JP4404254B2 - Flange joining device - Google Patents

Description

  The present invention relates to a flange joining apparatus that is attached to a flange between fluid pipes such as a water pipe, a gas pipe, and a plant pipe to reinforce the joining by the flange.

  Conventionally, in a pipe where flanges are joined together, a bending moment may act on the joint part of the flange in a certain direction depending on the weight of the pipe itself. A part will be pulled in the direction in which the joints are separated. Therefore, in order to reinforce the joint portion of the flange, an annular cover is attached so as to cover the entire flange, and one of the opposing sides of the flange and the cover is fastened together with a plurality of fastening bolts, and a plurality There is one that presses the entire flange by screwing a push bolt (see, for example, Patent Document 1). Thereby, the joint part of the flange prevented a reduction in the tightening force due to the joining force by the tightening bolt and the clamping force by the push bolt.

3-123187 microfilm (4th page, Fig. 3)

  However, in Patent Document 1, even if the clamping pressure is increased by a push bolt, the opposing side of the cover that faces the push bolt (the side to be fastened together) is in surface contact with the flange surface, so the unit area When the pressing force applied to the contact is reduced, the pressing force cannot be concentrated on a specific part, and the bending moment in a specific direction acts on the joint of the flange, the effective clamping force is applied to the place that is most likely to be separated. Could not work.

  The present invention has been made paying attention to such a problem. When a bending moment is applied to a flange-joined pipe, a pressing force is applied to a specific part of the flange joint where separation of the joint is expected. An object of the present invention is to provide a flange joining apparatus capable of concentrating.

In order to solve the above-mentioned problem, a flange joining apparatus according to claim 1 of the present invention is a pipe in which flanges formed at pipe end parts are joined together by fastening bolts , and is substantially U-shaped in cross-sectional view, and at least a 2 dividable formed diametrically, comprising an annular clamping member for covering the outer periphery of the joint portion of the flange, projecting to face each other inwardly of the clamping member can abut from both sides the flanges Two convex members, and front and rear surfaces of the clamping member facing the flange, each having a fastening bolt relief hole for joining the flanges, and at least one of the convex members facing each other, The pressing bolt is screwed to the clamping member, and the convex member is arranged at a specific portion of the flange joint portion where the joint is easily separated.
According to this feature, a specific part of the flange is pressed by pressing the flange from both sides to the specific part of the joint where the separation of the joint is expected when a bending moment is applied to the pipe by the convex members facing each other. The force applied per unit area can be increased to concentrate the pressing force. Moreover, since the holding member has an annular shape covering the outer periphery of the joint portion of the flange, and the annular holding member can be divided into two in the diametrical direction, it is only necessary to join the two annular holding members. It can be easily mounted on the outer periphery of the joint. Further, since the sandwiching member has an annular shape, a plurality of convex members can be arranged in a circular shape. Furthermore, since the clearance holes of the fastening bolts that join the flanges are formed on both front and rear surfaces of the sandwiching member that faces the flange, with the annular sandwiching member mounted on the outer periphery of the joint portion of the flange, The fastening bolt for joining the flanges can be retightened.

The flange joining apparatus according to claim 2 of the present invention is the flange joining apparatus according to claim 1, wherein the convex member facing the pressing bolt is formed integrally with the clamping member. It is characterized by being a part.
According to this feature, by making one of the convex members integrally formed with the clamping member, it is possible to perform a tightening operation by operating one pressing bolt, and the convex portion itself has a strong configuration. can do.

Invention of Claim 3 is a flange joining apparatus of Claim 1 or 2 , Comprising: The said piping is arrange | positioned and joined so that the longitudinal direction may become substantially horizontal, The said flange joined part of The convex member is arranged at least in the uppermost part.
According to this feature, a force is applied to the pipe arranged so that the longitudinal direction is substantially horizontal, in the direction in which the uppermost part of the flange joint is most separated due to the weight of the pipe itself. Therefore, the clamping pressure can be concentrated on the uppermost part of the flange joint.

  Examples of the present invention will be described below.

  An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a perspective view showing an overall image of a flange joining apparatus in Embodiment 1 of the present invention.

  Reference numerals 1 and 2 in FIG. 1 are pipes for flowing a fluid such as a water pipe and a gas pipe that are buried in the ground, and these two pipes 1 and 2 are made of a metal material. The pipes 1 and 2 are arranged so that the longitudinal directions thereof are horizontal, and circular flanges 3 and 4 are formed at the ends of the pipes 1 and 2, respectively.

  Four insertion holes 5 are formed in the flanges 3 and 4 of the pipes 1 and 2, and four fastening bolts 6 are inserted into the insertion holes 5 and screwed into the corresponding fastening nuts 7. By being combined, the flanges 3 and 4 of the pipes 1 and 2 are joined. The pipes 1 and 2 joined by the fastening bolt 6, the fastening nut 7, and the flanges 3 and 4 are used with the inside sealed.

  The semicircular cover bodies 8 and 9 that are divided into two in the diametrical direction as clamping members in this embodiment are mounted on the outer side of the joint portion where the flanges 3 and 4 are joined to each other from above and below. The attached cover bodies 8 and 9 can cover the entire outer periphery of the joint portion of the flanges 3 and 4. The cover bodies 8 and 9 are made of a metal material, and two semicircular cover bodies 8 and 9 having the same shape are used as one set.

  In the following, the description will be made with the left front side of FIG. 1 as the front. Extension portions 10 and 11 extending in the left and right direction are formed at the left and right ends of the cover bodies 8 and 9, respectively. Each has four insertion holes 25 and 26 penetrating in the vertical direction. The extended portions 10 and 11 of the upper and lower cover bodies 8 and 9 are joined to each other, and the four mounting bolts 12 are inserted into the insertion holes 25 and 26 from below and screwed into the corresponding mounting nuts 13. As a result, the cover bodies 8 and 9 can be combined.

  Screw holes 14 and 15 in which female screws are threaded are formed at the center of both front and rear surfaces of the semicircular cover bodies 8 and 9. The screw holes 14 and 15 are formed inside the cover bodies 8 and 9. The pressing bolts 16 and 17 can be screwed into the screw holes 14 and 15 from both the front and rear sides.

  Further, seat surfaces 18 and 19 are formed around the screw holes 14 and 15 of the upper and lower cover bodies 8 and 9 so that the pressing bolts 16 and 17 are smoothly screwed into the screw holes 14 and 15. It can be done.

  FIG. 2 is a view showing the flange joining apparatus as seen from the axial direction of the pipes 1 and 2. As shown in FIG. 2, the combined cover bodies 8 and 9 have a substantially annular shape. Semi-circular relief holes 20 and 21 are formed at positions corresponding to the fastening bolts 6 attached to the flanges 3 and 4 on both front and rear surfaces of the 8 and 9 so that the fastening bolts 6 are exposed. be able to. By forming the escape holes 20 and 21, the fastening bolt 6 that joins the flanges 3 and 4 to each other is retightened in a state where the cover bodies 8 and 9 are attached to the outer periphery of the joint portion of the flanges 3 and 4. Be able to.

  FIG. 3 is a central longitudinal cross-sectional view showing the pipes 1 and 2 and the flange joining device. As shown in FIG. 3, the flanges 3 and 4 at the ends of the pipes 1 and 2 are a fastening bolt 6 and a fastening nut. 7 and a ring-shaped gasket 22 formed of a material such as rubber is disposed between the flanges 3 and 4 of the pipes 1 and 2. By tightening the fastening bolt 6 and the fastening nut 7 that join the flanges 3 and 4 together, the gasket 22 is pressed from the front and rear direction, so that the inside of the pipes 1 and 2 can be kept liquid-tight. It has become.

  As shown in FIG. 3, the longitudinal sections of the cover bodies 8 and 9 attached to the joint portions of the flanges 3 and 4 are substantially U-shaped in a side view. It is attached so as to be sandwiched from the front-rear direction. Press bolts 16 and 17 are screwed into the screw holes 14 and 15 formed on both sides of the cover bodies 8 and 9, and screw portions 23 of the press bolts 16 and 17 as convex members in the present embodiment. 24 protrudes inward of the cover bodies 8 and 9.

  The screw parts 23 and 24 of the front and rear pressing bolts 16 and 17 are opposed to each other, and the front ends of the screw parts 23 and 24 are in contact with the flanges 3 and 4 from both front and rear sides. By tightening, the flanges 3 and 4 can be pressed and clamped from the front and rear directions.

  As shown by the arrows in FIG. 3, the pipes 1 and 2 are embedded in the ground so that the longitudinal direction is horizontal, depending on the weight of the pipes 1 and 2 themselves. While sinking downward, a force is applied in a direction in which the joint portion of the flanges 3 and 4 is pushed upward to bend. At that time, a bending moment is applied to the joint portion of the flanges 3 and 4, and a force is applied to the uppermost joint portion of the flanges 3 and 4 in the direction in which the joint is separated by the bending moment. At the same time, a force is applied to the lowermost bonding portion of the flanges 3 and 4 in the direction in which the bonding is pressed.

  The flange joining apparatus in the present embodiment applies a pressing force in the direction in which the uppermost joining portion of the flanges 3 and 4 is pressed by tightening the pressing bolt 16 provided in the upper cover body 8. Can be done. Therefore, when the bending pipes 1 and 2 are bent and a bending moment is applied to the joint portion of the flanges 3 and 4, it is possible to prevent the uppermost joint portion of the flanges 3 and 4 from being separated. Thus, the inside of the pipes 1 and 2 can be kept sealed.

  Further, the front end portion of the screw portion 23 of the pressing bolt 16 screwed to the upper cover body 8 is brought into contact with the flanges 3 and 4 from the front and rear directions, thereby pressing the flanges 3 and 4 with a small contact area. When the pressing bolt 16 is tightened, a large stress can be concentrated on the uppermost part of the flanges 3 and 4.

  Moreover, in the said Example, although the uppermost site | part of the junction part of the flanges 3 and 4 was demonstrated to the example as a specific site | part of the junction part of the flanges 3 and 4, this invention is not limited to this. However, depending on the direction in which the pipes 1 and 2 are bent, a force may be applied in the direction in which the joint is separated to the lower part of the joint part of the flanges 3 and 4 and the right and left parts. It is only necessary to attach the cover bodies 8 and 9 so that the tip end portion of the screw portion 23 of the pressing bolt 16 can come into contact with a portion that is assumed to be.

  Furthermore, in the above embodiment, the pressing bolts 16 and 17 are screwed into the screw holes 14 and 15 formed in the upper and lower cover bodies 8 and 9, respectively, but the present invention is not limited to this. In some cases, the pressing bolt 16 may be screwed only into the screw hole 14 of the upper cover body 8. By attaching the pressing bolt 16 only to the uppermost part of the joint portion of the flanges 3 and 4 where the joining is separated by the bending moment, it becomes possible to reduce the mounting work of the pressing bolt 16, The work efficiency when installing the pipes 1 and 2 is improved.

  Next, a flange joining apparatus according to the second embodiment will be described with reference to FIG. In addition, the same structure as the said Example is abbreviate | omitted.

  FIG. 4 is a central longitudinal sectional view showing the pipes 27 and 28 and the flange joining apparatus in the second embodiment of the present invention. Hereinafter, the left side of FIG. 27, 28 are joined by fastening bolts 31 and fastening nuts 32 inserted into flanges 29, 30 formed at the ends of the covers 27, 28, and cover bodies 33 attached to the joints of the flanges 29, 30. The vertical cross section 34 is substantially U-shaped in a side view, and is attached so as to sandwich the outside of the joined flanges 29 and 30 from the front-rear direction.

  Screw holes 35 and 36 into which female screws are threaded are formed on the rear surface sides of the upper and lower cover bodies 33 and 34, and the screw holes 35 and 36 penetrate into the cover bodies 33 and 34. . Then, pressing bolts 37 and 38 are screwed into the screw holes 35 and 36 from the rear, and screw portions 39 and 40 of the pressing bolts 37 and 38 as convex members in this embodiment are the cover body 33, 34 protrudes inward.

  As shown in FIG. 4, convex portions 41 and 42 as convex members in the present embodiment are formed on the front inner surfaces of the cover bodies 33 and 34. The convex portions 41 and 42 protrude inward so as to face the screw portions 39 and 40 of the pressing bolts 37 and 38 screwed into the screw holes 35 and 36 on the rear surface side of the cover bodies 33 and 34. The cover bodies 33 and 34 are integrally formed.

  The tip portions of the screw portions 39 and 40 of the pressing bolts 37 and 38 facing each other and the tip portions of the convex portions 41 and 42 protruding from the cover bodies 33 and 34 are arranged before and after the joint portion of the flanges 29 and 30. The joint portions of the flanges 29 and 30 can be pressed from the front and rear directions by tightening the pressing bolts 37 and 38 disposed on the both sides and arranged on the rear side, and the convex portions 41 and 42 are the cover body 33. , 34 are formed integrally with each other, whereby the convex portions 41, 42 can be formed firmly.

  Further, by attaching the pressing bolts 37 and 38 only to the rear side of the cover bodies 33 and 34, the mounting work of the pressing bolts 37 and 38 can be reduced, and the pipes 27 and 28 are installed. Work efficiency is improved when doing.

  Next, a flange joining apparatus according to the third embodiment will be described with reference to FIG. In addition, the same structure as the said Example is abbreviate | omitted.

  FIG. 5 is a view showing a flange joining device viewed from the axial direction of the pipe 43 in the third embodiment of the present invention, in which the flange 44 formed at the end of the pipe 43 is joined to the flange of the other pipe. These pipes 43 are fixed by fastening bolts 45 inserted through the flanges 44.

  As shown in FIG. 5, extending portions 48 and 49 are formed on the left and right ends of the upper and lower cover bodies 46 and 47 having a semicircular shape, and are attached to the extending portions 48 and 49. The upper and lower cover bodies 46, 47 are joined by the mounting bolt 50 and the mounting nut 51. Semi-circular relief holes 52 are formed on the front and rear surfaces of the cover bodies 46, 47 at positions corresponding to the fastening bolts 45 attached to the flange 44. The fastening bolts 45 are connected to the cover bodies 46, 47 is exposed to the outside.

  A plurality of screw holes (not shown) penetrating into the cover bodies 46 and 47 are formed on both front and rear surfaces of the joined annular cover bodies 46 and 47, and these screw holes (not shown) are formed. A pressing bolt 53 is screwed to the front. The pressing bolts 53 are arranged at the upper, lower, left and right portions of the joined annular cover bodies 46, 47, and the tips of the screw portions (not shown) of these pressing bolts 53 abut against the flange 44. It is touched.

  By tightening the pressing bolts 53 arranged on the front and rear sides of the cover bodies 46 and 47 from both sides, the tip of a screw portion (not shown) as a convex member in this embodiment is sandwiched between the joint portions of the flange 44 from the front and rear direction. Thus, a force can be applied in the direction in which the joint is pressed. Since the pressing bolt 53 is arranged in a circular shape, it can be pressed at any of the left, right, upper and lower portions of the joint portion of the flange 44.

  Further, although the press bolt 53 is screwed into all of the plurality of screw holes (not shown) formed in the joined annular cover bodies 46 and 47, the present invention is not limited to this. When the bending moment is applied to the pipe 43, the pressing bolt 53 may be screwed only to a predetermined portion of the joint portion of the flange 44 where the joint is separated.

  Since the plurality of screw holes are arranged in the combined annular cover bodies 46 and 47, a predetermined joint portion of the flange 44 is required regardless of the bending moment applied to the pipe 43 from any direction. The pressing bolt 53 can be arranged at the part. For example, in the maintenance of piping such as buildings, when a bending moment is applied from a direction different from the initially expected bending moment, it is added to the piping 43 only by changing the mounting position of the already installed pressing bolt 53. It can cope with bending moment.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope not departing from the gist of the present invention are included in the present invention. It is.

  For example, in the above embodiment, the present invention is applied to a joint portion of a flange of a pipe extending in the horizontal direction embedded in the ground, but the present invention is not limited to this, and is disposed in a building or the like. It can be applied to a vertically extending pipe.

It is a perspective view which shows the whole image of the flange joining apparatus in Example 1 of this invention. It is a figure which shows the flange joining apparatus seen from the axial direction of piping in Example 1 of this invention. It is a center longitudinal cross-sectional view which shows piping and the flange joining apparatus in Example 1 of this invention. It is a center longitudinal cross-sectional view which shows piping and the flange joining apparatus in Example 2 of this invention. It is a figure which shows the flange joining apparatus seen from the axial direction of piping in Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Piping 3, 4 Flange 5 Insertion hole 6 Fastening bolt 7 Fastening nut 8, 9 Cover body 10, 11 Extension part 12 Mounting bolt 13 Mounting nut 14, 15 Screw hole 16, 17 Press bolt 18, 19 Seat Surface 20, 21 Escape hole 22 Gasket 23, 24 Screw part 25, 26 Insertion hole 27, 28 Pipe 29, 30 Flange 31 Fastening bolt 32 Fastening nut 33, 34 Cover body 35, 36 Screw hole 37, 38 Press bolt 39 40 Screw part 41, 42 Convex part 43 Piping 44 Flange 45 Fastening bolt 46, 47 Cover body 48, 49 Extension part 50 Mounting bolt 51 Mounting nut 52 Relief hole 53 Press bolt

Claims (3)

In piping where flanges formed at the pipe ends are joined by fastening bolts,
In cross section substantially U-shaped, and is formed to be divided into two diametrically includes an annular clamping member for covering the outer periphery of the joint portion of the flange, projecting to face each other inwardly of the clamping member, at least two convex member can abut from both sides to the flange, are formed on front and rear surfaces of the clamping member facing the flange, and a relief hole fastening bolt for joining the flanges with each other, the convex At least one of the members facing each other is a pressing bolt screwed to the clamping member, and the convex member is disposed at a specific part of the flange joint part where the joint is easily separated. Flange joining device.   The flange joining apparatus according to claim 1, wherein the convex member facing the pressing bolt is a convex portion formed integrally with the clamping member. The flange according to claim 1 or 2 , wherein the pipes are arranged and joined so that their longitudinal directions are substantially horizontal, and the convex member is arranged at least at the uppermost part of the flange joint. Joining device.

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