The following update comes from the Church Newsroom. To read the full report, CLICK HERE.
The Salt Lake Temple renovation project recently hit another milestone with the completion of vertical coring. This monumental three-year process (the most extensive single activity on-site to date) entailed drilling 46 holes through its granite-like (quartz monzonite) stone walls, from the tops of each corner of its six towers to the new upper foundations over which the sacred structure now rests.
Hollow, diamond-edged drill bits were attached to hollow drill rods five feet long and about two and a half inches in diameter. The drill rods were threaded and connected to form what are called drill strings.
Through innovative engineering, the holes were kept within a parameter of three-eighths of an inch of the entire average cored depth of 150 feet. Four drills were placed by crane at the top of the temple towers to perform this feat. This process cut more than two and half miles of stone cores.
The holes were reamed and now house bundles of post-tension cables, part of the temple’s seismic upgrade base isolation system. The steel cables are attached to reinforced steel structures in the towers and roof, threaded through the temple exterior walls and attached to its new foundation, then tightened to half a million pounds. The tension compresses the historic structure to withstand high-magnitude earthquakes.
Watch a video of this innovative engineering process performed from the towers of the temple below.
To read the full report, CLICK HERE.