JP2011084897A - Screw-type reinforced joint for both fixed reinforcements, and reinforcement and joint set - Google Patents

Screw-type reinforced joint for both fixed reinforcements, and reinforcement and joint set Download PDF

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JP2011084897A
JP2011084897A JP2009237159A JP2009237159A JP2011084897A JP 2011084897 A JP2011084897 A JP 2011084897A JP 2009237159 A JP2009237159 A JP 2009237159A JP 2009237159 A JP2009237159 A JP 2009237159A JP 2011084897 A JP2011084897 A JP 2011084897A
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screw
joint
reinforcing bar
male
pair
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廣三 ▲脇▼山
Kozo Wakiyama
Akira Fukuda
章 福田
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Dai Ichi High Frequency Co Ltd
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Dai Ichi High Frequency Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint which enables the mutual connection of both reinforcements already fixed to concrete etc., and can obtain the advantages of excellent construction properties of a screw-type reinforced joint and a shortened construction period. <P>SOLUTION: A joint component set 2 for connecting male screws 1a and 1a formed at the opposed ends of the pair of reinforcements 1 and 1 is provided. The joint component set 2 comprises a pair of end-side screw cylinders 3 which are partially screwed to the male screw 1a of the reinforcement 1, an intermediate screw cylinder 4, and a pair of male screw components 5 and 5A which have both ends screwed to each of the end-side screw cylinder 3 and the intermediate screw cylinder 4. In the intermediate screw cylinder 4, a female screw 4a on one end side and a female screw 4b on the other end side are inversely threaded. Additionally, leads of both the female screws 4a and 4b and a lead of a female screw 3a of the end-side screw cylinder 3 are set different from each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、鉄筋コンクリートに用いられるねじ式鉄筋継手、特に、既にコンクリート等に双方とも固定された鉄筋を接続可能な双方固定鉄筋用ねじ式鉄筋継手、並びにこの鉄筋継手を含み大梁主筋等に用いられる鉄筋・継手セットに関する。   INDUSTRIAL APPLICABILITY The present invention is used for a threaded reinforcing bar joint used for reinforced concrete, in particular, a threaded reinforcing bar joint for both fixed reinforcing bars capable of connecting reinforcing bars already fixed to concrete or the like, and a main beam reinforcing bar including this reinforcing bar joint. Reinforcing bar and joint set.

鉄筋コンクリートにおいて、限られた標準長さの鉄筋を現場において連続な鉄筋とするために、各種の鉄筋継手が用いられる。鉄筋継手としては、鉄筋を所定の長さだけ重ねる重ね継手や、ガス圧接継手が一般的であるが、重ね継手は重なりによって配筋構造が煩雑となり、ガス圧接継手は圧接工の技量に継手の良否が左右されるという欠点がある。
そのため、特殊継手として、スリーブ内に鉄筋と共にグラウトを注入する継手が開発され、またねじ式継手が提案されている。スリーブ内にグラウトを注入する特殊継手は、配筋構造の簡略化の面で好ましく、実用化されているが、グラウトの硬化に、例えば１日程度の養生期間が必要になり、工期が長びくという欠点がある。 In reinforced concrete, various types of reinforcing bar joints are used in order to make a limited standard length reinforcing bar continuous in the field. As reinforced joints, lap joints and gas pressure welding joints in which reinforcing bars are stacked for a predetermined length are generally used. There is a drawback that the quality is affected.
Therefore, as a special joint, a joint for injecting grout with a reinforcing bar into the sleeve has been developed, and a threaded joint has been proposed. The special joint for injecting grout into the sleeve is preferable in terms of simplification of the bar arrangement structure, and has been put to practical use. However, a curing period of about one day is required for hardening the grout, and the construction period is long. There are drawbacks.

ねじ式継手は、グラウト注入式の特殊継手に必要となる養生期間が不要という利点があるが、まだ実用化に至っておらず、例えば特許文献１に示すものが提案されている。   The screw-type joint has the advantage that the curing period required for the grout-injection type special joint is unnecessary, but has not yet been put into practical use. For example, the one shown in Patent Document 1 has been proposed.

特開平１１−３３６２５６号公報JP-A-11-336256

鉄筋を接続する場合に、先に打設されたコンクリート等に既に双方とも固定された鉄筋を接続したい場合がある。このような場合、ねじ式鉄筋継手で接続しようとすると、両側の鉄筋の端部に設けられた雄ねじ部が、互いに同一の仮想ねじ面上にあることが必要である。片方の鉄筋の雄ねじ部のねじ面を延長した仮想ねじ面に対して、もう片方の鉄筋の雄ねじ部のねじ面が軸方向にずれていると、ねじ筒等を螺合させることができない。螺合可能とするには、長さ方向の位置調整だけでは不十分であり、雄ねじ部に対してねじ筒の雌ねじ部を螺合させるときの回転位相も一致していなければ、螺合させることができない。そのため、先に固定しておく鉄筋の雄ねじ部のねじ面を互いに一致させておくことは不可能である。
グラウト注入式の特殊継手では、このような問題は生じないが、上記のように養生期間がかかり、施工期間が長くなるという問題がある。 When connecting reinforcing bars, there are cases where it is desired to connect reinforcing bars already fixed to concrete or the like previously placed. In such a case, when it is going to connect with a screw-type reinforcing bar joint, it is necessary for the external thread part provided in the edge part of the reinforcing bar of both sides to be on the same virtual thread surface mutually. If the thread surface of the male threaded portion of the other reinforcing bar is displaced in the axial direction with respect to the virtual threaded surface obtained by extending the threaded surface of the male threaded portion of one reinforcing bar, the screw cylinder or the like cannot be screwed together. In order to enable screwing, it is not sufficient to adjust the position in the length direction. If the rotational phase when the female screw part of the screw cylinder is screwed with the male screw part does not match, screwing is performed. I can't. For this reason, it is impossible to match the thread surfaces of the male thread portions of the reinforcing bars that are fixed first.
Such a problem does not occur in the grout injection type special joint, but there is a problem that it takes a curing period as described above and the construction period becomes long.

ねじ式鉄筋継手において、既にコンクリート等に双方とも固定された鉄筋の相互の接続が可能になれば、施工性が飛躍的に向上するが、例えば、鉄筋コンクリート造建物の桁行方向の大梁主筋を考えた場合、全長が数十メートルと長くなり、またその梁の部位によっては鉄筋継手で接続してからコンクリートの打設が行える部分も生じる。このような箇所では簡易な構成で安価なねじ式鉄筋継手が望まれる。そのため、桁行方向の大梁主筋では、各種のねじ式鉄筋継手が必要となり、その準備が煩雑となる。   In threaded reinforcing steel joints, if rebars that are already fixed to concrete, etc., can be connected to each other, the workability will be dramatically improved. In this case, the total length is as long as several tens of meters, and some parts of the beam can be put into concrete after being connected with a reinforced joint. In such a place, an inexpensive screw-type reinforcing bar joint with a simple configuration is desired. For this reason, various threaded reinforcing bar joints are required for the main beam main beam in the direction of the beam, and the preparation becomes complicated.

この発明の目的は、既にコンクリート等に双方とも固定された鉄筋を相互に接続可能であり、かつねじ式鉄筋継手における優れた施工性、施工期間短縮の利点が得られる双方固定鉄筋用ねじ式鉄筋継手を提供することである。
この発明の他の目的は、鉄筋コンクリート造建物の桁行方向の大梁主筋等において、各部位に応じた各種のねじ式鉄筋継手および鉄筋をセットとして準備できて、鉄筋や継手等の資材準備の手間が簡易となる鉄筋・継手セットを提供することである。 The object of the present invention is to be able to connect rebars already fixed to both concrete and the like, and to obtain excellent workability in screw-type rebar joints and the advantage of shortening the construction period. It is to provide a joint.
Another object of the present invention is to prepare various screw-type reinforcing bar joints and reinforcing bars according to each part as a set in the main beam of the beam of a reinforced concrete building, etc. It is to provide a rebar / joint set that is simple.

この発明における第１の双方固定鉄筋用ねじ式鉄筋継手は、双方とも固定された一対の同心の鉄筋を接合可能とする双方固定鉄筋用ねじ式鉄筋継手であって、前記一対の鉄筋の対向端部を、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成し、両鉄筋の雄ねじ部間を接続する継手部品組を設ける。
この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対の端側ねじ筒と、これら端側ねじ筒の間に位置させる中間ねじ筒と、それぞれ各端側ねじ筒と中間ねじ筒とに両端が螺合する一対の雄ねじ部品とでなる。前記中間ねじ筒は、内周面に形成された一端側の雌ねじ部と他端側の雌ねじ部とを互いに逆ねじとし、かつ両雌ねじ部のリードを、端側ねじ筒の雌ねじ部のリードと互いに異ならせる。 The first threaded reinforcing bar joint for both fixed reinforcing bars according to the present invention is a threaded reinforcing bar joint for both fixed reinforcing bars capable of joining a pair of concentric reinforcing bars that are both fixed, and is opposed to the pair of reinforcing bars. The part is formed in a male thread part in which the groove bottom diameter of the thread groove is equal to or larger than the outer diameter of the general part, and a joint component set for connecting the male thread parts of both reinforcing bars is provided.
The joint component set includes a pair of end-side screw cylinders that are partially screwed into the male screw portions of the pair of reinforcing bars, an intermediate screw cylinder positioned between the end-side screw cylinders, and each end-side screw cylinder. And a pair of male screw parts whose both ends are screwed to the intermediate screw cylinder. The intermediate screw cylinder includes a female screw portion on one end side and a female screw portion on the other end side formed on the inner peripheral surface as reverse threads, and leads of both female screw portions are connected to leads of the female screw portion of the end screw cylinder. Make them different from each other.

この構成のねじ式鉄筋継手によると、両鉄筋の雄ねじ部間を接続する継手部品組が、一対の端側ねじ筒と、中間ねじ筒と、一対の雄ねじ部品とでなるため、各部品間のねじ込み深さを変えて継手部品組の長さを変えることができる。そのため、既にコンクリート等に固定された双方の鉄筋の間に継手部品組を配置することができる。その場合に、中間ねじ筒は一端側の雌ねじ部と他端側の雌ねじ部とを互いに逆ねじとしたため、中間ねじ筒を回転させることで、その両側にねじ込まれた一対の雄ねじ部品を伸縮させることができる。また、中間ねじ筒の雌ねじ部のリードを端側ねじ筒の雌ねじ部のリードと互いに異ならせたため、既に固定された片方の鉄筋の雄ねじ部のねじ面を延長した仮想ねじ面に対して、もう片方の鉄筋の雄ねじ部のねじ面が軸方向にずれていても、上記リードの違いのため、適宜回転させると、鉄筋の雄ねじ部に螺合した端側ねじ筒の雌ねじに対して、上記雄ねじ部材が螺合可能になる長さ方向位置および位相の関係となる箇所が生じる。そのため、ねじ式鉄筋継手でありながら、既にコンクリート等に双方とも固定された鉄筋を相互に接続することができる。また、ねじ式鉄筋継手であるため、グラウト注入式特殊継手のような養生期間が不要であり、施工期間が短縮できる。   According to the screw-type reinforcing bar joint of this configuration, the joint part set that connects the male threaded portions of both reinforcing bars is composed of a pair of end side threaded cylinders, an intermediate threaded cylinder, and a pair of male threaded parts. The length of the joint component set can be changed by changing the screwing depth. Therefore, a joint component set can be arranged between both reinforcing bars already fixed to concrete or the like. In that case, since the female threaded portion on one end and the female threaded portion on the other end of the intermediate threaded tube are reverse threads, rotating the intermediate threaded tube expands and contracts a pair of male threaded parts screwed on both sides thereof. be able to. In addition, since the lead of the female screw portion of the intermediate screw cylinder is made different from the lead of the female screw portion of the end screw cylinder, the lead of the male screw portion of one of the already fixed reinforcing bars is already extended. Even if the thread surface of the male thread part of one of the reinforcing bars is displaced in the axial direction, due to the difference in the lead, the male thread is compared with the female thread of the end side screw cylinder screwed into the male thread part of the reinforcing bar when rotated appropriately. The location which becomes the relationship of the length direction position and phase where a member can be screwed arises. Therefore, although it is a screw-type reinforcing bar joint, the reinforcing bars already fixed to both concrete and the like can be connected to each other. Moreover, since it is a screw-type reinforcing steel joint, the curing period like a grout injection type special joint is unnecessary, and a construction period can be shortened.

この発明における第２の双方固定鉄筋用ねじ式鉄筋継手は、双方とも固定された一対の同心の鉄筋を接合可能とする双方固定鉄筋用ねじ式鉄筋継手であって、前記一対の鉄筋の対向端部を、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成し、両鉄筋の雄ねじ部間を接続する継手部品組を設ける。この点は第１の双方固定鉄筋用ねじ式鉄筋継手と同じであるが、継手部品組を次の構成とする。
この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対の外周側ねじ筒と、それぞれ内外の周面が共にねじ面に形成されて前記各外周側ねじ筒の雌ねじ部における前記鉄筋の雄ねじ部が螺合する部分と反対側部分に螺合する一対の両面ねじ筒と、これら一対の両面ねじ筒の内周の雌ねじ部に両端が螺合した雄ねじ部品とでなり、前記両面ねじ筒は、外周側のねじ面である雄ねじ部と内周側のねじ面である雌ねじ部のリードを互いに異ならせる。 The second threaded reinforcing bar joint for both fixed reinforcing bars in the present invention is a threaded reinforcing bar joint for both fixed reinforcing bars that can join a pair of concentric reinforcing bars that are both fixed, and is opposed to the pair of reinforcing bars. The part is formed in a male thread part where the groove bottom diameter of the thread groove is equal to or larger than the outer diameter of the general part, and a joint component set for connecting the male thread parts of both reinforcing bars is provided. This point is the same as the first screw-type reinforcing bar joint for fixed reinforcing bars, but the joint component set has the following configuration.
The joint component set includes a pair of outer peripheral side screw cylinders that are partly screwed into the male threaded portions of the pair of reinforcing bars, and inner and outer peripheral surfaces that are both formed on a screw surface, and the female screw of each outer peripheral side screw cylinder. A pair of double-sided screw cylinders that are screwed to the opposite side of the part where the male screw part of the reinforcing bar is screwed, and a male screw part that is screwed at both ends to the female screw part on the inner periphery of the pair of double-sided screw cylinders. In the double-sided screw cylinder, the lead of the male screw portion which is the outer peripheral screw surface and the female screw portion which is the inner peripheral screw surface are different from each other.

この構成の場合、継手部品組が、各鉄筋の雄ねじ部に螺合する一対の外周側ねじ筒と、各外周側ねじ筒の雌ねじ部に螺合する一対の両面ねじ筒と、両面ねじ筒の内周の雌ねじ部に両端が螺合した雄ねじ部品とでなるため、これら外周側ねじ筒、両面ねじ筒、および雄ねじ部品の間でねじ込み深さの調整が行える。また、両面ねじ筒は、外・内の周面の雄ねじ部と雌ねじ部のリードを互いに異ならせたため、片方の外周側ねじ筒の雌ねじ部のねじ面を延長した仮想ねじ面に対して、もう片方の外周側ねじ筒の雌ねじ部ねじ面がずれていて、両面ねじ筒に対する雄ねじ部品のねじ込み深さの調整でそのずれを吸収できて、螺合による締め付け可能な位相関係を得ることができる。そのため、ねじ式鉄筋継手でありながら、既にコンクリート等に双方とも固定された鉄筋を相互に接続することができる。また、ねじ式鉄筋継手であるため、グラウト注入式特殊継手のような養生期間が不要であり、施工期間が短縮できる。   In the case of this configuration, the joint component set includes a pair of outer screw cylinders that are screwed into the male screw portions of the respective reinforcing bars, a pair of double screw cylinders that are screwed into the female screw portions of the outer screw cylinders, and a double screw screw cylinder. Since it consists of a male thread part screwed into both ends of the inner thread part, the screwing depth can be adjusted among these outer thread cylinder, double-sided thread cylinder, and male thread part. In addition, the double-sided screw cylinder is different from the virtual thread surface in which the thread surface of the female thread portion of one outer peripheral side is extended because the lead of the male thread portion and the female thread portion on the outer and inner circumferential surfaces are different from each other. The thread surface of the female thread portion of one of the outer peripheral side screw cylinders is deviated, and the deviation can be absorbed by adjusting the screwing depth of the male screw part with respect to the double-sided screw cylinder, and a phase relationship capable of being tightened by screwing can be obtained. Therefore, although it is a screw-type reinforcing bar joint, the reinforcing bars already fixed to both concrete and the like can be connected to each other. Moreover, since it is a screw-type reinforcing steel joint, the curing period like a grout injection type special joint is unnecessary, and a construction period can be shortened.

この発明の鉄筋・継手セットは、この発明の上記双方固定鉄筋用ねじ式鉄筋継手を用いてものである。すなわち、この鉄筋・継手セットは、互いに同心に接続される４本以上の鉄筋と、隣合う鉄筋同士をそれぞれ接続する３つ以上のねじ式鉄筋継手とからなり、前記各鉄筋は、前記鉄筋継手で接続される端部が、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成され、前記ねじ式鉄筋継手として、標準ねじ式鉄筋継手と、長さ調整ねじ式鉄筋継手と、双方固定鉄筋用ねじ式鉄筋継手とを設ける。
前記標準ねじ式鉄筋継手は、一対の鉄筋の対向端部の雄ねじ部に両端が螺合するねじ筒を設けたものである。前記長さ調整ねじ式鉄筋継手は、一対の鉄筋の対向端部の雄ねじ部間を接続する継手部品組を設け、この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対のねじ筒と、これら両ねじ筒に両端が螺合する調整用雄ねじ部品とでなる。前記双方固定鉄筋用ねじ式鉄筋継手は請求項１または請求項２記載の双方固定鉄筋用ねじ式鉄筋継手とする。 The reinforcing bar / joint set of the present invention uses the above-described screw-type reinforcing bar joint for both fixed reinforcing bars of the present invention. That is, the reinforcing bar / joint set includes four or more reinforcing bars that are concentrically connected to each other and three or more screw-type reinforcing bar joints that connect adjacent reinforcing bars to each other. Are connected to the standard threaded rebar joint as the threaded rebar joint, and the length of the threaded groove is the same as the outer diameter of the general part. An adjusting screw type reinforcing steel joint and a screw type reinforcing steel joint for both fixed reinforcing bars are provided.
The standard screw-type reinforcing bar joint is provided with a screw tube whose both ends are screwed into male screw portions at opposite ends of a pair of reinforcing bars. The length-adjustable screw-type reinforcing bar joint is provided with a joint part set for connecting between male threaded parts at opposite ends of a pair of reinforcing bars, and the joint part set is partially threadedly engaged with the male threaded part of the pair of reinforcing bars. And a male screw part for adjustment whose both ends are screwed to the two screw cylinders. The screw-type reinforcing bar joint for double-fixed reinforcing bars is the screw-type reinforcing bar joint for double-fixed reinforcing bars according to claim 1 or 2.

この構成によると、双方固定鉄筋用ねじ式鉄筋継手を用いた箇所では、互いに接続する鉄筋が既にコンクリート等に双方とも固定されていても接続することができる。長さ調整ねじ式鉄筋継手を用いた箇所では、調整用雄ねじ部品を任意の長さに切断して長さを変えたり、ねじ込み深さを変えることで、互いに接続する鉄筋間の長さの調整が行える。標準ねじ式鉄筋継手を用いた箇所では、簡易な構成で安価なねじ式鉄筋継手により接続が行える。鉄筋コンクリート造建物の桁行方向の梁主筋などでは、その総長が例えば数十メートルと非常に長く、また鉄筋コンクリート柱が先に打設された状態で、その中を通る鉄筋を接続する箇所や、建物毎の長さの違いに対応させる必要が生じたりするが、これらの要望に対して、双方固定鉄筋用ねじ式鉄筋継手や長さ調整ねじ式鉄筋継手で対応することができる。接続後に固定すれば良い鉄筋に対しては、標準ねじ式鉄筋継手で対応できる。これらの標準ねじ式鉄筋継手、長さ調整ねじ式鉄筋継手、双方固定鉄筋用ねじ式鉄筋継手と、雄ねじ部を有する鉄筋とがセットとして準備されるため、鉄筋や継手等の資材準備を簡易に行うことができる。   According to this structure, in the location using the screw type reinforcing bar joint for both fixed reinforcing bars, the reinforcing bars to be connected to each other can be connected even if both are already fixed to the concrete or the like. At locations using length-adjustable threaded steel joints, adjust the length between the reinforcing bars to be connected to each other by cutting the male thread for adjustment to an arbitrary length and changing the length or changing the screwing depth. Can be done. In places where standard threaded steel rebar joints are used, connection can be made with an inexpensive threaded steel rebar joint with a simple configuration. The main beam length of reinforced concrete buildings, such as the beam direction, is very long, for example, several tens of meters, and the reinforced concrete columns are placed in the first place. However, it is possible to cope with these demands by using a threaded reinforcing bar joint for fixed reinforcing bars or a thread adjusting joint for length adjusting screws. Reinforcing bars that need only be fixed after connection can be handled with standard threaded reinforcing bar joints. These standard threaded rebar joints, length-adjustable threaded rebar joints, both threaded rebar joints for fixed rebars, and rebars with male threads are prepared as a set, making it easy to prepare materials for rebars and joints. It can be carried out.

この発明の鉄筋・継手セットにおいて、鉄筋配列の端部に配置される両鉄筋における非接続側の端部が、一般部よりも拡径した定着力付与用の拡径頭部であっても良い。
鉄筋端部の定着部を、長く折り曲げたものとする場合に比べて、拡径頭部とした場合は配筋がすっきりとして簡素になる。拡径頭部の形成には工場での加工段階が必要となるが、同じく工場での加工が必要となるねじ式鉄筋継手用の雄ねじ部を有する鉄筋では、工場での加工が合理的に行え、拡径頭部の工場加工の手間に比べ、拡径頭部による現場での配筋の簡素化の利点の影響が大きい。これにより、鉄筋の継手部から鉄筋端部の定着部に渡って、施工性に優れたものとできる。 In the reinforcing bar / joint set of the present invention, the unconnected end of both reinforcing bars arranged at the end of the reinforcing bar array may be a diameter-enlarged head for fixing force that has a larger diameter than the general part. .
Compared with the case where the fixing portion at the end of the reinforcing bar is bent long, the arrangement of the enlarged diameter head is neat and simple. Forming an expanded head requires a factory processing stage, but rebars with male threads for threaded rebar joints that also require factory processing can reasonably be processed at the factory. Compared with the labor required for factory processing of the enlarged head, the effect of simplification of the bar arrangement at the site by the enlarged head is large. Thereby, it can be made excellent in workability from the joint part of a reinforcing bar to the fixing part of the reinforcing bar end.

拡径頭部とする場合に、鉄筋の端部に設けられた雄ねじ部に、拡径頭部形成部品を、この部品の有する雌ねじ部で螺合したものとしても良い。この場合、いずれの鉄筋も両端が雄ねじ部を有するものとして準備すれば良く、生産性により優れる。鉄筋継手用の雄ねじ部と拡径頭部用の雄ねじ部とを同じ仕様に統一すれば、より生産性に優れたものとなる。   In the case of an enlarged head, the enlarged head forming component may be screwed to the external thread provided at the end of the reinforcing bar with the internal thread of the component. In this case, all the reinforcing bars may be prepared as having both ends having male screw portions, which is more excellent in productivity. If the male thread part for the reinforcing bar joint and the male thread part for the enlarged head are unified with the same specifications, the productivity will be further improved.

この発明の第１の双方固定鉄筋用ねじ式鉄筋継手は、双方とも固定された一対の同心の鉄筋を接合可能とする双方固定鉄筋用ねじ式鉄筋継手であって、前記一対の鉄筋の対向端部を、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成し、両鉄筋の雄ねじ部間を接続する継手部品組を設け、この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対の端側ねじ筒と、これら端側ねじ筒の間に位置させる中間ねじ筒と、それぞれ各端側ねじ筒と中間ねじ筒とに両端が螺合する一対の雄ねじ部品とでなり、前記中間ねじ筒は、内周面に形成された一端側の雌ねじ部と他端側の雌ねじ部とを互いに逆ねじとし、かつ両雌ねじ部のリードを、端側ねじ筒の雌ねじ部のリードと互いに異ならせたため、ねじ式鉄筋継手でありながら、既にコンクリート等に双方とも固定された鉄筋を相互に接続可能となり、またねじ式鉄筋継手における優れた施工性、施工期間短縮の利点が得られる。   A first screw-type reinforcing bar joint for both fixed reinforcing bars according to the present invention is a screw-type reinforcing bar joint for both-fixed reinforcing bars capable of joining a pair of concentric reinforcing bars, both of which are fixed to each other. Part is formed in a male thread part where the groove bottom diameter of the thread groove is equal to or greater than the outer diameter of the general part, and a joint part set for connecting the male thread parts of both reinforcing bars is provided. A pair of end-side screw cylinders partially screwed into the male screw portions of the pair of reinforcing bars, an intermediate screw cylinder positioned between the end-side screw cylinders, and an end-side screw cylinder and an intermediate screw cylinder, respectively. The intermediate screw cylinder has a female screw portion on one end side and a female screw portion on the other end side formed on the inner peripheral surface as mutually reverse screws, and both the female screw portions Since the lead is different from the lead of the female thread part of the end screw cylinder, Yet joint, both will be connected to fixed rebar together, also excellent workability in threaded rebar joint, the advantages of construction period shortened obtained already concrete or the like.

この発明の第２の双方固定鉄筋用ねじ式鉄筋継手は、双方とも固定された一対の同心の鉄筋を接合可能とする双方固定鉄筋用ねじ式鉄筋継手であって、前記一対の鉄筋の対向端部を、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成し、両鉄筋の雄ねじ部間を接続する継手部品組を設け、この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対の外周側ねじ筒と、それぞれ内外の周面が共にねじ面に形成されて前記各外周側ねじ筒の雌ねじ部における前記鉄筋の雄ねじ部が螺合する部分と反対側部分に螺合する一対の両面ねじ筒と、これら一対の両面ねじ筒の内周の雌ねじ部に両端が螺合した雄ねじ部品とでなり、前記両面ねじ筒は、外周側のねじ面である雄ねじ部と内周側のねじ面である雌ねじ部のリードを互いに異ならせたため、ねじ式鉄筋継手でありながら、既にコンクリート等に双方とも固定された鉄筋を相互に接続可能となり、またねじ式鉄筋継手における優れた施工性、施工期間短縮の利点が得られる。   A second screw-type reinforcing bar joint for both fixed reinforcing bars of the present invention is a screw-type reinforcing bar joint for both-fixed reinforcing bars capable of joining a pair of concentric reinforcing bars that are both fixed, and the opposite ends of the pair of reinforcing bars. Part is formed in a male thread part where the groove bottom diameter of the thread groove is equal to or greater than the outer diameter of the general part, and a joint part set for connecting the male thread parts of both reinforcing bars is provided. A pair of outer peripheral side screw cylinders, each part of which is screwed into the male screw part of the pair of reinforcing bars, and an inner and outer peripheral surface are both formed on the screw surface, and the male screw of the reinforcing bar in the female screw part of each outer peripheral side screw cylinder A pair of double-sided screw cylinders that are screwed to a part opposite to the part to which the part is screwed, and a male screw part that is screwed at both ends to the internal threaded part of the inner periphery of the pair of double-sided screw cylinders. , Male screw part that is the outer thread surface and female thread that is the inner thread surface Because the lead of each part is different from each other, it is possible to connect rebars already fixed to concrete etc. even though it is a screw-type rebar joint. Is obtained.

この発明の鉄筋・継手セットは、互いに同心に接続される４本以上の鉄筋と、隣合う鉄筋同士をそれぞれ接続する３つ以上のねじ式鉄筋継手とからなり、前記各鉄筋は、前記鉄筋継手で接続される端部が、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成され、前記ねじ式鉄筋継手として、標準ねじ式鉄筋継手と、長さ調整ねじ式鉄筋継手と、双方固定鉄筋用ねじ式鉄筋継手とを設け、前記標準ねじ式鉄筋継手は、一対の鉄筋の対向端部の雄ねじ部に両端が螺合するねじ筒を設けたものであり、前記長さ調整ねじ式鉄筋継手は、一対の鉄筋の対向端部の雄ねじ部間を接続する継手部品組を設け、この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対のねじ筒と、これら両ねじ筒に両端が螺合する調整用雄ねじ部品とでなり、前記双方固定鉄筋用ねじ式鉄筋継手にはこの発明の上記構成の双方固定鉄筋用ねじ式鉄筋継手を用いたため、鉄筋コンクリート造建物の桁行方向の大梁主筋等において、各部位に応じた各種のねじ式鉄筋継手および鉄筋をセットとして準備できて、鉄筋や継手等の資材準備の手間が簡易となり、また上記双方固定鉄筋用ねじ式鉄筋継手による既にコンクリート等に双方とも固定された鉄筋を相互に接続可能であって、施工性向上、施工期間短縮等の効果を得ることができる。   The reinforcing bar / joint set according to the present invention includes four or more reinforcing bars that are concentrically connected to each other and three or more screw-type reinforcing bar joints that connect adjacent reinforcing bars to each other. Are connected to the standard threaded rebar joint as the threaded rebar joint, and the length of the threaded groove is the same as the outer diameter of the general part. An adjustment screw type reinforcing bar joint and a screw type reinforcing bar joint for both fixed reinforcing bars are provided, and the standard screw type reinforcing bar joint is provided with a threaded cylinder in which both ends are screwed into male threaded portions at opposite ends of a pair of reinforcing bars. The length-adjusting screw-type reinforcing bar joint is provided with a joint part set for connecting between the male threaded portions of the opposing ends of the pair of reinforcing bars, each part of the joint part set being connected to the male threaded part of the pair of reinforcing bars. A pair of screw cylinders to be screwed together, and both ends screwed to these screw cylinders Since the screw-type reinforcing bar joint for double-fixed reinforcing bars of the above-described configuration of the present invention is used as the screw-type reinforcing bar joint for double-fixed reinforcing bars, the main-bar parts in the beam direction of reinforced concrete buildings, etc. Various threaded rebar joints and rebars can be prepared as a set according to the site, making it easy to prepare materials for rebars and joints, etc., and both are already fixed to concrete etc. with the above-mentioned threaded rebar joints for both fixed rebars Reinforced bars can be connected to each other, and effects such as improvement of workability and shortening of the work period can be obtained.

この発明の第１の実施形態における双方固定鉄筋用ねじ式鉄筋継手の断面図である。It is sectional drawing of the screw-type reinforcing bar joint for both fixed reinforcing bars in 1st Embodiment of this invention. 同ねじ式鉄筋継手の分解状態の断面図である。It is sectional drawing of the decomposition | disassembly state of the screw-type reinforcement joint. 同ねじ式鉄筋継手の連結過程の説明図である。It is explanatory drawing of the connection process of the screw-type rebar joint. （Ａ），（Ｂ）はそれぞれ同双方固定鉄筋用ねじ式鉄筋継手におけるねじ筒の横断面図である。(A), (B) is a cross-sectional view of the screw cylinder in the screw type reinforcing bar joint for both fixed reinforcing bars. 同双方固定鉄筋用ねじ式鉄筋継手における鉄筋端部の雄ねじ部付近を示す変形例の側面図である。It is a side view of the modification which shows the external thread part vicinity of the reinforcing bar end part in the screw type reinforcing steel joint for both fixed reinforcing bars. この発明の第２の実施形態における双方固定鉄筋用ねじ式鉄筋継手の断面図である。It is sectional drawing of the screw-type reinforcing bar joint for both fixed reinforcing bars in 2nd Embodiment of this invention. 同ねじ式鉄筋継手の分解状態の断面図である。It is sectional drawing of the decomposition | disassembly state of the screw-type reinforcement joint. 同ねじ式鉄筋継手の連結過程の説明図である。It is explanatory drawing of the connection process of the screw-type rebar joint. この発明の一実施形態に係る鉄筋・継手セットの概念構成を示す説明図である。It is explanatory drawing which shows the conceptual structure of the reinforcing bar and joint set which concerns on one Embodiment of this invention. 同鉄筋・継手セットを用いた鉄筋コンクリート造建物の柱・梁の配筋構造造を示す正面図である。It is a front view which shows the reinforcement structure of the column and the beam of the reinforced concrete building using the same reinforcement and joint set. 同鉄筋・継手セットの標準ねじ式鉄筋継手の断面図である。It is sectional drawing of the standard screw type reinforcing bar joint of the same reinforcing bar and joint set. 同鉄筋・継手セットの長さ調整ねじ式鉄筋継手の断面図である。It is sectional drawing of the length adjustment screw-type reinforcing bar joint of the same reinforcing bar and joint set. 同鉄筋・継手セットの端部の鉄筋における拡径頭部を示す拡大破断側面図である。It is an expanded fracture side view which shows the diameter expansion head in the reinforcing bar of the edge part of the same reinforcing bar and joint set. 同拡径頭部を構成する拡径頭部形成部品の各例を示す正面図である。It is a front view which shows each example of the enlarged diameter head formation component which comprises the enlarged diameter head. 同鉄筋・継手セットの端部の鉄筋における拡径頭部の変形例を示す側面図である。It is a side view which shows the modification of the enlarged diameter head in the reinforcing bar of the edge part of the same reinforcing bar and joint set.

この発明の第１の実施形態に係る双方固定鉄筋用ねじ式鉄筋継手を、図１ないし図４と共に説明する。この双方固定鉄筋用ねじ式鉄筋継手１０A は、同心に配置されて互いに接続される一対の鉄筋１，１の対向端部を雄ねじ部１ａ，１ａに形成し、両鉄筋１，１の雄ねじ部１ａ，１ａ間を接続する継手部品組２を設けたものである。前記一対の鉄筋１，１は、継手部品組２による接続作業時には、既に鉄筋コンクリート（図示せず）内に固定され、コンクリート面から端部が突出するものである。上記鉄筋コンクリートは、プレキャストコンクリートであっても、現場打ちコンクリートであっても良い。
継手部品組２は、前記一対の鉄筋１，１の雄ねじ部１ａ，１ａにそれぞれ一部が螺合する一対の端側ねじ筒３，３と、これら端側ねじ筒３，３の間に位置させる中間ねじ筒４と、それぞれ各端側ねじ筒３と中間ねじ筒４とに両端が螺合する一対の雄ねじ部品５，５Ａとでなる。 A threaded reinforcing bar joint for double fixed reinforcing bars according to a first embodiment of the present invention will be described with reference to FIGS. In this threaded reinforcing bar joint 10A for both fixed reinforcing bars, opposite ends of a pair of reinforcing bars 1 and 1 arranged concentrically and connected to each other are formed in male threaded parts 1a and 1a, and the male threaded part 1a of both reinforcing bars 1 and 1 is formed. , 1a is provided with a joint component set 2. The pair of rebars 1 and 1 are already fixed in reinforced concrete (not shown) at the time of connection work by the joint component set 2, and end portions protrude from the concrete surface. The reinforced concrete may be precast concrete or in-situ concrete.
The joint component set 2 is positioned between a pair of end-side screw cylinders 3 and 3 that are partly engaged with the male screw portions 1a and 1a of the pair of reinforcing bars 1 and 1, and the end-side screw cylinders 3 and 3, respectively. And a pair of male screw parts 5 and 5A whose both ends are screwed to the respective end side screw cylinders 3 and the intermediate screw cylinders 4 respectively.

鉄筋１の雄ねじ部１ａは、ねじ溝の溝底径ｄ2 （図２）が鉄筋１の一般部分の外径ｄ1 に対して同径以上とする。鉄筋１は、例えば図５に示すような半円状突条１ｃおよび軸方向突条１ｄなどの突出部分を有する異形鉄筋であっても良い。その場合、雄ねじ部１ａは、溝底径が鉄筋１の上記各突条１ｃ，１ｄを除く部分の外径ｄ1 に対して同等以上であれば良いが、同図の例のように、突条１ｂ，１ｃを含む外径に対して同等以上とすることが好ましい。鉄筋１の雄ねじ部１ａのピッチ円直径は、他に支障が生じない範囲で大きくすることが好ましい。   The external thread 1a of the reinforcing bar 1 has a groove bottom diameter d2 (FIG. 2) equal to or larger than the outer diameter d1 of the general part of the reinforcing bar 1. The reinforcing bar 1 may be a deformed reinforcing bar having projecting portions such as a semicircular protrusion 1c and an axial protrusion 1d as shown in FIG. In that case, the male thread portion 1a may have a groove bottom diameter equal to or greater than the outer diameter d1 of the portion of the reinforcing bar 1 excluding the protrusions 1c and 1d, but as shown in the example of FIG. It is preferable to be equal to or greater than the outer diameter including 1b and 1c. It is preferable to increase the pitch circle diameter of the external thread portion 1a of the reinforcing bar 1 as long as no other trouble occurs.

鉄筋１に、このような太径の雄ねじ部１ａを設ける構成としては、例えば次の２種類の構成が採用できる。その一つは、鉄筋１の端部に、高周波誘導加熱を行いながら圧縮力を与えることで太径部を形成し、その太径部にねじ切り加工を施すことで、太径の雄ねじ部１ａとする構成である。他の一つは、鉄筋１と別体で鉄筋１よりも大径の雄ねじ部材を鉄筋１の端面に圧接等で接合することで、太径の雄ねじ部１ａとする構成である。   For example, the following two types of configurations can be adopted as the configuration in which the large-diameter male screw portion 1a is provided in the reinforcing bar 1. One of them is to form a large-diameter portion by applying a compression force to the end of the reinforcing bar 1 while performing high-frequency induction heating, and by threading the large-diameter portion, the large-diameter male screw portion 1a It is the structure to do. The other is a configuration in which a male screw member 1a having a large diameter is formed by joining a male screw member that is separate from the reinforcing bar 1 and has a diameter larger than that of the reinforcing bar 1 to the end surface of the reinforcing bar 1 by pressure welding or the like.

端側ねじ筒３は、鋼製のスリーブの内周面に、全長に渡って一様な雌ねじ部３ａを、ねじ切り加工で形成したものである。雌ねじ部３ａは、鉄筋１の雄ねじ部１ａが螺合する内径、リード、およびねじ溝断面形状のものである。   The end-side screw cylinder 3 is formed by threading a female thread portion 3a that is uniform over the entire length on the inner peripheral surface of a steel sleeve. The internal thread portion 3a has an inner diameter, a lead, and a thread groove cross-sectional shape into which the external thread portion 1a of the reinforcing bar 1 is screwed.

中間ねじ筒４は、鋼製のスリーブの内周面における中央に対する両側に、一対の雌ねじ部４ａ，４ｂを形成したものである。両雌ねじ部４ａ，４ｂは、互いに逆ねじとする。この例では、図の右側の雌ねじ部４ａを、端側ねじ筒３と同じねじ溝方向となる順ねじとし、図の左側の雌ねじ部４ｂを逆ねじとしている。両雌ねじ部４ａ，４ｂのリードは、互いに同じであるが、これら雌ねじ部４ａ，４ｂのリードを、端側ねじ筒３の雌ねじ部３ａのリードに対して異ならせてある。この例では、中間ねじ筒４の雌ねじ部４ａ，４ｂのリードの方を、端側ねじ筒３の雌ねじ部３ａのリードよりも小さくている。これとは逆に、中間ねじ筒４の雌ねじ部４ａ，４ｂの方のリードを大きくしても良い。   The intermediate screw cylinder 4 is formed by forming a pair of female screw portions 4a and 4b on both sides of the inner peripheral surface of the steel sleeve with respect to the center. Both female screw parts 4a and 4b are mutually reverse screws. In this example, the female screw portion 4a on the right side of the drawing is a forward screw in the same screw groove direction as the end side screw cylinder 3, and the female screw portion 4b on the left side of the drawing is a reverse screw. The leads of the female screw parts 4a and 4b are the same as each other, but the leads of the female screw parts 4a and 4b are different from the lead of the female screw part 3a of the end side screw cylinder 3. In this example, the lead of the female screw parts 4 a and 4 b of the intermediate screw cylinder 4 is made smaller than the lead of the female screw part 3 a of the end side screw cylinder 3. On the contrary, the lead of the female screw portions 4a and 4b of the intermediate screw cylinder 4 may be enlarged.

端側ねじ筒３および中間ねじ筒４の外周面の横断面形状は、例えば図４（Ａ）のような円形であっても、同図（Ｂ）のような８角形あるいは６角形等の多角形状であっても良い。多角形状であると、レンチ等の工具により回転させ易い。端側ねじ筒３および中間ねじ筒４の外周面の軸方向に沿う断面形状は、例えば、両端が次第に小径となるテーパ形状であっても良く、また長さ方向の中央が厚肉となったものであっても良い。両端が次第に小径となるテーパ形状であれば、引っ張り力の負荷に対して、両端の第１周のねじ山部分に応力集中することが回避できる。また、端側ねじ筒３および中間ねじ筒４に作用する引っ張り力は、これらねじ筒３，４の長さ方向の中央で最も大きく作用するため、中央部分が厚肉であることが、強度面から好ましい。
なお、端側ねじ筒３および中間ねじ筒４の素材となるスリーブ（図示せず）は、厚肉の鋼管をねじ筒長さ毎に寸断したものであっても、また一般的な肉厚の鋼管を、圧縮力を付与しながら誘導加熱する増肉加工で増肉し、その増肉鋼管を寸断したものであっても良い。 The cross-sectional shape of the outer peripheral surface of the end side screw cylinder 3 and the intermediate screw cylinder 4 may be a polygon such as an octagon or a hexagon as shown in FIG. It may be a shape. It is easy to rotate with tools, such as a wrench, if it is a polygonal shape. The cross-sectional shape along the axial direction of the outer peripheral surfaces of the end side screw cylinder 3 and the intermediate screw cylinder 4 may be, for example, a tapered shape in which both ends are gradually reduced in diameter, and the center in the length direction is thick. It may be a thing. If the both ends have a tapered shape with a gradually decreasing diameter, it is possible to avoid stress concentration on the thread portion of the first circumference at both ends with respect to the load of the pulling force. Further, the tensile force acting on the end-side screw cylinder 3 and the intermediate screw cylinder 4 is the largest at the center in the length direction of these screw cylinders 3, 4, so that the central portion is thick. To preferred.
In addition, the sleeve (not shown) used as the material of the end side screw cylinder 3 and the intermediate screw cylinder 4 may be formed by cutting a thick steel pipe for each screw cylinder length, The steel pipe may be thickened by a thickening process where induction heating is performed while applying a compressive force, and the thickened steel pipe may be cut off.

片方（図の右側）の雄ねじ部品５は、端側ねじ筒３の雌ねじ部３ａに螺合する雄ねじ部５ａと中間ねじ筒４の片方の雌ねじ部４ａに螺合する雄ねじ部５ａ，５ｂを、軸方向の略中央に対する両側にそれぞれ設けた鋼棒等の部品である。これら雄ねじ部５ａ，５ｂのねじ溝方向は、いずれも順ねじ方向としてあるが、そのリードは、端側ねじ筒３の雌ねじ部３ａリードと中間ねじ筒４の雌ねじ部４ａのリードにそれぞれ合わせて、互いに異ならせてある。   The male screw part 5 on one side (right side in the figure) includes a male screw part 5a that is screwed into the female screw part 3a of the end side screw cylinder 3 and male screw parts 5a and 5b that are screwed into one female screw part 4a of the intermediate screw cylinder 4. These are parts such as steel bars provided on both sides of the approximate center in the axial direction. The thread groove directions of these male screw portions 5a and 5b are both forward screw directions, but the lead is aligned with the lead of the female screw portion 3a of the end side screw tube 3 and the lead of the female screw portion 4a of the intermediate screw tube 4, respectively. Are different from each other.

もう片方（図の左側）の雄ねじ部品５Ａは、端側ねじ筒３の雌ねじ部３ａに螺合する雄ねじ部５ａと中間ねじ筒４のもう片方の雌ねじ部４ｂに螺合する雄ねじ部５Ａａ，５Ａｂを、軸方向の略中央に対する両側にそれぞれ設けた鋼棒等の部品である。端側ねじ筒３に対する雄ねじ部５Ａａは順ねじとしてあるが、中間ねじ筒４の雌ねじ部４ｂに対する雄ねじ部５Ａｂは、中間ねじ筒４の雌ねじ部４ｂに対応して逆ねじ方向としてある。また、両５Ａａ，５Ａｂのリードは、それぞれ端側ねじ筒３の雌ねじ部３ａと中間ねじ筒４の雌ねじ部４ｂとそれぞれ合わせて互いに異ならせてある。各雄ねじ部品５，５Ａの外径は、鉄筋１の雄ねじ部１ａの外径と同じである。   The other (left side of the figure) male screw part 5A includes a male screw part 5a screwed into the female screw part 3a of the end side screw cylinder 3 and male screw parts 5Aa and 5Ab screwed into the other female screw part 4b of the intermediate screw cylinder 4. Are parts such as steel bars provided on both sides with respect to the approximate center in the axial direction. The male screw portion 5Aa with respect to the end side screw cylinder 3 is a forward screw, while the male screw portion 5Ab with respect to the female screw portion 4b of the intermediate screw cylinder 4 is in a reverse screw direction corresponding to the female screw portion 4b of the intermediate screw cylinder 4. Further, the leads of both 5Aa and 5Ab are different from each other in combination with the female screw portion 3a of the end side screw tube 3 and the female screw portion 4b of the intermediate screw tube 4, respectively. The outer diameter of each male screw part 5, 5 </ b> A is the same as the outer diameter of the male screw part 1 a of the reinforcing bar 1.

なお、上記各雄ねじ部および雌ねじ部の断面形状は、３角ねじ、台形ねじ、矩形ねじ等のいずれであっても良い。   The cross-sectional shape of each of the male screw portion and the female screw portion may be any of a triangular screw, a trapezoidal screw, a rectangular screw, and the like.

上記構成の双方固定鉄筋用ねじ式鉄筋継手の接続方法を説明する。図３において、両側の鉄筋１，１は、既にコンクリート内に埋め込まれて固定状態にある。この状態で、継手部品組２の各部品により接続する。両鉄筋１，１の端側ねじ筒３は、雄ねじ部１ａから突出しないか、または突出長さが短くなるように、鉄筋１の中央側へねじ込んでおく。両側の雄ねじ部品５，５Ａは、中間ねじ筒４にねじ込んでおき、これら３部品が接続された接続体として準備しておく。この３部品接続体を、両側の鉄筋１，１間に持って来る。３部品接続体は、中間ねじ筒４に対して両側の雄ねじ部品５，５Ａが互いに逆ねじの雄ねじ部５ｂ，５Ａｂで螺合しているため、中間ねじ筒４を回すことで全体長さの調整が可能であり、両側の鉄筋１，１間の間隔に応じて、適宜長さ調整しておく。この状態で、鉄筋１，１にねじ込まれている端側ねじ筒３を順次ねじ戻し、３部品接続体の各雄ねじ部品５，５Ａの雄ねじ部５ａ，５Ａａにねじ込む。   The connection method of the screw type reinforcing bar joint for both fixed reinforcing bars of the above-mentioned composition is explained. In FIG. 3, the reinforcing bars 1 and 1 on both sides are already embedded in the concrete and in a fixed state. In this state, connection is made by each component of the joint component set 2. The end side screw cylinders 3 of both the reinforcing bars 1 and 1 are screwed into the central side of the reinforcing bar 1 so as not to protrude from the male threaded portion 1a or to shorten the protruding length. The male screw parts 5 and 5A on both sides are screwed into the intermediate screw cylinder 4 and prepared as a connection body to which these three parts are connected. Bring this three-part connecting body between the reinforcing bars 1 and 1 on both sides. In the three-component connecting body, the male screw parts 5 and 5A on both sides of the intermediate screw cylinder 4 are screwed together with the male screw portions 5b and 5Ab of the opposite threads. Adjustment is possible, and the length is appropriately adjusted according to the interval between the reinforcing bars 1 and 1 on both sides. In this state, the end-side screw cylinder 3 screwed into the reinforcing bars 1 and 1 is sequentially unscrewed and screwed into the male screw parts 5a and 5Aa of the male screw parts 5 and 5A of the three-part connecting body.

このとき、いずれか先にねじ込む端側ねじ筒３と雄ねじ部品５（または５Ａ）とのねじ込み時は、３部品接続体を回せば、端側ねじ筒３の雌ねじ部３ａと雄ねじ部品５（または５Ａ）の雄ねじ部５ａ（または５Ａａ）とのねじ込みが円滑に行える。しかし、後にねじ込む端側ねじ筒３と雄ねじ部品５Ａ（または５）とのねじ込み時は、通常は、互いにねじ込む雌ねじ部３ａと雄ねじ部５Ａａ（または５ａ）との螺旋面が一致せず、ねじ込むことができない。このとき、中間ねじ筒４を回転させ、または雄ねじ部品５Ａ（または５）を中間ねじ筒４に対して回転させて適宜の量だけねじ戻すと、鉄筋１の雄ねじ部１ａと雄ねじ部品５，５Ａの中間ねじ筒４に対する雄ねじ部５ｂ，５Ａｂのリードの違いのため、鉄筋１の雄ねじ部１ａのねじ面の延長上に、雄ねじ部品５，５Ａの雄ねじ部５ａ，５Ａａが一致する状態が生じる。すなわち、雄ねじ部５ａ，５Ａａの端部位置およびそのねじ溝端の位相が、端側ねじ筒３に螺合可能な状態となる。   At this time, when the end-side screw cylinder 3 and the male screw part 5 (or 5A) to be screwed first are turned, if the three-part connecting body is turned, the female screw part 3a of the end-side screw cylinder 3 and the male screw part 5 (or 5A) can be smoothly screwed with the male screw portion 5a (or 5Aa). However, when the end side screw cylinder 3 and the male screw part 5A (or 5) to be screwed later are screwed, the screw surfaces of the female screw part 3a and the male screw part 5Aa (or 5a) to be screwed to each other usually do not coincide with each other. I can't. At this time, when the intermediate screw cylinder 4 is rotated or the male screw part 5A (or 5) is rotated with respect to the intermediate screw cylinder 4 and screwed back by an appropriate amount, the male screw part 1a of the rebar 1 and the male screw parts 5, 5A Due to the difference in the leads of the male screw parts 5b and 5Ab with respect to the intermediate screw cylinder 4, the male screw parts 5a and 5Aa of the male screw parts 5 and 5A coincide with each other on the extension of the thread surface of the male screw part 1a of the reinforcing bar 1. That is, the positions of the end portions of the male screw portions 5a and 5Aa and the phase of the end of the thread groove are in a state that can be screwed into the end side screw cylinder 3.

このように、この双方固定鉄筋用ねじ式鉄筋継手は、ねじ式鉄筋継手でありながら、既にコンクリート等に双方とも固定された鉄筋１，１を相互に接続可能となる。また、グラウト注入式特殊継手のような養生期間が不要であり、ねじ式鉄筋継手における優れた施工性、施工期間短縮の利点が得られる。   In this way, the threaded reinforcing bar joint for both fixed reinforcing bars is a threaded reinforcing bar joint, but the reinforcing bars 1 and 1 that are already both fixed to concrete or the like can be connected to each other. Moreover, the curing period like a grout injection type special joint is unnecessary, and the advantage of the outstanding workability and shortening of a construction period in a screw-type reinforcing bar joint is acquired.

図６〜図８は、この発明の第２の実施形態に係る双方固定鉄筋用ねじ式鉄筋継手を示す。この実施形態の双方固定鉄筋用ねじ式鉄筋継手は、同心に配置されて互いに接続される一対の鉄筋１，１の対向端部を雄ねじ部１ａ，１ａに形成し、両鉄筋１，１の雄ねじ部１ａ，１ａ間を接続する継手部品組２Ｂを設けたものである。一対の鉄筋１，１が、継手部品組２Ｂによる接続作業時には、既に鉄筋コンクリート（図示せず）内に固定され、コンクリート面から端部が突出するものである点については、第１の実施形態と同様である。 この実施形態は、継手部品組２Ｂが、一対の鉄筋１，１の雄ねじ部１ａ，１ａにそれぞれ一部が螺合する一対の外周側ねじ筒６と、一対の両面ねじ筒７と、雄ねじ部品８とでなる。鉄筋１の雄ねじ部１ａについては、第１の実施形態と同じであるため、説明を省略する。   6 to 8 show a threaded reinforcing bar joint for double-fixed reinforcing bars according to a second embodiment of the present invention. In the threaded reinforcing bar joint for both fixed reinforcing bars of this embodiment, opposing ends of a pair of reinforcing bars 1 and 1 arranged concentrically and connected to each other are formed in male threaded parts 1a and 1a, and the male thread of both reinforcing bars 1 and 1 is formed. A joint part set 2B for connecting the parts 1a and 1a is provided. A pair of rebars 1 and 1 are already fixed in reinforced concrete (not shown) at the time of connection work by the joint component set 2B, and the end portion protrudes from the concrete surface. It is the same. In this embodiment, the joint component set 2B includes a pair of outer side screw cylinders 6, a pair of double-sided screw cylinders 7, and a male screw part. 8 and so on. About the external thread part 1a of the reinforcing bar 1, since it is the same as 1st Embodiment, description is abbreviate | omitted.

各外周側ねじ筒６，６は、鋼製のスリーブの内周面に、全長に渡って一様な雌ねじ部６ａを、ねじ切り加工で形成したものである。雌ねじ部６ａは、鉄筋１の雄ねじ部１ａが螺合する内径、リード、およびねじ溝断面形状のものである。   Each of the outer peripheral side screw cylinders 6 and 6 is formed by threading a female thread portion 6a that is uniform over the entire length on the inner peripheral surface of a steel sleeve. The female thread portion 6a has an inner diameter, a lead, and a thread groove cross-sectional shape into which the male thread portion 1a of the reinforcing bar 1 is screwed.

各両面ねじ筒７は、それぞれ内外の周面が共にねじ面に形成され、外周の雄ねじ部７ａで、各外周側ねじ筒６の雌ねじ部６ａにおける鉄筋１の雄ねじ部１ａが螺合する部分と反対側部分に螺合する。両面ねじ筒７は、外周の雄ねじ部７ａと内周の雌ねじ部７ｂのリードを互いに異ならせている。いずれのリードを大きくしても良いが、図示の例では、内周の雌ねじ部７ｂのリードを小さくしている。両面ねじ筒７も、鋼製のスリーブにねじ加工したものである。   Each double-sided screw cylinder 7 has both inner and outer peripheral surfaces formed as thread surfaces, and a male screw portion 7a on the outer periphery, and a portion where the male screw portion 1a of the reinforcing bar 1 in the female screw portion 6a of each outer screw tube 6 is screwed. Screw into the opposite part. In the double-sided screw cylinder 7, the leads of the outer peripheral male screw portion 7a and the inner peripheral female screw portion 7b are different from each other. Any lead may be enlarged, but in the example shown in the figure, the lead of the inner peripheral female screw portion 7b is made smaller. The double-sided screw cylinder 7 is also threaded into a steel sleeve.

雄ねじ部品８は、一対の両面ねじ筒７，７の内周の雌ねじ部７ｂ，７ｂに両端が螺合する部品であり、全長に渡って外周面が雄ねじ部８ａに形成された鋼製の両切りボルトからなる。雄ねじ部品８の雄ねじ部８ａのリードは、両面ねじ筒７の内周の雌ねじ部７ｂに合致するリードであり、鉄筋１の雄ねじ部１ａのリードとは異なっている。   The male screw part 8 is a part in which both ends are threadedly engaged with the female screw parts 7b, 7b on the inner periphery of the pair of double-sided screw cylinders 7, 7, and is a steel double-cut with the outer peripheral surface formed on the male screw part 8a over the entire length. Consists of bolts. The lead of the male screw part 8 a of the male screw part 8 is a lead that matches the female screw part 7 b on the inner periphery of the double-sided screw cylinder 7, and is different from the lead of the male screw part 1 a of the reinforcing bar 1.

第２の実施形態に係る双方固定鉄筋用ねじ式鉄筋継手の接続方法を説明する。図８（Ａ）において、両側の鉄筋１，１は、既にコンクリート内に埋め込まれて固定状態にある。この状態で、継手部品組２Ｂの各部品により接続する。両鉄筋１，１の外周側ねじ筒６は、雄ねじ部１ａから突出しないか、または突出長さが短くなるように、鉄筋１の中央側へねじ込んでおく。両側の両面ねじ筒７，７は、雄ねじ部品８にねじ込んでおき、これら３部品が接続された接続体として準備しておく。この３部品接続体を、両側の鉄筋１，１間に持って来る（同図（Ｂ））。   The connection method of the screw-type reinforcing bar joint for both fixed reinforcing bars which concerns on 2nd Embodiment is demonstrated. In FIG. 8A, the reinforcing bars 1 and 1 on both sides are already embedded in the concrete and in a fixed state. In this state, it connects by each component of the coupling component group 2B. The outer peripheral side screw cylinder 6 of both the reinforcing bars 1 and 1 is screwed into the center side of the reinforcing bar 1 so as not to protrude from the male threaded portion 1a or to shorten the protruding length. The double-sided screw cylinders 7 and 7 on both sides are screwed into the male screw part 8 and prepared as a connection body to which these three parts are connected. This three-part connecting body is brought between the reinforcing bars 1 and 1 on both sides ((B) in the same figure).

この状態で、鉄筋１，１にねじ込まれている外周側ねじ筒６，６を順次ねじ戻し、３部品接続体の各両面ねじ筒７，７の外周の雄ねじ部７ａ，７ａにねじ込む（同図（Ｃ），（Ｄ））。
このとき、いずれか先にねじ込む外周側ねじ筒６（図示の例では左側の外周側ねじ筒６）とのねじ込み時は、３部品接続体を回せば、外周側ねじ筒６の雌ねじ部６ａと両面ねじ筒７の雄ねじ部７ａとのねじ込みが円滑に行える。しかし、後にねじ込む外周側ねじ筒６と両面ねじ筒７とのねじ込み時は、通常は、互いにねじ込む雌ねじ部６ａと雄ねじ部７ａとの螺旋面が一致せず、ねじ込むことができない。このとき、雄ねじ部品８に対して両面ねじ筒７を回転させると、両面ねじ筒７の内周の雌ねじ部７ｂおよび雄ねじ部品８の雄ねじ部８ａと鉄筋１の雄ねじ部１ａとのリードの違いのため、鉄筋１の雄ねじ部１ａのねじ面の延長上に、両面ねじ筒７の外周の雄ねじ部７ａが一致する状態が生じる。すなわち、雄ねじ部７ａの端部位置およびそのねじ溝端の位相が、外周側ねじ筒６の雌ねじ部６ａに螺合可能な状態となる。 In this state, the outer peripheral side screw cylinders 6 and 6 screwed into the reinforcing bars 1 and 1 are sequentially unscrewed and screwed into the male screw portions 7a and 7a on the outer periphery of the double-sided screw cylinders 7 and 7 of the three-part connecting body (the same figure (C), (D)).
At this time, at the time of screwing with the outer peripheral side screw cylinder 6 (the left outer peripheral side screw cylinder 6 in the example shown in the figure) that is screwed first, if the three-part connecting body is turned, the female thread portion 6a of the outer peripheral side screw cylinder 6 and Screwing with the male threaded portion 7a of the double-sided screw cylinder 7 can be performed smoothly. However, at the time of screwing the outer peripheral side screw cylinder 6 and the double-sided screw cylinder 7 to be screwed later, normally, the helical surfaces of the female screw part 6a and the male screw part 7a to be screwed with each other do not coincide with each other, and the screwing cannot be performed. At this time, when the double-sided screw cylinder 7 is rotated with respect to the male screw part 8, there is a difference in lead between the internal thread part 7b on the inner periphery of the double-sided screw cylinder 7 and the external thread part 8a of the external thread part 8 and the external thread part 1a of the reinforcing bar 1. Therefore, on the extension of the threaded surface of the male threaded portion 1 a of the reinforcing bar 1, a state occurs in which the male threaded portion 7 a on the outer periphery of the double-sided screw cylinder 7 matches. That is, the end position of the male screw portion 7 a and the phase of the end of the screw groove are in a state that can be screwed into the female screw portion 6 a of the outer peripheral side screw cylinder 6.

このように、この実施形態の双方固定鉄筋用ねじ式鉄筋継手においても、ねじ式鉄筋継手でありながら、既にコンクリート等に双方とも固定された鉄筋１，１を相互に接続可能となる。また、グラウト注入式特殊継手のような養生期間が不要であり、ねじ式鉄筋継手における優れた施工性、施工期間短縮の利点が得られる。   As described above, even in the screw-type reinforcing bar joint for double-fixed reinforcing bars of this embodiment, the reinforcing bars 1 and 1 that are both fixed to concrete or the like can be connected to each other even though they are screw-type reinforcing bar joints. Moreover, the curing period like a grout injection type special joint is unnecessary, and the advantage of the outstanding workability and shortening of a construction period in a screw-type reinforcing bar joint is acquired.

図９は、鉄筋セットの一例を示す。この鉄筋セットは、互いに同心に接続される４本以上の鉄筋１（１A ，１B ）と、隣合う鉄筋同士をそれぞれ接続する３つ以上のねじ式鉄筋継手１０（１０A 〜１０C ）とからなる。これらのねじ式鉄筋継手１０として、双方固定鉄筋用ねじ式鉄筋継手１０A と、標準ねじ式鉄筋継手１０B と、長さ調整ねじ式鉄筋継手１０C とを設ける。図示の例では、５本の鉄筋１と、４つのねじ式鉄筋継手１０とで１組のセットとしてあり、標準ねじ式鉄筋継手１０B を２個用いている。   FIG. 9 shows an example of a reinforcing bar set. The reinforcing bar set includes four or more reinforcing bars 1 (1A, 1B) concentrically connected to each other and three or more screw-type reinforcing bar joints 10 (10A to 10C) for connecting adjacent reinforcing bars. As these screw-type reinforcing bar joints 10, there are provided a screw-type reinforcing bar joint 10A for both fixed reinforcing bars, a standard screw-type reinforcing bar joint 10B, and a length-adjusting screw-type reinforcing bar joint 10C. In the illustrated example, five reinforcing bars 1 and four threaded reinforcing bar joints 10 form a set, and two standard threaded reinforcing bar joints 10B are used.

中間の鉄筋１A は、いずれも、両端に雄ねじ部１ａを形成したものである。雄ねじ部１ａは、上記各実施形態で説明した構成のものである。両端の鉄筋１B は、接続側端に上記雄ねじ部１ａを形成し、非接続側の端部は、Ｔヘッド等と呼ばれる一般部よりも拡径した定着用の拡径頭部１ｂとしてある。双方固定鉄筋用ねじ式鉄筋継手１０A には、図１〜図５と共に前述した第１の実施形態に係るもの、または図６〜図８と共に前述した第２の実施形態に係るものが用いられる。   Each of the intermediate reinforcing bars 1A is formed by forming male threaded portions 1a at both ends. The male screw portion 1a has the configuration described in the above embodiments. The reinforcing bars 1B at both ends form the male screw portion 1a at the connection side end, and the end portion on the non-connection side is a diameter-expanded head portion 1b for fixing which is larger in diameter than a general portion called a T head or the like. As the screw-type reinforcing bar joint 10A for both fixed reinforcing bars, the one according to the first embodiment described above with reference to FIGS. 1 to 5 or the one according to the second embodiment described above with reference to FIGS.

図１１に示すように、標準ねじ式鉄筋継手１０B は、一対の鉄筋１，１の対向端部の雄ねじ部１ａ，１ａに両端が螺合するねじ筒１１を設けたものである。ねじ筒１１は、鋼製のスリーブの内周面に、全長に渡って一様な雌ねじ部１１ａを、ねじ切り加工で形成したものである。   As shown in FIG. 11, the standard screw-type reinforcing bar joint 10 </ b> B is provided with a screw cylinder 11 having both ends screwed into male screw parts 1 a and 1 a at opposite ends of a pair of reinforcing bars 1 and 1. The screw cylinder 11 is formed by threading a female thread portion 11a that is uniform over the entire length on the inner peripheral surface of a steel sleeve.

図１２に示すように、長さ調整ねじ式鉄筋継手１０C は、一対の鉄筋１，１の対向端部の雄ねじ部１ａ，１ａ間を接続する継手部品組２Ｃを設けたものである。この継手部品組２Ｃは、各鉄筋１の雄ねじ部１ａにそれぞれ一部が螺合する一対のねじ筒１３，１３と、これら両ねじ筒１３，１３に両端が螺合する調整用雄ねじ部品１４とでなる。各ねじ筒１３は、鋼製のスリーブの内周面に、全長に渡って一様な雌ねじ部１３ａを、ねじ切り加工で形成したものである。調整用雄ねじ部品１４は、全長に渡って外周面が雄ねじ部１４ａが形成された鋼製の両切りボルトからなり、鉄筋１の雄ねじ部１ａと同径である。調整用雄ねじ部品１４は、任意の長さに切断して用いられ、または長さの異なる複数種類の調整用雄ねじ部品１４を準備し、任意の長さのものを選択して用いる。この調整用雄ねじ部品１４の切断または選択により、両側の鉄筋１，１間の長さの調整が成される。調整用雄ねじ部品１４のねじ込み深さの調整によっても、ある程度の長さ調整が行える。   As shown in FIG. 12, the length adjusting screw type reinforcing steel joint 10 </ b> C is provided with a joint component set 2 </ b> C for connecting between the male screw parts 1 a and 1 a at the opposite ends of the pair of reinforcing bars 1 and 1. The joint component set 2C includes a pair of screw cylinders 13 and 13 partially screwed into the male screw portion 1a of each reinforcing bar 1, and an adjustment male screw component 14 having both ends screwed into the screw cylinders 13 and 13. It becomes. Each screw cylinder 13 is formed by threading a female thread portion 13a that is uniform over the entire length on the inner peripheral surface of a steel sleeve. The adjusting male screw component 14 is a steel double-sided bolt having an outer peripheral surface formed with a male screw portion 14 a over the entire length, and has the same diameter as the male screw portion 1 a of the reinforcing bar 1. The adjustment male screw component 14 is used after being cut to an arbitrary length, or a plurality of types of adjustment male screw components 14 having different lengths are prepared, and those having an arbitrary length are selected and used. The length between the reinforcing bars 1 and 1 on both sides is adjusted by cutting or selecting the male screw part 14 for adjustment. The length can be adjusted to some extent by adjusting the screwing depth of the adjusting male screw component 14.

図１３，図１４は、一端の鉄筋１（１B ）における拡径頭部１ｂの一例を示す。この拡径頭部１ｂは、鉄筋１に設けられた雄ねじ部１ａに、拡径頭部形成部品１５を、この部品１５の有する雌ねじ部１５ａで螺合させたものである。この拡径頭部形成部品１５を螺合させる雄ねじ部１ａは、鉄筋１（１B ）の他端の雄ねじ部１ａと同じ構成のものとしているが、径やピッチが異なるものであっても良い。いずれの場合も、雄ねじ部１ａは、溝底径が鉄筋１の一般部分の外径に対して同径以上とされる。拡径頭部形成部品１５の正面形状は、図１４（Ａ）のような円形であっても、また同図（Ｂ）のような矩形であっても良い。   FIGS. 13 and 14 show an example of a diameter-expanded head 1b in the reinforcing bar 1 (1B) at one end. The enlarged diameter head 1 b is obtained by screwing an enlarged diameter head forming component 15 with an external thread portion 15 a included in the component 15 to an external thread portion 1 a provided on the reinforcing bar 1. The male screw portion 1a to which the diameter-enlarged head forming component 15 is screwed has the same configuration as the male screw portion 1a at the other end of the reinforcing bar 1 (1B), but may have a different diameter or pitch. In any case, the male screw portion 1 a has a groove bottom diameter equal to or larger than the outer diameter of the general portion of the reinforcing bar 1. The front shape of the enlarged diameter head forming component 15 may be a circle as shown in FIG. 14A or a rectangle as shown in FIG.

鉄筋１（１B ）における拡径頭部１ｂは、図１５に示すように鉄筋１に塑性加工によって拡径状態に一体に形成したものであっても良い。   The enlarged diameter head 1b of the reinforcing bar 1 (1B) may be formed integrally with the reinforcing bar 1 in an expanded state by plastic working as shown in FIG.

図１０は、この鉄筋セットを用いる一例を示す。この鉄筋セットは、例えば同図に示すような鉄筋コンクリート造建物における桁行方向の大梁２１における上端筋や下端筋等の主筋２２に用いられる。大梁２１は、建物の両端の鉄筋コンクリートの柱２３，２３間に設けられ、両柱２３，２３間に複数の中間柱２４が設けられる。上記鉄筋セットを１本に接続した主筋２２は、両端の柱２３，２３間に設けれら、両端の拡径頭部１ｂが両端の柱２３，２３のコンクリート内に埋め込まれる。大梁２１は、例えば、長さ方向に並ぶ複数本の梁分割体となるプレキャストコンクリート梁を接続したものとされ、そのプレキャストコンクリート梁間の主筋の接続等に、双方固定鉄筋用ねじ式鉄筋継手１０A が用いられる。   FIG. 10 shows an example using this reinforcing bar set. This reinforcing bar set is used, for example, for main bars 22 such as upper and lower bars in the beam 21 in the direction of the beam in a reinforced concrete building as shown in FIG. The girder 21 is provided between the reinforced concrete columns 23 and 23 at both ends of the building, and a plurality of intermediate columns 24 are provided between the columns 23 and 23. The main reinforcing bar 22 having the reinforcing bar set connected to one is provided between the pillars 23, 23 at both ends, and the enlarged heads 1b at both ends are embedded in the concrete of the pillars 23, 23 at both ends. The girder 21 is, for example, connected to a plurality of precast concrete beams that are divided into a plurality of beams arranged in the length direction. For connection of the main reinforcement between the precast concrete beams, a threaded reinforcing bar joint 10A for both fixed reinforcing bars is used. Used.

この構成の鉄筋セットによると、双方固定鉄筋用ねじ式鉄筋継手１０A を用いた箇所では、互いに接続する鉄筋１，１が既にコンクリート等に双方とも固定されていても接続することができる。長さ調整ねじ式鉄筋継手１０B を用いた箇所では、調整用雄ねじ部品１４を任意の長さに切断や選択して長さを変えたり、ねじ込み深さを変えることで、互いに接続する鉄筋１，１間の長さの調整が行える。標準ねじ式鉄筋継手１０C を用いた箇所では、簡易な構成で安価なねじ式鉄筋継手で接続が行える。   According to the reinforcing bar set having this configuration, at the place where the screw-type reinforcing bar joint 10A for both-fixed reinforcing bars is used, the reinforcing bars 1 and 1 to be connected to each other can be connected even if both are already fixed to concrete or the like. At locations using the length-adjusting screw-type reinforcing bar joint 10B, the adjusting male screw component 14 is cut or selected to an arbitrary length to change the length or to change the screwing depth, thereby connecting the reinforcing bars 1 to each other. The length between 1 can be adjusted. In a place using the standard screw type rebar joint 10C, it is possible to connect with an inexpensive screw type rebar joint with a simple configuration.

鉄筋コンクリート造建物の桁行方向の梁主筋２１などでは、その総長が例えば数十メートルと非常に長く、また鉄筋コンクリート柱が先に打設された状態で、その中を通る鉄筋を接続する箇所や、建物毎の長さの違いに対応させる必要が生じたりする。しかし、これらの要望に対して、双方固定鉄筋用ねじ式鉄筋継手１０A や長さ調整ねじ式鉄筋継手１０B で対応することができる。接続後に固定すれば良い鉄筋に対しては、標準ねじ式鉄筋継手１０C で対応できる。これらの標準ねじ式鉄筋継手１０C 、長さ調整ねじ式鉄筋継手１０B 、および双方固定鉄筋用ねじ式鉄筋継手１０A と、雄ねじ部１ａを有する鉄筋１とがセットとして準備されるため、鉄筋１や継手等の資材準備を簡易に行うことができる。   The beam main reinforcement 21 in the beam direction of a reinforced concrete building has a very long total length of, for example, several tens of meters, and a reinforced concrete column is placed in the first place. It may be necessary to cope with the difference in length. However, it is possible to meet these demands with the threaded reinforcing bar joint 10A for both fixed reinforcing bars and the length adjusting screw type reinforcing bar joint 10B. Reinforcing bars that need only be fixed after connection can be handled with the standard screw-type reinforcing bar joint 10C. Since these standard threaded reinforcing bar joint 10C, length-adjustable threaded reinforcing bar joint 10B, and threaded reinforcing bar joint 10A for both fixed reinforcing bars and the reinforcing bar 1 having the male threaded portion 1a are prepared as a set. The material preparation such as can be easily performed.

鉄筋配列の端部に配置される鉄筋１が拡径頭部１ｂを有する場合は、鉄筋端部の定着部を、長く折り曲げたものとする場合に比べて、配筋がすっきりとして簡素になる。拡径頭部１ｂの形成には工場での加工段階が必要となるが、同じく工場での加工が必要となるねじ式鉄筋継手用の雄ねじ部１ａを有する鉄筋１では、工場での加工が合理的に行え、拡径頭部１ｂの工場加工の手間に比べ、拡径頭部１ｂによる現場での配筋の簡素化の利点の影響が大きい。これにより、鉄筋１の継手部から鉄筋端部の定着部に渡って、施工性に優れたものとできる。
拡径頭部１ｂが、鉄筋１に設けられた雄ねじ部１ａに拡径頭部形成部品１５を螺合させたものである場合は、いずれの鉄筋も両端が雄ねじ部を有するものとして準備すれば良く、生産性により優れる。鉄筋継手１０用の雄ねじ部１ａと拡径頭部用１ｂの雄ねじ部１ａとを同じ仕様に統一すれば、より生産性に優れたものとなる。 When the reinforcing bar 1 arranged at the end of the reinforcing bar arrangement has the enlarged head 1b, the arrangement of the reinforcing bar at the end of the reinforcing bar is neatly simplified as compared with a case where the fixing part is bent long. Forming the enlarged diameter head 1b requires a processing step at the factory, but the rebar 1 having the male threaded portion 1a for the screw-type reinforcing bar joint that also requires processing at the factory is rational for processing at the factory. Compared to the labor for processing the enlarged diameter head 1b, the advantage of simplification of the bar arrangement at the site by the enlarged diameter head 1b is large. Thereby, it can be made excellent in workability from the joint part of the reinforcing bar 1 to the fixing part of the reinforcing bar end part.
If the enlarged diameter head 1b is obtained by screwing the enlarged diameter head forming component 15 into the male threaded portion 1a provided on the reinforcing bar 1, both the reinforcing bars should be prepared as having both ends of the male threaded portion. Good, more productive. If the male thread part 1a for the reinforcing bar joint 10 and the male thread part 1a of the enlarged diameter head part 1b are unified to the same specification, the productivity is further improved.

１…鉄筋
１ａ…雄ねじ部
１ｂ…拡径頭部
２…継手部品組
２Ｂ…継手部品組
２Ｃ…継手部品組
３…端側ねじ筒
３ａ…雌ねじ部
４…中間ねじ筒
４ａ，４ｂ…雌ねじ部
５，５Ａ…雄ねじ部品
５ａ，５ｂ，５Ａａ，５Ａｂ…雄ねじ部
６…外周側ねじ筒
６ａ…雌ねじ部
７…両面ねじ筒
７ａ…雄ねじ部
７ｂ…雌ねじ部
８…雄ねじ部品
８ａ…雄ねじ部
１０A …双方固定鉄筋用ねじ式鉄筋継手
１０B …標準ねじ式鉄筋継手
１０C …長さ調整ねじ式鉄筋継手
１１…ねじ筒
１３…ねじ筒
１４…調整用雄ねじ部品
１５…拡径頭部形成部品
DESCRIPTION OF SYMBOLS 1 ... Reinforcing bar 1a ... Male thread part 1b ... Diameter expansion head 2 ... Joint part group 2B ... Joint part group 2C ... Joint part group 3 ... End side screw cylinder 3a ... Female thread part 4 ... Intermediate thread cylinder 4a, 4b ... Female thread part 5 , 5A ... male screw parts 5a, 5b, 5Aa, 5Ab ... male screw part 6 ... outer peripheral side screw cylinder 6a ... female screw part 7 ... double-sided screw cylinder 7a ... male screw part 7b ... female screw part 8 ... male screw part 8a ... male screw part 10A ... both fixed Reinforcing bar threaded joint 10B Standard threaded joint 10C Length adjusting threaded joint 11 Screw cylinder 13 Screw cylinder 14 Male thread adjustment part 15 Expanded head forming part

Claims (5)

双方とも固定された一対の同心の鉄筋を接合可能とする双方固定鉄筋用ねじ式鉄筋継手であって、
前記一対の鉄筋の対向端部を、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成し、両鉄筋の雄ねじ部間を接続する継手部品組を設け、
この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対の端側ねじ筒と、これら端側ねじ筒の間に位置させる中間ねじ筒と、それぞれ各端側ねじ筒と中間ねじ筒とに両端が螺合する一対の雄ねじ部品とでなり、
前記中間ねじ筒は、内周面に形成された一端側の雌ねじ部と他端側の雌ねじ部とを互いに逆ねじとし、かつ両雌ねじ部のリードを、端側ねじ筒の雌ねじ部のリードと互いに異ならせた
ことを特徴とする双方固定鉄筋用ねじ式鉄筋継手。 A screw-type rebar joint for both fixed rebars that can join a pair of concentric rebars that are both fixed,
The opposing ends of the pair of reinforcing bars are formed in male threaded portions in which the groove bottom diameter of the thread groove is equal to or greater than the outer diameter of the general part, and a joint component set for connecting the male threaded portions of both reinforcing bars is provided. ,
The joint component set includes a pair of end-side screw cylinders that are partially screwed into the male screw portions of the pair of reinforcing bars, an intermediate screw cylinder positioned between the end-side screw cylinders, and each end-side screw cylinder. And a pair of male screw parts whose both ends are screwed to the intermediate screw cylinder,
The intermediate screw cylinder includes a female screw portion on one end side and a female screw portion on the other end side formed on the inner peripheral surface as reverse threads, and leads of both female screw portions are connected to leads of the female screw portion of the end screw cylinder. A screw-type reinforcing bar joint for both fixed reinforcing bars, characterized by being different from each other. 双方とも固定された一対の同心の鉄筋を接合可能とする双方固定鉄筋用ねじ式鉄筋継手であって、
前記一対の鉄筋の対向端部を、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成し、両鉄筋の雄ねじ部間を接続する継手部品組を設け、
この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対の外周側ねじ筒と、それぞれ内外の周面が共にねじ面に形成されて前記各外周側ねじ筒の雌ねじ部における前記鉄筋の雄ねじ部が螺合する部分と反対側部分に螺合する一対の両面ねじ筒と、これら一対の両面ねじ筒の内周の雌ねじ部に両端が螺合した雄ねじ部品とでなり、前記両面ねじ筒は、外周側のねじ面である雄ねじ部と内周側のねじ面である雌ねじ部のリードを互いに異ならせた
ことを特徴とする双方固定鉄筋用ねじ式鉄筋継手。 A screw-type rebar joint for both fixed rebars that can join a pair of concentric rebars that are both fixed,
The opposing ends of the pair of reinforcing bars are formed in male threaded portions in which the groove bottom diameter of the thread groove is equal to or greater than the outer diameter of the general part, and a joint component set for connecting the male threaded portions of both reinforcing bars is provided. ,
The joint component set includes a pair of outer peripheral side screw cylinders that are partly screwed into the male threaded portions of the pair of reinforcing bars, and inner and outer peripheral surfaces that are both formed on a screw surface, and the female screw of each outer peripheral side screw cylinder. A pair of double-sided screw cylinders that are screwed to the opposite side of the part where the male screw part of the reinforcing bar is screwed, and a male screw part that is screwed at both ends to the female screw part on the inner periphery of the pair of double-sided screw cylinders. The double-sided screw cylinder is characterized in that the lead of the external thread side which is the external thread surface and the internal thread part which is the internal thread surface are different from each other, and the screw type reinforcing bar joint for both fixed reinforcing bars. 互いに同心に接続される４本以上の鉄筋と、隣合う鉄筋同士をそれぞれ接続する３つ以上のねじ式鉄筋継手とからなり、前記各鉄筋は、前記鉄筋継手で接続される端部が、ねじ溝の溝底径が一般部分の外径に対して同径以上となる雄ねじ部に形成され、前記ねじ式鉄筋継手として、標準ねじ式鉄筋継手と、長さ調整ねじ式鉄筋継手と、双方固定鉄筋用ねじ式鉄筋継手とを設け、
前記標準ねじ式鉄筋継手は、一対の鉄筋の対向端部の雄ねじ部に両端が螺合するねじ筒を設けたものであり、
前記長さ調整ねじ式鉄筋継手は、一対の鉄筋の対向端部の雄ねじ部間を接続する継手部品組を設け、この継手部品組は、前記一対の鉄筋の雄ねじ部にそれぞれ一部が螺合する一対のねじ筒と、これら両ねじ筒に両端が螺合する調整用雄ねじ部品とでなり、
前記双方固定鉄筋用ねじ式鉄筋継手は請求項１または請求項２記載の双方固定鉄筋用ねじ式鉄筋継手とした、
鉄筋・継手セット。 It consists of four or more rebars connected concentrically with each other and three or more threaded rebar joints that connect adjacent rebars to each other. Each rebar has a threaded end connected to the rebar joint. The groove bottom diameter is formed on the male threaded part where the diameter of the groove is equal to or greater than the outer diameter of the general part. As the threaded rebar joint, both the standard threaded rebar joint and the length-adjusted threaded rebar joint are fixed. With a threaded steel rebar joint for rebar,
The standard screw-type reinforcing bar joint is provided with a screw cylinder whose both ends are screwed to the male threaded portion of the opposing end of a pair of reinforcing bars,
The length-adjustable screw-type reinforcing bar joint is provided with a joint part set for connecting between male threaded parts at opposite ends of a pair of reinforcing bars, and the joint part set is partially threadedly engaged with the male threaded part of the pair of reinforcing bars. A pair of screw cylinders, and male screw parts for adjustment whose both ends are screwed into these screw cylinders,
The screw rebar joint for both fixed rebars is a screw rebar joint for both fixed rebars according to claim 1 or claim 2,
Reinforcing bar and fitting set. 請求項３記載の鉄筋・継手セットにおいて、鉄筋配列の端部に配置される両鉄筋における非接続側の端部が、一般部よりも拡径した定着力付与用の拡径頭部である鉄筋・継手セット。   4. The reinforcing bar / joint set according to claim 3, wherein the non-connecting end of both reinforcing bars arranged at the end of the reinforcing bar arrangement is a diameter-enlarged head for imparting fixing force with a diameter larger than that of the general part.・ Fitting set. 請求項４において、前記拡径頭部は、鉄筋の端部に設けられた雄ねじ部に、拡径頭部形成部品を、この部品の有する雌ねじ部で螺合したものである鉄筋・継手セット。
5. The reinforcing bar / joint set according to claim 4, wherein the enlarged diameter head is obtained by screwing an enlarged head forming part into an external thread part provided at an end of the reinforcing bar with an internal thread part of the part.
JP2009237159A 2009-10-14 2009-10-14 Screw-type reinforced joint for both fixed reinforcements, and reinforcement and joint set Pending JP2011084897A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6373467B1 (en) * 2017-09-28 2018-08-15 章 福田 Reinforcement using screw-type reinforcing bar joints, rebar for length adjustment, and method of bar arrangement
US11274446B2 (en) 2016-10-13 2022-03-15 Akira Fukuda Screw-type rebar joint structure of deformed rebar and manufacturing method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11274446B2 (en) 2016-10-13 2022-03-15 Akira Fukuda Screw-type rebar joint structure of deformed rebar and manufacturing method thereof
JP6373467B1 (en) * 2017-09-28 2018-08-15 章 福田 Reinforcement using screw-type reinforcing bar joints, rebar for length adjustment, and method of bar arrangement

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