无粘结预应力混凝土楼盖封洞与开洞改造设计

哈尔滨中央大厦塔楼楼 (屋 )盖为无粘结预应力混凝土梁板结构。塔楼的复式住宅原位于 2 1层～ 2 2层 ,业主决定将复式住宅调整至 2 2层～ 2 3层。为完成复式住宅调整任务 ,需对 2 1层顶局部楼盖进行封洞改造 ,对 2 2层顶局部楼盖进行开洞改造。给出了楼盖封洞的方法 ,介绍了待开洞口边缘后置板下支承梁的设计及施工方法 ,后置梁及开洞板相关梁的加固设计与施工方法 ,开洞时预应力筋的临时锚固措施与永久性锚固体系的建立方法 ,开洞后相关板格靠近洞口边缘支座负弯矩影响区的加固设计思路和方法 ,可供其他无粘结预应力混凝土楼盖封洞及开洞改造时参考

REMODELING DESIGN OF SEALING AND OPENING IN FLOORS PRESTRESSED WITH UNBONDED TENDONS

The structure of floors and roof of Harbin Zhongyang Tower is concrete beams and plates prestressed with unbonded tendons.Compound type houses are on 21st floor and 22nd floor originally.Building owner requires that the compound type houses be adjusted to 22nd floor and 23rd floor.To complete the task of adjusting house,remodeling of sealing in local area on top of 21st floor and remodeling of opening in partly floor on top of 22nd floor need to be done.It is given that the method of sealing remodeling of local floor.It is also presented that design and construction method of post-building beam under plate,design and construction ways of reinforcing beams interrelated posted-building beam and opening slab,temporary anchor and permanent anchor of prestressing tendons in opening,and reinforcing thought and method of negative moment region of the plate neighboring holes.It may be served as reference for remodeling design of sealing and opening of other floor prestressed with unbonded tendons.