JPH09273697A - Steel pipe pile coating method with high corrosion resistance - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a steel pipe pile, which is used as a foundation of a marine structure and which requires high corrosion resistance, with a highly corrosive metal plate such as a titanium plate formed in a cylindrical body. So that it can be easily covered and fixed to the seawater after driving the steel pipe pile,
Also provided is a method for coating a steel pipe pile with a highly corrosion-resistant metal cylinder, which has a simple mounting structure, so that the covering tubular body is fixed at an optimum position according to the seawater splash zone region of the steel pipe pile. SOLUTION: When covering and fixing a cylinder made of a highly corrosion-resistant metal material on the outer periphery of a steel pipe pile in the seawater splash zone area, a support portion is provided at a lower position of the seawater splash zone area of the steel tube pile driven into the sea. It is characterized in that the supporting band that is provided is fixed by tightening, or further, the above-mentioned coated cylinder is externally fitted to the steel pipe pile and placed and fixed on the support portion of the supporting band.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe pile used in, for example, a marine structure, which is required to have high corrosion resistance, and a highly corrosion-resistant metal such as a titanium plate, a titanium alloy plate, or a stainless plate formed in a tubular shape. It relates to a method of covering the body.

[0002]

2. Description of the Related Art Steel pipe piles used as offshore structures are exposed to wave splashes (splash) on the surface of seawater, and the progress of corrosion in this part is greater than in other parts, so durability in the splash zone is high. Is required. Therefore, the seawater splash band 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. 7 (a), a steel pipe pile 21 whose surface is coated with a seawater-resistant coating material 21a.
A cylindrical coating material 22 made of a titanium plate or a titanium alloy plate having bent portions 22a and 22b formed on both ends is wound around the bent portion 22a and 22b, and the seawater insulating material 23a is processed into a C shape on the inner surface side. The fitting member 23 made of titanium or titanium alloy plate coated with 7 (b)
There is proposed a steel pipe pile anticorrosion structure in which the covering member 22 is fixed by fitting and engaging as shown in FIG. This steel pipe pile anticorrosion structure can be constructed after driving the steel pipe pile, but in that case, the construction is carried out in seawater, which causes various difficulties in construction technology. Therefore, the steel pipe piles will be driven after the construction is done on land beforehand. In this case, the setting of the covering material fixing area in the steel pipe pile on land is performed by predicting the ground at the place where the steel pipe pile is driven, the difference in seawater tide, the magnitude of waves, etc. There are many cases where the driving is not as expected. 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.

Further, Japanese Utility Model Laid-Open No. 62-44948 discloses a steel pipe pile S which is anticorrosion-treated by using a titanium thin plate having excellent corrosion resistance as a metal thin metal plate for coating as shown in FIG.
P is proposed. That is, the titanium cover body 24 having a desired width and length and the flanges 25 on both ends thereof are provided.
a, 25b and facing flanges 25a, 25b
An insulating material 26 is interposed between the flanges 25 and
The insulating flanges 27a and 27b are brought into contact with the outer sides of the flanges 25a and 25b, and the flange 25 is secured by the corrosion-resistant metal bolts and nuts 28.
a and 25b are detachably fixed. Here, 29 gap fillers, 30 is a buffer tank, 31 is an anticorrosive agent-impregnated layer, and 32 is a water stop plate. When attaching this titanium cover to the steel pipe pile, it is necessary to attach it with screws at multiple points, and performing this under the sea is a very complicated work, so there is a problem that the attachment cost becomes high. .

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, and a steel pipe pile, which is used as a foundation of an offshore structure or the like and which is required to have high corrosion resistance, has a high corrosion resistance metal coating. To enable the work of fitting (externally) covering and fixing a tubular body formed of a titanium plate, a titanium alloy plate, a stainless plate, etc. as a plate, even in seawater after driving a steel pipe pile, and In order to fix the covered tubular body at the optimum position according to the seawater splash zone area (seawater splash / tidal zone) of the steel pipe pile, a method for coating the steel pipe pile with a highly corrosion-resistant metal pipe with a simple mounting structure The purpose is to provide.

[0006]

In order to achieve the above object, the present invention has the following structure. In other words, (1) When covering and fixing a cylinder made of a highly corrosion-resistant metal material on the outer periphery of the steel pipe pile in the seawater splash zone area, a bearing is installed at the lower position of the seawater splash zone area of the steel tube pile driven into the sea. After tightening and fixing the supporting band that has,
A method for coating a steel pipe pile with a highly corrosion-resistant metal cylinder, wherein the coated pipe body is externally fitted to a steel pipe pile and is placed and fixed on a support portion of a support band, (2) a seawater splash band When covering and fixing the tubular body made of highly corrosion-resistant metal material on the outer circumference of the steel pipe pile in the area, tighten the support band with the bearing to the lower position of the seawater splash zone area of the steel pipe pile driven into the sea. After that, the covering cylinder is externally fitted to a steel pipe pile and placed on the support portion of the support band, and is tightened and fixed by an outer tightening band arranged on the outer circumference of the covering cylinder at the position of the support band. A method for coating a steel pipe pile with a highly corrosion-resistant metal cylinder. In the present invention, a filler having corrosion resistance can be press-fitted into the gap formed between the coated tubular body and the steel pipe pile to sufficiently fix the coated tubular body and improve the corrosion resistance of 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 is a front view of the steel pipe pile of the present invention which is upright in seawater, in which a splash zone is covered with a tubular body and a part of which is cross-sectioned. In the figure, 1 is a steel pipe pile, 2 is a support band made of a corrosion-resistant material such as titanium, titanium alloy or stainless steel, 3 is a coated cylinder made of a corrosion-resistant material such as titanium, titanium alloy or stainless steel,
4 is an outer fastening band made of the same material as the support band 2,
5 is a corrosion resistant filler.

The steel pipe pile 1 is driven into the seabed as a foundation of an offshore structure, but the vicinity of the sea surface of the pile 1 is washed by waves and exposed to splashes, so that corrosion progresses quickly. Usually, this part is painted or polyethylene or urethane type heavy corrosion protection is applied. However, there is a limit to the corrosion resistance of these steel pipe piles,
Its life is 15 to 20 years in the case of painting and 40 years in heavy corrosion protection. In the present invention, in order to further prolong the corrosion resistance of this portion, the outer periphery of the steel pipe pile in the range of ± several meters (hereinafter referred to as the splash zone) above and below the seawater surface is coated with the coating cylinder 3.

According to the present invention, the coating of the steel pipe pile 1 with the coated tubular body 3 is carried out on site, that is, the coated tubular body 3 can be fitted and supported on the steel pipe pile 1 standing upright in seawater. In some cases, the support band 2 is attached to the lower portion of the splash zone of the steel pipe pile 1 in advance on land.

The support band 2 has an L shape as shown in FIG.
It is a letter-shaped (angle) member and is composed of an upright portion 2a and a horizontal support portion 2b. This is processed into a ring shape along the outer circumference of the steel pipe pile, and at both ends of the support portion 2b, the upright portion 2a is formed. The gaps 6a and 6b are set between them, and the fastener 7a,
7b is fixed. FIG. 3 is an enlarged view of the stopper 7. The support band 2 is wound around a predetermined position on the outer circumference of the steel pipe pile 1 (below the splash zone), and the fasteners 7a and 7b
Is fastened with a bolt 8.

FIG. 4 shows another example of the support band 2 made of an L-shaped (angle) member made of a corrosion-resistant material. The ring-shaped support band shown in FIG. 3 is divided into two, and both end portions of the respective divided bands 9 and 10 are divided. Fasteners 11a, 11b and 12
a and 12b are installed. Installation to the steel pipe pile 1 is shown in Fig. 3.
Although it can be performed in the same manner as in the case of (3), it is convenient because it is a divided body, so it is easy to install and handle.

The steel pipe pile 1 to which the support ring 2 is attached is fitted with the covering cylindrical body 3, and the support ring support portion 2b (9a, 10).
The lower end of the coated tubular body 3 is placed on a). At this time, as shown in FIG. 5, the lower end portion of the covered tubular body 3 has a stopper 7a (7b).
Is inserted in the gap 6a (b) between the
As shown in FIG. 6, an outer tightening band 4 is arranged on the outer periphery of the outer circumference, and is clamped and fixed by fasteners 13a and 13b which are provided by shifting the mounting position from the fastener 7.

Since at least the thickness of the support band 2 can be provided between the coated cylindrical body 3 and the steel pipe pile 1, it is necessary to prevent corrosion by preventing seawater from entering there. Therefore, it is preferable to press-fit the anticorrosion filler 5 from the upper gap of the coated tubular body 3 or from the injection hole opened from the inside of the steel pipe pile 1. As the filler, epoxy resin, polymer resin, fluororesin, mortar, adhesive rubber or the like is used as a corrosion resistant or seawater resistant insulating material.

As described above, according to the present invention, since it is possible to easily cover and fix the tubular body made of the corrosion resistant material to the steel pipe pile, it is possible to easily carry out this kind of work which has been difficult in seawater. It has become possible.

[0015]

EXAMPLE As shown in FIG. 1, the steel pipe pile 1 driven into the sea was exposed to the water at the position of about 2 m below the water surface on the outer periphery of the steel pipe pile 1 as shown in FIG.
The operation of fixing the L-shaped support ring 2 in a cross section with bolts was performed. Thereafter, a pure titanium sheath pipe (covering cylinder) 3 is inserted from the upper portion of the steel pipe pile, the lower portion of the sheath pipe is placed on the horizontal support portion 2b of the support ring, and the outer periphery of the sheath pipe is tightened and fixed with a titanium band 4. The structure is as shown in FIG. After that, urethane resin was press-filled through the filling hole formed in the inner wall of the steel pipe pile.

The steel pipe pile used has an outer diameter of 400 mm,
The sheath tube that covers this is a pure titanium plate (JI
SH4600 1st class TP270C) outer diameter 1.258
A cylindrical one having a length of 500 mm and a length of 500 mm was used.
The supporting ring is a pure titanium plate similar to the above having a thickness of 3 mm, and the width of the supporting portion is 30 mm. The tightening band was also made of the same pure titanium plate and had a thickness of 1.0 mm and a width of 25 mm. For underwater work according to the above specifications, attach the tightening band of the sheath pipe 1
It takes 0 minutes, and in the conventional method, the diver attaches the screw at a plurality of places in the sea, so that the work time is drastically shortened as compared with 60 minutes.

[0017]

According to the present invention, the seawater splash zone 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 as a cylinder and is externally fitted to the steel pipe pile. In this case, the tubular body can be easily installed at a predetermined position in the seawater splash zone region of the steel pipe pile driven into the sea. Therefore, it is possible to surely coat the coated tubular body at a predetermined position in the seawater splash zone region of the steel pipe pile, and it is not necessary to unnecessarily lengthen the coating length as in the conventional case, and it is possible to reduce the coating cost.

[Brief description of drawings]

FIG. 1 is a front view showing a cross section of a part of an example of a cylindrical body covering structure obtained by the method of the present invention.

FIG. 2 is a perspective view showing an example of a support band for carrying out the present invention.

3 is a partially enlarged perspective view showing an end portion of a support band in FIG.

FIG. 4 is a plan view showing another example of a support band for carrying out the present invention.

FIG. 5 is an explanatory cross-sectional view showing the structure of the fastener of the present invention.

FIG. 6 is an explanatory view in which a part of the lower structure of the present invention is sectioned.

FIG. 7 (a) shows an example of a cylindrical body covering structure by a conventional method,
(B) is explanatory drawing which shows a fitting member.

FIG. 8 is an explanatory view showing another example of a tubular body covering structure by a conventional method.

[Explanation of symbols]

1: Steel pipe pile 2: Support band 2a: Upright part 2b: Support part 3: Covering cylinder 4: Tightening band 5: Filler 6a, 6b: Gap 7a, 7b: Fastener 8: Bolt 9, 10: Split band 11a , 11b, 12a, 12b, 13a, 13b: Stopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadami Adachi 3-5-4 Tsukiji, Chuo-ku, Tokyo Inside Nittetsu Welding Industry Co., Ltd. (72) Shinji Fukano 4-2-1 Asae, Hikari-shi, Yamaguchi Prefecture No. Nippon Steel Welding Industry Co., Ltd. Hikari Factory (72) Inventor Nobuhiro Goto 20-1 Shintomi, Futtsu City, Chiba Prefecture 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 2-6-3 Otemachi, Chiyoda-ku, Tokyo 2-6-3 Nippon Steel Corporation (72) Inventor Yasuo Takahashi 2-Otemachi, Chiyoda-ku, Tokyo 2- 6-3 Inside Nippon Steel Corporation

Claims (3)

[Claims] 1. A support portion at a lower position of the seawater splash zone area of a steel pipe pile driven into the sea when covering and fixing a cylinder made of a highly corrosion-resistant metal material on the outer periphery of the steel pipe pile in the seawater splash zone area. After fastening and fixing the support band having the above-mentioned, the coating cylinder is externally fitted to the steel pipe pile and placed and fixed on the support portion of the support band to coat the steel pipe pile with the highly corrosion-resistant metal cylinder. Method. 2. A support portion at a lower position of the seawater splash zone region of a steel pipe pile driven into the sea when covering and fixing a cylinder made of a highly corrosion-resistant metal material on the outer periphery of the steel pipe pile in the seawater splash zone region. After tightening and fixing the support band having the above, the covering cylinder is externally fitted to the steel pipe pile and placed on the support portion of the supporting band, and the external tightening arranged on the outer circumference of the covering cylinder at the position of the supporting band. A method for coating a steel pipe pile with a highly corrosion-resistant metal cylinder, which comprises tightening and fixing with a band. 3. The method for coating a steel pipe pile with a highly corrosion-resistant metal pipe according to claim 1, wherein a filler is press-fitted into a gap formed between the coated pipe body and the steel pipe pile.