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
Support for a portable electronic device
Network decoys
Method and system for selecting a target with respect to a behavior in a population of communicating entities
System and method for access of user accounts on remote servers
Heat transfer label for decorating a metal container
Antibodies to non-functional P2X.sub.7 receptor
Hierarchical binding and lookup of addresses in inter-process communications systems
  Randomly Featured Patents
Holdfast and support system for an elastic plastic container liner
Security device for business machines
Asynchronous semiconductor memory having address transition detector
Method and apparatus for applying glaze or other coatings to food products
Compound for rare-earth bonded magnet and bonded magnet using the compound
Semiconductor devices having group III-V compound layers
Dental implant formed of AL.sub.2 O.sub.3 -ceramic for fastening a superstructure
Switching circuit and multi-voltage level power supply unit employing the same
Disposable mask assembly with exhaust filter
Method for process-specific exchange of data between machines in a network