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The purpose of box pushing is to form a horizontal opening below the ground through the embankment by providing precast box units underground, without disturbing overhead amenities like traffic and various structures.
The method of box pushing broadly consists of construction of thrust bed, construction of precast RCC box segments over thrust bed, front cutting shield, intermediate jacking station and pushing operation of precast box units. The boxes are designed and constructed at the site itself.
The advantage of box pushing technique is no disruption in traffic movement, whether it be railways or roadways, and better quality control. The technique is also economical, time for completion is less, savings are realised in manpower & machinery and importantly, there is no involvement of cranes and heavy machinery.
BOX PUSHING
DIRECTIONAL DRILLING
Horizontal Directional Drilling (HDD) is a method of installing underground pipelines, cables and service conduit through trenchless methods. It involves the use of a directional drilling machine, and associated attachments, to accurately drill along the chosen bore path and back ream the required pipe.
The first stage consists of drilling a small diameter pilot hole. Drilling fluid is pumped through the drill pipe to the drill bit where high pressure jets and the bit will grind the soils ahead of the drill stem.
The second step is to pre-ream the pilot hole and enlarge it to a size sufficient to safely install the product lines. The final step is the pullback of the pipe within the pre-reamed hole.
SHEET PILING
Shoring is a positive ground support system that can be used when the location or depth of an excavation makes battering and/or benching impracticable. Shoring is the provision of support for excavated face(s) to prevent the movement of soil and therefore ground collapse.
It is a common method of ground support in trench excavation where unstable ground conditions, such as soft ground or ground liable to be wet during excavation such as sand, silt or soft moist clay are often encountered.
Sheet piles are used in earth retaining structures where a differential surface level is to be established. The sheet pile forms the vertical interface.
DEWATERING
Dewatering means “the separation of water from the soil:’ or perhaps “taking the water out of a particular construction problem completely. Many excavations are carried below groundwater level.
Techniques for dealing with the problems that result depend on the excavation dimensions, the soil type, and the groundwater control requirements, among other factors. Well point Dewatering systems enable the lowering of the groundwater table, which allows safe excavation below the normal water table. This method has been used for many years for a wide range of applications from small excavations through to major construction projects.
