The comprehensive pipe corridor, the full name of which is the "underground urban pipeline comprehensive corridor", is to build a tunnel space under the city, integrating various pipelines such as municipal, electricity, communications, gas, water supply and drainage. This tunnel space is equipped with dedicated access openings, hoisting openings and monitoring systems for unified planning, design, construction and management.
The construction of the comprehensive pipe gallery can optimize the use of urban underground space, improve the operation efficiency and safety of pipelines, and reduce the impact of pipeline maintenance and overhaul on urban traffic and residents' lives. The types of comprehensive pipe corridors include trunk comprehensive pipe corridors and branch comprehensive pipe corridors, in which the trunk comprehensive pipe gallery is responsible for providing distribution services to the branch comprehensive pipe corridor. The pipelines that can be contained by this system include communications, cable television, electricity, gas, tap water, etc., and some trunk comprehensive pipe corridors also include rain and sewage systems. The comprehensive pipe gallery has the characteristics of large structural section size, deep soil covering, stable system and large conveying capacity, and has a high degree of safety, but the maintenance and testing requirements are high.
The future of the comprehensive pipe galleryMarket.
The status quo of China's comprehensive pipe corridor shows a trend of rapid development. With the acceleration of the urbanization process, the market of the urban comprehensive pipe gallery industry has gradually grown, and more than 100 cities in the country plan to carry out the construction of the comprehensive pipe corridor, with a market size of trillions.
Underground comprehensive pipe gallery construction market space is huge, without calculating the cost of demolition and other costs, assuming that the underground comprehensive pipe gallery investment per kilometer is 55 million yuan (calculated according to Changsha City planning), now to Baotou City planning as an example, Baotou City plans to build 100 kilometers of underground pipe gallery, assuming that the average mileage of the underground pipe gallery in 334 prefecture-level administrative regions can reach 100 kilometers, the total investment will reach 18 trillion yuan.
At present, the construction of China's urban comprehensive pipe gallery is in the stage of orderly advancement, and the first department has successively introduced various policies, requiring all localities to prepare more reasonable pipe corridor planning according to the actual local situation, formulate a more feasible construction plan, and promote the healthy and orderly development of China's urban underground pipe gallery industry. In the future, with the continuous advancement of urbanization and the increase in the demand for the utilization of urban underground space, the construction and application of comprehensive pipe corridors will become more and more extensive.
The application of comprehensive pipe gallery at home and abroad
The comprehensive pipe gallery has been applied in many cities in China, including Beijing, Shanghai, Shenzhen, Suzhou, Shenyang, Qingdao, Chengdu and many other cities. These cities have invested a lot of money and energy in the construction of comprehensive pipe corridors to improve the state of urban infrastructure and improve the level of urban management and services.
Beijing Winter Olympics Yanqing competition area underground comprehensive pipe gallery
For example, Beijing has built a comprehensive pipe gallery in the Yanqing competition area of the Winter Olympics, which is the first time that China has built a comprehensive pipe gallery in a mountain tunnel. In addition, the large-scale residential community comprehensive pipe gallery in Shanghai Songjiang is also one of the largest comprehensive pipe gallery pilots in the country. The development of foreign comprehensive pipe corridors is relatively mature, which can be traced back to the mid-19th century, such as the underground drainage system in Paris, France. Subsequently, the United Kingdom, Germany, Russia and other countries also began to build comprehensive pipe corridors.
Underground drainage system in Paris.
In Europe, the common ditch is a common way to use underground space, as early as 1833, when Paris, France began to systematically plan the drainage network, the construction of the common ditch began. In 1861 it was built in London, England, with a width of 12 feet and a height of 76 feet of common ditch. In 1890, Germany also began to build a common ditch in Hamburg. The Swedish city of Stockholm has a common ditch 30 kilometers underground. There are 130 kilometers of underground common ditches in Moscow, except for gas pipes, there are various pipelines, but the cross-section is small (2mx2m), and the internal ventilation conditions are also poor. A large water supply system in New York City, USA, entirely arranged in a common ditch in an underground rock formation. The cities of Toronto and Montreal in Canada also have well-developed underground common ditch systems.
Japan"Common groove"
Japan is currently one of the most developed countries in the construction of underground pipe gallery (called "common ditch" in Japan). Japan has a small land area and a shortage of urban land, so more attention is paid to the comprehensive use of underground space. Japan's common ditch project originated from the Japanese Ministry of Internal Affairs' inspection of the European common ditch in 1911, and the name "common ditch" first appeared in the documents of Japan** in 1919, and planned to build a common ditch with a total length of about 509 kilometers in the capital Tokyo. However, due to the huge cost issues, the plan was not implemented. In 1923, Japan had the Kanto Great **, Japan ** re-recognized the importance of the common ditch, as a part of the Japanese reconstruction plan at that time, Japan in Kudanzaka, Yaesu, Hamamatsu Kinza began the pilot construction of the common ditch, the electricity, water supply and gas pipelines were laid in the common ditch. However, due to the huge difficulty of coordination between enterprises such as communications and electric power, the construction of common ditch was once again shelved. In 1926, in response to the large-scale damage to the pipeline caused by Japan, the reconstruction plan re-planned and built the underground comprehensive pipe gallery from the perspective of disaster prevention. In 1963, Japan promulgated the "Law on Special Measures for the Construction of Common Ditches", which solved the key issues such as the apportionment of construction funds and construction technology, and revised and improved it many times with the development of urban construction. 
At present, Japan has built an underground pipe gallery system covering the whole country, which is divided into three categories: trunk common ditch, branch line user pipe common ditch and wire common ditch. Common duct for trunk lines and utility supply pipelines are mainly laid on arterial roads in major cities such as Tokyo and Osaka and new urban areas, mainly to reduce repeated road excavation, alleviate road congestion caused by road excavation construction, and secure disaster prevention space. Common duct for power cables mainly solves the impact of overhead lines on the urban landscape and beautifies the urban landscape, and has been popularized and popularized throughout Japan. The efficient use of urban underground space has been realized. At the same time, Japan has also strengthened the maintenance and management of underground pipe corridors to ensure its safe and stable operation.
Advantages and obstacles of the comprehensive pipe gallery.
1.Avoid the "spider web" phenomenon over the city and improve the city's appearance.
2.It is convenient for the laying, addition and reduction, maintenance and daily management of various pipelines, and reduces the cost of multiple road reconstruction and engineering pipeline maintenance.
3.Maintain the integrity of the road surface, avoid the impact and interference caused by urban traffic and residents' travel, and ensure the integrity and smoothness of the road.
4.Make effective use of urban underground space and save urban land.
5.Enhance the city's ability to resist earthquakes and disasters, and avoid the occurrence of secondary disasters such as broken and dumped power poles.
6.It is high-tech, equipped with advanced all-weather intelligent monitoring and management system and strong emergency repair system to ensure all-round monitoring, uninterrupted operation information feedback and low-cost and high-efficiency maintenance and management effect in the pipe gallery.
7.Environmentally friendly and less nuisance. After the municipal pipeline enters the corridor, it realizes one-time centralized laying, and there is no need to repeat the construction of the road, which is beneficial to urban environmental protection and energy conservation and emission reduction.
8.It can realize investment diversification, encourage the diversification of investment subjects, and expand from the past to the form of enterprise investment, social forces and multi-faceted joint investment and common income.
1.The period to achieve economic and social benefits is long.
2.High construction costs.
3.It is difficult to coordinate the entry of pipeline units into the corridor.
Summary and outlook.
Although the construction cost of the comprehensive pipe corridor is high, in the long run, it can reduce the cost of urban operation and maintenance, improve the overall efficiency of the city, avoid the impact and interference caused by urban traffic and residents' travel, save the comprehensive cost of society, improve the environmental quality of the city, and enhance the city's earthquake resistance and disaster resistance. In addition, with the acceleration of urbanization and the use of urban underground space, more and more attention has been paid to the construction of comprehensive pipe corridors, which will also become one of the trends of urban infrastructure construction in the future. However, in practice, it is also necessary to evaluate and plan according to the actual situation of each city.