贴砾滤水管是一种新型的水井过滤器,是用人工合成树脂将合适的砾石,经过特殊的加工工艺,贴在花管的外面(见照片1)。贴层厚度约10～18毫米,孔隙率在20%以上。因为这种滤水管具有较高的技术经济价值,所以西德、美、日等国发展很快,并把这一技术定为专利出售。 1979年元月初,我们初步研制成这种贴砾滤水管,并在宁河县板桥公社东双庄 The gravel filter pipe is a new type of well filter, which is made of synthetic resin and suitable gravel. After a special processing process, it is attached to the outside of the flower pipe (see photo 1). The thickness of the coating is about 10 to 18 mm, and the porosity is more than 20%. Because of the high technical and economic value of such a water pipe, West Germany, the United States, Japan, and other countries have developed rapidly and have established this technology as a patent for sale. At the beginning of January 1979, we initially developed this pebble filter pipe and it was built in Banqiao commune of Donghe County.