Abstract: The typical lining trolley has disadvantages such as complex structure, enormous span, extremely large size, challenging assembly, and high cost when applied in the lining construction of giantspan flat underground caverns. The lining construction of the giantspan flat underground cavern is distinguished by its vast volume, large area, large selfweight, and thick reinforcement. A new heavyduty lining trolley with a pushing sliding buckle support system comprising the technical advantages of the buckle support system and fullyhydraulic lining trolley is designed and developed for an underground cavern with a span of approximately 70 m and a rise to span ratio of approximately 0.21. The trolley is composed of jacking adjustable formwork, buckle support gantry, pushing sliding chassis, rotary butt joint distribution, and plugin vibration technology. These components are supported by hydraulic and electrical control technologies, integrated with numerous other technologies such as trolley selfpropelled technology, concrete pouring, vibration, maintenance, and monitoring. The successful application of the trolley in an enormous underground cavern reveals that the heavyduty lining trolley with pushing sliding buckle support has the advantages of simple structure, high strength, strong bearing capacity, and ease of assembly, which can effectively reduce labor intensity and cost, and improve construction efficiency and quality.

Key words: giantspan underground cavern, lining construction equipment, buckle support system, pushing sliding