What are the requirements for anti-corrosion of waveform guardrails on the Luzhou Expressway in Sichuan?

Description :

The anti-corrosion requirements for waveform guardrails are mainly based on the highway project in Luzhou, Sichuan Province GB/T 18226 "Technical Conditions for Anti corrosion of Steel Components in Highway Traffic Engineering"Execution. Considering the environmental characteristics of "humid, hot, rainy, and industrial atmosphere" in Luzhou, the current mainstream solution isHot dip galvanizing (single coating)Some special road sections will adoptGalvanized+spray painted (composite coating).

1、 The mainstream solution for Luzhou Expressway: hot-dip galvanizing (single coating)

This is the most commonly used and cost-effective solution for the Sichuan Expressway (including the Luzhou section), and it needs to be strictly implemented GB/T 18226-2015 (Transition Period Reference 2025 New Standard)The "600g/㎡" high zinc layer standard.

Attention: The new national standard GB/T 18226-2025, which will be implemented from March 2026, has officially increased the zinc coating of the main components from 275g/㎡ to 600g/㎡. The newly built or expanded highways in Luzhou (such as the G76 Xiamen Chengdu Expressway Luzhou section and the G4215 Rongzun Expressway Luzhou section) have been inspected and accepted according to this high standard.

2、 Special section plan: hot-dip galvanizing+spray coating (composite coating)

If the road section is close to a chemical plant, a thermal power plant, or located in a high humidity canyon area, the design will require a "double coating" to extend the service life to 20 years.

• Inner layer (galvanized): ≥ 275 g/㎡ (approximately 39 μ m)
• Outer layer (spray coating): ≥ 76 μ m (polyester coating)
• Fasteners: Galvanized ≥ 350g/㎡, the outer layer does not require spraying

3、 Production suggestions for Guanxian Longbang Transportation Facilities Co., Ltd

What you care aboutGuanxian LongbangAs a source manufacturer in Shandong, when undertaking orders from Luzhou Expressway, it is important to pay attention to:

1. Strictly control the zinc layer: Production must be organized according to "600g/㎡" and third-party testing reports (including uniformity testing) must be provided. The Luzhou Quality Supervision Station conducts extremely strict spot checks on incoming materials from outside the province.
2. Bolt matching: Do not ignore fasteners. If the galvanized amount of the bolts is insufficient (such as electroplating only up to 120g/㎡), it is prone to rusting during the rainy season in Luzhou, which will result in the entire batch of guardrails failing the acceptance inspection.
3. Logistics protection: As the journey from Shandong to Luzhou is long, it is necessary to package it with "corner protection+wrapping film" to avoid scratching the zinc layer during transportation and affecting the salt spray test results.

4、 Reminder for your acceptance

1. Refer to the drawing code: Luzhou Expressway drawings are usually marked with "Gr-A-4E" or "Gr-A-4C", where "E" represents hot-dip galvanizing and "C" represents composite coating. Be sure to verify before placing an order.
2. Reject "non-standard": There are "450g/㎡" or "semi zinc" products on the market, which are strictly prohibited from being used for the Luzhou Expressway project, otherwise they will not pass the acceptance of the Sichuan Provincial Department of Transportation Quality Supervision Station.
3. On site inspection: Carry a magnetic thickness gauge with you and randomly measure the zinc layer of the guardrail board on site. If the main component is below 84 μ m (about 600g/㎡), it can be rejected.

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