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.

Writing and photography: Feng Xifan @ New Car Review

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At the press conference of the redesigned Yidong/Yidong XT, we heard the "spoiler" of the Changan model plan. Upgrading the original model is the "main theme" of Changan in the second half of this year.
The change is the first blow, and then we will see CS15 dual clutch and CS75.
1.5T, Yuexiang V7
1.0T and modified CS35. In other words, don’t expect to see a brand-new model this year. But don’t be disappointed. The new models will be launched next year. Here’s a spoiler again. Next year, there are plans to have CS95, Ruiyi CC, CS55 and an MPV model. The information inside is so large that it responds to everyone’s doubts about Changan’s lack of stamina to some extent.

Let’s get to the point. Let’s go back to Yi Yi XT.
Although the manufacturer stressed at the press conference that the new configuration will be slightly improved compared with the old one for the same price model. However, as can be seen from the price list, the entry model of the old model was cancelled, and the purchase threshold of Yidong rose from 74,900 to 80,900, while that of Yidong XT rose from 77,900 to 82,900.
The whole system comes standard with ESP system. It’s still the old saying I often say, to talk about cost performance without absolute price is to be a hooligan. The entry fee that has been "laid off" is estimated to be gradually replenished in the future. After all, the Yidong model should also leave some spare capacity for the next few years.

In addition to the deduction of the entry model, the 1.5T model has also been cancelled. After all, its sales share is too small. The 1.5T engine is not unemployed, but will be matched to CS75 as mentioned above.
. In the size class of CS75, 1.5T can turn customers around, which is expected to become the main sales force.
As for the automatic transmission model, the manufacturer said that 6AT would be used instead of 4AT. Considering that it often takes a long time for independent brands to match automatic gears, wait patiently. In fact, the original 4AT escape has a very good ride comfort, and the matching level is similar to those of Toyota’s previous 4AT models.

The usual trick of the car factory to change the money is to bottle the old wine in new bottles, and the three big pieces still sound like waves, and then carry out cosmetic surgery on the grille and other places. Yidong/Yidong XT has also made some changes to its appearance, but the range is too small to see through at a glance, such as changing the door handle and the rear spoiler, so I won’t elaborate here. There is a way to quickly identify the 2016 model on the road, that is, adding LED daytime running lights.
The upgrade of the invisible level is the focus of this change, which we will talk about slowly below.

The interior of Yidong/Yidong XT has been redesigned to keep up with this era. The configuration has also been improved, especially the screen of the center console. Our manual gear is equipped with Kay LiDE navigation, and it can also be connected to Baidu Carlife through mobile phones to expand its functions. In the past, the Incall function of the operator to set navigation for him was also reserved.

The biggest change of Yidong/Yidong XT is to join the direct injection 1.6L engine. Why do you say "join" instead of "switch"? Because the two engines are old and new, the manual transmission entry model still uses the original indirect injection, and the automatic transmission also uses indirect injection, which is estimated to be due to the lack of relevant matching.
The output book data of the new engine increased slightly, the maximum power changed from 92kW/6000rpm to 94kW/5700-6200rpm, and the maximum torque changed from 160Nm/4000-5000rpm to 168Nm/4000-5000rpm. The main function of direct injection technology is to reduce fuel consumption. The manufacturer claims that direct injection of 1.6L will save fuel by 8%. We see the actual effect. When driving in Qingdao, which is extremely congested, the obvious fuel consumption of the vehicle is 7.8L/100km. At first glance, the fuel consumption control of the new engine in autonomous vehicles is excellent.

I drove to the top of Yidong XT manual gear this time, using the latest 1.6L direct injection engine, and the performance of the sedan version is estimated to be close. Different from the old model, the new engine has no low torque and fatigue as before before. The more advanced driving area is more suitable for our daily driving, especially Qingdao, which is extremely congested that day and needs to stop and go frequently. Yidong XT not only doesn’t have to worry about daily fatigue, but the light pleasure of walking is actually a bit like Japanese 1.6L
A-class cars have a stronger sense of acceleration and calmness than self-priming versions of autonomous cars such as Arrizo 5 and Emgrand EC7. In fact, the acceleration of the old Yidong manual gear has been done very briskly, and the new one just inherits this advantage.

However, it may be due to the direct injection mechanism. Usually, you can hear the noise from the power system when you lightly step on the accelerator. Looking back on the old model, unless the big foot hits the accelerator, it is basically silent when stepping on the accelerator. When driving a new model, I sometimes want to deliberately control the throttle action when shifting gears, because I am afraid that passengers will hear the engine sound and mistakenly think that my manual transmission technology is not home. It is actually quite common that the noise of the power system increases after direct injection, and Honda Fit has a similar situation. In addition, in the process of gear shifting, it takes a little thought to think about the oil-separation fit, and occasionally the joint is not delicate, which will bring a subtle impact.
Although the impact is not very disturbing, I just don’t want passengers to think that I am not careful in control.

For manual transmission models, we must talk about the "novice affinity index". It can only be said that the XT clutch is easier to control, but it is not a fool. Recently, some autonomous manual gears have been tested, and the engine refueling program has become smart. Let the clutch engage.
Know how to raise the speed by a large margin. It’s a bit like a coach car whose idle speed is raised in a driving school. It can move forward easily just by lifting the clutch, and novices can easily mistake their skills for rapid progress, such as Jianghuai Ruifeng S3 and Magic Speed S6. After being used to the above-mentioned stupid car, I feel that it takes a little effort to drive the XT. Let’s talk about "feet" and "hands". The suction feeling of the manual gear is good, but the positions of the second gear and the fourth gear are very close, and the separation position is not clear. Sometimes I want to get into the second gear but get into the fourth gear.

Originally, I thought I would finish the engine test, but I felt that the vibration filtering was much better than before. Netizens often question our view that Yuexiang V7 has better driving quality than Laoyidong. The reason is actually very simple. The development time of Yuexiang V7 is later than that of Laoyidong, and the car-making level of Changan has made remarkable progress in the middle, so the driving quality of "low-end cars" is better than that of "high-end cars". However, Changan re-optimized the chassis by changing the model, which made the driving quality of the new car surpass its own Yuexiang V7. In addition to the "toughness" feeling of the suspension, another obvious improvement is NVH, which is excellent in road noise isolation, unlike some cars at the same price, so that you can always feel the wheels beating frequently by your ears. In addition, when crossing the ditch, you can’t hear the noise of the car body, and your ears are particularly clean. On the whole, Yidong XT should be one of the benchmarks of driving quality at this price, and NVH optimization is the hero behind the scenes.

Summary: the recommendation degree needs to be considered when the loan is changed to "increase the price"

Although Laoyidong is still the pillar of Chang ‘an’s sales, it is mainly sold by inertia in the later period. That is, word of mouth has been accumulated in the early stage, and even if the product strength is no longer dominant in the later stage, everyone still recognizes to buy it. For example, Chang ‘an’s own later Yuexiang V7 and Chery’s recent Arrizo 5, although the model level is lower than that of Laoyidong, the comprehensive product strength is on the contrary. The escape after the change reversed this situation, and the interior was outdated before washing. The new direct injection 1.6L is a rare type of autonomous engine that can give consideration to both acceleration and fuel consumption. After the chassis has been readjusted and NVH details have been optimized, the driving quality is superior in its class.

From the actual performance, the escape after the change is better than a series of autonomous cars such as Emgrand EC7 and Arrizo 5. However, after the change, the purchase threshold of Yidong has been raised, and the entry price has exceeded 80,000. On the other hand, the official entry price of Emgrand EC7 is more than 10,000 lower than that of Yidong. It can be said that Yidong belongs to the choice of quality, and it costs more, but the inner texture is really worth it. According to the driving experience, escape
I could have given "recommended+". Just considering the high price and the appearance that has not changed much, especially the sedan version has begun to make people feel aesthetic fatigue. To sum up, we finally give Yidong/Yidong XT a "recommendable" evaluation.

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[Chang ‘an changed the model and moved it by XT 1.6L manually]

Outstanding advantages: the new engine gives consideration to acceleration and fuel consumption; Good driving quality; Excellent NVH control;

Main short board:The noise of the new engine becomes more; The entry price is higher; There is little change in appearance.

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"New car evaluation network recommended level"