JP7355898B2 - Joint reinforcement structure - Google Patents

Description

The present invention relates to a joint reinforcement structure for reinforcing a joint between flanges projecting radially outward from the ends of both cylindrical members.

As the above-mentioned reinforcing jig, for example, Patent Document 1 discloses a pair of clamping members each having a pressing part that comes into contact with a pair of flange joints, and a fastening mechanism that draws and fixes both clamping members in the joining direction of the joints. A configuration comprising the following is disclosed.

Further, one of the clamping members is formed with a C-shaped drop-off prevention arm that abuts from the radial direction against the head or nut of the connecting bolt that connects both the flange portions. This fall prevention arm prevents the reinforcing jig from falling off from both flanges.

Japanese Patent Application Publication No. 2014-141995

By the way, in repair valves, after the valve body is housed in the valve body, a short pipe that prevents the valve body from coming off is fixed to the valve body with bolts, and this fixed part is located radially outward from the valve body and the short pipe. It may form a bulge that bulges out. In this case, the distance in the circumferential direction between the head of the connecting bolt or the like existing in the flange portion of the short pipe or the like and the bulging portion is narrow, and the pressing portion of the reinforcing jig cannot be sufficiently inserted into the distance.
As a result, the portions of the reinforcing jig that face the outer circumferential surfaces of both flanges may be separated from both flanges by a large distance, and there is a risk that the reinforcing jig may fall off. Furthermore, due to this separation, when the clamping members are fastened with bolts or the like, the clamping members tend to rotate together and become misaligned, making it difficult to exert a desired pressing force.

In addition, in order to make the diameter of repair valves compact, the space on the inner side of the diameter is often narrower than the heads of the connecting bolts located on both flanges. It cannot be hooked onto parts etc. Therefore, if an unexpected external force is applied to the reinforcing jig, there is a risk that the reinforcing jig may fall off. Furthermore, the repair valve has an operation handle formed in the radial direction for opening and closing the valve body, which may limit the mounting position of the reinforcing jig.

Therefore, an object of the present invention is to rationally configure a joint reinforcement structure that can reliably reinforce the flange joint.

The joint reinforcement structure according to the present invention has a first flange portion projecting radially outwardly from the end of the first cylindrical member, and a second flange portion protruding radially outwardly from the end portion of the second cylindrical member. In a joint reinforcement structure for reinforcing a joint where a flange is joined with a connecting bolt, a plurality of first pressing parts press an outer surface of the first flange, and a plurality of first pressing parts press an outer surface of the second flange. A state in which a plurality of second pressing parts are formed in an annular shape along the circumferential direction of the first flange part or the second flange part, and the pressed state of the plurality of first pressing parts and the second pressing part is maintained. and a regulating portion that applies a force to press the plurality of first pressing portions and the second pressing portions inward in the radial direction to restrict movement toward the outside in the radial direction , the first cylindrical The member includes a cylindrical body that expands from the cylindrical body at a position between the plurality of connection bolts so as to protrude radially outwardly from a center line connecting the centers of the plurality of connection bolts in the circumferential direction of the first cylindrical member. A protruding bulge is formed, and at least one of the first pressing portion and the second pressing portion is formed in the circumferential direction of the bulging portion when viewed in the joining direction of the first flange portion and the second flange portion. It is at the point of pressing on the lateral area along .

Moreover, since the regulating part applies a force to press the first pressing part and the second pressing part inward in the radial direction while maintaining the pressing state of the first pressing part and the second pressing part, the first pressing part and the second pressing part The pressing posture of the second pressing portion is maintained over a long period of time, and the reinforcement of the flange joint portion is ensured.

According to this configuration, since the first pressing portion and the second pressing portion press the side region of the bulging portion of the first cylindrical member, the reinforcement of the flange joint portion becomes reliable.

Another feature is that the first clamping member includes two first pressing portions that press regions on both sides of the bulging portion along the circumferential direction.

According to this configuration, since the first pressing portion presses both sides of the lateral region of the bulging portion of the first cylindrical member, reinforcement of the flange joint portion becomes reliable.

It is an exploded perspective view of a cylindrical member. FIG. 3 is a longitudinal cross-sectional view showing a reinforcing jig attached to the flange portion of the cylindrical member. 3 is a view taken along arrow III-III in FIG. 2. FIG. 3 is a view taken along the line IV-IV in FIG. 2. FIG. 3 is a view taken along the line VV in FIG. 2. FIG. 3 is a view taken along the line VI-VI in FIG. 2. FIG. It is a figure showing the schematic structure of the first clamping member. It is a figure showing the schematic structure of the second clamping member. FIG. 3 is a perspective view showing a reinforcing jig in an attached state. FIG. 3 is a perspective view showing a reinforcing jig in an attached state. FIG. 3 is a perspective view of a reinforcing jig according to another embodiment 1. FIG. FIG. 7 is a perspective view of a reinforcing jig according to another embodiment 2. FIG.

EMBODIMENT OF THE INVENTION Below, embodiment of the reinforcement jig of the joint part based on this invention is described based on drawing. In this embodiment, as an example of the reinforcing jig P, a repair valve X (an example of the first cylindrical member or the second cylindrical member), an air valve L (an example of the first cylindrical member) or a branch pipe M ( An example of reinforcing the flange joint with the second cylindrical member 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.

FIG. 1 shows an exploded perspective view of the repair valve X, and FIG. 2 shows a longitudinal cross-sectional view of the repair valve X, the air valve L, and the branch pipe M in a state where they are joined. As shown in FIG. 1, the repair valve X includes a cast iron valve box Xa that accommodates a valve body (not shown) and a cast iron short pipe Xb. After the valve body is accommodated in the valve box Xa, the valve box Xa and the short pipe Xb are joined with the embedded bolts 4. In the short pipe Xb, a plurality of through holes 3a (four locations in this embodiment) are formed in the circumferential direction that penetrate in the joining direction (axial direction), and a groove portion 3d for accommodating the head 4a of the embedded bolt 4 is formed. has been done. Further, in the valve box Xa, holes 3b (four in this embodiment) with one end closed are formed in the circumferential direction. A female screw portion 3c is formed on the inner peripheral surface of the hole portion 3b, and by screwing the male screw portion of the embedded bolt 4 to the closed end surface of the hole portion 3b, the valve box Xa and the short pipe Xb are connected. Joined.

As a result, as shown in FIG. 5, a plurality of bulging portions 1b (in this embodiment, four portions) bulging radially outward from the repair valve X are formed in the circumferential direction. Note that the embedded bolt 4 in this embodiment is an example of a bolt with a hexagonal socket having a circular head 4a with a hexagonal hole formed therein, but, for example, a structure in which both threaded bolts are tightened with a nut may also be used. Not particularly limited.

As shown in FIGS. 1 and 2, an air valve L or a fire hydrant is attached to one end of the repair valve X with a seal member 21 interposed therebetween, and a seal member 22 is attached to the other end of the repair valve X. A branch pipe M of a water pipe or the like is attached in an interposed state. A disk-shaped flange portion 1A (an example of a second flange portion, hereinafter referred to as “second flange portion 1A”) is formed at one end of the repair valve , is joined to a disc-shaped flange portion La (an example of a first flange portion, hereinafter referred to as “first flange portion La”) protruding radially outward from the end of the air valve L by a connecting bolt 7. On the other hand, at the other end of the repair valve The part 1B is joined to a disc-shaped flange part Ma (an example of a second flange part, hereinafter referred to as "second flange part Ma") projecting radially outward from the end of the branch pipe M by a connecting bolt 7. Ru.

Both flange portions 1A, 1B of the repair valve A plurality of through holes 2a and 2b (in this embodiment, four holes each) are formed at equal intervals in the circumferential direction in the first flange portion La and the second flange portion Ma of the branch pipe M, respectively. ing. With the through holes 1a, 1a of both flange parts 1A, 1B of the repair valve X superimposed on the through holes 2a, 2b of the first flange part La of the air valve L and the second flange part Ma of the branch pipe M, They are joined using connection bolts 7. Although this embodiment shows an example in which the connecting bolts 7 are joined to four through holes, six or eight through holes may be formed depending on the outer diameter of the flange joint. Yes, but not particularly limited.

The connecting bolt 7 is composed of a first connecting bolt 7A and a second connecting bolt 7B. The first connecting bolt 7A includes a bolt portion 71 having a polygonal (hexagonal in this embodiment) head 71a and a male screw portion, and a polygonal (hexagonal in this embodiment) first nut 72. There is. Further, the second connecting bolt 7B includes a bolt portion 71 and a second nut 73 having a polygonal shape (hexagonal in this embodiment) that is bulkier than the first nut 72. Although details will be described later, the second connecting bolt 7B is used at the location where the reinforcing jig P is joined across the connecting bolt 7. Note that the first connecting bolt 7A and the second connecting bolt 7B may each be configured with the same standard, or each bolt portion 71 may be configured with a different standard. Furthermore, the head 71a of the bolt portion 71 and the nuts 72, 73 may be configured in a circular shape, and instead of the bolt/nut structure, an embedded bolt structure may be used without any particular limitation.

Hereinafter, in both flange parts 1A and 1B of the repair valve , 1d, and the radially outer surfaces of both flange portions 1A, 1B are assumed to be outer circumferential surfaces 1e, 1f. Similarly, in the first flange portion La of the air valve L, the surface exposed on the opposite side to the joint surface facing the second flange portion 1A of the repair valve X is the outer surface 2c, and the radially outer surface is the outer circumferential surface 2e. In the second flange part Ma of the branch pipe M, the surface exposed on the opposite side to the joint surface facing the first flange part 1B of the repair valve X is the outer surface 2d, and the radially outer surface is the outer circumferential surface 2f. explain.

[Joint part between air valve L and repair valve X]
The reinforcing jig P at the flange joint between the air valve L and the repair valve X will be explained using FIGS. 2 to 4 and 7 to 9. Here, regarding the relationship between the air valve L and the repair valve X, the air valve L will be described as a first cylindrical member and the repair valve X as a second cylindrical member. As shown in FIG. 2, the reinforcing jig P is attached to the joint between the first flange part La and the second flange part 1A.

As shown in FIGS. 3 and 4, the reinforcing jig P presses both side regions of the second nut 73 on the outer surface 2c of the first flange portion La where the second nut 73 of the second connecting bolt 7B is arranged. The first clamping member 6 equipped with two pressing parts 6B, 6B (an example of a first pressing part, hereinafter referred to as "first pressing part 6B") presses the outer surface 1c of the second flange part 1A. The second holding member 5 includes two pressing parts 5C, 5C (an example of a second pressing part, hereinafter referred to as "second pressing part 5C"). Further, a fastening mechanism 8 is provided that draws the first clamping member 6 and the second clamping member 5 in the joining direction of the flanges La and 1A (brings them close to each other) and tightens and fixes them. The outer surfaces 2c of the flange parts La and 1A are formed, for example, by forming fine irregularities on the pressing surfaces 6e and 5e of the pressing parts 6B and 5C, which face the flange parts La and 1A. , 1c may be subjected to friction processing so as to generate frictional resistance.

As shown in FIG. 7, the first holding member 6 is made of a metal member and integrally includes an inserted portion 6A and a first pressing portion 6B. The inserted portion 6A is formed in a bottomed rectangular tube shape in which the outer surface 6a and the inner surface 6b have a trapezoidal shape whose diameter increases as they approach the first flange portion La in a cross-sectional view (a cross-sectional view perpendicular to the joining direction). (See FIG. 7(a), which is a bottom view of FIG. 7(c)).
Further, the first pressing portion 6B is formed so as to extend outward from one of the four sides of the outer surface 6a of the inserted portion 6A in a bifurcated shape.

Inside the inserted portion 6A, a cylindrical internal space 6c for receiving an insertion portion 5A of the second clamping member 5, which will be described later, is formed along the joining direction of both flanges La and 1A (see FIG. 7(a) ), which is a VIIb-VIIb arrow view). That is, as shown in FIG. 9, when the reinforcing jig P is attached to both the flange parts La and 1A, the second clamping member 5 is attached to the second clamping member 5 at a position radially outer than the outer circumferential surface 2e of the first flange part La. An insertion portion 5A is formed, and the first holding member 6 is formed with an inserted portion 6A that receives the insertion portion 5A therein along the joining direction.

The cylindrical internal space 6c is formed into a trapezoidal shape when viewed in cross section, and is slightly larger than the outer diameter of the trapezoidal insertion portion 5A. Therefore, as shown in FIG. 9, the cross-sectional 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 the insertion portion 5A is inserted into the cylindrical internal space 6c of the inserted portion 6A. When inserted, it is possible to slide in the insertion direction (the longitudinal direction of the cylindrical internal space 6c), but relative rotation around the insertion direction (around the axis along the longitudinal direction of the cylindrical internal space 6c) is disabled. It is formed like this.

Further, in the cylindrical internal space 6c, an opening is formed on the side opposite to the side on which the first pressing portion 6B is formed. On the side of the cylindrical internal space 6c where the first pressing portion 6B is formed, there is an insertion hole 6d into which the male threaded portion 8a of the fastening bolt 8A can be inserted, but through which the head portion 8b cannot be inserted, through which the bottom of the inserted portion 6A is formed. An opening is formed so as to pass through it. Note that when the male threaded portion 8a of the fastening bolt 8A is inserted into the insertion hole 6d, a predetermined gap is formed between the outer peripheral surface of the male threaded portion 8a and the inner peripheral surface of the insertion hole 6d. (see Figure 2).

The first pressing portion 6B is formed into a bifurcated shape with the same arm length when viewed from the side (see FIG. 7(a)), and is formed into a tapered shape that moves away from the insertion hole 6d toward the distal end when viewed from the longitudinal section. (See Figure 7(b)). Further, the tip portion of the first pressing portion 6B on the opening side of the cylindrical internal space 6c is formed as a pressing surface 6e perpendicular to the outer surface 6a of the inserted portion 6A.

As shown in FIG. 3, the first pressing portion 6B is configured to press regions on both sides of the second nut 73 along the circumferential direction of the air valve L on the outer surface 2c of the first flange portion La. . That is, the first pressing part 6B extends outward from the outer surface 6a of the inserted part 6A while maintaining a distance larger than the outer diameter of the second nut 73, and forms a U-shaped nut that accommodates the second nut 73. A housing portion 6f is formed. When both the holding members 6, 5 are attached to both the flange portions La, 1A from the radial direction, the first pressing portion 6B presses against the first flange portion La without the nut accommodating portion 6f coming into contact with the second nut 73. The outer surface 2c will be pressed. Further, the pressing surface 6e of the first pressing portion 6B presses the vicinity of the second connecting bolt 7B located on the radially outer side of the seal member 21 interposed between the first flange portion La and the second flange portion 1A. That will happen. Therefore, while improving the sealing function of the seal member 21, it is possible to reliably prevent water from leaking from the gap between the second connecting bolts 7B.

The inserted portion 6A of the first holding member 6 is provided at both ends along the circumferential direction of an inner surface (outer surface 6a) facing the outer circumferential surface 2e of the first flange portion La and the outer circumferential surface 1e of the second flange portion 1A. It has a contact portion 6h that is formed to protrude in the radial direction and can come into contact with both the flange portions La and 1A (see FIG. 7(c)). This contact portion 6h has an inclined surface corresponding to the outer circumferential surface 2e of the first flange portion La. Although details will be described later, when the reinforcing jig P is fixed by the fastening mechanism 8, the rotation of the reinforcing jig P is prevented by the contact portion 6h abutting both the flange portions La and 1A. In addition, this contact part 6h may be provided only at one end of the inner surface facing the outer peripheral surface 2e of the first flange part La in the direction in which the reinforcing jig P rotates. Further, the contact portion 6h may be provided only on the inner surface facing either the outer circumferential surface 2e of the first flange portion La or the outer circumferential surface 2e, 1e of the second flange portion 1A. Furthermore, the shape of the contact portion 6h may be any shape, such as a plurality of convex portions.

As shown in FIG. 8, the second holding member 5 is made of a metal member, and includes an insertion portion 5A, a flange-shaped portion 5B extending outward over the entire circumference from the outer surface 5a of the insertion portion 5A, It is integrally provided with a second pressing portion 5C extending further outward from one of the four sides of the brim portion 5B. In a cross-sectional view, the insertion portion 5A has a trapezoidal shape whose diameter increases as the outer surface 5a approaches the second flange portion 1A, and the inner surface 5b is formed in the shape of a circular bottomed square tube (FIG. 8(c) (See FIG. 8(a) which is a plan view of ).

Inside the insertion portion 5A, a cylindrical internal space 5c is formed into which the male threaded portion 8a of the fastening bolt 8A can be inserted. The inner diameter of the cylindrical internal space 5c is larger than the outer diameter of the male threaded portion 8a of the fastening bolt 8A.

The brim portion 5B is formed into a trapezoidal shape in a cross-sectional view perpendicular to the joining direction, and has a cylindrical internal space 5c penetratingly formed in the center (see FIG. 8(a)).

In the cylindrical internal space 5c, an opening is formed on the side where the flange-shaped part 5B and the second pressing part 5C are formed, and a fastening bolt is formed on the side opposite to the side where the flange-shaped part 5B and the second pressing part 5C are formed. A female screw portion 5d into which the male screw portion 8a of the insert portion 8A can be screwed is formed as an opening so as to pass through the bottom of the insertion portion 5A (see FIG. b)). That is, the female threaded portion 5d is formed at the end of the inner surface 5b of the cylindrical internal space 5c of the insertion portion 5A on the opposite side to the side on which the brim portion 5B and the second pressing portion 5C are formed.

The second pressing portion 5C is formed into a bifurcated shape with the same arm length when viewed from the side (see FIG. 8(a)), and has a tapered shape that inclines toward the female screw portion 5d as it goes toward the tip side when viewed from the longitudinal section. (See FIG. 8(b)). Moreover, the tip of the surface of the second pressing portion 5C on the female screw portion 5d side is formed as a pressing surface 5e perpendicular to the outer surface 5a of the insertion portion 5A.

As shown in FIG. 4, the second pressing portion 5C is configured to press areas on both sides of the head 71a of the second connecting bolt 7B along the circumferential direction of the repair valve X on the outer surface 1c of the second flange portion 1A. It is composed of Furthermore, contact surfaces 5g are provided along both opposing sides of the polygonal head 71a. When the clamping members 6, 5 are inserted into the flange parts La, 1A and fixed by the fastening mechanism 8, if the contact part 6h contacts the flange parts La, 1A, rotation of the clamping members 6, 5 is prevented. be done. In addition, by bringing the contact surface 5g of the second pressing portion 5C into contact with both sides of the head 71a, the fastening force of the second connecting bolt 7B acts to reliably prevent rotation of both the clamping members 6, 5. I can do it. In this embodiment, the contact surface 5g is in contact with both opposing sides of the head 71a, but at least the surface opposing one side of the head 71a is in a non-contact state close to one side of the head 71a. It is good if they are formed in parallel.

Further, as shown in FIG. 4, a washer member 71c is interposed between the head 71a of the second connecting bolt 7B and the outer surface 1c of the second flange portion 1A, and the second pressing portion 5C is provided with a washer member 71c. A notch is formed to accommodate the washer member 71c (see FIG. 8(c)). As a result, the second clamping member 5 was inserted into the second flange portion 1A without being hindered by the washer member 71c, and both opposing sides of the head 71a of the second connecting bolt 7B came into contact with the contact surface 5g. In this state, the first pressing portion 6B presses the outer surface 1c of the second flange portion 1A. In this embodiment, a washer member 71c is also interposed between the head 71a of the first connecting bolt 7A and the nuts 72, 73 and the outer surfaces 2c, 1c of the flanges La, 1A.

As shown in FIG. 9, the fastening mechanism 8 includes the above-mentioned fastening bolt 8A inserted into the cylindrical internal space 6c from the outside of the inserted portion 6A through the insertion hole 6d, and formed on the inner surface 5b of the insertion portion 5A. It is composed of a female threaded portion 5d. The fastening bolt 8A has a male threaded portion 8a and a polygonal (hexagonal in this embodiment) head 8b. Note that the fastening bolt 8A is not limited to a hexagonal bolt, and may have any form such as a hexagonal socket bolt.

Next, a working process for attaching the reinforcing jig P to the joint between the two flanges La and 1A will be described.

As shown in FIG. 9, first, a plurality of existing bolts (not shown) at the joint between the flanges La and 1A are removed, replaced with the first connecting bolts 7A and the second connecting bolts 7B, and temporarily tightened. Next, the insertion portion 5A of the second clamping member 5 is inserted into the cylindrical internal space 6c of the inserted portion 6A of the first clamping member 6 at a position radially outer than the outer circumferential surfaces 2e, 1e of both flange portions La, 1A. Insert it along the joining direction. At this time, since the outer surface 5a of the insertion portion 5A and the inner surface 6b of the inserted portion 6A are formed in a trapezoidal shape that cannot be rotated relative to each other in a cross-sectional view, the second pressing portion 5C of the second holding member 5 and the first It can be easily inserted in a state where the holding member 6 is positioned in a desired relative positional relationship with the first pressing portion 6B extending in the same direction.

Next, the fastening bolt 8A is inserted into the cylindrical internal space 6c from the outside of the inserted portion 6A in the joining direction through the insertion hole 6d, and temporarily fixed. The engagement between the insertion portion 5A and the inserted portion 6A and the temporary fixing of the fastening bolt 8A are performed so that the distance between the pressing surface 6e of the first pressing portion 6B and the pressing surface 5e of the second pressing portion 5C is This is done so that the distance is slightly larger than the distance between the outer surface 2c of La and the outer surface 1c of the second flange portion 1A. That is, the size of the overlapping portion (insertion distance) between the insertion portion 5A and the inserted portion 6A in the joining direction and the interval between the pressing surface 5e and the pressing surface 6e can be set as appropriate. Therefore, even if the wall thickness of both flanges La and 1A is changed according to the nominal diameter and design pressure, by adjusting the size of the overlapping part, both clamping members 6 and 5 can be moved to both flanges La and 1A. It can be tightened and fixed well to 1A.

Next, while inserting the reinforcing jig P into both flange parts La and 1A from the radial direction so that the pressing parts 6B and 5C of both clamping members 6 and 5 are located on both sides of the second connecting bolt 7B, The outer surface 6a of the portion 6A is brought into contact with at least one of the outer circumferential surfaces 2e, 1e of both the flange portions La, 1A.
In this state, the pressing surface 6e of the first pressing section 6B is brought into contact with the outer surface 2c of the first flange section La, and the pressing surface 5e of the second pressing section 5C is brought into contact with the outer surface 1c of the second flange section 1A. The insertion section 5A and the inserted section 6A are pulled in the joining direction until they come into contact. At this time, the contact surface 5g comes into contact with both sides of the head 71a of the second connecting bolt 7B, and the washer member 71c is housed in the housing portion 5h.

Next, the fastening bolt 8A is tightened for final fixation. At this time, since the fastening bolt 8A is located at a position radially outer than both the flange portions La and 1A, the tightening operation is easy. On the other hand, as the tightening bolt 8A is tightened, the clamping members 6, 5 rotate relative to the flanges La, 1A, and there is a possibility that the clamping members 6, 5 may fall off.

However, the reinforcing jig P in this embodiment has the abutting part 6h at the end of the outer surface 6a facing the outer peripheral surfaces 2e, 1e of both the flange parts La, 1A, so that the abutting part 6h is connected to both the flange parts La. , 1A to prevent rotation of both the holding members 6, 5. Furthermore, since the contact surface 5g of the second pressing portion 5C is in contact with both sides of the head 71a, the fastening force of the second connecting bolt 7B acts to prevent rotation of both the clamping members 6, 5. I can do it. As a result, the tightening operation of the fastening bolt 8A becomes even easier, and the mounting posture of both the clamping members 6 and 5 can be stabilized. Note that the above-mentioned fastening bolt 8A may not be temporarily fixed, but only permanently fixed.

When one reinforcing jig P is permanently fixed to both flange portions La and 1A, the other reinforcing jigs P are also permanently fixed by repeating the same operation. Then, after fully fixing the reinforcing jig P to two locations of the second connecting bolts 7B, which are arranged opposite to the outer surfaces 2c and 1c of both the flange parts La and 1A, all the first connecting bolts 7A and the second connecting bolts 7B are fixed. The connecting bolt 7B is fully fixed, and the installation of the reinforcing jig P is completed. At this time, since the second connecting bolt 7B is constructed with a high nut type, the tightening work is easy. Furthermore, since the contact surface 5g of the second pressing portion 5C comes into contact with the head 71a of the second connecting bolt 7B, tightening only the second nut 73 prevents the bolt portion 71 from rotating together, making the tightening work more efficient. It is true. Note that the order of the main fixing of the reinforcing jig P and the main fixing of the first connecting bolt 7A and the second connecting bolt 7B may be changed as appropriate, or may be performed repeatedly. Further, in this embodiment, an example is shown in which the reinforcing jig P is attached to two of the four connecting bolts 7, but depending on the required strength of the joint, the reinforcing jig P may be attached to one or three or more connecting bolts 7. A reinforcing jig P may be attached to.

In this way, the insertion portion 5A is fixed inside the inserted portion 6A with the pressing portions 6B, 5C of the holding members 6, 5 in contact with the outer surfaces 2c, 1c of the flanges La, 1A. , the insertion portion 5A and the inserted portion 6A are in a state where they overlap in the joining direction. For this reason, when a shearing force that shifts the positions of both flanges La and 1A in the radial direction acts, or when a tensile force that pulls both flanges La and 1A apart in the axial direction acts, the pressing parts 6B and 5C move in the opening direction. Even when forces are received, these forces are received not only at the fastening portion of the fastening mechanism 8 but also at the overlapped portion of the insertion portion 5A and the inserted portion 6A, so that the fastening force applied to the fastening portion of the fastening mechanism 8 is reduced. can be prevented.

In addition, since the female threaded portion 5d of the insertion portion 5A is located close to the head 8b of the fastening bolt 8A, the threaded portion between the female threaded portion 5d and the male threaded portion 8a of the fastening bolt 8A is The head 8b of the bolt 8A approaches the position where it comes into contact with the upper surface 6g of the inserted portion 6A. That is, the distance between the head 8b of the fastening bolt 8A and the threaded portion in the joining direction is relatively small. Thereby, even if shearing force or tensile force is applied to both flange portions La and 1A, elongation and breakage of the fastening bolt 8A can be effectively prevented.

Furthermore, since the female threaded portion 5d is located at the overlapped portion of the insertion portion 5A and the inserted portion 6A within the cylindrical internal space 6c, it is possible to make the length of the fastening bolt 8A relatively short. . Furthermore, in the present embodiment, the insertion portion 5A and the inserted portion 6A are provided at the same location as the fastening bolt 8A at the radially outer positions of the outer circumferential surfaces 2e and 1e of both the flange portions La and 1A. become. As a result, it is possible to reduce both the dimensions in the joining direction and the dimensions in the radial direction of the reinforcing jig P and the fastening bolt 8A attached to both flange parts La and 1A, and it is possible to save space. can.

By attaching the reinforcing jig P in this way, the joint between the two flanges La and 1A can be reliably reinforced. At this time, by providing the first clamping member 6 and the second clamping member 5 with the bifurcated first pressing part 6B and second pressing part 5C, the connecting bolt is Even if the space at the radially inner portion is narrower than 7, the reinforcing jig P can be easily installed from the radially outer direction. Moreover, since the inner surface 6b of the inserted portion 6A and the outer surface 5a of the inserted portion 5A are formed in a trapezoidal shape whose diameter increases as it approaches the second flange portion 1A, a wide pressing area of the pressing portions 6B and 5C is ensured. be able to. As a result, the reinforcement strength of the flange joint of the repair valve X is effectively increased.

[Joint part between repair valve X and branch pipe M]
5 to 6 and FIG. 10 show an embodiment in which a reinforcing jig P is attached to the joint between the repair valve X and the branch pipe M. In addition, only the structure different from the embodiment in which the reinforcing jig P is attached to the joint between the air valve L and the repair valve X described above will be described. Here, regarding the relationship between the repair valve X and the branch pipe M, the repair valve X will be described as a first cylindrical member and the branch pipe M as a second cylindrical member.

At the joint between the air valve L and the repair valve X described above, a joint between the repair valve X and the branch pipe M is formed with a predetermined interval (for example, a joint surface interval of 100 mm to 400 mm). As shown in FIGS. 3 and 5, the reinforcing jig P attached to this joint has a circumferential position relative to the reinforcing jig P attached to the joint between the air valve L and the repair valve X. They are placed approximately 45 degrees apart. In other words, even if the joint surface spacing defined by the repair valve X is small, the reinforcing jigs P arranged above and below do not interfere with each other, making it possible to reinforce flange joints having any joint surface spacing. Note that the circumferential positions of the reinforcing jigs P in the vertical direction are not limited to being shifted by about 45 degrees, but may be shifted by 30 degrees, for example, and may be arranged at any angle. , it is not necessary to shift the circumferential position of each reinforcing jig P in the vertical direction.

By the way, recent repair valves X for shallow burial have a particularly narrow joint surface interval. In this case, it is preferable that the head 8b of the fastening bolt 8A of the reinforcing jig P fixed to the joint between the repair valve X and the branch pipe M is arranged on the outer surface 2d side of the second flange part Ma. In other words, by installing the reinforcing jig P fixed at the joint between the repair valve X and the branch pipe M shown in FIG. 2 upside down, the head 8b of the fastening mechanism 8 occupies the space between the joint surfaces Therefore, interference between reinforcing jigs P can be prevented. As a result, there is no need to shift the circumferential position of each reinforcing jig P in the vertical direction, and the final fixing of the fastening mechanism 8 and the connecting bolt 7 can be performed from the outer surface 2d side of the second flange portion Ma. It is efficient because it allows you to work.

When viewed in the joining direction as shown in FIG. 5, a plurality of bulging portions 1b that bulge radially outward from the cylindrical body of the repair valve X are arranged in the circumferential direction at the joint between the repair valve X and the branch pipe M. has been done. Further, a plurality of first connecting bolts 7A are arranged between each bulging portion 1b. Therefore, the circumferential interval between the first connecting bolt 7A and the bulging portion 1b is narrow, and it is difficult to insert the reinforcing jig P into the interval. Therefore, in the present embodiment, the first pressing portion 6B of the first holding member 6 is configured to press regions on both sides of the bulging portion 1b along the circumferential direction. As a result, when the reinforcing jig P is inserted from the radial direction of both the flange portions 1B and Ma, the first pressing portion 6B can be fully inserted.

Moreover, in this embodiment, as shown in FIG. 6, the second pressing portion 5C of the second clamping member 5 is arranged in a region where the connecting bolt 7 is not arranged. That is, by using a reinforcing jig P similar to the reinforcing jig P used for the joint between the repair valve X and the branch pipe M, mass production is achieved and manufacturing costs are saved. In addition, in this embodiment, since the reinforcing jig P is attached to a part where the connecting bolt 7 does not exist, a single second pressing part 5C is not formed on the second clamping member 5, and a single second pressing part 5C is not formed on the second clamping member 5. It may also be configured with part 5C.

Next, the work process of installing the reinforcing jig P will be briefly explained using FIG. 10. First, a plurality of existing bolts (not shown) at the joint between the flange parts 1B and Ma are removed, replaced with the first connecting bolts 7A, and temporarily tightened. Next, the insertion part 5A is inserted into the cylindrical internal space 6c of the inserted part 6A along the joining direction at a position radially outer than the outer peripheral surfaces 1f and 2f of both the flange parts 1B and Ma. Next, the fastening bolt 8A is inserted into the cylindrical internal space 6c from the outside of the inserted portion 6A in the joining direction through the insertion hole 6d, and temporarily fixed.

Next, while inserting the reinforcing jig P into both flanges 1B and Ma from the radial direction so that the first pressing portions 6B are located on both sides of the bulging portion 1b, the outer surface 6a of the inserted portion 6A is inserted between both flanges. It is brought into contact with at least one of the outer peripheral surfaces 1f and 2f of the portions 1B and Ma. Next, the male threaded part 8a of the fastening bolt 8A is screwed into the female threaded part 5d of the insertion part 5A inserted into the cylindrical internal space 6c, so that the head 8b of the fastening bolt 8A is attached to the upper surface of the inserted part 6A. Fix it completely until it touches 6g. At this time, also in this embodiment, by providing the contact portion 6h at the end of the outer surface 6a of the first clamping member 6, which faces the outer circumferential surfaces 1f and 2f of both the flanges 1B and Ma, both clamping members 6.5 can be prevented from rotating. In addition, the U-shaped inner peripheral surface (nut accommodating part 6f) sandwiched between the two first pressing parts 6B is configured to follow the outer peripheral shape of the bulging part 1b, so that the inner peripheral surface of the first pressing part 6B may be used as the contact portion 6h that contacts the bulge portion 1b. In this case, the contact portion 6h provided at the end of the first clamping member 6 may be omitted, and it is possible to prevent rotation of both clamping members 6 and 5.

When one reinforcing jig P is permanently fixed to both flange portions 1B and Ma, the other reinforcing jigs P are also permanently fixed by repeating the same operation. Then, after fully fixing the reinforcing jig P to the two locations of the bulging portion 1b disposed facing each other in the circumferential direction of the outer surfaces 1d and 2d of both the flange portions 1B and Ma, all the first connecting bolts 7A are fixed. After final fixing, installation of the reinforcing jig P is completed. Note that the effects of this embodiment are the same as those of the above-described embodiment, so detailed explanation will be omitted.

Hereinafter, another embodiment of the present invention will be described with reference to FIGS. 11 and 12, only with respect to the configuration that is different from the embodiment described above. Note that, in order to facilitate understanding of the drawings, the same members will be described using the same names and symbols.

[Alternative Embodiment 1]
As shown in FIG. 11, in this embodiment, a polygonal protrusion 61 is provided on the outer surface (outer surface 6a) of the first holding member 6 on the side opposite to the flange joint portion. When inserting both the clamping members 6 and 5 into the flange joint and permanently fixing them with the fastening mechanism 8, for example, by tightening the fastening bolt 8A of the fastening mechanism 8 while holding the protrusion 61 with a wrench (not shown), the reinforcement can be fixed. Rotation of the tool P can be prevented. Note that this protrusion 61 may be provided on the side surface located on the back side with respect to the tightening rotational direction of the fastening bolt 8A, and is not particularly limited as long as it can be held in a position with a wrench or the like. Further, the protrusion 61 is not limited to a polygonal shape, and may have any shape such as a circular shape.

[Alternative Embodiment 2]
As shown in FIG. 12, in this embodiment, a polygonal protrusion 62 with a groove 62a formed in the center is provided on the outer surface of the first holding member 6 on the side opposite to the flange joint. After the plurality of reinforcing jigs P inserted into the flange joints are temporarily fixed by the fastening mechanism 8, a holding member 63 made of a chain or the like is inserted into the groove 62a across each reinforcing jigs P, and then operated. By manually pulling the holding member 63 with the tool 64, the reinforcing jig P is pressed in the radial inward direction. Next, by permanently fixing both the holding members 6 and 5 using the fastening mechanism 8, rotation of the reinforcing jig P can be prevented. Next, when the holding member 63 is removed, the plurality of reinforcing jigs P are arranged in a desired posture with respect to the flange joint. Note that this holding member 63 may be left in place without being removed. In this case, the fixed posture of the reinforcing jig P can be maintained for a long period of time.

[Other embodiments]
(1) In the embodiment described above, the first clamping member 6 has the inserted portion 6A and the first pressing portion 6B integrally formed, but the inserted portion 6A and the first pressing portion 6B are formed as separate members. It may be configured. In this case, the first pressing part 6B is constituted by a movable member having a female thread, and the first pressing part 6B is moved directly by screwing a bolt, for example, and both the clamping members 6, 5 are brought close to the flange joint. It is conceivable that the device may be fixed in place. Further, the first pressing portion 6B may be moved using a wedge member or the like, and any method may be used to bring the holding members 6, 5 close to the flange joint portion and fix them. Further, the second pressing portion 5C of the second holding member 5 may be formed of a movable member.

(2) When the clamping members 6 and 5 are permanently fixed using the fastening mechanism 8, a rubber member is attached to the surfaces of the pressing surfaces 6e and 5e to prevent the rotation of the reinforcing jig P to achieve the desired frictional resistance. It is also possible to have a configuration in which this occurs. In this case, while preventing rotation of the reinforcing jig P, the rubber member is crushed and the adhesion of both the holding members 6 and 5 to the flange joint portion can be improved.

(3) A band member may be provided across the plurality of reinforcing jigs P to restrict movement of the plurality of holding members 6, 5 attached to the flange joint portion in the radial outward direction. This band member may be configured in a flat annular shape in which a through hole for accommodating the fastening bolt 8A is formed in the upper surface 6g of the first clamping member 6, and the upper surface 6g of the first clamping member 6 and the flange joint portion may be A configuration may be adopted in which a semi-annular member having an L-shape in cross section is connected to the outer surface of the opposite side with a bolt, and various configurations are envisaged.

(4) The configurations of the first clamping member 6, second clamping member 5, and fastening mechanism 8 in the embodiment described above can be changed as appropriate. For example, the second clamping member 5 is provided with the insertion portion 5A and the first clamping member 6 is provided with the inserted portion 6A, but the second clamping member 5 is provided with the inserted portion and the first clamping member 6 is provided with the inserted portion 6A. A configuration may also be adopted in which an insertion portion is provided. In this case, the second holding member 5 has a contact portion 6h formed to protrude in the radial direction at an end along the circumferential direction of the inner surface facing the outer circumferential surface of the flange joint portion. In addition, although the shapes of the insertion portion 5A of the second clamping member 5 and the inserted portion 6A of the first clamping member 6 are trapezoidal in cross-sectional view, the insertion portion 5A may be shaped like an ellipse or a rectangle in cross-sectional view. Any shape may be used as long as it is configured such that relative rotation around the joining direction is not possible when the inserted portion 6A is inserted. Moreover, the shape of the first pressing part 6B and the shape of the second pressing part 5C may be made the same shape. Moreover, the fastening mechanism 8 may have a bolt-and-nut structure, and is not particularly limited.

(5) The connecting bolt 7 that connects the flange joints in the embodiment described above is not limited to a hexagonal bolt, and may be of any form such as a double-threaded bolt or a hexagonal socket bolt.

(6) In the embodiment described above, an example was shown in which the reinforcing jig P is fixed to the flange joint between the repair valve X and the air valve L or the branch pipe M. Of course, the reinforcing jig P can be used for this purpose. Moreover, the repair valve X mentioned above is only an example, and the reinforcing jig P in the embodiment mentioned above can correspond to various repair valves X.

The reinforcing jig for joints according to the present invention can be used as a jig for reinforcing joints within fluid devices, between fluid devices and piping, between fluid devices, or between piping.

1A Second flange portion 1B First flange portion 1b Swelling portions 1c, 1d, 2c, 2d Outer surfaces 1e, 1f, 2e, 2f Outer peripheral surface 5 Second clamping member 5A Insertion portion 5C Second pressing portion 5h Accommodating portion 6 One clamping member 6A Inserted part 6B First pressing part 6h Contact part 7 Connection bolt 71a Head 71c Washer member 73 Nut 8 Fastening mechanism L Air valve (first cylindrical member)
La First flange part M Branch pipe (second cylindrical member)
Ma Second flange part P Reinforcement jig X Repair valve (first cylindrical member or second cylindrical member)

Claims (3)

Reinforcing the joint where the first flange portion protruding radially outward from the end of the first cylindrical member and the second flange portion protruding radially outwardly from the end portion of the second cylindrical member are joined with a connecting bolt. In the joint reinforcement structure,
a plurality of first pressing parts that press the outer surface of the first flange part;
a plurality of second pressing parts that press the outer surface of the second flange part;
The plurality of first pressing parts are formed in an annular shape along the circumferential direction of the first flange part or the second flange part, and the plurality of first pressing parts maintain the pressed state of the plurality of first pressing parts and the second pressing part. and a regulating part that applies a force that presses the part and the second pressing part radially inward to restrict movement outward in the radial direction ,
The first cylindrical member has positions between the plurality of connecting bolts such that the centers of the plurality of connecting bolts protrude radially outwardly from a center line connecting the centers of the plurality of connecting bolts in the circumferential direction of the first cylindrical member. A bulge is formed that bulges out from the cylinder body.
A joint portion in which at least one of the first pressing portion and the second pressing portion presses a side region of the bulging portion along the circumferential direction when viewed in the joining direction of the first flange portion and the second flange portion. Reinforced structure. A first clamping member including the first pressing part, a second clamping member including the second pressing part, the first clamping member and the second clamping member, and the first flange part and the second flange part. The joint reinforcement structure according to claim 1 , further comprising a fastening mechanism that fixes the parts in close proximity to each other in the joining direction. The joint reinforcement structure according to claim 2 , wherein the first holding member has two first pressing portions that press regions on both sides of the bulging portion along the circumferential direction.

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