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Detection and Repair Method of Reinforced Concrete Structure of Coastal Buildings

A technology of reinforced concrete and repair method, applied in building construction, building maintenance, construction, etc., can solve problems such as the inability to meet the requirements of building structure safety and use function, and the technical lag.

Active Publication Date: 2016-08-24
汕头市建设工程质量与安全中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, on the one hand, the durability of buildings in coastal areas has become increasingly prominent. On the other hand, in the construction industry, the technology for durability assessment and repair and reinforcement based on local environmental characteristics and engineering practice experience is obviously lagging behind, which can no longer meet the needs of maintenance. Structural safety and functional requirements of existing buildings

Method used

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  • Detection and Repair Method of Reinforced Concrete Structure of Coastal Buildings
  • Detection and Repair Method of Reinforced Concrete Structure of Coastal Buildings
  • Detection and Repair Method of Reinforced Concrete Structure of Coastal Buildings

Examples

Experimental program
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Effect test

Embodiment 1

[0045] In 2008, a multi-storey residential building in Guangao, Shantou City was inspected, and the carbonation depth of 20 columns on the first and second floors was randomly checked. The measured carbonization depth has a minimum value of 5.5 mm, a maximum value of 20.0 mm, an average value of 10.5 mm, and a standard deviation of 3.60. The carbonization depth with a 95% guarantee rate is 16.4 mm. Measure the thickness of the protective layer of the above column, the minimum value is 18.5mm, the maximum value is 38mm, the average value is 27.7mm, and the standard deviation is 3.44. The thickness of the protective layer with a 95% guarantee rate is 22 mm. The actual age of the structure is 19 years. According to the formula, , then the expected safe service life , the remaining safe use period is 34.2-19=15.2 years.

[0046] The chloride ion content of about 15 columns was randomly checked, and the powder was drilled at a depth of 5-10mm, 10-15mm, 15-20mm, 20-25mm, 25-30m...

Embodiment 2

[0050] In a hotel, the bottom column was tested in 2007, and the carbonization depth with a 95% guarantee rate was 9.2 mm, and the thickness of the protective layer was 24 mm. The actual age of the structure is 25.5 years. , the life expectancy , and the remaining safe use period is greater than 50 years.

[0051] The first, eighth, and twenty-story columns were respectively tested for chloride ion content in concrete. The average thickness of the protective layer was 25mm, and the critical concentration of chloride ion was taken as 0.4% (accounting for cement consumption). The calculation results are shown in the table below.

[0052]

[0053] Based on the above results, the remaining safe service life of the building based on durability is 39.7 years.

[0054] It can be seen that the influencing factor of the remaining safe service life of the building is chlorine salt erosion. The building is located in a coastal urban area more than 300 meters away from the coastli...

Embodiment 3

[0059] The teaching building of a private school had a structural age of 16 years in 2009, and some structural columns and floor members had peeling off of the concrete protective layer and corrosion of steel bars.

[0060] The carbonation depth of 30 concrete columns was sampled. The measured carbonation depth was 7.5 mm minimum, 23.5 mm maximum, 12.5 mm average, and 3.75 standard deviation. The carbonation depth with a 95% guarantee rate was 18.7 mm. Measure the thickness of the protective layer of the above column, the minimum value is 15.5mm, the maximum value is 36.5mm, the average value is 29.5mm, the standard deviation is 3.55, and the protective layer thickness with 95% guarantee rate is 23.7 mm. According to the formula, , then the expected safe service life , the remaining safe use period is 39.8-16=23.8 years. Extract 20 concrete pillars and measure the chloride ion content of each depth layer, through using the calculation method of the present invention, the ...

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Abstract

The invention discloses a method for detecting and repairing a reinforced concrete structure of a coastal building, which includes determining components for detection, selecting a repair method and performing technical repair. Detect and calculate according to the formula to obtain the remaining safe service life of the same type of concrete components affected by carbonation factors or chlorine salt erosion factors, and select the smaller value as the main factor affecting the aging of the structure in the present invention. Combined with the environmental conditions of the components, determine the function level of the components. Then, according to the function level and the main influencing factors of structural aging, determine the repair level and possible repair methods to repair the structural components. Compared with the current detection and identification modes that often adopt assumptions, the present invention has high pertinence and higher reliability and accuracy. After being repaired by the method of the invention, the durability of the component is improved, and the safe service life of the design standard can be restored.

Description

technical field [0001] The invention belongs to the field of structural identification and maintenance of fixed buildings, in particular to the technical method of durability identification and restoration of existing buildings. Background technique [0002] Concrete is currently the most widely used and used building material. In my country's modern industrial and civil buildings, reinforced concrete structures occupy a high proportion. Especially in coastal areas, there are a large number of concrete structure buildings. The aging phenomenon of concrete structures is very serious under the influence of various factors that may cause the performance degradation of concrete materials, especially the erosion of coastal warm and humid air currents. The problem of durability damage to building structures has become increasingly prominent. The ability to maintain the original performance of concrete for a long time has become weakened. Among the many reasons that lead to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04G23/02G01N33/38
Inventor 袁继雄陈志远
Owner 汕头市建设工程质量与安全中心
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