CN101736735A - Composite reinforcing method for combining soft foundation light well point pipe with plastic drainage plate - Google Patents
Composite reinforcing method for combining soft foundation light well point pipe with plastic drainage plate Download PDFInfo
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Abstract
The invention relates to a composite power reinforcing method for combining a soft foundation light well point pipe with a plastic drainage plate. The method comprises the following process steps of: excavating a drainage ditch; distributing light well plastic drainage well points and carrying out vacuum pumping; striking a light well point pipe, a plastic drainage plate and a peripheral seal pipe and distributing the light well plastic drainage well points on a soft foundation needing treatment, wherein the plastic drainage plate has a mechanical inserting method and a water-washing hole formation inserting method, in the mechanical inserting method, the plastic drainage plate with needed depth is inserted by adopting a plate inserting machine, after an inserting pipe of the plate inserting machine is drawn, the light well point pipe is immediately inserted into a jack of the plastic drainage plate, and the terminal of the plastic drainage plate is pressed into the ground surface below 0.5m, a sand filter material is placed into the jack to fill with the distance of 0.45-0.55m from an opening of the jack, and then the opening of the jack is tightly sealed by clay; mounting water dropping equipment; pumping vacuum for dewatering; finishing dewatering; and solidifying by power. The method can reduce the water content of a soil body of a sludge interlayer.
Description
(1) technical field
The present invention relates to a kind of soft-soil foundation treatment method, relate in particular to a kind of large-area soft ground and handle and adopt the compound well point of light well point pipe jointing plastic draining board (hereinafter to be referred as reinforcement means light well plastic strip well point).Be applicable to that new hydraulic reclamation mud content is higher and have the soft foundation of interburden layer dark, shallow-layer handles.Possession base processing technology field.
(2) background technology
At present, along with the fast development of coastal area, the method for utilizing beach and reclamation by pumping filling is to solve the industrial land deficiency.For the processing of this type of soil property, can use " vacuum method " and handle, but this method (generally needing more than three months) long in time limit.Particularly work as the higher or sand folder mud of barged-in fill sand content, and the place of irregular skerry is arranged, take the method for vacuum preloading then can produce gas leakage, promptly negative pressure is low, therefore causes the precompressed effect undesirable.
When the barged-in fill sand content higher, or sand folder mud, and the place of irregular skerry arranged, for improving the bearing capacity of soft foundation, method commonly used at present has reduction to need the water content of the processing region soil body promptly to adopt the method for precipitation, for example carry out methods such as big open drain precipitation, vacuum-dewatering, light well point precipitation and electroosmosis dewatering at the need processing region, the method in conjunction with strong rammer, vibroroller cmpacting or impact-rolling makes it to reach rapidly solidified then.In fact only can form one so-called " crust layer " by above these processing methods in ground top layer 4～6m scope, and the ground of handling by said method is to carrying out drill sampling below the 6m, δ and ω value are measured in layering, with the stratum δ before the processing, the contrast of ω value, the basic variation not quite.This is because the required optimum moisture content of the strong rammer of soft foundation is to depend on big open drain precipitation, methods such as vacuum-dewatering, light well point precipitation and electroosmosis dewatering realize, and these methods make precipitation depth to reach below the 6m owing to be subjected to the restriction (as the length of well point pipe) of equipment and the vacuum restriction of pulsating pump.Simultaneously, well-points dewatering is because its filter is provided with general all at 0.5～1.0m place, steel pipe bottom, when sludge interlayer during on filter top, well point, because the transmission coefficient of sludge interlayer is little, therefore adopt well-points dewatering to have certain limitation, can't carry out effective precipitation to the above soil body of sludge interlayer, form water trapping layer, make that needing to reinforce soil property can't reach the required optimum moisture content of strong rammer, therefore rammer back effect is unsatisfactory, even produces the phenomenon of " spring soil ".Particularly in the dewatering construction process of mucky soil, because its transmission coefficient is little, that excess pore water pressure after strong the rammer dissipates is slow (resolution time needs a wheat harvesting period even six months), make the strong worker of rammer of combinations such as big open drain precipitation, vacuum-dewatering, light well point precipitation and electroosmosis dewatering method be difficult to reach the desirable effect and the desirable degree of depth, therefore be difficult to satisfy the demand that the soft foundation deep layer is reinforced.
In order to solve the sludge interlayer of new barged-in fill, in construction, adopt first injection plastic draining board, when underground water after the band drain passage of inserting overflows ground, take the method for artificial drainage forced-ventilated, after top layer underground water is got rid of, carry out dynamic consolidation construction.In fact the uncontrollable soil mass consolidation that needs of this method rams required optimum moisture content by force, the same phenomenon that produces " spring soil ".In view of the above, in work progress, after inserting band drain, be aided with vacuum well-point dewatering (light well point precipitation), by this method, reach quick reduction and need reinforcing area soil body water content, ram by force then or dynamic consolidation, but in work progress, but produce: because the plastic draining board termination bassets, when pulling out the well point pipe and ram by force, because tamping energy is to the shock effect of substratum, a large amount of underground water is by the plastic draining board face of land that gushes out, making dynamic reinforcement equipment can't continue construction, trace it to its cause, is because vacuum well-point dewatering can't reduce the water content of the sludge interlayer soil body, after ramming, Free water in most of sludge interlayer is overflowed by the passage of plastic draining board, and the place mire can't reach the requirement that ruggedized equipment enters.
(3) summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, a kind of combining soft foundation light well point pipe with plastic drainage plate composite reinforcing method that can reduce sludge interlayer soil body water content is provided.
The object of the present invention is achieved like this: a kind of combining soft foundation light well point pipe with plastic drainage plate composite reinforcing method is characterized in that described method comprises following processing step:
The compound well point that step 2, layout light well point pipe jointing plastic draining board form also vacuumizes compound well-points dewatering
A, injection light well plastic strip well point and peripheral tube sealing
The soft foundation that need are handled is arranged light well plastic strip well point, the well point spacing is 4.0 * 4.0m, plastic draining board the insertion method have two kinds: a kind of is mechanical insertion, be applicable to below the reinforcement depth 6.0m, promptly adopt board-plugging device to insert the plastic draining board of desired depth, after the intubate of board-plugging device is extracted, in being inserted with the jack of plastic draining board, insert the light well point pipe immediately, and the plastic draining board termination is pressed into below the 0.5m of the face of land, light well point pipe when inserting the light well point pipe in described jack, drop into sand filtering material between plastic draining board and the jack hole wall and fill out filling in fact, sand filtering material is filled to apart from jack aperture 0.45～0.55m, then that the jack aperture is tight with the clay packing, another kind is that water is washed into the hole insertion, be applicable to more than the reinforcement depth 6.0m, utilize the light well point pipe directly plastic draining board to be inserted, its method is: earlier plastic draining board is pressed Len req and cut off, one termination of plastic draining board with rope with the plastic draining board letter jail of turning back, light well point pipe and plastic draining board are inserted in the hole simultaneously, after water is washed into the hole, in light well point pipe and plastic draining board patchhole, another termination of plastic draining board is pressed into below the 0.5m of the face of land, and the light well point pipe in described hole, drop into sand filtering material between plastic draining board and the jack hole wall and fill out filling in fact, sand filtering material is filled to apart from jack aperture 0.45～0.55m, then that the jack aperture is tight with the clay packing
B, precipitation apparatus are installed
Arrange according to light well plastic strip well point pipe, lay the water header position, during laying, discharge water header earlier, bury light well plastic strip well point underground with mechanical insertion or water jetting again, with arm the light well point pipe is connected with water header then, vacuum pump is installed at last, the light well point pipe is embedded in the center of water punching
C, vacuumize precipitation, vacuum degree control-0.06～-0.08MPa, first pass vacuumized water discharge time 7～10 days, vacuumized water discharge time for second time 7～10 days, determine according to ramming back soil body excess pore water pressure resolution time two times blanking times, be generally between 7～15 days, in practice of construction, can determine according to the soil condition test.
D, precipitation finish
Control index after the light well plastic strip well-points dewatering is: the optimum moisture content error is 3%～5% behind the precipitation, and groundwater table is controlled to be and is stabilized in below the 3m of the face of land, when observed result meets the control index request, carries out the next process construction;
Step 3, dynamic consolidation
After soil body water content reaches design and dynamic consolidation construction necessary requirement, pull out the light well point pipe in the light well plastic strip well point, lay strong tamping point in the soft foundation zone of need consolidation process and carry out first pass point rammer, first pass point rams by 4.5m square layout (or can layout according to the designing requirement of geology conditioned disjunction), the rammer pusher is flat, arrange light well plastic strip well point second time, method is arranged with first pass, carry out the well-points dewatering of second time light well plastic strip, in drawdown below 3m or during designing requirement, then dial the light well point pipe that removes in the light well plastic strip, carrying out second time point rams, second time point rams also layouts by the 4.5m square, and be quincuncial arrangement (or layout according to geological condition and designing requirement) with the first pass tamping point, carry out precipitation so many time and ram by force, reach required bearing capacity, through the well-points dewatering of the light well plastic strip of many wheels, take turns a little more ram after, last rams all over full, all over can carry out next 90% or more all over constructing all over the super quiet pore pressure dissipation of control in the dynamic consolidation construction process; After full rammer finishes, treat more than the pore pressure dissipation to 90%, can enter road, treatment of the earth construction.
In practice of construction, also can not pull out the light well point pipe in the light well plastic strip well point, and tamping point is designed between described adjacent two row's light well point pipes, after treating that the first round rams, connect this light well point pipe immediately, carry out the well-points dewatering of second time light well plastic strip, in drawdown below 3m or during designing requirement, then dial the light well point pipe that removes in the light well plastic strip, carry out second time point and ram, so manyly ram by force all over carrying out precipitation, reach required bearing capacity, through the well-points dewatering of the light well plastic strip of many wheels, take turns a little more ram after, last rams all over full, all over can carry out next 90% or more all over constructing all over the super quiet pore pressure dissipation of control in the dynamic consolidation construction process; After full rammer finishes, treat more than the pore pressure dissipation to 90%, can enter road, treatment of the earth construction.
Use this technology, can guarantee that the reinforcing of soft foundation reaches designing requirement, again can be by light well plastic strip well point control reinforcement depth.Simultaneously by the method for light well plastic strip well point in conjunction with dynamic consolidation, super quiet pore pressure water behind the rammer can dissipate fast by the plastic draining board rising and through the well-points dewatering of the light well plastic strip of next round, because vertical effect of plastic draining board makes the transmission of the rammer energy degree of depth, make the strong degree of depth that influences of ramming deepen, thereby make soft foundation reach the required bearing capacity of designing requirement.This method construction safety coefficient is big, the duration short.The deep layer that is specially adapted to soft foundation is reinforced needs.
Because the degree of depth that plastic draining board inserts can be extended according to designing requirement, simultaneously, therefore power capacity can make present technique reach the effect of deep level of processing by plastic draining board to the depth transmission again, reaches shallow-layer, the deep layer purpose of consolidation process simultaneously.
Present technique is according to different geological conditionss and different processing requirements, by adjusting spacing, the degree of depth of the plastic draining board in the precipitation process, when inserting the light well point pipe, insert plastic draining board, formed the vertical drain of light well point and plastic draining board, the insertion depth of general light well point pipe is 6m, and the degree of depth of the plastic draining board that inserts simultaneously with the light well point pipe then can be extended according to the degree of depth of required reinforcing or designing requirement reach desired depth.Light well point pipe connecting branch, arm connect water header, water header connects vacuum pump and carries out precipitation, make the soft foundation water content reach the required optimum moisture contents of dynamic reinforcement such as strong rammer or vibroroller cmpacting, pull out the light well point pipe and carry out the dynamic reinforcement processing.In the dynamic reinforcement process, because the plastic draining board that inserts is retained in the soil body, ram densification and percussion that the subject of knowledge and the object of knowledge produces during dynamic reinforcement, make the water of compaction in the soil body discharge the face of land fast by plastic draining board, quick precipitation has been created condition for following time; Secondly the excess pore water pressure that produces in the dynamic reinforcement process dissipates by plastic draining board again, fast for fastly fastening flexible ground is laid a good foundation; Secondly be exactly that energy vertically is delivered to certain degree of depth by plastic draining board in the dynamic reinforcement process again, reached the purpose that deep layer is reinforced.Because the following place of face of land 0.5m is inserted in the plastic draining board termination, therefore, when adopting dynamic compaction to construct, insert the plastic draining board termination face of land under with ramming and continue to be pressed under the face of land, solved the excessive situation of sludge interlayer Free water to the face of land.Processing by present technique can solve the root problem that the soft foundation deep layer is reinforced, and can solve the difficulty that the excess pore water pressure of soft foundation behind dynamic consolidation is difficult for dissipation again; The soft foundation that need are handled can reach deeply according to designing requirement and geological conditions, shallow-layer is handled simultaneously, and made treatment of soft foundation fast controllable.This worker method construction safety coefficient is big, the duration short, and soft foundation after treatment influences the degree of depth and can reach about 20m.
This worker method following advantage arranged:
1, short construction period, cost performance height: method for processing foundation is compared because the soft foundation that utilizes plastic draining board and light well point pipe in same position need to be handled carries out the effect of direct precipitation reinforcing, short construction period a little less than this construction technology and the traditional soft; Simultaneously, owing to transmit kinetic energy through the plastic draining board deep layer, the deep layer strengthening quality improves, and makes soft foundation be fit to the needs of different designs fast, and its cost performance improves greatly.
2, be not subjected to the restriction of soft foundation geological conditions, can adjust the length of plastic draining board as required, by adjustment make it to be fit to differently the to verify demand of different bearer power of ground, thereby provide effective guarantee for the depth layer consolidation process of irregular interburden layer soft foundation.
3, need strengthening soft foundation after light well plastic strip well-points dewatering, reaching dynamic consolidation in soil body water content takes, carry out dynamic consolidation and handle (as strong rammer), under the certain direct percussion of energy to the soil body, Free water and part water of hydration are converged because of the existence that plastic draining board forms drainage channel in the soil body, and along plastic draining board and be seeped into 0.5m position under the face of land, but do not overflow the face of land; Thereby make intermediate water that drain passage arranged, for next round precipitation has been created condition.
4, overcome conventional light well point precipitation and can't set up drainage channel, therefore be difficult to reduce interlayer silt soil body water content, solved vacuum well-point dewatering and rammed powerless even do not reach design effect by force such soil property because of the restriction of well point pipe filter.The drainage channel of plastic draining board self is in conjunction with the vacuum dehydration of light well point, makes treated soil body water content equilibrium; Intersect light well plastic strip precipitation in conjunction with multipass dynamic consolidation construction technology by many wheels, lay a good foundation for the soft base of large tracts of land improves bearing capacity.
5, in construction, can be according to different geological conditionss and different transmission coefficients in conjunction with multiple dewatering construction technology, adjust as electroosmosis dewatering, vacuum-dewatering and deep layer electric osmose well point pipe, shallow-layer vacuum well point pipe, also can adjust simultaneously, to obtain different precipitation requirements by electroosmosis dewatering time, vacuum-dewatering time.
(4) description of drawings
Fig. 1 is the light well plastic strip of a present invention well point layout plan.
Fig. 2 is a light well plastic strip of the present invention well point deep structure schematic diagram.
Fig. 3 is a light well plastic strip of the present invention well point shallow structure schematic diagram.
Fig. 4 is a light well plastic strip of the present invention well point facade simplified schematic diagram.
(5) specific embodiment
The concrete processing step of this worker method following (dynamic consolidation is an example with strong rammer):
Large-area soft foundation is taked light well plastic strip well-points dewatering reinforcing technique, then the need reinforcing area can be provided with some sub-districts, a general sub-district is 5000～10000m
2Take to excavate the open drain between sub-district and the sub-district, connect mutually between the open drain of sub-district and sub-district, form drainage network, the junction, open drain is provided with the collecting well of some, and the method that the open drain hydromining is taken from stream or forced-ventilated is discharged in the contiguous river course.
The compound well point (being called for short light well plastic strip well point) that step 2, layout light well point pipe jointing plastic draining board form also vacuumizes compound well-points dewatering
A, injection light well plastic strip well point and peripheral tube sealing
The soft foundation that need are handled is arranged light well plastic strip well point according to designing requirement and geological condition, and the well point spacing is 4.0 * 4.0m, as Fig. 1.The degree of depth that the length of plastic draining board is handled according to need determines, plastic draining board the insertion method have two kinds:
A kind of is mechanical insertion (reinforcement depth 6.0m is following):
Board-plugging device promptly commonly used inserts the plastic draining board of desired depth, after the intubate of board-plugging device is extracted, in being inserted with the jack of plastic draining board, insert the light well point pipe immediately, for guaranteeing dewatering effect, light well point pipe when inserting the light well point pipe in described jack, drop into sand filtering material between plastic draining board and the jack hole wall and fill out filling in fact, and the plastic draining board termination is pressed into below the 0.5m of the face of land, sand filtering material is filled to apart from about the 0.5m of jack aperture, then the face of land exposed because of the plastic draining board termination with the clay packing during tight in case light well point precipitation in the jack aperture and produce gas leakage, as Fig. 3.
Another kind is that water is washed into hole insertion (more than the reinforcement depth 6.0m):
Because required shallow layer reinforcement, therefore can utilize the light well point pipe directly plastic draining board to be inserted fully, its method is: earlier plastic draining board is pressed certain-length and cut off, turn back plastic draining board with rope in one termination of plastic draining board, make light well point pipe and plastic draining board insert in the hole simultaneously (accompanying drawing 2), after water is washed into the hole, in light well point pipe and plastic draining board patchhole, form light well plastic strip well point, another termination of plastic draining board is pressed into below the 0.5m of the face of land, and the light well point pipe in described hole, drop into sand filtering material between plastic draining board and the jack hole wall and fill out filling in fact, and the plastic draining board termination is pressed into below the 0.5m of the face of land, sand filtering material is filled to apart from about the 0.5m of jack aperture, and is then that the jack aperture is tight with the clay packing.
B, precipitation apparatus are installed
Layout according to light well plastic strip well point, lay the water header position, during laying, discharge water header earlier, bury light well point pipe and plastic draining board underground with mechanical insertion or water jetting again, with arm the light well point pipe is connected with water header then, pumping equipments such as vacuum pump and equalizer are installed at last.The light well point pipe should be embedded in the center of water punching, avoids inserting and stops up chimney filter in the mud.Water header to water plug will maintain 3%～5% the gradient, as Fig. 4.
C, vacuumize precipitation, vacuum should be controlled at-0.06～-0.08MPa between, should be not less than-0.04MPa.First pass vacuumized water discharge time 7～10 days, vacuumized water discharge time for second time 7～10 days, determine according to ramming back soil body excess pore water pressure resolution time two times blanking times, be generally between 7～15 days, in practice of construction, can determine according to the soil condition test.In the practice of construction as the case may be (soil moisture content, on-the-spot draining total amount, dropdown curve etc.) suitably adjust.
D, precipitation finish
Control index after the light well plastic strip well-points dewatering is: the optimum moisture content allowable error is 3%～5% behind the precipitation, and groundwater table is controlled to be and is stabilized in below the 3m of the face of land.When observed result meets the control index request, can carry out the next process construction.
Step 3, dynamic consolidation (is example with strong rammer)
After soil body water content reaches design and dynamic consolidation construction necessary requirement, pull out the light well point pipe in the light well plastic strip well point, lay strong tamping point in the soft foundation zone of need consolidation process and carry out first pass point rammer, first pass point rams by 4.5m square layout (or can layout according to the designing requirement of geology conditioned disjunction), the rammer pusher is flat, arrange light well plastic strip well point second time, method is arranged with first pass, carry out the well-points dewatering of second time light well plastic strip, in drawdown below 3m or during designing requirement, then dial the light well point pipe that removes in the light well plastic strip, carrying out second time point rams, second time point rams also layouts by the 4.5m square, and be quincuncial arrangement (or layout according to geological condition and designing requirement) with the first pass tamping point, so manyly ram by force, reach required bearing capacity all over carrying out precipitation, through the well-points dewatering of the light well plastic strip of many wheels, take turns a little more ram after, last rams all over full, fullly rams construction not leak rammer, do not dig into effect obvious.Also can adjust according to design or examination rammer situation.The strong ceasing driving standard that rams to be ramming number, and last continuous two ramming volumes that hit are not more than 10cm and control.
Hammer ram in the construction hangs height and presses the calculating of column count formula:
Sling height H value is: H=M/T+h+a-b
Wherein:
M---energy is rammed in design
T---hammer is heavy
H---the hammer ram Heave Here is to the height of putting the flat side of a hammer
A---parameter more than needed gets 0.2;
B---1/2 design crater depth gets 0.75.
Dynamic compaction machinery mainly adopts crawler crane, and according to the standby auxiliary mast of on-site actual situations.
According to the reinforcing soft foundation requirement, the soft foundation that can handle need as stated above carries out the multipass consolidation process, make it the requirement for bearing capacity that reaches required, all over all over noticing in the dynamic consolidation construction process that super quiet pore pressure dissipation can carry out next all over constructing 90% or more; Take turns through more and to carry out last after a little ramming and ram all over full.Should keep peripheral tube in construction period continues precipitation and finishes to pull out peripheral well point pipe until last all over strong the rammer.
After full rammer finishes, treat more than the pore pressure dissipation to 90%, can enter road, treatment of the earth construction.
Dynamic consolidation also can adopt construction technologies such as vibroroller cmpacting or impact-rolling.
Claims (2)
1. the light well plastic strip of soft foundation well-points dewatering is characterized in that in conjunction with the dynamic reinforcement technology described method comprises following processing step:
Step 1, excavation gutter
Step 2, the light well plastic strip well point of layout also vacuumize compound well-points dewatering
A, injection light well plastic strip well point and peripheral tube sealing
The soft foundation that need are handled is arranged light well plastic strip well point, the well point spacing is 4.0 * 4.0m, plastic draining board the insertion method have two kinds: a kind of is mechanical insertion, be applicable to below the reinforcement depth 6.0m, promptly adopt board-plugging device to insert the plastic draining board of desired depth, after the intubate of board-plugging device is extracted, in being inserted with the jack of plastic draining board, insert the light well point pipe immediately, and the plastic draining board termination is pressed into below the 0.5m of the face of land, light well point pipe when inserting the light well point pipe in described jack, drop into sand filtering material between plastic draining board and the jack hole wall and fill out filling in fact, sand filtering material is filled to apart from jack aperture 0.45～0.55m, then that the jack aperture is tight with the clay packing, another kind is that water is washed into the hole insertion, be applicable to more than the reinforcement depth 6.0m, utilize the light well point pipe directly plastic draining board to be inserted, its method is: earlier plastic draining board is pressed certain-length and cut off, one termination of plastic draining board with rope with the plastic draining board letter jail of turning back, light well point pipe and plastic draining board are inserted in the hole simultaneously, after water is washed into the hole, in light well point pipe and plastic draining board patchhole, another termination of plastic draining board is pressed into below the 0.5m of the face of land, and the light well point pipe in described hole, drop into sand filtering material between plastic draining board and the jack hole wall and fill out filling in fact, sand filtering material is filled to apart from jack aperture 0.45～0.55m, then that the jack aperture is tight with the clay packing
B, precipitation apparatus are installed
Arrange according to the light well point pipe, lay the water header position, during laying, discharge water header earlier, bury light well plastic strip well point underground with mechanical insertion or water jetting again and sew, with arm the light well point pipe is connected with water header then, vacuum pump is installed at last, the light well point pipe is embedded in the center of water punching
C, vacuumize precipitation, vacuum degree control-0.06～-0.08MPa, first pass vacuumized water discharge time 7～10 days, vacuumized water discharge time 7～10 days second time, two times 7～15 days blanking times of two times blanking times,
D, precipitation finish
Control index after the compound well-points dewatering that light well point pipe jointing plastic draining board forms is: the optimum moisture content error is 3%～5% behind the precipitation, groundwater table is controlled to be and is stabilized in below the 3m of the face of land, when observed result meets the control index request, carry out the next process construction;
Step 3, dynamic consolidation
After soil body water content reaches design and dynamic consolidation construction necessary requirement, pull out the light well point pipe in the light well plastic strip well point, lay strong tamping point in the soft foundation zone of need consolidation process and carry out first pass point rammer, the rammer pusher is flat, arrange light well plastic strip well point second time, method is arranged with first pass, carry out the well-points dewatering of second time light well plastic strip, in drawdown below 3m or during designing requirement, then dial the light well point pipe that removes in the light well plastic strip, carrying out second time point rams, carry out precipitation so many time and ram by force, reach required bearing capacity, through the well-points dewatering of the light well plastic strip of many wheels, take turns a little more ram after, last rams all over full, all over can carry out next 90% or more all over constructing all over the super quiet pore pressure dissipation of control in the dynamic consolidation construction process; After full rammer finishes, treat more than the pore pressure dissipation to 90%, can enter road, the treatment of the earth construction, in practice of construction, also can not pull out the light well point pipe in the light well plastic strip well point, and tamping point is designed between described adjacent two row's light well point pipes, after treating that the first round rams, connect this light well point pipe immediately, carry out the well-points dewatering of second time light well plastic strip, below 3m or during designing requirement, then dial the light well point pipe that removes in the light well plastic strip in drawdown, carrying out second time point rams, carry out precipitation so many time and ram by force, reach required bearing capacity, through the well-points dewatering of the light well plastic strip of many wheels, take turns a little more ram after, last rams all over full, all over can carry out next 90% or more all over constructing all over the super quiet pore pressure dissipation of control in the dynamic consolidation construction process; After full rammer finishes, treat more than the pore pressure dissipation to 90%, can enter road, treatment of the earth construction,
Described light well plastic strip well point is meant the compound well point that light well point pipe jointing plastic draining board forms.
2. the well-points dewatering of the light well plastic strip of a kind of soft foundation according to claim 1 is in conjunction with the dynamic reinforcement method, it is characterized in that hammer ram in the described construction hangs height and presses the column count formula and calculate:
Sling height H value is: H=M/T+h+a-b
Wherein:
M---energy is rammed in design
T---hammer is heavy
H---the hammer ram Heave Here is to the height of putting the flat side of a hammer
A---parameter more than needed gets 0.2;
B---1/2 design crater depth gets 0.75.
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