- Manual selector
Before starting a driving stage, the operator must manually operate a lever which prepares the selector for the command of the inner or outer rod. - Hydraulic selector
During the driving stage the rods are operated automatically by a hydraulic command. The operator must simply control the driving movements for insertion of the rods.
Aquisition system
The values measured by the load cell are acquired by an electronic device fixed to the selector, known as the “Acquisition system”.
TGAS11
The values acquired by the load cell are shown on the display of the TGAS11 unit.
The operator must manually write down the readings displayed during insertion:
- RP = First reading made, relating to insertion of the bit only.
- RP+RL = Second reading made, relating to the insertion of the bit + side sleeve.
- RT = Third reading made, relating to the insertion of the outer rods.
The TGSW01 software allows calculation of the bit force, side friction and total resistance values. The RP/RL ratio (Begemann 1965 ratio) and RL/RP ratio (Schmertmann 1978 ratio – FR%) are also calculated.
TGAS05v2
The values acquired by the load cell are shown on the display of the TGAS05v2 unit.
The operator can download the readings after performing the CPT test:
- RP = First reading made, relating to insertion of the bit only.
- RP+RL = Second reading made, relating to the insertion of the bit + side sleeve.
- RT = Third reading made, relating to the insertion of the outer rods.
The TGSW01 software allows calculation of the bit force, side friction and total resistance values. The RP/RL ratio (Begemann 1965 ratio) and RL/RP ratio (Schmertmann 1978 ratio – FR%) are also calculated.
Pagani Geotechnical Equipment also supplies the accessories (Begemann bits, rods, load cells) necessary for performing CPT tests.