CN2876183Y - Open slot inner pipe pressure expanding type pressure reducing well pipe - Google Patents

Abstract

The utility model discloses a pressure-reducing well pipe with a groove on inner tube and pressure increased inside inner tube. The pressure-reducing well pipe consists of an outer tube (1), a filtering layer (2), an inner tube (3) and a hoisting handle (5). A long groove (4) is arranged on inner tube along the axial direction. Ear-like handles (5) are fixed on the top and the bottom of the inner wall of the inner tube. The inner tube (3) and the outer tube (1) are both PVC multi-hole screen pipes. The filtering layer (2) is sleeved onto the inner tube (3) and pushed into the outer tube (1), and then the filtering layer (2) is tightly adhered onto inner wall of the outer tube (1) through elasticity of the inner tube (3). When the well pipe is filled with water and is nearly jammed, the inner tube (3) can be hoisted out through a hoisting tool, and then the filtering layer (2) can be replaced. The well pipe is easily hoisted, the filtering layer (2) is easily replaced, the water seepage pressure reducing effect is good, and the utility model is economical.

Description

Pipe turgor pressure formula pressure reducing well pipe in the fluting

One, technical field

The utility model relates to water conservancy dam construction technology, specifically relates to reduce the interior pipe of the fluting turgor pressure formula pressure reducing well pipe of dykes and dams basis osmotic 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 oozed the control processing method seeking new levee foundation for this reason, wherein cut-off wall is one of major measure of current popular, just not saying but various impervious wall is high with its cost of the practice of river dike seepage interception, 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, the content of utility model

The purpose of this utility model is to provide pipe turgor pressure formula decompression pressure reducing well pipe in a kind of fluting, and pipe can promote taking-up in the fluting of this well casing, changes the filtration beds that stops up then.

Pipe turgor pressure formula pressure reducing well pipe in the fluting, by outer tube, filtration beds, interior pipe, lifting handle are formed, pipe has a long rabbet along axis direction in it is characterized in that, and respectively be installed with the lifting handle in the inwall upper and lower part of interior pipe, in being placed on, filtration beds between pipe and the outer tube, is close to outer tube wall.

Above-mentioned outer tube and interior pipe are the porous floral tube, are made by the PVC material, and the aperture is 20mm on the outer tube, and pitch of holes is 80mm, and the aperture is 15mm on the interior pipe, and pitch of holes is 60mm.

Above-mentioned filtration beds is a nonweaven geotextile, the wide 30mm of the long rabbet on the interior pipe, and promoting handle is wall ear formula, and is fixed on interior pipe from each 300mm place of upper and lower end with bonding or welding manner.

The basic structure of pipe turgor pressure formula pressure reducing well pipe is in the fluting:

This well casing is made up of pipe+lifting handle in outer tube+geotextile filtration beds+fluting.

Can to dismantle in order satisfying, to require well casing to reach the purpose of the native draining of filter again, this structural requirement outer tube is near borehole wall, and interior pipe presses outer tube wall with filtration beds.Inside and outside The selection of pipe PVC plastic pipe satisfies certain elasticity requirement, and the size that interior pipe is selected for use is slightly smaller than size of outer tube, is Φ 100mm as the outer tube interior diameter, and interior external diameter of pipe is Φ 95mm, and inside and outside caliber differs and is 5mm.

Pipe in installing for convenience and removing, can be according to the diameter of inner pipe size, open the notch (about this sample slot opening 30mm) of certain width along its axis direction, and from the bonding lifting handle in each 300mm place of tubing upper and lower side, handle is done wall-forming ear formula, an i.e. bonding stull on inwall earlier, bonding one perpendicular support on the face of vertical stull again, concrete structure is seen Fig. 2.

Well casing of the present utility model is compared with existing and pipe, has easy construction, as long as just can directly pipe in the fluting be elevated by the lifting instrument, then the filtration beds that has stopped up is more changed.Not only prolong the application life of relief well, and significantly reduced the funds spending.

Four, description of drawings

The structure and the generalized section of pipe turgor pressure formula pressure reducing well pipe in Fig. 1 slots;

The schematic diagram that pipe and lifting handle were installed in Fig. 2 slotted;

The lifting instrument schematic diagram of pipe in Fig. 3 slots;

Reference numeral: pipe, 4-notch, 5-lifting handle, 6-lifting arm, 7-directive wheel, 8-promote base in 1-outer tube, 2-filtration beds, the 3-fluting.

Five, the specific embodiment

During concrete operations, the PVC porous outer tube that with interior diameter is 100mm is earlier put into Kong Jingzhong, external diameter is to put filtration beds on the interior pipe of 95mm, tightens up by rope at the fluting place of interior pipe, and diameter of inner pipe is further dwindled, be convenient to insert outer tube (because interior caliber cooperates better, push also and realize easily), behind the insertion outer tube, will haul and unclamp, because pipe recovers original diameter in the elasticity, will compress the filtration beds (see figure 3).Dismounting can realize by promoting facility, at first will shrink soft rope by promoting base, after the pulley changed course, pipe fixedly tightens up soft rope then in radial direction shrinks, and promotes interior pipe together with lifting arm, be pulled out until interior pipe, also sectional promotes (see figure 3).

Detachable Scheme Choice is for receiving earlier the scheme of afterwards putting forward.The enforcement of scheme is mainly finished by the lifting instrument, the lifting instrument of design is for receiving the type of putting forward at present, inside and outside footpath cooperates naturally, compresses filtration beds, receives when carrying, shrink interior pipe with tightening up soft rope by pulley earlier, frictional force in as far as possible reducing between pipe and the outer tube proposes interior pipe by lifting arm and lifting base then, the filtration beds that stops up is taken out change then, again with filtration beds new on the interior pipe box, as stated above interior pipe is inserted in the outer tube.

Claims (4)

1. manage turgor pressure formula pressure reducing well pipe in a fluting, form by outer tube (1), filtration beds (2), interior pipe (3), lifting handle (5), pipe has a long rabbet (4) along axis direction in it is characterized in that, and respectively be installed with in the inwall upper and lower part of interior pipe (3) promote handle (5), filtration beds (2) is placed between interior pipe (3) and the outer tube (1), is close to the inwall of outer tube (1).

2. pipe turgor pressure formula pressure reducing well pipe in the fluting according to claim 1, it is characterized in that described outer tube (1) and interior pipe (3) are PVC porous floral tube, the aperture on the outer tube (1) is 20mm, and pitch of holes is 80mm, aperture on the interior pipe (3) is 15mm, and pitch of holes is 60mm.

3. pipe turgor pressure formula pressure reducing well pipe in the fluting according to claim 1 is characterized in that described filtration beds (2) made by geotextile.

4. pipe turgor pressure formula pressure reducing well pipe is characterized in that described lifting handle (5) is wall ear formula in the fluting according to claim 1, and is fixed on interior pipe from upper and lower end 300mm place with bonding or welding manner.