Underpinning for Florida Sinkhole Stabilization

Steel brackets are permanently mounted to the foundation and steel pins are advanced to an engineered prescribed depth into the limestone or rock. The structure’s foundation is then lifted and stabilized. Completing the stabilization process, the brackets are then welded to the pins and left in place. C&N underpins carry a “Limited Lifetime Transferable Warranty.”

Underpinning is an effective method of structure stabilization. Underpinning a structure transfers the load from less stable surface soils to a deeper more competent stratum.

This is accomplished through the installation of steel underpins which are hydraulically inserted on to a competent base.

C&N Foundation Technologies has the ability to either pre-drill or hydraulically advance each pin until they reach a uniform, prescribed depth. Our pins and brackets are fabricated under strict engineering specifications at our state-of-the-art facility. The support pins consist of a 3" OD schedule 80 steel pipe in 3' sections. These are connected with a hydraulically pressed, tapered connecter.

Procedures Our crews begin by excavating a small pit near the structure's foundation to access the bottom of the foundation. This may include removal of landscaping, sidewalks, and other items that are present.

C&N then uses the engineer's prescribed method to hydraulically advance each pin. The pin slides through a bracket under the foundation. When all the pins have been installed around the perimeter, they are welded into place. If the structure needs to be lifted back into position, it is done during this time. After all pins are welded, the soil can be returned to each location and the stabilization process is complete.