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Cable-stayed bridge cable bent tower anchoring area prestressed reinforcement impact protection test device and method

A technology of prestressed steel bar and test device, which is applied in the direction of measuring device, using stable tension/pressure test material strength, bridges, etc. problems such as phenomenon and preventive effect test, to ensure the design and improve the safety factor

Inactive Publication Date: 2021-02-09
高军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the aforementioned patents do not consider testing the fracture phenomenon and pre-protection effect of prestressed steel bars, and there is currently no test device for testing the fracture phenomenon and pre-protection effect of prestressed steel bars.

Method used

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  • Cable-stayed bridge cable bent tower anchoring area prestressed reinforcement impact protection test device and method
  • Cable-stayed bridge cable bent tower anchoring area prestressed reinforcement impact protection test device and method
  • Cable-stayed bridge cable bent tower anchoring area prestressed reinforcement impact protection test device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0064] refer to Figure 1 to Figure 4 , a prestressed reinforcement impact protection test device in the cable tower anchorage area of ​​a cable-stayed bridge, comprising a loading device 100, a concrete model 200, a tension mechanism 300, a tension stand 400, a high-speed camera 500 and an acquisition instrument 600, and a tension stand 400 or more The semi-enclosed form is distributed on the side wall of the concrete model 200, and a plurality of tensioning mechanisms 300 and loading devices 100 are installed on the tensioning pedestal 400. The loading device 100 extends to the place where the concrete model 200 is located and abuts against the concrete from top to bottom. On the upper surface of the model 200, the extension lines of a plurality of tensioning mechanisms 300 are distributed vertically and horizontally and are connected with the concrete model 200. A high-speed camera 500 is arranged obliquely above the concrete model 200. The high-speed camera 500, the tension...

Embodiment 2

[0079] refer to Figure 1 to Figure 4 , a prestressed reinforcement impact protection test device in the cable tower anchorage area of ​​a cable-stayed bridge, comprising a loading device 100, a concrete model 200, a tension mechanism 300, a tension stand 400, a high-speed camera 500 and an acquisition instrument 600, and a tension stand 400 or more The semi-enclosed form is distributed on the side wall of the concrete model 200, and a plurality of tensioning mechanisms 300 and loading devices 100 are installed on the tensioning pedestal 400. The loading device 100 extends to the place where the concrete model 200 is located and abuts against the concrete from top to bottom. On the upper surface of the model 200, the extension lines of a plurality of tensioning mechanisms 300 are distributed vertically and horizontally and are connected with the concrete model 200. A high-speed camera 500 is arranged obliquely above the concrete model 200. The high-speed camera 500, the tension...

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Abstract

The invention discloses a cable-stayed bridge cable bent tower anchoring area prestressed reinforcement impact protection test device and method, and belongs to the technical field of cable-stayed bridge impact protection tests. The cable-stayed bridge cable bent tower anchoring area prestressed reinforcement impact protection test device comprises a loading device, a concrete model, tensioning mechanisms, a tensioning pedestal, a high-speed camera and an acquisition instrument; the tensioning pedestal is distributed on the side wall of a concrete model in a semi encircling form; the pluralityof tensioning mechanisms and the loading device are installed on the tensioning pedestal; extension lines of the multiple tensioning mechanisms are distributed vertically and horizontally and connected with the concrete model; the high-speed camera is arranged obliquely above the concrete model; and the high-speed camera, the tensioning mechanisms and the loading device are all electrically connected with the acquisition instrument. From the five aspects of protection effect, durability, construction difficulty, economic cost and structural appearance change degree, schemes of protection types are comprehensively compared with each other and selected, protection type selection of prestressed tendons is realized, and bridge engineering design accuracy and construction safety are ensured.

Description

technical field [0001] The invention relates to the technical field of impact protection tests of cable-stayed bridges, in particular to an impact protection test device and method for prestressed steel bars in anchorage areas of cable-stayed bridge pylons. Background technique [0002] Threaded steel bars for prestressed concrete, also known as finish-rolled threaded steel bars, are widely used in prestressed concrete bridge structures, such as cable-stayed bridge cable tower anchorage areas, concrete box girders and other parts. In order to make the concrete structure meet the design crack resistance requirements, construction It is necessary to apply a high level of elastic potential energy to the finish-rolled rebar in advance, and its material is brittle low-alloy steel, which is prone to delayed fracture. Some bridges even have sudden delayed fracture of prestressed rebar after 15 years of construction. , causing potential safety hazards and adverse social impacts on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/10E01D19/14E01D101/28
CPCE01D19/14E01D2101/28G01N3/10G01N2203/0003G01N2203/0017G01N2203/0044G01N2203/0067G01N2203/0647G01N2203/0676
Inventor 高军陈敏汤宇刘德安陈红胡恒良薛明智陈志明黄正凯乔保卫张松李行利游国平张晓晓林晓
Owner 高军
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