JP2011012778A - Piping support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive support device which is a piping support device in the vicinity of a container, and reduces an earthquake load while absorbing a thermal elongation displacement without restraining the piping in a thermal elongation direction of the container and without causing an excessive load, and which can be attached even to an existing support device.SOLUTION: The piping support device includes the container, the piping and a support disposed in a reinforced concrete wall penetration part, and is structured to have an elastic body which is placed between the piping and the support device, and has load-displacement characteristics softer than a conventional support device and releasing deformation due to the thermal elongation of the container while restraining damage by resonance of the container and the piping due to earthquake vibration, in order to avoid resonance of the container and the piping and to restrain excessive displacement by the earthquake load, and to make it possible to change the load-displacement characteristics of the elastic body.

Description

  The present invention relates to a pipe support device that supports pipes via structures such as concrete walls in facilities such as power plants and chemical plants that have pipes that transport various fluids such as gas, liquid, and powdered fluid.

  In the above equipment, conventionally, the piping is allowed to move in order to prevent the piping from being displaced beyond an allowable range, for example, 100 mm, due to an external force such as an earthquake and coming into contact with the structure or the like to be damaged. A pipe support device was provided to restrain the area. For example, a conventional pipe support device has a frame structure that completely restrains displacement or a frame structure that allows displacement of a mechanical vibration isolator or the like (see Patent Document 1).

JP-A-9-170680

  In the conventional pipe support device in the vicinity of the fluid container, if the pipe is completely restrained against the displacement in the heat extension direction of the container, an excessive load is applied to the container, so that it is difficult to support the pipe in the heat extension direction of the container. It was. Conventionally, mechanical snubbers have been used as a support mechanism that combines the restraint of displacement in the direction of heat expansion of pipes and the suppression of seismic vibrations. Was difficult due to space constraints. SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive support device that has both absorption of displacement of a pipe due to thermal expansion of the pipe and reduction of seismic load, and can be attached to an existing support apparatus.

  In order to solve the above object, the following configuration is adopted in the present invention. In a pipe support device consisting of piping connected to a vessel that causes thermal deformation and a support installed in the reinforced concrete wall penetration, damage due to resonance between the vessel and piping due to earthquake vibration and excessive displacement due to thermal elongation are suppressed. Therefore, an elastic body with a load displacement characteristic that is softer than that of the conventional support device is installed between the pipe and the support device so as to prevent deformation caused by thermal expansion of the vessel while suppressing damage caused by resonance between the vessel and the piping due to earthquake vibration. The supporting device is installed, and the load displacement characteristics of the elastic body can be changed.

  According to the pipe support device of the present invention, it is possible to add to the existing support structure with a simple configuration, and in addition to the conventional vibration control function, the elastic body is installed with the seismic load in the direction of thermal expansion of the container which has been difficult until now. It is possible to reduce the cost by avoiding resonance and to secure a sufficient seismic margin. Further, since the thermal expansion of the container is not constrained, it is possible to minimize the load on the piping due to the thermal expansion and prevent the piping from being damaged.

It is the front view seen from the piping axis direction of Example 1 of the present invention. 2 is a cross-sectional view taken along a piping axis of Example 1. FIG. It is the front view seen from the piping axis direction of Example 2. It is the front view seen from the piping axis direction of Example 3. It is a graph which shows the deformation load displacement characteristic (linear) of an elastic body. It is a graph which shows the deformation load displacement characteristic (nonlinear) of an elastic body. It is a graph which shows the deformation load displacement characteristic (gap) of an elastic body.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a pipe support device according to a first embodiment. In the container 1, the pipe 2 connected to the container 1, and the pipe support device 4 attached to the reinforced concrete wall 3, an elastic body 6 is attached to the pipe support device 4 in parallel with the heat expansion direction 5 of the container 1. Fixed by. Next, the support pad 8 is installed between the elastic body 6 and the pipe 2, and the pipe 2 is held on the pipe support device 4 by the compression restoring force of the elastic body 6. The holding load is transmitted to the pipe 2 by the pipe 2 and the support pad 8 being in pressure contact with each other. S is a space through which the pipe 2 provided on the reinforced concrete wall 3 is passed.

Regarding the load displacement characteristics of the elastic body, the spring constant of the elastic body is set to a value not exceeding 1 × 10 ⁴ N / mm. If the spring constant is larger than this, the rigidity becomes large, an excessive load is applied to the pipe, damage due to excessive displacement occurs, and an appropriate vibration damping effect cannot be obtained. At this time, the displacement of the pipe 2 can be suppressed to about 100 mm or less by the above structure.

  The load displacement characteristics of the elastic body 6 are for the purpose of avoiding resonance between the natural frequency of the pipe 2 and the natural frequency of the container 1 in the direction of thermal expansion by damping the seismic vibration, and suppressing excessive displacement of the pipe 2. Therefore, it is assumed that there is no rigidity high enough to restrain the thermal elongation of the container 1 itself. An elastic body having an optimal spring constant can be selected and replaced according to the size and material of the pipe.

  In FIG. 3, the piping support apparatus by Example 2 of this invention is shown. An additional support member 9 inclined in an oblique direction is installed on the existing pipe support device 4, a support member 7 is installed, and an elastic body 6 is attached. Since the existing pipe support device 4 supports the direction perpendicular to the heat expansion direction of the container 1, the elastic body 6 can be installed in this way.

FIG. 4 shows a pipe support device when the elastic body 6 can be installed only in one direction of the pipe 2 according to the third embodiment of the present invention. A pipe support member 10 is installed in such a manner as to sandwich the pipe 2 and the elastic body 6 is connected thereto. This structure can provide both compression and tensile force to the pipe 2 with only a single elastic body, and can realize vibration suppression and displacement suppression of the pipe 2.
[Elastic body load displacement characteristics]
The load displacement characteristics of the elastic body 6 can be linear or non-linear, and various effects can be obtained depending on the characteristics. As shown in FIG. 5, when the load displacement characteristic of the elastic body is linear, the natural frequency of the pipe is constant regardless of the displacement, and the response of the entire system of the pipe support device can be easily predicted.

  FIG. 6 shows the relationship between the load and the displacement when the load displacement characteristic of the elastic body is nonlinear. When the load displacement characteristic of an elastic body is non-linear, the load displacement characteristic of the elastic body is softened in the range of thermal elongation to suppress the load due to thermal elongation, and hardened in the range exceeding the thermal elongation, so that vibration due to seismic load is suppressed. Suppressing damping effect can be obtained.

  Further, as shown in FIG. 7, it is possible to eliminate the load due to the thermal elongation by configuring so as to displace with no load until a certain displacement so as to absorb the gap of the thermal elongation in advance. This can also be realized by giving a certain clearance to the elastic body.

DESCRIPTION OF SYMBOLS 1 ... Container 2 ... Piping 3 ... Reinforced concrete wall 4 ... Pipe support device 5 ... Heat expansion direction 6 of container ... Elastic body 7 ... Support member 8 ... Support pad 9 ... Additional support member 10 ... Pipe support member

Claims (10)

In a pipe support device having a container, a pipe connected to the container, and a support member that is installed in a support structure and supports the pipe,
Between the pipe and the support member, a support device having an elastic body having a soft load displacement characteristic that releases deformation due to thermal expansion of the container while suppressing damage due to resonance between the container and the pipe due to seismic vibration is installed, and the container And a piping support device that suppresses excessive displacement with respect to the support structure.   2. The pipe support apparatus according to claim 1, wherein the elastic body is replaceable with an elastic body having different load displacement characteristics.   The piping support device according to claim 1 or 2, wherein the elastic body is pressed against the piping through a support pad.   3. The pipe support apparatus according to claim 1, wherein the support apparatus includes an additional support member inclined in an oblique direction.   3. The pipe support apparatus according to claim 1, wherein the support apparatus supports the pipe via a pipe support member that sandwiches the pipe. 3. The pipe support apparatus according to claim 1, wherein a spring constant of the elastic body is set to a value not exceeding 10 ⁴ N / mm. ⁴ .   3. The pipe support apparatus according to claim 1, wherein the displacement with respect to the support structure is a value not exceeding 100 mm.   3. The pipe support apparatus according to claim 1, wherein a load displacement characteristic of the elastic body is linear.   9. The pipe support apparatus according to claim 8, wherein the load displacement characteristic of the elastic body is linear including a no-load displacement characteristic.   The pipe support apparatus according to claim 1 or 2, wherein a load displacement characteristic of the elastic body is non-linear.

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