Depressed trough, manhole edges and other places where the roller can not reach shall be compacted with frogrammer.
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。
2
The backfill shall be transported with machine and rammed with a frogrammer or a vertical rammer, or rammed with a roller in case of allowable situation.
回填料采用机械运输，夯实采用蛙式夯机或立式夯机进行夯压，允许的情况下采用碾压机进行压实。
3
In this paper, the nonlinear dynamics of Selfpropelled machines with rocked impact, taking Frogrammer which was first devised in our country as an example, is studied.