GRL

Shaft Quantitative Inspection Device (SQUID)

A new technology for quantitative, real-time assessment of the cleanliness and competency of the bottom surface of bored pile or drilled shaft foundations

  • Measures both the thickness of soft material or debris that might be covering the bearing strata, providing force and displacement in numerical and graphical form
  • An objective, quantitative assessment is reported through accurate displacement and penetrometer pressure measurements, digitally processed and sent wirelessly from the drilled location to the SQUID tablet
  • Quickly and efficiently attaches to any drill stem or Kelly bar for optimal deployment cycle time
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The Shaft Quantitative Inspection Device (SQUID) system is a new technology for quantitatively assessing the quality of the bottom surface of a bored pile or drilled shaft. It measures both the thickness of soft material or debris that may be covering the bearing strata, providing a force and displacement in numerical and graphical form.

An important part of bored pile construction is the cleaning and inspection of the bottom of the hole prior to the placement of reinforcement and concrete. To achieve cleaning once drilling is complete, a cleanout bucket is typically used to remove any material unsuitable for end bearing support. Bottom inspection is then performed, often by lowering a camera down the bore hole, a procedure that gives a rough idea of the thickness of any debris left at the bottom. To improve the inspection method, SQUID takes accurate displacement and penetrometer measurements, providing an objective, quantitative assessment.

The system includes: the SQUID Body, with a drill stem adaptor, typically three contact plates, instrumented cone penetrometers and displacement transducers; a cable reel; a wireless transmitter; and the SQUID Tablet. The penetrometers have standard 10 cm2 tip area. The penetromenter pressure is measured by resistance strain gages arranged in a Wheatstone bridge.

Shaft Quantitative Inspection Device* (SQUID) Specifications

February 2016
PDF Format

SQUID Body

  • Size (height x hexagon largest diagonal): 629 x 647 mm (24.75 x 25.5 inches)
  • Weight (including penetrometers and contact plates): 188 kg (415 lbs)
  • Material: Stainless Steel and Aluminum
  • Standard Kelly bar connection sizes: 101.6 mm² (4 in²), 152.4 mm² (6 in²), 203.2 mm² (8 in²)
  • Cable Length: 61 m (200 ft) standard; 152m (500ft) cable length optional
  • Temperature Range: -20 to 55°C operating; -40 to +85°C Storage
  • Applied force limit: 135 kN (30 kips)

SQUID Penetrometers

  • Material: Stainless Steel
  • Number of penetrometers: 3 standard
  • Penetrometer tip: area 10 cm² (1.55 in²) standard, larger tips optional; replaceable
  • Maximum penetrometer pressure: 100 MPa (14 ksi/2000 ksf)
  • Penetrometer pressure measurement resolution: 0.1 MPa (14 psi/2 ksf)
  • Maximum depth of penetration: 150 mm (6 in)

SQUID Contact Plate(s)

  • Size: 152 mm (6 in) OD; 46 mm (1.8 inch) ID; thickness 25.4 mm (1 inch)
  • Weight each contact plate assembly: in air 6.75 kg (14.9 lbs); in water: 5.85 kg (12.9 lbs)
  • Contact Plate pressure (free to move): in air 4 kPa (0.58 psi/0.083 ksf); in water 3.5 kPa (0.50 psi/0.072 ksf)
  • Contact plate displacement measurement resolution: 0.004 mm (0.0002”)
  • Maximum contact plate movement: 150 mmm (6 in)

Wireless Transmitter

  • Transmission Range: 100m
  • Frequency: 2.4 GHz
  • Output power: 18 dBm
  • Mounting: On cable reel
  • Temperature Range: -10 to 55°C operating; -20 to 70°C storage

SQUID Tablet

  • Size: 320 X 250 X 68 mm (12.6 x 9.8 x 2.7 inches)
  • Weight: 5 Kg (11 lbs.)
  • Temperature range: 0 to 40°C operating; -20 to 65°C storage
  • Display: 26.4cm (10.4”), sunlight readable, resolution 1024 X 768; capacitive touch screen
  • Video Outputs: HDMI, VGA
  • Battery Power: 4 hour continuous data collection 12 V battery + back-up battery standard
  • Charging time: 6 Hours max; 120/240 charger input voltage
  • Operating System: Microsoft Windows® 7
  • Data storage and ports: 60 GB SSD internal drive; Ethernet port; 4 USB ports
  • Optional external accessories: USB keyboard and mouse
  • Remote Operation: SQUID Tablet is equipped for high speed internet access and remote operation
  • Technical support: SQUID Tablet is equipped for remote error checking and updating
  • Units of operation: Traditional US, SI, or Metric
  • Full one year warranty on parts and labor

*Patent Pending

The SQUID includes a full warranty and technical support. PDI offers expert training in the use of the SQUID.