PROBLEM TO BE SOLVED: To provide a coupling unit 60A making it possible to precisely define a relative position between a plurality of connectors regardless of the welding between a plurality of main pipes and the plurality of connectors of a lattice structure included in a work machine.;SOLUTION: A coupling unit 60A includes a plurality of connectors 62A jointed to end parts 52a of a plurality of main pipes 52 included in a lattice structure 16B and a connector connecting material 64 for connecting the connectors 62A with each other. Each connector 62A includes a fitting part 67 that can be fitted to the end part 52a of the main pipe 52, an attachable/detachable connection part 68 that can be attachably/detachably connected to a counterpart connector 62B provided on an end part of the other lattice structure 16C, an outer peripheral surface 66a that can be welded to an outer peripheral surface of the end part 52a of the main pipe 52 over the entire periphery of the main pipe 52 while the fitting part 67 is fitted to the end part 52a of the main pipe 52, and a connected part to which an end part of the connector connecting material 64 is connected.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2019,JPO&INPIT
展开▼
