overhaul inspection

During the overhaul period in 2001, an all-sided inspection was made to the three towers, causes were analysed, and measures were taken, the problem of surface cracks have been solved.

2001年大修期间，对三塔进行了全面检验，分析原因后采取有效错施，解决了表面裂纹问题，至今未出现大修以前的损坏现象。

It includes, inspection, overhaul, repair, preservation and the replacement of parts.

包括检查，大修，修理，保养和部件更换。

The hazard of our society has been introduced by settlement of inspection chamber in road, and the fee of maintenance and overhaul are incrementing every year.

检查井的沉降给社会带来很大危害，且每年用于维修检查井的费用也在递增。