JPS605180B2 - Anti-corrosion construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrosion-proof construction method for a steel structure constituting a biologically active sewage treatment facility.

Industrial wastewater from the textile industry, pulp industry, food industry, and urban sewage contain various organic substances, and if such wastewater is directly discharged into rivers or the like, it will cause industrial pollution. For this reason, wastewater may be purified by oxidizing and decomposing organic matter using a trickling filter, a high-speed aeration sedimentation tank, or the like.

In such cases, slow-building steel is used in sewage treatment equipment, and for example, in systems that use a sprinkler hearth, H steel, C steel, Y steel, and pipes are used to hold and fix the hearth. Steel structures such as straw are used.

In the above-mentioned sewage treatment equipment, the steel structure is subject to corrosion. By the way, in the prior art, as a method for preventing corrosion of such steel structures, there is a method of applying paint to the surface, but this method has the disadvantage that the thick coating causes unevenness.

Another possibility is to form an anti-corrosion layer on the surface of the steel structure and coat this layer with a rubber sheet or FRP molded product, but in the former method, the rubber sheet and anti-corrosion layer must be bonded securely. adhesive is required, and the sheet must have a fixed odor.

In addition, when constructing with H steel, L steel, C steel, etc., the former tends to create gaps between the anticorrosion layer and the rubber sheet, and the latter requires multiple types of FRP molded products depending on the shape of each steel. There is. This invention eliminates the above-mentioned drawbacks, and includes providing an adhesive anti-corrosion layer on the surface of the copper horizontal structure constituting biologically active sewage treatment equipment, and hardening the sheet-like fiber base material at room temperature on this layer. The present invention relates to a method for anticorrosion construction of a steel structure constituting biologically active sewage treatment equipment, in which a coating made of a non-sagging resin composition is formed and cured to provide a fiber-reinforced resin protector.

Examples of the adhesive anticorrosive material used in the present invention include putty-like materials containing tannins mainly composed of betarolatum and rust preventive agents. Preferably, these putty-like materials are applied to sheets of polyester nonwoven fabric, glass cloth, etc. It is preferable to use it in the form of a tape or sheet obtained by impregnating a fibrous base material or a porous base material.

As for the properties of the adhesive anticorrosion, it is preferable that it does not evaporate or harden semi-permanently, has excellent anticorrosion functions such as impermeability and water resistance, and adheres closely to the metal surface and completely cuts off contact with the outside atmosphere. .

The sheet-like fiber base material used with the non-sagging resin composition may be any organic or inorganic non-woven fabric or woven fabric (for example, made of polyester fiber or glass fiber), but glass fiber woven fabric is particularly suitable. It is preferable to use The sheet-like fiber base material has a thickness of 5
It is preferable to use 0 to 500 μm.

Examples of the cold-curing non-sagging resin composition used in the present invention include epoxy resin compositions, unsaturated polyester resin compositions, phenol resin compositions, xylene resin compositions, etc. that have a non-sagging function. These can be provided in the form of putty or paste at room temperature.

The present invention will be specifically explained below using examples.

Example H The surface of the steel was subjected to three types of scratching as specified in the Japan National Railways rust removal standards.

Next, the surface of the stain is coated with an adhesive preventive material (made by impregnating a nonwoven fabric with a paste-like rust preventive agent whose main ingredient is vetrolatum).

Next, apply a glass cloth (thickness: 100mm, width: 50mm, manufactured by Nittobo Co., Ltd., WK-302 mountain AIO plate ME4) to the surface covered with this anticorrosive layer.
) in one layer.

At this time, the glass cloth can be attached more easily than the adhesive curve of the anticorrosive material. Also, the overlapping portions of glass cloth should overlap by about 3 feet. Next, a room temperature curing type epoxy resin non-sagging resin composition was applied onto the glass cloth and cured at room temperature. The above composition is 3
Finished with two coats.

That is, when the first coat was dry to the touch, a second coat was applied, and a third coat was applied in the same manner. Further, as the above-mentioned non-sagging resin composition, a putty-like material was used, which was made by uniformly mixing an epoxy resin, silica powder, an aerosilsilane coupling agent, a polyamide amine, an aromatic amine, and talc.

As described above, according to the anticorrosion construction method of the present invention, the metal surface of a steel structure constituting biologically active sewage treatment is coated with an adhesive anticorrosive material according to its shape, and a sheet-like fibrous base material is coated on this layer. Since a coating made of a non-sagging resin composition is formed, it has good field workability (it is easy to apply to steel materials of any shape), and the anticorrosion layer and FRP layer have good adhesion and have an excellent anticorrosion effect.

Claims (1)

[Claims] 1. An adhesive anticorrosion layer is provided on the surface of a steel structure constituting a biologically active sewage treatment facility, and a coating made of a sheet-like fiber base material and a non-sagging resin composition that hardens at room temperature is formed on this layer and cured. A corrosion-proof construction method for a steel structure constituting biologically active sewage treatment equipment, which is provided with a fiber-reinforced resin protector.