JPS6017905B2 - Bottom sealing method for corrosion-resistant cover for sheet piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for sealing the bottom of a corrosion-resistant cover for sheet piles.

As is well known, sheet piles are used for bank protection work, etc., and as shown in FIG. 1, a plurality of steel pipes 1 are driven into the seabed and connected together at joints 2. As can be seen from the figure, one joint is welded to each steel pipe, and these joints are aligned or parallel to each other. There are various types of joints other than these. To protect these sheet piles from corrosion, there are two methods: one is to partially remove the joints and cover each steel pipe with a cylindrical cover, and the other is to install a continuous cover along one side of the steel pipe sheet piles, as shown in Figure 1. There is. The latter is more advantageous in terms of construction effort and cost, but there is a problem with the seal near the joint. It would seem that the sealing problem could be solved by welding a metal shaped like the imaginary line at the bottom of Figure 2 to the joint and steel pipe, but in reality it is impossible to align each steel pipe in a straight line. Close to.

In other words, if adjacent steel pipes are misaligned, the shape of the metal changes each time, making it impossible to mass-produce pipes of the same shape in advance. The present invention has been made to solve this problem, and aims to provide a sealing method that allows installation of steel pipes no matter which direction the steel pipes are shifted in position.

Since each steel pipe is connected by a joint, the only possibility of misalignment is between the joints that are joined together. Since the steel pipe and the joint are integrated by welding, there will be no misalignment at all. In other words, since the shapes of the sealing metal plates in contact with this surface are all the same, mass production is possible. Therefore, the focus of countermeasures is focused on the misalignment between each joint. For this reason, in the present invention, a method is adopted in which the metal plate for sealing is divided and attached, and then both are fixed. Embodiments of the present invention having such characteristics will be described in detail below with reference to the accompanying drawings. FIG. 2 is a perspective view of a corrosion-resistant cover near a joint of a steel pipe sheet pile.

A pipe-shaped guide 4 is welded to the joint 2, and its length is approximately equal to the corrosion-resistant cover 3. Further, a slit 5 is formed on the outside of the guide 4 over the entire length. On the other hand, the corrosion-protective covers 3, 3 are each connected by a fitting 6 having a T-shaped cross section, and as a whole form a continuous surface as shown in FIG. As can be seen from the figure, the end faces of each cover are clamped by the fixtures 6 and then bolted. The distal end of the fixture 6 is bulged, and this portion 7 is inserted into the front magazine guide 4 from above. As can be seen from FIG. 3, the bottom part 3a of the corrosion-protective cover is curved inward and is in contact with the steel pipe through a seal, so sealing this part is not so much of a problem. The remaining area near the joint is sealed as follows.

As shown in FIG. 3, first a pair of sealing metal plates 8a, 8
b is manufactured in advance at a factory. Since the sheet pile joining surfaces of each of the metal plates 8a and 8b, that is, the curved surfaces, are always constant, there is no need to adjust the dimensions on site. The metal plates 8a and 8b do not necessarily have to be symmetrical, but in consideration of mass production, it is desirable that they have the same shape. It is normal for the angle of the joint iron part to vary somewhat depending on each connection part, but since there is a gap S between the metal plates 8a and 8b even after they are welded in place, there is no problem when installing them. do not have. In other words, it is only necessary that the magnitude of S differs depending on each connection part of the joint. As a second step, a metal plate 8c having a center sufficient to cover the gap S is prepared, and the angle of the tip 9 of the metal plate 8c is formed to be approximately equal to a. Although the angle of the joint formation differs somewhat depending on each joint, even if the tip 9 of the metal plate is not so accurate, it can be sufficiently handled at the welding stage. Figure 4 shows the state after welding. 8 is limited in its range by the iron fitting of the joint 2, and therefore it will be sufficient to manufacture the same shape of the metal plate 8c.

The sealing metal plates 8a, 8b, and 8c are generally made of mild steel, but other metal materials may be used as long as they can be welded. Kugime 1
After sealing the periphery with the bottom 3a of the corrosion-resistant cover and sealing the vicinity of the joint 2 with the metal plates 8a, 8b, and 8c, the cover is filled with mortar or the like and solidified to complete the construction.
As described above, according to the sealing method of the present invention, it is possible to sufficiently deal with any problems that may occur with steel pipes or joints, and to obtain a perfect sealing effect.

[Brief explanation of drawings]

Figure 1 is a plan view of the steel pipe sheet pile, Figure 2 is a perspective view, Figure 3 is
FIG. 4 is an enlarged plan view of the seal near the joint. 1... Steel pipe, 2... Fitting, 3...
...Corrosion-proof cover, 4...--Guide, 6...Cover installation odor, 8a, 8b, 8c...Metal plate for sealing, 0...Angle of joint conflict area, S...Gap between metal plates. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. To seal the facing steel pipes and the side where the corrosion protection cover is attached near the joint that connects both steel pipes, a metal plate that fits the joint and the steel pipe surface near the joint is formed, and then this metal plate is used to seal the part that corresponds to the fitting part of the joint. It is characterized in that the metal plates are divided at the positions where the steel pipes are attached and then fixed to each steel pipe side, and the gap between the two metal plates and the corrosion-resistant side of the joint fitting portion are closed by another metal plate, and the plurality of metal plates are connected. A method for sealing the bottom of a corrosion-resistant cover for sheet piles.