Excavation Bracing

1. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 Nashville WWTP 1993 ProgramNashville WWTP 1993 Program
 MA Mortenson, Prime ContractorMA Mortenson, Prime Contractor
► Scope of work included theScope of work included the
installation of 80K Tiebacks alonginstallation of 80K Tiebacks along
existing Soldier Pile and laggingexisting Soldier Pile and lagging
wall installed by the primewall installed by the prime
contractor.contractor.
► First installation occurred fall/winterFirst installation occurred fall/winter
1992 and was completed within 31992 and was completed within 3
weeksweeks
► Used 8” augured double groutedUsed 8” augured double grouted
tiebacks with 1” grade 160 Williamstiebacks with 1” grade 160 Williams
rods.rods.
► Used Prefabricated double channelUsed Prefabricated double channel
walerswalers
► Program expanded due to changedProgram expanded due to changed
excavation limits and additionalexcavation limits and additional
Tiebacks /cap waler was placedTiebacks /cap waler was placed
along an extended sheet pile wale.along an extended sheet pile wale.


2. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 University of TennesseeUniversity of Tennessee
 Pedestrian /Steam Service TunnelPedestrian /Steam Service Tunnel
 Grinder Brothers, Prime ContractorGrinder Brothers, Prime Contractor
► Scope of work includes Excavation , excavationScope of work includes Excavation , excavation
bracing , compaction of subgrade , and placementbracing , compaction of subgrade , and placement
of seal slabs for urban site.of seal slabs for urban site.
► Site conditions required reduced size equipmentSite conditions required reduced size equipment
for access, flexible design to work around olderfor access, flexible design to work around older
abandoned work from 1972 classroomabandoned work from 1972 classroom
construction, and phased street crossing toconstruction, and phased street crossing to
maintain flow along a major street.maintain flow along a major street.
► Work placed in three phasesWork placed in three phases
 Phase One included excavation and bracedPhase One included excavation and braced
support of new north entry plaza to tunnelsupport of new north entry plaza to tunnel
system . Tangent soldier piles with internallysystem . Tangent soldier piles with internally
braced concrete capbraced concrete cap
 Phase Two included the excavation andPhase Two included the excavation and
braced support of off-street portion of steambraced support of off-street portion of steam
tunnel and south utility rooms. Work progresstunnel and south utility rooms. Work progress
south narrow alley with hostile property ownerssouth narrow alley with hostile property owners
on south perimeter. Tangent Cantilever soldieron south perimeter. Tangent Cantilever soldier
piles used as no opportunity to brace waspiles used as no opportunity to brace was
available either internally or tiebacks.available either internally or tiebacks.
 Phase Three required the closure of tunnels toPhase Three required the closure of tunnels to
entry plaza under a major street with significantentry plaza under a major street with significant
utility conflicts. Bracing was accomplished byutility conflicts. Bracing was accomplished by
use of Soldier piles and lagging with internaluse of Soldier piles and lagging with internal
pipe strut support. Four major utilities crossingpipe strut support. Four major utilities crossing
required support with needle beams andrequired support with needle beams and
girders supported by pile foundations.girders supported by pile foundations.
 Final Work included the demolition/removal ofFinal Work included the demolition/removal of
all systems a minimum of 3’ below grade.all systems a minimum of 3’ below grade.

3. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 University of TennesseeUniversity of Tennessee
 Pedestrian /Steam Service TunnelPedestrian /Steam Service Tunnel
 Grinder Brothers, Prime ContractorGrinder Brothers, Prime Contractor

4. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 Memphis Packing CompanyMemphis Packing Company
 Mayer Construction CompanyMayer Construction Company
 Scope Of Work included Drilled Shafts to support super-Scope Of Work included Drilled Shafts to support super-
structure and excavation /bracing of 30’ deep wetwell forstructure and excavation /bracing of 30’ deep wetwell for
plant sludge recovery.plant sludge recovery.
 Used tangent wall system with “bar Joist Reinforcement .Used tangent wall system with “bar Joist Reinforcement .
Under reamed piers were placed within ht tangent wallUnder reamed piers were placed within ht tangent wall
system.system.
 System was internally braced by ring beam construction.System was internally braced by ring beam construction.
 Excavation was preformed using drilled shaft equipmentExcavation was preformed using drilled shaft equipment
and final grade trimmed and cleanup mini 30HP mini-and final grade trimmed and cleanup mini 30HP mini-
excavator and skip buckets.excavator and skip buckets.
 Minimal Dewatering system was installed in bridgingMinimal Dewatering system was installed in bridging
stone base and abandoned in placestone base and abandoned in place

5. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 City of MemphisCity of Memphis
 Cypress Creek Pump StationCypress Creek Pump Station
 G D Moore Construction Co. PrimeG D Moore Construction Co. Prime
ContractorContractor
 Scope Of Work included Drilled /H-Pile and Lagging earthScope Of Work included Drilled /H-Pile and Lagging earth
support for excavation of new Sewage Pump Station,support for excavation of new Sewage Pump Station,
Structural Excavation and Backfill of lift stationStructural Excavation and Backfill of lift station
construction.construction.
 Used Steel Wide Flange Beams installed in 24” DrilledUsed Steel Wide Flange Beams installed in 24” Drilled
shafts with Filter media backfill to allow for drainage ofshafts with Filter media backfill to allow for drainage of
overlaying strata.overlaying strata.
 System was internally braced using struts and cornerSystem was internally braced using struts and corner
braces. Braces were removed after placement of concretebraces. Braces were removed after placement of concrete
chambers to allow for clear placement of packaged pumpchambers to allow for clear placement of packaged pump
station..station..
 Excavation was preformed using combination of 2 cy trackExcavation was preformed using combination of 2 cy track
hoe and mini-Excavator to work lagging placement.hoe and mini-Excavator to work lagging placement.
 All Bracing extracted at completion to preventAll Bracing extracted at completion to prevent
interferences for incoming and outgoing deep sewers.interferences for incoming and outgoing deep sewers.
 Dewatering system was installed using Reverse rotaryDewatering system was installed using Reverse rotary
drilling and 8” PVC casing and Screen.drilling and 8” PVC casing and Screen.
 4 Similar Projects Completed reusing most of the4 Similar Projects Completed reusing most of the
extracted Bracing/lagging to gain economy/extracted Bracing/lagging to gain economy/

6. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 A O Smith- Milan TennesseeA O Smith- Milan Tennessee
 New Press Line FoundationsNew Press Line Foundations
 Rentenbach Constructors Co. PrimeRentenbach Constructors Co. Prime
ContractorContractor
 Scope Of Work included installation of tangent soldierScope Of Work included installation of tangent soldier
piles and excavation of press pit.piles and excavation of press pit.
 Work complete inside of an operating stamping mill.Work complete inside of an operating stamping mill.
 Excavation Bracing designed to withstand shocks fromExcavation Bracing designed to withstand shocks from
adjacent stamping mills with minimal ground movement.adjacent stamping mills with minimal ground movement.
 All work completed within 25’ headroom and required aAll work completed within 25’ headroom and required a
stubby crane boom attachment.stubby crane boom attachment.
 Crane attachment used for work required a modifiedCrane attachment used for work required a modified
bridge as well as special short augers during the work.bridge as well as special short augers during the work.
 Bracing Installation . Supports , and struts installed withinBracing Installation . Supports , and struts installed within
2 weeks, Remaining work completed and billed within 452 weeks, Remaining work completed and billed within 45
days keeping to aggressive construction turnarounddays keeping to aggressive construction turnaround
schedule demanded by client.schedule demanded by client.

7. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 Consolidated FreightwaysConsolidated Freightways
Memphis, TennesseeMemphis, Tennessee
 Retaining Wall ReplacementRetaining Wall Replacement
 R. C. Crawford, Inc. /H and MR. C. Crawford, Inc. /H and M
Construction Prime ContractorsConstruction Prime Contractors
 Scope Of Work included removal of existing stackedScope Of Work included removal of existing stacked
timber wall , re-grading of site to allow for install of steeltimber wall , re-grading of site to allow for install of steel
framed support.framed support.
 Once framework was installed a reconstructed TimberOnce framework was installed a reconstructed Timber
wall face was placed at original lines and grades.wall face was placed at original lines and grades.
 Additional back of wall drainage system was installed toAdditional back of wall drainage system was installed to
enhance the collection of Leachatte from adjacent landfill.enhance the collection of Leachatte from adjacent landfill.
 All steel prepped by hot galvanized process and repaintedAll steel prepped by hot galvanized process and repainted
in the field to cover welds and bolt punching with epoxyin the field to cover welds and bolt punching with epoxy
paint.paint.
 Selected Areas of wall backfill required the use of No-Selected Areas of wall backfill required the use of No-
Fines Concrete to allow for the excessive leachatte runoff.Fines Concrete to allow for the excessive leachatte runoff.
 Steel frame work supported by embedded H-pile inSteel frame work supported by embedded H-pile in
concrete drilled shafts.concrete drilled shafts.
 Design of all work supervised by owners Engineer ofDesign of all work supervised by owners Engineer of
Record.Record.

8. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 Bunge CorporationBunge Corporation
 Port Improvements St. CharlesPort Improvements St. Charles
ArkansasArkansas
► Scope of work includes Excavation ,Scope of work includes Excavation ,
permanent tied back H-pile Retaining wallpermanent tied back H-pile Retaining wall
and slope restoration for new grain silosand slope restoration for new grain silos
and loading facilities on the St Francisand loading facilities on the St Francis
RiverRiver
► Site conditions required that installationsSite conditions required that installations
be worked around and existing loadingbe worked around and existing loading
bridge and silos.bridge and silos.
► Scope of work included 40’ H-PilesScope of work included 40’ H-Piles
Installed in Drilled Shafts to avoidInstalled in Drilled Shafts to avoid
vibrations.vibrations.
► Bracing consisted of 60K working loadBracing consisted of 60K working load
tiebacks up to 55’ deep. Permanenttiebacks up to 55’ deep. Permanent
corrosion protection provided by use ofcorrosion protection provided by use of
coal tar epoxy and re-grout of tendons. (2coal tar epoxy and re-grout of tendons. (2
level)level)
► Lagging consisted of new 7x9 oakLagging consisted of new 7x9 oak
creosote timbers.creosote timbers.
► Design of project by othersDesign of project by others

9. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 Taylor Forge- Gulf And WesternTaylor Forge- Gulf And Western
 Re-tooling Plant to Pipe FlangeRe-tooling Plant to Pipe Flange
ProductionProduction
► Scope of work includesScope of work includes
Demolition/Excavation , excavationDemolition/Excavation , excavation
bracing, and pile foundations for newbracing, and pile foundations for new
press pits and rolling mills as part of re-press pits and rolling mills as part of re-
tooling of a plant.tooling of a plant.
► Site conditions required that installationsSite conditions required that installations
be coordinated around the final productionbe coordinated around the final production
runs of existing mill and required that siteruns of existing mill and required that site
be dewatered to lower water tablebe dewatered to lower water table
approximately 16’ to allow for dryapproximately 16’ to allow for dry
placement of structures.placement of structures.
► Excavation tracing required special designExcavation tracing required special design
to work around massive press pits toto work around massive press pits to
remain in place as well as support ofremain in place as well as support of
building/crane columns for ring rollingbuilding/crane columns for ring rolling
mill..mill..
► Other miscellaneous foundations installedOther miscellaneous foundations installed
included Bliss Press, 4000 T Press,included Bliss Press, 4000 T Press,
Pretreatment heaters, and miscellaneousPretreatment heaters, and miscellaneous
material handlers.material handlers.

10. Other Excavation Bracing/Specialty Excavation ProjectsOther Excavation Bracing/Specialty Excavation Projects
R.C. Crawford, IncR.C. Crawford, Inc
 Taylor Forge- Gulf And WesternTaylor Forge- Gulf And Western
 Re-tooling Plant to Pipe FlangeRe-tooling Plant to Pipe Flange
ProductionProduction
► Scope of work includesScope of work includes
Demolition/Excavation , excavationDemolition/Excavation , excavation
bracing, and pile foundations for newbracing, and pile foundations for new
press pits and rolling mills as part of re-press pits and rolling mills as part of re-
tooling of a plant.tooling of a plant.
► Site conditions required that installationsSite conditions required that installations
be coordinated around the final productionbe coordinated around the final production
runs of existing mill and required that siteruns of existing mill and required that site
be dewatered to lower water tablebe dewatered to lower water table
approximately 16’ to allow for dryapproximately 16’ to allow for dry
placement of structures.placement of structures.
► Excavation tracing required special designExcavation tracing required special design
to work around massive press pits toto work around massive press pits to
remain in place as well as support ofremain in place as well as support of
building/crane columns for ring rollingbuilding/crane columns for ring rolling
mill..mill..
► Other miscellaneous foundations installedOther miscellaneous foundations installed
included Bliss Press, 4000 T Press,included Bliss Press, 4000 T Press,
Pretreatment heaters, and miscellaneousPretreatment heaters, and miscellaneous
material handlers.material handlers.