Pre-stress post-grouting variable-cross-section hollow pipe pile and construction method thereof

Abstract

The invention discloses a pre-stress post-grouting variable-cross-section hollow pipe pile and a construction method thereof. The pipe pile is characterized in that the pipe pile is a variable-cross-section reinforced concrete pipe pile with a vertical through hole in the center; a steel bar cage of the reinforced concrete pipe pile is composed of eight steel bars and a plurality of stirrups, the eight reinforcing steel bars are vertically fixed in the stirrups which are vertically aligned and distributed, the eight steel bars are uniformly distributed along the peripheries of the stirrups, and the steel bars and the stirrups are fastened in concrete; two grouting pipes which are deep into the pile bottom are uniformly distributed in the concrete around the vertical through hole. The invention further discloses the construction method. The method is characterized in that small cracks which are perpendicular to a pile body and generated after pile sinking of the variable-cross-section pipe pile is stable are filled in a post-grouting mode. By means of the post-grouting technology achieved through the grouting pipes in the variable-cross-section hollow pipe pile, soil between piles can be fully reinforced, the friction force and the meshing force of the pile body are increased, and meanwhile, slurry which is subjected to post-injection and can be solidified can also block underground water, so that the durability of the pile body is enhanced.

Description

technical field [0001] The invention relates to the technical field of prestressed variable-section hollow pipe piles, in particular to the field of improvement of prestressed variable-section hollow pipe piles in the construction field. Background technique [0002] Prestressed reinforced concrete piles have high reliability and save materials, but because the straight section piles have a smooth surface and low soil friction, the bearing capacity of the pile tip is not easy to exert. Although there have been great changes and improvements in variable cross-section piles, due to the settlement of the pile body, the soil within a certain range around the pile body on the shrinking surface forms a void area, and the soil is loosened, so that the pile body of this section Moreover, the steel bars are in a state of stress, and the high concentration of chloride ions in the groundwater in some coastal and salt lake areas will accelerate the corrosion of the steel bars. The durab...

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Problems solved by technology

[0002] Prestressed reinforced concrete piles have high reliability and save materials, but because of the smooth surface of the straight-section pile, the friction of the soil is small, and the bearing capacity of the pile tip is not easy to exert

Although there have been great changes and improvements in variable cross-section piles, due to the settlement of the pile body, the soil within a certain range around the pile body on the shrinking surface forms a void area, and the soil is loosened, so that the pile body of this section Moreover, the steel bars are in a state of stress, and the high concentration of chloride ions in the groundwater in some coastal and salt lake areas will accelerate the corrosion of the steel bars. The durability of the prestressed variable-section reinforced concrete piles is not optimistic. Apps are also limited

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