JPS6141517Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides a square pipe that can be quickly and reliably connected to each other when constructing a structure (for example, a piping support frame in a nuclear power plant) using square pipes. The present invention relates to the structure of the connecting part of the mold pipe.

Currently, structures are constructed using U-shaped and H-shaped beams, but dust accumulates in the recesses, making it unfavorable for the work environment.In particular, structures in nuclear power plants (for example, pipe support frames, etc.) are prone to radioactive dust. The accumulation of water may have an adverse effect on the human body during periodic inspections, etc. Therefore, it has been adopted to cover the recessed portions, but this work requires a large amount of time and manpower and is uneconomical.

Therefore, it is also being considered to use square tubes instead of U-shaped or H-shaped beams.

However, when one side of a square tube is combined with one end of another square tube and connected by welding, the result is as shown in FIGS. 1 and 2. That is, since the square tubes 1 and 2 of the same shape and square cross section both have a radius at the outer corner, if they are put together without removing the bevel, the connection end of the square tube 1 and the R part of the square tube 2 will be connected. Welding is difficult because a gap a is created between them, and the connecting end of the square tube 1 is cut out to match the R shape of the square tube 2 and finished in an inverted concave shape as shown in Fig. 4. It was difficult to form a bevel around the connecting end of the square tube 1. The same thing happened when connecting square tubes with rectangular cross sections.

This invention is related to the connection structure of rectangular pipes in nuclear power plants, which was created in view of the above circumstances.
When connecting square tubes by welding one end of the square tube having the same width as the one side to one side of the square tube with an R-shaped corner, the side of the square tube to be connected exceeds the wall thickness. It is characterized by being cut diagonally.

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

One side of the connection end of the square tube 1, which has the same shape as the square tube 2 with a square cross section, is bent at an arbitrary angle (for example, 45
゜) from the outside so as to exceed the wall thickness of the square tube 1. Also, the side opposite to one side of the square tube 1 is also cut symmetrically (see Fig. 3).

When viewed from the machined surface after cutting as described above, the machined surface has an inverted concave shape with rounded corners as shown in FIG.

When the square tube 1 as described above is assembled on one side of the square tube 2 so that the sides facing the cutting process are in the width direction of one side of the square tube 2, the outside of the square tube 2 is Since the corners are rounded, it looks as if it is wedged in by α as shown in FIGS. 5 and 6. Therefore, the gap between the R portion of the square tube 2 and the connection end of the square tube 1 facing the R portion is significantly narrowed, and the gap between the R portion of the square tube 2 and the connecting end of the square tube 1 that is not facing the R portion becomes narrower. The connecting end, the so-called cutting part, has a beveled shape, which makes it convenient to assemble and weld without having to cut the bevel (see Figures 5 to 7). (see figure).

Fig. 8 shows another embodiment of the present invention, which shows assembly and welding of rectangular tubes 3 and 4 having quadrilateral shapes that do not have the same cross-sectional shape, and in which the present invention is applied to the rectangular tube 3. It is. Square tubes of any shape can be connected as long as one side facing the connection of the square tubes connected in this way has the same width as one side of the square tubes to be connected.

Furthermore, regarding the cutting of one end of the connecting end of the rectangular pipes to be connected, if the cutting is done to more than twice the wall thickness, the connecting end will float during assembly, making welding difficult. It is preferable that the thickness be within twice the thickness.

As described above, according to the joint structure of square pipes in a nuclear power plant according to the present invention, the entire circumference can be welded with a uniform amount of welding during assembly welding of square pipes, which is superior in terms of strength. There is no need for special bevel processing, and the connecting structure of the rectangular tube itself is simple, so it exhibits excellent effects.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the assembled state when assembling and welding square tubes together, Fig. 2 is a view taken in the direction of the arrow in Fig. 1,
Fig. 3 is a side view showing the connection structure of rectangular pipes in the nuclear power plant of the present invention, Fig. 4 is a view taken in the direction of Fig. 3, and Fig. 5 is the connection of rectangular pipes in the nuclear power plant of the present invention. FIGS. 6 and 7 are side views showing assembly and welding using a partial structure, FIGS. 6 and 7 are views taken in the direction of FIG. 5, and FIG. 8 is a perspective view showing another embodiment employing the present invention. 1, 2, 3, 4...square tube.

Claims (1)

[Scope of utility model registration request] When connecting square tubes by welding one end of the square tube having the same width as the one side to one side of the square tube with an R-shaped corner, the side of the square tube to be connected exceeds the wall thickness. A joint structure of rectangular pipes in a nuclear power plant characterized by diagonal cutting.