CN105862716B - Integral type well point plastic strip pipe - Google Patents

Integral type well point plastic strip pipe Download PDF

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Publication number
CN105862716B
CN105862716B CN201610379658.7A CN201610379658A CN105862716B CN 105862716 B CN105862716 B CN 105862716B CN 201610379658 A CN201610379658 A CN 201610379658A CN 105862716 B CN105862716 B CN 105862716B
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pipe
point
integral type
plastic strip
type well
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CN105862716A (en
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张禹
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Cabr Foundation Engineering Co Ltd
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Cabr Foundation Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • E02D3/103Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by installing wick drains or sand bags

Abstract

A kind of integral type well point plastic strip pipe of the present invention, it is characterised in that it includes drain bar, connection box, well-point pipe and connecting tube, and the upper end of drain bar is connected by connecting the lower end of box and well-point pipe, and the upper end of well-point pipe and one end of connecting tube connect.The present invention has the advantages that easy to operate, of low cost, construction effect is good.

Description

Integral type well point plastic strip pipe
Technical field
The present invention relates to a kind of Treatment Methods of Soft Ground more particularly to a kind of integral type well point plastic strip pipes.
Background technology
According to《Code for design of building》(GB5007-2011)7.1.1 it provides, soft foundation is meant mainly by becoming silted up The ground that mud, muck soil, rinse fill, miscellaneous fill or other high-compressibility soil layers are constituted.Building is carried out on soft foundation to apply Work needs first to carry out consolidation process to soft foundation, and consolidation process often uses Application of light well point precipitation, pipe well points precipitation, depth Well well-points dewatering, above-mentioned various dewatering modes all refer to mating well-point pipe:
1, well-point pipe used by conventional light well point is 6 meters of pvc pipes or the permeable chimney filter of 1 meter or so of galvanized pipe+bottom, Hydraulic flushing in hole pore-forming is embedded, punching hole diameter 300mm or so, well point 32 ~ 55mm of pipe diameter, vacuum pump precipitation;
Foundation stabilization light well point spacing is generally 4 × 4m, using vacuum-dewatering, only precipitation function, due to depth as shallow The spacing big time is short cannot to have both vacuum preloading negative pressure consolidation simultaneously;Depth as shallow is handled, is generally individually smaller than 6 meters
2, depth within conventional 15 meters of pipe well points, 200mm diameter above bellowss, drilling diameter is bigger 200mm than well point, 2 ~ 3 meters or so of the permeable chimney filter in bottom, machine drilling pore-forming, pipe well bottom immersible pump gravity precipitation;
3, conventional deep well points well depth is more than 15 meters, 600mm or so diameter steel pipes, 3 ~ 9 meters or so of the permeable chimney filter in bottom, machine Tool Completion of Drilling Hole, deep-well bottom immersible pump gravity precipitation+steel pipe top shut matched with vacuum pipe in steel pipe and vacuumize precipitation, gravity Precipitation+vacuum-dewatering.
4, pipe well uses immersible pump gravity precipitation, the side that deep-well precipitation is combined using immersible pump gravity precipitation and vacuum-dewatering Formula, well-point arrangement spacing is big, general 15m ~ 30m, and thick and thin processing mode lays particular emphasis on precipitation, since the spacing excessive time is short Vacuum preloading negative pressure consolidation cannot be had both simultaneously;Pipe well points and deep well points require soil body osmotic coefficient larger simultaneously (20~200m/d), light well point require soil body osmotic coefficient 0.1-5.0m/d, and the infiltration coefficient of weak soil be typically about i × 10-5~i×10-7Mm/s (0.864mm/d ~ 0.00864mm/d), therefore reinforced soft soil ground is ineffective, is typically only used for reducing Level of ground water, is required to pipe well and deep well points drainage end is set in pervious bed, therefore its precipitation range causes periphery compared with conference Environment differential settlement, is affected, and is generally required to mating setting water-stop curtain to prevent from, to surrounding environment influence, improving drop Water efficiency, cost are higher.
5, any of the above well point pore-forming bury be both needed to insert around well-point pipe behind well point the yellow ground of a large amount of good water permeabilities or Gravel filtrate remains drainage channel after easily forming work, consolidation settlement is drained after generating unfavorable work
6, precipitation+heavy tamping treatment mode reinforcing soft ground, principle, effect are combined using discharging consolidation+dynamic consolidation Preferably, but processing depth is shallower, no matter using Application of light well point precipitation+strong rammer, pipe well points+strong rammer etc. handles depth generally Within 6 meters, individual documents, which have, sees tube well dewatering+heavy tamping treatment depth up to 10 meters, but needs pipe well points arrangement spacing encryption, Surrounding must be provided with reliable water-stop curtain, rather than easy mud barricade, cost are high.Dewatering dynamic compaction Ground Treatment is thick because of precipitation And that dredges layouts and in short term(30 days or so)Processing mode is suitable only for shallow-layer processing;
7, weak soil natural moisture content is high, void ratio is big, compressibility is high, shearing strength is low, the coefficient of consolidation is small, consolidation time Physico-mechanical properties differ larger etc. greatly, between bad hydraulic permeability, soil layer layered distribution complexity, each layer for length, high sensitivity, perturbation Feature, for weak soil feature, foundation stabilization needs preferentially to be perturbed in reduction and do not broken as possible using the thin and close reinforcing principle of full hall Slowly apply various load on the basis of its bad Natural gas composition, gradually discharging consolidation completes reinforcing task.Obviously, above all methods fail Well adapt to reinforced soft soil ground feature and requirement
8, integrated light well plastic strip precipitation well point pipe, it includes light well point pipe and plastic draining board, and light well point pipe is inserted Enter plastic draining board side, and light well point pipe side is closed with the close note of plastic draining board, forms integrated light well plastic strip dewatering well Point pipe, this method is the combination of light well point pipe and plastic draining board, belongs to light well " side suction " plastic strip mode, and vacuum pump negative pressure is first Light well point is first acted on, negative pressure acts on draw ambient underground water, part effect by a well point pipe end chimney filter part The underground water in plastic draining board is inhaled in side, major function is by the low underground water of well-point pipe negative pressure drop, and miscellaneous function is side The underground water in plastic draining board is inhaled, construction method is first to carry out plastic draining board mechanical execution, and plastic draining wrench exposes Ground utilizes thereafter plastic strip construction hole, well-point pipe and the plastic draining board appeared manually is inserted into soil about underground 2 ~ 3 together At rice, hole is backfilled.
The presence of above all methods can improve and optimize place.
Invention content
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of easy to operate, of low cost, construction effect it is good one Body formula well point plastic strip pipe.
The object of the present invention is achieved like this:
A kind of integral type well point plastic strip pipe, it is characterised in that it includes drain bar, connects box, well-point pipe and connecting tube, One end of drain bar is connected by connecting one end of box and well-point pipe, and the other end of well-point pipe and one end of connecting tube connect.
Drain bar includes the filter membrane of internal core plate and core plate periphery, and it is logical that draining is formed between the core plate and filter membrane Road, the core plate are made of non-degradable material or material difficult to degrade, and the filter membrane is made of degradation material.
Core plate includes the main gusset and the more longitudinally spaced secondary gussets being arranged in before and after main gusset of a lateral arrangement, The gap formed between main ribs plate, secondary gusset and filter membrane is drainage channel.
The connecting tube is wired hose, and connecting tube includes hose and the spiral wire of Lining Hose.
Compared with prior art, the beneficial effects of the invention are as follows:
1, integral type well point plastic strip pipe is to the completely new improvement of one kind of conventional well-point pipe in reinforced soft soil ground mode, one Formula well point plastic strip pipe can substitute above-mentioned all kinds of well-point pipes, a kind of multiple precipitation task of form completion
2, plastic strip pipe in integral type well point replaces conventional well-point pipe filter, the infiltration of plastic draining board filter membrane using plastic draining board Coefficient is generally higher than 5 × 10-3mm/s(0.432m/d), longitudinal flowing water measuring is generally higher than 40cm3/ s substantially increases soft stickiness The drainage condition of soil, the infiltration coefficient of conventional weak soil are typically about i × 10-5~i×10-7Mm/s, and the permeability of Soft Soil Layer has Apparent anisotropy, because the presence of Extra-fine sand interlayer and lenticular body and clay particle align soil in deposition process Deng often making the infiltration coefficient of horizontal direction be far longer than the infiltration coefficient of vertical direction, particularly with the soft of horizontal burning into sand layer Soil layer is more notable, therefore soft clay vertical direction is impermeable stratum, and horizontal direction is weak to middle pervious bed, this is to improve weak soil One favorable factor of layer engineering characteristic, the presence of plastic draining board increase the horizontal direction of the soil body and vertically to infiltration coefficients, Therefore hypotonicity reinforcement of soft soil characteristic is more suitable for as filter using plastic draining board, the longer the better for the length of chimney filter section, more preferably Weak soil horizontal osmotic coefficient is played to be much larger than vertically to the objective fact of infiltration coefficient.
3, plastic strip pipe in integral type well point replaces conventional well-point pipe filter using plastic draining board, has further the advantage that:
A, drainability is good, and draining is unimpeded, and drainage effect is guaranteed.
B, material has good intensity and ductility, and ground deformability can be suitble to without influencing drainage performance.
C, drain bar cross dimensions is small, is disturbed to ground during injection drain bar small.
D, construction is fast, short time limit
E, cheap, it is suitble to large area to lay
When being reinforced using draining concretion method for deep soft soil foundation, technically and economically consider, uses Almost unique economic, effective, the feasible method of plastic draining board.
3, plastic strip pipe in integral type well point preferably uses filter membrane Degradable plastic water drainage plate, and drain bar filter membrane is using degradable Biomaterial, does not stay drainage channel to reduce settlement after construction after environmental protection and work, core plate reduces cost core plate conduct simultaneously without degradation Reinforcement material reinforcing soft soil;
4, it is both needed to insert a large amount of yellow ground or the permeable filtrate of gravel in conventional well-points dewatering hole, the presence of permeable filtrate forms work After remain drainage channel, often cause certain residual settlement after work, especially construction period with failing the weak soil fully consolidated Base, the slow consolidation settlement under load long term after work form disease, and after improvement, the top of integral type well point plastic strip pipe is tied Structure(Connect box, well-point pipe and connecting tube)It can pull out, after the completion of vacuum preloading, precipitation gently ram, be pulled out using pipe extractor The superstructure of the superstructure of integral type well point plastic strip pipe, integral type well point plastic strip pipe can reuse, while under earth's surface Drain bar filter membrane degradation in shallow soil body under noresidue drainage channel, the shallow-layer soil body does not stay draining logical after realizing whole work Road reduces residual settlement after work;
5, integral type well point plastic strip is convenient for mechanized construction, and Quick mechanicalization construction is realized using board-plugging device
6, integral type well point plastic strip pipe is cheap, and the laying mode for being suitble to large area thin and close, its spacing can be according to need It is set as 1m × 1m ~ 4m × 4m, depth can be set as 10 ~ 25 meters according to soil layer feature
7, integral type well point plastic strip pipe can be used for the reinforcement of soft soil for precipitation+gently ram, and the weak soil for being more suitable for vacuum preloading adds Gu a kind of material multiple use
8, conventional precipitation gently rams well point mechanical hole building and does not often take out water formation dried-up well, general to recommend to rush using artificial water Method pore-forming, the general 200 ~ 300mm in aperture, general 1 meter or so of filter, pore-forming is bad can not to be often discharged, and spacing of layouting is due to shining It cares for and rams walking and be also impossible to too close, the limited water lift of light well point vacuum-dewatering principle is height-limited, seen in document most at present Deep light well point considers precipitation funnel also just at 7 meters or so, therefore level of ground water reduces only 4 ~ 5 meters or so of limit depth, Being required to backfill medium coarse sand ensures water recharging, and water yield is smaller, causes vacuum jet pump negative pressure to reduce the very fast vacuum that influences and drops Water effect, while there are sand drains to continue the unfavorable factors such as drainage subsidence after causing gas leakage negative pressure in well point not high and work, therefore change now Dewatering dynamic compaction prevalence into type uses deep-well precipitation or tube well dewatering, but layouting in view of two kinds of dewatering modes can not possibly be too close, only It can play the role of precipitation, it is difficult to play vacuum preloading, integral type well point plastic strip vacuum system, filter depth can compare vacuum Precipitation well point is deep, takes into account gravity precipitation and vacuum-dewatering, and cheap suitable large area is laid, and not only improves precipitation, and advantageous In vacuum preloading, realize that mechanized construction pore-forming efficiency is high, since filter uses the higher overlength plastic draining board of water-flowing amount, extremely Well rate is almost nil, either precipitation depth also or precipitation efficiency perfect can to substitute above-mentioned various well-points dewatering completely light Rammer mode;
9, lakes and marhshes domain underwater vacuum precompression in river sea is improved to no film and is moulded without sand only integrated construction formula well point by above-mentioned analysis Heat-extraction system, it is underwater to connect manifold, underground water reciprocation cycle seepage field is formed by the seepage flow flow of water pressure difference that jet pump is formed, Realize vacuum preloading seepage consolidation;To prevent seepage field, Free water body forms invalid seepage flow on the ground, can suitably increase one The well point length of tube of formula well point plastic strip system at least should be greater than 6 meters of depth of land setting, according to soil properties and reinforcement criteria It adjusts accordingly.
10, integral type well point plastic strip pipe is more suitable for ultra-soft foundation reinforcing of reclaiming fields from the sea, and realization method is, by simple Artificial insertion integral type well point plastic strip pipe realize shallow-layer vacuum preloading seepage consolidation and precipitation under the premise of preferable fast sealing Precompressed multiple effect.
11, integral type well point plastic strip pipe can be embedded with horizontal direction, and horizontal direction draining is achieved in that excavation 3 The groove of ~ 5m depth, bottom be laid with 5 ~ 10cm yellow ground or gravel filtering material, upper edge trench length direction be laid with one or The plastic draining board of a plurality of integral type well point plastic strip, connects box and 3 ~ 5 meters of well-point pipe embedded depth vertically goes out ground, well along cell wall Point pipe and plastic strip are L-shaped, after the completion of laying, re-lay the yellow ground or gravel filtering material of 5 ~ 10cm thickness thereon, then return again Clay sealing is filled out, one of horizontal drainage is formed, above step is repeated several times, and can form multiple tracks horizontal drainage, by horizontally disposed Multiple tracks integral type well point plastic strip pipe realizes horizontal drainage, and the fast rainfall of the shallow-layer soil body may be implemented.Integral type well point plastic strip pipe Can also be during backfill or dredge fill, the layering of coordinative construction progress is laid with, and Dewatering task is rapidly completed.
Therefore the present invention has the advantages that easy to operate, of low cost, construction effect is good.
Description of the drawings
Fig. 1 is the elevational schematic view of the integral type well point plastic strip vacuum system of the present invention.
Fig. 2 is the schematic top plan view of the integral type well point plastic strip vacuum system of the present invention.
Fig. 3 is the structural schematic diagram of the integral type well point plastic strip pipe of the present invention.
Fig. 4 is the sectional view of the drain bar of the present invention.
Fig. 5 is the structural schematic diagram of the connection box of the present invention.
Fig. 6 is enlarged drawing at the A in Fig. 2.
Fig. 7 is the schematic diagram of the transverse tube in Fig. 6.
Fig. 8 is enlarged drawing at the B in Fig. 2.
Fig. 9 is the construction method schematic diagram of the embodiment of the present invention one.
Wherein:
Drain bar 1, core plate 1.1, main gusset 1.11, secondary gusset 1.12, filter membrane 1.2, drainage channel 1.3
Connect box 2, shell 2.1, lower interface 2.2, upper interface 2.3, screw hole 2.4
Well-point pipe 3
Connecting tube 4
Transverse tube 5, transverse tube segmentation 5.1, straight pipe 5.11, the first Taper Pipe section 5.12, the second Taper Pipe section 5.13, mostly logical linkage section 5.2, linkage section main body 5.21, transverse tube segmentation interface 5.22, connection interface tube 5.23
Longitudinal tubule (L tubule) 6, longitudinal tubule (L tubule) segmentation 6.1, three-way connection 6.2, check valve 6.3
Vacuum pump 7
Water-stop curtain 8
Deep soil 100
The shallow-layer soil body 200.
Specific implementation mode
Referring to Fig. 1 ~ Fig. 9, a kind of well point plastic strip overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation of the present invention Method, it includes the following steps:
Step 1: levelling of the land, waits for that reinforcing area surrounding excavates draining ditch water discharge;
Step 2: the pre- rammer before precipitation is selected without or carried out according to soil condition, energy level tentative 600 ~ 1000kN.m, 4 × 4 ~ 7 × 7m of square tamping point spacing are adjustable, are bulldozed after rammer, and construction water-stop curtain 8, sealing are selected by operating mode Curtain 8 is cement mixing pile lateral seal barricade or mud lateral seal barricade;
Step 3: integral type well point plastic strip vacuum system is arranged
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice;
1 ~ 4m of grid spacing of integral type well point plastic strip pipe network lattice is adjustable;
Integral type well point plastic strip pipe(Namely improved branch pipe)Including drain bar 1, connection box 2, well-point pipe 3 and connect Take over 4, the drain bar 1 are vertically arranged in deep soil 100, and the length of drain bar 1 is 20m or so, and the well-point pipe 3 is perpendicular To being arranged in the shallow-layer soil body 200, the length of well-point pipe 3 is 6 ~ 9m, and the upper end of drain bar 1 is by connecting box 2 and well-point pipe 3 Lower end connects, and the upper end of well-point pipe 3 is exposed outside the shallow-layer soil body 200, and the upper end of well-point pipe 3 is connect with one end of connecting tube 4, connection The length of pipe 4 is 1 ~ 2m.A diameter of 10 ~ 20mm of well-point pipe 3 and connecting tube 4.
Drain bar 1 includes the filter membrane 1.2 of internal 1.1 periphery of core plate 1.1 and core plate, the core plate 1.1 and filter membrane 1.2 Between form drainage channel 1.3, the core plate 1.1 is made of non-degradable material or material difficult to degrade, and the filter membrane 1.2 is Degradation material is made.
As a preferred embodiment, core plate 1.1 is made of plastic material, filter membrane 1.2 is made of flax material.
As a preferred embodiment, core plate 1.1 includes the main gusset 1.11 and more longitudinally spaced arrangements of a lateral arrangement Secondary gusset 1.12 before and after main gusset 1.11, the sky formed between main ribs plate 1.11, secondary gusset 1.12 and filter membrane 1.2 Gap is drainage channel 1.3.
After drain bar 1 is inserted into ground, as time goes by, since filter membrane 1.2 is made of degradation material, filter membrane 1.2 realize after fast degradations, filter membrane 1.2 are degraded that the only remaining core plate 1.1 in ground, the soil in ground can fill former filter membrane 1.2 and former drainage channel 1.3 space so that soil is fitted closely with core plate 1.1, thus core plate 1.1 in ground not only There is no gap so that ground continues to settle, and the effect of reinforcement is also acted, improves difference floor heights above and below in ground Integraty.
The lower end of the drain bar 1 is provided with bottom discharge plate end socket, and bottom discharge plate end socket uses plastic adhesive tape paper bag It wraps up in be formed.
The connection box 2 includes shell 2.1, and there are one kissed with 1 upper end shape of drain bar for the lower end setting of the shell 2.1 The lower interface 2.2 of conjunction, there are one the upper interface 2.3 coincideing with 3 lower end shape of well-point pipe, institutes for the upper end setting of the connection box 2 Setting is stated on shell 2.1 there are three screw hole 2.4, the rectangular in cross-section structure of the lower interface 2.2, drain bar 1 when installation Upper end is inserted at lower interface 2.2, and then drain bar 1 and connection box 2 are connected in one by drivescrew in screw hole 2.4, so Afterwards plastic adhesive tape is dressed outside in lower interface 2.2.The upper interface 2.3 is circular tube structure, and the lower end of well-point pipe 3 is sheathed on when installation Outside upper interface 2.3, the lower end of upper interface 2.3 and well-point pipe 3 is then dressed outside into plastic adhesive tape.
The connecting tube 4 is wired hose, and connecting tube 4 includes hose and the spiral wire of Lining Hose.
The well-point pipe 3 is the plastic tubes such as PPR, and well-point pipe 3 is wrapped up by diaphragm seal with 4 junction of connecting tube or steel wire Winding is generated negative-pressure dense sealer after being wrapped up using diaphragm seal, when plastic strip pipe vacuumizes in integral type well point and the more is inhaled the more tight.Well point Pipe 3 can also use same wired hose with connecting tube 4 so that well-point pipe 3 forms integral structure with connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system.
The manifold includes longitudinal tubule (L tubule) 6 and more transverse tubes 5 being connected on longitudinal tubule (L tubule) 6.
By multiple transverse tubes segmentation 5.1 and mostly, logical linkage section 5.2 is formed by connecting the transverse tube 5, two neighboring transverse tube segmentation It is attached between 5.1 by leading to linkage section 5.2, mostly logical linkage sections 5.2 are preferably logical using eight logical linkage sections, eight as one kind more Linkage section includes linkage section main body 5.21, and the left and right ends of linkage section main body are respectively arranged with transverse tube segmentation interface 5.22, even It connects and is forwardly and rearwardly respectively set in section main body 5.21 there are three interface tube 5.23 is connected, connection interface tube 5.23 is adjacent Connecting tube 4 is attached, and transverse tube is segmented adjacent 5.1 connection of transverse tube segmentation of interface 5.22, and the transverse tube segmentation 5.1 includes One necking section, necking section are arranged close to mostly logical linkage section 5.2, and the transverse tube segmentation 5.1 further includes straight pipe 5.11, the neck Contracting section includes the first Taper Pipe section 5.12 and the second Taper Pipe section 5.13, the small head end of the first Taper Pipe section 5.12 and the second Taper Pipe section The transverse tube of 5.13 small head end docking, stub end more logical linkage sections 5.2 adjacent thereto of the first Taper Pipe section 5.12 is segmented interface 5.22 docking, the stub end of the second Taper Pipe section 5.13 docks with one end of straight pipe 5.11, the other end of straight pipe 5.11 and its The transverse tube segmentation interface 5.22 of adjacent how logical linkage section 5.2 docks.The taper of first Taper Pipe section 5.12 is more than the second Taper Pipe section 5.13 taper, necking section form venturi jet stream effect.
The longitudinal tubule (L tubule) 6 is vertically connected at one end of all transverse tubes 5, and the one end of transverse tube 5 far from longitudinal tubule (L tubule) 6 is provided with transverse tube envelope Head, far from longitudinal tubule (L tubule) 6, the straight pipe 5.11 of the transverse tube segmentation 5.1 on transverse tube 5 is close for the necking section of the transverse tube segmentation 5.1 on transverse tube 5 Longitudinal tubule (L tubule) 6.A piece longitudinal tubule (L tubule) 6 connects more transverse tubes 5, the longitudinal tubule (L tubule) 6 by multiple longitudinal tubule (L tubule)s segmentation 6.1 and the connection of three-way connection 6.2 and At two neighboring longitudinal tubule (L tubule) segmentation 6.1 is connected by three-way connection 6.2, and the third interface of three-way connection 6.2 connects the cross closed on Pipe 5, longitudinal tubule (L tubule) are segmented on 6.1 and are additionally provided with check valve 6.3, and the end set of longitudinal tubule (L tubule) 6 has longitudinal tubule (L tubule) end socket.
3.3, one layer of geotextiles, two layers of diaphragm seal is covered in total pipe surface of integral type well point plastic strip vacuum system.
Step 4: vacuum preloading
Wait for that reinforcing area outside is taken out in the cofferdam fill of reinforcing area surrounding, cofferdam fill height 0.6 ~ 1.5m height in advance Source water is to waiting in reinforcing area cofferdam so that the high 0.2 ~ 0.6m of water, and then integral type well point plastic strip vacuum system starts vacuum Precompressed, to region surface to be reinforced, region surface to be reinforced all is annihilated by water for suction underground water whole recharge when vacuum preloading To certain altitude, realizes water covering prepressing, covers water-stop;
Its intermediate pump 7 is preferably sealed vacuum jet pump, and vacuum pump is vacuumized to be vacuumized using hierarchical loading:Vacuum The pump hierarchical loading first order takes every 1800 ~ 2000 squares of vacuum pump processing area adjustable, and manifold first section negative pressure is full table 100kPa, total pipe end are not less than 90kPa, wait for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters, vacuum pump hierarchical loading the Two level takes every 1300 ~ 1500 squares of vacuum pump processing area adjustable, waits for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters, very The sky pump hierarchical loading third level takes every 800 ~ 1000 squares or less adjustable of vacuum pump processing area, and so on, it waits settling Meet sedimentation in continuous 5 days and be not more than 2 millimeters, reaches vacuum preloading processing requirement;
Step 5: being carried out in the fill of cofferdam in the water to gutter stored in opening aerial drainage cofferdam fill, geotextiles are removed Diaphragm seal starts first pass vacuum dewatering preloading, and 5 ~ 10 days adjustable, for the purpose of lowering of watertable, waits for that level of ground water reaches It is required that(Level of ground water reaches 4 ~ 6m of below ground), gradually remove manifold preparations first pass at tamping point and gently ram;
Step 6: first pass gently rams, energy level fixes tentatively 1500 ~ 2000kN.m, and 4 × 4 ~ 7 × 7m of square tamping point spacing is adjustable Whole, side is removed total tube edge and is gently rammed, gradually forward impelling, and light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and rams After be bulldozed;
Step 7: integral type well point plastic strip pipe Mesh connection residue manifold and vacuum pump, it is pre- to start second time vacuum-dewatering Pressure, 5 ~ 10 days adjustable, is gradually retained after the completion of second time vacuum dewatering preloading precipitation and removes manifold preparations in part at tamping point It is second time light to ram;
Step 8: second time light ram, tentative 2000 ~ 2800 kN.m of energy level or more, square tamping point spacing 4 × 4 ~ 7 × 7m is adjustable;Side is removed total tube edge and is gently rammed, gradually forward impelling, and light rammer front region, which need to continue precipitation, ensures that level of ground water is not returned It rises, is bulldozed after rammer;
Step 9: integral type well point plastic strip pipe Mesh connection residue manifold and vacuum pump, it is pre- all over vacuum-dewatering to start third Pressure, 5 ~ 10 days adjustable, and third, which is gradually retained after the completion of vacuum dewatering preloading precipitation and removes part manifold at tamping point, to be prepared It is full to ram;
Step 10: remaining manifold is pulled out, when the well-point pipe 3 and connecting tube 4 used is split structure, by well-point pipe 3 It is all pulled out with connecting tube 4, when the wired hose that the well-point pipe 3 and connecting tube 4 that use are an integral structure, excision ground Then connecting tube 4 more than table is in the milk in the well-point pipe 3 under earth's surface.It is full to ram, at least stop 7 after second time light ram It is carried out, 600 ~ 1000kN.m of energy level, is bulldozed after rammer;
Step 11: the absolute altitude of vibroroller cmpacting measurement in the whole field is handed over.
Note:Integral type well point plastic strip vacuum system can be pre- according to place and soil property situation adjustment spacing and length, vacuum Pressure, precipitation and it is light ram can according to place and soil property situation set-up procedure and pass and duration, ordinary circumstance descending water 3 ~ 4 times, It is light to ram 3 ~ 5 times.Construction period construction monitoring must synchronize progress, it is necessary to which the monitoring project of progress has:Pore water pressure, Level of ground water, ground settlement, delaminating deposition, vacuum degree realize information-aided construction.
Three groups of embodiments are supplemented below:
Embodiment one,
Essential information before basement process:
The ground third layer Muddy Bottoms clay layer water content 55%, compression modulus 2.3MPa, thickness is 15 meters average, and layer top is buried Deep 5m, 20 meters of layer bottom buried depth.
Implementation steps:
Step 1: levelling of the land, waits for that reinforcing area surrounding excavates draining ditch water discharge;
Step 2: pre- ram, energy level 800kN.m, square tamping point spacing 4m × 4m, construction cement mixing pile is laterally close after rammer Block wall or mud lateral seal barricade;
Step 3: integral type well point plastic strip vacuum system is arranged
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice;
The grid spacing 1.2m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plug depth 20m
The length of drain bar 1 is 14m, and the length of well-point pipe 3 is 6m, and the length of connecting tube 4 is 10cm.Well-point pipe 3 and The diameter 16mm of connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system,
3.3, one layer of geotextiles, two layers of diaphragm seal is covered in total pipe surface of integral type well point plastic strip vacuum system.
Step 4: vacuum preloading
Wait for that the cofferdam fill of reinforcing area surrounding, cofferdam fill height 1.5m height are taken out overseas surrounding source water and extremely added in advance 0.3 m in the cofferdam Gu Qu, then starts vacuum preloading seepage consolidation, suction underground water whole recharge to region surface to be reinforced, Reinforcing area surface is all annihilated by water to 1.0m height, is realized water covering prepressing, is covered water-stop, covers water seepage flow;
Its intermediate pump 7 is preferably sealed vacuum jet pump, and vacuum pump is vacuumized to be vacuumized using hierarchical loading:Vacuum It is full table 100kPa, Zong Guanmo that the pump hierarchical loading first order, which takes every 1800 squares of vacuum pump processing area, manifold first section negative pressure, End is not less than 90kPa, and processing waits for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 13 days, the vacuum pump hierarchical loading second level Every 1300 squares of vacuum pump processing area, processing is taken to wait for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 8 days, vacuum pump The hierarchical loading third level takes every 800 squares of vacuum pump processing area, and processing waits for that sedimentation meets sedimentation for three days on end after 8 days little In 3 millimeters, the vacuum pump hierarchical loading fourth stage takes every 600 squares of vacuum pump processing area, and sedimentation, which meets, after processing 15 days connects Sedimentation in continuous 5 days is not more than 2 millimeters, reaches vacuum preloading processing requirement;
Step 5: being carried out in the fill of cofferdam in the water to gutter stored in opening aerial drainage cofferdam fill, geotextiles are removed Diaphragm seal starts first pass vacuum dewatering preloading, 6 days, for the purpose of lowering of watertable, waits for that level of ground water reaches 4m, gradually Manifold preparations first pass at tamping point is removed gently to ram;
Step 6: first pass gently rams, energy level fixes tentatively 1500kN.m, square tamping point spacing 4m × 4m, is bulldozed after rammer;
Step 7: connection residue manifold and vacuum pump, second time vacuum dewatering preloading of beginning, 5 days, second time vacuum-dewatering It is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare second time light ram;
Step 8: second time light ram, energy level fixes tentatively 2000kN.m, square tamping point spacing 4m × 4m;Remove total tube edge in side It gently rams, gradually forward impelling, light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and is bulldozed after rammer;
Step 9: connection residue manifold and vacuum pump, start third time vacuum dewatering preloading 5 days, third is all over vacuum-dewatering It is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare full ram;
Step 10: remaining manifold is pulled out, and it is full to ram, stop 7 days after second time light ram and carry out, energy level 800kN.m rams pusher It is flat;
Step 11: vibroroller cmpacting is handed in the whole field.
Construction monitoring during the Foundation Treatment, negative pressure 80kPa at 6 meters of pore water pressure, negative pressure is average at 20 meters 30kPa, it is 8 meters that level of ground water, which declines maximum value, and it is 80cm fifty-fifty to descend 6 meters or so of water level decreasing, earth's surface average settlement amount, is pushed away It calculates the degree of consolidation and is not less than 80%,
Foundation detection, foundation bearing capacity are not less than 120kPa, and effective reinforcement depth is not less than 20 meters, is formed in 5 meters of shallow-layer Crust layer static sounding calculates that 5 ~ 8MPa of compression modulus, third layer Muddy Bottoms clay mechanics index of physics are obviously improved.
Embodiment two,
Essential information before basement process
The ground the 4th layer of Muddy Bottoms silty clay layer water content 38%, compression modulus 3.8MPa, thickness is 13 meters average, and layer top is buried Deep 3m, 16 meters of layer bottom buried depth.
Step 1: levelling of the land, waits for that reinforcing area surrounding excavates draining ditch water discharge;
Step 2: without the pre- rammer before precipitation, construct cement mixing pile lateral seal barricade or mud lateral seal gear Wall;
Step 3: integral type well point plastic strip vacuum system is arranged
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice;
The grid spacing 1.5m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plug depth 16m
The length of drain bar 1 is 10m, and the length of well-point pipe 3 is 6m, and the length of connecting tube 4 is 10cm.Well-point pipe 3 and The diameter 20mm of connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system,
3.3, one layer of geotextiles, two layers of diaphragm seal is covered in total pipe surface of integral type well point plastic strip vacuum system.
Step 4: vacuum preloading
Wait for that the cofferdam fill of reinforcing area surrounding, cofferdam fill height 1.0m height are taken out overseas surrounding source water and extremely added in advance 0.3m in the cofferdam Gu Qu, then starts vacuum preloading seepage consolidation, and suction underground water whole recharge adds to region surface to be reinforced Gu region surface is all annihilated by water to 0.8m height, realizes water covering prepressing, cover water-stop, cover water seepage flow;
Its intermediate pump 7 is preferably sealed vacuum jet pump, and vacuum pump is vacuumized to be vacuumized using hierarchical loading:Vacuum It is full table 100kPa, Zong Guanmo that the pump hierarchical loading first order, which takes every 2000 squares of vacuum pump processing area, manifold first section negative pressure, End is not less than 90kPa, and processing waits for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 10 days, the vacuum pump hierarchical loading second level Every 1500 squares of vacuum pump processing area, processing is taken to wait for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 7 days, vacuum pump The hierarchical loading third level takes every 800 squares of vacuum pump processing area, and processing, which settled to meet to settle for continuous 5 days after 15 days, to be not more than 2 millimeters, reach vacuum preloading processing requirement;
Step 5: being carried out in the fill of cofferdam in the water to gutter stored in opening aerial drainage cofferdam fill, geotextiles are removed Diaphragm seal starts first pass vacuum dewatering preloading, 7 days, for the purpose of lowering of watertable, waits for that level of ground water reaches 5m, gradually Manifold preparations first pass at tamping point is removed gently to ram;
Step 6: first pass gently rams, energy level fixes tentatively 1800kN.m, square tamping point spacing 4m × 4m, is bulldozed after rammer;
Step 7: connection residue manifold and vacuum pump, second time vacuum dewatering preloading of beginning, 7 days, second time vacuum-dewatering It is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare second time light ram;
Step 8: second time light ram, energy level fixes tentatively 2500kN.m, square tamping point spacing 4m × 4m;Remove total tube edge in side It gently rams, gradually forward impelling, light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and is bulldozed after rammer;
Step 9: connection residue manifold and vacuum pump, start third time vacuum dewatering preloading 7 days, third is all over vacuum-dewatering It is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare full ram;
Step 10: pulling out remaining manifold, full rammer stops 7 days after second time light ram and carries out, energy level 1000kN.m, after rammer It is bulldozed;
Step 11: vibroroller cmpacting is handed in the whole field.
Construction monitoring during the Foundation Treatment, negative pressure 86kPa at 6 meters of pore water pressure, negative pressure is average at 16 meters 45kPa, it is 8 meters that level of ground water, which declines maximum value, and it is 58cm fifty-fifty to descend 6 meters or so of water level decreasing, earth's surface average settlement amount, is pushed away It calculates the degree of consolidation and is not less than 80%,
Foundation detection, foundation bearing capacity are not less than 120kPa, and effective reinforcement depth is not less than 16 meters, is formed in 6 meters of shallow-layer Crust layer static sounding calculates that 8 ~ 13MPa of compression modulus, the 4th layer of Muddy Bottoms silty clay mechanics index of physics are obviously improved.
Embodiment three,
Essential information before basement process
The 2nd layer of Muddy Bottoms clay water content 78% of the ground, compression modulus 2.1MPa, thickness is 20 meters, layer top buried depth 4m average, 24 meters of layer bottom buried depth.
Step 1: levelling of the land, stabilization zone surrounding excavates draining ditch water discharge;
Step 2: the pre- rammer before precipitation, energy level 600kN.m, square tamping point spacing 4m × 7m, cement mixing of constructing after rammer Stake lateral seal barricade or mud lateral seal barricade;
Step 3: integral type well point plastic strip vacuum system is arranged
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice;
The grid spacing 1.0m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plug depth 24m
The length of drain bar 1 is 18.5m, and the length of well-point pipe 3 is 5.5m, and the length of connecting tube 4 is 10cm.Well-point pipe 3 And the diameter 16mm of connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system,
3.3, one layer of geotextiles, two layers of diaphragm seal is covered in total pipe surface of integral type well point plastic strip vacuum system.
Step 4: vacuum preloading
Wait for that the cofferdam fill of reinforcing area surrounding, cofferdam fill height 1.5m height are taken out overseas surrounding source water and extremely added in advance 0.3m in the cofferdam Gu Qu, then starts vacuum preloading seepage consolidation, and suction underground water whole recharge adds to region surface to be reinforced Gu region surface is all annihilated by water to 1.2m height, realizes water covering prepressing, cover water-stop, cover water seepage flow;
Its intermediate pump 7 is preferably sealed vacuum jet pump, and vacuum pump is vacuumized to be vacuumized using hierarchical loading:Vacuum It is full table 100kPa, Zong Guanmo that the pump hierarchical loading first order, which takes every 1800 squares of vacuum pump processing area, manifold first section negative pressure, End is not less than 90kPa, and processing waits for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 25 days, the vacuum pump hierarchical loading second level Every 1300 squares of vacuum pump processing area, processing is taken to wait for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 12 days, vacuum The pump hierarchical loading third level takes every 800 squares of vacuum pump processing area, processing to wait for that sedimentation meets after 12 days and settle for three days on end not More than 3 millimeters, the vacuum pump hierarchical loading fourth stage takes every 600 squares of vacuum pump processing area, and processing settles after 26 days to be met Sedimentation in continuous 5 days is not more than 2 millimeters, reaches vacuum preloading processing requirement;
Step 5: being carried out in the fill of cofferdam in the water to gutter stored in opening aerial drainage cofferdam fill, geotextiles are removed Diaphragm seal starts first pass vacuum dewatering preloading, 10 days, for the purpose of lowering of watertable, waits for that level of ground water reaches 4.5m, by Step is removed manifold preparations first pass at tamping point and is gently rammed;
Step 6: first pass gently rams, energy level fixes tentatively 1800kN.m, square tamping point spacing 4m × 7m, is bulldozed after rammer;
Step 7: connection residue manifold and vacuum pump, second time vacuum dewatering preloading of beginning, 5 days, second time vacuum-dewatering It is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare second time light ram;
Step 8: second time light ram, energy level fixes tentatively 2300kN.m, square tamping point spacing 4m × 7m;Remove total tube edge in side It gently rams, gradually forward impelling, light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and is bulldozed after rammer;
Step 9: connection residue manifold and vacuum pump, start third time vacuum dewatering preloading 10 days, third is all over vacuum-dewatering It is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare third all over light rammer;
Step 10: third is rammed all over light, energy level 2800kN.m, square tamping point spacing 4m × 7m;Side is removed total tube edge and is gently rammed, Gradually forward impelling, light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and is bulldozed after rammer;
Step 11: connection residue manifold and vacuum pump, the vacuum dewatering preloading 10 days of beginning the 4th time, the 4th time vacuum drop It is gradually retained after the completion of water for prepressing precipitation and removes part manifold at tamping point and prepare full ram;
Step 12: remaining manifold is pulled out, and it is full to ram, stop 7 days after light ram in third and carry out, energy level 1000kN.m is rammed After be bulldozed;
Step 13: vibroroller cmpacting is handed in the whole field.
Construction monitoring during the Foundation Treatment, negative pressure 83kPa at 6 meters of pore water pressure, negative pressure is average at 15 meters 40kPa, negative pressure 20kPa at 24 meters, it is 6.5 meters that level of ground water, which declines maximum value, fifty-fifty descends 5 meters or so of water level decreasing, earth's surface Average settlement amount is 118cm, calculates that the degree of consolidation is not less than 80%,
Foundation detection, foundation bearing capacity are not less than 120kPa, and effective reinforcement depth is not less than 24 meters, shape in 5.5 meters of shallow-layer Calculate that 5.5 ~ 9MPa of compression modulus, the 2nd layer of Muddy Bottoms clay mechanics index of physics are obviously improved at crust layer static sounding.

Claims (1)

1. a kind of construction method of integral type well point plastic strip pipe, which is characterized in that integral type well point plastic strip pipe includes drain bar, connects Box, well-point pipe and connecting tube are connect, one end of drain bar is connected by connecting one end of box and well-point pipe, the other end of well-point pipe It is connect with one end of connecting tube;
Drain bar includes the filter membrane of internal core plate and core plate periphery, and drainage channel, institute are formed between the core plate and filter membrane It states core plate to be made of non-degradable material or material difficult to degrade, the filter membrane is made of degradation material;
Core plate includes the main gusset and the more longitudinally spaced secondary gussets being arranged in before and after main gusset of a lateral arrangement, described The gap formed between main gusset, secondary gusset and filter membrane is drainage channel;
The connecting tube is wired hose, and connecting tube includes hose and the spiral wire of Lining Hose;
In use, the drain bar is vertically arranged in deep soil, the well-point pipe is vertically arranged in shallow soil body, is drained The upper end of plate is connected by connecting the lower end of box and well-point pipe, and the upper end exposing shallow soil of well-point pipe is external, the upper end of well-point pipe It is connect with one end of connecting tube;
Use the Specific construction step of the integral type well point plastic strip pipe for:
Step 1: levelling of the land, waits for that reinforcing area surrounding excavates draining ditch water discharge;
Step 2: selecting without or carrying out the pre- rammer before precipitation according to soil condition, it is bulldozed after rammer;
Step 3: integral type well point plastic strip vacuum system is arranged
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice;
1 ~ 4m of grid spacing of integral type well point plastic strip pipe network lattice is adjustable;
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system;
3.3, one layer of geotextiles, two layers of diaphragm seal is covered in total pipe surface of integral type well point plastic strip vacuum system;
Step 4: vacuum preloading
It waits for that the cofferdam fill of reinforcing area surrounding, cofferdam fill height are 0.6 ~ 1.5m, takes out reinforcing area outside source water in advance To waiting in reinforcing area cofferdam so that the high 0.2 ~ 0.6m of water, then integral type well point plastic strip vacuum system starts vacuum preloading, very The recharge of underground water whole is aspirated when empty precompressed to region surface to be reinforced, region surface to be reinforced all is annihilated by water to certain height Degree realizes water covering prepressing, covers water-stop;
Step 5: being carried out in the fill of cofferdam in the water to gutter stored in opening aerial drainage cofferdam fill, geotextiles sealing is removed Film starts first pass vacuum dewatering preloading, and 5 ~ 10 days are adjustable, for the purpose of lowering of watertable, wait for that level of ground water reaches requirement, Manifold at tamping point is gradually removed, prepares first pass and gently rams;
Step 6: first pass gently rams, energy level fixes tentatively 1500 ~ 2000kN.m, and 4 × 4 ~ 7 × 7m of square tamping point spacing is adjustable, side It removes total tube edge gently to ram, gradually forward impelling, light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and rams pusher It is flat;
Step 7: integral type well point plastic strip pipe Mesh connection residue manifold and vacuum pump, second time vacuum dewatering preloading of beginning, 5 ~ 10 days adjustable, is gradually retained and removes part manifold at tamping point after the completion of second time vacuum dewatering preloading precipitation, prepares second It is rammed all over light;
Step 8: second time light ram, energy level fixes tentatively 2000 ~ 2800 kN.m, and 4 × 4 ~ 7 × 7m of square tamping point spacing is adjustable; Side is removed total tube edge and is gently rammed, gradually forward impelling, and light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and rams pusher It is flat;
Step 9: integral type well point plastic strip pipe Mesh connection residue manifold and vacuum pump, beginning third time vacuum dewatering preloading, 5 ~ 10 days adjustable, and third is gradually retained and removes part manifold at tamping point after the completion of vacuum dewatering preloading precipitation, prepares full ram;
Step 10: remaining manifold is pulled out, and it is full to ram, at least stop 7 days after second time light ram and carries out, 600 ~ 1000kN.m of energy level, It is bulldozed after rammer;
Step 11: vibroroller cmpacting, measurement absolute altitude are handed in the whole field.
CN201610379658.7A 2016-06-01 2016-06-01 Integral type well point plastic strip pipe Active CN105862716B (en)

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CN106703009A (en) * 2017-01-05 2017-05-24 天津大学 Vacuum preloading drainage assembly
CN107217661A (en) * 2017-05-23 2017-09-29 浙江省水利水电勘测设计院 A kind of Soft Ground Improved By Vacuum Preloading ruggedized construction of base expanding and base expanding Pressure water discharging joint inflation drainage

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