With the continuous advancement of society, it has also driven the development of the construction and decoration industries. The large-scale building curtain wall design is very beautiful everywhere. The building curtain wall is the product of modern building science, new building materials and modern building construction technology. At present, the stone used in stone curtain wall has an annual average of more than 25 million m2. However, the stone also has obvious shortcomings and shortcomings. For example, the stone curtain wall is of high quality first; secondly, its safety is worth considering; finally, the fire performance of the stone curtain wall is not good, which seriously affects people's lives.
First, the general provisions of stone curtain wall structure design
1. The stone curtain wall is designed according to the external protection structure. The stone curtain wall slab should be made of igneous rock.
2. Natural stone curtain wall should not be used in high-rise and super high-rise buildings. When the design requirements are adopted, the anti-fragmentation measures of the stone shall be added in accordance with the relevant regulations.
3. The skeleton of the stone curtain wall should be designed in consideration of the effect of the building facade, the structure of the civil structure, and the installation form of the stone curtain wall. It is necessary to ensure the safety of the curtain wall system and the feasibility of the construction process. 4. Stone The curtain wall and its joints should have sufficient bearing capacity, rigidity and displacement capacity relative to the main structure. The column of the curtain wall skeleton shall be connected to the main structure through the metal corner code. The bolts shall be connected between the column and the corner code. The bolt pads shall be protected against loosening and anti-slip.
5. Stone wall with non-seismic design, the stone should not be damaged under the action of wind; the stone curtain wall with seismic design can still be used after being repaired under the action of fortification intensity earthquake; the curtain wall skeleton can not fall off under the action of rare earthquake.
6. In the design of stone curtain wall components, the safety of the curtain wall system under the influence of gravity load, wind load, earthquake action, temperature action and main structure displacement should be fully considered.
Second, the common mistakes in the design of stone curtain wall structure
1. The pre- (post) embedded parts are placed on the masonry structure or the lightweight partition wall.
In the "Technical Specifications for Metal and Stone Curtain Walls" (JGJ133), the concrete strength of the main concrete members connected to the curtain wall columns should not be lower than C3O. Refer to the Technical Specification for Glass Curtain Wall Engineering (JGJ 102): When the curtain wall is connected with the masonry structure, it is advisable to add reinforced concrete or steel structural beams and columns to the main structure of the joint. Lightweight infill walls should not be used as a support structure for curtain walls. The masonry structure has poor plane support ability, and the lightweight partition wall has poor bearing capacity and deformation ability, and can not be used as the support structure of the curtain wall. For the floor with a higher floor height, the designer solves the problem of the force of the curtain wall column. In addition to increasing the cross-section size of the pole or using high-strength materials, some projects add a support point to the wall between the floor structural beams. This support point should be reliable and effective on reinforced concrete (or steel structure) structural beams (columns).
2, keel all welding
In the Technical Specification for Metal and Stone Curtain Wall Engineering (CJ 133), the beam and the column are bolted. It is mandatory that the welding is not allowed. However, in the engineering, all welding structures are often used. On the technical level, welding is feasible; At the current specification level; welding must be prohibited. From a technical point of view, one end of the beam is welded, and the other end of the bolt connection is a better case:
3, T-shaped pendant and butterfly buckle pendant
These two kinds of pendants have a high market share, the price is relatively cheap, and the flatness is good. However, after the installation is completed, a large continuous and non-displaceable wall surface is formed. On the one hand, the maintenance and replacement are difficult, on the other hand, the wind resistance, The anti-seismic performance is poor. It has been clearly unsuitable for use in the "Building Curtain Wall" (GB/T21086-2007). In the vibration and seismic test, it is also found that the type of pendant has defects.
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