The Largest! The main steel structure of Greenland National Expo City Convention and Exhibition Center comes into operation!

On the 3^rd March, the Greenland International Expo City Convention and Exhibition Center project site, which was invested and constructed by Greenland Holding Group and The Second Construction Limited Company of China Eighth Engineering Division, was located in the pilot area for the conversion of new and old kinetic energy in north of Yellow River. The roof truss, as the core element of the "beam" of the convention and exhibition center, was slowly hoisted, which set the prelude to the main steel structure construction of the project and also means that Jinan has officially begun to leverage the international convention and exhibition center as the top spot.

It is reported that the Greenland International Expo City Convention and Exhibition Center project has a total construction area of 1.2 million square meters, the entire appearance is like a "V", and it stretches for 2.5 kilometers from east to west. The project is constructed in three phases, of which the net exhibition area is 510,000 square meters. After completion, it will exceed the Shenzhen International Convention and Exhibition Center and the Hannover Exhibition Center in Germany. The first phase of the project undertaken by the Second Company of China Construction Eighth Engineering Co., Ltd. has a construction area of 343,000 square meters and a net exhibition area of 150,000 square meters. The first phase includes 13 single-story exhibition halls, login halls, a 3-story conference center, a 6-story parking building, and a five-star hotel with underground garage.

While grasping the bottom line of epidemic prevention and control, The team of The Second Construction Limited Company of China Eighth Engineering Division completed the inspection and acceptance of epidemic prevention and safety conditions on February 14, becoming the first project in Jinan's new and old kinetic energy conversion pilot area to meet the conditions for resumption and resume production.

 58 tons! "Willow Leaf" roof truss is the most difficult in the country

On March 3, the difficulty of the "willow leaf" hoisting that the construction team of the Second Company of China Construction Eighth Engineering Co., Ltd. wanted to achieve was the first in China.

The roof of the exhibition hall of the Convention and Exhibition Center is composed of one and one steel trusses, which are equivalent to the rows of "house beams" of ordinary houses. Each row of the "house beams" of the exhibition hall of the Convention and Exhibition Center consists of two "willow leaves". "composition.

At the construction site, pieces of "willow leaves" welded together look more like big ships. The 63-meter long and 58-ton big guy needs to be welded for 5 days by 12 welders on a working platform similar to the shipbuilding platform. There are 78 such "big guys" in 6 exhibition halls with a total weight of nearly 5,000 tons.

Each piece of "willow leaf" needs to be slowly lifted by a 260-ton crawler crane and placed on two rows of frame columns with a height difference of nearly 9 meters. The independent height exceeds 24 meters. A seemingly simple operation, but it takes 3 hours to achieve.

It is understood that the 58-ton big guy suddenly placed on the frame column, the most stressed part needs to bear the side pressure of 18 tons, which is a severe test for the strength of the vertical structure.

"How to reduce or eliminate the influence on the stability of the vertical frame structure during hoisting, and to ensure the overall safety and stability of the structure, is very important." The construction staff of the Second Company of China Construction Eighth Engineering Bureau introduced.

The construction team must ensure that the frame columns are not crushed, but also that the "willow leaf"-shaped steel truss is not deformed. For this reason, the Second Company of China Construction Eighth Engineering Co., Ltd. has coordinated the presence of experts from inside and outside the province for many times. After many modeling checks and comparisons of various schemes, it took 2 months to finalize the implementation plan.

3 insurances! The frame column is really a giant

The structure that each exhibition hall bears the load of the "willow leaf"-shaped beams is not a heavy and heavy concrete wall, but four rows of concrete frame columns.

The reason why the frame column is chosen is that the floor of the convention and exhibition center is over 13 meters high, and the highest point is 24 meters. The frame structure can share the force to ensure its overall stability to the greatest extent. "If it is a 13-meter high solid wall, the stability It's difficult to guarantee". At the same time, the frame structure can provide the possibility for the later reconstruction and expansion of the exhibition center, such as adding passages.

In order to ensure the construction quality and safety of the concrete frame structure, the construction team of the Second Company of China Construction Eighth Engineering Co., Ltd. took three insurances in the selection of construction plan.

First, in the process of pouring reinforced concrete columns, a layer of new aluminum frame wood formwork is wrapped around the periphery, which is mainly used for shaping. This set of templates with independent intellectual property rights owned by China Construction Eighth Engineering Co., Ltd., compared with ordinary wooden templates, the carrying capacity can be increased by 20%.

At the same time, this new type of green building materials has a high turnover rate and can be recycled more than 70 times without causing pollution to the environment, while ordinary wooden formwork can only be reused four or five times.

On the periphery of the aluminum frame and wooden formwork, the construction team adopted a new type of buckle reinforcement system to strengthen the formwork in multiple ways from the periphery, which is equivalent to using a "steel hoop" to firmly lock the formwork.

In the final step, the construction team chose a new socket type disc-buckle steel pipe scaffold to support the poured concrete frame from the outside as a whole. This kind of scaffold has the advantages of high bearing capacity, good overall stability and fast construction speed. Especially in terms of bearing capacity, it is 1.5 times that of conventional steel pipe fasteners or wheel buckle scaffolding.

After the frame concrete is cured and formed, the three insurances are removed, leaving the frame structure with external light and internal solid.

Strong load bearing! 5 tons per square meter of ground

"The floor of the exhibition hall of the Convention and Exhibition Center can bear 5 tons per square meter. Even if the tank is placed in the later period, the ground will not sink and deform." The construction staff of the Second Company of China Construction Eighth Bureau introduced.

Have to talk about foundation treatment. The location of the convention and exhibition center is located in Cuizhai Town, Jiyang County, the hometown of vegetables. Before the development and construction, all were vegetable greenhouses. The soil is soft due to the perennial cultivation of crops.

To ensure the stability of the foundation, the construction team chose to replace the soil. After entering the site, the construction team dug 0.7-0.8 meters deep, removed all the original surface planting soil and replaced it with silt soil.

Subsequently, a 20-ton vibratory roller was used for layered rolling compaction. "After on-site inspection and replacement treatment, the foundation bearing capacity has reached 12 tons per square meter." The construction staff introduced.

The ground area of a single exhibition hall of the Convention and Exhibition Center is close to 10,000 square meters, which is equivalent to 1.5 standard football fields. After replacing the foundation, the construction staff will construct a 23 cm thick raft to ensure that the ground does not undergo settlement and deformation. Waterproof, moisture-proof and other treatments, and finally the surface of the exhibition center will be laid with a colored cement artesian plane layer.

"The exhibition hall is equipped with 8 gates with a height of 5 meters and a width of 5 meters. It can be said that the exhibition center can undertake various exhibitions including various types of heavy machinery equipment." The construction staff of the Second Company of China Construction Eighth Bureau introduced.

High efficiency! Create "advanced speed"

Since New Year's Day in 2018, the State Council approved the establishment of a comprehensive experimental zone for the conversion of new and old kinetic energy in Shandong, the Greenland International Expo City Convention and Exhibition Center undertaken by the Second Company of China Construction Eighth Engineering Bureau has been a leading project.

The pioneer area that undertakes the historical mission of "crossing the Yellow River in the north and carrying the river for development" in Jinan is also positioned to turn the project into a new business card for Jinan city, a new engine for Jinan's economy, and the start-up project across the Yellow River in the north and the detonation of the new urban area point.

Under the guidance and support of the Jinan Pioneer District Management Committee and Greenland Group, the project is known as creating a "pioneer speed" due to its construction speed, quality, and safety and civilized management-officially organizing the construction on October 15, 2019 Since then, 4,500-meter fences have been erected in 6 days; 310,000 square meters of vegetable greenhouses have been demolished and site cleared in 13 days; 50,000 square meters of office area, living area and workers’ living areas of the project department have been completed in 49 days, and completed in 7 days More than 500,000 square meters of frames were erected, and the main frame structures of 6 exhibition halls were completed in 26 days...

Since the autumn of 2019, Jinan City's Heavy Pollution Weather Emergency Response Office has issued warnings on heavy pollution weather many times. The exhibition project is at a critical period of the basic construction stage. In order to ensure the construction progress, the Management Committee of the Pioneer District and the Greenland Group have actively cooperated with the municipal government. Various functional departments communicate to ensure the normal supply of concrete, steel, cement and other materials to meet the needs of on-site construction. At the same time, they actively coordinate the presence of experts from inside and outside the province to coordinate and solve technical problems encountered in the project to ensure high-standard construction.

After the outbreak, the project team established an epidemic prevention and control organization as soon as possible to ensure that the responsibility field for "epidemic prevention and control" is kept. At the same time, it seized the policy and acted quickly. It passed the inspection and acceptance of epidemic prevention and safety conditions on February 14, becoming the first project in the pilot zone to meet the conditions for resumption of work and resume production in a short time. At the same time, it actively explored labor resources in the province to ensure on-site labor demand. With the active connection of the Pioneer District Management Committee and Greenland Group, the Qufu steel structure processing plant was successfully coordinated to ensure on-site demand.

Inspired by the Yellow River and Mount Tai

Since the Greenland National Expo City Convention and Exhibition Center is close to the Yellow River, the project design is based on the theme of the Yellow River, the birthplace of the Chinese nation, and the roof is designed into a corrugated shape of the Yellow River.

The design team described it poetically as “the central shared corridor symbolizing the water of the Yellow River, the vertical rhythm, the partial yellow river stone shape and the water wave-like roof shape, like solidified music, indulge in singing a song from history. Praise to the future of the Yellow River". Among them, the "willow leaf"-shaped steel trusses are also rich in design connotation, and the meaning is derived from the representative poem "Four-sided lotus and three-sided willow" in Jinan.

At the same time, the project will be equipped with a five-star hotel. According to the design team, the supporting high-end hotel in the exhibition complex will adopt a hyperbolic facade, which implies Mount Tai. The "Yellow River" and "Mount Tai" will become the strategic coordinates of Jinan's north crossing of the Yellow River!