THE NEXT 6 SLIDES ARE EXAMPLES OF ROADBEDS FOR EACH TYPE OF TRUSS BRIDGE

UNDERNEATH DECK TRUSS

THROUGH TRUSS

TRIANGULAR TRUSS

K TRUSS

WARREN TRUSS WITH VERTICAL SUPPORTS

BALTIMORE TRUSS

GET THE ROADBED WORKSHEET DO NOT COVER THE HOLE IN THE TEST BLOCK!

TAPE THE ROADBED WORKSHEET TO THE FOAM BOARD AT THE 4 CORNERS TAPE THE ROADBED WORKSHEET TO THE FOAM BOARD AT THE 4 CORNERS. NO WAX PAPER IS NEEDED! YOU WILL NEED A DIME SIZE DOT OF GLUE ON A PIECE OF SMALL SCRAP PAPER.

STAND UP THE 2 TRUSSES ON THE 2 SOLID BLACK LINES AND TAPE THE TRUSS TO THE PAPER. PLACE THE TAPE ON THE OUTSIDE OF THE TRUSS. ROADBED PIECES WILL BE PLACE WHERE THE TEST BLOCK IS LOCATED. NOTE: TRUSS NEEDS TO STAND VERTICALLY

THE 2 TRUSSES STANDING VERTICALLY IS IMPORTANT FOR THE TEST BLOCK TO FIT THROUGH THE OPENING.

THE TOP OF THE TRUSS SHOULD MEASURE 2 ½ INCHES

TEST BLOCK MUST FIT BETWEEN THE 2 TRUSSES

PLACE THE ROADBED BALSA WOOD PIECES WHERE THE TEST BLOCK IS LOCATED PLACE THE ROADBED BALSA WOOD PIECES WHERE THE TEST BLOCK IS LOCATED. DON’T ADD MANY PIECES TOWARDS THE END OF THE TRUSSES WHERE THE TEST BLOCK IS NOT LOCATED. IMPORTANT - LAY BALSA WOOD ON TOP OF BOTH TRUSSES. CAUTION: NOT IN BETWEEN THE 2 TRUSSES

CUT THE BALSA WOOD USING THE BALSA CUTTER & GLUE THE PIECE IN PLACE.

USE THE REMAINING BALSA WOOD TO FORM A ROADBED USE THE REMAINING BALSA WOOD TO FORM A ROADBED. NOTICE - THE ROADBED PIECES ARE LOCATED OVER THE TEST BLOCK. DO NOT COVER THE HOLE ON THE TEST BLOCK.

YOU MAY LAY PIECES ON TOP OF EACH OTHER (2 PIECES MAX.)

YOU MAY USE DIAGONALS

EXAMPLE OF THE TEST BLOCK RESTING ON THE ROADBED

SIDE VIEW OF TEST BLOCK RESTING ON THE ROAD BED

STORING YOUR BRIDGE GIVE IT TO YOUR INSTRUCTOR DO NOT REMOVE YOUR BRIDGE FROM THE FOAM BOARD UNTIL THE NEXT CLASS. GLUE MUST DRY.