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Wang L.-M.,Suzhou NG Foundation Engineering Co. | Shi M.-S.,Suzhou NG Foundation Engineering Co. | Xu L.-Y.,Suzhou NG Foundation Engineering Co. | Wang Y.-B.,Suzhou NG Foundation Engineering Co. | Zhou J.-M.,Suzhou NG Foundation Engineering Co.
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering

A kind of retrievable enlarged-end anchor with looped string is introduced. After three steel-strings are locked in U-loop by using a certain hinged bearing plate separately, they are assembled into a cable. The enlarged-end hole is constructed by high-pressure jet water or serous-cement technology, then the cable is inserted into the enlarged-end underground hole through a steel-pipe with inside-diameter of 110 ~135 mm. The steel-strings are opened by itself, together with the hinged bearing plate. The water-cement mixture is replaced by grouting with cement. The steel-strings can be retrieved after the foundation-pit is backfilled. This technology can prevent the anchor from overstepping red line. Source

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