To build a bridge you must join many separate pieces. The stronger the joint,
the stronger the bridge. We are going to view several methods
of joining your bridge together.
Butted JointButted Joint
Scarf JointScarf Joint
Lap JointLap Joint
Half-Lap JointHalf-Lap Joint
LaminationLamination
Notched JointNotched Joint
Beveled JointBeveled Joint
Butted JointButted Joint
A Butt joint is the weakest type of joint.Two pieces of wood joined at the ends,
do not support each other. All that holds them together is the glue.
Scarf JointScarf Joint
Scarf joints do provide more support.If a force were applied downward onthis joint, one piece of wood, would
press against another adding strength.
Lap JointLap Joint
The more two pieces of wood overlap, the more they can help each other.
The dotted line represents a pin. A pin prevents the two pieces of wood
from pulling apart.
Beveled JointBeveled Joint
Tight fitting beveled joints prevent gaps and spaces that weaken the bridge.
Beveled pieces can be pinned also.
View the next few slides for constructionView the next few slides for constructiontechniques used on a real bridge.techniques used on a real bridge.
Can you determine theCan you determine the construction technique they used?construction technique they used?
Photo By: Doug Porter
This joint show an excellent example of lamination. Pins and bolts were used to hold the boards together3
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