前言一九七二年八月,在批林整风运动的推动下,我局古城砖瓦厂职工,在深入开展工业学大庆运动的高潮中,试制成功了空心挂勾砖新产品。为了对这种新产品进一步研制改进,推广使用,在市革委领导和有关部门的大力支持配合下,于同年十月,组织了以老工人为主,有设计、施工、生产单位参加的三结合试验小组,在古城砖瓦厂就地进行砌拱和建房试验。经过多次反复实践认识,建成了7.6米跨度的试验拱和同样跨度的晾瓦车间(见图10)。 Foreword In August 1972, under the impetus of the Forest Rectification Movement, staff of the Ancient City Brick and Tile Factory of the Bureau of Industrial Development successfully implemented new products for hollow-hooked bricks during the climax of the Daqing movement in industrial science. In order to further develop, improve, and promote the use of this new product, with the strong support of the leaders of the City Revolutionary Committee and related departments, in October of the same year, we organized the participation of the old workers, design, construction, and production units. In conjunction with the experimental team, arching and house building tests were conducted in the ancient city brick and tile factory. After repeated practice and recognition, a test arch with a span of 7.6 meters and a workshop with a span of the same width were constructed (see Figure 10).