JPH0340925Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to 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 existing steel pipes, concrete has been constructed above them, so it is not possible to insert a cylindrical cover. For this reason, a structure is often used in which the anti-corrosion cover is divided into a pair of halves, a flange extending in the longitudinal direction is formed on each end edge, and the flanges are connected with both cover halves facing each other from the outside of the steel pipe. .

However, since this type of flange is formed by extending a thin anti-corrosion cover, the flange tends to lack rigidity. If only the flange is made thick, there is a drawback that the formation cost and labor increase. Furthermore, since the flange protrudes to the outside of the anti-corrosion cover, there is a possibility that it will be damaged by large external forces such as driftwood or waves.

In addition, there is a type in which the steel pipe is covered by splitting only one part of the cylindrical cover and pushing the cover apart, but since the flange is connected after the steel pipe is covered, the same problem as described above occurs in this case as well.

[Purpose of invention]

The present invention was devised in view of the above circumstances, and its purpose is to provide a split anti-corrosion cover that can increase the rigidity of the flange portion.

[Summary of the idea]

In order to achieve the above object, the present invention is configured to increase the rigidity of the flange portion by interposing a square piece or a square pipe between the two flanges to be connected.

[Example of idea]

FIG. 1 shows a split anti-corrosion cover 10 to which the present invention is applied.

The corrosion-resistant cover 10 is made of a corrosion-resistant material such as F, R, or P, and is composed of a pair of semicircular cover halves 10a and 10b, as shown in FIG. The longitudinal dimension of each cover half 10a, 10b is set so that the ebb and flow area and the splash area of the steel pipe 12 can be sufficiently covered.

A plurality of hanging fittings 14 are connected to the upper inner surface of the cover halves 10a and 10b, and each hanging fitting 1
By welding 4 to the steel pipe 12, the anti-corrosion cover 10 is supported in a predetermined position. Although not shown,
A pedestal may be installed in the underwater portion of the steel pipe 12 to support the lower end of the anti-corrosion cover 10. Concrete 16 is constructed above the steel pipe 12, and the whole constitutes one pier.

As shown in FIG. 2, flanges 18a and 18b are provided at both ends of the cover halves 10a and 10b, and each flange 18a and 18b is once bent outward and then bent again in the approach direction.

A rigid member 20 is inserted inside each of the flanges 18a and 18b, as shown in an enlarged view in FIG. The rigid member 20 has a rectangular cross section, and its longitudinal dimension is approximately equal to the vertical dimension of the flanges 18a and 18b. Rigid member 20 in this embodiment
Square timber is used for this, but other square pipes, hard rubber, etc. can also be used. The rigid member 20 serves to increase the rigidity of the thin flange portion, and also prevents the flanges 18a, 18b from being damaged by external force to some extent.

Both flanges 18 with the rigid member 20 interposed
a and 18b are connected by a bolt 22 and a nut 24. When using a square timber or a square pipe as the rigid member 20, a seal 26 is used between the rigid members 20.
It is desirable to intervene. If an elastic material is used for the rigid member 20, these seals 26 are not necessary. The rigid member 20 is attached to the flange 18 on site.
Although it may be inserted between cover halves 10a and 18b, it is convenient for construction if it is fixed to cover halves 10a and 10b in advance.

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, the seal 26 is interposed between the rigid members 20, and the flanges 18 and 19 are connected by bolts 22 and nuts 24. The bolts 22 are fixed to the flange 18 in advance,
It is desirable to simply tighten the nut 24 after the flanges 18a, 18b are overlapped. Furthermore, the bolts 22 and nuts 24 are made of corrosion-resistant materials.

Next, after adjusting the vertical position so that the anti-corrosion cover 10 completely covers the ebb and flow area and the splash area of the steel pipe 12,
Each hanging fitting 14 above the cover is welded to the steel pipe 12. Finally, the filler 28 is injected into the anti-corrosion cover 10 and the steel pipe 12 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 28 will leak from below the anti-corrosion cover 10.

FIG. 3 shows a cylindrical anti-corrosion cover 10 with only one portion split. This anti-corrosion cover 10
The flanges 18a and 18b are once pushed open and attached to the steel pipe 12, and the other configurations are almost the same as the previous embodiment.

[Effect of idea]

As explained above, according to the split anti-corrosion cover of the present invention, the rigidity of the flange portion can be easily increased with a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the installed state of the split anti-corrosion cover according to the present invention, Fig. 2 is a sectional view along the line shown in Fig. 1, and Fig. 3 is similar to Fig. 2 showing a different type of anti-corrosion cover. FIG. 4 is an enlarged sectional view of the flange portion. 10... Corrosion protection cover, 10a, 10b... Cover half, 12... Steel pipe, 18a, 18b... Flange, 20... Rigid member, 22... Bolt, 24
...Natsuto, 28...Filling material.

Claims (1)

[Claims for Utility Model Registration] (1) In a split corrosion protection cover that is used to cover the tidal and splash areas of an existing steel pipe from the outside and that forms a cylindrical shape by connecting opposing flanges, both the flanges A split anti-corrosion cover characterized by having a rigid member interposed therebetween. (2) The split-type anti-corrosion cover according to claim (1), wherein the rigid member is a square timber. (3) The split anti-corrosion cover according to claim 1, wherein the rigid member is a square pipe. (4) The split-type anti-corrosion cover according to claim 1, wherein the rigid member is made of angular hard rubber.