Standing on the newly completed main tower, you can see far into the distance.，Nearly 1000 meters high, the axe cut the cliff as if magnificent.、Magnificent promenade mural，The Huajiang Canyon Bridge of Lu'an Expressway under construction stands proudly in this magnificent picture.。
Huajiang Gorge Bridge is located in Guizhou Province.“Fourteen five”Key projects of integration of bridge and brigade in the period，It is also a key demonstration project of integration of transportation and tourism in Guizhou Province.。The bridge is the control project of Lu'an Expressway.，The total length is 2890 meters，The main bridge has a span of 1420m.，Liuzhi Bank Cable Tower is 262 meters high.，The vertical height of the bridge deck from the water surface is 625 meters.，It is expected to be completed in 2025。At that time，Huajiang Gorge Bridge will become the highest bridge in the world.，It will also refresh the record of the largest span of mountain bridges.。
“During the construction of Lu'an Expressway，We will fully implement the spirit of the 20th National Congress of the Party.，Focus on innovation-driven development，Promoting Green and Low Carbon Construction，We will strive to build the Huajiang Canyon Bridge into the first multi-functional complex in Guizhou that integrates bridge sightseeing and high-altitude exploration.，And strive to build it into‘The First Tourist Gateway in Southwest Guizhou、A New Model of National Bridge and Brigade Integration、World Canyon Extreme Sports Resort’，To contribute to speeding up the construction of a strong transportation country。”Party Branch Secretary of Lu'an Expressway Co., Ltd.、Chairman Chen Fei said。
Opposite the mountain gate
Blend of bridge and scenery
October 2022，Issued by the Ministry of Transport《Supporting Guizhou to break a new path in the development of the western region in the new era and realize the implementation plan of high-quality development of transportation》，It is proposed to support Guizhou to deepen the integration of transportation and tourism.，Build a demonstration project of integration of bridge and tourism and a brand of integration of road and tourism。
Chen Chao, general manager of Lu'an Expressway Co., Ltd.，In order to build the Huajiang Gorge Bridge into the first bridge covering“Bridge sightseeing+Bridge sports experience+Tourism services”The goal of the integrated bridge-brigade integration complex.，Integrating Project Construction into Regional Culture、Ancient Village Culture of Huajiang Village、Buyi ethnic customs and other elements，It also lays a good foundation for the later construction of the bridge tourism integration service area and the expansion of the tourism function on the bridge.。
The bridge as a whole adopts the shape of the mountain gate.，One bridge connects Anlong、Six branches on both sides，Watch the beautiful mountains and rivers of Guizhou；Bridge body painting will be selected“Buyilan”，Full display of ethnic customs；The maintenance footpath on both sides of the truss is partially transformed into a landscape corridor.，After completion, you can overlook the peaks and forests in the Huajiang Grand Canyon.；The glass sightseeing house of the main tower is the highlight of the whole bridge.，At that time, it will take one minute to reach the top by vertical sightseeing elevator.……The design of the bridge draws inspiration from the landscape culture.，Every detail reveals strong local feelings.。
Intelligent construction
Don't be afraid of the high tower and the strong wind
“To serve Guizhou and meet the economic and social development of Guizhou as the fundamental starting point and foothold，With‘Excellent quality、Resource conservation、Ecological environmental protection、Energy saving and high efficiency、Service improvement’Be fundamental，The traditional technology model in the construction process is obvious.‘Insufficient power’。For this reason，We build a continuous innovation mechanism from multiple dimensions.，Steadfastly Promoting Green Highway、Quality Engineering、Construction of typical demonstration projects such as science and technology demonstration。”Deputy Secretary of the Party Branch of Lu'an Expressway Co., Ltd.、Deputy general manager Zhang Yulu said.。
“Affected by topography and climate，Gust is a frequent visitor here.。”Zhang Yulu introduced，The wind speed of mountain canyon changes rapidly.，There is a very strong burst.，It is very easy to affect construction safety。Single hydraulic climbing formwork system is difficult to meet the actual needs of super-high concrete bridge tower，It is also difficult to realize the automation and mechanization of construction.，Huajiang Gorge Bridge Needs to Explore a New Technology。
After repeated exploration and research and scheme comparison and selection,，Builders have developed a vertical mobile factory system for super-high cable towers in mountain canyons。The system adoptsBIMModel shape fitting andCADDeepening Design of Fine Modeling of 3D Template System，Constructed with hydraulic system as power“Climbing platform with decreasing section+Top frame of construction platform+Built-in platform”As an integrated tower building platform，Design and development of the entire space set、Formwork climbing、Position adjustment of rebar components、Concrete precision cloth、Automatic vibration、Wind environment monitoring and intelligent maintenance、Fire control、Lightning protection、Construction lighting、Security monitoring、Emergency escape and other integrated control.，And through the construction Tower Crane、Construction Elevator、A series of supporting equipment, such as stress support, improve the climbing formwork system.，Significantly improve the quality and efficiency of engineering construction，And that construction safety is ensure。
Modular hoisting process for main reinforcement of segmental reinforcement cage of cable tower column。
On this basis，Huajiang Gorge Bridge“Factory production、Assembly construction、Intelligent control”It is the general idea，Further explore assembly、Automation、Intelligence and digitalization，Fusion mixing station intelligent flake ice machine and large volume intelligent temperature control system、Intelligent maintenance、Modular installation of large-diameter rebar、The main tower and the group towers（Tower Crane）Intelligent monitoring system platform and other technologies，The system integration research on the construction technology of long and large bridges in mountainous areas is carried out.，Security to be constructed、Efficient、Quality、Economy、Green long bridge construction industry chain，And integrate the industrial chain、Value chain、Innovation chain and service chain，Promote the industrialization of construction technology of long and large bridges in mountainous areas、High precision、Intelligent。
Climb over the eaves and walls to open a new road
Monorail Slag Overcoming Difficulties
In the mountains，A 7.The 5-meter-wide road twists and turns.，Shaped like a ribbon，Directly to the bottom of Anlong Bank Main Tower of Huajiang Gorge Bridge。Below the road is the bridge approach.，No.15 of the rigid frame bridge、No.16 main pier，Gravity Anchorage of Main Bridge、Anchorage drainage tunnel and other construction sites are in good order.。
“This is the service road we built.，A year ago, it was a cliff.。”Wu Chaoming, project manager of Lu'an 8 Bid, told reporters.，Initial approach，Because the slope of the mountain is over 80 degrees.，There is not even a decent road in the mountains.，Mechanical equipment is not accessible at all.，The construction basically relies on manual small-scale blasting to excavate the access road.。Construction workers risk falling rubble at any time.，Tie a safety rope，Climb like Spiderman，Carry out presplitting blasting on one sides、Road excavation with short footage construction，One side is made of steel bar section、Steel formwork、Enclosure composed of thick iron wire and other anti-rolling stones to ensure the safety of construction below。“Below is the Grand Canyon hundreds of meters deep.，It can be said to be alarming step by step.。”That's all，They chiseled out a wall-hanging road between the cliff and the deep valley.。
Pile foundation construction of No.5 main tower。
During construction，A little carelessness will cause rocks to roll down.，On the one hand, it will affect the ecological environment of the mountain on the side of the subgrade free face and the surrounding area at the foot of the mountain.，Later repair is extremely difficult.，On the other hand, it will also pose a great threat to the construction safety of the lower construction site.。
Lu'an 8 bid has been tried repeatedly in combination with the actual situation.，Finally, the boulder was drilled through the center and then bound and fixed with steel wire rope for many times.，As well as control that quantity of explosive and layered multiple blas on steep slope.，To ensure the protection effect of the enclosure protection system to the greatest extent，Ensure that the construction of the bridge proceeds in an orderly manner according to the planned time nodes。
Later, this access road will become the main tower tour for tourists from the leisure accommodation area to the Huajiang Canyon Bridge.、Experience the only way for bridge tourism projects such as glass trestle road and outdoor extreme sports.，Its restoration and transformation work is very important.，In addition, it is located on a steep rock wall.，It is difficult to carry out alternate operation from top to bottom，High security risk。To this，Bid 8 of Lu'an breaks through difficult problems one by one，Summarize and form《Based onBIMGreen ecological route selection and excavation construction method of rock steep slope subgrade》，Recognized both inside and outside the industry，It has important reference significance for similar engineering construction.。
On both sides of Yunzhuang Tunnel of Lu'an Expressway，Each has a huge trumpet-shaped pit with a depth of 100 meters.，The digging machine in the pit is busy digging mountains and rocks.。
“This is the tunnel anchor on the Liuzhi Bank of the Huajiang Gorge Bridge.。”Deputy General Manager of Lu'an Expressway Co., Ltd.、Chief engineer Ran Guangming told reporters.，The steep cliffs of Liuzhian Canyon have a slope of 80 to 90 degrees.，The terrain is steep、The drop is large，The gravity anchor scheme is obviously not adaptable to the terrain，The tunnel anchor is the only choice to rely on the surrounding rock mass and the anchor body to bear the tension of the main cable.，And that lat maintenance cost is relatively low.。
According to introduction，In the process of tunnel anchor construction, it is generally encountered that there is no site at the entrance of the tunnel.、Large excavation slope and high section of cavern、Difficulties in dregs transportation and deslagging, etc.，The tunnel anchor of Huajiang Gorge Bridge is the deepest design of the same type of bridge in mountainous areas at present.、Largest size structure，On the basis of conventional difficult problems，There is also a steep terrain.、The bedrock is exposed、Large excavation volume and other difficulties。
“It is difficult to solve the problem of large capacity for ordinary inclined shaft track transportation and mucking system.、Two Difficult Problems of Large Inclination，It can not meet the requirements of ensuring the efficiency and safety of the project.。”Wang Chaoguo, project manager of Lu'an Bid 7, said.，“We combine the actual needs of tunnel anchor construction.，Explore and develop a multi-functional slag tapping system for tunnel anchor，Only one track is used to meet the requirements of the slag Truck and the Excavator at the same time.、Concrete wet spraying machine、Access requirements for drilling and other equipment。”After using the system，One-time slag discharge has increased from 4 cubic meters to 12 cubic meters today.，800 tons of slag per day，It not only shortens the construction period of tunnel anchor，At the same time, efficiency is taken into account.、Cost and safety。
From the formation of pile foundation to the erection of the main tower……The length and height of Huajiang Gorge Bridge，They are all imbued with the wisdom and sweat of the builders.。Coming up，Builders will be working on the superstructure of the bridge.，Continue on the path of innovation，Challenge all the way、Surpass all the way。
