Guangzhou metro shield construction "hengdun mud" technology won the first prize of guangdong province science and technology progress

On March 27th, in the guangdong province science and technology innovation conference held in the pearl island hotel, the scientific research project "research on the key technology of shield tunneling" auxiliary belt pressing into the warehouse, hosted by guangzhou metro group and undertaken by guangzhou rail transit construction supervision co., LTD., won the first prize of guangdong province science and technology progress award.

The technology in the identification of scientific and technological achievements is considered to fill the gaps international technology, reached the international leading level, and was seven tiger spoke highly of the Chinese academy of engineering of money: "' HengDun mud technology reduces the shield construction belt press it into a storehouse of construction risk, greatly improved the level of shield engineering technology in China, the development of shield construction technology a landmark".

In the 1990 s, bold attempt in urban rail transit construction in guangzhou metro, take the lead in the introduction of shield method in the complex formation, after digestion and absorption of shield technology, improvement and innovation, through more than 30 were nearly 100 km, the practice of shield tunnel, created the theory of compound formation of shield construction technology and application system, and led to the leapfrog development of shield project in China. Today, China has become the world's largest shield tunneling country, with more than 1,500 machines and more than 1,000 km of shield tunnels completed annually.

However, due to the complexity of complex stratum geology and the limitations of today's industry technology, manual opening inspection, tool replacement, tool repair is a must in many cases procedures or links. So far, the traditional opening techniques used at home and abroad are limited to varying degrees, such as high cost, limited by the surface environment, and short excavation surface stabilization time. In particular, under the special working conditions of rivers or structures, the traditional reinforcement method is limited, and opening with pressure is a necessary and helpless choice.

The key of the technology of opening the bunker with pressure is to ensure the effect of retaining air pressure of the mud film. Once air leakage occurs, the excavation surface will lose stability, the ground will collapse, the tunnel will be under the river, and the river will flood the shield machine and the tunnel, leading to major safety accidents. How to ensure the security of warehouse opening? How to reduce risk? How to improve efficiency?" This is a worldwide problem in the field of shield tunneling, which has puzzled zhu weibin and his team, the chief founder of the technical system of composite stratum shield tunneling construction, for more than 20 years.

The difficulty is the direction, the difficulty is also the power. ZhuWeiBin lead project team to attack, use the weekend, holidays warehouse, making a test site, soil, under the shield in more than 20 years of engineering practice, struggled, perseverance, work wholeheartedly, the editor in chief of the shield method and open air pressure operating technical specification ", on the basis of the formation of "shield construction HengDun mud auxiliary belt press it into a storehouse of complete sets of technology", from the aspects of materials, equipment and processes, the breakthrough of mud membrane, low viscosity, and protecting the holding time is short, excavation face unstable bottleneck, conquer the shield homework open high risk, long investment big, the time limit for a project technical problems, such as greatly improved with the degree of safety and efficiency of open positions.

At present, "HengDun mud" has in guangzhou, fuzhou, lanzhou, xiamen and other 13 cities, the difficulties in 42 engineering, more than 100 times of shield successful application in the open under pressure to save costs about $135 million, to the success of a number of subway engineering bottleneck conquer armband, its create comprehensive social and economic benefits are very significant, its application prospect is immeasurable.