Blalock Construction Company was contracted by the North Carolina DOT from 1990 to 1993 to complete multiple highway repair projects requiring soldier pile and anchor installations in varying soil and rock conditions. The anchors encountered different rock types and various installation techniques were used. Despite installing over 1000 anchors with no failures, the project resulted in claims against the NC DOT due to misrepresented site conditions in procurement documents. Final settlements were reached in 1996 after the designing engineering firm closed.

1. Case HistoryCase History
Slide repairsSlide repairs
North Carolina DOTNorth Carolina DOT
Blalock Construction Company Prime ContractorBlalock Construction Company Prime Contractor
► Multiple Sights of federal Highway repairs contracted from 1990 to 1993Multiple Sights of federal Highway repairs contracted from 1990 to 1993
► Required the installation of Soldier piles in varying materials from earth to shotRequired 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 granitesRock 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 ConfigurationAll Work Designed by DOT with Material Selections and Anchor Configuration
by R. C. Crawford, Inc. Specifications required Triple Corrosion Protections andby R. C. Crawford, Inc. Specifications required Triple Corrosion Protections and
provided for limits on elongation and creep . Typical designed anchor providedprovided 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 testingfor 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 localDue 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 NCWork 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.

2. Completed ProjectsCompleted Projects
R.C. Crawford, IncR.C. Crawford, Inc
North CarolinaNorth Carolina
Slide RepairsSlide Repairs
Soldier Pile InstallationSoldier Pile Installation

3. Completed ProjectsCompleted Projects
R.C. Crawford, IncR.C. Crawford, Inc
North CarolinaNorth Carolina
Slide RepairsSlide Repairs
Soldier Pile InstallationSoldier Pile Installation

4. Completed ProjectsCompleted Projects
R.C. Crawford, IncR.C. Crawford, Inc
North CarolinaNorth Carolina
Slide RepairsSlide Repairs
Anchor installation (earth)Anchor installation (earth)

5. Completed ProjectsCompleted Projects
R.C. Crawford, IncR.C. Crawford, Inc
North CarolinaNorth Carolina
Slide RepairsSlide Repairs
Anchor installation (earth)Anchor installation (earth)

6. Completed ProjectsCompleted Projects
R.C. Crawford, IncR.C. Crawford, Inc
North CarolinaNorth Carolina
Slide RepairsSlide Repairs
TestingTesting

7. Completed ProjectsCompleted Projects
R.C. Crawford, IncR.C. Crawford, Inc
North CarolinaNorth Carolina
Slide RepairsSlide Repairs
Completed WallCompleted Wall