Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Apparatus for and a method of tunnelling










Image Number 3 for United States Patent #4084386.

A drive shield of a tunnelling apparatus has elongate drive members supported and guided for longitudinal movement in a manner known per se. The drive members are connected to rear members or tails forming a rear shield and fluid concrete is introduced into a reception space within the rear shield to create a permanent lining for the tunnel. The rear members are shaped or profiled to provide recesses which are closed-off over a certain zone with the aid of covers. Reinforcing bars or the like can be inserted into the recesses to become cast into the concrete lining and means for delimiting the front end of the concrete reception space, such as a ring component, engages on the covers which form a smooth continuous bearing surface therefor.








 
 
  Recently Added Patents
Modulators of cystic fibrosis transmembrane conductance regulator
Semiconductor device
Feature management of a communication device
Image capture system and method
Cooler
Electronic device and recording medium
Projection screen and projection system having the same
  Randomly Featured Patents
Thermal feedback systems and methods of using the same
Multi-sport shoe
Device and method for processing call-related events in mobile terminal
Insurance exchange
Synthesizing a voice by developing meter patterns in the direction of a time axis according to velocity and pitch of a voice
Internal-combustion engine having a pre-combustion chamber
Stretched polyethylene multilayer film
Control system for a hydraulic transmission to prevent vehicle creep
Resin container
Traffic shaping method and device