JP5684069B2 - Pile structure - Google Patents

Pile structure Download PDF

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JP5684069B2
JP5684069B2 JP2011171631A JP2011171631A JP5684069B2 JP 5684069 B2 JP5684069 B2 JP 5684069B2 JP 2011171631 A JP2011171631 A JP 2011171631A JP 2011171631 A JP2011171631 A JP 2011171631A JP 5684069 B2 JP5684069 B2 JP 5684069B2
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pile
ready
root
plate
outer diameter
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JP2013036188A (en
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俊昌 長尾
俊昌 長尾
渡邊　徹
渡邊　　徹
金田　和浩
和浩 金田
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Taisei Corp
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Description

本発明は、杭構造に関する。詳しくは、構造物の基礎を支持する杭の構造に関する。   The present invention relates to a pile structure. In detail, it is related with the structure of the pile which supports the foundation of a structure.

従来より、構造物の基礎には杭が用いられるが、地震時にこの杭に作用する引抜き力に抵抗するため、引抜き耐力を高めた杭が知られている。
構造物の基礎を支持する杭には鉛直荷重により常時圧縮力が作用しているが、地震時には、水平荷重により曲げ応力やせん断応力が生じるとともに、転倒モーメントにより引張力が生じ、杭に引抜き方向の力が作用する。 Conventionally, piles are used for the foundations of structures, but piles with increased pulling strength are known in order to resist pulling forces acting on these piles during an earthquake.
The pile that supports the foundation of the structure is always subjected to compressive force due to the vertical load, but in the event of an earthquake, the horizontal load causes bending stress and shear stress, and the overturning moment causes tensile force. The force of acts.

上述の水平荷重や鉛直荷重に対して杭が所定の抵抗力を発揮するためには、地盤との応力伝達上、所定の杭間隔が必要であるが、大きな地震力に抵抗するためには、杭の本数を増やすか、もしくは杭を大口径にする必要があり、杭の鉄筋量が増大するとともに基礎スラブも厚くなって、基礎にかかるコストが嵩む場合がある。
そこで、基礎にかかるコストを削減するために、杭の内部に引張力を負担するアンカー材を埋設することで、杭径や鉄筋量を増さずに大きな引張力に抵抗する方法が提案されている（特許文献１参照）。 In order for the pile to exert a predetermined resistance against the horizontal load and the vertical load described above, a predetermined pile interval is necessary for stress transmission with the ground, but in order to resist a large seismic force, It is necessary to increase the number of piles or to make the piles have a large diameter, which increases the amount of reinforcing bars of the piles and thickens the foundation slab, which may increase the cost of the foundations.
Therefore, in order to reduce the cost of the foundation, a method has been proposed in which an anchor material bearing the tensile force is buried inside the pile, thereby resisting a large tensile force without increasing the pile diameter or the amount of reinforcing bars. (See Patent Document 1).

この特許文献では、杭は、先端部分が拡底された杭穴と、当該杭穴の拡底部分に設けられた根固め層と、杭穴に挿入されて根固め層に定着した中空の既製杭と、この既製杭の先端面に設けられた支圧板と、既製杭に挿通されて支圧板に連結されたアンカー材と、を備える。この既製杭の先端部分の外周面には、環状のリブが形成されている。   In this patent document, a pile includes a pile hole whose tip is widened, a root consolidation layer provided at the bottom wide portion of the pile hole, and a hollow ready-made pile that is inserted into the pile hole and fixed to the root consolidation layer. The bearing plate provided on the front end surface of the ready-made pile and the anchor member inserted through the ready-made pile and connected to the bearing plate. An annular rib is formed on the outer peripheral surface of the tip portion of the ready-made pile.

このような杭構造によれば、杭穴の拡底部分に形成された根固め層が既製杭に引抜き力が作用すると、既製杭の周面摩擦力に加えて、既製杭のリブが根固め層に係止することにより、引抜き力に抵抗する。   According to such a pile structure, when the pulling force acts on the ready-made pile, the ribbed layer of the ready-made pile has a solidified layer in addition to the peripheral frictional force of the ready-made pile. By resisting to, it resists the pulling force.

特開２００２−１４６７８４号公報JP 2002-146784 A

しかしながら、引抜き力に対して主として抵抗する部分は既製杭周囲の摩擦力であるが、既製杭は表面が平滑であるため、アンカー材を設けたにもかかわらず引抜き抵抗力が発揮されにくい。
また、既製杭の先端部分の外周面にリブのような突起物を設けても、実際に引抜力が作用すると、既製杭が根固め層から抜けてしまうおそれがある。
さらに、支圧板が既製杭の先端に固定されていると、アンカー材が既製杭と一体化されているため、既製杭本体の引き抜き抵抗しか得られず、既製杭先端部の根固め層を十分に活用できず、高い引抜き耐力が得られない可能性もある。 However, the portion that mainly resists the pulling force is the frictional force around the ready-made pile, but the ready-made pile has a smooth surface, so that it is difficult to exert the pulling resistance force despite the provision of the anchor material.
Moreover, even if protrusions such as ribs are provided on the outer peripheral surface of the tip portion of the ready-made pile, if the pulling force actually acts, the ready-made pile may fall out of the rooting layer.
Furthermore, if the bearing plate is fixed to the tip of the ready-made pile, the anchor material is integrated with the ready-made pile, so only the pull-out resistance of the ready-made pile body can be obtained, and the solidified layer at the tip of the ready-made pile is sufficient. May not be able to be utilized for high pullout strength.

本発明は、杭先端の根固め部を最大限に活用することで、高い引抜き耐力を確実に得ることができる杭構造を提供することを目的とする。   An object of this invention is to provide the pile structure which can obtain a high pulling-out yield strength reliably by utilizing the root-hardening part of a pile front-end | tip to the maximum.

請求項１に記載の杭構造は、構造物を支持する杭構造であって、地盤に掘削された杭穴と、当該杭穴の先端部分に充填された根固め液が固化して築造された根固め部と、前記杭穴に挿入された中空の既製杭と、前記根固め部に埋め込まれて前記既製杭の先端面より下側に離隔して配置されたプレートと、下端側を前記プレートに連結されるとともに、上端側を前記既製杭の杭体に定着させる緊張力が導入された連結部材と、を備え、前記根固め部の外径は前記既製杭の外径より大きく、該根固め部は前記杭穴の拡底部分に形成されており、前記プレートの外径は、前記既製杭の外径より大きいことを特徴とする。
The pile structure according to claim 1 is a pile structure that supports a structure, and is built by solidifying a pile hole excavated in the ground and a root-filling liquid filled in a tip portion of the pile hole. A root-set portion, a hollow ready-made pile inserted into the pile hole, a plate embedded in the root-set portion and spaced apart from the tip surface of the ready-made pile, and a lower end side of the plate coupled to Rutotomoni includes a connecting member tension is introduced for fixing the upper end side to the pile body of the prefabricated pile, the outer diameter of the root consolidated portion is larger than the outer diameter of the prefabricated pile,該根The solidified portion is formed in the expanded bottom portion of the pile hole, and the outer diameter of the plate is larger than the outer diameter of the ready-made pile.

この発明によれば、既製杭の先端より下側の根固め部内にプレートを配置し、このプレートに連結部材を連結した。ここで、プレートを既製杭の先端面より下側に離隔して配置したので、根固め部の一部が既製杭とプレートとの間に挟まれ、引抜き力に対して根固め部のせん断抵抗を利用できる。また、従来のように既製杭の先端にプレートを固定した場合に比べて、プレートがより根固め部の底に近くなり、引抜きが生じた際に連結部材に作用する引張力が、根固め部のより深い位置から上方にコーン状に広がって根固め部の周辺まで確実に伝達されるので、根固め部の引抜き抵抗能力を最大限に活用できる。
よって、杭に作用する引抜き力を、既製杭の周面摩擦による抵抗と、連結部材およびプレートを介した根固め部による抵抗と、で負担するから、高い引抜き耐力を確実に得ることができる。 According to the present invention, the plate is disposed in the root consolidation part below the tip of the ready-made pile, and the connecting member is connected to the plate. Here, because the plate is spaced apart from the tip of the ready-made pile, a part of the root-solidified part is sandwiched between the ready-made pile and the plate, and the shear resistance of the root-solidified part against the pulling force Can be used. In addition, compared to the case where the plate is fixed to the tip of a prefabricated pile as in the past, the plate is closer to the bottom of the root solidified portion, and the tensile force acting on the connecting member when pulling out is Since it spreads in a cone shape upward from a deeper position of the root and is reliably transmitted to the periphery of the root consolidation part, it is possible to make maximum use of the resistance to pulling out the root consolidation part.
Therefore, since the pulling force acting on the pile is borne by the resistance caused by the peripheral surface friction of the ready-made pile and the resistance caused by the rooting portion via the connecting member and the plate, a high pulling strength can be reliably obtained.

請求項２に記載の杭構造は、構造物を支持する杭構造であって、地盤に掘削された杭穴と、当該杭穴の先端部分に充填された根固め液が固化して築造された根固め部と、前記杭穴に挿入された中空の既製杭と、前記根固め部に埋め込まれて前記既製杭の先端面より下側に離隔して配置されたプレートと、下端側を前記プレートに連結されるとともに、上端側は前記既製杭の内部を挿通させて、該既製杭の上端側に設けられた基礎に定着させる緊張力が導入された連結部材と、を備え、前記根固め部の外径は前記既製杭の外径より大きく、該根固め部は前記杭穴の拡底部分に形成されており、前記プレートの外径は、前記既製杭の外径より大きいことを特徴とする。
The pile structure according to claim 2 is a pile structure that supports a structure, and is built by solidifying a pile hole excavated in the ground and a tip filling portion filled in the tip portion of the pile hole. wherein the roots consolidated portion, a hollow prefabricated pile inserted into the pile hole, and the plate which is spaced below the front end surface of the prefabricated pile is embedded in the root hardened portion, the lower end Rutotomoni is connected to the plate, and the upper end is inserted inside of the prefabricated pile, comprising a connecting member tension is introduced to fix the foundation provided on the upper end of the該既made pile, said root compaction The outer diameter of the part is larger than the outer diameter of the ready-made pile, the root-solidified part is formed in the bottom expanded part of the pile hole, and the outer diameter of the plate is larger than the outer diameter of the ready-made pile. To do.

この発明によれば、既製杭の先端より下側の根固め部内にプレートを配置し、このプレートに連結部材を連結した。ここで、プレートを既製杭の先端面より下側に離隔して配置したので、根固め部の一部が既製杭とプレートとの間に挟まれ、引抜き力に対して根固め部のせん断抵抗を利用できる。また、従来のように既製杭の先端にプレートを固定した場合に比べて、プレートがより根固め部の底に近くなり、引抜きが生じた際に連結部材に作用する引張力が、根固め部のより深い位置から上方にコーン状に広がって根固め部の周辺まで確実に伝達されるので、根固め部の引抜き抵抗能力を最大限に活用できる。
よって、杭に作用する引抜き力を、既製杭の周面摩擦による抵抗と、これと並列的に機能する連結部材およびプレートを介した根固め部による抵抗と、で負担するから、高い引抜き耐力を確実に得ることができる。 According to the present invention, the plate is disposed in the root consolidation part below the tip of the ready-made pile, and the connecting member is connected to the plate. Here, because the plate is spaced apart from the tip of the ready-made pile, a part of the root-solidified part is sandwiched between the ready-made pile and the plate, and the shear resistance of the root-solidified part against the pulling force Can be used. In addition, compared to the case where the plate is fixed to the tip of a prefabricated pile as in the past, the plate is closer to the bottom of the root solidified portion, and the tensile force acting on the connecting member when pulling out is Since it spreads in a cone shape upward from a deeper position of the root and is reliably transmitted to the periphery of the root consolidation part, it is possible to make maximum use of the resistance to pulling out the root consolidation part.
Therefore, since the pulling force acting on the pile is borne by the resistance due to the peripheral surface friction of the ready-made pile and the resistance by the rooting part via the connecting member and plate functioning in parallel with this, a high pulling strength is achieved. You can definitely get it.

本発明では、前記連結部材の上端側は、緊張力が導入された状態で、前記基礎に埋設されていることが好ましい。 In the present invention, the upper end side of the connecting member in a state where tension is introduced, which is preferably embedded in the foundation.

この発明によれば、連結部材に緊張力を導入したので、基礎の小さな浮上がり変形に対しても根固め部が有効に機能して、既製杭の周面摩擦力と相乗的に抵抗するので、引抜き耐力をより向上できる。
なお、連結材に大きな緊張力を加えることは、常時で大きな圧縮力を受けている根固め部にさらに圧縮力を導入することになるため、好ましくない。したがって、緊張力の大きさは、根固め部の強度に影響を与えない程度、例えば連結部材にたるみが生じない程度の大きさとするのが好ましい。 According to the present invention, since the tension force is introduced into the connecting member, the rooting portion functions effectively even with a small lifting deformation of the foundation, and synergistically resists the peripheral friction force of the ready-made pile. The pulling strength can be further improved.
In addition, it is not preferable to apply a large tension force to the connecting member because a compressive force is further introduced into the rooting portion that is constantly receiving a large compressive force. Therefore, it is preferable that the magnitude of the tension force is set to such a level that does not affect the strength of the root-sealed portion, for example, does not cause slack in the connecting member.

本発明では、前記根固め部の少なくとも上端部は、地盤の支持層の中に位置していることが好ましい。 In the present invention, it is preferable that at least an upper end portion of the root hardening portion is located in a support layer of the ground.

この発明によれば、根固め部の少なくとも上端部を地盤の支持層の中に位置させたので、根固め層がより強固に地盤に定着するので、引抜き耐力をさらに向上できる。   According to the present invention, since at least the upper end portion of the root consolidation portion is positioned in the ground support layer, the root consolidation layer is more firmly fixed on the ground, so that the pulling strength can be further improved.

本発明では、前記プレートは、円盤状であり、当該プレートの外径は、前記既製杭の外径以上であることが好ましい。 In the present invention, the plate is a disk-shaped, the outer diameter of the plate is preferably the a equal to or greater than the outer diameter of the ready-made pile.

この発明によれば、プレートを円盤状とし、このプレートの外径を既製杭の外径以上としたので、連結部材に作用する引張力が根固め部の周辺までより確実に伝達されるようになり、引抜き耐力をさらに向上できる。   According to the present invention, since the plate has a disk shape and the outer diameter of the plate is equal to or larger than the outer diameter of the ready-made pile, the tensile force acting on the connecting member is more reliably transmitted to the periphery of the solidified portion. Thus, the pulling strength can be further improved.

本発明によれば、既製杭の先端より下側の根固め部内にプレートを配置し、このプレートに連結部材を連結した。ここで、プレートを既製杭の先端面より下側に離隔して配置したので、根固め部の一部が既製杭とプレートとの間に挟まれ、引抜き力に対して根固め部のせん断抵抗を利用できる。また、従来のように既製杭の先端にプレートを固定した場合に比べて、プレートがより根固め部の底に近くなり、引抜きが生じた際に連結部材に作用する引張力が、根固め部のより深い位置から上方にコーン状に広がって根固め部の周辺まで確実に伝達される。よって、根固め部の引抜き抵抗能力を最大限に活用できるようになり、高い引抜き耐力を確実に得ることができる。   According to this invention, the plate was arrange | positioned in the root consolidation part below the front-end | tip of a ready-made pile, and the connection member was connected with this plate. Here, because the plate is spaced apart from the tip of the ready-made pile, a part of the root-solidified part is sandwiched between the ready-made pile and the plate, and the shear resistance of the root-solidified part against the pulling force Can be used. In addition, compared to the case where the plate is fixed to the tip of a prefabricated pile as in the past, the plate is closer to the bottom of the root solidified portion, and the tensile force acting on the connecting member when pulling out is It spreads in the shape of a cone from a deeper position and is reliably transmitted to the periphery of the root consolidation part. Therefore, it becomes possible to make maximum use of the pulling resistance capability of the rooting portion, and a high pulling strength can be obtained with certainty.

本発明の一実施形態に係る杭構造の杭の側面図および断面図である。It is the side view and sectional drawing of a pile of a pile structure concerning one embodiment of the present invention. 前記実施形態に係る杭を構築する手順を説明するための図である。It is a figure for demonstrating the procedure which builds the pile which concerns on the said embodiment. 本発明の変形例に係る杭構造の杭の側面図である。It is a side view of the pile of the pile structure which concerns on the modification of this invention.

以下、本発明の一実施形態について、図面を参照しながら説明する。
図１は、本発明の一実施形態に係る杭の側面図および断面図である。
杭１は、建物の基礎２を支持するものであり、基礎２の下面から下方に向かって鉛直方向に延びている。
杭１は、地盤３に掘削された杭穴１０と、この杭穴１０の先端部分に築造された根固め部１２と、杭穴１０に挿入された中空の鉄筋コンクリート製の既製杭２０と、根固め部１２に埋め込まれて定着した支圧プレート３０と、既製杭２０の内部に挿通されて支圧プレート３０に連結される連結部材３１と、を備える。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Drawing 1 is a side view and a sectional view of a pile concerning one embodiment of the present invention.
The pile 1 supports the foundation 2 of the building, and extends downward from the lower surface of the foundation 2 in the vertical direction.
The pile 1 includes a pile hole 10 excavated in the ground 3, a root consolidation part 12 built at the tip of the pile hole 10, a ready-made pile 20 made of hollow reinforced concrete inserted in the pile hole 10, a root A bearing plate 30 embedded and fixed in the hardened portion 12 and a connecting member 31 inserted into the ready-made pile 20 and coupled to the bearing plate 30 are provided.

杭穴１０の先端部分（下端部分）は拡底されており、拡底部分１１が形成されている。この拡底部分１１は、地盤３の支持層に形成されている。
根固め部１２は、杭穴１０の拡底部分１１に充填された根固め液としてのセメントミルクが固化して築造されている。このセメントミルクは、ある程度の強度を安定して得られるものである。これにより、この根固め部１２の全体が支持層の中に位置しており、根固め部１２の外径は、既製杭２０の外径よりも大きくなっている。 The front end portion (lower end portion) of the pile hole 10 is widened, and the widened portion 11 is formed. The widened portion 11 is formed on the support layer of the ground 3.
The root hardening part 12 is constructed by solidifying cement milk as a root hardening liquid filled in the bottom expanded part 11 of the pile hole 10. This cement milk can be obtained with a certain degree of strength stably. Thereby, the whole root consolidation part 12 is located in a support layer, and the outer diameter of the root consolidation part 12 is larger than the outer diameter of the ready-made pile 20. FIG.

連結部材３１の上端側（基端側）は、緊張力が導入された状態で、プレート３２を介して建物の基礎２に定着している。
既製杭２０の先端部分は、根固め部１２にある程度埋め込まれている。なお、この既製杭２０の埋め込み深さは、適宜決定されてよい。 The upper end side (base end side) of the connecting member 31 is fixed to the foundation 2 of the building through the plate 32 in a state where the tension force is introduced.
The tip portion of the ready-made pile 20 is embedded in the root consolidation portion 12 to some extent. In addition, the embedding depth of this ready-made pile 20 may be determined suitably.

支圧プレート３０は既製杭２０の先端面より下側に離隔しており、これにより、根固め部１２の一部が既製杭２０と支圧プレート３０との間に挟まれている。支圧プレート３０は、円盤状であり、この支圧プレート３０の外径は、既製杭２０の外径より大きくなっている。なお、この支圧プレート３０の外形寸法は、想定される引抜き力に応じて適宜決定されてよい。
連結部材３１の材質および断面積は、伝達する引抜き力の大きさと既製杭２０との軸剛性とを考慮して、適宜決定されてよい。 The bearing plate 30 is spaced downward from the tip end surface of the ready-made pile 20, whereby a part of the rooting portion 12 is sandwiched between the ready-made pile 20 and the bearing plate 30. The bearing plate 30 has a disk shape, and the outer diameter of the bearing plate 30 is larger than the outer diameter of the ready-made pile 20. Note that the outer dimensions of the bearing plate 30 may be appropriately determined according to an assumed drawing force.
The material and the cross-sectional area of the connecting member 31 may be appropriately determined in consideration of the magnitude of the drawing force to be transmitted and the axial rigidity of the ready-made pile 20.

以上の杭１は、以下の手順で構築される。
まず、地上にて既製杭２０を現場に搬入し、この既製杭２０の先端側に支圧プレート３０を配置し、さらに、連結部材３１を既製杭２０に挿通して支圧プレート３０に連結しておく。このようにして、既製杭２０、支圧プレート３０、および連結部材３１を一体化させておく。 The above pile 1 is constructed in the following procedure.
First, the ready-made pile 20 is carried to the site on the ground, the support plate 30 is arranged on the tip side of the ready-made pile 20, and the connecting member 31 is inserted into the ready-made pile 20 and connected to the support plate 30. Keep it. In this way, the ready-made pile 20, the bearing plate 30, and the connecting member 31 are integrated.

その後、図２（ａ）に示すように、杭打ち機４０により、先端部分に拡底部分１１が形成された杭穴１０を形成する。その後、杭打ち機４０の掘削ドリルの先端からセメントミルクを吐出して拡底部分１１にセメントミルクを充填し、掘削ドリルを上下させて良く撹拌する。その後、掘削ドリルを引き上げながら、掘削ドリルの先端から杭周充填液を吐出して、杭穴１０内に充填していく。   Then, as shown to Fig.2 (a), the pile hole 10 in which the bottom expansion part 11 was formed in the front-end | tip part is formed with the pile driving machine 40. As shown in FIG. Thereafter, the cement milk is discharged from the tip of the drilling drill of the pile driving machine 40 to fill the expanded portion 11 with the cement milk, and the drilling drill is moved up and down and stirred well. Thereafter, while pulling up the excavation drill, the pile circumference filling liquid is discharged from the tip of the excavation drill, and the pile hole 10 is filled.

続いて、図２（ｂ）に示すように、クレーン４１により、地組みした既製杭２０を杭穴１０に挿入し、地組みした既製杭２０の支圧プレート３０が拡底部分１１の内部に位置するようにする。また、既製杭２０を杭穴１０に挿入することにより、少なくとも既製杭２０の周囲には杭周充填液が充填される。   Subsequently, as shown in FIG. 2 (b), the prefabricated pile 20 is inserted into the pile hole 10 by the crane 41, and the bearing plate 30 of the prefabricated prefabricated pile 20 is positioned inside the expanded bottom portion 11. To do. Moreover, by inserting the ready-made pile 20 into the pile hole 10, at least the periphery of the ready-made pile 20 is filled with the pile circumference filling liquid.

その後、セメントミルクが固化して根固め部１２が築造されると、図２（ｃ）に示すように、この根固め部１２に支圧プレート３０が埋め込まれることになる。また、既製杭２０の周囲の杭周充填液が固化して、既製杭２０が地盤３に定着する。
その後、基礎２を構築し、連結部材３１に緊張力を導入して、この緊張力を導入した状態で連結部材３１の上端部分を基礎２に定着させる。 Then, when cement milk solidifies and the root consolidation part 12 is built, as shown in FIG.2 (c), the bearing plate 30 will be embedded in this root consolidation part 12. FIG. Moreover, the pile periphery filling liquid around the ready-made pile 20 is solidified, and the ready-made pile 20 is fixed to the ground 3.
Thereafter, the foundation 2 is constructed, a tension force is introduced into the connecting member 31, and the upper end portion of the connecting member 31 is fixed to the foundation 2 in a state where this tension force is introduced.

本実施形態によれば、以下のような効果がある。
（１）既製杭２０の先端より下側の根固め部１２内に支圧プレート３０を配置し、この支圧プレート３０に連結部材３１を連結した。ここで、支圧プレート３０を既製杭２０の先端面より下側に離隔して配置したので、根固め部１２の一部が既製杭２０と支圧プレート３０との間に挟まれ、引抜き力に対して根固め部１２のせん断抵抗を利用できる。また、従来のように先端にプレートを固定した場合に比べて、プレートがより根固め部１２の底に近くなり、連結部材３１に作用する引張力が、根固め部１２のより深い位置から上方にコーン状に広がって根固め部１２の周辺まで確実に伝達されるので、根固め部の引抜き抵抗能力を最大限に活用できる。
よって、杭１に作用する引抜き力を、既製杭２０の周面摩擦による抵抗と、これと並列的に機能する連結部材３１および支圧プレート３０を介した根固め部１２による抵抗と、で負担するから、高い引抜き耐力を確実に得ることができる。 According to this embodiment, there are the following effects.
(1) The bearing plate 30 is disposed in the root consolidation portion 12 below the tip of the ready-made pile 20, and the connecting member 31 is coupled to the bearing plate 30. Here, since the bearing plate 30 is spaced apart from the front end surface of the ready-made pile 20, a part of the rooting portion 12 is sandwiched between the ready-made pile 20 and the supporting plate 30, and the pulling force On the other hand, the shear resistance of the root hardening part 12 can be utilized. Further, compared to the case where the plate is fixed to the tip as in the conventional case, the plate is closer to the bottom of the root consolidation portion 12, and the tensile force acting on the connecting member 31 is upward from a deeper position of the root consolidation portion 12. Since it spreads in a cone shape and is reliably transmitted to the periphery of the root consolidation part 12, it is possible to make maximum use of the pulling resistance ability of the root consolidation part.
Therefore, the pulling force acting on the pile 1 is burdened by the resistance caused by the peripheral friction of the ready-made pile 20 and the resistance caused by the rooting portion 12 via the connecting member 31 and the bearing plate 30 that function in parallel with this. Therefore, a high pulling strength can be reliably obtained.

（２）連結部材３１に緊張力を導入したので、小さな浮上がり変形に対しても根固め部１２が有効に機能して、既製杭２０の周面摩擦力と相乗的に抵抗するので、引抜き耐力をさらに向上できる。   (2) Since a tension force is introduced into the connecting member 31, the rooting portion 12 functions effectively even with a small lifting deformation, and synergistically resists the peripheral surface frictional force of the ready-made pile 20, so that it is pulled out. Yield can be further improved.

（３）根固め部１２の全体を地盤３の支持層の中に位置させたので、根固め部１２がより強固に地盤３に定着するので、引抜き耐力をさらに向上できる。   (3) Since the entire root consolidation portion 12 is positioned in the support layer of the ground 3, the root consolidation portion 12 is firmly fixed on the ground 3, so that the pulling strength can be further improved.

（４）支圧プレート３０を円盤状とし、この支圧プレート３０の外径を既製杭２０の外径より大きくしたので、連結部材３１に作用する引張力が根固め部１２の周辺までより確実に伝達されるようになり、引抜き耐力をさらに向上できる。   (4) Since the bearing plate 30 has a disk shape, and the outer diameter of the bearing plate 30 is larger than the outer diameter of the ready-made pile 20, the tensile force acting on the connecting member 31 is more reliable up to the periphery of the solidified portion 12. The pulling strength can be further improved.

なお、本発明は前記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれるものである。
例えば、本実施形態では既製杭２０を鉄筋コンクリート造としたが、これに限らず、既製杭を鋼管杭としてもよい。
また、本実施形態では、連結部材３１の上端側を基礎２に定着したが、これに限らない。例えば鋼管杭など、既製杭が十分な引き抜き耐力を有している場合には、図３に示すように、連結部材３１Ａの上端側を既製杭２０の杭体に連結してもよい。 It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, although the ready-made pile 20 is made of reinforced concrete in this embodiment, the ready-made pile may be a steel pipe pile.
Moreover, in this embodiment, although the upper end side of the connection member 31 was fixed to the foundation 2, it is not restricted to this. For example, when a ready-made pile such as a steel pipe pile has sufficient pulling strength, the upper end side of the connecting member 31A may be connected to the pile body of the ready-made pile 20 as shown in FIG.

また、本実施形態では、拡底部分１１にセメントミルクを充填して、固化したセメントミルクで根固め部１２を築造したが、これに限らない。例えば、掘削ドリルの先端からセメントミルクを吐出して、吐出したセメントミルクと掘削した土とを攪拌してソイルセメントとし、固化したソイルセメントを根固め部としてもよい。   In this embodiment, cemented milk is filled in the expanded bottom portion 11 and the root hardening portion 12 is constructed with the solidified cement milk. However, the present invention is not limited to this. For example, cement milk may be discharged from the tip of a drilling drill, the discharged cement milk and the excavated soil may be stirred to form a soil cement, and the solidified soil cement may be used as a rooting portion.

１、１Ａ…杭
２…基礎
３…地盤
１０…杭穴
１１…拡底部分
１２…根固め部
２０…既製杭
３０…支圧プレート
３１、３１Ａ…連結部材
３２…プレート
４０…杭打ち機
４１…クレーン DESCRIPTION OF SYMBOLS 1, 1A ... Pile 2 ... Foundation 3 ... Ground 10 ... Pile hole 11 ... Expanded bottom part 12 ... Rooting part 20 ... Ready-made pile 30 ... Bearing plate 31, 31A ... Connecting member 32 ... Plate 40 ... Pile driver 41 ... Crane

Claims (2)

構造物を支持する杭構造であって、
地盤に掘削された杭穴と、当該杭穴の先端部分に充填された根固め液が固化して築造された根固め部と、前記杭穴に挿入された中空の既製杭と、前記根固め部に埋め込まれて前記既製杭の先端面より下側に離隔して配置されたプレートと、下端側を前記プレートに連結されるとともに、上端側を前記既製杭の杭体に定着させる緊張力が導入された連結部材と、を備え、
前記根固め部の外径は前記既製杭の外径より大きく、該根固め部は前記杭穴の拡底部分に形成されており、
前記プレートの外径は、前記既製杭の外径より大きいことを特徴とする杭構造。 A pile structure that supports the structure,
A pile hole excavated in the ground, a root-solidified portion formed by solidifying a root-solidifying liquid filled in a tip portion of the pile-hole, a hollow ready-made pile inserted into the pile-hole, and the root-solidified a plate which is spaced below the front end surface of the prefabricated pile is embedded in part, tension is to fix Rutotomoni is connected to the lower end to the plate, the upper side pile body of the prefabricated pile An introduced connecting member,
The outer diameter of the root consolidation part is larger than the outer diameter of the ready-made pile, and the root consolidation part is formed in the expanded bottom portion of the pile hole ,
A pile structure characterized in that an outer diameter of the plate is larger than an outer diameter of the ready-made pile. 構造物を支持する杭構造であって、
地盤に掘削された杭穴と、当該杭穴の先端部分に充填された根固め液が固化して築造された根固め部と、前記杭穴に挿入された中空の既製杭と、前記根固め部に埋め込まれて前記既製杭の先端面より下側に離隔して配置されたプレートと、下端側を前記プレートに連結されるとともに、上端側は前記既製杭の内部を挿通させて、該既製杭の上端側に設けられた基礎に定着させる緊張力が導入された連結部材と、を備え、
前記根固め部の外径は前記既製杭の外径より大きく、該根固め部は前記杭穴の拡底部分に形成されおり、
前記プレートの外径は、前記既製杭の外径より大きいことを特徴とする杭構造。
A pile structure that supports the structure,
A pile hole excavated in the ground, a root-solidified portion formed by solidifying a root-solidifying liquid filled in a tip portion of the pile-hole, a hollow ready-made pile inserted into the pile-hole, and the root-solidified a plate which is spaced below the front end surface of the prefabricated pile is embedded in part, by Rutotomoni coupled the lower end to the plate, the upper side is inserted inside of the prefabricated pile, the A connecting member introduced with a tension force to be fixed to the foundation provided on the upper end side of the ready-made pile ,
The outer diameter of the root consolidation part is larger than the outer diameter of the ready-made pile, and the root consolidation part is formed in the expanded bottom portion of the pile hole ,
A pile structure characterized in that an outer diameter of the plate is larger than an outer diameter of the ready-made pile.
JP2011171631A 2011-08-05 2011-08-05 Pile structure Expired - Fee Related JP5684069B2 (en)

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CN111021395A (en) * 2019-12-26 2020-04-17 四川电力设计咨询有限责任公司 Composite foundation suitable for upper-soil-lower-rock stratum structure

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ES2552588B1 (en) * 2014-05-29 2016-09-08 2Pe Pilotes, S.L. Device for anchoring a deep support for a foundation and procedure for said anchor

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JPS62268423A (en) * 1986-05-16 1987-11-21 Kajima Corp Construction work of underground pile used in common for earth anchor
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US7390144B2 (en) * 2006-02-02 2008-06-24 Nova Group Inc. Pre-cast/pre-stressed concrete and steel pile and method for installation

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