JP4069313B2

JP4069313B2 - Method and apparatus for crushing and removing joints of existing piles

Info

Publication number: JP4069313B2
Application number: JP14403199A
Authority: JP
Inventors: 孝行朝井
Original assignee: Mitani Sekisan Co Ltd
Current assignee: Mitani Sekisan Co Ltd
Priority date: 1999-05-24
Filing date: 1999-05-24
Publication date: 2008-04-02
Anticipated expiration: 2019-05-24
Also published as: JP2000328569A

Description

【０００１】
【発明の属する技術分野】
この発明は、既設の中空杭を撤去する際に使用する既設杭の継手部の破砕除去方法及び装置に関する。
【０００２】
【従来の技術】
既設の建物を解体して、その場所に新しい建物を施工する際に、地中に打ち込まれたコンクリート杭が施工の障害となる場合には、これを撤去する必要があった。また、回転埋設工法により既製コンクリート杭を埋設した場合に、既製コンクリート杭がねじれ破壊を生じるなどの施工不良を生じた場合、これを取り除く必要があった。
【０００３】
このような場合、コンクリート杭の外周にケーシングを挿入し、これを回転するさせることにより杭周を掘削し、既設杭を引き抜く工法が提案されている（特許第２８６３４８７号）。また、他の方法では、オーガー軸先端のスクリュー刃を回転させることにより既設杭を破砕し、既設杭の端板をロッドの軸に突設した切断刃で回転して水平方向に既設杭を切断して端板を除去する方法も提案されている（特開平９−２０３０３９号）。
【０００４】
【発明が解決しようとする課題】
前記従来の技術のうち、前者の場合では装置が大がかりとなる問題点があり、後者の場合では、杭径が比較的小さい（３００〜５００ｍｍ程度）場合には有効であるが、大径の場合や杭の肉厚が厚い場合には、良好に破砕できない問題点があった。
【０００５】
【課題を解決するための手段】
然るにこの発明では、破砕除去装置を既設杭の継手部に押圧し、生じる反力により杭内周壁で外方に向けた押圧力を生じさせて、回転しながら前記既設杭を切断して破砕除去方法を構成するので、また破砕刃を有する下腕と上腕とかるなる略「く」字状の破砕腕を揺動自在に取り付けて装置を構成するので、前記問題点を解決した。
【０００６】
即ちこの発明は、中空の既設杭の継手部を露出させ、該継手部を破砕し除去することを兼ね揃えた破砕除去装置を下降させて前記継手部に押圧し、前記継手部の上端又は内周壁を押圧して、該部を力点として、該力点で生じる反力を、継手部下方の杭内周壁に設定した作用点で、外方に向けて押圧する力を生じさせて、続いて、前記破砕除去装置を回転しながら下降させ、前記作用点において前記既設杭の内周壁に環状の溝を形成しながら前記既設杭を切断して、前記既設杭から前記継手部を分離し、続いて、前記破砕除去装置に継手部を係止して上昇させることにより、継手部を除去することを特徴とした既設杭の継手部の破砕除去方法である。
【０００７】
また、前記において、破砕除去装置に、上腕及び下腕からなる破砕腕を揺動自在に設け、前記上腕に力点を形成し、前記下腕の下端部に設けた破砕刃を作用点とした既設杭の継手部の破砕除去方法である。
【０００８】
また、この発明は、既設中空杭の継手部を破砕除去する装置であって、該既設杭の中空部内に挿入できる装置本体の外面に放射状に水平軸を設け、該水平軸に、下端部に破砕刃を有する下腕の上端部を揺動自在に取付け、前記下腕の上端部に横方向に上腕を連設して、前記上腕及び下腕からなる略「く」字状の破砕腕を形成したことを特徴とする既設杭の継手部の破砕除去装置である。
【０００９】
また、前記において、上腕が破壊すべき既設杭の内周に当接した状態で、破砕刃が前記既設杭の内壁に当接し、かつ前記上腕の先端が前記既設杭の内壁に当接した状態で、破砕刃は前記既設杭の外壁付近に位置する構造としたことを特徴とする既設杭の継手部の破砕除去装置である。また、破砕腕は自重で、下腕が下方に垂れた状態となるように形成すると共に、装置本体に、前記破砕腕の下腕が、上腕の反対側へ揺動することを制限するストッパーを設けた既設杭の継手部の破砕除去装置である。更に、既設杭の継手部が破砕分離された後、上腕及び下腕によって、破砕された前記継手部を保持、係止して除去できることを特徴とする既設杭の継手部の破砕除去装置である。
【００１０】
【発明の実施の形態】
既設杭２３の中空部２４内に挿入できる大きさの装置本体１の側面で直径対称な位置に水平方向に水平軸３、３を設け、破砕刃１７を有する破砕腕５を揺動自在に軸止する。破砕腕５は、下端に破砕刃１７を設けた下腕６の上端部を水平軸３に軸止し、該下腕６の上端部に、横方向に上腕１２が連設されてなり、全体が正面視略「く」字状に屈曲した形状となっている。装置本体１に、破砕腕５の揺動方向を規制するストッパー１８を固定して、継手部の破砕除去装置２０を構成する（図１）。
【００１１】
この破砕除去装置２０は、既設杭２０の中空部２４内に、破砕刃１７付きの下腕を６、６を挿入し、破砕除去装置２０を回転させながら下方に押しつけて、上腕１２、１２を既設杭２０の上端に押圧して（力点）該部を案内として、その反発力により、破砕刃１７、１７を既設杭２０の内壁２５に押し当てて（作用点）、環状の溝３０を形成しつつ、既設杭２０の継手部２８を分離する（図２（ｂ）〜（ｄ））。破砕除去装置２０のさらなる押圧で、破砕腕５の上腕１２の先端１３が既設杭２３の内周壁２５に当接し、下腕６の破砕刃１７が既設杭２３の外周壁２６より外方に突出する（図３）。分離された継手部２８は、破砕除去装置２０を引き上げることにより、破砕腕５、５に係止されて地上に引き上げられる（図４）。
【００１２】
【実施例１】
図面に基づきこの発明の実施例を説明する。
【００１３】
破壊すべき既設杭２３の中空部２４内に挿入できる大きさの装置本体１の上端にオーガー軸２２に連結する為の連結部２を形成し、前記装置本体１の側面で直径対称な位置に水平方向に水平軸３、３を設け、該水平軸３、３に下端部に破砕刃１７を有する破砕腕５を揺動自在に夫々軸止する。
【００１４】
前記破砕腕５は、下端に破砕刃１７を設けた下腕６と上腕１２とからなり、該下腕６の上端部７に膨大部１１が形成され、該膨大部１１に前記水平軸３が取り付けられ、前記膨大部（上腕の上端部）１１に横方向に上腕１２が連設され、前記破砕腕５は全体が正面視略「く」字状に屈曲した形状となっている。また、前記破砕腕５は、自重で下腕６が下方に垂れた状態となるように上腕１２より下腕６が長く（容積が大きく）形成されている。また、破砕刃１７は、下腕６の一側縁９より突出して形成されており、前記上腕１２も下腕６の一側縁９側に突出して形成してある。
【００１５】
また、前記破砕腕５は、下腕６が破砕すべき既設杭２３の中空部２４内に入り、上腕１２の一側縁１４が既設杭２３の内周壁２５の上端２５ａに当接した状態で、下腕６の破砕刃１７の先端が内周壁２５に当接できるように形成されている（図２（ｂ）。またこ、の状態で、上腕１２の先端１３は既設杭２３の外周壁２６より内側に位置していることが望ましい。）。なおかつ、前記破砕腕５は、上腕１２の先端１３が既設杭２３の内周壁２５に当接した状態で、破砕刃１７が既設杭２３の外周壁２６より外方に突出する位置に位置するように形成されている（図３）。
【００１６】
また、前記装置本体１に、下腕６の他側縁１０に当接して、破砕腕５の揺動方向を規制するストッパー１８を固定して、この発明の継手部の破砕除去装置２０を構成する（図１）。
【００１７】
前記実施例において、前記破砕腕５は、上腕１２の先端１３が既設杭２３の内周壁に当接した状態で、破砕刃１７が既設杭２３の外周壁２６より外方に突出する位置に位置するように形成することが望ましいが、破砕刃１７は外周壁２６から突出しなくとも、少なくとも既設杭２３を切断できる程度に、外周壁２６付近に位置させることもできる（図示していない）。
【００１８】
また、前記実施例において、装置本体に、破砕腕５の破砕刃１７に向けて水や圧縮空気を吹き付ける為のノズルを設けることもできる（図示していない）。
【００１９】
また、前記実施例において、下腕６と上腕１２との成す角（図１で、直線ＡとＢの成す角）は８５角度程度としてあるので、バランスが良く、杭径の対応範囲が広く、破砕効率が良いが、６０〜１２０度程度の範囲で他の角度に設定することもできる（図示していない）。
【００２０】
【実施例２】
次に、前記実施例に基づきこの発明の破砕除去装置２０の使用、即ち破砕除去方法について説明する。
【００２１】
(1) 破砕予定の既設杭２３は破砕及び継手部を除去できる位置まで、既設杭２３の中空部２４の土や硬化したセメントミルクなどを除去する。また、破砕時の摩擦熱により破砕腕５及び破砕刃１７が破傷するおそれがあるため、既設杭２３の中空部２４内には破砕位置まで予め水等を溜める等の冷却手段を施すことが望ましい。
【００２２】
(2) オーガー軸２２の下端部に破砕除去装置２０の連結部２を連結して、継手金物２７（継手部２８）が上端に位置した既設杭２３の上方から、破砕除去装置２０（オーガー軸２２）をゆっりと下降して、破砕除去装置２０を既設杭２３の中空部２４内に挿入する（図２（ａ））。この状態で、破砕腕５は自重で、下腕６が下方に垂れた状態となっており、かつストッパー１８により他側に揺動することが規制される。
【００２３】
(3) 下降した破砕除去装置２０の上腕１２が既設杭２３の上端に当接した状態で（力点）、更に破砕除去装置２０を下方に押し込むと、上腕１２の一側縁１４が既設杭２３の内周壁２５の上端２５ａに当接した状態で、下腕６の破砕刃１７が既設杭２３の内周壁２５であって、継手金物２７の下方に当接する（作用点）。ここで、破砕腕５はストッパー１８により揺動が制限されているので、上腕１２及び下腕６が共に既設杭２３の中空部２４内に挿入されることを防止し、上腕１２は必ず既設杭２３の上端に当接できる。
【００２４】
(4) 続いて、オーガー軸２２を回転して、破砕除去装置２０を回転しながら下方に押さえつけて、両側の破砕腕５、５の破砕刃１７で既設杭２３を内周壁２５から環状の溝３０を外方に向けて広げながら破砕する（図２（ｃ））。この際、上腕１２の上腕１２の一側縁１４が既設杭２３の内周壁２５の上端２５ａに当接した状態で、回転するので、上腕１２が案内となり、既設杭２３の内周壁２５の上縁２５ａは徐々に上腕１２の先端１３側に移動しながら、ほぼ同一高さで破砕刃１７が回転するので、環状の溝３０を形成できる。また、２つの破砕腕５、５により、破砕刃１７、１７及び案内となる上腕１２、１２は、夫々直径対称の位置に２ヶ所づつ設定されるので、切断（環状の溝３０の形成）の正確さと効率とを高められる。また、このとき、オーガー軸２２の押圧及び／又は回転負荷を張設することにより、破砕時間を短縮することができる。
【００２５】
(5) 更に破砕除去装置２０を回転しながら、押し込むと、既設杭２３の内部のＰＣ鋼棒などの鉄筋を切断して、環状の溝３０が既設杭２３の外周壁２６側に貫通し、破砕刃１７も既設杭２３の外周壁２６側に貫通している（図２（ｄ））。この際、上腕１２は、まだ既設杭２３の内周壁２５の上端２５ａに当接している。
【００２６】
(6) この状態で、一旦オーガー軸２２の回転を止め、オーガー軸２２を引き下げると、上腕１２の先端１３は既設杭２３の中空部２４内に入り、内周壁２５に当接する（図３）。この状態で、破砕刃１７は、既設杭２３の外周壁２６より外方に突出する。
【００２７】
(7) 以上のようにして、既設杭２３から継手部２８を分離し、再びオーガー軸２２を回転させながら破砕除去装置２０（オーガー軸２２）をゆっくりと引き上げる。この際、分離された継手部２８は、下縁を破砕腕５、５の下腕（破砕刃）６、６に係止し、内周壁２５を上腕１２、１２の先端１３、１３で押圧されて、合計４ヶ所で確実に破砕除去装置２０に保持され、地上に引き上げられる（図４）。
【００２８】
(8) 続いて、従来の方法により（例えば、特開平９−２０３０３９号の杭破砕ヘッド２５を使用して）、下方の継手部２８ａの直上まで、既設杭２３の軸部２９を破砕する。続いて、上記(1) 〜(7) の方法により、継手部２８ａを破砕除去する。以上の作業を繰り返して、既設杭２３を破壊する（図５）。
【００２９】
【発明の効果】
破砕除去装置を既設杭の継手部に押圧し、生じる反力により杭内周壁で外方に向けた押圧力を生じさせて、回転しながら前記既設杭を切断して破砕除去方法を構成するので、オーガー軸の押圧力回転力を利用して、従来のオーガーを使用して、効率良く既設杭を切断して継手部を除去できる効果がある。
【００３０】
また、破砕刃を有する下腕と上腕とからなる略「く」字状の破砕腕を揺動自在に取り付けて装置を構成するので、超大径杭（杭径１２００ｍｍ程度）の既設杭や肉厚の厚い（２００ｍｍ程度）既設杭であっても、大規模な装置を使用しなくても、環状の溝を形成して容易に切断して継手部を除去できる効果がある。また、この発明の方法又は装置を使用すれば、幅広い杭径（例えば、３００〜１２００ｍｍ程度）に対応できる効果がある。
【図面の簡単な説明】
【図１】この発明の装置の正面図である。
【図２】この発明の実施例の破砕除去方法を説明する概略した正面図で、（ａ）は装置を挿入前、（ｂ）は切断開始直前、（ｃ）切断中、（ｄ）切断完了後を夫々表す。
【図３】同じく切断完了後に下腕を外方に突出させた状態の正面図である。
【図４】同じく切断した継手部を除去した状態の正面図である。
【図５】既設杭の概略した正面図である。
【符号の説明】
１装置本体
２連結部
３水平軸
４水平軸の中心
５破砕腕
６下腕
７上端部（下腕）
８下端部（下腕）
９一側（下腕）
１０他側（下腕）
１１膨大部
１２上腕
１３先端（上腕）
１４一側（上腕）
１５他側（上腕）
１７破砕刃
１８ストッパー
２０継手部の破砕除去装置
２２オーガー軸
２３既設杭
２４中空部（既設杭）
２５内周壁（既設杭）
２５ａ内周壁の上端（既設杭）
２６外周壁（既設杭）
２７継手金物（既設杭）
２８継手部（既設杭）
３０環状の溝
Ａ下腕の中心軸
Ｂ上腕の中心軸[0001]
BACKGROUND OF THE INVENTION
This invention relates to the crushing removal method and apparatus of the joint part of the existing pile used when removing the existing hollow pile.
[0002]
[Prior art]
When dismantling an existing building and constructing a new building at that location, if a concrete pile driven into the ground would interfere with the construction, it was necessary to remove it. In addition, when a ready-made concrete pile was buried by the rotary burying method, it was necessary to remove this if a ready-made concrete pile had a construction failure such as torsional failure.
[0003]
In such a case, a method has been proposed in which a casing is inserted into the outer periphery of a concrete pile and rotated to excavate the periphery of the pile, and the existing pile is pulled out (Japanese Patent No. 2863487). In another method, the existing pile is crushed by rotating the screw blade at the tip of the auger shaft, and the existing pile is rotated horizontally with the cutting blade protruding from the rod shaft to cut the existing pile in the horizontal direction. A method for removing the end plate has also been proposed (Japanese Patent Laid-Open No. 9-203039).
[0004]
[Problems to be solved by the invention]
Among the prior arts, there is a problem that the apparatus becomes large in the former case, and in the latter case, it is effective when the pile diameter is relatively small (about 300 to 500 mm). When piles and piles were thick, there was a problem that they could not be crushed well.
[0005]
[Means for Solving the Problems]
However, in this invention, the crushing and removing device is pressed against the joint portion of the existing pile, and the reaction force generated causes a pressing force directed outward on the inner peripheral wall of the pile, and the existing pile is cut and crushed and removed while rotating. Since the method is configured, the apparatus is configured by swingably attaching a substantially “<”-shaped crushing arm consisting of a lower arm and an upper arm having crushing blades, thereby solving the above-mentioned problems.
[0006]
That is, according to the present invention, the joint portion of the hollow existing pile is exposed, the crushing and removing device that also serves to crush and remove the joint portion is lowered and pressed against the joint portion, and the upper end or the inner Pressing the peripheral wall, using the part as a force point, the reaction force generated at the force point is generated at the point of action set on the inner peripheral wall of the pile below the joint part, causing a force to press outward, The crushing and removing apparatus is lowered while rotating, and the joint pile is separated from the existing pile by cutting the existing pile while forming an annular groove on the inner peripheral wall of the existing pile at the point of action. A method for crushing and removing a joint portion of an existing pile, wherein the joint portion is removed by engaging and lifting the joint portion to the crushing and removing device.
[0007]
Further, in the above, the crushing and removing device is provided with a crushing arm composed of an upper arm and a lower arm so as to be swingable, a power point is formed on the upper arm, and a crushing blade provided on a lower end portion of the lower arm is used as an action point. This is a method for crushing and removing a joint portion of a pile.
[0008]
Further, the present invention is an apparatus for crushing and removing a joint portion of an existing hollow pile, provided with a horizontal axis radially on the outer surface of the apparatus main body that can be inserted into the hollow part of the existing pile, An upper end of a lower arm having a crushing blade is swingably attached, and an upper arm is laterally connected to the upper end of the lower arm so that a substantially "<"-shaped crushing arm composed of the upper and lower arms is formed. It is the crushing removal apparatus of the joint part of the existing pile characterized by having formed.
[0009]
Further, in the above, in a state where the upper arm is in contact with the inner periphery of the existing pile to be destroyed, the crushing blade is in contact with the inner wall of the existing pile, and the tip of the upper arm is in contact with the inner wall of the existing pile And the crushing blade is the structure located in the outer-wall vicinity of the said existing pile, It is the crushing removal apparatus of the joint part of the existing pile characterized by the above-mentioned. In addition, the crushing arm is formed with its own weight so that the lower arm hangs downward, and a stopper for restricting the lower arm of the crushing arm from swinging to the opposite side of the upper arm is provided on the apparatus body. It is the crushing removal apparatus of the joint part of the provided existing pile. Furthermore, after the joint portion of the existing pile is crushed and separated, the joint portion crushed and removed by the upper arm and the lower arm can be held and locked and removed. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Horizontal shafts 3 and 3 are provided in a horizontal direction at positions symmetric in diameter on the side surface of the apparatus main body 1 having a size that can be inserted into the hollow portion 24 of the existing pile 23, and the crushing arm 5 having the crushing blades 17 can be pivoted freely. Stop. The crushing arm 5 has an upper end of a lower arm 6 provided with a crushing blade 17 at the lower end, fixed to the horizontal shaft 3, and an upper arm 12 connected in a lateral direction to the upper end of the lower arm 6. Is bent into a generally “<” shape when viewed from the front. A stopper 18 for restricting the swinging direction of the crushing arm 5 is fixed to the apparatus main body 1 to constitute a crushing and removing apparatus 20 for the joint (FIG. 1).
[0011]
This crushing and removing apparatus 20 inserts the lower arms 6 and 6 with crushing blades 17 into the hollow portion 24 of the existing pile 20 and presses the upper arms 12 and 12 downward while rotating the crushing and removing apparatus 20. Pressing against the upper end of the existing pile 20 (force point), using this part as a guide, the repulsive force presses the crushing blades 17 and 17 against the inner wall 25 of the existing pile 20 (point of action) to form an annular groove 30 However, the joint part 28 of the existing pile 20 is separated (FIGS. 2B to 2D). By further pressing of the crushing and removing device 20, the tip 13 of the upper arm 12 of the crushing arm 5 comes into contact with the inner peripheral wall 25 of the existing pile 23, and the crushing blade 17 of the lower arm 6 protrudes outward from the outer peripheral wall 26 of the existing pile 23. (FIG. 3). The separated joint portion 28 is pulled up to the ground by being locked to the crushing arms 5 and 5 by pulling up the crushing and removing device 20 (FIG. 4).
[0012]
[Example 1]
Embodiments of the present invention will be described with reference to the drawings.
[0013]
A connecting portion 2 for connecting to the auger shaft 22 is formed at the upper end of the apparatus main body 1 having a size that can be inserted into the hollow portion 24 of the existing pile 23 to be destroyed, and is located at a symmetric diameter position on the side surface of the apparatus main body 1. Horizontal shafts 3 and 3 are provided in the horizontal direction, and the crushing arms 5 having crushing blades 17 at the lower ends of the horizontal shafts 3 and 3 are pivotally supported.
[0014]
The crushing arm 5 includes a lower arm 6 and an upper arm 12 provided with a crushing blade 17 at a lower end, and an enormous portion 11 is formed on an upper end portion 7 of the lower arm 6, and the horizontal axis 3 is formed on the enormous portion 11. The upper arm 12 is connected to the enormous portion (upper end portion of the upper arm) 11 in the lateral direction, and the crushing arm 5 is bent in a generally “<” shape when viewed from the front. The crushing arm 5 is formed such that the lower arm 6 is longer (larger in volume) than the upper arm 12 so that the lower arm 6 hangs downward due to its own weight. The crushing blade 17 is formed so as to protrude from one side edge 9 of the lower arm 6, and the upper arm 12 is also formed so as to protrude toward the one side edge 9 of the lower arm 6.
[0015]
Further, the crushing arm 5 enters the hollow portion 24 of the existing pile 23 to be crushed by the lower arm 6, and one side edge 14 of the upper arm 12 is in contact with the upper end 25 a of the inner peripheral wall 25 of the existing pile 23. The tip of the crushing blade 17 of the lower arm 6 is formed so as to be able to contact the inner peripheral wall 25 (FIG. 2B). In this state, the tip 13 of the upper arm 12 is the outer peripheral wall of the existing pile 23. It is desirable to be located inside 26.) Further, the crushing arm 5 is located at a position where the crushing blade 17 protrudes outward from the outer peripheral wall 26 of the existing pile 23 in a state where the tip 13 of the upper arm 12 is in contact with the inner peripheral wall 25 of the existing pile 23. (FIG. 3).
[0016]
Further, a stopper 18 that abuts the other side edge 10 of the lower arm 6 and regulates the swinging direction of the crushing arm 5 is fixed to the apparatus main body 1 to constitute the joint crushing and removing apparatus 20 of the present invention. (FIG. 1).
[0017]
In the embodiment, the crushing arm 5 is located at a position where the crushing blade 17 protrudes outward from the outer peripheral wall 26 of the existing pile 23 with the tip 13 of the upper arm 12 in contact with the inner peripheral wall of the existing pile 23. However, the crushing blade 17 can be positioned in the vicinity of the outer peripheral wall 26 so as to cut at least the existing pile 23 without projecting from the outer peripheral wall 26 (not shown).
[0018]
Moreover, in the said Example, the nozzle for spraying water and compressed air toward the crushing blade 17 of the crushing arm 5 can also be provided in the apparatus main body (not shown).
[0019]
In the above embodiment, the angle formed by the lower arm 6 and the upper arm 12 (the angle formed by the straight lines A and B in FIG. 1) is about 85, so that the balance is good and the corresponding range of the pile diameter is wide. Although crushing efficiency is good, it can also be set to another angle in the range of about 60 to 120 degrees (not shown).
[0020]
[Example 2]
Next, the use of the crushing and removing apparatus 20 of the present invention, that is, the crushing and removing method will be described based on the above-described embodiment.
[0021]
(1) The existing pile 23 to be crushed removes soil, hardened cement milk, and the like from the hollow portion 24 of the existing pile 23 to a position where the crushed and joint portions can be removed. In addition, since the crushing arm 5 and the crushing blade 17 may be damaged due to frictional heat at the time of crushing, cooling means such as preliminarily storing water or the like up to the crushing position may be provided in the hollow portion 24 of the existing pile 23. desirable.
[0022]
(2) The connecting portion 2 of the crushing / removing device 20 is connected to the lower end portion of the auger shaft 22, and the crushing / removing device 20 (auger shaft) is connected to the upper side of the existing pile 23 where the fitting 27 (joint portion 28) is located at the upper end. 22) is slowly lowered, and the crushing and removing device 20 is inserted into the hollow portion 24 of the existing pile 23 (FIG. 2A). In this state, the crushing arm 5 is under its own weight, the lower arm 6 is hung downward, and the stopper 18 restricts the swinging arm 5 from swinging to the other side.
[0023]
(3) With the upper arm 12 of the crushing / removing device 20 lowered and in contact with the upper end of the existing pile 23 (power point), when the crushing / removing device 20 is further pushed downward, one side edge 14 of the upper arm 12 is moved to the existing pile 23. The crushing blade 17 of the lower arm 6 is in contact with the upper end 25a of the inner peripheral wall 25 of the existing inner wall 25 of the existing pile 23, and contacts the lower part of the joint hardware 27 (action point). Here, since the crushing arm 5 is restricted from swinging by the stopper 18, both the upper arm 12 and the lower arm 6 are prevented from being inserted into the hollow portion 24 of the existing pile 23, and the upper arm 12 is always attached to the existing pile. 23 can be brought into contact with the upper end.
[0024]
(4) Subsequently, the auger shaft 22 is rotated, the crushing / removing device 20 is rotated and pressed downward, and the existing pile 23 is removed from the inner peripheral wall 25 by the crushing blades 17 of the crushing arms 5 and 5 on both sides. It crushes, expanding 30 outward (FIG.2 (c)). At this time, the upper arm 12 rotates with one side edge 14 of the upper arm 12 in contact with the upper end 25 a of the inner peripheral wall 25 of the existing pile 23, so that the upper arm 12 serves as a guide, While the edge 25a gradually moves toward the tip 13 of the upper arm 12, the crushing blade 17 rotates at substantially the same height, so that an annular groove 30 can be formed. In addition, the crushing blades 17 and 17 and the upper arms 12 and 12 that serve as guides are set at two positions symmetric to each other by the two crushing arms 5 and 5, so that cutting (formation of the annular groove 30) is performed. Increase accuracy and efficiency. At this time, the crushing time can be shortened by tensioning the auger shaft 22 and / or the rotational load.
[0025]
(5) When the crushing and removing device 20 is further rotated and pushed in, the reinforcing bar such as the PC steel bar inside the existing pile 23 is cut, and the annular groove 30 penetrates to the outer peripheral wall 26 side of the existing pile 23, The crushing blade 17 also penetrates to the outer peripheral wall 26 side of the existing pile 23 (FIG. 2D). At this time, the upper arm 12 is still in contact with the upper end 25 a of the inner peripheral wall 25 of the existing pile 23.
[0026]
(6) In this state, once the rotation of the auger shaft 22 is stopped and the auger shaft 22 is pulled down, the tip 13 of the upper arm 12 enters the hollow portion 24 of the existing pile 23 and contacts the inner peripheral wall 25 (FIG. 3). . In this state, the crushing blade 17 protrudes outward from the outer peripheral wall 26 of the existing pile 23.
[0027]
(7) As described above, the joint portion 28 is separated from the existing pile 23, and the crushing and removing device 20 (auger shaft 22) is slowly pulled up while rotating the auger shaft 22 again. At this time, the separated joint portion 28 engages the lower edge with the lower arms (crushing blades) 6 and 6 of the crushing arms 5 and 5, and the inner peripheral wall 25 is pressed by the tips 13 and 13 of the upper arms 12 and 12. Thus, it is securely held by the crushing and removing device 20 at a total of four locations and pulled up to the ground (FIG. 4).
[0028]
(8) Subsequently, the shaft portion 29 of the existing pile 23 is crushed by a conventional method (for example, using the pile crushing head 25 of JP-A-9-203039) to the position directly above the lower joint portion 28a. Subsequently, the joint portion 28a is crushed and removed by the methods (1) to (7). The above work is repeated to destroy the existing pile 23 (FIG. 5).
[0029]
【The invention's effect】
Since the crushing and removing device is pressed against the joint portion of the existing pile, and the reaction force generated causes a pressing force directed outward on the inner wall of the pile, and the crushing and removing method is configured by cutting the existing pile while rotating. The conventional auger is used to effectively cut the existing pile and remove the joint portion by utilizing the pressing force rotation force of the auger shaft.
[0030]
In addition, since the device is configured by swinging a substantially "<" shaped crushing arm consisting of a lower arm and an upper arm having a crushing blade, the existing pile or wall thickness of a super-large-diameter pile (pile diameter of about 1200 mm) Even if it is a thick (about 200 mm) existing pile, even if it does not use a large-scale apparatus, there exists an effect which can form an annular groove, can be cut easily, and can remove a joint part. Moreover, if the method or apparatus of this invention is used, there exists an effect which can respond to a wide pile diameter (for example, about 300-1200 mm).
[Brief description of the drawings]
FIG. 1 is a front view of an apparatus according to the present invention.
FIG. 2 is a schematic front view illustrating a crushing and removing method according to an embodiment of the present invention, where (a) is before insertion of the device, (b) is immediately before starting cutting, (c) during cutting, and (d) cutting is completed. Represents each after.
FIG. 3 is a front view of the state where the lower arm is protruded outward after completion of cutting.
FIG. 4 is a front view showing a state where the cut joint portion is also removed.
FIG. 5 is a schematic front view of an existing pile.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Connecting part 3 Horizontal axis 4 Center of horizontal axis 5 Crushing arm 6 Lower arm 7 Upper end part (lower arm)
8 Lower end (lower arm)
9 One side (lower arm)
10 Other side (lower arm)
11 Enlarged part 12 Upper arm 13 Tip (upper arm)
14 One side (upper arm)
15 Other side (upper arm)
17 Crushing blade 18 Stopper 20 Crushing and removing device 22 for joint part Auger shaft 23 Existing pile 24 Hollow part (existing pile)
25 Inner wall (existing pile)
25a Top of inner wall (existing pile)
26 Perimeter wall (existing pile)
27 Joint hardware (existing pile)
28 Joint (existing pile)
30 Annular groove A Center axis of lower arm B Center axis of upper arm

Claims

Expose the joint part of the hollow existing pile, lower the crushing and removing device that also serves to crush and remove the joint part, press against the joint part, and press the upper end or inner peripheral wall of the joint part The reaction force generated at the force point is set at the action point set on the pile inner peripheral wall below the joint portion, and the force for pressing outward is generated. Lowering while rotating, cutting the existing pile while forming an annular groove on the inner peripheral wall of the existing pile at the point of action, separating the joint from the existing pile, and subsequently the crushing and removing device A method for crushing and removing a joint portion of an existing pile, wherein the joint portion is removed by engaging and lifting the joint portion.

The existing crushing device according to claim 1, wherein a crushing arm comprising an upper arm and a lower arm is swingably provided in the crushing / removing device, a force point is formed on the upper arm, and a crushing blade provided on a lower end portion of the lower arm is used as an action point. A method for crushing and removing pile joints.

A device for crushing and removing a joint portion of an existing hollow pile, wherein a horizontal axis is provided radially on the outer surface of the device body that can be inserted into the hollow portion of the existing pile, and the lower arm has a crushing blade at the lower end portion The upper arm of the lower arm is swingably mounted, and the upper arm is connected to the upper arm of the lower arm in the lateral direction to form a substantially "<"-shaped crushing arm composed of the upper arm and the lower arm. A device for crushing and removing joints of existing piles.

In a state where the upper arm is in contact with the inner periphery of the existing pile to be destroyed, the crushing blade is in contact with the inner wall of the existing pile, and the tip of the upper arm is in contact with the inner wall of the existing pile, The apparatus for crushing and removing a joint portion of an existing pile according to claim 3, wherein the apparatus is located near an outer wall of the existing pile.

The crushing arm is its own weight, and the lower arm is formed so as to hang downward, and a stopper is provided on the apparatus body to restrict the lower arm of the crushing arm from swinging to the opposite side of the upper arm. The crushing removal apparatus of the joint part of the existing pile of Claim 3.

4. The joint removal part of an existing pile according to claim 3, wherein the joint part of the existing pile can be held and locked by the upper arm and the lower arm after the joint part of the existing pile is crushed and separated. apparatus.