Title:
防錆方法
Document Type and Number:
Japanese Patent JP7329380
Kind Code:
B2
Abstract:
To provide a rust prevention method in which rigid polyurethane foam is filled into a steel pipe extending in an upper direction without any gap, rust on an inner surface of the steel pipe can be sufficiently prevented, can be easily operated, and is excellently safe to a worker.SOLUTION: A rust prevention method for preventing rust on an inner surface of an existing steel pipe 40 extending in an upper direction comprises: an injection process of injecting a rigid polyurethane material 46 from an existing hole 26 provided for a side surface of the steel pipe 40 into the steel pipe 40; and a foaming process of foaming the rigid polyurethane material 46 injected by the injection process, by which rigid polyurethane foam 48 is filled into the steel pipe 40.SELECTED DRAWING: Figure 2
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Inventors:
Katsutoshi Toyoda
Tetsuya Kamizono
Tetsuya Kamizono
Application Number:
JP2019134836A
Publication Date:
August 18, 2023
Filing Date:
July 22, 2019
Export Citation:
Assignee:
Achilles Corporation
Kawakita Electric Co., Ltd.
Kawakita Electric Co., Ltd.
International Classes:
C23F15/00; E04H12/08
Domestic Patent References:
| JP3000168A | ||||
| JP2011246775A | ||||
| JP2014005688A |
Foreign References:
| WO2015107913A1 |
Attorney, Agent or Firm:
Isamu Hosoi
Yukiko Kurita
Yukiko Kurita