JPS606436Y2 - Galvanic annular anode for cathodic protection - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a galvanic anode for cathodic protection of pipes such as gas pipes and water pipes, especially end supply pipes.

The end supply pipes that supply gas, water, etc. to general consumers are small in scale, the piping conditions vary widely, and the number of construction projects is enormous.

Therefore, piping work is carried out only by plumbing contractors, and it is extremely difficult to include cathodic protection work.

In addition, cathodic protection of the conventional terminal supply pipe as described above is carried out by, for example, removing a part of the coating 2 of the coated steel pipe 1 and welding the terminal 3 to the part of the steel pipe from which the coating was removed, as shown in FIG. Wiring is carried out from the terminal 3 to the galvanic anode 4, and the terminal 3 and part of the piping 5 are repaired and coated 6.
It was done by covering it with

For this reason, in order to carry out cathodic protection using the conventional method, as shown in Fig. 2, the excavated trench 7 in the land requires a large cross-sectional area, and it cannot be carried out by a plumber alone, so welders and corrosion protection workers are required. In addition to requiring additional work, it also requires equipment such as a welding machine and a terminal crimping tool, and the coating has to be repaired.

In view of the above, it is an object of the present invention to provide a galvanic anode that can be easily installed even by a plumber.

The present invention will be explained below with reference to examples.

FIGS. 3a and 3b are partially sectional front and side views of a galvanic anode according to an embodiment of the present invention.

The galvanic anode of this embodiment has a core metal 10 whose inner diameter is approximately equal to the outer diameter of the coated steel pipe 1, and whose inner peripheral surface is coated with an insulating coating, and whose outer peripheral surface is made of, for example, magnesium or zinc. The galvanic anode main body 11 is fixed.

Note that both ends of the core metal 10 are made to protrude from the end surface of the galvanic anode main body 11.

With the galvanic anode body 11 fixed, the core bar 10 is attached to the outer periphery of the coated steel pipe 1, and screws are inserted through the core bar 10 at the portions of the core bar 10 that protrude from both end surfaces of the galvanic anode body 11. 12, the core bar 10 is fixed to the coated steel pipe 1.

In this case, the tip of the screw 12 is set so as to reach the steel pipe portion of the coated steel pipe 1.

Therefore, the core metal 10 is fixed to the coated steel pipe 1, and the steel pipe part of the coated steel pipe 1 and the galvanic anode main body 11 are electrically connected through the screws 12, and the coated steel pipe 1 is connected to the galvanic anode main body 11.
Corrosion is prevented by

In this case, as shown in Figure A, it is also possible to weld the terminal 3 to the end of the core metal 10 and connect the lead wire 13 for connecting the galvanic anode to this.

As explained above, according to the present invention, the galvanic anode can be inserted into the coated steel pipe during piping work and fixed to the coated steel pipe with screws, and general tools such as a screwdriver are not required for fixing. It does not require any special tools and can be easily installed and fixed by a plumber.

Further, the cross-sectional area of the excavated groove for attaching the galvanic anode does not need to be particularly large for the galvanic anode.

Furthermore, there is no need to repair the coating of the coated steel pipe.

[Brief explanation of drawings]

Figures 1 and 2 are front and side views for explaining the installation of a conventional galvanic anode, and Figures 3a and b are a partially sectional front and side view of a galvanic anode according to an embodiment of the present invention. figure. 1... Coated steel pipe, 10... Core metal, 11
・・・・・・Electric current anode main body, 12・・・・・・Screw.

Claims (1)

[Scope of utility model registration request] A cylindrical core metal whose inner diameter is approximately equal to the outer diameter of the coated steel pipe used as fluid transport piping and whose inner peripheral surface is coated with insulation, and is fixed to the outer periphery of the core metal while being electrically connected to the core metal. The core metal and the coated steel pipe are connected to each other by a screw that is attached to a part of the outer periphery of the coated steel pipe and passes through the core metal and reaches the steel pipe portion of the coated steel pipe. What is claimed is: 1. A galvanic annular anode for cathodic protection, characterized in that the galvanic anode is fixed thereto and the steel pipe portion of the coated steel pipe and the galvanic anode main body are electrically connected to each other.