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Doorframe Slab Method

B 27 Bypass Tunnel Oberrieden

Service Performed
Detailed design, instrumentation and construction supervision
Commencement - Services
December 28, 1990
Completion - Services
December 28, 1992
Location
Bad Sooden-Allendorf
37242 Oberrieden, Hesse
Germany
Technical data

Two lane road tunnel, 520 m length, construction techniques incl.: NATM, Doorframe Slab Method, Cut & Cover, Barrel Vault Method under existing railway embankment.

Geology description

Bunter Sandstone (sandstone, clystone), sand, clay and 120 year old railway embankment (rock fill, sand, clay, gravel).

Geology Types: Mixed Face

Description

The German Federal Railway Authority imposed high demands on safety since it did not allow for any disruption to railway traffic.

Barrel Vault Method, Doorframe Slab Method

Activity
Final cost
$12,500,000
Special Construction techniques
Barrel Vault Method, Doorframe Slab Method

Boston Central Artery Project, C19E1 - I93 Leverett Circle / Storrow Drive Connectors

Service Performed
Detailed Design including Contract Documents
Commencement - Services
April 30, 1997
Completion - Services
October 22, 2003
Location
Boston, MA
United States
Technical data

Ramp S-N, two lane highway, total length 600 ft, span 41 to 48 ft. Doorframe Slab Method adopted in areas where the cover was < 10 ft. Utility room breakout and pump station shaft. Reinforced shotcrete primary lining; waterproofing system with a reinforced conrete secondary lining.

Geology description

Fill, Organic Silt, Fine Sand and Silt, Alluvium, Marine Clay, Glaciomarine Drift and Outwash, Glaciolacustrine sediments overlying Argillite and Hornfels bedrock at depth. Groundwater approximately 8 ft below ground surface.

Special Construction techniques
Doorframe Slab Method

Taguatinga Tunnel

Service Performed
Doorframe Slab Design Review and Construction Advice
Commencement - Services
December 30, 1997
Completion - Services
December 29, 1999
Location
Brasilia -
Brazil
Technical data

Metro tunnel, 3,950 ft (1200 m) long with a section of approx. 660 sqft (62 m²). Overburden varied from 10 - 15 ft (3 - 5 m), reinforced concrete slab 2 - 4 ft thick.

Geology description

Porous clay, sandy clay, weathered slate, weathered siltstone.

Geology types
Final cost
$20,000,000
Special Construction techniques
Doorframe Slab Method

JFK International Airport - Access Tunnel

Service Performed
Alternative design study
Commencement - Services
October 21, 2001
Completion - Services
October 21, 2001
Location
New York, NY
United States
Technical data

Two twin tunnels, rail and highway, with a total length of 2,000 ft (610 m) each.

Geology description

Hydraulically filled sand, organic silt, clay and peat, glacial sand, non-compacted fines and occasional gravel.

Geology types
Description

Design study on feasibility of construction of tunnels beneath active airport taxiway using systematic dewatering wells and Door Frame Slab Method.

Categories
Final cost
$42,000,000
Special Construction techniques
Doorframe Slab Method