Enhancing Specifications for Cast-In-Place Concrete Piling in Collaboration between ADSC WCC and Caltrans
Explore the collaboration between ADSC WCC and Caltrans to improve Section 49-3 specifications for cast-in-place concrete piling. Discover key aspects such as the importance of CIDH piles, preconstruction meetings, mitigation plans, and drilled hole amendments. Stay updated on the evolving standards and procedures in the construction industry.
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WEST COAST CHAPTER IMPORTANT ITEMS OF SECTION 49-3: CAST-IN-PLACE CONCRETE PILING (And How the ADSC WCC and Caltrans has worked together to improve these Specifications!) Ray Fassett ADSC WCC PAST PRESIDENT Condon-Johnson & Assoc. Inc
WEST COAST CHAPTER For Your Information: 49-3.02 CAST-IN-DRILLED-HOLE (CIDH) PILE Caltrans is the only DOT that uses this description for a Drilled Shaft.
WEST COAST CHAPTER Special Provisions will update the 2010 Standards. Amendments to the Standards also exist. Remember to stay current! These specifications describe how the work is to be built. They still require clarifications prior to and during construction.
WEST COAST CHAPTER 49-3.02A(3)(b) Pile Installation Plan Most Important Submittal for CIDH work. Defines the Installation Process. Should cover all aspects of the work. Should be reviewed based on the required content. But is it necessary to cover things that don t apply? List is redundant, should it be covered multiple times? Is it easier to follow a Submittal that follows the list?
WEST COAST CHAPTER 49-3.02A(4)(b) Preconstruction Meeting Needs to be held after the Pile Installation Plan has been submitted and reviewed. Provides an opportunity for the Inspection Staff to discuss with the contractor how the work will be performed. Should include most people listed in BCM 130- 20.0
WEST COAST CHAPTER 49-3.02A(4)(b) Preconstruction Meeting (Cont.) Should discuss shaft entry procedures. Should discuss tie-off procedures and access to the shaft for Inspection Personnel. Will Caltrans log the shaft?
WEST COAST CHAPTER 49-3.02A(3)(c)(g) Mitigation Plan ADSC Standard Mitigation Plan Came out of ADSC WCC s and Caltrans Substructure Committee as a way to mitigate the time it takes to review a repair procedure. Over 90% of all Anomalies can be mitigated with this Plan. Began in 2005, published in 2007.
WEST COAST CHAPTER 49-3.02C(2) Drilled Hole Amended 7-19-13 to provide a horizontal tolerance. This is a product of the Caltrans ADSC WCC Substructure Committee. Allows the larger of 1/24 of pile diameter or 3 in a pile group. Provides tolerance in a Type II pile by way of minimum clearances between column and CIDH reinforcing. For Type I pile, needs to be accurately placed or need to use the tolerance in the concrete cover.
WEST COAST CHAPTER 49-3.02C(4) Reinforcement Amended 1-20-12 to require minimum of 3 concrete cover. This is a product of the Caltrans ADSC WCC Substructure Committee. Is a compromise to allow for the larger cover to be used to align the CIDH reinforcing cage into the correct location.
WEST COAST CHAPTER SIDE NOTE ON REINFORCEMENT: not everything that pertains to this work is in Sect. 49. California Amendments to AASHTO LRFD: Rebar Spacing 52-1.03D Placing Section entitled For column and pile bar reinforcing cages measuring 4 feet in diameter and larger These Tie requirements were a product of an ADSC WCC / AGC / CRSI and Caltrans meeting held back in 2009 to discuss the safe handling of rebar cages. Later confirmed by the UNR Research on Column Stability
WEST COAST CHAPTER 49-3.02B(8) Spacers Amended 1-20-12 to allow the use of plastic spacers. Product of a request from the ADSC WCC
WEST COAST CHAPTER 49-3.02A(4)(d) Acceptance Testing (i) General: Is water allowed in the tubes during testing? (ii) Vertical Inspection Tubes: Standardized by the Substructure Committee. Requires reinforcing to be installed non-uniform but still symmetrical (provided equal number of tubes to the number of vertical bars) to provide proper clearances to pvc. (iv) Rejected Piles, Anomaly Deduction ADSC WCC and Caltrans partnered on the new deduction table.
WEST COAST CHAPTER 49-3.02B(4) Permanent Steel Casing 49-3.02C(5) Permanent Steel Casing Installation 49-3.02C(6) Construction Joint When is CMP Casing Acceptable? When used in conjunction with a Construction Joint? Why are construction Joints for Type II piles mandatory?
WEST COAST CHAPTER 49-3.02B(4) Permanent Steel Casing 49-3.02C(5) Permanent Steel Casing Installation 49-3.02C(6) Construction Joint (Cont.) 49-3.02B(5) Grout Is lean concrete an acceptable backfill around permanent casing? Amended 7-19-13 to allow neat cement grout as backfill. this works for a small annulus around casing.
WEST COAST CHAPTER 49-3.02A(2) Definitions 1-20-12 Amendment Defines a dry hole Product of a request from the ADSC WCC
WEST COAST CHAPTER 49-3.02B(6) Slurry Know the difference between recirculated and replaced and why one might be better than the other. Caltrans requires the use of slurry when you cannot dewater a shaft. When is it ok to use water as a slurry? Full Length Casing? Non-Slacking Rock? What will the Specifications allow?
WEST COAST CHAPTER QUESTIONS? COMMENTS?
