Most of the wooden galleries in Jinan are used outdoors in bad conditions, and their cracking and deformation will be affected by many other factors, such as the place of placement, sunlight, humidity caused by natural phenomena such as rain and so on. We can't change the natural conditions, but we can control and avoid them in the construction.
Surface crack, inner crack and end crack will occur in the process of using antiseptic wood. Surface crack is mainly caused by high temperature and low humidity of medium. If it is to be avoided, the drying standard should be adjusted in time, the dry bulb temperature should be reduced, and the humidity should be increased. If necessary, surface steaming can be done
Internal cracking usually occurs in the later stage of drying, because the wood surface hardening is serious, and the internal tensile stress is greater than the transverse tensile strength of the preservative wood. To prevent it, more moisture control treatment should be carried out in the drying process to reduce the temperature in the later stage, or the preservative wood should be modified before drying, In order to reduce the evaporation area of water at the end of wood, the outer side of a partition strip at the outer end must be in a plane with the end of wood
In the construction of wooden Gallery, if possible, the existing size and shape of anticorrosive wood should be used as much as possible. Any processing of impregnated material, such as drilling, fine planing and cutting, will shorten the service life of impregnated material. It is suggested that hot-dip galvanized nails or screws should be used for connection and installation in construction. Drilling should be done in advance when connecting, so as to avoid cracking, Glue should be waterproof
Try to use more than grade II anticorrosive wood, because its moisture content is less than 20%, which can effectively prevent cracking and deformation. If the moisture content is more than 20%, then in the construction site, the stacking of wood should be 10-20 mm gap in each layer, and can be placed in the site for more than 72 hours before construction, And during this period to prevent direct sunlight. This can reduce the possibility of wood cracking