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城市高架桥调坡顶升改造技术要点
| 题名： | 城市高架桥调坡顶升改造技术要点 |
| 作者： | 郁超 |
| 作者单位： | 南通市城市建设工程管理中心 |
| 关键词： | 城市高架桥;整体调坡顶升;角速度;限位装置 |
| 摘要： | 城市快速路网建设中常涉及到新老高架连接处落地段如何改造的问题，为既避免资源浪费、缩短工期、节约投资，桥梁整体调坡顶升应运而生。整体调坡顶升涉及反力基础、千斤顶合理配置、随动顶的使用、限位装置布设等关键技术，详细介绍了城市高架桥调坡顶升改造技术要点，可为类似工程提供参考。Research on Crack Resistance of Expansive Agent and Fiber Reinforced ConcreteZhao Mingzhe' . Chen Peng' . Tang Longlong2 ， Tang Lei' ， Chen Li mg3（ 1. CCCC Third Highway Engineering Co. ， Ltd. ， Beijing 101300，China；2. Nanjing Hualu Engineering Design Co. ， Ltd. ， Nanjing 210000，China；3. Jiangsu Zhonglu Engineering Technology Research Institute Co. ， Ltd. ， Nanjing 210000， China）Abstract Through the addition of expansive agent of calcium magnesium and basalt fiber， the stress andstrain of concrete are studied by the uniaxial tensile test， the influence of different components， content and waterbinder ratio on the crack resistance of concrete is explored， and the mathematical expression of axial tensile stress -strain curve of concrete with expansive agent and crack resistant fiber is determined. The research shows that ： theaddition of expansive agent and basalt fiber can improve the tensile strength and toughness of concrete. When thecontent of fiber and expansive agent is respectively lo/o and 7% ， the water binder ratio is 0. 42， and the crackresistance of concrete is good. The constitutive equation obtained is basically consistent with the test result， whichcan provide the theoretical basis for the research and application of crack resistant concrete.Key words Expansive agent of calcium magnesium； Basalt fiber； Concrete； Stress - strain curve； Crackresistance |
| 期刊名称： | 北方交通 |
| 出版年： | 2023 |
| 期： | 01 |
| 页码： | 5-10 |
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