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 and a manufacturing method. The pre-tensioning method centrifugal concrete pile comprises a hollow concrete pile body, an end board and a steel reinforcement cage, wherein the steel reinforcement cage comprises prestress main ribs, stirrups and the end board, and the prestress main ribs are axially arranged, and the stirrups are wound on the main ribs. The pre-tensioning method centrifugal concrete pile is characterized in that the prestress main ribs are the steel strands, the steel strands on at least one end of the steel reinforcement cage are tightly combined with a squeezing anchor in a squeezed mode, the squeezing anchor is provided with connection threads, the end board is provided with a plurality of connection counter bored holes, a thread connection part is arranged in each connection counter bored hole, and the end board is connected with the connection threads on the squeezing anchor through the thread connection parts; the end board is further provided with a plurality of thread connection holes for connection. In a pile body manufacturing process, the squeezing anchor can be fixed to the end board, then the end board is fixedly connected to a tensioning board through the threads, so that the steel strands serving as the main ribs in the steel reinforcement cage are tensioned and applied, and bending resistance, shearing resistance and tensile strength of the pre-tensioning method centrifugal concrete pile are enhanced. The invention further relates to the 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 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

Images