JP2010043715A - Clamp for bending part in piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamp for a bending part in piping which can inexpensively and easily support the bending part in the piping and is excellent in its earthquake resistance. <P>SOLUTION: The clamp for the bending part in the piping includes two pipe clamps 9 having plate shaped clamp fittings 15 and a connecting member 20 for connecting together the clamp fittings 15 respectively provided in the pipe clamps 9. The clamp fittings 15 and the connecting member 20 can be fixed by welding or can be connected so as to be rotatable through connecting pins. As the pipe clamps 9, may be used a clamp using two clamp fittings 15 which have long strips of metal formed in semi-circular forms, or a clamp using a U-shaped rod 22 having screws formed at both ends and one long strip of clamp fitting 15 having through-holes opened through which both the ends of the U-shaped rod 22 pass. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pipe bent portion clamp that supports a bent portion of a pipe laid in various plants such as power generation, chemical, petroleum, and waste disposal.

  There are several types of piping support devices, such as hangers, vibration isolator, and restraint, which are mainly used for supporting the own weight of the piping system and when an earthquake or piping fluid vibration occurs. Classified as seismic (vibration-proof) for preventing or dampening vibrations in piping systems. A hanger is generally used for its own weight, and a vibration isolator is used for earthquake resistance. The restraint has both its own weight and earthquake resistance, and there are both frame type and rod type. A vibration isolator and a rod type restraint are rod-shaped support devices. These rod-shaped support devices are composed of a support device main body, a support frame composed of a combination of shape steels such as angle steel, H-shape steel, and square steel, and a pipe clamp or a welded lug for connection to a pipe and a housing. Is done. In the case of a vibration isolator, the rotation of the pin coupling part or the mechanism of the support device body follows a gentle movement due to its own weight or heat, and is supported for a relatively fast (short-term) movement such as an earthquake. Restrain the movement in the direction of the direction. On the other hand, in the case of rod type restraints, the movement of the supported direction against the movement of its own weight, heat, earthquake, etc., following the gentle movement other than the supporting direction by the rotation of the pin coupling part. to bound.

  Conventionally, the pipe clamp is mainly used when restraining the direction perpendicular to the axis of the pipe, and is used only for the straight pipe portion of the pipe. The pipe clamp is composed of two clamp fittings made of a semi-circular strip-shaped metal plate, and bolts and nuts that fasten both ends of the two clamp fittings combined in a circle. One or more U-shaped rods with screws formed at both ends, one clamp fitting with a through-hole penetrating both ends of the U-shaped rods, and screws on the screws. Some of them are composed of nuts to be joined (see, for example, Patent Documents 1 and 2).

  When supporting bent parts such as elbows and bent pipes, welded lugs are generally used, and three clamps are connected by an arm as a clamp for supporting from the bent part. Some have adopted a special clamp in which three plate-like half-grip rings are connected by a support plate (see, for example, Patent Documents 3 and 4).

FIG. 5 shows a support structure for piping in various plants to which the above-described conventional technology is applied. The piping of this example is laid between the tank 1 and the pump 2, and includes a straight pipe 3, an elbow 4, and a bending pipe 5. The horizontal straight pipe 3 on the tank 1 side is supported by a pipe clamp 9, a rod-shaped rod-type restraint 7, and a hardware 12 set on the ceiling of the building. It is supported by a frame-type restraint 6 made of a shape steel such as steel, H-shape steel or square steel. The vertical straight pipe 3 at the center is supported by a U-shaped pipe clamp 9, a vibration isolator 8, and a hardware 12 set on the ceiling of the building. Further, a bending pipe 4 connecting the horizontal straight pipe 3 on the tank 1 side and the vertical straight pipe 3 at the center is composed of a welded lug 11 welded to the bending pipe 4, a vibration isolator 8, and a structural beam 13. Is supported by.
Japanese Utility Model Publication No. 3-013021 Japanese Utility Model Publication No. 2-127878 Japanese Utility Model Publication No. 2-031666 Japanese Utility Model Publication No. 4-013484

  By the way, in nuclear power plants and the like, in recent years, improvement of earthquake resistance has become an increasingly important technical issue, and the existing plants are required to complete reinforcement work at an early stage. In order to reinforce the pipe, it is effective to increase the support of the bent portion. However, in the method using the welded lug 11 as in the prior art, the groove surface of the welded lug 11 has a three-dimensional shape. Therefore, in the case of a nuclear power plant that not only is difficult to weld but also has high importance of equipment and requires high reliability, it takes a lot of time for welding work and inspection, so the work must be completed in a short period of time. It is difficult to hire under certain circumstances.

  For this reason, application of a pipe clamp having excellent workability is also being considered for the pipe bending portion, as in the case of the straight pipe portion. However, since a conventional general pipe clamp is manufactured for a straight pipe part, when this is applied to a bent part of a pipe, the inner surface of the clamp metal fitting does not fit the surface of the pipe, Since the contact becomes point contact or line contact, it is difficult to obtain the necessary gripping force, and when a dynamic support point load is generated due to an earthquake or the like, the clamp is easily rotated in the circumferential direction of the pipe or displaced in the axial direction. We cannot expect support function.

  This point will be described in more detail with reference to FIGS. FIG. 6 is a plan view showing a contact state between the clamp fitting and the pipe when the straight pipe clamp is independently applied to the pipe bent part, and FIG. 7 is a clamp when a tensile load is applied to the support device body 18. 6 is a cross-sectional view taken along the line XX in FIG. 6 showing a contact state between the metal fitting and the pipe. FIG. 8 is a cross-sectional view taken along the line Y- in FIG. It is Y sectional drawing.

  As shown in these drawings, the pipe clamp 9 of this example includes two clamp fittings 15 formed by forming a strip-shaped metal plate into a semicircular shape, and these two clamp fittings wound around a pipe. 15 It is comprised from the volt | bolt 16 and the nut 17 which fasten the both ends, and is attached toward the center point O of the bending radius of the piping bending part 14. As shown in FIG. In addition, a support device body 18 including a vibration isolator and the like is pin-coupled to one end of the clamp fitting 15 via a connection pin 19.

  The support point load of the pipe generated by an earthquake or the like is a reaction force generated by restraining the movement of the pipe by the support apparatus main body 18 and is transmitted to the pipe via the support apparatus main body 18 and the pipe clamp 9. At this time, when a load in the tensile direction (tensile load T) is generated with respect to the support device main body 18, the straight pipe portion clamp 15 attached to the pipe bending portion 14 is connected to the inner surface (a line connecting points A and B). ) Is a straight line, point contact is made at four points of point A, point B, point C and point D with respect to the bending radius R1 of the pipe bending portion 14, and the load is transmitted at these point contact portions. Similarly, when a load in the compression direction (compression load C) is generated on the support device main body 18, point contact is made at the points E and F with respect to the bending radius R2 of the pipe bending part 14, and the load is applied at the contact part. Is transmitted. Therefore, when the conventional pipe clamp 9 is applied alone to the pipe bending portion 14, the contact area between the outer surface of the pipe and the inner surface of the clamp metal fitting is smaller than when applied to the straight pipe portion, and the piping by the pipe clamp 9 is reduced. The gripping force becomes lower. For this reason, it becomes easy to produce the phenomenon that the pipe clamp 9 rotates to the circumferential direction of piping, or shift | deviates to an axial direction, and cannot fully demonstrate the support function of the whole support apparatus.

  In addition, as described in Patent Documents 1, 3, 4, etc., if the pipe clamp is manufactured in accordance with the shape of the bent portion of the pipe, such inconvenience can be eliminated. Since the number of pipes to be laid is enormous and the curvature radii of pipe bends differ from one another, it is too costly and realistic to produce specially designed pipe clamps for each bend shape. is not.

  The present invention has been made in view of the actual situation of the prior art, and an object of the present invention is to provide a pipe bent portion clamp that can support a pipe bent portion inexpensively and easily and has excellent earthquake resistance. It is in.

  In order to solve the above-described problems, the present invention first includes a pipe bending portion clamp, a plurality of pipe clamps provided with plate-like clamp fittings, and clamp fittings provided in the plurality of pipe clamps. The plurality of pipe clamps are attached to the connection member so that the mounting orientation of the clamp fitting with respect to the connection member is opposite when at least attached to the pipe. Made the configuration.

  According to this configuration, since a conventional pipe clamp for a straight pipe portion provided with a plate-like clamp fitting can be applied as it is, a pipe bent portion clamp can be manufactured at low cost. Moreover, since this kind of pipe clamp for straight pipe parts can be attached to piping using a volt | bolt and a nut, the welding to piping becomes unnecessary and can attach the support member with respect to piping easily. Furthermore, since the plurality of pipe clamps are attached to the connecting member so that the mounting direction of the clamp fitting with respect to the connecting member is reversed at least when being attached to the pipe, the plurality of pipe clamps connected to each other are connected to the pipe bending portion. By adopting such an installation method, even if a tensile load is applied to the clamp fitting or a compressive load is applied, the reaction force in the direction along the central axis of the pipe The component force can be applied in the opposite direction at each contact point between the pipe clamp and the pipe. Therefore, the force acting in the opposite direction can exert a wedge effect between the pipe clamp and the pipe, and can reliably prevent the pipe clamp from rotating in the pipe circumferential direction and axially shifting. .

  Secondly, according to the present invention, in the first clamp for a bent pipe portion, the clamp fitting is fixed to the connecting member.

  According to this configuration, since the clamp fitting is fixed to the connecting member, the connection strength between the clamp fitting and the connecting member is high, and the vibration resistance of the bent portion of the pipe can be further increased.

  Thirdly, in the first clamp for pipe bending portion, the clamp fitting is rotatably coupled to the connecting member.

  According to this configuration, since the clamp fitting is rotatably connected to the connecting member, the mounting orientation of each pipe clamp with respect to the connecting member is automatically adjusted according to the bending radius of the pipe bending portion when attached to the pipe. The Therefore, it becomes possible to apply to various pipe bending parts having different bending radii.

  Fourthly, in the first pipe bending portion clamp according to the present invention, the connecting member has a supporting member connecting portion for connecting the other end of the supporting member whose one end is fixed to a required fixing portion. Made the configuration.

  According to this configuration, since the supporting member connecting portion is formed in advance in the connecting member, the connection between the connecting member and the supporting member can be facilitated, and the labor required for the earthquake-proof construction can be reduced.

  According to a fifth aspect of the present invention, in the first clamp for pipe bending portion, the pipe clamp includes two clamp fittings formed by forming a strip-shaped metal plate into a semicircular shape, and the two clamp fittings. It was made into the structure which consists of the volt | bolt and nut which fasten the both ends in the state combined in the circle.

  Since the pipe clamp of this configuration has been widely used as a pipe clamp for a straight pipe portion conventionally, it is excellent in reliability and can be implemented at low cost.

  The present invention sixthly, in the first clamp for pipe bending portion, the pipe clamp can pass through one or more U-shaped rods having screws formed at both ends, and both ends of the U-shaped rod. In this configuration, it is composed of a single strip-shaped clamp fitting with a through hole and a nut screwed onto the screw.

  The pipe clamp of this configuration is also frequently used as a pipe clamp for a straight pipe part conventionally, and is excellent in reliability and can be implemented at low cost.

  The pipe bending portion clamp of the present invention includes a plurality of pipe clamps provided with plate-like clamp fittings, and a connecting member that connects the clamp fittings provided in the plurality of pipe clamps. The clamp is configured to be attached to the connecting member so that the mounting orientation of the clamp fitting with respect to the connecting member is reversed at least when attached to the pipe. It can be applied at a low cost and can be easily attached to the piping, thereby shortening the construction period required for the seismic work. Moreover, since it has a some pipe clamp, it can support piping firmly and can prevent the rotation to the piping circumferential direction of a pipe clamp, and the shift | offset | difference to an axial direction reliably.

  Hereinafter, an embodiment of a pipe bending portion clamp according to the present invention will be described with reference to FIGS. FIG. 1 is a main part plan view showing a state of a force acting on each part of a device when a tensile load is applied between a pipe bending portion clamp and piping according to the embodiment, and FIG. 2 is a pipe bending portion according to the embodiment. The principal part top view which shows the state of the force which acts on each part of an apparatus when a compressive load acts between the clamp for piping and piping, FIG. 3 is a principal part perspective view which shows the 1st example of a pipe clamp and its support structure. FIG. 4 is a perspective view of a main part showing a second example of a pipe clamp and its support structure.

  As shown in FIGS. 1 and 2, the pipe bending portion clamp according to the embodiment includes two pipe clamps 9 provided with plate-like clamp fittings 15, and clamp fittings 15 provided for each pipe clamp 9. And a connecting member 20 for connecting the two. The two pipe clamps 9 connected to the connecting member 20 are attached to the connecting member 20 in a C shape as shown in these drawings. The clamp fitting 15 and the connecting member 20 can be fixed by welding or the like, or can be rotatably connected via a connecting pin (not shown). When the clamp fitting 15 is fixed to the connecting member 20, the clamp fitting 15 and the connecting member 20 can be firmly connected to each other, so that the vibration resistance of the bent portion of the pipe can be further improved. On the other hand, if the clamp fitting 15 and the connecting member 20 are rotatably coupled via the connecting pin, the mounting orientation of each pipe clamp 9 with respect to the connecting member 20 matches the bending radius of the pipe bending portion 14 when mounting to the pipe. Since it is automatically adjusted, it can be applied to various pipe bends having different bending radii, and its versatility can be enhanced.

  As shown in FIG. 3, the pipe clamp 9 includes two clamp fittings 15 formed by forming a strip-shaped metal plate in a semicircular shape, bolts 16 for fastening both ends of the two clamp fittings 15, and this It is also possible to use a nut 17 that is screwed onto one or more, as shown in FIG. 4, one or more (one in the example of FIG. 4) U-shaped screws with screws formed at both ends. A bar 22, a single strip-shaped clamp metal 15 having a through hole that can penetrate both ends of the U-shaped bar 22, and a nut 17 that is screwed into screws formed at both ends of the U-shaped bar 22. The thing which consists of can also be used. All of these pipe clamps 9 have been conventionally used as pipe clamps for straight pipe sections, so by using them for bent pipe sections, highly reliable seismic work can be carried out at low cost. can do.

  As shown in FIGS. 1 to 4, a clevis 21 for connecting one end of the support device body 18 is provided at the center of the connecting member 20, and the clevis 21 is connected via a connecting pin 19. One end of the support device body 18 is connected. In addition, a metal body 12 having a clevis 21 is provided on a housing such as a floor, wall, beam, foundation, or the like of a building that fixes a pipe bending portion clamp via a support device main body 18, and the clevis 21 on the housing side is provided. The other end of the support device main body 18 is coupled to the other end via the coupling pin 23. Thus, since the connecting member 20 of this example is provided with the clevis 21 for connecting one end of the support device main body 18, the connection work of the support device main body 18 can be easily performed.

  As shown in FIGS. 1 and 2, when the two pipe clamps 9 connected via the connecting member 20 are attached to the pipe bending portion 14, the two clamp fittings 15 provided in each pipe clamp 9 are: The extension of the center line is arranged so as to intersect at the center O of the bending radius of the pipe, and both sides of the straight line OG connecting the mounting position G of the support device body 18 and the center point O of the bending radius of the pipe bending portion 14 are centered. Are arranged at symmetrical positions. Further, the other end H of the support device body 18 is arranged on an extension line of the straight line OG. Thereby, the support point load (tensile load T or compressive load C) of the pipe generated by an earthquake or the like is applied to the pipe via the support device body 18, the connecting component 20, and the pipe clamp 9 by restraining the movement of the pipe. Communicated.

And when the load (tensile load T) of the tension | pulling direction with respect to the support apparatus main body 18 generate | occur | produced, as shown in FIG. It is transmitted to point I and point J that are in contact with the outer surface. Since this pipe clamp 9 is attached toward the center point O of the bending radius R of the pipe, the load T / 2 is a component I _Y , J _{Y in the} direction of the center point of the bending radius R of the pipe and its right angle. It is decomposed into components I _x and J _{x in the} direction, that is, the tangential direction of the pipe bending portion 14. The tangential components I _x and J _x attempt to rotate each pipe clamp 9 in a direction parallel to the direction of the straight line OG around the center points A _I and A _J of the joint with the connecting member 20. Therefore, even when the inner surface of the pipe clamp 9 and the outer surface of the pipe are in point contact with each other, the pipe clamp 9 is connected to the circumference of the pipe. It is possible to prevent rotation in the direction and displacement in the axial direction.

Similarly, when a load in the compression direction (compression load C) is generated with respect to the support device main body 18, half of the compression load C is piped through each pipe clamp 9 as shown in FIG. 2. Is transmitted to the K point and the M point which are in contact with the outer surface of the. The pipe clamp 9, as described above, since the mounted toward the center point O of the bending radius R of the pipe, the load C / 2, the center of the component K _Y bend radius R of the _pipe, M _Y And components K _x and M _{x in the} direction perpendicular to the tangential direction of the pipe bending portion 14. The tangential components K _x and M _x attempt to rotate each pipe clamp 9 in a direction parallel to the direction of the straight line OG around the center points A _I and A _J of the coupling portion with the connecting member 20. Therefore, even when the inner surface of the pipe clamp 9 and the outer surface of the pipe are in point contact with each other, the pipe clamp 9 is connected to the circumference of the pipe. It is possible to prevent rotation in the direction and displacement in the axial direction.

  In the above embodiment, the center O of the bending radius of the pipe and both ends G and H of the support device main body 18 are arranged in a straight line. However, it is not always necessary to arrange these in a straight line. As long as a reaction force component that causes rotation is generated, it is possible to obtain the same effect as in the above-described embodiment.

  Moreover, in the said embodiment, although the two pipe clamps 9 were connected to the connection member 20, the summary of this invention is not limited to this, The pipe clamp 9 of arbitrary numbers of three or more is connected. You can also The number of pipe clamps 9 connected to the connecting member 20 is determined in consideration of the curvature and cost of the pipe bending portion 14 to which the pipe clamp 9 is applied.

  INDUSTRIAL APPLICABILITY The present invention is used as a support device for piping laid in a plant such as power generation, chemical, oil and waste disposal.

It is a principal part top view which shows the state of the force which acts on each part of an apparatus when the tensile load acts between the clamp for piping bend parts which concerns on embodiment, and piping. It is a principal part top view which shows the state of the force which acts on each part of an apparatus when a compressive load acts between the clamp for piping bend parts and piping which concerns on embodiment. It is a principal part perspective view which shows the 1st example of a pipe clamp, and its support structure. It is a principal part perspective view which shows the 2nd example of a pipe clamp, and its support structure. It is a figure which shows the support structure of piping in the various plants which applied a prior art. It is a top view which shows the contact state of a clamp metal fitting and piping when a straight pipe part clamp is independently applied to a pipe bending part. It is XX sectional drawing of FIG. 6 which shows the contact state of a clamp metal fitting and piping when a tensile load acts with respect to the support apparatus main body 18. FIG. FIG. 7 is a YY sectional view of FIG. 6 showing a contact state between a clamp fitting and a pipe when a compressive load is applied to the support device main body 18.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tank 2 Pump 3 Straight pipe 4 Elbow 5 Bending pipe 6 Frame type restraint 7 Rod type restraint 8 Vibration isolator 9 Pipe clamp 11 Welding lug 12 Hardware 13 Beam of other structures 14 Pipe bending part 15 Clamp metal 16 bolt 17 nut 18 support device body 19 connecting pin 20 connecting member 21 clevis 22 U-shaped bar 23 connecting pin

Claims (6)

  It has a plurality of pipe clamps provided with plate-like clamp fittings, and a connecting member that connects the clamp fittings provided in the plurality of pipe clamps. A pipe bending portion clamp, wherein the clamp is attached to the connecting member so that the mounting direction of the clamp fitting with respect to the connecting member is reversed.   The said clamp metal fitting is being fixed to the said connection member, The clamp for pipe bending parts of Claim 1 characterized by the above-mentioned.   The clamp for a pipe bending part according to claim 1, wherein the clamp fitting is rotatably coupled to the connecting member.   The said connection member has a support member connection part for connecting the other end of the support member by which one end is fixed to a required fixing part, The clamp for pipe bending parts of Claim 1 characterized by the above-mentioned.   The pipe clamp includes two clamp fittings formed by forming a strip-shaped metal plate into a semicircular shape, and bolts and nuts that fasten both ends of the two clamp fittings combined in a circle. The pipe bending portion clamp according to claim 1.   The pipe clamp includes one or more U-shaped rods having screws formed at both ends, a single strip-shaped clamp fitting having a through-hole that can penetrate both ends of the U-shaped rod, The clamp for a pipe bending portion according to claim 1, comprising a nut screwed into a screw.

Images