JPH0152528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrosion protection construction method for steel pipe struts.
Steel pipe supports installed in ports, etc. are covered with corrosion-resistant covers to prevent corrosion, but if the cylindrical covers were covered in advance, the formwork support brackets for upper concrete work could not be welded to the steel pipes. It disappears. It would be physically impossible to insert the cylindrical cover after the concrete work was completed and the brackets were removed first. For this reason, in the past, split-type covers were unavoidably used, but in this case, underwater work was involved, making it difficult for on-site workers. In addition, shellfish and seaweed adhere to the steel pipes during concrete construction, so it is necessary to remove them.

The present invention has been made in view of this point,
First, a cylindrical cover that is slightly shorter than the corrosion-protected area is attached to the steel pipe, and after the concrete work is completed, the remaining steel pipe portion is covered with a split cover.
The above problem was solved. Since the underwater portion of the steel pipe is already coated, shellfish and seaweed will not adhere to it, and underwater work will not be necessary. Of course, since the steel pipe section is exposed above the cylindrical cover, the formwork support bracket can be welded to this section. Embodiments of the construction method of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a front view showing a state in which a cylindrical cover 2 is covered with a steel pipe support 1. Although the steel pipe 1 in the figure is inclined, the construction method of the present invention can of course also be used for vertical steel pipes. The cover 2 is made of F.R.P, its dimensions are formed slightly shorter than the required corrosion protection area, and it is installed so that the steel pipe surface can be seen between the lower surface of the upper concrete 3 and the cylindrical cover 2. The cylindrical cover 2 is installed using conventional means such as hanging hardware or bottom support, and filler is injected into the cover. Next, the bracket 4 is welded to the upper steel pipe surface, and the H steel 5 and formwork 6 are welded.
Place. For convenience of drawing, only one bracket 4 is shown and the others are omitted. After constructing the upper concrete as shown by the imaginary line 3, the bracket 4, H steel 5 and formwork 6 are removed.

Next, as shown in FIG. 2, the remaining steel pipe portions are covered with split covers 7, 7, and the respective flanges 8, 8 are fixed. A cross-sectional view taken along the - line is shown in FIG.
It is desirable to use a seal 9 to secure the flanges 8, 8 together. If the steel pipe 1 is inclined as shown in FIG. 2, the covers 7, 7 are divided at symmetrical positions. In this way, the cover 7 can be manufactured easily. Alternatively, the split type cover may be split at only one location and then spread to cover the steel pipe 1, as shown in FIG. In this case as well, a seal 9' is interposed at the joint portion 8' of the cover 7'. Although not shown in the figure, the split covers 7, 7' are fixed to the steel pipe 1 using known metal fittings. The cylindrical cover 2 and the split cover 7 are connected via a seal, if necessary.
The reason why a gap is provided between the concrete 3 and the cover 7 in FIG. 2 is to inject the filler 10. After the filler is injected, the gap is filled with a highly viscous filler 11 such as epoxy mortar. Alternatively, an injection port may be provided in the cover 7 and closed after the filler is injected.

As described above, according to the present invention, there is no need for underwater work, no need to remove oysters from shellfish and seaweed, and welding of brackets can be carried out without any problems, so the efficiency of corrosion prevention work can be greatly improved.

[Brief explanation of drawings]

Figure 1 is a front view showing the inserted state of the cylindrical cover, Figure 2 is a front view after the corrosion protection work is completed, Figure 3 is a sectional view taken along the line shown in Figure 2, and Figure 4 shows other split types. FIG. 1...Steel pipe support, 2...Cylindrical corrosion-resistant cover, 3
...Top concrete, 4...Bracket, 7,
7'...Divided corrosion-resistant cover, 10...Filler, 1
1... Highly viscous filler.

Claims (1)

[Scope of Claims] 1. After covering the steel pipe support with a cylindrical corrosion-resistant cover that is slightly shorter than the corrosion-protected area and injecting filler into the inside, and completing the concrete work on the upper part of the steel pipe, the steel pipe between the cylindrical cover and the concrete is covered. A method for corrosion-proofing steel pipe struts, which comprises covering the part with a split-type corrosion-proofing cover and injecting a filler into the cover as well. 2 The split type corrosion-resistant cover has a semicircular cross section.
The corrosion prevention construction method according to claim 1, which is a split type. 3. The corrosion protection method according to claim 1, wherein the split type corrosion protection cover is of a type that can be covered by splitting one part of the cylindrical cover and spreading it out.