Pharmaceutical, Sparks, MD
Challenge:
Customer had a super flat floor that could not be lifted. Due to voids present under the concrete and the weight of Raymond High-reach forklift driving above, the concrete would give and flex. This instability in the floor would cause forklifts to tilt and shutoff. Also, underneath the slab in this area, was a high concentration of rebar, electric lines, electric conduit, and water lines. Care had to be taken with any drilling Hi-Tech personnel did so as not to hit these utility lines. This 240 ft. long floor needed to be stabilized and returned to use within two days.
Solution:
The first step was to hire Enviroscan, Inc. from Lancaster, PA , which had excellent knowledge and equipment for ground penetrating radar, so we could locate all underground rebar, electric lines, and water lines. Enviroscan, Inc. marked out all locations of utilities and rebar allowing Hi-Tech to commence drilling 5/8”access holes for their expanding polymer. Hi-Tech did not hit one utility or rebar thanks to the professionalism and experience of Enviroscan, Inc. Once drilling was completed, we then started injecting the expanding structural polymer to fill voids. By monitoring the process with laser readers, we were able to ensure that the existing main slab tolerance was maintained throughout
Results:
Once stabilized, all holes were patched, and the Raymond High-reach forklift was brought in half an hour after injection and patching to test consistency of stabilization. Under load the Raymond forklift passed over the entire aisle way without shutting off due to tilt or instability. Once this was confirmed we clean off all utility markings with an automatic scrubber. The aisle way was returned to use immediately following project completion. Throughout the entire process no underpinning or excavation was necessary.