JP2022170945A - Piping joint - Google Patents

Abstract

To provide a piping joint that is configured to constrain a telescopic part by a constraint member in normal time, and automatically releases the constraint by the constraint member in the event of a disaster such as an earthquake.SOLUTION: A restraint member 6 composed of a round bar member 6a is fixed to flanges 3, 3 on both sides of a telescopic part 2 in a region surrounding the outer peripheral part of the telescopic part 2. This fixed portion is formed by tightening nuts 6c, 6c to male screws 6b formed at each end part of the round bar member 6a with the flanges 3 sandwiched therebetween. A notch part 6d is formed in the middle part of the round bar member 6a, and the notch part 6d is broken by the action of predetermined external force for expanding and contracting the telescopic part 2, so that the restraint of the telescopic part 2 by the round bar member 6a is released.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a pipe joint such as an expansion joint, an expansion/contraction flexible tube, and a flexible tube.

As a pipe joint, for example, as disclosed in Patent Document 1, it has a bellows-type expandable part, and connecting pipes are connected to both sides of the expandable part.

In such a pipe joint, the extensible portion expands and contracts due to pipe displacement, vibration, and the like during normal times. In general, such expansion and contraction of the expansion and contraction portion is designed to have strength corresponding to such pipe displacement, vibration, etc. in normal times.

JP-A-50-127047

However, since we do not know when a disaster such as an earthquake will occur, and because fatigue damage to the telescopic part is accumulated due to the expansion and contraction of the telescopic part during normal times, there is a risk that the telescopic part will not function sufficiently in the event of a disaster such as an earthquake. .

SUMMARY OF THE INVENTION The present invention has been made in view of these points, and provides a pipe joint in which the expansion and contraction portion is restrained by a restraining member in normal times, and the restraint by the restraining member is automatically released in the event of a disaster such as an earthquake. It is intended to

The present invention is constructed as shown in (1) to (5) in order to achieve these objects.

(1) Both ends of the restraint member are fixed to both sides of the stretchable portion in the region surrounding the outer periphery of the stretchable portion, and the intermediate portion of the restraint member or both sides of the stretchable portion of the restraint member is broken or detached when a predetermined external force acts on the extensible portion in a direction to extend or contract the extensible portion.

(2) One end portion of the restraint member is slidably supported and the other end portion of the restraint member is fixed to both sides of the stretchable portion in a region surrounding the outer periphery of the stretchable portion. 1. A pipe joint characterized by fixing a stopper to the end of a member which is slidably supported, the stopper breaking or coming off when a predetermined external force acts on the extensible portion in the direction of elongating the extensible portion.

(3) Both end portions of the restraint member are slidably supported at both sides of the stretchable portion in areas surrounding the outer periphery of the stretchable portion. A pipe joint characterized by fixing a stopper that is damaged or detached due to the action of a predetermined external force in the direction of extension of the pipe joint.

(4) One end side portion of the restraint member is slidably supported and the other end portion of the restraint member is fixed on both sides of the stretchable portion in a region surrounding the outer periphery of the stretchable portion. A stopper is fixed to the end portion of the slidably supported side of the member, and the stopper is broken or separated when a predetermined external force acts on the elastic portion in a direction to extend it. A piping joint characterized by fixing a stopper that breaks or separates when a predetermined external force acts on the part in a direction of shrinking the part.

(5) Both end portions of the restraining member are slidably supported on both sides of the stretchable portion in areas surrounding the outer periphery of the stretchable portion. A stopper that is damaged or released when a predetermined external force acts in the direction of extending the restraint member is fixed, and the intermediate portion of the restraining member is damaged or released when a predetermined external force acts on the stretchable portion in the direction of contracting it. A pipe joint characterized in that two stoppers are fixed with a predetermined interval therebetween.

In preferred embodiments of the pipe joint of the present invention described in (1) to (5), the restraining member is composed of a rigid member, and in the preferred embodiment of the pipe joint of the present invention described in (1), In some cases, the restraining member is composed of a flexible member.

In the pipe joint of the present invention, the expandable portion is restrained by the restraint member in normal times, and the restraint of the stretchable portion by the restraint member is automatically released in the event of a disaster such as an earthquake in which a predetermined external force is generated. That is, when a predetermined external force acts on the extensible portion to extend it, or when a predetermined external force acts on the extensible portion to contract it, the fixing portion of the restraining member at both end positions or one end position of the extensible portion, the restraining member The notch or the stopper fixed to the restraint member is broken or separated, and the restraint of the expandable portion by the restraint member is automatically released.

FIG. 1 is a side view showing an example of a pipe joint according to the present invention. FIG. 2 is a sectional view along line II-II in FIG. 1 of FIG. FIG. 3 is a side view showing a state in which a predetermined external force acts on the pipe joint. FIG. 4 is a side view showing a modification of the pipe joint according to the present invention. FIG. 5 is a side view showing another modification of the pipe joint according to the present invention. FIG. 6 is a side view showing still another modification of the pipe joint according to the present invention. FIG. 7 is a side view showing still another modification of the pipe joint according to the present invention. FIG. 8 is a side view showing still another modification of the pipe joint according to the present invention. FIG. 9 is a side view showing still another modification of the pipe joint according to the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated concretely based on drawing.

FIG. 1 is a side view showing an example of a pipe joint according to the present invention, FIG. 2 is a cross-sectional view along line II-II of FIG. 1, and FIG. 3 shows a state in which a predetermined external force acts on the pipe joint. is a side view showing.

As shown in FIG. 1, the pipe joint 1 has a pair of flanges 3, 3 attached to both sides of an expandable portion 2. As shown in FIG. The expansion/contraction part 2 is of a bellows type and can be expanded/contracted in the axial direction. A connection pipe 4 is connected to each end of the pipe joint 1 by means of bolts, nuts, welding, or the like. In this example, as shown in FIGS. 1 to 3, by fastening the flange 3 of the pipe joint 1 to the flange 7 formed at the end of the connecting pipe 4 with a plurality of bolts and nuts 5, each end of the pipe joint 1 is It is connected to the connecting pipe 4 at the part.

Thus, in the pipe joint 1, a predetermined external force in the direction of extending or contracting the expandable portion 2 acts on both sides of the expandable portion 2 in the region surrounding the outer peripheral portion of the expandable portion 2. A restraining member 6 is attached which is broken by pressing. Here, the predetermined external force is an external force that acts in the event of a disaster such as an earthquake, and is determined by the number of restraining members 6, the strength of notch portions 6d of round bar bodies 6a, which will be described later, and the like. In the following description, the predetermined external force in the direction of extending the expandable portion 2 is referred to as "predetermined tensile force F1m", and the predetermined external force in the direction of contracting the expandable section 2 is referred to as "predetermined pressing force F2m".

As shown in FIG. 1, the restraining member 6 is composed of a rigid or flexible member fixed to both sides of the extensible portion 2. As shown in FIG. In this example, it is composed of a round bar 6a, which is a rigid member, and both ends of the round bar 6a are fixed to both sides of the extensible portion 2 by bolts and nuts. That is, male threads 6b, 6b are formed at both ends of the round rod body 6a, and each male thread 6b is inserted into the flange 3 of the pipe joint 1. Nuts arranged on both sides of the flange 3 are attached to the male threads 6b. By screwing and tightening 6c, 6c, the expansion/contraction part 2 is restrained in the most contracted state or other states (in FIG. 1, the expansion/contraction part 2 is restrained in the minimum contraction state). In addition, the round rod bodies 6a are equally divided into three portions of the flange 3. As shown in FIG.

The round bar 6a has a notch 6d formed in its middle portion, and the notch 6d is narrowed. As shown in FIG. is broken by the application of a predetermined tensile force F1m and a predetermined pressing force F2m in the opposite direction. That is, the notch 6d is applied to the extensible portion 2 of the pipe joint 1 under normal external force due to pipe displacement, vibration, etc. When an external force displacing it in the contraction direction is referred to as a "normal pressing force F2"), the axial length of the round bar 6a does not change, and the expandable portion 2 restrained by the round bar 6a does not change. When a predetermined tensile force F1m or a predetermined pressing force F2m is applied to the telescopic part 2 due to an earthquake or the like, the round bar 6a is broken (broken) from the notch 6d, and the telescopic part 2 is automatically released from the restraint of the round bar 6a. removed.

Therefore, according to the restraining member 6 configured as described above, when a piping work such as connecting the connecting pipes 4, 4 to the pipe joint 1 and burying them in the ground is performed, the normal tensile force F1 or the normal pushing force is applied. When the pressure F2 acts, regardless of the magnitude and direction of the force, the expandable portion 2 is held in a restrained state as shown in FIG. However, when a predetermined tensile force F1m is applied to the pipe joint 1 in the extension direction of the expandable portion 2 due to an earthquake or the like, as shown in FIG. However, the notch 6d of the rod 6a is also broken when the predetermined pressing force F2m acts in the contraction direction of the expandable portion 2). When the round bar 6a is damaged in this manner, the expansion/contraction section 2 is released from the restraint by the round bar 6a, and the expansion/contraction section 2 changes in the extension direction (or contraction direction). In this state, if the damage to the piping joint 1 is severe, the parts should be replaced or repaired. Take temporary measures for the damaged parts, and then leave them as they are or reinstall them after repair. It should be noted that if the extensible portion 2 is restrained by the restraining member 6 which is a non-stretchable rigid body, regardless of the restrained state (natural state, etc.), it will not be stretched or displaced unless a predetermined tensile force F1 mm or a predetermined pressing force F2 m is applied. , the extensible portion 2 is not fatigue-damaged.

Moreover, FIG. 4 is a side view showing a modification of the pipe joint according to the present invention.

The pipe joint 1 shown in FIG. 4 has, for example, a restraining member 6 restraining the extensible portion 2 in a natural state (a state in which no load is applied). do.

As shown in FIG. 4, the wire 6e is stretched under tension between the flanges 3, 3 of the pipe joint 1, and is welded 6g, 6g to the bolts 6f, 6f screwed to the flanges 3, 3. there is One or both of the welded portions 6g, 6g that fix both ends of the wire 6e are separated by a predetermined tensile force F1m. There are three wires 6e, which are evenly distributed at three locations on the flanges 3,3.

Since the restraint member 6 is a wire 6e which is a flexible member, when the contraction direction normal pressing force F2 acts on the contraction portion 2 of the pipe joint 1, the contraction of the contraction portion 2 causes the wire 6 to slack and contract. The portion 2 is deformed in the shrinking direction. In addition, when a normal tensile force F1 in the extension direction acts on the extensible portion 2 of the pipe joint 1, if the extensible portion 2 is contracted, the extensible portion 2 is elongated in the range where the wire 6 is tense, or the wire 6 is stretched. If tensioned, the expansion/contraction part 2 will not expand/contract depending on the normal tensile force F1.

However, when a predetermined tensile force F1m acts on the stretchable portion 2 in the direction of extension, one or both of the welded portions 6g, 6g that secure the ends of the wire 6e are separated, and the stretchable portion 2 changes in the direction of extension. In this state, if the damage to the piping joint 1 is severe, the parts should be replaced or repaired. Take temporary measures for the damaged parts, and then leave them as they are or reinstall them after repair. When the restraining member 6 is composed of the wire 6e, the elastic portion 2 can be restrained in a state other than the natural state. However, as shown in FIG. By doing so, the wire 6e does not become slack when restrained, and the tension such as welding can be easily performed.

Moreover, FIG. 5 is a side view showing another modification of the pipe joint according to the present invention.

The pipe joint 1 shown in FIG. 5, for example, restrains the expandable portion 2 in a natural state by means of a restraining member 6, and the restraining member 6 is composed of a belt-like member 6h which is a flexible member.

As shown in FIG. 5, the belt-shaped member 6h is stretched between the flanges 3, 3 of the pipe joint 1, and fixed in a tensioned state by bolts 6i, 6i screwed to the flanges 3, 3 at both ends thereof. It is One or both of the bolts 6i, 6i that fix both ends of the belt-shaped member 6h are broken or separated by a predetermined tensile force F1m. In addition, the belt-shaped member 6h is equally divided into three portions of the flanges 3, 3. As shown in FIG.

The restraint member 6 is composed of a belt-shaped member 6h, which is a flexible member similar to the wire 6e. 6h is slackened, and the expansion/contraction part 2 is displaced in the contraction direction. However, when the predetermined tensile force F1m acts, one or both of the bolts 6i, 6i that fix both ends of the belt-like member 6h are broken or separated, and the expandable portion 2 changes in the expanding direction. In this state, if the damage to the piping joint 1 is severe, the parts should be replaced or repaired. Take temporary measures for the damaged parts, and then leave them as they are or reinstall them after repair. When the restraining member 6 is composed of a belt-like member 6h, the elastic portion 2 can be restrained in a state other than the natural state. However, as shown in FIG. By doing so, even if the normal tensile force F1 or the normal pressing force F2 is applied, the belt-like member 6h will not be slackened, and can be easily stretched.

Moreover, FIG. 6 is a side view showing another modification of the pipe joint according to the present invention.

The pipe joint 1 shown in FIG. 6, for example, restrains the expandable portion 2 in a natural state by means of a restraining member 6, and the restraining member 6 is composed of a round bar 6j which is a rigid member. In addition, the round rod bodies 6j are arranged equally at three locations of the flanges 3,3.

That is, as shown in FIG. 6, the round bar 6j has a male screw 6k formed at one end thereof, which is fixed to one flange 3 of the pipe joint 1 with nuts 6m, 6m, similarly to the round bar 6a. , the other end portion is slidably supported in a hole 6n formed in the other flange 3 of the pipe joint 1. As shown in FIG. A ring-shaped stopper 6o is fixed by a rivet 6p to the slide-side end of the round bar 6j. When the predetermined tensile force F1m acts on the stopper 6o, the rivet 6p collides with the other flange 3 and is broken, so that the stopper 6o separates from the rod 6j. The rivets 6p may be bolts, welding or the like.

Therefore, when a normal tensile force F1 acts on the expansion/contraction portion 2 of the pipe joint 1, the expansion/contraction portion 2 expands depending on the magnitude of the force until the stopper 6o collides with the other flange 3, and the expansion/contraction of the pipe joint 1 is caused. When the normal pressing force F2 acts on the portion 2, the expansion/contraction portion 2 is contracted according to its magnitude, and contracted up to the maximum contraction state. However, when the predetermined tensile force F1m2 acts, the stopper 6o collides with the other flange 3, the rivet 6p is broken, the stopper 6o is separated, and the elastic portion 2 is not restrained by the restraining member 6, that is, the round bar 6j. be released. In this state, if the damage to the piping joint 1 is severe, the parts should be replaced or repaired. Take temporary measures for the damaged parts, and then leave them as they are or reinstall them after repair.

Moreover, FIG. 7 is a side view showing another modification of the pipe joint according to the present invention.

The pipe joint 1 shown in FIG. 7, for example, restrains the expandable portion 2 in a natural state (a state in which no load is applied) by a restraining member 6, and the restraining member 6 is composed of a round rod 6q which is a rigid member. It is

That is, as shown in FIG. 7, the round rod body 6q is slidably held in holes 6r, 6r provided in the flanges 3, 3 of the pipe joint 1 at both end portions thereof, and is protruded outside the flanges 3, 3. Ring-shaped stoppers 6s, 6s are attached to both ends.
In this state, when a normal tensile force F1 or a normal pressing force F2 acts on the expandable portion 2, the expandable portion 2 expands and contracts according to the magnitude thereof.

Each stopper 6s is fixed to the round rod body 6q by a rivet 6t. When a predetermined tensile force F1m acts on the pipe joint 1, both stoppers 6r, 6r collide with the flanges 3, 3, and the rivets 6t, 6t are at least One side is damaged. That is, the breakage of the rivet 6t separates the stopper 6s from the round bar 6q, releasing the restraint of the expandable portion 2 by the restraint 6. As shown in FIG. In this state, if the damage to the piping joint 1 is severe, the parts should be replaced or repaired. Take temporary measures for the damaged parts, and then leave them as they are or reinstall them after repair. The rivets 6t may be bolts, welding or the like.

Moreover, FIG. 8 is a side view showing still another modification of the pipe joint according to the present invention.

The pipe joint 1 shown in FIG. 8, for example, restrains the expandable portion 2 in a natural state (a state in which no load is applied) by a restraining member 6, and a stopper 6u is provided in the intermediate portion of the restraining member 6 shown in FIG. It is fixed by rivets 6v. The rivet 6v is broken or detached when a predetermined pressing force F2m is applied in the direction of shrinking the expandable portion 2. As shown in FIG. The rivets 6v may be bolts, welding or the like.

The restraining member 6 shown in FIG. 8 has a stopper 6u added to a round bar 6i in addition to the stopper 6o. The rivets 6v collide with each other, the rivets 6v are broken, and the contraction direction of the expandable portion 2 is released. Also, when a predetermined tensile force F1m acts on the telescopic portion 2, the stopper 6o provided at the end of the round bar 6i is released by the flange 3 and the telescopic portion 2 is extended, as in the case shown in FIG. Direction constraint is released. That is, the constraint on the expandable portion 2 is released when either the predetermined tensile force F1m or the predetermined pressing force F2m is applied. In this state, if the damage to the piping joint 1 is severe, the parts should be replaced or repaired. Take temporary measures for the damaged parts, and then leave them as they are or reinstall them after repair.

Moreover, FIG. 9 is a side view showing still another modification of the pipe joint according to the present invention.

The pipe joint 1 shown in FIG. 9 has, for example, a restraining member 6 restraining the expandable portion 2 in a natural state (a state in which no load is applied). 6x are fixed with rivets 6y and 6z at a predetermined interval. The rivets 6y and 6z are broken when a predetermined pressing force F2m acts in the direction of shrinking the expandable portion 2. As shown in FIG. The rivets 6y and 6z may be bolts, welding or the like.

In the restraint member 6 shown in FIG. 9, when a predetermined pressing force F2m is applied to the expandable portion 2, the stoppers 6w and 6x collide with the flanges 3 and 3 of the pipe joint 1 to break the rivets 6y and 6z, thereby breaking the expandable portion. 2 is released. Also, when a predetermined tensile force F1m acts on the expandable portion 2, the stoppers 6t, 6t provided at both ends of the round bar 6q are separated by the collision of the flanges 3, 3, as in the case shown in FIG. , the restraint in the extending direction of the extendable portion 2 is released. That is, the constraint on the expandable portion 2 is released when either the predetermined tensile force F1m or the predetermined pressing force F2m is applied. In this state, if the damage to the piping joint 1 is severe, the parts should be replaced or repaired. Take temporary measures for the damaged parts, and then leave them as they are or reinstall them after repair.

It should be noted that the present invention is not limited to the above embodiments, and can be improved and changed as appropriate without departing from the basic principle of the present invention.

For example, as shown in FIG. 1 or FIGS. 6 to 8, when the restraining member 6 is composed of a rigid member, the rigid member is not limited to the round rods 6a, 6j, and 6q described above, and may be square rods or round rods. Molded pipes, rectangular pipes, plate-like bodies, or the like can be used.

Both ends of the rigid members such as the round rods 6a, 6j, 6q may be fixed to the flanges 3, 3 or both ends of the extensible portion 2 other than the flange 3 (separately provided flanges, etc.). The fixing portion may be the above-described male screw 6b and nut 6c or male screw 6k and nut 6m, as well as bolts, rivets, welding, and the like. Further, the stoppers 6o, 6s, 6u, 6w and 6x do not have to be ring-shaped, and are not fixed by the rivets 6p, 6t, 6y and 6z. Bolts, rivets, welding or the like may be used.

The notch portion 6d formed in the rigid member such as the round bar 6a is not limited to one place, and may be provided in a plurality of places. Instead of the notch 6d, it may be made of a fragile material that is weak in strength such as tensile strength and broken by a predetermined tensile force F1m.

In addition, when a part of the rigid member such as the round bar 6a is not formed of the notch 6d or a fragile material similar to this, both ends of the rigid member may be formed into flanges 3, 3 or both ends of the expandable portion 2 other than the flange 3. It may be fixed to a portion (a separately provided flange or the like), and the fixed portion may be separated by a predetermined tensile force F1m. For example, in the case where the fixed portion is formed by bolts, rivets, welding, etc. in addition to the male screw 6b and nut 6c described above, the fixed portion may be separated by a predetermined tensile force F1m.

Further, when the restraining member 6 is composed of a rigid member such as a round bar 6a, as shown in FIG. It may be performed in other states.

Moreover, as shown in FIG. 4 or FIG. 5, when the restraining member 6 is composed of a flexible member such as a wire 6e or a belt-like member 6h, it may be composed of a flexible member other than the wire 6e or the belt-like member 6h. The flexible member is configured so as to break the welded portion 6g or the bolt 6i, and is also formed with a notch portion which breaks when a predetermined tensile force F1m is applied. It may be configured as

Further, when the restraint member 6 is composed of rigid members such as round bars 6a, 6j and 6q, or flexible members such as wires 6e and belts 6h, it is optional without arranging them in three equal parts.

Although the restraining member 6 is fixed or supported on the flange 3 of the pipe joint 1, it may be fixed or supported on a member other than the flange 3, and even if a separate member is attached to the pipe joint 1, this You may make it integrally form to.

1 Piping joint 2 Expandable part 3 Flange (both sides of the expandable part)
6 restraining member 6a round bar member 6b male screw 6c nut 6e wire 6f bolt 6g welded portion 6h strip member 6i bolt 6j round bar body 6k male screw 6m nut 6n hole 6o stopper 6p rivet 6q round bar member 6r hole 6s stopper 6t rivet 6u Stopper 6v Rivet 6w Stopper 6x Stopper 6y Rivet 6z Rivet

Claims (7)

An area surrounding the outer periphery of the telescopic part, in which both ends of the restraining member are fixed to both sides of the telescopic part, and the intermediate part of the restraining member or the fixed part of the restraining member to the both sides of the telescopic part is broken or separated when a predetermined external force acts on the extensible portion in the direction of elongating or contracting the extensible portion. One end side portion of the restraint member is slidably supported and the other end of the restraint member is fixed to both sides of the stretchable portion in a region surrounding the outer periphery of the stretchable portion, and the restraint member slides. A piping joint characterized by fixing a stopper to the end portion of the freely supported side, the stopper being broken or separated when a predetermined external force acts on the extensible portion in a direction of elongating the extensible portion. Both end portions of the restraining member are slidably supported on both sides of the stretchable portion in areas surrounding the outer periphery of the stretchable portion, and are extended to the stretchable portion at both ends of the restraint member. A piping joint characterized by fixing a stopper that is damaged or detached by the action of a predetermined external force in a direction. One end side portion of the restraint member is slidably supported and the other end of the restraint member is fixed to both sides of the stretchable portion in a region surrounding the outer periphery of the stretchable portion, and the restraint member slides. A stopper is fixed to the end on the freely supported side, and is damaged or separated by the action of a predetermined external force on the stretchable portion in a direction to extend it. A piping joint characterized by fixing a stopper which is damaged or detached when a predetermined external force acts in a direction of contracting the pipe joint. Both end portions of the restraining member are slidably supported on both sides of the stretchable portion in areas surrounding the outer periphery of the stretchable portion, and are extended to the stretchable portion at both ends of the restraint member. Two stoppers are fixed that are damaged or separated by the action of a prescribed external force in a direction, and are broken or separated by the action of a prescribed external force in a direction that shrinks the extensible portion in the intermediate portion of the restraint member. A piping joint characterized in that the stoppers of are fixed at predetermined intervals. The pipe joint according to any one of claims 1 to 5, wherein the restraining member is made of a rigid member. 2. A pipe joint according to claim 1, wherein said restraining member is constructed of a flexible member.

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