Aluminum doors and Windows of the bridge are required to prevent leakage 

　　1.外窗必须设置排水通道、排水口、排气孔（气压平衡孔），排出窗框扇内积水。排水口外侧应设扣盖，防止强风将雨水、灰尘吹入窗扇。

1. The external window must set drainage channels, drain holes and vent holes (air pressure balance holes), and discharge the water in the window frame fan. The outside of the drain should be buttoned to prevent the strong wind from blowing rain and dust into the Windows. 

　　2.隔热条应采用C型构造，与内外铝型材复合后在同一个水平面上，避免隔热条处积水造成渗漏、腐蚀隐患。同时可增加隔热条长度，提高热工性能。

2. The insulating strip shall be constructed of C type, which shall be in the same horizontal plane as the inner and outer aluminum profiles, so as to avoid water leakage and corrosion risks in the heat insulation bars. At the same time, it can increase the insulation length and improve the thermal performance. 

　　3.门窗洞口尺寸：结构洞口预留不应过大，避免封堵困难造成渗漏隐患。

3. The size of the door and window openings: the structure hole should not be too large, so that the leakage can be avoided. 

　　4.企口：窗洞为特殊原因，如外墙为石材幕墙，洞口预留尺寸大，结构洞口建议做企口，企口应与混凝土墙同时浇筑。

4. Tongue-opening: the window hole is for special reasons, such as the outer wall for the stone curtain wall, the hole is reserved for large size, the structure hole is recommended to do the enterprise mouth, the enterprise mouth should be poured in the concrete wall at the same time. 

　　5.外窗台板：外墙材料为涂料的建筑，建议采用金属窗台板。金属窗台板内侧应压入窗框，外侧突出墙面做滴水。