With a pile driving load test, a reaction frame is attached to the reaction piles and spans over the top of the test pile. As the load is applied by a hydraulic jack, the reaction beam transfers the load to the test pile, putting it in compression and putting the reaction piles in tension to test the driven piles’ capabilities.
The most common use of pile driving is in the creation of deep foundations. Unlike the shallow foundations that rest on the surface, deep foundations are used in situations where more support is needed. These could include large design loads or poor soil at shallow depths.
Driven piles are an excellent option in negative environments. Larger diameter piles work well in earthquake-pron e areas; piles can be coated with protectants in corrosive environments; and non-displacemen t piles can be used in areas where impact on nearby structures must be considered.
Hammer driving isn’t always effective in sandy or gravelly soils, which is usually when we switch to vibratory driving. This kind of driving vibrates the pile enough to break up the friction between the soil pieces so the pile can be pushed into the ground.
For marine or near shore applications, driven piles are a superior option. There is no waiting for concrete to cure, and special casings do not need to be installed – thereby reducing costs associated with time and extra materials.
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