Chapter: Civil : Construction Techniques Equipment Practices : Sub Structure Construction

Types of structures under jacking

Box jacking, Arch jacking, Pipe jacking.

Types of structures under jacking

Box jacking

Arch jacking

Pipe jacking

OPERATONS

The box shaped tunnel structures are pre fabricated units which are pushed into soil by hydraulic jack

Soil is excavated at the advancing face by manual means or by excavators

To avoid settlements of over laying roads or rail track soil is excavated after it enters the cutting heads

Excavation ahead of the cutting is avoided the cutting head is moved forward in small increments to avoid any having of the road or rail track

In addition to that, without stabilizing the soil, the box technique would cause the super structure to settle the threatening structure failure so the ground ahead of tunnel boxes needed to be frozen

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Civil : Construction Techniques Equipment Practices : Sub Structure Construction : Types of structures under jacking |