港湾における鋼材腐食の研究 (第7報)
閘, 水門施設の腐食傾向
1973 年 22 巻 2 号 p. 55-63
詳細
1973 年 22 巻 2 号 p. 55-63
Corrosion survey of lock gate and sluice facilities at Amagasaki Harbor has been carried out, and the following results were obtained.
There was such tendency at gate leaves of the lock gate and the sluice that corrosion was concentrated at protruding parts of members (i.e., edges of reinforcement) in the area directly under L. W. L. as at steel sheet pile structures, and at extreme places corrosion rates exceeded 1mm/yr (one side), while material thicknesses reduced were not more than 0.1mm/yr (one side). Furthermore, such corrosion tendency could be seen at screens of pump houses for regulating water level inside the lock gate and the sluice. On the other hand, in the case of jet pipes of the gate leaves, corrosion was concentrated at the parts covered by drifting objects and the sides embedded in mud deposits.
However, the concentrated corrosion phenomena mentioned above could be explained by the same action of macro-corrosion cell as in the case of other steel structures at harbors.
Besides the above, corrosion survey method of lock gate and sluice facilities was also investigated and it was found that for grasping the true situation in corrosion of lock gate and sluice facilities, corrosion rates of members should be measured not only in the direction of thickness but also in the direction of width.
