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(4 to 8 channel WiFi data transmission)

The Pile Driving Analyser (PDA) is a tool to control the pile driving.

It can also be applied for Dynamic Load Testing (DLT) often called PDA Test.

Download Brochure Allnamics Pile Testing Equipment for PDA and DLT (2683 downloads)

Acceleration and strain transducers are mounted near the pile top. The PDR, a data acquisition and data recording unit, is suspended resiliently on the pile and is isolated from high pile driving impact forces and resulting accelerations. Signals are recorded by the PDR and transferred to a (notebook) PC by Wi-Fi or an Ethernet cable. Signals are recorded continuously and analysed by stress wave analysis methods. Results are presented real time as graphics and as text during monitoring.

Field results are immediately available after pile driving. Signals are stored both on the PDR and the PC. The PDR Pile Driving Analyser (PDA) complies with ASTM D4945.

Software for monitoring, analysis, processing and reporting are contained in one program Allnamics-PDADLT. Data collected can be exported for further analysis with AllWave-DLT signal matching software. The first portable pile testing system was developed by TNO in 1984 under the supervision of Peter Middendorp and Fokke Reiding. The system was called  the “Foundation Pile Diagnostic System” (FPDS) and this system could be used for several pile testing applications:

  • Pile Driving Analyser
  • Dynamic Load Tester
  • Sonic Integrity Tester
  • Driveability Analyzer

Under the supervision of the same TNO developers, Allnamics has produced the PDR, an advanced Wi-Fi based pile testing monitoring system that reflects more  than 35 years experience in pile testing, both onshore and offshore.  The PDR can be used not only for Pile Driving Analysis (for both impact and vibratory hammers(VDA)), but also for Dynamic Load Testing and Rapid Load Testing.  The system provides state-of-the-art technology for data acquisition using combined strain and acceleration transducers, and allows  for transducer checking during pile monitoring. The PDR has an internal recorder which backs up all measured signals and  allows standalone automatic monitoring. The PDR-PDA complies with ASTM D4945-12

The PDR- PDA monitoring /analysis and reporting software (Allnamics-PDADLT) runs on Windows 7 and Windows 8 (notebook) PC's equipped with Wi-Fi.So a special monitoring computer is not required although under rough site circumstances the use of a sturdy field (notebook) computer is advised.

Pile Driving Analysis using the PDR has been applied successfully on numerous projects around the world under some of the most challenging operating conditions.

Vibratory Driving Analyser (VDA)


Vibratory driving and impact pile driving are complementary pile installation techniques.
Vibratory driving can be applied to drive piles to final penetration for suitable soil conditions or for stabbing a pile prior to impact pile driving.


Vibratory Driving Analysis (VDA) is a powerful tool to control the vibratory driving process and the extra knowledge obtained by performing Vibratory Driving Analysis can pay for itself many times over.

Hammer frequency, driving forces and stress can be monitored and the final depth of driving can be optimized.


A quality record can be supplied for each pile to the client and authorities immediately after driving.
Finally, for future projects the prediction of vibratory driving performance and selection of the correct vibratory hammer can be improved by incorporating the previous results in the analysis.

The instrumentation for VDA is similar to PDA, except that more sensitive acceleration transducers are used because of the lower acceleration and stress levels during vibratory driving.


During vibratory driving, the VDA records forces, stresses, accelerations, power supplied by the vibratory hammer, eccentric moment, and vibration frequency in combination with the resistance of the soil can be monitored and analyzed. These signals and other information can be presented in real time on the computer screen.

Dynamic Load Tester (DLT)

Dynamic Load Testing (DLT ) is performed as a restrike on precast piles with a pile driving hammer after a set up period or on cast in situ piles by a drop hammer. DLT is often called PDA test.

Pile capacity is obtained by signal matching with AllWave-DLT. The application of DLT is best suited for precast piles. Pile instrumentation is similar as for Pile Driving Analysis (PDA)

DLT is less suited for cast in situ piles, like auger and bored piles. Because of the many assumptions to be made about the inhomogeneous pile properties, like modulus of elasticity, pile shape and the non-unique solution of the signal matching process the pile capacity prediction results become user dependent.

A more reliable alternative for testing cast in situ piles are the Rapid Load Testing (RLT) techniques like StatRapid (STR) or Statnamic (STN).

StatRapid Load Testing Equipment

StatRapid - for Rapid Load Testing (Pseudo Static Testing) of Foundation Piles

StatRapid is an economic and reliable alternative for static load testing, when the performance requirements  (load displacement behaviour and pile capacity) of foundation piles have to checked.

Brochure - StatRapid, A new Rapid Load Testing Application (3001 downloads)

StatRapid specification sheet 4 - 16MN device (1858 downloads)

StatRapid is a joint development of  Cape-Holland and Allnamics. It consist of a Rapid Load Testing device manufactured by Cape-Holland and  monintoring equipment (PDR, Reyca) and belonging prediction, monitoring and analysis software,   manufactured by Allnamics. StatRapid is based on the following concept:

  • Applying a pseudo static long duration load to the pile and soil according rapid load principles .
  • Analysis of measurement results according to user-independent principles (Unloading Point Method – UPM)(CUR 230).
  • Measurements and Analysis Results available on site.
  • Safe and reliable operation of the StatRapid system.
  • Modular drop mass. Amount of mass to be transported can be optimized for the load test requirements
  • Internal hydraulic lifting system for adjustable drop heights up to 4m.
  • Mechanism for catching the drop mass to prevent rebound.
  • Internal drop mass release system.
  • Modular and adjustable elastic-rubber spring system.
  • Method of characteristics based simulation/prediction software (Allwave-RLT) for selecting in advance the right combination of drop mass and spring system for certain pile and soil conditions and to check whether rapid load testing conditions can be met and checking pile stresses
  • Multiple cycles testing with increasing loading cycles for accurate and controlled testing.
  • The loading cycle duration is controlled by the number of springs and the amount of drop mass.
  • The loading cycle peak value is controlled by the drop height.
  • Measurements performed with calibrated load cells, accelerometers and optical measuring device (Reyca) for measuring the dynamic pile head displacement.
  • High quality data acquisition system (Allnamics-PDR) and Wi-Fi data transfer option.
  • Module for Pile integrity testing integrated in the PDR system.
  • Monitoring and reporting software (Allnamics-RLT).
  • Measurements and test procedure in accordance with the ASTM D7383-10, and the draft Euro-code (EN_ISO_-22477-X_ (e)).
  • Analysis of the results according to the Dutch CUR recommendations (CUR 230) taking into account time-dependent effects.
  • Availability of measured signals in ASCII or Excel format allowing  for independent analysis
  • Non-destructive Testing Method.

Brochure - StatRapid, A new Rapid Load Testing Application (3001 downloads)

StatRapid specification sheet 4 - 16MN device (1858 downloads)

 

pdr-on-pile

Pile Testing Equipment: PDR

Allnamics has developed a state-of-the-art multi-purpose monitoring system, the PDR.  The PDR is an advanced Wi-Fi based pile testing monitoring system for Pile Driving Analysis (for both impact (PDA) and vibratory hammers (VDA)), Dynamic Load Testing (DLT or PDA Test), and Rapid Load Testing (RLT -Statnamic(STN) and StatRapid(STR)). 

A multi-disciplinary design team, supervised by Peter Middendorp and Fokke Reiding (the original developers of the first portable pile testing systems, (including the TNO Pile Driving Analyser), created this product, which 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 - or PDA Test) during re-strike.  Data collected for the latter can be exported for further analysis with the AllWave-DLT signal matching software.  Additionally load cell and accelerometer data can be recorded during Rapid Load Testing (e.g. Statnamic™, Statrapid™).

Features:

  • Complies with ASTM D4945-12
  • WiFi or ethernet connection to a Windows PC laptop
  • 4 channels (easy upgrade to 8 channel monitoring)
  • Adjustable sample rate (up to 48 kHz per channel)
  • 24 bit conversion
  • Internal Solid State recorder for signal backup and autonomous monitoring
  • 6 hrs operational battery life (16 hrs standby)
  • Class IP66 housing
  • Robust design with easy magnetic stowaway system for excess transducer cable
  • LEDs for: measurement in progress, test in progress, sensor status, ethernet cable connection active, wifi link active, battery status, battery charging, battery full, transducer connections,  charger connected properly, ethernet cable connected properly, I/O port connection
  • Magnetic cable handling system
  • Intelligent transducers, with transducer key data stored in memory
  • Combined acceleration- and strain transducers
  • Integrated test box (to automatically check the transduceres during mounting)
  • Single software program for monitoring, processing and reporting (with extensive processing/graphics/reporting options)
  • Mounting tools
  • Combined tool for transducer transport/mounting and drilling jig
  • Transducer checking during mounting and monitoring
  • Test box generating artificial signals to calibrate the electronics of PDR, and check proper functioning of data transmission once installed on the test pile
  • For long range Wi-Fi (up to 200 m depending on circumstances) a USB antenna can be connected to the monitoring PC

 AllWave - Wave Equation Program

Allnamics has developed a suite of wave equations analysis programs called AllWave:
- AllWave-PDP – for impact hammer & vibratory hammer pile driving simulation (to perform driveability studies)
- AllWave-DLT – for signal matching of high strain dynamic test results (in combination with PDA and DLT)
- AllWave-SIT – for signal matching of low strain test results (as part of integrity testing)
- AllWave-RLT – for rapid load testing predictions (for StatRapid and Statnamic testing)

All these programs are based on the theory of the wave propagation through a one-dimensional elastic material. Based on this theory, a simple differential equation can be derived which can be solved numerically and analytically. Allnamics has opted for the analytical solution of the differential equation and made this solution suitable for computer implementation. The solution method for the differential equation is called the “method of characteristics”. The advantages of this approach are:

- the simulation of elastic problems is exact.
- the simulation of non-linear problem (pile-soil interaction) is very accurate
- the process time is decreased to an absolute minimum.
- the input of geo-technical data for the soil layers is facilitated in digitized form

 AllWave-PDP

AllWave-PDP is a dedicated program for onshore and offshore driveability studies for both impact and vibratory hammers. It is a Wave Equation Program based on the  Method of Characteristics.

Being capable of predicting pile behavior during driving is vital, because in almost all cases when a pile meets early refusal remedial (and very costly) actions have to be taken in order to drive the pile further into the ground.  These remedial actions may be:

  • to continue driving with the same hammer, risking that the hammer and the pile get damaged;
  • to continue driving with a heavier hammer, assuming the pile is strong enough to resist the higher stress levels;
  • (in case of a pipe pile) to remove the internal soil plug in the pile, even though this could result in a lower bearing capacity when the pile is driven to the final penetration depth.

In many cases this can be prevented when the experts do their "homework" properly, i.e. prepare an accurate pile driveability prediction.  Nowadays, the combination of data bases on pile driving and computer pile driving simulation is of such a quality that a reasonable prediction can be made.  For this purpose the pile driving simulation program AllWave-PDP can be used.  This program enables the modelling of hammer, cushion/anvil, pile, and soil resistance in a realistic way.  The correct data for all these parameters can be obtained from the database included in the program, which contains not only models for hammers and cushions, but also static and dynamic parameters of a variety of soils.

One of the major advantages of AllWave-PDP over other piledriving simulation packages is the incorporation of an advanced soil fatigue modelling feature in the algorithm, which will result in more accurate predictions.

At each defined pile penetration level a separate wave equation analysis is performed and  the soil model is updated with the soil  fatigue situation at that level. Without proper soil fatigue modelling it is almost impossible to predict the final set/blow count of a driven pile in a reliable way.

Brochure AllWave-PDP download:   AllWave-PDP Wave Equation Program for Driveability Studies (2413 downloads)

AllWave-DLT

Signal Matching Program.

AllWave-DLT is one of the options of the wave equation package AllWave. This application is used to determine the pile capacity and static load displacement behaviour (SLT) of a pile. The blow from a dynamic load test (DLT), measured with an Allnamics-PDADLT system (PDR) , is introduced on top of the wave equation pile model and signals are calculated on the pile top. A comparison is made between calculated signals and real measured dynamic load test signals.

Download brochure  AllWave-DLT Signal Matching Software - 2013 (1576 downloads)

AllWave has geotechnical engineering dedicated soil data input modules. Soil investigation results are transferred to static and dynamic soil model parameters. The soil investigation results are used as a boundary condition for the signal matching proces.

The static and dynamic soil model parameters are updated until a good match is obtained between calculated and measured signals. The load displacement behaviour is calculated from the static parameters of  the computer soil model.

The Dynamic Load Testing method is most suited for precast piles. For cast in situ piles Rapid Load Testing methods (e.g. Statnamic and StatRapid) with UPM analysis are advised, which yield consistent and user independent results.

Allnamics has more than 35 years of experience with the signal matching approach, worldwide, both onshore and offshore.