JP2014224577A - Flange separation prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flange separation prevention device capable of mounting an installation member and a holding member to the proper position of a flange with a small number of persons.SOLUTION: A flange separation prevention device 1 prevents flanges F1, F2 from separating with each other by holding the flanges F1, F2 with respect to the opposite flanges F1, F2 in a contact state; comprises division members 7, 7; and includes an installation member 4 in which a plurality of holding members 3 is connected in a falling-off prevention state. In the installation member 4, the division members 7, 7 are connected in a rotatable manner by a connection shaft 10 while leaving both free ends 4a, 4a of the installation member 4.

Description

  The present invention relates to a flange separation preventing device that prevents a pair of flanges from separating.

  A conventional flange separation preventing device is an annular shape comprising a plurality of clamping members that are substantially U-shaped and clamp a pair of flanges in the tube axis direction, and half-divided divided members that are installed along the circumferential direction of each clamping member. With this construction member, a pair of flanges are sandwiched with high strength in the direction of the pipe axis of the fluid pipe to prevent the flanges from separating from each other (see, for example, Patent Document 1).

JP 2010-133493 A (4th and 5th pages, FIGS. 3 and 4)

  In the flange separation preventing device described in Patent Document 1, first, a plurality of clamping members are attached at positions excluding the end portions of the divided members, and the end portions are connected to each other in a state in which both divided members are held. Is assembled. Therefore, it is necessary to hold the erection member and the clamping member by a plurality of workers when connecting the end portions of the divided members, and it is difficult to hold the erection member and the clamping member in an appropriate position.

  The present invention has been made paying attention to such problems, and it is an object of the present invention to provide a flange separation preventing device capable of mounting the erection member and the clamping member at appropriate positions of the flange with a small number of people.

In order to solve the above-mentioned problem, the flange separation preventing device of the present invention includes:
A flange separation preventing device for holding the pair of flanges against the flanges facing each other in a contact state to prevent the pair of flanges from separating,
It is composed of a plurality of divided members, and includes a erection member to which a plurality of clamping members are connected in a drop-off preventing state,
The erection member is characterized in that the split member is rotatably connected by a connecting shaft, leaving both free ends of the erection member.
According to this feature, the split member is rotated around the connecting shaft to widen both free ends of the erection member, and the erection member is wound around the pair of flanges so that the pair of flanges are sandwiched between the proper positions. Since the members are arranged, the erection member and the clamping member can be attached to the appropriate position of the flange with a small number of people.

The installation member is composed of two divided members, and a spacer portion is provided on the fluid pipe side in the vicinity of the connecting shaft that connects the divided members in a state of being attached to the pair of flanges. Yes.
According to this feature, since the connecting shaft is positioned above the fluid pipe by the spacer portion, it is possible to accurately guide the trajectory of the clamping member rotated by the dividing member toward the appropriate position.

Both free ends of the erection member are separated from each other in a state of being attached to the pair of flanges.
According to this feature, the fluid pipe and the erection member are separated from each other by the spacer portion. Therefore, when an external force is applied to both free ends of the erection member that are separated from each other in the mounting state on the flange, The wearing state can be adjusted.

A bolt member that can be screwed in the pair of flange directions is screwed to the clamping member, and the rotation of the clamping member is restricted between the erection member and the clamping member with respect to the erection member. The rotation restricting means is provided.
According to this feature, the bolt member is screwed in the flange direction, so that the effect of preventing the flanges from being separated from each other by the clamping member is enhanced, and the clamping by the reaction force when the bolt member is screwed by the rotation restricting means. The rotation of the member is restricted by the rotation restricting means, and the holding member can be fixed at an appropriate position of the pair of flanges.

At least the tip of the bolt member is made of a material having an anticorrosion function.
According to this feature, the contact portion between the bolt member and the flange can be prevented from being corroded by using the material having the anticorrosion function at the tip of the bolt member.

The clamping surface of the clamping member has a plurality of protrusions.
According to this feature, when the flange is clamped by the clamping member, the protrusion contacts the clamping surface of the clamping member, and the positional deviation of the clamping member with respect to the flange can be prevented.

It is a front view which shows the aspect with which the flange separation prevention apparatus in Example 1 was attached. It is a side view like FIG. It is a perspective view which shows the shape of the clamping member in Example 1. FIG. It is a disassembled perspective view which shows the structure of the construction member in Example 1. FIG. (A) is a top view which shows the state which a division member can rotate, (b) is a top view which shows the state which a division member cannot rotate. It is an exploded view which shows the aspect which connects a clamping member to the division member in Example 1. FIG. (A)-(c) is a side view which shows the attachment procedure to the flange of the flange separation prevention apparatus in Example 1. FIG. It is AA sectional drawing of FIG. It is a disassembled perspective view which shows the modification of a division member. (A) is a perspective view which shows the modification 1 of the protrusion of a clamping member, (b) is a perspective view which shows the modification 2 of the protrusion of a clamping member. (A) is an exploded view which shows the modification of a bolt member, (b) is front sectional drawing which shows the state which pressed the flange with the bolt member of (a). (A) is a perspective view which shows the clamping member in Example 2, (b) is front sectional drawing which shows the state of the attachment start of the clamping member with respect to a flange, (c) is clamped with respect to a flange. It is front sectional drawing which shows the state which attached the member. (A)-(c) is a side view which shows the attachment procedure to the flange of the flange separation | spacing prevention apparatus in Example 2. 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. Hereinafter, the front side of the screen in FIG. 1 will be described as the front side of the flange separation preventing device.

  As shown in FIG. 1, the fluid pipes 2 and 2 ′ of this embodiment are made of, for example, ductile cast iron for waterworks buried in the ground, and are formed in a substantially circular shape in cross section, and the inner peripheral surface is a powder. Covered with body coating or mortar layer. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or may be made of resin such as vinyl chloride. 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. Further, in this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water, for example, industrial water, agricultural water, sewage, etc., gas, gas and liquid The gas-liquid mixture may be used.

  As shown in FIGS. 1 and 2, the fluid pipes 2 and 2 ′ are connected via a valve device 6 that opens and closes the flow path of the fluid pipes 2 and 2 ′. Specifically, the flange F1 of the fluid pipe 2 and the flange F2 of the valve device 6 are joined by a plurality of bolts 8 and nuts 9, and the flange F1 ′ of the fluid pipe 2 ′ and the flange F2 ′ of the valve device 6 ′ are similarly connected. It is joined by a plurality of bolts 8 and nuts 9.

  A pair of flanges F1 and F2 and flanges F1 ′ and F2 ′ joined to each other are provided with flange separation prevention devices 1 and 1 ′. The flange separation prevention devices 1 and 1 ′ provide flanges F1 and F2 and flanges F1. “, F2” is prevented from being separated by an unexpected external force such as an earthquake. Since the flange separation preventing devices 1 and 1 ′ have the same configuration, only the flange separation preventing device 1 will be described below.

  The flange separation preventing device 1 will be specifically described. As shown in FIGS. 1 and 2, the flange separation preventing device 1 is disposed between the bolts 8 and 8 adjacent to each other in the circumferential direction of the flanges F1 and F2. A plurality of clamping members 3, 3,..., A construction member 4 to which the plurality of clamping members 3 are connected, and one side wall 3b of the clamping member 3 described later are screwed in the directions of the flanges F1, F2. It is mainly composed of bolt members 5, 5,.

  As shown in FIG. 3, the clamping member 3 includes a bottom wall portion 3a having an inner bottom surface 3d facing the outer peripheral surfaces of the pair of flanges F1 and F2, and side walls facing both sides of the bottom wall portion 3a in the tube axis direction. Part 3b, 3c, and has a substantially U-shape.

  The side wall portion 3b is formed with a screw insertion hole 3e that can be screwed with the bolt member 5, and a convex portion 3f that protrudes outward. The side wall 3c is provided with a clamping surface 3g for clamping the pair of flanges F1 and F2 by tightening the bolt member 5 as will be described later. This clamping surface 3g is provided with a plurality of protrusions 3h, 3h,... Provided at predetermined intervals, and these protrusions 3h, 3h,... Are diameters of the flanges F1, F2 when attached to the flanges F1, F2. Extending in the direction. In addition, this protrusion may not necessarily be provided.

  As shown in FIG. 4, the erection member 4 has two divided members 7, 7 having an arc shape, and adjacent one ends of the divided members 7, 7 are cut out from each other. The connecting portions 7a and 7a are formed with connecting holes 7b and 7b communicating with each other and spacer portions 7c and 7c protruding in the inner diameter direction. Further, the split members 7 and 7 are formed with the same number of insertion holes 7d as the clamping members 3 along the circumferential direction so as to communicate with the screw insertion holes 3e of the clamping member 3, and in the vicinity of the insertion holes 7d, Extending portions 7f each having a fitting hole 7e for fitting the convex portion 3f of the clamping member 3 so as to be immovable are provided.

  As shown in FIGS. 4 and 5, the divided members 7, 7 serve as a connecting shaft that extends coaxially with the fluid pipe 2 by overlapping the connecting portions 7 a, 7 a so that the connecting holes 7 b, 7 b communicate with each other. The connecting bolt 10 is inserted into the connecting holes 7b and 7b with play, and a spring washer 12 and a nut 11 are attached to the end of the connecting bolt 10 so that they are connected to each other. That is, the construction member 4 is opened at the portion facing the connection bolt 10 to form free ends 4a and 4a, and the split members 7 and 7 are rotated around the connection bolt 10 so that the free end 4a of the installation member 4 is free. , 4a can be opened and closed. Further, since the split members 7 and 7 are connected by overlapping the cut-out connecting portions 7a and 7a, the split members 7 and 7 are substantially flush with each other in the circumferential direction and are attached to the split members 7 and 7. The members 3, 3,... Can be arranged without shifting in the tube axis direction.

  As shown in FIG. 5 (a), when the connecting bolt 10 and the nut 11 are loosened, the divided members 7, 7 do not come into contact with each other, the friction is reduced, and the divided members 7, 7 are smooth. As shown in FIG. 5 (b), the divided members 7 and 7 are fixed to each other so as not to rotate by tightening the connecting bolt 10 and the nut 11.

  As shown in FIG. 6, the sandwiching members 3, 3,... Fit the protrusions 3f, 3f,... Into the fitting holes 7e, 7e,. Are screwed into the screw insertion holes 3e, 3e,... From the split member 7 side so as to be non-rotatably connected to the split member 7. That is, each convex part 3f and each fitting hole 7e function as a rotation restricting means for restricting the rotation of the sandwiching members 3, 3,. The bolt member 5 is divided by rotating the holed screw 5a with the hexagonal wrench or the like while the nut 5b is screwed onto the holey screw 5a rotated with the hexagonal wrench or the like and the nut 5b is fixed. The members 7, 7 and the clamping members 3, 3, ... are integrally connected.

  Next, a process of attaching the flange separation preventing device 1 to the flanges F1 and F2 will be described.

  As shown in FIG. 7A, the flange separation preventing device 1 configured as described above firstly loosens the connecting bolt 10 and the nut 11, and the divided members 7 and 7 are moved around the connecting bolt 10. And the free ends 4a and 4a of the erection member 4 are expanded so as to be separated from the outer diameters of the flanges F1 and F2, and are arranged above the flanges F1 and F2.

  Next, as shown in FIG. 7B, the flange separation preventing device 1 is lowered toward the flanges F1 and F2 with the free ends 4a and 4a of the erection member 4 being expanded. At this time, the flange separation preventing device 1 can be positioned in the circumferential direction of the fluid pipe 2 by first bringing the spacer portions 7 c and 7 c into contact with the upper end of the outer peripheral surface of the fluid pipe 2.

  Thereafter, as shown in FIG. 7C, the erection member 4 is closed so that the free ends 4a and 4a thereof are close to each other, and wound around the flanges F1 and F2. At this time, since the position of the connecting bolt 10 is positioned in the fluid pipe 2 by the spacer portions 7c and 7c, each clamping member 3 is positioned between the bolts 8 and 8 adjacent to each other in the circumferential direction of the flanges F1 and F2. It can be guided to draw an accurate trajectory towards Accordingly, the holding members 3 are arranged so as to sandwich the flanges F1 and F2 while preventing interference with the bolts 8.

  In this way, the split members 7 and 7 are rotated by the connecting bolt 10 to widen the free ends 4a and 4a of the erection member 4, and the erection member 4 is wound around the flanges F1 and F2, so that the flanges F1 and F2 are Since the clamping member 3 is disposed at an appropriate position so as to be sandwiched and the spacer portions 7c and 7c are positioned at the upper end of the fluid pipe 2, the center of gravity of both the divided members 7 and 7 is stabilized and supported by the fluid pipe 2 Therefore, the holding member 3 and the erection member 4 can be attached to the flanges F1 and F2 with a small number of people without requiring support.

  Further, when the erection member 4 is wound around the flanges F1 and F2, the outer peripheral surface of the fluid pipe 2 and the inner peripheral surface of the erection member 4 are always separated from each other by the spacer portions 7c and 7c. Is wound around the flanges F1 and F2, both free ends 4a and 4a of the erection member 4 are separated from each other in the circumferential direction of the flanges F1 and F2.

  According to this, even if it is a flange of a corresponding standard, a flange having a slightly smaller diameter may be formed due to an error allowed in the production process. For example, the installation member 4 is wound around the flange. Even in this case, by applying an external force to both free ends 4a and 4a of the erection member 4, both free ends 4a and 4a can move in the inner diameter direction by the height of the spacer portions 7c and 7c. The sandwiching members 3, 3... Can be arranged at appropriate positions by adjusting the mounting state such as the depth at which the sandwiching members 3, 3.

  And after tightening the connecting bolt 10 and the nut 11 as described above and making the divided members 7 and 7 unrotatable, as shown in FIG. 8, by tightening the bolt members 5, 5,. The front end surface 5c of the bolt members 5, 5,... Is advanced toward the flanges F1, F2, and the back surface F1a of the flange F1 is pressed. The clamping surfaces 3g, 3g,... Of the clamping members 3, 3,... From the opposing direction of each bolt member 5 due to the reaction force generated when the bolt members 5, 5,. The flange F2 is pressed against the back surface F2a, and the flanges F1 and F2 are clamped in the tube axis direction.

  Further, the connecting bolt 10 and the nut 11 are tightened before the bolt members 5, 5... Are tightened, and the split members 7 and 7 are made unrotatable. Therefore, it is not necessary to support the clamping members 3, 3.

  Moreover, since the convex part 3f and the fitting hole 7e are fitted as described above, when the bolt member 5 is tightened, the erection member 4 of the clamping member 3 due to the reaction force into which the bolt member 5 is screwed. Therefore, the tightening operation can be performed with a small number of people.

  In the state where the bolt member 5 is tightened, a plurality of protrusions 3h, 3h,... (See FIG. 3) provided on the clamping surface 3g of the clamping member 3 extend in the radial direction of the flanges F1, F2. Since it is disposed and comes into contact with the rear surface F2a of the flange F2, the clamping member 3 for the flanges F1, F2 is strongly clamped by the action of the bending moment acting between the contact portions of the protrusions 3h, 3h,. The positional deviation in the circumferential direction can be prevented.

  The pair of flanges may differ in the number and position of bolts that join the pair of flanges even if the flanges have the same diameter due to, for example, a difference in fluid pressure flowing in the fluid pipe. In the flange separation preventing device 1, it is possible to cope with a pair of flanges having different connection modes by winding the erection member 4 while shifting the positions of the clamping members 3, 3... In the circumferential direction of the flange. Furthermore, since the connecting bolt 10 and the nut 11 are designed to have a length that does not interfere with the bolts 8, 8,..., The connecting bolt 10 and the nut 11 are overlapped with the predetermined bolt 8 in the tube axis direction. Even if there is, it can be arranged.

  There are the following modifications of the dividing member. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted. As shown in FIG. 9, a fitting hole 7 e is provided in the vicinity of the insertion hole 7 d adjacent to the connecting bolt 10 in the divided member 71, and the insertion hole 7 d located at a substantially central portion of the divided member 71 is provided. A U-shaped hole 17e that opens in the outer diameter direction is provided in the vicinity, and is slightly larger than the protrusion 3f that loosely fits the protrusion 3f of the holding member 3 in the vicinity of the insertion hole 7d located on the free end 4a side. A diameter loose fitting hole 27e is provided.

  As described above, after the erection member 4 is wound around the flanges F1 and F2, the clamping member 3 is attached to the flanges F1 and F2 by the bolt member 5 of the clamping member 3 in which the projection 3f is fitted in the fitting hole 7e. Fix it. Thereafter, the protrusion 3 f of the clamping member 3 is loosely fitted into the loose fitting hole 27 e, and the clamping member 3 is connected to the split member 71 by the bolt member 5. And the convex part 3f is inserted from opening of the U-shaped hole 17e, and the clamping member 3 is connected with the division member 71. FIG.

  According to this, the holding member 3 in which the convex portion 3f is fitted in the loose fitting hole 27e can move the convex portion 3f in the loose fitting hole 27e, and therefore the holding member 3 can be rotated to some extent. And interference with bolts 8, 8,... That join the flanges F1, F2 and the deformed portions of the flanges (for example, the bottom shape shown in the above embodiment) can be avoided.

  Furthermore, since the U-shaped hole 17e can attach and detach the clamping member 3 from its opening, for example, when the clamping member 3 fitted into the U-shaped hole 17e interferes with the bolts 8, 8,. The clamping member 3 can be removed from the opening, and the clamping member 3 can be attached from the opening after the U-shaped hole 17e is disposed at an appropriate position.

  Further, there are the following modifications of the protrusions of the holding member. As shown in FIG. 10 (a), the plurality of protrusions 31h, 31h,... Are formed on the clamping surface 3g so as to extend in a direction perpendicular to the tube axis of the fluid pipe 2, as a modification 1 of the protrusions. Yes. According to this, when the protrusion 31h contacts the back surface F2a of the flange F2, it is possible to effectively prevent the holding member 31 from being displaced in the outer diameter direction of the flanges F1 and F2 (see FIG. 8).

  Furthermore, as a modification 2 of the ridges, as shown in FIG. 10B, the plurality of ridges 32h, 32h,... Are arranged obliquely with respect to the clamping surface 3g. According to this, when the protrusion 31h contacts the back surface F2a of the flange F2, the holding member 32 is prevented from being displaced in the circumferential direction and the outer diameter direction of the flanges F1 and F2 (see FIG. 8). In particular, when an unexpected external force is applied in the expanding direction of the erection member 4, the holding member 32 can be prevented from moving in the expansion direction of the erection member 4.

  Next, a modified example of the bolt member will be described. As shown in FIG. 11A, the bolt member 51 is provided with a recess 51b that is recessed in the axial direction from the tip surface 51c of the holed screw 51a, and the tip member 52 is fitted into the recess 51b. It is supposed to be combined. The tip member 52 is made of, for example, stainless steel having insulating properties by surface coating. Note that the tip member may be formed of rubber, resin, or the like.

  According to this, as shown in FIG. 11B, by tightening the bolt member 51, the bolt member 51 advances toward the flanges F1 and F2, and the tip member 52 presses the back surface F1a of the flange F1. To come. Therefore, since the tip member 52 comes to be located at the contact portion between the bolt member 51 and the flange F1, the contact portion of the flange F1 is exposed by the contact with the bolt member 51. Even so, the tip member 52 is anticorrosive. Note that the bolt member itself may be formed of a material having an anticorrosion function.

  Next, a flange separation preventing apparatus according to the second embodiment will be described with reference to FIGS. In addition, the description which overlaps with the same structure as the said Example is abbreviate | omitted.

  As shown in FIG. 12A, the sandwiching member 33 in the present embodiment has a side wall portion 33c formed of a separate member having higher elasticity than the bottom wall portion 33a and the side wall portion 33b. The bottom wall 33a is provided so as to incline toward the side wall 33b. Further, tapered surfaces 33d and 33e are formed at the end portions of the side wall portions 33b and 33c so as to be gradually narrowed toward the bottom wall portion 33a. The side wall portion 33c is not limited to being formed as a separate member from the bottom wall portion 33a and the side wall portion 33b, and the clamping member itself may be formed of a hard material having elastic force.

  As shown in FIG. 12B, the sandwiching members 33, 33,... Are fixed so that the outer wall surface of the side wall portion 33b is not rotatable with respect to each divided member 72 of the erection member 41 described later by welding or the like. When the clamping member 33 is attached to the flanges F1 and F2, the clamping member 33 is pushed in the inner diameter direction of the flanges F1 and F2 while the tapered surfaces 33d and 33e are in contact with the outer edges of the flanges F1 and F2. The side wall portion 33c is spread in a direction opposite to the side wall portion 33b, and is attached to the flanges F1 and F2 as shown in FIG. At this time, the flanges F1 and F2 are clamped in a state of preventing separation by the elastic restoring force of the side wall 33b and the side wall 33c.

  According to this, since the flanges F1, F2 can be clamped only by the clamping members 33, 33,..., The production cost can be reduced by reducing the number of parts, and the clamping member 33 is fixed to the dividing member 72 in advance. By doing so, it is possible to reduce the number of operations and easily attach to the flanges F1 and F2.

  As shown in FIG. 13, the erection member 41 includes four division members 72, and each division member 72 is connected to each other by the connection bolt 10 so that both free ends 41 a and 41 a of the erection member 41 are left. Has been.

  As shown in FIG. 13A, the divided members 72 are rotated around the connecting bolts 10 of the erection member 41, the free ends 41a and 41a are expanded, and lowered toward the flanges F1 and F2. And as FIG.13 (b) shows, the adjacent division members 72 and 72 connected by the connection bolt 10 located in the center rotate, and it winds along flanges F1 and F2, and as mentioned above Are attached to the flanges F1, F2. Next, as shown in FIG. 13 (b), the remaining divided members 72, 72 and the clamping members 33, 33,... Are also attached to the flanges F1, F2.

  Thus, since the erection member 41 is configured by connecting a large number of divided members 72, the holding members 33 and 33 in the vicinity of the free ends 41a and 41a of the erection member 41 are large from the outside of the flanges F1 and F2. Since the winding is performed while drawing the track, it is possible to prevent interference with the bolts near the free ends 41a and 41a when the erection member 41 is wound, and it is possible to deal with various flange shapes and bolt numbers. Further, each divided member 72 and the holding member 33 can be gradually attached along the circumferential direction of the flanges F1 and F2, and the erection member 41 and the holding member 33 can be easily positioned to the large-diameter flanges F1 and F2. Can be attached to.

  In addition, after positioning one free end 41a of the erection member 41 on the flanges F1 and F2, the erection member 41 and the holding member 33 are mounted at appropriate positions by sequentially winding them along the circumferential direction of the flanges F1 and F2. Also good.

  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 connecting shaft is described as the connecting bolt 10. However, the present invention is not limited to this. For example, a hinge member is provided at the end of the divided members, and each divided member can be rotated about the axis of the hinge member. It may be.

  Moreover, the installation member is not limited to being composed of two or four divided members, and may be composed of a plurality of other divided members.

  In the present embodiment, the flange separation preventing device 1 is described as being attached to the flanges F1 and F2 of the fluid pipe 2 and the valve device 6. However, the flange separation preventing apparatus 1 is attached to a pair of flanges in which the fluid pipes are directly connected. May be.

  Also, the pinching member is not provided with a protrusion, and a member having a high friction coefficient such as rubber is provided on the pinching surface to increase the frictional force between the pinching surface and the flange and prevent the pinching member from being displaced. Good.

  In addition, the holding member 3 and the erection member 4 are supported by the fluid pipe 2 by the spacer portion 7c. For example, the spacer portion 7c is not particularly provided, and the inner bottom surface 3d of the holding member 3 is flanges F1, F2. May be supported by the fluid pipe 2.

  Moreover, the spacer part 7c is not necessarily provided for every division | segmentation member 7, What is necessary is just to be provided in the construction member at least one place.

1, 1 'Flange separation prevention device 2, 2' Fluid pipe 3 Nipping members 3b, 3c Side wall part 3e Screw insertion hole 3f Convex part (rotation restricting means)
3g Clamping surface 3h Projection 4 Construction member 4a, 4a Free end 5 Bolt member 7, 7 Dividing member 7c, 7c Spacer portion 7e Fitting hole (rotation restricting means)
8 bolt 10 connection bolt (connection shaft)
11 Nut 17e U-shaped hole (turning restricting means)
27e Free fitting hole (turning restricting means)
31 Clamping member 31h Projection 32 Clamping member 32h Projection 33 Clamping member 33b, 33c Side wall 33d, 33e Tapered surface 41 Construction member 41a, 41a Free end 51 Bolt member 52 Tip member 71 Division member 72 Division member F1, F2 Flange

Claims (6)

A flange separation preventing device for holding the pair of flanges against the flanges facing each other in a contact state to prevent the pair of flanges from separating,
It is composed of a plurality of divided members, and includes a erection member to which a plurality of clamping members are connected in a drop-off preventing state,
The flange separation preventing device, wherein the erection member is rotatably connected by a coupling shaft, leaving both free ends of the erection member.   The erection member is composed of two divided members, and a spacer portion is provided on the fluid pipe side in the vicinity of the connecting shaft that connects the divided members in a state of being attached to the pair of flanges. The flange separation preventing device according to claim 1.   The flange separation preventing device according to claim 2, wherein both free ends of the erection member are separated from each other in a state of being attached to the pair of flanges.   A bolt member that can be screwed in the pair of flange directions is screwed to the clamping member, and the rotation of the clamping member is restricted between the erection member and the clamping member with respect to the erection member. 4. The flange separation preventing device according to claim 1, further comprising a rotation restricting means that performs the rotation restriction.   The flange separation preventing device according to claim 4, wherein at least a tip of the bolt member is made of a material having an anticorrosion function.   6. The flange separation preventing device according to claim 1, wherein the clamping surface of the clamping member has a plurality of protrusions.

Images