This paper summarizes construction te chnologies used in canalseepage control project construction of wangzhuang irrigat ion area , suchas the manufacture of vibration machine , prefabrication of concr ete board , filling of expansion and contraction joint , pavement of geosynthetic s materials , and also supplies for reference of alike construction 1经济与社会效益南水北调工程的建设将有利于利用南方地区水资源的优势,增强北方地区的经济优势;有利于提高受水区的水资源与水环境承载能力,增加经济发展的后劲;有利于遏制并逐步改善日益恶化的生态环境;有利于地区间经济社会和生态的协调发展
1 summarization at present , super - length tall buildings are ever - increasing by popular . expansion and contraction joint is not supposed to be located or at least frequently located in average buildings for the requirements of their functions . the longest space between two expansion and contraction joint , which is set in code for structural design is frequently exceeded in cast - in - place frame structure 目前超长高层建筑日见增多,由于功能以及使用上的需要,要求不设或少设伸缩缝,结构设计规范对现浇框架结构不设伸缩缝的最大间距的规定常常被突破,这就需要考虑温度对结构的影响。