JPS61158531A - Coupling mechanism of split type corrosionproof cover - Google Patents

Abstract

PURPOSE:To simply couple flanges at a site, by a method wherein a male member is secured to the one flange and a female member to the other flange to form the 2 flanges which are resiliently engageable with each other, and the forward ends of the 2 flanges are superposed with each other. CONSTITUTION:A corrosionproof cover 10 is formed by a corrosion resistant material, such as F.R.P., and cover half bodies 10a and 10b are mounted to a steel pipe 12 in a state that they are positioned facing each other. Flanges 18 and 19 are located to both ends of the cover half bodies 10a and 10b. After the flanges are bent outward one, they are bent in a direction in which they approach each other, and they are superposed with each other. A male member 20 is secured to the inner surface of the flange 18, a female member 22 to the inner surface of the flange 19, and they are formed such that, once they are engaged with each other, they are prevented from disengagement. This enables reliable coupling of the flanges of a split type corrosionproof cover without tightening of bolts or needing holder.

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 protect installed 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, concrete is built upwards, so it is not possible to insert a cylindrical cover into the steel pipe. For this reason, a structure is often used 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. Further, as means for connecting the flanges, there are two methods: bolt tightening, and a method using a holder that clamps 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 breaking only one part of the cylindrical cover and pushing the cover apart, but the flange of the cover must be joined after the steel pipe is covered.
In this case as well, the same problem as described above occurs.

[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.

[Outline of invention cost]

In order to achieve the above object, in the present invention, a conical S-shaped member is provided on the inner surface of one flange of the anti-corrosion cover, and a male member is provided on the inner surface of the other flange so that both flanges can be elastically engaged. The tips of the two are overlapped with 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, and as can be seen from FIG.
It is attached to the steel pipe 12 with the 0b facing each other. The vertical dimension of each half cover IQa, 10b is set so as to completely cover the ebb and flow area and the splash area of the steel pipe 12.

In addition, on the upper inner surface of the cover half-closed parts 10a and 10b,
A plurality of hanging fittings 14 are fixed, and by welding each hanging fitting 14 to the steel pipe 12, the anticorrosion cover 10 is supported in a predetermined position. Although not shown, a pedestal may be installed on the steel pipe 12 to support the lower end of the anti-corrosion cover 10. Concrete 16 is constructed above the steel pipe 12, forming a pier as a whole.

At both ends of the cover halves 10 & 10b, flanges 18 and 19 are provided as shown in FIG. has been done.

A male member 2( ) is fixed to the inner surface of the flange 18, as shown enlarged in FIG. 4, and a male member 22 is fixed to the inner surface of the flange 19. Further, a plurality of teeth z4 are provided on the outside of the male member 20, and internal teeth 26 that engage with tooth teeth are carved on the grooved inner surface of the male member 22. These teeth 24 and internal teeth 26 are inclined and have a shape that prevents them from coming out once they are in occlusion.

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

It is desirable that the internal teeth 26 of the male member 22 be provided only on the exit side of the groove (upper side in FIG. 4) so that a cavity is formed within the groove even after the teeth 24 are engaged with each other. This configuration makes it easier for the male member 22 to deform and expand during occlusion with the male member 20. Furthermore, the strength can be stabilized by making the contact surfaces between the male member 20 and the flange 18 and between the male member 22 and the flange 19 as wide as possible to increase the adhesion between each member.

The anticorrosive 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 male member 22. Next, after adjusting the vertical position of the anti-corrosion cover 10 so as to cover the ebb and flow area and the splash area of the steel pipe 12, each of the hanging fittings 14 connected to the upper part of the cover 10 is welded to the steel pipe 12. Finally, a filler 30 (see FIGS. 2 to 4) is injected between the anticorrosive cover 10 and the steel pipe 12 and solidified.

Although not shown, the bottom of the anti-corrosion cover 10 and the steel pipe 12
Since a predetermined annular seal is provided between the anti-corrosion cover 10 and the anti-corrosion cover 10, 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. Even if seawater enters through the gap between the flanges 18 and 19, the male member 20 and the male member 22
provides a sufficient sealing action, so seawater will not reach the filler 36.

Figure 3 shows corrosion protection cover 1 with only one part of the cylindrical shape broken.
0 is shown. This anti-corrosion cover 10 has a flange 18
, 19 are pushed open and attached to the steel pipe 12.

The other configurations and construction order are the same as in the previous example.

1. Effects of the Invention] As explained above, according to the connection mechanism of the present invention, the flanges of the split anti-corrosion cover can be reliably connected without the need for bolt tightening or holders.

[Brief explanation of the drawing]

Figure 1 is a side view showing the installed state of a split type anti-corrosion cover that employs the coupling mechanism of the present invention, Figure 2 is a sectional view taken along line ■-■ in Figure 1, and Figure 3 is a different type of corrosion protection. A sectional view similar to FIG. 2 showing the cover, and FIG. 4 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 Male member 24 Teeth 26 Internal tooth patent applicant Daito Kogyo Co., Ltd. Figure 1'-16 Figure 2 3 figure

Claims (1)

[Claims] 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 connecting opposing flanges, a male member is attached to the inner surface of one of the flanges, and a male member is attached to the inner surface of the other flange. A connecting mechanism for a split anti-corrosion cover, characterized in that a female member is fixed to the inner surface of the flange so that both flanges can be elastically engaged, and the tips of the flanges are overlapped with each other.