在目前的房地产开发中，建筑开发单位为获得更大的经济效益，很多开发商都采用了所谓的“滚动开发”模式，即一项工程先建成部分投入使用，回收的资金再投入其它部分的开发建设，这样就出现了许多边设计、边施：工、边使用的“三边”工程、在；日城改造、大型建筑开发、综合性商住 In the current real estate development, building development units in order to obtain greater economic benefits, many developers have adopted the so-called “rolling development ” model, that is, a project put into use partially completed, the recovered funds and then into other parts The development and construction of such a large number of side design, side facilities: workers, while using the “three sides” project, in; Japan city transformation, large-scale construction development, comprehensive commercial and residential