大体积砼测温方案.doc
大体积砼测温
大体积砼浇筑完毕,只是大体积砼施工的初步成功,如何防止浇筑后的砼在养护期间发生裂缝,尤其是深层裂缝,是大体积砼施工一个极为关键的问题。对浇筑后的砼进行测温监控,随时掌握砼的温度变化动态,并以此来指导砼的养护工作,使养护工作更加科学有效,即实行“信息化”施工。这是大体积砼施工所必不可少的手段。
(1) 测温目的
在施工以前进行必要的砼热工计算, 对砼的内部最高温度、表面温度、温度收缩应力等进行计算,实际是否与其符合,且砼实际温度变化情况究竟如何、养护的效果如何等,只有经过现场测温,才能掌握。通过测温,将砼深度方向的温度梯度控制在规范允许范围以内,同时,通过测温,由于对砼内部温度,各关键部位温差等精确掌握,还可以根据实际情况,尽可能地缩短养护周期,使后续工序尽早开始,加快施工进度,并节约成本。
(2) 布点方案
根据工程平面形状,底板厚度尺寸布点,在
Mass Concrete Temperature
Pouring Mass finished, only the initial construction of mass concrete success, how to prevent the pouring of concrete in the maintenance period after the occurrence of cracks, especially in deep cracks in mass concrete construction an extremely critical issue. Carried out after pouring concrete on the temperature control, keep track of the dynamic change in temperature of concrete and concrete in order to guide conservation work, to make conservation work more scientific and effective, that the implementation of the "information" of the construction. This is essential for mass concrete construction means.
(1) temperature measurement purposes
Necessary before the construction of concrete thermal calculation of the maximum internal concrete temperature, surface temperature, thermal stress and other calculations, the actual meet with her, and concrete changes in how the actual temperature, the effect of how conservation and so on, only after scene temperature, to master. By temperature, the depth of the concrete control the direction of the temperature gradient within specification allows the same time, through temperature, due to the internal concrete temperature, the temperature differences and to understand precisely the critical parts can also be based on the actual situation, the conservation period as short as possible to follow-up process began as early as possible to speed up the construction progress and cost savings.
(2) distribution program
According to project flat shape, size distribution floor thickness, in
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