Case Study

CONSTRUCTION OF RCC RETAINING WALLS

The contract catered for mostly stone work retaining walls but stone retaining wall is suitable upto 6.00m height. At site work due to ground there was requirement of retaining wall upto even 12.00m height. Stone retaining wall is not suitable for more than 6.00m height even these cannot be constructed by curtailing the height through stepping due to non availability of adequate terrace widths. As such the requirement of RCC retaining was considered mandatory. The contract authority Chief Engineer Bareilly Zone taken quite good time for study and examining of this. After elapse of long period it was decided to build RCC wall for height exceeding 6.00m and thereafter drawings were finalized and made available for provision of RCC retaining wall. But now CE Bareilly zone has decided that these will be constructed under a separate contract. Our work already suffered for long time and shall also further suffer on account of non construction of retaining wall as we cannot further progress the building work and external services on the blocks where RCC retaining wall is required to be built up of height beyond 6.00m. This is also one of major factor for delay in the progress of work.




LIMITED WORKING TIME DUE TO HOSTILE & INCLEMENT WEATHER

Not only the rainy season pose the problem for smooth working but in winter also due to extreme cold, the working time is curtailed. It is difficult to carryout heavy and critical concrete work beyond 5:00 PM.


TRANSPORTATION OF MATERIALS TO PITHORAGARH

At Pithoragarh, no construction material is available except sand & stone aggregate. All other material including cement & steel are required to be imported from places like Haldwani, Tanakpur, Bareilly, Delhi and other big places. All the materials including cement & steel initially shifted in large containers to Tanakpur or Haldwani in storage sheds of the companies and from there they shift to Pithoragarh in small containers. This mode of transportation entailed quite good time. During rainy season, roads are generally blocked on account of landslides this makes further disruption in supply of materials to the work site. Even local building material like aggregate etc. are also not available in sufficient quantity for large projects, as such these also required to be imported from quite distant places like Tanakpur & Haldwani incurring heavy expenditure.


PROBLEM OF LABOUR

We faced great labour problem at site of work. At Pithoragarh it is difficult to arrange disciplined, sincere labour at justifiable labour rates. The labour demand more money with less of work and also cause labour unrest instigating the other loyal & sincere workers. They also don’t allow to carryout the work by importing the labour from outside Pithoragarh. We solved this problem with our past experienced, managerial skill and keeping proper balance of deployment of local labour v/s imported labour.


CAVE IN & FILLING OF FOUNDATION TRENCHES WITH EARTH

Rain fall generally is very heavy at Pithoragarh, particularly during rainy season, even in non rainy season there is quite good rain fall. Dug up foundation earth trenches used to cave-in & filled up with earth due to gush of water. We had to dewatered the filled up trenches, resorting pumping time & again. Mud was removed manually. This was quite cumbersome & time consuming task. Work was held up for about 1.5 years beyond excavation stage in 10 nos. blocks due to meeting of black cotton soil. The foundation drawings were required to be revised due to this, for which the CE Bareilly zone took about 1.5 years for provision of the same. In these particular 10 nos. blocks we faced the problem of cave in of trenches many times. Earth & water was removed time and again and had also incurred infractuous expenditure. Dug up trenches for casting the raft foundation was also filled up not with only muddy water but also with small rocks and debris due to landslides on the hill sides which occurred on account of torrential rains. The same was cleaned up manually as it was not possible through machinery. For protection of the dug up trenches for security hazard not we had to raise temporarily barricades but also carried out the shoring & strutting of trenches incurring heavy infructuous expenditure.


WATER FOR CONSTRUCTION

In initial stages water was transported in tankers from quite distance places from the construction site. Later on borewells were established at the site of work with the permission of relevant authorities. After extracting water from borewells, it was stored by building the storage tanks. From storage tanks the water was further shifted at different sites in tankers & as well stored, constructing smaller storage tanks.


MOBILIZATION OF MACHINERIES

Mobilisation of machineries was quite difficult task. Initially the machineries was mobilized at Tanakpur. From Tanakpur, it was shifted to Pithoragarh work site. The non movable machineries were reloaded in small trucks at Tanakpur & then shifted. As such shifting of machineries was slow process also being hilly region and existence of narrow & not well built up roads.


APPROACH TO SITE

Surrounding to construction site, well built up road are existing but approach leading to site was not in existence at certain location which we have to built up workable temporary approach.


SALIENT FEATURES

Pithoragarh is a difficult hilly region with altitude 5500 feet. It is about 148 KM from foot hill station of Tanakpur and 184 KM from Haldwani. The state approach road to Pithoragarh is narrow single lane, not well built up and rough in patches.


MAKING OF MARRIED ACCOMODATION PROJECT - PITHORAGARH

CA No. & Name of work : CA NO. CEB/PGH/03 OF 2013-14 : PROVN OF MARRIED ACCN FOR OFFRs, JCOs Ors (MAP PHASE-II) AT PITHORAGARH Work awarded by : Chief Engineer Bareilly Zone vide their letter no.8338/PGH/MAP/136/E8 dated 25th Apr 2013. Amount of work : Rs. 231.94 Crores Date of commencement : 26.04.2013 Date of completion : 25.08.2015


MAKING OF HIGH – COURT - JODHPUR

The client was having desire to provide initially, 12mm thick transparent perplex sheets on MS frame instead of RCC dome, but subsequently on the insistence of advisory committee of High Court building & also keeping in view better aesthetic look and heritage nature of building the client finally decided to provide RCC Dome. But RCC dome decision was conveyed at the fag end and after near completion of other RCC works. Even structural design / drawings were provided by RSRDCC to us after elapse of 3- 4 months of decision so arrived. Keeping in view live and dead load of Dome structure, shuttering was specially got designed by structural designer of MBM college Jodhpur and as per his advice, we procured and fabricated cup lock and ledger from soffit of Dome slab to sub base of ground floor specially for this work. As named 'SUNCITY' Jodhpur becomes too hot and stormy from April to July every year. It was herculean task for us to retain workers and persuade them to work at such a height, being continuous flow of hot and stormy weather. Thus Cup lock and ledgers including each lMT bars were covered with wet hessian cloth before placing at desired place. As there was no access for mobilisation of transport and machinery, nearby dome area, we were forced to work manually and' thus concrete pump was located outside the periphery of main bldg and concrete was placed by laying approximately 200 meter long pipe line. Again, as it was not feasible to place concrete directly at dome, 3 number of plate forms were made and double shuttering (soffit as well as top of dome slab) was provided to avoid segregation of concrete during casting. Seeing the hoop stress dome was casted in 1200mm of strip of circular periphery of slab. To avoid any misshaping temporary railing of MS pipe was made throughout the shoulder. All the Lift area (8 no) was fully covered with the safety nets. With the adoption of all these techniques and devotion towards work the task was accomplished as per design and specifications without single incident of accident / mishap and no breach of legal law.