Tag: Shaft

Champ-Q evaluation of concrete quality in deep foundations by the Crosshole Sonic Logging method (CSL)

• Allows for four probes (six profiles) to be pulled at once for ease and efficiency of data collection
• Assesses concrete quality and consistency of drilled shafts and other cast-in-place concrete structures
• Performs real-time analysis on site, as well as data transfer with CHA-W reporting software for additional analysis
• Offers PDI-TOMO, 3-D tomographic software for superior tomographic results of questionable areas

The Cross-Hole Analyzer determines the quality and consistency of the concrete of drilled shafts, slurry walls, bored piles, cast-in-situ piles and other types of concrete foundations. PDI’s Cross-Hole Analyzer (CHAMP-Q) is ideal for testing four probes (six profiles) in just one pull, saving time and money. CHAMP-Q has color coded wires for easy identification of probe receiving/transmitting. The CHAMP-Q meets or exceeds the specifications of ASTM D6760 and several other crosshole sonic logging codes and standards.

Test the entire shaft with CHAMP-Q
Once a shaft is prepared with PVC or steel tubes during construction, transceivers are lowered into the access tubes and probe one will transmit a high frequency signal that travels through the concrete and is detected by the other probes which are acting as receivers. This action is repeated with the other probes being automatically configured as transmitters sequentially allowing up to six profiles to be scanned with a single pull. As these sensors are raised and/or lowered along the length of the foundation, the CHAMP-Q displays and records the strength of the received signal, as well as the time from signal emission to signal arrival as a function of depth.

In CSL testing, scanning various tube combinations for the entire shaft allows evaluation of concrete quality and defect location along the length and by quadrant. With the CHAMP-Q, the user can pull four cables at once, each color coded for easy identification, and via a newly designed, space efficient tri-pod.

The CHAMP-Q Tablet is portable, light and rugged featuring:

• Fast and accurate field measurements
• Large sun light readable color LCD touch screen that is highly visible in all lighting conditions.
  • Optimized data entry for real time analysis onsite (waterfall diagram)
  •  Replaceable battery and USB ports for quick and easy data transfer

CHAMP’s CHA-W Data Processing Software provides powerful tools for data analysis such as:

• Ability to simultaneously review six data profiles
• History mapping of already collected data
• First Arrival Time (FAT) detection
• Easy defect identification
• Two methods of signal strength evaluation (energy or amplitude)

CHA-W reporting tools comprise of user customized graphs and tables:

• Sonic Map – Signal strength versus time and depth in traditional waterfall diagram
• First Arrival Time – Signal travel time from transmitter to receiver, versus depth
• Wave-speed Plot – Wave-speed (an indicator of concrete strength) versus depth
• Wave–speed Table – Wave-speeds, means and standard deviations
• Energy or Amplitude Plot – Signal strength versus depth
• Defect location graphically (horizontal redline) and in table format

Main Unit 

 Physical:

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 (32 to 104° F) operating; -20 to 65°C (-4 to 149° F) storage

Display:  26.4cm (10.4”), sunlight readable, resolution 1024 X 768

Built in capacitive touch screen

Video Outputs: HDMI, VGA

Power: 4 hour continuous data collection with internal 12V battery, or 100 – 240 VAC power supply

Charging Time: 6 Hours max.

Electronic:

Microsoft Windows^® 10 Operating System

60 GB SSD internal drive

Ethernet port

4 USB ports

12 bit analog to digital (A/D) converter

Sampling rate: 500 kHz, 1 MHz and 2 MHz, user selectable (equivalent measuring accuracy 2μs, 1μs and 0.5μs)

Scan rate: 32 scans/seconds

Record size: 250, 500 and 1000 points, user selectable

User adjustable gain, trigger level and transmit power level

Other:

Operates in English or SI Units

Furnished with CHA-W software

Full one year warranty

Technical manual included

Probes

 Physical:

Size:  215 mm length x 25 mm diameter

Element: ceramic

Housing: nickel plated brass

Independent depth encoder for each probe

Maximum measuring distance (probe separation):  3m

 Electronic:

Receiver: tuned to 45 KHz nominal

Transmitter frequency (nominal): 45 KHz

Transmitter voltage: 200, 400, 600 or 800 Volts (user selectable)

Cables

Cable material: heavy duty polyurethane outer jacket

Cable length: 60, 100 or 150 m

Cables spooled over tripod (standard) or with optional Motorized Probe Deployment System (60 m only)

Motorized Probe Deployment System

Main Unit

Size: Two 380mm X 480mm X 405mm spools

Weight: 11.3Kg each

Includes 60 m cable, detachable from spool

Includes depth encoder for each probe, attached to frame

 Motor Control Unit

Size: 240mm X 160mm X 90mm

Weight: 1.6 Kg

Powered by either external battery (8 hours duration), 12VDC car battery, or 100 – 240 VAC with 12VDC converter

Fast charger to recharge the external battery in 4 hours

Variable probe pull rate: 0.150 to 0.915 m/sec (low, medium, high speed selection)

Resettable circuit breaker motor protection

Operating temperature range: 0° to 40°C

Storage temperature range: -10° to 65°C

Other

Includes pulley for placement at the tube

Includes roller guide for routing cable through re-enforcement rebar cage or over casing