718 - Drilled Shafts

718 Drilled Shafts 2012 STANDARD SPECIFICATIONS FOR CONSTRUCTION - SECTION 718

GENERAL

Drilled shaft foundations are also referred to caissons, drilled piers, or bored piles, and consist of circular shafts of varying diameter, drilled to a design depth, reinforced with a steel rebar cage, and filled with concrete. Drilled shaft foundations can support large loads, and are used when driving steel piles is not feasible, or surrounding structures or utilities are too sensitive to survive the vibrations from steel foundation pile driving operations. Like steel foundation piles, loads from the superstructure transfer into the drilled shafts, which transfer loads to soil layers through side friction, end bearing, or a combination of the two. Drilled shafts are used for bridge foundations, and other ancillary structure foundations such as sign cantilevers and trusses, and signal strain poles.

Drilled shafts can be constructed in the dry, or in the wet, and can also include a steel casing.

[top of page]

---

MATERIALS

-Reserved-

[top of page]

---

CONSTRUCTION

-Reserved-

[top of page]

---

MEASUREMENT AND PAYMENT

-Reserved-

[top of page]

---