At the intelligent prefabricated beam factory of the Wuhan North Sixth Ring Road project in China, a steel bar is fed into a machine. Robotic arms flip with the agility of dancers, and in just 60 seconds, a single bar is continuously bent into a multi-layered, standardized three-in-one stirrup with millimeter-level precision. This is not magic, but the daily operation of the three-in-one integrated stirrup bending workstation independently developed by the First Company of China Construction Third Engineering Bureau (CSCEC). It is fundamentally rewriting the technological landscape of rebar processing, a traditionally labor-intensive task.
The "Bottleneck" Process in Rebar Processing
Prefabricated beams are the "building blocks" of the construction world—beam components pre-manufactured in a factory and assembled directly on-site. Stirrups are the "core skeleton" of these beams, supporting the entire structure. However, stirrup fabrication has long relied on manual labor: traditional methods require multiple stirrups to be overlapped and welded, with workers bending, cutting, transporting, and welding—a process characterized by high labor intensity, low efficiency, and difficulty in ensuring precision.
This step was once a "bottleneck" in prefabricated beam production, entirely dependent on manual operation and recognized by the industry as a gap in automated equipment. Against the backdrop of rising labor costs and increasingly stringent engineering quality requirements, the intelligent upgrade of rebar processing has become urgent.
A Revolution: From "Overlap Welding" to "Continuous Bending"
"Origami" Process: Single Rebar Formed in One Go
The core innovation of the three-in-one integrated stirrup bending workstation lies in a fundamental change in process logic. Traditional methods require multiple stirrups to be fabricated separately and then overlapped and welded. In contrast, this workstation uses a programmed trajectory to continuously bend a single steel bar into a ring-shaped, multi-layered nested form in one go, much like "origami."
This "one-shot" forming method completely eliminates the error accumulation and strength loss caused by multi-step assembly.
Three Robotic Arms in Synergy: Precision Like Dancers
The workstation consists of a bending table, a welding table, and three robotic arms (two gripping arms and one welding robot). After the gripping arms precisely position the stirrup, the welding robot performs spot welding according to a preset program. The entire process requires no human intervention, with the robotic arms flipping in coordinated synergy, controlling precision at the millimeter level.
Hard Data: Doubled Efficiency, 100% Pass Rate
This equipment delivers a convincing track record:
| Indicator | Data |
|---|---|
| Time per Unit | 60 seconds |
| Error Reduction | Approx. 60% less than traditional methods |
| Labor Replacement Rate | 70% |
| Efficiency Improvement | 2 times |
| Pass Rate | 100% |
This equipment has completely transformed the industry's perception of rebar processing as a "labor-intensive" task. Li Jingliang, head of the intelligent prefabricated beam rebar production line, explained that now, intelligent equipment plus two operators can accomplish the workload that previously required a large workforce, with a 100% pass rate for rebar cage parameters. The most amazing feature is the rotary magazine hopper, which automatically "feeds" stirrups to the robot like loading a machine gun, completely eliminating manual handling.
China's First: Filling a Gap in Automation Equipment
The workstation is connected downstream to an intelligent rebar cage welding workstation—180 stirrups and 60 horizontal main bars are automatically assembled into a rebar cage, with a laser weld seam tracking system operating without human intervention, and robotic arms precisely positioning weld points. This system is the first of its kind in China, filling a gap in automated equipment for prefabricated beam rebar, and accelerating production pace by 30%.
From "Single Machine Breakthrough" to "Full-Process Intelligent Manufacturing"
The three-in-one integrated stirrup bending workstation is not an isolated technological node but a core component of CSCEC's second-generation intelligent prefabricated beam factory. The entire factory achieves full-process digital control through an integrated "design-management-production" platform:
Integration of BIM models with production data: Enabling automated, digital, visual, and intelligent management
MES management system: Automatically generating production plans and monitoring progress in real-time
CAM industrial control system: Connecting interfaces of intelligent equipment across the factory for comprehensive, full-element, and multi-disciplinary smart control
This platform breaks down data silos between design, management, and production in prefabricated beam manufacturing, achieving full-process data connectivity and collaboration.
From "Wuhan Sixth Ring Road" to "Industry Standard"
Validated in National Key Projects
This intelligent factory is currently in use at the Wuhan Sixth Ring Road project. The Wuhan Sixth Ring Road is being built to a six-lane, dual-carriageway expressway standard, holding significant strategic importance for promoting transportation integration in the Yangtze River Economic Belt and improving the comprehensive three-dimensional transportation network layout in Hubei Province.
Furthermore, this technology has been widely applied in key projects including the Wuhan Sixth Ring Road and multiple expressways in Hubei Province. The nation's first intelligent prefabricated beam rebar production line has been officially put into operation in Wuhan.
From "On-Site Manufacturing" to "Factory-Based Intelligent Manufacturing"
The industry significance of this technology lies in driving a paradigm shift in rebar processing from "decentralized on-site operations" to "centralized factory-based intelligent manufacturing." The intelligent factory is "mobile, following the project," allowing rapid deployment across different projects to achieve standardized production and economies of scale.
Labor Replacement and Quality Revolution
Against the backdrop of a growing labor shortage in the construction industry, this technology achieves a 70% labor replacement rate and a 100% pass rate, fundamentally solving the quality control issues inherent in "experience-based, labor-intensive" rebar processing. With error reduction of approximately 60%, millimeter-level precision is becoming the new industry standard.
Providing a Replicable Model for Industry Intelligent Upgrade
From single-machine equipment to intelligent factories, from the Wuhan Sixth Ring Road to Hubei expressways, CSCEC's intelligent rebar processing technology system has formed a replicable and scalable technical solution. As national requirements for building prefabrication rates are gradually implemented, this technology is poised to evolve from "corporate innovation" to "industry standard."
Bidding Farewell to the "Labor-Intensive" Era of Rebar Processing
Rebar processing is one of the most fundamental and traditional processes in construction engineering. This breakthrough by CSCEC's First Company redefines the production method of this millennia-old process with a 60-second "origami magic"—transitioning from "human wave tactics" to "machine-based intelligent manufacturing," and from "experience-based judgment" to "data-driven decision-making."
As Li Jingliang, head of the intelligent prefabricated beam rebar production line, said, "This used to be a 'labor-intensive job.'" Now, intelligent equipment is turning "labor-intensive work" into "skilled technical work." When a single steel bar is precisely bent into a standardized three-in-one stirrup in 60 seconds, and millimeter-level precision becomes the norm, the intelligent transformation of China's construction industry is quietly taking place at the most fundamental process level—and this is precisely the solidest foundation for industry change.