|
|
Improving Connectivity: The Custer Interchange Project
Appendix C Construction/Innovative Materials Skill Set
Construction
| Idea Name |
Detailed Description |
Implementation Details
(barriers, skills set coordination, etc.) |
| 3-phase construction |
- Break project into 3 phases.
- Improvements to:
- Cedar St Overlay and widen.
- Sanders St, connections to Custer.
- Custer Ave. west of Sanders St.
- Frontage Road realignment.
- Interstate ramp/aux lanes work.
- Custer Ave. structure and approaches.
|
- Custer would only be closed or detoured for last phase.
- Further alleviate traffic on Cedar, N. Montana and Washington.
- Additional time for dissipation of fill settlement.
- There is greater leeway to perform work based on funding available.
- Provide better alternate route for traffic.
- Relieve congestion.
- Addresses emergency services, i.e. fire station on Forestvale.
|
| Custer Avenue - Remain Open |
- Maintain existing alignment and two-way traffic on Custer Ave with existing structure until permanent structure is complete; utilizing phase construction.
- Shift Custer alignment slightly North and maintain two-way traffic on Custer Ave with existing structure until permanent structure is complete.
- Maintain two-way traffic on Custer Ave with a temporary structure, i.e. Bailey bridge, detour bridge.
|
- Maintain two-way traffic on Custer Ave.
- Alignment shift to North would reduce impacts to utilities on South.
- Ease of construction phasing.
- Construction of new ramps could be done during the early phases.
- May be outside of the originally identified right-of-way footprint.
- Added expense.
- More construction over the interstate.
|
| Custer Avenue - Closed |
Close Custer Ave to replace the structure, which will increase the need for accelerated construction methods, i.e. Self Propelled Modular Transport (SPMT). |
- Cut the total construction time.
- Cut costs; road user, traffic control.
- Increase safety for motorists and construction personnel.
- Establishing the detour route may help to keep traffic flowing.
- Public/business relations, impacts.
|
| Interstate Structure vs. Custer Avenue Structure |
Build an Interstate bridge over the top of Cedar paralleling current I-15 alignment; single bridge with concrete barrier rail; SPMT could be incorporated. |
- Help to reduce or eliminate utility relocation/conflicts.
- Potentially reduce fill requirements.
- Reduced structure costs.
- Better pedestrian access across interstate.
- Custer Ave. would be at grade or lower (earthwork could be balanced).
- Reduce right-of-way needs.
- May require permanent and/or temporary MSE walls.
- Ramp C2 may require extension of aux lane; vehicles getting up to speed.
- Would need to revisit drainage.
|
Materials
| Idea Name |
Detailed Description |
Implementation Details
(barriers, skills set coordination, etc.) |
| Flowable Fill |
Use flowable backfill for storm drain, utilities trenches and bridge ends. |
- Decreased construction time.
- Less likely to have settlement at bridge ends.
- Reduces settlement of trench backfill and improves pavement performance.
- Increased construction costs.
- Increased lateral pressure on the backwall.
|
| Pre-cast bridge Elements |
Fabricate bridge Elements off-site, i.e. caps, deck panels, beams, etc. |
- Accelerate construction.
- Better quality product.
- Increased costs.
- Contractor inexperience.
|
| Portland Cement Concrete Pavement (PCCP) |
Full depth PCCP or White Topping, could be used on Cedar, Custer and interchange ramps. |
- Longer life cycle of pavement, i.e. maintenance.
- Increased construction time; cure time of concrete.
|
| Pulverize and Widen Existing Roadway |
Pulverize and widen Cedar and potentially Custer west of Sanders. |
- Longer service life.
- Uniform section, more opportunities for better ride.
- Increased cost.
|
| A-1-a(0) Borrow |
Better borrow material in the top two feet of the sub-grade. |
- Reduce surfacing section.
- R-60 or better readily available.
- May require excavation in thin sections.
- May only use on new construction.
|
Contract Administration
| Idea Name |
Detailed Description |
Implementation Details
(barriers, skills set coordination, etc.) |
| Contract Administration |
- Lane rental.
- A+B.
- Incentive/Disincentive (I/D).
- Internal milestones w/ A+B or I/D.
- Construction inspection during utility moves.
- Night work; limited work hours in some areas, see local ordinances.
|
- Potential to reduce construction costs.
- Potential to reduce contract time.
- Reduce impacts to traffic and the public.
- Increase safety due to shorter exposure.
|
|
Contact
Construction Feedback
E-mail Construction
|
| |
Updated: 04/04/2011 |
|
