JP6374250B2 - Joining reinforcement jig - Google Patents

Description

  The present invention relates to a reinforcing jig that reinforces a joint portion between projecting portions projecting radially outward from end portions of both cylindrical members.

  As the reinforcing jig, for example, in Patent Document 1, a pair of sandwiching members individually attached to a connection bolt (a bolt and a nut in the document) of a pair of flange joints, and these sandwiching members are outside surfaces of the joints. Among them, a configuration is disclosed that includes a fastening mechanism (a coupling member in the literature) that pulls and fixes both clamping members in the joining direction of the joining portion in a state in which a portion in the radially inward direction is pressed from the connecting bolt. This fastening mechanism is configured by screwing both screw bolts into a pair of bolt screw holes formed in a radially outward direction with respect to the outer peripheral surface of the joint portion of both the clamping members.

  Each of the holding members has a relief hole for allowing the bolt head or nut to escape or a recess for receiving the bolt head or nut. With the above configuration, the reinforcing jig can be attached along the connecting bolt of the joint portion, and therefore it is possible to cope with the reinforcement of the bolt and the aging of the bolt.

Japanese Patent No. 4157413

  By the way, in order to further improve the seismic resistance, existing or new joints are equivalent to seismic ducts based on the technical standards (draft) of underground buried pipe seismic joints (1977, National Land Development Technology Research Center). It is desirable to reinforce both cylindrical members to have a seismic performance class A performance of 3DkN or more (D is a nominal diameter). In addition, even when a tensile force that pulls the joint portion apart in the axial direction or a shearing force that moves the joint portion in the radial direction acts, the separation or misalignment of the joint portion is prevented, and leakage of fluid flowing through the inside is surely prevented. It is desirable. Further, in the case of an aging repair valve or the like, in particular, the connection bolt at the joint between the valve box and the short pipe often causes a decrease in strength due to corrosion. For this reason, it is desirable to reinforce the periphery of the connecting bolt because water may leak from the gap between the joints when the repair valve is replaced, and eventually the joints may be disconnected.

  On the other hand, in the conventional reinforcing jig as in the cited document 1, it is fastened and fixed by both screw bolts screwed over a pair of bolt screw holes, and the pair of clamping members is substantially a pair. It is only fastened and fixed only by the bolt screw hole and both screw bolts. For this reason, when a tensile force or a shearing force is applied to the joint, it is concentrated at the screwed portion between the pair of bolt screw holes and both screw bolts via the pair of clamping members, and both screw bolts extend, There is a possibility that the connection of the joint portion may be disconnected due to destruction of the screw thread at the screwed portion.

  Moreover, the reinforcement jig | tool of patent document 1 is a form which a pair of clamping member which has a relief hole or a recessed part presses the site | part of a radial direction from a connection bolt among the outer surfaces of a junction part. For this reason, if the pipe diameters on both sides of the joint are different, such as the joint between the valve box and the short pipe in the repair valve, and the space in the region radially inward from the connecting bolt is narrow, these clamping members Cannot be inserted into the space. Moreover, since the pressing portion of the clamping member is inserted into the space from the axial direction of the connecting bolt, for example, when a flange to be joined to another member is provided at the end of the repair valve, the flange becomes an obstacle. It is difficult to insert.

  On the other hand, it is also conceivable that only the pressing portion of the clamping member that contacts the joint portion on the valve box side having a large diameter is retracted in the radially outward direction. A force is applied to the connecting bolt. As a result, the connecting bolt may be damaged and water may leak from the joint. In particular, a repair valve that has not been replaced for a long period of time is assumed to have an extremely reduced strength of the connecting bolt, so that it is difficult to cope with the conventional reinforcing jig and there is room for improvement.

  Therefore, an object of the present invention is to rationally configure a reinforcing jig that can reinforce the periphery of the connecting bolt at any joint and can prevent separation and displacement of the joint.

The characteristic structure of the reinforcement jig of the junction part which concerns on this invention protruded in the radial direction from the 1st protrusion part which protruded in the radial direction from the edge part of the 1st cylindrical member, and the end part of the 2nd cylindrical member. A first clamping member that is attached to a joint part joined with a second projecting part with a connecting bolt, and that presses the outer surface of the first projecting part against which the head or nut of the connecting bolt comes into contact; and the second projecting part A second clamping member that presses the outer surface of the first clamping member, and a fastening mechanism that fixes the first clamping member and the second clamping member close to each other in the joining direction of the first projecting portion and the second projecting portion; wherein the first clamping member, in an outer surface of the first projecting portion, the two pressing portions for pressing the regions on both sides of the circumferential front along the direction SL head or the nut of the first tubular member And the first clamping member presses the first protrusion when viewed from the joining direction. The difference between the distance from the center to the center of the first cylindrical member and the distance from the pressing center at which the second clamping member presses the second protrusion to the center of the second cylindrical member is the head Or it is in the point comprised smaller than the radius of the said nut. According to this configuration, since the two pressing portions of the first clamping member are arranged on both sides of the connecting bolt along the circumferential direction, when the reinforcing jig is attached to the joint portion, the two pressing portions are connected to the connecting bolt. It is smoothly inserted along the radial direction so as to sandwich the head or nut. For this reason, compared with the conventional case where the pressing portion is inserted from the axial direction of the connecting bolt, for example, the inconvenience that the flange provided at the end of the repair valve becomes an obstacle is solved. For this reason, compared with the conventional case where the pressing portion is inserted from the axial direction of the connecting bolt, for example, the inconvenience that the flange provided at the end of the repair valve becomes an obstacle is solved. Further, since the two pressing portions are inserted along the radial direction, the reinforcing jig can be surely inserted into the joint portion even when the space inside the radial portion is narrower than the connecting bolt. In addition, since both sides of the connecting bolt are pressed, a large pressing area can be secured, and the reinforcement of the joint portion around the connecting bolt is ensured. In this configuration, the difference between the distance from the center of the cylindrical member at the pressing point of the first clamping member and the distance from the center of the cylindrical member at the pressing point of the second clamping member is the difference between the connection bolt head or the nut. It is smaller than the radius. That is, the pressing action point of the first clamping member and the pressing action point of the second clamping member do not greatly deviate in the radial direction on the basis of the head or nut of the connecting bolt. For this reason, when the space on the inner diameter side of the connecting bolt is narrow and the pressing portion of the first clamping member and the pressing portion of the second clamping member are displaced in the radial direction as in the prior art, the reinforcing jig Inconveniences such as tilting, disengagement, and excessive bending force applied to the connecting bolts to breakage are eliminated. Therefore, the reinforcement work around the connecting bolt at the joint is ensured.

Other construction, when viewed from the front Symbol joining direction lies in that at least a portion of the line segment connecting the pressing center of the two pressing portions are included in the head or the nut. According to this configuration, since the two pressing portions of the first clamping member are arranged on both sides of the connecting bolt along the circumferential direction, when the reinforcing jig is attached to the joint portion, the two pressing portions are connected to the connecting bolt. It is smoothly inserted along the radial direction so as to sandwich the head or nut. For this reason, compared with the conventional case where the pressing portion is inserted from the axial direction of the connecting bolt, for example, the inconvenience that the flange provided at the end of the repair valve becomes an obstacle is solved.

  Further, since the two pressing portions are inserted along the radial direction, the reinforcing jig can be surely inserted into the joint portion even when the space inside the radial portion is narrower than the connecting bolt. In addition, since both sides of the connecting bolt are pressed, a large pressing area can be secured, and the reinforcement of the joint portion around the connecting bolt is ensured.

  Thus, the reinforcement jig | tool which can reinforce the connection bolt circumference in all the junction parts by simple structure was able to be provided.

  Another characteristic configuration is that an insertion portion is formed in one of the first clamping member and the second clamping member at a position radially outward from the outer peripheral surface of the first protrusion, and the other The insertion portion for receiving the insertion portion therein is formed along the joining direction, and the fastening mechanism is to pull the insertion portion and the insertion portion in the joining direction and fix them.

  According to this configuration, when the fastening mechanism is tightened in a state where the pressing portions of the respective sandwiching members are respectively applied to the outer surfaces of the two protruding portions, the insertion portion and the inserted portion are inserted as the both sandwiching members are pulled in the joining direction. And are overlapped in the axial direction.

  As a result, in the state where each clamping member is clamped and fixed by the fastening mechanism, a shearing force that causes the two protruding portions to be displaced in the radial direction is applied, or a tensile force that pulls the two protruding portions apart in the axial direction is applied. Even when the pressing parts of both clamping members receive a force in the opening direction, in addition to the fastening part of the fastening mechanism, these parts also receive the force at the overlapping part of the insertion part and the inserted part. It is possible to reduce the stress applied to the. Therefore, the joint strength of the two protrusions by the reinforcing jig is improved, the separation and displacement of both protrusions and the leakage of the fluid accompanying them are prevented, and the seismic performance is improved. Accordingly, it is possible to reliably prevent separation and displacement of both protrusions while reinforcing the periphery of the connecting bolt.

  In another characteristic configuration, a plurality of jig bodies including the first clamping member, the second clamping member, and the fastening mechanism are arranged along a circumferential direction of the first cylindrical member, and the plurality of jigs are arranged. It is attached to the tool main body and is provided with a band member that restricts the jig main body from moving in the radially outward direction.

  When a shearing direction or tensile direction force acts on the joint, the jig body may move outward in the radial direction and fall off. However, dropping of the jig body is prevented by providing a band member that restricts the movement in the radially outward direction as in this configuration. Therefore, the strength of the joint around the connecting bolt can be ensured over a long period of time.

  In another characteristic configuration, the band member includes an annular hook-shaped portion that contacts the outer surface of the first clamping member or the second clamping member, and an outer surface of the first clamping member or the second clamping member. It has the point which has the outer wall part standingly arranged along the said joining direction from the said hook-shaped part in the position of a radial direction outer side.

  According to this configuration, when the band member is attached to the clamping member, the annular hook-shaped portion may be hooked on the outer surface of the first clamping member or the second clamping member, so that the assembly is easy. In addition, it is efficient because a plurality of jig bodies can be prevented from falling off with a simple configuration in which an annular hook-shaped portion and an outer wall portion are provided. Therefore, although it is a simple structure, the intensity | strength of the junction part around a connection bolt can be ensured over a long period of time.

  In another characteristic configuration, the fastening mechanism has a fastening bolt, and the band member is formed in an annular flat plate shape having a through hole into which the fastening bolt is inserted, and the first clamping member or the second clamping member It exists in the point arrange | positioned between the outer surface of a member, and the head of the said fastening bolt.

  As in this configuration, the band member is firmly fixed by the fastening force of the fastening bolt by providing the annular flat band member between the outer surface of the clamping member and the head of the fastening bolt. As a result, among the plurality of jig bodies arranged along the circumferential direction, even if one of the jig bodies is likely to fall off due to an outward force, it is fixed along the circumferential direction. The band member exhibits a desired resistance and can be reliably prevented from falling off. Moreover, since the band member has an annular flat plate shape, material costs can be saved.

  Another characteristic configuration is that the insertion portion and the insertion target portion are configured such that a cross-sectional shape perpendicular to the joining direction cannot be relatively rotated.

  According to this configuration, since the insertion portion and the insertion portion are engaged with each other in a state in which the insertion portion and the insertion portion are not relatively rotatable, it is possible to prevent relative rotation between the pair of sandwiching members. Thereby, the relative positional relationship between the clamping members can be fixed to a desired positional relationship. Therefore, the fastening operation of the fastening bolt and the mounting operation to the joint portion of the jig body can be easily performed.

It is a disassembled perspective view of both cylindrical members. It is a top view of both cylindrical members. It is a longitudinal cross-sectional view of both cylindrical members. It is a figure which shows schematic structure of a 1st clamping member. It is a figure which shows schematic structure of a 2nd clamping member. It is a perspective view which shows the mounting state of a reinforcement jig. It is a figure which shows schematic structure of both the clamping members. It is a top view which shows the mounting state of a reinforcement jig. It is a longitudinal cross-sectional view which shows the mounting state of a reinforcement jig. It is a top view which shows the pressing state of both clamping members. It is a top view which shows the mounting state of the reinforcement jig | tool which concerns on another Embodiment 1. FIG. It is a longitudinal cross-sectional view which shows the mounting state of the reinforcement jig | tool which concerns on another Embodiment 2. FIG. It is a longitudinal cross-sectional view which shows the mounting state of the reinforcement jig | tool which concerns on other embodiment.

  Below, embodiment of the reinforcement jig | tool P of the junction part which concerns on this invention is described based on drawing. In this embodiment, as an example of the reinforcing jig P, the connecting bolt 4 at the joint portion between the short pipe T (an example of the first cylindrical member) of the repair valve X and the valve box V (an example of the second cylindrical member). A case of reinforcing the above will be described. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the invention.

  1-3, the junction part of the short pipe T and the valve box V is shown. A rectangular first protrusion 1A to which the second protrusion 1B of the valve box V is joined is formed at one end of the cast iron short pipe T so as to protrude radially outward. At the other end of the short pipe T, a disk-like flange portion Ta to which an air valve, a work valve, etc. are attached is formed protruding in the radially outward direction. Further, a rectangular second protrusion 1B to which the first protrusion 1A of the short pipe T is joined is formed at one end of the valve box V made of cast iron so as to protrude radially outward. At the other end of the valve box V, a disk-like flange portion Va to which a water pipe branch pipe or the like is attached is formed extending in the radially outward direction.

  In the first protrusion 1A, a plurality of through holes 3a (four in this embodiment) penetrating in the joining direction (axial direction) are formed at equal intervals in the circumferential direction, and in the second protrusion 1B, The holes 3b (four in this embodiment) whose one ends are closed are formed at equal intervals in the circumferential direction. A female screw portion 3c is formed on the inner peripheral surface of the hole portion 3b, and both the protruding portions 1A and 1B are joined by screwing the male screw portion 4b of the connecting bolt 4 to the closed end surface of the hole portion 3b. ing. That is, as shown in FIGS. 2 to 3, both projecting portions 1 </ b> A and 1 </ b> B are fixed in a state where the connecting bolt 4 is embedded.

  As shown in FIG. 3, a ball valve body Vb is accommodated in the valve box V, and the ball valve body Vb is rotated by an opening / closing operation to switch between communication and non-communication of the flow path. For this reason, the valve box V is configured to have a larger diameter than the short pipe T, and the protruding amounts in the radially outward direction of the protruding portions 1A and 1B are different.

  Hereinafter, in both projecting portions 1A and 1B, the surface on which the short tube T or the valve box V projects is referred to as the outer surface 1a and 1a, and when both projecting portions 1A and 1B are connected by the connecting bolt 4, the joining direction ( The surfaces facing each other in the axial direction, hereinafter referred to as “joining direction”) are referred to as joint surfaces 1b and 1b, and the radially outward surfaces of both protrusions 1A and 1B are referred to as outer peripheral surfaces 1c and 1c. explain.

  As shown in FIG. 6, the reinforcing jig P includes a jig main body Pa that is attached to both projecting portions 1 </ b> A and 1 </ b> B.

  The jig body Pa includes a first clamping member provided with two pressing portions 6B and 6B that press both side regions of the head 4a on the outer surface 1a of the first protrusion 1A with which the head 4a of the connecting bolt 4 abuts. 6 and a second clamping member 5 having a pressing portion 5C that presses the outer surface 1a of the second protruding portion 1B. In addition, a fastening mechanism 7 is provided that draws (closes) the first clamping member 6 and the second clamping member 5 in the joining direction of the projecting portions 1A and 1B. On the pressing surfaces 6e and 5e facing the protruding portions 1A and 1B of the pressing portions 6B and 5C, for example, fine irregularities are formed on the pressing surfaces 6e and 5e, or a rubber member is attached to the surface of the pressing surfaces 6e and 5e. Friction processing is performed so that a frictional resistance is generated on the outer surfaces 1a and 1a of the projecting portions 1A and 1B.

  In addition, although the connection bolt 4 in this embodiment has shown the example of the hexagon bolt which has the head 4a, it is good also as a structure which fastens both screw bolts with a nut (not shown). In this case, the nut comes into contact with the outer side surface 1a of the first projecting portion 1A, and the two pressing portions 6B and 6B of the first clamping member 6 press both side regions of the nut. Further, in the present embodiment, an example of the embedded type connecting bolt 4 is shown, but in the case of a bolt (including both screw bolts) and a nut type connecting bolt 4, On the outer side surface 1a, two pressing portions 5C and 5C for pressing both side regions of the nut may be provided.

  As shown in FIG. 4, the first clamping member 6 is composed of a metal member, and an inserted portion 6A in which an outer surface 6a and an inner surface 6b are formed in a rectangular bottomed rectangular tube shape in a cross-sectional view, One end portion of the portion 6A is integrally provided with two pressing portions 6B and 6B extending in a bifurcated shape from one side of the four sides of the outer surface 6a of the inserted portion 6A toward the outer side. Yes.

  The inserted portion 6A is formed in a square shape in a cross-sectional view (see FIG. 4C), and a second portion, which will be described later, is formed inside the inserted portion 6A along the joining direction of both protruding portions 1A and 1B. A cylindrical internal space 6c that receives the insertion portion 5A of the holding member 5 is formed. That is, as shown in FIG. 6, when the jig body Pa is mounted on both the projecting portions 1A and 1B, the second clamping member 5 is positioned at a position radially outward from the outer peripheral surface 1c of the first projecting portion 1A. An insertion portion 5A is formed, and an insertion portion 6A for receiving the insertion portion 5A therein is formed in the first clamping member 6 along the joining direction.

  The cylindrical internal space 6c is formed in a substantially square shape in a cross-sectional view, and is slightly larger than the outer diameter of the square-shaped insertion portion 5A in a cross-sectional view. For this reason, as shown in FIG. 6, the cross-sectional shape perpendicular to the joining direction of the outer surface 5a of the insertion portion 5A and the inner surface 6b of the insertion portion 6A is such that the insertion portion 5A is formed in the cylindrical internal space 6c of the insertion portion 6A. When inserted, 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.

  In the cylindrical internal space 6c, an opening is formed on the side opposite to the side where the pressing portions 6B and 6B are formed. Further, in the cylindrical internal space 6c, the side where the pressing portions 6B and 6B are formed has an insertion hole 6d through which the male screw portion 7a of the fastening bolt 7A can be inserted and the head portion 7b cannot be inserted. An opening is formed in a state of penetrating through the bottom of the. 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. 9).

  The two pressing portions 6B and 6B are formed in a bifurcated shape having the same arm length in a side view (see FIG. 4A), and are formed in a rectangular shape in a longitudinal sectional view (FIG. 4A). FIG. 4B is a Vb-Vb cross section of FIG. Further, of the two pressing portions 6B and 6B, the tip end portion on the opening side of the cylindrical internal space 6c is formed as pressing surfaces 6e and 6e perpendicular to the outer surface 6a of the inserted portion 6A.

  As shown in FIG. 8, the two pressing portions 6B and 6B press the regions on both sides of the head 4a of the connecting bolt 4 along the circumferential direction of the short tube T on the outer surface 1a of the first projecting portion 1A. It is configured. That is, the two pressing portions 6B and 6B extend from the outer surface 6a of the inserted portion 6A toward the outer side while maintaining a distance larger than the outer diameter of the head 4a of the connecting bolt 4, and accommodate the head 4a. A U-shaped head accommodating portion 6f is formed. When both the clamping members 6 and 5 are attached to the two projecting portions 1A and 1B from the radially outward direction, the two pressing portions 6B and 6B are the first projecting portions in a state where the head housing portion 6f is not in contact with the head 4a. The outer surface 1a of 1A will be pressed.

  As shown in FIG. 5, the second clamping member 5 is made of a metal material, and has an insertion portion 5A formed in a bottomed rectangular tube shape in which the outer surface 5a is square and the inner peripheral surface 5b is circular in a cross-sectional view. And a hook-like portion 5B extending outward from the outer surface 5a of the insertion portion 5A at one end of the insertion portion 5A, and further outward from one side of the four sides of the hook-like portion 5B. And a pressing portion 5 </ b> C extending in a single body.

  The insertion portion 5A is formed in a square shape in a cross-sectional view (see FIG. 5C), and a cylindrical cylindrical inner space 5c into which the male screw portion 7a of the fastening bolt 7A can be inserted is formed. ing. 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 square shape in a side view, and a cylindrical internal space 5c is formed through the central part (see FIG. 5A).

  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. An internal thread portion 5d to which the portion 7a can be screwed is formed so as to penetrate the bottom of the insertion portion 5A. That is, the female screw portion 5d is formed at the end on the opposite side of the inner peripheral surface 5b of the cylindrical inner space 5c in the insertion portion 5A from the side on which the flange portion 5B and the pressing portion 5C are formed.

  The pressing portion 5C is formed in a slightly tapered shape in a side view (see FIG. 5A), and is formed in a tapered shape that inclines toward the female screw portion 5d as it goes to the distal end side in a longitudinal sectional view (see FIG. 5A). FIG. 5B is a cross-sectional view taken along line IVb-IVb in FIG. In addition, the tip portion of the surface on the female screw portion 5d side of the pressing portion 5C is formed as a pressing surface 5e perpendicular to the outer surface 5a of the insertion portion 5A.

  As shown in FIGS. 9 to 10, when viewed from the joining direction of both projecting portions 1 </ b> A and 1 </ b> B, the pressing centers K <b> 1 and 2 pressing portions 6 </ b> B and 6 </ b> B of the first clamping member 6 press the first projecting portion 1 </ b> A. The distance R1 from K2 to the center Ot of the short tube T (the distance R1 from the line segment connecting the pressing centers K1, K2 to the center Ot of the short tube T) and the pressing portion 5C of the second clamping member 5 are the second projecting portions. The difference (| R1−R2 |) from the pressing center K3 that presses 1B to the center Ov of the valve box V is smaller than the radius r of the head 4a of the connecting bolt 4.

  That is, the line segment connecting the pressing centers K1 and K2 of the two pressing portions 6B and 6B passes through the vicinity of the axial center of the connecting bolt 4, and the pressing center K3 of the pressing portion 5C is joined to the protruding portions 1A and 1B. When viewed from the direction, it is included in the region of the head 4 a of the connecting bolt 4. As a result, the pressing centers K1 and K2 of the two pressing portions 6B and 6B and the pressing center K3 of the pressing portion 5C are separated from the pressing region in which the head 4a of the connecting bolt 4 presses the outer surface 1a of the first projecting portion 1A. There is no separation in the direction. Therefore, a bending force that hinders the fastening force of the connecting bolt 4 does not act on the connecting bolt 4, and damage to the connecting bolt 4 can be prevented.

  On the other hand, even when the line segment connecting the pressing centers K1 and K2 of the two pressing portions 6B and 6B does not pass through the vicinity of the axis of the connecting bolt 4, when viewed from the joining direction of the two protruding portions 1A and 1B, at least It is preferable that a part of this line segment and the pressing center K3 of the pressing portion 5C are included in the region of the head 4a of the connecting bolt 4. In addition, when the 2nd clamping member 5 has two press part 5C, 5C, when it sees from the joining direction of both protrusion part 1A, 1B, the line segment which connected the press center of two press part 5C, 5C It is preferable that at least a part is included in the region of the head 4 a of the connecting bolt 4.

  As shown in FIGS. 6 and 9, the fastening mechanism 7 includes the above-described fastening bolt 7A inserted into the cylindrical inner space 6c from the outside of the inserted portion 6A through the insertion hole 6d, and the inside of the inserting portion 5A. It is comprised from the internal thread part 5d formed in the surrounding surface 5b. The fastening bolt 7A has a male screw portion 7a and a circular head portion 7b in which a hexagonal hole is formed. The head 7b of the fastening bolt 7A is not limited to a hexagonal hole, but may be a polygonal hole. The hexagonal hole is not provided inside, and the outer shape is formed in a polygonal shape such as a hexagonal shape. May be.

  As shown in FIG. 8, since both projecting portions 1 </ b> A and 1 </ b> B are joined by a plurality of connecting bolts 4, a plurality of jig main bodies Pa are mounted along the circumferential direction of the short tube T or the valve box V. It becomes. For this reason, when a shearing direction or tensile force is applied to the joint between the projecting portions 1A and 1B, the jig body Pa may move downward in the radial direction and then drop off downward in the joining direction.

  Therefore, as shown in FIGS. 8 to 9, the reinforcing jig P of the present embodiment is a band that regulates the movement of the plurality of jig bodies Pa attached to the projecting portions 1 </ b> A and 1 </ b> B in the radially outward direction. A member Pb is provided. The band member Pb is made of a metal material, and has a ring-shaped flange portion 21 that contacts the outer surface 6g of the first clamping member 6 and a radially outer position of the outer surface 6g of the first clamping member 6 And an annular outer wall portion 22 erected from the shape portion 21 in the joining direction.

The hook-shaped portion 21 is placed on the outer surface 6g of the first clamping member 6 and positioned in the joining direction.
Moreover, the outer wall part 22 has the bulging part 22a which bulged the to-be-inserted part 6A of the 1st clamping member 6 in the diameter direction at the front end side. The bulging portion 22a presses the outer surface 6a of the insertion portion 6A in the radially inward direction, thereby restricting the jig body Pa from moving in the radially outward direction.

  Furthermore, the band member Pb is divided into two in the circumferential direction, and is formed to have an annular shape by fastening both ends of each of the divided band members 25 and 25 with bolts 23 and nuts 24. For this reason, the bulging portion 22a applies a desired pressing force to the outer surface 6a of the inserted portion 6A by the fastening force of the bolt 23 and the nut 24, and the jig body Pa is prevented from moving in the radially outward direction. doing. Note that the connection between the divided band members 25 and 25 is not limited to the bolt 23 and the nut 24, and a female screw portion may be provided on one of the divided band members 25 and the bolts may be screwed together. Moreover, it is good also as a form which fits into the outer surface 6a of 6 A of to-be-inserted parts as one member, without making the band member Pb into two members, and may comprise three or more members.

  Further, the annular hook-shaped portion 21 abuts against the outer surface 6 g of the first clamping member 6, thereby preventing the band member Pb from dropping from the jig body Pa. In the present embodiment, the head 7b of the fastening bolt 7A is configured in a circular shape with a hexagonal hole, so that the hook-like portion 21 of the band member Pb is always closer to the head 7b of the fastening bolt 7A than the hexagon bolt. Can be installed. As a result, it is possible to secure a contact area with the outer side surface 6g of the first clamping member 6, and the band member Pb is difficult to drop off from the jig body Pa. Note that the hook-shaped portion 21 is not limited to an annular shape, and may be configured in a rectangular shape with an outer surface formed in a polygonal shape, or the outer wall portion 22 is not formed in an annular shape, and a place where the jig body Pa is located. It may be provided only in Moreover, you may form the some notch part which accommodates the head 7b of fastening bolt 7A inside the radial direction of the bowl-shaped part 21. As shown in FIG.

  Next, an operation process in which the reinforcing jig P is attached to the joint portion between the projecting portions 1A and 1B connected by the plurality of connecting bolts 4 will be described.

  As shown in FIG. 6, the insertion portion 5 </ b> A of the second clamping member 5 is connected to the insertion portion 6 </ b> A of the first clamping member 6 at a position radially outer than the outer peripheral surfaces 1 c and 1 c of both protrusions 1 </ b> A and 1 </ b> B. It inserts in the cylindrical interior space 6c along a joining direction. At that time, since the outer surface 5a of the insertion portion 5A and the inner surface 6b of the insertion portion 6A are formed in a square shape that is not relatively rotatable in a cross-sectional view, the pressing portion 5C of the second clamping member 5 and the first clamping member It can be easily inserted in a state where the 6 pressing portions 6B are positioned in a desired relative positional relationship extending in the same direction.

  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. At this time, as shown in FIG. 7, in a state where the insertion portion 5A and the inserted portion 6A are engaged, the pressing portion 5C of the second clamping member 5, the outer surface 5a of the insertion portion 5A, and the A U-shaped recess is formed by the two pressing portions 6B and 6B of the one clamping member 6 and the outer surface 6a of the inserted portion 6A. When this recess is mounted on both projecting portions 1A and 1B, the outer surface 6a of the inserted portion 6A is brought into contact with at least one of the outer peripheral surfaces 1c and 1c of both projecting portions 1A and 1B. That is, the outer surface 6a of the inserted portion 6A functions as a mounting restricting portion that restricts the set mounting position by contacting the outer peripheral surfaces 1c and 1c of the projecting portions 1A and 1B. As a result, the jig body Pa is positioned with respect to both the projecting portions 1A and 1B, so that the mounting operation is easy.

  The engagement between the insertion portion 5A and the insertion portion 6A and the temporary fixing of the fastening bolt 7A are temporarily performed in the joining direction by pressing the pressing surface 5e of the pressing portion 5C of the second clamping member 5 and the pressing portion of the first clamping member 6. The distance between 6B and the pressing surface 6e is set to be slightly larger than the distance between the outer surface 1a of the first protrusion 1A and the outer surface 1a of the second protrusion 1B. That is, the size (insertion distance) of the overlapping portion between the insertion portion 5A and the insertion portion 6A in the joining direction and the interval between the pressing surface 5e and the pressing surface 6e can be appropriately set. For this reason, even when the wall thickness is changed according to the nominal diameter or design pressure of both projecting portions 1A and 1B, the second clamping member 5 and the first clamping member 6 can be adjusted by adjusting the size of the overlapping portion. It is possible to satisfactorily fasten and fix both the projecting portions 1A and 1B.

  Subsequently, after mounting the concave portion at the set mounting position, the outer surface 6a of the inserted portion 6A on the side where the pressing portion 6B extends extends radially outwardly to at least one of the outer peripheral surfaces 1c, 1c of both projecting portions 1A, 1B. Abut. In this state, the pressing surfaces 6e of the two pressing portions 6B, 6B of the first clamping member 6 are brought into contact with the outer surface 1a of the first protruding portion 1A, and the pressing surface of the pressing portion 5C of the second clamping member 5 The insertion portion 5A and the inserted portion 6A are pulled in the joining direction until 5e is brought into contact with the outer surface 1a of the second protruding portion 1B on both sides of the connecting bolt 4.

  Next, the male screw portion 7a of the fastening bolt 7A is screwed into the female screw portion 5d of the insertion portion 5A inserted in the cylindrical inner space 6c, so that the head portion 7b of the fastening bolt 7A is outside the inserted portion 6A. This is fixed until it abuts against the side surface 6g. At this time, the fastening bolt 7A is located on the radially outer side from the flanges Ta and Va of the short tube T and the valve box V, so that the fastening operation is easy. In addition, it is good also as only this fixing, without performing temporary fixing of the fastening bolt 7A mentioned above.

  When the fastening bolt 7A is fastened and fixed, the insertion portion 5A is inside the inserted portion 6A while the pressing portions 6B and 5C of the holding members 6 and 5 are in contact with the outer surfaces 1a and 1a of the protruding portions 1A and 1B. The inserted portion 5A and the inserted portion 6A are overlapped in the joining direction. For this reason, when a shearing force that causes the two protruding portions 1A and 1B to be displaced in the radial direction is applied, or when a tensile force that separates the two protruding portions 1A and 1B in the axial direction is applied, both pressing members 6 and 5 are pressed. Even when 6B and 5C receive a force in the opening direction, in addition to the fastening portion of the fastening mechanism 7, these forces are also received at the overlapping portion of the insertion portion 5 </ b> A and the inserted portion 6 </ b> A. It is possible to reduce the stress applied to the.

  In addition, as shown in FIG. 9, in the state of being tightened and fixed, the female screw portion 5d of the insertion portion 5A is located at a position close to the head 7b of the fastening bolt 7A. The screwed portion of the 7A male screw portion 7a is close to a position where the head 7b of the fastening bolt 7A contacts the outer surface 6g of the inserted portion 6A. That is, the distance between the head 7b of the fastening bolt 7A and the screwed portion in the joining direction is relatively small. Thereby, even when a shearing force or a tensile force acts on both protrusions 1A and 1B, it is possible to satisfactorily prevent the fastening bolt 7A from being stretched or broken.

  Further, since the female screw portion 5d is positioned at the overlapping portion of the insertion portion 5A and the insertion portion 6A in the cylindrical inner spaces 5c and 6c, the length of the fastening bolt 7A can be made relatively short. It becomes. Therefore, it can prevent well that the front-end | tip of fastening bolt 7A protrudes outside the cylindrical interior spaces 5c and 6c. In addition, in the present embodiment, the arrangement location of the insertion portion 5A and the insertion portion 6A at the radially outer positions of the outer peripheral surfaces 1c, 1c of the both projections 1A, 1B is shared with the arrangement location of the fastening bolt 7A. doing. As a result, both the dimension in the joining direction and the dimension in the radial direction of the jig main body Pa and the fastening bolt 7A attached to both the projecting portions 1A and 1B can be reduced, and space saving can be achieved. it can.

  Further, in a state where 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. For this reason, even if a force in the shearing direction (radial direction) acts on both protrusions 1A and 1B and the fastening bolt 7A is slightly displaced in the radial direction, the male screw portion 7a of the fastening bolt 7A is inserted into the insertion hole. It is possible to prevent the fastening bolt 7A from being stretched or broken without coming into contact with 6d.

  Next, after mounting the jig body Pa, another jig body Pa is sequentially mounted from the radially outward direction to all the other connecting bolts 4 in the projecting portions 1A and 1B. Next, as shown in FIG. 8, the split band members 25, 25 are brought close to the plurality of jig main bodies Pa from the radially outer side, and the hook-shaped portion 21 is hooked on the outer surface 6 g of the inserted portion 6 </ b> A. Both ends are fastened and fixed with bolts 23 and nuts 24. At this time, as shown in FIG. 9, the jig body Pa is prevented from moving in the radially outward direction by contacting the bulging portion 22a of the band member Pb and the outer surface 6a of the inserted portion 6A. .

  In the present embodiment, a gap is provided between the bulging portion 22a and the bowl-shaped portion 21 between the outer wall portion 22 and the outer surface 6a of the inserted portion 6A. For this reason, when the divided band members 25, 25 are tightened and fixed, the tightening force is effectively transmitted to the bulging portion 22a, and the jig body Pa is pressed in the radial direction. In addition, the bulging portion 22a is provided at a position overlapping with the protruding portions 1A and 1B in the radial direction, and the inserting portion 5A and the inserted portion 6A are bulged portion 22a and the protruding portions 1A and 1B. Are sandwiched along the radial direction between the outer peripheral surfaces 1c and 1c. Therefore, even when shearing force acts on both projecting portions 1A and 1B and the inserted portion 6A in contact with the outer peripheral surfaces 1c and 1c tends to be separated in the radial direction, the bulging portion 22a can be pressed as desired. The force can be exerted to prevent the jig body Pa from falling off.

  In this way, by attaching the reinforcing jig P to the repair valve X, it is possible to reliably reinforce the joint portion of both the projecting portions 1A and 1B, particularly around the connecting bolt 4. At this time, the bifurcated pressing portions 6B and 6B are provided on the first clamping member 6, so that the jig can be used even when the space on the radially inner portion of the outer surface 1a of the first projecting portion 1A is narrower than the connecting bolt 4. The main body Pa can be easily mounted from the radially outward direction. Moreover, since the two pressing portions 6B and 6B are located on both sides of the connecting bolt 4, it is possible to ensure a wide pressing area. In addition, as described above, the two pressing portions 6B and 6B of the first holding member 6 press the pressing centers K1 and K2 that press the first protruding portion 1A, and the pressing portion 5C of the second holding member 5 is the second protruding portion. By placing the pressing center K3 that presses 1B in the vicinity of the head 4a of the connecting bolt 4, the load on the connecting bolt 4 can be reduced.

By the way, when the repair valve X is replaced, a work valve is attached to the flange portion Ta of the short pipe T, and equipment for closing the connection port between the water main pipe and the branch pipe is attached to the work valve, and the repair valve X is fluidized. Will not be bypassed. During this work process, a large load or bending stress is propagated from these connecting devices to both projecting portions 1A and 1B of the repair valve X, and there is a risk of breaking when subjected to fluid pressure.
In order to avoid such a state, it is meaningful to reinforce both protrusions 1A and 1B with the reinforcing jig P as described above.

[Another embodiment 1]
Hereinafter, another embodiment 1 according to the present invention will be described with reference to FIG. 11 only for a configuration different from the above-described embodiment. In addition, in order to make an understanding of drawing easy, it demonstrates using the same name and code | symbol to the same member.

  In this embodiment, the band member Pb is disposed between the outer surface 6g of the first clamping member 6 and the head 7b of the fastening bolt 7A, and has an annular flat plate shape having a through hole 8 into which the fastening bolt 7A is inserted. Is formed.

  Even in this case, since the band member Pb is firmly fixed to the fastening force of the fastening bolt 7A, even if a plurality of jig bodies Pa arranged along the circumferential direction are likely to move in the radially outward direction, the circumferential direction The band member Pb fixed along the surface exhibits a desired resistance and can be prevented from falling off. In addition, it is good also as a form which divides | segments the band member Pb in this embodiment, and couple | bonds several division | segmentation band members. As a coupling form, a form in which a recessed part and a convex part are formed and engaged with both ends of the split band member, a form in which a folded part is formed and engaged, and the like are conceivable.

[Another embodiment 2]
Hereinafter, another embodiment 2 according to the present invention will be described with reference to FIG. 12 only for a configuration different from the above-described embodiment. In addition, in order to make an understanding of drawing easy, it demonstrates using the same name and code | symbol to the same member.

  In the present embodiment, the second holding member 50 is constituted by a U-shaped member having a pair of leg portions 50A and 50B, and the first holding member 60 is formed through two penetrating females formed on the leg portion 50B. It is composed of two bolts 70A and 70A each having a male screw shaft portion 70a screwed into the screw hole 50a. The two bolts 70A and 70A serving as the first clamping member 60 are the fastening mechanism 70 that fixes the head 70b of the bolt 70A and the second clamping member 50 close to each other in the joining direction of the projecting portions 1A and 1B. Also works. The first clamping member 60 has two pressing portions 60B and 60B that press the regions on both sides along the circumferential direction of the head 4a of the connecting bolt 4 in the outer surface 1a of the first projecting portion 1A. The two clamping members 50 have a pressing portion 50C that presses the outer surface 1a of the second protruding portion 1B at the tip of the leg portion 50A.

  Also in this embodiment, the pressing center 60B and 60B of the 1st clamping member 60 press the 1st protrusion part 1A, and the pressing part 5C of the 2nd clamping member 5 presses the 2nd protrusion part 1B. By placing the pressing center in the vicinity of the head 4 a of the connection bolt 4, the load applied to the connection bolt 4 can be reduced.

  Moreover, in this embodiment, the band member Pb which concerns on another Embodiment 1 is employ | adopted. The band member Pb is disposed between the outer surface of the leg portion 50B of the second clamping member 50 and the head portion 70b of the bolt 70A. Therefore, since the band member Pb is firmly fixed to the fastening force of the bolt 70A, even if the plurality of jig main bodies Pa arranged along the circumferential direction are likely to move in the radially outward direction, the band member Pb is aligned along the circumferential direction. The fixed band member Pb can exhibit a desired resistance and prevent the dropping.

  In addition, instead of the band member Pb according to the different embodiment 1, at the position on the radially outer side of the annular hook-shaped portion that contacts the outer surface of the second clamping member 50 and the outer surface of the second clamping member 50, You may use the band member Pb which has the annular | circular shaped outer wall part standingly arranged along a joining direction from a collar-shaped part.

[Other Embodiments]
(1) In the above-described embodiment, the example in which the reinforcing jig P is attached to both the projecting portions 1A and 1B of the repair valve X is shown. However, around the fastening bolts such as the connection flange between the fluid devices and the connection flange between the pipes It may be used to reinforce. In this case, the connection flange protruding in the radially outward direction from the end of the cylindrical member corresponds to both the protruding portions 1A and 1B in the above-described embodiment.
(2) The shapes of the two pressing portions 6B and 6B of the first clamping member 6 and the pressing portion 5C of the second clamping member 5 can be changed as appropriate. For example, the two pressing portions 6B, 6B of the first clamping member 6 may have a bifurcated shape in which the tip ends are enlarged to ensure a large contact area with the first projecting portion 1A. In this case, the reinforcing jig P is more stable. Moreover, the pressing part 5C of the second clamping member 5 may form a convex part that engages with the concave part of the outer surface 1a of the second projecting part 1B, or the diameter of the tip part may be increased.
(3) In the above-described embodiment, the second clamping member 5 is provided with the insertion portion 5A, and the first clamping member 6 is provided with the insertion portion 6A. However, the second clamping member 5 is provided with the insertion portion. The first clamping member 6 may be provided with an insertion portion.
(4) In the above-described embodiment, the shapes of the insertion portion 5A of the second clamping member 5 and the insertion portion 6A of the first clamping member 6 are square in the cross-sectional view, but the insertion portion 5A and the insertion portion Any shape may be used as long as 6A is inserted and the relative rotation around the joining direction is impossible. For example, it can be configured in an elliptical shape, a polygonal shape, or the like in a cross-sectional view. In addition, you may comprise the shape of 5 A of insertion parts, and the insertion part 6A circularly in cross sectional view.
(5) The structure of the 1st clamping member 6, the 2nd clamping member 5, and the fastening mechanism 7 in embodiment mentioned above can be changed suitably. For example, as shown in FIG. 13, the insertion portion 51 </ b> A of the second clamping member 51 is configured in a rectangular bar shape having an outer diameter that can be inserted into the insertion portion 61 </ b> A of the first clamping member 61. The inserted portion 61A is formed in a cylindrical shape. A bolt 52 having a male threaded portion 52a is formed on the distal end side of the insertion portion 51A so as to protrude in the joining direction, and the fastening nut is fitted in the insertion portion 61A so as not to be relatively rotatable. It is good also as a structure screwed until 53 contact | abuts to the outer surface side from the outer side of 61 A of to-be-inserted parts.
(6) The connecting bolt 4 that connects the projecting portions 1A and 1B in the above-described embodiment is not limited to a hexagon bolt or a screw bolt, and may take any form such as a hexagon socket head bolt.

  The joint reinforcing jig according to the present invention can be used as a jig for reinforcing a joint between a fluid device, a fluid device and a pipe, a fluid device, or a pipe.

DESCRIPTION OF SYMBOLS 1A 1st protrusion part 1B 2nd protrusion part 1a Outer side surface 4 Connection bolt 4a Head part 5 2nd clamping member 5A Insertion part 5C Press part 6 First clamping member 6A Insertion part 6g Outer side surface 7 Fastening mechanism 7A Fastening bolt 7b Head Part 21 flange-like part 22 outer wall part K1, K2 pressing center K3 for pressing the first protruding part pressing center P for pressing the second protruding part reinforcement jig Pa jig body Pb band member T short pipe (first tubular member )
V Valve box (second cylindrical member)

Claims (8)

Attach to the joint where the first projecting part projecting radially outward from the end of the first cylindrical member and the second projecting part projecting radially outward from the end of the second tubular member are joined with a connecting bolt And
A first clamping member that presses the outer surface of the first projecting portion with which the head or nut of the connecting bolt contacts;
A second clamping member that presses the outer surface of the second protrusion,
A fastening mechanism for fixing the first clamping member and the second clamping member close to each other in the joining direction of the first projecting portion and the second projecting portion,
Wherein the first clamping member, in an outer surface of the first projecting portion, has the two pressing portions for pressing the regions on both sides of the circumferential front along the direction SL head or the nut of the first tubular member ,
When viewed from the joining direction, the distance from the pressing center at which the first clamping member presses the first protruding portion to the center of the first cylindrical member, and the second clamping member at the second protruding portion. The difference between the pressing center to be pressed and the distance from the center of the second cylindrical member is a reinforcing jig for the joint portion configured to be smaller than the radius of the head or the nut. When viewed from the front Symbol welding direction, reinforcement jigs joint of claim 1 wherein at least a portion of the line segment connecting the pressing center of the two pressing portions are included in the head or the nut . An insertion portion is formed in one of the first clamping member and the second clamping member at a position radially outward from the outer peripheral surface of the first protrusion, and the other is along the joining direction. An insertion portion for receiving the insertion portion therein is formed,
The said fastening mechanism is a reinforcement jig | tool of the junction part of Claim 1 or 2 which draws and fixes the said insertion part and the said to-be-inserted part to the said joining direction. A plurality of jig bodies composed of the first clamping member, the second clamping member and the fastening mechanism are arranged along the circumferential direction of the first cylindrical member,
The joint reinforcing jig according to claim 3, further comprising a band member attached to the plurality of jig main bodies and restricting the jig main body from moving in the radially outward direction.   The band member includes a ring-shaped hook-shaped portion that contacts the outer surface of the first clamping member or the second clamping member, and a radially outer position of the outer surface of the first clamping member or the second clamping member. The reinforcing jig for the joint portion according to claim 4, further comprising an outer wall portion erected along the joining direction from the flange-like portion. The fastening mechanism has a fastening bolt,
The band member is formed in an annular flat plate shape having a through hole into which the fastening bolt is inserted, and is disposed between the outer surface of the first clamping member or the second clamping member and the head of the fastening bolt. The reinforcing jig for a joint portion according to claim 4.   The reinforcing jig for a joint part according to any one of claims 3 to 6, wherein the insertion part and the insertion part are configured so that a cross-sectional shape perpendicular to the joining direction cannot be relatively rotated.   The joint reinforcing jig according to claim 3, wherein an outer surface of the inserted portion is in contact with an outer peripheral surface of the first protruding portion.

Images