A more reasonable and effective arrangement of the tunnel contour and saving the underground resources are key issues for the current city rail transport construction. We constructed tunnels from Shanghai Metro Line 8’s Huangxing Park Station to Shiguang Road Station, which is 2,688 meters long. The shield started from the Huangxing green area, passing through Xiangyin Road Station and Nenjiang Road Station, and ended in Kailu Road Station. We used the double circle shield, with a diameter of 6.52 meters and a width of 11.12 meters to complete the task. Introducing this shield for the first time helped save the underground space, limit the environmental impact and reduce the construction cost.

Relying upon STEC’s outstanding R&D team, as well as manufacturing and management capabilities in shield equipment, we had a huge breakthrough on the double circle shield construction without precedence in China. We conquered major technical difficulties like double circle shield tunnel ground deformation control, tunnel axis control and tube sheet assembly, etc. and formed a relatively complete double circle shield construction technology, laying a solid foundation for the comprehensive promotion of this shield construction method.

As the established enterprise in domestic tunnel construction field, STEC participated in constructing the first tunnel in China, Shanghai Dapu Road Tunnel, which was the first underwater tunnel as well as the first tunnel using shield method in China. During the construction, STEC applied the 10.2-meter diameter long grid extrusion shield which is an unprecedented invention fully conceived by our own country for tunnel construction. We have made a construction miracle, which is “digging a hole in the toufu”, building the first-ever cross-river tunnel and unfolding a new era of shield method in tunnel building. Dapu Road Tunnel ends the isolation between Puxi and Pudong in Shanghai, also accelerating the development in Pudong. This project was given the National Science Award in 1978.

As Shanghai began to assist counterpart city Dujiangyan for the disaster rehabilitation work, some major infrastructure’s construction got under way. After helping to build over 8,300 prefabricated houses in Mianyang city, STEC began to assist Dujiangyan City immediately, supporting the building of two sewage treatment plants in Mount Qingcheng, Dujiangyan City. Dujiangyan Sewage Treatment Plant, located in Mount Qingcheng world cultural heritage site, is the first sewage treatment project in a scenic spot in Chengdu. The project consists of A and B sewage plants, plant A located at the sixth group, Daguan Town in Mount Qingcheng, Dujiangyan City, covering an area of 39.27mu while plant B located at the first group, Puyang town in Dujiangyan city, covering an area of 63.98mu. The project consists of prefabrication, biological treatment structures, affiliated facilities and partial sewage treatment project. On the design of sewage plant, with the professional help of the STEC’s design institute, we chose the best alternative. In terms of the construction, we selected the most talented staff to construct the sewage treatment plant, which became a quality project in the disaster area, and won unanimous compliments. After the establishment of the sewage treatment plant in Mount Qingcheng, its capability of treating sewage was 40,000 tons per day. The sewage after treatment meets the national highest discharge standard: Class A, Level 1, which can not only be used in agricultural irrigation and daily water supply, but also in breeding fish. This project once won the Mongolia Construction Award in Shanghai.

7.5m x 10.4m Large Cross-Section Rectangular Pipe Jacking Machine was applied in the Zhengzhou Zhongzhou Avenue Pipe Jacking Tunnel. This pipe jacking machine can cut full cross section with the diameter of 10.4m X 7.5m, the size of the cross section is the largest in the field of pipe jacking machine at home and abroad. Many various new technologies were formed, including the rectangular development machine technology of cutting full cross section combination of central cutter and off-center multi-spindle cutter (1 cutter + 4 off-center multi-spindle cutters); the first application of wireless monitoring and the technology of modularized quick switch over, which is simple and safe, and has long communication distance and extendibility, reducing the switching time. After experts study on research results, the main technology standard of the project has achieved the international advanced level.

The 12th-Five-Year Plan of Shanghai Gas Development, based on the development of the 11th-five-year plan, puts forward strategic thoughts, clear objectives and detailed tasks of gas development in the city and proposes safeguard measures. Through effective implementation of the plan, by the end of the ‘12th Five- Year’ plan, the artificial coal gas would exit smoothly, the scale of natural gas supply would reach 10 billion cubic meters, with the proportion in the primary energy consumption structure rising to 11%, the supply scale of liquefied petroleum gas would maintain at around 400 thousand tons per year and all the city's gas users would have more than 15 days’ supply in emergencies. This plan is a programmatic document of developing the gas industry in the city during the ‘12th Five-Year’ plan. We established the position and characteristics of our city, we think and plan our development of the gas industry based on the nationwide environment and has formed two part project achievements- ‘Preliminary Study on “12th Five-Year” Plan in Shanghai Gas industry’ and ‘Shanghai Gas Development 12th Five-Year Plan’, which has an important guiding role in promoting the regional joint development, realizing interconnection of natural gas trunk pipeline network in Yangtze Delta Region and establishing a national natural gas trading center.

Shanghai Urban Construction Building is located at the intersection of Wanping Road and Longhua Road with total area of 50,153 square meters, the above-ground building area of 26,542 square meters and underground building area of 23,611 square meters, which include ten floors above the ground and three floors under the ground. Under the design principle of “scientific planning, sound function, pleasant environment and quality project”, the project employs the layout of “two hearts in one tube”, namely, laying out two independent and vertical transportation hubs in one building to meet the demands of utilizing them separately and wholly. On the design of facade, it combines the contrasting glass ribbon windows and stone materials to visually increase the height of the building and changes of shadow and light and to strengthen the modern and stylish effects of the architecture. As the first attempt to build 5O office building types, compared with 5A office building in the market, this project lay more emphasis on ecology, environmental protection and comfort. Besides adopting hard rock wool as green thermal insulation materials on the external brick walls, we adopted techniques such energy exchange between indoor exhaust air and fresh air, and energy saving and indoor comfort through the introduction of such new technologies as “VRV intelligent central air-conditioner”, “carbon dioxide, indoor temperature and humidity monitoring system”, “the recycling of air thermal energy and fresh air system with variable frequency”. In addition, the indoor headroom was maintained at 2.8m, much higher than the typical headroom of 2.5 meters to 2.6 meters in business office buildings, to create a spacious atmosphere. Moreover, roof gardens on the top floors, the outdoor green trails and green ornaments in the sunken square further demonstrate the concept of ecological office buildings.

Guangzhou Baiyun International Airport, a large-scale civil airport in Guangdong Provincial Capital Guangzhou, is one of the three largest airports in China. As one of the earliest companies taking part in the construction of the new Baiyun Airport, STEC has constructed many projects, including overhead bridges on airport’s highway, earthwork and drainage work in the flight area, China’s first taxibridge, tarmac, parking lot, and the third runway, witnessing the Baiyun Airport turning into one of three largest airports in China. Amongst which the flight area bridge project was honored the Tien-yow Jeme Civil Engineering Prize, National Green Building Innovation Award, and Shanghai Infrastructure Golden Prize. After more than ten years’ efforts, we’ve constructed several star projects at the airport, which largely improved the airport’s overall management abilities. The third runway project for the airport’s expansion, is built to the highest global standard, meeting 4F class aircraft usage specifications and able to accommodate the largest passenger aircraft model A380. The third runway was put into use in February, 2015, marking Guangzhou Baiyun International Airport the third domestic airport to have three runways, after Beijing and Shanghai.

As the availability of urban underground space for development becomes lesser, planning and construction of metro line is severely constrained. Construction on Shanghai Metro Line 9’s section from Xujiahui Station to Zhaojiabang Rd. Station is a case in point. The tunnel is 1,105 meters long. Due to the space limits, the super-shallow shield has to pass over the metro line 1 without affecting its operation. The depth to the top is only 4.2-5.0 meters. In order to control the risk, and minimize the environmental impact, STEC adopted two earth pressure balanced shields, with diameter of 6.34 meters, which we designed and manufactured ourselves. Our most experienced and skilled management and construction team, successfully completed the task, through precise calculation and analysis of the tunnel’s deformation characteristics and how the super-shallow shield passes over tunnels in service, without using auxiliary measures such as foundation reinforcement which may affect the nearby environment. After calculation, the maximum settlement above the Hengshan Road is only 25 millimeters, and the maximum uplift amount of Shanghai Metro Line 1 is only 2.3 millimeters, so we have controlled the tunnel axis effectively within ± 50 mm.

Relying on our more than 20 years’ experience in rail transport construction, we are able to construct tunnel projects which are extremely difficult and high risk. We are capable of helping the city achieve the “impossible” construction dream.

As the sole vital transportation tunnel beneath the HuangPu River during the World EXPO, South Xizang Road Tunnel is 5,319.5 meters in length. During the construction, the first national large-scale slurry shield” Xiong Ying Second” designed by STEC was put into use, changing the dilemma of our thorough dependence of large-scale tunnel shield machinery on foreign countries, opening up a brand new way of nationalization in this field, filling the void of domestic large-scale slurry manufacture. Meanwhile, the large-diameter slurry shield also successfully conquered the global difficulty of passing through small-diameter metro tunnel, Shanghai Metro Line 8, which is in operation. This achievement has accomplished the new record of construction in rail transport, and is honored as the model project of the appliance of new technologies in national architecture industry.

The latest 11.83m*7.27m rectangular shield machine developed by STEC was adopted on the first phase of Ningbo Metro Line 3, which has the largest cross section in the field at home and abroad. This kind of rectangular shield machine pioneered the integrated bidding mode of “scientific research-design-construction”. Relying on rich experience in designing and constructing shield machines, STEC’s scientific research team succeeded in developing the “Yangming” shield machine, which was named after the master of mind study——Wang Yangming. We have also formed a close and efficient cooperative relationship with Ningbo Rail Transport Group by carrying out the project.

During the development of the rectangular shield machine, STEC adopted several innovative technologies. One is modular lay-out technology including two X-shape-interested circular cutters with multiaxial eccentric cutter system, perfectly solving the previous dead zone problem of rectangular shield machine excavating sections, and also has obvious advantages in economy and safety. This is suitable for cutting various unconventional cross sections. The second one is a control method and an algorithm to avoid the interference of two X-shape-interested circular cutters when revolving, ensuring the safety of the two cutters in operation. That’s because the partial overlapping of two X-crossing cutters’ swivel trajectory on the working surface causes interference of the two cutters thereby losing control and causing damage. The third one is multi-DOF tunnel plate assembling technology with column building functionality, implementing optimized path planning and high precision, collision-free tracking with compound motion technology, breeding a new solution for automatic tunnel place delivery processing. The fourth one is adopting the automatic articulated technology of heavy quasi-rectangular shield machine shape curve, which can make a R300m turn. There is no corresponding case in the rectangular shield machine field at home and abroad.

In the process of adjusting the energy structure in our country, one of the important measures is to speed up the development and utilization of LNG. As the forerunner of the LNG industry in China, STEC has undertook design and part of the construction work in the first, second and third phase of Hainan CNPC Shennan LNG storage project. The first phase includes two 20-thousand-cubic-meter single containment tanks and a 40-thousand-cubic-meter quay with annual transportation scale of 800 thousand tons. The second phase includes expanding one 80-thousand-cubic-meter all-inclusive storage tank with annual transportation scale of 1.2 million tons. The third phase includes expanding one 80-thousand-cubic-meter all-inclusive storage tank with annual transportation scale of 2 million tons. In terms of the design, STEC broke through the shackles of traditional pipeline design by entering into the high end area of low temperature refrigeration technology for the first time, which has far-reaching significance in accelerating the development of new energy and other emerging industries, such as LNG. As the supporting project of Hainan gasification and the first domestic LNG secondary receiving station, Hainan CNPC Shennan LNG storage project can receive, store and transport LNG. The natural gas stored is connected with natural gas pipeline network around the island of Hainan Province through transportation and pipeline distribution. This can not only thoroughly solve the ‘gas panic’ problem in Hainan but also distribute natural gas to the users inside and outside Hainan Province and therefore balance the upstream supply and the downstream market demand.

The Information Management System of Shanghai Hongqiao Integrated Transport Hub collates information about several transportations such as airport, high speed train, maglev, subway, highway, public transportation and taxi. STEC established a mathematical model to analyze and evaluate the passenger flow in the hub and a smart transport management system, which helped the hub to collect the transportation information from surrounding area, monitor, control signals, and direct cars and people. An all-round transport management system is informative, detailed, scientific, automatic and efficient throughout the whole process. As Asia’s largest transportation hub, Hongqiao Integrated Transport Hub sets an example for the information management system, which was given the third prize of Shanghai Scientific Progress Awards and first prize of a similar awards organized by China Highway and Transportation Society.