CN105887902A - Well point plastic strip power solidification method with combination of vacuum preloading and precipitation preloading - Google Patents
Well point plastic strip power solidification method with combination of vacuum preloading and precipitation preloading Download PDFInfo
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- CN105887902A CN105887902A CN201610379609.3A CN201610379609A CN105887902A CN 105887902 A CN105887902 A CN 105887902A CN 201610379609 A CN201610379609 A CN 201610379609A CN 105887902 A CN105887902 A CN 105887902A
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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
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- 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
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- 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
The invention relates to a well point plastic strip power solidification method with combination of vacuum preloading and precipitation preloading. The method is characterized by comprising the following steps that firstly, a field is flattened, and a to-be-strengthened area drains water; then, whether pre-compaction is conducted or not before precipitation is selected; an integrated well point plastic strip vacuum system is arranged; vacuum preloading is conducted, banking is conducted on a cofferdam on the periphery of the to-be-strengthened area, surrounding water resources outside a strengthened area are pumped into the cofferdam of the to-be-strengthened area in advance, vacuum preloading is started, vacuum precipitation preloading starts to be conducted many times, one-time light compaction is set between every two adjacent times of vacuum precipitation preloading, and full compaction is conducted after the last time of vacuum precipitation preloading; and finally, full-field vibration rolling is conducted for measuring the elevation so as to hand over a completed project. The well point plastic strip power solidification method with combination of vacuum preloading and precipitation preloading has the beneficial effects of being easy to operate, low in cost and good in construction effect.
Description
Technical field
The present invention relates to a kind of Treatment Methods of Soft Ground, particularly relate to a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method.
Background technology
Specifying according to " Code for design of building " (GB5007-2011) 7.1.1, soft foundation means the ground being mainly made up of mud, muck soil, rinse fill, miscellaneous fill or other high-compressibility soil layer.Before carrying out construction on soft foundation, needing first to carry out soft foundation consolidation process, conventional consolidation processing methods has following several:
One, conventional vacuum ground preloading, conventional vacuum ground preloading " land and lakes and marhshes territory, sea, river under water " soft soil foundation is required to lay diaphragm seal, sand bedding course, but has the disadvantage in that
1, large area diaphragm seal difficulty of construction is big, and land vacuum preloading needs a large amount of artificial plastic film mulch mechanization degree low, and especially underwater vacuum precompression diaphragm seal is more difficult to construction；
2, the low easy damaged gas leakage of pvc diaphragm seal intensity, one layer of geotextiles cost height of two layers of diaphragm seal, search air leakage point difficult；
3, substantial amounts of pvc diaphragm seal is not environmentally；
4, under film, earth's surface is maximum up to negative pressure 80kPa, and negative pressure is fast toward soil layer deep slippages, typically transmits about every meter of loss negative pressure 10kPa toward deep, and about 8 to 10 meters of earth's surface following soft soil vacuum preloading weak effect, effective reinforcement depth is shallow；
5, loading surface is at original place table or backfill soil table, even if top layer diaphragm seal is air tight, the stabilization zone surrounding shallow-layer soil body leaks gas slowly and still cannot ignore, and in the case of especially about 90 days long time loading, drops to a certain degree stabilization zone surrounding shallow soil body drain gas degree in level of ground water and more causes anxiety.
Two, follow-on vacuum pre-press reinforcing has the disadvantage in that
1, going sand bedding course to change hand-type joint direct-connected plastic strip plate mode into, change indirect transfer negative pressure and transmit negative pressure pattern for direct, but it remains a need for diaphragm seal, peak suction loading surface is still on earth's surface；
2, serous fluid of dredger fill forms sealant or the direct-connected plastic strip of vacuum manifold and buries about 1.5 meters or 3 meters, vacuum chimney filter underground left and right sides plastic uptake row's replacement seal film, 10 days vacuum preloading initial stages right-left seal is preferable, but along with serous fluid of dredger fill dehydration consolidation cracking, level of ground water rapid decrease, sealing effectiveness is had a greatly reduced quality；
3, reclaiming fields from the sea ultra-soft soil cannot mechanical execution, first do artificial plate shallow-layer plastic strip vacuum preloading, treat that its foundation strength is suitable for mechanical execution, do deep vacuum precompressed again, ultra-soft soil vacuum preloading of reclaiming fields from the sea is the most consistent with conventional vacuum precompressed principle technique, artificial and the most mechanical simple difference, process is more complicated, and cost is high, efficiency is low；
90 days underground water level decreasing of vacuum preloading are typically only 1 ~ 3 meter, actual application typically processes deep soft soil foundation, shallow-layer poor effect, reinforces groundwork bearing capacity in theory and is generally about 80kPa, and reality is applied, and shallow top layer foundation bearing capacity is the most too low even only has 30 ~ 50kPa.
Three, vacuum-dewatering associating dynamic consolidation construction has the disadvantage in that
1, Application of light well point precipitation+strong rammer
Tradition house steward and arm, general 6 meters of the arm degree of depth, well point spacing is generally 4*4m, uses vacuum-dewatering, only precipitation or precipitating, pre-pressing function, can not have vacuum preloading negative pressure consolidation concurrently owing to the depth as shallow spacing big time is short simultaneously；
2, tube well dewatering or deep-well precipitation+strong rammer
Tradition house steward and arm, pipe well uses immersible pump gravity precipitation, deep-well precipitation uses the mode that immersible pump gravity precipitation and vacuum-dewatering combine, well-point arrangement spacing is bigger, general 15*15m, thick and thin processing mode, lays particular emphasis on precipitation, can not have vacuum preloading negative pressure consolidation concurrently owing to the spacing excessive time is short simultaneously；
What Dewatering dynamic compaction Ground Treatment was dredged because precipitation is thick layouts and short-term (about 30 days) processing mode, is suitable only for shallow-layer and processes；
The most all methods all exist can improve and optimize part.
Summary of the invention
It is an object of the invention to overcome above-mentioned deficiency, it is provided that a kind of simple to operate, with low cost, well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method that construction effect is good.
The object of the present invention is achieved like this:
Compared with prior art, the invention has the beneficial effects as follows:
1, sealing system improvement one:
Cancel geotextiles geomembrane, sand bedding course, by using the shallow-layer soil body at the well-point pipe of integral type well point plastic strip vacuum system as first sealant；Good sealing effect, simple and reliable, saving material of constructing；
2, Vacuum Loading System improvement one:
Conventional vacuum precompressed, 80KPa negative pressure of vacuum loads and is each provided at earth's surface, after improvement, 80KPa negative pressure maximum is positioned at the earth's surface following shallow-layer soil body and deep soil junction, improve certain depth (first sealant i.e. the degree of depth of the shallow-layer soil body) by improvement vacuum preloading effective reinforcement depth theoretically, decrease simultaneously and treat the reinforcing area the best negative effect brought of surrounding shallow-layer sealing effectiveness；
3, Vacuum Loading System improvement two:
nullConventional vacuum precompressed employings etc. carry compression system，Except early stage is in order to check leaking source and slow down plastic strip earth pillar formation turn on pump rate 60% ~ 80%，Later stage maintains the negative pressure saving energy also to maintain turn on pump rate not less than 80%，Other situation is the most unchanged，After improvement，Use hierarchical loading，Until settling stabilization under this grade of negative pressure load，Improve one-level load level the most again and continue pressurization，Until it is stable，Circulate successively，Step up zone negative pressure to be reinforced to maximum，It is similar to static load test hierarchical loading，Also the work progress of construction multistage loadings is simulated，Consolidation pattern is loaded for varying stress path，Facts have proved，Although conventional vacuum precompressed achieves earth's surface negative pressure 80kPa load level，But the earth's surface following different depth soil body reaches far away more than 80kPa full load condition，This is bigger mistaken ideas，After improvement，The different depth soil body can be realized by unlimited increase vacuum pump quantity in theory by hierarchical loading and all reach the fully loaded negative pressure reinforcing state of more than theoretical limit 80kPa.nullThis improvement is greatly improved vacuum preloading limit consolidation effect，And conventional vacuum precompressed is difficult to infinitely improve vacuum pump quantity and realizes hierarchical loading，Its reason is: one，The more difficult random increase vacuum pump quantity of sealing system membrane system complex，Once can only lay by predetermined number，Vacuum pump quantity cannot be adjusted according to Monitoring Data and realize dynamic load，They are two years old、Along with vacuum pump quantity is continuously increased，Level of ground water declines too fast，The level of ground water above surrounding soil body forms bigger leaking source，The helpless less effective that seem in face of the huge leaking source of semi-infinite body ground such as conventional employing clay envelope wall soil cement envelope wall，The slow gas leakage that the earth's surface sealing system that process materials limits at present shows under ever-increasing vacuum level，Cause the circulation forming a limiting equilibrium，Therefore conventional vacuum is pressed with the vacuum pump quantity of a balance in advance，Also every the vacuum pump processing area 800 ~ 1500 squares often said in specification.This is also vacuum preloading 90 days, the theoretical source of 800 ~ 1500 squares of fixed pattern conclusions of every vacuum pump processing area, after improvement, the groundwater recharge of suction to ground top layer or recharges to ground surrounding, form reinforcing area body of groundwater seepage flow self-circulation system, preferably achieve the vacuum preloading of hierarchical loading；
4, vaccum pump unit improves
Conventional vacuum precompressed uses open type to carry out vacuum preloading from the jet pump that overflows, it is improved to the sealed vacuum jet pump that conventional light well point is used, it is easy to maintaining, extension device service life, simultaneously facilitate the perfect linking realizing vacuum preloading and Dewatering dynamic compaction construction, use same equipment same house steward's same integral type well point plastic strip vacuum system to complete the foundation stabilization task of " vacuum preloading, precipitating, pre-pressing, dynamic consolidation " more than 3 kinds.
5, the improvement of house steward:
Conventional vacuum precompressed house steward is equal diameter pvc pipe or galvanized pipe etc., improving transverse tube uses the transverse tube segmentation of the necking section with self-control venturi jet effect to improve vacuumizing effect, additionally uses manifold linkage section to substitute tradition threeway and improves tubing utilization rate and efficiency of assembling；
6, draining board improves:
Conventional Degradable plastic water drainage plate is central layer degraded, actual degradation effect is the best, improves draining board and uses filter membrane degradable biological material, does not stay drainage channel to reduce settlement after construction after environmental protection and work, central layer, without degraded, reduces cost central layer simultaneously as reinforcement material reinforcing soft soil；
7, the residual settlement that the plastic draining board of conventional vacuum precompressed residual is certain after often causing work, especially construction period fails the soft soil foundation fully consolidated, slow consolidation settlement under work after load long term, form disease, after improvement, the superstructure of integral type well point plastic strip pipe (connects box, well-point pipe and connecting tube) can pull out, at vacuum preloading, after precipitation is gently rammed into, pipe extractor is used to pull out the superstructure of integral type well point plastic strip pipe, the superstructure of integral type well point plastic strip pipe can reuse, noresidue drainage channel in shallow soil body under earth's surface simultaneously, draining board under the shallow-layer soil body does not stay drainage channel after realizing overall work, reduce residual settlement after work；
null8、Conventional precipitation gently rams well point mechanical hole building and does not often take out water formation dried-up well，General recommendation uses artificial water jetting pore-forming，General 200 ~ the 300mm in aperture，General about 1 meter of filter，Pore-forming is the best often cannot water outlet，Cloth dot spacing is rammed walking be also impossible to the closeest owing to being looked after，The limited water lift of light well point vacuum-dewatering principle is height-limited，The light well point that document finding is the deepest at present is the most just at about 7 meters，Consider precipitation funnel，Therefore level of ground water reduces limit depth about 4 ~ 5 meters only，It is required to backfill medium coarse sand and guarantees water recharging，Water yield is less，Cause vacuum jet pump negative pressure to reduce and comparatively fast affect vacuum-dewatering effect，But this causes well point gas leakage negative pressure the highest and leaves sand drain after work and continues the unfavorable factors such as drainage subsidence simultaneously，Therefore present follow-on Dewatering dynamic compaction popular employing deep-well precipitation or tube well dewatering，But layouting in view of two kinds of dewatering modes can not be the closeest，Precipitation effect can only be played，It is difficult to play vacuum preloading effect，Integral type well point plastic strip vacuum system，The filter degree of depth can be deeper than vacuum-dewatering well point，Take into account gravity precipitation and vacuum-dewatering，Low price is suitable for large area and lays，Not only improve precipitation，Be conducive to again vacuum preloading，Realize mechanized construction pore-forming efficiency high，Owing to filter uses the overlength plastic draining board that water-flowing amount is higher，Dried-up well rate is almost nil，Either precipitation depth is also or precipitation efficiency can substitute above-mentioned various precipitation with perfection completely and gently ram mode；
9, conventional vacuum precompressed plastic draining board top is positioned at ground surface, and light rammer can cause place large area water outlet, and topsoil water content is too high, and impact is light then rams construction and quality；After improvement, tamping point position arm is extracted, and next-door neighbour is light to ram area peripheral edge and connect house steward and continue holding level of ground water of drawing water, even if therefore gently ram at this point, underground flood peak is also impossible to break through shallow-layer seepage through soil mass and gently rams to earth surface effects, it is ensured that light ram construction and is dried anhydrous；
10, conventional vacuum precompressed dewatering effect is not good enough, conventional Dewatering dynamic compaction does not has vacuum preloading effect, integral type well point plastic strip vacuum system is laid substantial amounts of draining board and is replaced shorter filter, i.e. can realize quick lowering of watertable, can also efficiently realize vacuum seepage precompressed, a kind of 2 kinds of effects of material, it is achieved the purpose of a material multipurpose efficiency energy saving；
11, conventional vacuum precompressed shallow top layer Effect of Ground Treatment is not good enough, it is not good enough that conventional Dewatering dynamic compaction processes the degree of depth, it is improved to vacuum preloading, precipitating, pre-pressing, precipitation gently rams the multiple effect basement process combined, deep shallow layer foundation is reinforced simultaneously, on the premise of utilizing vacuum preloading deep soil preferably to consolidate, use the crust layer that precipitating, pre-pressing and Dewatering dynamic compaction form about 6 meters at the shallow-layer soil body, multiple effect adds the densification effect of the soil body, decrease settlement after construction, and this improvement is not under increasing bigger cost reasons, complete multiple reinforcing task, it is particularly suited for work China Democratic National Construction Association Factory Building storage ground and airfield runway, town road and railway bed etc.；
12, this method is more suitable for ultra-soft foundation reinforcing of reclaiming fields from the sea, and its implementation is, realizes the preferable shallow-layer precipitation vacuum preloading sealed by the simple artificial integral type well point plastic strip pipe that inserts.
Therefore the present invention has advantage simple to operate, with low cost, that construction effect is good.
Accompanying drawing explanation
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 representation of the integral type well point plastic strip pipe of the present invention.
Fig. 4 is the sectional view of the draining board of the present invention.
Fig. 5 is the structural representation connecting 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 embodiments of the invention one.
Wherein:
Draining board 1, central layer 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 length the 5.11, first Taper Pipe section the 5.12, second Taper Pipe section 5.13, manifold linkage section 5.2, linkage section main body 5.21, transverse tube segmentation interface 5.22, connecting tube interface 5.23
Longitudinal tubule (L tubule) 6, longitudinal tubule (L tubule) segmentation 6.1, three way cock 6.2, check valve 6.3
Vacuum pump 7
Water-stop curtain 8
Deep soil 100
The shallow-layer soil body 200.
Detailed description of the invention
See Fig. 1 ~ Fig. 9, a kind of well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method that the present invention relates to, it comprises the following steps:
Step one, levelling of the land, treat that reinforcing area surrounding excavates gutter draining；
Step 2, select the pre-rammer that do not carries out or carry out before precipitation according to soil condition, energy level fixes tentatively 600 ~ 1000kN.m, square grid spacing 4*4 ~ 7*7m adjustable, it is bulldozed after rammer, selecting construction water-stop curtain 8 by operating mode, water-stop curtain 8 is cement mixing pile lateral seal barricade or mud lateral seal barricade；
Step 3, integral type well point plastic strip vacuum system are arranged
3.1, plastic strip pipe in integral type well point carries out plugging construction and forms integral type well point plastic strip pipe network lattice；
Mesh spacing 1 ~ the 4m of integral type well point plastic strip pipe network lattice is adjustable；
Integral type well point plastic strip pipe (arm after namely improving) includes draining board 1, connects box 2, well-point pipe 3 and connecting tube 4, described draining board 1 is vertically arranged in deep soil 100, a length of about the 20m of draining board 1, described well-point pipe 3 is vertically arranged in the shallow-layer soil body 200, a length of 6 ~ the 9m of well-point pipe 3, the upper end of draining board 1 is connected with the lower end of well-point pipe 3 by connecting box 2, the upper end of well-point pipe 3 is exposed outside the shallow-layer soil body 200, the upper end of well-point pipe 3 is connected with one end of connecting tube 4, a length of 1 ~ 2m of connecting tube 4.Well-point pipe 3 and a diameter of 10 ~ 20mm of connecting tube 4.
Draining board 1 includes central layer 1.1 and the filter membrane 1.2 of central layer 1.1 periphery of inside, drainage channel 1.3 is formed between described central layer 1.1 and filter membrane 1.2, described central layer 1.1 is made for non-degradable material or difficult degradation material, and described filter membrane 1.2 is made for degradation material.
Preferred as one, central layer 1.1 is made for plastic material, and filter membrane 1.2 is made for Caulis et Folium Lini material.
Preferred as one, central layer 1.1 includes the main gusset 1.11 of a lateral arrangement and the many longitudinally spaced secondary gussets 1.12 being arranged in before and after main gusset 1.11, and main ribs plate 1.11, the space formed between secondary gusset 1.12 and filter membrane 1.2 are drainage channel 1.3.
After draining board 1 inserts ground, as time goes by, owing to filter membrane 1.2 uses degradation material to make, filter membrane 1.2 realizes fast degradation, filter membrane 1.2 degraded after in ground the most remaining central layer 1.1, soil in ground can fill former filter membrane 1.2 and the space of former drainage channel 1.3, soil is fitted tightly with central layer 1.1, therefore central layer 1.1 the most do not exist in ground space make ground continue sedimentation, but also serve the effect of reinforcement, the integraty of the most different floor heights in improve ground.
The lower end of described draining board 1 is provided with bottom discharge plate end socket, and bottom discharge plate end socket uses plastic adhesive tape paper to be wrapped to form.
Described connection box 2 includes housing 2.1, the lower end of described housing 2.1 is provided with a lower interface 2.2 coincideing with draining board 1 upper end shape, the upper end of described connection box 2 is provided with a upper interface 2.3 coincideing with well-point pipe 3 lower end shape, three screw holes 2.4 it are provided with on described housing 2.1, the rectangular in cross-section structure of described lower interface 2.2, during installation, the upper end of draining board 1 is inserted at lower interface 2.2, then in screw hole 2.4, draining board 1 and connection box 2 are connected in one by drivescrew, then dress outside plastic adhesive tape at lower interface 2.2.Described upper interface 2.3 is circular tube structure, and during installation, the lower end of well-point pipe 3 is sheathed on outside interface 2.3, then the lower end of upper interface 2.3 with well-point pipe 3 is dressed outside plastic adhesive tape.
Described connecting tube 4 is wired hose, and connecting tube 4 includes the spiral wire of flexible pipe and Lining Hose.
Described well-point pipe 3 is the plastic tubes such as PPR, and well-point pipe 3 and connecting tube 4 junction are wrapped up by diaphragm seal or steel wire winding, after using diaphragm seal parcel, produces negative-pressure dense sealer when integral type well point plastic strip pipe evacuation and is inhaled tighter and tighter.Well-point pipe 3 can also use with connecting tube 4 as wired hose so that well-point pipe 3 and connecting tube 4 form integrative-structure.
3.2, integral type well point plastic strip pipe Mesh connection house steward and vacuum pump form integral type well point plastic strip vacuum system.
Described house steward includes longitudinal tubule (L tubule) 6 and the many transverse tubes 5 being connected on longitudinal tubule (L tubule) 6.
nullDescribed transverse tube 5 is formed by connecting by multiple transverse tube segmentations 5.1 and manifold linkage section 5.2，It is attached by manifold linkage section 5.2 between adjacent two transverse tube segmentations 5.1，Manifold linkage section 5.2 preferably employs eight as one and leads to linkage section，Eight lead to linkage section includes linkage section main body 5.21，The two ends, left and right of linkage section main body are respectively arranged with transverse tube segmentation interface 5.22，Linkage section main body 5.21 is forwardly and rearwardly respectively arranged with three connecting tube interfaces 5.23，The adjacent connecting tube 4 of connecting tube interface 5.23 is attached，The adjacent transverse tube segmentation 5.1 of transverse tube segmentation interface 5.22 connects，Described transverse tube segmentation 5.1 includes a necking section，Necking section is arranged near manifold linkage section 5.2，Described transverse tube segmentation 5.1 also includes straight length 5.11，Described necking section includes the first Taper Pipe section 5.12 and the second Taper Pipe section 5.13，The little head end of the first Taper Pipe section 5.12 and the little head end docking of the second Taper Pipe section 5.13，The stub end of the first Taper Pipe section 5.12 is adjacent the transverse tube segmentation interface 5.22 of manifold linkage section 5.2 and docks，The stub end of the second Taper Pipe section 5.13 docks with one end of straight length 5.11，The transverse tube segmentation interface 5.22 of the manifold linkage section 5.2 that the other end of straight length 5.11 is adjacent docks.The tapering of the first Taper Pipe section 5.12 forms venturi jet effect more than the tapering of the second Taper Pipe section 5.13, necking section.
Described longitudinal tubule (L tubule) 6 is vertically connected at one end of all transverse tubes 5, and transverse tube 5 is provided with transverse tube end socket away from one end of longitudinal tubule (L tubule) 6, and the necking section of the transverse tube segmentation 5.1 on transverse tube 5 is away from longitudinal tubule (L tubule) 6, and the straight length 5.11 of the transverse tube segmentation 5.1 on transverse tube 5 is near longitudinal tubule (L tubule) 6.A piece longitudinal tubule (L tubule) 6 connects many transverse tubes 5, described longitudinal tubule (L tubule) 6 is formed by connecting by multiple longitudinal tubule (L tubule) segmentations 6.1 and three way cock 6.2, adjacent two longitudinal tubule (L tubule) segmentations 6.1 are connected by three way cock 6.2,3rd interface of three way cock 6.2 connects the transverse tube 5 closed on, being additionally provided with check valve 6.3 in longitudinal tubule (L tubule) segmentation 6.1, the end of longitudinal tubule (L tubule) 6 is provided with longitudinal tubule (L tubule) end socket.
Step 4, vacuum preloading
Integral type well point plastic strip vacuum system starts vacuum preloading, its intermediate pump 7 is preferably sealed vacuum jet pump, vacuum pump evacuation uses hierarchical loading evacuation: it is adjustable that the vacuum pump hierarchical loading first order takes every vacuum pump processing area 1800 ~ 2000 squares, first section of negative pressure of house steward is full table 100kPa, house steward's end is not less than 90kPa, treat that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters, it is adjustable that the vacuum pump hierarchical loading second level takes every vacuum pump processing area 1300 ~ 1500 squares, treat that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters, the vacuum pump hierarchical loading third level takes every vacuum pump processing area 800 ~ 1000 squares or following adjustable, by that analogy, treat that sedimentation meets sedimentation in continuous 5 days and is not more than 2 millimeters, reach vacuum preloading and process requirement；
Step 5, starting first pass vacuum dewatering preloading, 5 ~ 10 days adjustable, for the purpose of lowering of watertable, treats that level of ground water reaches requirement (level of ground water reaches below ground 4 ~ 6m), progressively removes house steward at tamping point and prepares first pass and gently ram；
Step 6, first pass gently ram, and energy level fixes tentatively 1500 ~ 2000kN.m, square grid spacing 4*4 ~ 7*7m adjustable, and limit is removed total tube edge and gently rammed, progressively forward impelling, and light rammer front region need to continue precipitation and guarantee that level of ground water is not gone up, and is bulldozed after rammer；
Step 7, integral type well point plastic strip pipe Mesh connection residue house steward and vacuum pump, starts second time vacuum dewatering preloading, and 5 ~ 10 days adjustable, progressively water conservation and remove part house steward at tamping point and prepare second time light rammer after second time vacuum dewatering preloading precipitation completes；
Step 8, second time light rammer, energy level fix tentatively 2000 ~ 2800 kN.m or more than, square grid spacing 4*4 ~ 7*7m adjustable；Limit is removed total tube edge and is gently rammed, progressively forward impelling, and light rammer front region need to continue precipitation and guarantee that level of ground water is not gone up, and is bulldozed after rammer；
Step 9, integral type well point plastic strip pipe Mesh connection residue house steward and vacuum pump, starts the 3rd time vacuum dewatering preloading, and 5 ~ 10 days adjustable, progressively water conservation and remove part house steward at tamping point and prepare full rammer after the 3rd time vacuum dewatering preloading precipitation completes；
Step 10, pull out residue house steward, when the well-point pipe 3 used and connecting tube 4 are split-type structural, well-point pipe 3 and connecting tube 4 are all pulled out, when the well-point pipe 3 used and wired hose that connecting tube 4 is integral type structure, connecting tube 4 more than excision earth's surface, is then in the milk in the well-point pipe 3 under earth's surface.Full rammer, at least stops after second time light rammer 7 days and carries out, and energy level 600 ~ 1000kN.m is bulldozed after rammer；
Step 11, in the whole field vibroroller cmpacting are measured absolute altitude and are handed over.
Note: integral type well point plastic strip vacuum system can adjust spacing and length according to place and soil property situation, vacuum preloading, precipitation and light rammer ordinary circumstance descending water 3 ~ 4 times, gently can be rammed 3 ~ 5 times according to place and soil property situation set-up procedure and pass and duration.Construction period construction monitoring must synchronize to carry out, it is necessary to the monitoring project carried out has: pore water pressure, level of ground water, ground settlement, delaminating deposition, vacuum, it is achieved information-aided construction.
Hereinafter supplement three groups of embodiments:
Embodiment one,
Essential information before basement process:
This ground third layer Muddy Bottoms clay layer water content 55%, modulus of compressibility 2.3MPa, average 15 meters of thickness, layer top buried depth 5m, buried depth 20 meters at the bottom of layer.
Enforcement step:
Step one, levelling of the land, treat that reinforcing area surrounding excavates gutter draining；
Step 2, ram in advance, energy level 800kN.m, square grid spacing 4m*4m, construct after rammer cement mixing pile lateral seal barricade or mud lateral seal barricade；
Step 3, integral type well point plastic strip vacuum system are arranged
3.1, plastic strip pipe in integral type well point carries out plugging construction and forms integral type well point plastic strip pipe network lattice；
The mesh spacing 1.2m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plugs degree of depth 20m
The a length of 14m of draining board 1, a length of 6m of well-point pipe 3, a length of 10cm of connecting tube 4.The diameter 16mm of well-point pipe 3 and connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection house steward and vacuum pump form integral type well point plastic strip vacuum system,
Step 4, vacuum preloading
Start vacuum preloading seepage consolidation；
nullIts intermediate pump 7 is preferably sealed vacuum jet pump，Vacuum pump evacuation uses hierarchical loading evacuation: the vacuum pump hierarchical loading first order takes every vacuum pump processing area 1800 squares，First section of negative pressure of house steward is full table 100kPa，House steward's end is not less than 90kPa，Treat after processing 13 days that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters，The vacuum pump hierarchical loading second level takes every vacuum pump processing area 1300 squares，Treat after processing 8 days that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters，The vacuum pump hierarchical loading third level takes every vacuum pump processing area 800 squares，Treat after processing 8 days that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters，The vacuum pump hierarchical loading fourth stage takes every vacuum pump processing area 600 squares，After processing 15 days, sedimentation meets sedimentation in continuous 5 days no more than 2 millimeters，Reach vacuum preloading and process requirement；
Step 5, start first pass vacuum dewatering preloading, 6 days, for the purpose of lowering of watertable, treat that level of ground water reaches 4m, progressively remove house steward at tamping point and prepare first pass and gently ram；
Step 6, first pass gently ram, and energy level fixes tentatively 1500kN.m, square grid spacing 4m*4m, is bulldozed after rammer；
Step 7, connect residue house steward and vacuum pump, start second time vacuum dewatering preloading, 5 days, progressively water conservation and remove part house steward at tamping point and prepare second time light rammer after second time vacuum dewatering preloading precipitation completes；
Step 8, second time light rammer, energy level fixes tentatively 2000kN.m, square grid spacing 4m*4m；Limit is removed total tube edge and is gently rammed, progressively forward impelling, and light rammer front region need to continue precipitation and guarantee that level of ground water is not gone up, and is bulldozed after rammer；
Step 9, connect residue house steward and vacuum pump, start the 3rd time vacuum dewatering preloading 5 days, progressively water conservation and remove part house steward at tamping point and prepare full rammer after the 3rd time vacuum dewatering preloading precipitation completes；
Step 10, pull out residue house steward, full ram, stop after second time light rammer 7 days and carry out, energy level 800kN.m, it is bulldozed after rammer；
Step 11, in the whole field vibroroller cmpacting are handed over.
Construction monitoring during this Foundation Treatment, negative pressure 80kPa at pore water pressure 6 meters, the average 30kPa of negative pressure at 20 meters, it is 8 meters that level of ground water declines maximum, and descending water level decreasing about 6 meters, earth's surface average settlement amount fifty-fifty is 80cm, calculate that the degree of consolidation is not less than 80%
Foundation detection, foundation bearing capacity is not less than 120kPa, and effective reinforcement depth is not less than 20 meters, forms crust layer static sounding and calculate modulus of compressibility 5 ~ 8MPa in shallow-layer 5 meters, and third layer Muddy Bottoms clay mechanics index of physics is obviously improved.
Embodiment two,
Essential information before basement process
This ground the 4th layer of Muddy Bottoms silty clay layer water content 38%, modulus of compressibility 3.8MPa, thick average 13 meters, layer top buried depth 3m, buried depth 16 meters at the bottom of layer.
Step one, levelling of the land, treat that reinforcing area surrounding excavates gutter draining；
Step 2, do not carry out the pre-rammer before precipitation, construction cement mixing pile lateral seal barricade or mud lateral seal barricade；
Step 3, integral type well point plastic strip vacuum system are arranged
3.1, plastic strip pipe in integral type well point carries out plugging construction and forms integral type well point plastic strip pipe network lattice；
The mesh spacing 1.5m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plugs degree of depth 16m
The a length of 10m of draining board 1, a length of 6m of well-point pipe 3, a length of 10cm of connecting tube 4.The diameter 20mm of well-point pipe 3 and connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection house steward 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, vacuum pump evacuation uses hierarchical loading evacuation: the vacuum pump hierarchical loading first order takes every vacuum pump processing area 2000 squares, first section of negative pressure of house steward is full table 100kPa, house steward's end is not less than 90kPa, treat after processing 10 days that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters, the vacuum pump hierarchical loading second level takes every vacuum pump processing area 1500 squares, treat after processing 7 days that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters, the vacuum pump hierarchical loading third level takes every vacuum pump processing area 800 squares, after processing 15 days, sedimentation meets sedimentation in continuous 5 days no more than 2 millimeters, reach vacuum preloading and process requirement；
Step 5, start first pass vacuum dewatering preloading, 7 days, for the purpose of lowering of watertable, treat that level of ground water reaches 5m, progressively remove house steward at tamping point and prepare first pass and gently ram；
Step 6, first pass gently ram, and energy level fixes tentatively 1800kN.m, square grid spacing 4m*4m, is bulldozed after rammer；
Step 7, connect residue house steward and vacuum pump, start second time vacuum dewatering preloading, 7 days, progressively water conservation and remove part house steward at tamping point and prepare second time light rammer after second time vacuum dewatering preloading precipitation completes；
Step 8, second time light rammer, energy level fixes tentatively 2500kN.m, square grid spacing 4m*4m；Limit is removed total tube edge and is gently rammed, progressively forward impelling, and light rammer front region need to continue precipitation and guarantee that level of ground water is not gone up, and is bulldozed after rammer；
Step 9, connect residue house steward and vacuum pump, start the 3rd time vacuum dewatering preloading 7 days, progressively water conservation and remove part house steward at tamping point and prepare full rammer after the 3rd time vacuum dewatering preloading precipitation completes；
Step 10, pull out residue house steward, full ram, stop after second time light rammer 7 days and carry out, energy level 1000kN.m, it is bulldozed after rammer；
Step 11, in the whole field vibroroller cmpacting are handed over.
Construction monitoring during this Foundation Treatment, negative pressure 86kPa at pore water pressure 6 meters, the average 45kPa of negative pressure at 16 meters, it is 8 meters that level of ground water declines maximum, and descending water level decreasing about 6 meters, earth's surface average settlement amount fifty-fifty is 58cm, calculate that the degree of consolidation is not less than 80%
Foundation detection, foundation bearing capacity is not less than 120kPa, and effective reinforcement depth is not less than 16 meters, forms crust layer static sounding and calculate modulus of compressibility 8 ~ 13MPa in shallow-layer 6 meters, and the 4th layer of Muddy Bottoms silty clay mechanics index of physics is obviously improved.
Embodiment three,
Essential information before basement process
The 2nd layer of Muddy Bottoms clay water content 78% of this ground, modulus of compressibility 2.1MPa, thick average 20 meters, layer top buried depth 4m, buried depth 24 meters at the bottom of layer.
Step one, levelling of the land, the excavation gutter draining of stabilization zone surrounding；
Pre-rammer before step 2, precipitation, energy level 600kN.m, square grid spacing 4m*7m, construct after rammer cement mixing pile lateral seal barricade or mud lateral seal barricade；
Step 3, integral type well point plastic strip vacuum system are arranged
3.1, plastic strip pipe in integral type well point carries out plugging construction and forms integral type well point plastic strip pipe network lattice；
The mesh spacing 1.0m of integral type well point plastic strip pipe network lattice, integral type well-point pipe plugs degree of depth 24m
The a length of 18.5m of draining board 1, a length of 5.5m of well-point pipe 3, a length of 10cm of connecting tube 4.The diameter 16mm of well-point pipe 3 and connecting tube 4.
3.2, integral type well point plastic strip pipe Mesh connection house steward and vacuum pump form integral type well point plastic strip vacuum system,
Step 4, vacuum preloading
Start vacuum preloading seepage consolidation；
nullIts intermediate pump 7 is preferably sealed vacuum jet pump，Vacuum pump evacuation uses hierarchical loading evacuation: the vacuum pump hierarchical loading first order takes every vacuum pump processing area 1800 squares，First section of negative pressure of house steward is full table 100kPa，House steward's end is not less than 90kPa，Treat after processing 25 days that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters，The vacuum pump hierarchical loading second level takes every vacuum pump processing area 1300 squares，Treat after processing 12 days that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters，The vacuum pump hierarchical loading third level takes every vacuum pump processing area 800 squares，Treat after processing 12 days that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters，The vacuum pump hierarchical loading fourth stage takes every vacuum pump processing area 600 squares，After processing 26 days, sedimentation meets sedimentation in continuous 5 days no more than 2 millimeters，Reach vacuum preloading and process requirement；
Step 5, start first pass vacuum dewatering preloading, 10 days, for the purpose of lowering of watertable, treat that level of ground water reaches 4.5m, progressively remove house steward at tamping point and prepare first pass and gently ram；
Step 6, first pass gently ram, and energy level fixes tentatively 1800kN.m, square grid spacing 4m*7m, is bulldozed after rammer；
Step 7, connect residue house steward and vacuum pump, start second time vacuum dewatering preloading, 5 days, progressively water conservation and remove part house steward at tamping point and prepare second time light rammer after second time vacuum dewatering preloading precipitation completes；
Step 8, second time light rammer, energy level fixes tentatively 2300kN.m, square grid spacing 4m*7m；Limit is removed total tube edge and is gently rammed, progressively forward impelling, and light rammer front region need to continue precipitation and guarantee that level of ground water is not gone up, and is bulldozed after rammer；
Step 9, connect residue house steward and vacuum pump, start the 3rd time vacuum dewatering preloading 10 days, progressively water conservation and remove part house steward at tamping point and prepare the 3rd time light rammer after the 3rd time vacuum dewatering preloading precipitation completes；
Step 10, the 3rd time light rammer, energy level 2800kN.m, square grid spacing 4m*7m；Limit is removed total tube edge and is gently rammed, progressively forward impelling, and light rammer front region need to continue precipitation and guarantee that level of ground water is not gone up, and is bulldozed after rammer；
Step 11, connect residue house steward and vacuum pump, start the 4th time vacuum dewatering preloading 10 days, progressively water conservation and remove part house steward at tamping point and prepare full rammer after the 4th time vacuum dewatering preloading precipitation completes；
Step 12, pull out residue house steward, full ram, stop after the 3rd time light rammer 7 days and carry out, energy level 1000kN.m, it is bulldozed after rammer；
Step 13, in the whole field vibroroller cmpacting are handed over.
Construction monitoring during this Foundation Treatment, negative pressure 83kPa at pore water pressure 6 meters, the average 40kPa of negative pressure at 15 meters, negative pressure 20kPa at 24 meters, it is 6.5 meters that level of ground water declines maximum, and descending water level decreasing about 5 meters, earth's surface average settlement amount fifty-fifty is 118cm, calculate that the degree of consolidation is not less than 80%
Foundation detection, foundation bearing capacity is not less than 120kPa, and effective reinforcement depth is not less than 24 meters, forms crust layer static sounding and calculate modulus of compressibility 5.5 ~ 9MPa in shallow-layer 5.5 meters, and the 2nd layer of Muddy Bottoms clay mechanics index of physics is obviously improved.
Claims (10)
1. a well point plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterised in that it comprises the following steps:
First, levelling of the land, area sewerage to be reinforced；
Then, the pre-rammer before not carrying out or carry out precipitation is selected；
Then, plastic strip vacuum system in integral type well point is arranged
Integral type well point plastic strip pipe carries out plugging construction and forms integral type well point plastic strip pipe network lattice；
Integral type well point plastic strip pipe includes draining board, connects box, well-point pipe and connecting tube, described draining board is vertically arranged in deep soil, described well-point pipe is vertically arranged in shallow soil body, the upper end of draining board is connected with the lower end of well-point pipe by connecting box, it is external that shallow soil is exposed in the upper end of well-point pipe, and the upper end of well-point pipe is connected with one end of connecting tube；
Integral type well point plastic strip pipe Mesh connection house steward and vacuum pump form integral type well point plastic strip vacuum system,
Then, vacuum preloading,
Then, start multipass vacuum dewatering preloading, arrange between adjacent twice vacuum dewatering preloading and the gentliest ram, after last vacuum dewatering preloading, carry out full rammer；
Finally, the absolute altitude of vibroroller cmpacting measurement in the whole field is handed over.
A kind of well point the most according to claim 1 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterised in that vacuum pump evacuation uses hierarchical loading evacuation.
A kind of well point the most according to claim 2 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterized in that vacuum pump hierarchical loading vacuum step is as follows: the vacuum pump hierarchical loading first order takes every vacuum pump processing area 1800 ~ 2000 squares, first section of negative pressure of house steward is full table 100kPa, house steward's end is not less than 90kPa, treat that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters, the vacuum pump hierarchical loading second level takes every vacuum pump processing area 1300 ~ 1500 squares, treat that sedimentation meets sedimentation for three days on end and is not more than 3 millimeters, the vacuum pump hierarchical loading third level takes every vacuum pump processing area 800 ~ 1000 squares or less, by that analogy, treat that sedimentation meets sedimentation in continuous 5 days and is not more than 2 millimeters, reach vacuum preloading and process requirement.
A kind of well point the most according to claim 1 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterized in that draining board includes the central layer of inside and the filter membrane that central layer is peripheral, drainage channel is formed between described central layer and filter membrane, described central layer is non-degradable material or difficult degradation material is made, and described filter membrane is that degradation material is made.
A kind of well point the most according to claim 4 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterized in that central layer includes the main gusset of a lateral arrangement and the many longitudinally spaced secondary gussets being arranged in before and after main gusset, main ribs plate, the space formed between secondary gusset and filter membrane are drainage channel.
A kind of well point the most according to claim 1 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterised in that described connecting tube is wired hose, and connecting tube includes the spiral wire of flexible pipe and Lining Hose.
A kind of well point the most according to claim 1 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterized in that house steward includes transverse tube, described transverse tube is formed by connecting by multiple transverse tube segmentations and manifold linkage section, is attached by manifold linkage section between adjacent two transverse tube segmentations.
A kind of well point the most according to claim 7 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterized in that manifold linkage section uses eight to lead to linkage section, eight lead to linkage section includes linkage section main body, the two ends, left and right of linkage section main body are respectively arranged with transverse tube segmentation interface, linkage section main body is forwardly and rearwardly respectively arranged with three connecting tube interfaces, the adjacent connecting tube of connecting tube interface is attached, and the adjacent transverse tube segmentation of transverse tube segmentation interface connects.
A kind of well point the most according to claim 7 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterized in that described transverse tube segmentation includes a necking section and straight length, the distance of the necking section of same transverse tube segmentation to longitudinal tubule (L tubule) is than the distance of straight length to longitudinal tubule (L tubule).
A kind of well point the most according to claim 1 plastic strip vacuum pre-pressed joint precipitating, pre-pressing dynamic consolidation method, it is characterized in that house steward includes longitudinal tubule (L tubule), described longitudinal tubule (L tubule) is formed by connecting by multiple longitudinal tubule (L tubule) segmentations and three way cock, adjacent two longitudinal tubule (L tubule) segmentations are connected by three way cock, 3rd interface of three way cock connects the transverse tube closed on, and longitudinal tubule (L tubule) segmentation is additionally provided with check valve.
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