JP6043479B2

JP6043479B2 - Deformed bar joint

Info

Publication number: JP6043479B2
Application number: JP2011269847A
Authority: JP
Inventors: 江尻紀夫
Original assignee: Tokyo Tekko Co Ltd; JFE Pipe Fitting Mfg Co Ltd
Current assignee: Tokyo Tekko Co Ltd; JFE Pipe Fitting Mfg Co Ltd
Priority date: 2011-01-05
Filing date: 2011-12-09
Publication date: 2016-12-14
Anticipated expiration: 2031-12-09
Also published as: JP2012154164A

Description

本発明は、異形鉄筋が所定の位置まで挿入されていることを容易に人の目で確認でき、かつ、グラウト材による鉄筋との強固な接続が可能な異形鉄筋用継手に関するものである。 The present invention relates to a joint for deformed reinforcing bars that can be easily confirmed by human eyes that deformed reinforcing bars have been inserted to a predetermined position and can be firmly connected to the reinforcing bars by a grout material.

特許文献１は、次に述べる異形鉄筋用継手を開示する。その異形鉄筋用継手は、鋳造により一体成形されている。その異形鉄筋用継手は、本体がその中央部分を厚肉にした筒状体とされている。その中央部分は多角形に成形されている。その中央部分には検査孔が設けられている。異形鉄筋用継手の本体内周部には螺旋状凹溝が形成されている。その螺旋状凹溝に、異形鉄筋の螺旋状突部を本体両端方向からねじ込むことが可能である。また本体両端部の外周に回転操作用工具の係合部が設けられている。 Patent document 1 discloses the joint for deformed reinforcing bars described below. The deformed reinforcing bar joint is integrally formed by casting. In the deformed reinforcing bar joint, the main body is a cylindrical body having a thick central portion. The central part is formed into a polygon. An inspection hole is provided in the central portion. A spiral groove is formed in the inner periphery of the main body of the deformed reinforcing bar joint. It is possible to screw the helical protrusion of the deformed reinforcing bar into the spiral groove from both ends of the main body. Engaging portions for the rotary operation tool are provided on the outer periphery of both ends of the main body.

特許文献１に開示された異形鉄筋用継手によれば、次に述べる効果を得ることができる。第１の効果は、容易に量産できるという効果である。第２の効果は、異形鉄筋が所定の位置まで挿入されていることを容易に目視できるという効果である。第３の効果は、不測の転がりを抑制できるという効果である。 According to the deformed reinforcing bar joint disclosed in Patent Document 1, the following effects can be obtained. The first effect is that it can be easily mass-produced. The second effect is an effect that it can be easily visually observed that the deformed reinforcing bar is inserted to a predetermined position. The third effect is that unexpected rolling can be suppressed.

特許文献２は、次に述べる継手構造を開示する。その継手構造は、異形又は丸鋼の鉄筋と、継手本体と、一対のロックボルトとによって構成される。継手本体は管状に形成される。継手本体は一直線状の管路を有する。この管路の開口両端に互いに左右逆向きの内ねじが設けられている。この継手本体の中央部分の外周は多角形に形成されている。スパナなど締め付け工具を回り止め状に掛けるためである。その多角形に形成されている中央部分には覗き孔兼用のグラウト材注入孔が形成されている。ロックボルトは、外ねじ（この外ねじは継手本体の内ねじにねじ込まれる）を設けた中空軸部と、多角形の大頭部（この大頭部は中空軸部の一端の外周に設けられる）とを有する。 Patent document 2 discloses the joint structure described below. The joint structure includes a deformed or round steel bar, a joint body, and a pair of lock bolts. The joint body is formed in a tubular shape. The joint body has a straight pipe line. Inner threads that are opposite to each other are provided at both ends of the opening of the pipe. The outer periphery of the central portion of the joint body is formed in a polygon. This is to hang a tightening tool such as a spanner in a non-rotating manner. A grout material injection hole also serving as a peephole is formed in the central portion formed in the polygon. The lock bolt includes a hollow shaft portion provided with an external screw (this external screw is screwed into the internal screw of the joint body) and a large polygonal head portion (this large head portion is provided on the outer periphery of one end of the hollow shaft portion). ).

特許文献２に開示された継手構造は、グラウト材注入孔から注入されたグラウト材が硬化することにより、継手本体に対するロックボルトの弛み止めを図ることができる。また、特許文献２に開示された継手構造は、鉄筋の端どうしの機械的結合状態を強固に維持できる。 The joint structure disclosed in Patent Document 2 can prevent the lock bolt from loosening with respect to the joint body by hardening the grout material injected from the grout material injection hole. Moreover, the joint structure disclosed in Patent Document 2 can firmly maintain the mechanical coupling state between the ends of the reinforcing bars.

実開昭６２− ７９０２４号公報Japanese Utility Model Publication No. 62-79024 特開平９ −２７９７６８号公報JP-A-9-279768

しかしながら、特許文献１に開示された異形鉄筋用継手と特許文献２に開示された継手構造とには、次に述べる２つの効果を両立することが難しいという問題点がある。第１の効果は、鉄筋が所定の位置まで挿入されていることを容易に目視できるという効果である。第２の効果は、グラウト材によって鉄筋と継手本体との機械的な接合状態を強固に維持するという効果である。鉄筋が所定の位置まで挿入されているか否かを容易に目視するためには、検査孔を大きくする必要がある。これに対し、グラウト材によって鉄筋と継手本体との機械的な接合状態を強固に維持するためには、グラウト材の漏出口となりそうな孔はなるべく小さいことが望ましい。グラウト材が漏れ出すことを防ぐためである。 However, the joint for deformed reinforcing bars disclosed in Patent Document 1 and the joint structure disclosed in Patent Document 2 have a problem that it is difficult to achieve both of the following two effects. The first effect is an effect that it can be easily visually observed that the reinforcing bar is inserted to a predetermined position. The second effect is that the mechanical joining state between the reinforcing bar and the joint body is firmly maintained by the grout material. In order to easily visually check whether or not the reinforcing bar is inserted to a predetermined position, it is necessary to enlarge the inspection hole. On the other hand, in order to firmly maintain the mechanical joining state between the reinforcing bar and the joint body by the grout material, it is desirable that the hole that is likely to be a leakage port for the grout material is as small as possible. This is to prevent the grout material from leaking out.

本発明の目的は、異形鉄筋が所定の位置まで挿入されていることを容易に人の目で確認でき、かつ、グラウト材による鉄筋との強固な接続が可能な異形鉄筋用継手を提供することにある。 An object of the present invention is to provide a deformed bar joint that can be easily confirmed by the human eye that the deformed reinforcing bar is inserted to a predetermined position and can be firmly connected to the reinforcing bar by a grout material. It is in.

上記目的を達成するために、本発明のある局面に従うと、異形鉄筋用継手２０，１２０は、一体かつ鋳鉄製の筒状体３０，１３０を備える。筒状体３０，１３０が、鉄筋進入部４０，４０，１４０，１４０と、孔付き筒部４２，１４２とを有している。鉄筋進入部４０，４０，１４０，１４０は、筒状体３０，１３０の両端に設けられている。鉄筋進入部４０，４０，１４０，１４０に異形鉄筋が進入する。孔付き筒部４２，１４２は、鉄筋進入部４０，４０，１４０，１４０の間に配置される。孔付き筒部４２，１４２には検査孔５２，１５２が設けられている。異形鉄筋用継手は、検査孔５２，１５２に嵌め込まれる透明部材３２，１３２をさらに備えている。また、透明部材３２，１３２は、透明な樹脂製の本体８０，１８０と、シール部８２，１８２と鍔部８４，１８４とを有する。この場合、本体８０，１８０は、検査孔５２，１５２に挿入される。シール部８２，１８２は、本体８０，１８０の外周に配置される。シール部８２，１８２は、検査孔５２，１５２の内周面と密着することにより、本体８０，１８０と検査孔５２，１５２の内周面との間を塞ぐ。鍔部８４，１８４は、筒状体３０，１３０と透明部材３２，１３２との隙間を塞ぐ。検査孔５２は、深ザグリ部６０と、曲面部６２とを有する。深ザグリ部６０は孔付き筒部４２の表面側開口の縁に設けられる。曲面部６２は、孔付き筒部４２の表面から見て深ザグリ部６０の奥に設けられる。曲面部６２は、孔付き筒部４２の表面から奥へ向かうにつれ次第に内径が小さくなっていく。シール部８２は、透明部材３２が検査孔５２に嵌め込まれるし検査孔５２のうち孔付き筒部４２の表面から見て曲面部６２より奥の位置に配置される。シール部８２は、本体８０と検査孔５２の内周面とに挟まれる。鍔部８４が、透明部材３２が検査孔５２に嵌め込まれると曲面部６２に密着する。 In order to achieve the above object, according to an aspect of the present invention, the deformed reinforcing bar joints 20 and 120 include cylindrical bodies 30 and 130 made of cast iron. The cylindrical bodies 30 and 130 have reinforcing bar entry portions 40, 40, 140, and 140 and holed cylinder portions 42 and 142. The reinforcing bar entry portions 40, 40, 140, 140 are provided at both ends of the cylindrical bodies 30, 130. The deformed reinforcing bar enters the reinforcing bar entry part 40, 40, 140, 140. The cylindrical portions 42 and 142 with holes are disposed between the reinforcing bar entry portions 40, 40, 140, and 140. Inspection holes 52 and 152 are provided in the cylindrical portions 42 and 142 with holes. The deformed reinforcing bar joint further includes transparent members 32 and 132 fitted into the inspection holes 52 and 152. Further, the transparent member 32, 132, that Yusuke a transparent resin body 80 or 180, and a sealing portion 82 and 182 and the flange portion 84, 184. In this case, the main bodies 80 and 180 are inserted into the inspection holes 52 and 152. The seal portions 82 and 182 are disposed on the outer periphery of the main bodies 80 and 180. The seal portions 82 and 182 are in close contact with the inner peripheral surfaces of the inspection holes 52 and 152, thereby closing the space between the main bodies 80 and 180 and the inner peripheral surfaces of the inspection holes 52 and 152. The flange portions 84 and 184 close the gap between the cylindrical bodies 30 and 130 and the transparent members 32 and 132. The inspection hole 52 has a deep counterbore portion 60 and a curved surface portion 62. The deep counterbore 60 is provided at the edge of the opening on the surface side of the holed cylinder 42. The curved surface portion 62 is provided at the back of the deep counterbore portion 60 when viewed from the surface of the holed cylinder portion 42. The curved surface portion 62 has an inner diameter that gradually decreases from the surface of the holed cylinder portion 42 toward the back. The seal portion 82 is disposed at a position behind the curved surface portion 62 when the transparent member 32 is fitted into the inspection hole 52 and viewed from the surface of the holed cylinder portion 42 in the inspection hole 52. The seal portion 82 is sandwiched between the main body 80 and the inner peripheral surface of the inspection hole 52. When the transparent member 32 is fitted into the inspection hole 52, the flange portion 84 comes into close contact with the curved surface portion 62.

上述した異形鉄筋用継手２０，１２０を用いれば、透明部材３２，１３２を介して検査孔５２，１５２の中を覗くことで、異形鉄筋が適切に捩じ込まれているか否かを容易に確認することができる。このため、異形鉄筋を接続しようとする者が熟練工でなくとも、異形鉄筋を容易に接続することができる。しかも、検査孔５２，１５２が透明部材３２，１３２によって塞がれている。このため、検査孔５２，１５２からグラウトが大量に漏れ出すことはない。グラウトが大量に漏れ出すことがないので、従来の異形鉄筋用継手と同様にグラウトを注入して異形鉄筋用継手２０，１２０と異形鉄筋とを接続することができる。その結果、異形鉄筋が所定の位置まで挿入されていることを容易に人の目で確認でき、かつ、グラウト材による鉄筋との強固な接続が可能な異形鉄筋用継手を提供できる。 If the above-described deformed bar joints 20 and 120 are used, it is easily confirmed whether or not the deformed bar is properly screwed by looking into the inspection holes 52 and 152 through the transparent members 32 and 132. can do. For this reason, even if the person who is going to connect a deformed reinforcing bar is not a skilled worker, it can connect a deformed reinforcing bar easily. Moreover, the inspection holes 52 and 152 are closed by the transparent members 32 and 132. For this reason, a large amount of grout does not leak from the inspection holes 52 and 152. Since a large amount of grouting does not leak, it is possible to connect the deformed reinforcing bar joints 20 and 120 and the deformed reinforcing bars by injecting the grout in the same manner as the conventional deformed reinforcing bar joints. As a result, it is possible to easily provide a deformed reinforcing bar inserted to a predetermined position with the human eye and provide a deformed reinforcing bar joint that can be firmly connected to the reinforcing bar by the grout material.

シール部８２，１８２が設けられていると、透明部材３２，１３２と検査孔５２，１５２の内周面との隙間がシール部８２，１８２によって塞がれることとなる。その隙間が塞がれることで、その隙間が塞がれていない場合に比べ、検査孔５２，１５２から漏れ出すグラウトの量を大幅に抑えることができる。 When the seal portions 82 and 182 are provided, the gap between the transparent members 32 and 132 and the inner peripheral surfaces of the inspection holes 52 and 152 is blocked by the seal portions 82 and 182. By closing the gap, the amount of grout leaking from the inspection holes 52 and 152 can be significantly reduced as compared to the case where the gap is not closed.

もしくは、上述したシール部８２，１８２が樹脂製であることが望ましい。 Alternatively, the above-described seal portions 82 and 182 are desirably made of resin.

シール部８２，１８２が樹脂製であると、透明部材３２，１８２と検査孔５２，１５２の内周面との隙間を塞ぐ際、シール部８２，１８２の一部が潰れることによりその隙間が塞がれる。これにより、検査孔５２，１５２の内周面の鋳肌にシール部８２，１８２が密着することとなる。その結果、検査孔５２，１５２からのグラウトの漏れをよく抑えることができる。 When the seal portions 82 and 182 are made of resin, when the gap between the transparent members 32 and 182 and the inner peripheral surfaces of the inspection holes 52 and 152 is closed, the seal portions 82 and 182 are partially crushed so that the gap is closed. Can be removed. As a result, the seal portions 82 and 182 are in close contact with the casting surface of the inner peripheral surface of the inspection holes 52 and 152. As a result, leakage of grout from the inspection holes 52 and 152 can be suppressed well.

また、上述した透明部材１３２が、抜落防止部１８８，１８８をさらに有していることが望ましい。この場合、抜落防止部１８８，１８８は、検査孔１５２からの透明部材１３２の抜落を防止する。 Moreover, it is desirable that the transparent member 132 described above further includes drop prevention portions 188 and 188. In this case, the drop prevention portions 188 and 188 prevent the transparent member 132 from dropping from the inspection hole 152.

透明部材１３２が抜落防止部１８８，１８８を有しているので、そうでない場合に比べ、透明部材１３２が検査孔１５２から脱落する可能性が低くなる。その脱落の可能性が低くなるので、建設現場などで異形鉄筋用継手１２０が使用されるまでに透明部材１３２が脱落したことが原因となって異形鉄筋用継手１２０が使用できなくなる可能性も低くなる。その結果、使用できない可能性が低い異形鉄筋用継手を提供できる。 Since the transparent member 132 has the drop prevention portions 188 and 188, the possibility that the transparent member 132 is dropped from the inspection hole 152 is lower than that when the transparent member 132 is not. Since the possibility of the dropout is reduced, the possibility that the deformed reinforcing bar joint 120 cannot be used due to the drop of the transparent member 132 before the use of the deformed bar joint 120 at the construction site or the like is also low. Become. As a result, it is possible to provide a deformed bar joint that is unlikely to be used.

また、上述した抜落防止部１８８，１８８が、係合部１８８の対を有することが望ましい。この場合、孔付き筒部１４２は、対向平面１６０の対と、引掛部１６４の対とを有する。係合部１８８は、互いに対向するよう配置される。係合部１８８は、孔付き筒部１４２のうち検査孔１５２を形成する箇所のいずれかに引掛かる。対向平面１６０は、検査孔１５２を形成している。対向平面１６０は、互いに対向するよう配置される。引掛部１６４は、孔付き筒部１４２の外側から見て対向平面１６０の奥にそれぞれ設けられる。引掛部１６４には、係合部１８８が引掛かる。 Further, it is desirable that the above-described drop prevention portions 188 and 188 have a pair of engaging portions 188. In this case, the holed cylinder part 142 has a pair of opposed flat surfaces 160 and a pair of hooking parts 164. The engaging portions 188 are arranged to face each other. The engaging portion 188 is hooked to any one of the hole-formed cylindrical portions 142 where the inspection hole 152 is formed. The opposing plane 160 forms an inspection hole 152. The opposing planes 160 are arranged to face each other. The hooking portions 164 are respectively provided in the back of the facing flat surface 160 when viewed from the outside of the holed cylindrical portion 142. The engaging portion 188 is hooked on the hook portion 164.

引掛部１６４の対には係合部１８８がそれぞれ引掛かる。引掛部１６４の対は、孔付き筒部１４２の外側から見て対向平面１６０の奥に設けられる。対向平面１６０は、検査孔１５２を形成している。対向平面１６０は、互いに対向するよう配置される。これにより、係合部１８８は対向平面１６０に沿う部分に配置されることとなる。係合部１８８が対向平面１６０に沿う部分に配置されると、例えば曲面に沿う位置に配置された場合に比べ、係合部１８８が引掛部１６４に引掛かり易くなる。係合部１８８が引掛部１６４に引掛かり易くなると、そうでない場合に比べ、透明部材１３２が検査孔１５２から脱落する可能性が低くなる。その結果、使用できない可能性がより低い異形鉄筋用継手を提供できる。 Engaging portions 188 are hooked on the pair of hook portions 164, respectively. The pair of hook portions 164 is provided at the back of the opposed plane 160 when viewed from the outside of the holed cylinder portion 142. The opposing plane 160 forms an inspection hole 152. The opposing planes 160 are arranged to face each other. As a result, the engaging portion 188 is disposed at a portion along the opposing plane 160. When the engaging portion 188 is disposed at a portion along the opposing flat surface 160, the engaging portion 188 is easily hooked on the hooking portion 164 as compared with a case where the engaging portion 188 is disposed at a position along the curved surface. If the engaging portion 188 is easily hooked to the hooking portion 164, the possibility that the transparent member 132 drops from the inspection hole 152 is reduced compared to the case where the engaging portion 188 is not easily hooked. As a result, it is possible to provide a deformed reinforcing bar joint that is less likely to be unusable.

もしくは、係合部１８８が凸部を有していることが望ましい。この場合、引掛部１６４が凹部１６４を有している。 Alternatively, it is desirable that the engaging portion 188 has a convex portion. In this case, the hooking portion 164 has a recess 164.

本発明によれば、異形鉄筋が所定の位置まで挿入されていることを容易に人の目で確認でき、かつ、グラウト材による鉄筋との強固な接続が可能な異形鉄筋用継手を提供できる。 ADVANTAGE OF THE INVENTION According to this invention, the joint for deformed rebars which can confirm easily that the deformed rebar is inserted to the predetermined position with the human eye, and can be firmly connected with the rebar by a grout material can be provided.

本発明の第１実施例にかかる異形鉄筋用継手を示す斜視図である。It is a perspective view which shows the coupling for deformed reinforcing bars concerning 1st Example of this invention. 本発明の第１実施例にかかる異形鉄筋用継手の中央部分付近についての軸方向の断面図である。It is sectional drawing of the axial direction about the center part vicinity of the joint for deformed reinforcing bars concerning 1st Example of this invention. 本発明の第１実施例にかかる透明部材の斜視図である。It is a perspective view of the transparent member concerning 1st Example of this invention. 本発明の第１実施例にかかる異形鉄筋用継手において透明部材が検査孔に嵌め込まれている状況を示す検査孔付近の断面図である。It is sectional drawing of inspection hole vicinity which shows the condition where the transparent member is engage | inserted in the inspection hole in the joint for deformed reinforcing bars concerning 1st Example of this invention. 本発明の第２実施例にかかる異形鉄筋用継手を示す斜視図である。It is a perspective view which shows the coupling for deformed reinforcing bars concerning 2nd Example of this invention. 本発明の第２実施例にかかる異形鉄筋用継手の孔付き筒部のうち検査孔付近の斜視図である。It is a perspective view near an inspection hole among cylindrical parts with a hole of a joint for deformed reinforcing bars concerning the 2nd example of the present invention. 本発明の第２実施例にかかる透明部材の斜視図である。It is a perspective view of the transparent member concerning 2nd Example of this invention. 図６のＡ−Ａ断面図である。It is AA sectional drawing of FIG.

以下、図面を参照しつつ、本発明の実施例について説明する。以下の説明では、同一の部品には同一の符号を付してある。それらの名称および機能も同一である。したがって、それらについての詳細な説明は繰返さない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

＜第１実施例＞
［異形鉄筋用継手の構成］
図１は、本実施例にかかる異形鉄筋用継手２０の斜視図である。図１を参照しつつ、本実施例にかかる異形鉄筋用継手２０の構成について説明する。 <First embodiment>
[Structure of deformed bar joint]
FIG. 1 is a perspective view of a deformed reinforcing bar joint 20 according to the present embodiment. The configuration of the deformed reinforcing bar joint 20 according to the present embodiment will be described with reference to FIG.

本実施例にかかる異形鉄筋用継手２０は、「ねじふし鉄筋」と呼ばれる異形鉄筋に接続される。「ねじふし鉄筋」は「ねじ鉄筋」とも呼ばれる。これは、鉄筋のうち外周の突部が螺旋を形成しているもののことである。以下の説明では、この螺旋を形成している突部のことを「螺旋状突部」と称する。また、以下の説明では、特に説明がない場合、「異形鉄筋」とはねじふし鉄筋を意味する。 The deformed reinforcing bar joint 20 according to the present embodiment is connected to a deformed reinforcing bar called “screw-reinforcing bar”. “Screw rebar” is also called “screw rebar”. This is what the outer peripheral protrusion forms a spiral among the reinforcing bars. In the following description, the protrusions forming the spiral are referred to as “spiral protrusions”. Moreover, in the following description, unless otherwise specified, “deformed bar” means a threaded reinforcing bar.

本実施例にかかる異形鉄筋用継手２０は、筒状体３０と、透明部材３２とを備える。筒状体３０は、鋳造により一体成形された鋳鉄製の筒状体である。透明部材３２は、筒状体３０の検査孔５２に嵌め込まれる。検査孔５２については後述する。 The deformed reinforcing bar joint 20 according to the present embodiment includes a cylindrical body 30 and a transparent member 32. The cylindrical body 30 is a cylindrical body made of cast iron that is integrally formed by casting. The transparent member 32 is fitted into the inspection hole 52 of the cylindrical body 30. The inspection hole 52 will be described later.

［筒状体の構成］
筒状体３０は、鉄筋進入部４０，４０と、孔付き筒部４２とを有する。鉄筋進入部４０，４０の形状は六角錐の先端部分を切り取ったような形状である。孔付き筒部４２の外周の断面形状は六角柱状である。孔付き筒部４２は鉄筋進入部４０，４０に比べて太い。筒状体３０には鉄筋捩込孔５０が設けられている。鉄筋捩込孔５０は鉄筋進入部４０，４０と孔付き筒部４２とを貫通する。鉄筋捩込孔５０の内径は異形鉄筋用継手２０に接続されるべき図示しない異形鉄筋の外径より若干大きい。 [Configuration of cylindrical body]
The tubular body 30 includes reinforcing bar entry portions 40 and 40 and a tubular portion 42 with a hole. The shape of the reinforcing bar entry portions 40, 40 is such that the tip of the hexagonal pyramid is cut off. The cross-sectional shape of the outer periphery of the holed cylinder portion 42 is a hexagonal column shape. The holed cylinder part 42 is thicker than the reinforcing bar entry parts 40, 40. The cylindrical body 30 is provided with a reinforcing bar screw hole 50. The reinforcing bar screw hole 50 penetrates the reinforcing bar entry parts 40 and 40 and the holed cylinder part 42. The inner diameter of the reinforcing bar screw hole 50 is slightly larger than the outer diameter of the deformed reinforcing bar (not shown) to be connected to the deformed reinforcing bar joint 20.

鉄筋捩込孔５０の内周には、螺旋状凹溝７０が形成されている。螺旋状凹溝７０は、異形鉄筋の外周に設けられた螺旋状突部とかみ合う。この螺旋状凹溝７０は、その螺旋方向が筒状体３０の一端から他端にかけて連続するようにしても良い。この螺旋状凹溝７０は、筒状体３０の中央位置を境として逆方向（いわゆる逆ねじタイプ）となるようなものでもよい。螺旋状凹溝７０の形状は、異形鉄筋の螺旋状突部と密にかみ合うものである必要はない。むしろ、螺旋状凹溝７０の形状は、異形鉄筋の螺旋状突部とある程度の遊びをもってかみ合うものであることが望ましい。その第１の理由は筒状体３０を鋳造するための中子の製作を容易にするためである。第２の理由は螺旋状凹溝７０自体の強度向上を図るためである。 A spiral groove 70 is formed on the inner periphery of the reinforcing bar screw hole 50. The spiral groove 70 meshes with a spiral protrusion provided on the outer periphery of the deformed reinforcing bar. The spiral groove 70 may have a spiral direction continuous from one end to the other end of the cylindrical body 30. The spiral groove 70 may be in a reverse direction (so-called reverse screw type) with the central position of the cylindrical body 30 as a boundary. The shape of the spiral groove 70 need not be closely meshed with the helical protrusion of the deformed reinforcing bar. Rather, it is desirable that the shape of the spiral groove 70 engages with the helical protrusion of the deformed reinforcing bar with a certain amount of play. The first reason is to facilitate the manufacture of a core for casting the cylindrical body 30. The second reason is to improve the strength of the spiral groove 70 itself.

なお、筒状体３０の肉厚は、異形鉄筋に作用することが予想される最大引張り力に対して充分に耐え得る厚みとする。特に孔付き筒部４２の厚みは検査孔５２を設けたことによる強度低下を補い得る厚さとする。 In addition, the thickness of the cylindrical body 30 is set to a thickness that can sufficiently withstand the maximum tensile force that is expected to act on the deformed reinforcing bar. In particular, the thickness of the cylindrical portion 42 with a hole is set to a thickness that can compensate for a decrease in strength caused by providing the inspection hole 52.

［検査孔の構造］
図２は、孔付き筒部４２付近についての軸方向の断面図である。図２を参照しつつ、孔付き筒部４２に設けられている検査孔５２について説明する。図１から明らかなように、孔付き筒部４２には検査孔５２が設けられている。上述したように、検査孔５２には透明部材３２が嵌め込まれている。本実施例にかかる異形鉄筋用継手２０を用いて異形鉄筋を接続しようとする作業者は、透明部材３２を介してこの検査孔５２の中を覗くことにより、異形鉄筋が正しく接続されているか否かを検査する。検査孔５２は、孔付き筒部４２の表面から鉄筋捩込孔５０まで貫通している。 [Inspection hole structure]
FIG. 2 is a cross-sectional view in the axial direction around the cylindrical portion 42 with a hole. With reference to FIG. 2, the inspection hole 52 provided in the holed cylinder portion 42 will be described. As is apparent from FIG. 1, the holed cylinder portion 42 is provided with an inspection hole 52. As described above, the transparent member 32 is fitted in the inspection hole 52. An operator who intends to connect a deformed reinforcing bar using the deformed reinforcing bar joint 20 according to the present embodiment looks into the inspection hole 52 through the transparent member 32 to determine whether the deformed reinforcing bar is correctly connected. Inspect. The inspection hole 52 penetrates from the surface of the holed cylinder part 42 to the reinforcing bar screw hole 50.

検査孔５２は、深ザグリ部６０と、曲面部６２とを有する。深ザグリ部６０は孔付き筒部４２の表面側開口の縁に設けられる。曲面部６２は、孔付き筒部４２の表面から見て深ザグリ部６０の奥に設けられる。図２から明らかなように、曲面部６２は、検査孔５２のうち、孔付き筒部４２の表面から奥へ向かうにつれ次第に内径が小さくなっていく部分である。 The inspection hole 52 has a deep counterbore portion 60 and a curved surface portion 62. The deep counterbore 60 is provided at the edge of the opening on the surface side of the holed cylinder 42. The curved surface portion 62 is provided at the back of the deep counterbore portion 60 when viewed from the surface of the holed cylinder portion 42. As apparent from FIG. 2, the curved surface portion 62 is a portion of the inspection hole 52 whose inner diameter gradually decreases from the surface of the holed cylinder portion 42 toward the back.

［透明部材の構成］
図３は、透明部材３２の斜視図である。図３を参照しつつ、透明部材３２について説明する。本実施例にかかる透明部材３２は、本体８０と、シール部８２と、鍔部８４と、隔離壁部８６とを有する。本実施例にかかる透明部材３２は、筒状体３０の素材である鋳鉄より柔らかな樹脂を素材としている。本実施例にかかる透明部材３２の場合、本体８０と、シール部８２と、鍔部８４と、隔離壁部８６とは一体である。本体８０は検査孔５２に挿入される筒状の部分である。シール部８２は本体８０の外周に配置される。シール部８２は、検査孔５２の内周面に密着することにより、本体８０と検査孔５２の内周面との間を塞ぐ。なお、シール部８２のうち筒状体３０の内部側（図３における下側）にテーパ面１００が設けられている。鍔部８４は、本体８０の端に設けられる。鍔部８４は検査孔５２の縁に接触する。これにより筒状体３０と透明部材３２との隙間が塞がれる。そのため、鍔部８４はシール部８２と共に検査孔５２からグラウトが漏れることを防ぐこととなる。隔離壁部８６は、本体８０の内部に設けられる。隔離壁部８６は筒状体３０の中と外とを隔離する。隔離壁部８６にはグラウト注入孔９０が設けられている。図示しないグラウト注入ノズルはこのグラウト注入孔９０に挿入される。 [Configuration of transparent member]
FIG. 3 is a perspective view of the transparent member 32. The transparent member 32 will be described with reference to FIG. The transparent member 32 according to the present embodiment includes a main body 80, a seal portion 82, a flange portion 84, and an isolation wall portion 86. The transparent member 32 according to the present embodiment is made of a resin softer than cast iron that is a material of the cylindrical body 30. In the case of the transparent member 32 according to the present embodiment, the main body 80, the seal portion 82, the flange portion 84, and the isolation wall portion 86 are integral. The main body 80 is a cylindrical portion that is inserted into the inspection hole 52. The seal portion 82 is disposed on the outer periphery of the main body 80. The seal portion 82 closes the space between the main body 80 and the inner peripheral surface of the inspection hole 52 by being in close contact with the inner peripheral surface of the inspection hole 52. Note that a tapered surface 100 is provided on the inner side (lower side in FIG. 3) of the cylindrical body 30 in the seal portion 82. The collar portion 84 is provided at the end of the main body 80. The flange 84 contacts the edge of the inspection hole 52. As a result, the gap between the cylindrical body 30 and the transparent member 32 is closed. Therefore, the flange portion 84 prevents the grout from leaking from the inspection hole 52 together with the seal portion 82. The isolation wall portion 86 is provided inside the main body 80. The isolation wall part 86 isolates the inside of the cylindrical body 30 from the outside. The isolation wall portion 86 is provided with a grout injection hole 90. A grout injection nozzle (not shown) is inserted into the grout injection hole 90.

［検査孔のシール状況］
図４は透明部材３２が検査孔５２に嵌め込まれている状況を示す検査孔５２付近の断面図である。図４を参照しつつ、透明部材３２と検査孔５２の内周面との間がどのように塞がれているかということについて具体的に説明する。上述したように、透明部材３２が検査孔５２に嵌め込まれている。透明部材３２のシール部８２は、検査孔５２のうち孔付き筒部４２の表面から見て曲面部６２より奥の位置に配置される。この位置において、シール部８２は、本体８０と検査孔５２の内周面とに挟まれている。このため、本体８０と検査孔５２の内周面との隙間にグラウトが入っても、そのグラウトは孔付き筒部４２の外へ漏れない。さらに、透明部材３２の鍔部８４は、検査孔５２の曲面部６２に密着している。このため、シール部８２だけではグラウトの漏れが防げなかったとしても、そのグラウトが孔付き筒部４２の外へ漏れることを防ぐことができる。しかも、シール部８２と検査孔５２の内周面との間に生じる摩擦力により、シール部８２がない場合に比べ、鍔部８４は曲面部６２から離れがたくなっている。その分、グラウトが孔付き筒部４２の外へ漏れることを防ぐことができる。 [Inspection hole seal status]
FIG. 4 is a cross-sectional view of the vicinity of the inspection hole 52 showing a state in which the transparent member 32 is fitted in the inspection hole 52. With reference to FIG. 4, how the gap between the transparent member 32 and the inner peripheral surface of the inspection hole 52 is blocked will be specifically described. As described above, the transparent member 32 is fitted in the inspection hole 52. The seal portion 82 of the transparent member 32 is disposed at a position behind the curved surface portion 62 when viewed from the surface of the holed cylinder portion 42 in the inspection hole 52. At this position, the seal portion 82 is sandwiched between the main body 80 and the inner peripheral surface of the inspection hole 52. For this reason, even if a grout enters the gap between the main body 80 and the inner peripheral surface of the inspection hole 52, the grout does not leak out of the cylindrical portion 42 with a hole. Further, the flange portion 84 of the transparent member 32 is in close contact with the curved surface portion 62 of the inspection hole 52. For this reason, even if the seal part 82 alone cannot prevent leakage of the grout, it is possible to prevent the grout from leaking out of the holed cylinder part 42. Moreover, the flange portion 84 is less likely to be separated from the curved surface portion 62 than the case where there is no seal portion 82 due to the frictional force generated between the seal portion 82 and the inner peripheral surface of the inspection hole 52. Accordingly, it is possible to prevent the grout from leaking out of the holed cylinder portion 42.

［異形鉄筋の接続手順］
次に、上述した異形鉄筋用継手２０を用いて２本の異形鉄筋を接続させる手順を説明する。 [Procedure for connecting deformed bars]
Next, a procedure for connecting two deformed reinforcing bars using the deformed reinforcing bar joint 20 will be described.

まず、接続しようとずる各異形鉄筋の端部を筒状体３０に捻じ込ませてゆく。この際、筒状体３０の鉄筋進入部４０，４０をスパナなどの図示しない工具で掴む。これにより異形鉄筋を効率よく捩じ込むことができる。 First, the ends of the deformed reinforcing bars to be connected are screwed into the cylindrical body 30. At this time, the reinforcing bar entry portions 40, 40 of the cylindrical body 30 are gripped with a tool (not shown) such as a spanner. Thereby, the deformed reinforcing bar can be screwed in efficiently.

このとき、作業者は、透明部材３２を介して検査孔５２の中を覗く。異形鉄筋が適切に捩じ込まれている場合、両異形鉄筋の端部が筒状体３０の中央部位で軽く接触している。作業者は、検査孔５２を介してその状況を見ることができる。このため、作業者が熟練工でなくとも、筒状体３０内部に両異形鉄筋を適切に捩じ込むことができる。 At this time, the operator looks into the inspection hole 52 through the transparent member 32. When the deformed reinforcing bars are properly screwed in, the ends of both deformed reinforcing bars are in light contact with each other at the central portion of the cylindrical body 30. The operator can see the situation through the inspection hole 52. For this reason, even if an operator is not a skilled worker, both deformed reinforcing bars can be appropriately screwed into the cylindrical body 30.

両異形鉄筋の捩じ込みが完了したら、図示しないグラウト注入ノズルを透明部材３２のグラウト注入孔９０に挿入する。挿入が完了したら、筒状体３０の内部にグラウトを注入する。筒状体３０両端の鉄筋捩込孔５０の開口からグラウトが漏れ出したら、異形鉄筋の接続作業は終了である。 When the screwing of both deformed reinforcing bars is completed, a grout injection nozzle (not shown) is inserted into the grout injection hole 90 of the transparent member 32. When the insertion is completed, grout is injected into the cylindrical body 30. When the grout leaks from the opening of the reinforcing bar screw hole 50 at both ends of the cylindrical body 30, the connection work of the deformed reinforcing bar is completed.

［本実施例にかかる効果の説明］
以上のようにして、本実施例にかかる異形鉄筋用継手２０を用いれば、作業者が熟練工でなくとも、筒状体３０内部に異形鉄筋を適切に捩じ込むことができる。しかも、グラウトの漏れを最小限に抑えることができる。その結果、異形鉄筋が所定の位置まで挿入されていることを容易に人の目で確認でき、かつ、グラウト材による鉄筋との強固な接続が可能な異形鉄筋用継手を提供できる。 [Explanation of effects according to this embodiment]
As described above, if the deformed reinforcing bar joint 20 according to the present embodiment is used, the deformed reinforcing bar can be appropriately screwed into the cylindrical body 30 even if the operator is not a skilled worker. Moreover, grout leakage can be minimized. As a result, it is possible to easily provide a deformed reinforcing bar inserted to a predetermined position with the human eye and provide a deformed reinforcing bar joint that can be firmly connected to the reinforcing bar by the grout material.

また、本実施例の場合、透明部材３２と検査孔５２の内周面との隙間がシール部８２によって塞がれているので、その隙間が塞がれていない場合に比べ、検査孔５２から漏れ出すグラウトの量を大幅に抑えることができる。 In the case of the present embodiment, the gap between the transparent member 32 and the inner peripheral surface of the inspection hole 52 is closed by the seal portion 82, so that the gap from the inspection hole 52 is smaller than that in the case where the gap is not closed. The amount of grout that leaks out can be greatly reduced.

また、本実施例の場合、シール部８２が樹脂製なので、透明部材３２と検査孔５２の内周面との隙間を塞ぐ際、シール部８２の一部が潰れる。シール部８２の一部が潰れるので、検査孔５２の内周面の鋳肌にシール部８２が密着する。その結果、検査孔５２からのグラウトの漏れをよく抑えることができる。 In the case of the present embodiment, since the seal portion 82 is made of resin, when the gap between the transparent member 32 and the inner peripheral surface of the inspection hole 52 is closed, a part of the seal portion 82 is crushed. Since a part of the seal portion 82 is crushed, the seal portion 82 comes into close contact with the casting surface of the inner peripheral surface of the inspection hole 52. As a result, leakage of grout from the inspection hole 52 can be well suppressed.

また、本実施例の場合、透明部材３２が鍔部８４を有する。このため、検査孔５２からのグラウトの漏れを抑えることができる。 In the case of the present embodiment, the transparent member 32 has a flange portion 84. For this reason, leakage of grout from the inspection hole 52 can be suppressed.

＜第２実施例＞
［異形鉄筋用継手の構成］
図５は、本実施例にかかる異形鉄筋用継手１２０の斜視図である。図５を参照しつつ、本実施例にかかる異形鉄筋用継手１２０の構成について説明する。 <Second embodiment>
[Structure of deformed bar joint]
FIG. 5 is a perspective view of the deformed reinforcing bar joint 120 according to the present embodiment. The configuration of the deformed reinforcing bar joint 120 according to the present embodiment will be described with reference to FIG.

本実施例にかかる異形鉄筋用継手１２０は異形鉄筋に接続される。 The joint 120 for deformed reinforcing bars according to the present embodiment is connected to the deformed reinforcing bars.

本実施例にかかる異形鉄筋用継手１２０は、筒状体１３０と、透明部材１３２とを備える。筒状体１３０は鋳造により一体成形される。筒状体１３０は鋳鉄製である。透明部材１３２は、筒状体１３０の検査孔１５２に嵌め込まれる。検査孔１５２については後述する。 The deformed reinforcing bar joint 120 according to the present embodiment includes a cylindrical body 130 and a transparent member 132. The cylindrical body 130 is integrally formed by casting. The cylindrical body 130 is made of cast iron. The transparent member 132 is fitted into the inspection hole 152 of the cylindrical body 130. The inspection hole 152 will be described later.

［筒状体の構成］
筒状体１３０は、鉄筋進入部１４０，１４０と、孔付き筒部１４２とを有する。鉄筋進入部１４０，１４０の形状は円柱状である。孔付き筒部１４２の外周の断面形状は角柱状（角柱の辺にあたる箇所には面取りが施されている）である。孔付き筒部１４２は鉄筋進入部１４０，１４０に比べて太い。筒状体１３０には鉄筋捩込孔１５０が設けられている。鉄筋捩込孔１５０は鉄筋進入部１４０，１４０と孔付き筒部１４２とを貫通する。鉄筋捩込孔１５０の内径は異形鉄筋用継手１２０に接続されるべき図示しない異形鉄筋の外径より若干大きい。 [Configuration of cylindrical body]
The tubular body 130 has reinforcing bar entry portions 140 and 140 and a tubular portion 142 with a hole. The shape of the reinforcing bar entry portions 140 and 140 is a columnar shape. The cross-sectional shape of the outer periphery of the cylindrical portion 142 with a hole is a prismatic shape (a portion corresponding to the side of the prism is chamfered). The cylindrical portion 142 with a hole is thicker than the reinforcing bar entry portions 140 and 140. The cylindrical body 130 is provided with a reinforcing bar screw hole 150. The reinforcing bar screw hole 150 passes through the reinforcing bar entry parts 140 and 140 and the holed cylinder part 142. The inner diameter of the reinforcing bar screw hole 150 is slightly larger than the outer diameter of the deformed reinforcing bar (not shown) to be connected to the deformed reinforcing bar joint 120.

鉄筋捩込孔１５０の内周には、螺旋状凹溝１７０が形成されている。螺旋状凹溝１７０は、異形鉄筋の外周に設けられた螺旋状突部とかみ合う。この螺旋状凹溝１７０は、その螺旋方向が筒状体１３０の一端から他端にかけて連続するようにしても良い。この螺旋状凹溝１７０は、筒状体１３０の中央位置を境として逆方向（いわゆる逆ねじタイプ）となるようなものでもよい。螺旋状凹溝１７０の形状は、異形鉄筋の螺旋状突部と密にかみ合うものである必要はない。むしろ、螺旋状凹溝１７０の形状は、異形鉄筋の螺旋状突部とある程度の遊びをもってかみ合うものであることが望ましい。その第１の理由は筒状体１３０を鋳造するための中子の製作を容易にするためである。第２の理由は螺旋状凹溝１７０自体の強度向上を図るためである。 A spiral groove 170 is formed on the inner periphery of the reinforcing bar screw hole 150. The spiral groove 170 engages with a spiral protrusion provided on the outer periphery of the deformed reinforcing bar. The spiral groove 170 may have a spiral direction continuous from one end to the other end of the cylindrical body 130. The spiral groove 170 may be in a reverse direction (so-called reverse screw type) with the central position of the cylindrical body 130 as a boundary. The shape of the spiral groove 170 does not need to be closely meshed with the spiral protrusion of the deformed reinforcing bar. Rather, it is desirable that the shape of the spiral groove 170 engages with the helical protrusion of the deformed reinforcing bar with a certain amount of play. The first reason is to facilitate the manufacture of a core for casting the cylindrical body 130. The second reason is to improve the strength of the spiral groove 170 itself.

なお、筒状体１３０の肉厚は、異形鉄筋に作用することが予想される最大引張り力に対して充分に耐え得る厚みとする。特に孔付き筒部１４２の厚みは検査孔１５２を設けたことによる強度低下を補い得る厚さとする。 The thickness of the cylindrical body 130 is set to a thickness that can sufficiently withstand the maximum tensile force expected to act on the deformed reinforcing bar. In particular, the thickness of the cylindrical portion 142 with a hole is set to a thickness that can compensate for the strength reduction due to the provision of the inspection hole 152.

［検査孔の構造］
図６は、孔付き筒部１４２のうち検査孔１５２付近の斜視図である。図６を参照しつつ、孔付き筒部１４２に設けられている検査孔１５２について説明する。図５および図６から明らかなように、孔付き筒部１４２には検査孔１５２が設けられている。上述したように、検査孔１５２には透明部材１３２が嵌め込まれている（図６は透明部材１３２が取外された状況での検査孔１５２付近を示す）。本実施例にかかる異形鉄筋用継手１２０を用いて異形鉄筋を接続しようとする作業者は、透明部材１３２を介してこの検査孔１５２の中を覗くことにより、異形鉄筋が正しく接続されているか否かを検査する。検査孔１５２は、孔付き筒部１４２の表面から鉄筋捩込孔１５０まで貫通している。 [Inspection hole structure]
FIG. 6 is a perspective view of the vicinity of the inspection hole 152 in the cylindrical portion 142 with a hole. With reference to FIG. 6, the inspection hole 152 provided in the holed cylinder portion 142 will be described. As apparent from FIGS. 5 and 6, the holed cylinder portion 142 is provided with an inspection hole 152. As described above, the transparent member 132 is fitted into the inspection hole 152 (FIG. 6 shows the vicinity of the inspection hole 152 in a state where the transparent member 132 is removed). An operator who intends to connect the deformed reinforcing bar using the deformed reinforcing bar joint 120 according to the present embodiment looks through the inspection hole 152 through the transparent member 132 to check whether the deformed reinforcing bar is correctly connected. Inspect. The inspection hole 152 penetrates from the surface of the holed cylinder part 142 to the reinforcing bar screw hole 150.

本実施例の場合、検査孔１５２は、一対の対向平面１６０と、一対の対向曲面１６２と、一対の凹部１６４とによって形成される。対向平面１６０は、互いに対向するよう配置される。対向曲面１６２も、互いに対向するよう配置される。図６に示すように、凹部１６４は、孔付き筒部１４２の外側から見て対向平面１６０の奥にそれぞれ設けられる。本実施例の場合、凹部１６４が引掛部（後述する係合部１８８が引掛かる部分）として機能する。 In the case of the present embodiment, the inspection hole 152 is formed by a pair of opposed flat surfaces 160, a pair of opposed curved surfaces 162, and a pair of concave portions 164. The opposing planes 160 are arranged to face each other. The opposing curved surfaces 162 are also arranged to face each other. As shown in FIG. 6, the recesses 164 are respectively provided in the back of the opposed plane 160 when viewed from the outside of the holed cylinder portion 142. In the case of the present embodiment, the concave portion 164 functions as a hooking portion (a portion where an engaging portion 188 described later is hooked).

［透明部材の構成］
図７は、透明部材１３２の斜視図である。図７において、透明部材１３２はその一部が破断された状態で示されている。図７を参照しつつ、透明部材１３２について説明する。本実施例にかかる透明部材１３２は、本体１８０と、シール部１８２と、鍔部１８４と、隔離壁部１８６と、一対の係合部１８８とを有する。本実施例にかかる透明部材１３２は、筒状体１３０の素材である鋳鉄より柔らかな樹脂を素材としている。本実施例にかかる透明部材１３２の場合、本体１８０と、シール部１８２と、鍔部１８４と、隔離壁部１８６と、係合部１８８とは一体である。本体１８０は検査孔１５２に挿入される筒状の部分である。シール部１８２は本体１８０の外周に配置される。シール部１８２は、検査孔１５２の内周面に密着することにより、本体１８０と検査孔１５２の内周面との間を塞ぐ。なお、シール部１８２のうち筒状体３０の内部側（図７における下側）にテーパ面２００が設けられている。鍔部１８４は、本体１８０の端に設けられる。鍔部１８４は検査孔１５２の縁に接触する。これにより筒状体１３０と透明部材１３２との隙間が塞がれる。そのため、鍔部１８４はシール部１８２と共に検査孔１５２からグラウトが漏れることを防ぐこととなる。隔離壁部１８６は、本体１８０の内部に設けられる。隔離壁部１８６は筒状体１３０の中と外とを隔離する。係合部１８８は凹部１６４に引掛かる。 [Configuration of transparent member]
FIG. 7 is a perspective view of the transparent member 132. In FIG. 7, the transparent member 132 is shown in a partially broken state. The transparent member 132 will be described with reference to FIG. The transparent member 132 according to the present embodiment includes a main body 180, a seal portion 182, a flange portion 184, an isolation wall portion 186, and a pair of engaging portions 188. The transparent member 132 according to the present embodiment is made of a resin softer than the cast iron that is the material of the cylindrical body 130. In the case of the transparent member 132 according to the present embodiment, the main body 180, the seal portion 182, the flange portion 184, the isolation wall portion 186, and the engaging portion 188 are integral. The main body 180 is a cylindrical portion that is inserted into the inspection hole 152. The seal portion 182 is disposed on the outer periphery of the main body 180. The seal portion 182 closes the space between the main body 180 and the inner peripheral surface of the inspection hole 152 by being in close contact with the inner peripheral surface of the inspection hole 152. A tapered surface 200 is provided on the inner side (lower side in FIG. 7) of the cylindrical body 30 in the seal portion 182. The collar portion 184 is provided at the end of the main body 180. The flange 184 contacts the edge of the inspection hole 152. As a result, the gap between the cylindrical body 130 and the transparent member 132 is closed. Therefore, the flange part 184 prevents the grout from leaking from the inspection hole 152 together with the seal part 182. The isolation wall 186 is provided inside the main body 180. The isolation wall 186 isolates the inside and outside of the cylindrical body 130. The engaging portion 188 is hooked on the recess 164.

図７から明らかなように、係合部１８８の対は互いに対向する位置に設けられている。本実施例の場合、係合部１８８の対が検査孔１５２からの抜落を防止する抜落防止部として機能している。係合部１８８は、片持梁部１９６と、凸部１９８とを有している。片持梁部１９６は本体１８０の一部（より具体的に述べるとシール部１８２の真下）から突出している。片持梁部１９６は凸部１９８を検査孔１５２の内周面（より具体的には凹部１６４の内周面）に押付ける。また片持梁部１９６は凸部１９８が検査孔１５２から受ける反力を支える。凸部１９８は凹部１６４内に嵌まる。 As is clear from FIG. 7, the pair of engaging portions 188 are provided at positions facing each other. In the case of the present embodiment, the pair of engaging portions 188 functions as a drop-out preventing portion that prevents drop-out from the inspection hole 152. The engaging part 188 has a cantilever part 196 and a convex part 198. The cantilever beam portion 196 protrudes from a part of the main body 180 (more specifically, just below the seal portion 182). The cantilever portion 196 presses the convex portion 198 against the inner peripheral surface of the inspection hole 152 (more specifically, the inner peripheral surface of the concave portion 164). The cantilever portion 196 supports the reaction force that the convex portion 198 receives from the inspection hole 152. The convex part 198 fits in the concave part 164.

隔離壁部１８６にはグラウト注入孔１９０が設けられている。図示しないグラウト注入ノズルはこのグラウト注入孔１９０に挿入される。 A grout injection hole 190 is provided in the isolation wall portion 186. A grout injection nozzle (not shown) is inserted into the grout injection hole 190.

［検査孔のシール状況］
図８は図６のＡ−Ａ断面図である。図８を参照しつつ、透明部材１３２と検査孔１５２の内周面との間がどのように塞がれているかということについて具体的に説明する。上述したように、透明部材１３２が検査孔１５２に嵌め込まれている。透明部材１３２のシール部１８２は、本体１８０と検査孔１５２の内周面とに挟まれている。このため、本体１８０と検査孔１５２の内周面との隙間にグラウトが入っても、そのグラウトは孔付き筒部１４２の外へ漏れない。さらに、透明部材１３２の鍔部１８４は、検査孔１５２の縁に密着している。このため、シール部１８２だけではグラウトの漏れが防げなかったとしても、そのグラウトが孔付き筒部１４２の外へ漏れることを防ぐことができる。しかも、シール部１８２と検査孔１５２の内周面との間に生じる摩擦力により、シール部１８２がない場合に比べ、鍔部１８４は検査孔１５２の縁から離れがたくなっている。その分、グラウトが孔付き筒部１４２の外へ漏れることを防ぐことができる。その際、凸部１９８が凹部１６４内に嵌まっているので、グラウトの圧力によって透明部材１３２が検査孔１５２から押し出されることも防止できる。 [Inspection hole seal status]
8 is a cross-sectional view taken along the line AA in FIG. With reference to FIG. 8, how the gap between the transparent member 132 and the inner peripheral surface of the inspection hole 152 is blocked will be specifically described. As described above, the transparent member 132 is fitted in the inspection hole 152. The seal portion 182 of the transparent member 132 is sandwiched between the main body 180 and the inner peripheral surface of the inspection hole 152. For this reason, even if a grout enters the gap between the main body 180 and the inner peripheral surface of the inspection hole 152, the grout does not leak out of the cylindrical portion 142 with a hole. Further, the flange portion 184 of the transparent member 132 is in close contact with the edge of the inspection hole 152. For this reason, even if the seal part 182 alone cannot prevent leakage of the grout, it is possible to prevent the grout from leaking out of the holed cylinder part 142. In addition, the flange portion 184 is difficult to separate from the edge of the inspection hole 152 due to the frictional force generated between the seal portion 182 and the inner peripheral surface of the inspection hole 152 compared to the case where there is no seal portion 182. Accordingly, it is possible to prevent the grout from leaking out of the cylindrical portion 142 with a hole. At this time, since the convex portion 198 is fitted in the concave portion 164, the transparent member 132 can be prevented from being pushed out of the inspection hole 152 by the pressure of the grout.

［異形鉄筋の接続手順］
次に、上述した異形鉄筋用継手１２０を用いて２本の異形鉄筋を接続させる手順を説明する。 [Procedure for connecting deformed bars]
Next, a procedure for connecting two deformed reinforcing bars using the above-described deformed reinforcing bar joint 120 will be described.

まず、接続しようとずる各異形鉄筋の端部を筒状体１３０に捻じ込ませてゆく。この際、筒状体１３０の鉄筋進入部１４０，１４０をスパナなどの図示しない工具で掴む。これにより異形鉄筋を効率よく捩じ込むことができる。 First, the ends of the deformed reinforcing bars to be connected are screwed into the cylindrical body 130. At this time, the reinforcing bar entry portions 140 and 140 of the cylindrical body 130 are gripped with a tool (not shown) such as a spanner. Thereby, the deformed reinforcing bar can be screwed in efficiently.

このとき、作業者は、透明部材１３２を介して検査孔１５２の中を覗く。異形鉄筋が適切に捩じ込まれている場合、両異形鉄筋の端部が筒状体１３０の中央部位で軽く接触している。作業者は、検査孔１５２を介してその状況を見ることができる。このため、作業者が熟練工でなくとも、筒状体１３０内部に両異形鉄筋を適切に捩じ込むことができる。 At this time, the operator looks into the inspection hole 152 through the transparent member 132. When the deformed reinforcing bars are properly screwed in, the ends of both deformed reinforcing bars are in light contact with each other at the central portion of the tubular body 130. The operator can see the situation through the inspection hole 152. For this reason, even if an operator is not a skilled worker, both deformed reinforcing bars can be appropriately screwed into the cylindrical body 130.

両異形鉄筋の捩じ込みが完了したら、図示しないグラウト注入ノズルを透明部材１３２のグラウト注入孔１９０に挿入する。挿入が完了したら、筒状体１３０の内部にグラウトを注入する。筒状体１３０両端の鉄筋捩込孔１５０の開口からグラウトが漏れ出したら、異形鉄筋の接続作業は終了である。 When the screwing of both deformed reinforcing bars is completed, a grout injection nozzle (not shown) is inserted into the grout injection hole 190 of the transparent member 132. When the insertion is completed, grout is injected into the cylindrical body 130. When the grout leaks from the opening of the reinforcing bar screw hole 150 at both ends of the cylindrical body 130, the connection work of the deformed reinforcing bar is completed.

［本実施例にかかる効果の説明］
以上のようにして、本実施例にかかる異形鉄筋用継手１２０を用いれば、作業者が熟練工でなくとも、筒状体１３０内部に異形鉄筋を適切に捩じ込むことができる。しかも、グラウトの漏れを最小限に抑えることができる。その結果、異形鉄筋が所定の位置まで挿入されていることを容易に人の目で確認でき、かつ、グラウト材による鉄筋との強固な接続が可能な異形鉄筋用継手を提供できる。 [Explanation of effects according to this embodiment]
As described above, if the deformed reinforcing bar joint 120 according to the present embodiment is used, the deformed reinforcing bar can be appropriately screwed into the tubular body 130 even if the operator is not a skilled worker. Moreover, grout leakage can be minimized. As a result, it is possible to easily provide a deformed reinforcing bar inserted to a predetermined position with the human eye and provide a deformed reinforcing bar joint that can be firmly connected to the reinforcing bar by the grout material.

また、本実施例の場合、透明部材１３２が抜落防止部として係合部１８８の対を有している。係合部１８８の対を有しているので、そうでない場合に比べ、透明部材１３２が検査孔１５２から脱落する可能性が低くなる。その脱落の可能性が低くなるので、建設現場などで異形鉄筋用継手１２０が使用されるまでに透明部材１３２が脱落したことが原因となって異形鉄筋用継手１２０が使用できなくなる可能性も低くなる。その結果、使用できない可能性が低い異形鉄筋用継手を提供できる。 In the case of the present embodiment, the transparent member 132 has a pair of engaging portions 188 as a drop-off preventing portion. Since it has the pair of engaging parts 188, compared with the case where it is not so, possibility that the transparent member 132 will fall out from the test | inspection hole 152 becomes low. Since the possibility of the dropout is reduced, the possibility that the deformed reinforcing bar joint 120 cannot be used due to the drop of the transparent member 132 before the use of the deformed bar joint 120 at the construction site or the like is also low. Become. As a result, it is possible to provide a deformed bar joint that is unlikely to be used.

また、本実施例の場合、孔付き筒部１４２が、対向平面１６０の対と、凹部１６４の対（すなわち引掛部の対）とを有する。凹部１６４の対には係合部１８８がそれぞれ引掛かる。凹部１６４の対は、孔付き筒部１４２の外側から見て対向平面１６０の奥に設けられる。対向平面１６０は、互いに対向するよう配置される。これにより、係合部１８８は対向平面１６０に沿う部分に配置されることとなる。係合部１８８が対向平面１６０に沿う部分に配置されると、例えば曲面に沿う位置に配置された場合に比べ、係合部１８８が凹部１６４に引掛かり易くなる。係合部１８８が凹部１６４に引掛かり易くなると、そうでない場合に比べ、透明部材１３２が検査孔１５２から脱落する可能性が低くなる。その結果、使用できない可能性がより低い異形鉄筋用継手を提供できる。 In the case of the present embodiment, the cylindrical portion 142 with a hole has a pair of opposed flat surfaces 160 and a pair of concave portions 164 (that is, a pair of hooking portions). Engaging portions 188 are hooked on the pair of concave portions 164, respectively. The pair of recesses 164 is provided in the back of the opposed plane 160 when viewed from the outside of the holed cylinder portion 142. The opposing planes 160 are arranged to face each other. As a result, the engaging portion 188 is disposed at a portion along the opposing plane 160. When the engaging portion 188 is disposed at a portion along the opposing plane 160, the engaging portion 188 is easily caught by the concave portion 164 as compared with a case where the engaging portion 188 is disposed at a position along the curved surface, for example. If the engaging portion 188 is easily caught by the concave portion 164, the possibility that the transparent member 132 is dropped from the inspection hole 152 is reduced compared to the case where the engaging portion 188 is not easily caught. As a result, it is possible to provide a deformed reinforcing bar joint that is less likely to be unusable.

また、本実施例の場合、透明部材１３２が、透明な樹脂製の本体１８０と、シール部１８２とを有する。本体１８０は、検査孔１５２に挿入される。シール部１８２は、本体１８０の外周に配置される。シール部１８２は、検査孔１５２の内周面と密着する。透明部材１３２と検査孔１５２の内周面との隙間がシール部１８２によって塞がれているので、その隙間が塞がれていない場合に比べ、検査孔１５２から漏れ出すグラウトの量を大幅に抑えることができる。 In the present embodiment, the transparent member 132 includes a transparent resin main body 180 and a seal portion 182. The main body 180 is inserted into the inspection hole 152. The seal portion 182 is disposed on the outer periphery of the main body 180. The seal portion 182 is in close contact with the inner peripheral surface of the inspection hole 152. Since the gap between the transparent member 132 and the inner peripheral surface of the inspection hole 152 is closed by the seal portion 182, the amount of grout leaking from the inspection hole 152 is significantly larger than when the gap is not closed. Can be suppressed.

また、本実施例の場合、シール部１８２が樹脂製である。シール部１８２が樹脂製であると、透明部材１３２と検査孔１５２の内周面との隙間を塞ぐ際、シール部１８２の一部が潰れる。シール部１８２の一部が潰れるので、検査孔１５２の内周面の鋳肌にシール部１８２が密着する。その結果、検査孔１５２からのグラウトの漏れをよく抑えることができる。 In the present embodiment, the seal portion 182 is made of resin. When the seal part 182 is made of resin, a part of the seal part 182 is crushed when the gap between the transparent member 132 and the inner peripheral surface of the inspection hole 152 is closed. Since a part of the seal part 182 is crushed, the seal part 182 adheres to the casting surface of the inner peripheral surface of the inspection hole 152. As a result, leakage of grout from the inspection hole 152 can be suppressed well.

また、本実施例の場合、透明部材１３２が鍔部１８４を有する。この鍔部１８４は、筒状体１３０と透明部材１３２との隙間を塞ぐ。このため、検査孔１５２からのグラウトの漏れを抑えることができる。 In the case of the present embodiment, the transparent member 132 has the flange portion 184. The flange portion 184 closes the gap between the cylindrical body 130 and the transparent member 132. For this reason, leakage of grout from the inspection hole 152 can be suppressed.

［変形例］
なお、今回開示された実施例はすべての点で例示である。本発明の範囲は上述した実施例に基づいて制限されるものではなく、本発明の趣旨を逸脱しない範囲で種々の設計変更をしてもよいのはもちろんである。 [Modification]
In addition, the Example disclosed this time is an illustration in all the points. The scope of the present invention is not limited based on the above-described embodiments, and it is needless to say that various design changes may be made without departing from the spirit of the present invention.

例えば、筒状体３０の外形は上述したものに限定されない。筒状体３０の断面形状が上述したものとは異なる多角形であってもよいし、円形であってもよい。 For example, the outer shape of the cylindrical body 30 is not limited to that described above. The cross-sectional shape of the cylindrical body 30 may be a polygon different from that described above, or may be a circle.

また、透明部材３２は一体である必要はない。また、透明部材３２と検査孔５２の内周面との隙間を塞ぐことができるのであれば、シール部８２の素材は特に限定されない。言うまでもないことであるが、透明部材３２の素材となる樹脂としてアクリル樹脂その他任意の樹脂が選択され得る。 Further, the transparent member 32 need not be integral. Further, the material of the seal portion 82 is not particularly limited as long as the gap between the transparent member 32 and the inner peripheral surface of the inspection hole 52 can be closed. Needless to say, an acrylic resin or any other resin can be selected as the resin that is the material of the transparent member 32.

また、異形鉄筋用継手は、ねじふし鉄筋以外の異形鉄筋を接続できるものであってもよい。すなわち、鉄筋捩込孔５０の内周の螺旋状凹溝７０は本発明において必要不可欠なものとは言えない。これは異形鉄筋用継手が接続の対象とする異形鉄筋の種類によっては必要になるものに過ぎない。 Further, the deformed reinforcing bar joint may be capable of connecting deformed reinforcing bars other than the threaded reinforcing bar. That is, the spiral groove 70 on the inner periphery of the reinforcing bar screw hole 50 is not essential in the present invention. This is only necessary depending on the type of deformed bar to which the deformed bar joint is to be connected.

また、係合部１８８は凸部１９８を有するものに限定されない。引掛部は凹部１６４から構成されるものに限定されない。例えば、係合部１８８が凹部から構成され引掛部が凸部から構成されてもよい。このような場合の具体例として、係合部が貫通孔が設けられている部分を有し引掛部がその貫通孔を貫通する突起を有するというものがある。さらに、係合部１８８が引掛かる箇所は凹部１６４に限定されない。その箇所の例には、孔付き筒部１４２のうち検査孔１５２を形成する箇所のいずれかがある。 Further, the engaging portion 188 is not limited to the one having the convex portion 198. The hooking portion is not limited to the one constituted by the concave portion 164. For example, the engaging part 188 may be constituted by a concave part and the hooking part may be constituted by a convex part. As a specific example in such a case, there is one in which the engaging portion has a portion in which a through hole is provided and the hooking portion has a protrusion penetrating the through hole. Furthermore, the location where the engaging portion 188 is hooked is not limited to the recess 164. Examples of the location include any of the locations where the inspection hole 152 is formed in the cylindrical portion 142 with a hole.

２０，１２０…異形鉄筋用継手
３０，１３０…筒状体
３２，１３２…透明部材
４０，１４０…鉄筋進入部
４２，１４２…孔付き筒部
５０，１５０…鉄筋捩込孔
５２，１５２…検査孔
６０…深ザグリ部
６２…曲面部
７０，１７０…螺旋状凹溝
８０，１８０…本体
８２，１８２…シール部
８４，１８４…鍔部
８６，１８６…隔離壁部
９０，１９０…グラウト注入孔
１００，２００…テーパ面
１６０…対向平面
１６２…対向曲面
１６４…凹部
１８８…係合部
１９６…片持梁部
１９８…凸部 20, 120 ... Joints for deformed reinforcing bars 30, 130 ... Cylindrical bodies 32, 132 ... Transparent members 40, 140 ... Reinforcing bar entry parts 42, 142 ... Cylindrical parts 50, 150 ... Reinforcing bar screw holes 52, 152 ... Inspection holes 60 ... Deep counterbore part 62 ... Curved surface part 70, 170 ... Spiral concave groove 80, 180 ... Main body 82, 182 ... Seal part 84, 184 ... Gutter part 86, 186 ... Isolation wall part 90, 190 ... Grout injection hole 100, 200 ... tapered surface 160 ... opposing flat surface 162 ... opposing curved surface 164 ... concave portion 188 ... engaging portion 196 ... cantilever portion 198 ... convex portion

Claims

It has an integral and cast iron cylindrical body,
The cylindrical body is
Reinforcing bar entry part, provided at both ends of the tubular body, into which a deformed reinforcing bar enters,
It is a joint for deformed reinforcing bars that is arranged between the reinforcing bar entry parts and has a holed cylinder part in which an inspection hole is provided,
The deformed reinforcing bar joint further includes a transparent member fitted in the inspection hole,
The transparent member is
A transparent resin body inserted into the inspection hole;
A seal portion that is disposed on the outer periphery of the main body and closes between the inner peripheral surface of the inspection hole by closely contacting the inner peripheral surface of the inspection hole;
It has a flange that closes the gap between the cylindrical body and the transparent member ,
The inspection hole is
A deep counterbore part provided at the edge of the surface side opening of the cylindrical part with holes,
A curved surface portion that is provided at the back of the deep counterbore portion as viewed from the surface of the holed cylinder part, and has an inner diameter that gradually decreases from the surface of the holed cylinder part toward the back,
When the transparent member is fitted into the inspection hole, the seal portion is disposed at a position deeper than the curved surface portion when viewed from the surface of the holed cylinder portion of the inspection hole, and the main body and the inspection hole Between the inner peripheral surface of
The deformed reinforcing bar joint, wherein the flange portion is in close contact with the curved surface portion when the transparent member is fitted into the inspection hole .

The joint for deformed reinforcing bars according to claim 1, wherein the seal portion is made of resin.

2. The deformed reinforcing bar joint according to claim 1, wherein the transparent member further includes a drop prevention portion that prevents the drop from the inspection hole.

The drop-off prevention part has a pair of engaging parts arranged to face each other;
The engaging portion is hooked to any of the holes to form the inspection hole,
The cylindrical portion with holes is
A pair of opposing planes forming the inspection hole and arranged to face each other;
4. The deformed reinforcing bar according to claim 3 , further comprising a pair of hook portions that are provided at a depth of the opposed plane when viewed from the outside of the cylindrical portion with holes and on which the engaging portions are hooked. Fittings.

The engaging portion has a convex portion;
The deformed reinforcing bar joint according to claim 4 , wherein the hook portion has a recess.