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The development of a country’s infrastructure is vital to the growth of its sectors and the overall economy. The infrastructure sector primarily comprises roads, railways, ports and airports, telecommunications, irrigation, water supply and sanitation, electricity, storage facilities, and oil and gas pipelines. Road & Highways account for the highest share in infrastructure sectors followed by railways and urban public transport.

The project of rehabilitation and up-gradation of existing 2-lane to 4-lane standards to Koida to Rajamunda approximately 53 km section of NH-215 (new NH-520) under the National Highways Development Project (NHDP) scheme, have been awarded to M/s. KMC – RKD (JV). M/s Techfab Industries Ltd. was a Reinforced Soil Wall (RSW) technology provider associated with this project.

Along this 53 km section from Koida to Rajamunda, the structure at Bimalgarh, Road Over Bridge (ROB) at chainage 245+936 was of significant importance, due to higher level differences between Koida side (A1 side) and Rajamunda side (A2 side). The maximum height of RSW required was more than 20 m at Rajamunda side (A2 side) of ROB, according to the project plan and profile. The IRC SP: 102-2014 states that if heights of RSW exceed 15 m, then walls should be designed with a berm at an intermediate height if polymeric reinforcements are used. As the height of RSW at Rajamujda side (right side) exceeded 15 m, the requirement of providing an intermediate berm arises.

Photograph of RSW on LHS side of Bimalgarh ROB

Photograph of RSW on RHS side of Bimalgarh ROB

The RSW with two types of height class were proposed at Bimalgarph ROB chainage 245+936: (a) 15.6 m of maximum height of single tier RSW at Koida side and 22.8 m of Maximum height of two-tiered RSW at Rajamunda side with 2 m wide berm. The connection between the panel and geogrid was adopted with a loop and toggle connection system.

The stability of an RSW depends on the following factors: The geotechnical properties of the foundation soil, embedment for RSW, the presence of water table in the sub-soil, infill soil materials, quality of compaction and drainage, surcharge loads, type of reinforcement, and seismic zone. RSW with T-panel was designed based on prevailing codal guidelines considering all the above factors. The geogrids were intended as a reinforcement of backfilling in this RSW. A drainage bay 600 mm thick with well-graded aggregates was suggested behind the T-panel facia to allow for smooth movement of water from the RSW. To prevent backfill material from escaping from the face, nonwoven geotextile was laid behind the facia unit.

At the Bimalgarh ROB in Odisha, our creative two-tiered reinforced soil wall has a 45,000 square meter total facing area, with 2,26,000 square meters of geogrids supplied.

Photograph of a completed structure

For further details kindly contact :

TechFab India Industries Ltd.

46&47, Maker Chambers VI, Nariman

Point, Mumbai - 400021

Tel: + 91- 22 - 2287 6224 / 6225

E: info@techfabindia.com

W: www.techfabindia.com