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随着经济飞速发展,现代建筑往天空越盖越高,往底下越挖越深,伴随而来的,是构件尺寸的增大,巨型框架,巨型转换梁,筏板承台的应用越来越普遍。由于混凝土结构形成过程中,在水化作用下,大体积混凝土施工时会产生很高的温度,使混凝土构件内外温差较大,影响结构的耐久性和安全性,产生温度裂缝。因此有效地控制温差是大体积混凝土施工的重要措施。而控制大体积混凝土内外温差的方法有很多,平常用得最多且最经济的是将大体积混凝土分层浇筑,新旧混凝土交接部位,除了后浇筑混凝土收缩产生剪应力外,新旧混凝土材料之间的咬合力是否满足整体性要求,是叠合面不出现受力裂缝的关键,本文通过数学模型方法,得出叠合面应力方程,帮助施工选择分层的厚度,具有现实意义。
With the rapid development of economy, the higher the height of the modern building is to the sky, the deeper it digs. The accompanying increase of the size of the components increases the application of mega-frame, giant conversion beam and raft cap. universal. Due to the formation of concrete structure, under the hydration, mass concrete construction will produce very high temperature, so that the temperature difference between the inside and outside of the concrete structure is larger, which will affect the durability and safety of the structure, resulting in temperature cracks. Therefore, the effective control of temperature is an important measure of mass concrete construction. There are many ways to control the temperature difference between large and medium-sized concrete. The most commonly used and most economical method is to put large-volume concrete into layers and pour new-old concrete. In addition to the shear stress caused by shrinkage of post-poured concrete, Whether the occlusal force satisfies the integral requirement is the key point that the stress fracture will not occur on the overlapping surface. In this paper, the mathematic model method is used to derive the stress equation of the overlapping surface and help to select the layer thickness for the construction, which is of practical significance.