Step 5 - Prefabricate the Tubes
Prefabricate the Tubes
To build the tubes, you will need to follow the steps outlined on pages 1-20 through 1-23.
Tubes are a bit harder to make, because each one must be cut out, then folded four times and cemented together. It may take a few minutes to make each of these members, but do the job carefully—the load-carrying capacity of your bridge depends on it!
The diagrams below highlight how the tubes are built. Each diagram represents 1 style of tube. Above each diagram is a number that indicates how many of that type of tube need to be fabricated.
To build the tubes, you will need to follow the steps outlined on pages 1-20 through 1-23.
Tubes are a bit harder to make, because each one must be cut out, then folded four times and cemented together. It may take a few minutes to make each of these members, but do the job carefully—the load-carrying capacity of your bridge depends on it!
The diagrams below highlight how the tubes are built. Each diagram represents 1 style of tube. Above each diagram is a number that indicates how many of that type of tube need to be fabricated.
10 x 10 Tubes - You will need to make 8 of what appears below.
15 x 6 Tubes - You will need to make 5 of what appears below.
10 x 6 Tubes - You will need to make 6 of what appears below.
6 x 6 Tubes - You will need to make 7 of what appears below.