连续刚构梁梁体施工裂缝预防与防治方法

发布时间：2018-01-30 15:48

本文关键词： 大体积混凝土结构连续刚构梁温度裂缝降温管测温监控　出处：《土木建筑与环境工程》2014年S1期 　论文类型：期刊论文

【摘要】：大体积混凝土结构由于内外因素的作用不可避免地存在裂缝,而裂缝是混凝土结构物承载能力、耐久性及防水性降低的主要原因。按照产生原因,混凝土裂缝主要分为塑性收缩裂缝、沉降收缩裂缝和温度裂缝。三种裂缝产生原因各不相同。小跨度连续刚构桥梁体采用非预应力现浇梁,没有了预应力,构件抗裂性大大降低,裂缝在施工过程中的控制与预防也更为重要。本文针对这三种裂缝产生的原因,采用梁体支架预压变形观测、设置降温管、梁体表面蓄水等措施有效对裂缝进行了预防与控制,在工程实际应用中效果显著。
[Abstract]:Because of internal and external factors, cracks inevitably exist in mass concrete structures, and cracks are the main reasons for the reduction of bearing capacity, durability and waterproofing of concrete structures. Concrete cracks are mainly divided into plastic shrinkage cracks, settlement shrinkage cracks and temperature cracks. The causes of the three cracks are different. Non-prestressed cast-in-place beam is used in the beam of small span continuous rigid frame bridge without prestress. The crack resistance of members is greatly reduced, and the control and prevention of cracks in the construction process is more important. In view of the causes of these three cracks, the beam support pre-compression deformation observation is used to set the cooling pipe. The measures such as water storage on the surface of beam body are used to prevent and control cracks effectively, and the effect is remarkable in engineering practice.
【作者单位】：中铁十八局集团有限公司;
【分类号】：U445.4
【正文快照】： 随着近几十年交通运输事业的飞速发展,预应力混凝土连续刚构桥凭借其经济实用、行车平顺舒适及不需要转换体系等一系列优点,成为大跨径桥梁选型里极具竞争力的桥型之一。但与此同时,随着大跨径连续刚构桥的大量修建,箱梁梁体混凝土出现各种不同性质的裂缝问题,不仅破坏了桥梁

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