We re using a giant machine to dig tunnels for trains.

Transcription

1 metro.net/crenshaw We re using a giant machine to dig tunnels for trains. crenshaw/lax transit project Tunnel Boring Machine Fun Facts #CrenshawTBM

2 What is a Tunnel Boring Machine (TBM)? A TBM is like a giant drill. The TBM will slowly drill through the earth, digging the tunnels needed for the trains to travel underground. The tunnels will connect three stations from Expo/Crenshaw to Leimert Park. How does it work? The front section of the TBM is called the shield. At the front of the shield is the cutter head. The cutter head is like a giant round circular cheese grater. The shield has two jobs; it drills through the dirt to create a large hole which it then lines with concrete segments to form complete rings. These rings support the tunnel. What do they do with all that dirt? The soil that has been grated away by the TBM is taken out of the tunnel in large rail cars and hauled away to a dump site. When the TBM has done its job, it will have excavated 141,000 cubic yards of soil from the ground. Why are we going to name it? Like ships, TBMs are named before they begin work for the first time, to bring good luck. A female name is chosen because historically, underground workers looked to Saint Barbara for protection. She is the patron saint for military engineers, miners and others who work underground. How slow does it go? The Crenshaw/LAX Transit Project TBM will dig a tunnel at the rate of 60 feet per day, for a >nal length equivalent to 30 football >elds. The center of the earth is about 3,959 miles down. It would take approximately 1,980 years for the TBM to bore a tunnel to the center of the earth. above & left Metro workers inspecting a TBM on the Purple Line. far left A Metro drilled tunnel, reinforced with concrete and rebar. cover image Cutter head at the front of the TBM.

3 A Journey through the Earth The TBM will dig a tunnel along Crenshaw Blvd from Exposition Blvd to Vernon St. Then it will turn around and dig all the way back to the beginning. Conveyor belts are made from layered rubber with steel wire reinforcing for strength. Wiring and motor cables are typically made of copper.

4 The body of the machine is primarily made of steel. How many people work on the machine? At any one time there will be about 15 people working in the TBM. It will house a crew headed by the TBM operator working in the machine s operating cabin. Who built it? Herrenknecht (workers below in green overalls) in Schwanau, Germany. When will it start work? It starts work in Fall of 2015, after it has been assembled and tested. It will take three months to put it together.

5 AVIATION LA CIENEGA PRAIRIE WESTERN NORMANDIE VERMONT HOOVER HIG WEST NGTON INGTON BL 1 SANTA MONICA BL CENTURY CITY PALMS PALMS BL Subject to Change JEFFERSON TCHESTER PKWY Maintenance Yard Site 405 Parking CULVER MARINA FWY MANCHESTER 90 SEPULVEDA OVERLAND 1 BEVERLY DR SAWTELLE SEPULVEDA BEVERLY HILLS Crenshaw/LAX Transit Project Map Existing Metro Rail & Station Metro Silver Line & Station CHEVIOT HILLS Purple Line Extension (under construction) Purple Line Extension (approved alignment) Exposition Transit Corridor Phase 2 (under construction) Harbor Subdivision Crenshaw/LAX Transit Corridor (under construction) Light Rail (LRT) Alignment & Station At-Grade LRT Below Grade LRT Aerial LRT LACMTA WESTCHESTER PICO ROBERTSON OLYMPIC CADILLAC Culver City CULVER CITY AIRPORT LA CIENEGA CENTINELA LA TIJERA LA CIENEGA SLAUSON FAIRFAX La Cienega/ Jefferson LADERA HEIGHTS 405 HILLCREST FLORENCE ARBOR VITAE VENICE WASHINGTON STOCKER FAIRVIEW BEACH Westchester/ Veterans Aviation/ Century HAUSER OVERHILL SAN VICENTE REDONDO MARKET BUCKLER OLYMPIC LOS ANGELES Expo/ La Brea ADAMS Farmdale WEST MARTIN LUTHER KING JR BL BALDWIN HILLS STOCKER ANGELES VISTA SLAUSON MID-CITY 60TH FAIRVIEW HYDE Downtown Inglewood MANCHESTER 90TH RIMPAU CENTURY CRENSHAW BL ROSS Expo/ Crenshaw Hyde Park WILSHIRE WASHINGTON SANTA MONICA FWY EXPOSITION 8TH 6TH CRENSHAW LEIMERT 48TH 54TH PICO VENICE Martin Luther King Jr Fairview Heights MORNINGSIDE WEST ADAMS LEIMERT Leimert Park VERNON HYDE ARLINGTON SOUTHWEST FLORENCE VAN NESS WILTON ARBOR VITAE Wilshire/ Western 8TH JEFFERSON MARTIN LUTHER KING JR BL 60TH GAGE WESTERN 10 Expo/Western Wilshire/ Normandie KOREATOWN 60TH NORMANDIE Wilshire/ Vermont Expo/ Vermont VERMONT Expo Park/ USC Slauson HOOVER FIGUEROA 3 W M 23 Manchester SEPULVEDA LAX LENNOX Hawthorne/Lennox 108TH MAIN IMPERIAL MARIPOSA GRAND NASH Mariposa Aviation/LAX RAMONA HAWTHORNE IMPERIAL HWY HAWTHORNE Crenshaw 120TH 105 ATHENS Vermont/Athens Har EL SEGUNDO El Segundo RIE N EL SEGUNDO ESS ERN ANDIE 110

6 8 ROA 2 Contact Us Please use the following contact tools to access more project information, ask questions or provide comments crenshawcorridor@metro.net metro.net/crenshaw twitter.com/crenshawtbm facebook.com/crenshawrail please recycle this material rb lacmta 2015 b #CrenshawTBM