JP2011084898A - Reinforced structure with head and joint - Google Patents

Reinforced structure with head and joint Download PDF

Info

Publication number
JP2011084898A
JP2011084898A JP2009237160A JP2009237160A JP2011084898A JP 2011084898 A JP2011084898 A JP 2011084898A JP 2009237160 A JP2009237160 A JP 2009237160A JP 2009237160 A JP2009237160 A JP 2009237160A JP 2011084898 A JP2011084898 A JP 2011084898A
Authority
JP
Japan
Prior art keywords
reinforcing bar
screw
head
male
diameter
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.)
Pending
Application number
JP2009237160A
Other languages
Japanese (ja)
Inventor
廣三 ▲脇▼山
Kozo Wakiyama
Akira Fukuda
章 福田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Ichi High Frequency Co Ltd
Original Assignee
Dai Ichi High Frequency Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dai Ichi High Frequency Co Ltd filed Critical Dai Ichi High Frequency Co Ltd
Priority to JP2009237160A priority Critical patent/JP2011084898A/en
Publication of JP2011084898A publication Critical patent/JP2011084898A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Reinforcement Elements For Buildings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforced structure with a head and a joint, which enables the facilitation of production and the simplification of production equipment, while obtaining the advantages of savings in the amount of reinforcement for use, the simplification of bar arrangement, a reduction in excessively-concentrated bar arrangement, proper connection workability, and a shortened construction period. <P>SOLUTION: This reinforced structure with the head and the joint includes the reinforcement 1 having male screws 1a and 1a provided at both ends, a diameter-enlarged head forming component 3 which is screwed to the male screw 1a of one end of the reinforcement 1 with a female screw 3a and which forms a diameter-enlarged head 3A for the application of an anchoring force at the one end of the reinforcement 1, and a screw cylinder 2. The screw cylinder 2, which has an inner peripheral surface formed in a female screw 2a, has one end screwed to the other end of the reinforcement 1, and has the other end screwed to the male screw 1a of an end of another reinforcement 1A, so as to connect both the reinforcements 1 and 1A together. A reinforcement joint 2A comprises the screw cylinder 2 and the male screws 1a and 1a. <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頭部・継手付き鉄筋構造に関する。   The present invention relates to a rebar structure with a head and a joint used for reinforced concrete.

一般に、鉄筋コンクリート造梁の主筋の端部は、柱コンクリートへの定着の確実のために、上下方向に折り曲げた折り曲げ部分とされる。しかし、上記折り曲げ部分は、使用する鉄筋量の増加を招き、また柱内の配筋が複雑になる。このような課題を解決する工法として、端部に拡径した頭部を有する鉄筋を用い、折り曲げ部に代わる定着強度を持たせるものがある(例えば、特許文献1)。この工法は、Tヘッド鉄筋工法、あるいは機械式鉄筋定着方式などと呼ばれている。上記拡径頭部付き鉄筋の加工は、梁へ使用時の長さよりも若干長い寸法の素材鉄筋の端部を、高周波誘導加熱等で加熱し、加圧成形することにより行われる。   In general, the end of the main bar of the reinforced concrete beam is a bent portion that is bent in the vertical direction in order to ensure the fixing to the column concrete. However, the bent portion increases the amount of reinforcing bars to be used, and the bar arrangement in the column becomes complicated. As a construction method for solving such a problem, there is a method of using a reinforcing bar having a head having a diameter enlarged at an end portion to give a fixing strength in place of a bent portion (for example, Patent Document 1). This method is called a T-head rebar method or a mechanical rebar fixing method. The above-mentioned rebar with a diameter-enlarged head is processed by heating the end of a material rebar having a dimension slightly longer than the length when used for a beam by high-frequency induction heating or the like, followed by pressure forming.

また、鉄筋コンクリート造梁等の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。
Further, in reinforced concrete such as reinforced concrete beams, various types of reinforced joints are used in order to convert a limited length of reinforcing bars into continuous reinforcing bars 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3に示すものが提案されている。これは、鉄筋の端部に拡径した雄ねじ部を設け、ねじ筒で両鉄筋の雄ねじ部を接続するものである。   The screw type joint has an advantage that the curing period required for the grout injection type special joint is not required, but has not yet been put into practical use. For example, the one shown in Patent Document 3 has been proposed. In this method, a male screw portion having an enlarged diameter is provided at an end portion of a reinforcing bar, and the male screw portions of both reinforcing bars are connected by a screw cylinder.

特開平11−293850号公報JP 11-293850 A 特開2000−257209号公報JP 2000-257209 A 特開平11−336256号公報JP-A-11-336256

上記拡径頭部付きの鉄筋を用いる工法は、使用鉄筋量の節減や、配筋の簡素化、過密配筋の軽減を図る面で非常に優れた工法である。また、ねじ式鉄筋継手は、上記のように配筋構造の簡素化、接続作業性、施工期間の面で優れている。そのため、拡径頭部付き鉄筋とねじ式鉄筋継手とを併用することを考えた。両者を併用すれば、配筋の簡素化の面で非常に優れたものとなる。   The construction method using a reinforcing bar with an enlarged head is an excellent construction method in terms of reducing the amount of reinforcing bars used, simplifying the reinforcement, and reducing overcrowded reinforcement. In addition, the threaded reinforcing bar joint is excellent in terms of simplification of the bar arrangement structure, connection workability, and construction period as described above. Therefore, we considered using a reinforcing bar with an enlarged head and a screw-type reinforcing bar joint in combination. If both are used together, it will be very excellent in terms of simplification of the bar arrangement.

しかし、上記のように拡径頭部付きの鉄筋の生産には、高周波誘導加熱等で加熱し、加圧成形により拡径頭部を形成することか必要であるため、生産に手間がかかり、また大掛かりな生産設備が必要となる。ねじ式鉄筋継手の製造にも、鉄筋の端部に拡径した雄ねじ部を加工することが必要であり、この雄ねじ部の加工に手間と設備が要する。そのため、拡径頭部付き鉄筋とねじ式鉄筋継手との併用は、生産の手間や設備の面で困難であり、コスト増を招く。   However, as mentioned above, the production of reinforcing bars with an enlarged head requires heating by high-frequency induction heating or the like, and it is necessary to form the enlarged head by pressure molding, so it takes time to produce, In addition, large-scale production facilities are required. Also in the manufacture of a screw-type reinforcing bar joint, it is necessary to process a male thread portion having an enlarged diameter at the end of the reinforcing bar, and labor and equipment are required for processing the male thread portion. Therefore, the combined use of the reinforcing bar with an enlarged head and the threaded reinforcing bar joint is difficult in terms of production effort and equipment, and causes an increase in cost.

この発明の目的は、拡径頭部付きの鉄筋とねじ式鉄筋継手とが併用されて、両者の利点である使用鉄筋量の節減、配筋の簡素化、過密配筋の軽減、接続作業性、施工期間短縮の利点を得ながら、生産が容易で、生産設備も簡素化できる頭部・継手付き鉄筋構造を提供することである。   The object of the present invention is that a reinforcing bar with an enlarged head and a screw-type reinforcing bar joint are used in combination, and the advantages of both are the reduction of the amount of reinforcing bars used, simplification of bar arrangement, reduction of overcrowded bar arrangement, connection workability It is to provide a rebar structure with a head and joints that can be easily produced and simplified in production facilities while obtaining the advantage of shortening the construction period.

この発明の頭部・継手付き鉄筋構造は、両端に雄ねじ部を有する鉄筋と、この鉄筋の一端の雄ねじ部に雌ねじ部で螺合し前記鉄筋の一端に定着力付与用の拡径頭部を形成する拡径頭部形成部品と、内周面が雌ねじ部に形成されて一端で前記鉄筋の他端に螺合し、他端で他の鉄筋の端部の雄ねじ部に螺合して両鉄筋を接続するねじ筒とを備える。前記両端の雄ねじ部は、ねじ溝の溝底径が鉄筋の一般部分の外径に対して同径以上となる太径部とする。
この構成によると、拡径頭部付きの鉄筋とできて、その使用鉄筋量の節減、配筋の簡素化、過密配筋の軽減の利点が得られるうえ、ねじ式鉄筋継手とできて、その配筋簡素化、接続作業性、施工期間短縮の利点が得られる。配筋簡素化は、拡径頭部付き鉄筋とねじ式鉄筋継手の双方で得られ、併用によってより一層高い効果が得られる。しかも、この発明によると、拡径頭部を、鉄筋端部の雄ねじ部に拡径頭部形成部品を螺合して形成するため、誘導加熱および加圧成形で大きな拡径頭部を形成する場合に比べて、簡素な設備で容易に生産できる。特に、鉄筋の両端に雄ねじを形成し、拡径頭部の形成と鉄筋継手とに用いるため、両者の共通性により生産性が優れたものとなる。鉄筋の雄ねじ部の形成は、誘導加熱および加圧成形により拡径部分を形成し、その外周にねじ切りを行うようにしても良いが、その場合でも、拡径頭部を成形する場合に比べて雄ねじ部となる部分の外径は小さくて済むため、加熱,加圧による生成が容易である。雄ねじ部は、ねじ溝の溝底径が鉄筋の一般部分の外径に対して同径以上となる太径部とするため、一般径部分にねじ溝を切るものと異なり、強度確保が行える。
The rebar structure with a head and joint according to the present invention includes a rebar having male threaded portions at both ends, and a male threaded portion at one end of the rebar and screwed with a female threaded portion, and an enlarged head for imparting fixing force to one end of the rebar. The diameter-enlarged head forming component to be formed and the inner peripheral surface are formed in the female threaded portion, and are screwed into the other end of the reinforcing bar at one end and screwed into the male threaded portion at the end of the other reinforcing bar at the other end. A screw cylinder for connecting the reinforcing bars. The male screw portions at both ends are large diameter portions in which the groove bottom diameter is equal to or greater than the outer diameter of the general portion of the reinforcing bar.
According to this configuration, a reinforcing bar with an enlarged head can be formed, and the advantages of reducing the amount of reinforcing bars used, simplifying the reinforcing bars, and reducing overcrowded reinforcing bars can be obtained. Advantages of simplification of bar arrangement, connection workability, and shortened construction period are obtained. The simplification of bar arrangement is obtained with both the reinforcing bar with an enlarged head and the threaded reinforcing bar joint, and a higher effect can be obtained by the combined use. In addition, according to the present invention, the enlarged diameter head is formed by screwing the enlarged diameter head forming component into the male threaded portion of the reinforcing bar end, so that a large enlarged head is formed by induction heating and pressure molding. Compared to the case, it can be easily produced with simple equipment. In particular, since male threads are formed at both ends of the reinforcing bar and used for the formation of the enlarged diameter head and the reinforcing bar joint, productivity is excellent due to the commonality between the two. The male threaded part of the reinforcing bar may be formed by induction heating and pressure molding to form a diameter-expanded part and threaded on its outer periphery, but even in that case, compared to the case where the diameter-expanded head is molded. Since the outer diameter of the male screw portion can be small, generation by heating and pressurization is easy. Since the male thread portion is a large diameter portion in which the groove bottom diameter of the thread groove is equal to or larger than the outer diameter of the general portion of the reinforcing bar, the strength can be ensured unlike the case where the thread groove is cut in the general diameter portion.

この発明において、前記両端に雄ねじを有する鉄筋における両端の雄ねじ部は、互いに同一の仕様とするのが良い。
両端の雄ねじ部の仕様が同じであれば、各雄ねじ部を拡径頭部と鉄筋継手のどちらに用いても良く、現場施工時に鉄筋の方向性が生じず、施工性がより一層すぐれたものとなる。また、両端の雄ねじ部の仕様を同じとすることで、雄ねじ部の形成作業も両端に共通化できて、生産性に優れたものとなる。
In the present invention, the male screw portions at both ends of the reinforcing bar having male screws at both ends may have the same specifications.
If the specifications of the male threaded part at both ends are the same, each male threaded part can be used for either the enlarged head or the reinforcing bar joint, and the direction of the reinforcing bar does not occur during construction on site, and the workability is even better. It becomes. In addition, by making the specifications of the male screw portions at both ends the same, it is possible to share the work of forming the male screw portions at both ends, resulting in excellent productivity.

この発明において、前記ねじ筒の外周面のおける両端の軸方向の端部から雌ねじ部のねじ山の1山ないし複数山に渡る長さ範囲を、先細りとなるテーパ形状としても良い。
ねじ筒の両側の鉄筋の間に引っ張り力が作用すると、鉄筋の雄ねじ部とねじ筒の雌ねじ部との螺合部分を介して、両鉄筋間に引っ張り力が伝達される。このとき、上記引っ張り力は、螺合部分の各周部分に均等に分散して負荷されるのではなく、ねじ筒の入口側となる第1周目のねじ山の螺合部分に最も大きな力が作用し、ある程度の応力集中が生じる。しかし、この請求項の発明は、ねじ筒の外周面における、端縁から、ねじ山の1山ないし複数山に渡る長さの範囲を、先細りとなるテーパ状部としたため、弾性変形が生じ易くなり、最も大きな力が作用する部分となるねじ筒入口付近の部分が、引っ張り力の作用により拡径状態に弾性変形する。このため、2周目以降の各周の螺合部分が負担する引っ張り力が増えることなり、螺合部分における各周部分の応力伝達が均一化され、ねじ筒を厚肉化することなく、より大きな力の伝達が可能となる。
In this invention, it is good also considering the length range from the edge part of the axial direction of the both ends in the outer peripheral surface of the said screw cylinder to one or several threads of the thread of a female thread part as a taper shape which tapers off.
When a pulling force acts between the reinforcing bars on both sides of the screw cylinder, the pulling force is transmitted between the reinforcing bars via the threaded portion between the male threaded portion of the reinforcing bar and the female threaded portion of the screw cylinder. At this time, the tensile force is not evenly distributed and loaded on each peripheral portion of the screwed portion, but the largest force is applied to the screwed portion of the first thread on the inlet side of the screw cylinder. Acts to cause some stress concentration. However, in the invention of this claim, since the range of the length from the end edge on the outer peripheral surface of the screw cylinder to one or a plurality of threads is a tapered portion that is tapered, elastic deformation is likely to occur. Thus, the portion near the screw cylinder entrance where the greatest force acts is elastically deformed into a diameter-expanded state by the action of the pulling force. For this reason, the tensile force borne by the screwing portion of each circumference after the second round will increase, the stress transmission of each peripheral portion in the screwing portion will be made uniform, and without increasing the thickness of the screw cylinder, A large force can be transmitted.

この発明において、前記ねじ筒の軸方向の中央部分を、外径面が拡径した厚肉部としても良い。ねじ筒には、軸方向の中央に至るに従って、各周の螺合部分で負担する引っ張り力が加算されることになり、軸方向の中央では、両側の鉄筋の間に引っ張り力が全て作用することになる。しかし、ねじ筒の中央部分が厚肉部とされていると、ねじ筒中央部での強度不足の問題がなく、また厚肉部は強度の必要な中央部分だけであるため、ねじ筒を構成する鋼材の無駄がない。ねじ筒の上記厚肉部分は、外径側へ拡径させて設けるため、内径側へ膨らませる場合と異なり、ねじ筒内に鉄筋の雄ねじ部を、中央を超えて他端側までねじ込むことの障害とならない。そのため、厚肉部で施工性の低下を招くことがない。   In the present invention, the central portion in the axial direction of the screw cylinder may be a thick portion whose outer diameter surface is enlarged. As the screw tube reaches the center in the axial direction, the tensile force borne by the threaded portion of each circumference is added. At the center in the axial direction, all the tensile force acts between the reinforcing bars on both sides. It will be. However, if the central part of the screw cylinder is a thick part, there is no problem of insufficient strength at the central part of the screw cylinder, and the thick part is only the central part requiring strength, so the screw cylinder is configured. There is no waste of steel. Unlike the case where the thick part of the screw cylinder is expanded to the outer diameter side and expanded to the inner diameter side, the male threaded part of the reinforcing bar is screwed into the screw cylinder beyond the center to the other end side. It does not become an obstacle. Therefore, the workability is not lowered at the thick portion.

この発明の頭部・継手付き鉄筋構造は、両端に雄ねじ部を有する鉄筋と、この鉄筋の一端の雄ねじ部に雌ねじ部で螺合し前記鉄筋の一端に定着力付与用の拡径頭部を形成する拡径頭部形成部品と、内周面が雌ねじ部に形成されて一端で前記鉄筋の他端に螺合し、他端で他の鉄筋の端部の雄ねじ部に螺合して両鉄筋を接続するねじ筒とを備え、前記両端の雄ねじ部は、ねじ溝の溝底径が鉄筋の一般部分の外径に対して同径以上となる太径部としたため、拡径頭部付きの鉄筋とねじ式鉄筋継手とが併用されて、両者の利点である使用鉄筋量の節減、配筋の簡素化、過密配筋の軽減、接続作業性、施工期間短縮の利点を得ながら、生産が容易で、生産設備も簡素化できる。
特に、鉄筋両端の雄ねじ部を互いに同一の仕様とした場合は、拡径頭部付きの鉄筋とねじ式鉄筋継手との雄ねじ部共通化により、現場施工性および工場生産性に双方に優れたものとなる。
The rebar structure with a head and joint according to the present invention includes a rebar having male threaded portions at both ends, and a male threaded portion at one end of the rebar and screwed with a female threaded portion, and an enlarged head for imparting fixing force to one end of the rebar. The diameter-enlarged head forming component to be formed and the inner peripheral surface are formed in the female threaded portion, and are screwed into the other end of the reinforcing bar at one end and screwed into the male threaded portion at the end of the other reinforcing bar at the other end. A screw cylinder for connecting a reinforcing bar, and the male threaded portion at both ends is a large-diameter portion in which the groove bottom diameter of the screw groove is equal to or larger than the outer diameter of the general portion of the reinforcing bar, In combination with the rebar and threaded rebar joint, the advantages of both are the reduction of the amount of reinforcing bars used, the simplification of rebars, the reduction of overcrowding, the workability of connection, and the shortening of the construction period. And production facilities can be simplified.
In particular, when the male threaded parts on both ends of the reinforcing bar have the same specifications, the common threaded part of the reinforcing bar with the enlarged head and the screw-type reinforcing bar joint is excellent in both on-site workability and factory productivity. It becomes.

この発明の第1の実施形態にかかる頭部・継手付き鉄筋構造の破断正面である。It is a fracture | rupture front of the reinforcing bar structure with a head and a joint concerning 1st Embodiment of this invention. 同頭部・継手付き鉄筋構造を用いた鉄筋コンクリート造の柱・梁配筋構造を示す正面図である。It is a front view showing a reinforced concrete column / beam arrangement structure using a rebar structure with the same head and joint. 同頭部・継手付き鉄筋構造における拡径頭部を分解状態で示す破断正面図である。It is a fracture front view which shows the diameter expansion head in the reinforcing bar structure with the same head and a joint in an exploded state. (A)〜(C)は拡径頭部形成部品の各種の例を各々示す正面図である。(A)-(C) are front views which show the various examples of a diameter-expansion head formation component, respectively. 同頭部・継手付き鉄筋構造におけるねじ式鉄筋継手部分の断面図である。It is sectional drawing of the screw-type reinforcing bar joint part in the reinforcing bar structure with the same head and a joint. 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. 同頭部・継手付き鉄筋構造における拡径頭部の変形例を示す破断側面図である。It is a fracture | rupture side view which shows the modification of the enlarged diameter head in the reinforcing bar structure with the same head and a joint. この発明の他の実施形態に係る頭部・継手付き鉄筋構造の断面図である。It is sectional drawing of the reinforcing bar structure with a head and a joint concerning other embodiments of this invention. さらに他の実施形態に係る頭部・継手付き鉄筋構造のねじ式鉄筋継手を示す断面図である。It is sectional drawing which shows the screw-type reinforcing bar joint of the reinforcing bar structure with a head and a joint concerning other embodiment. 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. さらに他の実施形態における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 in other embodiment. (A)は図12のXIII−XIII線断面図、(B)は同断面で示すねじ筒の変形例の断面図である。(A) is the XIII-XIII sectional view taken on the line of FIG. 12, (B) is sectional drawing of the modification of the screw cylinder shown in the same section. さらに他の実施形態に係る頭部・継手付き鉄筋構造の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 of the reinforcing bar structure with a head and a joint concerning other embodiments. さらに他の実施形態に係る頭部・継手付き鉄筋構造の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 of the reinforcing bar structure with a head and a joint concerning other embodiments.

この発明の第1の実施形態を図1ないし図7に基づいて説明する。この頭部・継手付き鉄筋構造は、両端に雄ねじ部1a,1aを有する鉄筋1と、この鉄筋1の一端(図の右側端)の雄ねじ部1aに雌ねじ部3aで螺合し前記鉄筋1の一端に定着力付与用の拡径頭部3Aを形成する拡径頭部形成部品3と、ねじ筒2とを備える。ねじ筒2は、内周面が雌ねじ部2aに形成され、このねじ筒一端で前記鉄筋1の他端に螺合し、他端で他の鉄筋1Aの端部の雄ねじ部1aに螺合して両鉄筋1,1Aを接続する。ねじ筒2と、両側の鉄筋1,1Aの雄ねじ1a,1aとで、鉄筋継手2Aを構成する。鉄筋1の両端の雄ねじ部1a,aは、互いに同一の仕様である。   A first embodiment of the present invention will be described with reference to FIGS. This rebar structure with a head / joint includes a rebar 1 having male screw portions 1a, 1a at both ends, and a male screw portion 1a at one end (right end in the figure) of the rebar 1 and screwed with a female screw portion 3a. A diameter-enlarged head forming component 3 that forms a diameter-enlarged head 3 </ b> A for imparting fixing force at one end and a screw cylinder 2 are provided. An inner peripheral surface of the screw cylinder 2 is formed in the female thread portion 2a, and is screwed into the other end of the reinforcing bar 1 at one end of the screw cylinder, and is screwed into the male screw portion 1a at the end of the other reinforcing bar 1A at the other end. Connect both reinforcing bars 1 and 1A. The screw cylinder 2 and the male threads 1a and 1a of the reinforcing bars 1 and 1A on both sides constitute a reinforcing bar joint 2A. The male screw portions 1a, a at both ends of the reinforcing bar 1 have the same specifications.

鉄筋1,1Aの雄ねじ部1aは、ねじ溝の溝底径を鉄筋1の一般部分の外径d1 (図3)に対して同径以上とする。鉄筋1は、例えば図9に示すような半円状突条1bおよび軸方向突条1c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1b,1c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。   The external thread portion 1a of the reinforcing bars 1 and 1A has a groove bottom diameter equal to or larger than the outer diameter d1 (FIG. 3) of the general portion of the reinforcing bar 1. The reinforcing bar 1 may be a deformed reinforcing bar having projecting portions such as a semicircular ridge 1b and an axial ridge 1c as shown in FIG. In that case, the male screw 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 1b and 1c, 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.

鉄筋1,1Aの雄ねじ部1aのピッチ円直径d2 (=2r)は、他に支承が生じない範囲で大きくすることが好ましい。これは次の理由による。雄ねじ部1aの全体のねじ溝長さは、雄ねじ部1aの軸方向長さをl、リードをP1 とすると〔2πr×(l/P1 )〕となる。ねじの力の伝達能力はねじ溝長さに依存するため、同じねじ溝長さを得るにつき、ピッチ円直径d2 (=2r)を大きくすることで、雄ねじ部1aの軸方向長さlが大幅に短くなる。また、ピッチ円直径d2 を大きくすると、雄ねじ部1aをねじ溝深さの深い溝とすることが可能であり、ねじの力の伝達能力も増す。雄ねじ部1aの軸方向長さlを短くすると、ねじ筒2の長さも短くて済み、鉄筋1の周辺の配筋との干渉が避けられる。例えば、鉄筋1,1Aが梁や柱の主筋等である場合、その周辺にスターラップやフープとなる配筋が多く設けられるが、このような配筋に対して雄ねじ部1aやねじ筒2が干渉することが、回避され易くなる。   It is preferable to increase the pitch circle diameter d2 (= 2r) of the male threaded portion 1a of the reinforcing bars 1 and 1A within a range where no other bearing is generated. This is due to the following reason. The overall thread groove length of the male screw portion 1a is [2πr × (l / P1)] where l is the axial length of the male screw portion 1a and P1 is the lead. Since the ability to transmit the screw force depends on the thread groove length, the axial length l of the male thread portion 1a is greatly increased by increasing the pitch circle diameter d2 (= 2r) to obtain the same thread groove length. Becomes shorter. Further, when the pitch circle diameter d2 is increased, the male threaded portion 1a can be a groove having a deep thread groove depth, and the transmission capability of the screw force is also increased. If the axial length 1 of the male screw portion 1a is shortened, the length of the screw cylinder 2 can be shortened, and interference with the surrounding bar arrangement of the reinforcing bar 1 can be avoided. For example, when the reinforcing bars 1 and 1A are the main bars of a beam or a column, there are many reinforcing bars that form stirrups or hoops around the reinforcing bars 1 and 1A. Interference is easily avoided.

鉄筋1に、このような太径の雄ねじ部1aを設ける方法としては、例えば次の2種類の方法が採用できる。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とする方法である。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とする方法である。   For example, the following two types of methods can be employed as a method of providing the reinforcing bar 1 with such a large-diameter male screw portion 1a. 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 a method to do. The other is a method in which a male screw member 1a having a large diameter is formed by joining a male screw member having 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.

拡径頭部形成部品3は、鋼板または鋼製のブロック材に穴を設けて雌ねじ部3aを形成した部品である。拡径頭部形成部品3の正面形状は、例えば図4(A)のように円形としても、また同図(B),(C)のように矩形としても良い。雌ねじ部3aは、拡径頭部形成部品3の中心に設けても良く、また図4(C)のように中心から偏った位置に設けても良い。拡径頭部形成部品3の正面形状は、この他に任意の形状とできる。また、拡径頭部形成部品3の断面形状は、図1のように平板状としても、また図8のように、内周部が軸方向に対して厚肉部3bとなった形状等としても良い。   The diameter-enlarged head forming component 3 is a component in which a female screw portion 3a is formed by providing a hole in a steel plate or steel block material. The front shape of the enlarged diameter head forming component 3 may be, for example, a circle as shown in FIG. 4 (A) or a rectangle as shown in FIGS. 4 (B) and (C). The female screw portion 3a may be provided at the center of the enlarged diameter head forming component 3, or may be provided at a position deviated from the center as shown in FIG. In addition to this, the front shape of the diameter-enlarged head forming component 3 can be an arbitrary shape. Moreover, the cross-sectional shape of the diameter-enlarged head forming component 3 may be a flat plate shape as shown in FIG. 1 or a shape in which the inner peripheral portion is a thick portion 3b in the axial direction as shown in FIG. Also good.

図1において、ねじ式鉄筋継手2Aを説明する。このねじ式鉄筋継手2Aは、互いに連結される一対の鉄筋1,1Aの対向する端部を太径の雄ねじ部1aに形成し、内周面が、前記一対の鉄筋1,1Aの雄ねじ部1a,1aが螺合する雌ねじ部2aとされたねじ筒2を設けたものである。ねじ筒2の外周面における、両端の軸方向の端縁から、雌ねじ部2aのねじ山の1山ないし複数山に渡る長さの範囲Lは、先細りとなるテーパ状部2bとしてある。雄ねじ部1aおよび雌ねじ部2aの、ねじ溝およびねじ山の断面形状は、図示の例では3角形状としているが、台形状や矩形状であっても良い。この実施形態では、両鉄筋1,1Aの雄ねじ部1a,1aの螺旋方向は互いに同じ方向としてある。ねじ筒2の雌ねじ部2aの螺旋方向は、ねじ筒2の全長に渡り同じ方向としてある。いずれも順ねじ方向である。   In FIG. 1, the threaded reinforcing bar joint 2 </ b> A will be described. In this threaded reinforcing bar joint 2A, opposing ends of a pair of reinforcing bars 1 and 1A connected to each other are formed in a large-diameter male screw part 1a, and an inner peripheral surface is a male screw part 1a of the pair of reinforcing bars 1 and 1A. , 1a is provided with a screw cylinder 2 which is an internal thread portion 2a to which the screw thread is engaged. A range L of a length extending from one edge of the screw thread 2 to a plurality of threads on the outer peripheral surface of the screw tube 2 from the axial end edges of both ends is a tapered portion 2b that is tapered. The cross-sectional shapes of the thread grooves and the thread threads of the male screw portion 1a and the female screw portion 2a are triangular in the illustrated example, but may be trapezoidal or rectangular. In this embodiment, the spiral directions of the male screw portions 1a and 1a of both the reinforcing bars 1 and 1A are the same. The spiral direction of the female thread portion 2 a of the screw cylinder 2 is the same direction over the entire length of the screw cylinder 2. Both are forward screw directions.

ねじ筒2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2aを、ねじ切り加工で形成したものである。ねじ筒2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。ねじ筒2の両端のテーパ状部2bは、切削加工で形成しても良く、また上記の増肉鋼管とする場合は、その増肉過程でテーパ状に形成しても良い。   The screw cylinder 2 is formed by threading a female thread portion 2a that is uniform over the entire length on the inner peripheral surface of a steel sleeve. The sleeve (not shown) that is the material of the screw cylinder 2 is obtained by cutting a thick steel pipe every length of the screw cylinder, or applying a compressive force to a general thick steel pipe. The thickness may be increased by induction heating to increase the thickness, and the increased thickness steel pipe may be cut off. The tapered portions 2b at both ends of the screw cylinder 2 may be formed by cutting, or may be formed in a tapered shape in the process of increasing the thickness when the above-described thickened steel pipe is used.

ねじ筒2の全体の長さは、両側の鉄筋1,2の雄ねじ部1aが互いに突き合わされる程度にねじ込まれた状態で、各雄ねじ部1aの端がねじ筒2の端と一致する程度の長さか、または雌ねじ部2aの開口縁に1周程度の未螺合部分が余る程度の長さとされる。図示の例では、1周程度の未螺合部分を余らせてある。なお、ねじ筒2の長さは、両側の鉄筋1の雄ねじ部1aの長さを加えた長さよりも十分に長くしても良い。その場合、両側の鉄筋1の雄ねじ部1aは、ねじ筒2の両端部に螺合し、対向する両側の雄ねじ部1aの間隔を広げることになる。   The entire length of the screw cylinder 2 is such that the ends of the male screw parts 1a coincide with the ends of the screw cylinder 2 in a state where the male screw parts 1a of the reinforcing bars 1 and 2 on both sides are screwed together. The length is such that the unthreaded portion of about one round is left on the opening edge of the female screw portion 2a. In the illustrated example, an unthreaded portion of about one turn is left behind. The length of the screw cylinder 2 may be sufficiently longer than the length obtained by adding the lengths of the male screw portions 1a of the reinforcing bars 1 on both sides. In that case, the male threaded portions 1a of the reinforcing bars 1 on both sides are screwed to both ends of the screw cylinder 2, and the interval between the opposing male threaded portions 1a is widened.

先細りとなるテーパ状部2aの長さ範囲Lは、長いほど好ましく、ねじ筒2の軸方向の中央まであっても良いが、中央部には、ねじ筒2を連結作業時に回転させるための工具の係合部分として、中央に直筒部分を残すことが好ましい。また、テーパ状部2aが長くなると、それだけテーパ状部2aの加工に手間がかかる。そのため、テーパ状部2aの長さ範囲Lは、ねじ筒2の一端から中央までの長さの3/4程度が好ましい。上記加工の手間を考慮すると、テーパ状部2aの形成による後述の応力伝達の均一化の効果が得られる範囲で、ある程度短くしても良い。このため、上記範囲Lは、雌ねじ部2aのねじ山の1山ないし2山程度(すなわち、ねじのリードの1リードまたは2リード程度)としても良く、またそれ以上としても良い。ねじ筒2の端部に、雄ねじ部1aの未螺合部分を生じさせる場合は、その未螺合部分となる長さに加えて、上記1山ないし2山程度に上記範囲Lを設定する。雌ねじ部2aのねじ山数は、例えば、中央から端縁までの各片側部分につき、7〜8山程度とされる。これは、同図の例のように両側の雄ねじ部1a,1aを略突き合わせる場合であり、両側の雄ねじ部1a,1aの間に広い間隔を開ける場合は、その間隔分を追加したねじ山数とする。   The length range L of the tapered portion 2a to be tapered is preferably as long as possible, and may be up to the center in the axial direction of the screw cylinder 2, but a tool for rotating the screw cylinder 2 at the time of connection work is provided at the center. As the engaging portion, it is preferable to leave a straight tube portion in the center. Moreover, if the taper-shaped part 2a becomes long, it will take time and effort to process the taper-shaped part 2a. Therefore, the length range L of the tapered portion 2a is preferably about 3/4 of the length from one end of the screw cylinder 2 to the center. Considering the labor of the above processing, it may be shortened to some extent as long as the effect of equalizing stress transmission described later by the formation of the tapered portion 2a can be obtained. Therefore, the range L may be about one or two threads of the female thread portion 2a (that is, about one or two leads of the screw lead) or may be more than that. When the unthreaded portion of the male thread portion 1a is generated at the end of the screw cylinder 2, the range L is set to the above-described one or two threads in addition to the length of the unthreaded portion. The number of threads of the female screw portion 2a is, for example, about 7 to 8 threads for each one side portion from the center to the edge. This is a case where the male screw portions 1a, 1a on both sides are substantially abutted as in the example of the figure, and when a wide space is provided between the male screw portions 1a, 1a on both sides, the screw thread to which the space is added is added. It is a number.

ねじ筒2のテーパ状部2bによる外径の絞り量(すなわちテーパ状部2bの最小径部分と最大径部分の半径の差)bは、例えば、ねじ筒2の肉厚tに対して、1/2〜1/5程度とすることが好ましく、1/3程度が最も好ましい。ねじ筒2の上記肉厚tは、雌ねじ部2aが形成されているので、有効断面積を与える断面形状における肉厚を示す。   The amount of restriction of the outer diameter by the tapered portion 2b of the screw cylinder 2 (that is, the difference in radius between the minimum diameter portion and the maximum diameter portion of the tapered portion 2b) b is, for example, 1 with respect to the wall thickness t of the screw cylinder 2. It is preferable to set it to about / 2 to 1/5, and about 1/3 is the most preferable. The wall thickness t of the screw cylinder 2 indicates the wall thickness in a cross-sectional shape giving an effective cross-sectional area since the female screw portion 2a is formed.

図2は、この頭部・継手付き鉄筋構造を適用した鉄筋コンクリート造の柱・梁配筋構造を示す正面図である。いずれも鉄筋コンクリート造とした両端の柱12,12の間に梁11を設けてある。中間柱13が設けられていても良い。梁11の配筋構造は、梁断面の上端および下端にそれぞれ幅方向に複数本並ぶ主筋21と、上下の主筋21の配列を囲むあばら筋14とで構成される。上記各主筋21に、この実施形態の頭部・継手付き鉄筋構造を適用している。各主筋21は、いずれも、梁両端の鉄筋1と、梁中間の鉄筋1Aとで構成され、各鉄筋1,1Aは互いに上記構成のねじ式鉄筋継手2Aで接続されている。梁両端の鉄筋1は、柱12内に埋め込まれる端部が、上記構成の拡径頭部3Aとされている。各柱12の配筋は、上下に延びる複数本の主筋15とあばら筋16とで構成される。柱12の主筋15につき、この実施形態の頭部・継手付き鉄筋構造を適用しても良い。   FIG. 2 is a front view showing a reinforced concrete column / beam arrangement structure to which the rebar structure with head and joints is applied. In both cases, a beam 11 is provided between the columns 12 and 12 at both ends made of reinforced concrete. An intermediate pillar 13 may be provided. The bar arrangement structure of the beam 11 includes a plurality of main bars 21 arranged in the width direction at the upper end and the lower end of the cross section of the beam 11 and ribs 14 surrounding the arrangement of the upper and lower main bars 21. The rebar structure with a head / joint of this embodiment is applied to each of the main bars 21. Each of the main bars 21 includes a reinforcing bar 1 at both ends of the beam and a reinforcing bar 1A in the middle of the beam, and the reinforcing bars 1 and 1A are connected to each other by the threaded reinforcing bar joint 2A having the above-described configuration. In the reinforcing bars 1 at both ends of the beam, the ends embedded in the pillars 12 are the enlarged-diameter heads 3A having the above-described configuration. The bar arrangement of each column 12 is composed of a plurality of main bars 15 and ribs 16 extending vertically. The reinforcing bar structure with head and joints of this embodiment may be applied to the main bar 15 of the column 12.

上記構成の頭部・継手付き鉄筋構造によると、図1のように、鉄筋1が拡径頭部3A付きの鉄筋とできて、折り曲げ部を有する鉄筋に比べ、その使用鉄筋量の節減、配筋の簡素化、過密配筋の軽減の利点が得られ、かつ、ねじ式鉄筋継手2Aとできて、その配筋簡素化、接続作業性、施工期間短縮の利点が得られる。配筋簡素化は、拡径頭部3A付き鉄筋とねじ式鉄筋継手2Aの双方で得られ、併用によってより一層高い効果が得られる。しかも、拡径頭部3Aを、鉄筋端部の雄ねじ部1aに拡径頭部形成部品3を螺合して形成するため、誘導加熱および加圧成形で大きな拡径頭部を形成する場合に比べて、簡素な設備で容易に生産できる。特に、鉄筋1の両端に雄ねじ1aを形成し、拡径頭部3Aの形成と鉄筋継手2Aとに用いるため、両者の共通性により生産性が優れたものとなる。鉄筋1の雄ねじ部1aは、誘導加熱および加圧成形により拡径部分を形成し、その外周にねじ切りを行うことで形成するが、拡径頭部3Aの全体を加熱,加圧で形成する場合に比べて、雄ねじ部1aとなる部分の外径は小さくて済むため、加熱,加圧による生成が容易である。雄ねじ部1aは、ねじ溝の溝底径が鉄筋の一般部分の外径に対して同径以上となる太径部とするため、一般径部分にねじ溝を切るものと異なり、強度確保が行える。   According to the reinforcing bar structure with head / joint having the above-described configuration, as shown in FIG. 1, the reinforcing bar 1 can be a reinforcing bar with an enlarged head 3A, and the amount of used reinforcing bar can be reduced and arranged compared to a reinforcing bar having a bent portion. Advantages of simplification of the bars and reduction of overcrowded arrangement can be obtained, and the threaded reinforcing bar joint 2A can be obtained, and the advantages of simplification of the arrangement, connection workability, and shortening of the construction period can be obtained. The simplification of the bar arrangement is obtained by both the reinforcing bar with the enlarged head 3A and the threaded reinforcing bar joint 2A, and a higher effect can be obtained by the combined use. Moreover, since the enlarged diameter head portion 3A is formed by screwing the enlarged diameter head forming component 3 into the male thread portion 1a at the end of the reinforcing bar, the large enlarged diameter head portion is formed by induction heating and pressure molding. In comparison, it can be easily produced with simple equipment. In particular, since the male thread 1a is formed at both ends of the reinforcing bar 1 and used for the formation of the enlarged diameter head 3A and the reinforcing bar joint 2A, productivity is excellent due to the commonality of both. The male thread portion 1a of the reinforcing bar 1 is formed by forming an enlarged diameter portion by induction heating and pressure molding and threading the outer periphery thereof, but when the entire enlarged diameter head 3A is formed by heating and pressing. Compared to the above, since the outer diameter of the portion that becomes the male screw portion 1a may be small, generation by heating and pressurization is easy. Since the male thread portion 1a is a large diameter portion in which the groove bottom diameter of the thread groove is equal to or larger than the outer diameter of the general portion of the reinforcing bar, the strength can be secured unlike the case where the thread groove is cut in the general diameter portion. .

また、鉄筋1における両端の雄ねじ部1aは互いに同一の仕様であるため、各雄ねじ部1a,1aを拡径頭部3Aと鉄筋継手2Aのどちらに用いても良く、現場施工時に鉄筋1の方向性が生なくて、施工性がより一層すぐれたものとなる。また、両端の雄ねじ部1aの仕様を同じとすることで、雄ねじ部1aの形成作業も両端に共通化できて、生産性に優れたものとなる。   Further, since the male threaded portions 1a at both ends of the reinforcing bar 1 have the same specifications, the male threaded parts 1a, 1a may be used for either the enlarged diameter head 3A or the reinforcing bar joint 2A. The product is not alive and the workability is even better. Further, by making the specifications of the male threaded portions 1a at both ends the same, the work of forming the male threaded portion 1a can be made common to both ends, and the productivity is excellent.

鉄筋継手2Aについては、次の作用,効果が得られる。両側の鉄筋1,1Aの間に引っ張り力が作用すると、鉄筋1,1Aの雄ねじ部1a,1aとねじ筒2の雌ねじ部2aとの螺合部分aを介して、両鉄筋1,1a間に引っ張り力が伝達される。このとき、上記引っ張り力は、螺合部分aの各周部分a1 〜an に均等に分散して負荷されるのではなく、ねじ筒の入口側となる第1周目のねじ山の螺合部分a1 に最も大きな力が作用し、ある程度の応力集中が生じる。しかし、この実施形態では、ねじ筒2の外周面における両端部を先細りとなるテーパ状部2aとしたため、弾性変形が生じ易くなり、最も大きな力が作用する部分となるねじ筒入口付近の部分が、引っ張り力の作用により拡径状態に弾性変形する。このため、2周目以降の各周の螺合部分a2 〜an における応力伝達が均一化され、ねじ筒2を厚肉化することなく、より大きな力の伝達が可能となる。また、ねじ山の螺合部分aの強度不足も解消される。   The following actions and effects can be obtained for the rebar joint 2A. When a tensile force acts between the rebars 1, 1 A on both sides, between the rebars 1, 1 a via the threaded portion a between the male screw portions 1 a, 1 a of the rebar 1, 1 A and the female screw portion 2 a of the screw cylinder 2. A pulling force is transmitted. At this time, the tensile force is not evenly distributed and loaded on each of the peripheral portions a1 to an of the screwing portion a, but the screwing portion of the first screw thread on the inlet side of the screw cylinder. The greatest force acts on a1, and some stress concentration occurs. However, in this embodiment, since both ends of the outer peripheral surface of the screw tube 2 are tapered portions 2a that are tapered, elastic deformation is likely to occur, and the portion near the screw tube inlet that is the portion where the greatest force acts is formed. Then, it is elastically deformed into an expanded state by the action of a pulling force. For this reason, the stress transmission in the screwed portions a2 to an of each circumference after the second round is made uniform, and a larger force can be transmitted without increasing the thickness of the screw cylinder 2. Further, the insufficient strength of the threaded portion a of the screw thread is also eliminated.

先細りとなるテーパ状部2aの長さ範囲Lは、応力伝達の均一化の面からは長いほど好ましいが、上記のように、ねじ筒2を連結作業時に回転させるための工具の係合部分として、中央に直筒部分を残すことが好ましく、またテーパ状部2aの加工の手間の観点からは短い方が好ましい。そのため、上記範囲Lは、雌ねじ部2aのねじ山の1〜2山程度から、ねじ筒2の一端から中央までの長さの3/4程度が好ましい。テーパ状部2bの長さ範囲Lが、ねじ山の1山未満の場合は、テーパ状部2aが変形容易となって応力集中が緩和されるという効果が不十分である。   The length range L of the tapered portion 2a to be tapered is preferably as long as possible from the viewpoint of uniform stress transmission. However, as described above, as the engaging portion of the tool for rotating the screw cylinder 2 during the connection work, In addition, it is preferable to leave a straight tube portion in the center, and from the viewpoint of labor of processing the tapered portion 2a, a shorter one is preferable. Therefore, the range L is preferably about 3/4 of the length from one to two threads of the female screw portion 2a to one end of the screw cylinder 2 to the center. When the length range L of the tapered portion 2b is less than one thread, the effect that the tapered portion 2a is easily deformed and stress concentration is relaxed is insufficient.

ねじ筒2で連結する一対の鉄筋1,1Aは、雄ねじ部1a,1aの端面を互いに突き合わせても、また非接触としても良いが、突き合わせた場合は、圧縮力が鉄筋1,1A間で直接に伝達される。なお、鉄筋コンクリートにおいて、主に鉄筋は引っ張りを負担する部材となるため、圧縮力の伝達については、ねじ式鉄筋継手において強度上の問題が生じ難い。   The pair of rebars 1, 1 </ b> A connected by the screw cylinder 2 may be butted against the end surfaces of the male screw portions 1 a, 1 a, but when they are abutted, the compression force is directly between the rebars 1, 1 </ b> A. Is transmitted to. In reinforced concrete, the reinforcing bar mainly serves as a member that bears the tension, and therefore, the transmission of the compressive force is unlikely to cause a problem in strength in the screw-type reinforcing bar joint.

図7は、この鉄筋の継手構造における接合方法の一例を示す。この接合方法は、同図(A)のように、一方の鉄筋1(同図の右側の鉄筋)の雄ねじ部1aを、ねじ筒2内に、そのねじ込み側端と反対側の端部の付近までねじ込む過程と、前記一方の鉄筋1に対して他方の鉄筋1Aを略突き合わせ状態(同図(B)の状態)とする過程と、前記一方の鉄筋1がねじ込まれたねじ筒2をねじ戻して、図1のように他方の鉄筋1に螺合させ、ねじ筒2が両側の鉄筋1,1Aの雄ねじ部1aに略均等にねじ込まれた状態とする過程とを含む。この場合に、上記一方の鉄筋1は、図7(A)のようにねじ筒2内にねじ込んで状態で、この鉄筋構造の製造工場から、鉄筋コンクリートの施工現場への運搬や、その途中での保管等を行い、このねじ筒2が螺合した状態で鉄筋1の配筋を行うことが好ましい。なお、上記の「略突き合わせ状態(同図(B)の状態)とする」とは、突き合せ状態とするか、または多少の隙間を介して対向状態にすることを言う。   FIG. 7 shows an example of a joining method in this reinforcing bar joint structure. In this joining method, as shown in FIG. 4A, the male threaded portion 1a of one reinforcing bar 1 (the reinforcing bar on the right side of the same figure) is placed in the screw cylinder 2 in the vicinity of the end opposite to the screwed side end. Screwing the screw cylinder 2 into which the one reinforcing bar 1 is screwed, and the process of making the other reinforcing bar 1A substantially abutted with the one reinforcing bar 1 (the state shown in FIG. 5B). 1 and includes a process of screwing into the other reinforcing bar 1 so that the screw cylinder 2 is screwed into the male screw portions 1a of the reinforcing bars 1 and 1A on both sides substantially evenly. In this case, the above-mentioned one reinforcing bar 1 is screwed into the screw cylinder 2 as shown in FIG. 7 (A), transported from the manufacturing factory of this reinforcing bar structure to the construction site of the reinforced concrete, It is preferable to arrange the reinforcing bars 1 in a state in which the screw cylinder 2 is screwed by storing or the like. In addition, the above-mentioned “substantially abutting state (state of FIG. 5B)” means that the state is a butting state or a facing state with a slight gap.

この接続方法によると、一方の鉄筋1の雄ねじ部1aを、ねじ筒2内にねじ込み側端と反対側の端部の付近までねじ込むため、互いに接合される一対の鉄筋につき、接続作業のために特に間隔を広げることなく、接続完了状態の配置としておいて、ねじ筒2をねじ戻すことにより接続が行える。また、両側の鉄筋1,1Aの雄ねじ部1a,1aが共に順ねじであるため、後に図10,図11と共に説明する片方を逆ねじとしたものに比べて、締結に大きな力を必要とせずに接続が行える。そのため、接続の作業性に優れる。また、一方の鉄筋1の雄ねじ部1aをねじ筒2で覆った状態で工場から施工現場への運搬や保管が行え、そのため鉄筋1の雄ねじ部1aが、運搬や取扱時に器物に当たることなどで傷つくことが防止される。   According to this connection method, since the male threaded portion 1a of one reinforcing bar 1 is screwed into the screw cylinder 2 to the vicinity of the end opposite to the screwed side end, a pair of reinforcing bars to be joined to each other are used for connecting work. Connection can be performed by unscrewing the screw cylinder 2 in an arrangement in a connection completed state without widening the interval. Further, since the male thread portions 1a and 1a of the reinforcing bars 1 and 1A on both sides are both forward threads, a large force is not required for fastening as compared with the case where one of them will be described later with reference to FIGS. Can be connected. Therefore, the workability of connection is excellent. Further, the male threaded portion 1a of one of the reinforcing bars 1 can be transported and stored from the factory to the construction site with the screw cylinder 2 covered, so that the male threaded portion 1a of the reinforcing bar 1 is damaged by hitting an object during transportation or handling. It is prevented.

また、上記の例では、拡径頭部3A付きとする鉄筋1側にねじ筒2を螺合して準備するようにしたため、この鉄筋1を拡径頭部形成部品3およびねじ筒2付きとして準備することができ、運搬,保管に便利である。なお、ねじ筒2は、拡径頭部3Aを有しない鉄筋1A側にねじ込んで準備しても良い。また、ねじ筒2で接続する両側の鉄筋1,1Aとも、拡径頭部3A付きであっても良く、その場合、いずれの鉄筋1,1A側にねじ筒2をねじ込んで準備しても良い。   Further, in the above example, since the screw cylinder 2 is prepared by being screwed to the reinforcing bar 1 side with the enlarged diameter head 3A, the reinforcing bar 1 is provided with the enlarged diameter head forming component 3 and the screw cylinder 2. It can be prepared and is convenient for transportation and storage. Note that the screw cylinder 2 may be prepared by being screwed into the reinforcing bar 1A side that does not have the enlarged diameter head 3A. Further, both the reinforcing bars 1 and 1A on both sides connected by the screw cylinder 2 may be provided with an enlarged head portion 3A. In that case, the screw cylinder 2 may be screwed into any of the reinforcing bars 1 and 1A. .

図10,図11は、鉄筋継手2Aの変形例を示す。この例は図1〜図7に示した実施形態において、片方(図の左側)の鉄筋1Aの雄ねじ部1aの螺旋方向を、もう片方(図の右側)の鉄筋1の雄ねじ部1aの螺旋方向と逆方向として逆ねじとしてある。ねじ筒2は、軸方向の中央に対して両側に、互いに螺旋方向が逆となる雌ねじ部2a,2aを設けている。その他の構成は、図1〜図7に示す第1の実施形態と同様である。   10 and 11 show a modification of the reinforcing bar joint 2A. In this embodiment, in the embodiment shown in FIGS. 1 to 7, the spiral direction of the male thread 1a of the reinforcing bar 1A on one side (left side of the figure) is the spiral direction of the male thread part 1a of the reinforcing bar 1 on the other side (right side of the figure). And the reverse direction is as a reverse screw. The screw cylinder 2 is provided with female screw portions 2a and 2a whose spiral directions are opposite to each other on both sides with respect to the center in the axial direction. Other configurations are the same as those of the first embodiment shown in FIGS.

この実施形態の場合、接続作業として、ねじ筒2の両側から鉄筋1,1Aの雄ねじ部aを螺合させ、ねじ筒2の回転により両側の鉄筋1,1Aをねじ筒2内に引き込んで締結する。図7(A)のような一方の鉄筋1の雄ねじ部1aを、ねじ筒2内に、そのねじ込み側端と反対側の端部の付近までねじ込むことはできない。上記のように両側の鉄筋1,1Aをねじ筒2内に引き込んで締結することになり、またその引き込む鉄筋1,1Aは長いため、締結作業に大きな力が必要となる。しかし、用途によってはこのような逆ねじとした鉄筋継手も実用可能である。   In the case of this embodiment, as a connection work, the male screw portions a of the reinforcing bars 1 and 1A are screwed from both sides of the screw cylinder 2, and the reinforcing bars 1 and 1A on both sides are drawn into the screw cylinder 2 by the rotation of the screw cylinder 2 and fastened. To do. The male threaded portion 1a of one reinforcing bar 1 as shown in FIG. 7A cannot be screwed into the screw cylinder 2 to the vicinity of the end opposite to the screwed side end. As described above, the reinforcing bars 1 and 1A on both sides are drawn into the screw cylinder 2 and fastened, and since the drawn reinforcing bars 1 and 1A are long, a large force is required for fastening work. However, depending on the application, a rebar joint with such a reverse thread is also practical.

図12,図13は、鉄筋継手2Aのさらに他の変形例を示す。この例は図1〜図7に示した第1の実施形態において、ねじ筒2の軸方向の中央部分を、外径面が拡径した厚肉部2cとしたものである。厚肉部2cの軸方向に沿う断面の断面形状は、図示の例のように台形状としても、後述の図15の例のような円弧状としても良い。厚肉部2cの軸方向に垂直な断面における断面形状は、例えば図13(A)のように円形としても、また図13(B)のように8角形等の多角形としても良く、あるいは図示は省略するが、円形の一部を、一対の平行な面で切り落とした形状としても良い。多角形の場合、角数は偶数とするなど、直径方向の対向箇所に平行部分が生じる形状とすることが好ましい。   12 and 13 show still another modification of the reinforcing bar joint 2A. In this example, in the first embodiment shown in FIGS. 1 to 7, the central portion in the axial direction of the screw cylinder 2 is a thick portion 2c whose outer diameter surface is enlarged. The cross-sectional shape of the cross section along the axial direction of the thick portion 2c may be a trapezoidal shape as in the illustrated example or an arc shape as in the example of FIG. The cross-sectional shape in the cross section perpendicular to the axial direction of the thick part 2c may be, for example, a circle as shown in FIG. 13A, a polygon such as an octagon as shown in FIG. Although omitted, a part of a circle may be cut off by a pair of parallel surfaces. In the case of a polygon, it is preferable that the number of corners be an even number, for example, so that a parallel portion is formed at a diametrically opposed portion.

ねじ筒2には、軸方向の中央に至るに従って、各周の螺合部分a1 〜an で負担する引っ張り力が加算されることになり、軸方向の中央では、両側の鉄筋1,1A間の引っ張り力が全て作用することになる。しかし、この実施形態では、ねじ筒2の中央部分を厚肉部2cとしたため、ねじ筒2の中央部での強度不足の問題が解消される。厚肉部2aは強度の必要な中央部分だけであるため、ねじ筒2を構成する鋼材の無駄がない。ねじ筒2の上記厚肉部分2cは、外径側へ拡径させて設けるため、内径側へ膨らませる場合と異なり、ねじ筒2内に鉄筋1の雄ねじ部1aを、中央を超えて他端側までねじ込むことの障害とならない。そのため、厚肉部2cで施工性の低下を招くことがない。
また、厚肉部2cが、図13(B)の例のように多角形状とされ、あるいは前記のように平行面が形成されていると、厚肉部2cを、ねじ筒2を回すときの工具の当たり面とできて、ねじ筒2の締め込み作業性が向上する。
この実施形態におけるその他の構成,効果は、第1の実施形態と同様である。
As the screw tube 2 reaches the center in the axial direction, a tensile force borne by the screwed portions a1 to an of each circumference is added. In the center in the axial direction, the reinforcing bars 1 and 1A on both sides are connected. All the pulling force will act. However, in this embodiment, since the central part of the screw cylinder 2 is the thick part 2c, the problem of insufficient strength at the central part of the screw cylinder 2 is solved. Since the thick part 2a is only the central part which requires strength, there is no waste of the steel material constituting the screw cylinder 2. Since the thick portion 2c of the screw cylinder 2 is provided with an enlarged diameter toward the outer diameter side, unlike the case where it is expanded toward the inner diameter side, the male thread portion 1a of the reinforcing bar 1 is placed in the screw cylinder 2 at the other end beyond the center. It does not become an obstacle to screwing to the side. Therefore, the workability is not reduced in the thick portion 2c.
Further, when the thick part 2c is formed in a polygonal shape as in the example of FIG. 13B or a parallel surface is formed as described above, the thick part 2c is rotated when the screw cylinder 2 is turned. The contact surface of the tool can be used, and the tightening workability of the screw cylinder 2 is improved.
Other configurations and effects in this embodiment are the same as those in the first embodiment.

図14は、鉄筋継手21Aのさらに他の変形例を示す。この例では、図12の例において、ねじ筒2の両端にテーパ状部2aを設けずに、ねじ筒2の両端を円筒状としたものである。すなわち、ねじ筒2の外周面形状は、軸方向の中央部分を、外径面が拡径した厚肉部2cとしているが、その他の部分は全長に渡って円筒面状としている。その他の構成は図12の例と同様である。厚肉部2cの軸方向に沿う断面の断面形状は、台形状であるが、図15の例のような円弧状としても良い。また、厚肉部2cの軸方向に垂直な断面における断面形状は、図12の実施形態と同様に、図13(A)のような円形としても、また図13(B)のような8角形等の多角形としても良く、さらに、円形の一部を、一対の平行な面で切り落とした形状としても良い。多角形の場合、角数は偶数とするなど、直径方向の対向箇所に平行部分が生じる形状とすることが好ましい。   FIG. 14 shows still another modification of the reinforcing bar joint 21A. In this example, in the example of FIG. 12, both ends of the screw tube 2 are cylindrical without providing the tapered portions 2 a at both ends of the screw tube 2. That is, as for the outer peripheral surface shape of the screw cylinder 2, the central portion in the axial direction is a thick-walled portion 2c whose outer diameter surface is enlarged, while the other portions are cylindrical. Other configurations are the same as the example of FIG. The cross-sectional shape of the cross section along the axial direction of the thick portion 2c is a trapezoidal shape, but may be an arc shape as in the example of FIG. Further, the cross-sectional shape in the cross section perpendicular to the axial direction of the thick portion 2c may be a circle as shown in FIG. 13A or an octagon as shown in FIG. 13B, as in the embodiment of FIG. It is good also as polygons, such as etc. Furthermore, it is good also as a shape which cut off a part of circular shape by a pair of parallel surface. In the case of a polygon, it is preferable that the number of corners be an even number, for example, so that a parallel portion is formed at a diametrically opposed portion.

この変形例のように、ねじ筒2の中央に厚肉部2cを設けた場合は、図12の例につき前述したように、両側の鉄筋1,1A間に作用する引っ張り力が全て作用するねじ筒2の中央部における強度の不足の問題が解消される。厚肉部2aは強度の必要な中央部分だけであるため、ねじ筒2を構成する鋼材の無駄がない。また、厚肉部2cが、図13(B)の例のように多角形状とされ、あるいは前記のように平行面が形成されていると、厚肉部2cを、ねじ筒2を回すときの工具の当たり面とできて、ねじ筒2の締め込み作業性が向上する。   When the thick portion 2c is provided in the center of the screw cylinder 2 as in this modification, as described above with respect to the example of FIG. 12, the screw on which all the tensile forces acting between the reinforcing bars 1 and 1A on both sides act. The problem of insufficient strength at the center of the tube 2 is solved. Since the thick part 2a is only the central part which requires strength, there is no waste of the steel material constituting the screw cylinder 2. Further, when the thick part 2c is formed in a polygonal shape as in the example of FIG. 13B or a parallel surface is formed as described above, the thick part 2c is rotated when the screw cylinder 2 is turned. The contact surface of the tool can be used, and the tightening workability of the screw cylinder 2 is improved.

1,1A…鉄筋
1a…雄ねじ部
2…ねじ筒
2A…鉄筋継手
2a…雌ねじ部
2b…テーパ状部
2c…厚肉部
3…拡径頭部形成部品
3A…拡径頭部
DESCRIPTION OF SYMBOLS 1, 1A ... Reinforcing bar 1a ... Male thread part 2 ... Screw cylinder 2A ... Reinforcing bar joint 2a ... Female thread part 2b ... Tapered part 2c ... Thick part 3 ... Expanded head forming component 3A ... Expanded head

Claims (4)

両端に雄ねじ部を有する鉄筋と、この鉄筋の一端の雄ねじ部に雌ねじ部で螺合し前記鉄筋の一端に定着力付与用の拡径頭部を形成する拡径頭部形成部品と、内周面が雌ねじ部に形成されて一端で前記鉄筋の他端に螺合し、他端で他の鉄筋の端部の雄ねじ部に螺合して両鉄筋を接続するねじ筒とを備え、前記両端の雄ねじ部は、ねじ溝の溝底径が鉄筋の一般部分の外径に対して同径以上となる太径部とした頭部・継手付き鉄筋構造。   Reinforcing bars having male threaded portions at both ends, a diameter-enlarged head forming component that forms a diameter-enlarged head for imparting fixing force to one end of the reinforcing bars by screwing into a male threaded portion at one end of the reinforcing bar, and an inner circumference A screw cylinder having a surface formed in a female screw portion and screwed into one end of the reinforcing bar at one end and screwed into a male screw portion at the other end of the other reinforcing bar at the other end; The male screw part is a reinforcing bar structure with a head / joint that has a large diameter part with a groove bottom diameter equal to or larger than the outer diameter of the general part of the reinforcing bar. 請求項1において、前記両端に雄ねじを有する鉄筋における両端の雄ねじ部を、互いに同一の仕様とした頭部・継手付き鉄筋構造。   2. The reinforcing bar structure with head and joints according to claim 1, wherein the male screw portions at both ends of the reinforcing bar having male screws at both ends have the same specifications. 請求項1または請求項2において、前記ねじ筒の外周面のおける両端の軸方向の端部から雌ねじ部のねじ山の1山ないし複数山に渡る長さ範囲を、先細りとなるテーパ形状とした頭部・継手付き鉄筋構造。   In Claim 1 or Claim 2, the length range from the edge part of the axial direction of the both ends in the outer peripheral surface of the said screw cylinder to one or several threads of the thread of an internal thread part was made into the taper shape which tapers off. Rebar structure with head and joints. 請求項1ないし請求項3のいずれか1項において、前記ねじ筒の軸方向の中央部分を、外径面が拡径した厚肉部とした頭部・継手付き鉄筋構造。
4. The reinforcing bar structure with a head and joint according to claim 1, wherein a central portion in the axial direction of the screw cylinder is a thick wall portion whose outer diameter surface is enlarged. 5.
JP2009237160A 2009-10-14 2009-10-14 Reinforced structure with head and joint Pending JP2011084898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009237160A JP2011084898A (en) 2009-10-14 2009-10-14 Reinforced structure with head and joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009237160A JP2011084898A (en) 2009-10-14 2009-10-14 Reinforced structure with head and joint

Publications (1)

Publication Number Publication Date
JP2011084898A true JP2011084898A (en) 2011-04-28

Family

ID=44078046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009237160A Pending JP2011084898A (en) 2009-10-14 2009-10-14 Reinforced structure with head and joint

Country Status (1)

Country Link
JP (1) JP2011084898A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013157531A1 (en) * 2012-04-19 2013-10-24 Fukuda Akira Threaded reinforcing bar coupling for deformed reinforcing bar, and threaded deformed reinforcing bar
JP2014012990A (en) * 2013-10-25 2014-01-23 Tokai Corp Screw-type reinforcing-bar joint of deformed reinforcing-bar, and the threaded deformed reinforcing-bar

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013157531A1 (en) * 2012-04-19 2013-10-24 Fukuda Akira Threaded reinforcing bar coupling for deformed reinforcing bar, and threaded deformed reinforcing bar
JP2013221365A (en) * 2012-04-19 2013-10-28 Tokai Corp Screw type reinforcement joint for deformed bar, and deformed bar with screw
CN103827412A (en) * 2012-04-19 2014-05-28 福田章 Threaded reinforcing bar coupling for deformed reinforcing bar, and threaded deformed reinforcing bar
KR101570699B1 (en) * 2012-04-19 2015-11-20 아키라 후쿠다 Threaded reinforcing bar coupling for deformed reinforcing bar, and threaded deformed reinforcing bar
CN103827412B (en) * 2012-04-19 2016-05-25 福田章 The formula that the screws togather splice of deformed bar and establish threaded deformed bar
JP2014012990A (en) * 2013-10-25 2014-01-23 Tokai Corp Screw-type reinforcing-bar joint of deformed reinforcing-bar, and the threaded deformed reinforcing-bar

Similar Documents

Publication Publication Date Title
JP2011102488A (en) Screw type reinforcement joint for reinforcements different in diameter, and reinforced structure with the joint
KR20190067964A (en) Structural coupler
JP6359250B2 (en) Reinforcing bar structure and construction method of reinforcing bar structure
JP6359249B2 (en) Reinforcing bar structure and construction method of reinforcing bar structure
KR101123347B1 (en) Reinforcement binder mechanism
JP3160121U (en) Rebar and rebar joint
JP2011226071A (en) Reinforcement structure of structural member and reinforcement method thereof
JP2011084898A (en) Reinforced structure with head and joint
KR102105141B1 (en) Reinforcing bar coupler with tapered clamping structure
JP5344747B2 (en) Connection structure of steel column and beam concrete main reinforcement
JP2011001765A (en) Screw type reinforcement joint and connecting method thereof
JP2015134984A (en) Structure and method for joining reinforced concrete beam and reinforced concrete-filled steel pipe column together
JP4852377B2 (en) Reinforcing bar joint sleeve, joint using the sleeve, and reinforcing bar structure
JP5717983B2 (en) Member joining structure, building, and member joining method
JP7261658B2 (en) Method for joining precast concrete members
JP5370247B2 (en) Reinforcement structure and reinforcement method for H-shaped steel bolt joint joint
US11414867B2 (en) Rebar anchoring system and method
JP5369373B2 (en) Reinforcing bar fixing structure, reinforcing bar fixing method, PC member joining structure, PC member joining method
JP2023121246A (en) Acute angle screw node reinforcement and light-weight joint
WO2021014616A1 (en) Steel reinforced joint, steel reinforced assembly, and precast steel reinforced concrete body
KR100805167B1 (en) Steel bars splicing device
JP2009174126A (en) Mechanical joint for reinforcement
JP2012001936A (en) Frame erection method
JP2011174277A (en) Length regulating screw type reinforcement joint, manufacturing method therefor, and reinforcement structure with joint
CN111255162A (en) Semi-grouting sleeve assembly for fabricated building and construction method thereof