JP2011174277A - Length regulating screw type reinforcement joint, manufacturing method therefor, and reinforcement structure with joint - Google Patents

Length regulating screw type reinforcement joint, manufacturing method therefor, and reinforcement structure with joint Download PDF

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JP2011174277A
JP2011174277A JP2010038510A JP2010038510A JP2011174277A JP 2011174277 A JP2011174277 A JP 2011174277A JP 2010038510 A JP2010038510 A JP 2010038510A JP 2010038510 A JP2010038510 A JP 2010038510A JP 2011174277 A JP2011174277 A JP 2011174277A
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male screw
screw
joint
male
reinforcing bar
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廣三 ▲脇▼山
Kozo Wakiyama
Akira Fukuda
章 福田
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a length regulating screw type reinforcement joint which is manufactured easily with various lengths, copes with a length odd part when used in connection of a regular-sized reinforcement with both-end male screws or the like, and determines easily if the screw is screwed-in to a proper length visually. <P>SOLUTION: This length regulating screw type reinforcement joint 4 is a reinforcement joint interposed between ends of a pair of reinforcements 1, 1, to connect mutually the both reinforcements 1, 1, and includes one male screw component 7, and two screw barrels 6. The screw barrel 6 is screwed into over a male screw part 1a formed in an end part of the reinforcement 1 and respective ends of the male screw component 7. The male screw component 7 is formed with a male screw 7a in the outer circumference over the full length thereof, and has a male screw removal part 7b in a portion adjacent to a male screw portion 7aa screwed into the screw barrel 6. The male screw removal part 7b serves as an index indicating the propriety of a proper screwing-in amount. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、鉄筋コンクリート造の柱や梁等に用いられる長さ調整用ねじ式鉄筋継手およびその製造方法、並びに継手付き鉄筋構造に関する。   The present invention relates to a length-adjustable screw-type reinforcing bar joint used for reinforced concrete columns and beams, a manufacturing method thereof, and a reinforcing bar structure with a joint.

鉄筋コンクリート造の柱や梁において、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 columns and beams, various types of reinforcing bar joints are used in order to make a limited standard length of reinforcing bars 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. However, lap joints have a complicated bar arrangement structure due to overlapping. 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.

ねじ式鉄筋継手は、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。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 reinforcing bar joint has an 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. 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.

また、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2)。この工法は、機械式鉄筋定着方式と呼ばれている。   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 be firmly fixed 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 an enlarged diameter at an end portion to give a fixing strength in place of a bent portion (for example, Patent Document 2). This construction method is called a mechanical rebar fixing method.

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

ねじ式鉄筋継手を採用する場合、鉄筋の端部に雄ねじ部を形成することが必要となる。この雄ねじ部の形成には、強度確保のため、鉄筋端部を加熱および圧縮の付与によって拡径させ、その拡径部分にねじ溝を切ることが必要になる。または、鉄筋の一般部分よりも大径の丸鋼にねじを切った雄ねじ部品を製造し、この雄ねじ部品を鉄筋の端部に圧接するなどの処理が必要となる。これらの拡径処理や、圧接には、精度,信頼性確保のために、大がかりな設備が必要であって、専用の工場で行う必要があり、生産性確保も難しい。   When a threaded reinforcing bar joint is employed, it is necessary to form a male threaded portion at the end of the reinforcing bar. In order to secure the strength, it is necessary to increase the diameter of the end of the reinforcing bar by applying heat and compression, and to cut a thread groove in the expanded diameter portion. Alternatively, it is necessary to manufacture a male threaded part in which a round steel bar having a diameter larger than that of the general part of the reinforcing bar is cut and press the male threaded part against the end of the reinforcing bar. These diameter expansion processing and pressure welding require large-scale equipment to ensure accuracy and reliability, and it is necessary to carry out in a dedicated factory, and it is difficult to secure productivity.

そのため、本発明者等は、鉄筋径毎に、両端に雄ねじ部を有する数種類の長さの定尺の鉄筋を標準化して準備しておき、これを現場に搬入して用いることを考えた。また、本発明者等は、鉄筋の定着用の頭部をねじ部品とすることを考えた。   For this reason, the present inventors have standardized and prepared several types of length-sized reinforcing bars having male threaded portions at both ends for each reinforcing bar diameter, and considered to carry them in the field and use them. In addition, the present inventors have considered that the head for fixing the reinforcing bar is a screw part.

しかし、建物毎や、柱、梁毎に、連続させる鉄筋の長さが異なり、定尺の鉄筋の組み合わせでは、必要な長さに合わせることができない。一部の鉄筋のみを、設置部位に応じた個別生産品とすることで対応は可能であるが、その個別生産品の雄ねじ付きの鉄筋の生産に手間がかかり、コスト高となる。なお、定尺の鉄筋を使用する場合に、7mもので0〜40mmの長さ公差が建築基準で認められているが、現場配筋では、この調整に手間取り、全長を見ながら継手部の余裕をどの程度にするかにつき、煩雑な手間を要している。   However, the length of the continuous reinforcing bar differs for each building, column, and beam, and it cannot be adjusted to the required length with a combination of standard reinforcing bars. Although it is possible to cope with only some of the reinforcing bars by making them individually manufactured products according to the installation site, it takes time and effort to produce the reinforcing bars with external threads of the individually manufactured products, resulting in high costs. In addition, when using standard reinforcing bars, a length tolerance of 0 to 40 mm is recognized by the building standards for 7m, but in the case of on-site reinforcement, there is a margin of the joint part while taking time for this adjustment and checking the total length. It takes a lot of time and effort to determine how much to achieve.

また、ねじ式鉄筋継手は、ねじ筒に対して雄ねじ部を適正長さ分だけねじ込むことが、接続強度の確保のために必要であるが、現場で雄ねじ部を適正長さ分だけねじ込んだか否かの判断をすることが難しい。   For threaded steel rebar joints, it is necessary to secure the connection strength by screwing the male screw part into the screw cylinder by an appropriate length. It is difficult to make a judgment.

この発明の目的は、種々の長さに製造することが容易で、定尺の両端雄ねじ付き鉄筋等を接続して使用する場合の長さ半端部の対処が容易に行え、また適正長さまでねじ込んだか否かの判断が目視により容易に行える長さ調整用ねじ式鉄筋継手、およびその製造方法を提供ことである。
この発明の他の目的は、複数のねじ式鉄筋継手を用いて複数本の鉄筋を順次接続した継手付き鉄筋構造において、両端に雄ねじ部を有する定尺の鉄筋を用いても、全長を容易に希望の長さにできるようにすることである。
The object of the present invention is that it can be easily manufactured in various lengths, and it can easily handle the half-length portion when connecting and using a fixed-length male threaded rebar, etc., and can be screwed to an appropriate length. It is to provide a length-adjustable threaded steel rebar joint that can be easily determined visually, and a method for manufacturing the same.
Another object of the present invention is to provide a jointed reinforcing bar structure in which a plurality of reinforcing bars are sequentially connected using a plurality of threaded reinforcing bar joints. It is to be able to make it to the desired length.

この発明の長さ調整用ねじ式鉄筋継手は、一対の鉄筋の端部間に介在して両鉄筋を相互に接続する鉄筋継手であって、1本の雄ねじ部品と、2個のねじ筒とを備える。これらねじ筒は、内周に全長に渡る雌ねじを有し、前記各鉄筋の端部に形成された雄ねじ部とこれら雄ねじ部に対向する前記雄ねじ部品の各端部とに渡って螺合するものである。前記雄ねじ部品は、全長に渡って外周に雄ねじが形成され、前記ねじ筒に螺合する雄ねじ部分に隣接する箇所に、前記雄ねじが除去された雄ねじ除去部を有する。この雄ねじ除去部は、この雄ねじ除去部よりも端側の雄ねじ部分の全体が前記ねじ筒内に隠れるまでねじ込まれることで適正ねじ込み量であることを示す指標となるものとする。   The screw rebar joint for length adjustment according to the present invention is a rebar joint that is interposed between ends of a pair of rebars and connects the two rebars to each other, and includes one male screw component, two screw cylinders, Is provided. These screw cylinders have internal threads over the entire length on the inner periphery, and are screwed over the male screw portions formed at the end portions of the reinforcing bars and the end portions of the male screw components facing the male screw portions. It is. The male screw component has a male screw removing portion from which a male screw is formed on the outer periphery over the entire length and the male screw is removed at a location adjacent to a male screw portion screwed into the screw cylinder. The male screw removing portion serves as an index indicating an appropriate screwing amount by being screwed in until the entire male screw portion on the end side of the male screw removing portion is hidden in the screw cylinder.

この構成によると、1本の雄ねじ部品とその両端にねじ込まれる2個のねじ筒とでなるため、雄ねじ部品の長さを種々異ならせることで、両側の鉄筋の端部間の長さに適合したものとできる。前記雄ねじ部品は、全長に渡って外周に雄ねじが形成されたものであるため、全長に渡って雄ねじが形成された長尺のねじ棒を準備しておいて、希望の長さに切断することで製造できる。雄ねじ除去部は、雄ねじを削り取る等の加工により容易に形成できる。このように、種々の長さに製造することが容易で、定尺の両端雄ねじ付き鉄筋等を接続して使用する場合の長さ半端部の対処が容易に行える。雄ねじ部品は、中間部分が丸棒状であると、異形鉄筋に比べてコンクリートへの付着面積が少なくなる欠点を生じるが、この発明では、全長に渡って外周に雄ねじを形成したため、雄ねじによってコンクリートへの付着面積が増えるという利点が得られる。また、雄ねじ部品には雄ねじ除去部を設け、この雄ねじ除去部よりも端側の雄ねじ部分の全体が前記ねじ筒内に隠れるまでねじ込まれることで適正ねじ込み量であることを示す指標としたため、端側の雄ねじ部分がねじ筒内に隠れたか否かを見るだけで、適正ねじ込み量までねじ込まれたか否かを判断することができる。この指標は雄ねじを除去した部分であるため、視覚的にも明確であり、また簡単に加工することができる。また、ねじ式鉄筋継手であるため、接続作業性に優れ、グラウト注入式の特殊継手等と比べて施工期間も短縮される。重ね継手と比べると配筋が簡素化される。   According to this configuration, since it consists of one male screw part and two screw cylinders screwed into both ends, it can be adapted to the length between the ends of the reinforcing bars on both sides by varying the length of the male screw part. You can do it. Since the male screw part has a male screw formed on the outer periphery over the entire length, a long screw rod with a male screw formed over the entire length is prepared and cut to a desired length. Can be manufactured. The male screw removing portion can be easily formed by processing such as scraping off the male screw. Thus, it is easy to manufacture in various lengths, and it is possible to easily deal with the half-length portion when using a fixed-length double-end male threaded reinforcing bar or the like. The male threaded part has a disadvantage that the adhesion area to the concrete is smaller than the deformed reinforcing bar if the middle part is a round bar shape. However, in the present invention, the male thread is formed on the outer periphery over the entire length. The advantage of increasing the adhesion area of is obtained. In addition, the male screw part is provided with a male screw removing portion, and the end of the male screw portion on the end side than the male screw removing portion is used as an index indicating that it is an appropriate screwing amount by being screwed in until it is hidden in the screw cylinder. It is possible to determine whether or not the screw has been screwed up to an appropriate screwing amount simply by checking whether or not the male screw portion on the side is hidden in the screw cylinder. Since this index is a portion from which the male screw is removed, it is visually clear and can be easily processed. Moreover, since it is a screw-type reinforcing bar joint, it is excellent in connection workability, and the construction period is shortened compared with a grout injection type special joint or the like. The bar arrangement is simplified compared to the lap joint.

前記雄ねじ部品は、前記雄ねじが転造ねじであっても良い。転造ねじであると、全長に渡って雄ねじが形成された長尺のねじ棒が容易に製造でき、この長さ調整用ねじ式鉄筋継手の製造がより一層簡単になる。   In the male screw component, the male screw may be a rolled screw. When it is a rolled screw, a long screw rod having a male screw formed over its entire length can be easily manufactured, and the manufacture of this length-adjustable threaded steel rebar joint becomes even easier.

この発明の長さ調整用ねじ式鉄筋継手の製造方法は、この発明の上記いずれかの構成の長さ調整用ねじ式鉄筋継手を製造する方法であって、前記雄ねじ部品を製造する過程として、全長に渡って雄ねじが形成されたねじ棒を準備する過程と、このねじ棒から希望の長さの雄ねじ部品素材を切断して得る過程と、この雄ねじ部品素材に前記雄ねじ除去部を加工して前記雄ねじ部品とする過程とを含む。
この製造方法によると、全長に渡って雄ねじが形成されたねじ棒を準備し、このねじ棒から希望の長さの雄ねじ部品素材を切断して雄ねじ部品とするため、任意の長さの長さ調整用ねじ式鉄筋継手を容易に製造することができる。
The method for producing a length-adjustable threaded reinforcing bar joint according to the present invention is a method for producing a length-adjustable threaded reinforcing bar joint according to any one of the above-described configurations of the present invention. The process of preparing a screw rod having a male thread formed over its entire length, the process of obtaining a male screw component material of a desired length from this screw rod, and processing the male screw removal portion on this male screw component material A process of forming the male screw part.
According to this manufacturing method, a screw rod having a male screw formed over its entire length is prepared, and a male screw component material having a desired length is cut from the screw rod to obtain a male screw component. A threaded reinforcing bar joint for adjustment can be easily manufactured.

この発明の継手付き鉄筋構造は、複数本の鉄筋を、鉄筋継手を介して順次接続した継手付き鉄筋構造であって、前記鉄筋継手が複数箇所に設けられ、これら複数の鉄筋継手を、それぞれ各鉄筋の端部に設けられた雄ねじ部およびこの雄ねじ部に螺合する雌ねじが形成されたねじ筒を有する継手であるねじ式鉄筋継手とし、これら複数のねじ式鉄筋継手のうちの少なくとも一つを、この発明の上記いずれかの構成の長さ調整用ねじ式鉄筋継手とし、前記各鉄筋を両端に雄ねじ部を有するものとする。
この構成によると、各鉄筋は全てねじ式鉄筋継手で接続するため、配筋が簡素にでき、また接続作業性に優れ、施工期間短縮の短縮が図れる。また、複数のねじ式鉄筋継手のうちの少なくとも一つを、この発明の上記いずれかの構成の長さ調整用ねじ式鉄筋継手とするため、両端に雄ねじ部を有する定尺の鉄筋を用いても、全長を容易に希望の長さにすることができる。
The rebar structure with a joint of the present invention is a rebar structure with a joint in which a plurality of rebars are sequentially connected via a rebar joint, and the rebar joints are provided at a plurality of locations. A threaded rebar joint, which is a joint having a male thread portion provided at an end of a rebar and a screw cylinder formed with a female thread to be screwed into the male thread portion, and at least one of the plurality of threaded rebar joints The length-adjustable screw-type reinforcing bar joint according to any one of the above-described configurations of the present invention is provided, and each of the reinforcing bars has male screw portions at both ends.
According to this configuration, since all the reinforcing bars are connected by screw-type reinforcing bar joints, the bar arrangement can be simplified, the connection workability is excellent, and the construction period can be shortened. Moreover, in order to make at least one of the plurality of screw-type reinforcing bar joints into a length-adjusting screw-type reinforcing bar joint of any one of the above-described configurations of the present invention, a fixed-length reinforcing bar having male screw portions at both ends is used However, the total length can be easily set to a desired length.

この発明の長さ調整用ねじ式鉄筋継手は、一対の鉄筋の端部間に介在して両鉄筋を相互に接続する鉄筋継手であって、1本の雄ねじ部品と、2個のねじ筒とを備え、これらねじ筒は、内周に全長に渡る雌ねじを有し、前記各鉄筋の端部に形成された雄ねじ部とこれら雄ねじ部に対向する前記雄ねじ部品の各端部とに渡って螺合するものであり、前記雄ねじ部品は、全長に渡って外周に雄ねじが形成され、前記ねじ筒に螺合する雄ねじ部分に隣接する箇所に、前記雄ねじが除去された雄ねじ除去部を有し、この雄ねじ除去部は、この雄ねじ除去部よりも端側の雄ねじ部分の全体が前記ねじ筒内に隠れるまでねじ込まれることで適正ねじ込み量であることを示す指標となるため、種々の長さに製造することが容易で、定尺の両端雄ねじ付き鉄筋等を接続して使用する場合の長さ半端部の対処が容易に行え、また適正長さまでねじ込んだか否かの判断を目視により容易に行うことができる。さらに雄ねじ部品は、全長に渡って外周に雄ねじを形成したため、雄ねじによってコンクリートへの付着面積が増えるという利点が得られる。   The screw rebar joint for length adjustment according to the present invention is a rebar joint that is interposed between ends of a pair of rebars and connects the two rebars to each other, and includes one male screw component, two screw cylinders, These screw cylinders have internal threads extending over the entire length on the inner periphery, and are threaded over the male screw parts formed at the end parts of the reinforcing bars and the end parts of the male screw parts facing the male screw parts. The male screw component has a male screw removing portion from which the male screw is removed at a location adjacent to the male screw portion screwed into the screw cylinder, the male screw being formed on the outer periphery over the entire length, The male screw removing portion is an index indicating that the amount of screwing is appropriate by screwing in until the entire male screw portion on the end side of the male screw removing portion is hidden in the screw cylinder, and thus is manufactured in various lengths. Easy to do, rebar with male thread on both ends, etc. Action length odd unit when used in connection easily performed, also it can be easily performed visually screwed it determines whether or not to a proper length. Furthermore, since the external thread part formed the external thread on the outer periphery over the full length, the advantage that the adhesion area to concrete increases with an external thread is acquired.

この発明の長さ調整用ねじ式鉄筋継手の製造方法は、前記雄ねじ部品を製造する過程として、全長に渡って雄ねじが形成されたねじ棒を準備する過程と、このねじ棒から希望の長さの雄ねじ部品素材を切断して得る過程と、この雄ねじ部品素材に前記雄ねじ除去部を加工して前記雄ねじ部品とする過程とを含む方法であるため、この発明の長さ調整用ねじ式鉄筋継手を容易に製造することができる。   The method of manufacturing the length-adjustable threaded steel bar joint according to the present invention includes a step of preparing a screw rod having a male screw formed over its entire length as a process of manufacturing the male screw component, and a desired length from the screw rod. This is a method that includes a process of cutting the male screw part material and a process of processing the male screw removing portion into the male screw part material to form the male screw part. Can be easily manufactured.

この発明の継手付き鉄筋構造は、複数本の鉄筋を、鉄筋継手を介して順次接続した継手付き鉄筋構造であって、前記鉄筋継手が複数箇所に設けられ、これら複数の鉄筋継手を、それぞれ各鉄筋の端部に設けられた雄ねじ部およびこの雄ねじ部に螺合する雌ねじが形成されたねじ筒を有する継手であるねじ式鉄筋継手とし、これら複数のねじ式鉄筋継手のうちの少なくとも一つを、この発明の上記いずれかの構成の長さ調整用ねじ式鉄筋継手とし、前記各鉄筋を両端に雄ねじ部を有するものとしたため、両端に雄ねじ部を有する定尺の鉄筋を用ても、全長を容易に希望の長さにすることができる。   The rebar structure with a joint of the present invention is a rebar structure with a joint in which a plurality of rebars are sequentially connected via a rebar joint, and the rebar joints are provided at a plurality of locations. A threaded rebar joint, which is a joint having a male thread portion provided at an end of a rebar and a screw cylinder formed with a female thread to be screwed into the male thread portion, and at least one of the plurality of threaded rebar joints Since the length-adjustable threaded steel rebar joint of any of the above-described configurations of the present invention and each of the rebars has a male threaded portion at both ends, the full length can be obtained even if a fixed-length rebar having a male threaded portion at both ends is used. Can be easily made to the desired length.

この発明の一実施形態に係る長さ調整用ねじ式鉄筋継手の断面図である。1 is a cross-sectional view of a length-adjusting threaded reinforcing bar joint according to an embodiment of the present invention. 同長さ調整用ねじ式鉄筋継手の製造方法を示す工程説明図である。It is process explanatory drawing which shows the manufacturing method of the screw type reinforcing steel joint for length adjustment. 同長さ調整用ねじ式鉄筋継手におけるねじ筒の各種の例の断面図である。It is sectional drawing of the various examples of the screw cylinder in the screw-type reinforcing bar joint for the same length adjustment. 同長さ調整用ねじ式鉄筋継手と接続するねじ付き定尺鉄筋の例の説明図である。It is explanatory drawing of the example of a threaded fixed bar connected with the screw-type reinforcing bar joint for the same length adjustment. 同鉄筋の雄ねじ部の拡大正面である。It is an expansion front of the external thread part of the same reinforcing bar. 同長さ調整用ねじ式鉄筋継手を用いた鉄筋コンクリート柱の配筋説明図、並びにその同配筋に用いる各種の鉄筋継手等の説明図である。It is explanatory drawing of the reinforcement arrangement | positioning of the reinforced concrete pillar using the screw-type reinforcement joint for the same length adjustment, and various reinforcement joints used for the reinforcement arrangement. 同鉄筋コンクリート柱の拡大断面図である。It is an expanded sectional view of the reinforced concrete pillar. 同長さ調整用ねじ式鉄筋継手を用いる鉄筋コンクリート梁の配筋説明図である。It is a bar arrangement explanatory view of a reinforced concrete beam using the same length adjusting screw-type reinforcing bar joint.

この発明の一実施形態に係る長さ調整用ねじ式鉄筋継手を図面と共に説明する。図1に示すように、この長さ調整用ねじ式鉄筋継手4は、一対の鉄筋1,1の端部間に介在して両鉄筋1,1を相互に接続する鉄筋継手であって、1本の雄ねじ部品7と、2個のねじ筒6とを備える。ねじ筒6は、内周に全長に渡る雌ねじ6aを有し、前記各鉄筋1の端部に形成された雄ねじ部1aとこれら雄ねじ部1aに対向する前記雄ねじ部品7の各端部とに渡って螺合するものである。雄ねじ部品7は、全長に渡って外周に雄ねじ7aが形成され、ねじ筒6に螺合する雄ねじ部分7aaに隣接する箇所に、前記雄ねじ7aが除去された部分である雄ねじ除去部7bを有する。この雄ねじ除去部7bは、前記雄ねじ7aにおける、雄ねじ除去部7bよりも端側の雄ねじ部分7aaの全体がねじ筒6内に隠れるまでねじ込まれることで適正ねじ込み量であることを示す指標となるものである。   A length-adjustable threaded reinforcing bar joint according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, this length-adjusting threaded reinforcing bar joint 4 is a reinforcing bar joint that is interposed between the ends of a pair of reinforcing bars 1 and 1 and connects the two reinforcing bars 1 and 1 to each other. A male screw part 7 and two screw cylinders 6 are provided. The screw cylinder 6 has a female screw 6a extending over the entire length on the inner periphery, and extends to the male screw portion 1a formed at the end portion of each reinforcing bar 1 and each end portion of the male screw component 7 facing the male screw portion 1a. Screwed together. The male screw component 7 has a male screw 7a formed on the outer periphery over its entire length, and has a male screw removing portion 7b that is a portion from which the male screw 7a has been removed at a location adjacent to the male screw portion 7aa that is screwed into the screw cylinder 6. The male screw removing portion 7b serves as an index indicating an appropriate screwing amount by screwing in the male screw 7a until the whole of the male screw portion 7aa on the end side of the male screw removing portion 7b is hidden in the screw cylinder 6. It is.

各ねじ筒6は、詳しくは、鋼製のスリーブの内周面に、全長に渡って一様な雌ねじ6aを、ねじ切り加工で形成したものである。ねじ筒6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6の外周の断面形状は、例えば図3(A)のように円形であっても、同図(B)のように6〜8角形等の多角形であっても良い。多角形であれば、工具を係合させることができて、ねじ締め作業が容易である。ねじ筒6は、軸方向の中央など、一部のみに外周が多角形の部分を形成したものであっても良い。   Specifically, each screw cylinder 6 is formed by threading a female screw 6a 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 6 is a thick steel pipe that is cut for each length of the screw cylinder, or while 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 cross-sectional shape of the outer periphery of the screw cylinder 6 may be, for example, a circle as shown in FIG. 3A or a polygon such as a 6-8 octagon as shown in FIG. If it is a polygon, a tool can be engaged and screwing work is easy. The screw cylinder 6 may be formed by forming a polygonal outer peripheral portion at only a part, such as the center in the axial direction.

ねじ筒6の全長は、雄ねじ部品7の雄ねじ部分7aaと鉄筋1の雄ねじ部1aとが、互いに干渉しない程度の隙間を介して近接するまでねじ込まれた状態で、雄ねじ部分7aaの端縁がねじ筒6の端縁と一致する程度の長さか、または雌ねじ6a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6の長さは、鉄筋1の雄ねじ部1aの長さと雄ねじ部品7の雄ねじ部分7aaの長さを加えた長さよりも十分に長くしても良い。   The total length of the screw cylinder 6 is such that the male screw part 7aa of the male screw part 7 and the male screw part 1a of the reinforcing bar 1 are screwed in close to each other through a gap that does not interfere with each other, and the edge of the male screw part 7aa is screwed. The length is equal to the end edge of the cylinder 6 or the length is such that an unthreaded portion of about one round is left on the opening edge of the female screw 6a. In the illustrated example, an unthreaded portion of about one turn is left behind. Note that the length of the screw cylinder 6 may be sufficiently longer than the length obtained by adding the length of the male screw portion 1 a of the reinforcing bar 1 and the length of the male screw portion 7 aa of the male screw component 7.

鉄筋1は、図4に示すように、両端に雄ねじ部1aを有する両端雄ねじ付き鉄筋とされる。この両端雄ねじ付きの鉄筋1aは、各種の鉄筋径毎に、互いに種々長さの異なる複数種類の定尺物として準備され、その準備された中から、任意の長さの鉄筋1が選択して使用される。この定尺物として準備する両端雄ねじ付きの鉄筋1の種類は、例えば、通常に市販されている定尺の鉄筋の長さ毎であり、例を挙げると、3.5m〜12mの範囲で、500mm毎のピッチのものとされる。雄ねじ部1aは、鉄筋1の長さが異なっていても、各径毎に同じ仕様とされる。   As shown in FIG. 4, the reinforcing bar 1 is a double-ended male threaded reinforcing bar having male threaded portions 1a at both ends. This rebar 1a with a male screw at both ends is prepared as a plurality of types of standard objects having different lengths for each rebar diameter, and the rebar 1 of any length is selected from the prepared ones. used. The types of rebar 1 with both ends male thread to be prepared as this standard object are, for example, each length of a standard rebar that is usually marketed. For example, in the range of 3.5 m to 12 m, The pitch is every 500 mm. The male screw portion 1a has the same specifications for each diameter even if the length of the reinforcing bar 1 is different.

各鉄筋1は、例えば図5に示すように、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く、またこのような突条を有しない円形断面の鉄筋であっても良い。同図に示すように、各鉄筋1の雄ねじ部1aは、鉄筋の一般部分よりも拡径した拡径形状とされる。詳しくは、雄ねじ部1aは、ねじ溝の溝底径d3を、鉄筋1,1Aの一般部分の外径d1に対して同径以上とする。鉄筋1が同図のような突条1c,1d等を有する異形鉄筋の場合は、溝底径d3が鉄筋1,1A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1c,1dを含む外径d2に対して同等以上とすることが好ましい。   For example, as shown in FIG. 5, each reinforcing bar 1 may be a deformed reinforcing bar having projecting portions such as a semicircular ridge 1c and an axial ridge 1d, or a circular cross section without such a ridge. Reinforcing bars may be used. As shown in the figure, the male thread portion 1a of each reinforcing bar 1 has a diameter-expanded shape that is larger than the general part of the reinforcing bar. Specifically, in the male screw portion 1a, the groove bottom diameter d3 of the screw groove is equal to or larger than the outer diameter d1 of the general portion of the reinforcing bars 1 and 1A. When the reinforcing bar 1 is a deformed reinforcing bar having protrusions 1c and 1d as shown in the figure, the groove bottom diameter d3 is equivalent to the outer diameter d1 of the portion of the reinforcing bars 1 and 1A excluding the protrusions 1c and 1d. Although it may be above, it is preferable to make it equal to or greater than the outer diameter d2 including the protrusions 1c and 1d as in the example of FIG.

鉄筋1の雄ねじ部1aのピッチ円直径d4(=2r)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。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d4(=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d4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7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が柱や梁の主筋である場合、鉄筋1の周辺にフープやスターラップ等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ねじ筒6が干渉することが、回避され易くなる。   The pitch circle diameter d4 (= 2r) of the male thread portion 1a of the reinforcing bar 1 is preferably increased within a range where no other trouble occurs. 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 force transmission capability of the screw depends on the screw groove length, the axial length l of the male screw portion 1a is greatly increased by increasing the pitch circle diameter d4 (= 2r) to obtain the same screw groove length. Becomes shorter. Further, when the pitch circle diameter d4 is increased, the male screw 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 7 can be shortened, and interference with the surrounding bar arrangement of the reinforcing bar 1 can be avoided. For example, when the reinforcing bar 1 is the main reinforcing bar of a column or a beam, many reinforcing bars such as hoops and stirrups are provided around the reinforcing bar 1, but the screw tube 6 may interfere with such reinforcing bars. Easier to avoid.

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.

雄ねじ部品7は、鋼棒の外周に、鉄筋1の雄ねじ部1aと同じ径で同じリードの雄ねじ7aを全長に渡って形成したものである。雄ねじ7aは、転造により形成しても、切削加工により形成しても良い。雄ねじ除去部7bは、雄ねじ7aにおける2〜4山程度、例えば3山分のねじ山を、旋削等の切削加工により除去した部分である。
なお、雄ねじ部7aおよび鉄筋1の雄ねじ1a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、矩形状、曲面形状等であっても良い。
The male screw part 7 is formed by forming a male screw 7a having the same diameter and the same lead as the male screw part 1a of the reinforcing bar 1 over the entire length on the outer periphery of the steel rod. The male screw 7a may be formed by rolling or may be formed by cutting. The male screw removing portion 7b is a portion in which about 2 to 4 threads, for example, 3 threads of the male thread 7a are removed by a cutting process such as turning.
In addition, although the cross-sectional shape of the thread groove and the screw thread of the external thread part 7a and the external thread 1a of the reinforcing bar 1 is a triangular shape in the illustrated example, it may be a trapezoidal shape, a rectangular shape, a curved surface shape, or the like.

雄ねじ部品7の製造過程を、図2と共に説明する。まず、同図(A)のように、全長に渡って雄ねじS7aが形成されたねじ棒S7を準備する。このねじ棒S7は、例えば丸棒状の鋼棒から転造により雄ねじS7aを形成したものである。このねじ棒S7から、建物の柱や梁等の配筋設計等に応じて、希望の長さの雄ねじ部品素材W7を切断して得る(B)。雄ねじ部品素材W7は、1本のねじ棒S7から、例えば数本ないし十数本程度得る。このように切断して得た雄ねじ部品素材S7に、前記雄ねじ除去部7bを加工して前記雄ねじ部品7とする(C)。このように製造した雄ねじ部品7に一対のねじ筒6を螺合させ、長さ調整用ねじ式鉄筋継手4とする(D)。この長さ調整用ねじ式鉄筋継手4に、両側の鉄筋1を接続する。   The manufacturing process of the male screw part 7 will be described with reference to FIG. First, as shown in FIG. 3A, a screw rod S7 having a male screw S7a formed over its entire length is prepared. This threaded rod S7 is obtained by forming a male thread S7a by rolling from, for example, a round steel bar. From this threaded rod S7, a male threaded part material W7 having a desired length is obtained by cutting according to the bar arrangement design of the pillars and beams of the building (B). The male screw component material W7 is obtained, for example, from several to a dozen or more from one screw rod S7. The male screw removing material 7b is processed into the male screw component material S7 obtained by cutting in this way to obtain the male screw component 7 (C). A pair of screw cylinders 6 are screwed into the male screw part 7 manufactured in this way, and a length-adjustable threaded steel rebar joint 4 is obtained (D). Reinforcing bars 1 on both sides are connected to this length-adjusting screw-type reinforcing bar joint 4.

この長さ調整用ねじ式鉄筋継手4を用いて接続するに際しては、同図(D)に鎖線で示すように、ねじ筒2の全体が雄ねじ部品7から突出しない位置までねじ込んでおく。鉄筋1の端部と対応する位置に長さ調整用ねじ式鉄筋継手4を位置させた後、ねじ筒2をねじ戻し、同図(E)のように、ねじ筒2を鉄筋1の雄ねじ部1aに螺合させる。このとき、雄ねじ部品7の端部の雄ねじ部分7aaの全体がねじ筒2に隠れた状態が維持され、雄ねじ部品7の雄ねじ除去部7bの略全体がねじ筒2から露出する程度までねじ戻す。これにより、雄ねじ部品7とねじ筒2とは適切なねじ込み量となる。   When connecting using this length-adjustable threaded steel rebar joint 4, the entire screw cylinder 2 is screwed into a position where it does not protrude from the male screw part 7 as indicated by a chain line in FIG. After the length-adjusting threaded reinforcing bar joint 4 is positioned at a position corresponding to the end of the reinforcing bar 1, the screw cylinder 2 is unscrewed, and the screw cylinder 2 is connected to the male threaded part of the reinforcing bar 1 as shown in FIG. Screw onto 1a. At this time, the state where the entire male screw portion 7aa at the end of the male screw component 7 is hidden by the screw cylinder 2 is maintained, and the screw is returned to the extent that substantially the entire male screw removing portion 7b of the male screw component 7 is exposed from the screw cylinder 2. Thereby, the external thread part 7 and the screw cylinder 2 become an appropriate screwing amount.

この構成の長さ調整用ねじ式鉄筋継手1によると、1本の雄ねじ部品7とその両端にねじ込まれる2個のねじ筒6とでなるため、雄ねじ部品7の長さを種々異ならせることで、両側の鉄筋1の端部間の長さに適合したものとできる。前記雄ねじ部品7は、全長に渡って外周に雄ねじ7aが形成されたものであるため、全長に渡って雄ねじS7aが形成された長尺のねじ棒S7を準備しておいて、希望の長さに切断することで製造できる。雄ねじ除去部7bは、雄ねじ7aを削り取る等の加工により容易に形成できる。このように、種々の長さに製造することが容易で、定尺の両端雄ねじ付き鉄筋1等を接続して使用する場合に、全長に対して長さが中途半端となる部分の対処が容易に行える。雄ねじ部品7は、中間部分が丸棒状であると、異形鉄筋に比べてコンクリートへの付着面積が少なくなる欠点を生じるが、この実施形態では、全長に渡って外周に雄ねじ7aを形成したため、雄ねじ7aによってコンクリートへの付着面積が増えるという利点が得られる。   According to the length-adjustable threaded steel rebar joint 1 of this configuration, since it consists of one male screw part 7 and two screw cylinders 6 screwed into both ends thereof, the length of the male screw part 7 can be varied. It can be adapted to the length between the ends of the reinforcing bars 1 on both sides. Since the male screw part 7 has a male screw 7a formed on the outer periphery over the entire length, a long screw rod S7 having a male screw S7a formed over the entire length is prepared, and the desired length is obtained. It can be manufactured by cutting into pieces. The male screw removing portion 7b can be easily formed by processing such as scraping off the male screw 7a. Thus, it is easy to manufacture in various lengths, and when connecting and using a fixed-length double-end male threaded rebar 1 or the like, it is easy to deal with a portion whose length is halfway with respect to the entire length. Can be done. If the male screw part 7 has a round bar shape in the middle part, it has a disadvantage that the adhesion area to the concrete is smaller than that of the deformed reinforcing bar. However, in this embodiment, the male screw 7a is formed on the outer periphery over the entire length. 7a provides the advantage of increasing the adhesion area to the concrete.

また、雄ねじ部品7には雄ねじ除去部7bを設け、この雄ねじ除去部7bよりも端側の雄ねじ部分7aの全体がねじ筒6内に隠れるまでねじ込まれることで適正ねじ込み量であることを示す指標としたため、端側の雄ねじ部分7aaがねじ筒内に隠れたか否かを見るだけで、適正ねじ込み量までねじ込まれたか否かを判断することができる。そのため、現場で迅速に判断することができる。この指標は雄ねじ7aを除去した部分であるため、視覚的にも明確であり、また簡単に加工することができる。
ねじ式鉄筋継手であるため、接続作業性に優れ、グラウト注入式の特殊継手等と比べて施工期間も短縮され、重ね継手と比べると配筋が簡素化されるという利点も得られる。雄ねじ部品7を転造ねじとした場合は、その素材となる、全長に渡って雄ねじS7aが形成された長尺のねじ棒S7が容易に製造でき、この長さ調整用ねじ式鉄筋継手4の製造がより一層簡単になる。
Further, the male screw part 7 is provided with a male screw removing portion 7b, and an index indicating that an appropriate screwing amount is obtained by screwing in until the entire male screw portion 7a on the end side of the male screw removing portion 7b is hidden in the screw cylinder 6. Therefore, it is possible to determine whether or not the screw is screwed to the proper screwing amount only by looking at whether or not the male screw portion 7aa on the end side is hidden in the screw cylinder. Therefore, it is possible to make a quick determination at the site. Since this index is a part from which the male screw 7a is removed, it is visually clear and can be easily processed.
Since it is a screw-type reinforcing bar joint, it has excellent connection workability, shortens the construction period compared to a grout-injection type special joint, etc., and provides the advantage that the bar arrangement is simplified compared to a lap joint. When the male screw part 7 is a rolled screw, a long threaded rod S7 having a male screw S7a formed over its entire length, which is the material, can be easily manufactured. Manufacturing becomes even easier.

また、この長さ調整用ねじ式鉄筋継手の製造方法は、雄ねじ部品7を製造する過程として、図2と共に前述したように、長尺のねじ棒S7を準備し、このねじ棒7Sから希望の長さの雄ねじ部品素材W7を切断して得て雄ねじ部品7に加工するため、任意の長さの長さ調整用ねじ式鉄筋継手4を容易に製造することができる。   In addition, in the manufacturing method of this length-adjustable threaded steel rebar joint, as described above with reference to FIG. 2, as a process of manufacturing the male screw part 7, a long screw rod S7 is prepared, and a desired screw rod 7S is used. Since the male thread component material W7 having a length is cut and processed into the male thread component 7, the length-adjustable threaded reinforcing bar joint 4 can be easily manufactured.

図6は、上記構成の長さ調整用ねじ式鉄筋継手4を適用した鉄筋コンクリート柱の配筋構造となる継手付き鉄筋構造を示す。柱10は、鉄筋コンクリート造の建物における鉄筋コンクリート柱であり、複数の階の床梁等となる梁11が接合される。柱10の配筋は、図7に水平断面を示すように、柱断面の外周部に沿って配列される複数本の主筋12と、上下に多数並んで設けられて主筋12を取り巻くフープ13とでなる。   FIG. 6 shows a jointed reinforcing bar structure which is a reinforcing bar structure of a reinforced concrete column to which the length-adjustable threaded reinforcing bar joint 4 of the above configuration is applied. The column 10 is a reinforced concrete column in a reinforced concrete building, and a beam 11 serving as a floor beam or the like of a plurality of floors is joined thereto. As shown in the horizontal cross section in FIG. 7, the bar 10 has a plurality of main bars 12 arranged along the outer periphery of the column cross section, and a hoop 13 provided in a large number in the vertical direction and surrounding the main bar 12. It becomes.

図6に示すように、各主筋12は、それぞれ複数本の鉄筋1,1Aを、ねじ式の鉄筋継手2〜4を介して順次接続され、1本の連続した鉄筋配列となる継手付き鉄筋構造とされている。この鉄筋配列の上下端の鉄筋1,1Aにおける鉄筋配列の端部には、ねじ式の拡径頭部5が設けられている。この主筋12となる鉄筋配列の鉄筋1,1Aのうち、最上部の鉄筋を含む上側の1本または複数本の鉄筋1Aは、下側の鉄筋1に比べて小径のものが使用されている。なお、小径の鉄筋1Aは、図1〜5では鉄筋1として説明しており、図6〜8では小径の鉄筋と大径の鉄筋とを区別するため、大径の鉄筋に符号「1」を付し、小径の鉄筋に符号「1A」を付している。これら大径の鉄筋1および小径の鉄筋1Aは、いずれも、図4と共に前述したように両端に雄ねじ部1aを有する両端雄ねじ付き鉄筋とされている。これら両端雄ねじ付きの鉄筋1,1Aは、各種の鉄筋径毎に、互いに種々長さの異なる複数種類の定尺物として準備され、その準備された中から、任意の長さの鉄筋1,1Aが選択して使用される。   As shown in FIG. 6, each main reinforcing bar 12 has a jointed reinforcing bar structure in which a plurality of reinforcing bars 1, 1 </ b> A are sequentially connected via screw-type reinforcing bar joints 2 to 4 to form a single continuous reinforcing bar array. It is said that. A screw-type enlarged diameter head 5 is provided at the end of the reinforcing bar arrangement of the reinforcing bars 1 and 1A at the upper and lower ends of the reinforcing bar arrangement. Of the reinforcing bars 1 and 1A in the reinforcing bar arrangement as the main reinforcing bars 12, one or more upper reinforcing bars 1A including the uppermost reinforcing bars have a smaller diameter than the lower reinforcing bar 1. The small-diameter rebar 1 </ b> A is described as the rebar 1 in FIGS. 1 to 5, and in FIGS. 6 to 8, the small-diameter rebar is distinguished from the large-diameter rebar in order to distinguish the large-diameter rebar “1”. The small-diameter reinforcing bar is denoted by “1A”. Both the large-diameter rebar 1 and the small-diameter rebar 1A are both-end male threaded rebars having the male screw portions 1a at both ends as described above with reference to FIG. These rebars 1 and 1A with male threads on both ends are prepared as a plurality of types of standard objects having different lengths for each rebar diameter, and from the prepared rebars 1 and 1A of any length. Is selected and used.

前記ねじ式の鉄筋継手2〜4として、同図(D)の一般部用ねじ式鉄筋継手2と、同図(B)の異径鉄筋ねじ式鉄筋継手3と、同図(C)の長さ調整用ねじ式鉄筋継手4とが用いられている。異径鉄筋ねじ式鉄筋継手3は、大径の鉄筋1と小径の鉄筋1Aとの接続箇所に用いられる。長さ調整用ねじ式鉄筋継手4は、図1〜5と共に前述したものである。長さ調整用ねじ式鉄筋継手4は、図示の例では1本に接続される鉄筋配列の中で1か所に用いられている。長さ調整用ねじ式鉄筋継手4は、大径の鉄筋1の鉄筋配列毎、および小径の鉄筋1Aの鉄筋配列毎に、それぞれ1か所設けても良く、さらに複数設けても良い。一般部用ねじ式鉄筋継手2は、1本に接続される鉄筋配列の任意の箇所に用いられる。   As the screw-type reinforcing bar joints 2 to 4, the general-purpose screw-type reinforcing bar joint 2 shown in FIG. 4D, the different diameter reinforcing bar screw-type reinforcing bar joint 3 shown in FIG. A screw-type reinforcing steel joint 4 for adjusting the thickness is used. The different-diameter reinforcing bar screw type reinforcing bar joint 3 is used at a connecting portion between a large-diameter reinforcing bar 1 and a small-diameter reinforcing bar 1A. The length-adjusting threaded reinforcing bar joint 4 is the same as that described above with reference to FIGS. In the illustrated example, the length-adjusting screw-type reinforcing bar joint 4 is used at one place in the reinforcing bar array connected to one. The length-adjusting screw-type reinforcing bar joint 4 may be provided for each reinforcing bar arrangement of the large-diameter reinforcing bar 1 and for each reinforcing bar arrangement of the small-diameter reinforcing bar 1A, or a plurality of them may be provided. The general-purpose threaded reinforcing bar joint 2 is used at an arbitrary position of the reinforcing bar array connected to one.

一般部用ねじ式鉄筋継手2は、大径の鉄筋1および小径の鉄筋1Aに応じた各径のものが用いられる。長さ調整用ねじ式鉄筋継手4についても、大径の鉄筋1の鉄筋配列および小径の鉄筋1Aの鉄筋配列にそれぞれ用いる場合は、大径の鉄筋1および小径の鉄筋1Aに応じた各径のものが用いられる。   As the general-purpose screw-type reinforcing bar joint 2, those having various diameters corresponding to the large-diameter reinforcing bar 1 and the small-diameter reinforcing bar 1 </ b> A are used. When the length-adjustable threaded reinforcing bar joint 4 is also used for the reinforcing bar arrangement of the large-diameter reinforcing bar 1 and the reinforcing bar arrangement of the small-diameter reinforcing bar 1A, each of the diameters corresponding to the large-diameter reinforcing bar 1 and small-diameter reinforcing bar 1A Things are used.

一般部用ねじ式鉄筋継手2は、互いに連結される一対の鉄筋1,1(1A,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1,1(1A,1A)の雄ねじ部1a,1aが螺合する雌ねじとされたねじ筒26を設けたものである。、両鉄筋1,1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26の雌ねじの螺旋方向は、ねじ筒26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。ねじ筒26は、長さ調整用ねじ式鉄筋継手4のねじ筒2と同様の構成とされる。   The general-part threaded reinforcing bar joint 2 is formed by forming a pair of reinforcing bars 1 and 1 (1A, 1A) connected to each other at a large-diameter male threaded portion 1a, and an inner peripheral surface of the pair of reinforcing bars. 1, 1 (1A, 1A) is provided with a screw cylinder 26 which is a female screw into which male screw parts 1a, 1a are screwed. The spiral directions of the male screw portions 1a and 1a of both the reinforcing bars 1 and 1 are the same. The spiral direction of the internal thread of the screw cylinder 26 is the same over the entire length of the screw cylinder 26. Both are forward screw directions. The screw cylinder 26 has the same configuration as that of the screw cylinder 2 of the length-adjusting threaded reinforcing bar joint 4.

異径鉄筋ねじ式鉄筋継手3は、1本の両端異径雄ねじ部品31と、大径側ねじ筒32と、小径側ねじ筒33とでなる。両端異径雄ねじ部品31は、大径の鉄筋1の雄ねじ部1aおよび小径の鉄筋1Aの雄ねじ部1aとそれぞれ径およびリードが同じとされた大径側雄ねじ部31bおよび小径側雄ねじ部31cを、丸軸部材31aの両端に各々形成したものである。大径側ねじ筒32と、これに接続される両端異径雄ねじ部品31の大径側雄ねじ部31b、および大径の鉄筋1の雄ねじ部1aにより、大径側継手部3aが構成され、前記小径側ねじ筒33と、これに接続される両端異径雄ねじ部品31の小径側雄ねじ部31c、および小径の鉄筋1Aの雄ねじ部1aにより、小径側継手部3bが構成される。   The different diameter reinforcing bar screw type reinforcing bar joint 3 is composed of one end both end different diameter male screw part 31, a large diameter side screw cylinder 32, and a small diameter side screw cylinder 33. The male screw part 31 with different diameters at both ends includes a large-diameter side male screw part 31b and a small-diameter side male screw part 31c having the same diameter and lead as the male screw part 1a of the large-diameter rebar 1 and the male screw part 1a of the small-diameter rebar 1A. It is formed at both ends of the round shaft member 31a. The large-diameter side threaded cylinder 32, the large-diameter-side male thread part 31b of the both-ends different-diameter male thread part 31 connected thereto, and the male thread part 1a of the large-diameter rebar 1 constitute a large-diameter side joint part 3a. A small-diameter side joint portion 3b is configured by the small-diameter side screw tube 33, the small-diameter-side male screw portion 31c of the both-ends different-diameter male screw component 31 connected thereto, and the male screw portion 1a of the small-diameter rebar 1A.

大径側ねじ筒32は、内面に雌ねじ32aを有し前記両端異径雄ねじ部品31の大径側雄ねじ部31bと大径の鉄筋1の雄ねじ1aとに渡って螺合する部品である。小径側ねじ筒33は、内面に雌ねじ3aを有し両端異径雄ねじ部品31の小径側雄ねじ部31cと小径の鉄筋1の雄ねじ部1aとに渡って螺合する。   The large-diameter side screw cylinder 32 has a female screw 32a on its inner surface, and is a part that is screwed over the large-diameter side male screw part 31b of the both-ends different-diameter male screw part 31 and the male screw 1a of the large-diameter rebar 1. The small-diameter side screw cylinder 33 has a female screw 3 a on the inner surface and is screwed over the small-diameter side male screw part 31 c of the male screw part 31 having different diameters on both ends and the male screw part 1 a of the small-diameter rebar 1.

なお、異径鉄筋ねじ式鉄筋継手3は、鉄筋1の径毎に、または鉄筋1Aの径毎に準備しておくことが好ましい。また、大径の鉄筋1と小径の鉄筋1Aの径の、互いに接続可能な組み合わせ毎に準備しておいても良い。   In addition, it is preferable to prepare the different-diameter reinforcing bar screw-type reinforcing bar joint 3 for each diameter of the reinforcing bar 1 or for each diameter of the reinforcing bar 1A. Moreover, you may prepare for every combination which can connect mutually with the diameter of the large diameter reinforcing bar 1 and the small diameter reinforcing bar 1A.

ねじ式の拡径頭部5は、鉄筋1,1Aの端部の雄ねじ部1aに、同図の拡径頭部形成部品51を螺合して構成される。拡径頭部形成部品51は、鋼板または鋼製のブロック材に穴を設けて雌ねじ51aを形成した部品である。拡径頭部形成部品51の正面形状は、円形としても、また矩形としても良い。   The screw-type enlarged head portion 5 is configured by screwing the enlarged head forming component 51 shown in FIG. The diameter-enlarged head forming component 51 is a component in which a female screw 51a is formed by providing a hole in a steel plate or a steel block material. The front shape of the enlarged diameter head forming component 51 may be circular or rectangular.

この継手付き鉄筋構造は、各鉄筋1,1Aの全てをねじ式鉄筋継手2〜4で接続するため、重ね継手に比べて配筋が簡素にでき、またグラウト注入式の機械継手等と比べて接続作業性に優れ、施工期間短縮の短縮が図れる。
特に、長さ調整用ねじ式鉄筋継手4を用いるため、長さ調整用ねじ式鉄筋継手4につき、種々異なる長さのものを準備しておき、選択して使用することで、前記雄ねじ付きの鉄筋1,1Aの長さが一定であっても、希望の総長の鉄筋配列体となる主筋12が得られる。そのため、両端雄ねじ部付きの鉄筋1,1Aを、図4と共に前述したように定尺物として多数準備しておき、必要時に使用することができる。例えば鉄筋の製造業者が、両端雄ねじ部付きの鉄筋1,1Aを定尺の規格品として数種類準備しておき、建物の施工業者がその鉄筋を購入して特に加工することなくそのまま使用することができる。このため、要求長さの鉄筋毎に両端に雄ねじ部を加工する受注生産の場合に比べて、両端雄ねじ部付きの鉄筋1,1Aを効率良く生産することができて、コスト低減が図れる。また、両端雄ねじ部付きの鉄筋1,1Aの標準化による品質向上が図れる。長さ調整用ねじ式鉄筋継手4は、長さの異なる多種類のものを準備する必要があるが、鉄筋1,1Aに比べて小さい部品であり、また雄ねじ部品7のみを種々異ならせて準備しておけば良く、ねじ筒6は共通品で良いため、種類増による生産性低下の影響が少ない。しかも、雄ねじ部品7は、前述のように種々の長さのものが容易に製造できる。
In this rebar structure with joints, all of the rebars 1 and 1A are connected by threaded rebar joints 2 to 4, so the rebar arrangement can be simplified compared to lap joints, and compared to grout-injection type mechanical joints, etc. It is excellent in connection workability and can shorten the construction period.
In particular, since the length-adjustable threaded steel rebar joint 4 is used, the length-adjustable threaded steel rebar joint 4 is prepared with various lengths, and can be selected and used. Even if the lengths of the reinforcing bars 1 and 1A are constant, the main reinforcing bars 12 serving as a reinforcing bar array of the desired total length can be obtained. Therefore, a large number of rebars 1 and 1A with both ends male threaded portions can be prepared as standard objects as described above with reference to FIG. 4 and used when necessary. For example, a rebar manufacturer may prepare several types of rebars 1 and 1A with male threaded ends on both ends as regular standard products, and a building contractor purchases the rebar and uses it without any special processing. it can. For this reason, it is possible to efficiently produce the reinforcing bars 1 and 1A with the male threaded portions at both ends, as compared with the case of order production in which the male threaded portions are processed at both ends for each of the required lengths of the reinforcing bars, and the cost can be reduced. In addition, the quality can be improved by standardizing the reinforcing bars 1 and 1A with both ends male threaded portions. It is necessary to prepare various types of length-adjustable threaded steel rebar joints 4 having different lengths, but they are smaller parts than rebars 1 and 1A, and are prepared by making only male thread part 7 different. Since the screw cylinder 6 may be a common product, there is little influence of a decrease in productivity due to an increase in types. Moreover, the male screw component 7 can be easily manufactured in various lengths as described above.

また、柱10の主筋12として、互いに径の異なる鉄筋1,1Aを用いるため、作用する荷重に応じて必要な径の鉄筋を使用することができて、鋼材使用料が削減できる。径の異なる鉄筋1,1Aを用いるが、前記実施形態の異径鉄筋ねじ式鉄筋継手3を用いるため、ねじ式鉄筋継手を用いながら、接続が可能であり、かつねじ式鉄筋継手による、接続作業性、施工期間短縮の利点が得られる。   Further, since the reinforcing bars 1 and 1A having different diameters are used as the main reinforcing bars 12 of the column 10, reinforcing bars having a necessary diameter can be used according to the acting load, and the steel material usage fee can be reduced. Reinforcing bars 1 and 1A having different diameters are used, but since the different-diameter reinforcing bar screw-type reinforcing bar joint 3 of the above embodiment is used, connection is possible while using a screw-type reinforcing bar joint, and connection work using a screw-type reinforcing bar joint Advantages of shortening the construction period.

さらに、前記のように、鉄筋1,1Aに拡径頭部形成部品51を螺合して定着力付与用の拡径頭部5を形成する場合は、ねじ式鉄筋継手2〜4で接続されることによる配筋の簡素化、施工期間短縮に加えて、拡径頭部付きの鉄筋とできて、より一層の配筋の簡素化、使用鉄筋量の節減、過密配筋の軽減の利点が得られる。配筋簡素化は、拡径頭部5付きの鉄筋とねじ式鉄筋継手2〜4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5は、鉄筋1,1Aの端部の雄ねじ部1aに拡径頭部形成部品51を螺合して形成するため、両端雄ねじ部付きの鉄筋1,1Aの雄ねじ部1aを、ねじ式鉄筋継手2〜4と拡径頭部5とのいずれにも使用できて、鉄筋配列の端部の鉄筋1,1Aを含めて、全ての鉄筋1,1Aに両端雄ねじ部付きの鉄筋1,1Aを用いることができ、生産性の向上が図れる。これにより、両端雄ねじ部付きの鉄筋1,1Aの標準化、定尺化による生産性向上の各効果が、より効果的に得られる。拡径頭部5は、鉄筋に一体に形成する場合は、拡径頭部の形成のための専用の誘導加熱,加圧成形の設備が必要となるが、鉄筋継手2〜4と兼用の雄ねじ部1aを利用することで、このような設備も不要となる。   Further, as described above, when the enlarged diameter head forming component 51 is screwed into the reinforcing bars 1 and 1A to form the enlarged diameter head 5 for giving fixing force, the connection is made by the screw type reinforcing bar joints 2 to 4. In addition to the simplification of reinforcement and shortening the construction period, it can be made with a rebar with an enlarged head, which has the advantages of further simplification of reinforcement, reduction of the amount of reinforcing bars used, and reduction of overcrowded reinforcement. can get. Simplification of the bar arrangement is obtained with both the reinforcing bar with the enlarged diameter head 5 and the threaded reinforcing bar joints 2 to 4, and a higher effect can be obtained by the combined use. Moreover, since the enlarged diameter head 5 is formed by screwing the enlarged diameter head forming component 51 into the male threaded portion 1a at the end of the reinforcing bars 1 and 1A, the male threaded portion 1a of the reinforcing bars 1a and 1A with the both ends male threaded portions. Can be used for any of the threaded reinforcing bar joints 2 to 4 and the enlarged diameter head 5, and all the reinforcing bars 1, 1A including the reinforcing bars 1, 1A at the end of the reinforcing bar arrangement are provided with male screw parts at both ends. Reinforcing bars 1 and 1A can be used, and productivity can be improved. Thereby, each effect of productivity improvement by the standardization of the reinforcing bars 1 and 1A with both ends male screw parts and the sizing can be obtained more effectively. When the enlarged diameter head 5 is formed integrally with the reinforcing bar, a dedicated induction heating and pressure forming facility for forming the enlarged diameter head is required. By using the part 1a, such facilities are also unnecessary.

この継手付き鉄筋構造を、この実施形態のように、柱10の主筋12に適用した場合は、その大径の鉄筋1と小径の鉄筋1Aとを接続できる利点が、より効果的に発揮させる。すなわち、鉄筋コンクリート柱10では、前記のように上階の主筋となる鉄筋1Aは、作用する荷重が小さいために小径の鉄筋が使用されることが多い。そのため、上記構成の異径鉄筋ねじ式鉄筋継手3によって、異径の鉄筋1,1Aを用いながら、ねじ式鉄筋継手により作業性良く接続できて施工期間が短縮できるという利点がより一層効果的となる。   When this jointed reinforcing bar structure is applied to the main bar 12 of the column 10 as in this embodiment, the advantage that the large diameter reinforcing bar 1 and the small diameter reinforcing bar 1A can be connected is more effectively exhibited. That is, in the reinforced concrete column 10, the reinforcing bar 1 </ b> A serving as the main reinforcing bar on the upper floor is often a small-diameter reinforcing bar because the acting load is small. Therefore, by using the different diameter reinforcing bar screw type reinforcing bar joint 3 having the above configuration, the advantage that the work period can be shortened by using the screw type reinforcing bar joint and the construction period can be shortened while using the different diameter reinforcing bars 1 and 1A is more effective. Become.

図8は、この継手付き鉄筋構造を、梁14の主筋15に適用した例を示す。この梁14を設けた建物16は、1階部分のみが広い建物であって、上階部分がある建物部分16aと、上階部分のない建物部分16bとがある。この上階部分のない建物部分16bの屋根を構成する梁14は、上階部分がある建物部分16aに渡って形成されているが、梁主筋15には、上階部分がある建物部分16aでは太い鉄筋1が、上階部分のない建物部分16bでは細い鉄筋1Aが使用されていて、前記実施形態と同様に、各ねじ式の鉄筋継手2〜4により接続されている。すなわち、大径の鉄筋1と小径の鉄筋1Aとの接続に異径鉄筋ねじ式鉄筋継手3,3Aが用いられ、他の部分に一般部用ねじ式鉄筋継手2および長さ調整用ねじ式鉄筋継手4,4Aが用いられている。また、この鉄筋配列の左右両端の鉄筋1,1Aにおける鉄筋配列の端部には、ねじ式の拡径頭部5が設けられている。   FIG. 8 shows an example in which the jointed reinforcing bar structure is applied to the main bar 15 of the beam 14. The building 16 provided with the beam 14 is a building having a wide first floor portion, and includes a building portion 16a having an upper floor portion and a building portion 16b having no upper floor portion. The beam 14 constituting the roof of the building portion 16b without the upper floor portion is formed over the building portion 16a with the upper floor portion. The thick reinforcing bar 1 is used in the building part 16b without the upper floor part, and the thin reinforcing bar 1A is used, and is connected by the screw-type reinforcing bar joints 2 to 4 as in the above embodiment. That is, different-diameter rebar screw-type rebar joints 3 and 3A are used for connection between the large-diameter rebar 1 and the small-diameter rebar 1A. Joints 4 and 4A are used. Moreover, the screw-type diameter-expanded head 5 is provided in the edge part of the reinforcing bar arrangement | sequence in the reinforcing bars 1 and 1A of the both ends of this reinforcing bar arrangement | sequence.

なお、図6,図8の各例は、いずれも径の異なる鉄筋1,1Aを用いているが、鉄筋接続体の全体に渡って同じ径の鉄筋1を用いる場合にも、この発明を効果的に適用することができる。また、上記各ねじ筒6、26、32、33の外周面には、エポキシ系塗料等による防錆被覆を設けても良い。   6 and 8 use the reinforcing bars 1 and 1A having different diameters. However, the present invention is effective even when the reinforcing bars 1 having the same diameter are used throughout the connecting bars. Can be applied. Moreover, you may provide the antirust coating | cover with an epoxy-type paint etc. in the outer peripheral surface of each said screw cylinder 6,26,32,33.

1,1A…鉄筋
1a…雄ねじ部
2…一般部用ねじ式鉄筋継手
3…異径鉄筋ねじ式鉄筋継手
4…長さ調整用ねじ式鉄筋継手
5…拡径頭部
6a…雌ねじ
6…ねじ筒
7…雄ねじ部品
7a…雄ねじ
7aa…雄ねじ部分
7b…雄ねじ除去部
10…柱
11…梁
12…主筋
S7…ねじ棒
S7a…雄ねじ
W7…雄ねじ部品素材
DESCRIPTION OF SYMBOLS 1, 1A ... Reinforcing bar 1a ... Male thread part 2 ... General-purpose screw type reinforcing bar joint 3 ... Different diameter reinforcing bar screw type reinforcing bar joint 4 ... Length adjusting screw type reinforcing bar joint 5 ... Expanded head 6a ... Female screw 6 ... Screw cylinder 7 ... male screw part 7a ... male screw 7aa ... male screw part 7b ... male screw removing part 10 ... column 11 ... beam 12 ... main bar S7 ... screw rod S7a ... male screw W7 ... male screw part material

Claims (4)

一対の鉄筋の端部間に介在して両鉄筋を相互に接続する鉄筋継手であって、
1本の雄ねじ部品と、2個のねじ筒とを備え、これらねじ筒は、内周に全長に渡る雌ねじを有し、前記各鉄筋の端部に形成された雄ねじ部とこれら雄ねじ部に対向する前記雄ねじ部品の各端部とに渡って螺合するものであり、前記雄ねじ部品は、全長に渡って外周に雄ねじが形成され、前記ねじ筒に螺合する雄ねじ部分に隣接する箇所に、前記雄ねじが除去された雄ねじ除去部を有し、この雄ねじ除去部は、この雄ねじ除去部よりも端側の雄ねじ部分の全体が前記ねじ筒内に隠れるまでねじ込まれることで適正ねじ込み量であることを示す指標となる長さ調整用ねじ式鉄筋継手。
Reinforcing bar joint that intervenes between the ends of a pair of reinforcing bars and connects both reinforcing bars to each other,
One male screw part and two screw cylinders are provided. These screw cylinders have internal threads extending over the entire length on the inner periphery, and are opposed to the male screw parts formed at the ends of the respective reinforcing bars and the male screw parts. The male screw part is screwed over each end of the male screw part, and the male screw part is formed with a male screw on the outer periphery over its entire length, and at a location adjacent to the male screw part screwed into the screw cylinder, It has a male screw removing portion from which the male screw has been removed, and this male screw removing portion has an appropriate screwing amount by being screwed in until the entire male screw portion on the end side of the male screw removing portion is hidden in the screw cylinder. A threaded rebar joint for length adjustment that serves as an indicator of
請求項1において、前記雄ねじ部品の前記雄ねじが転造ねじである長さ調整用ねじ式鉄筋継手。   2. The length-adjustable threaded reinforcing bar joint according to claim 1, wherein the male screw of the male screw component is a rolled screw. 請求項1または請求項2に記載の長さ調整用ねじ式鉄筋継手を製造する方法であって、前記雄ねじ部品を製造する過程として、全長に渡って雄ねじが形成されたねじ棒を準備する過程と、このねじ棒から希望の長さの雄ねじ部品素材を切断して得る過程と、この雄ねじ部品素材に前記雄ねじ除去部を加工して前記雄ねじ部品とする過程とを含む長さ調整用ねじ式鉄筋継手の製造方法。   3. A method of manufacturing a length-adjustable threaded reinforcing bar joint according to claim 1 or 2, wherein, as a process of manufacturing the male threaded part, a process of preparing a threaded rod having a male thread formed over its entire length. And a process for obtaining a male screw part material having a desired length from the threaded rod, and a process for processing the male screw removing part into the male screw part material to form the male screw part. A method for manufacturing a reinforcing bar joint. 複数本の鉄筋を、鉄筋継手を介して順次接続した継手付き鉄筋構造であって、前記鉄筋継手が複数箇所に設けられ、これら複数の鉄筋継手を、それぞれ各鉄筋の端部に設けられた雄ねじ部およびこの雄ねじ部に螺合する雌ねじが形成されたねじ筒を有する継手であるねじ式鉄筋継手とし、これら複数のねじ式鉄筋継手のうちの少なくとも一つを、請求項1または請求項2に記載の長さ調整用ねじ式鉄筋継手とし、前記各鉄筋を両端に雄ねじ部を有するものとした継手付き鉄筋構造。   A rebar structure with a joint in which a plurality of rebars are sequentially connected via a rebar joint, wherein the rebar joint is provided at a plurality of locations, and the plurality of rebar joints are respectively provided at the end of each rebar. And a threaded rebar joint that is a joint having a threaded cylinder in which a female thread that is threadedly engaged with the male thread portion is formed. At least one of the plurality of threaded rebar joints is defined in claim 1 or claim 2. A rebar structure with a joint, wherein the length-adjustable threaded steel bar joint has the male thread at both ends.
JP2010038510A 2010-02-24 2010-02-24 Length regulating screw type reinforcement joint, manufacturing method therefor, and reinforcement structure with joint Pending JP2011174277A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013185425A (en) * 2012-03-12 2013-09-19 Tokai Corp Bar arrangement structure and bar arrangement construction method of steel structure building/concrete foundation beam
JP2013204343A (en) * 2012-03-29 2013-10-07 Tokyo Tekko Co Ltd Reinforcement cage erection method and temporary fixing device

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JPS58108024U (en) * 1982-01-18 1983-07-22 株式会社長谷川工務店 reinforcing bar joint fittings
JPH0978766A (en) * 1995-09-08 1997-03-25 Sumitomo Metal Ind Ltd Screw joint for bar steel
JP2001254481A (en) * 2000-03-09 2001-09-21 Kobefooji:Kk Joint structure of reinforcing bar

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58108024U (en) * 1982-01-18 1983-07-22 株式会社長谷川工務店 reinforcing bar joint fittings
JPH0978766A (en) * 1995-09-08 1997-03-25 Sumitomo Metal Ind Ltd Screw joint for bar steel
JP2001254481A (en) * 2000-03-09 2001-09-21 Kobefooji:Kk Joint structure of reinforcing bar

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013185425A (en) * 2012-03-12 2013-09-19 Tokai Corp Bar arrangement structure and bar arrangement construction method of steel structure building/concrete foundation beam
JP2013204343A (en) * 2012-03-29 2013-10-07 Tokyo Tekko Co Ltd Reinforcement cage erection method and temporary fixing device
KR20130111457A (en) * 2012-03-29 2013-10-10 도쿄 데코 가부시키가이샤 Method of erecting reinforcement cage and temporary fixing device
KR102079398B1 (en) * 2012-03-29 2020-02-19 도쿄 데코 가부시키가이샤 Method of erecting reinforcement cage and temporary fixing device

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