JPS60188681A - Supporter for pipe group bend section - 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 group 'a', and is particularly useful for suppressing vibrations in a bent pipe section of a tube group when the number of pipes constituting the tube group is large. The present invention relates to a suitable tube group support device.

[Background of the invention]

For example, in a pressure tube reactor, the pressure tube assembly that contains the fuel rods and is inserted into the reactor body has pipes for guiding fluid that extracts the heat generated from the fuel rods. connected to the tube. These pipings are supported outside the reactor by forming a group of pipes having an appropriate piping pitch in consideration of ease of installation and workability.

FIGS. 1 and 2 show a 0I11 plan view and a front view of a support means for a bent pipe portion of a conventional pipe group. As shown in these figures, the support structure 2 for the pipe group includes a restraining member 3 such as wire or U-selt for restraining the movement of the pipe 1, and the restraining member 3 is υ by explosion welding or screwing. It consists of a rod-shaped support member 4 for holding and supporting the weight of the pipe 1, and a frame 5 for fixing the support member 4°. The formwork 5 is connected to a suitable support device (not shown) from a building structure (not shown) located near the periphery of the formwork 5 or a support frame (not shown) installed on the building structure. ), etc. υ) to support the tube group.

FIG. 3 is a front view showing another example of the conventional pipe group support structure. In this example, two wires 6 are wound around the outer circumference of the pipe 1, and a tensile force is applied to both ends of the wires 6. This structure restrains and supports the pipe group 1 by adding and fixing it to the formwork 5.

The conventional pipe group support structure shown in FIG. gi, FIG. z, and FIG. 5 is assigned g1
It is installed at an angle of 90° to the axial direction. Therefore, when applied near the bent pipe part of a pipe group, as shown in FIG. The distances along the center axis of the pipe to the support point of the pipe are 11 and t2 (tx
<tx).

By the way, the minimum dimension of the above-mentioned dimension t1 and the distance d between the center axes of adjacent pipes in the pipe group is determined from the installation and workability of the pipes or the installation and workability of the pipe group support structure. Therefore, for example, as the output of pressure tube reactors increases, the number of fuel rods and therefore the number of pressure tube assemblies increases, and as a result, the number of connected pipes increases. When the number increases, the difference between the 42nd dimension and 41st dimension also tends to increase.

Generally, for pipes with the same diameter and wall thickness and made of the same material, the natural frequency of the pipe depends on the distance between the support points, and the shorter the distance between the support points, the higher the natural frequency. Therefore, if the difference between the 42nd dimension and the 11th dimension is large as in the conventional example described above, this will result in a significant difference in the natural frequencies of the pipes constituting the group of pipes in the curved pipe section between the support points of the support structure. There is a possibility that the natural frequency of the outer curved pipe of the pipe group will not be sufficiently higher than the frequency of the seismic waves.

This may not be a problem especially in nuclear reactor facilities where earthquake resistance is strongly required.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe group bent tube support device that can sufficiently suppress vibrations in the pipe bent tube section even when the number of pipes constituting the tube group is large.

- [Summary of the Invention] A pipe group bent pipe section support device of the present invention includes a restraining member for a container of a tube group including a bent pipe section, and a structure that holds the restraining member, and a structure that holds the restraining member. The distance from to each of the restraining members is determined so that the natural frequencies of the restraining part of the container tube including the curved pipe part are substantially equal.

If all the tubes in the tube group have the same diameter, wall thickness, and material, the above distances are set to be the same.

[Embodiments of the invention]

An example of a real cannon according to the present invention is shown in FIG. 4. In Figure 4,
A restraint member 3 such as a U-shaped wire or a U bolt that restrains the movement of the pipe 1, and the restraint member 3 is held by welding or screwing,
A support structure is composed of a plate-shaped support member 4 that supports the weight of the pipe 1 and a formwork 5 in which the support member 4 is welded and fixed, and the formwork 5 is connected to a nearby building (not shown) or a support frame. (not shown) to support the tube group.

The view seen from the axial direction of the tube group is similar to FIG. 2.

The distances from each restraint member 3 to each piping bent pipe section are all arranged to be equal. Therefore, for example, the distance t1/ from the innermost pipe bent pipe section to the restraining member 3 is equal to the distance t2' from the outermost pipe bent pipe part to the restraining member 3.

FIG. 5 shows another embodiment of the present invention, and FIG. 6 is a partial view of this as seen from the axial direction of the pipe. In this embodiment, the pipe restraining member 7 has a series of steps in shape as shown in FIG. 5 when viewed from the side, and holds each pipe from both sides as shown in FIG. 6 when viewed from the pipe axis direction. It consists of a pair of plates cut in half and put together. On both sides of each pipe holding portion of each restraint member 7, a single protrusion plate 8 and a pair of protrusion plates 9 protrude every other time. The outer circumferential end portion is fitted or welded to the formwork 5 (FIG. 6). The formwork 5 is attached to a building (not shown) near the formwork.
Alternatively, the p-tube group is supported by being supported by a support frame attached to it.

Although not shown, in FIG. 5, a support structure symmetrical to the above-mentioned support structure is provided on the other side of the tube group bent pipe section.

In this embodiment as well, the distances from the pipe holding part of each restraining member to the respective pipe bending parts are all equal, and therefore, for example, the distance t1'=t2' in the figure is similar to the above. be.

In each of the above embodiments, the distance relationship between the pipe support points given by the restraint part is as described above, so if each pipe has the same diameter, wall thickness, and material, the distance between the support points is All natural frequencies of piping can be aligned.

Note that there is essentially no change even if the pipe bend portion is not bent at 90°.

In addition, if there are substantial differences in the diameter, wall thickness, or material of the pipes, bend the pipes from each support point so that the natural frequencies of the pipes, including the curved parts between the support points of each pipe, are equal. The distance to the pipe portion may be determined for each pipe.

〔Effect of the invention〕

According to the present invention, in a support structure for a pipe group consisting of a plurality of pipes, the distance from the bent pipe part of the pipe group to the support point is Since the natural frequencies of the piping sections are set to be the same, all of the natural frequencies can be made sufficiently higher than the frequency of seismic waves, which is effective for earthquake resistance measures.

[Brief explanation of the drawing]

1, 2, and 3 are a side view and a front view in the tube axis direction of a conventional example, and FIG. 4 is a side sectional view of an actual example of the present invention.
5 and 6 are a side view and a partial front view in the tube axis direction of another embodiment of the present invention. 1... Piping 2... Support structure 3... Pipe restraint member 4... Support plate 5... Formwork 6... Wire 7... Restraint member 8, 9... Projection plate Figure 1 Figure 2

Claims (1)

[Claims] 1. A restraining member for the container of a group of tubes including a bent pipe portion, and a structure for holding the restraining member, from the bent pipe portion of the husband's palace to each of the respective restraining members. 1. A V-group curved pipe support device, characterized in that the total distance between the curved pipe parts and the inherent sliding number of the portion between the restraining members of the container pipe including the curved pipe parts are determined to be substantially equal. 2. The tube group curved tube support device according to claim 1, in which the distances are substantially the same when all the tubes in the tube group have substantially the same diameter, wall thickness, and material. 0