PIPING UNIT

PURPOSE: To facilitate the assembly of a casing by providing a plurarity of frame bodies formed by connecting a plurarity of channels to each other in frame shape through a channel connector, and providing a frame body connector for connecting the frame bodies to form a casing. CONSTITUTION: A channel connector 5 for connecting a pair of channels 4a, 4b has a pair of side pieces 9 fitted to both sides of one channel 4a, and end pieces 10 engaged with the side face of the other channel 4b, on the opposite side to the side face brought into contact with one channel 4a. The channels 4 are then connected by the connector 5 using bolts 12 and nuts 13 so as to be formed into front and rear frame bodies 1. The contact pieces 17 of a frame body connector 2 is then brought into contact with the outer surface of the connector 5 on the back faces of the channels 4 to connect two frame bodies 1 by the bolts 12 and nuts 13 so as to be formed into a casing. Welding is therefore dispensed with at the time of assembling the casing, and the casing can be assembled easily without special skill.