发明授权
US5219247A Method of forming consolidating earth columns by injection, the relevant plant with double chamber pneumatic hammer boring drill and the resulting column 失效
通过注射成型固结土柱的方法,相关工厂采用双室气动锤钻镗柱和所得柱

Method of forming consolidating earth columns by injection, the relevant
plant with double chamber pneumatic hammer boring drill and the
resulting column
摘要:
A method apparatus, and product of forming consolidated earth columns of cement grout or mortar to be used, for instance, in building foundations. The method is designed to drastically reduce the time taken to form consolidation columns and to allow consolidation of earth particularly difficult to bore. The method consists of injecting the consolidating grout during the ascent of the drilling tool from the earth supplying air, at the same time, to the pneumatic percussion tool used to make the preliminary drilling.The plant to put the method into effect comprises a rotating joint manifold (6) at the upper end of the boring drill (11), equipped with tangentially arranged inlets, even inclined; an air manifold (15) to supply compressed air to the pneumatic percussion tool through the external annular chamber (28) of said boring drill (11); a grout distributor (36) equipped with ejection nozzles (38) the axes of which are inclined with respect to the axis of the drill. The column (46) is cylindrical in shape, with transversal projections (47).
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