CRG piles (concrete reinforced grouting pile) are obtained an invention patent. The construction technological process and the construction are introduced; the difficulty and problems about clearing clay and rock sediment in drill hole

floating concrete reinforced pile and grouting during construction in granite bearing layer are discussed. The grouting materials of CRG piles are bored for samples; it is found that the grouting materials are weak bonding

the bonding strength is low

which resists advancing the strength of CRG piles. The static loading tests are analyzed in-situ; the lateral resistance of piles and bottom rock resistance are fully played; and the bearing capacity of single CRG pile is much higher than that of bored pile. A wealth of experience is accumulated for testing and application of CRG piles to granite bearing layer.