Vibratory Driving Analysis (VDA)

Allnamics has developed the VDA monitoring set to monitor the process of pile installation by means of a vibratory hammer. As PDA is monitoring during impact driving, the VDA is its equivalent for vibratory driving. The system monitors installation records (i.e. penetration speed), hammer performance (i.e. energy, amplitude, and frequency), pile data (i.e. pile stresses), and soil resistance during driving.

For onshore and (especially) offshore conditions.

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 AllWave for Signal Matching
Possibility to export signals for Dynamic Load Testing, fatigue analysis, and way more
Sleep function to delay the start of monitoring with hours, days, or weeks
Optimised for use by civil, geotechnical, and foundations engineers
Extensive reporting options in either PDF or MS Word format
Fully compliant with international standards (ASTM, EuroCode, etc.)
Supported by the Allnamics team with more than 50 years of experience

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

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

Monitoring a giant monopile: the Vibratory Driving Analysis (VDA) — Expanding sizes of special structures (here a monopile with a diameter of 20 (!) meters, bring engineers out their experience and comfort zone: Monitoring is here required to control the process

Vibratory Driving Analyses (VDA vs PDA)

For VDA monitoring the two combined VDA sensors are mounted opposite each other on the pile, monopile or sheet wall. Connected to the PDR data acquisition unit, this unit stores and also sends monitoring signals and results to the monitoring PC wirelessly via powerful WiFi.

Vibratory Driving Analysis 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.

The total process of pile installation during driving can be monitored with the Allnamics-VDA set or PDA set. PDA stands for pile driving analysis or pile driving monitoring and is used for the driving process with impact hammers. VDA, the vibratory driving analysis, is for monitoring the installation process by means of a vibratory hammer. In both applications, the parameters of the hammer, pile, and soil can be monitored to optimize the pile driving process and hammer efficiency, the condition of the pile, to avoid problems i.e. by limiting 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.

Wireless PDR for Dynamic Load Testing

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.

PDR FOR wireless 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 (VDA). The PDR communicates wireless with the monitoring laptop by WiFi. See for more details <here>.

THE VDA MONITORING SENSORS

Each measuring system includes two combined sensors for measuring strain and acceleration. The sensors are delivered with a multipurpose template. This template is used for the 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 driven into the soil, using an impact hammer that can drive piles underwater. As a result, special VDA-sensors for application underwater have been developed, able to resist the high pressure of many (hundreds of) meters of water depth.

ALLWAVE Vibro AMplitude MATCHING (VAM)

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 process of Signal Matching on VDA Signals, the soil model is adjusted until a good match between the calculated and measured amplitudes of the signals is obtained.

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.

SPECIFICATIONS AND CODES

Allnamics equipment for Vibratory and Pile Driving Analysis (VDA & PDA) are fully compliant 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 VDA, please contact us at info@allnamics.com

For driveability studies for vibratory driving, see AllWave-VDP

Vibratory Driving Analysis ON YOUTUBE

See also our YouTube Allnamics channel and YouKu Allnamics channel

Allnamics VDA - Vibratory Driving Analysis on 4 m Monopile

Product informatie (PDF)

Gerelateerde projecten