JP2011106240A - Pile head joint structure - Google Patents

Pile head joint structure Download PDF

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JP2011106240A
JP2011106240A JP2009265711A JP2009265711A JP2011106240A JP 2011106240 A JP2011106240 A JP 2011106240A JP 2009265711 A JP2009265711 A JP 2009265711A JP 2009265711 A JP2009265711 A JP 2009265711A JP 2011106240 A JP2011106240 A JP 2011106240A
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pile head
outer peripheral
peripheral surface
stud bolt
pile
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JP5420376B2 (en
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Harukatsu Kadoya
治克 角屋
Nobuhiro Araki
信博 荒木
Yoshiteru Maruyama
喜照 丸山
Keiko Shinkai
景子 新開
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Okabe Co Ltd
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Okabe Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pile head joint structure which enables an anchor reinforcement to be connected to the outer peripheral surface of the pile head with high joint performance by preventing the backlash and partial contact of a stud bolt, on the condition that the stud bolt is joined to the outer peripheral surface of the pile head, and which can be applied to various pile diameters with high versatility. <P>SOLUTION: In this pile head joint structure, the stud bolt 2, which is joined to a steel pipe forming the outer peripheral surface 1a of the pile head of a pile, in such a manner as to be directed sideways outward from the steel pile, is inserted through a connecting fitting 4 which comprises an insertion hole 5 allowing the penetration of the stud bolt and a female screw hole 6 connected to the end of the anchor reinforcement 3; and a nut 10 is screwed to the stud bolt passing through the connecting fitting, so that the anchor reinforcement can be connected to the pile head while the connecting fitting abuts on the outer peripheral surface of the pile head. An insertion portion is formed as a loose hole for the stud bolt; and a surface 4a of the connecting fitting, which faces the outer peripheral surface of the pile head, is formed of a flat surface. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、鋼管コンクリート杭や鋼管杭の杭頭部にアンカー鉄筋(杭頭鉄筋)を接合する杭頭接合構造に関する。より詳しくは、杭頭部外周面に接合したスタッドボルトとアンカー鉄筋とを、接続金物を介して接続するにあたり、これら接続金物とスタッドボルトをがたつきなく接続して、杭頭部の接合性能を向上する杭頭接合構造に関する。   The present invention relates to a pile head joint structure for joining an anchor reinforcement (pile head reinforcement) to a pile head of a steel pipe concrete pile or a steel pipe pile. More specifically, when connecting the stud bolts and anchor reinforcing bars joined to the outer peripheral surface of the pile head via the connection hardware, these connection hardware and stud bolts are connected without rattling, and the pile head joint performance The present invention relates to a pile head joint structure that improves the performance.

近年、需要が増えつつある高強度の杭において、その杭と基礎コンクリートやフーチングなどの基礎躯体とを剛接合する場合には、一般的な杭頭部の仕様よりも、曲げ耐力などの接合性能を高める必要がある。   In recent years, in high-strength piles for which demand has been increasing, when rigidly joining the pile to a foundation frame such as foundation concrete or footing, the joint performance such as bending strength is better than the specification of the general pile head. Need to be increased.

その際、杭頭部に生じる応力に抵抗できるだけのアンカー鉄筋を杭頭部の端板に設置することになるが、アンカー鉄筋の本数を増やすことは、フーチングなどの配筋に問題があり、太径のアンカー鉄筋を用いたとしても、アンカー鉄筋間に所定の間隔を設ける必要があるため、設置本数に限界があり、杭頭部の端板に接合することは難しい。また、鉄筋径を変えずに高強度材のアンカー鉄筋を端板に接合することは、当該端板への接合条件や定着長さの確保などの点で問題がある。   At that time, anchor reinforcing bars that can resist the stress generated in the pile head will be installed on the end plate of the pile head. However, increasing the number of anchor reinforcing bars has a problem with bar arrangements such as footing. Even if anchor rebars with a diameter are used, it is necessary to provide a predetermined interval between the anchor rebars, so the number of installations is limited, and it is difficult to join the pile head end plates. In addition, there is a problem in joining anchor bars of high strength material to the end plates without changing the diameter of the reinforcing bars in terms of joining conditions to the end plates and securing the fixing length.

そこで、端板ではなく、杭頭部外周面にアンカー鉄筋を設置して本数の増大を図ったり、杭頭部外周面から離れた位置にアンカー鉄筋を配置することによって、杭頭部に作用する曲げモーメントに伴う引張力を小さくし、これにより、アンカー鉄筋を太径化したり、高強度化することなく、接合性能を増大するようにした技術が特許文献1〜3に示されている。   Therefore, instead of the end plate, the anchor rebar is installed on the outer periphery of the pile head to increase the number, or by placing the anchor rebar away from the outer surface of the pile head, it acts on the pile head Patent Documents 1 to 3 disclose techniques that increase the joining performance without reducing the tensile force associated with the bending moment, thereby increasing the diameter of the anchor reinforcing bar or increasing the strength.

特許文献1及び2では、杭頭外周面に直接、折り曲げたアンカー鉄筋の端部を接合している。特許文献3では、杭頭外周面にカプラーや接続金具を溶着し、これらカプラー等にアンカー鉄筋を接合している。   In patent document 1 and 2, the edge part of the bent anchor reinforcement is joined directly to the pile head outer peripheral surface. In patent document 3, a coupler and a connection metal fitting are welded to a pile head outer peripheral surface, and an anchor reinforcing bar is joined to these couplers.

特開平9−71949号公報JP-A-9-71949 特開2004−308359号公報JP 2004-308359 A 特開2002−115248号公報JP 2002-115248 A

特許文献1及び2では、アンカー鉄筋を予め折り曲げているため、杭頭外周面に接合することが非常に難しく、さらに、折り曲げ部分が杭頭部の接合性能に悪影響を与えてしまう。詳細には、折り曲げにより張り出した部分に曲げが作用すると、鉛直部分に十分に力を伝達することができないため、張り出し部分の曲げ剛性が低く、期待される性能を十分に発揮することができない。   In Patent Documents 1 and 2, since the anchor rebar is bent in advance, it is very difficult to join the outer periphery of the pile head, and the bent portion adversely affects the joining performance of the pile head. More specifically, if bending acts on a portion that has been bulged by bending, the force cannot be sufficiently transmitted to the vertical portion, so that the bending rigidity of the bulged portion is low and the expected performance cannot be fully exhibited.

特許文献3では、現場にて縦向きの溶接を行う必要があり、手間がかかると共に、熟練工を要する。また、カプラーや接続金具を長さ方向全長に亘って溶接する必要があり、溶接量が多い。さらに、溶接作業スペースを確保しなければならない関係上、隣り合うカプラー等の間隔を広く空けなければならず、結局アンカー鉄筋の設置本数が制約される。   In Patent Document 3, it is necessary to perform vertical welding at the site, which is troublesome and requires a skilled worker. Further, it is necessary to weld the coupler and the connection fitting over the entire length in the length direction, and the welding amount is large. Furthermore, because the welding work space must be ensured, it is necessary to widen the interval between adjacent couplers and the like, which ultimately limits the number of anchor reinforcing bars.

またこれら特許文献1〜3いずれにあっても、アンカー鉄筋に生じる力が杭に伝達される際、直接、溶接部分に力が作用するため、溶接については十分な施工管理が必要となる。しかも、現場溶接作業となるため、ブローホールなどの溶接不良が発生するおそれが常にあり、溶接性能(耐力)の信頼性が懸念される。   Moreover, even if it exists in any of these patent documents 1-3, since force acts on a welding part directly when the force which arises in an anchor reinforcement is transmitted to a pile, sufficient construction management is needed about welding. In addition, since it is an on-site welding operation, there is always a possibility that welding defects such as blow holes may occur, and there is a concern about the reliability of the welding performance (proof strength).

そこで、接合対象の杭が既成コンクリート杭ではあるものの、上記問題点を解決し得る技術として、特許文献2に開示されている構造が知られており、この構造を鋼管杭等に適用することが考えられる。当該構造は、杭頭部外周面に溶接接合したスタッドボルトを挿通する挿通孔及びアンカー鉄筋を螺入する雌ねじ孔を形成した接続金具を介して、杭頭部にアンカー鉄筋を接続するものである。   Therefore, although the pile to be joined is a prefabricated concrete pile, the structure disclosed in Patent Document 2 is known as a technique that can solve the above problems, and this structure can be applied to a steel pipe pile or the like. Conceivable. The said structure connects an anchor reinforcement to a pile head via the fitting which formed the penetration hole which penetrates the stud bolt weld-joined to the pile head outer peripheral surface, and the female screw hole which inserts an anchor reinforcement. .

しかし、杭頭部外周面へのスタッドボルトの溶接接合は、高い施工精度・位置精度を確保することが難しく、このためスタッドボルト用の挿通孔を、当該スタッドボルトの外径よりも大径にする必要がある。アンカー鉄筋1本当たりに使用するスタッドボルト本数を増やすと、融通を利かせるために、挿通孔の孔径をさらに大径にする必要がある。また、接続金具は、杭頭部外周面に当接する面が当該外周面輪郭に合わせた弧状に形成されている。以上の点を検討すると、挿通孔の大径化による接続金具とスタッドボルトとのがたつき、そしてそれに伴う接合性能(固定度合い)の低下や、大径の挿通孔内部でスタッドボルトが片当たりすることによるせん断耐力の低下、接続金具の弧状部を杭頭部外周面に合わせる必要から、杭毎に接続金具を作製・用意する必要があり、接続金具の仕様が膨大になるといった課題があった。   However, it is difficult to secure high construction accuracy and position accuracy when welding the stud bolt to the outer surface of the pile head, so the insertion hole for the stud bolt is made larger than the outer diameter of the stud bolt. There is a need to. If the number of stud bolts used per anchor reinforcing bar is increased, it is necessary to further increase the diameter of the insertion hole in order to make the use more flexible. Moreover, the connection metal fitting is formed in the arc shape which contact | abutted the pile head outer peripheral surface according to the said outer peripheral surface outline. Considering the above points, rattling between the connection fitting and stud bolt due to the large diameter of the insertion hole, and the accompanying deterioration in the joining performance (fixed degree), and the stud bolt per side inside the large diameter insertion hole As a result, the shear strength is reduced and the arcuate part of the connection fitting must be matched to the outer periphery of the pile head. It was.

本発明は上記従来の課題に鑑みて創案されたものであって、杭頭部外周面にスタッドボルトを接合することを前提として、スタッドボルトのがたつきや片当たりを防止して杭頭部外周面に対し高い接合性能でアンカー鉄筋を接続することが可能であり、また種々の杭径に対して汎用性高く適用し得る杭頭接合構造を提供することを目的とする。   The present invention was devised in view of the above-described conventional problems, and on the premise that the stud bolt is joined to the outer peripheral surface of the pile head, the pile head is prevented from rattling and per contact of the stud bolt. An object of the present invention is to provide a pile head joint structure that can connect anchor reinforcing bars to the outer peripheral surface with high joint performance and can be applied to various pile diameters with high versatility.

本発明にかかる杭頭接合構造は、杭の杭頭部外周面を形成する鋼管にこれより外方へ向かって横向きに接合したスタッドボルトに、該スタッドボルトが貫通する挿通部及びアンカー鉄筋の端部が接続される接続部を有する接続金物を挿通し、該接続金物を貫通させた該スタッドボルトにナットを螺着することで、該接続金物を該杭頭部外周面に当接させつつ、該アンカー鉄筋を該杭頭部に接続するようにした杭頭接合構造であって、上記挿通部は上記スタッドボルトに対してルーズホールで形成されるとともに、上記杭頭部外周面に面する上記接続金物表面が平坦面で形成されることを特徴とする。   The pile head joint structure according to the present invention includes a stud bolt joined laterally outwardly to a steel pipe forming a pile head outer peripheral surface of the pile, an insertion portion through which the stud bolt penetrates, and an end of an anchor reinforcing bar. Inserting a connection hardware having a connection portion to which the portion is connected, and screwing a nut to the stud bolt penetrating the connection hardware, the contact hardware is brought into contact with the outer peripheral surface of the pile head, A pile head joint structure in which the anchor reinforcing bars are connected to the pile head, wherein the insertion portion is formed as a loose hole with respect to the stud bolt and faces the outer peripheral surface of the pile head. The connecting metal surface is formed as a flat surface.

前記杭頭部外周面に面する前記接続金物表面には、内面が該杭頭部外周面との間に隙間を空けた状態で一対の開口縁部が当該杭頭部外周面と当接するとともに前記挿通部と連通される溝が、上下方向縦向きに形成されることを特徴とする。   On the surface of the connection hardware facing the outer peripheral surface of the pile head, a pair of opening edges abut against the outer peripheral surface of the pile head with an inner surface having a gap between the outer peripheral surface of the pile head and The groove communicated with the insertion portion is formed vertically in the vertical direction.

前記接続金物は、上向きのU字状片と、該U字状片の端部同士を連結する連結片とからなり、前記挿通部が上記U字状片で形成されると共に、前記接続部が上記連結片で構成されることを特徴とする。   The connection hardware consists of an upward U-shaped piece and a connecting piece that connects ends of the U-shaped piece, the insertion part is formed of the U-shaped piece, and the connection part is It is comprised with the said connection piece, It is characterized by the above-mentioned.

前記U字状片の底部には、内面が前記杭頭部外周面との間に隙間を空けた状態で一対の開口縁部が当該杭頭部外周面と当接する切り欠きが形成されることを特徴とする。   At the bottom of the U-shaped piece, a notch is formed in which a pair of opening edges contact the outer peripheral surface of the pile head in a state where a gap is formed between the inner surface and the outer peripheral surface of the pile head. It is characterized by.

本発明にかかる杭頭接合構造にあっては、杭頭部外周面にスタッドボルトを接合することを前提として、スタッドボルトのがたつきや片当たりを防止して杭頭部外周面に対し高い接合性能でアンカー鉄筋を接続することができると共に、種々の杭径に対して汎用性高く適用することができる。   In the pile head joint structure according to the present invention, on the premise that the stud bolt is joined to the outer surface of the pile head, the rattle of the stud bolt is prevented from rattling and per contact and is higher than the outer surface of the pile head. The anchor rebar can be connected with the joining performance and can be applied to various pile diameters with high versatility.

本発明に係る杭頭接合構造の第1実施形態を示す杭頭部の一部破断側面図である。It is a partially broken side view of a pile head which shows a 1st embodiment of a pile head junction structure concerning the present invention. 本発明に係る杭頭接合構造の第1実施形態を示す一部断面分解図である。It is a partial section exploded view showing a 1st embodiment of pile head junction structure concerning the present invention. 図1中、A部拡大図である。In FIG. 1, it is an A section enlarged view. 第1実施形態に適用される接続金物の正面図である。It is a front view of the connection hardware applied to a 1st embodiment. 図4に示した接続金物の平面図である。It is a top view of the connection metal fitting shown in FIG. 第1実施形態の変形例に適用される接続金物の平面図である。It is a top view of the connection hardware applied to the modification of a 1st embodiment. 第1実施形態の他の変形例を示す側面図である。It is a side view which shows the other modification of 1st Embodiment. 本発明に係る杭頭接合構造の第2実施形態を示す側面図である。It is a side view which shows 2nd Embodiment of the pile head junction structure which concerns on this invention. 第2実施形態に適用される接続金物の正面図である。It is a front view of the connection hardware applied to a 2nd embodiment. 図9に示した接続金物の平面図である。FIG. 10 is a plan view of the connection hardware shown in FIG. 9. 第2実施形態の第1変形例に適用される接続金物の正面図である。It is a front view of the connection hardware applied to the 1st modification of a 2nd embodiment. 図11に示した接続金物の平面図である。It is a top view of the connection metal fitting shown in FIG. 第2実施形態の第2変形例に適用される接続金物の正面図である。It is a front view of the connection hardware applied to the 2nd modification of 2nd Embodiment. 図13に示した接続金物の平面図である。It is a top view of the connection metal fitting shown in FIG. 第2実施形態の第3変形例に適用される接続金物の正面図である。It is a front view of the connection hardware applied to the 3rd modification of a 2nd embodiment. 図15に示した接続金物の平面図である。It is a top view of the connection metal fitting shown in FIG. 第2実施形態の第4変形例に適用される接続金物の正面図である。It is a front view of the connection hardware applied to the 4th modification of a 2nd embodiment. 図17中、B−B線矢視断面図である。FIG. 18 is a cross-sectional view taken along line BB in FIG.

以下に、本発明にかかる杭頭接合構造の好適な実施形態を、添付図面を参照して詳細に説明する。図1から図5には、第1実施形態に係る杭頭接合構造が示されている。鋼管杭や図1に示した鋼管コンクリート杭1は、杭頭部を含め、外周面が鋼管で形成されている。   EMBODIMENT OF THE INVENTION Below, the suitable embodiment of the pile head junction structure concerning this invention is described in detail with reference to an accompanying drawing. 1 to 5 show a pile head joint structure according to the first embodiment. The steel pipe pile and the steel pipe concrete pile 1 shown in FIG. 1 are formed of steel pipes on the outer peripheral surface including the pile head.

杭頭部外周面1aには、その周方向に沿って互いに間隔を隔てて、スタッドボルト2が溶接接合される。スタッドボルト2は、杭頭部外周面1aにこれより杭1の径方向外方へ向かって、水平方向横向きに接合される。図示例にあっては、スタッドボルト2は、一本のアンカー鉄筋3に対し、一つ配設されている。   A stud bolt 2 is welded and joined to the pile head outer peripheral surface 1a at intervals along the circumferential direction. The stud bolt 2 is joined to the pile head outer peripheral surface 1a laterally outward from the pile 1 in the radial direction. In the illustrated example, one stud bolt 2 is provided for one anchor reinforcing bar 3.

接続金物4は、直方体ブロック状の鋼製部品である。接続金物4には、左右方向横向きに挿通孔5が形成されると共に、上下方向縦向きに雌ネジ孔6が形成される。雌ネジ孔6には、アンカー鉄筋3の端部が螺入され、これにより接続金物4にアンカー鉄筋3が接続される。   The connection hardware 4 is a rectangular parallelepiped block-shaped steel part. The connection hardware 4 is formed with an insertion hole 5 in the horizontal direction and a female screw hole 6 in the vertical direction. The end of the anchor rebar 3 is screwed into the female screw hole 6, and the anchor rebar 3 is connected to the connection hardware 4.

挿通孔5には、スタッドボルト2が貫通状態で挿通される。挿通孔5は、緩やかに融通を利かせてスタッドボルト2を貫通させ得るように、ルーズホールで形成される。ルーズホールとされる挿通孔5は、上下方向もしくは左右方向に長孔状に形成しても、全体的に孔径を大きく形成しても良い。   The stud bolt 2 is inserted through the insertion hole 5 in a penetrating state. The insertion hole 5 is formed as a loose hole so that the stud bolt 2 can be passed through with moderate flexibility. The insertion hole 5 to be a loose hole may be formed in the shape of a long hole in the vertical direction or the horizontal direction, or may have a large hole diameter as a whole.

第1実施形態にあっては図2に示すように、杭頭部外周面1aに面する挿通孔5の端部には、スタッドボルト2をスタッド溶接する際に生じるフラッシュ7を避けると共に杭頭部外周面1aに向かって挿通孔5の孔径を広げるために、テーパ状のザグリ8が形成されている。   In the first embodiment, as shown in FIG. 2, the end of the insertion hole 5 facing the pile head outer peripheral surface 1a avoids the flash 7 generated when the stud bolt 2 is stud welded, and the pile head. In order to widen the hole diameter of the insertion hole 5 toward the outer peripheral surface 1a, a tapered counterbore 8 is formed.

杭頭部外周面1aに面する接続金物4の表面4aは、どのような杭径の杭頭部外周面1aに対しても適合して当接させ得るように、平坦面で形成される。スタッドボルト2を挿通孔5に挿通することにより、湾曲している杭頭部外周面1aに対して、接続金物4の平坦な表面4aを当接させると、図5に示すように、スタッドボルト2の左右両脇には、杭頭部外周面1aと接続金物4の平坦な表面4aとの間に間隙Qが形成される。   The surface 4a of the connection hardware 4 facing the pile head outer peripheral surface 1a is formed as a flat surface so as to be able to fit and abut against the pile head outer peripheral surface 1a of any pile diameter. By inserting the stud bolt 2 into the insertion hole 5 and bringing the flat surface 4a of the connection hardware 4 into contact with the curved outer surface 1a of the pile head, as shown in FIG. A gap Q is formed between the pile head outer peripheral surface 1 a and the flat surface 4 a of the connection hardware 4 on both the left and right sides of 2.

このような接続金物4の当接状態で、挿通孔5を貫通させたスタッドボルト2に、ワッシャ9を介して螺着して、ナット10が設けられる。   A nut 10 is provided by being screwed to a stud bolt 2 that has passed through the insertion hole 5 through a washer 9 in a contact state of such a connection metal piece 4.

次に、第1実施形態に係る杭頭接合構造の作用について説明する。まず、杭頭部外周面1aに、スタッドボルト2を溶接接合する。次いで、スタッドボルト2を挿通孔5に挿通して、接続金物4をスタッドボルト2に装着する。この際、接続金物4の平坦な表面4aが一箇所で、湾曲している杭頭部外周面1aに当接する。   Next, the effect | action of the pile head junction structure which concerns on 1st Embodiment is demonstrated. First, the stud bolt 2 is welded to the pile head outer peripheral surface 1a. Next, the stud bolt 2 is inserted into the insertion hole 5, and the connection hardware 4 is attached to the stud bolt 2. At this time, the flat surface 4a of the connection hardware 4 comes into contact with the curved pile head outer peripheral surface 1a at one place.

その後、ナット10を、ワッシャ9を介してスタッドボルト2に螺着することで、接続金物4を杭1の杭頭部に取り付ける。最後に、接続金物4の雌ネジ孔6に、アンカー鉄筋3の端部を螺入する。これにより、スタッドボルト2及び接続金物4を介して、アンカー鉄筋3が杭1に接続される。アンカー鉄筋3は、接続金物4を杭頭部外周面1aに設置する前に、予め当該接続金物4に接続しておいても良い。   After that, the connection hardware 4 is attached to the pile head of the pile 1 by screwing the nut 10 to the stud bolt 2 via the washer 9. Finally, the end of the anchor reinforcing bar 3 is screwed into the female screw hole 6 of the connection hardware 4. As a result, the anchor reinforcing bar 3 is connected to the pile 1 via the stud bolt 2 and the connection hardware 4. The anchor rebar 3 may be connected to the connection hardware 4 in advance before the connection hardware 4 is installed on the pile head outer peripheral surface 1a.

ところで、接続金物4を杭頭部外周面1aに取り付けた状態では、スタッドボルト2とルーズホールである挿通孔5とは融通が利く状態であると共に、杭頭部外周面1aと接続金物4の平坦な表面4aとの間には間隙Qが形成されている。その後、杭1の杭頭部周辺にコンクリートを打設した際、そのコンクリートやノロ等が杭頭部外周面1aと表面4aの間の間隙Qに流れ込む。   By the way, in the state which attached the connection metal fitting 4 to the pile head outer peripheral surface 1a, while the stud bolt 2 and the insertion hole 5 which is a loose hole are flexible, the pile head outer peripheral surface 1a and the connection metal fitting 4 A gap Q is formed between the flat surface 4a. After that, when concrete is placed around the pile head of the pile 1, the concrete, the noro, and the like flow into the gap Q between the pile head outer peripheral surface 1a and the surface 4a.

間隙Qへ流れ込んだノロ等は、当該間隙Qを埋めると共に、上記テーパ状のザクリ8によって円滑に挿通孔5内へと流れ込む。挿通孔5内へ流れ込んだノロ等は、スタッドボルト2と挿通孔5の間に充填されることとなる。ノロ等はその後、間隙Q及び挿通孔5内で固化する。   Noro or the like flowing into the gap Q fills the gap Q and smoothly flows into the insertion hole 5 by the tapered counterbore 8. Noro or the like flowing into the insertion hole 5 is filled between the stud bolt 2 and the insertion hole 5. Thereafter, the solids and the like are solidified in the gap Q and the insertion hole 5.

以上説明した第1実施形態に係る杭頭接合構造にあっては、接続金物4の平坦な表面4aによって杭頭部外周面1aとの間に形成できる間隙Qから挿通孔5内へ流れ込むノロ等により、挿通孔5内部を埋めることができ、その内方でスタッドボルト2ががたついたり片当たりすることを防止できると共に、ノロ等の介在により、アンカー鉄筋3に作用する力をスタッドボルト2の長さ方向ほぼ全断面で負担させることができ、スタットボルト2側の杭頭部外周面1aと、接続金物4側のアンカー鉄筋3との固定度合やせん断耐力など、接合性能を格段に向上することができる。   In the pile head joint structure according to the first embodiment described above, a slot that flows into the insertion hole 5 from the gap Q that can be formed between the flat surface 4a of the connection hardware 4 and the pile head outer peripheral surface 1a, etc. Thus, the inside of the insertion hole 5 can be filled, and the stud bolt 2 can be prevented from rattling or hitting against the inside thereof, and the force acting on the anchor rebar 3 can be applied to the stud bolt 2 by intervening a slot. It can be borne by almost all cross sections in the length direction of the joint, and the joint performance such as the fixing degree and shear strength of the pile head outer peripheral surface 1a on the stat bolt 2 side and the anchor rebar 3 on the connection hardware 4 side are remarkably improved. can do.

また、杭頭部外周面1aに面する接続金物表面4aを平坦面としたので、どのような杭径であっても、それらの杭頭部外周面1aに対応して当接させることができ、汎用性高く適用することができる。   Moreover, since the connecting hardware surface 4a facing the pile head outer peripheral surface 1a is a flat surface, any pile diameter can be brought into contact with the pile head outer peripheral surface 1a. Can be applied with high versatility.

図6には、第1実施形態の変形例が示されている。杭頭部外周面1aに面する接続金物4の表面4aには、接続金物4の上面から下面にかけて上下方向縦向きに溝11が形成される。溝11は、接続金物4を貫通する挿通孔5と連通するように、挿通孔5位置を経過するように形成される。   FIG. 6 shows a modification of the first embodiment. On the surface 4a of the connection hardware 4 facing the pile head outer peripheral surface 1a, a groove 11 is formed in the vertical direction from the upper surface to the lower surface of the connection hardware 4. The groove 11 is formed so as to pass through the position of the insertion hole 5 so as to communicate with the insertion hole 5 penetrating the connection hardware 4.

溝11は、接続金物4の表面4aを杭頭部外周面1aに押し当てた際、その内面11aが杭頭部外周面1aとの間に隙間Cを空けた状態となる形態で形成される。また溝11は、接続金物4の表面4aを杭頭部外周面1aに押し当てた際、左右一対の開口縁部11bが二箇所で杭頭部外周面1aと当接する形態で形成される。このような溝11は例えば、断面弧状の形態とした場合、湾曲面となる内面11aの曲率半径を杭頭部外周面1aの曲率半径よりも小さくすればよい。また、溝11を断面長方形状とする形態では、杭頭部外周面1aが溝内面11aに接しないように、溝11の開口幅寸法を狭めるか、溝11の深さを深くすればよい。   The groove 11 is formed in such a form that when the surface 4a of the connection hardware 4 is pressed against the pile head outer peripheral surface 1a, the inner surface 11a is in a state of leaving a gap C between the pile head outer peripheral surface 1a. . Moreover, the groove | channel 11 is formed in the form which contact | abuts the pile head outer peripheral surface 1a in two places when a surface 4a of the connection metal fitting 4 is pressed on the pile head outer peripheral surface 1a. When such a groove | channel 11 is made into the shape of a cross-sectional arc shape, what is necessary is just to make the curvature radius of the inner surface 11a used as a curved surface smaller than the curvature radius of the pile head outer peripheral surface 1a. Moreover, in the form which makes the groove | channel 11 rectangular cross-section, what is necessary is just to narrow the opening width dimension of the groove | channel 11 or make the depth of the groove | channel 11 deep so that the pile head outer peripheral surface 1a may not contact the groove | channel inner surface 11a.

このような溝11を備えた接続金物4では、これを杭頭部外周面1aに押し当てた際、溝11の一対の開口縁部11bが、曲面である杭頭部外周面1aを挟み込むように二箇所で当接するので、接続金物4を安定的に杭頭部外周面1aに押し当てることができ、当該接続金物4、ひいてはアンカー鉄筋3を杭頭部外周面1aへ接続するときの作業性を向上することができる。   In the connection hardware 4 provided with such a groove 11, when this is pressed against the pile head outer peripheral surface 1a, the pair of opening edge portions 11b of the groove 11 sandwich the pile head outer peripheral surface 1a which is a curved surface. Since the connection hardware 4 can be stably pressed against the pile head outer peripheral surface 1a, the work for connecting the connection hardware 4, and eventually the anchor rebar 3 to the pile head outer peripheral surface 1a can be performed. Can be improved.

また、溝11の一対の開口縁部11bは、杭頭部外周面1aを挟む形態であるので、上記第1実施形態と同様に、種々の杭径の杭頭部外周面1aに対応させることができ、汎用性高く適用することができる。   Moreover, since a pair of opening edge part 11b of the groove | channel 11 is a form which pinches the pile head outer peripheral surface 1a, it is made to respond | correspond to the pile head outer peripheral surface 1a of various pile diameters similarly to the said 1st Embodiment. Can be applied with high versatility.

さらに、このような変形例であっても、杭頭部周辺に打設したコンクリートやそのノロ等が、接続金物4に形成された溝11より、当該溝11と杭頭部外周面1aとの間の隙間Cへ流れ込み、さらに溝11と連通する挿通孔5内部へと流れ込むこととなるので、上記第1実施形態と同様に、スタッドボルト2のがたつき等を防止して、高い接合性能を発揮させることができる。   Furthermore, even in such a modified example, the concrete and the nose, etc., placed around the pile head are formed by the groove 11 and the pile head outer peripheral surface 1a from the groove 11 formed in the connection hardware 4. Since it flows into the clearance C between them, and further flows into the insertion hole 5 communicating with the groove 11, as in the first embodiment, the stud bolt 2 is prevented from rattling and the like, and has high joining performance. Can be demonstrated.

図7には、第1実施形態の他の変形例が示されている。この変形例は、一本のアンカー鉄筋3に対し、上下二本で一組のスタッドボルト2を用いるようにしたものである。三本以上であっても良いことはもちろんである。二本以上のスタッドボルト2の配列は、上下方向に配列する場合の他、周方向に配列しても良い。   FIG. 7 shows another modification of the first embodiment. In this modification, one set of stud bolts 2 is used for two anchors for one anchor reinforcing bar 3. Of course, three or more may be used. The arrangement of the two or more stud bolts 2 may be arranged in the circumferential direction in addition to the arrangement in the vertical direction.

図8から図10には、第2実施形態に係る杭頭接合構造が示されている。第2実施形態の接続金物4は、開断面が上向きとされる鋼製U字状片12と、当該U字状片12の先端部同士を連結する連結片13とから構成され、この連結片13により開断面が閉断面となっている。   8 to 10 show a pile head joint structure according to the second embodiment. The connection hardware 4 of the second embodiment is composed of a steel U-shaped piece 12 whose open cross section is upward, and a connecting piece 13 that connects the tip portions of the U-shaped piece 12, and this connecting piece. 13, the open cross section is a closed cross section.

U字状片12は、鋼製板状材を曲げ加工するなどして形成される。連結片13は本実施形態では、U字状片12の先端間に架設される孔あき鋼製平板材13aの上下に、当該孔に合わせて二つのナット13bを配設して構成され、アンカー鉄筋3の端部の接続部とされる。U字状片12には、連結片13の下方に、第1実施形態のルーズホールで形成される挿通孔5と同様に、スタッドボルト2が貫通する挿通用空所14が左右方向横向きに区画形成される。この挿通用空所14にコンクリートやノロ等Nが充填される。   The U-shaped piece 12 is formed by bending a steel plate-like material. In the present embodiment, the connecting piece 13 is configured by arranging two nuts 13b on the upper and lower sides of a perforated steel plate member 13a laid between the tips of the U-shaped piece 12 in accordance with the hole, The connecting portion at the end of the reinforcing bar 3 is used. In the U-shaped piece 12, an insertion space 14 through which the stud bolt 2 penetrates is defined horizontally below the connecting piece 13, similarly to the insertion hole 5 formed by the loose hole of the first embodiment. It is formed. The insertion space 14 is filled with N, such as concrete or paste.

杭頭部外周面1aへの接続金物4等の接合作業は、上記第1実施形態と同様である。U字状片12は、杭頭部外周面1aに面する端面12aが平坦面で形成されていて、第1実施形態の図5に示した状態で杭頭部外周面1aに一箇所で当接されることとなり、当該第1実施形態と同様の作用効果を奏する。   The joining work of the connection hardware 4 and the like to the pile head outer peripheral surface 1a is the same as that in the first embodiment. The U-shaped piece 12 is formed with a flat end surface 12a facing the pile head outer peripheral surface 1a. The U-shaped piece 12 contacts the pile head outer peripheral surface 1a at one location in the state shown in FIG. 5 of the first embodiment. As a result, the same effects as those of the first embodiment can be obtained.

図11および図12には、第2実施形態の第1変形例が示されている。この第1変形例は、第2実施形態の構造を前提として、杭頭部外周面1aに面する連結片13の端面及びU字状片12の端面(底部)に、第1実施形態の変形例で示した溝11に対応する切り欠き15を形成したものである。切り欠き15は、その内面15aが杭頭部外周面1aとの間に隙間を空けた状態で一対の開口縁部15bが当該杭頭部外周面1aと当接する。   11 and 12 show a first modification of the second embodiment. This first modification is based on the structure of the second embodiment, and the end face of the connecting piece 13 facing the pile head outer peripheral surface 1a and the end face (bottom) of the U-shaped piece 12 are deformed from the first embodiment. A notch 15 corresponding to the groove 11 shown in the example is formed. The notch 15 has a pair of opening edge portions 15b in contact with the pile head outer peripheral surface 1a in a state in which a gap is formed between the inner surface 15a and the pile head outer peripheral surface 1a.

従って、この第1変形例にあっては、二箇所での当接と、切り欠き15からのノロ等の流入とを確保でき、上記第1実施形態の変形例と同様の作用効果を奏する。   Therefore, in this first modified example, it is possible to ensure contact at two locations and inflow of a slot or the like from the notch 15, and the same effects as the modified example of the first embodiment are achieved.

図13および図14には、第2実施形態の第2変形例が示されている。この第2変形例は、第2実施形態の構造を前提として、連結片13が、U字状片12間に挟み込んで接合される六角形状の長ナットで構成され、これにアンカー鉄筋3の端部が接続される。連結片13は、U字状片12の一端側に寄せて設けられ、U字状片12の他端側には、上方に向かって開放されて、挿通用空所14と連通する縦向き空所16が形成される。   13 and 14 show a second modification of the second embodiment. In the second modified example, on the premise of the structure of the second embodiment, the connecting piece 13 is composed of a hexagonal long nut that is sandwiched and joined between the U-shaped pieces 12, and the end of the anchor reinforcing bar 3 is connected thereto. Parts are connected. The connecting piece 13 is provided close to one end side of the U-shaped piece 12, and the other end side of the U-shaped piece 12 is open upward and communicates with the insertion space 14. A location 16 is formed.

この第2変形例は、杭頭部外周面1aに面するU字状片12の端面(底部)が一箇所で杭頭部外周面1aに当接される構造であって、接続金物4の取付性は第1実施形態相当である一方で、上方へ開放された縦向き空所16を備えることから、コンクリートのノロ等の充填性は、第1実施形態の変形例相当であり、それらによって得られる作用効果と同等の作用効果を奏する。   This 2nd modification is the structure where the end surface (bottom part) of the U-shaped piece 12 which faces the pile head outer peripheral surface 1a is contact | abutted to the pile head outer peripheral surface 1a in one place, Comprising: While the mountability is equivalent to that of the first embodiment, it is provided with the vertical space 16 opened upward, so that the filling ability of concrete noro and the like is equivalent to a modification of the first embodiment, thereby The same effect as the obtained effect is produced.

図15および図16には、第2実施形態の第3変形例が示されている。この第3変形例は、上記第2変形例に対し、上記第1変形例の切り欠き15を追加して構成したもので、ノロ等の流入は第2変形例相当であり、さらに二箇所での当接により取付作業性が改善されて、上記第1実施形態の変形例と同様の作用効果を奏する。   15 and 16 show a third modification of the second embodiment. The third modified example is configured by adding the notch 15 of the first modified example to the second modified example, and the inflow of Noro and the like is equivalent to the second modified example, and further in two places. Due to the contact, the mounting workability is improved, and the same effects as the modified example of the first embodiment are achieved.

図17および図18には、第2実施形態の第4変形例が示されている。この第4変形例は、図11および図12に示した第1変形例の連結片13を、孔なしの鋼製平板材とし、これにアンカー鉄筋3の端部を溶接接合するようにしたものである。第4変形例にあっても、第1変形例と同様の作用効果を奏することはもちろんである。   17 and 18 show a fourth modification of the second embodiment. In this fourth modification, the connecting piece 13 of the first modification shown in FIGS. 11 and 12 is made of a steel flat plate without holes, and the end of the anchor reinforcing bar 3 is welded to this. It is. Even in the fourth modified example, it is needless to say that the same effects as the first modified example can be obtained.

特に、第2実施形態にあっては、U字状片12と、平板材やナット等からなる連結片13を組み合わせた接続金物4なので、挿通孔5の孔加工が必要な第1実施形態と異なり、孔加工することなくスタッドボルト2用の挿通用空所14を形成でき、接続金物4を、容易かつ安価に製作できると共に、軽量化することができる。   In particular, in the second embodiment, since the connection metal piece 4 is a combination of the U-shaped piece 12 and the connecting piece 13 made of a flat plate material, a nut or the like, the first embodiment requires drilling of the insertion hole 5. In contrast, the insertion space 14 for the stud bolt 2 can be formed without drilling, and the connection hardware 4 can be easily and inexpensively manufactured and can be reduced in weight.

上記いずれの実施形態や変形例にあっても、挿通孔5や挿通用空所14は、スタッドボルト2のスタッド溶接に伴うフラッシュ7の影響を受けないような大きさで形成することが望ましい。挿通孔5等を大きくすることに代えて、挿通孔5の開口縁にザクリ8を形成することで、フラッシュ7との干渉を避けるようにしても良い。また、溝11や切り欠き15の幅寸法を広げることで、フラッシュ7との干渉を避けるようにしても良い。   In any of the above-described embodiments and modifications, it is desirable that the insertion hole 5 and the insertion space 14 be formed in a size that is not affected by the flash 7 that accompanies stud welding of the stud bolt 2. Instead of enlarging the insertion hole 5 or the like, the counterbore 8 may be avoided by forming a counterbore 8 at the opening edge of the insertion hole 5. In addition, interference with the flash 7 may be avoided by widening the width of the groove 11 and the notch 15.

コンクリートやそのノロ等が挿通孔5へ流入しやすくするために、挿通孔5の開口縁を口広に形成しても良く、当該構成を上記ザグリ8で兼用するようにしても良い。上記実施形態では、コンクリートのノロ等を挿通孔5や挿通用空所14等へ充填するようにしたが、溝11や切り欠き15を介して予め別途グラウト材を充填しておくようにしても良い。また、図1中、仮想線で示すように、アンカー鉄筋3は、杭頭部の端板17に対しても適宜に接合するようにしても良い。   In order to facilitate the flow of concrete, its slot, or the like into the insertion hole 5, the opening edge of the insertion hole 5 may be formed wide, and the structure may be shared by the counterbore 8. In the above-described embodiment, the concrete slot or the like is filled into the insertion hole 5 or the insertion space 14. However, the grout material may be separately filled in advance through the groove 11 or the notch 15. good. Moreover, as shown by a virtual line in FIG. 1, the anchor rebar 3 may be appropriately joined to the end plate 17 of the pile head.

1 杭
1a 杭頭部外周面
2 スタッドボルト
3 アンカー鉄筋
4 接続金物
4a 接続金物表面
5 挿通孔
6 雌ネジ孔
10 ナット
11 溝
11a 溝の内面
11b 溝の開口縁部
12 U字状片
13 連結片
14 挿通用空所
15 切り欠き
15a 切り欠きの内面
15b 切り欠きの開口縁部
C 隙間
DESCRIPTION OF SYMBOLS 1 Pile 1a Pile head outer peripheral surface 2 Stud bolt 3 Anchor rebar 4 Connection metal 4a Connection metal surface 5 Insertion hole 6 Female screw hole 10 Nut 11 Groove 11a Groove inner surface 11b Groove opening edge 12 U-shaped piece 13 Connection piece 14 Insertion space 15 Notch 15a Notch inner surface 15b Notch opening edge C Clearance

Claims (4)

杭の杭頭部外周面を形成する鋼管にこれより外方へ向かって横向きに接合したスタッドボルトに、該スタッドボルトが貫通する挿通部及びアンカー鉄筋の端部が接続される接続部を有する接続金物を挿通し、該接続金物を貫通させた該スタッドボルトにナットを螺着することで、該接続金物を該杭頭部外周面に当接させつつ、該アンカー鉄筋を該杭頭部に接続するようにした杭頭接合構造であって、
上記挿通部は上記スタッドボルトに対してルーズホールで形成されるとともに、上記杭頭部外周面に面する上記接続金物表面が平坦面で形成されることを特徴とする杭頭接合構造。
A connection comprising a stud bolt joined laterally outwardly to a steel pipe forming an outer peripheral surface of a pile head of the pile, and a connection portion to which an insertion portion through which the stud bolt penetrates and an end portion of an anchor reinforcing bar are connected Insert the hardware and screw the nut onto the stud bolt that has penetrated the connection hardware to connect the anchor rebar to the pile head while bringing the connection hardware into contact with the outer peripheral surface of the pile head A pile head joint structure designed to
The pile head joint structure, wherein the insertion portion is formed as a loose hole with respect to the stud bolt, and the surface of the connection hardware facing the outer peripheral surface of the pile head is formed as a flat surface.
前記杭頭部外周面に面する前記接続金物表面には、内面が該杭頭部外周面との間に隙間を空けた状態で一対の開口縁部が当該杭頭部外周面と当接するとともに前記挿通部と連通される溝が、上下方向縦向きに形成されることを特徴とする請求項1に記載の杭頭接合構造。   On the surface of the connection hardware facing the outer peripheral surface of the pile head, a pair of opening edges abut against the outer peripheral surface of the pile head with an inner surface having a gap between the outer peripheral surface of the pile head and The pile head joint structure according to claim 1, wherein the groove communicated with the insertion portion is formed vertically in the vertical direction. 前記接続金物は、上向きのU字状片と、該U字状片の端部同士を連結する連結片とからなり、前記挿通部が上記U字状片で形成されると共に、前記接続部が上記連結片で構成されることを特徴とする請求項1に記載の杭頭接合構造。   The connection hardware consists of an upward U-shaped piece and a connecting piece that connects ends of the U-shaped piece, the insertion part is formed of the U-shaped piece, and the connection part is The pile head joint structure according to claim 1, comprising the connection piece. 前記U字状片の底部には、内面が前記杭頭部外周面との間に隙間を空けた状態で一対の開口縁部が当該杭頭部外周面と当接する切り欠きが形成されることを特徴とする請求項3に記載の杭頭接合構造。   At the bottom of the U-shaped piece, a notch is formed in which a pair of opening edges contact the outer peripheral surface of the pile head in a state where a gap is formed between the inner surface and the outer peripheral surface of the pile head. The pile head joint structure according to claim 3, wherein:
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014084573A (en) * 2012-10-19 2014-05-12 Okabe Co Ltd Pile head joint structure

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JP2001182079A (en) * 1999-12-28 2001-07-03 Okabe Co Ltd Fixing structure of anchor reinforcement to steel pipe pile head, and steel pipe pile with anchor reinforcement
JP2002115256A (en) * 2000-10-11 2002-04-19 Sumitomo Metal Ind Ltd Structure for head part of foundation pile
JP2002115248A (en) * 2000-10-11 2002-04-19 Sumitomo Metal Ind Ltd Structure for head part of foundation pile
JP2002256552A (en) * 2001-03-05 2002-09-11 Nippon Steel Corp Position adjustable joining structure of steel pipe pile and anchor reinforcement
JP2004308359A (en) * 2003-04-10 2004-11-04 Nippon Stud Welding Co Ltd Pile head jointing structure of precast concrete pile
JP2004308358A (en) * 2003-04-10 2004-11-04 Nippon Stud Welding Co Ltd Pile head structure of precast concrete pile
JP2005098050A (en) * 2003-09-24 2005-04-14 Kukan Kikaku Sekkei:Kk Pile head joint structure by simple joint female die method

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Publication number Priority date Publication date Assignee Title
JPH10245855A (en) * 1997-03-07 1998-09-14 Tootec:Kk Reinforcing connection device for steel pipe pile
JP2001182079A (en) * 1999-12-28 2001-07-03 Okabe Co Ltd Fixing structure of anchor reinforcement to steel pipe pile head, and steel pipe pile with anchor reinforcement
JP2002115256A (en) * 2000-10-11 2002-04-19 Sumitomo Metal Ind Ltd Structure for head part of foundation pile
JP2002115248A (en) * 2000-10-11 2002-04-19 Sumitomo Metal Ind Ltd Structure for head part of foundation pile
JP2002256552A (en) * 2001-03-05 2002-09-11 Nippon Steel Corp Position adjustable joining structure of steel pipe pile and anchor reinforcement
JP2004308359A (en) * 2003-04-10 2004-11-04 Nippon Stud Welding Co Ltd Pile head jointing structure of precast concrete pile
JP2004308358A (en) * 2003-04-10 2004-11-04 Nippon Stud Welding Co Ltd Pile head structure of precast concrete pile
JP2005098050A (en) * 2003-09-24 2005-04-14 Kukan Kikaku Sekkei:Kk Pile head joint structure by simple joint female die method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014084573A (en) * 2012-10-19 2014-05-12 Okabe Co Ltd Pile head joint structure

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