The Minimum Bearing Bar of Steel Grating for Different Kind of Vehicles

Table 1: Minimum Bearing Bar for Various Type of Vehicles

Bar Selection of Welded Steel Grating Floorwith Bar Spacing 34.3 mm
Distance Between Supports (mm)	Car		Forklift				Truck					Truck tractors with trailers
	Q=2.5 (T)		Q=2.5 (T)	Q=3.5 (T)	Q=7.0 (T)	Q=13 (T)	Q=6.0 (T)	Q=9.0 (T)		Q=12 (T)		Q=30 (T)		Q=60 (T)
	P=0.48/0.624		P=1/1.3	P=1.5/1.95	P=3.25/4.225	P=6/7.8	P=2/2.6	P=3/3.9		P=4.5/2		P=5/6.5		P=10/13
	A=0.2×0.15		A=0.2×0.2	A=0.2×0.2	A=0.2×0.2	A=0.2×0.2	A=0.2×0.2	A=0.2×0.26		A=0.2×0.3		A=0.2×0.4		A=0.2×0.6
	RL	RB	RL=RB	RL=RB	RL=RB	RL=RB	RL=RB	RL	RB	RL	RB	RL	RB	RL	RB
300	40×4	40×4	40×4	40×4	50×5	70×5	40×5	50×4	50×4	50×4	50×5	50×4	50×4	60×4	60×4
400	40×4	40×4	40×4	40×5	60×5		50×5	50×5	60×4	60×5	60×5	60×5	60×5	70×5	70×4
500	40×4	40×4	40×5	50×5	70×5		60×4	60×5	70×4	70×5	70×5	70×4
600	40×4	40×4	50×4	60×4			60×5	70×5	70×5			70×5
700	40×4	40×4	50×5	60×5			70×5
800	40×5	40×4	50×4	60×5			70×5
900	40×5	40×5	60×4	70×5
1000	50×4	40×5	60×5	70×5
1100	50×4	50×4	60×5
1200	50×5	50×4	70×4
1300	60×4	50×5	70×5
1400	60×4	60×4	70×5
1500	60×5	60×4	70×5

Precautions

To ensure free movement, it is necessary to install 150 dN/m2 and per unit area of 200×200 mm single dynamic load of bearing bar in the most unfavorable position of the exhaust grating.

Meanings of marks

• Q: The total weight of a full load (T).

• P: a/b (size of resistance).

• a: The maximum load capacity of the car (T).

• b: Value "a", increasing dynamic coefficient (vibration, braking).

• A: Area, on which the force "P" (m×m).

• RL: Along the direction of travel of the bearing bar.

• RB: Along the direction of cross the bearing bar.