| 摘要 |
The invention provides a grout pack restraining system which includes a plurality of elongate elements shaped to extend about a grout pack and which are characterised in that they are configured to control circumferential expansi on of the grout pack beyond the expansion permitted through material yield of the elements. In one embodiment the rings of different diameter are secured abou t the grout pack. In a further embodiment rings which are configured to be circumferentially expandable are secured about the grout pack.
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