JPH10272726A - Heavy-duty anticorrosive coating steel pipe pile and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To largely improve impact resistance by sequentially laminating protective layers constituted by any of glass fiber mat, polyester nonwoven fabric or polyester cloth and either polyester or urethane elastomer. SOLUTION: A primer layer 2 coated and cured in a range of 30 to 200 μm of a thickness is formed on an outer surface of a steel pipe pile 1, and an urethane elastomer layer 3 having a thickness of 1 to 10 mm is laminated on its outer surface. And, the outer surface is sequentially coated with protective layers 3 made of any of glass fiber mat, polyester nonwoven fabric and polyester cloth and either polyester or urethane elastomer. In the layer 4, mixing weight of the glass fiber with total weight of the mat, polyester or urethane elastomer is 5 to 50 wt.%, and the number of windings of the nonwoven fabric or cloth is once or more, and a thickness of the layer 4 is preferably 1 mm or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a steel pipe pile having an anticorrosion coating applied to an outer surface used in a construction method of a pier or a seawall in a harbor or a river. The present invention relates to a heavy-duty anticorrosion coated steel pipe pile having excellent coating impact resistance, and a method and an apparatus for manufacturing the same.

[0002]

2. Description of the Related Art Steel pipe piles used in the construction of structures such as quays and piers in harbors and rivers are made of urethane elastomer not only in highly corroded tidal zones and splash zones but also in the sea and underwater. Urethane elastomer-coated steel pipe piles that have been coated and protected from corrosion are frequently used. In an environment where erosion due to waves is severe, after laying a urethane elastomer-coated steel pipe pile, crushed stones are dropped around the pile to perform rubble-removal work to prevent scouring. For rubble stone application, the impact resistance of the coating is too small in the case of urethane elastomer-coated steel pipe, the coating is damaged, and the corrosion resistance is reduced. In JP-A-6-146271, as shown in FIG. 8, a protective layer 20 of polyester reinforced with a glass fiber mat or glass cloth is coated on the outer surface of a heavy corrosion-resistant coated steel pipe pile 1 having a urethane elastomer layer 3 on the outer surface. Heavy-corrosion-coated steel pipe piles with improved impact resistance are used. This heavy-corrosion-coated steel pipe pile has an effect of preventing the occurrence of penetration flaws in the anticorrosion layer for rubble of relatively small crushed stones.

As a method for coating a protective layer 20 made of glass fiber reinforced polyester on a heavy-corrosion-coated steel pipe pile disclosed in JP-A-6-146271, for example, as proposed in Japanese Patent Publication No. 4-55852, a polyester resin is used. The glass fiber mat impregnated by spraying the liquid from the nozzle and the glass cloth impregnated by passing through a tank filled with the same resin liquid are overlaid and sent out so that the glass fiber mat is inside and the glass cloth is outside. A glass fiber mat and a glass cloth, immediately before the glass fiber mat and the glass cloth are overlapped and wound on the outer surface of the steel pipe, as proposed in JP-A-2-266916. There is a method of spray-coating a polyester resin liquid. With these methods, a protective layer of glass fiber reinforced polyester can be coated.

[0004]

Recently, there has been a tendency to increase the size of crushed stone used for rubble and increase the amount of crushed stone dropped at one time in order to improve the efficiency of rubble stone construction.
Even with the heavy corrosion protection coated steel pipe pile disclosed in 146271, the impact resistance to the impact of crushed stone may be insufficient. Further, with respect to the method of coating a protective layer of glass fiber reinforced polyester proposed in Japanese Patent Publication No. 4-55852 and Japanese Patent Application Laid-Open No. 2-266916, a method of impregnating a glass fiber mat with a polyester resin liquid and then immersing the steel pipe is required. In these methods of coating, it takes too much time to impregnate the glass fiber mat with the polyester resin liquid, so that the production is not efficient.In addition, in the impregnation process, the sizing agent of the glass fiber is dissolved and the mold is easily deformed. When coating is performed while preventing the glass fiber mat from being deformed during coating, the coating can be performed only slowly, resulting in poor workability. Moreover, in order to improve the impact resistance, the protective layer must be coated many times in order to increase the thickness, which is not economical.

As described above, in the heavy-corrosion-coated steel pipes and steel pipe piles having the protective layer of glass fiber reinforced polyester, it is necessary to further improve the impact resistance against the impact of crushed stones and to develop a method of coating the protective layer with high production efficiency. Was desired.

According to the present invention, the impact resistance of the coating against crushed stones is further improved and the production is improved, as compared with the conventional heavy-corrosion-coated steel pipes and heavy-corrosion-coated steel pipe piles having a protective layer of glass fiber reinforced polyester. An object of the present invention is to provide a heavy-duty anticorrosion coated steel pipe pile having an efficient protective layer and a method of coating the protective layer.

[0007]

Means for Solving the Problems The present inventors have intensively studied to solve the above-mentioned problems. As a result, as shown in FIG. 1, a primer layer 2
By using a heavy-corrosion-coated steel pipe pile in which a urethane elastomer layer 3 and a protective layer 4 composed of one of glass fiber mat, polyester non-woven fabric or polyester cloth and either polyester or urethane elastomer are sequentially laminated, The impact resistance of the coating against the impact of crushed stones is remarkably improved, and as shown in FIG. 7, while rotating the urethane elastomer-coated steel pipe pile 13, the resin liquid of the polyester or urethane elastomer is sprayed on the surface of the pile 13. Immediately after coating with 19, a two-layer sheet fed out such that the inside becomes a glass fiber mat 16 and the outside becomes a polyester nonwoven fabric 17 or polyester cloth 17 is spirally wound and protected by a protective layer forming method of impregnating the inside with a resin liquid. Layer coating efficiency It found that remarkably improved, leading to the present invention.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The steel pipe pile of the present invention is made of carbon steel or stainless steel. The steel pipe pile made of carbon steel may be made of metal such as stainless steel, titanium, aluminum, etc. Nickel-chromium-molybdenum and other alloy-laminated clad steel pipes and clad steel pipe piles, steel pipes made of carbon steel and steel pipe piles with inner and outer surfaces plated with zinc, aluminum, chromium, zinc-iron, zinc-nickel, zinc -A plated material coated with an alloy such as aluminum can also be used. Furthermore, in order to easily set the steel pipe pile on a pile driving machine such as a diesel hammer, drop hammer or vibro hammer, a steel pipe pile with at least one pad attached to the outer surface of the pile pipe end or a steel ring on the outer surface of the pipe end A steel pipe pile with welded reinforcing bands attached with necessary accessories for pile driving and a steel ring on the outside of the pipe end of the steel pipe pile head to connect a concrete structure such as concrete footing to the top of the steel pipe pile Steel pipe piles welded with steel pipes, or steel pipe piles with brackets or the like previously attached to the pipe end outer surface of the steel pipe pile head to facilitate the construction of the superstructure can be used. Prior to use, it is necessary to remove scale from these steel pipe piles by blasting or the like.

The outer surface of the steel pipe pile of the present invention is desirably groundworked prior to coating. As the base treatment, for example, a chromate treatment or a phosphate treatment can be used, but a chromate treatment is desirable in order to improve the impact resistance against the impact of crushed stones. As the chromate treatment, commercially available silica-based chromate treatment agents and phosphoric acid-based chromate treatment agents can be used.However, in order to improve the impact resistance to the impact of crushed stones, the chromate treatment agent is applied to the outer surface of the steel pipe pile to form a coating. The coating is applied so that the total chromium deposition amount is in the range of 50 to 400 mg / m ² , and the steel pipe pile is heated and dried so that the surface thereof is in the range of 40 to 100 ° C. As a method of applying the chromate treatment agent, a method of applying with a roll, a method of applying with a brush, or a method of applying with a brush can be used.

[0010] A primer is applied to the outer surface of the steel pipe pile which has been subjected to the base treatment and cured to form a primer layer. As the primer, a commercially available urethane primer or epoxy primer can be used. However, in order to improve the impact resistance against crushed stones, a primer layer having a thickness of 3
Coating and curing so as to be in the range of 0 to 200 μm.
As a method of applying the primer, a method of spray coating, a method of applying with a roll, a method of applying with a brush, or a method of applying with a brush can be used.

A urethane elastomer layer is laminated on the outer surface of the steel pipe pile covered with the primer layer. As the urethane elastomer, for example, a liquid polyurethane resin paint of a type in which a commercially available polyol is cured with an isocyanate-based curing agent can be used. Good results can be obtained if the thickness of the urethane elastomer layer is 1 to 10 mm. As a method of coating the urethane elastomer, a method of spray coating, a method of applying with a spatula or a brush and the like can be used.

Before the urethane elastomer layer hardens, the outer surface of the steel pipe pile coated with the urethane elastomer layer is
A protective layer made of any one of glass fiber mat, polyester nonwoven fabric or polyester cloth and either polyester or urethane elastomer is coated. If any one of the glass fiber mat, the polyester nonwoven fabric, the polyester cloth, and the polyester or urethane elastomer is missing in the protective layer, the impact resistance of the crushed stones is not improved. The mixed weight of the glass fiber with respect to the total weight of the glass fiber mat and the polyester or urethane elastomer in the protective layer is 5 to 50% by weight, and the number of turns of the polyester nonwoven fabric or the polyester cloth is one or more, and When the film thickness is 1 mm or more, the impact resistance against the impact of crushed stones is dramatically improved. The upper limit of the thickness of the protective layer is set at a necessary value according to the weight of the falling crushed stone and the falling height. Any glass fiber mat can be used as long as it is a commercially available glass strand cut into a mat shape with a binder such as a polyester resin. As the polyester non-woven fabric or polyester cloth, a non-woven fabric or cloth made of a generally commercially available polyester fiber can be used. As the polyester, a liquid polyester such as a commercially available unsaturated polyester resin or a vinyl ester resin also called an epoxy acrylate resin can be used. Further, as the urethane elastomer, for example, any commercially available polyurethane resin paint of a type in which a polyol is cured with an isocyanate-based curing agent or the like can be used as long as it is liquid.

When it is necessary to color the coating in various colors in order to harmonize the heavy-corrosion-resistant steel pipe pile of the present invention with the surrounding environment, any one of the glass fiber mat, polyester non-woven fabric and polyester cloth shown in FIG. This can be achieved by coloring the protective layer 4 composed of one of the polyester and the urethane elastomer. As a method thereof, an organic or inorganic pigment may be blended in advance with a polyester or urethane elastomer, which is a component of the protective layer 4, to adjust the color, and spray-painted by the method shown in FIG.
In order to further improve the smoothness and gloss of the appearance, for example, as shown in FIG. 2, any one of a glass fiber mat, a polyester nonwoven fabric or a polyester cloth and a polyester or a urethane elastomer colored in an arbitrary color On the outer surface of the protective layer 4
A colored layer 5 made of an acrylic resin or a fluororesin which is toned to the same color as that of the above is laminated. In this case, the thickness of the coloring layer 5 may be about 10 to 200 μm. When a long-term weather resistance is required for the protective layer, as shown in FIG. 3, any one of glass fiber mat, polyester non-woven fabric or polyester cloth and any one of polyester or urethane elastomer colored in an arbitrary color Acrylic resin layer 6 toned white on the outer surface of protective layer 4 made of
Then, a coloring layer 7 made of a fluororesin and toned in the same color as the protective layer 4 is laminated. In this case, a good result can be obtained if the thickness of the colored layer 7 made of the fluororesin toned to the same color as the white acrylic resin layer 6 and the protective layer 4 is about 10 to 200 μm.

FIG. 4 shows the heavy-corrosion-coated steel pipe pile of the present invention in detail in a coating configuration. In the drawing, reference numeral 1 denotes a steel pipe pile subjected to a base treatment, 2 denotes a primer layer, 3 denotes a urethane elastomer layer, and 4 denotes any one of glass fiber mats, polyester non-woven fabrics or polyester cloths of any color of the present invention and polyester. Alternatively, the protective layer is made of any one of urethane elastomers. As an example of use of the heavy-corrosion-coated steel pipe, for example, in the case where the whole sea area, the splash zone, the tidal zone, and the mid-sea area are protected by direct piles used in port construction, urethane as shown in FIG. An elastomer coating is applied over these portions and a portion of the seabed 8, and any one of a glass fiber mat, a polyester nonwoven fabric or a polyester cloth and a polyester or urethane elastomer is coated so as to cover the entire area provided with the urethane elastomer layer. One of the protective layers 4 is laminated and piled to form a straight pile as shown at 9 in FIG.
If the crushed stone is dropped from the sea by a bucket or the like after the completion of the pile driving and the rubble 10 is constructed, the effect of the present invention is exhibited, and the damage of the urethane elastomer layer due to the falling impact of the crushed stone can be avoided.

In the construction of a pier or a dolphin structure used as a set pile as a mooring post of a ship or the like, slanted piles are frequently used. However, slanted piles are used in the marine atmosphere, splash zone, tidal zone and mid-sea. When the whole is to be protected, for example, as shown in FIG.
A protective layer 4 made of glass fiber mat, polyester non-woven fabric or polyester cloth and polyester or urethane elastomer so as to cover the entire area coated with the urethane elastomer. The piles are piled, slanted at a predetermined angle and piled to form a slant pile as shown in FIG. After stakeout is completed, crushed stones are dropped from the sea with buckets, etc.
The effect of the present invention can be exerted by applying the method, the damage of the urethane elastomer layer caused by the falling impact of the crushed stone can be avoided, and the anticorrosion function can be maintained.

As shown in FIG. 7, the urethane elastomer-coated steel pipe pile 13 is turned while the polyester or urethane elastomer resin liquid is applied to the surface thereof by a spray nozzle 19, and the inside of the protective layer is coated with the spray nozzle 19, as shown in FIG. This is performed by a method of spirally winding a two-layer sheet that is fed out so that the outside becomes a polyester nonwoven fabric or a polyester cloth 17 with the glass fiber mat 16. According to this method, a polyester or urethane elastomer resin liquid is sprayed on the urethane elastomer-coated surface of the steel pipe pile, and a glass fiber mat lined with a polyester nonwoven fabric or polyester cloth is immediately pressed on the surface, so that the glass fiber mat is The polyester resin or urethane elastomer resin solution is quickly impregnated into the interior and integrated, dramatically improving the impact resistance against crushed stones and the polyester nonwoven fabric even when the sizing agent of the glass fiber mat is dissolved. Since it is lined with polyester cloth, it can be prevented from breaking down, and the efficiency of covering the protective layer is dramatically improved. When polyester is used as the resin liquid, the welding with the polyester nonwoven fabric or polyester cloth is particularly fast, so that the coating can be performed at a high speed.

As shown in FIG. 7, the protective layer coating apparatus includes two sets of two drive rolls 14 for supporting the lower portions of both ends of the urethane elastomer-coated steel pipe pile 13 and rotating the coated steel pipe. A rotary traveling vehicle 15 running entirely in the tube axis direction, a shaft disposed on the side surface of the rotary traveling vehicle 15 and rotating on the upper side through a core of a coil 16 of glass fiber mat, and polyester on a lower side. A two-layer sheet feeding device 18 having a shaft that rotates through the core of a nonwoven fabric or polyester cloth coil 17 and stacking a glass fiber mat and a polyester nonwoven fabric or polyester cloth from both coils and feeding the same to the lower surface of the coated steel pipe; A polyester or urethane elastomer is disposed on the coated steel pipe surface immediately above the unwound double-layer sheet, which is disposed beside the unwinding apparatus of the two-layer sheet. Coating nozzle applying over at atomized 1
9 can be used.

[0018]

The present invention will be described below in detail with reference to examples. FIG. 1 is a drawing showing a partial cross section of a heavy corrosion protection coated steel pipe pile of the present invention, FIG. 2 is a drawing showing a partial cross section of a heavy corrosion protection coated steel pipe pile of the present invention, and FIG. Drawing showing a partial cross-section, FIG. 4 is a drawing showing the coating structure of the heavy-corrosion-coated steel pipe pile of the present invention, and FIG. 5 is a drawing showing the present invention in the case of protecting the sea atmosphere, the splash zone, the tidal zone and the sea. Drawing showing an example of use as a heavy pile of heavy corrosion protection coated steel pipe pile, FIG.
Drawing showing an example of the use of the heavy corrosion-resistant coated steel pipe pile of the present invention as an oblique pile in the case of protecting the splash zone, the tidal zone and the sea, and FIG. 7 shows the protective layer of the heavy corrosion-resistant coated steel pipe pile of the present invention. Drawing which shows a coating method and a coating apparatus, FIG. 8: is a drawing which shows a partial cross section of the conventional heavy-corrosion coating steel pipe pile.

[Example 1] Steel pipe (outer diameter 200A x 550)
The outer surface (0 mm length × 5.8 mm thickness) was grit blasted to remove scale. A silica-based chromate treating agent was applied to the outer surface by brushing with a brush so that the total amount of chromium adhered was 400 mg / m ² , heated to 40 ° C., dried, and subjected to a base treatment. Immediately thereafter, a urethane-based primer was spray-coated on the outer surface so as to have a film thickness of 40 μm and cured to form a primer layer. Next, a two-component curable urethane elastomer having a thickness of 2.5
mm to cover the urethane elastomer layer. Before the urethane elastomer layer was completely cured, the outer surface of the urethane elastomer-coated steel pipe pile was coated with the protective layer of the present invention using the production method and production apparatus shown in FIG. That is, the urethane elastomer-coated steel pipe pile 13
Immediately after the surface is coated with the polyester resin liquid by the spray nozzle 19, the inside is made of the glass fiber mat 16 and the outside is made of the polyester non-woven fabric 17.
The protective layer was covered by a method in which a two-layer sheet drawn out so as to be spirally wound. At that time, the mixing amount of the glass fiber was 20% by weight based on the total weight of the glass fiber mat and the polyester in the protective layer, and the polyester non-woven fabric was 1%.
Twisted (However, the overlapping part of the wrap 15mm is twice wound)
However, the coating was performed by changing the thickness of the protective layer.

As a comparative example, the same resin as a glass fiber mat impregnated by spraying a polyester resin liquid from a nozzle onto a surface of a urethane elastomer-coated steel pipe pile by a method disclosed in Japanese Patent Publication No. 4-55852. The impregnated gas cloth is passed through the tank filled with the liquid, and the impregnated gas cloth is piled up and sent out, and wound around the coated steel pipe pile with the glass fiber mat on the inside and the glass cloth on the outside.
A conventional heavy duty anticorrosion coated steel pipe pile corresponding to No. 46271 was manufactured. At this time, the mixing amount of the glass fiber with respect to the total weight of the glass fiber mat and the polyester in the protective layer was 20%.
% By weight, and the glass cloth was wound once (however, the overlapped portion of the wrap was wound twice at 15 mm), but the coating was performed by changing the thickness of the protective layer.

These heavy-corrosion-coated steel pipes are cut and processed.
The penetration energy of the coating was measured by a falling weight impact test specified in STM G14. FIG. 9 shows the relationship between the thickness of the protective layer and the impact energy. As can be seen from FIG. 9, the heavy-corrosion-coated steel pipe of the present invention is sprayed with a resin solution of polyester or urethane elastomer on the urethane elastomer-coated surface, and immediately, a glass fiber mat lined with a polyester nonwoven fabric or polyester cloth is strongly pressed on the surface. In addition, the impregnation of the resin liquid of the polyester or urethane elastomer into the glass fiber mat is quickly performed and integrated, and the impact energy is remarkably improved as compared with the conventional heavy corrosion-resistant coated steel pipe. Incidentally, the protective layer of the heavy-corrosion-coated steel pipe of the present invention is effective when the thickness is 1 mm or more.
When the thickness of the protective layer is 2.5 mm, the full-length coating of the protective layer of the heavy-corrosion-coated steel pipe of the present invention was completed in about 30 minutes.
It took a long time of about 4 hours and 30 minutes for the conventional heavy duty corrosion-resistant coated steel pipe. That is, according to the method for coating a protective layer of the present invention, the efficiency of coating is dramatically improved as compared with the conventional method.

Example 2 A heavy duty anticorrosion coated steel pipe of the present invention was produced by changing the polyester used for forming the protective layer of Example 1 to urethane elastomer. These heavy corrosion-resistant coated steel pipes were cut, and the penetration energy of the coating was measured by a falling weight impact test specified in ASTM G14. FIG. 10 shows the relationship between the thickness of the protective layer and the impact energy. FIG.
From 0, even if a urethane elastomer is used to form the protective layer of the heavy-corrosion-coated steel pipe of the present invention, a large impact energy can be obtained and good, similarly to the case of using polyester.

Example 3 The heavy corrosion-resistant coated steel pipe of the present invention was manufactured by changing the amount of glass fiber used for forming the protective layer in Examples 1 and 2. At that time, the thickness of the protective layer was 2.5 mm. These heavy corrosion-resistant coated steel pipes were cut, and the penetration energy of the coating was measured by a falling weight impact test specified in ASTM G14. FIG. 11 shows the relationship between the amount of glass fiber mixed in the protective layer and the impact energy. FIG.
From 1, the formation of the protective layer of the heavy-corrosion-coated steel pipe of the present invention includes:
If the amount of the glass fiber mixed with respect to the total weight of the glass fiber mat and the polyester or urethane elastomer in the protective layer is 5 to 50% by weight, a large impact energy is obtained and good.

Example 4 A heavy duty anticorrosion coated steel pipe of the present invention was manufactured by changing the number of winding times of the polyester nonwoven fabric used for forming the protective layer in Examples 1 and 2. At that time, the thickness of the protective layer was 2.5 mm. These heavy corrosion-resistant coated steel pipes were cut, and the penetration energy of the coating was measured by a falling weight impact test specified in ASTM G14. FIG. 12 shows the relationship between the number of windings of the polyester nonwoven fabric of the protective layer and the impact energy. As shown in FIG. 12, in forming the protective layer of the heavy-corrosion-coated steel pipe of the present invention, when the polyester non-woven fabric is wound around the protective layer at least once, a large impact energy can be obtained, which is favorable.

Example 5 The heavy duty anti-corrosion coated steel pipe of the present invention was manufactured by changing the polyester nonwoven fabric of Example 4 to a polyester cloth and changing the number of windings. that time,
The thickness of the protective layer was 2.5 mm. These heavy corrosion-resistant coated steel pipes were cut, and the penetration energy of the coating was measured by a falling weight impact test specified in ASTM G14. FIG. 13 shows the relationship between the number of windings of the polyester nonwoven fabric of the protective layer and the impact energy. From FIG. 13, even if a polyester cloth is used in place of the polyester nonwoven fabric for forming the protective layer of the heavy-corrosion-coated steel pipe of the present invention, if the polyester cloth is wrapped in the protective layer at least once, a large impact energy can be obtained, which is good. .

[Example 6] A heavy-corrosion-coated steel pipe of the present invention of Examples 1 and 2 having a protective layer having a thickness of 2.5 mm was manufactured. Like 5,
The submarine ground was poured. After casting, JI in the bucket of 4m ³
Crushed stones mainly including hard stones equivalent to No. 1 slabs specified in SA5006 were grabbed, and a total of 120 m ³ were thrown into the protective coating of the heavy-duty corrosion-resistant steel pipe piles, and rubbled as shown in 10 in FIG. After the rubble was applied, the coating surface was examined. As a result, small flaws were generated on the surface of the protective layer. However, there was no flaw on the urethane elastomer layer, and the damage could be prevented.

[0027]

According to the present invention, the heavy duty anticorrosion coated steel pipe and the heavy duty anticorrosion coated steel pipe pile are firmly integrated with either glass fiber mat, polyester nonwoven fabric or polyester cloth and either polyester or urethane elastomer. It has a protective layer, and since the protective layer adheres sufficiently to the urethane elastomer layer, the impact resistance is greatly improved as compared with the conventional heavy-corrosion-coated steel pipe piles, and the urethane elastomer layer due to the impact of crushed stones is improved. Damage can be prevented. Moreover, according to the method for forming a protective layer of the present invention, immediately after spray coating either the polyester or the urethane elastomer on the surface of the urethane elastomer layer, the glass fiber mat lined with a polyester nonwoven fabric or a polyester cloth from the surface. Is strongly pressed, the impregnation of the glass fiber mat with the polyester or urethane elastomer proceeds rapidly, and the coating efficiency can be dramatically improved.

[Brief description of the drawings]

FIG. 1 is a drawing showing a partial cross section of a heavy corrosion-resistant coated steel pipe pile of the present invention.

FIG. 2 is a drawing showing a partial cross section of a heavy-corrosion-coated steel pipe pile of the present invention.

FIG. 3 is a drawing showing a partial cross section of a heavy-corrosion-coated steel pipe pile of the present invention.

FIG. 4 is a drawing showing the configuration of the coating of the heavy corrosion-resistant coated steel pipe pile of the present invention.

FIG. 5 is a drawing showing an example of using the heavy-corrosion-resistant coated steel pipe pile of the present invention as a straight pile in the case of protecting the sea atmosphere, the splash zone, the tidal zone, and the sea.

FIG. 6 is a drawing showing an example of the use of the heavy-corrosion-coated steel pipe pile of the present invention as a slanted pile in the case of protecting the sea atmosphere, the splash zone, the tidal zone and the sea.

FIG. 7 is a drawing showing a method and an apparatus for coating a protective layer according to the present invention.

FIG. 8 is a view showing a partial cross section of a conventional heavy-corrosion-coated steel pipe pile.

FIG. 9 is a diagram showing the relationship between the impact energy and the thickness of the protective layer of the heavy corrosion-resistant coated steel pipe pile of the present invention and the conventional heavy corrosion-resistant coated steel pipe pile.

FIG. 10 is a graph showing the relationship between the thickness of the protective layer and the impact energy of the heavy-corrosion-coated steel pipe pile of the present invention, in comparison with the case where a polyester is used to form the protective layer and the case where a urethane elastomer is used.

FIG. 11 is a diagram showing the relationship between the amount of glass fiber mixed in the protective layer of the heavy corrosion-resistant coated steel pipe pile of the present invention and the impact energy.

FIG. 12 is a diagram showing the relationship between the number of windings of the polyester nonwoven fabric of the protective layer of the heavy corrosion-resistant coated steel pipe pile of the present invention and the impact energy.

FIG. 13 is a diagram showing the relationship between the number of windings of the polyester cloth of the protective layer of the heavy corrosion resistant coated steel pipe pile of the present invention and the impact energy.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 Primer-treated steel pipe pile 2 Primer layer 3 Urethane elastomer layer 4 Colorless or arbitrary colored glass fiber mat, polyester nonwoven fabric or polyester cloth, and the present invention composed of either polyester or urethane elastomer Protective layer 5 Colored layer made of acrylic resin or fluororesin colored in the same color as 4 6 White acrylic resin layer 7 Colored layer made of fluororesin colored in the same color as 4 8 Submarine ground 9 Weight of the present invention Straight pile of anticorrosion coated steel pipe pile 10 Ripstone 11 Sea surface 12 Oblique pile of heavy corrosion protection coated steel pipe pile of the present invention 13 Urethane elastomer-coated steel pipe pile 14 Two sets of two supporting and rotating the lower part of both pipe ends of urethane elastomer-coated steel pipe pile Drive roll 15 A rotary traveling vehicle 1 that travels with the drive roll 14 mounted thereon 1 Glass fiber mat coil 17 Polyester non-woven fabric or polyester cloth coil 18 An upper side has an axis that rotates through the glass fiber mat coil core, and the lower side rotates through the polyester non-woven fabric or polyester cloth coil core. A double-layer sheet feeding device for stacking a glass fiber mat and a polyester nonwoven fabric or polyester cloth from both coils and feeding it to the lower surface of a 13-coated steel pipe pile 19 A coating nozzle for applying a polyester or urethane elastomer in a mist state 20 Protective layer of conventional heavy duty anticorrosion coated steel pipe pile

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yasuhiro Sueuchi 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Corporation Kimitsu Works (72) Inventor Hirotaka Sato 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Inside the Kimitsu Works (72) Inventor Shinichi Funatsu 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Inside the Kimitsu Works (72) Inventor Hiroshi Okada 2-6-3 Otemachi, Chiyoda-ku, Tokyo New Japan Inside Steel Works

Claims (5)

[Claims] 1. A primer layer, a urethane elastomer layer, a glass fiber mat,
A heavy duty anticorrosion coated steel pipe pile, wherein a protective layer composed of either polyester nonwoven fabric or polyester cloth and either polyester or urethane elastomer is sequentially laminated. 2. The heavy duty anticorrosion coated steel pipe pile according to claim 1, wherein the protective layer is colored and a colored layer of acrylic resin or fluororesin colored in the same color is laminated on the outer surface thereof. 3. The protective layer is colored, and a colored layer made of a fluororesin colored in the same color as the protective layer is laminated on the outer surface of the protective layer via an acrylic resin layer colored white. The heavy corrosion-resistant coated steel pipe pile according to claim 1. 4. While rotating a urethane elastomer-coated steel pipe pile, immediately after spray-coating a polyester or urethane elastomer resin liquid on the surface thereof, a glass fiber mat is formed inside and a polyester nonwoven fabric or polyester cloth is formed outside. A method for producing a heavy duty corrosion-resistant coated steel pipe pile, comprising forming a protective layer by winding a two-layer sheet to be fed in a spiral shape and impregnating the inside with a resin liquid. 5. A rotary traveling bogie having two sets of two drive rolls each supporting a lower portion of both pipe ends of a urethane elastomer-coated steel pipe pile and rotating the coated steel pipe pile, and the entirety of which runs in the pipe axis direction. A shaft disposed on the side surface of the rotary traveling vehicle and having an upper side that rotates through a core of a glass fiber mat coil, and a lower side that rotates through a core of a polyester nonwoven fabric or polyester cloth coil. A two-layer sheet feeding device that has a glass fiber mat and a polyester cloth overlapped from both coils and feeds the urethane elastomer-coated steel pipe pile to the lower surface, and a two-layer sheet that is arranged and fed beside the two-layer sheet feeding device Of protective layer of heavy duty anti-corrosion coated steel pipe pile consisting of spray nozzle which sprays polyester or urethane elastomer on the surface of coated steel pipe pile directly above Place.