客运专线32m整孔箱梁冬季蒸气养护温度控制研究  

Research on the Temperature Control for Stream Maintenance of 32 m Box Girder for Passenger Dedicated Line in Winter

作　　者：张克伟 

机构地区：[1]中铁四局集团第二工程有限公司,江苏苏州215100

出　　处：《铁道工程学报》2009年第11期23-27,共5页Journal of Railway Engineering Society

摘　　要：研究目的:应用于铁路客运专线的32 m整孔箱梁,梁重800 t,冬季预制时,混凝土浇筑后水泥水化放热,致使内部温度升高,内外温差很大,易使表面出现裂缝。采用蒸气养护技术预制混凝土箱梁,可以进一步提高梁的品质,但蒸气养护的温度控制是非常关键的技术。本文通过对混凝土箱梁蒸气养护4个阶段温度控制的研究与分析,提出和确定箱梁冬季蒸气养护温度参数,指导现场混凝土箱梁的预制,确保箱梁的预制质量。研究结论:通过对32 m整孔箱梁冬季蒸气养护温度控制的研究,提出的箱梁冬季蒸气养护4个阶段的温度控制参数和预制工艺,经实施预制的混凝土箱梁各项指标均能满足《客运专线预应力混凝土预制梁暂行技术条件》的有关规定,缩短了预制箱梁的周期,并确保了箱梁的预制质量。为保证工程进度创造了条件。Research purposes： When the 32 m box girder with girder weight of 800 t for passenger dedicated line is precasted in winter, the internal temperature of the girder will rise, the temperature difference between the internal part and external part is big and the cracks easily happen on the girder surface because the heat is given out due to the cement hydration after concrete pouring. The usage of steam maintenance technology to the precasted concrete box girders can further improve the girder quality, but how to control the temperature of the steam maintenance is very important. In this paper, through researching and analyzing the temperature control for the stream maintenance of concrete box girder in four stages, the temperature control parameters for stream maintenance of concrete box girder in winter are offered to guide precasting concrete box girder on site and ensure the precasting quality of the girder. Research conclusions：Through researching temperature control for the stream maintenance of 32 m box girder in winter, the temperature control parameters for stream maintenance of concrete box girder in four stages in winter and the precasting technique of the girder are offered. The application shows all the indexes of the precasted concrete box girder meet requirements of ＂Technical Specifications for Concrete Precasted Girder for Passenger Dedicated Line＂ , the period of precasting the box girder is shortened and the precasting quality of the box girder is ensured. All of these create the foundation of ensuring the construction process.

关 键 词：客运专线 箱梁 蒸气养护 温度控制 

分 类 号：U445.47[建筑科学—桥梁与隧道工程]