摘要
针对某预应力混凝土连续刚构桥零号块浇筑时,由于工期原因无法采用分层浇筑方式而使用一次性浇筑方式所产生的水化热温控问题,提出在零号块的内部空心部分设置贴合内壁的大体积降温水箱为主的方法,以达到控制零号块混凝土水化热温度的目的。首先,采用MIDAS/FEA有限元软件对零号块进行水化热温度场及温度变化的数值模拟。然后,根据模拟结果设计零号块温度测量系统,实时观测零号块混凝土的温度变化。通过对比各个测点温度的计算值和实测值,发现新的温控方法能够有效地将温升峰值控制在76℃以内,最大里表温差控制在20℃以内。
For the pouring of the zero block of a prestressed concrete continuous rigid frame bridge,due to the time limit,the one-time pouring method is adopted,which has caused hydration heat temperature control problems.This paper puts forward a large-volume cooling water tank inside the hollow part of the zero block,so as to control the concrete hydration heat temperature of the zero block.Firstly,MIDAS/FEA finite element software is used to simulate the temperature field and temperature change of the hydration heat of the zero block.Then,according to the simulation results,the temperature measurement system for the zero block is designed to observe the temperature change of the zero block in real time.By comparing the calculated and measured values of temperature at each measuring point,it is found that the new temperature control method can effectively control the peak temperature within 76℃,and the maximum temperature difference within 20℃.
作者
曾章波
裴志勇
王夏
赵永华
ZENG Zhangbo;PEI Zhiyong;WANG Xia;ZHAO Yonghua(Huadong Engineering Corporation Limited,Power China,Hangzhou 311122,China;Kunming University of Science and Technology,Kunming 650500,China)
出处
《贵州科学》
2024年第1期78-84,共7页
Guizhou Science
基金
国家自然科学基金(52068037)
中国电建集团华东勘测设计研究院有限公司科技项目(KY2019-JG-09)。
关键词
大体积混凝土
连续刚构桥
零号块
水化热
温控方法
mass concrete
continuous rigid frame bridge
zero block
heat of hydration
temperature control method
