JPH0358412B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a connection mechanism for a split anti-corrosion cover used to coat and protect existing steel pipes such as pier supports.

[Prior art]

It is known that steel pipes such as pier supports found in ports and harbors are subject to intensive corrosion in their tidal and splash areas due to the action of macro batteries. In order to prevent this corrosion, a method has conventionally been adopted in which a steel pipe is covered with a corrosion-resistant cover such as F/R/P, and a filling material such as mortar or concrete is injected and solidified between the steel pipe and the cover.

However, in the case of an existing steel pipe, the cylindrical cover cannot be inserted into the steel pipe because concrete is built upwards. For this reason, a structure in which the cover is divided into a pair of halves, a flange extending in the longitudinal direction is formed at each end edge, and the flanges are connected to each other by facing each cover half from the outside of the steel pipe is often used. Further, as a means for connecting the flanges, there are methods using bolts and methods using a holder that holds the stacked flanges from the outside.

However, the former requires a considerable amount of time and effort to tighten a large number of bolts on site, and the latter has the disadvantage that a predetermined flange clamping force cannot be obtained when the anticorrosion cover becomes large.

In addition, there is a method of covering the steel pipe by splitting the cylindrical cover at only one place and pushing the cover apart, but the flanges of the cover must be joined after the steel pipe is covered, and in this case, the same method as described above is used. The problem arises.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a connecting mechanism for split anti-corrosion covers that allows a worker to easily connect flanges on site.

[Summary of the invention]

In order to achieve the above object, the present invention provides a male member on the inner surface of one flange of the anti-corrosion cover and a female member on the inner surface of the other flange so that both flanges can be elastically engaged. are arranged so that they overlap each other.

[Embodiments of the invention]

FIG. 1 shows an anti-corrosion cover 10 that employs the coupling mechanism of the present invention.

The anti-corrosion cover 10 is made of a corrosion-resistant material such as F.R.P, etc., and is attached to the steel pipe 12 with the cover halves 10a and 10b facing each other as shown in FIG. The vertical dimension of each cover half body 10a, 10b is set so that the ebb and flow area and the splash area of the steel pipe 12 can be completely covered.

Further, a plurality of hanging fittings 14 are fixed to the upper inner surface of the cover halves 10a, 10b, and by welding each hanging fitting 14 to the steel pipe 12, the anticorrosive cover 10 is supported in a predetermined position. Although not shown, a pedestal is installed on the steel pipe 12 and the anti-corrosion cover 1 is
A structure may be adopted in which the lower end of 0 is supported. Steel pipe 12
Concrete 16 is constructed above the bridge, forming a pier as a whole.

Flanges 18 and 19 are provided at both ends of the cover halves 10a and 10b, as shown in FIG.
After each flange 18, 19 is bent outward once,
They curve toward each other again and overlap each other.

A male member 20 is fixed to the inner surface of the flange 18, as shown enlarged in FIG.
A female member 22 is fixed to the inner surface of the member. Further, a plurality of teeth 24 are provided on the outside of the male member 20, and internal teeth 26 that engage with the teeth 24 are carved on the inner surface of the groove 28 of the female member 22. these teeth 2
4 and the internal teeth 26 are inclined, and are shaped so that they will not come out once they are in occlusion.

Preferably, the male member 20 and the female member 22 are made of a material having a certain strength and flexibility, such as glass fiber reinforced nylon 6. The longitudinal dimensions of the male member 20 and the female member 22 are approximately equal to the vertical dimensions of the flanges 18 and 19, and the groove 28 is also formed over the entire length of the female member 22.

It is preferable that the internal teeth 26 of the female member 22 be provided only on the exit side of the groove 28 (upper side in FIG. 4) so that a cavity is formed within the groove 28 even after engagement with the teeth 24. This configuration makes it easier for the female member 22 to deform and expand during occlusion with the male member 20.
Also, the male member 20, the flange 18, the female member 2
If the contact surface between 2 and the flange 19 is made as wide as possible to increase the adhesion between each member, the strength will be stabilized.

The anti-corrosion cover 10 of this embodiment is constructed in the following order. First, the steel pipe 12 is covered from the outside with the cover halves 10a and 10b facing each other, and the flanges 18 and 19 are pressed to engage the male member 20 and the female member 22. Next, the anti-corrosion cover 10
After adjusting the vertical position so as to cover the ebb and flow area and the splash area of the steel pipe 12, each hanging fitting 14 connected above the cover 10 is welded to the steel pipe 12. Finally, filler 30 (second
~See Figure 4) is injected and solidified.

Although not shown, since a predetermined annular seal is provided between the bottom of the anti-corrosion cover 10 and the steel pipe 12, there is no fear that the filler 30 will leak from below the anti-corrosion cover 10.

Further, the overlapping portions of the flanges 18 and 19 do not require any special adhesive. flange 18,
Even if seawater enters through the gap in 19, the male member 2
0 and the female member 22 provide a sufficient sealing action so that seawater does not reach the filler 36.

FIG. 3 shows a cylindrical anti-corrosion cover 10 with only one portion split. This anti-corrosion cover 10
is the steel pipe 1 with the flanges 18 and 19 pushed open.
Attached to 2. The other configurations and construction order are the same as in the previous example.

〔Effect of the invention〕

As explained above, according to the connection mechanism of the present invention, the flanges of the split type anti-corrosion cover can be reliably connected without requiring bolt tightening or a holder.

[Brief explanation of drawings]

Fig. 1 is a side view showing the installation state of a split anti-corrosion cover that employs the coupling mechanism of the present invention, Fig. 2 is a sectional view taken along the line shown in Fig. 1, and Fig. 3 shows a different type of anti-corrosion cover. FIG. 2 is a sectional view similar to FIG. 2, and FIG. 4 is an enlarged sectional view of the flange portion. 10... Anti-corrosion cover, 10a, 10b... Half cover, 12... Steel pipe, 18, 19... Flange, 20... Male member, 22... Female member, 24
...teeth, 26...internal teeth.

Claims (1)

[Claims] 1. In a connecting mechanism for a split anti-corrosion cover that is used to cover the tidal and splash areas of an existing steel pipe from the outside and forms a cylindrical shape by joining opposing flanges, a male member is attached to the inner surface of one of the flanges, A connecting mechanism for a split anti-corrosion cover, characterized in that a female member is fixed to the inner surface of the other flange so that both flanges can be elastically engaged, and the tips of both flanges are overlapped with each other.