In order to avoid the maximum bending moment in the middle of the span at the slab joint, each slab span is set with 3 precast slabs.

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The roof layer and foundation of the project cannot be precast, so only precast laminated plates can not meet the requirements of 70% of horizontal components, so precast beams and stairs must be selected.

The joint design of variable cross-section column adopts the strategy of alignment on both sides or alignment on one side.

02.

② The project plane is an irregular quadrilateral, with multiple arc beams and some irregular plates.

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At the same time, considering the need to minimize the types of precast components and improve the degree of standardization, although the dimensions of slab spans are inconsistent, the size of one precast slab in the middle of each span is designed as 3200mm.

For precast columns, square columns with the same section size are preferred to facilitate production and construction.

The designed public bathroom has a large volume, and it is difficult to use dry construction on the ground.

Therefore, the equipment pipeline of the project is constructed by pipeline separation, and 6 points will be obtained.

④ the second floor of the project is planned to be a farmers’ market.

In order to meet the requirements of 35% of the application proportion of vertical members and facilitate the production and construction of members, variable section columns are preferred for precast member design, and columns with small section change of upper and lower columns and less than two levels of corresponding longitudinal reinforcement level difference are selected as far as possible.

The prefabrication range is from one floor to five floors, covering an area of 4112.01 square meters.

The single assembly rate is ≥ 60% (national standard), the main structure is ≥ 20 points, and the retaining wall and internal partition wall are ≥ 10 points.

Project summary: the assembly rate target of the project is clear.

ALC light partition wall is adopted as the internal partition wall, and 5 points will be obtained in the evaluation item of “non masonry of internal partition wall”.

⑤ The project adopts full decoration; 6 points.

In the selection of main beam and secondary beam, because the column has been precast for vertical components, and then the precast main beam, the joint structure is more complex and difficult to construct, so the precast secondary beam is preferred.

③ The external retaining wall of the project adopts curtain wall, which meets the two evaluation contents of “non load-bearing retaining wall non masonry” and “the integration of retaining wall with thermal insulation, heat insulation and decoration”, 5 points for each.

Design goal: meet the requirements of class a precast building.

Structural system: assembled integral frame structure.

Project information ★ Designer: contributed by Chengdu benchmark Fangzhong Architectural Design Co., Ltd.

A relatively stable and mature node change connection is adopted, and PC software can well assist the realization of the design intention of the project.

In the scheme design stage, factors such as indicators, structural scheme, degree of standardization and convenient construction are considered, and comprehensive scheme results are made.

03 precast column design the structural scheme of the project has a large number of columns, inclined columns and upper and lower variable section columns.

Round Bar Ferrule

The connection of variable section column is the difficulty of the project.

When the section contraction is required, the longitudinal reinforcement shall be bent into the cast-in-situ layer of horizontal members, or the bending offset shall be butted with the longitudinal reinforcement sleeve of the upper layer, so as to ensure reliable connection and construction safety.