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len aarvee associates
& consultants pvt. ltd.
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Letter No: AAi/HWNHAI/14931 74-L5 lO45
Date 19t" April, 2014.
To
The Authorised Representative
Transstroy Hoskote - Dobbaspet Tollways Private Limited,
Survey No - 208/l,Vishwanathapura (Post),
Kundana Hobli, Devanahalli Taluk,
Bangalore Rural District.- 562 110.
Sub:
- Dobbaspet Section of NH - 207 from Km 58+000 to Km 138+320
in the State of lcrnataka under NHDP-Phase-IV to be executed as BOT (Toll) on DBFOT
Basis - comments on widening Pape Culvefts from Ch,87+OOo to ch,g7+ooo and
Ch,12O+OO0 to Ch,138+OOO.
Ref:
(1) NHAI/25055/1/2014/PIU-BNG/5251, dated 26.03.2014.
(2) TrY-HDD/NHAI/CoNc/srRyHP/2, dated 19.10.2013.
(3) rTY-HDD/NHAI/CONC/srR/HP/3, dated 21.10.2013.
Four-laning of Hoskote
Dear Sir,
This has reference to your letters cited above, addressed to the Project Director, wherein you have
submitted Structural Drawings for widening Pipe Culverts from Km 87+000 to Km 97+000 and
Km 120+000 to Km 138+000. The Authority, vide its letter no. 5251 cited has forwarded your
submission for our review and comments.
Your above submission has been reviewed and our comments are aftached herein in Annexure-I to
this letter.
You are requested to comply with the comments and resubmit for our review.
With best regards
for Aarvee Associates
& Consuftants
h^.
Ltd.,
.'e\\
Authorised
Encl : Ann(
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to: The Project Director, PIU, NHAI, Bangalore
Ravula Residenc, srindgar Colony Main Rd , Hyderabad 500 089, India
Iel: +91-4A-23131633; Fax; t91-40-93136217;email: aarvee(q)adrvee net; webi wwwaarvee com
Letter Ref. No AA/HWNHAI
1
74931 74-151045,
Date 19b April, 2014.
Pipe barrel wall thickness not shown in the drawings. As per IS: 458-2003, Pipe barrel wall
thickness for NP4 pipes, shall be 125 mm and 115 mm for pipe diameter of 1200 mm and
1000 mm respectively, Hence, the same may be shown in the drawings.
4.
Length of head walls has not been shown in drawings, Cantilever length of head walls from
pipe shall be shown in drawings.
5.
The total length of culvert should be incorporated in drawings.
6.
The Edge FRL as given in the drawings do not match with the calculated FRL from median
edge after considering the camber. This may be verified at your end.
7.
The details of jointing the pipes not shown in the drawings. Details of jointing the pipes
shall be incorporated in drawings and a detailed methodology should be submitted.
not proposed under RCC encasing, wherever Pipe culverts are
proposed for full encasement. Hence, the same should be incorporated and resubmitted.
B.
PCC M15 leveling course is
9.
Number of Pipe segments to be jointed to attain the total proposed length and length of
individual pipe segments shall be shown in the drawing,
10.
Wherever the cushion height is more than 4 m, concrete shall be proposed for
bedding/cradle, as per IRC SP:13. However, in your submission, for cushion height more
than 4 m granular bedding has been proposed, Hence, the drawings should be modified to
match with SDecifications mentioned above.
11.
For Pipe culverts at Km 96+847 and Km 135+992, available cushion above the pipe at
edge of earthen shoulder is less than 0.60 m. As per IRC: SP: 8Z 0'60 m minimum cushion
shall be provided above the pipe. Hence, the FRL may be raised to meet this criteria or
alternately encasement may be proposed for these culverts.
17.
For PiDe culverts at Km 131+380 and Km 131+544, the RE wall is shown in the drawings.
The detail drawings and methodology of erecting RE wall on the pipe culverts shall be
submitted.
13.
For Pipe culverts
at Km 137+920 and Km 137+980, please indicate service road (LHS &
RHS) finished road levels in the drawings.
74.
For Pioe culverts
at Km
137+920 and Km 137+980, detailed drawings and design
calculations for chambers are not submitted'
For the PiDe culverts at Km 89+980 and Km 137+920, the proposed span
found not matching with provisions of Schedule-B' Hence, these should be
resubmitted,
Letter Ref. No' AAV/HWNHAI
1
Date 19' April, 2014.
14931 14-151045,
Annexure-I
List of Pipe Culverts:
sl.
No
Proposed
Proposed
Proposed
Design
Proposed
Treatment
Vent size Vent size
Chainage chainage as
per CA as per Treatment
as per
as
as per CA
as per CA per Drawings
Drawings
Drawings
88+238
88+238
7
x 7.20
7
x l.2O
Widening
Widening
89+890
89+890
1
x 1.00
1
x 1.00
Widening
Widening
3.
89+980
89+980
12
x 1.00
LZ
Widening
Widening
4.
91+637
9t+637
7
x 1.20
7
x 7.20
Widening
Widening
5.
93+591
93+591
4
x 1.00
4 x 1.00
Widening
Widening
5.
94+776
94+777
3
x 1.00
3
x 1.00
Widening
Widening
95+408
96+408
t2 x 7.20
8.
95+847
96+847
7
9.
120+841
120+839
2
10.
LZt+569
121+556
11.
L2l+972
72
1.
x
7.zO
12
x 1.20
Widening
Widening
x 1.00
7
x 1.00
Widening
Widening
x
1.00
2
x 1.00
Widening
Widening
10
x 1.20
10
x 1.20
Widening
Widening
72L+912
1
x 1.00
1x
1.00
Widening
Widening
124+422
124+422
3
x 1.00
3
x 1.00
Widening
Widening
13
125+006
125+055
6 x 1.00
6
x 1.00
Widening
Widening
74.
127
15.
+654
2
x 1.00
2
x 1.00
Widening
Widening
128+434
L28+434
3
x 1.00
3
x 1.00
Widening
Widening
lo.
130+308
130+308
1
x 1.00
1
x 1.00
Widening
Widening
t7.
130+646
130+545
1x
1.00
Widening
Widening
18.
130+958
130+963
2 x 1.00
2 x 1.00
Widening
Widening
19.
131+380
131+380
1
1x
Widening
Widening
+654
L27
1.00
x 1.00
131+544
20.
1x
L4
1.00
x 7.20
Widening
Remarks
Vent size not match
with CA
Not proposed in CA
zt.
134+056
134+056
1
x 1.00
I x 1.00
Widening
Widening
22.
135+992
I35+992
6
x 1.00
6
x 1.00
Widening
Widening
25.
137
+920
5
x 1.00
1x
1.00
Widening
Widening
Vent size not
matching with CA
1x
1.00
Widening
Not proposed in CA
+9ZO
L37
137+980
24.
The above submission of drawings has been reviewed and our observations are as follows:
1.
The FRL'S shown in the drawings could not be verified as the P&P and TCS drawings are
not submitted and consented.
z.
It
is suggested that the inventory of existing structures may be submitted
review process,

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