What does it mean that there is a bridge sign under "30t 13t"?

It is a load limit sign with a gross vehicle weight of 30t and a single axle weight of 13t.

Limiting axle load means that vehicles whose axle load exceeds the value shown in the sign are prohibited from passing. Located at both ends of a shorter bridge that needs to limit the axle load of vehicles. If the bridge is very short, and the car body can't be completely on the bridge, or the front or rear wheels, then the axle load of the front and rear wheels of the car should be limited at this time.

Extended data:

?

Difference from limiting quality

When the vehicle crosses the bridge, if the bridge body is long, the whole vehicle will be pressed on the bridge, which will limit the mass according to the bridge load.

If the bridge body is long, the whole vehicle will be placed on the bridge, which will limit the mass according to the bridge load; If the bridge is very short, and the car body can't be completely on the bridge, or the front or rear wheels, then the axle load of the front and rear wheels of the car should be limited at this time.

Relationship between axle load of automobile and pavement damage

Based on the principles of equivalent deflection of pavement, equivalent tensile stress at the bottom of base, equivalent compressive strain at the top of soil foundation and equivalent rutting, the axle load indexes in the axle load conversion formula are calculated and compared, and on this basis, reasonable axle load indexes are put forward. With the help of the established axle load distribution model, the influence of different axle load indexes on pavement service life is analyzed.

Baidu encyclopedia-limiting axle load