二次分层浇筑工艺及入模温度对大体积框架桥涵温度及应力影响  

Effect of Secondary Layered Casting Technology and Molding Temperature on Temperature and Stress of Large Frame Bridges and Culverts

作　　者：蒋勇 于天佑 杨青山 金省华 杨玫[4] 施建波 JIANG Yong;YU Tianyou;YANG Qingshan;JIN Shenghua;YANG Mei;SHI Jianbo(Zhejiang Local Railway Development Co., Ltd., Hangzhou 310013, China;Lanzhou Jiaotong University, School of Civil Engineering, Lanzhou 730070, China;Zhejiang Railway Construction Engineering Co., Ltd., Hangzhou 310006, China;Hangzhou Railway Design Institute Co., Ltd., Hangzhou 310060, China;Jiangsu Leiwei Construction Engineering Co., Ltd., Nanjing 210003, China)

机构地区：[1]杭州地方铁路开发有限公司,杭州310013 [2]兰州交通大学土木工程学院,兰州730070 [3]浙江铁道建设工程有限公司,杭州310000 [4]杭州铁路设计院有限责任公司,杭州310006 [5]江苏雷威建设工程有限公司,南京210003

出　　处：《交通科技》2019年第5期92-96,共5页Transportation Science & Technology

摘　　要：以宁波市某下穿铁路框架桥涵项目为依托,采用数值分析方法研究二次分层浇筑对框架桥温度及应力的影响。研究结果表明:采用二次分层浇筑的框架桥涵最高温度比一次整体浇筑法施工小5 ℃左右,温差小约2~3 ℃;一次整体浇筑的混凝土外表面拉应力会在浇筑后第10 d出现2.0 MPa左右的应力峰值,而二次分层浇筑箱涵侧板外表面拉应力则一直呈增长趋势,侧板内侧在浇筑后2~3 d时出现0.6~1.0 MPa的压应力。Based on the project of mass concrete of the frame bridge and culvert under the railway in Ningbo, the influence of secondary layered casting on the temperature and stress of the frame bridge is studied by numerical analysis method. The results show that the maximum temperature of the frame bridge and culvert with secondary layered casting is about 5 centigrade lower than that of the integral casting, and the temperature difference is about 2~3 centigrade smaller. Tensile stress on the outer surface of concrete poured in one step will reach a peak value of about 2.0 MPa on the 10th day after pouring, while the tensile stress on the outer surface of side slab of box culvert poured in two layers will keep increasing, and the compressive stress on the inner side slab will reach 0.6~1.0 MPa on the 2nd to 3rd day after pouring.

关 键 词：框架桥 二次浇筑 入模温度 温度收缩 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]