METHOD TO INCREASE BEARING CAPACITY OF BORED PILE Russian patent published in 2014 - IPC E02D27/12 

FIELD: construction.

SUBSTANCE: method to increase bearing capacity of bored piles consists in the fact that each bored pile is made of two elements; the lower part - from loose working substance (crushed stone, slag and similar material) interacting with a soil base, besides, the foot of the working substance lies deeper than the depth of soil freezing, the upper part of the pile is erected as solid, reinforced concrete with a cross-shaped head. The solid reinforced concrete grill is erected, and the whole structure is partially erected. Pairs of jacks-pulsators of double reciprocal action are mounted onto cross-shaped heads, their plungers are rested against the structure grill. Pairs of jacks-pulsators are connected by oil lines with a pulsating pump station. From the panel, jacks-pulsators are switched on, and pulses are applied to press the upper solid part of the pile deep down, using the foot of the solid pile, the working substance is pressed into loose soil base, the form of the working substance contact surface is transformed with the soil base into a drop-like, pear-like shape, pressed with the surface of the contact of the working substance of the weak soil base under it and around it, previously they stress, seal and strengthen these weak loose zones of the soil base, to the rated value of force. Using the manometers, they monitor pressure developed by a pair of jacks-pulsators, the bearing capacity of each pile is increased several times. Strength and deformability of the zone of contact of the soil base with the working substance is balanced. The bearing capacity of piles is balanced in respect to each other, and uneven subsidence is prevented, and the structure list is eliminated.

EFFECT: increased bearing capacity of bored piles during construction, elimination of uneven subsidence of separate piles and the whole structure.

1 ex, 4 dwg