PC technology Precast concrete component technology
By researching customer needs and product stereotypes, and then achieving factory prefabrication and on-site assembly production methods, the purpose of improving product quality performance is to improve product production efficiency.
PC technology brief
In China, there has been the application of this kind of PC, but there is no corresponding technical norms and policy support. So how to integrate and match foreign advanced technology with China's existing design standards, and finally cooperate with relevant departments to form industry standards. It is necessary for the design unit to make a lot of research and test work through the parts factory and the construction site, in order to truly master the technology and apply it extensively in domestic engineering.
Hong Kong PC Technology
In order to support the implementation of residential industrialization, the Hong Kong government has a 10 percentage point discount on the floor area ratio of projects using PC technology than non-PC systems. At the same time, the Buildings Supervision Department of Hong Kong is dedicated to quality control and quality supervision of PCs.
The intuitive feeling of visiting the basic situation of the PC residential project in Tai Kok Tsui, Hong Kong: more than 50 residential buildings in the whole community, each with 58 floors of super high-rise residential buildings, 8 households per unit, all using standard PCF external wall system, rough The project is estimated to have a construction area of 2 million to 3 million square meters.
A rough comparison between the Japanese model and the Hong Kong model
1, PC application range comparison
Hong Kong PC structural components mainly include balconies, stairs, bay windows, air-conditioning panels and PCF wall panels. They are mainly used in high-rise residential buildings and apartments, mostly based on shear wall structure systems; PC components for beams, columns and floors Currently, it is only used for a small number of frameworks such as primary and secondary schools with less than five floors.
There are not many restrictions on Japanese PC structural components. In addition to balconies, stairs, bay windows, air-conditioning panels, and PCF wall panels, beams, columns, and slabs, including the entire bathroom and the whole kitchen, can be used. The use of PC does not simply refer to which components, but to the percentage of PCs used, such as 80% PC, or even 100% PC, the entire building is assembled.
2. Comparison of the methods of component reinforcement
The PCF components of the Hong Kong model use ordinary straight anchored ribs. The concrete slabs have no reinforced structure. The rigidity of the prefabricated components is small and the strength cannot be guaranteed. Cracks and large deformations will occur during construction and transportation. Reinforcement equipment prevents damage to components, which increases construction costs.
Straight anchored steel bar is an open type of tie-bar, which is relatively simple in construction and is only suitable for use in non-seismic areas such as Hong Kong. Through inspections in Hong Kong, the thickness of the PCF board is 100mm.
The Japanese-style PCF component adopts vertical and horizontal two-way truss ribs to ensure that the prefabricated components have sufficient rigidity and strength during the process of stripping, transportation, lifting and storage, without cracks and excessive deflection deformation, and the truss rib is a kind of closure. The type of pull-up S-rib can make the prefabricated component and the main structural component overlap more firmly, has stronger integrity, has good earthquake resistance, and is suitable for use in earthquake-resistant areas.