# How to Build a Paper & Glue Bridge

Written by kim blakesley
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A paper-and-glue bridge is a common assignment many science or math teachers give. The process involved in creating the bridge requires an understanding of math and physics. The assignment is given in a wide-open fashion, which means that the student makes the bridge in whatever fashion they decide. Any limitations are noted within the directions supplied for the project. The simplest paper-and-glue bridge is assembled using rolled paper logs. The process will take two to three hours.

Skill level:
Moderate

### Things you need

• Paper
• Ruler
• Scissors
• White glue
• 4 books or large items to prop the bridge

## Instructions

1. 1

Cut 91 pieces of paper into 6-inch squares.

2. 2

Place one square on a flat surface so a straight edge is along the top, bottom and two sides. Squeeze a line of glue 1/8-inch in from the top edge. Spread the glue with your finger to form a flat area approximately 1/4-inch wide across the top edge of the square. Roll the bottom edge tightly toward the top edge. Press the top edge along the glue line to hold in place. Sit aside and allow to dry for 10 minutes. Repeat the process with the remaining 90 squares.

3. 3

Make a V from two 6-inch tubes with the top spread apart 6-inches. Glue the centre of the V together. Attach a single 6-inch tube along the opening of the V to create a triangle. Glue both ends of the 6-inch tube in place. Repeat the process for a total of 15 triangles. Allow the triangles to dry 10 minutes.

4. 4

Place the flat edge of one triangle on a horizontal axis. Place a second triangle in the same position so the two points in the centre are touching. Turn a third triangle upside down so the flat edge is on top. Position the point so it matches the two edges that are touching. Squeeze glue along the touching edges. Allow the three glued triangles to dry for 10 minutes. Repeat this process for a total of five sets of three triangles. These are the supports and the top sections of the bridge.

5. 5

Place a drop of glue on the end of one 6-inch tube. Stand two of the supports up so the two triangles that touch are on top. Place the single flat edge of the triangle on the bottom. Position the two bridge supports so they are directly across from one another and 6-inches apart. Place one glued end of the 6-inch tube on each side of the bridge supports. Make sure the connect directly across from one another. Repeat the process until the bridge floor covers the length of the two supports. Set aside. Prop the sides against a book or tall container to ensure they do not slide while drying.

6. 6

Place one of the bridge supports on a flat surface. Stand a bridge support on either side of the one on the bridge support on the flat surface. Notice one side matches and the other side is too long. Match the two sides that are the same length. Glue along the joining edge to form one side of the bridges safety rails. Center the second side so it extends equally past the short edge of the support. Glue along the joining edge. Hold in place or prop the sides for 10 to 15 minutes until they dry.

7. 7

Flip the top of the bridge over so the opening is on the bottom. The top and two sides are encased with triangles. Center and place the top of the bridge on the bridge floor. Glue along the adjoining areas. Allow the bridge to dry 30 minutes before moving.

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