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Method for monitoring the compactness of self-compacting concrete pouring in large structural module walls

A self-compacting concrete, large-scale structure technology, applied in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of difficult repair, difficult equipment layout, complex steel structure, etc. Space-restricted, easy-to-use effects

Active Publication Date: 2016-09-14
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tests have proved that due to the complex structures such as shear studs and section steel inside the structural module, and the fact that the concrete itself is a heterogeneous material, the results of ultrasonic testing are far from satisfactory
Moreover, the ultrasonic testing equipment is relatively large, and it is difficult to arrange the equipment in a narrow space. It is not suitable for monitoring during the construction process.

Method used

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  • Method for monitoring the compactness of self-compacting concrete pouring in large structural module walls
  • Method for monitoring the compactness of self-compacting concrete pouring in large structural module walls

Examples

Experimental program
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Embodiment 1

[0019] Such as figure 1 As shown, the steps of a method for monitoring the compactness of self-compacting concrete pouring inside a large structural module wall of a nuclear power plant disclosed in this embodiment are as follows:

[0020] In the first step, before pouring self-compacting concrete in the wall 1 of the large structural module of the nuclear power plant, it is judged that there may be areas 2 that may not be compacted inside the wall 1;

[0021] The second step is to pre-embed 0.3mm in the wall 1 2 The cable 3, one end of the cable 3 is located in the area 2 where there may be hidden dangers of inconsistency, and at the same time, this end of the cable 3 does not touch the body of the large structural module, and the other end of the cable 3 is led out of the wall 1;

[0022] Step 3: In the process of pouring self-compacting concrete in the wall 1, when the area 2 where there may be hidden dangers of non-compacting or is covered by self-compacting concrete, an ...

Embodiment 2

[0025] Such as figure 2 As shown, the difference between a method for monitoring the compactness of self-compacting concrete pouring inside a large structural module wall of a nuclear power plant disclosed in this embodiment and Embodiment 1 is that:

[0026] In the third step, a multimeter is connected to the end of the cable 3 leading out of the wall 1 to form a loop.

[0027] The fourth step is changed to: observe the resistance value measured by the multimeter. If the resistance is small, it means that the concrete in area 2, which may have a hidden danger of non-compacting, is already dense. If the resistance approaches infinity, it means that there may be a hidden danger of non-compacting The concrete in area 2 is not compacted, and the rods such as steel bars are slightly disturbed in area 2 until the resistance value measured by the multimeter is significantly reduced, which proves that the concrete in area 2 is dense.

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Abstract

The monitoring of the pouring density of self-compacting concrete in the walls of large structural modules of AP / CAP series third-generation nuclear power plants is a construction problem that has not been fully and effectively solved so far. At present, the method for confirming the compactness of concrete in large structural modules is mainly ultrasonic testing. Tests have proved that due to the complex structure of shear studs and section steel inside the structural module, and the fact that the concrete itself is a heterogeneous material, the results of ultrasonic testing are not ideal. Moreover, the ultrasonic testing equipment is relatively large, and it is difficult to arrange the equipment in a small space. It is not suitable for monitoring during the construction process. The method invented in this patent adopts the method of detecting current or resistance in a closed circuit loop, which can monitor the compactness during the pouring process and rectify it in time, and has the advantages of simple operation, sensitivity, and accurate results.

Description

technical field [0001] The invention relates to a method for monitoring the compactness of self-compacting concrete pouring inside a large structural module wall of a nuclear power plant. Background technique [0002] AP / CAP series pressurized water reactor nuclear power technology is one of the most advanced third-generation nuclear power technologies in the world. Modular construction technology is one of the major features of this AP / CAP nuclear power technology. Modularization can save construction time to the greatest extent. This technology adopts a series of large-scale steel structure modules, such as CA01, CA02, CA03, CA04, CA20, etc. The internal structure of this type of steel structure module wall is complex, and the concrete poured inside the wall is self-compacting concrete, which cannot be vibrated with a vibrator. If the method is not properly controlled, the internal concrete will be difficult to compact, mainly in the following four types: 1) In the area b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00G01N27/04
Inventor 韩飞
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD