PITTSBURGH 412.257.1800

CLEVELAND 216.579.1855

ST. LOUIS 618.277.7510

I-72 Sangamon River Bridge, Springfield, Illinois

During a routine bridge inspection, it was discovered that the 6-span, 5 pier, bridge over the Sangamon River on I-72 was experiencing differential settlement, compromising the integrity of the bridge and the safety of motorists. Piers 3, 4, and 5 were all experiencing differential settlement with pier 3 experiencing the most, at approximately -3.5 cm of movement. Upon further investigation, it was determined that the differential settlement was caused by mine subsidence due to 2 abandoned coal mines beneath the bridge, approximately 200 feet below ground surface.

Howard Concrete Pumping was contracted to perform the first phase in mine stabilization by drilling and grouting beneath pier 3 under an emergency contract let by the Illinois Department of Natural Resources (IDNR). We drilled 60 grout injection boreholes beneath and adjacent to pier 3, and 2,839 cubic yards of grout were injected through the boreholes into the mine below. Survey of the structure indicated that movement of pier 3 had ceased upon placement of the grout.

Soon after completion of Phase I, we were again contracted for Phase II, which involved stabilization of the abandoned mine below piers 4 and 5. We drilled 48 grout injection boreholes, and 4,463 cubic yards of grout were injected through the boreholes into the mine below. As with pier 3, movement of piers 4 and 5 ceased upon placement of the grout.

We overcame numerous challenges during the project to save the bridge, including: extreme cold weather, flooding of the Sangamon River, and drilling the grout injection boreholes through the alluvial deposits adjacent to the river. Our vast experience in mine stabilization along with a superior equipment fleet, and partnering with the agencies involved, allowed this project to be a success and keep the bridge open and safe for the motoring public.

Pittsburgh Office Location

Howard Concrete Pumping Pittsburgh PA Office

701 Millers Run Road
Cuddy, PA 15031
412.257.1800

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Cleveland Office Location

Howard Concrete Pumping Cleveland Ohio Office

18801 South Miles Rd.
Warrensville Heights, Ohio 44128
216.579.1855

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Illinois Office Location

Howard Concrete Pumping Illinois Office

124 Tower Plaza
Belleville, IL 62220
618.277.7510

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