JP2020007725A - Reinforcement fixing material and connecting method for reinforcement using reinforcement fixing material - Google Patents
Reinforcement fixing material and connecting method for reinforcement using reinforcement fixing material Download PDFInfo
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- JP2020007725A JP2020007725A JP2018126926A JP2018126926A JP2020007725A JP 2020007725 A JP2020007725 A JP 2020007725A JP 2018126926 A JP2018126926 A JP 2018126926A JP 2018126926 A JP2018126926 A JP 2018126926A JP 2020007725 A JP2020007725 A JP 2020007725A
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- reinforcing bar
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Abstract
Description
本発明は、鉄筋コンクリート構造（ＲＣ構造）の建築物における鉄筋どうしの接続部に用いられる充填材含浸テープジョイント、および、充填材含浸テープジョイントを用いた鉄筋どうしの接続方法に関する。 The present invention relates to a filler-impregnated tape joint used for a joint between reinforcing bars in a reinforced concrete structure (RC structure), and a method for connecting reinforcing bars using a filler-impregnated tape joint.
ＲＣ構造の建築物においては、柱や梁に埋設する鉄筋を接続する際に、接続する二本の鉄筋の端部を筒形状の受け部材の内部に挿入し、鉄筋と受け部材との隙間にモルタルを充填して鉄筋どうしを固着させる技術がある。従来からそのような鉄筋の接続作業を効率化する技術が提案されており、例えば、特許文献１に示された技術もその一つである。 In buildings with RC structures, when connecting reinforcing bars buried in pillars and beams, insert the ends of the two reinforcing bars to be connected into the inside of the cylindrical receiving member, and insert them into the gap between the reinforcing bar and the receiving member. There is a technique of filling mortar and fixing rebars. Conventionally, a technique for improving the efficiency of such a rebar connection work has been proposed, and for example, a technique disclosed in Patent Document 1 is one of them.
特許文献１に記載された技術は、受け部材に挿入する鉄筋を容易に仮固定するために、鉄筋に係合する金具を受け部材の内部に予め設けておくものである。この金具は、バネ弾性の強い鋼材などで形成され、鉄筋を周方向に取り囲む帯状の基片と、この基片から鉄筋の長手方向に沿って突出する短舌片と長舌片とを備えている。 The technique described in Patent Literature 1 is provided in advance in a receiving member to easily and temporarily fix a reinforcing bar to be inserted into the receiving member. This metal fitting is formed of a steel material or the like having high spring elasticity, and includes a band-shaped base piece surrounding the rebar in the circumferential direction, and a short tongue piece and a long tongue piece protruding from the base piece in the longitudinal direction of the rebar. .
このうち短舌片は、受け部材の内面に係合して、当該金具を受け部材に固定するものである。一方の長舌片は、挿入される鉄筋の外表面に周方向に沿った複数の個所で係合し、鉄筋の抜け出しを防止する。つまり、受け部材の内部に予め設置した略環状の金具に鉄筋を挿入することで、長舌片が鉄筋の外面に噛み込み、戻り防止の機能を発揮して、鉄筋の位置を固定する。鉄筋が受け部材に固定されたのち、受け部材の側面に設けた孔部からモルタルが充填され、鉄筋の本固定が行われる。 The short tongue engages with the inner surface of the receiving member to fix the metal fitting to the receiving member. The one long tongue piece engages with the outer surface of the inserted reinforcing bar at a plurality of locations along the circumferential direction to prevent the reinforcing bar from coming off. That is, by inserting the reinforcing bar into a substantially annular metal fitting previously set in the receiving member, the long tongue bites into the outer surface of the reinforcing bar, exerts a function of preventing return, and fixes the position of the reinforcing bar. After the reinforcing bar is fixed to the receiving member, the mortar is filled from a hole provided on the side surface of the receiving member, and the reinforcing bar is permanently fixed.
このような金具を用いることで、鉄筋を受け部材の定位置に素早く配置することができ、鉄筋接続作業の効率が向上するとのことである。 By using such metal fittings, the rebar can be quickly arranged at a fixed position of the receiving member, and the efficiency of the rebar connection work is improved.
しかし、上記従来の方法では、受け部材の側面に設けた孔部から受け部材の内部にモルタルを充填する必要があるなど、鉄筋の接続作業は未だ煩雑なままである。また、受け部材の内部に形状保持性の高い金具が存在することで、モルタルが鉄筋あるいは受け部材の内面と接触せず、モルタルの接着効果が損なわれる可能性もある。 However, in the above-mentioned conventional method, the connection work of the reinforcing steel bars is still complicated, for example, it is necessary to fill the inside of the receiving member with mortar from the hole provided on the side surface of the receiving member. In addition, since the metal having high shape retention exists inside the receiving member, the mortar does not come into contact with the reinforcing steel or the inner surface of the receiving member, and the adhesive effect of the mortar may be impaired.
このような実情に鑑み、従来から、より作業効率の高い鉄筋と受け部材との充填材を用いた接続技術が求められている。 In view of such circumstances, there has been a demand for a connection technique using a filler between a reinforcing bar and a receiving member that has higher working efficiency.
（特徴構成）
本発明に係る鉄筋固定材は、充填材を第１保護層および第２保護層で被覆しつつシート状に形成した点に特徴を有する。
(Feature configuration)
The reinforcing bar fixing material according to the present invention is characterized in that the filler is formed into a sheet while being covered with the first protective layer and the second protective layer.
（効果）
本構成の鉄筋固定材は、例えば、鉄筋コンクリート構造物の柱や梁に配設する鉄筋を樹脂モルタルなどの充填材を用いて接続する箇所に用いることができる。鉄筋の接続に際しては、例えば、互いに接続する二本の鉄筋を一つの受け部材の内部に挿入し、鉄筋と受け部材との隙間に充填材を満たす必要がある。そのために、本構成の鉄筋固定材を鉄筋の端部に巻き付けるなど仮固定し、これらを受け部材の内部に挿入することで、充填材の充填作業が容易になる。
(effect)
The reinforcing bar fixing material of this configuration can be used, for example, at a location where reinforcing bars provided on columns or beams of a reinforced concrete structure are connected using a filler such as resin mortar. When connecting the reinforcing bars, for example, it is necessary to insert two reinforcing bars that are connected to each other into one receiving member and fill a gap between the reinforcing bar and the receiving member with a filler. For this reason, by temporarily fixing the rebar fixing material of this configuration by winding it around the end of the rebar and inserting these into the receiving member, the filling operation of the filler becomes easy.
また、充填材はシート状に伸ばされ、第１保護層と第２保護層とで被覆されているため、例えば、鉄筋が受け部材の内部に挿入されて第１保護層あるいは第２保護層が破損するまでは外部の空気との接触が遮断される。よって、鉄筋の接続作業に至るまでのあいだ鉄筋固定材の保存が可能となり、鉄筋接続の作業性を向上させることができる。 Further, since the filler is stretched in a sheet shape and covered with the first protective layer and the second protective layer, for example, a reinforcing bar is inserted inside the receiving member and the first protective layer or the second protective layer is formed. Until it breaks, contact with the outside air is cut off. Therefore, the reinforcing-bar fixing material can be preserved until the connecting operation of the reinforcing bars, and the workability of connecting the reinforcing bars can be improved.
（特徴構成）
本発明に係る鉄筋固定材にあっては、前記充填材を、互いに仕切層で分離された主剤および硬化剤とすることができる。
(Feature configuration)
In the reinforcing-bar fixing material according to the present invention, the filler may be a main agent and a curing agent separated from each other by a partition layer.
（効果）
本構成では、充填材を主剤と硬化剤との二成分を備えて構成し、主剤と硬化剤とを仕切層で分離してある。さらに、主剤および硬化剤は、夫々、第１保護層と第２保護層とによって外部から遮断されている。鉄筋は所定の重量を有するから、鉄筋を受け部材に挿入する際には鉄筋と受け部材とが強く当接する。これによって鉄筋固定材が破け、主剤と硬化剤とが効率よく混合される。
(effect)
In this configuration, the filler is configured to include two components of the main agent and the curing agent, and the main agent and the curing agent are separated by a partition layer. Further, the main agent and the curing agent are shielded from the outside by the first protective layer and the second protective layer, respectively. Since the reinforcing bar has a predetermined weight, when the reinforcing bar is inserted into the receiving member, the reinforcing bar and the receiving member come into strong contact with each other. Thereby, the reinforcing-bar fixing material is broken, and the main agent and the curing agent are efficiently mixed.
このように、本構成の鉄筋固定材は、互いに接続する例えば鉄筋と受け部材との間に二液性の充填材を簡単に配置し、効率的に混合することができる。例えば鉄筋の接続箇所など、鉄筋の配置方向が様々で、また、高所での接続が必要になるなど作業者の手が届き難い場所での接続作業が極めて容易となる。 As described above, in the reinforcing-bar fixing material of this configuration, the two-component filler can be easily arranged between, for example, the reinforcing bar and the receiving member that are connected to each other, and can be efficiently mixed. For example, connection directions in various places, such as a connection point of a reinforcing bar, and where a worker cannot easily reach, such as a need to connect at a high place, are extremely easy.
さらに、充填材を二成分で構成すると、充填材の硬化開始時期をより正確に設定できるうえ、鉄筋固定材の長期保存も可能となり、鉄筋接続作業の効率をさらに高めることができる。 Further, when the filler is composed of two components, the time to start curing of the filler can be set more accurately, and the long-term storage of the reinforcing-bar fixing material can be performed, so that the efficiency of the reinforcing-bar connection work can be further improved.
（特徴構成）
本発明に係る鉄筋固定材にあっては、前記第１保護層あるいは前記第２保護層の外面に粘着層を備え、当該粘着層のさらに外面に前記粘着層の利用に際して取り外す第３保護層を備えておくと好都合である。
(Feature configuration)
In the reinforcing bar fixing material according to the present invention, an adhesive layer is provided on the outer surface of the first protective layer or the second protective layer, and a third protective layer to be removed on the outer surface of the adhesive layer when the adhesive layer is used. It is convenient to prepare.
（効果）
本構成のように粘着層を備えることで、充填材の充填作業を行う対象物に鉄筋固定材を予め貼り付けておくことができる。よって、鉄筋など接続作業を行う対象物の姿勢が任意となり、充填材の配設作業がさらに容易なものとなる。
(effect)
By providing the adhesive layer as in this configuration, the reinforcing bar fixing material can be attached in advance to the object to be filled with the filler. Therefore, the posture of the object to be connected, such as a reinforcing bar, becomes arbitrary, and the work of arranging the filler is further facilitated.
（特徴構成）
本発明に係る鉄筋固定材にあっては、前記充填材が、硬化に際して膨張する特性を備えていると好都合である。
(Feature configuration)
In the rebar fixing material according to the present invention, it is advantageous that the filler has a property of expanding upon curing.
（効果）
本構成のように充填材が硬化時に膨張するものであれば、接続する部材どうしの隙間が狭い場合や、ネジ溝どうしの隙間である場合など、鉄筋固定材の状態で隙間を十分に埋めることができなくても、充填材の硬化に伴って隙間が解消される。よって、接続部の強度が十分に高いものとなる。
(effect)
If the filler expands when cured as in this configuration, fill the gap sufficiently in the state of the reinforcing bar fixing material, such as when the gap between the connecting members is narrow or when the gap is between screw grooves Even if it is not possible, the gap is eliminated with the curing of the filler. Therefore, the strength of the connection portion is sufficiently high.
（特徴構成）
本発明に係る鉄筋固定材にあっては、前記第１保護層および前記第２保護層の夫々の平面に沿う方向において引張強度が最小となる方向として、前記第１保護層が第１方向を有し、前記第２保護層が第２方向を有し、前記平面に垂直な方向視において、前記第１方向と前記第２方向とのなす角度が予め設定した角度以内であると好適である。
(Feature configuration)
In the reinforcing-bar fixing material according to the present invention, the first protective layer has the first direction as a direction in which the tensile strength is minimized in a direction along a plane of each of the first protective layer and the second protective layer. Preferably, the second protective layer has a second direction, and when viewed in a direction perpendicular to the plane, the angle between the first direction and the second direction is preferably within a preset angle. .
（効果）
本構成では、第１保護層および第２保護層の夫々につき、引張強度が最小となる方向を近い方向に揃えてある。これにより、例えば、鉄筋および受け部材のうち鉄筋固定材を取り付けた一方の部材を他方の部材に当接する場合に、最小の引張強度となる方向を部材どうしの当接方向に近付けておくことで二つの層が同時に破れ易くなる。このため主剤と硬化剤とを確実に混合することができる。
(effect)
In this configuration, for each of the first protective layer and the second protective layer, the direction in which the tensile strength is minimized is aligned in a near direction. Accordingly, for example, when one of the reinforcing bars and the receiving member to which the reinforcing bar fixing member is attached is brought into contact with the other member, the direction in which the minimum tensile strength is obtained is brought closer to the contact direction between the members. The two layers are easily torn at the same time. Therefore, the main agent and the curing agent can be surely mixed.
（特徴手段）
本発明に係る鉄筋の接続方法にあっては、表面に凹凸形状を有する鉄筋の端部を、孔部を有する受け部材に挿入して前記鉄筋と前記受け部材とを接続する際に、充填材を保護層で被覆しつつシート状に形成した鉄筋固定材を、前記鉄筋の外面あるいは前記受け部材の内面のうち少なくとも何れか一方に取り付け、前記鉄筋を前記受け部材に挿入させつつ前記保護層を破断させて前記充填材を硬化させる点に特徴を有する。
(Characteristic means)
In the method of connecting a reinforcing bar according to the present invention, when the end of the reinforcing bar having an uneven shape on the surface is inserted into a receiving member having a hole to connect the reinforcing bar and the receiving member, a filler is used. Is attached to at least one of the outer surface of the rebar or the inner surface of the receiving member, and the protective layer is inserted into the receiving member while the reinforcing layer is inserted into the receiving member. It is characterized in that the filler is hardened by breaking.
（効果）
本方法であれば、鉄筋あるいは受け部材に鉄筋固定材を巻き付けるなど仮固定した状態で両者を接続するから、鉄筋と受け部材との隙間に対する充填材の充填作業が極めて容易となる。また、充填材は保護層で被覆されているため、例えば、鉄筋が受け部材の内部に挿入されて保護層が破損するまでは外部の空気との接触が遮断される。よって、鉄筋の接続作業に至るまでのあいだ鉄筋固定材の保存が可能となり、鉄筋接続の作業性を向上させることができる。
(effect)
According to this method, since the two are connected in a state where they are temporarily fixed, for example, by winding a reinforcing bar fixing material around the reinforcing bar or the receiving member, the work of filling the gap between the reinforcing bar and the receiving member with the filler is extremely easy. Further, since the filler is covered with the protective layer, for example, the contact with the outside air is blocked until the reinforcing layer is inserted into the receiving member and the protective layer is damaged. Therefore, it is possible to save the reinforcing bar fixing material until the connecting operation of the reinforcing bars, and it is possible to improve workability of connecting the reinforcing bars.
（特徴手段）
本発明に係る鉄筋の接続方法にあっては、前記充填材が、主剤および硬化剤を有すると共に、前記主剤および前記硬化剤が仕切層によって分離されつつ層状に重ねられ、前記主剤が第１保護層で被覆され、前記硬化剤が第２保護層で被覆されたものであり、前記鉄筋を前記孔部に挿入することで、前記第１保護層および前記第２保護層および前記仕切層を破断させて前記主剤と前記硬化剤とを混合して硬化させることも可能である。
(Characteristic means)
In the method of connecting a reinforcing bar according to the present invention, the filler has a main agent and a curing agent, and the main agent and the curing agent are layered while being separated by a partition layer. The first protective layer, the second protective layer, and the partition layer are broken by inserting the reinforcing bar into the hole. Then, the main agent and the curing agent can be mixed and cured.
（効果）
本方法であれば、鉄筋の接続作業を行うまでは、主剤と硬化剤とを分離した状態に維持できるため鉄筋固定材の長期保存が可能となり、鉄筋固定材の取扱性が向上する。また、主剤と硬化剤とを分離状態に保護する第１保護層などは鉄筋と受け部材との当接によって破断するから、主剤と硬化剤との混合作業も容易である。
(effect)
According to this method, the main agent and the hardening agent can be maintained in a separated state until the connecting operation of the reinforcing bar is performed, so that the reinforcing bar fixing material can be stored for a long time, and the handleability of the reinforcing bar fixing material is improved. Further, since the first protective layer for protecting the main agent and the hardener in a separated state is broken by the contact between the reinforcing bar and the receiving member, the mixing operation of the main agent and the hardener is easy.
（特徴手段）
本発明に係る鉄筋の接続方法にあっては、前記鉄筋を、雄ネジ部を有するネジ鉄筋とし、前記受け部材を、前記雄ネジ部と羅合する雌ネジ部を備えたものとすることができる。
(Characteristic means)
In the method of connecting a reinforcing bar according to the present invention, the reinforcing bar may be a screw reinforcing bar having a male screw portion, and the receiving member may be provided with a female screw portion that engages with the male screw portion. it can.
（効果）
本方法のように、鉄筋と受け部材とを互いに羅合するものであれば、鉄筋の雄ネジ部と受け部材の雌ネジ部との摺動距離が長くなるため、鉄筋固定材が確実に破断して主剤と硬化剤との混合度合いが高まる。また、雄ネジ部と雌ネジ部との間にはほぼ一定形状の隙間が螺旋状に形成されるから、鉄筋固定材が当該隙間に沿って移動し易い。このため、雄ネジ部と雌ネジ部との螺合領域の全長に亘って充填材を確実に充填することができ、強度の高い接続部を得ることができる。
(effect)
If the reinforcing bar and the receiving member are joined to each other as in this method, the sliding distance between the male screw portion of the reinforcing bar and the female screw portion of the receiving member becomes longer, so that the reinforcing bar fixing material is reliably broken. As a result, the degree of mixing of the main agent and the curing agent increases. Further, since a substantially constant gap is spirally formed between the male screw part and the female screw part, the reinforcing bar fixing material is easily moved along the gap. For this reason, the filler can be reliably filled over the entire length of the threaded region between the male screw portion and the female screw portion, and a connection portion having high strength can be obtained.
（特徴手段）
本発明に係る鉄筋の接続方法にあっては、前記孔部に対する前記鉄筋の挿入に先立ち、前記鉄筋固定材を前記孔部に挿入して前記孔部の内面に向けて押し付ける工程を設けることができる。
(Characteristic means)
In the method of connecting a reinforcing bar according to the present invention, prior to the insertion of the reinforcing bar into the hole, a step of inserting the reinforcing bar fixing material into the hole and pressing it toward the inner surface of the hole may be provided. it can.
（効果）
仮に、鉄筋の外面に鉄筋固定材を巻き付けたのちに受け部材に螺合する場合、鉄筋固定材が雄ネジ部と雌ネジ部との隙間に入って行かず、受け部材の外部に溢れる可能性がある。しかし、本方法であれば、受け部材の雌ネジ部の側に先に鉄筋固定材を配置するから、鉄筋の螺合に際して鉄筋固定材が受け部材の外部に残されることがない。仮に、鉄筋固定材が鉄筋の先端面によって受け部材の内部に押し込まれた場合でも、鉄筋の端部が雌ネジ部の奥に到達することで充填材が雄ネジ部と雌ネジ部との隙間に沿って外側に流動することが期待でき、充填材は雄ネジ部と雌ネジ部との隙間に確実に充填されることとなる。
(effect)
If the reinforcing bar fixing material is wound around the outer surface of the reinforcing bar and then screwed to the receiving member, the reinforcing bar fixing material may not enter the gap between the male screw portion and the female screw portion and may overflow the receiving member. There is. However, according to this method, since the reinforcing bar fixing member is disposed first on the female screw portion side of the receiving member, the reinforcing bar fixing member does not remain outside the receiving member when the reinforcing bar is screwed. Even if the reinforcing bar fixing material is pushed into the receiving member by the tip of the reinforcing bar, the end of the reinforcing bar reaches the inside of the female screw portion, and the filler fills the gap between the male screw portion and the female screw portion. Can be expected to flow outward along the gap, and the filler is reliably filled in the gap between the male screw portion and the female screw portion.
〔第１実施形態〕
（概要）
本発明に係る鉄筋固定材３および当該鉄筋固定材３を用いた鉄筋１ａの接続方法につき、図面を参照しながら説明する。図１には、受け部材２に対し、ネジ鉄筋１の端部どうしを接続する例を示す。実際のＲＣ構造物における柱や梁には、この図で示すネジ鉄筋１の複数本が埋設される。よって、ネジ鉄筋１の設置姿勢は、図１のように水平方向に限らず任意である。また、二本の別のネジ鉄筋１どうしを接続することもあれば、環状に成形した一本のネジ鉄筋１の端部どうしを接続することもある。
[First Embodiment]
(Overview)
The reinforcing bar fixing member 3 according to the present invention and a method of connecting the reinforcing bar 1a using the reinforcing bar fixing member 3 will be described with reference to the drawings. FIG. 1 shows an example in which ends of the screw reinforcing bar 1 are connected to the receiving member 2. In a column or a beam in an actual RC structure, a plurality of screw reinforcing bars 1 shown in this figure are embedded. Therefore, the installation posture of the screw reinforcing bar 1 is not limited to the horizontal direction as shown in FIG. Further, two different screw reinforcing bars 1 may be connected to each other, or an end portion of one annularly formed screw reinforcing bar 1 may be connected to each other.
本実施形態においては、受け部材２の孔部２２に形成された雌ネジ部２１に、ネジ鉄筋１の表面に形成された雄ネジ部１１が螺合される。その際、図１に示すように、ネジ鉄筋１の端部に充填材Ｊを保持したシート状の鉄筋固定材３を巻き付ける。雄ネジ部１１と雌ネジ部２１との間には一定形状の隙間が螺旋状に形成されるから、ネジ鉄筋１を雌ネジ部２１に螺合する際には、鉄筋固定材３が当該隙間に沿って移動し易い。よって、雄ネジ部１１と雌ネジ部２１との螺合領域の全長に亘って充填材Ｊを確実に充填することができ、強度の高い接続部を得ることができる。 In the present embodiment, the male screw portion 11 formed on the surface of the screw rebar 1 is screwed into the female screw portion 21 formed in the hole 22 of the receiving member 2. At this time, as shown in FIG. 1, a sheet-shaped reinforcing steel fixing material 3 holding a filler J is wound around an end of the screw reinforcing steel 1. Since a gap having a predetermined shape is formed spirally between the male screw portion 11 and the female screw portion 21, when the screw reinforcing bar 1 is screwed into the female screw portion 21, the reinforcing bar fixing material 3 is attached to the gap. Easy to move along. Therefore, the filler J can be reliably filled over the entire length of the threaded region between the male screw portion 11 and the female screw portion 21, and a high-strength connection portion can be obtained.
（充填材）
図２（ａ）には、鉄筋固定材３の構成を示す。この鉄筋固定材３は一液タイプの充填材Ｊを備えている。充填材Ｊは、二枚の保護層で被覆され、全体がシート状に形成されている。具体的には、一方の第１保護層３１の表面に例えば流動性のある充填材Ｊが薄く塗布される。その上からもう一方の第２保護層３２を被せ、充填材Ｊの周囲に沿って例えば熱融着や粘着によって第１保護層３１と第２保護層３２を張り合わせ、図２（ｂ）に示すように封止部３５を形成する。これにより、充填材Ｊが密封された鉄筋固定材３が得られる。
(Filling material)
FIG. 2A shows the configuration of the reinforcing bar fixing member 3. The reinforcing bar fixing member 3 includes a one-component type filler J. The filler J is covered with two protective layers, and the whole is formed in a sheet shape. Specifically, for example, a flowable filler J is thinly applied to the surface of one first protective layer 31. The other second protective layer 32 is put on from above, and the first protective layer 31 and the second protective layer 32 are adhered along the periphery of the filler J by, for example, heat fusion or adhesion, as shown in FIG. The sealing portion 35 is formed as described above. Thereby, the reinforcing-bar fixing material 3 in which the filler J is sealed is obtained.
用いる充填材Ｊとしては、例えば、一液性の無機グラウト材がある。このような無機グラウト材としては、例えば、ＪＦＥ条鋼製の「ネジグラウトタイプＭ３」がある。このグラウト材は、例えば、粉末状のグラウト材と水とを５０：１２の質量比に混合して生成される。このグラウト材は、空気と触れることで次第に硬化する。よって、混合作業が終了し、流動性を有している状態で、グラウト材を第１保護層３１に塗布し、さらに、第２保護層３２で被覆して鉄筋固定材３を形成する。 As the filler J used, for example, a one-part inorganic grout material is used. As such an inorganic grout material, for example, there is “screw grout type M3” made of JFE section steel. This grout material is produced, for example, by mixing a powdery grout material and water in a mass ratio of 50:12. The grout material gradually hardens upon contact with air. Thus, the grouting material is applied to the first protective layer 31 in a state where the mixing operation is completed and has fluidity, and further the second protective layer 32 is formed to form the reinforcing bar fixing material 3.
（保護層）
第１保護層３１および第２保護層３２は、充填材Ｊの硬化を遅延させるために気密性を有すると共に、ネジ鉄筋１の螺合時には容易に破断する必要がある。これら両方の特性は相反するものであるが、特に破断の容易性を考慮することで好適な鉄筋固定材３を得ることができる。
(Protective layer)
The first protective layer 31 and the second protective layer 32 must be airtight to delay the hardening of the filler J, and must be easily broken when the screw reinforcing bar 1 is screwed. Although these two properties are contradictory, it is possible to obtain a suitable reinforcing steel fixing material 3 in consideration of easiness of breakage.
例えば破断容易な樹脂膜を形成するには、特定方向の引張強さを下げることが考えられる。そのような第１の材料としては、アイオノマー樹脂を押し出し製造する際に、長手方向に延伸を加えて製造したフィルムがある。このような延伸によって炭化水素鎖が延伸方向に配向する一方で、幅方向には結合力の弱い金属イオンによる結合が生じる。この結果、幅方向に裂けやすいフィルムになる。 For example, in order to form a resin film that is easily broken, it is conceivable to lower the tensile strength in a specific direction. As such a first material, there is a film produced by stretching in the longitudinal direction when an ionomer resin is extruded and produced. By such stretching, the hydrocarbon chains are oriented in the stretching direction, while bonding in the width direction is caused by metal ions having a weak bonding force. As a result, the film is apt to tear in the width direction.
第２の材料は、低分子量の高密度ポリエチレンを低速で押し出し、幅方向の膨張度を高めつつ膨らませるインフレーションを行なうことで、幅方向に延伸を加えたフィルムである。こうして得られたフィルムは幅方向に破断し易くなる。 The second material is a film that is stretched in the width direction by extruding low-molecular-weight high-density polyethylene at a low speed and inflating while increasing the degree of expansion in the width direction. The film thus obtained is easily broken in the width direction.
第３の材料は、例えばメルトマスフローレート（ＭＦＲ）が１０以上の高密度ポリエチレンがある。これによるフィルムは脆くなり裂け易くなる。因みに、ＭＦＲは、シリンダーの中に樹脂を入れ、１９０℃に加熱した状態で２．１６ｋｇの荷重を掛けたとき、細孔から１０分間に流出する樹脂の重さ（ｇ）を意味する。 The third material is, for example, high-density polyethylene having a melt mass flow rate (MFR) of 10 or more. The resulting film becomes brittle and easily tears. Incidentally, the MFR means the weight (g) of the resin flowing out of the pores for 10 minutes when a load of 2.16 kg is applied while the resin is placed in a cylinder and heated to 190 ° C.
本実施形態の鉄筋固定材３にあっては、第１保護層３１および第２保護層３２は、例えば、自身の平面に沿う非平行な二つの方向において異なる引張強度を備えている。第１保護層３１および第２保護層３２の夫々において、最小の引張強度が得られる方向を鉄筋固定材３の一辺と平行なＸ方向に一致させる。 In the reinforcing-bar fixing material 3 of the present embodiment, the first protective layer 31 and the second protective layer 32 have different tensile strengths in, for example, two non-parallel directions along their plane. In each of the first protective layer 31 and the second protective layer 32, the direction in which the minimum tensile strength is obtained is made to coincide with the X direction parallel to one side of the reinforcing bar fixing member 3.
ただし、図２（ｂ）に示すように、第１保護層３１における最小引張強度方向Ｘ１と、第２保護層３２における最小引張強度方向Ｘ２とは、厳密に一致する必要はない。互いの方向の角度差が予め設定した許容角度α以内であれば、第１保護層３１と第２保護層３２とは実質的に同時に破断することとなる。因みに、当該許容角度αは、例えば１５度である。 However, as shown in FIG. 2B, the minimum tensile strength direction X1 of the first protective layer 31 and the minimum tensile strength direction X2 of the second protective layer 32 do not need to exactly match. If the angle difference between the directions is within the preset allowable angle α, the first protective layer 31 and the second protective layer 32 break substantially simultaneously. Incidentally, the permissible angle α is, for example, 15 degrees.
これらの最小引張強度方向Ｘ１およびＸ２は、例えば、鉄筋固定材３をネジ鉄筋１に巻き付ける際に、ネジ鉄筋１の雄ネジ部１１のネジ溝の延出方向に対して交差する方向に設定しておく。そうすることで、ネジ鉄筋１を回転させる際に、鉄筋固定材３は双方のネジ溝の隙間の形状に沿うように変形して最小引張強度方向Ｘ１およびＸ２に引き伸ばされ、鉄筋固定材３の破断が促進されて、充填材Ｊが素早く放出される。 These minimum tensile strength directions X1 and X2 are set, for example, in a direction intersecting the extending direction of the thread groove of the male screw portion 11 of the screw reinforcing bar 1 when the reinforcing bar fixing material 3 is wound around the screw reinforcing bar 1. Keep it. By doing so, when rotating the screw reinforcing bar 1, the reinforcing bar fixing material 3 is deformed along the shape of the gap between both screw grooves, and is stretched in the minimum tensile strength directions X1 and X2. The rupture is accelerated, and the filler J is released quickly.
このような材料を用いて形成する保護層の厚みは、例えば、数十ミクロンである。これに充填材Ｊを含めて全体の厚みは０．５ｍｍ程度かそれよりも薄く形成される。尚、後述する粘着層Ｎが付加される場合には、さらに数十ミクロンの厚みが付加される。 The thickness of the protective layer formed using such a material is, for example, several tens of microns. The entire thickness including the filler J is formed to be about 0.5 mm or thinner. When an adhesive layer N described later is added, a thickness of several tens of microns is further added.
（粘着層）
第１保護層３１あるいは第２保護層３２の表面には粘着層Ｎを設けておくと便利である。その場合、粘着層Ｎの表面は、鉄筋固定材３の使用に際して取り外し可能な第３保護層３３で被覆しておく。粘着層Ｎを備えることで、鉄筋固定材３を例えばネジ鉄筋１や受け部材２の表面に仮止めすることができ、ネジ鉄筋１の姿勢が任意となり、充填材Ｊの配設作業が容易となる。
(Adhesive layer)
It is convenient to provide an adhesive layer N on the surface of the first protective layer 31 or the second protective layer 32. In that case, the surface of the adhesive layer N is covered with a third protective layer 33 which is removable when the reinforcing bar fixing material 3 is used. By providing the adhesive layer N, the reinforcing bar fixing member 3 can be temporarily fixed to, for example, the surface of the screw reinforcing bar 1 or the receiving member 2, and the posture of the screw reinforcing bar 1 becomes arbitrary, thereby facilitating the work of disposing the filler J. Become.
（施工方法）
図１に示すように、鉄筋固定材３は、通常は、ネジ鉄筋１の周囲に一層巻き付ける。鉄筋固定材３を巻き付けたとき、鉄筋固定材３の端部どうしが互いに届かずネジ鉄筋１の表面が見える場合には、充填材Ｊがネジ鉄筋１の全周に配設されず、所期の接続強度が得られない場合がある。一方、鉄筋固定材３が多層に重なる状態に巻き付けられた場合には、ネジ鉄筋１を受け部材２に螺合する際に鉄筋固定材３の一部が受け部材２の外部に取り残されるおそれがある。鉄筋固定材３は、ちょうど一層だけ巻き付けるのが理想であるが、その場合には充填材Ｊの総量が規定される。よって、接続するネジ鉄筋１と受け部材２との隙間寸法などを勘案して鉄筋固定材３に保持させる充填材Ｊの分量を調節するのが望ましい。
(Construction method)
As shown in FIG. 1, the reinforcing bar fixing material 3 is usually wound around the threaded reinforcing bar 1 further. When the reinforcing bar fixing member 3 is wound, if the ends of the reinforcing bar fixing member 3 do not reach each other and the surface of the screw reinforcing bar 1 can be seen, the filler J is not provided on the entire circumference of the screw reinforcing bar 1, Connection strength may not be obtained. On the other hand, when the reinforcing bar fixing material 3 is wound so as to overlap in a multilayer manner, a part of the reinforcing bar fixing material 3 may be left outside the receiving member 2 when screwed into the receiving member 2. is there. Ideally, just one layer of the reinforcing bar fixing material 3 is wound. In this case, the total amount of the filler J is defined. Therefore, it is desirable to adjust the amount of the filler J held by the reinforcing-bar fixing material 3 in consideration of the gap size between the screw reinforcing bar 1 and the receiving member 2 to be connected.
鉄筋固定材３の寸法のうち、ネジ鉄筋１の長手方向に沿う寸法は、ネジ鉄筋１が受け部材２の内部に挿入される長さか、それよりも少し長めに設定しておく。これにより、適量の充填材Ｊが両者の隙間に充填される。尚、充填材Ｊの硬化に際して充填材Ｊの膨張率が大きい場合には、ネジ鉄筋１の長手方向に沿う鉄筋固定材３の長さはネジ鉄筋１の挿入長さよりも短くてよい。また、図１に示すように、ネジ鉄筋１の表面に巻き付けた鉄筋固定材３の端部のうちネジ鉄筋１の端部から遠い側の端部３ａの位置を、ネジ鉄筋１の表面に付した挿入深さを示すマーク１２に合わせておくとネジ鉄筋１の挿入深さが正確となる。 Among the dimensions of the reinforcing bar fixing member 3, the dimension along the longitudinal direction of the screw reinforcing bar 1 is set to be a length at which the screw reinforcing bar 1 is inserted into the receiving member 2 or slightly longer. Thereby, an appropriate amount of the filler J is filled in the gap between the two. In the case where the expansion rate of the filler J during curing of the filler J is large, the length of the reinforcing bar fixing material 3 along the longitudinal direction of the screw reinforcing bar 1 may be shorter than the insertion length of the screw reinforcing bar 1. Also, as shown in FIG. 1, the position of the end 3 a of the end of the reinforcing bar fixing material 3 wound around the surface of the screw bar 1, which is farther from the end of the screw bar 1, is attached to the surface of the screw bar 1. When the screw 12 is aligned with the mark 12 indicating the insertion depth, the insertion depth of the screw reinforcing bar 1 becomes accurate.
図３に示すように鉄筋固定材３を巻き付けたネジ鉄筋１は、受け部材２に羅合させる。既に一方のネジ鉄筋１が所定位置に設置されている場合には、当該ネジ鉄筋１に対して受け部材２を羅合させ、さらに別のネジ鉄筋１を螺合させる。図４は、二本のネジ鉄筋１の接続が終了した状態である。 As shown in FIG. 3, the screw reinforcing bar 1 around which the reinforcing bar fixing member 3 is wound is joined to the receiving member 2. When one screw reinforcing bar 1 is already installed at a predetermined position, the receiving member 2 is engaged with the screw reinforcing bar 1 and another screw reinforcing bar 1 is further screwed. FIG. 4 shows a state in which the connection of the two screw rebars 1 has been completed.
（通気孔）
本実施形態の場合、充填材Ｊはネジ鉄筋１の螺合と同時に受け部材２の内部に充填される。よって、従来の受け部材２のように、ネジ鉄筋１を螺合させた後に充填材Ｊを注入する充填孔を受け部材２の側面に設ける必要はない。ただし、受け部材２の内部の空気を排出する通気孔２３を設けておくのが好ましい。即ち、本実施形態の場合、ネジ鉄筋１を受け部材２に螺合させ始めると直ちに雄ネジ部１１と雌ネジ部２１との隙間が鉄筋固定材３で密封され、受け部材２の内部の空間が閉じた空間となる。その場合、ネジ鉄筋１の螺合に伴って受け部材２の内部の圧力が高まり、充填材Ｊが押し戻される可能性がある。
(Vent)
In the case of the present embodiment, the filler J is filled into the receiving member 2 at the same time when the screw reinforcing bar 1 is screwed. Therefore, unlike the conventional receiving member 2, there is no need to provide a filling hole for injecting the filling material J after the screw reinforcing bar 1 is screwed into the side surface of the receiving member 2. However, it is preferable to provide a ventilation hole 23 for discharging the air inside the receiving member 2. That is, in the case of the present embodiment, the gap between the male screw portion 11 and the female screw portion 21 is immediately sealed with the reinforcing bar fixing material 3 as soon as the screw rebar 1 starts to be screwed into the receiving member 2, and the space inside the receiving member 2 is formed. Becomes a closed space. In this case, the internal pressure of the receiving member 2 increases with the screwing of the screw rebar 1, and the filler J may be pushed back.
よって、図１および図３、図４に示すように、受け部材２の長手方向の中間位置に、雌ネジ部２１と外部とを連通する少なくとも一つの通気孔２３を設けておくとよい。この通気孔２３は、従来の充填材Ｊを注入する孔を利用するものであっても良いし、それよりも小径の孔であってもよい。 Therefore, as shown in FIGS. 1, 3, and 4, at least one ventilation hole 23 that communicates the female screw portion 21 with the outside may be provided at an intermediate position in the longitudinal direction of the receiving member 2. The vent hole 23 may use a conventional hole into which the filler J is injected, or may be a hole having a smaller diameter.
このように本実施形態の鉄筋固定材３を用いることで、互いに接続するネジ鉄筋１と受け部材２との間に充填材Ｊを効率よく配置することができる。よって、ネジ鉄筋１の接続箇所や接続方向が様々であっても、また、ネジ鉄筋１の先端部が作業者の位置に比べて高所に位置するなど作業者の手が届き難い場所であっても接続作業が極めて容易となる。 As described above, by using the reinforcing bar fixing member 3 of the present embodiment, the filler J can be efficiently arranged between the screw reinforcing bar 1 and the receiving member 2 connected to each other. Therefore, even if the connection locations and connection directions of the screw rebar 1 are various, the location of the hand of the worker is difficult, for example, the tip of the screw rebar 1 is located at a higher position than the position of the worker. Even so, the connection work becomes extremely easy.
〔第２実施形態〕
図５（ａ）に示すように、鉄筋固定材３の充填材Ｊを主剤Ｊ１と硬化剤Ｊ２とで構成することもできる。この場合、第１保護層３１と第２保護層３２との間に仕切層３４を設ける。即ち、主剤Ｊ１を仕切層３４と第１保護層３１との間に配置し、硬化剤Ｊ２を仕切層３４と第２保護層３２との間に配置する。図５（ｂ）に示すように、鉄筋固定材３の周囲には、融着や粘着などによって各層が互いに接合された封止部３５が形成される。
[Second embodiment]
As shown in FIG. 5A, the filler J of the reinforcing bar fixing material 3 may be composed of a main agent J1 and a hardener J2. In this case, a partition layer 34 is provided between the first protective layer 31 and the second protective layer 32. That is, the main agent J1 is disposed between the partition layer 34 and the first protective layer 31, and the curing agent J2 is disposed between the partition layer 34 and the second protective layer 32. As shown in FIG. 5B, a sealing portion 35 in which the respective layers are joined to each other by fusion or adhesion is formed around the reinforcing bar fixing material 3.
第１保護層３１および第２保護層３２、仕切層３４の厚みは、第１実施形態と同様に夫々数十ミクロンである。主剤Ｊ１の体積と硬化剤Ｊ２の体積とが異なる場合があるものの、主剤Ｊ１および硬化剤Ｊ２を含めて全体の厚みは０．５ｍｍ程度かそれよりも薄く形成される。尚、粘着層Ｎが付加される場合には、さらに数十ミクロンの厚みが付加される。 The thicknesses of the first protective layer 31, the second protective layer 32, and the partition layer 34 are each several tens of microns as in the first embodiment. Although the volume of the main agent J1 and the volume of the hardener J2 may be different, the entire thickness including the main agent J1 and the hardener J2 is formed to be about 0.5 mm or thinner. When the adhesive layer N is added, a thickness of several tens of microns is further added.
また、第１保護層３１および第２保護層３２、仕切層３４の最小引張強度方向は、原則として一致させる。その方が、ネジ鉄筋１の螺合時に各層が同時に破断し易くなり、主剤Ｊ１と硬化剤Ｊ２との混合が確実に行われるからである。ただし、図５（ｂ）に示すように、第１保護層３１における最小引張強度方向Ｘ１と、第２保護層３２における最小引張強度方向Ｘ２と、仕切層３４における最小引張強度方向Ｘ３とは、厳密に一致する必要はない。互いの方向の角度差が予め設定した許容角度α以内であれば、各層は実質的に同時に破断する。因みに、当該許容角度αは、例えば１５度である。 In addition, the directions of the minimum tensile strength of the first protective layer 31, the second protective layer 32, and the partition layer 34 are made to coincide in principle. This is because each layer is easily broken at the same time when the screw reinforcing bar 1 is screwed, and the mixing of the main agent J1 and the hardening agent J2 is surely performed. However, as shown in FIG. 5B, the minimum tensile strength direction X1 of the first protective layer 31, the minimum tensile strength direction X2 of the second protective layer 32, and the minimum tensile strength direction X3 of the partition layer 34 are: There is no need to match exactly. If the angle difference between the directions is within the preset allowable angle α, the layers break substantially simultaneously. Incidentally, the permissible angle α is, for example, 15 degrees.
さらに、図５（ａ）に示すように、例えば、第２保護層３２の表面に粘着層Ｎを設けておくと便利である。勿論、第１保護層３１の表面であっても良い。粘着層Ｎの表面には、粘着層Ｎの利用に際して取り外し可能な第３保護層３３を設けておく。このように粘着層Ｎを設けることで、鉄筋固定材３を予めネジ鉄筋１に貼り付けておくことができ、ネジ鉄筋１の接続作業の姿勢が任意となり、充填材Ｊの充填作業が容易となる。 Further, as shown in FIG. 5A, for example, it is convenient to provide an adhesive layer N on the surface of the second protective layer 32. Of course, it may be the surface of the first protective layer 31. On the surface of the adhesive layer N, a third protective layer 33 that is removable when the adhesive layer N is used is provided. By providing the adhesive layer N in this manner, the reinforcing bar fixing material 3 can be pasted to the screw reinforcing bar 1 in advance, and the connection work of the screw reinforcing bar 1 becomes arbitrary, and the filling operation of the filler J is facilitated. Become.
用いる充填材Ｊとしては、例えば、ＪＦＥ条鋼製の二液性有機グラウト材である「ネジグラウトタイプＹ」がある。この有機グラウト材は、主剤Ｊ１と硬化剤Ｊ２とを２：１の体積比率で混合する。二液性であれば、ネジ鉄筋１の接続作業が終了した後に硬化が開始するから、鉄筋固定材３の長期管理が容易となる。 As the filler J to be used, for example, there is a “thread grout type Y” which is a two-component organic grout material made of JFE bar steel. In this organic grout material, the main agent J1 and the curing agent J2 are mixed at a volume ratio of 2: 1. If it is two-component, hardening starts after the connection work of the screw reinforcing bar 1 is completed, so that long-term management of the reinforcing bar fixing material 3 becomes easy.
尚、この有機グラウト材は、第１保護層３１等が破断され主剤Ｊ１が空気に触れることで徐々に硬化が始まる。よって、この有機グラウト材の場合、硬化剤Ｊ２は硬化時間の調節に利用可能である。また、この有機グラウト材は、主剤Ｊ１および硬化剤Ｊ２が硬化時に膨張する。よって、ネジ鉄筋１と受け部材２との隙間が確実に充填され、強固な接続部を得ることができる。 The organic grout material gradually starts to cure when the first protective layer 31 and the like are broken and the main agent J1 comes into contact with air. Therefore, in the case of this organic grout material, the curing agent J2 can be used for adjusting the curing time. Further, in this organic grout material, the main agent J1 and the curing agent J2 expand when cured. Therefore, the gap between the screw reinforcing bar 1 and the receiving member 2 is reliably filled, and a strong connection portion can be obtained.
本実施形態の鉄筋固定材３を用いることで、互いに接続するネジ鉄筋１と受け部材２との間に二液性の充填材Ｊを簡単に配置し、効率的に混合することができる。よって、ネジ鉄筋１の接続箇所など、ネジ鉄筋１の配置方向が様々で、また、高所での接続が必要になるなど作業者の手が届き難い場所での接続作業が極めて容易となる。 By using the reinforcing bar fixing member 3 of the present embodiment, the two-component filler J can be easily arranged between the screw reinforcing bar 1 and the receiving member 2 connected to each other, and can be efficiently mixed. Therefore, the connection work of the screw reinforcing bar 1 in various places such as the connection position of the screw reinforcing bar 1 and the like, and connection at a high place is required, so that a worker can easily connect in a place where it is difficult to reach the worker.
〔第３実施形態〕
図６（ａ）（ｂ）に示すように、二液性の充填材Ｊを用いる場合には、鉄筋固定材３を一枚の共通保護層３１ａを用いて構成することもできる。つまり、主剤Ｊ１および硬化剤Ｊ２を包持する部材として、上述の第１保護層３１および仕切層３４、第２保護層３２の代わりに、一枚の共通保護層３１ａを折り重ね、その間に主剤Ｊ１と硬化剤Ｊ２とを挟むものとする。
[Third embodiment]
As shown in FIGS. 6A and 6B, when the two-component filler J is used, the reinforcing bar fixing member 3 can be configured by using a single common protective layer 31a. In other words, instead of the first protective layer 31, the partition layer 34, and the second protective layer 32, a single common protective layer 31a is folded as a member for enclosing the main agent J1 and the curing agent J2, and the main agent J1 It is assumed that J1 and the curing agent J2 are sandwiched.
作製においては、図６（ａ）に示すように、まず、所定長さの共通保護層３１ａを伸ばした状態とし、一方の端部近傍の所定の領域に主剤Ｊ１を塗布する。続いて、共通保護層３１ａを主剤Ｊ１の上に折り返し、主剤Ｊ１を挟み込む。さらに、共通保護層３１ａの表面に対し、主剤Ｊ１を塗布した領域と重なる状態に硬化剤Ｊ２を塗布したのち、硬化剤Ｊ２の表面を覆うように共通保護層３１ａを折り返す。最後に、主剤Ｊ１および硬化剤Ｊ２の周囲の領域につき、重なった共通保護層３１ａどうしを融着や粘着によって密封し、封止部３５を形成する。 In the fabrication, as shown in FIG. 6A, first, the common protective layer 31a having a predetermined length is extended, and the main agent J1 is applied to a predetermined region near one end. Subsequently, the common protective layer 31a is folded over the main agent J1 to sandwich the main agent J1. Further, after applying the hardener J2 to the surface of the common protective layer 31a so as to overlap the region where the main agent J1 is applied, the common protective layer 31a is turned over so as to cover the surface of the hardener J2. Finally, in the area around the main agent J1 and the curing agent J2, the overlapping common protective layers 31a are sealed with each other by fusion or adhesion to form a sealing portion 35.
図６（ｂ）に示すように、共通保護層３１ａの最小引張強度方向Ｘ４を、例えば、共通保護層３１ａの折曲線３６に沿うＸ方向に設定することで、形成された３層の夫々における最小引張強度方向Ｘ４が上手く一致する。勿論、最小引張強度方向Ｘ４は、図６におけるＸ方向と垂直なＹ方向に沿わせるものでもよい。 As shown in FIG. 6B, the minimum tensile strength direction X4 of the common protective layer 31a is set, for example, in the X direction along the fold curve 36 of the common protective layer 31a, so that each of the three formed layers is formed. The minimum tensile strength direction X4 matches well. Of course, the minimum tensile strength direction X4 may be along the Y direction perpendicular to the X direction in FIG.
本構成であれば、充填材Ｊを保護すべき部材の部品数が削減され、鉄筋固定材３の構成が簡略化される。また、ネジ鉄筋１の螺合に際して破断し易い鉄筋固定材３を容易に得ることができる。 With this configuration, the number of components for protecting the filler J is reduced, and the configuration of the reinforcing bar fixing member 3 is simplified. In addition, the rebar fixing member 3 that is easily broken when the screw rebar 1 is screwed can be easily obtained.
〔第４実施形態〕
図７に示すように、二本のネジ鉄筋１を接続できる受け部材２としては、中央位置に壁部２４を設けておいても良い。本構成であれば、夫々のネジ鉄筋１を壁部２４に当接するまで螺入させせることができ、ネジ鉄筋１の螺合深さが簡単に決定できる。
[Fourth embodiment]
As shown in FIG. 7, as the receiving member 2 to which the two screw reinforcing bars 1 can be connected, a wall portion 24 may be provided at a central position. With this configuration, each screw reinforcing bar 1 can be screwed in until it comes into contact with the wall portion 24, and the screwing depth of the screw reinforcing bar 1 can be easily determined.
図７に示すように、夫々の雌ネジ部２１においては壁部２４の近傍に通気孔２３を設けておくと良い。また、他の構成としては、壁部２４に第２通気孔２３ａを設けておいても良い。この場合には、通気孔２３の一方は省略可能である。ただし、ネジ鉄筋１の接続に際しては、通気孔２３を設けていない側の雌ネジ部２１から接続作業を行うと、まず、当該側の雌ネジ部２１の空気が第２通気孔２３ａを介して排出され、続く他方の雌ネジ部２１の接続に際しては、通気孔２３を介して排気が円滑に行える。 As shown in FIG. 7, a vent hole 23 is preferably provided in the vicinity of the wall portion 24 in each female screw portion 21. Further, as another configuration, a second ventilation hole 23a may be provided in the wall portion 24. In this case, one of the ventilation holes 23 can be omitted. However, when connecting the threaded reinforcing bar 1, if the connection operation is performed from the female screw portion 21 on the side where the ventilation hole 23 is not provided, first, the air of the female screw portion 21 on the side is passed through the second ventilation hole 23 a. When the female screw portion 21 is discharged and subsequently connected, the exhaust can be smoothly performed through the vent hole 23.
ただし、このような通気孔２３および第２通気孔２３ａは必須の構成ではない。仮に鉄筋固定材３が雄ネジ部１１と雌ネジ部２１との隙間を密封し、受け部材２の内部に空気が閉じ込められた場合でも、硬化前の充填材Ｊは所定の流動性を有する。よって、ネジ鉄筋１を引き続き螺合させることで、圧力の上昇した空気の一部が充填材Ｊを押しのけて外部に排出される。 However, the ventilation holes 23 and the second ventilation holes 23a are not essential components. Even if the reinforcing bar fixing material 3 seals the gap between the male screw portion 11 and the female screw portion 21 and air is trapped inside the receiving member 2, the filler J before curing has a predetermined fluidity. Therefore, by continuously screwing the screw rebar 1, a part of the air having increased pressure pushes the filler J and is discharged to the outside.
〔第５実施形態〕
図８に示すように、受け部材２に対するネジ鉄筋１の螺合に先立ち、鉄筋固定材３を受け部材２の内部に挿入して、雌ネジ部２１に向けて押し付けておいてもよい。図８は、天井スラブ４に埋設された受け部材２にネジ鉄筋１を接続する様子を示している。図８（ａ）（ｂ）に示すように、雌ネジ部２１の内部に鉄筋固定材３のみを配置し、雌ネジ部２１の内径よりも小さな外径を有する押え棒５を用いて鉄筋固定材３を雌ネジ部２１に押し付けるのが好ましい。
[Fifth Embodiment]
As shown in FIG. 8, prior to screwing of the screw reinforcing bar 1 into the receiving member 2, the reinforcing bar fixing member 3 may be inserted into the receiving member 2 and pressed toward the female screw portion 21. FIG. 8 shows how the screw reinforcing bar 1 is connected to the receiving member 2 embedded in the ceiling slab 4. As shown in FIGS. 8A and 8B, only the reinforcing bar fixing member 3 is arranged inside the female screw portion 21, and the reinforcing bar is fixed using the presser bar 5 having an outer diameter smaller than the inner diameter of the female screw portion 21. It is preferable to press the material 3 against the female screw portion 21.
ただし、このような押え棒５を用いなくても、鉄筋固定材３を雌ネジ部２１の内部に挿入したあと、少なくとも雌ネジ部２１の開口端部２１ａにおいて雄ネジ部１１と雌ネジ部２１とで鉄筋固定材３を挟む状態にすると、その後の雄ネジ部１１の螺合によって鉄筋固定材３は、順次、雄ネジ部１１と雌ネジ部２１との隙間に充填される。しかしながら、鉄筋固定材３が雄ネジ部１１と雌ネジ部２１との隙間にうまく充填されず、鉄筋固定材３の形状が乱れてネジ鉄筋１の端部に押され、雌ネジ部２１の底部に押し込まれる場合もある。この場合には、さらにネジ鉄筋１を螺入することで、鉄筋固定材３は雄ネジ部１１の先端で押しつぶされ、充填材Ｊが雄ネジ部１１と雌ネジ部２１との隙間を介して雌ネジ部２１の開口端部２１ａに向けて押し出される。このように、雌ネジ部２１の内部に予め鉄筋固定材３を配置しておくことで、図８（ｃ）に示すように、充填材Ｊを雄ネジ部１１と雌ネジ部２１との隙間に確実に充填することができる。 However, even if such a holding rod 5 is not used, after the reinforcing bar fixing member 3 is inserted into the female screw portion 21, at least at the open end 21 a of the female screw portion 21, the male screw portion 11 and the female screw portion 21 are formed. When the reinforcing bar fixing member 3 is sandwiched between the reinforcing member fixing member 3 and the male screw portion 11, the reinforcing bar fixing member 3 is sequentially filled in the gap between the male screw portion 11 and the female screw portion 21 by screwing of the male screw portion 11. However, the reinforcing bar fixing member 3 is not filled in the gap between the male screw portion 11 and the female screw portion 21, and the shape of the reinforcing bar fixing member 3 is disturbed and pushed by the end of the screw reinforcing bar 1. It may be pushed into. In this case, by further screwing in the screw reinforcing bar 1, the reinforcing bar fixing member 3 is crushed at the tip of the male screw portion 11, and the filler J is passed through the gap between the male screw portion 11 and the female screw portion 21. The female screw 21 is pushed out toward the open end 21 a. In this way, by arranging the reinforcing bar fixing material 3 inside the female screw portion 21 in advance, as shown in FIG. 8C, the filler J is filled in the gap between the male screw portion 11 and the female screw portion 21. Can be reliably filled.
尚、図８の受け部材２は、ネジ鉄筋１を下方から羅合させる際には既に天井スラブ４に埋設されている。よって、この受け部材２には通気孔２３を設けていない。鉄筋固定材３が、仮に受け部材２の内部に空気を閉じ込めた場合でも、硬化前の充填材Ｊは空気を逃がすように流動可能であり、ネジ鉄筋１の螺合は特に問題なく実施可能である。 The receiving member 2 shown in FIG. 8 is already embedded in the ceiling slab 4 when the screw reinforcing bar 1 is joined from below. Therefore, the receiving member 2 is not provided with the ventilation hole 23. Even if the reinforcing bar fixing material 3 traps air inside the receiving member 2, the filler J before curing can flow so as to release the air, and the screwing of the screw reinforcing bar 1 can be performed without any problem. is there.
〔第６実施形態〕
図９に示すように、鉄筋固定材３をロール状に構成しておいてもよい。この鉄筋固定材３は使用に際してネジ鉄筋１の外面に巻き付ける。鉄筋固定材３の巻き付け方向、あるいは、巻き付けピッチは、鉄筋固定材３に用いた各保護層の引裂き特性に応じて決定すればよい。例えば、鉄筋固定材３の引裂き強度の弱い方向を鉄筋固定材３の幅方向に設定している場合には、鉄筋固定材３は、概ね雄ネジ部１１のネジ溝の方向に沿って螺旋状に巻き付けるのが良い。こうすることで、雄ネジ部１１を雌ネジ部２１に羅合する際に、鉄筋固定材３は双方のネジ溝の隙間の形状に沿うように変形して幅方向に引き伸ばされ、鉄筋固定材３の破断が促進される。
[Sixth embodiment]
As shown in FIG. 9, the reinforcing bar fixing member 3 may be formed in a roll shape. The reinforcing bar fixing material 3 is wound around the outer surface of the screw reinforcing bar 1 in use. The winding direction or the winding pitch of the reinforcing bar fixing member 3 may be determined according to the tearing characteristics of each protective layer used for the reinforcing bar fixing member 3. For example, when the direction in which the reinforcing strength of the reinforcing material fixing material 3 is weak is set in the width direction of the reinforcing material fixing material 3, the reinforcing material fixing material 3 has a spiral shape substantially along the direction of the thread groove of the male screw portion 11. It is good to wrap around. By doing so, when the male screw portion 11 is engaged with the female screw portion 21, the reinforcing bar fixing material 3 is deformed along the shape of the gap between the two screw grooves and is stretched in the width direction. 3 is accelerated.
尚、この他にも、雄ネジ部１１および雌ネジ部２１のピッチやネジ溝深さなどの形状、さらには、鉄筋固定材３の引裂き特性等に応じて、鉄筋固定材３の巻き付け態様を変更すると良い。 In addition, in addition to the above, depending on the shape of the male screw portion 11 and the female screw portion 21 such as the pitch and thread groove depth, and the tearing characteristics of the reinforcing bar fixing material 3, the winding mode of the reinforcing bar fixing material 3 may be changed. Good to change.
また、鉄筋固定材３は、雄ネジ部１１に螺旋状に巻き付けるものでも良いし、鉄筋固定材３の長手方向をネジ鉄筋１の長手方向に直交させて、鉄筋固定材３の幅単位で複数箇所に巻き付けるものでもよい。何れの場合も、隣接するピッチの鉄筋固定材３の側縁部どうしが重ならないようにすると、充填材Ｊが雄ネジ部１１と雌ネジ部２１との隙間に充填され易くなって好ましい。 Further, the reinforcing bar fixing member 3 may be wound around the male screw portion 11 in a spiral shape, or a plurality of reinforcing bar fixing members 3 may be arranged in a width unit of the reinforcing bar fixing member 3 so that the longitudinal direction of the reinforcing bar fixing member 3 is orthogonal to the longitudinal direction of the screw reinforcing bar 1. It may be wound around a point. In any case, it is preferable that the side edges of the reinforcing bar fixing members 3 of adjacent pitches do not overlap with each other, because the filler J easily fills the gap between the male screw portion 11 and the female screw portion 21.
〔その他の実施形態〕
接続する鉄筋１ａとしては、ネジ鉄筋１の他に通常の節を有する鉄筋１ａを用いることもできる。この場合、受け部材２の内部には、充填材Ｊの係合機能を高めるために雌ネジ部２１ではなく何らかの凹凸形状を設けておくのが良い。その場合には、使用する充填材Ｊの膨張率や強度を高めておくと鉄筋１ａの抜け出し防止機能が向上する。
[Other embodiments]
As the reinforcing bar 1a to be connected, in addition to the screw reinforcing bar 1, a reinforcing bar 1a having a normal joint can be used. In this case, in order to enhance the engagement function of the filler J, it is preferable to provide some concave / convex shape inside the receiving member 2 instead of the female screw portion 21. In this case, if the expansion rate and strength of the filler J used are increased, the function of preventing the reinforcing bar 1a from coming off is improved.
本発明の鉄筋固定材および当該鉄筋固定材を用いた鉄筋の接続方法は、鉄筋を受け部材に挿入し、充填材で固定する鉄筋の接続部に広く適用可能である。 INDUSTRIAL APPLICABILITY The reinforcing bar fixing material of the present invention and a method of connecting a reinforcing bar using the reinforcing bar fixing material can be widely applied to a connecting portion of a reinforcing bar inserted into a receiving member and fixed with a filler.
１ ネジ鉄筋
１ａ 鉄筋
１１ 雄ネジ部
２ 受け部材
２１ 雌ネジ部
２２ 孔部
３ 鉄筋固定材
３１ 第１保護層
３２ 第２保護層
３３ 第３保護層
Ｊ 充填材
Ｊ１ 主剤
Ｊ２ 硬化剤
Ｎ 粘着層
Ｘ１ 第１方向
Ｘ２ 第２方向
REFERENCE SIGNS LIST 1 screw reinforcing bar 1 a reinforcing bar 11 male screw portion 2 receiving member 21 female screw portion 22 hole portion 3 reinforcing bar fixing material 31 first protective layer 32 second protective layer 33 third protective layer J Filler J1 Main agent J2 Hardener N Adhesive layer X1 First direction X2 Second direction
Claims (9)
前記平面に垂直な方向視において、前記第１方向と前記第２方向とのなす角度が予め設定した角度以内である請求項１から４の何れか一項に記載の鉄筋固定材。 The first protective layer has a first direction as a direction in which the tensile strength is minimized in a direction along a plane of each of the first protective layer and the second protective layer, and the second protective layer has a second direction. Has,
The rebar fixing material according to any one of claims 1 to 4, wherein an angle formed between the first direction and the second direction is within a preset angle when viewed in a direction perpendicular to the plane.
充填材を保護層で被覆しつつシート状に形成した鉄筋固定材を、
前記鉄筋の外面あるいは前記受け部材の内面のうち少なくとも何れか一方に取付け、
前記鉄筋を前記受け部材に挿入させつつ前記保護層を破断させて前記充填材を硬化させる鉄筋の接続方法。 When inserting the end of the reinforcing bar having an uneven shape on the surface into the receiving member having a hole to connect the reinforcing bar and the receiving member,
Reinforcing material formed into a sheet while covering the filler with a protective layer,
Attached to at least one of the outer surface of the rebar or the inner surface of the receiving member,
A method for connecting a reinforcing bar, wherein the reinforcing layer is broken while the reinforcing bar is inserted into the receiving member to harden the filler.
前記鉄筋を前記孔部に挿入することで、前記第１保護層および前記第２保護層および前記仕切層を破断させて前記主剤と前記硬化剤とを混合して硬化させる請求項６に記載の鉄筋の接続方法。 The filler has a main agent and a curing agent, and the main agent and the curing agent are layered while being separated by a partition layer, the main agent is covered with a first protective layer, and the curing agent is a second protective layer. Is coated with
7. The method according to claim 6, wherein the first reinforcing layer, the second protective layer, and the partition layer are broken by inserting the reinforcing bar into the hole, and the main agent and the curing agent are mixed and cured. How to connect the rebar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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|---|---|---|---|---|
| JPS58222249A (en) * | 1982-06-17 | 1983-12-23 | 積水ハウス株式会社 | Iron wire joint |
| JP2001271452A (en) * | 2000-03-24 | 2001-10-05 | Nippon Shokubai Co Ltd | Sheet reinforcing material and construction method |
| US20100031607A1 (en) * | 2008-08-11 | 2010-02-11 | Oliva Michael G | Splice System for Fiber-Reinforced Polymer Rebars |
| JP2015140539A (en) * | 2014-01-28 | 2015-08-03 | 株式会社コンステック | Joining structure and joining method |
| JP2016156163A (en) * | 2015-02-24 | 2016-09-01 | 株式会社熊谷組 | Filling-type joint for reinforcement |
| JP2018059387A (en) * | 2016-09-29 | 2018-04-12 | Ｊｆｅ条鋼株式会社 | Injection method of filler to screw reinforcement joint part and cartridge for accommodating filler |
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2018
- 2018-07-03 JP JP2018126926A patent/JP7137974B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58222249A (en) * | 1982-06-17 | 1983-12-23 | 積水ハウス株式会社 | Iron wire joint |
| JP2001271452A (en) * | 2000-03-24 | 2001-10-05 | Nippon Shokubai Co Ltd | Sheet reinforcing material and construction method |
| US20100031607A1 (en) * | 2008-08-11 | 2010-02-11 | Oliva Michael G | Splice System for Fiber-Reinforced Polymer Rebars |
| JP2015140539A (en) * | 2014-01-28 | 2015-08-03 | 株式会社コンステック | Joining structure and joining method |
| JP2016156163A (en) * | 2015-02-24 | 2016-09-01 | 株式会社熊谷組 | Filling-type joint for reinforcement |
| JP2018059387A (en) * | 2016-09-29 | 2018-04-12 | Ｊｆｅ条鋼株式会社 | Injection method of filler to screw reinforcement joint part and cartridge for accommodating filler |
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| JP7137974B2 (en) | 2022-09-15 |
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