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Concrete bridge prestress finish rolling twisted steel bar tensioning force and torque detection system and method

A technology of finishing rolling thread and torque detection, applied in the direction of using stable tension/pressure test material strength, using stable torsion force test material strength, measuring device, etc., can solve the problem of large steel tension loss and other problems

Pending Publication Date: 2021-09-10
GUANGDONG HELI CIVIL ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, one of the objects of the present invention is a tension torque detection system for prestressed finish-rolled threaded steel bars in concrete bridges, which effectively solves the problem of excessive tension loss of prestressed finished-rolled threaded steel bars, and effectively prevents prestressed finished-rolled threaded steel bars from Stressed concrete structures crack or fail, increasing structural stability and reliability

Method used

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  • Concrete bridge prestress finish rolling twisted steel bar tensioning force and torque detection system and method
  • Concrete bridge prestress finish rolling twisted steel bar tensioning force and torque detection system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Concrete Bridge Prestressed Finish Rolled Rebar Tension Torque Detection System

[0034] Concrete bridge prestressed finish-rolled rebar 1 tension torque detection system, including finish-rolled rebar 1, bellows 2, tension end anchor plate 6, fixed end anchor plate 7, sleeve 8 and digital display electric torque The wrench 9, the anchor backing plate 6 at the tension end and the anchor backing plate 7 at the fixed end are arranged parallelly up and down in the web of the concrete bridge, and the finished-rolled threaded steel bars 1 pass through the anchor backing plate 6 at the tension end and the anchor backing plate 7 at the fixed end in sequence, Among them, the upper end of the fine-rolled threaded steel bar 1 is connected to the tension-end anchor plate 6 through the tension-end anchor 4, the lower end of the fine-rolled threaded steel bar 1 is connected to the fixed-end anchor plate 7 through the fixed-end anchor 5, and the bellows 2 is set On the fini...

Embodiment 2

[0039] Example 2 The detection test obtains the average value of the torque coefficient of the connection pair of the finish-rolled rebar 1, obtains the tension control torque value of the pre-stressed finish-rolled rebar 1, and carries out the pre-stressed finish-rolled rebar 1-tension construction.

[0040] Such as figure 1 As shown, the finished rolled rebar 1 for the test should be randomly selected from the batches to be installed at the construction site, and 3 sets of each specification should be selected for the test. Before the test, the fine-rolled threaded steel bar 1 is penetrated into the axial force meter 12, and the axial force meter 12 is installed between the fixed end anchor 5 and the fixed end anchor plate 7. During the test, start the digital display electric torque wrench 9 to tighten the tension end anchorage 4 until the axial force meter 12 reaches the design value of the tensile force of the finished rolled threaded steel bar 1. At this time, record the...

Embodiment 3

[0044] Embodiment 3 detects prestressed finish-rolled rebar 1 torque and tensile force

[0045] Such as figure 2 As shown, the difference from Embodiment 1 is that the axial force gauge 12 does not need to be installed. The prestressed finish-rolled rebar 1 tension test adopts the loose buckle method, and the test should be carried out between 1 hour and 48 hours after the tension construction. When testing, start the digital display electric torque wrench 9 to loosen the anchorage 4 at the tension end. Calculate the measured value of the prestressed finish-rolled rebar 1 tension tension, where: T is the prestressed finish-rolled rebar 1 tension control torque or the prestressed finish-rolled rebar 1 tension torque (N.m), P is the prestressed Stressed finish-rolled rebar 1 tension control force or prestressed finish-rolled rebar 1 tension design value or prestressed finish-rolled rebar 1 tension measured value (kN), K is prestressed finish-rolled rebar 1 connection pair to...

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Abstract

The invention relates to the technical field of tensioning force and torque detection, and discloses a concrete bridge prestress finish rolling twisted steel bar tensioning force and torque detection system which comprises a finish rolling twisted steel bar, a corrugated pipe, a tensioning end anchor bearing plate, a fixing end anchor bearing plate, a sleeve and a digital display type electric torque wrench. The upper end of the finish rolling twisted steel bar is connected with the tensioning end anchor bearing plate through a tensioning end anchorage device; the lower end of the finish rolling twisted steel bar is connected with the fixing end anchor bearing plate through a fixing end anchorage device; the sleeve is arranged on the tensioning end anchorage device; and the digital display type electric torque wrench is arranged on the sleeve in a sleeving mode, so that the problem that the tensioning force loss of the prestress finish rolling twisted steel bar is too large is effectively solved, the prestressed concrete structure is effectively prevented from cracking or losing efficacy, and the structural stability and reliability are improved. The invention also discloses a concrete bridge prestress finish rolling twisted steel bar tensioning force and torque detection method, which is easy to operate, can meet the requirement of large-area detection on a construction site, and can adapt to various specifications of finish-rolled twisted steel prestressed systems.

Description

technical field [0001] The invention relates to the technical field of tension torque detection, in particular to a method and system for detecting tension torque of prestressed finish-rolled threaded steel bars of concrete bridges. Background technique [0002] The fine-rolled threaded steel bar is used as the vertical prestressed tendon of the web of the concrete box girder bridge. It has been widely used in vertical prestressed systems. However, many concrete box girder bridges have problems with web cracking during construction and operation. Relevant literature discloses that the vertical prestressing of the web cannot completely prevent the cracking of the web of the concrete box girder bridge. One of the main reasons is that the prestress In the tensioning construction of stress-finished threaded steel bars, the prestress loss is caused by the different construction proficiency of the workers, the error of the jack oil gauge, and the installation error of the anchor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/22
CPCG01N3/08G01N3/22G01N2203/0003G01N2203/0017G01N2203/0021G01N2203/028G01N2203/0676
Inventor 姚响宇江茂盛陆学村陈运辉范立朋钟建国陈善行林刚钟辉武
Owner GUANGDONG HELI CIVIL ENG CO LTD