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北京二环路改造工程,从1987年8月开工,至1992年9月全线竣工通车,共历时五年,实际工期只有43.5个月。二环路是沿着明、清两代内城和外城的城墙圈儿修建的环城干线,北京内、外城成凸字形,凸字的上半部为内城,下半部为外城,下半部的右侧(即东边)叫东厢,下半部的左侧(即西边)叫西厢,连结东、西、两厢的最下部(即南边)叫南厢。在东、西、南厢兴建之前,二环路只有凸字形的上半部,而且还有好几个主要
The renovation project of the Beijing Second Ring Road started in August 1987 and completed in September 1992. It lasted five years and the actual construction period was only 43.5 months. The Second Ring Road is a ring city line built along the walls of the inner and outer cities of the Ming and Qing dynasties. The inner and outer cities of Beijing are in a convex shape. The upper half of the convex characters is the inner city, and the lower half is the outer city. The city, the lower right side (that is, the east side) is called Dongxiang, and the lower left side (that is, the west side) is called the west compartment, connecting the east and west, and the lowermost part of the hatchback (that is, the south side) is called Nanxiang. Before the construction of the east, west and south compartments, the second ring road had only the upper half of the convex shape, and there were several major ones.