The extruder is a new equipment applied to construct ing multi-stage di sk pile hole by extruding and expanding.The disk pile constructed by the extrud er is a variable-cross section pile.

• 挤扩支盘成型机是用于挤扩多支盘砼灌注桩施工的一种新型设备，其成桩机理是靠高压能量的油泵推动油缸活塞运动而工作的。