Arm structure and ballast bed track construction and maintaining device adopting same

The embodiment of the invention discloses an arm structure and a ballast bed track construction and maintaining device adopting the same, and relates to the technical field of construction machinery.The arm structure comprises a main arm assembly and an auxiliary arm assembly. The main arm assembly comprises a first force bearing arm, and the first force bearing arm is of a bent type structure, and hinged to the first end of a connecting seat, and conducts pitching motion relative to the connecting seat. The auxiliary arm assembly comprises a second force bearing arm, the second force bearingarm is of a bent type structure, one end of the second force bearing arm is hinged to the first force bearing arm, and the second force bearing arm conducts pitching motion relative to the first force bearing arm, wherein the bending direction of the first force bearing arm is opposite to that of the second force bearing arm. Through the design of the bent type structures of the main arm assemblyand the auxiliary arm asse