Recently, the demonstration application of 21 span cast concrete canopy at Baiyin South Station of China Lanzhou Passenger Dedicated Railway undertaken by China Railway Construction has been hoisted, marking the full application of the cast canopy system developed by the Group.

At the same time, China Railway Group has started the research and development of the standard of precast concrete canopy, laying a solid foundation for the further promotion of precast canopy.

Considering the full life cycle, the comprehensive cost is reduced.

At the same time, anti falling beam fixing measures are added to ensure the seismic demand of the overall structure.

With good appearance effect and low maintenance cost, the factory processing mode of set shaped steel formwork is adopted for the canopy components, so that the component shape can basically achieve the effect of fair faced concrete.

Among them, the low cycle reciprocating connection performance comparison test verified the connection performance of key nodes, and the cast canopy in the seismic performance test successfully passed the test of the tenth magnitude earthquake.

Compared with the cast-in-place structure, the cost of the physical canopy of Baiyin South Station is controllable.

During the R&D process of the cast canopy, the Scientific and Technological Achievements Reserve Group for Lifting Operations has applied for four invention patents, 15 utility model patents and 15 authorizations; In addition, two construction methods, a volume of relevant construction drawings and a volume of technical specifications have been formed, and the conversion rate of scientific and technological achievements has reached 80%.

The construction area of Baiyin South Station building is 9999.73 square meters, and the construction area of canopy is 14532.16 square meters, with 3 sets of 7 lines.

The second platform is 213.8m in the middle, 12m in width and 2565.60m2 in area.

The advantages of the system of roof component processing, integral platform formwork production and precast concrete canopy are that it requires less labor, the processing of precast concrete canopy components and on-site hoisting are highly mechanized, and the overall labor is less.

Compared with the cast-in-place canopy, the semi factory processing saves a lot of labor for the erection and removal of formwork and the transfer of turnover materials, and saves more than 70% of labor on the site, greatly alleviating the shortage of labor for the canopy construction.

The feasibility verification of some patent certificates is to verify the structural safety performance of the cast canopy.

Lifting Pin Anchor

The processing of roof components has innovatively invented a special movable integral platform to achieve fast assembly, quick disassembly and high turnover of component processing.

Save the construction period This system can start the off-site processing of components during the construction period of works under the platform line, retaining walls, canopy foundations, pipelines, etc.

The processing of column and support beam components uses set shaped steel formwork.

After the site is ready for operation, fully mechanized hoisting construction will be adopted to reduce the cross operation with other types of work on the same working plane, greatly shorten the duration of the critical path of canopy structure construction, and save more than 40% of the construction period compared with the cast-in-place structure, At the same time, reduce the potential safety hazards caused by cross operation.

The fixed steel formwork and movable integral platform formwork are used for the production of low-carbon environmental protection components for the hoisting of the middle plate of the cast canopy, and the turnover of the steel formwork can reach 150 times.

System characteristics The system fully integrates the advantages of bridge structure and house building assembly, featuring high prefabrication rate, less wet work, convenient hoisting and convenient standardized design.

This system is the landing application of the Group Company after the application of the innovative system of 3-span double column cast concrete canopy in Changzhi East Station in 2020.

Based on the entity of the canopy undertaken by the Group in recent years at the railway passenger station, The fully assembled concrete canopy system based on simply supported system is established.

Technical breakthrough in the physical drawing of the cast concrete canopy at Baiyin South Railway Station In March 2019, the Group Engineering Research Institute vigorously carried out the exploration and development of the cast canopy according to the requirements of the 13th Five Year Plan for the Development of the Construction Industry and the Outline of the Advanced Planning for the Railway of a Transportation Power in a New Era of China Railway Group.

The overall service life is long, the maintenance is simple, and the maintenance cost is low in the later period.

Canopy structure calculation and analysis Low cycle reciprocating connection performance comparison test Scale model Seismic performance test Component production mode Canopy component processing can establish a component processing plant nearby the project.

The structural form of the fully assembled concrete canopy system based on the simply supported system is mainly divided into three components: beam, plate and column.

The cost of the precast concrete canopy is basically the same when the components are standardized, but the maintenance cost is greatly reduced.

The design team of the Group Engineering Research Institute conducts structural calculation and analysis, connection performance test and seismic performance test of the canopy under strong earthquake respectively.

It adopts double column and double cantilever cast structure.

The column root and the foundation, the column top and the upper support beam are connected through grouting sleeves, and the roof component and the support beam are simply connected through the support.

Later, it will be widely promoted and applied in Dongxing Station and other station buildings.

The requirements of the State Railway Group for fair faced concrete can be achieved without the need for priming and plastering.

In the process of R&D and trial use of precast concrete canopy, the leaders of China Railway Group paid full attention and affirmation, and further research and development of precast concrete canopy was raised as a research and development topic of China Railway Group.

Under the premise of being suitable for different projects, it replaces wood bamboo plywood with high material and energy consumption, saves a lot of scaffold turnover materials, responds to national environmental protection policies, and is conducive to the realization of low-carbon goals.

The overall production cost was greatly reduced, laying a solid foundation for the subsequent promotion of precast concrete canopy.

Contributed by: Railway Passenger Station Construction Research Institute of Group Engineering Research Institute..