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Transportation Research Board 2002 Annual Meeting Presentations from Workshop on Plan of Action for Scour Critical Bridges


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Slide 1

INNOVATIVE APPROACHES TO COUNTERMEASURE DESIGN

P.F. Lagasse, Ph.D., P.E.
Transportation Research Board
2002 Annual Meeting

Sponsored By
A2A03 Committee on Hydrology, Hydraulics and Water Quality

Slide 2

1998 SCANNING REVIEW EUROPEAN PRACTICE FOR BRIDGE
SCOUR AND STREAM INSTABILITY COUNTERMEASURES

Sponsored by FHWA, TRB, AASHTO

Slide 3

OBJECTIVES

  • Review and Document innovative techniques to mitigate the effects of scour and stream instability at bridges.
  • Evaluate for potential application in the U.S.
  • Share information on U.S. practice with counterparts.

Slide 4

RIPRAP

  • Most common countermeasure
  • Permanent countermeasure against pier scour
  • Specialized equipment for placing
  • Quality control
  • Partially grouted riprap

Slide 5

FILTERS

  • Laboratory testing of geotextiles
  • Geotextile containers
  • Geotextile mats
  • Fascine mats

Slide 6

APPLICATIONS AND RECOMMENDATIONS

  • Riprap and Filters
  • Partially Grouted Riprap
  • Update of FHWA HECs

Slide 7 - 8

NCHRP PROJECT 24-07(2)COUNTERMEASURES TO PROTECT BRIDGE PIERS FROM SCOUR

OBJECTIVES

TO DEVELOP AND RECOMMEND:

  1. PRACTICAL SELECTION CRITERIA FOR BRIDGE PIER SCOUR COUNTERMEASURES
  2. GUIDELINES AND SPECIFICATIONS FOR DESIGN AND CONSTRUCTION
  3. GUIDELINES FOR INSPECTION, MAINTENANCE, AND PERFORMANCE EVALUATION

THE COUNTERMEASURES TO BE CONSIDERED INCLUDE RIPRAP, PARTIALLY GROUTED RIPRAP, CABLE-TIED (ARTICULATING CONCRETE) BLOCKS, GABIONS, GROUT-FILLED BAGS AND MATS, AND GEOTEXTILE SAND CONTAINERS (USED AS A STAND-ALONE COUNTERMEASURE OR ASA FILTER)

Slide 9

Photo: Fully Grouted Riprap

Slide 10

Photo: Partially Grouted Riprap

Slide 11

Photo: Partially Grouted Riprap Fractured to the desired conglomerate

Slide 12

Photo: Automatic Installation of a Partially Grouted Riprap Revetment

Slide 13

Photo: Grouting Frame for partially grouted riprap in water

Slide 14

Photo: Example of a typical team doing partially grouted riprap by hand

Slide 15

Photo: Close up of a team doing partially grouted riprap by hand

Slide 16

Photo: Closer view of a team doing partially grouted riprap by hand

Slide 17

Photo: Close up of result of partially grouted riprap - voids can be seen between the grout and riprap

Slide 18

Photo: Batch plant for mixing grout to be pumped in to hose

Slide 19

Photo: close up of batch plant operation

Slide 20

Photo: system for filling geotextile containers with sand

Slide 21

Photo: Technician sewing a seam on a geotextile container

Slide 22

Photo: Close up of a battery operated sewing machine

Slide 23

Photo: Lifting operation of a sand container into a barge

Slide 24

Photo: Sand containers being pushed off a barge

Slide 25

Photo: Lifting sand container to show its flexibility

Slide 26

Photo: Placing a geotextile sand container

Slide 27

Photo: Overview of sand container placing procedure

Slide 28

Photo: Overview of sand container placing procedure

Slide 29

Photo: Closeup of geotextile container prior to being filled

Slide 30

Schematic of geotextile and partially grouted riprap installation at a bridge pier

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Updated: 04/07/2011
 

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