Maowei Sea Yuelong Gate -Longmen Bridge Construction Side

"Fan drove the mountains, and the sky was swallowing; the breeze blew the moon, and Guo Shangqing." This is the vivid description of the ancients of Longmen 72. Not far from this wonderland of the world, a bridge is lying on the sea, and the first kilometer -level suspension bridge in Guangxi, the Longmen Bridge, is being built steadily and orderly. The Longmen Bridge is 7.6 kilometers in length and is located in the Maowei waters. The main project consists of Longmen Bridge, Yangfan Lijiao, and three section of the road base. The main bridge is 6597 meters long. The suspension bridge meets the 20000GT cruise navigation requirements. The two -way six -lane -level highway construction standard is adopted, and the driving speed is 100 kilometers per hour. The Longmen Bridge is the largest cross -sea channel project in the history of Guangxi's traffic construction, the most complicated technology, the highest standard, and the most complicated environment across the sea environment. It is also the most tight cross -sea project in China. On November 23, 2021, the east anchor of the Longmen Bridge was only used for 5 days. For total 118 hours, the one -time continuous pouring of 47,000 cubic meters of concrete was completed. On May 20, 2022, the main tower on both sides of the bridge on both sides of the bridge was successfully capped in only 8 months. In this race with time, the construction unit seems to always seize the opportunity and speed up the construction of the project. How did the seemingly incredible task created?

The first round -round bite pile

For a world -class bridge engineering, the traditional anchor foundation surrounding structure is generally used in the form of underground continuous walls, and the construction lining is required to dig anchor pits. However The pile structure form can directly excavate the foundation pit and efficiently promote the construction progress, which saves 3 months for the formal entering the core pouring stage.

Figure 1 East Main Tower

During the construction of the site, Jiang Ganzhang, deputy general manager of Guangxi Road and Bridge Group and Longmen Bridge Project Manager, talked about the most impressive thing is the accuracy of the positioning of the reinforcement cage and the quality of the cycling pile. Because the reinforcement cage of the round torque bite pile is an alien reinforced cage, if the pores and reinforced cages are not met with the requirements of the pores and reinforced cages during the construction process, the reinforcement will be damaged during the second phase milling slot. Essence Based on this, the construction team compared the land connecting wall of the world's first Gongping South Bridge, and inspected the construction of the Shenzhen -Middle Channel floor wall, the Nanning subway floor wall, and the 3m diameter pile construction of the Nanyu Railway. The work efficiency, pores and pile quality of drilling, rotating diamonds, impact drills, and milling machines. Through searching for literature, inquiry experts, etc. to find problems to solve ideas, and conduct multiple discussions with the company's internal experts, well -known domestic experts, etc., optimize the construction plan, adopt a diagonal meter, reinforced cage restriction device, steel isolation boxes, steel isolation boxes At the end of the measures, the finished product of the bite pile was finally completed. At present, the foundation of the anchor has been completed, and there is no leakage of the support structure during the excavation process of the anchor pit, which can be regarded as dripping.

Figure 2 Large diameter pile steel cage

In terms of design, compared with the wall connecting the wall, the cycling pile has the advantage of digging the foundation pit directly. In addition, the combination of round -bite piles is excellent, and the bite pile and the foundation of the anchor are together to form an anchoring composite structure, which is commonly stressed; in terms of progress, the basis of the round torque bite pile is compared with the wall+inner lining foundation. The structure and excavation construction takes 3 months, and the overall progress is fast; in terms of cost comparison, the rounded bite pile saves 10%of the reinforced concrete than the wall, and the construction can be used for construction during construction, compared The construction of the wall has greatly reduced costs.

Figure 3 Anchor cyclic round bite pile

In addition to the construction of anchors, the Longmen Bridge project aims to build the dual demonstration project of the Ministry of Transport "Science and Technology Xing'an" and "Ping An Centennial Quality Project", comprehensively promote the application of four new technology, fully promote mechanized substitution, automatically reduce people, and actively build it Standardized project manager departments, informatization all -closed concrete supply centers, automatic steel component processing distribution centers, and customized concrete durability durability laboratory, equipped with powder smart access control system, door -type car wash machine, five -level sedimentation tank+filter filter machine Intelligent equipment and other intelligent equipment such as sewage treatment system, automatic spray dust reduction system, reinforced steel cutting robot, welded robot; comprehensively implement oversized torque rotation drilling, static pressure planting machine, slope protection rig, ultrasonic hole detector, plastic steel template, pile foundation, pile foundation Four new technologies such as ring cutting method; at the same time, actively carry out micro -innovation activities such as the waterproof treatment of the culvert and the waterproofing of the culvert, the suspended mud pump, the detachable suspension tendon, and the reinforced protective sleeve, which greatly improves the project industrialization, informatization, and the information Intelligent construction level helps to improve the quality of project construction.

Refresh the world's largest single continuous pouring world record

In November 2021, the construction team decided to do the most bloody thing when the weather was the coldest. Low temperature in November is the best time to pour large -volume concrete. If the anchoring core fails to complete it in time, it is difficult to complete the foundation of the anchor in the most suitable winter. Depending on the pouring data of the same type of super bridge, each time the core is filled with concrete pouring, it needs to be cleaned up. If 47,000 cubic meter of concrete is poured, it takes almost a month to complete. In order to further save the construction period, the Longmen Bridge Construction Team boldly made a bold breakthrough in planning and decided to adopt a one -time continuous pouring method. This is a huge test of backcourt preparation and personnel organization coordination. The Longmen Bridge Construction Team organized a number of preparatory meetings. Hundreds of elite backbones were deployed within the group, and a dozen pouring guarantee teams were established to carry out grid division of labor. In addition, a large -volume concrete continuous pouring temperature control scheme, raw material quality control scheme, on -site continuous and orderly pouring construction site layout plan, and a total of 11 production line continuous preparation schemes. In the process of continuously poured 47,000 cubic meter of large -volume concrete, the construction team adopted measures such as prefining the concrete raw materials in advance, the orderly cloth vibration of the pouring process, and timely water storage and maintenance after pouring. The hydrophilic temperature rising heat rises meets the requirements, no temperature shrinkage, and the effect of the anchor's foundation is not greater than 5mm. It has been proven after practice that the one -time pouring of the anchor -filling core has greatly saved the construction time, and provides reference for reference to the same type of bridge. Finally, after 24 consecutive hours of construction and non -solving construction operations every day, the east anchor of the Longmen Bridge only took 5 days for a total of 118 hours. Construction of the world's largest single continuous pouring world record. Figure 4 The anchor puppet filling core continuously poured at one time

"In the face of a large amount of pouring square, large pouring area, long pouring time, high temperature control difficulty, and high construction organization requirements, the project should be planned in advance, make every effort to build construction organizations and production safety, and ensure pouring tasks. Successfully completed. "Jiang Ganzhang, deputy general manager of Guangxi Road and Bridge Group and the manager of Longmen Bridge project, said in an interview. In this race and time, the pouring was not inseparable from the subtle control of management. The informatization application of the Longmen Bridge project is divided into two major sections: information system platform management and BIM technology application. Among them, system platform management involves smart materials, trestle bridge traffic management, smart helmet, steel processing management, drone closing platform, security management The system; BIM technology application involves the use of new technologies such as BIM+GIS/UAV, BIM+3D printing, BIM+VR/AR. Based on information management, the project's intelligent material management system mainly has four major functional modules: production management module, ratio management module, material management module, report management module, etc. Realize the materials of the material in the multi -angle video surveillance, the infrared alarm, the automatic identification of the license plate number, etc., and avoid the fraud behavior of the existence of the material. The system mixed material production execution plan management adheres to the principles of "planning, approval, cooperation ratio, and re -materials", and realize the traceability of the entire process information. Relying on the Internet of Things and full IP architecture, the project forms a smart helmet and smart supervision platform. The smart helmet has abnormal behavior alarm functions such as falling alarm, SOS alarm, and high temperature alarm. The first time the police reminded the background personnel to prevent the occurrence of accidents to the greatest extent and reduce the damage of accidents; the smart helmet also has the functions of remote guidance, audio and video calls, trajectory releases, on -site recording and uploading background. In real time, personnel communicate in real time to carry out strict process management and control of the construction materials, construction processes, and quality sampling inspections to further improve the level of project safety management.

"Hard core" romance of cross -sea bridge

When the project is accelerating the fast lane, when facing the mangroves growing by the bridge under the bridge, the construction team did not hesitate to choose to slow down. In the 56 preliminary work of the project, the protection of mangroves is the first time. This is the pressure that has never been before, which is equivalent to re -conducting on -site surveys. As the first high bridge that spans more than kilometers in Guangxi, it is unimaginable to cross the seventy -two mangrove distribution area of ​​Maoweihai, Qinzhou City, and it is absolutely unimaginable. In 2013, the construction of the Longmen Bridge was approved. At that time, the Dongyin Bridge designed through the 1200 -meter mangrove growth zone will affect the "sea forest in the sea". Before the construction of 2020, how to avoid the mangrove reserves, experts and government decision makers group strategies, re -modified the design, proposed a variety of solutions, repeatedly compared the demonstration, and modified the design to make the Dongxin Bridge bypass. The new design scheme spends more than 500 million yuan more than the original plan. When the economic account is calculated, it will know: a bridge with a width of 32 meters. The original design may endanger mangroves. The bridge is around to protect the cost of the mangrove forest near 30,000 yuan. The ecological advantage does not change. Therefore, the Dongxin Bridge detoured, and the sails were settled from the new location. The Longmen Bridge came from the shape of a dragon at sea. Although the steel structure trestle is built outside the protected area, it is also distributed with mangroves. Installing bridge columns usually clean up the surface, which is inevitable to hurt mangroves. To this end, the construction unit racks its brains and uses a brand new "pins method" to build a trestle bridge: the steel bridge is lifted from the high altitude, selects the gap between the empty space between the red trees, and the large steel needle is vertically tied to the bottom of the beach. The two rows of steel columns that support the trestle stand across the sea, and are accompanied by 12212 red trees on the surrounding beaches. Figure 5 Longmen Bridge insists on mangrove ecological protection

"Since the establishment of the environmental protection department of the project, the management punishment mechanism is established as soon as possible, and the rules for the punishment of environmental protection construction breach of environmental protection in accordance with the environmental protection agreement will be punished to punish environmental protection construction, including pollution of the ocean and mangroves; Training and learning, and carried out simultaneously with project safety education, establishing the red line consciousness of the protection of mangroves for the protection of the front -line construction personnel, and realizing the participation of all members to participate in environmental protection. "Jiang Ganzhang introduced. Those who do not regularly conduct daily inspections of 10 mangrove monitoring points on the entire line, optimize measures such as prefabricated beam construction technology, simulated rainfall and cleaning mangrove leaf noodles, and prepare mangrove protection plans and emergency plans. Strengthen the cooperation with external related scientific research units, focus on the principles of being able to keep the mangrove '', and the guarantee must be guaranteed ', and promote a series of scientific research tasks such as mangrove transplantation tests, and focus on minimizing the impact of construction production. "Longmen Dragon Gate There are no dusty construction on the bridge construction site, and all of them are high -standard hardening roads. The person in charge of the project pointed to the mangrove forest in the sea to explain that when it is raining or even a typhoon, the hardening road can greatly reduce the sand and stone into the sea. The "small mountain bag" covered with plastic cloth on the roadside with plastic cloth. Below is all the surface soil dug out of road repair. It is also to prevent it from entering the sea. Still fat. The wide and deep drainage ditch on the roadside, clearing one color is three -sided light hardening canal, rainwater flowing into the sedimentation tank, before entering the sea to filter and purify in the pond. On the new soil rolled by the side of the roadside, the new planting grass and rattan plant green oil, naked soil. These "blocking lines" intercepting sand and stone soil have a total of eight. Such a grand project and such a busy construction, the seawater in the operation area is still blue.

Figure 6 Mobile molding bridge

Construction will inevitably dust, and the dust is inevitably falling into the mangrove forest. The construction unit is equipped with a spray car and "bath" for mangroves every day to make them "body" clean and "appearance". The bridge "avoids" the tree, the tree of the tree to "move" the bridge, and the "protection" of the person to the tree is a hardcore romance that belongs to this cross -sea bridge. The bridge means the bond, which means opportunities. A highway "beaded into a chain". Guangxi Binhai Highway is a high -grade highway connecting the coastal cities along Beibu Gulf. It starts from the west of Fangchenggang Dongxing and Beihai Mountain Exit in the east to Fangchenggang, Qinzhou and Beihai. Among them, Longmen Bridge is an important part of the main line of the Guangxi Binhai Highway. It is one of the two "card points" projects. The project is located in Qinzhou. The construction of the project is of great strategic significance for promoting the open development and high -quality development and high -quality development of Beiqin's integration, high -quality development, accelerating the establishment of a new growth pole of the Beibu Gulf coast, promoting the new land and sea channels in the west, and a new round of western development. Qinzhou has a long history and profound heritage. It is one of the starting points of the ancient Maritime Silk Road. The overall life of Qinzhou is slow, rich in products, developed aquaculture industry. Construction units are in the early stage of demolition work, protecting marine ecological work along the line, etc. , Will master the customs and dialects of the local ethnic minorities in advance, in order to strengthen subsequent communication, thereby promoting the construction of the project. Qinzhou is the most convenient passage in the southwest of China and the central and southern regions of China. It is at the forefront of cooperation in China-ASEAN. At the same time, the online celebrity support project, which is based on local tourism development, will effectively promote the integration and development of local tourism resources, and provide more possibilities for local people to engage in employment and entrepreneurship around tourism. The importance is self -evident in helping the economic and social development, guaranteeing and improving people's livelihood, improving people's livelihood, and improving the sense of gain and happiness of the people. It can be said that this is not only a bridge with the mission of the times, but also a bridge that enables the future. This article is published / "Bridge" magazine 2022 Issue 3 Total 107th Issue 107 Reporter / Li Shiyun

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