Box Pushing Technique

Box Pushing Technique

Present day Intensity of Traffic, both Rail & Road is very heavy and cannot be disturbed for construction of under bridges or Canal Crossings, drainage etc. by conventional i.e. open cut system. The purpose of pushing of Box is to form a horizontal opening below ground or through embankments, without disturbing the overhead amenities, like traffic & structures.

Box Pushing is a construction technique where in R.C.C. Boxes are cast in segments outside and pushed below ground or through heavy embankments by Jacking. The required thrust is generated through thrust bed, as well line & level of precast boxes is also controlled. With  the  progress of jacking,  the  front  unit  with  shield  penetrates  into  the  earth and there after  excavation within the shield is done  either  manually  or  mechanically and  the  excavated  stuff  is  transported  outside the  working  area. After the first segment advances to the end of the thrust-bed, the second segment is brought in alignment of the front Box & intermediate jacking space is left between the two. The progress of pushing is kept continuous till total length is pushed.