JP2015137683A - Flange connection part reinforcing structure and annular protection member used in reinforcing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange connection part reinforcing structure and an annular protection member in which a displacement or removal of a pair of holding members can be prevented, and outer surfaces of a pair of flange portions can be protected while earthquake resistance performance is being kept.SOLUTION: This invention relates to a flange connection part reinforcing structure M in which a plurality of reinforcing jigs P comprising holding members 5, 6 having pressing parts 5C, 6B capable of pressing an outer surface 1a of each of flanges 1A, 1B connected by a bolt 4A and a nut 4B, respectively, and fastening means 7 for use in fastening and fixing under pressed state are installed. A flat plate-like annular protection member R is installed in at least one of between an outer surface 1a of the flange 1A and a pressing part 5C and between an outer surface 1a of the flange 1B and a pressing part 6B. The member R is provided with an opening part 8 capable of inserting a head part of the bolt 4A or the nut 4B under installed state, a pressed part 9 pressed by a pressing part 5C or 6B at a surface Rf opposite to a surface Rr opposing to each of the outer surfaces 1a, and a stepped part 9a protruded at a radial outer location of the pressed part 9 from the pressed part 9 toward a flange connecting direction.

Description

  The present invention includes a pair of clamping members having pressing portions capable of pressing the outer surfaces of a pair of flange portions clamped and connected by a plurality of connection bolts and connection nuts arranged in the circumferential direction, and a pair of clamping members A flange joint reinforcement jig comprising fastening means for pulling and fixing in the flange joining direction in a state where the pressing parts are pressed against the outer surfaces of the pair of flange parts separately. The present invention relates to a plurality of flange joint reinforcement structures to be mounted, and an annular protective member used in the flange joint reinforcement structure.

  As such a flange joint portion reinforcing jig, for example, in Patent Document 1, a pair of sandwiching members are formed at positions opposite to each other in the flange joint direction at positions radially outward from the outer peripheral surfaces of the pair of flange portions. A pair of bolt screw holes (an example of a fastening means) are formed, and a pressing portion formed at a radially inner side position than the bolt screw hole in the pair of clamping members is provided on the outer surface of the pair of flange portions. The structure which screwed both screw bolts (an example of a fastening means) over a pair of bolt screwing hole in the state applied separately is disclosed. And the flange joint part reinforcement structure of the structure with which the said flange joint part reinforcement jig | tool was mounted | worn with two or more by a pair of flange part is disclosed.

  As such a flange joint reinforcing jig, for example, in Patent Document 2, one of a pair of sandwiching members is formed of a substantially U-shaped member having a pair of legs, and the other of the pair of sandwiching members is a pair. Of the other leg portion of the other end of the bolt that is screwed and attached to one of the leg portions (an example of a fastening means) The structure by which the inner peripheral surface was made into the press part which presses separately the outer surface of a pair of flange part is disclosed. As a result, the bolt is screwed into one leg portion and further tightened, whereby the tip end of the bolt and the inner peripheral surface of the other leg portion are brought into contact with the outer surface of the flange portion separately, and a pair of clamping members The pair of flange portions are clamped and fixed in the flange joining direction by a U-shaped member and a bolt. And the flange joint part reinforcement structure of the structure with which the said flange joint part reinforcement jig | tool was mounted | worn with two or more by a pair of flange part is disclosed.

  In these flange joint reinforcement structures, a pair of clamping members are fastened and fixed by fastening means, so that in addition to the joint strength of a pair of flange parts by a plurality of connecting bolts and connecting nuts in the circumferential direction, the fastening strength by the fastening means Even when a force is applied to the pair of flange portions in the bending direction or the pulling direction, the pair of flange portions can be prevented from separating and airtightness can be maintained.

Japanese Patent No. 4157413 Japanese Patent No. 4363565

Here, since the pair of flange portions are normally formed integrally with a fluid pipe made of a metal member such as cast iron, the pressing portions of the pair of clamping members are individually applied to the outer surfaces of the pair of flange portions. If the pair of clamping members are tightened and fixed by the fastening means, there is a possibility that corrosion such as rust may occur due to scratches on these outer surfaces, and there is room for improvement from the viewpoint of improving the durability of the fluid pipe and the pair of flange portions. There is.
Further, even when a force in the bending direction or the pulling direction of the fluid pipe is applied to the pair of sandwiching members or the pair of flange portions due to an earthquake or uneven settlement, the pair of sandwiching members are displaced or detached, and further, the pair of flanges It is desired that the separation of the parts can be prevented well, the seismic performance can be maintained, and the leakage of the fluid flowing through the fluid pipe can be surely prevented.

  When focusing on these points, the flange joint portion reinforcing structure disclosed in Patent Document 1 is configured such that the pressing portions of the pair of clamping members are directly applied to the outer surfaces of the pair of flange portions. In the flange joint portion reinforcing structure disclosed in FIG. 1, the bolt is screwed to one leg portion of the U-shaped member from the outer side in the tube axis direction, and the tip of the bolt is directly applied to the outer surface of the flange portion. Therefore, the outer surface may be scratched and cause corrosion and the like, and the durability of the fluid pipe and the pair of flange portions may be reduced.

  Further, in the flange joint portion reinforcing structure disclosed in Patent Documents 1 and 2, when a force in a bending direction or a tensile direction acts on the pair of sandwiching members or the pair of flange portions, the pair of sandwiching members and the pair of sandwiching members There is a possibility that the flange portion moves relative to each other, and the pair of clamping members are displaced from the intended mounting positions or detached from the outer surfaces of the pair of flange portions. In such a case, the desired seismic performance cannot be maintained, and the pair of flange portions may be separated and fluid may leak.

  The present invention has been made in view of such circumstances, and its purpose is to protect the outer surfaces of the pair of flange portions while maintaining the seismic performance by preventing the pair of sandwiching members from being displaced and detached. An object of the present invention is to provide a flange joint reinforcement structure capable of improving the performance, and an annular protective member used in the flange joint reinforcement structure.

In order to achieve the above object, the flange joint portion reinforcing structure according to the present invention is capable of separately pressing the outer surfaces of a pair of flange portions tightened and connected by a plurality of connecting bolts and connecting nuts arranged in the circumferential direction. A pair of clamping members each having a pressing portion; and a fastening means for pulling and fixing the pressing portions of the pair of clamping members against the outer surfaces of the pair of flange portions in the flange joining direction. Is a flange joint reinforcement structure in which a plurality of flange joint reinforcement jigs are mounted on the pair of flange parts, and the characteristic configuration thereof is:
The plate-shaped annular protection member is adjacent to the one side surface of the pair of flange portions and the one side pressing portion of the pair of clamping members, and the pair of flange portions. Among the adjacent sides of the other side of the outer side surfaces of the flange portion and the other side pressing portion of the pressing portions of the pair of clamping members, is interposed between at least one adjacent,
The annular protection member is opposed to the outer surface of the pair of flange portions and the opening portion through which the head portion of the connection bolt or the connection nut can be inserted while being interposed between the at least one adjacent portion. A pressed portion formed in a planned pressed portion to be pressed by the pressing portion on the one side or the pressing portion on the other side on the surface opposite to the surface,
A stepped portion projecting in the flange joining direction from the pressed portion is formed at a radially outer side portion of the pressed portion, and the stepped portion is connected to the annular protective member by the flange joint reinforcing jig. Therefore, it is configured as a blocking wall that prevents the detachment movement to the radially outward side.

  According to the above characteristic configuration, the flat annular protective member is interposed between at least one of the adjacent sides of the outer surface of the pair of flange portions and the pressing portion of the pair of sandwiching members. Of the pressing parts of the clamping member, the pressing part on one side or the pressing part on the other side is in contact with the annular protective member, but the pair of clamping members is not in direct contact with the outer surfaces of the pair of flange parts. The fastening means can fasten and fix the outer surfaces of the pair of flange portions. Accordingly, it is possible to reliably prevent the pressing portions of the pair of clamping members from being directly applied to at least one of the outer surfaces of the pair of flange portions, and to prevent the damage. It can prevent satisfactorily that durability falls.

  Further, since the annular protective member is provided with an opening through which the head of the connecting bolt or the connecting nut for fastening and connecting the pair of flange portions can be inserted, the head of the connecting bolt and the connecting nut can be tightened. While maintaining the connection, in a state where the head of the connection bolt and the connection nut are displaced, the annular protection member is at least one of the adjacent portions of the outer surfaces of the pair of flange portions and the pressing portions of the pair of clamping members. In addition to being able to interpose between adjacent parts reliably, when interposing the annular protective member, the head of the connecting bolt or the connecting nut is inserted into the opening to easily and reliably position the annular protective member. Can do.

Further, the annular protection member is formed on a portion to be pressed that is pressed by a pressing portion on one side or a pressing portion on the other side on the surface opposite to the surface facing the outer surface of the pair of flange portions. A pressing portion is provided, and a stepped portion that protrudes in the flange joining direction from the pressed portion is formed on the radially outer side portion of the pressed portion, and the stepped portion is annularly protected by the flange bonding portion reinforcing jig. It is configured as a blocking wall that prevents the member from detaching and moving outward in the radial direction.
For this reason, when the one pressing part or the other pressing part of the pair of clamping members is fixed to the pressed part by the clamping means, the pair of clamping members and the pair of flanges are fixed. Even when a force such as a bending direction or a tensile direction of the fluid pipe acts on the portion, and the pair of clamping members move relative to the pair of flange portions radially outward, at least one of the pressing portion and the other side Any one of the pressing portions comes into contact with a step portion located on the radially outer side of the pressed portion. Thereby, the said step part functions as a blocking wall that prevents the pair of clamping members (flange joint reinforcing jigs) from detaching and moving radially outward with respect to the annular protective member (the pair of flange parts). Therefore, it is possible to maintain a state where at least one of the pressing portion and the pressing portion on the other side is applied to the pressed portion, and the pair of clamping members (flange joint reinforcing jigs) is a pair of flanges. It is possible to reliably prevent separation from the part. Accordingly, it is possible to satisfactorily prevent displacement and separation of the pair of clamping members and further separation of the pair of flange portions, maintain seismic performance, and reliably prevent leakage of fluid flowing inside the fluid pipe. it can.
In addition, when the pair of sandwiching members are mounted on the pair of flange portions, the pressing portion on one side or the pressing portion on the other side is applied to the pressed portion formed to be recessed from the stepped portion in the flange joining direction. By tightening (temporarily assembling) the fastening means to some extent in the state, the pair of clamping members can be easily and reliably positioned at a predetermined mounting position.

  Therefore, the flange joint part reinforcement structure which can protect the outer side surface of a pair of flange part and can improve durability can be obtained, preventing the shift | offset | difference and detachment | leave of a pair of clamping member, and maintaining a seismic performance.

  A further characteristic configuration of the flange joint reinforcing structure according to the present invention is that a plurality of the pressed parts are formed in the circumferential direction, and flanges are provided at both side portions in the circumferential direction of the pressed parts rather than the pressed parts. Steps projecting in the joining direction are formed, and both the step portions are configured as blocking walls that prevent the flange joint reinforcing jig from moving away from the annular protective member in the circumferential direction. It is in.

According to the above characteristic configuration, when the one pressing portion or the other pressing portion of the pair of clamping members is pressed against the pressed portion, the pair of clamping members is fixed by the clamping means. Even when a force such as a bending direction or a tensile direction of the fluid pipe acts on the pair of flange portions and the pair of clamping members move relative to the pair of flange portions in the circumferential direction, at least one pressing portion and the other Any one of the pressing parts on the side comes into contact with one of the stepped parts located on both sides in the circumferential direction of each pressed part.
Accordingly, both the step portions function as blocking walls that prevent the pair of clamping members (flange joint reinforcing jigs) from moving away from the annular protective member (the pair of flange portions) in the circumferential direction. In addition, it is possible to maintain a state where at least one of the pressing portion and the other pressing portion is applied to each pressed portion, and the pair of clamping members (flange joint reinforcing jigs) is a pair of flange portions. It is possible to more reliably prevent the detachment from the vehicle.

  A further characteristic configuration of the flange joint portion reinforcing structure according to the present invention is an arrangement location of the annular seal material in which at least a part of the pressed portion seals between the opposed surfaces of the pair of flange portions in the flange joint direction view. And at least one of the pressing part on the one side and the pressing part on the other side is configured to press the part.

  According to the above characteristic configuration, at least a part of the pressed portion is disposed at a portion overlapping with the disposed portion of the annular sealing material that seals between the opposing surfaces of the pair of flange portions when viewed in the flange joining direction. By tightening and fixing the means, the part can be reliably pressed through at least a part of the pressed part by at least one of the pressing part on one side and the pressing part on the other side. Thereby, an annular sealing material can be reliably pressed by a pair of flange parts, the sealing performance between a pair of flange parts can be improved, and water stop performance can be improved.

  A further characteristic configuration of the flange joint reinforcement structure according to the present invention is that a plurality of the pressed parts are formed in the circumferential direction, and each pressed part is disposed between the connection bolt and the connection nut in the circumferential direction, A plurality of flange joint reinforcing jigs are arranged between adjacent connection bolts and connection nuts arranged in the circumferential direction.

  According to the above characteristic configuration, each of the plurality of pressed portions formed in the circumferential direction is disposed between adjacent connection bolts and connection nuts that are disposed in the circumferential direction. In a state where at least one of the pressing portion on one side and the pressing portion on the other side of the pair of clamping members presses each pressed portion, between the adjacent connection bolts and connection nuts in the circumferential direction. it can. Thereby, a some flange joint part reinforcement jig | tool can be arrange | positioned appropriately, and the separation | spacing of a pair of flange part can be prevented more reliably.

A further characteristic configuration of the flange joint reinforcing structure according to the present invention is that the annular protective member is constituted by a divided protective member divided into a plurality of portions in the circumferential direction, and a fitting portion formed at one end of each divided protective member And a fitted portion formed at the other end,
The fitting part is fitted and connected to the fitted part in a state where the fitting part of the divided protective member and the fitted part of the other divided protective member adjacent to each other overlap in the flange joining direction view. There is in point.

  According to the above characteristic configuration, each of the divided protective members divided in the circumferential direction has the other end of the other divided protective member adjacent to the fitting portion formed at one end of the divided protective member when viewed in the flange joining direction. Since the fitting part is fitted and connected to the fitted part in a state where the fitted part formed on the part overlaps, the annular protective member is formed. The operation of interposing between the side surface and the pressing portion on one side or the pressing portion on the other side of the pair of clamping members can be simply performed by fitting the fitting portion and the fitted portion.

  According to a further feature of the flange joint reinforcing structure according to the present invention, the fitting portion is a protruding portion that protrudes from one end of each of the divided protective members in the flange joining direction, and the fitted portion is each of the divided portions. The other end portion of the protective member is a through-hole portion penetrating in the flange joining direction.

  According to the above characteristic configuration, the fitting portion is a protruding portion that protrudes from one end of each divided protection member in the flange joining direction, and the fitted portion penetrates in the flange joining direction at the other end of each divided protection member. Since it is a through-hole part, the fitting part formed in the other end part of the other division | segmentation protection member adjacent to the fitting part formed in the one end part of division | segmentation protection member in the flange joining direction view overlaps. The projecting portion can be fitted and connected to the through hole portion from the flange joining direction. As a result, the projecting portion is fitted into the through-hole portion in the operation of interposing each divided protection member between the outer surface of the pair of flange portions and the pressing portion on one side or the pressing portion on the other side of the pair of clamping members. It is possible to carry out by a simple operation only by combining them. Further, even if each split protection member tries to move relative to the pair of flange portions in the circumferential direction, the relative movement is well prevented by the protruding portion and the through-hole portion that are fitted and connected in the flange joining direction, and By fitting and connecting the projecting portion and the through-hole portion, each divided protection member can be easily maintained in an annular shape.

  A further characteristic configuration of the flange joint reinforcing structure according to the present invention is that the opening is formed in a circular shape into which the head of the connection bolt or the connection nut can be inserted.

  According to the above characteristic configuration, since the opening is formed in a circular shape through which the head of the connecting bolt or the connecting nut can be inserted, the annular protective member is one of the outer surface of the pair of flange portions and the pair of holding members. When interposing between the adjacent pressing portion on the side or the pressing portion on the other side and inserting the head of the connecting bolt or the connecting nut into the opening, the inner peripheral surface of the opening in the flange joining direction view Is positioned on the outer diameter side of the head of the connecting bolt or the connecting nut, and the annular protective member can be easily and reliably positioned by the opening.

  In order to achieve the above object, an annular protective member according to the present invention is an annular protective member used in a flange joint reinforcing structure having any one of the above-described features.

According to the above characteristic configuration, the annular protection member is used in the flange joint portion reinforcing structure, and between at least one of the adjacent portions of the outer surface of the pair of flange portions and the pressing portion of the pair of clamping members. An opening that can be inserted through the head of the connecting bolt or the connecting nut while being interposed between at least one of the adjacent parts, and a surface opposite to the outer surface of the pair of flange portions And a pressed portion formed at a pressed portion to be pressed by the pressing portion on one side or the pressing portion on the other side of the surface, and further on the radially outer side portion of the pressed portion. As a blocking wall for preventing the flange joint reinforcing jig from detaching and moving outward in the radial direction with respect to the annular protective member, a step is formed protruding in the flange joining direction from the pressing part. It is configured.
Accordingly, it is possible to reliably prevent the pressing portions of the pair of clamping members from being directly applied to at least one of the outer surfaces of the pair of flange portions, and to prevent the damage. It can prevent satisfactorily that durability falls. Further, while maintaining the tightened connection of the heads of the connection bolts and the connection nuts, the annular protection member is sandwiched between the outer surfaces of the pair of flange portions and the pair of clamps while the heads of the connection bolts and the connection nuts are displaced. While being able to be reliably inserted between at least one of the adjacent portions with the pressing portion of the member, when the annular protective member is interposed, the head of the connecting bolt and the connecting nut are inserted into the opening. Thus, the annular protective member can be easily and reliably positioned. Furthermore, it is possible to satisfactorily prevent displacement and separation of the pair of clamping members and further separation of the pair of flange portions, maintain seismic performance, and reliably prevent leakage of fluid flowing through the fluid pipe. it can.
Therefore, an annular protective member used in a flange joint reinforcement structure that can prevent the displacement and detachment of a pair of sandwiching members to maintain the earthquake resistance and protect the outer surfaces of the pair of flanges to improve durability. I was able to get it.

Partial longitudinal sectional view of a pair of flange portions Partial cross-sectional view of a pair of flange portions Partial cross-sectional view showing mounting state of flange joint reinforcing jig and annular protective member IV-IV arrow view of FIG. VV arrow view of FIG. The figure which shows schematic structure of a 1st clamping member The figure which shows schematic structure of a 2nd clamping member The exploded perspective view which shows schematic structure of the 1st and 2nd clamping member and a fastening means Side view showing schematic configuration of annular protective member Top view showing a schematic configuration of the annular protective member The perspective view which shows schematic structure of a cyclic | annular protection member A longitudinal sectional view showing a schematic configuration of an annular protective member according to another embodiment The longitudinal cross-sectional view which shows the mounting state of the 1st and 2nd clamping member which concerns on another embodiment

Hereinafter, based on FIGS. 1-11, embodiment of the cyclic | annular protection member R used for the flange junction part reinforcement structure M and the said flange junction part reinforcement structure M is described.
1 and 2 show a flange joint part in the middle of a fluid piping system (pipe), and circular plates are formed radially outward at the ends of both cast iron water pipes (one example of both fluid pipes) 1 and 1, respectively. A pair of flange portions 1A, 1B extending in the shape of a ring are connected in a state where a ring-shaped sheet-like gasket (an example of an annular seal material) 2 is interposed between the flange portions 1A, 1B. The bolts 4 </ b> A and the connecting nuts 4 </ b> B (6 in this embodiment) are connected. A plurality of through holes 3 (six in this embodiment) that penetrate in the flange joining direction (axial direction) are formed in both flange portions 1A, 1B at equal intervals in the circumferential direction, and are connected to these through holes 3 The bolt 4A is inserted, and the connecting nut 4B is screwed and fixed to the distal end side of the male screw portion 4b of the connecting bolt 4A. In addition, both flange parts 1A and 1B of this embodiment are what is called RF type flanges.

  Here, in the following, in both flange portions 1A and 1B, the surfaces on which the water pipe 1 protrudes are referred to as outer surfaces 1a and 1a, and both flange portions 1A and 1B are connected by a connecting bolt 4A and a connecting nut 4B. The surfaces facing each other in the flange joining direction (axial direction) will be referred to as joining surfaces 1b and 1b, and the radially outward surfaces of the flange portions 1A and 1B will be described as outer peripheral surfaces 1c and 1c.

First, the flange joint reinforcement jig P of the flange joint reinforcement structure M will be described.
As shown in FIGS. 3 and 5 to 8, the flange joint reinforcing jig P is in contact with the outer surface 1 a of the flange portion 1 </ b> A in both flange portions 1 </ b> A and 1 </ b> B that are bolted as described above. The first clamping member 5 provided with a pressing part 5C that can be pressed, the second clamping member 6 provided with a pressing part 6B that can be pressed against the outer surface 1a of the flange part 1B, and the pressing of the first clamping member 5 With the pressing portion 6B of the portion 5C and the second clamping member 6 applied to the outer surfaces 1a and 1a of the flange portions 1A and 1B, the first clamping member 5 and the second clamping member 6 are connected in the flange joining direction ( And fastening means 7 for fastening in the axial direction.

  As shown in FIGS. 5, 6, and 8, the first clamping member 5 is made of a metal material, and has a substantially bottomed rectangular tube whose outer surface 5 a has a substantially quadrangular shape and whose inner peripheral surface 5 b has a circular shape in a cross-sectional view. The inner fitting portion 5A formed in a shape (an example of a cylindrical shape) and a flange extending outward from the outer surface 5a of the inner fitting portion 5A over the entire circumference at one end of the inner fitting portion 5A 5B and the pressing part 5C extending further outward from one side of the four sides of the bowl-shaped part 5B are integrally provided.

  The inner fitting portion 5A is formed in a substantially square shape in a side view (see FIG. 6A), and a male screw portion 7a of a fastening bolt 7A of the fastening means 7 described later is inserted into the inner fitting portion 5A. A possible cylindrical inner space 5c is formed. The inner diameter of the cylindrical inner space 5c is slightly larger than the outer diameter of the male screw portion 7a of the fastening bolt 7A.

  The bowl-shaped part 5B is formed in a substantially square shape in a side view (see FIG. 6A), and the cylindrical internal space 5c is formed through the central part in a cross-sectional view.

  In the cylindrical internal space 5c, the side on which the flange 5B and the pressing part 5C are formed is formed with an opening, and the side opposite to the side on which the flange 5B and the pressing part 5C are formed is the male screw of the fastening bolt 7A. A female screw portion 5d to which the portion 7a can be screwed is formed so as to penetrate the bottom of the inner fitting portion 5A. That is, the female screw portion 5d is formed at an end portion on the opposite side to the side on which the flange portion 5B and the pressing portion 5C are formed on the inner peripheral surface 5b of the cylindrical inner space 5c in the inner fitting portion 5A. Yes.

  The pressing portion 5C is formed in a slightly tapered shape in a side view (see FIG. 6A), and is formed in a tapered shape that inclines toward the female screw portion 5d as it goes to the tip side in a longitudinal sectional view (see FIG. 6). (See (b)), the tip portion of the surface of the pressing portion 5C on the female screw portion 5d side is formed as a pressing surface 5e perpendicular to the outer surface 5a of the inner fitting portion 5A.

  As shown in FIGS. 3, 5, 7, and 8, the second clamping member 6 is made of a metal member, and has a substantially bottomed rectangular tube shape in which the outer surface 6 a and the inner surface 6 b are substantially rectangular in a cross-sectional view ( 6A of outer fitting parts formed in the example of a cylindrical shape, and the press part extended in the outer side from one side of the four sides of the outer surface 6a of the said outer fitting part 6A in the one end part of the outer fitting part 6A 6B is integrally provided.

The outer fitting portion 6A is formed in a substantially square shape in a side view (see FIG. 7A), and a cylinder in which the inner fitting portion 5A of the first holding member 5 can be inserted into the outer fitting portion 6A. A shaped internal space 6c is formed. The cylindrical internal space 6c is formed in a substantially square shape in a cross-sectional view, and is formed slightly larger than the inner fitting portion 5A having a substantially square shape in a cross-sectional view. For this reason, the fitting shape between the outer surface 5a of the inner fitting portion 5A and the inner surface 6b of the outer fitting portion 6A is such that the inner fitting portion 5A is inserted (fitted) into the cylindrical inner space 6c of the outer fitting portion 6A. Then, it is slidable in the insertion direction (longitudinal direction of the cylindrical internal space 6c), but cannot be relatively rotated around the insertion direction (around the axis along the longitudinal direction of the cylindrical internal space 6c). It is formed as follows.
Further, in the cylindrical internal space 6c, an opening is formed on the side opposite to the side where the pressing portion 6B is formed, and the side where the pressing portion 6B is formed can insert the male screw portion 7a of the fastening bolt 7A and the head. An insertion hole 6d that cannot be inserted through the portion 7b is formed so as to penetrate the bottom of the outer fitting portion 6A. In a state where the male screw portion 7a of the fastening bolt 7A is inserted through 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. 5).

  Similar to the pressing portion 5C of the first clamping member 5, the pressing portion 6B is formed in a slightly tapered shape in a side view (see FIG. 7A), and the pressing portion as it goes to the tip side in a longitudinal sectional view. 6B is formed in a tapered shape that is inclined to the opposite side to the side on which 6B is formed (see FIG. 7B), and the distal end portion of the surface of the pressing portion 6B opposite to the insertion hole 6d is the outer fitting portion. It is formed as a pressing surface 6e perpendicular to the outer surface 6a of 6A.

  As shown in FIGS. 3 and 5 to 8, the fastening means 7 includes the above-described fastening bolt 7 </ b> A inserted into the cylindrical inner space 6 c from the outside of the outer fitting portion 6 </ b> A through the insertion hole 6 d, It is comprised from the internal thread part 5d formed in the internal peripheral surface 5b of 5 A of fitting parts.

Next, the annular protective member R used for the flange joint reinforcement structure M will be described.
As shown in FIGS. 3 to 5 and FIGS. 9 to 11, the annular protective member R is constituted by a pair of semicircular divided protective members R <b> 1 formed in a flat plate shape. That is, the annular protective member R is divided into two in the circumferential direction, and is configured to have an annular shape by connecting both end portions of each divided protective member R1. In a state where both ends of each divided protection member R1 are connected to form an annular shape, the inner peripheral surface (not shown) and the outer peripheral surface (not shown) are configured to be concentric circles, and both flange portions 1A 1B has an outer diameter slightly smaller than the outer peripheral surface 1c, and has an inner diameter slightly larger than the outer diameter of the fluid pipe 1. The flat annular protective member R1 is basically formed so that the front surface Rf and the rear surface Rr are parallel and have a constant thickness. Moreover, although each division | segmentation protection member R1 is comprised with the metal member, it can also be comprised with another member.

  A plurality of circular through-holes (an example of an opening) 8 that penetrates in the thickness direction from the front surface Rf side to the back surface Rr side are formed in each flat divided protective member R1 at equal intervals in the circumferential direction. (In FIG. 9, three places are provided in the circumferential direction). Each circular through-hole 8 tightens and connects the pair of flange portions 1A and 1B when the rear surface Rr of each divided protection member R1 is attached in contact with the outer surface 1a of both flange portions 1A and 1B. The connecting bolt 4A is formed so as to penetrate the head of the connecting bolt 4A or the connecting nut 4B. Each circular through-hole 8 is formed in a circular shape having an inner diameter slightly larger than the head of the connecting bolt 4A and the connecting nut 4B formed in a regular hexagonal shape in a side view.

A plurality of pressed recesses (an example of a pressed portion) 9 that are recessed from the surface Rf side to the back surface Rr side in a side view are provided on the front surface Rf of each split protection member R1 in the circumferential direction. It is formed (two in the circumferential direction in FIG. 9), and each pressed recess 9 is disposed at an intermediate portion between adjacent circular through holes 8 in the circumferential direction.
In addition, each depressed recess 9 has an inner circumferential surface (diameter) on the surface Rf of each divided protective member R1 relative to the outer peripheral surface (radially outer surface, not shown) of each divided protective member R1 in a side view. It is arranged at a position that is biased toward the inner side surface (not shown), and is configured such that the inner diameter side portion of each pressed recess 9 communicates with the inner peripheral surface side of each divided protection member R1. In other words, each depressed recess 9 is formed by a substantially U-shaped step portion 9A that opens to the inner peripheral surface side of the split protection member R1, and each step portion 9A is approximately the surface Rf of each split protection member R1. It is orthogonal and is erected in a straight line along the thickness direction of each divided protection member R1.
Therefore, the thickness of each pressed recess 9 is formed so as to be thinner than the thickness of each divided protection member R1 other than the portion where each pressed recess 9 is formed. Since the pressing portion 5C of the clamping member 5 and the pressing portion 6B of the second clamping member 6 are formed in a tapered shape, the pressing surface 5e of the pressing portion 5C and the stepped portion 9A are not obstructed by the substantially U-shaped step portion 9A. The pressing surface 6 e of the pressing portion 6 </ b> B is configured to be able to contact each pressed recess 9.

  The substantially U-shaped step portion 9A includes, in a side view, a first linear step portion 9a that is located on the radially outer side of each pressed recess 9 and orthogonal to the radial direction, and each pressed recess. 9 and a pair of second linear step portions 9b which are located on both sides in the circumferential direction and are orthogonal to the first linear step portion 9a. That is, a step projecting in a direction away from the outer surface 1a of the flange portion 1A or the flange portion 1B in the flange joining direction from the pressed recess 9 in the radially outward portion of each pressed recess 9. Portion (first linear step portion 9a) is formed, and the outer side surface of the flange portion 1A or the flange portion 1B is located on both sides in the circumferential direction of each pressed recessed portion 9 in the flange joining direction with respect to each pressed recessed portion 9. The step part (2nd linear step part 9b) which protrudes in the direction away from 1a will be formed.

  Each split protection member R1 includes a fitting portion 10 formed at one end and a fitted portion 11 formed at the other end, and is adjacent to the fitting portion 10 of the split protection member R1 in a side view. The fitting part 10 is configured to be fitted and connected to the fitted part 11 in a state where the fitted part 11 of the other split protection member R1 overlaps.

  Specifically, the fitting portion 10 includes a recessed portion 10a that is recessed with a dimension slightly smaller than the thickness of the split protection member R1 from the back surface Rr toward the front surface Rf side on the back surface Rr of the split protection member R1. A circular projecting portion 10b projecting in the thickness direction of the split protection member R1 with a dimension slightly smaller than the dimension at a substantially central portion of the recess portion 10a and a boundary between the recess portion 10a and the back surface Rr. And a stepped portion 10c. In addition, in the surface Rf of each division | segmentation protection member R1, the location corresponding to the site | part in which the recessed part 10a was formed in the back surface Rr side is formed so that it protrudes rather than another site | part by the part in which the said recessed part 10a was formed. ing.

  The fitted portion 11 is a hollow portion that is recessed on the surface Rf of the divided protective member R1 by a dimension obtained by subtracting the hollow dimension of the hollow portion 10a from the thickness of the divided protective member R1 from the front surface Rf toward the back surface Rr. 11a, a through-hole portion 11b penetrating in the thickness direction at a substantially central portion of the recess portion 11a, and a step portion 11c formed at the boundary between the recess portion 11a and the surface Rf.

Accordingly, in a side view, the protruding portion 10b penetrates from the thickness direction of the split protection member R1 in a state where the fitting portion 10 of the split protection member R1 and the fitted portion 11 of the other split protection member R1 adjacent to each other overlap. When fitted and connected to the hole portion 11b, the hollow portion 10a and the hollow portion 11a overlap, and the end surface (not shown) of the fitting portion 10 contacts the stepped portion 11c of the fitted portion 11 in the circumferential direction. In the circumferential direction, the end surface (not shown) of the fitted portion 11 is in contact with the stepped portion 10c of the fitted portion 10. In addition, the back surface Rr of the fitting part 10 and the to-be-fitted part 11 is the same state.
Thus, by fitting and connecting the fitting portion 10 to the fitted portion 11, the relative movement between the respective divided protective members R1 in the circumferential direction can be satisfactorily prevented, and each divided protective member R1 is securely fitted. It is connected and the annular protective member R can be reliably maintained in an annular shape.

  Next, an operation process of mounting the annular protective member R and the flange joint reinforcing jig P on the pair of flange portions 1A and 1B connected by the plurality of connection bolts 4A and the connection nut 4B will be described.

As shown in FIG.10 and FIG.11, the fitting part 10 and the to-be-fitted part 11 in a pair of division | segmentation protection member R1 which comprise the cyclic | annular protection member R are fittingly connected.
Specifically, the protruding portion 10b of the fitting portion 10 of the split protection member R1 on one side is fitted and connected to the through hole portion 11b of the fitted portion 11 of the split protection member R1 on the other side, and the recess 10a, 11a are overlapped with each other in the thickness direction of the divided protective member R1. In this state, as shown in FIGS. 3 to 5, each split protection member R1 is inserted into each circular through hole 8 at the head of each fastening bolt 4A, and the back surface Rr is the outer surface 1a of the flange portion 1B. Attach to touch.

  Subsequently, in the same manner as the above-described annular protection member R, each split is performed in a state in which the fitting portion 10 and the fitted portion 11 in the pair of divided protection members R1 constituting another annular protection member R are fitted and connected. The protection member R1 is mounted such that each fastening nut 4B is inserted into each circular through hole 8 and the back surface Rr is in contact with the outer surface 1a of the flange portion 1A.

  In addition, it is not the structure which attaches each division | segmentation protection member R1 to the outer surface 1a of the flange part 1A at once, but after each division | segmentation protection member R1 is separately attached to the flange part 1A, the fitting part 10 and the to-be-fitted part 11 can be fitted and connected. The same applies when each division protection member R1 is mounted on the flange portion 1B.

At the time of mounting, each divided protective member R1 divided into two in the circumferential direction has a fitting portion 10 formed at one end of the divided protective member R1 and another adjacent divided protective member when viewed in the flange joining direction. Since the fitting portion 10 is fitted and connected to the fitted portion 11 in a state where the fitted portion 11 formed on the other end portion of the member R1 overlaps, the annular protection member R is formed. The protective member R is interposed between the outer surfaces 1a, 1a of the pair of flange portions 1A, 1B and the pressing surface 5e of the pressing portion 5C of the first clamping member 5 or the pressing surface 6e of the pressing portion 6B of the second clamping member 6. The wearing operation can be performed simply by fitting the fitting portion 10 and the fitted portion 11 together.
In addition, the fitting between the fitting portion 10 and the fitted portion 11 can be performed by a very simple operation of fitting and connecting the protruding portion 10b to the through hole portion 11b from the flange joining direction. Even if the split protection member R1 tries to move relative to the pair of flange portions 1A and 1B in the circumferential direction, the relative movement is satisfactorily prevented by the protruding portion 10b and the through-hole portion 11b that are fitted and connected in the flange joining direction. In addition, the split protection member R1 can be easily maintained in an annular shape by fitting and connecting the protruding portion 10b and the through-hole portion 11b.

  Furthermore, when mounting these, each circular through-hole 8 is in a position corresponding to the head of each fastening bolt 4A or the connecting nut 4A, and more than the outer diameter of the head of the fastening bolt 4A and the connecting nut 4B. Since the opening is formed in a slightly large-diameter circular shape, when the annular protective member R is interposed between the outer surfaces 1a and 1a of the pair of flange portions 1A and 1B and the pressing surface 5e or the pressing surface 6e, When the head of the connecting bolt 4A or the connecting nut 4B is inserted through the circular through hole 8, the inner peripheral surface of the circular through hole 8 is the outer diameter of the head of the connecting bolt 4A or the connecting nut 4B in the flange joining direction view. The annular protective member R can be easily and reliably positioned by the circular through hole 8.

  Thus, when each annular protection member R is mounted, each fitted recess 9 of each annular protection member R is arranged in a state of being positioned at an intermediate portion between the adjacent connection bolts 4A and connection nuts 4B. ing.

Next, as shown in FIG. 8, the inner fitting portion 5A of the first clamping member 5 and the outer fitting portion 6A of the second clamping member 6 are connected to the bottom side (the female screw portion 5d side) of the inner fitting portion 5A. From the outer peripheral surfaces 1c and 1c of the pair of flange portions 1A and 1B so that the inner fitting portion 5A is fitted into the cylindrical inner space 6c of the outer fitting portion 6A. Fit from the joining direction.
At this time, since the outer surface 5a of the inner fitting portion 5A and the inner surface 6b of the outer fitting portion 6A are formed in a substantially square shape that is not relatively rotatable in a cross-sectional view, the pressing portion of the first clamping member 5 5C and the pressing part 6B of the 2nd clamping member 6 can be easily fitted in the state positioned in the intended relative positional relationship extended in the same direction. That is, the inner fitting portion 5A is externally fitted so that the pressing surface 5e of the pressing portion 5C of the first clamping member 5 and the pressing surface 6e of the pressing portion 6B of the second clamping member 6 face each other in the flange joining direction. It is fitted to the part 6A (see FIG. 5).
Here, the fitting between the inner fitting portion 5A and the outer fitting portion 6A is performed once in the flange joining direction in which the interval between the pressing surface 5e and the pressing surface 6e is the annular protective member R attached to the flange portion 1A. The surface Rf is larger than the distance between the surface Rf of the annular protective member R attached to the flange portion 1B.

  As shown in FIG. 5, in a state in which the inner fitting portion 5A and the outer fitting portion 6A are fitted, the pressing portion 5C of the first clamping member 5 and the outer surface 5a of the inner fitting portion 5A in a longitudinal sectional view. And a substantially U-shaped recess (not shown) formed by the pressing portion 6B of the second clamping member 6 and the outer surface 6a of the outer fitting portion 6A are connected to the connecting bolts in the circumferential direction in the pair of flange portions 1A and 1B. 4A and the connecting nut 4B are externally fitted from the outside in the radial direction to the adjacent portions of the bolt connecting portions.

Subsequently, each pressed recess 9 formed on the surface Rf of the annular protective member R mounted in a state where the pressing surface 5e of the pressing portion 5C of each first clamping member 5 is in contact with the outer side surface 1a of the flange portion 1A. Each pressed recess formed on the surface Rf of the annular protective member R which is in contact with and is mounted in a state where the pressing surface 6e of the pressing portion 6B of each second clamping member 6 is in contact with the outer surface 1a of the flange portion 1B. The inner fitting portion 5A and the outer fitting portion 6A are pulled in the flange joining direction until the inner fitting portion 5A is brought into contact with the inner fitting portion 9A until the inner fitting portion 5A is fitted into the cylindrical inner space 6c of the outer fitting portion 6A.
Then, the male screw portion 7a of the fastening bolt 7A is inserted into the cylindrical inner space 6c through the insertion hole 6d from the outside of the outer fitting portion 6A in the flange joining direction, and the head portion 7b of the fastening bolt 7A is Until it abuts on the outer surface (not shown) of the fitting portion 6A, it is screwed and fixed to the female screw portion 5d of the inner fitting portion 5A fitted in the cylindrical inner space 6c.

  Accordingly, the pressing surface 5e of the pressing portion 5C of the first clamping member 5 is applied to the pressed concave portion 9 of the annular protective member R interposed between the pressing surface 5e and the outer surface 1a of the flange portion 1A. In addition, the pressing surface 6e of the pressing portion 6B of the second clamping member 6 is applied to the pressed concave portion 9 of the annular protective member R interposed between the pressing surface 6e and the outer surface 1a of the flange portion 1B. In the attached state, the first clamping member 5 and the second clamping member 6 can be pulled in the flange joining direction by the fastening means 7 and fastened and fixed.

In this state, the first clamping member 5 and the second clamping member 6 are mounted between the connection bolt 4A and the connection nut 4B in the circumferential direction.
Further, in this state, in the flange joining direction, at least a part of the pressed recess 9 is disposed at a portion overlapping with the placement location of the gasket 2 that seals between the facing surfaces of the pair of flange portions 1A and 1B. 5e and 6e are arranged so as to press the part. Thereby, when the fastening means 7 is fastened and fixed in the flange joining direction view, the pressing surface 5e, 6e can surely press the part via at least a part of the pressed recess 9. The gasket 2 can be surely pressed by the pair of flange portions 1A and 1B, and the sealing performance between the pair of flange portions 1A and 1B can be improved to improve the water stop performance.

  Next, after mounting the flange joint reinforcing jig P, another flange joint reinforcing jig P is attached to each pressed recessed portion 9 formed in another part in the circumferential direction in the two annular protective members R. (In FIG. 3, four flange joint reinforcing jigs P are arranged in the circumferential direction).

  Thus, in the flange joint part reinforcement structure M provided with the annular protection member R and the flange joint part reinforcing jig P according to the present embodiment, the plate-like annular protection member R is the outer surface of the pair of flange parts 1A, 1B. 1a, 1a and the pressing surface 5e of the pressing portion 5C of the first clamping member 5 and the pressing surface 6e of the pressing portion 6B of the second clamping member 6 are respectively interposed between the pressing surfaces 5e, 6e. Is in contact with the pressed recess 9 of the annular protection member R, but is not in direct contact with the outer surfaces 1a and 1a of the pair of flange portions 1A and 1B. Can be fastened and fixed to the outer surfaces 1a, 1a of the pair of flange portions 1A, 1B by the fastening means 7. Thereby, it can prevent reliably that both press surface 5e, 6e is directly applied to the outer side surface 1a, 1a of a pair of flange parts 1A, 1B, and a water pipe 1 and a pair of pair by generation | occurrence | production of corrosion etc. It can prevent favorably that the durability of flange parts 1A and 1B falls.

  Each annular protection member R is pressed by the pressing surfaces 5e and 6e on the surface (front surface Rf) opposite to the surface (back surface Rr) facing the outer surfaces 1a and 1a of the pair of flange portions 1A and 1B. Since there are a plurality of pressed recesses 9 that are recessed in the flange joining direction at the planned pressed portion, the fastening means 7 is tightened with the pressing surfaces 5e and 6e applied to the pressed recesses 9. By fixing, both the pressing surfaces 5e and 6e can be easily and reliably positioned at a predetermined mounting position, and the first and second clamping members 5 and 6 and a pair of flange portions due to an earthquake, non-uniform sinking, etc. Even when a force such as a bending direction or a tensile direction of the water pipes 1 and 1 acts on 1A and 1B, it is possible to prevent the pressing surfaces 5e and 6e from being detached from the pressed recesses 9. Thereby, the displacement and detachment of the first clamping member 5 and the second clamping member 6 and the separation of the pair of flange portions 1A and 1B can be satisfactorily prevented, the seismic performance is maintained, and the interior of the water pipe 1 is passed. Leakage of flowing fluid can be reliably prevented.

In particular, when the first clamping member 5 and the second clamping member 6 are clamped and fixed by the clamping means 7 with the pressing surfaces 5e and 6e being applied to the pressed recesses 9, the first clamping member 5 and the second clamping member 6 and the pair of flange portions 1A and 1B, a force in the bending direction or the pulling direction of the water pipe 1 acts, and the first clamping member 5 and the second clamping member 6 are a pair of flange portions 1A, Even in the case of relative movement to the outer side in the radial direction with respect to 1B, the first linear step portion 9a located on the outer side in the radial direction among the step portions 9A in which the pressing surfaces 5e and 6e form the pressed recess 9 is provided. Will abut.
As a result, the first linear step 9a is connected to the first holding member 5 and the second holding member 6 (flange joint reinforcing jig P) with respect to the annular protective member R (the pair of flange portions 1A and 1B). Since it functions as a blocking wall that prevents the detachment movement to the radially outward side, it is possible to maintain the state where both the pressing surfaces 5e and 6e are applied to the pressed recesses 9, and the first clamping member 5 and It is possible to more reliably prevent the second holding member 6 (flange joint reinforcing jig P) from being detached from the pair of flange portions 1A and 1B.

Further, when the pressing surfaces 5e, 6e of the first clamping member 5 and the second clamping member 6 are fixed to the pressed recesses 9 by the clamping means 7, the first clamping member 5 and the second clamping member 6 and the pair of flange portions 1A and 1B, a force in the bending direction or the pulling direction of the water pipe 1 acts, and the first clamping member 5 and the second clamping member 6 are a pair of flange portions 1A, Even in the case of relative movement in the circumferential direction with respect to 1B, any one of the second linear step portions 9b located on both sides in the circumferential direction among the step portions 9A in which both the pressing surfaces 5e and 6e form the pressed recessed portions 9 Will abut.
Accordingly, the second linear step portion 9b has the first clamping member 5 and the second clamping member 6 (flange joint reinforcing jig P) with respect to the annular protection member R (the pair of flange portions 1A and 1B). Since it functions as a blocking wall for preventing the separation movement in the circumferential direction, it is possible to maintain the state where both the pressing surfaces 5e, 6e are applied to the pressed recesses 9, and the first clamping member 5 and the second clamping pin It is possible to more reliably prevent the member 6 (flange joint reinforcing jig P) from separating from the pair of flange portions 1A and 1B.

  Therefore, the outer surfaces 1a and 1a of the pair of flange portions 1A and 1B are protected and the durability is improved while preventing the displacement and detachment of the first clamping member 5 and the second clamping member 6 and maintaining the earthquake resistance. The obtained flange joint reinforcement structure M and the annular protective member R used in the flange joint reinforcement structure M could be obtained.

  In the flange joint portion reinforcing structure M according to the present embodiment, in the state where the first clamping member 5 and the second clamping member 6 are fastened and fixed by the fastening means 7, the female screw portion 5d of the inner fitting portion 5A is Since the fastening bolt 7A is positioned close to the head 7b, the screwed portion between the female screw portion 5d and the male screw portion 7a of the fastening bolt 7A is located at the head 7b of the fastening bolt 7A. Accordingly, the distance between the head 7b of the fastening bolt 7A and the screwed portion in the flange joining direction (axial direction) can be made relatively small. Thereby, even when a force in the bending direction (radial direction) or the tensile direction (axial direction) acts on both flange portions 1A and 1B, it is possible to prevent the fastening bolt 7A from being stretched and broken well, and both flange portions. It is possible to satisfactorily prevent the separation and displacement of 1A and 1B and the accompanying fluid leakage. Further, the female screw portion 5d can be positioned at the overlapping portion of the inner fitting portion 5A and the outer fitting portion 6A in the cylindrical inner spaces 5c, 6c, and the length of the fastening bolt 7A is made relatively short. It is possible to satisfactorily prevent the tip of the fastening bolt 7A from protruding outside the cylindrical inner spaces 5c, 6c, and to save space without impairing the appearance of the flange joint reinforcing jig P. be able to.

Here, in the flange joint portion reinforcing structure M according to the present embodiment, the fitting between the inner fitting portion 5A and the outer fitting portion 6A is performed in the inner fitting portion 5A and the outer fitting portion 6A in the flange joining direction. The size of the overlapping portion (fitting distance) can be arbitrarily adjusted within a predetermined range. Along with this adjustment, the pressing surface 5e of the pressing portion 5C of the first clamping member 5 and the second clamping member 6 are configured. The distance between the pressing portion 6B and the pressing surface 6e can be arbitrarily adjusted within a predetermined range. Therefore, in a state where the size of the overlapping portion (fitting distance) between the inner fitting portion 5A and the outer fitting portion 6A in the flange joining direction and the interval between the pressing surface 5e and the pressing surface 6e are appropriately set, The first clamping member 5 and the second clamping member 6 can be fastened and fixed by fastening means 7 described later.
Therefore, when the wall thickness of both flange parts 1A and 1B is changed according to the nominal diameter and design pressure of both flange parts 1A and 1B (for example, wall thickness thinner than the wall thickness of both flange parts 1A and 1B, Even when the flange joint reinforcing jig P is attached to both thick flange portions) or when the thickness of the annular protective member R is appropriately changed, the inner fitting portion 5A and the outer fitting portion By adjusting the size (fitting distance) of the overlapping portion with 6A, the pressing surface 5e of the pressing portion 5C of the first clamping member 5 is brought into contact with the pressed recess 9 of the annular protective member R and the second clamping is performed. With the pressing surface 6e of the pressing portion 6B of the member 6 in contact with the pressed recess 9 of the annular protective member R, the male screw portion 7a of the fastening bolt 7A is screwed into the female screw portion 5d of the inner fitting portion 5A. The inner fitting portion 5A and the outer fitting portion 6A, and thus the first holding member 5 and the second holding member 6 are Flange 1A, can be satisfactorily fastened to 1B.

[Another embodiment]
(A) In the above embodiment, each of the pair of divided protective members R1 as the annular protective member R is provided with a plurality of pressed recesses (an example of a pressed portion) 9 formed by a substantially U-shaped step portion 9A. In addition, although a plurality of circular through holes 8 (an example of an opening) through which the head of the connection bolt 4A or the connection nut 4B can be inserted are provided, other configurations can be adopted as the annular protection member R.

For example, as shown in FIG. 12, the annular protective member R can be constituted by a pair of semicircular divided protective members R2. Each divided protection member R2 is formed in a flat plate shape, and basically, in a state where both ends (fitting portion 10 and fitted portion 11) of each divided protection member R2 are connected to form an annular shape, An inner peripheral surface (not shown) and an outer peripheral surface (not shown) are configured to be concentric, have an outer diameter slightly smaller than the outer peripheral surface 1c of both flange portions 1A, 1B, and the fluid pipe 1 The inner diameter is slightly larger than the outer diameter.
And in the inner peripheral surface of each split protection member R2, a depression is formed from the inner peripheral surface toward the outer peripheral surface side (radially outward side) in the thickness direction view (side view) of each split protection member R2, A plurality of insertion openings 8A (an example of an opening) formed through the front surface Rf and the rear surface Rr of each division protection member R2 are formed at equal intervals in the circumferential direction (in FIG. 12, 3). Point by point). Each insertion opening 8A is formed in a substantially U-shape with the inner peripheral surface opened in the thickness direction, and the rear surface Rr of each split protection member R2 is contacted with the outer surfaces 1a, 1a of both flange portions 1A, 1B. When mounted in a state of contact, the head of the connecting bolt 4A for tightening and connecting the pair of flange portions 1A and 1B or a position where the connecting nut 4B can be inserted is formed. In addition, on the outer peripheral surface of each split protection member R2, a convex portion 13 projecting radially outward is provided in a circumferential direction at a position substantially corresponding to a portion where each insertion opening 8A is formed in a side view. Since a plurality of them are formed (three in FIG. 12), the flange joint reinforcing jig P is placed between the adjacent convex portions 13 when or when the flange joint reinforcing jig P is attached. A plurality of recesses 12 that can be positioned are formed (three in FIG. 12).
On the front surface Rf of each split protection member R2, a plurality of pressed recesses (an example of a pressed portion) 90 that are recessed from the front surface Rf side to the back surface Rr side in a side view are spaced apart in the circumferential direction. It is formed (two in the circumferential direction in FIG. 12), and each pressed recessed portion 90 is disposed between adjacent insertion openings 8A in the circumferential direction.
In addition, each depressed recess 90 has an inner circumferential surface (diameter) on the surface Rf of each divided protective member R2 relative to the outer peripheral surface (surface on the radially outer side, not shown) of each divided protective member R2 in a side view. It is arranged at a position biased toward the inner surface in the direction (not shown), the inner diameter side portion of each pressed recess 90 communicates with the inner peripheral surface side of each divided protection member R2, and both end portions in the circumferential direction are adjacent to each other It is comprised so that it may connect with the opening part 8A for insertion. That is, each pressed recess 90 is formed by an arcuate step 9B that is concentric with the inner peripheral surface of each split protection member R2 and intersects the adjacent insertion opening 8A from the circumferential direction. Each arcuate step portion 9B is substantially perpendicular to the surface Rf of each divided protective member R2, and is erected in a straight line along the thickness direction of each divided protective member R2.
Therefore, the thickness of each pressed recess 90 is formed to be thinner than the thickness of each split protection member R2 other than the portion where each pressed recess 90 is formed. Since the pressing part 5C of the clamping member 5 and the pressing part 6B of the second clamping member 6 are formed in a tapered shape, the pressing surface 5e and the pressing part 6B of the pressing part 5C are not hindered by the arc-shaped step part 9B. The pressing surface 6e is configured to be able to come into contact with each pressed recessed portion 90. Since the arc-shaped step portion 9B is located on the radially outer side of each pressed recess 90 in a side view, both the pressing surfaces 5e and 6e are positioned on the radially outer side with respect to each pressed recess 90. It functions as a blocking wall that prevents moving away.

Also, for example, although not shown, the opening in the annular protective member R is a pair when the back surface Rr of the annular protective member R is attached in a state where the outer surface 1a, 1a of both flange portions 1A, 1B is in contact. If the head of the connecting bolt 4A or the connecting nut 4B for tightening and connecting the flange portions 1A and 1B is inserted, the configuration such as the circular through hole 8 and the insertion opening 8A described above need to be used. The configuration such as the shape and number can be changed as appropriate.
Further, although not shown, the pressed portion of the annular protection member R is first attached when the back surface Rr of the annular protection member R is attached in contact with the outer surfaces 1a and 1a of both flange portions 1A and 1B. If it is a pressed part formed in the to-be-pressed site | part pressed by the pressing surface 5e of the pressing part 5C in the clamping member 5, or the pressing surface 6e of the pressing part 6B in the 2nd clamping member 6, the above-mentioned pressed recessed part 9 will be mentioned. , 90 need not be configured, and the shape, number, and the like can be changed as appropriate. For example, although not shown, the pressed portion of the annular protective member R is a pressing portion 5C on one side on the surface (surface Rf) opposite to the surface facing the outer surfaces 1a, 1a of the pair of flange portions 1A, 1B. Or in the to-be-pressed site | part pressed by the other press part 6B, it can also form on the same plane as the said surface Rf. In this case, in a direction away from the outer surface 1a of the flange portion 1A or the flange portion 1B in the flange joining direction from the pressed portion at the radially outer side portion of the pressed portion formed on the surface Rf. A protruding step (that is, a protrusion) is formed. This step portion is configured as a blocking wall that prevents the flange joint reinforcing jig P from moving away from the annular protective member R radially outward.
In addition, the number of divisions in the circumferential direction of the annular protective member R may be divided into three or more instead of two.

(B) In the said embodiment, it comprised by the 2nd clamping member provided with the 1st clamping member 5 provided with 5 A of inner fitting parts, and 6 A of outer fitting parts as a pair of clamping members in the flange junction part reinforcement jig | tool P. However, as the pair of sandwiching members, a configuration appropriately changed can be adopted as long as the pair of flange portions 1A and 1B have pressing portions capable of pressing the outer surfaces 1a and 1a separately.
For example, as shown in FIG. 13, the pair of clamping members in the flange joint reinforcing jig P can be configured by a first clamping member 50 and a second clamping member 60.
Specifically, the first clamping member 50 is configured by a substantially U-shaped member having a pair of leg portions 50A and 50B, and the second clamping member 60 is formed by a through female screw hole (fastening means 70) of the leg portion 50B. An example) A bolt (an example of a fastening means 70) 70A provided with a male screw shaft portion 70a that is screwed onto 50a. Moreover, while forming the front-end | tip part of the leg part 50A of the 1st clamping member 5 as the press part 50C, while forming the press surface 50e in the internal peripheral surface of the said press part 50C, the circular shape by using the front-end | tip of the volt | bolt 70A as a press part. The pressing surface 60A is configured. Note that the pressing surface 50e and the pressing surface 60A are located at positions facing each other in the flange joining direction.
And the semicircular division | segmentation protection member R3 divided into two as the cyclic | annular protection member R is employ | adopted. Each division protection member R3 has substantially the same configuration as that of the above-described division protection member R1, but the configuration of the pressed recess (an example of the pressed portion) 91 is different from the configuration of the pressed recess 9. Specifically, the pressed recesses 91 are formed in a circular shape in a side view on the surface Rf of each split protection member R3, and a plurality of pressed recesses 91 are arranged in the circumferential direction. The inner diameter of the circular pressed recess 91 is slightly larger than the outer diameter of the pressing surface 60A formed at the tip of the male screw shaft portion 70a of the bolt 70A.
Thus, the pair of split protection members R3 are mounted in a state where the head of the connecting bolt 4A is inserted into the circular through hole 8 and the back surface Rr is in contact with the outer surface 1a of the flange portion 1B. The bolt 70A is screwed into the penetrating female screw hole 50a in the leg 50B of the 50, and further tightened, whereby the pressing surface 60A of the bolt 70A is brought into contact with the pressed recess 91 and the pressing surface 50e of the leg 50A is flanged. The pair of flange portions 1A and 1B can be clamped and fixed in the flange joining direction by the first clamping member 50 and the second clamping member 60 in contact with the outer surface 1a of the portion 1A.
Further, for example, in the above embodiment, the inner fitting portion 5A in the fitting shape between the inner fitting portion 5A of the first holding member 5 and the outer fitting portion 6A of the second holding member 6, that is, in a cross-sectional view. The outer surface 5a and the inner surface 6b of the outer fitting portion 6A have a substantially square shape, but the relative rotation around the flange joining direction is performed with the inner fitting portion 5A and the outer fitting portion 6A being fitted. If it is configured to be impossible, other fitting shapes can be employed. For example, the shape of the outer surface 5a of the inner fitting portion 5A and the inner surface 6b of the outer fitting portion 6A can be configured in an elliptical shape, a polygonal shape, or the like in a cross-sectional view.

(C) In the above embodiment, the pair of split protection members R1 are mounted so that the heads of the fastening bolts 4A are inserted into the circular through holes 8 and the back surface Rr is in contact with the outer surface 1a of the flange portion 1B. At the same time, another pair of split protective members R1 were mounted such that each fastening nut 4B was inserted into each circular through hole 8 and the back surface Rr was in contact with the outer surface 1a of the flange portion 1A.
However, the pair of split protection members R1 are only connected to either the mounting state in which the back surface Rr of each split protection member R1 is in contact with the outer surface 1a of the flange portion 1B or the mounting state in which the rear surface Ra of the flange portion 1A is in contact. It can also be.

(D) In the said embodiment, although each division | segmentation protection member R1 was set as the structure which carries out fitting connection in the state which overlapped the fitting part 10 and the to-be-fitted part 11, the structure which connects each division | segmentation protection member R1. It can be changed as appropriate.

(E) In the above embodiment, the two flange portions 1A, 1B are connected by the six pairs of connecting bolts 4A and the connecting nut 4B. However, depending on the nominal diameter of the flange portions 1A, 1B, the design pressure, etc. The number of bolts 4A and connecting nuts 4B can be adjusted as appropriate.
Similarly, the thickness of the annular protective member R can be changed as appropriate.

(F) In the above embodiment, the fastening means 7 is constituted by the fastening bolt 7A inserted through the insertion hole 6d of the second clamping member 6 and screwed into the female screw portion 5d and the female screw portion 5d. The configuration of the fastening means 7 can be changed as appropriate.

(G) In the above embodiment, the configuration in which both flange portions 1A and 1B are so-called RF-type flanges has been described. However, as long as the flange joint is used, other flange joints may be used. It is good.

(H) In the above embodiment, the flange joint reinforcing jig P is connected to the flange portions 1A and 1B formed on the cast iron water pipes 1 and 1 which are examples of fluid pipes constituting the fluid piping system (pipe). However, the fluid pipe may be a pipe through which gas or liquid flows.

  As described above, the flange joint reinforcement structure capable of protecting the outer surfaces of the pair of flange portions and improving the durability while preventing the displacement and detachment of the pair of clamping members and maintaining the earthquake resistance, and An annular protective member used for the flange joint reinforcing structure can be provided.

1A Flange 1B Flange 1a Outer side 2 Gasket (annular sealing material)
3 Through-hole 4A Connecting bolt 4a Head 4B Connecting nut 5 First clamping member (clamping member)
5C Pressing part 5d Female thread part (fastening means)
5e Press surface 6 2nd clamping member (clamping member)
6B Pressing part 6e Pressing surface 7 Fastening means 7A Fastening bolt (fastening means)
8 circular through hole (opening)
8A Insertion opening (opening)
9 Pressed recess (pressed part)
9A Step 9B Arc-shaped step (blocking wall)
9a First linear step (step, blocking wall)
9b Second linear step (step, blocking wall)
DESCRIPTION OF SYMBOLS 10 Fitting part 10b Protruding part 11 Fitted part 11b Through-hole part 50 1st clamping member 50C Press part 50a Through female screw hole (fastening means)
50e pressing surface 60 second clamping member 60A pressing surface 70 fastening means 70A bolt (fastening means)
90 Pressed recess (pressed part)
91 Pressed recess (pressed part)
M flange joint reinforcement structure P flange joint reinforcement jig R annular protection member R1 split protection member (annular protection member)
R2 Split protective member (annular protective member)
R3 Split protective member (annular protective member)
Rf Front surface Rr Back surface

Claims (8)

A pair of clamping members each having a pressing part capable of pressing the outer surfaces of a pair of flange parts clamped and connected by a plurality of connecting bolts and connecting nuts arranged in the circumferential direction, and the pressing parts of the pair of clamping members A plurality of flange joint reinforcing jigs are provided on the pair of flange portions. A flange joint reinforcement structure to be attached,
The plate-shaped annular protection member is adjacent to the one side surface of the pair of flange portions and the one side pressing portion of the pair of clamping members, and the pair of flange portions. Among the adjacent sides of the other side of the outer side surfaces of the flange portion and the other side pressing portion of the pressing portions of the pair of clamping members, is interposed between at least one adjacent,
The annular protection member is opposed to the outer surface of the pair of flange portions and the opening portion through which the head portion of the connection bolt or the connection nut can be inserted while being interposed between the at least one adjacent portion. A pressed portion formed in a planned pressed portion to be pressed by the pressing portion on the one side or the pressing portion on the other side on the surface opposite to the surface,
A stepped portion projecting in the flange joining direction from the pressed portion is formed at a radially outer side portion of the pressed portion, and the stepped portion is connected to the annular protective member by the flange joint reinforcing jig. And a flange joint reinforcement structure configured as a blocking wall that prevents the detachment movement to the radially outward side.   A plurality of the pressed parts are formed in the circumferential direction, and stepped parts projecting in the flange joining direction from the pressed parts are formed at both sides in the circumferential direction of the pressed parts. 2. The flange joint reinforcing structure according to claim 1, wherein the flange joint reinforcing jig is configured as a blocking wall that prevents the flange joint reinforcing jig from moving away from the annular protective member in the circumferential direction.   When viewed in the flange joining direction, at least a part of the pressed part is disposed at a portion overlapping with a place where an annular seal material that seals between the opposing surfaces of the pair of flange parts is disposed, and the pressing part on the one side and the other side The flange joint reinforcement structure according to claim 1 or 2, wherein at least one of the side pressing portions is configured to press the portion.   A plurality of the pressed parts are formed in the circumferential direction, each pressed part is arranged between the connection bolt and the connection nut in the circumferential direction, and a plurality of the flange joint reinforcing jigs are arranged in the circumferential direction. The flange joint part reinforcement structure as described in any one of Claims 1-3 arrange | positioned between the connection bolt and the adjacent of the said connection nut. The annular protective member is constituted by a divided protective member divided into a plurality in the circumferential direction, and includes a fitting portion formed at one end portion of each divided protective member and a fitted portion formed at the other end portion,
The fitting part is fitted and connected to the fitted part in a state where the fitting part of the divided protective member and the fitted part of the other divided protective member adjacent to each other overlap in the flange joining direction view. The flange joint part reinforcement structure as described in any one of Claims 1-4.   The fitting portion is a protruding portion that protrudes in the flange joining direction from one end portion of each split protection member, and the through-hole portion in which the fitted portion penetrates in the flange joining direction at the other end portion of each split protection member The flange joint reinforcement structure according to claim 5.   The flange joint reinforcement structure according to any one of claims 1 to 6, wherein the opening is formed in a circular shape into which the head of the connection bolt or the connection nut can be inserted.   The said annular | circular shaped protection member used for the flange junction part reinforcement structure as described in any one of Claims 1-7.

Images