JP2017145885A - Reinforcement jig for junction and reinforcement structure for junction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement jig for junction in which a work for attaining a desired fastening torque while preventing falling thereof is facilitated.SOLUTION: A reinforcement jig P for junction comprises: a first depressing part 6e for depressing an outer surface 1a of a first flange part 1A where a head part of a connecting bolt or a nut 4B is arranged; a second depressing part 5e for depressing the outer surface 1a in a junction direction of a second flange part 1B; a fastening mechanism 7 for approaching the first depressing part 6e and the second depressing part 5e toward their junction directions and fixing them; and a falling prevention arm 6C extending from a base part 6B of the first depressing part 6e and abutting from inside toward a radial outer direction in respect to the head part of the connecting bolt or the nut 4B. The falling prevention arm 6C is set in such a way that a thickness of the edge part abutted against at least the head part of the connecting bolt or the nut 4B is made to be smaller than that of other locations to be retracted in a junction direction in respect to the head part of the connecting bolt or the nut 4B.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a reinforcing jig that reinforces a joint portion between flange portions that protrude in a radially outward direction from the end portions of both cylindrical members, and a reinforcing structure of the joint portion using the reinforcing jig.

  As the reinforcing jig, for example, in Patent Document 1, a pair of clamping members each having a pressing portion that abuts against a pair of flange joints, and a fastening mechanism that pulls both the clamping members in the joining direction of the joints and fixes them. The structure provided with these is disclosed.

  One clamping member is formed with a C-shaped drop-off preventing arm that abuts in the radially outward direction from the inside to the head or nut of the connecting bolt that connects both flange portions. This drop-off prevention arm prevents the reinforcing jig from dropping off from both flange portions.

JP 2014-141995 A

  For example, when a flange joint such as a water pipe bridge exposed on the ground is reinforced with a reinforcing jig, the flange joint may be distorted by its own weight or an earthquake if the arm is provided with a drop-off prevention arm as in Patent Document 1. Even if deformation, relative displacement, or the like occurs, the reinforcing jig can be prevented from falling.

  On the other hand, when reinforcing the joint portion between the flange portions, it is necessary to increase the connecting bolts connecting the both flange portions with a fastening tool to satisfy a desired tightening torque. At this time, the drop-off preventing arm is in the way, and it is difficult to insert the tightening tool, and it takes time to tighten the connecting bolt, so there is room for improvement.

  Therefore, there is a demand for a joint reinforcement jig and a joint reinforcement structure that facilitates work for obtaining a desired tightening torque while preventing dropout.

  The characteristic configuration of the reinforcing jig for the joining portion is that the first flange portion projecting radially outward from the end portion of the first cylindrical member and the second flange portion projecting radially outward from the end portion of the second cylindrical member. A first pressing portion that presses the outer surface in the joining direction of the first flange portion, on which a head or a nut of the connecting bolt is disposed, and the second flange portion A second pressing part that presses the outer side of the first pressing part, a fastening mechanism that fixes the first pressing part and the second pressing part close to the joining direction, and extends from a base part of the first pressing part, A drop prevention arm that abuts against the head or the nut from the inside toward the radially outward direction, and the drop prevention arm is at least so as to be retracted in the joining direction with respect to the head or the nut. The thickness of the edge contacting the head or nut is the other part. In that it is smaller than.

  In this configuration, when fixing the reinforcing jig to the flange joint portion, when the fastening mechanism is tightened, the first flange portion and the second flange portion are moved toward each other by 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. A desired tightening torque is obtained by alternately tightening the fastening mechanism and the connecting bolt.

  Moreover, in this structure, it contact | abuts toward the radial direction from the inner side with respect to the head or nut (henceforth a "nut etc.") of the connecting bolt which joins a 1st flange part and a 2nd flange part. A fall prevention arm is provided. For this reason, even if the flange joint is distorted, deformed, or relatively displaced due to its own weight or an earthquake, the fall-off prevention arm is securely in contact with the nut, etc., so that the reinforcing jig is detached from the flange joint. Can be prevented.

  Further, in this configuration, the thickness of at least the edge of the drop-off prevention arm that contacts the nut or the like is set small so that the drop-off prevention arm retracts in the flange joining direction with respect to the nut or the like. That is, around the nut or the like, the height of the drop-off preventing arm is set smaller than the height of the nut or the like. For this reason, when tightening a nut or the like, the tightening tool can be reliably inserted around the nut or the like. Therefore, it is possible to provide a reinforcing jig for the joint that can easily perform a work for obtaining a desired tightening torque while preventing dropout.

  Another characteristic configuration is that a stepped portion that is stepped toward the first flange portion is formed on the edge portion.

  If a step is formed on the edge of the fall-off prevention arm as in this configuration, a concave gap is formed between the side surface of the nut and the side wall of the step portion, so that a tightening tool such as a ratchet is inserted. It is easy to hook the tip of the tightening tool onto a nut or the like.

  Another characteristic configuration is that the stepped portion is formed with a tapered surface that is inclined toward the first flange portion.

  In this configuration, it is possible to guide the tightening tool on the tapered surface while facilitating the mounting of the tightening tool, so that the work for obtaining a desired tightening torque is extremely easy.

  Another characteristic configuration is that the drop-off prevention arm is set to have a thickness that decreases from the base portion toward the tip portion.

  In this configuration, the thickness of the tip of the drop-off prevention arm can be reduced to facilitate the tightening operation of the nut and the like, while ensuring sufficient thickness at the support portion of the drop-off prevention arm to increase the rigidity. . In addition, since the thickness may be gradually reduced from the base portion toward the tip portion, the processing is easy.

  The characteristic configuration of the reinforcing structure of the joint portion includes a first flange portion projecting radially outward from the end portion of the first tubular member, and a second flange portion projecting radially outward from the end portion of the second tubular member. A reinforcing jig mounted on a joint portion joined with a connecting bolt, a first pressing portion that presses an outer surface in a joining direction of the first flange portion on which a head or a nut of the connecting bolt is disposed; A second pressing portion that presses the outer surface of the second flange portion, a fastening mechanism that fixes the first pressing portion and the second pressing portion close to the joining direction, and a base portion of the first pressing portion A drop prevention arm that extends from the head and abuts against the head or the nut from the inside toward the radially outward direction, and the head or the nut is bulkier than the drop prevention arm. Height adjustment between the part or nut and the outer surface of the first flange part Lies in member is inserted.

  The reinforcing jig of this configuration is provided with a drop-off prevention arm that comes into contact with the nut or the like that joins the first flange portion and the second flange portion from the inside toward the radially outward direction. For this reason, even if the flange joint is distorted, deformed, or relatively displaced due to its own weight or an earthquake, the fall-off prevention arm is securely in contact with the nut, etc., so that the reinforcing jig is detached from the flange joint. Can be prevented.

  Further, in this configuration, a height adjusting member is inserted between the nut and the outer surface of the first flange portion so that the nut and the like are bulkier than the drop-off preventing arm. That is, around the nut or the like, the height of the drop-off preventing arm is set smaller than the height of the nut or the like. For this reason, when tightening a nut or the like, the tightening tool can be reliably inserted around the nut or the like. Therefore, it is possible to provide a joint reinforcement structure that facilitates work for obtaining a desired tightening torque while preventing dropout.

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 the 1st clamping member which concerns on 1st embodiment. It is a figure which shows schematic structure of the 2nd clamping member which concerns on 1st embodiment. It is a perspective view which shows the mounting state of the reinforcement jig | tool which concerns on 1st embodiment. It is a top view which shows the mounting state of the reinforcement jig | tool which concerns on 1st embodiment. It is a side view which shows the mounting state of the reinforcement jig | tool which concerns on 1st embodiment. It is sectional drawing which shows the mounting state of the reinforcement jig | tool which concerns on 1st embodiment. It is a top view of the reinforcing jig concerning a first embodiment. It is a front view of the reinforcing jig concerning a first embodiment. It is a right view of the reinforcement jig | tool which concerns on 1st embodiment. It is a rear view of the reinforcing jig concerning a first embodiment. It is a left view of the reinforcement jig which concerns on 1st embodiment. It is a bottom view of the reinforcing jig concerning a first embodiment. It is an enlarged view which shows the 1st modification of 1st embodiment. It is an enlarged view which shows the 2nd modification of 1st embodiment. It is an enlarged view which shows the 3rd modification of 1st embodiment. It is an enlarged view which shows the 4th modification of 1st embodiment. It is an enlarged plan view which shows the mounting state of the reinforcement jig | tool which concerns on 2nd embodiment. It is an enlarged side view which shows the mounting state of the reinforcement jig | tool which concerns on 2nd embodiment. It is a perspective 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 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.

  Below, embodiment of the reinforcement jig | tool P of the junction part which concerns on this invention is described based on drawing. In the present embodiment, as an example of the reinforcing jig P, both flange portions 1A, 1B projecting radially outward from the ends of the water pipes 1, 1 (an example of the first tubular member and the second tubular member) ( The case where the joining part of an example of a 1st flange part and a 2nd flange part) is reinforced is demonstrated. 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 to 3 show a flange joint in the middle of a fluid piping system (pipe). Both flange portions 1A and 1B formed in a disk shape projecting radially outward from the ends of both cast iron water pipes 1 and 1, which are examples of fluid pipes, include a plurality of connecting bolts 4A and nuts 4B ( In this embodiment, they are connected by 8 places). In the present embodiment, the side where the nut 4B is located is the first flange portion 1A, and the side where the head 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 4a of the connecting bolt 4A and the second flange portion 1B, respectively. Thus, the connecting bolt 4A, the nut 4B, and the washers 4C, 4C constitute a connecting mechanism that connects the flange portions 1A, 1B. The washers 4C and 4C may be omitted.

  A ring-shaped sheet-like gasket 2 is interposed between the flange portions 1A and 1B. In both flange portions 1A and 1B, a plurality of through-holes 3 (eight in this embodiment, each) penetrating in the flange joining direction (axial direction, hereinafter referred to as “joining direction”) are equally spaced in the circumferential direction. The connecting bolt 4A is inserted into the through holes 3, and the nut 4B is screwed and fixed to the distal end side of the male screw portion 4b of the connecting bolt 4A. In addition, both flange parts 1A and 1B of this embodiment are what is called RF type flange which provided the flat seat surface inside the through-hole 3. FIG.

  Below, in both flange parts 1A and 1B, the surface on which the water pipe 1 protrudes will be referred to as outer surfaces 1a and 1a in the joining direction. Further, the description will be made assuming that the radially outward surfaces of the flange portions 1A and 1B are the outer peripheral surfaces 1c and 1c.

  As shown in FIGS. 4 to 6 and 9, the reinforcing jig P includes a first clamping member 6 having a first pressing portion 6e that presses the outer surface 1a of the first flange portion 1A, and a second flange portion 1B. And a second clamping member 5 having a second pressing portion 5e that presses the outer side surface 1a. These pressing portions 6e, 5e are formed with fine irregularities, for example, or a rubber member is attached to the surfaces of both pressing portions 6e, 5e, so that the outer surfaces 1a, 1a of both flange portions 1A, 1B are attached. On the other hand, friction processing is performed so that frictional resistance is generated. In addition, it is not necessary to give friction processing to both the press parts 6e and 5e, and the aspect of friction processing is not specifically limited, either.

  Also, with both pressing portions 6e, 5e applied to the outer surfaces 1a, 1a of both flange portions 1A, 1B, respectively, both clamping members 6, 5 (both pressing portions 6e, 5e) are pulled in the joining direction ( There is provided a fastening mechanism 7 for fixing (in close proximity).

  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, A first base portion 6B (an example of a base portion) that extends outward from one side of the four sides of the outer surface 6a of the inserted portion 6A at one end portion of the portion 6A, and has a first pressing portion 6e, and a first base portion 6B A drop-off prevention arm 6 </ b> C extending from the side surface is integrally provided. The drop-off prevention arm 6C may be formed to extend from the distal end surface of the first base portion 6B, or the drop-off prevention arm 6C may be separately manufactured and joined to the first base portion 6B, and is not particularly limited.

  The inserted portion 6A is formed in a square shape in a side view (see the perspective view of FIG. 4), and inside the inserted portion 6A is a cylindrical interior that receives the insertion portion 5A of the second holding member 5 along the joining direction. A space 6c is formed. That is, as shown in FIG. 6, when the reinforcing jig P is attached to both the flange portions 1A and 1B, a second clamping member, which will be described later, at a position radially outward from the outer peripheral surface 1c of the first flange portion 1A. 5 is formed with an insertion portion 5A, and the first clamping member 6 is formed with an insertion portion 6A for receiving the insertion portion 5A therein along the joining direction.

  The cylindrical internal space 6c is formed in a square shape in a cross-sectional view, and is slightly larger than the square-shaped insertion portion 5A in a cross-sectional view. For this reason, the shape perpendicular to the joining direction of the outer surface 5a of the insertion portion 5A and the inner surface 6b of the insertion portion 6A is the insertion direction (tubular shape) when the insertion portion 5A is inserted into the cylindrical inner space 6c of the insertion portion 6A. Although it is slidable in the longitudinal direction of the internal space 6c, it is formed so that relative rotation around the insertion direction (around the axis along the longitudinal direction of the cylindrical internal space 6c) is impossible.

  Further, in the cylindrical internal space 6c, an opening is formed on the side opposite to the side where the first base portion 6B is formed, and the male screw portion 7a of the fastening bolt 7A can be inserted on the side where the first base portion 6B is formed. An insertion hole 6d through which the head 7b cannot be inserted is formed so as to penetrate the bottom of the inserted portion 6A (see the cross-sectional view in FIG. 4). 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 first base portion 6B is formed in a slightly tapered shape in a side view (refer to the plan view in FIG. 4), and the side opposite to the side on which the first pressing portion 6e is formed is inclined toward the tip side in a longitudinal sectional view. It is formed in a taper shape (see FIG. 4 cross-sectional view). Further, the tip portion of the surface of the first base portion 6B opposite to the insertion hole 6d is formed as a first pressing portion 6e perpendicular to the outer surface 6a of the inserted portion 6A. That is, the first base portion 6B has a function of supporting the first pressing portion 6e.

  The drop-off prevention arm 6C is an L-shaped or C-shaped member formed to extend from the side surface of the first base 6B (see the plan view of FIG. 4 and the perspective view of FIG. 4), and is a nut screwed to the connecting bolt 4A. It is formed larger in diameter than the outer periphery of the nut 4B so that at least a part of 4B can be enclosed. When the reinforcing jig P is mounted on both flange portions 1A and 1B, the drop-off preventing arm 6C abuts against the nut 4B from the inside toward the radially outward direction (see FIG. 6). Further, of the surfaces constituting the drop-off prevention arm 6C in a longitudinal sectional view, the surface opposite to the insertion hole 6d in the longitudinal direction of the cylindrical internal space 6c has a gap with respect to the first flange portion 1A when mounted. As shown in FIG. 4, the first pressing portion 6e is formed so as to be retracted toward the insertion hole 6d (see the sectional view in FIG. 4). Note that the first clamping member 6 and the second clamping member 5 may be mounted oppositely, and the drop-off preventing arm 6C may be brought into contact with the head 4a of the connecting bolt 4A, and is not particularly limited.

  As shown in FIGS. 7 to 8, the drop-off prevention arm 6C has a thickness of at least the edge portion 6Ca that contacts 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. Particularly, in the edge portion 6Ca of the drop-off preventing arm 6C in the present embodiment, the stepped portion 6Cc stepped down toward the first flange portion 1A is formed from the connecting portion between the first base portion 6B and the drop-off preventing arm 6C to the tip portion 6Cb. It is formed over. That is, a notch having an L-shaped cross section is formed in the edge portion 6Ca so as to be retracted toward the first flange portion 1A from the top surface 6Cd of the drop-off preventing arm 6C. The notch of the edge 6Ca is set to a size that allows a tightening tool (not shown) such as a ratchet or a spanner to tighten the nut 4B to be inserted. If such a step portion 6Cc (notch) is formed, a concave gap is formed between the side surface of the nut 4B and the side wall of the step portion 6Cc. It is easy to hook the tip part onto the nut 4B.

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

  As a result, even when the flanges 1A and 1B are distorted, deformed, or relatively displaced due to their own weight or an earthquake, the drop-off prevention arm 6C reliably comes into contact with the nut 4B. It can prevent more reliably that both flange parts 1A and 1B fall off.

  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 part 5B extending outward from the outer surface 5a of the insertion part 5A at one end of the insertion part 5A, and further outward from one side of the four sides of the hook-like part 5B. An extending second base portion 5C is integrally provided.

  The insertion portion 5A is formed in a square shape in a side view (see a perspective view in FIG. 5), and a cylindrical shape in which a male screw portion 7a of a fastening bolt 7A of a fastening mechanism 7 described later can be inserted into the insertion portion 5A. A cylindrical internal space 5c is formed. The inner diameter of the cylindrical inner space 5c is slightly larger than the outer diameter of the male screw portion 7a of the fastening bolt 7A.

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

  In the cylindrical internal space 5c, the side on which the flange 5B and the second base 5C are formed is formed with an opening, and the side opposite to the side on which the flange 5B and the second base 5C are formed is the fastening bolt 7A. A female screw portion 5d to which the male screw portion 7a can be screwed is formed so as to penetrate the bottom 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 second base portion 5C are formed. .

  The second base portion 5C is formed in a slightly tapered shape in a side view (refer to the plan view in FIG. 5), and is formed in a tapered shape that inclines toward the female screw portion 5d toward the distal end side in a longitudinal sectional view. (See FIG. 5 cross-sectional view). Further, the tip portion of the surface of the second base portion 5C on the side of the female screw portion 5d is formed as a second pressing portion 5e perpendicular to the outer surface 5a of the insertion portion 5A.

  As shown in FIGS. 6 and 9, the fastening mechanism 7 includes a fastening bolt 7A that is inserted into the cylindrical internal space 6c from the outside of the inserted portion 6A through the insertion hole 6d, and an inner peripheral surface of the inserting portion 5A. It is comprised from the internal thread part 5d formed in 5b, and the washer 7B interposed between the fastening bolt 7A and the collar-shaped part 5B. Note that the washer 7B between the fastening bolt 7A and the hook-shaped portion 5B may be omitted.

  The six views of the reinforcing jig P described above are shown in FIGS. In the six-sided view of the reinforcing jig P, the insertion portion 5A of the second clamping member 5 is inserted into the insertion portion 6A of the first clamping member 6 without going through the joint portion of both flange portions 1A and 1B. The state fixed by the fastening mechanism 7 is shown.

  The characteristic configuration of the reinforcing jig P in the present embodiment is that the drop-off prevention arm 6C has a step portion 6Cc formed from the first base portion 6B to the tip portion 6Cb on the edge portion 6Ca of the inner peripheral surface. is there. The drop-off prevention arm 6C is in contact with the head 4a of the connecting bolt 4A of the flange portions 1A and 1B or the nut 4B screwed to the connecting bolt 4A to prevent the reinforcing jig P from dropping off. Note that the drop-off prevention arm 6C in the present embodiment may be changed to drop-off prevention arms 61C, 62C, and 63C of modified examples described later. In this case, since only the shape of the drop-off preventing arm 6C is changed, the detailed drawing is omitted.

  Next, an operation process for 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 1 </ b> A and 1 </ b> B are removed and replaced with the connecting bolt 4 </ b> A and the nut 4 </ b> B. Sequentially, this replacement is performed on all existing bolts and nuts. At this time, in the present embodiment, the drop-off prevention arm 6C has a thin edge 6Ca as an insertion space for the tightening tool, so that the connecting bolt 4A and the nut 4B are configured by bolts and high nuts corresponding to the high nuts. There is no need to do. As a result, it is possible to use ordinary bolts and nuts, so that the apparatus cost can be saved.

  Next, as shown in FIG. 6, the insertion portion 5A of the second clamping member 5 is placed on the first clamping member 6 at a position radially outward from the outer peripheral surfaces 1c, 1c of both flange portions 1A, 1B. It inserts into the cylindrical internal space 6c of 6 A of insertion parts from 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 first pressing portion 6e and the second pressing portion 6e of the first clamping member 6 are formed. The second pressing portion 5e of the holding member 5 can be easily inserted in a state where the second pressing portion 5e is positioned in an intended relative positional relationship extending in the same direction.

  Next, the fastening bolt 7A is inserted from the outside of the insertion portion 6A in the joining direction into the cylindrical inner space 6c through the insertion hole 6d and temporarily fixed. The engagement between the insertion portion 5A and the insertion portion 6A and the temporary fixing of the fastening bolt 7A are temporarily performed in the joining direction by the first pressing portion 6e of the first clamping member 6 and the second pressing portion of the second clamping member 5. The distance from 5e is set to be slightly larger than the distance between the outer surface 1a of the first flange portion 1A and the outer surface 1a of the second flange portion 1B. That is, the size (insertion distance) of the overlapping portion between the insertion portion 6A and the insertion portion 5A in the joining direction and the interval between the first pressing portion 6e and the second pressing portion 5e can be appropriately set. . For this reason, even when the thickness is changed according to the nominal diameter or design pressure of both flange portions 1A, 1B, the first clamping member 6 and the second clamping member 5 can be adjusted by adjusting the size of the overlapping portion. The two flange portions 1A and 1B can be fastened and fixed satisfactorily.

  Subsequently, the reinforcing jig P is attached to both the flange portions 1A and 1B. At this time, the outer surface 6a of the inserted portion 6A on the side on which the first pressing portion 6e extends is made to abut against at least one of the outer peripheral surfaces 1c and 1c of both flange portions 1A and 1B from the radially outer direction. Further, the drop-off preventing arm 6C of the first clamping member 6 is brought into contact with or close to the nut 4B in the radially outward direction from the inside (see FIG. 7).

  The extension direction of the drop-off prevention arm 6C is set in the same direction as the direction in which the first clamping member 6 provided with the drop-off prevention arm 6C rotates together when the fastening bolt 7A is rotated to the tightening side. Yes. In other words, the drop-off prevention arm 6C has a fastening direction of the fastening bolt 7A from the side surface of the first base portion 6B of the first clamping member 6 (in this embodiment, the fastening bolt 7A is a right-hand thread, In the clockwise direction). For this reason, when the fastening bolt 7A is tightened, the drop-off preventing 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 drop-off prevention arm 6C on the radially inner side of the nut 4B, the reinforcing jig P may be mounted upside down. In this case, the drop-off preventing arm 6C abuts or approaches the head 4a of the connecting bolt 4A located on the second flange portion 1B in the radially outward direction from the inside.

  Next, the first pressing portion 6e of the first clamping member 6 presses the outer surface 1a of the first flange portion 1A, and the second pressing portion 5e of the second clamping member 5 is the outer surface 1a of the second flange portion 1B. The fastening bolt 7A is tightened until the pressure is pressed, and the insertion portion 5A and the insertion portion 6A are pulled in the joining direction. As a result, the reinforcing jig P rotates in the clockwise direction, and the drop-off preventing arm 6C and the nut 4B are reliably brought into contact with each other.

  After mounting the reinforcing jig P, similarly, another reinforcing jig P is sequentially mounted on the other nuts 4B in the flange portions 1A and 1B from the radially outward direction. In the present embodiment, the nut 4B to be mounted by the reinforcing jig P is mounted at a total of six places where a set of three places among the eight places is symmetrical with respect to the center of the first flange portion 1A. Note that the mounting of the reinforcing jig P may be performed on all the nuts 4B as necessary, or may be performed only on a part of a portion between adjacent nuts 4B.

  Next, the male screw portion 7a of the fastening bolt 7A is screwed into the female screw portion 5d of the insertion portion 5A, and the fastening mechanisms 7 of all the reinforcing jigs P are tightened. At this time, the fastening bolt 7A is located on the radially outer side from both the flange portions 1A and 1B, so that the fastening operation is easy. Moreover, since the drop-off preventing arm 6C is in contact with the nut 4B, the tightening posture is stabilized.

  When the fastening bolt 7A is fastened and fixed, both the pressing portions 6e and 5e of the both clamping members 6 and 5 move close together in contact with the outer side surfaces 1a and 1a of both 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 by the fastening force of the fastening bolt 7A. As a result, the nut 4B can be further tightened.

  Further, in a state where the reinforcing jig P is fixed to both the flange portions 1A and 1B, the center of the first pressing portion 6e and the second pressing portion 5e is a virtual annular surface in which the outer shape of the nut 4B is extended in the circumferential direction. It will be located in the area. For this reason, when the 1st press part 6e and the 2nd press part 5e move near, a fixed clearance gap is easy to be formed between the nut 4B and the 1st flange part 1A, and the nut 4B becomes 1st flange part 1A. On the other hand, there is no inconvenience of being in a single-contact state. For this reason, when the nut 4B is tightened, both flange portions 1A, 1B move uniformly in proximity.

  Next, tightening is performed using a tightening tool such as a ratchet or a spanner on all the nuts 4B that join both the flange portions 1A and 1B. At this time, the connecting bolt 4A is fixed using another tool such as a spanner.

  In the present embodiment, the stepped portion 6Cc stepped down toward the first flange portion 1A so that the edge portion 6Ca of the dropout preventing arm 6C is retracted in the joining direction with respect to the nut 4B is formed from the first base portion 6B to the tip portion. It is formed over 6 Cb (see FIG. 8). That is, around the nut 4B, the height of the drop-off preventing arm 6C is set to be smaller than the height of the nut 4B. For this reason, when the nut 4B is tightened, the tightening tool can be reliably inserted around the nut 4B.

  Next, the fastening bolt 7A and the nut 4B are alternately tightened until the tightening torque of the connecting bolt 4A, the nut 4B, and the fastening bolt 7A reaches a predetermined reference value (for example, 90 N · m at a nominal diameter of 250 mm). . As a result, the joint strength of the flange portions 1A and 1B by the reinforcing jig P can be further improved, and the separation and displacement of the flange portions 1A and 1B and the leakage of clean water accompanying them can be prevented more reliably. In addition, the seismic performance of the pipe can be improved.

  As shown in FIG. 9, in this embodiment, in addition to the fastening part of the fastening mechanism 7, it has the overlap part of the insertion part 5A and the to-be-inserted part 6A. For this reason, when a shearing force that causes the flange portions 1A and 1B to be displaced in the radial direction acts, or when a tensile force that pulls the flange portions 1A and 1B apart in the axial direction acts, 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 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 is made relatively short. It becomes possible. Therefore, it can prevent well that the front-end | tip of fastening bolt 7A protrudes outside the cylindrical interior spaces 5c and 6c. Moreover, 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. For this reason, even if a force in the shearing direction (radial direction) acts on both flange portions 1A and 1B and the fastening bolt 7A is slightly displaced in the radial direction, the male screw portion 7a of the fastening bolt 7A is inserted into the insertion hole. It is possible to prevent the fastening bolt 7A from being stretched or broken without coming into contact with 6d.

  As shown in FIG. 8, in the present embodiment, the surface of the drop-off prevention arm 6C that faces the outer surface 1a of the first flange portion 1A is separated from the outer surface 1a of the first flange portion 1A rather than the first pressing portion 6e. Therefore, even when the fastening bolt 7A is tightened, the drop-off preventing 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 drop-off prevention arm 6C, and the break-off prevention arm 6C can be prevented from being damaged.

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

  Hereinafter, only a different configuration from the above-described embodiment will be described in another 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.

[First Modification of First Embodiment]
In the edge portion 6Ca of the drop-off preventing 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 clamping member 6 to the distal end portion 6Cb. did. Instead, as shown in FIG. 16, a stepped portion 61Cc stepped down toward the first flange portion 1A may be formed only around the nut 4B on the edge portion 61Ca of the dropout prevention arm 61C. . In this case, since the thickness is secured from the first base portion 6B of the first clamping member 6 to the portion where the stepped portion 61Cc is formed in the drop-off prevention arm 6C, the rigidity of the drop-off prevention arm 6C can be increased.

[Second Modification of First Embodiment]
As shown in FIG. 17, the taper surface 6Ce that inclines toward the first flange portion 1A from the first base portion 6B to the tip end portion 6Cb of the first clamping member 6 on the step portion 6Cc of the drop-off preventing arm 6C. May be formed. As a result, the tightening tool of the nut 4B can be guided by the tapered surface 6Ce, so that the operation for obtaining a desired tightening torque becomes extremely easy. The tapered surface 6Ce may be formed on a part of the stepped portion 6Cc, and the portion other than the tapered surface 6Ce may be stepped, or may be formed only around the nut 4B as in the first modification described above. There is no particular limitation.

[Third Modification of First Embodiment]
As shown in FIG. 18, a tapered surface 62Cc may be formed from the top surface 62Cd of the drop-off 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.

[Fourth Modification of First Embodiment]
As shown in FIG. 19, the drop-off prevention arm 63C may be set to have a smaller thickness from the first base portion 6B of the first clamping member 6 toward the distal end portion 63Cb of the drop-off prevention arm 63C. Even in this case, the thickness of the edge 63Ca that contacts at least the nut 4B in the drop-off prevention arm 63C is set to be smaller than that of other portions. For this reason, it is possible to secure a sufficient thickness in the support portion (connecting portion with the first base portion 6B) of the drop-off prevention arm 63C and increase the rigidity while facilitating the tightening operation of the nut 4B. In addition, since the thickness only needs to be gradually reduced from the first base portion 6B toward the distal end portion 63Cb, processing is easy. Note that the first modification, the second modification, or the third modification may be combined with the fourth modification.

[Second Embodiment]
In the first embodiment described above, at least the edge portions 6Ca, 61Ca, 62Ca, and 63Ca that contact the nut 4B among the drop-off prevention arms 6C, 61C, 62C, and 63C are set to be smaller than the other portions. Instead, as shown in FIGS. 20 to 21, a thick washer 4Ca (between the nut 4B and the outer surface 1a of the first flange portion 1A so that the nut 4B is bulkier than the drop-off prevention arm 64C. You may employ | adopt the reinforcement structure of the junction part which inserted the example of the height adjustment member. In this case, it is possible to configure the top surface 64Cd on the same plane up to the edge portion 64Ca without making the thickness of the edge portion 64Ca of the drop-off prevention arm 64C smaller than other portions.

  Even in the case of the present embodiment, since the height of the drop-off prevention arm 64C is set to be smaller than the height of the nut 4B around the nut 4B, when tightening the nut 4B, a tightening tool is placed around the nut 4B. Can be inserted reliably. Moreover, since the edge portion 64Ca of the drop-off prevention arm 64C comes into surface contact with the thick washer 4Ca, the posture of the drop-off prevention arm 64C is easily stabilized. The thick washer 4Ca is not limited to an annular washer, and may be a wound coil-shaped washer or a disc spring washer with a cut end, and is particularly a height adjusting member that can withstand a desired tightening torque. It is not limited.

[Another embodiment 1]
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 FIGS. 22 to 23, the second clamping member 50 is configured by a U-shaped member having a pair of leg portions 50A and 50B, and the first clamping member 60 is formed on the leg portion 50B. It is comprised with the volt | bolt provided with the external threaded shaft part 70a screwed together by the penetrated internal thread hole 50a. The bolt serving as the first clamping member 60 also functions as a fastening mechanism 70 that fixes the bolt head 70b and the second clamping member 50 close to each other in the joining direction of the flange portions 1A and 1B. The 1st clamping member 60 has the 1st press part 60e which presses the 1st flange part 1A, and the 2nd clamping member 50 presses the outer surface 1a of the 2nd flange part 1B to the front-end | tip part of the leg part 50A. It has the 2nd press part 50e to do.

  Also in this embodiment, the drop-off prevention arm 6C is configured as an L-shaped or C-shaped member that is formed to extend from the side surface of the base 60B of the first pressing portion 60e (the base 60B that supports the first pressing portion 60e). Has been. In the drop-off prevention arm 6C, a step part 6Cc stepped down toward the first flange part 1A is formed from the connection part between the first base part 6B and the drop-off prevention arm 6C to the tip part 6Cb. Although the drop-off prevention arm 6C has the same configuration as that of the first embodiment, the configuration of the drop-off prevention arms 61C, 62C, and 63C in the above-described modification and the joint reinforcement structure in the second embodiment are described. It may be adopted.

[Another embodiment 2]
As shown in FIG. 24, the insertion part 51A of the second clamping member 51 is formed in a rectangular bar shape having an outer diameter that can be inserted into the insertion part 61A of the first clamping member 61, and the insertion of the first clamping member 61 is performed. The part 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 engaged with the insertion portion 51A in a relatively non-rotatable manner in the insertion portion 61A. 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. Also in this embodiment, the configuration of the drop-off prevention arms 6C, 61C, 62C, 63C in the above-described embodiment and the joint reinforcement structure in the second embodiment are employed.

[Other Embodiments]
(A) In the above embodiment, the two flange portions 1A and 1B are connected by the eight pairs of connecting bolts 4A and nuts 4B. However, depending on the nominal diameter, design pressure, etc. of the flange portions 1A and 1B, the connecting bolts The number of 4A and nut 4B can be adjusted suitably.

(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 clamping member 6 is brought into contact with the outer surface 1a of the first flange portion 1A, and the drop-off preventing arm 6C is moved from the radially inner side of the first flange portion 1A to the nut 4B. Abut or close. Next, the second pressing portion 5e is brought into contact with the outer surface 1a of the second flange portion 1B while the insertion portion 5A of the second clamping member 5 is inserted into the inserted portion 6A from the joining direction. Next, the male screw portion 7a of the fastening bolt 7A is screwed into the female screw portion 5d of the insertion portion 5A through the insertion hole 6d of the inserted portion 6A, and the both clamping members 6 and 5 are attached to both flange portions 1A and 1B. You can also

(C) Although the drop-off preventing arm 6C is provided only on the first clamping member 6 in the above embodiment, it may be provided on the second clamping member 5 or both the clamping members 6 and 5 as necessary. Further, the drop-off prevention arm 6C is simply not formed into a concave shape that turns from the radially inner side of both flange portions 1A, 1B to the radially outer side with respect to the head 4a or the nut 4B of the connecting bolt 4A. Further, it may be constituted by a rod-shaped member that comes into contact with the flange portions 1A and 1B from the radially inner side.

(D) In the above embodiment, the insertion portion 6A is provided in the first clamping member 6 and the insertion portion 5A is provided in the second clamping member 5. However, the insertion portion is provided in the second clamping member 5, It is good also as a structure which provides an insertion part in the 1st clamping member 6. FIG.

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

(F) In the above embodiment, the configuration in which both flange portions 1A and 1B are so-called RF-shaped flanges has been described. However, as long as the flange is joined, other flange joining may be used. It is good also as what is called GF type flange which provided.

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

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

1 water pipe (first cylindrical member, second cylindrical member)
1A 1st flange part 1B 2nd flange part 1a Outer side surface 4A Connection bolt 4a Head 4B Nut 4Ca Thick washer (height adjustment member)
5e 2nd press part 6e 1st press part 6B 1st base (base)
6C Fall-off prevention arm 6Ca Edge 6Cc Step 6Ce Tapered surface 63Cb Tip 7 Fastening mechanism P Reinforcing jig

Claims (5)

Attached to the joint where the first flange part projecting radially outward from the end of the first cylindrical member and the second flange part projecting radially outward from the end of the second cylindrical member are joined with a connecting bolt And
A first pressing portion that presses the outer surface in the joining direction of the first flange portion where the head or nut of the connecting bolt is disposed;
A second pressing portion that presses the outer surface of the second flange portion;
A fastening mechanism for fixing the first pressing portion and the second pressing portion in the vicinity of the joining direction;
A fall-off prevention arm that extends from the base of the first pressing portion and contacts the head or the nut from the inside toward the radially outward direction,
The drop-off prevention arm is a reinforcement of a joint part in which the thickness of at least the edge abutting against the head part or the nut is set smaller than that of the other part so as to retreat in the joining direction with respect to the head part or the nut. jig.   The joint reinforcing jig according to claim 1, wherein a stepped portion that is stepped down toward the first flange portion is formed at the edge portion.   The joint reinforcing jig according to claim 2, wherein the stepped portion is formed with a tapered surface inclined toward the first flange portion.   2. The joint reinforcing jig according to claim 1, wherein the drop-off preventing arm is set to have a thickness that decreases from the base toward the tip. Attached to the joint where the first flange part projecting radially outward from the end of the first cylindrical member and the second flange part projecting radially outward from the end of the second cylindrical member are joined with a connecting bolt Reinforced jig is
A first pressing portion that presses the outer surface in the joining direction of the first flange portion where the head or nut of the connecting bolt is disposed;
A second pressing portion that presses the outer surface of the second flange portion;
A fastening mechanism for fixing the first pressing portion and the second pressing portion in the vicinity of the joining direction;
A fall-off prevention arm that extends from the base of the first pressing portion and contacts the head or the nut from the inside toward the radially outward direction,
A reinforcing structure of a joint portion in which a height adjusting member is inserted between the head or nut and the outer surface of the first flange portion so that the head or nut is bulkier than the drop-off preventing arm.

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