Hoover Dam Bypass Project
Clark County, NV & Mohave County, AZ


URS designed a wireless blast monitoring system to record the levels of ground movement during the blasting operations at the base of each of the bridge pier locations.

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Project Details

United States Highway 93 (U.S. 93) has been designated a North American Free Trade Agreement (NAFTA) route. The increasing congestion caused by the switchbacks leading to the Hoover Dam site and the restrictions at the dam crossing have led to the development of the Hoover Bypass Project.

Due to the inherent structure of the rock and soil in the area where the bridge was to be built, federal officials determined that any blasting in the area near the bridge piers should not fracture the rock nor create loose rock that would fall into the river.

URS designed a wireless blast monitoring system to record the levels of ground movement during the blasting operations at the base of each of the pier locations. Additionally, the DOT required that no large rocks could fall into the river during blasting opertions and thus four wireless cameras were installed to record each of the blast events that allowed blast engineers to estimate the sizes of any rocks disturbed or moved during each blast. The principle components of the operation included:

  • 16 Blast monitoring units with triaxial geophones and serial to ethernet converters. Data was transmitted using ethernet radios.
  • 4 ethernet-based video cameras and ethernet radios.
  • All field equipment operated on solar power and was designed to withstand the severe winds in the area.
  • Computer with data retrieval and storage for both blast monitoring and video cameras.
  • Ability for cameras to store high-speed images during blast events.
  • All equipment can be operated from any location in the world.

All data and images were summarized and each month a report was filed on DVD.

 

Client

USBR and FHA

Location

Clark County, NV & Mohave County, AZ

Services

Instrumentation Automation
Video System Design and Installation for Blast Monitoring Program
Design and Installation of 35 Wireless Blast Vibration Monitors