小青瓦屋面是我国劳动人民创造的具有冬暖夏凉、维修简便、广大农村和中小城镇较为理想的一种屋盖结构。长期来,各地普遍使用断面为70×30的桷子(图1),现行《建筑工程预算定额》中也是按70×30来计算的,这种断面的桷子,由于宽度不够理想,虽能保证槽瓦沟宽140,但盖瓦必然搭入瓦沟,占据沟的断面,致使暴雨季节流水断面不够引起漏雨。如改用100×25断面的桷子(图2),根据历年在住宅、学校、俱乐部等工程的实际应用,证明由于桷子宽度增大,使屋盖具有如下优点: 1.盖瓦亮沟,瓦沟流水断面增加(f>f_x),不易堵塞,排水畅通,从而减少翻盖屋面的次数,提高使用寿命,节省房屋维修 Xiaoqingwa roof is a kind of roof structure that is created by the working people of our country and is ideal in the winter and summer, cool, easy to maintain, and the majority of rural and small and medium-sized towns. In the long term, 70×30 rakes are commonly used everywhere (Figure 1), and the current “Budget of Building Project Budget” is also calculated as 70×30. Since the width of this section is not ideal, it can It is ensured that the slot width of the slot is 140, but the girders will inevitably enter into the gutter and occupy the cross section of the gully, resulting in insufficient leakage of the flowing water in the rainy season. For example, instead of using 100×25 sections of dice (Fig. 2), according to the practical application of the projects in residences, schools, and clubs over the years, it has been proved that due to the increased width of the dice, the roof has the following advantages: The cross section of the tile trench is increased (f>f_x), and it is not easy to block and the drainage is unblocked, thereby reducing the number of clamshell roofs, improving the service life, and saving the house maintenance.