Ferrule Insert

The implementation of precast buildings has become the inevitable trend of the development of China’s construction industry.

Background of the precast building structure building example project: the total land area of the project is 66398.84 ㎡, the plot ratio is not greater than 2.5, and the total building area is 217527.86 ㎡, of which the total aboveground building area is 165965.77 ㎡, and the building height limit is 100 meters.

The definition of precast building and three important indicators; 2.

How to be economical and reasonable is the top priority of this plan, and the assembly rate, as the main measure of the degree of building assembly, will directly affect the final economic indicators of the project.

And the steel structure does not need cast-in-place borrowing points, which is conducive to the construction speed and quality.

First of all, the proportion of precast building area refers to the proportion of precast building area in the total building area.

Opportunities and challenges with the continuous development of the construction industry, the state pays more and more attention to the energy and environmental issues of the construction industry.

Theoretically, it is the cost optimal scheme.

The assembly rate of this project is required to comply with the national standard, and the scoring rules are consistent with the national standard.

In order to vigorously promote its development, various regions have successively issued precast construction policies with different requirements, and the proportion of precast building area, assembly rate and other indicators have a trend of increasing year by year.

1.

Since the State Council issued the green building action plan in 2013, the state has intensively issued policy documents on the promotion of precast buildings, which has promoted the vigorous development of precast buildings to the national strategic level.

Therefore, it is more reasonable to use steel structure for both buildings.

Concrete prefabrication rate refers to the volume ratio of the concrete consumption of precast components in the main structure and maintenance structure above the outdoor floor of industrial buildings to the total concrete consumption of the corresponding part.

Reasonable assembly rate of cast steel structure building; 3.

According to different assembly schemes, the corresponding concrete prefabrication rate can fluctuate around 20% – 30%.

The project needs to meet the requirements of “the precast building area is not less than 15% of the total building area on the ground, of which the steel structure building area is not less than 7% of the total building area on the ground”.

At the level of structural safety, the vertical members are connected by grouting sleeves, which can not guarantee whether the grout is full or not, on the other hand, the current detection methods can not guarantee whether the connection is reliable under the action of earthquake.

Next, the application of cast steel structure is introduced with a practical project case.

In recent years, the government has been committed to accelerating high-quality green development in housing construction and promoting the transformation and upgrading of the construction industry.

Step 2: the assembly rate scheme of 100% steel structure deduces that steel structure is a natural precast building, but there are also practical problems such as high steel content and high construction and installation costs.

2.100% steel structure in this scheme, the structures of the two buildings are steel structures, which can avoid the differences between the two buildings and better unify the general layout and house type design.

Implementation details of structural system, enclosure wallboard and equipment reservation and embedment of precast steel structure building.

Moreover, the construction accuracy of precast concrete structure is high, and it is easy to have construction defects.

Starting from the definition, this paper analyzes the related concepts and main indicators of precast buildings.

The details are as follows: the first step of scheme comparison: first, meet the requirements of 15% of the precast area.

There are two possibilities of combining strong drainage.

The assembly rate must be scored according to the score table of precast buildings in the national standard, the steel columns and steel supports in steel structure buildings are finished steel members, accounting for 100% of the vertical members, so the score of the main structure part is at least 30 points..

However, if a building adopts steel structure and a building adopts precast concrete structure, it is not conducive to general layout planning and house type proportioning design.

Among them, the national standard evaluation standard adopts the monomer assembly rate as the scoring principle, and the monomer assembly rate is required to be no less than 50 points, of which 36 points are fixed item scores.

According to local policies and planning conditions, the project needs to meet the requirements of “the precast building area is not less than 15% of the total building area on the ground, of which the steel structure building area is not less than 7% of the total building area on the ground”.

1.50% steel structure and 50% precast concrete structure.

There are three main indicators closely related to precast buildings: the proportion of precast building area, the assembly rate of precast components, and the prefabrication rate of concrete.

However, the opportunities and challenges associated with concrete precast buildings are becoming increasingly obvious: in terms of construction efficiency, the self weight of precast shear walls is large, and there will be obvious hoisting difficulties when constructing to high-rise buildings; The vertical members are connected by grouting sleeves, which requires high construction accuracy; And the post grouting can only be judged whether it is full by the naked eye on site, which is prone to artificial construction defects and affects the detection efficiency.

In this scheme, the two buildings adopt steel structure and concrete structure respectively, which meet the lower limit requirements of the policy.

At the same time, combined with the actual project, the assembly rate scheme and implementation details of precast steel structure building are analyzed.

Secondly, the assembly rate of precast components refers to the comprehensive proportion of precast components used in the main structure, enclosure walls and internal partitions, decoration and equipment pipelines above the outdoor floor of a single building.

Steel structure is a natural precast building, which has the advantages of “light, fast, good and economical”, and is widely used in large plants, venues, super high-rise and other fields.

In this article, you will gain: 1.

In recent years, with the innovation and improvement of steel structure system, the application of steel structure in civil housing has been gradually promoted.

Is there a structure that can not only meet the requirements of high assembly rate of the policy, but also ensure reasonable force transmission and reliable connection of the structure? This is the “protagonist” of this paper – precast steel structure building.

What is the definition and three indicators of precast building? Precast building refers to a building that transfers a large number of on-site operations in the traditional construction method to the factory, processes and manufactures building components and accessories (such as floors, wallboards, stairs, balconies, etc.) in the factory, transports them to the construction site, and assembles and installs them on site through reliable connections.