I-205 Corridor Widening Project Mobility Advisory ... Document...Flythrough Animation Project Start:...
Transcript of I-205 Corridor Widening Project Mobility Advisory ... Document...Flythrough Animation Project Start:...
I-205 Corridor Widening Project Mobility Advisory Committee4/17/18
Attended September, ’17; February, ’18; and March ‘18 MAC Meetings Permanent changes to vertical
clearances Reviewed OR 43 roundabout concept
Today’s Focuso Temporary Traffic Impacts for
Abernethy Bridge Worko Temporary Traffic Impacts for Rock
Blasting Worko Input on Detour Strategies for Limited
Duration Activities
Prior MAC Coordination
3
Project Overview: Flythrough Animation
Project Start:Stafford Road Interchange, MP 2.9
Project End:OR 213 Interchange,MP 9.6
Abernethy Bridge Construction StagingAbernethy Bridge Launch - Sequencing
General Bridge Sequence• Begin construction of land spans• Construct bridge foundation work (in-water)• Cantilever widening of existing bridge (8 feet +/-)• Slide existing main span northbound structure under weekend closure• Slide existing main span southbound structure under weekend closure• Construct remaining cantilever widening towards median (8 feet +/-)
Existing Abernethy Bridge Section View
Abernethy Bridge Construction StagingAbernethy Bridge Launch – Estimated Timing
General Bridge Sequence• Begin construction of land spans• Construct bridge foundation work (in-water)• Cantilever widening of existing bridge (8 feet +/-)• Slide existing main span northbound structure under weekend closure • Slide existing main span southbound structure under weekend closure• Construct remaining cantilever widening towards median (8 feet +/-)
Abernethy Bridge Section View with Outside WideningWiden prior to bridge launch
Abernethy Bridge Construction StagingAbernethy Bridge Launch – Estimated Timing
General Bridge Sequence• Begin construction of land spans• Construct bridge foundation work (in-water)• Cantilever widening of existing bridge (8 feet +/-)• Slide existing main span northbound structure under weekend closure
• (Assumed to occur late 2021 or early 2022)• Slide existing main span southbound structure under weekend closure
• (Assumed to occur approximately 1 to 2 months after northbound launch)• Construct remaining cantilever widening towards median (8 feet +/-)
*Potential bridge launch timing is still under refinement and subject to change
NB moveSB move
Abernethy Bridge Construction StagingTraffic Handling Alternatives
Traffic Management Options for Bridge Launch• Option A: Full Regional
Directional Detour• Option B: Regional
Directional Detour with limited local interchange access (Hard Closure at Abernethy Bridge)
• Option C: Regional Directional Detour with crossover at Abernethy Bridge
Abernethy Bridge Construction StagingTraffic Handling Alt: I-205 Weekend Closure Detours
I-205 NB Closed:• Require advanced notice of
closure date• Advanced signing of I-205 NB
closure• I-205 NB closed from I-5 to OR
99E• Detour to I-5 and I-84
Abernethy Bridge Construction StagingTraffic Handling: I-205 Weekend Closure Point Options
I-205 NB Closed –Alternative Access:• Access to OR99E and OR213
from south of Wilsonville• Local destination access via I-5
interchanges• Alternative “local” detour using
I-5 to OR 99E and OR 224 (Milwaukie Expressway)
“Hard Closure” of I-205 @ I-5
Abernethy Bridge Construction StagingTraffic Handling Alt: I-205 Weekend Closure Detours
I-205 SB Closed:• Require advanced notice of closure date• Advanced signing of I-205 SB closure
beginning in WA• Multiple locations under consideration for
“Hard closure”• Detour to I-5 and I-84
Abernethy Bridge Construction StagingTraffic Handling: I-205 Weekend Closure Point Options
I-205 SB Closed –Potential closure points:• @ I-84 (with or without local
access on I-205 SB)• @ OR212/224 (with or without
local access to OR 213)• @ OR 213 (with or without local
access at OR 99E)
@ I-84
@ OR224
@ OR213
Abernethy Bridge Construction StagingTraffic Handling Alt: Crossover
2-Lanes / 2-Lanes
2-Lanes / L-lane3-Lanes / 1-Lane
Only achieves 27 feet each direction
Rock Cut Construction StagingRock Blasting Area
Rock cut heights 20 to 40’
Rock cut heights 40 to 70’
Rock cut heights 20 to 40’
Rock Cut Construction StagingTraffic Handling Approach
Option (1): Blast Groupings requiring 30-40 Rolling Slow Downs• Blasting Duration = 7-8 Months
Option (2): 20-30 Rolling Slow Downs + 2 Full Weekend Closures (larger-blasts)• Blasting Duration = 6-7 Months
Rock Cut Construction StagingTraffic Handling Approach
Rock Cut Construction StagingTraffic Handling Approach
Blast Work (done in Groupings)• Pioneer Access Road – 1 week• Drill blast holes (1-2 Wks), fire Pre-split blast (1D) • Drill production Blast (1 Wk), fire Production Blast (1D)• Rough sizing and haul (1 Wk)
Rock Cut Construction StagingRolling Slow Down Description
Operations During Rolling Slowdown• Close all local interchange ramps and initiate rolling slowdown• Perform safety check and give “all clear”• Perform Blast• Give “all clear” indicating no undetonated charges• Perform clean-up and inspection of roadway• Resume traffic operations
Abernethy Bridge Construction StagingAbernethy Bridge Launch – Estimated Timing
Assumed Rock Blasting Timeline• Considering a range of timeframe for the work to occur (earlier in project vs. later)• Considering contracting options to limit total duration of rock removal (complete start to finish
duration)• Considering incentive / disincentive options to limit traffic impacts
Potential Blasting Window #1
Potential Blasting Window #2
*Potential bridge launch timing subject to change
Future MAC Meeting Topic
May, 2018• Overall Project Construction Sequence and Staging