The construction of a new bridge is always synonymous with connecting people. With this new project based from Shirsad – Masvan section of Vadodara Mumbai Expressway, Casagrande is drilling to connect and build an eight lane access controlled expressway.
The foundation work project consists of a total of 856 piles with diameters ranging from 1200 to 1500 mm up to 25 m depths. 520 piles are on land, and 336 piles are in water, all drilled for socketing in hard rock – Basalt – from 3.5 m to 5 m.
This site is employing two drill rigs: the Casagrande B250XP-2 and B300 XP-2.
GR Infra Projects Ltd has selected the two rigs for their specific features: high torque of rotary head to encounter hard rock, weight of rig according to the weight limitation on pontoon, extraction force of rig suitable for bigger height of tools (i.e. core barrel with rollers of 3 m height) to achieve better productivity.
This project is one of the critical projects for GR Infra Projects Ltd which have to be completed within the time period of 1 year and in this jobsite, they have to drill thru very hard rock having UCS value ranging from 80 Mpa to 150 Mpa – said Mr. Dharmendra Singh – Piling Head GR Infra Projects Ltd.
The two queens, top tier models in the Casagrande’s range with outstanding performances in the 80 and 100 t classes, are arranged here in bored piling mode with interlocking kelly bars and crowd ram feed system.
Thanks to its excellent stability, wide tracks, reduced swing radius and high working radius, the B300xp-2 has been chosen to operate from a pontoon in the middle of the river. The basement of the new bridge will bear on piles ø1500 mm diameter and up 17-19 m deep in weathered rock and hard rock. The casings are installed by a vibrator mounted on auxiliary crane to get inside about 10 m of water.
The B250xp-2 is piling ø1200 mm diameter piles up to 20-23 m depth in softer soil, weathered rock and hard rock. The combination of optional main winch with 335 kN nominal line pull, the powerful H26 rotary head, the heavy-duty crowd ram system, 3 and 4 elements interlocking kelly bars and the Casagrande experience in supplying the proper drilling tools makes the operation easy and fast.
Casagrande has provided the tooling best suited for this project to tackle hard rock. The tools used are 3 m long Core Barrel with Rollers, Double Layer Core Barrel with Rollers, Special Rock Auger for hard rock (UCS up to of 100 Mpa) and Cross Cutter.
The Casagrande B250 XP-2 equipment: Rotary head with 263 kNm max torque and up 38 rpm rotation speed and the crowd cylinder 350 kN / 220 kN extraction / crowd force make the rig ideal for casing operations. Crowd winch version is available with up to 16 m stroke of rotary head and 420 kN extraction/crowd force; the crowd winch version allows rapid-cfa drillings up to 24 m depth.
A powerful 336 kW diesel engine complying with the latest EU STAGE V emission regulations or EU STAGE IIIA equivalent, drives all the working functions of the ~85 t rig.
The B250xp-2 is multifunction rig designed to drill Bored Piles diameter 2700 mm max up to 78 m drilling depth or up to 32 m CFA drilling depth and ø1200 mm diameter. The rig is ready for easy conversion in other piling modes as displacement piles, soil mixing as well as diaphragm wall equipment with heavy duty hydraulic suspended hydraulic grabs. The Casagrande B300 XP-2 equipment: Rotary head with 300 kNm max torque and the crowd cylinder 400 kN / 250 kN extraction / crowd force make the rig ideal for casing operations. Crowd winch version is available with up to 19 m stroke of rotary head and 535 kN extraction/crowd force and allows easy conversion in rapid-cfa drillings up to 27 m depth.
A powerful 400 kW diesel engine complying with the latest EU STAGE V emission regulations or EU STAGE IIIA equivalent, drives all the working functions of the ~100 t rig. The B300xp-2 is multifunction rig designed to drill Bored Piles diameter 3100 mm max up to 89 m drilling depth or up to 32 m CFA drilling depth and ø1200 mm diameter. The rig is ready for easy conversion in other piling modes as displacement piles, soilmixing as well as diaphragm wall equipment with heavy duty hydraulic suspended hydraulic grabs. The rigs have been designed to make rigging/derigging and transport operations easy and safe thanks to the remote control and modular design of the machine.
The cabin has been designed with improved ergonomics for comfort and soundproofing, both inside and outside. The fan speed is related to the oil temperature in the smart oil heat exchangers, thus reducing fuel consumption and the overall noise level of the cooling system.