JP4623574B2 - How to build a pile - Google Patents

How to build a pile Download PDF

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JP4623574B2
JP4623574B2 JP2005044220A JP2005044220A JP4623574B2 JP 4623574 B2 JP4623574 B2 JP 4623574B2 JP 2005044220 A JP2005044220 A JP 2005044220A JP 2005044220 A JP2005044220 A JP 2005044220A JP 4623574 B2 JP4623574 B2 JP 4623574B2
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pile
root
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liquid
hole
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JP2006226064A (en
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仁志 小椋
裕介 本間
佑二郎 田中
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Japan Pile Corp
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この発明は、杭の構築方法に関し、さらに詳細には、プレボーリング根固め工法による既製杭の埋込み工法及び場所打ち杭工法のそれぞれの欠点を排除し、利点のみを巧みに取り入れた新規な杭の構築方法に関する。   The present invention relates to a method for constructing a pile, and more specifically, a new pile that skillfully incorporates only the advantages by eliminating the respective disadvantages of the pre-boring root setting method and the existing pile embedding method and cast-in-place pile method. Concerning construction method.

杭基礎は施工法で分類すると、打込み杭工法、埋込み杭工法及び場所打ち杭工法に大別される。これら工法のうち打込み杭工法及び埋込み杭工法は既製杭を用いる工法であるが、前者は打込み時における騒音・振動の問題があることから、近年では後者の埋込み杭工法が適用されることが多い。   Pile foundations are roughly classified into driving pile method, embedding pile method and cast-in-place pile method. Of these methods, the driven pile method and the embedded pile method are methods that use off-the-shelf piles, but since the former has problems of noise and vibration during driving, the latter embedded pile method is often applied in recent years. .

この埋込み杭工法の１つとして、プレボーリング根固め工法がある。この工法は掘削した杭孔にセメントミルクやソイルセメントなどの根固め液、さらには必要に応じて杭周固定液を充填した後、杭孔にコンクリート杭や鋼管杭などの既製杭を建て込む工法である。   As one of the embedded pile methods, there is a pre-boring rooting method. In this method, the excavated pile hole is filled with a root hardening solution such as cement milk or soil cement, and if necessary, the periphery of the pile is fixed, and then a prefabricated pile such as a concrete pile or steel pipe pile is built in the pile hole. It is.

この工法は騒音・振動の問題を解消し、また施工性においても優れた工法であるが、次のような難点もある。すなわち、施工地盤によっては支持層深さが均一でないことがあり（不陸状態）、杭の天端高さの管理の問題が生じることがある。このような場合、杭頭部の切断や設計変更等を余儀なくされ、結果的に施工費用のコストアップにつながってしまう。   This method eliminates noise and vibration problems and is excellent in workability, but has the following disadvantages. That is, depending on the construction ground, the depth of the support layer may not be uniform (non-land state), and a problem of management of the top height of the pile may occur. In such a case, it is necessary to cut the pile head or change the design, resulting in an increase in construction costs.

一方、掘削した杭孔に鉄筋籠を建て込んだ後、コンクリートを打設する場所打ち杭工法も騒音・振動の問題がなく、加えて鉄筋籠は製造が簡単で、しかも長さの調整が容易であるという利点がある。しかし、場所打ち杭工法は杭体全体の品質を均一に管理することが難しく、特に杭下部において、杭孔底に堆積するスライムの影響の問題がある。すなわち、施工後に、このスライム層が圧密圧縮され、場所打ち杭そのものが沈下する問題がある。したがって、従来より、コンクリート打設前にこのスライムを除去することが行われることになっているが、目視できない杭孔底において確実に除去されているのか疑問視されているのが実情である。このスライムの影響を避けるための工法も提案されている（例えば特許文献１，２参照）。   On the other hand, the cast-in-place pile construction method, in which concrete is placed after the rebar is built in the excavated pile hole, has no noise and vibration problems, and in addition, the rebar is easy to manufacture and the length can be easily adjusted. There is an advantage of being. However, it is difficult for the cast-in-place pile method to uniformly control the quality of the entire pile body, and there is a problem of the effect of slime deposited on the bottom of the pile hole, especially at the bottom of the pile. That is, there is a problem that after construction, the slime layer is compacted and the cast-in-place pile itself sinks. Therefore, conventionally, this slime is supposed to be removed before placing concrete, but the fact is that it has been questioned whether it is surely removed at the bottom of the pile hole that cannot be seen. A construction method for avoiding the influence of this slime has also been proposed (see, for example, Patent Documents 1 and 2).

なお、その他、本件発明と関連する技術が記載された先行技術文献としては、特許文献３を挙げることができる。同文献に記載の技術は、杭孔に建て込む鉄筋籠として、その下端に鋼管あるいは既製コンクリート杭を予め連結したものを用いる技術である（同文献の第４，５図及び第９図参照）。
特開昭５２−４６０７号公報 実公平６−３２９８３号公報 特開昭６３−２２６４０８号公報 In addition, Patent Document 3 can be cited as a prior art document describing a technique related to the present invention. The technique described in this document is a technique that uses a steel pipe or a prefabricated concrete pile connected in advance to the lower end as a reinforcing bar to be built in a pile hole (see FIGS. 4, 5 and 9 in the same document). .
JP 52-4607 A No. 6-32983 JP 63-226408 A

この発明は上記のような技術的背景に基づいてなされたものであって、次の目的を達成するものである。
この発明の目的は、支持層が不陸状態の施工地盤であっても容易に対応することができ、加えてスライムの影響を無くして、高品質で深さ方向の杭径も任意に設計や調整ができる杭の構築方法を提供することにある。 The present invention has been made based on the technical background as described above, and achieves the following object.
The object of the present invention is that it can be easily handled even if the support layer is in a non-landing construction ground, in addition to eliminating the influence of slime, the pile diameter in the depth direction can be arbitrarily designed and high quality It is to provide a construction method of a pile that can be adjusted.

この発明は上記課題を達成するために、次のような手段を採用している。
すなわち、この発明は、杭孔を掘削する工程と、
前記杭孔の底部に根固め液を充填する工程と、
前記根固め液内に上端部が該根固め液から突出するように既製杭部材を建て込む工程と、
前記既製杭部材の少なくとも前記根固め液から突出する部分を取り囲むように、鉄筋籠を前記杭孔に建て込む工程と、
前記根固め液上の、前記既製杭部材の前記突出部分と前記鉄筋籠とが重なり合った部分にスライムが堆積するようにしてこれを除去することなく、前記杭孔内にコンクリートを打設する工程と
を備えてなる杭の構築方法にある。 The present invention employs the following means in order to achieve the above object.
That is, the present invention includes a step of excavating a pile hole,
Filling the root of the pile hole with root-setting liquid;
Building the ready-made pile member so that the upper end protrudes from the root-setting liquid into the root-setting liquid;
Building a steel bar in the pile hole so as to surround at least a portion of the ready-made pile member that protrudes from the root-setting liquid;
A step of placing concrete in the pile hole without removing the slime so that the protruding portion of the ready-made pile member and the reinforcing bar rod overlap each other on the root hardening liquid. It is in the construction method of the pile which comprises and.

上記杭構築方法において、前記鉄筋籠をその先端部が前記根固め液内に入り込むように建て込む態様を採ることができる。   The said pile construction method can take the aspect which builds in the said steel bar so that the front-end | tip part may enter in the said root hardening liquid.

また、上記杭構築方法において、前記根固め液の上方に杭周固定液を形成し、上端部が該杭周固定液から突出するように前記既製杭部材を前記根固め液及び前記杭周固定液内に建て込む態様を採ることもできる。この場合、前記鉄筋籠をその先端部が少なくとも前記杭周固定液内に入り込むように建て込む態様を採ることができる。   Moreover, in the said pile construction method, a pile periphery fixing liquid is formed above the said root solidification liquid, and the said ready-made pile member and the said pile periphery fixation are fixed so that an upper end part may protrude from this pile periphery fixing liquid. It is also possible to adopt a mode of being built in the liquid. In this case, it is possible to adopt a mode in which the reinforcing bar rod is built so that the tip end portion enters at least the pile circumference fixing liquid.

この発明によれば、杭体の下方部分が既製杭部分からなり上方部分が場所打ち杭部分からなるので、支持層が不陸状態の施工地盤であっても、場所打ち杭部分の長さを調整することにより容易に対応することができる。また、既製杭部分と場所打ち杭部分が重なっている箇所にスライム層が形成されるので、このスライム層の存在に関係なく鉛直荷重が場所打ち杭部分から既製杭部分に伝えられる。すなわち、スライムが収縮しても杭そのものがそれに連れて沈下する恐れは全くなく、高品質な杭体の構築方法及び杭構造を提供することができる。   According to this invention, since the lower part of the pile body consists of a pre-made pile part and the upper part consists of a cast-in-place pile part, even if the support layer is a non-land construction ground, the length of the cast-in-place pile part is reduced. It can be easily handled by adjusting. Moreover, since a slime layer is formed in the location where the ready-made pile part and the cast-in-place pile part overlap, a vertical load is transmitted from the cast-in-place pile part to the ready-made pile part irrespective of the presence of this slime layer. That is, even if the slime contracts, there is no fear that the pile itself will sink with it, and a high-quality method for constructing a pile body and a pile structure can be provided.

また、上記したように杭先端側においては、既製杭の優位性を生かして先端支持力を確保しながら、杭頭部側においては、場所打ち杭の優位性を生かして軸部を大径にしたり、鉄筋量を増加させて所望の水平耐力を確保するなど、杭として必要な性能を自由に設計に盛り込むことができる等の効果がある。   In addition, as described above, on the pile tip side, while making use of the superiority of ready-made piles to secure the tip support force, on the pile head side, making use of the advantage of cast-in-place piles, the shaft portion is made large in diameter. There is an effect that the required performance as a pile can be freely incorporated into the design, such as securing the desired horizontal strength by increasing the amount of reinforcing bars.

この発明の実施形態を図面を参照しながら以下に説明する。図１及び図２は、この発明による杭構築方法の実施形態を示す施工手順図である。まず、図１（ａ）に示すように、アースオーガ１などの掘削機により杭孔２を掘削する。この実施形態では、拡大根固め部とするために、先端に拡大掘削翼３が設けられたアースオーガ１が用いられている。なお、地盤状況によってはアースオーガ１の先端から掘削水を注出させながら掘削する場合もある。   Embodiments of the present invention will be described below with reference to the drawings. FIG.1 and FIG.2 is a construction procedure figure which shows embodiment of the pile construction method by this invention. First, as shown in FIG. 1A, a pile hole 2 is excavated by an excavator such as an earth auger 1. In this embodiment, an earth auger 1 with an enlarged excavating blade 3 provided at the tip is used in order to provide an enlarged root consolidation portion. Depending on the ground conditions, excavation may be performed while discharging the drilling water from the tip of the earth auger 1.

掘削深度が支持層４付近に到達したら、図１（ｂ）に示すように、拡大掘削翼３を拡大させ、支持層４において杭孔２の下端部を拡径して拡径孔２ａとする。次に、図１（ｃ）に示すように、アースオーガ１を引き上げながら、その先端からセメントミルクを注出して富配合の根固め液５を拡径孔２ａ内に充填する。さらに、アースオーガ１を引き上げながら、セメントミルクを注出し、掘削土と撹拌して、杭周固定液（ソイルセメント）６を形成する。その際、もちろん、先に杭周固定液６を形成してから、アースオーガ１の先端を拡径孔２ａ内の先端に臨ませ、セメントミルクを注出して先端部に富配合の根固め液５を設置させてもよい。また、空掘りした場合は、富配合の根固め液５のみを設置させ、杭周固定液を省略するか、杭周固定液として兼用してもよい。   When the excavation depth reaches the vicinity of the support layer 4, as shown in FIG. 1 (b), the enlarged excavation blade 3 is expanded, and the lower end portion of the pile hole 2 is expanded in the support layer 4 to be an enlarged diameter hole 2 a. . Next, as shown in FIG. 1 (c), while pulling up the earth auger 1, cement milk is poured out from the tip of the earth auger 1 and filled with a rich blend of root hardening liquid 5 into the enlarged diameter hole 2 a. Further, while pulling up the earth auger 1, cement milk is poured out and agitated with excavated soil to form a pile circumference fixing liquid (soil cement) 6. At that time, of course, the pile periphery fixing liquid 6 is first formed, and then the tip of the earth auger 1 is made to face the tip of the enlarged-diameter hole 2a, and cement milk is poured out to enrich the root-filling liquid with a rich blend at the tip. 5 may be installed. Moreover, when digging in the air, only the rich blending root-setting liquid 5 may be installed, and the pile circumference fixing liquid may be omitted, or the pile circumference fixing liquid may also be used.

次に、図１（ｄ）に示すように、根固め液５及び杭周固定液６内に既製杭部材７をその上端部が杭周固定液６（杭周固定液６を使用しない場合は根固め液５）から上方に突出するように建て込む。なお、この既製杭部材７は、コンクリート杭や鋼管杭などの既製杭と同様のもので、その上端部が杭周固定液６から杭孔２内に数十ｃｍ乃至数ｍ突出する短尺のものから、杭孔２の上部近傍乃至杭頭まで届く長尺なもの等が、必要に応じて採用できる。   Next, as shown in FIG.1 (d), when the upper end part is the pile circumference fixing liquid 6 (the pile circumference fixing liquid 6 is not used) in the root hardening liquid 5 and the pile circumference fixing liquid 6, the upper end part Install so as to protrude upward from the root hardening solution 5). This ready-made pile member 7 is the same as a ready-made pile such as a concrete pile or a steel pipe pile, and its upper end protrudes from the pile peripheral fixing liquid 6 into the pile hole 2 by several tens cm to several m. From the upper part of the pile hole 2, the long thing reaching the pile head can be adopted as necessary.

次に、図２（ｅ）に示すように、杭孔２に鉄筋籠８を建て込む。その際、鉄筋籠８の先端部が既製杭部材７の上端部を取り囲み、かつ、その先端部が杭周固定液６内に入り込むように配置させて建て込み、図２（ｆ）に示すように、杭孔２にコンクリート１０を打設する。つまり、既製杭部材７部分と、鉄筋籠８及びコンクリート１０からなる場所打ち杭部分とが重なり合うように杭を構築する。この重なり代（図３の符号Ｄ参照）が大きいほど、鉛直荷重は無理なく場所打ち杭部分から既製杭部分７に伝達されるが、経済的には鉛直荷重が十分伝達できる範囲で、重なり代を小さくした方がよい。   Next, as shown in FIG. 2 (e), a reinforcing bar 8 is built into the pile hole 2. At that time, the tip of the reinforcing bar 8 surrounds the upper end of the ready-made pile member 7, and the tip is placed so as to enter the pile periphery fixing liquid 6, and as shown in FIG. 2 (f). Next, the concrete 10 is placed in the pile hole 2. That is, the pile is constructed so that the ready-made pile member 7 portion and the cast-in-place pile portion made of the reinforcing bar 8 and the concrete 10 overlap. The larger the overlap allowance (see symbol D in FIG. 3), the more easily the vertical load is transmitted from the cast-in-place pile portion 7 to the ready-made pile portion 7. Should be smaller.

また、杭孔２内にベントナイト液を充填して施工する場合、スライム９が根固め液５上、又は、根固め液５上に杭周固定液６を形成したときはこの杭周固定液６上に堆積するので、このスライム９の堆積位置と厚さを想定して、重なり代をどの程度にするかを設計に含める必要がある。   In addition, when the pile hole 2 is filled with bentonite liquid, when the slime 9 forms the pile circumference fixing liquid 6 on the root hardening liquid 5 or on the root hardening liquid 5, this pile circumference fixing liquid 6 Since it accumulates on the top, it is necessary to include in the design how much the overlap margin should be, assuming the deposition position and thickness of the slime 9.

図３は、上記のような施工手順によって構築された杭１１の下部を示している。以下の説明では、根固め液５、杭周固定液６及びコンクリート１０がそれぞれ硬化したものを根固め層、杭周固定層、コンクリート層と称し、同一符号を用いることとする。   FIG. 3 shows the lower part of the pile 11 constructed by the construction procedure as described above. In the following description, what hardened the root hardening liquid 5, the pile circumference fixing liquid 6, and the concrete 10 is called a root hardening layer, a pile circumference fixed layer, and a concrete layer, and the same code | symbol shall be used.

上記のようにして構築された杭１１は、杭１１の下方部分Ａに従来のプレボーリング根固め工法による既製杭部分と同様の構造を持ち、また上方部分Ｂに場所打ち杭部分と同様の構造を持つこととなる。すなわち、場所打ち杭工法において、コンクリートの品質を均一に管理することが難しいとされた部分に既製杭部材７が配置されていることから、スライム９の影響は全く無く、不確実な部分の品質を補うことができる。   The pile 11 constructed as described above has a structure similar to that of an already-made pile part by the conventional pre-boring rooting method in the lower part A of the pile 11 and the same structure as the cast-in-place pile part in the upper part B. Will have. That is, in the cast-in-place pile method, since the ready-made pile member 7 is arranged in the portion where it is difficult to uniformly control the quality of the concrete, there is no influence of the slime 9 and the quality of the uncertain portion. Can be supplemented.

また、杭１１は単に既製杭部分Ａと場所打ち杭部分Ｂとからなるのではなく、鉄筋籠８と既製杭部材７とが重なり合っているので（重なり代をＤで示す）、この重なり合いによって両部分Ａ，Ｂが一体化し、鉛直荷重は場所打ち杭部分Ｂから既製杭部分Ｂに確実に伝達される。杭体の一体化を確実にするためには、既製杭部材７の上端部をコンクリート層１０内に入り込ませるだけでなく、さらには鉄筋籠８もその先端部を杭周固定層６（杭周固定層６を設けない場合は根固め層５）内に入り込ませることが望ましい。   In addition, the pile 11 is not simply composed of the ready-made pile portion A and the cast-in-place pile portion B, but the reinforcing bar 8 and the ready-made pile member 7 are overlapped (the overlap margin is indicated by D). The parts A and B are integrated, and the vertical load is reliably transmitted from the cast-in-place pile part B to the ready-made pile part B. In order to ensure the integration of the pile body, not only the upper end portion of the ready-made pile member 7 is allowed to enter the concrete layer 10, but also the reinforcing bar 8 has its tip portion fixed to the pile circumferential fixed layer 6 (pile circumference). In the case where the fixed layer 6 is not provided, it is preferable that the fixed layer 6 is allowed to enter the solidified layer 5).

また、上記のような杭１１によれば、支持層４に不陸状態があったとしても、場所打ち杭部分Ｂ（鉄筋籠８及びコンクリート層１０）の長さを調節することによって、設計値どおりの天端高さに管理施工することが可能となる。したがって、杭頭部の切断や設計変更というような施工費用のコストアップにつながる問題が生じることがない。逆に、設計変更があった場合でも、杭天端高さの変更に対応することが可能となる。   Further, according to the pile 11 as described above, even if the support layer 4 is in a non-landing state, the design value is obtained by adjusting the length of the cast-in-place pile portion B (reinforcing bar 8 and concrete layer 10). It becomes possible to carry out the management construction at the same top height. Therefore, the problem which leads to the cost increase of construction costs, such as cutting of a pile head and a design change, does not arise. Conversely, even when there is a design change, it is possible to cope with a change in pile top end height.

また、施工地盤や上部構造物の用途に応じて、既製杭部分と場所打ち杭部分の長さ関係を適宜変えることができる（図４（ａ），（ｂ）参照）。なお、既製杭部材７には根固め層５に位置する部分に突起、例えば節杭に形成されると同様の節部１２を設けることが望ましく、これにより既製杭部材７と根固め層５との付着力を高めることができる。   Moreover, the length relationship between the ready-made pile portion and the cast-in-place pile portion can be appropriately changed according to the use of the construction ground and the superstructure (see FIGS. 4A and 4B). The ready-made pile member 7 is desirably provided with a protrusion, for example, a node 12 similar to that formed in a nodal pile, at a portion located in the root-sealing layer 5. The adhesion force of can be increased.

図５は別の実施形態を示し、（ｂ）は（ａ）の水平断面図である。この実施形態は既製杭部材７を複数本配置して、これらの既製杭部材７を取り囲むように鉄筋籠８を配置した例である。既製杭部材７は、図示のような４本に限らず、適宜の本数とすることができる。   FIG. 5 shows another embodiment, and (b) is a horizontal sectional view of (a). This embodiment is an example in which a plurality of ready-made pile members 7 are arranged, and reinforcing bar 8 is arranged so as to surround these ready-made pile members 7. The number of ready-made pile members 7 is not limited to four as shown in the figure, and may be an appropriate number.

図６は、さらに別の実施形態を示している。この実施形態は、鉄筋籠８の先端部を根固め層５まで入り込ませた例である。この場合、鉄筋籠８の径を節部１２の径よりも小さくしてもよいし（同図（ａ））、節部１２の径と略等しいか又は大きくしてその外周を覆うようにしてもよい（同図（ｂ））。さらに、鉄筋籠８の下端部をラッパ状に拡げ、節部１２の外周に係止させるようにしてもよい（同図（ｃ））。   FIG. 6 shows yet another embodiment. This embodiment is an example in which the distal end portion of the reinforcing bar 8 is inserted into the root hardening layer 5. In this case, the diameter of the reinforcing bar 8 may be smaller than the diameter of the node portion 12 (FIG. 1A), or substantially equal to or larger than the diameter of the node portion 12 so as to cover the outer periphery thereof. (B). Further, the lower end portion of the reinforcing bar 8 may be expanded in a trumpet shape and locked to the outer periphery of the node portion 12 ((c) in the figure).

図７は、さらに別の実施形態を示している。この実施形態は、既製杭部分と場所打ち杭部分との一体化をさらに高めた例である。例えば、同図（ａ）に示すように、既製杭部材７の上部外周（斜線で示す部分）に凹凸を設けることにより、コンクリート層１０との付着力を高めることができる。また、同図（ｂ）に示すように、コンクリート層１０に入り込んでいる既製杭部材７の部分に節部１２のような突起を設けることにより、コンクリート層１０との付着力を高めることができる。   FIG. 7 shows yet another embodiment. This embodiment is an example in which the integration of the ready-made pile portion and the cast-in-place pile portion is further enhanced. For example, as shown to the same figure (a), the adhesive force with the concrete layer 10 can be heightened by providing an unevenness | corrugation in the upper outer periphery (part shown with an oblique line) of the ready-made pile member 7. FIG. In addition, as shown in FIG. 5B, by providing a protrusion such as a node 12 on the portion of the ready-made pile member 7 that has entered the concrete layer 10, the adhesion with the concrete layer 10 can be increased. .

この発明による杭構築方法の実施形態を示す施工手順図である。It is a construction procedure figure which shows embodiment of the pile construction method by this invention. 図１に引き続く施工手順図である。It is a construction procedure figure following FIG. 構築された杭の下端部を示す図である。It is a figure which shows the lower end part of the constructed pile. 既製杭部材の長さを変えた例を示す図である。It is a figure which shows the example which changed the length of the ready-made pile member. 別の実施形態を示す図である。It is a figure which shows another embodiment. さらに別の別の実施形態を示す図である。It is a figure which shows another another embodiment. さらに別の別の実施形態を示す図である。It is a figure which shows another another embodiment.

符号の説明Explanation of symbols

１ アースオーガ
２ 杭孔
２ａ 拡径孔
３ 拡大掘削翼
４ 支持層
５ 根固め液（根固め層）
６ 杭周固定液（杭周固定層）
７ 既製杭部材
８ 鉄筋籠
９ スライム
１０ コンクリート（コンクリート層）
１１ 杭
１２ 節部
Ａ 既製杭部分
Ｂ 場所打ち杭部分 DESCRIPTION OF SYMBOLS 1 Earth auger 2 Pile hole 2a Diameter expansion hole 3 Expansion excavation blade 4 Support layer 5 Root solidification liquid (root consolidation layer)
6 Pile circumference fixing liquid (Pile circumference fixing layer)
7 Ready-made pile members 8 Reinforcement rod 9 Slime 10 Concrete (concrete layer)
11 Pile 12 Node A A Ready-made pile part B Cast-in-place pile part

Claims (2)

杭孔を掘削する工程と、
前記杭孔の底部に根固め液を充填する工程と、
前記根固め液内に上端部が該根固め液から突出するように既製杭部材を建て込む工程と、
前記既製杭部材の少なくとも前記根固め液から突出する部分を取り囲むように、鉄筋籠を前記杭孔に建て込む工程と、
前記根固め液上の、前記既製杭部材の前記突出部分と前記鉄筋籠とが重なり合った部分にスライムが堆積するようにしてこれを除去することなく、前記杭孔内にコンクリートを打設する工程と
を備えてなる杭の構築方法。 A process of drilling a pile hole;
Filling the root of the pile hole with root-setting liquid;
Building the ready-made pile member so that the upper end protrudes from the root-setting liquid into the root-setting liquid;
Building a steel bar in the pile hole so as to surround at least a portion of the ready-made pile member that protrudes from the root-setting liquid;
A step of placing concrete in the pile hole without removing the slime so that the protruding portion of the ready-made pile member and the reinforcing bar rod overlap each other on the root hardening liquid. A method for constructing a pile comprising 前記根固め液の上方に杭周固定液を形成し、上端部が該杭周固定液から突出するように前記既製杭部材を前記根固め液及び前記杭周固定液内に建て込むことを特徴とする請求項１記載の杭の構築方法。   A pile circumference fixing liquid is formed above the root hardening liquid, and the ready-made pile member is built in the root hardening liquid and the pile circumference fixing liquid so that an upper end portion protrudes from the pile circumference fixing liquid. The pile construction method according to claim 1.
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CN106836194A (en) * 2017-01-26 2017-06-13 桐乡市天顺模具有限公司 Reinforcing self-tapping type cast-in-place pile construction method

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