Among them, the consideration of precast construction cost is the focus of discussion among major developers.

It can be seen from the above table that the plot ratio reward area of scheme I and scheme III is the same, but the net value obtained by scheme III (net value = relative tradable increment of traditional buildings – relative increment of traditional construction cost) is the highest, that is, the profitability of the project is the highest.

Reduce the interspersed construction and embedding of horizontal component pipelines; Disadvantages: the same as 3 and 4 in scheme 2, and some internal shear walls need to be selected to make the prefabrication meet the application index.

Partial prefabrication of stressed components at the edge of shear wall with door and window openings shall be considered 3 The influence of hardbound unit, construction unit and equipment discipline on the vertical reinforcement layout of shear wall needs to be comprehensively considered, and the participation of each unit in the early stage is high; 4.

The construction of water and electricity pipelines in the superimposed floor slab is easy to make the slab thickness out of tolerance, and the construction in the pipeline concentration area is difficult.

This provision has played a great role in reducing the cost of developers, so the scheme cost analysis of the project also takes into account the part of plot ratio reward.

Disadvantages: 1 The cost of precast enclosure wall (with beam) components is high; 2.

Cost analysis of three schemes the project is located in Wuhan, Hubei Province.

Save the amount of horizontal component formwork on site; 3.

But at the same time, there are many voices of doubt.

With the rise of architectural industrialization, the market share of precast buildings is increasing in recent years.

It has little impact on the foundation and bottom business.

So is this really the case? Why do many projects in Wuhan begin to gradually increase the frequency of making vertical components, and some developers also begin to slowly accept vertical components? To find the answer to this question, we should return to the cost problem that developers are most concerned about.

Fixing Socket Cross Pin

The cost of the tower crane of the construction unit needs to be increased.

The external wall plot ratio reward of the project cannot be full;                  ; Advantages of scheme III (precast shear wall + precast enclosure wall): 1 The area reward is easy to get full; 2.

In order to save cost, developers are more willing to do horizontal components and avoid vertical components.

The cantilever frame shall not be selected for the external protective frame as far as possible, and the climbing frame and other factors shall be considered; 5.

The combination of the two components not only ensures that the plot ratio of the project can reach 3% to the greatest extent, but also relatively reduces the prefabrication scope of the shear wall, reduces the construction difficulty, reduces the impact on the bottom quotient, and further saves the cost…

According to the policy statement of Wucheng Jian GUI [2020] No.

Therefore, the precast building scheme of the project adopts the combination of scheme III, precast shear wall and precast enclosure wall.

Advantages of scheme I (precast horizontal components + precast retaining wall): 1 The technology of horizontal components is mature, the construction difficulty is small, the technical requirements are low, and the on-site construction management is controllable; 2.

This paper takes a precast building project in Wuhan as an example to find the answer to this question for readers.

Reduce on-site reinforcement binding and beam support modulus; 4.

Precast shear walls are used for those with large selectivity and small influence of gables on both sides on the basement foundation, and precast enclosure walls are used for balconies and bay windows, which combines the advantages of precast walls in the first two schemes; 3.

The number of components is small, the construction tower crane takes up less time and the hoisting times are less; Disadvantages: 1 The setting of shear wall needs to consider the influence on the bottom quotient; 2.

Three kinds of precast schemes provide three design schemes for the precast components selected for the building: scheme 1 (horizontal components + precast enclosure wall); Scheme II (precast shear wall); Scheme III (precast enclosure wall + precast shear wall); The detailed distribution diagram is shown in the following figure: scheme I (horizontal components + precast retaining wall): scheme II (precast shear wall): scheme III (precast shear wall + precast retaining wall): analysis of the advantages and disadvantages of three schemes.

Compared with the traditional method, the plate thickness needs to be increased; 3.

Advantages of scheme II (precast shear wall): 1 The application proportion is low, and the contribution of assembly rate score is large;                2.

1 document, the horizontal projection area of the precast part of the outer wall (no more than 3% of the building area above ± 0 of the precast building monomer) is not included in the plot ratio accounting policy of the traded plot.