钢结构(包括设备、容器的钢支架)与混凝上或钢筋混凝土基础大多采用螺栓连接。安装时为了使结构的标高符合设计要求,传统的做法是在架柱底座和基础顶面之间加垫铁调平,然后用细石混凝土或砂浆对空隙进行二次灌浆。采用这种方法安装一个支架至少要用4组共8块垫铁,底座中间的二次灌浆难以灌注密实。中国石化总公司北京设计院的同志吸取国外钢结构支架安装的长处,在设计中改垫铁安装为无垫铁安装,具体作法是: 先在基础顶部中间堆放一堆细石混凝土或100号水泥砂浆,并盖上一块方形钢板,再用水 Steel structures (including steel supports for equipment and vessels) are mostly bolted to concrete or reinforced concrete foundations. In order to meet the design requirements for the elevation of the structure during installation, the conventional method is to add horns between the frame base and the top surface of the foundation, and then use a fine stone concrete or mortar to perform secondary grouting on the voids. The use of this method to install a bracket must use at least four groups of eight horns. The secondary grouting in the middle of the base is difficult to perfuse and compact. The comrades of the Beijing Design Institute of China National Petrochemical Corporation absorbed the advantages of the installation of foreign steel frame brackets. In the design, the horn was installed as a hornless installation. The specific approach was: First pile up a pile of fine stone concrete or 100 cement in the middle of the top of the foundation. Mortar, covered with a square plate, and then water