7/27/2019 Work Improvement
1/14
CE 5806 - Construction Project & Site Control 0
Improvement of work flow for lifting of Insulation Material with Tower Crane
Improvement of work
flow for lifting of
Insulation Material
with Tower Crane
CE5806 Construction Project
& Site Control
Presented By
Allan Tay Eng Mian A010
Diwakar Velu A0104260X
Song Zujiang A0103244X
Suresh Lakshana A0103323B
Thirunavukkarasu Thayathan A010
http://www.google.com.sg/imgres?q=nus+logo&um=1&hl=en&sa=N&biw=1920&bih=999&tbm=isch&tbnid=dRIytVAHmwmNqM:&imgrefurl=http://www.siiaonline.org/?q=events/visions-a-region%E2%80%99s-future-south-asia-2060&docid=fUq8DbIPvmvMIM&imgurl=http://www.siiaonline.org/files/u3709/NUS_LOGO_-_blue.jpg&w=500&h=262&ei=RH-9TqDaH4jZrQfC9628AQ&zoom=17/27/2019 Work Improvement
2/14
CE 5806 - Construction Project & Site Control 1
Improvement of work flow for lifting of Insulation Material with Tower Crane
CHAPTER 1: INTRODUCTION
1.1 Background Information
The Down Town Line is one of the on-going MRT project that is being constructed in Singapore
Government to ease the traffic congestion. This line is connecting Bukit Panjang to the Expo for
40 kms and is one of the important project in terms of completion and the cost considered .Hence
it is very important that the work is carried out effectively and efficiently.
Figure 1. The Down Tine LIne
7/27/2019 Work Improvement
3/14
CE 5806 - Construction Project & Site Control 2
Improvement of work flow for lifting of Insulation Material with Tower Crane
Scope of Work Improvement:
The scope of the work improvement report is to analyse a particular construction activity and
show the result of one of cycle of work. This will discuss the problems that are faced such as idle
labours, resource managing etc.. due to the current condition as seen in the video submitted. This
work improvement is done in the following steps
Activity Considered
Actual Work Analysis
Thinking over an ideal Solution
Resolved Problem Analysis
The recommendation for improving the process of the workflow cycle will be given in this report
with a detailed analysis and study. This is a concept of Lean construction.
2.1 Work Description
The video taken is to monitor a DOWN TOWN LINE MRT Project. This is particularly focussed
on the lifting of Insulation Materials at the Bukit Batok Depot for the covering of the roof in
order to reduce the heat affect. This is being shifted with the help of a Tower Crane and Helpers.
Lean Concept
7/27/2019 Work Improvement
4/14
CE 5806 - Construction Project & Site Control 3
Improvement of work flow for lifting of Insulation Material with Tower Crane
Objective:
The objective of the work analysis done for the above mentioned activity is as follows
Reduce idle time of work men
Manage the Tower Crane Effectively
Reduce the manpower if necessary
Activity Considered:
The work to be done in the situation taken is to shift a 200 Rolls of Insulation coils to the roof of
the Bukit Panjang MRT where it is to be spread over. The stock is arrived and has been stored at
the ground level.
As in this case it is planned to be shifted with the help of a tower crane. Two workmen are
bought in along with a supervisor and a signal man .The characters are as shown in the video
below.
7/27/2019 Work Improvement
5/14
CE 5806 - Construction Project & Site Control 4
Improvement of work flow for lifting of Insulation Material with Tower Crane
Actual Work Analysis :
Below shows the snapshot of the actual work sequence that is to be carried out and the time at
which the particular activity is done and what is the status of the workmen
Scene 1 :
Scene 2:
This scene shows the helpers
loading the material on the rope
for lifting
TIME NOW : 02:10
This scene shows the materials
fully loaded and lifted
TIME NOW : 03:01
7/27/2019 Work Improvement
6/14
CE 5806 - Construction Project & Site Control 5
Improvement of work flow for lifting of Insulation Material with Tower Crane
Scene 3:
Thus from the above analysis it is found that
Manpower gets idle once the load is sent. This is because they do not have an extra
loading SLING/ROPE.
Tower Crane gets idle as material needs to be loaded.
A table showing the cycle time study is given below.
This scene shows the workmen
are idle as the crane being at the
top
TIME NOW : 04:52
7/27/2019 Work Improvement
7/14
CE 5806 - Construction Project & Site Control 0
Improvement of work flow for lifting of Insulation Material with Tower Crane
Average Actual Time cycle with 1 hook and 2 helpers
Total Duration 10:20
Nos Shifted 14.00
DescriptionSta
rt
En
d
Du
r
Signal man Lifting Supervisor Helper1 Helper2 Crane
Working Time
Working
contributary Idle Time Working Time Idle Time Working Time Idle Time Working Time Idle Time Working Time Idle Time
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Sta
rt
En
d
Du
r
Arrangement of
lifting Sling
00:
00
00:
21
00:
21
00:
00
00:
21
00:
21
00:
00
00:
21
00:
21
00:
00
00:
21
00:
21
00:
00
00:
00
00:
21
00
21
Loading of
materials on to
Sling
00:
21
02:
10
01:
48
00:
21
02:
10
01:
48
00:
21
01:
41
01:
20
00:
21
01:
41
01:
20
00:
00
02:
13
02:
13
00:
21
02:
10
01
49
hooking back 02:10 03:01 00:51 02:10 03:01 00:51 01:41 02:32 00:51 01:41 02:20 00:39 02:13 02:32 00:20 02:10 03:01 0051
Lifting up of Sling
03:
01
04:
52
01:
51
03:
01
04:
52
01:
51
02:
32
04:
52
01:
51
02:
20
04:
52
02:
04
02:
32
04:
52
01:
51
03:
01
04:
52
01:
51
Unloading
04:
52
09:
29
04:
36
04:
52
09:
29
04:
36
04:
52
09:
29
04:
36
04:
52
09:
29
04:
36
04:
52
09:
29
04:
36
04:
52
09:
29
04
36
lowering of Sling
09:
29
10:
20
00:
52
09:
29
10:
20
00:
52
09:
29
10:
20
00:
52
09:
29
10:
20
00:
52
09:
29
10:
20
00:
52
09:
29
10:
20
00:
52
Total
10:
20
00:
51
03:
04
06:
25
01:
12
08:
39
02:
20
07:
31
02:
13
07:
39
02:
43
07
37
7/27/2019 Work Improvement
8/14
CE 5806 - Construction Project & Site Control 0
Improvement of work flow for lifting of Insulation Material with Tower Crane
Based on the work carried out and the above calculations, a detailed pie chart is prepared and
plotted as shown below. This gives a detailed report on percentage of idle time and effective
work done,
Working Time22%
Idle Time
78%
Helper 2
Working Time
Idle Time
Working Time
26%
Idle Time
74%
Crane
Working Time
Idle Time
7/27/2019 Work Improvement
9/14
CE 5806 - Construction Project & Site Control 1
Improvement of work flow for lifting of Insulation Material with Tower Crane
IDEAL SOLUTION:
From the problem analyzed and the cycle time considered the following strategy is used
Usage of 3 Nos Sling/Rope instead of One.
Reducing a workmen considering the crane rotation time.
Usage of 3 Slings:
The sequence of work done is as follows
When crane is lowered material are loaded and hooked for lifting with Sling 1.
Meanwhile the workmen start loading in the Sling 2
Now as and when the crane is lowered the Sling 2 is hooked and sent without idling the
crane for loading.
Repeating the same process
Reducing the Manpower:
After implementing this idea it is observed that the helpers remained ideal as the crane rotation
time is found to be more 2mins 24 secs, the loading time with 2 helpers . In order to reduce this
time , we replaced 2 workmen by just one 1 Helper. This reduced the ideal time and managed
the tower crane rotation time.
Working Time
25%
Idle Time
75%
Total
Working Time
Idle Time
7/27/2019 Work Improvement
10/14
CE 5806 - Construction Project & Site Control 0
Improvement of work flow for lifting of Insulation Material with Tower Crane
A flowchart showing the above operation is given below:-
Based on this proposal, A cycle time table that is prepared is attached herewith.
7/27/2019 Work Improvement
11/14
CE 5806 - Construction Project & Site Control 0
Improvement of work flow for lifting of Insulation Material with Tower Crane
Proposed Time cycle with 3 hooks & 1 helpers
Total Duration 12:34
Increase in
efficiency 60%
Nos Shifted 42.00
DescriptionSta
rtEnd Dur
Signal man Lifting Supervisor Helper1 Crane
Working Time
Working
contributary Idle Time Working Time Idle Time Working Time Idle Time Working Time Idle Time
Sta
rtEnd Dur
Sta
rtEnd Dur Start
En
d
D
ur
Sta
rtEnd Dur
Sta
rtEnd Dur
Sta
rtEnd Dur
Sta
rtEnd Dur Start End Dur
Sta
rtEnd Du
Unlocking of Sling 1
00:
00
00:
21
00:
21
00:
00
00:
21
00:
21
00:
00
00:
21
00:
21
00:
00
00:
24
00:
24
00:
00
00:
21
00
21
hooking & Lifting up of
Sling 2
00:
21
03:
03
02:
42
00:
21
01:
12
00:
51
01:
12
03:
03
01:
51
00:
21
00:
51
00:
30
00:
51
03:
03
02:
12 00:51
03:
03
02:
12
00:
21
00:
51
00
30
unhooking of Sling 2,
hooking & lowering of
Sling 3
03:
03
04:
24
01:
21
03:
03
04:
24
01:
21
04:
03
04:
24
00:
21
03:
03
04:
03
01:
00
04:
24
04:
27
00:
03 03:03
04:
24
01:
21
Loading of materials on
to Sling 1
00:
24
04:
24
04:
00
00:
24
04:
24
04:
00
04:
24
04:
54
00
30
hooking & Lifting up of
Sling 1
04:
28
07:
10
02:
42
04:
28
05:
19
00:
51
05:
19
07:
10
01:
51
04:
24
04:
54
00:
30
04:
54
07:
10
02:
16 04:54
07:
10
02:
16
unhooking of Sling 1,
hooking & lowering of
Sling 2
07:
10
08:
31
01:
21
07:
10
08:
31
01:
21
08:
10
08:
31
00:
21
07:
10
08:
10
01:
00
08:
27
08:
31
00:
03 07:10
08:
31
01:
21
Loading of materials on
to Sling 3
04:
27
08:
27
04:
00
04:
27
08:
27
04:
00
08:
31
09:
01
00
30
hooking & Lifting up of
Sling 3
08:
31
11:
13
02:
42
08:
31
09:
22
00:
51
09:
22
11:
13
01:
51
08:
31
09:
01
00:
30
09:
01
11:
13
02:
12 09:01
11:
13
02:
12
unhooking of Sling 3,
hooking & lowering of
Sling 1
11:
13
12:
34
01:
2111:
13
12:
34
01:
21
12:
13
12:
34
00:
21
11:
13
12:
13
01:
00
12:
31
12:
34
00:
03 11:13
12:
34
01:
21
Loading of materials on
to Sling 2
08:
31
12:
31
04:
00
08:
31
12:
31
04:
00
Total
02:
33
09:
57
No idle
time
02:
54
09:
40
12:
00
00:
34
10:
43
01
51
7/27/2019 Work Improvement
12/14
CE 5806 - Construction Project & Site Control 0
Improvement of work flow for lifting of Insulation Material with Tower Crane
A pie chart showing the effective work time & idle time for the proposed work is given below
Working Time
76%
Idle Time
24%
Total
Working Time
Idle Time
7/27/2019 Work Improvement
13/14
CE 5806 - Construction Project & Site Control 1
Improvement of work flow for lifting of Insulation Material with Tower Crane
The Comparison of the actual & proposed work is as shown in the bar chart below.
Thus from the analysis it is seen that
S.No Item Actual Proposed
1 Cycle Time 10 m 20 s 12 m 34 s
2 No of rolls transferred 14 42
3 % of working time 25% 76%
4 % of idle time 75% 24%
5 % of productivity increase 60%
62%
88%
76%
78
%
74%
75%
0%
77%
4% 1
5%
24%3
8%
12% 2
4%
22%
26%
25%
100%
23%
96%
85%
76%
0%
20%
40%
60%
80%
100%
120%
Actual Idle Time
Proposed Idle time
Actual Working Time
Proposed Working time
7/27/2019 Work Improvement
14/14
CE 5806 - Construction Project & Site Control 2
Improvement of work flow for lifting of Insulation Material with Tower Crane
CHAPTER 5: CONCLUSION
Thus from the work analysis it is see that the small tool has reduce particular cost and
time in the project.
Hence all small activity also must be studied prior t and a proper o being carried out and
analysis is to be done on order to avoid the above.
REFERENCES