JP2007039955A - Ready-made pile and foundation pile structure - Google Patents

Ready-made pile and foundation pile structure Download PDF

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JP2007039955A
JP2007039955A JP2005224758A JP2005224758A JP2007039955A JP 2007039955 A JP2007039955 A JP 2007039955A JP 2005224758 A JP2005224758 A JP 2005224758A JP 2005224758 A JP2005224758 A JP 2005224758A JP 2007039955 A JP2007039955 A JP 2007039955A
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pile
ready
steel pipe
hole
root
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Yoichi Kato
洋一 加藤
Yoshinobu Kitani
好伸 木谷
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Mitani Sekisan Co Ltd
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Mitani Sekisan Co Ltd
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<P>PROBLEM TO BE SOLVED: To easily provide a foundation pile structure with high supporting force in which balance is kept between a vertical load, an extraction force, and a horizontal force. <P>SOLUTION: This ready-made pile 1 is formed by fitting a steel tube 15 to the upper part (intermediate part, upper part) of the annular projection 10A of a concrete part 3 having annular projections 10A, 10B at its lower end part 2. The lower end 16 of the steel tube 15 is locked to the step part 5 of the concrete part 3, and the outer surface of the steel tube 15 is formed flush with the outer surface of the small straight part 6 thereof. A pile hole 21 with an enlarged foot protection part 23 is excavated at the lower part of a shaft part 22, and the ready-made pile 1 is sunk into the pile hole 2. The lower ends 16 of the annular projections 10A, 10B are positioned in the enlarged foot protection part 23 to form the foundation pile structure 30 (a). A disk-like projection 20 may be formed at the lower end part of the steel tube 15 (b)(c). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、SC杭とコンクリート杭の特徴を活かした基礎杭、およびこの基礎杭を杭穴内に埋設した基礎杭構造に関する。   The present invention relates to a foundation pile utilizing the characteristics of SC pile and concrete pile, and a foundation pile structure in which this foundation pile is embedded in a pile hole.

(1) 杭穴内に既製杭を埋設してなる基礎杭構造では、1本の杭の長さは10m程度が限界であり、一般に上杭と下杭とを接合して、既製杭を構成していた。この場合、上杭には杭頭部での水平荷重を考慮して、曲げ耐力が大きな杭、例えば、いわゆるSC杭(鋼管を巻いたコンクリート杭)、いわゆるPRC杭(PC鋼棒に並列して異形鉄筋を埋設したコンクリート杭)を使用していた。一般にこれらの杭は高価であるため、曲げ耐力をあまり必要としない下杭には、一般的なコンクリート杭を使用していた。 (1) In the foundation pile structure in which the ready-made pile is buried in the pile hole, the length of one pile is about 10m, and the upper pile and the lower pile are generally joined to form the ready-made pile. It was. In this case, considering the horizontal load at the pile head, the upper pile has a large bending strength, for example, a so-called SC pile (concrete pile wound with a steel pipe), a so-called PRC pile (in parallel with a PC steel rod). Concrete piles with deformed reinforcing bars were used. Since these piles are generally expensive, a general concrete pile is used as a lower pile that does not require much bending strength.

(2) また、最近、所定品質・形状寸法の仕様で杭穴の根固め部を築造し、杭穴内に、下端部に凸凹等を設けたコンクリート製の既製杭を埋設して、根固め部に、その凹凸部等を位置させる基礎杭構造が提案されていた。この基礎杭構造の場合、従来のコンクリート製の既製杭で凹凸等の無い円筒杭を使用した場合に比べて、約2倍の高い先端支持力を発現させることができた。 (2) In addition, recently, a pile hole rooting part was built with specifications of specified quality and shape dimensions, and a concrete ready-made pile with embossed or the like at the lower end was buried in the pile hole, The foundation pile structure which positions the uneven part etc. was proposed. In the case of this foundation pile structure, it was possible to express a tip support force about twice as high as that in the case where a conventional pile made of concrete and a cylindrical pile without irregularities was used.

一般に、複数の既製杭を上下に連結した継ぎ杭の場合、端板(接合)が同径である必要があったため、杭穴の根固め部に位置する既製杭の外径と、根固め部より上方に位置する既製杭の外径が同径となっていた。この場合、根固め部で必要とされる各種耐力・強度を基準にして既製杭の外径を設計した場合、上方に位置する既製杭の外径もこれと同径になるため、必要とされる垂直荷重に対する耐力・水平荷重に対する耐力の面から、上方に位置する既製杭で、外径が不足する問題点があった。   In general, in the case of a joint pile in which a plurality of ready-made piles are connected vertically, the end plate (joint) needs to have the same diameter, so the outer diameter of the ready-made pile located in the pile-solidified portion of the pile hole and the root-solidified portion The outer diameter of the ready-made pile located further upward was the same diameter. In this case, when the outer diameter of the ready-made pile is designed on the basis of various proof stresses and strengths required for the root consolidation part, the outer diameter of the ready-made pile located above is the same as this, which is necessary. From the standpoint of the proof strength against vertical load and proof strength against horizontal load, there was a problem that the outer diameter was insufficient with the ready-made pile located above.

(3) このような問題点を解決するために、発明者等は既に、コンクリート杭の途中で外径を変化させ、下端部が小径で、外径調節部を経て、上部が大径の既製杭を提案している(特許文献1)。この発明では、既製杭の外径調節部を根固め部内に位置させ、根固め部内では、小径の既製杭の部分が位置し、根固め部の上方には既製杭の大径の部分が位置する基礎杭構造となり、既製杭の全長に亘り鉛直耐力(圧縮強度)を満足させ、かつ鉛直支持力を確保させることができた。そして、その基礎杭構造は市場でも認められてきた。 (3) In order to solve such problems, the inventors have already changed the outer diameter in the middle of the concrete pile, the lower end is a small diameter, the outer diameter adjustment part, the upper part is a large diameter A pile is proposed (Patent Document 1). In this invention, the outer diameter adjustment part of the ready-made pile is located in the root consolidation part, the small-diameter ready-made pile part is located in the root consolidation part, and the large-diameter part of the ready-made pile is located above the root consolidation part. As a result, it was possible to satisfy the vertical strength (compressive strength) over the entire length of the ready-made piles and to secure the vertical support force. And the foundation pile structure has been recognized in the market.

また、コンクリート杭をベースとして、鋼材を用いて凸凹等を形成した基礎杭を使用して、その基礎杭を杭穴内に埋設して、鋼材を用いた凸凹等を杭穴の根固め部に位置させて、基礎杭構造を構成する発明も提案されている(特許文献2)。
特開2002−97635 特開2000−45274
Also, using a concrete pile as a base, and using a foundation pile formed with unevenness using steel, the foundation pile is embedded in the pile hole, and the unevenness using steel is positioned at the root of the pile hole. And the invention which comprises a foundation pile structure is also proposed (patent document 2).
JP 2002-97635 JP2000-45274

(1) 前記従来の技術の内、引用文献1の場合、例えば、既製杭の内、上方に使用する既製杭(上杭)にいわゆるSC杭(鋼管で被覆したコンクリート杭)を使用した場合に、SC杭部部分で高い鉛直耐力、水平耐力、引張耐力を確保できた。この場合、根固め部に位置する既製杭はコンクリート杭を使用するので、杭穴の根固め部で発揮する支持力を更に高くする場合に、根固め部に位置するコンクリート杭の外径を大きくする(杭肉厚を厚くする)ことにより、鉛直耐力を増強する必要があった。しかし、コンクリート杭の外径を大きくすることにより、鉛直支持力を増強する方法には限度があり、更なる高支持力化には対応できないことも考えられる。 (1) In the case of cited document 1 among the said prior arts, for example, when a so-called SC pile (concrete pile covered with a steel pipe) is used for a ready-made pile (upper pile) used in the upper part of the ready-made pile. It was possible to secure high vertical strength, horizontal strength, and tensile strength at the SC pile portion. In this case, since the ready-made pile located in the root consolidation part uses a concrete pile, when further increasing the supporting force exerted in the root consolidation part of the pile hole, the outer diameter of the concrete pile located in the root consolidation part is increased. It was necessary to increase the vertical proof stress by doing (thickening the pile wall thickness). However, there is a limit to the method of increasing the vertical bearing capacity by increasing the outer diameter of the concrete piles, and it may be impossible to cope with higher bearing capacity.

また、下杭をコンクリート製の既製杭とした場合には、引抜き耐力が小さいため、引き抜き耐力が高い上杭とのバランスの悪い基礎杭構造となっていた。   Moreover, when the lower pile is a ready-made pile made of concrete, since the pulling strength is small, the foundation pile structure has a poor balance with the upper pile having a high pulling strength.

従って、杭下端部を根固め部に埋設して使用する下杭の鉛直耐力および引抜き耐力の増強が必要であった。   Therefore, it was necessary to enhance the vertical and pulling strength of the lower pile used by burying the lower end of the pile in the rooting portion.

(2) また、引用文献2の場合、下杭として鋼材を使用した鋼管杭等を用いて杭材自身の鉛直耐力および引抜き耐力を増強することを実現させていた。しかし、鋼材の複雑な凸凹形状の加工を必要し、この加工の為には高い技術力を要し、簡易に製造することが難しかった。よって、高支持力に耐えるような高強度の下杭を、安定して製造・供給することができず、かつ、鋼材を多く使用するため既製杭の杭材費用が高価となり過ぎ、コスト削減が難しく、汎用性が劣る問題点もあった。 (2) Moreover, in the case of the cited reference 2, it was implement | achieving strengthening the vertical strength of a pile material itself, and a drawing strength using the steel pipe pile etc. which used steel materials as a lower pile. However, the processing of the complicated uneven shape of steel materials is required, and high technical power is required for this processing, and it was difficult to manufacture easily. Therefore, high-strength lower piles that can withstand high bearing capacity cannot be manufactured and supplied stably, and because many steel materials are used, the cost of piles for ready-made piles is too high, which reduces costs. There were also problems that were difficult and inferior in versatility.

従って、鉛直耐力、水平耐力、引抜き耐力をバランス良く満たし、かつ、経済性の良い基礎杭構造の実現が課題であった。   Therefore, the realization of a foundation pile structure that satisfies the vertical strength, horizontal strength, and pullout strength in a well-balanced manner and has good economic efficiency has been an issue.

既製杭に作用する水平力を鋼管で負担し、根固め部内には、コンクリート製の突起で対処できる構造としたので、前記問題点を解決した。   Since the horizontal force acting on the ready-made piles is borne by the steel pipe and the structure of the solidified part can be dealt with by the protrusion made of concrete, the above-mentioned problems have been solved.

即ちこの発明は、コンクリート製の杭本体の下端部が所定軸径で形成され、当該下端部に異形凹凸部が形成され、前記杭本体の少なくとも上部の全部又は一部を長さLの鋼管で被覆したことを特徴とする既製杭である。   That is, in the present invention, the lower end portion of the concrete pile main body is formed with a predetermined shaft diameter, the irregular uneven portion is formed on the lower end portion, and at least the whole or a part of the upper portion of the pile main body is a steel pipe having a length L. It is a ready-made pile characterized by covering.

また、前記において、杭本体で、鋼管を被覆していない部分の外径と、鋼管を被覆した部分の外径とを異なる径で形成したことを特徴とする既製杭である。また、前記において、根固め部を有する杭穴内に埋設して使用する既製杭であって、前記既成杭の下端部が前記杭穴の根固め部に位置するように構成した既製杭である。また、深さ方向に1つ以上の強度増強部を有する杭穴内に埋設して使用する既製杭であって、鋼管の下端が、前記杭穴の強度増強部内に位置するように、前記鋼管を構成した既製杭である。   Moreover, in the above, it is a ready-made pile characterized by forming the outer diameter of the part which is not covering the steel pipe in the pile main body, and the outer diameter of the part covering the steel pipe with different diameters. Moreover, in the above, it is the ready-made pile which is embedded and used in the pile hole which has a root consolidation part, Comprising: It is the ready-made pile comprised so that the lower end part of the said existing pile may be located in the root consolidation part of the said pile hole. Moreover, it is a ready-made pile which is embedded and used in a pile hole having one or more strength enhancing portions in the depth direction, and the steel pipe is placed so that the lower end of the steel pipe is located in the strength enhancing portion of the pile hole. It is a prefabricated pile.

また、他の発明は、所定軸径を有する複数の単位杭を上下に接合してなる既製杭であって、少なくとも1本の単位杭は、外周の全部又は一部を鋼管で被覆して構成し、少なくとも1本の単位杭は、外周の全部又は一部に異形凹凸部を形成して構成したことを特徴とする既製杭である。また、前記において、上下に位置する単位杭の軸径を異なる径で形成したことを特徴とする既製杭である。   Another invention is a ready-made pile formed by vertically joining a plurality of unit piles having a predetermined shaft diameter, and at least one unit pile is configured by covering all or part of the outer periphery with a steel pipe. And at least 1 unit pile is a ready-made pile characterized by forming the irregular uneven | corrugated | grooved part in all or one part of outer periphery. Moreover, in the said, it is the ready-made pile characterized by forming the shaft diameter of the unit pile located up and down with a different diameter.

また、根固め部を有する杭穴内に既製杭を埋設して構成する基礎杭構造において、前記既製杭は、所定軸径を有する複数の単位杭を上下に接合して構成し、前記単位杭の内、少なくとも1本の単位杭は、全部又は一部の外周を鋼管で被覆して構成し、少なくとも1本の単位杭は、異形凹凸部を形成して構成したことを特徴とする基礎杭構造である。   Moreover, in the foundation pile structure which embeds and constructs a ready-made pile in the pile hole which has a root-solidification part, the said ready-made pile comprises a plurality of unit piles which have a predetermined axis diameter, and constitutes, Among them, at least one unit pile is constructed by covering all or part of the outer periphery with a steel pipe, and at least one unit pile is constructed by forming irregular irregularities, It is.

また、前記において、少なくとも1つの異形凹凸部を杭穴の根固め部内に位置させることを特徴とする基礎杭構造である。また、前記において、杭穴と既製杭との間に杭周固定液層を形成し、該杭周固定液層の所定の深さに強度増強部を形成し、1つ又は複数の鋼管の上端又は下端位置、単位杭の接合位置、異形凹凸部位置の各位置の一部又は全部を前記強度増強部に埋設したことを特徴とする基礎杭構造である。   Further, in the above, the foundation pile structure is characterized in that at least one irregularly shaped uneven portion is positioned in a rooted portion of the pile hole. Further, in the above, a pile circumference fixing liquid layer is formed between the pile hole and the ready-made pile, a strength increasing portion is formed at a predetermined depth of the pile circumference fixing liquid layer, and upper ends of one or a plurality of steel pipes Or it is the foundation pile structure characterized by having embed | buried a part or all of each position of a lower end position, the joint position of a unit pile, and a deformed uneven | corrugated | grooved part position in the said strength enhancement part.

更に、根固め部を有する杭穴内に既製杭を埋設して構成する基礎杭構造において、杭穴と既製杭との間に杭周固定液層を形成し、該杭周固定液層の所定の深さに強度増強部を形成し、前記既製杭は、コンクリート製の杭本体の少なくとも上部を長さLの鋼管で被覆すると共に、前記コンクリート製の杭本体で、前記鋼管の上端又は下端に近接して異形凹凸部を形成して、前記異形凹凸部及び前記鋼管の上端又は下端を、前記根固め部内又は強度増強部内に、埋設したことを特徴とした基礎杭構造である。   Furthermore, in the foundation pile structure which embeds and constructs a ready-made pile in a pile hole which has a root consolidation part, a pile circumference fixed liquid layer is formed between a pile hole and a ready-made pile, and the predetermined circumference of this pile circumference fixed liquid layer is formed. A strength increasing portion is formed at a depth, and the ready-made pile covers at least an upper part of a concrete pile main body with a steel pipe having a length L and is close to the upper end or the lower end of the steel pipe with the concrete pile main body. Then, the irregular pile portion is formed, and the irregular pile portion and the upper end or the lower end of the steel pipe are embedded in the root hardening portion or the strength enhancing portion.

前記における「異形凹凸部」とは、周囲の表面形状とは異なる凹部又は凸部、あるいは凹部と凸部の組合せを指す。更に、径を変化させた段差も含む。要は、鉛直支持力を増強するために下方に向けた面を形成し、また、引抜力を増強させるために上方に向けた面が形成されていれば良い。   The “irregular irregularities” in the above refers to concave portions or convex portions or a combination of concave portions and convex portions different from the surrounding surface shape. Furthermore, a step having a changed diameter is also included. In short, it is only necessary to form a downward surface in order to increase the vertical support force and to form an upward surface in order to increase the pulling force.

また、前記における「強度増強部」は、主に先端支持力を発揮する支持地盤に対応した深さで杭穴に形成される根固め部である。根固め部では、杭穴軸部に比して富配合のセメントミルクを充填し固化させて根固め層を形成する。この場合、根固め部は杭穴軸部より拡大掘削して拡大根固め部とすることが望ましいが、杭穴軸部と同径とすることもできる。   The “strength enhancing portion” in the above is a solidified portion formed in the pile hole at a depth corresponding to the support ground that mainly exhibits the tip support force. In the root consolidation part, the cemented milk of a rich blend is filled and solidified as compared with the pile hole shaft part to form a root consolidation layer. In this case, it is desirable that the root consolidation portion is expanded and excavated from the pile hole shaft portion to form an enlarged root consolidation portion, but it may be the same diameter as the pile hole shaft portion.

また、「強度増強部」は先端支持力を発揮させる地盤に至る深さより浅い位置に中間支持層がある地盤では、中間支持層に対応させて、杭穴内に杭穴軸部に比して富配合のセメントミルクを充填し固化させて、「強度増強部」とすることもできる。この場合、富配合のセメントミルクを充填し固化させて、さらに、その深さでの杭穴径を周囲より大径に形成することもできる。また、セメントミルクは富配合とすることが望ましいがその深さでの杭穴径を周囲より大径に形成すれば、セメントミルクの配合は周囲の杭周固定液と同等とすることもできる。   In addition, the “strengthening part” is abundant in the pile hole compared to the shaft part of the pile hole, corresponding to the intermediate support layer, in the ground where the intermediate support layer is shallower than the depth to the ground where the tip support force is exhibited. The blended cement milk can be filled and solidified to form a “strength enhancing portion”. In this case, it is possible to fill and solidify the rich blended cement milk, and further to make the pile hole diameter at that depth larger than the surrounding diameter. Further, it is desirable that the cement milk is rich, but if the pile hole diameter at the depth is made larger than the surrounding diameter, the cement milk can be mixed with the surrounding pile fixing liquid.

杭本体の下端部に異形凹凸部を形成し、根固め部内に異形凹凸部を位置させれば、根固め部内に杭穴底に向けた下面又は地上に向けた上面を形成できるので、固化した根固め液層の機能を充分に発揮させて、既製杭に作用する垂直荷重又は引抜き力を有効に負担できる。更に、既製杭の上部を鋼管で覆ったので、既製杭に大きな水平力が作用した場合にでも上部を鋼管で覆った既製杭部で充分に対応できる。   If the irregularities are formed at the lower end of the pile body and the irregularities are located in the rooting part, the bottom surface in the rooting part or the top surface toward the ground can be formed, so it has solidified The function of the root hardening liquid layer can be fully exhibited, and the vertical load or pulling force acting on the ready-made pile can be effectively borne. Furthermore, since the upper part of the ready-made pile is covered with the steel pipe, even when a large horizontal force is applied to the ready-made pile, the ready-made pile part whose upper part is covered with the steel pipe can be sufficiently handled.

従って、バランスの良い高支持力の基礎杭構造を実現でき、少ない本数又は小さな口径で、従来同様の杭基礎の耐力を達成できる。   Therefore, a well-balanced foundation pile structure with a good balance can be realized, and the conventional pile foundation with the small number or small diameter can be achieved.

また、コンクリート製の異形凹凸部であるので、根固め部内では根固め液との相性が良く、固化した根固め液層内にコンクリート製の異形凹凸部から効率よく力を伝搬することができる。   Moreover, since it is a deformed uneven part made of concrete, it has good compatibility with the root-setting liquid in the root-solidified part, and power can be efficiently transmitted from the irregular-shaped uneven part made of concrete into the solidified root-setting liquid layer.

また、鋼管の下端部に突起を形成した場合には、引抜き力に対して、既製杭上部の鋼管部のみで負担することができ、既製杭下部のコンクリート部では引抜き力の影響が小さくなるため、コンクリート部については簡易な形態とする事が可能となる。更に、既製杭自体の引抜耐力を増強できるため、支持力、水平力、引抜き力など、バランスの取れた高耐力基礎杭構造が可能となる。   In addition, when a protrusion is formed at the lower end of the steel pipe, the pulling force can be borne only by the steel pipe part at the upper part of the pre-made pile, and the influence of the pulling force is reduced at the concrete part at the lower part of the pre-made pile. The concrete part can be made into a simple form. Further, since the pulling strength of the ready-made pile itself can be increased, a balanced high strength foundation pile structure such as a supporting force, a horizontal force, and a pulling force becomes possible.

また、鋼管の下端部に突起を形成し、鋼管の下端部を杭穴の根固め部内に位置させた場合には、既製杭下端部のコンクリート部が完全に根固め部内に埋設され、コンクリート部は固化した根固め液に補強されることとなり、コンクリート部の強度は大幅に向上する。したがって、上部の鋼管部の性能を充分に発揮できる既製杭構造により、バランスの取れた高耐力基礎杭構造が実現できる。   In addition, when a protrusion is formed on the lower end of the steel pipe and the lower end of the steel pipe is positioned in the root consolidation part of the pile hole, the concrete part at the lower end of the pre-made pile is completely embedded in the root consolidation part, and the concrete part Will be reinforced by the solidified root hardening liquid, and the strength of the concrete will be greatly improved. Therefore, a well-balanced high strength foundation pile structure can be realized by the ready-made pile structure that can sufficiently exhibit the performance of the upper steel pipe portion.

(1) この発明の既製杭は、コンクリート製の杭本体の下端部を外径Dで形成し、下端部以外(上部、中間部)の外径Dで形成する(D≦D)。外径Dの部分に環状突起(異形凹凸部)を形成する。環状突起は、外径Dとの段差部(径が変化している部分)に隣接して構成する。杭本体の外径Dの部分は、長さLだけ存在し、その部分に長さLで外径Dの鋼管を被覆して、この発明の既製杭を構成する。前記の外径Dの部分の位置、すなわち鋼管を被覆した部分は、通常は水平耐力の強化が求められるので、杭本体の下端部以外に配置されるが、杭本体の下端部に配置することもできる。 (1) ready-made pile of the present invention forms a lower portion of the concrete pile body with an outer diameter D 0, formed by an outer diameter D 1 of the non-lower end (upper, middle section) (D 1 ≦ D 0 ). The portion of the outer diameter D 0 to form an annular projection (irregular uneven portion). Annular projection is constructed adjacent to the stepped portion of the outer diameter D 0 (the portion size is changed). Outer diameter D 1 of the portion of the pile body, there by a length L 5, and covers the steel pipe having an outer diameter D in length L 5 in that portion, constituting a prefabricated pile of the present invention. Position of the outer diameter D 1 of the portion of the, i.e. the portion covered steel pipes, since generally sought to strengthen the lateral strength, but that are placed outside the lower end of the pile body, arranged at the lower end portion of the pile body You can also

(2) (1)において、杭本体の外径Dで、鋼管を被覆した部分の外径Dで、D<Dとして、鋼管の外径D=Dとすれば、鋼管の外径と杭本体の下端部の外径を同一として、表面に段差をなくすことができる。この場合には、杭の長さ方向で、異形凹凸部を除いて同径に形成されるので、埋設時の抵抗が少なく、埋設後の径変化部分で、応力の集中が生じるおそれが少ない。 (2) (1), an outer diameter D 0 of the pile body, an outer diameter D 1 of the portion coated with steel, as D 1 <D 0, if the outer diameter D = D 0 of the steel pipe, the steel pipe The outer diameter and the outer diameter of the lower end of the pile main body can be made the same, and a step can be eliminated on the surface. In this case, since the same diameter is formed in the length direction of the pile except for the irregular concavo-convex portion, there is little resistance at the time of embedding, and there is little possibility of stress concentration at the diameter changing portion after embedding.

しかし、D≠D として杭本体(コンクリート部分)の下端部外周と鋼管の外周とに段差を形成することもできる。また、杭本体(コンクリート部分)を、D=Dとして、杭本体の径を上下で同径として、杭本体に段差を形成せずに、杭本体の下端部外周と鋼管の外周とに段差を形成とすることもできる。 However, it is also possible to form a step on the outer circumference of the lower end outer periphery and the steel pipe pile body (concrete portions) as D ≠ D 0. Moreover, the pile main body (concrete part) is set to D 1 = D 0 , the diameter of the pile main body is the same diameter in the upper and lower sides, and without forming a step in the pile main body, the outer periphery of the lower end of the pile main body and the outer periphery of the steel pipe A step can also be formed.

(3) 既製杭の下端部、即ち、異形凹凸部は、根固め部内に位置させるように、設置することが望ましい。根固め部内は富配合のセメントミルクを充填して固化する根固め層が形成される。根固め層内に異形凹凸部が位置することにより、既製杭に作用した鉛直荷重が効率よく根固め層に伝わり、より大きな支持力を発揮できる。即ち、既製杭に鉛直荷重が作用した場合、異形凹凸部の下方に向けた面から、斜め下方に向けて荷重が分散的に根固め層の底面に伝わるからである。 (3) It is desirable to install the lower end portion of the ready-made pile, that is, the irregular concavo-convex portion so as to be positioned in the root-solidified portion. A root hardening layer is formed in the root hardening part to be solidified by filling cement milk with a rich blend. By positioning the irregularities in the root consolidation layer, the vertical load acting on the ready-made pile can be efficiently transmitted to the root consolidation layer, and a greater bearing force can be exhibited. In other words, when a vertical load is applied to the ready-made pile, the load is distributed to the bottom surface of the rooting layer in a distributed manner from the surface facing the lower side of the irregular concavo-convex portion to the lower side.

従って、異形凹凸部は拡大根固め部内に位置させることが好ましいが、中間に支持層が位置する地盤では、杭穴の中間支持層付近の深さに強度増強部(根固め部と同等又は若干強度落ちる配合のセメントミルクを充填する。径は杭穴軸部同じ又は拡大する)を形成して、その中間支持層内に異形凹凸部を位置させることもできる。   Therefore, it is preferable that the irregular irregularities are located in the enlarged root consolidation part. However, in the ground where the support layer is located in the middle, the strength enhancement part (equivalent to or slightly equal to the root consolidation part) is formed at a depth near the intermediate support layer of the pile hole. It is also possible to form cemented milk of a composition that falls in strength, the diameter of which is the same as or larger than that of the pile hole shaft, and to place the irregular irregularities in the intermediate support layer.

また、異形凹凸部に形成される上方に向けた面が、同様に引抜力に作用する。   Further, the upward-facing surface formed on the irregular concavo-convex portion similarly acts on the pulling force.

(4) 異形凹凸部として、環状突起を形成したが、断続的な突起とすることもでき、また下端部軸部に凹部又は溝を形成することもできる。要は、下端部軸部の表面より突出し、あるいは凹んだ構造の下端部軸部と径が異なる部分が形成され、これにより下方に向けた面(鉛直荷重支持用)、上方に向けた面(引抜力支持用)が形成されていれば良い。 (4) Although the annular projection is formed as the irregular irregular portion, it can be an intermittent projection, and a recess or groove can be formed in the lower end shaft portion. In short, a portion having a diameter different from that of the lower end shaft portion of the lower end portion shaft portion that protrudes or is recessed is formed, whereby a surface directed downward (for vertical load support), a surface directed upward ( It is only necessary that a pulling force support) is formed.

(5) 鋼管の長さLは、鋼管の下端が杭穴の根固め部内に位置させるように、設定することが望ましい。根固め部内は富配合のセメントミルクを充填して固化して根固め層を形成する。鋼管の下端は応力が集中しやすい傾向があるので、根固め層内に位置することにより、応力集中(とりわけ曲げ応力)の影響を受けることなく、既製杭から根固め層に鉛直荷重を確実に伝達できる。 (5) the length L 5 of the steel tube, the lower end of the steel pipe so as to position the root compaction portion of Kuiana, it is desirable to set. The root-solidified portion is filled with a rich blend of cement milk and solidified to form a root-solidified layer. Since the stress tends to concentrate at the lower end of the steel pipe, it is ensured that the vertical load is applied from the ready-made pile to the consolidation layer without being affected by stress concentration (especially bending stress) by being located in the consolidation layer. Can communicate.

また、中間に支持層が位置する地盤で、杭穴の中間支持層付近の深さに強度増強部を形成した場合、鋼管の下端を強度増強部内に位置させることもできる。   Moreover, when the strength increasing portion is formed at a depth near the intermediate supporting layer of the pile hole in the ground where the supporting layer is located in the middle, the lower end of the steel pipe can be positioned in the strength increasing portion.

(6) 既製杭は、1本の既製杭から上記(1)の発明を構成するが、あるいは複数の単位既製杭を上下に連結して形成することもできる。この場合、上下に位置する単位杭の軸径を異なる径で形成することもでき、環状突起の有無、鋼管の被覆の有無など選択して、各深さで求められる既製杭の機能に応じて選択して、バランスの良い基礎杭構造を構成できる。 (6) Although a ready-made pile comprises the invention of said (1) from one ready-made pile, a several unit ready-made pile can also be connected up and down and formed. In this case, the shaft diameter of the unit piles positioned above and below can be formed with different diameters, depending on the function of the ready-made piles required at each depth by selecting the presence or absence of annular protrusions, presence or absence of coating of steel pipes, etc. Select and configure a well-balanced foundation pile structure.

要は、複数の単杭を上下に連結して既製杭を構成する場合には、地盤に応じて、杭穴内で、1箇所又は複数個所に強度増強部を形成するので、この強度増強部に対応させて、鋼管を取り付けし、あるいは異形凹凸部を形成すればよい。強度増強部に配置によっては、総ての単杭に鋼管を形成し、あるいは異形凹凸部を形成する場合もある。   In short, when constructing ready-made piles by connecting multiple single piles up and down, depending on the ground, a strength enhancing part is formed in one or more places in the pile hole, so this strength enhancing part Correspondingly, a steel pipe may be attached, or a deformed uneven portion may be formed. Depending on the arrangement of the strength-enhancing part, steel pipes may be formed on all single piles, or irregular irregularities may be formed.

(7) (1)で、前記鋼管は、主に曲げ応力及びせん断応力に対して作用するので、少なくとも上端部を被覆してあればよく、中間部、下端部は、必要に応じて断続的に複数枚の鋼管で被覆することもできる。 (7) In (1), since the steel pipe mainly acts on bending stress and shear stress, it is sufficient to cover at least the upper end portion, and the intermediate portion and the lower end portion are intermittent as required. It is also possible to coat with a plurality of steel pipes.

(8) (1)のように、下端部軸径Dと鋼管の外径をDとして同一としたが(図3(b))、
被覆した鋼管の外径<杭本体の下端部の軸径
のように、異なる径で形成することもできる。杭本体の下端部には鋼管で被覆されないので、一般に鋼管より大径に形成することがバランス上望ましいが、逆に、
杭本体の下端部の軸径<被覆した鋼管の外径
とすることもできる。
(8) as in (1), although the outer diameter of the lower end shaft diameter D 0 and the steel pipe was the same as D 0 (FIG. 3 (b)),
It can be formed with different diameters, such as the outer diameter of the coated steel pipe <the shaft diameter of the lower end of the pile body. Since the lower end of the pile body is not covered with a steel pipe, it is generally desirable to have a larger diameter than the steel pipe, but on the contrary,
The shaft diameter of the lower end of the pile body may be smaller than the outer diameter of the coated steel pipe.

(9) 前記のようにして構成した既製杭を予め掘削した杭穴内に(又は杭穴を掘削しながら杭穴内)に埋設して、基礎杭構造を構成する。杭穴の先端部に根固め部(強度増強部)を形成する場合には、既製杭の環状突起(異形凹凸部)及び鋼管の下端は、杭穴の根固め部内に位置させる。 (9) The foundation pile structure is constructed by burying the ready-made pile constructed as described above in a pile hole excavated in advance (or in the pile hole while excavating the pile hole). In the case where a root consolidation part (strength enhancement part) is formed at the tip of the pile hole, the annular projections (deformed irregularities) of the ready-made pile and the lower end of the steel pipe are positioned in the root consolidation part of the pile hole.

また、杭穴の軸部(上部又は中間部)には杭周固定液(一般に根固め液より貧配合のセメントミルク)が充填されるが、例えば、中間深さに比較的堅い中間支持層がある地盤では、その中間支持層に対応させて、セメントミルクを根固め層と同程度又若干落ちる配合として、強度増強部とすることもできる。   Moreover, the shaft part (upper part or intermediate part) of the pile hole is filled with a pile fixing liquid (generally cement milk that is poorer than the root hardening liquid). In a certain ground, it is possible to make the strength enhancing part as a composition corresponding to the intermediate support layer, in which the cement milk is dropped to the same degree or slightly as the root hardening layer.

また、複数の異形凹凸部を形成した場合には、全部が根固め部又は他の強度増強部に位置させることが望ましいが、少なくとも1つの異形凹凸部を位置させれば目的は達成される。   In addition, when a plurality of irregularly shaped irregularities are formed, it is desirable that all of them be located in the rooting part or other strength enhancing part, but the object can be achieved if at least one irregularly irregular part is located.

また、鋼管の上端又は下端、即ち既製杭の表面で鋼管とコンクリートの継ぎ目部分も、一般に応力が集中するおそれがあるので、根固め部又は他の強度増強部に位置させることが望ましい。   Further, the upper end or the lower end of the steel pipe, that is, the joint portion of the steel pipe and the concrete on the surface of the ready-made pile is generally likely to be stress concentrated, so it is desirable that the steel pipe and the concrete joint be positioned at the root hardening part or other strength enhancing part.

図面に基づきこの発明の実施例を説明する。   Embodiments of the present invention will be described with reference to the drawings.

[1]既製杭1の構成 [1] Configuration of ready-made pile 1

(1) 環状突起10、10を形成する凹部を有する型枠(図示していない)内に、長さL、外径Dの鋼管11を設置して、必要なPC鋼棒、鉄筋を配置して、コンクリートを打設して、遠心成形して、この発明の既製杭1を構成する(図1(a))。 (1) A steel pipe 11 having a length L 5 and an outer diameter D 0 is installed in a mold (not shown) having a recess for forming the annular protrusions 10 and 10, and necessary PC steel bars and reinforcing bars are attached. It arrange | positions, casts concrete, and centrifugally forms, and the ready-made pile 1 of this invention is comprised (FIG. 1 (a)).

(2) この既製杭1は、下端部2に環状突起(異形凹凸部)10A、10Bを有するコンクリート部3の環状突起(上側)10Aの上方(中間部、上部)に鋼管15を嵌装した構造となっている。コンクリート部3は、鋼管15を取り付けたストレート部4、鋼管15の下端16が係止した段差部5、段差部5と環状突起10Aの間の小ストレート部6、環状突起10A、10Bの間の小ストレート部7、環状突起10Bの下方の小ストレート部8から構成される。 (2) This ready-made pile 1 has a steel pipe 15 fitted above (intermediate part, upper part) above the annular protrusion (upper side) 10A of the concrete part 3 having the annular protrusions (deformed irregularities) 10A, 10B at the lower end part 2. It has a structure. The concrete part 3 includes a straight part 4 to which the steel pipe 15 is attached, a step part 5 to which the lower end 16 of the steel pipe 15 is locked, a small straight part 6 between the step part 5 and the annular protrusion 10A, and between the annular protrusions 10A and 10B. The small straight portion 7 is composed of a small straight portion 8 below the annular protrusion 10B.

鋼管15の下端16は、コンクリート部3の段差部5に係止し、鋼管15の外表面と小ストレート部6の外表面とは面一に形成されている。   The lower end 16 of the steel pipe 15 is engaged with the step part 5 of the concrete part 3, and the outer surface of the steel pipe 15 and the outer surface of the small straight part 6 are formed flush with each other.

(3) 環状突起10は、環状突起10A、10Bの2つが、下端2aからH、Hの位置に、放射方向の長さ(出の長さ)Lで、形成されている。また、環状突起は、上下がテーパー状に形成され、傾斜上面11、傾斜下面12を夫々形成してある。 (3) annular projection 10 has an annular projection 10A, two of 10B, the position of H 1, H 2 from the lower end 2a, the length of the radial (length of exit) at L 1, it is formed. Further, the annular protrusion is formed in a tapered shape at the top and bottom, and has an inclined upper surface 11 and an inclined lower surface 12, respectively.

(4) 尚、図中18、19は、夫々上下の端板である。 (4) In the figure, reference numerals 18 and 19 denote upper and lower end plates, respectively.

(5) また、例えば、
鋼管の外径D = 60cm
環状突起の外径「D+2×L」= 75cm
環状突起10Aの高さH= 150cm
貴環状突起10Bの高さH= 50cm
環状突起の間隔「H−H」= 100cm
で形成されている。
(5) Also, for example,
Steel pipe outer diameter D 0 = 60 cm
The outer diameter of the annular protrusion “D 0 + 2 × L 1 ” = 75 cm
The height H 2 of the annular protrusion 10A = 150 cm
Height H 1 = 50 cm of noble annular protrusion 10B
Distance between annular protrusions “H 2 −H 1 ” = 100 cm
It is formed with.

[2]基礎杭構造30の構成 [2] Configuration of foundation pile structure 30

(1) 軸部22の下方に拡大根固め部23形成した所定の杭穴21を掘削する(図1(a))。 (1) Excavate a predetermined pile hole 21 formed with the enlarged rooting portion 23 below the shaft portion 22 (FIG. 1A).

(2) 杭穴21内に、既製杭1を沈設し、拡大根固め部23内に、2つの環状突起10A、10B、鋼管15の下端16(コンクリート部2の段差部5)が位置するように設置する。この際、杭穴21の拡大根固め部23内には根固め液が、杭穴21の軸部22には、杭周固定液が夫々充填されている。根固め液及び杭周固定液が固化発現したならば、この発明の基礎杭構造30を構成する。基礎杭構造30は、既製杭1の環状突起10A、10B及び鋼管15の下端部(段差部5周辺)が根固め液が固化した根固め層25内に、既製杭1の鋼管15が杭周固定液が固化した杭周固定液層26内に埋設される。 (2) The ready-made pile 1 is set in the pile hole 21, and the two annular protrusions 10 </ b> A and 10 </ b> B and the lower end 16 of the steel pipe 15 (the stepped portion 5 of the concrete portion 2) are located in the enlarged rooting portion 23. Install in. At this time, the root consolidation liquid 23 is filled in the enlarged root consolidation part 23 of the pile hole 21, and the shaft periphery 22 of the pile hole 21 is filled with the pile circumference fixing liquid. If the root hardening liquid and the pile periphery fixing liquid are solidified, the foundation pile structure 30 of the present invention is configured. The foundation pile structure 30 includes the annular projections 10A and 10B of the ready-made pile 1 and the bottom end of the steel pipe 15 (in the vicinity of the stepped portion 5) in the rooting layer 25 where the rooting liquid is solidified, and the steel pipe 15 of the ready-made pile 1 is The fixed liquid is embedded in the pile peripheral fixed liquid layer 26 that has solidified.

(3) 根固め液層26の根固め液は、掘削泥土と置換したコンクリート、モルタル、セメントミルク、あるいは掘削泥土とセメントミルク等とを撹拌混合して、構成する。 (3) The root-setting liquid of the root-setting liquid layer 26 is formed by stirring and mixing concrete, mortar, cement milk, or drilling mud and cement milk that has been replaced with the drilling mud.

また、根固め液層26は、固化した後、既製杭1に垂直荷重が作用した際に、環状突起10A、10Bの傾斜下面12、12及び/又は既製杭1の底2aからせん断力が伝搬して、根固め液層26が破壊されるまで(せん断力の伝搬方向に沿って亀裂が生じるまで)、より多くの荷重を負担できる。根固め液層26を構成する根固め液はこのような作用を可能とする程度の固化強度となるように、調整されている。通常、根固め液層26の根固め液の固化強度は、支持地盤の地盤強度と略同一としてある。   In addition, after the solidified liquid layer 26 is solidified, when a vertical load is applied to the ready-made pile 1, shear force propagates from the inclined lower surfaces 12 and 12 of the annular protrusions 10 </ b> A and 10 </ b> B and / or the bottom 2 a of the ready-made pile 1. Thus, a larger load can be borne until the root-solidifying liquid layer 26 is broken (until a crack is generated along the propagation direction of the shearing force). The root hardening liquid which comprises the root hardening liquid layer 26 is adjusted so that it may become the solidification intensity | strength of the grade which enables such an effect | action. Usually, the solidification strength of the root hardening liquid of the root hardening liquid layer 26 is substantially the same as the ground strength of the supporting ground.

(4) また、基礎杭構造30の基礎杭1に引抜力が作用した場合、垂直荷重と同様に、根固め液層26内の環状突起10A、10Bの傾斜上面11、11から斜め上方に向けてせん断力が伝搬して、根固め液層26が破壊されるまで、より多くの引抜力を負担できる。 (4) Further, when a pulling force is applied to the foundation pile 1 of the foundation pile structure 30, the inclined projections 11 </ b> A and 10 </ b> B in the root hardening liquid layer 26 are inclined upward from the inclined upper surfaces 11 and 11 in the same manner as the vertical load. Thus, more pulling force can be borne until the shearing force propagates and the root hardening liquid layer 26 is destroyed.

(5) また、地震時等で、基礎杭構造30の既製杭1の杭頭部に水平荷重が作用した場合、既製杭1はコンクリート部3の外周が鋼管15で被覆されているので、これを充分に負担できる。また、この際、鋼管15を被覆していない部分、即ち鋼管15の下端16より下方は、根固め液層26内に位置し、固化根固め液に覆われているので、水平荷重の影響を受けることが少なく、基礎杭構造30の全体として、充分な耐水平力を有する。 (5) Moreover, when a horizontal load acts on the pile head of the ready-made pile 1 of the foundation pile structure 30 at the time of an earthquake etc., since the outer periphery of the concrete part 3 is covered with the steel pipe 15 in the ready-made pile 1, this Can be fully paid. At this time, the portion not covering the steel pipe 15, that is, the portion below the lower end 16 of the steel pipe 15, is located in the root hardening liquid layer 26 and is covered with the solidified root hardening liquid. The foundation pile structure 30 has a sufficient horizontal resistance as a whole.

[3]他の実施例 [3] Other embodiments

(1) 前記実施例において、環状突起を2つ形成したが、少なくとも1つ形成してあれば、可能である。また、環状突起を2つ以上形成した場合、根固め液層内でせん断力を有効に伝搬させる必要から、環状突起の間隔(H−H)は、各環状突起10、10の下面12、12から斜め下方、または環状突起10、10の上面11から斜め上方へのせん断力の伝搬が重ならないような長さで形成する。 (1) In the above embodiment, two annular protrusions are formed, but it is possible if at least one is formed. Further, when two or more annular protrusions are formed, it is necessary to effectively propagate the shearing force in the root hardening liquid layer. Therefore, the interval between the annular protrusions (H 2 −H 1 ) is the lower surface 12 of each annular protrusion 10, 10. , 12 and a length that prevents the propagation of shear forces from the upper surface 11 of the annular protrusions 10 and 10 obliquely upward.

(2) 前記実施例において、鋼管15の下端部に円盤状突起20、20を形成して基礎杭構造30とすることもできる(図2(b)(c))。円盤状突起20は、鋼管15の下端16に溶接し(図2(b))、あるいは下端16から距離Lを空けて上方に溶接することもできる(図2(c))。 (2) In the said Example, the disk-shaped protrusions 20 and 20 can be formed in the lower end part of the steel pipe 15, and it can also be set as the foundation pile structure 30 (FIG.2 (b) (c)). Disk-shaped protrusion 20 is welded to the lower end 16 of the steel pipe 15 (FIG. 2 (b)), or may be welded upward at a distance L 2 from the lower end 16 (FIG. 2 (c)).

また、この場合、既製杭1を遠心成形する際に、予め鋼管15にドーナッツ状の鋼板(またはドーナツ状の鋼板を半割りした2つ)を溶接しておくこともでき、あるいは遠心成型後に、鋼管15の所定位置にドーナッツ状の鋼板を溶接を溶接して形成することができる。   In this case, when the ready-made pile 1 is subjected to centrifugal molding, a donut-shaped steel plate (or two donut-shaped steel plates in half) can be welded to the steel pipe 15 in advance, or after centrifugal molding, A donut-shaped steel plate can be formed at a predetermined position of the steel pipe 15 by welding.

また、いずれの場合でも円盤状突起20は、杭穴21の根固め液層26内に位置するように、既製杭1を埋設して基礎杭構造30を構成し、環状突起10A、10Bと同じ機能を発揮する(図1(b)(c))。   In any case, the disk-like protrusion 20 is embedded in the ready-made pile 1 so as to be located in the root hardening liquid layer 26 of the pile hole 21 to constitute the foundation pile structure 30 and is the same as the annular protrusions 10A and 10B. The function is exhibited (FIGS. 1B and 1C).

(3) また、前記実施例において、コンクリート部3に段差部5を形成して、鋼管15面と小ストレート部6の表面とを面一に形成したが、段差部5を省略して、ストレート部4と小ストレート部6とを連続的に形成することもできる(図示していない)。 (3) Moreover, in the said Example, although the level | step-difference part 5 was formed in the concrete part 3 and the steel pipe 15 surface and the surface of the small straight part 6 were formed in the same plane, the level | step-difference part 5 was abbreviate | omitted and straightened. The part 4 and the small straight part 6 can also be formed continuously (not shown).

(4) また、前記実施例において、既製杭1は単独で使用したが、既製杭1を下杭として、通常のSC杭を上杭として連結して、杭穴21内に埋設して、基礎杭構造30とすることもできる(図示していない)。 (4) Moreover, in the said Example, although the ready-made pile 1 was used independently, it connects with the normal SC pile as an upper pile, using the ready-made pile 1 as a lower pile, and embed | buried in the pile hole 21, and a foundation It can also be set as the pile structure 30 (not shown).

前記実施例1では、既製杭1を単杭としたが、この実施例では、上下杭を連結して既製杭1を構成する。   In the said Example 1, although the ready-made pile 1 was made into the single pile, in this Example, an up-and-down pile is connected and the ready-made pile 1 is comprised.

[1]既製杭1の構成 [1] Configuration of ready-made pile 1

(1) この実施例の既製杭1は、上杭32と下杭33とを連結継手34で接合して構成する(図3(b))。 (1) The ready-made pile 1 of this embodiment is configured by joining an upper pile 32 and a lower pile 33 with a connecting joint 34 (FIG. 3B).

(2) 上杭32は、コンクリート基体3(外径D)の周囲を鋼管15(長さL、外径D、内径D)で被覆し、上下に鋼製の端板18、41を設置して構成したいわゆるSC杭である。下端板41の外周に接合用の嵌合溝43が形成されている。上杭32は長さL、外径Dで形成されている。 (2) The upper pile 32 covers the periphery of the concrete base 3 (outer diameter D 1 ) with a steel pipe 15 (length L 5 , outer diameter D 0 , inner diameter D 1 ), and steel end plates 18 on the upper and lower sides. This is a so-called SC pile constructed by installing 41. A fitting groove 43 for joining is formed on the outer periphery of the lower end plate 41. The upper pile 32 is formed with a length L 4 and an outer diameter D 0 .

(3) 下杭33は、長さLのコンクリート杭で、外周に2つの環状突起10A、10Bを形成してあり、上下に上端板42、下端板19を取り付けてある。環状突起10A、10Bは、前記実施例1と同様で、下端33aからH、Hの位置で、放射方向の長さ(出)Lで、2つ形成されている。また、上端板42の外周に嵌合溝43を形成してある。 (3) lower pile 33, concrete pile length L 3, 2 one annular protrusion 10A on the outer periphery, Yes to form 10B, the upper end plate 42 up and down, is attached to the lower end plate 19. Similar to the first embodiment, two annular protrusions 10A and 10B are formed at radial positions (out) L 1 at positions H 1 and H 2 from the lower end 33a. A fitting groove 43 is formed on the outer periphery of the upper end plate 42.

また、上杭33は、上端板42と環状突起10Aの間の小ストレート部6、環状突起10A、10Bの間の小ストレート部7、環状突起10Bの下方の小ストレート部8を有する。   The upper pile 33 has a small straight portion 6 between the upper end plate 42 and the annular protrusion 10A, a small straight portion 7 between the annular protrusions 10A and 10B, and a small straight portion 8 below the annular protrusion 10B.

(4) 連結継手34は、上杭32、下杭33の外周面(下端板41、上端板42)に密着できる内面を有する継手本体35の外面に円盤状突起36を突設して構成する。連結継手34の内面に、上下杭32、33を重ねた状態の嵌合溝43、43に、対応して、これに嵌合できる嵌合突起37、37を形成してある。 (4) The coupling joint 34 is configured by projecting a disk-like protrusion 36 on the outer surface of the joint body 35 having an inner surface that can be in close contact with the outer peripheral surfaces (the lower end plate 41 and the upper end plate 42) of the upper pile 32 and the lower pile 33. . On the inner surface of the coupling joint 34, fitting protrusions 37, 37 that can be fitted to the fitting grooves 43, 43 in a state where the upper and lower piles 32, 33 are overlapped are formed.

また、連結継手34は、円周方向に分割された3つの継手片34a、34aから構成する。従って、継手本体35は、3つの継手本体片35a、35aから構成し、円盤状突起36は、3つの円盤状突起片36a、36aから、夫々構成する。   The connecting joint 34 is composed of three joint pieces 34a and 34a divided in the circumferential direction. Accordingly, the joint body 35 is constituted by three joint body pieces 35a and 35a, and the disk-like protrusion 36 is constituted by three disk-like protrusion pieces 36a and 36a, respectively.

(5) 下杭33の上方に、上杭32を重ね、重ねた部分に連結継手片34a、34aを、継手本体片35a、35aの嵌合突起37、37を嵌合溝43、43に嵌挿しながら取付ける。各連結継手片34a、34aと上杭32、各連結継手片34a、34aと下杭33、を夫々溶接すると共に、必要ならば、重ねた連結継手片34a、34aを相互を溶接して連結して、上下杭32、33を連結継手片34a、34aを介して一体に接合する。以上のようにして、この発明の既製杭1を構成する(図2(a)(b))。 (5) The upper pile 32 is overlaid on the lower pile 33, the coupling joint pieces 34a and 34a are fitted into the overlapped portions, and the fitting protrusions 37 and 37 of the joint body pieces 35a and 35a are fitted into the fitting grooves 43 and 43, respectively. Install while inserting. Each joint piece 34a, 34a and the upper pile 32, each joint piece 34a, 34a and the lower pile 33 are welded, and if necessary, the overlapped joint pieces 34a, 34a are welded together and connected. Then, the upper and lower piles 32, 33 are joined together via the connecting joint pieces 34a, 34a. The ready-made pile 1 of this invention is comprised as mentioned above (FIG. 2 (a) (b)).

(6) この実施例では、下杭32を用意しておけば、任意の長さLのSC杭を組み合わせれば、この発明の既製杭1を構成できるので、使用する構築現場の地盤状況に応じて、対処が容易である。 (6) In this embodiment, by preparing a lower pile 32, by combining the SC piles of any length L 4, it is possible to configure the ready-made pile 1 of the present invention, soil conditions of the construction site to be used Depending on the situation, it is easy to deal with.

[2]基礎杭構造30の構成 [2] Configuration of foundation pile structure 30

(1) 実施例1と同様に、軸部22の下方に拡大根固め部23形成した所定の杭穴21を掘削し、杭穴21内に、既製杭1を沈設する(図3(a))。 (1) As in the first embodiment, a predetermined pile hole 21 formed in the enlarged rooted portion 23 is excavated below the shaft portion 22, and the ready-made pile 1 is set in the pile hole 21 (FIG. 3A). ).

2つの環状突起10A、10Bを含む下杭33、連結用継手34、上杭32の下端部は、杭穴21の拡大根固め部23内に位置し、拡大根固め部23内の根固め液が固化発現後、根固め液層内に埋設される。また、上杭32の中間部及び上部は、杭周固定液が充填された杭穴21の軸部22に位置し、杭周固定液層内に埋設され、基礎杭構造30を構成する(図3(a))。   The lower pile 33 including the two annular protrusions 10 </ b> A and 10 </ b> B, the coupling joint 34, and the lower ends of the upper pile 32 are located in the enlarged root consolidation portion 23 of the pile hole 21, and the root solidification liquid in the enlarged root consolidation portion 23. Is embedded in the root-solidified liquid layer after the solidification. Moreover, the intermediate part and upper part of the upper pile 32 are located in the axial part 22 of the pile hole 21 filled with the pile periphery fixing liquid, and are embed | buried in a pile periphery fixed liquid layer, and comprise the foundation pile structure 30 (FIG. 3 (a)).

(3) 基礎杭1に垂直荷重、引抜力、水平力が作用した場合の作用効果は、前記実施例1(特に図1(a)(b)、図2(a)(b)の実施例)と同様である。 (3) The effects of vertical load, pull-out force, and horizontal force acting on the foundation pile 1 are the same as those of the first embodiment (especially the first embodiment shown in FIGS. 1A and 1B and FIGS. 2A and 2B). ).

(4) 上杭32と下杭33の連結は、構築現場で行い、あるいは予め工場で連結することもできる。 (4) The upper pile 32 and the lower pile 33 can be connected at the construction site, or can be connected in advance at the factory.

[3]他の実施例 [3] Other embodiments

(1) 前記実施例において、円盤状突起36を有する連結継手を使用したが、円盤状突起を有しない通常の連結継手を使用することもできる。この場合、従来の無溶接の連結継手を使用することもできる(いずれも図示していない)。また、連結継手を使用せず、溶接のみで上下杭32、33を接合することもできる(図示していない)。 (1) In the said Example, although the coupling joint which has the disk shaped protrusion 36 was used, the normal coupling joint which does not have a disk shaped protrusion can also be used. In this case, a conventional non-welded coupling joint can also be used (none is shown). Moreover, the upper and lower piles 32 and 33 can also be joined only by welding, without using a coupling joint (not shown).

(2) 他の実施例は、実施例1と同様である。 (2) Other embodiments are the same as those in the first embodiment.

(a)〜(c)は、この発明の実施例の基礎杭構造の正面図である。(A)-(c) is a front view of the foundation pile structure of the Example of this invention. (a)〜(c)は、この発明の実施例の既製杭で、図1の基礎杭構造に対応した縦断面図である。(A)-(c) is the ready-made pile of the Example of this invention, and is a longitudinal cross-sectional view corresponding to the foundation pile structure of FIG. この発明の他の実施例で、(a)は基礎杭構造の正面図、(b)は既製杭の縦断面図である。In another embodiment of the present invention, (a) is a front view of a foundation pile structure, and (b) is a longitudinal sectional view of a ready-made pile. 図3(b)のA部拡大図で、(a)は接合前、(b)は接合後を夫々表す。It is the A section enlarged view of Drawing 3 (b), (a) expresses before joining and (b) expresses after joining, respectively. 図3(b)のB−B断面図である。It is BB sectional drawing of FIG.3 (b).

符号の説明Explanation of symbols

1 既製杭
2 既製杭の下端部
3 既製杭のコンクリート部
5 コンクリート部の段差部
10、10A、10B 環状突起(異形凹凸部)
11 環状突起の傾斜上面
12 環状突起の傾斜下面
15 鋼管
16 鋼管の下端
18 端板(上)
19 端板(下)
20 円盤状突起
21 杭穴
22 杭穴の軸部
23 杭穴の拡底部
24 杭穴の根固め部
25 根固め液層
26 杭周固定液層
30 基礎杭構造
32 上杭
33 下杭
34 連結継手
35 連結継手の継手本体
36 連結継手の円盤状突起
37 連結継手の嵌合突起
41 上杭の下端板
42 下杭の上端板
43 端板の嵌合溝
DESCRIPTION OF SYMBOLS 1 Ready-made pile 2 Lower end part of ready-made pile 3 Concrete part 5 of ready-made pile Step part 10, 10A, 10B of a concrete part Annular projection (deformed uneven part)
11 Inclined upper surface of annular projection 12 Inclined lower surface of annular projection 15 Steel pipe 16 Lower end 18 of steel pipe End plate (upper)
19 End plate (bottom)
20 Disk-like projection 21 Pile hole 22 Pile hole shaft part 23 Pile hole bottom part 24 Pile hole rooting part 25 Root consolidation liquid layer 26 Pile circumference fixed liquid layer 30 Pile structure 32 Upper pile 33 Lower pile 34 Connecting joint 35 Joint body 36 of the coupling joint Disc-shaped projection 37 of the coupling joint Mating projection 41 of the coupling joint Upper end plate 42 of the upper pile Upper end plate 43 of the lower pile End plate fitting groove

Claims (10)

コンクリート製の杭本体の下端部が所定軸径で形成され、当該下端部に異形凹凸部が形成され、前記杭本体の少なくとも上部の全部又は一部を長さLの鋼管で被覆したことを特徴とする既製杭。 The lower end portion of the concrete pile body is formed with a predetermined shaft diameter, the irregular uneven portion is formed at the lower end portion, and at least the upper part of the pile body is covered with a steel pipe having a length L. Ready-made piles. 杭本体で、鋼管を被覆していない部分の外径と、鋼管を被覆した部分の外径とを異なる径で形成したことを特徴とする請求項1に記載の既製杭。 The ready-made pile according to claim 1, wherein an outer diameter of a portion of the pile body that does not cover the steel pipe and an outer diameter of the portion that covers the steel pipe are formed with different diameters. 根固め部を有する杭穴内に埋設して使用する既製杭であって、前記既成杭の下端部が前記杭穴の根固め部に位置するように構成したことを特徴とする請求項1〜2記載の既製杭。 It is a ready-made pile which is embedded and used in a pile hole having a root-solidified portion, and is configured such that a lower end portion of the pre-made pile is located at a root-solidified portion of the pile hole. Ready-made pile as described. 深さ方向に1つ以上の強度増強部を有する杭穴内に埋設して使用する既製杭であって、鋼管の下端が、前記杭穴の強度増強部内に位置するように、前記鋼管を構成したことを特徴とする請求項1〜3のいずれか1項に記載の既製杭。 It is a ready-made pile that is used by being embedded in a pile hole having one or more strength enhancing portions in the depth direction, and the steel pipe is configured so that the lower end of the steel pipe is located in the strength enhancing portion of the pile hole. The ready-made pile of any one of Claims 1-3 characterized by the above-mentioned. 所定軸径を有する複数の単位杭を上下に接合してなる既製杭であって、
少なくとも1本の単位杭は、外周の全部又は一部を鋼管で被覆して構成し、少なくとも1本の単位杭は、外周の全部又は一部に異形凹凸部を形成して構成したことを特徴とする既製杭。
It is a ready-made pile formed by joining a plurality of unit piles having a predetermined shaft diameter up and down,
At least one unit pile is configured by covering all or part of the outer periphery with a steel pipe, and at least one unit pile is configured by forming irregular irregularities on all or part of the outer periphery. Ready-made piles.
上下に位置する単位杭の軸径を異なる径で形成したことを特徴とする請求項5記載の既製杭。 The ready-made pile according to claim 5, wherein the shaft diameters of unit piles positioned above and below are formed with different diameters. 根固め部を有する杭穴内に既製杭を埋設して構成する基礎杭構造において、前記既製杭は、所定軸径を有する複数の単位杭を上下に接合して構成し、前記単位杭の内、少なくとも1本の単位杭は、全部又は一部の外周を鋼管で被覆して構成し、少なくとも1本の単位杭は、異形凹凸部を形成して構成したことを特徴とする基礎杭構造。 In a foundation pile structure configured by burying a ready-made pile in a pile hole having a root consolidation part, the ready-made pile is configured by vertically joining a plurality of unit piles having a predetermined shaft diameter, A basic pile structure characterized in that at least one unit pile is configured by covering all or a part of the outer periphery with a steel pipe, and at least one unit pile is formed by forming irregular irregularities. 少なくとも1つの異形凹凸部を杭穴の根固め部内に位置させることを特徴とする請求項7記載の基礎杭構造。 The foundation pile structure according to claim 7, wherein at least one irregularly shaped uneven portion is positioned in a rooted portion of the pile hole. 杭穴と既製杭との間に杭周固定液層を形成し、該杭周固定液層の所定の深さに強度増強部を形成し、1つ又は複数の鋼管の上端又は下端位置、単位杭の接合位置、異形凹凸部位置の各位置の一部又は全部を前記強度増強部に埋設したことを特徴とする請求項7記載の基礎杭構造。 A pile circumference fixed liquid layer is formed between the pile hole and the ready-made pile, a strength increasing portion is formed at a predetermined depth of the pile circumference fixed liquid layer, and an upper end or lower end position of one or a plurality of steel pipes, a unit The foundation pile structure according to claim 7, wherein a part or all of each position of the joint position of the pile and the irregular uneven part position is embedded in the strength increasing part. 根固め部を有する杭穴内に既製杭を埋設して構成する基礎杭構造において、杭穴と既製杭との間に杭周固定液層を形成し、該杭周固定液層の所定の深さに強度増強部を形成し、前記既製杭は、コンクリート製の杭本体の少なくとも上部を長さLの鋼管で被覆すると共に、前記コンクリート製の杭本体で、前記鋼管の上端又は下端に近接して異形凹凸部を形成して、前記異形凹凸部及び前記鋼管の上端又は下端を、前記根固め部内又は強度増強部内に、埋設したことを特徴とした基礎杭構造。 In the foundation pile structure constructed by burying the ready-made pile in the pile hole having the root consolidation part, a pile circumferential fixed liquid layer is formed between the pile hole and the ready-made pile, and the predetermined depth of the pile circumferential fixed liquid layer Forming a strength increasing portion, and the ready-made pile covers at least an upper part of a concrete pile main body with a steel pipe having a length L, and is close to the upper end or the lower end of the steel pipe in the concrete pile main body. A foundation pile structure characterized by forming irregular irregularities, and embedding the irregular irregularities and the upper end or lower end of the steel pipe in the root hardening portion or the strength increasing portion.
JP2005224758A 2005-08-02 2005-08-02 Ready-made pile and foundation pile structure Pending JP2007039955A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010248851A (en) * 2009-04-20 2010-11-04 Toda Constr Co Ltd Precast soldier beam for earth retaining and method of forming the same
JP2015218516A (en) * 2014-05-20 2015-12-07 三谷セキサン株式会社 Construction method of foundation pile whose pile head is reinforced, foundation pile structure whose pile head is reinforced

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010248851A (en) * 2009-04-20 2010-11-04 Toda Constr Co Ltd Precast soldier beam for earth retaining and method of forming the same
JP2015218516A (en) * 2014-05-20 2015-12-07 三谷セキサン株式会社 Construction method of foundation pile whose pile head is reinforced, foundation pile structure whose pile head is reinforced

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