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CASE STUDY DuPont

PROJECT NAME OR TYPE:

Removal of a pedestrian bridge

PROBLEM OR TASK:

Remove a pedestrian bridge that connected two buildings approximately 100 feet in the air over an active road. The road needed to stay open during the week so the work had to be completed after 6PM on Friday and finished before 6AM on Sunday. The basements for the connected buildings extended to the curb line outside of the buildings which limited the equipment size that could be used for fear of damaging the basement walls

OUR SOLUTION OR DESCRIPTION OF WHAT WE DID:

MDavis split the project into two weekends of work. On the first weekend, we stripped the bridge which included removing all of the siding, interior walls and the concrete flooring. This allowed us to remove the structural steel frame on the second weekend using two smaller cranes because of the now reduced weight of the bridge. The smaller cranes were needed to keep the pressure bulb, created by the cranes’ out riggers, from damaging the basement walls.

UNIQUE CHARACTERISTICS OF OUR WORK:

Sizing the equipment so that it would be large enough to lower the bridge but small enough to fit on the street and not damage any of the below ground facilities was a challenging task. Another critical issue was estimating the weight of the structural steel frame so that the cranes could be pre-loaded to hold the frame once the final cuts were made. Too much pull and the frame would jump when it was cut loose and too little pull and the frame would fall.

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