままでよく、鋼管類への注水の開始・完了のたびに、注水管の設置と取外しを繰り返す必要がないので、鋼管類への注水作業を省力で行うことができる。 The attachment of the present invention is used by being connected to the head of a steel pipe when it is press-fitted, and has a function of guiding the excavator in the direction of the inside of the steel pipe, as well as water injection means such as a water injection port. Therefore, it can be used as a drilling equipment guide while being connected to the steel pipe head, and can also be used as a water injection device. In addition, it is possible to leave the pipe mounted on the steel pipe head even after the water injection is completed, and it is not necessary to repeat the installation and removal of the water injection pipe every time water injection is started and completed. It can be done with labor saving.
本発明のアタッチメントは、掘削装置のガイド機能とともに注水機能（掘削装置の出し入れを妨げない注水手段）を備えているので、鋼管類への注水と同時に、中掘り用の掘削装置を出し入れできる。したがって、圧入工程・中掘り工程と同時並行で、鋼管類への注水を進めることができるので、注水による施工時間の延長を招くことがない。 Since the attachment of the present invention has a water injection function (a water injection means that does not hinder the insertion and removal of the excavator) as well as the guide function of the excavator, the excavator for medium excavation can be taken in and out at the same time as water injection into the steel pipes. Therefore, water injection into the steel pipes can be performed simultaneously with the press-fitting process and the underground digging process, so that the construction time due to the water injection is not extended.
本発明のアタッチメントは、中掘り装置を鋼管内側方向へガイド可能なガイド部と、鋼管類の頭部に接続される接続部とを有しており、注水口はガイド部に形成されている。このように注水口をガイド部に形成することで、注水される水はガイド部に沿って鋼管内に確実に注がれることになる。また、鋼管類に挿入すべき掘削装置をガイド部が鋼管内へ案内してくれるので、鋼管類への掘削装置の挿入作業が容易になる。 The attachment of the present invention has a guide part capable of guiding the inside digging device in the direction toward the inside of the steel pipe, and a connection part connected to the head of the steel pipe, and the water inlet is formed in the guide part. By forming the water injection port in the guide portion in this way, the water to be injected is surely poured into the steel pipe along the guide portion. Moreover, since the guide part guides the excavator to be inserted into the steel pipe into the steel pipe, the operation of inserting the excavator into the steel pipe is facilitated.
本発明のアタッチメントは、接続部をガイド部に対して相対回転可能に構成することも可能である。このような構成を採用した場合には、鋼管類の回転圧入を伴う施工（例えばケーシングチューブを回転圧入する硬質地盤用オールケーシング工）において、注水作業の間、鋼管類の回転圧入を中断する必要がない。すなわち、「回転圧入」と「中掘り」と「注水」のすべてを同時並行で進めることができるので、注水による施工時間の延長を回避できる。 The attachment of the present invention can also be configured such that the connection portion can be rotated relative to the guide portion. When such a configuration is adopted, it is necessary to interrupt the rotary press-fitting of the steel pipes during the water injection operation in construction involving the rotary press-fitting of the steel pipes (for example, the all-casing construction for hard ground in which the casing tube is rotary press-fitted). Absent. That is, since “rotary press-fitting”, “inner digging”, and “water injection” can all be performed simultaneously, it is possible to avoid the extension of construction time due to water injection.
本発明の注水構造は、鋼管類を圧入するとともに中掘りする際に利用され、掘削装置の昇降経路側へ突出しないように形成されている。このような構造により、鋼管類内側における掘削装置の昇降動作を妨げないので（すなわち中掘りの中断を招かないので）、鋼管類の中掘りと同時並行で鋼管類内側への注水を進めることが可能になる。この「注水構造」は、例えば上述したような、鋼管類とは別体のアタッチメントに形成した注水用開口部から構成されてもよく、或いは、鋼管類そのものに孔を開けて形成した注水用開口部から構成されてもよい。 The water injection structure of the present invention is used to press-fit steel pipes and dig in, and is formed so as not to protrude to the lifting path side of the excavator. Such a structure does not hinder the lifting and lowering operation of the excavator inside the steel pipes (that is, it does not cause interruption of the inside digging), so that water injection to the inside of the steel pipes can be promoted simultaneously with the inside digging of the steel pipes. It becomes possible. This “water injection structure” may be composed of, for example, a water injection opening formed in an attachment separate from the steel pipe as described above, or a water injection opening formed by making a hole in the steel pipe itself. You may comprise from a part.
本発明の鋼管類圧入方法では、鋼管類の圧入及び/又は中掘りと同時に、鋼管類の内側に注水するようになっている。このように、鋼管類の圧入及び/又は中掘りと同時に注水を進めることで、圧入や中掘りを中断することがなくなり、鋼管類の圧入を効率的に進めることができる。なお、鋼管類の圧入及び/又は中掘りと同時並行で注水を進めることができる限り、注水の具体的手段や構造は特に限定されず、例えば上述したアタッチメントを利用してもよく、或いは、鋼管類の側壁に開口部（注水口）を開けて、当該開口部を介して注水するようにしてもよい。鋼管類の注水口を開ける場合には、施工現場で鋼管類に孔を開けてもよく、或いは、鋼管類の製造現場で予め開口部を形成するようにしてもよい。 In the steel pipe press-fitting method of the present invention, water is poured into the steel pipes simultaneously with the press-fitting and / or digging of the steel pipes. In this way, by injecting water simultaneously with the press-fitting and / or digging of the steel pipes, the press-fitting and the digging are not interrupted, and the press-fitting of the steel pipes can be efficiently advanced. In addition, as long as water injection can proceed in parallel with the press-fitting and / or digging of steel pipes, the specific means and structure of water injection are not particularly limited. For example, the above-described attachment may be used, or the steel pipe An opening (water injection port) may be opened in a similar side wall, and water may be injected through the opening. When opening the water inlet for the steel pipes, a hole may be made in the steel pipes at the construction site, or an opening may be formed in advance at the steel pipe manufacturing site.
（鋼管類頭部アタッチメントの構成）
はじめに図１及び図２に基づいて、本発明の鋼管類頭部アタッチメントの具体的構成について説明する。
(Structure of steel pipe head attachment)
First, based on FIG.1 and FIG.2, the specific structure of the steel pipe head attachment of this invention is demonstrated.
鋼管類頭部アタッチメント１は、図１及び図２に示すような略ホッパー状あるいは略漏斗状の外観を有し、圧入する鋼管類（以下「鋼管」と略称）の頭部に対し着脱自在に接続して用いられ、掘削装置ガイドとしても機能する。施工時には、図２に示すように鋼管頭部に接続したままの状態で、鋼管類頭部アタッチメント１を介して中掘り装置を鋼管内に対し出し入れする。また、鋼管の圧入および中掘り掘削を進める過程では、必要に応じて、鋼管類頭部アタッチメント１に形成した送水口１６を介して、鋼管内に水を注水する。 The steel pipe head attachment 1 has a substantially hopper-like or substantially funnel-like appearance as shown in FIGS. 1 and 2, and is detachable from the head of a steel pipe to be press-fitted (hereinafter abbreviated as “steel pipe”). Used in connection, it also functions as a drilling equipment guide. At the time of construction, as shown in FIG. 2, the digging device is taken in and out of the steel pipe through the steel pipe head attachment 1 while being connected to the steel pipe head. Further, in the process of proceeding with the press-fitting of the steel pipe and the inside digging, water is poured into the steel pipe through the water supply port 16 formed in the steel pipe head attachment 1 as necessary.
この鋼管類頭部アタッチメント１（以下「アタッチメント」と称する）は、図１及び図２に示すように、主として、鋼管に着脱自在に接続される略円筒状の接続部１２と、挿入する中掘り装置を鋼管内側方向へガイドするガイド部１４と、鋼管内側方向へ注水するための注水口１６と、この注水口に外側から接続された注水管１８を有している。 As shown in FIGS. 1 and 2, the steel pipe head attachment 1 (hereinafter referred to as “attachment”) mainly includes a substantially cylindrical connecting portion 12 that is detachably connected to the steel pipe, and an insert that is inserted. It has the guide part 14 which guides an apparatus to a steel pipe inner direction, the water injection port 16 for pouring water to a steel pipe inner direction, and the water injection pipe 18 connected to this water injection port from the outer side.
接続部１２は、略円筒状の外観を有するように形成され、図２に示すように鋼管の頭部に対してアタッチメント１を着脱自在に接続して固定する役割を主に担っている。この円筒状接続部１２の上には、外観略すり鉢状のガイド部１４が固設されている。 The connection part 12 is formed so as to have a substantially cylindrical appearance, and mainly plays a role of removably connecting the attachment 1 to the head of the steel pipe as shown in FIG. On the cylindrical connection portion 12, a guide portion 14 having a substantially mortar-like appearance is fixed.
接続部１２と一体のガイド部１４は、図２に示すように断面が「逆ハの字形状」になるように形成され、中掘り用掘削装置（中掘り装置）を鋼管内側方向へガイドする斜面を内壁面側に有している。またこのガイド部１４は、底部に小径の開口部を有し、また上部に大径の開口部を有している。下開口部には円筒状接続部１２の上端が接続されており、上開口部は下開口部よりも大きな径を有している。中掘り装置を鋼管内に吊り降ろす際に、中掘り装置がガイド部１４の傾斜した内壁面に接触すると、その斜面に沿って中掘り装置が滑り落ちて降下し、鋼管内部へ誘導される。すなわちガイド部１４は、鋼管内に中掘り装置を挿入する際に、該中掘り装置を鋼管内へガイドする役割および鋼管類のジョイント部を保護する役割を主に担っている。 As shown in FIG. 2, the guide portion 14 integrated with the connecting portion 12 is formed so that the cross-section has an “inverted C shape”, and guides the digging device for digging (inner digging device) toward the inside of the steel pipe. It has a slope on the inner wall surface side. The guide portion 14 has a small-diameter opening at the bottom and a large-diameter opening at the top. The upper end of the cylindrical connecting portion 12 is connected to the lower opening, and the upper opening has a larger diameter than the lower opening. When the intermediate digging apparatus is suspended in the steel pipe, when the intermediate digging apparatus contacts the inclined inner wall surface of the guide portion 14, the intermediate digging apparatus slides down along the slope and is guided into the steel pipe. That is, the guide portion 14 mainly plays a role of guiding the inside digging device into the steel pipe and protecting a joint portion of the steel pipe when the inside digging device is inserted into the steel pipe.
なお、中掘り装置を鋼管内に挿入する際、ガイド部１４のすり鉢状内壁面には中掘り装置の先端側が頻繁に衝突することが想定されるため、図１(A)に示すように、ガイド部１４の外周には補強用のリブ２１が複数枚固設されている。各リブ２１は接続部１２とガイド部１４の継ぎ目を横断するように配設され、アタッチメント１の外周にほぼ等間隔で固設されている。 In addition, when inserting the digging device into the steel pipe, it is assumed that the tip side of the digging device frequently collides with the mortar-shaped inner wall surface of the guide portion 14, as shown in FIG. A plurality of reinforcing ribs 21 are fixed on the outer periphery of the guide portion 14. Each rib 21 is disposed so as to cross the joint between the connection portion 12 and the guide portion 14, and is fixed to the outer periphery of the attachment 1 at substantially equal intervals.
略すり鉢状のガイド部１４には、図１(B)の平面図に示すように、注水手段として機能する注水口１６（開口部）が形成されている。この注水口１６からなる注水手段は、図１(B)に示すようにアタッチメント内側（掘削装置の昇降経路側）に突出しない「非突出」の構造であるため、鋼管類内側を通る掘削装置の昇降動作を妨げない。 As shown in the plan view of FIG. 1B, the substantially mortar-shaped guide portion 14 is formed with a water injection port 16 (opening) that functions as water injection means. As shown in FIG. 1 (B), the water injection means comprising the water injection port 16 has a “non-projecting” structure that does not protrude to the inside of the attachment (the lifting path side of the drilling device). Does not interfere with the lifting operation.
そして上記注水口１６に連通するように、注水管１８がガイド部１４の外周面側から接続してある。注水管１８の一端は、図２に示すように注水口１６に接続した状態で固定されており、また、注水管１８の他端にある給水口１９には、図示しない送水ホースが接続されるようになっている。 A water injection pipe 18 is connected from the outer peripheral surface side of the guide portion 14 so as to communicate with the water injection port 16. One end of the water injection pipe 18 is fixed in a state of being connected to the water injection port 16 as shown in FIG. 2, and a water supply hose (not shown) is connected to the water supply port 19 at the other end of the water injection pipe 18. It is like that.
ガイド部１４の外周面と注水管１８との間には、図２に示すように、注水管補強用のリブ２３が固設されている。このリブ２３には、注水管１８に接続する送水ホースをワイヤ等で吊り下げることができるように、貫通孔２４が形成してある。 As shown in FIG. 2, a rib 23 for reinforcing the water injection pipe is fixed between the outer peripheral surface of the guide portion 14 and the water injection pipe 18. The rib 23 is formed with a through hole 24 so that a water supply hose connected to the water injection pipe 18 can be suspended by a wire or the like.
上記構成のアタッチメント１を介して鋼管内に注水する際には、例えば図３に示すような注水システムを用いる。この注水システムは、耐摩耗性の送水ホース２５と、該送水ホースの途中に設けられたボールバルブ２６（流量調整手段）と、送水ポンプ２７（サンドポンプ）とを含んで構成される。送水ホース２５の一端はアタッチメント１の注水管１８に接続されており、また、その逆側の他端は送水ポンプ２７に接続されている。 When water is poured into the steel pipe through the attachment 1 having the above-described configuration, for example, a water injection system as shown in FIG. 3 is used. This water injection system includes an abrasion-resistant water supply hose 25, a ball valve 26 (flow rate adjusting means) provided in the middle of the water supply hose, and a water supply pump 27 (sand pump). One end of the water supply hose 25 is connected to the water injection pipe 18 of the attachment 1, and the other end on the opposite side is connected to the water supply pump 27.
注水管１８に接続した状態で送水ホース２５が抜け落ちないように、図３に示すように、該送水ホースの一端側は、アタッチメント１のリブ２３に吊り下げられている。送水ホース２５の途中にボールバルブ２６を介在させることで、注水時においてその流量を微調整することが可能になる。なお、このようなバルブを設けることなく、送水ポンプのON/OFFだけで注水操作を実施するようにしてもよい。 As shown in FIG. 3, one end side of the water supply hose is suspended from the rib 23 of the attachment 1 so that the water supply hose 25 does not fall out while being connected to the water injection pipe 18. By interposing the ball valve 26 in the middle of the water supply hose 25, the flow rate can be finely adjusted at the time of water injection. In addition, you may make it implement water injection operation only by ON / OFF of a water pump, without providing such a valve | bulb.
（アタッチメントを用いた鋼管矢板の打設）
次に、鋼管類の一例として鋼管矢板を挙げて、上記構成のアタッチメントを用いた鋼管矢板打設工について説明する。図４〜図６を参照する。
(Punching of steel sheet piles using attachments)
Next, a steel pipe sheet pile will be described as an example of steel pipes, and a steel pipe sheet pile placing work using the attachment having the above configuration will be described. Reference is made to FIGS.
鋼管矢板の打設にあたっては、はじめに図４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. 4, 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.
なお、打設する鋼管矢板５の頭部には、上述したアタッチメント１を図２及び図４に示すように装着しておく。このアタッチメント１の内側スペースは、鋼管矢板本管５１の内側に連通している。アタッチメント１の注水管１８には、図４に示すように送水ホース２５を接続し、さらに当該送水ホース２５の一端には送水ポンプ２７（水中ポンプ）を接続する。注水管１８に接続した送水ホース２５は、ワイヤ等を介してリブ２３に吊り下げるようにする。 In addition, the attachment 1 mentioned above is mounted | worn with the head of the steel pipe sheet pile 5 to lay as shown in FIG.2 and FIG.4. The inner space of the attachment 1 communicates with the inner side of the steel pipe sheet pile main pipe 51. As shown in FIG. 4, a water supply hose 25 is connected to the water injection pipe 18 of the attachment 1, and a water supply pump 27 (submersible pump) is connected to one end of the water supply hose 25. The water supply hose 25 connected to the water injection pipe 18 is suspended from the rib 23 via a wire or the like.
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、図５に示すように中掘り装置８を併用して本管５１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、少なくとも鋼管矢板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。 In the initial stage of steel pipe sheet pile press-fitting, press-fitting is carried out only by the press-fitting device 3, and when the press-fitting proceeds by a certain amount and the earth and sand enters the main pipe 51 and the penetration resistance increases, the digging device 8 as shown in FIG. And excavating the earth and sand in the main pipe 51. 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 steel pipe sheet pile main pipe is eliminated or alleviated, so that a certain reduction in penetration resistance can be expected.
中掘り装置８を本管５１内に挿入する際には、中掘り装置８の先端側がガイド部１４に接触することもあるが、その傾斜した内壁面によって中掘り装置８は、本管内側方向へ誘導されるので、中掘り装置８を簡単かつ確実に鋼管矢板本管内に挿入できる。なお、ガイド部１４に形成した注水口１６（開口部）は、図２に示すように、ガイド部１４の内側に突出しない「非突出タイプ」の注水手段であるので、この注水口１６が中掘り装置８の出し入れの妨げになることはない。 When the intermediate digging device 8 is inserted into the main pipe 51, the tip side of the intermediate digging device 8 may come into contact with the guide portion 14, but the inclined inner wall surface causes the intermediate digging device 8 to move in the main pipe inner direction. Therefore, the digging device 8 can be easily and reliably inserted into the steel pipe sheet pile main pipe. The water injection port 16 (opening) formed in the guide portion 14 is a “non-projecting type” water injection means that does not protrude inside the guide portion 14 as shown in FIG. There is no hindrance to taking in and out the digging device 8.
このように圧入装置３と中掘り装置８を併用して打設を進めると、図１２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 shown in FIG. 12, when the press-fitting device 3 and the digging device 8 are used together, fine sand, gravel, and the like are inevitably mixed in 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、圧入装置３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５２，５３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、送水ポンプ２７を作動させ、図６に示すように、アタッチメント１の注水口１６を介して本管５１内への注水を開始する。 Therefore, the hydraulic pressure gauge of the press-fitting device 3 is monitored to grasp the penetration resistance, and when the penetration resistance exceeds an allowable level, the joint portions 52 and 53 are clogged (clogging that greatly hinders the press-fitting). It is determined that the water pump 27 is operated, and water injection into the main pipe 51 is started through the water injection port 16 of the attachment 1 as shown in FIG.
注水工程では、送水ポンプ２７から送られる水が送水ホース２５，注水管１８を介して注水口１６へ送られ、更に、注水口１６から排出された水は、ガイド部１４及び接続部１２の内側を通って本管５１内へ注がれる。このように、アタッチメント１は掘削装置をガイドする機能とともに、鋼管内へ注水する機能も備えている。 In the water injection process, water sent from the water supply pump 27 is sent to the water injection port 16 via the water supply hose 25 and the water injection pipe 18, and the water discharged from the water injection port 16 is inside the guide portion 14 and the connection portion 12. And is poured into the main pipe 51. As described above, the attachment 1 has a function of guiding water into the steel pipe as well as a function of guiding the excavator.
アタッチメント１を介して本管５１内に送水された水は、図６に示すように本管内に貯水され、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、鋼管類外部の水との間に水頭差Δｈが確保・維持され、必要な水頭圧が確保されるように、本管内に注水し、必要に応じて注水を繰り返す。 The water fed into the main pipe 51 via the attachment 1 is stored in the main pipe as shown in FIG. 6 and mainly pressurizes the vicinity of the lower end of the steel pipe sheet pile and the surrounding earth and sand by the hydraulic head pressure, and the water in the joint section. It plays a role of pressurizing the clogged portion (the earth and sand consolidated in the joint portion) with the water head pressure. Therefore, the water head difference Δh is secured and maintained with the water outside the steel pipes, and water is poured into the main pipe so that the necessary water head pressure is secured, and water injection is repeated as necessary.
このように本管５１内に注水された水の圧力（水頭圧）は、本管下方の内側および外側に沿って伝搬し、更には継手部５２，５３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の塊をほぐすとともに上方へ押し出す方向に作用して、目詰まり解消に大きく貢献する。 Thus, the pressure (water head pressure) of the water poured into the main pipe 51 propagates along the inner side and the outer side below the main pipe, and further propagates into the inner space of the joint portions 52 and 53. This propagating pressure acts in the direction of loosening the lump of earth and sand that causes clogging in the joint portion and pushing it upward, greatly contributing to the elimination of clogging.
以後、必要に応じて注水を繰り返して本管５１内に貯水された状態を維持しながら、圧入装置３と中掘り装置８を併用して鋼管矢板５の打設を進める。その過程で継手部５２，５３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（図１３に示すような継手部５２，５３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, the steel pipe sheet pile 5 is driven using both the press-fitting device 3 and the digging device 8 while maintaining the state where the water is stored in the main pipe 51 by repeating water injection as necessary. During the process, clogging of earth and sand accompanying the progress of press-fitting and elimination of clogging due to water head pressure (ejection from the upper ends of the joints 52 and 53 as shown in FIG. 13) are repeated in the joints 52 and 53. In each case, the penetration resistance increased with the progress of press-fitting is alleviated at once, and the subsequent press-fitting device enables static press-fitting.
（鋼管類の圧入でアタッチメントを用いるメリット）
上述した本発明のアタッチメントによれば、鋼管類へ注水するたびに、注水管の設置と取外しを繰り返す必要がないので、鋼管類への注水作業を省力で行うことができる。
(Advantages of using attachments for press fitting of steel pipes)
According to the above-described attachment of the present invention, it is not necessary to repeat the installation and removal of the water injection pipe every time water is poured into the steel pipe, so that the water injection work to the steel pipe can be performed with labor saving.
また、本発明のアタッチメントは、掘削装置のガイド機能および鋼管類上端のジョイント部の保護機能とともに注水機能（掘削装置の出し入れを妨げない注水手段）も備えているので、鋼管類への注水と同時に、中掘り用の掘削装置を出し入れできる。したがって、圧入工程・中掘り工程と同時並行で、鋼管類への注水を進めることができるので、注水による施工時間の延長を招くことがない。 In addition, the attachment of the present invention has a water injection function (a water injection means that does not prevent the excavator from being taken in and out) as well as a guide function of the excavator and a protection function of the joint at the upper end of the steel pipe. , Drilling equipment for medium digging can be taken in and out. Therefore, water injection into the steel pipes can be performed simultaneously with the press-fitting process and the underground digging process, so that the construction time due to the water injection is not extended.
また、本発明のアタッチメントは、中掘り装置を鋼管内側方向へガイド可能なガイド部と、鋼管類の頭部に接続される接続部とを有しており、注水口はガイド部に形成されている。このように注水口をガイド部に形成することで、注水される水はガイド部に沿って鋼管内に確実に注がれることになる。また、鋼管類に挿入すべき掘削装置をガイド部が鋼管内へ案内してくれるので、鋼管類への掘削装置の挿入作業が容易になる。 Further, the attachment of the present invention has a guide part capable of guiding the inside digging device in the steel pipe inner direction, and a connection part connected to the head part of the steel pipes, and the water inlet is formed in the guide part. Yes. By forming the water injection port in the guide portion in this way, the water to be injected is surely poured into the steel pipe along the guide portion. Moreover, since the guide part guides the excavator to be inserted into the steel pipe into the steel pipe, the operation of inserting the excavator into the steel pipe is facilitated.
（アタッチメントの第２実施形態）
次に、図７及び図８に基づいて、第２実施形態のアタッチメントについて説明する。
(Second Embodiment of Attachment)
Next, the attachment of 2nd Embodiment is demonstrated based on FIG.7 and FIG.8.
第２実施形態のアタッチメント２では、図７に示すように、ガイド部１４がスイベル１３を介して接続部１２に連結されており、そのため、接続部１２はガイド部１４に対して相対回転できるようになっている。このように、接続部１２が相対回転可能に設けられている点において、前述した第１実施形態と相違する。なお、ガイド部１４と接続部１２の機能そのものは、第１実施形態と同様である。またこのように相対回転させても、ガイド部１４と接続部１２のそれぞれの機能は失われない。 In the attachment 2 of the second embodiment, as shown in FIG. 7, the guide portion 14 is coupled to the connection portion 12 via the swivel 13, so that the connection portion 12 can rotate relative to the guide portion 14. It has become. As described above, the connection portion 12 is provided so as to be relatively rotatable, which is different from the first embodiment described above. In addition, the function itself of the guide part 14 and the connection part 12 is the same as that of 1st Embodiment. Moreover, even if it carries out relative rotation in this way, each function of the guide part 14 and the connection part 12 is not lost.
この第２実施形態のアタッチメント２は、例えば図８に示すように、水底地盤にケーシングチューブ６１を回転圧入するとともに、その内側を中掘りする施工において、ケーシングチューブ６１の頭部に着脱自在に接続して用いることが可能である。アタッチメント２の注水管１８には、前記第１実施形態と同様に、送水ホース２５を接続し、さらに当該送水ホースの一端には送水ポンプ２７を接続する。 The attachment 2 of the second embodiment is detachably connected to the head of the casing tube 61 in a construction in which, for example, as shown in FIG. Can be used. As in the first embodiment, a water supply hose 25 is connected to the water injection pipe 18 of the attachment 2, and a water supply pump 27 is connected to one end of the water supply hose.
図８の施工態様において、ケーシングチューブ６１は回転圧入装置７によって、回転を伴いながら地盤に圧入される。一方、チューブ頭部に接続されたアタッチメント２のガイド部１４は、ワイヤ２９によって地盤に連結されており、ガイド部１４の共回り（ケーシングチューブの回転に伴う共回り）を阻止している。 In the construction mode of FIG. 8, the casing tube 61 is press-fitted into the ground with rotation by the rotary press-fitting device 7. On the other hand, the guide part 14 of the attachment 2 connected to the tube head is coupled to the ground by a wire 29, and prevents the guide part 14 from rotating together (corotating along with the rotation of the casing tube).
このように、ガイド部１４の回転が阻止される一方で、その下の接続部１２はケーシングチューブ６１と一体回転するので、回転圧入時にアタッチメント２から送水ホース２５が外れることがない。したがって、ケーシングチューブ６１を回転圧入しながら、同時に、アタッチメント２を介してケーシング内へ注水を行うことができる。そして、外部との間に一定量の水頭差が確保されるように注水することで、ボイリングを抑制できる。 Thus, while the rotation of the guide portion 14 is prevented, the connection portion 12 therebelow rotates integrally with the casing tube 61, so that the water supply hose 25 is not detached from the attachment 2 at the time of rotational press-fitting. Therefore, water can be poured into the casing via the attachment 2 at the same time as the casing tube 61 is rotationally press-fitted. And boiling can be suppressed by pouring water so that a fixed amount of head difference may be secured between the outside.
したがって本発明を、鋼管類の回転圧入を伴う施工に採用することで、「回転圧入」と「中掘り」と「鋼管内への注水」のそれぞれを同時並行で進めることができるといった格別の効果が達成される。 Therefore, by adopting the present invention for construction involving rotational press-fitting of steel pipes, it is possible to proceed with each of “rotary press-fitting”, “inner digging” and “water injection into steel pipes” simultaneously in parallel. Is achieved.
（鋼管類そのものに注水構造を持たせる実施形態）
上述した実施形態では、鋼管とは別体のアタッチメントを鋼管頭部に接続して注水していたが、このようなアタッチメントを用いる代わりに、鋼管そのものに注水手段を具備させて注水するようにしてもよい。
(Embodiment in which the steel pipe itself has a water injection structure)
In the above-described embodiment, an attachment separate from the steel pipe is connected to the steel pipe head for water injection, but instead of using such an attachment, the steel pipe itself is provided with water injection means for water injection. Also good.
例えば図９に示すように、鋼管矢板５の打設において、鋼管矢板本管５１の上端側の側壁に開口部５５（注水手段として機能する開口部）を形成し、該開口部に注水管１８を接続して注水するようにする。開口部５５に注水管１８を接続する際には、その先端部が、鋼管矢板本管５１の内側に突き出ないようにすることが好ましい。このような開口部５５の形成は、施工現場で鋼管矢板本管の上端側に形成してもよく、或いは、鋼管矢板の製造現場で予め形成するようにしてもよい。 For example, as shown in FIG. 9, in placing the steel pipe sheet pile 5, an opening 55 (opening functioning as water injection means) is formed in the side wall on the upper end side of the steel pipe sheet pile main pipe 51, and the water injection pipe 18 is formed in the opening. Connect and pour water. When the water injection pipe 18 is connected to the opening 55, it is preferable that the tip end thereof does not protrude inside the steel pipe sheet pile main pipe 51. Such an opening 55 may be formed on the upper end side of the steel pipe sheet pile main at the construction site, or may be formed in advance at the manufacturing site of the steel pipe sheet pile.
なお、鋼管矢板５に他の鋼管矢板を継ぎ足して圧入する場合にも、同様に、新たに継ぎ足した鋼管矢板本管の側壁に開口部を形成して、該開口部を介して注水する。 In addition, when adding another steel pipe sheet pile to the steel pipe sheet pile 5 and press-fitting, similarly, an opening part is formed in the side wall of the newly added steel pipe sheet pile main pipe, and water is injected through the opening part.
このように、鋼管矢板本管上端の側壁に孔を開けて、その開口部から注水する方法であれば、掘削装置の昇降経路側へ注水構造が突き出ることがないので、中掘りと同時並行で注水を進めることができる。 In this way, if a hole is made in the side wall of the upper end of the steel pipe sheet pile main and water is injected from the opening, the water injection structure does not protrude to the lifting path side of the excavator, Water injection can proceed.
（その他）
上述した実施形態では、鋼管類の代表例として鋼管矢板やケーシングチューブを挙げたが、本発明を適用可能な鋼管類は必ずしもこれらに限定されない。例えば、仮橋・仮桟橋工における鋼管杭の打設などにも本発明を適用することができる。
(Other)
In the above-described embodiment, steel pipe sheet piles and casing tubes are given as representative examples of steel pipes, but steel pipes to which the present invention can be applied are not necessarily limited thereto. For example, the present invention can also be applied to placing steel pipe piles in temporary bridges and temporary piers.
また本発明とともに併用する掘削装置は、図示するようなオーガースクリュー付きの回転駆動式掘削装置に限定されるものではなく、鋼管に対して出し入れ自在のあらゆる掘削装置、例えばハンマーグラブのガイドに用いることができる。 The excavator used together with the present invention is not limited to the rotary drive excavator with an auger screw as shown in the figure, but can be used for any excavator that can be inserted into and removed from a steel pipe, for example, a hammer grab guide. Can do.
また、鋼管類の圧入時又は打設時に利用する注水手段の構成は、圧入や中掘りの中断を招くものでなければ（すなわち、圧入及び/又は中掘りを妨げず同時並行で注水できるものであれば）特に限定されず、いかなる構造であっても採用可能できる。 In addition, the structure of the water injection means used at the time of press-fitting or placing of steel pipes should not cause interruption of the press-fitting and / or digging (that is, it can be poured simultaneously without interfering with the press-fitting and / or digging). If there is no particular limitation, any structure can be adopted.
１ 鋼管類頭部アタッチメント（掘削装置ガイド／掘削装置誘導器具）
２ 鋼管類頭部アタッチメント（掘削装置ガイド／掘削装置誘導器具）
３ 鋼管矢板圧入装置（鋼管類圧入装置）
５ 鋼管矢板（鋼管類）
５’ 鋼管矢板（鋼管類）
７ 回転圧入装置
８ 中掘り装置（中掘り用の掘削装置）
１２ 接続部
１３ スイベル
１４ ガイド部
１６ 注水口（注水手段）
１８ 注水管
１９ 給水口
２１ リブ
２３ リブ
２４ 貫通孔
２５ 送水ホース
２６ ボールバルブ（流量調整手段）
２７ 送水ポンプ（水中ポンプ／サンドポンプ）
２９ ワイヤ
３４ クランプ
３８ チャック
５１ 本管
５１’ 本管
５２ 継手部
５２’ 継手部
５３ 継手部
５３’ 継手部
５５ 開口部（注水口／注水手段）
６１ ケーシングチューブ（鋼管類）
1 Steel pipe head attachment (excavator guide / excavator guide)
2 Steel pipe head attachment (excavator guide / excavator guide)
3 Steel pipe sheet pile press-in device (steel pipe press-in device)
5 Steel pipe sheet pile (steel pipes)
5 'Steel pipe sheet pile (steel pipes)
7 Rotary press-fitting device 8 Medium digging device (Excavation device for medium digging)
12 connection part 13 swivel 14 guide part 16 water inlet (water injection means)
18 Water supply pipe 19 Water supply port 21 Rib 23 Rib 24 Through hole 25 Water supply hose 26 Ball valve (flow rate adjusting means)
27 Water pump (submersible pump / sand pump)
29 Wire 34 Clamp 38 Chuck 51 Main pipe 51 ′ Main pipe 52 Joint part 52 ′ Joint part 53 Joint part 53 ′ Joint part 55 Opening part (water inlet / water injection means)
61 Casing tube (steel pipes)
Claims (9)
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| JP2013059169A JP6216526B2 (en) | 2013-03-21 | 2013-03-21 | Steel pipe head attachment |
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| JP2013059169A JP6216526B2 (en) | 2013-03-21 | 2013-03-21 | Steel pipe head attachment |
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| JP6216526B2 JP6216526B2 (en) | 2017-10-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018159191A (en) * | 2017-03-22 | 2018-10-11 | 日本ベース株式会社 | Embedment method of tubular body |
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