JPS6043478B2 - Corrosion prevention treatment method for cables - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for anticorrosion treatment of cables used in suspended structures and the like.

Conventionally, in order to prevent corrosion of cables used in suspended structures, cable-stayed bridges, etc., after the cable is inserted into a plastic or metal cladding tube, the gap between the inner surface of the cladding tube and the cable is grouted. However, it is very difficult to fill this narrow gap with grout over the entire length, and the size of the gap is uneven over the entire length, so the grout layer is difficult to fill. There were also variations in the thickness of the steel, and in these respects it was not possible to achieve a complete anti-corrosion effect.

In addition, in the earth anchor method and rock anchor method, a method is used in which cables are bundled at regular intervals with cable bands or spacers, and then inserted into a metal pipe embedded in concrete and then grouted.
According to this, the gap between the cable and the inner surface of the metal tube can be maintained almost uniformly over the entire length by the cable band and spacer, but special measures are required because the band and the like become an obstacle when pouring grout. This has become one of the problems as it requires high cost and high cost. In view of the above points, the present invention is capable of filling the gap between the cable and the inner surface of the cladding tube with grout material throughout the entire length and with a uniform thickness.
The object of the present invention is to obtain a method of anticorrosion treatment for cables that can provide reliable anticorrosion effects. Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a cable, around which a cable 2 such as a wire rope, stranded steel wire, or fiber rope is wound in a spiral manner.

Reference numeral 3 denotes a cable sheathing tube made of plastic or metal such as polyethylene or vinyl chloride, into which the cable 1 is inserted.

In this state, a gap 4 is formed between the cable 1 and the inner surface of the cladding tube 3; 4 is formed to have uniform dimensions over the entire length. Moreover, since the cable 2 is spirally wound around the cable 1, the gap 4 is formed in the shape of a continuous spiral groove along the length of the cable. Moreover, the rope 2 effectively plays the role of a cable band and prevents the cable strands from coming undone.
After the cable 1 is inserted into the cladding tube 3 in this manner, a grouting material 5 such as mortar, grease, or synthetic resin is injected and filled into the gap 4 formed between the cables 1 and 3.

The injection timing and injection port position of this grout material 5 vary depending on the use of the cable. For example, in the case of a cable used as a hanging material, the cable 1 is inserted into the cladding tube 3 and then erected at a predetermined position. After that, a grout material 5 is injected from below through a grout hole (not shown) provided in the cladding tube 3. In this case, since the cavity 4 is formed in a spiral groove shape by the cables 2 as described above, the injected grout 5 flows through the cavity 4 without receiving any resistance. As shown by the arrow in the figure, it flows smoothly in a spiral shape and is efficiently filled. Therefore, it is possible to completely fill the gap 4 with the grout material 5 throughout the entire length. Further, since the void portion 4 is formed to have a uniform size over the entire length by the same cable 2, the grout layer can be formed to have a uniform thickness over the entire length. Therefore, the corrosion prevention effect of the cable 1 can be reliably achieved.
The diameter of the cable 2 is selected in accordance with the size of the cavity 4 to be formed, that is, the difference between the outer diameter of the cable and the inner diameter of the cladding. Needless to say, it is selected depending on the purpose of the cable.

In addition, the spiral pitch of the cable 2, in other words, the width of the spiral groove that serves as a flow path for the grout 5, is determined depending on the size of the gap 4, the material of the grout 5, etc., so that the grout 5 can flow as smoothly as possible. You can choose as appropriate.
As described above, according to the present invention, by winding the cable in a spiral around the outer circumference of the cable, a gap having uniform dimensions is formed in the shape of a spiral groove over the entire length between the cable and the inner surface of the cladding tube. Therefore, the gap can be completely filled with the grout material over the entire length and at a uniform thickness, thereby ensuring a reliable anti-corrosion effect.

Further, according to the present invention, the structure is simple, it can be implemented very easily at a construction site, etc., and it is highly reliable, so it is highly versatile and has very high practical value.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is a perspective view of the cable, FIG. 2 is a partial vertical sectional view of the cable in a state of anti-corrosion treatment, and FIG. 3 is a cross sectional view thereof. 1...Cable, 2...Cable, 3...
...Claying tube, 4...Gap, 5...
- Grout material.

Claims (1)

[Claims] 1. By wrapping the cable in a spiral shape around the entire length of the cable and inserting the cable into the cladding pipe, the cable creates a uniform bond between the cable and the inner surface of the cladding pipe over the entire length. 1. A method for anti-corrosion treatment of cables, which method comprises forming a cavity, and injecting and filling the cavity with grout material along the spiral direction of the cable.