Pile Driving Analysis

Pile Driving Analysis (PDA)

Control and monitoring of the total pile installation process of driven piles. The Allnamics equipment and software for Pile Driving Analysis makes it possible to monitor the performance during driving of pile, hammer and soil. Controle the stresses in the pile, the  enthru energy in the pile, soil resitatnces, etc.

 

Key Characteristics

  • Option to transmit data wirelessly by Wi-Fi or by cable or use it as a standalone recording device
  • High resolution, easy to operate
  • Intelligent sensors & real time sensor control
  • Option of with AllWave-DLT for Signal Matching for DLT
  • Possibility to export signals for Dynamic Load Testing, fatigue analysis and way more
  • Sleep function to delay start of monitoring with hours, days or weeks
  • Optimised for use by civil, geotechnical and foundations engineers
  • Extensive reporting options in either PDF and MS Word format
  • Fully compliant with international standards (ASTM, EuroCode, etc.)
  • Supported by the Allnamics Team with more than 50 years of experience

Allnamics' PDR is the wireless data acquisition unit for Static, Rapid and Dynamic Load Testing

Allnamics PDR: Wireless data acquisition with high resolution for registration dynamics and stress wave phenomena in piles.
Allnamics PDR: Wireless data acquisition with high resolution for registration dynamics and stress wave phenomena in piles.

Wireless monitoring avoids cable handling during onshore and offshore Dynamic Load Testing

Dynamic Load Testing for both offshore and onshore piles, concrete or steel, bored or driven
Wireless Dynamic Load Testing for both offshore and onshore piles, concrete or steel, bored or driven

Pile Driving Analysis (PDA) 

The total process of pile installation during driving can be monitored with the Allnamics PDA set. PDA stand for pile driving analysis or pile driving monitoring. Parameters of hammer, pile and soil can be monitored to optimize the pile driving process and hammer efficiency, the condition of the pile cushioning, to avoid problems i.e. by limit the pile stresses in both compression and tension, to monitor the behaviour of the soil, entrance in or passing of soil layers and to control the performance related to driveability studies and soil investigations.

The same monitoring set-up can be used for Dynamic Load Testing (or High Strain Dynamic Testing), when the precast pile is redriven after a set-up period, or when an impact is given on cast-in-situ piles. Elaboration of the signals by the Signal Matching technique of AllWave-DLT lead to prediction of the static load-settlement behaviour (DLT).

Pile Driving Analysis (or PDA) reduces the risk of damage to both the pile and the hammer and allows the contractor to drive the pile efficiently to the optimum or required depth.

 

Dynamic Load Testing (DLT) 

PDA and DLT are often confused. Pile Driving Analysis is basically monitoring and control of the pile driving process, for hammer, pile and soil performance.

Dynamic Load Testing (or High Strain Dynamic Testing) can be a fast and cost-effective alternative to Static Load Testing of both concrete and steel piles. During the test, a load is applied to the pile by either an impact hammer or a suitable drop weight. The generated stress wave travels down to the pile toe and back up again to the top of the pile. Near the pile top the stress waves are captured by measuring the strain and acceleration. These signals can than be analysed to assess the pile capacity.

PDR FOR DATA ACQUISITION

Allnamics has developed a state-of-the-art multi-purpose monitoring system, the PDR. Designed by a multi-disciplinary design team, the PDR meets the pile testing requirements on the construction site in every respect. Options include continuous monitoring of strain and acceleration during pile driving (PDA) as well as single blow registration for Dynamic Load Testing (DLT), whether at the end of driving or during re-strike. Data collected for DLT can be exported for further analysis with AllWave-DLT Signal Matching software.

 

THE MONITORING SENSORS 

Each measuring system includes two combined sensors for measuring strain and accelerations. The sensors are delivered with a multipurpose template. This template is used for protection of the sensors during transport and mounting. It is also used as a drilling template ensuring the exact positions of the two holes to be drilled for each combined sensor. Finally it contains all necessary mounting materials (i.e bolts and Allen key)

The mounting of the sensors can be monitored by the PDR, to ensure stress free instrumentation.

The status of the sensors is also continuously monitored before and during monitoring. On the screen of the field computer the condition of all sensors is presented in real-time.

 

Above or Under Water?

Offshore piles are often driving into the soil, using an impact hammer that can drive pile under water. As a a result, special PDA-sensors for application Under Water has been developed, able to resist the high pressure of many (hundreds of) meters of water depth.

 

ALLWAVE SIGNAL MATCHING for DLT signals

AllWave is a Wave Equation Analysing Program (WEAP) based on the Method of Characteristics for one-dimensional stress waves and offers the possibility to simulate the soil behaviour according to various soil models (TNO, Smith and Randolph).

During the Signal Matching process for Dynamic Load Testing, the soil model is adjusted until a good match between the calculated and measured upward travelling wave is obtained. The upward travelling wave contains information on the interaction between soil and pile shaft and toe.

The initial soil model is based on the soil investigation results. CPT’s, SPT’s and other soil investigation results can be imported digitally or digitized using the AllWave Soil Digitizer. Manual input of soil layers and soil parameters is possible as well.

The Signal Matching process is enhanced by several utilities, including AutoMatching support.

 

SPECIFICATIONS AND CODES

Allnamics equipment for Pile Driving Analysis is in compliance with a.o. ASTM D4945, and EuroCode EN ISO-22477-10, EMC, ESD.

ADVANTAGES

  • Wireless transmit data by Wi-Fi or by cable or use it as a standalone recording device
  • High resolution, easy to operate
  • Intelligent sensors & real time sensor control

 

More info…

If you want to know more about the equipment for PDA, please contact us at info@allnamics.com

Allnamics PDA, Pile Driving Analysis on open steel piles

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Connecting the instrumented rods of the Allnamics SPT Energy MonitorAllnamics VDA- Vibratory Driving Analysis