The airport connection line project in urban rail transit line of Shanghai Metro has a total length of 68.6 km and passes through Minhang, Xuhui and Pudong Districts, with 9 stations throughout the line. The project is scheduled to be completed for operation in 2024. At that time, the transit time between Hongqiao Airport and Pudong Airport is expected to be within 40 minutes. The airport connection line project is the first rail transit project that connects the national railway in China. As an east-west fast track connecting Hongqiao hub and Pudong hub, the project contributes to enhancing Shanghai radiation and service functions to the Yangtze River Delta. It provides strong support for Shanghai to improve its urban capacity level and core competitiveness, and to implement the national strategy of integrated development in the Yangtze River Delta. STEC undertook the construction tasks at Sections 3, 4, 5 and 12 in the airport line. They involve difficulties and highlights in ultra-low altitude construction work, super-deep diaphragm construction, ultra-long precipitation, super-large foundation pit construction, ultra-high structure construction, ultra-close crossing, internal assembly construction with fully prefabricated tunnel segments, etc.

The platform is a comprehensive urban grid management system integrating road network facility management, emergency resource management, maintenance plan management, operation monitoring management and emergency management, so as to control the operation status of road network facilities in megacities in real time and comprehensively, and greatly improve the operation and maintenance service level of urban transportation infrastructure. The platform has digitized the documentation of 1,900 km of road, bridge and tunnel infrastructure, deployed the fine management of 10-meter-level road network, managed 5000+ users, 2000+ suppliers, 2000+ professional vehicles and 200+ maintenance bases with mature big data management and decision-making mechanism, processed 5TB of data annually, received 200,000 work orders and handled 100,000 incidents. The data accumulation and management mode has been continuously iterated and optimized. The overall control of urban operation safety, operation efficiency and facility safety state has been improved, the human cost expenditure has been greatly reduced, the management resources and cost input have been optimized, and the digital transformation and high-quality development of urban operation management have been supported.

Channel improvement of Chuangxin River in Zhangjiabang Wedge Green Belt (Cuibai Road - Niuqiao Port) and Niuqiao Port (Majiabang - Guanglan Road) is located in Jingang Road of Pudong New Area. The improvement center covers a total length of 1,152 m, among which the length of channel to be improved in the Chuangxin River is 529.2 m. The reach starts from Cuibai Road in the north and ends at Niuqiao Port in the south. The length of channel to be improved in Niuqiao Port is 622.8 m, which starts from Majiabang and ends at Guanglan Road. In this project, STEC constructed about 2, 300-meter revetment, 3,000-meter flood control channel and 13,800-square-meter green space.
The improved Chuangxin River in Zhangjiabang Wedge Green Belt and river channel at Niuqiao Port demonstrate the unique landscape charm of ecological banks with their brilliant ecological appearance. Meanwhile, the project can revitalize the regional water systems, create a natural, comfortable and pleasant river landscape, and further improve the regional capacity for flood control, water logging removal, irrigation regulation and storage. It not only enhances the natural environment on the surrounding land but also "refresh" the life of local residents.

The designed daily hydrogen refueling capacity of the project is 1000 kg. The project has been constructed in two phases. Phase I hydrogen refueling station saw a total investment of CNY 12 million yuan and covered an area of about 4,000 m2, which includes compressor, hydrogen storage cylinder, hydrogen refueling machine, water chiller and other devices. This project has acquired the first Hydrogen Cylinder Refilling License among hydrogen refueling stations in Qingdao City, and been the first completed hydrogen refueling station at a port in China at present. The project has gone through all the completion acceptance and qualification procedures for planning and fire control, and been operated under full qualification and license. This station, upon its operation, has successfully met the demand from vehicles for hydrogen refueling in Qianwan Port Area of Qingdao Port in Shandong Province. It plays an demonstrative and leading role in the construction of "hydrogen port in China".

The Phase Ⅲ reconstruction and expansion project of Shanghai Songshen Water Environment Purification Co., Ltd. is located on the south of the company, the south side of Tongxin Road and the east side of Beimaojing. The construction contents involve the sewage plant and the pipeline for pump station outside the plant. The sewage plant involves the following tasks: Upgrade and reconstruct Phases I and II, and expand the capacity of Phase Ⅲ; the treatment capacity of Phase I and II is 140,000 m3/d; upgrade and reconstruct the current situation of Phases I and II, and reduce the capacity by 20,000 m3/d; the sewage treatment capacity will be expanded by 80,000 m3/d in Phase Ⅲ. After the reconstruction and expansion, the whole plant will receive new actual processing capacity of 60,000 m3/d, and its total processing capacity will be 200,000 m3/d. This will greatly improve the sewage treatment capacity in Songjiang area. The effluent quality will not be lower than Grade A standard. That is of great significance for the water source protection in the upper reaches of Huangpu River, the local ecological environment protection and the livelihood improvement.

STEC Urban Operation establishes the bridge operation mode, strengthens the operation standard and improves the operation concept for the Hong Kong-Zhuhai-Macao Bridge Administration Bureau through comprehensive and in-depth consultation services from multiple perspectives of the document system for operation standards, the organizational framework and staffing, the management system, the technical document system, the outsourcing management, the government affairs linkage, the comprehensive development, etc. Those efforts contribute to the smooth transition of the Hong Kong-Zhuhai-Macao Bridge from the construction period to the operation period, and provide a strong technical service support for the safe, orderly and efficient operation of the facility during the subsequent trial operation period.

The project is located at Gaoming District, Foshan City, Guangdong Province, and covers a total area of 6, 961.8 m2. Centering on the development theme of “energy + technology towards carbon neutrality”, the project creates an integrated station for hydrogen production from natural gas and in-station hydrogen refueling. Among them, the hydrogen production module adopts the first set of skid-mounted natural gas-hydrogen production facility in China with independent intellectual property rights. It is designed to construct a comprehensive energy supply station integrating natural gas hydrogen production, photovoltaic power generation coupled with water electrolysis hydrogen production, hydrogen refueling, gas feeding and other functions.
In December 2021, the natural gas-hydrogen production facility successfully produced highly pure hydrogen, with the highest hydrogen purity up to 99.999% worldwide. In August 2022, the Phase I of the project was officially put into operation. It has filled the gap in the domestic industry and been reported with a feature story by CCTV news channel.

The North Cross Channel is a "horizontal" road of Shanghai’s "three vertical and three horizontal" skeleton network. In the early 1990s, constructing highway for the whole line was the plan. However, the huge size of the highway would tear apart the precious city ground space permanently, occupy public space and impact the surrounding community while the underground tunnel scheme had been stalled for years due to too many construction difficulties. In 2014, thanks to the continuous technological innovation in the field of construction, STEC succeeded in making the North Cross Channel an underground one. After commanding the use of large diameter shield and overcoming the building settlement challenge in Yangtze River and the Bund Tunnel, STEC now has the ability to ensure the safety and quality of the tunnel construction with the highest degree of difficulty and risk in the world. During the construction, STEC will push 15.59 meters’ diameter super large shield excavating from downtown Weining Road, continuously crossing the six metro tunnels in operation and 92 buildings in 6.4 kilometers, turning directions with minimum 500 meters’ radius, overcoming the tunnel lining structure, seal, construction risk and many other challenges.  STEC conquered the challenging underground traffic queue in spite of heavy underground traffics and buildings.

Located at the plant with a processing capacity of 500,000 m3/d on the west side of Zhuyuan, Bid ZYSQ 1.3 for Phase IV project of Zhuyuan Sewage Treatment Plant mainly include the following tasks: Construct a new AAO biological reaction tank with a capacity of 500,000 m³, a horizontal sedimentation tank and other buildings / structures; adopt the five-axis mixing pile, the composite steel pipe pile through PC construction method, the UHPC ultra-high performance concrete, and other emerging technologies. In this project, STEC applied the prefabrication and assembly technology on large scale and in large volume for the first time into the field of water utilities engineering. While ensuring the project quality and controlling the project risk, STEC also accumulated important experience for the engineering application of prefabrication technology into the future water utility industry.
Since the commencement, the project department has been awarded many honors, such as Shanghai Civilized Construction Site, Shanghai Green Model Construction Site, Shanghai Five-star Construction Site, Feature Project in Practical Achievements Competition among Major Projects in Shanghai, Excellent Team, etc.

The bid TP1.3 for initial rainwater regulation project of Taopu Sewage Treatment Plant mainly involves the rainwater collection pipeline system on the east side of Zhenjiang Village and at Zhenguang Village, which adopt the construction technologies of shield tunneling method and pipe jacking method.
All of the work shafts in this project are located at the intersections of municipal roads, and surrounded by many communities, busy commercial zones, large traffic flow and complex pipelines. In order to minimize the impact on surroundings, STEC optimized the construction technology and well structure. The project department actively connected with the local stakeholders, optimized the construction site and traffic organization, and substantially reduced the road area occupied by each shaft; the project department also canceled one pipe jacking shaft and two inspection shafts. That eases the surrounding traffic pressure and provides a reliable guarantee for orderly operation of Shanghai Municipality.

With a total length of 15.3 km and a water retention capacity of over 700,000 cubic meters, the deep drainage and storage pipeline system engineering of Suzhou River serves as a key link for Shanghai to systematically develop its in-deep underground space for the first time and to construct "sponge city". The capacity of drainage system along the Suzhou River can be promoted from once every year to once every five years after the whole project is completed. In this way, Shanghai can effectively address the once-in-a-century rainfall and basically eliminate the initial rainwater contamination along the Suzhou River. The Miaopu experimental section undertaken by STEC is as long as 1.61 km. The buried depth of the tunnel will be from 42 m to 60 m. In this experimental section, STEC constructed a round shaft foundation pit as deep as 56.6 m, the deepest foundation pit in soft soil in China. Ultra-deep shaft construction technology is becoming the benchmark for similar projects in the future. It will provide referential significance for the future development and utilization of underground space.

The 2021 comprehensive small watershed improvement project for clean eco-system in Huinan Town involves five aspects, namely river and lake system treatment, non-point source contamination control, comprehensive prevention and control of soil and water loss, ecological restoration, and living environment improvement. It mainly covers 80 reaches of river courses in Huinan Xiaohuangpu and Laogang River, 10 groups and 1 tributary in Yuandong, 5 groups and 1 tributary in Yuandong, etc.
The project team adopted water reoxygenation technology to aerate the river course. By improving the ecological environment in the local waters, the team restored the aerobic microbial community and thus ensured the survival of plankton and fish. By virtue of the biological seine technology and the principle of biological pollution control, plants were able to absorb nutrients in the water and to form biofilms to purify water. The team adopted biological seine as a framework to control the growth area of plants so as to avoid the secondary contamination caused by floating plants growing uncontrollably in the water. They employed a plant-floating bed technique, and planted aquatic plants, such as reeds, on the water surface. Those plants are effective in suppressing phytoplankton, improving water transparency, and lowering COD. While purifying water, they can create habitats for birds, fish and other living beings, and improving the landscape.
The comprehensive small watershed improvement project for clean eco-system works as an important basic project for the local government to implement the rural revitalization strategy. It is of great significance to prevent and control soil erosion, promote ecological restoration and protection of rivers and lakes, improve overall agricultural productivity, facilitate the development in green industry, and construct the rural development pattern of harmonious co-existence between man and nature.