A method of manufacturing a pretensioned centrifugal concrete pile with steel strands

Abstract

The invention relates to a pretensioned centrifugal concrete pile with steel stranded wires. The pretensioned centrifugal concrete pile comprises a concrete pile body and a rebar cage, and the rebar cage comprises prestressed main rebars, stirrups and end plates. The pretensioned centrifugal concrete pile is characterized in that the prestressed main rebars are the steel stranded wires, multiple conical holes which gradually expand from inside to outside in pore diameter are formed in at least one end plate and correspond to the steel stranded wires one by one, multiple clamping pieces are placed in each conical hole, clamping teeth are arranged on the inner surface of each clamping piece, the clamping pieces are spliced to form clamping head components used for hooping the steel stranded wires, the outer peripheral face of each clamping head component forms a cone face matched with the corresponding conical hole, the center of each clamping head component forms an inner tooth hole, and each steel stranded wire penetrates the inner tooth hole in the corresponding clamping head component and is locked by the inner tooth hole. The pretensioned centrifugal concrete pile is practical. The invention further relates to a manufacturing method of the pretensioned centrifugal concrete pile.

Description

technical field [0001] The invention belongs to the technical field of pile foundation engineering of various building structure systems, and in particular relates to a method for manufacturing a pretensioned centrifugal concrete pile with steel strands. Background technique [0002] All kinds of building structures generally involve pile foundation engineering. There are many products used in pile foundation engineering in the existing market, such as bored piles and prestressed centrifugal concrete pipe piles (including pipe piles and square piles). Under the current level of economic development and construction technology conditions, the field of architectural design has entered a new stage of development, and the requirements for pile foundations are also constantly improving. The technical performance of existing products can no longer meet the needs of the rapidly developing construction market. Highlights a number of serious technical flaws. [0003] The development...

AI Technical Summary

Problems solved by technology

However, the patent application does not disclose how to realize the connection and anchorage of the steel strand and the end plate in the pretensioned centrifugal concrete pile and its specific production method. For ordinary technicians in the field of concrete pile manufacturing, because the industry span , and it is generally impossible to know how to apply steel strands to the production of pre-tensioned centrifugal concrete piles; in addition, according to the technical solution described by it and the attached drawings of the patent application, there are protruding anchors on the end surface of the formed pile The protruding anchors are easy to be broken during the pile driving process, which will destroy the prestress of the pile body and reduce its technical performance such as bending resistance and shear resistance.

Therefore, it cannot be produced according to the technical solution disclosed by it, and even if it is produced, it cannot be applied to pile foundation engineering at all. This patent only theoretically proposes a general technical conception of applying steel strands to pretensioned centrifugal concrete piles , but cannot be applied in actual production and construction

[0007] It can be seen from the above that the prestressed centrifugal concrete piles and bored piles with steel rods as the main reinforcement widely used in the market can no longer meet the needs of the current pile foundation engineering, and the pretensioning method using steel strands as the main reinforcement can no longer meet the needs of the current pile foundation engineering. Centrifugal concrete piles are only a technical idea at present. Since the steel strands are twisted by multiple steel wires, they are not easy to be welded or entangled. Therefore, how to connect and fix steel strands in pretensioned centrifugal concrete piles and how to stretch steel strands is the key to realize the manufacture of pretensioned centrifugal concrete piles with steel strands. There is no centrifugal concrete pile with steel strand as the main reinforcement that has practical architectural value

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