CN105970910B

CN105970910B - Well point plastic strip overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method

Info

Publication number: CN105970910B
Application number: CN201610379647.9A
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: 2018-06-19
Anticipated expiration: 2036-06-01
Also published as: CN105970910A

Abstract

A kind of well point plastic strip overlay film vacuum pre-pressed 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；Then, the pre- rammer before precipitation is selected without or carried out, water-stop curtain is set；Then, plastic strip vacuum system in integral type well point is arranged, the total pipe surface earthing work cloth and diaphragm seal of plastic strip vacuum system in integral type well point；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, carries 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 overlay film vacuum pre-pressed 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 overlay film vacuum pre-pressed joint to drop Water for prepressing 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 Difficulty, sealing effect are bad；

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 overlay film vacuum pre-pressed 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 sand bedding course, by the way that the shallow-layer soil body at the well-point pipe of integral type well point plastic strip vacuum system is used as under overlay film First of critical seal layer；Sealing effect is good, and construction is simple is reliable, saves material；

2nd, sealing system improves two：

Setting identical with conventional vacuum precompressed sealing system, diaphragm seal containing geotextiles and mud sealing curtain；

3rd, sealing system improves three：

Region surface to be reinforced in cofferdam covers water-stop, forms the third road sealant under overlay film；

4th, sealing system improves four

Diaphragm seal indentation sealing postsulcal part point is backfilling and compacted, and sealing ditch, which is poured water, to be ensured to seal ditch leakproofness, forms the 4th Sealing；

5th, 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；

6th, 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.

7th, 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.

8th, the improvement of manifold：

Conventional vacuum precompressed manifold is equal diameter pvc chimney filters etc., improves transverse tube and uses with self-control venturi jet stream effect The transverse tube segmentation of necking section improve vacuumizing effect, in addition substituting traditional threeways using mostly logical linkage sections improves tubing utilization rates And efficiency of assembling；

9th, 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；

10th, the remaining plastic draining board of conventional vacuum precompressed often causes certain residual settlement after work, especially constructs Period fails the soft soil foundation fully consolidated, the slow consolidation settlement under load long term after work, forms disease, after improvement, The superstructure of integral type well point plastic strip pipe（Connect box, well-point pipe and connecting tube）It can pull out, it is light in vacuum preloading, precipitation After the completion of rammer, the superstructure of integral type well point plastic strip pipe, the superstructure of integral type well point plastic strip pipe are pulled out using pipe extractor It can reuse, while the drain bar under earth's surface in shallow soil body under noresidue drainage channel, the shallow-layer soil body realizes entirety Drainage channel is not stayed after work, reduces residual settlement after work；

11st, 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, but this cause that gas leakage negative pressure in well point is not high simultaneously and work after there are sand drains to continue the unfavorable factors such as drainage subsidence, therefore Present follow-on Dewatering dynamic compaction prevalence is using deep-well precipitation or tube well dewatering, but in view of two kinds of dewatering modes are layouted it is not possible that too It is close, precipitation can only be played the role of, it is difficult to play vacuum preloading, integral type well point plastic strip vacuum system, filter depth can be with Than vacuum-dewatering well point depth, gravity precipitation and vacuum-dewatering are taken into account, cheap suitable large area is laid, and not only improves precipitation, Be conducive to vacuum preloading again, realize that mechanized construction pore-forming efficiency is high, since filter is using the higher overlength plastic row of water-flowing amount Water plate, dried-up well rate is almost nil, and either precipitation depth is also or precipitation efficiency perfect can substitute above-mentioned various drops completely Water gently rams mode；

12nd, 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 branch pipe is extracted, and area peripheral edge is rammed close to light Connection manifold, which continues to draw water, keeps level of ground water, therefore even if gently being rammed in the point, and underground flood peak, which is also impossible to break through the shallow-layer soil body, to be oozed It flow to earth surface effects gently to ram, it is ensured that light rammer construction drying is anhydrous；

13rd, vacuum pre-press reinforcing deep foundation base is used early period, but must the unlikely too fast influence vacuum of decline of controlling groundwater level Pre-compressed effect, under normal circumstances level of ground water decline should be controlled within 2 ~ 3 meters of underground.It treats vacuum preloading settlement stability, opens The water that cofferdam aerial drainage stores（Conventional depth of water 50cm or so）, diaphragm seal is removed, continues quick lowering of watertable and play to take into account drop While the vacuum preloading of water for prepressing effect, the first pass dewatering construction of Dewatering dynamic compaction is completed, quickly can reduce ground after improvement Lower water level is conventional so that strong rammer dynamic consolidation increases energy level and influence depth and ensures do not occur spongy soil simultaneously to 5 ~ 8 meters Dewatering dynamic compaction level of ground water generally only declines 2 ~ 3 meters or so, less effective.

14th, 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；

15th, 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 vacuum Precompressed, precipitating, pre-pressing, precipitation gently ram the multiple effect basement process being combined, and deep shallow layer foundation is reinforced simultaneously, is utilizing vacuum Under the premise of precompressed deep soil preferably consolidation, 6 meters or so are formed at the shallow-layer soil body using precipitating, pre-pressing and Dewatering dynamic compaction Crust layer, multiple effect increases the densification effect of the soil body, reduces settlement after construction, and the improvement is not increasing larger cost Under the premise of, multiple reinforcing task is completed, is particularly suitable for the work China Democratic National Construction Association workshop storage ground and machine stringenter to settlement request Field runway, town road and railway bed etc.；

16th, 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 Body formula well point plastic strip pipe is manually laid with diaphragm seal and realizes the vacuum preloading of four resealings and fast vacuum precipitating, pre-pressing.

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 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, 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 Drainage is lost there is no gap so that ground continues to settle, and also acts the effect of reinforcement, is improved in ground The integraty of lower difference floor height.

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.

3.3rd, 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

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；

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, geotextiles are removed Diaphragm seal starts first pass vacuum dewatering preloading, and 5 ~ 10 days adjustable, for the purpose of lowering of watertable, treats 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 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；

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, geotextiles are removed Diaphragm seal starts first pass vacuum dewatering preloading, 6 days, for the purpose of lowering of watertable, treats 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 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；

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, geotextiles are removed Diaphragm seal starts first pass vacuum dewatering preloading, 7 days, for the purpose of lowering of watertable, treats 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 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；

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, geotextiles are removed Diaphragm seal starts first pass vacuum dewatering preloading, 10 days, for the purpose of lowering of watertable, treats 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 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 overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterised in that it includes following step Suddenly：

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, and manifold includes horizontal stroke Pipe and longitudinal tubule (L tubule), the total pipe surface earthing work cloth and diaphragm seal of plastic strip vacuum system in integral type well point；

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；

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 overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, special Sign is that vacuum pump is vacuumized and is vacuumized using hierarchical loading.

3. a kind of well point plastic strip overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 2, special Sign is that vacuum pump hierarchical loading vacuum step is as follows：The vacuum pump hierarchical loading first order takes every vacuum pump processing area 1800 ~ 2000 squares, manifold first sections negative pressure is full table 100kPa, and total pipe end is not less than 90kPa, treats that sedimentation meets for three days on end No more than 3 millimeters, the vacuum pump hierarchical loading second level takes every 1300 ~ 1500 squares of vacuum pump processing area, waits to settle for sedimentation Meeting sedimentation for three days on end, no more than 3 millimeters, the vacuum pump hierarchical loading third level takes every vacuum pump processing area 800 ~ 1000 flat Side 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 overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, special Sign is that drain bar includes internal core plate and the filter membrane of core plate periphery, and drainage channel is formed between the core plate and filter membrane, The core plate is 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 overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 4, special Sign is that 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, institute It is drainage channel to state the gap formed between main gusset, secondary gusset and filter membrane.

6. a kind of well point plastic strip overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, special Sign is the connecting tube for wired hose, and connecting tube includes hose and the spiral wire of Lining Hose.

7. a kind of well point plastic strip overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, special Sign is that the transverse tube is segmented by multiple transverse tubes and mostly logical linkage section is formed by connecting, by more between two neighboring transverse tube segmentation Logical linkage section is attached.

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

9. a kind of well point plastic strip overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 7, special Sign is that the transverse tube segmentation includes a necking section and straight pipe, the distance ratio of the necking section that same transverse tube is segmented to longitudinal tubule (L tubule) Straight pipe to longitudinal tubule (L tubule) distance.

10. a kind of well point plastic strip overlay film vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, special Sign is that the longitudinal tubule (L tubule) is segmented by multiple longitudinal tubule (L tubule)s and three-way connection is formed by connecting, and two neighboring longitudinal tubule (L tubule) segmentation passes through three-way connection Connection, the third interface of three-way connection connect the transverse tube closed on, check valve are additionally provided in longitudinal tubule (L tubule) segmentation.