HB PolyLift^tm is Hayward Baker’s system for the injection of lightweight polyurethane foam to shallow depths for concrete leveling and void filling. While injection of lightweight polyurethane is quick and effective, it is not the most economical or best performing method of stabilization for subsurface problems that also require injection at depth, such as bridge approaches or foundations built on fill or compressible soils. To address this issue, the HB Polylift^tm system incorporates the Denver System^tm of compaction grouting for treatment of the deeper zone if needed. This can result in significant cost savings over using polyurethane injection for the entire scope of the re-leveling project.

HB PolyLifttm Applications

Roads & Bridge Approaches Sidewalks Foundation Slabs

HB PolyLifttm Process with Compaction Grouting

Click on image to view powerpoint 1. Compaction grout columns are constructed in order to stabilize and re-level the sleeper      slab, or footings. 2. Injection holes are drilled through the concrete by means of hand drills. 3. The injection nozzle is inserted into the drill hole. The polyurethane foam expands as it      is injected and lifts the slab upward while filling voids. 4. After treatment the drill holes are cleaned of excess polyurethane foam and filled with     grout.   Drilling injection holes Injecting polyurethane   Advantages of HB PolyLifttm Deep compaction grouting costs less and is stronger than deep polyurethane injection  Small equipment Materials easily mixed on-site Easy to pump and control Non-hazardous materials HB PolyLifttm Quality Control/Quality Assurance Quality control includes procedural inspection and documentation of the work activity, testing to ensure proper mix design/injection rates, and verification of ground improvement where applicable. Pressure and lateral movement are monitored during compaction grouting to ensure that treatment stays within limits and no surrounding structures are impacted. The polyurethane injector is regulated to control the lift. Availability Hayward Baker's Denver branch is the primary branch providing HB PolyLifttm services throughout the United States. Inquiries about HB PolyLifttm should be directed to the Denver branch.