打夯，指用夯把地基砸实。回填室内的土，做好地坪，要能确保日后地坪受压不再塌陷。所以夯实土是使做好的地坪不至于塌陷的关键工序。
打夯以后，地基就瓷实了。
挖土、运土和打夯工作大部分用机器进行。
Most of the digging, moving and compressing of earth was done by machines.
在压路机不能达到的路槽和检查井边缘，采用蛙式打夯机夯实。
Depressed trough, manhole edges and other places where the roller can not reach shall be compacted with frog rammer.
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