Claims
- 1. A drilling apparatus for producing a pile with ribs, the drilling apparatus comprising:
- a hollow shaft having a first and second ends, and a port proximate the first end;
- an auger bit attached at the first end of the shaft to rotate with the shaft;
- an excavation blade attached to rotate with the shaft, the excavation blade attached proximate the auger bit;
- a cutting blade attached to rotate with the shaft; and
- a shear blade having a first end and a second end, the shear blade mounted about the shaft at a fixed longitudinal position such that the shear blade can rotate about a longitudinal axis of the shaft independent of rotation of the shaft, the length of the shear blade being greater than the excavation blade such that the first and second ends of the shear blade extend radially outward from the shaft beyond the excavation blade, and the first and second ends of the shear blade are each positioned in a plane angled from a horizontal plane, the first and second ends of the shear blade being adjustable in position between a position parallel to the horizontal plane and a position perpendicular to the horizontal plane.
- 2. The drilling apparatus of claim 1, wherein the shear blade is mounted to the shaft at a position in between the excavation blade and cutting blade.
- 3. The drilling apparatus of claim 2, wherein the diameter of the column of soil loosened by the shear blade is greater than the diameter of the column of soil loosened by the cutting blades by zero to 1/10 of the diameter of the column of soil loosened by the cutting blades.
- 4. The drilling apparatus of claim 3, wherein the shear blade has an end shaped to have a substantially a pyramid shape.
- 5. The drilling apparatus of claim 3, wherein the shear blade has an end shaped to have a semi-circular shape and converging to a single edge on the outermost radial side.
- 6. The drilling apparatus of claim 2, wherein the shear blade has a length such that the shear blade rotates at a rate an order of magnitude slower than the rotation rate of the cutting and excavation blades.
- 7. The drilling apparatus of claim 2, wherein the shear blade comprises a plurality of arm members each having a generally rectangular shape with one end being semi-circular.
- 8. The drilling apparatus of claim 1, wherein the shear blade further comprises:
- a housing having a generally cylindrical shape with an inner diameter slightly greater that the outer diameter of the shaft;
- a first pair of blade members attached to the housing and extending radially outward in opposite directions; and
- a first and second supports mounted to the shaft, the first and second supports being circular bands with outer diameters greater than the inner diameter of the housing, the first and second supports mounted along the shaft on opposite sides of the housing to prevent the housing from moving along the longitudinal axis of the shaft.
- 9. The drilling apparatus of claim 8, wherein the housing further comprises:
- a first cylindrical half having ends and an inner side, a first flange and a first mounting block attached to opposite ends of the first cylindrical half and extending in opposite directions radially outward from the shaft, the inner side of the first cylindrical half having a toughened surface for resistance with rotation of the shaft; and
- a second cylindrical half having ends and an inner side, a second flange and a second mounting block attached to opposite ends of the second cylindrical half and extending in opposite directions radially outward from the shaft, the inner side of the second cylindrical half having a roughened surface for resistance with rotation of the shaft.
- 10. The drilling apparatus of claim 9, wherein the mounting blocks are sized with respect to the height of the blade members such that the blade members can be mounted to lie in planes with different angles with respect to a horizontal plane.
- 11. The drilling apparatus of claim 10, wherein the blade members are mounted to a respective mounting block by welding.
- 12. The drilling apparatus of claim 10, wherein the angle of the plane in which the cutting blade lies is adjustable with respect to a horizontal plane.
- 13. The drilling apparatus of claim 12, wherein the angle of the plane in which the shear blade lies with respect to a horizontal plane is such that the shear blade rotates at a rate an order of magnitude slower than the rotation rate of the cutting and excavation blades.
- 14. The drilling apparatus of claim 8, further comprising a second pair of blade members having a length different than the first pair of blade members, the second pair of blade members being alternatively mounted to the housing instead of the first pair of blade members.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of U.S. patent application, Ser. No. 08/115,228, filed Sep. 1, 1993, entitled "A Soil Solidification Apparatus With A Shear Blade Of Adjustable Length And Rotation Speed For Creating A Ribbed Soil-Cement Pile", now U.S. Pat. No. 5,411,353.
US Referenced Citations (5)
Foreign Referenced Citations (7)
Number |
Date |
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36592 |
Mar 1980 |
JPX |
521 |
Jan 1983 |
JPX |
154214 |
Sep 1984 |
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125017 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
115228 |
Sep 1993 |
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