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Novel variable stiffness composite pile, construction method of novel variable stiffness composite pile, and long spiral drilling machine adopted in construction method
The invention discloses a novel variable stiffness composite pile, and further discloses a construction method of the novel variable stiffness composite pile and a long spiral drilling machine adopted in the method. The novel variable stiffness composite pile comprises a replacement layer and a core pile, wherein the core pile is vertically arranged in the center of the replacement layer, and raw materials forming the replacement layer are in a superflow state when initially injected into a pile hole. The construction method of the novel variable stiffness composite pile comprises the following steps that (1) a drilling rod of the long spiral drilling machine drills to the designed pile base elevation, and a cement-soil slurry is prepared; (2) the drilling rod is lifted upwards in an anti-spiral manner while slurry jacking, during which different materials are pressed into to form function layers with different stiffness; and (3) the core pile is implanted into the cement-soil slurry in the pile hole from the center of a steel sleeve. The composite pile made by the construction method has the benefits that the bearing capacity is high; no waste slurry is discharged; no squeezing effect exists; the composite pile can be adapted to stiffness requirements of different soil properties and soil layers; and the purpose of saving the cost of the materials on the premise of no reduction in stiffness is realized.
Novel variable stiffness composite pile, construction method of novel variable stiffness composite pile, and long spiral drilling machine adopted in construction method
The invention discloses a novel variable stiffness composite pile, and further discloses a construction method of the novel variable stiffness composite pile and a long spiral drilling machine adopted in the method. The novel variable stiffness composite pile comprises a replacement layer and a core pile, wherein the core pile is vertically arranged in the center of the replacement layer, and raw materials forming the replacement layer are in a superflow state when initially injected into a pile hole. The construction method of the novel variable stiffness composite pile comprises the following steps that (1) a drilling rod of the long spiral drilling machine drills to the designed pile base elevation, and a cement-soil slurry is prepared; (2) the drilling rod is lifted upwards in an anti-spiral manner while slurry jacking, during which different materials are pressed into to form function layers with different stiffness; and (3) the core pile is implanted into the cement-soil slurry in the pile hole from the center of a steel sleeve. The composite pile made by the construction method has the benefits that the bearing capacity is high; no waste slurry is discharged; no squeezing effect exists; the composite pile can be adapted to stiffness requirements of different soil properties and soil layers; and the purpose of saving the cost of the materials on the premise of no reduction in stiffness is realized.
Novel variable stiffness composite pile, construction method of novel variable stiffness composite pile, and long spiral drilling machine adopted in construction method
SUN LEI (author) / SUN WEN (author) / LUO JIACHENG (author) / LU LIHAI (author) / LIN FUGUANG (author)
2015-09-23
Patent
Electronic Resource
English
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