JPH0414501Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a heavily corrosion-resistant underwater steel driven member for use in water areas such as the ocean or river areas where the movement of bottom sand is significant.

[Prior art]

When submersible steel driven members such as steel pipe piles and sheet piles are driven into underwater ground in water areas such as oceans or rivers where sediment movement is significant, movement of sediment, that is, abrasion caused by drifting sand and quicksand. As a result, the underwater steel driven member may suffer cross-sectional damage near the underwater ground surface, which may impede the stability of the structure.

Recently, in factories, it has become possible to use so-called heavy corrosion-resistant underwater steel driven members, which are coated with synthetic resin such as polyethylene or polyurethane on the surface of the driven members, such as steel pipe piles and sheet piles. There are more and more.

In the case of this heavy-duty anti-corrosion underwater steel driven member, the heavy-duty anti-corrosion material of synthetic resin is worn away by the movement of the bottom sand, resulting in damage and corrosion prevention problems.

[Problem that the invention attempts to solve]

Conventionally, as a countermeasure for this, as shown in Figure 6,
A method has been adopted in which the vicinity of the underwater ground surface of the heavily corrosion-proof underwater steel cast member 3 is covered with concrete 7, but this case has the following problems.

(1) After placing heavy corrosion-resistant underwater steel casting members, concrete must be placed underwater, which requires complicated work and increases construction costs.

(2) It is necessary to install a formwork for concrete pouring to surround heavy corrosion-resistant underwater steel casting members near the underwater ground surface, which requires complicated diving work and can take a long time if the water is deep. In addition, if the waves are large, diving may become difficult.

(3) If it is necessary to place the lower part of the formwork in the submerged soil, the submerged soil must be excavated;
This requires complicated excavation work, and
Water pollution occurs during excavation.

[Purpose of the invention, structure]

The purpose of this invention is to provide an underwater steel driven member that is sand abrasion resistant and heavily corrosion resistant, which can advantageously solve the above-mentioned problems. A steel cover 4 and a steel cover 4 are fixed to the outer surface of the heavy corrosion-resistant underwater steel driving member 3, which is constructed by applying a synthetic resin heavy anti-corrosion coating 2 to the outer periphery of the portion located near the underwater ground surface. A sand abrasion prevention cover 6 consisting of a corrosion resistant and abrasion resistant coating layer 5 is disposed, and at least the lower end portion of the steel cover 4 in the sand abrasion prevention cover 6 is fixed to the heavy corrosion protection underwater steel driving member 3. Features include sand abrasion prevention and heavy corrosion protection submersible steel driven parts.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

1 and 2 show a first embodiment of this invention, and show a portion of an underwater steel driving member 1 made of a steel pipe pile located above the water bottom ground surface 8, and a portion of the water bottom ground surface 8. A heavy anti-corrosion coating 2 with a thickness of 1.5 to 4.5 mm made of a synthetic resin such as polyethylene or polyurethane is fixed to the surface of a portion located slightly below, to constitute a heavy anti-corrosion underwater steel driven member 3, A corrosion-resistant and abrasion-resistant coating layer 5 made of a rubber material such as chloroprene rubber is fixed to the outer peripheral surface of a cylindrical steel cover 4 by heating and pressurizing (vulcanization) or using an adhesive to form a sand abrasion-preventing cover 6. , the sand abrasion prevention cover 6 is fitted around the outer periphery of the portion of the heavily corrosion-proof underwater steel driven member 3 disposed near the underwater ground surface, and the lower end of the steel cover 4 in the sand abrasion prevention cover 6 is fixed to the submersible steel driven member 1 by welding below the lower edge of the heavy corrosion protection coating 2.

3 and 4 show a second embodiment of this invention, in which a large number of steel connection pieces 9 are provided at the lower end of the steel cover 4 of the sand abrasion prevention cover 6 at intervals in the circumferential direction of the cover. The connection pieces 9 are arranged by welding at a distance below the lower edge of the heavy corrosion protection covering 2 in the heavy corrosion protection underwater steel drive member 3 by welding to the underwater steel drive member 1. However, the other configurations are the same as in the first embodiment.

In the second embodiment, when the gap between the underwater steel driving member 1 and the steel cover 4 is relatively large, the steel cover 4 can be easily fixed to the underwater steel driving member 1. .

When implementing this invention, the material constituting the corrosion-resistant and wear-resistant coating layer 5 may be a wear-resistant polyurethane, a polyolefin resin such as polyethylene, or a low-density polyethylene containing carbon black or an oxidative deterioration inhibitor. You can.

Further, as shown in FIG. 5, a rubber layer 10 such as chloroprene rubber is provided on the outer peripheral surface of the cylindrical steel cover 4.
A sand abrasion prevention cover 6 may be used, which is constructed by fixing a corrosion-resistant and abrasion-resistant coating layer 5 consisting of a rubber layer 10 and a ceramic tile 11 fixed to the outer surface of the rubber layer 10.

The upper end of the sand abrasion prevention cover 6 may be fixed to the heavily corrosion-resistant underwater steel driving member 3 by an appropriate means. It can also be implemented to prevent sand abrasion of steel driven members.

[Effect of idea]

According to this invention, the outer periphery of the portion of the heavy corrosion-resistant underwater steel driving member 3, which is constructed by applying a synthetic resin heavy anticorrosion coating 2 to the surface of the underwater steel driving member 1, is , a sand abrasion prevention cover 6 consisting of a steel cover 4 and a corrosion and abrasion resistant coating layer 5 fixed to its outer surface is disposed, and at least the lower end of the steel cover 4 in the sand abrasion prevention cover 6 is made of heavy corrosion protection underwater steel. Since it is fixed to the sand abrasion-preventing heavy-duty corrosion-resistant underwater steel driving member 3, simply driving the heavy-duty corrosion-resistant underwater steel driving member 3 into the underwater ground will prevent sand abrasion near the underwater ground surface of the heavy-duty corrosion-resistant underwater steel driving member 3. Prevention cover 6
can be installed automatically, and therefore there is no need to perform concrete pouring work to prevent sand abrasion of heavy corrosion-resistant submersible steel cast members underwater, reducing construction costs and shortening the construction period. Because it does not require diving work, it can be constructed without being affected by water depth or waves, and there is no need to excavate the underwater ground.
There is no need to worry about water pollution, and the sand abrasion prevention cover 6 can cover and protect the lower part of the heavy corrosion protection coating 2.

[Brief explanation of the drawing]

Figures 1 and 2 show a first embodiment of this invention, and Figure 1 is a side view showing a part of a sand-wear and heavy corrosion-proof underwater steel driven member driven into the underwater ground. FIG. 2 is an enlarged sectional view taken along the line A--A in FIG. 1. Fig. 3 is a side view showing a part of a sand abrasion-preventing heavy corrosion-proof submersible steel driven member according to the second embodiment of this invention, Fig. 4 is an enlarged sectional view taken along line B-B in Fig. 3, and Fig. 5 The figure is a longitudinal sectional side view showing another example of the sand abrasion prevention cover. FIG. 6 is a partially longitudinal side view showing a conventional means for preventing sand abrasion of a heavy corrosion-resistant submersible steel driven member. In the figure, 1 is an underwater steel driven member, 2 is a heavy anti-corrosion coating, 3 is a heavy corrosion-resistant underwater steel driven member, 4 is a steel cover, 5 is a corrosion-resistant and wear-resistant coating layer, 6 is a sand-wear prevention cover, 8 is the water bottom ground surface, 9 is the steel connection piece, 10
1 is a rubber layer, and 11 is a ceramic tile.

Claims (1)

[Scope of utility model registration request] A steel cover 4 is attached to the outer periphery of the portion of the heavily corrosion-resistant underwater steel driven member 3, which is constructed by applying a synthetic resin heavy anticorrosion coating 2 to the surface of the underwater steel driven member 1, which is located near the underwater ground surface. A sand abrasion prevention cover 6 consisting of a corrosion resistant and abrasion resistant coating layer 5 fixed to the outer surface is disposed, and at least the lower end of the steel cover 4 in the sand abrasion prevention cover 6 is attached to the heavily corrosion resistant underwater steel driven member 3. A driven member made of sand abrasion and heavy corrosion protection submersible steel, which is characterized by being fixed.