JPS6227210B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to a corrosion-resistant structure for steel sheet piles constructed as sheet piles for revetment of quay walls. [Background technology] Steel sheet piles are generally constructed as sheet piles for quay wall protection, but these steel sheet piles are susceptible to corrosion when exposed to seawater, especially in the area between high tide and low tide called the splash zone. Corrosion is likely to occur in areas exposed to seawater splashes due to repeated contact with seawater and oxygen in the air, and it is therefore necessary to perform anti-corrosion treatment on these areas. Therefore, conventionally, glass fiber reinforced cement plates (GRC
The steel sheet piles were installed on the surface of the steel sheet piles and mortar was poured between the GRC plates and the steel sheet piles to prevent the steel sheet piles from being exposed to seawater and provide corrosion protection. However, GRC plates have a high specific gravity of 1.9 to 2.3 and are heavy, so they are used to make steel sheet piles under difficult conditions such as underwater and offshore environments.
There is a problem in that the work of installing GRC boards is extremely difficult, and since it is necessary to prepare and pour mortar on-site, large-scale equipment must be brought to the site, making the work large-scale. There was also the problem that the In addition, it is virtually impossible to process GRC boards in two pieces, making it impossible to cut or drill holes on site, making it difficult to install them accurately according to the site conditions, and making repairs difficult. There was also the problem that it could not be done. [Object of the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a corrosion-resistant structure for steel sheet piles that does not require the use of large-scale equipment and can be easily worked. That is. [Disclosure of the Invention] However, the corrosion-resistant structure of steel sheet piles according to the present invention has the following features:
A bolt 2 is provided protruding from the front side of the flat bar 17 to form a fixture 3, and a welding hole 18 is bored in the flat bar 17. The flat bar 17 is provided on the surface of the steel sheet pile 1 and the inside of the welding hole 18 is formed. The fixture 3 is fixed to the steel sheet pile 1 by welding on the periphery, and the cover plate 4 made of glass fiber reinforced thermoplastic resin is placed between the front surface of the steel sheet pile 1 and the back surface of the cover plate 4 with a corrosion-resistant material 5. Lay it on the surface of the steel sheet pile 1 in a clamped state,
The first invention is characterized in that the bolt 2 is passed through a through hole 6 formed in the cover plate 4 and a nut 7 is fastened to the bolt 2.
At the same time, a bolt 2 is provided protruding from the front side of the steel plate 7 to form a fixture 3, and a welding hole 18 is bored in the flat bar 17. Welding hole 18
The fixture 3 is fixed to the steel sheet pile 1 by welding on the inner peripheral edge of the steel sheet pile 1, and a plurality of cover plates 4, 4, . The cover plates 4 are stacked on the surface of each steel sheet pile 1 with the corrosion-resistant material 5 clamped between them.
A through hole 6 is bored in the side end of the cover plate 4, and the side ends of the adjacent cover plates 4, 4 are overlapped, and the through hole 6, 6 of both cover plates 4, 4 is passed through the corresponding bolt 2. The second invention is characterized in that a nut 7 is fastened to the bolt 2, and the above object is achieved with this configuration. Explain in detail. In the present invention, the cover plate 4 is made of a glass fiber reinforced thermoplastic resin, and among the glass fiber reinforced thermoplastic resins, glass fiber reinforced vinyl chloride resin (FRV) is most preferably used. FRV has excellent chemical resistance, and has good durability against corrosive liquids such as seawater.Furthermore, because it has glass fibers in its length and width, it is a material that is strong against impact and does not easily crack, especially in low-temperature environments. There is nothing to worry about. Here, it is possible to use a cover plate 4 made of glass fiber reinforced thermosetting resin (FRP), but as shown in the following table, the strength of FRP is not much different from that of FRV, and FRP is It has a higher specific gravity than FRV, is heavier, has poor workability, and has poor workability and is expensive when molding FRP.
FRP is virtually impossible to perform secondary processing, cutting or drilling on site is not possible, it is difficult to accurately install protective covers depending on the site conditions, and repairs are not possible. Therefore, in the present invention, the cover plate 4 is formed of a glass fiber-reinforced thermoplastic resin, of which FRV is a representative example.

〔Effect of the invention〕

As described above, according to the present invention, the anti-corrosion material is pressed onto the surface of the steel sheet pile using the cover plate made of glass fiber-reinforced thermoplastic resin, so the cover plate made of glass fiber-reinforced thermoplastic resin is different from the conventional cover plate made of glass fiber-reinforced thermoplastic resin. It is extremely lighter than the GRC board used in the previous model, making it easier to install the cover board under difficult conditions under the sea or on the surface of the sea. There is no need to do so. In addition, the cover plate made of glass fiber-reinforced thermoplastic resin is flexible and easily adheres to anti-corrosion materials. It can be easily processed and repaired as necessary, and the cover plate that protects the corrosion-resistant material can be accurately attached to the steel sheet pile, preventing the corrosion-protective material from being washed away by seawater. Furthermore, since the mounting tool with bolts protruding from the front side is fixed to the surface of the steel sheet pile, and the cover plate is attached using the bolts of this mounting tool, it is possible to prevent The cover plate can be attached to the existing steel sheet pile without the need for any special processing on the existing steel sheet pile. Also, when welding the flat bar of the fixture to the steel sheet pile, if the side ends of the flat bar are welded, the welding work must be performed diagonally, and this work will cause the flat bar to protrude to the front side beyond the flat bar. This is often difficult due to the presence of steel sheet piles, but since welding holes are drilled in the flat bar and welding is applied to the inner periphery of the welding holes, the fixtures are fixed to the steel sheet piles. Welding work can be carried out from the front through the welding holes drilled in the flat bar, making it easy to weld and secure the fixtures to the steel sheet piles. In addition, in the second aspect of the present invention, when attaching a plurality of cover plates to a steel sheet pile connected in parallel, the side ends of adjacent cover plates are overlapped and both sides are stacked. Since the holes in the cover plate are passed through the bolts of the fixture and the nuts are fastened to the bolts, the fixture can be used in common for connecting the cover plates to each other and for attaching the cover plate to the steel sheet pile. , the structure can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of an embodiment of the present invention, FIGS. 2 a and b are a front view of the same and a sectional view taken along line AA in FIG. 1, and FIGS. 3 a and b are B in FIG. 1. - Enlarged sectional view of line B and line C--C, Figure 4 a, b, c is a side view showing construction, plan sectional view, side view, Figure 5 a, b, c, d.
e, f are diagrams showing the manufacture of the cover plate, Fig. 6 a, b
are a front view and an enlarged view of the fixture. 1 is a steel sheet pile, 2 is a bolt, 3 is a fixture, 4 is a cover plate, 5 is a corrosion-resistant material, 6 is a through hole, and 7 is a nut.

Claims (1)

[Scope of Claims] 1. Bolts are provided protruding from the front side of the flat bar to form a fixture, and a welding hole is bored in the flat bar, and the flat bar is arranged on the surface of the steel sheet pile to form the inner peripheral edge of the welding hole. Fixtures are fixed to the steel sheet pile by welding, and a cover plate made of glass fiber reinforced thermoplastic resin is attached to the steel sheet pile with a corrosion-resistant material sandwiched between the front side of the steel sheet pile and the back side of the cover plate. A corrosion-resistant structure for steel sheet piles, characterized in that the above-mentioned bolts are passed through holes formed in the cover plate and fastened to the bolts with nuts. 2. The corrosion-resistant structure for steel sheet piles according to claim 1, wherein the glass fiber-reinforced thermoplastic resin is a glass fiber-reinforced vinyl chloride resin. 3. A corrosion-resistant structure for steel sheet piles according to claim 1 or 2, wherein the main component of the corrosion-resistant material is petrolatum. 4 Bolts are protruded from the front side of the flat bar to form a mounting fixture, and welding holes are drilled in the flat bar, and a flat bar is placed on the surface of each connection part of multiple steel sheet piles that are connected in parallel. Fix the fixture to the steel sheet pile by welding the inner edge of the welding hole,
A plurality of cover plates made of glass fiber-reinforced thermoplastic resin are stacked on the surface of each steel sheet pile with a corrosion-resistant material sandwiched between the front surface of the steel sheet pile and the back side of the cover plate, and each cover plate is A through hole is bored in the side end portion, the side end portions of adjacent cover plates are overlapped, and the corresponding bolt is passed through the through hole of both cover plates, and a nut is fastened to the bolt. Corrosion-resistant structure of steel sheet piles.