Below-Grade Parking Garage Construction in Bellevue, WA.

In the heart of Bellevue, Washington, amidst the bustling downtown corridor, Malcolm Drilling was contracted to install dewatering and retention systems for an 8-story below-grade parking garage. The 60,000-square-foot, 90-foot-deep parking garage at Four106, a Class A office space development, was built by Malcolm using soldier pile and dewatering techniques.

Malcolm began by installing soldier piles, each extending over 110 feet in depth, to form the backbone of the entire structure.

Moving ahead with the excavation, Malcolm turned to the Davey DK920 drilling system, an innovative piece of equipment that facilitated the installation of 8-inch tie-backs reaching an impressive length of 90 feet with only one auger break.

To achieve seamless auger exchanges during the drilling process, Malcolm employed a 238-excavator equipped with a manipulator attachment. This strategic choice proved invaluable, streamlining operations and enhancing overall efficiency on the site.

As the excavation reached deeper levels, the challenge of managing groundwater became paramount. Malcolm proactively addressed this concern by planning the installation of a dewatering wellpoint system. This system effectively controlled water levels and prevented any unwanted water ingress, providing a dry and secure work environment as the team completed the lower levels of the garage.

Malcolm Drilling