Construction of bifurcation section of underground ... · PDF filePARIS–15 November 2017...
Transcript of Construction of bifurcation section of underground ... · PDF filePARIS–15 November 2017...
PARIS– 15 November 2017
Construction of bifurcation section of
underground expressway underneath
residential area,
Application of enlargement/widening
technology of TBM tunnel
Akihiro Nishimori, OBAYASHI Co.
Manager, Shield Tunnel Engineering Dept.
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Stakeholders
Kazuhito Uchiumi, Deputy Manager, Metropolitan Expressway Co.
Kenta Matshbara, Construction Manager, OBAYASHI Co.
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Tokyo Japan
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Yokohama North Line
8.8km
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Dual TBM for 5.5km Length
4nos Ramp Tunnels
Dual TBM for 5.5km length, mostly underneath Residential Area
4nos Ramp Tunnels, Bifurcation of road tunnel required at connection
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
● Long Section of Bifurcation
20m width Bifurcation Underneath Residential Area⇒ Construction without open cut method (i.e. tunneling work)⇒ Prevent adverse impact on residential area, with controlling settlement
Bifurcation (20m width, 200m length) x4
Main Shield Tunnel x2Ramp Shield Tunnel x4
Ground Sample
Alluvium
Loam Clay, Diluvium
Kazusa Silt(Quaternary Deposit)
Kazusa Sand(Quaternary Deposit)
Cover 28~54m
Main Shield TunnelBifurcation
Ramp Shield Tunnel
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
● Plan of Bifurcation
PARIS– 15 November 2017
Soft Ground
Conventional NATM
Water Seepage
Ground Settlement
Ground Disp.
Permeable Layer (LDPR)
Large Dia. Pipe Roof Φ1.2m
High RigidityWater Tight
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
Supported by LDPR
PARIS– 15 November 2017
LDPR Shaft by Open Cut
Land acquisition
LDPR Shaft by ESTM
(ESTM)
Enlargement Shield
Tunnelling Machine
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Thrust Jacking
Enlargement Shield Tunnelling Machine (ESTM)
Enlarged Segment
Launching Shaft
Arc Shaped Rectangular EPB 11x3m
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
①-① ④-④
12025
11388
拡大
シールド
大口径
パイプルーフΦ1200
本線
シールド
拡幅終端部 拡大シールド終端部
Max. Enlarged Section Mid. Enlarged Section LDPR Shaft by ESTM
①-① ④-④
12025
11388
拡大
シールド
大口径
パイプルーフΦ1200
本線
シールド
拡幅終端部 拡大シールド終端部
①-① ④-④
12025
11388
拡大
シールド
大口径
パイプルーフΦ1200
本線
シールド
拡幅終端部 拡大シールド終端部
ESTMLDPRLDPR
楕円形躯体(t=800)
101.5m
楕円形躯体(t=600)
40.0m
楕円形
躯体
(t=500)
5.0m
ランプシールド
到達部拡大
シールド
11.0m
Main Shield Tunnel
Bifurcation
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Grouting
Main Shield
Tunnel
Grouting for
ESTM
Grouting for
End Point
Grouting for Intermediate Wall
(Risk mitigation for seepage)
STEP1 : Grouting Work (Preparation for Bifurcation Construction)
No disruption of Main
Tunnelling Work
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
ESTM
for Shaft of LDPR (Large Dia. Pipe Roof)
STEP2 : ESTM (Enlargement Shield Tunnelling Machine)
Shat &Entrance ESTM Launching ESTM Driving ESTM Arrival
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
LDPR(27Nos/Ramp)
STEP3 : LDPR (Large Dia. Pipe Roof φ1200)
LDPR Shaft LDPR Bor. Machine Thrusting Jack Thrusting Stage
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
パイプルーフ間薬液注入
Grouting Work
(low pressure method)
Grouting
STEP4 : Grouting Between LDPR
Drilling Work Grouting Work
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Concrete Lining
Widening Excavation
STEP5 : Widening Excavation & Concrete Lining
Segment Removal Excavation Structural Work Concrete Lining
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Bifurcation Lining
STEP6 : Completion of Bifurcation
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Conclusion
1) Bifurcation with combination of ESTM & LDPR
2) No disruption and acquisition of surface ground
3) Minimize ground displacement
4) Applicable urban Highway/Railway projects
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu
PARIS– 15 November 2017
Thank you for your attention
Construction of Bifurcation – Akihiro Nishimori shutoko Obayashi Okumura Seibu