万州大桥典型病害分析及处治方法研究
发布时间：2019-03-14 10:11
【摘要】：钢管混凝土连续刚构桥由于其具有承载能力高、抗震性能好、施工方便、综合经济效益好等优点得到桥梁工程师们的青睐。在国内,首先在万州道河沟大桥上成功应用,随后在万州大桥以及向家坝大桥上推广。而国外主要研究方钢管砼、圆钢管砼、矩形钢管砼和薄壁钢管砼结构,以及核心砼为素砼或在核心砼中配置钢筋或型钢。钢管混凝土连续刚构桥的应用尚未成熟,在理论上和工程技术上仍不够完善,已建成桥梁中存在一定的病害,如非线性温度分布使高墩产生偏位及侧向稳定问题;过大的温差导致钢管和砼脱空等问题。本文以万州大桥为工程依托,结合万州大桥的实际情况,阐述了钢管砼连续刚构桥的病害、原因及维修处治措施,为同类桥梁的设计施工提供具有现实价值的参考,主要研究内容包括以下几个方面:1)针对万州大桥的运营情况,总结目前存在的病害:4#、9#墩上、下支座完全失去支座滑移功能;4#、9#端横梁顶部砼严重碎裂,钢筋外露,有横向贯通裂缝及斜向裂缝;5#~8#墩与主桁架下平联杆件连接处砼局部压碎;7#墩侧向倾斜,横系梁处有斜向裂缝;11#墩与12#台之间桥面板铰缝处砼脱;10#墩基础外露。2)分析万州大桥的病害产生的原因:端横梁位于刚构边跨端部,由于支座不能复位,端横梁和桥墩承受巨大的外力,桥墩变形到一定限度后,外力全部作用在横梁钢管和砼上。横梁处砼厚度较小,配置钢筋数量有限,不能承受巨大的变形力,导致横梁出现大量裂缝和砼破损脱落;5#~8#主桁架下平联杆件连接处由于钢构件和砼构件变形的不一致引起砼被压碎;7#墩由所处的地质环境条件及受人工填土的侧向压力和在水管断裂后漏水导致地下水位上升所增加的水压力等综合作用下,墩身侧向倾斜,系梁开裂。3)针对万州大桥的病害提出加固方法:对端横梁采取钢板/砼组合结构增大截面的方法进行加固,更换全部支座;采用桩+钢筋砼护筒对7#墩进行保护,各个桩之间设置横系梁,并与桥墩分离;5#~8#墩与主桁架下平联杆件连接处压碎的砼采用粘贴钢板加固;修补11#墩与12#台之间铰缝处脱落的砼;修复10#墩处断裂的污水管道。4)文末总结了万州大桥的典型病害及其他病害的加固设计,对钢管混凝土连续刚构桥将来设计施工的优化提供了较好的指导意义和参考价值。
[Abstract]:Concrete-filled steel tube continuous rigid frame bridge has been favored by bridge engineers because of its high bearing capacity, good seismic performance, convenient construction and good comprehensive economic benefit. In China, it has been successfully applied in Wanzhou Dahegou Bridge, and then in Wanzhou Bridge and Xiangjiaba Bridge. In foreign countries, concrete filled steel tubes (CFST), concrete filled steel tubes (CFST) and thin wall concrete filled steel tubes (CFST) are mainly studied, and the core concrete is made of plain concrete or reinforced steel or section steel. The application of concrete-filled steel tube (CFST) continuous rigid frame bridge is not mature, and it is not perfect in theory and engineering technology. There are some defects in the built bridge, such as the deflection and lateral stability of high pier caused by nonlinear temperature distribution. Excessive temperature difference causes problems such as steel tubes and concrete emptying. Based on the project of Wanzhou Bridge and the actual situation of Wanzhou Bridge, this paper expounds the disease, causes and maintenance measures of CFST continuous rigid frame bridge, which provides practical reference for the design and construction of similar bridges. The main research contents include the following aspects: 1) in view of the operation of Wanzhou Bridge, summarize the existing diseases: 4, 9 # pier, the lower support completely lost the support slip function; 4), the top concrete of the 9 # end beam is seriously cracked, the steel bar is exposed, and there are transverse through cracks and oblique cracks; the 5 # pier and the lower horizontal connecting member of the main truss are partially crushed by the concrete; the 7 # pier is inclined sideways, and there are oblique cracks in the transverse beam, and the concrete is broken in the section between the 5 # pier and the horizontal connecting member of the main truss. Between 11 # pier and 12 # abutment, the concrete is removed from the joint between the bridge deck and the 12 # abutment. 1 0 # pier foundation exposed. 2) analyze the causes of the disease of Wanzhou Bridge: the end beam is located at the end of the rigid frame, because the support can not be reset, the end beam and pier bear a great external force, and after the pier deforms to a certain extent, The external force all acts on the beam steel tube and concrete. Because of the small thickness of concrete and the limited number of steel bars, it can not bear the huge deformation force, which leads to a large number of cracks and concrete breakage and shedding. The concrete is crushed because of the inconsistency between the deformation of the steel member and the concrete member at the joint of the lower horizontal connecting member of the 5 # main truss; Under the combined action of the geological environment, the lateral pressure of artificial fill and the increase of water pressure caused by water leakage after the water pipe break, the pier body is tilted sideways, which is caused by the geological environment and the lateral pressure of artificial fill and the increase of water pressure caused by water leakage after the break of water pipe. 3) according to the disease of Wanzhou Bridge, the reinforcement method is put forward: the end beam is strengthened by steel plate / concrete composite structure to enlarge the section, and all the supports are replaced; 3) according to the disease of Wanzhou Bridge, the reinforcement method is put forward. The 7 # pier is protected by pile reinforced concrete tube, and the transverse beam is set up between the piles and separated from the bridge pier, and the crushed concrete at the connection between the 5 # pier and the horizontal connecting member under the main truss is strengthened by pasted steel plate. Repairing the shedding concrete at the joint between the 11 # pier and the 12 # platform; 4) the reinforcement design of typical diseases and other diseases of Wanzhou Bridge is summarized at the end of the paper, which provides a good guidance and reference value for the optimization of the design and construction of CFST continuous rigid frame bridge in the future.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.71
本文编号：2439888
[Abstract]:Concrete-filled steel tube continuous rigid frame bridge has been favored by bridge engineers because of its high bearing capacity, good seismic performance, convenient construction and good comprehensive economic benefit. In China, it has been successfully applied in Wanzhou Dahegou Bridge, and then in Wanzhou Bridge and Xiangjiaba Bridge. In foreign countries, concrete filled steel tubes (CFST), concrete filled steel tubes (CFST) and thin wall concrete filled steel tubes (CFST) are mainly studied, and the core concrete is made of plain concrete or reinforced steel or section steel. The application of concrete-filled steel tube (CFST) continuous rigid frame bridge is not mature, and it is not perfect in theory and engineering technology. There are some defects in the built bridge, such as the deflection and lateral stability of high pier caused by nonlinear temperature distribution. Excessive temperature difference causes problems such as steel tubes and concrete emptying. Based on the project of Wanzhou Bridge and the actual situation of Wanzhou Bridge, this paper expounds the disease, causes and maintenance measures of CFST continuous rigid frame bridge, which provides practical reference for the design and construction of similar bridges. The main research contents include the following aspects: 1) in view of the operation of Wanzhou Bridge, summarize the existing diseases: 4, 9 # pier, the lower support completely lost the support slip function; 4), the top concrete of the 9 # end beam is seriously cracked, the steel bar is exposed, and there are transverse through cracks and oblique cracks; the 5 # pier and the lower horizontal connecting member of the main truss are partially crushed by the concrete; the 7 # pier is inclined sideways, and there are oblique cracks in the transverse beam, and the concrete is broken in the section between the 5 # pier and the horizontal connecting member of the main truss. Between 11 # pier and 12 # abutment, the concrete is removed from the joint between the bridge deck and the 12 # abutment. 1 0 # pier foundation exposed. 2) analyze the causes of the disease of Wanzhou Bridge: the end beam is located at the end of the rigid frame, because the support can not be reset, the end beam and pier bear a great external force, and after the pier deforms to a certain extent, The external force all acts on the beam steel tube and concrete. Because of the small thickness of concrete and the limited number of steel bars, it can not bear the huge deformation force, which leads to a large number of cracks and concrete breakage and shedding. The concrete is crushed because of the inconsistency between the deformation of the steel member and the concrete member at the joint of the lower horizontal connecting member of the 5 # main truss; Under the combined action of the geological environment, the lateral pressure of artificial fill and the increase of water pressure caused by water leakage after the water pipe break, the pier body is tilted sideways, which is caused by the geological environment and the lateral pressure of artificial fill and the increase of water pressure caused by water leakage after the break of water pipe. 3) according to the disease of Wanzhou Bridge, the reinforcement method is put forward: the end beam is strengthened by steel plate / concrete composite structure to enlarge the section, and all the supports are replaced; 3) according to the disease of Wanzhou Bridge, the reinforcement method is put forward. The 7 # pier is protected by pile reinforced concrete tube, and the transverse beam is set up between the piles and separated from the bridge pier, and the crushed concrete at the connection between the 5 # pier and the horizontal connecting member under the main truss is strengthened by pasted steel plate. Repairing the shedding concrete at the joint between the 11 # pier and the 12 # platform; 4) the reinforcement design of typical diseases and other diseases of Wanzhou Bridge is summarized at the end of the paper, which provides a good guidance and reference value for the optimization of the design and construction of CFST continuous rigid frame bridge in the future.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.71
【参考文献】
相关期刊论文 前1条
1 蔡绍怀;我国钢管混凝土结构技术的最新进展[J];土木工程学报;1999年04期
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