BH GIRDERTOWOONG E&C BH GIRDER Universities U.C. Davis (USA) Prof. Jonh Bolander Yonsei University (Korea) Prof. Yunmook Lim Research Institute GS E&C Corporation Infrastructure Research Team Towoong E&C Research Center Structural Designer Eurim E&D Sambo Engineering Yooshin Corporation BH GIRDER . BH Girder Outlines Half-Slab Bulb-Tee Shape Girder Continuation Intermediate Anchoring Device Pre-Stress Optimization . 2m) 60.30) .20) 0.900) 2.Advanced Bulb-T Shape Bulb-Tee Shape (PCI) Comparison BH Girder (47.40 1.50(2.362 2.50) Bulb-Tee Shape (BH Girder) PCI Span Height Spacing Upper Flange Width Lower Flange Width 47.2) 2.40(1.81 1.300 (1.0 (47.19 2.20(2.2 2. Half-Slab Replace a Form with Half-Slab Replacement of Slab Thickness 100mm Immediately Concrete Placing after Girder Set Contribute to Girder Stiffness Increasing Improvement of Workability and Safety . Pre-stress Optimization Straight Tendon Arrangement Minimize of Friction Loss Intermediate Tendon Arrangement Maximization of PS Efficiency Minimize of Long Term Loss . Simple Continuation For Reduce of Expansion Joint Other Type Continuation Method BH Girder Continuation Method Existing Continuation Method Rebar Only or Extra PSC Continuation Method Rebar Only : Crack Occurrence Extra PSC : 3Span Over Continuation Impossible BH Girder’s Continuation Method Choice of a Simple Method Need not Considering Girder when Continuation Beneficial Way for Designing and Construction . . Finite Element Analysis End-Section Anchorage Intermediate Anchorage Continuation Part RM Space RBSN (Rigid Body Spring Network) . 000 USD Construct Bridge by Launching Gantry UiJeongBu Light Railway Construction Site .08 Construction Cost : 14.000.10 ~ 2012.Launching Girder Uijeongbu Light Railway Launching Application Analysis for BH Girder GS E&C and Towoong E&C’s Achievement Site : UiJeoungBu Light Railway Construction Period : 2007. . Construction Process . . 829 2.40 BH Girder 41.07 2.20 0.30 .1 1.BH Girder and PSC-I Beam(PCI) PSC-I Beam’s Cross Section (PCI) Comparison BH Girder’s Cross Section PCI-I Span Height Spacing Upper Flange Width Lower Flange Width 41.1 1.71 1.500 2.50 1. 80 2.300 2.70 1.BH Girder and PSC-I Beam (Beton) PSC-I Beam’s Cross Section (Beton) Comparison BH Girder’s Cross Section Beton Span Height Spacing Upper Flange Width Lower Flange Width BH Girder 47.30 47.30 .900 2.0 1.50 0.0 2.20 0. 30 1.20 1.850 2.30 .90 2.9 1.30 BH Girder 31.400 2.BH Girder and U-Girder U-Girder’s Cross Section (Indonesia) Comparison BH Girder’s Cross Section U-Girder Span Height Spacing Upper Flange Width Lower Flange Width 31.50 1.9 1. 50 1.25 BH Girder 40.BH Girder and Super-T Beam Super-T Beam’s Cross Section Comparison BH Girder’s Cross Section Super-T Span Height Spacing Upper Flange Width Lower Flange Width 40.70 1.500 2.20 0.750 2.96 2.0 1.30 .0 1. Rule Out of Form and Supporting post Conventional Slab Working Method Safety Working with Half-Slab Exclude Slab Form Installation Works Exclude Slab Form Disassemble Works Exclude Slab Form Supporting works Prevent Negligent Accidents Improvement of Workability Threaten the Safety Improvement of Safety . Maintain Slab Surface Smoothness Decked Bulb-T Girder Safety Working with Half-Slab Full Deck Bulb Tee Beams Difficult to Compensate for Surface Deviations Difficult to Girder Setting in Narrow Interval Remaining Hazards like Overturn Remaining Risks with Beam Structure Damaging Half Deck Bulb Tee Beams Available to Compesate for Physical Deviations Available to Girder Interval Safe to Overturn Safe to Beam Structure Damaging . The Lowest Height BH Girder’s Height PSC Beam(PCI)’s Height Earthworks Reduction Amount Decrease Earthworks Amount than Another PSC Beams Possible the Securement Space below Girders Save the Cost of Construction for Earthwork Keep the Slender Shape Give the Sense of Openness Contribution for making a fine view . 000 USD x 2Crane x 2 Span = about 60.000 USD x 10 unit = about 50.The Longest Length among PSC Beams Other PSC Beams with 40m BH Girder with 60m Suppose Constructing 240m Bridges… (in South Korea) Decrease the Cost of Making 2 Piers = about 200.000 USD .000 USD Decrease the Cost of Crane = about 15.000 USD Decrease the Period of Salvage Work = about 5.000 USD x 2 span = about 400.000 USD Total Saving Costs = about 510. 0m PSC-I Beam 30.0m Pier Construction Girder Installation Slab Construction 234 Days 40EA/3Days 140 Days 377 Days BH Girder 60.0m Pier Construction Girder Installation Slab Construction 60% ~44% 156 Days 30EA/3Days 52 Days 211 Days .0m Pier Construction Girder Installation Slab Construction 390 Days 60EA/4Days 140 Days 534 Days PSC-I Beam 45.Reduce Construction Periods B=24.0m. L=180. Construction Costs Reduction Decrease of Earthworks Earthworks Reduce (compared with PCI Bulb-T) PCI Bulb T Beam’s Height (Length= 47.5% Reduce .8% Reduce Decrease of Piers Pier Works Reduce (assumption L=240m) PSC Beam’s General Longest Length : 40m x 6unit (5 Piers) BH Girder’s Longest Length = 60m x 4unit (3 Piers) Reduced Percentage of Pier works = (2/5)x100 40.0% Reduce Decrease of Periods Periods Reduce (assumption B=24m.2m) = 2. L=180m) PSC Beam’s Construction Periods = 534 days BH Girder’s Construction Periods = 211 days Reduced Percentage of Periods = (323/534)x100 60.362)x100 23.2m) = 1.362m BH Girder’s Height (Length = 47.800m (except Half-Slab) Reduced Percentage of Earthworks = (0.562/2. 0m.Reduce of CO2 Footprint B=24.0m (In South Korea) 48t-CO2 17t-CO2 4240 t-CO2 3072 1.199 Ton PSC 30m Remicon t-CO2 BH 60m Oil . L=180. . Design & Construction Applying Results Design Applying Results Hwayang – Jeokgeum Expressway Seoul – Moonsan Expressway Pyeongtaek East Detour Way Sejong Special Self-Governing City Rural Development Administration Relocation The Second Seoul-Incheon Expressway Asan Tangjeong District Development Kimhae Technovalley Development Oksan – Ochang Expressway Hwasung Dongtan District Development Construction Applying Results Seoul – Moonsan Expressway Sejong Special Self-Governing City Rural Development Administration Relocation Kimhae Technovalley Development . Se-Jong Special Self Governing City Salvage Working Process Preparation Girder Loading Transporting 1st Girder Lifting 1st Girder Installation 2nd Girder Lifting . 0m . Span = 57.Se-Jong Special Self Governing City The First BH Girder Pier Height = 27.0m. . Pre-Assemble Rebars on the Ground 3. Lift the Pre-Assembled Rebar-Net 4. Insert the Rebar-Net on Coping Form in Advance Expectation Reduction of Construction Period : 35% Reduce Reduction of Construction Cost : 24% Reduce Minimize of Influence about Traffic Flow Improvement of Workability and Safety .Coping Rebar Pre-Assembling Introduction of Technology Concept Pre-Assembling on the Ground Weight Lightening of Pre-Assembling Form Applying of Shape Change Available Form Process 1. Set and Install Pre-Assembling Forms 2. PSC Trough(Lower Route) Bridge Introduction of Technology Concept Available for 45m High-Speed Railway Producing by Pre-Stressed Beam Method Possession of Trough(Lower Route) Bridge Less than 4m of Girder Height (Max. Height) Available for Double Track Railway Single Track Railway Expectation Reduction of Construction Period : 20% Reduce Reduction of Construction Cost : 30% Reduce Prevent of Noise Secure Spaces under the Bridge Train Fall Prevent Effect Double Track Railway . GS E&C Corporation Senior Research Engineer Kim. Seok-Min [email protected] .kr Towoong E&C General Manager Yoon.co. Do-Hak dohkim@gsconst.