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

Abstract

The invention relates to a pre-tensioning method centrifugal concrete pile with steel strands. The pre-tensioning method centrifugal concrete pile comprises a hollow concrete pile body, end plates and a steel bar cage. The steel bar cage comprises main prestressing bars and stirrups, wherein the main prestressing bars are axially arranged, and the stirrups are wound around the main bars. The pre-tensioning method centrifugal concrete pile is characterized in that the main prestressing bars are the steel strands, the steel strands of at least one end of the steel bar cage are combined with extrusion anchor devices, the peripheries of the extrusion anchor devices are sleeved with connecting sleeves, the connecting sleeves are provided with stepped through holes, the connecting sleeves are provided with threads for connection, a plurality of connecting counter holes are formed in the end plates, a threaded connecting piece is arranged inside each connecting counter hole, the end plates are connected with the threads for connection on the connecting sleeves through the threaded connecting pieces, and the end plates are further provided with a plurality of threaded connecting holes used for connection. According to the pre-tensioning method centrifugal concrete pile with the steel strands, in the pile manufacturing process, the steel strands combined with the extrusion anchor devices can be fixedly connected with the end plates through the connecting sleeves, tensioning plates of the end plates are fixedly connected in a threaded mode, the steel strands used as the main bars in the steel bar cage are tensioned and applied, and the anti-bending, anti-shearing and anti-tensioning performance is greatly improved. The invention further relates to a manufacturing method of the pre-tensioning method 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 bars as the main reinforcement used in large quantities on 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 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 and entangled. How to connect and fix the steel strands and how to stretch the steel strands is the key to realize the manufacture of pretensioned centrifugal concrete piles with steel strands, but up to now, there is no main reinforcement with architectural practical value at home and abroad Emergence of centrifugal concrete piles for steel strands

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