Case History Ncdot
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Case History Case History Slide repairs Slide repairs North Carolina DOT North Carolina DOT Blalock Construction Company Prime Contractor Blalock Construction Company Prime Contractor ► Multiple Sights of federal Highway repairs contracted from 1990 to 1993 Multiple Sights of federal Highway repairs contracted from 1990 to 1993 ► Required the installation of Soldier piles in varying materials from earth to shot Required the installation of Soldier piles in varying materials from earth to shot rock fills with minimum of 5; rock sockets in competent rock. rock fills with minimum of 5; rock sockets in competent rock. ► Rock Sockets varied in materials from shale and dolomite limestone to granites Rock Sockets varied in materials from shale and dolomite limestone to granites and required a variety of techniques using earth augers, rock augers, coring, and required a variety of techniques using earth augers, rock augers, coring, and ultimately large down-the-hole hammer-cluster drills. and ultimately large down-the-hole hammer-cluster drills. ► All Work Designed by DOT with Material Selections and Anchor Configuration All Work Designed by DOT with Material Selections and Anchor Configuration by R. C. Crawford, Inc. Specifications required Triple Corrosion Protections and by R. C. Crawford, Inc. Specifications required Triple Corrosion Protections and provided for limits on elongation and creep . Typical designed anchor provided provided for limits on elongation and creep . Typical designed anchor provided for up to 2.5 inch elongation with no more than 2% creep. 100% proof testing for up to 2.5 inch elongation with no more than 2% creep. 100% proof testing and 10% performance. No Anchors failed in the over 1000 installed. and 10% performance. No Anchors failed in the over 1000 installed. ► Due to changing sight conditions many of the anchors were subbed out to local Due to changing sight conditions many of the anchors were subbed out to local rock drillers. rock drillers. ► Work Resulted in large claims due to misrepresentation of conditions by NC Work Resulted in large claims due to misrepresentation of conditions by NC DOT in the procurement documents. Final settlements occurred 1996 after R. DOT in the procurement documents. Final settlements occurred 1996 after R. C. Crawford closed. C. Crawford closed.
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Transcript of Case History Ncdot
Case HistoryCase HistorySlide repairs Slide repairs
North Carolina DOTNorth Carolina DOTBlalock Construction Company Prime ContractorBlalock Construction Company Prime Contractor
► Multiple Sights of federal Highway repairs contracted from 1990 to 1993 Multiple Sights of federal Highway repairs contracted from 1990 to 1993 ► Required the installation of Soldier piles in varying materials from earth to shot Required the installation of Soldier piles in varying materials from earth to shot
rock fills with minimum of 5; rock sockets in competent rock.rock fills with minimum of 5; rock sockets in competent rock.► Rock Sockets varied in materials from shale and dolomite limestone to granites Rock Sockets varied in materials from shale and dolomite limestone to granites
and required a variety of techniques using earth augers, rock augers, coring, and required a variety of techniques using earth augers, rock augers, coring, and ultimately large down-the-hole hammer-cluster drills.and ultimately large down-the-hole hammer-cluster drills.
► All Work Designed by DOT with Material Selections and Anchor Configuration All Work Designed by DOT with Material Selections and Anchor Configuration by R. C. Crawford, Inc. Specifications required Triple Corrosion Protections and by R. C. Crawford, Inc. Specifications required Triple Corrosion Protections and provided for limits on elongation and creep . Typical designed anchor provided provided for limits on elongation and creep . Typical designed anchor provided for up to 2.5 inch elongation with no more than 2% creep. 100% proof testing for up to 2.5 inch elongation with no more than 2% creep. 100% proof testing and 10% performance. No Anchors failed in the over 1000 installed.and 10% performance. No Anchors failed in the over 1000 installed.
► Due to changing sight conditions many of the anchors were subbed out to local Due to changing sight conditions many of the anchors were subbed out to local rock drillers.rock drillers.
► Work Resulted in large claims due to misrepresentation of conditions by NC Work Resulted in large claims due to misrepresentation of conditions by NC DOT in the procurement documents. Final settlements occurred 1996 after R. DOT in the procurement documents. Final settlements occurred 1996 after R. C. Crawford closed.C. Crawford closed.
Completed ProjectsCompleted ProjectsR.C. Crawford, IncR.C. Crawford, Inc
North Carolina North Carolina Slide Repairs Slide Repairs
Soldier Pile InstallationSoldier Pile Installation
Completed ProjectsCompleted ProjectsR.C. Crawford, IncR.C. Crawford, Inc
North Carolina North Carolina Slide Repairs Slide Repairs
Soldier Pile InstallationSoldier Pile Installation
Completed ProjectsCompleted ProjectsR.C. Crawford, IncR.C. Crawford, Inc
North Carolina North Carolina Slide Repairs Slide Repairs
Anchor installation (earth)Anchor installation (earth)
Completed ProjectsCompleted ProjectsR.C. Crawford, IncR.C. Crawford, Inc
North Carolina North Carolina Slide Repairs Slide Repairs
Anchor installation (earth)Anchor installation (earth)
Completed ProjectsCompleted ProjectsR.C. Crawford, IncR.C. Crawford, Inc
North Carolina North Carolina Slide Repairs Slide Repairs
TestingTesting
Completed ProjectsCompleted ProjectsR.C. Crawford, IncR.C. Crawford, Inc
North Carolina North Carolina Slide Repairs Slide Repairs
Completed WallCompleted Wall
