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目前，我国砂矿钻探方法最普遍的是采用吊锤冲击、抽砂筒取样和双管同步钉进、内管取样的钻探方法，这两种钻探方法由于外管都是钉入地层，终孔拔管都相当困难。除大功率设备靠自身动力起管外，其余大部分设备都要另外附设拔管机构。陆上钻探采用两个20吨以上的千斤顶拔套管。水上钻探在没有好的解决办法时，一般选用大功率动力设备，这样钻探设备的重量，体积就很大，就需要选择大吨位的钻探船。如果水上钻探设施采用钻探平台，那么要求平台也要有很大的承载能力。我队选择的钻探设备功率为6.5hp（1hp=745W），自行设计的钻探平台承载能力较小。在终孔起拔外管时，我们设计了两种结构都比较简单而又有效地起管顶台，具体结构如附图。
At present, the most common method of sand mining in our country is to use the method of pendant impact, sand sampling and double-pipe synchronous nailing and internal tube sampling, both of which are driven into the formation and the final hole Extubation are quite difficult. In addition to high-power devices rely on their own power from the tube, most of the rest of the equipment to be additionally attached extubation. Onshore drilling using two more than 20 tons of jacking casing. Water drilling in the absence of a good solution, the general choice of high-power power equipment, drilling equipment so that the weight, the volume is large, you need to select a large tonnage of drilling vessels. If the water drilling facilities using drilling platform, then require a platform also has a great carrying capacity. The drilling equipment selected by our team has a power of 6.5hp (1hp = 745W), and the self-designed drilling platform has a smaller carrying capacity. In the final hole when pulling the outer tube, we designed two structures are relatively simple and effective from the roof, the specific structure shown in the drawings.