Location
Chicago, Illinois
Date
02 May 2013, 4:00 pm - 6:00 pm
Abstract
Underpinning of a private residence using square-shaft helical Screw-Piles is described. A two story wood frame single-family residence constructed in 1996 in a small subdivision started to experience differential settlement not long after construction. The settlement continued for several years, leading to excessive cracking in the basement walls and floor, severe misalignment of doors and windows and cracking of interior walls. It was discovered that the area of the housing development had previously been used as a commercial sand and gravel pit which had subsequently been used as a local dumping area for miscellaneous refuse and which had then been covered by a layer of sand and gravel. In order to stop additional movement, a series of square-shaft helical Screw-Piles was installed around the perimeter of the structure extending through the fill to the underlying dense sand and gravel. Foundation brackets were attached to the existing concrete footings for transferring load to the Screw-Piles. The site conditions are described and the results of the test borings are presented to show the composition and variability of the underlying materials with focus on the fill. A description of the underpinning work is presented to illustrate successful use of Screw-Piles for underpinning lightly loaded structures.
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
Lutenegger, Alan J., "Underpinning a Residential Structure on Uncontrolled Fill With Helical Screw-Piles" (2013). International Conference on Case Histories in Geotechnical Engineering. 36.
https://scholarsmine.mst.edu/icchge/7icchge/session03/36
Underpinning a Residential Structure on Uncontrolled Fill With Helical Screw-Piles
Chicago, Illinois
Underpinning of a private residence using square-shaft helical Screw-Piles is described. A two story wood frame single-family residence constructed in 1996 in a small subdivision started to experience differential settlement not long after construction. The settlement continued for several years, leading to excessive cracking in the basement walls and floor, severe misalignment of doors and windows and cracking of interior walls. It was discovered that the area of the housing development had previously been used as a commercial sand and gravel pit which had subsequently been used as a local dumping area for miscellaneous refuse and which had then been covered by a layer of sand and gravel. In order to stop additional movement, a series of square-shaft helical Screw-Piles was installed around the perimeter of the structure extending through the fill to the underlying dense sand and gravel. Foundation brackets were attached to the existing concrete footings for transferring load to the Screw-Piles. The site conditions are described and the results of the test borings are presented to show the composition and variability of the underlying materials with focus on the fill. A description of the underpinning work is presented to illustrate successful use of Screw-Piles for underpinning lightly loaded structures.
