The Great Wall is the spiritual symbol of the Chinese nation and the largest and most widely distributed cultural heritage in China. Among the 15 provinces, autonomous regions and municipalities directly under the Central Government where the Great Wall is distributed in China, the Beijing section of the Great Wall is well preserved, but the maintenance is more difficult than expected.

Beijing sets up special funds every year.

　　Emergency rescue and reinforcement of 10 sections of the Great Wall

　　The Great Wall in Beijing was first built in the Northern Qi Dynasty and was built on a large scale in the Ming Dynasty. In history, it was well-guarded and built for guarding the capital, which is the essence of the Great Wall in China. In terms of scope, the Great Wall of Beijing covers six districts, including Pinggu District, Miyun District, Huairou District, Yanqing District, Changping District and Mentougou District, with a total length of 520.77 kilometers.

　　Since 2000, nearly 100 Great Wall protection projects have been carried out in Beijing, including a demonstration protection project represented by the famous dangerous section of the Great Wall, Jiankou Great Wall. In 2019, the "Beijing Great Wall Cultural Belt Protection and Development Plan (2018-2035)" was announced, and the protection and repair of the Great Wall in Beijing was further strengthened.

　　According to the plan, by 2035, by means of emergency rescue and routine maintenance, Beijing will realize that the whole line of the Great Wall itself and its carrier is free from danger. In order to achieve this goal, starting from 2019, Beijing has steadily promoted 10 Great Wall rescue and reinforcement projects every year.

　　Since August this year, the rescue and reinforcement projects of the Great Wall in Beijing in 2021 have started one after another. In late October, the construction also came to an end. Among them, the construction of the Great Wall in Huairou section this year has all ended — — All four municipal projects have been completed, and the fourth phase of the Jiankou Great Wall renovation project has also completed this year’s task.

　　From Jiankou Pass to Zhengbei Building

　　The eastern section of Jiankou Great Wall has been penetrated.

　　This year’s emergency maintenance project of the Huairou section of the Great Wall runs through the most steep part of the eastern section of the Jiankou Great Wall.

　　The Great Wall of Wan Li extends east and west in the spectacular mountains north of Beijing. The Great Wall in Huairou section of Beijing is an important part of it. It is connected to Xiaoshuiyu in Miyun District in the east and Dazhuangke in Yanqing District in the west, with a total length of 65.4 kilometers. Now, every enemy building (platform) in the long section of the city has a number, which increases from No.1 to No.284 from east to west.

　　The Jiankou Great Wall is a part of Huairou Great Wall, which starts from No.122 watchtower of Zhengbei Building in the east and is connected with Mutianyu Great Wall. Northwest to the "Nine Eyes Building" No.169 enemy building, bordering the Great Wall section of Yanqing District. Because of the steep terrain, the Jiankou Great Wall is considered as "one of the most dangerous sections of the Great Wall in China".

　　Taking the "Jiankou Pass" between No.131 and No.132 enemy platforms as the node, the Jiankou Great Wall is divided into two parts in the maintenance project.

　　Among the four municipal projects in Huairou this year, the side wall rescue and reinforcement project between No.130 and No.131 watchtowers is located in the eastern section of Jiankou Great Wall. The elevation of this section of side wall gradually rises from west to east, and the position is steep and steep.

　　The focus of this construction is mainly on the severely damaged floor tiles. According to Zhang Tong, director of Huairou District Cultural Relics Institute, in order to protect the structural stability of cultural relics and prevent them from further collapse, the rescue and reinforcement project has taken measures such as laying bricks or stones to reinforce the parts that affect the structural safety, cleaning and stabilizing them.

　　The construction environment is steep and the construction period is short, which increases many difficulties for emergency rescue construction. Water is needed for construction. However, due to the serious water shortage area, the construction team needs to lay a pipeline with the longest length of nearly 1,000 meters, borrow local 300-meter deep wells to lift water, use diesel to generate alpine pumps, and then lift the water to the top of the mountain through the pumping station. At the end of October every year, the temperature in mountainous areas drops sharply, and the water pipes will face the problem of freezing, so the repair work of the Great Wall will be forced to stop.

　　The cold air came earlier this year. In mid-October, the temperature on the mountain has fallen below freezing point. In order to finish before this, the side wall construction has specially increased manpower. According to Cheng Yongmao, technical director of emergency engineering, the workers are working overtime, going up the mountain at 6: 30 every morning and working until about 5: 30 in the afternoon. "If you go down the mountain later, it will be dark."

　　The rescue and reinforcement project between No.130 and No.131 watchtowers was completed on October 20th. This side wall is connected with the third phase repair section of Jiankou Great Wall. The completion of emergency rescue and reinforcement means that the arrow buckles the eastern section of the Great Wall — — The arrow buckle has been closed to the north building, and the emergency repair has been completed.

　　The fourth phase is affected by continuous precipitation.

　　At present, the clean-up work is completed.

　　In synchronization with the 10 rescue and reinforcement projects of the Great Wall in Beijing this year, on August 13th, the fourth renovation project of the Jiankou Great Wall was officially started, and it is planned to be completed before ice period next year. The renovation scope starts from the well-known "Beijing Knot" (No.154 enemy tower) and goes north to No.162 enemy tower, involving a total of 8 enemy towers (towers).

　　This section of the Great Wall is a masonry structure, with arrow holes on both sides of the battlements, and it is relatively well preserved as a whole. However, the whole section of the wall is overgrown with trees, some walls collapse, the ground is scattered and broken, and the watchtower collapses to varying degrees. The emergency repair mainly includes cleaning up sundries, unblocked drainage, and building collapsed sections. During the construction process, the materials will be transported by agricultural vehicles and mules, and finally they will be carried up the mountain manually.

　　Since the start of construction, the rainfall in Beijing has been constant, which has added more difficulties to the construction. "The construction site is far from the material yard, the road is muddy, and the materials can’t be transported." Cheng Yongmao described it. Therefore, the fourth phase of the project has mainly completed the preliminary cleaning work, and will resume construction after thawing next spring. However, Cheng Yongmao estimates that the fourth phase of the project can be completed on time next year.

　　Before the start of the fourth phase, the repair work of the Jiankou Great Wall has been completed about 3,200 meters. According to calculation, after the completion of the fourth phase of the project with a length of 1678 meters, the repair progress of the Jiankou Great Wall will be nearly half completed.

　　However, the current repair work is mainly an "emergency" for dangerous situations, and it still does not have the conditions for opening to the outside world after completion.

　　"minimum intervention, archaeology first"

　　Respect the traces left by time

　　According to experts, after years of protection and maintenance practice, people have gradually formed the concept of Great Wall protection. In 2014, after National Cultural Heritage Administration issued the Guiding Opinions on the Protection and Maintenance of the Great Wall, these protection principles were further standardized and implemented.

　　In the process of this emergency repair, the construction workers always adhere to the principles of "minimum intervention" and "no change in the original state of cultural relics": in order to maintain the original style, the original old masonry should be used as much as possible for repair; In order to delay the weathering damage of the bottom brick, the vegetation that can be preserved is not easily moved. Zhang Tong said: "After the danger is removed, the structure of the Great Wall will be more stable, but the appearance of the damage caused by wind and frost will not change."

　　Such rescue work has indeed stood the test of years. No.202 watchtower and No.204 gate closure are the emergency and reinforcement projects of the Great Wall in Beijing in 2019. At that time, in addition to mending and strengthening the wall, the construction workers also built an extra low wall to prevent flash floods from directly washing the wall in rainy season. In the continuous rainfall in Beijing in July this year, there was no new danger in this paragraph. Similarly, with the promotion of the renovation project of Jiankou Great Wall, the safety factor of Jiankou Great Wall, which is known as "danger", has gradually improved.

　　The concept of "archaeology first" is gradually integrated into the daily work of emergency repair. In this year’s rescue and reinforcement project, a number of scattered cultural relics, such as roof ridge beasts, launching grates and the bottom of blue and white porcelain bowls, have been cleaned up one after another.

　　From the second phase of the renovation project of the Jiankou Great Wall, the staff added an archaeological cleaning link before the construction, and used archaeological methods to clean up the Great Wall itself and the "one meter and one meter" on both sides to ensure that the scattered cultural relics can be more truly and completely protected. Relevant experts believe that this is an important progress in the concept of protecting the cultural heritage of the Great Wall.

　　Chain connection

　　Jiankou Great Wall Section

　　The Great Wall section of the arrow buckle is W-shaped, shaped like a full bow, while the arrow buckle at the low point is like a buttonhole for taking an arrow, which is the origin of the name "Great Wall of the arrow buckle".

　　The Jiankou Great Wall has been repaired many times. In 2006, the cultural relics department carried out emergency rescue and reinforcement for Arrow Kouguan, which was threatened by landslide. Since 2016, National Cultural Heritage Administration has successively approved four projects to repair the Great Wall with arrow buttons.

　　In 2017, the first phase of the renovation project of the Jiankou Great Wall was completed, ranging from No.146 to No.150 watchtower (Taiwan), with a total of 1003 meters. From 2019 to 2020, the second and third renovation projects were completed one after another. The second phase of the project was built from No.151 to No.154 enemy building (platform), with a length of 745 meters; The third phase is from No.122 to No.130 enemy building (Taiwan), totaling 1094 meters.

　　The first and second phases of the project are located on the west side of Jiankouguan, and the third phase is located on the east side of Jiankouguan. Before construction started this year, only 135 meters west of No.130 watchtower remained between Jiankou Pass and Jiankou Phase III, so this side wall was included in one of the 10 Great Wall rescue and reinforcement projects in Beijing this year.

　　Extended reading

　　The maintenance section is mostly located in the future open scenic area.

　　Huairou District, where the Jiankou Great Wall is located, contains 284 enemy towers (platforms). Enemy platform No.154 was called "Beijing knot" by the people, and the Great Wall of Wan Li diverged from it, and journey to the south extended to Sihai Town of Yanqing. All the way west to the direction of Juyongguan in Changping.

　　From the "Beijing knot", you can go north along No.154 enemy platform to No.169 enemy platform, which is the famous enemy platform Jiuyan Building at the junction with Yanqing. This section is also part of the Great Wall of Arrow Buckle. The west side of "Beijing knot" is adjacent to No.170 watchtower, one of the four municipal projects in Huairou District this year. If you continue to the west, you can find No.180 and No.185 watchtowers in turn.

　　The Protection and Development Plan of Beijing Great Wall Cultural Belt (2018-2035) defines the spatial layout of Beijing Great Wall Cultural Belt as "one line, five pieces and many points". Among them, the "first line" refers to the Great Wall Line, and the "five pieces" are five core group areas used to relieve the pressure of tourists in the Great Wall Open Scenic Area. The paragraphs repaired in Huairou District this year belong to the Huanghua Road group area.

　　Chain connection

　　World Heritage Committee spoke highly of the Great Wall protection.

　　At the 44th World Heritage Conference held this year, the World Heritage Committee spoke highly of the positive and effective measures taken by the China government in the protection of the Great Wall, so that the outstanding universal value of the heritage has been properly protected; At the same time, it appreciates the efforts and achievements made by the China Municipal Government in promoting the construction of the Great Wall National Cultural Park, promulgating and implementing the Master Plan for the Protection of the Great Wall, as well as in public communication and promotion, capacity building of heritage sites, special protection legislation, application of modern science and technology, international exchanges and cooperation, and easing the pressure of tourism.

　　Cctv news (Reporter Li Wenliang, Tang Shiying, Liu Chunyi, Chu Wei) October 11th — On the 13th, 2019 China International Digital Economy Expo was held in Shijiazhuang (Zhengding) International Convention and Exhibition Center. CCTV conducted a 5G+VR live broadcast of the opening ceremony and theme summit of the conference.　

　　This is the only national exhibition named digital economy in China. In May this year, with the approval of the CPC Central Committee and the State Council, the Ministry of Industry and Information Technology and the Hebei Provincial Government held an annual China International Digital Economy Expo.

　　Applying for hosting China International Digital Economy Expo is an important measure for Hebei Provincial Party Committee and Government to accelerate the development of digital economy and deepen the structural reform on the supply side. It is also an important content to actively adapt to the new requirements of opening up in the new era, build a national, international and high-standard economic exchange and cooperation platform, and realize innovation-driven and high-quality development.

　　Organizers said that the digital economy is an "accelerator" to promote the quality change, efficiency change and power change of economic development, and has become a new highland for countries all over the world to compete for development. Holding the China International Digital Economy Expo conforms to the general trend of the development of the world digital economy; In recent years, China has actively developed the digital economy and constantly explored new industries, new formats and new models. The digital economy has become a new engine to promote China’s high-quality development. Holding the China International Digital Economy Expo conforms to the general trend of high-quality development in China; At the same time, the holding of China International Digital Economy Expo also conforms to the general trend of building Hebei into a strong digital economy province. In recent years, Hebei has issued three-year action plans such as industrial transformation and upgrading, strategic emerging industry development and scientific and technological innovation, formulated policies and measures with high gold content, and made efforts to develop industries such as big data, cloud computing, new display, intelligent equipment and industrial Internet to accelerate the construction of a strong digital economy province. We have successively issued a series of policies and measures on accelerating the development of the digital economy, building a strong network, promoting information consumption, cultivating and developing integrated circuits and 5G, accelerating the cultivation and development of a new generation of information technology industries, and promoting the deep integration of the Internet, big data, artificial intelligence and the real economy. Digital government affairs, digital tourism, digital medical care, digital transportation and digital ecology have been accelerated, and the pace of transformation and upgrading has been accelerating.

　　In the era of big data, Hebei firmly grasped the historical window period and strategic opportunity period, and pressed the fast-forward button in promoting "digital industrialization and industrial digitalization". A digital economy stage with good foundation and broad prospects is opening to the whole world.

　　We will make every effort to create a digital economy event that is "leading domestically and first-class internationally". The theme of China International Digital Economy Expo in 2019 is "Digital Economy Leading High-quality Development", and we will adhere to the principle of "internationalization, specialization, high-end and industrialization", focusing on digital industrialization and industrial digitalization, attracting talents from the meeting, gathering wisdom and prospering with the meeting, and focusing on planning "one meeting, one exhibition, one salon, one meeting". —

　　"A moment" is the opening ceremony and theme summit. State leaders, relevant state ministries and commissions, leaders of sister provinces and cities, and a group of scientists, entrepreneurs, experts and scholars, platform organizations and media people with strong influence in the global digital economy are invited to attend the conference. Nobel Prize winners in economics, nearly 200 important international guests from more than 20 countries and international organizations, more than 20 academicians of the two academies, more than 150 industry leaders, and more than 80 well-known experts gathered together to discuss the digital economy.

　　"One exhibition" is a comprehensive exhibition. There are five exhibition areas, including theme exhibition hall, Beijing-Tianjin-Hebei collaborative and digital Hebei exhibition hall, new generation information technology exhibition hall, intelligent manufacturing and intelligent society exhibition hall and outdoor exhibition hall, covering an area of 50,000 square meters, with more than 500 enterprises participating. Among them, there are more than 180 leading enterprises in digital economy at home and abroad, including Siemens, Amazon, Dassault, Huawei and Baidu, accounting for 35% of the total number of exhibitors. Among them, there are Siemens Digital Twins, Amazon AWS, Ericsson Panoramic Live Broadcasting of Winter Olympics, China Electronics’ Fit CPU+ Kirin Operating System, China Electronics’ Perception of City+Data Centralization, Huawei’s 5G+ Kunpeng, Baidu’s Apollo Autopilot, Alibaba’s Digital Government and Tencent. There are also popular digital cultural products such as Aauto Quicker, Bili Bili, Himalayan and Migu Culture, and future products in many fields such as 5G, big data, artificial intelligence, Internet of Things, industrial internet, intelligent networked cars, intelligent robots and digital media complement each other. 338 exhibitors from Beijing-Tianjin-Hebei Collaborative and Digital Hebei Pavilion,More than 200 enterprises participated in the exhibition in 11 districts and cities in Hebei and xiong’an new area exhibition area. The Big Data Excellent Case Exhibition Area of the Ministry of Industry and Information Technology focuses on the outstanding products and application solutions of more than 100 big data "national teams".

　　"One Salon" means "Zhengding Night" digital economy theme salon. Co-organized by China Electronics Group, China Electronics Group and People’s Daily Online. Through the 3D holographic projection technology through history, digital technology+Yanzhao hero Zhao Yun and Changshan drums are alternately interpreted, which fully reflects the sense of science and technology and the sense of the future of Zhengding Night. A group of industry big coffees talk on the same stage about "digital economy boosting Hebei’s transformation and development", which makes Zhengding ancient city glow with the new charm of modern digital technology.

　　"One experience" is the intelligent networked automobile automatic driving experience activity. Great Wall Motor uses the most advanced sensing, planning and decision-making technologies to demonstrate fully autonomous autonomous self-driving and 5G driverless cars, and challenge many difficult self-driving scenarios. Huawei exhibited the "Huawei 5G China Tour" roadshow, showing Huawei’s latest 5G end-to-end solutions, 5G black technology and minimalist operation and maintenance business model. China Unicom exhibited the 5G "Dream Journey in Time and Space" fully immersive VR experience car, and experienced the 5G Mars exploration journey. The cloud network cooperated and was there, and felt the low latency and high speed brought by the 5G network, as well as the infinite scientific and technological charm brought by real-time computing and rendering in the cloud.

　　The "First Competition" is the World University E-sports Championship and the National University E-sports League. Players from 10 countries including Brazil, Mexico, the United States, Nigeria, Australia and South Korea have been selected in the early stage of the World University E-sports Championship to participate in the offline finals during the Zhengding Digital Expo. The National College E-sports League has participated in more than 900 colleges and universities this season, with more than 100,000 people directly participating in the competition. During the Zhengding Digital Expo, the national finals were organized, and 56 players from 12 colleges and universities were selected to compete for the e-sports championship.

　　"Three docking" means three industrial docking activities. Focusing on the promotion of "digital industrialization, digital industry", we held three industrial docking activities, such as the next-generation information technology industry matchmaking meeting, the "China Digital Dam" matchmaking meeting and the Hebei-Shenzhen industry matchmaking meeting, and signed a number of major cooperation projects around the development of 5G and next-generation information technology. At the same time, free project negotiation areas are arranged at the exhibition site and conference area to provide a relatively independent docking negotiation platform for exhibitors and participating guests.

　　"Multi-forum" is more than 10 parallel activities, such as the Smart Xiong ‘an Summit Forum. A group of academicians, experts and leading figures will have dialogues and exchanges around hot topics in the industry, such as Intelligent Xiong ‘an, 5G/ Internet of Everything, Industrial Internet and Intelligent Manufacturing, Next Generation Artificial Intelligence, Big Data+Cloud Computing, etc., and carry out ideological collisions to lead the development of the industry. At the same time, China Digital Economy committee of 100 Closed Meeting and Enterprise Digital Transformation Summit Forum will be held to offer suggestions and suggestions for accelerating the development of digital economy.

　　"Multi-release" means the release of a number of authoritative achievements. During the conference, Forbes China, China Information and Communication Research Institute, China Electronic Information Industry Development Research Institute and other units will release more than 10 research results, including Forbes Top 100 Global Digital Economy List, 2019 Global Digital Economy Development Report and 2019 China Digital Economy Index White Paper.