Assembled concrete is a concrete structure composed of precast concrete members, which are assembled, connected and partly cast-in-place.

Advantage:

1. Quality uniformity: Due to strict management and long-term production of factories, components with uniform and stable quality can be obtained.

2. Quantitative production: According to the standardization and standardization of components, it is possible to industrialize production and realize mass production.

3. Shortening the construction period: The main components of residential buildings can be assembled in the factory, which is 1/3 shorter than the traditional construction period.

4. Construction precision: Equipment, piping, window frame, outfitting and other components can be integrated production, can obtain high construction accuracy.

5. Cost reduction: Because of the mass production of construction industrialization, construction simplification reduces labor force, both of which can reduce construction costs.

6. Safety guarantee: According to a large number of tests and demonstrations, it has superior performance in earthquake resistance, fire resistance, wind resistance and durability.

The Ministry of Housing and Urban-Rural Construction is responsible for the management. The "Technical Standards for Assembled Concrete Construction" GB/T 51231-2016 and "Technical Standards for Assembled Steel Structures" GB/T 51232-2016, which were compiled by the China Academy of Architectural Standards Design (hereinafter referred to as "the Academy of Standards"), have been officially released and will be implemented on June 1, 2017. We invite Xiao Ming, the major compiler of the Technical Standards for Assembled Concrete Building, to interpret the structural system of the Assembled Concrete Standards for you.

Based on the characteristics and requirements of the assembly building itself, the assembly building technical standard pays more attention to the integration and integration of the building. It covers the whole profession and the whole process in the content of the standard, and creates a complete assembly building product through the integration of four major systems.

As an important technical content of the assembled concrete building, the main structure system has always been one of the key contents of the relevant standards of the assembled concrete building.

As one of the three important assembly building technical standards, the Assembled Concrete Building Technical Standard (GB/T 51231) (hereinafter referred to as "Standard") not only upholds the integration and integration characteristics of assembly building standards, but also takes into account the importance of structural system design.

Considering that the existing Technical Regulations for Assembled Concrete Structures (JGJ1-2014) (hereinafter referred to as the "Regulations") have already formed its own system in structural design, the newly compiled "Standards" in Chapter 5 "Structural System Design" mainly combines the scientific research results and engineering practice experience of recent years to supplement and improve the technical content and provisions of the Regulations, enriching and developing the assembly. Mature new technology and technology of type concrete structure.

The new supplementary technical content is still compiled in accordance with the technical framework of the Regulations to ensure the coordination and unification of the two. At the same time, in order to ensure that the new supplementary technical content is more complete logically and systematically, some important technical provisions of the Regulations are excerpted and guided.

Therefore, the contents of the Standards and Regulations avoid duplication and contradiction, and the relationship between them is coordinated, so that engineers and technicians can understand and use them clearly.

The design of prefabricated concrete structure system strives to be comprehensive, advanced and implementable.

1. To absorb the latest scientific research achievements and mature practical experience and enrich and improve them

Large Spacing Reinforcement Construction of Assembly Integral Frame Structures

Based on theoretical and experimental research and engineering practice experience, the spacing between longitudinal reinforcement and stirrups of frame beams and columns in "assembled monolithic frame structure" is adjusted and regulated to meet the requirement of large spacing reinforcement of prefabricated assembly structure in practical engineering.

Reinforced extrusion sleeve connection is a common form of mechanical connection. It is not only suitable for ordinary cast-in-situ concrete structures, but also for assembled concrete structures. It has the advantages of reliable connection, convenient construction, labor saving and site inspection of construction quality.

The Standard adds the connection form of extruded sleeve of steel bar to the design of structural system, supplements the general regulations and structural material requirements involved in the connection form of steel bar, as well as the structural regulations in the fabricated concrete frame structure and the fabricated concrete shear wall structure, which enriches the existing connection form of steel bar in the fabricated concrete structure engineering.

Slurry-anchor overlap connection, as a common form of steel bar connection in assembled concrete structures, has been widely used in China's assembled buildings in recent years. At the same time, related systematic research work has been carried out.

In the Standard, the concrete structural requirements of grouting anchor overlap connection in the area of edge member and reinforcement distribution of shear wall structure are specified.

In addition to the commonly used measures, the horizontal restraint reinforcement measures are added to the shear wall edge component area, which further enriches the form of the horizontal restraint reinforcement structures.

The relevant design regulations of double-sided composite shear wall structure are added, and the calculation and construction requirements of its structural design are clarified, which further enriches the existing assembled integral shear wall structure system.

The application of double-sided composite shear wall structure in our country is relatively small. In order to ensure structural safety, the maximum applicable height of double-sided composite shear wall and related structural measures in the Standard have adopted safety-biased provisions on the premise that relevant research and practical experience need to be further strengthened.

2. Consideration of factory processing technology and on-site construction workers