Dratnage Pit / Trench Cover
1. Grating trench cover used in walkway, carriageway, courtyard or other constructions. Used as cover for drainage trench, wireway, subway, air pit, etc. Hot-dip-galvanizing for surface treatment.
2. Grating trench cover composed by fixed fram & removable grating cover. It can be noted as GT & GU in terms of their different structures.
3. Grating pit cover used in catch basin, sand sediment trap, draining well, & sink hole for road, park & other civil projects. It’s generally designed as the evertile & its start-stop angle is 110°. The grating with pin joint is not only good to guard against theft but also simplify the construction procedure.
Class of Loading for Drainage Trench/Pit Cover
|
Class of Load |
Fully Laden(kg) |
Back Single-wheel Load(KN) |
Wheel-pressure Area a×b (mm2) |
|
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 |
Learn Steel Grating
|
Steel Grating Standard |
Steel Material Standard | Hot galvanizing Standard |
| China: YB/T4001.1-2007 | China: GB700-2006 | China: GB/T13912-2002 |
| U.S.A: ANSI/NAAMM | U.S.A: ASTM(A36) | U.S.A: ASTM(A123) |
| U.K: BS4592 | U.K: BS4360(43A) | U.K: BS729 |
| Australia: AS1657 | Australia: AS3679 | Australia: AS1650 |
1. Bearing bar pitches may be 12.5 to 15, 20, 30,32.5,34.3, 40,60mm,of which 30mm & 40mm are recommended.
2. Cross bar pitches may be 38,50,60, to 100mm, of which 50mm & 100mm are recommended.
3. Sign of the shape of bearing bars. F - Plain style (may be omitted in the symbol of steel grating); S - Serrated style; I – I-shape style
4. Sign of surface treatment. G - Hot galvanizing (may be omitted in the symbol of steel grating); P - Painted; U – untreated
FIELDS OF APPLICATION :
1. Light chemical industry/Petro-chemistry/Machinery industry/Textile chemistry/Port engineering
2.Oil and grease chemistry/Agriculture husbandry/Horticulture/Steel industry/Waste disposale
3.Food processing/Aquatic breeding/Fertiliazer industry/Phamaceutical industry/Parking lots
4.Cement plants/Oil refinery/Mining and refinery/Power plants/Public utilties
5.Marine engineering/Shipbuilding/Construction material industry/Defense projects/Airport projects
6.Water plants/Sewage disposal/Paper and pulp industry/Construction industry/Transportation industry/Automotive industry
COMMON USES OF GRATING :
Flooring Catwalks Mezzanines/decking Stair tread Fencing
Vault bin floors Ramps Docks Trench covers Window and machinery safe guards
Entilation screens Storage racks Suspended ceiling Drainage pit cover Wash racks
Type of Steel Grating
Comparison of Feature:
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 |
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Plain:One of the most widely used grating, available for flooring, sidewalk, dranage pit cover, stair tread, etc.
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Serrated:Better non-skid property & safety comparing to plain grating.
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I-shape:Lighter, more economical and practical comparing to plain grating.
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