桥梁顶推施工过程仿真分析

发布时间：2018-10-26 13:24

【摘要】：顶推施工法具有设备简单、无支架、安全、施工工期短、技术含量高、优质、无干扰等特点。我国顶推施工法最早应用于预应力混凝土桥梁,施工技术已经日益完善,但桥梁在施工过程中受力复杂,有必要对其施工过程进行模拟。本文所采用的顶推施工技术在传统顶推上进行了改进,吸收了国内外先进的顶推技术经验,完善了我国对顶推施工法的研究,为同类型工程特点的桥梁施工提供借鉴意义。本文以7孔16m连续梁桥为工程背景,对混凝土连续梁顶推技术以及施工工艺进行阐述;并分析了该桥在顶推过程中的受力和变形。主要研究内容和取得的成果如下:(1)根据7孔16m连续梁桥地理位置、工程特点等因素,研制了一套顶推设计方案。提出了“既有线路外侧桥位支架预制、步履式多点纵向转向顶推”的顶推设计构思。(2)详细介绍了顶推施工工艺在7孔16m连续梁桥的应用。设计了顶推施工的结构和装置,提出沿圆曲线弦线顶推的构思,并研制了可调约束滑道,创新了沿曲线轨迹顶推的施工方法。(3)采用大型有限元分析软件Midas Civil建立了7孔16m连续梁桥的计算模型,分别对主梁和导梁整体安全性进行了分析和验算,以及它们的关键截面进行了受力分析;找出了各个临时墩支反力在顶推过程中的变化规律,并分析其稳定性和结构受力性能。结果表明,该桥的安全性和稳定性均满足要求。
[Abstract]:The push-push construction method is characterized by simple equipment, no support, safety, short construction period, high technical content, high quality and no interference. The push-push construction method was first applied to prestressed concrete bridges in our country. The construction technology has been improved day by day, but the construction process of the bridge is complicated in the process of construction, so it is necessary to simulate the construction process of the bridge. The jacking construction technology adopted in this paper has been improved on the traditional pushing, absorbing the advanced experience of the pushing technology at home and abroad, perfecting the research of the pushing construction method in our country, and providing reference significance for the bridge construction with the same type of engineering characteristics. Taking 7 holes 16m continuous beam bridge as the engineering background, this paper expounds the pushing technology and construction technology of concrete continuous beam, and analyzes the force and deformation of the bridge during the process of pushing. The main research contents and achievements are as follows: (1) according to the geographical location and engineering characteristics of the 7-hole 16m continuous beam bridge, a set of thrust design scheme is developed. This paper puts forward the design conception of "prefabrication of support at the lateral bridge position of existing line and multi-point longitudinal steering push with step". (2) the application of jacking construction technology in 7-hole 16m continuous beam bridge is introduced in detail. The structure and device of pushing construction are designed, the idea of pushing up along circular curve string is put forward, and the adjustable constrained slide path is developed. The construction method of pushing up along the curve trajectory is innovated. (3) the calculation model of the 7-hole 16m continuous beam bridge is established by using the large-scale finite element analysis software Midas Civil, and the overall safety of the main beam and the guide beam is analyzed and checked respectively. And their key sections are analyzed. The variation law of the reaction force of each temporary pier in the process of pushing is found out, and its stability and the mechanical performance of the structure are analyzed. The results show that the safety and stability of the bridge meet the requirements.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.462

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