Box pushing technic

1. BOXPUSHINGTECHNIQUE

2. INTRODUCTION
• Due to increase in train speed &Non
observance of rules by road users, these are
more critical
• Total no of accidents occurring on indian
railway showing a progressive declane.

3. NECCESSITY FOR CONSTRUCTION OF ROAD
UNDER BRIDGES
• The interface between rail and road traffic
has to be eliminated.
• It is the safest techno –socio-economic
solution to the existing problem at rail-road
interface.

4. METHODS OF ELIMINATION OF
LEVEL CROSSING

5. ROAD OVER BRIDGES
• A bridge is a span structure.
• Designs of bridges depending on the
i. function of the bridge.
ii. the nature of the terrain where the bridge is
constructed.
iii. Availability of material.

6. Section girder on Road Over Bridge

7. ROAD UNDER BRIDGES
• The movement of traffic in both
perpendicular directions which is above and
below is said to be road under bridge.

8. METHODS OF CONSTRUCTION
• Methods of Construction ROB and RUB Out
of the above three methods, Box pushing is
the latest and is widely used in our country.

9. PICTURE OF BOX PUSHING

10. CASTING OF RCC BOX SEGMENTS
• An intermediate cutting shield with MS plate is also required to be
provided depending upon site conditions, type of soil, size of box etc.

11. PUSHING OF BOX SEGMENTS

12. MATERIALS USED
• Thrust Bed
• Front Shield
• Rear Shield
• Drag sheets / Epoxy Coating
• Plumb BOB
• Piston
• Pockets
• Counter Box
• Biscate

13. • No Disruption to rail traffic
• Better quality control
• Economical
• Time to completion is less
ADVANTAGES

14. DISADVANTAGES
• Needs trained staff and skilled
supervision
• Imposition of caution order exists for a
longer period
• No scope of night working

15. PROBLEMS ENCOUNTERED
DURING BOX PUSHING
• Leaking of joints
• Occurrence of boulder layer
• Occurrence of hard rock
• Occurrence of collapse strata
• Unexpected floods during box pushing
• Disturbance in track alignment

16. CONCLUSION
• It requires close supervision and monitoring
• Track must be watched regularly to see signs of
heaving settlement misalignment etc.
• Work must be done under block protection
/caution order only.

17. ThankYOU