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Build Tech Asia 2017

 

Come and visit us at our booth J10 from 24-26 October 2017 in Singapore.
 
We will be showing new equipment we developed this year.
 

 

More information on http://www.buildtechasia.com
 

Vibration monitoring at a historic farmhouse

 

While concrete sheetpiles were installed with a vibro hammer Allnamics monitored the vibrations at a nearby historic farmhouse in Hoofddorp, near Amsterdam Schiphol Airport.

 

Allnamics was asked to monitor and subsequently analyse the vibrations at this building. The conclusion was that while driving of the concrete sheetpiles did cause some vibrations, the planes flying overhead and the renovation work to the farmhouse itself contributed as well to the vibration levels.

 

More information about vibration monitoring can be obtained at our office in Heemskerk.

Photo 1: Historic farmhouse

 

Photo 2: Vibrating in concrete sheet piles

 


More information about vibration monitoring ?

See our service : Vibration Monitoring.


 

Call for Papers Deadline – 10th International Symposium on Stress Wave Theory and Testing Methods for Deep Foundations

 

ASTM Committee D18 on Soil and Rock is sponsoring a Deep Foundations Symposium on June 27-29, 2018, San Diego, CA.  The deadline for abstract submission is next Monday.  This symposium encompasses all forms of deep foundation testing as indicated in the list of topical areas shown below.  To participate in the symposium, authors may submit a 250-300 word preliminary abstract online at http://www.astm.org/D18CFP_6_2018 no later than May 1, 2017.  

 

Call for Papers

We expect a diverse and international group of some 200 researchers, practitioners and academicians from more than 40 countries will gather to share experiences and findings. In addition to some 5 - 7 keynote lectures, papers will be presented dealing with 14 different conference themes applied to deep foundations:

  1. High strain dynamic testing
    2. Low strain integrity testing
    3. Rapid load testing
    4. Axial compression, tension, and bidirectional load tests
    5. Lateral testing
    6. Wave mechanics applications
    7. Soil-structure interaction for dynamic and static testing
    8. Testing and analysis of piles installed by vibratory methods
    9. Vibration monitoring due to dynamic effects - theory and measurements
    10. Simulation of pile penetration during installation
    11. Quality assurance testing for driven and drilled deep foundations
    12. Static resistance to driving and correlation of dynamic to static test results
    13. Design codes and test standards for testing of deep foundations
    14. Case studies of driven and drilled deep foundation testing

You can find additional information at http://www.astm.org/D18CFP_6_2018

For technical information please contact the symposium co-chairs:
Paul Bullock, SBE, Gainesville, FL, Email: pbullock@morrisshea.com, Tel: 352.215.9372

Gerald Verbeek, Verbeek Management Services, Tyler TX, USA, email: gverbeek@verbeekservices.com, Tel: 903.939.1168

David Tara, Thurber Engineering Ltd., Vancouver, BC, Canada, Email: dtara@thurber.ca, Tel: 604.684.4384

Sam Paikowsky, MA Lowell UN, New Center, MA, Email: sam@geodynamica.com, Tel: 978.934.2277

PDR-system used for special bridge project in Cartagena, Colombia

 

For the highway from Cartagena to Barranquila, Colombia, the approx. 6 km long bridge “Viaducto Gran Manglar” is built just north of Cartagena through a shallow lagoon with mangroves.

 

Mangroves are protected vegetation and therefore a construction method with minimal environmental impact was required. The contract was awarded to the Italian contractor Rizzani de Eccher who proposed to build the bridge from a launching gantry, using precast concrete elements.

 

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This very special construction method – developed by Canadian piling & equipment company Berminghammer - has a minimal impact on the surroundings, because the footprint of the construction work is the same as for the bridge itself: the gantry rests on the front end of the already completed part of the bridge and cantilevers to the location of the next pier. At the front of the gantry the piles for the next pier are installed, while at the back the main girders of the bridge deck are installed. These girders (just as all other construction materials) are transported over the already completed part of the bridge instead of through the lagoon, further reducing the environmental impact.

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Picture 3

Essential for this construction method is the verification of the foundation piles’ bearing capacity for each of the 129 piers within hours after installation, because the piles will have to bear their maximum design load 72 hours after driving. For this reason Rizaani chose to purchase Allnamics PDR-systems and AllWave software, and have their staff trained on site by Allnamics. This enabled Rizzani to perform PDA and subsequent signal matching themselves, with Allnamcis support (both on site & remote). Rizzani also contracted Allnamics to perform the dynamic monitoring of the test piles and the development and implementation of the pile driving and acceptance criteria.

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Picture 4

The construction method with the launching gantry allows the entire bridge to be built with precast pre-stressed concrete elements. For production of these elements – piles, pier caps and bridge girders – a complete precast yard has been built next to the northern abutment of the bridge. All elements are then transported to the rear of the gantry, using the already constructed part of the bridge.

 

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The launching gantry consists of 2 parallel truss bridges, and  rests on 2 main support beams that are placed on already installed piers.  From there the gantry cantilevers approx. 50 m, just past the loacation of the next pier.  Running over the top of the gantry are 2 cranes and at the front there is a leader system, equipped with a Berminghammer B6505-HD diesel hammer.

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Picture 7

The hollow concrete piles with a diameter of 1,0 m and a length of up to 55 m are driven in 2 sections that are jointed together with a custom designed mechanical splice . The cranes move the pile sections from the rear to the front of the gantry where it is placed into the leader. Next the leader  is erected vertically, after which the pile section is driven. Once the pile section is installed the leader is lowered back to the horizontal position sothe next pile section can be accepted.

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Picture 8

 

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After all 6 piles for the pier have been installed, they are cut off and a precast concrete cap is mounted over the pile heads. Once a temporary support is placed between this pile cap and the gantry, the front main support can be moved to this new pile cap and the rear main support is also moved up one pier. Then when both main supports are in their new position, the whole gantry is moved one span forward (approx. 37 m), with the leader ending up just past the location of the next pier to be constructed. But before the piles for that pier are driven , the girders for the bridge deck are mounted up to the just finished pier.

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Picture 12

With the launching gantry working at its normal pace, this installation cycle takes 3 days. For that reason the piles will get their maximum design load after 72 hours, when the gantry with leader cantilevers just passed the freshly installed pier cap. In each cycle, the pile bearing capacity needs to be verified in time for that.

 

Rizzani started piling at the north end of the bridge in August 2016 and will soon start with a second gantry at the south end.

 

For dynamic pile monitoring on two fronts Rizzani has purchased a second PDR-system.

 

 

Video of Berminghammer.

 

PDA monitoring for new Blue Piling hammer with 4000 ms samples

 

In spring of 2016 Allnamics was involved in monitoring the performance of a prototype of the new developed Blue Piling hammer. The performance tests were done in the Caland Canal in the Rotterdam Harbor, on a dedicated 140 m long test pile. This pile has sufficient resistance for pile driving hammers with a large energy output. In January 2013, at the same location, Allnamics was also involved in a PDA test for the acceptance of the (at that time) largest hydraulic hammer in the world, the Menck MHU 3500 S.

 

The Blue Piling hammer type is developed by Fistuca. Its working principle is explained on the website of Fistuca and is different from traditional hydraulic hammers or diesel hammers. One of the differences is the much longer load cycle duration of a single hammer blow.

 

The monitoring had some special requirements. First, next to the pile, also the housing of the hammer had to be monitored. Second, because full loading cycles had to be monitored, measurement samples of 4000 milliseconds had to be recorded. For the 140 m long test pile, this corresponds to approx. 70 stress wave periods (2*L/c). For standard PDA monitoring, international standards (ASTM, Eurocode) require a minimum sample duration of 6-8 stress wave periods, at a sample rate of at least 10 kHz. With the Allnamics PDR-system and Allnamics-PDADLT software, it was possible to monitor pile and hammer simultaneously for 4000 ms at 12.5 kHz sample rate during each blow. A new milestone!

 

Fistuca1

Photo 1 The Blue Hammer from Fistuca

 

Fistuca2

Photo 2 PDA Measurement with the PDR and sensors on the pile and hammer housing.

 

After instruction and training by Allnamics staff during the first day, engineers from Fistuca performed the PDA measurements themselves. For a period of 1 month the equipment was continuously exposed to humid and salty weather conditions, performing 100% of the time. This was another milestone in endurance of the equipment.

 

 

 

In case you are interested in more information on Pile Driving Analysis, Hammer monitoring or the PDR-system, please feel free to contact us.

 

Rapid Load Test code published by BSI

 

The BSI (British Standards Institution) has recently published the code for RLT in the UK (BS EN ISO 22477-10:2016). This code describes  Geotechnical investigation and testing; Testing of geotechnical structures; Testing of piles: Rapid Load Testing (RLT).

 

The StatRapid is fully compatible with this code and can be used to determine the static bearing capacity and load settlement behaviour of foundation piles.
 

The code can be purchased in the web shop of the BSI.

http://shop.bsigroup.com/en/ProductDetail/?pid=000000000030292492

 

For more information on StatRapid or Rapid Load Testing you can always contact Allnamics.

 

Do you want to read more about RLT on our website? Click here to search for RLT.

 

Best Wishes for 2017!

kerstkaart-2016

Research project DOT500 – Vibratory Driving Prediction and Analysis

 

On May 6th 2016 a monopile foundation has been vibratory driven into the ground for a full-scale test of a newly developed wind turbine.

 

Allnamics performed vibratory driving predictions in order to quantify the required vibro hammer (CV320). During actual installation Allnamics performed so-called VDA monitoring. The Vibratory Driving Analysis results in records of strain and acceleration in the pile. This offers the possibility to verify assumptions made for the prediction and consequently effectively close the double loop of the learning system.

 

The time-lapse presented below offers an impression of the monopile installation.

 

 
 
If you want more info about VDP or VDA?  Contact us!
 
More info about the CV320 or Cape Holland ?
 
More info about the DOT500 ?

 
 

New Axilog Vibration Monitoring Systems

 

On July 21, 2016 Allnamics received two axilogII systems from Leiderdorp Instruments BV. These state of the art vibration monitors will be deployed on those Allnamics projects where the vibration levels have to be recorded in accordance with BS, SBR or DIN guidelines and where online real time monitoring has to be performed.

 

AxilogII Systemen overdracht

Photo 1 : AxilogII systems received by Allnamics.

A big advantage of the axilogII vibration monitors is that tracking can be done from anywhere, whether from your or the client’s office, or even at home. Also, the axilogII can be programmed with multiple alarm levels, which allows  an early  warning in the event the actual thresholds are approached. In case of long-term monitoring it is also possible to automatically generate reports.

Photo 1 : The brand new AxilogII systems.

Photo 2 : The brand new AxilogII systems.

For more information about performing vibration measurements or if you want to take a vibration monitoring course you can of course contact us.
 
For more information about the axilogII vibration monitoring system we like to refer to the website of Leiderdorp Instruments http://axilog-uk.leiderdorpinstruments.nl/.

 

Referee StatRapid deployed for foundation new building Shipping- and Transport College

 

On March 21st 2016 a ‘Rapid Load Test’ has been performed according to CUR guideline 230 on a Terr-Econ pile in the Waalhaven, Rotterdam.

 

Immediate cause was the hypothesis, based on SIT results, of a crack being present just below the rebar. StatRapid par excellence is ideal to verify in such cases whether a crack will close when the pile is being loaded. If so, the pile is perfectly fit to be loaded in compression and can therefor be included in the foundation. The test results in a cyclic Load-Displacement diagram (analogues to a Static Load Test), from which the pile stiffness under work load can be extracted.

 

Foto 1 : Overview of the project location.

Foto 1 : Overview of the project location.

For more information on the StatRapid or Rapid Load Tests you can contact us.