JP6908239B2 - Joint reinforcement jig - Google Patents

Description

The present invention relates to a reinforcing jig for reinforcing a joint portion between flange portions protruding outward from the end portions of both tubular members.

As the reinforcing jig, for example, in Patent Document 1, a pair of holding members having pressing portions that separately contact the flange joints of the pair of pipes (cylindrical members) and both holding members in the joining direction of the joints. A configuration including a fastening mechanism for pulling and fixing the flange is disclosed.

Further, one holding member is formed with a C-shaped dropout prevention arm that abuts from the inside toward the outer diameter to the head or nut of the connecting bolt connecting the two flange portions. The fall-out prevention arm prevents the reinforcing jig from falling off from both flange portions.

Japanese Unexamined Patent Publication No. 2014-141995

By the way, when reinforcing the joints between the flanges, it is necessary to satisfy the detachment prevention force of 3DkN (D is the nominal diameter (outer diameter dimension of the pipe)) defined as the seismic joint standard. This detachment prevention force is required to be as large as 1500 kN in the case of a pipe having a nominal diameter of 500 mm, for example.

On the other hand, the number of heads or nuts of the connecting bolts connecting the two flanges is determined for each size of the flanges, and the number of reinforcing jigs to be installed connected to the heads or nuts of the connecting bolts is limited. Therefore, even if the reinforcing jig is installed to the maximum extent, there is a possibility that the desired detachment preventing force cannot be satisfied for the large-diameter pipe joint. Further, even if an attempt is made to further install a reinforcing jig between the respective connecting bolts, the distance between the respective connecting bolts is narrow and the reinforcing jig cannot be installed.

Therefore, there is a demand for a joint reinforcing jig capable of satisfying a desired detachment prevention force even for a large-diameter flange joint.

The characteristic configuration of the reinforcing jig for the joint is that the first flange portion protrudes outward from the end of the first tubular member and the second flange portion protrudes outward from the end of the second tubular member. A first pressing portion that is mounted on a joint portion joined with a connecting bolt and presses an outer surface in a joining direction of the first flange portion on which the head or nut of the connecting bolt is arranged, and the second flange portion. The fastening mechanism includes a second pressing portion that presses the outer surface of the surface, and a fastening mechanism that fixes the first pressing portion and the second pressing portion in close proximity to each other in the joining direction. It has a mechanism and a second fastening mechanism provided adjacent to the first fastening mechanism.

In this configuration, when the fastening mechanism is tightened when the reinforcing jig is fixed to the flange joint portion, the first flange portion and the second flange portion move in the proximity direction to each other due to the tightening force of the fastening mechanism. As a result, the connecting bolt can be further tightened, and the tightening torque for the flange joint can be increased. By alternately tightening these fastening mechanisms and connecting bolts, a detachment prevention force is obtained for the flange joint.

Further, the fastening mechanism in this configuration has a first fastening mechanism and a second fastening mechanism provided adjacent to the first fastening mechanism. Therefore, the tightening torque for the flange joint of the fastening mechanism can be further increased. As a result, even if the flange joint has a large diameter, the detachment prevention force can be enhanced. As described above, it has been possible to provide a joint reinforcing jig capable of satisfying a desired detachment prevention force even for a large-diameter flange joint.

Another characteristic configuration is that the first fastening mechanism has a first bolt, the second fastening mechanism has a second bolt, the head or nut, the first bolt and the said. The point is that the outer diameter dimension and the outer diameter shape of the head of the second bolt are the same.

If the head or nut of the connecting bolt, the outer diameter dimension and the outer diameter shape of the head of the first bolt and the second bolt are the same as in this configuration, a ratchet wrench or the like for increasing the tightening torque, etc. Can also be used as a tightening tool.

Another characteristic configuration includes a pair of holding members having the first pressing portion and the second pressing portion separately, and one of the holding members is radially outside the outer peripheral surface of the first flange portion. A bottomed tubular insertion portion to be inserted from the joining direction is formed at the position of, and a bottomed tubular insertion portion for receiving the insertion portion is formed in the other sandwiching member. The first fastening mechanism is formed on a first bolt including a first head located outside the bottom portion of the inserted portion and an end portion of the insertion portion on the side to be inserted. The second fastening mechanism has a first female screw portion through which the bolt is screwed, and the second fastening mechanism includes a second bolt including a second head located outside the bottom portion of the inserted portion and the insertion portion. It has a second female threaded portion formed at the end portion on the side to be inserted portion and into which the second bolt is screwed, and the bottom portion of the inserted portion has the second head portion. The point is that the step portion is formed so that the height is lower than the height of the first head.

By providing the insertion part and the inserted part as in this configuration, when a shearing force that shifts the positions of both flanges in the radial direction acts, or a tensile force that pulls both flanges apart in the axial direction acts on both. Even when the pressing portion of the holding member receives a force in the opening direction, these forces are received at the overlapping portion between the insertion portion and the inserted portion, so that the stress applied to the fastening portion of the fastening mechanism is dispersed. As a result, the durability of the reinforcing jig can be improved.

Further, in this configuration, since a step portion is provided at the bottom of the inserted portion so that the second head of the second bolt is lower than the first head of the first bolt, it is installed at the flange joint. Of a plurality of reinforcing jigs, between the first bolt of one reinforcing jig and the first bolt of another reinforcing jig adjacent to one reinforcing jig, from the first head of the first bolt. A second bolt with a lower second head will be located. Therefore, when the connecting bolts of both flanges are tightened by the tightening tool, the rotation range of the tightening tool can be increased without the tightening tool being caught by the second head. Therefore, the tightening work of the connecting bolt for obtaining the desired tightening torque is easy.

Another characteristic configuration is that the first head and the second head are set to have the same distance from the outer peripheral surface of the first flange portion.

In this configuration, the first head of the first bolt and the second head of the second bolt are set to have the same distance from the outer peripheral surface of the first flange portion, so that the tightening torques of both bolts are both. It acts evenly on both pressing portions that press the outer surface of the flange portion. As a result, the force for preventing detachment from the flange joint can be surely increased.

Another characteristic configuration is that the pair of sandwiching members is made of a metal material.
The end of the insertion portion on the side to be inserted is at a point where the space between the first female screw portion and the second female screw portion is filled with the metal material.

In this configuration, since the space between the first female threaded portion and the second female threaded portion is filled with a metal material, even if a large tightening torque of both bolts acts on both female threaded portions, the insertion portion is prevented from being damaged. Can be done.

Another feature configuration further comprises a fall-prevention arm that extends from the base of the first pressing portion and abuts on the head or nut from the inside toward the out-of-diameter direction, wherein the fall-prevention arm is said. The point is that at least the thickness of the edge portion in contact with the head or nut is set to be smaller than that of other parts so that the head or nut retreats in the joining direction.

In this configuration, the thickness of at least the edge of the fall prevention arm that comes into contact with the nut or the like is set small so that the fall prevention arm retreats with respect to the nut or the like in the flange joining direction. That is, the height of the fall prevention arm is set smaller than the height of the nut or the like around the nut or the like. Therefore, when tightening the nut or the like, the tightening tool can be reliably inserted around the nut or the like.

It is an exploded perspective view of both tubular members. It is a top view of both tubular members. It is a vertical sectional view of both tubular members. It is a figure which shows the schematic structure of the 1st holding member which concerns on 1st Embodiment. It is a figure which shows the schematic structure of the 2nd holding member which concerns on 1st Embodiment. It is sectional drawing in the IV-IV line of FIG. 4 and the VV line of FIG. 5 of the reinforcing jig. It is a perspective view which shows the mounting state of the reinforcing jig which concerns on 1st Embodiment. It is an enlarged plan view which shows the mounting state of the reinforcing jig which concerns on 1st Embodiment. It is an enlarged plan view which shows the state which fastens the connecting bolt which concerns on 1st Embodiment. It is the schematic which shows the mounting modification example of the reinforcing jig which concerns on 1st Embodiment. It is an enlarged perspective view which shows the 1st modification of the reinforcing jig which concerns on 1st Embodiment. It is an enlarged perspective view which shows the 2nd modification of the reinforcing jig which concerns on 1st Embodiment. It is an enlarged plan view which shows the mounting state of the reinforcing jig which concerns on 2nd Embodiment. It is an enlarged plan view which shows the mounting state of the reinforcing jig which concerns on 3rd Embodiment. It is a rear view of the reinforcing jig which concerns on 3rd Embodiment. It is an enlarged perspective view which shows the mounting state of the reinforcing jig which concerns on another Embodiment 1. FIG. It is a vertical cross-sectional view which shows the mounting state of the reinforcing jig which concerns on another Embodiment 1. FIG. It is a vertical cross-sectional view which shows the mounting state of the reinforcing jig which concerns on another Embodiment 2.

Hereinafter, embodiments of the joint reinforcing jig according to the present invention will be described with reference to the drawings. In the present embodiment, as an example of the reinforcing jig P, both flange portions 1A and 1B (an example of the first tubular member and the second tubular member) projecting outward in the radial direction A case of reinforcing the joint portion of the first flange portion and the second flange portion) will be described. However, the present invention is not limited to the following embodiments, and various modifications can be made without departing from the gist thereof.

1 to 3 show flange joints in the middle of the fluid piping system (pipeline). Large-diameter flanges 1A and 1B formed so as to protrude outward from the ends of both cast iron water pipes 1 and 1, which are examples of fluid pipes, form a plurality of connecting bolts 4A and a plurality of connecting bolts 4A. They are connected by nuts 4B (14 locations each in this embodiment). In the present embodiment, the side where the nut 4B is located is the first flange portion 1A, and the side where the head portion 4a of the connecting bolt 4A is located is the second flange portion 1B. Washers 4C and 4C are interposed between the nut 4B and the first flange portion 1A and between the head portion 4a of the connecting bolt 4A and the second flange portion 1B, respectively. In this way, the connecting bolt 4A, the nut 4B, and the washers 4C and 4C form a connecting mechanism for connecting the flange portions 1A and 1B. The washers 4C and 4C may be omitted.

A ring-shaped sheet-shaped gasket 2 is interposed between the two flange portions 1A and 1B. In both flange portions 1A and 1B, a plurality of through holes 3 (14 locations each in the present embodiment) penetrating in the flange joining direction (axial direction, hereinafter referred to as "joining direction") are equidistant in the circumferential direction. The connecting bolt 4A is inserted into these through holes 3, and the nut 4B is screwed and fixed to the tip end side of the male threaded portion 4b of the connecting bolt 4A. The flange portions 1A and 1B of the present embodiment are so-called RF type flanges provided with a flat seating surface inside the through hole 3.

In the following, in both flange portions 1A and 1B, the surfaces on the side where the water pipe 1 protrudes are referred to as outer surfaces 1a and 1a in the joining direction, respectively. Further, the surfaces of both flanges 1A and 1B on the outer side in the radial direction will be described as outer peripheral surfaces 1c and 1c.

As shown in FIGS. 4 to 8, the reinforcing jig P includes a first holding member 6 having a first pressing portion 6e that presses the outer surface 1a of the first flange portion 1A, and an outer surface of the second flange portion 1B. A second holding member 5 having a second pressing portion 5e for pressing 1a is provided. For example, fine irregularities may be formed on the pressing portions 6e and 5e, or a rubber member may be attached to the surfaces of the pressing portions 6e and 5e on the outer surfaces 1a and 1a of the flange portions 1A and 1B. On the other hand, friction processing is applied so that frictional resistance is generated. It is not necessary to perform friction processing on both pressing portions 6e and 5e, and the mode of friction processing is not particularly limited.

Further, with both pressing portions 6e and 5e abutting against the outer surfaces 1a and 1a of both flange portions 1A and 1B, both holding members 6 and 5 (both pressing portions 6e and 5e) are pulled in the joining direction (both pressing portions 6e and 5e). It is provided with a fastening mechanism 7 for fixing (closely) (see FIGS. 6 to 7).

As shown in FIG. 4, the first sandwiching member 6 is made of a metal material, and has an inserted portion 6A having an outer surface 6a and an inner surface 6b formed in an elliptical bottomed cylindrical shape in a cross-sectional view, and an inserted portion. At one end of 6A, it extends outward from one side of the outer surface 6a of the inserted portion 6A, and extends from the side surface of the first base portion 6B (an example of the base portion) having the first pressing portion 6e and the first base portion 6B. It is configured to be integrally provided with a drop-out prevention arm 6C to be formed. The dropout prevention arm 6C may be formed so as to extend from the tip surface of the first base portion 6B, or the dropout prevention arm 6C may be separately manufactured and joined to the first base portion 6B, and is not particularly limited.

Inside the inserted portion 6A, a tubular internal space 6c is formed along the joining direction to receive the insertion portion 5A of the second sandwiching member 5, which will be described later. That is, when the reinforcing jig P is attached to both the flange portions 1A and 1B, the insertion portion 5A is formed in the second holding member 5 at a position radially outside the outer peripheral surface 1c of the first flange portion 1A. The first sandwiching member 6 is formed with an inserted portion 6A that internally receives the inserting portion 5A along the joining direction (see FIGS. 6 to 7).

The tubular internal space 6c is formed in an elliptical shape in a cross-sectional view, and is formed slightly larger than the elliptical insertion portion 5A in a cross-sectional view. Therefore, the shape perpendicular to the joining direction between the outer surface 5a of the insertion portion 5A and the inner surface 6b of the inserted portion 6A is such that when the insertion portion 5A is inserted into the tubular internal space 6c of the insertion portion 6A, the insertion direction (cylindrical shape). It is slidable in the longitudinal direction of the internal space 6c), but is formed so as to be unable to rotate relative to the insertion direction (around the axis along the longitudinal direction of the tubular internal space 6c).

Further, in the tubular internal space 6c, an opening is formed on the side opposite to the side where the first base portion 6B is formed, and the bottom portion 6Aa of the inserted portion 6A is formed on the side where the first base portion 6B is formed. There is. The bottom portion 6Aa of the inserted portion 6A is formed by penetrating two insertion holes 6d1 and 6d2 into which the male screw portions 7a1 and 7b1 of two adjacent fastening bolts 70A and 70B can be inserted and the heads 7a2 and 7b2 cannot be inserted. (See FIG. 4, cross-sectional view, FIG. 6). At the bottom 6Aa of the inserted portion 6A, the height of the second head 7b2 of the second fastening bolt 70B (second bolt) is the height of the first head 7a2 of the first fastening bolt 70A (first bolt). A tapered step portion 6Ab is formed so as to be lower than the height (see the cross-sectional view of FIG. 4). In the state where the male screw portions 7a1, 7b1 of the fastening bolts 70A and 70B are inserted into the insertion holes 6d1, 6d2, there is a gap between the outer peripheral surface of the male screw portions 7a1, 7b1 and the inner peripheral surface of the insertion holes 6d1, 6d2. A predetermined gap is formed (see FIG. 6).

The first base portion 6B is formed in a slightly constricted shape in a plan view (see the plan view of FIG. 4), and the side opposite to the side on which the first pressing portion 6e is formed inclines toward the tip side in a vertical cross-sectional view. It is formed in a tapered shape (see the cross-sectional view of FIG. 4). Further, the tip portion of the surface of the first base portion 6B opposite to the insertion hole 6d is formed as the first pressing portion 6e perpendicular to the outer surface 6a of the inserted portion 6A (see the cross-sectional view of FIG. 4). That is, the first base portion 6B has a function of supporting the first pressing portion 6e.

The fall-out prevention arm 6C is an L-shaped or C-shaped member extending from the side surface of the first base portion 6B (see the plan view of FIG. 4 and the perspective view of FIG. 4), and is a nut screwed into the connecting bolt 4A. It is formed to have a diameter larger than the outer circumference of the nut 4B so that at least a part of the 4B can be surrounded (see FIG. 8). When the reinforcing jig P is attached to both flange portions 1A and 1B, the fall-out prevention arm 6C comes into contact with the nut 4B from the inside toward the outer diameter. Further, in a vertical cross-sectional view, of the surfaces constituting the fall-out prevention arm 6C, the surface of the tubular internal space 6c on the side opposite to the insertion holes 6d1 and 6d2 in the longitudinal direction is with respect to the first flange portion 1A at the time of mounting. It is retired from the insertion hole 6d side of the first pressing portion 6e so as to have a gap (see the cross-sectional view of FIG. 4). The first holding member 6 and the second holding member 5 may be mounted in opposite directions so that the fall prevention arm 6C is brought into contact with the head portion 4a of the connecting bolt 4A, and the present invention is not particularly limited.

As shown in FIGS. 7 to 8, the fall-out prevention arm 6C has at least a thickness of the edge portion 6Ca that abuts on the nut 4B so as to retreat in the joining direction (toward the first flange portion 1A) with respect to the nut 4B. It is set smaller than other parts. In particular, in the edge portion 6Ca of the fall prevention arm 6C in the present embodiment, the step portion 6Cc that has stepped down toward the first flange portion 1A is transferred from the connection portion between the first base portion 6B and the fall prevention arm 6C to the tip portion 6Cb. It is formed over. That is, the edge portion 6Ca is formed with a notch having an L-shaped cross section inward in the radial direction so as to retreat toward the first flange portion 1A from the top surface 6Cd of the fall prevention arm 6C. The notch of the edge portion 6Ca is set to a size that allows a tightening tool R such as a ratchet wrench for tightening the nut 4B to be inserted (see FIG. 9). If such a step portion 6Cc (notch) is formed, a concave gap is formed between the side surface of the nut 4B and the side wall of the step portion 6Cc, so that the tightening tool R can be easily inserted and the tightening tool The tip of R can be easily hooked on the nut 4B.

Further, the edge portion 6Ca is formed in an arc shape and is in point contact with the apex of the hexagonal nut 4B. The edge portion 6Ca may be brought into surface contact with the washer 4C, or the nut 4B may be formed in an arc shape to bring the edge portion 6Ca into surface contact, and is not particularly limited. Further, the nut 4B may be formed in a polygonal shape other than a hexagon, or the edge portion 6Ca may be formed in a shape along the outer shape of the nut 4B.

As a result, even if the flanges 1A and 1B are distorted, deformed, or relatively displaced due to their own weight or an earthquake, the fall-out prevention arm 6C surely comes into contact with the nut 4B, so that the reinforcing jig P can be used. It is possible to more reliably prevent the flange portions 1A and 1B from falling off.

As shown in FIG. 5, the second sandwiching member 5 is made of a metal material, and the outer surface 5a is elliptical in cross-sectional view, and the two inner peripheral surfaces 5b1 and 5b2 are circular bottomed square cylinders. The formed insertion portion 5A, the flange-shaped portion 5B extending outward from the outer surface 5a of the insertion portion 5A at one end of the insertion portion 5A, and the flange-shaped portion 5B further extending from one side of the flange-shaped portion 5B. It is configured to be integrally provided with a second base portion 5C extending outward.

Inside the insertion portion 5A, two cylindrical internal spaces 5c1 and 5c2 through which the male screw portions 7a1 and 7b1 of the two fastening bolts 70A and 70B can be inserted are formed (see FIG. 6). The inner diameters of the tubular internal spaces 5c1 and 5c2 are formed to be slightly larger than the outer diameters of the male screw portions 7a1 and 7b1 of the fastening bolts 70A and 70B.

The brim-shaped portion 5B is formed in an elliptical shape in a plan view, and two tubular internal spaces 5c1 and 5c2 are formed through the central portion (see the plan view of FIG. 5 and the cross-sectional view of FIG. 5).

In the tubular internal space 5c1 and 5c2, an opening is formed on the side where the brim-shaped portion 5B and the second base portion 5C are formed, and a fastening bolt is formed on the side opposite to the side where the brim-shaped portion 5B and the second base portion 5C are formed. Two female threaded portions 5d1, 5d2 to which the male threaded portions 7a1 and 7b1 of 70A and 70B can be screwed are formed as openings so as to penetrate the bottom portion of the insertion portion 5A. That is, the female screw portions 5d1, 5d2 are formed at the end portions on the side to be inserted 6A on the inner peripheral surfaces 5b1, 5b2 of the tubular internal space 5c1, 5c2 in the insertion portion 5A (see FIG. 6). The space between these two female threaded portions 5d1 and 5d2 is filled with a metal material. Therefore, even when a large tightening torque of the fastening bolts 70A and 70B acts on the female screw portions 5d1 and 5d2, it is possible to prevent the insertion portion 5A from being damaged.

The second base portion 5C is formed in a slightly constricted shape in a plan view (see the plan view in FIG. 5), and is formed in a tapered shape that inclines toward the female threaded portions 5d1 and 5d2 toward the tip side in a vertical cross-sectional view. (See FIG. 5 cross-sectional view). Further, the tip portion of the surface of the second base portion 5C on the side of the female screw portions 5d1 and 5d2 is formed as a second pressing portion 5e perpendicular to the outer surface 5a of the insertion portion 5A.

As shown in FIGS. 6 to 7, the fastening mechanism 7 has a first fastening mechanism 7A and a second fastening mechanism 7B provided adjacent to the first fastening mechanism 7A. The first fastening mechanism 7A is inserted into the tubular internal space 5c1 of the insertion portion 5A from the outside of the insertion portion 6A via the insertion hole 6d1 and into the first fastening bolt 70A and the inner peripheral surface 5b1 of the insertion portion 5A. It is composed of a first female screw portion 5d1 formed and a first washer 8A interposed between the first fastening bolt 70A and the flange-shaped portion 5B. Similarly, the second fastening mechanism 7B has a second fastening bolt 70B inserted into the tubular internal space 5c2 of the insertion portion 5A from the outside of the inserted portion 6A via the insertion hole 6d2, and an inner circumference of the insertion portion 5A. It is composed of a second female screw portion 5d2 formed on the surface 5b2 and a second washer 8B interposed between the second fastening bolt 70B and the flange-shaped portion 5B. The first washer 8A and the second washer 8B may be omitted.

The first fastening bolt 70A has a first head portion 7a2 located outside the bottom portion 6Aa of the inserted portion 6A, and a first male screw portion 7a1 screwed into the first female screw portion 5d1 of the insertion portion 5A. There is. Similarly, the second fastening bolt 70B has a second head portion 7b2 located outside the bottom portion 6Aa of the inserted portion 6A and a second male threaded portion 7b1 screwed into the second female threaded portion 5d2 of the insertion portion 5A. Have.

In the present embodiment, the outer diameter dimension and the outer diameter shape of the nut 4B, the first head portion 7a2 of the first fastening bolt 70A, and the second head portion 7b2 of the second fastening bolt 70B are configured to be the same. As a result, the ratchet wrench tightening tool R for increasing the tightening torque can also be used (see FIG. 9). Further, the center of the first head portion 7a2 of the first fastening bolt 70A and the center of the second head portion 7b2 of the second fastening bolt 70B are the outer peripheral surface 1c of the first flange portion 1A (the outer peripheral surface of the second flange portion 1B). The distance from 1c) is set differently. In other words, the distance between the center of the first head portion 7a2 of the first fastening bolt 70A and the center of the second head portion 7b2 of the second fastening bolt 70B is the distance from the boundary line between the inserted portion 6A and the first base portion 6B. It is set differently. As a result, even if both flange portions 1A and 1B have irregularities, the reinforcing jig P can be mounted while avoiding the irregularities.

Next, a work process of mounting the reinforcing jig P on both flange portions 1A and 1B connected by a plurality of connecting bolts 4A and nuts 4B will be described.

First, as shown in FIGS. 1 to 3, one existing bolt and nut (not shown) of both flange portions 1A and 1B are removed and replaced with connecting bolts 4A and nuts 4B. Sequentially perform this replacement for all existing bolts and nuts.

Next, as shown in FIG. 7, the insertion portion 5A of the second sandwiching member 5 is inserted into the first sandwiching member 6 at a position on the outer side in the radial direction with respect to the outer peripheral surfaces 1c and 1c of the flange portions 1A and 1B. It is inserted into the tubular internal space 6c of the insertion portion 6A from the joining direction. At that time, since the outer surface 5a of the insertion portion 5A and the inner surface 6b of the inserted portion 6A are formed in an elliptical shape that cannot be relatively rotated in the cross-sectional view, the first pressing portion 6e and the second pressing portion 6e of the first holding member 6 are formed. It can be easily inserted in a state where the second pressing portion 5e of the holding member 5 is positioned in the desired relative positional relationship extending in the same direction.

Next, the two fastening bolts 70A and 70B are inserted into the tubular internal space 6c from the outside of the inserted portion 6A in the joining direction via the insertion holes 6d1 and 6d2, and temporarily fixed. The engagement between the insertion portion 5A and the insertion portion 6A and the temporary fixing of the fastening bolts 70A and 70B are performed once, in the joining direction, the first pressing portion 6e of the first sandwiching member 6 and the second of the second sandwiching member 5. The distance from the pressing portion 5e is slightly larger than the distance between the outer surface 1a of the first flange portion 1A and the outer surface 1a of the second flange portion 1B. That is, the size (insertion distance) of the overlapping portion between the inserted portion 6A and the inserting portion 5A in the joining direction and the distance between the first pressing portion 6e and the second pressing portion 5e can be appropriately set. .. Therefore, even if the wall thickness is changed according to the nominal diameters and design pressures of both flange portions 1A and 1B, the first sandwiching member 6 and the second sandwiching member 5 can be moved by adjusting the size of the overlapping portion. It can be satisfactorily tightened and fixed to both flange portions 1A and 1B.

Subsequently, the reinforcing jig P is attached to both flange portions 1A and 1B. At this time, the outer surface 6a of the inserted portion 6A on the side where the first pressing portion 6e extends is brought into contact with at least one of the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B from the outside diameter direction. Further, the fall prevention arm 6C of the first holding member 6 is brought into contact with or close to the nut 4B from the inside in the outer diameter direction (see FIG. 8).

The extension direction of the fall prevention arm 6C is set in the same direction as the direction in which the first holding member 6 provided with the fall prevention arm 6C rotates together when the fastening bolts 70A and 70B are rotated to the tightening side. Has been done. That is, the fall-out prevention arm 6C is the tightening direction of the fastening bolts 70A and 70B from the side surface of the first base portion 6B of the first holding member 6 (in this embodiment, since the fastening bolt 70A is a right-handed screw, the insertion hole 6d It is formed so as to extend in the clockwise direction (centered around). Therefore, when the fastening bolts 70A and 70B are tightened, the fall-out prevention arm 6C comes into contact with the nut 4B and becomes a rotational resistance, so that the tightening work is easy.

If there is no space for inserting the fall prevention arm 6C inside the nut 4B in the radial direction, the reinforcing jig P may be turned upside down and mounted upside down. In this case, the fall-out prevention arm 6C abuts or approaches the head portion 4a of the connecting bolt 4A located on the second flange portion 1B from the inside to the outside diameter.

Next, the first pressing portion 6e of the first holding member 6 presses the outer surface 1a of the first flange portion 1A, and the second pressing portion 5e of the second holding member 5 presses the outer surface 1a of the second flange portion 1B. The first fastening bolt 70A and the second fastening bolt 70B are tightened in order until the insertion portion 5A and the inserted portion 6A are pulled in the joining direction. As a result, the reinforcing jig P rotates clockwise together, and the fall prevention arm 6C and the nut 4B are surely in contact with each other.

After mounting the reinforcing jig P, similarly, another reinforcing jig P is sequentially mounted on the other nuts 4B in both flange portions 1A and 1B from the outer diameter direction. If necessary, the reinforcing jig P may be attached to all the nuts 4B, or may be attached only to a part of the adjacent portions of the nuts 4B.

Next, the male threaded portions 7a1 and 7b1 of the fastening bolts 70A and 70B are screwed into the female threaded portions 5d1 and 5d2 of the inserting portion 5A to retighten the fastening mechanism 7 of all the reinforcing jigs P. At this time, since the fastening bolts 70A and 70B are located radially outside the flange portions 1A and 1B and outside the bottom portion 6Aa of the inserted portion 6A, the tightening operation is easy. Moreover, since the fall prevention arm 6C is in contact with the nut 4B, the tightening posture is stable.

When the fastening bolts 70A and 70B are tightened and fixed, the pressing portions 6e and 5e of the holding members 6 and 5 move in close proximity to the outer surfaces 1a and 1a of the flange portions 1A and 1B. At the same time, the first flange portion 1A and the second flange portion 1B move in the proximity direction to each other due to the tightening force of the fastening bolts 70A and 70B. As a result, the nut 4B can be further tightened. At this time, in the present embodiment, since the first fastening mechanism 7A and the second fastening mechanism 7B provided adjacent to the first fastening mechanism 7A are provided, the tightening torque for the flange joint portion of the fastening mechanism 7 is provided. Can be further increased.

Further, when the reinforcing jig P is fixed to both flange portions 1A and 1B, the center of the first pressing portion 6e and the second pressing portion 5e is a virtual ring surface in which the outer shape of the nut 4B is extended in the circumferential direction. It will be located in the area of. Therefore, when the first pressing portion 6e and the second pressing portion 5e move close to each other, a certain gap is likely to be formed between the nut 4B and the first flange portion 1A, and the nut 4B is moved to the first flange portion 1A. However, there is no inconvenience of being in a one-sided contact state. Therefore, when the nut 4B is tightened, both flange portions 1A and 1B move uniformly in close proximity.

Next, all the nuts 4B that join the flange portions 1A and 1B are retightened using a tightening tool R such as a ratchet wrench (see FIG. 9). At this time, the connecting bolt 4A is fixed by using another tool such as a spanner. In the present embodiment, a step portion 6Ab is provided on the bottom portion 6Aa of the inserted portion 6A so that the second head portion 7b2 of the second fastening bolt 70B is lower than the first head portion 7a2 of the first fastening bolt 70A. See the cross section of FIG. 4). Therefore, among the plurality of reinforcing jigs P installed on both flange portions 1A and 1B, the first fastening bolt 70A of one reinforcing jig P and the other reinforcing jigs adjacent to one reinforcing jig P are used. A second fastening bolt 70B having a second head 7b2 lower than the first head 7a2 of the first fastening bolt 70A is located between the first fastening bolt 70A of P (see FIG. 9). As a result, when the nuts 4B of both flange portions 1A and 1B are tightened by the tightening tool R, the rotation range of the tightening tool R can be increased without the tightening tool R being caught by the second head 7b2. can. Therefore, the tightening work of the nut 4B for obtaining a desired tightening torque is easy.

In the present embodiment, the step portion 6Cc stepped down toward the first flange portion 1A so that the edge portion 6Ca of the fall prevention arm 6C retreats from the nut 4B in the joining direction is the tip portion from the first base portion 6B. It is formed over 6 Cb (see FIG. 8). That is, around the nut 4B, the height of the fall prevention arm 6C is set to be smaller than the height of the nut 4B. Therefore, when tightening the nut 4B, the tightening tool R can be reliably inserted around the nut 4B, so that it is not necessary to configure the nut 4B with an expensive high nut.

Next, the fastening bolts 70A and 70B and the nuts 4B are alternately retightened until the tightening torques of the connecting bolts 4A and 4B and the fastening bolts 70A and 70B reach a predetermined reference value. As a result, the joint strength of both flange portions 1A and 1B by the reinforcing jig P can be further improved, and the separation and displacement of both flange portions 1A and 1B and the leakage of clean water due to these can be prevented more reliably. , It is also possible to improve the seismic performance of the pipeline. In particular, the fastening mechanism 7 in the present embodiment has a first fastening mechanism 7A and a second fastening mechanism 7B provided adjacent to the first fastening mechanism 7A. Therefore, the tightening torque for both flange portions 1A and 1B of the fastening mechanism 7 can be further increased. As a result, even with the large-diameter flange portions 1A and 1B, the detachment prevention force can be enhanced.

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

In the present embodiment, since the female screw portions 5d1 and 5d2 are located at the overlapping portions of the insertion portion 5A and the inserted portion 6A, the lengths of the fastening bolts 70A and 70B can be made relatively short. Therefore, it is possible to satisfactorily prevent the tips of the fastening bolts 70A and 70B from protruding to the outside of the tubular internal spaces 5c1 and 5c2. Moreover, in a state where the male screw portions 7a1, 7b1 of the fastening bolts 70A and 70B are inserted into the insertion holes 6d1, 6d2, a predetermined value is provided between the outer peripheral surface of the male screw portions 7a1, 7b1 and the inner peripheral surface of the insertion holes 6d1, 6d2. A gap is formed. Therefore, even if a force acts on both flange portions 1A and 1B in the shearing direction (diameter direction) and the fastening bolts 70A and 70B are slightly displaced in the radial direction, the male screw portions 7a1 of the fastening bolts 70A and 70B , 7b1 does not come into contact with the insertion holes 6d1 and 6d2, and the fastening bolts 70A and 70B can be prevented from stretching or breaking.

Further, in the present embodiment, the surface of the fall prevention arm 6C facing the outer surface 1a of the first flange portion 1A is arranged on the side of the first pressing portion 6e so as to be separated from the outer surface 1a of the first flange portion 1A. Therefore, even when the fastening bolt 70A is tightened, the fall prevention arm 6C does not come into contact with the outer surface 1a of the first flange portion 1A. As a result, no load is directly applied to the fall prevention arm 6C, and damage to the fall prevention arm 6C can be prevented.

Further, even if the flange portions 1A and 1B are distorted, deformed, or relatively displaced due to their own weight or an earthquake, the falling-out prevention arm 6C surely contacts the nut 4B, so that the reinforcing jigs P are both. It is possible to more reliably prevent the flange portions 1A and 1B from falling off. Similarly, even if the reinforcing jig P is provided at any position in the circumferential direction of the flange portions 1A and 1B, the reinforcing jig P is prevented from falling off from the flange portions 1A and 1B downward. be able to.

Hereinafter, only the configuration different from the above-described embodiment will be described with respect to another embodiment. In addition, in order to facilitate understanding of the drawings, the same members will be described using the same names and reference numerals.

[Example of mounting modification of reinforcing jig]
FIG. 10 shows an example in which the reinforcing jig P is attached to both flange portions 1A and 1B when a pipe (not shown) is used as the first tubular member and a valve device 1X is used as the second tubular member. .. In the valve device 1X of the present embodiment, a pedestal 1Xa is provided in an accommodating space such as a sluice valve, and the outer peripheral surfaces 1c and 1c on the bottom side of both flange portions 1A and 1B are formed to project radially outward in a rectangular shape. Has been done. Further, the pipe connected to both flange portions 1A and 1B may be provided with a plurality of ribs 1Xb. In the reinforcing jig P according to the first embodiment, the center of the first head portion 7a2 of the first fastening bolt 70A and the center of the second head portion 7b2 of the second fastening bolt 70B are the inserted portion 6A and the first base portion. Since the distance from the boundary line with 6B is set differently, it can be mounted in a form that avoids unevenness such as the pedestal 1Xa and the rib 1Xb.

Specifically, the inserted portion 6A is arranged diagonally at one corner of the pedestal 1Xa at a distance from the outer peripheral surfaces 1c and 1c of both flanges 1A and 1B, and is reinforced and cured at the other corner of the pedestal 1Xa. The inserted portion 6A is arranged diagonally with the tool P inverted and slightly separated from the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B. Further, in a state where the first base portion 6B of the first holding member 6 is in contact with the rib 1Xb, the inserted portion 6A is arranged diagonally with a slight distance from the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B. There is. As described above, the reinforcing jig P in the present embodiment is highly versatile and can be installed in any posture.

[First Modified Example of First Embodiment]
On the edge portion 6Ca of the fall-out prevention arm 6C in the above-described embodiment, a step portion 6Cc stepped down toward the first flange portion 1A is formed from the first base portion 6B of the first holding member 6 to the tip portion 6Cb. did. Instead, as shown in FIG. 11, a stepped portion 61Cc stepped down toward the first flange portion 1A may be formed only around the nut 4B on the edge portion 61Ca of the fall prevention arm 61C. .. In this case, since the thickness of the fall-out prevention arm 6C is secured from the first base portion 6B of the first holding member 6 to the portion where the step portion 61Cc is formed, the rigidity of the fall-out prevention arm 6C can be increased.

[Second modification of the first embodiment]
As shown in FIG. 12, a tapered surface 62Cc may be formed from the top surface 62Cd of the dropout prevention arm 62C to the edge portion 62Ca. Even in this case, the nut 4B can be easily tightened. The first modification and the third modification may be combined.

[Second Embodiment]
FIG. 13 shows the reinforcing jig P according to the second embodiment. In the present embodiment, the center of the first head portion 7a2 of the first fastening bolt 70A and the center of the second head portion 7b2 of the second fastening bolt 70B are the outer peripheral surface 1c of the first flange portion 1A (second flange portion 1B). The distance from the outer peripheral surface 1c) is set to be equal. In other words, the distance between the center of the first head portion 7a2 of the first fastening bolt 70A and the center of the second head portion 7b2 of the second fastening bolt 70B is the distance from the boundary line between the inserted portion 6A and the first base portion 6B. They are set equally.

As a result, the tightening torques of the two fastening bolts 70A and 70B can be evenly applied to the pressing portions 6e and 5e of both holding members 6 and 5.

[Third Embodiment]
14 to 15 show the reinforcing jig P according to the third embodiment. In the present embodiment, the first sandwiching member 6 and the second sandwiching member 5 of the first to second embodiments described above are combined with a pair of first sandwiching members 6X1, 6X2 and a pair of second sandwiching members 5X1, 5X2. It is configured.

The inserted portions 6AX1 and 6AX2 of the pair of first sandwiching members 6X1, 6X2 are connected by a plate-shaped first connecting portion 6f along the outer peripheral surface 1c of the first flange portion 1A, and the pair of second sandwiching members 5X1. , 5X2 insertion portions 5AX1, 5AX2 are connected by a plate-shaped second connecting portion 5f along the outer peripheral surface 1c of the second flange portion 1B. Further, the pair of first holding members 6X1 and 6X2 are provided with the above-mentioned first fastening mechanism 7A and second fastening mechanism 7B, respectively, and the first fastening bolt 70A and the second fastening bolt 70B are inserted into the pair. They are arranged next to each other in a state where they are separately inserted into the portions 6AX1 and 6AX2. By fastening the first fastening mechanism 7A and the second fastening mechanism 7B, the respective pressing portions of the first sandwiching member 6X1, 6X2 and the second sandwiching member 5X1, 5X2 press both sides of the nut 4B. ..

Further, in the present embodiment, a third fastening mechanism 7C for fastening the first connecting portion 6f and the second connecting portion 5f is provided. In the third fastening mechanism 7C, the head portion 7c2 is formed on the third fastening bolt 70C whose head portion 7c2 is located outside the first connecting portion 6f, and the second connecting portion 5f, and the male screw portion 7c1 of the fastening bolt 70C is screwed. It is composed of a third female screw portion 5d3 and a third washer 8C interposed between the third fastening bolt 70C and the first connecting portion 6f. As described above, in the present embodiment, since the third fastening mechanism 7C is provided in addition to the first fastening mechanism 7A and the second fastening mechanism 7B, the tightening torque for both flange portions 1A and 1B is further increased. Can be done.

[Another Embodiment 1]
The configurations of the first sandwiching member 6, the second sandwiching member 5, and the fastening mechanism 7 in the above-described embodiment can be appropriately changed. For example, as shown in FIGS. 16 to 17, the second holding member 50 is composed of a U-shaped member having a pair of leg portions 50A and 50B, and the first holding member 60 is formed on the leg portion 50B. It is composed of a pair of bolts provided with a male screw shaft portion 70a screwed into the through female screw hole 50a. The pair of bolts serving as the first holding member 60 also functions as fastening mechanisms 7A and 7B for fixing the head 70b of the bolt and the second holding member 50 so as to be close to each other in the joining direction of both flange portions 1A and 1B. .. The first holding member 60 has a pair of first pressing portions 60e for pressing the first flange portion 1A, and the second holding member 50 has an outer surface 1a of the second flange portion 1B at the tip of the leg portion 50A. Has a second pressing portion 50e for pressing.

Also in the present embodiment, the dropout prevention arm 6C is formed of an L-shaped or C-shaped member extending from the side surface of the base portion 60B of the first pressing portion 60e (base portion 60B supporting the first pressing portion 60e). Has been done. In this fall prevention arm 6C, a step portion 6Cc that has stepped down toward the first flange portion 1A is formed from a connection portion between the first base portion 6B and the fall prevention arm 6C to a tip portion 6Cb.

[Separate Embodiment 2]
As shown in FIG. 18, the insertion portion 51A of the second sandwiching member 51 is formed in the shape of a square bar having an outer diameter that can be inserted into the inserted portion 61A of the first sandwiching member 61, and the first sandwiching member 61 is inserted. The portion 61A is formed in a tubular shape. A pair of bolts 52 having a male screw portion 52a are formed so as to project in the joining direction on the tip end side of the insertion portion 51A, and the insertion portion 51A is engaged in the inserted portion 61A so as not to rotate relative to each other. The fastening nut 53 may be screwed from the outside to the outer surface side of the inserted portion 61A.

[Other Embodiments]
(A) The number of connecting bolts 4A and nuts 4B can be appropriately adjusted according to the nominal diameters of the flange portions 1A and 1B, the design pressure, and the like. Further, in the above-described embodiment, the side where the nut 4B is located is the first flange portion 1A, and the side where the head portion 4a of the connecting bolt 4A is located is the second flange portion 1B. The side where the two flange portions 1B and the head portion 4a of the connecting bolt 4A are located may be the first flange portion 1A.

(B) The mounting procedure of the reinforcing jig P can be changed as appropriate. For example, first, the first pressing portion 6e of the first holding member 6 is brought into contact with the outer surface 1a of the first flange portion 1A, and the fall prevention arm 6C is attached to the nut 4B from the radial inner side of the first flange portion 1A. Abut or approach. Next, the second pressing portion 5e is brought into contact with the outer surface 1a of the second flange portion 1B while inserting the inserting portion 5A of the second holding member 5 into the inside of the inserted portion 6A from the joining direction. Next, the male screw portions 7a1, 7b1 of the fastening bolts 70A and 70B are screwed into the female screw portions 5d1, 5d2 of the insertion portion 5A via the insertion holes 6d1, 6d2 of the insertion portion 6A, and both holding members 6 and 5 are screwed into both flanges. It can also be attached to parts 1A and 1B.

(C) In the above embodiment, the dropout prevention arm 6C is provided only on the first holding member 6, but may be provided on the second holding member 5 or both holding members 6 and 5, if necessary. Further, the fall-out prevention arm 6C is not formed in a concave shape that wraps around the head portion 4a or the nut 4B of the connecting bolt 4A from the radial inner side to the radial outer side of both flange portions 1A and 1B, but simply. , Both flange portions 1A and 1B may be composed of rod-shaped members that abut from the inner side in the radial direction.

(D) In the above embodiment, the first sandwiching member 6 is provided with the inserted portion 6A, and the second sandwiching member 5 is provided with the inserting portion 5A. However, the second sandwiching member 5 is provided with the inserted portion. The first sandwiching member 6 may be provided with an insertion portion.

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

(F) In the above embodiment, the configuration in which both flange portions 1A and 1B are so-called RF type flanges has been described, but other flange joints may be used as long as they are flange joints, for example, groove portions for gaskets. It may be a so-called GF type flange provided with.

(G) In the above embodiment, the reinforcing jig P is attached to both flange portions 1A and 1B formed on both cast iron water pipes 1 and 1, which are examples of the fluid pipes constituting the fluid piping system (pipeline). Although an example has been described, the fluid pipe may be a pipe through which a gas or liquid flows.

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

1 Water pipe (first tubular member, second tubular member)
1A 1st flange 1B 2nd flange 1a Outer side surface 1c Outer surface 4A Connecting bolt 4a Head 4B Nut 5 2nd holding member 5e 2nd pressing part 5A Inserting part 6 1st holding member 6e 1st pressing part 6A Inserted Part 6Aa Bottom 6Aa Step 6B First base (base)
6C Fall-off prevention arm 6Ca Edge 7 Fastening mechanism 7A First fastening mechanism 7a1 First female thread 7a2 First head 70A First fastening bolt (first bolt)
7B Second fastening mechanism 7b1 Second female thread 7b2 Second head 70B Second fastening bolt (second bolt)
P Reinforcing jig

Claims (6)

Attached to the joint where the first flange portion protruding outward from the end of the first tubular member and the second flange protruding outward from the end of the second tubular member are joined with connecting bolts. It is a reinforcing jig for the joint to be made.
A first pressing portion that presses the outer surface in the joint direction of the first flange portion which the head or nut of the connecting bolt is arranged, and a second pressing portion that presses the outer surface of the second flange portion, the A pair of holding members that are held separately,
A fastening mechanism for fixing the first pressing portion and the second pressing portion in close proximity to each other in the joining direction is provided.
The fastening mechanism has a first fastening mechanism and a second fastening mechanism provided adjacent to the first fastening mechanism .
One of the sandwiching members is formed with an insertion portion that is inserted from the joining direction at a position radially outside the outer peripheral surface of the first flange portion, and the other sandwiching member has the insertion portion. The inserted part is formed to receive the inside.
The first fastening mechanism has a first bolt or a first nut located outside the insertion portion or the bottom portion of the insertion portion.
The second fastening mechanism has a second bolt or a second nut located on the outside of the bottom portion.
A step portion is formed on the bottom portion so that the height of the second head of the second bolt or the second nut is lower than the height of the first head of the first bolt or the first nut. reinforcing jig junction being. Attached to the joint where the first flange portion protruding outward from the end of the first tubular member and the second flange protruding outward from the end of the second tubular member are joined with connecting bolts. It is a reinforcing jig for the joint to be made.
A first pressing portion that presses the outer surface of the first flange portion in the joining direction in which the head or nut of the connecting bolt is arranged, and a second pressing portion that presses the outer surface of the second flange portion. A pair of holding members that are held separately,
A fastening mechanism for fixing the first pressing portion and the second pressing portion in close proximity to each other in the joining direction is provided.
The fastening mechanism has a first fastening mechanism and a second fastening mechanism provided adjacent to the first fastening mechanism.
One of the sandwiching members is formed with a bottomed tubular insertion portion that is inserted from the joining direction at a position radially outside the outer peripheral surface of the first flange portion, and the other sandwiching member has a bottomed tubular insertion portion. Is formed with a bottomed tubular inserted portion that receives the insertion portion inside.
The first fastening mechanism is formed at a first bolt including a first head located outside the bottom portion of the inserted portion and an end portion of the insertion portion on the side to be inserted, and the first bolt is formed. It has a first female screw part to be screwed, and
The second fastening mechanism is formed on a second bolt including a second head located outside the bottom portion of the inserted portion and the end portion of the insertion portion on the side to be inserted, and the second fastening mechanism is formed. It has a second female threaded part to which the bolt is screwed, and
Wherein the bottom portion of the insertion portion, the reinforcing jig junction height of the second head that has step portion is formed so as to be lower than the height of the first head. The reinforcing jig for a joint according to claim 2 , wherein the head or nut, the first head and the second head have the same outer diameter dimension and outer diameter shape. The reinforcing jig for a joint according to claim 2 or 3, wherein the first head and the second head are set to have the same distance from the outer peripheral surface of the first flange portion. The pair of holding members are made of a metal material and are made of a metal material.
The end portion of the insertion portion on the side to be inserted is according to any one of claims 2 to 4, wherein the space between the first female screw portion and the second female screw portion is filled with the metal material. Reinforcing jig for joints. Attached to the joint where the first flange portion protruding outward from the end of the first tubular member and the second flange protruding outward from the end of the second tubular member are joined with connecting bolts. It is a reinforcing jig for the joint to be made.
A first pressing portion that presses the outer surface of the first flange portion in which the head or nut of the connecting bolt is arranged in the joining direction, and the first pressing portion.
A second pressing portion that presses the outer surface of the second flange portion, and a second pressing portion.
A fastening mechanism for fixing the first pressing portion and the second pressing portion in close proximity to each other in the joining direction.
A fall-prevention arm that extends from the base of the first pressing portion and comes into contact with the head or nut from the inside toward the outside diameter is provided.
The fastening mechanism has a first fastening mechanism and a second fastening mechanism provided adjacent to the first fastening mechanism.
The drop-off preventing arm, to retire the joining direction with respect to the head or nut, a thickness of at least the contact with the head or the nut those edges of the junction that is set smaller than other portions Reinforcing jig.

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