On March 16, after 1084 days and nights of tenacious struggle, the world's longest spiral tunnel under construction -- G7611 West (Chang) Zhao (Tong) Expressway Laoyingpan No.1 Tunnel, which was built by our company and China Railway Second Bureau, was successfully completed. This also broke the record for the length of the spiral tunnel, making it the longest spiral tunnel in the world.

part1

 Laoyingpan No.1 Tunnel is located in the mountain gorge area of Jinyang County, Liangshan Prefecture. The geological condition is generally poor, and there are bad geology such as faults, karst, and large deformation of soft rock, which makes the construction difficult. The height difference between the entrance and exit of the old yingpan circling and rising tunnel group is 213.35 meters, which is equivalent to 72 floors. although the straight line distance between the entrance and exit of the tunnel group is only 1.6 kilometers, the actual route winds 7.74 kilometers in the "belly" of the mountain. this is a spiral tunnel designed to solve the climbing problem of mountain lines. the height difference between the entrance and exit is solved through a long longitudinal slope, clever implementation of "length for height".

   Xizhao Expressway is an expressway connecting Zhaotong City, Yunnan Province and Xichang City, Sichuan Province. It is a section of Duxiang Expressway planned in the national expressway network. After the completion of the project, it will be connected to the G85 Yu-Kun Expressway to the east, and form a large sea passage with the under-construction and planned expressways in Yunnan, Guizhou, Guangxi and other provinces; the west passes through the east-west route Xixiang Expressway, adding a connection with Yunnan and Tibet. The Sichuan passage together forms the Duxiang Expressway passage, which plays an important role in the regional highway transportation network. At the same time, as another important exit channel and economic trunk line of Panxi Economic Zone in Sichuan Province, Xizhao Expressway will further strengthen the connection between Chengdu Economic Zone, southern Sichuan Economic Zone and Panxi Economic Zone, It is of great significance to enhance the capacity of the national expressway network, strengthen the status of Liangshan Prefecture as a transportation hub in the junction of Sichuan and Yunnan, and accelerate the social and economic development of ethnic areas in Sichuan Province.

part 2

 Xizhao Expressway Laoyingpan Tunnel 1Select Ruilong full set of independent intellectual property rights tunnel construction equipment:

1: Intelligent lining trolley, automatic layered pouring concrete system, automatic rail feeding and rail laying system, adjustable steel end formwork system with water stop belt, high gas explosion-proof integration, large flow ventilation as a whole, remote control operation, improve pouring quality, improve construction speed and reduce labor.

2. Cantilever tire walking inverted trestle, set tires to walk continuously, without track walking, greatly improving the walking speed, fully remote control operation, one person can operate the whole trestle, equipped with inverted arch moving formwork, cooperate with trestle automatic demoulding, automatic walking, improve inverted arch construction speed, improve inverted arch construction quality, greatly improve the fast and safe passage of construction vehicles.

3. Waterproof board steel bar laying trolley: set automatic track laying and rail delivery (tire or trackless running), automatic waterproof board laying trolley, waterproof board transfer trolley, automatic pushing steel bar system, fully telescopic steel bar binding platform, fully remote control operation, can lay 7 m wide waterproof board and geotextile at one time, reduce longitudinal splicing of waterproof board, improve laying efficiency and quality, reduce labor intensity and reduce labor.

4. Automatic lining maintenance, maintenance trolley, automatic spraying, heating constant temperature, automatic water addition, automatic unattended reciprocating spray maintenance, quality inspection and repair as a whole, maintenance process does not interfere with feng shui pipeline, does not need track laying, does not need to correct trolley deviation at any time, so as to be truly unattended, concrete maintenance quality directly determines the microscopic characteristics of concrete materials, early maintenance is proper, late concrete density is high, and total void rate is low, the content of capillary pores is reduced, so reasonable curing will obviously improve the early performance of concrete, such as strength and permeability resistance. Temperature, humidity and curing time are the main control parameters in the curing process of concrete materials. Adequate moisture, appropriate temperature and necessary curing time are important guarantees to realize the durability of concrete.

About Ruilong

Mission: Based on intelligent construction equipment of tunnel and bridge, Dare to open up and innovate infinitely, and provide more stable, safe, reliable and efficient products.

Purpose: honesty, customer first, technology first, unity and cooperation, pragmatic.

Vision: Create a leading brand in the industry.

Ideas: Professional, single-minded, attentive, focused.

Values: Manufacturing depends on low cost, competition depends on high quality, so that customers can buy satisfactory products, employees can find a home, and shareholders can be rewarded./Social, win-win with suppliers.

On March 16, after 1084 days and nights of tenacious struggle, the world's longest spiral tunnel under construction -- G7611 West (Chang) Zhao (Tong) Expressway Laoyingpan No.1 Tunnel, which was built by our company and China Railway Second Bureau, was successfully completed. This also broke the record for the length of the spiral tunnel, making it the longest spiral tunnel in the world.