PILE DRIVING SIMULATION FOR VIBRO HAMMERS

While pile driving simulations for piles driven with an impact hammer are standard practice, the same cannot be said for piles that are vibrated into the ground. And so more often than not we rely on experience to select a (over dimensioned / oversized) vibratory hammer for a particular application and then hope that we can drive the pile to the required depth. With Allnamic’s AllWave-VDP software you can actually be sure that this will be the case. The installation process is simulated and the predictions are as you would expect for any other pile driving simulation with impact hammers.

Big, bigger, biggest: VDA (vibratroy driving analysis) on huge monopiles for offshore wind farms (OWF)

Big, bigger, biggest: all offshore equipment increases over time:. an upending tool combined with a 920 kgm vibratory hammer. All to be used in simulation of the installation process of AllWave VDP

AllWave-VDP for HONG KONG-ZHUHAI-MACAU BRIDGE, CHINA

Driving of a 22 m diameter monopile worked out to be successful after
go-ahead by AllWave Pile Driving Simulation software from Allnamics (2011).

Over the years many projects has been both predicted and measured, resulting to improved soil models and improved methods for determination of the soil parameters from soil investigations. By frequently closing the learning loop (prediction, measuring, post-analysis), the predictions for the pile-hammer-soil behavior is nowadays reliable and accurate.

ALLWAVE-VDP

AllWave-VDP is a software program specifically for onshore and offshore driveability studies for pile driving with vibratory hammers.

AllWave-VDP software for driveability studies for vibratory driving

FEATURES

  • Wave equation software based on the Method of Characteristics
  • Product of more than 40 years continuous in-house development
  • Highly accurate vibratory hammer modeling
  • Extended library for vibratory hammers and steel (sheet)pile profiles
  • Various soil modeling options, incl. TNO and Smith
  • User friendly software interface to produce predictions
  • Standardized output options
  • Advanced options for research purposes
doorlinkknopjes
AllWave-PDP, drdivability for impact hammers as well for vibratory driving

VDA: PILE VIBRATORY DRIVING ANALYSIS

To monitor the pile installation process with a vibratory hammer, Allnamics has developed Vibratory Driving Analysis (VDA) equipment, the equivalent of Pile Driving Analysis equipment for impact driving. The equipment monitors installation records (penetration speed), hammer performance (power-output, amplitude and frequency), pile data (pile stresses) and soil resistance during driving.

Allnamics VDA allows not only control of the vibrodriving process, but the recorded data can also be used for subsequent Fatigue Analysis and Vibratory Amplitude Matching.

PDR monitoring set for PDA and DLT

KEY FEATURES

  • All necessary equipment (incl. a toolbox) is delivered in a single rugged case;
  • Both regular and underwater sensors (suitable to depth depths of 200 m)
  • Data acquisition system (the PDR):
    • 4 multipurpose sensor channels
    • 6 hours of operational battery
    • 200 m Wi-Fi range
    • Internal solid state memory backup
    • Suitable for other testing and monitoring applications
  • Allnamics-VDA monitoring software
  • Automatic reporting tool

WORKING PRINCIPLES

A set of combined acceleration &strain sensors and the PDR data acquisition system are bolted to the pile to allow for:

  • Live monitoring of the pile vibrodriving process
  • Real time sensor status control
  • Possibility to export the results for post-processing for Fatigue Analysis and Vibratory Amplitude Matching

TEST SETUP

Prior to the start of the monitoring holes are drilled, and the sensors and the PDR are mounted (note: the drilling machine is not included in the single rugged case). During monitoring the data can be transmitted to the field computer in various ways as shown in the figure below, or recorded in the PDR for downloading once the pile driving has been completed.

PDR configuration setup: Wireless, digital or analogue cabled or standalone

ALLNAMICS COMBINED SENSORS

Allnamics uses combined sensors to monitor accelerations and strains in a pile during installation. This simplifies the mounting process as only two bolts are required for each set of accelerometers and strain gauges. At the same time the sensors can be easily separated, allowing replacement of the sensor.

Allnamics combined sensors for above water: strain gauge and accelerometer combined
Combined sensors for acceleration and strain, stored safely in the template (above) for drilling and mounting.

FEATURES

  • Spacing tolerance to adjust to site conditions
  • Protective housing for transport and mounting
  • Sensors are equipped with USID, automatic ID/Calibration
  • Range strain sensor ± 1500 micro strain
  • Range piezoresistive accelerometer ± 500g
  • Dedicated sets for above water or underwater applications; underwater sensors are suitable for water depths up to 200 m.

Projects

Hong Kong Zhuhai Macau Bridge

AllWave-VDP for HONG KONG-ZHUHAI-MACAU BRIDGE, CHINA
AllWave-VDP for HONG KONG-ZHUHAI-MACAU BRIDGE, CHINA

Vibrohammers For Riffgat Project

Installing of offshore monopiles for an offshore wind farm by vibratory driving
Installing of offshore monopiles for an offshore wind farm by vibratory driving

Maasvlakte Research Project DOT500

VDA Vibratory Driving Analysis for both onshore and offshore (monopiles)
VDA Vibratory Driving Analysis for both onshore and offshore (monopiles)
Big, bigger, biggest: VDA (vibratroy driving analysis) on huge monopiles for offshore wind farms (OWF)
Big, bigger, biggest: VDA (vibratroy driving analysis) on huge monopiles for offshore wind farms (OWF)
allnamics-silhouette

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