Reaming Pressuremeter (RPM)
Insitu direct strain measuring
47mm diameter
10mm arm expansion (42.5% strain)
10MPa working pressure
Ideal for soils and weak rock
Deploy in SPT pocket, pre-bored pocket or push in virgin ground/existing CPT hole
The Reaming Pressuremeter (RPM) is a versatile small diameter pressuremeter (Ø47mm OD). This probe can be used in materials ranging from weak rock such as weathered chalk, to very weak clays.
Insertion techniques for the RPM can be either by pushing with hydraulic rams, or, pre-boring with an SPT split spoon, 50mm drag bit or a rotary core barrel.
This instrument can be configured to take a 15cm2 live cone (CPT), thus changing the instrument from a Reaming Pressuremeter to a Cone Pressuremeter. The CPT operates entirely separately to the Pressuremeter.