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The Pile Driving Analyzer (PDA) from Pile Dynamics is a very useful tool for estimating the geotechnical capacity and performance of driven and cast-in-place piles.
Read how Pile Integrity Tester (PIT) uses pulse echo and transient testing. PIT-Professional reporting software allows advanced modeling and analysis. PET - Pile Echo Tester - This app is now in full-support mode. Echo Tester) uses the Pulse-Echo method (PEM) for quick pile integrity testing (PIT) of large number of piles. PET - Pile Echo Tester is a free software application from the PIMS.
The test involves attaching accelerometer and strain transducers to the side of the test pile and impacting the top of the pile using a pile driving hammer or drop weight with sufficient energy. The response from the sensors on the pile is recorded by the PDA and analysed later in the office with CAPWAP (CAse Pile Wave Analysis Program).
PDA testing can provide estimated pile capacity (shaft and toe resistance separated), compression stresses induced at top and bottom, tension stresses induced along the shaft, energy transferred to the pile, distribution of resistance along the shaft, and pile integrity.
The Pile Integrity Tester (PIT) users the Sonic Echo or Pulse Echo method to conduct low strain pile integrity testing. PIT is a non-destructive testing method used on concrete piles to detect potential defects such as cracks, necking, soil inclusions and voids.
A wireless accelerometer is attached to the top of the prepared pile and impacted with a small hand-held hammer. The accelerometer monitors the impact and resulting reflections of the compression wave travelling through the pile. The results are evaluated in the field and later in the office using PIT-W software.
In some situations, the PIT can determine unknown lengths of piles. PIT does not require advance planning and it is an affordable option when the pile integrity testing is specified or pile integrity is in doubt.
Alternative pile integrity testing methods include Crosshole Sonic Logging (CSL) and Thermal Integrity Profiling (TIP).
Static pile tests are conducted to test a pile against compression, tension or lateral loads. Calibrated electronic load cells and displacement sensors are used with purposed built loading frames, reference beams and hydraulic rams.
The Sonic Echo-Impulse Response system (also known as Pile Integrity Testing, or PIT) is designed to determine the length and integrity of foundations when the top or part of the upper side of the foundation is accessible. This system and its associated methodology can be used on both new and existing foundations and is performed by impacting the foundation and recording echoes from a defect or the foundation bottom with a nearby receiver(s). This method works best for columnar type foundations such as piles and drilled shafts, but has also been used successfully on mat foundations, abutment walls, and similar structures. Sonic Echo/Impulse Response is applicable on concrete, wood, and round steel pipe foundations.
The Sonic Echo (SE) method is normally conducted in conjunction with the Impulse Response (IR) method together as the Sonic Echo/Impulse Response method. Olson Instruments sells the base model SE-1 system that exclusively uses the Sonic Echo methodology without the Impulse Response analysis. This system, along with its associated software, uses only the time domain information in the data for the interpretation of reflections. The IR option (SE/IR-1 Model) provides the user with the ability to transform data from time domain into frequency domain. The software then automatically calculates the transfer and coherence functions, which may be useful for data quality analysis as well as providing further information about reflections within the structure.
Olson offers Sonic Echo systems for use with three different platforms as shown in the chart below. Olson's SE and SE/IR Models are sold as add-on systems for the NDE 360 and Freedom Data PC platforms while the Foundation TestGauge (FTG) is designed to be used with a Windows Device supplied by the user.The SE/IR-1 + PS-1 Model combines Sonic Echo/Impulse Response (SE/IR) with Parallel Seismic (PS) for complete foundation testing at a reduced price as the systems share many common components.
|Freedom Data PC or NDE 360 Required, |
|Freedom Data PC|
|FTG requires Windows Device|
(performs SE only)