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TRANSPORTATION

Output of vehicles for transportation of materials depends on :-(a) Carrying capacity of vehicles by weight or volume, whichever is critical.(b) Distance to be travelled.(c) Time taken in loading. and in unloading. .(cl) Idle time in waiting for turn at loading ‘and unloading point, where, applicable.(e) Time lost in payment, documentation and checking .at loading and unloading points and at octroi and check posts,

if any.(f) Average speed. of vehicle depending on the condition of road, vehicle and traffic.

The carrying space in a ten tonne truck measures approximately 14’ - 7” x 7’ - 3” x 1’ - 10” (height of tailboard), which for allpractical purposes of calculations is taken as 185 cft or 5.3 cu m.

Average speed of trucks may be taken as 25 kmph. The speed will work out lesser for short trips and may go up to about 35 to40 kmph for long distances to be travelled on open roads.

Time required for loading and unloading of various building materials using manual labour is given in the table below.

LOADING / UNLOADING TIME

‘. ‘Materials handled

,.

_ :

Time to be allowed (per unit) in minutes

Loading’ : Unloading’Unit

Ideal strength ‘. Time in Ideal Strength Time in of labour gang to minutes of labour gang to minutes

.i _. : be employed..’ be employed

5 9 .3 8

.‘6 30.6 126 6 .

10 tonne Cement in bags per tonne 3 46’ ‘303000 Nos Flooring tiles, of20 x 20 cm size 1.000 Nos

,14’cd m Timber in cut sizes per.cu m 6 10 ‘.5.3 cu m Miscellaneous stores per cii in 6 10’

2

3.6

64B6 ’66

3

Time’ required per 120D round.trip of = t + -------

truck in minutes s. .: : .

Number of trips tobe done by a truck Lp e r d a y

W h e r e :-

. . t = Time taken in minutes for loading + time taken in minutes for unloading + average time lost in minutes

Dper trip for payment, documentation, checking, octroi, toll posts etc., as applicable.

= One way distance in km:H = ‘Number of hours of work per day.S =’ Speed of truck in km per hour.

Efficient loading using chutes or machine operated shovels. for loading, ‘and unloading by tipper trucks/dumpers for‘materials like earth,. sand, shingle, aggregate, boulders, stones etc., requires about 4 minutes per vehicle for loading and3 minutes per vehicle for unloading, inclusive of manouvring the vehicle in position;

_:’ Regional transpoit authorities allow 6 labourers to travel along with the truck for loading and unloading purposes. Wherea ,very large quantity of materials is to be moved employing several trucks, separate stationery gangs at the loading and‘unloading points can be employed, leading to economy: : ‘ . .::’

When checking back on the number of kilometres done suitable allowance should be made for the movement of vehiclefrom its place of parking to duty and back, (say 6 km/day on an average). . .

: . .: ..a two-bullock cart may be taken as 1.25 cu m or 1 tonne travelling at a speed of about 3 to.4

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