What are drilled shaft foundations?
Drilled shafts, also referred to as drilled piers, caissons or bored piles, are deep foundation solutions used to support structures with large axial and lateral loads by excavating cylindrical shafts into the ground and filling them with concrete.
What is the main difference between driven piles and drilled shafts?
Driven Piles: Foundation support typically using steel or precast concrete elements driven into soil with impact or vibratory methods. Drilled Shafts: Elements formed by creating a drilled hole into which structural steel and concrete is cast or placed.
What is a Micropile foundation?
Micropiles are high-performance, high-capacity drilled deep foundation elements typically between 5–12 inches in diameter that can extend to depths of 200 feet and achieve working loads of over 200 tons. Micropiles are comprised of high-strength steel casing, rebar and grout.
What drilled piles?
Bored piles are reinforced concrete elements that are executed in loco, in holes excavated using proper machinery. The execution method for this type of piles is simple and can be applied to the most types of soils, including in the presence of the water table.
What are the types of shallow foundation?
Shallow foundations, often called footings, are situated beneath the lowest part of the structure….The different types of shallow foundations are:
- Spread or Isolated Footing;
- Strip Foundation;
- Mat or Raft Foundation;
- Combined Foundation.
How much does a drilled pier cost?
There are many factors that go into the pricing including access, reinforcement design and the actual material that is being drilled into. However, average costs for drilled concrete piers on residential homes range from $4K-$7K per pier.
How deep are drilled shafts?
Drilled shafts for transportation structures are fairly commonly used to depths of up to 200 feet in the United States, but can extend to depths of as much as 300 feet or more. Drilled shafts also are referred to by other names, including drilled piers, caissons, cast-in-drilled-hole piles, and bored piles.
How many piles can be driven in a day?
To install the piles and foundations on a typical house extension can take 2-3 days. Drop weight rigs can install 5-10 piles a day and top drive rigs can install 10-20 piles a day (depends on depth driven).
Are driven piles Displacement piles?
Over the years, commercial construction engineers have created dozens of displacement pile styles, all of which are either pre-cast or cast-in-place, and most are either driven, drilled or screwed into the ground.
How much is a Micropile?
Micro Piles cost about $120 per linear foot, which is more expensive than the original H-piles. Changing the foundation system to Micro Piles will cost an additional $120,435.
What are pin piles?
Pin Piles are a smaller type of pile, that are typically 3″ or 4″ in diameter, and cater to projects that have a need for lighter loads and foundation repairs. The low cost of the piles also make them practical across a variety of projects, and so are appealing for many situations.