8 precast subway stations have been built and 10 are planned to be built; Qingdao Metro is building 6 precast metro stations; Shenzhen Metro is building 6 precast metro stations.

Carry out the mechanism supporting design for the reverse production mold of component A, and its mechanism schematic diagram is shown in Figure 4.

Due to the short length of component B, the assembly line can produce 2 molds with 1 bottom mold.

The outer frame structure is composed of four precast members with a ring width of 2.0m, a length of 24.5m and a height of 5.0m, which are assembled by on-site splicing.

The cover plate is installed one by one according to the pouring progress.

The clamping accuracy of each mold is ensured by positioning device between end mold and side mold, end mold and side mold and bottom mold, cover plate and end mold.

Key words: precast subway station; precast component; Mold; Design; Industrialization 0 Preface At present, the construction of the main structure of the traditional subway station basically adopts the cast-in-place method, which has the disadvantages of poor on-site working environment, low production efficiency, high labor intensity of workers, large occupation of space, large waste of resources, large environmental impact, and many hidden dangers of production safety.

Changchun Metro Line 2 project is the first application of precast structure construction technology for subway stations in China.

The width of the station assembly structure is 22.3m, and the length of the assembly section is 164m, which is composed of 762 precast components, and the overall assembly rate reaches 70%.

1.2 Technical requirements (1) Processing accuracy of bottom mold: dimension deviation in length direction is ± 0.5mm, and dimension deviation in width direction is 0.2mm.

(2) Mold roughness: the surface roughness of the mold in contact with the concrete shall not be greater than Ra3.2.

The auxiliary structure inside the station also adopts precast assembly structure.

Under the condition of attaching importance to the quality of components, it is proposed to adopt the reverse production mold.

The schematic diagram of the mold of the forward and reverse production plans is shown in Figure 2, and the corresponding finite element analysis of the mold is shown in Figure 3.

At the same time, the disadvantages of the traditional construction industry have become increasingly prominent.

When producing components of the same specification, only one set of side formwork is required for this structure, and multiple sets of bottom formwork and end formwork are used for production (see Figure 5), which reduces the amount of steel used for the mold and reduces the initial investment.

(4) Panel flatness: the flatness of side formwork and bottom formwork panels shall not be greater than 0.2mm/m, and the length direction shall not be greater than 2.0mm.

Design and Engineering Application of Precast Component Mold in Assembled Metro Station Zhang Jinjian, Wang Yantao, Pang Ling, Liu Xiaokai (Qingdao Universal Heavy Industry Technology Co., Ltd., Qingdao 266427, Shandong) Abstract: In order to improve the industrialized production level of precast assembly in subway station, combined with the technical requirements of Shenzhen Metro Line 16 project, the stress analysis of precast component mold in precast metro station is carried out based on finite element software, The optimal structural design scheme of the die was determined.

Based on the consideration of component forming quality, the quality of the joint surface, tenon, internal and external camber and cup mouth of the two ends of the component formed by the reverse production mold is better, and the supporting cover plate of the mold is less, and the lifting distance of the hopper is shorter.

The quality of construction mainly depends on the quality of construction personnel, and the degree of industrialization is relatively low.

With its obvious advantages over traditional buildings, precast buildings will become the only way for the transformation and upgrading of China’s construction industry.

The end form is translated and closed through the track fixed on the bottom form, and the side form is closed through the hydraulic automatic opening and closing system.

In recent years, with the rapid development of the economy and the renewal of the development concept, people’s demand for the quality of buildings has increased significantly.

1 Project overview and technical requirements 1.1 Project overview Traditional Chinese Medicine Hospital Station is one of the first seven precast pilot stations in Shenzhen Metro.

This paper focuses on the structural design of component A, taking into account the difficulty of component production, Combined with the finite element analysis of the mold, the mold of the forward and reverse production plans are compared and selected.

Component A is the bottom block of precast metro stations, which is the foundation of the whole ring assembly, and its quality directly affects the assembly quality of the whole ring.

Bubble Panel Pad

The end form and bottom form are transferred to the pouring station along with the base on the assembly line.

2 Mold structure design Due to the different block structures of precast metro stations, the design process should fully consider the mold operation, molding quality of precast parts, component demoulding, lifting, storage and transportation, and other conditions.

See Figure 1 for the main structure of the station.

Compared with the forward production mold, the component forming quality is better, and the pouring is more convenient.

(5) The mold inspection points shall be permanently identified.

As an urban underground structure, precast subway stations will have far-reaching significance for urban rail transit in China.

It can be seen from Figure 4 that the A component mold is suitable for the base of assembly line production, and the base includes bottom mold, side mold, end mold and removable cover plate.

The engineering application shows that the precision of the precast component mold designed for the precast subway station meets the relevant requirements, which can provide a reference for the industrial production of similar precast subway stations.

It can be seen from Figure 3 that under the same working condition, the stress level of forward and reverse production dies is basically the same.

Component C is similar to component A production mold, and its mold structure is shown in Figure 6.

The station roof adopts a single flat roof structure with a weight of 120t.

Combining with the Shenzhen Metro Line 13 project, according to the specific technical requirements of the project, this paper uses finite element software to carry out stress analysis on the mold, and determines the optimal structural scheme through scheme comparison, so as to ensure the production accuracy of precast components of the precast subway station, and intends to provide a reference for the development of China’s rail transit construction technology towards equipment, intensification and industrialization.

(3) Blanking accuracy: all parts used in the mold are cut by laser, with a dimension deviation of ± 0.2mm.

As a new construction method, the super-large components required for precast metro stations are precast in the factory and then transported to the construction site for assembly.

See Figure 7 for the mold structure diagram..