Soil grouting apparatus

Claim 2

Apparatus for grouting the soil adjacent to a borehole comprising, means for forming a borehole having a borehole wall with a first diameter, tubular means in said first named means for conveying grout from a source outside the borehole to a delivery aperture in the tubular means and within the borehole, said aperture being spaced from the lower end of said tubular means, said tubular means having a diameter substantially less than said first diameter, separate upper and lowerr expansible sealing means affixed to said tubular means at positions above and below said delivery aperture, means for confining said sealing means when the apparatus is in borehole forming mode, means for moving said confining means vertically relative to the tubular means to release the sealing means, and means for causing said sealing means to close the space between said tubular means and said borehole wall above and below said delivery aperture, whereby a zone to be grouted is defined.

Claim 3

Apparatus according to claim 1 wherein each of said sealing means is an elongated cylindrical cuff having a closed end fixed on said tubular means and an open end extending toward and spaced from the open end of the other sealing means to define a space constituting a grouting zone.

Claim 4

Apparatus according to claim 2 wherein the cuff is of a resilient material inherently expandible into sealing contact with the borehole wall.

Claim 5

Apparatus according to claim 3 wherein the cuff is internally longitudinally ridged.

Claim 6

Apparatus according to claim 2 wherein the cuff includes a compressible spring biased to expand the cuff into sealing contact with the borehole wall.

Claim 7

Apparatus according to claim 1 wherein the borehole forming means is an auger having a hollow shaft, and the tubular means is a grout pipe traversing axially said hollow shaft and movable axially thereof.

Claim 8

Apparatus according to claim 1 wherein the borehole forming means is a drill having a drill steel and carrying a bit, and the tubular means is the axially bored drill steel.

Claim 9

Apparatus according to claim 7 in which the confining means is a tubular sleeve concentric with the drill steel, having a diameter intermediate between said first diameter and the diameter of the drill steel, and which includes means associated with the drill steel and said sleeve for positioning and guiding said sleeve.

Claim 10

Apparatus according to claim 8 wherein said positioning, guiding and moving means comprise cam elements.

Claim 11

Apparatus according to claim 7 which includes means for closing the lower end of the drill steel bore.

Claim 12

Apparatus for grouting the soil adjacent to a borehole comprising, an auger for forming a borehole having a borehole wall with a first diameter, the auger having a hollow shaft, a grout pipe traversing axially said hollow shaft for conveying grout from a source outside the borehole to a lateral delivery aperture in the grout pipe and within the borehole, said aperture being spaced from the lower end of said pipe, said pipe being movable axially in said shaft and having a diameter substantially less than said first diameter and being closed at its lower end, separate upper and lower sealing means affixed to said grout pipe at positions above and below said delivery aperture, means for holding said auger and said grout pipe together in borehole forming relation with the sealing means confined within the hollow shaft, means for holding said auger and grout pipe together in grouting relation with the sealing means removed from said shaft and free in the borehole, means for effecting relative movement of said auger and grout pipe from borehole forming relation to grouting relation, and means for causing said sealing means to close the space between said grout pipe and said borehole wall above and below said delivery aperture, whereby a zone to be grouted is defined between said sealing means.

Claim 13

Apparatus for grouting the soil adjacent to a borehole comprising, an auger for forming a borehole having a borehole wall with a first diameter, the auger having a hollow shaft, a grout pipe traversing axially said hollow shaft for conveying grout from a source outside the borehole to a lateral delivery aperture in the grout pipe and within the borehole, said aperture being spaced from the lower end of said pipe, said pipe being movable axially in said shaft and having a diameter substantially less than said first diameter and being closed at its lower end, separate upper and lower sealing means affixed to said grout pipe at positions above and below said delivery aperture, means for holding said auger and said grout pipe together in borehole forming relation with the sealing means confined within the hollow shaft, means for holding said auger and grout pipe together in grouting relation with the sealing means removed from said shaft and free in the borehole, means for effecting relative movement of said auger and grout pipe from borehole forming relation to grouting relation, and means for causing said sealing means to close the space between said grout pipe and said borehole wall above and below said delivery aperture, whereby a zone to be grouted is defined between said sealing means.

Claim 14

Apparatus according to claim 11 wherein the means for effecting relative movement includes a screw threaded engagement between the borehole forming means and the grouting means.