LYGL-350D Stirrup Cage Welding Machine Enhances Reinforcement Production for Bridge and Tunnel Projects

The Stirrup cage welding machine LYGL-350D is a fully automatic, PLC-controlled reinforcement fabrication system built specifically for large-scale bridge and tunnel projects. Developed by Shandong Zhongji Luyuan Machinery Co., Ltd., this machine addresses real production challenges — high labor costs, inconsistent weld quality, and slow output cycles — that affect contractors working under tight construction schedules. With a production rate of 24 sections per 10-hour shift and a single-operator setup, the LYGL-350D delivers measurable efficiency gains for infrastructure teams that cannot afford delays.

Understanding How the LYGL-350D Stirrup Cage Welding Machine Works

Automated Welding Mechanism

With PLC logic control and a gas-shielded welding process, the LYGL-350D does its job. It automatically feeds stirrup bars with a diameter of φ6 mm to φ12 mm and main bars with a diameter of 10 mm to 20 mm into the forming station. After that, the machine puts together and welds the whole cage in one continuous pass, so there is no need to move anything by hand. This one-pass making method gets rid of the common joint misalignment that happens when manufacturing is done by hand.

PLC and Touch Screen Control System

A touch screen interface on the operator console lets the technician see all of the welding parameters, cage dimensions, and cycle status. It controls the speed of rotation, the distance between the stirrups (at least 30 mm), and the timing of the welding all at the same time. The cage's width can be anywhere from 150 mm to 350 mm, and the length can be changed from the usual 6 m. One trained operator can do the whole production cycle, which cuts down on the number of people needed on busy job sites by a large amount.

Power and Footprint Specifications

380V, 50Hz, 3-phase power is what the machine needs to work. It has a total power rate of 14.5 KW and a welding power output of 100 KW. It stays at or below 0.8 MPa for air supply pressure. The equipment takes up an area of 16 m2 x 3 m, which is small enough to fit in most precast yard plans and covered manufacturing workshops. The high-strength steel frame construction keeps vibrations low during high-speed operation, so every cage that is made stays the same size.

Benefits of Using LYGL-350D in Bridge and Tunnel Reinforcement Production

For structures to work, bridge piers, tunnel linings, and high rail columns all need stirrup cages that are carefully made. When you make something by hand, there are things that can go wrong, like uneven spacing, weak welds, and geometry that isn't straight, which can lead to extra work and safety issues. These factors are taken out of the process by the LYGL-350D.

Here are the main ways this machine helps with production on infrastructure job sites:

• Single-pass cage forming: The machine produces one complete stirrup cage per cycle, with accurate angles, consistent stirrup spacing, and square geometry. Deformation and twisting are eliminated because the cage is held and welded under controlled mechanical tension throughout the process.
• High output per shift: At 24 sections per 10-hour shift (6 m per section), a single LYGL-350D unit can supply enough cages to keep a mid-sized bridge pier or tunnel segment on schedule without bottlenecks at the fabrication stage.
• Labor cost reduction: One operator manages the full cycle. Compared to a manual team of four to six workers producing the same volume, the labor cost differential over a 12-month project is substantial.
• The Stirrup cage welding machine LYGL-350D offers configurable cage geometry: it handles triangular, rectangular, and special-shaped stirrup profiles. Main bar count ranges from 3 to 6 pieces, and minimum main bar spacing is 100 mm. These parameters cover most column and beam hoop specifications used in highway and rail construction.

These benefits cut down on two of the highest costs in making reinforcements: the time it takes to work with the materials and the time it takes to fix them. For contractors who are in charge of multiple infrastructure packages at the same time, the efficiency gain is spread out over the whole project portfolio.

LYGL-350D Versus Competitors: Making an Informed Procurement Decision

Production Speed Comparison

The LYGL-350D can rotate up to 15 times per minute and weld 20 to 30 joints per minute, depending on the diameter of the rebar. The 350D is better than older types like the LYGL-300D because it has a wider range of cage diameters and more welding power, which makes it better for heavy-section structural uses.

Weld Quality and Dimensional Accuracy

Gas-shielded welding makes joints that are cleaner and stronger than regular resistance spot welding. Each cage comes out of the machine with exact measurements and standard angles. This is called "square geometry," and it makes installation easier on-site. Weld shear strength meets structural requirements for reinforced concrete applications, as shown by independent load testing against GB/T 1499.2 standards.

Procurement Value and After-Sales Support

Zhongji Luyuan has worked on infrastructure projects in China with China Railway, China Communications Construction, and China State Construction. They have also sent equipment to almost 100 other countries. This track record helps buyers feel confident. The company helps with installation, trains operators, provides extra parts, and has an IoT-enabled remote diagnostics module that lets technical staff handle system alerts without having to wait for service calls.

Maintenance, Troubleshooting, and Safety Guidelines for LYGL-350D

Routine Maintenance Schedule

The machine works at its full capacity because it is repaired every day and once a week. To keep their conductivity and uniform weld quality, welding electrodes need to be checked and dressed every 500 hours of use. The user instructions should be used to determine how often to lubricate moving parts, clean the welding station, and check the pneumatic pressure. A structured maintenance log lowers the chance that production will stop without warning during busy periods.

Diagnostic System and Troubleshooting

For common errors, the PLC system of the Stirrup cage welding machine LYGL-350D sends out error codes with steps on how to fix them. The built-in IoT module lets you do remote diagnostics and software changes. This is especially helpful for projects that are far away from where expert support can be quickly sent. Most common problems, like sensor misreads, pressure changes, and feed problems, can be fixed by the person working on-site using the touch screen interface, without help from someone else.

Safety and Compliance Standards

The LYGL-350D is certified by CE and meets the quality standards of ISO 9001. As part of operational safety protocols, the three-phase power supply must be properly grounded, the air pressure must be kept at or below 0.8 MPa, and there must be clear exclusion zones around the rotating cage while it is being made. All safety methods and emergency stop functions are taught during installation to make sure that international standards for building machinery are met.

Procuring the LYGL-350D Stirrup Cage Welding Machine: A Practical Guide

Purchasing Channels and Lead Times

Before placing an order, buyers should either go through Zhongji Luyuan's official distribution network or call the company directly to make sure they understand the configuration needs. Cage length, main bar count, and leg form settings can be changed during the order process to meet the needs of the project. This cuts down on the time needed for adjustments after delivery.

Pricing, Payment, and Bulk Orders

The machine's full level of automation, welding power, and ability to be customized are all taken into account in its price. Contractors who need to buy more than one unit for different building projects at the same time can use bulk order arrangements and project-package prices. During the quotation stage, payment terms and delivery dates are agreed upon.

Warranty and Long-Term Support

Before being sent out, each unit goes through a 48-hour continuous operation load test to make sure it works well in real-world situations. The team that works after the sale offers replacement parts, remote help through the IoT diagnostic module, and regular maintenance check-ins to make sure that the equipment stays working for as long as it's supposed to.

Conclusion

The Stirrup cage welding machine LYGL-350D is a well-designed automatic stirrup cage welding machine that helps address real production challenges in bridge and tunnel reinforcement work. Its one-pass forming cycle, single-operator setup, adjustable cage parameters, and gas-shielded weld quality make it a good choice for contractors who need to manage production volume and schedule pressure. With Zhongji Luyuan's engineering experience and global service network, the machine helps construction teams that need reliable large-scale results reduce labor costs and increase production speed.

FAQ

What is the maximum production output of the LYGL-350D?

Every 10-hour shift, the machine makes 24 pieces, and each one is 6 meters long. The length of the cage can be changed from this basic configuration to fit the needs of a particular job.

Can the LYGL-350D handle different stirrup shapes?

Yes. The machine can handle stirrup profiles that are triangular, rectangular, or have other unique shapes. The width of the cage can be anywhere from 150 mm to 350 mm, and the CNC control system lets you change the parameters between runs of production.

How many operators does this machine require?

From the touch screen console, one trained operator runs the whole production process. During the shift, this one-person job includes feeding, welding, and keeping an eye on the cage output.

Does the machine support remote diagnostics?

Yes. The LYGL-350D has an IoT module that lets you fix problems and update software from afar, which cuts down on downtime at places where you can't get technical help right away.

What training and after-sales support does Zhongji Luyuan provide?

On-site installation, operator training, and ongoing expert help are all things that Zhongji Luyuan offers. The team that helps with maintenance and spare parts after the sale also makes sure that equipment stays in working order during long project cycles.

Request a Quote for the LYGL-350D Stirrup Cage Welding Machine

Zhongji Luyuan is ready to help with your project if you need a reliable Stirrup cage welding machine LYGL-350D provider with extensive infrastructure experience. The LYGL-350D has been used by important construction companies and has been exported to almost 100 countries around the world. Contact our expert team right away to get a quote and setup tailored to your job. To begin your meeting, go to shandongluyuan.com or email sales2@shandongluyuan.com.

References

1. American Concrete Institute. ACI 318-19: Building Code Requirements for Structural Concrete. American Concrete Institute, 2019.

2. American Welding Society. AWS D1.4/D1.4M: Structural Welding Code — Reinforcing Steel. American Welding Society, 2018.

3. Federal Highway Administration. Steel Bridge Design Handbook: Structural Behavior of Steel. U.S. Department of Transportation, 2015.

4. International Federation for Structural Concrete (fib). fib Model Code for Concrete Structures 2010. Ernst & Sohn, 2013.

5. ASCE. Manual of Engineering Practice No. 127: Structural Fire Engineering. American Society of Civil Engineers, 2018.

6. Construction Industry Institute. Automation and Robotics in Construction: Current State and Future Prospects. Construction Industry Institute, 2021.