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SITE REPORT
PEBBLES II
ABSTRACT
This report highlights the construction
practices and different methods of
managing the construction site of a
residential building as observed in this
visit.
Kalyani Kadam
CPM

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Name of project: Pebbles II
Name of the construction firm: Abhinav Group and Rainbow Housing Developers
Vice-president: Mr Santosh Runwall
Location: Bavdhan Budruk, Pune
Date of Visit: 22nd September 2014
Date of commencement: 22nd September 2012
Date of completion: June 2015
Type of project: Multi-storey residential buildings
INTRODUCTION
Pebbles II residential project is started after the enormous success of Pebbles I,
by the same developer in 2012. These ultra-luxurious flats are designed and
constructed keeping quality and finesse in mind. This project by the Abhinav Group and
Rainbow Housing Developers, in Joint Venture, is constructed with the aim of making it
an eco-friendly project. The developers are accredited with the Adarsh Griha
certificate for environment-friendly construction.
The project estimation is around 600 crore INR.
The construction cost is 2500 INR/ sq.ft – 3000 INR/ sq.ft.
The selling price is currently 6200 INR/ sq. ft.

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Fig. 1: Layout of project.

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Fig. 2: Location of site
SITE LAYOUT
The plot is spread over an area of 6 lac sq.ft in Bavdhan Budruk, which falls under the
town planning zone of Pune. The actual constructed area covers 3 lac sq.ft with 816
flats of type 2bhk and 3bhk.
The site is located near the NH4 highway (Mumbai-Bangalore) providing easy
accessibility.
A sample layout of the site is shown below with markings showing the components at
the site.

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Fig. 3: Site layout.
SALIENT FEATURES
1. TOPOGRAPHY:
 The location of the site was close to a moderately hilly region having high
ground water table.
 The land surface is undulated with expansive black soil dominant in this
region.
 Site is in close proximity to pre-existing buildings and National Highway 4.
2. EXCAVATION:
 Excavation was carried out with the help of excavators.
 We observed an area excavated for construction of club house.
 1m offset was marked around the excavated zone to facilitate easy
movement of the machinery around the periphery.
 The excavated soil was carried by dumpers for dumping and de-watering of
the excavated part was undertaken with the help of pumps.

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3. LABOUR CAMP:
 Labour camp was provided close to the site compound wall for easy access to
site.
 There were in all 700 labours in the camped area whereas 150 labours were
in function on the site.
 The labours carried out work as per the regional speciality, viz:
Concreting: Malda labours (West Bengal)
Tiling: Rajasthani labours
Reinforcing: Maharashtrian labours
Shuttering: Uttar Pradesh and West Bengal
Levelling: Andhra Pradesh
 The labour camp was divided in 3 prominent sections, i.e. hutments,
provisional stores and sanitation facility.
 The site also provided school and crèche facility to the children and toddlers,
with 3 teachers to take care of the necessary educational requirement of
the 60 children.
 A storage tank is provided for potable water around the periphery of the
camp.
4. STORES:
 Stores were located in the building vicinity to enable easy transport of
materials.
 The store kept a book record of the quantities provided for construction and
procured additional materials required.
 It also housed a Compression testing machine to test the Concrete Block
Strength on site apart from the third party testing which is carried out by
Durecrite.
 It stored Cement blocks, Tiles, Sanitary fixtures, Pump parts, Granite slabs,
pipes, plumbing accessories, lighting fixtures etc.

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Fig. 4: Labelling concrete blocks for Testing.
5. BAR BENDING YARDS:
 Bar bending yard was located near the entrance to the buildings, facilitating
prompt delivery of reinforcement on site.
 Bar bending was carried out manually by labours.
 The bars after cutting were laid separately as per their shape, thus
increasing efficiency.
Fig. 5: Bar bending yard.

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6. PLANT AND MACHINERY:
 Plant and machinery were involved on a large scale in the construction of this
project, making the project as of whole cost-effective.
 Detachable Tower Cranes were employed for building construction.
 Excavators, dumpers and dozers were also employed.
 Maintenance of the machinery was taken care of by the Maintenance
Engineer.
7. BATCHING PLANT:
A batching plant is an equipment used to mix the different components of concrete to
produce a desired grade of concrete.
 A batching plant with 2 silos for cement and fly ash was located on site.
 The coarse and fine aggregate was laid around the mixer for easy filling.
 Water was directly pumped in the mixer by a pump and hose.
Fig. 6: Cement & Fly ash silo in Batching Plant.
 The automated plant was operated by a Mechanical Operator, by feeding the
inputs as per the given combination to achieve a uniform mix.
 The capacity of the mixer was 0.35m3.
 The discharge rate of plant is 12 m3 per hour.

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Fig. 7: Concrete mixer in Batching Plant.
 The freshly produced concrete was then pumped at the desired spot.
 Cement slurry is passed through the pipe prior to concreting to wet the inner
section of pipe to, thus avoiding obstruction.
 The concreting pipe was cleaned with the help of high speed water jets and
passing a ball to clear the residual concrete in the pipe.
8. WATER AND POWER SUPPLY:
 Taking advantage of the high water table and undulated hilly area, an
artificial reservoir is constructed close to the site.
 This work was undertaken to fulfil two objectives, namely:
a. Raising the ground water table
b. Providing water for construction activities
 Water from the artificial reservoir is pumped onsite, helping to reduce the
load on local water supply.
 Power is obtained from MSEB (Maharashtra State Electricity Board),
through transformers installed on site, for operating machines.
 An additional diesel generator backup is provided for emergency power
generation.
 The construction activities are so planned to avoid wastage of water and
power.

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9. FOUNDATION:
 Hard strata was found at a shallow depth ranging from 2m to 4m.
 Owing to this shallow depth, box footing is provided to the structure instead
of raft footing.
 Since the depth of the hard strata varied between 2m to 4m, depth of footing
was changed accordingly.
 Concrete of grade M30 was used for construction of footing.
10.SCAFFOLDING AND SHUTTERING:
 Bamboo scaffolds were primarily used for scaffolding and tied with binding
wires.
 Wooden ply boards, horizontal and vertical planks and metal props were
used for shuttering.
 The extendable vertical props can be extended up to a height of 4m.
 Horizontal distance between two successive props was 2ft centre-to-centre.
 To reduce the number of vertical props, GI span sections were laid
horizontally at beam sections.
 For columns, the shuttering was provided with inclined extendable metal
struts, anchored to the ground with a bolted base plate.
 To hold the shuttering in place and retain the shape C-clamps were also used.
Fig. 8: Bamboo scaffolding and shuttering.

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11.CONCRETING:
Concreting is the process of producing concrete by preparing a uniform homogenous
mixture of cement, crushed sand, aggregates, water and admixture.
 Concrete of grade M20 and M30 were produced for suitable sections.
 Slabs and beams were cast monolithically using M20 grade of concrete.
 For columns, M30 grade of concrete was produced.
 For basement, parking, podium and slab sections concrete pumping was
employed.
 For column sections, concreting was done manually.
 Vibrators were used for proper consolidation of concrete and to avoid
segregation and bleeding.
Fig. 9: Representative picture displaying Pump Concreting.
 Concrete blocks were cast and tested periodically for strength parameters.
 For walls and partitions AAC blocks (Autoclaved Aerated Concrete) were
used due to the following advantages:
a. Light weight
b. Less consumptions of power during production
c. Reduced amount of water for curing
d. Heat refractor
e. High strength
f. Less amount of sealant used to fill the joints, hence economical
g. Easy to place and skilled labour not required
 Size of AAC block was 300mm*225mm*150mm and
600mm*225mm*150mm.

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Fig. 10: AAC block wall.
12.DRAINAGE AND UTILITY LINE:
 Trenches were excavated with the help of backhoe to lay the drainage and
electricity lines.
 These trenches were rectangular in section and laid with asbestos pipes to
carry sewage.
 These pipelines connected the sewage pipes to the city sewage system.
 Power lines, encased in PVC pipes, were also laid underground along with
water supply lines.

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Fig. 11: Representative picture showing Trench Digging.
13.PARKING AND BASEMENT:
 2 storey parking facility is provided, which included basement parking and
podium parking.
 The pavement for the basement parking was 200mm thick tremix concrete
with underlying wire mesh to provide additional support.
 This pavement layer after laying was lined with a wire brush to avoid
skidding of vehicles.
 A 3m high retaining wall is constructed in the basement parking, prior to
construction of super structure, to counteract the horizontal earth
pressure.

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Fig. 12: Podium & basement parking.
 Lighting facility in the basement parking section is an innovative example to
reduce power consumption.
 Hollow vertical ducts up to 1m height were erected on the podium and
covered with light refracting material on the under-side.
 This mechanism allowed ample lighting during day, while only using artificial
lights at night.

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Fig. 13: Hollow vertical ducts.
Fig. 14: Solar refracting Lights.
14.FINISHING:
 Wall finishing in the building was done using Gypsum plaster instead of
Plaster due to its heat resistant property and it gives a gloss finish.
 A 15mm thick Gypsum layer is applied after which 2 coats of paint is applied
on the wall.
 Master bedroom was provided with Wooden flooring with interlocking
segments.
 Kitchen was furnished with Hafele gas burners and chimney.
 Large windows and balcony were provided for better ventilation and
lighting.
 The flights up to 1st floor were provided with Saddar Ali Granite.
 Provision was made on the stair edge similar to skirting to avoid water
spillage during cleaning.
 External finishing consisted of 15 mm thick 1st coat of Gypsum followed by
5mm thick Gypsum plaster.
 Later a coat of paint is applied on the prepared surface.

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Fig. 15: Sample flat with finishing work completed.
15.ELECTRICAL AND PLUMBING FIXTURES:
 Electrical and plumbing fixtures were carried out in 4 stages:
a. Provision for conduits prior to concreting
b. Outlet is provided to fix electric points
c. After the completion of construction wires are passed through
conduits
d. Fixing of switches and distribution board and meter boards
 Switches were provided at standard heights of 2ft and 4ft.
 Legrand switches were used.
 Provision for foot lamps was also made.
 The entire plumbing system was concealed and fixtures were provided at 2ft
and 4ft height.

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16.FIRE FIGHTING SYSTEMS:
 Each floor was equipped with fire fighting equipment such as water hose
connected to water tank and fire extinguisher.
 Parking in the basement was covered with a web of Main and Intermediary
pipes carrying water and connected to a sprinkler mechanism.
 Fire exit doors were provided in the buildings to enable safe exit of residents.
 Smoke detectors were provided throughout the building structure, to detect
smoke and take preventive action.
 The sprinklers would be activated, when a smoke detector sounds an alarm.
17.GARBAGE DUMPING:
 Outlet chutes were provided in the corridor of every floor.
 These chutes pass the garbage to the movable collection bin, which transfers
it to the local garbage collection bodies.
18. ELEVATORS:
 2 elevators were provided in each building.
 One was reserved for general use.
 The other elevator is for maids, maintenance and carrying heavy
equipment.
19.WATER STORAGE AND SEWAGE TREATMENT PLANT (STP):
 The water storage tank is constructed below the basement parking.
 Covers an area of 32m*22m and depth of 3.5m.
 Its storage capacity is 25 million litres.
 The water is supplied to the storage tank from an auxiliary tank, by force of
gravity.
 Sewage treatment plant (STP) is provided under the basement to treat
sewage from household activities, and recycle the water.
 The capacity of STP tank to process, is 665 m3 per day.
 This treated water is used for cleaning vehicles, gardening and flushing in
toilets.

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Fig. 16: Sewage Treatment Plant (STP).
20.QUALITY:
 Quality of work during construction was stringently maintained by periodic
tests.
 The finishing of the flats was done as per required specifications.
 Some of the specifications are:
a. 800 mm x 800 mm vitrified tiles in entire flat.
b. Toto bathroom and sanitary fixtures.
c. Powder coated windows.
d. Designer 7 feet high entrance door.
e. Laminated internal doors.
f. Security system.
g. Glass partition in master bedroom
h. S. S railing and toughened glass in terrace.

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Fig. 17: Kitchen with Hafele fitting.
Fig. 18: S. S railing & Toughened glass.

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21.SAFETY:
 Workers were using helmets and harnesses while working at heights.
 Safety nets were provided at the under-constructed floor to restrict the
debris from falling.
 Labours involved in concreting used gumboots and gloves.
 Lift well were provided with barricade.
 Fire extinguishers were present on site to counter any outbreak of fire.
Fig. 19: Safety net provision.
22.AMENITIES:
 A club house with fully equipped gymnasium and swimming pool is
provided around the building.
 Landscaped gardens, lawns and rock garden covered the open spaces with
provision for rest areas.
 Multi-purpose court, jogging track and net practice cricket pitch is to be
constructed for healthy living.
 An amphitheatre and banquet hall is provided for entertainment purpose.
 An old age home facility will also be provided for elderly.

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Fig. 20: Swimming pool for kids & adults.
Fig. 21: Open garden & elevated walkways.
Fig. 22: Fully equipped Gym.

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23.PURCHASING:
 Material requirement is calculated on the basis of tender document that is
item specifications tender drawings and the purchase requisition is prepared.
 The sample of each material is approved from authorised architect and
client. After the approval of sample the quotations are called from approved
list of suppliers or vendors.
 After receiving quotations from vendors, the final negotiations from the
contractors are called along with checking their capability of in-time supply
and credit limit.
 Finally, a comparative statement is prepared to select lowest quotation with
mode of payment.
 The material is ordered by issuing purchase order including all
requirements, specifications, rate and taxation if any.
 It includes mode of transportation, loading and unloading charges, octroi
charges in municipal corporation area, VAT and other applicable government
taxes.
24.CREDITS:
 Architect: Abhikalpan Architects and Planners
 RCC: Hansal Parikh and Associate Structural Consultants
 Landscape: Designterra Landscape Consultants
 Liaison Architect: Gohad Architects
 Interior: Pranali Shende
CONCLUSION:
The visit enabled us to experience construction practices adopted on site,
all the while maintaining quality and standards. The use of innovative techniques
and installation of STP, makes the project economical and environmentally
beneficial. Efficient use of machinery, saved cost and aids in maintaining the
progress of construction activities.