JP4083714B2 - Pile head joint rebar - Google Patents
Pile head joint rebar Download PDFInfo
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- JP4083714B2 JP4083714B2 JP2004217026A JP2004217026A JP4083714B2 JP 4083714 B2 JP4083714 B2 JP 4083714B2 JP 2004217026 A JP2004217026 A JP 2004217026A JP 2004217026 A JP2004217026 A JP 2004217026A JP 4083714 B2 JP4083714 B2 JP 4083714B2
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- reinforcing bar
- pile
- pile head
- bolt body
- end plate
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Description
本発明は、ＰＣ杭の杭頭とコンクリート構造物との接合に際して、コンクリート構造物中に他端側が埋設され、一端側において杭頭端板に接合する異形鉄筋等からなる杭頭接合鉄筋に関する。 The present invention relates to a pile head joint reinforcing bar composed of a deformed reinforcing bar or the like, in which the other end side is embedded in a concrete structure and joined to a pile head end plate at one end side when joining the pile head of a PC pile and a concrete structure.
従来の杭頭接合鉄筋は、異形鉄筋の一端部を切削して雄ねじ状に加工したり（特許文献１参照）、または異形鉄筋の一端部を熱間鍛造等で太く成形し、その太くなった部分を切削してねじを形成するなどして作製されている。
上記従来の杭頭接合鉄筋においては、それぞれ次のような問題点がある。すなわち、前者のものでは、異形鉄筋の一端側の外周面を切削して雄ねじ部を形成するから、当該ねじ部が鉄筋径よりも小径になって断面欠損が生じる。さらに、ＰＣ杭の端板に設けられたねじ孔に適合する雄ねじ部を異形鉄筋の一端部の切削により形成するから、そのねじ孔以上の太さの異形鉄筋を選択してねじ加工しなければならない。そのために、設計強度から見ると、異常に大きな（太い）異形鉄筋を選択することになり、不経済である上に、大径の異形鉄筋であるから、重くて取り扱い難く、労力を要して作業性が悪いといった問題がある。 Each of the conventional pile head joint reinforcing bars has the following problems. That is, in the former, the outer peripheral surface on one end side of the deformed reinforcing bar is cut to form the male threaded portion, so that the threaded portion becomes smaller in diameter than the reinforcing bar diameter and a cross-sectional defect occurs. Furthermore, since the male thread part that fits the screw hole provided in the end plate of the PC pile is formed by cutting one end part of the deformed reinforcing bar, a deformed reinforcing bar with a thickness larger than that of the threaded hole must be selected and screwed. Don't be. Therefore, from the viewpoint of design strength, an abnormally large (thick) deformed rebar is selected, which is not economical, and because it is a large diameter deformed rebar, it is heavy, difficult to handle, and requires labor. There is a problem that workability is bad.
また、後者のものにおいては、異形鉄筋の一端部を熱間鍛造等により太く加工するから、その加工部分の寸法精度が悪くなる。そのために、外周面に雄ねじ部を形成する前に当該太径部分の切削が必要になり、加工工程が増えてコストが高くなるという問題がある。 In the latter case, since one end of the deformed reinforcing bar is processed thickly by hot forging or the like, the dimensional accuracy of the processed part is deteriorated. For this reason, there is a problem that the large-diameter portion needs to be cut before the male thread portion is formed on the outer peripheral surface, which increases the number of processing steps and increases the cost.
本発明は、上記従来技術の問題点を解決するためになされたもので、設計に合った鉄筋径の異形鉄筋を選択することができ、細径の異形鉄筋を使用することにより、軽量で取り扱い易く、経済的な杭頭接合鉄筋を提供することを目的とする。 The present invention has been made to solve the above-mentioned problems of the prior art, and can select a deformed reinforcing bar having a rebar diameter suitable for the design, and can be handled lightly by using a deformed reinforcing bar having a small diameter. An object is to provide an easy and economical pile head joint rebar.
本発明に係る杭頭接合鉄筋では、端部にＰＣ杭の端板のねじ孔に螺合可能な雄ねじ部を備え、その雄ねじ部の余長部分に前記端板に対する締付け固着用のナットを螺嵌可能に構成した中空状のボルト体と、該ボルト体の他端側の内部に端部が挿入された状態で前記ボルト体の絞り込みによりほぼ同じ軸心に固着された異形鉄筋とから杭頭接合鉄筋を構成するという技術手段を採用した。 In the pile head joint reinforcing bar according to the present invention, a male screw portion that can be screwed into a screw hole of an end plate of a PC pile is provided at an end portion, and a nut for fastening and fixing to the end plate is screwed into an extra length portion of the male screw portion. Pile head from a hollow bolt body configured to be fitable, and a deformed reinforcing bar fixed to substantially the same axis by narrowing down the bolt body with the end inserted into the other end of the bolt body The technical means of constructing the joining rebar was adopted.
本発明によれば、ＰＣ杭の端板に設けられたねじ孔に適合するとともに、その余長部分に締付け用のナットを螺嵌可能な雄ねじ部を備える中空状のボルト体と異形鉄筋とをそれぞれ用意し、そのボルト体の他端側の内部へ異形鉄筋の端部を挿入して固着することにより杭頭接合鉄筋を構成するものであるから、下記のような効果を得ることができる。
（１）必要な鉄筋径の異形鉄筋からなる杭頭接合鉄筋を、ボルト体を介してＰＣ杭の端板に設けられた各種のねじ孔に適合するねじ径で作製することができる。
（２）ＰＣ杭の端板に設けられたねじ孔に関係なく、設計に合った鉄筋径の異形鉄筋を選択し、その異形鉄筋をＰＣ杭の端板に設けられた大きな径のねじ孔に対しても取り付けることができるから、異形鉄筋が必要以上に太径にならず経済的である。
（３）中空状のボルト体を採用したので、より大径の雄ねじ部を介してＰＣ杭の端板に対する強固な固着が可能である。しかも、ボルト体が中空状であることから、より少ない材料によって大径の雄ねじ部が形成できるので経済的であるとともに、部材の軽量化による取り扱い易さの向上にも有効である。
（４）異形鉄筋を加工することなくそのまま使用可能であるから、異形鉄筋に断面欠損が発生せず、所定の鉄筋耐力が確保される。
（５）細径の異形鉄筋を使用した場合でも、ＰＣ杭の端板に設けられたねじ孔に対する中空状のボルト体からなる螺合部の強度は大きいので、前記異形鉄筋に基づく所定の杭頭接合鉄筋の耐力を容易に確保できる。
According to the present invention, a hollow bolt body and a deformed reinforcing bar that have a male threaded portion that fits into a screw hole provided in an end plate of a PC pile and that can be screwed with a tightening nut in its extra length portion. each prepared, because it constitutes the pile head joint reinforcement by fixing by inserting the end portion of the deformed bar to the inside of the other end of the bolt body, it has the advantages described below.
(1) A pile head joint reinforcing bar made of a deformed reinforcing bar with a required reinforcing bar diameter can be produced with a screw diameter suitable for various screw holes provided in an end plate of a PC pile via a bolt body.
(2) Regardless of the screw holes provided on the end plate of the PC pile, select a deformed reinforcing bar with a diameter suitable for the design, and replace the deformed reinforcing bar with a large diameter screw hole provided on the end plate of the PC pile. Since it can also be attached, the deformed reinforcing bar does not become thicker than necessary and is economical.
(3) Since the hollow bolt body is adopted, it is possible to firmly fix the PC pile end plate via the larger-diameter male screw portion. In addition, since the bolt body is hollow, a large-diameter male thread portion can be formed with a smaller amount of material, which is economical and effective in improving the ease of handling by reducing the weight of the member.
( 4 ) Since the deformed reinforcing bar can be used as it is without being processed, a cross-sectional defect does not occur in the deformed reinforcing bar, and a predetermined reinforcing bar strength is ensured.
(5) Even when a thin deformed reinforcing bar is used, the strength of the screwed portion made of a hollow bolt body with respect to the screw hole provided in the end plate of the PC pile is large, so the predetermined pile based on the deformed reinforcing bar The strength of the head joint rebar can be easily secured .
以下、図面に基づき、本発明の実施例について詳細に説明する。図１〜図３は本発明の実施例を示したもので、それぞれ本実施例に係る杭頭接合鉄筋の正面図、その部分断面図及び前記杭頭接合鉄筋の固着前の状態を示した正面図である。その構成を図面に基づいて説明すれば、図示のように本発明による杭頭接合鉄筋ａは、中空状のボルト体１と異形鉄筋４からなり、そのボルト体１の外周面には他方の端部９を残して転造または切削加工により雄ねじ部２が形成されている。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 show an embodiment of the present invention, each of which is a front view of a pile head joint reinforcing bar according to the present embodiment, a partial sectional view thereof, and a front view showing a state before the pile head joint reinforcing bar is fixed. FIG. If the structure is demonstrated based on drawing, the pile head joining reinforcing bar a by this invention will be comprised from the hollow bolt body 1 and the deformed reinforcing
そして、図３に示すように、中空状のボルト体１の端部９内に異形鉄筋４の端部を挿入した後、そのボルト体１の端部９をダイス等によって絞り込み、異形鉄筋４の端部に食込み圧着させてそれら絞り込み部５を固着すると同時に、端部９の外周面を六角形状のスパナ掛け部３に形成することにより、杭頭接合鉄筋ａを構成する。異形鉄筋４としては設計に適合した鉄筋径のものが使用される。Then, as shown in FIG. 3, after inserting the end portion of the deformed reinforcing
次に、本発明による杭頭接合鉄筋ａの使用方法について、図４及び図５を参照しながら説明する。ＰＣ杭ｂの杭頭に固着された端板７には、多数のねじ孔８が適宜間隔で設けられている。
Next, how to use the Pile joining reinforcing bars a in accordance with the present invention will be described with reference to FIGS. A large number of
このようなＰＣ杭ｂに対して、杭頭接合鉄筋ａを、そのボルト体１の雄ねじ部２にナット６をスパナ掛け部３の近くまで予めねじ込んだ状態で、雄ねじ部２をＰＣ杭ｂの端板７のねじ孔８に螺合する。
With respect to such a PC pile b, the pile head joining rebar a is screwed into the male threaded
そして、ボルト体１のスパナ掛け部３にスパナまたは回転用治具等を係合し、杭頭接合鉄筋ａを回転してそのボルト体１をＰＣ杭ｂにおける端板７の下面側のコンクリート部に当接するまでねじ込んだ後、ナット６を端板７の方向に締め付ければ、ＰＣ杭ｂの端板７に対して杭頭接合鉄筋ａが堅固に固着される。
Then, a spanner or a jig for rotation is engaged with the
なお、上記ナット６に代え、ねじ孔を設けたカプラー等を使用しても、上記と同様に作用する。
In addition, it replaces with the
ａ…杭頭接合鉄筋、ｂ…ＰＣ杭、１…ボルト体、２…雄ねじ部、３…スパナ掛け部、４…異形鉄筋、５…絞り込み部（固着部）、６…ナット、７…端板、８…ねじ孔、９…端部 a ... Pile head joint rebar, b ... PC pile, 1 ... Bolt body, 2 ... Male screw part, 3 ... Spanner hanger part, 4 ... Deformed bar, 5 ... Narrowing part (adhering part), 6 ... Nut, 7 ... End plate , 8 ... Screw hole , 9 ... End
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004217026A JP4083714B2 (en) | 2004-07-26 | 2004-07-26 | Pile head joint rebar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004217026A JP4083714B2 (en) | 2004-07-26 | 2004-07-26 | Pile head joint rebar |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22308497A Division JP3654749B2 (en) | 1997-08-04 | 1997-08-04 | Pile head joint reinforcement mounting structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004346736A JP2004346736A (en) | 2004-12-09 |
| JP4083714B2 true JP4083714B2 (en) | 2008-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004217026A Expired - Lifetime JP4083714B2 (en) | 2004-07-26 | 2004-07-26 | Pile head joint rebar |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5281840B2 (en) * | 2008-07-25 | 2013-09-04 | 大成建設株式会社 | Screw fastening mechanism |
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2004
- 2004-07-26 JP JP2004217026A patent/JP4083714B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JP2004346736A (en) | 2004-12-09 |
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