1.开泥孔口径:必须根据井管和滤水层厚度而定。一般的孔径应大于井管外径20厘米,保证滤水层有适当的厚度。

1. aperture of mud opening: it must be determined according to the thickness of the well tube and the filter layer. The general pore size should be greater than 20 cm outside the pipe diameter to ensure the proper thickness of the filter layer.

2.多孔水泥滤水管的规格及安装位置:主要根据当地含水砂层条件而定。滤水管骨料(砾石)粒径,应大于16~20倍的含水砂层平均粒径。而砾石滤水层的平均粒径应则大于8~10倍的含水砂层平均粒径。

2. the specification and installation position of porous cement filter pipe: mainly depending on the conditions of the water bearing sand layer. The particle size of the filter pipe aggregate (Li Shi) should be larger than the average particle size of the water bearing sand layer with 16~20 times. The average particle size of the gravel filter layer should be larger than the average particle size of the water bearing sand layer with 8~10 times.

3.井型和井管口径:主要根据抽水设备类型、规格而定。有时机井上部和下部采用不同的口径,即上大下小,中间用变径管连接,这样可以安装深井泵和较大规格的水泵,充分发挥井的作用。

3. types of wells and pipe diameter: according to the main pumping equipment types and specifications. Sometimes the upper and lower parts of the well are equipped with different caliber, that is, the upper and lower part is connected with the variable diameter pipe in the middle, so that the deep well pump and the larger size pump can be installed, so as to give full play to the role of the well.

4.多孔滤水管要有适当的抗压强度和透水性,管口要平、圆,采用胶结性强的沥青砂浆粘管,提高井管强度,防止井管脱节、张嘴、错口和破裂。

4., the porous filter pipe should have proper compressive strength and permeability, and the orifice should be flat and round. The cemented asphalt mortar pipe can be used to improve well pipe strength and prevent well pipe disconnection, opening mouth, wrong mouth and rupture.