JP2015178850A - Flange separation prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange separation prevention device which can complete the proper fastening work of a bolt in a short time irrespective of a pipe shape, and can surely prevent the separation of a flange.SOLUTION: A flange separation prevention device 10 comprises a grip member 11 having wall parts 11y, 11z which are erectly arranged at both sides of a base bottom part 11x, and gripping a pair of flanges 3d, 4d, and a pressing member 14 arranged at the grip member 11 so as to be retractable. An internal bottom face 11a of the base bottom part 11x is arranged so as to oppose external peripheral faces of a pair of the flanges 3d, 4d, and the separation of a pair of the flanges 3d, 4d is thus prevented. The flange separation prevention device also comprises a pressing direction conversion member 18 having pressed faces 12d, 13a which are pressed by the pressing member 14, and a flange pressing face 12a which presses one flange 3d to a direction which is different from a forward/backward direction of the pressing member 14.

Description

  The present invention relates to a flange separation preventing device for preventing separation between a pair of opposed flanges.

  Conventionally, a flange joined body (clamping member) having legs (walls) standing on both ends of a reinforcing jig (base part), and a bolt (pressing) provided on the flange joined body (clamping member) so as to be able to advance and retract And a flange that is disposed between the leg portions (wall portions) so that the outer peripheral surface of the flange faces the inner bottom surface of the reinforcing jig (base portion), and prevents the flange from separating. A separation prevention device is known (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-147243 (Page 4, FIGS. 1 to 3)

  However, when the flange separation preventing device of Patent Document 1 is applied to, for example, a flange of a pipe connection member such as a T-shaped tube or a valve, a bolt attached to the flange joined body is connected to another flange adjacent to the T-shaped tube. The distance between the bolts and the bolt tightening tool or the bolt itself interferes with other flanges, making it difficult to tighten the bolts properly. There is a problem that becomes longer.

  The present invention has been made paying attention to such problems, and a flange separation preventing device that can complete an appropriate bolt tightening operation in a short time regardless of the pipe shape and can surely prevent flange separation. The purpose is to provide.

In order to solve the above-mentioned problem, the flange separation preventing device of the present invention includes:
A holding member that has a wall portion erected on both sides of the base portion, and holds a pair of flanges; and a pressing member that is provided so as to be able to advance and retreat on the holding member. A flange separation preventing device that is disposed so as to face the outer peripheral surface of the flange, and prevents the pair of flanges from separating,
A pressing direction conversion member having a pressed surface pressed by the pressing member and a flange pressing surface that presses one flange in a direction different from the advancing / retreating direction of the pressing member is provided.
According to this feature, since it has a pressed surface pressed by the pressing member and a flange pressing surface that presses one flange in a direction different from the advancing / retreating direction of the pressing member, it is in a direction different from the advancing / retreating direction of the pressing member. Since the flange can be pressed, the pressing member can be easily tightened and the flange can be reliably prevented from being separated.

The flange separation preventing device of the present invention is
The pressing direction conversion member includes a holding piece that holds the pair of flanges between the pressing member, the holding piece includes the pressed surface and the flange pressing surface, and the pressed surface is Inclining with respect to the advancing / retreating direction of the pressing member, the clamping piece further includes an inclined surface that abuts against a wall inclined surface of the clamping member.
According to this feature, the sandwiching piece that sandwiches the pair of flanges between the sandwiching member includes the pressed surface that is tilted with respect to the advancing and retreating direction of the pressing member, and the inclined surface that is in contact with the inclined wall surface of the sandwiching member. The direction of the pressing force can be changed by the inclined surface, and the pressing force of the pressing member can be transmitted to the flange pressing surface, so that the pressing member can be easily tightened and the flange is reliably prevented from being separated. be able to.

The flange separation preventing device of the present invention of the present invention is
The pressing member is disposed substantially perpendicular to the base portion, and has an interposed member between the pressing member and the clamping piece, and the interposed member includes a pressed surface pressed by the pressing member, And an inclined surface that presses the pressed surface of the clamping piece.
According to this feature, since the pressing member is disposed substantially perpendicular to the base portion so as to be orthogonal to the separation force of the flange in the tube axis direction, the influence of the separation force in the tube axis direction of the flange on the pressing member is not affected. Since the interposed member has an inclined surface that presses the pressed surface of the clamping piece, the pair of flanges can be reliably pressed by the wedge effect, and separation of the flanges can be prevented.

The flange separation preventing device of the present invention of the present invention is
A plurality of the flange separation preventing devices are arranged and fixed at predetermined intervals on a positioning member formed by connecting a plurality of arc-shaped divided pieces with fastening members.
According to this feature, the flange separation preventing device is arranged and fixed at a predetermined interval on a positioning member formed by connecting a plurality of arc-shaped divided pieces with a fastening member. The separation preventing device can be easily attached to the flange at an appropriate position and direction.

(A) is a front view of the flange separation prevention apparatus which concerns on Example 1, (b) is a partial sectional side view. These are the JJ arrow line views of FIG. [Fig. 2] is a detailed view of a flange separation preventing device of a dotted-line enclosure K in Fig. 1. The dotted line enclosure part M is a figure which shows the attachment condition of the flange separation prevention apparatus which concerns on Example 1, and the dotted line enclosure part N is a figure which shows the attachment condition of the conventional flange separation prevention apparatus. (A) is a figure which shows the modification of the flange separation | spacing prevention apparatus which concerns on Example 1, (b) is a figure which shows another modification. (A) is a figure which shows the flange separation prevention apparatus which concerns on Example 2, (b) is a figure which shows the modification of the flange separation prevention apparatus which concerns on Example 2. FIG. (A) is a partial sectional side view of the flange separation | spacing prevention apparatus which concerns on Example 3, (b) is a X direction arrow directional view of (a). These are figures which show the modification of the flange separation prevention apparatus which concerns on Example 3. FIG.

  EMBODIMENT OF THE INVENTION The form for implementing the flange separation prevention apparatus which concerns on this invention is demonstrated below based on an Example.

  The flange separation preventing device according to the first embodiment will be described with reference to FIGS.

  The fluid pipe 1, the split T-shaped pipe 3, and the fluid valve 4 described below are part of piping constituting the pipe network, and are made of ductile cast iron for waterworks buried in the ground. The surface is covered with a mortar layer. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. In the present embodiment, the fluid in the fluid pipe is not limited to the clean water of the present embodiment, but may be, for example, industrial water, agricultural water, sewage, etc., or a gas-liquid mixture of gas and gas and liquid. Absent.

  As shown in FIGS. 1A and 1B, the branching member 2 attached in a watertight manner at the branching portion of the fluid pipe 1 constitutes a fluid pipe branched from the fluid pipe 1 substantially orthogonally. . The branching member 2 includes a split T-shaped tube 3 attached to the outer peripheral surface of the fluid pipe 1 and a fluid valve 4 attached to the split T-shaped tube 3.

  The split T-shaped tube 3 is a member having a two-divided structure that covers the fluid pipe 1 in the circumferential direction, and a covering plate 3a that covers the outer peripheral surface of the fluid pipe 1 in a water-tight manner over a substantially half circumference, The body 3b is connected to the plate 3a with bolts and nuts 5 and is water-tightly covered over the remaining substantially half circumference of the fluid pipe 1 and has a receiving portion 3c that opens in a branching direction from the fluid pipe 1. Yes. Further, on the both sides in the axial direction of the fluid tube 1 in the split T-shaped tube 3, separation preventing push wheels 6 and 6 having a two-part structure for sealing the inner surface of the split T-shaped tube 3 and the outer surface of the fluid tube 1 are mounted.

  The fluid valve 4 has a valve body (not shown) that opens and closes the flow path of the branch member 2 by rotating the valve shaft 4b. Further, the receiving port 3c and the fluid valve 4 have flanges 3d and 4d facing each other, and the flanges 3d and 4d are respectively connected to the flanges 3d and 4d at two locations on the upper and lower sides through a sealing material. The bolts and nuts 7 inserted through the bolt holes formed coaxially are tightened and fixed.

  The fluid pipe 1, the split T-shaped pipe 3, and the fluid valve 4 are a part of pipes constituting a pipe network embedded in the ground, and the sealing performance between the flanges 3d and 4d is caused by an external force or secular change due to an earthquake. May decrease. Thus, in order to prevent the sealing performance between the flanges 3d and 4d from deteriorating, as shown in FIGS. 1 (a), 1 (b) and 2, a pair of flange separation prevention devices 10 is provided on the flanges 3d and 4d. The flanges 3d and 4d are attached between the bolts and nuts 7 and 7 adjacent to each other in the circumferential direction. Hereinafter, the flange separation preventing device 10 will be described.

  As shown in FIG. 3, the flange separation preventing device 10 includes a pressing direction conversion member 18 including a clamping member 11, a clamping piece 12 and an interposed member 13, a pressing bolt 14 as a pressing member, a nut 15, and a washer 16. It is mainly comprised by.

  First, the clamping member 11 will be described. The holding member 11 is substantially U-shaped in a side view including a base portion 11x having an inner bottom surface 11a facing the outer peripheral surfaces of the pair of flanges 3d and 4d, and wall portions 11y and 11z erected on both ends of the base portion 11x. It is a member. On the inner wall of the wall portion 11y, a flange pressing surface 11b is formed which continues to the inner bottom surface 11a and presses the end surface in the tube axis direction of the flange. Further, the inner wall of the wall portion 11z includes an inner wall surface 11c continuous with the inner bottom surface 11a, and a wall inclined surface inclined at a predetermined angle so as to move away from the inner bottom surface 11a toward the flange pressing surface 11b connected to the inner wall surface 11c. A recess 11j having 11d is formed. The concave portion accommodates a sandwiching piece 12 and an interposed member 13 constituting a pressing direction changing member 18 described later.

  The inner wall surface 11c is a wall surface on which a side wall 13c of an interposed member 13 described later slides, and the wall portion inclined surface 11d is a wall surface on which an inclined surface 12b of a holding piece 12 described later slides. Further, a female screw 11e that penetrates substantially perpendicularly to the inner bottom surface 11a of the base portion 11x is provided, and a pressing bolt 14 is screwed into the female screw 11e.

  Next, the sandwiching piece 12 will be described. A flange pressing surface 12a that presses the end surface of the flange in the tube axis direction, an inclined pressing surface 12d that is slidable with the inclined surface 13d of the interposing member 13 and that is slidable with the inclined surface 13d of the interposing member 13 The member is provided with a movable inclined surface 12b and a bottom wall 12c that comes into contact with the inner wall surface 11c, has end surfaces 12f and 12f in the thickness direction, and has a substantially trapezoidal shape in side view. The end face 12f is provided with a groove 12e closed at both ends having a predetermined depth, and the elastic body 17 is accommodated between the groove 12e and the side wall 11f facing the groove 12e. The clamping piece 12 is held in the clamping member 11 by force. By holding the holding piece 12 in the holding member 11 with the elastic body 17 in this way, even when a bending force is applied to the holding piece 12, the elastic body 17 is deformed and the holding piece 12 follows. The flanges 3d and 4d can be prevented from being damaged without applying an excessive force to the flanges 3d and 4d.

  Next, the interposed member 13 will be described. The interposed member 13 is a member having a substantially trapezoidal shape in side view, which includes a pressed surface 13a and an inclined surface 13d pressed by the pressing surface 14b of the pressing bolt 14 and has a predetermined thickness.

  As shown in FIG. 3, the clamping piece 12 and the interposed member 13 are accommodated in the recess 11 j in the clamping member 11, and the pressing bolt 14 screwed into the inner bottom surface 11 a of the clamping member 11 is screwed in. When the pressed surface 13a of the interposed member 13 is pressed by the pressing surface 14b of the pressing bolt 14 and the inclined surface 13d of the interposed member 13 and the inclined pressing surface 12d of the holding piece 12 are slid and entered, the holding piece 12, the flange pressing surface 12a moves in a direction different from the screwing direction of the pressing bolt 14, and the flange pressing surface 12a moves substantially at right angles to the screwing direction of the pressing bolt 14. Then, the pressing force of the pressing bolt 14 is amplified by the wedge effect of the inclined surface 13 d of the interposed member 13 and the inclined pressing surface 12 d of the holding piece 12, and the flange pressing surface 12 a of the holding piece 12 and the flange pressing of the holding member 11 The pair of flanges 3d and 4d are sandwiched between the surface 11b and the pair of flanges can be prevented from separating.

  Next, an attachment process of the flange separation preventing device 10 will be described.

  As shown in FIGS. 1, 2 and 3, between the plurality of bolts and nuts 7, 7... That fasten and fix the flanges 3d and 4d, between the flange pressing surface 11b and the inner wall surface 11c of the clamping member 11. It arrange | positions so that the flanges 3d and 4d may be located, lightly clamps the pressing bolt 14, and lightly clamps a pair of flanges 3d and 4d between the flange pressing surface 12a of the clamping piece 12 and the flange pressing surface 11b of the clamping member 11. Then, the flange separation preventing device 10 is temporarily fixed to the flanges 3d and 4d. Similarly, the other plurality of flange separation preventing devices 10 are also arranged so as to be symmetric with respect to the pipe axes of the flanges 3d and 4d. In FIG. 2, six flange separation prevention devices 10 are arranged. However, according to the installation conditions, the flange separation preventing devices 10 are arranged between a plurality of bolts, nuts 7, 7... For tightening and fixing the flanges 3d, 4d. Alternatively, a plurality of bolts, nuts 7, 7,... 1A and 1B, the flange separation preventing device 10 is attached so that all the pressing bolts 14 are arranged on the fluid pipe 1 side, but all the pressing bolts 14 are fluid valves. You may attach so that it may be arrange | positioned at 4 side, and you may attach so that the press volt | bolt 14 may be arrange | positioned at the fluid pipe | tube 1 side and the fluid valve 4 side.

  Next, a tool such as a hexagon wrench is inserted into the hexagon hole 14a of the pressing bolt 14 and tightened with a predetermined tightening torque. When the pressing bolt 14 is tightened, the interposed member 13 is pressed by the pressing bolt 14 and enters along the inclined pressing surface 12d of the holding piece 12, and the pressing force of the pressing bolt 14 is amplified by the wedge effect. With the amplified pressing force, the pair of flanges 3 d and 4 d are clamped between the flange pressing surface 12 a of the clamping piece 12 and the flange pressing surface 11 b of the clamping member 11.

  Similarly, with respect to the other flange separation preventing devices 10 arranged in a plurality along the circumferential direction, the pair of flanges 3d and 4d can be tightened with the flange pressing surface 12a of the holding piece 12 and the holding member by sequentially tightening the pressing bolts 14. 11 and the flange pressing surface 11b between the flange pressing surfaces 11b in the circumferential direction, and the mounting step of the flange separation preventing device 10 is completed. In addition, it is preferable to tighten the pressing bolt 14 little by little evenly so as not to be single-tightened. Finally, the nut 15 is locked to the clamping member 11 via the washer 16 to prevent the pressing bolt 14 from rotating backward. The washer 16 is preferably a spring washer.

  Here, as shown in FIG. 4, the dotted line enclosing portion M is a view showing a tightening situation using the flange separation preventing device 10 according to the present invention, and the dotted line enclosing portion N is a conventional flange separation preventing device 50. It is a figure which shows the used tightening condition. In the flange separation preventing device 10 according to the present invention at the dotted line enclosing portion M, the pressing bolt 14 is disposed in the radial direction of the flange, so the hexagon wrench 60 for tightening the pressing bolt 14 interferes with the separation preventing pusher 6. The pressing bolt 14 can be tightened without difficulty. And since the pressing direction of the pressing bolt 14 is converted into the flange pipe axis method by the pressing direction converting member 18, the pressing bolt 14 can be tightened without difficulty. On the other hand, in the conventional flange separation preventing device 50 of the dotted line enclosing portion N, since the pressing bolt 54 is arranged in the tube axis direction of the flange, the hexagon wrench 60 interferes with the separation preventing presser wheel 6 and tightens the pressing bolt 54. It becomes difficult to carry out properly.

  The flange separation preventing device 10 of the present invention has the following operational effects.

  In the flange separation preventing device 10 of the present invention, the clamping piece 12 and the interposition member 13 are accommodated in the recess 11j in the clamping member 11, and the pressing bolt 14 screwed into the inner bottom surface 11a of the clamping member 11 is screwed. Then, the pressed surface 13a of the interposed member 13 is pressed by the pressing surface 14b of the pressing bolt 14, and the inclined surface 13d of the interposed member 13 and the inclined pressing surface 12d of the sandwiching piece 12 are made to enter while sliding. The flange pressing surface 12 a of the clamping piece 12 moves in a direction different from the screwing direction of the pressing bolt 14, and the flange pressing surface 12 a moves substantially at right angles to the screwing direction of the pressing bolt 14. Then, the pressing force of the pressing bolt 14 is amplified by the wedge effect of the inclined surface 13 d of the interposed member 13 and the inclined pressing surface 12 d of the holding piece 12, and the flange pressing surface 12 a of the holding piece 12 and the flange pressing of the holding member 11 The pair of flanges 3d and 4d can be held between the surface 11b and the pair of flanges can be prevented from separating.

  In the flange separation preventing device 10 according to the present invention, the pressing bolt 14 is disposed in the radial direction of the flanges 3d and 4d, so the hexagon wrench 60 for tightening the pressing bolt 14 interferes with the separation preventing pusher wheel 6. The pressing bolt 14 can be tightened without difficulty.

  Further, since the pressing force of the pressing bolt 14 is transmitted to the flange pressing surface 12a via the pressing direction converting member 18, the relative movement between the flange pressing surface 12a and the end surface of the flange 3d and the flange pressing surface 11b There is almost no relative movement between the end face of the flange 4d. As a result, there is almost no relative movement between the clamping piece 12 and the flange 3d. As a result, damage between the end face of the flange 3d and the flange pressing face 12a, and between the flange 4d and the flange pressing face 11b, and further, generation of rust can be suppressed, thereby reducing the pressing force of the pressing bolt 14. Since it can suppress, it can prevent reliably that a pair of flanges 3d and 4d leave | separate.

  The pressing bolt 14 is disposed substantially perpendicular to the base portion 11x. On the other hand, the pressing bolt 14 is orthogonal to the direction of the separating force of the flange, that is, the separating force in the tube axis direction of the flange. The impact on is small. Further, the sandwiching piece 12 that presses the flanges 3 d and 4 d is supported by two inclined surfaces, that is, the wall inclined surface 11 d of the sandwiching member 11 and the inclined surface 13 d of the interposed member 13. As a result, the separation force in the tube axis direction of the flange is dispersed and supported by the two inclined surfaces of the wall inclined surface 11d and the inclined surface 13d, so that the pressing bolt 14 is less susceptible to the flange separation force, The separation of the flange can be reliably prevented.

  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 of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the end face 12f of the sandwiching piece 12 is provided with the groove 12e having a predetermined depth and closed at both ends. However, the present invention is not limited thereto, and as a modification of the sandwiching piece 12 of the present invention, As shown in FIG. 5, the groove 12e ′ of the end face 12f ′ of the sandwiching piece 12 ′ may be a groove 12e ′ having both ends opened.

  Further, in the above embodiment, the flange pressing surface 12a, the inner bottom surface 11a, and the flange pressing surface 11b of the sandwiching piece 12 are not provided with any special coating or inclusions other than the rust prevention treatment. 11B, as shown in FIG. 5B, the intermediate body 12h is provided on the flange pressing surface 12a of the holding piece 12, and the intermediate body 11g and the flange pressing surface of the holding member 11 are provided on the inner bottom surface 11a of the holding member. 11b may be provided with an interposing body 11h to protect and insulate the flanges 3d and 4d. The interposers 11h, 11j, and 12h can be formed by bonding an insulator formed by resin or rubber, or by nylon coating, rubber lining, plastic coating, epoxy resin powder coating, or the like.

  A pipe joint according to the second embodiment will be described with reference to FIG. Note that the same components as those shown in the first embodiment are denoted by the same reference numerals and redundant description is omitted.

  In the flange separation preventing device 10 according to the first embodiment, the end surface 12f of the holding piece 12 is provided with a groove 12e having a predetermined depth and closed at both ends, and the elastic body 17 faces the groove 12e and the groove 12e. The sandwiching piece 12 is held in the sandwiching member 11 by the repulsive force of the elastic body 17. On the other hand, in the flange separation preventing device 20 according to the second embodiment, as shown in FIG. 6A, the side end surfaces 22f and 22f of the sandwiching piece 22 are provided with convex portions 22e. 22e is different in that it is slidably accommodated in a groove 21f formed in the clamping member 21.

  With such a configuration, the clamping piece 22 and the interposition member 13 can be easily assembled to the clamping member 21, and the clamping piece 22 can be prevented from falling down. Therefore, the flange separation preventing device 20 is provided between the pair of flanges 3d and 4d. Also when attaching, it can prevent the flanges 3d and 4d from being damaged. Moreover, since the convex part 22e is rigid, even if the clamping piece 22 receives bending force in the state which protruded from the recessed part of the clamping member 21, the clamping piece 22 inclines by fitting with the convex part 22e and the groove | channel 21f. Therefore, since an appropriate posture can be maintained, the effect of preventing flange separation can be surely exhibited.

  Further, as a modification of the second embodiment, as shown in FIG. 6B, the recess 21j ′ in the holding member 21 ′ is expanded to the bottom surface 21a ′, and the interposed member 23 is inclined in the recess 21j ′. It can also be set as the structure which accommodates the extension part 23e of the surface 23d. By comprising in this way, a pair of flange 3d, 4d can be pressed over the stroke whole length of the press volt | bolt 14, preventing the fall of the clamping piece 22. FIG.

  Also in the second embodiment, an insulator in which resin or rubber is molded on the flange pressing surface 22a of the clamping piece 22, the inner bottom surfaces 21a and 21a 'of the clamping members 21 and 21', and the flange pressing surfaces 21b and 21b '. The inclusion may be formed by bonding, nylon coating, rubber lining, plastic coating, epoxy resin powder coating, or the like.

  Next, the flange separation preventing device 30 according to the third embodiment will be described with reference to FIGS. It should be noted that the same components as those shown in the above-described embodiment are denoted by the same reference numerals and redundant description is omitted.

  As shown in FIG. 7A, unlike the first and second embodiments, the flange separation preventing device 30 is not provided with the interposition members 13 and 23, and the sandwiching piece 32 is directly formed by the inclined pressing surface 34 a of the pressing member 34. Pressed. The inclined pressing surface 34a of the pressing member 34 has a tapered inclined surface, and the inclined surface of the inclined pressing surface 34a presses the inclined pressing surface 32d of the holding piece 32, so that the pressing force of the pressing member 34 is amplified by the wedge effect. The pair of flanges 3d and 4d are held between the flange pressing surface 32a of the holding piece 32 and the flange pressing surface 31b of the holding member 31 by the amplified pressing force. Separation can be reliably prevented.

  Further, as shown in FIGS. 7A and 7B, a plurality of clamping members 31 are integrally attached to the positioning member 37, and have a predetermined interval along the circumferential direction of the pair of flanges 3d and 4d. It can also be installed to have.

  The positioning member 37 is composed of divided pieces 37a and 37b, and an annular member having an open portion 37e partially connected to each other by overlapping portions 37c in which the ends of the divided pieces 37a and 37b overlap each other with bolts and nuts 38. It is configured. Further, holes 37d are formed in each of the divided pieces 37a and 37b at a predetermined interval in the circumferential direction, and the protrusions 31k of the clamping member 31 are inserted into the holes 37d, and the flange separation preventing device 30 is positioned by the bolts 39. It is fixed to the member 37.

  In this way, the flange separation preventing device 30 fixed to the positioning member 37 loosens the bolts and nuts 38 and widens the gaps of the open portions 37e between the split pieces 37a and 37b, and the diameters of the flanges 3d and 4d. Since it can be attached from the outside in the direction, the plurality of clamping members 31 can be easily attached at a predetermined interval along the circumferential direction of the pair of flanges 3d, 4d at a time, and the assembly work can be shortened. it can.

  As shown in FIG. 7B, the split pieces 37a and 37b of the positioning member 37 are configured to bend in the plate width direction. However, as shown in FIG. The divided pieces 37a ′ and 37b ′ may be configured to be bent in the plate thickness direction. In addition, it replaces with the flange separation prevention apparatus 30 of Fig.7 (a), (b), and the positioning members 37 and 37 are added to the flange separation prevention apparatus 10 of Example 1, and the flange separation prevention apparatuses 20 and 20 'of Example 2. It goes without saying that 'can be used.

DESCRIPTION OF SYMBOLS 1 Fluid pipe 3d Flange 4d Flange 10 Flange separation prevention apparatus 11 Clamping member 11a Inner bottom surface 11d Wall part inclined surface 11x Base part 11y Wall part 11z Wall part 12, 12 'Nipping piece 12a Flange pressing surface 12b Inclined surface 12d Inclined pressing surface ( Pressed surface)
13 Interposition member 13a Pressed surface 13d Inclined surface 14 Press bolt (pressing member)
14b Pressing surface 18 Pressing direction conversion member 20, 20 'Flange separation preventing device 21, 21' Holding member 22 Holding piece 23 Interposing member 30 Flange separation preventing device 31 Holding member 32 Holding piece 37 Positioning member

Conventionally, a flange joined body (clamping member) having legs (walls) standing on both ends of a reinforcing jig (base part), and a bolt (pressing) provided on the flange joined body (clamping member) so as to be able to advance and retract And a flange that is disposed between the leg portions (wall portions) so that the outer peripheral surface of the flange faces the inner bottom surface of the reinforcing jig (base portion), and prevents the flange from separating. A separation prevention device is known (see, for example, Patent Document 1). In addition, there is also a type in which a flange is sandwiched between contact plates (wall portions) provided at bent portions standing at the ends of a pair of arms (base portions) to prevent the flanges from being separated ( For example, see Patent Document 2).

Japanese Patent Laying-Open No. 2005-147243 (Page 4, FIGS. 1 to 3) JP-A-11-22501 (4th page, FIG. 4 to FIG. 5)

However, when the flange separation preventing device of Patent Document 1 is applied to, for example, a flange of a pipe connection member such as a T-shaped tube or a valve, a bolt attached to the flange joined body is connected to another flange adjacent to the T-shaped tube. The distance between the bolts and the bolt tightening tool or the bolt itself interferes with other flanges, making it difficult to tighten the bolts properly. There is a problem that becomes longer. Also in Patent Document 2, there is a problem that the distance between the knob and the flange is close, and the knob and the flange interfere with each other so that the contact plate cannot be brought into contact with the flange appropriately.

In order to solve the above-mentioned problem, the flange separation preventing device of the present invention includes:
Comprising a clamping member for clamping a pair of flanges which have a wall portion which is erected on both sides of the base portion, the inner bottom surface of said base portion is disposed so as to face the outer peripheral surface of the pair of flanges, said pair A flange separation preventing device for preventing the flange of the flange from separating,
A pressing direction conversion member having a pressed surface that is pressed by a pressing member provided in the clamping member so as to be able to advance and retract, and a flange pressing surface that presses one flange in a direction different from the advancing / retreating direction of the pressing member; It is characterized by.
According to this feature, since it has a pressed surface pressed by the pressing member and a flange pressing surface that presses one flange in a direction different from the advancing / retreating direction of the pressing member, it is in a direction different from the advancing / retreating direction of the pressing member. Since the flange can be pressed, the pressing member can be easily tightened and the flange can be reliably prevented from being separated.

The flange separation preventing device of the present invention is
The pressing direction changing member prior SL comprises a clamping piece for clamping a pair of flanges,該挟Jihen has a pressed surface that is inclined with respect to forward and backward direction before Symbol pressing member, the wall inclination of the clamping member It is characterized by and a slanted surface abutting the surface.
According to this feature, the sandwiching piece that sandwiches the pair of flanges between the sandwiching member includes the pressed surface that is tilted with respect to the advancing and retreating direction of the pressing member, and the inclined surface that is in contact with the inclined wall surface of the sandwiching member. The direction of the pressing force can be changed by the inclined surface, and the pressing force of the pressing member can be transmitted to the flange pressing surface, so that the pressing member can be easily tightened and the flange is reliably prevented from being separated. be able to.

Claims (4)

A holding member that has a wall portion erected on both sides of the base portion, and holds a pair of flanges; and a pressing member that is provided so as to be able to advance and retreat on the holding member. A flange separation preventing device that is disposed so as to face the outer peripheral surface of the flange, and prevents the pair of flanges from separating,
A flange separation preventing device comprising a pressing direction conversion member having a pressed surface pressed by the pressing member and a flange pressing surface that presses one flange in a direction different from the advancing / retreating direction of the pressing member. .   The pressing direction conversion member includes a holding piece that holds the pair of flanges between the pressing member, the holding piece includes the pressed surface and the flange pressing surface, and the pressed surface is 2. The flange separation preventing device according to claim 1, further comprising an inclined surface that is inclined with respect to the advancing / retreating direction of the pressing member, and wherein the holding piece abuts against a wall inclined surface of the holding member.   The pressing member is disposed substantially perpendicular to the base portion, and has an interposed member between the pressing member and the clamping piece, and the interposed member includes a pressed surface pressed by the pressing member, The flange separation preventing device according to claim 2, further comprising an inclined surface that presses a pressed surface of the clamping piece.   4. A plurality of said flange separation preventing devices are arranged and fixed at predetermined intervals on a positioning member formed by connecting a plurality of arc-shaped divided pieces with fastening members. The flange separation prevention device according to any one of the above.

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