| Popis: |
The analysis of Pre cast box is done by using STAAD Pro. And design of Thrust bed is done by Limit state method manually. Box pushing is pushing a large precast reinforced concrete box horizontally through the ground, usually beneath a road or railroad that must not be interrupted. The major advantage of the process is its essential simplicity. The structure is built away from the roadway, in the clear, without the constraints of shoring and traffic controls. When the structure is ready, a shield is fitted to the front, hydraulic jacks are installed behind, and the box is pushed into final position while simultaneously the earth is excavated from within. The pushing of box generally takes only a few days to a week. During that time, traffic is proceeding overhead normally, unaware of the construction below. The nondisruptive nature of the process together with its inherent safety, simplicity and economy make box pushing a useful tool for the practicing civil engineer. This paper intends to bring a greater familiarity with the box pushing process to the reader and then give some considerations and guidelines to assist engineers in designing a project that can be built using the box pushing method. Box pushing is a well- established means of engineering culverts or tunnels under rail embankments or waterways to accommodate road or rail traffic. |
