Method for carrying out printing on inner and outer surfaces of building

A method for carrying out printing on inner and outer surfaces of a building, which performs printing of a print text on the inner and outer surfaces of the building by using a printing apparatus in which printing ink used for a piezo method or printing ink made of a UV curable material is contained in a spray means according to user's selection, the piezo method or a UV curing method is selected according to a type of the printing ink contained in the spray means, and the spray means, a curing means, and a coating agent application means are sequentially disposed to sequentially perform spraying of the printing ink in the piezo method or the UV curing method, curing of the printing ink, and spraying of a coating agent while the apparatus travels, the method comprising:

• a pre-processing step of removing foreign matters from a surface of concrete constituting the surfaces of the building;
• a spray step of spraying a water-soluble metallic salt stain to the inner and outer surfaces of the building, which are cleaned through the pre-processing step, by using the spray means of the printing apparatus in the piezo method by applying electrical vibration and a physical pressure in a direction of the surface to allow the metallic salt stain to be permeated into the surfaces of the building and thereby to form the print text;
• a coating step of applying and drying the coating agent by using the coating agent application means of the printing apparatus to prevent the surfaces of the building from being neutralized and reinforce the surfaces in a state in which the print text is formed on the surfaces of the building through the spray step;
• a glossing step of polishing the surfaces by using a diamond resin pad when the coating on the surfaces by using the coating agent is completed through the coating step;
• and
• a surface protection agent coating step of applying a water repellent agent onto the surfaces, which are polished through the glossing step, to buff the surfaces by using a buffing pad, thereby performing water repellent on the surfaces of the building,
• wherein the printing apparatus operates select the piezo method or the UV curing method through an input of a separate switch or keypad means to operate, and the coating agent application means is mounted on a rear end of a body or the curing means to spray the coating agent to a position at which the printing ink is sprayed in the piezo method,
• in the printing step and the coating step, a desired amount of the printing ink and an amount of the coating agent to be applied are measured by using a distance measuring function of the printing apparatus to form the print text by using the measured amounts, and
• the body has a plate shape and is provided with the spray means therein or on a surface thereof, and a moving means receiving power to move the body in front/rear and left/right sides is disposed on each of both ends of the body.