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
Electrode for a plasma torch
Method for generating multi-antenna signals
Identification wristband
Method for providing interactive site map
Inverter, NAND gate, and NOR gate
Segmentation of a product markup image based on color and color differences
Controller for flexible and extensible flow processing in software-defined networks
  Randomly Featured Patents
Delta sigma modulator
Card slot bezel
High resolution pipelined digital-to-analog converter
Clip for hanging Christmas lights
System and method for enabling ultra small aperture communication antenna using spectral replication and coherent frequency and phase combining
Software implemented method for automatically validating the correctness of parallel computer programs
Compression bandage
Motor vehicle collision sensing device
Fluid absorption mat
Side dressing shield