Double-tube extrusion type layered water stop
An extrusion-type, water-stop technology, applied in wellbore/well components, earthwork drilling, sealing/packing, etc., can solve the problem of limited application scope, reduced development cost, and easy gas leakage of inflatable water-stop devices and other problems, to achieve the effect of good sealing effect, low cost and convenient pumping.
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Embodiment 1
[0033] A double-tube extrusion type layered water stop, combined with Figure 1 to Figure 3 As shown, it includes an inner pipe 1 , an outer pipe 2 , an upper water-stopping mechanism 5 , a lower water-stopping mechanism 6 , a water inlet channel and a bottom baffle 8 .
[0034] The top end of the inner tube 1 is connected with a hoist, and the hoist pulls up the inner tube 1 for positioning. The inner diameter of the inner tube 1 is 28 mm, and the inner tube 1 can be formed by connecting a plurality of segmented tubes of a certain length in sequence, and the segmented tubes are connected by screws. During the actual pumping operation, a water pump is connected to the middle of the inner pipe 1, and the water pump is used to pump the water in the test aquifer into the inner pipe.
[0035] The outer tube 2 is sleeved outside the inner tube 1, the distance between the inner wall of the outer tube 2 and the inner tube is 9mm, and the top end is connected with the hydraulic head,...
Embodiment 2
[0049] On the basis of Example 1, this example is different from Example 1 in that the top deformation blocking structure is set as a white gauze bag containing dry clay a, and the bottom deformation blocking structure is set as a white gauze bag containing dry clay b, dry clay in a knotted white gauze bag a and dry clay in a knotted white gauze bag b, specifically, dry clay in an elastic rubber band knotted white gauze bag. The arrangement of the knotted white gauze bag dry clay a and the knotted white gauze bag dry clay b makes the device more suitable for layered water-stopping of loose aquifers such as sand, pebbles and gravel, thereby increasing the application of the device scope.
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