Claims
- 1. A method of casting and forming concrete spirally in a continuous band, comprising feeding concrete mix into a slip form which is closed at its front, top, and sides but is open at its rear and bottom; and applying pressure to the said closed front of the slip form through the intermediacy of the fed concrete, so as to advance the slip form spirally solely by reason of said pressure, while constraining said slip form to rotate about a fixed center.
- 2. The method of claim 1, wherein a continuous length of reinforcing material is fed under constraint into the unset concrete mix; and the pressure applied is sufficient to both advance the slip form and to tension said reinforcing material.
- 3. A method of casting and forming concrete spirally in a continuous band, comprising feeding wet concrete into a slip form closed at its front, top, and sides but open at its rear and bottom and advancing the slip form spirally solely by reason of the said feeding, while constraining it to rotate about a fixed center.
- 4. The method of claim 3, wherein reinforcing elements are fed under constraint into the wet concrete and the feeding of the wet concrete is under pressure sufficient to both advance the slip form and tension said reinforcing elements.
- 5. The method of claim 4, wherein the reinforcing elements are supplied by one or more continuous lengths of reinforcing cables wound on and fed from respective drums; wherein multiple lengths of cable are fed from the respective drums simultaneously and are twisted together to provide a single reinforcing cables; and wherein the single reinforcing cable is frictionally constrained to impart a desired degree of tension thereto as it is being fed into the wet concrete or the like.
- 6. The method of claim 5, wherein frictional constraint of the single reinforcing cable is accomplished by feeding said cable through a clamping device and winding it about a stationary friction post before it is fed into the wet concrete or the like, and controlling the clamping device in accordance with desired cable tension.
- 7. The method of claim 4, wherein the reinforcing elements are supplied by a continuous length of reinforcing material wound on and fed from a drum, and the feeding constraint is applied by braking the drum during the feeding to impart a desired magnitude of tension to the reinforcing material as it is fed into the wet concrete or the like.
- 8. The method of claim 3, wherein upward thrust on the slip form by pressure in the pressure chamber is counteracted by the placement of weights on said slip form.
- 9. The method of claim 3, wherein one or more continuous grooves are formed in the top of the continuous band during the casting thereof, and the reinforcing elements are placed in respective grooves.
- 10. The method of claim 3, wherein earth is excavated from under the slip form as the wall construction progresses downwardly.
- 11. The method of claim 3, wherein the slip form is carried by one end of a boom whose other end is mounted for rotation on the fixed center, and wherein the said fixed center is mounted on a continuously or intermittently laterally movable frame such that the spiralling slip form will generate other than a circle in horizontal section.
- 12. The method of claim 3, wherein the slip form is carried by one end of a boom whose other end is mounted for rotation on the fixed center, and wherein the fixed center is continuously or intermittently moved vertically such that the configuration of the generated structure in vertical section does not have a fixed center.
- 13. The method of claim 12, wherein the length of the boom is continuously or intermittently changed such that the configuration of the generated structure will be other than a true radius in vertical section.
RELATED APPLICATION
The present application is a division of my allowed, copending application Ser. No. 855,167, filed Nov. 28, 1977 now U.S. Pat. No. 4,193,750, Mar. 18, 1980, and entitled "Self-Propelled Slip Form Machine and Method."
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
Country |
Parent |
855167 |
Nov 1977 |
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