某重载结构的拔柱改造技术应用研究
|
摘要
对于重载结构的拔柱改造,传统的增大截面方式已不适用。本工程屋面上有3m覆土,通过拔除4棵框架柱,形成两个大厅。受限于现场条件,所有加固改造工作均需要在板下进行。通过采用预应力钢结构技术,使双向受力楼盖仅在短向传递荷载,合理控制了结构自重增量,减少了构件加固数量。通过增加钢结构压杆,平衡了预应力筋的水平拉力,避免了混凝土楼盖新增轴向荷载。通过合理安排施工顺序,确保了分析计算与结构实际受力相吻合。
For the reconstructing of heavy-load structures, the traditional method of increasing the section is no longer applicable. The roof of this project is covered with 3 meters of soil. By removing four frame columns, two halls are formed. Restricted by site conditions, all reinforcement and reconstruction work needs to be carried out under the slab. By adopting the technology of prestressing steel structure, the two-way load-bearing floor can only transfer loads in short direction, reasonably control the weight increment of the structure, and reduces the number of reinforcement members. The horizontal tension of the prestressing tendons is balanced by increasing the steel beams, and the additional axial load of the concrete floor is avoided. By reasonably arranging the construction sequence, it ensures that the analysis and calculation are consistent with the actual state of the structure.
For the reconstructing of heavy-load structures, the traditional method of increasing the section is no longer applicable. The roof of this project is covered with 3 meters of soil. By removing four frame columns, two halls are formed. Restricted by site conditions, all reinforcement and reconstruction work needs to be carried out under the slab. By adopting the technology of prestressing steel structure, the two-way load-bearing floor can only transfer loads in short direction, reasonably control the weight increment of the structure, and reduces the number of reinforcement members. The horizontal tension of the prestressing tendons is balanced by increasing the steel beams, and the additional axial load of the concrete floor is avoided. By reasonably arranging the construction sequence, it ensures that the analysis and calculation are consistent with the actual state of the structure.
引文
[1] GB 50010—2010,混凝土结构设计规范[S]
[2] 张吉柱.预应力技术在某抽梁拔柱改造工程中的应用[J].建筑科学,2011,(S2):194-196
[3] 张吉柱,李荻,潘从建.结构局部改造过程中的若干问题处理[J].建筑科学,2013,(S):372-375
[4] 张吉柱.超长混凝土结构后浇带有效作用的关键性影响因素分析[J].建筑科学,2010,7(16):66-71
[5] 方俊,任胜谦,张吉柱.超长混凝土结构收缩与温度裂缝控制探讨[J].建筑科学,2014,30(5):121-124
[2] 张吉柱.预应力技术在某抽梁拔柱改造工程中的应用[J].建筑科学,2011,(S2):194-196
[3] 张吉柱,李荻,潘从建.结构局部改造过程中的若干问题处理[J].建筑科学,2013,(S):372-375
[4] 张吉柱.超长混凝土结构后浇带有效作用的关键性影响因素分析[J].建筑科学,2010,7(16):66-71
[5] 方俊,任胜谦,张吉柱.超长混凝土结构收缩与温度裂缝控制探讨[J].建筑科学,2014,30(5):121-124