SHA "A" Rating - HCEA is pleased to announce that our Specialty Contracting Group (SCG) has received an “A” as a result of the Rating of Contractor/Subcontractor procedure by the Maryland State Highway Administration. The “A” rating was achieved for our Karst geology mitigation grouting program performed for Phase 2D of the I-70 improvement project. Hillis-Carnes had all “A’s” in the categories of Contractor Administration, Quality of Work, and Safety. The project involved the drilling and injection of grout into boreholes in thirteen areas where subsurface conditions indicated the presence or potential for voids and/or sinkholes. Subsurface conditions were explored by the HCEA Geotechnical Engineering Department as part of our total geotechnical engineering involvement with the Design-Build Team engineer, AECOM, and Contractor, Corman Construction Company.
New Equipment - HCEA is now utilizing Atlas Copco ROC D7 Hydraulic Crawler Drills for grout hole and soil and rock stabilization (tiebacks and rock bolts) drilling. This type of drill provides maximum flexibility to serve a number of drill situations. This drill’s main features include:
- High productivity
- Perfect collaring and stable drilling due to the strong and stiff boom design
- Durable cylinder-operated aluminum feed system for optimal penetration rate and drill steel life
- Long boom reach ideal for use in slope stabilization
- Dust control capability
The ROC D7 rig is equipped with a CAT stage3/TierIII engine which meets all the new exhaust emission limits and considerably reduces fuel consumption. These rigs provide 12 hours of continuous operation and secured start-up. The track frames have an optimal position and the rigs are equipped with a boom designed for precise collaring and stable drilling of quality holes. The water mist system is a tool used to stabilize bore hole walls when drilling in bad rock formations and consists of a 32 gallon pressurized water tank connected directly to the flushing air. The hole inclination and hole depth instrument assures the drilling of straight or inclined holes and fast feed positioning. The instrument also increases safety and reduces the production cost. The hydraulically positioned support leg is used for stable set up when drilling and it can also be used to stabilize the rig when moving in rough terrain.