Prestressed tendon threading device

A prestressed tendon and threading technology, which is applied in the field of threading devices and prestressed tendon threading devices, can solve problems such as easy torsion and winding, hidden dangers in tensioning operations, and affecting the quality of prestressed reinforced concrete structures. Achieve the effect of convenient operation, low cost and simple structure

Inactive Publication Date: 2013-10-23
TIANJIN SHINKUNTAI ADVANCED PRESTRESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the existing beam-through method, each of the prestressed tendons in the whole bundle is usually penetrated into the corrugated tube, and each prestressed tendon is prone to twist and tear with each other during the process of penetrating into the corrugated tube. Winding, leaving hidden dangers for subsequent tensioning operations, seriously affecting the quality of prestressed reinforced concrete structures

Method used

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  • Prestressed tendon threading device
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  • Prestressed tendon threading device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention. Such as figure 1 As shown, the present invention provides a prestressed tendon threading device, comprising an outer sleeve 1 and a traction head 2, the whole bundle of prestressed tendons 4 to be threaded is installed inside the traction head 2, and the end of the traction head 2 is provided with Through hole 22, the traction rope passes through the through hole 22 and one end is connected with the whole bundle of prestressed tendons 4 to be threaded, and the other end is connected with the winch. The inner wall of the outer sleeve 1 and the outer wall of the traction head 2 are correspondingly provided with threads 11 and 21, so that the traction head 2 can be screwed into the outer sleeve 1. A plurality of inner clamping pieces 3 are placed between the inner walls of the cylinder 1, and are arranged at intervals along the circumferential direction. The plurality of...

Embodiment 2

[0028] Figure 8 It is a schematic cross-sectional view of the entire bundle of prestressed tendons to be threaded in Example 3 of the present invention. Such as Figure 8 As shown, in this embodiment, the number of bundles of whole bundles of prestressing tendons 4 to be threaded is seven bundles. The outer diameter of the seven bundles is 100 mm. Correspondingly, the quantity of the inner clamping piece 3 is 3 pieces, the length of the inner clamping piece 3 is 50 mm, the inner diameter is 49 mm, the outer diameter of the thinner end is 52 mm, and the outer diameter of the thicker end is 56 mm. The first included angle α is 3.5°. The total length of the outer sleeve 1 is 120 millimeters, and the outer diameter is 59 millimeters. The inner diameter of the part with equal wall thickness is 52mm, the length of the part with gradual wall thickness is 48mm, the inner diameter gradually changes from 52mm to 51mm at the end, and the second included angle β is 3.8°. The length ...

Embodiment 3

[0030] Figure 9 It is a schematic cross-sectional view of the entire bundle of prestressed tendons to be threaded in Embodiment 4 of the present invention. Such as Figure 9 As shown, in this embodiment, the number of bundles of the whole bundle of prestressing tendons 4 to be threaded is thirteen bundles. Thirteen bundles have an outer diameter of 150 mm. Correspondingly, the quantity of the inner clamping pieces 3 is 4 pieces, the length of the inner clamping pieces 3 is 80 mm, the inner diameter is 74 mm, the outer diameter of the thinner end is 78 mm, and the outer diameter of the thicker end is 80 mm. The first included angle α is 4.6°. The total length of the outer sleeve 1 is 200 millimeters, and the outer diameter is 88 millimeters. The inner diameter of the part with constant wall thickness is 78 mm, the length of the part with gradual wall thickness is 80 mm, the inner diameter gradually changes from 78 mm to 76 mm at the end, and the second included angle β is ...

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Abstract

A prestressed tendon threading device comprises an outer sleeve (1) and a drawing head (2). A whole prestressed tendon (4) to be threaded penetrates the inside of the drawing head, threads are correspondingly formed on the inner wall of the outer sleeve and the outer wall of the drawing head, the drawing head is screwed into the outer sleeve, a plurality of inner clamping pieces (3) are placed between the outside of the whole prestressed tendon to be threaded and the inner wall of the outer sleeve and gradually thinned along the screw-in direction of the drawing head, part of the wall of the outer sleeve is gradually thickened along the screw-in direction of the drawing head, the drawing head is screwed into the outer sleeve, the front end of the drawing head is abutted to the tail ends of the inner clamping pieces, the outer walls of the inner clamping pieces slide along the inner wall of the outer sleeve, and the whole prestressed tendon to be threaded is fixedly clamped by the inner clamping pieces. The prestressed tendon threading device is simple in structure, low in cost and high in strength, the whole prestressed tendon cannot be twisted or winded in the threading process, and construction requirements of prestressed tendons for different numbers and structural diversity are met by series size settings of the prestressed tendon threading device.

Description

technical field [0001] The invention relates to a threading device, in particular to a threading device for prestressed tendons, and belongs to the technical field of civil engineering bridge construction. Background technique [0002] The so-called prestressed concrete structure is to artificially apply pressure to the structural members before they are subjected to external loads, and the resulting prestressed state is used to reduce or offset the tensile stress caused by external loads, that is, by means of concrete The higher compressive strength can make up for the lack of tensile strength, so as to delay the cracking of concrete in the tension area. The structure made of prestressed concrete usually adopts the method of tensioning steel bars to achieve the purpose of precompression stress, so it is also called prestressed reinforced concrete structure. In the construction process of railway and highway bridges, various continuous beams, continuous rigid frames and con...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): E01D21/00E04G21/12
Inventor牛坡师琳刘万宝
OwnerTIANJIN SHINKUNTAI ADVANCED PRESTRESSING TECH