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水泥井管便宜,农用机井中采用较多。为了制作方便,减少运输损伤,一般管头多制成平口,下管时用粘结剂联接。由于沥青具有较好粘结性、防火性和塑性,加热能流动、冷却立即硬化,料源广、成本低,操作简单方便,因此中、浅水井的水泥井管接头多采用沥青联接。 1.沥青标号的选择根据试验结果:兰州炼油厂生产的30甲最好(抗拉强度高),该厂生产的10号和30乙次之。 2.填充料的选择常见填充料有粉末状的滑石粉、水泥等,有纤维
Cement well tube cheaper, more widely used in agricultural wells. In order to facilitate the production, reduce transport damage, the general multi-head made flat mouth, under the tube with a binder connection. As the asphalt has good adhesion, fire resistance and plasticity, heating can flow, cooling immediately hardened, wide source of material, low cost, easy operation, so the cementing of shallow wells and cementing pipe joints to use more asphalt. 1. Asphalt label selection According to the test results: Lanzhou refinery production of 30 A best (high tensile strength), the plant produced 10 and 30 second. 2. The choice of filler Common filler with powdered talc, cement, etc., there are fibers