INTERNSHIP REPORT FOR CONCSTRUCTION MANAGEMENT AND ORGANISING WORKS OF A BUIL...
Final draft Report Harsh
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Industry Training Report
By
Harsh Vikram Singh
MBA-CPM
A 13559014056
School of Construction
RICS SBE
Amity University, Noida
May-July 2015
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SUMMER TRAINING REPORT SUBMITTED TOWARDS THE PARTIAL
FULFILLMENT OF POST GRADUATE DEGREE IN CONSTRUCTION PROJECT
MANAGEMENT
“TOWARDS AN UNDERSTANDING THE MANUFACTURING AND ERECTION
PROCESS OF PRECASTED BUILDING ELMENTS IN SUPERCAST LTD.”
SUBMITTED TO: SUBMITTED BY:
Ms. Shalini Priyadarshini Harsh VikramSingh
Asst. Professor MBA-CPM(2014-16)
Schoolof Construction A13559014056
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DECLARATION
I Harsh Vikram Singh, bearing Registration No. A13559014056 a student of
MBA(Construction Project Management), RICS School of Built Environment humbly
submit that I have Completed from time to time all the works assigned to me and the
essentials required to prepare during my Summer Internship From 21st May 2015 and ending
on 08th July 2015 as described in this report by my own skills.
I certify that I have not copied the report or its appreciable part from any other literature in
contravention of academic ethic.
Registration No: A13559014056
Course: MBA-CPM
RICS School of Built Environment
Date: 25th July 2015 Signature:
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Faculty Guide Approval Page
This is to certify that Harsh Vikram Singh has conducted Industry Training of 8 weeks in
Supertech Precast Technologies Pvt. Ltd. at Greater Noida west (U.P.) under my guidance.
___________________
Faculty Guide Signature
(Name of the Faculty Guide)
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Acknowledgments
The Internship opportunity I had with Supertech Precast Technologies Pvt. Ltd. was an
awesome chance for learning and expert improvement. Along these lines, I see myself as an
exceptionally fortunate individual as I was given a chance to be a piece of it. I am
additionally thankful for having an opportunity to meet such a large number of grand
individuals and experts who drove me however this temporary job period.
I would specially like to thank Mr. Kumar Rabish and Mr. Siddhartha Sharma (Production
Head)
for proving the nice ideas to work upon. Not only did they advise about my project but liste
ning to their discussions in weekly meeting had evoked a good interest in Production analysi
s. I am also highly indebted to my supervisors AravindSingh and RakeshSharma, who seeme
d to have solutions to all my problems.
Harsh Vikram Singh
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Table of Content
1. Title Page……………………………………………………………………………..…2
2. Declaration……………………………………………………………………………..3
3. Faculty Guide Approval Page…………………………………………………...4
4. Industry Guide Approval Page …………………………………………………4
5. Acknowledgement…………………………………………………………………...5
6. List of Tables/Figures………………………………………………………………..7
7. Training Certificate from the Training Organization……………….…8
8. Executive Summary………………………………………………………………….9
9. Introduction……………………………………………………………………………10
10.Precast Concrete construction processes………………………………..11
11.Work Measurement………………………………………………………………..13
12.Quality measures…………………………………………………………………….20
13.Stock and Dispatch Department………………………………………………28
14.Erection Operations………………………………………………………………...29
15.Productivity Analysis……………………………………………………………….32
16.Costing exercise…………………………………………………………………….…35
17.Learning Outcomes………………………………………………………………….37
18. References……………………………………………………………………………....38
19.Annexure I - Copy of Log books………………………………………………..39
20.Annexure II – Copy of WPRs ……………………………………………………. 46
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List of Tables
Table 1- Work Measurementof Hollow core slab …………………….13
Table 2- Work Measurementof precastsolidslab ……………………15
Table 3- Work Measurementof precastsolidbeam…………………16
Table 4- Work Measurementof precastwall panels…………………18
Table 5- Design mix of M40 for shed-A ………………………………..21
Table 6- Design mix of M50 for shed-A……………………………………21
Table 7- Design mix of M50 (hollow core) for shed-A………………21
Table 8- Design mix of M40 for shed-B……………………………………22
Table 9- Design mix of M50 for shed-B……………………………………22
Table 10- Design mix of M60 for shed-B…………………………………22
Table 11- Hollow core slab load test ………………………………………26
Table 12- Various test conducted for building elements …………27
Table 13- Weekly Production at Shed A …………………………………..33
Table 14- Chart of weekly production at Shed A………………………34
Table 15- Cost of hollow core slab/sqm. ………………………………….35
Table 16- Cost of precast wall per m3……………………………………….36
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List of Figures
Figure 1- HOLLOW CORE SHED A ........................................................12
Figure 2- WALL PANELS SHED B ……………………………………………………….12
Figure 3- Cube filling before cube test..................................................24
Figure 4- Concrete cube test.................................................................24
Figure 5- Hollow core slab load test.....................................................25
Figure 6- Rectification work of solid slab..............................................25
Figure 7- lifting of staircase...................................................................28
Figure 8- dispatching of wall panels to site. ..........................................28
Figure 9- Stock Yard................................................................................28
Figure 10- Assembling of wall panel and slab at site..............................30.
Figure 11- Assembling of Bars, Conduits before Screeding at site……….31
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Executive Summary
Precast Concrete Technology, the purported innovative technique in an Indian Space can
encourage both pace and nature of the development and in the meantime misuses the
points of interest that these expansive scale tasks offer as far as volume turnover and there
petitions.
With the changing face of realty part in Indian market, the change of development system is
unavoidable.
This paper point sat showing how the Precast Concrete Technology can be productively and
successfully utilize wears different Indian Projects in the light of Projects.
The substance of realty market in India has changed quickly in the course of recent years.
The huge activities including Townships, Mass Housings, IT/ITES parks and SEZs 'are of
normal event nowadays and will just develop exponentially sooner rather than later.
Majority of such activities are as yet being developed utilizing the traditional methods. Thus
the innate point of preference that these tasks offer as far as reiterations and colossal
volume turn over stay unexploited.
Also, these vast scale undertakings developed utilizing customary routines convolutes the
Project Management in terms of speed and nature of the development.
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Introduction
Supertech Precast Technologies Pvt. ltd is Supertech gatherings attempt under the brand
name of Supercast. Supercast is into precast innovation in which cement is cast into a
reusable mold, cured, transported to the development site and lifted into spot as
contrasted and ordinary cast-in-situ development. Supercast uses front line innovation in
precast assembling considering all the quality principles guaranteeing that the completed
item is as desirable.
Super cast Factory has Various Department and I had allocated to each and every
department by my Industry Guide. There are some major Departments:-
1) Production Department
2) Plant and machinery maintenance Department
3) Quality Department
4) Design Department
5) Planning Department
6) Dispatch Department
7) Store and safety Department
Production Department is the heart of whole factory and building element casting done
in two Sheds.
Shed A- Hollow core Slab, Solid Slab, Beam, Staircase, Columns, Mummties etc.
Shed-B- Wall Panel and Kerb Stone.
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Processes of casting of such Building elements
Hollow core Slab:
Hollowcore precastslabsare broadlyusedasa part of an extensivevarietyof structuresas
floor/rooftopparts.
These hollowcore pre-stressedconcrete slabsunits are made utilizinglongline extruders.Supercast
Hollowcore precastslabsare 1.2 meterswide and114 metersinlengthandthe planthas the ability
to produce 1036.8 sq.mts. of emptycentersectionsfordifferentsizesandinchangedthickness.
These Hollowcore slabsoffersthe perfectbasicsegmentbyreducingdeadweightwhile giving the
greatestsupportingproficiencyinsideof the Slabsprofundity.Includingfocal points,forexample,
longercompassesandphenomenal burdenbearinglimits,these demonstratedinnovationsfor
Hollowcore slabpermityouto manufacture extensive ranges withfewerrequirementsforparcel
dividers,bringingaboutextraordinarydesignopportunityamidandafterdevelopment.
There are variousstepsforpreparingahollow core slab-
Step1- Pre cast BedCleaningbyMultipurpose trolley/(BedMaster)
Step2- Oilingthe BedbyMultipurpose trolley/(BedMaster)
Step3 – Pullingof Strandingwiresandtighteningwithbarrel batchesforprestressing.
Step4- Pre-Stressingof strandingwiresforprovidingstrengthinslab.
Step5- pouringthe concrete intooverheadbucketandthenintoCastingMachine (Slipformer)
Step6- castingthe concrete tomake pre cast slab
Step7- De-stressingthe pre-casteslabafter24 hrs withgrinder.
Step8- Cuttingof pre cast slabwithSaw cutterMachine.
Step-9-Qualitycheckbefore liftingandStacking
Then,Liftingandstackingof pre cast slabusingclampswithEOT Crane.
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Fig 1HOLLOW CORE SHED A
Fig 2WALL PANELS SHED B
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Work Measurement
It is the application of techniques designed to establish the time for a qualified worker to
carry out a specific job at defined level of performance, with the help of watch method I
calculated/recorded the time for following work.
Why it is required?
1- Planning need of workforce
2- Facilitating operation scheduling
A– Hollow core slab (114mx 1.2m)
S.no. Processes Duration Requiredmanpower
1 Bed cleaning 45 minute 1 operator1 helper
2 Mould/ Bed oiling 10 minute 1 operator1 helper
3 Fixing of stranding wires on bed 15 minute 1 operator1 helper
4 Pre-stressing work 15 minute 1 operator2 helper
5 Casting of bed 140 minute 1 operator6 helper
6 De-stressing 20 minute 1 operator1 helper
7 Cutting of bed 120 minute 1 operator2 helper
8 Marking and quality check 20 minute 1 helper
9 Lifting of complete bed 90 minute 1 operator1 helper
Table 1- Work Measurement of Hollow core slab
Requirement of building Material for casting a hollow core slab
1. RMC – M50/M40
2. Shutteringoil- 0.04 liter/sqm.
3-StrandingWires(Diameter- 12.7mm/9.5mm/7mm)
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How to FindVolume of Hollow core slabs??
V=Lengthx Breadthx Thicknessx savingfactor
Savingfactorfor thickness- 100 mm is10%
120mm -20%
150mm – 25%
180mm-30%
200 mm-35%
Advantages of Hollow Core Slabs
1) Lesser weight in comparison to Cast-in situ concrete slab of same size.
2) Slab thickness varies from 100mm-300mm and Span length can move up to 13 m.
3) Reduction of in-site concrete.
4) Cast in lifting hooks
5) Speed of erection etc.
B- Solid slab:-
The solid slab is a customized, loosely reinforced, full concrete slab which is used in
residential and industrial construction.
Steps for preparation of Solid slab
1- Bed preparation
(A)- Mould fixing and cleaning
B- Mould oiling
C- Re-baring work or mesh fitting on bed
D- Embedding (Electrical conduits, dowel tubes) -
E- Final checking
After 1 Hour
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2- Casting work
After 18 hours
3- De-moulding
4- Quality check
Work measurement for Solid slab (5190mm X 1675mm)
S.no. Processes Duration Requiredmanpower
1 Mould fixing and cleaning 45 minute 1 welder,2helper
2 Mould oiling 10 minute 1 helper
3 Re-baring work or mesh fitting in
mould
15 minute 1 welder,2helper
4 Embedding (Electrical conduits,
dowel tubes)
15 minute 1 welder,2helper
5 Final checking 5 minute Qualitysupervisor
6 Casting work 15-20 minute 1 mason,1helper
7 De-moulding (after 18 hrs.) 20 minute 1 welder,2helper
8 Quality check 10 minute Qualitysupervisor
Table 2- Work Measurementof precastsolidslab
BEAMS:-
Precast solid Beams are productive and practical answer for a quick development process.
Precast Beams are accessible in standard widths from 190mm to 600mm wide and authority
molds are accessible on solicitation.
Steps for preparation of Solid slab
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1- Bed preparation
(A)- Mould fixing and cleaning
B- Mould oiling
C- Re-baring work or mesh fitting on bed
D- Embedding (Electrical conduits, dowel tubes) -
E- Final checking
After 1 Hour
2- Casting work
After 18 hours
3- De-moulding and 4- Quality check
Work measurement for Solid beams (5905mm X 300mm)
S.no. Processes Duration Requiredmanpower
1 Mould fixing and cleaning 45 minute 1 welder,1helper
2 Mould oiling 10 minute 1 helper
3 Re-baring work or mesh fitting in
mould
15 minute 1 welder,1helper
4 Embedding (Electrical conduits,
dowel tubes)
15 minute 1 welder,1helper
5 Final checking 5 minute Qualitysupervisor
6 Casting work 15-20 minute 1 mason,1helper
7 De-moulding (after 18 hrs.) 20 minute 1 welder,1helper
8 Quality check 10 minute Qualitysupervisor
Table 3- Work Measurementof precastsolidbeam
Advantages of Solid slabs and Beams
1. Attractive appearance because of steelstructure completesandchamferededges.
2. Flexibilityinconfiguration,shape andapplication
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3. Extremelytoughcontrastedwithoptionbuildingmaterials
4. Fast establishmentandautonomousof climate conditions
5. Works well withotherprecastparts,forexample,dividerboards,emptycenterand
twofoldteestoframe anaggregate precastapplication.
6. No insulating/fire proofingneeded
Shed B- Precast Wall Panel:-
Precastwallssupportsthe vertical loadsfromthe floorsandthe upperstructure.These can
likewise performjustasisolatingwalls.Here,the sandwichcomponentscomprise of two
solidlayerswithaprotectionlayerinthe middle.The outside layerisforthe mostpart in
engineeringsolid while the inwardlayerisingraycementand maybe designedasload
bearingor non-loadbearingcomponents.
STEPS INVOLVED IN CASTING A WALL PANEL
1. Fixingthe Mould
2. Cleaningthe bed
3. ApplyShutteringOil
4. Placing the Wire Mesh usingEOT crane
5. FixingEmbedment’s(DowelTubes,Junction Boxes, andElectrical Conduitsetc.)
6. QualityChecking.
7. Concrete Casting(M-40,M-50,M-60)
8. Shiftingtoanothertable byCentral Shifting
9. Leveling
10. Demoulding
11. PlacinginCuringChamber
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Work Measurement of wall panels
S.no. Processes Duration Requiredmanpower
1 Mouldpreparation(fixing,oilingetc.) 50 minute 1 welder,1helper
2 Placingwire mesh 25 minute 1 operator,1 helper
3 Embedding (Electrical conduits,
dowel tubes)
20 minute 4 helper
4 Final checking 15 minute Qualitysupervisor
5 Casting work 15 minute 1 mason,2 helper
6 Leveling 20 minute 1 mason,1helper
7 De-moulding (after 24 hrs.) 30 minute 1 welder,1helper
8 Quality check 5 minute Quality supervisor
Table 4- Work Measurementof precastwall panel
Advantages of Precast Wall Panels
1. Great adaptability in outline, shape, completion and application
2. Used as cladding or auxiliary (protected or non-protected) application
3. Its thickness changes from 75mm to 250mm
4. Extremely solid and sound safe, contrasted with option building materials
5. Quick establishment takes into account a quick building walled in area, before
inhabitant and lower financing expenses
6. Various completions accessible relying upon the necessity
7. Easily versatile to other building materials
8. Indoor assembling guarantees steady quality and takes into account year around
creation
9. Various flame evaluations can be accomplished to address work particular
prerequisites.
Precast Concrete Construction Process
Precast Elements Manufacturing Process
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Hollow Core Slabi:
The architectural drawings are utilized by our basic architects to plan the exceptional
altered or customized slab.
•The Hollow core pre-stressed slabs are casted on beds.
•First, strands are being pulled & pushed through stressing on machine.
•Concrete is then exchanged to the concrete distributor machine from flying bucket.
•Casting is being conveyed in two layers specifically bottom layer and top layer.
•Vertical set patterns are being made on Fresh concrete and horizontal set patterns after
the cement is hardened.
•Once the components are cured, , hollow core slabs are cut into pieces of required size.
•Hollow core slab pieces are lifted and sent to stockyard.
•Hollow core slabs are transported to the site in extraordinary transportation racks that are
lifted and placed onto the trucks.
Precast Wall Panelsii:
The architectural drawings are used by our structural engineers to design the special
customized wall panels.
Precast Wall panels are casted on tables which are mounted on clamps fixed with
rollers.
Concrete is then poured into the moulds through concrete pouring machines.
Steel reinforcement mesh is inserted into the mould and mould is preceded towards
casting station.
After concrete pouring, elements are compacted through vibrators attached with
the tables and finally finished.
Once the elements are cured, the moulds of wall panels are hydraulically tilted to
vertical position for de-molding.
The panels are removed from the mould in one day and stood in the drying rack
using hooks. This enables the manufacturing of panels in higher volumes.
The panels are then stacked in special drying racks that allow the panels to dry
standing up, enabling even curing of the panels.
The panels are transported to the site in special transportation racks that are lifted
and placed onto the trucks.
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Quality Measure
Quality department insures the quality before Erection to the finished casted material.
Material which comes on site has to get approval by the quality department. During
construction also checks are implemented for the quality. If, any material fails in test
proper step to be taken for the strength achievement.
Quality of the company is managed as per ISO 9001-2008. Quality Management System is
used in Precast Factory for monitoring the quality.
There are two separate batching plants for each shed A and B with different capacity.
Shed A – 45 cum/hr
Shed B- 60 cum/hr
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Design Mix
In both Batching plants, they prepare various grade mixes M40, M50 and M60. Each shed
has different Design mix; I calculated cost of each mixes as per Store documents.
For SHED-A
S.NO Description (M-40) Qty Unit Rate Amount
1 Cement (OPC grade 43) 410 Kg 4.42 1812.20
2 Coarse Aggregates (10mm ) 454 Kg 1.43 646.95
3 Coarse Aggregates (20mm) 680 Kg 1.20 813.96
4 Fine Aggregates 695 Kg 1.43 990.38
5 Water 195 Litre 0.00 0.00
6 Admixture (CICO PC) 4.5 Kg 57 256.50
Cost of 1 Cum ₹ 4,519.99
Table 5- Design mix of M40 for shed-A
S.NO Description (M-50) Qty Unit Rate Amount
1 Cement (OPC grade 43) 445 Kg 4.42 1966.90
2 Coarse Aggregates (10mm ) 451 Kg 1.43 642.68
3 Coarse Aggregates (20mm) 677 Kg 1.20 810.37
4 Fine Aggregates 663 Kg 1.43 944.78
5 Water 185 Litre 0.00 0.00
6 Admixture (CICO PC) 5.5 Kg 57 313.50
Cost of 1 Cum ₹ 4,678.22
Table 6- Design mix of M50 for shed-A
S.NO Description (M-50) HOLLOW Qty Unit Rate Amount
1 Cement (OPC grade 43) 400 Kg 4.42 1768.00
2 Coarse Aggregates (10mm ) 1076 Kg 1.43 1533.30
3 Coarse Aggregates (20mm) 0 Kg 1.20 0.00
4 Fine Aggregates 780 Kg 1.43 1111.50
5 Water 160 Litre 0.00 0.00
6 Admixture (CICO PC) 0 Kg 57 0.00
Cost of 1 Cum ₹ 4,412.80
Table 7- Design mix of M50 (hollow core) for shed-A
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For SHED-B
S.NO Description (M-40) Qty Unit Rate Amount
1 Cement (OPC grade 43) 410 Kg 4.42 1812.20
2 Coarse Aggregates (10mm ) 424 Kg 1.43 604.20
3 Coarse Aggregates (20mm) 637 Kg 1.20 762.49
4 Fine Aggregates 768 Kg 1.18 907.39
5 Water 145 Litre 0.00 0.00
6 Admixture (CICO PC) 4.5 Kg 57 256.50
Cost of 1 Cum ₹ 4,342.78
Table 8- Design mix of M40 for shed-B
S.NO Description (M-50) Qty Unit Rate Amount
1 Cement (OPC grade 43) 445 Kg 4.42 1966.90
2 Coarse Aggregates (10mm ) 431 Kg 1.43 614.18
3 Coarse Aggregates (20mm) 647 Kg 1.20 774.46
4 Fine Aggregates 719 Kg 1.18 849.50
5 Water 145 Litre 0.00 0.00
6 Admixture (CICO PC) 5 Kg 57 285.00
Cost of 1 Cum ₹ 4,490.03
Table 9- Design mix of M40 for shed-B
S.NO Description (M-60) Qty Unit Rate Amount
1 Cement (OPC grade 43) 460 Kg 4.42 2033.20
2 Coarse Aggregates (10mm ) 407 Kg 1.43 579.98
3 Coarse Aggregates (20mm) 610 Kg 1.20 730.17
4 Fine Aggregates 767 Kg 1.18 906.21
5 Water 140 Litre 0.00 0.00
6 Micro silica 25 kg 14.25 356.25
7 Admixture (CICO PC) 5 Kg 57 285.00
Cost of 1 Cum ₹ 4,890.81
Table10 - Design mix of M60 for shed-B
They are using Ultra Red oxide cement with OPC 43 Grade and Kotputli sand (fine
aggregates) in respected batching plants.
In quality lab various tests conducted during Pre-pour and Post pour processes
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SLUMP TEST
This test is used for the fresh concrete. Workability of the fresh concrete is checked by this
as per IS: 1199- 1959
APPARATUS:-
Slump cone and temping rod is used for this.
PROCEDURE:-
The internal surface of the mould is thoroughly cleaned and applied with a light coat
of oil.
The mould is placed on a smooth, horizontal surface, rigid and nonabsorbent
surface.
The mould is than filled in four layers with freshly mixed concrete each
approximately to one fourth of the height of mould.
Each layer is tamped 25 times by the rounded end of the tamping rod.
After the top layer is tamped, the concrete is struck off the level with trowel.
The mould is removed from the concrete immediately by raising it slowly in the
vertical direction.
The difference in level between the height of the mould and that of the highest
point of the subsided concrete is measured.
The difference in height in mm is the slump of concrete. This test conducted done during
Pre-pour process.
Cube Test:-
The acknowledgment criteria of nature of concrete are set down in IS: 456-2000. The
criteria are obligatory and different procurements of the code must be gone along before
the nature of concrete is acknowledged. In every one of the cases, the 28-days
compressive strength might alone be the paradigm for acknowledgment or dismissal of
the cement. Keeping in mind the end goal to get a moderately faster thought of the
nature of concrete, discretionary test for 7 days compressive strength of concrete is
done.
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6 Cubes of 150 x 150 x 150 mm measure (the ostensible size of total does not surpass 38
mm) should be cast, 3 for 7-days testing and 3 for 28-days testing. An arrangement of 3
cubes specimen (example) normal quality will be a sample. The individual variety of an
arrangement of 3 cubes samples ought not to be more than ± 15% of the normal. On the off
chance that more, the test consequence of the example is invalid.
Fig 3 Cube filling before cube test
Fig 4 Concrete cube test
I also performed hollow core slab load test,
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Fig 5 Hollow core slab load test
RECTIFICATION WORK OF SOLID SLAB AT SHED A
Mostly due to improper handling if any casting element damaged at factory then quality
team rectify to that element, they use some chemical compounds like – conceressive 2200,
curing compound for slab rectification work and check after successful completion.
Fig 6 Rectification work of solid slab
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Table 11- hollow core slab load test
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S. No. Material List of tests
1 Coarse aggregate 1. Specificgravity
2. Finenessmodulus
3. Crushingvalue
4. Impact value
5. Flakinessindex
6. Water absorption
2 Fine aggregate 1. Finenessmodulus/gradation
2. Siltcontent
3. Specificgravityif applicable
3 Concrete 1. Slumpvalue
2. Compressive strength
4 Cement 1. Fineness
2. Standard consistency
3. Setting time
4. Compressive strength
5 Steel 1. Rolling margin (external agency)
2. Elongation ( external agency)
3. Ultimate tensile strength ( External agency)
4. Proof stress (external agency)
5. Bend test if applicable ( external agency)
6. Rebind test if applicable (external agency)
Table 12- Various test conducted for building elements
Water – PH value should not be less than 6.8.
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STOCK AND DISPATCH DEPARTMENT
Dispatch department is responsible for all stacking lifting handling and dispatching process
for casted building elements.
Fig 7 lifting of staircase
Fig 8 dispatching of wall panels to site
Fig 9 Stock Yard
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Erection operation
General:
Proper planning and preparatory work are required before the actual erection of precast
concrete ensure efficient and quality installation. The following items should be carefully
watched:
Method and sequence of assembly and Erection
Method of providing temporary supports
Provision for final structural connections and joint details
Erection tolerances.
Handling and rigging requirements
Precast Elements Erection Process
A strip foundation or a regularfoundation is laid at the site, depending on the geophysical
characteristics of the site. The panels are brought in by truck and Stacked into site stock yards as
per site logistic plan.
Panels are fitted into the floor by inserting the vertical reinforcing bars protruding from the floor
slab into largeholes (Dowel tubes) in the panel. These largeholes are called Dross Backs.
The panels arevertically positioned on the floor slab, so that the reinforcing rods from the floor
fit perfectly into the Dross Backs. Once in position, grout is pumped into the lower of the two
small holes (Dowel tube) on the side of the panels, filling the tube and locking it to the
reinforcing bars.
The hollow core slabs are laid over the vertically erected panels. Flooring is completed along with doors
and windows fitting. Finishing works are completed and the building is ready for Possession.
Steps of Erection of wall panel
Lift and Stack the panel in their respective place as per given drawing.
Adjust the panel to position and secure it with diagonal props.
Leveled and make aligned it properly.
Prepare and Apply non-shrink mortar to seal the gaps along the bottom edge of
inner side of panel.
For Corrugated Dowel tube, prepare and pour non shrink grout into pipe inlets
provided.
In addition of another wall , One connecting bar of 12 mm will be provide in both
wire loops and seal it with non shrink mortar for jointing of two walls while wire
loops provided in each panel.
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Time Report of Erection process
The panels are lifted using a suitable tower crane and the approved lifting clutches is placed
in lifting holes of loops cast in panels. This is done after a proper study of the lifting capacity
of machines, lifters, chains and slings against weights of panels before handling, which
ensures lifters and chains are fully secured. The lifting and installation is carried out after
thorough preparation & with methodical precision, as well follow all safety standards.
Lifting of Hollow core slab = 6-7 min (from ground floor to 16th floor) with the help of
tower crane
Stacking of Hollow core slab to their position = 6 min
Lifting and stacking operation for Single wall panel = 20-25 min
Sealing of gaps for single panel = 20-30 min
Grouting work for single panel = 15 min
Fig 10 Assembling of wall panel and slab at site
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During fixing of elements they use Props for holding such element, generally site peoples
called its name by Jack.
Props can be removed after 3 day of Screeding work.
RMC M-35 used for screeding work.
M-65 MYK/ GP-2 used for Grouting.
How to prepare Grouting material for Grouting?
Take 25 Kg of dry material and mix it with 5 liter water and repeat it 3 times and mix it with
grinding machine.
Grouting Process in Single wall can be done within 15 minutes after proper leveling.
Fig 11 Assembling of Bars , Conduits before Screeding at site
Screeding thickness over Hollow core slab = 75 mm
Before screeding process embedded all Electrical conduits and Bar mesh as per drawings.
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Lattice bar will be used for jointing of two hollow core slabs.
*In a golf village project 6 ton bars used for screeding of 1 floor in C4 tower.
Erection time Report
Erection of hollow core floor slabs 280-300m2/day
Grouting of floor joints 470- 500 m2/day
Erection of beams 13- 15 pieces/day
Erection of walls 13-15 pieces /day
Staircases about 2-3 floors/day
Productivity Analysis
Productivity Analysis is directed to distinguish zones for potential efficiency change ventures
taking into account factual information gathered amid the investigation. The investigation
likewise pinpoints ranges of postponements and intrusions that cause loss of profitability.
The initial phase in any productivity change activity is to comprehend the current condition
of the operation. Productivity examination gives pattern pointers that will likewise yield
information which will be utilized to focus conceivable efficiency change targets and
potential expense investment funds.
Dependable information got from the profitability investigation additionally makes the
accompanying results achievable:
Determination of productivity change objectives;
Quick disposal of non-esteem included exercises;
Capacity to gauge potential investment funds in view of the investigation results.
34. 34 | P a g e
I analyzed productivity which is totally depends upon master role and Production report
,here I am posting production report with manpower for finding productivity of shed A in a
week except hollow core slab, it was weekly production that I made.
Table 13- Weekly Production at Shed A
Date Production (m3) Cumulative
Production
Manpower Cumulative
Manpower
21/5/2015 6.707 6.707 16 16
22/5/2015 0 6.707 13 29
23/5/2015 8.799 15.506 13 42
24/5/2015 4.08 19.586 18 60
25/5/2015 3.969 23.555 15 75
26/5/2015 6.84 30.395 16 91
27/5/2015 5.86 36.255 16 107
Productivity = Production (in Quantity)/ No. of Manpower used
Productivity = 36.2555/107
Productivity = 0.33 m3 per manpower
35. 35 | P a g e
Table 14- Chart of weekly production at Shed A
This result obtained from shed A.
Basically, Profitability is a normal measure of the productivity of creation. It can be
communicated as the proportion of yield to inputs utilized as a part of the creation process,
i.e. yield per unit of info. At the point when all yields and inputs are incorporated in the
profitability measure it is called aggregate efficiency. Yields and inputs are characterized in
the aggregate profitability measure as their financial qualities. The estimation of yields short
the estimation of inputs is a measure of the pay created in a generation process. It is a
measure of aggregate proficiency of a creation process and in that capacity the goal to be
amplified underway procedure.
0
1
2
3
4
5
6
7
8
9
Production (m3)
21-05-15 22-05-15
23-05-15 24-05-15
25-05-15 26-05-15
27-05-15
36. 36 | P a g e
Costing Exercises
During Summer Internship, I also computed Cost of Hollow Core Slab and Precast wall Panel
as per their drawings.
Table 15- Cost of hollow core slab/sqm
Cost of Hollow Core Slabs
S. No. Description Qty/Amt. Unit
1 Total qty. of Hollow core Slabs 7.13 Sqm
2 Total Material cost 4831 INR
3 Indirect Cost @ Rs 4620 cum 3161.41 INR
4 Labour Cost @Rs. 50/ Sq.mt. 357 INR
5 Total Cost 8349 INR
6 2.5% Contingencies 209 INR
7 Add 5% profit 417 INR
8 Total Charges 8975 INR
Cost of hollow core slab per sqm 1258.81 INR
37. 37 | P a g e
Table 16- Cost of precast wall per m3
COST Of PRECAST ELEMENTS
S. No. Description Qty/Amt. Unit
1 Total qty. of Precast Elements 196.11 m3
2 Total Material cost 2493689 INR
3 Indirect Cost @4620/m³ 906043 INR
4 Labour Cost @Rs. 2100/m3 411838 INR
6 Mould Cost 3922.26 INR
7 Total Cost 3815688 INR
8 2.5% Contingencies 95392 INR
9 Add 5% profit 195554 INR
10 Total Charges 4106634 INR
Cost of pre cast wall per m3 20940.12721 INR
38. 38 | P a g e
Learning Outcomes
I had learnt the Production process, Quality assurance, Erection Process and Costing, now I
am able to assess the suitability of using precast concrete for the building design .I will be
able to assess the efficiency of the joint design prepared by third party, will be able to carry
out joint design with reasonable complexity, will be able to prepare the method statement
and quality assurance policy of the project in precast concrete. I also compared the cost of
Conventional and Precast and computed both are about to same but Precast is very good in
Speed as well as Quality work.
39. 39 | P a g e
References
1. www.supercast.in
2. www.gateprecast.com
3. www.hanson-inc.com
i www.supercast.in
ii www.supercast.in