我厂过去使用的预制构件钢模,其侧帮采用楔销在四角固定,或用顶固杆固定(见图1)。经我厂多年使用证明均有不足之处。楔销四角固定,因楔销是靠锤击打入楔孔,其头部常被打坏,楔面经多次使用后也被挤坏,不能继续使用,而且常随落地灰渣而被清除,丢失严重,每年需要增加大量的新销,浪费很大。采用图1所示的顶固杆,其缺点是常自箭头a所指的小轴根部焊口处因锤击开焊而脱落,每年需要花大量的工时进行维修,脱落的顶固杆还常随清理 The prefabricated steel mold used by our factory in the past, the side of the use of wedges fixed in the four corners, or fixed with a fixed rod (see Figure 1). After years of use in our factory, there are shortcomings. Pins are fixed at four corners, because the pin is hammered into the wedge hole, the head is often damaged, the wedge surface is also damaged after repeated use, can not continue to use, and is often cleared with the ground ash , Loss of serious, need to increase a large number of new sales each year, a great waste. The use of the top rod shown in FIG. 1 has the disadvantage that it often falls off from the weld at the root of the small shaft pointed by the arrow a. It takes a lot of man-hours to repair every year, and the removed top rod is also often used. With cleanup