Internal support net sheet type pressure reducing well pipe

Abstract

The internally supported net sheet type pressure reducing well pipe consists of porous outer pipe, filtering layer and inside pipe. The inside pipe is one ring internally supported net structure comprising four net sheets and has in the center support link rods and driving shaft. There are three layers of support link rods and four link rods each layer, and each of the support link rods has one end connected to the net sheets and the one end connect to the driving shaft to form umbrella rib like structure. When the driving shaft is upward lifted, the support link rods are contracted; and when the driving shaft is downward pressed, the link rods drive the net sheets to open and the filter layer on the net sheets contacts closely to the inner wall of the outer pipe. In case of the filter layer is blocked, the driving shaft is lifted to contract the net sheets and the filter layer may be replaced. The well pipe structure has reasonable structure and obvious pressure reducing effect.

Description

1. Technical field [0001] The invention relates to dam foundation engineering, in particular to an inner-supported mesh-type decompression well pipe for reducing the seepage water pressure in the lower layer of the dam foundation. 2. Background technology [0002] A large number of dam damage cases at home and abroad show that the disasters caused by seepage account for about 40% of the total accidents, and the disasters are manifested in the form of embankment (dam) body, embankment (dam) foundation piping, flow soil, cracks, bank collapse, etc. , and the piping and flowing soil are directly caused by the large osmotic pressure and osmotic gradient. It is estimated that among the dangerous situations that occurred during the great flood in the Yangtze River Basin in 1998, the dangerous situations directly caused by infiltration accounted for 70%, and the piping damage was the most prominent. [0003] In the long-term practice of water conservancy projects and the research ...

AI Technical Summary

Problems solved by technology

At present, the most common and most prone to occur in dyke projects is geometric silting, which reduces the efficacy of relief wells or even fails them. Relief wells have been in operation for many years)

Due to the depth of the decompression well, it is difficult or even impossible to remove the silted reverse filter material. I have also tried to backwash it with high-pressure water, but the effect is not ideal, and I often have to let it fail.

For the safety of the project, it has to be rebuilt, and the cost of a well often needs about 20,000 to 30,000. This not only causes the long-term operation and management costs of the embankment project to be greatly increased, but also makes the embankment (dam) project very unsafe.

For this reason, people are looking for new treatment methods for embankment seepage and flow control, among which seepage cut-off walls are one of the main measures currently popular, but the cost of various cut-off walls to intercept river embankment seepage is not to mention high, and after a large number of uses In terms of its long-term consequences, it may lead to changes and deterioration of the ecological environment, which is very noteworthy

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