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Title:

Prestressed Concrete Pile Installation - Utilizing Jetting and Pressure Grouting

Accession Number:

01128906

Record Type:

Monograph

Availability:

Florida Department of Transportation

605 Suwannee Street
Tallahassee, FL 32399-0450 USA

Abstract:

With increased urbanization, selection of deep foundations (bridges, signage, walls, etc.) is being controlled by the minimization of impact or disturbance, as well as quality assurance and control (e.g., proof testing, etc.). Deep foundations have thus migrated from driven piles to drilled shafts to tip grouted drilled shafts. Recently, a number of European and Asian designers/contractors have begun grouting driven precast concrete piles along their sides and at their tips. The use of these in Florida soils as well as their design is the focus of this research. Testing of the proposed jet grouted piles revealed problems with both the grout delivery system, as well as the grout mix design. In addition, full scale tests showed greater radial than vertical grout movement as well as poor bonding between the grout and precast member. Subsequently, improvements to the grout delivery system, mix design and incorporation of a semi-rigid high tensile strength membrane were introduced. Testing on jet grouted piles from 8 to 20 feet in length revealed both excellent grout side grout coverage, as well as unit side resistance under both axial and torsional loading. Using cavity expansion theory and/or in situ Pressuremeter testing, both the grout pressures and skin and tip resistances may be estimated. The new pile has a number of attractive features: 1) known structural cross-section; 2) minimal installation disturbance; and 3) proof testing and higher LRFD theta factors for design.

Contract Numbers:

BD-545 #31

Language:

English

Corporate Authors:

University of Florida, Gainesville

Department of Civil and Coastal Engineering, P.O. Box 116580
Gainesville, FL 32611-6580 USA

Florida Department of Transportation

605 Suwannee Street
Tallahassee, FL 32399-0450 USA

Authors:

McVay, Michael
Bloomquist, David
Forbes, Heath
Johnson, James

Pagination:

158p

Publication Date:

2009-3

Edition:

Final Report

Period Covered:

9/22/04-2/28/09

Media Type:

Print

Features:

Figures; References; Tables

Subject Areas:

Construction; Highways; I53: Construction of Bridges and Retaining Walls

Files:

TRIS, STATEDOT

Created Date:

May 8 2009 2:35PM