JP4412596B2 - 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.

A microfilm of the actual application No. 2-332034 (No. 3-123187 No. 3)

  However, in Patent Document 1, since the tightening direction of the push bolt is parallel to the axial direction of the pipe, the valve main body is flanged when the pipe extending from the valve main body such as a switching valve is flanged. However, there is a risk that the push bolt may be pushed in.

  The present invention has been made paying attention to such problems, and when a bending moment is applied to a flange-joined pipe, the tightening force can be easily reduced without being obstructed by equipment related to the pipe. An object of the present invention is to provide a flange joining apparatus capable of preventing the above-described problem.

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 the other flange is connected to the outer peripheral part of one flange. A projecting piece extending over a part of the outer peripheral portion of the flange and provided with a female screw hole facing the central axis of the pipe is provided, and the projecting piece is a pressing member that can be pushed in toward the central axis of the pipe The pressing member is provided with a threaded portion that is screwed into the female screw hole of the protruding piece, a cylindrical portion that follows the threaded portion, and a tapered portion that is formed at the tip of the cylindrical portion. the push toward the pressing member to the central axis, nipped both flanges at the tapered portion, which has features in that engaged the outer edge and engaging the pushing at the end of the cylindrical portion other flange of the pressing member .
According to this feature, since the pressing member is pushed toward the central axis of the pipe and both flanges are clamped, even if equipment related to the pipe is disposed close to the pipe in the axial direction, it can be easily prevented. It is possible to prevent the tightening force from being lowered. Moreover, since the pressing member has a threaded portion that is screwed into the protruding piece, the pressing member can be easily pushed in by simply rotating the pressing member. Furthermore, since the cylindrical part which engages with the outer edge part of the other flange at the end of the pressing of the pressing member is provided, the clamping pressure at the joint part of the flange can be stably maintained.

The flange joining apparatus according to claim 2 of the present invention is the flange joining apparatus according to claim 1, wherein a plurality of the pressing members are provided for each protruding piece provided on the outer peripheral portion of one flange. It is characterized by being provided.
According to this feature, the tightening force can be enhanced by providing a plurality of pressing members on the outer peripheral portion of the flange.

The flange joining apparatus according to claim 3 of the present invention is the flange joining apparatus according to claim 1 or 2 , wherein the pressing member is arranged at a specific portion of the flange joint where separation of the joint is expected. It is characterized by having been made.
According to this feature, when a bending moment is applied to the flange-joined pipe, the joining portion can be strengthened by arranging the pressing member in a portion where the separation of the joint is expected in advance.

A flange joining apparatus according to a fourth aspect of the present invention is the flange joining apparatus according to any one of the first to third aspects , wherein the pipes are arranged and joined so that their longitudinal directions are substantially horizontal. The pressing member is arranged at the uppermost part of the flange joint.
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 shows a flange joining apparatus according to a first embodiment of the present invention, in which a normal fluid pipe is connected to a fluid pipe having a ball-shaped flexible pipe joint. 2 is an overall cross-sectional view of the joining apparatus, FIG. 2 is an AA cross-sectional view of FIG. 1, FIG. 3 is an operation explanatory view of a pressing member, (a) is a BB cross-sectional view of FIG. It is sectional drawing which shows the completion | finish state of pushing.

  Reference numeral 1 in FIG. 1 is a flange joining apparatus, and this flange joining apparatus 1 is attached to, for example, a flange that joins fluid pipes that are buried in the ground and used to reinforce joining by both flanges. It is a device.

  In this embodiment, the fluid pipe is described as a water pipe, but in FIG. 1, one water pipe 2 having a ball-shaped flexible pipe joint 4 and the other water pipe 10 are joined through circular flanges F and F1. Yes. The ball-shaped flexible pipe joint 4 is inserted into the outer periphery of one end of the water pipe 2, and can be rotated in a liquid-tight manner around the axis, and the inner spherical joint 4a is attached with the movement in the axial direction restricted. The outer spherical joint 4b is inserted into the outer spherical joint 4a so as to cover the outer periphery of the inner spherical joint 4a so as to be rotatable in a liquid-tight manner and provided with a flange F2 for connecting another water pipe (not shown) to the outer end. .

  The inner spherical joint 4a has a sliding surface that slides on the outer peripheral surface of one end of the water pipe 2 and is sealed by the first seal member S1, and is an outer spherical joint that is inserted into the outer circumference of the inner spherical joint 4a. The sliding surface with 4b is sealed by the second seal member S2. A flexible bellows 16 is mounted on the outer periphery 8a of the outer spherical joint 4b and the outer periphery 8b of the annular protrusion formed on the flange F side of the water pipe 2.

  Next, the flange joining apparatus 1 will be described in detail. The flanges F and F1 connecting the one water pipe 2 and the other water pipe 10 are joined by a plurality of fastening bolts B arranged in the circumferential direction. And in order to further reinforce the joint of a certain location on the outer periphery of the flange, the outer periphery of the flange F of the one water pipe 2 gets over the outer periphery of the portion corresponding to the specific location of the flange F1 of the other water pipe 10. A projecting piece 12 is provided.

  A certain place is a part where the separation of the joint is expected between the flanges F and F1 joined to each other, and the water pipes 2 and 10 buried in the ground so that the longitudinal direction is horizontal are caused by their own weight. When sinking downward, a bending moment is generated in the water pipes 2 and 10 on both sides of the joint between both flanges F and F1, and a force acts in the direction in which the uppermost parts of both flanges are separated from each other. The protruding piece 12 may be disposed at the uppermost part of the joints of both flanges F and F1.

  The protruding piece 12 is provided with a pressing member 14, that is, a pressing bolt 14 that can be pushed in toward and away from the central axis L of the water pipe 10. The pressing bolt 14 is connected to the water pipe as shown in FIG. 3. A male threaded portion T2 that is screwed into a female threaded hole T1 formed in the protruding piece 12 so as to face the central axis L, a small-diameter cylindrical portion 14a that follows the male threaded portion T2, and a taper formed at the tip of the cylindrical portion 14a. The taper portion 14b of the pressing bolt 14 is formed so as to clamp both flanges F and F1 when the pressing bolt 14 is pushed toward the central axis L.

  The female screw hole T1 of the protruding piece 12 has a central axis L from the female screw hole T1 of the single protruding piece 12 extending from the outer peripheral portion of the flange F of one water pipe 2 fastened via six fastening bolts B. The outer periphery of the taper part 14b or the cylindrical part 14a of the pressing bolt 14 contacts the upper outer surface of the flange F1 of the other water pipe 10, and is disposed at a position where it can be pressed.

  Next, the operation of the pressing bolt will be described with reference to FIGS. 3 (a) and 3 (b).

  As shown in FIG. 3A, at the initial stage when the pressing bolt 14 is screwed into the female screw hole T1, the tapered portion 14b at the tip of the female screw hole T1 is not yet in contact with the upper outer surface of the flange F1. When the bolt 14 is screwed in, when the corner portion of the upper outer surface of the flange F1 comes into contact with the tapered portion 14b, the flange F1 is pressed in the direction of the flange F by the action of the component force. The upper outer surface of F1 is strongly pinched.

  In this manner, the pressing bolt 14 is screwed toward the central axis L of the water pipes 2 and 10 to clamp the flanges F and F1, so that the ball-shaped flexible pipe joint 4 is disposed on the water pipe 2 side. However, the tightening force can be enhanced without being disturbed. Even if a ball-shaped flexible pipe joint, a valve, or the like is on the water pipe 10 side, the pressing bolt 14 can be screwed from the outside in the radial direction.

  The pressing bolt 14 can pinch the portion where the separation of the joints of the flanges F and F1 is expected by the rotating action. In this embodiment, when the pressing bolt 14 is completely pushed, the other water pipe 10 is pressed. Since the outermost surface of the uppermost flange F1 is pressed and held by a small-diameter cylindrical portion 14a stepped at the tip of the pressing bolt 14, the clamping pressure at the joint between the flanges F and F1 is kept stable. Can do.

  Next, the second embodiment will be described with reference to FIGS. 4 (a) and 4 (b).

  FIG. 4: shows the flange joining apparatus in Example 2, (a) is a side view which shows the partial cross section of the flange joining apparatus which reinforces joining of both the flanges which join a water pipe and a T-shaped water pipe, (b) is ( It is CC sectional drawing of a).

  In the present embodiment, both flanges F ′ and F′1 obtained by fastening the T-shaped water pipe 20 that faces vertically upward with the water pipe 18 via the six fastening bolts B are reinforced by the flange joining device 11. In one flange F ′ constituting the flange joining apparatus 11, the annular piece 24 extending over the outer peripheral portion of the flange F ′ 1 of the T-shaped water pipe 20 over a predetermined range of the outer peripheral portion thereof. Is protruding.

  And the four protrusion pieces 22 are arrange | positioned at the annular piece 24, and the four press bolts 14 which face the center axis line of the water pipe 10 are provided in these protrusion pieces 22 so that advancement / retraction is possible.

  Since the structure of the pressing bolt 14 has the same structure as that of the first embodiment, the description thereof is omitted. In the first embodiment, a protruding piece is arranged at the upper end portion of both flange joint portions as a specific portion of the flange joint portion. In the first embodiment, the four projecting pieces 12 are disposed at four locations on the circumference of the flange F ′, so that the tightening force can be enhanced.

  In addition, due to such an arrangement, the pressing bolt 14 is provided at the uppermost portion of the flange F ′ for structural reasons (interference with the flange F3 or a device not shown) due to the structure of the T-shaped water pipe 20 or the like facing vertically upward. Even when it cannot be arranged, it can cope.

  Next, the third embodiment will be described with reference to FIG. FIG. 5 is a front view of the flange joining apparatus according to the third embodiment.

  This flange joining apparatus 11 is similar to the first embodiment when a water pipe (not shown) embedded in the ground so that the longitudinal direction thereof is horizontal and a T-shaped water pipe 25 facing in the horizontal direction sinks downward due to its own weight. In addition, the vicinity of the uppermost part of the outer peripheral part where the separation of the joints of both flanges F ′ and F′1 is expected by the action of a bending moment is reinforced, and above the outer peripheral part of one flange F ′. A pair of projecting pieces 26 that extend over the outer peripheral portion of the other flange F′1 are disposed on both sides of the flange F′1 apart from each other.

  The pair of protruding pieces 26 are provided with two pressing bolts 14 facing the central axis of the T-shaped water pipe 25 so as to be able to advance and retreat. By pressing these two pressing bolts 14 to the final position, both flanges are provided. The two flanges F ′ and F′1 can be clamped by the two pressing bolts 14 in the vicinity of the uppermost part of the outer peripheral portion where separation of the joints F ′ and F′1 is expected.

  As described above, the embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to these embodiments. For example, in the above embodiments, a flange of a pipe extending in the horizontal direction embedded in the ground. However, the present invention is not limited to this, and can also be applied to a flange of a fluid pipe disposed in a building on the ground. In addition, although a pressing bolt is used as the pressing member, a pushing rod body with a tapered portion formed at the tip is pushed in the direction of the center axis of the pipe, and a stop pin or the like is inserted into the outer end of the pushing rod, for example. The position may be fixed.

  Further, in the above-described embodiment, the example in which the protruding piece is provided only on one flange is described. However, the protruding pieces are provided on both flanges so as to get over the other flange, and assembled in a zigzag shape, for example. The flange may be clamped with. Furthermore, the outer peripheral end face of the flange that comes into contact with the pressing bolt may be formed as a chamfered portion with a gentle inclination or roundness so that the pressing bolt can be pushed in smoothly.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole sectional view of the flange joining apparatus in Example 1 of this invention which connects a normal fluid pipe | tube to the fluid pipe | tube which has a ball-shaped flexible pipe joint. FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1. Similarly, it is an action explanatory view of a press member, (a) is a BB sectional view of Drawing 2, and (b) is a sectional view showing a pushing end state of a press member. The flange joining apparatus in Example 2 of this invention is shown, (a) is a side view which shows a partial cross section of the flange joining apparatus which reinforces joining of both the flanges which join a water pipe and a T-shaped water pipe, (b) is ( It is CC sectional drawing of a). It is a front view of the flange joining apparatus in Example 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flange joining apparatus 2 One water pipe 4 Ball-shaped flexible pipe joint 4a Inner spherical joint 4b Outer spherical joint 8a End outer periphery 8b Annular protrusion outer periphery 10 The other water pipe 11 Flange joining apparatus 12 Projection piece 14 Press bolt 14a Column Part 14b taper part 16 bellows 18 water pipe (pipe)
20 T-shaped water pipe 22 Protruding piece 24 Annular piece 25 T-shaped water pipe 26 Protruding piece B Fastening bolts F, F1 to F3 Flange L Center axis S1, S2 Seal member T1 Female threaded hole T2 Male threaded part

Claims (4)

In a pipe in which flanges formed at pipe ends are joined by fastening bolts, the pipe extends over the outer peripheral part of one flange over a part of the outer peripheral part of the other flange and faces the central axis of the pipe A protruding piece provided with a female screw hole is provided. The protruding piece is provided with a pressing member that can be pushed in toward the central axis of the pipe. The screw member is screwed into the female screw hole of the protruding piece. And a cylindrical portion following the threaded portion, and a tapered portion formed at the tip of the cylindrical portion. The pressing member is pushed toward the central axis, and both flanges are sandwiched between the tapered portions. A flange joining apparatus , wherein the cylindrical portion is engaged with an outer edge portion of the other flange at the end of pressing of the pressing member .   The flange joining apparatus according to claim 1, wherein a plurality of the pressing members are provided for each protruding piece provided on the outer peripheral portion of one flange.   The flange joining apparatus according to claim 1 or 2, wherein the pressing member is arranged at a specific portion of the flange joint where separation of the joint is expected. The pipe is joined its longitudinal direction are arranged to form a substantially horizontal, the uppermost portion of the flange joint, to one of the to the pressing member claims 1 were arranged 3 The flange joining apparatus as described.

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