| Advance/routine specialty contracts |
- Treat hot spots as separate contracts.
- Rock cut Sta. 2730+00:
- Rosie's Ridge slide areas.
- Other slide areas throughout the corridor.
- Buffalo Fork Bridge approach surcharge.
- Even if you are doing stuff out of sequence, you can coordinate these types of things to save time and money.
- Try to group slide mitigation means for all sections at one time:
- Ground anchors.
- Tie-backs (soldier pile).
- Horizontal drains.
- Slope grouting.
- Toe berms.
- Soil nail wall.
- Let as advanced contracts.
- Additional funding.
- Slide development report.
- Consider outside review by consultant.
- Accelerate design of alignment and profile.
- Original roadway plan needs to be revamped.
- Merge geotech investigation with design.
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- Construction.
- Finance.
- Barrier-ability to obtain additional funding or re-prioritize available funding.
- Slide development report required to identify similar mitigation means for similar slides.
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| Rock cut at Sta. 2730+00 |
- Value engineering at this site.
- Option 1: blast and cut:
- Will require 1-2 hour closures for debris clearing.
- Night work suggested.
- Provides materials for future contracts.
- Double handling of material is an issue.
- Option 2: tunnel through hill:
- Better horizontal alignment.
- Reduced environmental impacts.
- High cost.
- Ventilation if over 800 ft.
- Work can be done through winter.
- Option 3: bridge around site:
- High cost.
- Wildlife connectivity.
- Option 4: wall with cantilever slab:
- Potential for least cost.
- Wildlife crossing barrier.
- Option 5: combine options 3 and 4:
- Short bridge(s) with walls.
- Wildlife connectivity.
- May want to do rock excavation out of sequence to acquire materials for future areas.
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- Construction
- Finance
- Barrier-night closure: Window required for blasting and clean up (2 hrs).
- Early funding or funding rearrangement (same as item #1).
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Major slide
MP 9-11 |
- Accelerate geotech and design contracts.
- Conduct VE of this site.
- Let RFP for larger landslide mitigation.
- Evaluate mitigation methods for site:
- Toe berms.
- Alternative alignments.
- Tie back walls.
- Soil nail walls.
- Sub-surface drainage.
- Lightweight fills.
- Debris flow fields.
- Catch and clean out.
- Various depths in these slide areas.
- Channel under the road.
- Consolidate all the exploration and information collected on this area in one place.
- Advanced contracts for slide repairs.
- Geotech design barrier.
- Requires minimum of 1 year study, prefer 2 years.
- Separate RFPs.
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- Construction.
- Finance.
- Barrier-funding (same as item #1).
- Environment/social barriers.
- Amend/supplement ROD w/major alignment shift.
- Requires a minimum of 1 year of study, and prefer 2 years.
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| Slide mitigation |
- List some of the things we would be doing for slide mitigation:
- Toe berms using rock materials, drainage systems, H-pile cut-off wall, rock material, tiebacks, retaining walls, re-alignment, alignment shed, lightweight embankment, removal of slide material, tieback anchors, bridge over the slide area, cantilevered structures in sharp curves and rock cuts, elevated road and bridge sections in areas of high animal migration, reinforce fabric embankment, and fabric envelope drain.
- Mix and match to each section based on the needs at that place.
- Try to handle material once, or as few times as possible.
- May have to spell out the cut and fill areas and sequences for the contractor.
- Brooks Lake lends itself for toe berm. Many of the other sites will not be available for that because of other constraints, such as easements, right-of-way (ROW), etc.
- May need to explore options of getting more easement or ROW lands in order to do some of these things.
- Established a wide corridor to anticipate future needs.
- Separate out specialty construction features into RFPs.
- RFPs for larger landslide mitigation (noted under item 3).
- Let RFPs for specialized walls and specialized areas.
- May be able to do some of these specialty construction areas to minimize impact to the traveling public.
- Three of the sections are above 8,000 feet, so the construction window is actually only 3 months.
- Look at alternate routes/alignments.
- Use old surfacing as temporary surfacing.
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- Construction.
- Finance.
- Funding (same as item #1).
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| Retaining walls |
- Precast cantilevered retaining walls (cast-in-place is not recommended for rapid construction).
- Precast walls.
- Precast footings.
- MSE walls:
- Virginia has put in an 80-ft high mechanically stabilized earth (MSE) wall. Quality control is the key.
- Drilled shaft walls.
- Gravity walls (cast-in-place or precast modular):
- Above 30 ft we are going to post tension structures. Advantage is excavation behind wall is not as extensive, quicker to put in, less cost.
- Gravity walls-precast double walls.
- Tied back walls.
- Evergreen walls (crib).
- Soil nail walls.
- Combination walls.
- Snow removal and wildlife migration are issues with any wall.
- Maintenance prefers rail closer to the road for snow plowing:
- Set walls back 5-6 ft behind a guardrail.
- Aesthetic treatment for walls:
- Form liners, etc.
- Develop theme for corridor.
- VE this area.
- Location of combined areas.
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- Construction.
- Finance.
- Contract package barrier.
- Alignment decisions (horizontal, vertical).
- Allow alternate walls with VE.
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| Structures/bridges |
- Precast as much as possible for everything, including footings.
- High performance materials on structures is a must for performance and longevity of service life (75 years).
- Minimize joints (jointless/integral):
- CT: precast and post tension is speeding; building a bridge in two days.
- Aesthetics:
- Formliners, etc.
- Develop theme for corridor.
- Surcharge approach over winter (Buffalo Fork Bridge).
- Staging area at rock cut:
- Precast issue.
- Legal loads.
- Structural steel considerations.
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- Prefabrication not normal method.
- Little experience.
- Two to three sites.
- Contractor experience w/spec type (rockcut).
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| Snowmobile underpass bridges |
- Precast culverts.
- Bebo/conspan/hyspan/etc. arches (recast bottomless).
- Corrugated arches-hold up great above the waterline where the streambed load doesn't wear away the galvanization. They are cheap and go together quick.
- Use prefabricated elements:
- Oversize to accommodate wildlife passage.
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- Precast coordination with installment and trucking (hauling) requirements, etc.
- Lane closure/temporary bridge.
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Debris flow slide areas
(sta. 1950-2020) |
- Evaluate mitigation methods.
- Consider early mitigation to reduce maintenance requirements during construction of different sections.
- If there is a type of wall in several sections of the road, but on different sections, have the contractor that is doing these types of walls do all of those walls and specialty items throughout the project. Once a contractor gets going, he can get all of them done quickly and that saves time and money.
- Can you get the materials onsite in a timely manner?
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- Construction.
- Finance mitigation.
- Coordination with maintenance:
- Coordination issue with removal at sites.
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| Buffalo Fork Bridge sequence |
- New bridge to be built off the alignment.
- Issues with pond.
- Approaches-need to address compressible soil issue.
- Approach options:
- Deep soil mixing.
- Surcharge.
- Wick drains.
- Lightweight embankment.
- Stone columns.
- Options:
- Evaluate constructability-look at letting in the fall and having it built before the snow comes.
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- Design/construction coordination to allow surcharge over winter.
- Getting surcharge in place in a timely manner.
- Move approach slabs up into earlier contract.
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| Frost heaves |
- Raise grades (elevated with rock cap).
- Pave on top of rock cap (4-in minus)-non-frost susceptible (Geology will do a test site for rock cap).
- Over excavate and replace material with drainage.
- Horizontal and vertical road drains.
- Polystyrene (styrofoam) board insulation layer.
- Horizontal geocomposite drains.
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Lane closure and mobility issues. |
Alternate materials and methods to extend
construction season |
- Are there ways to extend the ends of the construction season?
- Easier in the spring to clear out snow to start on work.
- Larger crushed aggregate material sources:
- Alternate test methods-is there anything new in testing? TRB is looking at several types of penetrometers to move away from nuclear devices.
- Is there any heavier equipment to achieve compaction?
- Geo foam.
- Use precast/prefabricated elements.
- Automatic data-loggers for concrete. Use it for concrete maturity rather than concrete temperature.
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- Construction.
- Finance.
- ITS.
- Innovative contracting.
- Liaison with Forest Service to facilitate some of these early contracts done.
- Coordination with other programs.
- "Change" implementation.
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| Contract packaging |
- Group specialty contracts by type and not by location.
- Slide mitigation (Rosie's and other sites).
- Rock cut or other alternatives.
- Bridges.
- Rearrange roadway contracts:
- Three in place of five.
- Only three contracts have major impact on traffic.
- Construction management:
- Electronic data transfer.
- Streamline shop drawing process.
- Automated management systems (PA, TX, others).
- Bid contracts in fall:
- Maximize start-up work in off season.
- Material procurement.
- Shop drawing submittals.
- Materials certifications.
- Electronic submittals to get things done earlier, shorten the turn-around time on approvals, shop drawings, etc.
- Establish an electronic data submittal site on Web site.
- Set things up "pencilless" to expedite many of these "paperwork" submittals, shop drawings, scheduling, fabrications, etc.
- If there is a statutorial requirement for a paper document with a real signature on it, that can be handled as the project goes along. For a State that is not doing this now, how long does it take to get this thing up and running? 6 to 8 months. FHWA would cooperate to send a team to a State that has already set this up and has it running.
- Off-season submittals and approvals-get all the paperwork part of the project done in the 7 to 8 months (winter) when the contractor cannot be on the project.
- Automated management systems.
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- Impact on current PD.
- Funding issue.
- Work force issue.
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| Durability |
- Design for durability, constructibility, inspection, and minimum maintenance.
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- Innovative contracting.
- Construction.
- Design.
- Having enough experienced people for pre-planning, design, construction, etc.
- Select materials and develop details to enhance construction and minimize future maintenance.
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| Out of sequence work |
- May spend the first 3 years doing mitigation of slides and retaining walls, and the last 2 to 4 years doing the actual road construction.
- Folks in finance and design need to be onboard with giving us the ability to get some of this specialty construction done out of sequence.
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- Innovative contracting.
- Construction.
- Finance.
- Impact on project design.
- Need financing and design people on board.
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