Resources Contact Us Home
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
Semiconductor device
Charged-particle beam lens
Peer-to-peer, internet protocol telephone system with proxy interface for configuration data
Method and structure for image local contrast enhancement
Message transfer apparatus, output method, and computer program product
Downlink scheduling in fractional frequency reuse (FFR) systems
Storage system comprising multiple microprocessors and method for sharing processing in this storage system
  Randomly Featured Patents
Zeolite SSZ-13 and its method of preparation
Packaged snack-food and carton
Method of controlling read write operation of a magnetic disk apparatus
Control of an electric machine
Electronic printing system for printing multiple images with determination of the maximum number of reduced size images to be optimally printed on a sheet of detected size without interference
Method of facilitating reliable access of flash memory
Very small pixel pitch focal plane array and method for manufacturing thereof
Link load balancer that controls a path for a client to connect to a resource
Systems and methods for electrosurgery