Sfobb Dec08

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Education

Published on February 9, 2009

Author: ascedallas

Source: slideshare.net

Description

New San Francisco - Oakland Bay Bridge Surveying Presentation

The Survey for the New San Francisco Oakland Bay Bridge December 1 st , 2008 ASCE Dallas Branch Meeting

Presentation Topics An Introduction to the Project Key Bridge Components Geodetic Surveying and Tectonic Considerations Transition Span OBG’s Footings (T1 & E2) SAS Tower SAS OBG’s

An Introduction to the Project

Key Bridge Components

Geodetic Surveying and Tectonic Considerations

Transition Span OBG’s

Footings (T1 & E2)

SAS Tower

SAS OBG’s

Project Limits San Francisco Oakland Treasure Island Yerba Buena Island

Introduction The New Bridge Designed by Ty Lin and Moffett Nichol JV Constructors - American Bridge/Flour JV

The New Bridge

Designed by Ty Lin and Moffett Nichol JV

Constructors - American Bridge/Flour JV

SAS Components

Surveying Challenges Unique single tower design requires extreme survey accuracy Complex OBG Deck Geometry (e.g., pre-camber) Primary geodetic control network (Order B) Steel component fabrication tolerances (1 mm  3 mm depending on specific dimensional criteria) Thus survey accuracies must be 5 x to 10 x better than the tolerances

Unique single tower design requires extreme survey accuracy

Complex OBG Deck Geometry (e.g., pre-camber)

Primary geodetic control network (Order B)

Steel component fabrication tolerances (1 mm  3 mm depending on specific dimensional criteria)

Thus survey accuracies must be 5 x to 10 x better than the tolerances

Project Area sits on a single tectonic plate No discernable scale or rotation seen in the HTDP output Presented Results to Client Primary Geodetic Control and Related Issues, e.g., Tectonic Motion

Project Area sits on a single tectonic plate

No discernable scale or rotation seen in the HTDP output

Presented Results to Client

Transition Span Survey For Caltrans USA Steel Fabrication Verification - Portland Transition Spans First Survey Attempt by Others Failed Original Fabricator went out of Business

USA Steel Fabrication Verification - Portland

Transition Spans

First Survey Attempt by Others Failed

Original Fabricator went out of Business

Conventional Precision Survey Methods

Conventional Network 95% confidence regions exceed project tolerance (3 mm)

State of the Art Technology Laser Tracker

Laser Tracker

Primary Control Applied Technology Precision prisms Drift nest tools Circle tools Edge tools Hidden point tools Etc.

Applied Technology

Precision prisms

Drift nest tools

Circle tools

Edge tools

Hidden point tools

Etc.

Leica Laser Tracker and 1.5″ Precise Sphere

Laser Tracker Survey of the Transition Span OBG’s

T1 Footing Survey – Corpus Christi Five Elements Dimensions Pile Sleeve Radii and Orientation Dowel Locations Location and Axis of 438 Bolt Holes Dowel and Bolt Hole Template

Five Elements

Dimensions

Pile Sleeve Radii and Orientation

Dowel Locations

Location and Axis of 438 Bolt Holes

Dowel and Bolt Hole Template

Pile Sleeve Analysis

T1 Footing Pile Sleeve Alignment and Key Dimensions

T1 Footing Organized Chaos

 

 

 

 

 

 

T1 Footing Survey – Corpus Christi Use a Laser Tracker Work at Night Minimize ambient conditions flux Easier access with minimal other work Network based on 63 surveyed dowel locations

Use a Laser Tracker

Work at Night

Minimize ambient conditions flux

Easier access with minimal other work

Network based on 63 surveyed dowel locations

Dowel Survey Results

Template Survey Results

T1 Footing at KOS

T1 Footing Delivery

Driving the Piles

T1 Footing in Place

T1 Footing Installed

ZPMC Fabrication Facility Shanghai

ZPMC

Tower Survey - China Tower Fabrication Getting Oriented (no pun intended)

Getting Oriented (no pun intended)

The Basic Tower Design

Tower Mock-up Surveys China Tower/Deck Fabrication – First Survey The Project Site Steel Fabricator in Shanghai Mock up Survey 3 Elevations of the Tower To Prove Capability Actual Sections 40 M Survey for Dimensions Flatness Orthogonality Torsion Alignment

China Tower/Deck Fabrication – First Survey

The Project Site

Steel Fabricator in Shanghai

Mock up Survey

3 Elevations of the Tower

To Prove Capability

Actual Sections 40 M

Survey for

Dimensions

Flatness

Orthogonality

Torsion

Alignment

Tower Survey China Tower Fabrication Survey Using Laser Tracker

China Tower Fabrication

Survey Using Laser Tracker

Tower Shaft Survey China Tower Fabrication Performing the Survey

China Tower Fabrication

Performing the Survey

Tower Shaft Survey China Tower Fabrication Performing the Survey

China Tower Fabrication

Performing the Survey

Control Network and Object Observations Network Design Point Cloud Maximum Residual found was 0.023mm (0.0009’)

Network Design

Point Cloud

Maximum Residual found was 0.023mm (0.0009’)

Survey Report (Shaft Dimensions)

Survey Report (Shaft Skin Analysis) Results Flatness CI = 0.5 mm (1/50 th inch)

Results

Flatness

CI = 0.5 mm

(1/50 th inch)

Survey Report (Stiffener Locations and Orthogonality)

Survey Report (Shaft Torsion Analysis)

Alignment at Shaft Splice

OBG Jig Survey Use of jigs to maintain OBG fabrication geometry

Use of jigs to maintain OBG fabrication geometry

Jig Under Construction

OBG Survey

Ice Cream Break

Shanghai Surveys Towill Engineer with Buddy from Shanghai Hash House Harriers

Towill Engineer with Buddy from Shanghai Hash House Harriers

Thank You

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