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
Electrical converter with variable capacitor
Interface circuit and interface system
Detecting mirrors on the web
Article based on a composition containing a crosslinked blend of elastomers
Integrated analyses of breast and colorectal cancers
Method and system for billing based on color component histograms
Architectural panel with natural fossil spade leaf embossed surface
  Randomly Featured Patents
Strainer for use in cleaning and sterilizing a plastic lens
Contacting method and apparatus in contact copying
Handle for a drill- and/or chisel hammer
Optical coupling device including lead frame having a convexity and method of manufacturing the device
Implantable electric lead
Automobile roof structure
Retractable staircase for a recreational vehicle
Phase-lock loop
Disc jockey video game and controller
Universal joint and progressive cavity transducer using the same