| 摘要 |
Injection tube and method for placing a ground anchor An injection bore anchor (1) intended for use with rock which has particularly low cohesive properties is characterised in that at least two injection valves (11) are arranged in the front region of the injection bore anchor (1), i.e. in the region adjacent to the bore-crown (8) and the said injection valves (11) function like non-return valves, by means of which it is possible for the grout suspension issuing from a longitudinal channel running through the injection bore anchor (1) to flow out but not the reverse. In order to place the injection bore anchor, the injection bore anchor (1) is initially used as a bore rod, wherein a flushing fluid is guided by way of the longitudinal channel and the said flushing fluid flows out by way of the bores in the region of the bore-crown (8). Subsequently, a grout suspension is introduced by way of the longitudinal channel into the bore hole for the purpose of filling the bore hole, wherein subsequently the residual grout suspension located within the channel is displaced as far as the region of the bore-crown (8) by means of a displacement body introduced into the channel. By way of a grout suspension being introduced again after the initial setting of the grout suspension in the bore hole and the said grout suspension now flowing out by way of the injection valves (11), exerting a cracking open effect on the grout located here and/or penetrating in the still existing cracks and gaps, the bore hole in the region of the bore hole bottom and the surrounding rock is expanded and thus the size of the region penetrated by the grout is considerably increased, as a result of which it is possible to secure reliably the position of the injection bore anchor (1) in the surrounding rock. (Fig. 1)
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