JPS61105386A - Piping pipe-group support structure - 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 structure for a group of piping pipes, and particularly to a support structure for a pipe group.

The present invention relates to a pipe group support structure suitable for reducing the cross-sectional area of a high-temperature pipe group with a large number of pipes.

[Background of the invention]

Examples of inlet piping for conventional pressure tube reactors are shown in Figures 4 and 5.
As shown in the figure.

A plurality of pressure tube assemblies 1 are inserted into the reactor body (not shown) of a pressure tube reactor, and each pressure tube assemblage 1 contains a fuel rod (not shown). There is. The fuel rods undergo nuclear fission due to neutrons and generate heat.

Inlet pipes 2 are each connected to a pressure tube assembly 1 in order to extract heat generated from the fuel rods within the pressure tube assembly 1 .

The high temperature and high pressure fluid in the inlet pipe 2 is sent from the inlet pipe 2 to the pressure pipe assembly l.

4 and 5 show the connection structure and arrangement of the inlet pipe 2 and the pressure pipe assembly 1. Multiple pressure pipe assembly 1
The inlet pipes 2 are respectively connected to.

The pipe group has an appropriate piping pitch that takes into consideration installation and workability.

In order to improve the integrity and earthquake resistance of the inlet pipe 2, support structures 3 are installed at certain intervals on the horizontal and vertical parts of the pipe. Since the inlet piping 2 constitutes a tube group, the support structure 3 is a tube group support structure that is different from a conventional single tube support structure. In other words, if the number of pipes is small, support each pipe individually with hangers, etc.

Although vibration isolators can be installed to provide earthquake support,
Supporting a large number of pipes in this manner requires a large number of hangers and vibration isolators, which are also very difficult and impractical to install.

A conventional pipe group support structure proposed for this purpose will be explained with reference to FIG.

The pipe group support device 3 shown in FIG. 6 includes a restraining member 5 such as a wire or a U-bolt that restrains the movement of the pipe 4, and a support member 6 that supports the restraining member 5 and supports the weight of the pipe 4.
and a support frame 7 to which the support member 6 is fixed.

The spacing between the pipes 4 is determined by the pipe welding work space. Further, the outer periphery of the tube group is covered with a heat shielding heat insulating material 8. Note that 9 is a hanging rod of the support frame 7.

In this way, when the pipes form a group of pipes, in order to increase the installation space around one pipe, it is necessary to reduce the interval between the pipes.

On the other hand, the spacing between pipes is 41j, such as the piping installation work space at the time of installation or inspection during the service period! limited by the research space.

Moreover, in the conventional installation procedure of the support structure, the support frame 7 is installed and then the piping 4 is installed in sequence.

It was difficult to easily access any of the pipes for repair or inspection.

In addition, as a prior art related to this type of structure, there is Japanese Patent Application Laid-Open No. 52-99429.

[Purpose of the invention]

An object of the present invention is to provide a support structure for a group of pipes such as nuclear power equipment, which minimizes the cross-sectional area of the group of pipes while ensuring a space for pipe welding during installation and a space for inspection during service. .

[Summary of the invention]

The present invention provides a pipe group support structure consisting of a support member that holds the pipes constituting the pipe group in a predetermined position and a restraint member that fixes each pipe to the support member, in which the pipes are arranged on a plurality of concentric circles. By forming each support member as an annular plate, the cross-sectional area of the pipe group is minimized, while ensuring space for pipe welding during installation and inspection space during service, and considering the required amount of insulation material and the pipe group. The present invention provides a pipe group support structure that minimizes the amount of heat dissipated.

Embodiment of the invention] An embodiment of the invention will be described with reference to FIG. The respective pipes 4 constituting the tube group are arranged at regular intervals in the radial direction of a plurality of concentric circles and in the circumferential direction of each concentric circle.

The spacing between the pipes is determined so as to ensure a work space for installing the pipes 4 and an inspection space for inspections during the service period.

An annular Ω plate 10 is provided as a support member in the concentric direction,
Each pipe is fixed with U bolts 5.

A reinforcing rib 11 is attached to the annular plate 10 for the purpose of preventing deformation, maintaining concentric radial spacing, and integrating each annular plate. A hanging rod 9 for attaching a hanger or the like for fixing the tube group is attached to the outermost annular plate 10, and the entire tube group is surrounded by a heat insulating material 8.

As described above, according to this embodiment, by arranging the pipes in multiple layers concentrically, the pipe group has a structure with a circular cross section. Therefore, the cross-sectional area of the pipe group is minimized, and the surrounding arrangement space can be used effectively. Furthermore, the heat retaining surface area of the outermost periphery is also minimized, and the amount of heat dissipated to the outside of the tube group is minimized. Furthermore, the amount of heat insulating material is minimized, which also has an economical effect.6 On the other hand, since the distance between the pipes 4 is set to ensure work space during installation and space for inspections during the service period, conventional pipe pipes It has functionality equivalent to group structure. Furthermore, since the pipes are installed in order from the innermost pipe to the outer circumference, it is extremely easy to access the pipes during installation, improving work efficiency. Furthermore, since the cross-sectional area of the tube group of the piping is minimal, the cross-sectional area of the tube group passing through the building structure is also minimized, which is advantageous in terms of the strength of the building structure.

FIG. 2 shows another embodiment of the present invention. This embodiment has a structure in which the tube group itself is supported by U bolts 12.

According to this embodiment, since the tube group structure is a circular tube group structure, there is an effect that the tube group itself can be easily supported by the U bolts 12.

FIG. 3 shows still another embodiment of the present invention. This embodiment is an example in which the piping 4 is sequentially fixed to the outer periphery of each annular plate 13 using U-bolts 5. For example, since the piping 4 is attached to the outer periphery of the annular plate 13, accessibility and workability are further improved.

〔Effect of the invention〕

According to the present invention, since the pipes of the pipe group are arranged in a plurality of concentric circles and each support member is formed as an annular plate, a work space for pipe welding during installation and an inspection space for inspections during the service period are secured. At the same time, a pipe group support structure can be obtained in which the cross-sectional area of the tube group is minimized, and the required amount of heat insulating material and the amount of heat radiated from the tube group are minimized.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of a pipe group support structure according to the present invention, FIG. 2 is a diagram showing another embodiment of the present invention, and FIG. 3 is a diagram showing still another embodiment of the present invention. , FIG. 4 is a plan view showing an example of a tube group structure of reactor inlet piping, FIG. 5 is an elevational view of the same, and FIG. 6 is a diagram showing a conventional pipe group support structure. l... Pressure pipe assembly, 2... Inlet piping, 3... Conventional tube group support structure, 4... Piping, 5... U bolt (
restraint member), 6... support member, 7... support frame 1, 8
... Insulation material (thermal insulation material), 9 ... Hanging rod, 10.
...Annular plate, 11...Reinforcement rib, 12...U bolt, 13...Annular plate.

Claims (1)

[Claims] 1. In a pipe group support structure consisting of a support member that holds the pipes constituting the pipe group in a predetermined position and a restraining member that fixes each pipe to the support member, the pipes are arranged on a plurality of concentric circles. A pipe group support structure characterized in that each supporting member is formed as an annular plate arranged in the same manner as shown in FIG. 2. A pipe group support structure according to claim 1, characterized in that supporting members arranged concentrically are connected by reinforcing ribs.