JPS5812996Y2 - Construction steel pipe cap - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cap for covering both ends of steel pipes used at various construction sites.

In construction work, many steel pipes with circular or square cross sections are used to construct molds for pouring concrete, scaffolding, and the like.

At that time, fitting caps made of plastic such as polyethylene, polypropylene, ABS resin, etc. to the open ends of the tube has been practiced for a long time, and various caps have been proposed for this purpose. There is.

Conventionally, such caps have been fitted mainly to prevent fresh concrete, earth and sand, rainwater, etc. from entering the pipe, and within the range of Lj,
Conventional caps had a sufficient function, but recently caps have been introduced to cover the ends of steel pipes from the perspective of not only preventing the inflow of fresh concrete, but also improving safety at work sites. The necessity of doing so has been pointed out.

In other words, the cut ends of steel pipes, especially those cut during the distribution and utilization stage, have sharp edges and small protrusions, so if they touch or collide with them,
They often cause damage to clothing and skin.

Most conventional caps have been incomplete in their ability to prevent such accidents.

Although there are some that have a tube end covering function, such as the one described in Utility Model Publication No. 51-16022,
Since the diameter of the cap is too large than the outside diameter of the pipe, the steel pipe fitted with this cap will bulge at both ends, making it impossible to fit it tightly against the concrete 1 or formwork, and also prevent bundling or stacking. The disadvantage is that it is inconvenient to carry weights.

Against this background, the present invention was completed as a result of repeated research with the aim of providing a cap that particularly ensures reliable coverage of the tube end.

Hereinafter, the present invention will be described with reference to the drawings for typical examples thereof.

Figures 1 to 6 show an example of the cap according to the present invention. Figure 1 is a front view, Figure 2 is a rear view, Figure 3 is a partially cutaway left side view, and Figure 4 is a partially cutaway left side view. AA sectional view in Figure 2 (cut end view, the same applies to this example below), and Figure 5 is B- in Figure 2.
B sectional view and FIG. 6 are CC sectional views taken along line C-C in FIG. 2.

Further, FIG. 7 is an explanatory view of the same cap in use (showing a cross section at the same position as FIG. 5).

This cap is integrally molded from thermoplastic plastic, and its main components are an annular portion 1 with a U-shaped cross section and a lid plate portion 2, as shown in particular in FIG.

As shown in FIG. 7, the annular portion 1 covers the cut end surface of the steel pipe 3 and the inner and outer wall surfaces in the vicinity thereof, and also serves as a means for fixing the cover plate portion 2.

On the wall surface of the groove-shaped portion 4 into which the end of the steel pipe fits during use,
There are raised parts 5 and 6 which will be described in detail later, but apart from these, the annular part 1 itself has the diameter shown in FIG.

is slightly larger than the standard outer diameter of the steel pipe, and the diameter do is slightly smaller than the standard inner diameter d of the steel pipe, resulting in a loose fit with the steel pipe with a gap.

The protuberances 5 and 6 on the two opposing wall surfaces 7 and 8 of the steel pipe insertion portion 4 of the annular portion 1 extend linearly in the steel pipe insertion direction.

These ridges gradually increase in height toward the back.

Further, the protrusions 5 on the wall surface 7 and the protrusions 6 on the wall surface 8 are arranged at equal intervals with their positions shifted so that they do not face each other.

Such a shape and arrangement of the raised portion is preferable in order to facilitate the fitting operation of the cap and ensure secure fixation.

The raised parts 5, 6, at least in their most raised parts, have a height sufficient (preferably slightly larger) to contact the inner or outer wall of the steel pipe to which they are fitted.

In other words, the distance between the tops of two symmetrically located protuberances (see Figure 5) is smaller than the standard outside diameter of the steel pipe, and d
l (see Figure 6) is larger than the standard inner diameter d of the steel pipe.

When using, align the opening of the steel pipe insertion part 4 with the end surface of the steel pipe, push it firmly or tap it lightly with a hammer, etc., and press the annular part 1.
Push it in until the 1C part of comes into contact with the end face of the steel pipe.

At this time, the raised portions 5 and 6 are deformed or partially shaved off at the corners of the tube end, and as they are, they are strongly pressed against the tube wall by the elasticity of the annular portion 1.

When the fitted state as shown in Fig. 7 is completed in this way,
The opening of the steel pipe 3 is closed and the cut end is completely covered.

Due to the action of the ridges 5 and 6 that sandwich the steel pipe 3 from both sides as described above, the cap is securely fixed even if there is some error in the pipe diameter or wall thickness, and even if it is roughly handled. It won't come off.

In addition, unlike a simple cover, the annular portion 1 with the raised portions 5 and 6 covers the tube cut portion and fixes the cap, even if there is so-called paris, some distortion of the cutting line, or an error variation in the tube diameter. It is almost unaffected, so its effectiveness is certain.

Even if the cap according to the present invention is fitted, the apparent diameter of the pipe at the end of the pipe increases very little, so when it is necessary to tightly fit the pipe to the formwork to fix the conchnaut formwork. But it's not a hindrance at all.

FIG. 8 is a rear view showing another example of the cap according to the present invention;
FIG. 9 is a sectional view taken along line A-A in FIG. 8.

The symbols in the figures have the same meaning as the same numbers without a dash in Figures 1-6.

However, 9 is a reinforcing piece to prevent deformation of the cap.

The usage is exactly the same as the previous example.

The cap according to the present invention has many features as mentioned above, so it not only improves safety at work sites, but also improves safety at work sites.
It is extremely effective in extending the life of pipes and improving the efficiency of construction work using pipes.

[Brief explanation of the drawing]

1 to 6 show one example of the cap according to the present invention, and FIG.
, 9 show another example of the cap according to the present invention, in which FIG. 1 is a front view, FIGS. 2 and 8 are rear views, FIG. 3 is a partially cutaway side view, and FIG. ~ Figures 6 and 9 are cross-sectional views. Moreover, FIG. 7 is an explanatory diagram of the state in which the cap of the first example is used. 1: Annular part, 2: Cover plate part, 3: Steel pipe, 4: Steel pipe insertion part, 5, 6: Raised part, 9: Reinforcement piece.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) An annular shape with a substantially U-shaped cross section that covers the cut end face of the steel pipe and the inner and outer wall surfaces in the vicinity, and is sized to fit loosely into the steel pipe. and (b) a cover plate portion located at any position on the inner wall of the annular portion; are integrally molded of plastic, and two opposing wall surfaces of the steel pipe fitting portion of the annular portion are provided with a cover plate portion located at any position on the inner wall of the annular portion. A plurality of ridges extending in the shape of a sliver are formed in a staggered arrangement so that they are not located at opposing positions on the two wall surfaces, and the ridges are in close contact with the inner and outer walls of the steel pipe, so that the entire structure forms the end of the steel pipe. A cap for a steel pipe for construction work, characterized in that it is fixed to.