JP2021175921A

JP2021175921A - Reinforcement jig attachment method

Info

Publication number: JP2021175921A
Application number: JP2021132167A
Authority: JP
Inventors: 信夫宗友; Nobuo Munetomo; 光信矢野; Mitsunobu Yano; 忍安井; Shinobu Yasui; 充弘森; Mitsuhiro Mori; 大介酒井; Daisuke Sakai
Original assignee: Taisei Kiko Co Ltd; Okayama City Office
Current assignee: Taisei Kiko Co Ltd; Okayama City Office
Priority date: 2020-03-18
Filing date: 2021-08-16
Publication date: 2021-11-04
Anticipated expiration: 2036-02-17
Also published as: JP7246440B2

Abstract

To provide a reinforcement jig attachment method which can attain desired fastening torque.SOLUTION: A reinforcement jig P includes: a first pressing part 6e which presses an outer surface 1a of a first flange part 1A in which a head of a connection bolt or a nut 4B is disposed; a second pressing part 5e which presses an outer surface 1a as seen in a joint direction of a second flange part 1B; and a fastening mechanism 7 which moves the first pressing part 6e and the second pressing part 5e close to each other in the joint direction to fix the pressing parts 6e and 5e. An attachment method of the reinforcement jig P includes: a first fastening step in which the fastening mechanism 7 is fastened; and a second fastening step in which the connection bolt or the nut 4B is fastened. The first fastening step is performed and then the second fastening step is performed.SELECTED DRAWING: Figure 6

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の装着方法に関する。 The present invention relates to a method of mounting a reinforcing jig for reinforcing a joint portion between flange portions protruding outward from the end portions of both tubular members.

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 reinforcing jig, for example, Patent Document 1 describes a pair of holding members having pressing portions that separately contact the pair of flange joints, and a fastening mechanism that pulls and fixes both holding members in the joining direction of the joints. A configuration with 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。 Further, one holding member is formed with a C-shaped dropout prevention arm that abuts from the inside toward the outer diameter to the head or nut of the connecting bolt connecting the two flange portions. The fall-out prevention arm prevents the reinforcing jig from falling off from both flange portions.

特開２０１４−１４１９９５号公報Japanese Unexamined Patent Publication No. 2014-141995

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、所望の締付トルクを満足させる必要がある。 For example, when reinforcing a flange joint such as a water pipe bridge exposed on the ground with a reinforcing jig, it is necessary to satisfy a desired tightening torque.

そこで、所望の締付トルクを得ることのできる補強治具の装着方法が望まれている。 Therefore, a method of mounting a reinforcing jig capable of obtaining a desired tightening torque is desired.

補強治具の装着方法の特徴構成は、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、を備え、前記装着方法は、前記第一押圧部が前記第一フランジ部の前記外側面に対向し、且つ、前記第二押圧部が前記第二フランジ部の前記外側面に対向するように、前記補強治具を前記接合部に設置し、前記締結機構を締め付けて前記補強治具を前記接合部に仮固定する設置工程と、前記設置工程の後、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、前記第一締結工程を実行した後、前記第二締結工程を実行する点にある。 Features of the method of mounting the reinforcing jig The configuration consists of a first flange portion protruding outward from the end of the first tubular member and a second flange portion protruding outward from the end of the second tubular member. It is a method of attaching a reinforcing jig to a joint portion formed by joining with a connecting bolt, wherein the reinforcing jig is a head of the connecting bolt or a first flange portion on which a nut is arranged. The first pressing portion that presses the outer surface in the joining direction, the second pressing portion that presses the outer surface of the second flange portion, and the first pressing portion and the second pressing portion are close to each other in the joining direction. In the mounting method, the first pressing portion faces the outer surface of the first flange portion, and the second pressing portion faces the outer surface of the first flange portion, and the second pressing portion is the second flange portion. An installation step of installing the reinforcing jig at the joint so as to face the outer side surface, tightening the fastening mechanism to temporarily fix the reinforcing jig to the joint, and fastening after the installation step. A point in which the first fastening step of tightening the mechanism and the second fastening step of tightening the connecting bolt or the nut are included, and the second fastening step is executed after the first fastening step is executed. 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、連結ボルト又はナッ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又はナットとの締付けを行うことで、所望の締付けトルクを得ることができる。 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 in the proximity direction to each other due to the tightening force of the fastening mechanism. As a result, the connecting bolts or nuts can be further tightened, and the tightening torque for the flange joint can be increased. A desired tightening torque can be obtained by tightening these fastening mechanisms with the connecting bolts or nuts.

他の特徴構成は、前記第一締結工程と前記第二締結工程とを交互に複数回実行する点にある。 Another characteristic configuration is that the first fastening step and the second fastening step are alternately executed a plurality of times.

本構成のように、締結機構と連結ボルト又はナットとの締付けを交互に行うことで、確実に所望の締付けトルクを得ることができる。 By alternately tightening the fastening mechanism and the connecting bolts or nuts as in this configuration, a desired tightening torque can be reliably obtained.

他の特徴構成は、前記第一押圧部及び前記第二押圧部の中心は、前記連結ボルトの前記頭部又は前記ナットの外形を前記第一筒状部材の周方向に延長させた仮想円環面の領域内に位置している点にある。 Another characteristic configuration is that the center of the first pressing portion and the second pressing portion is a virtual ring in which the outer shape of the head or the nut of the connecting bolt is extended in the circumferential direction of the first tubular member. It is at a point located within the area of the surface.

本構成のように、締結機構の締付けを行うことで、連結ボルトの頭部又はナットと両フランジ部との間に隙間を形成しやすく、連結ボルトの頭部又はナットが両フランジ部に対して片当たり状態となる不都合がない。このため、連結ボルト又はナットを締付けた際、両フランジ部を均一に近接移動させることができる。 By tightening the fastening mechanism as in this configuration, it is easy to form a gap between the head or nut of the connecting bolt and both flanges, and the head or nut of the connecting bolt is attached to both flanges. There is no inconvenience of being in a one-sided contact state. Therefore, when the connecting bolts or nuts are tightened, both flange portions can be uniformly moved in close proximity.

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 tubular members. 両筒状部材の縦断面図である。It is a vertical cross-sectional view of both cylindrical 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 the schematic structure of the 1st holding 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 the schematic structure of the 2nd holding 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 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 reinforcing 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 reinforcing jig which concerns on 1st 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 reinforcing jig which concerns on 1st 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 reinforcing jig which concerns on 1st 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 reinforcing jig which concerns on 1st 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 which shows the 4th modification of 1st 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 which shows the mounting state of the reinforcing jig which concerns on 2nd 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 enlarged side view which shows the mounting state of the reinforcing 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 reinforcing jig which concerns on another Embodiment 1. FIG. 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 vertical cross-sectional view which shows the mounting state of the reinforcing jig which concerns on another Embodiment 1. FIG. 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 vertical 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, embodiments of the joint reinforcing jig P 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 (an example of the first tubular member and the second tubular member) projecting outward in the radial direction 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 gist thereof.

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 flange joints in the middle of the fluid piping system (pipeline). Both flange portions 1A and 1B formed in a disk shape in the outward diameter direction from the ends of both cast iron water pipes 1 and 1, which are examples of fluid pipes, form a plurality of connecting bolts 4A and nuts 4B ( In this embodiment, they are connected by 8 places). In the present embodiment, the side where the nut 4B is located is the first flange portion 1A, and the side where the head portion 4a of the connecting bolt 4A is located is the second flange portion 1B. Washers 4C and 4C are 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, respectively. In this way, the connecting bolt 4A, the nut 4B, and the washers 4C and 4C form a connecting mechanism for connecting the flange portions 1A and 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 two flange portions 1A and 1B. In both flange portions 1A and 1B, a plurality of through holes 3 (8 locations each in the present embodiment) penetrating in the flange joining direction (axial direction, hereinafter referred to as "joining direction") are equidistant in the circumferential direction. The connecting bolt 4A is inserted into 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. The flange portions 1A and 1B of the present embodiment are so-called RF type flanges provided with a flat seating 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。 In the following, in both flange portions 1A and 1B, the surfaces on the side where the water pipe 1 protrudes are referred to as outer surfaces 1a and 1a in the joining direction, respectively. Further, the surfaces of both flanges 1A and 1B on the outer side in the radial direction 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 for pressing the outer surface 1a of the first flange portion 1A, and a second flange portion 1B. A second holding member 5 having a second pressing portion 5e for pressing the outer surface 1a of the above is provided. For example, fine irregularities may be formed on the pressing portions 6e and 5e, or a rubber member may be attached to the surfaces of the pressing portions 6e and 5e on the outer surfaces 1a and 1a of the flange portions 1A and 1B. On the other hand, friction processing is performed so that frictional resistance is generated. It is not necessary to perform friction processing on both pressing portions 6e and 5e, 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 and 5e abutting against the outer surfaces 1a and 1a of both flange portions 1A and 1B, both holding members 6 and 5 (both pressing portions 6e and 5e) are pulled in the joining direction (both pressing portions 6e and 5e). It is provided with a fastening mechanism 7 for fixing (closely).

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 sandwiching member 6 is composed of a metal member, and has an inserted portion 6A having an outer surface 6a and an inner surface 6b formed in a quadrangular bottomed square cylinder in a cross-sectional view, and an inserted portion 6A to be inserted. A first base portion 6B (an example of a base portion) having a first pressing portion 6e extending outward from one of the four sides of the outer surface 6a of the inserted portion 6A at one end of the portion 6A, and a first base portion 6B. It is integrally provided with a fall-out prevention arm 6C extending from the side surface. The fall-out prevention arm 6C may be formed so as to extend from the tip surface of the first base portion 6B, or the fall-off prevention arm 6C may be separately manufactured and joined to the first base portion 6B, and is not particularly limited.

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 is a cylindrical interior that receives the insertion portion 5A of the second sandwiching member 5 along the joining direction. Space 6c is formed. That is, as shown in FIG. 6, when the reinforcing jig P is mounted on both the flange portions 1A and 1B, the second holding member described later is located at a position radially outside the outer peripheral surface 1c of the first flange portion 1A. An insertion portion 5A is formed in 5, and an insertion portion 6A that receives the insertion portion 5A inside is formed in the first holding member 6 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 tubular internal space 6c is formed in a square shape in a cross-sectional view, and is formed slightly larger than the square-shaped insertion portion 5A in a cross-sectional view. Therefore, the shape perpendicular to the joining direction between the outer surface 5a of the insertion portion 5A and the inner surface 6b of the inserted portion 6A is such that when the insertion portion 5A is inserted into the tubular internal space 6c of the insertion portion 6A, the insertion direction (cylindrical shape). It is slidable in the longitudinal direction of the internal space 6c), but is formed so as to be unable to rotate relative to 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 tubular internal space 6c, an opening is formed on the side opposite to the side where the first base portion 6B is formed, and the male screw portion 7a of the fastening bolt 7A can be inserted on the side where the first base portion 6B is formed. Further, an insertion hole 6d, which cannot be inserted through the head portion 7b, is formed as an opening so as to penetrate the bottom portion of the inserted portion 6A (see the cross-sectional view of 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 constricted 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 tip side in a vertical cross-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 the first pressing portion 6e 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-out prevention arm 6C is an L-shaped or C-shaped member extending from the side surface of the first base portion 6B (see the plan view of FIG. 4 and the perspective view of FIG. 4), and is a nut screwed into the connecting bolt 4A. It is formed to have a diameter larger than the outer circumference of the nut 4B so that at least a part of the 4B can be surrounded. When the reinforcing jig P is attached to both flange portions 1A and 1B, the fall-out prevention arm 6C comes into contact with the nut 4B from the inside toward the outer diameter (see FIG. 6). Further, in a vertical cross-sectional view, of the surfaces constituting the fall-out prevention arm 6C, the surface of the tubular internal space 6c opposite to the insertion hole 6d in the longitudinal direction has a gap with respect to the first flange portion 1A at the time of mounting. It is retired from the insertion hole 6d side of the first pressing portion 6e so as to have it (see the cross-sectional view of FIG. 4). The first holding member 6 and the second holding member 5 may be mounted in opposite directions so that the fall prevention arm 6C is brought into contact with the head portion 4a of the connecting bolt 4A, and the present invention 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 fall-out prevention arm 6C has at least a thickness of the edge portion 6Ca that abuts on the nut 4B so as to retreat 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 fall prevention arm 6C in the present embodiment, the step portion 6Cc stepped down toward the first flange portion 1A is transferred from the connection portion between the first base portion 6B and the fall prevention arm 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 as to retire toward the first flange portion 1A from the top surface 6Cd of the fall prevention arm 6C. The notch of the edge portion 6Ca is set to a size that allows a tightening tool (not shown) such as a ratchet or spanner for tightening the nut 4B to be inserted. If such a stepped portion 6Cc (notch) is formed, a concave gap is formed between the side surface of the nut 4B and the side wall of the stepped portion 6Cc, so that the tightening tool can be easily inserted and the tightening tool can be used. The tip can be easily hooked 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。 Further, 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 portion 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 portion 6Ca may be brought into surface contact with the washer 4C, and the present invention is not particularly limited. Further, the nut 4B may be formed in a polygonal shape other than a hexagon, or 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 flange portions 1A and 1B are distorted, deformed, or relatively displaced due to their own weight or an earthquake, the fall-out prevention arm 6C surely comes into contact with the nut 4B, so that the reinforcing jig P can be used. It is possible to more reliably prevent the flange portions 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 sandwiching member 5 is made of a metal material, and the insertion portion 5A is formed in a bottomed square tube shape in which the outer surface 5a is rectangular and the inner peripheral surface 5b is circular in cross-sectional view. And, at one end of the insertion portion 5A, the collar-shaped portion 5B extending outward from the outer surface 5a of the insertion portion 5A over the entire circumference, and the flange-shaped portion 5B further outward from one of the four sides of the flange-shaped portion 5B. It is configured to integrally include a second base portion 5C that extends.

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 the perspective view of FIG. 5), and inside the insertion portion 5A, a cylindrical shape through which the male screw portion 7a of the fastening bolt 7A of the fastening mechanism 7 described later can be inserted. A tubular internal space 5c is formed. The inner diameter of the tubular internal 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 brim-shaped portion 5B is formed in a square shape in a side view, and a cylindrical internal space 5c is formed through the central portion (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, the side on which the flange-shaped portion 5B and the second base portion 5C are formed is formed with an opening, and the side opposite to the side on which the flange-shaped portion 5B and the second base portion 5C are formed is the fastening bolt 7A. A female screw portion 5d into which the male screw portion 7a can be screwed is formed as an opening 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 tubular internal space 5c in the insertion portion 5A at an end portion opposite to the side on which the flange-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 constricted shape in a side view (see the plan view of FIG. 5), and is formed in a tapered shape that inclines toward the female screw portion 5d toward the tip side in a vertical cross-sectional view. (See FIG. 5 cross-sectional view). Further, the tip portion of the surface of the second base portion 5C on the side of the female screw portion 5d 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 inserted into the cylindrical 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. It is composed of a female screw portion 5d formed on the 5b and a washer 7B interposed between the fastening bolt 7A and the flange-shaped portion 5B. The washer 7B between the fastening bolt 7A and the flange 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 views of the reinforcing jig P described above are shown in FIGS. 10 to 15. In the six-sided view of the reinforcing jig P, the insertion portion 5A of the second sandwiching member 5 is inserted into the inserted portion 6A of the first sandwiching member 6 without passing through the joint portion of both 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-out 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. be. The fall-out prevention arm 6C abuts on the head portion 4a of the connecting bolt 4A of both flange portions 1A and 1B or the nut 4B screwed to the connecting bolt 4A to prevent the reinforcing jig P from falling off. The dropout prevention arm 6C in the present embodiment may be changed to the dropout prevention arms 61C, 62C, 63C of the modified example described later. In this case, since it is a six-view drawing in which only the shape of the fall-out prevention arm 6C is changed, a detailed drawing is 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 a 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 existing bolt and nut (not shown) of both flange portions 1A and 1B are removed and replaced with connecting bolts 4A and nuts 4B. Sequentially perform this replacement for all existing bolts and nuts. At this time, in the present embodiment, since the fall-out prevention arm 6C has a thin edge portion 6Ca as an insertion space for the tightening tool, the connecting bolt 4A and the nut 4B are composed of the bolt corresponding to the high nut and the high nut. You don't have to. As a result, ordinary bolts and nuts can be used, so that the equipment cost can be saved.

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 sandwiching member 5 is inserted into the first sandwiching member 6 at a position on the outer side in the radial direction with respect to the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B. It is inserted into the tubular internal space 6c of the insertion portion 6A from the joining direction. At that time, since the outer surface 5a of the insertion portion 5A and the inner surface 6b of the inserted portion 6A are formed in a square shape that cannot be relatively rotated in the cross-sectional view, the first pressing portion 6e and the second pressing portion 6e of the first holding member 6 are formed. It can be easily inserted in a state where the second pressing portion 5e of the holding member 5 is positioned in the desired relative positional relationship extending 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 into the cylindrical internal space 6c from the outside of the inserted portion 6A in the joining direction 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 from the 5e is 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 overlapping portion between the inserted portion 6A and the inserting portion 5A in the joining direction and the distance between the first pressing portion 6e and the second pressing portion 5e can be appropriately set. .. Therefore, even if the wall thickness is changed according to the nominal diameters and design pressures of both flange portions 1A and 1B, the first sandwiching member 6 and the second sandwiching member 5 can be formed by adjusting the size of the overlapping portion. 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 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 contact with at least one of the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B from the outside diameter direction. Further, the fall prevention arm 6C of the first holding member 6 is brought into contact with or close to the nut 4B from the inside in the outer diameter direction (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 fall prevention arm 6C is set in the same direction as the direction in which the first holding member 6 provided with the fall prevention arm 6C rotates together when the fastening bolt 7A is rotated to the tightening side. There is. That is, the fall-out prevention arm 6C is centered on the insertion hole 6d from the side surface of the first base portion 6B of the first holding member 6 in the tightening direction of the fastening bolt 7A (in this embodiment, since the fastening bolt 7A is a right-handed screw). It is formed so as to extend in the clockwise direction). Therefore, when the fastening bolt 7A is tightened, the fall-out prevention arm 6C comes into contact with the nut 4B to provide rotational 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。 If there is no space for inserting 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-out prevention arm 6C abuts or approaches the head portion 4a of the connecting bolt 4A located in the second flange portion 1B from the inside in the outer diameter 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 surface 1a of the first flange portion 1A, and the second pressing portion 5e of the second holding member 5 presses the outer surface 1a of the second flange portion 1B. The fastening bolt 7A is tightened until the insertion portion 5A and the insertion portion 6A are pulled in the joining direction. As a result, the reinforcing jig P rotates clockwise together, and the fall prevention arm 6C and the nut 4B are surely in 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 on the other nuts 4B in both flange portions 1A and 1B from the outer diameter direction. In the present embodiment, the nuts 4B to be mounted by the reinforcing jig P are mounted at a total of 6 locations in which a set of 3 locations is symmetrical with respect to the center of the first flange portion 1A out of 8 locations. If necessary, the reinforcing jig P may be attached to all the nuts 4B, or may be attached only to a part of the adjacent portions of the nuts 4B.

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（第一締結工程）。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 re-tighten the fastening mechanism 7 of all the reinforcing jigs P (first fastening step). At this time, since the fastening bolt 7A is located at a position radially outside the flange portions 1A and 1B, the tightening operation is easy. Moreover, since the fall-out 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 holding members 6 and 5 move in close proximity to 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 in a direction close to each other due to 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 flange portions 1A and 1B, the center of the first pressing portion 6e and the second pressing portion 5e is a virtual ring surface in which the outer shape of the nut 4B is extended in the circumferential direction. Will be located within the area of. Therefore, when the first pressing portion 6e and the second pressing portion 5e move close to each other, a certain gap is likely to be formed between the nut 4B and the first flange portion 1A, and the nut 4B is moved to the first flange portion 1A. However, there is no inconvenience of being in a one-sided contact state. Therefore, when the nut 4B is tightened, both flange portions 1A and 1B move uniformly in close proximity 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（第二締結工程）。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。 Next, all the nuts 4B that join the flange portions 1A and 1B are tightened by using a tightening tool such as a ratchet or a spanner (second fastening step). At this time, the connecting bolt 4A is fixed by 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 step portion 6Cc stepped down toward the first flange portion 1A so that the edge portion 6Ca of the fall prevention arm 6C retires from the nut 4B in the joining direction is formed from the first base portion 6B to the tip portion. It is formed over 6 Cb (see FIG. 8). That is, around the nut 4B, the height of the fall prevention arm 6C is set to be 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。 Next, the fastening bolts 7A and the nuts 4B are alternately tightened until the tightening torques of the connecting bolts 4A, the nuts 4B and the fastening bolts 7A reach a predetermined reference value (for example, 90 Nm at a nominal diameter of 250 mm). .. As a result, the joint strength of both flange portions 1A and 1B by the reinforcing jig P can be further improved, and the separation and displacement of both flange portions 1A and 1B and the leakage of clean water due to these can be prevented more reliably. , It is also possible to improve the seismic performance of the pipeline.

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, the insertion portion 5A and the inserted portion 6A have an overlapping portion. Therefore, when a shearing force that shifts the positions of the flange portions 1A and 1B in the radial direction acts, or a tensile force that pulls the flange portions 1A and 1B apart in the axial direction acts, both holding members 6 and 5 are pressed. Even when the portions 6e and 5e receive a force in the opening direction, the stress applied to the fastening portion of the fastening mechanism 7 can be reduced.

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, since the female screw portion 5d is located at the overlapping portion between the insertion portion 5A and the inserted portion 6A in the tubular internal spaces 5c and 6c, the length of the fastening bolt 7A is relatively shortened. It becomes possible. Therefore, it is possible to satisfactorily 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 acts on both flange portions 1A and 1B in the shearing direction (diametrical direction) 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 stretching or breaking without coming into contact with 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 facing the outer surface 1a of the first flange portion 1A is separated from the outer surface 1a of the first flange portion 1A by the first pressing portion 6e. Since it is arranged on the side to be fastened, the fall prevention arm 6C does not come into contact with the outer surface 1a of the first flange portion 1A even when the fastening bolt 7A is tightened. As a result, no load is directly applied to the fall prevention arm 6C, and damage to the fall prevention arm 6C can be prevented.

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 if the flange portions 1A and 1B are distorted, deformed, or relatively displaced due to their own weight or an earthquake, the falling-out prevention arm 6C surely contacts the nut 4B, so that the reinforcing jigs P are both. It is possible to more reliably prevent the flange portions 1A and 1B from falling off. Similarly, when the reinforcing jig P is provided at any position in the circumferential direction of both flange portions 1A and 1B, it is possible to prevent the reinforcing jig P from falling off from both 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, only the configuration different from the above-described embodiment will be described with respect to another embodiment. In addition, 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 Modified Example of First Embodiment]
On the edge portion 6Ca of the fall-out prevention arm 6C in the above-described embodiment, a step portion 6Cc 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. bottom. Instead, as shown in FIG. 16, a stepped portion 61Cc stepped down toward the first flange portion 1A may be formed only around the nut 4B on the edge portion 61Ca of the fall prevention arm 61C. .. In this case, since the thickness of the fall-out 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-out 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 the first embodiment]
As shown in FIG. 17, a tapered surface 6Ce that is inclined toward the first flange portion 1A from the first base portion 6B to the tip portion 6Cb of the first sandwiching member 6 on the stepped portion 6Cc of the fall prevention arm 6C. May be formed. As a result, the tightening tool of the nut 4B can be guided by the tapered surface 6Ce, so that the work for obtaining a desired tightening torque becomes extremely easy. The tapered surface 6Ce may be formed in a part of the stepped portion 6Cc so that the tapered surface 6Ce may be stepped except for the tapered surface 6Ce, or may be formed only around the nut 4B as in the first modification described above. , 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 variant of the first embodiment]
As shown in FIG. 18, a tapered 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 nut 4B can be easily tightened. 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 variant of the first embodiment]
As shown in FIG. 19, the fall-out prevention arm 63C may be set to have a smaller thickness from the first base portion 6B of the first holding member 6 toward the tip end portion 63Cb of the fall-out prevention arm 63C. Even in this case, the thickness of at least the edge portion 63Ca in contact with the nut 4B of the fall-out prevention arm 63C is set to be smaller than that of the other portions. Therefore, while facilitating the tightening work of the nut 4B, it is possible to secure a sufficient thickness in the support portion (connecting portion with the first base portion 6B) of the fall prevention arm 63C to increase the rigidity. Moreover, since the thickness may be gradually reduced from the first base portion 6B toward the tip portion 63Cb, 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 first embodiment described above, among the fall prevention arms 6C, 61C, 62C, 63C, the thickness of at least the edge portions 6Ca, 61Ca, 62Ca, 63Ca that abut the nut 4B is set to be smaller than the other portions. Instead, as shown in FIGS. 20 to 21, a thick washer 4Ca (thick washer 4Ca) is provided between the nut 4B and the outer surface 1a of the first flange portion 1A so that the nut 4B is bulkier than the fall prevention arm 64C. An example of a height adjusting member) may be inserted to reinforce the joint. In this case, the top surface 64Cd can be formed on the same plane up to the edge 64Ca without making the thickness of the edge 64Ca of the fall prevention arm 64C smaller than that of other parts.

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 this embodiment, since the height of the fall prevention arm 64C is set to be smaller than the height of the nut 4B around the nut 4B, when tightening the nut 4B, a tightening tool is placed around the nut 4B. It can be inserted securely. Moreover, since the edge portion 64Ca of the fall prevention arm 64C comes into surface contact with the thick washer 4Ca, the posture of the fall prevention arm 64C is easy to stabilize. The thick washer 4Ca is not limited to an annular washer, and may be a wound coil-shaped washer or a disc spring washer with a cut end, and is particularly a height adjusting member that can withstand a desired tightening torque. 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。 [Another Embodiment 1]
The configurations of the first sandwiching member 6, the second sandwiching 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 sandwiching member 50 is composed of a U-shaped member having a pair of leg portions 50A and 50B, and the first sandwiching member 60 is formed on the leg portion 50B. It is composed of a bolt provided with a male screw shaft portion 70a screwed into the through female screw hole 50a. The bolt serving as the first holding member 60 also functions as a fastening mechanism 70 for fixing the head portion 70b of the bolt and the second holding member 50 so as to be close to each other in the joining direction of both 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. It has a second pressing portion 50e to be used.

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 this embodiment, the dropout prevention arm 6C is formed of an L-shaped or C-shaped member extending from the side surface of the base portion 60B of the first pressing portion 60e (base portion 60B supporting the first pressing portion 60e). Has been done. In this fall prevention arm 6C, a step portion 6Cc stepped down toward the first flange portion 1A is formed from a connection portion between the first base portion 6B and the fall prevention arm 6C to a tip portion 6Cb. The fall-out prevention arm 6C has the same configuration as that of the first embodiment, but the configuration of the fall-out prevention arms 61C, 62C, 63C in the above-described modified example and the reinforcing structure of the joint portion in the second embodiment are 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。 [Separate Embodiment 2]
As shown in FIG. 24, the insertion portion 51A of the second sandwiching member 51 is formed in a square bar shape having an outer diameter that can be inserted into the inserted portion 61A of the first sandwiching member 61, and the first sandwiching member 61 is inserted. The portion 61A is formed in a tubular shape. A bolt 52 having a male screw portion 52a is formed so as to project in the joining direction on the tip end side of the insertion portion 51A, and the fastening nut is engaged with the insertion portion 51A in the inserted portion 61A so as not to rotate relative to each other. The structure may be such that the 53 is screwed from the outside of the inserted portion 61A until it comes into contact with the outer surface side. Also in this embodiment, the configuration of the dropout prevention arms 6C, 61C, 62C, 63C in the above-described embodiment and the reinforcing structure of the joint portion 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 embodiment, both flange portions 1A and 1B are connected by eight pairs of connecting bolts 4A and nuts 4B, but the connecting bolts are connected according to the nominal diameter of the flange portions 1A and 1B, the design pressure, and the like. The number of 4A and 4B nuts can be adjusted as appropriate.

（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 as appropriate. 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 fall prevention arm 6C is attached to the nut 4B from the radial inner side of the first flange portion 1A. Abut or approach. Next, the second pressing portion 5e is brought into contact with the outer surface 1a of the second flange portion 1B while inserting the inserting portion 5A of the second holding member 5 into the inside of the inserted portion 6A from the joining direction. 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 insertion portion 6A, and both holding 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 fall-out prevention arm 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, if necessary. Further, the fall-out prevention arm 6C is not formed in a concave shape that wraps around the head portion 4a or the nut 4B of the connecting bolt 4A from the radial inner side to the radial outer side of both flange portions 1A and 1B, but simply. , Both flange portions 1A and 1B may be composed of rod-shaped members that come into contact with each other from the inner side in the radial direction.

（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 first sandwiching member 6 is provided with the inserted portion 6A, and the second sandwiching member 5 is provided with the inserting portion 5A. However, the second sandwiching member 5 is provided with the inserted portion. The first sandwiching 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 embodiment, the shape of the insertion portion 5A of the second sandwiching member 5 and the inserted portion 6A of the first sandwiching member 6 is square, but the relative rotation around the joining direction is impossible. Any shape may be used as long as it is provided. For example, in a cross-sectional view, the outer surface 5a of the insertion portion 5A and the inner surface 6b of the inserted portion 6A can be formed into an elliptical shape, a polygonal shape, or the like.

（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 embodiment, the configuration in which both flange portions 1A and 1B are so-called RF type flanges has been described, but other flange joints may be used as long as they are flange joints, for example, groove portions for gaskets. 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, 1 which are examples of the fluid pipes constituting the fluid piping system (pipeline). Although an example has been described, the fluid pipe may be a pipe through which a 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。 The reinforcing jig and reinforcing structure of the joint portion 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 cylindrical member, second tubular member)
1A 1st flange 1B 2nd flange 1a Outer side surface 4A Connecting bolt 4a Head 4B Nut 4Ca Thick washer (height adjustment member)
5e Second pressing part 6e First pressing part 6B First base (base)
6C Fall-off prevention arm 6Ca Edge 6Cc Step 6C Tapered surface 63Cb Tip 7 Fastening mechanism P Reinforcing jig

Claims

Reinforced the joint where the first flange protruding outward from the end of the first tubular member and the second flange protruding outward from the end of the second tubular member are joined with connecting bolts. It is a method of attaching a reinforcing jig to attach a jig.
The reinforcing jig is
A first pressing portion that presses the outer surface of the first flange portion in which the head or nut of the connecting bolt is arranged in the joining direction, and the first pressing portion.
A second pressing portion that presses the outer surface of the second flange portion, and a second pressing portion.
A fastening mechanism for fixing the first pressing portion and the second pressing portion in close proximity to each other in the joining direction is provided.
The mounting method is
The reinforcing jig is joined to the joint portion so that the first pressing portion faces the outer surface of the first flange portion and the second pressing portion faces the outer surface of the second flange portion. And the installation process of tightening the fastening mechanism and temporarily fixing the reinforcing jig to the joint.
After the installation step, the first fastening step of tightening the fastening mechanism and
Including the second fastening step of tightening the connecting bolt or the nut.
A method of mounting a reinforcing jig for executing the second fastening step after executing the first fastening step.

The method for mounting a reinforcing jig according to claim 1, wherein the first fastening step and the second fastening step are alternately executed a plurality of times.

The center of the first pressing portion and the second pressing portion is located in a region of a virtual ring surface in which the outer shape of the head or the nut of the connecting bolt is extended in the circumferential direction of the first tubular member. The method of mounting the reinforcing jig according to claim 1 or 2.