Field hole-digging and pouring foundation pit concrete support pile structure and manufacturing method thereof

Abstract

The invention discloses a field hole-digging and pouring foundation pit concrete support pile structure and a manufacturing method thereof. The field hole-digging and pouring foundation pit concrete support pile structure comprises a plurality of concrete support piles with vertical non-prestressed reinforcing steel bars and a capping beam with reinforcing steel bars; the tops of the concrete support piles and the capping beam are anchored; the reinforcing steel bars, on the excavation side of a foundation pit, of the concrete support piles are the multiple post-tensioned prestressed reinforcing steel bars and the multiple non-prestressed reinforcing steel bars; each prestressed reinforcing steel bar is externally provided with a casing pipe; the tops of the prestressed reinforcing steel bars penetrate through the capping beam and protrude out of the top face of the capping beam; intervals allowing the prestressed reinforcing steel bars to vertically move are formed between the prestressed reinforcing steel bars and the capping beam; a prestressed reinforcing steel bar fixing device and a tensioning device are arranged on the top face of the capping beam; and the bottom ends of the prestressed reinforcing steel bars are connected with anchoring devices. The support pile structure enhances the flexural rigidity, flexural capacity and deformation resistance of a single pile and the overall structure of a concrete support pile.

Description

technical field [0001] The invention relates to the technical field of civil engineering construction, in particular to a concrete support pile structure for a foundation pit dug and poured on site and a manufacturing method thereof. Background technique [0002] The most commonly used in the foundation pit support structure is reinforced concrete support pile plus internal support structure, such as the concrete support pile structure of the foundation pit dug and poured on site, including multiple concrete supports with vertical non-prestressed steel bars The top of each concrete support pile is anchored with the top of the non-prestressed steel bar, so as to strengthen the interaction of forces between the concrete support piles. In the prior art, in addition to the concrete support piles of prefabricated components, the concrete support piles in the concrete support pile structure of the foundation pit excavated and poured on site only use vertical non-prestressed steel ...

AI Technical Summary

Problems solved by technology

[0005] After adopting the above structure, the present invention has the following advantages: since the reinforcing bars on the excavation side of each concrete support pile are a plurality of post-tensioned prestressed reinforcing bars and a plurality of non-prestressed reinforcing bars, that is, the reinforcing bars on this side adopt The mixed reinforcement of prestressed steel and non-prestressed steel not only overcomes the disadvantage of insufficient strength of the single concrete support pile before tensioning if all post-tensioned prestressed steel bars are used on this side, but also because the side is in the On the basis of retaining part of the non-prestressed reinforcement, the post-tensioned prestressed reinforcement is added. The strength of the prestressed reinforcement is generally more than twice the strength of the non-prestressed reinforcement. In addition, the stretched prestressed reinforcement on this side makes the support The concrete of the retaining pile is pre-compressed, which can reduce deformation and enhance the bending stiffness of each concrete retaining pile to deal with the compressive stress on the non-excavation side, that is, the compression area, and the tensile stress on the excavation side, that is, the tension area. And the bending bearing capacity and anti-deformation ability; and because the top of each post-tensioned prestressed steel bar penetrates the top of the top beam and protrudes from the top surface of the top beam, the top surface of the top beam is equipped with a prestressed reinforcement tensioning device, post-tensioning The bottom end of the prestressed steel bar is connected with an anchor device, and the prestressed steel bar after tension forms a solid whole with the concrete support pile and the top pressure beam, which strengthens the relationship between the concrete support pile and the concrete support pile. The interaction between the concrete support pile and the top pressure beam improves the overall bending stiffness, bending bearing capacity and deformation resistance of the concrete support pile structure, thereby effectively ensuring the construction progress and construction safety.

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