Borehole Drilling Method

direct push

notation 4.2 more like this
definition Direct push technology includes several types of drilling rigs and drilling equipment which advances a drill string by pushing or hammering without rotating the drill string. Direct push rigs include both cone penetration testing rigs and direct push sampling rigs such as a PowerProbe or Geoprobe. Direct push rigs typically are limited to drilling in unconsolidated soil materials and very soft rock. Direct push drilling rigs use hydraulic cylinders and a hydraulic hammer in advancing a hollow core sampler, typically no longer than 2 metres, to gather soil and groundwater samples. The core pipe has a valve on top that is used to create a vacuum at the top of the core when pulling the core out of the sediment. The method can be used in up to 5m of water. more like this
narrower delft sampler
broader direct push
geoprobe core
broader direct push
gravity core
broader direct push
kasten core
broader direct push
mackereth core
broader direct push
piston core
broader direct push
window sampler
broader direct push
source more like this
broader core drilling
narrower direct push
in scheme boreholedrillingmethod
is primary topic of direct push