JP4619886B2 - Widening excavation method - Google Patents

Widening excavation method Download PDF

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JP4619886B2
JP4619886B2 JP2005216680A JP2005216680A JP4619886B2 JP 4619886 B2 JP4619886 B2 JP 4619886B2 JP 2005216680 A JP2005216680 A JP 2005216680A JP 2005216680 A JP2005216680 A JP 2005216680A JP 4619886 B2 JP4619886 B2 JP 4619886B2
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widening
bucket
excavation
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与一 井口
淳 隅蔵
克己 向井
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丸五基礎工業株式会社
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Description

本発明は、アースドリル工法によって大口径、長尺の場所打ちコンクリート杭を築造する際、杭先端部を拡幅して杭先端の地耐力を増加させるとともに、拡幅部を孔軸方向に長く形成することにより、拡幅部分の表面積を広く取り、そこに生じる摩擦力を増大させ、摩擦による支持力増加及び摩擦による引抜力増加を図ることにより、最も経済的な場所打ちコンクリート杭を築造するための拡幅掘削装置を用いた拡幅掘削方法に関するものである。 When constructing a large-diameter, long cast-in-place concrete pile by the earth drill method, the present invention widens the pile tip to increase the earth bearing strength of the pile tip and forms the widened portion long in the hole axis direction. By widening the surface area of the widened portion, increasing the frictional force generated there, increasing the supporting force due to friction and increasing the pulling force due to friction, widening to build the most economical cast-in-place concrete pile it relates widening drilling method using the drilling device.

ビルの高層化によって増加する杭の支持力と地震時及び暴風時に発生する引抜力に対応するため、杭の先端部を拡幅して底面積を大きくして支持力を増大させ、かつ、拡幅部を孔軸方向に長く形成してより大きな摩擦力を取るようにしている。
これにより、杭の先端部が軸部よりも拡大していて底面積が大きいため、地盤反力を有効に利用することができ、かつ、拡幅部の表面積が軸部の表面積に比べてかなり広いことにより、多くの摩擦力を取ることができ、したがって、杭先端の地耐力と大きな周面摩擦力を加えた支持力だけでなく、大きな周面摩擦力からより大きな引抜抵抗力も得られることになる。 In order to cope with the bearing capacity of piles and the pulling force generated during earthquakes and storms due to the building's high rise, the pile tip is widened to increase the bottom area and the bearing capacity is increased. Is formed longer in the hole axis direction so as to take a larger frictional force.
As a result, since the tip of the pile is larger than the shaft and the bottom area is large, the ground reaction force can be used effectively, and the surface area of the widened portion is considerably larger than the surface area of the shaft. Therefore, it is possible to take a lot of frictional force, and therefore, not only the bearing strength of the pile tip and the large peripheral frictional force but also the larger peripheral frictional force can be obtained. Become.

アースドリル工法における従来の拡幅掘削装置として、下記特許文献１に記載のものがある。
この拡幅掘削装置は、杭孔を掘削するバケットと、該バケットの上方に出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔拡幅部の上部斜面部を掘削する斜面部拡幅ブレードと、バケットから出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔の拡幅部を掘削する立ち上り部拡幅ブレードとを備えている。 There exists a thing of the following patent document 1 as a conventional widening excavation apparatus in an earth drill construction method.
This widening excavation apparatus is provided with a bucket for excavating a pile hole, and a slope part for excavating an upper slope part of the pile hole widening part, which is provided so as to be able to protrude and retract above the bucket and protrudes outward from the excavation range of the bucket. A widening blade and a rising portion widening blade that is provided so as to be able to appear and retract from the bucket and that projects outward from the excavation range of the bucket to excavate the widened portion of the pile hole.

この拡幅掘削装置は、杭孔を所定の深さまで掘削した後、前記バケットを杭孔に挿入し、斜面部拡幅ブレードを開いて杭孔拡幅部の上部斜面部を掘削するとともに、立ち上り部拡幅ブレードを開いて杭孔の拡幅部を掘削する。   In this widening excavator, after excavating a pile hole to a predetermined depth, the bucket is inserted into the pile hole, the slope part widening blade is opened to excavate the upper slope part of the pile hole widening part, and the rising part widening blade To open the widened part of the pile hole.

ところで、このような拡幅掘削において、杭孔の拡幅部を孔軸方向に長く形成し、場所打ちコンクリート杭の拡底部を大きくしたい場合がある。具体的には、杭１本当たりの長さが支持層深さで決まった場合において、拡幅部の最大地盤反力と周面摩擦だけでは杭の支持力と引抜抵抗力が不足するときに、孔軸方向に長く拡幅部を形成することにより、杭周面の摩擦をより大きく取ることができるようにし、限られた杭の長さのもとで今まで以上の杭の支持力と、今まで以上の杭の引抜抵抗力が得られるようにする。
しかしながら、上記従来の拡幅掘削装置では、立ち上り部拡幅ブレードが杭孔の底部で拡開しながら拡幅掘削を行うことから、この立ち上り部拡幅ブレードの高さ分しか拡幅部を掘削することができず、上記のような場合に対応できないという問題があった。
特公平６−１３８２７号公報 By the way, in such widening excavation, there is a case in which the widened portion of the pile hole is formed long in the hole axis direction and the bottom expanded portion of the cast-in-place concrete pile is desired to be enlarged. Specifically, when the length per pile is determined by the depth of the support layer, the support force of the pile and the pulling resistance force are insufficient only by the maximum ground reaction force and circumferential friction of the widened portion. By forming the widened part long in the hole axis direction, it is possible to take more friction on the periphery of the pile. Make sure that the pile pull-out resistance is greater than that.
However, in the conventional widening excavator, since the rising part widening blade performs widening excavation while expanding at the bottom of the pile hole, the widening part can be excavated only by the height of the rising part widening blade. There was a problem that it was not possible to cope with the above case.
Japanese Patent Publication No. 6-13827

本発明は、上記従来の拡幅掘削装置が有する問題点に鑑み、杭孔の拡幅部を容易かつ自在に孔軸方向に長く形成することができる拡幅掘削方法を提供することを目的とする。 In view of the problems of the conventional widening rig it has for its object to provide an expansion width drilling method a widened portion of Kuiana can be formed easily and freely in Anajiku direction longer.

上記目的を達成するため、本第１発明の拡幅掘削方法は、掘削バケットを備えた孔掘削装置と、バケット及び該バケットに水平方向に出没可能に設けられた、下部に掘削爪を備えるとともにバケットの掘削範囲から外側に突出することにより杭孔の拡幅部を掘削する拡幅ブレードを備えた拡幅掘削装置と、バケット、該バケットの上方に出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔拡幅部の上部斜面部を掘削する掘削爪が設けられている斜面部拡幅ブレード及びバケットから出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔の拡幅部を掘削する掘削爪が設けられている立ち上り部拡幅ブレードを備えた補助拡幅掘削装置とを併用する拡幅掘削方法であって、表層ケーシングの建て込み位置から築造する杭の拡幅部の上端位置まで孔掘削装置により杭孔を掘削し、補助拡幅掘削装置を杭孔に挿入し、築造する杭の拡幅部の上端位置で杭孔に拡幅部の上部斜面部を掘削した後、前記拡幅掘削装置を杭孔に挿入し、上部斜面部の下で拡幅ブレードを突出状態にして築造する杭の底部位置まで拡幅掘削を行い、その後、補助拡幅掘削装置を杭孔に挿入し、拡幅部の底部を拡幅掘削することを特徴とする。 In order to achieve the above object, a widening excavation method according to the first aspect of the present invention includes a hole excavation apparatus provided with an excavation bucket, a bucket and an excavation claw provided at the lower portion thereof so as to be able to appear and retract in the horizontal direction, and a bucket. A widening excavator provided with a widening blade for excavating the widened portion of the pile hole by projecting outward from the excavation range of the bucket, and a bucket, which is provided so as to be able to appear above and below the bucket, and projects outward from the excavation range of the bucket The pile hole widening portion is provided so as to be able to protrude and retract from the bucket widening blade and bucket, where the excavation claw for excavating the upper slope portion of the pile hole widening portion is provided, and protruding outward from the bucket excavation range. part a widening excavation method using both the auxiliary widening drilling apparatus having a rising portion widening blade excavation teeth are provided for drilling, the surface casing It drilled Kuiana by the upper end position to the hole drilling apparatus from the lump position of the widening section of the pile of construction Te, an auxiliary widening rigs inserted into Kuiana, widened Kuiana at the upper end position of the widened portion of the pile of construction After excavating the upper slope part of the part, the widening excavator is inserted into the pile hole, and the widening excavation is performed to the bottom position of the pile to be built with the widening blade protruding under the upper slope part, and then the auxiliary widening A drilling device is inserted into the pile hole, and the bottom of the widened portion is widened and excavated.

また、本第２発明の拡幅掘削方法は、掘削バケットを備えた孔掘削装置と、バケット及び該バケットに水平方向に出没可能に設けられた、下部に掘削爪を備えるとともにバケットの掘削範囲から外側に突出することにより杭孔の拡幅部を掘削する拡幅ブレードを備えた拡幅掘削装置と、バケット、該バケットの上方に出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔拡幅部の上部斜面部を掘削する掘削爪が設けられている斜面部拡幅ブレード及びバケットから出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔の拡幅部を掘削する掘削爪が設けられている立ち上り部拡幅ブレードを備えた補助拡幅掘削装置とを併用する拡幅掘削方法であって、表層ケーシングの建て込み位置から築造する杭の底部位置まで孔掘削装置により杭孔を掘削し、補助拡幅掘削装置を杭孔に挿入し、築造する杭の拡幅部の上端位置で杭孔に拡幅部の上部斜面部を掘削した後、前記拡幅掘削装置を杭孔に挿入し、上部斜面部の下で拡幅ブレードを突出状態にして築造する杭の底部位置まで拡幅掘削を行い、その後、補助拡幅掘削装置を杭孔に挿入し、拡幅部の底部を拡幅掘削することを特徴とする。 Further, the widening excavation method of the second invention includes a hole excavation apparatus provided with an excavation bucket, an excavation claw provided at a lower portion of the bucket and capable of moving in and out in the horizontal direction, and an outer side from the excavation range of the bucket. A widening excavator provided with a widening blade for excavating the widened portion of the pile hole by projecting into the bucket, a bucket, provided so as to be able to appear above and below the bucket, and projecting outward from the excavation range of the bucket, Excavation that excavates the widened part of the pile hole by projecting outward from the excavation range of the bucket, which is provided so as to be able to protrude from the bucket widening blade and bucket provided with excavation claws for excavating the upper inclined part of the widened part a widening excavation method using both the auxiliary widening drilling apparatus having a rising portion widening blade pawl is provided, built from like an anchor position of the surface casing The bottom position to the hole drilling apparatus of piles for drilling Kuiana, auxiliary widening rigs inserted into Kuiana was drilled upper sloped portion of the widened portion in Kuiana at the upper end position of the widened portion of the pile of construction After that, the widening excavator is inserted into the pile hole, the widening excavation is performed to the bottom of the pile to be built with the widening blade protruding under the upper slope, and then the auxiliary widening excavator is inserted into the pile hole. The bottom of the widened portion is widened and excavated.

また、本第３発明の拡幅掘削方法は、掘削バケットを備えた孔掘削装置と、バケット及び該バケットに水平方向に出没可能に設けられた、下部に掘削爪を備えるとともにバケットの掘削範囲から外側に突出することにより杭孔の拡幅部を掘削する拡幅ブレードを備えた拡幅掘削装置と、バケット、該バケットの上方に出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔拡幅部の上部斜面部を掘削する掘削爪が設けられている斜面部拡幅ブレード及びバケットから出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔の拡幅部を掘削する掘削爪が設けられている立ち上り部拡幅ブレードを備えた補助拡幅掘削装置とを併用する拡幅掘削方法であって、表層ケーシングの建て込み位置から築造する杭の底部位置まで孔掘削装置により杭孔を掘削し、補助拡幅掘削装置を杭孔に挿入し、築造する杭の拡幅部の上端位置で杭孔に拡幅部の上部斜面部を掘削した後、さらに、底部状の拡幅部を掘削することを繰り返して杭孔の中間部に節形状の拡幅部を２箇所以上形成した後、前記拡幅掘削装置を杭孔に挿入し、一番上の上部斜面部の下で拡幅ブレードを突出状態にして、築造する杭の底部位置まで拡幅掘削を行い、その後、補助拡幅掘削装置を杭孔に挿入し、拡幅部の底部を拡幅掘削することを特徴とする。 Further, the widening excavation method of the third invention includes a hole excavation apparatus provided with an excavation bucket, an excavation claw provided at a lower portion of the bucket and capable of moving in and out in the horizontal direction, and an outer side from the excavation range of the bucket. A widening excavator provided with a widening blade for excavating the widened portion of the pile hole by projecting into the bucket, a bucket, provided so as to be able to appear above and below the bucket, and projecting outward from the excavation range of the bucket, Excavation that excavates the widened part of the pile hole by projecting outward from the excavation range of the bucket, which is provided so as to be able to protrude from the bucket widening blade and bucket provided with excavation claws for excavating the upper inclined part of the widened part a widening excavation method using both the auxiliary widening drilling apparatus having a rising portion widening blade pawl is provided, built from like an anchor position of the surface casing The bottom position to the hole drilling apparatus of piles for drilling Kuiana, auxiliary widening rigs inserted into Kuiana was drilled upper sloped portion of the widened portion in Kuiana at the upper end position of the widened portion of the pile of construction After that, after further excavating the bottom-shaped widened portion to form two or more node-shaped widened portions in the middle of the pile hole, the widened excavator is inserted into the pile hole, Widening excavation to the bottom position of the pile to be built with the widening blade projecting under the upper slope part, then inserting an auxiliary widening excavator into the pile hole and widening excavation at the bottom of the widening part And

本発明の拡幅掘削方法によれば、下部に掘削爪を備えるとともに、バケットの掘削範囲から外側に突出することにより、杭孔の拡幅部を掘削する拡幅ブレードを前記バケットに水平方向に出没可能に設けた拡幅掘削装置を用い、補助拡幅掘削装置により杭孔に拡幅部の上部斜面部を掘削した後、前記拡幅掘削装置を杭孔に挿入し、上部斜面部の下で拡幅ブレードを突出状態にして築造する杭の底部位置まで拡幅掘削を行うことができ、これにより、杭孔の拡幅部を容易かつ自在に孔軸方向に長く形成することができる。 According to expand the width drilling method of the present invention, infested provided with a drilling nail at the bottom, by protruding outward from the drilling bucket scope a widening blade drilling a widened portion of Kuiana the bucket horizontal direction Using the widening excavator provided as possible, after excavating the upper slope part of the widened part into the pile hole with the auxiliary widening excavator, insert the widened excavator into the pile hole and project the widening blade under the upper slope part The widening excavation can be performed up to the bottom position of the pile to be built in a state, whereby the widened portion of the pile hole can be easily and freely formed long in the hole axis direction.

この場合、補助拡幅掘削装置を杭孔に挿入し、杭孔に拡幅部の上部斜面部と底部状の拡幅部とを掘削することを繰り返して杭孔の中間部に節形状の拡幅部を２箇所以上形成することにより、予備的な拡幅掘削を事前に行うことによって、拡幅ブレードによる拡幅掘削を容易に行うことができる。   In this case, an auxiliary widening excavator is inserted into the pile hole, and excavation of the upper slope portion of the widened portion and the bottom widened portion is repeated in the pile hole, so that a nodal widened portion is formed in the middle portion of the pile hole. By forming more than one place, widening excavation with the widening blade can be easily performed by performing preliminary widening excavation in advance.

以下、本発明の拡幅掘削方法の実施の形態を、図面に基づいて説明する。 Hereinafter, the embodiments of the expansion width drilling method of the present invention will be described with reference to the drawings.

図１〜図２に、本発明の拡幅掘削方法に用いる拡幅掘削装置の一実施例を示す。 1 to 2 show an embodiment of a widening excavator used in the widening excavation method of the present invention.

この拡幅掘削装置Ａは、杭孔Ｋを掘削するバケット１を備えた拡幅掘削装置において、下部に掘削爪２１を備えるとともに、バケット１の掘削範囲から外側に突出することにより、杭孔の拡幅部Ｋ１を掘削する拡幅ブレード２を前記バケット１に略水平方向に出没可能に設けている。   This widening excavator A is a widening excavator provided with a bucket 1 for excavating a pile hole K. The widening excavator A has a excavation claw 21 at the lower part and projects outward from the excavation range of the bucket 1, thereby widening the pile hole. A widening blade 2 for excavating K1 is provided in the bucket 1 so as to be able to appear and retract in a substantially horizontal direction.

バケット１は、底板に左右対照に切欠部を設け、夫々に底渫え板によって底渫えできるように構成し、シャッターやフィシュテール等を備えた公知の構造からなる。
このバケット１は、伸縮し回転駆動するケリーバー３に着脱可能に取り付けられ、地盤を掘削することができる。 The bucket 1 is provided with a notch portion on the bottom plate for left and right contrast, and is configured so that each bottom can be supported by a bottom plate, and has a known structure including a shutter, a fishtail, and the like.
The bucket 1 is detachably attached to a kelly bar 3 that expands and contracts and rotates, and can excavate the ground.

拡幅ブレード２は、バケット１の上面に固定された取付板２３に配設した軸２ａに、水平面状で揺動可能に枢着された１対のものからなり、油圧シリンダ２２の伸縮によって開閉し、図１（ａ）及び図２（ａ）に示すように、バケット１の掘削範囲から外側に突出する掘削状態と、図１（ｂ）及び図２（ｂ）に示すように、バケット１の掘削範囲内に収まる収納状態とを呈する。
なお、拡幅ブレード２には、下部と掘削方向の面とにそれぞれ掘削爪２１が設けられている。
この場合、拡幅ブレード２は、鉛直方向の軸２ａに水平面状で揺動可能に枢着されることから、偏荷重を受けにくく、また、バケット１の掘削範囲から外側に突出する掘削状態において、ストッパ２４によって背面を支持されることと相俟って、強固な構造とすることができる。 The widening blade 2 is composed of a pair of pivots pivotably mounted in a horizontal plane on a shaft 2 a disposed on a mounting plate 23 fixed to the upper surface of the bucket 1, and opens and closes by expansion and contraction of the hydraulic cylinder 22. As shown in FIGS. 1 (a) and 2 (a), the excavation state protruding outward from the excavation range of the bucket 1, and as shown in FIGS. 1 (b) and 2 (b) The storage state is within the excavation range.
The widening blade 2 is provided with excavation claws 21 at the lower portion and the surface in the excavation direction.
In this case, since the widening blade 2 is pivotally attached to the vertical shaft 2a so as to be swingable in a horizontal plane, the widening blade 2 is less likely to receive an unbalanced load, and in the excavation state protruding outward from the excavation range of the bucket 1, Combined with the fact that the back surface is supported by the stopper 24, a strong structure can be obtained.

一方、図３〜図４を参照して、本実施例の拡幅掘削装置Ａと共に使用する補助拡幅掘削装置Ｂを説明する。
この補助拡幅掘削装置Ｂは、バケット１ｂの上方に出没可能に設けられ、バケット１ｂの掘削範囲から外側に突出することにより、杭孔拡幅部の上部斜面部Ｋ２を掘削する斜面部拡幅ブレード４と、バケット１ｂから出没可能に設けられ、バケット１ｂの掘削範囲から外側に突出することにより、杭孔Ｋの拡幅部Ｋ１を掘削する立ち上り部拡幅ブレード５とを備えている。
斜面部拡幅ブレード４及び立ち上り部拡幅ブレード５には、それぞれ掘削爪４１、５１が設けられている。
この補助拡幅掘削装置Ｂは、通常のバケット１ａにより杭孔を所定の深さまで掘削した後、この補助拡幅掘削装置Ｂのバケット１ｂを杭孔に挿入し、斜面部拡幅ブレード４を開いて杭孔拡幅部の上部斜面部Ｋ２を掘削するとともに、立ち上り部拡幅ブレード５を開いて杭孔の底部Ｋ３を掘削することができる。 On the other hand, with reference to FIGS. 3-4, the auxiliary | assistant widening excavation apparatus B used with the widening excavation apparatus A of a present Example is demonstrated.
This auxiliary widening excavation apparatus B is provided so as to be able to appear above and below the bucket 1b, and protrudes outward from the excavation range of the bucket 1b, whereby a slope widening blade 4 for excavating the upper slope K2 of the pile hole widening part, And a rising portion widening blade 5 for excavating the widened portion K1 of the pile hole K by protruding outward from the excavation range of the bucket 1b.
Excavation claws 41 and 51 are provided on the slope portion widening blade 4 and the rising portion widening blade 5, respectively.
This auxiliary widening excavator B excavates a pile hole to a predetermined depth with a normal bucket 1a, then inserts the bucket 1b of this auxiliary widening excavator B into the pile hole, opens the slope widening blade 4 and opens the pile hole While excavating the upper slope portion K2 of the widened portion, the rising portion widening blade 5 can be opened to excavate the bottom portion K3 of the pile hole.

次に、本発明の拡幅掘削方法の第１実施例について説明する。
まず、図５（ａ）〜（ｂ）に示すように、表層ケーシング６を建て込み、通常のバケット１ａにより杭孔Ｋの軸部を掘削する。
次に、図５（ｃ）に示すように、補助拡幅掘削装置Ｂのバケット１ｂを杭孔に挿入し、斜面部拡幅ブレード４を開いて上部斜面部Ｋ２を掘削する。 Next, a first embodiment of the widening excavation method of the present invention will be described.
First, as shown to Fig.5 (a)-(b), the surface casing 6 is built and the axial part of the pile hole K is excavated with the normal bucket 1a.
Next, as shown in FIG.5 (c), the bucket 1b of the auxiliary widening excavation apparatus B is inserted in a pile hole, the slope part widening blade 4 is opened, and the upper slope part K2 is excavated.

次に、図５（ｄ）に示すように、本実施例の拡幅掘削装置Ａを杭孔Ｋに挿入し、上部斜面部Ｋ２の下で拡幅ブレード２を突出状態にして所定深度まで拡幅掘削を行う。
その後、図５（ｅ）に示すように、再び補助拡幅掘削装置Ｂのバケット１ｂを杭孔Ｋに挿入し、立ち上り部拡幅ブレード５を開いて拡幅部Ｋ１の底部Ｋ３を拡幅掘削するようにする。 Next, as shown in FIG.5 (d), the widening excavation apparatus A of a present Example is inserted in the pile hole K, and the widening blade 2 protrudes under the upper slope part K2, and widening excavation to predetermined depth is carried out. Do.
After that, as shown in FIG. 5 (e), the bucket 1b of the auxiliary widening excavator B is inserted into the pile hole K again, and the rising part widening blade 5 is opened to widen the bottom K3 of the widening part K1. .

杭孔Ｋの掘削後は、図６（ａ）に示すように、１次スライム処理を行い、図６（ｂ）に示すように、鉄筋籠８とトレミー管９を建て込み、２次スライム処理を行うようにする。   After excavation of the pile hole K, as shown in FIG. 6 (a), the primary slime treatment is performed, and as shown in FIG. 6 (b), the reinforcing bar 8 and the tremy pipe 9 are built, and the secondary slime treatment is performed. To do.

次に、図６（ｃ）〜（ｄ）に示すように、トレミー管９を引き抜きながらコンクリート７を打設し、その後、埋め戻して表層ケーシング６を引き抜く。   Next, as shown in FIGS. 6C to 6D, the concrete 7 is placed while the tremy tube 9 is pulled out, and then backfilled, and the surface casing 6 is pulled out.

この場合、図７（ｂ）〜（ｃ）に示す、本発明の拡幅掘削方法の第２実施例のように、通常のバケット１ａにより杭孔の軸部を拡幅部Ｋ１の底まで掘削しておき、その後、図７（ｄ）に示すように、補助拡幅掘削装置Ｂのバケット１ｂを杭孔に所定深度まで挿入し、斜面部拡幅ブレード４を開いて拡幅部Ｋ１の上部斜面部Ｋ２を掘削するようにすることもできる。   In this case, as in the second embodiment of the widening excavation method of the present invention shown in FIGS. 7B to 7C, the shaft portion of the pile hole is excavated to the bottom of the widening portion K1 by the normal bucket 1a. Then, as shown in FIG. 7 (d), the bucket 1b of the auxiliary widening excavator B is inserted into the pile hole to a predetermined depth, and the slope widening blade 4 is opened to excavate the upper slope K2 of the widening K1. You can also do it.

そして、図７（ｅ）に示すように、本実施例の拡幅掘削装置Ａを杭孔に挿入し、上部斜面部Ｋ２の下で拡幅ブレード２を突出状態にして所定深度まで拡幅掘削を行い、その後、図７（ｆ）に示すように、再び補助拡幅掘削装置Ｂのバケット１ｂを杭孔に挿入し、立ち上り部拡幅ブレード５を開いて拡幅部Ｋ１の底部Ｋ３を拡幅掘削する。   And as shown in FIG.7 (e), the widening excavation apparatus A of a present Example is inserted in a pile hole, the widening blade 2 is protruded under the upper slope part K2, and widening excavation is performed to a predetermined depth, Thereafter, as shown in FIG. 7 (f), the bucket 1b of the auxiliary widening excavator B is again inserted into the pile hole, the rising portion widening blade 5 is opened, and the bottom K3 of the widening portion K1 is widened and excavated.

また、図８（ａ）〜（ｈ）に示す、本発明の拡幅掘削方法の第３実施例のように、補助拡幅掘削装置Ｂにより杭孔Ｋに拡幅部Ｋ１の上部斜面部Ｋ２と底部状の拡幅部Ｋ４（拡幅部Ｋ１の上部斜面部状の拡幅部Ｋ５と底部状の拡幅部Ｋ４（拡幅部Ｋ１の底部Ｋ３））とを掘削することを繰り返して杭孔の中間部に節形状の拡幅部を２箇所以上（本実施例においては、３箇所）形成することにより予備的な拡幅掘削を事前に行った後、拡幅掘削装置Ａを杭孔に挿入し、一番上の上部斜面部Ｋ２の下で拡幅ブレード２を突出状態にして、所定深度（本実施例においては、一番下の節形状の拡幅部）まで拡幅掘削を行い、その後、補助拡幅掘削装置Ｂを杭孔Ｋに挿入し、拡幅部Ｋ１の底部Ｋ３（本実施例においては、一番下の節形状の拡幅部と共通）を拡幅掘削するようにすることもできる。   Moreover, like the 3rd Example of the widening excavation method of this invention shown to Fig.8 (a)-(h), upper slope part K2 of the widening part K1 and bottom part shape to the pile hole K by the auxiliary widening excavation apparatus B are shown. Of the widened portion K4 (the widened portion K5 of the upper slope portion of the widened portion K1 and the widened portion K4 of the bottom portion (the bottom K3 of the widened portion K1)) are repeatedly excavated to form a node-shaped portion in the middle portion of the pile hole After the preliminary widening excavation is performed in advance by forming two or more widening portions (three in this embodiment), the widening excavator A is inserted into the pile hole, and the upper upper slope portion The widening blade 2 is protruded under K2, and widening excavation is performed to a predetermined depth (in the present embodiment, the lowermost node-shaped widening portion). Thereafter, the auxiliary widening excavator B is turned into the pile hole K. Inserted, the bottom K3 of the widened portion K1 (in this embodiment, common to the widest portion of the lowermost node shape) It can also be made to widening drilling.

かくして、本実施例の拡幅掘削装置及び該掘削装置を用いた拡幅掘削方法は、下部に掘削爪２１を備えるとともに、バケット１の掘削範囲から外側に突出することにより、杭孔の拡幅部Ｋ１を掘削する拡幅ブレード２を前記バケット１に略水平方向に出没可能に設けた拡幅掘削装置Ａを用い、補助拡幅掘削装置Ｂにより杭孔に拡幅部Ｋ１の上部斜面部Ｋ２を掘削した後、前記拡幅掘削装置Ａを杭孔に挿入し、上部斜面部Ｋ２の下で拡幅ブレード２を突出状態にして所定深度まで拡幅掘削を行うことができ、これにより、杭孔の拡幅部Ｋ１を容易かつ自在に孔軸方向に長く形成することができる。   Thus, the widening excavation apparatus of this embodiment and the widening excavation method using the excavation apparatus are provided with the excavation claw 21 at the lower part and projecting outward from the excavation range of the bucket 1, so that the widened portion K1 of the pile hole is formed. After using the widening excavator A in which the widening blade 2 to be excavated is provided in the bucket 1 so as to be able to appear and retract in a substantially horizontal direction, the auxiliary widening excavator B excavates the upper slope K2 of the widened portion K1 in the pile hole, and then the widening The excavator A can be inserted into the pile hole, and the widening blade 2 can be protruded under the upper slope portion K2 to perform widening excavation to a predetermined depth, thereby making the widening portion K1 of the pile hole easy and free. It can be formed long in the hole axis direction.

この場合、補助拡幅掘削装置Ｂを杭孔に挿入し、杭孔Ｋに拡幅部Ｋ１の上部斜面部Ｋ２と底部状の拡幅部Ｋ４（拡幅部Ｋ１の上部斜面部状の拡幅部Ｋ５と底部状の拡幅部Ｋ４（拡幅部Ｋ１の底部Ｋ３））とを掘削することを繰り返して杭孔Ｋの中間部に節形状の拡幅部を２箇所以上形成することにより、予備的な拡幅掘削を事前に行うことによって、拡幅ブレード２による拡幅掘削を容易に行うことができる。   In this case, the auxiliary widening excavator B is inserted into the pile hole, and the upper slope portion K2 of the widening portion K1 and the bottom-like widening portion K4 (the widening portion K5 and the bottom-like widening portion of the upper slope portion of the widening portion K1) are inserted into the pile hole K. The widening portion K4 (bottom portion K3 of the widening portion K1) is repeatedly excavated to form two or more knot-shaped widening portions in the middle portion of the pile hole K, thereby performing preliminary widening excavation in advance. By performing, widening excavation by the widening blade 2 can be performed easily.

以上、本発明の拡幅掘削方法について、その実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、実施例に記載した構成を適宜組み合わせるなど、その趣旨を逸脱しない範囲において適宜その構成を変更することができる。 Although the expansion width drilling method of the present invention have been described based on the embodiments, the present invention is not limited to the configuration described in the above examples, such as combine configuration described in Example appropriate, The configuration can be changed as appropriate without departing from the spirit of the invention.

本発明の拡幅掘削方法は、杭孔の拡幅部を容易かつ自在に孔軸方向に長く形成することができることから、例えば、拡底部を大きく形成するような場所打ちコンクリート杭の用途に好適に用いることができる。 Expanding the width drilling method of the present invention, since it is possible to increase forming a widened portion of Kuiana easily and freely Anajiku direction, for example, suitably for applications place concrete pile that increases form拡底portion Can be used.

本発明の拡幅掘削方法に用いる拡幅掘削装置を示し、（ａ）は拡幅ブレードを突出した状態を示す一部断面正面図、（ｂ）は拡幅ブレードを収納した状態を示す一部断面正面図である。The widening excavation apparatus used for the widening excavation method of this invention is shown, (a) is a partial cross section front view which shows the state which protruded the widening blade, (b) is a partial cross section front view which shows the state which accommodated the widening blade. is there. 同実施例の拡幅掘削装置を示し、（ａ）は拡幅ブレードを突出した状態を示す平面図、（ｂ）は拡幅ブレードを収納した状態を示す平面図である。The widening excavator of the same Example is shown, (a) is a top view which shows the state which protruded the widening blade, (b) is a top view which shows the state which accommodated the widening blade. 本発明の拡幅掘削方法に用いる補助拡幅掘削装置を示し、（ａ）は斜面部拡幅ブレードを開いた状態を示す断面正面図、（ｂ）は同断面平面図である。 The auxiliary | assistant widening excavation apparatus used for the widening excavation method of this invention is shown, (a) is a cross-sectional front view which shows the state which opened the slope part widening blade, (b) is the cross-sectional top view. 同補助拡幅掘削装置を示し、（ａ）は立ち上り部拡幅ブレードを開いた状態を示す断面正面図、（ｂ）は同断面平面図である。The auxiliary | assistant widening excavation apparatus is shown, (a) is a cross-sectional front view which shows the state which opened the rising part widening blade, (b) is the cross-sectional top view. 本発明の拡幅掘削方法の第１実施例を示す工程図である。It is process drawing which shows 1st Example of the widening excavation method of this invention. 同実施例の拡幅掘削方法を示す工程図である。It is process drawing which shows the widening excavation method of the Example. 本発明の拡幅掘削方法の第２実施例を示す工程図である。It is process drawing which shows 2nd Example of the widening excavation method of this invention. 本発明の拡幅掘削方法の第３実施例を示す工程図である。It is process drawing which shows 3rd Example of the widening excavation method of this invention.

１ バケット
１ａ バケット
１ｂ バケット
２ 拡幅ブレード
２１ 掘削爪
２２ 油圧シリンダ
３ ケリーバー
４ 斜面部拡幅ブレード
５ 立ち上り部拡幅ブレード
６ 表層ケーシング
７ コンクリート
８ 鉄筋籠
９ トレミー管
Ａ 拡幅掘削装置
Ｂ 拡幅掘削装置
Ｋ 杭孔
Ｋ１ 拡幅部
Ｋ２ 上部斜面部
Ｋ３ 底部
Ｋ４ 底部状の拡幅部
Ｋ５ 上部斜面部状の拡幅部 DESCRIPTION OF SYMBOLS 1 Bucket 1a Bucket 1b Bucket 2 Widening blade 21 Excavation claw 22 Hydraulic cylinder 3 Kelly bar 4 Slope widening blade 5 Standing widening blade 6 Surface casing 7 Concrete 8 Rebar rod 9 Tremy pipe A Widening excavator B Widening excavator K Pile hole K1 Widening part K2 Upper slope part K3 Bottom part K4 Wide part of bottom part K5 Wide part of upper slope part

Claims (3)

掘削バケットを備えた孔掘削装置と、バケット及び該バケットに水平方向に出没可能に設けられた、下部に掘削爪を備えるとともにバケットの掘削範囲から外側に突出することにより杭孔の拡幅部を掘削する拡幅ブレードを備えた拡幅掘削装置と、バケット、該バケットの上方に出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔拡幅部の上部斜面部を掘削する掘削爪が設けられている斜面部拡幅ブレード及びバケットから出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔の拡幅部を掘削する掘削爪が設けられている立ち上り部拡幅ブレードを備えた補助拡幅掘削装置とを併用する拡幅掘削方法であって、表層ケーシングの建て込み位置から築造する杭の拡幅部の上端位置まで孔掘削装置により杭孔を掘削し、補助拡幅掘削装置を杭孔に挿入し、築造する杭の拡幅部の上端位置で杭孔に拡幅部の上部斜面部を掘削した後、前記拡幅掘削装置を杭孔に挿入し、上部斜面部の下で拡幅ブレードを突出状態にして築造する杭の底部位置まで拡幅掘削を行い、その後、補助拡幅掘削装置を杭孔に挿入し、拡幅部の底部を拡幅掘削することを特徴とする拡幅掘削方法。 Drilling the widened part of the pile hole by providing a hole drilling device with a drilling bucket, a bucket and a drilling claw at the lower part that can be projected and lowered in the horizontal direction, and projecting outward from the bucket excavation range A widening excavator provided with a widening blade , a bucket, a excavation claw for excavating the upper slope portion of the pile hole widening portion by protruding outward from the excavation range of the bucket. It is provided with a rising part widening blade provided with excavation claws for excavating the widened part of the pile hole by protruding outward from the excavation range of the bucket, provided so as to be able to protrude from the inclined part widening blade and bucket. auxiliary widened drilling rig and a widened drilling method used in combination, the hole to the upper end position of the widened portion of the pile to construction from like an anchor position of the surface casing drilling Drilled Kuiana by the device, an auxiliary widening rigs inserted into Kuiana, after drilling an upper inclined surface portion widening in Kuiana at the upper end position of the widened portion of the pile of construction, the widening rigs Kuiana To the bottom of the pile to be built with the widening blade protruding under the upper slope, and then the auxiliary widening excavator is inserted into the pile hole to widen the bottom of the widening part. A widening excavation method characterized by that. 掘削バケットを備えた孔掘削装置と、バケット及び該バケットに水平方向に出没可能に設けられた、下部に掘削爪を備えるとともにバケットの掘削範囲から外側に突出することにより杭孔の拡幅部を掘削する拡幅ブレードを備えた拡幅掘削装置と、バケット、該バケットの上方に出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔拡幅部の上部斜面部を掘削する掘削爪が設けられている斜面部拡幅ブレード及びバケットから出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔の拡幅部を掘削する掘削爪が設けられている立ち上り部拡幅ブレードを備えた補助拡幅掘削装置とを併用する拡幅掘削方法であって、表層ケーシングの建て込み位置から築造する杭の底部位置まで孔掘削装置により杭孔を掘削し、補助拡幅掘削装置を杭孔に挿入し、築造する杭の拡幅部の上端位置で杭孔に拡幅部の上部斜面部を掘削した後、前記拡幅掘削装置を杭孔に挿入し、上部斜面部の下で拡幅ブレードを突出状態にして築造する杭の底部位置まで拡幅掘削を行い、その後、補助拡幅掘削装置を杭孔に挿入し、拡幅部の底部を拡幅掘削することを特徴とする拡幅掘削方法。 Drilling the widened part of the pile hole by providing a hole drilling device with a drilling bucket, a bucket and a drilling claw at the lower part that can be projected and lowered in the horizontal direction, and projecting outward from the bucket excavation range A widening excavator provided with a widening blade , a bucket, and a excavation claw for excavating the upper slope portion of the pile hole widening portion by projecting outward from the excavation range of the bucket. It is provided with a rising part widening blade provided with excavation claws that excavate the widened part of the pile hole by projecting outward from the excavation range of the bucket, provided so as to be able to protrude from the bucket widening blade and bucket a widening excavation method using both the auxiliary widened drilling apparatus, the hole drilling apparatus to the bottom position of the pile to construction from like an anchor position of the surface casing Drilling Rikuiana, auxiliary widening rigs inserted into Kuiana, after Kuiana drilled the upper sloped portion of the widened portion at the upper end position of the widened portion of the pile of construction, the widening rigs to Kuiana Insert and perform widening excavation to the bottom of the pile to be built with the widening blade projecting under the upper slope, and then insert an auxiliary widening excavator into the pile hole to widen the bottom of the widening Widening excavation method characterized by 掘削バケットを備えた孔掘削装置と、バケット及び該バケットに水平方向に出没可能に設けられた、下部に掘削爪を備えるとともにバケットの掘削範囲から外側に突出することにより杭孔の拡幅部を掘削する拡幅ブレードを備えた拡幅掘削装置と、バケット、該バケットの上方に出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔拡幅部の上部斜面部を掘削する掘削爪が設けられている斜面部拡幅ブレード及びバケットから出没可能に設けられ、バケットの掘削範囲から外側に突出することにより、杭孔の拡幅部を掘削する掘削爪が設けられている立ち上り部拡幅ブレードを備えた補助拡幅掘削装置とを併用する拡幅掘削方法であって、表層ケーシングの建て込み位置から築造する杭の底部位置まで孔掘削装置により杭孔を掘削し、補助拡幅掘削装置を杭孔に挿入し、築造する杭の拡幅部の上端位置で杭孔に拡幅部の上部斜面部を掘削した後、さらに、底部状の拡幅部を掘削することを繰り返して杭孔の中間部に節形状の拡幅部を２箇所以上形成した後、前記拡幅掘削装置を杭孔に挿入し、一番上の上部斜面部の下で拡幅ブレードを突出状態にして、築造する杭の底部位置まで拡幅掘削を行い、その後、補助拡幅掘削装置を杭孔に挿入し、拡幅部の底部を拡幅掘削することを特徴とする拡幅掘削方法。 Drilling the widened part of the pile hole by providing a hole drilling device with a drilling bucket, a bucket and a drilling claw at the lower part that can be projected and lowered in the horizontal direction, and projecting outward from the bucket excavation range A widening excavator provided with a widening blade , a bucket, and a excavation claw for excavating the upper slope portion of the pile hole widening portion by projecting outward from the excavation range of the bucket. It is provided with a rising part widening blade provided with excavation claws that excavate the widened part of the pile hole by projecting outward from the excavation range of the bucket, provided so as to be able to protrude from the bucket widening blade and bucket a widening excavation method using both the auxiliary widened drilling apparatus, the hole drilling apparatus to the bottom position of the pile to construction from like an anchor position of the surface casing Drilling Rikuiana, auxiliary widening rigs inserted into Kuiana, after drilling an upper inclined surface portion widening in Kuiana at the upper end position of the widened portion of the pile to construction, further, the bottom shape of the widening section After repeating the excavation to form two or more knot-shaped widening parts in the middle part of the pile hole, insert the widening excavator into the pile hole and project the widening blade under the top upper slope part A widening excavation method characterized by performing widening excavation to a bottom position of a pile to be built and then inserting an auxiliary widening excavator into the pile hole to widen excavate the bottom of the widening portion.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155493A (en) * 1981-03-18 1982-09-25 Komatsu Mfg Co Ltd Method of forming uneven hole for frictional pile
JPH05321559A (en) * 1992-05-19 1993-12-07 Michio Tanaka Pile skeleton expander for site-cast concrete pile
JP2000160976A (en) * 1998-11-27 2000-06-13 Nikko Kensetsu Kk Vertical hole excavator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155493A (en) * 1981-03-18 1982-09-25 Komatsu Mfg Co Ltd Method of forming uneven hole for frictional pile
JPH05321559A (en) * 1992-05-19 1993-12-07 Michio Tanaka Pile skeleton expander for site-cast concrete pile
JP2000160976A (en) * 1998-11-27 2000-06-13 Nikko Kensetsu Kk Vertical hole excavator

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