| 摘要 |
The impression filter for the interlayer water drainage, the installation procedure, and the use of the impression filter for prolongation are solving the problem of how to control the drainage of overlayer water or gas reservoirs in underground infrastructure construction works. The solution of the problem is in that the drainage impression filter (1) is equipped with a rotary chisel (1.1) and a sealing pipe with a piston (1.3) which is used to bore directly into an aquifer without any danger that an uncontrolled influx of water or gas into the underground construction works might occur. During the period of boring towards the aquifer, the circulation of the spilling medium is established through boring rods of the diameter of 73 mm (2) and through the sealing pipe (1.3) to the chisel (1.1), and then back along the borehole wall and the outer wall of drilling rods of the diameter of 73 mm (2). Any influx of water or gas through the chisel (1.1) and the sealing pipe (1.3) to an irreversible ball valve (1.4) can be detected by the deflection on a manometer of the spilling medium pump. In the case of a higher hydrostatic pressure within the aquifer from the set circulation pressure of the spilling medium, the ball valve (1.4) throttles or stops the circulation of the spilling medium, which results in an instant deflection of the manometer on the spilling pump. Besides in the case of boring towards the aquifer, the uncontrolled influx of water or gas is prevented also in the case of drainage activation. In this application, the piston with the sealing pipe (1.3) is unscrewed from the impression filter casing (1.2) by means of auxiliary rods of the diameter of 50 mm (3). The piston of the sealing pipe (1.3) which is pulled or held in position by means of the auxiliary rods of the diameter of 50 mm (3), is sealing the gap at the interior wall of the drilling rods of the diameter of 73 mm (2) all along its path, and thus sustaining the pressure of water or gas which has built up above it due to the influx through a perforated part of the impression filter casing (1.2), after the sealing pipe has left its seat within the chisel (1.1). |
