The San Gabriel Trench Project is being built in the city of San Gabriel in Los Angeles County. A 2.25 km (1.4 mi) long section of the Union Pacific railway tracks is being lowered into a trench that runs through the city.
The project includes four new road and pedestrian bridges crossing the tracks. Those bridges will ensure a safe transit of the railway line for the almost 90,000 vehicles using the roads every day. Consequently, the long wait times and the ensuing environmental impact will be eliminated.
The 9.14 m (30 ft) deep and 19.81 m (65 ft) wide trough structure is being built using the open cut method. Once the excavation and stabilization measures have been finished, concrete walls will be erected in the trench, and the new railway tracks will be placed.
Different anchor systems were required to stabilize the excavation walls. DSI Construction USA produced and supplied 202 temporary, 3-6 strand strand anchors with approx. 13.3 km (43,700 ft) total length.
2,206 strand anchors with 229 km total length
Furthermore, 2,206 permanent, double corrosion protection (DCP) 4-10 strand strand anchors were installed in the excavation. The permanent anchors utilize strand with a total length of nearly 229 km (751,000 ft).
DSI also produced and supplied 433 permanent DCP bar anchors. More than 5 km (16,700 ft) of GR 150 THREADBAR® was used for the bar anchors. Furthermore, DSI supplied the equipment for testing and stressing the strand and bar anchors. The jacks ensured efficient and fast tensioning and a time-optimized lock off of the anchors.