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随着桥梁建设事业的发展,大跨连续刚构桥大量涌现,在促进我国桥梁建设事业发展的同时,其施工风险也备受关注。对于大跨径连续刚构桥而言,其合拢段施工对于全桥施工质量具有决定性影响。然而由于施工工艺以及施工设计等各方面因素的影响,在其合拢段施工实践中,常常会产生梁底板混凝土崩裂的问题,严重威胁着连续刚构桥的施工质量。基于此,深入分析其施工中的梁底崩裂风险,找出有效的预防措施,对于提升桥梁施工质量具有重要的现实意义。本文以大跨径连续刚构桥的施工为着眼点,在简述了连续刚构桥的受力特点的基础上,结合工程实际,重点分析了合拢段施工梁底板崩裂风险的引发因素,以及梁底崩裂风险的预防措施,以期为桥梁施工提供有力的参考。
With the development of bridge construction, large-span continuous rigid frame bridges have emerged in a large amount. At the same time of promoting the development of bridge construction in our country, the construction risks have also drawn much attention. For the long-span continuous rigid-frame bridge, the construction of its closed section has a decisive influence on the construction quality of the full-bridge. However, due to the influence of various factors such as construction technology and construction design, in the construction practice of its closed section, the problem of cracking of the concrete of the floor slab often occurs, which seriously threatens the construction quality of the continuous rigid frame bridge. Based on this, in-depth analysis of the risk of beam bottom cracking during construction and finding out effective preventive measures have important practical significance for improving the quality of bridge construction. This paper focuses on the construction of long span continuous rigid frame bridge. Based on the brief description of the mechanical characteristics of continuous rigid frame bridge and the engineering practice, this paper mainly analyzes the triggering factors of the risk of cracking of the floor slab in closing section, Prevention of the risk of beam bottom cracking, with a view to provide a strong reference for the construction of the bridge.