The tire-type beam lifting gantry, also known as the tire-type beam transporter, features a gantry frame structure with multiple sets of heavy-duty rubber-tire traveling bogies at the base of its legs. Powered by an onboard diesel generator set, it utilizes full hydraulic drive for traveling, steering, and lifting. It can move straight, traverse laterally, crab-walk diagonally, and rotate in place, making it suitable for hardened precast beam yard surfaces without being restricted by rails.
Five Major Components of the Machine
- Metal Gantry Frame Structure: Twin box-type main beams + four box-type legs, made of Q355B high-strength steel, with modular bolted and pinned assembly for easy disassembly, transport, and relocation; large clearance under the legs allows beam transport vehicles to drive directly into the gantry for loading.
- Tire-Type Traveling Bogies: Multiple sets of heavy-duty rubber tires with hydraulic suspension and three-point leveling, automatically equalizing loads on slightly uneven ground; full hydraulic multi-mode steering (straight, lateral, crab, and pivot rotation).
- Lifting Mechanism: Dual-winch lifting trolley equipped with a dedicated box girder spreader, featuring four-point lifting with three-point leveling to protect concrete box girders; the trolley offers longitudinal and transverse fine adjustment for precise beam alignment and loading.
- Power and Hydraulic System: Diesel generator set with closed-loop hydrostatic drive; includes traveling, steering, suspension, and auxiliary support cylinders, all with pressure overload protection.
- Electrical Control System: PLC programmable control with dual operation via cab and remote control; real-time monitoring of machine attitude, inclination, pressure, and wind speed.
Main Models
- TTB / MGLT‑450: Single unit 450t; two units used in tandem to handle 900-ton 32m box girders for high-speed railways;
- MGLT‑500: Single unit 500t, suitable for 40m long-span box girders;
- MGhz‑900: Integrated 900t tire-type beam lifting gantry, capable of lifting 900-ton box girders with a single machine.
⚠️Comparison with rail-type beam lifting gantries:
- Tire-type: No rails required, high mobility, can be relocated between beam yards; ground must be hardened, with higher ground bearing pressure.
- Rail-type: Smoother operation and lower cost; requires dedicated rails, and movement is constrained by the rails.
Key Advantages
✅ No rail installation required, self-contained diesel power, flexible beam yard layout; ✅ Multiple steering modes—straight, lateral, crab, and pivot turn—maximizing yard utilization; ✅ Four-point lifting with three-point leveling protects precast box girders; spreader trolley allows longitudinal and transverse fine adjustment for high-precision beam loading; ✅ Modular assembly and disassembly, allowing one set of equipment to be reused across multiple beam yards; ✅ Capable of cross-pier operations, lifting box girders onto bridge decks, loading beam transport vehicles, and facilitating full relocation and lifting of bridge erection machines.
Applicable Working Conditions
Precast beam yards for high-speed railways, passenger dedicated lines, and intercity railways; suitable for 20m/24m/32m/40m full-span prestressed concrete box girders, completing the pedestal beam lifting – beam storage – beam transport – loading onto beam transport vehicles process; used in outdoor hardened yard environments.
