JPH0355616B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a steel sheet pile whose surface is lined with resin.

Conventionally, steel sheet piles coated with a resin that improves their corrosion resistance have been known. However, the resin coating layer formed by painting is generally thin and not only does not have sufficient anti-corrosion properties, but also has drawbacks such as being weak against impact and easily peeling off. The thickness of the resin coating layer formed by painting can be increased by repeating the coating and drying process, but this process is extremely time-consuming, so in practice, the thickness of the coating layer formed by painting is thin. , which was the drawback mentioned above.

The present invention has been made to eliminate such drawbacks, and aims to provide a resin-lined steel sheet pile in which a resin coating layer of a thickness necessary for anticorrosion performance is formed on the surface of the steel sheet pile.

By the way, steel sheet piles have not only a flat surface but also a curved surface with a small radius of curvature, and for this reason, it is extremely difficult to paste a resin sheet of a predetermined thickness like a normal lining. Moreover, although the steel sheet piles have joints that are fitted together and connected to each other, it is not possible to form a very thick coating layer on the fitting surfaces of these joints due to the fitting operation. As described above, there were difficult problems with resin lining steel sheet piles. The present invention solves these problems by forming a resin coating layer by heat-sealing powdered resin onto the surface of the steel sheet pile.

Hereinafter, the present invention will be explained in more detail with reference to embodiments of the drawings. FIG. 1 is a sectional view showing a resin-lined steel sheet pile 1 according to an embodiment of the present invention.
A resin coating layer 2 is applied to the surface. The resin coating layer 2 is formed by heat-sealing powdered resin as will be described later, and is formed to have a thickness necessary to exhibit desired corrosion resistance, impact resistance, etc. However, the resin coating layer 2A formed on the fitting surface of the joint part 1A that fits into the joint part of other steel sheet piles and connects the steel sheet piles is thinner than the resin coating layer 2B of other parts, and the joint part The thickness is such that it will not cause any problem when fitting 1A to the joint of another steel sheet pile. Note that the resin coating layers 2, 2A, and 2B do not need to be provided on the entire surface of the steel sheet pile 1, and the resin coating layers may be omitted or the thickness may be changed as necessary. Resin coating layer 2
is not limited to the case where the steel surface of the steel sheet pile 1 is directly heated and fused, but the steel surface of the steel sheet pile 1 is pretreated with metal spraying, hot-dip plating, primer, etc., and then heated and fused. may be done. In this way, the anti-corrosion layer becomes double, and the anti-corrosion properties are further improved.

Next, some typical methods of forming the resin coating layer 2 having the above structure will be explained.

(1) Dip lining method for a fluidized tank Steel sheet piles with a specified surface treatment are placed in a furnace,
Heat to above the melting point of the powdered resin using a gas burner, electric heater, high frequency heating coil, etc. At this time, when lining only a portion of the steel sheet pile, only that portion is heated. Next, as shown in FIG. 2A, the heated steel sheet pile 1 is dipped diagonally into the fluidized tank 11 of the powdered resin 10, and then held diagonally or horizontally in the resin 10. do. The reason why the steel sheet pile 1 is immersed in an oblique suspension is to prevent air from being trapped on the lower surface of the steel sheet pile 1 and forming a portion where the resin does not come in contact with the steel sheet pile 1. When the steel sheet pile 1 is kept diagonally or horizontally in the resin 10 for a certain period of time, the granular resin is heated and fused to the surface to a predetermined thickness. Next, as shown in FIG. 2B, the joint portion 1A of the steel sheet pile is exposed outside the resin 10 by lifting it horizontally. Note that the flow may be stopped during fluid immersion. Thereafter, the powder resin is heated and fused to the other parts except for the joint part 1A. After the desired film thickness has been formed, the steel sheet pile 1 is taken out as shown in Fig. 2C, and rotated by about 90 to 180 degrees as shown in Fig. 2D to remove the resin inside, and is then heated if necessary.
Thus, as shown in FIG. 1, a thin coating layer 2A is provided on the joint portion 1A, and a thick coating layer 2B is provided on the other portions.
is formed. In addition, if the coating layer is not required for the joint part 1A, the joint part 1A may not be heated, or a method of preventing the adhesion of powdery resin may be taken.

(2) Continuous lining method Figure 3 schematically shows the equipment used in the continuous lining method. In FIG. 3, the steel sheet pile 1 is continuously conveyed to the left by conveyance rollers 12, and along the conveyance path of the steel sheet pile 1, a heating device 13,
A fluidized tank 14 containing powdered resin 10, a post-heating device 15, and a cooling device 16 are arranged. Fluidization tank 1
As shown in FIG. 5, an opening 1A slightly larger than the cross-sectional shape of the steel sheet pile 1 is formed on the side surface of the steel sheet pile 4 to allow the steel sheet pile to pass therethrough. Opening 14A
A suitable brush or air nozzle is provided to prevent leakage of the powdered resin inside. In addition, the fluidized tank is made into a double tank to recover the leaked powder resin.
May be cycled. The heating device 13 is designed to keep the joint portion 1A of the steel sheet pile 1 shown in FIG. 4 at a lower temperature than other portions. In the apparatus shown in FIG. 3, the moving steel sheet pile 1 is first heated by the heating device 13, and then passes through the fluidization tank 14, where the powder resin is heated and fused to the surface of the steel sheet pile 1. At this time, since the temperature of the joint part 1A is lower than that of other parts, the thickness of the film formed is thinner than that of other parts. The steel sheet pile 1 that has exited the fluidization tank 14 is heated afterward in order to improve the adhesive strength of the resin and to melt the resin, and then cooled by the cooling device 16. As a result, a thin resin coating layer is formed on the joint portion 1A, and a thick resin coating layer is formed on the other parts. Incidentally, if the joint part 1A is not heated and a method is taken to prevent resin adhesion, the joint part 1A can be left uncoated.

In addition, in the said continuous lining method, the steel sheet pile 1 does not necessarily have to pass through the fluidization tank 14 horizontally, but may pass diagonally or vertically. Further, the orientation of the steel sheet pile 1 is not limited to the case where the joint portion 1A is on top as shown in FIG. 5, but can be changed as appropriate. Furthermore, post-heating may be unnecessary depending on the resin and may be omitted.

In the continuous lining method described above, it is possible to continuously line steel sheet piles, and by connecting the steel sheet piles one after another, any number of steel sheet piles can be lined continuously, which is extremely efficient. In addition, the film thickness can be controlled by the moving speed of the steel sheet pile 1, and by intermittent heating by the heating device 13, it is easy to partially heat the steel sheet pile 1 in the length direction and perform partial lining. There are advantages such as:

In Fig. 3, the steel sheet pile 1 has a heating device 13 and a fluidization tank 1.
4, etc., but the steel sheet pile 1 may be kept stationary and the heating device, fluidized tank, etc. may be moved along the steel sheet pile 1. Furthermore, if the amount of heat stored in the steel sheet pile is large, the heating device may be installed only on the inlet side, or if necessary, the heating device may be installed in the fluidized tank.

(3) Electrostatic coating method: Heat the steel sheet pile except for joints that require a thin film.
A resin coating layer is formed by heating and fusing the powdered resin. The resin coating layer may be formed by dipping in a fluidized tank or by a continuous lining method as shown in FIG. Next, powdered resin was electrostatically applied to the steel sheet pile on which a resin coating layer was formed except for the joints.
Then, it is reheated to heat-fuse it. In this way, a thin coating layer is formed on the joint portion, and a thick coating layer is formed on the other portions. With this method, it is possible to form a uniform coating layer even in the gap, and it is also possible to coat the joint with a thin film. Here, the granular resin constituting the thin film may be of a different type as long as it completely fuses with the thick film resin, or may be a resin that takes into account the coefficient of friction and wear resistance.

The powder resin used in the resin-lined steel sheet pile of the present invention includes polyethylene, polypropylene,
Polyester, nylon, vinyl chloride, urethane, epoxy resin, etc. can be used, and either thermoplastic resin or thermosetting resin can be used as long as it can contact the steel sheet pile surface in powder form and be heat-fused. It may be. Furthermore, after the coating layer is formed, crosslinking progresses through appropriate treatment to improve physical properties such as heat resistance and abrasion resistance, such as water crosslinking of polyethylene. Cross-linking is promoted when immersed in water, or cross-linking occurs when water is absorbed during use.
It may be one that causes crosslinking with peroxide. Furthermore, steel sheet piles are not limited to those with the cross-sectional shape shown in Figure 1, and can be modified in various ways. In this specification, steel sheet piles include so-called steel pipe sheet piles in which joints are fixed to steel pipes. It is something that

As described above, since the resin-lined steel sheet pile according to the present invention has a resin coating layer formed by heat-sealing powdered resin on the surface, it can be applied to various curved steel sheet pile surfaces with a desired thickness. A coating layer can be formed, and a coating layer can also be formed on the fitting surface of the joint portion, and has extremely excellent anticorrosion properties. Moreover, since the resin coating layer has a smooth surface and a small coefficient of friction, the resistance when driving the steel sheet pile into the ground is small, making it easy to drive. For example, the coefficient of friction when driving underground is 0.6 for steel, but when coated with polyethylene, it changes to 0.4, improving the efficiency of driving work. Furthermore, since the coating layer on the fitting surface is made thin, not only does it not cause any inconvenience when fitting, but the scarlet coating layer on the fitting surface improves the slippage and facilitates fitting. Furthermore, the resin coating layer created by heating and fusing the powdered resin adheres extremely firmly to the surface of the steel sheet pile regardless of the shape of the steel sheet pile, compared to the case where a resin sheet is attached to the surface of the steel sheet pile or is extruded. It has the advantage of high peel strength and long life.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of a resin-lined steel sheet pile according to an embodiment of the present invention, and Figs. 2A to 2D show the procedure for forming the resin coating layer 2 of the resin-lined steel sheet pile of Fig. 1 by the pickled lining method. 3 is a side sectional view schematically showing an apparatus used in a method for continuously forming a resin coating layer on steel sheet piles, and FIG. 4 is a sectional view of the steel sheet pile 1 in FIG. 3. FIG. 5 is a view taken along the line A--A in FIG. 3. 1...Steel sheet pile, 1A...Joint part, 2, 2A, 2
B... Resin coating layer, 10... Powder resin, 11,
14...Fluidized tank, 13...Heating device, 15...Post-heating device, 16...Cooling device.

Claims (1)

[Claims] 1. In a steel sheet pile having a joint part, a resin coating layer is formed by heat-sealing powdered resin on the surface, and the thickness of the coating layer is made thinner on the fitting surface of the joint part. A resin-lined steel sheet pile featuring: