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By

ANTHONY CYRIL .G

HARIRAM .B

SABARIMUTHU

MAGESH . H

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BOX JACKING

Box jacking is jacking a large precast reinforced

concrete box horizontally through the ground,

usually beneath a road or railroad that must not be

interrupted.

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CONCRETE STRUCTURE

JACKING PUMPS

LAUNCHING SLAB

EXCAVTING MACHINES

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CONCRETE STRUCTURE

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The box is built on a greased launch slab lined upexactly with its final location.

It is then pushed straight ahead, guided by curbs on

the left and right to slide straight off the launch slab.

A steel shield installed on the front cuts the hole with

minimal overcut.

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The major advantage of the process is its

essential simplicity.

No intermediate ground supports are needed.

The structure is built away from the roadway,in the clear, without the constraints of shoringand traffic controls.

During the construction, traffic is proceedingoverhead normally, unaware of the

construction below.

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