A self-anchored steel strand pretensioned centrifugal concrete pile and its manufacturing method

Abstract

The invention relates to a self-anchored steel strand pretensioned centrifugal concrete pile. The self-anchored steel strand Pretensioned centrifugal concrete pile comprises a hollow concrete pile body and a steel reinforcement cage located in the concrete pile body, wherein the steel reinforcement cage comprises prestressed main reinforcements arranged in the axial direction, stirrups and end plates. The self-anchored steel strand Pretensioned centrifugal concrete pile is characterized in that the prestressed main reinforcements are steel strands, a plurality of through holes allowing the steel strands to pass through are formed on each end plate, the through holes correspond to the steel strands one to one so that the steel strands passing through the through holes of the end plates can be connected with an external steel strand locking structure, and a plurality of threaded connecting holes for connection with the steel strand locking structure are further formed on the end plates. In this way, the steel strands can be tensioned through the steel strand locking structure outside, and then centrifugal molding is carried out, after molding is finished, an anchor plate is unloaded, and finally, the steel strands exposed out of the end plates are cut off and ground; the finished centrifugal concrete pile has no anchor part projecting from the end plate, and the centrifugal concrete pile with the steel strands is practicable and feasible.

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 self-anchored steel strand pretensioned centrifugal concrete pile. 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 and production of ...

AI Technical Summary

Problems solved by technology

However, this patent application does not disclose how to specifically realize the connection and anchorage of steel strands and end plates and its specific production methods. For ordinary technicians in the field of pretensioned centrifugal concrete pile manufacturing, because of the large span of the industry, generally It is 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 and the attached drawings of the patent application, there are protruding anchors on the end face of the formed pile, which makes It is impossible to connect the piles, and the protruding anchors are easily 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. Appearance of Centrifugal Concrete Pile with Steel Strand as the Main Reinforcement without Building Practical Value

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