CN105970909B

CN105970909B - Well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method

Info

Publication number: CN105970909B
Application number: CN201610379646.4A
Authority: CN
Inventors: 张禹
Original assignee: Cabr Foundation Engineering Co Ltd
Current assignee: Cabr Foundation Engineering Co Ltd
Priority date: 2016-06-01
Filing date: 2016-06-01
Publication date: 2018-06-15
Anticipated expiration: 2036-06-01
Also published as: CN105970909A

Abstract

A kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method of the present invention, it is characterised in that it includes the following steps：First, levelling of the land, area sewerage to be reinforced；Then, select without or carry out the pre- rammer before precipitation；Then, plastic strip vacuum system in integral type well point is arranged；Then, vacuum preloading treats the cofferdam fill of reinforcing area surrounding, takes out reinforcing area outside source water in advance to treating in reinforcing area cofferdam, then starts vacuum preloading, and suction underground water whole recharge is to region surface to be reinforced during vacuum preloading；Then, vacuum dewatering preloading carries out the water stored in opening aerial drainage cofferdam fill in the fill of cofferdam, starts multipass vacuum dewatering preloading, set between adjacent vacuum dewatering preloading twice it is primary it is light ram, carry out expiring rammer after last time vacuum dewatering preloading；Finally, the absolute altitude of vibroroller cmpacting measurement in the whole field is handed over.The present invention has the advantages that easy to operate, of low cost, construction effect is good.

Description

Well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method

Technical field

The present invention relates to a kind of Treatment Methods of Soft Ground more particularly to a kind of well point plastic strip vacuum preloading seepage consolidation to join Close precipitating, pre-pressing dynamic consolidation method.

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 formed.Building is carried out on soft foundation to apply Before work, need first to carry out consolidation process to soft foundation, conventional consolidation processing methods have following several：

First, conventional vacuum ground preloading, conventional vacuum ground preloading " land and river sea lakes and marhshes domain is underwater " soft soil foundation are equal It needs to be laid with diaphragm seal, sand bedding course, but have the following disadvantages：

1st, large area diaphragm seal difficulty of construction is big, and land vacuum preloading needs a large amount of artificial plastic film mulch mechanization degrees low, especially It is that underwater vacuum precompression diaphragm seal is more difficult to construct；

2nd, pvc seals the low easy damaged gas leakage of film-strength, two layers of diaphragm seal, one layer of geotextiles cost height, searches air leakage point It is difficult；

3rd, a large amount of pvc diaphragm seals are not environmentally；

4th, for earth's surface maximum up to negative pressure 80kPa, negative pressure is fast toward soil layer deep slippages, general to be transmitted often toward deep under film Rice loss negative pressure 10kPa or so, the following soft soil vacuum preloading effect of 8 to 10 meters or so of earth's surface is poor, and effective reinforcement depth is shallow；

5th, the in situ table of loading surface or backfill earth's surface, even if surface layer diaphragm seal is air tight, the stabilization zone surrounding shallow-layer soil body Slow gas leakage can not still be ignored, and in the case of especially 90 days or so long time loadings, decline in level of ground water and add to a certain extent Gu area's surrounding shallow soil body drain gas degree more causes anxiety.

2nd, follow-on vacuum pre-press reinforcing has the following disadvantages：

1st, sand bedding course is gone to be changed to the direct-connected plastic strip plate mode of hand-type connector, changes indirect transfer negative pressure directly to transmit negative pressure mould Formula, but its there is still a need for diaphragm seals, peak suction loading surface is still in earth's surface；

2nd, serous fluid of dredger fill forms sealant or the direct-connected plastic strip of vacuum manifold and buries 1.5 meters or so or 3 meters of vacuum chimney filter underground Left and right sides plastic uptake arranges replacement seal film, and 10 days vacuum preloading initial stages right-left seal is preferable, but as serous fluid of dredger fill dehydration consolidation is opened It splits, level of ground water rapid decrease, sealing effect is had a greatly reduced quality；

3rd, reclaim fields from the sea ultra-soft soil can not mechanical execution, first do artificial plate shallow-layer plastic strip vacuum preloading, treat that its ground is strong Degree is suitble to mechanical execution, then does deep vacuum precompressed, reclaim fields from the sea ultra-soft soil vacuum preloading and conventional vacuum precompressed principle technique Almost consistent, only artificial and machinery simple difference, process is more complicated, and cost is high, efficiency is low；

90 days underground water level decreasings of vacuum preloading are typically only 1 ~ 3 meter, and practical application generally handles deep soft soil foundation, shallow Layer is ineffective, theoretically reinforces groundwork bearing capacity and is generally 80kPa or so, and practical application superficial layer foundation bearing capacity is past Toward too low or even only 30 ~ 50kPa.

3rd, vacuum-dewatering joint dynamic consolidation construction has the following disadvantages：

1st, Application of light well point precipitation+strong rammer

Traditional manifold and branch pipe, general 6 meters of branch pipe depth, well point spacing is generally 4*4m, using vacuum-dewatering, only drops Water or precipitating, pre-pressing function cannot have both vacuum preloading negative pressure consolidation simultaneously since the depth as shallow spacing big time is short；

2nd, tube well dewatering or deep-well precipitation+strong rammer

Traditional manifold and branch pipe, pipe well use immersible pump gravity precipitation, and deep-well precipitation is using immersible pump gravity precipitation and very The mode that airborne water combines, well-point arrangement spacing bigger, general 15*15m, thick and thin processing mode lay particular emphasis on precipitation, due to The spacing excessive time is short cannot to have both vacuum preloading negative pressure consolidation simultaneously；

What Dewatering dynamic compaction Ground Treatment was dredged due to precipitation is thick layout and in short term（30 days or so）Processing mode is suitable only for shallow-layer Processing；

In place of above all methods are in the presence of that can improve and optimize.

Invention content

The purpose of the present invention is to overcome the above shortcomings and to provide a kind of wells easy to operate, of low cost, construction effect is good Point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method.

The object of the present invention is achieved like this：

Compared with prior art, the beneficial effects of the invention are as follows：

1st, sealing system improves one：

Cancel geotextiles geomembranes, sand bedding course, by by the shallow-layer at the well-point pipe of integral type well point plastic strip vacuum system The soil body is as first of sealant；Sealing effect is good, and construction is simple is reliable, saves material；

2nd, sealing system improves two：

Region surface to be reinforced in cofferdam covers water-stop, forms second sealant；

3rd, Vacuum Loading System improves one：

Conventional vacuum precompressed, the loading of 80KPa negative pressure of vacuum is each provided at earth's surface, and after improvement, 80KPa negative pressure maximum value is located at ground The following shallow-layer soil body of table and deep soil junction, are improved centainly theoretically by improving vacuum preloading effective reinforcement depth Depth（The depth of first of sealant i.e. the shallow-layer soil body）, while reduce and treat reinforcing area surrounding shallow-layer sealing effect not The good negative effect brought；

4th, Vacuum Loading System improves two：

Conventional vacuum precompressed using etc. carry compression system, in addition to early period in order to check leaking source and slow down plastic strip earth pillar and formed Turn on pump rate 60% ~ 80%, later stage maintain negative pressure is energy saving also turn on pump rate to be maintained to be not less than 80%, and other situations were both unchanged, improved Afterwards, using hierarchical loading, until settling stabilization under this grade of negative pressure load, level-one load level is then improved again and continues to add Pressure until stablizing, recycles successively, steps up zone negative pressure to be reinforced to maximum value, similar to static load test hierarchical loading, Also the work progress of construction multistage loadings is simulated, consolidation pattern is loaded for allergic effect power path, in practice it has proved that, conventional vacuum Although realizing earth's surface negative pressure 80kPa load levels, it is full that the following different depth soil body of earth's surface reaches far away more than 80kPa for precompressed Load state, this is a larger mistaken ideas, theoretically can be by infinitely increasing vacuum pump quantity by hierarchical loading after improvement Realize that the fully loaded negative pressure that the different depth soil body reaches more than theoretical limit 80kPa reinforces state.This improvement greatly improves Vacuum preloading limit consolidation effect, and conventional vacuum precompressed is difficult to improve vacuum pump quantity realization hierarchical loading, reason It is：First, the more difficult random increase vacuum pump quantity of sealing system membrane system complex, can only once have been laid by preset quantity Into, vacuum pump quantity can not be adjusted according to monitoring data and realize dynamic load, secondly, be continuously increased with vacuum pump quantity, ground Lower water level decreasing is too fast, and the level of ground water more than surrounding soil body forms larger leaking source, conventional to use clay envelope wall soil cement Envelope wall etc. seems helpless less effective in face of the huge leaking source of semi-infinite body ground, the ground that process materials limit at present The slow gas leakage that table sealing system shows under ever-increasing vacuum level causes to form the cycle of a limiting equilibrium, therefore There are one the vacuum pump quantity balanced, the every vacuum pump processing area 800 ~ 1500 also often said in specification is flat for conventional vacuum precompressed Side.This is also vacuum preloading 90 days, the theoretical source of 800 ~ 1500 squares of fixed pattern conclusions of every vacuum pump processing area, improves Afterwards, the groundwater recharge of suction forms reinforcing area body of groundwater seepage flow self-loopa to ground surface layer or recharge to ground surrounding System preferably realizes the vacuum preloading of hierarchical loading；

5th, Vacuum Loading System improves three：

Conventional vacuum covers the loading effect that aqueous mode only has water-water reactor to carry in advance, due to the presence of diaphragm seal, has cut off and has covered water It is fed to soil mass consolidation seepage flow, it is impossible to underground water self-circulation system is formed, effect is had a greatly reduced quality, after improvement, the underground water of suction To foundation surface, the seepage flow under bulk water+suction function is replenished to ground formation cycle for recharge, is taken out by the way that turn on pump rate is controlled to realize Water Spreading and seepage flow appropriate balance, not for the purpose of lowering of watertable, and for the purpose of realizing seepage consolidation, cover Water Spreading system The larger effect of 20 days water yields is preferable before system has avoided the occurrence of conventional vacuum precompressed, and gradually reduces jet pump with water yield Efficiency reduces, negative pressure is low, and sealing system reduces less effective in level of ground water because circulating water temperature height generates for jet pump, The problems such as vacuum preloading effect gradually reduces, this improves most important theory and is the discovery that：1st, water is reduced as negative pressure carrier ratio Soil body interstitial air after water level is conducive to consolidate as negative pressure carrier, it can be understood as seepage consolidation or the flow of water are poor（Negative pressure is drawn It rises）Seepage consolidation, and water is small as the transmission negative pressure loss of negative pressure carrier, is thus extended to the simple realization of underwater vacuum precompression. 2nd, precipitating, pre-pressing effect is not obvious, and it is theoretical to deduct the increased precipitating, pre-pressing of water buoyancy dead weight for the level of ground water more than soil body after precipitation Actual measurement performance is general, and principle is it is still necessary to further study, even if assuming that soil body dead weight increases, but level of ground water after precipitation after precipitation More than soil strength has also obtained larger raising, opposite raising and crust layer of the level of ground water more than soil body due to intensity simultaneously Soil arching effect counteracts pre-compressed effect of the increase to the lower part soil body of its dead weight, and actual measurement level of ground water reduces excessive too fast（It reduces To lower 8 meters or so of earth's surface, do not include usually 7 meters or so of negative pressure level of ground water decline caused by overload also in 70kPa, to 8 meters Following soil body surcharge preloading, consolidation settlement should significantly increase, but actual measurement is unsatisfactory, and stablizes quickly）, in super quiet pore water Soil solidifying is stablized too early relatively instead under the premise of pressure is almost unchanged, so inferring, lowering of watertable causes ground to sink The non-water buoyancy disappearance soil body dead weight of drop main cause, which increases, to be caused, and mainly flow of water difference causes ground caused by seepage force to sink Drop, at least seepage force are the leading factor that sedimentation occurs, so lowering of watertable need not be used to form precipitating, pre-pressing enhancing Vacuum preloading effect.3rd, conventional vacuum precompressed level of ground water reduces general 2 ~ 3 meters of unobvious, 90% below 2 ~ 3 meters of levels of ground water Soft soil foundation vacuum preloading carries out under water or in water in fact, illustrates that lowering of watertable vacuum preloading not can be achieved on And negative pressure transmission effect it is more preferable；

It is improved to based on above-mentioned analysis：Lowering of watertable does not cover Water Spreading vacuum method and constructs, realization water covering prepressing, It covers water seepage flow, cover water-stop, vacuum preloading seepage consolidation measured result is preferable.

Seepage consolidation and people a closely bound up simple illustration of living is exactly：Potting " the cohesive soil soil body " is poured repeatedly After water easily it is hardened, " into domestic and international soil scientist for a long time long unassailable difficult scientific problems ".About potting soil plate Knot：Have salinity increase, have calcium ions and magnesium ions tap water hardness it is big, have microorganism species, have chemical fertilizer effect.This patent Caused by thinking soil hardening main cause and being aforementioned " seepage consolidation " physical action：Watering, which forms repeatedly seepage consolidation, repeatedly is The Main physical reason that the soil body is hardened is caused, the potting stickiness soil body meets water strength reduction and seepage consolidation double action, in seepage flow The soil body is closely knit under power and flow of water difference physical action, and multiple alternation of wetting and drying unified with nature transpiration forms hardened crust layer phenomenon.It is and normal It is hardened that rule solve potting：Water storage watering mode at potting bottom tray is hardened by the way that seepage consolidation is avoided to reduce；Potting must be slowly Watering flood cannot be avoided to water flowers soon very much, be by reduce seepage pressure, percolation flow velocity reduce it is hardened；Using cohesive soil and sand Native mix solve it is hardened, be in fact of both reason, 1, accelerate percolation flow velocity and reduce seepage pressure because bernoulli principle is accused Tell us, the sum of the pressure potential of any two points, kinetic energy and geopotential energy remain unchanged on streamline, when mix gravel waters in clay Seepage velocity soon then to the soil body generate pressure with regard to small, consolidation will be slow, it is hardened also can be slow；2nd, mix gravel increases in cohesive soil The intensity of the soil body is added, smaller, reduction hardened phenomenon is deformed under seepage force effect.

" seepage consolidation " another simple illustration is the formation of the natural isabelline clay crust layer of earth's surface, Crust Layer shape It can also be explained into reason with " seepage consolidation " physical action repeatedly, repetitious rainfall infiltration consolidation is meeting water clay Strength reduction and seepage consolidation double action following table layer soil body are closely knit, then solarization wind water transpiration earth's surface alternation of wetting and drying natural shape It is exactly the same into hardened crust layer phenomenon and potting hardened phenomenon.

6th, vaccum pump unit improves

Conventional vacuum precompressed carries out vacuum preloading using open type from the jet pump that overflows, and is improved to conventional light well point and is used Sealed vacuum jet pump, convenient for maintaining, extend service life of equipment, while be easy to implement vacuum preloading and precipitation is strong The perfect linking of construction is rammed, " vacuum is completed using the same integral type well point plastic strip vacuum systems of the same manifold of same equipment The foundation stabilization task of 3 kinds of precompressed, precipitating, pre-pressing, dynamic consolidation " or more.

7th, the improvement of manifold：

Conventional vacuum precompressed manifold is equal diameter pvc pipe or is embedded to filter pipe etc. in layer of sand, and improvement transverse tube, which uses, to be carried certainly The transverse tube segmentation of the necking section of venturi jet stream effect processed improves vacuumizing effect, in addition substitutes tradition three using mostly logical linkage section It is logical to improve tubing utilization rate and efficiency of assembling and reduce polylinker leaking source；

8th, drain bar improves：

Conventional Degradable plastic water drainage plate is core plate degradation, and practical degradation effect is bad, improves drain bar and uses filter membrane Degradable biological material, does not stay drainage channel to reduce settlement after construction after environmental protection and work, core plate reduces cost simultaneously without degradation Core plate is as reinforcement material reinforcing soft soil；

9th, the remaining plastic draining board of conventional vacuum precompressed often causes certain residual settlement after work, especially construction time Between fail the soft soil foundation fully consolidated, the slow consolidation settlement under load long term after work, formed disease, after improvement, one The superstructure of body formula well point plastic strip pipe（Connect box, well-point pipe and connecting tube）It can pull out, gently be rammed in vacuum preloading, precipitation After the completion, the superstructure of integral type well point plastic strip pipe is pulled out using pipe extractor, the superstructure of integral type well point plastic strip pipe can With recycling, while the drain bar filter membrane degradation under earth's surface in shallow soil body under noresidue drainage channel, the shallow-layer soil body is realized Drainage channel is not stayed after whole work, reduces residual settlement after work；

10th, conventional vacuum precompressed suction underground water, be easy to cause the larger sedimentation of ambient enviroment, covers Water Spreading by being improved to Lowering of watertable vacuum seepage preloading method is not constructed, it is possible to reduce the influence to ambient enviroment；

11st, Water Spreading not lowering of watertable is covered, vacuum dewatering preloading manifold and branch pipe water yield are big, underground water Zhou Erfu The cycle that begins seepage flow, it is ensured that vacuum pump and manifold, manifold system work in the case where full water expires negative pressure state, form negative pressure height, and actual measurement is adopted Large-area treatment region can be allowed to reach 90 ~ 100kPa of negative pressure with less vacuum pump expires table status, and vacuum pump will not go out Existing water shortage burns pump phenomenon；

12nd, conventional precipitation gently rams well point mechanical hole building and does not often take out water formation dried-up well, general to recommend to use artificial water Rush 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, spacing of layouting due to It looks after and rams walking and be also impossible to too close, it is height-limited that light well point vacuum-dewatering principle limits water lift, at present document finding Most deep light well point considers precipitation funnel, therefore level of ground water reduces limit depth only 4 ~ 5 meters of left sides also just at 7 meters or so The right side, being required to backfill medium coarse sand ensures water recharging, and water yield is smaller, and vacuum jet pump negative pressure is caused to reduce very fast influence vacuum Dewatering effect, at the same cause that gas leakage negative pressure in well point is not high and work after there are sand drains to continue the unfavorable factors such as drainage subsidence, therefore now Follow-on Dewatering dynamic compaction prevalence use deep-well precipitation or tube well dewatering, but in view of two kinds of dewatering modes layout can not possibly it is too close, It can only play the role of precipitation, it is difficult to play vacuum preloading, integral type well point plastic strip vacuum system, filter depth can be than true Empty 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 have Conducive to vacuum preloading, realize that mechanized construction pore-forming efficiency is high, since filter uses the higher overlength plastic draining board of water-flowing amount, Dried-up well rate is almost nil, and either precipitation depth is also or precipitation efficiency perfect can substitute above-mentioned various well-points dewatering completely It is light to ram mode；

13rd, conventional vacuum precompressed plastic draining board top is located at ground surface, and light ram can cause place large area water outlet, table soil Layer water content is excessively high, then influences light rammer construction and quality；After improvement, tamping point position well point branch pipe is extracted, and region is rammed close to light Periphery connection manifold, which continues to draw water, keeps level of ground water, therefore even if gently being rammed in the point, underground flood peak is also impossible to break through shallow soil Body seepage flow is gently rammed to earth surface effects, it is ensured that light rammer construction drying is anhydrous；

14th, early period covers Water Spreading vacuum preloading seepage consolidation consolidated subsoil using not lowering of watertable, treats vacuum preloading Settlement stability opens the water that cofferdam aerial drainage stores（Conventional depth of water 50cm or so）, continue quick lowering of watertable and play to take into account While the vacuum preloading of precipitating, pre-pressing effect, the first pass dewatering construction of Dewatering dynamic compaction is completed, can quickly be reduced after improvement Level of ground water is to 5 ~ 8 meters, so that strong rammer dynamic consolidation increases energy level and influence depth and ensures do not occur spongy soil simultaneously, often It advises Dewatering dynamic compaction level of ground water and generally only declines 2 ~ 3 meters or so, less effective.

15th, conventional vacuum precompressed dewatering effect is not good enough, and conventional Dewatering dynamic compaction does not have vacuum preloading effect, integral type well point Plastic strip vacuum system lays a large amount of drain bar and replaces shorter filter, you can, can also to realize quick lowering of watertable Efficiently realize vacuum seepage precompressed, a kind of 2 kinds of effects of material, the purpose of one material multipurpose efficiency energy saving of realization；

16th, conventional vacuum precompressed superficial layer Effect of Ground Treatment be not good enough, and conventional Dewatering dynamic compaction processing depth is not good enough, is improved to " well Point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method, having both vacuum preloading, precipitating, pre-pressing, precipitation, gently rammer is more Weight effect, deep shallow layer foundation are reinforced simultaneously, under the premise of using vacuum preloading deep soil preferably consolidation, using cycle seepage flow Precompressed, precipitating, pre-pressing and Dewatering dynamic compaction form 6 meters or so of crust layer at the shallow-layer soil body, and multiple effect increases the pressure of the soil body Close effect reduces settlement after construction, and the improvement completes multiple reinforcing task in the case where not increasing larger cost reasons, especially It is suitable for work China Democratic National Construction Association workshop storage grounds and airfield runway, town road and railway bed etc..

17th, lakes and marhshes domain underwater vacuum precompression in river sea is improved to no film without sand only integrated construction formula well point by above-mentioned analysis Plastic strip system, it is underwater to connect manifold, form underground water reciprocation cycle seepage flow 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 body formula well point plastic strip system at least should be greater than 6 meters of depth of land setting, will according to soil properties and reinforcing It asks and adjusts accordingly.

18th, cohesive soil Backfill Foundation especially collapsible loess is fallen consolidation settlement in the case where covering Water Spreading systemic effect, Densification effect is more preferable under chance water strength reduction and seepage consolidation double action, preferably simulates and is utilized nature air and follow The supply of ring rainwater and then the hardened crust layer phenomenon of solarization wind water transpiration earth's surface alternation of wetting and drying self-assembling formation, are particularly suitable for the work people Construct the factory buildings storage ground and airfield runway, town road and railway bed etc..

19th, the method is more suitable for ultra-soft foundation reinforcing of reclaiming fields from the sea, and realization method is to pass through simple artificial insertion one Shallow-layer vacuum preloading seepage consolidation and the multiple effect of precipitating, pre-pressing under the premise of the preferable fast sealing of body formula well point plastic strip system realization Fruit.

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 structure 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 structure 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, housing 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 5.2nd, 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 embodiment

Referring to Fig. 1 ~ Fig. 9, a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing power of the present invention Concretion method, it includes the following steps：

Step 1: levelling of the land, treats that reinforcing area surrounding excavates draining ditch water discharge；

Step 2: according to soil condition selection without or carry out the pre- rammer before precipitation, energy level fixes tentatively 600 ~ 1000kN.m, square tamping point spacing 4*4 ~ 7*7m can adjust, be bulldozed after rammer, and construction water-stop curtain 8, sealing curtain 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

3.1st, 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 1.1 periphery of internal 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 uses degradation material to be made, filter membrane 1.2 realize fast degradations, filter membrane 1.2 degrade after in ground only remaining core plate 1.1, the soil in ground can fill former filter membrane 1.2 and the space of former drainage channel 1.3 so that soil is fitted closely with core plate 1.1, therefore 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, improve 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 housing 2.1, and there are one kissed with 1 upper end shape of drain bar for the lower end setting of the housing 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 housing 2.1 there are three screw hole 2.4, the rectangular in cross-section structure of the lower interface 2.2, drain bar 1 during 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 during 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 with 4 junction of connecting tube by diaphragm seal 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.

3.2nd, 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.

The transverse tube 5 is formed by connecting by multiple transverse tubes segmentation 5.1 and mostly logical linkage section 5.2, two neighboring transverse tube segmentation It is attached between 5.1 by mostly logical linkage section 5.2, mostly logical linkage section 5.2 is as a kind of logical preferably using eight logical linkage sections, eight 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 three connection interface tubes 5.23 is forwardly and rearwardly respectively arranged in section main body 5.21, connection interface tube 5.23 is adjacent Connecting tube 4 is attached, and adjacent 5.1 connection of transverse tube segmentation of transverse tube segmentation interface 5.22, the transverse tube segmentation 5.1 includes One necking section, necking section are set 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 5.13 small head end docking, the transverse tube segmentation interface of stub end more logical linkage sections 5.2 adjacent thereto of the first Taper Pipe section 5.12 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 connected by multiple longitudinal tubule (L tubule)s segmentation 6.1 and three-way connection 6.2 and Into 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 horizontal stroke 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.

Step 4: vacuum preloading

Treat the cofferdam fill of reinforcing area surrounding, fill height 0.6 ~ 1.5m height in cofferdam takes out reinforcing area outside in advance Source water is to treating 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 during vacuum preloading To certain altitude, realize 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 The pump hierarchical loading first order takes every 1800 ~ 2000 squares of vacuum pump processing area adjustable, and manifold first sections negative pressure is full table 100kPa, total pipe end are not less than 90kPa, treat that sedimentation meets sedimentation for three days on end no more than 3 millimeters, vacuum pump hierarchical loading the Two level takes every 1300 ~ 1500 squares of vacuum pump processing area adjustable, treats 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 to settle Meet sedimentation in continuous 5 days no 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, start first pass Vacuum dewatering preloading, 5 ~ 10 days adjustable, for the purpose of lowering of watertable, treats that level of ground water reaches requirement（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 square tamping point spacing 4*4 ~ 7*7m can adjust, 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 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, gradually water conservation and removes part manifold at tamping point after the completion of second time vacuum dewatering preloading precipitation and prepares It is second time light to ram；

Step 8: second time light ram, energy level fixes tentatively 2000 ~ 2800 kN.m or more, square tamping point spacing 4*4 ~ 7*7m It 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 gradually water conservation and is removed part manifold at tamping point and prepared after the completion of the vacuum dewatering preloading precipitation 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 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

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.

3.2nd, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system,

Step 4: vacuum preloading

Treat the cofferdam fill of reinforcing area surrounding, fill height 1.5m height in cofferdam is taken out overseas surrounding source water and extremely added in advance 0.3 m in Gu Qu cofferdam, 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 The pump hierarchical loading first order takes every 1800 squares of vacuum pump processing area, and manifold first sections negative pressure is full table 100kPa, Zong Guanmo End is not less than 90kPa, and sedimentation satisfaction is treated in processing after 13 days sedimentation is no more than 3 millimeters for three days on end, the vacuum pump hierarchical loading second level Every 1300 squares of vacuum pump processing area is taken, processing treats 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 treats 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 reaches vacuum preloading processing requirement no more than 2 millimeters；

Step 5: being carried out in the fill of cofferdam in the water to gutter stored in opening aerial drainage cofferdam fill, start first pass Vacuum dewatering preloading 6 days, for the purpose of lowering of watertable, treats that level of ground water reaches 4m, gradually removes manifold at tamping point and prepares First pass gently rams；

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 gradually water conservation and removes part manifold at tamping point and prepares second time light ram after the completion of precompressed precipitation；

Step 8: second time light ram, energy level fixes tentatively 2000kN.m, square tamping point spacing 4m*4m；It is light that total tube edge is removed on side It 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 gradually water conservation and removes part manifold at tamping point and prepares full ram after the completion of precompressed precipitation；

Step 10: remaining manifold, well-point pipe are pulled out, and it is full to ram, stop 7 days after second time light ram and carry out, energy level 800kN.m is bulldozed after rammer；

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 averaged at 20 meters 30kPa, it is 8 meters that level of ground water, which declines maximum value, fifty-fifty descends 6 meters or so of water level decreasing, and earth's surface average settlement amount is 80cm, is pushed away The degree of consolidation is calculated 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 5 ~ 8MPa of compression modulus, and third layer Muddy Bottoms clay mechanics index of physics is 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 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

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.

Step 4: vacuum preloading

Treat the cofferdam fill of reinforcing area surrounding, fill height 1.0m height in cofferdam is taken out overseas surrounding source water and extremely added in advance 0.3m in Gu Qu cofferdam, 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 The pump hierarchical loading first order takes every 2000 squares of vacuum pump processing area, and manifold first sections negative pressure is full table 100kPa, Zong Guanmo End is not less than 90kPa, and sedimentation satisfaction is treated in processing after 10 days sedimentation is no more than 3 millimeters for three days on end, the vacuum pump hierarchical loading second level Every 1500 squares of vacuum pump processing area is taken, processing treats 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, start first pass Vacuum dewatering preloading 7 days, for the purpose of lowering of watertable, treats that level of ground water reaches 5m, gradually removes manifold at tamping point and prepares First pass gently rams；

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 gradually water conservation and removes part manifold at tamping point and prepares second time light ram after the completion of precompressed precipitation；

Step 8: second time light ram, energy level fixes tentatively 2500kN.m, square tamping point spacing 4m*4m；It is light that total tube edge is removed on side It 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 gradually water conservation and removes part manifold at tamping point and prepares full ram after the completion of precompressed precipitation；

Step 10: remaining manifold, well-point pipe are pulled out, and it is full to ram, stop 7 days after second time light ram and carry out, energy level 1000kN.m is bulldozed after rammer；

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 averaged at 16 meters 45kPa, it is 8 meters that level of ground water, which declines maximum value, fifty-fifty descends 6 meters or so of water level decreasing, and earth's surface average settlement amount is 58cm, is pushed away The degree of consolidation is calculated 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 8 ~ 13MPa of compression modulus, and the 4th layer of Muddy Bottoms silty clay mechanics index of physics is 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

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.

Step 4: vacuum preloading

Treat the cofferdam fill of reinforcing area surrounding, fill height 1.5m height in cofferdam is taken out overseas surrounding source water and extremely added in advance 0.3m in Gu Qu cofferdam, 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 The pump hierarchical loading first order takes every 1800 squares of vacuum pump processing area, and manifold first sections negative pressure is full table 100kPa, Zong Guanmo End is not less than 90kPa, and sedimentation satisfaction is treated in processing after 25 days sedimentation is no more than 3 millimeters for three days on end, the vacuum pump hierarchical loading second level Every 1300 squares of vacuum pump processing area is taken, processing treats 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, and processing is treated that sedimentation meets and settled for three days on end not after 12 days 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 reaches vacuum preloading processing requirement no more than 2 millimeters；

Step 5: being carried out in the fill of cofferdam in the water to gutter stored in opening aerial drainage cofferdam fill, start first pass Vacuum dewatering preloading 10 days, for the purpose of lowering of watertable, treats that level of ground water reaches 4.5m, gradually removes manifold at tamping point Prepare first pass gently to ram；

Step 6: first pass gently rams, energy level fixes tentatively 1800kN.m, square tamping point spacing 4m*7m, is bulldozed after rammer；

Step 8: second time light ram, energy level fixes tentatively 2300kN.m, square tamping point spacing 4m*7m；It is light that total tube edge is removed on side It 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 gradually water conservation and removes part manifold at tamping point and prepares third and rammed all over light after the completion of precompressed precipitation；

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 gradually water conservation and removes part manifold at tamping point and prepares full ram after the completion of water for prepressing precipitation；

Step 12: remaining manifold, well-point pipe are pulled out, and it is full to ram, stop 7 days after light ram in third and carry out, energy level 1000kN.m is bulldozed after rammer；

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 averaged 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 the degree of consolidation 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 5.5 ~ 9MPa of compression modulus is calculated into crust layer static sounding, and the 2nd layer of Muddy Bottoms clay mechanics index of physics is obviously improved.

Claims

1. a kind of well point plastic strip vacuum preloading seepage consolidation combines precipitating, pre-pressing dynamic consolidation method, it is characterised in that it includes following Step：

First, levelling of the land, area sewerage to be reinforced；

Then, select without or carry out the pre- rammer before precipitation；

Then, plastic strip vacuum system in integral type well point is arranged

Integral type well point plastic strip pipe, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice；

Integral type well point plastic strip pipe includes drain bar, connection box, well-point pipe and connecting tube, the drain bar and is vertically arranged in depth In layer soil body, the well-point pipe is vertically arranged in shallow soil body, and the upper end of drain bar is by connecting the lower end of box and well-point pipe Connection, the upper end exposing shallow soil of well-point pipe is external, and the upper end of well-point pipe and one end of connecting tube connect；

Integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system,

Then, vacuum preloading

It treats the cofferdam fill of reinforcing area surrounding, takes out reinforcing area outside source water in advance to treating in reinforcing area cofferdam, then Integral type well point plastic strip vacuum system starts vacuum preloading, and suction underground water whole recharge is to treating reinforcing area table during vacuum preloading Face, region surface to be reinforced all are annihilated by water to certain altitude, are realized water covering prepressing, are covered water-stop, cover water seepage flow；

Then, vacuum dewatering preloading

It is carried out in the fill of cofferdam in the water to gutter stored in opening aerial drainage cofferdam fill, starts multipass vacuum dewatering preloading, Primary light rammer between adjacent vacuum dewatering preloading is twice set, full rammer is carried out after last time vacuum dewatering preloading；

Finally, the absolute altitude of vibroroller cmpacting measurement in the whole field is handed over.

2. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 1, It is vacuumized it is characterized in that vacuum pump is vacuumized using hierarchical loading.

3. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 2, It is characterized in that vacuum pump hierarchical loading vacuum step is as follows：The vacuum pump hierarchical loading first order takes every vacuum pump process face 1800 ~ 2000 squares of product, manifold first sections negative pressure are full table 100kPa, and total pipe end is not less than 90kPa, treat that sedimentation meets continuous 3 No more than 3 millimeters, the vacuum pump hierarchical loading second level takes every 1300 ~ 1500 squares of vacuum pump processing area, waits to sink for its sedimentation Drop meets sedimentation for three days on end, and, no more than 3 millimeters, the vacuum pump hierarchical loading third level takes every vacuum pump processing area 800 ~ 1000 Square or hereinafter, and so on, treat that sedimentation meets sedimentation in continuous 5 days no more than 2 millimeters, reach vacuum preloading processing requirement.

4. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 1, It is characterized in that drain bar includes internal core plate and the filter membrane of core plate periphery, draining is formed between the core plate and filter membrane and is led to Road, the core plate are made of non-degradable material or material difficult to degrade, and the filter membrane is made of degradation material.

5. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 4, It is characterized in that core plate includes the main gusset and the more longitudinally spaced secondary muscle being arranged in before and after main gusset of a lateral arrangement Plate, the gap formed between main ribs plate, secondary gusset and filter membrane is drainage channel.

6. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 1, It is characterized in that the connecting tube is wired hose, connecting tube includes hose and the spiral wire of Lining Hose.

7. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 1, It is characterized in that manifold includes transverse tube, the transverse tube is segmented by multiple transverse tubes and mostly logical linkage section is formed by connecting, two neighboring It is attached between transverse tube segmentation by mostly logical linkage section.

8. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 7, It is characterized in that mostly logical linkage section, using eight logical linkage sections, eight logical linkage sections include linkage section main body, the left and right of linkage section main body Both ends are respectively arranged with transverse tube segmentation interface, and three connection interface tubes are forwardly and rearwardly respectively arranged in linkage section main body, The adjacent connecting tube of connection interface tube is attached, the adjacent transverse tube segmentation connection of transverse tube segmentation interface.

9. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 7, It is characterized in that transverse tube segmentation includes a necking section and straight pipe, the necking section that same transverse tube is segmented to longitudinal tubule (L tubule) away from From the distance than straight pipe to longitudinal tubule (L tubule).

10. a kind of well point plastic strip vacuum preloading seepage consolidation joint precipitating, pre-pressing dynamic consolidation method according to claim 1, It is characterized in that manifold includes longitudinal tubule (L tubule), the longitudinal tubule (L tubule) is segmented by multiple longitudinal tubule (L tubule)s and three-way connection is formed by connecting, two neighboring vertical Pipe segmentation is connected by three-way connection, and the third interface of three-way connection connects the transverse tube closed on, is additionally provided in longitudinal tubule (L tubule) segmentation Check valve.