I don’t tell him where the “center of gravity” of the bridge is?

To find the "center of gravity" of a bridge, we must first know what a bridge is.

In the eyes of tourists who are viewing the scenery and appreciating the painting,

it looks like this.

In the eyes of the on-line operators

It looks like this

 

In the eyes of the bridge and tunnel workers who climb up and down, it looks like this

In the eyes of the inspectors who were looking for the center of gravity of the bridge

It looked like this

 

As a geometrically regular component, the center of gravity of the bridge is clear at a glance. So will it still be the same after carrying the "line" and "train"? Then we need to find its "center of gravity" - "line bridge eccentricity", which is simply the deviation between the center of the line and the center of the bridge.

If the eccentricity exceeds the limit, the bridge eccentricity is compressed, the structure is easily damaged, and in severe cases, it will overturn. Now follow the inspectors to find the "center of gravity" of the bridge.

Single-track bridges are conducive to the operation of "bridge eccentricity ruler". Measure the value a from the inside of one rail to the outer edge of the ballast groove, and measure the value b of the other rail in the same way. The absolute value of the difference between a and b divided by 2 is the eccentricity value

What about double-track bridges and curved bridges? More data is needed to calculate the width of the outer edge of the ballast groove, the line radius, the height level, and the beam gap.

 

The feet are steaming with hot earth, and the back is burning with scorching sunlight.

I am exhausted and don't feel the heat, but I hope the bridge is stable.

Inspectors must find its "center of gravity" regardless of the weather.

The "center of gravity" of the bridge needs to be "stable".

This is the only way to bear more "pressure".