METHOD FOR BUILDING CAST-IN-PLACE PILES AND FORTIFYING THEIR BASES Russian patent published in 1999 - IPC

FIELD: construction engineering. SUBSTANCE: method can be used in building of crushed-stone and sand-filled cast-in-place piles and in fortifying their bases. According to method, building of cast-in-place piles and fortifying their bases includes drilling of bore-holes, filling of bore-hole with crushed-stone and/or sand, vibrating compaction of material. Portion of material is poured to bottom of bore-hole. Lowered into bore-hole is vibrating compactor. Compaction of crushed-stone and/or sand is effected over entire height and area of material at operation of low frequency equal to 6-15 Hz and high amplitude equal to 3-20 mm. Vibrating compactor is removed from bore-hole at high frequency equal to 20-45 Hz and low amplitude equal to 0.3-1.5 mm. In operation with unstable ground, before filling bore-hole with loose material, casing pipe is sunk into bore-hole, and after filling bore-hole with loose material, casing pipe is partly lifted with subsequent compaction of material into ground below base of casing pipe. After that, casing pipe is again sunk. Upon that, vibrating compactor is removed from bore-hole at high vibration frequency equal to 20-45 Hz and low amplitude of 0.3-1.5 mm. Framework is now lowered into bore-hole and concreting is carried out. Aforesaid method allows for doing away with using non-mobile and operationally expensive pile-driving plants, diesel-hammers, and compactors. Load-bearing capacity of cast-in-place piles is also increased. EFFECT: higher efficiency. 2 cl, 10 dwg