Table of Contents
What is Weisbach triangle method?
The weisbach method of correlation is usually preferred when only one shaft is available. The method consists of suspending two plumb wises which form a plumb plane and azimuth of the same is determined at the surface and taken U/G at the shaft inset and thereafter transferred to the U/G base or reference line.
How do you do a tunnel survey?
The basic procedure of tunnel surveying is to align the center line in the ground and transfer that to the tunnel. This also involves leveling the surface on the ground and the internal of the tunnel.
Which equipment is used for making the alignment of tunnels?
Gyro-theodolites were used during the construction of the Channel Tunnel to align the two tunnels as they were constructed from both France and the UK. A tachymeter (or tacheometer) is a type of theodolite used for rapid measurements.
How do you set up a tunnel?
SETTING OUT A TUNNEL Tunnel surveying consists of two surveys surface survey and underground survey, surface survey done in the usual way. As the terrain near the tunnel is likely to be mountainous and difficult, careful surveying required to get the proper alignment of the tunnel.
Which method is used for tunneling in soft rock?
Forepoling is an old method of tunnelling through soft ground. In this method, a frame is prepared in the shape of the letter A, placed near the face of the tunnel, and covered with suitable planks. Poles are then inserted at the top of the frame up to a viable depth.
Which method is used for tunneling in hard rock Mcq?
Explanation: Blasting is the conventional method which is adopted in case of rock tunneling. In the case of fire-setting, tunnel is heated with fire and then cooled with water.
How are underground tunnels made?
To use this method, builders dig a trench in the riverbed or ocean floor. They then sink pre-made steel or concrete tubes in the trench. After the tubes are covered with a thick layer of rock, workers connect the sections of tubes and pump out any remaining water.
Which method is used for laying underground sewers?
Case Method
Case Method: Mainly used for laying underground sewers.
What is method of tunneling in hard ground?
The various stages in the construction of tunnel are: Loading holes and firing the explosives. Ventilation and removing dust. Mucking. Removing ground water.
How do tunnels work?
Tunneling works by encapsulating packets: wrapping packets inside of other packets. Tunneling is often used in virtual private networks (VPNs). It can also set up efficient and secure connections between networks, enable the usage of unsupported network protocols, and in some cases allow users to bypass firewalls.