CN107587511A - For preventing and administering the long-short pile ruggedized construction and reinforcement means of foundation ditch bottom heave - Google Patents
For preventing and administering the long-short pile ruggedized construction and reinforcement means of foundation ditch bottom heave Download PDFInfo
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Abstract
The present invention provides a kind of long-short pile ruggedized construction and reinforcement means for being used to preventing and administering foundation ditch bottom heave.Methods described is applied to the foundation ditch that depth is no more than 5m, and its bottom of foundation ditch has weak substratum.Methods described carries out the reinforcing of basement weak subjacent bed using short stakes with the spaced apart mode of long piling bar, and short stakes reinforce first layer weak substratum, and long piling bar reinforces remaining one or more layers weak substratum；The fully-inserted Foundation Pit bottom of the short stakes, long piling bar, its lower end are embedded in the good soil layer of closest weak substratum to be reinforced through after weak substratum is reinforced, and the foundation bearing capacity of short stakes and the good soil layer embedded by long piling bar bottom is more than 80kPa.The present invention can either improve basal heave stability, effectively solve the problems, such as the preventing and treating of foundation ditch bottom heave, not need large area earth excavation again, avoid is influenceed by adverse weather, and easy for construction efficient, and the construction period is shorter, low engineering cost, it is worthy of popularization.
Description
Technical field
The present invention relates to Soft Deep Foundation Pit, slope reinforcement field, and in particular to one kind is used to prevent and administer Foundation Pit
The long-short pile of bottom protuberance reinforces framework and reinforcement means.
Technical background
Due to the deposition of geologic origin, such as history lake, river course；Or the selection due to construction project base position, make
Substrate location may fall on the crust layer with weak substratum；Or in soft clay area progress excavation of foundation pit, easily send out
Raw building enclosure sidesway and foundation ditch bottom heave, so having to consider foundation ditch stable problem, wherein pit accident is stably tested
Very the key link at last.
When handling soft soil foundation excavation, substrate having weak substratum, salvage of foundation pits, Steel-bar Pile, coagulation can be often used
The methods of native stake, sand pile, lime pile, chemical grouting or piling prepressing, wherein the most commonly used with deal pile and fir pile.Pine sheet
Body contains abundant rosin, and these rosin can prevent underground water and bacterium from corroding to it well, suitably level of ground water with
Lower work, it is particularly suitable for the processing of southern muck soil soft foundation, controls slope displacement to rise in deep foundation pit support very big
Effect, compensate for the rough sledding that soil nail wall works in soft mud.Deal pile has good anti-bending strength in the soil body,
Deal pile is squeezed into according to certain length and rational spacing form one of earth-retaining barrier in the middle part of excavation slope, can be effectively
Reduce soil body lateral pressure, to reach the purpose for keeping stability of slope.
In fact, in the engineering practice of pattern foundation pit supporting structure, for depth 3m~5m foundation ditch, deal pile+soil is widely applied
Nail (anchor pole) is used as fender body.The timber of two kinds of specifications would generally be used, a kind of is 4m~6m length, diameter 150mm~200mm
Short stakes, it is relatively common per 20 yuan of radical valence lattice；Another kind is the timber of 9m length, more rare.Timber played in fender body with
Lower effect (1) earth-retaining effect；(2) horizontal pressure force is born；(3) prevent foundation ditch from integrally destroying；(4) crater wall displacement is reduced；(5) prevent
Bottom heave.After timber is set, on the one hand the deadweight of the crater wall soil body can be transmitted downwards by timber, while timber also blocks
The passage of soil body motion, good resistant function is served to bottom heave, while also reduces ground settlement, adds crater wall
Stabilization.But in the case of foundation ditch bottom surface exists below multilayer weak substratum, merely using piling bar, mixing pile, perfusion
Stake is reinforced, and there is the problem of construction is inconvenient, speed is slow, cost is higher.
Length pile supporting system is a kind of safe and reliable support system.Micro- weathered rock formation buried depth is shallower, big rise and fall
Stratum have and save the duration, reduce the advantage such as difficulty of construction, the extensive use in the foundation ditches such as subway, building, industry, and
It is developed for handling some special broken piles, achieves good economic benefit.In long-short pile foundation pit supporting system, cantilever
Length discrepancy foundation pit supporting pile cooperate mechanism be：Mainly build-in and antidumping by long stake, finally carries soil pressure；
Stub simply plays a part of earth-retaining and transmits soil pressure.In general, in long-short pile foundation pit supporting system, stub it is maximum curved
Length stake in the isometric pile supporting system of moment ratio tradition is small, and the long stake in the maximal bending moment pile supporting system more isometric than tradition for growing stake
It is big by about one time.The resistance to overturning of foundation ditch is by growing stake control, and stub meets bending resistance requirement, therefore the construction method of long-short pile is filled
The shearing resistance effect of the soil body has been waved in distribution, to the less demanding soft soil foundation pit of Deformation control, has good practicality.It is overall and
Speech, length pile supporting system has no significant difference compared with the isometric pile supporting system of tradition on support capacity, but long-short pile
Support system can generally reduce quantities, and can obtain significant economic benefit.
The content of the invention
The present invention provides a kind of long-short pile for being used to prevent and administer foundation ditch bottom heave according to the deficiencies in the prior art and added
Gu framework and reinforcement means, when this method has two layers or more than two layers for the weak substratum below foundation ditch bottom surface, in toe
The long-short pile that interval is laid is squeezed into, first layer weak substratum (i.e. shallow-layer weak substratum) is reinforced with short stakes, with long piling bar
The weak substratum (i.e. deep layer weak substratum) reinforced below the second layer and the second layer, foundation ditch Resistant heave is improved so as to reach
The purpose of stability, the present invention utilize the collective effect of long-short pile, can either improve basal heave stability, make up to rule
Model requirement, does not need large area earth excavation again, and avoid is influenceed by adverse weather, energy accelerating construction progress, reduces work
Journey is invested.
Technical scheme provided by the invention：A kind of long-short pile for being used to prevent and administer foundation ditch bottom heave reinforces knot
Structure, including foundation ditch, just there is two layers or more than two layers of weak substratum under the hole of foundation ditch, it is characterised in that：The reinforcing
Structure also includes inserting the more short stakes at Foundation Pit bottom and long piling bar, the short wood along the domatic toe interval of foundation ditch slope
The fully-inserted Foundation Pit bottom of stake, and first layer weak substratum square under lower end insertion Foundation Pit, and embedded first layer is weak
Below subjacent bed in the viscous soil horizon of closest first layer weak substratum, the long piling bar passes through fully-inserted Foundation Pit bottom,
Its lower end passes through all weak substratums, and closest bottom weak substratum below embedded bottom weak substratum
In viscous soil horizon；The foundation bearing capacity of viscous soil horizon embedded by the short stakes and long piling bar bottom is more than 80kPa.
The present invention preferably technical scheme：The short stakes are length 4m~6m, diameter 150mm~200mm deal pile
Or fir pile, its complete appearance is lossless, and the smooth zero defect of pile body, upper and lower even thickness after peeling, the insertion end of short stakes are in
It is cone-shaped；The long piling bar is I-steel or channel-section steel, and its insertion end is wedge shape.
The present invention preferably technical scheme：The depth of the foundation ditch is no more than 5m, short stakes and long piling bar lower end insertion ground
Depth in viscous soil horizon of the base bearing capacity more than 80kPa is more than 1m.
The present invention preferably technical scheme：The short stakes and long piling bar are equidistantly uniformly distributed, and adjacent short stakes and
Spacing between long piling bar is 0.5-1m.
A kind of long-short pile reinforcement means for being used to preventing and administering foundation ditch bottom heave provided by the invention, it is characterised in that
Specific construction step is as follows：
(1) according to geological survey and exploration determine the size of foundation ditch, depth, Foundation Pit bottom weak substratum position,
The depth of the number of plies and every layer of weak substratum, when foundation depth is no more than 5m, there is two layers or more than two layers of weakness in hole bottom
During subjacent bed, long-short pile consolidation process is proceeded by；
(2) basis《JGJ120-2012 building foundation pit supporting technical regulations》Specified in resistance to chloride ion check formula
Calculate when meeting basal heave stability requirement, short stakes and long piling bar are respectively embedded into the depth D1 and D2 at hole bottom most
Small value, then obtain first layer weak substratum according to the data surveyed in step (1), first layer weak substratum lower section is most faced
Below viscous soil horizon of the near and foundation bearing capacity more than 80kPa, bottom weak substratum and bottom weak substratum most
Close on and foundation bearing capacity is more than 80kPa viscous soil horizon depth value, and combine the short stakes calculated and long piling bar difference
The value range of embedded hole bottom depth determines that the stake of short stakes and long piling bar is long, and wherein the length of short stakes is more than short stakes insertion hole
Bottom depth D1 minimum value, and more than or equal to Foundation Pit bottom surface to below first layer weak substratum closest to foundation bearing
The depth of 1m positions in viscous soil horizon of the power more than 80kPa；The length of long piling bar is more than long piling bar insertion hole bottom depth D2 most
Small value, and more than or equal to Foundation Pit bottom surface to below bottom weak substratum closest to foundation bearing capacity be more than 80kPa
Viscous soil horizon in 1m positions depth；Then begin preparing for short stakes and long timber, the short stakes using length 4m~6m,
Diameter 150mm~200mm deal pile or fir pile, its complete appearance is lossless, and the smooth zero defect of pile body, thick up and down after removing the peel
It is thin uniformly, and be inserted into be whittled into it is cone-shaped；The long piling bar uses I-steel or channel-section steel, and its insertion end is cut into using oxy-acetylene
Wedge shape；
(3) layouted along the line of foundation ditch toe edge and determine the insertion position of short stakes and long piling bar, then start to construct
Short stakes, during the construction of every short stakes, its tip cone end down, enters to be about to it to be completely forced into soil layer using hydraulic crawler excavator, really
Protect its lower end of every short stakes and pass through Foundation Pit bottom underlying first layer weak substratum, and insert below first layer weak substratum
Closest to viscous soil horizon of the foundation bearing capacity more than 80kPa in below 1m position, every 3~5min is pressed into a short wood
Stake；
(4) after short stakes are all pressed into, the construction of long piling bar is proceeded by, long piling bar is hung to by stake by crane first
Position, and after centering, straightening, squeezed into using hammer driven, vibrations, any one mode in static(al) press-in or vibrations hammer driven
It is completely forced into soil layer, it is ensured that per root long piling bar lower end through square bottom weak substratum under Foundation Pit, and insert
Below bottom weak substratum closest to soil layer of the foundation bearing capacity more than 80kPa in below 1m position, per pile
Engineering time be 2~5min；The long piling bar and short stakes that construction is completed are spaced, and between adjacent long piling bar and short stakes
Spacing be 0.5-1m.
When carrying out Stability Checking to long-short pile in step (2) of the present invention, use《JGJ120-2012 building foundation pit supportings
Technical regulation》Specified in resistance to chloride ion check formula it is as follows：
q1=0.5 γ1H0+γ2D ④
q2=γ1H0+γ2D+q ⑤
In formula：Ks--- Resistant heave safety coefficient；Safe class is two level, the supporting construction of three-level, is no less than respectively
1.6、1.4；
H0--- foundation depth (m)；
D --- supporting construction building-in depth (m), when having weak substratum below soil blocking component bottom surface, take foundation ditch bottom surface
To the soil thickness of weak substratum top surface；
γ1--- more than the outer soil blocking component bottom surface of foundation ditch native average severe (kN/m3)；
γ2--- average severe (kN/m more than soil blocking component bottom surface native in foundation ditch3)；
C --- native cohesive strength (kPa) below soil blocking component bottom surface；
φ --- native internal friction angle (°) below soil blocking component bottom surface；
Nc、Nq--- coefficient of bearing caoacity；
Q --- ground evenly load (kPa)；
d1--- the domatic width (m) of soil nail wall；
d2--- the calculating width (m) of ground evenly load, it can use d2=H0。
When every short stakes in step (3) of the present invention are constructed：Using manually stake is helped in place, by the bucket of hydraulic crawler excavator
Turn around and withhold short stakes, short stakes are first pressed into ground certain depth from steady, then allows and helps a people to leave, will be short by excavator
Timber is pressed onto projected depth.
When every root long piling bar in step (4) of the present invention is constructed：Long piling bar is sling using 3t cranes, human assistance centering,
Straightening, certain depth is first pressed into from after surely using pile press machine, allows and helps a people to leave, then long piling bar is pressed onto by design using pile press machine
Depth.
The deal pile used in the present invention, the general long 4m deal pile market price is 20 yuan/root, and specification is A48 δ 3.3
Long 4m 100 yuan/root of floral tube price, the I of 9m length22aAbout 1300 yuan/root of type I-steel, wherein A represent diameter, and δ represents floral tube wall
Thickness, the cost ratio of three kinds of stakes is about timber：Floral tube：I-steel=1:5:10, thus it is apparent using the economy of timber.
The present invention is easy for construction, and the raw material such as timber used, I-steel are easily obtained, construction using excavator press-in side
Method, it is easy for construction, excessive interference will not be given birth to substrate local products.Scheme of the present invention combines the excellent of timber and steel H pile
Gesture, timber and piling bar arranged for interval are carried out, can effectively solve the problems, such as the preventing and treating of foundation ditch bottom heave, and can enough sides of reduction
Case cost, while construction is also convenient for efficiently.
Brief description of the drawings
Fig. 1 is the ruggedized construction schematic diagram of the embodiment of the present invention；
Fig. 2 is the ruggedized construction diagrammatic cross-section of the embodiment of the present invention；
Fig. 3 is the ruggedized construction top view of the embodiment of the present invention；
Fig. 4 is the bottom heave sliding surface schematic diagram of the embodiment of the present invention；
Fig. 5 is the bottom heave Stability Checking schematic diagram in the present invention；
Fig. 6 is the length pile constructing process figure of the present invention.
In figure, 1-foundation ditch slope top of the slope, 2-foundation ditch slope is domatic, 3-short stakes, 4-long steel H pile, 5-foundation ditch
Hole bottom, 6-first layer weak substratum, 7-bottom weak substratum, 8-top of the slope load, 9-cheat under the first layer weakness of bottom
The Character On The Multiple Slide Plane of sleeping layer top surface and circular sliding surface composition, 10-cross the circular sliding surface at stub bottom, 11-hole bottom second layer
The Character On The Multiple Slide Plane of weak substratum top surface and circular sliding surface composition, the circular sliding surface at 12-long stake bottom, 13-foundation ditch
Domatic width, the calculating width of 14-ground evenly load, 15-foundation depth, 16-foundation ditch bottom surface to Resistant heave Calculation Plane
Between the thickness of the layer, 17-foundation ditch bottom surface to the natural density of soil layer between Resistant heave Calculation Plane and respective thickness multiply
Machine, native distributed load in more than 18-Resistant heave Calculation Plane domatic width range, 19-Resistant heave Calculation Plane is with Shangdi
Face evenly load calculates the distributed load of figure in width range.
Embodiment
The present invention will be further described with reference to the accompanying drawings and examples.One kind as shown in Figure 1 to Figure 3 is used to prevent
With the long-short pile ruggedized construction for administering foundation ditch bottom heave, including foundation ditch, just have under the hole of foundation ditch two layers or more than two layers
Weak substratum, it is characterised in that：The ruggedized construction also includes inserting foundation ditch along the toe interval of foundation ditch slope domatic 2
The more short stakes 3 and long piling bar 4 at bottom 5 are cheated, the depth of the foundation ditch 2 is no more than 5m., the short stakes 3 be length 4m~6m,
Diameter 150mm~200mm deal pile or fir pile, its complete appearance is lossless, and the smooth zero defect of pile body, thick up and down after removing the peel
Thin uniform, the insertion end of short stakes 3 is in cone-shaped；The long piling bar 4 typically uses length 6m~10m I-steel or channel-section steel,
Its insertion end is wedge shape.The fully-inserted Foundation Pit bottom 5 of short stakes 3, and the first layer of the lower section of lower end insertion Foundation Pit bottom 5 is soft
Weak subjacent bed 6, and in the viscous soil horizon of the closest first layer weak substratum 6 in lower section of embedded first layer weak substratum 6, it is described
Long piling bar 4 passes through fully-inserted Foundation Pit bottom 5, and its lower end passes through all weak substratums, and the embedded bottom is weak lower sleeping
In the viscous soil horizon of the closest bottom weak substratum 7 in the lower section of layer 7；It is viscous embedded by short stakes 3 and long piling bar 4 bottom
The foundation bearing capacity of property soil layer is more than 80kPa.And short stakes 3 and the lower end of long piling bar 4 insertion foundation bearing capacity are viscous more than 80kPa
Depth in property soil layer is more than 1m.The short stakes 3 and long piling bar 4 are equidistantly uniformly distributed, and adjacent short stakes 3 and long piling bar
Spacing between 4 is 0.5-1m.
Embodiment：The present invention is reinforced for a certain Deep Foundation Pit and is embodied, its project profile：Place is located at elder brother
Bright city Guandu District, projects awaiting construction plan the total ㎡ of land area 52020.60, foundation ditch vertical cut line Zhou Changyue 849m, provided with one layer
Basement section and two layers of basement section, 3.6~7.7m of excavation of foundation pit depth.The supporting scheme used for：(1) slope+length
Auger boring pouring pile+recoverable prestressed anchor cable scheme；(2) slope+grouting tube scheme.
Foundation ditch west side uses supporting scheme (2), and according to geology prospecting report, the depth of foundation ditch is 3.5m, is deposited below bottom
In two weak substratums, length is about 200m, and the depth of first layer weak substratum is 4.5m, second layer weak substratum
Depth is 9m；If not using reinforcement measure to prevent and treat bottom heave, the sliding surface of resistance to chloride ion checking computations is to include weakness
The Character On The Multiple Slide Plane of subjacent bed top surface and circular sliding surface, respectively Fig. 4 bottom heaves sliding surface illustrate graph laplacian 9 and label
11, then can basis《JGJ120-2012 building foundation pit supporting technical regulations》Specified in resistance to chloride ion calculation formula
Obtain cheating bottom first layer, second layer weak substratum stability against heave property coefficient, respectively K1=1.53 and K2=1.46, and be somebody's turn to do
The deep pit monitor grade of construction work is two level, takes Ks=1.6, then there is K1<KsAnd K2<Ks, it is unsatisfactory for the stability against heave of specification
Property require, it is therefore desirable to reinforced.
The specific method that it is reinforced is as follows：
(1) basis《JGJ120-2012 building foundation pit supporting technical regulations》Specified in resistance to chloride ion check formula
And the numerical value of exploration determines to lay out pile using diameter 150mm, length 4m timber interval 1m, carry out first layer weak substratum and add
Gu；Using length 9m I22aSteel H pile interval 1m lays out pile, and carries out second layer weak substratum reinforcing；
(2) layouted along the line of foundation ditch toe edge and determine the insertion position of short stakes and long piling bar, then start to construct
Short stakes, it is necessary to check whether timber outward appearance is intact before the construction of every short stakes, and check after peeling whether is pile body
Smooth zero defect, upper and lower even thickness, to ensure the quality of timber, then the insertion end of deal pile 3 is whittled into it is cone-shaped, so as to
When in piling can smooth injection ground, reduce resistance, protect pile crown, most pile body all in press-in soil at last；During Specific construction,
Using manually stake is helped in place, its tip cone end down, the bucket of hydraulic crawler excavator is turned around and withholds short stakes, first by short stakes pressure
Enter ground certain depth from steady, then allow and help a people to leave, short stakes are pressed onto by excavator and are completely forced into soil layer, it is ensured that be every
Its lower end of root short stakes passes through Foundation Pit bottom underlying first layer weak substratum, and inserts below first layer weak substratum and most face
The position of below 1m in viscous soil horizon of the near foundation bearing capacity more than 80kPa, every 3~5min are pressed into a short stakes；
(3) after short stakes are all pressed into, the construction of long piling bar is proceeded by, in view of weak soil soil property is deep in place, institute
To use static press piling here；Pile crown is cut into wedge shape by piling bar insertion end with oxy-acetylene before construction, then measure, unwrapping wire it is fixed
Stake position, steel H pile is sling with 3t cranes, worker aids in centering, straightening, is pressed into piling bar with crawler type pile press machine, certain depth is certainly
After steady, allow and help a people to leave, steel H pile pressure is completely forced into soil layer by crawler type pile press machine, it is ensured that per root long piling bar lower end
Square bottom weak substratum under through Foundation Pit, and insert below bottom weak substratum closest to foundation bearing capacity
The position of below the 1m in soil layer more than 80kPa, the engineering time per pile is 2~5min；Construct complete long piling bar with
Short stakes are spaced, and the spacing between adjacent long piling bar and short stakes is 1m.
After being pressed into long-short pile in excavation slope bottom, basal heave stability checking computations, resistance to chloride ion are carried out again
The sliding surface of checking computations is the checking computations by the 10 and 12 of the circular sliding surface, respectively Fig. 4 bottom heaves sliding surface schematic diagram at stake bottom
Process is as follows：
1st, for first layer weak substratum, laid out pile using diameter 150mm, length 4m timber interval 1m, carry out first
Layer weak substratum is reinforced.Foundation bearing capacity is more than 80kPa cohesive soil below timber pile top insertion first layer weak substratum
1.2m in layer, thus may determine that following parameter：Foundation depth H0=3.5m, hole bottom is away from soil blocking component bottom distance D=4m, viscosity
Soil layer cohesive strength c=34kPa, internal friction angleTop of the slope distributed load is set to q=20kPa.
Coefficient of bearing caoacity：
The average severe of the soil body on the outside of foundation ditch：
The average severe of the soil body on the inside of foundation ditch：
Soil body load in the range of soil nail wall：
Soil body load in the evenly load computer capacity of ground：
q1=15.82 × 3.5+14.45 × 4+20=133.17kPa
Substituting into formula has basal heave stability coefficient：
Because K1'=3.94>Ks=1.6, so, the stability against heave sexual satisfaction requirement of first layer weak substratum.
2nd, for second layer weak substratum, using length 9m I22aSteel H pile interval 1m lays out pile, and it is soft to carry out the second layer
Weak subjacent bed is reinforced.Foundation bearing capacity is more than below steel H pile pile top insertion timber pile top insertion second layer weak substratum
80kPa viscous soil horizon 1.4m, thus may determine that following parameter：Foundation depth H0=3.5m, hole bottom away from soil blocking component bottom away from
From D=9m, viscous soil horizon cohesive strength c=28.6kPa, internal friction angleTop of the slope distributed load is set to q=20kPa.
Coefficient of bearing caoacity：
The average severe of the soil body on the outside of foundation ditch：
The average severe of the soil body on the inside of foundation ditch：
Soil body load in the range of soil nail wall：
Soil body load in the evenly load computer capacity of ground：
q1=15.552 × 3.5+14.84 × 9+20=207.992kPa
Substituting into formula has basal heave stability coefficient：
Because K'2=5.86>Ks=1.6, so, the stability against heave sexual satisfaction requirement of second layer weak substratum.
Grouting tube, steel H pile, long screw auger is respectively adopted also directed in 200m anti-protuberance reinforcing scope in inventor
Hole pouring pile, the cost of length piling method of the present invention reinforcing pair calculate.Wherein grouting tube is designed as the@500 of A48 δ 3.3,
Every meter of cement consumption 50kg, then slip casting is floral tube price 230+243=468 members/root, totally 400,18.92 ten thousand yuan of total price；I-shaped
Piling bar is designed as I22a@1000, every 1300 yuan, totally 200,26.00 ten thousand yuan of total price；Long screw auger drilling deposited pile is designed as
A600@1200, every 3500 yuan, totally 167,58.45 ten thousand yuan of total price；The present invention carries long-short pile and is designed as：Timber A100@
2400, every 20 yuan, common root 84,0.168 ten thousand yuan of timber total price, piling bar is designed as I22a@2400, every 1300 yuan, common root 84,
10.92 ten thousand yuan of steel H pile total price, 11.088 ten thousand yuan of scheme total price.So the cost ratio of four kinds of schemes is：Long-short pile of the present invention
Scheme：Grouting tube scheme：Steel H pile scheme：Long screw auger drilling deposited pile scheme=11.088 ten thousand yuan：18.92 ten thousand yuan：
26.00 ten thousand yuan：58.45 ten thousand yuan, the present invention puies forward the economic advantages of long-short pile Scheme of Strengthening clearly, and saves the duration, applies
Work is convenient.
It can see by analysis above, when Foundation Pit bottom has weak substratum, can cause without slope reinforcement
Larger protuberance risk be present in hole bottom.The floral tube typically used is reinforced, concrete-pile is reinforced, simple piling bar is reinforced, all in the presence of one
The problem of determining, such as the problems such as inconvenient, speed is slow, cost is higher of constructing.And the present invention carries reinforcement means, timber used,
The raw material such as I-steel are easily obtained, and construction high construction efficiency, will not be given birth to excessive using the method for excavator press-in to substrate local products
Interference.The collective effect that the method for the invention is filled using short stakes and long steel, can either improve basal heave stability, have
The preventing and treating for solving the problems, such as foundation ditch bottom heave of effect, reaches code requirement, does not need large area earth excavation again, avoids incident
Influenceed by adverse weather, energy accelerating construction progress, and the present invention suggests plans with obviously economic sexual clorminance, is worth
Popularization and application.
Claims (8)
1. a kind of long-short pile ruggedized construction for being used to preventing and administering foundation ditch bottom heave, including foundation ditch, under the hole of foundation ditch
There is two layers or more than two layers of weak substratum side, it is characterised in that：The ruggedized construction also includes domatic along foundation ditch slope
(2) the more short stakes (3) and long piling bar (4), the short stakes (3) of toe interval insertion Foundation Pit bottom (5) are fully-inserted
Foundation Pit bottom (5), and the first layer weak substratum (6) below lower end insertion Foundation Pit bottom (5), and under embedded first layer weakness
Below sleeping layer (6) in the viscous soil horizon of closest first layer weak substratum (6), the fully-inserted Foundation Pit of the long piling bar (4)
Bottom (5), its lower end passes through all weak substratums, and the closest bottom is soft below embedded bottom weak substratum (7)
In the viscous soil horizon of weak subjacent bed (7)；The ground of viscous soil horizon embedded by the short stakes (3) and long piling bar (4) bottom is held
Carry power and be more than 80kPa.
2. a kind of long-short pile ruggedized construction for being used to preventing and administering foundation ditch bottom heave according to claim 1, it is special
Sign is：The short stakes (3) are length 4m~6m, diameter 150mm~200mm deal pile or fir pile, its complete appearance
It is lossless, and the smooth zero defect of pile body, upper and lower even thickness after peeling, the insertion end of short stakes (3) is in cone-shaped；The long piling bar
(4) it is I-steel or channel-section steel, its insertion end is wedge shape.
3. a kind of long-short pile ruggedized construction for being used to preventing and administering foundation ditch bottom heave according to claim 1 or 2, its
It is characterised by：The depth of the foundation ditch (2) is no more than 5m, and short stakes (3) and long piling bar (4) lower end insertion foundation bearing capacity are more than
Depth in 80kPa viscous soil horizon is more than 1m.
4. a kind of long-short pile ruggedized construction for being used to preventing and administering foundation ditch bottom heave according to claim 1 or 2, its
It is characterised by：The short stakes (3) and long piling bar (4) are equidistantly uniformly distributed, and adjacent short stakes (3) and long piling bar (4) it
Between spacing be 0.5-1m.
5. a kind of long-short pile reinforcement means for being used to preventing and administering foundation ditch bottom heave, it is characterised in that Specific construction step is such as
Under：
(1) size, depth, Foundation Pit bottom weak substratum position, the number of plies of foundation ditch are determined according to geological survey and exploration
And the depth of every layer of weak substratum, when foundation depth is no more than 5m, hole bottom is in the presence of sleeping under two layers or more than two layers of weakness
During layer, long-short pile consolidation process is proceeded by；
(2) basis《JGJ120-2012 building foundation pit supporting technical regulations》Specified in resistance to chloride ion check formula calculate
Go out when meeting basal heave stability requirement, short stakes and long piling bar are respectively embedded into the depth D1 and D2 at hole bottom minimum
Value, then according in step (1) survey data obtain first layer weak substratum, first layer weak substratum lower section closest to
And most face below viscous soil horizon of the foundation bearing capacity more than 80kPa, bottom weak substratum and bottom weak substratum
Near and foundation bearing capacity is more than 80kPa viscous soil horizon depth value, and embedding with reference to the short stakes calculated and long piling bar difference
The value range for entering to cheat bottom depth determines that the stake of short stakes and long piling bar is long, and wherein the length of short stakes is more than short stakes insertion hole bottom
Depth D1 minimum value, and more than or equal to Foundation Pit bottom surface to below first layer weak substratum closest to foundation bearing capacity
The depth of 1m positions in viscous soil horizon more than 80kPa；The length of long piling bar is more than long piling bar insertion hole bottom depth D2 minimum
Value, and more than or equal to Foundation Pit bottom surface to below bottom weak substratum closest to foundation bearing capacity more than 80kPa's
The depth of 1m positions in viscous soil horizon；Then short stakes and long timber are begun preparing for, the short stakes are using length 4m~6m, straight
Footpath 150mm~200mm deal pile or fir pile, its complete appearance is lossless, and the smooth zero defect of pile body, upper and lower thickness after peeling
Uniformly, and be inserted into end be whittled into it is cone-shaped；The long piling bar uses I-steel or channel-section steel, and its insertion end is cut into using oxy-acetylene
Wedge shape；
(3) layouted along the line of foundation ditch toe edge and determine the insertion position of short stakes and long piling bar, then start short wood of constructing
Stake, when every short stakes are constructed, its tip cone end down, is completely forced into soil layer using hydraulic crawler excavator, it is ensured that every short
Its lower end of timber passes through Foundation Pit bottom underlying first layer weak substratum, and insert below first layer weak substratum closest to
The position of below 1m in viscous soil horizon of the foundation bearing capacity more than 80kPa, every 3~5min are pressed into a short stakes；
(4) after short stakes is all pressed into, the construction of long piling bar is proceeded by, long piling bar is hung to by stake position by crane first,
And after centering, straightening, squeezed into using hammer driven, vibrations, any one mode general in static(al) press-in or vibrations hammer driven
It is completely forced into soil layer, it is ensured that per root long piling bar lower end through square bottom weak substratum under Foundation Pit, and is inserted most
Below bottom weak substratum closest to good soil layer of the foundation bearing capacity more than 80kPa in below 1m position, per pile
Engineering time be 2~5min；The long piling bar and short stakes that construction is completed are spaced, and between adjacent long piling bar and short stakes
Spacing be 0.5-1m.
6. a kind of long-short pile reinforcement means for being used to preventing and administering foundation ditch bottom heave according to claim 5, it is special
Sign is that the resistance to chloride ion check formula described in step (2) is：
q1=0.5 γ1H0+γ2D ④
q2=γ1H0+γ2D+q ⑤
In formula：Ks--- Resistant heave safety coefficient；Safe class is two level, the supporting construction of three-level, respectively no less than 1.6,
1.4；
H0--- foundation depth (m)；
D --- supporting construction building-in depth (m), when having weak substratum below soil blocking component bottom surface, foundation ditch bottom surface is taken to soft
The soil thickness of weak subjacent bed top surface；
γ1--- more than the outer soil blocking component bottom surface of foundation ditch native average severe (kN/m3)；
γ2--- average severe (kN/m more than soil blocking component bottom surface native in foundation ditch3)；
C --- native cohesive strength (kPa) below soil blocking component bottom surface；
φ --- native internal friction angle (°) below soil blocking component bottom surface；
Nc、Nq--- coefficient of bearing caoacity；
Q --- ground evenly load (kPa)；
d1--- the domatic width (m) of soil nail wall；
d2--- the calculating width (m) of ground evenly load, it can use d2=H0。
7. a kind of long-short pile reinforcement means for being used to preventing and administering foundation ditch bottom heave according to claim 5, it is special
When sign is the every short stakes construction in the step (3)：Using manually helping stake in place,
The bucket of hydraulic crawler excavator is turned around and withholds short stakes, short stakes are first pressed into ground certain depth from steady, Ran Hourang
Help a people to leave, short stakes are pressed onto projected depth by excavator.
8. a kind of long-short pile reinforcement means for being used to preventing and administering foundation ditch bottom heave according to claim 5, it is special
When sign is every root long piling bar construction in the step (4)：Long piling bar is sling using 3t cranes, human assistance centering, straightening,
First allow from after surely using pile press machine press-in certain depth and help a people to leave, then long piling bar is pressed onto by projected depth using pile press machine.
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| CN108333331A (en) * | 2018-02-12 | 2018-07-27 | 广西大学 | Small Data Sets shallow embedding tunnel overlying and side wall geotechnical stability evaluation method |
| CN108487256A (en) * | 2018-03-07 | 2018-09-04 | 中冶集团武汉勘察研究院有限公司 | A kind of ruggedized construction and method that foundation pit deepened is backbreak |
| CN110457636A (en) * | 2018-05-07 | 2019-11-15 | 中铁二院工程集团有限责任公司 | A kind of length mini pile reinforces roadbed basement high method for determination of amount after expansive soil foundation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108333331A (en) * | 2018-02-12 | 2018-07-27 | 广西大学 | Small Data Sets shallow embedding tunnel overlying and side wall geotechnical stability evaluation method |
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| CN110457636A (en) * | 2018-05-07 | 2019-11-15 | 中铁二院工程集团有限责任公司 | A kind of length mini pile reinforces roadbed basement high method for determination of amount after expansive soil foundation |
| CN110457636B (en) * | 2018-05-07 | 2022-09-16 | 中铁二院工程集团有限责任公司 | Method for determining base uplift amount of rear road foundation of long and short micro-pile reinforced expansive soil foundation |
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| CN107587511B (en) | 2019-06-07 |
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