A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Large Scale Substation Foundation Remediation
National Grid embarked on a large-scale substation upgrade of their 40+-year-old Bear Swamp Substation in 2014 involving over 150 new, isolated, drilled shaft (caisson) foundations. A value engineering proposal to re-use the existing foundations was considered, which could significantly reduce planned outages and capital costs. National Grid’s investigation of the existing pier foundations included historic plan review and field measurements, followed by non-invasive confirmation of below-grade pier geometry using low strain impact pile integrity testing. Under proposed design loads, the existing pier foundations were found to not meet the serviceability criteria for the project. Further evaluation of technically feasible options led to the consideration and eventual application of soil strengthening techniques to qualify the existing foundations for reuse. The project was completed at a construction cost savings of over $200,000. Additional soft costs saved by reducing the planned outages otherwise required to facilitate foundation replacement is estimated to double or triple the capital cost savings.
Large Scale Substation Foundation Remediation
National Grid embarked on a large-scale substation upgrade of their 40+-year-old Bear Swamp Substation in 2014 involving over 150 new, isolated, drilled shaft (caisson) foundations. A value engineering proposal to re-use the existing foundations was considered, which could significantly reduce planned outages and capital costs. National Grid’s investigation of the existing pier foundations included historic plan review and field measurements, followed by non-invasive confirmation of below-grade pier geometry using low strain impact pile integrity testing. Under proposed design loads, the existing pier foundations were found to not meet the serviceability criteria for the project. Further evaluation of technically feasible options led to the consideration and eventual application of soil strengthening techniques to qualify the existing foundations for reuse. The project was completed at a construction cost savings of over $200,000. Additional soft costs saved by reducing the planned outages otherwise required to facilitate foundation replacement is estimated to double or triple the capital cost savings.
Large Scale Substation Foundation Remediation
Costa, Richard E. (author) / McAllister, Gary (author) / Blaisdell, Andrew (author) / Tee, Baker W. (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 42-54
2019-03-21
Conference paper
Electronic Resource
English
Large Scale Substation Foundation Remediation
| British Library Conference Proceedings | 2019
Large Scale Substation Foundation Remediation
| TIBKAT | 2019