JPS59231289A - Cap structure of end section of square steel - 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] This invention relates to a cap structure having an end sealing function for fM sealing of square steel with a square cross section used for piping support, etc. The elastic force of the leaf springs is used to create different bending angles of the two leaf springs whose bases are attached to the inner surface of the camp, without using a six-contact means. This invention relates to an end cap structure of square steel that increases frictional force.

[Background of the invention]

As is well known, shaped steel is widely used as a variety of building components.For example, steel structures such as piping supports, cable tray supports, duct supports, and operation frames required for many facilities in nuclear power plant facilities are used. Square steel is widely used for its reliability in terms of strength, good jointability with other equipment members, ease of designing space partitioning, etc.

When using square steel, it is necessary to prevent radioactive dust from accidentally accumulating inside the square steel due to the nature of nuclear power plants, and to prevent rust generated internally from scattering to the outside. In order to prevent this, a plate-shaped cap 3 is installed on the end 2 of the square steel 1 in a sealed state, as shown in FIG. I have to.

Until now, seal welding 4 has been used to attach the cap 3.

However, more than tens of thousands of square steel sections 1 are used in the entire nuclear power plant facility, and the caps 3 are attached at 100,000 to 200,000 locations, which requires a significant amount of actual welding work. There was a problem that the number of tasks was large and the tasks were cumbersome.

Furthermore, nuclear power plant facilities have many complex steel structures, and there are parts where it is difficult to attach the cap 3, and therefore there are also areas where it is extremely difficult to weld, which can lead to poor welding soundness and poor precision. It also had some drawbacks.

Furthermore, there are disadvantages in that the construction period is long, and inspections require a lot of time, resulting in high costs.

[Purpose of the invention]

The purpose of the invention is to solve the problem of attaching a cap to the end of square steel based on the above-mentioned prior art as a technical problem, to avoid complicated on-site welding, to enable one-touch welding, and to ensure sealing performance and stability. The present invention is intended to provide an excellent end cap structure of square steel which is beneficial to the field of use of shaped steel in the building industry by maintaining its condition and reducing costs by shortening the construction period.

[Summary of the invention]

The summary of the present invention, which is based on the above-mentioned claims and is in line with the above-mentioned object, is to solve the above-mentioned problems by inserting two spring plates into the inner surface of the cap, which are formed separately from the square steel, and which correspond to the surface. Attach the base with the base fixed, and insert the leaf spring which was expanded and attached to the end of the square steel into the end of the square steel.
It is retracted inward and applies a pressing force to the inner surface of the square steel, creating a frictional force that prevents it from coming out and seals it. At this time, the bending angles of the inner leaf spring and the outer leaf spring are made to be different in advance. Therefore, when the outer leaf spring retracts, a repulsive force is generated between the outer leaf spring and the inner leaf spring, and the pressing force of the outer leaf spring against the inner surface of the square steel is increased, thereby increasing the frictional force.
Technical measures have been taken to prevent it from falling off.

〔Example〕

Next, the first embodiment of the present invention will be explained in general terms with reference to FIGS. 2 and 3. 1, the same aspects as those in FIG. 1 will be explained using the same telephone line.

(1 is made of square steel) A cap 3, which is sealed and sealed against the end portion 2, has a flange 5 covering the outer surface of the end portion 2 around the entire circumference.

6 is a leaf spring, an outer leaf spring 61 and an inner leaf spring 6.
2 to 12 nits, their bases are bent into the same L shape and overlapped, and are integrally fixed to the inner surface of the cap 3 with screws 7.7, and at the bent part 8 in the middle, the outer spring 61 opens outward. The bending angle is larger than that of the inner leaf spring 62.

Further, in this embodiment, four sets of the units of plate springs 6 are provided corresponding to the entire surface of the inner surface 9 of the end part 2 of the square steel 1, and the maximum opening of the opposing units of plate springs 6 is the same as that of the end part 2. The internal spacing has been increased by a set amount.

Please note that the above-mentioned integral formation of the cap 3 and leaf spring 6 has been mass-produced in advance in a standard manner at the factory.The outer leaf spring 61,
The bending angle, mounting position, size, size of the inner plate spring 62,
The number of units is within the scope of design changes.

In the above configuration, when installing the square steel 1 into a piping support, an operation frame, etc. at a work site, the cap 3 is attached to the end 2 of the square steel 1, or the width of the inner surface 9 of the end 2 of the tip of the leaf spring 6 is fixed. When the narrow guide portion 10 is inserted into the end portion 2 and pushed in, the outer plate spring 61 retracts inward, and the widest portion 11 is elastically pressed against the inner surface 9 to prevent the guide portion from being pulled out and generate friction. be made into

When the outer leaf spring 61 retracts inward, it is pushed toward the inner leaf spring 62 having a different bending angle wave, and a repulsive force is generated between the two.
Therefore, a strong pressing force against the inner surface 9 of the end portion 2 is applied to the outer leaf spring 61, and the frictional force is increased, the outer leaf spring 61 is strongly attached to the end portion 2, and the cap 3 is It will be securely fixed to the square steel 1.

The above-mentioned fixing operation can be carried out with one touch, and once it is fixed, it will not easily fall off.

Similarly, the embodiments of the present invention are of course not limited to the above-mentioned embodiments. For example, the leaf spring may be formed with vertical grooves along the axial direction to improve the springiness, or the inner surface of the wall may be formed with vertical grooves along the axial direction. Various methods can be adopted, such as providing a groove at right angles and forming a hook at the tip of the leaf spring to ensure that it is not pulled out.

Furthermore, it goes without saying that the structures to which this invention is applied are not limited to nuclear power plant facilities.

〔Effect of the invention〕

As described above, according to the present invention, the cap, which is installed in a sealed state on the end of square steel used in nuclear power plant facilities, etc., can be fixed with a single touch at the work site, and moreover, it has the advantage of being securely fixed. effect is produced.

In addition, as mentioned above, work can be done with one touch, so construction
This has the excellent effect of requiring only a short period of time, making it possible to work easily and safely in a difficult work area 4ih such as a narrow part, and reducing costs.

(7) Therefore, a set of two leaf springs each corresponding to at least one pair of inner surfaces of the end portions of the square steel is formed in a camp formed in advance separately from the square steel, and the base thereof is completely integrated. Since the cap is formed to open outward with the bent corners bent, the above-mentioned one-touch sale can be performed simply by inserting the leaf spring of the cap into the opening at the end of the square steel.

In addition, since the inner and outer leaf springs are formed with different bending angles, when the outer spring presses the inner surface of the end and retracts, a counterforce is generated with the inner leaf spring, and as a result, the outer spring is applied to the inner surface of the end. This has an excellent effect of increasing the pressing force to secure the cap more securely.

Furthermore, since it is sufficient to simply insert the leaf spring, no skill is required and construction is easier.

Furthermore, when installing rectangular steel in many facilities, the outer leaf spring is firmly fixed even if the caps are installed one after another, so the pre-installability has an excellent effect that the caps will not fall off due to vibrations etc. during later installation.

And since the cap leaf spring can be standardized, it can be measured.

[Brief explanation of drawings]

Fig. 1 is a perspective view of cap installation on square steel according to the prior art, Figs. 2 and 3 are explanatory views of one embodiment of the present invention, Fig. 2 is a partially cutaway perspective view, and Fig. 3 is an explanation of cap installation. FIG. 1... Square steel, 2... End, 3... Cap, 6
・・・Board Pa Figure 2 Figure 3

Claims (1)

[Claims] 1. In the main structure of the cap that is attached integrally and sealed to the end of a rectangular steel with a square cross section, one pair of leaf springs corresponding to at least one pair of circular opposing surfaces of the square peak end are each made of two pieces. Then, the bases of the two leaf springs are integrated and fixed at the r-A foot position on the inner surface of the cap, and bent at different bending angles to open outward, so that the distance between the outer leaf springs is An end b cap structure of a square section steel, characterized in that the inner face diameter of the square section steel is larger than that of the opposing inner surface of the square section steel.