CN108265697A - Vacuum prepressing ground foundation treatment method - Google Patents
Vacuum prepressing ground foundation treatment method Download PDFInfo
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- CN108265697A CN108265697A CN201611257399.7A CN201611257399A CN108265697A CN 108265697 A CN108265697 A CN 108265697A CN 201611257399 A CN201611257399 A CN 201611257399A CN 108265697 A CN108265697 A CN 108265697A
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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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- Agronomy & Crop Science (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Disclose a kind of vacuum prepressing ground foundation treatment method.This method can include：Sand bedding course is laid with, and drainage channel is laid on sand bedding course on former mud face；Press mold ditch is dug around along sand bedding course, and is laid with diaphragm seal；Monitoring instrument and vacuum pump are installed, and pass through vacuum pump to being evacuated precompressed ground in diaphragm seal；After pumping precompressed reaches unloading standard, vacuum preloading unloading changes and tamps film ditch, wherein, it changes and tamps film ditch and include：Press mold ditch internal water accumulation is emptied, and removes soil layer in press mold ditch；Layering, which is changed, in press mold ditch fills out flour sand and is successively compacted.The present invention is compacted press mold ditch, eliminates the weak band of Soft Ground Improved By Vacuum Preloading, prolong the service life by carrying out being layered to change filling out to press mold ditch.
Description
Technical field
The present invention relates to field of civil engineering, more particularly, to a kind of vacuum prepressing ground foundation treatment method.
Background technology
China coast is dispersed with a large amount of soft soil foundation, mainly using silt clay, very soft sill clay and mud as
Main, in recent years as Harbor economy flourishes, coastal hydraulic reclamation causes a large amount of soft soil foundation, and vacuum is used in work progress
Precompressed treatment technology can avoid the transport of the extensive preloading earthwork, solve heap material containing raw material, and Tu Yuan finds difficult, preloading
The problems such as material and transportation cost are high.Large amount of cubic metres of earth of outward transports have difficulties after the completion of avoiding preloading, and the difficult searching of point is stacked in outward transport,
The problems such as causing a large amount of machinery and freight.Meanwhile vacuum preloading treatment technology can be more environmentally friendly, quickly finishes ground
Consolidation process shortens the construction time.
However, after vacuum preloading unloading, soil layer consolidation effect base in the consolidation effect of the soil layer below press mold bottom of trench and area
This is consistent, more than bottom of trench (i.e. part on film, diaphragm seal will be pressed in bottom of trench) part soil, due to not obtaining vacuum consolidation, then add
The long period of soaking of overlying water is still generally mud, Muddy Bottoms state, is weak band in entire precompressed place, it is impossible to directly make
It is used for place.Therefore, it is necessary to develop a kind of vacuum prepressing ground foundation treatment method that after-treatment is carried out to press mold ditch.
The information for being disclosed in background of invention part is merely intended to deepen the reason of the general background technology to the present invention
Solution, and be not construed as recognizing or to imply that the information is formed in any form known to those skilled in the art existing
Technology.
Invention content
The present invention proposes a kind of vacuum prepressing ground foundation treatment method, the method may include：It is laid on former mud face
Sand bedding course, and it is laid with drainage channel on the sand bedding course；Press mold ditch is dug along around the sand bedding course, and is laid with diaphragm seal；
Monitoring instrument and vacuum pump are installed, and by the vacuum pump to being evacuated ground described in precompressed in the diaphragm seal；It is evacuated precompressed
After reaching unloading standard, vacuum preloading unloading changes and fills out the press mold ditch, wherein, it changes and fills out the press mold ditch and include：Empty the pressure
Film ditch internal water accumulation, and remove soil layer in the press mold ditch；Layering, which is changed, in the press mold ditch fills out flour sand and is successively compacted.
It can be compacted press mold ditch, eliminate the weak band of Soft Ground Improved By Vacuum Preloading, prolong by carrying out being layered to change filling out to press mold ditch
Long life.
Methods and apparatus of the present invention has other characteristics and advantages, these characteristics and advantages are attached from what is be incorporated herein
It will be apparent in figure and subsequent specific embodiment or will be in the attached drawing being incorporated herein and subsequent specific reality
It applies in mode and is stated in detail, these the drawings and specific embodiments are used together to explain the specific principle of the present invention.
Description of the drawings
Exemplary embodiment of the invention is described in more detail in conjunction with the accompanying drawings, it is of the invention above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein, in exemplary embodiment of the invention, identical reference label
Typically represent same parts.
Fig. 1 shows the flow chart of the step of vacuum prepressing ground foundation treatment method according to the present invention.
Specific embodiment
The present invention is more fully described below with reference to accompanying drawings.Although the preferred implementation side of the present invention is shown in attached drawing
Formula, however, it is to be appreciated that may be realized in various forms the present invention without should be limited by embodiments set forth herein.Phase
Instead, these embodiments are provided so that the present invention is more thorough and complete, and can be by the scope of the present invention completely
It is communicated to those skilled in the art.
Embodiment
Fig. 1 shows the flow chart of the step of vacuum prepressing ground foundation treatment method according to the present invention.
In this embodiment, vacuum prepressing ground foundation treatment method according to the present invention can include：Step 101, in original
Sand bedding course is laid on mud face, and drainage channel is laid on sand bedding course；Step 102, press mold ditch is dug along around sand bedding course, and is spread
If diaphragm seal；Step 103, monitoring instrument and vacuum pump are installed, and pass through vacuum pump to being evacuated precompressed ground in diaphragm seal；And
Step 104, after pumping precompressed reaches unloading standard, vacuum preloading unloading changes and tamps film ditch, wherein, it changes and tamps film ditch and include：Row
Pneumatics film ditch internal water accumulation, and remove soil layer in press mold ditch；Layering, which is changed, in press mold ditch fills out flour sand and is successively compacted.
The embodiment is compacted press mold ditch, eliminates the weakness of Soft Ground Improved By Vacuum Preloading by carrying out being layered to change filling out to press mold ditch
Band prolongs the service life.
The following detailed description of the specific steps of vacuum prepressing ground foundation treatment method according to the present invention.
In one example, sand bedding course is laid with, and drainage channel is laid on sand bedding course on former mud face.
In one example, sand bedding course is laid with to include：It is laid with woven cloth, chaste tree fragrant plant bed course and geotechnique successively on former mud face
Cloth；It is pushed away successively in geotextiles and fills out flour sand bed course and medium coarse sand bed course.
In one example, drainage channel includes drain bar and chimney filter.
In one example, drainage channel is laid with to include：Drain bar is set to former mud bottom, drain bar wrench embedment sand pad
Layer；Chimney filter is set, and is connect with drain bar.
Specifically, it is smooth to place progress before construction, it is laid with woven cloth, chaste tree fragrant plant pad successively on the former mud face after smooth
Layer, geotextiles, the number of plies of material-paving can suitably be adjusted according to live soil property weakness situation.It is artificial uniformly push away fill out flour sand bed course with
Medium coarse sand bed course.For the region of filling construction requirement cannot be met, sand bedding course is laid with after taking reinforcement measure.
Drain bar connect the aorta that formed drainage channel is entire vacuum system with chimney filter, and chimney filter is laid and chimney filter
The vacuumizing effect of whole system is directly related to the quality of connection of drain bar, to ensure the smooth of aorta.First, it sets
High performance plastics drain bar to former mud bottom, drain bar bottom does crash handling, is triangularly arranged, during setting drain bar
Pay attention to avoiding the occurrence of and emit mud, phenomena such as wrench pollutes, in appearance more than phenomenon, adopt remedial measures in time, and clear up in time.
After the completion of drainage plate striking, wrench is embedded in medium coarse sand bed course.
Vacuum chimney filter uses flexible porous tube, tube body punching and outsourcing permeable filter cloth, and one is set per between two rows drain bar
Chimney filter, it is spaced apart between every Horizontal filter pipe, it is in close contact between drain bar and chimney filter.Connecting component is threeway and four
It is logical, it is produced once molding using primary material, intensity is higher than the tube body intensity of vacuum chimney filter.It, after drain bar is connect with chimney filter
It asks and geotextiles is wrapped up in outside junction, the soil particle of mud is avoided to enter contact surface.It is attached that chimney filter is first put into burial place before embedded
Closely, it then ditches on sandy soil by chimney filter installation position, chimney filter is put into ditch and is buried, handle connector and film outlet port well, filter
It must be tamped around pipe with sand.Connection is socketed using skeleton sebific duct between pipe, the connections such as chimney filter joint four-way, threeway, and four
All corners are connected with two siphunculus, and bind to ensure securely with galvanized wire.To prevent galvanized wire connector from puncturing diaphragm seal, galvanized wire connector
It should be embedded to layer of sand downward.To ensure that the filter membrane on chimney filter is not damaged in process of deployment, seamless coating steel pipe is used at membrane
It is connected with connector.
In one example, curtain wall is set up around Soft Ground Improved By Vacuum Preloading.
Specifically, stake position is drawn by vacuum preloading area plan view and major axis to lay out pile figure, use according to design drawing
Total powerstation or GPS accurately release clay sealing curtain wall center control stake position, are then used and inserted by the pilespacing of design requirement with steel ruler
The mode of bamboo chip or lath lays out pile, while measure field ground elevation along vacuum preloading peripheral sealing wall, determines sealing
Wall stake top and stake bottom absolute altitude carry out review examination, construction of spudding in can be carried out after confirmation is errorless.Using curtain wall theoretical centerline as ditch
According to bearing capacity situation, groove is excavated using mini-excavator or manually along axis for the center line of slot, in construction with beat with
It digs, ensures that slurries are not excessive, to ensure the normal construction of curtain wall.In parallel guide slots both sides, setting can be with the mark of rehabilitation centers line
Stake, so that in the case where having excavated groove, can also check groove at any time moves towards center line and stake position.To mixing before construction
With center line of wall unwrapping wire, make mixer that slurry tube head face center line be sent to mix and stir, arrange 1 control stake at a certain distance.Shifting is stirred
Mix machine positioning carry out construction mix and stir, positioning is marked according to axis before each telephone-moving.
Slurrying using clay add bentonite mix after slurrying, feed before be first sampled to laboratory progress grain size analysis chemical examination,
To determine the fine grained soil content in sample and determine whether to meet requirement.Slurrying is completed using cylindrical blender,
A certain amount of water is first added according to every tank amount of mixing and stirring, adds bentonite in proportion, then clay is added to be stirred simultaneously into agitator
It is required according to mud density, adds water and clay.Surrounding filling bagged sand is dug beside injection curtain wall and encloses stock tank dam, stock tank
Safeguard that the quantity of stock tank is determined according to the traffic at scene and the quantities of curtain wall using plastic foil in bottom.
In one example, press mold ditch is dug along around sand bedding course, and is laid with diaphragm seal.
In one example, diaphragm seal is laid with to include：Membrane device is installed；Diaphragm seal is laid with, seals press mold ditch.
In one example, the number of plies of diaphragm seal is 2-5 layers.
Specifically, press mold ditch is dug along around sand bedding course in vacuum preloading area.Before press mold ditch excavates, put with GPS receiver
Go out the position of press mold ditch.Timber is stamped as control point in angle point, and the press mold ditch position line is marked with lime.It will by design drawing
It asks, press mold ditch is excavated on sand bedding course side.When digging press mold ditch, ditch both sides are protected with geotextiles or other materials, avoid dirt
Contaminate sand bedding course.Press mold ditch uses the operating type that hand fit's Miniature digging machine excavates, sand, the silty dug out out of press mold ditch area
The sundries complete liquidation such as clay, geotextiles is clean, and transports to appointed place outside stabilization zone and store.Smooth nothing is answered on slope inside and outside press mold ditch
Sand material exists, and ensures that diaphragm seal comes into full contact with ditch underclay, meets seal request；As bottom of trench or both sides have the permeability preferable
Interlayer exists, and should excavate the interlayer totally, backfill bury.Press mold ditch excavate when, drain bar cannot be cut, should along limes marginis to
On be inserted into sand bedding course, after gutter is dug, the sundries of gutter bottom is thoroughly removed, to avoid diaphragm seal is punctured.Press mold ditch
It is tamped during backfill with clay, clay wants wet and soft, it is impossible to have bulk, to ensure the leakproofness of film.
Vacuum preloading area is laid with 3 floor diaphragm seal, and carries out the sealing of press mold ditch.Membrane to be installed before diaphragm seal is laid with
Device.Lateral chimney filter and and the position that intersects of longitudinal chimney filter, membrane device is set, and membrane device and chimney filter are connected to transverse direction
It is had to closely with longitudinal direction, and there are certain extendable rooms, in order to avoid differential settlement destroys, are connected in chimney filter with membrane device
After good, chimney filter and membrane device landfill are fixed with sand.The installation key of membrane device will resolve membrane device and film
Sealing problem, it is impossible to which gas leakage, the flange of membrane device is smooth, and the inside and outside of diaphragm seal will install rubber washer, and on it
Add painting fluid sealant.Stabilization zone film sealed around should tread in that mud etc. is waterproof, below airtight layer top surface.
In one example, monitoring instrument and vacuum pump are installed, and pass through vacuum pump to being evacuated precompressed ground in diaphragm seal.
In one example, the laying area of vacuum pump is 800m2-1200m2。
In one example, pumping precompressed ground includes：Examination vacuumizes, and gas leakage is checked for by monitoring instrument；Formally
Precompressed ground is evacuated, and carries out vacuum degree record.
Specifically, the laying requirement of the monitoring instruments such as piezometer, vacuum degree test probe carries out before chimney filter is bound, with
Exempt from the laying of influence diaphragm seal.The laying of vacuum pump is according to about per 1000m2Cloth one arranges that vacuum pump is pacified along stabilization zone boundary
It must assure that position is accurate during dress, and sealing encrypted using rubber gasket, finally power on.The connection of vacuum line is tight
Lattice seal, and check-valves and pipe valve are set in vacuum line.The exposed parts such as vacuum pump and its connection pipeline should carry out anti-corrosion, prevent
Rust measure.It is debugged, is checked on the quality after installation, performed pumping and prepare.
Examination pumping is carried out before formal vacuumize, during examination is taken out construction manager to check every pump working order and
The sealing situation of film checks whether there is gas leakage situation, and glues benefit with glue in time, it is also necessary to the work of vacuum pump is checked by platform
The pressure of efficiency and vacuum meter is equipped with 4 vacuum pumps per area to replace in time, to cover water in time after the completion of repairing is checked.
Vacuumizing phase is tried, vacuum pressure should reach 0.06-0.08Mpa under film, if less than this value, reason should be searched immediately, in film surface
Go through whether there is air-leak section at upper and sealing ditch.Since trying to be evacuated, i.e., it should carry out the sight of the parameters such as vacuum pressure, settling amount
It surveys.After vacuum degree reaches 85Kpa, check and accept in time.
After acceptance(check), carry out covering water being transferred to normal pumping, be continued for 95 days, this stage is vacuum pre-press reinforcing foundation
Main Stage, it is desirable that lower vacuum degree should be stablized in more than 85KPa.
After covering water, vacuum pressure will be kept stable under film.In pumping process, the normal operation of pump, jet stream case are maintained
Interior recirculated water will be continuously replenished.Time sight vacuum pressure value finds that vacuum pressure has decline phenomenon, searches reason immediately, sends out
Existing problem and timely processing.When vacuumizing, such as find that sealing goes wrong, and should search reason, and carry out remediation in time.Often
Its timing carries out vacuum degree record, for equipment operation, electric power thus supplied and the related condition of construction of vacuum preloading be intended into
The stringent record in detail of row, vacuum degree record is arranged in time by supervision requirement to be reported.The degree of consolidation calculated by in-situ settlement curve is big
In 60%, continuous 5 days Tested settlement rates are not more than 3mm/ days, and squeeze time and Settlement criterion can be carried out according to measured data
Adjustment.After meeting unloading standard, stop pumping, unloading carries out corresponding validity check.
In one example, after pumping precompressed reaches unloading standard, vacuum preloading unloading changes and tamps film ditch.
In one example, it changes and tamps film ditch and include：Press mold ditch internal water accumulation is emptied, and removes soil layer in press mold ditch；It is pressing
Layering, which is changed, in film ditch fills out flour sand and is successively compacted.
Specifically, after vacuum preloading unloading, soil layer consolidation effect in the consolidation effect of the soil layer below press mold bottom of trench and area
It is basically identical, more than bottom of trench (i.e. part on film, diaphragm seal will be pressed in bottom of trench) part soil, due to not obtaining vacuum consolidation, then
Add the long period of soaking of overlying water, be still generally mud, Muddy Bottoms state, be weak band in entire precompressed place, it is impossible to directly
It is used as place, needs to carry out after-treatment.
After vacuum preloading, press mold ditch change and fills out processing, changed filler and use flour sand, change after filling out and be compacted, compactness
Coefficient is not less than 90%.It changes when filling out, first empties press mold ditch internal water accumulation, the clay in press mold ditch or mud are removed with excavator,
Flour sand is changed with excavator again and is filled in press mold ditch.Change taken when filling out layering change fill out, the method for hand compaction, change after filling out absolute altitude
It is compacted using machinery, makes its treatment effect not less than vacuum preloading effect in area.
Using example
A concrete application example is given below in the scheme and its effect of embodiment of the present invention for ease of understanding.Ability
Field technique personnel should be understood that the example only for the purposes of understanding the present invention, and any detail is not intended in any way
The limitation present invention.
It is smooth to place progress before construction, it is being laid with one layer of woven cloth, one layer of chaste tree fragrant plant after smooth successively on former mud face
Bed course, one layer of geotextiles.Artificial uniformly push away fills out 0.6m thickness flour sand bed courses, and 0.4m thickness medium coarse sand bed courses are applied to that cannot meet to fill
The region of work requirement, should take reinforcement measure to be laid with sand bedding course.
High performance plastics drain bar is set to mud bottom, plastic draining board bottom 0.5m does crash handling, triangle cloth
It puts, spacing 0.8m, sets to avoid the occurrence of during plastic draining board and emit mud, phenomena such as wrench pollutes, more than phenomenon such as occur,
It should take measures, and clear up in time.After the completion of drainage plate striking, 5-10cm in wrench embedment medium coarse sand bed course.
Vacuum chimney filter uses flexible porous tube, and soft chimney filter is selected using caliber 63mm chimney filters, and simultaneously outsourcing is saturating for tube body punching
Water filter cloth sets a chimney filter per between two rows drain bar, 30m-50m is spaced between every Horizontal filter pipe.Connecting component is threeway
And four-way, it is produced once molding using primary material, intensity is higher than the tube body intensity of vacuum chimney filter.Drain bar is connect with chimney filter
Afterwards, it is desirable that geotextiles are wrapped up in outside junction, the soil particle of mud is avoided to enter contact surface.After drain bar is connect with chimney filter, it is desirable that
Geotextiles are wrapped up in outside junction, the soil particle of mud is avoided to enter contact surface.First chimney filter is put near burial place before embedded,
Then it ditches on sandy soil by chimney filter installation position, chimney filter is put into ditch and is buried, handle connector and film outlet port well, chimney filter will
Embedded sandy soil top surface 0.3m is deep, must be tamped around chimney filter with sand.Connection is socketed using skeleton sebific duct between pipe, is socketed length
Not less than 100mm, the connections such as chimney filter joint four-way, threeway, surrounding corner is connected with two siphunculus, and with galvanized wire bind with
Ensure securely.To prevent galvanized wire connector from puncturing diaphragm seal, galvanized wire connector should be embedded to layer of sand downward.To ensure to filter in process of deployment
Filter membrane on pipe is not damaged, is connected at membrane using seamless coating steel pipe with connector, goes out film surface about 30cm.
Stake position is drawn by vacuum preloading area plan view and major axis according to design drawing to lay out pile figure, using total powerstation or
GPS accurately releases clay sealing curtain wall center control stake position, then with steel ruler by pilespacing slotting bamboo chip or the plate of design requirement
The mode of item lays out pile along vacuum preloading peripheral sealing wall, while measure field ground elevation, determines envelope wall stake top and is
6.1m, stake bottom absolute altitude are -2.5m, carry out review examination, construction of spudding in can be carried out after confirmation is errorless.With curtain wall theoretical centerline
For the center line of groove, according to bearing capacity situation, groove is excavated using mini-excavator or manually along axis, guide groove size will
The wide each 0.6m in centering line both sides, deep 1.0m.With beating with digging in construction, ensure that slurries are not excessive, to ensure curtain wall just
Often construction.In parallel guide slots both sides setting can with the stake of rehabilitation centers line so as in the case where having excavated groove,
Can check groove at any time moves towards center line and stake position.To mixing and stirring center line of wall unwrapping wire before construction, mixer is made to send slurry tube head just
Center line is mixed and stirred, 1 control stake is arranged every 10m.Shifting blender positioning carries out construction and mixes and stirs, according to axis before each telephone-moving
Positioning is marked, error is in the range of ± 50mm.
Slurrying using clay add bentonite mix after slurrying, clay incorporation be not less than 20%, feed before be first sampled to reality
It tests room and carries out grain size analysis chemical examination, to determine the fine grained soil content in sample and determine whether to meet requirement.Bentonite master
Ingredient is wanted to want object for silica, alundum (Al2O3) (the two and ＞ 80%) and other micro-oxidations, granularity requirements are：150-
300 mesh percent of pass ＞ 90%.Slurrying is completed using double deep mixers that stir, and cutter head is stirred for two a diameter of 70cm's
Knife, lap one another 20cm, applies the figure of eight that wide 120cm, long 70cm can be formed when stirring, is arranged in order.Mud density is 1.3, is stirred
Control quality of mud fluid by mud density during mixing, and the density of stirring mud every time tested with densitometer, per slush water and
Soil presses 1：1 mixing, bentonite infiltration capacity 5% are tested at any time with densitometer, and reaching 1.3 rears per slush can be used.Mix and stir wall
Depth away from ground depth gauge, is subject to mouth spray and penetrates ventilative (water) layer into airtight (water) layer 1.0m, defeated according to injection
Slurry mixes and stirs, promotes the defeated sequence mixed and stirred of starching using 4 whitewashings, 4 stirrings, mixes and stirs process according to grouting quantity control injection and promotion
Rate mixes and stirs back wall clay content and should be greater than 15%, and infiltration coefficient is not more than 1*10-5cm/s.It mixes and stirs and is mixed and stirred using twin shaft, it is single
The slurrying of axis stirring blade is 0.7m, overlaps 0.2m between stake, mixes and stirs width 1.2m, after mixer often mixes a pile, shifts 0.5m, takes
0.2m is met, it is larger to mix and stir bit wear in wall work progress, and bit diameter is less than 70cm, more bit change or repair welding.In injection curtain
3m*3m, depth 1.5m are dug beside wall, surrounding filling bagged sand encloses stock tank dam, and stock tank bottom is safeguarded using plastic foil.
Press mold ditch is dug along around sand bedding course in vacuum preloading area.Before press mold ditch excavates, press mold ditch is released with GPS receiver
Position.Timber is stamped as control point in angle point, and the press mold ditch position line is marked with lime.By design drawing requirement, in sand pad
Excavate press mold ditch in layer side.Press mold trench depth will penetrate air-permeable layer and enter airtight layer 0.5m.Press mold ditch bottom width is more than
0.8m.When digging press mold ditch, ditch both sides are protected with geotextiles or other materials, avoid pollution sand bedding course.Press mold ditch uses
The operating type that hand fit's Miniature digging machine excavates is complete sundries such as sand, silty clay, the geotextiles dug out out of press mold ditch area
Portion cleans out, and transports to appointed place outside stabilization zone and store.Slope should smoothly exist without sand material inside and outside press mold ditch, ensure diaphragm seal
It is come into full contact with ditch underclay, meets seal request, which is excavated to the bury for totally backfilling 40cm thickness.Press mold ditch is opened
During digging, drain bar cannot be cut, and at least 200mm is inserted upwardly into sand bedding course along limes marginis.After gutter is dug, by gutter bottom
Sundries is thoroughly removed, to avoid diaphragm seal is punctured.Press mold ditch is tamped when backfilling with clay, and backfill height is 0.8m on sand bedding course,
Clay wants wet and soft, it is impossible to have bulk, to ensure the leakproofness of film.
Vacuum preloading area is laid with 3 floor diaphragm seal, and carries out the sealing of press mold ditch.Membrane to be installed before diaphragm seal is laid with
Device.Lateral chimney filter and and the position that intersects of longitudinal chimney filter, membrane device is set, and membrane device and chimney filter are connected to transverse direction
It is had to closely with longitudinal direction, and there are certain extendable rooms, in order to avoid differential settlement destroys, are connected in chimney filter with membrane device
After good, chimney filter and membrane device landfill are fixed with sand.The installation key of membrane device will resolve membrane device and film
Sealing problem, it is impossible to which gas leakage, the flange of membrane device is smooth, and the inside and outside of diaphragm seal will install rubber washer, and on it
Add painting fluid sealant.Stabilization zone film sealed around should tread in that mud etc. is waterproof, 0.5m below airtight layer top surface.
The laying requirement of the monitoring instruments such as piezometer, vacuum degree test probe carries out before chimney filter is bound, in order to avoid influence
The laying of diaphragm seal.Vacuum pump use 7.5kw vacuum pumps, and can be formed be not less than 0.096MPa vacuum pressure, lay according to
About per 1000m2Cloth one arranges that vacuum pump must assure that position is accurate when installing along stabilization zone boundary, and using rubber seal
Pad encryption sealing, finally powers on.The connection of vacuum line will be sealed strictly, and check-valves is set in vacuum line and is cut
Door.The exposed parts such as vacuum pump and its connection pipeline should carry out anti-corrosion, rust preventing.It is debugged, is checked on the quality after installation, made
Good pumping prepares.
Examination pumping is carried out before formal vacuumize, during examination is taken out construction manager to check every pump working order and
The sealing situation of film checks whether there is gas leakage situation, and glues benefit with glue in time, it is also necessary to the work of vacuum pump is checked by platform
The pressure of efficiency and vacuum meter is equipped with 4 vacuum pumps per area to replace in time, to cover water in time after the completion of repairing is checked.
Vacuumizing phase is tried, vacuum pressure should reach 0.06-0.08Mpa under film, if less than this value, reason should be searched immediately, in film surface
Go through whether there is air-leak section at upper and sealing ditch.Since trying to be evacuated, i.e., it should carry out the sight of the parameters such as vacuum pressure, settling amount
It surveys.After vacuum degree reaches 85Kpa, check and accept in time.
It after acceptance(check), carries out covering water, covers water thickness for 30-40cm, be transferred to normal pumping, be continued for 95 days, vacuum
Degree is stablized in more than 85KPa.
After covering water, vacuum pressure will be kept stable under film.In pumping process, the normal operation of pump, jet stream case are maintained
Interior recirculated water will be continuously replenished.Every 2 hours observation vacuum pressure values, it is found that vacuum pressure has decline phenomenon, search reason immediately,
It pinpoints the problems and timely processing.When vacuumizing, such as find that sealing goes wrong, and should search reason, and carry out remediation in time.
Timing carries out vacuum degree record daily, and for equipment operation, electric power thus supplied and the related condition of construction of vacuum preloading are intended to
Stringent record in detail is carried out, vacuum degree record is arranged in time by supervision requirement to be reported.The degree of consolidation calculated by in-situ settlement curve
More than 60%, continuous 5 days Tested settlement rates are not more than 3mm/ days, squeeze time and Settlement criterion can according to measured data into
Row adjustment.After meeting unloading standard, stop pumping, unloading carries out corresponding validity check.
After vacuum preloading unloading, changing at least 1.5m is carried out to press mold ditch and fills out processing, filler is changed using flour sand, changes after filling out and press
Real, compactness coefficient is not less than 90%.It changes when filling out, first empties press mold ditch internal water accumulation, by the clay in press mold ditch or mud digging
Pick machine is removed, then is changed flour sand with excavator and be filled in press mold ditch.Change taken when filling out layering change fill out, the method for hand compaction, point
Layer thickness is not more than 50cm, changes after filling out absolute altitude and is compacted using machinery, makes its treatment effect not less than vacuum preloading in area
Effect.
This method is compacted press mold ditch, eliminates the weak band of Soft Ground Improved By Vacuum Preloading, prolong by carrying out being layered to change filling out to press mold ditch
Long life.
It will be understood by those skilled in the art that above to the purpose of the description of embodiments of the present invention only for illustratively
Illustrate the advantageous effect of embodiments of the present invention, be not intended to embodiments of the present invention being limited to given any show
Example.
The embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is also not necessarily limited to disclosed each embodiment.It is right in the case of without departing from the scope and spirit of illustrated each embodiment
Many modifications and changes will be apparent from for those skilled in the art.The choosing of term used herein
It selects, it is intended to best explain the principle of each embodiment, practical application or to the improvement of the technology in market or make this technology
Other those of ordinary skill in field are understood that each embodiment disclosed herein.
Claims (9)
1. a kind of vacuum prepressing ground foundation treatment method, including：
Sand bedding course is laid on former mud face, and drainage channel is laid on the sand bedding course；
Press mold ditch is dug along around the sand bedding course, and is laid with diaphragm seal；
Monitoring instrument and vacuum pump are installed, and by the vacuum pump to being evacuated ground described in precompressed in the diaphragm seal；
After pumping precompressed reaches unloading standard, vacuum preloading unloading changes and fills out the press mold ditch,
Wherein, it changes and fills out the press mold ditch and include：
The press mold ditch internal water accumulation is emptied, and removes soil layer in the press mold ditch；
Layering, which is changed, in the press mold ditch fills out flour sand and is successively compacted.
2. vacuum prepressing ground foundation treatment method according to claim 1, wherein, it is laid with the sand bedding course and includes：
It is laid with woven cloth, chaste tree fragrant plant bed course and geotextiles successively on former mud face；
It is pushed away successively in the geotextiles and fills out flour sand bed course and medium coarse sand bed course.
3. vacuum prepressing ground foundation treatment method according to claim 1, wherein, the drainage channel includes drain bar and filter
Pipe.
4. vacuum prepressing ground foundation treatment method according to claim 3, wherein, it is laid with the drainage channel and includes：
The drain bar is set to former mud bottom, the drain bar wrench is embedded to the sand bedding course；
The chimney filter is set, and is connect with the drain bar.
5. vacuum prepressing ground foundation treatment method according to claim 1, wherein, it is laid with the diaphragm seal and includes：
Membrane device is installed；
The diaphragm seal is laid with, seals the press mold ditch.
6. vacuum prepressing ground foundation treatment method according to claim 1, wherein, the number of plies of the diaphragm seal is 2-5 layers.
7. vacuum prepressing ground foundation treatment method according to claim 1, wherein, ground described in pumping precompressed includes：
Examination vacuumizes, and gas leakage is checked for by the monitoring instrument；
Ground described in formal pumping precompressed, and carry out vacuum degree record.
8. vacuum prepressing ground foundation treatment method according to claim 1, wherein, the laying area of the vacuum pump is
800m2-1200m2。
9. vacuum prepressing ground foundation treatment method according to claim 1, wherein, it further includes：In the Soft Ground Improved By Vacuum Preloading
Surrounding sets up curtain wall.
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| CN201611257399.7A CN108265697A (en) | 2016-12-30 | 2016-12-30 | Vacuum prepressing ground foundation treatment method |
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| CN111851462A (en) * | 2020-07-31 | 2020-10-30 | 中南林业科技大学 | Soft soil foundation treatment method |
| CN114960612A (en) * | 2022-06-08 | 2022-08-30 | 武汉南方旭域科技工程有限公司 | Soft soil foundation reinforcing method |
| CN118273331A (en) * | 2024-05-31 | 2024-07-02 | 中交一航局第二工程有限公司 | Soft foundation reclamation construction method |
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| CN111364439A (en) * | 2020-03-20 | 2020-07-03 | 中国一冶集团有限公司 | Novel vacuum preloading drain pipe and vacuum preloading construction method used by same |
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| CN118273331B (en) * | 2024-05-31 | 2025-02-21 | 中交一航局第二工程有限公司 | A soft foundation replacement construction method |
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Application publication date: 20180710 |