Arched Trolley QLGJ312A

The QLGJ312A series tunnel arch‑erection machine is a versatile, multi‑purpose tunnel‑construction rig capable of handling steel arch installation of various specifications, as well as supporting auxiliary functions such as charge‑loading platforms, rock‑breaking operations, and ventilation‑duct installation. It meets the regulatory and safety requirements for installing single‑span or multi‑span steel arches— including I‑beam arches, H‑section steel arches, and steel‑grid arches—in railway and highway tunnels, while accommodating the installation distances required for single‑bore, single‑track, double‑track, and triple‑track tunnels under full‑face, bench‑cut, and core‑soil‑retaining excavation methods.

The core components of the entire machine are of premium quality, ensuring high reliability and stability.

Cummins-brand engines and aerospace‑grade hydraulic transmissions;

Dedicated heavy-duty engineering drive axle, heavy-duty tires;

The hydraulic system’s pumps, motors, valves, and cylinders are sourced from well-known domestic and international brands.

The CAN bus control system employs controllers and other critical electrical components from both domestic and international brands.

Product Features

High equipment installation efficiency

• Through optimal analysis, the robotic arm’s movements have been designed to be user-friendly—easy to learn and operate, ensuring you’ll never struggle to find an operator.
• The boom and manipulator are equipped with electro‑proportional control valves and feature wireless remote operation, enabling precise control for smooth, accurate, and rapid movements.
• The personnel responsible for clamping and moving the arch support are separated from the arch unit, enabling rapid relocation and assembly while ensuring personnel safety.
• The dual‑hanging basket welding machine achieves the highest efficiency when performing parallel operations to weld mesh panels.
• Under the specified construction method conditions, the installation of three arch frames can be completed in as little as 30 minutes, and each equipment shift requires only 4 to 5 workers (including 2 operators).

Safety

• During the erection of the arch frame, operators work only inside the suspended scaffold when installing the connecting bolts (with no connection to the arch frame itself), minimizing their exposure at height and beneath the arch and thereby enhancing safety.
• 4–5 on-site operators; staffing is limited.

The construction method is highly adaptable.

• Meets the installation and construction requirements for multiple arch frames under the full-face tunneling method.
• Meets the construction requirements for installing multiple arch frames under the step-by-step method.
• Meets the installation and construction requirements of multiple arch frames under the core soil retention method.

Focused on human-centered design

• The fuselage offers ample internal access space, facilitating maintenance.
• The design incorporates two wireless remote controls for operation.
• The vehicle comes standard with three inverter‑type DC welders, reducing auxiliary work time.

Focused on industrial design

• The primary color scheme draws from the Hunan Qili family palette—industrial yellow and Qili gray—resulting in a sleek, sophisticated aesthetic. High‑quality paint with excellent adhesion ensures the finish remains fresh and vibrant over time.

Accessibility

• The left and right working arms adopt a modular design in which robotic grippers detach the suspended basket, minimizing the time construction workers spend inside the basket. Meanwhile, during mesh‑welding operations, these arms work in tandem with the centrally fixed basket to enable simultaneous welding of multiple baskets, thereby reducing welding time to a minimum.
• The suspended basket also features the following auxiliary functions: drilling anchor holes for steel arch supports, installing anchor mesh and rock bolts, welding, charging explosives, surveying, addressing under-excavation, and working on ventilation ducts, among others.

Professional chassis design

• China’s first arch‑type vehicle features an innovative integrated rock‑drilling chassis design, with a front box‑type and rear I‑beam frame that delivers high strength and excellent rigidity—rock‑solid during operation and safe and durable on the road.
• All‑terrain chassis design, four‑wheel drive, bidirectional operation, excellent cross‑country capability, and puncture‑resistant tires—meeting the demanding pavement conditions of tunnel construction while ensuring quick and convenient equipment relocation and transportation.
• Multi‑speed, one‑button electric transmission (Aerospace Power) offers easy, intuitive operation and shifting, while delivering reliable, long‑lasting performance.

Safety and Environmental Protection

• The diesel–electric hybrid power system provides dual redundancy for construction operations, ensuring high reliability. The electric motor delivers safe, energy‑efficient, and environmentally friendly performance with low noise levels. When grid power is unavailable or voltage is unstable, the diesel engine can seamlessly take over, without disrupting the project schedule.

Product Specifications

Overall Parameters