surrounding a drilling hole application_number US 44560303 A description according to the schematic representation of fig1 a structure to be anchored 1 rests on part of a ground 2 and is stabilized by a grout anchor designated as a whole with the reference numeral 3 in known manner this grout anchor for instance comprises anchor cables 4 consisting of strands having one end fixed in an anchor head 5 resting on the structure 1 the anchor cables 4 are arranged over a certain free length within a drilling hole 6 and are rigidly attached to a bulb shaped grout body 7 formed around the lower part of the drilling hole by injection of cement under high pressure into the surrounding ground fig1 only provides a schematic picture of an example of an anchor as the technology of anchorage as such is well known the present invention consists in using as an example a column drill with a drilling pipe 8 equipped with an injection tool 9 coupled to a drilling tool 12 according to fig2 with which in a first stage the hole 6 is pierced over a length corresponding to the desired free length and bond length which essentially is that of the bulb 7 of fig1 the drilling tool 12 is attached to the ends of the amchor cables 4 for instance by welds 17 or by mechanical means of fixation such as keys prior to the drilling operation the drilling tool 12 and the anchor cables 4 are slipped into the central channel 10 of an inner pipe 21 that is coaxial with the drilling pipe 8 the drilling pipe 8 has a length without partitions that is at least equivalent to the length of the anchor cables the drilling tool 12 is.