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RLT – Snelle Paaltesten

Rapid Load Testing
STATNAMIC

StatnamicTM is een innovatieve methode om het draagvermorgen van funderingspalen te testen conform ASTM D7383-10 en waarbij, conform CUR Richtlijn 230, het last-zakkingsgedrag van de palen wordt bepaald.
In vergelijking tot statisch proefbelasten, is 90 tot 95% minder gewicht nodig. Afhankelijk van het te testen draagvermogen is het met de Statnamic Rapid Load Test mogelijk om in 6 palen per dag te testen tegen veel lagere kosten.

Statnamische paaltesten zijn gebaseerd op het lanceren van een reactiemassa. Voor het opvangen van de reactiemassa maakt Statnamic gebruik van unieke technieken op basis van grind en hydraulische systemen. Profound heeft Statnamic samen met Berminghammer Foundation Solutions ontwikkeld.

Kenmerken

  • Statnamic is accurate, cost-effective and fast in determining the load bearing capacity of foundation piles. Statnamic signals foundation problems as soft toe and losses of friction.
  • Applicable for testing foundation piles, batter piles as well as for any lateral load testing.
  • The software calculates the load-deflection behaviour and the capacity of the foundation piles in combination with the soil. Results are summarized in a static load-displacement diagram.
  • Statnamic has been tested hundreds of times. Results appeared to be similar to those of static and dynamic load tests.
  • Statnamic devices are available with different maximum loads. Available device loads are 1, 2, 3, 4, 5, 8, 16, 20, 30 and 40 MN. The testing range is between 25% and 100% of the maximum device capacity.

  • Rapid Load Testing results
Key advantages

  • Statnamic overcomes technical, economical and practical difficulties of testing larger loads on deep foundations.
  • Prompt pile testing: only 5% of the weight needed for static load testing has to be loaded. Up to 6 piles can be tested per day.
  • The duration of a Statnamic loading is substantially longer than the load produced by Dynamic Load Testing. With Statnamic Load Testing, a controlled pre-determined load is applied directly to the pile whereby the longer duration results in no tension forces.
  • Loading is perfectly axial. The slow build up and release of the forces eliminate tensile stresses. The pile and soil will be compressed as a single unit and the static load-displacement behavior of the pile is obtainable.
  • Tests can be reproduced.

Operation

Rapid Load Testing with the Statnamic device is performed in 4 stages. To prepare the test, the cylinder with pressure chamber is connected to the pile head and the reaction mass (only 5-10% of the load tested) is placed over the piston. The test starts with igniting the solid fuel propellant inside the pressure chamber, generating high-pressure gases and accelerating the reaction mass. At this moment, the actual loading of the pile takes place.

The space caused by the upward movement of the reaction mass will be filled by gravel. The gravel catches the reaction mass and transfers the impact forces to the subsoil.

The applied force, displacement and acceleration are directly monitored. All signals are measured by the Profound data acquisition system whereby the mobilized capacity and static load displacement behavior are presented in a load-displacement diagram.

Data handling

The Profound data acquisition software presents a ‘Static Cyclic Load Displacement’ diagram based upon the Statnamic measurements. This diagram clearly represents the load-deflection behavior and the capacity of the foundation

Application

Statnamic is an alternative for Static Load Testing (SLT) of foundation piles. It is an accurate and cost-effective method of determining the load bearing capacity of foundation piles. During Rapid Load Testing the load duration is such that pile and soil behaviour are quasi static.