The representative processes, advantages and disadvantages of each system are shown in the figure below.

Precast structural system and characteristics full precast shear wall load-bearing system precast shear wall external wall formwork system precast double-sided superimposed shear wall system there are two main factors restricting the precast structural system.

1 prefabrication rate and assembly rate at present, in addition to the unified provisions on the assembly rate in the national standard evaluation standard for precast buildings, Shanghai, Jiangsu, Beijing, Chengdu, Shenzhen, Hunan, Hubei and other provinces and cities have also successively issued detailed rules for the calculation of local prefabrication rate and assembly rate.

2 selection of cast structure system the common cast structure systems include fully precast shear wall bearing system, precast shear wall exterior wall formwork system, precast double-sided laminated shear wall system, etc.

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Plate Anchor

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However, there are differences in the scope of components included in the calculation of prefabrication rate (assembly rate) and the conversion proportion of prefabrication rate (assembly rate) of various components.

The common forms of thermal insulation include sandwich thermal insulation, internal thermal insulation and external thermal insulation.

Method 1 is only used for concrete structure, and method 2 can be used for concrete structure, steel structure and wood structure.

One is the building height.

Taking the calculation rules of prefabrication rate and assembly rate in Shanghai as an example, prefabrication rate refers to the ratio of the material consumption of precast components in the main structure and enclosure structure of precast buildings of concrete structure, steel structure, steel-concrete mixed structure, wood structure and other structural types to the total material consumption of corresponding components.

Non concrete precast components such as curtain wall, stone and gypsum board are not included in the prefabrication rate, and the infilled wall of interior wall is not included in the prefabrication rate.

Maximum applicable height of precast integrated structure house (m) common thermal insulation forms and characteristics 3 PC special design contents and key points in each stage scheme stage: PC special design in the scheme stage mainly includes the following contents: (1) determine the area proportion and prefabrication rate of precast building according to local policies and owner requirements; (2) select precast structure system (3) determine the type and floor range of precast components.

The scope of precast components in Shanghai only includes the main structure and exterior wall enclosure structure.

“Others” refers to the integration of structure and thermal insulation, the integration of wall and window frame, integrated wall, integrated floor and combined reinforced products.

The precast house with concrete structure can be calculated by two methods.

The specification lists two calculation methods: calculation method 1: prefabrication rate = volume of precast concrete components / (volume of precast concrete components + volume of cast-in-situ concrete) calculation method 2: prefabrication rate = ∑ (component weight) × correction factor × Precast components (proportion) × The following points should be paid attention to in 100% calculation: 1 Each single building above the floor area in Shanghai is taken as the calculation unit.

The second is the form of building thermal insulation.

In the selection of precast floors, the cast-in-situ floor structure should be adopted for the basement floor and roof floor of the house; For floors and structural transfer floors with large openings, cast-in-situ floor structure shall be adopted..

The characteristics of various thermal insulation forms and materials should be considered in the design.

When determining the type of precast components, It should be noted that the reinforced area at the bottom of shear wall structure should not be precast, the transfer beam and frame pillar of frame supported structure should be cast-in-situ, and the elevator shaft of high-rise should be cast-in-situ structure.

According to the provisions of the existing specifications, the assembled integral houses with different structural systems have the maximum applicable height limit.

Single building assembly rate = single building prefabrication rate + part assembly rate + other part assembly rate = ∑ (part weight) × Proportion of parts) × 100% of which, “part” refers to precast internal partition wall, unit curtain wall, integrated kitchen, integrated toilet, integrated pipe well and integrated smoke exhaust duct.

Assembly rate refers to the ratio of the quantity (or area) of precast components and building parts to the total quantity (or area) of similar components or parts in precast buildings.