Joints for Bridge Building. To build a bridge you must join many separate pieces. The stronger the...

Joints for Bridge Building

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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.

Half-Lap JointHalf-Lap Joint

This is one of the strongest types of joints.

LaminationLamination

Lamination adds weight, but can provide huge amounts of support.

Notched JointNotched Joint

Notching locks pieces together and adds strength.

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

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This is a half-lap joint

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This joint combines a notch and a bevel

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This joint show an excellent example of lamination. Pins and bolts were used to hold the boards together3


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Here is an example of lap joints

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These joints show a butted joint and a notched joint side by side

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Putting it all Together

Joining the trusses and adding the deckPhoto By: Doug Porter


Beveled and Notched Joints



Lap, Bevel and Notch Joints


Testing your Bridges

Joints for Bridge Building. To build a bridge you must join many separate pieces. The stronger the...

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