Pile top crown beam structure of high-strength prestress pipe pile for supporting foundation pit and construction method thereof

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of deep foundation pit support engineering, in particular to a pile top crown beam structure and a construction method of high-strength prestressed pipe piles used for foundation pit support. Background technique [0002] As the urban land becomes more and more tense, in order to make full use of the existing land, the distance between the basement and the red line of the planned land is getting closer and closer, and the distance between some basements and the red line of the planned land is even less than 3m. Yes: a common foundation pit with a depth of 3~4m is restricted by the red line of the site, so simple support methods such as natural grading cannot be used, but vertical support structures must be used. At this time, high-strength prestressed pipe piles are used as a low-cost The supporting structure has wide application prospects. In order to make all the supporting pipe piles form a whole and pla...

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Problems solved by technology

[0004] Aiming at the current situation that the traditional method of high-strength prestressed pipe pile top crown beam will cause too much waste of reinforced concrete due to excessive anchoring into the hollow hole of the pipe pile and the crown beam is easy to be pulled out when the horizontal displacement of the pile top is uncoordinated. The present invention p

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