The bridge tool is made of wooden planks, the same size as the furniture, about the same size as the

That depends on the shape and length of the bridge you make, I say one straight one for you, and the rest for you to play yourself.

1.cut the planks to the longest one as a bridge;

2.Cut two wooden strips about 15-20 cm wide and the same length as the bridge as the load-bearing main beam, nailed to both sides of the bridge;

3.Cut 5-6 planks as wide as the bridge and as wide as the main beam as the secondary beam to be evenly nailed to the bridge and the main beam from front to back;

4.Cut 8 wooden strips of about 10 cm, nail each two together into a figure 7 as a bridge pier, the height is the height you know, nail it to the four corners of the bridge, and every two bridge piers should be made into a figure-eight shape so that the bridge body is stable;

5.Cut two wooden strips and nail them under the pier to stabilize the pier, and then cut two slightly longer wooden strips to make the pier into a figure-eight shape;

6.Cut 4 wooden strips from the bottom of the pier to the middle of the bridge girder nailed; 7

7.Cut a 5-6 cm strip of wood and nail it between the planks under the two piers.

In this way, a flat bridge is made, a bit like a stool, of course, you can play with this principle to make an arc bridge, and the wooden plank mentioned in the inscription refers to the wooden plank of meters.

Go and learn the load-bearing principle of Zhaozhou Bridge. Forget.

You can refer to the principle of railway bridges.