On the afternoon of September 15, the special seminar on "Innovative Construction Methods for Underground Space" was grandly held at the Municipal Design Building. The event was jointly hosted by the General Contracting Professional Committee, the Structural Professional Committee, and the Underground Space and Underground Engineering Discipline Committee of the Shanghai Municipal Engineering Design Institute (Group) Co., Ltd. With the theme of "Innovation Leads, Win-Win Future," the seminar invited chief engineers and project managers from enterprises in the underground space engineering construction field, along with designers from the Municipal Design Institute, totaling about 130 participants, to jointly discuss the technological development of innovative construction methods and equipment applications for underground space foundation construction.

▲Highlights of the Seminar

As an invited unit, Gong Xiugang, General Manager of Shanggong Machinery, attended the conference upon invitation and delivered a special report titled "Innovation and Application of Underground Space Construction Methods," focusing on key technologies such as the TRD method and construction equipment, the CSM method and construction equipment, the DMP method and construction equipment, the pile-planting method and construction equipment, and digital construction control technology.

▲Seminar Site

TRD Method and Construction Equipment

The report elaborated on the construction principles, construction processes, wall-forming methods, construction advantages, and application fields of the TRD method. Through new ultra-deep TRD technologies and typical construction cases, as well as the development history of Shanggong's TRD series construction equipment, it demonstrated the case results of Shanggong Machinery's TRD series method machines in ensuring wall quality and improving construction efficiency across numerous municipal engineering projects at various levels nationwide. In 2012, Shanggong Machinery independently developed China's first TRD equipment with a 61m construction capability. It has now formed three major series: TRD-60/70/80 (dual power system), among which the TRD-80E (pure electric power drive) method machine set a world record with a maximum construction depth of 86m, making the company a leading enterprise in TRD method machines in the industry. In 2022, the product series was further expanded with the launch of the TRD-C50 method machine, and with the market launch of the pure electric drive TRD-C40E this year, the "value competitiveness" of Shanggong Machinery's segmented products has been fully demonstrated, once again consolidating its leading position in the TRD industry. General Manager Gong cited multiple typical construction cases from across the country, conducted in-depth analysis of the main technical features, new technologies, and new intelligent control technologies of the full series of Shanggong Machinery's TRD method machines, and comprehensively introduced the core advantages of TRD method equipment in the field of equal-thickness cement mixing wall construction.

▲TRD Method Machine Construction Case

CSM Method and Construction Equipment

The CSM method, also known as the cutter soil mixing method, was presented in the report in combination with the CSM construction process and advantages. The report focused on sharing the technical innovation points of Shanggong Machinery's MS45 dual-wheel mixing drilling rig, including pure electric drive, high efficiency of variable-frequency speed-regulation motor direct drive, low operating cost, replacement of hydraulic transmission systems, low procurement cost, operating cost at 2/3 of hydraulic systems, power consumption as low as 8 kWh per cubic meter, 1.5 times overload capacity for time-sharing emergency operation, and forced motor cooling technology, as well as the product construction management system technology adopting multiple data acquisition and storage technologies, detection systems, monitoring systems, surveillance systems, and fault diagnosis systems, along with technical achievements in multiple typical construction cases.

▲MS Series Dual-Wheel Mixing Drilling Rig Construction Case

DMP Method and Construction Equipment

The DMP method is a brand-new digital micro-disturbance mixing pile technology. It is a construction method combining air and slurry, mainly designed to solve problems in traditional mixing pile construction such as uneven pile body strength, low informatization level, difficulty in controlling construction quality, excessive soil replacement, large construction disturbance, and low pile-forming efficiency. This method can effectively reduce resistance during deep mixing and improve the mixing uniformity of cement-soil and pile-forming quality. The corresponding construction equipment, the DMP-I digital micro-disturbance mixing pile machine, has the following features:

● Precise monitoring and real-time adjustment of slurry and air pressure to reduce formation disturbance;  

● Specially designed drill pipe to create release channels for slurry and air pressure;

● Cutting blades added as needed to prevent clay from adhering to the drill pipe and mud balls from forming, reducing disturbance to the formation;

● Special drilling tools and supporting equipment design to improve mixing uniformity, with pile verticality controllable within 1/300.

The report compared the DMP method with other traditional construction processes and showcased the latest project results and core construction advantages of grouting mixing technology and engineering cases in informatized control technology for underground engineering construction.

▲DMP-I Digital Micro-Disturbance Mixing Pile Machine Construction Case

Pile-Planting Method and Construction Equipment

The static drill rooted pile method refers to a pile foundation method in which a static drill rooted pile method drilling rig is used for drilling, deep mixing, and bottom-enlargement grouting mixing, and finally precast piles are implanted, with construction carried out according to processes such as drilling, bottom enlargement, grouting, and implantation. The pile-planting method features no soil squeezing, no vibration, and low noise; good pile-forming quality with fully controllable pile top elevation; extremely strong vertical compressive, uplift, and horizontal load resistance; and low slurry discharge.

The report explained the research background of the pile-planting method, its characteristics, equipment configuration, and construction cases, elaborating that Shanggong Machinery's SDP series static drill rooted pile method machines feature high torque, large drilling depth, high technological content, good reliability, and high construction efficiency, with performance reaching internationally advanced levels.

▲SDP Series Static Drill Rooted Pile Method Machine Construction Case

Digital Integrated Management Platform

How is the digital integrated management platform realized? The report used the DMP construction management system as an example to illustrate. The content collected and displayed by the DMP digital construction management system should include parameters such as grouting pressure, slurry flow rate, air injection pressure, in-ground pressure, pile-forming depth, pile-forming speed, and pile verticality. It can also generate construction record sheets containing parameters such as pile length, construction time, in-ground pressure, cement consumption, and pile verticality. At the same time, it can provide centralized control monitoring screens and remote monitoring via mobile phones, making operation and management easier and enabling owners to track the construction process and remotely supervise construction quality.

▲Digital Integrated Management Platform Report

▲On-Site Interaction and Joint Discussion on Underground Space Foundation Construction Methods

In the Q&A session at the end of the report, designers from the Shanghai Municipal Engineering Design Institute showed strong interest in Shanggong Machinery's new construction methods and eagerly raised questions on site. General Manager Gong Xiugang of Shanggong Machinery, together with chief engineers and project managers from enterprises in the underground space engineering construction field, answered these questions one by one.

In recent years, in order to promote the sustainable development of the construction industry, it is necessary to adhere to a green, low-carbon, energy-saving, and emission-reduction development path. The industrialization of foundation pit engineering is an effective means of achieving energy conservation and emission reduction. In construction projects involving underground structures and space utilization, such as building engineering, underground engineering, deep foundation pit retaining, revetment engineering, tunnels, and dams, the development of underground space structures toward larger scale, greater depth, tighter constraints, and more complex and variable conditions has also provided a broad stage for theories and technologies of underground structure and space utilization.

The national "14th Five-Year Plan": accelerate digital transformation, promote green development, comprehensively improve urban quality, and deeply advance low-carbon transformation in construction and other fields. Shanggong Machinery's series of method equipment has contributed to numerous underground space engineering construction projects and urban building deep foundation pit engineering applications across the country. To meet the engineering needs of ultra-deep foundation pits, the company has made unremitting efforts toward the development direction of intelligent, visual, informatized, and low-environmental-impact construction equipment.

Shanggong Machinery is committed to research on construction methods and construction equipment technologies related to the development of large underground spaces. Countless construction cases have proven that Shanggong Machinery has achieved important results in core equipment manufacturing technologies and construction method technology development, and has become the preferred choice for customers purchasing machines. Shanggong Machinery will always uphold the code of conduct of "Professional Service, Creating Value," and together with industry colleagues and customer friends, jointly achieve greater mutual benefit and win-win results, and work hand in hand to write a new chapter of future development!