TOKYO OUTER RING ROAD

Main Road Tunnel (Northbound) Oizumi-Minami Project‫طﺮﻳﻖ طﻮﻛﯿﻮ اﻟﺪاﺋﺮي اﻟﺨﺎرﺟﻲ‬‫ﺑﻨﺎء اﻟﺠﺴﻮر‬① Project overview

1. Map of JapanTokyo

2. Map of road networksu y
Et an- ssw
Ka rep
Ex

Tokyo Outer Ring
(connecting Kan-Etsuand Tomei Expressways)
Total length of 16.2km

Metropolitan
Inter‐City
Expressway
SaitamaPrefecture

Tokyo
Prefecture

Approx. 15km
radius from thecenter of Tokyo

Oizumi JCT

Chuo JCT

Chuo
Expressway
i yemaTo ssw
rep
ExTomei JCT

Central CircularRouteChiba
Prefecture

Kanagawa
Prefecture

10km

TAISEI CORPORATION
https://www.taisei.co.jp/english/TOKYO OUTER RING ROAD

Main Road Tunnel (Northbound) Oizumi-Minami Project‫طﺮﻳﻖ طﻮﻛﯿﻮ اﻟﺪاﺋﺮي اﻟﺨﺎرﺟﻲ‬‫ﺑﻨﺎء اﻟﺠﺴﻮر‬2. Direct cutting of existing concrete piles
Hikawabashi BridgeoShirakerv
iRaw

ga

MejiroS

treet

Overview of existing piles[Shirakogawa River shoreprotection]
Steel-reinforced concrete piles
Φ1.2 m x 19 piles[Hikawabashi Bridge base (MejiroStreet)]
Concrete piles
Φ1.2m x 27 piles

Modified river
structure (withnewly installedbox culvert)

Existing underground Φ1.2m piles will bedirectly cut using:
An inclined cutter head (5°) fitted withspecially reinforced pre-cutting bits.
The cutting performance has beenvalidated through a verification test
simulating the actual piles.

1.2m concrete piles

1.6m mud-pressure shieldmachine3. Features of the cutter head and bits
Optimized for
obstruction cutting[Cutter head]
5o-inclined cutter head
[Bit]
Specially reinforced pre-cutting bits
(1,155 bits mounted)
Fan-shaped, tough and impact-resistingtype
Three times as much tip volume asconventional cutter bits*

Cutter head front view
(66.4％ opening)

5°-inclined
cutter headCarbide tip(type E5)

No bit replacement required for over 7kmof excavation (margin of 1.7 over theplanned excavation distance)[Cutter rotation and propulsion drivemechanism]
High-speed cutter rotation of 0.86 rpm
Very low-speed propulsion of 1 to 10mm/min.

Specially reinforced pre-cutting bits
*Comparison with conventional obstruction-cutting bit performance

TAISEI CORPORATION
https://www.taisei.co.jp/english/

TOKYO OUTER RING ROAD

Main Road Tunnel (Northbound) Oizumi-Minami Project‫طﺮﻳﻖ طﻮﻛﯿﻮ اﻟﺪاﺋﺮي اﻟﺨﺎرﺟﻲ‬‫ﺑﻨﺎء اﻟﺠﺴﻮر‬③ Segment overview

1. Longitudinal section of the geological layers

Start ofexcavation

Toneri Layer
Mainlayers toexcavate
through

Edogawa Layer
A layer predominantly consisting ofcompacted gravel but containing
bands of compacted sand and hardcohesive soil

A layer containing alternating bands of compacted gravel, sand and hard cohesive soil

2. Features of the segments
TypeRC segment

Overview

HB® segment (synthetic)

PP fiber-reinforced concrete

PP fiber-reinforced concrete

Grip-receiving
longitudinal rib
flangeRod-shaped Grip fitting
reinforcement

Grip fitting

Steel segment

Crack prevention steel
Innerflange

Skin plateLongitudinal ribflange※Longitudinalrib web
Outer main
girder

SB joint
SB joint

Cone connectors

Dimensions,etc.

Outer diameter: 15,800 mm
Girder height: 650 mm
Width: 1,600 mm
Arc length: 4,052 mm
Number of segments: 13 (K: 1/4)

Steel guidejoin

Inner main
girder
Joint
plate

WebWebU-shaped reinforcement
block(machined)

Outer diameter: 15,800 mm
Girder height: 650 mm
Width: 1,600 mm
Arc length: 4,052 mm
Number of segments: 13 (K: 1/4)

Segment
jointingbolt

Grout hole
Ring jointing bolt

Outer diameter: 15,800 mm
Girder height: 650 mmWidth: 1,600 mm
Arc length: 4,052 mm
Number of segments: 13 (K: 1/4)

※Patent applied for HB segment (synthetic).

TAISEI CORPORATION
https://www.taisei.co.jp/english/

TOKYO OUTER RING ROAD

Main Road Tunnel (Northbound) Oizumi-Minami Project‫طﺮﻳﻖ طﻮﻛﯿﻮ اﻟﺪاﺋﺮي اﻟﺨﺎرﺟﻲ‬‫ﺑﻨﺎء اﻟﺠﺴﻮر‬⑤ Equipment overview inside the vertical shaft

1. Initial excavation
50t bridge crane
Segment stockyard
30t bridge craneCounterforce
receiverSoil modificationequipment(silo)

Soil modificationequipment(twister)
Beltconveyor

Start receivingbase
Back-up trolley

Traversing
road

Soil pit

2. Main excavation
Soil modificationequipment (silo)

25t ceiling craneIn-shaftcontinuous belt
conveyor

Soundproof enclosure

Inclined belt conveyor

Soil modificationequipment (twister)
Shuttle belt
conveyor

Soiltransportation
flow

Belt
storage
Horizontal belt
conveyor

Verticalconveyor

Soil hopper

Segment transportation
trailer

Features◆ Soundproof enclosure: 20m high x 20m wide x 130m long
◆ Soil stock capacity: 1,600m3 (for 3R)◆ No material stockyard at the starting base ⇒ Material to be supplied by direct vehicle delivery into the tunnel◆ Daily estimates (maximum)
・Soil transportation out of the tunnel: 6,000m3 ×2 JV=12,000m3/day
・Vehicle traffic: 300 vehicles x 2 JV = 600 vehicles/day

TAISEI CORPORATION
https://www.taisei.co.jp/english/

TOKYO OUTER RING ROAD

Main Road Tunnel (Northbound) Oizumi-Minami Project‫طﺮﻳﻖ طﻮﻛﯿﻮ اﻟﺪاﺋﺮي اﻟﺨﺎرﺟﻲ‬‫ﺑﻨﺎء اﻟﺠﺴﻮر‬① Project overview
Tokyo Outer Ring Main Road Tunnel (northbound) Oizumi-Minami ProjectType 2 Class 1
80km/hOizumi JCT
Underground Deepest earth
connection(frozen)

cover 57m

Φ15.8m

L=6,974m

Existing46 piles

Approx. 1km
from Oizumi
JCTOizumi
verticalshaft
Shallowest
earth
cover7m

Project specifications
Tunnel length 6,974m, floor base 6,987m, eight transverse connection shafts, underground connection (freezingmethod)
Shield machine: Mud-pressure type, outer diameter Φ16.1 m (largest in Japan)
Segment: Outer diameter Φ15.8m, 650 mm thick, 1.6m wide, 13 segments
Layer to excavate through: Toneri Layer (containing alternating bands of cohesive soil, sandy soil and gravel),
N value range: 30 to 50 and over
Earth cover depth range: 7m (smallest) to 57m (largest) (“Deep Underground Project Law” applied to 40m and deeper
locations below ground)
1km to attainment = 6km
Obstruction to be removed: 46 existing concrete piles② Features of shield work

1. Features of the shield machine
Features of the shield machine◆ Long-distance excavation capacity: 7km

Number of bits mounted: 1,155◆ Direct underground cutting of existing concrete

piles with: Inclined cutter, obstruction-cuttingbits◆ High-speed excavation : 500m per month ormore Semi-automatic erector, twin erectors

Φ16.1 m mud-pressure shield machine,
temporarily shop-assembled
at MHI Kobe Shipyard
Manufactured by: JIM Technology-

TAISEI CORPORATION
https://www.taisei.co.jp/english/◆ Compatible with very deep excavation and highwater pressure: 3-fold screw conveyors, TLL
seals etc.

TOKYO OUTER RING ROAD

Main Road Tunnel (Northbound) Oizumi-Minami Project‫طﺮﻳﻖ طﻮﻛﯿﻮ اﻟﺪاﺋﺮي اﻟﺨﺎرﺟﻲ‬‫ﺑﻨﺎء اﻟﺠﺴﻮر‬4. Obstructing-pile cutting test

Testing (simulated single pilebeing cut)Testing (cutting through a simulated soillayer inside shaft)

Exavation direction
Approx10cm

Φ1.2 m RC pile cut

Steel reinforcement debris after pile cutting

5. 3-fold screw conveyor system
No.1 screw - 16m

Bulkhead gate

No.2 screw - 18m

No.1 soil gate

No.3 screw - 16m

No.2 soil gate

No.3 soil gate

Countermeasures against soil gushing andflooding under high water pressure

Compatible with largest depth of 67 m and waterpressure of 0.7 MPa

Φ1.5 m screw conveyor(No.2 and No.3）

Φ1.5 m screw conveyors: 3-fold configuration, 50 mlong⇒ Long configuration for greater plug effect

Soil gates: Four gates provided
Bulkheads ＋ overall screw

TAISEI CORPORATION
https://www.taisei.co.jp/english/

TOKYO OUTER RING ROAD

Main Road Tunnel (Northbound) Oizumi-Minami Project‫طﺮﻳﻖ طﻮﻛﯿﻮ اﻟﺪاﺋﺮي اﻟﺨﺎرﺟﻲ‬‫ﺑﻨﺎء اﻟﺠﺴﻮر‬④ Vertical shaft to start the shield machine
1. Overview of the starting vertical shaft
SouthTo Chuo and Tomei JCTsTo NerimaNorth

Mejiro Street

SouthboundShimizu JV

Kan-EtOizsuExpumi Inresswte r
aychange

NorthboundTaisei JV

To NOuter Ring exit
To Misato JCT

Starting
verticalshaft

iiga

ta

Outer Ring entrance

2. Shield machine assembly and starting in narrow
space
Kan-Etsu E

xpressway

D- Temra pm orp arbr yidge200t50t

D ramp LH

30t
Crane bridge base

22m deep130m longShimizu JV

D ramp RH

Taisei JVCity Route #58

Temporary installation of the starting
vertical shaftFeatures◆ Effective shaft width 17.7m(outer shield diameter Φ16.1m)◆ Shaft depth: 9.5 m to 22.0m, length: 130m
◆ Working close to the Outer Ring Road
(temporary D ramp)◆ Assembly using 200t, 50 t and 30t gantry
cranesTAISEI CORPORATION
https://www.taisei.co.jp/english/

Inside of the verticalshaft

Shield machine beingassembled

TOKYO OUTER RING ROAD

Main Road Tunnel (Northbound) Oizumi-Minami Project‫طﺮﻳﻖ طﻮﻛﯿﻮ اﻟﺪاﺋﺮي اﻟﺨﺎرﺟﻲ‬‫ﺑﻨﺎء اﻟﺠﺴﻮر‬⑥ Transverse connection shaft and floor base construction

1. Transverse connection shaft construction
Structural overview

SouthboundNorthboundPipe roof + freezing
Chemical injection

Rectangularsteel shell

Internal
open reinforcement
beams

Excavation L

For human use: For emergency evacuation (6 shafts), hollow space B2600×H2500
For human and vehicle uses: For human evacuation and emergency vehicle passage (2 shafts), hollow
space B4300×H3900

2. Floor base construction
Floor base construction overview

PC floor baseGap-fillingconcrete

PC floor baseSide wall(cast-in-place)

Precast PC floorbase

Loopreinforcement

Adjustment concrete(with trough)2-segment inner wall(gate shaped +flat panel shaped)

D 16-6 bars
L = 5.456m

Seal sponge
T = 10mm

Precast invert

Precast components to be used except for side

Pre-stressing to be applied in the right-angle-to-walls and adjustment concrete blocks

bridge axis direction only L=5.5m

TAISEI CORPORATION
https://www.taisei.co.jp/english/