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在煤矿地面建筑中,钢结构柱底和地脚螺栓预留洞的混凝土二次浇灌问题,关系着厂房结构安全和重要设备安装的质量。要求二次浇灌的混凝土有足够强度,还要求它无收缩,与周围的混凝土(或钢柱底板)紧密粘接,不得有收缩裂缝。目前国内通常采用的方法是使二次浇灌的混凝土标号比原混凝土标号提高一级或使用膨胀水泥混凝土。 在我国现行的施工规范中,还没有无收缩混凝土的内容。对混凝土无收缩性能一般
In the ground construction of coal mines, the problem of secondary watering of concrete at the bottom of the steel structure and reserved holes in the anchor bolts is related to the structural safety of the plant and the quality of the installation of important equipment. The second-irrigated concrete is required to have sufficient strength, and it is also required to have no shrinkage, adhere tightly to the surrounding concrete (or steel column floor), and have no shrinkage cracks. At present, the commonly used method in China is to make the secondary irrigated concrete mark one level higher than the original concrete mark or use the expanded cement concrete. In China’s current construction code, there is no content of non-shrinkage concrete. Non-shrinkage performance on concrete