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London’s Tower Bridge, England
A combined draw-bridge and suspension bridge

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An SLJ90032 Bridge Girder is a giant construction machine used to build whole bridges

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Click to view required bridge design specs:

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What Makes Bridges So Strong? | Engineering for Kids | STEAM | SciShow Kids

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TRUSSES - the secret to bridge strength 

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TRUSSES - the secret to bridge strength 

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● Span length > 45 cm

● Width max = 14 cm

● Height max = 25 cm

● Depth max = 9 cm

Not allowed:

• Doubling up of full length sticks (1 cm long “spacers” at least 5 cm apart are allowed between parallel running sticks only)

• Excessive amounts of glue on the joints

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Open this document and make sure to read through it carefully.