A pretensioned centrifugal concrete pile with steel strands and its manufacturing method

Abstract

The invention relates to a pretensioned centrifugal concrete pile with steel stranded wires. The pretensioned centrifugal concrete pile comprises a concrete pile body (1) and a rebar cage positioned in the concrete pile body (1), and the rebar cage comprises axially-arranged prestressed main rebars and stirrups (4) wound outside the main rebar. The pretensioned centrifugal concrete pile is characterized in that the prestressed main rebars are the steel stranded wires (3), the steel stranded wires (3) at at least one end of the rebar cage are combined with squeezing-type anchors (5) by means of squeezing, the outer end faces of the squeezing-type anchors (5) are flush with or slightly lower than that of the concrete pile body (1), and a thread for connection is arranged on each squeezing-type anchor (5). In the process of manufacturing of the pile body, the squeezing-type anchors and a tensioning plate can be fixed together through threaded connection to realize tensioning and applying of the steel stranded wires as the main rebars in the rebar cage, and bending resistance, shearing resistance and tensioning resistance of the pretensioned centrifugal concrete pile are greatly improved; end plates can be freely mounted according to actual needs. The invention further relates to a manufacturing method of the 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 pretensioned centrifugal concrete pile with steel strands and a manufacturing method thereof. 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 dev...

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. There is no centrifugal concrete pile with steel strand as the main reinforcement that has practical architectural value

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