JPH0412117Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an anti-corrosion structure that improves the sealing performance of the stepped portion of a stepped pile.

[Conventional technology]

Traditionally, steel pipe or concrete piles installed underwater are treated with anti-corrosion treatment, but the outside diameter of the piles is not constant due to the fact that plates, sheath pipes, etc. are attached to the inside of the piles. There is something attached. As shown in FIG. 1, the anticorrosion structure of such a stepped pile is to wrap a tetrolatum-impregnated tape or the like around the outer peripheral surface of the pile 10 to form an anticorrosion layer 1.
A protective cover 16 is attached to the outer peripheral surface of the large diameter portion 10a and the small diameter portion 10b of the pile 10.
a and the protective cover 16b, each protective cover 1
By tightening flanges (not shown) fixed to both side edges of 6a and 16b with bolts and nuts (not shown), the corrosion protection layer 12 is prevented from deterioration, peeling, damage, etc. due to water intrusion, etc., and the large diameter portion 10a is A filler 17 such as epoxy resin is adhered to the stepped portion 10c between the small diameter portion 10b and the small diameter portion 10b to protect the anticorrosive layer 12 in this portion and to block seawater from entering.

[Problem that the invention attempts to solve]

However, since the anti-corrosion construction of the pile 10 is carried out on site after the pile is installed, the filler 17 of the stepped portion 10c may not be bonded uniformly, resulting in a lack of stable quality, and the protective covers 16a, 16b
For example, a polyolefin-based synthetic resin may be used as the material, but this material does not have sufficient adhesion with the filler 17, so strong adhesion cannot be obtained in many cases. There is a problem that the anti-corrosion layer 12 may fall off or have poorly bonded areas, allowing seawater to enter, reducing the performance of the anti-corrosion layer 12.

In addition, when performing maintenance work after the anti-corrosion construction of the pile 10, the protective covers 16a, 16
When re-tightening the tightening bolts b, the filler 17 cannot follow the movement of the protective covers 16a and 16b, so a gap may be created in the bonded area or the filler 17 may fall off, which is the same as above. A problem has arisen.

The purpose of this invention is to solve the above-mentioned problems and provide an anti-corrosion structure that can improve the sealing performance at the stepped portion of the pile with simple construction.

[Means for solving problems]

In this invention, the anti-corrosion layer is coated on the outer circumferential surface of the stepped pile, and the adjacent large-diameter and small-diameter portions, from the large-diameter portion adjacent to the stepped portion to the small-diameter portion. It is covered with a flexible sealing material with an area approximately equal to the surface area of the pile.

This flexible sealing material is brought into close contact with the anti-corrosion layer of the large diameter part and the small diameter part by tightening the outer peripheral surfaces of the large diameter part and the small diameter part with a protective cover.

〔Example〕

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional side view showing an embodiment of this invention.

The outer circumferential surface of the pile 10 is coated with an anticorrosion layer 12 by wrapping a tetrolatum-impregnated tape or the like in the same manner as in FIG.

Stepped portion 1 of pile 10 to which anti-corrosion layer 12 is applied
A flexible sealing material 14 is interposed on the surface of the anti-corrosion layer 12 between a part of the large diameter part 10a above 0c and a part of the small diameter part 10b below the stepped part 10c. Protective covers 16a and 16b are attached to the portion 10a and the small diameter portion 10b.

The flexible sealing material 14 is made from a sheet made of rubber and molded to an appropriate thickness, or a sheet made by bonding rubber to a reinforcing material such as woven fabric. 10c to the small diameter portion 10b, or use the step portion 1 of the pile 10 described above.
A rubber body which is vulcanized and molded into a stepped cylindrical shape having the same shape as the large diameter portion 10a and the small diameter portion 10b adjacent to 0c is used and cut in the generatrix direction.

It is preferable that the flexible sealing material 14 has its wide part or large diameter part adhered in advance to the inner circumferential surface of the protective cover 16a that covers the large diameter part 10a of the pile 10. Although handling becomes easier, it may be wound around the pile 10 separately from the protective cover 16a.

As described above, the flexible sealing material 14 is interposed between the large diameter portion 10a and the small diameter portion 10b adjacent to the stepped portion 10c of the pile 10, and the protective cover 16 is
When a and 16b are tightened, the flexible sealing material 14
The upper end portion and the lower end portion are the large diameter portion 1 of the pile 10.
0a and the small diameter portion 10b, and the anticorrosion layer 12 of the stepped portion 10c is covered with the flexible sealing material 14 and completely sealed.

[Effect of idea]

As explained above, according to this invention, the outer peripheral surfaces of the anti-corrosion layer of the large diameter part and the small diameter part adjacent to the stepped part of the stepped pile are covered with a flexible sealing material, and the large diameter part and the small diameter part Since the structure is such that the flexible sealing material is brought into close contact with the anti-corrosion layer by the protective cover between the parts, not only the step part of the pile is completely sealed by the flexible sealing material, but also the flexible sealing material Because it is a factory-processed product, it is possible to use high-quality sealing materials, making it extremely easy to install on-site.Also, even if the protective cover is retightened after anti-corrosion construction, the flexible sealing material will remain intact. It has no effect on the sealing performance of the sealant, eliminates all the problems associated with conventional seals using fillers, and provides a corrosion-resistant structure with significantly higher sealing performance.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view showing an embodiment of this invention;
FIG. 2 is a longitudinal sectional side view showing a conventional anti-corrosion structure of a stepped pile. In the figure, 10 is the pile, 10a is the large diameter part, and 10b
10c is a small diameter part, 10c is a stepped part, 12 is an anticorrosive layer, 14
1 is a flexible sealing material, and 16a and 16b are protective covers.

Claims (1)

[Scope of utility model registration request] The outer circumferential surface of the anticorrosion layer is applied to the outer circumferential surface of the stepped portion of the stepped pile and the adjacent large-diameter and small-diameter portions of the pile from the large-diameter portion adjacent to the stepped portion to the small-diameter portion Cover the flexible sealing material with an area approximately equal to the surface area, and tighten the protective cover to the outer peripheral surfaces of the flexible sealing material of the large diameter part and the small diameter part adjacent to the stepped part, and A corrosion-resistant structure for stepped piles characterized by a flexible sealing material in close contact with the corrosion-protective layer between the small-diameter portion and the small-diameter portion.