Tensioning device for the manufacture of concrete piles with steel strands

Abstract

The invention relates to a tension device used for manufacturing concrete piles with steel strands. The tension device comprises a steel reinforcement cage, an anchor plate and a tension plate; the steel reinforcement cage comprises the steel strands, stirrups and end plates; the end plates are connected with the steel strands through clamping piece assemblies; and the end plate at one end is fixed with the anchor plate. The tension device is characterized in that a plurality of first perforations are formed in the anchor plate, first connection seats are detachably fixed in the first perforations, first thread through holes are formed in the first connection seats, internal treads of the first thread through holes are connected with first ejector rods, and inner ends of the first ejector rods are propped against outer end surfaces of the clamping piece assemblies. The steel strands are flushed with the outer end surfaces of the clamping piece assemblies through the first ejector rods, the concrete piles after centrifugation have no steel strands exposed out of the end plates at the ends; and the clamping piece assemblies cannot fly out of the anchor plate under the action of the connection seats and the ejector rods, an accident that the clamping piece assemblies quickly fly out of the anchor plate and hurt equipment and people is avoided, and the use is safer.

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 tensioning device for manufacturing concrete piles with steel strands. Background technique [0002] Due to the high tensile strength of the steel strand (the design value of the tensile strength is 1320MPa, and the highest tensile strength can reach 1960MPa), in recent years, Chinese enterprises and scientific research institutions have also conducted a lot of research on the application of steel strands to centrifugal concrete piles. , but so far no technical solutions with practical value have emerged. For this reason, someone has developed a concrete pile with a steel strand that overcomes the connection and fixation problem of the steel strand in the pretensioned centrifugal concrete pile, makes it possible to use the steel strand for the main reinforcement inside the centrifugal concrete pile and has pr...

AI Technical Summary

Problems solved by technology

[0004] The tensioning device disclosed in the aforementioned patent can produce centrifugal concrete piles with steel strands, but it also has the following defects: 1. After forming the concrete pile, the steel strands in the pile body after centrifugal formwork removal will expose the pile body The end of the end plate, the final product needs to cut off and polish the steel strands exposed on the outer end surface of the end plate, which will cause waste of steel strands and an extra processing step

2. Due to the need for pre-tensioning, in order to allow the through-hole jack to pass through the anchor plate, a larger hole must be opened on the anchor plate. The diameter of the hole is larger than that between the periphery of the clip assembly. , the steel strand may be broken during the centrifugal forming process due to different lengths and uneven force, and the breakage of the steel strand may also cause the clip assembly to fly out of the hole of the anchor plate, and the clip assembly flies out quickly There are accidents that damage equipment and hurt people, that is, there are certain potential safety hazards

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