The invention relates to a spraying apparatus, a paving
machine, and a construction method of liquid-state
asphalt. The
asphalt spraying apparatus is arranged on a body of the paving
machine through an installation frame. The
asphalt spraying apparatus is arranged on the rear part of the paving
machine, and in front of a material-distributing screw. The asphalt spraying apparatus comprises a
fixed frame, a slide frame, a spraying
nozzle, and a driving apparatus. An inflow pipeline, a
backflow pipeline, a spraying pipeline, and controlling valves which with the pipelines communicate with each other are arranged in the spraying
nozzle. A speed measuring sensor used for determining a sideslip speed and a displacement of the slide frame is arranged on the
fixed frame. The spraying
nozzle is connected with an asphalt input
pipe through an asphalt inlet
pipe, and is connected with an asphalt
backflow pipe through an asphalt outlet pipe. The asphalt input pipe and the asphalt
backflow pipe communicate with an asphalt storing tank. An asphalt pump and a gas / liquid controlling valve are arranged on an input end of the asphalt input pipe. The gas / liquid controlling valve is connected to an
air compressor through a
gas pipeline. The apparatus provided by the invention is advantaged in small
land occupation, simple and compact structure, and high
automation degree. With the spraying apparatus, during a paving machine low-speed paving procedure, the spraying nozzle is prevented from continuously spraying asphalt, such that a non-uniform paving phenomenon is avoided, and a paving quality is improved.