Resources Contact Us Home
Manufacturing method and device of hollow-typed reverse circulating piles

Image Number 10 for United States Patent #4842447.

The invention is related to a kind of fabrication method and device of hollow reverse circulation piles of which the central hollow portion is installed with a movable sand barrel between which and the surrounding reinforcing cage, positioning device for movable sand barrel is installed. For starting the work, grouting to scheduled height from bottom of pile bore is made first and then grouting between pile bore wall and outer wall of movable sand barrel is conducted. Meanwhile, sands are poured into movable sandbarrel. By virtue of sensors on the inner and outer walls of movable sand barrel, the pressure between concrete grout and sand will be kept in equilibrium to avoid reverse grouting due to opposite pressure. Then, the sand barrel is pulled up step by step so that the pile poured with sand at its central part is primarily completed. Water is finally poured into the central part and sand is suctioned out to complete the hollow-typed reverse circulation pile. Its distinctive features are simplified and quick work process at low cost with high commercial value.

  Recently Added Patents
Digital broadcast receiver and method for processing caption thereof
Subscribing to content
Delay interferometer using magneto-optic effect of a variable faraday rotator
Isothermal amplification of DNA
Portable gaming device and gaming system combining both physical and virtual play elements
Analog-to-digital converter with input voltage biasing DC level of resonant oscillator
Method and system for filtering noises in an image scanned by charged particles
  Randomly Featured Patents
Transportable weatherproof battery power supply and storage for electronic equipment
Safety pushpin
Method and system for transmitting flow control information
Post-tensioning anchors assembled in combination with a spacer strip
Air injection device
Level shift circuit
Non-aqueous electrolyte secondary battery and method of producing coating for negative electrode active material thereof
Chair attaching towel clip
Printhead having different center to center spacings between rows of nozzles
Security batteries for automotive vehicles