CN105887902B - Well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method - Google Patents
Well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method Download PDFInfo
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- CN105887902B CN105887902B CN201610379609.3A CN201610379609A CN105887902B CN 105887902 B CN105887902 B CN 105887902B CN 201610379609 A CN201610379609 A CN 201610379609A CN 105887902 B CN105887902 B CN 105887902B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
Abstract
A kind of well point plastic strip 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, 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, wait for the cofferdam fill of reinforcing area surrounding, reinforcing area outside source water is taken out in advance to waiting in reinforcing area cofferdam, then start vacuum preloading, then start multipass vacuum dewatering preloading, primary light rammer is set between adjacent vacuum dewatering preloading twice, 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.The present invention has the advantages that easy to operate, of low cost, construction effect is good.
Description
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 pre-pressed joint precipitation are pre-
Pressure power concretion 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 constituted.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：
One, 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 has the following disadvantages：
1, 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；
2, 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；
3, a large amount of pvc diaphragm seals are not environmentally；
4, for earth's surface maximum up to negative pressure 80kPa, negative pressure is fast toward soil layer deep slippages under film, general to be transmitted often toward deep
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；
5, 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.
Two, follow-on vacuum pre-press reinforcing has the following disadvantages：
1, sand bedding course is gone to be changed to the direct-connected plastic strip plate mode of hand-type connector, it is directly to transmit negative pressure mould to change indirect transfer negative pressure
Formula, but its there is still a need for diaphragm seals, peak suction loading surface is still in earth's surface；
2, 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；
3, reclaim fields from the sea ultra-soft soil can not mechanical execution, first do artificial plate shallow-layer plastic strip vacuum preloading, wait for 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 complex, 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.
Three, vacuum-dewatering joint dynamic consolidation construction has the following disadvantages：
1, 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；
2, 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；
Dewatering dynamic compaction Ground Treatment because precipitation is thick layouting of dredging in short term（30 days or so）Processing mode is suitable only for shallow-layer
Processing；
The presence of above all methods can improve and optimize place.
Invention content
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of wells easy to operate, of low cost, construction effect is good
Point plastic strip 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：
1, 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；
2, Vacuum Loading System improves one：
Conventional vacuum precompressed, the load of 80KPa negative pressure of vacuum is each provided at earth's surface, and after improvement, 80KPa negative pressure maximum values are located at ground
The following shallow-layer soil body of table and deep soil junction, are improved centainly by improving vacuum preloading effective reinforcement depth theoretically
Depth（The depth of first of sealant i.e. the shallow-layer soil body）, while reducing and waiting for reinforcing area surrounding shallow-layer sealing effect not
The good negative effect brought；
3, Vacuum Loading System improves two：
Conventional vacuum precompressed use etc. carries compression system, in addition to early period is formed to check leaking source and slow down plastic strip earth pillar
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 recycles successively until stablizing, and steps up zone negative pressure to be reinforced to maximum value, is 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 80kPa or more 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 different depth soil body reaches the fully loaded negative pressure reinforcing state of theoretical limit 80kPa or more.This improvement greatly improves
Vacuum preloading limit consolidation effect, and conventional vacuum precompressed is difficult to infinitely improve vacuum pump quantity realization hierarchical loading,
The reason is that：First, the more difficult random increase vacuum pump quantity of sealing system membrane system complex, can only once be laid by preset quantity
Complete, vacuum pump quantity can not be adjusted according to monitoring data and realize dynamic load, secondly, be continuously increased with vacuum pump quantity,
Level of ground water decline is too fast, and the above surrounding soil body of level of ground water forms larger leaking source, conventional to use clay envelope wall cement
Native envelope wall etc. seems helpless less effective that process materials limit at present in face of the huge leaking source of semi-infinite body ground
The slow gas leakage that earth's surface sealing system shows under ever-increasing vacuum level, causes to form the cycle of a limiting equilibrium,
Therefore the vacuum pump quantity balanced there are one conventional vacuum precompressed, the every vacuum pump processing area 800 ~ 1500 also often said in specification
Square.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；
4, 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, be convenient for maintaining, extend service life of equipment, while being easy to implement vacuum preloading and precipitation is strong
The perfect linking for ramming construction completes " vacuum 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.
5, the improvement of manifold：
Conventional vacuum precompressed manifold is equal diameter pvc pipes or galvanized pipe etc., improves transverse tube and is penetrated using with self-control venturi
The transverse tube segmentation for flowing the necking section of effect improves vacuumizing effect, and in addition substituting traditional threeway using mostly logical linkage section improves tubing
Utilization rate and efficiency of assembling；
6, 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；
7, 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 under earth's surface in shallow soil body under noresidue drainage channel, the shallow-layer soil body realizes whole work
Drainage channel is not stayed afterwards, reduces residual settlement after work；
8, conventional precipitation gently rams well point mechanical hole building and does not often take out water formation dried-up well, general to recommend to rush using artificial water
Method pore-forming, the general 200 ~ 300mm in aperture, general 1 meter or so of filter, pore-forming is bad can not to be often discharged, and spacing of layouting is due to shining
It cares for and rams walking and be also impossible to too close, the limited water lift of light well point vacuum-dewatering principle is height-limited, seen in document most at present
Deep light well point considers precipitation funnel also just at 7 meters or so, therefore level of ground water reduces only 4 ~ 5 meters or so of limit depth,
Being required to backfill medium coarse sand ensures water recharging, and water yield is smaller, causes vacuum jet pump negative pressure to reduce the very fast vacuum that influences and drops
Water effect, but this causes that there are sand drains to continue the unfavorable factors such as drainage subsidence after gas leakage negative pressure in well point is not high and work simultaneously, thus it is existing
Deep-well precipitation or tube well dewatering are used in follow-on Dewatering dynamic compaction prevalence, but layouting in view of two kinds of dewatering modes can not possibly 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 precipitation is not only improved,
Be conducive to vacuum preloading again, realize that mechanized construction pore-forming efficiency is high, since filter uses 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；
9, conventional vacuum precompressed plastic draining board top is located at ground surface, and light ram can cause place large area to be discharged, 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；
10, 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 that the purpose of a material multipurpose efficiency energy saving is realized in vacuum seepage precompressed, a kind of 2 kinds of effects of material；
11, 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, work China Democratic National Construction Association workshop storage ground and airfield runway, town road and iron are particularly suitable for
Road roadbed etc.；
12, 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 realizes the shallow-layer precipitation vacuum preloading preferably sealed.
Therefore the present invention has the advantages that easy to operate, of low cost, construction effect is good.
Description of the drawings
Fig. 1 is the elevational schematic view of the integral type well point plastic strip vacuum system of the present invention.
Fig. 2 is the schematic top plan view of the integral type well point plastic strip vacuum system of the present invention.
Fig. 3 is the structural schematic diagram of the integral type well point plastic strip pipe of the present invention.
Fig. 4 is the sectional view of the drain bar of the present invention.
Fig. 5 is the structural schematic diagram of the connection box of the present invention.
Fig. 6 is enlarged drawing at the A in Fig. 2.
Fig. 7 is the schematic diagram of the transverse tube in Fig. 6.
Fig. 8 is enlarged drawing at the B in Fig. 2.
Fig. 9 is the construction method schematic diagram of the embodiment of the present invention one.
Wherein：
Drain bar 1, core plate 1.1, main gusset 1.11, secondary gusset 1.12, filter membrane 1.2, drainage channel 1.3
Connect box 2, shell 2.1, lower interface 2.2, upper interface 2.3, screw hole 2.4
Well-point pipe 3
Connecting tube 4
Transverse tube 5, transverse tube segmentation 5.1, straight pipe 5.11, the first Taper Pipe section 5.12, the second Taper Pipe section 5.13, mostly logical linkage section
5.2, linkage section main body 5.21, transverse tube segmentation interface 5.22, connection interface tube 5.23
Longitudinal tubule (L tubule) 6, longitudinal tubule (L tubule) segmentation 6.1, three-way connection 6.2, check valve 6.3
Vacuum pump 7
Water-stop curtain 8
Deep soil 100
The shallow-layer soil body 200.
Specific implementation mode
Referring to Fig. 1 ~ Fig. 9, a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method of the present invention, it
Include the following steps：
Step 1: levelling of the land, waits for that reinforcing area surrounding excavates draining ditch water discharge；
Step 2: the pre- rammer before precipitation is selected without or carried out according to soil condition, energy level tentative 600 ~
1000kN.m, square tamping point spacing 4*4 ~ 7*7m are adjustable, are 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
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice；
1 ~ 4m of grid spacing of integral type well point plastic strip pipe network lattice is adjustable；
Integral type well point plastic strip pipe（Namely improved branch pipe）Including drain bar 1, connection box 2, well-point pipe 3 and connect
Take over 4, the drain bar 1 are vertically arranged in deep soil 100, and the length of drain bar 1 is 20m or so, and the well-point pipe 3 is perpendicular
To being arranged in the shallow-layer soil body 200, the length of well-point pipe 3 is 6 ~ 9m, and the upper end of drain bar 1 is by connecting box 2 and well-point pipe 3
Lower end connects, and the upper end of well-point pipe 3 is exposed outside the shallow-layer soil body 200, and the upper end of well-point pipe 3 is connect with one end of connecting tube 4, connection
The length of pipe 4 is 1 ~ 2m.A diameter of 10 ~ 20mm of well-point pipe 3 and connecting tube 4.
Drain bar 1 includes the filter membrane 1.2 of internal 1.1 periphery of core plate 1.1 and core plate, the core plate 1.1 and filter membrane 1.2
Between form drainage channel 1.3, the core plate 1.1 is made of non-degradable material or material difficult to degrade, and the filter membrane 1.2 is
Degradation material is made.
As a preferred embodiment, core plate 1.1 is made of plastic material, filter membrane 1.2 is made of flax material.
As a preferred embodiment, core plate 1.1 includes the main gusset 1.11 and more longitudinally spaced arrangements of a lateral arrangement
Secondary gusset 1.12 before and after main gusset 1.11, the sky formed between main ribs plate 1.11, secondary gusset 1.12 and filter membrane 1.2
Gap is drainage channel 1.3.
After drain bar 1 is inserted into ground, as time goes by, since filter membrane 1.2 is made of degradation material, filter membrane
1.2 realize after fast degradations, filter membrane 1.2 are degraded that the only remaining core plate 1.1 in ground, the soil in ground can fill former filter membrane
1.2 and former drainage channel 1.3 space so that soil is fitted closely with core plate 1.1, thus core plate 1.1 in ground not only
There is no gap so that ground continues to settle, and the effect of reinforcement is also acted, improves difference floor heights above and below in ground
Integraty.
The lower end of the drain bar 1 is provided with bottom discharge plate end socket, and bottom discharge plate end socket uses plastic adhesive tape paper bag
It wraps up in be formed.
The connection box 2 includes shell 2.1, and there are one kissed with 1 upper end shape of drain bar for the lower end setting of the shell 2.1
The lower interface 2.2 of conjunction, there are one the upper interface 2.3 coincideing with 3 lower end shape of well-point pipe, institutes for the upper end setting of the connection box 2
Setting is stated on shell 2.1 there are three screw hole 2.4, the rectangular in cross-section structure of the lower interface 2.2, drain bar 1 when installation
Upper end is inserted at lower interface 2.2, and then drain bar 1 and connection box 2 are connected in one by drivescrew in screw hole 2.4, so
Afterwards plastic adhesive tape is dressed outside in lower interface 2.2.The upper interface 2.3 is circular tube structure, and the lower end of well-point pipe 3 is sheathed on when installation
Outside upper interface 2.3, the lower end of upper interface 2.3 and well-point pipe 3 is then dressed outside into plastic adhesive tape.
The connecting tube 4 is wired hose, and connecting tube 4 includes hose and the spiral wire of Lining Hose.
The well-point pipe 3 is the plastic tubes such as PPR, and well-point pipe 3 is wrapped up by diaphragm seal with 4 junction of connecting tube or steel wire
Winding is generated negative-pressure dense sealer after being wrapped up using diaphragm seal, when plastic strip pipe vacuumizes in integral type well point and the more is inhaled the more tight.Well point
Pipe 3 can also use same wired hose with connecting tube 4 so that well-point pipe 3 forms integral structure with connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system.
The manifold includes longitudinal tubule (L tubule) 6 and more transverse tubes 5 being connected on longitudinal tubule (L tubule) 6.
By multiple transverse tubes segmentation 5.1 and mostly, logical linkage section 5.2 is formed by connecting the transverse tube 5, two neighboring transverse tube segmentation
It is attached between 5.1 by leading to linkage section 5.2, mostly logical linkage sections 5.2 are preferably logical using eight logical linkage sections, eight as one kind more
Linkage section includes linkage section main body 5.21, and the left and right ends of linkage section main body are respectively arranged with transverse tube segmentation interface 5.22, even
It connects and is forwardly and rearwardly respectively set in section main body 5.21 there are three interface tube 5.23 is connected, connection interface tube 5.23 is adjacent
Connecting tube 4 is attached, and transverse tube is segmented adjacent 5.1 connection of transverse tube segmentation of interface 5.22, and the transverse tube segmentation 5.1 includes
One necking section, necking section are arranged close to mostly logical linkage section 5.2, and the transverse tube segmentation 5.1 further includes straight pipe 5.11, the neck
Contracting section includes the first Taper Pipe section 5.12 and the second Taper Pipe section 5.13, the small head end of the first Taper Pipe section 5.12 and the second Taper Pipe section
The transverse tube of 5.13 small head end docking, stub end more logical linkage sections 5.2 adjacent thereto of the first Taper Pipe section 5.12 is segmented interface
5.22 docking, the stub end of the second Taper Pipe section 5.13 docks with one end of straight pipe 5.11, the other end of straight pipe 5.11 and its
The transverse tube segmentation interface 5.22 of adjacent how logical linkage section 5.2 docks.The taper of first Taper Pipe section 5.12 is more than the second Taper Pipe section
5.13 taper, necking section form venturi jet stream effect.
The longitudinal tubule (L tubule) 6 is vertically connected at one end of all transverse tubes 5, and the one end of transverse tube 5 far from longitudinal tubule (L tubule) 6 is provided with transverse tube envelope
Head, far from longitudinal tubule (L tubule) 6, the straight pipe 5.11 of the transverse tube segmentation 5.1 on transverse tube 5 is close for the necking section of the transverse tube segmentation 5.1 on transverse tube 5
Longitudinal tubule (L tubule) 6.A piece longitudinal tubule (L tubule) 6 connects more transverse tubes 5, the longitudinal tubule (L tubule) 6 by multiple longitudinal tubule (L tubule)s segmentation 6.1 and the connection of three-way connection 6.2 and
At two neighboring longitudinal tubule (L tubule) segmentation 6.1 is connected by three-way connection 6.2, and the third interface of three-way connection 6.2 connects the cross closed on
Pipe 5, longitudinal tubule (L tubule) are segmented on 6.1 and are additionally provided with check valve 6.3, and the end set of longitudinal tubule (L tubule) 6 has longitudinal tubule (L tubule) end socket.
Step 4: vacuum preloading
Integral type well point plastic strip vacuum system starts vacuum preloading, and intermediate pump 7 is preferably sealed vacuum jet pump,
Vacuum pump is vacuumized to be vacuumized using hierarchical loading：The vacuum pump hierarchical loading first order take every vacuum pump processing area 1800 ~
2000 squares adjustable, and manifold first section negative pressure is full table 100kPa, and total pipe end is not less than 90kPa, waits for that sedimentation meets and sinks for three days on end
Drop is not more than 3 millimeters, and the vacuum pump hierarchical loading second level takes every 1300 ~ 1500 squares of vacuum pump processing area adjustable, waits sinking
Drop meets sedimentation for three days on end and is not more than 3 millimeters, and the vacuum pump hierarchical loading third level takes every vacuum pump processing area 800 ~ 1000
Square or less it is adjustable, and so on, wait for sedimentation meet continuous 5 days sedimentation be not more than 2 millimeters, reach vacuum preloading processing want
It asks；
Step 5: starting first pass vacuum dewatering preloading, 5 ~ 10 days adjustable, for the purpose of lowering of watertable, waits for underground
Water level 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 is adjustable,
Side is removed total tube edge and is gently rammed, gradually forward impelling, and light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and rams pusher
It is flat；
Step 7: integral type well point plastic strip pipe Mesh connection residue manifold and vacuum pump, it is pre- to start second time vacuum-dewatering
Pressure, 5 ~ 10 days adjustable, is gradually retained after the completion of second time vacuum dewatering preloading precipitation and removes manifold preparations in part at tamping point
It is second time light to ram；
Step 8: second time light ram, 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, which is gradually retained after the completion of vacuum dewatering preloading precipitation and removes part manifold at tamping point, to be prepared
It is full to ram；
Step 10: remaining manifold is pulled out, when the well-point pipe 3 and connecting tube 4 used is split structure, by well-point pipe 3
It is all pulled out with connecting tube 4, when the wired hose that the well-point pipe 3 and connecting tube 4 that use are an integral structure, excision ground
Then connecting tube 4 more than table is in the milk in the well-point pipe 3 under earth's surface.It is full to ram, at least stop 7 after second time light ram
It is carried out, 600 ~ 1000kN.m of energy level, is bulldozed after rammer；
Step 11: the absolute altitude of vibroroller cmpacting measurement in the whole field is handed over.
Note：Integral type well point plastic strip vacuum system can be pre- according to place and soil property situation adjustment spacing and length, vacuum
Pressure, precipitation and it is light ram can according to place and soil property situation set-up procedure and pass and duration, ordinary circumstance descending water 3 ~ 4 times,
It is light to ram 3 ~ 5 times.Construction period construction monitoring must synchronize progress, it is necessary to which the monitoring project of progress has：Pore water pressure,
Level of ground water, ground settlement, delaminating deposition, vacuum degree realize information-aided construction.
Three groups of embodiments are supplemented below：
Embodiment one,
Essential information before basement process：
The ground third layer Muddy Bottoms clay layer water content 55%, compression modulus 2.3MPa, thickness is 15 meters average, and layer top is buried
Deep 5m, 20 meters of layer bottom buried depth.
Implementation steps：
Step 1: levelling of the land, waits for that reinforcing area surrounding excavates draining ditch water discharge；
Step 2: pre- ram, energy level 800kN.m, square tamping point spacing 4m*4m, construction cement mixing pile is laterally close after rammer
Block wall or mud lateral seal barricade；
Step 3: integral type well point plastic strip vacuum system is arranged
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice；
The grid spacing 1.2m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plug depth 20m
The length of drain bar 1 is 14m, and the length of well-point pipe 3 is 6m, and the length of connecting tube 4 is 10cm.Well-point pipe 3 and
The diameter 16mm of connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system,
Step 4: vacuum preloading
Start vacuum preloading seepage consolidation；
Its intermediate pump 7 is preferably sealed vacuum jet pump, and vacuum pump is vacuumized to be vacuumized using hierarchical loading：Vacuum
It is full table 100kPa, Zong Guanmo that the pump hierarchical loading first order, which takes every 1800 squares of vacuum pump processing area, manifold first section negative pressure,
End is not less than 90kPa, and processing waits for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 13 days, the vacuum pump hierarchical loading second level
Every 1300 squares of vacuum pump processing area, processing is taken to wait for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 8 days, vacuum pump
The hierarchical loading third level takes every 800 squares of vacuum pump processing area, and processing waits for that sedimentation meets sedimentation for three days on end after 8 days little
In 3 millimeters, the vacuum pump hierarchical loading fourth stage takes every 600 squares of vacuum pump processing area, and sedimentation, which meets, after processing 15 days connects
Sedimentation in continuous 5 days is not more than 2 millimeters, reaches vacuum preloading processing requirement；
Step 5: starting first pass vacuum dewatering preloading, 6 days, for the purpose of lowering of watertable, wait for that level of ground water reaches
4m gradually removes manifold preparations first pass at tamping point and 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 is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare second time light ram；
Step 8: second time light ram, energy level fixes tentatively 2000kN.m, square tamping point spacing 4m*4m；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 is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare full ram；
Step 10: remaining manifold is pulled out, and it is full to ram, stop 7 days after second time light ram and carry out, energy level 800kN.m rams pusher
It is flat；
Step 11: vibroroller cmpacting is handed in the whole field.
Construction monitoring during the Foundation Treatment, negative pressure 80kPa at 6 meters of pore water pressure, negative pressure is average at 20 meters
30kPa, it is 8 meters that level of ground water, which declines maximum value, and it is 80cm fifty-fifty to descend 6 meters or so of water level decreasing, earth's surface average settlement amount, is pushed away
It calculates the degree of consolidation and is not less than 80%,
Foundation detection, foundation bearing capacity are not less than 120kPa, and effective reinforcement depth is not less than 20 meters, is formed in 5 meters of shallow-layer
Crust layer static sounding calculates that 5 ~ 8MPa of compression modulus, third layer Muddy Bottoms clay mechanics index of physics are obviously improved.
Embodiment two,
Essential information before basement process
The ground the 4th layer of Muddy Bottoms silty clay layer water content 38%, compression modulus 3.8MPa, thickness is 13 meters average, and layer top is buried
Deep 3m, 16 meters of layer bottom buried depth.
Step 1: levelling of the land, waits for that reinforcing area surrounding excavates draining ditch water discharge；
Step 2: without the pre- rammer before precipitation, construct cement mixing pile lateral seal barricade or mud lateral seal gear
Wall；
Step 3: integral type well point plastic strip vacuum system is arranged
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice；
The grid spacing 1.5m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plug depth 16m
The length of drain bar 1 is 10m, and the length of well-point pipe 3 is 6m, and the length of connecting tube 4 is 10cm.Well-point pipe 3 and
The diameter 20mm of connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system,
Step 4: vacuum preloading
Start vacuum preloading seepage consolidation；
Its intermediate pump 7 is preferably sealed vacuum jet pump, and vacuum pump is vacuumized to be vacuumized using hierarchical loading：Vacuum
It is full table 100kPa, Zong Guanmo that the pump hierarchical loading first order, which takes every 2000 squares of vacuum pump processing area, manifold first section negative pressure,
End is not less than 90kPa, and processing waits for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 10 days, the vacuum pump hierarchical loading second level
Every 1500 squares of vacuum pump processing area, processing is taken to wait for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 7 days, vacuum pump
The hierarchical loading third level takes every 800 squares of vacuum pump processing area, and processing, which settled to meet to settle for continuous 5 days after 15 days, to be not more than
2 millimeters, reach vacuum preloading processing requirement；
Step 5: starting first pass vacuum dewatering preloading, 7 days, for the purpose of lowering of watertable, wait for that level of ground water reaches
5m gradually removes manifold preparations first pass at tamping point and 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 is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare second time light ram；
Step 8: second time light ram, energy level fixes tentatively 2500kN.m, square tamping point spacing 4m*4m；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 is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare full ram；
Step 10: pulling out remaining manifold, full rammer stops 7 days after second time light ram and carries out, energy level 1000kN.m, after rammer
It is bulldozed；
Step 11: vibroroller cmpacting is handed in the whole field.
Construction monitoring during the Foundation Treatment, negative pressure 86kPa at 6 meters of pore water pressure, negative pressure is average at 16 meters
45kPa, it is 8 meters that level of ground water, which declines maximum value, and it is 58cm fifty-fifty to descend 6 meters or so of water level decreasing, earth's surface average settlement amount, is pushed away
It calculates the degree of consolidation and is not less than 80%,
Foundation detection, foundation bearing capacity are not less than 120kPa, and effective reinforcement depth is not less than 16 meters, is formed in 6 meters of shallow-layer
Crust layer static sounding calculates that 8 ~ 13MPa of compression modulus, the 4th layer of Muddy Bottoms silty clay mechanics index of physics are obviously improved.
Embodiment three,
Essential information before basement process
The 2nd layer of Muddy Bottoms clay water content 78% of the ground, compression modulus 2.1MPa, thickness is 20 meters, layer top buried depth 4m average,
24 meters of layer bottom buried depth.
Step 1: levelling of the land, stabilization zone surrounding excavates draining ditch water discharge；
Step 2: the pre- rammer before precipitation, energy level 600kN.m, square tamping point spacing 4m*7m, cement mixing of constructing after rammer
Stake lateral seal barricade or mud lateral seal barricade；
Step 3: integral type well point plastic strip vacuum system is arranged
3.1, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice；
The grid spacing 1.0m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plug depth 24m
The length of drain bar 1 is 18.5m, and the length of well-point pipe 3 is 5.5m, and the length of connecting tube 4 is 10cm.Well-point pipe 3
And the diameter 16mm of connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system,
Step 4: vacuum preloading
Start vacuum preloading seepage consolidation；
Its intermediate pump 7 is preferably sealed vacuum jet pump, and vacuum pump is vacuumized to be vacuumized using hierarchical loading：Vacuum
It is full table 100kPa, Zong Guanmo that the pump hierarchical loading first order, which takes every 1800 squares of vacuum pump processing area, manifold first section negative pressure,
End is not less than 90kPa, and processing waits for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 25 days, the vacuum pump hierarchical loading second level
Every 1300 squares of vacuum pump processing area, processing is taken to wait for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 12 days, vacuum
The pump hierarchical loading third level takes every 800 squares of vacuum pump processing area, processing to wait for that sedimentation meets after 12 days and settle for three days on end not
More than 3 millimeters, the vacuum pump hierarchical loading fourth stage takes every 600 squares of vacuum pump processing area, and processing settles after 26 days to be met
Sedimentation in continuous 5 days is not more than 2 millimeters, reaches vacuum preloading processing requirement；
Step 5: starting first pass vacuum dewatering preloading, 10 days, for the purpose of lowering of watertable, wait for that level of ground water reaches
To 4.5m, gradually removes manifold preparations first pass at tamping point and gently ram；
Step 6: first pass gently rams, energy level fixes tentatively 1800kN.m, square tamping point spacing 4m*7m, is bulldozed after rammer；
Step 7: connection residue manifold and vacuum pump, second time vacuum dewatering preloading of beginning, 5 days, second time vacuum-dewatering
It is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare second time light ram；
Step 8: second time light ram, energy level fixes tentatively 2300kN.m, square tamping point spacing 4m*7m；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 is gradually retained after the completion of precompressed precipitation and removes part manifold at tamping point and prepare third all over light rammer；
Step 10: third is rammed all over light, energy level 2800kN.m, square tamping point spacing 4m*7m；Side is removed total tube edge and is gently rammed,
Gradually forward impelling, light rammer front region, which need to continue precipitation, ensures that level of ground water is not gone up, and is bulldozed after rammer；
Step 11: connection residue manifold and vacuum pump, the vacuum dewatering preloading 10 days of beginning the 4th time, the 4th time vacuum drop
It is gradually retained after the completion of water for prepressing precipitation and removes part manifold at tamping point and prepare full ram；
Step 12: remaining manifold is pulled out, and it is full to ram, stop 7 days after light ram in third and carry out, energy level 1000kN.m is rammed
After be bulldozed；
Step 13: vibroroller cmpacting is handed in the whole field.
Construction monitoring during the Foundation Treatment, negative pressure 83kPa at 6 meters of pore water pressure, negative pressure is average at 15 meters
40kPa, negative pressure 20kPa at 24 meters, it is 6.5 meters that level of ground water, which declines maximum value, fifty-fifty descends 5 meters or so of water level decreasing, earth's surface
Average settlement amount is 118cm, calculates that the degree of consolidation is not less than 80%,
Foundation detection, foundation bearing capacity are not less than 120kPa, and effective reinforcement depth is not less than 24 meters, shape in 5.5 meters of shallow-layer
Calculate that 5.5 ~ 9MPa of compression modulus, the 2nd layer of Muddy Bottoms clay mechanics index of physics are obviously improved at crust layer static sounding.
Claims (8)
1. a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, 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：
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 that drain bar, connection box, well-point pipe and connecting tube, the drain bar are 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 passes through the lower end for connecting box and well-point pipe
The upper end exposing shallow soil of connection, 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,
Vacuum pump is vacuumized to be vacuumized using hierarchical loading：The vacuum pump hierarchical loading first order takes every vacuum pump processing area
1800 squares, processing waits for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 25 days, the vacuum pump hierarchical loading second level takes often
1300 squares of platform vacuum pump processing area, processing wait for that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters after 12 days, vacuum pump point
The grade load third level takes every 800 squares of vacuum pump processing area, processing to wait for that sedimentation meets sedimentation for three days on end and is not more than after 12 days
3 millimeters, the vacuum pump hierarchical loading fourth stage takes every 600 squares of vacuum pump processing area, and processing settles after 26 days meets continuous 5
Its sedimentation is not more than 2 millimeters, reaches vacuum preloading processing requirement；
Then, start multipass vacuum dewatering preloading, primary light rammer is set between adjacent vacuum dewatering preloading twice, last time is true
Full rammer is carried out after airborne water for prepressing；
Finally, the absolute altitude of vibroroller cmpacting measurement in the whole field is handed over.
2. a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, feature exist
Include the filter membrane of internal core plate and core plate periphery in drain bar, forms drainage channel between the core plate and filter membrane, it is described
Core plate is made of non-degradable material or material difficult to degrade, and the filter membrane is made of degradation material.
3. a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 2, feature exist
In core plate include lateral arrangement main gusset and more it is longitudinally spaced be arranged in main gusset before and after secondary gusset, the master
The gap formed between gusset, secondary gusset and filter membrane is drainage channel.
4. a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, feature exist
It is wired hose in the connecting tube, connecting tube includes hose and the spiral wire of Lining Hose.
5. a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, feature exist
Yu manifold includes transverse tube, and the transverse tube is segmented by multiple transverse tubes and mostly logical linkage section is formed by connecting, two neighboring transverse tube segmentation
Between be attached by mostly logical linkage section.
6. a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 5, feature exist
It includes linkage section main body, the left and right ends difference of linkage section main body to use eight logical linkage sections, eight logical linkage sections in more logical linkage sections
It is provided with transverse tube segmentation interface, is forwardly and rearwardly respectively set in linkage section main body there are three interface tube is connected, connecting tube connects
The adjacent connecting tube of mouth is attached, and transverse tube is segmented the adjacent transverse tube segmentation connection of interface.
7. a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 5, feature exist
Include a necking section and straight pipe in transverse tube segmentation, the distance of necking section to the longitudinal tubule (L tubule) of the same transverse tube segmentation compares straight tube
Section to longitudinal tubule (L tubule) distance.
8. a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method according to claim 1, feature exist
Yu manifold includes longitudinal tubule (L tubule), and 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 is logical
Three-way connection connection is crossed, the third interface of three-way connection connects the transverse tube closed on, check valve is additionally provided in longitudinal tubule (L tubule) segmentation.
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| CN101614006A (en) * | 2009-07-09 | 2009-12-30 | 宜兴市鑫泰土工材料有限公司 | Silt consolidation is with band drain and filter cloth and band drain core |
| CN101906772A (en) * | 2010-07-26 | 2010-12-08 | 李燕青 | Fast consolidation method of blow-filled soft soil for land reclamation |
| CN102561308A (en) * | 2012-01-19 | 2012-07-11 | 叶凝雯 | Light-well plastic-strip superposition vacuum preloading method for soft soil foundation |
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