JP4439208B2 - Rebar joint - Google Patents
Rebar joint Download PDFInfo
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- JP4439208B2 JP4439208B2 JP2003195234A JP2003195234A JP4439208B2 JP 4439208 B2 JP4439208 B2 JP 4439208B2 JP 2003195234 A JP2003195234 A JP 2003195234A JP 2003195234 A JP2003195234 A JP 2003195234A JP 4439208 B2 JP4439208 B2 JP 4439208B2
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- Prior art keywords
- joint
- coupler
- grout material
- rebar
- 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.)
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Description
【０００１】
【発明の属する技術分野】
本発明は、鉄筋継手に関し、特に、鉄筋の機械式継手に関する。
【０００２】
【従来の技術】
従来より、鉄筋継手として、２本のねじ節鉄筋をカプラーで連結し、前記２本の鉄筋にそれぞれ螺合された一対のロックナットを前記カプラーの両端面に向かって締め付ける機械式継手が用いられることがある。しかし、このような機械式継手では、施工に非常に手間がかかる、ロックナット締め付け用の工具が何セットも必要となる、締め付けた後にロックナットが緩むことがある、といった問題がある。そのため、特許文献１では、軸方向の両端部にねじ穴が設けられるとともに内周面に突条部を有するスリーブに、２本の異形鉄筋を挿入し、前記スリーブのねじ穴に螺合するボルトによって前記２本の異形鉄筋を前記突条部に押し付けた状態で、前記スリーブ内にグラウト材を充填する鉄筋継手が考案されている。
【０００３】
【特許文献１】
特開２００２−２５６６５５号公報（第２−３頁、第１図）
【０００４】
【発明が解決しようとする課題】
しかしながら、特許文献１に記載の鉄筋継手は、カプラーによる鉄筋継手と比較して、形状が太くて長くなるため、鉄筋が高密度で配筋される部位において使用しづらい問題があった。
本発明は、上述する問題点に鑑みてなされたもので、施工効率の改善が図れる鉄筋継手を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明に係る鉄筋継手では、内周に雌ねじが形成された略筒状のカプラー両端からそれぞれねじ節鉄筋を挿入し、前記カプラーの雌ねじとねじ節鉄筋の雄ねじとの間の螺合部の空隙にグラウト材を充填することにより、ロックナットを用いることなく前記ねじ節鉄筋を接合する鉄筋継手であって、前記グラウト材に膨張材を混入し、前記螺合部の空隙への前記グラウト材充填後１週目における弾性域正負繰り返し試験での２０回目加力時の接合鉄筋の割線剛性を１回目の加力時の接合鉄筋の割線剛性で除した値が０．５より高く、しかも、２０回目の加力時の接合鉄筋のすべり変形量が０．３ｍｍ以下となるように、前記グラウト材の膨張によるカプラー内の体積歪を、前記カプラー内にケミカルプレストレスが導入可能な２０００μ以上とすることを特徴とする。
ここで、体積歪は、体積の変化量を元の体積で除した値であり、μは、１０−６を意味する。
グラウト材に膨張材を混入することにより、鉄筋とカプラーとの間の非常に狭い空隙内でグラウト材を膨張させ、グラウト材の膨張による体積歪が２０００μ以上になると、グラウト材の膨張がカプラーに抑制されて、カプラー内にケミカルプレストレスが導入され、鉄筋継手の力学的性能が向上するものである。特に、鉄筋とカプラーとの遊びがなくなるため、初期歪を小さくすることができる。
本発明によれば、カプラー両端のロックナットを必要としないため、施工効率の改善が図れる鉄筋継手を実現することができる。
また、本発明では、カプラー内周に形成された雌ねじと、ねじ節鉄筋外周の雄ねじとが螺合されることにより、鉄筋の引き抜きに対して抵抗するものである。
また、本発明では、前記グラウト材の水結合材比を１５質量％以上２２質量％以下とすることが好ましい。
ここで、水結合材比は、グラウト材に含まれる水の質量をセメントを含む結合材の質量で除した値である。
鉄筋継手の力学的性能とグラウト材の圧縮強度には相関があり、グラウト材の圧縮強度が大きくなるほど鉄筋継手の引張り強度は大きくなる。また、グラウト材の圧縮強度は水結合材比を小さくするほど大きくなる。本発明においては、グラウト材の圧縮強度を１００Ｎ／ｍｍ２程度以上とする必要がある。そのため、後述する実験結果に基づき、水結合材比を２２質量％以下とする。一方、水結合材比を小さくしすぎるとグラウト材の充填性が悪くなるため、後述する実験結果に基づき、１５質量％以上とする。
【０００６】
【発明の実施の形態】
以下、本発明の実施形態を図面を参照して説明する。
図１は、本発明に係る鉄筋継手の実施形態の一例を示すものである。
この図に示すように、本実施形態による鉄筋継手では、内周に雌ねじ６が形成された略筒状のカプラー１に、ねじ節鉄筋２ａ、２ｂが螺合挿入されている。また、カプラー１中央部に設けられた注入孔４より、カプラー１とねじ節鉄筋２ａ、２ｂの間隙にはグラウト材３が充填されている。なお、グラウト材３をカプラー１の注入孔４から注入する際、カプラー１とねじ節鉄筋２ａ、２ｂの間隙から空気が抜けるため、空気抜き用の孔は特に必要としない。
グラウト材３には膨張材が混入されており、グラウト材３の膨張による体積歪が２０００μ以上となるように膨張材の混入量が調節されている。また、グラウト材３の圧縮強度を高めるために、グラウト材３の水結合材比は１５質量％以上２２質量％以下の範囲にある。
【０００７】
本実施形態による鉄筋継手では、カプラー１内周に形成された雌ねじ６と、ねじ節鉄筋２ａ、２ｂ外周の雄ねじ５とが螺合されることにより、ねじ節鉄筋２ａ、２ｂの引き抜きに対して抵抗するうえ、グラウト材３の高強度化および膨張材の使用によりカプラー１内に導入されるケミカルプレストレスによって鉄筋継手の力学的性能をさらに向上させることができる。特に、ねじ節鉄筋２ａ、２ｂとカプラー１との遊びがなくなるため、初期歪を小さくすることができる。
【０００８】
【実施例】
グラウト材として２種類のセメントを用い、膨張材を混入しない場合について、現場で練混ぜが行える範囲で水結合材比をできるだけ小さくして試験練りを行ったときの水結合材比および材齢２８日における圧縮強度を表１に示す。セメント１の場合では、水結合材比２２％程度が最小限度であり、そのときのグラウト材の圧縮強度は１４２Ｎ／ｍｍ２程度であった。また、セメント２の場合では、水結合材比１６％程度が最小限度であり、そのときのグラウト材の圧縮強度は１１５Ｎ／ｍｍ２程度であった。いずれも従来のグラウト材の圧縮強度７０Ｎ／ｍｍ２を大きく上回る結果が得られた。
【０００９】
【表１】
次に、セメント１に膨張材を混入したグラウト材を用いた鉄筋継手について、建設省住指発第３１号（平成３年１月３１日）［別添の１の１］鉄筋継手性能判定基準に示す弾性域正負繰返し試験を実施した結果を表２に示す。表２中、Ａ級継手規格とは、強度と剛性に関してはほぼ母材並みであるが、その他に関しては母材よりもやや劣る継手をいう。また、剛性低下率は、２０回目の加力時における接合鉄筋の割線剛性を１回目の加力時における接合鉄筋の割線剛性で除した値であり、すべり量は、２０回目の加力時における接合鉄筋のすべり変形である。なお、この際の割線剛性は、母材の規格降伏点の０．９５倍の応力における接合鉄筋の割線剛性である。
その結果、１週目において、膨張材を混入しない場合にはＡ級継手規格を満足しなかったが、膨張材を５％以上混入した場合にはＡ級継手規格を満足する結果が得られた。なお、セメント量に対して膨張材を５％程度混入すると、材齢２８日において、グラウト材の体積歪は５×１０４μから１×１０５μ程度となる測定結果が得られている。
【００１１】
【表２】
【発明の効果】
以上説明したように、本発明に係る鉄筋継手によれば、カプラー両端のロックナットを必要としないため、施工効率の改善が図れる鉄筋継手を実現することができる。
【図面の簡単な説明】
【図１】 本発明に係る鉄筋継手の実施形態の一例である。
【符号の説明】
１……カプラー
２ａ、２ｂ……ねじ節鉄筋
３……グラウト材
４……注入孔
５……雄ねじ
６……雌ねじ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing bar joint, and more particularly to a mechanical joint for a reinforcing bar.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a reinforcing bar joint, a mechanical joint is used in which two screw joint reinforcing bars are connected by a coupler, and a pair of lock nuts respectively screwed to the two reinforcing bars are tightened toward both end faces of the coupler. Sometimes. However, in such a mechanical joint, there are problems that it takes a lot of work to install, a number of sets of tools for tightening the lock nut are required, and the lock nut may loosen after tightening. For this reason, in Patent Document 1, screw holes are provided at both ends in the axial direction, and two deformed reinforcing bars are inserted into a sleeve having a protruding portion on the inner peripheral surface, and a bolt that is screwed into the screw hole of the sleeve. Thus, there has been devised a reinforcing bar joint in which a grout material is filled in the sleeve while the two deformed reinforcing bars are pressed against the protruding portion.
[0003]
[Patent Document 1]
JP 2002-256655 A (page 2-3, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, since the reinforcing bar joint described in Patent Document 1 is thicker and longer than the reinforcing bar joint made of a coupler, there is a problem that it is difficult to use in a portion where the reinforcing bars are arranged with high density.
This invention is made | formed in view of the problem mentioned above, and it aims at providing the reinforcement joint which can aim at improvement of construction efficiency.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the reinforcing bar joint according to the present invention, screw joint reinforcing bars are respectively inserted from both ends of a substantially cylindrical coupler in which a female thread is formed on the inner periphery, and the female thread of the coupler and the male thread of the threaded joint reinforcing bar are connected. by filling grout into the gap of the engagement portion between, a reinforcing bar joint joining said threaded section reinforcing bar without using a lock nut, the expandable material is mixed in the grout, the engagement portion The value obtained by dividing the secant stiffness of the joining rebar at the time of the 20th loading in the elastic range positive / negative repetition test in the first week after filling the gap with the grout material by the dividing line stiffness of the joining rebar at the first loading is 0. More than 5, and the amount of deformation in the coupler due to the expansion of the grout material is reduced by chemical prestress in the coupler so that the slip deformation amount of the joining rebar during the 20th loading is 0.3 mm or less. Guidance Characterized by a possible 2000μ more.
Here, the volume strain is a value obtained by dividing the change in volume by the original volume, and μ means 10 −6 .
By incorporating expandable material to grout, inflating the grout in a very narrow air gap between the reinforcing bar and the coupler, the volumetric strain caused by the expansion of the grout is more than 2,000, the expansion couplers grout It is suppressed, chemical prestress is introduced into the coupler, and the mechanical performance of the reinforced joint is improved. In particular, since there is no play between the reinforcing bar and the coupler, the initial strain can be reduced.
According to the present invention, since the lock nuts at both ends of the coupler are not required, it is possible to realize a reinforcing bar joint that can improve the construction efficiency.
In the present invention, the internal thread formed on the inner periphery of the coupler and the external thread on the outer periphery of the screw joint rebar are screwed together, thereby resisting the retraction of the rebar.
Moreover, in this invention, it is preferable that the water binder ratio of the said grout material shall be 15 to 22 mass%.
Here, the water binder ratio is a value obtained by dividing the mass of water contained in the grout material by the mass of the binder containing cement.
There is a correlation between the mechanical performance of the reinforced joint and the compressive strength of the grout material, and the tensile strength of the reinforced joint increases as the compressive strength of the grout material increases. In addition, the compressive strength of the grout material increases as the water binder ratio decreases. In the present invention, the compressive strength of the grout material needs to be about 100 N / mm 2 or more. Therefore, based on the experimental results described later, the water binder ratio is set to 22% by mass or less. On the other hand, if the water binder ratio is too small, the filling property of the grout material is deteriorated.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of an embodiment of a reinforcing bar joint according to the present invention.
As shown in this figure, in the reinforcing bar joint according to the present embodiment,
The expansion material is mixed in the grout material 3, and the mixing amount of the expansion material is adjusted so that the volume distortion due to expansion of the grout material 3 is 2000 μm or more. Moreover, in order to raise the compressive strength of the grout material 3, the water binder ratio of the grout material 3 exists in the range of 15 mass% or more and 22 mass% or less.
[0007]
In the reinforcing bar joint according to the present embodiment, the
[0008]
【Example】
In the case where two types of cement are used as the grout material and the expansion material is not mixed, the water binder ratio and the age when the test kneading is performed with the water binder ratio being made as small as possible within the range that can be mixed on site. Table 1 shows the compressive strength in the day. In the case of cement 1, the water bonding material ratio of about 22% was the minimum, and the compressive strength of the grout material at that time was about 142 N / mm 2 . In the case of cement 2, the water binder ratio of about 16% was the minimum, and the compressive strength of the grout material at that time was about 115 N / mm 2 . In either case, the result was much higher than the compressive strength of 70 N / mm 2 of the conventional grout material.
[0009]
[Table 1]
Next, for rebar joints using a grout material in which an expansion material is mixed in cement 1, the Ministry of Construction, Sumitomo No. 31 (January 31, 1991) [Attachment 1-1] Rebar joint performance criteria Table 2 shows the results of the elastic region positive / negative repetition test shown in FIG. In Table 2, the class A joint standard means a joint that is almost the same as the base material in terms of strength and rigidity, but is slightly inferior to the base material in other respects. The rigidity reduction rate is a value obtained by dividing the secant rigidity of the joining rebar at the time of the 20th application by the dividing line rigidity of the joining rebar at the first application, and the slip amount is the value at the time of the 20th application. It is a slip deformation of the joining rebar. Note that the secant rigidity at this time is the secant rigidity of the joint reinforcing bar at a stress 0.95 times the standard yield point of the base material.
As a result, in the first week, when the expansion material was not mixed, the class A joint standard was not satisfied, but when the expansion material was mixed 5% or more, the result satisfying the class A joint standard was obtained. . In addition, when about 5% of the expansion material is mixed with respect to the cement amount, a measurement result is obtained that the volume strain of the grout material is about 5 × 10 4 μ to 1 × 10 5 μ at the age of 28 days.
[0011]
[Table 2]
【The invention's effect】
As described above, according to the reinforcing bar joint according to the present invention, since the lock nuts at both ends of the coupler are not required, a reinforcing bar joint capable of improving the construction efficiency can be realized.
[Brief description of the drawings]
FIG. 1 is an example of an embodiment of a reinforcing bar joint according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ...
Claims (2)
前記グラウト材に膨張材を混入し、前記螺合部の空隙への前記グラウト材充填後１週目における弾性域正負繰り返し試験での２０回目加力時の接合鉄筋の割線剛性を１回目の加力時の接合鉄筋の割線剛性で除した値が０．５より高く、しかも、２０回目の加力時の接合鉄筋のすべり変形量が０．３ｍｍ以下となるように、前記グラウト材の膨張によるカプラー内の体積歪を、前記カプラー内にケミカルプレストレスが導入可能な２０００μ以上とすることを特徴とする鉄筋継手。By inserting threaded joints from both ends of a substantially cylindrical coupler having a female thread formed on the inner periphery, and filling the grout material in the gap between the female thread of the coupler and the male thread of the threaded joint , A rebar joint that joins the screw joint rebar without using a lock nut,
An expansion material is mixed in the grout material, and the secant rigidity of the joining rebar at the 20th applied force in the elastic region positive / negative repetition test in the first week after filling the grout material in the gap of the threaded portion is applied for the first time. Due to the expansion of the grout material, the value divided by the secant rigidity of the joint rebar at the time of force is higher than 0.5, and the amount of slip deformation of the joint rebar at the time of the 20th force is 0.3 mm or less. A reinforcing bar joint having a volumetric strain in a coupler of 2000 μm or more at which chemical prestress can be introduced into the coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003195234A JP4439208B2 (en) | 2003-07-10 | 2003-07-10 | Rebar joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003195234A JP4439208B2 (en) | 2003-07-10 | 2003-07-10 | Rebar joint |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009190487A Division JP2009287387A (en) | 2009-08-19 | 2009-08-19 | Reinforcement joint |
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| Publication Number | Publication Date |
|---|---|
| JP2005030029A JP2005030029A (en) | 2005-02-03 |
| JP4439208B2 true JP4439208B2 (en) | 2010-03-24 |
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|---|---|---|---|
| JP2003195234A Expired - Lifetime JP4439208B2 (en) | 2003-07-10 | 2003-07-10 | Rebar joint |
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| JP (1) | JP4439208B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100731588B1 (en) * | 2005-03-11 | 2007-06-22 | 동방엔지니어링 주식회사 | Connecting method of reinforcing bar cage composed of threaded bar and its connector |
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- 2003-07-10 JP JP2003195234A patent/JP4439208B2/en not_active Expired - Lifetime
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| JP2005030029A (en) | 2005-02-03 |
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