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- Bearing bars up to 150 × 8 mm
- 8 × 8 mm square cross bars at 100 mm
- Safe loads to over 1000 kPa on short spans
- 5.0 and 7.5 kPa span tables
- For forklifts, trucks and heavy equipment
Where heavy-duty grating is used
Heavy-duty grating takes loads that light walkway grating cannot: forklift and truck wheels, pallet traffic, boiler houses, compressor rooms, heavy equipment floors, loading docks and trench crossings. Deeper and thicker bearing bars carry the load, and heavier square cross bars spread wheel loads to neighbouring bars.
For trench and pit systems with frames see WS trench covers and WS drainage pit covers.
Recommended spans – 5.0 and 7.5 kPa
| WS code | Bar (mm) | Pitch 30 | Pitch 40 | Pitch 60 |
|---|---|---|---|---|
| WS-G255 | 25 × 5 | 1350 / 1220 | 1250 / 1130 | 1130 / 1020 |
| WS-G325 | 32 × 5 | 1620 / 1460 | 1510 / 1360 | 1360 / 1230 |
| WS-G405 | 40 × 5 | 1920 / 1730 | 1780 / 1610 | 1610 / 1460 |
| WS-G455 | 45 × 5 | 2090 / 1890 | 1950 / 1760 | 1760 / 1590 |
| WS-G505 | 50 × 5 | 2270 / 2050 | 2110 / 1910 | 1910 / 1720 |
| WS-G555 | 55 × 5 | 2440 / 2200 | 2270 / 2050 | 2050 / 1850 |
| WS-G655 | 65 × 5 | 2760 / 2490 | 2570 / 2320 | 2320 / 2100 |
| WS-G755 | 75 × 5 | 3080 / 2780 | 2860 / 2590 | 2590 / 2340 |
| WS-G756 | 75 × 6 | 3220 / 2910 | 3000 / 2710 | 2710 / 2440 |
Heavy-duty load table
| Type | Bar (mm) | kg/m² | U 600 | U 1000 | U 1400 | U 2000 | U 2400 | U 3000 | C 1000 (kN/m) | D 1000 (mm) |
|---|---|---|---|---|---|---|---|---|---|---|
| WS-G1508/40/100 | 150 × 8 | 284.9 | 2833 | 1020 | 520 | 255 | 177 | 113 | 510 | 1.15 |
| WS-G1308/40/100 | 130 × 8 | 247.6 | 2128 | 766 | 390 | 191 | 133 | 85 | 383 | 1.33 |
| WS-G1208/40/100 | 120 × 8 | 229.0 | 1813 | 653 | 333 | 163 | 113 | 72 | 326 | 1.44 |
| WS-G1008/40/100 | 100 × 8 | 191.7 | 1259 | 453 | 231 | 113 | 78 | 50 | 226 | 1.73 |
| WS-G908/40/100 | 90 × 8 | 173.1 | 1020 | 367 | 187 | 91 | 63 | 40 | 183 | 1.92 |
| WS-G808/40/100 | 80 × 8 | 154.4 | 805 | 290 | 148 | 72 | 50 | 32 | 145 | 2.16 |
| WS-G758/40/100 | 75 × 8 | 145.1 | 708 | 255 | 130 | 63 | 44 | 28 | 127 | 2.31 |
| WS-G756/30/100 | 75 × 6 | 140.1 | 708 | 255 | 130 | 63 | 44 | 28 | 127 | 2.3 |
| WS-G756/40/100 | 75 × 6 | 110.1 | 531 | 191 | 97 | 47 | 33 | 21 | 95 | 2.3 |
| WS-G706/30/100 | 70 × 6 | 131.1 | 617 | 222 | 113 | 55 | 38 | 24 | 111 | 2.47 |
| WS-G706/40/100 | 70 × 6 | 103.2 | 462 | 166 | 85 | 41 | 28 | 18 | 83 | 2.46 |
Wheel loads are not uniform loads – for vehicles and forklifts the panel is checked for the wheel load, tyre contact area and dynamic factor of the project code (AASHTO, AS 3996 / AS 5100, EN 124 or EN 1991).
Design and compliance
- United States – heavy grating per ANSI/NAAMM MBG 532; road loading AASHTO H-20 / HS-20 or HL-93.
- Australia – AS 3996 class A to G for covers and grates; AS/NZS 1170.1 for floors.
- Europe – EN 124 classes A15 to F900 for covers; EN 1991-1-1 for floors.
- Covers that must conform to a class by test are fabricated to a tested design or load-tested as specified.
Tiêu chuẩn và yêu cầu theo thị trường
Các quy chuẩn mà World Steel áp dụng để thiết kế, gia công và lập hồ sơ cho sản phẩm này – cùng các yêu cầu chính về hình học và tải trọng tại từng thị trường.
Hoa Kỳ
- AASHTOVehicle loading H-20 / HS-20, HL-93
- ANSI/NAAMM MBG 532Heavy-Duty Metal Bar Grating Manual
- ACI 318 Ch. 17Anchoring to concrete
- AWS D1.1Structural welding code – steel
- ASTM A123Hot-dip galvanized coatings
- Road-trafficked covers
- AASHTO H-20 / HS-20 or HL-93 commonly specified
Úc / NZ
- AS 3996-2019Access covers and grates
- AS 5216Fastenings in concrete
- AS/NZS 1554.1Structural steel welding
- AS/NZS 4680Hot-dip galvanized coatings
- Load class
- Class A to G by location (AS 3996-2019)
Châu Âu
- EN 124Gully tops and manhole tops for vehicular and pedestrian areas
- EN 1992-4Design of fastenings for use in concrete
- EN ISO 1461Hot-dip galvanized coatings
- Load class
- A15, B125, C250, D400, E600 or F900 (EN 124)
Nội dung chỉ mang tính tham khảo – chỉ dẫn kỹ thuật của dự án, phiên bản quy chuẩn được áp dụng và cơ quan có thẩm quyền là căn cứ quyết định.
Hoàn thiện bề mặt
| Hoàn thiện bề mặt | Tiêu chuẩn / ghi chú |
|---|---|
| Hot-dip galvanised (G) | ASTM A123 · AS/NZS 4680 · EN ISO 1461 |
| Paint coated (PP) | Blast or pickle + paint system to ISO 12944 / AS/NZS 2312.1 / SSPC |
| Duplex | Galvanised + paint for colour or C5 environments |
Câu hỏi thường gặp
When do I need heavy-duty grating?
When the floor carries more than about 5 kPa or any wheel load – forklifts, pallet trucks, cars or trucks – and for boiler, compressor and heavy equipment areas.
What is the heaviest WS grating?
WS-G1508/40/100: 150 × 8 mm bearing bars at 40 mm with 8 × 8 mm cross bars, about 285 kg/m².
Can heavy-duty grating be certified to EN 124 or AS 3996?
Covers can be designed to the class and, where conformity by test is required, fabricated to a tested design or load-tested at an accredited laboratory as specified.
AS/NZS 5131 CC3
EN 1090 EXC3 · CE
