| 摘要 |
A grout pack [1] restraining envelope is provided which includes a plurality of restraining rings [7, 8] shaped to extend circumferentially around a grout bag [2] in a vertically spaced arrangement up at least a part of the height of the grout bag to provide support against lateral deformation of an installed grout pack as it occurs under axial load. At least some of the restraining rings are of differing tensile strengths or are configured to yield at differing tensions. The grout pack may have a collapsible polymer or wire mesh [3] positioned on the inside of the restraining rings to which at least some of the restraining rings are fastened. Restraining rings [7] of relatively higher tensile strength are provided at vertical positions at which relatively greater lateral deformation of the grout bag is expected, and rings [8] of relatively lower tensile strength are provided at vertical positions at which relatively less lateral deformation of the grout bag is expected. The restraining rings may be of the yielding or non-yielding type. |
