JPS5853138B2 - Metal columnar body with anti-corrosion coating structure - Google Patents

Description

Detailed Description of the Invention This invention relates to steel pipes, H-shaped steel, L-shaped steel, and other metal columnar bodies such as sheet piles that are driven into coasts and river banks, which are used as supports and reinforcing materials for floating facilities such as piers and bridges. In particular, the present invention relates to a metal columnar body having excellent anti-corrosion performance for such uses.

This type of columnar body is constantly washed by water currents and waves, and near the water level there is constant contact between seawater and air, so it is likely to suffer corrosion and damage during long-term use.

Conventionally, various measures have been proposed to prevent such corrosion damage.One of them is to apply a corrosion-proofing layer such as a petrolatum-based material to the parts of the columnar body that are particularly prone to corrosion, and to protect this corrosion-proofing layer with a fiber-reinforced plastic board or the like. A method of covering with a cover is known.

The above-mentioned protective cover prevents the corrosion protection layer from being torn or damaged when subjected to external impact or pressure, and also prevents the corrosion protection components from leaching into the water by blocking direct contact between the corrosion protection layer and water. Used to deter.

In order to further enhance this function, a buffer such as a foam may be interposed between the anticorrosive layer and the protective cover.

When the protective cover is tightened and fixed from the outside, the buffer fills the gap between the anticorrosive layer and the protective cover due to its buffering effect, contributing to improved adhesion.

By the way, when covering the anti-corrosion layer with such a protective cover, an appropriate means is required to tighten and fix the protective cover. Alternatively, if the ends of the protective cover placed around the entire circumference of the pillar are butted together and this mating part is tightened with bolts, the tightening force will be insufficient, especially when the anti-corrosion layer is made of petrolatum. If the material is constantly sticky, there is a risk that the protective cover or buffer may slide downward over time.

Moreover, these methods are not suitable for on-site work such as on offshore structures with poor footing, and they are not free from drawbacks such as tightening bolts and nuts, which can cause tools to fall into the sea or hinder the smooth progress of work.

The object of the present invention is primarily to provide a metal column having a specific anti-corrosion coating structure in which such drawbacks are avoided.

This invention will be explained below with reference to the drawings.

First, in Fig. 1, 1 is a concrete IJ-concrete offshore pier, 2 is a steel pipe column as a support for the pier 1, and 3 is a splash zone in the column 2, where both seawater and air can flow without interruption. This is an anti-corrosion coating provided on the contact area.

In FIGS. 2 and 3, the structure of the anti-corrosion coating 3 is such that an anti-corrosion layer 4 is closely formed on the outer peripheral surface of the tubular columnar body 2, and a plurality of screw bodies 5 are formed on the anti-corrosion layer 4. A rectangular plate-like body 6 (6A, 6B) is provided.

The anti-corrosion layer 4 is composed of a primer layer and an anti-corrosion tape placed on this layer, and these are preferably made of petrolatum as a main ingredient and have a strong anti-corrosion effect.

γ (7A, 7B) is a protective cover made of a glass fiber-reinforced plastic board, and the plastic board is hardened by impregnating glass cloth with a thermosetting resin composition in order to impart heat-formable properties to it. It consists of what was made.

Here, the thickness of the glass cloth (if two or more sheets are stacked together, the total thickness) is usually 0.5 mm or more,
Practically, a thickness of about 0.7 to 4 mm is used.

Moreover, as the thermosetting resin composition, an epoxy resin composition is suitable, and the epoxy resin has a molecular weight of 300 to 3,000. Preferably, 400 to 1,500 epoxy resin is mixed with various additives such as inorganic fillers, pigments, anticorrosion pigments, and silane coupling agents in the total amount of various curing agents or curing accelerators. Use what you have.

Since this composition is usually a highly viscous or solid agent, it is impregnated into a glass cloth as a solution in an organic solvent such as methyl ethyl ketone so that the amount of resin impregnated is about 40 to 70 weight φ.

The glass fiber reinforced plastic board obtained by curing in a heating furnace after impregnation generally has a thickness of 0.7 mm or more, in practice it is about 0.9 to 3 mm, and the thickness is usually 180 to 230 degrees Celsius or higher. It can be easily heat-formed by heating to about 0.degree. C., has practical mechanical strength under normal conditions, and has appropriate flexibility.

8 (8A, 8B) is the protective cover 7 (γA) made of the above-mentioned heat-formable glass fiber reinforced plastic board.

7B) Free-standing foam, rubber, or other elastic cushioning material with a thickness of usually 15 to 50 mrtej 9
This is a composite formed by laminating (9A, 9B) using an adhesive or adhesive.

This composite body 8 (8A, 8B) is cut into an appropriate size as a wide wound body 10 having a width of about 0.7 to 1.5 m as shown in FIG. 4, and then reinforced with glass fibers. It is made by heating the plastic plate from the side and processing it into a semicircular shape along the outer circumferential surface of the support column 2.

11 (11A. 11B) is the above complex 8 (8A, 8B
), through which the screw body 5 implanted in the rectangular plate-like body 6 (6A, 6B) on the anti-corrosion layer 4 passes.

Such a composite body 8 (8A, 8B) is arranged in a cylindrical shape around the outer periphery of the anti-corrosion layer 4 and the rectangular plate-like body 5 so as to have two overlapping parts in the longitudinal direction of the support column 2. The through hole 11 (II
A, 11B) is passed through the screw body 5, and its tip is attached to the composite body 8 (8A).

8B) to protrude outward.

12 is screwed onto the above-mentioned protruding screw body to form the composite body 8 (8A
, 8B) is a fixed tightening member, and this member 1
2 is the illustrated nut and its complex 8 (8A).

8B) and may be intercepted by a connecting plate (not shown) having a through hole in which each screw body 5 is fitted.

After the above-mentioned tightening and fixing, a sealing material is usually provided on the periphery (upper and lower edges), the overlapping part, the perforated part, etc. of the composite body 8 (8A, 8B) to form the anticorrosion coating 3.

As the sealing material used here, an underwater curable epoxy resin composition is generally suitable, and the sealing is performed by means such as a wet band method.

According to the above embodiment, the rectangular plate-like body 6 (6A).

6B) and the screw body 5 implanted in the composite body 8 (8A).

The composite body 8 (8A, 8B) can be easily fixed by penetrating each through hole 11 (11A, 11B) of 8B) and screwing the tightening member 12 onto the tip protrusion and tightening. The tightening process is easier than the fixing process, and since the screws are tightened toward the outer circumferential surface of the columnar body 2, the tightening force can be increased. 8B) can be effectively prevented from slipping downward.

Furthermore, in order to achieve the above effect, it is necessary to provide a stopper 13 on the outer peripheral surface of the columnar body 2 in advance so that the composite body 8 (8A, 8B) partially bites into the stopper 13 when tightening and fixing. .

According to this, even if the external impact is extremely severe, the composite body of the rectangular plate-like body 6 (6A, 6B) which is pressed between the anti-corrosion layer 4 and the composite body 8 (8A, 8B). It is possible to prevent the integral displacement of the

Such a stopper 13 may be formed in an annular shape on the outer peripheral surface of the support column 2.

Further, the stopper 13 may be provided on the outer surface of the columnar body 2 in the form of annular or intermittent protrusions, raised stripes, etc. below the anticorrosion layer (portion indicated by S in the figure).

On the other hand, the composite body 8 (8A, 8B) has a protective cover 7 (γA) made of a glass fiber reinforced plastic board.

7B) and the buffer bodies 9 (9A, 9B), the coating work is easier than when both are separately provided and coated on the outer periphery of the anticorrosion layer 4.
A buffer body 9 (
9A and 9B) give good results in terms of their original functions and greatly contribute to improving the adhesion between the anticorrosive layer 4 and the protective cover 1.

Furthermore, since the glass fiber-reinforced plastic plates constituting the protective covers 1 (γA, γB) in such composites 8 (8A, 8B) are made of heat-formable material, they can be made into the required shape and dimensions at the factory. A wide plate-shaped body can be transported to the construction site and a protective cover with a shape and dimensions suitable for the covering structure can be manufactured without having to use band lay-up molding to cover the anti-corrosion layer more accurately. This provides advantages such as ease of transportation from the factory to the site.

In particular, due to the flexibility of the above-mentioned plate-like body, the above-mentioned characteristics are more effectively exhibited when the above-mentioned plate-like body is transported as a rolled body 10 as shown in FIG.

In addition, in the above example, two composite bodies 8 (8A) are used.

8B) and is coated on the outer periphery of the anti-corrosion layer 4 and the rectangular plate-shaped body 6 so as to have two overlapping parts, but in some cases, one sheet of the composite 8 may be used to provide anti-corrosion protection. The layer 4 and the rectangular plate-like body 6 may be arranged and coated so that the outer periphery of the columnar body 2 has one overlapping part in the longitudinal direction,
Further, when the anti-corrosion coating portion becomes considerably long in the longitudinal direction of the columnar body 2, it is also possible to arrange the coating so that the upper and lower ends of one set of composite bodies 8 are overlapped with another composite body 8.

Furthermore, depending on the shape of the anti-corrosion coating part, a buffer may not be necessary, so in such cases, in each of the above embodiments, only a protective cover made of glass fiber reinforced plastic board is provided in the same manner as above, without using a composite. Just cover it.

In this case, the same effects as in the above-mentioned embodiments can be obtained, except for the above-mentioned effects that can only be achieved by forming a composite body.

Next, FIGS. 5 and 6 show the anti-corrosion coating structure of metal columnar bodies such as H-beam steel and L-beam steel, and these columnar bodies can be used, for example, between the two steel pipe columnar bodies shown in FIG. When used as a reinforcing plate for connecting two parts, it is desirable to coat the entire outer circumference with anti-corrosion coating.

The covering structure is the same as described above, and the same parts as in FIGS. 2 and 3 are given the same numbers.

In FIG. 5, two composite bodies 8 are used and there are two overlapping parts in the longitudinal direction of the H-beam 14, and in FIG. The anticorrosion layer 4 and the rectangular plate-like body 6 are respectively disposed in a rectangular tube shape on the outer periphery so as to have one overlapping portion in the direction.

In this arrangement as well, the thermal formability of the glass fiber reinforced plastic board can be utilized.

A rectangular plate-like body 6 (6A, 6B) with a screw body 5 implanted therein is disposed on the anticorrosive layer 4 at each of the above-mentioned mating portions, and the tip of the screw body 5 is drilled into the composite body 8. The composite body 8 is tightened and fixed by a tightening member 12 which extends through each of the provided through holes 11 and is screwed onto the external force of the composite body 8, and also by the auxiliary effect of a stopper 13.

Reference numeral 16 denotes an elastic member made of closed-cell foam, rubber, or other materials, which makes it possible to substantially arrange the composite body 8 in a rectangular cylindrical shape. It has the following functions.

Further, Fig. 7 shows the state in which steel sheet piles are driven into a river verge, and the outer surface 18 of the sheet pile 11 that is exposed to river water is the surface to be coated with anti-corrosion coating, and this surface is coated with the same anti-corrosion coating as described above. It is formed.

That is, as shown in FIG. 8, a rectangular plate-like body 6 in which a screw body 5 is implanted is disposed on the anti-corrosion layer 4 formed in close contact with the outer surface 18, and the anti-corrosion layer 4 and the plate-like body are A composite body 8 covering the body 6 is provided, and a tightening member 12 is screwed onto the threaded body 5 which protrudes outward from the composite body 8 through a through hole of the composite body 8, and with the help of a stopper 13. The composite body 8 is then tightened and fixed.

In this case, the stopper 13 is provided below the anticorrosion layer 4 .

In the above case, a predetermined number of composite bodies 8 are arranged so as to have an overlapping part in the longitudinal direction of the sheet pile 1γ, but the through holes provided in this composite body 8 are not limited to the position of the overlapping part, Tightening can be performed at any location where a large force can be applied, and a rectangular plate-like body 6 having a threaded body 5 inserted therein is also disposed at the same position.

As described in detail above, the present invention involves implanting a threaded body on an anti-corrosion layer consisting of a single layer of primer closely formed on the outer peripheral surface of a metal columnar body provided with a stopper and an anti-corrosion tape replaced on this layer. A protective cover made of a glass fiber-reinforced plastic plate in which a through hole for the threaded body is formed covers the anti-corrosion layer and the rectangular plate-like body. Also, as a good or bad thing, it is provided with a buffer interposed between the anticorrosive layer and the plate-like body, and the through hole is passed through the protective cover (if a buffer is interposed, this and the protective cover The tightening of the protective cover (or this and the protective cover if a buffer is interposed) is fixed by the screw body projecting outward (with the screw body), the tightening member screwed thereon, and the stopper. According to this, the tightening force of the protective cover becomes large and it is possible to prevent the cover (or this and the buffer body) from slipping downward over time, while also preventing corrosion. Effects such as extremely easy coating work can be obtained.

In addition, the above-mentioned effect becomes more pronounced by using a specific material that can be heat-formed as the glass fiber-reinforced plastic board, or by laminating a buffer material thereon, which improves the anti-corrosion performance and the anti-corrosion work. Improvements can be made.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the state of a steel pipe column as a support for a marine pier, Figure 2 is an exploded perspective view showing the anti-corrosion coating structure of the column, and Figure 3 is an illustration of the anti-corrosion coating structure of the column. 4 is a perspective view of a rolled body made of a composite of a glass fiber-reinforced plastic plate and a buffer, and FIGS. 5 and 6 are views of H-shaped steel and L-shaped steel, respectively. FIG. 7 is a cross-sectional view showing the corrosion-proof coating structure, FIG. 7 is a perspective view showing the state of the steel arrow pile driven into the river verge, and FIG. 8 is a cross-sectional view showing the corrosion-proof coating structure of the sheet pile. 2.14, 15, 17... Metal columnar body, 4.
...Anti-corrosion layer, 5...Screw body, 6 (6A,
6B)... Rectangular plate-like body, 1 (γA, γB)...
...Glass fiber reinforced plastic board (protective cover)
, 8 (8A. 8B)...Composite of glass fiber reinforced plastic board and buffer, 9 (9A, 9B)...Buffer, 11 (IIA, IIB)... ...through hole, 1
2...Tightening member, 13...Stopper.

Claims (1)

[Scope of Claims] 1. An anti-corrosion layer formed in close contact with the outer peripheral surface of a metal columnar body provided with a stopper and consisting of a single layer of primer and an anti-corrosion tape replaced on this layer; A rectangular plate-like body with a screw body embedded therein is disposed, while a protective cover made of a glass fiber-reinforced plastic plate having a through hole for passing through the screw body is provided between the anti-corrosion layer and the rectangular plate. The protective cover is tightened by the screw body, which is provided so as to cover the shaped body, and projects outward from the protective cover by passing through the through hole, the tightening member screwed thereon, and the stopper. A metal columnar body having an anti-corrosion coating structure, characterized in that the attachment is fixed. 2. An anti-corrosion layer consisting of a single layer of primer and an anti-corrosion tape replaced on this layer is formed in close contact with the outer peripheral surface of a metal columnar body provided with a stopper, and a screw body is implanted on the anti-corrosion layer. On the other hand, a protective cover made of a glass fiber-reinforced plastic plate with a through hole for the threaded body and a buffer layer laminated on the inner surface of the protective cover are arranged on the anti-corrosion layer. and the screw body provided so as to cover the rectangular plate-shaped body and projecting outward from the buffer body and the protective cover through the through hole, the tightening member screwed thereto, and the stopper. A metal columnar body having an anti-corrosion coating structure, characterized in that the protective cover and the buffer body are tightened and fixed by.