Kolia Bhomora Setu - Salient Features

Salient Features

Structural details :- a) Bridge:

1) Spans : 24 spans of 120m and two shore-spans discharge of 67.5 m

2) Total length : 3015m

3) Main span : Balanced cantilever Pre-Stressed concrete box –girder of 52.5m site with central R. C. C suspended span of 15 Meter.

4)Clear carriage way : 7.5m

5)Footpath :1.5m wide on either side.

6) Sub-structure: : 12.5m high hollow Circular R.C.C pier with Square pier-cap.

7)Navigational clearance : 12.0m for central 90m.

8) Foundation : 56 m deep 12m dia.

b) Guide-bund :

1) Length : 1633m on U/s and 405 m on D/S.

2) Shape : Elliptical

3) Sausage crate size : 2.55m x 1.5 m (0.90 to 1.05)

4) Top level : R.L 71.10 m

5)Top width : 9.0 m

6) Side slopes : 2.5 : 1.

7) Pitching on front slop : 1.2 m thick grouted with 1:3:6 concrete over 0.3 m thick filter.

8) Pitching on rear slope : 0.3 m thick boulders over 0.15 m

c) South Approach Bank :

i) Length : 1678 m

ii) Top width : 12.0 m

iii) Side slopes : 2.5: 1

Hydraulic data :- 1) Maximum design : 92,278 Cumecs.

2) Minimum discharge : 4,000 cumecs.

3) Design H.F.L : R.L.67.5m

4) Maximum mean Velocity : 4m/sec.

5) Average L.W.L : R.L 610m.

6) River width at bridge : 4,683m

7) Maximum design scour level a) Normal condition : R.L.24.76m b) Seismic condition : R.L.29.03m

Material consumed:

a) Bridge :

1) Total concrete quality : 1,70,000 m3

2) Total reinforcing steel : 12,000 mt

3) Cement : 82,000 mt

4) Coarse aggregate : 1,50,000m3

5) Sand :75,000m3

b) Guide-bund and South Approach Bank

1) Earth-work : 19 lakh m3

2) Stone –work : 8.2 lakh m3

3) G.I wire : 5300mt

Cost :

a) Main Bridge : Rs.44 crores.

b) Guide-bund and South Approach Bank : Rs.29.5 crores.

Contractors :

a) Main Bridge : M/S Hindustan Construction Company Ltd, Bombay.

b) Guide-bund and South Approach Bank : M/s.Jai Prakash Associates, New Delhi.

c) Bridge bearings and Expansion joints : M/S Metal Engineering & Treatment Co. (P) Ltd, Calcutta.

@@@ Assam PWD was entrusted with the job of making the road links on both side and unbelievably the whole task was completed even before the bridge was completed ahead of schedule. The main person behind was Late Lok Nath Barua(resident of Mazgoan, Tezpur), then Executive Engineer (Roads), who single handedly worked against odds. He was awarded a MEDAL of appreciation by Late Rajiv Gandhi on the inugration day of the bridge.

"American Concrete Institute" awarded the construction company of this bridge, the Hindustan Construction Company, the Certificate of Merit for the "Most Outstanding Concrete Structures" (1988).