Building contiguous deep foundation ditch basis pile underpinning method

The present invention relates to Industrial and Civil Engineering foundation of civil work reinforcing technique field.Step one, investigation, design: existing building is investigated, according to building foundation size, buried depth, building foundation and deep foundation ditch distance, the deep foundation ditch degree of depth, type selecting is carried out to foundation underpinning stake, the length of required foundation underpinning stake is determined by bearing capacity calculation, foundation underpinning stake quantity, foundation underpinning stake exceedes the degree of depth at the bottom of deep foundation ditch, finally completes ring beam design; Step 2, the piling of limit, building foundation; Step 3, building foundation pile base underpinning construction.The present invention makes building foundation meet the requirement of bending resistance, Punching Shear, shearing resistance by pile foundation underpinning, natural ground carrying in building foundation is converted to pile foundation carrying, significantly reduce building foundation to the imposed load of deep foundation ditch, solve the sedimentation, the horizontal movement that close on deep foundation ditch building foundation, ensure factory building safety.