JP6680559B2

JP6680559B2 - Reinforcement jig for joint and mounting method of reinforcement jig

Info

Publication number: JP6680559B2
Application number: JP2016028150A
Authority: JP
Inventors: 信夫宗友; 光信矢野; 忍安井; 充弘森; 酒井　大介; 大介酒井
Original assignee: Taisei Kiko Co Ltd; Okayama City Office
Current assignee: Taisei Kiko Co Ltd; Okayama City Office
Priority date: 2016-02-17
Filing date: 2016-02-17
Publication date: 2020-04-15
Anticipated expiration: 2036-02-17
Also published as: JP2017145885A

Description

本発明は、両筒状部材の端部から径外方向に突出したフランジ部どうしの接合部を補強する補強治具、および補強治具の装着方法に関する。 The present invention relates to a reinforcing jig that reinforces a joint portion between flange portions that project radially outward from ends of both tubular members, and a method for mounting the reinforcing jig .

上記補強治具として、例えば特許文献１には、一対のフランジ接合部に各別に当接する押圧部を備えた一対の挟持部材と、両挟持部材を接合部の接合方向に引き寄せて固定する締結機構とを備えた構成が開示されている。 As the above-mentioned reinforcing jig, for example, in Patent Document 1, a pair of holding members each having a pressing portion that abuts a pair of flange joint portions, and a fastening mechanism that pulls and fixes both the holding members in the joint direction of the joint portions. A configuration including and is disclosed.

また、一方の挟持部材には、両フランジ部を連結する連結ボルトの頭部又はナットに対して、内側から径外方向に向かって当接するＣ字状の脱落防止腕が形成されている。この脱落防止腕によって、補強治具が両フランジ部から脱落するのが防止される。 In addition, a C-shaped drop-preventing arm that abuts against the head or nut of the connecting bolt that connects both flange portions from the inside toward the outside in the radial direction is formed on one of the holding members. The fall prevention arm prevents the reinforcing jig from dropping from both flange portions.

特開２０１４−１４１９９５号公報JP, 2014-141995, A

例えば、地上に露出した水管橋等のフランジ接合部を補強治具で補強する場合、特許文献１のように脱落防止腕を設けた構成であれば、自重或いは地震等により、フランジ接合部に歪みや変形或いは相対的なずれ等が生じたとしても、補強治具の落下を防止することができる。 For example, when a flange joint portion of a water pipe bridge exposed on the ground is reinforced with a reinforcing jig, the flange joint portion may be distorted by its own weight, an earthquake, or the like if the cap is provided with a fall prevention arm as in Patent Document 1. Even if deformation, relative displacement, or the like occurs, the reinforcing jig can be prevented from falling.

一方、フランジ部どうしの接合部を補強する際、両フランジ部を連結する連結ボルトを締結工具で締増して、所望の締付トルクを満足させる必要がある。このとき、脱落防止腕が邪魔になって、締付工具が挿入し難く、連結ボルトの締付作業に手間がかかってしまうので、改善の余地がある。 On the other hand, when the joint portion between the flange portions is reinforced, it is necessary to tighten the connecting bolt that connects both flange portions with a fastening tool to satisfy a desired tightening torque. At this time, the fall-off preventing arm interferes with the insertion of the tightening tool, and the work of tightening the connecting bolt takes time, so there is room for improvement.

そこで、脱落を防止しつつ所望の締付トルクを得るための作業が容易である接合部の補強治具や補強治具の装着方法が望まれている。 Therefore, there is a demand for a reinforcing jig for the joint portion and a method for mounting the reinforcing jig, which facilitates the work for obtaining the desired tightening torque while preventing the falling off.

接合部の補強治具の特徴構成は、第一筒状部材の端部から径外方向に突出した第一フランジ部と第二筒状部材の端部から径外方向に突出した第二フランジ部とを連結ボルトで接合した接合部に装着され、前記連結ボルトの頭部又はナットが配置される前記第一フランジ部の接合方向における外側面を押圧する第一押圧部と、前記第二フランジ部の外側面を押圧する第二押圧部と、前記第一押圧部と前記第二押圧部とを、前記接合方向に近接させて固定する締結機構と、前記第一押圧部の基部から延出し、前記頭部又はナットに対して内側から前記径外方向に向かって当接する脱落防止腕と、を備え、前記脱落防止腕は、前記頭部又はナットに対して前記接合方向に引退するよう、少なくとも前記頭部又はナットに当接する縁部の厚みが他の部位よりも小さく設定され、前記縁部には、少なくとも前記頭部又はナットの周りに、前記第一フランジ部に向かって段落ちした段差部が形成されていている点にある。また、補強治具の装着方法の特徴は、第一筒状部材の端部から径外方向に突出した第一フランジ部と第二筒状部材の端部から径外方向に突出した第二フランジ部とを連結ボルトで接合した接合部に補強治具を装着する補強治具の装着方法であって、前記補強治具は、前記連結ボルトの頭部又はナットが配置される前記第一フランジ部の接合方向における外側面を押圧する第一押圧部と、前記第二フランジ部の外側面を押圧する第二押圧部と、前記第一押圧部と前記第二押圧部とを、前記接合方向に近接させて固定する締結機構と、前記第一押圧部の基部から延出し、前記頭部又はナットに対して内側から前記径外方向に向かって当接する脱落防止腕と、を備え、前記脱落防止腕は、前記頭部又はナットに対して前記接合方向に引退するよう、少なくとも前記頭部又はナットに当接する縁部の厚みが他の部位よりも小さく設定されており、前記装着方法は、前記脱落防止腕を前記頭部又はナットに当接させた状態で、前記締結機構を締付操作する第一締結工程と、前記連結ボルト又は前記ナットを締付操作する第二締結工程と、含み、前記第一締結工程と前記第二締結工程とを交互に実行する点にある。 The characteristic structure of the reinforcing jig for the joining portion is that the first flange portion that projects radially outward from the end portion of the first tubular member and the second flange portion that projects radially outward from the end portion of the second tubular member. And a second pressing portion, which is attached to a joining portion joined with a joining bolt, and which pushes an outer surface in a joining direction of the first flange portion where the head or nut of the joining bolt is arranged. A second pressing portion that presses the outer surface of the first pressing portion and the second pressing portion, a fastening mechanism that fixes the second pressing portion in proximity to the joining direction, and extends from the base of the first pressing portion, A fall prevention arm that contacts the head or the nut from the inside toward the radial direction, and the fall prevention arm retreats in the joining direction with respect to the head or the nut. The thickness of the edge that abuts the head or nut is other It is set smaller than the edge, at least around the head or nut, in that the step portion and Chi paragraph toward the first flange portion is formed. The feature of the method of mounting the reinforcing jig is that the first flange portion that projects radially outward from the end portion of the first cylindrical member and the second flange portion that projects radially outward from the end portion of the second cylindrical member. A method of mounting a reinforcing jig to a joint portion in which a connecting portion is joined with a connecting bolt, wherein the reinforcing jig is the first flange portion in which a head or a nut of the connecting bolt is arranged. A first pressing portion that presses the outer surface in the joining direction, a second pressing portion that presses the outer surface of the second flange portion, the first pressing portion and the second pressing portion, in the joining direction. The locking mechanism includes a fastening mechanism that is fixed close to each other, and a fall prevention arm that extends from the base portion of the first pressing portion and comes into contact with the head or the nut from the inside toward the radial outer direction. The arm retreats in the joining direction with respect to the head or the nut, Even if the thickness of the edge portion that comes into contact with the head or the nut is set to be smaller than that of other portions, the mounting method is in a state where the fall prevention arm is brought into contact with the head or the nut. A point of performing the first fastening step and the second fastening step alternately, including a first fastening step of fastening the fastening mechanism and a second fastening step of fastening the connecting bolt or the nut. It is in.

本構成では、補強治具をフランジ接合部に固定する際、締結機構を締付けると、第一フランジ部と第二フランジ部とが締結機構の締付力によって互いに近接方向に移動する。その結果、連結ボルトをさらに締付けることが可能となり、フランジ接合部に対する締付トルクを増加させることができる。これら締結機構と連結ボルトとの締付けを交互に行うことで、所望の締付けトルクを得るものである。 In this configuration, when the fastening mechanism is tightened when the reinforcing jig is fixed to the flange joint portion, the first flange portion and the second flange portion move toward each other due to the fastening force of the fastening mechanism. As a result, the connecting bolt can be further tightened, and the tightening torque for the flange joint can be increased. By alternately tightening the fastening mechanism and the connecting bolt, a desired tightening torque is obtained.

また、本構成では、第一フランジ部と第二フランジ部とを接合する連結ボルトの頭部又はナット（以下、「ナット等」と言う。）に対して内側から径外方向に向かって当接する脱落防止腕を設けている。このため、自重或いは地震等により、フランジ接合部に歪みや変形或いは相対的なずれ等が生じた場合でも、脱落防止腕がナット等に確実に当接するので、補強治具がフランジ接合部から脱落するのを防止することができる。 Further, in the present configuration, the head portion or the nut (hereinafter, referred to as “nut or the like”) of the connecting bolt that joins the first flange portion and the second flange portion is contacted from the inside in the radial direction. A fall prevention arm is provided. Therefore, even if the flange joint is distorted, deformed, or relatively misaligned due to its own weight or an earthquake, the fall prevention arm securely contacts the nut, etc., so the reinforcing jig does not fall off the flange joint. Can be prevented.

さらに、本構成では、脱落防止腕がナット等に対してフランジ接合方向に引退するよう、脱落防止腕における少なくともナット等に当接する縁部の厚みを小さく設定している。つまり、ナット等の周りは、脱落防止腕の高さがナット等の高さより小さく設定されている。このため、ナット等の締付けを行う際、ナット等の周囲に締付工具を確実に挿入することができる。よって、脱落を防止しつつ所望の締付トルクを得るための作業が容易である接合部の補強治具を提供できた。 Further, in this configuration, the thickness of at least the edge portion of the drop-preventing arm that abuts the nut or the like is set to be small so that the drop-preventing arm retracts in the flange joining direction with respect to the nut or the like. That is, the height of the fall prevention arm is set smaller than the height of the nut or the like around the nut or the like. Therefore, when tightening the nut or the like, the tightening tool can be reliably inserted around the nut or the like. Therefore, it is possible to provide a reinforcing jig for a joint portion, which facilitates the work for obtaining a desired tightening torque while preventing the falling torque.

本構成のように、脱落防止腕の縁部に段差部を形成すれば、ナット等の側面と段差部の側壁との間に凹状の隙間が形成されるので、ラチェット等の締付工具が挿入し易く、締付工具の先端部をナット等に引っ掛け易い。 If a step is formed at the edge of the fall prevention arm as in this configuration, a concave gap is formed between the side surface of the nut and the side wall of the step, so a tightening tool such as a ratchet can be inserted. And the tip of the tightening tool is easily hooked on a nut or the like.

他の特徴構成は、前記段差部には、前記第一フランジ部に向かうに連れて傾斜したテーパ面が形成されている点にある。 Another characteristic configuration is that a taper surface that is inclined toward the first flange portion is formed in the step portion.

本構成では、締付工具の装着を容易にしつつ締付工具をテーパ面で案内することが可能となるので、所望の締付トルクを得るための作業が極めて容易である。 With this configuration, it is possible to guide the tightening tool with the tapered surface while facilitating mounting of the tightening tool, and therefore the work for obtaining the desired tightening torque is extremely easy.

他の特徴構成は、前記脱落防止腕は、前記基部から先端部に向かうに連れて厚みが小さく設定されている点にある。 Another characteristic configuration is that the fall prevention arm is set to have a thickness that decreases from the base portion toward the tip portion.

本構成では、脱落防止腕の先端部の厚みを小さくして、ナット等の締付作業の円滑化を図りつつ、脱落防止腕の支持部に十分な厚みを確保して剛性を高めることができる。しかも、基部から先端部に向けて厚みを漸減させれば良いので、加工が容易である。 With this configuration, the thickness of the distal end portion of the cap can be reduced to facilitate the tightening work of the nuts and the like, while ensuring a sufficient thickness for the support portion of the cap to increase rigidity. . Moreover, since the thickness may be gradually reduced from the base portion toward the tip portion, the processing is easy.

接合部の補強構造の特徴構成は、第一筒状部材の端部から径外方向に突出した第一フランジ部と第二筒状部材の端部から径外方向に突出した第二フランジ部とを連結ボルトで接合した接合部に装着された補強治具が、前記連結ボルトの頭部又はナットが配置される前記第一フランジ部の接合方向における外側面を押圧する第一押圧部と、前記第二フランジ部の外側面を押圧する第二押圧部と、前記第一押圧部と前記第二押圧部とを、前記接合方向に近接させて固定する締結機構と、前記第一押圧部の基部から延出し、前記頭部又はナットに対して内側から前記径外方向に向かって当接する脱落防止腕と、を備え、前記頭部又はナットが前記脱落防止腕よりも嵩高くなるよう、前記頭部又はナットと前記第一フランジ部の外側面との間に高さ調整部材が挿入されている点にある。 The characteristic structure of the reinforcing structure of the joint portion is that the first flange portion that projects radially outward from the end of the first tubular member and the second flange portion that projects radially outward from the end of the second tubular member. Reinforcing jig attached to a joint portion joined by a connecting bolt, a first pressing portion for pressing an outer surface in the joining direction of the first flange portion where the head or nut of the connecting bolt is arranged, A second pressing portion that presses the outer side surface of the second flange portion, a fastening mechanism that fixes the first pressing portion and the second pressing portion in proximity to each other in the joining direction, and a base portion of the first pressing portion. And a fall-prevention arm that extends from the inside and comes into contact with the head or the nut from the inside toward the radial outward direction, and the head or the nut is bulkier than the fall-prevention arm. Between the nut or nut and the outer surface of the first flange portion. Lies in member is inserted.

本構成の補強治具は、第一フランジ部と第二フランジ部とを接合するナット等に対して内側から径外方向に向かって当接する脱落防止腕を設けている。このため、自重或いは地震等により、フランジ接合部に歪みや変形或いは相対的なずれ等が生じた場合でも、脱落防止腕がナット等に確実に当接するので、補強治具がフランジ接合部から脱落するのを防止することができる。 The reinforcing jig of this configuration is provided with a fall prevention arm that comes into contact with the nut or the like that joins the first flange portion and the second flange portion from the inside toward the outside in the radial direction. Therefore, even if the flange joint is distorted, deformed, or relatively misaligned due to its own weight or an earthquake, the fall prevention arm securely contacts the nut, etc., so the reinforcing jig does not fall off the flange joint. Can be prevented.

さらに、本構成では、ナット等が脱落防止腕より嵩高くなるよう、ナット等と第一フランジ部の外側面との間に高さ調整部材が挿入されている。つまり、ナット等の周囲は、脱落防止腕の高さがナット等の高さより小さく設定されている。このため、ナット等の締付けを行う際、ナット等の周りに締付工具を確実に挿入することができる。よって、脱落を防止しつつ所望の締付トルクを得るための作業が容易である接合部の補強構造を提供できた。 Furthermore, in the present configuration, the height adjusting member is inserted between the nut and the like and the outer surface of the first flange portion so that the nut and the like are more bulky than the fall-off preventing arm. That is, the height of the fall prevention arm is set smaller than the height of the nut and the like around the nut and the like. Therefore, when tightening the nut or the like, the tightening tool can be reliably inserted around the nut or the like. Therefore, it is possible to provide the reinforcing structure of the joint portion, in which the work for obtaining the desired tightening torque is easy while preventing the falling off.

両筒状部材の分解斜視図である。It is an exploded perspective view of both cylindrical members. 両筒状部材の平面図である。It is a top view of both cylindrical members. 両筒状部材の縦断面図である。It is a longitudinal cross-sectional view of both tubular members. 第一実施形態に係る第一挟持部材の概略構成を示す図である。It is a figure which shows schematic structure of the 1st clamping member which concerns on 1st embodiment. 第一実施形態に係る第二挟持部材の概略構成を示す図である。It is a figure which shows schematic structure of the 2nd clamping member which concerns on 1st embodiment. 第一実施形態に係る補強治具の装着状態を示す斜視図である。It is a perspective view which shows the mounting state of the reinforcement jig which concerns on 1st embodiment. 第一実施形態に係る補強治具の装着状態を示す平面図である。It is a top view which shows the mounting state of the reinforcing jig which concerns on 1st embodiment. 第一実施形態に係る補強治具の装着状態を示す側面図である。It is a side view which shows the mounting state of the reinforcing jig which concerns on 1st embodiment. 第一実施形態に係る補強治具の装着状態を示す断面図である。It is sectional drawing which shows the mounting state of the reinforcement jig which concerns on 1st embodiment. 第一実施形態に係る補強治具の平面図である。It is a top view of the reinforcement jig concerning a first embodiment. 第一実施形態に係る補強治具の正面図である。It is a front view of the reinforcement jig concerning a first embodiment. 第一実施形態に係る補強治具の右側面図である。It is a right side view of the reinforcing jig which concerns on 1st embodiment. 第一実施形態に係る補強治具の背面図である。It is a rear view of the reinforcing jig which concerns on 1st embodiment. 第一実施形態に係る補強治具の左側面図である。It is a left side view of the reinforcement jig concerning a first embodiment. 第一実施形態に係る補強治具の底面図である。It is a bottom view of the reinforcement jig concerning a first embodiment. 第一実施形態の第一変形例を示す拡大図である。It is an enlarged view which shows the 1st modification of 1st embodiment. 第一実施形態の第二変形例を示す拡大図である。It is an enlarged view which shows the 2nd modification of 1st embodiment. 第一実施形態の第三変形例を示す拡大図である。It is an enlarged view which shows the 3rd modification of 1st embodiment. 第一実施形態の第四変形例を示す拡大図である。It is an enlarged view showing the 4th modification of a first embodiment. 第二実施形態に係る補強治具の装着状態を示す拡大平面図である。It is an enlarged plan view showing a mounting state of a reinforcing jig according to a second embodiment. 第二実施形態に係る補強治具の装着状態を示す拡大側面図である。It is an expanded side view which shows the mounting state of the reinforcement jig which concerns on 2nd embodiment. 別実施形態１に係る補強治具の装着状態を示す斜視図である。It is a perspective view which shows the mounting state of the reinforcement jig which concerns on another embodiment 1. 別実施形態１に係る補強治具の装着状態を示す縦断面図である。It is a longitudinal cross-sectional view showing a mounted state of a reinforcing jig according to another embodiment 1. 別実施形態２に係る補強治具の装着状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the mounting state of the reinforcing jig which concerns on another Embodiment 2.

以下に、本発明に係る接合部の補強治具Ｐの実施形態について、図面に基づいて説明する。本実施形態では、補強治具Ｐの一例として、水道管１，１（第一筒状部材，第二筒状部材の一例）の端部から径外方向に突出した両フランジ部１Ａ，１Ｂ（第一フランジ部，第二フランジ部の一例）の接合部を補強する場合について説明する。ただし、以下の実施形態に限定されることなく、その要旨を逸脱しない範囲内で種々の変形が可能である。 Hereinafter, an embodiment of a reinforcing jig P for a joint portion according to the present invention will be described with reference to the drawings. In the present embodiment, as an example of the reinforcing jig P, both flange portions 1A and 1B (radially outwardly protruding from the ends of the water pipes 1 and 1 (an example of the first tubular member and the second tubular member) ( A case of reinforcing the joint portion of the first flange portion and the second flange portion) will be described. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit of the invention.

図１〜図３は流体配管系（管路）の途中のフランジ接合部が示される。流体管の一例である鋳鉄製の両水道管１，１の端部から、夫々径外方向に円板状に突出形成された両フランジ部１Ａ，１Ｂが、複数の連結ボルト４Ａ及びナット４Ｂ（本実施形態では、８箇所ずつ）により連結されている。本実施形態では、ナット４Ｂが位置する側を第一フランジ部１Ａ、連結ボルト４Ａの頭部４ａが位置する側を第二フランジ部１Ｂとしている。このナット４Ｂと第一フランジ部１Ａとの間および連結ボルト４Ａの頭部４ａと第二フランジ部１Ｂとの間には、夫々ワッシャ４Ｃ，４Ｃが介在している。このように、連結ボルト４Ａとナット４Ｂとワッシャ４Ｃ，４Ｃとで、両フランジ部１Ａ，１Ｂを連結する連結機構を構成している。なお、ワッシャ４Ｃ，４Ｃを省略しても良い。 1 to 3 show a flange joint part in the middle of a fluid piping system (pipe line). Both flange portions 1A and 1B formed in a disk shape projecting radially outward from the end portions of both cast iron water pipes 1 and 1, which are an example of a fluid pipe, respectively include a plurality of connecting bolts 4A and nuts 4B ( In the present embodiment, they are connected by 8 places). In this embodiment, the side where the nut 4B is located is the first flange portion 1A, and the side where the head 4a of the connecting bolt 4A is located is the second flange portion 1B. Washers 4C and 4C are respectively interposed between the nut 4B and the first flange portion 1A and between the head portion 4a of the connecting bolt 4A and the second flange portion 1B. In this way, the connecting bolt 4A, the nut 4B, and the washers 4C, 4C constitute a connecting mechanism for connecting the flange portions 1A, 1B. The washers 4C and 4C may be omitted.

この両フランジ部１Ａ，１Ｂの間には、リング状でシート状のガスケット２が介装されている。両フランジ部１Ａ，１Ｂには、フランジ接合方向（軸方向、以下「接合方向」と言う。）に貫通する複数の貫通孔３（本実施形態では、８箇所ずつ）が周方向で等間隔に形成され、これら貫通孔３に連結ボルト４Ａが挿通されて、当該連結ボルト４Ａの雄ネジ部４ｂの先端側にナット４Ｂが螺合固定される。なお、本実施形態の両フランジ部１Ａ，１Ｂは、貫通孔３の内側に平らな座面を設けた所謂ＲＦ形フランジである。 A ring-shaped sheet-shaped gasket 2 is interposed between the flange portions 1A and 1B. A plurality of through holes 3 (eight in this embodiment) penetrating in the flange joining direction (axial direction, hereinafter referred to as "joining direction") is formed in both flange portions 1A and 1B at equal intervals in the circumferential direction. The connecting bolt 4A is formed through these through holes 3, and the nut 4B is screwed and fixed to the tip end side of the male screw portion 4b of the connecting bolt 4A. Both the flange portions 1A and 1B of the present embodiment are so-called RF type flanges having a flat seat surface inside the through hole 3.

以下では、両フランジ部１Ａ，１Ｂにおいて、夫々水道管１が突出する側の面を接合方向における外側面１ａ，１ａとする。また、両フランジ部の１Ａ，１Ｂの径方向外方側の面を外周面１ｃ，１ｃとして説明する。 Below, in both flange parts 1A and 1B, the surface on which the water pipe 1 projects will be referred to as outer surfaces 1a and 1a in the joining direction. In addition, the surfaces on the radially outer side of the flange portions 1A and 1B will be described as outer peripheral surfaces 1c and 1c.

図４〜図６，図９に示すように、補強治具Ｐは、第一フランジ部１Ａの外側面１ａを押圧する第一押圧部６ｅを有する第一挟持部材６と、第二フランジ部１Ｂの外側面１ａを押圧する第二押圧部５ｅを有する第二挟持部材５と、を備えている。これら両押圧部６ｅ，５ｅには、例えば、細かな凹凸を形成したり、ゴム部材を両押圧部６ｅ，５ｅの表面に張り付けたりして、両フランジ部１Ａ，１Ｂの外側面１ａ，１ａに対して摩擦抵抗が生じるように摩擦加工が施されている。なお、両押圧部６ｅ，５ｅに摩擦加工を施さなくても良いし、摩擦加工の態様も特に限定されない。 As shown in FIGS. 4 to 6 and 9, the reinforcing jig P includes a first holding member 6 having a first pressing portion 6e that presses the outer surface 1a of the first flange portion 1A, and a second flange portion 1B. And a second holding member 5 having a second pressing portion 5e that presses the outer side surface 1a. The both pressing portions 6e, 5e may be formed on the outer surfaces 1a, 1a of the two flange portions 1A, 1B by, for example, forming fine irregularities or by sticking a rubber member on the surfaces of the pressing portions 6e, 5e. Friction processing is performed so that frictional resistance is generated. It should be noted that both pressing portions 6e and 5e may not be subjected to friction processing, and the mode of friction processing is not particularly limited.

また、両押圧部６ｅ，５ｅを両フランジ部１Ａ，１Ｂの外側面１ａ，１ａに夫々当て付けた状態で、両挟持部材６，５（両押圧部６ｅ，５ｅ）を接合方向に引き寄せて（近接させて）固定する締結機構７を備えている。 Further, with both pressing portions 6e, 5e abutting on the outer side surfaces 1a, 1a of the flange portions 1A, 1B, respectively, the both holding members 6, 5 (both pressing portions 6e, 5e) are pulled in the joining direction ( A fastening mechanism 7 for fixing (closely) is provided.

図４に示すように、第一挟持部材６は、金属部材により構成され、横断面視で外面６ａ及び内面６ｂが四角形状の有底角筒状に形成された被挿入部６Ａと、被挿入部６Ａの一端部において被挿入部６Ａの外面６ａの四辺のうちの一辺から外方側に延出し、第一押圧部６ｅを有する第一基部６Ｂ（基部の一例）と、第一基部６Ｂの側面から延出形成される脱落防止腕６Ｃと、を一体的に備えて構成されている。なお、脱落防止腕６Ｃを第一基部６Ｂの先端面から延出形成しても良いし、脱落防止腕６Ｃを別途製作して第一基部６Ｂに接合しても良く、特に限定されない。 As shown in FIG. 4, the first holding member 6 is formed of a metal member, and the inserted portion 6A in which the outer surface 6a and the inner surface 6b are formed in a rectangular bottomed rectangular tube shape in a cross-sectional view, and the inserted portion 6A. The first base portion 6B (an example of the base portion) that extends outward from one of the four sides of the outer surface 6a of the inserted portion 6A and has the first pressing portion 6e at one end of the portion 6A, and the first base portion 6B. The fall prevention arm 6C extending from the side surface is integrally provided. Note that the cap 6C may be formed so as to extend from the tip end surface of the first base 6B, or the cap 6C may be separately manufactured and joined to the first base 6B, and there is no particular limitation.

被挿入部６Ａは、側面視で正方形状に形成され（図４斜視図参照）、被挿入部６Ａの内部には、接合方向に沿って第二挟持部材５の挿入部５Ａを受け入れる筒状内部空間６ｃが形成されている。つまり、図６に示すように、補強治具Ｐが両フランジ部１Ａ，１Ｂに装着されるとき、第一フランジ部１Ａの外周面１ｃよりも径方向外側の位置において、後述する第二挟持部材５に挿入部５Ａが形成され、第一挟持部材６には接合方向に沿って挿入部５Ａを内部に受け入れる被挿入部６Ａが形成されている。 The inserted portion 6A is formed in a square shape in a side view (see the perspective view of FIG. 4), and the inside of the inserted portion 6A has a cylindrical interior that receives the insertion portion 5A of the second holding member 5 along the joining direction. A space 6c is formed. That is, as shown in FIG. 6, when the reinforcing jig P is mounted on both flange portions 1A and 1B, a second holding member described later is provided at a position radially outside of the outer peripheral surface 1c of the first flange portion 1A. 5 has an insertion portion 5A, and the first holding member 6 has an insertion portion 6A that receives the insertion portion 5A inside along the joining direction.

筒状内部空間６ｃは横断面視で正方形状に形成され、横断面視で正方形状の挿入部５Ａよりも若干大きく形成されている。このため、挿入部５Ａの外面５ａと被挿入部６Ａの内面６ｂとの接合方向に垂直な形状は、挿入部５Ａを被挿入部６Ａの筒状内部空間６ｃに挿入すると、挿入方向（筒状内部空間６ｃの長手方向）には摺動可能であるが、挿入方向周り（筒状内部空間６ｃの長手方向に沿った軸周り）での相対回転が不能となるように形成されている。 The cylindrical internal space 6c is formed in a square shape in a cross sectional view, and is slightly larger than the square insertion portion 5A in the cross sectional view. For this reason, the shape perpendicular to the joining direction of the outer surface 5a of the insertion portion 5A and the inner surface 6b of the inserted portion 6A has a shape (cylindrical shape) when the insertion portion 5A is inserted into the cylindrical internal space 6c of the insertion portion 6A. Although it is slidable in the longitudinal direction of the internal space 6c, it is formed so that relative rotation is not possible around the insertion direction (around the axis along the longitudinal direction of the tubular internal space 6c).

また、筒状内部空間６ｃにおいて、第一基部６Ｂが形成された側とは反対側は開口形成され、第一基部６Ｂが形成された側は、締結ボルト７Ａの雄ネジ部７ａを挿入可能で且つ頭部７ｂを挿通不能な挿通孔６ｄが、被挿入部６Ａの底部を貫通する状態で開口形成されている（図４断面図参照）。なお、締結ボルト７Ａの雄ネジ部７ａが挿通孔６ｄに挿通された状態では、雄ネジ部７ａの外周面と挿通孔６ｄの内周面との間には、所定の隙間が形成される（図９参照）。 Further, in the cylindrical internal space 6c, an opening is formed on the side opposite to the side on which the first base portion 6B is formed, and on the side on which the first base portion 6B is formed, the male screw portion 7a of the fastening bolt 7A can be inserted. Moreover, an insertion hole 6d that cannot be inserted through the head portion 7b is formed so as to penetrate the bottom portion of the inserted portion 6A (see the cross-sectional view in FIG. 4). When the male screw portion 7a of the fastening bolt 7A is inserted into the insertion hole 6d, a predetermined gap is formed between the outer peripheral surface of the male screw portion 7a and the inner peripheral surface of the insertion hole 6d ( (See FIG. 9).

第一基部６Ｂは、側面視で若干先窄み形状に形成され（図４平面図参照）、縦断面視で先端側に行くにつれて第一押圧部６ｅが形成された側とは反対側が傾斜するテーパ形状に形成されている（図４断面図参照）。また、第一基部６Ｂのうち挿通孔６ｄとは反対側の面の先端部位が、被挿入部６Ａの外面６ａと垂直な第一押圧部６ｅとして形成されている。つまり、第一基部６Ｂは、第一押圧部６ｅを支持する機能を有している。 The first base portion 6B is formed in a slightly tapered shape in a side view (see the plan view of FIG. 4), and the side opposite to the side on which the first pressing portion 6e is formed inclines toward the distal end side in a longitudinal sectional view. It is formed in a tapered shape (see the cross-sectional view of FIG. 4). Further, the tip portion of the surface of the first base portion 6B opposite to the insertion hole 6d is formed as a first pressing portion 6e which is perpendicular to the outer surface 6a of the inserted portion 6A. That is, the first base portion 6B has a function of supporting the first pressing portion 6e.

脱落防止腕６Ｃは、第一基部６Ｂの側面から延出形成されるＬ字状又はＣ字状部材であり（図４平面図、図４斜視図参照）、連結ボルト４Ａに螺合されたナット４Ｂの少なくとも一部を囲うことができるように、ナット４Ｂの外周よりも大径に形成されている。この脱落防止腕６Ｃは、補強治具Ｐを両フランジ部１Ａ，１Ｂに装着した際、ナット４Ｂに対して内側から径外方向に向かって当接する（図６参照）。また、縦断面視で、脱落防止腕６Ｃを構成する面のうち、筒状内部空間６ｃの長手方向における挿通孔６ｄとは反対側の面は、装着時に第一フランジ部１Ａに対して隙間を有するように、第一押圧部６ｅよりも挿通孔６ｄ側に引退形成されている（図４断面図参照）。なお、第一挟持部材６と第二挟持部材５とを反対に装着して、連結ボルト４Ａの頭部４ａに脱落防止腕６Ｃを当接させても良く、特に限定されない。 The fall prevention arm 6C is an L-shaped or C-shaped member that is formed to extend from the side surface of the first base portion 6B (see FIG. 4 plan view and FIG. 4 perspective view), and is a nut screwed to the connecting bolt 4A. 4B is formed with a diameter larger than the outer circumference of the nut 4B so as to surround at least a part of 4B. When the reinforcing jig P is attached to both the flange portions 1A and 1B, the drop-off preventing arm 6C comes into contact with the nut 4B from the inner side toward the radially outer side (see FIG. 6). Further, in a vertical cross-sectional view, among the surfaces forming the cap 6C, the surface on the side opposite to the insertion hole 6d in the longitudinal direction of the cylindrical internal space 6c has a gap with respect to the first flange portion 1A during mounting. As it has, it is formed so as to be retracted closer to the insertion hole 6d side than the first pressing portion 6e (see the cross-sectional view of FIG. 4). The first holding member 6 and the second holding member 5 may be mounted opposite to each other, and the cap 4C of the connecting bolt 4A may be brought into contact with the cap 6C, which is not particularly limited.

図７〜図８に示すように、脱落防止腕６Ｃは、ナット４Ｂに対して接合方向に（第一フランジ部１Ａに向かって）引退するよう、少なくともナット４Ｂに当接する縁部６Ｃａの厚みが他の部位よりも小さく設定されている。特に、本実施形態における脱落防止腕６Ｃの縁部６Ｃａは、第一フランジ部１Ａに向かって段落ちした段差部６Ｃｃが、第一基部６Ｂと脱落防止腕６Ｃとの接続部から先端部６Ｃｂに亘って形成されている。つまり、脱落防止腕６Ｃの天面６Ｃｄよりも第一フランジ部１Ａに向かって引退するように、縁部６Ｃａには径方向内側に向かって断面Ｌ字状の切欠きが形成されている。縁部６Ｃａの切欠きは、ナット４Ｂを締付けるラチェットやスパナなどの締付工具（不図示）が挿入できる大きさに設定されている。このような段差部６Ｃｃ（切欠き）を形成すれば、ナット４Ｂの側面と段差部６Ｃｃの側壁との間に凹状の隙間が形成されるので、締付工具が挿入し易く、締付工具の先端部をナット４Ｂに引っ掛け易い。 As shown in FIGS. 7 to 8, the cap 6C has at least a thickness of the edge portion 6Ca that abuts the nut 4B so as to retract in the joining direction (toward the first flange portion 1A) with respect to the nut 4B. It is set smaller than other parts. In particular, in the edge portion 6Ca of the cap 6C of the present embodiment, the stepped portion 6Cc that is stepped down toward the first flange portion 1A extends from the connecting portion between the first base 6B and the cap 6C to the tip portion 6Cb. It is formed over. That is, the edge portion 6Ca is formed with a notch having an L-shaped cross section inward in the radial direction so that the edge portion 6Ca is retracted toward the first flange portion 1A with respect to the top surface 6Cd of the cap 6C. The notch of the edge portion 6Ca is set to a size such that a tightening tool (not shown) such as a ratchet or a spanner for tightening the nut 4B can be inserted. If such a step portion 6Cc (notch) is formed, a concave gap is formed between the side surface of the nut 4B and the side wall of the step portion 6Cc, so that the tightening tool can be easily inserted and the tightening tool It is easy to hook the tip on the nut 4B.

また、縁部６Ｃａは、円弧状に形成され、六角形のナット４Ｂの頂点に点接触している。なお、縁部６Ｃａをワッシャ４Ｃに面接触させても良いし、ナット４Ｂを円弧状に形成して縁部６Ｃａを面接触させても良く、特に限定されない。また、ナット４Ｂを六角形以外の多角形状に構成しても良いし、縁部６Ｃａをナット４Ｂの外形に沿った形状に構成しても良い。 The edge portion 6Ca is formed in an arc shape and is in point contact with the apex of the hexagonal nut 4B. The edge 6Ca may be brought into surface contact with the washer 4C, or the nut 4B may be formed in an arc shape so that the edge 6Ca is brought into surface contact, and there is no particular limitation. Further, the nut 4B may be formed in a polygonal shape other than the hexagon, and the edge portion 6Ca may be formed in a shape along the outer shape of the nut 4B.

これによって、自重或いは地震等により、両フランジ部１Ａ，１Ｂに歪みや変形或いは相対的なずれ等が生じた場合でも、脱落防止腕６Ｃがナット４Ｂに確実に当接するので、補強治具Ｐが両フランジ部１Ａ，１Ｂから脱落することをより確実に防止することができる。 As a result, even if the two flange portions 1A and 1B are distorted or deformed or are relatively displaced due to their own weight or an earthquake, the fall prevention arm 6C surely abuts the nut 4B. It is possible to more reliably prevent the flanges 1A and 1B from falling off.

図５に示すように、第二挟持部材５は、金属材料により構成され、横断面視で外面５ａが四角形状且つ内周面５ｂが円形状の有底角筒状に形成された挿入部５Ａと、挿入部５Ａの一端部において挿入部５Ａの外面５ａから全周に亘って外方側に延出する鍔状部５Ｂと、鍔状部５Ｂの四辺のうちの一辺からさらに外方側に延出する第二基部５Ｃとを一体的に備えて構成されている。 As shown in FIG. 5, the second holding member 5 is made of a metal material, and has an insertion portion 5A formed in a bottomed rectangular tube shape having a quadrangular outer surface 5a and a circular inner peripheral surface 5b in a cross-sectional view. And a collar-shaped portion 5B extending outward from the outer surface 5a of the insertion portion 5A over the entire circumference at one end of the insertion portion 5A, and further outward from one of the four sides of the collar-shaped portion 5B. It is configured to integrally include the extending second base portion 5C.

挿入部５Ａは、側面視で正方形状に形成され（図５斜視図参照）、挿入部５Ａの内部には、後述する締結機構７の締結ボルト７Ａの雄ネジ部７ａを挿通可能な円筒状の筒状内部空間５ｃが形成されている。筒状内部空間５ｃの内径は、締結ボルト７Ａの雄ネジ部７ａの外径よりも若干大径に形成されている。 The insertion portion 5A is formed in a square shape in a side view (see FIG. 5 perspective view), and has a cylindrical shape into which the male screw portion 7a of the fastening bolt 7A of the fastening mechanism 7 described later can be inserted. A cylindrical internal space 5c is formed. The inner diameter of the cylindrical inner space 5c is formed to be slightly larger than the outer diameter of the male screw portion 7a of the fastening bolt 7A.

鍔状部５Ｂは、側面視で正方形状に形成され、中央部に筒状内部空間５ｃが貫通形成されている（図５断面図参照）。 The collar-shaped portion 5B is formed in a square shape in a side view, and a cylindrical internal space 5c is formed in the center portion thereof so as to penetrate therethrough (see the cross-sectional view of FIG. 5).

筒状内部空間５ｃにおいて、鍔状部５Ｂ及び第二基部５Ｃが形成された側は開口形成され、鍔状部５Ｂ及び第二基部５Ｃが形成された側とは反対側は、締結ボルト７Ａの雄ネジ部７ａが螺合可能な雌ネジ部５ｄが、挿入部５Ａの底部を貫通する状態で開口形成されている。すなわち、雌ネジ部５ｄは、挿入部５Ａにおける筒状内部空間５ｃの内周面５ｂにおいて、鍔状部５Ｂ及び第二基部５Ｃが形成された側とは反対側の端部に形成されている。 In the tubular internal space 5c, an opening is formed on the side on which the collar-shaped portion 5B and the second base portion 5C are formed, and on the side opposite to the side on which the collar-shaped portion 5B and the second base portion 5C are formed, the fastening bolt 7A A female screw portion 5d to which the male screw portion 7a can be screwed is formed so as to penetrate the bottom portion of the insertion portion 5A. That is, the female screw portion 5d is formed on the inner peripheral surface 5b of the cylindrical internal space 5c in the insertion portion 5A at the end portion on the opposite side to the side where the collar-shaped portion 5B and the second base portion 5C are formed. .

第二基部５Ｃは、側面視で若干先窄み形状に形成され（図５平面図参照）、縦断面視で先端側に行くにつれて雌ネジ部５ｄの側に傾斜するテーパ形状に形成されている（図５断面図参照）。また、第二基部５Ｃのうち雌ネジ部５ｄの側の面の先端部位が、挿入部５Ａの外面５ａと垂直な第二押圧部５ｅとして形成されている。 The second base portion 5C is formed in a slightly tapered shape in a side view (see the plan view of FIG. 5), and is formed in a taper shape that is inclined toward the female screw portion 5d as it goes to the distal end side in a longitudinal sectional view. (See FIG. 5 cross section). Further, the tip portion of the surface of the second base portion 5C on the female screw portion 5d side is formed as a second pressing portion 5e perpendicular to the outer surface 5a of the insertion portion 5A.

図６，図９に示すように、締結機構７は、被挿入部６Ａの外側から挿通孔６ｄを介して筒状内部空間６ｃ内に挿入される締結ボルト７Ａと、挿入部５Ａの内周面５ｂに形成された雌ネジ部５ｄと、締結ボルト７Ａと鍔状部５Ｂとの間に介在するワッシャ７Ｂとから構成されている。なお、締結ボルト７Ａと鍔状部５Ｂとの間のワッシャ７Ｂを省略しても良い。 As shown in FIGS. 6 and 9, the fastening mechanism 7 includes a fastening bolt 7A that is inserted into the tubular internal space 6c from the outside of the inserted portion 6A through the insertion hole 6d, and an inner peripheral surface of the insertion portion 5A. 5b, and a washer 7B interposed between the fastening bolt 7A and the collar-shaped portion 5B. The washer 7B between the fastening bolt 7A and the collar-shaped portion 5B may be omitted.

上述した補強治具Ｐの六面図が、図１０〜図１５に示される。なお、補強治具Ｐの六面図には、両フランジ部１Ａ，１Ｂの接合部を介さずに、第二挟持部材５の挿入部５Ａを第一挟持部材６の被挿入部６Ａに挿入し、締結機構７で固定した状態が示されている。 Six-sided views of the above-described reinforcing jig P are shown in FIGS. 10 to 15. In addition, in the six-sided view of the reinforcing jig P, the insertion portion 5A of the second holding member 5 is inserted into the insertion portion 6A of the first holding member 6 without the joint portion between the flange portions 1A and 1B. , The state of being fixed by the fastening mechanism 7 is shown.

本実施形態における補強治具Ｐの特徴構成は、脱落防止腕６Ｃは、内周面の縁部６Ｃａに、段差部６Ｃｃが、第一基部６Ｂから先端部６Ｃｂに亘って形成されている点にある。この脱落防止腕６Ｃは、両フランジ部１Ａ，１Ｂの連結ボルト４Ａの頭部４ａ又は連結ボルト４Ａに螺合されたナット４Ｂに当接して、補強治具Ｐの脱落を防止するものである。なお、本実施形態における脱落防止腕６Ｃを、後述する変形例の脱落防止腕６１Ｃ，６２Ｃ，６３Ｃに変更しても良い。この場合、脱落防止腕６Ｃの形状のみを変更した六面図となるので、詳細な図面は省略する。 The characteristic configuration of the reinforcing jig P in the present embodiment is that the fall prevention arm 6C has a stepped portion 6Cc formed on the edge portion 6Ca of the inner peripheral surface from the first base portion 6B to the tip portion 6Cb. is there. The fall-off preventing arm 6C contacts the head 4a of the connecting bolt 4A of the flanges 1A and 1B or the nut 4B screwed to the connecting bolt 4A to prevent the reinforcing jig P from falling off. The cap 6C of the present embodiment may be replaced with caps 61C, 62C and 63C of modified examples described later. In this case, only the shape of the fall prevention arm 6C is changed to a hexagonal view, and detailed drawings are omitted.

次に、複数の連結ボルト４Ａ及びナット４Ｂにより連結された両フランジ部１Ａ，１Ｂに、補強治具Ｐを装着する作業工程について説明する。 Next, a work process of mounting the reinforcing jig P on both flange portions 1A and 1B connected by the plurality of connecting bolts 4A and nuts 4B will be described.

まず、図１〜図３に示すように、両フランジ部１Ａ，１Ｂの既設ボルト，ナット（不図示）を１本取り外し、連結ボルト４Ａ及びナット４Ｂに付け替える。順次、この付け替えを全ての既設ボルト，ナットに対して行う。この際、本実施形態では、締付工具の挿入スペースとして脱落防止腕６Ｃに薄肉の縁部６Ｃａを有しているので、連結ボルト４Ａ及びナット４Ｂを高ナットに対応したボルト及び高ナットで構成する必要がない。その結果、通常のボルト及びナットを用いることが可能となるので、装置コストを節約できる。 First, as shown in FIGS. 1 to 3, one of the existing bolts and nuts (not shown) of both flange portions 1A and 1B is removed and replaced with connecting bolts 4A and nuts 4B. Repeat this replacement for all existing bolts and nuts. At this time, in the present embodiment, since the fall prevention arm 6C has the thin edge portion 6Ca as an insertion space for the tightening tool, the connecting bolt 4A and the nut 4B are composed of a bolt and a high nut corresponding to the high nut. You don't have to. As a result, ordinary bolts and nuts can be used, which saves the cost of the device.

次いで、図６に示すように、両フランジ部１Ａ，１Ｂの外周面１ｃ，１ｃよりも径方向外方側の位置で、第二挟持部材５の挿入部５Ａを、第一挟持部材６の被挿入部６Ａの筒状内部空間６ｃに接合方向から挿入する。その際、挿入部５Ａの外面５ａと被挿入部６Ａの内面６ｂとが横断面視で相対回転不能な正方形状に形成されているので、第一挟持部材６の第一押圧部６ｅと第二挟持部材５の第二押圧部５ｅとを同方向に延出させた所期の相対位置関係に位置決めした状態で、容易に挿入させることができる。 Next, as shown in FIG. 6, the insertion portion 5A of the second holding member 5 is attached to the first holding member 6 at a position radially outward of the outer peripheral surfaces 1c and 1c of the two flange portions 1A and 1B. The insertion portion 6A is inserted into the cylindrical inner space 6c from the joining direction. At that time, since the outer surface 5a of the insertion portion 5A and the inner surface 6b of the insertion portion 6A are formed in a square shape that is relatively non-rotatable in a cross sectional view, the first pressing portion 6e of the first holding member 6 and the second pressing portion 6e. It can be easily inserted in a state where the second pressing portion 5e of the holding member 5 and the second pressing portion 5e are positioned in the intended relative positional relationship in which they are extended in the same direction.

次いで、締結ボルト７Ａを、接合方向における被挿入部６Ａの外側から挿通孔６ｄを介して筒状内部空間６ｃの内部に挿入し、仮固定する。これら挿入部５Ａと被挿入部６Ａとの係合および締結ボルト７Ａの仮固定は、一旦、接合方向において、第一挟持部材６の第一押圧部６ｅと第二挟持部材５の第二押圧部５ｅとの間隔が、第一フランジ部１Ａの外側面１ａと第二フランジ部１Ｂの外側面１ａとの間隔よりも若干大きくなる程度に行われる。つまり、接合方向における被挿入部６Ａと挿入部５Ａとの重なり部位の大きさ（挿入距離）、及び、第一押圧部６ｅと第二押圧部５ｅとの間隔を夫々、適宜設定することができる。このため、両フランジ部１Ａ，１Ｂの呼び径や設計圧力に応じて肉厚が変更される場合でも、重なり部位の大きさを調整することで、第一挟持部材６及び第二挟持部材５を両フランジ部１Ａ，１Ｂに良好に締付固定することができる。 Next, the fastening bolt 7A is inserted from the outside of the inserted portion 6A in the joining direction into the cylindrical internal space 6c through the insertion hole 6d and temporarily fixed. The engagement between the insertion portion 5A and the insertion portion 6A and the temporary fixing of the fastening bolt 7A are performed once in the joining direction by the first pressing portion 6e of the first holding member 6 and the second pressing portion of the second holding member 5. The distance to 5e is set to be slightly larger than the distance between the outer surface 1a of the first flange portion 1A and the outer surface 1a of the second flange portion 1B. That is, the size (insertion distance) of the overlapped portion between the inserted portion 6A and the insertion portion 5A in the joining direction and the interval between the first pressing portion 6e and the second pressing portion 5e can be appropriately set. . Therefore, even when the wall thickness is changed according to the nominal diameter of both flange portions 1A and 1B and the design pressure, the size of the overlapping portion is adjusted to allow the first holding member 6 and the second holding member 5 to be adjusted. It can be satisfactorily tightened and fixed to both flange portions 1A and 1B.

続いて、補強治具Ｐを両フランジ部１Ａ，１Ｂに装着する。このとき、第一押圧部６ｅが延出する側における被挿入部６Ａの外面６ａを両フランジ部１Ａ，１Ｂの外周面１ｃ，１ｃの少なくとも一方に径外方向から片当たりさせる。また、第一挟持部材６の脱落防止腕６Ｃを、ナット４Ｂに対して、内側から径外方向に当接或いは近接させた状態とする（図７参照）。 Subsequently, the reinforcing jig P is attached to both the flange portions 1A and 1B. At this time, the outer surface 6a of the inserted portion 6A on the side where the first pressing portion 6e extends is brought into partial contact with at least one of the outer peripheral surfaces 1c, 1c of both flange portions 1A, 1B from the radially outer side. Further, the drop-out preventing arm 6C of the first holding member 6 is brought into contact with or close to the nut 4B in the radially outward direction from the inside (see FIG. 7).

この脱落防止腕６Ｃの延出方向は、締結ボルト７Ａを締付側に回転させたとき、脱落防止腕６Ｃが設けられている第一挟持部材６が共回りする方向と同方向に設定されている。つまり、脱落防止腕６Ｃは、第一挟持部材６の第一基部６Ｂの側面から、締結ボルト７Ａの締付方向（本実施形態では、締結ボルト７Ａは右ネジであるので、挿通孔６ｄを中心とする時計回り方向）に向かって延出するように形成されている。このため、締結ボルト７Ａを締付ける際、脱落防止腕６Ｃがナット４Ｂと当接して回転抵抗となるので、締付作業が容易である。 The extension direction of the cap 6C is set in the same direction as the direction in which the first holding member 6 provided with the cap 6C rotates when the fastening bolt 7A is rotated to the tightening side. There is. That is, the fall-off preventing arm 6C is tightened in the tightening direction of the fastening bolt 7A from the side surface of the first base portion 6B of the first holding member 6 (in the present embodiment, the fastening bolt 7A is a right-hand screw, and therefore the insertion hole 6d is centered). It is formed so as to extend in the clockwise direction). Therefore, when the fastening bolt 7A is tightened, the drop-out preventing arm 6C comes into contact with the nut 4B and becomes a rotation resistance, so that the tightening work is easy.

なお、ナット４Ｂの径方向内側に脱落防止腕６Ｃを挿入するスペースがない場合は、補強治具Ｐを上下反対にして装着しても良い。この場合、脱落防止腕６Ｃは、第二フランジ部１Ｂに位置する連結ボルト４Ａの頭部４ａに対して、内側から径外方向に当接或いは近接する。 In addition, when there is no space to insert the fall prevention arm 6C inside the nut 4B in the radial direction, the reinforcing jig P may be mounted upside down. In this case, the fall prevention arm 6C abuts or approaches the head 4a of the connecting bolt 4A located on the second flange portion 1B from the inside in the radial outward direction.

次いで、第一挟持部材６の第一押圧部６ｅが第一フランジ部１Ａの外側面１ａを押圧し、且つ、第二挟持部材５の第二押圧部５ｅが第二フランジ部１Ｂの外側面１ａを押圧するまで、締結ボルト７Ａを締付け、挿入部５Ａ及び被挿入部６Ａを接合方向に引き寄せる。これによって、補強治具Ｐが時計回りに共回りし、脱落防止腕６Ｃとナット４Ｂとが確実に当接する。 Next, the first pressing portion 6e of the first holding member 6 presses the outer side surface 1a of the first flange portion 1A, and the second pressing portion 5e of the second holding member 5 is the outer side surface 1a of the second flange portion 1B. The fastening bolt 7A is tightened until is pressed, and the insertion portion 5A and the insertion portion 6A are pulled in the joining direction. As a result, the reinforcing jig P rotates in the clockwise direction, and the drop prevention arm 6C and the nut 4B surely come into contact with each other.

補強治具Ｐを装着後、同様に、両フランジ部１Ａ，１Ｂにおけるその他のナット４Ｂに対して、別の補強治具Ｐを径外方向から順次装着する。本実施形態では、補強治具Ｐが装着させるナット４Ｂは、８箇所のうち、３箇所の一組どうしが第一フランジ部１Ａの中心に対して対称となる計６箇所に装着される。なお、補強治具Ｐの装着は、必要に応じて、全てのナット４Ｂに対して行っても良いし、ナット４Ｂの隣接間部位の一部に対してのみ行うこととしても良い。 After mounting the reinforcing jig P, similarly, another reinforcing jig P is sequentially mounted from the radially outer direction to the other nuts 4B in both the flange portions 1A and 1B. In the present embodiment, the nuts 4B to be mounted by the reinforcing jig P are mounted at a total of 6 positions where one set of 3 positions out of 8 positions is symmetrical with respect to the center of the first flange portion 1A. The reinforcing jig P may be attached to all the nuts 4B as necessary, or may be attached only to a part of a portion between the nuts 4B adjacent to each other.

次いで、締結ボルト７Ａの雄ネジ部７ａを挿入部５Ａの雌ネジ部５ｄに螺合させて、全ての補強治具Ｐの締結機構７の締増しを行う。このとき、締結ボルト７Ａは、両フランジ部１Ａ，１Ｂより径方向外側の位置にあるため、締付作業が容易である。しかも、脱落防止腕６Ｃがナット４Ｂに当接した状態であるので、締付姿勢が安定する。 Next, the male screw portion 7a of the fastening bolt 7A is screwed into the female screw portion 5d of the insertion portion 5A to tighten the fastening mechanism 7 of all the reinforcing jigs P. At this time, the fastening bolt 7A is located radially outside the both flange portions 1A and 1B, so that the tightening work is easy. Moreover, since the fall prevention arm 6C is in contact with the nut 4B, the tightening posture is stable.

締結ボルト７Ａを締付固定すると、両挟持部材６，５の両押圧部６ｅ，５ｅは、両フランジ部１Ａ，１Ｂの外側面１ａ，１ａに当接した状態で近接移動する。同時に、第一フランジ部１Ａと第二フランジ部１Ｂとが締結ボルト７Ａの締付力によって互いに近接方向に移動する。その結果、ナット４Ｂをさらに締付けることが可能となる。 When the fastening bolt 7A is tightened and fixed, the pressing portions 6e and 5e of the sandwiching members 6 and 5 move close to each other while being in contact with the outer surfaces 1a and 1a of the flange portions 1A and 1B. At the same time, the first flange portion 1A and the second flange portion 1B move toward each other by the tightening force of the fastening bolt 7A. As a result, the nut 4B can be further tightened.

また、補強治具Ｐが両フランジ部１Ａ，１Ｂに固定された状態では、第一押圧部６ｅおよび第二押圧部５ｅの中心が、ナット４Ｂの外形を周方向に延長させた仮想円環面の領域内に位置することとなる。このため、第一押圧部６ｅおよび第二押圧部５ｅが近接移動することで、ナット４Ｂと第一フランジ部１Ａとの間には一定の隙間が形成され易く、ナット４Ｂが第一フランジ部１Ａに対して片当たり状態となる不都合がない。このため、ナット４Ｂを締付けた際、両フランジ部１Ａ，１Ｂが均一に近接移動する。 Further, in a state where the reinforcing jig P is fixed to both the flange portions 1A and 1B, the centers of the first pressing portion 6e and the second pressing portion 5e are imaginary annular surfaces obtained by extending the outer shape of the nut 4B in the circumferential direction. It will be located in the area of. Therefore, the first pressing portion 6e and the second pressing portion 5e move close to each other, so that a constant gap is easily formed between the nut 4B and the first flange portion 1A, and the nut 4B moves toward the first flange portion 1A. On the other hand, there is no inconvenience of a one-sided contact. Therefore, when the nut 4B is tightened, both the flange portions 1A and 1B move uniformly closer to each other.

次いで、両フランジ部１Ａ，１Ｂを接合する全てのナット４Ｂに対して、ラチェットやスパナなどの締付工具を用いて締増しを行う。このとき、スパナ等の別の工具を用いて、連結ボルト４Ａを固定した状態とする。 Then, tightening is performed on all the nuts 4B that join the two flange portions 1A and 1B using a tightening tool such as a ratchet or a spanner. At this time, the connecting bolt 4A is fixed using another tool such as a spanner.

本実施形態では、脱落防止腕６Ｃの縁部６Ｃａが、ナット４Ｂに対して接合方向に引退するよう、第一フランジ部１Ａに向かって段落ちした段差部６Ｃｃが、第一基部６Ｂから先端部６Ｃｂに亘って形成されている（図８参照）。つまり、ナット４Ｂの周りは、脱落防止腕６Ｃの高さがナット４Ｂの高さより小さく設定されている。このため、ナット４Ｂの締付けを行う際、ナット４Ｂの周りに締付工具を確実に挿入することができる。 In the present embodiment, the stepped portion 6Cc that is stepped down toward the first flange portion 1A so that the edge portion 6Ca of the drop-off prevention arm 6C retracts in the joining direction with respect to the nut 4B is a tip portion from the first base portion 6B. It is formed over 6 Cb (see FIG. 8). In other words, around the nut 4B, the height of the fall prevention arm 6C is set smaller than the height of the nut 4B. Therefore, when tightening the nut 4B, the tightening tool can be reliably inserted around the nut 4B.

次いで、連結ボルト４Ａ，ナット４Ｂおよび締結ボルト７Ａの締付トルクが所定の基準値（例えば、呼び径２５０ｍｍで９０Ｎ・ｍ）となるまで、締結ボルト７Ａとナット４Ｂとの締増しを交互に行う。これによって、補強治具Ｐによる両フランジ部１Ａ，１Ｂの接合強度をより向上させて、両フランジ部１Ａ，１Ｂの離間やずれ及びこれらに伴う上水の漏洩をより確実に防止することができ、管路の耐震性能の向上をも図ることができる。 Then, the tightening torque of the connecting bolt 4A, the nut 4B, and the fastening bolt 7A is alternately increased until the tightening torque reaches a predetermined reference value (for example, 90 N · m at a nominal diameter of 250 mm). . As a result, the joint strength of the flanges 1A and 1B by the reinforcing jig P can be further improved, and the separation and displacement of the flanges 1A and 1B and the leakage of clean water accompanying them can be prevented more reliably. It is also possible to improve the seismic performance of pipelines.

図９に示すように、本実施形態では、締結機構７の締結部位に加えて、挿入部５Ａと被挿入部６Ａとの重なり部位を有している。このため、両フランジ部１Ａ，１Ｂを径方向に位置ずれさせる剪断力が作用した場合や、両フランジ部１Ａ，１Ｂを軸方向に引き離す引張力が作用して両挟持部材６，５の両押圧部６ｅ，５ｅが開き方向の力を受けた場合でも、締結機構７の締結部位に掛かる応力の低減を図ることができる。 As shown in FIG. 9, in the present embodiment, in addition to the fastening portion of the fastening mechanism 7, there is an overlapping portion of the insertion portion 5A and the inserted portion 6A. Therefore, when a shearing force that displaces the flange portions 1A and 1B in the radial direction acts, or a tensile force that separates the flange portions 1A and 1B in the axial direction acts, the both pressing members 6 and 5 are pressed. Even when the portions 6e, 5e receive a force in the opening direction, it is possible to reduce the stress applied to the fastening portion of the fastening mechanism 7.

本実施形態では、雌ネジ部５ｄを、筒状内部空間５ｃ，６ｃ内における挿入部５Ａと被挿入部６Ａとの重なり部位に位置させているので、締結ボルト７Ａの長さを比較的短くすることが可能となる。よって、締結ボルト７Ａの先端が筒状内部空間５ｃ，６ｃの外部に突出することを良好に防止することができる。しかも、締結ボルト７Ａの雄ネジ部７ａが挿通孔６ｄに挿通された状態では、雄ネジ部７ａの外周面と挿通孔６ｄの内周面との間に所定の隙間が形成される。このため、両フランジ部１Ａ，１Ｂに剪断方向（径方向）への力が作用して、万が一、締結ボルト７Ａが径方向に若干変位した場合でも、締結ボルト７Ａの雄ネジ部７ａが挿通孔６ｄに当接することがなく、締結ボルト７Ａの伸びや破壊を防止することができる。 In the present embodiment, the female screw portion 5d is located at the overlapping portion of the insertion portion 5A and the insertion portion 6A in the cylindrical internal spaces 5c and 6c, so that the length of the fastening bolt 7A is relatively short. It becomes possible. Therefore, it is possible to favorably prevent the tip of the fastening bolt 7A from protruding to the outside of the cylindrical internal spaces 5c and 6c. Moreover, when the male screw portion 7a of the fastening bolt 7A is inserted into the insertion hole 6d, a predetermined gap is formed between the outer peripheral surface of the male screw portion 7a and the inner peripheral surface of the insertion hole 6d. Therefore, even if a force in the shearing direction (radial direction) acts on both flange portions 1A and 1B and the fastening bolt 7A is slightly displaced in the radial direction, the male screw portion 7a of the fastening bolt 7A is inserted into the insertion hole. It is possible to prevent the fastening bolt 7A from extending and breaking without coming into contact with the 6d.

図８に示すように、本実施形態では、脱落防止腕６Ｃの第一フランジ部１Ａの外側面１ａに対向する面が、第一押圧部６ｅよりも第一フランジ部１Ａの外側面１ａから離間する側に配置されているので、締結ボルト７Ａを締付けた場合でも、脱落防止腕６Ｃが第一フランジ部１Ａの外側面１ａに当接しない。その結果、脱落防止腕６Ｃに直接荷重が掛かることがなく、脱落防止腕６Ｃの破損を防止することができる。 As shown in FIG. 8, in the present embodiment, the surface of the fall prevention arm 6C that faces the outer surface 1a of the first flange portion 1A is separated from the outer surface 1a of the first flange portion 1A more than the first pressing portion 6e. Since it is arranged on the side where the fastening bolt 7A is tightened, the drop-out preventing arm 6C does not contact the outer surface 1a of the first flange portion 1A even when the fastening bolt 7A is tightened. As a result, the load is not directly applied to the fall-prevention arm 6C, and the fall-prevention arm 6C can be prevented from being damaged.

さらに、自重或いは地震等により、両フランジ部１Ａ，１Ｂに歪みや変形或いは相対的なずれ等が生じた場合でも、脱落防止腕６Ｃがナット４Ｂに確実に当接するので、補強治具Ｐが両フランジ部１Ａ，１Ｂから脱落することをより確実に防止することができる。また同様に、補強治具Ｐが両フランジ部１Ａ，１Ｂの周方向の何れの箇所に設けられた場合でも、補強治具Ｐが両フランジ部から下方側に脱落することを防止することができる。 Further, even when the flange portions 1A and 1B are distorted or deformed or are relatively displaced due to their own weight or an earthquake or the like, the fall prevention arm 6C surely abuts the nut 4B. It is possible to more reliably prevent the flanges 1A and 1B from falling off. Similarly, even when the reinforcing jig P is provided at any position in the circumferential direction of the flange portions 1A and 1B, it is possible to prevent the reinforcing jig P from falling off the flange portions downward. .

以下、別実施形態について、上述した実施形態と異なる構成のみ説明する。なお、図面の理解を容易にするため、同じ部材には同じ名称及び符号を用いて説明する。 Hereinafter, regarding another embodiment, only a configuration different from the above-described embodiment will be described. In order to facilitate understanding of the drawings, the same members will be described using the same names and reference numerals.

〔第一実施形態の第一変形例〕
上述した実施形態における脱落防止腕６Ｃの縁部６Ｃａには、第一フランジ部１Ａに向かって段落ちした段差部６Ｃｃを、第一挟持部材６の第一基部６Ｂから先端部６Ｃｂに亘って形成した。これに代えて、図１６に示すように、脱落防止腕６１Ｃの縁部６１Ｃａには、第一フランジ部１Ａに向かって段落ちした段差部６１Ｃｃを、ナット４Ｂの周りにのみ形成しても良い。この場合、脱落防止腕６Ｃのうち、第一挟持部材６の第一基部６Ｂから段差部６１Ｃｃが形成される部位まで厚みが確保されるので、脱落防止腕６Ｃの剛性を高めることができる。 [First Modification of First Embodiment]
In the edge portion 6Ca of the fall prevention arm 6C in the above-described embodiment, a step portion 6Cc that is stepped down toward the first flange portion 1A is formed from the first base portion 6B of the first holding member 6 to the tip portion 6Cb. did. Instead of this, as shown in FIG. 16, a stepped portion 61Cc that is stepped down toward the first flange portion 1A may be formed only on the periphery of the nut 4B at the edge portion 61Ca of the fall prevention arm 61C. . In this case, since the thickness of the fall prevention arm 6C is secured from the first base portion 6B of the first holding member 6 to the portion where the step portion 61Cc is formed, the rigidity of the fall prevention arm 6C can be increased.

〔第一実施形態の第二変形例〕
図１７に示すように、脱落防止腕６Ｃの段差部６Ｃｃに、第一挟持部材６の第一基部６Ｂから先端部６Ｃｂに亘って、第一フランジ部１Ａに向かうに連れて傾斜したテーパ面６Ｃｅが形成されていても良い。これによって、ナット４Ｂの締付工具をテーパ面６Ｃｅで案内することができるので、所望の締付トルクを得るための作業が極めて容易になる。なお、テーパ面６Ｃｅを段差部６Ｃｃの一部に形成して、テーパ面６Ｃｅ以外は階段状にしても良いし、上述した第一変形例のようにナット４Ｂの周りにのみ形成しても良く、特に限定されない。 [Second Modification of First Embodiment]
As shown in FIG. 17, on the stepped portion 6Cc of the cap 6C, the tapered surface 6Ce is inclined from the first base portion 6B of the first holding member 6 to the tip portion 6Cb toward the first flange portion 1A. May be formed. As a result, the tightening tool for the nut 4B can be guided by the tapered surface 6Ce, so that the work for obtaining the desired tightening torque becomes extremely easy. The tapered surface 6Ce may be formed in a part of the stepped portion 6Cc so as to have a stepped shape other than the tapered surface 6Ce, or may be formed only around the nut 4B as in the above-described first modification. It is not particularly limited.

〔第一実施形態の第三変形例〕
図１８に示すように、脱落防止腕６２Ｃの天面６２Ｃｄから縁部６２Ｃａに至るまでテーパ面６２Ｃｃを形成しても良い。この場合でも、ナット４Ｂの締付作業が容易なものとなる。なお、第一変形例と第三変形例とを組み合わせても良い。 [Third Modification of First Embodiment]
As shown in FIG. 18, a taper surface 62Cc may be formed from the top surface 62Cd of the fall prevention arm 62C to the edge portion 62Ca. Even in this case, the tightening work of the nut 4B becomes easy. The first modification and the third modification may be combined.

〔第一実施形態の第四変形例〕
図１９に示すように、脱落防止腕６３Ｃは、第一挟持部材６の第一基部６Ｂから脱落防止腕６３Ｃの先端部６３Ｃｂに向かうに連れて厚みが小さく設定されていても良い。この場合でも、脱落防止腕６３Ｃのうち、少なくともナット４Ｂに当接する縁部６３Ｃａの厚みが他の部位よりも小さく設定されている。このため、ナット４Ｂの締付作業の円滑化を図りつつ、脱落防止腕６３Ｃの支持部（第一基部６Ｂとの接続部）に十分な厚みを確保して剛性を高めることができる。しかも、第一基部６Ｂから先端部６３Ｃｂに向けて厚みを漸減させれば良いので、加工が容易である。なお、第一変形例、第二変形例又は第三変形例と、第四変形例とを組み合わせても良い。 [Fourth Modification of First Embodiment]
As shown in FIG. 19, the drop-out prevention arm 63C may be set to have a smaller thickness as it goes from the first base portion 6B of the first holding member 6 toward the tip end portion 63Cb of the drop-out prevention arm 63C. Even in this case, at least the edge portion 63Ca of the fall prevention arm 63C that is in contact with the nut 4B is set to have a smaller thickness than other portions. For this reason, while facilitating the tightening work of the nut 4B, it is possible to secure sufficient thickness in the support portion (the connection portion with the first base portion 6B) of the drop-out prevention arm 63C and increase the rigidity. Moreover, since the thickness may be gradually reduced from the first base portion 6B toward the tip portion 63Cb, the processing is easy. The first modified example, the second modified example, or the third modified example may be combined with the fourth modified example.

〔第二実施形態〕
上述した第一実施形態では、脱落防止腕６Ｃ，６１Ｃ，６２Ｃ，６３Ｃのうち、少なくともナット４Ｂに当接する縁部６Ｃａ，６１Ｃａ，６２Ｃａ，６３Ｃａの厚みが他の部位よりも小さく設定した。これに代えて、図２０〜図２１に示すように、ナット４Ｂが脱落防止腕６４Ｃよりも嵩高くなるよう、ナット４Ｂと第一フランジ部１Ａの外側面１ａとの間に肉厚座金４Ｃａ（高さ調整部材の一例）を挿入した接合部の補強構造を採用しても良い。この場合、脱落防止腕６４Ｃの縁部６４Ｃａの厚みを他の部位より小さくせずに、天面６４Ｃｄを縁部６４Ｃａに至るまで同一平面上で構成することが可能となる。 [Second embodiment]
In the above-described first embodiment, at least the edge portions 6Ca, 61Ca, 62Ca, 63Ca of the fall prevention arms 6C, 61C, 62C, 63C that come into contact with the nut 4B are set to have a smaller thickness than other portions. Instead of this, as shown in FIGS. 20 to 21, the thick washer 4Ca (between the nut 4B and the outer side surface 1a of the first flange portion 1A (so that the nut 4B is more bulky than the cap 64C). You may employ | adopt the reinforcement structure of the joining part which inserted the example of a height adjustment member. In this case, the top surface 64Cd can be formed on the same plane up to the edge portion 64Ca without making the thickness of the edge portion 64Ca of the drop-out prevention arm 64C smaller than that of other portions.

本実施形態の場合でも、ナット４Ｂの周りは、脱落防止腕６４Ｃの高さがナット４Ｂの高さより小さく設定されているので、ナット４Ｂの締付けを行う際、ナット４Ｂの周りに締付工具を確実に挿入することができる。しかも、脱落防止腕６４Ｃの縁部６４Ｃａが肉厚座金４Ｃａに面接触するので、脱落防止腕６４Ｃの姿勢が安定し易い。なお、肉厚座金４Ｃａは円環状の座金に限定されず、巻コイル状の座金や切り口のある皿ばね座金であっても良く、所望の締付トルクに耐え得る高さ調整部材であれば特に限定されない。 Even in the case of the present embodiment, the height of the fall prevention arm 64C is set to be smaller than the height of the nut 4B around the nut 4B. Therefore, when tightening the nut 4B, use a tightening tool around the nut 4B. It can be inserted securely. Moreover, since the edge 64Ca of the cap 64C comes into surface contact with the thick washer 4Ca, the posture of the cap 64C is easily stabilized. The thick washer 4Ca is not limited to an annular washer, and may be a coiled washer or a disc spring washer with a cut end. If the height adjusting member can withstand a desired tightening torque, it is particularly preferable. Not limited.

〔別実施形態１〕
上述した実施形態における第一挟持部材６、第二挟持部材５、及び締結機構７の構成は、適宜変更することができる。例えば、図２２〜図２３に示すように、第二挟持部材５０を、一対の脚部５０Ａ，５０Ｂを備えたコの字状部材により構成し、第一挟持部材６０を、脚部５０Ｂに形成された貫通雌ネジ孔５０ａに螺合される雄ネジ軸部７０ａを備えたボルトにより構成している。第一挟持部材６０となるボルトは、ボルトの頭部７０ｂと第二挟持部材５０とを、両フランジ部１Ａ，１Ｂの接合方向に近接させて固定する締結機構７０としても機能する。第一挟持部材６０は、第一フランジ部１Ａを押圧する第一押圧部６０ｅを有し、第二挟持部材５０は、脚部５０Ａの先端部に、第二フランジ部１Ｂの外側面１ａを押圧する第二押圧部５０ｅを有している。 [Other Embodiment 1]
The configurations of the first holding member 6, the second holding member 5, and the fastening mechanism 7 in the above-described embodiment can be appropriately changed. For example, as shown in FIGS. 22 to 23, the second holding member 50 is configured by a U-shaped member having a pair of legs 50A and 50B, and the first holding member 60 is formed on the leg 50B. It is configured by a bolt having a male screw shaft portion 70a screwed into the penetrating female screw hole 50a. The bolt serving as the first holding member 60 also functions as a fastening mechanism 70 that fixes the head portion 70b of the bolt and the second holding member 50 close to each other in the joining direction of the flange portions 1A and 1B. The first holding member 60 has a first pressing portion 60e that presses the first flange portion 1A, and the second holding member 50 presses the outer surface 1a of the second flange portion 1B against the tip portion of the leg portion 50A. The second pressing portion 50e is provided.

本実施形態においても、脱落防止腕６Ｃは、第一押圧部６０ｅの基部６０Ｂ（第一押圧部６０ｅを支持する基部６０Ｂ）の側面から延出形成されるＬ字状又はＣ字状部材に構成されている。この脱落防止腕６Ｃは、第一フランジ部１Ａに向かって段落ちした段差部６Ｃｃが、第一基部６Ｂと脱落防止腕６Ｃとの接続部から先端部６Ｃｂに亘って形成されている。なお、脱落防止腕６Ｃは第一実施形態と同様の構成を図示しているが、上述した変形例における脱落防止腕６１Ｃ，６２Ｃ，６３Ｃの構成や、第二実施形態における接合部の補強構造を採用しても良い。 Also in the present embodiment, the cap 6C is configured as an L-shaped or C-shaped member that is formed to extend from the side surface of the base 60B of the first pressing portion 60e (the base 60B that supports the first pressing portion 60e). Has been done. The step-preventing arm 6C has a stepped portion 6Cc that is stepped down toward the first flange portion 1A from the connecting portion between the first base portion 6B and the anti-dropping arm 6C to the tip portion 6Cb. Although the cap 6C is shown to have the same configuration as that of the first embodiment, the caps 6C, 62C, and 63C of the above-described modified examples and the reinforcing structure of the joint in the second embodiment are not shown. You may adopt it.

〔別実施形態２〕
図２４に示すように、第二挟持部材５１の挿入部５１Ａを第一挟持部材６１の被挿入部６１Ａに挿入可能な外径を備えた角棒状に構成し、第一挟持部材６１の被挿入部６１Ａを筒状に構成する。そして、挿入部５１Ａの先端側には、雄ネジ部５２ａを備えたボルト５２が接合方向に突出形成され、被挿入部６１Ａ内に挿入部５１Ａが相対回転不能に係合した状態で、締結ナット５３が被挿入部６１Ａの外方から外面側に当接するまで螺合される構成としてもよい。なお、本実施形態においても、上述した実施形態における脱落防止腕６Ｃ，６１Ｃ，６２Ｃ，６３Ｃの構成や、第二実施形態における接合部の補強構造が採用される。 [Second Embodiment]
As shown in FIG. 24, the insertion portion 51A of the second holding member 51 is formed into a square rod shape having an outer diameter that can be inserted into the insertion portion 61A of the first holding member 61, and the insertion portion of the first holding member 61 is inserted. The portion 61A has a cylindrical shape. Then, a bolt 52 having a male screw portion 52a is formed to project in the joining direction on the distal end side of the insertion portion 51A, and the fastening nut is engaged in the inserted portion 61A in a relatively non-rotatable manner. The configuration may be such that 53 is screwed from the outside of the inserted portion 61A until it abuts on the outer surface side. Note that, also in the present embodiment, the configuration of the fall prevention arms 6C, 61C, 62C, 63C in the above-described embodiments and the joint reinforcing structure in the second embodiment are adopted.

〔その他の実施形態〕
（Ａ）上記実施形態では、両フランジ部１Ａ，１Ｂを８対の連結ボルト４Ａ及びナット４Ｂにより連結する構成としたが、フランジ部１Ａ，１Ｂの呼び径や設計圧力等に応じて、連結ボルト４Ａ及びナット４Ｂの数は適宜調整することができる。 [Other Embodiments]
(A) In the above-described embodiment, the two flange portions 1A and 1B are connected by the eight pairs of connecting bolts 4A and nuts 4B. However, the connecting bolts may be connected depending on the nominal diameter of the flange portions 1A and 1B and the design pressure. The numbers of 4A and nuts 4B can be adjusted appropriately.

（Ｂ）補強治具Ｐの装着手順は適宜変更することができる。例えば、まず、第一挟持部材６の第一押圧部６ｅを第一フランジ部１Ａの外側面１ａに当接させ、脱落防止腕６Ｃを第一フランジ部１Ａの径方向内方側からナット４Ｂに当接又は近接させる。次いで、第二挟持部材５の挿入部５Ａを接合方向から被挿入部６Ａの内部に挿入させつつ、第二押圧部５ｅを第二フランジ部１Ｂの外側面１ａに当接させる。次いで、締結ボルト７Ａの雄ネジ部７ａを被挿入部６Ａの挿通孔６ｄを介して挿入部５Ａの雌ネジ部５ｄに螺合させ、両挟持部材６，５を両フランジ部１Ａ，１Ｂに装着することもできる。 (B) The mounting procedure of the reinforcing jig P can be changed appropriately. For example, first, the first pressing portion 6e of the first holding member 6 is brought into contact with the outer surface 1a of the first flange portion 1A, and the cap 6C is attached to the nut 4B from the radially inner side of the first flange portion 1A. Contact or approach. Next, the insertion portion 5A of the second holding member 5 is inserted into the insertion portion 6A from the joining direction, and the second pressing portion 5e is brought into contact with the outer side surface 1a of the second flange portion 1B. Next, the male screw portion 7a of the fastening bolt 7A is screwed into the female screw portion 5d of the insertion portion 5A through the insertion hole 6d of the inserted portion 6A, and both clamping members 6 and 5 are attached to both flange portions 1A and 1B. You can also do it.

（Ｃ）上記実施形態では、脱落防止腕６Ｃを第一挟持部材６にのみ設ける構成としたが、必要に応じて、第二挟持部材５又は両挟持部材６，５に設ける構成としても良い。また、脱落防止腕６Ｃを、連結ボルト４Ａの頭部４ａ又はナット４Ｂに対して、両フランジ部１Ａ，１Ｂの径方向内方側から径方向外方側に回り込む凹状に形成せずに、単に、両フランジ部１Ａ，１Ｂの径方向内方側から当接する棒状部材で構成しても良い。 (C) In the above embodiment, the cap 6C is provided only on the first holding member 6, but may be provided on the second holding member 5 or both holding members 6 and 5 as necessary. Further, the drop-out prevention arm 6C is not simply formed in a concave shape that wraps around the head portion 4a of the connecting bolt 4A or the nut 4B from the radially inner side of both flange portions 1A, 1B to the radially outer side, and simply Alternatively, a rod-shaped member that comes into contact with the flange portions 1A and 1B from the radially inner side may be used.

（Ｄ）上記実施形態では、第一挟持部材６に被挿入部６Ａを設け、第二挟持部材５に挿入部５Ａを設けるように構成したが、第二挟持部材５に被挿入部を設け、第一挟持部材６に挿入部を設ける構成としてもよい。 (D) In the above embodiment, the inserted portion 6A is provided in the first holding member 6 and the insertion portion 5A is provided in the second holding member 5, but the inserted portion is provided in the second holding member 5. The first holding member 6 may be provided with an insertion portion.

（Ｅ）上記実施形態では、第二挟持部材５の挿入部５Ａと第一挟持部材６の被挿入部６Ａとの形状を、正方形状としたが、接合方向周りでの相対回転が不能に構成されていれば、どのような形状であっても良い。例えば、横断面視で、挿入部５Ａの外面５ａ及び被挿入部６Ａの内面６ｂの形状を、楕円形状、多角形状等に構成することができる。 (E) In the above-described embodiment, the shape of the insertion portion 5A of the second holding member 5 and the insertion portion 6A of the first holding member 6 is a square shape, but relative rotation around the joining direction is impossible. Any shape may be used as long as it is provided. For example, the shape of the outer surface 5a of the insertion portion 5A and the inner surface 6b of the inserted portion 6A can be configured in an elliptical shape, a polygonal shape, or the like in a cross-sectional view.

（Ｆ）上記実施形態では、両フランジ部１Ａ，１Ｂを、いわゆるＲＦ形フランジとした構成について説明したが、フランジ接合であれば、その他のフランジ接合であってもよく、例えば、ガスケット用の溝部を設けた所謂ＧＦ形フランジとしてもよい。 (F) In the above-described embodiment, a configuration in which both flange portions 1A and 1B are so-called RF flanges has been described, but other flange joints may be used as long as they are flange joints, for example, a groove portion for a gasket. It may be a so-called GF type flange provided with.

（Ｇ）上記実施形態では、流体配管系（管路）を構成する流体管の一例である鋳鉄製の両水道管１，１に形成した両フランジ部１Ａ，１Ｂに補強治具Ｐを装着する例について説明したが、流体管としては気体や液体が通流する管であってもよい。 (G) In the above embodiment, the reinforcing jig P is attached to both flange portions 1A and 1B formed in both cast iron water pipes 1 and 1, which are an example of a fluid pipe that constitutes a fluid piping system (pipe line). Although an example has been described, the fluid pipe may be a pipe through which gas or liquid flows.

本発明に係る接合部の補強治具および補強構造は、配管どうし、流体機器どうし、又は流体機器と配管の接合部を補強するための治具として利用可能である。 INDUSTRIAL APPLICABILITY The joint jig and the reinforcing structure according to the present invention can be used as a jig for reinforcing pipes, fluid devices, or a joint between a fluid device and a pipe.

１水道管（第一筒状部材、第二筒状部材）
１Ａ第一フランジ部
１Ｂ第二フランジ部
１ａ外側面
４Ａ連結ボルト
４ａ頭部
４Ｂナット
４Ｃａ肉厚座金（高さ調整部材）
５ｅ第二押圧部
６ｅ第一押圧部
６Ｂ第一基部（基部）
６Ｃ脱落防止腕
６Ｃａ縁部
６Ｃｃ段差部
６Ｃｅテーパ面
６３Ｃｂ先端部
７締結機構
Ｐ補強治具 1 Water pipe (first tubular member, second tubular member)
1A 1st flange part 1B 2nd flange part 1a Outer side surface 4A Connecting bolt 4a Head part 4B Nut 4Ca Thick washer (height adjusting member)
5e 2nd press part 6e 1st press part 6B 1st base (base)
6C Fall prevention arm 6Ca Edge 6Cc Step 6Ce Tapered surface 63Cb Tip 7 Fastening mechanism P Reinforcing jig

Claims

Attached to a joint part where a first flange portion protruding radially outward from the end portion of the first cylindrical member and a second flange portion protruding radially outward from the end portion of the second cylindrical member are joined with a connecting bolt. Is
A first pressing portion that presses the outer surface in the joining direction of the first flange portion in which the head or nut of the connecting bolt is arranged,
A second pressing portion that presses the outer surface of the second flange portion,
A fastening mechanism that fixes the first pressing portion and the second pressing portion so as to be close to each other in the joining direction,
A drop-preventing arm extending from the base of the first pressing portion and coming into contact with the head or the nut from the inside toward the radial outside,
The fall-prevention arm is set so that at least the thickness of the edge portion abutting the head portion or the nut is set smaller than other portions so as to retract in the joining direction with respect to the head portion or the nut ,
A reinforcing jig for a joint portion, in which a step portion that is stepped down toward the first flange portion is formed at least around the head portion or the nut in the edge portion .

The reinforcing jig for a joint portion according to claim 1 , wherein the stepped portion has a tapered surface inclined toward the first flange portion.

  Reinforcing the joint portion where the first flange portion projecting radially outward from the end portion of the first tubular member and the second flange portion projecting radially outward from the end portion of the second tubular member are joined with a connecting bolt. A method of mounting a reinforcing jig for mounting a jig,
  The reinforcing jig is
    A first pressing portion that presses the outer surface in the joining direction of the first flange portion in which the head or nut of the connecting bolt is arranged,
    A second pressing portion that presses the outer surface of the second flange portion,
    A fastening mechanism that fixes the first pressing portion and the second pressing portion so as to be close to each other in the joining direction,
    A drop-preventing arm extending from the base of the first pressing portion and coming into contact with the head or the nut from the inside toward the radial outside,
    The fall-prevention arm is set so that at least the thickness of the edge portion abutting the head portion or the nut is set smaller than other portions so as to retract in the joining direction with respect to the head portion or the nut,
  The mounting method is
    A first fastening step of performing a fastening operation of the fastening mechanism in a state in which the drop-preventing arm is in contact with the head or the nut,
    A second fastening step of fastening the connecting bolt or the nut,
    A method for mounting a reinforcing jig, wherein the first fastening step and the second fastening step are alternately performed.

The method for mounting a reinforcing jig according to claim 3, wherein a stepped portion that is stepped down toward the first flange portion is formed on the edge portion.

The method for mounting a reinforcing jig according to claim 4, wherein the stepped portion has a tapered surface that is inclined toward the first flange portion.

The method for mounting a reinforcing jig according to claim 3, wherein the fall-off preventing arm is set to have a thickness that becomes smaller from the base portion toward the distal end portion.