A method for detecting the existing prestress of concrete bridge structure

A technology of bridge structure and concrete, applied in the field of bridge inspection of bridge engineering, can solve the problems of not proposing a good solution, inconsistent test results, inconsistent sensor selection, etc., to achieve small structural damage, strong operability, and real high sex effect

Active Publication Date: 2018-01-02
天津市市政工程研究院
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Problems solved by technology

At the same time, various scholars have conducted research on the release method, and the experimental conclusions they have drawn are not consistent, such as the depth of the stress release being zero, etc., and the selection of sensors is also inconsistent. They agree with the factors that affect the test, such as deflection, Temperature, water, etc., but none of them came up with a good solution
In addition, due to the differences in the selection of cutting tools, the strain data is greatly affected by the disturbance of the cutting tools on the concrete
Restricted by these uncertain factors, although the stress relief method is currently a hot topic in research, there is still a certain distance from the practical application of engineering.

Method used

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  • A method for detecting the existing prestress of concrete bridge structure
  • A method for detecting the existing prestress of concrete bridge structure
  • A method for detecting the existing prestress of concrete bridge structure

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Embodiment Construction

[0048] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0049] A method for detecting the existing prestress of a concrete bridge structure, the steps of the method are as follows:

[0050] ⑴ Test section selection:

[0051] The test section is selected in the uniform stress area of ​​the concrete bridge structure, and the test area is arranged on the side or bottom of the concrete bridge structure, and the area with dense steel bars is avoided.

[0052] For multi-span bridges, representative or most unfavorable bridge spans should be selected for stress release test. When selecting test components, structural technical conditions and structural forces should be considered comprehensively to reflect the most unfavorable principle. Detect the parameters such as appearance defects and deformation ...

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Abstract

The invention relates to an existing-prestress detection method for a concrete bridge structure. The existing-prestress detection method includes the following steps of 1 selecting a testing section, 2 determining a slotting parameter, 3 determining the detection time, 4 preparing and checking a sensor, 5 arranging the sensor, wherein a measuring piece and a compensation piece are arranged, 6 conducting a slotting test and data acquisition, wherein the step comprises the processes of slotting position positioning and interval, the effective slotting length determination, cutting machine control parameter adjusting and concrete cutting, 7 acquiring data and stabilizing requirements, 8 analyzing the data, wherein when the cutting depth is 34 mm, the existing-prestress of the testing section is calculated according to the formula (please see the formula in the specification) and 9 repairing the tested region portion. The existing-prestress detection method for the concrete bridge structure has the advantages of being standard in operation procedure, high in tested data reality and high in operability of the test process.

Description

technical field [0001] The invention belongs to the bridge detection technical field of bridge engineering, in particular to a method for detecting the existing prestress of a concrete bridge structure. Background technique [0002] The size of existing prestress is the main index to evaluate the bearing capacity of prestressed components. At present, there are obvious deficiencies in the existing prestress detection of prestressed concrete bridges. Relevant literature points out that there is no method that can accurately detect the existing prestress value of prestressed structural members. Existing existing prestress testing techniques include: SSRHT method, shape memory alloy (SMA) technology, acoustic emission technology, electromagnetic effect detection method, gray theory, probability analysis model, research method of structural force status based on sensitivity analysis, dynamic Test method, stress relief method, etc. Some of these methods have a high degree of da...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M99/00
Inventor 郑连生孙运国何立忠王甫友杜建涛常翔宇刘野滑会倩王宝林金阳王振宇
Owner 天津市市政工程研究院
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