Inexpensive Durable Bridges with Simple Rapid Construction

Transcription

1 Inexpensive Durable Bridges with Simple Rapid Construction Alan Cukurs P.E., S.E. J-U-B ENGINEERS Scott Ellsworth P.E., P.L.S. LOCAL HIGHWAY TECHNICAL ASSISTANCE COUNCIL (LHTAC) 1

2 Three Take Away Questions What can I expect when considering this type of Bridge? What is this technology and how can I apply it? Is this an option for me, and if yes, could I build it myself? Presentation Purpose Need Alternatives for Bridge Replacements Explain What to Expect and Outline the Technology Is this for Your Jurisdiction and can Your Staff Build a Bridge? 2

3 What is the Problem? Idaho has 4204 Bridges 2375 Bridges under local jurisdictions 806 Local Bridges over 50 years old Interactive Bridge Map 3

4 LHTAC Represent 289 Local Highway Jurisdictions in Idaho Cities, Counties, Highway Districts Owners of the 2375 Bridges Local Highway Technical Assistance Administer Federalaid to LHJ Local Bridge Program Off-System Bridge Program Programs $5M and $3.9M Average Federal-aid Project is $1M 4

5 LHTAC 809 Bridge Replacements needed Bridge Programs are $9M per year Need better option Not for all Situations Local Bridge Design Standards FHWA EDC program GRS-IBS Idea Create Bridge Design for LHJ 5

6 Local Bridge Design Standards Need Typical Bridge Situation Design for the Actual Situation Use Design as Standard for Others Not Best Option for all Situations Need Guidelines for LHJ to use Local Bridge Design Standards Use STIC Grant for Design Use Federal-aid for Construction ITD Approves Bridge Design and Foundation Design New Technology not well Accepted 6

7 Possibilities 20 to 60% savings budget Time savings No Cast in Place Concrete Equipment used What is an Alternative? 7

8 GRS-IBS BRIDGES WHAT IS IT HOW IS IT BUILT WHAT CAN IT DO FOR ME WHAT DOES IT COST EVERYDAY BRIDGES I WANT IT. FAST, CHEAP, SIMPLE AND GOOD 8

9 PARTS OF A BRIDGE WHAT IS IT (GRS-IBS) BRIDGE MADE OF A WRAPPED GEOSYNTHETIC REINFORCED GRANULAR SOIL FOUNDATION SUPPORTING AN ABUTMENT MADE OF REINFORCED GRANULAR SOIL WALL WITH A BLOCK FACING SUPPORTING BRIDGE BEAMS PREFERABLY PRECAST CONCRETE SLABS WITH A REINFORCED GRANULAR SOIL ROADWAY APPROACH AT EACH END OF THE BRIDGE 9

10 BRIDGE WITH WHAT IS IT (GRS-IBS) A FOUNDATION MADE OF GRAVEL REINFORCED AND WRAPPED IN PLASTIC SUPPORTING AN ABUTMENT WALL MADE OF GRAVEL REINFORCED WITH PLASTIC, WITH A WALL FACING BLOCK, SUPPORTING BRIDGE BEAMS (PREFERABLY PRECAST CONCRETE SLABS BEAMS) WITH BRIDGE APPROACHS MADE OF GRAVEL REINFORCED WITH PLASTIC AT EACH END OF THE BRIDGE TURNER RD. OVER PACIFIC CORP. PENSTOCK 10

11 4/5/2016 TURNER RD. OVER PACIFIC CORP. PENSTOCK ROAD CLOSURE.2 YEARS!!! TURNE 11

12 TURNER RD. OVER PACIFIC CORP. PENSTOCK REINFORCED SOIL FOUNDATION FHWA PHOTO 12

13 REINFORCED SOIL FOUNDATION FHWA PHOTO 13

14 4/5/2016 GRS Abutment and Wingwalls Beam Seat (Bearing Area) Control Point 14

15 SETTING BEAMS SETTING BEAMS 15

16 4/5/2016 Tie Rods verse Concrete Diaphragm Approach-Integrated Bridge System 16

17 OPENED TO TRAFFIC! PARTS TOP OF ROAD GRANULAR BACKFILL BEAMS GEOSYNTHETIC FACING 17

18 PREFERRED BEAM TYPE PRECAST CONCRETE SLAB BEAMS NO CONCRETE DECK TO CAST NO NEED FOR CAST IN PLACE CONCRETE DIAPHRAGMS EASIER AND FASTER TO BUILD THAN: STEEL BEAMS W/ CIP CONCRETE DECK PRECAST CONCRETE BEAMS W/ CIP CONCRETE DECK Bridge Beams (Superstructure) 18

19 Equipment and Skills SIMPLIFY ITS APPLICATION MINMIZE SKEW TO <10 DEGREES VOIDED SLAB W/PRECAST CURB BOLT AND GROUT SLABS TOGETHER (NO CIP DIAPHRAGM) WATERPROOF MEMBRANE WITH ASPHALT WEARING SURFACE ALLOW FOR VARIETY OF FACINGS UNIAXIAL GEOGRID OR BIAXIAL GEOTEXTILE 19

20 KEEP IT SIMPLE KEEP IT SIMPLE 20

21 KEEP IT SIMPLE DESIGN CONSIDERATIONS CONTROL POINTS OF FACING MATERIAL (BACK OF FACING BLOCKS) AGGREGATE FRICTION ANGLE (material specification) GEOSYNTHETIC TYPE AND PLACEMENT GEOMETRY 21

22 SIMPLIFY CONSTRUCTION STOCK PILE GRANULAR BACKFILL FOR FASTER AND EASIER PLACEMENT FIRST COURSE OF BLOCKS NEED TO BE PLUMB AND LEVEL BIAXIAL GEOSYNTHETICS (OR UNIAXIAL GEOGRID, EASE OF ORIENTATION) KEY COMMUNICATION FACING BLOCK TYPE (CONTACT LOCAL BLOCK MANUFACTURERS) SPECIFICATIONS/DRAWINGS PREBID MEETING PRECONSTRUCTION MEETING 22

23 TURNER ROAD COST ENGINEER EST: $55/SQUARE FOOT HIGH BID: $56/ SQUARE FOOT AWARD BID: $55/ SQUARE FOOT LOW BID: $50/ SQUARE FOOT AREA OF WALL: 3300 SF AWARD FOR TOTAL WALL COST OF $181,500 comparable concrete abutment wall would have cost approx. $200,000 COST EAST COAST- UP TO 60 PERCENT SAVINGS WITH D.I.Y CONSTRUCTION. UDOT BUILT THE FIRST GRS-IBS ON AN INTERSTATE: CONTRACTOR ASKED FOR APPROVAL OF GRS-IBS SYSTEM AND THIS SAVED UDOT $1 MILLION COMPARED TO OTHER OPTIONS (I-84 Echo Canyon) 23

24 WHAT CAN IT DO FOR ME SAVINGS WITH D.I.Y. CONSTRUCTION (EASE OF CONSTRUCTION) LESS COST TO DESIGN SHORTER CONSTRUCTION DURATION HAVE MONEY FOR OTHER PROJECTS CONSTRUCTION IN THE WET OR COLD NO JOINT OR BUMP AT THE ENDS OF THE BRIDGE, I.E. NO MAINTENANCE QUESTIONS 24

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