CN106836176B - The method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic - Google Patents
The method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic Download PDFInfo
- Publication number
- CN106836176B CN106836176B CN201710231070.1A CN201710231070A CN106836176B CN 106836176 B CN106836176 B CN 106836176B CN 201710231070 A CN201710231070 A CN 201710231070A CN 106836176 B CN106836176 B CN 106836176B
- Authority
- CN
- China
- Prior art keywords
- sand soil
- sand
- engineering
- building
- seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic：Processing first is sealed using the double-layer plastic diaphragm seal of geotextiles protection or the sealing structure of joint pitch back cover to sand soil building basis；It is laid in the back cover structure of bottom and vacuumizes main filter pipe-line system；Sand soil is filled, until wrapped up with geotextiles after design altitude, then with the double-layer plastic diaphragm seal sealed envelope connected with dummy seal；Grouting Pipe is installed in top layout, Grouting Pipe is drawn using membrane sealing device and temporary enclosed nozzle；Connection vaccum-pumping equipment carries out vacuumizing compression consolidation process；Top Grouting Pipe is accessed into grouting pipeline, keeps injecting slurries in building hole under vacuum state, reinforcing process assesses slip casting improved effect by monitoring and detection data.The present invention can realize application of the bad sand soil in engineering construction, solve the problems, such as that Deserts in China and sandy soil area engineering construction locality construction material lack.
Description
Technical field
The invention belongs to the fields such as civil engineering, hydraulic engineering and traffic engineering, and in particular to a kind of utilize vacuumizes skill
Art reinforces the new method of improvement sand soil.
Background technology
NW China, North, Northeast China area, including Xinjiang, the Inner Mongol, Qinghai, Ningxia, Gansu, Shaanxi, Heilungkiang,
Numerous deserts, gobi and sand ground is distributed in the ground such as Liaoning and Jilin, and component is mainly drift-sand, and drift-sand has grain
Diameter compared with it is thin and uniformly, the special engineerings property such as disproportionately graded, powder clay content is low, moisture content is low, infiltration coefficient is big, in drift-sand
Moisture scattered and disappeared in a manner of permeating downwards with surface evaporation.Due to these areas using local drift-sand as natural building and
There are above-mentioned undesirable features for filling material, and natural conditions are severe, are considered being not suitable for carrying out engineering construction project, work in the past
Journey application success example is very few.
Drift-sand is a kind of distinguishingly material formed under arid, semiarid desert climate environment as Typical Sand soil
Material and desert area is widely distributed, cheap engineering material of rich reserves, convenient material drawing.But drift-sand is loosely organized, clay
Content is low, cohesiveness is poor, stability is poor, compression property is poor, be difficult to after being rolled using conventional construction grinding compacting, low bearing capacity,
Intensity difference rolls rear amorphousness, it is difficult to long-term to keep the closely knit level after rolling.Therefore aeolian accumulation is directly utilized in desert area
The sand such as sand soil is big, of high cost as construction material development engineering construction difficulty, it is difficult to ensure construction quality.Since drift-sand is made
For the engineering characteristic of building materials itself, some ongoing projects under construction exist in construction quality, progress and cost etc.
Different degrees of problem.If current northwest China is in certain water delivery engineering built, canal dike is built using drift-sand, locality can profit
Drift-sand caking property etc. between intensity, permeability, water-retaining property, sand grains cannot meet normal filling construction requirement, sternly
Ghost image rings the normal construction of engineering.First, which is located in Xinjiang region, and drift-sand disproportionately graded is more serious, and canal dike is filled out
Construction is built mostly to carry out in the summer and autumn of high temperature drying, pave sand bed and the equal dehydration of sand bed after rolling it is very fast, it is difficult to meet most
The compacting requirement of excellent moisture content and compacting factor, filled soils are also difficult to meet design requirement, the stabilization safety and channel of canal dike
Operational safety be difficult to obtain effective guarantee；Secondly the engineering is located at high seismic intensity area, wind of the geological process to compactness difference
Sand canal dike will generate safely serious harmful effect；Again, due in filling construction the dehydration of drift-sand layer of sand it is very fast, upper layer paves
Before the lower layer sand rolled is completed apparent dehydration loose condition (of surface) is presented, cannot be satisfied transport feeding heavy duty engineering truck normal operation
It is required that causing feeding difficult, the filling construction of canal dike is seriously affected.
With Chinese society's expanding economy and the implementation of the Belt and Road and strategy to develop western regions, more and more tools
The Important Project and infrastructure project for having strategic importance and involving the interests of the state and the people include desert highway, gas pipeline, conveyance canal
During road, hydraulic structure and power transmission and transformation line are being planned and are being built, NW China, North China large oil and gas fields exploitation and
Its supporting industry engineering, West-East National Gas Transmission Project, the West-to-East Electricity Transmission Project, long range water diversion project, river improvement engineering, western part
High speed is public（Iron）Road network analysis, communication and space flight and aviation engineering are both needed to largely carry out in desert and sand soil.It looks forward to the future, in
State carries out engineering construction in desert and arid area can be more and more, and drift-sand has widely distributed, rich reserves, materials side
Just the characteristics of is the most abundant and most cheap construction material in desert and arid area, and having becomes in such regional engineering construction
The feasibility of important foundation material.Therefore it proposes that one kind can carry out the sand soil such as desert and arid area's drift-sand to reinforce to change
Good new method, to reduce difficulty of construction and promoted reinforce after the sand soil construction material such as drift-sand long-term reliability, change
It is apt to its physical characteristic, promotes its mechanical property, make it that can be well used in the engineering construction project of different characteristics.
New method will will produce good quality and benifit, economic benefit and social benefit, to serving Chinese the Belt and Road and western part
Great developing strategy implementation has great importance.But there has been no this kind of technical solutions to disclose in the prior art.Current existing skill
Various schemes in art are all difficult to meet the needs of this kind of engineering.
Invention content
Technical problems to be solved needed for the present invention are to provide a kind of native using vacuum pumping technology reinforcing sand and improve it
The method of engineering characteristic.The present invention makes full use of sand soil itself to have good infiltration breathing characteristics, by vacuumizing in sand
Property soil is internal forms negative pressure, so that sand soil is born three-dimensional equivalence pressure, sand soil is compressed under triaxial pressure effect, hole
Rate reduces, and compactness improves, and to be improved, sand soil is reinforced for intensity and bearing capacity；Simultaneously also using vacuumizing
The characteristics of slurries pouring into property in sand soil is horizontal high under technology and good fluidity further changes the sand soil after closely knit
It is good, in the case where keeping sand soil inner vacuum negative pressure state, mud or cement mortar etc. are poured into sand soil pores of the precompressed after closely knit
Gelling or curing materials, change sand shot cohesiveless soil further decrease its hole into the construction material with adhesive aggregation or gelling power
Gap rate improves its cohesive strength or gel strength, to preferably improve its compression property, further promotes its intensity and carrying
Power meets the needs of engineering construction, solves sand soil construction material in desert arid area Important Project and infrastructural project
Use problem, serve Chinese the Belt and Road and development of the West Regions development strategy.
Completing the technical solution of foregoing invention task is, a kind of to reinforce sand soil using vacuum pumping technology and improve its engineering
The method of characteristic, which is characterized in that steps are as follows：
Step 1）、2）It is that processing is sealed to its basis before being filled to sand soil building；
1）Back cover, including pitch back cover or the two layers of plastic diaphragm seal back cover for being laid with geotextiles protection are set；
2）Plastic film seal system is set：Plastic film seal system uses two membranes to be sealed to ensure sealing effect,
One layer of geotextiles are laid in two layers of plastic film sealing system, are prevented from vacuumizing sand soil particle in compacting process and are poked sealing
Film.Pitch back cover, the plastic film seal system is such as used to be connect with above-mentioned pitch dummy seal.Such as plastic seal film is used to seal
Bottom, the plastic film seal system and back cover plastic seal film are connected to become an entirety, form the large sealing film of full surface area
System；
3）After the completion of primary seals processing, pipe-line system is laid in sand soil building bottom, including lay supervisor and filter
Pipe；The pipe-line system is at the same time as sand soil building（Channel or embankment etc.）Discharge pipe line, can speed up and drain building
Infiltration in object, to promote its security performance and draining effect；
4）Sand soil is filled in the sand soil building；
5）After sand soil fills to design the elevation and the shape present situation that calculate determination, use protective layer geotextiles to it first
It is wrapped up, package is then sealed using the double-layer plastic diaphragm seal connected with dummy seal；
6）The sand soil reclamation work for reinforcing simultaneously slip casting improvement is vacuumized to that need to be carried out at the same time, design arrangement is pressed at the top of it
Salable Grouting Pipe is installed, Grouting Pipe is drawn using membrane sealing device and temporary enclosed nozzle；
7）The membrane tube that vacuumizes out for being laid in the extraction of sand soil filling body bottom is connected to vaccum-pumping equipment and carries out examination pumping
Vacuum；
It can start that sand civil engineering is built containment system and vacuumize after ensuring that sealing system is complete to compress at reinforcing
Reason；
8）Consolidation process progress is assessed according to sedimentation and compressive deformation monitoring data, compression consolidation process satisfaction is vacuumized and wants
Enter next step engineering construction after asking；
9）To still needing to the engineering of slip casting improvement, top Grouting Pipe is accessed into grouting pipeline, keeps sand soil inner vacuum shape
Slurries are injected in building hole under state, slip casting improved effect is assessed by monitoring and detection data, is entered after meeting the requirements
Next step engineering construction；
10）The connection for vacuumizing out membrane tube and vaccum-pumping equipment is removed simultaneously, to play building bottom vacuum-pumping tube
Road system is for draining the effect of building is likely to occur infiltration.
The profile of the buildings such as channel basis, canal dike or embankment of the present invention according to sand soil as filling material construction is special
Property and its primary seals condition, the sealing structure of pitch back cover is combined using plastic seal film or plastic seal film and is filled to quasi-
Sandy soil building carries out environmental sealing, and plastic seal film liner geotextiles are protected to avoid plastic seal under vacuum action
Film is punctured by the corner angle of sandy soil particle, is laid along sandy soil building bottom and is vacuumized pipe network system and draw one at spacing intervals
Set vacuumizes connecting line, can be along sandy soil if the sandy soil vacuumized after reinforcing further need to improve its characteristic using grouting mode
The slip casting preformed hole with sealing device is arranged in top of building at a certain distance.Connecting line will be vacuumized when vacuumizing reinforcing
It is connected on vaccum-pumping equipment, will be evacuated inside the sand soil structures of package using vaccum-pumping equipment, it is made to take out very
The lower porosity of sky effect becomes smaller and compression compact, to improve its intensity and bearing capacity characteristics；Vacuumize ground preloading it is closely knit after
The building that fills of sand soil when need to carry out slip casting improvement, it is closed using the Grouting Pipe for being reserved in sand soil top of building
The outer filling system being made of grouting pipeline, slip casting pond and slurries etc. of film in connection, while vaccum-pumping equipment is opened, continue to keep
It reinforces the vacuum state of sand soil building internal void after improveing and accelerates to carry out in slurries injection sand soil internal void
Filling so that sand soil particle is glued together by slurries after being solidified in sand soil internal void, pre- to vacuum to complete
The improvement of sand soil, improves its cohesive strength or gel strength after densification reality, preferably improves its compression property, further promotes it
Intensity and bearing capacity.
The method of the present invention reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, feature and work(
It can be as follows：
1）Sand soil building is sealed processing before filling to its basis, and pitch back cover can be used or be laid with geotextiles
The plastic seal film of protection.It is such as sealed using pitch back cover, first passes through reliable bonding mode by plastic seal film and pitch
Back cover surrounding is glued together, and plastic seal film temporarily putting is not then being influenced closing on for sand soil building filling construction
Region；Plastic seal film back cover is such as used, first by plastic seal film production at the big of the full surface area of sand soil building can be wrapped up
Type diaphragm seal, building based process simultaneously is completed first to be laid with counterdie part after flattening, then by the peripheral portion of plastic seal film
Temporarily putting is in the close region for not influencing sand soil building filling construction；
2）Plastic seal film thickness is 0.3~0.5mm, and tensile strength is not less than 20MPa, and elongation should be greater than 200%,
Angle tear strength should be greater than 50kN/mm, and infiltration coefficient is less than 2 × 10- 10cm/s；Plastic film seal system using two membranes into
Row sealing lays one layer of geotextiles in two layers of plastic film sealing system, prevents from vacuumizing compacting process to ensure sealing effect
Middle sand soil particle pokes diaphragm seal, and geotextiles quality is more than 60g/m2；
3）After the completion of primary seals processing, pipe-line system is laid in sand soil building bottom, including lay supervisor and filter
Pipe, pipe-line system technical characteristic index can continue to use the technical indicator of pipe-line system in vacuum preloading technology.Pipe
Road system every 20~30m pick out it is a set of go out membrane tube, go out membrane tube using membrane sealing device draw sealing system（Film）It is outer and with
Vaccum-pumping equipment connects.The pipe-line system is at the same time as sand soil building（Channel or embankment etc.）Discharge pipe line, can
Accelerate to drain the infiltration in building, to promote its security performance and draining effect；
4）Sand soil building, which fills, to be continued to use tradition and fills mode, using dumper transport, bull-dozer leveling and excavator
The construction method that slope is combined is repaiied to be filled.The reclamation level and shape present situation of building need to consider to vacuumize sand after reinforcing
The threshold limit value of sedimentation and lateral deformation caused by native building is calculated by design and determines that its initial placement elevation and shape show
Shape；
5）After sand soil fills to design the elevation and the shape present situation that calculate determination, use protective layer geotextiles to it first
It is wrapped up, package is then sealed using the double-layer plastic diaphragm seal connected with dummy seal；
6）The sand soil reclamation work for reinforcing simultaneously slip casting improvement is vacuumized to that need to be carried out at the same time, by design cloth at the top of it
The salable Grouting Pipe of installation is set, Grouting Pipe is drawn using membrane sealing device and temporary enclosed nozzle；
7）The membrane tube that vacuumizes out for being laid in the extraction of sand soil filling body bottom is connected to vaccum-pumping equipment（It vacuumizes
Jet pump or vacuum pump can be used in equipment）It carries out examination to vacuumize, examination is vacuumized to check the integrality of sealing system, is taken out by trying
Vacuum can handle the leakage problem that sealing system is likely to occur, and can start to build sand civil engineering after ensuring that sealing system is complete
Containment system carries out vacuumizing compression consolidation process；
8）Consolidation process progress is assessed according to sedimentation and compressive deformation monitoring data, compression consolidation process is vacuumized and meets
Enter next step engineering construction after it is required that；
9）To still needing to the engineering of slip casting improvement, top Grouting Pipe is accessed into grouting pipeline, keeps sand soil inner vacuum shape
Slurries are injected in building hole under state, slip casting improved effect is assessed by monitoring and detection data, is entered after meeting the requirements
Next step engineering construction；
10）The connection for vacuumizing out membrane tube and vaccum-pumping equipment is removed simultaneously, to play building bottom vacuum-pumping tube
Road system is for draining the effect of building is likely to occur infiltration.
In other words, the scheme of the invention is：Utilize the main spy for vacuumizing the new technology and method of reinforcing improvement sand soil
Point is to form negative pressure of vacuum by vacuumizing, and has good breathing characteristics by sealing and reinforcing sand soil using sand soil itself
Inside quickly forms comprehensive negative pressure state, and sandy soil is made to bear the pressure such as three-dimensional, and sand soil is compressed close under triaxial pressure effect
It is real, to solve the problems, such as that the bad sand soil such as drift-sand is difficult to grinding compacting, make northwest China, northeast and North China desert area
Engineering construction is possibly realized using local abundant sand soil as construction material, while being reduced in sand soil using vacuumizing
Slip casting difficulty and Grouting engineering expense is reduced, and further improves by slip casting the engineering characteristic of sand soil filling body, it is more preferable full
Sufficient engineering construction needs, and solves the use problem of sand soil construction material in desert area Important Project and infrastructural project,
Serve Chinese the Belt and Road and development of the West Regions development strategy.
The new method that improvement sand soil is reinforced using vacuum pumping technology proposed by the invention is by current maturation and in work
Journey widely applied in practice " soft soil foundation vacuum drainage prestressing technology " is introduced into the reinforcing and improvement work of sand soil, is continued to use
The ripe sealing technique and vacuum transfer piping that " soft soil foundation vacuum drainage prestressing technology " is formed lay technology, while fully hair
The good permeability of sand soil is waved, technique of soft soil foundation treatment superiority can be more preferably played, the reinforcing to sand soil is promoted and changes
Good effect, new technology proposed by the present invention have good economy；New technology proposed by the present invention for sand Tu Qudi and
In the construction of embankment, the plastic seal film and its sealing system of vacuum pumping technology setting can promote the roads Qu Di in engineering operation
Dike and its Foundation Anti-seepage effect, the antiseepage for improving building is horizontal, and its internal vacuum-pumping pipeline system being arranged is transported in engineering
It can be used as internal drainage pipeline in row, form good drainage system and accelerate the discharge of infiltration, to reduce in engineering operation
The risk that seepage erosion occurs, improves the level of security of engineering operation.It is proposed by the present invention be one kind to sand soil construction material
Densification and the excellent new technology and method of the efficient of improvement, economic performance index.
The model investigation that applicant team completes early period shows, due to drift-sand good permeability, to vacuumize rear vacuum
Load can transmit inside drift-sand rapidly, and drift-sand sedimentation and deformation is in the early stage in model bucket after vacuum action（In 1 day）Quickly
Develop and tend towards stability, 90% or more total settlement is completed in 1 day, vacuum load, which can be quickly converted to drift-sand stress, makes drift-sand
Compression compact, the density of drift-sand promotes 10% or more after vacuum preloading, and intensity is to greatly improve；Before applicant team
The vacuum injection consolidation process experiment display that phase completes uses vacuum injection low-dosage water soluble solid material（Curing materials are wind
The 2% of sand quality）Its intensity index of drift-sand modified body after improvement（Cohesion c）Value is increased to exceed from less than 5kPa
25kPa, and its intensity index（Angle of friction φ）It is held essentially constant.
Description of the drawings
Fig. 1 is the method construction processing single layer sand soil building schematic diagram using the present invention；
Fig. 2 is the small-sized sand soil canal for water conveyance building schematic diagram of method construction using the present invention；
Fig. 3 is that large-scale sand soil canal for water conveyance schematic diagram is built in a manner of placement in layers using the method for the present invention.
Specific implementation mode
In order to keep the objectives, technical solutions, and advantages of the present invention clearer, in conjunction with the following drawings and specific implementation case,
The method of the present invention is described in further detail.Specific implementation case described herein does not have to only to explain the present invention
It is of the invention in limiting.
Embodiment 1, sand soil building single layer embankment construction（By taking Fig. 1 as an example）
1）Filling body infrastructure and its working face are handled, when lower part is original base, it roll close
After real and leveling, back cover structure 1 is completed, pitch back cover or double-layer plastic diaphragm seal back cover can be used in back cover structure 1 at this time；Instantly
Portion is when level is completed, and back cover structure 1 uses the top plastic film seal of its underpart level；
2）Geotextiles are laid in back cover structure 1 to protect it；
3）It completes bottom vacuum-pumping pipeline system 2 to lay, including supervisor and chimney filter, pipe-line system are picked out every 20~30m
It is a set of go out membrane tube 3, go out membrane tube 3 can be used unilateral or bilateral extraction, depending on structures size；
4）The landfill that sand mound fills out body 6 is completed by design requirement building present situation and size, single layer landfill thickness is with 2
~3m is advisable；
5）Complete landfill sand mound fill out body 6 after, sand mound fill out external surface be laid with geotextiles 5 to its into
Row protection, geotextiles play the protective effect to overlying plastic diaphragm seal 4 simultaneously, prevent from vacuumizing sand soil in compacting process
Grain stamp slope diaphragm seal；
6）Face seal double-layer plastic diaphragm seal 4 is connected and sealed with dummy seal structure 1, tenses and wraps up
Being covered in lay protects the sand mound of geotextiles 5 to fill out external surface, and diaphragm seal 4 all connectors in outer surface use bonding mode
It is sealed；
7）When subsequently needing to carry out slip casting improvement to vacuum densification sand soil building, filled out in the sand mound sealed
The suitable position of body surface face diaphragm seal 4 draws membrane slip casting connecting tube 7, and slip casting connecting tube is provided with control valve；
8）Membrane tube 3 will be vacuumized out and connect vaccum-pumping equipment, the leakproofness that sand mound fills out body is looked by trying sampling observation, it is right
Existing seal defect is repaired, and is started formally to fill out body to sand mound in the case where ensuring good seal and is vacuumized
Ground compacting according to monitoring and testing result assessment consolidation effect and determines the reinforcing deadline；
9）To the sand soil building engineering entity for needing slip casting to improve, slip casting connecting tube 7 is connected on filling system,
It opens slip casting and connects tube control flap, while continuing on vaccum-pumping equipment, keep sand soil internal real under vacuum state
It applies and its slip casting is improved, institute's injection slurry material is determined by design, is changed according to monitoring and testing result assessment improved effect and determination
The good construction deadline.
10）Membrane tube 3 will be vacuumized out and the connection of vaccum-pumping equipment removes, make building bottom vacuum-pumping pipeline system can
The infiltration being likely to occur for draining building.
Embodiment 2, small-sized sand soil canal for water conveyance construction（By taking Fig. 2 as an example）
1）Implementation steps are not both that sand mound is filled out and embodies the difference of shape with embodiment 1, in embodiment 1 with embodiment 1
Sand mound, which is filled out body tunneling boring and synchronized, to be risen, and sand mound fills out body respectively by canal base plinth, canal dike subregion landfill in embodiment 2.
Embodiment 3, large-scale sand soil canal for water conveyance construction（By taking Fig. 3 as an example）
By 1 step 1 of embodiment）~10）It is respectively completed channel basal layer 8 and the layering of canal dike the 9th, 10,11,12 ... is applied
Work is stopped until levee body fills design altitude.
Claims (9)
1. a kind of method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, which is characterized in that steps are as follows：
Step 1）、2）It is that processing is sealed to its basis before being filled to sand soil building；
1）Back cover, including pitch back cover or the two layers of plastic diaphragm seal back cover for being laid with geotextiles protection are set；
2）Plastic film seal system is set：Plastic film seal system uses two membranes to be sealed to ensure sealing effect, two
One layer of geotextiles are laid in layer plastic film seal system, prevents from vacuumizing sand soil particle in compacting process and pokes diaphragm seal；It adopts
When with pitch back cover, which connect with above-mentioned pitch dummy seal；It, should when using plastic seal film back cover
Plastic film seal system and back cover plastic seal film are connected to become an entirety, form the large sealing membranous system of full surface area；
3）After the completion of primary seals processing, pipe-line system is laid in sand soil building bottom, including lay supervisor and chimney filter；It should
Pipe-line system discharge pipe line as sand soil building simultaneously；
4）Sand soil is filled in the sand soil building；
5）After sand soil fills to design the elevation and the shape present situation that calculate determination, it is wrapped with protective layer geotextiles first
It wraps up in, package is then sealed using the double-layer plastic diaphragm seal connected with dummy seal；
6）The sand soil reclamation work for reinforcing simultaneously slip casting improvement is vacuumized to that need to be carried out at the same time, is installed by design arrangement at the top of it
Grouting Pipe is sealed, Grouting Pipe is drawn using membrane sealing device and temporary enclosed nozzle；
7）By be laid in sand soil filling body bottom extraction vacuumize out membrane tube be connected to vaccum-pumping equipment carry out examination vacuumize；
Start to build containment system to sand civil engineering after ensuring that sealing system is complete and carries out vacuumizing compression consolidation process；
8）According to sedimentation and compressive deformation monitoring data assess consolidation process progress, vacuumize compression consolidation process meet the requirements after
Into next step engineering construction；
9）To still needing to the engineering of slip casting improvement, top Grouting Pipe is accessed into grouting pipeline, is kept under sand soil inner vacuum state
Slurries are injected in building hole, slip casting improved effect is assessed by monitoring and detection data, are entered after meeting the requirements next
Walk engineering construction；
10）The connection for vacuumizing out membrane tube and vaccum-pumping equipment is removed simultaneously, to play building bottom vacuum-pumping pipeline system
System is for draining building infiltration.
2. the method according to claim 1 reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, special
Sign is, step 2）The plastics film thickness is 0.3~0.5mm, and tensile strength is not less than 20MPa, and elongation is more than
200%, angle tear strength is more than 50kN/mm, and infiltration coefficient is less than 2 × 10- 10cm/s；The quality of the geotextiles is more than
60g/m2。
3. the method according to claim 1 reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, special
Sign is, step 1）、2）The encapsulation process first passes through bonding mode plastics are close when being sealed using pitch back cover
Sealer is glued together with pitch back cover surrounding, then fills plastic seal film temporarily putting not influencing sand soil building
The close region of construction；It is first that plastic seal film production is complete at that can wrap up sand soil building when using plastic seal film back cover
The large sealing film of surface area, building based process simultaneously is completed first to be laid with counterdie part after flattening, then by plastic seal film
Peripheral portion temporarily putting in the close region for not influencing sand soil building filling construction.
4. the method according to claim 1 reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, special
Sign is, step 3）The technical characteristic index of the pipe-line system continues to use pipeline system in vacuum preloading technology
The technical indicator of system；Pipe-line system every 20~30m pick out it is a set of go out membrane tube, go out membrane tube using membrane sealing device draw sealing
System is outer and is connect with vaccum-pumping equipment.
5. the method according to claim 1 reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, special
Sign is, step 4）Described fills sand soil, is flattened using dumper transport, bull-dozer and what excavation machine maintenance slope was combined applies
Work method is filled.
6. the method according to claim 1 reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, special
Sign is, step 4）Described fills sand soil, and reclamation level and shape present situation need to consider that sand civil engineering is built after vacuumizing reinforcing
The threshold limit value of sedimentation and lateral deformation caused by object, is calculated by design and determines its initial placement elevation and shape present situation.
7. the method according to claim 1 reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, special
Sign is, step 4）Described fills sand soil, after sand soil fills to design the elevation and the shape present situation that calculate determination, first
It is wrapped up with protective layer geotextiles, packet is then sealed using the double-layer plastic diaphragm seal connected with dummy seal
It wraps up in.
8. the method according to claim 1 reinforced sand soil using vacuum pumping technology and improve its engineering characteristic, special
Sign is,
Step 4）Described fills sand soil, and the single layer landfill thickness that sand mound fills out body layer is advisable with 2~3m.
9. reinforcing sand soil using vacuum pumping technology and improveing the side of its engineering characteristic according to one of claim 1-8
Method, which is characterized in that step 7）The vaccum-pumping equipment uses jet pump or vacuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710231070.1A CN106836176B (en) | 2017-04-11 | 2017-04-11 | The method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710231070.1A CN106836176B (en) | 2017-04-11 | 2017-04-11 | The method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106836176A CN106836176A (en) | 2017-06-13 |
| CN106836176B true CN106836176B (en) | 2018-09-14 |
Family
ID=59147317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710231070.1A Active CN106836176B (en) | 2017-04-11 | 2017-04-11 | The method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106836176B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107439196A (en) * | 2017-08-30 | 2017-12-08 | 中国冶集团有限公司 | Slip casting type deep layer sandy soil plantation band synthesis improvement method |
| CN107724364B (en) * | 2017-09-19 | 2019-12-03 | 无锡交通建设工程集团有限公司 | A kind of construction technology of soft soil foundation |
| CN108360323B (en) * | 2018-03-16 | 2020-04-10 | 宁波工程学院 | Prefabricated assembly roadbed with solid waste and poor soil solidified and packaged into block |
| CN111501507B (en) * | 2020-05-22 | 2021-04-27 | 招商局重庆交通科研设计院有限公司 | Rapid permeation reinforcement repair technology for asphalt pavement surface layer deterioration |
| CN111945497A (en) * | 2020-06-22 | 2020-11-17 | 中南大学 | Concrete structure pore filling operation device and method |
| CN114960599A (en) * | 2022-05-23 | 2022-08-30 | 青岛理工大学 | Functional granule bag for vacuum compression engineering, forming method and application thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3064935B2 (en) * | 1996-12-16 | 2000-07-12 | 株式会社大林組 | Improvement method of core material for fill dam |
| CN102605760B (en) * | 2012-04-12 | 2014-10-22 | 席宁中 | Method and device of vacuum in-situ consolidation of large-area urban domestic sludge |
| CN104343111A (en) * | 2014-09-28 | 2015-02-11 | 山东科技大学 | Composite foundation for reinforcing thick sand soil layer by using node piles |
| CN106284293A (en) * | 2016-08-08 | 2017-01-04 | 中交上航局航道建设有限公司 | A kind of system and method for vacuum pre-pressed joint electric osmose reinforcing soft ground |
-
2017
- 2017-04-11 CN CN201710231070.1A patent/CN106836176B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106836176A (en) | 2017-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106836176B (en) | The method reinforced sand soil using vacuum pumping technology and improve its engineering characteristic | |
| CN106840086B (en) | Quick consolidation soft soil test device of ultralow position vacuum preloading method | |
| CN103031836B (en) | A kind of method of building road on new hydraulically filled sludge ground fast | |
| CN104120710B (en) | A kind of highway on soft ground method of vacuum pre-pressed joint serous fluid of dredger fill | |
| CN101265701A (en) | Soft soil foundation reinforcing means | |
| CN104652413B (en) | A kind of new mudflat sludge Roadbed Treatment | |
| CN102733371A (en) | Closed direct-sucking sectional vacuum preloading foundation treatment method | |
| CN103696416B (en) | A kind of method for processing foundation | |
| CN111733792A (en) | Foundation treatment method and system for soft soil foundation vacuum preloading and power consolidation drainage | |
| CN107178077A (en) | Overburden layer grouting and reinforcing structure and its design method on a kind of karst area solution cavity | |
| CN106884427A (en) | Immersed tube tunnel and immersed tube tunnel changeover portion soft soil foundation reinforcing method under water | |
| CN105369797A (en) | Vacuum radiation solidification method for collapsible loess | |
| CN110485405B (en) | Reinforcing system and reinforcing method for soft soil foundation | |
| CN103774516A (en) | Subbase course stabilizing treatment method for soft foundation excavation roadbed | |
| CN212452584U (en) | Foundation treatment system combining vacuum preloading of soft soil foundation with power consolidation drainage | |
| CN101761098B (en) | Embedding method of surveying slant and settling tube | |
| CN107034873B (en) | Foundation treatment method combining lateral extrusion and vacuum multidirectional preloading | |
| CN204982857U (en) | Three -dimensional multichannel drainage combination tamping unit of low level negative pressure | |
| CN114293596A (en) | Vertical seepage-proofing process for large garbage mountain | |
| CN208088278U (en) | A kind of piling prepressing treatment of soft foundation structure | |
| CN202148522U (en) | Soft soil foundation long concrete short gravel (LCSG) pile and vacuum preloading joint treatment device | |
| Guo et al. | Theoretical calculation method of open-loop pressure for sleeve-valve pipe grouting and engineering verification | |
| CN207904912U (en) | Band expands shoe stake side two-step-filling construction of prefabricated piles structure | |
| CN204875831U (en) | Top layer soil solidifies on spot and closes foundation structure that bears with pile cluster | |
| CN103397627A (en) | Improved causeway water overlaying preloading method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: He Ning Inventor after: He Bin Inventor after: Wang Guoli Inventor after: Li Denghua Inventor after: Zhang Zhongliu Inventor after: Li Dongbing Inventor after: Huang Zhoucheng Inventor after: Mei Jufu Inventor after: Zhang Xian Inventor after: Liu Zhongyi Inventor after: Wang Zhangchun Inventor after: Ma Guizhen Inventor after: Zhou Yanzhang Inventor after: Qian Yajun Inventor after: Yao Mingshuai Inventor after: Zhang Guirong Inventor after: Xu Binhua Inventor after: Jiang Yanbin Inventor before: He Ning Inventor before: Li Denghua Inventor before: Wang Zhangchun Inventor before: Zhang Zhongliu Inventor before: Li Dongbing Inventor before: Huang Zhoucheng Inventor before: Mei Jufu Inventor before: Zhang Xian Inventor before: Fang Tao Inventor before: Liu Zhongyi Inventor before: Wu Lulu Inventor before: Zhou Yanzhang Inventor before: Zhang Jiasheng Inventor before: Qian Yajun Inventor before: Yao Mingshuai Inventor before: Zhang Guirong Inventor before: Xu Binhua Inventor before: Jiang Yanbin Inventor before: He Bin Inventor before: Wang Guoli |