JPS61167790A - Supporter for pipe group - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a support device for a tube group, and in particular, in various plants such as pressure tube nuclear reactors, when the number of pipes constituting a tube group increases, The present invention relates to a support device for a group of pipes suitable for suppressing vibrations in a bent pipe section of a group of high-temperature pipes.

[Background of the invention]

FIGS. 7 and 8 show a configuration of a tube group of the inlet piping of a conventional pressure tube nuclear reactor and a conventional support device array for the tube group.

A plurality of pressure tube assemblies 109 are inserted into a reactor body (not shown) of a pressure tube type nuclear reactor.

Each pressure tube assembly 109 has a fuel rod (not shown).
The fuel rods are split by neutrons and generate heat. Therefore, in order to extract the heat generated from the fuel rods in the pressure pipe assembly 109, the inlet pipes 108 are connected to the pressure pipe assembly 109, and the high temperature and high pressure fluid contained in the inlet pipes 108 is transferred from the artificial pipe 108 under pressure. It is designed to be sent to a tube assembly 109.

As shown in FIGS. 7 and 8, a plurality of pressure pipe aggregates 1
The inlet pipes 108 respectively connected to the pipes 09 are connected with an appropriate pipe pitch in consideration of installation and workability. Further, in order to improve the health and earthquake resistance of the artificial pipe 108, support structures 110 are installed at certain intervals in the horizontal and vertical parts of the inlet pipe 108. Since the inlet pipe 108 constitutes a tube group as described above, the support structure 110 is a tube group support structure that has a structure different from a conventional single tube support structure.

Next, a conventional tube group support device and method will be described with reference to FIGS. 9 and 10.

A support structure 110 for a pipe group shown in FIG. 9 includes a restraint member 3 such as a wire or a U-bolt for restraining the movement of the pipe 4, supports the restraint member 3, and supports the weight of the pipe 4, etc. It is composed of a support member 1 for use in the construction, and a formwork 5 for fixing the support member 1. The formwork 5 is provided with an appropriate support device (not shown) for a building structure (not shown) located near the periphery of the formwork 5 or a support frame (not shown) installed on the building structure. Supported through.

In addition, as shown in Fig. 1θ, the formwork 5 is installed at an angle of 90° with respect to the axial direction of the pipe 4, taking into account the ease of installation and workability of the formwork 5, the supporting effect on the pipe 4, etc. Ru.

When this conventional method of supporting a pipe group is applied to the vicinity of the bent pipe part of the pipe group, as shown in Figure 1O, the innermost pipe group and the outermost pipe group of the pipe group are The distance between the center line of the piping axis between the two supporting points sandwiching the part is relatively 61 and As (
tt <1! ) will be different. In this case, 61 above
The dimensions and the distance between the centers of adjacent pipes 4 in the pipe group are:
Installation of piping 4.

Workability or ease of installation of the pipe group support device 110, etc.

Minimum critical dimensions are determined based on workability.

Therefore, for example, as the output of pressure tube reactors increases,
If the number of fuel rods increases and at the same time the number of pressure tube assemblies 1090 increases, and as a result, the number of inlet piping 108 increases, etc., the number of pipes constituting the tube group increases, the above 6.
2 dimensions and 1. Dimensional differences also tend to increase.

Generally, for piping systems made of the same material with the same pipe diameter and wall thickness, the magnitude of the natural frequency of the piping system depends on the distance between the supporting points, and the shorter the distance between the supporting points, the more the natural frequency of the piping system. The vibration frequency increases and earthquake resistance improves. Therefore, as described above, if the difference between dimensions 62 and 61 increases significantly, it will result in a significant difference in the values of the same frequencies of the piping systems that make up the pipe group, and the seismic resistance of the piping system will decrease. may occur.

In order to avoid the above-mentioned drawbacks, for example, as the number of pipes constituting a tube group increases due to the increase in the output of pressure tube nuclear reactors, as a method of supporting a tube group with high earthquake resistance, the pipe shown in Fig. 11 is used. There are ways to support groups.

In other words, for two adjacent pipes 4 in the pipe group, the reference line is a straight line that passes through the axial center line of each of the two pipes 4 and makes an angle of 90' with the axial center line of each pipe 4. shall be. A restraining member 3 for suppressing vibration of the pipe 4
Alternatively, support the pipe 4 appropriately so that the angle formed by the reference line and the straight line connecting the support points of the support member 1 for supporting the pipe 4, which supports the weight of the pipe 4, is greater than 0° and less than 90'. . Further, a formwork 5 for fixing the restraint member 3 and the support member 1 is provided, and the formwork 5 is attached to a building structure (not shown) or a support frame (not shown) appropriately supported by the building structure. This method is supported by a suitable support device (not shown). According to this support method, the distance between the support points of the pipes 4 is adjusted appropriately so that all the pipes 4 constituting the pipe group, including the curved pipe parts, have the same natural frequency. Therefore, all vibrations of the pipe 4 can be sufficiently suppressed.

However, as shown in FIG. 11, if one end of the tube group is connected to a high-temperature device 6, etc., 61 shown in the same figure
Due to the different dimensions and 62 dimensions, the stresses that occur in the support device as a result of thermal expansion of the tube group are different for each of the pipes 4. Therefore, for example, as the output of pressure tube reactors increases, the number of fuel rods increases, and at the same time the pressure tube assembly 10 increases.
When the number of pipes constituting the pipe group increases, such as an increase in the number of pipes 9 and, as a result, an increase in the number of inlet pipes 108,
The difference between the 61st dimension and the 62nd dimension also tends to increase. As a result, if the difference between the t1 dimension and the 62 dimension increases significantly, the thermal stress generated in the piping system may increase depending on the above-mentioned difference in support method.

[Purpose of the invention]

It is an object of the present invention to sufficiently suppress vibrations in all of the curved pipe sections even when the number of pipes constituting the pipe group increases, and to sufficiently suppress vibrations in the vicinity of the curved pipe sections even if the pipe group is a high-temperature group. The object of the present invention is to provide a support device for a tube group capable of reducing the thermal stress generated.

[Summary of the invention]

In order to achieve the above object, the present invention provides support for a pipe group consisting of a restraining member attached to each pipe of a pipe group consisting of a plurality of pipes, and a support member connecting each of the restraining members. The device is characterized in that the support member is provided with a slide mechanism that is movable in the axial direction of the support member. Further, it is preferable that the sliding mechanism of the support member has a spring effect. With this configuration, even if the number of pipes constituting the pipe group increases, it is possible to sufficiently suppress the imaging of all the pipe bends, and even if the pipe group is a high-temperature pipe group, the elongation of the pipes due to thermal expansion can be absorbed. , it is possible to reduce thermal stress generated near the curved pipe portion.

[Embodiments of the invention]

Next, each embodiment of the present invention will be described with reference to FIGS. 1 to 6.

Figure 1 shows an embodiment of the present invention. FIG. 2 is a side view of FIG. 1.

A half-split restraint member 3 is fixed to each pipe 4 constituting the pipe group. The restraining member 3 includes an outer cylinder 8 and an inner cylinder 7, respectively.
An appropriate gap is provided between the outer cylinder 8 and the inner cylinder 7, which are connected via a support member composed of a bottle 9 and a support member 9, in the axial direction of the support member (Y direction in the figure). Allows for slides. A suitable gap is also provided between the restraint member 3 and the bottle 9 to allow rotation of the bottle 9 relative to the restraint member 3. In addition, the outer cylinder 8, inner cylinder 7, and bottle 9 constituting the support member are connected to the pipe 4 in the out-of-plane direction of the two pipes 4 (Z direction in the figure).
It is made of a material with sufficient rigidity, plate thickness, etc.

According to the above configuration, as shown in FIG.
One end of group 5 is connected to high-temperature equipment 6, and even if the piping extends in the axial direction of piping 4 (in the Y direction in the diagram) due to thermal expansion of the piping at the connection part (the rising piping in the diagram), Due to the sliding mechanism of the support member, the pipe 4 is not restrained at the support point of the pipe 4, and thermal stress generated at the support point is suppressed, thereby improving the soundness of the pipe group due to thermal expansion. Also, according to such a support device, the rigidity in the out-of-plane direction (Z direction in the figure), where the rigidity of the pipe group is low, is captured by the rigidity of the support member, so that the outermost and innermost peripheries of the pipe group are Connect the piping 4 to a building structure (not shown) or a support structure (supported by the building structure)
) to you! . By supporting the structure with , ■ (9 o/' no), the earthquake resistance will be improved.

Next, FIGS. 3 and 4 show other embodiments of the present invention. In this embodiment, the support member has a spring effect. That is, in this support device, the above-mentioned outer cylinder 8
and the inner cylinder 7 are each connected by a spring lO.

According to this embodiment, by appropriately selecting the spring constant of the spring lO, the weight of each pipe 4 in the tube group can be appropriately supported, and the stress caused by the weight of the tube group can be reduced.

FIG. 5 shows yet another embodiment. In this embodiment, for two adjacent pipes 4 of the tube group, the axial center lines of the two arrangements 14 (X direction in the figure) pass through each, and the axial center lines of the pipes 4 The outer cylinder 8 is set so that the angle between the straight line connecting the attachment point of the restraining member 3 to the piping 4 and the reference line exceeds θ° and is less than 90°. , the restraint member 3 is connected by a support member composed of an inner cylinder 7 and a bottle 9.

According to this embodiment, the outermost and innermost pipes 4 of the pipe group are connected to a building structure (not shown) or a support frame (not shown) that is appropriately supported by the building structure using an appropriate support device. (not shown), and by appropriately adjusting the distance between the support points of the pipes 4, all of the pipes 4 constituting the pipe group, including the bent pipe portions, can be The natural frequencies in the out-of-plane direction (two directions in the same figure) can be made to be the same,
Furthermore, it has the effect of improving earthquake resistance.

〔Effect of the invention〕

According to the present invention, for each pipe in a pipe group made up of several rII pipes, the pipe group is made up of a restraining member attached to the pipe and a supporting member connecting the respective restraining members. In this support device, by providing the support member with a sliding mechanism in the support member axial direction, even if the number of pipes composing the pipe group increases, vibrations in the pipe bend section can be sufficiently suppressed, and the pipe Even if the group is a high-temperature pipe group, the elongation of the pipes due to thermal expansion can be absorbed, and the thermal stress generated near the core curved pipe portion can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an enlarged front view of main parts showing one embodiment of the present invention; FIG.
The figure is a side view, FIG. 3 is an enlarged front view of main parts showing another embodiment of the present invention, FIG. 4 is a side view thereof, and FIG. 5 is an enlarged main part showing still another embodiment of the invention. 6 is a front view showing the relationship between the support device of the present invention and the tube group, FIG. 7 is a plan view showing the inlet pipe of a conventional pressure tube reactor and its support structure, and FIG. 8 is a front view showing the relationship between the support device of the present invention and the tube group. 9 is a sectional view showing a conventional support structure, FIG. 1O is a side view thereof, and FIG. 11 is a side view showing the relationship between each piping. 1... Supporting member, 3... Restraining member, 4... Piping,
5... Formwork, 6... High temperature equipment, 7... Inner cylinder, 8...
... Outer cylinder, 9... Bottle, lO... Spring, 108...
・Inlet piping, 109...pressure pipe assembly, 110...
Conventional tube group support device. Ryo 1 figure also 3 figure Rei 4 figure rate 6 figure

Claims (1)

[Scope of Claims] 1. A support device for a tube group consisting of a restraining member attached to each pipe of a tube group consisting of a plurality of pipes and a supporting member connecting each of the restraining members, wherein the support A support device for a tube group, characterized in that the member is provided with a slide mechanism that allows the support member to move in the axial direction. 2. The support device for a tube group according to claim 1, wherein the slide mechanism includes a spring member having elasticity in the axial direction of the support member.