Green energy saving and environmental protection new technology! The TAD/DMP construction method technology exchange and observation activity of the fourth phase expansion project of Pudong Airport was grandly held!

After the assembly of more than 10 TRD engineering machine clusters 

4 DMP-I digital micro-disturbance mixing pile machines followed closely 

Site of Foundation Pit Observation Meeting of Pudong Airport Phase IV Expansion Project 

More than 100 people watching the group “onlooker” 

SEMW TRD, DMP method 

In the largest deep foundation pit project in China

On May 10, 2023, the “TAD/DMP Technology Exchange and Observation Activity of Pudong Airport Phase IV Expansion Project” was grandly held at the site of Pudong International Airport Phase IV Expansion Project. 

This observation and exchange meeting was hosted by the Rock and Soil Mechanics Professional Committee of the Shanghai Mechanics Society, Huajian Group Shanghai Underground Space and Engineering Design Research Institute, Shanghai Machinery Construction Group Co., Ltd., Shanghai Yuanfeng Underground Engineering Technology Co., Ltd., and Shanghai Engineering Machinery Co., Ltd. participated in the co-organization. More than 100 people from survey and design, construction, scientific research institutes, universities, construction technology enterprises and other units gathered around the two new technologies of TAD construction method prefabricated enclosure structure and DMP construction method digital micro-disturbance mixing pile, from design, Construction and other aspects of technical exchanges, discussions and construction observation of new construction methods.

The largest deep foundation pit project in China 

The total area of the foundation pit of the Phase IV expansion project of Pudong International Airport is about 340,000 m2, the general excavation depth is about 18.6-30.7 m, and the maximum excavation depth is about 36.7 m. It is currently the largest deep foundation pit project in China. Around the foundation pit, there are sensitive protection objects such as maintenance area, energy center, and airside MRT line. At the same time, there are multi-layered interconnected confined aquifers distributed in the deep layer of the site, and the maximum drop of confined water during the excavation period reached 30m. The foundation pit engineering is complex, and the deformation and confined water control are difficult. 

In the foundation pit project, the underground diaphragm wall combined with the ultra-deep and equal-thickness cement-soil mixing wall construction method is used to suspend water-proof curtain, pile-wall integration, TAD construction method prefabricated enclosure structure, prestressed pipe pile enclosure structure, assembled steel combination A series of green, energy-saving and environmentally friendly new technologies such as support, ultra-high pressure jet grouting, and DMP construction method digital micro-disturbance mixing pile.

Co-create and share new construction methods and new technologies 

On the first agenda of the meeting, first, Song Qingjun, deputy chief engineer of Shanghai Underground Space and Engineering Design Institute of Huajian Group, and Wang Boyang, project engineer of Shanghai Machinery Construction Group Co., Ltd., respectively explained the prefabricated underground diaphragm wall technology of TAD construction method, the principle of TAD construction method and The meeting report will be made on the aspects of characteristics, equipment selection, construction technology, construction method improvement and so on.

The TAD construction method is the construction method of the canal-cut assembly underground diaphragm wall. This construction method is to insert a reinforced concrete prefabricated wall panel with a prestressed mortise and tenon mechanism {lock buckle} in the middle of the canal-cut cement-soil diaphragm wall to form a prefabricated underground diaphragm wall. Compared with the traditional underground diaphragm wall construction process, The TAD construction method has the advantages of less space occupation, strong adaptability, short construction period, and environmental protection.

Shanghai Engineering Machinery Co., Ltd., Zhejiang Jitong Ground and Air Construction Technology Co., Ltd., Zhejiang University Binhai and Urban Geotechnical Engineering Research Center, Zhejiang Architectural Design and Research Institute, Zhejiang University of Science and Technology, and Jianhua Building Materials (China) have carried out in-depth industry-university-research cooperation, Carry out systematic public relations on the theoretical calculation of TAD construction method, wall panel preparation, machinery manufacturing, etc., and create a new construction method for building foundation pit enclosure. 

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

Digital micro-disturbance mixing pile (DMP construction method) adopts the DMP-I digital micro-disturbance mixing pile machine special equipment of Shanggong Machinery, and uses the digital construction control system to carry out automatic construction control. The slurry and gas ejected from the grouting (air) port cut the soil together, and evenly mix the cement and other curing agents with the soil to form a pile with a certain strength and impermeability. Through the automatic control of the internal pressure and the multi-channel The slurry discharge and exhaust of the special-shaped drill pipe realize the slight disturbance of the soil around the pile during the whole process of pile formation, which is referred to as the DMP method.

DMP-I digital micro-disturbance mixing pile machine (DMP construction method equipment) is a new digital construction technology mixing pile drilling machine jointly developed by SEMW and well-known domestic enterprises, institutes, and universities, mainly to solve the pile body during the construction of traditional mixing piles. Slightly uneven, low level of informatization, difficult to control the construction quality, more replacement soil, large construction disturbance, low pile formation efficiency and other problems. The equipment adopts digital construction technology, which has the characteristics of high safety and reliability, high pile quality, little disturbance in the surrounding environment, and high construction effect. Through GPS pile position setting out, the pile diameter is 850mm, and the maximum construction depth can reach 45m. The resistance during mixing can improve the mixing uniformity of cement soil and the pile quality. The equipment can not only add cutting blades as needed, prevent clay from sticking to the drill pipe and form mud balls, and reduce disturbance to the formation, but also has a special design of drilling tools and supporting equipment, and the verticality of the pile can be controlled at 1/300. The efficiency is obvious. 

SEMW is committed to the development and construction of underground space construction and related construction technology research, and is committed to providing customers with overall solutions for underground foundations, helping the construction of national urban infrastructure, always adhering to the concept of “professional services, creating value” Customers develop together. Shanggong Machinery will, as always, use its deep accumulation in the field of pile machinery to fully meet the construction needs of customers, provide professional services for customers, and create value.