JPH042215Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an airtight anti-corrosion cover for the legs of marine and floating structures that are constructed or floated in the ocean, rivers, lakes, etc.

As shown in a side view in part in FIG. 1, the boundary part exposed to water 1 and air 2, that is, the part that faces the water and air due to changes in water level,
The parts of the legs 3, such as legs and stakes, near the water surface, which are constantly exposed to waves and splashes, corrode.

Therefore, the steel pipe pile 3 as the leg has a second
As shown in the horizontal cross-sectional view in the figure, anticorrosion paint or petrolatum paste is applied to the area near the water surface.
It was covered with an anti-corrosion coating material 4 such as petrolatum paste tape, and covered with a protective cover 5 made of plastic such as FRV or FRP to protect it.

However, the protective cover 5 has flanges 6, 6 at its ends.
Since the flanges 6 and 6 are connected by a plurality of bolts 7 and nuts 8, if the bolts 7 and nuts 8 corrode, they will come off.

If the protective cover 5 comes off or loosens,
The anti-corrosion coating 4 is exposed, and the anti-corrosion coating 4, which itself is easily damaged, is immediately damaged and the steel pipe pile 3 corrodes.

Furthermore, as shown in the horizontal sectional view in Figure 3,
A flange 6 attached to the outer surface of the end of the protective cover 5,
6 is in the tightened position, if the structure has a gap a, the flanges 6, 6 will not be able to maintain parallelism due to the tightening of the bolt 7 and nut 8, and floating will occur near the end of the protective cover 5. , gaps 9, 9 are created between the anti-corrosion coating material 4 and the protective cover 5, and the anti-corrosion coating material 4 is exposed to water and loses its anti-corrosion effect in a short period of time.

Based on the above-mentioned points of view, this idea was developed to completely seal the surface of the legs, which are anti-corrosive bodies, without using bolts or nuts, and to enable semi-permanent corrosion protection for the legs of marine and floating structures. The cover is a thermoplastic sheet that can be wrapped around the outer surface of the leg body, and the entire length of the overlapping portion is attached to one or both of the overlapped end portions. A plurality of parallel grooves are provided along the edge, and heating wires for heat welding are sequentially embedded in the grooves, so that the upper and lower ends are brought into close contact with the leg body, and the overlapped parts are brought into close contact. The present invention is characterized in that a voltage is applied to the heating wire in a state in which the overlapping portions are thermally welded, thereby completely sealing a required portion of the leg body.

Next, the hermetic anti-corrosion cover for the legs of marine and floating structures of this invention will be described by way of example with reference to the drawings.

FIG. 4 shows a partially cutaway perspective view of an embodiment of the cover of this invention, and FIG. 5 shows a perspective view of the cover being attached to a leg. As shown in the drawing,
The cover 10 of this invention has steel pipe piles 3 as legs.
Thickness: 4.6mm thermoplastic with a width that allows it to be wrapped so that the left and right ends overlap, and a length that covers the steel pipe pile 3 in the range of the highest water level where it is sprayed from slightly below the lowest water level 1A. It is a plastic sheet, and in this embodiment, out of the overlapping end portions 10A and 10B, in this embodiment, the groove 1 provided on the surface of the overlapping end portion 10A, which is the inner side when overlapped.
A heating wire 11 for heat welding is embedded in 2.

The heating wire 11 has a plurality of grooves 12 (six grooves in this embodiment) parallel to the edge 10a on the surface of the overlapping end portion 10A over the entire length of the overlapping end portion. are cut into the grooves 12, and the terminals 1 formed at the ends are sequentially embedded in these grooves 12.
1A and 11B can be freely connected to a power source.

In this embodiment, the heating wire 11 is connected to the overlapped end portion 1.
Although it is embedded in 0A, this is the end overlap part 1
A groove may be provided on the back surface of 0B and embedded therein, or it may be embedded in both of the overlapping end portions 10A and 10B.

In addition, the number of turns of the heating wire 11 is generally 5 to 5.
The number of turns is 6 turns, but the number can be determined as required for the design, and since the heating wire 11 can be embedded in a groove at the work site, the number of turns of the heating wire can be adjusted depending on the situation at the work site. It is economical because it can also be changed and the use of unnecessary heating wires can be limited.

When wrapping the cover 10 of this invention around the steel pipe pile 3, which is an example of a leg body, sealing materials 13, 13 to be bonded to the upper and lower ends of the cover 10 are attached as shown in a perspective view of an example in FIG. It is attached to the steel pipe pile 3 in advance, and furthermore, an inhibitor 14 or a zinc foil 15 with a conductive adhesive having galvanic anode performance is affixed to a required portion between the two sealing materials 13, 13.

The sealing materials 13, 13 are waterproof double-sided adhesive tapes, and in this example, those having a thickness of 1.5 mm and a width of 300 mm were used.

Furthermore, although the inhibitor 14 is a flat plate-like vaporizable solid inhibitor in this embodiment, a liquid inhibitor may also be used.

Zinc foil 15 having a thickness of 0.1 mm and a width of 50 mm was used, and was wrapped around the steel pipe pile 3 with a width of approximately 300 mm in the axial direction.

The inhibitor 14 and the zinc foil 15 are placed in a sealed space surrounded by the sealing materials 13 and 13 and the cover 10 of this invention when the cover 10 of this invention is attached to a leg (for example, a steel pipe pile 3). The cover 10 is used to convert small amounts of existing seawater, fresh water, moisture in the air, etc. into non-corrosive liquid, so attach the cover 10 to the leg body in a completely dry atmosphere to seal the surface of the leg body. Not necessarily necessary if possible.

The band 16 in FIG. 5 is a steel band that is tightened when the cover 10 of this invention is wrapped around the steel pipe pile 3, which is an example of a leg, and the band is held in the wrapped state until the heat welding is completed. However, there is no need to remove it after heat welding.

The cover 10 of this invention, which has the above-mentioned configuration, has the following features:
Seal materials 13, 13, and if necessary, an inhibitor 14, zinc foil 15, etc. are attached to the steel pipe pile 3 as a leg body, and then wrapped, and the end overlapped portions 10A, 10B are wrapped.
3 to 4 layers on top and bottom using band 16.
After tightening the parts, connect the power supply (AC: 200V) to the terminals 11A and 11B, apply voltage for about 3 minutes, and use a pressing tool such as a porcelain roller (not shown) to tighten the ends. Push the outer surface of the overlapped portion 10B in the length direction to remove the end overlapped portion 10.
Completely heat weld A and 10B.

The cover of this invention, which completely seals the surface of the required portion of the steel pipe pile 3 in this way, completely eliminates water and oxygen that are corrosion factors, and semi-permanently protects the steel pipe pile 3 from corrosion.

As is clear from the above explanation, unlike temporary corrosion prevention measures such as conventional painting or pasting of petrolatum tape, the cover of this invention completely seals the easily corroded parts of the legs and is semi-permanent. It has excellent advantages such as being corrosion resistant and easy to handle.

[Brief explanation of the drawing]

Figure 1 is a side view showing a part of the structure to be protected against corrosion and a conventional corrosion protection structure, Figures 2 and 3 are horizontal sectional views showing examples of each of the conventional corrosion protection structures, and Figure 4 is the proposed invention. FIG. 5 is a perspective view with a part cut away showing an embodiment of the cover, FIG. 5 is a perspective view showing the state in use, and FIG. FIG. In the drawing, 1...water, 2...air, 3...
Steel pipe piles as legs, 10...cover of this invention, 10A, 10B... end overlapping parts, 11...
... Heating wire, 11A, 11B ... Terminal, 12 ... Groove, 13 ... Seal material, 14 ... Inhibitor, 1
5...Zinc foil, 16...Band.

Claims (1)

[Scope of utility model registration request] A thermoplastic sheet that can be freely wrapped around the outer circumferential surface of the leg body, and that is attached to one or both of the overlapped end portions, and extends parallel to the edge over the entire length of the overlapped portion. A hermetic anti-corrosion cover for legs of marine and floating structures, which is provided with a plurality of grooves, and heating wires for heat welding are sequentially embedded in the grooves.