Objectives - UTA

1 Objectives Introduction Open-cut Installation Horizontal Directional Drilling Installation Advantages of HDD vs. Open-cut Social Cost Project Description Cost Comparison Cost Summary Conclusion Cost comparison of: Horizontal Directional Drilling (HDD) with traditional open-cut. Actual HDD projects carried with theoretical open-cut costs. Summarizing the cost comparison results based on Contractor s Bidand RS Means Cost Data 2010. The cost effective construction of a pipeline project requires a clear understanding of all cost factors associated with the specific project of a Project The costs of new installation of water pipes depend on many factors like the: Project Size Length Depth Location Surface and Subsurface Conditions Type of Application, etc Work items: Pipe transportation, handling, and storage.

2 Trench excavation. Foundation, bedding and placing, and joining of pipe. Embedment, backfill, and compaction of the ,backfillingandresurfacingcanaccounttoas highas70%ofthetotalprojectcost(Najafi,20 05) Method of installing underground pipes and conduits along a prescribed bore path from the surface Minimal impact to the surrounding area. TaskMini RigsMidiRigsMaxi RigsMobilization and Set up< 6 hrs1 3 days3 10 daysPilot Hole Drilling100 400 ft/hr60 300 ft/hr20 180 ft/hrPre-reaming/Reaming (Per Pass)100 300 ft/hr60 240 ft/hr20 180 ft/hrProduct Pullback 200 600 ft/hr200 600 ft/hr150 450 ft/hrCleanup and Demobilization2 4 hrs4 hrs to 2 days2 7 daysTrenchless Technologyvs. Open-Cut MethodSocial 5%Indirect /overhead 20%Labor 40%Material 35%Trenchless CostsSocial 40%Labor 30%Materials 10%Indirect /overhead 20%Open-cut CostsNajafi & Gokhale, 2005 ParametersOpen-cut InstallationHorizontal Directional Drilling InstallationInstallation costs Installation can be expensive in urban areasCost effective method in urban areasSocial costsHighcost for noise, safety, damage to nearby structures and utilities, health &business loss Less noise, minimum health risk, no obstruction to businessIndirect costsTraffic control, job site cost is highMinimum excavation, less traffic congestion, and minimum equipmentRestoration costsHigh restoration costReduce clean-up and restoration costLabor costsHigh labor cost for excavation and backfillingLess costly.

3 Minimum labor forceEquipment CostsIncludes excavator and truckIncludes drilling rig and excavatorRate of Production (Duration)Low (takes more time)High (takes less time)Case Study 1 Eastland TexasLocationEastland, TexasDate of InstallationMarch 10, 2010 ContractorDarnell and Dickson Construction SubcontractorCollier Directional DrillingLength of Installation318 ftNominal Diameter of the Pipe6 in. Dimension Ratio (DR)18 Depth from Ground to Center of the Pipe4 ft Crew Details1 Superintendent, 3 Workers, 1 Backhoe Operator1 HDD Machine Operator,1 Front-end Loader Operator,1 Truck OperatorEquipmentHDD Model: Ditch Witch JT 2720,BackhoeSlurry Truck, andFront-end Loader,Vacuum ExcavatorSoil ConditionClay, Sandy Soil, GravelLubricant used for DrillingBentonite, Polymer and Bore GelSize of the in.

4 Access Pit and Receiving Pit6 ft long, 4 ft wide and 4 ft deepScope -Case Study 1 Actual project carried out using HDD method of installation Product pipe used Segmented 6 PVC pipe with Bulldog Restrained Joint Cost compared: Open Cut vs. HDD Using PVC (Internally restrained) Open Cut vs. HDD Using HDPE (Fusible)Trench Cross-Section for Eastland, TexasBottom Width= 18 width = 24 = 48 in. PVC Water PipeBeddingFoundationParametersQuantity Take-offLength= 318 ftDepth= 4 ftTop Width = 2 ftBottom Width= ftArea= Depth x (Top Width + Bottom Width)/2= 4 x (2 + )/2 = ft2 Volume of Excavation= Area x Length= x 318 = 2,226 ft36 in. PVC Pipe Installation by HDD Method at Eastland, TexasAssembled PipeExit PitBackfillPipe Pull BackLined Pipe for Pull BackEntry PitPipe with Restrained JointsSection 2 Pull Back(RS Means Cost Data, 2010)(Contractor s Bid)Cost Breakdown Eastland, TexasPVC PIPE4,8253,05213,8691,5122,2613,0315,139 3,7092,3466,3008711,4541,6322,93602,0004 ,0006,0008,00010,00012,00014,000 Open-cutHDDExit PitEntry PitHDD RigWater TankVacuum ExcavatorProposed 4 PVC WaterPipe16 Corrugated Steel Storm Sewer PipeExisting 2 Galvanized Steel Water PipeLocationClay County, FloridaDate of Installation02-24-2010 OwnerClay County Utility AuthorityContractorBore Hawg, Inc, Contact.

5 Jason Riggs, President Project ContactSteve Rencarge, Operations Coordinator, Length of Pipe Installation540 ft Nominal Diameter of the Pipe4 in. Dimension Ratio (DR)18 Depth from Ground to the Center of the Pipe5 ft. Crew Details1 Superintendent, 3 Workers, 1 Backhoe Operator1 HDD Machine OperatorTruck OperatorEquipmentHDD Model: Ditch Witch JT 1720 BackhoeVacuum ExcavatorSlurry TruckScope -Case Study 2 Actual project carried out using HDD method of installation Product pipe used Segmented 4 PVC pipe with Bulldog Restrained Joint Cost compared: Open Cut vs. HDD Using PVC (Internally restrained) Open Cut vs. HDD Using HDPE (Fusible)Trench Cross-Section for Clay County, FloridaTop width = 24 = 60 Width = 18 in. PVC Water PipeBeddingFoundationParametersQuantity Take-offLength= 540 ftDepth= 5 ftTop Width = 2 ftBottom Width= ftArea= Depth x (Top Width + Bottom Width)/2= 5 x (2 + )/2 = ft2 Volume of Excavation= Area x Length= x 540 = 4,725 ft34 in.

6 PVC Pipe Installation by HDD Method at Clay County, FloridaBell & Spigot JointVacuum ExcavatorPipe JointHDD ReamerPulling HeadPVC PipeLubrication of JointHDD Rig(RS Means Cost Data, 2010)(Contractor s Bid)Cost Breakdown Clay County, FloridaPVC PIPE8,3905,30718,1612,5103,5764,3597,615 4,5882,9027,9121,6491,8712,1223,78802,00 04,0006,0008,00010,00012,00014,00016,000 18,00020,000 Open-cutHDDL ocation: Eastland, TexasOpen-cutHDDPipe MaterialPVCHDPEPVCHDPET otal Cost, $33, , , Cost, $ : Clay County, FloridaOpen-cutHDDPipe MaterialPVCHDPEPVCHDPET otal Cost, $49, , , , Cost, $ CountyClay CountyOpen $ $ $ $ $ $ $ $ Cost $/L FtPVCPVCPVCHDPEHDPEHDPEHDPEPVC Open-cut is more expensive than HDD installation for Eastland and Clay County Project: Eastland, Texas Open-cut is 41% expensive than HDD Clay County, Florida Open-cut is 50% expensive than HDD Average segmented PVC is 19% less expensive than fused HDPE pipe for HDD Harbuck, R.

7 (2000). Economic Evaluation of Trenchless Technology. Proceeding of aace international transactions . Hashemi, B., Najafi, M., and Mohamed, R., (2008). Cost of Underground Infrastructure Renewal: A Comparison of Open-Cut and Trenchless Methods. Proceedings of ASCE international Pipeline 2008 Conference, Atlanta, GA. Haword, A. (2002). Pipeline Installation: A Manual of Construction of Buried Pipe, Relativity Publishing, Leakwood, CO. Najafi, M., & Gokhale, S. ( 2005 ). Trenchless Technology: Pipeline and Utility Design, Construction and Renewal. McGraw-Hill, NY. RS Means Database. (2010). Building Construction Cost Data. Construction Publishers & Consultants, Kingston, MA. Willoughby, ( 2005 ). Horizontal Directional Drilling (HDD): Utility and Pipeline Applications McGraw-Hill, you