study on construction of metro rail station
TRANSCRIPT
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STUDY ON CONSTRUCTION OF METRO RAIL STATION
Shreenithis L*1, Vennila G*2 *1Final Year Student, Civil Engineering, K S Rangasamy College of Technology, Tiruchengode, Tamilnadu, India.
*2Professor, Civil Engineering, K S Rangasamy College of Technology, Tiruchengode, Tamilnadu, India.
E-mail: [email protected]
ABSTRACT
The project enables me to gain knowledge that is more practical and to acquire industry-based skills.
The Training consists of site supervision of various recent projects undertaken by the company in and around
the Chennai district. The company has ongoing construction works on two sites in Chennai region. The project
work undertaken by the company is the Construction of Chennai Central Square of plinth area 384 sq. m and
the second region is in Shenoy Nagar, In that area they where doing construction of park, parking and mall and
above the metro rail station the plinth area 20780 sq. m the work that was undergone during the period of
training. The works undergone are pile foundation on one side part work and another side concrete slab work
is going on. In this training period gained the knowledge about the actual conditions of the site, the problems
faced at site and the strategy used to deal the problems in practical.
I. INTRODUCTION
The site of construction is metro rail station at Chennai in this training period I have attained technical
knowledge during the course time, after which was able to compile as a report. The report consists of brief
study description of work in construction. The best to elaborate the actual site condition and problem faced at
the site and the tactics used to deal with them. The main objective of this report is to present a systematic text
on the execution of construction and added the summary of the training program and training schedule.
II. MODERN PLANS ADOPTED
Study Of Plan And Methodology
During the first 2 days study the key plan of diaphragm wall, pile foundation, the methodology and IS
codes has been used for pile foundation and the diaphragm wall and the reinforcement for the diaphragm wall
and pile foundation are given below. There have been 97 pile foundation of the as column as shown in the
figure 1
Figure 1: Columns Position
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Sequence For Plunge Column Installation Work
1. Prepare site for Rig moment
2. Fixe pile point by surveying
3. Bore drilling up to required depth (as per GFC)
4. Pile base cleaning by bailer (bucket)
5. Fabricate plunge column as per approved GFC drawing
6. Fabricate reinforcement cage as per approved GFC drawing
7. Lower rebar cage and hanging on casing
8. Lower plunge column with rebar cage (welded together )as per GFC drawing
9. Lower tremie (2 set ) outside plunge column
10. Place concrete –M40 up to 1 m above cut off level (-21.575)level
11. Back fill with M5 concrete from cut off level to B1 slab with sand from B1 ground floor level
12. In fit M70 concrete
Tools Used For Pile Foundation
1. BG 36 hydraulic rotary rig with casing adopter arrange met
2. RCD (reverse circulation drilling)
3. 150t and 50t crane with necessary hook arrangement
4. Polymer mixing unit
5. Slurry test equipment, 1) mud balance , 2) marsh cone ,3) PH meter
6. Cutting and bending machine
7. Welding machine ( MIG and stud )
8. Guide casing pipe
9. Total station
10. Vertical pump
11. Sounding chain
Rotary Drilling Rig
The rig that has been used to drilling the hole for the pile foundation there has been 97 plunge column
in that they been using for three types of drilling bit is been there
1. Soil bucket drilling
2. Auger drilling
3. Core barrel drilling
There has been taken photo and the reference photo is been given below as in figure 2 drill bit is been
going inside, in figure 3 taken out with the soil bucket ,in figure 4 there has been size of the rig and figure 5 rig
features of the rig
In this drilling we want to use the polymer the density has to been 1.00to 1.01 it has to be
concentration at the level of < 1.04 viscosity has to be 55 to 140 before concentration 50 to 140
Figure 2: Polymer Poring Figure 3: Soil Bucket
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Figure 4 RIG BG 36 Length, Width And Height
Figure 5: RIG BG 36 Parts and Power
Reverse Circulation Drilling Rig
The RCD (reverse circulation drilling) is been used for the fastest drilling bit than the normal drilling
rig and it has three type of drilling bit in this they use the air pressure and water for the rotation in this method
we don’t need of the polymer the three type of drilling bits
1. Tooth cutter
2. TCI button cutter
3. TCI button disc cutter
There has been taken photos and the reference photo is been given below as in figure 6 types of drill
pit is given, in figure 7 the main drill bit putting inside of the casing, in figure 8 the RCD is on the first stage on
the casing and figure 9 RCD type and features is given
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Figure 6 RCD Drill Bit Size Is Used
Figure 7: Main Drill Bit Going Inside Figure 8: RCD Drill
Figure 9: RCD Drill Types
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Ground Floor Concreting
In this concreting they were leveling the soil and they were using plain cement concrete as for the base
and then they use 12mm thickens of plywood for separating the plain cement and ordinary cement concrete
and they were using lap joint as coupler
Step That Have Been Processed
1. They have been using bending machine and cutting machine form steel reinforcement
2. As size of design they form the reinforcement
3. In that point they want joint more they use threading machine and coupler joint as lap joint
4. By using air pressure pumping machine the clean the concreting inside area
5. By using the concrete pumping and mix of concrete they poor concrete
In given below figure 10 pump that has been used for concreting and in figure 11 lap joint and coupler
and threated steel bar
Figure 10 Concrete Machine Figure 11 Threaded Area
And Coupler
Site 2 Plan And Two Wings
The site 2 plan is been divided in two wings as mirror the total 20870 sq.m the plan have 800mm
thickness of diaphragm wall as 912 RMT there were 102 piles is been there and 627 soil anchors it is been start
in 31 July 2018 it is been construction on shenoy metro station is been running under ground as for services in
the two wings there been divided in to four zone in figure 12 is been called as the east wing of the upper
basement in figure 13 its been called as the west wing upper basement in this project value is been taken as
170 cores project, project finish date as per addendum 29 May 2021.
Figure 12: East Wing Column Position
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Figure 13: West Wing Column Position
Soil Anchors
It is been used for structures support it has been 627 is been added on basement for 60 m depth on the
sand the components is been used for the soil anchors it is been constructed by the reference IS code (IS
10270:1982)
By using the MGJ 50 machine fix that machine in the soil anchor area and drilling inner and outer
casing in to the ground as vertical for every 2m they has to be extend the inner and outer casing pipe and filling
grout through inner casing in to bore hole by doing this they remove the inner casing of every 2m and installing
the tendons then remove of outer casing while pressure grouting the fixed anchor length were testing and pre
stressing of anchor there has been elongation after 24 hrs they check the elongation as per the calculation In
figure 14 the steel standard, anchor wedges, anchor key plate and base plat and the given figure 15 is been
taken from site of east wing
Figure 14 Parts Of Soil Anchor Figure 15 One Of The Soil Anchors
PT SLAB
PT slab is been used in the Shenoy Nagar as the main slab it been used for the reducing of the steel in
the concreting slab it will give more strength than the steel reinforcement in figure 16 the concreting of post
tension slap and vibrator used and in figure 17 the layout of the post tension strand and form work for strand
for pretending concrete going inside
Sequance For PT Slab Concreting
1. Formwork that been called as the temporary molds for the permanent concrete
2. Reinforcing steel that has been added bottom and top reinforcement
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3. They were laying the strand as vertical and horizontal as per the design there has been some grouting pipe
that has been extended from the strand
4. Concrete that has been used as M45 grade for the slab
5. Then using vibrator spreading of the concrete without void
6. They using the anchor casting and split pocket former before the stressing
7. By using the stress jack they stress the tendon tail for the elongation length as per design before stressing
it has to minimum strength attain as 28N/ mm2
8. After 24 hrs they check the elongation length is correct or not
9. Then fill the gap by using the extended pipes mix ratio 20 litre water, 50kg of cement and 225 gm cebex
100
Figure 16: Concrete For Pt Slab Figure 17: Strand Laid Position
DEWATERING
In this dewatering there has been two types of dewatering method id been used one is bottom
level dewatering and another type is been using is top level dewatering in this both used for protection of water
that has been going inside of the concrete and the structure
Bottom Level Dewatering
In this bottom level dewatering there has been used of the water stopper pad as the 12mm
thickness on the PCC concrete as 75 mm thickness level has been layer on the concrete and then they lay 12 mm
thickness of water stopper pad and they put M45 concrete is been used for the concrete in figure 18 there has
been normal PCC layer has been there and role of 12 mm thickness water stopper and in figure 19 you can
see that there has been layer on the normal PC concrete
Figure 18: Normal PCC In Bottom Figure 19: 12mm Thick Water Stopper
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Top Level Dewatering
In this top level there has been using chemical polymer paint to stop the water penetrating inside the
concrete and the building they use polymer as painting on the top of the concrete as like paint and the next day
they fill up the area of 7 cm high on the concrete for 28 days is there any leakage in that they drill and grout the
hole inside with pressure and they repeat the process to check it. In figure 20 they were applying on the wall
and the ground and figure 21 they mixed polymer is been
Figure 20: Applying The Water Stopper Figure 21: Mix Of Water Stopper
CONCRETING PCC ON SAND
Leveling of the concrete is main purpose for the concrete they use PCC for the main concreting
erosion protection they used leveling machine for the sand and they put concrete for 75 mm thickness of
normal PCC concrete in figure 22 sand leveling machine
Figure 22: Ground Leveling Machine
REINFORCING OF RETAINING WALL In this retaining wall is been acted as the compound wall of the Chennai square building and
sand retaining wall they used M45 grade concrete for the retaining wall they were reinforcing the wall by given
diagram details in figure 23 reinforcing of the steel bars is been given and in figure 24 that wall is been ready
for the concreting
Figure 23 Reinforcement Bar Retaining Wall Figure 24: Ready For Concreting
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III. CONCLUSION
This report is a description of practical knowledge from the site of Chennai Central square and in the
Shenoy Nagar.Various methodologies were studied and they were proceeded in the site method as solvingl
problem faced at site
During this Training period, the following conclusions attained,
❖ In this training period I gain knowledge of the construction machinery used in the site.
❖ The training period in Shenoy Nagar how they distributed the workers and timed period.
❖ The various climatic conditions problem as the rainy and sunny time
❖ There have been safety processed by the safety department they been checking of noise, air polution, and
they been checking for by more than 5 safety engineers .
IV. REFERENCES [1] IS 2911 part 1 / Section 2 – code practice for design and construction for piles
[2] IS 2062 ( E350BR) – Structural steel
[3] IS 10262 – code of practice for concrete design
[4] IS 516 – method of test for strength of concrete
[5] IS 816 – code of practice for use of metal ARC welding for general construction in mild steel
[6] IS 822- Code procedure for inspection of welds
[7] IS 2502 – code of practice for bending and fixing of bars
[8] IS 456 2000 – code of practice for plain and reinforcement concrete
[9] IS 14268 : 1995 – pre stressed concrete specification
[10] IS 12269: 1987 – specification for high strength deformed steel and wire
[11] M S Shetty, “Concrete Technology”, S.Chand Publishing company ltd., New Delhi.
[12] M L Gambhir, (Fifth Edition) “Concrete Technology”, Tata McGraw-Hill Publishing company ltd., New
Delhi.
[13] “NATIONAL BUILDING CODE 2016” (Volume-I)
[14] Krishna Raju, “Design of Reinforced Concrete Structures”, CBS Publishers and Distributors, New Delhi.
[15] Dr.M.P.R.M.Ramasamy “VAASTHU SASTHIRAM”.,Chennai