N HIGHWAY AUTHORITY
OFFICE OF (Maint), NHA
GWADAR (N).
Sub: Approval
of Engineers Estimate for Emergency Maintenance works of
Redecking of Sur Bander
Bridge at Km -497 MCH, N-
A. Case History
It is submitted that the
deck slab of subject bridge at Km MCH (N-10) was very poor and concrete of the
slab was also severely deteriorated during April, May & June 2013.
Resultantly many holes along with cracks have been occurred at Deck Slab. This
severe condition of subject Bridge has already been conveyed at various times.
2. The monsoon rains have heavily down poured during
July 2013 & resultantly flush flood water from a large catchment area has
intruded the highway at this location.
3. Such
flood flush water has heavily damaged such subject bridge slab, approach slab
and caused failure of deck slab on dated 15th July,2013 as already
mentioned through “Occurrence Report “vide
letter No.DD(M)/NHA/GWD/13/nil dated 16-07-2013. Furthermore, the approach Embankment has been settled due
to scouring and percolation of such flood water.(Photographs are more
elaborating the site condition).
4. This failure/collapse of Slabs has caused
suspension of traficullar vehicle. The road has been restored by constructing
“Diversion” through engaging the local contractor M/s Muhammad
5. The structural expert Dr.
Muhammad Iqbal has visited site and suggested for constructing new deck
slab as a replacement of old one. In
this regard he has forwarded an Engineers Estimate vide letter No.CMI/NHA/
dated 10th attached at Annex-A.
6. The items are i) 510 Dismantling of structures
and obstructions, ii) 401a1ii Concrete Class A1, iii) 4iii Concrete Class-A3,
iv) 403ii Concrete Class-A3, v) 40f lean concrete, vi) 202 Aggregate Base under approach Slab, vii)
44b Reinforcement Grade- 60, viii) NSI Latex Modified Concrete(LMC, ix) High
density PVC pipe 100 Ø for drainage etc. Furthermore, the maintenance cost of
Diversion during the project completion is also included in this Estimate.
A.
Estimated Cost
The estimated cost for above mentioned works is Rs. 7,241,901.00
B.
Schedule of Rates
The estimate is prepared based on CSR 2011.
C.
Period for completion Three months time period is
recommended for completion of proposed works in all respects.
7.
Administrative and financial approval may be solicited from Competent
Authority for subject Emergency Estimated works of i) 510 Dismantling of structures and obstructions, ii) 401a1ii Concrete Class
A1, iii) 401a3iii Concrete Class-A3, iv) 401a3ii Concrete Class-A3, v) 40f lean concrete, vi) 202 Aggregate Base under approach Slab, vii)
404b Reinforcement Grade- 60, viii) Latex Modified Concrete(LMC), ix) High
density PVC pipe 100ø for drainage x)
High density PVC pipes 29ø in approach slab xi) Bridge expansion joints
including all accessories filler and sealant xii) pavement marking in
reflective CR paint for lines of 15cm width
xiii) Repair damaged grouted abutment-1 etc amounting to Rs 7, 00
5.
Para-7/N is submitted for approval, please.
()
NATIONAL HIGHWAY AUTHORITY
OFFICE OF DY DIRECTOR (Maint),
NHA
GWADAR (N-10).
JUSTIFICATION
SCHEME IN BULLETED FORM
» The subject Engineers Estimate is for
Emergency Maintenance works of Re-decking of Sur Bander Bridge at km 496-497
MCH, N-10.
» The subject 30m single span Bridge is
about 25 years old and it was constructed prior to construction of present
Makran Coastal Highway (MCH).
» The existing deck slab was in extremely deteriorated
condition.
» The subject deck slab has been
failed on dated 15th July 2013 due to development of crater holes at
it.This failure has caused stoppage of trafficular vehicle at the subject
location.
» This necessitated for constructing
diversion which made smooth running of trafficular vehicle at the subject
location.
» The structural expert Dr. Muhammad Iqbal
has visited site and suggested for constructing new deck slab as a replacement of old one.
» In this regard an Engineers
Estimate is made for Dismantling of existing structures (slab), Re-decking of
subject Bridge slab, Granular Sub-base, Aggregate Base, DST, Dense Graded Hot
Bitmac etc.
Deputy Director(Maint) NHA,
Gwadar
Sur Bandar Bridge km 496-497 on N-10
Name of contract:
Emergency Maintenance works of Redecking of Sur Bander Bridge
Location
: Km 496-497 MCH, N-10
ABSTRACT
OF COST & QUANTITIES
|
Sr No
|
Item #
|
DESCRIPTION
|
UNIT
|
QTY
|
Rate (Rs)
|
Amount (Rs)
|
|
i
|
401a1ii
|
Concrete class A1(on
ground)
|
CM
|
21
|
10,734.67
|
228,343
|
|
ii
|
401a3iii
|
Concrete class A3(elevated)
|
CM
|
71
|
11,850.95
|
839,936
|
|
iii
|
401a3ii
|
Concrete class A3(on
ground)
|
CM
|
21
|
11,475.22
|
240,980
|
|
iv
|
401f
|
Lean concrete
|
CM
|
9
|
5,908.88
|
53,109
|
|
v
|
201
|
Granular sub base
|
CM
|
63
|
1,801.43
|
113,490
|
|
vi
|
202
|
Aggregate Base
|
CM
|
101
|
2,131.66
|
214,871
|
|
vii
|
304b
|
DST
|
CM
|
120
|
396.79
|
47,615
|
|
viii
|
307a
|
Dense graded hot bitmac
|
CM
|
23
|
10,456.45
|
243,426
|
|
ix
|
NSI
|
Latex Modified
Concrete(LMC)
|
CM
|
12
|
27,778.24
|
323,339
|
|
x
|
404b
|
Reinforcement as per
(AASHTOM-31 Grade- 60)
|
Ton
|
12
|
98.609.32
|
1,177,765
|
|
xi
|
510
|
Dismantling of structures
and obstructions using pneumatic
|
CM
|
138
|
1,284.37
|
176,601
|
|
xii
|
607a
|
Traffic road signs
category-1
|
Each
|
2
|
12,187.22
|
24,374
|
|
xiii
|
NSI
|
High density PVC pipes 100
Ø for drainage
|
M
|
15
|
349.63
|
5,244
|
|
xiv
|
NSI
|
High density PVC pipes 29 Ø
in approach slab
|
M
|
34
|
210.25
|
7,064
|
|
xv
|
NSI
|
Bridge expansion joints including
all accessories filler and sealant
|
M
|
19.80
|
30,053.00
|
595,049
|
|
xvi
|
608h1
|
Pavement marking in
reflective CR paint for lines of 15cm width
|
M
|
169
|
62.17
|
10,486
|
|
xvii
|
NSI
|
Repair of damaged grouted
abutment 1
|
LS
|
1
|
300,000.0
|
300,000
|
Total without diversion Rs
4,601,785.00
|
xviii
|
NSI
|
Maintenance of diversion
through out the project completion time
|
Months
|
3
|
880,038.90
|
2,640,117
|
Grand Total including diversion
Rs. 7,241,901.00
ENGINEER’S ESTIMATE
Sur Bandar Bridge at km 496+00 to 497+00 N-10
Name of contract: Emergency Maintenance works of Redecking of Sur Bander Bridge
Location : Km 496-497 MCH, N-10
PRE-MEASUREMENT
FORM
|
ITEM
|
DESCRIPTION
|
UNIT
|
NO
|
L
|
B
|
H
|
QTY
|
REMARKS
|
|
401a1ii
|
Concrete class A1 (on ground)
|
CM
|
|
|
|
|
21.3
|
|
|
|
Barrier
|
CM
|
2
|
38
|
Area
|
0.28
|
21.3
|
|
|
|
|
|
|
|
|
|
|
|
|
401a3iii
|
Concrete classA3(elevated)
|
CM
|
|
|
|
|
70.9
|
|
|
|
Deck slab
|
CM
|
1
|
30
|
10.5
|
0.225
|
70.9
|
|
|
|
|
|
|
|
|
|
|
|
|
401a3ii
|
Concrete class A3 (on ground)
|
|
|
|
|
|
21
|
|
|
|
Approach slab
|
CM
|
2
|
11
|
4.0
|
0.025
|
21
|
|
|
|
|
|
|
|
|
|
|
|
|
401F
|
Lean concrete
|
CM
|
|
|
|
|
9
|
|
|
|
Under approach slab
|
CM
|
2
|
11
|
4.2
|
0.10
|
9
|
|
|
|
|
|
|
|
|
|
|
|
|
201
|
Granular subbase
|
CM
|
|
|
|
|
63
|
|
|
|
For approach road
|
CM
|
1
|
40
|
10.5
|
0.15
|
63.0
|
|
|
|
|
|
|
|
|
|
|
|
|
202
|
Aggregate base
|
CM
|
|
|
|
|
100.8
|
|
|
|
Under approach slab
|
CM
|
2
|
11
|
4.0
|
0.20
|
16.8
|
|
|
|
Under approach road
|
CM
|
1
|
40
|
10.5
|
0.20
|
84.0
|
|
|
|
|
|
|
|
|
|
|
|
|
304b
|
Double surface treatment
|
SM
|
|
|
|
|
120
|
|
|
|
On approach road shoulders
|
SM
|
2
|
40
|
1.5
|
|
120
|
|
|
|
|
|
|
|
|
|
|
|
|
307a
|
Dense graded hot bitmac
|
CM
|
|
|
|
|
23
|
|
|
|
Approach slab
|
CM
|
2
|
4
|
9.7
|
0.05
|
3.9
|
|
|
|
On approach road
|
CM
|
1
|
40
|
9.7
|
0.05
|
19.4
|
|
|
|
|
|
|
|
|
|
|
|
|
404b
|
Reinforcement as per (AASHTO M-31 grade 60)
|
Ton
|
|
|
|
|
11.94
|
|
|
|
|
|
|
|
|
|
|
|
|
510
|
Dismantling of structures and obstruction using
pneumatic hand held concrete breakers only
|
|
|
|
|
|
137.5
|
|
|
|
Existing Deck Slab
|
CM
|
1
|
30
|
9.50
|
0.30
|
85.5
|
|
|
|
Barrier
|
CM
|
2
|
30.6
|
0.68
|
0.85
|
35.2
|
|
|
|
Approach slab
|
|
2
|
10.5
|
4.00
|
0.2
|
16.8
|
|
|
NSI
|
Latex modified concrete
|
CM
|
|
|
|
|
11.6
|
|
|
|
Deck slab
|
CM
|
1
|
30
|
9.7
|
0.04
|
11.6
|
|
|
|
|
|
|
|
|
|
|
|
|
607a
|
Traffic road signs category
|
EACH
|
2
|
|
|
|
2
|
|
|
|
|
|
|
|
|
|
|
|
|
NSI
|
High density PVC pipes 100 Ø
for drainage
|
M
|
2
|
30
|
3.0
|
0.75
|
15
|
|
|
|
|
|
|
|
|
|
|
|
|
NSI
|
High density PVC pipes 29 Ø
in approach slab
|
M
|
2
|
10.5
|
35.0
|
0.48
|
33.6
|
|
|
|
|
|
|
|
|
|
|
|
|
NSI
|
Bridge expansion joints
including all accessories filler and sealant
|
LM
|
2
|
9.9
|
|
|
19.8
|
|
|
|
|
|
|
|
|
|
|
|
|
608h1
|
Pavement marking in reflective
CR paint for lines of 15cm width
|
M
|
|
|
|
|
169
|
|
|
|
|
|
|
|
|
|
|
|
|
NSI
|
Maintenance of diversion
through out the project completion time
|
Months
|
3
|
|
|
|
3
|
|
|
|
|
|
|
|
|
|
|
|
|
NSI
|
Repair of damage grouted
abutment-1
|
l
|
1
|
|
|
|
1
|
|
|
|
|
|
|
|
|
|
|
|
