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地脚螺丝预留孔是为了准确安装设备而设的。一般要求位置正确,深度符合设计要求,同时洞内的混凝土面不宜过分光滑,以保证二次灌浆后结合良好。目前做预留孔的方法很多,但大都存在不少缺点,长期以来没有很好解决。预留孔有圆形、方形、长方形三种,深度一般在500～1000毫米之间。就结合强度而言,圆的不如方的优越,但在施工上圆的比方的方便。做圆形预留孔的方法,现在看来用上大下小的圆木棒、钢管或能伸缩的铁皮筒比较简便易行。这种方法一般现场取材容易,固定方便,拆除也很简便。在混凝土打好3～4小时后,将木棒等微微向上转动,使其与混凝土脱离,待混凝土达到一定强度后,旋转拔除即可。
The anchor bolt hole is designed to accurately install the equipment. Generally, the position is correct and the depth meets the design requirements. At the same time, the concrete surface inside the cave should not be excessively smooth to ensure a good combination of secondary grouting. At present, there are many methods for making holes, but most of them have many shortcomings that have not been resolved for a long time. There are three kinds of reserved holes: round, square, and rectangular, and the depth is generally between 500 and 1000 mm. As far as the strength of the bond is concerned, the circle is not as good as the square, but it is convenient for construction in terms of roundness. The method of making a round reserved hole now seems to be simpler and easier to use with smaller round bars, steel pipes, or retractable iron cylinders. This method is generally easy to draw on the spot, easy to fix, and easy to remove. After the concrete has been well-grounded for 3 to 4 hours, the wooden rod etc. is slightly rotated upwards to separate from the concrete. After the concrete reaches a certain strength, it can be removed by rotation.