Babaria Institute Of Technology, Vadodara.

ADVANCED CONSTUCTION EQUIPMENTS.

A Presentation on‘TBM – Tunnel Boring Machine’

By:-Milan Sheta(130050106109)

Vikram Sindhav(130050106111)

TBMTUNNEL BORING MACHINE

INTRODUCTION

1. A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.

2. A tunnel may be for road traffic, canal, hydroelectric station, sewer etc.

3. The Delaware Aqueduct in New York USA is the longest tunnel, of any type, in the world at 137 km (85 mi).

REQUIRMENTS OF TUNNEL

1. is very useful where bridge fail to fulfill requirements like in sea, in urban area, and in mountains.

2. Efficient compared to bridges.3. In war time it is much difficult to

destroy a tunnel but destruction of bridge is too easy.

4. Lots of land and time is saved.

TUNNEL BORING MACHINE

1. tunnel boring machine (TBM) is a machine used to excavate tunnelss with a circular cross section through a variety of soil and rock strata.

2. They can bore through anything from hard rock to sand.

3. Tunnel diameters can range from a metre to 19.25 metre.

DRILL AND BLAST1. Before the advent of tunnel boring machines, drilling

and blasting was the only economical way of excavating long tunnels through hard rock, where digging is not possible.

2. 2.Even today, the method is still used in the construction of tunnels

3. But the disadvantage is it disturbance the sorroundings

HOW DRILL AND BLAST IS BEING DONE

HISTORY

• The first successful tunnelling shield was developed by Sir Marc Isambard Brunel to excavate the Thames Tunnel in 1825.

• In the United States, the first boring machine to have been built was used in 1853 during the construction of the Hoosac Tunnel.

MAIN PARTS OF TBM

WORKING OF TBM

1. A TBM is shaped like a tube. At the front is a rotating disk with cutting teeth that can shear through rock

2. The pulverized rock falls to a conveyor belt that carries it to the back of the TBM

3. Hydraulic feet grip the sides of the tunnel and push the machine forward

4. There is also the ability to insert plates to line the interior of the tunnel

ADVANTAGE

1. Higher advance rates2. Continuous operations3. Less rock damage4. Less support requirements5. Uniform muck characteristics6. Greater worker safety7. Potential for remote, automated operation.

DISADVANTAGE

1. The major disadvantage is the upfront cost2. TBMs are expensive to construct, and can be

difficult to transport.3. TBM can not move in backward direction4. TBMs are expensive to construct, and can be

difficult to transport.

APPLICATION

1. 1.In road traffics2. 2.In sewers3. 3.In minings4. 4.In rail traffics5. 5.In hydroelectric stations

Thank You