JPH0340917Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a corrosion-protective structure for members driven into the submerged ground, such as existing rope piles and rope sheet piles.

[Prior art]

Conventionally, as an anti-corrosion structure for members driven into the submerged ground such as rope piles and rope sheet piles, as disclosed in Japanese Patent Application Laid-Open No. 58-29916, anti-corrosion was applied as the innermost layer on the surface of the members driven into the submerged ground. In addition to providing an anti-corrosion layer consisting mainly of , a buffer material layer is provided as an intermediate layer to withstand impact, and a protective cover layer in the form of a plate or sheet made of reinforced plastic or corrosion-resistant metal is provided as the outermost layer. A two-layer anti-corrosion structure is known.

In addition, when fixing the anti-corrosion body to a cable pipe pile, there are two methods: (1) a fixing method that tightens and fixes it with a number of bolts and nuts through a flange that is integrally provided with a protective cover layer, (2) A fixing means for tightening and fixing using several bands arranged at intervals is adopted, and when fixing the three-layer anti-corrosion body to a rope sheet pile, (3) a large number of bands planted in the rope sheet pile are used. A fixing means is adopted in which the anti-corrosion body is tightened and fixed using stud bolts, and (4) a fixing means is used in which the anti-corrosion body is temporarily fixed to the rope sheet pile and then fixed with a drive pin from the outside of the anti-corrosion body.

[Problem that the invention attempts to solve]

However, in the case of the fixing means (1) and (2) above, when the distance between the bolts or tightening bands is large or the tightening force is insufficient, the gap between the anticorrosion body and the surface of the cable pipe pile is reduced. occurs, and seawater may intrude into the gaps, making it impossible to exhibit sufficient anticorrosion effects. If you reduce the distance between bolts and tightening bands,
Although it can counteract the intrusion of seawater to some extent, it increases the cost of materials and construction.

On the other hand, when driving rope sheet piles, the rope sheet piles are rarely installed as planned, and construction errors such as tilting in the front and rear directions, tilting in the left and right directions, twisting, elongation, and shrinkage occur in the rope sheet piles. The reality is that this is unavoidable, and moreover, the joint fitting part of the rope sheet pile has a complicated shape, unlike the web or flange part. For this reason, when the anti-corrosion body is fixed to the rope sheet pile wall using the fixing means (3) and (4) above, a gap is likely to be created between the anti-corrosion body and the surface of the rope sheet pile wall, and seawater may intrude into that gap. Therefore, sufficient anticorrosion effect cannot be exhibited. Also, if the spacing between stud bolts and drive pins is reduced, seawater intrusion can be prevented to some extent, but this increases material and construction costs, resulting in higher costs.

Furthermore, if unevenness occurs on the surface of rope piles and rope sheet pile walls due to corrosion, gaps will form between the recesses and the anti-corrosion material, and seawater may infiltrate into these gaps, so that sufficient corrosion protection is not achieved. cannot be expected.

[Purpose of the invention, structure]

The purpose of this invention is to provide an anti-corrosion structure for a member to be driven into the submerged ground made of rope, which can advantageously solve the above-mentioned problems. On the surface, there is a corrosion-proofing layer 2, a water-absorbing swelling material layer 3, a cushioning material layer 4, and a protective cover 5 made of a thin plate of plastic or corrosion-resistant metal.
The present invention provides an anti-corrosion structure for a member driven into the submerged ground, characterized in that: and are sequentially stacked and fixed.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

FIG. 5 and FIG. 6 show the anticorrosive cover 6 used in the embodiment of this invention,
A cushioning material layer 4 made of foamed rubber or synthetic resin foam such as foamed polyethylene is integrally provided on the inner surface of the protective cover 5 made of a thin plate of polyethylene or other plastic 7 or a thin plate of corrosion-resistant metal such as stainless steel or titanium. A urethane-based water-absorbing and swelling material layer 3 is integrally provided on the inner surface of the buffer material layer 4, and an anti-corrosion layer 2 made of petrolatum is integrally provided on the inner surface of the water-absorbing and swelling material layer 3. 2. One end of the water-absorbing swelling material layer 3, the cushioning material layer 4, and the protection bar 5 in the left-right direction are aligned so as to be located on the same plane, and the anticorrosion layer 2, the water-absorbing swelling material layer 3, and the cushioning material layer 4 The other ends of the protective cover 5 in the left and right direction are aligned so as to be located on the same plane, and the upper and lower ends of the other end of the protective cover 5 in the left and right direction are also aligned with the anticorrosion layer 2, the water absorbing and swelling material layer 3, and It is aligned so as to be located on the same plane as the other end of the cushioning material layer 4.

A presser plate 7 and a flange 8 are arranged in series at the vertically intermediate portion of the other end of the protective cover 5 in the left-right direction,
Also, at a position slightly away from one end in the left and right direction on the outer surface of the protective cover 5, one side of the stainless steel connecting fitting 9 with an L-shaped cross section extending in the vertical direction is overlaid with an adhesive, an adhesive, or a screw (not shown). (omitted)), and furthermore, a stainless steel connecting fitting 10 with an L-shaped cross section extending vertically to the presser plate 7 and flange 8 is superposed and bonded with adhesive or adhesive or screws (not shown). fixed, and each connecting fitting 9 and 1
A large number of bolt insertion holes 11 are provided on the side perpendicular to the protective cover 5 and on the flange 8 at 0.

FIGS. 1 to 4 show a corrosion-proof structure of a submerged foundation member according to an embodiment of this invention using the anti-corrosion cover 6, which supports a structure 12 such as a concrete deck slab for a pier. The anti-corrosion cover 6 is wrapped around the outer surface of the area to be protected from corrosion, including the splash zone and the tidal zone, in a rope-made underwater bottom ground driving member consisting of a rope pipe pile. A large number of bolts 13 are inserted through the bolts 10, and the anti-corrosion cover 6 is tightened by the bolts 13, so that the anti-corrosion layer 2 of the anti-corrosion cover 6 is pressed against the outer surface of the steel underwater bottom ground driving member 1. Furthermore, a tightening band 14 made of a corrosion-resistant material, for example, stainless steel, is wrapped around the outer surface of the upper and lower ends of the anti-corrosion cover 6 wrapped around the steel submerged ground driving member 1 and fixed with bolts 15.

When implementing this invention, the water-absorbing and swelling material layer 3
For example, Chemigard U is a water-absorbing and swelling material that constitutes
-1 (manufactured by Sanyo Chemical Industries KK) is used.

In addition, the protective cover 5 contains an ultraviolet deterioration inhibitor such as carbon black, and an oxidation deterioration inhibitor made of a phenolic or yellowish compound.
Polyethylene with improved durability, particularly low-density polyethylene with excellent environmental stress cracking resistance, is preferred.

The protective cover 5 has a thickness of 2 mm, for example.
A polyethylene plate or a stainless steel plate with a thickness of about 1 mm is used, and the thickness of the cushioning material layer 4 is 10 to 5 mm.
mm, thickness of water-absorbing swelling material layer 3 2-1 mm, anticorrosive layer 2
Set the thickness to 3 to 1 mm.

Since the water-absorbing and swelling material of ChemiGuard U-1 also has water-stopping properties and adhesive properties, it can prevent seawater that has penetrated through the buffer material layer 4 from penetrating into the anticorrosion layer 2, and The water-absorbing swelling material layer 3, the anticorrosion layer 2, and the buffering material layer 4 can be integrated.

As a means for tightening and fixing the anti-corrosion cover to the steel pipe pile, any means other than those shown may be employed.

When implementing this idea for corrosion protection of rope sheet pile walls,
A corrosion protection cover manufactured to have the same shape as the surface of the corrosion-protected portion of the rope sheet pile wall is fixed with a drive pin or the like in contact with the rope sheet pile wall.

[Effect of idea]

According to this invention, when the anti-corrosion cover 6 consisting of the anti-corrosion layer 2, the water-absorbing swelling material layer 3, the buffer layer 4 and the anti-corrosion cover 5 is attached to the surface of the steel submerged ground driving member 1, the anti-corrosion layer Even if there is a gap between a part of 2 and the rope-made underwater foundation driving member 1, the water-absorbing and swelling material layer 3 absorbs water in the seawater and swells.
The swelling pressure strongly presses the anti-corrosion layer 2 against the surface of the steel submersible ground driving member 1, so the anti-corrosion layer 2
It is possible to automatically eliminate the gap between the surface of the steel submerged subsurface ground driving member 1, and therefore the front surface of the anticorrosive layer 2 is adhered to the surface of the steel submerged subsurface ground driven member 1, and the steel The surface of the submerged ground driving member 1 can be reliably protected from corrosion, and since the buffer material layer 4 is interposed between the protective cover 5 and the water-absorbing swelling material layer 3, driftwood etc. collide with the protective cover 5. In this case, the impact force is buffered and dispersed by the buffer material layer 4 and transmitted to the water-absorbing and swelling material layer 3, so that the water-absorbing and swelling material layer 3 and the anticorrosion layer 2 are partially subjected to excessive impact force and pushed. Effects such as being able to eliminate the fear of being crushed can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention,
Figure 1 is a cross-sectional plan view showing the anti-corrosion structure of the submerged underground member, and Figure 2 is a partially vertical side view showing the steel submerged underground member supporting the structure with the anti-corrosion cover attached. , FIG. 3 is an enlarged side view of a part of FIG. 2, FIG. 4 is an enlarged sectional view taken along the line A-A in FIG. FIG. 6 is a sectional view taken along the line B--B in FIG. 5. In the figure, 1 is a steel submerged ground driving member, 2 is an anti-corrosion layer, 3 is a water-absorbing swelling material layer, 4 is a buffer material layer, and 5
is a protective cover, 6 is a corrosion protection cover, 8 is a flange,
9 and 10 are connecting fittings, 11 is a through hole for bolt insertion, 13 is a bolt, 14 is a tightening band, and 15 is a bolt.

Claims (1)

[Scope of utility model registration request] An anti-corrosion layer 2 is provided on the surface of the rope-made submerged foundation member 1.
This anti-corrosion structure for a member driven into the submerged ground is characterized in that a water-absorbing swelling material layer 3, a buffering material layer 4, and a protective cover 5 made of a thin plate of plastic or corrosion-resistant metal are sequentially laminated and fixed.