September 21st, 2010
HANKSVILLE STATION VS. SCOURUncategorized, by Catherine Higgins.
Mike Ellis, Structural Maintenance Coordinator in the Structures and Bridge Operations Division, sent in this post about the Hanksville crew’s skill and resourcefulness in repairing a box culvert.
This summer, the UDOT Hanksville Maintenance Station crew took on project typically advertised for bid to contractors and lead an effort to repair a culvert and create a safe route for S.R.-24 road users.
The Hanksville Station, working with the Structures Division and the Hydraulics Section, developed a plan to repair a scoured box culvert. The scour was caused by the change in the Fremont River’s water level due to the removal of a diversion dam.
The crew excavated the area below the box culvert then placed five levels of barriers stacked to match the bottom level of the box culvert. The barriers were stacked two upright and one down in the middle creating a flat surface for the next level. The barriers were also tied together by cable to establish an integrated block.
After getting four levels of barriers placed and being one level of barrier from the bottom of the box culvert, a flash flood occurred. The flood created a new structural safety problem by eroding the fill beneath the box culvert to the centerline of the road. The Hanksville Station coordinated with the Structures Division and created an emergency plan to address the erosion problem and finish the scour project.
The plan consisted of finishing the last level of barrier, drilling four holes in the box culvert floor (2 holes in each barrel), containing the area, and pumping concrete under the box culvert to support the structure.
The roadway was restricted to one lane over the box culvert until the concrete was in place. Approximately 120 yards of concrete was placed. The crew then finished placing large rip-rap in front of the barriers to prevent future scour from occurring.
The Hanksville Station utilized all the available materials within the area, including obtaining rip-rap by blasting a near-by slope, making this project very cost effective while providing a long term solution. The Hanksville Station worked endless hours to resolve the emergency situation and create a safe driving condition for the traveling public.
Those involved accomplished a remarkable feat; the project required fast response, skillful work and resourcefulness. The Hanksville Station brought all this in abundance and really went the extra mile to serve the citizens that rely on this route.
The Department is fortunate to have great people and all involved should be proud of the work they provided.