Dynamic Load Testing

Dynamic Load Testing

High strain dynamic load testing for all type of foundation piles and deep foundations. Wireless monitoring equipment for Dynamic Load Testing, including AllWave-DLT Signal Matching software

test method for determining the static load capacity of piles in compliance with ASTM D4945 and EuroCode NEN-EN-ISO 22477-4.

 

Key benefits

  • Wireless transmitting data by Wi-Fi or cable or as a standalone recording device
  • High resolution, easy to operate
  • Intelligent sensors & real time sensor control
  • Complete with AllWave-DLT for Signal Matching
  • Supported by the Allnamics team with more than 50 years of experience
  • Optimised for use by civil, geotechnical and foundations engineers
  • Extensive reporting options to PDF and MS Word format
  • In compliance with international standards (ASTM, EuroCode, etc.)

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

Dynamic Load Testing (PDA/DLT)

High Strain Dynamic Testing (or Dynamic Load 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 strain and acceleration. The signals are processed and analysed to assess the pile capacity.

During pile driving the same set-up can be used to monitor and analyse the performance of the hammer, the condition of the pile cushion, the driving stresses and the pile driving process in general. This so-called 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 to the optimum depth.

PDR WIRELESS DATA ACQUISITION UNIT

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) and single blow registration for Dynamic Load Testing (DLT) 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. Per combined sensor only two holes have to be drilled. 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 holes to be drilled. Finally it contains all necessary mounting materials (i.e bolts and LN key)

The mounting of the sensors is directly controlled by the PDR. During mounting the performance of the sensors is continuously measured ensuring stress free instrumentation.

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

 

ALLWAVE SIGNAL MATCHING 

AllWave is a Wave Equation Program 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 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 supported by several utilities, including AutoMatching support.

 

SPECIFICATIONS AND CODES

Allnamics equipment for Dynamic Load Testing is in compliance with a.o. ASTM D4945, and EuroCode EN ISO-22477-10, EMC, ESD.

ADVANTAGES

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

Dynamic Load Testing in Interlaken, Switserland

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