February 17, 2011 Los Angeles MTA, Metro Gold Line Eastside Extension, Boyle Station U-LINK LIGHT RAIL TUNNELS

February 17, 2011

Los Angeles MTA, Metro Gold Line Eastside Extension, Boyle Station

U-LINK LIGHT RAIL TUNNELS

1. OVERVIEW OF U220 PROJECT

2. SLURRY WALL INSTALLATION

3. CROSSOVER EXCAVATION

4. TUNNEL EXCAVATION

5. CROSSPASSAGE EXCAVATION

6. QUESTIONS

Los Angeles MTA, Metro Gold Line Eastside Extension, Herrenknecht Shop


a. TRAYLOR FRONTIER-KEMPER JOINT VENTURE

b. BID DATE MARCH 25, 2009

c. BID PRICE $309,175,274 d. NTP JANUARY 4, 2010

e. FOUR INTERIM MILESTONES

f. FINAL COMPLETION OCTOBER 2, 2013

g. LIQUIDATED DAMAGES UP TO $20,000 PER DAY



a. RECONFIGURE SOUTH STANDS PARKING

b. UTILITY RELOCATIONS AND DEMOLITION

c. SITE SHORING AND MASS EXCAVATION

d. SLURRY WALL EXCAVATION

e. CROSSOVER BOX EXCAVATION AND BRACING



a. TWIN BORED TUNNELS EACH 11,400 FT LONG

b. 2 EA EARTH PRESSURE BALANCE TBMs WILL BE UTILIZED

c. BOLTED GASKETED PRECAST TUNNEL LINING

d. 16 EA CROSSPASSAGES EXCAVATED USING SEQUENTIAL EXCAVATION METHODS

e. GEOLOGY

i. PRIMARILY STIFF CLAY

ii. VALLEYS OF SILT AND SAND

iii. GROUNDWATER TABLE RANGING FROM 55 FT TO 200 FT ABOVE TUNNEL



MAJOR SUBCONTRATORS

•OMA CONSTRUCTION• SITE EXCAVATION AND PAVING

• UNDERGROUND UTILITIES

• FENCING AND CONSTRUCTION WALLS

•CONDON JOHNSON / NICHOLSON JV• TEMPORARY SHORING

• SLURRY WALLS

•HAYWARD BAKER• JET GROUT BLOCK FOR NORTH LINK



TRAYLOR / FRONTIER-KEMPER JV SELF PERFORM

•SHAFT EXCAVATION

•SLURRY WALL BRACING

•STATION INVERT

•TBM TUNNELS

•CROSSPASSAGE EXCAVATION

•TUNNEL SIDEWALK AND INVERT CONCRETE







EQUIPMENT – MECHANICAL CLAMSHELL



EQUIPMENT – HYDROFRAISE



EQUIPMENT – DESANDING PLANT



GUIDEWALLS



EXCAVATION



REBAR INSTALLATION



CONCRETE POURING

3. CROSSOVER BOX EXCAVATION & BRACING




BRACING PRE-FIT UP AT SHOP



BOX EXCAVATION

ADD PHOTO OF BOX EX



BOX EXCAVATION



BRACING INSTALLATION

OVERVIEW OF TUNNELING TECHNIQUES

ROCK:• Drill and Blast• TBM – Gripper and Shielded

SOFT GROUND:• Digger Shield• Sequential Excavation Method• Compressed Air Shield• Earth Pressure Balance TBM• Slurry Pressure Balance TBM


SDCWA, San Vicente Pipeline Tunnel, Reach 4 East, Slaughterhouse Shaft


DRILL AND BLAST MINING

SDCWA, San Vicente Pipeline Tunnel, Reach 5 East, Muck Bay




SDCWA, San Vicente Pipeline Tunnel, Reach 5 East, Muck Bay






HARD ROCK TBM MINING

SDCWA, San Vicente Pipeline Tunnel, Reach 6, San Vicente Portal




SDCWA, San Vicente Pipeline Tunnel, Reach 6, San Vicente Portal




SDCWA, San Vicente Pipeline Tunnel, Reach 6



WHAT DOES EARTH PRESSURE BALANCE MINING MEAN?

IN BASIC TERMS, IT MEANS PROVIDING TUNNEL FACE SUPPORT, BY USING EXCAVATED MATERIAL, TO PREVENT OVER-EXCAVATION AND SURFACE SETTLEMENT.

THE EXCAVATED EARTH IN THE EXCAVATION CHAMBER IS USED TO BALANCE THE COMBINED EARTH AND WATER PRESSURE ACTING ON THE FACE OF THE TUNNEL.

4. TUNNEL EXCAVATION – EPB METHOD


WHAT ARE THE IMPORTANT PARTS OF AN EPB TBM?

1. TUNNEL FACE

2. CUTTERHEAD

3. EPB CELLS

4. EXCAVATION

CHAMBER

5. PRESSURE BULKHEAD

6. THRUST CYLINDERS

7. SCREW CONVEYOR

8. ERECTOR

9. TUNNEL LINING

1

2

4

5

6

78

9

3

Courtesy Herrenknecht AG



HOW DO YOU “DO” EPB MINING?

BALANCE THE CHAMBER PRESSURE WITH THE ACTUAL EARTH AND WATER PRESSURE




KEEP THE CHAMBER FULL

PARTIALLY FULLCHAMBER

VOID SPACE




KEEP THE CHAMBER FULL

PARTIALLY FULLCHAMBER

VOID SPACE



WHERE IS EARTH PRESSURE BALANCE MINING UTILIZED?

a. SOFT GROUND i.e. SAND, SILT, AND CLAY

b. BELOW THE GROUNDWATER TABLE c. “SPECIAL” GROUND CONDITIONS

d. IN PLACE OF COMPRESSED AIR TUNNELS



SHIELD AND TRAILING GEAR (SEE PAPER DRAWING)



SHIELD AND TRAILING GEAR



CUTTING TOOLS• CUTTERS – 18 EA

• SCRAPERS – 48 EA

• BUCKET LIPS – 16 EA

• RIMBAR TOOL – 1 EA

• RIPPERS (OPTIONAL)



TBM MAN LOCKS



TBM MAN LOCKS







5. CROSSPASSAGES

Los Angeles MTA, Metro Gold Line Eastside Extension, Crosspassage Excavation


5. CROSSPASSAGES

Los Angeles MTA, Metro Gold Line Eastside Extension, Holed-Through Crosspassage


6. QUESTIONS?

Los Angeles MTA, Metro Gold Line Eastside Extension, East Portal


Documents

February 17, 2011 Los Angeles MTA, Metro Gold Line Eastside Extension, Boyle Station U-LINK LIGHT RAIL TUNNELS