JP2023128510A - Flange separation prevention device - Google Patents

Abstract

To provide a flange separation prevention device capable of preventing a pair of flanges from separating as the flanges deviate from a holding body.SOLUTION: A flange separation prevention device 10 which holds a pair of opposed flanges 3A, 3B to prevent the pair of flanges 3A, 3B from separating comprises: a plurality of holders 20 which have base parts 11a, and first wall parts 11b and second wall parts 11c erected on both sides of the bases parts 11a, and are arranged in circumferential directions of the pair of flanges 3A, 3B so that inner surfaces of the base parts 11a face outer peripheral surfaces of the pair of flanges 3A, 3B so as to hold the pair of flanges 3A, 3B; and an annular retainer 30 which extends circumferentially on sides of outer faces 11m of the base parts 11a of the plurality of holders 20 to hold the plurality of holders 20 while pressing them radially inward.SELECTED DRAWING: Figure 1

Description

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

Conventionally, a flange separation prevention device has a base and walls erected on both sides of the base, and is arranged in the circumferential direction of the pair of flanges so that the inner surface of the base faces the outer peripheral surface of the pair of flanges. and a rotating member capable of pressing a clamping piece disposed inside one of both walls, the clamping piece of each clamping body being pressed by the rotating member. Some fluid pipes prevent the flanges from separating from each other by sandwiching a pair of flanges in the axial direction of the fluid pipe (for example, see Patent Document 1).

Patent Registration No. 6591738 (Page 5, Figures 3-6)

However, in the flange separation prevention device described in Patent Document 1, the elastic force of the sealing member disposed between a pair of mutually opposing flanges may decrease due to aging, etc., or the rotating member may become loose, causing the clamping. If the clamping force of the pieces decreases, there is a problem in that the clamping body may fall off the flanges, making it impossible to prevent the flanges from separating from each other.

The present invention has been made with attention to such problems, and an object of the present invention is to provide a flange separation prevention device that can prevent flanges from separating from each other due to deviation of a clamping body from a pair of flanges. .

In order to solve the above problems, the flange separation prevention device of the present invention has the following features:
A flange separation prevention device that clamps a pair of opposing flanges to prevent the pair of flanges from separating,
It has a base and walls erected on both sides of the base, and is arranged in the circumferential direction of the pair of flanges such that the inner surface of the base faces the outer peripheral surface of the pair of flanges, a plurality of clamping bodies,
an annular holding body that extends circumferentially around the outer surface of the base of the plurality of holding bodies and holds the plurality of holding bodies so as to press the plurality of holding bodies radially inward;
It is characterized by having the following.
According to this feature, the annular holding body is circumferentially spanned around the outer surface side of the base of the plurality of holding bodies, and each holding body is pressed radially inward, so that the circumference of the holding body is By simply maintaining the length in the direction, it is possible to prevent the holding body from deviating from the pair of flanges and separating the flanges from each other.

The outer surface of the base is characterized by having a tube axial sliding portion for sliding the holder in the tube axis direction.
According to this feature, the holding body can be slid in the tube axis direction by simply loosening the force pressing the holding body radially inward, making it easy to adjust the mounting position of the holding body in the tube axis direction. can be done.

The outer surface of the base portion is characterized by having a circumferential sliding portion for sliding the holding body in the circumferential direction.
According to this feature, the holding body can be slid in the circumferential direction by simply loosening the force pressing the holding body radially inward, making it easy to adjust the mounting position of the holding body in the circumferential direction. be able to. Moreover, since the holding body becomes easier to slide in the circumferential direction, tightening becomes easier.

The inner surface of the holder is characterized in that it is formed flat in the tube axis direction.
This feature makes it difficult to damage the outer surface of the holding body when tightening the holding body.

The holding body is characterized in that it is made of a band-like member having a predetermined width in the tube axis direction.
According to this feature, the outer surface of the clamping body is evenly pressed in the tube axis direction by the band-shaped member, so that the radially inward pressing force by the holding body is applied biased to one wall side, thereby clamping the clamping body. Prevents the body from falling off.

The plurality of holding bodies are characterized in that the base portions have the same radial dimension.
According to this feature, since the diameter dimension from the tube axis to the outer surface of the base of each clamping body is all the same, it is possible to press each clamping body radially inward with equal force by the holding body.

The holding body is characterized in that it spans the outer surface of the base in the circumferential direction at a position where the gap formed between the opposing surfaces of the pair of flanges opens outward.
According to this feature, by placing the holding body at a position away from the gap, the parts other than the holding body are opened outward, so the holding body enters the gap and pushes the gap wider. This prevents the holding body from becoming a hindrance when storing or checking gaps.

The holding body is characterized in that it is disposed at a position spaced apart in at least one of the radial direction and the tube axis direction with respect to the gap formed between the opposing surfaces of the pair of flanges.
According to this feature, by arranging the holding body at a position away from the gap in at least one of the radial direction and the tube axis direction, the parts other than the holding body are opened outward. It is possible to prevent the holding body pressed inward in the radial direction from entering the gap and forcing the gap to widen, and preventing the holding body from getting in the way when visually checking the gap.

(a) is a front view showing the flange separation prevention device according to Example 1, and (b) is a sectional view taken along line AA in (a). (a) is a BB end view of FIG. 1, and (b) is a CC end view of FIG. It is a 3-sided view which shows a clamping body. (a) is a front view showing the holding body, and (b) is a sectional view taken along line DD in (a). (a), (b) is a figure which shows a spacer member, (c), (d) is a figure which shows the usage state of a spacer member. (a), (b) is a figure which shows the installation situation of the flange separation prevention device. (a), (b) is a figure which shows the installation situation of the flange separation prevention device. (a) is a diagram showing a state in which the flange separation prevention device is attached to the flange joint part, and (b) is an enlarged partial sectional view of the main part of (a). (a) is a view showing a state in which the flange separation prevention device is attached to the flange joint, and (b) is a perspective view. (a) and (b) are enlarged sectional views of main parts of a torque management type flange joint. (a) and (b) are enlarged sectional views of main parts of a flange joint portion of a flange separation prevention device for metal touch management. (a) is a view showing a holder of the flange separation prevention device according to Example 2, (b) is a front view showing the flange separation prevention device, and (c) is a sectional view taken along line EE in (b). (a), (b) is a figure which shows the installation situation of the flange separation prevention device. (a), (b) is a figure which shows the installation situation of the flange separation prevention device. (a) is a front view showing a flange separation prevention device according to modification 1, and (b) is a cross-sectional view taken along line FF in (a). 16 is a diagram showing the main part of FIG. 15. FIG. (a) to (e) are diagrams showing modification example 2 of the present invention. (a) to (c) are diagrams showing modification example 3 of the present invention.

EMBODIMENT OF THE INVENTION The form for implementing the flange separation prevention apparatus based on this invention is demonstrated based on an Example. In the following description, the front side of the paper in FIG. 1(a) will be described as the front side of the flange separation prevention device.

As shown in FIGS. 1 and 2, at one end of each of the existing fluid pipes 1A and 1B that transport fluid from the upstream side to the downstream side, annular flanges 3A and 3B for connecting each are provided in the radial direction. Bolts are inserted into a plurality of connection holes 3c formed in the circumferential direction of these opposing flanges 3A and 3B and facing in the tube axis direction, and nuts are attached to each of these bolts and nuts 7. By tightening and fixing, the flanges 3A and 3B are connected to each other. In this embodiment, the fluid in the fluid pipes 1A and 1B is clean water, but it is not limited to clean water; for example, in addition to liquids such as industrial water, agricultural water, and sewage, gases and gases and gases and liquids can also be used. It may be a liquid mixture.

The fluid pipes 1A and 1B are made of ductile cast iron, have a substantially cylindrical shape in cross section, and have inner circumferential surfaces covered with an epoxy resin layer (not shown). The fluid pipe according to the present invention may be made of other metals such as cast iron or steel, concrete, vinyl chloride, polyethylene, polyolefin, or the like. Furthermore, the inner circumferential surface of the fluid tube is not limited to the epoxy resin layer, and may be coated with, for example, mortar, or the inner circumferential surface of the fluid tube may be coated with a suitable material by powder coating.

As shown in FIG. 2(a), in the flange joint part 3 composed of flanges 3A, 3B and bolts and nuts 7 that connect the flanges 3A, 3B in the tube axis direction, the flanges 3A, 3B are The opposing surfaces are composed of inner opposing surfaces 4A, 4B and outer opposing surfaces 5A, 5B that are arranged radially outward than the inner opposing surfaces 4A, 4B, and the inner opposing surfaces 4A, 4B are outer opposing surfaces. It protrudes more toward the tube axis direction than 5A and 5B. An annular groove 6 centered around the tube axis is formed on the inner facing surface 4B, and an elastically deformable annular seal member 8 (also called GF type gasket No. 2) is provided in the groove 6. is inserted. Since a portion of the sealing member 8 bulges out from the inner facing surface 4B, the bolt/nut 7 must be tightened so that the inner facing surface 4A and the inner facing surface 4B are close to each other in the tube axis direction with the sealing member 8 in between. Then, the seal member 8 is crushed and brought into close contact with the inner facing surface 4A and the inner facing surface 4B, and the flanges 3A and 3B are connected in a sealed manner.

When the flanges 3A and 3B are connected in a sealed manner, a gap S1 is formed between the inner facing surface 4A and the inner facing surface 4B, and a gap S1 is formed between the outer facing surface 5A and the outer facing surface 5B. A gap S2 is formed. The distance L1 between the inner facing surface 4A and the inner facing surface 4B is smaller than the distance L2 between the outer facing surface 5A and the outer facing surface 5B (L1<L2).

That is, the flange joint portion 3 of this embodiment is connected such that a gap S1 is formed between the inner facing surface 4A and the inner facing surface 4B, and the distance L1 between the inner facing surface 4A and the inner facing surface 4B is Gap management that manages the sealed state by tightening and fixing with bolts and nuts 7 using spacer members 40, etc., which will be described later, so that the gaps are maintained at standard intervals (for example, a lower limit of 3.5 mm, an upper limit of 4.5 mm, etc.) It is said to be a type of joint. In this embodiment, since the nominal diameters of the flanges 3A and 3B are 75 to 900 mm, a lower limit of 3.5 mm and an upper limit of 4.5 mm are applied as the standard spacing of the separation dimension L1. , 3B has a nominal diameter of 1000 to 1500 mm, the standard spacing is a lower limit of 4.5 mm and an upper limit of 6.0 mm, and when the nominal diameter of flanges 3A and 3B is 1600 to 2400 mm, the standard spacing is a lower limit of 6.0 mm and an upper limit of 8. 0mm, and when the nominal diameter of flanges 3A and 3B is 2600mm, the standard interval is lower limit 7.5mm and upper limit 9.5mm, and the lower and upper limit values of the standard interval differ depending on the nominal diameter of the flanges. It's okay.

(Flange separation prevention device 10)
In addition, as shown in FIGS. 1 and 2, the fluid pipes 1A and 1B are exposed pipes or are part of a pipe network that is buried underground, and the flanges may be damaged due to external forces such as earthquakes or changes over time. The sealing performance may deteriorate due to separation between 3A and 3B or deterioration of the seal member 8. Therefore, in order to prevent the sealing performance between the flanges 3A and 3B from deteriorating, a flange separation prevention device 10 is provided on the flanges 3A and 3B. As shown in FIGS. 1 to 4, the flange separation prevention device 10 has a base 11a, which will be described later, and a first wall 11b and a second wall 11c standing on both sides of the base 11a. A plurality of clamping bodies 20 are disposed in the circumferential direction of the pair of flanges 3A, 3B so that the inner surface 11d thereof faces the outer peripheral surfaces of the pair of flanges 3A, 3B, and a plurality of clamping bodies 20 sandwiching the pair of flanges 3A, 3B; The holding body 30 is provided with an annular holding body 30 that extends circumferentially around the outer surface side of the base portion 11a of the holding bodies 20 and holds the plurality of holding bodies 20 so as to press the plurality of holding bodies 20 inward in the radial direction.

(Holding body 20)
Next, the holding body 20 will be explained based on FIGS. 1 to 3. As shown in FIGS. 1 to 3, the holding body 20 is attached between circumferentially adjacent bolts and nuts 7, 7 at a pair of flanges 3A, 3B. Each clamping body 20 mainly includes a clamping member 11, a clamping piece 12 as a direction changing member, a rotating member 14, a forward/backward movement member 15, and a locking portion 16 as a forward/backward movement regulating means.

As shown in FIGS. 2(b) and 3, the holding member 11 includes a base portion 11a having an inner surface 11d facing the outer peripheral surfaces of the pair of flanges 3A and 3B, and a base portion 11a that is erected at both ends of the base portion 11a. It is a substantially U-shaped member when viewed from the side, and includes a first wall portion 11b and a second wall portion 11c. One end side of the base 11a and the first wall portion 11b are connected to a rotating member 14, which will be described later, and a moving member 15 that moves forward and backward due to the rotation of the rotating member 14, and generates displacement in a direction different from the moving direction of the moving member 15. It has a clamping piece 12 as a direction changing member. A flange pressing surface 11f that is continuous with the inner surface 11d and presses the end surface of the flange in the tube axis direction is formed on the inner wall of the second wall portion 11c.

Furthermore, an outer surface 11m and a raised portion 11n that protrudes outward in the radial direction with respect to the outer surface 11m are formed on the outer surface side of the base portion 11a. The raised portion 11n is formed on the first wall portion 11b side of the base portion 11a. The outer surface 11m is formed of a rectangular flat surface with edges 11r, 11r facing in the tube axis direction and edges 11s, 11t facing in the circumferential direction, and the edges 11r, 11r have edges 11r, 11r facing inward in the radial direction. An inclined surface 11p that slopes is formed adjacent to the edge 11s, an inclined surface 11q that slopes radially inward is formed adjacent to the edge 11s, and an inclined surface 11q that slopes radially outward is formed on the edge 11t. 11u are formed adjacent to each other. Further, the length L5 of the outer surface 11m (edges 11r, 11r) in the tube axis direction is longer than the predetermined width L4 of the dividing member 31 (L5>L4).

The clamping piece 12 as a direction changing member includes a flange pressing surface 12a that presses the end surface of the flange in the tube axis direction, an inclined pressure receiving surface 12b that is inclined with respect to the advancing and retreating direction of the advancing and retreating member 15, and a wall formed on the first wall portion 11b. It is a substantially trapezoidal member in side view and has an abutting inclined surface 12e that abuts on the inclined surface 11e.

The clamping piece 12 is held on the first wall part 11b by the repulsive force of an elastic body 17 provided between a groove 12f formed in the clamping piece 12 and a groove 11k formed on the inner surface of the clamping member 11. has been done. By holding the clamping piece 12 by the elastic body 17 in this way, even when bending force is applied to the clamping piece 12, the elastic body 17 deforms and the clamping piece 12 follows, so the flanges 3A, Damage to the flanges 3A and 3B can be prevented without applying excessive force to 3B.

The rotating member 14 is composed of a bolt having a male threaded portion 14a, a locking recess 14b, and a rotating member head 14c. Further, the reciprocating member 15 is a cylindrical member having a female threaded portion 15a on the inner circumferential surface, and the holding member 11 The hole 11j is inserted into the hole 11j formed in the hole 11j.

The holding member 11 is provided with a locking portion 16 as a forward/backward movement regulating means for restricting forward/backward movement in the axial direction due to rotation of the rotating member 14 around the axis, and is locked in a locking recess 14b of the rotating member 14. This restricts the forward and backward movement of the rotating member 14. By providing the locking portion 16 as a forward/backward movement regulating means, the rotating member 14 does not move forward or backward in the axial direction even if the rotating member 14 is rotated. The movement can be efficiently transmitted to the advancing and retracting member 15, and in turn, the advancing and retracting member 15 can be efficiently advanced and retreated. The advancing/retracting member 15 is provided so as to be movable in the axial direction of the rotating member 14, and includes a co-rotation prevention mechanism (not shown) for preventing co-rotation with respect to the rotating member 14, and a co-rotation prevention mechanism (not shown) for preventing co-rotation with respect to the clamping piece 12. A co-rotation prevention mechanism (not shown) is provided.

Here, the operation of the holding body 20 will be explained. When the rotating member head 14c is rotated using a tool (not shown) or the like, the reciprocating member 15, which is screwed into the male threaded portion 14a of the rotating member 14, moves back and forth. The forward and backward movement of the rotating member 14 with respect to the clamping member 11 is restricted, and the advancing and retracting member 15 is configured not to rotate together with the rotating member 14, so that the movement of the rotating member 14 in the rotational direction is limited to , and the advancing/retracting member 15 moves back and forth efficiently. The clamping piece 12 is pressed by the inclined pressure receiving surface 12b pressed by the advancing/retracting member inclined surface 15b of the advancing/retracting member 15 and the abutment inclined surface 12e that abuts against the wall inclined surface 11e, so that the pressing direction of the advancing/retracting member 15 (in the direction of the white arrow in FIG. 2(b)) and in a direction different from that in the direction of the black arrow in FIG. Displaced to.

Further, the rotational force of the rotating member 14 is amplified by the wedge effect of the contacting inclined surface 12e that contacts the inclined pressure receiving surface 12b of the clamping piece 12 and the wall inclined surface 11e, and By strongly sandwiching the pair of flanges 3A and 3B with the flange pressing surface 11f of the member 11, it is possible to prevent the pair of flanges from separating.

(Holding body 30)
Next, the holder 30 will be explained based on FIGS. 1 and 4. As shown in FIGS. 1 and 4, the holder 30 includes a plurality of divided members 31 made of band-like metal members each having a predetermined width L4, and bolts connecting the ends of each divided member 31. and a connecting member 32 made of a nut. Each divided member 31 is formed in an arc shape, and a connecting piece 33 having an insertion hole 33a through which the connecting member 32 can be inserted is formed at the circumferential end thereof to be bent outward in the radial direction.

Each divided member 31 is provided with a through hole 34 extending in the circumferential direction and passing through in the radial direction so that a spacer member 40 (described later) can be inserted therein. Further, the circumferential length of the through hole 34 is set to correspond to a predetermined number (three in this embodiment) of bolts and nuts 7 attached in the circumferential direction of the flanges 3A, 3B.

In the divided member 31 configured in this way, a bolt inserted into the insertion hole 33a of the connecting piece 33 on one end side of one divided member 31 can be inserted into the insertion hole 33a of the connecting piece 33 on the other end side of the other divided member 31. It can be connected by inserting it into the bolt and screwing a nut onto the tip of the protruding bolt. By connecting the four divided members 31 with the connecting member 32, an annular holding body 30 having an outer diameter R2 larger than the outer diameter R1 of the flanges 3A and 3B of the fluid pipes 1A and 1B is configured. (R1<R2). That is, the outer diameter R2 is the outer diameter R1 of the flanges 3A, 3B plus twice the radial thickness L3 (see FIG. 2) of the base 11a of the clamping member 11 (R2 =R1+L3×2). Note that the thickness of the dividing member 31 is small, so it is not considered.

(Spacer member 40)
Next, the spacer member 40 will be explained based on FIG. 5. As shown in FIG. 5, the spacer member 40 is made of a metal member that extends in one direction, is formed into a wedge shape that tapers toward the tip, and is inserted into the gaps S1 and S2 formed between the flanges 3A and 3B. It is composed of an insertion section 40a and an operation section 40b arranged outside the gaps S1 and S2. Further, the operating portion 40b extends from a position shifted in the plate thickness direction with respect to the inserting portion 40a, and a crank-shaped step portion 40c is formed between the inserting portion 40a and the operating portion 40b.

The plate thickness dimension L10 of the insertion portion 40a is within the same standard interval range as the separation dimension L1 between the inner facing surface 4A and the inner facing surface 4B (L10=L1). Moreover, the length dimension L11 of the insertion part 40a is such that the insertion part 40a is inserted between the flanges 3A and 3B, and the step part 40c is in contact with the outer peripheral surface of the flange 3B, as shown in FIG. 5(c). The length is such that one end portion of the insertion portion 40a is inserted into the gap S1 between the inner facing surface 4A and the inner facing surface 4B when movement inward in the radial direction is restricted. Further, the length L12 of the operating portion 40b is larger than the radial thickness L3 of the base 11a of the holding member 11 (L12>L3).

In this way, by inserting the insertion part 40a until the stepped part 40c comes into contact with the outer peripheral surface of the flange 3B, the insertion part 40a of a predetermined length is inserted into the gap S1 between the inner facing surface 4A and the inner facing surface 4B. Therefore, the insertion work of the plurality of spacer members 40 can be easily performed. Further, as shown in FIG. 5(d), the operating portion 40b can be easily removed by pulling it out using a tool such as pliers.

(Installation process of flange separation prevention device 10)
Next, the installation process of the flange separation prevention device 10 will be explained based on FIGS. 6 to 9. In the following, a process for attaching the flange separation prevention device 10 to the flange joint portion 3 [gap management] of the existing fluid pipes 1A, 1B will be described.

As shown in FIG. 6(a), first, new bolts and nuts are inserted into the connecting holes 3c (see FIG. 2(a)) formed in the circumferential direction of the flanges 3A and 3B in place of existing bolts and nuts (not shown). After installing the bolts and nuts 7, the bolts and nuts 7 are tightened and fixed so that the distance L1 between the inner facing surfaces 4A and 4B falls within the standard interval range. In addition, when installing the flange separation prevention device 10 on the flange joint part 3 of the newly installed fluid pipes 1A, 1B, install new bolts and nuts 7 in the connection holes 3c of the flanges 3A, 3B from the beginning, and set the separation dimension L1 as the standard. Tighten and fix so that the distance is within the range.

Next, as shown in FIG. 6(b), a spacer member 40 is inserted into one circumferential side of a predetermined bolt/nut 7, and clamping bodies are placed on both sides of the bolt/nut 7 and spacer member 40 in the circumferential direction. 20 and temporarily secure it to the extent that it does not fall. The temporary fixing is performed such that the flanges 3A and 3B are arranged between the first wall portion 11b and the second wall portion 11c, and the inner surface 11d of the base portion 11a is in contact with or close to the outer peripheral surface of the flanges 3A and 3B. After placing the clamping member 11, the rotating member 14 is lightly tightened and the advancing/retracting member 15 is advanced, and the flange pressing surface 12a of the clamping piece 12 and the flange pressing surface 11f of the clamping member 11 press the pair of flanges 3A, 3B. Hold it lightly.

Further, as shown in FIG. 7(a), other spacer members 40 and holding bodies 20 are arranged in the same manner. In FIG. 7(a), five bolts/nuts 7, four clamping bodies 20, and two spacer members 40 are arranged within a range of about 45 degrees, but depending on the installation conditions, The clamping body 20 and the spacer member 40 may be arranged between the plurality of bolts and nuts 7, 7, . Good too. In FIGS. 1(a) and 1(b), the flange separation prevention device 10 is installed so that all the rotating members 14 are disposed on the fluid pipe 1A side, but all the rotating members 14 are The rotating member 14 may be attached so as to be disposed on the fluid pipe 1B side, or may be attached so that the rotating member 14 is disposed on the fluid pipe 1A side and the fluid pipe 1B side.

Next, the rotating member head 14c of the rotating member 14 is rotated and tightened with a specified torque. The forward/backward member 15 moves in due to the rotation of the rotary member 14 (see the direction of the white arrow in FIG. 2(b)), and the displacement of the forward/backward member 15 is controlled by the clamping piece 12 as a direction changing member to change the forward/backward direction of the forward/backward member. Displacements are generated in different directions (see the direction of the black arrows in FIG. 2(b)), and the pair of flanges 3A and 3B are clamped between the flange pressing surface 12a of the clamping piece 12 and the flange pressing surface 11f of the clamping member 11. This prevents the pair of flanges 3A, 3B from separating.

Similarly, for the other clamping bodies 20 arranged in plurality along the circumferential direction, the pair of flanges 3A and 3B can be removed from the flange pressing surface 12a of the clamping piece 12 by sequentially tightening the rotating member 14 with the specified torque. and the flange pressing surface 11f of the holding member 11 in the circumferential direction. In order to prevent the rotating members 14 from being tightened unevenly, for example, after tightening one rotating member 14, it is preferable to tighten the rotating members 14 on the diagonal evenly little by little.

Furthermore, the rotating member 14 is rotated and tightened with a specified torque, but since the spacer member 40 is inserted into the gap S1, the distance L1 between the inner facing surface 4A and the inner facing surface 4B is It is possible to easily determine whether or not the standard interval is maintained. That is, even if excessive torque is applied, the insertion of the spacer member 40 can prevent the separation dimension L1 from becoming less than the lower limit of the standard spacing.

Next, as shown in FIG. 7(b), for example, with the two divided members 31, 31 loosely connected by the connecting member 32 to form a semicircular shape, one direction in the radial direction of the flanges 3A, 3B is formed. and the other direction. Here, as shown in FIG. 5C, the spacer member 40 has a length L12 of the operating portion 40b that is larger than a radial thickness L3 of the base 11a of the clamping member 11 (L12>L3). ), as shown in FIGS. 8(a) and 8(b), since the tip of the operating portion 40b protrudes radially outward from the outer surface 11m of the base portion 11a, the operating portions 40b of the two adjacent spacer members 40 By inserting the through hole 34 of the first dividing member 31 into each dividing member 31, each dividing member 31 is placed at an appropriate position in the tube axis direction on the outer surface 11m side of the base 11a, that is, corresponding to the gaps S1 and S2 between the flanges 3A and 3B. It can be easily placed in the desired position (see FIG. 9(a)).

Next, the ends of one semi-circular divided member 31, 31 and the other semi-circular divided member 31, 31 are connected to each other by a connecting member 32, thereby forming a circular holding body 30. . With the annular holding body 30 formed as shown in FIG. 7(b), the holding body 30 is rotated in the circumferential direction to connect the bolts and nuts 7, which are adjacent to each other in the circumferential direction. Adjust the arrangement position in the circumferential direction so that it is located between 7 and 7. Further, by sliding the holding body 30 in the tube axis direction, the arrangement position in the tube axis direction on the outer surface 11m is adjusted.

Here, while the dividing member 31 is formed in an arc shape with a predetermined curvature, the outer surface 11m is formed as a flat surface, so that the dividing member 31 has two edges 11r in the circumferential direction on the outer surface 11m. , 11r, but almost no surface contact with the outer surface 11m or the inclined surfaces 11p, 11p. Therefore, compared to the case of surface contact with the outer surface 11m, the frictional resistance is smaller, and the holder 30 can be easily rotated in the circumferential direction and the tube axis direction to adjust the installation position, improving work efficiency. .

In addition, since the internal angle between the outer surface 11m and the inclined surfaces 11p, 11p in the base 11a is 90 degrees or more (chamfered), the holder 30 can be rotated in the circumferential direction and the tube axis direction. Since the dividing member 31 is less likely to be caught on the edges 11r, 11r when the holding body 30 is rotated in the circumferential direction, the holding body 20 can be prevented from falling down in the circumferential direction.

In addition, since the edges 11r, 11r are formed linearly in the tube axis direction, it is easy to slide the dividing member 31 in the tube axis direction, making it easy to arrange the dividing member 31 on the outer surface 11m in the tube axis direction. can be adjusted to

By equally tightening the four connecting members 32 that connect the divided members 31, each clamping body 20 is held in a radially inwardly pressed state by the holding body 30. is prevented from falling off from the flanges 3A, 3B.

Finally, after each spacer member 40 is pulled out radially outward through the through hole 34, the distance L1 in the tube axis direction in the gap S1 between the flanges 3A and 3B is measured at multiple positions in the circumferential direction. Here, since the opening dimension of the through hole 34 in the tube axis direction is formed larger than the dimension of the entire spacer member 40 in the tube axis direction, the spacer member 40 can be held without interfering with the holding state by the holder 30. It can be pulled out. If it is difficult to remove the spacer member 40 using a tool such as pliers, slightly loosen at least one of the nearby bolt/nut 7 and the rotating member 14 of the clamping body 20. Just pull it out. Furthermore, if there is a part where the separation dimension L1 exceeds the upper limit of the standard interval, the spacer member 40 is inserted again and the bolt/nut 7 in the vicinity and the rotating member 14 of the clamping body 20 are connected. After tightening and adjusting at least one of them and pulling out the spacer member 40 radially outward, the separation dimension L1 is measured again. Alternatively, the distance L1 may be measured and adjusted while tightening at least one of the bolt/nut 7 and the rotating member 14 of the clamping body 20 without inserting the spacer member 40. On the other hand, if there is a part where the separation dimension L1 is less than the lower limit of the standard interval, loosen at least one of the bolts/nuts 7 and the rotating member 14 of the clamping body 20 in the vicinity, and then adjust the distance. Measure the dimension L1 again.

In this way, the measurement and adjustment are repeated, and the separation dimension L1 at multiple locations in the circumferential direction is adjusted to the standard spacing range, thereby completing the installation work of the flange separation prevention device 10. Finally, all the spacer members 40 are removed, and the flange separation prevention device 10 consisting of the clamping body 20 and the holding body 30 is attached to the flange joint portion 3 of the fluid pipes 1A and 1B.

Further, as shown in FIGS. 8 and 9, after the installation work to the flange joint portion 3 is completed, the flange separation prevention device 10 is attached to an annular holder in the circumferential direction on the outer surface 11m side of each clamping body 20. 30 is stretched across, as shown in FIG. 9(a), even if the dividing member 31 is disposed at a position corresponding to the gap S1 on the outer surface 11m of the base 11a, the through hole 34 is not formed in the dividing member 31. With this formation, the gap S1 formed between the flanges 3A and 3B can be visually confirmed from the outside of the holder 30 through the through hole 34.

Further, the dividing member 31 of the holding body 30 is arranged at a predetermined distance from the outer circumferential surfaces of the flanges 3A and 3B (for example, the radial thickness dimension L3 at the base 11a), as shown in FIG. 9(b). As shown in , the gap S1 (or S2) formed between the flanges 3A and 3B can be visually confirmed from a position shifted in the tube axis direction. Therefore, gap management can be easily performed.

Next, a flange separation prevention device 10A as a second embodiment of the present invention will be described based on FIGS. 10 to 14. In the second embodiment, the same components and parts as those in the first embodiment are given the same reference numerals, and detailed explanations thereof will be omitted.

The flange joint portion 3 in the first embodiment is connected such that a gap S1 is formed between the inner facing surface 4A and the inner facing surface 4B, and the distance L1 between the inner facing surface 4A and the inner facing surface 4B is This is a gap management type joint that manages the sealing state by tightening bolts and nuts 7 using spacer members 40 and the like so that the standard spacing range is maintained, but the present invention is not limited to this. Rather, as shown in FIG. 10, in the flange joint part 3, the inner facing surface 4A and the inner facing surface 4B are arranged opposite to each other via a plate-shaped seal member 8A (also called an RF type gasket), and the bolts and A torque management type joint that manages the sealing state by tightening the nut 7 to a specified torque and sandwiching the sealing member 8A between the inner facing surface 4A and the inner facing surface 4B, or as shown in FIG. The surface 4A and the inner facing surface 4B are arranged in contact with each other, and the bolts and nuts 7 are tightened to a specified torque to seal the inner facing surface 4A and the inner facing surface 4B through a sealing member 8B (also called GF type gasket No. 1). The flange separation prevention device of the present invention can also be applied to a metal touch management type joint where the sealing state is controlled by pressure contact.

Specifically, as shown in FIG. 12, in the torque management type or metal touch management type flange joint portion 3, there is no need to use the spacer member 40 used in Example 1, so the through hole 34 is You may use 30 A of holding bodies comprised by 31 A of division members which do not have.

(Installation process of flange separation prevention device 10A)
Next, the installation process of the flange separation prevention device 10A in Example 2 will be explained based on FIGS. 13 to 14. In the following, a process for attaching the flange separation prevention device 10A to the flange joint portion 3 [torque management/metal touch management] of the existing fluid pipes 1A, 1B will be described.

As shown in FIG. 13(a), first, existing bolts (not shown) are inserted into the connecting holes 3c (see FIGS. 10(a) and 11(a)) formed in plurality in the circumferential direction of the flanges 3A and 3B. After installing a new bolt/nut 7 in place of the nut, the bolt/nut 7 is tightened and fixed with the specified torque. In addition, when installing the flange separation prevention device 10A to the flange joint part 3 of the newly installed fluid pipes 1A, 1B, install new bolts and nuts 7 into the connection holes 3c of the flanges 3A and 3B from the beginning, and then replace the bolts and nuts 7. Tighten and secure with the specified torque.

Next, as shown in FIG. 13(b), the clamping bodies 20 are placed on both sides of the predetermined bolt/nut 7 in the circumferential direction, and temporarily secured to the extent that they do not fall. The temporary fixing is performed such that the flanges 3A and 3B are arranged between the first wall portion 11b and the second wall portion 11c, and the inner surface 11d of the base portion 11a is in contact with or close to the outer peripheral surface of the flanges 3A and 3B. After placing the clamping member 11, the rotating member 14 is lightly tightened and the advancing/retracting member 15 is advanced, and the flange pressing surface 12a of the clamping piece 12 and the flange pressing surface 11f of the clamping member 11 press the pair of flanges 3A, 3B. Hold it lightly.

Further, as shown in FIG. 14(a), other plurality of holding bodies 20 are arranged in the same manner. In addition, in FIG. 14(a), five bolts and nuts 7 and four clamping bodies 20 are arranged within an approximately 45-degree range, but depending on the installation conditions, the flanges 3A and 3B may be tightened and fixed. The holding body 20 may be placed between all the bolts and nuts 7, 7, etc., or may be placed every other number of the bolts and nuts 7. In FIGS. 1(a) and 1(b), the flange separation prevention device 10A is installed so that all the rotating members 14 are disposed on the fluid pipe 1A side, but all the rotating members 14 are The rotating member 14 may be attached so as to be disposed on the fluid pipe 1B side, or may be attached so that the rotating member 14 is disposed on the fluid pipe 1A side and the fluid pipe 1B side.

Next, the rotating member head 14c of the rotating member 14 is rotated and tightened with a specified torque. The forward/backward member 15 moves in due to the rotation of the rotary member 14 (see the direction of the white arrow in FIG. 2(b)), and the displacement of the forward/backward member 15 is controlled by the clamping piece 12 as a direction changing member to change the forward/backward direction of the forward/backward member. Displacements are generated in different directions (see the direction of the black arrows in FIG. 2(b)), and the pair of flanges 3A and 3B are clamped between the flange pressing surface 12a of the clamping piece 12 and the flange pressing surface 11f of the clamping member 11. This prevents the pair of flanges 3A, 3B from separating.

Similarly, for the other clamping bodies 20 arranged in plurality along the circumferential direction, the pair of flanges 3A and 3B can be removed from the flange pressing surface 12a of the clamping piece 12 by sequentially tightening the rotating member 14 with the specified torque. and the flange pressing surface 11f of the holding member 11 in the circumferential direction. In order to prevent the rotating members 14 from being tightened unevenly, for example, after tightening one rotating member 14, it is preferable to tighten the rotating members 14 on the diagonal evenly little by little. Furthermore, if any of the bolts/nuts 7 become loose due to tightening the clamping body 20 to the specified torque, they may be tightened again to the specified torque.

Next, as shown in FIG. 14(b), for example, with the two divided members 31A, 31A loosely connected by the connecting member 32 to form a semicircular shape, the flanges 3A, 3B are moved in one radial direction. and the other direction. Note that each divided member 31A is arranged at an appropriate position in the tube axis direction on the outer surface 11m side of the base portion 11a, that is, at a position corresponding to the gap S2 between the flanges 3A and 3B.

Next, the ends of one semi-circular divided member 31A, 31A and the other semi-circular divided member 31A, 31A are connected to each other by a connecting member 32, thereby forming a circular holding body 30A. . By equally tightening the four connecting members 32 that connect the divided members 31A, each clamping body 20 is held in a radially inwardly pressed state by the holding body 30A. is prevented from falling off from the flanges 3A, 3B.

(Modification 1)
Next, Modification 1 of the present invention will be described based on FIGS. 15 and 16. In addition, in this modification 1, the same reference numerals are given to the same configurations and parts as in the first and second embodiments, and detailed explanation thereof will be omitted.

The holder 30 in the first and second embodiments is a connecting member consisting of a plurality of divided members 31 formed in an arc shape from a band-shaped metal member, and bolts and nuts that connect the ends of each divided member 31. 32, but the present invention is not limited to this. For example, as shown in FIGS. The holder 30B may include a band member 51 that is deformably made of stainless steel, etc.) or a resin material, and a fastener 52 that can tighten both ends of the band member 51.

As described above, since the holding body 30B is composed of the band member 51 and the fastening tool 52, the annular holding body 30B can be formed without connecting the plurality of divided members 31, so that workability is improved. improves.

Further, as shown in FIG. 16, the band member 51 is deformable, so that when tightened by the tightening tool 52, the band member 51 is arranged along the flat outer surface 11m at the base 11a of each clamping member 11. As a result, the band member 51 is in surface contact with the outer surface 11m, is slightly bent at the edges 11r, 11r on both sides in the circumferential direction of the outer surface 11m, and forms a substantially straight line between the edges 11r, 11r of the clamping member 11 adjacent in the circumferential direction. By being stretched in a shape, it is possible to suitably prevent each holding member 11 from shifting in the circumferential direction after being tightened with the fastener 52.

In addition, since the inclined surfaces 11p and 11p are formed on both sides of the outer surface 11m in the circumferential direction, when adjusting the position in the circumferential direction with the band member 51 loosely stretched over each clamping body 20, it is possible to Since the band member 51 bent inwardly is guided by the inclined surfaces 11p and 11p to ride on the outer surface 11m, rotation in the circumferential direction can be easily performed.

(Modification 2)
Next, a second modification of the present invention will be described based on FIG. 17. In the second modification, the same configurations and parts as in the first embodiment and the first modification are denoted by the same reference numerals, and detailed explanations thereof will be omitted.

In the first embodiment, when the flange separation prevention device 10 is attached to the flange joint part 3 of the gap management type, the spacer member 40 is used as an example, but the above-mentioned spacer member is the only one used to define the gap S1. Instead, for example, a spacer member 50 as a modified example as shown in FIG. 17 may be used.

Specifically, as shown in FIG. 17, the spacer member 50 is formed from a strip-shaped metal member extending in one direction, and is inserted into the gaps S1 and S2 formed between the flanges 3A and 3B. It is mainly composed of an insertion part 50a whose upper end projects outward, a nut 50b fixed to the upper part of one side of the insertion part 50a, and a bolt 50c screwed into the nut 50b. The plate thickness dimension L20 of the insertion portion 50a is within the same standard interval range as the separation dimension L1 between the inner facing surface 4A and the inner facing surface 4B (L20=L1). Further, a guide plate 50d that can come into contact with the outer facing surface 5A is fixed to the upper part of the other surface of the insertion portion 50a.

As shown in FIG. 17(d), the spacer member 50 configured in this manner is inserted between the inner facing surface 4A and the inner facing surface by inserting the insertion portion 50a until the nut 50b comes into contact with the outer peripheral surface of the flange 3B. Since the insertion portion 50a of a predetermined length is inserted into the gap S1 between the spacer member 4B and the spacer member 4B, it is possible to easily insert the plurality of spacer members 50.

Further, as shown in FIG. 17(e), when removing the spacer member 50 after adjusting the distance L1 between the inner facing surface 4A and the inner facing surface 4B to the standard interval range using the clamping body 20, the bolt By rotating the bolt 50c clockwise, the tip of the bolt 50c comes into contact with the outer peripheral surface of the flange 3B, restricting the bolt 50c from moving inward in the radial direction, and the tip of the insertion portion 50a is inserted into the gap S1. By being inserted, the rotation of the nut 50b is restricted, so that the insertion portion 50a moves radially outward together with the nut 50b. Therefore, even if it is difficult to remove the spacer member 50 from the gap S1 with a tool such as pliers, it can be easily removed by simply rotating the bolt 50c clockwise.

Further, as shown in FIGS. 17(d) and (e), when using the holder 30B made of the band member 51 of Modification 1, the band member 51 is shifted in the tube axis direction from the position corresponding to the gaps S1 and S2. If the spacer member 50 is placed in the position shown in FIG. It becomes easier. Furthermore, if the band member 51 is disposed at a position shifted toward the raised portion 11n from the center position of the outer surface 11m in the tube axis direction, deviation in the tube axis direction can be prevented.

(Modification 3)
Next, a third modification of the present invention will be described based on FIG. 18. In addition, in this modified example 3, the same reference numerals are given to the same configurations and parts as in the first and second embodiments and the first and second modified examples, and detailed explanation thereof will be omitted.

In the first embodiment, when the flange separation prevention device 10 is attached to the flange joint part 3 of the gap management type, the spacer member 40 is used as an example, but the above-mentioned spacer member is the only one used to define the gap S1. Instead, for example, a spacer member 60 as a modified example shown in FIG. 18 may be used.

Unlike the spacer member 40 of the first embodiment and the spacer member 50 of the second modification, the spacer member 60 is not inserted or removed from the outside of the outer peripheral surface of the flanges 3A, 3B, but the bolt/nut 7 can be inserted through the gap S2. It may be made of an annular metal member, or may be made of a resin material or a rubber member. The thickness dimension L30 of the spacer member 60 is the same as the separation dimension L2 between the outer facing surface 5A and the outer facing surface 5B (L30=L2). In this way, by maintaining the separation dimension L2 in the gap S2 in which the bolt/nut 7 is arranged at a specific interval, it may be possible to maintain the separation dimension L1 within the standard interval range.

Note that the spacer member 60 is attached when the bolt/nut 7 is attached or replaced, and is placed in the gap S2 radially outside of the seal member 8, so it does not affect the sealing, and the flange Since it does not protrude outward beyond the outer peripheral surfaces of 3A and 3B, it is possible to leave the flange separation prevention device 10 attached to the gap S2 without removing it after it is attached.

(action/effect)
As explained above, in the flange separation prevention devices (for example, flange separation prevention devices 10, 10A) as Embodiments 1 and 2 of the present invention, the pair of opposing flanges 3A, 3B are sandwiched and A flange separation prevention device 10 that prevents flanges 3A and 3B from separating, which includes a base 11a and a first wall 11b and a second wall 11c standing on both sides of the base 11a, 11a is arranged in the circumferential direction of the pair of flanges 3A, 3B so that the inner surface thereof faces the outer circumferential surface of the pair of flanges 3A, 3B, and a plurality of clamping bodies (for example, clamping bodies) clamping the pair of flanges 3A, 3B are provided. body 20), and an annular holder (e.g., a holder) that extends circumferentially around the outer surface 11m side of the base 11a of the plurality of clamping bodies and holds the plurality of clamping bodies so as to press the plurality of clamping bodies radially inward. 30, 30A, 30B).

By doing so, the annular holding body is circumferentially spanned around the outer surface 11m of the base 11a of the plurality of clamping bodies, and each clamping body is pressed radially inward to hold the holding body. By simply maintaining the length in the circumferential direction of the body, it is possible to prevent the clamping body from deviating from the pair of flanges 3A, 3B and separating the flanges 3A, 3B from each other.

In addition, the outer surface 11m of the base 11a includes a tube axial direction sliding portion (for example, a flat outer surface 11m, an inclined surface 11p, 11p) for sliding the holding body (for example, the holding bodies 30, 30A, 30B) in the tube axis direction. , an inclined surface 11q). By doing this, the holding body can be slid in the tube axis direction by simply loosening the force that presses the holding body radially inward, making it possible to adjust the mounting position of the holding body in the tube axis direction. The holding body can be loosened and easily removed from the clamping body while remaining in an annular shape, and when reattached, the holding body can be guided so as to ride on the outer surface 11m by the inclined surface 11q.

The tube axial direction sliding portion is constituted by the flat outer surface 11m of the holding member 11, but if the outer surface 11m is formed flat at least toward the tube axis direction, It does not necessarily have to be formed on a flat surface, for example, it may be curved.

Further, the outer surface 11m of the base 11a includes a circumferential sliding portion (for example, a flat outer surface 11m, inclined surfaces 11p, 11p, inclined surfaces 11p, 11p, It has a surface 11q). By doing this, the holding body can be slid in the circumferential direction by simply loosening the force pressing the holding body radially inward, so that the mounting position of the holding body in the circumferential direction can be adjusted (for example, adjustment of the circumferential position of the connecting member 32 and the fastener 52) can be easily performed. In addition, since the holding body is easily slid in the circumferential direction, when the holding body is tightened, it becomes easy to slide against the clamping body, so that a decrease in the tightening force can be prevented.

The circumferential sliding portion is formed by the flat outer surface 11m of the holding member 11, but if the outer surface 11m is formed flat at least in the circumferential direction, It does not necessarily have to be formed on a flat surface, such as a curved surface.

Further, the inner surfaces of the holders (for example, holders 30, 30A, 30B) are formed flat in the tube axis direction. By doing this, the outer surface of the clamping body is less likely to be damaged when tightening the holding body.

Further, the holders (for example, the holders 30, 30A, 30B) are made of belt-like members having a predetermined dimension (for example, a predetermined width dimension L4) in the tube axis direction. By doing this, the outer surface 11m of the holding body is evenly pressed by the band-shaped member in the tube axis direction, so that the radially inward pressing force of the holding body is reduced between the first wall portion 11b and the second wall portion. 11c, it is possible to prevent the holding body from falling off due to being applied biased to one side.

Further, as in Example 1, the length L5 of the outer surface 11m in the tube axis direction is longer than the predetermined width L4 of the dividing member 31 of the holder 30 (L5>L4), The position of the holding body 30 can be adjusted in the tube axis direction on the outer surface 11m of the clamping body 20, and the dividing member 31 can be positioned at an appropriate position in the tube axis direction regardless of the mounting position of the clamping body 20 that clamps the flanges 3A and 3B. (For example, at a position corresponding to the gaps S1 and S2, etc.).

Further, the plurality of holding bodies (for example, the holding body 20) have the same radial dimension (for example, thickness L3) of the base portion 11a. By doing this, the radial dimensions from the tube axis to the outer surface 11m of the base 11a of each clamping body are all the same length, so each clamping body is pressed radially inward by the holder with equal force. be able to.

Further, the holding bodies (for example, holding bodies 30, 30A, 30B) are arranged at the base at a position where the gap S1 (S2) formed between the opposing surfaces of the pair of flanges 3A, 3B is opened outward. It extends in the circumferential direction on the outer surface 11m side of 11a (see FIGS. 8 and 9). By doing this, by arranging the holding body at a position away from the gap S1, the parts other than the holding body are opened outward, so that the holding body enters the gap S2 and the gap S1 This prevents the holding body from being pushed wide and becoming an obstacle when checking the gap S1.

Further, the holding bodies (for example, holding bodies 30, 30A, 30B) are arranged in at least one of the radial direction and the tube axis direction with respect to the gap S1 (S2) formed between the opposing surfaces of the pair of flanges 3A, 3B. are placed at positions spaced apart in the direction. By doing this, the holding body is disposed at a position away from the gap S1 in at least one of the radial direction and the tube axis direction, so that the parts other than the holding body are opened outward. Therefore, it is possible to prevent the holding body from entering the gap S2 and pushing the gap S1 wide, or preventing the holding body from getting in the way when checking the gap S1.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions that do not depart from the gist of the present invention are included in the present invention. It will be done.

For example, in Examples 1 and 2 and Modifications 1 to 3, the holders 30, 30A, and 30B are not removed from the flange joint portion 3 even after the installation work of the flange separation prevention device is completed; however, The present invention is not limited to this, and after the holding bodies 30, 30A, and 30B are installed so that they do not fall off when installing the plurality of holding bodies 20, and after the installation work of the flange separation prevention device is completed, the flange joint is It may be removed from section 3.

Further, in Examples 1 and 2 and Modifications 1 to 3, examples of the holder include the dividing member 31 and the connecting member 32 made of metal members, and the holder made of the band member 51 and the fastener 52. 30, 30A, and 30B are illustrated, the present invention is not limited to this, but may be constructed of a band member made of a rubber material or the like so that it can be expanded and contracted, and the connecting member 32 and the fastener. A holder may be used that can press the clamping body 20 radially inward using the elastic force of the band member without using a tightening force applying means such as 52 or the like.

In addition, in Examples 1 and 2 and Modifications 1 to 3, the holding bodies 30 and 30A are disposed at positions corresponding to the gap S1 in the outer surface 11m, so that the holding bodies 30 and 30A can be used to connect a pair of flanges using one clamping body 20. 3A and 3B can be pressed equally, but like the holder 30B, it may be arranged at a position shifted from the gap S1 in the outer surface 11m in the tube axis direction.

Further, in the first embodiment and the first to third modified examples, the spacer members 40, 50, and 60 are used when attaching the flange separation prevention device of the present invention to the gap management type flange joint portion 3, but The present invention is not limited to this, and it is not necessarily necessary to use the spacer members 40, 50, and 60. For example, the separation dimension L1 of the gap S1 may be maintained within a standard spacing range by torque management. .

Furthermore, an intervening body may be provided on the inner surface 11d of the clamping member 11, the flange pressing surface 11f, and the flange pressing surface 12a of the clamping piece 12 to protect and insulate the flanges 3A and 3B. Furthermore, an intervening body is also provided between the outer surface 11m of the clamping member 11 and the holder (30, 30A, 30B) to prevent contact between the outer surface 11m of the clamping member 11 and the holder (30, 30A, 30B). May be protected or insulated. The intervening body can be formed by adhering an insulator made of resin or rubber material, or by coating with nylon, rubber lining, plastic coating, epoxy resin powder coating, or the like.

1A, 1B Fluid pipe 3 Flange joint portion 3A, 3B Flange 10, 10A Flange separation prevention device 11 Holding member 11a Base portion 11b First wall portion (wall portion)
11c Second wall part (wall part)
11d Inner surface 11m Outer surface (tube axial sliding section, circumferential sliding section)
20 Holding bodies 30, 30A, 30B Holding body 31 Dividing member 32 Connecting members 40, 50, 60 Spacer members L1, L2 Separation dimensions S1, S2 Gap

Claims (8)

A flange separation prevention device that clamps a pair of opposing flanges to prevent the pair of flanges from separating,
It has a base and walls erected on both sides of the base, and is arranged in the circumferential direction of the pair of flanges such that the inner surface of the base faces the outer peripheral surface of the pair of flanges, a plurality of clamping bodies,
an annular holding body that extends circumferentially around the outer surface of the base of the plurality of holding bodies and holds the plurality of holding bodies so as to press the plurality of holding bodies radially inward;
A flange separation prevention device characterized by comprising: The flange separation prevention device according to claim 1, wherein the outer surface of the base has a tube axial direction sliding portion for sliding the holding body in the tube axis direction. The flange separation prevention device according to claim 1, wherein the outer surface of the base has a circumferential sliding portion for sliding the holding body in the circumferential direction. 4. The flange separation prevention device according to claim 1, wherein the inner surface of the holder is formed flat in the tube axis direction. The flange separation prevention device according to any one of claims 1 to 4, wherein the holding body is made of a band-shaped member having a predetermined dimension in the tube axis direction. The flange separation prevention device according to any one of claims 1 to 5, wherein the plurality of holding bodies have the same size in the radial direction of the base. 2. The holding body is arranged around the outer surface of the base in a circumferential direction at a position where a gap formed between opposing surfaces of the pair of flanges is opened outward. 7. The flange separation prevention device according to any one of 1 to 6. The holding body is arranged at a position spaced apart in at least one direction of a radial direction and a tube axis direction with respect to a gap formed between opposing surfaces of the pair of flanges. 7. The flange separation prevention device according to any one of 7.

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