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随着国家经济和城市建设的迅速发展,基础设施建设的力度必然加大,城市管线,如自来水、煤气、下水道、电力、通讯、石油和光缆等各类管线的铺设、更换和修复工程量急剧增加。美国预计未来20年为更换各类旧管道就要耗资1万亿美元。我国香港地区计划在未来20年内,每年用5亿港元进行修
With the rapid development of the national economy and urban construction, infrastructure construction will inevitably intensify. The construction, replacement and restoration works of urban pipelines such as running water, gas, sewage, electric power, communications, petroleum and optical fiber cables are drastically exacerbated increase. The United States estimates that it will cost about US $ 1 trillion to replace all kinds of old pipelines in the next 20 years. China’s Hong Kong region plans to use 500 million Hong Kong dollars for repairs in the next 20 years