Following the assembly of more than 10 TRD construction method machines

4 DMP-I digitalized low-disturbance mixing pile machines followed closely

At the foundation pit observation event of the Pudong Airport Phase IV Expansion Project

An observation delegation of over 100 people "gathered around"

Shanghai Engineering Machinery's TRD and DMP construction methods

On the largest deep foundation pit project in China

Delivered stunning performance

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This scene is extremely satisfying

▲Site of the TAD/DMP construction method observation event

On May 10, 2023, the "TAD/DMP Construction Method Technical Exchange and Observation Event for the Pudong Airport Phase IV Expansion Project" was grandly held at the project site of the Pudong International Airport Phase IV Expansion Project.

▲Site of the TAD/DMP construction method technical exchange meeting

This observation and exchange meeting was hosted by the Geotechnical Mechanics Professional Committee of the Shanghai Society of Theoretical and Applied Mechanics, and co-organized by Huajian Group Shanghai Underground Space and Engineering Design Research Institute, Shanghai Mechanical Construction Group Co., Ltd., Shanghai Yuanfeng Underground Engineering Technology Co., Ltd., and Shanghai Engineering Machinery Plant Co., Ltd. More than 100 people from survey and design, construction, research institutes, universities, building technology enterprises and other units gathered to conduct technical exchanges and discussions and observe the construction of new methods, focusing on two new technologies: the TAD construction method for prefabricated retaining structures and the DMP construction method for digitalized low-disturbance mixing piles, from aspects such as design and construction.

The largest deep foundation pit project in China

The total foundation pit area of the Pudong International Airport Phase IV Expansion Project is approximately 340,000 m2, with a general excavation depth of about 18.6–30.7 m and a maximum excavation depth of about 36.7 m. It is currently the largest deep foundation pit project in China. Around the foundation pit there are sensitive protection targets such as the maintenance area, energy center, and airside rapid transit line. At the same time, multiple interconnected confined aquifers are distributed deep in the site, and the maximum drawdown of confined water during the implementation of the foundation pit reached 30 m. The foundation pit project is complex, and the control of deformation and confined water is difficult.

▲Site of the Pudong International Airport Phase IV Expansion Project

In the foundation pit project, a series of green, energy-saving and eco-friendly new technologies were comprehensively adopted, including underground diaphragm walls combined with suspended waterproof curtains using the ultra-deep equal-thickness cement-soil mixing wall method, pile-wall integration, TAD construction method prefabricated retaining structures, prestressed pipe pile retaining structures, assembled steel composite supports, ultra-high-pressure jet grouting, and DMP construction method digitalized low-disturbance mixing piles.

Co-creating and sharing new construction methods and new technologies

At the exchange meeting, the session was chaired by Chief Engineer Wu Jiangbin of Huajian Group Shanghai Underground Space and Engineering Design Research Institute.

▲Chief Engineer Wu Jiangbin chairing the meeting

In the first agenda of the meeting, Deputy Chief Engineer Song Qingjun of Huajian Group Shanghai Underground Space and Engineering Design Research Institute and Project Engineer Wang Boyang of Shanghai Mechanical Construction Group Co., Ltd. respectively delivered conference reports on the TAD construction method prefabricated assembled underground diaphragm wall technology, the principles and characteristics of the TAD construction method, equipment selection, construction technology, and construction method improvements.

▲Deputy Chief Engineer Song Qingjun delivering a conference report

▲Project Engineer Wang Boyang delivering a conference report

The TAD construction method refers to the trench-cutting assembled underground diaphragm wall construction method. This method is a construction process in which reinforced concrete prefabricated wall panels with prestressed mortise-and-tenon mechanisms {locks} are inserted into the middle of a trench-cutting cement-soil continuous wall to form an assembled underground diaphragm wall. Compared with traditional underground diaphragm wall construction processes, the TAD construction method has advantages such as less land occupation, strong adaptability, short construction period, and environmental friendliness.

▲Site of Shanghai Engineering Machinery's TAD construction method exhibition area

▲Construction cases of Shanghai Engineering Machinery's TAD construction method

Shanghai Engineering Machinery Plant Co., Ltd., Zhejiang Jitong Geotechnical and Underground Space Construction Technology Co., Ltd., the Coastal and Urban Geotechnical Engineering Research Center of Zhejiang University, Zhejiang Provincial Institute of Architectural Design and Research, Zhejiang Sci-Tech University, and Jianhua Building Materials (China) carried out in-depth industry-university-research cooperation, conducting systematic research on TAD construction method theoretical calculation, wall panel preparation, machinery manufacturing, etc., creating a new construction method for building foundation pit retaining construction.

The second agenda of the meeting: Dr. Li Qing of Huajian Group Shanghai Underground Space and Engineering Design Research Institute delivered a conference report on the DMP construction method digitalized low-disturbance mixing pile technology.

▲Dr. Li Qing delivering a conference report

The digitalized low-disturbance mixing pile (DMP construction method) uses the dedicated DMP-I digitalized low-disturbance mixing pile machine of Shanghai Engineering Machinery and a digitalized construction control system for automated construction control. Through the cutting blades on the drill pipe and the slurry and gas sprayed from the grouting (air) nozzles arranged on the mixing drill bit, the soil is cut jointly, and cement and other curing agents are uniformly mixed with the soil to form a pile body with certain strength and impermeability. Through automatic control of in-ground pressure and the discharge of slurry and gas from the multi-channel special-shaped drill pipe, minimal disturbance to the surrounding soil during the entire pile-forming process is achieved. It is referred to as the DMP construction method.

▲Site of Shanghai Engineering Machinery's DMP construction method exhibition area

▲Construction cases of Shanghai Engineering Machinery's DMP construction method

The DMP-I digitalized low-disturbance mixing pile machine (DMP construction method equipment) is a new digitalized construction technology mixing pile drilling machine jointly developed by Shanghai Engineering Machinery with well-known domestic enterprises, institutes, and universities. It is mainly intended to solve problems in traditional mixing pile construction such as slight non-uniformity of the pile body, low informatization level, difficulty in controlling construction quality, large amount of displaced soil, large construction disturbance, and low pile-forming efficiency. The equipment adopts digitalized construction technology and has characteristics such as high safety and reliability, high pile-forming quality, small disturbance to the surrounding environment, and high construction effectiveness. Through GPS pile position setting-out, the pile diameter is 850 mm, and the maximum construction depth can reach 45 m. It can effectively reduce resistance during deep mixing and improve the mixing uniformity of cement-soil and pile-forming quality. The equipment can not only add cutting blades as needed to prevent clay from adhering to the drill pipe and the formation of mud balls, reducing disturbance to the stratum, but also has special designs for drilling tools and supporting equipment. The pile verticality can be controlled within 1/300, and construction efficiency is significantly improved.

DMP-I digitalized low-disturbance mixing pile machine cluster shines

On a warm spring afternoon, the observation site of the foundation pit project of the Pudong Airport T3 project was under vigorous construction. The observation site first observed the TAD construction method construction site.

▲TAD construction method construction observation site

Afterwards, the delegation went to the DMP construction method construction site, where multiple DMP-I digitalized low-disturbance mixing pile machines formed the most beautiful Shanghai Engineering Machinery green, which was truly spectacular.

DMP construction method construction observation site

The Pudong International Airport Phase IV Expansion Project is an important transportation support facility to ensure the future development of Pudong International Airport. After completion, the project will comprehensively enhance the capacity of Pudong Airport and provide foundational support for building a world-class international aviation hub.

As witnesses to this grand TAD/DMP construction method technical exchange and observation event, more than 100 participating representatives took group photos at the construction site to co-create and share new construction methods and new technologies.

▲Observation representatives taking a group photo

Shanghai Engineering Machinery is committed to the development and construction of underground space construction and related construction technology research, committed to providing customers with overall underground foundation solutions, and helping national urban infrastructure construction. It always adheres to the concept of "professional service, creating value" and always insists on developing together with customers. Shanghai Engineering Machinery will, as always, leverage its deep accumulation in the field of piling machinery to fully meet customers' construction needs, provide professional services to customers, and create value.