| 摘要 |
An equipment for constructing micropiles in soil, including:
€¢ a drilling rod with a bit (6) which presents at least one nozzle (7) designed to direct a jet of fluid in front of the bit, and at least one nozzle (8) designed to direct a jet of fluid in a direction substantially orthogonal to the axis of the drilling rod;
€¢ means (11, 12) designed to pull a protective tube (10), not adhering to the rod, while the rod advances. The invention relates also to a method for the construction of active anchors in soil, which includes the following stages:
€¢ drilling is performed with a drilling rod fitted with means (7) designed to inject a high-pressure liquid in front of the bit (6) until the stable soil strata are reached;
€¢ drilling continues, and during this second stage, a high-pressure grout is also injected with one or more lateral nozzles (8), while the drilling rod rotates;
€¢ during the drilling stages, a protective tube (10) that does not adhere to the drilling rod is pulled, said tube being inserted as far as the area where the grout injection begins;
€¢ when the required depth has been reached, the proximal end of the drilling rod is anchored to a plate;
€¢ when the grout has been consolidated, traction is applied to the drilling rod if necessary, and the job is completed by injecting grout into said protective tube. |
