Variable-diameter reinforcement cage structure for expanded bore pile and construction method for expanded bore pile

Abstract

The invention provides a variable-diameter reinforcement cage structure for an expanded bore pile and a construction method for the expanded bore pile. The variable-diameter reinforcement cage structure comprises a fixed annular reinforcement, a movable annular reinforcement and variable-diameter reinforcement sets; the fixed annular reinforcement is fixed to the outer side of a main body reinforcement cage; the movable annular reinforcement is connected to the fixed annular reinforcement through the multiple groups of variable-diameter reinforcement sets so that the movable annular reinforcement can move close to or move away from the fixed annular reinforcement; each group of variable-diameter reinforcement sets comprises first connection reinforcements and a second connection reinforcement; the first connection reinforcements and the second connection reinforcements are connected through first rotating pairs; the first connection reinforcements and the fixed annular reinforcement are connected through second rotating pairs; and the second connection reinforcements and the movable annular reinforcement are connected through third rotating pairs. The variable-diameter reinforcement cage structure for the expanded bore pile is arranged in the expanded bore pile, the expanded part is provided with the variable-diameter reinforcement cage, and therefore the anti-shear ability ofthe part can be improved, the anti-floating property, the pulling resistance and the bearing capacity of the expanded bore pile can also be improved, and the vertical displacement of the expanded borepile can be greatly limited.

Description

technical field [0001] The invention relates to the technical field of expanding bottom piles, in particular to a variable diameter steel cage structure for expanding bottom piles and a construction method for expanding bottom piles. Background technique [0002] Because the diameter of the bottom of the expanded bottom pile is larger than that of the upper pile body, the bearing capacity of the single pile is greatly improved compared with the bearing capacity of the straight pile with the same diameter of the pile body, so it is widely used in highways and civil buildings. However, the upper and lower diameters of the steel cage of the expanded bottom pile are the same, and the excess part of the expanded bottom is only poured with concrete, and no reinforcement is added. Under the vertical load, the shear force is the largest in this part, and the disadvantage of concrete is that the shear resistance is poor, so the shear failure is most likely to occur in this place, thu...

AI Technical Summary

Problems solved by technology

However, the upper and lower diameters of the reinforcement cage of the expanded bottom pile are the same, and the extra part of the expanded bottom is only poured with concrete, and no reinforcement is added. Under the action of vertical load, this part receives the largest shear force, and the disadvantage of concrete is its poor shear resistance, so shear failure is most likely to occur at this part, which affects the bearing capacity of the expanded bottom pile

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