JP6808084B1 - Pile pulling method - Google Patents

Pile pulling method Download PDF

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JP6808084B1
JP6808084B1 JP2020095431A JP2020095431A JP6808084B1 JP 6808084 B1 JP6808084 B1 JP 6808084B1 JP 2020095431 A JP2020095431 A JP 2020095431A JP 2020095431 A JP2020095431 A JP 2020095431A JP 6808084 B1 JP6808084 B1 JP 6808084B1
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藤井　健之
健之 藤井
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健之 藤井
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Abstract

【課題】地盤中の既設杭を確実に除去することが可能な杭抜き方法を提供する。【解決手段】下端に掘削刃１が環状に配置された円筒状のケーシング２をその軸周りに回転させて、掘削刃１によって地盤Ｇに埋設された既設杭Ｐの周囲を掘削し、地盤Ｇと既設杭Ｐとの間の縁が切れた縁切り部３を形成した上でケーシング２を地盤Ｇから一旦引き抜く縁切り工程と、ケーシング２の下端に既設杭Ｐに巻き付ける巻き付け用ワイヤ５を仮止めした上で、ケーシング２を縁切り部３内に再挿入するワイヤ挿入工程と、ケーシング２を軸周りに回転させて仮止めされた巻き付け用ワイヤ５をケーシング２から脱落させ、巻き付け用ワイヤ５が既設杭Ｐに巻き付けられた状態とするワイヤ巻き付け工程と、巻き付け用ワイヤ５を上向きに引き上げて、既設杭Ｐを地盤Ｇから引き抜く引き抜き工程と、を有する構成とする。【選択図】図１PROBLEM TO BE SOLVED: To provide a pile pulling method capable of surely removing an existing pile in the ground. SOLUTION: A cylindrical casing 2 in which an excavation blade 1 is arranged in an annular shape at a lower end is rotated around an axis thereof, and excavation is performed around an existing pile P buried in the ground G by the excavation blade 1, and the ground G is excavated. An edge cutting step of temporarily pulling out the casing 2 from the ground G after forming an edge cutting portion 3 having a cut edge between the existing pile P and the existing pile P, and a winding wire 5 to be wound around the existing pile P are temporarily fixed to the lower end of the casing 2. Above, in the wire insertion step of reinserting the casing 2 into the edge cutting portion 3, the winding wire 5 temporarily fixed by rotating the casing 2 around the axis is dropped from the casing 2, and the winding wire 5 is an existing pile. The configuration includes a wire winding step in which the pile is wound around P, and a pulling step in which the winding wire 5 is pulled upward and the existing pile P is pulled out from the ground G. [Selection diagram] Fig. 1

Description

この発明は、地盤中の既設杭を引き抜くための杭抜き方法に関する。 The present invention relates to a pile pulling method for pulling out an existing pile in the ground.

ビルやマンション等の建物の建設現場においては、地盤中の硬い層まで杭が埋設され、この杭によって建物が安定的に支持される。そして、建物の建て替え時においては、この建物を支持していた既設杭（地盤に埋設された状態の杭）も併せて撤去される。 At construction sites of buildings such as buildings and condominiums, piles are buried up to the hard layer in the ground, and the piles stably support the building. When the building is rebuilt, the existing piles (pile buried in the ground) that supported the building are also removed.

既設杭を撤去するための一般的な方法として、例えば特許文献１に示す輪投げ工法がある。この輪投げ工法においては、まず、最下端に掘削刃を有する円筒状のケーシング４をその軸周りに回転しながら既設杭Ｐの周囲に埋め込んだ後にこのケーシング４を一旦引き抜き、地盤と既設杭Ｐとの間の縁切りが行われる。次に、ケーシング４の最下端にワイヤ９を掛けて再度地中に埋め込んで、ワイヤ９の先端を既設杭Ｐに引っ掛ける。そして、ワイヤ９の一方端を既設杭Ｐに引っ掛けたままケーシング４を引き抜き、さらに、ワイヤ９の他端を上方に引っ張って既設杭Ｐを引き抜く（特許文献１の段落００３１〜００３７、図３、図４等参照）。 As a general method for removing an existing pile, for example, there is a quoits method shown in Patent Document 1. In this quoits method, first, a cylindrical casing 4 having an excavation blade at the lowermost end is embedded around the existing pile P while rotating around its axis, and then the casing 4 is once pulled out to form the ground and the existing pile P. A stake is made between them. Next, the wire 9 is hung on the lowermost end of the casing 4 and embedded in the ground again, and the tip of the wire 9 is hooked on the existing pile P. Then, the casing 4 is pulled out while one end of the wire 9 is hooked on the existing pile P, and the other end of the wire 9 is pulled upward to pull out the existing pile P (paragraphs 0031 to 0037 of Patent Document 1, FIG. 3, FIG. See Fig. 4 etc.).

特開２０１９−２１０６９５号公報JP-A-2019-210695

上記の特許文献１に係る杭抜き方法によると、ワイヤ９を掛けたケーシング４を再度地中に埋め込む際に、ワイヤ９が緩んでケーシング４の下端から脱落しやすい。このため、既設杭Ｐの所望の位置にワイヤ９を掛けるのは難しく、作業が比較的容易な既設杭Ｐの上端近傍にワイヤ９を引っ掛けることが多い（特許文献１の図４（ｃ）参照）。この場合、中折れ、破損、ジョイント不良等が生じた不健全な既設杭Ｐにおいては、一度の引き抜き作業でこの既設杭Ｐの全体を撤去することができず、その引き抜き作業を複数回に分けて行う必要があり、その作業が煩雑となるとともにコスト高となる問題がある。 According to the pile pulling method according to Patent Document 1, when the casing 4 on which the wire 9 is hung is embedded in the ground again, the wire 9 is loosened and easily falls off from the lower end of the casing 4. For this reason, it is difficult to hook the wire 9 at a desired position of the existing pile P, and the wire 9 is often hooked near the upper end of the existing pile P, which is relatively easy to work with (see FIG. 4 (c) of Patent Document 1). ). In this case, in the case of an unhealthy existing pile P that is broken, damaged, or has a joint defect, the entire existing pile P cannot be removed by one pulling operation, and the pulling work is divided into a plurality of times. There is a problem that the work becomes complicated and the cost becomes high.

そこで、この発明は、地盤中の既設杭を簡便かつ確実に除去することを課題とする。 Therefore, an object of the present invention is to easily and surely remove existing piles in the ground.

上記の課題を解決するため、この発明においては、
下端に掘削刃が環状に配置された円筒状のケーシングをその軸周りに回転させて、前記掘削刃によって地盤に埋設された既設杭の周囲を掘削し、前記地盤と前記既設杭との間の縁が切れた縁切り部を形成した上で前記ケーシングを前記地盤から一旦引き抜く縁切り工程と、
前記ケーシングの下端に前記既設杭に巻き付ける巻き付け用ワイヤを仮止めした上で、前記ケーシングを前記縁切り部内に再挿入するワイヤ挿入工程と、
前記ケーシングを軸周りに回転させて仮止めされた前記巻き付け用ワイヤを前記ケーシングから脱落させ、前記巻き付け用ワイヤが前記既設杭に巻き付けられた状態とするワイヤ巻き付け工程と、
前記巻き付け用ワイヤを上向きに引き上げて、前記既設杭を前記地盤から引き抜く引き抜き工程と、
を有する杭抜き方法を構成した。 In order to solve the above problems, in the present invention,
A cylindrical casing in which a drilling blade is arranged in a ring shape at the lower end is rotated around its axis to excavate around an existing pile buried in the ground by the drilling blade, and between the ground and the existing pile. An edge cutting step in which the casing is once pulled out from the ground after forming an edge cutting portion having a cut edge.
A wire insertion step of temporarily fixing a winding wire to be wound around the existing pile to the lower end of the casing and then reinserting the casing into the edge cutting portion.
A wire winding step of rotating the casing around an axis to temporarily fix the winding wire to fall off from the casing so that the winding wire is wound around the existing pile.
A pulling step of pulling up the winding wire upward and pulling out the existing pile from the ground.
The pile pulling method having the above was constructed.

このようにすると、仮止めされた巻き付け用ワイヤをケーシングの回転によって脱落させることで、既設杭への巻き付け用ワイヤの巻き付け位置を制御することができる。このため、例えば、既設杭が中折れしている場合は、その中折れしている部分よりも下側の既設杭に巻き付け用ワイヤを巻き付けて引き上げることにより、巻き付け位置よりも上側にある中折れしている部分も同時に引き抜くことができる。このため、一度の引き抜き作業によって、地盤中の既設杭を簡便かつ確実に除去することができる。 In this way, the temporarily fixed winding wire is dropped off by the rotation of the casing, so that the winding position of the winding wire around the existing pile can be controlled. Therefore, for example, when the existing pile is bent in the middle, the winding wire is wound around the existing pile below the folded portion and pulled up, so that the existing pile is broken in the middle above the winding position. The part that is being used can be pulled out at the same time. Therefore, the existing piles in the ground can be easily and surely removed by one pulling operation.

前記構成においては、
前記ケーシングの下端に取り付けられた結束部材によって、前記巻き付け用ワイヤが仮止めされており、前記ケーシングの軸周りの回転によって前記結束部材が切断されることによって、前記巻き付け用ワイヤが前記ケーシングから脱落する構成とするのが好ましい。 In the above configuration,
The winding wire is temporarily fixed by a binding member attached to the lower end of the casing, and the binding member is cut by rotation around the axis of the casing, so that the winding wire falls off from the casing. It is preferable that the configuration is as follows.

このようにすると、結束部材によって巻き付け用ワイヤを安定的に仮止めすることができるため、ワイヤ挿入工程において所望の深さ（既設杭の所望の長さ方向位置）に到達する前に、この巻き付け用ワイヤが不用意に脱落するのを防止することができる。その一方で、ケーシングを軸周りに回転して結束部材を切断することによって、その所望の深さにおいて巻き付け用ワイヤをスムーズに脱落させることができる。 In this way, the winding wire can be stably temporarily fixed by the binding member, so that the winding wire is wound before reaching a desired depth (a desired length direction position of the existing pile) in the wire insertion step. It is possible to prevent the wire for being inadvertently dropped off. On the other hand, by rotating the casing around the axis to cut the binding member, the winding wire can be smoothly dropped off at the desired depth.

結束部材によって巻き付け用ワイヤを仮止めする構成においては、
前記ワイヤ挿入工程の前に、前記ケーシングの下端部に着脱自在の保持部材を取り付けた上で、前記保持部材によって前記巻き付け用ワイヤを保持させ、その保持状態において前記結束部材で前記巻き付け用ワイヤの仮止めを行い、この仮止め後に前記保持部材を前記ケーシングから取り外すワイヤ仮止め工程を有する構成とするのが好ましい。 In the configuration where the winding wire is temporarily fixed by the binding member,
Prior to the wire insertion step, a detachable holding member is attached to the lower end of the casing, the winding wire is held by the holding member, and in the holding state, the winding wire is held by the binding member. It is preferable that the structure includes a wire temporary fixing step of temporarily fixing the holding member and then removing the holding member from the casing after the temporary fixing.

このようにすると、結束部材による仮止めの際に、手で巻き付け用ワイヤを保持しておく必要がないため、その仮止め作業を作業者一人で容易に行うことができ、高い作業効率を確保することができる。 In this way, since it is not necessary to hold the winding wire by hand when temporarily fixing with the binding member, the temporary fixing work can be easily performed by one operator, and high work efficiency is ensured. can do.

ワイヤ仮止め工程を有する構成においては、
前記保持部材に磁石が設けられており、前記磁石の磁力によって、前記保持部材を磁性材料からなる前記ケーシングに対し着脱自在とした構成とするのが好ましい。 In a configuration having a wire temporary fixing process,
It is preferable that the holding member is provided with a magnet, and the holding member is detachably attached to the casing made of a magnetic material by the magnetic force of the magnet.

このようにすると、ケーシングへの保持部材の着脱作業をスムーズに行うことができ、作業効率を一層高めることができる。 In this way, the work of attaching and detaching the holding member to and from the casing can be smoothly performed, and the work efficiency can be further improved.

前記各構成においては、
前記巻き付け用ワイヤが、前記ケーシングの下端に周方向に所定間隔で環状に配置された前記掘削刃に沿うように前記ケーシングに仮止めされている構成とするのが好ましい。 In each of the above configurations,
It is preferable that the winding wire is temporarily fixed to the casing so as to be along the excavation blade which is annularly arranged at a predetermined interval in the circumferential direction at the lower end of the casing.

このようにすると、ケーシングの下端の掘削刃によって縁切り部内の土砂（泥水）がスムーズにかき分けられ、挿入に伴う圧力が巻き付け用ワイヤに直接作用しにくい。このため、その挿入の際に、環状に束ねた巻き付け用ワイヤが径方向外側に拡径してばらけた状態となるのを防止して、既設杭の所定位置に巻き付け用ワイヤを確実に巻き付けることができる。 In this way, the excavation blade at the lower end of the casing smoothly separates the earth and sand (muddy water) in the edge cutting portion, and the pressure associated with the insertion is unlikely to act directly on the winding wire. Therefore, at the time of insertion, the winding wire bundled in an annular shape is prevented from expanding in diameter outward in the radial direction and becoming loose, and the winding wire is surely wound around a predetermined position of the existing pile. Can be done.

この発明は、上記のように、ケーシングに仮止めされた巻き付け用ワイヤを、所定の位置でケーシングから脱落させて既設杭に巻き付けるので、中折れ等が生じた不健全な既設杭についても簡便かつ確実に除去することができる。 In the present invention, as described above, the winding wire temporarily fixed to the casing is dropped from the casing at a predetermined position and wound around the existing pile. Therefore, it is easy to handle an unhealthy existing pile in which a center fold or the like occurs. It can be reliably removed.

この発明に係る杭抜き方法の工程を示す断面図（一部は部分断面図）であって、（ａ）は既設杭が地盤に埋設された状態、（ｂ）はケーシングで縁切り部を形成した状態、（ｃ）はケーシングを一旦引き抜いた状態、（ｄ）は巻き付け用ワイヤを仮止めしたケーシングを再挿入した状態、（ｅ）は巻き付け用ワイヤをケーシングから脱落させて既設杭に巻き付けた状態、（ｆ）はケーシングを再び引き抜いた状態、（ｇ）は既設杭を引き抜いている状態It is a cross-sectional view (partially a partial cross-sectional view) which shows the process of the pile pulling method which concerns on this invention, (a) is a state in which an existing pile is buried in the ground, and (b) is the edge cutting part formed by a casing. The state, (c) is the state in which the casing is once pulled out, (d) is the state in which the casing in which the winding wire is temporarily fixed is reinserted, and (e) is the state in which the winding wire is dropped from the casing and wound around the existing pile. , (F) is the state where the casing is pulled out again, and (g) is the state where the existing pile is pulled out. ワイヤ仮止め工程の手順を示す断面図であって、（ａ）はケーシングに保持部材を取り付けて巻き付け用ワイヤを保持した状態、（ｂ）は結束部材によって巻き付け用ワイヤを仮止めした状態、（ｃ）はケーシングから保持部材を取り外した状態It is sectional drawing which shows the procedure of the wire temporary fixing process, (a) is a state which held the winding wire by attaching a holding member to a casing, (b) is a state which the winding wire is temporarily fixed by a binding member, ( c) is a state in which the holding member is removed from the casing. 図２（ｃ）の状態における要部を示す断面図であって、（ａ）は掘削刃の直下に巻き付け用ワイヤを配置した状態、（ｂ）は掘削刃のサイドに巻き付け用ワイヤを配置した状態2A is a cross-sectional view showing a main part in the state of FIG. 2C, in which FIG. 2A is a state in which a winding wire is arranged directly under the excavation blade, and FIG. 2B is a state in which a winding wire is arranged on the side of the excavation blade. State 既設杭の根固め部に巻き付け用ワイヤを巻き付けた状態を示す要部の部分断面図Partial cross-sectional view of the main part showing the state where the winding wire is wound around the root consolidation part of the existing pile.

この発明に係る杭抜き方法を図１から図４に基づいて説明する。この杭抜き方法は、図１（ａ）に示すように、地盤Ｇに埋設された状態の不要となった既設杭Ｐを撤去するための方法であって、縁切り工程と、ワイヤ挿入工程と、ワイヤ巻き付け工程と、引き抜き工程と、を主要な構成要素としている。 The pile pulling method according to the present invention will be described with reference to FIGS. 1 to 4. As shown in FIG. 1A, this pile pulling method is a method for removing an unnecessary existing pile P buried in the ground G, and includes an edge cutting step, a wire insertion step, and the like. The wire winding process and the drawing process are the main components.

縁切り工程は、図１（ｂ）（ｃ）に示すように、下端に複数の掘削刃１が環状に配置された円筒状のケーシング２を、このケーシング２の上端側に設けたオーガ（図示せず）によってその軸周りに回転させて（図１（ｂ）中のｒ１）、その掘削刃１によって地盤Ｇに埋設された既設杭Ｐの周囲を掘削して、地盤Ｇと既設杭Ｐとの間の縁が切れた縁切り部３を形成した上でケーシング２を地盤Ｇから一旦引き抜く工程である。 In the edge cutting step, as shown in FIGS. 1 (b) and 1 (c), an auger (shown) in which a cylindrical casing 2 in which a plurality of excavating blades 1 are arranged in an annular shape at the lower end is provided on the upper end side of the casing 2. The excavation blade 1 excavates the circumference of the existing pile P buried in the ground G by rotating it around its axis (r 1 in FIG. 1 (b)), and the ground G and the existing pile P are excavated. This is a step of temporarily pulling out the casing 2 from the ground G after forming the edge cutting portion 3 having a cut edge between the two.

この縁切り工程においては、その掘削部分に、掘削と同時に水あるいは水にベントナイトを混濁させたベントナイト水等の掘削液が注入される。これにより、掘削によって形成された縁切り部３は泥状となり、縁切り工程に続いて行われるワイヤ挿入工程をスムーズに行うことができる。なお、この掘削部分に掘削液を注入せずに、単に掘削刃１で地盤Ｇを揉むことによって縁切り部３を形成する場合もある。 In this edge cutting step, an excavation liquid such as bentonite water in which bentonite is turbid in water or water is injected into the excavated portion at the same time as excavation. As a result, the edge cutting portion 3 formed by excavation becomes muddy, and the wire insertion step performed following the edge cutting step can be smoothly performed. In some cases, the edge cutting portion 3 is formed by simply rubbing the ground G with the excavation blade 1 without injecting the excavation liquid into the excavation portion.

この縁切り工程においては、磁性材料である鋼鉄製のケーシング２が使用される。このケーシング２の下端近傍の外周面には、ケーシング２の径方向外向きに突出する周方向断面が逆Ｌ字形の外側突起４が形成されている。この外側突起４を形成することによって、この外側突起４を形成しない場合と比較して、縁切り工程によって既設杭Ｐの周囲に形成される縁切り部３の径方向幅が拡大するため、ワイヤ挿入工程を一層スムーズに行うことができる。 In this edge cutting step, a steel casing 2 which is a magnetic material is used. On the outer peripheral surface near the lower end of the casing 2, an outer protrusion 4 having an inverted L-shaped circumferential cross section is formed so as to project outward in the radial direction of the casing 2. By forming the outer protrusion 4, the radial width of the edge cutting portion 3 formed around the existing pile P by the edge cutting step is increased as compared with the case where the outer protrusion 4 is not formed, so that the wire insertion step Can be performed more smoothly.

ワイヤ挿入工程は、図１（ｄ）に示すように、ケーシング２の下端に既設杭Ｐに巻き付ける巻き付け用ワイヤ５を仮止めした上で、このケーシング２を縁切り部３内に再挿入する工程である。このワイヤ挿入工程においては、縁切り工程で使用したケーシング２をそのまま使用することができる。なお、図１（ｄ）（図１（ｅ）も同様）においては、ケーシング２の外周面に形成された外側突起４の図示を省略している。 As shown in FIG. 1D, the wire insertion step is a step of temporarily fixing the winding wire 5 to be wound around the existing pile P at the lower end of the casing 2 and then reinserting the casing 2 into the edge cutting portion 3. is there. In this wire insertion step, the casing 2 used in the edge cutting step can be used as it is. In addition, in FIG. 1D (the same applies to FIG. 1E), the illustration of the outer protrusion 4 formed on the outer peripheral surface of the casing 2 is omitted.

巻き付け用ワイヤ５には、この巻き付け用ワイヤ５が巻き付けられた既設杭Ｐを地盤Ｇから引き抜くための引き抜き用ワイヤ６が連結されている。この巻き付け用ワイヤ５及び引き抜き用ワイヤ６として、既設杭Ｐの引き抜きにおける十分な強度を有する金属製ワイヤが通常用いられる。なお、引き抜き用ワイヤ６と巻き付け用ワイヤ５を１本の連続したワイヤとすることもできる。 A pull-out wire 6 for pulling out the existing pile P around which the wrapping wire 5 is wound from the ground G is connected to the wrapping wire 5. As the winding wire 5 and the drawing wire 6, a metal wire having sufficient strength in drawing out the existing pile P is usually used. The pulling wire 6 and the winding wire 5 can be made into one continuous wire.

ここで、ワイヤ挿入工程の前に予め行われる、ケーシング２に巻き付け用ワイヤ５を仮止めするためのワイヤ仮止め工程について説明する。このワイヤ仮止め工程においては、まず、図２（ａ）に示すように、ケーシング２の下端部に着脱自在の保持部材７を取り付けた上で、この保持部材７によって巻き付け用ワイヤ５を保持させる。 Here, a wire temporary fixing step for temporarily fixing the winding wire 5 to the casing 2, which is performed in advance before the wire inserting step, will be described. In this wire temporary fixing step, first, as shown in FIG. 2A, a detachable holding member 7 is attached to the lower end portion of the casing 2, and then the winding wire 5 is held by the holding member 7. ..

保持部材７は、ケーシング２の外周面に沿って上下方向に延びる基部７ａと、巻き付け用ワイヤ５を保持するとともに、この巻き付け用ワイヤ５を出し入れする開口が形成された、基部７ａの下端に連設された受け部７ｂとを有している。受け部７ｂの開口側（外側）の端部は上向きに屈曲している。このため、この受け部７ｂによって一旦保持した巻き付け用ワイヤ５が、その開口から不用意に脱落するのを防止することができる。 The holding member 7 is connected to the lower end of the base portion 7a, which holds the base portion 7a extending in the vertical direction along the outer peripheral surface of the casing 2 and the winding wire 5 and has an opening for inserting and removing the winding wire 5. It has a receiving portion 7b provided. The end of the receiving portion 7b on the opening side (outside) is bent upward. Therefore, it is possible to prevent the winding wire 5 once held by the receiving portion 7b from being inadvertently dropped from the opening.

基部７ａの裏面（ケーシング２に臨む面）には磁石８が設けられており、この磁石８の磁力によって、保持部材７を磁性材料である鋼鉄製のケーシング２に対し着脱自在としている。この保持部材７は、巻き付け用ワイヤ５を保持した際に変形しない程度の剛性を有する金属材料で構成されているが、所定の剛性を有する限りにおいて他の素材を採用することもできる。ケーシング２に取り付けられる保持部材７の個数は特に限定されないが、巻き付け用ワイヤ５を安定的に保持できるよう、ケーシング２の周方向に沿って、所定の角度間隔で４〜８個程度設けるのが好ましい。 A magnet 8 is provided on the back surface of the base portion 7a (the surface facing the casing 2), and the magnetic force of the magnet 8 makes the holding member 7 detachable from the steel casing 2 which is a magnetic material. The holding member 7 is made of a metal material having a rigidity that does not deform when the winding wire 5 is held, but other materials may be adopted as long as the holding member 7 has a predetermined rigidity. The number of holding members 7 attached to the casing 2 is not particularly limited, but about 4 to 8 holding members 7 are provided at predetermined angular intervals along the circumferential direction of the casing 2 so that the winding wire 5 can be stably held. preferable.

保持部材７によって巻き付け用ワイヤ５を保持したら、図２（ｂ）に示すように、ケーシング２の下端に形成された貫通孔９に結束部材１０が環状となるように通し、この結束部材１０によって巻き付け用ワイヤ５が吊り下げられた状態に仮止めする。この結束部材１０として、電気コード等を結束するための市販の結束バンドを採用することができる。結束部材１０の素材は特に限定されないが、ワイヤ巻き付け工程で容易にこの結束部材１０が切断されるよう、例えばポリプロピレンやナイロン等の樹脂製のものを採用するのが好ましい。 After the winding wire 5 is held by the holding member 7, as shown in FIG. 2B, the binding member 10 is passed through the through hole 9 formed at the lower end of the casing 2 so as to form an annular shape, and the binding member 10 is used. Temporarily fix the winding wire 5 in a suspended state. As the binding member 10, a commercially available binding band for binding an electric cord or the like can be adopted. The material of the binding member 10 is not particularly limited, but it is preferable to use a resin material such as polypropylene or nylon so that the binding member 10 can be easily cut in the wire winding step.

結束部材１０で巻き付け用ワイヤ５を仮止めしたら、図２（ｃ）に示すように、ケーシング２から保持部材７を取り外す。このとき、結束部材１０を少し引き締めて、図３（ａ）に示すように、巻き付け用ワイヤ５が、ケーシング２の下端に周方向に所定間隔で環状に配置された掘削刃１の下端に沿わせたり、図３（ｂ）に示すように、掘削刃１のサイドに沿わせたりするのが好ましい。このようにすると、ケーシング２の下端の掘削刃１によって縁切り部３内の土砂（泥水）がスムーズにかき分けられ、挿入に伴う圧力が巻き付け用ワイヤ５に直接作用しにくい。このため、その挿入の際に、環状に束ねた巻き付け用ワイヤ５が径方向外側に拡径してばらけた状態となるのを防止して、既設杭Ｐの所定位置にこの巻き付け用ワイヤ５を確実に巻き付けることができる。 After the winding wire 5 is temporarily fixed by the binding member 10, the holding member 7 is removed from the casing 2 as shown in FIG. 2C. At this time, the binding member 10 is slightly tightened, and as shown in FIG. 3A, the winding wire 5 is along the lower end of the excavation blade 1 which is annularly arranged at the lower end of the casing 2 at predetermined intervals in the circumferential direction. It is preferable to make it run along the side of the excavation blade 1 as shown in FIG. 3 (b). In this way, the excavation blade 1 at the lower end of the casing 2 smoothly separates the earth and sand (muddy water) in the edge cutting portion 3, and the pressure due to the insertion is unlikely to act directly on the winding wire 5. Therefore, at the time of the insertion, the winding wire 5 bundled in an annular shape is prevented from expanding in diameter outward in the radial direction and becoming loose, and the winding wire 5 is placed at a predetermined position of the existing pile P. It can be wound securely.

既設杭Ｐへの巻き付け用ワイヤ５の巻き数は少なくとも１巻きあればよいが、図２等に示すように複数回巻くことにより、既設杭Ｐへの巻き付け用ワイヤ５の巻き付け状態を安定させることができる。また、特に巻き数を複数回とする場合、巻回した巻き付け用ワイヤ５がばらけた状態となりやすく、結束部材１０による仮止めの際に複数の作業者が必要となることが多い。これに対し、この仮止めの前に巻き付け用ワイヤ５を複数回巻いた状態で保持部材７によって保持しておくと、結束部材１０による仮止めの際に手で巻き付け用ワイヤ５を保持しておく必要がないため、その仮止め作業を作業者一人で行うことができ、高い作業効率を確保することができる。 The number of windings of the winding wire 5 around the existing pile P may be at least one, but the winding state of the winding wire 5 around the existing pile P can be stabilized by winding the wire 5 a plurality of times as shown in FIG. Can be done. Further, particularly when the number of turns is set to a plurality of times, the wound winding wire 5 is likely to be in a loosened state, and a plurality of workers are often required for temporary fixing by the binding member 10. On the other hand, if the winding wire 5 is wound a plurality of times and held by the holding member 7 before the temporary fixing, the winding wire 5 is held by hand at the time of the temporary fixing by the binding member 10. Since it is not necessary to keep it, the temporary fixing work can be performed by one worker, and high work efficiency can be ensured.

ワイヤ巻き付け工程は、図１（ｅ）に示すように、ケーシング２を軸周りに回転させて（図１（ｅ）中のｒ２）仮止めされた巻き付け用ワイヤ５をケーシング２の下端から脱落させ、巻き付け用ワイヤ５が既設杭Ｐに巻き付けられた状態とする工程である。このケーシング２が軸周りに回転すると、巻き付け用ワイヤ５とこの巻き付け用ワイヤ５を仮止めする結束部材１０が互いに擦れ合い、巻き付け用ワイヤ５よりも相対的に強度が小さい結束部材１０が切断される。 In the wire winding step, as shown in FIG. 1 (e), the casing 2 is rotated about an axis (r 2 in FIG. 1 (e)), and the temporarily fixed winding wire 5 falls off from the lower end of the casing 2. This is a step in which the winding wire 5 is wound around the existing pile P. When the casing 2 rotates around an axis, the winding wire 5 and the binding member 10 that temporarily fixes the winding wire 5 rub against each other, and the binding member 10 having a strength relatively smaller than that of the winding wire 5 is cut. The wire.

このとき、巻き付け用ワイヤ５に連結された引き抜き用ワイヤ６に対し地上側で張力を与え、ケーシング２に対し巻き付け用ワイヤ５が軸周りに極力供回りしないようにするのが好ましい。このようにすると、ケーシング２に固定された結束部材１０と、引き抜き用ワイヤ６からの張力によって回り止めされた巻き付け用ワイヤ５との間の摩擦が増大し、この結束部材１０をスムーズに切断させることができる。また、結束部材１０の一部分に予め傷を形成しておくことによって、この結束部材１０を一層スムーズに切断できる可能性がある。 At this time, it is preferable to apply tension to the pull-out wire 6 connected to the winding wire 5 on the ground side so that the winding wire 5 does not rotate around the axis as much as possible with respect to the casing 2. In this way, the friction between the binding member 10 fixed to the casing 2 and the winding wire 5 stopped by the tension from the pulling wire 6 increases, and the binding member 10 is smoothly cut. be able to. Further, by forming a scratch on a part of the binding member 10 in advance, there is a possibility that the binding member 10 can be cut more smoothly.

結束部材１０が切断されて巻き付け用ワイヤ５がケーシング２の下端から既設杭Ｐ側に脱落したら、引き抜き用ワイヤ６に上向きの張力を与えて、この引き抜き用ワイヤ６に連結された巻き付け用ワイヤ５を引き締める。これによって、巻き付け用ワイヤ５が既設杭Ｐの下端部に強く巻き付けられた状態となる。巻き付け用ワイヤ５の巻き付けが完了したら、図１（ｆ）に示すように、ケーシング２を地上に引き抜く。 When the binding member 10 is cut and the winding wire 5 falls off from the lower end of the casing 2 toward the existing pile P side, an upward tension is applied to the pulling wire 6 and the winding wire 5 connected to the pulling wire 6 is applied. Tighten. As a result, the winding wire 5 is strongly wound around the lower end of the existing pile P. When the winding of the winding wire 5 is completed, the casing 2 is pulled out to the ground as shown in FIG. 1 (f).

なお、中折れ等が生じている不健全な既設杭Ｐを撤去する場合は、ケーシング２を地盤Ｇ内に残置しておく方が良い場合もある。このようにすると、引き抜き工程において既設杭Ｐの破片がばらばらになるのを防止して既設杭Ｐの全体を確実に除去することができる。 In addition, when removing an unhealthy existing pile P having a center fold or the like, it may be better to leave the casing 2 in the ground G. By doing so, it is possible to prevent the fragments of the existing pile P from falling apart in the pulling process and reliably remove the entire existing pile P.

引き抜き工程は、図１（ｇ）に示すように、引き抜き用ワイヤ６とともに巻き付け用ワイヤ５を上向きに引き上げて、既設杭Ｐを地盤Ｇから引き抜く工程である。なお、ワイヤ巻き付け工程後にケーシング２を地盤Ｇ内に残置した場合は、この引き抜き工程において既設杭Ｐとともにケーシング２を引き抜く。上記の一連の工程が完了したら、既設杭Ｐを引き抜いた穴Ｓの中に充填材を充填しつつその穴Ｓ内の土砂と混合して埋め戻し作業を行う。 As shown in FIG. 1 (g), the pulling-out step is a step of pulling up the winding wire 5 together with the pull-out wire 6 and pulling out the existing pile P from the ground G. If the casing 2 is left in the ground G after the wire winding step, the casing 2 is pulled out together with the existing pile P in this pulling step. When the above series of steps is completed, the hole S from which the existing pile P has been pulled out is filled with a filler and mixed with the earth and sand in the hole S to perform backfilling work.

既設杭Ｐの中には、図４に示すように、地盤Ｇへの支持強度を一層高めるために、既設杭Ｐの下端に大径の根固め部Ｂを形成したものがある。この根固め部Ｂが形成された既設杭Ｐの撤去に際しては、根固め部Ｂの外周に沿うように縁切り部３を形成し、根固め部Ｂに巻き付け用ワイヤ５を巻き付けることにより、図１から図３で説明したのと同じ工程によって、この根固め部Ｂとともに既設杭Ｐの引き抜きを行うことができる。 As shown in FIG. 4, some of the existing piles P have a large-diameter rooting portion B formed at the lower end of the existing pile P in order to further increase the supporting strength to the ground G. When removing the existing pile P on which the root compaction portion B is formed, an edge cutting portion 3 is formed along the outer circumference of the root compaction portion B, and the winding wire 5 is wound around the root compaction portion B. From the above, the existing pile P can be pulled out together with the rooting portion B by the same process as described with reference to FIG.

上記において説明した杭抜き方法はあくまでも例示であって、地盤Ｇ中の既設杭Ｐを簡便かつ確実に除去する、というこの発明の課題を解決し得る限りにおいて、杭抜き方法の工程の一部を適宜変更することができる。例えば、上記においては既設杭Ｐの下端部に巻き付け用ワイヤ５を巻き付けた場合について図示したが、中折れ等がない健全な既設杭Ｐの場合は、この既設杭Ｐの長さ方向の中間部あるいは上端部に巻き付け用ワイヤ５を巻き付けて引き抜きを行うこともできる。 The pile pulling method described above is merely an example, and a part of the steps of the pile pulling method can be used as long as the problem of the present invention of easily and surely removing the existing pile P in the ground G can be solved. It can be changed as appropriate. For example, in the above, the case where the winding wire 5 is wound around the lower end portion of the existing pile P is shown, but in the case of a sound existing pile P having no center folds or the like, the intermediate portion in the length direction of the existing pile P. Alternatively, the winding wire 5 can be wound around the upper end portion and pulled out.

１ 掘削刃
２ ケーシング
３ 縁切り部
４ 外側突起
５ 巻き付け用ワイヤ
６ 引き抜き用ワイヤ
７ 保持部材
７ａ 基部
７ｂ 受け部
８ 磁石
９ 貫通孔
１０ 結束部材
Ｇ 地盤
Ｐ 既設杭
Ｓ 穴
Ｂ 根固め部 1 Excavation blade 2 Casing 3 Edge cutting part 4 Outer protrusion 5 Winding wire 6 Pulling wire 7 Holding member 7a Base 7b Receiving part 8 Magnet 9 Through hole 10 Bundling member G Ground P Existing pile S Hole B Root consolidation part

Claims (1)

下端に掘削刃（１）が環状に配置された円筒状のケーシング（２）をその軸周りに回転させて、前記掘削刃（１）によって地盤（Ｇ）に埋設された既設杭（Ｐ）の周囲を掘削し、前記地盤（Ｇ）と前記既設杭（Ｐ）との間の縁が切れた縁切り部（３）を形成した上で前記ケーシング（２）を前記地盤（Ｇ）から一旦引き抜く縁切り工程と、
前記ケーシング（２）の下端部に、前記ケーシング（２）の外周面に沿って上下方向に延びる基部（７ａ）と、巻き付け用ワイヤ（５）を出し入れする開口が形成された、前記基部（７ａ）に連設された受け部（７ｂ）とを有し、前記基部（７ａ）の前記ケーシング（２）に臨む面に磁石（８）が設けられており、前記磁石（８）の磁力によって、磁性材料からなる前記ケーシング（２）に対し着脱自在とした保持部材（７）を取り付けた上で、前記受け部（７ｂ）によって前記巻き付け用ワイヤ（５）を下方から支持するように保持させ、その保持状態において、前記ケーシング（２）の下端に取り付けられた結束部材（１０）で前記巻き付け用ワイヤ（５）を前記ケーシング（２）の下端に周方向に所定間隔で環状に配置された前記掘削刃（１）に沿うように前記ケーシング（２）に仮止めし、この仮止め後に前記保持部材（７）を前記ケーシング（２）から取り外すワイヤ仮止め工程と、
前記ケーシング（２）の下端に前記既設杭（Ｐ）に巻き付ける前記巻き付け用ワイヤ（５）を仮止めした上で、前記ケーシング（２）を前記縁切り部（３）内に再挿入するワイヤ挿入工程と、
前記ケーシング（２）を軸周りに回転させて前記結束部材（１０）を切断することによって、仮止めされた前記巻き付け用ワイヤ（５）を前記ケーシング（２）から脱落させ、前記巻き付け用ワイヤ（５）が前記既設杭（Ｐ）に巻き付けられた状態とするワイヤ巻き付け工程と、
前記巻き付け用ワイヤ（５）が前記ケーシング（２）から脱落したら、引き抜き用ワイヤ（６）に上向きの張力を与えて、前記引き抜き用ワイヤ（６）に連結された前記巻き付け用ワイヤ（５）を引き締め、前記巻き付け用ワイヤ（５）を既設杭（Ｐ）の下端部に巻き付け、前記引き抜き用ワイヤ（６）とともに前記巻き付け用ワイヤ（５）を上向きに引き上げて、前記既設杭（Ｐ）を前記地盤（Ｇ）から引き抜く引き抜き工程と、
を有する杭抜き方法。 A cylindrical casing (2) in which an excavation blade (1) is arranged in an annular shape at the lower end is rotated around its axis, and the existing pile (P) buried in the ground (G) by the excavation blade (1). Edge cutting that excavates the surroundings to form an edge cutting portion (3) with a cut edge between the ground (G) and the existing pile (P), and then pulls out the casing (2) from the ground (G) once. Process and
At the lower end of the casing (2), a base portion (7a) extending in the vertical direction along the outer peripheral surface of the casing (2) and an opening for inserting and removing the winding wire (5) are formed in the base portion (7a). A magnet (8) is provided on the surface of the base portion (7a) facing the casing (2), and the magnetic force of the magnet (8) causes the base portion (7a) to have a receiving portion (7b) connected to the). A detachable holding member (7) is attached to the casing (2) made of a magnetic material, and then the winding wire (5) is held by the receiving portion (7b) so as to be supported from below. In the holding state, the winding wire (5) is annularly arranged at the lower end of the casing (2) at predetermined intervals in the circumferential direction by the binding member (10) attached to the lower end of the casing (2). A wire temporary fixing step of temporarily fixing to the casing (2) along the excavation blade (1) and then removing the holding member (7) from the casing (2) after the temporary fixing.
In terms of the said winding wire (5) wound around the existing pile (P) to the lower end of the casing (2) and temporarily fixed, the wire insertion step of re-inserting the casing (2) in the edge cutting unit (3) in When,
By rotating the casing (2) around an axis to cut the binding member (10), the temporarily fixed winding wire (5) is dropped from the casing (2), and the winding wire ( A wire winding step in which 5) is wound around the existing pile (P), and
When the winding wire (5) falls off from the casing (2), an upward tension is applied to the pulling wire (6) to pull the winding wire (5) connected to the pulling wire (6). Tightening, the winding wire (5) is wound around the lower end of the existing pile (P), the winding wire (5) is pulled upward together with the pulling wire (6) , and the existing pile (P) is pulled up. The pulling process of pulling out from the ground (G) and
Pile pulling method with.
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Publication number Priority date Publication date Assignee Title
JPS5876640U (en) * 1981-11-16 1983-05-24 島貫　東助 Pile extractor
JPS6019827A (en) * 1983-10-31 1985-02-01 Toda Constr Co Ltd Drawing work of follower pile
JPH11172674A (en) * 1997-12-15 1999-06-29 Maeda Corp Pile extraction jig and pile extraction method
US20080101874A1 (en) * 2005-08-29 2008-05-01 Alexander Robert G System and method for removal of buried objects
JP3159275U (en) * 2010-02-24 2010-05-13 博 小野寺 Pile extraction jig
JP2010255300A (en) * 2009-04-24 2010-11-11 Toshihiko Fujii Pull-out construction method for subterranean residual pile and jig used for construction method
JP2012112149A (en) * 2010-11-24 2012-06-14 Koki Co Ltd Pile removal and backfill method and connection structure of backfill agent supply pipes
JP2012122197A (en) * 2010-12-06 2012-06-28 Yokohama Wright Industries Co Ltd Drawing method for buried pile and foam water generating device
JP2015214795A (en) * 2014-05-08 2015-12-03 横浜ライト工業株式会社 Pull-out method of embedded pile embedded in ground and drilling casing structure for use in the same
JP2017206814A (en) * 2016-05-16 2017-11-24 太洋基礎工業株式会社 Method and device for pulling out buried pile
JP2017227049A (en) * 2016-06-23 2017-12-28 太洋基礎工業株式会社 Pulling out method for embedded pile and apparatus thereof
JP2019015023A (en) * 2017-07-03 2019-01-31 藤井　健之 Pile extraction device and pile extraction method

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5876640U (en) * 1981-11-16 1983-05-24 島貫　東助 Pile extractor
JPS6019827A (en) * 1983-10-31 1985-02-01 Toda Constr Co Ltd Drawing work of follower pile
JPH11172674A (en) * 1997-12-15 1999-06-29 Maeda Corp Pile extraction jig and pile extraction method
US20080101874A1 (en) * 2005-08-29 2008-05-01 Alexander Robert G System and method for removal of buried objects
JP2010255300A (en) * 2009-04-24 2010-11-11 Toshihiko Fujii Pull-out construction method for subterranean residual pile and jig used for construction method
JP3159275U (en) * 2010-02-24 2010-05-13 博 小野寺 Pile extraction jig
JP2012112149A (en) * 2010-11-24 2012-06-14 Koki Co Ltd Pile removal and backfill method and connection structure of backfill agent supply pipes
JP2012122197A (en) * 2010-12-06 2012-06-28 Yokohama Wright Industries Co Ltd Drawing method for buried pile and foam water generating device
JP2015214795A (en) * 2014-05-08 2015-12-03 横浜ライト工業株式会社 Pull-out method of embedded pile embedded in ground and drilling casing structure for use in the same
JP2017206814A (en) * 2016-05-16 2017-11-24 太洋基礎工業株式会社 Method and device for pulling out buried pile
JP2017227049A (en) * 2016-06-23 2017-12-28 太洋基礎工業株式会社 Pulling out method for embedded pile and apparatus thereof
JP2019015023A (en) * 2017-07-03 2019-01-31 藤井　健之 Pile extraction device and pile extraction method

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