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This slide used by one of the interns that had completed his internship in MRT tunneling construction project.
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K H A I R I H A F I Z I B I N K A M A R U D I N
1 5 0 7 7
C I V I L E N G I N E E R I N G
MASS RAPID TRANSIT (MRT)
SG BULOH-KAJANG LINE (UNDERGROUND WORKS)
COMPANY BACKGROUND
Core Business
Engineering
&
Construction
Infrastructure Concessions
Property Development
MASS RAPID TRANSIT (MRT)
Why MRT?
Increasing traffic
Reduce traffic congestion in Kuala Lumpur
Connect two farthest and busiest point
Geographic profile (Hilly) – Solution?
UNDERGROUND!
SG BULOH-KAJANG LINE
UNDERGROUND ROUTE
UNDERGROUND ROUTE
Consists of: 1. Semantan North Portal
2. KL Sentral
3. Pasar Seni
4. Merdeka Station
5. Pudu Shaft
6. Bukit Bintang
7. Inai
8. Pasar Rakyat
9. Cochrane
10. Maluri South Portal
SEMANTAN NORTH PORTAL
What I‟ve been doing/learn so far?
1 • TBM‟s assembly sequence
2 • Tunnel‟s ring installation
3 • Primary and secondary
backfill grouting
What I‟ve been doing/learn so far?
4 • TBM‟s Guidance System
5 • Process in dismantling
TBM‟s Assembly Sequence
TBM‟s Assembly Sequence
Lifting of front
shield onto cradle
Lifting of middle shield and connect with front shield
Lift & connect cutter head with
front shield
TBM‟s Assembly Sequence
Assemble the segment erector
Place screw conveyor into
position and hold it
Lift tail shield and connect it to
middle shield
TBM‟s Assembly Sequence
Install rails for backup gantries
to move on
Install backup gantries 1 to 6
Install backup gantries 7 to 11
TBM‟s Assembly Sequence
Tunnel‟s Ring Installation
One ring consists of 7 segments and 1 key segment.
Total ring that will be installed from Semantan North Portal to Pasar Seni:
Northbound : 1846 rings
Southbound : 1837 rings
Best record : 9 rings/day (14 July 2013)
Tunnel‟s Ring Installation
Steps in ring installation:
Shoving
until reaches
distance of 1.4 m
Transferred segment
into the tail skin using segment magazine
Fixed segment by
using segment erector
Thrust cylinder will
push segment
Segment will be
bolted to tighten its position
Check „Steps & Lips‟ and tail skin
clearance
Tunnel‟s Ring Installation
Primary Backfill Grouting
Primary Backfill Grouting
One of excavation process where we inject a type of LIQUID to stabilize the ground structure and hold the segmental lining.
Gro
ut
Liq
uid
Water
Cement
Stabilizer
Bentonite
Accelerator
Primary Backfill Grouting
Fill up the gap
Prevent ground settlement
Stabilize segmental lining
Improve water tightness
VMT: TBM‟s Guidance System
Unlike cars, TBM need to have a guidance system to ensure the TBM is always follow design tunnel alignment (DTA).
TBM used a guidance system called VMT.
VMT: TBM‟s Guidance System
VMT: TBM‟s Guidance System
1. Horizontal & vertical deviations (mm) 2. Horizontal & vertical tendencies (mm/m) 3. Chainage of front reference point (m) 4. Current advance number 5. Graphical representation of TBM. 6. Roll (mm/m). 7. Absolute pitch (mm/m). 8. Intensity of laser hitting the target. 9. Emitting intensity of laser in percent. 10. Actual computer date and time. 11. Displays for communication programs. 12. Name of project. 13. Shows the operating mode (advance, ring erection). 14. Area reserved for special project informations. 15. Function keys. 16. “Dialog Box”- Window for messages. 17. Last measurement of TBM position was made.
Other than technical skills, what else?
Communication Skills
Learn on how to communicate with workers from China
China People: Mostly cannot speak English
Learn to communicate with other staff professionally.
Time Management
Task given by SV & internship task (logbook etc.)
Prepare to-do list every day
Complete task with high priority first
Conclusions & Recommendations
Student Industrial Training is a good program to expose students to the real working-based situation.
Student will be more well-rounded; learn theoretical knowledge at campus and hands-on knowledge during internship.
Students are able to develop their soft skills; communication, critical thinking, time management etc.
Conclusions & Recommendations
Things that could be improved by UTP:
Problem: Students having problem with last-minute amendment by CSIMAL.
Possible Solution: Finalize all things before conduct internship‟s briefing.
Conclusions & Recommendations
Things that could be improved by Host Company:
Problem: Battery charging area produce unpleasant smell.
Possible Solution: Build wall-like structure to barricade those area.
That‟s It..!
