For the connection mode of cast pier, the grouting sleeve connection is the most widely used at home and abroad, in which the plumpness of grouting material in the sleeve plays a key role in the overall stress of cast pier.

It can realize the rapid and full detection of sleeve grouting.

The research results of the project have been appraised by the appraisal committee headed by Ning Pinghua, a famous bridge expert in China and the first survey and design master in Guangdong Province.

▲ plumpness detection and on-site communication of sleeve grouting of cast bridges ▲ project on-site research and development background in order to meet the growing urban development and travel needs of urban population, the fully precast urban bridge technology came into being.

The comparative test between the new technology and the traditional sleeve grouting plumpness embedded sensor method is also carried out on the project site.

The detection technology of sleeve grouting plumpness of cast structure based on electrical principle has not only been popularized and applied in this cast bridge project, but also successfully applied in many cast construction projects such as the school teaching building in Sanlian north area of Licheng street, Zengcheng District, Guangzhou and the new library of Qingyuan library, It has been highly praised by the project owner and has a broad market application prospect.

(hereinafter referred to as “municipal detection company”) under Guangzhou Academy of construction Sciences Group has been successfully applied in the key construction project of Guangdong Province and the first large-scale cast bridge project in Guangdong Province – the south section of the connecting line between Guangzhou Dongxiao South Road and Guangzhou south railway station.

▲ technology incorporated into cma testing qualification parameters ▲ technology won the second prize of science and technology award of Guangdong civil engineering and architecture society.

The popularization of this innovative achievement is conducive to improving the quality inspection technology system of sleeve grouting of cast structures in China, and provides a reliable quality supervision means for the healthy and orderly development of current cast construction technology.

Relevant technical research results have been incorporated into the technical standard for durability of precast building concrete structures of Guangdong Province, and won the second prize of science and technology of Guangdong civil architecture society.

The equipment judges the plumpness of sleeve grouting through the change of electrical parameter index of sleeve grouting outlet.

As the sleeve grouting construction is a concealed project, the grouting plumpness detection has always been a recognized problem in the industry.

Now it has passed the inspection and testing capability certification of Guangdong market supervision and administration, and has been included in the CMA Testing qualification parameters.

The results show that the new technology is highly reliable for the detection of sleeve grouting plumpness of bridge pier columns.

Recently, the sleeve grouting plumpness detection technology based on electrical principle independently developed by Guangzhou municipal engineering test and detection Co., Ltd.

The appraisal conclusion is that “the research results have reached the international leading level on the whole”.

For example, although the embedded sensor method can judge the plumpness of sleeve grouting through the vibration attenuation law of damping sensor, the sensor cost is high and the installation method has a great impact on the result discrimination, so it is difficult to realize full detection; The test results of embedded steel wire drawing method are affected by many factors on site, and the test results are discrete, which can not be implemented in the grouting process; X-ray imaging method can accurately identify the grouting defects in the sleeve, but the maximum test thickness is less than 30cm, which is difficult to adapt to the thickness of cast pier.

In order to break through the limitations of the existing sleeve grouting quality testing methods, after nearly three years of research and development, the municipal testing company has put forward the core technology of sleeve grouting fullness detection of assembled structure based on electrical principle, and developed the international first electrical testing equipment for sleeve grouting fullness of assembled structure.

This core technology has applied for 7 national patents, including 3 invention patents, 1 International PCT patent and 3 authorized utility model patents.

▲ sleeve grouting plumpness detector and detection principle based on electrical principle.

It has the technical advantages of timely and accurate detection results and efficient on-site operation, and the detection cost is low, which is only one twentieth of the cost required by similar technologies.

Text: Municipal testing company Yang Jun Du yongxiao Lin Xiaoping editor: recommended reading by the party masses work department 01 the Party committee of Guangzhou Academy of construction Sciences Group held a learning (expansion) meeting of the theoretical learning center group 02 Guangzhou Testing Center entered the field of underwater testing and monitoring 03 Guangzhou testing center was invited to participate in the supervision and sampling inspection of civil air defense projects.

Fixing Socket

This technology has also been recognized by experts in inspection and testing related fields of Guangdong market supervision and administration, and has been successfully selected into the capability parameter library.

At present, the commonly used detection methods include embedded sensor method, embedded steel wire drawing method and X-ray imaging method, but there are deficiencies in application.