China Deep Foundation Engineering Network News On June 15, 2023, the "Spray-Expanded Conical Frustum Pressure-Grouted Pile" scientific and technological achievement evaluation meeting, jointly completed by Shandong Beiteli Foundation Engineering Technology Co., Ltd. and Shandong University and other units, came to a successful conclusion. The evaluation meeting was chaired by Division Chief Bi Jihua of the Science and Technology and Industrialization Development Center of the Ministry of Housing and Urban-Rural Development, and lasted three hours of evaluation and certification. The members of the evaluation committee unanimously determined that the overall technical achievement of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile" has reached the international advanced level.

"Spray-Expanded Conical Frustum Pressure-Grouted Pile" Scientific and Technological Achievement Recognized

Division Chief Bi Jihua of the Science and Technology and Industrialization Development Center of the Ministry of Housing and Urban-Rural Development Chairs the Meeting

At the beginning of the evaluation meeting, the host, Division Chief Bi Jihua of the Science and Technology and Industrialization Development Center of the Ministry of Housing and Urban-Rural Development, introduced the leaders and experts attending the evaluation meeting, announced the list of the evaluation committee, and on-site elected Academician Gong Xiaonan of Zhejiang University as chairman, Researcher Teng Yanjing of China Academy of Building Research Co., Ltd. and Master of Survey and Design Shen Xiaoke of Beijing Institute of Survey and Design Co., Ltd. as vice chairmen, and Master of Survey and Design Wang Duli of Shanghai Investigation, Design & Research Institute Co., Ltd., Researcher Gao Wensheng of Jianyan Foundation Engineering Co., Ltd., Professor-level Senior Engineer Fu Zhibin of Construction Comprehensive Survey and Design Research Institute Co., Ltd., Professor-level Senior Engineer Sun Hongwei of Beijing Institute of Architectural Design Co., Ltd., and Professor-level Senior Engineer Zhang Jinxun of Beijing Urban Construction Group Co., Ltd. as the five committee members, so as to ensure the fairness and impartiality of the evaluation committee.‍

Professor Zhang Qianqing, Professor and Doctoral Supervisor of Shandong University

Introduces the R&D, Production and Application of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile" Technology

Subsequently, the evaluation committee officially began. Professor Zhang Qianqing, professor and doctoral supervisor of Shandong University, introduced the R&D, production and application of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile" technology. After listening to the project achievement report of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile," the experts of the evaluation committee reviewed the evaluation documents and raised questions, and the R&D personnel gave professional answers to the experts' questions. After multiple rounds of intense questioning and answering, the experts of the evaluation committee, after discussion, unanimously determined that the overall technical achievement of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile" has reached the international advanced level, and read out the evaluation opinions on site.

Experts of the Evaluation Committee Raise Questions

R&D Personnel Give Professional Answers to Experts' Questions

"Spray-Expanded Conical Frustum Pressure-Grouted Pile" Achieves Multiple Innovative Results

Technical Advantages of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile"

Certified by the evaluation committee, the "Spray-Expanded Conical Frustum Pressure-Grouted Pile" jointly completed by Shandong Beiteli Foundation Engineering Technology Co., Ltd. and Shandong University and other units has achieved multiple innovative results. First, the project team pioneered the spray-expanded conical frustum pressure-grouted pile, adopting the spray-expansion, squeezing-vibration and pressure-grouting construction method to form a pile body with expanded diameter and variable-diameter pile body cross-section structure, significantly improving the bearing capacity per unit volume of concrete of the foundation pile.

Construction Technology of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile"

Second, the "Spray-Expanded Conical Frustum Pressure-Grouted Pile" project team developed multi-functional integrated pile-forming equipment for long spiral drilling, high-pressure jet grouting of cement slurry for expansion, squeezing-vibration pressure-grouting of concrete, lifting and placing of reinforcement cages, and spray-expansion quality control, and formed the construction technology of the spray-expanded conical frustum pressure-grouted pile.

Bearing Mechanism of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile"

Calculation Methods for Bearing Capacity and Settlement of the "Spray-Expanded Conical Frustum Pressure-Grouted Pile"

Finally, the "Spray-Expanded Conical Frustum Pressure-Grouted Pile" project team also revealed the mechanism by which the expanded-diameter body of the spray-expanded conical frustum pressure-grouted pile improves bearing capacity, and established calculation methods for the bearing capacity and settlement of the spray-expanded conical frustum pressure-grouted pile. These innovative results have played a very strong role in promoting the development of this technology and the entire industry.

Technical Standards and Honors

Patent Achievements

It is worth mentioning that the project team also chief-edited the standard of the China Association for Engineering Construction Standardization "Technical Standard for Spray-Expanded Conical Frustum Pressure-Grouted Pile" (T/CECS 657-2020), formed a provincial-level construction method of Shandong Province, obtained 1 US patent and 6 Chinese invention patents, and published 15 SCI/EI papers, with a solid theoretical and technical foundation. In addition, this technology has been widely applied in engineering projects in Shandong, Anhui, Yunnan and many other provinces and cities, with significant economic, social and environmental benefits and good prospects for promotion and application. Thanks to the dual certification of theoretical technology and on-site practice, this technical achievement was unanimously recognized by the evaluation committee as reaching the international advanced level.

Speech by Chairman Li Jinliang of Shandong Beiteli Foundation Engineering Technology Co., Ltd.

Chairman Li Jinliang of Shandong Beiteli Foundation Engineering Technology Co., Ltd. stated that Beiteli has been deeply engaged in the field of foundation engineering for many years and is well aware of the difficulties and pain points in the on-site construction process. To solve these problems and achieve better construction efficiency and construction results, Beiteli chose to cooperate with universities to promote technological revolution and innovation, and strive to contribute to the technological development and technical reform of the industry!