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Providing full service geotechnical drilling and testing services for over 70 years. |
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Seismic Cone Penetrometer Testing (SCPTu) Equipment |
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Pitcher Drilling Company uses a modified CPT cone that contains a built in seismometer to measure compression and shear wave velocities in addition to the standard piezocone parameters (qc, fs, and u2). Therefore, four independent readings are compiled with depth in a single sounding. The standard CPT parameters are recorded continuously while the seismic test is usually performed at 5-foot intervals. Shear waves are generated by striking a seismic beam coupled to the ground surface by a hydraulic cylinder under the CPT rig, Figure SCPTu. Compression waves are generated by striking an auger in the ground. The sledgehammer that strikes the beam/auger acts as a trigger, initiating the recording of the seismic wave trace. Before measurements are taken, the rods are decoupled from the CPT rig to prevent energy transmission down the rods.
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Pitcher Drilling Co. (A wholly owned subsidiary of
Gregg Drilling &
Testing, Inc.) |