河南省商丘地区位于黄河中下游冲积平原,粘土层很薄,可供制砖的粘土层厚度只有0.5～1.6米,平均采掘深度1米,下面都是低塑性砂质土。如果采用传统工艺,这种土不适合制砖。目前,全地区有粘土砖厂481个,总占地面积7.4万亩。其中已挖毁的土地有2万多亩。1985年,地区产砖25亿块,挖毁土地8330亩,平均生产1亿块砖,毁地330亩。为保护农田,节约土地,商丘地区乡镇企业局,从1985年开始研究利用废窑坑底层的低塑性砂质土制砖。经过一年多的试验,获得了成功,取得了节约土地和降低生产成本的效 The Shangqiu region of Henan Province is located on the alluvial plain in the middle and lower reaches of the Yellow River. The clay layer is very thin. The thickness of the clay layer for making bricks is only 0.5 to 1.6 meters. The average mining depth is 1 meter. The following are all low plastic sandy soils. If traditional techniques are used, this soil is not suitable for brick making. At present, there are 481 clay brick factories throughout the region, with a total area of ​​74,000 mu. Among them, more than 20,000 mu of land have been destroyed. In 1985, 2.5 billion blocks of bricks were produced in the area, 8330 acres of land was destroyed and destroyed, and an average of 100 million bricks were produced, destroying 330 acres of land. In order to protect farmland and save land, the Township Enterprise Bureau of Shangqiu District began to study the use of low-plastic sandy clay bricks at the bottom of waste kiln pits since 1985. After more than one year of trials, it has been successful and has achieved the effect of saving land and reducing production costs.