Two tunnels (Beam tunnel and Service tunnel) are allocated for bds part


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Two tunnels (Beam tunnel and Service tunnel) are allocated for BDS part

  • Two tunnels (Beam tunnel and Service tunnel) are allocated for BDS part

    • On TBM case (Case 1 ~ 5) are the same layout (φ 4.5m for both tunnel)
    • On NATM case (Case 6 ~ 8) are the same layout (W=4.5m H=4.0m for both tunnel)
  • RTML loop part is constructed by NATM

  • Sub tunnel (Case 3, 4, 5 and 6) is allocated Damping ring side



Based on the RDR tunnel design

  • Based on the RDR tunnel design

  • Inner diameter is 4.5m both

  • Using TBM to excavate these tunnels

  • Six access halls with access tunnel (1km long sloped tunnel) from ground surface



Single large diameter tunnel includes all equipment

  • Single large diameter tunnel includes all equipment

  • Inner diameter is 7.4m

  • Using TBM to excavate these tunnels

  • The tunnel is separated with 0.4m thick concrete floor

  • Six access halls with access tunnel (1km long sloped tunnel) from ground surface



XFEL layout (TR and KL is located in Beam tunnel, other equipments are in A/H)

  • XFEL layout (TR and KL is located in Beam tunnel, other equipments are in A/H)

  • Tunnel configuration is composed of Beam tunnel & sub tunnel

  • Inner diameter is 5.2m and 3.2m for Beam tunnel and sub tunnel respectively

  • Using TBM to excavate these tunnels

  • Six access halls with access tunnel (1km long sloped tunnel) from ground surface

  • Pulse modulators are installed in A/H



KCS layout

  • KCS layout

  • Tunnel configuration is composed of Beam tunnel & sub tunnel

  • Inner diameter is 4.5m and 3.2m for Beam tunnel and sub tunnel respectively

  • Using TBM to excavate these tunnels

  • Twelve access halls with access tunnel (1km long sloped tunnel) from ground surface

  • All equipments are installed in A/H



DRFS layout

  • DRFS layout

  • Tunnel configuration is composed of Beam tunnel & sub tunnel

  • Inner diameter is 5.7m and 3.5m for Beam tunnel and sub tunnel respectively

  • Using TBM to excavate these tunnels

  • Six access halls with access tunnel (1km long sloped tunnel) from ground surface

  • Local caverns at 617m intervals (4 cryo strings length) for installation of cooling equipment



DRFS layout

  • DRFS layout

  • Tunnel configuration is composed of Beam tunnel & sub tunnel

  • Inner section is 5.7m and 3.3m for Beam tunnel and sub tunnel respectively

  • Using NATM to excavate these tunnels

  • Six access halls with access tunnel (1km long sloped tunnel) from ground surface

  • Local caverns at 617m intervals (4 cryo strings length) for installation of cooling equipment



DRFS layout

  • DRFS layout

  • Appropriate section can be excavated to install various equipments

  • The tunnel is separated by partition concrete wall (t=0.4m)

  • The wall thickness is selected to be sufficient to protect installed equipments from radiation

  • Inner section of Beam Tunnel is W=9m H=4.5m

  • Using NATM to excavate these tunnels

  • Six access halls with access tunnel (1km long sloped tunnel) from ground surface

  • Local cavern can be omitted because of enough space for equipments installation







Experimental Hall

  • Experimental Hall

    • According to KEK’s information


Local Cavern

  • Local Cavern

    • In consideration of equipment layout,


Access Hall

  • Access Hall





Access Hall (XFEL & KCS)

  • Access Hall (XFEL & KCS)

    • Attached access hall that contain the following facilities is considered for XFEL & KCS




Basic condition

  • Basic condition

  • Construction plan & procedure

  • Schedule

  • Cost estimation assumption

  • Unit cost for estimation

  • Component of unit cost

  • Unit cost

  • Construction cost for each case



In consideration of the situation that ILC site is in Japanese mountainous area, tunnel layout and design are planned

  • In consideration of the situation that ILC site is in Japanese mountainous area, tunnel layout and design are planned

  • As access route to Experimental Hall and Access Hall, inclined tunnel (drift) is adopted in all cases



Cost for Case 7 is the lowest

  • Cost for Case 7 is the lowest

  • Case 7 and Case 8 have almost the same construction period

  • The difference between Case 7 and Case 8 is the thickness of partition wall



Beam Tunnel (TBM)

  • Beam Tunnel (TBM)

    • After the end of Access Hall (A/H) construction, Beam Tunnel excavation will be commenced
    • TBM assembling will be carried out in A/H
    • One way excavation from A/H
    • In double tunnel case (Case 1, 3~6), 2 months later from first tunnel excavation commencement, second tunnel will be commenced


Beam Tunnel (NATM)

  • Beam Tunnel (NATM)

    • Construction Adit will be constructed in addition to the Access Tunnel at A/H
    • As a result, Beam Tunnel and A/H can be excavated in parallel
    • Tunnel excavation can be carried out in the opposite direction from A/H (2 faces)
  • Beam Tunnel (others)

    • Excavation and concrete lining can be carried out in parallel on Case 2, 7 and 8
    • However, detail construction method should be considered for Case 7 especially, because the tunnel size is comparatively-small
    • NATM excavation is adopted on RTML loop part in all cases


Access Hall (A/H)

  • Access Hall (A/H)

    • Approaching through Access Tunnel
    • Top and bottom drift will be constructed, one is a top drift for the top of A/H, the other tunnel is for the bottom of A/H
    • Pier and slab which is needed for installation various equipments will be constructed after Beam Tunnel construction in the meantime






Experimental Hall (E/H)

  • Experimental Hall (E/H)

    • Approaching through Access Tunnel
    • Access Tunnel will be branched into two tunnels along the way, one is a top drift for the top of E/H, the other tunnel is for the bottom of E/H
    • Excavation method is bench cut
    • Shaft (glory hole) will be constructed and utilized for mucking


Local Cavern

  • Local Cavern

  • Damping Ring Tunnel (DR)

    • Approaching through Access Tunnel from portal, which is connected with opposite side of E/H access tunnel
    • In the case of TBM, when the access tunnel come at DR Service Cavern, DR excavation will be commenced, because DR service cavern is needed for TBM assembling
    • In the case of NATM, when the access tunnel intersect with DR, DR excavation will be commenced. After that when the access tunnel come at DR service cavern, DR will commenced as counter excavation as well






Difference between TBM and NATM for A/H & Beam Tunnel excavation

  • Difference between TBM and NATM for A/H & Beam Tunnel excavation

    • Access Hall should be constructed initially because of TBM assembling
    • One-way excavation for Beam Tunnel between each A/H
    • Access Hall and Beam Tunnel can be excavated in parallel
    • Beam Tunnel is constructed through construction Adit that is branched from Access Tunnel.
    • Counter excavation can be executed (two faces excavation can be carried out from each Construction Adit)




Necessary construction period for TBM

  • Necessary construction period for TBM

    • According to Japanese TBM vendor’s information,




Necessary construction period for NATM

  • Necessary construction period for NATM

    • According to Japanese Standard for excavation (Ministry of Land, Infrastructure, Transport and Tourism),






Construction schedule for large cavern apply common cycle time (count by minutes) of underground power plant

  • Construction schedule for large cavern apply common cycle time (count by minutes) of underground power plant

    • Drilling, Charging, Blasting, Chipping (Scaling), Mucking, Shotcrete, Steel Support, Rock Bolt, Loss/Others


Access Hall

  • Access Hall





The detail of construction schedule is shown in P18~25 of the case studies report.

  • The detail of construction schedule is shown in P18~25 of the case studies report.



TBM tunnel

  • TBM tunnel

    • Cost estimation standard issued by NEXCO (Nippon Expressway Company Limited) applied to TBM cost estimation
    • Concrete lining support was adopted
      • As a result of pre-cost-estimation for TBM lining in three types, one is concrete lining, another concrete segment, the other shotcrete lining, concrete lining was adopted because of inexpensive
      • However, in the case of sub tunnel of Case 3, 4 and 5, shotcrete lining was adopted


NATM tunnel

  • NATM tunnel

    • Japanese Standard (Ministry of Land, Infrastructure, Transport and Tourism) applied to NATM cost estimation
    • However, this standard doesn’t cover small section tunnel (under 20m2), therefore previous standard in which standard cycle time for excavation is shown applied to the small section tunnel


Experimental Hall

  • Experimental Hall

    • There is not a standard for large cavern cost estimation, that’s why, the cost is referred to the past cost record of similar cavern (underground power plant)
  • Access Hall & Local Cavern



Labor

  • Labor

    • Work on a two-shift
    • 10hrs working for one-shift
    • Transmittal unit cost for labor for public work issued by Ministries
  • Equipment

    • Japanese Standard issued by Ministry applied to equipment cost estimation
    • As for TBM, Japanese vendor’s quotation applied to equipment cost estimation


Material

  • Material

    • Economics research firm data applied to material cost estimation
    • Material cost for TBM is referred to vendor’s quotation


Excavation (= Direct Cost + Indirect Cost + Others)

  • Excavation (= Direct Cost + Indirect Cost + Others)

    • Direct cost
      • Excavation (labor, material, equipments, repair, maintenance, electricity, consumption articles, etc.)
      • Mucking (labor, materials, equipments, conveyer, electricity, etc.)
      • Shotcrete (labor, materials, equipments, electricity, etc.)
      • Support (material, equipment, electricity, etc.)
      • Invert segment (labor, materials, equipments, etc.)
      • Concrete lining (labor, materials, formwork, equipments, etc.)
      • Wave guide (labor, materials, etc.)
      • Partition wall (labor, materials, formwork, equipments, etc.)
      • Grouting (10% of TBM sum, 20% of NATM sum)
      • Miscellaneous work


Indirect cost

    • Indirect cost
      • 65% of TBM works + 100% of NATM & auxiliary cost
        • TBM transportation, assembling, dismantlement
        • Temporary works
        • Common works
    • Others
      • 10% of total cost (direct + indirect cost) as contingency expense


Unit cost for cavern excavation

  • Unit cost for cavern excavation



Unit cost for tunnel excavation

  • Unit cost for tunnel excavation







The construction period for Case 3 & 4 are longer than other cases because of large A/H

  • The construction period for Case 3 & 4 are longer than other cases because of large A/H

  • Case 5 has the highest cost because of large diameter tunnel

  • Case 7 has the lowest cost because of only one tunnel excavation and the tunnel size is comparatively small

  • Case 7 & 8 has the almost same construction period

  • The reason that Case 8 has bigger cost than case 7 is due to concrete partition wall cost




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