Tianjin Yujiabao financial district is located in the core area of Tianjin Binhai New District. It’s the third major financial district in China following Shenzhen Futian and Pudong Lujiazui. B1 is a commercial street, B2 and B3 are metro line B2 and B3’s interchange area. We take charge of Tianjin Yujiabao initial Lot 9 underground space’s preliminary design, construction drawing design, the peninsula ditch, underground space design of 3.86 square kilometers, and the first phase of the shared ditch project. In the overall design of underground space, we reserved space in advance for the surrounding basements connection to ensure the sustainable development of the region. Based on the principal of developing surface and underground integration, we set rail transport as the core objective and formed a three-dimensional framework to establish an integrated commercial system, enhancing the region’s value. When designing the metro line’s entrance, we tried upgrading the design method twice to create the environment, and to improve the quality. By constructing semi-sinking platform, the atrium’s underground space is designed with full natural ventilation and lighting. After the completion of the shared ditch, the underground pipelines of the financial district can be kept centralized in the "shared ditch," and completely reversed the past situation of messy pipelines everywhere.

As the first national enterprise building large-scale public roads using an 11-meter shield for construction, STEC applies the large-diameter shield construction technology to rail transport, aimed to meet the clients’ need to shorten tunnel construction period and save the underground space. The tunnel, starting from East Liuzhou Rd to Shang Yuan Gate of Nanjing Metro Line 3, is 3353.94 meters long. We construct the single underground railway tunnel with dual carriageway and inner structure at the same time, with shield’s diameter reaching 11.57 meters. Because of the expansion of the shield’s diameter, the shield is able to lay two tracks at the same time. This reduces the construction costs and time significantly and saves limited urban underground space compared to traditional 6-meter-diameter shields. The metro has to go through the Yangtze River, where the geologic situation is complicated, as there are a lot of gravels, fracture zones and layers at the bottom of the river. However, due to our rich experience in previous large road tunnels, we conquered all the difficulties and successfully built a single underground railway tunnel with dual carriageway using large-diameter shield across the Yangtze River in China for the first time.

Shanghai Metro Century Avenue Station Project is located in Shanghai Pudong New Area, at the intersection of Century Avenue, Dongfang Road, and Zhangyang Road, with floor area of 36,300 square meters. The Century Avenue Transfer hub is an efficient integrated and resource sharing station. The height of four stations formed the shape of the Chinese character "丰". In lieu of the traditional way of transfer, a "zero transfer hub" was achieved. This innovation not only reduces transfer time and distance, but also greatly improved passengers’ transit experience. Consolidating the surrounding environment conditions during construction, we first built separately then combined all the things together. We utilized the multi-door-shaped anti-floating beam to ensure the structure stability of the station. When constructing metro line 9 station’s foundation pit, we excavated section by section and adopted a steel-concrete supporting system to prevent line 2 and 4 stations from deforming, which ensured normal operation of metro stations. The project’s technical innovations not only fulfilled the lacking part of large-scale rail transit transfer station expansion project, but also accumulated much experience in large-scale construction projects. The success of the project bears testament to our construction techniques in underground expansion reaching an international level. Our research achievements can be widely promoted in the entire underground construction industry.

Shanghai Electronic Toll Collection Project is a major civil engineering project. By using this toll system, cars can go through the gate in less than two seconds, five to ten times quicker than paying fees manually. STEC leads the industry in designing smart transport. After Shanghai government issued a paper on developing the highway ETC system in 2006, STEC is proud to be invited to design the 1st, 2nd and 3rd phases of the ETC project, providing comprehensive plans for the full application of the ETC system, and also assisting Shanghai to lead other cities in developing smart transport. We suggest the ETC project having toll charging and clearing center, card center, customer service system, toll charging branches, toll gate system, driveway system and car OBU system. We’ve also proposed an innovative ETC technique plan. That is, installing OBU with a single stored value card to let a car go through quickly on crowded roads to meet some cities’ requirements of high speed. Using traffic micro simulation software PARAMICS can optimize the setting of ETC driveways, railings, and card readers. With all these, crowded roads can be eased and clearance speed can be increased. After the 1st and 2nd phase construction, 190 ETC driveways were set up in 22 major toll gates and 64 subsidiary toll gates in Shanghai. After the 3rd phase, 79 more were installed, covering all the highway toll gates inside Shanghai. Cars can now pass through the Yangtze Delta Region (Shanghai, Jiangsu, Zhejiang, Anhui, Jiangxi and Fujian) without stopping, by using the ETC system.

Shanghai Zhuyuan No.1 Sewage Treatment Plant is located inside Zhuyuan Sewage Treatment Plant in Gaodong Town, Pudong New District, covering an area of 500 mu. It is an extension project of the first phase project of Suzhou Creek’s integrated treatment, mainly dealing with domestic sewage and combined sewage in Suzhou Creek, Putuo, Changning, Jing’an, Zhabei as well as partial areas in Huangpu, Hongkou, Yangpu, Pudong and Waigaoqiao, benefiting approximately 2.35 million people. The Shanghai Zhuyuan No.1 Sewage Plant discharges treated water flow into Yangtze River, twice the amount of Suzhou Creek, designed to treat 1.7 million tons of sewage per day, accounting for nearly one third of the whole city’s use. It was the largest modernized sewage treatment plant in Asia upon its completion. In 2004 its treatment of sewage was level 1 and in 2010 it upgraded to level 2 which meant biological treatment. After the establishment of this plant, the entire water environment of the city was greatly improved, and the plant not only played an important role in sewage treatment, water quality maintanence and ecological balance, but also was instrumental in improving the investment environment in Pudong New District and promoting the sustainable development of Pudong’s regional economy.

Shanghai Pudong Foreshore Natural Gas Decentralized Energy Project is located in foreshore area 56-01 plot, along Huangpu River’s south extension. The total construction area is 20,750 square meters, with 10,800 square meters above the ground and 9,950 square meters under the ground. This super large urban complex of commerce and residence adopts the natural gas decentralized energy system in an area of 420,000 square meters. Compared to the normal centralized system, this decentralized system is more energy-efficient, cleaner, more economical and safer. STEC has contracted this project and innovatively used natural gas as fuel. With the help of two 345 kilowatts gas internal combustion engine generating sets and their supporting facilities and one 1,800 kilowatts domestic gas turbine demonstration platform, we provided cooling and heating air conditioner with high quality and reliability near the load center, through the new energy supply technologies such as the combined cooling, heating and power system as well as energy storage. The project’s comprehensive energy utilization rate reaches more than 70%. Compared with the traditional cold and heat source and electric energy dispersion, the CCHP technology of foreshore energy stations can greatly reduce energy consumption and emissions of carbon dioxide and sulfur dioxide. In the process of developing the foreshore into ’24-hour City’, this project not only brings closer the foreshore area and international financial cities like New York and London, but also develops a more environmentally friendly area.

The earth pressure balance shield “Pioneer” is the 863^rd project of the 10^th five year plan in our country, which was constructed by STEC. We developed the first underground shield in China with autonomous intellectual property right in 2003. This shield’s outer diameter is 6.34 meters, and the largest thrust is 35200KN. Its excavating speed reaches to 6 cm/min. In October 2004, this shield was applied to the tunnel construction of Shanghai Metro Line 2’s Gubei Road to Zhongshan park area. In June 2005, the first tunneling was finished. The “Pioneer” created a new record of shield excavation in the world, and set a record of excavating 38.4 meters per day and 566.4 meters per month compared with the fast record of 31.4 meters per day and 531 meters per month at that time. The “Pioneer” reversed the situation that foreign shield ruled the shield technology, and its main technical standards attained the advanced level of foreign shields. Therefore, it acquired many awards such as Shanghai Science and Technology Progress Award, Chinese Major Creation Award and silver prize of Chinese Industrial Exposition. 22 “Pioneer” were ordered in 2006, boosting the domestic shield market greatly and also achieving quantum leap development of shield in STEC. “Pioneer” has been used to construct metro tunnels in Shanghai, Zhengzhou, Hangzhou, Nanjing and Wuhan etc.

Jiangsu Nanjing Garbage Incineration Power Plant in North Venous Industrial Park is located in Pukou District in Nanjing and is called ‘Twin Plants’, together with Jiangnan Garbage Incineration Power Plant constructed during the same period. With the widespread public concern over waste incineration flue gas treatment, we innovatively adopted the flue gas purification process of ‘semi dry + dry + activated carbon injection + bag filter +SNCR’. For the leachate and other waste water, we adopted ‘slag pretreatment + anaerobic +MBR+RO’ process. Slag, which is waste incineration product, belongs to general solid waste and all the waste generated by waste incineration can achieve safe disposal. As a key project in infrastructure construction in Nanjing city, this is an important livelihood project that can promote integration of urban and rural life garbage disposal in the city and achieve zero harm, quantity reduction and resource fulfillment of domestic garbage. Thus, this project is crucial to improving the living environment of urban and rural areas and the overall standard of the whole city. After the completion, with daily treatment of municipal solid waste reaching 2,000 tons, Jiangbei Garbage Incineration Power Plant in Venous Industrial Park can help Nanjing digest nearly 1/3 of the domestic garbage.

Shanghai Hongyuan Prime International Cultural City Project, an urban complex project integrating first-rate office building, hotel, exhibition, commerce and entertainment activities, is situated at the 02 section of the first phase in Shanghai Hongqiao central business district and the total area occupies 92,133 square meters. The project contains 13 buildings above the ground, the gross floor area occupying 256,323 square meters and the buildings under the ground divided into three-floor basements, the gross floor area underground occupying 272,074 square meters. According to the construction requirement of low-carbon emission, all the materials shall meet relevant requirements and all the roofs in the project will undergo greenery works. Meanwhile, the project will carry out the supply of combined cooling, heating and power in all areas, the integrated utilization rate of energy resources will reach over 80%, more than double the utilization rate of traditional energy supply. In order to raise underground activity rate, commercial value and utilization rate, the project attaches great importance to the standardization of above and underground commerce, creating a favorable commercial environment and improving the human traffic and commercial value underground, and to forge a more comfortable and safer underground district. In addition, there are connecting underground paths whereby it is able to connect with Hongqiao traffic hub, International Convention Center project and other core commercial areas to achieve “Broad Connection and Grand Development” and to form a complete underground network. During the construction, we built an integrated management platform including staff management, construction site monitoring, multi-tower management and foundation monitoring by means of BIM management system to digitalize, visualize and grid the personnel management and construction process, to improve the dynamic construction management level and to ensure safe, quality and efficient progress and to gather experience for similar large-scale complex projects. After the project is completed, it will blend in with other complex projects in the whole central area to grow into a multi-functional, fast traffic, pleasant space and ecologically effective business district with immense power of growth and attractiveness.

Zhengzhou Zhongzhou Avenue Tunnel is the longitudinal axis of the city’s downtown expressway system. It has the biggest section of a rectangular pipe jacking tunnel in the world. Since 1999, STEC has put rectangular pipe jacking technology into tunnel construction. The conduit jacking construction technology has a higher utilization rate of space with shallow overburden and low construction cost. These advantages make conduit jacking construction technology favorable for underground construction in big cities.

The construction of Zhengzhou Zhongzhou Avenue Tunnel consists of four rectangular pipe jacking tunnels through the use of a large section pipe jacking machine (10.4 m * 7.5 M). STEC managed to finish the first 110 meters long extra large section rectangular pipe jacking in China without disturbing the ground transportation, underground lines or pipes. The land subsidence was controlled in less than 3 centimeters. At the same time, in view of the special section structure of conduit jacking, the tunnel has a 35% higher utilization rate of space than a round section tunnel, reducing the depth of tunnel burial.

Till dare, among the finished rectangular pipe jacking tunnels, the biggest width is 6 meters like a pavement. STEC’s domestically designed 10 meters’ width tunnel is the first example in the world. It subverted the concept of city road design and construction. It is poised to become one of the best options of city’s underground transportation and tunnel net construction.

Zhuhai Modern tram is the first tramway using ground-level power supply system in China, which has zero emission during operation. The first phase project of Zhuhai modern tram line 1, designed by STEC, stretches 8.7 kilometers. All 14 stations are above the ground, and the line has one tram base. The modern trams are 100% low-floor, with steel wheel and steel rail. The whole line uses catenary-free ground-level power supply system. STEC also adopts environmental-friendly lighting system, which gradually adjust light to become brighter when the tram reaches the station, and the lighting intensity differs on holidays and working days. In addition, in order to make full use of the tram as a major public transport, STEC offers a series of value-added services for the city. That includes 10 shuttle buses’ routes and transportation plan which can serve more than 110,000 people, as the tram network is not fully developed and there are only very limited connections with existing public transports in the first phase project of Zhuhai Modern tram line 1. The first phase of the tram involve dedicated lane rights, before the traffic flow matures and early stage transportation stabilizes, some lanes will be free, while other lanes are crowded. STEC analyzed the tram lane’s characteristics, accessible time and numbers, and then set limited conditions for cars to share the tramway. That means, trams use the first-phase tramway exclusively, but at the intersections, some of the roads are shared. On the basis of intersection traffic organizing principle, STEC offered signal control strategies and intersection signal control solutions to ensure the signal control are embedded in the design. Our study on the tram is gradually expanded to more routes and functions. We also drafted guidelines to help trams become the major transport mode in the city.

As a large-scale comprehensive project combining civil engineering, installation and electricity, Shanghai Middle Yanggao Road Power Tunnel Project is our country’s largest power tunnel. It is also a landscape engineering project to place all overhead high voltage lines under the ground in Pudong. After the completion, the ‘cobweb’ in the air on the south side of Shanghai Middle Yanggao Road completely disappeared. Middle Yanggao Road Power Tunnel was 3,180 meters in length and was divided into two parts: the tunnel and working well construction, among which the tunnel is about 2,800 meters in length along with cables of 22 million volts, which mainly supplies the People's Square and Lujiazui area. During the tunnel construction, we adopted the trenchless pipe jacking technology, dividing the construction into nine sections, among which 4 sections crossing under the road and 3 sections respectively crossing under East Yan’an Road, Luoshan Road Overpass and raw water box culvert. Top section construction imposes high requirements on environment deformation control. As there was no mature construction experience in ‘large-caliber, long-distance and hyperbolically curved pipe jacking underground butting construction’, construction is of great difficulty. The tunnel can allow small maintenance vehicles to enter. Therefore, if there is a power failure, maintenance will not affect ground traffic on Middle Yanggao Road. This makes line maintenance of the high voltage cable and daily maintenance more convenient. In addition, the monitoring equipment in the tunnel and the card access system into and out of the tunnel can prevent theft of the buried cables and make the power line safer.