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用混凝土或钢筋混凝土作井管打地下井,从1963年起,曾经开始进行试验,但由于采用钢丝绳托底下管施工,故井深大都在数十米左右,而要打更深的井,目前还是使用钻机悬挂下管法施工。悬挂下管法,要求井管是抗拉构件。在特殊情况下,只要满足抗裂性的要求,即可使用。如南京第五建筑工程公司,于1969年进行试验,几年来已用钢筋混凝土作井管,打了200多口井(250米以上深井占25％以上),使用效果一般良好。
With concrete or reinforced concrete for underground pipe wells hit well, since 1963, has begun to test, but because of the use of wire rope under the tube construction, it is mostly in the depth of dozens of meters deep, and to fight deeper wells, is still used Drill hanging under the tube construction. Suspension under the tube method, requires well tubular tensile member. In special cases, as long as the crack resistance requirements can be used. Such as Nanjing No. 5 Construction Engineering Company, in 1969 to conduct tests, several years have been used for reinforced concrete tube, hit more than 200 wells (more than 250 meters deep accounted for more than 25%), the use of generally good results.