CN107130580A - New independent well point integrate draining combined vacuum ground preloading method and hardened system - Google Patents
New independent well point integrate draining combined vacuum ground preloading method and hardened system Download PDFInfo
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- CN107130580A CN107130580A CN201710351782.7A CN201710351782A CN107130580A CN 107130580 A CN107130580 A CN 107130580A CN 201710351782 A CN201710351782 A CN 201710351782A CN 107130580 A CN107130580 A CN 107130580A
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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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Abstract
The invention discloses the new independent well point integrate draining combined vacuum ground preloading method of one kind and hardened system, including selection land-based area, vacuum preloading scope is set；Deploy to ensure effective monitoring and control of illegal activities each independent well point and well point interoceptor；Installing submersible pump and air-extractor；Arrange horizontal drain pipe and drain bar；Hermetic barrier：Carry out vacuum preloading, vacuum well-point dewatering and complete the unloading after reinforcing.The beneficial effects of the invention are as follows：Each independent well point and drain bar are organically combined into " linker " using the pervious bed in soil layer, it regard independent well point integrate draining system as the main integrate draining body of deep soil, it is evacuated respectively and drainage works by two sets of separate systems, deep phreatic water in ground is pooled in well point and discharged outside ground, traditional vacuum precompressed is fundamentally solved due to the problem of deep soil consolidation effect is not good caused by defective workmanship, shorten the duration while enhancing consolidation effect, economize on resources and cost, environmental protection and economy.
Description
Technical field
The present invention relates to civil engineering groundwork and the soft foundation processing technology field on basis, more particularly to a kind of new independent well
Point integrate draining combined vacuum ground preloading method and hardened system.
Background technology
At present, vacuum preloading method has been developing progressively as a ripe foundation reinforcement method.For what is naturally occurred
For soft soil foundation, vacuum preloading has the effect of highly significant.But for reclaimed ground recently, especially deep hydraulic reclamation
Soil, traditional vacuum precompressed is often difficult to the underground water of deep layer being effectively discharged out.Because in the later stage of vacuum preloading, due to ground
In water section be discharged, remaining water can not form solid stream of water in draw water pipeline under vacuum, therefore row
Often there is a part of water in water plate and drinking-water pipe can not extract out, still there is the water do not discharged in deep soil.Pore water pressure
Presence reduce the intergranular effective stress of the soil body, this will cause vacuum pre-press reinforcing effect to be given a discount greatly in deep soil
Button, and ground after reinforcing is usually that surface strength is high and not good " crust layer " effect of deep-layer reinforcing effect.Research has shown that,
Soil body residual settlement occurs mostly in deep soil after vacuum preloading, therefore, if can discharge this part water, it will from basic
After upper solution vacuum preloading the problem of deep reclaimed ground validity period residual settlement, validity period is reduced caused by settlement of foundation
Maintenance cost.Simultaneously in ground occluded water presence, have a strong impact on the stability of later stage deep pit digging.
The corrective measure of prior art has aqueous vapor separation method etc..Aqueous vapor separation method, is to utilize a terminal (aqueous vapor
Separator) will be evacuated and draw water is carried out respectively with two systems, and the energy that pumping expends is relatively low but is able to maintain that vacuum preloading
Required vacuum, and just carried out only when the water in terminal reaches to a certain degree when drawing water.Due in deep soil
Water can not be discharged by the method, therefore the above method has primarily served the effect for saving the energy, but not solved fundamentally
The certainly hydropexis problem in deep soil.
For reduction deep phreatic water, well-point dewatering method is a kind of ripe technology, by setting well point in ground, is made
Free water in ground is pooled among well point under gravity, and well-points dewatering funnel is formed in foundation soil.With well
In water be constantly extracted, the water around well is pooled in well step by step, and level of ground water declines therewith.With the row of underground water
Go out, therefore the effective stress increase between grogs, foundation soil is reinforced.
According to the operation principle of well-points dewatering, there is good dewatering effect particularly with deep phreatic water, it is pre- in vacuum
The defect that well-points dewatering will can overcome the disadvantages that traditional vacuum pre-pressing process is introduced in pressure, therefore attempts vacuum pre-pressed joint well-points dewatering
Reinforcement means, such as uses light well point, with same set of evacuation system, is applied simultaneously into foundation soil by well point and drain bar
Plus vacuum action.It is the same in the vacuum and drain bar in well point, well point now is only just corresponded in this way
The larger drain bar of water-flowing amount, it is substantially little with traditional vacuum precompressed difference.Due to only being created in theory
Attempted in new and construction, do not analyse in depth and study the reinforcement mechanism of vacuum pre-pressed joint well-points dewatering and specific behaviour
Make method, therefore can not fundamentally solve the defective workmanship of vacuum preloading, it is impossible to significantly increase consolidation effect.Therefore, arrive
So far, effect is reinforced in the reinforcement means of the vacuum pre-pressed joint well-points dewatering also progress of not making a breakthrough property, Practical Project
Fruit is than vacuum preloading without being remarkably reinforced.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of vacuum preloading based on independent well point collection, drainage system
Joint well-points dewatering reinforcing mode, is separated into two sets of separate work systems, fully profit by well point pumping and drainage system
Drain bar and well point are combined into " linker " with natural pervious bed in soil, the underground water collected in well point is taken out by immersible pump
Go out outside well, the effective stress in increase soil strengthens foundation stabilization effect.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of new independent well point integrate draining connection
Vacuum pre-press reinforcing method is closed, it is characterized in that, including step is as follows：
Step one, land-based area is selected, vacuum preloading scope is set；Step 2, using pros in the land-based area that step one is selected
Shape or triangle projective planum arrange multiple independent well points, and well point bottom is squeezed into or punched in pervious bed；Set multiple parallel with well point
Drain bar, and drain bar at the top of be connected with horizontal collector pipe；Shallow-layer, deep layer priming inductor and stopping are set on the borehole wall
Three groups of inductors of inductor, control the unlatching of immersible pump, stop；Step 3, installing submersible pump and air-extractor：Each well point bottom
Place two immersible pumps in portion；Connect exhaust tube and be evacuated pumping plant with integrated form, when integrated form pumping pumping plant starts pumping, vacuum
Effect will be applied in well point；Step 4, arranges horizontal drain pipe：Horizontal collector pipe is arranged at the top of foundation soil, according to row
The position of water plate is laid and reticulated, and when having sand bedding course at the top of foundation soil, horizontal collector pipe is embedded in sand bedding course, and connects water
Flat collector pipe and drain bar；Step 5, hermetic barrier：Diaphragm seal is laid, by the top pressure closure and well point top pallet with soil
Work cloth and diaphragm seal should be covered；In stabilization zone, surrounding arranges impervious clay curtain wall, and press mold trench depth should be met：(1) it is right
In the harder soil body, press mold ditch is 2.5~3m deep；(2) for the softer soil body, press mold ditch is 1~2m deep；Step 6, is opened
Vaccum-pumping equipment carries out vacuum preloading, and pumping process runs through whole reinforcing process, stops pumping after unloading standard until reaching, takes out
Ensure that pressure-reduction level maintains -80~-95kPa during gas；
Step 7, carries out vacuum well-point dewatering：Immersible pump is automatically turned on stopping in the Precipitation Process of well point；Step 8,
When foundation strength reaches that the continuous five days Tested settlement speed of unloading standard (1) is less than 1.5~4mm/d, (2) soil solidifying degree reaches
After 85%~90%, stop pumping, complete to reinforce.
Multiple independent well points of the step 2, spacing R is 50m~100m.
The drain bar of the step 2, when soil layer middle-shallow layer contains potential pervious bed (silt, silty sand ground etc.), punches this
Pervious bed.
Squeeze into or punch permeable layer depth 2~3m deep more than drain bar bottom in the step 2, well point bottom.
The immersible pump of the step 3 efficiency Q that draws water should be met：
In formula, Q is the displacement of immersible pump in the unit time, and unit is m3/s；K is the infiltration system of pervious bed in ground
Number, unit is m/s；H is pervious bed thickness, unit m；R is the arrangement spacing of each well point, unit m；H is water level, unit in well point
m；Hv is the corresponding height of vacuum, unit m in well point；H is thoroughly pervious bed bottom water level height, unit m；L is the outer water of ground
Source is to the horizontal range of immersible pump, unit m.
A kind of reinforcing system for the new independent well point integrate draining combined vacuum ground preloading method realized described in claim 1
System, including：Integrated form pumping pumping plant, exhaust tube, drinking-water pipe, multiple independent well points, from top to bottom positioned at multiple independent well points
Pervious bed in geotextiles seal film layer, soft foundation soil layer and ground, the independent well point is provided with and surrounds the telescopic of well top
The borehole wall and the permeable borehole wall of the macropore of bottom, well top pressure closure, top pallet, the retaining wall yellow ground filtering layer of borehole wall periphery, the independence
Well point well inner aqueous layer provided with sensing buoy, be sequentially provided with the borehole wall shallow-layer draw water priming inductor, deep layer draw water start feeling should
Device and the stopping inductor that draws water, bottom are provided with immersible pump, and bottom water layer, the other end are goed deep into described in described drinking-water pipe one end
Top pressure closure stretches out, and the exhaust tube is located at outside top pressure closure through described top pressure closure one end is evacuated pumping plant phase with integrated form
Connection, the other end are located at lower end in top pressure closure；Horizontal collector pipe is arranged on above the soft foundation soil layer, level connection institute
State the borehole wall of independent well point；The soft foundation soil layer is provided with multiple drain bars parallel with the independent well point, described parallel
Drain bar top connected with the horizontal collector pipe, the parallel drain bar bottom is squeezed into ground in pervious bed；It is described
The telescopic a length of 1~4m of the borehole wall, the aperture D of the permeable borehole wall of macropore is equal to macropore permeable well casing footpath d and twice of thickness of filter bed r
Sum.
The soft foundation soil layer is 30cm~50cm provided with sand bedding course thickness.
Geotextiles diaphragm seal is provided between the borehole wall periphery and retaining wall yellow ground filtering layer.
Plane where the shallow-layer priming inductor is located at the 3~4m depths started at by original ground, and the deep layer is opened
Plane where dynamic inductor is located at 2~3m higher than drain bar bottom, and the stopping inductor at the top of immersible pump with flushing.
The independent well point collection, the land-based area stabilization zone of drainage system formation are surrounded by impervious clay curtain wall；It is described to stretch
A length of 1~the 4m of the contracting formula borehole wall, the aperture D of the permeable borehole wall of macropore be equal to the permeable well casing footpath d of macropore and twice thickness of filter bed r it
With.
The beneficial effects of the invention are as follows：The pervious bed in soil layer is made full use of to organically combine each independent well point and drain bar
Into " linker ", collection, displacement hull by the use of independent well point collection, drainage system as deep soil mainly are mutually only by two sets
Vertical system is evacuated and drainage works respectively, and the deep phreatic water in ground is pooled in well point and discharged outside ground, from
Traditional vacuum precompressed is fundamentally solved because the problem of deep soil consolidation effect is not good caused by defective workmanship, effect is reinforced in enhancing
Play a part of saving energy while fruit, shorten the duration；Drainage blanket in ground is organic by well-point system and drain bar system
" linker " is combined into, each drain bar is turned into several " small well points ", can more effectively improve water collection efficiency, allow more
Underground water is pooled in well point under the effect of well point.(reach after certain water level), lead to after the water in well is gathered to a certain extent
The startup and stopping of induction system automatic controlled submersible pump are crossed, intermittently, on one's own initiative the water in well point is pumped out outside ground, made
Well point funneling effect constantly acts on underground water, energy-conservation and efficiently improves water outlet efficiency, has effect in increase ground
Power, so that ground can be reinforced effectively by shallow-layer to deep layer, shortens the duration, economizes on resources and cost, environmental protection and economy.
Brief description of the drawings
Fig. 1 is independent well point elevational schematic view of the invention,
Fig. 2 is independent well point integrate draining combined vacuum ground preloading system elevational schematic view of the invention,
Fig. 3 is independent well point integrate draining combined vacuum ground preloading System planes schematic diagram of the invention.
Wherein：
1st, geotextiles diaphragm seal 2, sand bedding course 3, exhaust tube
4th, drinking-water pipe 5, sealing valve 6, top pressure closure
7th, well point top pallet 8, horizontal collector pipe 9, drain bar
10th, the original soil body or working cushion layer surface 11, the telescopic borehole wall 12, borehole wall jointing
13rd, retaining wall yellow ground filtering layer 14, wrap up in the permeable boreholes wall of macropore of geotextiles outside
15th, soft foundation soil layer 16, shallow-layer draw water priming inductor
17th, deep layer draw water priming inductor 18, Groundwater bit line 19, sensing buoy
20th, draw water stopping inductor 21, water 22, immersible pump
23rd, pervious bed 24, independent well point in ground
25th, potential aqueous pervious bed in impervious clay curtain wall 26, ground
27th, integrated form pumping pumping plant 28, distribution box
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
As shown in Figure 1 to Figure 3, a kind of hardened system of new independent well point integrate draining combined vacuum ground preloading method,
Including：Distribution box 28, integrated form pumping pumping plant 27, exhaust tube 3, drinking-water pipe 4, multiple independent well points 24, from top to bottom be located at it is many
Pervious bed 23 in the geotextiles seal film layer of individual independent well point 24, soft foundation soil layer 15 and ground, the independent well point 24 is set
Have the telescopic borehole wall 11 for surrounding well top and the permeable borehole wall 14 of the macropore of bottom, well top pressure closure 6, top pallet 7, outside the borehole wall
The retaining wall yellow ground filtering layer 13 in week, the independent well point well inner aqueous layer is sequentially provided with shallow-layer on the borehole wall and taken out provided with sensing buoy 19
Water priming inductor 16, deep layer draw water priming inductor 17 and draw water stopping inductor 20, bottom be provided with immersible pump 22, it is described
The one end of drinking-water pipe 4 is goed deep into bottom water layer, the other end and stretched out in the top pressure closure 6, and the exhaust tube 3 is pushed up through the sealing
The one end of lid 6 is positioned at the outside of top pressure closure 6 is connected with integrated form pumping pumping plant 27, the other end is located at lower end in top pressure closure 6；Water
Flat collector pipe 8 is arranged on above the soft foundation soil layer 15, and level connects the borehole wall upper end of the independent well point 24；It is described soft
Weak foundation soil 15 is provided with multiple drain bars 9 parallel with the independent well point 24, and the parallel top of drain bar 9 is provided with company
Connect device to connect with the horizontal collector pipe 8, the parallel bottom of drain bar 9 is squeezed into ground in pervious bed 23.
A kind of new independent well point integrate draining combined vacuum ground preloading method, including step one, select land-based area, and setting is true
Empty precompressed scope；Step 2, sets independent well point collection, drainage system and drain bar, using just in the land-based area that step one is selected
Square or triangle projective planum arranges multiple independent well points；Its top of multiple drain bars parallel with well point is connected with horizontal collector pipe
Connect, bottom is squeezed into pervious bed 23, together constituted " linker " in pervious bed and well point；Shallow-layer, deep layer is set to open on the borehole wall
Dynamic inductor and stopping three groups of inductors of inductor, control the unlatching of immersible pump, stop；Step 3, installing submersible pump and pumping
Equipment：Two immersible pumps are placed in each well point bottom, and a preparation and a use, the lift of immersible pump 22 should be more than 35m；Connection pumping
Pipe is evacuated pumping plant with integrated form, and when integrated form pumping pumping plant starts pumping, vacuum action will be applied in well point；Step
Four, arrange horizontal drain pipe：Horizontal collector pipe is laid according to the position of drain bar to be reticulated, and has sand bedding course at the top of foundation soil
When, horizontal collector pipe is directly connected with drain bar；Step 5, hermetic barrier：Diaphragm seal is laid, the pumping except reserving well point
Outside pipe, the outlet of well point drinking-water pipe, the top pressure closure and well point top pallet should be covered with geotextiles and diaphragm seal,
When well point needs to safeguard, after diaphragm seal and geotextiles are removed, open the top pressure closure and carry out well point maintenance；In stabilization zone four
Week arranges impervious clay curtain wall, and press mold trench depth should be met：(1) for the harder soil body, press mold ditch is 2.5~3m deep；
(2) for the softer soil body, press mold ditch is 1~2m deep；Step 6, opens vaccum-pumping equipment and carries out vacuum preloading, pumping process
Through whole reinforcing process, pumping is just stopped after unloading standard until reaching, completes to reinforce, ensures that pressure-reduction level is maintained during pumping
In -80~-95kPa；Step 7, carries out vacuum well-point dewatering：Immersible pump is automatically turned on stopping in the Precipitation Process of well point；Step
Rapid eight, when foundation strength reaches that the continuous five days Tested settlement speed of unloading standard (1) is less than 1.5~4mm/d, (2) soil solidifying
Spend up to after 85%~90%, stop pumping, complete to reinforce.
The thickness of step one medium coarse sand bed course 2 should be 30cm~50cm；Also it can use without sand method vacuum preloading, secondary precompressed
All it is applicable Deng, every vacuum preloading scope.
In step 2, well point bottom should be squeezed into pervious bed 23, or is punched pervious bed 23 and entered pervious bed subsoil
In body, the deep 2~3m in the bottom of drain bar 9 that its depth at least should be set than after.When in soil layer contain the shallower (powder of pervious bed 26
Soil, silty sand ground etc.) when, well point should punch the pervious bed.
The horizontal layout of well point 24 should be determined using square or triangle, spacing R according to live bailing test.For warp
The consideration of Ji property, well point number should not be excessive, therefore spacing R is unsuitable too small, between preferably 50m~100m.
The single structure of independent well point 24 is by top pressure closure 6, top pallet 7, retaining wall yellow ground filtering layer 13, the and of the telescopic borehole wall 11
The permeable borehole wall 14 of macropore is constituted, as shown in Figure 1.Top pallet 7 and top pressure closure 6 are integrally fixed, and prevent the flexible borehole wall 11 from sinking
Enter in soft foundation.Top pressure closure 6 is mainly used in sealing well point, will form vacuum in well after pumping.Well point top 1
Shaft wall design, can be as the soil body sinks together when the top layer soil body is settled to be telescopic in the range of~4m.The permeable borehole wall of macropore
14 have water penetration, can effectively collect the underground water of surrounding.Connected between each section borehole wall by joint 12, so can be by well
Point is attached in deeper soil.Wrapped up on the outside of the borehole wall with geotextiles, and with the retaining wall of yellow ground filtering layer 13, can play permeable anti-native
Effect.
When installing the permeable borehole wall 14 of well point macropore, first in specified location drilling, aperture D should be equal to the permeable well casing footpath d of macropore
With twice of thickness r sum of filtering layer 13, i.e. D=d+2r.After pore-forming is finished, the thick yellow ground of 5~10cm first is inserted in bottom hole, then will
The permeable borehole wall 14 of macropore that permeable geotextiles are wrapped is put into hole between two parties, then yellow ground is inserted into borehole wall surrounding is used as filtering layer.
Drain bar 9 is plastic material, and design is carried out by related specifications, and its top is connected with horizontal collector pipe 8.Drain bar
9 bottoms are squeezed into pervious bed 23, are together made up of " linker " pervious bed 23 and well point.
When soil layer middle-shallow layer contains potential pervious bed 26 (silt, silty sand ground etc.), drain bar 9 should punch the pervious bed
26.Potential pervious bed 26 can improve water collection efficiency, and more effectively the underground water of shallow-layer is pooled in well point.
In order to realize the automatic start of immersible pump 22 and stopping in pump process, three groups of inductors 16,17 are set on the borehole wall
With 20, while placing sensing buoy 19 in well.Wherein, shallow-layer priming inductor 16 and deep layer priming inductor 17 are used to control
The unlatching of immersible pump, stops the stopping that inductor 20 is used to control immersible pump.The purpose for setting two groups of priming inductors is, plus
Gu initial stage, level of ground water is higher, ground water yield is big, and the priming inductor 16 for setting depth shallower can reduce turn on pump frequency,
Economize on resources.The later stage is reinforced, level of ground water is relatively low, set deep layer priming inductor 17 more effectively to extract deeper subsurface
Water.
At the initial stage of reinforcing to mid-term, Groundwater bit line 18 is located in soil at shallower position, when water level is higher in well point 24,
Using shallow-layer well point draw water priming inductor 16 control immersible pump unlatching.When water level rises to and shallow-layer priming inductor in well point
16 it is equally high when, sensing buoy 19 and the mutual induction of priming inductor 16 and make immersible pump 22 open, immersible pump 22 starts active
Ground is extracted out outside ground by the underground water collected in well point.When the water level in well point is down to stopping the grade height of inductor 20, sense
Answer buoy 19 to stop immersible pump 22 with stopping the mutual induction of inductor 20, pump process pause, underground water in well point after
Continuous accumulation, until sensing buoy 19 is risen at shallow-layer priming inductor 16 with water level, immersible pump 22 is again turned on and taken out
Water.So move in circles, up to the reclaimed water potential drop of well point 24 to relatively low position.
Reinforcing the intermediary and later stages, Groundwater bit line 18 is located in soil at deep place, and water level, which is reduced to, in well point 24 compares
During low level, the unlatching of immersible pump is controlled using the deep layer well point priming inductor 17 that draws water.When water level rises to and deep in well point
When layer priming inductor 17 is equally high, sensing buoy 19 and the mutual induction of priming inductor 17 and make immersible pump 22 open, diving
Pump 22 starts on one's own initiative to extract the underground water collected in well point outside ground out.When the water level in well point is down to stopping inductor
20 etc. it is high when, sensing buoy 19 stops immersible pump 22 with stopping the mutual induction of inductor 20, and pump process is suspended, in well point
Underground water continue gather, until sensing buoy 19 risen to water level at deep layer priming inductor 17, immersible pump 22 is opened again
Open and drawn water.So move in circles, until reinforcing engineering terminates.
In step 3, after well point construction is finished, two immersible pumps 22, a preparation and a use are placed in each well point bottom.It is latent
The lift of water pump 22 should be more than 35m, under vacuum conditions still can active, efficiently draining with guarantee.Immersible pump 22 passes through
The outlet pipe 4 on a piece extraction ground extracts water out from well, and outlet pipe 4 loads onto water check valve 5 after drawing earth's surface.
The immersible pump 22 of the selection efficiency Q that draws water should meet condition：
In formula, Q is the displacement of immersible pump 22 in the unit time, and unit is m3/s；K is the infiltration of pervious bed 23 in ground
Coefficient, unit is m/s；H is the thickness of pervious bed 23, unit m；R is the arrangement spacing of each well point 24, unit m；H is well point reclaimed water
Position, unit m；Hv is the corresponding height of vacuum, unit m in well point；H is thoroughly the bottom water level of pervious bed 23 height, unit m；L is
The outer water source of ground is to the horizontal range of immersible pump 22, unit m.When the drainage efficiency Q of immersible pump meets above formula, external water source stream
The reinforcing of ground will not just be completely interfered with by entering the water in ground, effectively discharge the underground in ground by immersible pump 22.
If being unsatisfactory for above-mentioned condition, the water that immersible pump 22 is extracted out is entirely to be flowed into by external water source via pervious bed 23 in well point,
Water in ground is remained in ground, and the purpose of reinforcing is not reached completely.
In addition, drawing an exhaust tube 3 from well point top, it is connected with integrated form pumping pumping plant 27.When integrated form pumping
When pumping plant 27 starts pumping, vacuum action will be applied in well point.
Horizontal collector pipe 8 in step 4 should be laid according to the position of drain bar to be reticulated, its burial place be divided into
Lower two kinds of situations consider：
(1) when having sand bedding course 2 at the top of foundation soil, horizontal collector pipe 4 is embedded in sand bedding course 2；
(2) when at the top of foundation soil without sand bedding course 2, horizontal collector pipe 4 is directly connected with drain bar.
The effect of horizontal collector pipe is to link together the top of drain bar 9 with the top of well point 24, thus that ground is shallow
The underground water of layer is collected in well point 24 by drain bar 9 by top.In addition, in the later stage of reinforcing, the top of drain bar 9 and well point
24 tops are connected, and drain bar 9 is combined formation " linker " with well point 24.
In step 5, when paving geotextiles and diaphragm seal 1, in addition to reserving the exhaust tube 3 of well point and exporting, it should also reserve
The outlet of well point drinking-water pipe 4, while ensureing that exit good seal is air tight.Geotextiles and diaphragm seal should be by the top pressure closures 6
Covered with well point top pallet 7.When well point needs to safeguard, after diaphragm seal and geotextiles are removed, the sealing can be opened
Top cover 6 carries out well point maintenance.
Stabilization zone surrounding should arrange impervious clay curtain wall 25, and press mold trench depth should meet following requirement：
(1) for the harder soil body, press mold ditch should accomplish that 2.5~3m is deep；
(2) for the softer soil body, press mold ditch should accomplish 1.5m or so.
In step 6, after all preparations are carried out, start pumping.Integrated form pumping pumping plant 27 is opened, into ground
Applying vacuum load.Pumping process runs through whole reinforcing process, and pumping is just stopped after unloading standard until reaching.Wherein, it is evacuated
When ensure that pressure-reduction level maintains -80~-95kPa.
In step 7, immersible pump 22 is automatically turned on stopping in the Precipitation Process of well point, is opened by sensing buoy 19, shallow-layer
Dynamic inductor 16, deep layer priming inductor 17 and stopping inductor 20 are realized.
At the initial stage of reinforcing to mid-term, when water level rises to high as shallow-layer priming inductor 16 in well point, buoy is sensed
19 make immersible pump 22 open with the mutual induction of shallow-layer priming inductor 16, and immersible pump 22 starts in well point to collect on one's own initiative
Underground water is extracted out outside ground.When the water level in well point is down to stopping the grade height of inductor 20, sensing buoy 19 is felt with stopping
Answer the mutual induction of device 20 and stop immersible pump 22, pump process is suspended, the underground water in well point continues to gather, until sensing is floated
Mark 19 is risen at shallow-layer priming inductor 16 with water level, and immersible pump 22 is again turned on and drawn water.So move in circles, directly
Reduced levels are down to water level.
Mid-term is being reinforced to the later stage, when water level rises to high as deep layer priming inductor 17 in well point, buoy is being sensed
19 make immersible pump 22 open with the mutual induction of deep layer priming inductor 17, and immersible pump 22 starts in well point to collect on one's own initiative
Underground water is extracted out outside ground.When the water level in well point is down to stopping the grade height of inductor 20, sensing buoy 19 is felt with stopping
Answer the mutual induction of device 20 and stop immersible pump 22, pump process is suspended, the underground water in well point continues to gather, until sensing is floated
Mark 19 is risen at deep layer priming inductor 17 with water level, and immersible pump 22 is again turned on and drawn water.So move in circles, directly
Terminate to reinforcing engineering.
It is preferred that, the place plane of shallow-layer priming inductor 16 is located at the 3~4m depths started at by original ground, and deep layer is opened
The dynamic place plane of inductor 17 is located at 2~3m higher than drain bar bottom, is stopped inductor 20 and is flushed with the top of immersible pump 22.
In step 8, when reinforcing proceeds to following degree, illustrate that foundation strength has met bearing requirements, can stop adding
Gu process：
(1) continuous five days Tested settlement speed is less than 1.5~4mm/d；
(2) soil solidifying degree is up to 85%~90%.
Index value of the present invention and non-limitative illustration, can be according to actual conditions and related rule only as recommended value
Model is suitably adjusted.In every case equivalent modification or change are done according to present invention and application range, should all belongs to this hair
The bright content covered.
Claims (10)
1. a kind of new independent well point integrate draining combined vacuum ground preloading method, it is characterized in that, including step is as follows：
Step one, land-based area is selected, vacuum preloading scope is set；
Step 2, multiple independent well points, well point bottom are arranged in the land-based area that step one is selected using square or triangle projective planum
Portion squeezes into or punched in pervious bed；Set and be connected at the top of multiple drain bars parallel with well point, and drain bar with horizontal collector pipe
It is logical；Shallow-layer, deep layer priming inductor are set on the borehole wall and stop three groups of inductors of inductor, the unlatching of immersible pump is controlled, stops
Only；
Step 3, installing submersible pump and air-extractor：Place two immersible pumps in each well point bottom；Connect exhaust tube with it is integrated
Formula is evacuated pumping plant, and when integrated form pumping pumping plant starts pumping, vacuum action will be applied in well point；
Step 4, arranges horizontal drain pipe：Horizontal collector pipe is arranged at the top of foundation soil, and networking is laid according to the position of drain bar
Shape, when having sand bedding course at the top of foundation soil, horizontal collector pipe is embedded in sand bedding course, and connected level set water pipe and drain bar；
Step 5, hermetic barrier：Diaphragm seal is laid, should with geotextiles and diaphragm seal by the top pressure closure and well point top pallet
Cover；In stabilization zone, surrounding arranges impervious clay curtain wall, and press mold trench depth should be met：(1) for the harder soil body, pressure
Film ditch is 2.5~3m deep；(2) for the softer soil body, press mold ditch is 1~2m deep；
Step 6, opens vaccum-pumping equipment and carries out vacuum preloading, pumping process runs through whole reinforcing process, until reaching unloading mark
Stop pumping after standard, ensure that pressure-reduction level maintains -80~-95kPa during pumping；
Step 7, carries out vacuum well-point dewatering：Immersible pump is automatically turned on stopping in the Precipitation Process of well point；
Step 8, when foundation strength reaches that the continuous five days Tested settlement speed of unloading standard (1) is less than 1.5~4mm/d, (2) soil
The body degree of consolidation stops pumping up to after 85%~90%, completes to reinforce.
2. the new independent well point integrate draining combined vacuum ground preloading method of one kind according to claim 1, it is characterized in that,
Multiple independent well points of the step 2, spacing R is 50m~100m.
3. the new independent well point integrate draining combined vacuum ground preloading method of one kind according to claim 1, it is characterized in that,
The drain bar of the step 2, when soil layer middle-shallow layer contains potential pervious bed, punches the pervious bed.
4. the new independent well point integrate draining combined vacuum ground preloading method of one kind according to claim 1, it is characterized in that,
Squeeze into or punch permeable layer depth 2~3m deep more than drain bar bottom in the step 2, well point bottom.
5. the new independent well point integrate draining combined vacuum ground preloading method of one kind according to claim 1, it is characterized in that,
The immersible pump of the step 3 efficiency Q that draws water should be met：
In formula, Q is the displacement of immersible pump in the unit time, and unit is m3/s；K is the infiltration coefficient of pervious bed in ground, single
Position is m/s；H is pervious bed thickness, unit m；R is the arrangement spacing of each well point, unit m；H is water level, unit m in well point；Hv
For the corresponding height of vacuum in well point, unit m；H is thoroughly pervious bed bottom water level height, unit m；L is that the outer water source of ground is arrived
The horizontal range of immersible pump, unit m.
6. a kind of reinforcing system for the new independent well point integrate draining combined vacuum ground preloading method realized described in claim 1
System, including：Integrated form pumping pumping plant (27), exhaust tube (3), drinking-water pipe (4), multiple independent well points (24), from top to bottom it is located at
Pervious bed (23), the independence in the geotextiles seal film layers of multiple independent well points (24), soft foundation soil layer (15) and ground
Well point (24) be provided with the telescopic borehole wall (11) and the permeable borehole wall of macropore (14) of bottom that surround well top, well top pressure closure (6),
Top pallet (7), the retaining wall yellow ground filtering layer (13) of borehole wall periphery, it is characterized in that：
The independent well point well inner aqueous layer is sequentially provided with shallow-layer provided with sensing buoy (19), on the borehole wall and drawn water priming inductor
(16), deep layer draw water priming inductor (17) and draw water stopping inductor (20), bottom be provided with immersible pump (22), it is described to draw water
Pipe (4) one end is goed deep into bottom water layer, the other end and stretched out in the top pressure closure (6), and the exhaust tube (3) passes through the sealing
Top cover (6) one end is positioned at top pressure closure (6) outside is connected with integrated form pumping pumping plant (27), the other end is located at top pressure closure
(6) interior lower end；
Horizontal collector pipe (8) is arranged on the soft foundation soil layer (15) above, and level connects the well of the independent well point (24)
Wall；
The soft foundation soil layer (15) is provided with multiple drain bars (9) parallel with the independent well point (24), described parallel
Drain bar (9) top is connected with the horizontal collector pipe (8), and pervious bed in ground is squeezed into described parallel drain bar (9) bottom
(23) in.
7. the hardened system of new independent well point integrate draining combined vacuum ground preloading method according to claim 6, its
It is characterized in：The soft foundation soil layer (15) is provided with sand bedding course (2), and thickness is 30cm~50cm.
8. a kind of reinforcing system of new independent well point integrate draining combined vacuum ground preloading method according to claim 6
System, it is characterized in that：Geotextiles diaphragm seal (1) is provided between the borehole wall periphery and retaining wall yellow ground filtering layer (13).
9. a kind of reinforcing system of new independent well point integrate draining combined vacuum ground preloading method according to claim 6
System, it is characterized in that：Plane where the shallow-layer priming inductor (16) is located at the 3~4m depths started at by original ground, institute
Plane where stating deep layer priming inductor (17) is located at 2~3m higher than drain bar bottom, and the stopping inductor (20) is with diving
Flushed at the top of water pump (22).
10. a kind of new independent well point integrate draining combined vacuum ground preloading method according to any one of claim 6 to 9
Hardened system, it is characterized in that：The independent well point collection, the land-based area stabilization zone of drainage system formation are surrounded by impervious clay curtain
Curtain wall (25)；A length of 1~the 4m of the telescopic borehole wall (11), the aperture D of the permeable borehole wall of macropore (14) is permeable equal to macropore
Well casing footpath d and twice of filtering layer (13) thickness r sum.
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