JP2917113B2 - Corrosion protection structure of steel sheet pile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anticorrosion structure for steel sheet piles used in harbors and seawalls, and more particularly to an improvement of an auxiliary cover for covering a joint portion of a steel pipe.

[0002]

2. Description of the Related Art The ebb and splash area of a steel pipe sheet pile is intensively corroded by the action of a macro battery, so that its sea side is individually covered with a corrosion-resistant cover panel, and the cover panel is filled with mortar or the like. Anticorrosion work is being carried out. In addition, since the joints connecting the steel pipes are also made of metal and are similarly corroded, for example, in the anticorrosion structure of Japanese Utility Model Application Laid-Open No. 45750/1985, a bracket and an angle are fixed to the outer surface of the steel pipe, and a bottom plate is welded to the bottom of the steel pipe. A corrosion-resistant auxiliary cover is dropped from above between the opposing angles.

[0003] However, this kind of anticorrosion structure is effective for new construction, but there is a drawback that the auxiliary cover cannot be inserted from above when the shank concrete has already been constructed on the upper part of the steel pipe as in repair work. .

In Japanese Utility Model Laid-Open No. 63-156237,
A hinge is provided in the center longitudinal direction of the auxiliary cover, and the cover is folded and inserted between the angles from the front and extended again. In Japanese Patent Application Laid-Open No. 55-145210, a semi-cylindrical cylinder is used to seal the gap after the cover is attached. -Shaped auxiliary cover is fixed from the front.

[0005]

However, actual steel sheet piles are not driven at exactly equal intervals.
It is normal for the vehicle to be inclined or displaced.
Auxiliary covers mass-produced in a fixed size, such as -156237, often have insufficient lateral dimensions or, conversely, do not fit between angles. Further, the mortar is finally filled inside the auxiliary cover, but the number of joints of steel pipe sheet piles is large, so that the amount of mortar does not become ridiculous.

On the other hand, in the anti-corrosion structure disclosed in Japanese Patent Application Laid-Open No. 55-145210, the joint is cut off, so that anti-corrosion of the joint itself is not necessary. However, when there is a shank concrete on the upper part of the steel pipe, the cylindrical cover must be divided. Cannot insert. In addition, when attaching the auxiliary cover, it is necessary to drill a bolt hole while adjusting the position each time on site.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an anticorrosion for a steel pipe sheet pile that can cope with variations in the interval between joints even with an auxiliary cover of a fixed size and can reduce the amount of mortar in the auxiliary cover. It is to provide a structure.

[0008]

In order to achieve the above object, according to the present invention, there is provided a bracket which is fixed substantially in the vicinity of a joint between adjacent steel pipes, and a bracket which is attached to the bracket and covers the sea side of the steel pipe. In the anticorrosion structure having a cover panel and a corrosion-resistant auxiliary cover that covers the joint, the auxiliary cover has a substantially V-shaped cross section using a flexible material, and the both sides of the auxiliary cover are bent inside with the bent portion inside. It is fixed to the bracket.

[0009]

Since the auxiliary cover is formed in a V-shape with a flexible material, the lateral dimension can be adjusted, and the mortar filling space between the auxiliary cover and the joint can be reduced.

[0010]

1 and 2 show a plan view of an anticorrosion structure to which the present invention is applied and an enlarged plan view near a joint, respectively.

The steel pipe sheet pile 1 is constructed by connecting a plurality of steel pipes 1a driven into the sea by joints 2, and as shown in FIG. Two brackets 4 are fixed to the sea side of each steel pipe 1a at two places, and an arc-shaped cover panel 5 is provided between the brackets 4 and 4.
Is attached.

The cover panel 5 is made of a corrosion-resistant material such as FRP, and covers the ebb and splash area of the steel pipe 2. Although not shown, the lower end of the cover panel 5 is curved inward so that the seal at the tip abuts the steel pipe 1a so that seawater does not enter therein. A reverse valve is provided. A spacer 6 is interposed between the cover panel 5 and the steel pipe 1a to maintain the both at a fixed interval, and each spacer 6 is fixed to the inner surface of the panel 5 in advance so as to facilitate construction.

Below the joint 2, bottom plates 7a and 7b are welded as shown in FIG. The bottoms 7a and 7b are shaped to fit the outer surfaces of the joint 2 and the steel pipe 1a, and serve as a mounting table for the cover and a bottom seal. Also, the bottom plate 7
a and 7b are divided into two so that even if there is a variation in the shape of the gap between the steel pipes 1a and 1a, the center overlapping portion is welded or bolted. Further, when the sealing between the bottom plate 7b and the joint 2 becomes a problem, this portion is filled with the filling 8 as shown in FIG. When the front end is lower than the horizontal when the bottom plates 7a and 7b are attached, they are temporarily supported by the rod 9 as shown in FIG. 3, and the rod 9 is removed after the construction is completed.

On the other hand, the bracket 4 has a cover panel 5
In addition, an auxiliary cover 10 is attached to cover the front surface of the joint 2. The auxiliary cover 10 is formed of a flexible material such as FRP so as to have a substantially V-shaped cross section as shown in an enlarged view in FIG. It is fixed to the bracket 4 by 11. The bolt hole 10a of the auxiliary cover 10 is formed as a stupid hole so that the position can be adjusted, and it is desirable that the gap is sealed by sandwiching the sealing plates 12 and 13 on the front and back surfaces. Further, if a female screw is formed in the bolt hole 4a on the bracket 4 side, a nut is not required when the cover panel 5 or the auxiliary cover 10 is fixed.

As can be seen from FIG. 4, there is a certain gap between the cover panel 5 and the auxiliary cover 10 and the shade concrete 3 for the cover mounting operation, and the cover is finally covered with an upper cover 14 made of FRP. A plurality of long holes 14a are formed in the upper cover 14, while the long holes 14a are formed in the panel 5.
The extension portions 5a are formed so as to overlap with each other, and a female screw of the bolt 15 is formed in each extension portion 5a. Therefore, after the upper cover 14 is vertically adjusted by the distance of the long hole 14a, it can be bolted so that no gap is formed.

The procedure of the anticorrosion work constructed as described above will be described. First, as shown in FIG. 3, the sealing bottom plates 7a and 7b are welded below the steel pipe 1a, and the overlapping portion at the center of the bottom plate is firmly fixed. I do. Next, the cover panel 5 to which the bracket 4, the spacer 6, and the one end of the auxiliary cover 10 are attached in advance is placed on the bottom plates 7a and 7b, and the inside of the bracket 4 is welded to a predetermined position of the steel pipe 1a. At this time, since the auxiliary cover 10 is provided at the right end of the cover panel 5, only the bracket 4 is fixed to the left end of the cover panel 5 covering the next steel pipe 1a.
I will attach. When the cover panel 5 is large, the number of brackets 4 or metal fittings is appropriately increased.

Next, the free end of the auxiliary cover 10 supported in one side is fixed to the bracket 4 on the opposite side by bolts 11 with the seal plates 12 and 13 interposed therebetween. In this case, even if the steel pipes 1a are irregular and the intervals L between the brackets 4 and 4 are different, the auxiliary cover 10 is V-shaped and flexible, so that it can be easily handled only by changing the angle θ. Since it is a stupid hole, the insertion of the bolt 11 is also easy.

After the cover panel 5 and the auxiliary cover 10 are attached, the space between the shade concrete 3 and the cover panel 5 is completely covered with the upper cover 14 as shown in FIG. Then, when a hose is connected to a mortar inlet (not shown) below the cover panel 5 and the mortar is injected, the mortar flows not only into the cover panel 5 but also into the auxiliary cover 10 through the gap of the bracket 4. I do.

[0019]

As described above in detail, in the anticorrosion structure of the present invention, the auxiliary cover is formed in a substantially V-shaped cross section with a flexible material. By simply changing the bending angle of the mortar, the mortar can be easily mounted and the amount of mortar filled between the auxiliary cover and the joint can be saved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an anticorrosion structure of the present invention.

FIG. 2 is an enlarged plan view near a steel pipe joint.

FIG. 3 is a perspective view of a lower portion of the joint.

FIG. 4 is a front view of an upper portion of a cover panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel pipe sheet pile 1a steel pipe 2 Joint 4 Bracket 5 Cover panel 10 V-shaped auxiliary cover θ Angle of auxiliary cover bending

Claims (1)

(57) [Claims] 1. A bracket 4 substantially fixed and opposed to the vicinity of the joint 2 of each adjacent steel pipe 1a, a corrosion-resistant cover panel 5 attached to the bracket and covering the sea side of the steel pipe,
In the anti-corrosion structure having a corrosion-resistant auxiliary cover 10 covering the joint 2, the auxiliary cover 10 is made of a flexible material to have a substantially V-shaped cross section, and a bent portion of the auxiliary cover 10 is set inside and brackets are provided on both sides. 4. An anticorrosion structure for steel pipe sheet piles, which is fixed to No. 4.