现浇连续梁预应力筋张拉控制技术
2021-11-27刘晓允曹武雷王柯柯
刘晓允 曹武雷 王柯柯
DOI:10.16661/j.cnki.1672-3791.2109-5042-3834
摘 要:随着科学技术的发展,我国预应力现浇桥梁技术迅速兴起,各种能够提高生产效率和功能性的技术被开发并应用于大跨度桥梁的建设中。其中,预应力技术是发展最快、应用最广泛的一门科学,已在我国各个省份得到应用并得到迅速发展。该文对公路桥梁施工中现浇箱梁预应力的施工技术进行了详细阐述,使预应力在现浇连续梁施工中的应用更加广泛。
关键词:桥梁 现浇连续梁 预应力 控制技术
中图分类号:U445.57 文献标识码:A文章编号:1672-3791(2021)09(a)-0052-03
Tension Control Technology of Prestressed Reinforcement in Cast-in-place Continuous Bridge
LIU Xiaoyun CAO Wulei WANG Keke
(China Construction Seventh Engineering Division Co, Ltd., Zhengzhou, Henan Province, 450000 China)
Abstract: With the development of science and technology, prestressed cast-in-place bridge technology is rising rapidly in China. Various technologies that can improve production efficiency and functionality have been developed and applied to the construction of long-span bridges. Among them, prestressed technology is the fastest developing and most widely used science, which has been applied and developed rapidly in various provinces of China. In this paper, the construction technology of prestressed cast-in-place continuous bridge in highway bridge construction is described in detail, which makes the application of prestressed in cast-in-place continuous bridge construction more widely.
Key Words: Bridge; Cast-in-place continuous bridge; Prestress; Control technology
在预应力混凝土结构中,预应力筋的拉应力控制直接影响预应力的效果和混凝土结构的完整性。现浇预应力箱梁的现场施工一般采用双控法:一种是通过观察油泵压力表的压力值来控制张拉力;另一种是利用测得的伸长值和理论计算的伸长值来检查张拉力(误差范围为±6%)。
1 工程概況
上跨新月铁路分离式立交桥路线于修武县城北桩号K22+153.47上跨新月铁路,交叉角度为90°,对应新月铁路的桩号为K40+552.03;于桩号K22+108.1处上跨大沙河,交叉角度为60°;于桩号K22+362.7处上跨幸福路,交叉角度为94°。结合新月铁路现状,采用主线上跨新月铁路的桥梁方案,鉴于大沙河、新月铁路和幸福路相距较近,拟建桥梁一并跨过大沙河、新月铁路和幸福路。现浇箱梁按部分预应力混凝土A类构件设计。
2 现浇连续梁施工介绍
现浇箱梁是目前公路桥梁的主要形式之一。受预应力管道复杂、数量多、预应力管长等问题的影响,现浇箱梁预应力体系往往成为现浇箱梁的主要质量控制点之一。……
