超长环形结构隧道预应力施工技术  

SUPER-LONG CIRCULAR TUNNEL PRESTRESSING CONSTRUCTION TECHNIQUE

作　　者：毛路[1] 史哲超 刘星楼 王闯 MAO Lu;SHI Zhe-chao;LIU Xing-lou;WANG Chuang(Beijing Construction Engineering Group,100055,Beijing,China)

机构地区：[1]北京建工集团有限责任公司,北京100055

出　　处：《建筑技术》2022年第7期858-860,共3页Architecture Technology

摘　　要：高能同步辐射光源(HEPS项目)工程采用后张法预应力技术,先在构件截面配置无粘结预应力筋,然后浇筑混凝土使其包裹在其中,待结构混凝土达到设计强度后,在结构混凝土上直接张拉预应力筋,从而实现对混凝土施加预应力。本工程采用1 860 MPa级强度的预应力筋,通过张拉建立初始应力,预应力筋设计强度达到1 395 MPa,该技术可显著节约材料,提高构件性能,控制构件裂缝,延长构件寿命。High Energy Photon Source(HEPS) project adopted post-tensioning prestressing technique to set bondless prestressed steel at the cross section of component and then pour concrete to cover the steel inside. The prestressed steel was directly tensioned on the structural concrete after the concrete has reached the designed strength. This method could apply prestress to the concrete. This project adopted 1860MPa prestressed steel whose initial stress was built through tensioning, and the designed strength of prestressed steel reached 1395MPa. This method could effectively save material, improve component performance, control component crack and prolong component service life.

关 键 词：后张法预应力技术 超长环形结构 隧道 

分 类 号：TU753[建筑科学—建筑技术科学]