JPH0412119Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an anti-corrosion cover used for coating and preventing corrosion of port structures such as steel pipe supports, and particularly to an anti-corrosion cover with an improved filler injection port.

[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, conventional methods have been used to cover steel pipes with a corrosion-resistant cover such as FRP, and to fill and solidify mortar or concrete between the steel pipe and the cover.

In addition, in the case of existing steel pipes, since piers and floating facilities are constructed above the steel pipes, the steel pipes are covered from both sides with a semi-cylindrical cover, the bottom of the cover is sealed with a seal, and then the top of the cover is Filling material is injected from.

However, recently, corrosion prevention work has often been carried out by bringing the upper end of the cover into close contact with the lower surface of the concrete facility, making it no longer possible to attach the cover's hanging fittings or inject filler from above the cover.

For this reason, in the past, a notch was formed at the upper end of the cover and the hanging fittings were welded to the steel pipe from there, while a filler injection pipe was attached below the cover, and a mortar injection hose was connected to this pipe. ing. Furthermore, a plate material that opens at the injection pressure of the mortar is attached to the outlet of the injection pipe, and after injection, this plate material acts as a check valve to prevent the mortar from flowing back.

However, this plate material has the disadvantage that the upper end is attached to a support shaft to make it rotatable and also it is buried, which is time consuming and costly.

[Purpose of the invention] The present invention was made in view of the above circumstances, and its purpose is to provide a corrosion-proof cover for port structures that can inject mortar and prevent backflow by simply making improvements to the injection pipe. Our goal is to provide the following.

[Summary of the invention] In order to achieve the above object, the present invention includes a corrosion-resistant cover body that covers corrosion-protected areas such as steel pipe struts,
A corrosion protection cover for a port structure having a seal for sealing between the bottom of the cover body and the structure, a filler injection pipe attached below the cover body, and a drainage port provided above the cover body. The invention is characterized in that a flexible hose is connected to the outlet of the injection pipe.

With this configuration, when the hose for inserting the filling material is connected to the inlet of the injection pipe and mortar etc. is press-fitted, the flexible hose expands with the mortar pressure, filling the cover with mortar, and the seawater inside the cover is pushed up. and is discharged from the drain. Furthermore, after filling with mortar, the injection pressure disappears and the hose collapses due to the mortar pressure inside the filled cover, automatically preventing backflow of mortar.

[Embodiment of the invention] FIG. 1 is a longitudinal cross-sectional view of the anti-corrosion cover 2 of the invention actually attached to a steel pipe 1.

This anti-corrosion cover 2 is made of FRP, and is comprised of semicircular cover bodies 2A and 2B as shown in FIG. Each cover main body 2A, 2B has a connecting flange 3 formed on both side edges, and a cutout window 4 provided at the upper end thereof facing each other. Angle-shaped hanging fittings 5 are fixed to both sides of the inner surface of the notched window 4, so that an operator can weld the hanging fittings 5 to the outer surface of the steel pipe 1 through the notched window 4. 6 finally closes the cutout window 4
The cap is made of FRP.

On the other hand, the lower part of the cover bodies 2A, 2B is bent or curved inward, as seen in FIGS. 1 and 2, and a seal 7 is attached to the tip thereof. This seal 7 is the cover main body 2A, 2B
When attached to the steel pipe 1, it is pressed against the outer surface of the steel pipe 1 and seals the bottom of the cover.

Furthermore, an injection pipe 8 is attached to the lower part of one cover main body 2A so as to pass through the inside, and a mortar injection hose 9 can be connected to the inlet of the injection pipe 8 as shown in FIG. It's summery. Further, a short cloth hose 10 is connected to the outlet of the injection pipe 8, that is, to the inside of the cover. A drain port 11 is provided at the upper end of the cover body 2A, so that seawater in the cover bodies 2A and 2B can be drained.

The anti-corrosion cover 2 of this embodiment configured as described above is attached to the steel pipe 1 in the following order.

First, a steel pipe 1 is attached to a pair of cover bodies 2A and 2B.
is covered, and its upper end is brought into contact with the lower surface of the concrete 12. Next, each hanging fitting 5 (FIG. 3) is fixed to the steel pipe 1 by welding, and after the welding work is completed, the cutout window 4 is closed with a cap 6. Subsequently, the flanges 3 of each cover body 2A, 2B are accurately overlapped and connected by means such as bolts. The anti-corrosion cover 2 is now fixed to the steel pipe 1, and as can be seen from FIG. 1, seawater 13 is contained within the cover.

Next, a mortar insertion hose 9 is connected to the underwater injection pipe 8 (FIG. 2), and the mortar 14 is press-fitted into the anti-corrosion cover 2 by means such as a pump (not shown). At this time, the cloth hose 10 at the tip of the injection pipe swells due to the insertion pressure of the mortar 14, and the mortar 14 is filled upward from the bottom of the cover. Moreover, the seawater inside the cover is pushed upward by the mortar 14 and is discharged to the outside through the drain port 11 at the upper end of the cover.

Once the inside of the anti-corrosion cover 2 is filled with mortar 14,
The insertion of the mortar 14 is stopped and the hose 9 is removed from the injection pipe 8. At this time, the cloth hose 10 is
Since the internal pressure disappears and the mortar 14 is crushed by the mortar pressure within the cover, the mortar 14 will not leak from the injection pipe 8. Drain port 11 above the cover
is blocked by a cap, etc.

In the above embodiment, the cloth hose 10 is connected to the injection pipe 8, but other flexible materials such as rubber or soft resin may be used. In addition, if a slightly curved FRP board 15 is attached to the top surface of the hose 10 as shown by the imaginary line in FIG.
The hose 10 is more reliably closed. Furthermore, the hanging fitting 5 may be removed and a cradle may be attached to the underwater portion of the steel pipe 1 to support the anti-corrosion cover 2.

[Effects of the invention] As explained above, in the anti-corrosion cover of the invention, a flexible hose is connected to the outlet of the mortar injection pipe below the cover body, so after filling the cover with mortar, this hose It collapses under pressure, and has the effect of preventing backflow and leakage of mortar without the need to install a new check valve.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the installed state of the anti-corrosion cover according to the present invention, FIG. 2 is an enlarged cross-sectional view of the bottom of the cover, and FIG. 3 is a top perspective view of the anti-corrosion cover. 1... Steel pipe, 2... Anti-corrosion cover, 2A, 2B...
...Cover body, 5...Hanging metal fittings, 7...Seal,
8... Mortar injection pipe, 10... Fabric hose, 11... Drain port, 14... Mortar.

Claims (1)

[Scope of claim for utility model registration] (1) A corrosion-resistant cover body that covers areas to be protected from corrosion such as steel pipe supports, a seal that seals between the bottom of the cover body and the structure, and a seal that is attached to the bottom of the cover body. A corrosion-proofing cover for a port structure having an injected pulp filler and a drainage port provided above the cover main body, characterized in that a flexible hose is connected to the outlet of the injection pipe. anti-corrosion cover. (2) The anti-corrosion cover for a port structure according to claim 1, wherein the flexible hose is made of cloth. (3) The anti-corrosion cover for a port structure according to claim 1, wherein the flexible hose is made of rubber. (4) The anti-corrosion cover for a port structure according to claim 1, wherein the flexible hose is made of soft resin.