BORED PILE BEARING CAPACITY DETERMINING METHOD Russian patent published in 2009 - IPC E02D33/00 

FIELD: construction industry.

SUBSTANCE: bored pile bearing capacity determining method involves pre-construction of bored pile by means of rotational sinking into the soil of inventory casing pipe with the head that will be left in the soil; then, filling of inventory casing pipe with reinforcing bracing and concrete, and when the latter reaches design strength, static pressing load is applied to the pile, and its movement is measured. Before inventory casing pipe is filled with concrete, therein installed is a shell. Between shell bottom and head there arranged is a force sensor connected with recording equipment that is located on the soil surface. Force sensor is isolated from environment along the shell perimeter by means of a ring made from flexible material, which is also installed between head and shell bottom. Shell and force sensor are introduced in inventory casing pipe together with reinforcing bracing. Pile is tested by means of cyclic loadings after design strength is reached; besides force sensor readings are taken, for extracting some part of external load from force readings, which defines bearing capacity of bored pile, and for extracting variable and unstable part in the form of friction forces.

EFFECT: improving the accuracy of determining the bored pile bearing capacity.

2 cl, 7 dwg