JP3054389B2 - Prefabricated steel pile with prefabricated pile - Google Patents
Prefabricated steel pile with prefabricated pileInfo
- Publication number
- JP3054389B2 JP3054389B2 JP9240265A JP24026597A JP3054389B2 JP 3054389 B2 JP3054389 B2 JP 3054389B2 JP 9240265 A JP9240265 A JP 9240265A JP 24026597 A JP24026597 A JP 24026597A JP 3054389 B2 JP3054389 B2 JP 3054389B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- expanded
- bars
- hole
- reinforcing bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、コンクリートパイ
ル等の既成杭の下端に鉄骨により補強された杭径より大
きい拡底部を設ける拡底杭、詳細には杭下端の拡底部が
鉄骨を介して的確に補強されたコンクリートにより築造
され、この拡底部面積のすべてが杭の支持力算定におい
て有効断面積と認められるような、既成杭による有鉄骨
拡底杭に関するものである。BACKGROUND OF THE INVENTION The present invention relates to an expanded pile in which an enlarged pile having a diameter larger than the diameter of a pile reinforced by a steel frame is provided at the lower end of an existing pile such as a concrete pile. The present invention relates to a steel-filled pile with existing piles, which is constructed with concrete reinforced in this way, and the entire area of the expanded bottom is recognized as an effective cross-sectional area in the calculation of the bearing capacity of the pile.
【０００２】[0002]
【従来の技術】従来より、杭の支持力及び引き抜き抵抗
を増加させるための手段として、杭の下端に拡底部を設
ける拡底杭が広く知られている。この場合、拡底杭とし
ては、現場打ち杭の下端に拡底部を設けるものと、既成
杭の下端に拡底部を設けるものとがあり、いずれも予め
杭孔の底部に杭径よりも大径な孔底拡開部を掘削してか
ら、この孔底拡開部内にセメントミルクあるいはコンク
リート等を打設して拡底部を設ける。2. Description of the Related Art Conventionally, as a means for increasing the supporting force and pull-out resistance of a pile, an expanded pile having an expanded bottom at the lower end of the pile has been widely known. In this case, there are two types of expanded piles: one with an expanded bottom at the lower end of the cast-in-place pile, and another with an expanded bottom at the lower end of the existing pile, both of which have a diameter larger than the diameter of the pile beforehand at the bottom of the pile hole. After excavating the hole bottom enlarged portion, cement milk or concrete is poured into the hole bottom enlarged portion to provide the enlarged bottom portion.
【０００３】この拡底杭としては、杭の下端に設けるコ
ンクリート拡底部が単に無鉄筋の状態で杭径よりも拡大
されているというだけでは、杭の限界支持力には対応で
きず、かつ引き抜き抵抗にも対応できないという問題が
あり、そのため従来より、孔底拡開部内で鉄筋もしくは
鉄筋に代わる補強材を杭径よりも大きくなるように拡大
させてからセメントミルクあるいはコンクリート等を打
設して、鉄筋等の補強材により補強された杭径よりも大
きい拡底部を設ける手段が提唱されている。[0003] As for this expanded pile, simply increasing the concrete expanded portion provided at the lower end of the pile beyond the diameter of the pile in a state of no rebar is not enough to cope with the limit bearing capacity of the pile, and the pull-out resistance is not increased. There is also a problem that it can not cope with it, so conventionally, in the hole bottom expansion part, reinforcing material in place of the reinforcing bar or reinforcing bar is expanded so as to be larger than the pile diameter, and then cement milk or concrete is poured, Means for providing an enlarged bottom portion larger than a pile diameter reinforced by a reinforcing material such as a reinforcing bar has been proposed.
【０００４】また、孔底拡開部内で鉄筋もしくは補強材
を杭径よりも大きくなるように拡大させる手段にも、孔
内に挿入した既成杭あるいはロッド等を孔内で回転する
ことで杭の下端に設けられた鉄筋もしくは補強材を拡大
する方式、例えば特開平６−２８７９４３号と、鉄筋篭
もしくは既成杭あるいはロッド等を押し下げることで鉄
筋もしくは補強材を拡大する方式、例えば特開昭５８−
５１９号、実公平２−６１０６号あるいは特開平５−３
３９９４１号等が知られている。[0004] In addition, a means for expanding a reinforcing bar or a reinforcing material so as to be larger than the pile diameter in the hole bottom widening portion is also provided by rotating an existing pile or a rod or the like inserted in the hole in the hole. A method of enlarging a reinforcing bar or a reinforcing material provided at the lower end, for example, Japanese Patent Application Laid-Open No. Hei 6-287943, and a method of expanding a reinforcing bar or a reinforcing material by depressing a reinforcing bar cage, a preformed pile, a rod, or the like, for example, Japanese Patent Application Laid-Open No.
No. 519, Jitsuho 2-6106 or JP-A-5-3
No. 39941 is known.
【０００５】[0005]
【発明が解決すべき課題】上記の方式のうち、特開平６
−２８７９４３号のように既成杭を孔内で回転すること
で補強材の設けられた部分を拡大する方式は、具体的に
は、杭の下端に拡径可能な掘削刃部材を設け、杭を回転
しつ地盤中に圧入して所定の深さに達した時点で、杭を
逆転して杭下端の掘削刃部材を拡開することで杭孔の下
端に孔底拡開部を形成し、補強材としての掘削刃部材が
拡開した状態における前記孔底拡開部内にセメントミル
クを圧入して土砂と混合された拡径根固め部を形成する
ものである。SUMMARY OF THE INVENTION Among the above-mentioned systems,
The method of enlarging a portion provided with a reinforcing material by rotating an existing pile in a hole as in -287943 is, specifically, providing a drilling blade member capable of expanding the diameter at the lower end of the pile, and mounting the pile. At the time when it reaches the predetermined depth by press-fitting into the rotating ground, the pile is reversed and the excavation blade member at the bottom of the pile is expanded to form a hole bottom expanding part at the lower end of the pile hole, Cement milk is press-fitted into the hole bottom widening portion in a state where the drilling blade member as a reinforcing material is widened to form a widened root consolidation portion mixed with earth and sand.
【０００６】しかしながら、この方式では、杭下端の掘
削刃部材により孔底拡開部を掘削したのちに、この掘削
刃部材の拡開した孔底拡開部内にセメントミルクを圧入
して拡径根固め部を形成するので、一見、合理的にみえ
るが、最終的に杭孔の下端に孔底拡開部を掘削するため
の掘削刃部材を地上に回収することなく、孔底拡開部の
補強材に置き換えて埋め殺してしまうため、本来は鉄筋
のような価格の安いもので足る補強材として、わざわざ
地盤を掘削するための機能をもつ高価な掘削刃装置を使
用しなければならず、しかも使用する全ての杭の下端に
夫々高価な掘削刃部材を設けなければならないので、工
事全体として費用がきわめけ高額になるという問題点を
有している。However, in this method, after excavating the hole bottom enlarged portion by the excavation blade member at the lower end of the pile, cement milk is press-fitted into the enlarged hole bottom enlarged portion of the excavation blade member to enlarge the root. At first glance, it looks reasonable because it forms a hardened part, but without collecting the excavation blade member for excavating the hole bottom enlarged part at the lower end of the pile hole finally, the hole bottom enlarged part In order to replace and replace the reinforcing material, it is necessary to use an expensive excavating blade device that has the function of excavating the ground as a reinforcing material that is originally cheap enough like a reinforcing bar, In addition, since expensive excavating blade members must be provided at the lower ends of all the piles to be used, there is a problem that the cost of the entire construction is extremely high.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記のような
従来における拡底杭の問題点に鑑み、コンクリートパイ
ルのような既成杭の下端外周に専ら鉄筋としての機能を
もつ補強材を設けることで、支持力のある有効断面を備
えた経済性のある拡底部を形成することができる既成杭
による有鉄骨拡底杭の提供を目的としたものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional expanded pile, and provides a reinforcing material having a function as a reinforcing bar exclusively on the outer periphery of a lower end of an existing pile such as a concrete pile. It is an object of the present invention to provide a steel-framed expanded pile made of prefabricated piles capable of forming an economical expanded portion having an effective cross section with a supporting force.
【０００８】請求項１の発明はそのための具体的手段と
して、既成杭の下端部に間隔をおいて上下一対のバンド
を設け、前記バンド外周面の上下対称位置に夫々バンド
の長さ方向に沿って湾曲する複数個のアームを、杭の断
面方向からみて夫々一端がヒンジを介して他端が杭外側
方向へ回動するように開閉可能に軸着すると共に、夫々
上下の対応する前記アーム間に杭の長さ方向に沿った複
数本の縦筋を連結して杭外周面に複数組の拡開鉄筋を形
成し、これら拡開鉄筋の縦筋間に横筋を連結したことを
特徴とする。According to the first aspect of the present invention, a pair of upper and lower bands are provided at the lower end of the existing pile at an interval at the lower end of the existing pile, and each of the bands is arranged along the longitudinal direction of the band at a vertically symmetric position on the outer peripheral surface of the band. A plurality of arms that are curved and openable and closable such that one end is pivotally movable in the other direction toward the outside of the pile via a hinge when viewed from the cross-sectional direction of the pile, and between the corresponding upper and lower arms. A plurality of longitudinal bars along the length direction of the pile are connected to form a plurality of sets of expanded reinforcing bars on the outer peripheral surface of the pile, and horizontal bars are connected between the vertical bars of these expanded reinforcing bars. .
【０００９】請求項２の発明は、拡開鉄筋の縦筋間に設
けられる横筋として、夫々の拡開鉄筋が拡開した後に外
側の縦筋間に水平に張設される長さをもったチェーンを
備えていることを特徴とする。According to a second aspect of the present invention, the horizontal bars provided between the vertical bars of the expanded reinforcing bars have a length extending horizontally between the outer vertical bars after each expanded bar is expanded. It is characterized by having a chain.
【００１０】[0010]
【作用】本発明の拡底杭では、孔底に拡開部が掘削され
た杭孔の該拡開部内にセメントミルクを充填して土砂と
混合させた直後、この杭孔内に下端部に複数組の拡開鉄
筋を設けた既成杭を、夫々の拡開鉄筋が杭の外周面に密
着して閉じられている状態が維持されるような向きに回
転しながら杭底まで挿入し、前記拡開鉄筋が孔底拡開部
内に位置した時点で既成杭を逆回転する。With the expanded pile according to the present invention, immediately after the cement milk is filled into the expanded portion of the pile hole in which the expanded portion is excavated at the bottom of the hole and mixed with the earth and sand, a plurality of holes are formed at the lower end portion in the pile hole. Insert the existing pile provided with the set of expanded reinforcing bars to the pile bottom while rotating in such a direction that each expanded reinforcing bar is kept in close contact with the outer peripheral surface of the pile, and When the open rebar is located in the hole bottom widening, the existing pile is rotated in reverse.
【００１１】既成杭が逆回転されると、夫々の拡開鉄筋
の先端が孔底拡開部内におけるセメントミルク及び土砂
との混合物による抵抗を受けた状態で杭が回転するの
で、夫々の拡開鉄筋はヒンジ部を中心に杭の外側方向へ
所定の角度位置まで開き、杭の下端に杭の外径よりも大
きな拡開された鉄筋篭が形成される。When the existing piles are rotated in the reverse direction, the piles are rotated in a state where the tip of each expanded reinforcing bar receives the resistance due to the mixture of cement milk and earth and sand in the hole bottom expanded portion. The reinforcing bar is opened to the outside of the pile to a predetermined angular position around the hinge portion, and an expanded reinforcing cage larger than the outer diameter of the pile is formed at the lower end of the pile.
【００１２】[0012]
【実施例】次に本発明に係る拡底杭を図面に示す実施例
により説明すると、図１は拡開鉄筋６が開いた状態にお
ける既成杭３の下端部の構成を示す斜視図であり、既成
杭３の下端部には間隔をおいて上下一対の金属性バンド
４が設けられていて、これらバンド４の外周面における
上下対称位置に、夫々バンド４の長さ方向に沿って湾曲
する複数個のアーム７が、杭３の断面方向からみて夫々
一端がヒンジ５を介して他端が杭外側方向へ所定角度ま
で水平に回動するように軸着されている。FIG. 1 is a perspective view showing the configuration of the lower end portion of an existing pile 3 in a state where an expanded reinforcing bar 6 is opened. A pair of upper and lower metal bands 4 are provided at the lower end of the pile 3 at intervals, and a plurality of metal bands 4 are respectively bent along the length direction of the band 4 at vertically symmetrical positions on the outer peripheral surface of these bands 4. The arm 7 is pivotally mounted at one end via a hinge 5 so that the other end of the arm 7 horizontally turns to a predetermined angle in the outer direction of the pile 3 when viewed from the cross-sectional direction of the pile 3.
【００１３】前記バンド４の上下対称位置に軸着される
夫々の対応する上下一対のアーム７，７間には、夫々杭
３の長さ方向に沿った複数本の縦筋８が、アーム７の先
端部と中間部とに間隔を置いて平行に連結されており、
杭３の下端部外周面にこれらの対応する上下一対のアー
ム７，７と縦筋８とをもって一個とする複数組の前記拡
開鉄筋６が夫々開閉可能なるように設けられている。Between the corresponding pair of upper and lower arms 7, 7 which are pivotally mounted at the vertically symmetric positions of the band 4, a plurality of vertical streaks 8 along the length direction of the pile 3 are provided. Are connected in parallel with a gap between the tip and the middle of the
On the outer peripheral surface of the lower end portion of the pile 3, a plurality of sets of the above-described expanded reinforcing bars 6, each of which has a pair of upper and lower arms 7, 7 and a vertical bar 8, are provided so as to be openable and closable.
【００１４】前記拡開鉄筋６はそのアーム７が、杭３の
断面方向からみて、バンド４の周長のほぼ３乃至８分の
１に相当するような長さ（本実施例では、図３のように
６分の１）からなっていて、杭３を杭孔１内に挿入する
時には、図２及び図３のように、各拡開鉄筋６をヒンジ
５の右側へ回転することで、互いに杭３の外周面へ密着
閉合させた状態で、杭３を時計針方向に回転しながら杭
孔１内へ挿入する。The expanded reinforcing bar 6 has a length such that the arm 7 thereof corresponds to approximately one third to one eighth of the circumferential length of the band 4 when viewed from the cross-sectional direction of the pile 3 (in this embodiment, FIG. When the stake 3 is inserted into the stake hole 1 as shown in FIGS. 2 and 3, by rotating each of the expanded reinforcing bars 6 to the right side of the hinge 5 as shown in FIGS. The pile 3 is inserted into the pile hole 1 while rotating in the clockwise direction in a state where the pile 3 is tightly closed to the outer peripheral surface of the pile 3.
【００１５】また、拡開鉄筋６の前記縦筋８としては、
丸棒異形鉄筋、平鋼、Ｌ形鋼などが使用される。The longitudinal bars 8 of the expanded reinforcing bars 6 include:
Round bar deformed bars, flat steel, L-shaped steel, etc. are used.
【００１６】また、前記縦筋８のうち、アーム７の先端
部に位置する縦筋８には、複数数段にわたって用心鉄筋
として横筋９が設けられている。これらの横筋９として
は、図１，図２及び図４に示すように、夫々両側が拡開
鉄筋６における外側縦筋８間に連結されたチェーンから
なっていて、全体の長さとしては、図１及び図４のよう
に、拡開鉄筋６が拡開した時に夫々の外側縦筋８間に水
平に張設されて、杭３の外径よりも大きい環状体を形成
するような長さをもっており、従って、拡開鉄筋６が拡
開される前は、図２のように夫々の外側縦筋８間におい
て下方へ弛んだ状態となっている。In the vertical streaks 8, the vertical streaks 8 located at the distal end of the arm 7 are provided with horizontal streaks 9 as guard iron bars over a plurality of stages. As shown in FIGS. 1, 2 and 4, these transverse streaks 9 are formed of chains connected on both sides between the outer longitudinal streaks 8 of the expanded reinforcing bar 6. As shown in FIGS. 1 and 4, when the expanded reinforcing bars 6 are expanded, they are stretched horizontally between the respective outer vertical bars 8 to form an annular body larger than the outer diameter of the pile 3. Therefore, before the expanded rebar 6 is expanded, it is in a state of being slackened downward between the respective outer vertical bars 8 as shown in FIG.
【００１７】杭３が挿入される前記杭孔１は、図５のよ
うに、予め杭３の挿入前に所定の深さまで掘削されてい
ると共に、下端に孔底拡開部２が設けられており、前記
拡開鉄筋６を設けた杭３が杭孔１内に挿入される直前に
孔底拡開部２内にセメントミルクが投入され、杭３が杭
孔１内に挿入されて各拡開鉄筋６が孔底拡開部２内に位
置した時点で杭３を挿入時とは逆の方向に回転させる。As shown in FIG. 5, the pile hole 1 into which the pile 3 is inserted is excavated to a predetermined depth before the pile 3 is inserted, and a hole bottom expanding portion 2 is provided at the lower end. Just before the pile 3 provided with the expanded reinforcing bars 6 is inserted into the pile hole 1, cement milk is poured into the hole bottom expanded portion 2, and the pile 3 is inserted into the pile hole 1 and expanded. When the open reinforcing bar 6 is located in the hole bottom enlarged portion 2, the pile 3 is rotated in the direction opposite to the direction at the time of insertion.
【００１８】杭３が逆回転されると、夫々の拡開鉄筋６
は、先端が孔底拡開部２内におけるセメントミルク及び
土砂との混合物１０による抵抗を受けることで、ヒンジ
５を中心に杭の外側方向へ所定の角度位置まで開くよう
に回動し、図１，図４及び図５のように杭３の下端に杭
径よりも大きく拡開した鉄筋篭が形成される。When the pile 3 is rotated in the reverse direction, each of the expanded reinforcing bars 6
When the tip is subjected to resistance by the mixture 10 with the cement milk and the earth and sand in the hole bottom expanding portion 2, the tip pivots around the hinge 5 so as to open to the outside of the pile to a predetermined angular position, As shown in FIG. 1, FIG. 4 and FIG. 5, at the lower end of the pile 3, a reinforced cage that is larger than the pile diameter is formed.
【００１９】前記の実施例では、拡開鉄筋６における外
側縦筋８に設ける横筋９としてチェーンを使用したが、
この横筋９としては必ずしもチェーンに限られることは
なく、ワイヤのようなものであってもよい。In the above embodiment, a chain is used as the horizontal bar 9 provided on the outer vertical bar 8 of the expanded reinforcing bar 6,
The horizontal stripe 9 is not necessarily limited to a chain, but may be a wire.
【００２０】また、前記の実施例では、杭３を挿入する
ための杭孔１として、予め杭３の挿入前に所定の深さま
で掘削して、下端に孔底拡開部２を設けた先堀り工法に
よるものとして説明したが、この杭孔１は必ずしも先堀
り工法によるものに限られることはなく、杭３の内側に
下端に孔底拡開用の掘削刃を設けたスクリュウコンベア
を挿入して、掘削刃の回転により所定の深さまで杭孔を
掘削しつつ杭３を埋め込んで、下端に孔底拡開部２を設
けたのち、前記掘削刃を地上に引き上げてから孔底拡開
部２内に拡開鉄筋６により補強されたコンクリート拡底
部を形成する中掘り工法によるもの、あるいは、杭孔と
して予め地上から孔底拡開部２と同じ内径の孔を掘削し
て、杭を挿入した後で前記のような拡開鉄筋６によるコ
ンクリート拡底部を設け、しかる後にコンクリート拡底
部の上部における杭の外周面に土砂を埋め戻すような工
法によるものであってもよい。In the above embodiment, the pile hole 1 for inserting the pile 3 is excavated to a predetermined depth before the pile 3 is inserted, and the hole bottom enlarged portion 2 is provided at the lower end. Although the explanation has been given assuming that the excavation method is used, the pile hole 1 is not necessarily limited to the excavation method, and a screw conveyor provided with a digging blade for expanding the hole bottom at the lower end inside the pile 3 is used. The drill 3 is inserted, the pile 3 is buried while excavating the pile hole to a predetermined depth by the rotation of the drilling blade, the hole bottom expanding portion 2 is provided at the lower end, and then the drilling blade is raised to the ground, and then the hole bottom expanding. The inside of the opening 2 is formed by the inside digging method of forming a concrete bottom portion reinforced by the widening reinforcing bar 6, or a hole having the same inner diameter as the hole bottom widening portion 2 is previously excavated from the ground as a pile hole. After inserting the concrete, the concrete expanded bottom part by the expanded reinforcing bar 6 as described above Provided may be by method such as backfill earth and sand on the outer peripheral surface of the pile at the top of the concrete 拡底 portion thereafter.
【００２１】[0021]
【発明の効果】以上に述べたように、本発明の有鉄骨拡
底杭では、既成杭３の下端部に設けられる拡開鉄筋６
を、杭体外径の３〜８分の１の長さをもち、かつ杭体外
周面に密着して閉じられる湾曲状の上下アーム７と、こ
れらのアーム間を連結する縦筋８とにより形成したの
で、これらの拡開鉄筋６を孔底拡開部２内で拡開させる
ことにより、杭体下端に杭径の約１．７〜１．９倍の外
径をもった拡開鉄筋を設けることができ、単に杭体下端
の拡底部の拡大比率を向上させるだけでなく、セメント
ミルクによる拡底部を拡開鉄筋６による有筋部で補強で
きることにより、従来のこの種の工法によるものと比較
してはるかに強力な支持力のある杭体とすることができ
る。As described above, according to the present invention, the expanded steel reinforcing bar 6 is provided at the lower end of the existing pile 3.
Are formed by curved upper and lower arms 7 having a length of 1/3 to 1/8 of the outer diameter of the pile and being closed in close contact with the outer peripheral surface of the pile, and vertical streaks 8 connecting these arms. Therefore, by expanding these expanded reinforcing bars 6 in the hole bottom expanding portion 2, an expanded reinforcing bar having an outer diameter of about 1.7 to 1.9 times the pile diameter at the lower end of the pile body. It can be provided not only by simply increasing the enlargement ratio of the bottom of the pile body at the bottom, but also by reinforcing the bottom with cement milk with the reinforced portions of the expanded reinforcing bar 6, which is different from the conventional method of this kind. Pile bodies with much stronger bearing capacity can be obtained.
【００２２】従来工法による杭と本発明による杭との支
持力を比較した実験によると、杭径３００ｍｍのコンク
リート杭で、従来工法の杭では支持力２９トン、実物載
荷試験９３トンであるのに対し、本発明の杭では支持力
１０５トン、実物載荷試験３８５トンを得た。また、杭
径４５０ｍｍのコンクリート杭では、従来工法の杭で支
持力６６トン、実物載荷試験２１１トンであるのに対
し、本発明の杭では支持力１９３トン、実物載荷試験７
０８トンであった。更に、杭径６００ｍｍのコンクリー
ト杭では、従来工法の杭で支持力１１７トン、実物載荷
試験３７４トンであるのに対し、本発明の杭では支持力
３３５トン、実物載荷試験１２２９トンであった。According to an experiment comparing the bearing capacity between the pile according to the conventional method and the pile according to the present invention, a concrete pile having a pile diameter of 300 mm has a bearing capacity of 29 tons and a loading capacity test of 93 tons in the conventional pile. On the other hand, with the pile of the present invention, a supporting force of 105 tons and a real load test of 385 tons were obtained. In the case of a concrete pile having a pile diameter of 450 mm, the conventional pile had a supporting force of 66 tons and an actual load test of 211 tons, while the pile of the present invention had a support force of 193 tons and an actual load test of 7 tons.
08 tons. Further, in the case of a concrete pile having a pile diameter of 600 mm, the pile of the conventional construction method had a supporting force of 117 tons and a real load test of 374 tons, whereas the pile of the present invention had a support force of 335 tons and a real load test of 1229 tons.
【００２３】また、本発明の拡開鉄筋は既成杭の下端に
上下一対のバンドを取り付けることで現場で簡単に装着
することができ、構造自体も簡単であるのでコストも低
廉で経済的であるという利点を有すると共に、有筋のコ
ンクリート拡底部により引き抜き力も増大するという利
点を有する。Further, the expanded reinforcing bar of the present invention can be easily installed on site by attaching a pair of upper and lower bands to the lower end of the existing pile, and the structure itself is simple, so that the cost is low and economical. In addition to this, there is an advantage that the pulling force is also increased by the reinforced concrete bottom portion.
【図１】本発明に係る有鉄骨拡底杭の拡開鉄筋が開いた
状態を示す斜視図。FIG. 1 is a perspective view showing a state in which an expanded reinforcing bar of a steel-framed expanded pile according to the present invention is opened.
【図２】図１の拡開鉄筋が開く前の状態を示す斜視図。FIG. 2 is a perspective view showing a state before the expanded reinforcing bar of FIG. 1 is opened.
【図３】図２の拡開鉄筋が開く前の状態を示す平面図。FIG. 3 is a plan view showing a state before the expanded reinforcing bar of FIG. 2 is opened.
【図４】図１の拡開鉄筋が開いた状態を示す平面図。FIG. 4 is a plan view showing a state where the expanded rebar of FIG. 1 is opened.
【図５】本発明に係る有鉄骨拡底杭の築造後の状態を示
す断面図。FIG. 5 is a cross-sectional view showing a state after the construction of the steel-frame expanded bottom pile according to the present invention.
１：杭孔 ２：孔底拡開部 ３：既成杭 ４：バンド ５：ヒンジ ６：拡開鉄筋 ７：アーム ８：縦筋 ９：横筋 1: Pile hole 2: Hole bottom expanded part 3: Preformed pile 4: Band 5: Hinge 6: Expanded reinforcing bar 7: Arm 8: Vertical bar 9: Horizontal bar
Claims (2)
のバンドを設け、前記バンド外周面の上下対称位置に夫
々バンドの長さ方向に沿って湾曲する複数個のアーム
を、杭の断面方向からみて夫々一端がヒンジを介して他
端が杭外側方向へ回動するように開閉可能に軸着すると
共に、夫々上下の対応する前記アーム間に杭の長さ方向
に沿った複数本の縦筋を連結して杭外周面に複数組の拡
開鉄筋を形成し、これら拡開鉄筋の縦筋間に横筋を連結
したことを特徴とする既成杭による有鉄骨拡底杭。1. A pair of upper and lower bands are provided at the lower end of a prefabricated pile at an interval, and a plurality of arms, each of which is curved along the longitudinal direction of the band at a vertically symmetric position on the outer peripheral surface of the band, are provided. When viewed from the cross-sectional direction, each one end is hinged so as to be openable and closable such that the other end is pivotally moved to the outside of the pile via the hinge, and a plurality of pieces are arranged along the length direction of the pile between the corresponding upper and lower arms. A plurality of expanded reinforcing bars are formed on the outer peripheral surface of the pile by connecting the vertical reinforcing bars, and horizontal bars are connected between the vertical reinforcing bars of the expanded reinforcing bars.
て、夫々の拡開鉄筋が拡開した後に外側の縦筋間に水平
に張設される長さをもったチェーンを備えている請求項
１の既成杭による有鉄骨拡底杭。2. A horizontal bar provided between the longitudinal bars of the expanded reinforcing bars, and a chain having a length extending horizontally between the outer vertical bars after each expanded reinforcing bar is provided. A steel-framed expanded pile according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9240265A JP3054389B2 (en) | 1997-08-22 | 1997-08-22 | Prefabricated steel pile with prefabricated pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9240265A JP3054389B2 (en) | 1997-08-22 | 1997-08-22 | Prefabricated steel pile with prefabricated pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1161811A JPH1161811A (en) | 1999-03-05 |
| JP3054389B2 true JP3054389B2 (en) | 2000-06-19 |
Family
ID=17056930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9240265A Expired - Fee Related JP3054389B2 (en) | 1997-08-22 | 1997-08-22 | Prefabricated steel pile with prefabricated pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3054389B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7027122B2 (en) | 2002-03-12 | 2006-04-11 | Lg.Philips Lcd Co., Ltd. | Bonding apparatus having compensating system for liquid crystal display device and method for manufacturing the same |
| KR101506163B1 (en) * | 2014-04-22 | 2015-03-26 | 한국기초(주) | the improved cast injected concrete pile structure using automatic expanded rebar and quick-gelled injection and the reinforced steel withdrawal method using the same |
| CN112281818B (en) * | 2020-10-12 | 2021-11-05 | 广东一新长城建筑集团有限公司 | Novel building concrete pipe pile based on anti-permeation technology and preparation method thereof |
-
1997
- 1997-08-22 JP JP9240265A patent/JP3054389B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1161811A (en) | 1999-03-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3828153B2 (en) | Underground structure for constructing tunnels, underground passages, underground parking lots, etc., construction method thereof, and prefabricated member for the structure | |
| JP3054389B2 (en) | Prefabricated steel pile with prefabricated pile | |
| JPH02289718A (en) | Drilling method of expanded head pile hole, constructing method of expanded head pile and pile hole drill | |
| JP3883372B2 (en) | Construction steel pipe member and construction method of construction steel pipe member | |
| JP3470576B2 (en) | Construction method of retaining wall and retaining wall structure | |
| JP3586839B2 (en) | In-situ formed concrete pile and its forming method | |
| JP2997207B2 (en) | Prefabricated steel pile with prefabricated pile | |
| JPH11286933A (en) | Steel expansion pile by existing pile | |
| JPH05339936A (en) | Column strip type underground continuous wall process | |
| JPS6250516A (en) | Formation work of composite pile | |
| JP3135495B2 (en) | Construction method of avalanche and rock fall protection fence and avalanche and rock fall protection fence | |
| JPH04309692A (en) | Underground space construction method | |
| JPH057520B2 (en) | ||
| JP2005200865A (en) | Work execution method for foundation pile | |
| JPH0960471A (en) | Wall body for shield tunneling method | |
| JP3113982B2 (en) | Tunnel construction method on soft ground | |
| KR20040083138A (en) | Bell process and structure for arrangement of bar in a bell part thereof | |
| JPH026106Y2 (en) | ||
| JP2688405B2 (en) | Concrete gutter | |
| JPS6351209B2 (en) | ||
| JP2663085B2 (en) | Construction method of spiral underground structure | |
| JP2795056B2 (en) | Supporting method for existing structures | |
| JP2005180019A (en) | Foundation pile construction method | |
| JP2814930B2 (en) | Soil liquefaction prevention method | |
| KR200318814Y1 (en) | Structure for arrangement of bar in a bell part of bell process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |