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为满足农民大量建房的需要,国家建材局苏州混凝土水泥制品研究院与无锡县水泥制品厂协作,研制成了适合全国推广的屋面基层构件——预应力钢筋混凝土双跨连续轻型屋面薄板(俗称望板)。这种望板已用于两幢试验性建筑和十幢商品房。经二年多的使用表明:望板结构安全,经济合理,施工简便,使用功能满足要求,受到了广大农民的欢迎。望板的规格尺寸可根据当地习惯开间和檩距选定。本次试验用的望板,长度为2440毫米,宽度为600毫米(包括预留的10毫米安装调节缝),厚度为27毫米。配筋根据望板的受力性能、所承受的正负弯矩和钢筋保护层的要求配置(见下图)。
In order to meet the needs of a large number of farmers building houses, the Suzhou Concrete Cement Product Research Institute of the State Administration of Building Materials cooperated with the Wuxi Cement Product Factory to develop a roof base component suitable for nationwide promotion—a prestressed reinforced concrete double-span continuous light roofing sheet (commonly known as Watch board). This kind of observation board has been used for two experimental buildings and ten commercial houses. After more than two years of use, it shows that the structure of the Wangban is safe, economical and reasonable, construction is simple, and the use of functions meets requirements. It has been welcomed by the majority of farmers. The size of the watch plate can be selected according to the local customs and spacing. The panel used for this test was 2440 mm in length and 600 mm in width (including a reserved 10 mm mounting adjustment slot) with a thickness of 27 mm. The reinforcements are configured according to the stress properties of the viewing plate, the positive and negative bending moments to be received, and the requirements for the reinforcing steel sheath (see figure below).