WORK PROCESS - VERTICAL APPLICATIONS
01 Drilling
Drill the holes of Ø102mm X 1.5m depth for Yamamoto HRB-1000 splitter, or Ø127mm X 2.5m depth for HRB-1700 splitter using a large size hydraulic crawler drill or jumbo drill rig. We recommend drilling in a staggered pattern with 500 - 700mm of spacing between holes for the HRB-1000 and 700 - 1000mm for the HRB-1700, as illustrated in the diagram.
02 Splitting
Insert the wedge into the hole and split the rock. Position the wedge so that it is splitting towards the free face. To maximise the splitter’s productivity, it is very important that the splitter is splitting towards a free face.
03 Secondary breaking and mucking
Break the already split rock into smaller pieces and remove it with a conventional excavator with a rock breaker. Removing the broken rock will keep the free face close to where the splitter is working. Secondary breaking and splitting can be conducted simultaneously.
Remove the muck using a hydraulic excavator, wheel loader or similar machine.
WORK PROCESS - HORIZONTAL APPLICATIONS
01 Drilling
Create a free face by drilling slots in the centre, bottom or periphery. Then drill split holes for the Yamamoto Splitter between the slots. Proper slot drilling involves drilling overlapping holes as bridges between the holes to allow the rock to maintain its structural integrity. A special attachment on the jumbo boom may be required for slot drilling. The photo and drawing below exemplify some recommended drilling patterns.
02 Splitting
Use a splitter mounted on a customised carrier equipped with telescopic boom and rotator. Start splitting the holes closest to the free face and aim at working from the bottom and up to allow support from gravity. Split in three steps by first inserting half of the total length of the wedge and split, then ¾ of the total length and split and finally the full length of the splitter.
03 Secondary breaking and mucking
Break out the cracked rock into smaller pieces using a hydraulic breaker mounted on a conventional excavator. Work along the cracks caused by the Yamamoto Splitter. Use a muckling method that suits each project, typically done with a standard excavator.
Use a muckling method that suits each project, typically done with a standard excavator.