The invention relates to a
pile top crown beam structure of a high-strength prestress
pipe pile for supporting a foundation pit and a construction method thereof. The structure is characterized in that a crown beam is arranged at the tops of high-strength prestress
pipe piles, the length of the part, inserted into the crown beam, of each high-strength prestress
pipe pile is the same as the height of the crown beam, the height of the crown beam is not lower than 500mm, the width of the crown beam is 400mm more than the
diameter of each pipe pile, the two ends of the crown beam respectively extend by 200mm out of the edge of each pipe pile, longitudinal stress reinforced bars of the crown beam are arranged near the edges of the inner side and outer side of the foundation pit, web bars are attached with the edge of each pipe pile, a bidirectional two-leg hoop bar and two additional vertical pull bars are arranged between the crown beams of the two adjacent high-strength prestress pipe piles, the hoop bar is 50mm away from the edge of each pipe pile, and two independent bidirectional two-leg bars are arranged in the area, anchored into the crown beam, of each high-strength prestress pipe pile. The method comprises the following steps of excavating earth to the bottom of the
cushion layer of the crown beam, measuring and paying off,
casting the
cushion layer, binding the reinforced bars, supporting a formwork,
casting concrete, airing water and curing, removing the formwork, and excavating the earth of the lower layer.