JP6553884B2 - Piping mounting structure - Google Patents

Description

  The present invention relates to a pipe mounting structure for mounting a pipe on a support structure.

  Conventionally, a pipe support has been used to attach the pipe to the support structure. The pipe support has a role of receiving the weight of the pipe and a load such as heat and earthquake, and there are various types depending on the shape of the pipe and the support structure.

  There are basically two types of piping support, one for bare piping and one for piping with heat insulation and cold insulation (shoe type). Some pipe supports are limited in the direction of movement so as not to hinder the thermal expansion of the pipe, a stopper that restricts movement in the axial direction, a guide that restricts movement in the direction perpendicular to the axis, and a fix that restricts all movement. are categorized.

  The piping support is selected according to the piping diameter and the supporting load. When the supporting load is small with a small diameter pipe, a U-shaped bolt (U bolt) is used, and a saddle type is used with a large diameter pipe and a large load. The attachment of the piping support to the support structure may be performed by welding, but if the use of fire is restricted or removal is required, a bolted structure is adopted.

  The load that the pipe support receives is caused by the self-weight (primary load) that is the sum of the weight of the pipe, the weight of the contents, and the weight of the thermal insulation material, and the expansion and contraction of the pipe that occurs when the pipe is heated or cooled by the internal fluid. There is a thermal load (secondary load). These sums are called long-term loads because they always act on the piping. Moreover, the load which a piping support receives has a short-term load which acts primarily by an earthquake and a wind.

  In particular, earthquake loads can be divided into Level 1 ground motions assuming the Great Kanto Earthquake and Level 2 ground motions assuming huge earthquakes such as the Great Hanshin Earthquake and the Great East Japan Earthquake. Level 1 earthquake motion has a reproduction cycle of around 60 years, and elastic design is required to return completely to the original shape after the earthquake. Level 2 seismic motion requires an elasto-plastic design that does not necessarily return to its original form as long as the contents are not leaked. Level 1 seismic design is performed for ordinary facilities, while level 2 seismic design is performed for facilities with particularly high importance and high risk. Level 2 seismic design objects are required to ensure level 1 seismic performance at the same time.

  Piping and piping support are collectively called piping system. In the piping system, when the movement of the piping is restrained tightly, a large stress is generated in the piping due to a load applied to the piping at the time of an earthquake, and a large reaction force acts on the support structure. If the stress of the pipe or the reaction force of the support structure exceeds the limit, the weaker pipe or support structure is broken. Since the pipe has flexibility (flexibility) as its characteristic, the stress of the pipe and the reaction force of the support structure can be reduced by appropriately deforming the pipe. In the piping system, stress design that balances these is performed by combining various support types and constraint conditions.

JP 2012-149688 A JP, 2009-180253, A

  The piping support is required to be firmly restrained in the piping because the elastic design is required in the normal operation state and the level 1 earthquake motion. On the other hand, in the case of level 2 earthquake motion, since an elasto-plastic design is required, a design method is required which releases constraints and reduces these effects for large loads.

  In order to release the load exceeding the limit, generally place a shear pin (shear pin) somewhere in the piping system, and if the limit is exceeded, the pin breaks and releases the restraint, and the amount of welding of the piping restraint is adjusted However, there is a method in which the weld breaks when the limit is exceeded, but any method has a problem that the support function is lost once the restraint is released.

  The present invention has been made in view of these circumstances, and its object is to release piping restraints against a large load, and to provide piping attachment capable of maintaining a piping supporting function even when restraints are released. In providing the structure.

  In order to solve the above problems, a pipe mounting structure according to an aspect of the present invention is a pipe mounting structure for mounting a pipe to a support structure, a pipe support that connects the pipe and the support structure, A friction member interposed between the pipe support and a tightening member for tightening the friction material between the pipe and the pipe support, and when a load exceeding a predetermined release load acts on the pipe, the pipe support is And a tightening member that applies a tightening force to the friction material so that the pipe moves.

  Another aspect of the present invention is also a pipe mounting structure. This pipe mounting structure is a pipe mounting structure for mounting a pipe to a support structure, a pipe support connecting the pipe and the support structure, and a friction material interposed between the support structure and the pipe support. And a tightening member that clamps the friction material between the support structure and the pipe support so that the pipe support moves relative to the support structure when a load exceeding a predetermined release load is applied to the pipe. And a clamping member for applying a clamping force to the friction material.

  In the pipe mounting structure of the above aspect, the friction material may be a mesh spring.

  The predetermined release load may be set to a load acting on the pipe when level 2 earthquake motion occurs.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, etc. are also effective as an aspect of the present invention.

  According to the present invention, it is possible to provide a pipe mounting structure capable of releasing the restraint of the pipe against a large load and maintaining the support function of the pipe even when the restraint is released.

It is a front view for demonstrating the piping attachment structure concerning a 1st embodiment of the present invention. It is a side view for demonstrating the piping attachment structure which concerns on 1st Embodiment of this invention. It is a front view for demonstrating the piping attachment structure which concerns on 2nd Embodiment of this invention. It is a side view for demonstrating the piping attachment structure which concerns on 2nd Embodiment of this invention.

First Embodiment
FIG. 1 is a front view for explaining a pipe mounting structure 10 according to a first embodiment of the present invention. FIG. 2 is a side view for explaining the pipe mounting structure 10 according to the first embodiment of the present invention. The pipe attachment structure 10 is for attaching the pipe 12 to the support structure 14. In the first embodiment, the pipe 12 is a pipe having a circular cross section, and the support structure 14 is an H-shaped steel.

  The pipe mounting structure 10 according to the first embodiment includes a pipe support 16 that connects the pipe 12 and the support structure 14. The piping support 16 has a clamp 18 and a guide 20.

  The clamp 18 includes a pair of first gripping portion 21 and second gripping portion 22 that are arranged to face each other, a first tightening bolt 23 a that couples the first gripping portion 21 and the second gripping portion 22, and first tightening. A nut 23b, a second tightening bolt 24a, and a second tightening nut 24b are provided.

  The first grip portion 21 includes a semicircular curved portion 21a that is curved so as to receive the pipe 12, and flat portions 21b and 21c that extend above and below the curved portion 21a. Similarly, the 2nd holding part 22 has the semicircle-shaped curved part 22a curved so that the piping 12 could be received, and the flat parts 22b and 22c extended up and down of the curved part 22a. The first tightening bolt 23a is inserted through the flat portion 21b of the first gripping portion 21 and the flat portion 22b of the second gripping portion 22, and is screwed with the first tightening nut 23b. The second tightening bolt 24a is inserted through the flat portion 21c of the first gripping portion 21 and the flat portion 22c of the second gripping portion 22, and is screwed into the second tightening nut 24b. In a state where the pipe 12 is disposed between the curved portion 21a of the first gripping portion 21 and the curved portion 22a of the second gripping portion 22, the first tightening bolt 23a, the first tightening nut 23b, and the second tightening bolt 24a. The pipe 12 can be supported by tightening the second tightening nut 24b.

  The guide 20 includes an L-shaped first guide 25 and a second guide 26. The first guide portion 25 and the second guide portion 26 are disposed so as to sandwich the pipe 12 disposed on the upper surface 14 a of the support structure 14 from both sides. The first guide portion 25 is fixed to the upper surface 14a of the support structure 14 by two sets of bolts 27a and nuts 27b. The second guide portion 26 is fixed to the upper surface 14 a of the support structure 14 by two sets of bolts 28 a and nuts 28 b. The guide 20 restrains the movement of the pipe 12 in the direction perpendicular to the axis by sandwiching the pipe 12 from both sides by the first guide portion 25 and the second guide portion 26.

  As shown in FIG. 2, the first guide portion 25 has a recess 25 b formed by cutting out a part of the vertical side 25 a. Similarly, the second guide portion also has a recess. The first grip portion 21 is inserted into the concave portion 25 b of the first guide portion 25, and the second grip portion 22 is inserted into the concave portion of the second guide portion 26. The clamp 18 is fixed relative to the guide 20.

  In the pipe mounting structure 10 according to the first embodiment, the first friction material 30 is interposed between the pipe 12 and the curved portion 21a of the first gripping part 21, and the pipe 12 and the second gripping part 22 are connected. A second friction material 31 is interposed between the curved portion 22a. The first friction material 30 and the second friction material 31 are connected to the pipe 12 and the first tightening bolt 23a by tightening the first tightening bolt 23a, the first tightening nut 23b, the second tightening bolt 24a, and the second tightening nut 24b. It is clamped between the grip part 21 and the second grip part 22. The movement of the pipe 12 in the axial direction is restricted by the frictional force generated between the pipe 12 and the first friction material 30 and the second friction material 31.

  In the first embodiment, the first friction material 30 and the second friction material are determined by the tightening torque of the first tightening bolt 23a, the first tightening nut 23b, and the second tightening bolt 24a and the second tightening nut 24b. 31 can be tightened. By adjusting the tightening force of the first friction material 30 and the second friction material 31, the friction force of the first friction material 30 and the second friction material 31 changes, so that the release load of the pipe 12 can be changed to an arbitrary load. It can be set. That is, when the predetermined release load Lr is set, the first pipe 12 moves so as to move relative to the clamp 18 that is a part of the pipe support 16 when a load exceeding the release load Lr is applied to the pipe 12. The tightening force of the friction material 30 and the second friction material 31 is adjusted. In this case, when a load exceeding the release load Lr acts on the pipe 12, the pipe 12 slides and moves with respect to the clamp 18, but the pipe 12 is still supported by the clamp 18. That is, the support function of the piping 12 by the piping support 16 is maintained.

  In general, the piping support is required to have an elastic design in normal operating conditions and level 1 ground motions, while an elastic-plastic design is required in level 2 ground motions. Therefore, the release load Lr is set to the load acting on the pipe 12 when the level 2 earthquake motion occurs. In this case, when level 1 earthquake motion occurs, both the restraint function and the support function of the pipe 12 by the pipe support 16 are maintained. On the other hand, when level 2 seismic motion occurs, the piping support 16 is released from the restraint of the piping 12, so that a large stress is prevented from being generated in the piping 12, and leakage of contents due to damage to the piping 12 is prevented. be able to. Furthermore, since the piping 12 is supported by the piping support 16 even if the restraint of the piping 12 is released, the supporting function of the piping 12 should be maintained against a large aftershock that may occur after the level 2 earthquake motion. Can.

  Since the material used for the pipe 12 thermally expands when a temperature difference occurs, the first friction material 30 and the second friction material 31 need a certain degree of flexibility so that a large difference in friction force does not occur due to thermal expansion. Become. In order to ensure such flexibility, mesh springs are preferably used as the first friction material 30 and the second friction material 31. Since the mesh spring has a large deformability, the influence of the thermal expansion of the pipe 12 can be absorbed.

  In the first embodiment, the bolt and the nut are used as a fastening member for fastening the first friction member 30 and the second friction member 31, but the fastening member is not limited to the bolt and the nut. For example, a U-shaped fastening member that sandwiches the flat portion of the opposing gripping portion may be used.

Second Embodiment
FIG. 3 is a front view for explaining a pipe mounting structure 40 according to a second embodiment of the present invention. FIG. 4 is a side view for explaining a pipe mounting structure 40 according to a second embodiment of the present invention. The pipe attachment structure 40 according to the second embodiment is also for attaching the pipe 12 to the support structure 14. The pipe 12 is a pipe having a circular cross section, and the support structure 14 is H-shaped steel.

  The pipe mounting structure 40 according to the second embodiment includes a pipe support 41 that connects the pipe 12 and the support structure 14. The pipe support 41 has a shoe 42 for supporting the pipe 12 and a guide 43 for fixing the shoe 42 to the upper surface 14 a of the support structure 14.

  The shoe 42 is a substantially H-shaped pipe shoe. The upper surface portion 42 a of the shoe 42 is curved so as to follow the outer shape of the pipe 12. The upper surface portion 42 a is welded to the pipe 12. The lower surface portion 42 b of the shoe 42 is a flat surface and is disposed in contact with the upper surface 14 a of the support structure 14.

  The guide 43 is composed of eight L-shaped guide portions (first to eighth guide portions 51 to 58), and four sets of tightening bolts 60a and tightening nuts 60b. The first to fourth guide portions 51 to 54 are disposed above the upper surface 14 a of the support structure 14, and the fifth to eighth guide portions 55 to 58 are disposed below the upper surface 14 a of the support structure 14. Be done.

  The first guide portion 51 and the second guide portion 52 are disposed so as to sandwich the lower surface portion 42 b of the shoe 42 disposed on the upper surface 14 a of the support structure 14 from both sides. The third guide portion 53 and the fourth guide portion 54 are arranged to overlap above the first guide portion 51 and the second guide portion 52, respectively. The 1st guide part 51 has the recessed part 51a formed by notching the center part of a horizontal side part. Similarly, the second guide portion 52 also has a recess 52a. The first friction material 61 and the second friction material 62 are disposed in the recess 51 a of the first guide 51 and the recess 52 a of the second guide 52, respectively. The first friction material 61 and the second friction material 62 may be mesh springs. The first friction member 61 is interposed between the third guide portion 53 and the upper surface 14 a of the support structure 14. The second friction material 62 is interposed between the fourth guide 54 and the upper surface 14 a of the support structure 14.

  The fifth guide portion 55 and the sixth guide portion 56 are disposed below the upper surface 14 a of the support structure 14 with the support structure 14 interposed therebetween. The seventh guide portion 57 and the eighth guide portion 58 are disposed on the inner side of the fifth guide portion 55 and the sixth guide portion 56 so as to abut on the upper surface 14 a of the support structure 14. The seventh guide portion 57 and the eighth guide portion 58 are bonded to the fifth guide portion 55 and the sixth guide portion 56, respectively. The fifth guide portion 55 and the sixth guide portion 56 are coupled to the first to fourth guide portions 51 to 54 by four sets of tightening bolts 60a and tightening nuts 60b. By tightening the tightening bolt 60a and the tightening nut 60b, the first friction material 61 is tightened between the third guide portion 53 and the upper surface 14a of the support structure 14, and the second friction material 62 is the fourth guide. It is clamped between the portion 54 and the top surface 14 a of the support structure 14. The frictional force generated between the upper surface 14 a of the support structure 14 and the first friction member 61 and the second friction member 62 restricts the movement of the pipe 12 in the direction perpendicular to the axis. On the other hand, the axial movement of the pipe 12 is restrained by the frictional force generated between the lower surface portion 42 b of the abutting shoe 42 and the upper surface 14 a of the support structure 14.

  In the second embodiment, a tightening force can be applied to the first friction member 61 and the second friction member 62 by the tightening torque of the tightening bolt 60a and the tightening nut 60b. By adjusting the tightening force of the first friction material 61 and the second friction material 62, the friction force of the first friction material 61 and the second friction material 62 changes, so that the release load of the pipe 12 can be changed to an arbitrary load. Can be set. That is, when the predetermined release load Lr is set, the pipe support 41 (that is, the shoe 42 and the guide 43) moves relative to the support structure 14 when a load exceeding the release load Lr is applied to the pipe 12. The tightening force of the first friction material 61 and the second friction material 62 is adjusted. In this case, when a load exceeding the release load Lr acts on the pipe 12, the pipe support 41 slides and moves with respect to the support structure 14 together with the pipe 12, but the pipe 12 is still supported by the pipe support 41. That is, the support function of the pipe 12 by the pipe support 41 is maintained.

  Also in the second embodiment, as in the first embodiment described above, the release load Lr is set to the load acting on the pipe 12 when the level 2 earthquake motion occurs. In this case, when a level 1 earthquake motion occurs, both the restraining function and the supporting function of the pipe 12 by the pipe support 41 are maintained. On the other hand, when a level 2 earthquake motion occurs, the piping support 41 moves with respect to the support structure 14 to release the restraint of the piping 12, thereby preventing a large stress from being generated in the piping 12. Leakage of contents due to damage to the piping 12 can be prevented. Furthermore, even if the restraint of the pipe 12 is released, the pipe 12 is supported by the pipe support 41, so that the support function of the pipe 12 is maintained against a large aftershock that may occur after the level 2 earthquake motion. Can.

  The present invention has been described above based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to the combination of the respective constituent elements, and such modifications are also within the scope of the present invention.

  In the above-described embodiment, the mesh spring is exemplified as the friction material, but the type of the friction material is not particularly limited, and may be rubber or resin, for example.

  In the first embodiment described above, the movement of the pipe in the axial direction is restricted by the friction force of the friction material. In the second embodiment, the movement of the pipe in the direction perpendicular to the axis is restricted by the friction force of the friction material. ing. However, the movement of the pipe in both the axial direction and the direction perpendicular to the axis may be restricted by the frictional force of the friction material. That is, in the present invention, the movement in at least one direction perpendicular to the axial direction of the pipe may be restrained by the friction force of the friction material.

  In the above-described embodiment, the pipe is installed so that the axial direction is horizontal, but the installation direction of the pipe is not particularly limited, and for example, the pipe may be installed so that the axial direction is the vertical direction. .

  10 piping mounting structure, 12 piping, 14 support structure, 16, 41 piping support, 18 clamp, 20, 43 guide, 21 first gripping part, 22 second gripping part, 23a first tightening bolt, 23b first tightening Attaching nut, 24a second tightening bolt, 24b second tightening nut, 30, 61 first friction material, 31, 62 second friction material, 42 shoe, 60a tightening bolt, 60b tightening nut.

Claims (2)

A pipe mounting structure for mounting a pipe to a support structure,
A pipe support connecting the pipe and the support structure;
A friction material interposed between the pipe and the pipe support;
A tightening member that tightens the friction material between the pipe and the pipe support so that the pipe moves relative to the pipe support when a load exceeding a predetermined release load is applied to the pipe. A tightening member for applying a tightening force to the friction material;
Equipped with
The predetermined release load is set to a load acting on the pipe when a level 2 earthquake occurs .
The piping support includes a guide and a clamp fixed to the guide,
The guide includes a first guide portion and a second guide portion that are fixed to the support structure by a fixing member,
By sandwiching the pipe disposed on the predetermined surface of the support structure from the both sides with the first guide part and the second guide part, the movement of the pipe in the direction perpendicular to the axis is restricted,
The clamp includes a pair of first gripping portions and a second gripping portion which are disposed to face each other with the pipe interposed therebetween,
The friction material is interposed between the pipe and the first grip portion and the second grip portion,
The clamping member clamps the friction material between the pipe and the first grip portion and the second grip portion.
The axial movement of the pipe is restrained by the frictional force generated between the pipe and the friction material,
A pipe mounting structure in which a tightening force applied to the friction material is adjusted so that the pipe moves relative to the clamp when a load exceeding the predetermined release load is applied to the pipe.   The pipe mounting structure according to claim 1, wherein the friction material is a mesh spring.

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