JPS5856769B2 - Corrosion prevention device for steel sheet pile partitions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrosion protection device for steel sheet pile partitions.

Steel sheet pile partitions are used for earth retaining, closing, etc., but because they come into direct contact with seawater on one side opposite to the side where earth and sand is backfilled, they are not susceptible to moisture due to water level fluctuations, taking into account the ebb and flow of the tide as well as the general wave height. It is constantly exposed to alternating dry and wet environments due to heat and water droplets splashed by wind waves, making it susceptible to corrosion. Conventional corrosion protection for steel sheet piles was mainly done by painting with anti-corrosion paint, but this method was particularly difficult to maintain. Not only is this undesirable, but painting before pouring the steel sheet piles may cause peeling or damage to the coating during the pouring, and painting after pouring is troublesome as it necessitates underwater work, including repair and repainting. It is.

The present invention aims to provide a novel anti-corrosion device which is suitable for driving rows of steel sheet piles having a U- or double-shaped cross section among various shapes of steel sheet piles, and having joints on the side edges for connecting adjacent sheets. This is the purpose.

In other words, the present invention provides a method for installing steel sheet piles on one side of an underwater cast row of steel sheet piles having a U or double-shaped cross section and having joints at the side edges for connection between adjacent ones, at least over the upper and lower limits of the water level fluctuation. It has an anti-corrosion cover disposed at a distance from one side, and this anti-corrosion cover serves as a joint for connecting a plurality of unit face plates between adjacent ones along the pouring row.
The side edges of adjacent unit face plates are provided with locking edges that are bent in two steps in directions that are recurved from each other, and the first bent areas of these locking edges are butted against each other so that they project away from each other. A corrosion protection device for a steel sheet pile partition, which is formed by restraining the second bent end of the steel sheet pile with a receiving claw and combining it with an underwater cast row of steel sheet piles by filling the space between the one side and the corrosion protection cover with filler. be.

In this invention, one side of the underwater driving row of steel sheet piles is covered as a corrosion-proof cover, and the one side and the space are filled with filler to combine with the underwater driving row of steel sheet piles. In addition to being much more effective in preventing corrosion and having high long-term reliability, the addition of new features to the connecting joints of the anti-corrosion cover makes it easy to install.

This invention will be explained below based on the drawings.

FIG. 1 shows a horizontal section of a steel sheet pile to which the anti-corrosion cover of the present invention is applied, and FIG. 2 is a perspective view.

In the figure, 1 is a U-shaped steel sheet pile cast in rows underwater, 2 and 3 are unit face plates used for anti-corrosion covers, and in the illustrated example, unit face plates 2 and 3 are rows of steel sheet piles 1 cast underwater. The case is shown in which two sizes are used to cover the protruding peaks and the concave valleys on one side of the screen.

In the illustrated example, the unit face plates 2 and 3 that constitute the anti-corrosion cover have locking lines 2a, 2a', and 3a bent in two steps toward the steel sheet pile 1 at both side edges of a U-shape.

3a', and among these two types, the unit face plate 2 is the steel sheet pile 1
The above-mentioned locking edges 2a, 3a, 2a' are arranged alternately on the protruding chevron-shaped convex portions on one side that are to be protected against corrosion in the underwater pouring rows, and on the concave valley portions of the unit face plates 3.

3a', and the second bent edges projecting away from each other are in this example steel sheet piles 1.
The case where the joint is restrained by a pair of protruding claws 4 and 4 is shown.

In this way, the unit face plates 2 and 3 jointed together along the underwater pouring row of the steel sheet piles 1 are combined with the above-mentioned pouring row by keeping the interval between each steel sheet pile 1 constant and filling this interval with filler. .

In addition, in order to prevent the anti-corrosion cover thus formed from swelling, the spacer 5 which has been properly fixed to one side of the steel sheet pile 1 by welding or the like may be secured by bolting or the like.

Considering the variations in the driving pitch of the steel sheet piles 1 in the illustrated example, it is preferable that the unit face plates 2 and 3 be made of a material that can absorb some deviation in the spacing between the receiving claws 4° and 4' and has appropriate flexibility. In particular, since it is necessary to have electrical insulation properties from the viewpoint of anti-corrosion performance, a molded body of fiber reinforced plastic (FRP), for example, can be suitably used.

It goes without saying that this anti-corrosion cover should be provided on one side of the row of steel sheet piles 1 over an area necessary to cover at least the upper and lower limits of water level fluctuations.

Mortar, concrete, etc. are generally suitable for the above-mentioned filling, but in order to prevent the anti-corrosion cover from falling off due to its weight, a falling-off prevention member 6 is installed below the steel sheet pile 1 in advance as shown in Fig. 2. If the spacer 5 extends to the lower limit of the corrosion protection area, it may be formed at the lower end, but since the spacer 5 may not necessarily reach the lower limit, in that case, it may be fixed directly to the steel sheet pile 1. ○ The lower parts of the unit face plates 2 and 3 that are not shown in the above illustrations are
As shown in perspective in Figures a and b, bottom plates 21 and 31 are provided at their bottom ends to prevent the filling from falling off.

Note that a flexible material such as an elastic sheet may be placed on these bottom plates to further improve sealing performance.

In FIG. 3, 22, 22' or 32' and 32 not shown in the figure are notches cut into the bottom plates 21 and 31 for fitting with the receiving claws 4 and 4'.

An example of how to arrange and lock this anti-corrosion cover on the driving row of the steel sheet pile 1 is as shown in Fig. Locking edges 2a and 2a' on both sides of 2 and 3 and 3a and 3
Insert a' from above and push down until it reaches the drop-off prevention member 6 fixed in advance.

In addition, when applying to existing steel sheet piles with crown concrete poured at the top, it is impossible to fit them in by dropping them from above, so in this case, it is necessary to work from the bottom to the top, although sometimes it is difficult to work underwater. Just push it up and lock it in the same way.

Another way to arrange and lock the anti-corrosion cover on the steel sheet pile 1 is to install spacers 5' especially towards the face plate as shown in Figure 3.
, 5" may be fixed, and this spacer 5' may be fixed to the steel sheet pile 1 by welding or the like at a predetermined position on the steel sheet pile 1. In this case, the joining member 41 (see FIGS. 1 and 2) Insert the separate receiving claws 4, 4', which have been integrated in advance, across the abutting edges of the adjacent unit face plates 2 and 3, and then insert the roots of the receiving claws 4, 4'. This is a method similar to retrofit welding to the steel sheet pile 1.

In this case, the catch claws are arranged at least on the sleeve, at both ends, and if necessary in the middle part, and in order to weld these catch claws to the steel sheet pile 1, unit face plates 2, as shown in FIG.
It is preferable to provide welding windows 23 and 33 on the side surfaces of 3 as necessary, and to close these windows with blind plates after welding.

The application of the present invention to a U-shaped steel sheet pile has been described above. In this case, the unit plate 2.3, which has a roughly U-shaped cross section, has a tapered shape that widens toward the opening, whereas it has a Z-shaped sheet pile as shown in FIG. For shaped steel sheet piles, it may be in the form of a channel with parallel side walls on both sides.

In addition, in order to improve the adhesion with mortar, it is preferable to form a plurality of dowel lines on the steel sheet pile and optionally attach spacers to the inner surface of the anti-corrosion cover. The protective effect of the anti-corrosion cover on one side of the underwater pouring row can be significantly enhanced, and the construction can be significantly simplified.

[Brief explanation of drawings]

Fig. 1 is a horizontal sectional view of the anti-corrosion cover of the present invention, Fig. 2 is an external view of the anti-corrosion cover of the invention, Fig. 3 a and b are external views of the face plate for the anti-corrosion cover, and Fig. 4 is an external view of the anti-corrosion cover of the present invention. FIG. 7 is a horizontal cross-sectional view of another embodiment. 1... Steel sheet pile, 2, 3... Face plate for anti-corrosion cover, 4.4'... Claw catch, 4a, 4a'...
... hooked edge, 2a. 2a', 3a, 3a'...Locking edge.

Claims (1)

[Claims] 1. On one side of an underwater cast row of steel sheet piles having a U or 2-shaped cross section and having joints at the side edges for connection between adjacent ones,
A corrosion protection cover is provided at least between the upper and lower limits of the water level fluctuation and is spaced apart from the one side, and the corrosion protection cover also covers a plurality of unit face plates adjacent to each other along the pouring row. As a joint connecting between the two, locking edges are provided at the side edges of adjacent unit cylindrical plates to form two-step bends in directions that are recurved to each other, and the first bent areas of these locking edges are brought into contact with each other. A steel sheet pile partition formed by restraining the second bent end projecting apart with a receiving claw and combining with an underwater cast row of steel sheet piles by filling the space between the one side and the anti-corrosion cover with filler. anti-corrosion equipment.