May 30, 2016

Posted by in 2016, Field Visit, Load Carrying Device, News | 0 Comments

Field visit: Load carrying device



As a part of our first field trip, we visited two construction sites to observe and understand the processes used by construction laborers in their daily working activities. We surveyed and talked to the laborers, both men and women, about construction work in general, the technicalities involved in the process, and also tested the prototypes made by participants of last year’s summer school to understand the reasons as to why the prototypes could not be used. We made several interesting observations about their work style as well as the usage of previously made prototypes which could be helpful in order to come with the design of a load carrying device which could be implemented successfully in daily construction processes.

Load 1

General Observations:

  • The load carried by construction site workers is mostly cement, sand, stones and bricks
  • Two workers are required to lift and place the load (both cement and brick loads) on one of the workers who then carries away the load to further distances
  • Unloading of both cement and bricks however requires only one worker
  • The weight is generally carried on the head by the workers, and varies from 25-30 Kgs in case of sand/cement and around 40 Kgs (or 12 bricks) in case of bricks
  • The workers in general had to travel distances less than 500 meters while carrying load, and most of the load lifting task was done by women, while men were engaged in tasks which involved more of machinery
  • Most of the material to be transferred to floors above ground was carried by trolleys using pulley system, while workers were mostly carrying the material around the floor
  • The workers did not report any problems with the current construction processes. However as our conversation proceeded further, they mentioned a few problems like physical exertion which they had become used to due to years of construction work, but would be a major problem for newcomers in this field of work
  • The contractors said that the workers are paid daily on the basis of the amount and precision of work they do, while construction workers said that they are all paid equally on a daily basis irrespective of the amount/quality of work they do
  • The workers were happy while using the previously developed prototype when they tried to carry the load with it, and said that it actually made the load feel lighter compared to carrying it on head
  • The workers also expressed their inability to buy any such prototypes, and said that they would be happy to use any such other method to lift the load if the contractors would provide them with such prototypes
  • The quality factor for the load being carried at the construction sites was not a major issue, and materials such as bricks and sand were handled roughly by the workers, literally thrown while unloading


Problems with Previous Prototypes:

  • Balancing of the load was a major problem. The load moved on plates as the workers travelled from one point to another, and could have even fallen off in the way
  • The gripping of the load was poor and required certain walls to be built around the tray so as to prevent the load from falling off the plates
  • The workers had to sit on the ground to pick up the load unlike the earlier manual method wherein they could lift the load while standing. This caused them to disbalance while lifting up the load from the ground
  • The CG for the worker-prototype system was not balanced and lied outside of the body of the worker causing him to swing and deflect sideways
  • The currently existing prototype requires two workers for both loading and unloading
  • The head carrier was too high and was not appropriate for both loading and unloading

load 2



The second stop for the field trip was the Chokha Bazaar – the grain market. Labourers in the market are often responsible for loading and unloading of grain bags from the truck, and carrying it to the respective stores, which also involved the labourers climbing up and down the stairs. The purpose of the visit was to observe the process labourers use, analyze it, and see if a better procedure for lifting the same load can be devised or not.

A typical grain bag ranges anywhere from 50 – 100kgs. The extrusions seen in the sealed area are used by the labourers to lift the load. Some labourers used one side of the bag to carry the load whilst the others used both extrusions. When labourers carried the bag from just one side their whole body bent forward and in an one direction. This we felt, had a high risk of them falling down since the whole weight of the bag fell on one side of the body and their gait looked unstable too. Others who carried it on both sides both shoulders had a visibly better balance but still bent down.

Still others used a hook shown above to carry these bags. The traditional practice was to hook the bag on from the upper half onto the hook and lean forward like one shoulder bag carriers mentioned earlier. This didn’t completely stop them from bending forward but halved the amount of weight on their back, since the other half was rested on the hook. The cloth wrapped around the hook provided a better grip on the load.

load 3    load 4


General Observations:

  • On talking to the labourers there, we figured that the labourers had been using the hook since a long time in the past to facilitate the process of carrying the load.
  • When asked if they’ve had any problems carrying the load, they hesitated initially. They would say that they have been doing this for a long time to feel pain anymore. They later said that the people who start carrying load do feel pain and that they too suffer back pain, neck pain. Upon a much closer investigation, we figured that the situation was much more serious than it presented itself on the surface.
  • The labourers incurred serious injuries on their neck area a lot, mainly because the whole weight of the bag always fell on one side of the shoulder. The hook additionally would also cause injuries at times because they carried it very close to their chest area.
  • They added that the bag had to be carried up to its final location without a stop. This meant that the labourers would at times rush to go to the store if the bag got disbalanced; which implies that there’s some risk of falling down with the bag. We also asked them if they had used some other method rather than the traditional hand method or carrying it with a hook which has been in practice for some time now, to which they said that these methods have been the most effective so far.

Thus the problems identified were:

  • Heavy weight on one side of the shoulder.
  • Climbing up the stairs with heavy luggage.
  • Disbalance.
  • Bending down which would eventually lead to an improper body posture and lead to back problems.
  • Incurred medical injuries

Some of the labourers complained that no new device will be able to help them. Their manager said that it is in the fate of labourer to do hard and painful work. He continued to say that a labourer can never live a comfortable life. However, when we showed him the prototype designed for construction site, their opinions changed instantly and he felt more optimistic, and admitted that something better could be designed. The labourers admitted later that this method although in practice, is painful and they would love to try something new.

On concluding thoughts, the aim is to design an equipment that reduces load stress from their back and allows them to carry the load maintaining a straight body posture and without any device like a hook (that poses harm to them).



The third stop for field visit was Kalupur Railway Station.  Coolies are often required for carrying heavier load in and out of train, involving the Coolies to climb up and down the stairs. The main purpose of the visit was to analyse the methodology of load carrying by the coolies and to devise a better method for the efficient load carrying.


General Observations:

  • The average amount of load that the coolie used to carry was around 40 kg.
  • Since the load carried by the coolie had a variety of shape, they insisted that the design for load carrier should be such that it can carry different shape of goods.
  • Generally they used to carry four bags on head and two bags on shoulder.
  • They also use trolley in case the load is very much which is issued by the union on the submission of certain fee and upon the request of the passengers. They usually use lift in case they are carrying the load on trolley.
  • They have health problems too such as joint pain due to carrying load though they are used to carrying of load. Many a times, they fell which lead to serious injury under the pressure of load and the demand of carrying the load in minimum time.
  • Railway had earlier introduced the trolley system for the passengers for carrying load. But, it ultimately lead to the high traffic at lift for the movability of trolley which ultimately led them to miss their train. Thus, this system was totally scrapped
  • Coolie also informed us that their market has significantly reduced due to increased use of the trolley bags for load carrying. Most of the times, people prefer to carry their load themselves. The need of coolie is required only in the case if there is too much luggage.
  • Coolies also told us that the use of the load carrying device will make their work easy, then why would the passengers pay them.
  • They usually need to cover a distance of around 400-700 meters. They also informed us that they face problem in climbing up and down the stairs.
  • They also have problem in transporting the load in heavily crowded platform.
  • We showed them previous year design and tried to get their feedback. They insisted that the design should consist of component involved in carrying load at head only.

They also insisted that the load carrier should be detachable, if it is not portable they would be having problem in getting customers and searching for the load carrier.

load 5


Thus, the problems identified were:

  • Problem in climbing the stairs up and down while carrying the load.
  • They wanted the load carrier for head only.
  • Improper distribution of weight of the load.
  • Problem in transporting the load in crowded area during the peak time.
  • Injuries due to imbalance of load.

Some of the coolies said that no new device will be able to help them. As they need to find the customers first and finding the customer is itself a competitive task. When they were  showed the prototype designed for construction site they admitted that something better can be designed which would be really useful for them. The labourers admitted later that this method although in practice, is painful and they would like to to try something new.



We tried to identify the potential problems and existing difficulties faced by the labourers at the vegetable market at Kalupur. Some of the key observations that we made at the market are:

load 6

General Observations:

  • They have to load and unload the vegetable trucks throughout day and night and have to carry the vegetable sacks up to 100 – 500 meters depending about the situation and traffic inside the market
  • They used to carry load ranging from about 40 – 80 Kgs and that too consisted of different kinds of vegetables.
  • Their wages were dependent on amount of work done by them i.e no. of vegetable sacks loaded/ unloaded by a worker at a time.
  • Different Vegetables are transported in containers (or bags) made from different kinds of materials which may cannot be loaded and unloaded using the same mechanism.
  • Different vegetables have different properties like some are larger while some are too small in size , and some can roll while some other can’t, so it is not possible to start off by addressing the problem with a common product for all
  • By focusing on vegetables we need to study that how efficient our product would be? Since it can easily damage the soft vegetables when they are stacked on one another.
  • The vegetable wastes generated was just deposited in the surroundings and were not dumped or used for any further use.











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