A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Buried and Forgotten—Challenges from the Past
A seemingly benign cave-in between two residential buildings appeared to be a simple emergency sewer repair. The fifty year old 12-inch cast iron gravity sanitary sewer main carried half the flows from the service area to the pumping station. Little did we expect that this would turn into a major repair involving multiple engineering disciplines. The utility engineer investigated the cave-in through CCTV and review of the as-built plans. It was discovered that the area had unstable soil conditions and the pipe was constructed on a wood pile system ten feet below grade. The pipe required emergency repairs. During the point repair the pile system was confirmed along with poor soil conditions. A geotechnical engineer was engaged to examine the conditions of the existing piles and soils. The piles appeared to be in good condition, while the cross members that supported the pipe had failed. Tests were performed on the existing piles and were found to be structurally sound. The engineer recommended that the pipe support system be rehabilitated and supplemented with a 2 to 5 foot stone base. A rehabilitation design was created by the structural engineer for the pile system. The project incorporated the complete replacement of 315 linear feet 12-inch gravity sewer, rehabilitation of the pile support system and restoration of the site. The lessons learned included; that the cooperation and integration of multiple engineering disciplines was essential to the success of the project, and the utilization of innovative materials to rehabilitate the pile system provided a sound foundation for additional service life.
Buried and Forgotten—Challenges from the Past
A seemingly benign cave-in between two residential buildings appeared to be a simple emergency sewer repair. The fifty year old 12-inch cast iron gravity sanitary sewer main carried half the flows from the service area to the pumping station. Little did we expect that this would turn into a major repair involving multiple engineering disciplines. The utility engineer investigated the cave-in through CCTV and review of the as-built plans. It was discovered that the area had unstable soil conditions and the pipe was constructed on a wood pile system ten feet below grade. The pipe required emergency repairs. During the point repair the pile system was confirmed along with poor soil conditions. A geotechnical engineer was engaged to examine the conditions of the existing piles and soils. The piles appeared to be in good condition, while the cross members that supported the pipe had failed. Tests were performed on the existing piles and were found to be structurally sound. The engineer recommended that the pipe support system be rehabilitated and supplemented with a 2 to 5 foot stone base. A rehabilitation design was created by the structural engineer for the pile system. The project incorporated the complete replacement of 315 linear feet 12-inch gravity sewer, rehabilitation of the pile support system and restoration of the site. The lessons learned included; that the cooperation and integration of multiple engineering disciplines was essential to the success of the project, and the utilization of innovative materials to rehabilitate the pile system provided a sound foundation for additional service life.
Buried and Forgotten—Challenges from the Past
Johnson, C. A. (author) / Brown, F. (author)
Pipelines 2016 ; 2016 ; Kansas City, Missouri
Pipelines 2016 ; 1464-1472
2016-07-11
Conference paper
Electronic Resource
English
The Buried Past: An Archaeological History of Philadelphia
| Online Contents | 1995
| British Library Online Contents | 2004
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