Protective device for road and bridge construction

A protection device for road and bridge construction comprises a telescopic protection assembly. The sliding adjusting assembly is arranged on the rear side of the telescopic protection assembly and used for adjusting the length of the telescopic protection assembly; the extension adjusting assembly is arranged between the sliding adjusting assemblies and used for adjusting the length of the telescopic protection assembly; the device has the advantages that the length of the telescopic protection assembly is adjusted through the sliding adjustment assembly and the extension adjustment assembly, and the sliding adjustment assembly and the extension adjustment assembly can be independently used for adjustment and can also be matched for adjustment; flexible adjustment is carried out according to the size of a construction road surface, and the required construction range is enclosed; meanwhile, in the construction process, adjustment can be conducted in time, the constructed road surface is adjusted to the oute