JP2006118215A - Construction method of enlarged head pile - Google Patents

Construction method of enlarged head pile Download PDF

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JP2006118215A
JP2006118215A JP2004307242A JP2004307242A JP2006118215A JP 2006118215 A JP2006118215 A JP 2006118215A JP 2004307242 A JP2004307242 A JP 2004307242A JP 2004307242 A JP2004307242 A JP 2004307242A JP 2006118215 A JP2006118215 A JP 2006118215A
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excavation
drilling
pile
hole
diameter
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JP4372661B2 (en
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Hiroshi Wakiya
泰士 脇屋
Shinji Horikawa
慎司 堀川
Tetsuhiro Mimura
哲弘 三村
Kazuo Fukuda
一夫 福田
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JFE Steel Corp
Geotop Corp
Nozaki Kenko KK
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JFE Steel Corp
Geotop Corp
Nozaki Kenko KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for easily constructing an enlarged head pile from a precast pile by a preboring method. <P>SOLUTION: In this construction method, an excavated hole is formed beforehand by the preboring method, and the enlarged head pile formed of the precast pile is buried in the excavated hole. As an excavating rod for excavating the excavated hole, the projecting quantity of an agitation blade 8 provided at a rod portion corresponding to the height of an excavated hole part where the enlarged head pile is disposed, is set relatively large. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、プレボーリング工法による、杭頭部が拡頭した既製杭である拡頭杭を施工する方法に関する。   The present invention relates to a method for constructing a head-expanded pile, which is a ready-made pile with an expanded head, by a pre-boring method.

プレボーリング工法において、掘削ロッドで形成する掘削穴の途中若しくは上部を拡径する施工方法としては、例えば特許文献１や特許文献２に記載されているものがある。これらの施工方法では、先端部に拡大ビットを設けた掘削ロッドによって、目的の深さまで掘削した後、上記拡大ビットによって掘削穴の最下部で拡大掘削を実施して拡大根固め部を形成する。その後に、上記掘削ロッドを引き抜く。   In the pre-boring method, a construction method for expanding the diameter of the middle or upper part of the excavation hole formed by the excavation rod includes, for example, those described in Patent Document 1 and Patent Document 2. In these construction methods, after excavating to a target depth with an excavating rod provided with an enlarged bit at the tip, an enlarged excavation is performed at the lowermost part of the excavation hole with the enlarged bit to form an enlarged rooted portion. Thereafter, the drill rod is pulled out.

この引き抜き作業において、上記特許文献では、上記掘削ロッドの先端部に設けた拡大ビットが拡径する深さまで引き抜かれたときに、掘削ロッドを逆回転させて拡大ビットを拡径して掘削し、その部分の掘削穴の径を大きくする。すなわち、拡大根固め部の拡径作業と同様な発想で、例えば上部についても拡径ビットで拡径作業を実施している。
ここで、通常、複数の掘削ロッド部材を順次継ぎ足して所定の深さまで掘削するが、一回の施工で使用される全ての掘削ロッド部材として、同一種類の掘削ロッド部材が使用される。すなわち、同径の掘削ロッド部材を順次継ぎ足して目的の深さの掘削穴を形成する。 In this drawing work, in the above-mentioned patent document, when the expansion bit provided at the tip of the excavation rod is pulled out to a depth that expands the diameter, the excavation rod is reversely rotated to expand the expansion bit and excavate, Increase the diameter of the drilling hole in that part. That is, with the same idea as the diameter expansion work of the enlarged root part, for example, the diameter expansion work is performed on the upper part with a diameter expansion bit.
Here, normally, a plurality of excavation rod members are sequentially added to excavate to a predetermined depth, but the same type of excavation rod members are used as all excavation rod members used in one construction. That is, excavation rod members having the same diameter are sequentially added to form an excavation hole having a desired depth.

また、目的の深さまで掘削した後に、掘削ロッドを引き抜く際には、掘削作業の際とは逆に、順次、上側の掘削ロッド部材を外しながら、引き抜き作業を行うこととなる。
特開昭６２−２５３８１７号公報 特開２００３−１１９７７５号公報 In addition, when the excavation rod is pulled out after excavation to the target depth, the extraction operation is performed while sequentially removing the upper excavation rod member, contrary to the excavation operation.
JP 62-253817 A JP 2003-119775 A

ここで、上記掘削ロッドによる掘削作業は、最上部に位置する掘削ロッド部材に対し回転駆動部９を連結して、該回転駆動部９からのトルクによって掘削ロッドを回転して掘削が行われる。このため、掘削時には、掘削ロッド部材を継ぎ足すたびに、新たに最上部に位置することとなった掘削ロッド部材の上部と回転駆動部９との連結作業が行われることとなるが、通常、掘削ロッドの引き抜き作業の際には、掘削が不要であることから、掘削ロッド部材を順次、外す際に、新たに最上端に位置することとなった掘削ロッド部材の上部と回転駆動部９との連結作業を行う必要がない。   Here, the excavation work by the excavation rod is performed by connecting the rotation drive unit 9 to the excavation rod member located at the uppermost portion and rotating the excavation rod by the torque from the rotation drive unit 9. For this reason, at the time of excavation, each time the excavation rod member is added, the connection operation between the upper part of the excavation rod member that has been newly positioned at the uppermost portion and the rotation drive unit 9 is performed. When the excavation rod is pulled out, no excavation is required. Therefore, when the excavation rod members are sequentially removed, the upper portion of the excavation rod member, which is newly positioned at the uppermost end, and the rotation drive unit 9 It is not necessary to perform the connecting work.

これに対し、上記従来の施工方法では、一旦、目的の深さまで掘削した後に、順次掘削ロッド部材を外しながら掘削ロッドを引き抜き、最下部にある拡大ビットが掘削穴の上部まで来たときに改めて掘削作業を行う必要がある結果、掘削穴の上部を拡大掘削する際には、その時点で、掘削ロッドの上部と回転駆動部９との連結作業が要求される。
また、上部での拡大掘削は、根固め部での拡大掘削とは異なり、一旦所定の径まで掘削が完了した軟らかい部分で行われるために、拡大ビットの拡径が機械式の場合には、反力がうまくとれずに拡大ビットの開閉がうまくいかないおそれがある。
さらに、拡大ビットの拡大翼のみで拡大掘削部分を充分に混合攪拌するには、多くの上下反復が必要となり施工時間が長くなる。
本発明は、上記のような点に着目したもので、プレボーリング工法にて簡易に既製杭からなる拡頭杭を施工できることを課題としている。 On the other hand, in the above conventional construction method, after excavating once to the target depth, the excavation rod is pulled out while sequentially removing the excavation rod members, and when the enlarged bit at the bottom reaches the upper part of the excavation hole, it is renewed. As a result of the necessity of performing excavation work, when the upper part of the excavation hole is enlarged and excavated, the connection work between the upper part of the excavation rod and the rotary drive unit 9 is required at that time.
In addition, the expansion drilling at the upper part is different from the expansion drilling at the root consolidation part, and is performed in a soft part once the drilling is completed to a predetermined diameter. There is a risk that the opening and closing of the enlarged bit may not be successful because the reaction force cannot be taken well.
Furthermore, in order to sufficiently mix and agitate the enlarged excavated portion with only the enlarged blade of the enlarged bit, many up-and-down repetitions are required and the construction time becomes longer.
This invention pays attention to the above points, and makes it a subject to be able to construct the head-expansion pile which consists of ready-made piles easily by a pre-boring method.

上記課題を解決するために、本発明のうち請求項１に記載した発明は、掘削ロッドで所定の深さまでプレボーリングを行って掘削穴を形成し、その掘削穴に対し、頭部の径が拡径した既製杭からなる拡頭杭を建て込む拡頭杭の施工方法であって、
上記掘削ロッドは、上記拡頭杭の拡径した頭部の埋設位置の掘削穴を拡径形成する上側の掘削ロッド部分の攪拌翼が、それよりも下側の掘削ロッド部分の攪拌翼よりも突出長さが長いことを特徴とするものである。 In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention forms a drilling hole by performing preboring to a predetermined depth with a drilling rod, and the diameter of the head is relative to the drilling hole. It is a construction method of a head-expanded pile that builds a head-expanded pile made of an expanded ready-made pile,
In the drilling rod, the stirring blade of the upper drilling rod portion that expands the drilling hole at the buried position of the enlarged head of the heading pile protrudes from the stirring blade of the lower drilling rod portion. It is characterized by a long length.

次に、請求項２に記載した発明は、請求項１に記載した構成に対し、上記上側の掘削ロッド部分の最下部に位置する攪拌翼における、少なくとも上記下側の掘削ロッド部分の攪拌翼よりも外方に突出した部分に対し、下方に突出する掘削刃を設けたことを特徴とするものである。
次に、請求項３に記載した発明は、請求項１又は請求項２に記載した構成に対し、掘削ロッドの先端部から掘削液若しくは固化剤を掘削穴に注入しながら掘削若しくは攪拌を行う拡頭杭の施工方法において、
上記上側の掘削ロッド部分からも掘削液若しくは固化剤を上記掘削穴に注入しながら掘削若しくは攪拌を行うことを特徴とするものである。 Next, the invention described in claim 2 is based on the configuration described in claim 1 and includes at least a stirring blade of the lower excavation rod portion in the stirring blade located at the lowermost portion of the upper excavation rod portion. Also, a drilling blade that protrudes downward is provided for the portion that protrudes outward.
Next, the invention described in claim 3 is a head expansion that performs excavation or stirring with respect to the configuration described in claim 1 or claim 2 while injecting drilling fluid or solidifying agent into the drilling hole from the tip of the drilling rod. In the pile construction method,
Drilling or stirring is performed while injecting drilling fluid or a solidifying agent into the drilling hole from the upper drilling rod.

本発明によれば、既製杭からなる拡頭杭を建て込むための掘削穴を、通常の施工で使用される設備を使用して、簡易かつ効率的に施工するとができる。   ADVANTAGE OF THE INVENTION According to this invention, it can be simply and efficiently constructed the excavation hole for building the head-expansion pile which consists of ready-made piles using the equipment used by normal construction.

次に、本発明の実施形態を図面を参照しつつ説明する。
図１は、本実施形態に係る施工手順を示す図である。
本実施形態の施工で使用する掘削ロッド３は、下側の第１掘削ロッド部材１と、その上側に連結される第２掘削ロッド部材２とから構成される（図１（ｃ）などを参照）。
第１掘削ロッド部材１は、先端に対し当該先端から下方に突出する掘削刃としての掘削用のビット４が取り付けられると共に、先端部に公知の拡大ビット５が設けられている。さらに、第１掘削ロッド部材１の側面には軸方向に沿って、アジテータと呼ばれる複数の攪拌翼６が設けられている。この攪拌翼６の突出量が拡頭杭の小径部より若干径が大きい量となっている、掘削ロッド部材を使用する。 Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a construction procedure according to the present embodiment.
The excavation rod 3 used in the construction of the present embodiment is composed of a lower first excavation rod member 1 and a second excavation rod member 2 connected to the upper side thereof (see FIG. 1C and the like). ).
The first excavation rod member 1 is provided with an excavation bit 4 as an excavation blade protruding downward from the distal end with respect to the distal end, and a known enlarged bit 5 is provided at the distal end. Furthermore, a plurality of stirring blades 6 called agitators are provided on the side surface of the first excavation rod member 1 along the axial direction. A drilling rod member is used in which the amount of protrusion of the stirring blade 6 is slightly larger than the small diameter portion of the expanded pile.

なお、第１掘削ロッド部材１の先端部には、従来と同様に、液を噴出可能な噴出孔１２が設けられていて、その噴出孔１２から掘削液や固化剤を掘削穴１０内に注入可能となっている。なお、固化剤としては、セメントミルクが最も良く使われるので、セメントミルクを用いた場合で説明する。
また、第２掘削ロッド部材２は、その側面に対し軸方向に沿って複数の攪拌翼７，８が設けられている。この第２掘削ロッド部材２の攪拌翼７，８のうち、第１掘削ロッド部材１の先端部が目的の深さまで掘削したときに拡頭杭の拡頭部の埋設位置（拡頭部のための拡大掘削が要求される位置）に位置するはずの上側の攪拌翼８は、図２に示すように、その下側の攪拌翼７よりも突出量が大きく設定されており、上記拡頭杭の拡頭部の径よりも若干径が大きくなるように設定されている。下側の攪拌翼７の突出量は、上記第１掘削ロッド部材１の攪拌翼６と同じ突出量となっている。すなわち、第２掘削ロッド部材２の径は、下側が第１掘削ロッド部材1 と同径となっているが、上側は、当該第１掘削ロッド部材１より大径となっている。 The tip of the first excavation rod member 1 is provided with an ejection hole 12 through which liquid can be ejected, as in the prior art, and the drilling fluid and solidifying agent are injected into the excavation hole 10 from the ejection hole 12. It is possible. As the solidifying agent, cement milk is most often used, so the case where cement milk is used will be described.
Moreover, the 2nd excavation rod member 2 is provided with the some stirring blades 7 and 8 along the axial direction with respect to the side surface. Of the stirring blades 7 and 8 of the second excavation rod member 2, when the tip of the first excavation rod member 1 is excavated to a target depth, the position where the head extension of the head extension pile is buried (expanded excavation for head extension) As shown in FIG. 2, the upper agitating blade 8 that should be positioned at a position) is set to have a protruding amount larger than that of the lower agitating blade 7, and The diameter is set to be slightly larger than the diameter. The amount of protrusion of the lower stirring blade 7 is the same as the amount of protrusion of the stirring blade 6 of the first excavation rod member 1. That is, the diameter of the second excavation rod member 2 is the same as that of the first excavation rod member 1 on the lower side, but the diameter on the upper side is larger than that of the first excavation rod member 1.

そして、上記第２掘削ロッド部材２における、上記突出量が大きく設定された攪拌翼８部分が、上側の攪拌ロッド部分を構成する。
ここで、下記の説明において、攪拌翼を区別する場合には、相対的に突出量が小さな攪拌翼６，７を小径攪拌翼と、相対的に突出量が大きな攪拌翼８を大径攪拌翼と呼ぶ。
上記突出量が大きく設定された大径攪拌翼８のうち、最下部に位置する大径攪拌翼８には、図２に示すように、その下側の小径攪拌翼７よりも突出した外周部分に対し下方に突出する１又は２以上の掘削ビット１１が掘削刃として設けられている。 And the stirring blade 8 part by which the said protrusion amount was set large in the said 2nd excavation rod member 2 comprises an upper stirring rod part.
Here, in the following description, when the stirring blades are distinguished, the stirring blades 6 and 7 having a relatively small protruding amount are used as the small-diameter stirring blade, and the stirring blade 8 having a relatively large protruding amount is used as the large-diameter stirring blade. Call it.
Among the large-diameter agitating blades 8 set to have a large protruding amount, the large-diameter agitating blade 8 positioned at the lowermost part has an outer peripheral portion that projects beyond the lower-diameter agitating blade 7 as shown in FIG. On the other hand, one or more excavation bits 11 projecting downward are provided as excavation blades.

さらに、上記第２掘削ロッド部材２における上記掘削ビット１１が設けられた高さ位置にも、液を噴出可能な上側噴出孔１３が設けられている。この上側噴出孔１３は、図面では軸部に設けてあるが、大径攪拌翼８の外周側に開口させても良い。また、上記上側噴出孔１３に液を供給するパイプ等からなる通路は、上記第１掘削ロッド部材１の噴出孔１２に液を供給する通路を共用しても良いし、別途個別の通路を設けても良い。なお、上記通路は、掘削ロッド３の軸部内を上下に延在するように設けられる。   Furthermore, an upper ejection hole 13 through which liquid can be ejected is also provided at a height position where the excavation bit 11 is provided in the second excavation rod member 2. The upper ejection hole 13 is provided in the shaft portion in the drawing, but may be opened on the outer peripheral side of the large-diameter stirring blade 8. In addition, the passage composed of a pipe or the like for supplying the liquid to the upper ejection hole 13 may share the passage for supplying the liquid to the ejection hole 12 of the first excavation rod member 1 or may be provided with a separate passage. May be. In addition, the said channel | path is provided so that the inside of the axial part of the excavation rod 3 may be extended up and down.

次に、上記図１を参照しつつ本実施形態の施工例を説明する。
まず、図１（ａ）に示すように、第１掘削ロッド部材１の上部を、掘削機の回転駆動部９に連結して、掘削作業を開始する。すなわち、図１（ｂ）に示すように、回転駆動部９を駆動して掘削ロッド３を回転させて、先端部の掘削ビット４で掘削していく。このとき、掘削ロッド４の先端部の噴出孔１２からセメントミルクを掘削穴１０に注入しながら掘削を行う。 Next, a construction example of this embodiment will be described with reference to FIG.
First, as shown to Fig.1 (a), the upper part of the 1st excavation rod member 1 is connected with the rotation drive part 9 of an excavator, and excavation work is started. That is, as shown in FIG. 1B, the rotation drive unit 9 is driven to rotate the excavation rod 3, and excavation is performed with the excavation bit 4 at the tip. At this time, excavation is performed while cement milk is injected into the excavation hole 10 from the ejection hole 12 at the tip of the excavation rod 4.

上記第１掘削ロッド部材１で所定深さまで掘削したら、その第１掘削ロッド部材１の上部に第２掘削ロッド部材２を連結すると共に、その第２掘削ロッド部材２の上部に上記回転駆動部９を連結し直して掘削を続行する（図１（ｃ）参照）。
このとき、最下部に位置する大径攪拌翼８の外周側には、ビット１１が設けられていることから、先に掘削された穴の外周部が当該ビット１１によって拡大掘削される。またこのとき、第２掘削ロッド部材２の位置からもセメントミルクを掘削穴１０に注入して、拡径した掘削穴１０上部でも必要なだけのセメントミルクを供給するようにする。 When the first excavation rod member 1 excavates to a predetermined depth, the second excavation rod member 2 is connected to the upper portion of the first excavation rod member 1, and the rotation drive unit 9 is connected to the upper portion of the second excavation rod member 2. Are connected again to continue excavation (see FIG. 1C).
At this time, since the bit 11 is provided on the outer peripheral side of the large-diameter agitating blade 8 positioned at the lowermost part, the outer peripheral portion of the previously excavated hole is expanded and excavated by the bit 11. At this time, cement milk is also injected into the excavation hole 10 from the position of the second excavation rod member 2 so that only the necessary amount of cement milk is supplied even at the upper part of the expanded excavation hole 10.

次に、図１（ｄ）のように、掘削ロッドを回転させながら所定ストロークだけ当該掘削ロッドを上下動させて、注入したセメントミルクと土砂とを攪拌混練してソイルセメントにする。
続いて、図１（ｅ）のように、拡大ビットを拡径して掘削穴１０の下端部を拡径して根固め球根部１０ｂを形成する。
上記のように掘削が完了したら、図１（ｆ）のように、掘削ロッド１を引き抜き、第２掘削ロッド部材２が地上部に全部引き抜けたら、第２掘削ロッド部材２を外して、続いて第１掘削ロッド部材１を引き抜く。
続いて、図１（ｇ）及び（ｈ）のように、順次、拡頭杭２０を、自重沈設及び回転埋沈によって、上記形成した掘削穴１０内に建て込んでいく。なお、本実施形態では、拡頭杭が２本の既製杭２０Ａ、２０Ｂからなる場合を例示している。 Next, as shown in FIG. 1 (d), the excavation rod is moved up and down by a predetermined stroke while rotating the excavation rod, and the injected cement milk and earth and sand are agitated and kneaded to form a soil cement.
Subsequently, as shown in FIG. 1 (e), the diameter of the enlarged bit is increased and the lower end portion of the excavation hole 10 is expanded to form a rooted bulb portion 10 b.
When excavation is completed as described above, as shown in FIG. 1 (f), the excavation rod 1 is pulled out, and when the second excavation rod member 2 is completely pulled out to the ground, the second excavation rod member 2 is removed, and then Then, the first excavation rod member 1 is pulled out.
Subsequently, as shown in FIGS. 1 (g) and (h), the head-expanded pile 20 is sequentially built into the excavated hole 10 formed by its own weight subsidence and rotary subsidence. In addition, in this embodiment, the case where a head expansion pile consists of two ready-made piles 20A and 20B is illustrated.

上述のように、本実施形態では、掘削ロッド１の上側に設ける大径攪拌翼８の突出量を大きくすることで、１回の掘削によって上部の拡大掘削もできる。
また、大径攪拌翼８の外周側にもビット１１を設けることで効率良く掘削穴１０の上部の拡大掘削が可能となる。なお、ビット１１を設けなくとも良いが、その分、大径攪拌翼８の強度を高めて確実に拡大掘削を可能とする必要がある。 As described above, in this embodiment, by expanding the protruding amount of the large-diameter agitating blade 8 provided on the upper side of the excavating rod 1, the upper enlarged excavation can be performed by one excavation.
Further, by providing the bit 11 also on the outer peripheral side of the large-diameter stirring blade 8, it is possible to efficiently perform the enlarged excavation above the excavation hole 10. Although the bit 11 need not be provided, it is necessary to increase the strength of the large-diameter agitating blade 8 and to make sure that expanded excavation is possible.

また、掘削穴１０の上部は突出量の大きな大径攪拌翼８で改めて拡大掘削されるが、掘削ロッド先端部の噴出孔１２から注入されるセメントミルクが当該拡大掘削された上側の拡径部分１０ａに供給され難い。このため、そのままでは土砂の割合が相対的に多くなることで泥土の品質が悪くなって上部での強度がその分悪くなるが、本実施形態では、第２掘削ロッド部材２からもセメントミルクを噴出することで、新たに拡大掘削された土砂分のセメントミルクが掘削穴１０の上部にも適正に供給可能となる。この結果、掘削穴１０の上部を拡大掘削しても充分な品質のソイルセメントを確保することができる。   Further, the upper portion of the excavation hole 10 is enlarged and excavated again by the large-diameter agitating blade 8 having a large protruding amount, but the upper diameter enlarged portion where the cement milk injected from the ejection hole 12 at the tip of the excavation rod is expanded and excavated. It is difficult to supply to 10a. Therefore, as it is, the proportion of the earth and sand is relatively increased, so that the quality of the mud is deteriorated and the strength at the upper part is deteriorated accordingly. In the present embodiment, the cement milk is also removed from the second excavation rod member 2. By ejecting, the cement milk of the newly expanded excavated soil can be properly supplied to the upper part of the excavation hole 10. As a result, even if the upper part of the excavation hole 10 is expanded and excavated, a sufficient quality soil cement can be secured.

ここで、下側の噴出孔１２と上側の噴出孔１３とに対し共通の通路を通じてセメントミルクを供給する構成とし、両噴出孔１２，１３の孔径を同一とした場合には、下側の土圧の方が高い分だけ上側の噴出孔１３から多量に噴出することとなる。これを考慮して、土圧に応じて適正な量のセメントミルクがそれぞれの噴出孔１２，１３から噴出するように、例えば、上側の噴出孔１３を相対的に小径としたり絞りを設けたりして、下側の噴出孔１２よりも上側の噴出孔１３の抵抗を大きくしておくことが好ましい。   Here, when the cement milk is supplied to the lower ejection hole 12 and the upper ejection hole 13 through a common passage and the diameters of both the ejection holes 12 and 13 are the same, the lower soil As the pressure is higher, a larger amount is ejected from the upper ejection hole 13. In consideration of this, for example, the upper ejection hole 13 is made to have a relatively small diameter or a restriction so that an appropriate amount of cement milk is ejected from the ejection holes 12 and 13 according to the earth pressure. Thus, it is preferable to increase the resistance of the upper ejection hole 13 relative to the lower ejection hole 12.

また、上記実施形態では、第２掘削ロッド部材２の攪拌翼７，８が、上側と下側とで異なる場合を例示しているが、これに限定されない。例えば、突出量が大きい大径攪拌翼８だけの掘削ロッド部材と、小径攪拌翼６，７だけの複数の掘削ロッド部材を使用して、上部に連結し、拡大掘削を行う掘削ロッド部材として突出量が大きい大径攪拌翼８だけの掘削ロッド部材を使用するようにしても良い。   Moreover, in the said embodiment, although the case where the stirring blades 7 and 8 of the 2nd excavation rod member 2 differ by upper side and lower side is illustrated, it is not limited to this. For example, by using a drilling rod member having only a large-diameter stirring blade 8 having a large protruding amount and a plurality of drilling rod members having only a small-diameter stirring blade 6, 7, it is connected to the upper part and protrudes as a drilling rod member that performs expanded drilling You may make it use the excavation rod member only of the large diameter stirring blade 8 with a large quantity.

なお、上記拡頭杭２０は、鋼管製でもコンクリート製でも、既製杭であれば特に拘らない。
また、掘削ロッド３の攪拌翼として、上記小径及び大径攪拌翼６，７，８以外の副次的な攪拌翼であって、上記攪拌翼６，７，８よりも小さな小径のものが設けられている場合もある。
また、上記実施形態では、掘削時のセメントミルクを掘削穴１０に注入するように説明しているが、掘削時には、水などの掘削液を注入し、混合・攪拌時にセメントミルクを注入するようにしても良い。 The head expansion pile 20 is not particularly limited as long as it is a ready-made pile, whether it is made of steel pipe or concrete.
Further, as the stirring blade of the excavating rod 3, a secondary stirring blade other than the above-mentioned small diameter and large diameter stirring blades 6, 7, 8 and having a smaller diameter than the stirring blades 6, 7, 8 are provided. In some cases.
Further, in the above embodiment, the explanation is made so that the cement milk at the time of excavation is injected into the excavation hole 10, but at the time of excavation, the excavating liquid such as water is injected, and the cement milk is injected at the time of mixing and stirring. May be.

本発明に基づく実施形態に係る拡頭杭の施工方法を説明する図である。It is a figure explaining the construction method of the head extension pile which concerns on embodiment based on this invention. 第２掘削ロッド部材を説明する図である。It is a figure explaining a 2nd excavation rod member.

符号の説明Explanation of symbols

１ 第１掘削ロッド部材
２ 第２掘削ロッド部材
３ 掘削ロッド
４ 掘削用ビット
５ 拡大ビット
６、７ 小径攪拌翼
８ 大径攪拌翼
９ 回転駆動部
１０ 掘削穴
１０ａ 拡径部
１０ｂ 根固め球根部
１１ ビット
１２ 下側の噴出孔
１３ 上側の噴出孔
２０ 拡頭杭 DESCRIPTION OF SYMBOLS 1 1st excavation rod member 2 2nd excavation rod member 3 Excavation rod 4 Excavation bit 5 Expansion bit 6, 7 Small diameter agitating blade 8 Large diameter agitating blade 9 Rotation drive part 10 Excavation hole 10a Wide diameter part 10b Rooted bulb part 11 Bit 12 Lower jet hole 13 Upper jet hole 20 Expanded pile

Claims (3)

掘削ロッドで所定の深さまでプレボーリングを行って掘削穴を形成し、その掘削穴に対し、頭部の径が拡径した既製杭からなる拡頭杭を建て込む拡頭杭の施工方法であって、
上記掘削ロッドは、上記拡頭杭の拡径した頭部の埋設位置の掘削穴を拡径形成する上側の掘削ロッド部分の攪拌翼が、それよりも下側の掘削ロッド部分の攪拌翼よりも突出長さが長いことを特徴とする拡頭杭の施工方法。 Pre-boring to a predetermined depth with a drilling rod to form a drilling hole, and with respect to the drilling hole, a method for constructing a head-expanded pile that builds a head-expanded pile made of a ready-made pile with an enlarged head diameter,
In the drilling rod, the stirring blade of the upper drilling rod portion that expands the drilling hole at the buried position of the enlarged head of the heading pile protrudes from the stirring blade of the lower drilling rod portion. A method for constructing an expanded pile characterized by its long length. 上記上側の掘削ロッド部分の最下部に位置する攪拌翼における、少なくとも上記下側の掘削ロッド部分の攪拌翼よりも外方に突出した部分に対し、下方に突出する掘削刃を設けたことを特徴とする請求項１に記載した拡頭杭の施工方法。   In the stirring blade located at the lowermost part of the upper excavation rod part, a drilling blade that protrudes downward is provided for at least a part of the lower excavation rod part that protrudes outward from the stirring blade. The construction method of the expansion pile according to claim 1. 掘削ロッドの先端部から掘削液若しくは固化剤を掘削穴に注入しながら掘削若しくは攪拌を行う拡頭杭の施工方法において、
上記上側の掘削ロッド部分からも掘削液若しくは固化剤を上記掘削穴に注入しながら掘削若しくは攪拌を行うことを特徴とする請求項１又は請求項２に記載した拡頭杭の施工方法。 In the construction method of the expanded pile that performs excavation or stirring while injecting the drilling fluid or solidifying agent into the drilling hole from the tip of the drilling rod,
The method for constructing a head pile according to claim 1 or 2, wherein excavation or agitation is performed while injecting a drilling fluid or a solidifying agent into the drilling hole also from the upper excavation rod portion.
JP2004307242A 2004-10-21 2004-10-21 Construction method of expansion head pile Active JP4372661B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008045327A (en) * 2006-08-15 2008-02-28 Japan Pile Corp Construction method for head-enlarged pile
JP2015096676A (en) * 2013-11-15 2015-05-21 三谷セキサン株式会社 Excavation method of pile hole having expanded head part
CN104674801A (en) * 2015-03-06 2015-06-03 邓亚光 Construction method of ultrahigh bearing capacity stiff composite pile
CN111851479A (en) * 2020-07-30 2020-10-30 陕西龙海新创基础工程有限公司 Method for constructing immersed tube rammed cast-in-place pile in sand layer or gravel layer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008045327A (en) * 2006-08-15 2008-02-28 Japan Pile Corp Construction method for head-enlarged pile
JP2015096676A (en) * 2013-11-15 2015-05-21 三谷セキサン株式会社 Excavation method of pile hole having expanded head part
CN104674801A (en) * 2015-03-06 2015-06-03 邓亚光 Construction method of ultrahigh bearing capacity stiff composite pile
CN111851479A (en) * 2020-07-30 2020-10-30 陕西龙海新创基础工程有限公司 Method for constructing immersed tube rammed cast-in-place pile in sand layer or gravel layer
WO2022021469A1 (en) * 2020-07-30 2022-02-03 陕西龙海新创基础工程有限公司 Method for constructing pipeline sinking rammed and expanded cast-in-situ pile in sand or gravel layer

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