Rock anchor

Claim 2

An anchor assembly to be embedded and fixed in anchoring material such as rock or alluvium, the anchor assembly comprising in combination, an elongated tubular sealing jacket sealed closed at one end, a stressing cable axially received in and enclosed by said sealing jacket substantially throughout the entire length of the cable, said sealing jacket haVing a plurality of projections on both its external and internal surfaces over at least a first longitudinal portion thereof starting adjacent the sealed end of the jacket and extending towards the other end of the jacket, a hard cast material filling all the space between said cable and said jacket throughout said first portion of the jacket for transmitting forces from said cable to said jacket when the assembly is placed into use, said tube with the cable cast therein adapted to be inserted in a bore in the anchoring material such as rock or alluvium and secured therein by introducing settable cement material in the space between the jacket and the bore and between the remaining space between the cable and the jacket to close the other end of the jacket and permanently seal the cable in the jacket for transmitting forces from the cable to the anchoring material.

Claim 3

The anchor assembly defined in claim 1 wherein said jacket is a corrugated tube.

Claim 4

The anchor defined in claim 2 wherein said jacket is made from hard PVC.

Claim 5

The anchor defined in claim 1 wherein the projections radially extend approximately 5 mm. from the body of the jacket.

Claim 6

The anchor defined in claim 4 wherein the jacket has a thickness of approximately 1 mm.

Claim 7

An anchor assembly embedded and fixed in anchoring material such as rock or alluvium having an elongated bore, the assembly comprising in combination, an elongated tubular sealing jacket sealed closed at one end, a tension-stressing cable axially received in and enclosed by said sealing jacket substantially throughout the entire length of the cable, said sealing jacket having a plurality of projections on both its external and internal surfaces over at least a first longitudinal portion thereof starting adjacent said sealed end of the jacket and extending towards the other end of the jacket, a hard cast material filling all the space between said cable and said jacket including the spaces between said internal projections throughout said first portion of the jacket for transmitting forces from said cable to said jacket, said tube with the cable cast therein being inserted axially in said bore in the anchoring material, and hard cast material filling the space between the jacket and said bore and the remaining space between the cable and the jacket closing the other end of the jacket to permanently seal the cable in the jacket and to permit tension forces on the cable to be transmitted from the cable to said jacket first through said hard cast material in the jacket and then to said anchoring material through the hard cast material between the jacket and the anchoring material.

Claim 8

An anchor assembly embedded and fixed in anchoring material such as rock or alluvium having an elongated bore, the assembly comprising in combination, an elongated tubular sealing jacket sealed closed at one end, a tension-stressing cable axially received in and enclosed by said sealing jacket substantially throughout the entire length of the cable, said sealing jacket having a plurality of projections on both its external and internal surfaces over at least a first longitudinal portion thereof starting adjacent said sealed end of the jacket and extending towards the other end of the jacket, a hard cast material filling all the space between said cable and said jacket including the spaces between said internal projections throughout said first portion of the jacket for transmitting forces from said cable to said jacket, said tube with the cable cast therein being inserted axially in said bore in the anchoring material, and hard cast material filling the space between the jacket and said bore and the remaining space between the cable and the jacket closing the other end of the jacket to permanently seal the cable in the jacket and to permit tension forces on the cable to be transmitted from the cable to said jacket first through said hard cast material in the jacket and then to said anchoring material through the hard cast material between the jacket and the anchoring material.

Claim 9

The assembly defined in claim 6 wherein said jacket is a corrugated tube.

Claim 10

The assembly defined in claim 7 wherein said tube is made from hard PVC.

Claim 11

The assembly defined in claim 7 wherein said tube is made from stainless steel.

Claim 12

The assembly defined in claim 6 further including a spanning head located at and closing the other end of said jacket with the cable anchored to said spanning head, said spanning head abutting against a surface of an object which is anchored to said anchoring material by said assembly.

Claim 15

The method defined in claim 11 further including the steps of attaching a spanning head to the end of the cable and then introducing settable material iNto the remaining space between the cable and the jacket to fill the same.

Claim 16

The method defined in claim 11 wherein said cable is assembled in said jacket by introducing said settable material in said forward section before insertion of the jacket into the passage of the rock.

Claim 17

The method defined in claim 13 wherein the cable is assembled in said jacket with the settable material inserted in said forward section at a site remote from the anchoring site and then the cable assembled in the jacket is transported to the anchoring site for insertion into the passage of the rock.

Claim 18

The method defined in claim 13 wherein after the settable material is introduced between the jacket and the rock wall defining the passage, a spanning head is secured to the end of the cable and the settable material is introduced into the remaining space between the cable and the jacket.

Claim 19

The method defined in claim 11 wherein said projections are formed by roughening the surface of said jacket prior to insertion of said cable.