Civil
Abir is an established name, known for civil works. Since its inception it has established and is maintaining the international technical standards for execution of Civil Works. It has highly experienced manpower and world class equipment for all types of Civil works, such as Geo-technical Investigation, Slope Stabilisation, Underground works, fabrication and erection of penstocks, Shaft-Sinking, Dam and Barrage works, Power House construction and Infrastructure.
The works at a glance are -
A. 2 x 50 MW Malana – II Hydro Electric Project, Himachal Pradesh
- Dam (158.5m Long and 45M High): Total excavation of 125000 M3 and 13500 M3 has been done in Dam foundation and in the diversion channel respectively. One coffer dam has been constructed for diversion of river and 63088 m3 of concreting in dam body has been completed so far.
- MAT(6MX 6M): Main Access Tunnel of 382 RM has been completed.
- TRT (5MX6.25M): Tail Race Tunnel of 365RM with lining (2600m3 concreting) has been completed.
- HRT (2.9MX 2.9M): Excavation of 4613 out of 4640RM and lining of 1461 RM has been completed.
- Surge Shaft(6M Dia): The excavation work of 87 m long 6 m dia Surge Shaft has been completed so far.
- Vertical Pressure Shaft ( 2.5M Dia): The excavation work of 564 m deep 2.5 m dia Pressure Shaft has been completed so far.
- Power House( 67.5X17.5X35.85 M): The Power House work consisting of excavation of 32000 M3 in Power House cavern and 4000 M3 in Transformer Cavern and concreting of 5000M3 in Power House cavern and 500M3 in Transformer cavern has been completed along with all the machine installations.
B. 2 x 2.5 MW Sainj Hydro Electric Project, Himachal Pradesh
- Barrage: In barrage structure total excavation of 1580M3 with Concreting of 3600M3 has been done so far.
- HRT (1.9X2.25 M): The HRT of 1900RM with Lining has been completed.
- Surge Shaft (4M dia): 2200M3 of excavation and 200 M3 of concreting have been done in Surge shaft so far.
- Pen Stock: Excavation of 1900M3 with concreting of 400M3 completed.
- TRC: Excavation of 1650M3 with concreting of 96M3 completed.
- Power House( 32.2X15.25X14.38 M): The surface power house consisting 3000M3 of excavation and 1292M3 of concreting along with all civil works is complete.
C. 6 x 200 MW Teesta III Hydro Electric Project, Sikkim
- HRT (7.5M Dia, Horse Shoe Shape): Out of 11921 RM of HRT 4636RM excavation and 4 No’s portals have been completed.
- Adits(7mX7m): All thel 7 No of Adits totaling to 3257 RM, have been completed.
- Pressure shaft (4.0 m Dia): Out of 852RM of Horizontal pressure shaft, 231 RM excavation is complete and out of 1460RM of vertical Pressure shaft 18 RM excavation has been done.
- MAT ( 8M X 8M): Excavation of 589 RM of MAT is complete.
- Cable Tunnel (8MX 8M): Excavation of 665 RM of CT is complete.
- TRT (8MX8M): Out of 800Rm of TRT 431 RM excavation has been done.
- Power House: In power house cavern having size 220.5X21.5X48 M, out of 183200 Cum of excavation, 53070Cum has been done. Whereas in Transformer Cavern having size 172X16X28m, out of 86550 cum of excavation 9765 cum has been completed so far.
- Infra works: So far 28 kms of road has been constructed. Out of 15000sqft of Office buildings so far 14100 sqft have been constructed. Also 38500 sqft of prefabricated structures and 23600 sqft of main colony have been completed.
D. 2 x 8 MW Patikari Hydro Electric Project, Himachal Pradesh
This project was completed with the following salient features :
- HRT: 1.8mX2.1m having total length of 3614 RM.
- Surge Shaft: 3M steel lined.
- Penstock: 1.3m dia before bifurcation and 0.9m after bifurcation with a total length of 677.06M.
- Power house: Surface Power house with Dimensions 50.57X14.2m
E. 3000 Demwe HEP in Distt. Lohit, Arunachal Pradesh
- Construction of temporary culverts/Bridges in pathways at Lower and Upper Demwe sites: Out of 30 No’s construction of 12 No culverts/Bridges have been done.
- Construction of new pathways at Lower and Upper Demwe site:
- Tunnels: So far 830RM of tunnel (2.5MX2.2M) have been excavated at different locations as per the instructions of Engineer-in-Charge. All the constructions have been as per the specifications as mentioned in TS.
F. Sinking of Vertical Shafts in Teesta-III HEP
- Scope of work: Teesta-III is a 6 x 200 MW hydro project has two circular pressure shafts of 4.5 meters diameters and a depth of 650 meters with a design discharge of 87.5 cum through each shaft and a velocity of 6.963 m/sec. Pressure shafts are one of the critical areas of work at Teesta-III taking into consideration the geological & topographical features which after various geo-technical evaluations have come out to be a mixture of broadly fair (Class III) rock mass with some with good (class II) rock and some poor (Class IV) zones.
- Contractor: M/s Shaft Sinkers (Pty) Ltd, South Africa.
- Design & Technical Assistant: METS (Mining & Technical Services), the design & consulting division of Shaft Sinkers.
- Headgear Design: The Headgear is designed to accommodate the safe hoisting of blasted muck and the transporting of the personnel, equipment and material necessary for the operation. The headgear and the sinking stage will be pre-assembled, marked and then transported through the tunnel to the shaft.
- Pre-sink: The excavation to ± –65.0 meters will be sunken making use of a pre sink frame, mounted on the hanging wall above the bank level and below the excavated headgear. Hand-held drilling machines and conventional blasting techniques will be used. Sidewall support will be carried out concurrently during the excavation phase with 75mm thick reinforced wetcrete. Before pre-sink commences, a 4-hole by 36 m in depth cover round will be drilled by using the 4-boom Jumbo drill rig. Wetcrete and rock bolts will be used as support. .
- Main Sink: The Contractor will provide suitable double drum winders to sink the shafts to the required depths as well as 8 Dymot winches suitable to suspend the stage which will be used to carry out support works like wetcrete & installation of air & pipe lines.
- Specialized equipments: Winders, Winches, Sheaves, Drill rigs, Headgear, Control panels etc.
|
