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目前,国外生产的空心砖基本上有竖孔的和水平孔的两种。竖孔空心砖的保温性能远比水平孔的良好,机械强度也高,因此有取代后者的趋势。竖孔空心砖的形式很多,就孔状而言,有圆形、橢圆形、三角形、菱形、正方形等;就孔数而言,有三孔、四孔、五孔、六孔、七孔、八孔……以至于一百多孔。瑞士是生产和使用空心砖最广泛的国家。从本世纪二十年代以来,它的空心砖的使用,遍及各工业部门,而实心砖却几乎只作砌筑窑炉和管道。在瑞士,使用最广泛的为七孔空心砖(图1)。砖内有七个平行的宽12毫米、
At present, the hollow bricks produced abroad have basically two kinds of vertical holes and horizontal holes. The insulation performance of the vertical hole hollow brick is better than that of the horizontal hole, and the mechanical strength is also high, so there is a tendency to replace the latter. There are many forms of vertical hollow bricks, in terms of holes, there are round, oval, triangular, diamond, square, etc.; in terms of the number of holes, there are three holes, four holes, five holes, six holes, seven holes, eight Hole ... ... that is a hundred holes. Switzerland is the most extensive country in the production and use of hollow bricks. Since the 1920s, the use of hollow bricks has spread throughout the industrial sector, while solid bricks have almost exclusively been used as masonry furnaces and pipes. In Switzerland, the most widely used is a seven-hole hollow brick (Figure 1). There are seven parallel widths of 12 mm in the brick.