The Main Working Principles Of Giant Tunneling Machines TBM (2017)
Our ideal conditions for this special machine technology to achieve high advanced rates. The cutter head with its cutting tools designed specifically for the geology ensures an accurate excavation profile initial measure to secure the rock are taken directly behind the cutter head.
What is Gripper TBM?
The named gripper TBM is derived form the laterally extendable gripper shoes before each stroke the machine is braced against a previously excavated tunnel wall.
Using these laterally extendable hydraulic thrust cylinders in the backup area the excavated tunnel diameter is permanently supported with rock bolts and concrete.
If necessary in addition further supply facilities are installed. Haren connect tripper TBMs are customized to each project with boring diameters from 2 to over 12 meters.
The machine shown below has a diameter of 8.5 meters and a length of 190 meters to the end of the backups system. With a driving power of 42,00 Kilowatts.
Working Method With Cylinders of TBM:
The Thrust cylinders push the rotating head forward, it’s equipped with 58 cutting tools. The disc cutters they are pressed against the tunnel face with a pressure of up to 32 tons per disk.
They are roiling movements break single pieces so-called chips out of the rock. Water jets installed on the cutter-head minimize dust formation and cool down the cutting tools optionally ingratiated sensor system ensure early wear detection this facilities the planning of efficient maintenance intervals for the tool change.
Technical Support and Refurbishment:
Paired connect offers in house manufactured long lasting disc cutters as well as customized technical support for refurbishment.
On site buckets installed at the cutter-head to take up the excavated material due to the rotation of the cutter heat the material slide to the center of the machine.
The integrated mug shoots there it falls through the funnel shaped much ring into the machine belt running to the rear further belt conveyors of transport vehicles then remove the rock chips form the tunnel.
Before each stone the machine is braced against the tunnel wall with the gripper shoes. The contract pressure is provided by the laterally extendable hydraulic cylinders, the two cylinders fixed to the gripper unit push the cutter head forward against the tunnel face.
Connection and Working of Shields in the TBM Tunnel Machine:
Several partial shields allow a flexible reaction to rock convergences they are telescopic and stabilized the TBM.
During the boring process prevent vibrations and thus reduce wear and tear a roof shield often equipped with a finger shield, extending backwards protects man and machine against Rockfall.
The weight of the tunnel boring machine rests on the invert shield, it slips directly over the tunnel floor and serves as a pivot points for steering.
After completion of a strike tunneling is interrupted, the machines supports is extended and the gripper unit is moved forward to the tunnel face. The gripper unit not only provide the pressure for the thrust it, also serves to steer the TBM.
Different Views and Fundamentals:
The View from above shows the main beam on a sliding bearing in the center of the machine moved vertically and horizontally using the hydraulic cylinders of appropriate cylinders.
The Cylinders opposite to each other, interact on the main beam with different degrees of pressure, and thus create the slowly moves.
Stations to the West and Canary Wharf for Tunneling with TBM in 2018:
When it opens in 2018 a company that works for tunneling, Will connect 28 existing stations to the West and the City and Canary Wharf. Through 21 Kilometers of new twin-bore tunnels under central London.
Eight tunnel boring machines, or TBMs, will drive through the ground to create tunnels.
A TBM is a 148 meters long and weights a thousand (1000) tonnes. This is the equivalent of 14 London buses end-to-end and a staggering 143 buses in weight. It has a rotating cutter-head at the front and a series of trailers behind housing all the mechanical and electrical equipment.
Types of TBM Machines:
There are two types of TBM being used by the Company, first one is “Earth Pressure Balance TBMs” and second is “Mix Shield TBMs”.
Six earth pressure balance TBMs will be used for the 18 Kilometers of Clay to the West and the riverbed deposits in the east, while 2 Mix-Shield machines will be used to drive the tunnels through the chalk under the river Thames.