PSI Instrument

Description

PSI Instrument uses the well-known Parallel Seismic method to establish the depth of existing foundations (specifically piles) where the superstructure precludes access to the pile heads. The test requires the installation of a plastic access tube in parallel, and as close as possible, to the tested pile. The tube should be carried down to a depth exceeding the assumed pile length by a margin of 8-10 m and filled with water. In unsaturated soils the tube should be firmly grouted in the hole to achieve good acoustic coupling with the surrounding soil.

System Components

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System Components
  1. PSI instrument
  2. Sledgehammer with a trigger switch
  3. Digital depth meter
  4. Hydrophone

* PSI2 is complaint with AFNOR NF P94-160-3

Operation

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Wave Respons Display

As the hydrophone is lowered in stages inside the access tube, the superstructure is hit with the hammer and the pulse arriving at the hydrophone is recorded in the PC that is connected to the instrument. When all the pulses thus collected are plotted versus the respective depths, they show a typical break in the slope at the depth where the pile tip is located.

Advantages

  • Ease of use: It is usually self-taught in less than a day. No additional expensive training is needed.
  • Connects to any PC/Laptop via a standard USB port.
  • Interpretation assistance and Second Opinion Services (SOS) included

Spesification

PhysicalHousingRugged, Environment-proof,
Dimensions (mm)210W x 140L x 40H (instrument only)
Weight0.8 kg (instrument only) 2.3 kg (with typical computer) 13.0 kg (Typical shipping)
Temperature rangeOperating : -25 to 50 (°C) Storage : -40 to 70 (°C)
PowerExternal—USBOperate on the USB connection to the tablet or computer device.
StandardsAFNOR NF P94-160-3Fully meets or exceeds
TechnicalHydrophone100Hz ~ 4kHz in stainless enclosure. 25 mm diameter
CablesHeavy-duty polyurethane on reel.
Sample rate50kHz (20μS resolution)
Gain16bit A/D + 14 gain levels = 30bit dynamic range.
Depth3mm resolution
PerformancePile lengths1m to 50m
Productivity10-15 min (depending on pile length) per pile
StorageUnlimited
RequirementsComputer (32/64 bit)Windows 7/8/10. 800x600 resolution or higher
OutputReportingArrival time vs. depth Pile tip depth Wave speed in pile
LanguageMulti-lingual report generation in MS Word format
DepthCable reels50m lengths

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