JPH06101215A - Supporting structure for pontoon by use of outside coating steel pipe pile - Google Patents

Abstract

PURPOSE:To promote durability by making an outside coating steel pipe pile subsequently laminating an underground treatment layer, a corrosion proof coating layer and a high strength protection layer as a bearing pile, mounting a resin roller to a pontoon, and bringing the resin roller into contact with the bearing pile to hold the floating pier. CONSTITUTION:A bearing pile is so formed that a corrosion proof coating layer 10 constituted of an underground treatment layer 9 and an methane elastomer resin and a high strength protection layer 11 having more than coated film hardness Shore D hardness 55 consistuted of high strength urethane elastomer resin and others are subsequently laminated on the surface of a steel pipe pile 1. Resin rollers 8 having Shore D hardness 33-50 are mounted to a plurality of positions of a pontoon 7, and they are brought into contact with the steel pipe pile 1 to hold the floating pier.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure of a floating jetty with an outer surface coated steel pipe pile.

[0002]

2. Description of the Related Art Conventionally, steel materials used for piles in the ocean, harbors, etc. are exposed to a severe environment of use, and corrosion of tidal zones is a serious problem. Therefore, heavy-corrosion coated steel materials such as polyolefin resins and thermosetting resins have been widely marketed. These heavy anticorrosion coated steel materials are required to have not only anticorrosion properties but also mechanical properties that can sufficiently withstand the impact of driftwood and the like. By the way, in recent years, this heavy anticorrosion coated steel material has come to be used as a support pile for a floating mooring berth, and a large load is locally applied to the part where the supporting roller of the floating mooring shore comes into contact, and the coating film peels There is a problem of doing.

Therefore, in order to maintain the appearance of the support pile and improve the durability of the coating, a polyolefin resin or a thermosetting resin is used as an anticorrosion coating layer as disclosed in Japanese Patent Laid-Open No. 4-71842. In a reinforced plastic composite coated steel material in which the surface of the coating layer is coated with a strength plastic, by using an inorganic fiber or an organic fiber as a flocking material to intervene at the interface between the anticorrosion coating layer and the strength plastic, the impact is improved. A composite coated steel material in which damage to the anticorrosion coating layer due to mechanical action such as abrasion is prevented is known.

[0004]

However, in the composite coated steel material as described above, it is possible to prevent damage due to mechanical action such as impact and abrasion, but it is possible to use the support roller on the floating mooring shore. In the holding structure, a large load is locally applied to the contacting part.Therefore, if the hardness of the supporting roller is high, even if the supporting pile is compositely coated as described above, there is a problem that the coating is damaged because one side is hard. It was

[0005]

[Means for Solving the Problems] In order to solve such a problem, the inventors of the present invention have made earnest developments, and as a result, clarified the relationship between the steel pipe pile and the resin roller by harmony of the hardness. Therefore, it is intended to improve the durability. The gist of the invention is that a base treatment layer,
An outer surface coated steel pipe pile in which a high-strength protective layer having a corrosion protection coating layer and a coating hardness Shore D hardness of 55 or more is sequentially laminated is used as a support pile,
A support structure is provided by an outer surface covered steel pipe pile of a floating pier, characterized in that a resin roll having a Shore D hardness of 35 to 50 is attached to the floating pier and held in contact with the supporting pile.

The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic view of a floating jetty. Figure 1
As shown in (1), the floating pier 7 is held in the shore 2 by the steel pipe piles 1 to be levitated as a floating mooring berth, and constitutes a place for the ship 3 to anchor. FIG. 2 is an explanatory view of a high-strength steel pipe pile for a floating pier according to the present invention. In the figure, 1 is a steel pipe pile, 4 is a high-strength coating layer, 8 is a resin roller, and 7 is a floating jetty. In this way, the high-strength steel pipe pile for a floating pier constantly moves up and down because the resin roller on the surface of the steel pipe pile contacts and the water level rises and falls due to waves, seawater high tide, and low tide.

FIG. 3 is a detailed sectional view showing the support structure of the floating pier. As shown in the figure, the steel pipe pile 1 is surrounded and supported by four resin rollers 8, and the floating pier 7 is fixed laterally and moved vertically. Reference numeral 6 is a protective material for preventing the floating pier 7 from impact such as driftwood, and reference numeral 5 prevents impact on the steel pipe pile 1 due to waves of the resin roller 8, and the steel pipe pile 1 and the resin roller 8 are soft. A cushioning material for holding in contact.

FIG. 4 is a partial sectional view of a heavy anticorrosion coating material for a steel pipe pile. As shown in FIG. 4, a base treatment layer 9 which is a primer layer is provided on the surface of the steel pipe pile 1, and an anticorrosion coating layer 10 made of a urethane elastomer resin layer and a high-strength protection layer 11 are provided on the surface treatment layer 9 for a floating bridge. It is a steel pipe pile. The reason why the four-layer type is used is that the undercoating layer 9 and the anticorrosion coating layer 10 made of a urethane elastomer resin layer have adhesiveness, water resistance, impact resistance, and insulation resistance, and the high-strength protective layer 11
In particular, the load-bearing impact resistance is given special importance and excellent properties are given to each. The preferable coating thickness of each of the four layers is 15 to 60 μm for the base treatment layer 9 and the anticorrosion coating layer 10.
Is 2 to 6 mm, and the high-strength protective layer 11 is 1 to 10 mm.

As a coating method, the anticorrosive surface of the steel pipe pile is blasted by grit blasting, sand blasting or the like to clean it, and then the undercoating layer 9 is coated. The base treatment layer 9 is an adhesive between the surface of the steel pipe pile and the anticorrosion coating layer 10, for example, a urethane elastomer resin layer. The coating material is an organic resin primer such as an epoxy resin primer or a urethane resin primer, which has excellent adhesion to the urethane elastomer resin layer. The urethane elastomer resin layer is a long-term anticorrosion layer. The high-strength protective layer 11 is a load-bearing impact protective layer. This high-strength protective layer 11 is used only for the coating portion of the steel pipe pile which is in contact with the resin roller supporting the floating jetty.

The coating strength of the high-strength protective layer 11 is Shore D.
A high-strength urethane elastomer resin having a strength of 55 or more, or a high-strength material capable of withstanding an external load and an impact force such as a fiber-reinforced urethane elastomer resin is used. The high-strength protective layer 11 can be colored at all in order to maintain its aesthetic appearance unless the performance of the present invention is impaired. Further, if the anticorrosion coating layer 10 has a high strength of Shore D55 or higher, the anticorrosion coating layer 10 alone has sufficient durability because it has the required performance of the high strength protective layer 11.

On the other hand, it is desirable to use the same resin for the resin roll and to use a coating material that is a little softer than the coating of the steel pipe pile described above. That is, it is necessary to use a resin roll having a Shore hardness D of 35 to 50 as the coating film hardness of the resin roller. The reason for this is that if the coating hardness of the resin roller exceeds 50 Shore Shore D and exceeds 55 the coating hardness of the coating layer of the steel pipe pile, the coating layer of the steel pipe pile will also be damaged due to the relationship between the two. On the other hand, if the Shore hardness D of the resin roll is less than 35, the resin roller will be damaged in a short time, and therefore the cost will increase if the rolls are not replaced frequently.

Further, if the coating hardness of both the resin roll and the steel pipe pile coating layer is less than 35 and less than 55, the deformation is large and the damage is frequent, and conversely, when both are hard, the deformation is small. Both of them will be damaged and will be cracked by the impact of the large waves. Therefore, in the present invention, the coating hardness of the steel pipe pile coating layer is the Shore hardness D55.
The durability is improved by using the above-mentioned high-strength protective layer and by using the resin roll supporting the steel pipe pile whose Shore hardness D is in the range of 35 to 50.

[0013]

EXAMPLES Table 1 shows the protective layer, roll strength and performance test results of Examples 1 to 3 and Comparative Examples 1 to 3. Steel plate (500
X150 × 9mm) is grit blasted, coated with an organic primer, and then coated with polyurethane resin to a film thickness of 2.5m.
m was spray-painted to form an anticorrosion coating layer. After the anticorrosion coating layer is completely cured, a vinyl ester containing glass flakes is coated as the coating layer to a thickness of 2.2 mm (Example 1).
Alternatively, after grit blasting, applying chromate, an organic primer and an adhesive, the polyurethane resin is applied with T
Extrusion coating with a die to a film thickness of 2.5 mm and after coating 1
2 ~ 25μm diameter as flocking material when uncured for ~ 3 minutes,
Inorganic fibers having a length of 2 to 10 mm are sprinkled, and after the anticorrosion coating layer is completely cured, a glass flake-containing vinyl ester is coated as the coating layer to a film thickness of 2.2 mm (Example 2).
Furthermore, after applying an adhesive to the same anticorrosion coating layer as in Example 1,
A polyurethane protective layer was formed (Example 3). Roll has a stroke length of 300 mm, roll 100Φ × 10
Table 1 shows the evaluation results of the number of strokes, the film state, etc. when a resin of 0 mm thickness was applied and a load of 30 t was applied using a test evaluation device. As can be seen from these results, in the present invention, the number of strokes is much larger than that of the comparative example, and the covered state and the rolled state are maintained in a healthy state.

[0014]

[Table 1]

[0015]

As described above, by harmonizing the hardness of the steel pipe pile and the resin roller according to the present invention, by clarifying the relationship between them, the durability can be improved, which is an extremely excellent effect. It is a thing.

[Brief description of drawings]

[Fig. 1] Schematic of the floating pier

FIG. 2 is an explanatory view of a high-strength steel pipe pile for a floating pier according to the present invention.

FIG. 3 is a detailed cross-sectional view showing a support structure for a floating jetty.

FIG. 4 is a partial cross-sectional view of a heavy anticorrosion coating material for a steel pipe pile.

[Explanation of code] 1 Steel pipe pile 2 Coast 3 Ship 4 High-strength coating layer 5 Cushion material 6 Protective material 7 Floating pier 8 Resin roller 9 Base treatment layer 10 Anticorrosion coating layer 11 High-strength protective layer

Claims (1)

[Claims] 1. An outer surface-coated steel pipe pile in which a base treatment layer, an anticorrosive coating layer, and a high-strength protective layer having a coating hardness Shore D hardness of 55 or more are sequentially laminated as a support pile, and a Shore D hardness of 35 to 50.
A support structure using an outer surface coated steel pipe pile of a floating pier, characterized in that the resin roll is attached to the floating pier and held in contact with the supporting pile.