cEG/NG pByp/Stru -rl 320-2016/ TOe z

CONSULTINGENGINEERS GROUP LTD

An l3O 9001 : 2008 Company

House No. 131211313, Deshpande Layout,Behind Day 2 Day Super Market,Wardhaman Nagar, NAGPUR - 440008.TelNo. 0712 - 2761115, Fax No. 2761117.Email : ceg*nagpur@cegindia. comCIN: U74140 RJ199'1 P1C006329To,

Director (Projects),M/s Oriental Nagpur Bypass Construction Pvt. Ltd.Site office at Nagpur Umred Road,Outer Bypass, Tah - Kamptee,

17th June 2016

Dist - Nagpur

Sub: Independent Engineer Services for 4 laning of Madhya pradesh / MaharashtraBorder Nagpur section of MH-7 from Km. 652.000 (New Km. 653.225) to Km,729'0oo including construction of Kamptee - Kanhan and Nagpur Bypass andMaintenance of already 4 Laned section from Km.14.585 to Km.36.6000 NH-7(Nagpur - Hyderabad Section) in the State Maharashtra under NHDp phase-Il onDBFOT Basis.

Reg: observation on Foundation and substructure for AIlp.Ref: Yourletter No. ONBCPL/NBP/NH-7/CEG-IE/2OI6/4|O7dated 13/06/2016.Dear Sir,

Our observations and comments on foundation and substructure for AUp are as follows.1. Following Drawings pertaining to AUP at Ch. 656+340,659+7I0,675+BO0 have been

reviewed by us and our observations/action to be taken by you, are given in succeedingparas:-

Span ---> 1x30.0m

ComponentDocument:Design Drawing

656+340,659+710675+800

GAD

FVPL- N H - 7. BP.AU P-656 + 340-GA-001(1ro6)FVPL- N H. 7- BP-AU P-659 +7 1 O-GA-001(1TO4)FVPL- N H - 7- BP-AUP-6 57 +BOO-GA-001(1T06)

Pier & Piercap

1, Design offou ndationbelow 7m ofstem height.2, Design .offoundationAbove 7m ofstem height.

FVPL- N H -7- BP-AUP-6 56 + 340- PI ERGAD-OO1FVPL-N H-7-BP-AUP-656+340-PIERREF-OO1FVPL- N H-7- BP-AU P- 656 + 340- PIERREF-OO2FVPL- N H.7- BP-AU P-6 59 + 7 1 O- PI ERGAD-OO1FVPL-N H-7-BP-AUP-659+7 1 O-PIERREF-OO1FVPL- N H-7- BP-AU P- 659 + 7 1 O- PIERREF-OO2FVPL- N H-7- BP-AU P- 657 +BOO- PIERGAD-OO1FVPL-NH-7-BP-AUP-657 +BOO-PIERREF-OO1FVPL- N H-7- BP-AU P- 657 +BOO- PI ERREF-OO2

2. General Comments

a) Design and reinforcement detail for approach slab shall be submitted for our review.

b) Miscellaneous drawings shall be submitted for our review

3, General Arranoement Drawinos

c) Circular pier with open foundation arrangement are provided while in note no .16 RCC

wall type abutment is mentioned. Kindly reconcile.

d) Design has been done as per Elastomer bearing but POT-PTFE bearing is mentioned in

GAD. Please correct.

e) Expansion gap shown as 20mm at abutment location, the calculation of expansion and

contraction gap may kindly be submitted for our review.

f) 5500mm vertical clearance shall be archived where BT Road is available (P23-P24).

g) In detail Y & Z, the depth of girder is shown up half portion of the deck slab. Kindly

correct.

h) Reference drawing number shall be mentioned in GAD.

i) Note no. 6 is showing Strip Seal type expansion joint is provided while Modular type

expansion joint is shown in detail Y (Sheet 4 of 6).

j) Size of pedestal shall be shown in GAD.

k) Deck continuity shown for some span ,it shall be provided for total span for better

ridding quality .

4. Desiqn of sub-structure for oier of heiqht.up to 7m & Reinforcement Drawinq

a) It should be clearly mentioned on drawing that drawing will be applicable for pier

marked (Pt -P24) which is fall under 7m height of pier. The same shall be mentioned

on design note also.

b) A page showing height of pier from

included in design note with table

Founding Level etc .

c) It is recommended to provide POT-PTFE bearing.

d) Link slab joining deck from both sides shall also be checked for rotation, deflection due

to self-weight, SIDL, live load, creep & shrinkage

e) Xumax shall be calculated as per IRC: SP 105-2015

0 Flexural reinforcement in footing shall be calculated using Effective width as (b+(B-

b)/B) --- b = Top width of footing, B = Bottom width of footing.

g) Compression reinforcement in bottom face of pier cap provided in drawing is not

matching as per the design (kindly refer page no.54 of pdf).Kindly reconcile.

h) Bar marked 13 -16dia 2legged is provided in drawing while 16dia 4legged considered

in design .Kindly Reconcile.

i) It has been observed that in Longitudinal moment case ,transverse moment considered

is zero which is not possible .Kindly include the load factor considered in design with

combinations as per IRC :6-2014.Page 2 of3

P1 TO P24 (for AUP AT CH.656+340) shall be

comprises of FRL ,Pier Cap level Ground Level

j) It is also observed that in span dislodged case, weight is considered half which is notpossible, weight of super-structure may be half but weight of sub-structure will besame.

k) Design of pier for deck continuity is missing.l) In design note, page 42 of pDF, some texts are missing.m) Base pressure shall be checked with gross bearing with weight of footing and soil over

footing.

n) It has been observed that vertical load in Qp is 1086T & 1266.2T in Basic combinationwhich is not possible .Kindly recheck again.

o) 35olo increase in seismic forces is not done. Kindly refer page no.94 & 95.p) Increase in permissible stresses shall not be done by permitted by IRC :112,Kindly

refer page no.95& 99.q) Factored design moment considered as Mst which shall be corrected for Mrare & Mqp.r) Lap length shall be calculated as per IRC :112s) A section to be cut at mid portion of the column shall be shown in reinforcement

drawing of pier & pier cap.

t) Bent up details of circular stirrups provided in pier shail be shown.u) shape for main bar marked 15 is looking like links .Kindly correct.v) Bar marked 12 is missing in sec A-A (FVPL-NH-7-BP-AUP-656+3OO-PIER REF-001 _

Sheet I ot 2).

w)

x)

v)

z)

5.

Pedestal shall also be checked as a corbel and same shall be included in design note.Bearing below approach slab shall be provided.Expansion joint between approach srab & dirt wail shail be shown.Reference drawings shall be shown.

aa)Above mentioned comments for Design of sub"structure for pier of height up to 7m areapplicable.

You are advised to take note of the foregoing observations and submit the reviseddrawings and compliance.

Thanking you,

Yours faithfully,

cc: 1. Project Director, NHAI, pIU, Nagpur - for information prease.2. Team Leader,pMC, Nagpur _ foi'information pieaie.3' sh Nirmal Jit singh, Executive Director, cEG, New Delhi - for information please4' Director (projects), HQ cEG Jaipur - for information prease.

K.H.Wf,ghmare

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