We can imagine pre made components such as beams, slabs, columns, and walls as LEGO blocks, and simply assemble them together at the construction site. “Assembly” is not just about “assembly”. After the prefabricated components are transported to the construction site, they will be overlapped and poured with reinforced concrete. This “industrialized” and “industrialized” construction has been widely adopted in Europe, America, and Japan..

Prefabricated housing refers to the process of prefabricating some or all components of a residential building in a factory, transporting them to the construction site, and assembling them through reliable connections..

All construction of traditional residential buildings must be completed on the construction site, while prefabricated residential buildings can be produced in factories and installed on the construction site..

For example, your balcony, bay windows, and stairs have all become parts of the factory and need to be integrated in advance. When building the house, they can be directly hung up and assembled..

Even the floor slabs, columns, and beams are pre made in the factory and only need to be installed on the construction site, but this tests accuracy and cannot have any errors..

After the prefabricated stairs, exterior walls, etc. are transported to the construction site, they also need to be overlapped with reinforced concrete, not simply connected. Steel bars run through every structural component such as floor slabs and columns, making the building structure very sturdy..

Prefabricated buildings have advantages such as high construction quality, fast project progress, and environmental protection, making them highly popular..

The industrialization of construction in Japan has gradually developed in the process of meeting the demand of the housing market and continuously improving the quality of housing..

Lifting Foot Anchor

According to incomplete statistics, in the 1940s, Japan had a housing shortage of 4.2 million households, accounting for 1/4 of the population at that time..

In order to solve the problem of “housing shortage”, the Japanese government has begun to use the method of producing residential buildings in factories for large-scale residential construction. It was not until the early 1960s that the housing problem was alleviated..

Subsequently, residential construction in Japan gradually shifted from a simple pursuit of quantity to a balance between quantity and quality, and then to a comprehensive development in multiple aspects, and achieved rapid development with strong government support..

After nearly 60 years of development, Japan’s housing industry has formed a relatively complete system and is one of the most mature countries in terms of housing industrialization..

Japan divides prefabricated houses into iron and steel prefabricated houses, modular prefabricated houses, wooden prefabricated houses, and concrete prefabricated houses..

The industrialization of Japan’s main structure is mainly based on prefabricated prefabricated concrete PC structures, and steel integrated and wooden structures are also widely used in multi story residential buildings..

PC structured residential buildings have gone through a development process from WPC (precast concrete wall panel structure) to RPC (precast concrete frame structure), WRPC (precast concrete frame wall panel structure), and HRPC (precast concrete steel hybrid structure). The specific development diagram is shown in the following figure..

The Japan Housing Federation has built temporary housing for disaster victims at the request of provincial governors. Such as the Hanshin earthquake, the Usu Mountain volcanic eruption, and the East Japan earthquake..

The Japan Housing Federation has signed construction agreements with 47 prefectures in Japan for temporary housing during disaster periods. The following table shows the number of disaster relief houses built in each year since 1995..

The exterior wall tiles have been completed in the factory along with prefabricated components, which is different from the usual practice in China.