CAB SUPPORT DEVICE FOR CONSTRUCTION MACHINE

PROBLEM TO BE SOLVED: To improve a structural maintenance property by adjusting at least one side of structural spring constants and buffer carrier spring constants to set the spring constants to the predetermined relation, and making the spring constants of all support sections equal. SOLUTION: Layout position sections (a)-(d) of multiple buffer carriers are set on the deck section of the revolving frame 26 of an upper revolving superstructure, and a cab is mounted on a deck section 8 via four buffer carriers. The spring constants of the buffer members used for the buffer carriers are set different so that the sum of the spring constant of each of the layout position sections (a)-(d) determined in advance and the spring constant of each buffer carrier arranged at the layout position sections (a)-(d) becomes an equal value. A buffer carrier having a small spring constant is arranged at a layout position section having a large spring constant among the layout position sections (a)-(d), and a buffer carrier having a large spring constant is arranged at a layout position section having a small spring constant, thereby balanced vibration is applied to the support portions of the cab, the distortion of the cab can be suppressed to the minimum, and its structural maintenance property is improved.