Box Pushing Technique

The precast reinforced concrete box is built away from the road, without the constraints of shoring and traffic controls.

Then the structure is fitted with a shield 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 actual jacking takes only a few days to a week. During that time, traffic proceeds overhead normally, unaware of the construction below or sometimes with speed restrictions.

Disclaimer : Photos are from the internet.

Advantages :

• Uninterrupted and Continuous movement of the rail traffic as well as road traffic

• Elimination of level crossings

• Construction of ROBs are expensive.

Structural components :

1. Precast R.C.C. Box

2. Thrust bed

3. Front Cutting Shield

4. Rear Jacking Shield