施工工艺大全套管成孔灌注桩施工（Construction technology Daquan, casing hole filling pile construction）.doc

施工工艺大全套管成孔灌注桩施工（Construction technology Daquan, casing hole filling pile construction） Construction of cast-in-place pile with casing hole Casing bored pile with hammer pile machine or vibration pile machine with valve pile tip or reinforced concrete precast pile tip (boots) steel hammer or vibration into the soil, then pouring concrete, while the volume field machine extubation or edge vibration PIPE-DRAWING pile. The technology is characterized in that: it is adaptable to complex formation, can play a larger small pile pipe section pile, bearing capacity; a casing, can avoid hole collapse, bottleneck, pull off, shift, void defects, quality and reliable; can sink can pull, fast construction speed, high efficiency, simple operation and safety. The process standard is applicable to industrial and civil construction, and the foundation soil is generally cohesive soil, silt and mucky soil. The bored sand and miscellaneous fill soil layer is made of bored pile with casing tube. The first chapter: material requirements 1. cement With 425 ordinary cement, slag cement or volcanic ash cement, requiring fresh, no caking. 2. stones Gravel diameter is not greater than 50mm; gravel particle size is not greater than 40mm; reinforced piles, gravel particle size should not be greater than 30mm, and should not be greater than the minimum steel clearance of 1 / 3. 3. reinforcement The varieties and specifications shall be adopted according to the design requirements, and the factory certificate shall be issued. The second chapter mainly implements equipment 1. hammer pile driving equipment For general hammer piling machine, such as drop hammer, diesel hammer, steam hammer, etc., by pile frame, pile hammer, pile pipe, etc., pile diameter is 270 ~ 370mm, length 8 ~ 15m. 2. vibratory pile driving equipment Including DZ60 or DZ90 type DJB25 type walking type vibration hammer, Lycra, hoist, pressure device, pipe pile and pile toe or reinforced concrete precast pile boots. The diameter of