Drilled shaft footings vs Sonotube footings
Sonotube footings and drilled shaft footings have some differences in their construction and
behavior. Let's explore them:
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2.
Sonotube Footings:
○ Sonotubes are cylindrical cardboard tubes or plastic conical-based forms used
to create footings for structures like decks, sheds, and home additions.
○ They are typically filled with concrete and placed in holes dug into the
ground.
○ The friction between the soil and the sonotube depends on factors like the
shape of the hole, concrete curing, and debris near the post.
○ Common pitfalls associated with sonotubes include uneven curing, angled
holes, and debris impinging on the concrete post [1].
○ A larger diameter footing is poured to spread the load over a greater area,
especially when the underlying ground can't support the same load over the
same surface area [3].
○ Sonotubes are cost-effective but require proper planning and supervision to
avoid potential issues.
Drilled Shaft Footings (Piers):
○ Drilled shaft footings, also known as piers, are deep cylindrical holes drilled
into the ground.
○ They are typically filled with concrete or reinforced with steel.
○ The friction between the soil and the drilled shaft depends on the shaft's
surface area and the soil conditions.
○ Drilled shafts provide better load-bearing capacity and stability compared to
sonotubes.
○ They are commonly used for larger structures and in situations where soil
conditions are challenging.
○ Proper engineering design and construction are essential for drilled shaft
footings.
In summary, while both sonotube footings and drilled shaft footings serve as foundations,
their behavior and load-bearing capacity differ. Drilled shaft footings are generally more
reliable for larger structures and challenging soil conditions, whereas sonotubes are costeffective but require careful installation and supervision [2]. Always consult with a structural
engineer or professional to determine the best footing type for your specific project. 🏗️�
Source: Conversation with Copilot, 2024-06-05
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3.
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4.
5.
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