Signs of Construction: Building Structures
Following the grading preparation process, commuters along the I-225 Rail Line will begin to see the construction of structures such as walls and bridges.
Walls are used to support changes in grade and to hold dirt. There are three types of walls that are frequently used: caisson, cast-in-place and mechanically stabilized earth (MSE). The type of wall constructed depends on the height of the wall, the area around it and the amount of dirt it needs to support.
You can see caisson walls along I-225 near the Yale Bridge. These walls are made from drilled shafts that are covered with wall panels. They are good for tall walls in small and tight areas.
Cast-in-place walls are used on barriers that are less than 8 feet tall. Crews use forms filled with concrete and rebar to build the partition. Commuters will see this type of wall along the west side of Abilene Street adjacent to I-225.
MSE walls are used for dividers taller than eight feet and are usually in association with the approaches to bridge structures. The walls use straps that are covered with dirt in layers. As the wall gets higher, gravity and the weight of the dirt putting pressure on the straps hold up the wall. These walls will be used near the bridges over Iliff Avenue, Mississippi Avenue and 6th Avenue.