Comparative analysis of advantages and disadvantages of three kinds of cast structures
The later transportation and hoisting costs are highly integrated: high, It is able to carry out three-dimensional modular design, integrating the integrated design of building structure and decoration and the convenience of construction and installation at the factory production site: it is complex.
The unit cost is much higher than the integration of concrete and steel.
The connection is the key to the wood structure.
What are the characteristics of these three types of structures? Main components of precast concrete structure (PC): precast reinforced concrete components.
If some cracks occur in the later stage, it is better to repair and apply: main components of precast wood structures of public buildings, industrial buildings and commercial buildings: load-bearing components of wood structures, wood components and components.
The water seepage situation is generally applicable: Phoenix International Media Center, a residential building, and the main components of tuyuan network cast steel structure (PS): steel member precast floor, exterior wall On site wet operation capacity of steel frame columns and steel beams: light components, which are basically mechanically connected by bolts or other metal accessories, low wet operation capacity, strong environmental protection of materials, recyclable cost of most components after disassembly: high material cost, but light components and modules, low transportation and hoisting costs, high degree of integration, capable of three-dimensional modular design, integrating building structure Convenience of decoration integrated design and factory production site construction and installation: it is more convenient.
The concrete components are not recyclable.
According to the data of 2020, the proportion of newly started precast concrete structure buildings is 68.3%, precast steel structure buildings is 30.2%, and precast wood structure buildings is 1.5%.
Due to the use of more superimposed cast-in-place technology, the construction joints are easy to crack, and it is difficult to remedy the cracks.
It can carry out three-dimensional modular design, integrating the integrated design of building structure and decoration and the convenience of construction and installation at the factory production site.
Most of the connecting nodes and gap connections are flexible, which is not easy to produce cracks.
Precast buildings are mainly divided into three types of structures: concrete structure, steel structure and wood structure, and there is a big gap in their actual proportion.
The design and construction requirements are strict, and the manufacturing and quality inspection are complex and applicable: tourism facilities, landscape Villas and other low rise buildings and small public buildings source: on the economic value of precast buildings, China Construction News, precast buildings..
The wet work volume is large.
The complex cost of reinforcement recovery process: the material cost is slightly lower than that of steel structure, but the component is heavy.
Many parts need to be reinforced on site and poured concrete.
Wet work volume on site: heavy components.
The environmental protection of materials is poor.
On site wet work capacity: light components, Less wet work, environmental protection of materials: renewable wood structure, recycling cost: long growth cycle of wood, lack of domestic wood; The wood structure has relatively high requirements in terms of design deepening, industrial splitting and construction technology.
