JPH0135103Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a cylindrical collar used for the connection part of a propulsion hume tube, and particularly for a propulsion hume made of fiber reinforced plastic (hereinafter referred to as FRP). It concerns tube collars.

<Conventional technology> Traditionally, steel tar-painted colors have been used as the colors for propelled fume pipes, but the problem has been that the colors corrode and deteriorate due to acids, alkalis, organic substances, etc. in the soil and wastewater. Recently, FRP collars have been developed and used as one of the countermeasures against this problem. This FRP is a composite material made of unsaturated polyester resin, vinyl ester resin, epoxy resin, etc. reinforced with fiber reinforcement such as glass fiber, and has excellent mechanical strength and corrosion resistance, so it can be used underground. It is suitable as a material for hume canal collars that require high quality.

However, when the Huyum tube is propelled, the circumferential end of the collar is subject to localized concentrated loads due to contact with sand and gravel in the ground, friction, or biting of sand and gravel, or bending and correction of the tube due to propulsion. Due to the circumferential load that occurs during this process, large-scale cracking occurs at the circumferential end, and as a result, the water-stopping effect of the collar at the humuum pipe connection section may be lost. It was hot.

<Problems to be solved by the invention> The present invention is a completely new technology that fundamentally modifies the above-mentioned drawbacks of the conventional technology. The aim is to provide a reinforced FRP collar.

<Means for solving the problem> The present invention involves fitting and fixing a metal ring to the circumferential edge of a fiber-reinforced plastic collar, or embedding a metal ring in a part of the circumferential edge. This is a collar for Huyum tubes that is characterized by its structure.

<Function> As mentioned above, in the present invention, the metal ring is fitted into the circumferential end of the FRP collar or embedded within it, so this circumferential end can be significantly strengthened. As a result, it may come into contact with sand and gravel in the ground, causing damage due to sand and gravel digging into the circumferential end, or the circumferential load that occurs when the pipe bends or warps during propulsion. Even if it is subjected to damage, it is possible to prevent damage such as cracks from occurring at the circumferential end.

<Example> To specifically explain one embodiment of the present invention with reference to the drawings, in Fig. 1, reference numeral 1 denotes an FRP collar for a fume pipe according to the present invention, and one side edge of the collar is is constructed by fitting a metal ring 2 that can cover its side end surface.

FIG. 2 is an explanatory view of the above-mentioned collar 1 of the present application, which is fitted onto the outer circumferential surface of a joint between two hume pipes 3, as in the case of conventional collars. Reference numeral 4 denotes a water-stopping rubber ring provided at the circumferential end of the fume tube 3, and this rubber ring 4 is tightly attached to the inner surface of the collar 1.

3 and 4 are examples showing the shape of the metal ring 2, respectively, and the ring 2 shown in FIG.
Ring a has a shape that can cover the vertical and inclined surfaces of the side end surface of the collar 1, and the ring 2b shown in FIG. 4 covers not only the vertical and inclined surfaces of the side end surface of the collar 1 but also its upper surface. It is configured in such a way that it can be done.

In the above embodiment, the ring 2 was fitted into the end face of the circumferential end of the collar 1, but as shown in FIG. It is also possible to configure the structure by embedding it in one piece, or leaving a part exposed. In this case, there is no risk of the metal ring 5 falling off from the collar 1, and furthermore, the progress of corrosion of the ring 5 can be suppressed.

In the above embodiment, when attaching the ring 2 to the collar 1, the ring 2 may be integrally molded when the collar 1 is manufactured, or it may be attached using an adhesive or the like after the collar 1 is manufactured. It may also be fixed.

In the above embodiments, the case where the metal rings 2 and 5 are provided only at the circumferential end of one side of the collar 1 has been described.
Of course, they can also be provided at both circumferential ends of the collar 1.

<Effects of the invention> Since the collar according to the invention has the structure and function described above, by using this collar, the collar itself can be completely prevented from being corroded over a long period of time. Moreover, there is no risk of the collar coming into contact with gravel in the soil or cracking due to the load during propulsion, etc., and being damaged, and furthermore, the peripheral edge of the collar is significantly strengthened by the metal ring. In addition, even if this ring becomes corroded due to long-term use, the collar can remain intact, so the water-stopping performance of the collar is not affected at all.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the collar of the present application, FIG. 2 is a cross-sectional explanatory view showing the state of use thereof, and FIGS. 3 to 5 are cross-sectional explanatory views of main parts showing embodiments. 1 is a collar; 2, 2a, 2b, and 5 are metal rings; 3 is a fume pipe; and 4 is a water stop rubber ring.

Claims (1)

[Scope of utility model registration request] 1. A collar for a fume pipe, characterized in that a metal ring is fitted and fixed to the circumferential end of a fiber-reinforced plastic collar, or a metal ring is embedded in a part of the circumferential end.