Innovating to Meet Next-gen Challenges
Development of new Armour Block: Breakwaters are constructed in the sea to absorb the energy of oncoming waves, so that the waters in the basin in the lee of the structure are tranquil. The basin can be utilized for handling vessels to load/unload cargo. Breakwaters should be able to withstand the onslaught of the waves, without undergoing distress themselves.
NEC has developed a new Armour Block named “Kolos”. According to tests, its stability coefficient is the highest in the world, i.e. 32. The blocks have excellent interlocking characteristic. It has the distinction of being the first Armour Block to be awarded a patent in India. It facilitates NEC’s powerful thrust into the field of harbour engineering.
NEC has developed a Kelly Bar with Grab to maintain alignment during the construction of diaphragm walls.
NEC has developed in-house Reverse Mud Circulation (RMC) rig with 10 t capacity free-fall double drum winch, to chisel through hard rock strata to execute diaphragm wall trenches.
NEC has developed, in house, a post tensioned concrete diaphragm wall for berthing structure - the first of its kind in the world. With the arrangement of post tensioning, substantial reduction in concrete and steel quantity is achieved. Besides, the pre-compression results in corrosion protection in a marine environment, due to absence of cracks in the structure.
NEC has developed a tension pile with a mechanism to accommodate horizontal movement without transferring any horizontal force or moment to the pile. The tensile load is applied to the pile cap on top. The pile is connected to the pile cap by means of a few high tensile strands, anchored at the anchor head at the top of the pile cap. The strands pass through a corrugated duct; the duct is grouted with cement grout to guard against corrosion. In the pile, the duct passes through a larger diameter PVC sleeve to facilitate movement of the duct inside it. The sleeve has seals against wet concrete at top and bottom, while compressible polythene board is provided between the pile top and the pile cap bottom to prevent vertical downward load from passing on to the pile.