IMPROVEMENT OF TRANSITION AREAS BETWEEN SLAB TRACK AND BALLASTED TRACK Makoto, SEYA R & D Center, East Japan Railway Company (JR-East), Japan 11 July 2011, Infrastructure 2 Content Part 1 Track Structure of JR-East Shinkansen Part 2 Outline of Slab Track Part 3 Issues at Transition Areas between Slab and Ballasted Track Part 4 Decision of Improved Structure Part 5 Conclusion Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number 2 1. Track structure of JR-East Shinkansen Track Length (Structure) Length Type Slab 1,848 km ( 87 % ) Ballasted 158 km ( 7 % ) others 114 km ( 5 % ) Total 2,120 km ( 100 % ) Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number Shinkansen Network of JR-East 3 2. Outline of slab track ･ Concrete slab on concrete roadbed of viaduct ･ Projection fixed to viaduct to immobilize concrete slab Advantages Concrete slab Projection fixed to viaduct ･Low rate of growth of track irregularity ･Maintenance costs: 1/5～1/3 of ballasted track Concrete Roadbed Disadvantages ･High rate of growth of track irregularity at transition areas between slab and ballasted track ･Axial force of rail which acts on viaduct and beam ･Vibration and noise Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number 228 transition areas 4 3. Issues at transition areas between slab and ballasted track Growth of track irregularity and deterioration of riding comfort by sudden change in track structure Wheel load variation by sudden change of track structure Maximum train speed 210 km/h （1982） 300 km/h （2012） 320 km/h （2013） Track irregularity Increase of impact load by speed-up A need to control growth of track irregularity Viaduct train direction Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number 5 3. Issues at transition areas between slab and ballasted track Void under sleeper (mm) Field survey verifies areas of irregularity How to measure void under sleeper 0 -0.5 -1 -1.5 -2 -2.5 -3 -1 0 1 2 3 4 5 1.Unscrew fastening bolts 2.Tap the top of sleeper Distance from boundary (Ballasted side) (m) 4 meters of ballasted track from boundary are influenced by sudden change in track structure Conduct countermeasures over 5 meters Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number 6 3. Issues at transition areas between slab and ballasted track Types of countermeasures against growth of track irregularity ･ Maintenance ･ Structural improvement Policy: Control of wheel load variation Measures: ･ Enlargement of bearing area ･ Low elasticity ･ Track stiffening 急激な軌道構造変化による輪重変動 高低変位発生 Track stiffening e.g.) Auxiliary rails, Ladder sleeper Low elasticity e.g.) Rail pads スラブ軌道（ 剛） Enlargement of bearing area e.g.) Wider sleepers, Increasing sleepers Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number バラスト軌道（柔） 7 4. Decision of improved structure Dynamic analysis model of track Decision process mB STEP 1 Selection of parts for combination ks Some choices of measures based on policy IT Analysis Cs Secondary まくらばねspring mT kp Cp kp mw mw 台車枠 Bogie frame Cp 軸ばね Axle spring 車輪 Wheel 車輪／レール接触ばね Contact spring レール Rail 軌道支持ばね Track supporting spring Valuation by rates of growth of track irregularity STEP 2 Decision of improved structure Some combination of effective choices Analysis Output: ･Wheel load variation ･Displacement of rail ･Ballast acceleration (A) ･Pressure on sleeper bottom plane (B) Valuation basis: ･Rate of growth of track irregularity (the product of A and B) Valuation by Rates, Cost, Workability and Maintainability Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number 車体 Body 8 4. Decision of improved structure ＳＴＥＰ 1 Selection of parts for combination 4: Auxiliary rails (10m) 3: Ladder sleeper (5m) 6: Low elasticity rail pads (5m) 1: Wider sleeper (5m) 2: Increasing sleeper (9 sleepers to 10 / 5m) 5: Resilient sleeper (5m) Measures Rate of growth of track irregularity conventional: 100 Enlargement of bearing area 1 2 Track stiffening 3 4 Low elasticity 5 6 Wider sleeper Increasing sleeper Ladder sleeper Auxiliary rails Resilient sleeper Low elasticity rail pads ○ ○ ◎ ◎ ◎ ○ 94 88 17 43 54 94 Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number 9 4. Decision of improved structure ＳＴＥＰ 2 Decision of improved structure 4: Auxiliary rails (10m) 6: Low elasticity rail pads (5m) 2: Increasing sleeper (9 sleepers to 10 / 5m) 5: Resilient sleeper (5m) Combinations Case 1 Case 2 Case 3 Case 4 Case 5 Case 6 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ○ ◎ ◎ △ ○ ○ 34 19 21 69 44 49 Cost △ △ △ ○ ○ ○ Workability Maintainability △ △ △ ○ ○ ○ △ △ △ ○ ○ ○ △ △ △ ○ ◎ ○ Enlargement of bearing area Track stiffening Low elasticity 2: Increasing sleeper 4: Auxiliary rails 5: Resilient sleeper 6: Low elasticity rail pads High elasticity rail pads Rate of growth of track irregularity conventional:100 Valuation Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number 10 5. Conclusion Improved structure at transition areas between slab track and ballasted track Low elasticity rail pads (5m) Increasing sleepers (9 sleepers to 10 / 5m) Rate of growth of track irregularity Resilient sleepers 0.00 0.25 0.50 0.75 50% Conventional Improved 1.00 Improved structure will reduce growth of track irregularity by 50%. Field tests on lines in operation will start from November Makoto, Seya First Name, Last Name R & D center, East Japan Railway Company (JR-East), Japan Position, Company, Country 11 July 2012, infrastructure 2 Date, Session: name and number 11 ...Thank you for your kind attention
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