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A Method for Ultrasonic Detection of Bonding State of Steel Tube Concrete

A technology of concrete-filled steel tubes and bonding state, which is applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids, processing response signals of detection, instruments, etc. The effect of saving manpower and material resources, reducing the intensity of manual inspection, and intuitive results

Active Publication Date: 2015-09-16
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

However, this method cannot judge the bonding state of CFST, and the push-out test needs to prepare test sample tubes and conduct destructive tests, which consumes a lot of manpower, material and financial resources

Method used

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  • A Method for Ultrasonic Detection of Bonding State of Steel Tube Concrete
  • A Method for Ultrasonic Detection of Bonding State of Steel Tube Concrete
  • A Method for Ultrasonic Detection of Bonding State of Steel Tube Concrete

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Embodiment Construction

[0033] like figure 1 As shown, the invention discloses a method for ultrasonic testing of the bonded state of steel pipe concrete,

[0034] (1) Make a comparison sample with the same specification as the object to be inspected: the comparison sample uses a steel pipe with the same thickness and the same or similar acoustic performance as the object to be inspected, and concrete with the same composition as the object to be inspected. The same process as the object to be tested is used to bond the two together, so that the comparison sample has two bonding states: a well-bonded area and a completely delaminated area;

[0035] (2) Check whether the comparison sample can be used: use a digital ultrasonic detector, place the detection probe on the side of the steel pipe in the well-bonded area, and keep a good coupling with the steel pipe; adjust the gain knob of the instrument to reduce the amplitude of the sound pressure of the first interface echo When the reference wave height ...

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Abstract

A method for ultrasonic detection of bonding state of a steel pipe and concrete comprises the following steps: (1) making a compared sample same as the specification of a detected object; (2) detecting whether the compared sample can be used; (3) making a sensitivity curve; (4) carrying out detection: using a debugged digital ultrasonic detector to detect bonding state of a detected steel pipe and concrete, and observing the highest reflection amplitude of multiple times of interface echoes and the envelope diagram form of multiple times of interface echoes of the steel pipe and the concrete; if the highest interface reflection amplitude is higher than the lower line of the sensitivity curve, judging that bonding is bad; if the highest interface reflection amplitude is lower than or equal to the lower line of the sensitivity curve, judging that bonding is good; if the highest interface reflection amplitude is larger than or equal to the upper line of the sensitivity curve, judging that the steel pipe and the concrete are completely debonded. The method can realize fast, complete and reliable non-destructive detection to bonding state of steel pipes and concrete on site, realizes fast and effective evaluation for the bonding state of steel pipes and concrete in the premise that a steel pipe and concrete structure is not destroyed, and reduces manual detection intensity.

Description

technical field [0001] The invention relates to a method for detecting the bonding state of steel pipe concrete in a power grid transmission project, in particular to a nondestructive detection method for ultrasonic detection of the bonding state of steel pipe concrete. Background technique [0002] Due to the advantages of high bearing capacity, good plasticity and toughness, low cost and convenient construction, CFST has been widely used in engineering applications, such as bridges, high-rise buildings and residential buildings. Thin-wall centrifugal concrete steel pipe tower, as a kind of steel pipe concrete, has been widely used in power grid transmission projects, especially because it does not need pull wires and occupies a small area, it is widely used in cities. Once the steel pipe and concrete are separated, engineering accidents may occur at any time due to damage or failure of the steel pipe concrete structure, directly endangering national property and the lives ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
CPCG01N29/48G01N2291/015G01N2291/044
Inventor 李世涛蔡红生汪毅吴克华王朝华杨旭耿进峰
Owner STATE GRID CORP OF CHINA
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