JPH09296471A - Method for coating steel pipe pile with highly corrosion resistant metal coated plate - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a steel pipe pile that is used as a foundation of a marine structure and is required to have high corrosion resistance with a metal plate having high corrosion resistance such as a titanium plate, a titanium alloy plate, or a stainless plate. When it is formed into a cylindrical body and is fitted (extrapolated) into the steel pipe pile to cover and fix it, the cylinder with the optimum length is covered at the optimum position according to the seawater splash zone area of the steel pipe pile after driving the steel pipe pile. -Providing a method for coating a steel pipe pile that can be fixed with a highly corrosion-resistant metal plate. SOLUTION: A resin ring made of a foaming resin is adhered to an inner circumference of an end portion of a coated tubular body, the coated tubular body is fitted into a steel pipe pile driven into the sea, and is placed at a predetermined position in a seawater splash band region of the steel pipe pile. After the adjustment, the coating cylinder by foam expansion of the expandable resin is fixed to the steel pipe pile, and the filler is press-fitted into the gap formed between the coating cylinder and the steel pipe pile.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a steel pipe pile used in, for example, an offshore structure and required to have high corrosion resistance with a metal plate having high corrosion resistance such as a titanium plate, a titanium alloy plate or a stainless plate. It is about.

[0002]

2. Description of the Related Art Steel pipe piles used as offshore structures are exposed to splash on the sea surface, and corrosion progresses in this part is greater than in other parts, so durability in the splash zone is required. . Therefore, the seawater splash zone region of the steel pipe pile is covered with a highly corrosion-resistant metal plate such as a stainless plate or a titanium plate to further enhance the corrosion resistance.

For example, as shown in FIG. 3, a steel pipe pile 1 in which the surface of a steel pipe 1a is coated with a seawater-resistant coating material 1b.
A titanium plate or a titanium alloy plate 2 is wound around the both ends, both ends are bent, and the bent parts 2a and 2b are processed into a C shape and a fitting member made of a titanium or titanium alloy plate coated with a seawater insulating material ca on the inner surface side is formed. There has been proposed a steel pipe pile anticorrosion structure in which c is inserted and engaged as shown in FIG.

This steel pipe pile anti-corrosion structure can be constructed after driving the steel pipe pile, but in that case, it is necessary to construct it in seawater, which causes various difficulties in construction technology, and therefore it is preliminarily constructed on land. After that, the steel pipe pile is driven. At this time, the formation area of the steel pipe pile anti-corrosion structure is set by predicting the driving location, the ground, the difference in seawater tides, the size of the waves, etc.However, the driving of the steel pipe pile may not be as expected. Not a few. Therefore, in order to secure the effect of forming the steel pipe pile anticorrosion structure, it is customary to lengthen the region in which the steel pipe pile anticorrosion structure is formed, and therefore there is the problem that this leads to an increase in cost.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a steel pipe pile which is used as a foundation of, for example, a marine structure and is required to have high corrosion resistance, and a titanium plate or titanium alloy plate or a stainless plate as a highly corrosion-resistant metal coated plate. When inserting (extrapolating) and covering / fixing a cylindrical body formed by etc., the optimum length is set at the optimum position according to the seawater splash zone area (seawater splash / tidal zone) of the steel pipe pile after driving into the steel pipe pile. The present invention provides a method for coating a steel pipe pile, which is capable of coating and fixing the cylindrical body, with a metal plate with high corrosion resistance.

[0006]

The gist of the present invention is as follows. (1) In a method for coating a steel pipe pile with a highly corrosion-resistant metal-coated plate, wherein a coated tubular body made of a highly-corrosion-resistant metal plate is externally inserted and fixed to the outer periphery of the steel pipe pile, and foamed on the inner periphery of the end of the coated tubular body. Resin ring is adhered, the coated tubular body is fitted into a steel pipe pile driven into the sea, and the steel pipe pile is adjusted and arranged at a predetermined position in the seawater splash zone region of the steel pipe pile to expand and expand the foamable resin. A method for covering a steel pipe pile with a covering plate, comprising fixing the pile and the covering pipe body and then press-fitting a filler into a gap formed between the covering pipe body and the steel pipe pile. (2) In a method of coating a steel pipe pile with a highly corrosion-resistant metal-coated plate, wherein a coated tubular body made of a highly-corrosion-resistant metal plate is fitted and fixed to the outer periphery of the steel pipe pile. After hammering the steel pipe pile after temporarily fixing to, the foamed resin ring is adhered in the end portion of the coated tubular body, and then the coated tubular body is arranged at a predetermined position in the seawater splash zone region of the steel pipe pile, A method for coating a steel pipe pile with a cover plate, comprising foaming and expanding a foamable resin to fix the steel pipe pile and the coating pipe body, and press-fitting a filler into a gap formed between the coating pipe body and the steel pipe pile.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the examples shown in the drawings. FIG. 1 shows a structural example of a coated cylindrical body 2 made of a highly corrosion-resistant metal-coated plate that is externally inserted into a steel pipe pile 1 of the present invention and is coated and fixed. The highly corrosion-resistant metal-coated plate used in the present invention includes titanium, titanium alloy, stainless steel and the like, but titanium is used here.

On the inner surface of at least one end (both ends in the illustrated example) of the cylindrical body 2 made of titanium, the foamable resin rings 3a and 3b are fitted or adhered in a ring shape or applied. The foamable resin rings 3a, 3b have a diameter such that the inner circumference thereof can slide with respect to the outer surface of the steel pipe pile 1 when it is inserted into the steel pipe pile 1, and the foamable resin rings 3a, 3b expand when they come into contact with seawater, and the cylindrical body Is fixed to the steel pipe pile 1.

There is a gap 5 between the titanium-coated cylinder 2 and the steel pipe pile 1, and it is necessary to prevent corrosion by preventing seawater from entering there. Therefore, a pressure inlet 4 for press-fitting an anticorrosive filler (not shown) is provided in the wall portion of the titanium cylindrical body 2 between the foamable resin rings 3a and 3b. In the illustrated example, the pressure inlet 4 is provided in the cylindrical body 2, but it may be provided on the inner surface of the steel pipe pile 1.

FIG. 2 shows a state in which the steel pipe pile 1 is driven into the sea, the titanium cylinder 2 is externally inserted into the steel pipe pile 1, and the steel pipe pile 1 is locked at a predetermined splash band region position. The titanium cylinder 2 is dimensioned to have a length that can cover the splash zone area of seawater. Foaming resin rings 3a and 3b made of urethane resin that are foamed in contact with a liquid such as seawater (water) or a binder of a filler are intercalated and adhered to the inner surfaces of the upper and lower ends of the titanium cylinder 2. The expandable resin ring is inserted into the outer surface of the steel pipe pile 1 in such a compressed state that it can prevent the intrusion of seawater and is slidable, and is placed between the outer surface of the steel pipe pile 1 and the inner surface of the titanium cylindrical body 2. A gap 5 is formed.

That is, when the titanium cylinder 2 is covered and fixed at a predetermined position of the steel pipe pile 1, the titanium cylinder 2 in which the foamable resin rings 3a and 3b are inserted into the steel pipe pile 1 driven into seawater is used. Insert and slide the foamable resin rings 3a, 3b down to a predetermined position for alignment, expand the resin rings 3a, 3b in contact with seawater, and fix the titanium cylinder 2 to the steel pipe pile 1. .

The titanium cylinder 2 is provided with a pressure inlet 4, to which a press-fitting pipe 7 is mounted via a mounting jig 6, and to this press-fitting pipe a pressure-feeding device (not shown) for a filler 8 is inserted. It is connected to a filler supply source (not shown). And the filler 8
From the press-fitting supply source 9 through the pumping device 10, the filler 8 is press-fitted into the gap 5 formed between the steel pipe pile 1 and the titanium cylindrical bodies 3a and 3b from the pressurizing port 4. The filler 8 is made of epoxy resin, polymer resin, fluororesin, mortar, adhesive rubber or the like as a seawater resistant insulating material.

After the press-fitting of the filling material 8 is completed, the mounting port 6
The press-fitting pipe 7 is pulled out from the pressurizing port 4, and the pressurizing port 4 is closed with a seawater-resistant blocker (not shown). Thus, the press-fitting filler 5 is solidified, and the titanium cylindrical body 2 is supported in the seawater splash band region of the steel pipe pile 1 by the foaming resin ring, and can be firmly covered and fixed while maintaining watertightness together with the filler. In addition,
The surface of the steel pipe pile 1 may be coated with the seawater-resistant insulating paint 16 in advance. When the gap 5 with the titanium cylinder 2 is formed, the filler 8 may be further press-fitted as described above.
Moreover, the method shown in FIG. 4 may be used for the extrapolation support of the titanium cylindrical body 2 to the steel pipe pile 1.

In this embodiment, the titanium cylinder 2 having the foamable resin ring inserted therein is externally inserted into the steel pipe pile after being driven into the sea, and the filler 8 is press-fitted to the foamable resin ring 3a, Although the titanium cylinder is covered and fixed by expanding and solidifying 3b, the titanium cylinder is externally inserted in advance to the steel pipe pile 1 before driving and temporarily fixed, and the titanium cylinder is driven after driving the steel pipe pile. The cylindrical body may be fixed in the same manner as above.

In this case, if the expandable resin ring is inserted in the titanium cylinder, there is a risk that the expandable resin ring may be damaged or dropped by the impact of driving.
For example, only the titanium cylinder 2 is extrapolated to the steel pipe pile 1,
For example, a spring is interposed between the titanium cylinder 2 and the steel pipe pile 1 or supported by a fall prevention body (not shown), and after the steel pipe pile 1 is laid, the foamable resin rings 3a and / or 3b are arranged. The method of setting can also be adopted. The foamable resin rings 3a and 3b to be inserted into both ends of the titanium cylinder 2 may be divided into a plurality of pieces and fitted and adhered to the titanium cylinder 2 after the steel pipe pile 1 is driven.

In the present invention, the case where titanium is applied to the cylindrical body 2 has been described above, but the present invention is also applied as a covering method when a titanium alloy plate or a stainless plate is used as the covering material in addition to the titanium plate. Further, the covering material is not limited to the cylindrical body, and may be a cylindrical body such as a rectangular cylinder.

[0017]

EXAMPLE Using the method for coating a coated steel pipe pile on a coated steel pipe pile as shown in FIG. 1, foamable resin rings 3a, 3b are inserted into both ends of the coated steel pipe pile 1 driven into the sea. The titanium cylinder 2 is inserted and set at a position that covers the splash band area, and further the titanium cylinder 2 and the steel pipe pile 1 are set.
The filler 8 was pressed into the gap 5 between them. Foaming resin ring 3
The a and 3b expanded in contact with seawater, and the titanium cylindrical body 2 was covered and fixed to the steel pipe pile 1.

The steel pipe pile used has an outer diameter of 800 mm,
The covering material for covering this is a pure titanium plate (J
ISH4600 type 1 TP270C) outer diameter 810m
It was molded into a cylindrical shape with a length of m and a length of 5000 mm, and urethane foam resin rings (thickness 5 mm) were attached to both ends thereof. This cylinder was extrapolated and fixed to a pile to be planted in the sea. Then, a filler made of urethane resin was pressed into the gap between the cylinder and the pile.

With respect to the steel pipe pile in which the titanium cylindrical body is externally covered and fixed, after being left for half a year, the accuracy of the covering / fixing position of the titanium cylindrical body, strength, watertightness, influence on the steel pipe coating, etc. Inspected and evaluated. That is,
A large number of shellfish such as purple shellfish and Fujitsubo adhered to the titanium cylinder, but there was no water leak in the steel pipe coating, and the resin had the original tensile strength of 56 kg / cm ² There was no effect on. The filler was attached to the inner surface of the titanium cylinder, and when it was peeled off, it had a metallic luster at the time of grounding, and on the outer surface, the shell adhering surface had a perfect metallic luster when the shell was removed. As for the fixed position, the initially planned ground contact position of -3 m below the water surface (water level) and +2 m above the water surface was completely kept.

[0020]

According to the present invention, the seawater splash band region of the steel pipe pile is covered with a metal-coated plate having high corrosion resistance to seawater, such as titanium or titanium alloy stainless steel, which is formed into a cylindrical body and is externally attached to the steel pipe pile. In this case, since a foaming resin ring is inserted and adhered to the inner surface of the end of this covered cylinder, it is easy to adjust this cylinder to the prescribed position in the seawater splash zone area of the steel pipe pile driven into the sea. The water-tightness can be maintained and firmly fixed by the foaming expansion action of the expandable resin ring and the solidification action of the press-fitting filler.

Therefore, even if the driving position deviates from the predicted position, the covering cylinder can be surely covered at a predetermined position in the seawater splash band region of the steel pipe pile according to the deviation, and the covering can be performed as in the conventional case. It is not necessary to make the length longer than necessary, and the coating cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partial sectional side view outline explanatory view showing a structural example of a titanium cylindrical body used for carrying out the present invention.

FIG. 2 is a partial cross-sectional side view outline explanatory view showing an example of a covering structure of a titanium cylindrical body on a steel pipe pile for carrying out the present invention.

FIG. 3 is a three-dimensional schematic explanatory view showing an example of titanium plate coating on a steel pipe pile in a conventional example.

FIG. 4 is a partial plan view showing a fitted state of the bent portion of the titanium plate and the C-shaped fitting member in FIG.

[Explanation of symbols]

 1 Steel Pipe Pile 1a Steel Pipe 1b Seawater Insulation Coating 2 Titanium Cylindrical Body 3a, 3b Foaming Resin Ring 4 Pressing Port 5 Gap 6 Mounting Jig 7 Pressing Pipe 8 Filling Material 9 Pumping Device 10 Filling Material Supply S Undersea SL Sea Surface

Front Page Continuation (72) Inventor Isao Kanai 3-5-4 Tsukiji, Chuo-ku, Tokyo Within Nittetsu Welding Industry Co., Ltd. (72) Inventor Tadami Adachi 3-5-4 Tsukiji, Chuo-ku, Tokyo Date (72) Inventor Shinji Fukano 4-2-1 Asae, Higashi-shi, Yamaguchi Nittsu Welding Industry Co., Ltd. (2) Inventor Nobuhiro Goto 20-1 Shintomi, Futtsu, Chiba Shin Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Kazumi Matsuoka 20-1 Shintomi, Futtsu City, Chiba Prefecture Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Kazuhiro Kinoshita 2-6 Otemachi, Chiyoda-ku, Tokyo -3 Shin Nippon Steel Co., Ltd. (72) Inventor Yasuo Takahashi 2-6 Otemachi, Chiyoda-ku, Tokyo 3-6 Shin Nippon Steel Co., Ltd. (72) Inventor Hisashi Kanai 2-6 Otemachi, Chiyoda-ku, Tokyo -3 Nippon Steel Corporation (72) Inventor Masayoshi Akasaka 2-6-3 Otemachi, Chiyoda-ku, Tokyo Shin Nippon Steel Stock Association (72) Inventor Morihiro Wada 2-11-9 Iwamoto-cho, Chiyoda-ku, Tokyo Nittetsu Corrosion Protection Co., Ltd. (72) Inventor Toshio Kumayo 2-11-9 Iwamoto-cho, Chiyoda-ku, Tokyo Nitetsu Corrosion Protection Co., Ltd. (72) Inventor Toyoo Ando 2-11-9 Iwamoto-cho, Chiyoda-ku, Tokyo Nittetsu Corrosion Protection Co., Ltd. (72) Inventor Masahiro Endo 2-11-9 Iwamoto-cho, Chiyoda-ku, Tokyo Nitetsu Corrosion Protection Co., Ltd. Within

Claims (2)

[Claims] 1. A method for coating a steel pipe pile with a highly corrosion-resistant metal-coated plate, wherein a coating pipe body made of a highly corrosion-resistant metal plate is externally inserted and fixed to the outer periphery of the steel pipe pile. A foaming resin ring is adhered to, and the coated tubular body is fitted into a steel pipe pile driven into the sea and adjusted and arranged at a predetermined position in the seawater splash zone region of the steel pipe pile to expand the foaming resin. A method for coating a steel pipe pile with a cover plate, comprising fixing the steel pipe pile and the coating pipe body, and then press-fitting a filler into a gap formed between the coating pipe body and the steel pipe pile. 2. A method of coating a steel pipe pile with a highly corrosion-resistant metal-coated plate, wherein a coating cylinder made of a highly corrosion-resistant metal plate is fitted and fixed to the outer periphery of the steel pipe pile. After temporarily inserting the steel pipe pile into the upper part of the insert and driving the steel pipe pile, the foaming resin ring is adhered to the end of the coated pipe body, and then the coated pipe body is adjusted and arranged at a predetermined position in the seawater splash band region of the steel pipe pile. The foamed resin is expanded and expanded to fix the steel pipe pile and the coated pipe body, and the filler is press-fitted into the gap formed between the coated pipe body and the steel pipe pile. Coating method.