A Powerful Tool for Bridge Construction: An In-Depth Analysis of Shandong Xingyuan Machinery's QC Type Double-Girder Overhead Crane

Product Definition: The "Stabilizing Pillar" for Bridge Construction Sites

The QC type double-girder overhead crane is a specialized lifting device designed by Xingyuan Machinery specifically for heavy-component lifting scenarios such as bridge construction sites, precast beam yards, and water conservancy projects. Based on the standard double-girder overhead crane, this model has been specifically optimized to address the characteristics of bridge construction, including large component volumes, high alignment precision requirements, and complex operating environments.

Core Positioning:

In simple terms: if the QD type is the "all-purpose handler" in industrial workshops, then the QC type is the "stabilizing pillar" on bridge construction sites. When you need to lift precast beam segments weighing tens or even hundreds of tons and position them with precision, the QC type is the most trustworthy choice.

II. Core Technologies: Four Dimensions Forging the "Bridge Construction Expert"

High-Stability Design: The "Hydraulic Anti-Sway" Advanced Technology

One of the greatest challenges on bridge construction sites comes from wind loads and large-amplitude load sway. When a crane lifts a precast beam segment with a large wind-catching area, the force of the wind can cause the beam body to sway significantly, affecting not only alignment accuracy but also posing a serious threat to the structural safety of the crane and the safety of operating personnel.

Xingyuan Machinery's technical team has conducted in-depth research into this industry pain point and successfully developed the hydraulic anti-sway system applied to the QC type crane:

Working Principle: When large-amplitude sway occurs during the lifting process, clamping arms installed on the tower/support frame are automatically actuated by the hydraulic system. The sway energy is transmitted via hydraulic oil to an underground energy dissipation device, effectively attenuating the sway force.

Anti-Slip Protection: While absorbing sway energy, the hydraulic system is linked to an anti-slip mechanism that provides auxiliary braking to the travel wheels, preventing the crane from slipping unexpectedly when subjected to force.

Technical Effect: Significantly enhances the operational stability of the crane under adverse weather conditions, ensuring that large beam segments can be lifted and aligned smoothly and safely.

 Height-Adjustable Technology: Adapting to Diverse Construction Sites

Actual conditions on bridge construction sites often vary greatly—different projects have different pier heights, different construction methods, and restricted working spaces. To address this, Xingyuan Machinery has applied a height-adjustable structural design on the QC type crane, which has been granted a national patent (Patent Publication No. CN 222023967 U).

Technical Features:

The support section of the crane adopts a threaded lifting mechanism design, with a motor-driven screw rotation enabling precise elevation and lowering of the movable column within the fixed column.

Wide Adjustment Range: The working height of the crane can be flexibly adjusted according to the pier column heights and construction site requirements of different bridges.

Strong Scenario Adaptability: Whether for aerial work on elevated bridges or ground-level work in precast beam yards, it can be quickly adjusted to the optimal working posture.

Application Value: This design enables the QC type crane to flexibly adapt to different working condition requirements, greatly improving equipment utilization—the same unit can be reused on different projects and construction sites of varying heights.

 Multiple Structural Configurations: Precisely Matching Different Construction Methods

Bridge construction involves diverse types of components and varying lifting techniques. Xingyuan Machinery's QC type crane can be configured in multiple structures based on user requirements:

(1) Single-Hook vs. Double-Hook

Single-point lifting of large precast beams: Uses a dual-hook coordinated control system; the two hooks achieve synchronized lifting via electrical interlocking and can also be controlled independently.

Lightweight operations for small to medium components: A single-hook configuration can be selected according to actual needs, reducing costs.

Technical assurance: Whether single or double hook, both configurations are equipped with high-precision load monitoring and synchronous control functions to ensure the lifting process is smooth and reliable.

(2) Gantry vs. Overhead

Gantry Structure: Both side legs stand on the ground, traveling along ground-level rails; suitable for open sites such as precast beam yards and outdoor storage yards.

Overhead Structure: Both side legs are mounted on elevated rails; suitable for beam assembly and component transfer within fixed spans.

Flexible Selection: Can be flexibly chosen based on the spatial conditions and process requirements of the construction site.

(3) Multiple Hoisting Mechanism Configurations

QC Type (General Purpose): Adopts a double-girder structure; an electric hoist or winch-type hoisting mechanism can be selected according to tonnage, suitable for a wide range of medium to large tonnage lifting operations.

QC-L Type (Lightweight): Suitable for rapid transfer of small to medium components.

QC-Y Type (Metallurgical/Heavy-Duty): Equipped with dual brakes, suitable for extreme heavy tonnages and high-temperature working conditions.

 Intelligent Limit Protection: A "Smart Brain" Safeguarding Operations

In bridge construction, collision between the lifted load and the main girder is one of the common operational risks—especially under conditions of restricted lifting height or narrow operating spaces. Xingyuan Machinery has equipped the QC type crane with a multi-sensor fusion intelligent limit system, which has been granted a national patent (Patent Publication No. CN 222556409 U).

Technical Features:

Mechanical + Electronic Dual Limit Protection: By combining mechanical buffer devices such as rubber pads, pressing plates, and compression springs with an electronic button trigger mechanism, the circuit is automatically cut off when the load is lifted to a dangerous height.

Intelligent Warning: Real-time monitoring of the positional relationship between the load and the main girder; the system automatically decelerates and activates audible and visual alarms when approaching the limit.

Collision Damage Prevention: Effectively prevents the load from colliding with the main girder due to operational errors, protecting both the equipment and the material.

Application Value: This intelligent limit system significantly reduces the risk of accidents caused by operational errors, providing a safer operating experience for bridge construction.