Bridge and infrastructure projects demand rebar processing equipment that can handle large diameters, tight tolerances, and high output without sacrificing consistency. The choice between a dedicated straightening-cutting-stirrup line, a CNC forming machine, or a vertical bending center depends on the mix of bar sizes, the complexity of shapes, and the required daily tonnage. This comparison examines three Gongda models — the GDSKTZW-6M-25 straightening-cutting-stirrup line, the GDWQ4-15A CNC rebar forming machine, and the GDLWZX-32 vertical rebar bending center — across cost, quality, lead time, and customization. All three are manufactured by Hefei Oupula Electromechanical Technology Co., Ltd (工达/Gongda) under ISO 9001:2015 (GB/T 19001-2016) certification.
Comparison Table: Cost, Quality, Lead Time, Customization
| Dimension | GDSKTZW-6M-25 Straightening-Cutting-Stirrup Line | GDWQ4-15A CNC Rebar Forming Machine | GDLWZX-32 Vertical CNC Rebar Bending Center |
|---|---|---|---|
| Primary function | Straightening, cutting, and five-head stirrup bending in one line | High-speed forming of stirrups and shaped bars, single and double line | High-precision bending of large bars with automated positioning |
| Bar diameter range | Straightening: 4–15 mm | Single-line: 4–12 mm (HRB400); double-line: 4–10 mm (HRB400) | Ф10–Ф32 mm |
| Key capacity | Straightening speed: 0–80 m/min; stirrup forming: 5–8 s | Max pulling speed: 100 m/min | Max stirrup outer size: 11 m; min stirrup outer size: 500 mm |
| Tolerance | Side length ±2 mm; angle ±1°; straightening ±5 mm | Not specified | Bending angle ±1°; bending length ±1 mm |
| Installed power | 20.5 kW total | 15 kW + 5.5 kW | Bending: 4.4 kW × 2; travel: 1.8 kW × 2 |
| Automation features | VFD drive, hydraulic cutting, pneumatic head locking | Pneumatic extension, automatic clamping | CNC automated positioning |
| Typical lead time | In stock · 5 units ready · dispatch within 3 days | In stock · 5 units ready · dispatch within 3 days | In stock · 5 units ready · dispatch within 3 days |
| Customization | Quoted for your configuration — send bar sizes and output | Quoted for your configuration — send bar sizes and output | Quoted for your configuration — send bar sizes and output |
| Best for | Shops needing combined straightening, cutting, and stirrup bending | High-volume stirrup production with mixed small diameters | Large-diameter bending for bridge cages, pile reinforcement, and infrastructure |
Deep Dive: Matching Machine Capability to Infrastructure Demands
Bridge construction typically involves two distinct rebar processing streams: small-diameter stirrups and ties for columns, beams, and deck slabs, and large-diameter bars for pile cages, pier reinforcement, and foundation mats. The GDSKTZW-6M-25 straightening-cutting-stirrup line addresses the first stream by integrating three operations. It accepts bar from 4 to 15 mm, straightens at speeds up to 80 m/min with a straightening tolerance of ±5 mm, and then cuts hydraulically before bending stirrups on five heads. Stirrup forming takes 5–8 seconds per piece, with side length tolerance of ±2 mm and angle tolerance of ±1°. Minimum stirrup side inner dimension is 130×130 mm. The line uses a variable-frequency drive and pneumatic automatic locking for the bending heads, which reduces setup time when switching between stirrup sizes. Total installed power is 20.5 kW.
For higher-volume stirrup production where bars stay in the smaller range, the GDWQ4-15A CNC rebar forming machine offers single-line capacity for 4–12 mm Grade III threaded rebar (HRB400) and double-line capacity for 4–10 mm. Maximum pulling speed is 100 m/min, and the machine supports a maximum bending angle of 0–180°. It includes pneumatic extension and automatic clamping. The bending axis sits 1180 mm above the floor, and overall dimensions are 4150 mm (L) × 1220 mm (W) × 2040 mm (H). Motor power is 15 kW + 5.5 kW. This machine is suited to precast plants and fabrication shops that need fast changeover between stirrup patterns and can run two lines simultaneously for smaller diameters.
Where infrastructure projects require large-diameter bending — such as bridge pile cages, tunnel segment reinforcement, or heavy foundation mats — the GDLWZX-32 vertical CNC rebar bending center handles bars from Ф10 mm to Ф32 mm. It achieves a bending angle range of -120° to 180° with accuracy of ±1° and bending length accuracy of ±1 mm. Maximum stirrup outer size is 11 m, and minimum stirrup outer size is 500 mm. Power configuration is 4.4 kW × 2 for bending and 1.8 kW × 2 for travel. The machine footprint is 12 m × 2.1 m × 1.6 m. Automated positioning reduces manual handling of heavy bars, which is a common bottleneck in bridge fabrication yards.
Cost, Quality, and Lead Time Considerations
Cost for all three models is quoted on request based on configuration. Buyers should provide bar diameters, required shapes, and daily output targets to receive an accurate quotation. Because all three machines are in stock — 5 units ready for each — dispatch can occur within 3 days. This reduces the lead time risk that often accompanies custom-built equipment. Quality is backed by ISO 9001:2015 (GB/T 19001-2016) certification, and the manufacturer, Hefei Oupula Electromechanical Technology Co., Ltd, operates under the Gongda brand. For export orders, FOB terms are typical, and buyers should confirm voltage, frequency, and plug type for their region.
Customization is available across the range. The GDSKTZW-6M-25 can be configured for specific stirrup sizes and straightening lengths. The GDWQ4-15A can be set up for single or double line operation. The GDLWZX-32 can be programmed for complex bend sequences. All models are quoted for your configuration — send bar sizes and output to receive a tailored offer.
Who Should Pick What
Choose the GDSKTZW-6M-25 straightening-cutting-stirrup line if your bridge or infrastructure project requires a single machine to straighten, cut, and bend stirrups from 4–15 mm bar, and you value an integrated workflow with VFD straightening and hydraulic cutting. It is well-suited to fabrication shops that supply both straight bars and stirrups to bridge decks and approach slabs.
Choose the GDWQ4-15A CNC rebar forming machine if your production is dominated by small-diameter stirrups and shaped bars, and you need high pulling speed (up to 100 m/min) with the option of double-line operation. This machine fits precast concrete plants and steel service centres that process large volumes of 4–12 mm HRB400 rebar.
Choose the GDLWZX-32 vertical CNC rebar bending center if your infrastructure work involves large-diameter bars (10–32 mm) for bridge piles, pier cages, or heavy foundations, and you require high accuracy (±1° angle, ±1 mm length) with automated positioning. It is the appropriate choice for bridge fabrication yards and infrastructure contractors that handle big bar diameters and complex bend geometries.
For all three models, confirm your required bar diameter range, daily output, and bend shapes before requesting a quotation. The manufacturer offers configuration-specific pricing and can dispatch from stock within 3 days.