JPH0355617B2 - - Google Patents

Description

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

BACKGROUND ART Conventionally, steel sheet piles coated with resin to improve 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 in order to eliminate such drawbacks, and it not only forms a primary coating layer with a desired thickness in terms of anti-corrosion performance by heating and fusing powdered resin on the surface of steel sheet piles, but also provides an impact-resistant layer on top of the primary coating layer. It is an object of the present invention to provide a resin-lined steel sheet pile provided with a secondary coating layer that improves durability and wear resistance.

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.
has a primary coating layer 2 applied to its surface. The primary coating layer 2 is formed by heat-sealing powdered resin as will be described later, and is formed to have a desired thickness to exhibit the desired anticorrosion properties. however,
A primary coating layer 2A formed on the fitting surface of a joint part 1A that fits into a joint part of another steel sheet pile to connect the steel sheet piles.
is thinner than the primary coating layer 2B of other parts, and has a thickness that does not interfere when fitting the joint part 1A to a joint part of another steel sheet pile. In addition, when the thickness of the primary coating layer 2 is relatively thin and does not interfere with the fitting of the joint part, or when the fitting gap of the joint part is large and there is no problem even if a thick coating layer is formed, The thickness of the joint and other parts may be uniform. In some cases, the primary coating layer on the fitting surface of the joint may be omitted.

Further, on the primary coating layer 2, a secondary coating layer 4 is formed by fusing resin pellets 3 of the same type or different types to be fused with each other, except for at least the fitting surface of the joint portion. Since this secondary coating layer 4 has many irregularities, it plays the role of a cushion when other objects collide with it, and it not only greatly improves the impact resistance of the steel sheet pile and its coating layer, but also improves its wear resistance. This prevents the coating layer from being worn or peeled off when driving steel sheet piles into the ground.
Further, the secondary coating layer 4 has a large coefficient of friction, and therefore works to prevent the risk of the steel sheet piles slipping and falling when handling the steel sheet piles.

The primary coating layer 2 and the secondary coating layer 4 of the above structure may be formed over the entire length of the steel sheet pile 1, or may be formed partially as necessary. Furthermore, the thickness of each coating layer does not need to be uniform over the entire length, and can be changed as appropriate, such as by increasing the thickness in areas where corrosion is likely to occur. Furthermore, the primary coating layer 2 is not limited to being heat-fused directly onto the steel surface of the steel sheet pile 1;
Metal spraying, hot-dip plating,
A primer or the like may be applied and heat fused thereon. In this way, the anti-corrosion layer becomes double, and the anti-corrosion properties are improved.

Next, a method for forming the primary coating layer and the secondary coating layer will be explained.

First, a steel sheet pile whose surface has been subjected to a predetermined surface treatment is heated to a temperature higher than the melting point of the powdered resin using a furnace, gas burner, electric heater, high-frequency heating coil, or the like. 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 powdered resin 10 is placed in the fluidization tank 11.
A heated steel sheet pile 1 is immersed in a diagonally suspended state, and then held in a resin 10 either obliquely or horizontally. In addition, steel sheet pile 1 is dipped diagonally.
This is to prevent air from accumulating on the underside of the resin and creating areas where the resin does not come into contact. 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, lift the joint part 1A of the steel sheet pile horizontally and
exposed outside. Thus, after this, the joint part 1A
Heat fusion of the granular resin to other parts continues except for the parts. After the desired film thickness has been formed, the steel sheet pile 1 is taken out as shown in Fig. 2C, and the steel sheet pile 1 is rotated from 90 degrees as shown in Fig. 2D.
Rotate about 180 degrees to remove the resin inside. Through the above operations, a thin primary coating layer 2 is formed on the joint portion 1A.
A, and a thick secondary coating layer 2B is formed in other parts.

Next, while the steel sheet pile 1 and the primary coating layer 2 thereon are still at a high temperature, or after being heated again, the steel sheet pile 1 is suspended as shown in FIGS. 3A to 3C, and resin pellets are formed while rotating. Sprinkle with 3. This resin pellet 3 retains its original shape as appropriate,
It is partially fused to the primary coating layer 2 to form a secondary coating layer. Surplus resin pellets 3 fall naturally and are collected. The steel sheet pile on which the primary coating layer and the secondary coating layer have been formed is subjected to appropriate post-treatments, such as reheating, crosslinking reaction, cooling, etc., depending on the resin used, to become a product.

Note that the above method is for forming a primary coating layer with a reduced thickness at the joint, but when forming a primary coating layer with a uniform thickness,
It is sufficient to simply immerse the steel sheet pile 1 in the resin for a predetermined time and then take it out. In addition, if the joint part 1A does not require a primary coating layer, the joint part 1A may not be heated, or a method of preventing adhesion of powdery resin may be taken. Formation of the primary coating layer is not limited to dipping in a fluidized bath, but can be performed using any other method, such as those shown in Fig. 3A.
A method of sprinkling powdered resin as shown in FIG. 3C may also be used. Furthermore, the primary coating layers for the joint portion and other portions may be formed using different methods. For example, a thick primary coating layer on the other parts except for the joint part may be formed by dipping, and a thin primary coating layer on the joint part may be formed by electrostatic coating of powdered resin. This method has the advantage that the primary coating layer of the joint can be formed to have a more uniform thickness. In this case, the resin forming the thin coating layer of the joint may be of a different type as long as it completely fuses with the resin of the thick coating layer of other parts, and the resin forming the thin coating layer of the joint may be of a different type, taking into account the coefficient of friction and wear resistance. It is preferable to use resin.

FIG. 4 shows still another method of forming the primary coating layer and the secondary coating layer. In Figure 4,
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 fluidization tank 14 containing granular resin 10,
A resin pellet spraying device 15 and a cooling device 16 are arranged. As shown in FIG. 5, an opening 14A slightly larger than the cross-sectional shape of the steel sheet pile 1 is formed on the side surface of the fluidization tank 14 to allow the steel sheet pile to pass through. A suitable brush or air nozzle is provided in the opening 14A to prevent leakage of the powdered resin inside. In addition, the fluidized tank may be made into a double tank to recover and circulate the leaked powder resin. The heating device 13 is designed to keep the joint portion 1A of the steel sheet pile 1 at a lower temperature than other portions. In the apparatus shown in FIG. 4, 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. In this way, the primary coating layer 2 is formed on the surface of the steel sheet pile exiting the fluidized tank 14, which is thin at the joint portion but thick at other portions. Next, resin pellets are sprayed onto the primary coating layer 2 by the spraying device 15 to form a secondary coating layer in which a portion of the resin pellets are fused, and then cooled to form a product. 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 carrying out the above method, the steel sheet pile 1 does not necessarily have to pass through the fluidization tank 14 horizontally, but may pass diagonally or vertically. Also,
The orientation of the steel sheet pile 1 is also the joint part 1A as shown in FIG.
It is not limited to the case where the top is on the top, and can be changed as appropriate. Furthermore, a heating device may be provided between the fluidized tank 14 and the spraying device 15 to reheat the steel sheet pile having the primary coating layer.

The lining method shown in FIG. 4 allows continuous lining of steel sheet piles, and by connecting the steel sheet piles one after another, any number of steel sheet piles can be lined continuously, making it 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. 4, 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.

Polyethylene, polypropylene, polyester, nylon, vinyl chloride, urethane, epoxy resin, etc. can be used as the granular resin used for the primary coating layer of the resin-lined steel sheet pile of the present invention, and these resins can be used in the granular state to coat the steel sheets. in contact with the sheet pile surface,
It may be a thermoplastic resin or a thermosetting resin as long as it can be heat-fused. Furthermore, after the coating layer is formed, a type of resin that can be crosslinked by an appropriate treatment and improve physical properties such as heat resistance and abrasion resistance, such as water crosslinking of polyethylene, can be used after coating with the above method. It may be in a form where crosslinking is promoted when immersed in water, crosslinked by absorbing moisture during use, or crosslinked by peroxide or radiation. The resin pellets used for the secondary coating layer can be of the same type as the primary coating layer, but are not limited to the same type, and may be of different types as long as they fuse together. The size of the resin pellets is preferably 1 to 3 mm. Also,
Steel sheet piles are not limited to those with the cross-sectional shape shown in FIG. 1, and can be modified in various ways, and in this specification, steel sheet piles also include so-called steel pipe sheet piles in which joints are fixed to steel pipes.

As described above, the resin-lined steel sheet pile according to the present invention has a primary coating layer formed by heat-sealing powdered resin on the surface, and this primary coating layer can be applied to various curved steel sheet pile surfaces. Since it can be formed to a desired thickness and can also be formed on the fitting surface of the joint, it has extremely excellent anti-corrosion properties. Moreover, the primary coating layer on the mating surface provides better slippage than the steel itself, facilitating mating. In addition, the primary coating layer created by heat-sealing 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 extruded. , high peel strength. Furthermore, since the resin-lined steel sheet pile of the present invention has a secondary coating layer formed by fusing resin pellets on the primary coating layer, it has increased impact resistance and abrasion resistance, and is suitable for driving into the ground. Not only does it have a longer lifespan with less peeling and wear, but the surface is rough and non-slip, making it easy to handle. In addition, the unevenness of the secondary cover layer allows the steel sheet piles to stick to the soil better when driven into the soil, firmly fixing the steel sheet piles to the soil, and
When concrete is placed on steel sheet piles, it is firmly fixed to the concrete. Since the steel sheet pile of the present invention has extremely high impact resistance, when used underwater in a river or on the coast, it will not be damaged much even if floating objects such as driftwood collide with it. As described above, the resin-lined steel sheet pile of the present invention has excellent properties.

[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 primary coating layer 2 of the resin-lined steel sheet pile of Fig. 1 by the pickled lining method. 3A to 3C are explanatory diagrams showing the procedure of one method for forming the secondary coating layer 4, and FIG. 4 is an explanatory diagram showing the procedure of one method for forming the secondary coating layer 4. FIG. A side sectional view schematically showing the apparatus used in the method, FIG.
It is an AA arrow view of a figure. 1... Steel sheet pile, 1A... Joint part, 2, 2A, 2B...
Primary coating layer, 3... Resin pellets, 4... Secondary coating layer, 10... Powdered resin, 11, 14... Fluidized tank, 1
3... Heating device, 15... Resin pellet spraying device, 1
6...Cooling device.

Claims (1)

[Claims] 1. A primary coating layer formed by heat-sealing powdered resin on the surface of a steel sheet pile having a joint part,
A resin-lined steel characterized in that it has a secondary coating layer formed by fusing resin pellets of the same type or different types that fuse with each other on the primary coating layer except for at least the fitting surface of the joint portion. Sheet pile.