Gymnasium space frame roof construction
1、Project overview
The main body of the gymnasium is square in plan. It is an above-ground building with a total of 2 floors. There is a mezzanine on the main body of the building. During the construction of the gymnasium, to ensure the firmness of the internal structure of the building, reinforced concrete was used for the construction of its structure. , build it into a two-way crossed steel truss structure, because the structure is more stable, the roof panel is made of metal. The first floor of the gymnasium is the main stadium and functional rooms; the second floor is mainly the stepped stands. It is also a frame structure constructed with cast-in-place reinforced concrete. The plane size of the 1st and 2nd floors is 110.2m×97.2m, and the main column nets are 8.4m×8.4m, 8.4m×12.6m, 8.4m×15m. 2-story floor structure layout: the 12.6m×15.0m column network adopts the well-shaped beam layout, the main beam section is 400mm×1000mm, and the second beam section is 300mm×900mm; for the 8.4m×15m column network, the one-way straight line is adopted The beam layout method, the main beam section is 500mm × 1000mm prestressed beam, and the second beam section is 400mm × 1000mm prestressed beam. The purpose of this construction method is to ensure the uniformity of its force; The construction time is short, and the building function is adaptable.
The roof of the gymnasium is octagonal, the plane length is 69.3m×69.3m, the roof span is 67.2m×67.2m, and the peripheral column spacing is 8.4m. To meet the requirements of the architectural effect, combined with the characteristics of the column network, the roof adopts a two-way orthogonal 45° inclined steel truss structure system, and the two-way steel truss is supported on the top of the surrounding columns. The trusses are placed diagonally, and the lengths of these trusses are also different, but the heights are the same.
In the construction process, trusses with different stiffnesses are used in different parts of the building, and trusses with high stiffness are used near the corners. In the case of peripheral support, they have higher stiffness and less material consumption than the two-way orthogonal truss. Reduced truss height. According to the equipment maintenance requirements, an inspection horse track is set in the lower chord plane of the roof. Combined with the characteristics of the building roof slope, a horse track is set along the two diagonal slopes of the plane. Some trusses cancel the inclined web bars in this slope width range to form an empty truss. The vertical rod of the truss is connected with the upper and lower chords by a rigid connection to ensure the bearing capacity of the truss. In addition, according to the requirements for the arrangement of lighting windows on the roof of the building, horizontal support is arranged on the upper chord plane between adjacent trusses. The outer diameter of the chords of the roof tube trusses of the gymnasium is the same, the building is beautiful, and there is no need for a suspended ceiling.
2 、Engineering features and scheme selection
During the construction of this project, it is built into a square quadrangular pyramid bolt ball structure. The support method used by the main body of the building is the bottom chord point support, and its construction advantage is to increase the overall span of the building. In the process of high-altitude bulk loading of the space truss, there is no need to use a tower crane. When installing the space frame, a pull rod and an electric winch should be used, which can improve the safety and efficiency of the installation. In the process of control of construction quality, the organization of interspersed construction is the focus of the construction organization of this project. According to the engineering drawings and on-site investigation of the actual situation, the 1-axis to 2-axis of the gymnasium roof is built into a concrete structure, the height of which is the same as the height of the embedded parts, and the 2-axis to 3-axis space frame is connected to the 1-axis to 2-axis. The roof of the shaft, the roof of this project is this structure. After splicing, move it to the installation position, and then fix it. The remaining space frame is constructed by the method of small unit ground assembly pulling rods and electric winches at high altitudes. In this way, the quality of the project can be guaranteed, and only a small amount of scaffolding is needed, which is conducive to shortening the construction period and saving costs.
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