CN106013048B - Ultra-soft foundation vacuum preloading seepage consolidation combines precipitating, pre-pressing concretion method - Google Patents

Ultra-soft foundation vacuum preloading seepage consolidation combines precipitating, pre-pressing concretion method Download PDF

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CN106013048B
CN106013048B CN201610379607.4A CN201610379607A CN106013048B CN 106013048 B CN106013048 B CN 106013048B CN 201610379607 A CN201610379607 A CN 201610379607A CN 106013048 B CN106013048 B CN 106013048B
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vacuum
preloading
ultra
pressing
pipe
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CN106013048A (en
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张禹
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Cabr Foundation Engineering Co Ltd
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Cabr Foundation Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/0053Production methods using suction or vacuum techniques

Abstract

A kind of ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion method of the present invention, it is characterised in that it includes the following steps:A kind of ultra-soft foundation vacuum preloading seepage consolidation combines precipitating, pre-pressing concretion method, it includes the following steps:Step 1: integral type well point plastic strip vacuum system is arranged;1.1st, plastic strip pipe in integral type well point, which carries out plugging construction, forms integral type well point plastic strip pipe network lattice;1.2nd, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system;Step 2: vacuum preloading;Step 3: vacuum dewatering preloading.The present invention has the advantages that easy to operate, of low cost, construction effect is good.

Description

Ultra-soft foundation vacuum preloading seepage consolidation combines precipitating, pre-pressing concretion method
Technical field
The present invention relates to a kind of underwater processing methods more particularly to a kind of ultra-soft foundation vacuum preloading seepage consolidation to join Close precipitating, pre-pressing concretion method.
Background technology
First, conventional ultra-soft foundation, mechanical equipment can not walk and construct on it, often plug shallow-layer modeling using artificial Expect drain bar, it is artificial to be laid with sand bedding course and geotextiles diaphragm seal progress vacuum pre-press reinforcing, 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;
2nd, pvc seals the low easy damaged gas leakage of film-strength, two layers of diaphragm seal, one layer of geotextiles cost height, searches air leakage point It is difficult;
3rd, a large amount of pvc diaphragm seals are not environmentally;
4th, for earth's surface maximum up to negative pressure 80kPa, negative pressure is fast toward soil layer deep slippages, general to be transmitted often toward deep under film Rice loss negative pressure 10kPa or so, the following soft soil vacuum preloading effect of 8 to 10 meters or so of earth's surface is poor, and effective reinforcement depth is shallow;
5th, the in situ table of loading surface or backfill earth's surface, even if surface layer diaphragm seal is air tight, the stabilization zone surrounding shallow-layer soil body Slow gas leakage can not still be ignored, and in the case of especially 90 days or so long time loadings, decline in level of ground water and add to a certain extent Gu area's surrounding shallow soil body drain gas degree more causes anxiety.
2nd, follow-on vacuum pre-press reinforcing has the following disadvantages:
1st, sand bedding course is gone to be changed to the direct-connected plastic strip plate mode of hand-type connector, changes indirect transfer negative pressure directly to transmit negative pressure mould Formula, but its there is still a need for diaphragm seals, peak suction loading surface is still in earth's surface;
2nd, serous fluid of dredger fill forms sealant or the direct-connected plastic strip of vacuum manifold and buries 1.5 meters or so or 3 meters of vacuum chimney filter underground Left and right sides plastic uptake arranges replacement seal film, and 10 days vacuum preloading initial stages right-left seal is preferable, but as serous fluid of dredger fill dehydration consolidation is opened It splits, level of ground water rapid decrease, sealing effect is had a greatly reduced quality;
3rd, reclaim fields from the sea ultra-soft soil can not mechanical execution, first do artificial plate shallow-layer plastic strip vacuum preloading, treat that its ground is strong Degree is suitble to mechanical execution, then does deep vacuum precompressed, reclaim fields from the sea ultra-soft soil vacuum preloading and conventional vacuum precompressed principle technique Almost consistent, only artificial and machinery simple difference, process is more complicated, and cost is high, efficiency is low;
90 days underground water level decreasings of vacuum preloading are typically only 1 ~ 3 meter, and practical application generally handles deep soft soil foundation, shallow Layer is ineffective, theoretically reinforces groundwork bearing capacity and is generally 80kPa or so, and practical application superficial layer foundation bearing capacity is past Toward too low or even only 30 ~ 50kPa.
Invention content
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of good super of easy to operate, of low cost, construction effect Subgrade vacuum preloading seepage consolidation combines precipitating, pre-pressing concretion 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:
By regarding the shallow-layer soil body at the well-point pipe of integral type well point plastic strip vacuum system as first of sealant;It is close It is good to seal effect, construction is simple is reliable, saves material;
2nd, sealing system improves two:
Region surface water-stop to be reinforced in cofferdam forms second sealant;
3rd, Vacuum Loading System improves one:
Conventional vacuum precompressed, the loading of 80KPa negative pressure of vacuum is each provided at earth's surface, and after improvement, 80KPa negative pressure maximum value is located at ground The following shallow-layer soil body of table and deep soil junction, are improved centainly theoretically by improving vacuum preloading effective reinforcement depth Depth(The depth of first of sealant i.e. the shallow-layer soil body), while reduce and treat reinforcing area surrounding shallow-layer sealing effect not The good negative effect brought;
4th, Vacuum Loading System improves two:
Conventional vacuum precompressed using etc. carry compression system, in addition to early period in order to check leaking source and slow down plastic strip earth pillar and formed Turn on pump rate 60% ~ 80%, later stage maintain negative pressure is energy saving also turn on pump rate to be maintained to be not less than 80%, and other situations were both unchanged, improved Afterwards, using hierarchical loading, until settling stabilization under this grade of negative pressure load, level-one load level is then improved again and continues to add Pressure until stablizing, recycles successively, steps up zone negative pressure to be reinforced to maximum value, similar to static load test hierarchical loading, Also the work progress of construction multistage loadings is simulated, consolidation pattern is loaded for allergic effect power path, in practice it has proved that, conventional vacuum Although realizing earth's surface negative pressure 80kPa load levels, it is full that the following different depth soil body of earth's surface reaches far away more than 80kPa for precompressed Load state, this is a larger mistaken ideas, theoretically can be by infinitely increasing vacuum pump quantity by hierarchical loading after improvement Realize that the fully loaded negative pressure that the different depth soil body reaches more than theoretical limit 80kPa reinforces state.This improvement greatly improves Vacuum preloading limit consolidation effect, and conventional vacuum precompressed is difficult to 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 level of ground water more than surrounding soil body 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;
5th, Vacuum Loading System improves three:
Conventional vacuum covers aqueous mode in advance the double effects of sealing and water-water reactor load, but since the presence of diaphragm seal is cut off Water is covered to feed to soil mass consolidation seepage flow, it is impossible to underground water self-circulation system is formed, effect is had a greatly reduced quality, after improvement, the ground of suction Lower Water Spreading to foundation surface nature seepage flow is replenished to ground and forms cycle, and lowering of watertable vacuum seepage preloading method is not applied Work covers Water Spreading system and has avoided the occurrence of before conventional vacuum precompressed the larger effect ideal of 20 days water yields with water yield gradually The reduction of the jet stream efficiency of pump, shallow-layer sealing system are reduced in level of ground water reduction less effective, pre-compressed effect gradually reduces The problems such as, this improves most important theory and is the discovery that:1st, water as negative pressure carrier than reduce water level after soil body interstitial air Be conducive to consolidate as negative pressure carrier, it can be understood as seepage consolidation or the flow of water are poor(Negative pressure causes)Seepage consolidation, and water conduct The transmission negative pressure loss of negative pressure carrier is small, is thus extended to the simple realization of underwater vacuum precompression.2nd, precipitating, pre-pressing effect is not With obvious effects in the conventional ground theory imagination, it is pre- to deduct the increased precipitation of water buoyancy dead weight for the level of ground water more than soil body after precipitation The theoretical actual measurement performance of pressure is general, and principle is it is still necessary to further study, but more at least it may be mentioned that soil after vacuum preloading Body saturation degree has no reduction, and some are improved instead, even if assuming that soil body dead weight increases, but after precipitation more than level of ground water after precipitation Soil strength has also obtained larger raising, opposite raising and crust layer of the level of ground water more than soil deformation due to intensity simultaneously Soil arching effect counteracts pre-compressed effect of the increase to the lower part soil body of dead weight, and actual measurement level of ground water reduces excessive too fast(It is reduced to Lower 8 meters or so of earth's surface, the level of ground water for not including 7 meters or so of negative pressure usually decline caused overload also in 70kPa to 8 meters Following soil body surcharge preloading, consolidation settlement should significantly increase, but actual measurement is unsatisfactory, and stablizes quickly), in super quiet pore water Soil solidifying is stablized too early relatively instead under the premise of pressure is almost unchanged, so inferring, lowering of watertable causes ground to sink The non-water buoyancy disappearance soil body dead weight of drop main cause, which increases, to be caused, but flow of water difference causes settlement of foundation caused by seepage force, until Few seepage force is the leading factor that sedimentation occurs, so it is pre- that lowering of watertable need not be used to form precipitating, pre-pressing enhancing vacuum Press effect.3rd, conventional vacuum precompressed level of ground water reduces general 2 ~ 3 meters of unobvious, 90% weak soil below 2 ~ 3 meters of levels of ground water Base vacuum preloading carries out under water or in water in fact, illustrate it is that not lowering of watertable vacuum preloading can be achieved on and Negative pressure transmission effect is more preferable;
It is improved to based on above-mentioned analysis:Lowering of watertable does not cover Water Spreading vacuum method and constructs, realization water covering prepressing, It covers water seepage flow, cover water-stop, vacuum seepage consolidates, and measured result is preferable
6th, vaccum pump unit improves
Conventional vacuum precompressed carries out vacuum preloading using open type from the jet pump that overflows, and is improved to conventional light well point and is used Sealed vacuum jet pump, convenient for maintaining, extend service life of equipment, while be easy to implement vacuum preloading and precipitation is strong The perfect linking of construction is rammed, " vacuum is completed using the same integral type well point plastic strip vacuum systems of the same manifold of same equipment Precompressed, precipitating, pre-pressing " foundation stabilization task.
7th, 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;
8th, drain bar improves:
Conventional Degradable plastic water drainage plate is core plate degradation, and practical degradation effect is bad, improves drain bar and uses filter membrane Degradable biological material, does not stay drainage channel to reduce settlement after construction after environmental protection and work, core plate reduces cost simultaneously without degradation Core plate is as reinforcement material reinforcing soft soil;
9th, the remaining plastic draining board of conventional vacuum precompressed often causes certain residual settlement after work, especially construction time Between fail the soft soil foundation fully consolidated, the slow consolidation settlement under load long term after work, formed disease, after improvement, one The superstructure of body formula well point plastic strip pipe(Connect box, well-point pipe and connecting tube)It can pull out, after the completion of vacuum preloading, adopt The superstructure of integral type well point plastic strip pipe is pulled out with pipe extractor, the superstructure of integral type well point plastic strip pipe can repeat profit With, while the not row of staying after the work of the drain bar realization entirety under earth's surface in shallow soil body under noresidue drainage channel, the shallow-layer soil body Aquaporin reduces residual settlement after work;
10th, conventional vacuum precompressed suction underground water, be easy to cause the larger sedimentation of ambient enviroment, covers Water Spreading by being improved to Lowering of watertable vacuum seepage preloading method is not constructed, it is possible to reduce the influence to ambient enviroment;
11st, Water Spreading not lowering of watertable is covered, vacuum dewatering preloading manifold and branch pipe water yield are big, underground water Zhou Erfu The cycle that begins seepage flow, it is ensured that vacuum pump and manifold, manifold system work in the case where full water expires negative pressure state, form negative pressure height, and actual measurement is adopted Large-area treatment region can be allowed to reach 90 ~ 100kPa of negative pressure with less vacuum pump expires table status, and vacuum pump will not go out Existing water shortage burns pump phenomenon;
12nd, conventional precipitation well point mechanical hole building does not often take out water and forms dried-up well, general to recommend to use artificial water jetting 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 looking after It is also impossible to too close to walking is rammed, light well point vacuum-dewatering principle limits that water lift is height-limited, and document finding is most deep at present Light well point also just at 7 meters or so, consider precipitation funnel, therefore level of ground water reduce only 4 ~ 5 meters or so of limit depth, Backfill medium coarse sand is needed to ensure water recharging, 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 now Follow-on precipitation prevalence use deep-well precipitation or tube well dewatering, but in view of two kinds of dewatering modes layout can not possibly it is too close, can only Play the role of precipitation, it is difficult to play vacuum preloading, integral type well point plastic strip vacuum system, filter depth can be dropped than vacuum Well point is deep, takes into account gravity precipitation and vacuum-dewatering, and cheap suitable large area is laid, and not only improves precipitation, and be conducive to Vacuum preloading realizes that mechanized construction pore-forming efficiency is high, since filter is using the higher overlength plastic draining board of water-flowing amount, dried-up well Rate is almost nil, and either precipitation depth is also or precipitation efficiency perfect can substitute the above-mentioned various precipitation gently side of rammer completely Formula;
13rd, early period covers Water Spreading vacuum seepage consolidation precompressed ground using not lowering of watertable, treats that vacuum preloading settles Stablize, open the water that cofferdam aerial drainage stores(Conventional depth of water 50cm or so), continue quick lowering of watertable and play to take into account precipitation While the vacuum preloading of pre-compressed effect, complete precipitation dewatering construction, after improvement can quickly lowering of watertable to 5 ~ 8 meters;
14th, conventional vacuum precompressed dewatering effect is not good enough, and conventional precipitating, pre-pressing 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, the method is particularly suitable for ultra-soft foundation reinforcing of reclaiming fields from the sea, and realization method is to pass through simple artificial insertion Integral type well point plastic strip pipe realizes the shallow-layer vacuum preloading, the vacuum-dewatering that preferably seal, rapidly and efficiently reinforce ultra-soft foundation so as to In the expansion of subsequent mechanical construction.
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.
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
Deep soil 100
The shallow-layer soil body 200.
Specific embodiment
Referring to Fig. 1 ~ Fig. 8, a kind of ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing consolidation of the present invention Method, it includes the following steps:
Step 1: integral type well point plastic strip vacuum system is arranged
1.1st, 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 is carried out using artificial plate Pipe plugs.
Integral type well point plastic strip pipe(Namely improved branch pipe)Including drain bar 1, connection box 2, well-point pipe 3 and connect Take over 4, the drain bar 1 are vertically arranged in deep soil 100, and the length of drain bar 1 is 20m or so, and the well-point pipe 3 is perpendicular To being arranged in the shallow-layer soil body 200, the length of well-point pipe 3 is 6 ~ 9m, and the upper end of drain bar 1 is by connecting box 2 and well-point pipe 3 Lower end connects, and the upper end of well-point pipe 3 is exposed outside the shallow-layer soil body 200, and the upper end of well-point pipe 3 is connect with one end of connecting tube 4, connection The length of pipe 4 is 1 ~ 2m.A diameter of 10 ~ 20mm of well-point pipe 3 and connecting tube 4.
Drain bar 1 includes the filter membrane 1.2 of 1.1 periphery of internal core plate 1.1 and core plate, the core plate 1.1 and filter membrane 1.2 Between form drainage channel 1.3, the core plate 1.1 is made of non-degradable material or material difficult to degrade, and the filter membrane 1.2 is Degradation material is made.
As a preferred embodiment, core plate 1.1 is made of plastic material, filter membrane 1.2 is made of flax material.
As a preferred embodiment, core plate 1.1 includes the main gusset 1.11 and more longitudinally spaced arrangements of a lateral arrangement Secondary gusset 1.12 before and after main gusset 1.11, the sky formed between main ribs plate 1.11, secondary gusset 1.12 and filter membrane 1.2 Gap is drainage channel 1.3.
After drain bar 1 is inserted into ground, as time goes by, since filter membrane 1.2 uses degradation material to be made, filter membrane 1.2 realize fast degradations, filter membrane 1.2 degrade after in ground only remaining core plate 1.1, the soil in ground can fill former filter membrane 1.2 and the space of former drainage channel 1.3 so that soil is fitted closely with core plate 1.1, therefore core plate 1.1 in ground not only There is no gap so that ground continues to settle, and the effect of reinforcement is also acted, improve difference floor heights above and below in ground Integraty.
The lower end of the drain bar 1 is provided with bottom discharge plate end socket, and bottom discharge plate end socket uses plastic adhesive tape paper bag It wraps up in be formed.
The connection box 2 includes housing 2.1, and there are one kissed with 1 upper end shape of drain bar for the lower end setting of the housing 2.1 The lower interface 2.2 of conjunction, there are one the upper interface 2.3 coincideing with 3 lower end shape of well-point pipe, institutes for the upper end setting of the connection box 2 Setting is stated on housing 2.1 there are three screw hole 2.4, the rectangular in cross-section structure of the lower interface 2.2, drain bar 1 during installation Upper end is inserted at lower interface 2.2, and then drain bar 1 and connection box 2 are connected in one by drivescrew in screw hole 2.4, so Afterwards plastic adhesive tape is dressed outside in lower interface 2.2.The upper interface 2.3 is circular tube structure, and the lower end of well-point pipe 3 is sheathed on during installation Outside upper interface 2.3, the lower end of upper interface 2.3 and well-point pipe 3 is then dressed outside into plastic adhesive tape.
The connecting tube 4 is wired hose, and connecting tube 4 includes hose and the spiral wire of Lining Hose.
The well-point pipe 3 is the plastic tubes such as PPR, and well-point pipe 3 is wrapped up with 4 junction of connecting tube by diaphragm seal or steel wire Winding is generated negative-pressure dense sealer after being wrapped up using diaphragm seal, when plastic strip pipe vacuumizes in integral type well point and the more is inhaled the more tight.Well point Pipe 3 can also use same wired hose with connecting tube 4 so that well-point pipe 3 forms integral structure with connecting tube 4.
1.2nd, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system.Institute It states manifold and includes longitudinal tubule (L tubule) 6 and more transverse tubes 5 being connected on longitudinal tubule (L tubule) 6.
The transverse tube 5 is formed by connecting by multiple transverse tubes segmentation 5.1 and mostly logical linkage section 5.2, two neighboring transverse tube segmentation It is attached between 5.1 by mostly logical linkage section 5.2, mostly logical linkage section 5.2 is as a kind of logical preferably using eight logical linkage sections, eight Linkage section includes linkage section main body 5.21, and the left and right ends of linkage section main body are respectively arranged with transverse tube segmentation interface 5.22, even It connects and three connection interface tubes 5.23 is forwardly and rearwardly respectively arranged in section main body 5.21, connection interface tube 5.23 is adjacent Connecting tube 4 is attached, and adjacent 5.1 connection of transverse tube segmentation of transverse tube segmentation interface 5.22, the transverse tube segmentation 5.1 includes One necking section, necking section are set close to mostly logical linkage section 5.2, and the transverse tube segmentation 5.1 further includes straight pipe 5.11, the neck Contracting section includes the first Taper Pipe section 5.12 and the second Taper Pipe section 5.13, the small head end of the first Taper Pipe section 5.12 and the second Taper Pipe section 5.13 small head end docking, the transverse tube segmentation interface of stub end more logical linkage sections 5.2 adjacent thereto of the first Taper Pipe section 5.12 5.22 docking, the stub end of the second Taper Pipe section 5.13 docks with one end of straight pipe 5.11, the other end of straight pipe 5.11 and its The transverse tube segmentation interface 5.22 of adjacent how logical linkage section 5.2 docks.The taper of first Taper Pipe section 5.12 is more than the second Taper Pipe section 5.13 taper, necking section form venturi jet stream effect.
The longitudinal tubule (L tubule) 6 is vertically connected at one end of all transverse tubes 5, and the one end of transverse tube 5 far from longitudinal tubule (L tubule) 6 is provided with transverse tube envelope Head, far from longitudinal tubule (L tubule) 6, the straight pipe 5.11 of the transverse tube segmentation 5.1 on transverse tube 5 is close for the necking section of the transverse tube segmentation 5.1 on transverse tube 5 Longitudinal tubule (L tubule) 6.A piece longitudinal tubule (L tubule) 6 connects more transverse tubes 5, the longitudinal tubule (L tubule) 6 connected by multiple longitudinal tubule (L tubule)s segmentation 6.1 and three-way connection 6.2 and Into two neighboring longitudinal tubule (L tubule) segmentation 6.1 is connected by three-way connection 6.2, and the third interface of three-way connection 6.2 connects the horizontal stroke closed on Pipe 5, longitudinal tubule (L tubule) are segmented on 6.1 and are additionally provided with check valve 6.3, and the end set of longitudinal tubule (L tubule) 6 has longitudinal tubule (L tubule) end socket.
Step 2: vacuum preloading
Integral type well point plastic strip vacuum system starts vacuum preloading 30 ~ 90 days.Underground water is aspirated during vacuum preloading all to return It fills to the cofferdam fill for treating reinforcing area;
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 3: vacuum dewatering preloading
It excavates in the water to gutter stored in the aerial drainage cofferdam fill of cofferdam, starts vacuum dewatering preloading, to reduce underground For the purpose of water level carries out precipitating, pre-pressing, treat that level of ground water reaches requirement(Level of ground water reaches 4 ~ 8m of below ground)And maintain underground 10 ~ 30 day time of water level completes the precipitating, pre-pressing of some cycles until ground settlement stabilization, terminates precipitating, pre-pressing.
If Step 4: need to further reinforce, the precipitating, pre-pressing of multipass can be carried out on aforementioned base and multipass gently rams, formed Certain thickness crust layer.
Note:Integral type well point plastic strip vacuum system can be according to place and soil property situation adjustment spacing and length, construction time Between construction monitoring must synchronize progress, it is necessary to the monitoring project of progress has:Pore water pressure, ground settlement, divides at level of ground water Layer sedimentation, vacuum degree, realize information-aided construction.

Claims (10)

1. a kind of ultra-soft foundation vacuum preloading seepage consolidation combines precipitating, pre-pressing concretion method, it is characterised in that it includes following step Suddenly:
Step 1: integral type well point plastic strip vacuum system is arranged
1.1st, plastic strip pipe in integral type well point, 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;
1.2nd, integral type well point plastic strip pipe Mesh connection manifold and vacuum pump form integral type well point plastic strip vacuum system;
Step 2: vacuum preloading
It is aspirated in underground water whole recharge to the cofferdam fill for treating reinforcing area during vacuum preloading;Integral type well point plastic strip vacuum system System starts vacuum preloading;
Step 3: vacuum dewatering preloading
It excavates in the water to gutter stored in the aerial drainage cofferdam fill of cofferdam, starts vacuum dewatering preloading, with lowering of watertable For the purpose of, it treats that level of ground water reaches requirement, completes the vacuum dewatering preloading of some cycles until ground settlement stabilization, terminates precipitation Precompressed;
Step 4: as needed after vacuum dewatering preloading on the basis of carry out multipass vacuum dewatering preloading and multipass gently ram, Form certain thickness crust layer.
2. a kind of ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion method according to claim 1, special Sign is that vacuum pump is vacuumized and is vacuumized using hierarchical loading.
3. a kind of ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion 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 ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion 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 ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion 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 ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion 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 ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion method according to claim 1, special Sign is that 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 It is attached between segmentation by mostly logical linkage section.
8. a kind of ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion 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 ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion 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 ultra-soft foundation vacuum preloading seepage consolidation joint precipitating, pre-pressing concretion method according to claim 1, special Sign is that 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, two neighboring longitudinal tubule (L tubule) point Section is connected by three-way connection, and the third interface of three-way connection connects the transverse tube closed on, is additionally provided in longitudinal tubule (L tubule) segmentation unidirectional Valve.
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