Location
Chicago, Illinois
Date
02 May 2013, 10:10 am - 10:30 am
Abstract
The paper describes the design and construction history of 67-story and 45-story residential towers in Chicago which were constructed on straight-shaft caissons supported on the surface of dolomite bedrock at a design bearing pressure of 90 tons per square foot (tsf). The use of the 90 tsf bearing pressure was a first in Chicago and a strong departure from the Chicago code method of requiring rock sockets at least one to six feet deep along with permanent steel casing. The caissons were constructed by using polymer drilling slurry and tremie concrete pouring procedures. This paper presents a brief history and evolution of the Chicago caisson to provide context to the project design and describes the load testing program used to prove the design and performance of the foundations. The non-destructive testing and coring programs used to check the concrete quality identified defects in several shafts which required remediation. The methods used to remediate the defective shafts included pressure grouting, shaft replacement, and large-strain dynamic load testing.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
7th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2013 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Kiefer, Tony A., "Slurry Caisson Problems and Correction in Chicago" (2013). International Conference on Case Histories in Geotechnical Engineering. 1.
https://scholarsmine.mst.edu/icchge/7icchge/session10/1
Slurry Caisson Problems and Correction in Chicago
Chicago, Illinois
The paper describes the design and construction history of 67-story and 45-story residential towers in Chicago which were constructed on straight-shaft caissons supported on the surface of dolomite bedrock at a design bearing pressure of 90 tons per square foot (tsf). The use of the 90 tsf bearing pressure was a first in Chicago and a strong departure from the Chicago code method of requiring rock sockets at least one to six feet deep along with permanent steel casing. The caissons were constructed by using polymer drilling slurry and tremie concrete pouring procedures. This paper presents a brief history and evolution of the Chicago caisson to provide context to the project design and describes the load testing program used to prove the design and performance of the foundations. The non-destructive testing and coring programs used to check the concrete quality identified defects in several shafts which required remediation. The methods used to remediate the defective shafts included pressure grouting, shaft replacement, and large-strain dynamic load testing.
