C Community Board Eight Community Board Eight C it B it B d - - PowerPoint PPT Presentation

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1 SECOND AVENUE SUBWAY PROJECT C Community Board Eight Community Board Eight C it B it B d Ei ht d Ei ht Second Avenue Subw ay Task Force Second Avenue Subw ay Task Force June 17th 2008 June 17th 2008 June 17th , 2008 June 17th ,

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SLIDE 1

1

SECOND AVENUE SUBWAY PROJECT

C it B d Ei ht C it B d Ei ht Community Board Eight Second Avenue Subw ay Task Force

June 17th 2008

Community Board Eight Second Avenue Subw ay Task Force

June 17th 2008 June 17th , 2008 June 17th , 2008

June 17th, 2008

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SLIDE 2

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Proposed Revisions to Track Alignment

PHASE 1 PHASE 1 June 17th, 2008

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SLIDE 3

BACKGROUND

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Station Designs in Final Design Phase 86th St t 2 t k t ti ( l tf ) BACKGROUND

  • 86th Street - 2 track station cavern (one platform)
  • 72nd Street - 3 track station cavern (two platforms)

Decision made to change alignment

  • Lower station track levels
  • Reduce number of tracks and platforms at 72nd Street

Reduce number of tracks and platforms at 72nd Street

  • Reduce construction cost and risk

New proposal for Station Designs (June 08) New proposal for Station Designs (June 08)

  • 86th Street - 2 track station cavern (one platform)
  • 72nd Street - 2 track station cavern (one platform)

June 17th, 2008

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SLIDE 4

THREE TRACK TO TWO TRACK

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THREE TRACK TO TWO TRACK

Three Track alignment plan g p

June 17th, 2008

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SLIDE 5

THREE TRACK TO TWO TRACK

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THREE TRACK TO TWO TRACK

Two Track alignment plan

June 17th, 2008

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SLIDE 6

THREE TRACK TO TWO TRACK

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2nd Ave

THREE TRACK TO TWO TRACK

100ft 70ft

North

June 17th, 2008

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SLIDE 7

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June 17th, 2008

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SLIDE 8

BENEFITS/IMPACTS

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Benefits BENEFITS/IMPACTS

  • Reduction in construction cost
  • Reduction in excavated material and truck trips
  • Reduction in temporary deep subsurface easements in
  • Reduction in temporary deep subsurface easements in

72nd Street area I t Impacts

  • New deep subsurface easements required in 63rd Street

area

June 17th, 2008

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SLIDE 9

NEXT STEPS

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E i t l i NEXT STEPS Environmental review Review design opportunities created by narrow er cavern at 72nd Street Commence Real Estate Acquisition process for difi d b f t modified subsurface easements

June 17th, 2008

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SLIDE 10

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Maintenance and Protection of Traffic (MPT) ( )

PHASE 1 PHASE 1 June 17th, 2008

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SLIDE 11

96 TH STREET STATION 96 TH STREET STATION 96 TH STREET STATION 96 TH STREET STATION

Existing Tunnels Lexington Ave / 96 th Street Contract 2 Lexington Ave / 63 rd Street Contract 1 Contract 2

  • Award: 4th Quarter 2008

11 June 17th, 2008

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SLIDE 12

96 TH STREET STATION 96 TH STREET STATION 96 TH STREET STATION 96 TH STREET STATION

Entrance 1 Entrance 3 Elevator Ancillary 2 y 2nd Avenue 2nd Avenue 93rd 92nd 94th 95th 96th 97th Ancillary 1 Entrance 2 June 17th, 2008 12

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SLIDE 13

96 TH STREET STATION 96 TH STREET STATION

Street Grade

96 TH STREET STATION 96 TH STREET STATION

Street Grade 7’ to 8’ Utility Zone 7’ to 8’ Utility Zone ‐0”) (48’‐0”) (28’‐4”) (48’‐ (28’‐4”) (65’‐0”)

June 17th, 2008 13

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SLIDE 14

SCOPE OF WORK SCOPE OF WORK

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SCOPE OF WORK SCOPE OF WORK

Utility Relocation between 95th Street and 99th Street

y

Slurry Walls & Decking between 95th street and

99th Street 99th Street

Excavation between 95th Street and 99th Street SOE Walls and Excavation for Entrances & Ancillaries Construction of 96th Street Station Base Slab from

92nd Street to 99th Street

June 17th, 2008

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SLIDE 15

MPT PLAN DEVELOPMENT MPT PLAN DEVELOPMENT

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CRITICAL ISSUES DURING MPT PLAN DEVELOPMENT

Interface with Ongoing TBM Launch Box Contract 26002 Construction staging is developed to maintain two block buffer Maintain Access to Metropolitan Hospital Temporary closure of Side Streets to Build Walls for Entrances and

Ancillaries

Maintenance of Left turn operation at 96th /97th Street Maintain 5 lanes of traffic on 96th St. when work is being done at 97th St. Maintain 3 lanes of traffic on 97th St. when work is being done at 96th St. Maintain 4 lanes of traffic on Second Avenue Maintain 7’ sidewalks

June 17th, 2008

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SLIDE 16

MPT PLAN MPT PLAN

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MPT PLAN MPT PLAN West Side Utility Relocation

93rd Street 92nd Street 94th Street 95th Street 96th Street 97th Street Walkway SECOND AVE 91st Street

Present Contract (91st Street to 95th Street) C-26005 Work Zone (95th Street to 99th Street)

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SLIDE 17

MPT PLAN MPT PLAN

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West Side Slurry Wall Installation, Decking & Excavation MPT PLAN MPT PLAN

Walkway 92nd Street 93rd Street 94th Street 95th Street 96th Street 97th Street SECOND AVE 91st Street

Present Contract (91st Street to 95th Street) C-26005 Work Zone (95th Street to 99th Street)

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SLIDE 18

MPT PLAN MPT PLAN

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East Side Slurry Wall Installation, Decking & Excavation MPT PLAN MPT PLAN

93rd Street 92nd Street 94th Street 95th Street 96th Street 97th Street Walkway SECOND AVE 91st Street

Present Contract (91st Street to 95th Street) C-26005 Work Zone (95th Street to 99th Street)

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SLIDE 19

MITIGATIONS MITIGATIONS

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Additional Variable Message Signs

MITIGATIONS MITIGATIONS

Additional CCTVs Additional Traffic Agents Signal Timing Modifications at 2nd Avenue /96th St., Third Avenue /

96th St., First Avenue/ 97th St., 2nd Avenue/ 97th St.

Extend right turn restriction time period at First Avenue onto 96th St.

EB to start at 1pm to 7pm from current 4pm to 7pm

Improvements in traffic operations at 96th St. and 97th St near FDR Drive Monitoring of construction zones via NYCDOT TMC at Long Island City

June 17th, 2008

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SLIDE 20

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69 th STREET & 72nd STREET SHAFTS

PHASE 1 PHASE 1 June 17th, 2008

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SLIDE 21

69th Street Work Shaft

4 Traffic Existing 20’ sidewalk curb line 4 Traffic Lanes sidewalk curb line Work Zone (Typical) Alternative Delivery Zone (Typical) (Typical)

6/18/2008 21

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SLIDE 22

72nd Street Work Shaft

4 Traffic Existing 20’ sidewalk curb line 4 Traffic Lanes sidewalk curb line Work Zone (Typical) Alternative Delivery Zone (Typical) yp (Typical)

6/18/2008 22

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SLIDE 23

69th & 72nd Street Construction Shafts

Shafts will be used by Shafts will be used by Contractors to excavate the station cavern & muck removal

6/18/2008 23

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SLIDE 24

SIDEWALK ENCROACHMENTS SIDEWALK ENCROACHMENTS

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SIDEWALK ENCROACHMENTS SIDEWALK ENCROACHMENTS

  • Vaults, Cellar doors, Utility vaults, etc
  • Sidewalk Cafes
  • Canopies and Awnings
  • Sidewalk retail areas
  • Public telephones, Bike racks etc
  • Steps, Ramps, Oil fill valves

June 17th, 2008

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SLIDE 25

Second Avenue Subway Second Avenue Subway Construction Progress Construction Progress Update (March to June) Update (March to June) Update (March to June) Update (March to June)

Presented by Presented by Presented by Presented by S3 Tunnel Constructors S3 Tunnel Constructors June 1 7 , 2 0 0 8 June 1 7 , 2 0 0 8

6/ 18/ 2008 6/ 18/ 2008 1 1

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SLIDE 26

Topics Covered Topics Covered

P d t (M h t J )

  • Progress update (March to June)
  • Secant Pile Walls
  • Slurry wall equipment and steps

Slurry wall equipment and steps

6/18/2008 6/18/2008 Page 2

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SLIDE 27

“Gas Trench” + splice boxes Gas Trench + splice boxes

Splice Box 2nd Avenue Looking North Gas Box Future 2nd Avenue Subway

6/18/2008 6/18/2008 Page 3

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SLIDE 28

Excavation for Gas Trench

View of March 2008

6/18/2008 6/18/2008 Page 4

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SLIDE 29

Install Sheeting for Gas Trench

View of April 2008 2008

6/18/2008 6/18/2008 Page 5

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SLIDE 30

Install Gas Pipe in Trench

View of May 2008

6/18/2008 6/18/2008 Page 6

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SLIDE 31

30” Gas Main Inside 42” Carrier Pipe

6/18/2008 6/18/2008 Page 7

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SLIDE 32

Place Splice Boxes For Deck Beams & Backfill

6/18/2008 6/18/2008 Page 8

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SLIDE 33

“Sew er Trench” + other utilities Sew er Trench + other utilities

Splice Box Sewer 2nd Avenue Looking North Gas Box Sewer Support Future 2nd Avenue Subway Support

6/18/2008 6/18/2008 Page 9

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SLIDE 34

Installed Mini Piles at 92 nd to 93 rd Str.

6/18/2008 6/18/2008 Page 10

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SLIDE 35

Construction of Drilled Shafts- 93 rd to 95 th Str.

6/18/2008 6/18/2008 Page 11

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SLIDE 36

Pour Concrete for Drilled Shafts

6/18/2008 6/18/2008 Page 12

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SLIDE 37

Construct Sew er in Trench

6/18/2008 6/18/2008 Page 13

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SLIDE 38

Secant Wall at selected location location

Splice Box Sewer Gas Box Sewer Support 2nd Avenue Looking North Secant Wall Support Future 2nd Avenue Subway

6/18/2008 6/18/2008 Page 14

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SLIDE 39

Topics Covered Topics Covered

P d t (M h t J )

  • Progress update (March to June)
  • Secant Pile Walls
  • Slurry wall equipment and steps

Slurry wall equipment and steps

6/18/2008 6/18/2008 Page 15

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SLIDE 40

Location for Secant w alls

SECANT WALL

Portions installed

6/18/2008

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SLIDE 41

Secant Pile Wall Construction- 91 st to 92 nd Str

6/18/2008 6/18/2008 Page 17

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Secant Pile Wall Construction- 91 st to 92 nd Str

6/18/2008 6/18/2008 Page 18

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SLIDE 43

Secant Pile Wall Construction- 91 st to 92 nd Str

6/18/2008 6/18/2008 Page 19

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SLIDE 44

Secant Pile Wall Construction- 91 st to 92 nd Str

6/18/2008 Page 20 6/18/2008

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SLIDE 45

Topics Covered Topics Covered

P d t (M h t J )

  • Progress update (March to June)
  • Secant Pile Walls
  • Slurry wall equipment and steps

6/18/2008 6/18/2008 Page 21

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SLIDE 46

Location for Slurry w alls y

SLURRY WALL

6/18/2008 6/18/2008 Page 22

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SLIDE 47

Slurry Walls Work

2nd Avenue Looking North Building Building Slurry Wall Future 2nd Avenue Subway

6/18/2008

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SLIDE 48

Slurry Wall Excavation

Stage1

in Steps

Primary Panel Excavation Clamshell Bucket

6/18/2008

Stage1

6/18/2008 Page 24

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SLIDE 49

Slurry Walls Reinforcement

Stage2 Reinforcement

Steel Installation

Reinforcement installation

6/18/2008

Stage2

6/18/2008 Page 25

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SLIDE 50

Slurry Walls

Stage3 Concreting

y Pour Concrete

Co c et g

6/18/2008

Stage3

6/18/2008 Page 26

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SLIDE 51

Slurry Plant Setup at 96 th Street Yard at 96 Street Yard

2nd Avenue

th Street h Street

Slurry Plant 97t 96th

6/18/2008 6/18/2008 Page 27

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SLIDE 52

Setup Slurry Wall Plant- 96 th Street Yard

6/18/2008 6/18/2008 Page 28

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Setup Slurry Wall Plant- 96 th Street Yard

6/18/2008 6/18/2008 Page 29

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Slurry Wall - Guide Wall Installation

6/18/2008 6/18/2008 Page 30

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SLIDE 55

Slurry Wall Machine During Wall Excavation

6/18/2008 6/18/2008 Page 31

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SLIDE 56

Reinforcing Steel Cage Lifting

6/18/2008 6/18/2008 Page 32

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SLIDE 57

T-Panel / Corner Panel Rebar Cage g Installation

6/18/2008 6/18/2008 Page 33

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SLIDE 58

Crane Safety and Inspections

All the cranes used on this project would go through the following inspection and Safety steps:

  • NY City Building Department Crane and Derricks (CD)

y g p ( ) Inspection and Certifications Prior to Arrival on Site.

  • NY City DOT Permits.

NY State Licensed Professional Engineer Conducts Stability

  • NY State Licensed Professional Engineer Conducts Stability,

Rigging, and Load Analysis

  • All Cranes will be Operated ONLY by NYC Licensed Operators

with type A Crane Operator’s License.

  • All Cranes will be Operated by Union Operators with 4 Years of

Training Program. g g

  • Daily Operators check of all crane systems and components.
  • MTA Overall Oversight

6/18/2008 Page 34 6/18/2008

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SLIDE 59

Excavation Betw een Slurry Walls Under Deck Panels

6/18/2008 6/18/2008 Page 35