BRANCHING TROUGH, BENT TROUGH, BRANCHING TROUGH CONNECTION STRUCTURE, TROUGH LINE, BRANCHING TROUGH FIXING STRUCTURE, BENT TROUGH FIXING STRUCTURE, AND METHOD FOR CONNECTING CABLE PROTECTION MEMBER TO BRANCHING TROUGH

原文（中国語）

A branching trough includes side plates forming both side surfaces, and a bottom plate constituting a bottom surface. Both side plates are upright so as to surround the bottom plate. A cross section of the branching trough is U-shaped, and the branching trough is T-shaped in a plan view. A female joining structure for connecting a cable protection member is formed in openings at both longitudinal direction ends of a main trunk section. A female joining structure for connecting a cable protection member is formed in an opening at the leading end of a branch section. A vertical rib of an elbow section of the side plates can serve as a vertical rib inside the female joining structure. On the back surface of the main trunk section and the branch section, a hollow columnar protrusion protrudes downward to a prescribed height from the bottom plate at a prescribed position.