摘要
由于建筑物用途的改变需要对已张拉完毕的无粘结预应力结构进行改造。由于原结构的预应力筋已经张拉完毕,存在有较高的预压应力,切断预应力会对结构的挠度、裂缝等产生较大影响,同时对施工过程的安全要求特别高。介绍改造加固施工中的预应力筋处理方法,包括预应力处理中的支撑系统搭设、混凝土剔凿、预应力筋切断、放张及重新张拉等,施工结果表明具有良好的效果。
Because of building uses change, unbounded prestressed structure, which has been tensioned, need to be rebuilt. The tensioned prestress bars have higher pre-compressive stress. Cutting off the tensioned prestress bars will influence deflection and cracks of structure, and has higher request for safety during construction process. The authors show treatment methods on prestress bars during rebuilding and reinforcement construction including support system installation, concrete remoring, cut of prestress bars, relaxation and retension of prestress bars, etc. Construction results prove that the treatment method has good effect.
出处
《施工技术》
CAS
北大核心
2009年第11期86-87,共2页
Construction Technology
关键词
结构改造
加固
预应力筋
张拉
structure rebuilding
strengthening
prestress bar
tension