Background History of the Clayton Street Bridge First - - PowerPoint PPT Presentation

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Background History of the Clayton Street Bridge First - - PowerPoint PPT Presentation

Nov 01, 2022 285 likes •641 views

A CCELERATED B RIDGE C ONSTRUCTION THE C LAYTON S TREET B RIDGE R EPLACEMENT ASCE & SEAM January 15, 2015 Malek Al-Khatib, P.E., Vice President , Project Manager | Louis Berger Background History of the Clayton Street Bridge First

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SLIDE 1

ACCELERATED BRIDGE CONSTRUCTION

THE CLAYTON STREET BRIDGE

REPLACEMENT

Malek Al-Khatib, P.E.,

Vice President , Project Manager | Louis Berger

ASCE & SEAM

January 15, 2015

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SLIDE 2

Background

History of the Clayton Street Bridge

  • First Massachusetts Bay Transportation Authority (MBTA)

transit bridge built using Accelerated Bridge Construction (ABC) methods

  • Built in 1911 and modified in 1926
  • Deteriorated three-span steel structure with steel bents
  • Replaced in 2013 with a single-span steel structure, thus
  • pening up the street and the sidewalks below
  • Design completed September 2012
  • New structure erected November 2013
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SLIDE 3
  • Located in the Dorchester

neighborhood of Boston, Massachusetts

  • Mix of residential industrial

neighborhoods

  • Part of the MBTA Ashmont

Red Line

  • Frequent truck route

Location Map

Dorchester, Massachusetts

Clayton St. Bridge

Quick Facts

Field Corner Station Braintree Branch

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SLIDE 4
  • Steel elements showed

signs of deterioration

  • Original 13’-10”

clearance was not sufficient for current truck traffic

  • Steel bents blocking the

roadway caused hazards for motorists and

  • bstructed sidewalks for

pedestrians

Old Structure

Condition

steel bents Through Girder Deck Structure

  • bstructed sidewalks

13’-10” clearance

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SLIDE 5

Challenges

Structure

  • Low Clearance
  • Truck collision damage

proved that low clearance was an ongoing issue that had to be fixed

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SLIDE 6

Community and MBTA Red Line Operation

  • Residential abutters cross the street from the bridge
  • MBTA Red Line trains could not be shut down on

weekdays

  • Limited number of possible Red Line weekend

shutdowns

  • Coordination with other MBTA construction projects

Notice for public information meeting

Challenges

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SLIDE 7

Challenges

Structure 500 ft. radius track curve

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SLIDE 8

Challenges

Structure 50 degree bridge skew angle

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SLIDE 9

Challenges

Structure

  • Converting 3 span

structure to a single span

  • Existing abutments

couldn’t sustain the load increase

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SLIDE 10

Challenges

Structure

  • Framing Configuration
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SLIDE 11

Challenges

MBTA System

  • Traction power lines run

through the bridge

  • Third rail and heater cables

run through the bridge and were in poor condition

  • Signal and communication

system was outdated and not well plotted

  • Rail sprinkler system runs

through the bridge and was in poor condition

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SLIDE 12

Challenges

MBTA System

  • Conduct testing and

tagging of signal and communication cable.

  • Replace antiquated signal

system and reducing the number of conductor cables from 500 to around 80

  • Replace several manholes

and junction boxes.

  • Cannot combine power and

signal cable conduits

  • Maintain MBTA System
  • perational.

Rendering for temporary bridge

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SLIDE 13

Construction Site Constraints

  • Limited ROW
  • Heavy traffic on Clayton Street

during rush hours

  • City ordinance regarding noise and

work hours

  • Limited number of possible streets

shutdowns

  • Coordination with the utility

companies

Challenges

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SLIDE 14
  • Clayton Street Bridge

clearance is the highest in the area.

  • Narrow residential one way

streets

  • Main streets are congested

weekdays.

Challenges

Traffic Management Plan (Clayton Closed & Dickens Closed

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SLIDE 15

Weekend Hourly Schedule

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SLIDE 16

Temporary Bridge

Used to re-route MBTA systems off bridge during construction

  • Temporary bridge built in

Spring 2013 to re-route cables off existing structure

  • Minimized interference

with train service during construction

  • (Left) temporary bridge

completed with utility ducts re-routing utilities

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SLIDE 17

System Work

System work without interrupting service

  • Systems were

replaced, re-routed and/or upgraded

  • New manholes were

installed

  • New cables and

junction boxes improved service

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SLIDE 18

Strengthening Existing Abutments

40ft deep minipiles

85ft long tieback soil anchors

Installation of tiebacks and mini piles

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SLIDE 19

Strengthening Existing Abutments

40ft deep minipiles

85ft long tieback soil anchors

Installation of tiebacks and mini piles

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SLIDE 20

Strengthening Existing Abutments

Proposed Bridge

Existing Bridge

Installation of tiebacks and mini piles

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SLIDE 21

Strengthening Existing Abutments

Installation of Tiebacks

  • 85-foot-long tiebacks

installed at design angle while avoiding existing steel bents

  • Installed during two

weekend street shutdowns while trains were operational over the bridge

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SLIDE 22

Installation of Mini Piles

  • 40-foot-long mini piles

cored through top of existing abutment

  • Installed during three

weekend Red Line shutdowns while keeping the streets

  • pen below

Strengthening Existing Abutments

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SLIDE 23

New Bridge

Constructed on site

  • New superstructure was

pre-assembled in the shop

  • New superstructure

arrived in five panels and was fully assembled onsite

  • New superstructure was

assembled in yard adjacent to existing structure

  • New structure was erected
  • n scaffolding
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SLIDE 24

SPMT Units – ABC Construction

Self Propelled Modular Transit Units

  • Two SPMT Units were used to transport bridge
  • SPMT Units moved simultaneously and were controlled

by one operator

  • Tires of SPMT Unit had 360º rotation capabilities for

ease of mobility and precision when placing new structure on bearings

  • Steel plates were placed along the path of the SPMT to

ensure proper load bearing capacity

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SLIDE 25

Veteran’s Day Weekend

  • Friday Nov. 8, 2013:

Demolition; preparation began after last train

  • Saturday Nov. 9, 2013 at

noon: Clayton Street was cleared of debris

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SLIDE 26

Veteran’s Day Weekend

Preparing the Substructure

  • Saturday 10 p.m.: Bearings and backwalls were

installed

  • Existing backwalls were sawn off and cleaned along

with the existing bridge seats

  • New backwalls were installed
  • Lesson learned: Place down new bridge prior to

installing backwalls

  • New bearings were installed and locations were

confirmed by surveyor

  • Lesson learned: Ensure bearings and bearing

plates are level prior to placing down bridge

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SLIDE 27

Veteran’s Day Weekend

Moving the Superstructure

  • Saturday 5:30 p.m.: Bridge started to move
  • SPMT Units lifted the bridge off the scaffolding at 5:30 p.m. on

November 9th

  • Media and residents gathered to watch the 500,000lb structure

slowly roll into place

  • Saturday 10:30 p.m.: Substructure modifications were

completed, and the bridge began moving to its final position, and lowered on the new bearings.

  • Bridge was successfully placed on the bearings and the track

and ballast were replaced

  • Sunday Nov. 10, 2013: bridge was completed.
  • Monday 12:05: Track work completed for Monday morning

service

  • Service resumed for Monday morning commuters on schedule
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SLIDE 28

ABC Planning/Design/Construction

Basic Elements

  • Detailed planning, design, and constructability reviews.
  • Proposed means and methods included in the bid

documents.

  • Attention to all details that affect schedule.
  • Risk assessment and minimize unforeseen conditions.
  • Detailed construction scheduling during the design phase,

including hourly schedules and assignment of responsibilities, were necessary for success of weekend installation

  • Detailed scheduling and dry-runs with the contractor to

ensure smooth delivery

  • Collaboration and open communication between owner,

contractor and designer ensured a smooth weekend

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SLIDE 29

ABC Planning/Design/Construction

Benefits of Accelerated Bridge Construction

  • By conventional techniques, the replacement would

have taken an additional 10 months and $2 million to complete

  • Conventional methods would have resulted in several

weeks of Red Line and street closure

  • Community engagement drove the project schedule

and ultimate success

  • Due to proper preparation, work that was initially

scheduled for a 3-day weekend was successfully completed in a 2-day weekend with no injuries or accidents

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SLIDE 30

Replacement Sequence 3D Animation

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SLIDE 31
  • The bridge was painted

a light grey color to match surroundings

  • Formliner was added

to the face of the abutment walls

  • New sidewalks were

constructed and the roadway was paved and cleared

  • New street lighting

under the bridge

Finishing Touches

formliner sidewalks 14’-0” clearance lightings

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SLIDE 32

Before & After

  • Clearance was increased from 13’-10” to 14’-0”
  • Sidewalks were widened
  • Steel bents were removed
  • Bird netting was installed to protect bridge seats
  • Formliner was added for esthetics
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SLIDE 33
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SLIDE 34

Planning, attention to details, and partnering = Success