Corrosion protection method for cable tray of cross-sea bridge in high salt-fog region

Abstract

The invention specifically relates to a corrosion protection method for a cable tray of a cross-sea bridge in a high salt-fog region. The corrosion protection method includes firstly selecting Q355GNH weathering resistant steel to replace normal low alloy steel as a principal material of the tray, wherein the atmospheric corrosion resistant property of the weathering resistant steel is 4 to 8 times that of the ordinary steel, and the coating property of the weathering resistant steel is 2 to 10 times that of the ordinary steel; selecting zinc-aluminium alloy with the volume ratio of 1: 1 as thermal spraying metal and covering epoxy micaceous iron oxide intermediate paint and fluorocarbon finish paint on a metal coating, wherein the epoxy micaceous iron oxide intermediate paint and the fluorocarbon finish paint have excellent performances of corrosion resistance, no maintenance, self cleaning, high adhesiveness, and ultra-long weather resistance; using a Q235 hot-dip galvanized steel grating plate as a grating plate, wherein the Q235 hot-dip galvanized steel grating plate is convenient to install and detach; using A4-70 stainless steel bolts in consideration of the importance of the bolts on a bridge structure and the inadaptation of a corrosion protection system of the principle material to friction that the principle material needs to bear, wherein the stainless steel bolts are good in resistance to salt-fog corrosion. The corrosion protection method is capable of furthest reducing times for repairing or repainting an erosion resistant coating of the cable tray in the high salt-fog region environment, reducing daily maintenance difficulties and investments, and achieving the purpose of minimizing full life cycle costs of the cable tray.

Description

technical field

[0001] The invention belongs to the field of anticorrosion of steel structures of highway bridges, and in particular relates to an anticorrosion method for cable bridges of sea-crossing bridges in high salt spray areas. Background technique

[0002] When the cables of the cross-sea bridge are arranged on the outside of the bridge box, the steel structure bridge frame is seriously affected by the humid and salt spray of the ocean. At the same time, the daily maintenance of the bridge frame is difficult, and conventional anti-corrosion measures are difficult to meet the above requirements at the same time. Therefore, according to the characteristics of the project, combined with the characteristics of typical anti-corrosion technologies for various steel structures, and considering the differences in the uses of each component of the structure, it is very important to select an anti-corrosion scheme suitable for the situation.

[0003] "Technical Conditions for...

Examples

Embodiment 1

[0018] Q355GNH weathering steel is used as the main material of the bridge frame, and zinc-aluminum alloy with a volume ratio of 1:1 is thermally sprayed on its surface, and the metal coating is covered with epoxy cloud iron intermediate paint and fluorocarbon topcoat; Q235 hot-dip galvanized steel grating is used As the grid plate, A4-70 stainless steel bolts with the grade of 316L are selected. Compared with the existing cable trays, the cable trays thus made have good corrosion resistance, long service life, relatively easy daily maintenance, and low cost. And in the whole life of the project, the grid plate was replaced only once. Table 1 compares the economic investment of various anticorrosion schemes. It can be seen from Table 1 that the anti-corrosion scheme of the present invention has less economic investment than the common anti-corrosion scheme, and the anti-corrosion effect is better.

[0019] Table 1 Economic comparison of various anticorrosion schemes

[0020...

technical field

[0001] The invention belongs to the field of anticorrosion of steel structures of highway bridges, and in particular relates to an anticorrosion method for cable bridges of sea-crossing bridges in high salt spray areas. Background technique

[0002] When the cables of the cross-sea bridge are arranged on the outside of the bridge box, the steel structure bridge frame is seriously affected by the humid and salt spray of the ocean. At the same time, the daily maintenance of the bridge frame is difficult, and conventional anti-corrosion measures are difficult to meet the above requirements at the same time. Therefore, according to the characteristics of the project, combined with the characteristics of typical anti-corrosion technologies for various steel structures, and considering the differences in the uses of each component of the structure, it is very important to select an anti-corrosion scheme suitable for the situation.

[0003] "Technical Conditions for...

Examples

Embodiment 1

[0018] Q355GNH weathering steel is used as the main material of the bridge frame, and zinc-aluminum alloy with a volume ratio of 1:1 is thermally sprayed on its surface, and the metal coating is covered with epoxy cloud iron intermediate paint and fluorocarbon topcoat; Q235 hot-dip galvanized steel grating is used As the grid plate, A4-70 stainless steel bolts with the grade of 316L are selected. Compared with the existing cable trays, the cable trays thus made have good corrosion resistance, long service life, relatively easy daily maintenance, and low cost. And in the whole life of the project, the grid plate was replaced only once. Table 1 compares the economic investment of various anticorrosion schemes. It can be seen from Table 1 that the anti-corrosion scheme of the present invention has less economic investment than the common anti-corrosion scheme, and the anti-corrosion effect is better.

[0019] Table 1 Economic comparison of various anticorrosion schemes

[0020...

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