CN100540812C

CN100540812C - Internal support tube sheet type pressure reducing well pipe

Info

Publication number: CN100540812C
Application number: CNB2006100391636A
Authority: CN
Inventors: 赵坚; 赵恒文; 范劲; 速宝玉; 张祝添
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2006-03-29
Filing date: 2006-03-29
Publication date: 2009-09-16
Anticipated expiration: 2026-03-29
Also published as: CN1858365A

Abstract

A kind of internal support tube sheet type pressure reducing well pipe is made up of porous outer tube (1), filtration beds (2), interior pipe (3); Interior pipe (3) is the annular internal brace tubular structure that is made of four sections of jurisdiction (6) of separating, central authorities at interior pipe (3) are provided with support link (4) and force transmission shaft (5), on support link (4) branch, in, following three layers, four every layer, one end of support link is connected on the section of jurisdiction (6), the other end is connected on the force transmission shaft (5), the skeleton of the similar umbrella of its structure, when carrying on the force transmission shaft (5), support link (4) is shunk, when force transmission shaft presses down, connecting rod drives section of jurisdiction (6) and opens, the filtration beds (2) that just will be enclosed within the periphery, section of jurisdiction is close to the inwall of outer tube (1), when filtration beds (2) stops up, drives section of jurisdiction (6) contraction as long as promote force transmission shaft (5) support link (4), just desirablely go out filtration beds (2) and change, this well casing is rational in infrastructure, and effect of easing stress is remarkable, economy and durability.

Description

Internal support tube sheet type pressure reducing well pipe

One, technical field

The present invention relates to the dykes and dams Foundation Design, specifically relate to reduce the internal support tube sheet type pressure reducing well pipe of dykes and dams base low layer seepage water pressure.

Two, background technology

A large amount of dykes and dams destroy to such an extent that the example survey data shows both at home and abroad, because the disaster that seepage flow causes accounts for whole accident and gets about 40%, the piping of the disaster form of expression such as dike (dam) body, dike (dam) base, stream soil, crack, collapse on the bank etc., and wherein piping, stream soil directly are because osmotic pressure, big of osmotic gradient cause.According to estimates, during the great flood of basin, the Changjiang river in 1998, take place in the dangerous situation, the dangerous situation that infiltration directly causes accounts for 70%, failure by piping is the most outstanding again.

People have created the control techniques measure of oozing of a lot of effective antiseepages, drainage and step-down in the long-term practice of hydraulic engineering and in the seepage flow control theory, Study on Technology, the osmotic pressure that reduces dykes and dams basis and downstream is to guarantee the safety of engineering.Wherein when dike (dam) base covering layer top down be aquitard, bottom when being the binary of highly permeable layer or polynary soil structure, adopt the basic osmotic stability of relief well technology control more.What adopt at first that relief well prevents that dykes and dams bases from excessive uplift pressure taking place is CE, US Army, in of the additional measure of nineteen forty-two Montana State Ford Parker dam employing relief well as seepage flow control, effect is fine, make the toe hydrostatic pressure reduce to 5 feet by 45 feet, this technology is promoted gradually later on.Adopt not only economy but also can reduce the uplift pressure in the basic downstream of dike (dam) effectively of relief well technology, therefore along the Yangtze River, many dike sections downstream of rivers Hu Di such as Hubei Jingjiang levees, Jiujiang embankment and Guangdong San Shuibei Jiang Dadi is equipped with relief well.But a large amount of practical situations show, because originally there is defective in traditional relief well in design, structure, materials and management, make the efficient of relief well and application life not satisfactory, wherein because the segregation that relief well gravel filtrate produces when the construction filler.Difficult quality control usually stays hidden danger, the service efficiency and the application life of relief well are had a greatly reduced quality, as some embankment downstream relief wells of Hubei, Jiujiang service lives about about 1-3, many mouthfuls of relief wells have been built in Bei Jiang embankment stem of noble dendrobium dangerous section, Guangdong, fail to bring into play the effect that its row is oozed decompression with regard to some well more than a year; The efficient of U.S.'s Mississippi embankment relief well in the reduction of 15 years three/the last one, check result thinks it mainly is due to fouling is stopped up in the gravel loaded filter.

One of modal failure cause of relief well is the filter material generation silting of filling in the well, and whether this silting takes place mainly to see whether filter material grating and levee foundation soil particle mate, if filtrate and protected native matching relationship are bad, silting just takes place easily how much.Also the mineralogical composition in some ground stratum is dissolved in the water, and produces new compound between soluble salt that contains in the underground water that flows and the various chemical substance under the certain environment temperature, is deposited in the filtering layer, just may produce chemical silting.At some low flow velocity, under the water environment of oxygen rareness, also can produce new biological microorganism, its metabolin can be with the seepage channel silting, as the metabolin of eating the anaerobic bacteria of iron, food sulphur just found once in the water-supply-pipe of Lion Rock tailing dam that this sometimes biology also can quicken chemical silting.See at most in the dam construction at present, the most incident still how much siltings, it reduces the relief well effect even lost efficacy, the use that has in the practical application 1 year was perhaps also just lost efficacy (relief well has moved for many years also to have minority to build preferably) in two to three years.Because relief well is darker, by silting filter material be difficult to even can't take out, also once attempted the water under high pressure backwash, but effect is unsatisfactory, usually can only let alone to lose efficacy.For engineering safety, to have to reconstruct, a bite well cost often needs 2-3 about ten thousand, so not only cause dam construction spacecraft long-term operation management expense to improve greatly, and (dam) engineering is very dangerous to make dike again.People are seeking new levee foundation seepage flow control processing method for this reason, wherein cut-off wall is one of major measure of current popular, just not saying but various impervious wall oozes Jiang Di its cost height of the practice that blocks, a large amount of employings back is opened with regard to its long-term consequence and is seen, may cause ecological environment to change and deterioration, this is very noticeable.

Three, summary of the invention

The object of the present invention is to provide a kind of internal support tube sheet type pressure reducing well pipe, this well casing have promote in tube side just, change advantages such as to stop up filtration beds easy, and infiltration is fast, and effect of easing stress is obvious.

Internal support tube sheet type pressure reducing well pipe, by outer tube, interior pipe, filtration beds is formed, the annular internal brace tubular structure that pipe is made up of four identical sections of jurisdiction of separating in it is characterized in that, the interior central authorities of managing are provided with support link and force transmission shaft, support link is divided upper, middle and lower-ranking, every layer of four connecting rod, hinge is equipped with at two ends four support link, and an end hinge is separately fixed on four sections of jurisdiction, and other end hinge is separately fixed on the force transmission shaft, in being placed on, filtration beds between pipe and the outer tube, is close on the outer tube wall.

The basic structure of internal support tube sheet type pressure reducing well pipe:

This well casing is formed by managing in outer tube+geotextile filtration beds+inner support pipe type.

Because there is the shortcoming of underaction in pipe turgor pressure formula pressure reducing well pipe structure in the fluting in operation, on the basis that keeps the well casing three layer construction, four identical sections of jurisdiction interior pipe being changed into separation assemble the ring-like inner bearing type separator tube chip architecture of formation, be drilled with aperture on the section of jurisdiction, the aperture is 20mm, pitch of holes 80mm, interior pipe central authorities are provided with support link and force transmission shaft.Carry on the force transmission shaft and can draw support link in, four sections of jurisdiction constitute the interior pipe that diameter is less, can be enclosed within the geotextile filtration beds periphery of section of jurisdiction this moment, together insert in the outer tube, after interior pipe puts in place, to pressing down (similar rim structure of umbrella), the section of jurisdiction turgor pressure is strutted by force transmission shaft, support link props up the section of jurisdiction, and outer tube wall is pressed to the geotextile filtration beds in the section of jurisdiction.If filtration beds stops up, during the infiltration weak effect, as long as promote force transmission shaft, draw support link and section of jurisdiction in, just can put forward interior pipe, new filtration beds is enclosed within the periphery of section of jurisdiction, insert outer tube again, press down force transmission shaft, can press to outer tube wall to filtration beds by the section of jurisdiction.

Internal support tube sheet type pressure reducing well pipe of the present invention, through evidence, this well casing have promote in tube side just, it is easy to change filtration beds, infiltration is fast, effect of easing stress is good, and parts can suitability for industrialized production, has saved spending greatly.

Four, description of drawings

Fig. 1 separates the schematic diagram of pipe in the ring-like inner support pipe sheet type structure of forming the section of jurisdiction;

The sectional drawing of Fig. 2 internal support tube sheet type pressure reducing well pipe;

The schematic diagram of Fig. 3 internal support tube sheet type pressure reducing well pipe;

Reference numeral: pipe, 4-support link, 5-force transmission shaft, 6-section of jurisdiction in 1-outer tube, 2-filtration beds, the 3-.

Five, the specific embodiment

Outer tube is a PVC porous floral tube, internal diameter is 100mm, the aperture of aperture is 20mm on the outer tube, pitch of holes 80mm, the long 4m of outer tube single-unit, outer tube is inserted in the native hole of having accomplished fluently, interior external diameter of pipe is 95mm, and long 4m cuts open into the quartering with pipe in the PVC and gets four sections of jurisdiction, be drilled with aperture on the section of jurisdiction, the aperture is 20mm, pitch of holes 80mm, and interior pipe central authorities are provided with support link and the force transmission shaft that the PVC material is made, on support link is divided, in, lower floor, 4 every layer, with the hinge at support link two ends, an end is welded on the section of jurisdiction respectively, the other end is welded on the force transmission shaft, the geotextile filtration beds of making is enclosed within the periphery of section of jurisdiction, pushes in the outer tube with force transmission shaft, when force transmission shaft presses down, by support link the section of jurisdiction is opened, filtration beds is pressed on the outer tube wall.When needs are changed filtration beds, as long as force transmission shaft is upwards put forward receipts, just can take out the ring-like interior pipe that the separator tube sheet is formed, new filtration beds is enclosed within the section of jurisdiction periphery inserts in the outer tube, press down force transmission shaft, just open the section of jurisdiction, and filtration beds is pressed on outer tube wall.

Claims

1. internal support tube sheet type pressure reducing well pipe, comprise outer tube (1), filtration beds (2), interior pipe (3), pipe (3) is the annular internal brace tubular structure that is made of four identical sections of jurisdiction (6) of separating among its spy, it is characterized in that described outer tube (1) is the porous floral tube, the aperture of its aperture is 20mm, and pitch of holes is 80mm.

2. according to the described internal support tube sheet type pressure reducing well pipe that gets of claim 1, it is characterized in that all being drilled with aperture on described four sections of jurisdiction (6), its aperture is 20mm, pitch of holes 80mm.