Steel Grating for Trench Cover Applications

Steel grating is widely used on the ground of passageway, roadway, courtyard and buildings as the drainage trench grating, pipeline trench cover, underground passage cover, air shaft cover, light well cover and inspection well cover. Steel grating trench cover is commonly made of fixed frame and moving steel grating plate. For further security and firmness, we can supply fasteners and anti-theft device.

Types of steel grating trench cover

  • GT type. Also called trench grate and angle frame type, it is most common seen type. It is suitable for places except for the highroad, where has light traffic. It can be divided into two different types.
    A top view and a side view of GT type steel grating trench cover.
    GT type steel grating trench cover drawing.
    • Side trench cover is installed on the edge of the lane. The bearing bar direction is perpendicular to driving direction.
    • Cross section trench cover. The bearing bar direction of cross section trench cover is same to the driving direction. When using, we should fasten the steel grating firmly with bolts and nuts to prevent grating from moving and causing accident.
    Two drawings show driving direction and grating direction of side type and cross section type.
    Difference between side trench cover and cross section trench cover.
    Several pieces of steel grating are installed on the edge of lane.
    Side trench steel grating cover.
    Steel gratings are installed on the exit of underground garage.
    Cross section trench steel grating cover.
  • GU type trench cover. Also called angle side grates, it is suitable for most trench of concrete ground. It is simple and economical. Besides, it need not special trench opening. When the steel grating trench cover used in the T-6 or T-14 grade, trench opening should be buried with angle bar for firmness and security. Except that, you can choose the specialized U shape trench. Used with steel grating trench cover, this device can prevent sewage from leaking into the ground. Moreover, this type trench cover is just suitable for side trench cover when there are vehicles passing.
    A top view and a side view of GU type steel grating trench cover.
    GU type steel grating trench cover drawing.
    A piece of hot dipped galvanized GU type steel grating trench cover on the ground.
    GU type steel grating has solid edge angle bar for security.
    Several pieces of GU type steel grating are installed on the drainage trench.
    GU type steel grating trench cover is used in drainage trenches.
  • GM type. Also called box grates, it is suitable for roadway and public facilities. GM type steel grating is designed into flexible structure. One side of grating is fixed onto the frame with the other three side are flexible. The steel grating can be opened into 110° for flexibility and easy operation. Hinge pin design is anti-theft and simplify the construction process. Additional, the 50 mm cross bar pitch has excellent impact resistance performance.
    A top view and a side view of GM steel grating trench cover.
    GM steel grating trench cover drawing.
    A GM type steel grating trench cover on the white background.
    GM type grating is composed of outer frame and openable steel grating.
    Several GM type steel grating trench covers are installed edge of road with one grating opened.
    GM type grating is widely used as inspection trench cover and drainage trench cover.

Specifications of steel grating trench cover

  • Material: low carbon steel plate and sheet.
  • Surface treatment: hot dipped galvanized.
  • Bearing bar type: flat bar, serrated bar or I bar.
  • Cross bar pitch:
    • GT type: 100 mm or 50 mm.
    • GU type: 100 mm or 50 mm.
    • GM type: commonly is 50 mm.

Bearing load grade of trench cover

At different applications and road conditions, we should adopts different steel grating trench cover for security and firmness. In the following chart, we introduce the load grade type and bearing load.

Table 1: Bearing Load Grade of Trench Cover
Item Load Grade Maximum Weight of Vehicle
(kg)
Single Rear Wheel Load
(kN)
Wheel Press Area a× b
(mm2)
SGDD-01 T-25 25000 100 200 × 500
SGDD-02 T-20 20000 80 200 × 500
SGDD-03 T-14 14000 56 200 × 500
SGDD-04 T-6 6000 24 200 × 240
SGDD-05 T-2 2000 8 200 × 160
Table 2: Specifications of GT Type Steel Grating for T-2 and T-6
Trench Width
(mm)
T-2 or for Passageway T-6
Model Trench Cover Size
(mm)
Angle Frame Size
(mm)
Model Trench Cover Size
(mm)
Angle Frame Size
(mm)
100 GT2-100-20 995 × 160 × 20 40 × 25 × 5 GT6-100-25 995 × 164 × 25 40 × 28 × 3
120 GT2-120-20 995 × 180 × 20 40 × 25 × 5 GT6-120-25 995 × 184 × 25 40 × 28 × 3
150 GT2-150-20 995 × 210 × 20 40 × 25 × 5 GT6-150-25 995 × 214 × 25 40 × 28 × 3
180 GT2-180-20 995 × 240 × 20 40 × 25 × 5 GT6-180-25 995 × 244 × 25 40 × 28 × 3
200 GT2-200-20 995 × 260 × 20 40 × 25 × 5 GT6-200-32 995 × 294 × 32 56 × 36 × 4
240 GT2-240-25 995 × 304 × 25 40 × 28 × 3 GT6-240-32 995 × 334 × 32 56 × 36 ×4
300 GT2-300-25 995 × 364 × 25 40 × 28 × 3 GT6-300-38 995 × 416 × 38 70 × 45 ×7
360 GT2-360-25 99 × 424 × 25 40 × 28 × 3 GT6-360-45 995 × 440 × 45 50 × 50 × 5
400 GT2-400-25 995 × 464 × 25 40 × 28 × 3 GT6-400-50 995 × 490 × 50 56 × 56 × 6
450 GT2-450-32 995 × 544 × 32 56 × 36 × 4 GT6-450-50 995 × 540 × 50 56 × 56 × 6
500 GT2-500-45 995 × 580 × 45 50 × 50 ×5 GT6-500-50 995 × 590 × 50 56 × 56 × 6
600 GT2-600-50 995 × 690 × 50 56 × 56 × 6 GT6-600-50 995 × 700 × 55 60 × 60 × 5
Table 3: Specifications of GT Type Steel Grating for T-14 and T-20
Trench Width
(mm)
T-14 T-20
Model Trench Cover size
(mm)
Angle Frame Size
(mm)
Model Trench Cover Size
(mm)
Angle Frame Size
(mm)
100 GT14--100-25 995 × 164 × 25 40 × 28 × 3 GT20-100-25 995 × 164 × 25 40 × 28 × 3
120 GT14--120-25 995 × 184 × 25 40 × 28 × 3 GT20-120-32 995 × 214 × 32 56 × 36 × 4
150 GT14--150-25 995 × 214 × 25 40 × 28 × 3 GT20-150-32 995 × 244 × 32 56 × 36 × 4
180 GT14--180-32 995 × 274 × 32 56 × 36 × 4 GT20-180-38 995 × 296 × 38 70 × 45 ×7
200 GT14--200-32 995 × 294 × 32 56 × 36 × 4 GT20-200-38 995 × 316 × 38 70 × 45 ×7
240 GT14--240-38 995 × 356 × 38 70 × 45 × 7 GT20-240-45 995 × 320 × 45 50 × 50 × 5
300 GT14--300-45 995 × 380 × 45 50 × 50 × 5 GT20-300-50 995 × 390 × 50 56 × 56 × 6
360 GT14--360-50 99 × 440 × 50 56 × 56 × 6 GT20-360-55 995 × 400 × 55 60 × 60 × 5
400 GT14--400-50 995 × 480 × 50 56 × 56 × 6 GT20-400-55 995 × 500 × 55 60 × 60 × 5
450 GT14--450-55 995 × 550 × 55 60 × 60 × 5 GT20-450-65 995 × 590 × 65 70 × 70 × 5
500 GT14--500-60 995 × 610 × 60 65 × 65 × 5 GT20-500-75 995 × 640 × 75 80 × 80 × 5
600 GT14-600-50 995 × 750 × 75 80 × 80 × 5
Table 4: Specifications of GT Type Steel Grating for T-25
Trench Width
(mm)
T-25
Model Trench Cover Size
(mm)
Angle Frame Size
(mm)
100 GT25--100-32 995 × 194 × 32 56 × 36 × 4
120 GT25--120-32 995 × 214 × 32 56 × 36 × 4
150 GT25--150-38 995 × 266 × 38 70 × 45 × 7
180 GT25--180-45 995 × 260 × 45 50 × 50 × 5
200 GT25--200-45 995 × 280 × 45 50 × 50 × 5
240 GT25--240-45 995 × 320 × 45 50 × 50 × 5
300 GT25--300-50 995 × 390 × 50 56 × 56 × 6
360 GT25--360-55 99 × 460 × 55 60 × 60 × 5
400 GT25--400-65 995 × 520 × 65 70 × 70 × 5
450 GT25--450-75 995 × 590 × 75 80 × 80 × 5
Table 5: Specifications of GU Type Steel Grating for T-2 and T-6
Trench Width
(mm)
T-2 or for Passageway T-6
Model Trench Cover Size
(mm)
Angle Frame Size
(mm)
Model Trench Cover Size
(mm)
Angle Frame Size
(mm)
100 GU2-100-20 995 × 160 × 20 30 × 3 GU6-100-25 995 × 90 × 25 40 × 5
120 GU2-120-20 995 × 180 × 20 30 × 3 GU6-120-25 995 × 110 × 25 40 × 5
150 GU2-150-20 995 × 210 × 20 30 × 3 GU6-150-25 995 × 140 × 25 40 × 5
180 GU2-180-20 995 × 240 × 20 30 × 3 GU6-180-25 995 × 170 × 25 40 × 5
200 GU2-200-20 995 × 260 × 20 40 × 5 GU6-200-32 995 × 190 × 32 40 × 5
240 GU2-240-25 995 × 304 × 25 40 × 5 GU6-240-32 995 × 230 × 32 40 × 5
300 GU2-300-25 995 × 364 × 25 40 × 5 GU6-300-38 995 × 290 × 38 40 × 5
360 GU2-360-25 99 × 424 × 25 40 × 5 GU6-360-45 995 × 350 × 45 50 × 6
400 GU2-400-25 995 × 464 × 25 40 × 5 GU6-400-50 995 × 390 × 50 50 × 6
450 GU2-450-32 995 × 544 × 32 40 × 5 GU6-450-50 995 × 440 × 50 50 × 6
500 GU2-500-45 995 × 580 × 45 50 × 6 GU6-500-50 995 × 490 × 50 50 × 6
600 GU2-600-50 995 × 690 × 50 56 × 6 GU6-600-50 995 × 590 × 55 63 × 6
Table 6: Specifications of GT Type Steel Grating for T-14
Trench Width
(mm)
T-14
Model Trench Cover Size
(mm)
Angle Frame Size
(mm)
100 GU14--100-25 995 × 90 × 25 40 × 5
120 GU14--120-25 995 × 110 × 25 40 × 5
150 GU14--150-25 995 × 140 × 25 40 × 5
180 GU14--180-32 995 × 170 × 25 40 × 5
200 GU14--200-32 995 × 190 × 32 40 × 5
240 GU14--240-38 995 × 230 × 32 40 × 5
300 GU14--300-45 995 × 290 × 45 50 × 6
360 GU14--360-50 995 × 350 × 45 50 × 6
400 GU14--400-50 995 × 390 × 50 50 × 6
450 GU14--450-55 995 × 440 × 55 63 × 6
Table 7: Steel Grating for Wellhole Cover
Item Suitable Load Type Wellhole Size
(mm)
Grating Size
(mm)
Frame Size
Frame Size
(mm)
Supporting Bar Size
(mm)
GWC-01 T-25 300 × 400 305 × 500 × 55 335 × 520 × 60 60 × 5
GWC-02 T-25 400 × 400 395 × 500 × 55 425 × 520 × 60 60 × 5
GWC-03 T-25 500 × 400 485 × 500 × 55 515 × 520 × 60 60 × 5
GWC-04 T-25 300 × 500 305 × 620 × 65 335 × 640 × 70 70 × 5
GWC-05 T-25 400 × 500 395 × 620 × 65 425 × 640 × 70 70 × 5
GWC-06 T-25 500 × 500 485 × 620 × 65 515 × 640 × 70 70 × 5
GWC-07 T-25 300 × 600 305 × 740 × 75 335 × 760 × 80 80 × 5
GWC-08 T-25 400 × 600 395 × 740 × 75 425 × 760 × 80 80 × 5
GWC-09 T-25 500 × 600 485 × 740 × 75 515 × 760 × 80 80 × 5
GWC-10 T-25 500 × 700 485 × 840 × 75 515 × 860 × 80 80 × 5
GWC-11 T-25 700 × 700 695 × 840 × 75 725 × 860 × 80 80 × 5
GWC-12 T-20 300 × 400 305 × 490 × 50 335 × 510 × 56 56 × 6
GWC-13 T-20 400 × 400 395 × 490 × 50 425 × 510 × 56 56 × 6
GWC-14 T-20 500 × 400 485 × 490 × 50 515 × 510 × 56 56 × 6
GWC-15 T-20 300 × 500 305 × 600 × 55 335 × 620 × 60 60 × 5
GWC-16 T-20 400 × 500 395 × 600 × 55 425 × 620 × 60 60 × 5
GWC-17 T-20 300 × 600 485 × 600 × 55 515 × 620 × 60 60 × 5
GWC-18 T-20 400 × 600 305 × 720 × 65 335 × 740 × 70 70 × 5
GWC-19 T-20 500 × 600 485 × 720 × 65 515 × 740 × 70 70 × 5
GWC-20 T-20 600 × 600 605 × 720 × 65 635 × 740 × 70 70 × 5
GWC-21 T-20 500 × 700 485 × 840 × 75 515 × 860 × 80 80 × 5
GWC-22 T-20 700 × 700 695 × 840 × 75 725 × 860 × 80 80 × 5
GWC-23 T-14
(contains T-6)
300 × 400 305 × 480 × 45 335 × 500 × 50 50 × 5
GWC-24 T-14
(contains T-6)
400 × 400 395 × 480 × 45 425 × 500 × 50 50 × 5
GWC-25 T-14
(contains T-6)
500 × 400 485 × 480 × 45 515 × 500 × 50 50 × 5
GWC-26 T-14
(contains T-6)
300 × 500 305 × 590 × 50 335 × 610 × 56 56 × 6
GWC-27 T-14
(contains T-6)
400 × 500 395 × 590 × 50 425 × 610 × 56 56 × 6
GWC-28 T-14
(contains T-6)
500 × 500 485 × 590 × 50 515 × 610 × 56 56 × 6
GWC-29 T-14
(contains T-6)
300 × 600 305 × 700 × 55 335 × 720 × 60 60 × 5
GWC-30 T-14
(contains T-6)
400 × 600 395 × 700 × 55 425 × 720 × 60 60 × 5
GWC-31 T-14
(contains T-6)
500 × 600 485 × 700 × 55 515 × 720 × 60 60 × 5
GWC-32 T-14
(contains T-6)
600 × 600 605 × 700 × 55 635 ×20 × 60 60 × 5
GWC-33 T-14
(contains T-6)
500 × 700 485 × 810 × 60 515 × 830 × 65 65 × 5
GWC-34 T-14
(contains T-6)
700 × 700 695 × 810 × 60 725 × 830 × 65 65 × 5
GWC-35 T-2
(contains passageway)
300 × 400 305 × 454 × 32 335 × 472 × 36 36 × 4
GWC-36 T-2
(contains passageway)
400 × 400 395 × 454 × 32 425 × 472 × 36 36 × 4
GWC-37 T-2
(contains passageway)
500 × 400 485 × 454 × 32 485 × 472 × 36 36 × 4
GWC-38 T-2
(contains passageway)
300 × 500 305 × 570 × 40 335 × 590 × 45 45 × 5
GWC-39 T-2
(contains passageway)
400 × 500 395 × 570 × 40 425 × 590 × 45 45 × 5
GWC-40 T-2
(contains passageway)
500 × 500 485 × 570 × 40 515 × 590 × 45 45 × 5
GWC-41 T-2
(contains passageway)
300 × 600 305 × 670 × 40 335 × 690 × 45 45 × 5
GWC-42 T-2
(contains passageway)
400 × 600 395 × 670 × 40 425 × 690 × 45 45 × 5
GWC-43 T-2
(contains passageway)
500 × 600 485 × 670 × 40 515 × 690 × 45 45 × 5
GWC-44 T-2
(contains passageway)
600 × 600 605 × 670 × 40 635 × 690 × 45 45 × 5
GWC-45 T-2
(contains passageway)
500 × 700 485 × 780 × 45 515 × 800 × 50 50 × 5
GWC-46 T-2
(contains passageway)
700 × 700 695 × 780 × 45 725 × 800 × 50 50 × 5

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