JP4024170B2

JP4024170B2 - Fittings for threaded reinforcing bars

Info

Publication number: JP4024170B2
Application number: JP2003073706A
Authority: JP
Inventors: 正明阿瀬
Original assignee: Splice Sleeve Japan Ltd
Current assignee: Splice Sleeve Japan Ltd
Priority date: 2003-03-18
Filing date: 2003-03-18
Publication date: 2007-12-19
Anticipated expiration: 2023-03-18
Also published as: JP2004278219A

Description

【０００１】
【発明が属する技術分野】
この出願の発明は、鉄筋コンクリート造、或いは鉄骨鉄筋コンクリート造建築物において、鉄筋同士を突き合わせ接合するねじふし鉄筋用継手金具に関するものである。
【０００２】
【従来の技術】
従来のねじふし鉄筋用継手は、鉄筋のふしと継手のふしを噛み合わせ、主として鉄のせん断力に頼るメカニズムとなっていることから、製造する鉄筋の径・ふし高さ・ふしピッチに合わせて設計しており、芯ずれやピッチずれが生じると施工しにくいという問題点があった。
【０００３】
図５に示す継手金具は従来例で、グラウト材を使用するねじふし鉄筋用継手金具１１１により、ねじふし鉄筋１１２を突き合わせ接合するもので、内周面にねじ山１１３が、外周面中央にグラウト材の注入孔１１４が設けられ、軸方向両端からねじ込まれたねじふし鉄筋１１２を、注入孔１１４から内部に注入したグラウト材１１５を介して接続固定する方式である。
ねじふし鉄筋用継手金具１１１の内周面に設けたねじ山１１３は断面台形からなり、該継手金具にねじ込まれるねじふし鉄筋１１２のふしも同様な台形断面からなっており、ねじふし鉄筋用継手金具１１１にねじふし鉄筋１１２をねじ込んだときの隙間は小さく、グラウトの作業は容易でなかった。
【０００４】
また、接合する２つのねじふし鉄筋の先端のねじ山の位相が合致しなくても相互に近接させて接合することができ、また、接合する２つのねじふし鉄筋のピッチが多少異なっていてもねじ込んで接合することができるねじふし鉄筋用継手金具として、
内周面にねじ山を、外周面中央にグラウト材の注入孔を備え、軸方向両端からねじ込まれたねじふし鉄筋を前記グラウト材の注入孔から内部に充填したグラウト材により接続固定するねじふし鉄筋用継手であって、前記ねじ山の少なくともひっかかり高さ部分の幅を、両側の傾斜角はそのままにして山頂の幅がピッチの１５％以下となるように削減したねじふし鉄筋用継手金具がある。
しかし、このねじふし鉄筋用継手金具は、ねじ山を台形から三角形にしていることから、ピッチずれ等には対応できるが芯ずれに対しては対応することができなかった。
【０００５】
【発明が解決しようとする課題】
この出願の発明は、相対する鉄筋同士を突き合わせ接合するねじふし鉄筋用継手金具のねじ山を工夫することにより、ねじふし鉄筋の芯ずれやピッチずれが生じても接合することのできる、ねじふし鉄筋用継手金具を提供することを目的とするものである。
【０００６】
【課題を解決するための手段】
この出願の発明は、上記した課題を解決するため、ねじふし鉄筋用継手金具による鉄筋同士の突き合わせ接合を、鉄のせん断力に頼るメカニズムにモルタルによる付着力を加味することにより、これらの施工性を良くしたものである。
【０００７】
具体的構成の１は、ねじふし鉄筋同士を突き合わせ接合する両端に開口部を有する中空筒状のねじふし鉄筋用継手金具において、本体内周面の長手方向過半にわたり、所定の間隔毎に環状の小突起よりなる内部突起と、該小突起の突起高より高く、且つ螺合されるねじふし鉄筋のふしの高さより高く突設したねじ山を各々形成し、該ねじ山は上記環状の内部突起とクロスする方向で、且つその一部を切り欠いた形状の突起としてなるねじふし鉄筋用継手金具を特徴とするものである。
【０００８】
具体的構成の２は、中空筒状本体に、グラウト材の注入孔と排出孔を設けたねじふし鉄筋用継手金具を特徴とするものである。
【０００９】
具体的構成の３は、一部切り欠かれたねじ山は一方の開口部側である片側に設け、他方の開口部側はグラウト充填方式にしたねじふし鉄筋用継手金具を特徴とするものである。
【００１０】
具体的構成の４は、一部切り欠かれたねじ山は、両開口部側の一部に設けたねじふし鉄筋用継手金具を特徴とするものである。
【００１１】
具体的構成の５は、中空筒状本体に、鉄筋を仮固定する手段を設けたねじふし鉄筋用継手金具を特徴とするものである。
【００１２】
具体的構成の６は、中空筒状本体の外面形状を、円柱、角柱又は円錐形とし、更に、ヒレやリングによる補強手段を設けたねじふし鉄筋用継手金具を特徴とするものである。
【００１３】
【発明の実施の形態】
この出願の発明を、図面に示す実施例に基づいて説明する。
【００１４】
【実施例１】
図１ａは、ねじふし鉄筋用継手金具１の縦断面図、図１ｂは、図１ａにおける垂直断面図を示すもので、中空筒状本体２の内周面に、所定の間隔で環状の内部突起３が形成され、グラウト材の注入孔４および排出孔５が設けられている。
【００１５】
該環状からなる内部突起３の断面積は従来の継手より小さく、この内部突起３にクロスする形で、且つ、ねじふし鉄筋６のふし７の高さよりも高くなるようにして、中空筒状本体２の内周面にねじ山８が形成されている。
中空筒状本体２の内周面に形成されるねじ山８は、１個の投影面積が３６０度方向に設けられるものではなく、一部切り欠かれた形で形成されている。
【００１６】
図２は、ねじふし鉄筋用継手金具１を切断した内部斜視図を示すもので、中空筒状本体２の内周面に所定の間隔で環状の内部突起３が形成され、更に、該内部突起３とクロスする形で、且つ、内部突起３の高さよりも少し高くなるようにしてねじ山８が形成されている。
図１ｂの垂直断面図には、中空筒状本体２の内周面に、環状に設けた内部突起３の高さよりも少し高くしてねじ山８が設けられている鉄筋継手金具１が示されている。
【００１７】
図１ａに示すねじふし鉄筋用継手金具１は、一方の開口部側である片側内周面（図面では右半部）には、環状の内部突起３とねじ山８が形成され、他方の開口部側となる片側内周面（図面では左半部）には、環状の内部突起３だけを設けた、ねじふし鉄筋用継手とグラウト充填式継手から構成されたねじふし鉄筋用継手金具１（いわゆる「片筒式継手」）である。
【００１８】
この出願の発明は、例えば、鉄筋コンクリート梁の接合部における鉄筋の突き合わせ部にねじふし鉄筋用継手金具１を取り付け、該継手金具１の側壁に設けた注入孔４からグラウト材を注入し、排出孔５からグラウト材が溢れ出るのを確認することにより、グラウト材が完全に充填されたか否かを確認することができ、グラウト材の硬化により鉄筋同士が接合される。
グラウト材には、例えば、エポキシ樹脂、シリコーン樹脂、ポリエチレン樹脂、早強セメント等の無機材或いは有機材からなる材料が使用される。
【００１９】
施工性を良くするために、ねじふし鉄筋用継手金具１の両端近傍にボルト孔９を設け、該ボルト孔９にボルトを螺入することにより、該ねじふし鉄筋用継手金具１に挿入される鉄筋を安定した状態で固定することができ、グラウト材の注入作業を容易に行うことができる。
また、ねじふし鉄筋用継手金具１の鉄筋挿入口の外側にシール材を、例えば、螺着等の手段により装着することによりグラウト材の漏れを防ぐことができる。
【００２０】
【実施例２】
図３ａは、ねじふし鉄筋用継手金具１１の縦断面図、図３ｂは、図３ａにおける垂直断面図を示すもので、中空筒状本体２の内周面に、所定の間隔で環状の内部突起３が形成され、グラウト材の注入孔４および排出孔５が設けられいる。
【００２１】
環状からなる内部突起３の断面積は従来の継手より小さく、この内部突起３とクロスする形で、且つ、ねじふし鉄筋６のふし７の高さよりも高くなるようにして、中空筒状本体２の内周面にねじ山８が形成されている。
中空筒状本体２の内周面に形成されるねじ山８は、１個の投影面積が３６０度方向に設けられるものではなく、一部切り欠かれた形で成形されている。
【００２２】
図３ａのねじふし鉄筋用継手金具１１は、両開口部側から所定の範囲の内周面に、環状の内部突起３とねじ山８が形成されたねじふし継手により構成された鉄筋継手金具１１が示されている。
実施例１と同じように、例えば、鉄筋コンクリート梁の接合部における鉄筋の突き合わせ部にねじふし鉄筋用継手金具１１を取り付け、該継手金具１１の側壁に設けた注入孔４からグラウト材を注入し、グラウト材が硬化することにより鉄筋同士は接合される。
【００２３】
ねじふし鉄筋用継手金具１，１１を形成する中空筒状本体２の外面形状は、円柱・角柱・円錐形が好ましいが、これに限定されるものではない。
また、ねじふし鉄筋用継手金具１，１１を補強するため、中空筒状本体２の外周面に、ヒレやリングを設けても良い。
【００２４】
図４は、ねじふし鉄筋用継手金具１，１１の一方の開口部側（ねじふし鉄筋用継手金具の半部）にねじ込まれたねじふし鉄筋６とねじふし継手との関係を示す断面図である。
ねじふし鉄筋用継手金具１，１１の内周面と、ねじふし鉄筋６のねじ山８との間を大きくし、更に、中空筒状本体２のねじ山１個の投影面積が３６０度方向になく、一部切り欠かれた構造からなっている。
【００２５】
【発明の効果】
この出願の発明は、ねじふし鉄筋とねじふし継手との関係を、上記した構造にしたので、製造する鉄筋の径・ふし高さ・ふしピッチにより、芯ずれやピッチずれが生じても充分対応することができる。
また、中空筒状本体のねじ山は寸断されているが、ねじ山に近接して設けた環状の内部突起とグラウト材により接合が強化される。
更に、中空筒状本体の内周面及びねじ山と、ねじふし鉄筋のふし等との間隔を大きくしたことから、グラウト材の充填が容易になり、施工性が良い。
【図面の簡単な説明】
【図１】（ａ）ねじふし鉄筋用継手金具の縦断面図である。
（ｂ）ねじふし鉄筋用継手金具の垂直断面図である。
【図２】ねじふし鉄筋用継手金具を切断した内部斜視図である。
【図３】（ａ）ねじふし鉄筋用継手金具の縦断面図である。
（ｂ）ねじふし鉄筋用継手金具の垂直断面図である。
【図４】ねじふし鉄筋とねじふし継手との関係を示す断面図である
【図５】従来のねじふし鉄筋用継手金具による継手部を示す断面図である。
【符号の説明】
１・・・ねじふし鉄筋用継手金具
１１・・ねじふし鉄筋用継手金具
２・・・中空筒状本体
３・・・内部突起
４・・・注入孔
５・・・排出孔
６・・・グラウト材
７・・・ふし
８・・・ねじ山
９・・・ボルト孔
１１１・ねじふし鉄筋用継手金具
１１２・ねじふし鉄筋
１１３・ねじ山
１１４・注入孔
１１５・グラウト材[0001]
[Technical field to which the invention belongs]
The invention of this application relates to a joint metal fitting for a threaded reinforcing bar which joins and reinforces reinforcing bars in a reinforced concrete structure or a steel reinforced concrete structure building.
[0002]
[Prior art]
Conventional threaded joints for threaded rebars have a mechanism that relies mainly on the shearing force of the iron by engaging the rebars and the joints of the joints. There was a problem that it was difficult to perform the construction if there was misalignment or pitch deviation.
[0003]
The joint fitting shown in FIG. 5 is a conventional example, in which the threaded reinforcing bar 112 is butt-joined by a threaded reinforcing bar joint fitting 111 using a grout material, and a thread 113 is formed on the inner peripheral surface and a grout is formed in the center of the outer peripheral surface. This is a system in which a material injection hole 114 is provided, and screwed reinforcing bars 112 screwed from both ends in the axial direction are connected and fixed via a grout material 115 injected into the inside from the injection hole 114.
The thread 113 provided on the inner peripheral surface of the threaded reinforcing bar fitting 111 has a trapezoidal cross section, and the threaded reinforcing bar 112 screwed into the fitting has a similar trapezoidal cross section. When the screw rebar 112 was screwed into the metal fitting 111, the gap was small, and the grout operation was not easy.
[0004]
In addition, even if the phase of the screw thread at the tip of the two threaded reinforcing bars to be joined does not match, they can be joined close to each other, and even if the pitch of the two threaded reinforcing bars to be joined is slightly different As a fitting metal fitting for threaded rebar that can be joined by screwing,
A screw head that has a thread on the inner peripheral surface and a grout injection hole at the center of the outer peripheral surface, and that connects and fixes the screw reinforcing bars screwed from both ends in the axial direction with the grout material filled inside the injection hole of the grout material. There is provided a joint for a reinforcing bar for a threaded reinforcing bar in which the width of at least the hooked portion of the thread is reduced so that the width of the peak is 15% or less of the pitch with the inclination angle on both sides being left unchanged. is there.
However, since this threaded reinforcing bar joint fitting has a screw thread that changes from a trapezoid to a triangle, it can cope with pitch deviation and the like but cannot cope with misalignment.
[0005]
[Problems to be solved by the invention]
The invention of this application is based on the screw thread of the joint metal fittings for threaded reinforcement that butt-joins the opposing reinforcing bars, and can be joined even if there is misalignment or pitch deviation of the threaded reinforcement. An object of the present invention is to provide a joint fitting for a reinforcing bar.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention of this application is based on the workability of the butt joint between the reinforcing bars by using the screw fittings for threaded reinforcing bars by adding the adhesive force of mortar to the mechanism that relies on the shearing force of iron. It is what improved.
[0007]
1 of a specific configuration is Oite the hollow cylindrical Nejifu and reinforcing bar joint for fittings having openings at both ends for butt joining the Nejifushi rebar together over a longitudinal majority of the body peripheral surface, a predetermined interval an internal projection formed of an annular small projection to be higher than the projection height of the small projections, and threadedly Nejifu respectively to form a high projecting and Taneji mountain than the height of the distrust rebar are engaged, the thread The present invention is characterized in that the fitting metal fitting for a threaded reinforcing bar is formed as a projection having a shape in which a part thereof is cut out in a direction crossing the annular inner projection .
[0008]
The specific configuration 2 is characterized by a threaded reinforcing bar joint fitting in which a grout material injection hole and a discharge hole are provided in a hollow cylindrical main body.
[0009]
The specific configuration 3 is characterized in that a screw notch rebar fitting is provided on one side, which is one opening side, and the other opening side is a grout filling method. is there.
[0010]
The specific configuration 4 is characterized in that a threaded part with a notch is provided with a threaded reinforcing bar joint fitting provided at a part of both openings.
[0011]
A specific configuration 5 is characterized by a threaded reinforcing bar joint fitting provided with a means for temporarily fixing a reinforcing bar to a hollow cylindrical main body.
[0012]
A specific configuration 6 is characterized in that the outer shape of the hollow cylindrical main body is a cylinder, a prism, or a conical shape, and further, a fitting for a threaded reinforcing bar provided with reinforcing means such as fins or rings.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The invention of this application will be described based on the embodiments shown in the drawings.
[0014]
[Example 1]
FIG. 1a is a longitudinal sectional view of a threaded reinforcing bar joint fitting 1 and FIG. 1b is a vertical sectional view of FIG. 1a. On the inner peripheral surface of a hollow cylindrical main body 2, annular internal projections are formed at predetermined intervals. 3 is formed, and a grout material injection hole 4 and a discharge hole 5 are provided.
[0015]
The cross-sectional area of the annular inner projection 3 is smaller than that of the conventional joint, crosses the inner projection 3, and is higher than the height of the knot 7 of the threaded reinforcing bar 6, so that the hollow tubular body Threads 8 are formed on the inner peripheral surface of 2.
The thread 8 formed on the inner peripheral surface of the hollow cylindrical main body 2 is not provided with one projection area in the direction of 360 degrees, but is formed in a partially cut shape.
[0016]
FIG. 2 shows an internal perspective view of the threaded reinforcing bar joint fitting 1, in which annular internal protrusions 3 are formed at predetermined intervals on the inner peripheral surface of the hollow cylindrical main body 2. The thread 8 is formed so as to cross 3 and slightly higher than the height of the internal protrusion 3.
The vertical cross-sectional view of FIG. 1b shows a reinforced joint fitting 1 in which a thread 8 is provided on the inner peripheral surface of the hollow cylindrical body 2 slightly higher than the height of the annular inner projection 3. ing.
[0017]
In the joint metal fitting 1 for threaded reinforcing bar shown in FIG. 1a, an annular inner protrusion 3 and a thread 8 are formed on one inner peripheral surface (right half in the drawing) which is one opening side, and the other opening One side inner peripheral surface (the left half in the drawing), which is a part side, is provided with only a circular inner protrusion 3 and is provided with a threaded reinforcing bar joint and a grout-filled joint fitting 1 ( This is a so-called “single cylinder joint”.
[0018]
In the invention of this application, for example, a threaded reinforcing bar joint fitting 1 is attached to a butt portion of a reinforcing bar in a joint portion of a reinforced concrete beam, a grout material is injected from an injection hole 4 provided in a side wall of the joint fitting 1, and a discharge hole By confirming that the grout material overflows from 5, it can be confirmed whether or not the grout material is completely filled, and the reinforcing bars are joined together by hardening of the grout material.
As the grout material, for example, a material made of an inorganic material or an organic material such as an epoxy resin, a silicone resin, a polyethylene resin, or a high-strength cement is used.
[0019]
In order to improve workability, a bolt hole 9 is provided in the vicinity of both ends of the threaded reinforcing bar joint fitting 1, and the bolt is inserted into the bolt hole 9 to be inserted into the threaded reinforcing bar joint fitting 1. The reinforcing bars can be fixed in a stable state, and the grout material can be easily injected.
Moreover, leakage of the grout material can be prevented by attaching a sealing material to the outside of the reinforcing bar insertion port of the threaded reinforcing bar joint fitting 1 by means such as screwing.
[0020]
[Example 2]
3a is a longitudinal sectional view of the threaded reinforcing bar joint fitting 11, and FIG. 3b is a vertical sectional view in FIG. 3a. On the inner peripheral surface of the hollow cylindrical main body 2, annular internal protrusions are formed at predetermined intervals. 3 is formed, and a grout material injection hole 4 and a discharge hole 5 are provided.
[0021]
The cross-sectional area of the annular inner protrusion 3 is smaller than that of the conventional joint, crosses the inner protrusion 3, and is higher than the height of the upper end 7 of the threaded reinforcing bar 6. A thread 8 is formed on the inner peripheral surface of the screw.
The thread 8 formed on the inner peripheral surface of the hollow cylindrical main body 2 is not provided with one projected area in the 360 degree direction, but is formed in a partially cut shape.
[0022]
The joint metal fitting 11 for screw thread rebar shown in FIG. 3a is a reinforcing steel joint metal fitting 11 constituted by a thread finger joint in which an annular inner protrusion 3 and a thread 8 are formed on an inner peripheral surface within a predetermined range from both openings. It is shown.
As in Example 1, for example, the fitting metal fitting 11 for threaded rebar is attached to the butt portion of the reinforcing bar in the joint portion of the reinforced concrete beam, and the grout material is injected from the injection hole 4 provided in the side wall of the fitting metal 11, The reinforcing bars are joined together by the hardening of the grout material.
[0023]
The outer surface shape of the hollow cylindrical body 2 forming the threaded reinforcing bar joint fittings 1 and 11 is preferably a cylinder, a prism, or a cone, but is not limited thereto.
Further, fins and rings may be provided on the outer peripheral surface of the hollow cylindrical main body 2 in order to reinforce the threaded reinforcing bar joint fittings 1 and 11.
[0024]
FIG. 4 is a cross-sectional view showing the relationship between the threaded reinforcing bar 6 and the threaded joint, which is screwed into one opening side of the threaded reinforcing bar joint fittings 1 and 11 (half part of the threaded reinforcing bar joint fitting). is there.
The space between the inner peripheral surface of the threaded reinforcing bar joint fittings 1 and 11 and the thread 8 of the threaded reinforcing bar 6 is increased, and the projected area of one thread of the hollow tubular body 2 is in the direction of 360 degrees. It is not a part of the structure.
[0025]
【The invention's effect】
In the invention of this application, since the relationship between the threaded reinforcing bar and the threaded joint has the above-described structure, it can sufficiently cope with misalignment and pitch deviation due to the diameter, height and pitch of the reinforcing bar to be manufactured. can do.
Moreover, although the thread of the hollow cylindrical main body is cut off, the joining is strengthened by the annular internal protrusion and the grout material provided close to the thread.
Furthermore, since the space | interval of the inner peripheral surface and screw thread of a hollow cylindrical main body, the braid | blade rebar brace, etc. was enlarged, filling with grout material becomes easy and workability | operativity is good.
[Brief description of the drawings]
FIG. 1 (a) is a longitudinal cross-sectional view of a threaded reinforcing bar joint fitting.
(B) It is a vertical sectional view of the fitting metal fitting for screw thread reinforcement.
FIG. 2 is an internal perspective view of the threaded reinforcing bar joint fitting cut.
FIG. 3 (a) is a longitudinal sectional view of a threaded reinforcing bar joint fitting.
(B) It is a vertical sectional view of the fitting metal fitting for screw thread reinforcement.
FIG. 4 is a cross-sectional view showing a relationship between a threaded reinforcing bar and a threaded joint. FIG. 5 is a cross-sectional view showing a joint portion of a conventional fitting for a threaded reinforcing bar.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Joint metal fitting 11 for screw thread reinforcement .... Joint metal fitting 2 for screw thread reinforcement 2 ... Hollow cylindrical main body 3 ... Internal protrusion 4 ... Injection hole 5 ... Discharge hole 6 ... Grout Material 7 ... Fix 8 ... Thread 9 ... Bolt hole 111 / Screw fitting for screw rebar 112 / Screw rebar 113 / Thread 114 / Injection hole 115 / Grout material

Claims

Oite across the butt joining the Nejifushi rebar together a hollow cylindrical Nejifu and rebar for joint fitting having an opening over a longitudinal majority of the body peripheral surface, consisting of an annular small projection at predetermined intervals and internal projections, higher than the projection height of the small projections, and Nejifu screwed to form respectively higher projected to Taneji mountain than the height of the distrust rebar, the thread internal projection and the cross of the annular A fitting for a threaded reinforcing bar, characterized in that it is formed as a protrusion having a shape that is cut out in a direction to be cut .

A hollow cylindrical body, Nejifu and rebar for joint fitting according to claim 1, characterized by providing an injection hole 及 beauty discharge hole of the grout.

Screwing method by partially cut-away thread is provided from one of the opening-side side only it reaches the central portion, the other side to reach the central portion from the other opening side, joined by injection of grout 3. A screw fitting for a threaded reinforcing bar according to claim 1 or 2, characterized in that the filling method is free of threads .

Partially cut-away thread, reinforcing bar joint for fittings according to claim 1 or 2, characterized in that provided on both opening side.

A hollow cylindrical body, Nejifu and rebar for joint fittings Izu Re one of claims 1 to 4, characterized in that a means for temporarily fixing the reinforcing bar.

The outer surface shape of the hollow cylindrical body is a cylinder, Nejifu and rebar for joint fittings Izu Re one of claims 1 to 5, characterized in that as any form of prismatic or conical.