Introduction: Sambhavna offers many flats ranging from 520 sq ft to 1520 sq ft in 9 & 12-storey towers. Luxuriously planned with the most amicable amenities, boasts of 60% open green spaces with most apartments facing the central garden.
Project Snapshot : The project is located off the Lucknow Rae Bareilly road and is 10 kilometres (km) away from Amausi Airport and 11 km from Hazratganj. The project has good road connectivity. The project is targeted to the service class in the region.
A wide range of lifestyle amenities such as a club, a swimming pool, indoor and outdoor sport facilities, central park and shopping complex are available. There are in all 17 towers with 14 towers having 12 floors and remaining 3 towers having 11 floors each, internal roads were 12 m wide. Completion Date:2013
Equipments used: Transit mixer: It is device that homogeneously combines cement, aggregate such as sand or gravel, and water to form concrete. Transit mixer is truck mounted by a revolving drum to mix the components. For smaller volume works portable concrete mixers are often used so that the concrete can be made at the construction site.
Back hoe: A backhoe, is a piece of excavating equipment or digger consisting of a digging bucket on the end of a two-part articulated arm. They are typically mounted on the back of a tractor or front loader. The section of the arm closest to the vehicle is known as the boom, and the section which carries the bucket is known as the dipper or dipper stick.
Concrete Pump: The main type of concrete pump is either mounted on a truck and known as a truck- mounted concrete pump or placed on a trailer, and it is commonly referred to as a line pump or trailer-mounted concrete pump. This pump requires steel or rubber concrete placing hoses to be manually attached to the outlet of the machine.
Procedure Excavation: Excavation was carried out both manually as well as mechanically. Adequate precautions are taken to see that the excavation operations do not effect the adjoining structures.
P.C.C: After the process of excavation, laying of plain cement concrete that is PCC is done. A layer of 75 mm was made in such a manner that it was not mixed with the soil. It provides a solid base for the raft foundation and a mix of 1:3:6 that is, 1 part of cement to 3 parts of fine aggregates and 6 parts of coarse aggregates by volume were used in it.
LAYING OF FOUNDATION At the site, Raft foundations was used to spread the load from a structure over a large area, normally the entire area of the structure. Normally raft foundation is used when large load is to be distributed and it is not possible to provide individual footings. Raft foundations have the advantage of reducing differential settlements as the concrete slab resists differential movements between loading positions.
They are often needed on soft or loose soils with low bearing capacity. Raft Foundation had a thickness of 750 mm. Bars of 25 mm to 16 mm were used and chairs were used.
FORM WORK Forms or moulds or shutters are the receptacles in which concrete is placed, so that it will have the desired shape or outline when hardened. Once the concrete develops adequate strength, the forms are removed. Forms are generally made of the materials like timber, plywood, steel, etc.
Scaffolding/props used: Scaffolding is a temporary structure used to support people and material in the construction or repair of buildings and other large structures. It is usually a modular system of metal pipes or tubes, although it can be from other materials. The key elements of a scaffold are standards, ledgers and transoms.
CONCRETING Type of Cement Used :P.P.C (A.C.C) Grade of concrete in slabs and beams :M-20 Grade of concrete in coloumns:M-30 Grade of concrete in P.C.C work:M-10 Grade of concrete in Raft foundation:M-25
Concrete was made at the site only at the batching plant. From there it was carried upto the site with the transit mixer. Capacity of a transit mixer :6m3 Aggregates sizes :20 mm ,10mm Fine aggregate (sand):zone 2
REINFORCEMENT Fe-500 grade of steel was used. High strength deformed bars conforming to IS: 1786 ,grade Fe 500, indicate yield stresses 500 N/mm2 are commonly used.
Column Total no. of columns in a floor was 69 , in which 64 have dimension 750*250 and remaining 5 columns having dimension 600*250. There were 10 bars used in the columns in which the corner bars were of dia. 25 mm ,and the remaining were 20 mm dia. till 5 th floor. 6 th to 9 th floor bars of dia. 20 mm and 16 mm were provided respectively in the corner and in the middle. From 9 th onwards till the end the bars of dia. 16 mm and 12 mm were provided.
Ring/Tie bars: 8 mm dia. bars were used as ring. The larger ring was of dimension 650*150 mm which holds the corner bars and the smaller ring was of dimension 350*150 which holds the inner bars. Spacing between the rings: The spacing between the top and the next ring was 80 mm and also the same spacing was provided for the bottommost and the ring above it. Rest all the spacing between the rings was 120mm.
Beams: Beams were of sizes 230*400,small beams of size 230*160 was also provided. Main Reinforcement: Mostly bars of dia 25,20 and 16 mm were provided. Shear Reinforcement: Stirrup was of dia. 8mm. Stirrups were provided for the shear reinforcement ,1 st stirrup is at 40 mm from face of the supporting member. Spacing of the stirrup was upto 2*(dia of the main bar)
Slab: Main bars used were of 12 mm at the top and also at the bottom. Chairs were provided at different locations to provide the spacing required between the top and bottom reinforcement. Thickness of the slab was 100 mm. Note: No shear reinforcement is provided in the slab.
Cover block: Cover blocks are placed to prevent the steel rods from touching the shuttering plates and there by providing a minimum cover and fix the reinforcements as per the design drawings. Covers should be made of cement sand mortar (1:3). Ideally, cover should have strength similar to the surrounding concrete, with the least perimeter so that chances of water to penetrate through periphery will be minimized.
CONCLUSION This training is comprehensive in filling the gap between the theoretical & practical studies At the site there was a good management system between the contractor, the consultant, and the client. I found that there was good understanding between the supervisor and the workers, though works are interdependent but there were no contradiction between them.