Steel Gully Grate (Carbon Steel)

1. Product Overview

Steel Gully Grate is a robust carbon steel drainage grating designed for urban, industrial, and commercial applications. It effectively covers drainage channels, manholes, and trench drains while providing high load-bearing capacity for pedestrians, light vehicles, and heavy-duty trucks. Constructed from premium carbon steel (Q235B / Q355B / A36 / S275JR) and reinforced with serrated or flat bars, it ensures maximum safety, superior drainage, and long-term durability in harsh environments.

2. Technical Parameters

 

Category	Parameter	Specification / Industry Range	Engineering Notes
Material	Steel Grade	Q235B / Q355B / ASTM A36 / EN S275JR	Common structural grades for drainage covers and traffic zones.
Bearing Bars	Thickness	3 –20 mm	Selected based on channel span and design load.
Bearing Bars	Spacing	15 –100 mm	Balances drainage flow, safety, and load distribution.
Cross Bars	Type	Twisted bar or round bar	Ensures panel rigidity and load transfer.
Grate Height	Overall Depth	20 – 200 mm（or custom）	Matches common precast or cast-in channels.
Dimensions	Length	300 / 1000 mm or custom	Reduces on-site cutting and installation time.
Installation	Fixing Method	Recessed frame / bolt-down	Prevents displacement under traffic loads.
Surface Treatment	Process	Hot-dip galvanizing (≥70 μm)	Corrosion protection for outdoor and wet environments.
Load Reference	Design Load	Pedestrian to vehicle traffic	Determined by bar size, spacing, and support span.
Standards	Reference	EN 1433, ASTM A36, ISO 9001	Drainage and material compliance.
Design Recommendations	Customization	Consult engineers to determine bar spacing and thickness	Ensure maximum safety, drainage efficiency, and load distribution.
NOTE:The vehicle load is shown in the following chart, and more loads can be recommended by our technical personnel.

 

 

 

Ditch cover load rating:

Load level	Fully Laden (Kg)	Back Singlo-wheel Load(KN)	Wheel-oressure Area aXb()mm
T-25	25,000	100	200×500
T-20	20,000	80	200×500
T-14	14,000	56	200×500
T-6	6,000	24	200×240
T-2	2,000	8	200×160

 

1.GT type trench cover:

GT-type trench covers are suitable for use on roads other than highways, where traffic volume is generally low. When used as cross-ditch covers, the risk of the cover jumping up must be considered, and bolts should be used for fixing. They are suitable for trenches with supported rims (T-shaped trenches), where the rims are typically reinforced with angle steel.

 

 

GT type trench cover marking:

 

2.GU-type trench cover:

For ordinary concrete masonry trenches without rims, U-shaped trench covers are very simple and economical, requiring no special rims. For loads of T-6 and T-14, it is recommended to embed angle steel along the rim. Alternatively, prefabricated U-shaped trench blocks can be used to construct the trench, effectively preventing sewage leakage into the ground. When vehicles need to pass, GU-shaped trench covers are only suitable for side trenches.

 

GU-type trench cover marking:

 

3.GM type manhole cover:

 

 GM-type steel grating covers can be used for the covers of water supply and drainage wells, sedimentation wells, sewer wells, sewage wells, and other water supply and drainage wells, or air vents and manholes in municipal facilities such as roads and parks. GM-type steel grating covers can be designed to be coverable, and the opening and closing angle is usually 110°. Steel grating covers with hinged pins are not only theft-proof but also simplify the construction process.

 

Engineering Notes:
Carbon steel construction resists mechanical wear and supports heavy pedestrian and vehicular loads. Proper bearing bar thickness and spacing optimize drainage performance while preventing deformation. Hot-dip or electro-galvanized finishes protect against corrosion in urban and industrial environments. Custom cut, bent, or reinforced panels are available for specific manhole shapes, trench layouts, or traffic-heavy areas. Diagonal supports enhance load distribution for vehicle traffic.

3. Product Advantages

1.High Load-Bearing Capacity: Premium carbon steel ensures safe support for pedestrians, light vehicles, and trucks.

2.Durable and Corrosion-Resistant: Galvanized surfaces withstand harsh urban and industrial environments.

3.Slip-Resistant Surface: Optimized bar patterns and optional serrated surfaces reduce slip risk in wet conditions.

4.Prevents Blockages: Openings and cross bars are designed to avoid debris accumulation while maintaining drainage efficiency.

5.Customizable Design: Supports various sizes, shapes, and bar configurations for specific trench and manhole requirements.

4. Applications & Engineering Scenarios

1.Urban Road and Sidewalk Drainage: Covers manholes and trench drains for pedestrian safety and vehicle traffic.

2.Industrial Factory Floors: Supports forklifts, trucks, and machinery while ensuring effective drainage.

3.Parking Lots and Service Areas: Provides high-load safety and prevents water accumulation in heavy-traffic areas.

4.Ports and Transport Terminals: Handles heavy cargo vehicle loads while maintaining drainage efficiency.

5.Residential & Commercial Complexes: Ensures safe pedestrian access and reliable rainwater drainage.

6.Public Spaces: Parks, plazas, and transit stations with high pedestrian flow and urban drainage requirements.

5. Quality Control & Performance

1.ISO 9001-compliant production ensures consistent quality and traceability.

2.Each panel is inspected for bar thickness, spacing, weld quality, and surface finish.

3.Load tests verify performance for pedestrian, light vehicle, and truck traffic.

4.Corrosion resistance validated via coating thickness inspection and environmental exposure tests.

5.Custom QA reports available for international clients to meet local regulations and project standards.

6. Factory Customization & Engineering Services

1.Custom shapes: rectangular, trapezoidal, or irregular panels to fit any trench or manhole layout.

2.Tailored bar thickness, spacing, and surface treatment to match traffic load requirements.

3.Optional serrated or perforated surfaces for enhanced slip resistance.

4.Special cutouts for utilities, signage, or architectural features.

5.Engineering guidance for installation, load calculations, and global compliance.

7. FAQ

Q: Can carbon steel gully grates support vehicle traffic?
A: Yes. When designed with appropriate bearing bar thickness and spacing, they are suitable for cars, trucks, and industrial vehicles under defined load classes.

Q: How do these grates prevent drainage blockage?
A: Optimized bar spacing allows water to pass freely while minimizing debris accumulation, reducing maintenance frequency.

Q: Are galvanized gully grates suitable for outdoor use?
A: Hot-dip galvanized coatings provide strong corrosion resistance, making them suitable for long-term outdoor and municipal applications.

Q: Can gully grates be manufactured for curved or irregular channels?
A: Yes. Custom fabrication allows for irregular shapes, special lengths, and precise fitting to existing drainage systems.

 

In summary, Steel Gully Grate delivers exceptional durability, high load capacity, and reliable drainage for urban roads, industrial sites, ports, parking areas, and public spaces. Its galvanized carbon steel construction, customizable designs, and anti-slip options provide long-term safety, reduced maintenance, and compliance with EN 1433 and ASTM standards in demanding traffic and wet environments worldwide.