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Measuring instrument for concrete void detection

A concrete and measuring instrument technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low efficiency, cumbersome and inconvenient operating procedures, etc.

Active Publication Date: 2018-10-23
SHENZHEN SINO NUCLEAR CO CREATION TECH CO LTD
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  • Application Information

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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a measuring instrument for detecting voids in concrete to solve the problems in the prior art that the operating procedures are very cumbersome, inconvenient and inefficient when using the neutron scattering method to detect voids and cavity depths

Method used

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  • Measuring instrument for concrete void detection
  • Measuring instrument for concrete void detection
  • Measuring instrument for concrete void detection

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Embodiment 5

[0079] As a specific implementation method of screening out the required first thermal neutron detector and second thermal neutron detector from preset multiple thermal neutron detectors, such as Figure 5 As shown, Embodiment 5 of the present invention includes:

[0080] S501. The processing unit reads thermal neutron count rates respectively corresponding to multiple thermal neutron detectors.

[0081] S502. The processing unit combines the multiple thermal neutron detectors in pairs, and calculates the count rate ratio of each combination.

[0082] Wherein, assuming that the number of thermal neutron detectors is I, the number of combinations obtained by pairwise combination of I thermal neutron detectors is C(I, 2)=I! / [(I-2)! ×2! ].

[0083] S503. The processing unit calculates the difference between the count rate ratio of each combination and its corresponding standard ratio threshold, and uses the thermal neutron detector in the combination with the largest absolut...

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Abstract

The invention provides a measuring instrument for concrete void detection, the measuring instrument is applicable to the technical field of neutron detection, and the measuring instrument comprises aneutron source, a processing unit, a first thermal neutron detector and a second thermal neutron detector; the neutron source is used for transmitting fast neutrons to concrete covered with a steel sheet; the first thermal neutron detector and the second thermal neutron detector are used for obtaining heat neutron counting rate N1 and heat neutron counting rate N2 at two locations, with differentdistances from the neutron source, on the steel sheet covering the surface of the concrete; the processing unit is configured to calculate the counting rate ratio of heat neutron counting rate N1 to heat neutron counting rate N2; the processing unit is further configured to obtain the thickness of the steel sheet covering the surface of the concrete, according to the thickness of the steel plate,a corresponding relationship between the counting rate ratio and a concrete void depth is found, and the concrete void depth corresponding to the counting rate ratio is determined according to the corresponding relationship. The measuring instrument saves a lot of cumbersome operation and greatly improves the efficiency of actual concrete void depth measurement.

Description

technical field [0001] The invention belongs to the technical field of neutron detection, in particular to a measuring instrument for detecting voids in concrete. Background technique [0002] In modern large-scale hydropower projects, traffic engineering and other buildings, there are often concrete buildings that need to be lined with steel plates or composite stress structures, usually pressurized tunnels or pipe holes, large-scale traffic immersed tube structures, high-speed rail track slabs, etc. For pressurized tunnels, large-scale traffic immersed tube structures, etc., due to some unavoidable technical problems in construction and site working conditions, the quality of pouring is affected, making it difficult to fill and compact concrete, especially at the joint surface between steel plate and concrete. void defect. These hollow and void defects are huge hidden dangers that directly cause deformation, instability and damage of the steel plate lining when the projec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/05
CPCG01N23/05G01N23/025G01N33/383G01N2223/106G01N2223/648
Inventor 朱洪叶卫列王东
Owner SHENZHEN SINO NUCLEAR CO CREATION TECH CO LTD
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