缓粘结预应力技术在国家会议中心二期工程中的应用

APPLICATION OF RETARD-BONDED PRESTRESSING TECHNIQUE IN CHINA NATIONAL CONFERENCE CENTER PHASE Ⅱ

国家会议中心二期工程结构截面及长度较大,其地下1层顶板及梁采用缓粘结预应力技术。为抵抗温度变化弓|起的温度应力,控制结构的温度收缩及表面裂缝,针对工程特点和在施工过程中出现的塔式起重机洞口封闭时间错后施工等问题采取预控措施,取得了较好效果。

Considering the huge cross section and super length of the building structure of China National Conference Center Phase Ⅱ,retard-bonded prestressing technique was adopted for roof and beam construction of the first basement floor.According to the project characteristics and the retard closing of tower crane opening,pre-control measures were adopted to resist the temperature stress caused by temperature change and control the temperature shrinkage and surface crack of the structure.Favorable effects were realized.