CN203145032U - Limestone soil-pervious concrete pile composite foundation - Google Patents
Limestone soil-pervious concrete pile composite foundation Download PDFInfo
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- CN203145032U CN203145032U CN 201320146122 CN201320146122U CN203145032U CN 203145032 U CN203145032 U CN 203145032U CN 201320146122 CN201320146122 CN 201320146122 CN 201320146122 U CN201320146122 U CN 201320146122U CN 203145032 U CN203145032 U CN 203145032U
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Abstract
The utility model discloses a limestone soil-pervious concrete pile composite foundation. A limestone soil-pervious concrete pile comprehensive treatment method is adopted for controlling accumulation and sedimentation of a wet and soft foundation caused by traffic loads. The limestone soil-pervious concrete pile composite foundation is suitable for reinforcement of the wet and soft foundation so that the wet and soft foundation can have both high bearing capacity and high permeable capacity. The limestone soil-pervious concrete pile composite foundation comprises a limestone soil layer and pervious concrete piles which are buried under the limestone soil layer in a dispersed mode. A broken stone hardcore is laid on the surface of the limestone soil layer.
Description
Technical field
The utility model relates to a kind of composite foundation, is specifically related to a kind of rendzinas-permeable concrete pile composite foundation that is suitable for low roadbed.Belong to technical field of civil engineering.
Background technology
The Udoll ground generally is distributed in areas such as strand, lake, the lowest point, seabeach, has the natural moisture content height, characteristics such as void ratio is big, compressibilty is strong, shear strength is low and supporting capacity is low.In a single day the Udoll ground is disturbed, and the intensity of soil obviously descends, even is mobile.Therefore, build road at wet subgrade and can run into the big and roadbed of the natural ground cumulative settling distortion problems such as more difficult compacting of banketing, melt the Pluvial in summer in the spring, the frost boiling disease takes place frequently, pavement cracking, and maintenance costs is very high.In order to reduce the excessive sedimentation of ground that roadbed deadweight causes, to account for and plough and reduce the construction energy consumption less, adopt low embankment scheme to become a kind of trend of road construction.But the natural ground that the reduction of depth of fill makes top be positioned at the scope of vehicle-mounted effect produces excessive cumulative settling under traffic loading acts on repeatedly; And, develop rapidly along with transportation, the automobile overload phenomenon is also serious day by day, the speed of a motor vehicle is also improving constantly, and this has further aggravated the cumulative settling of Udoll ground, and the ground cumulative settling can further cause pavement destruction, cause the road surface horizontal wall inscription to change greatly, ponding is serious, not only brings safety problem to driving, also can cause the bad pavement disease that waits of damage by water.Therefore, the Udoll ground is carried out consolidation process and can significantly reduce the risk that roadbed unstability or excessive depression take place.
Chinese patent application 201210349658.4 discloses a kind of agitation pile-permeable concrete pile composite foundation and processing method, Chinese patent application 201210352336.5 discloses the novel binary composite foundation of a kind of granular pile-permeable concrete stake and processing method, Chinese patent application 201210352089.9 discloses a kind of low-intensity rigid pile-novel binary composite foundation of permeable concrete stake and processing method, though these three kinds of composite foundations have high-bearing performance and high drainage performance, but all belong to the binary treatment process of composite foundation, two kinds of pile bodies need construction respectively, and need certain blanking time, make the duration longer; And do not carry out the top layer and handle, excessive for water content, swell-shrink characteristic is high, have settlement by soaking, the wet subgrade that supporting capacity is low is easy to generate under load action and slides or consolidation settlement, is unfavorable for the operations of marching into the arena such as construction machinery, facility, personnel.So, need carry out shallow-layer to wet subgrade and handle.
The rendzinas processing method is widely used in the Udoll ground shallow and handles, quicklime and soil can take place that a series of reaction divides water in soil to reduce, soil particle cohesion and forming than buckshot aggregate, soil body chemical reaction generates compound hydrate simultaneously, and sclerosis gradually in water, thereby be bonded together the physico-mechanical properties that has improved ground with soil particle.
But, it is little that rendzinas and cement-soil foundation reinforcement method are handled the degree of depth, just form crust layer on ground top, and that the dynamic stress that the loaded vehicle of running at high speed produces influences the degree of depth is big, therefore, accelerate the draining of ground deep layer to reducing the accumulation of deep layer excess pore water pressure, it is significant to accelerate wet subgrade deep layer cumulative settling, but lacks relevant technology at present.
Summary of the invention
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, a kind of rendzinas-permeable concrete pile composite foundation that is suitable for low roadbed being provided.The utility model adopts the wet subgrade cumulative settling that rendzinas-comprehensively punishment method of permeable concrete stake control traffic loading causes, the low embankment of control (≤1.5m) wet subgrade cumulative settling down particularly, be applicable to wet soft groundsill reinforcing, make wet subgrade both have high supporting capacity, have strong water permeable ability again.
For achieving the above object, the utility model adopts following technical proposals:
A kind of rendzinas-permeable concrete pile composite foundation comprises that lime soil layer and dispersion are embedded in the following permeable concrete stake of lime soil layer, and hardcore bed is laid on the surface of described lime soil layer.
Described permeable concrete stake is some rows, and each row's quantity equates, and cover off, the whole arranged in squares that forms.
Described permeable concrete stake is some rows, side from described composite foundation, the permeable concrete stake of each even rows is arranged on the center line of two adjacent permeable concrete stake lines of odd number row, each permeable concrete stake and adjacent two permeable concrete stakes formation triangular arrangement.
The thickness of described hardcore bed is 15～30cm.
The stake footpath of described permeable concrete stake is 350～600mm, and stake is long to be 4～5m, and the pilespacing of two adjacent permeable concrete stakes is 3～5 times of stake footpath.
The processing method of above-mentioned composite foundation, concrete steps are as follows: 1) prefabricated permeable concrete stake: formwork on compacting, smooth stake processed place, build permeable concrete then, treat the lifting of maintenance to 70% intensity, and continuing the permeable concrete stake that maintenance obtains 100% intensity, transportation is stacked standby;
2) be that 5～7% quicklime is handled wet subgrade shallow-layer and formed the lime soil layer with the quality volume;
3) at the lime soil layer hole is set, the aperture in described stake hole is than the big 20cm in stake footpath;
4) the permeable concrete stake that step 1) is obtained is arranged in the hole, space landfill coarse sand around it; Square or triangular arrangement are adopted in the permeable concrete stake;
5) lay hardcore bed at the rendzinas laminar surface.
In the step 1), the concrete crushing strength of described permeable concrete stake is more than or equal to 20MPa, and transmission coefficient is more than or equal to 2mm/s.
Step 2) in, described quicklime be fresh quicklime or will concentrate stacking after quicklime cleared up in 7～10 days before use and sieve.
Step 2) in, described shallow-layer refers to that wet subgrade is apart from the face of land 40～80cm.
In the step 3), on the lime soil layer, by machine drilling, steel pipe soil compaction or manpower excavation a hole is set.Operating principle of the present utility model:
(1) wet surface layer of soft foundation water content height, intensity is low.Topsoil and quicklime are mixed and stirred, and strong interaction takes place with soil in lime, and its Main physical and chemical reaction comprise ion-exchange, Ca (OH)
2Crystallization, carbonating and pozzolanic reaction.Ca (OH)
2Ca after the disassociation
2+With the K on the clay colloidal solid counter-ion layet
+, Na
+After ion-exchange takes place, make the colloid adsorption layer weaken, colloidal solid takes place coalescent, and this is the main cause that early stage strength of lime soil forms.Ca (OH)
2With the hydrated crystal that the water effect forms soil particle cementation is become whole, thereby improve the water stability of rendzinas.And the CaCO that forms
3The pozzolanic reaction of the carbonation reaction of process and formation calcium silicates and calcium aluminate process is strength of lime soil and stability-enhanced deciding factor.The initial stage of dirt compound shows as that plasticity reduces, optimum moisture content increases, maximum dry density reduces etc.; Later stage changes the formation that shows as crystal structure, thereby the intensity of rendzinas and stability are improved.Under the situation that quality and the dosage of soil property and lime are determined, the condition that takes care of health and the length of time also are the key factors that influences strength of lime soil and stability.Rendzinas shallow-layer processing method forms crust layer at foundation surface, improves bearing capacity of foundation soil, reduces foundation settlement.Simultaneously, the also operations of marching into the arena such as convenient construction vehicle, facility of the formation of crust layer.
(2) permeable concrete is to be made through specially-shaped technology in specific proportions by the gathering materials of specific grating, cement, reinforcing material, Admixture and water etc.The porosity of permeable concrete is between 10%～25%, and the scope of water/binder ratio is 0.32～0.40, can draw the match ratio of each composition of permeable concrete according to mixing proportion design method.Cement is 32.5 grades or 42.5 grades of portland cements; Admixture is water reducing agent, and volume is 0～1.1%; Gather materials adopt rubble (particle diameter be 0.60～1.18mm, 2.36～4.75mm, 4.75～9.50mm, 9.5～16mm) or cobble (particle diameter is 2.36～4.75mm).To by the load weighted cement of match ratio and gather materials to mix and stir, and add and continue to add water and water reducing agent after water stirs, and adopt compacting or vibro-moulding process to make test specimen.During compression moulding punching block is gone in the weighing of permeable concrete compound, extrusion forming, closed mould curing demoulding after 3 hours, (temperature is 20 ± 3 ℃ to covered with plastic film under standard conditions, relative humidity is more than 90%) maintenance is to 24h, covered with plastic film still after the watering, the 28 day length of time of standard curing; To newly mix the mixture weighing during vibration moulding and go into the plastics mould, the moulding of vibrating, airtight maintenance form removal after 3 days, again with plastic foil sealing, maintenance to 28 day length of time under standard conditions.The concrete of the cellular structure that contains a large amount of connectivity holes (usually between 5%～30% and mostly be the macropore that diameter surpasses 1mm) between skeleton gathers materials, guaranteeing that its compressive strength is generally at 3.5MPa～28MPa under certain water permeability situation, flexural strength is generally at 1MPa～3.8MPa.The transmission coefficient of pervious concrete is generally between 2.0mm/s～5.4mm/s, have in addition reach 1.2cm/s.The proportioning characteristics of pervious concrete are to adopt simple grain level coarse aggregate as skeleton, cement paste or the mortar thin layer that adds a small amount of fines are wrapped in the surface of coarse aggregate particle, as the glued layer between the particles of aggregates, form skeleton---the porous concrete material of gap structure.
Experimental study shows that the intensity of permeable concrete and water permeability are a pair of paradox, and this disappears, and that is long, as shown in Figure 1.In engineering design, should determine the combination of best intensity and permeability according to specific requirement.
Figure 2 shows that accumulated deformation is with the change curve of the degree of depth in different (1 year, 2 years and the 10 years) natural grounds constantly in the back that is open to traffic.As seen accumulated deformation is very fast with the depth attenuation more than underground 5m, and rate of decay slows down gradually under it, illustrates that the ground cumulative settling is mainly caused by the above soil body accumulated deformation of underground 5m under the action of traffic loading, so the long 4～5m that gets of permeable concrete stake stake.350～600mm should be got in the stake footpath, and pilespacing should be got 3～5 times of stake footpaths, satisfies bearing capacity of foundation soil and settlement request.Permeable concrete stake not only water permeability is strong, and than the intensity height of granular piles such as sand-gravel pile, this makes the transmission of overlying burden power in pile body and the discharging consolidation PROCESS COUPLING of wet subgrade be in the same place, mutually promote, both accelerated wet soft foundation consolidation speed, reduce cumulative settling, improved wet subgrade bearing capacity again.The rendzinas shallow-layer is handled the comprehensive method for processing foundation that combines with permeable concrete stake deep level of processing can significantly reduce soft foundation cumulative settling under the low embankment.
Figure 3 shows that during the road operation at underground 0.7m and 1.2m degree of depth place's natural ground and rendzinas-permeable concrete stake and comprehensively punish the excess pore water pressure of ground correspondence with the change curve of vehicular load effect times N.As seen, compare with natural ground, rendzinas-permeable concrete stake is comprehensively punished excess pore water pressure in the ground and is starkly lower than natural ground, and this is because the permeable concrete stake has good water permeability, the excess pore water pressure that the traffic loading that can dissipate rapidly causes.
Figure 4 shows that the change curve of ground cumulative settling with the time that is open to traffic.As seen, the ground cumulative settling is very fast in the initial stage development that is open to traffic, and slows down gradually then.Rendzinas ground cumulative settling after the permeable concrete stake is handled obviously reduces.Illustrate that the cumulative settling that rendzinas-permeable concrete stake method of comprehensively punishing causes traffic loading has the obvious suppression effect.Therefore, rendzinas-permeable concrete stake method of comprehensively punishing has significant decompression to wet subgrade under the low embankment and falls heavy effect.In addition, according to principle of effective stress, the interior excess pore water pressure of the soil body dissipates more fast, and the intensity of the soil body improves more fast, and foundation soil will be born more subsidiary stress, thereby can suitably reduce the replacement ratio of pile body when composite foundation designs.To be drained by the hardcore bed of laying on the composite foundation by the water that the permeable concrete stake is oozed out, hardcore bed can also be adjusted stress ratio.
The beneficial effects of the utility model are:
The comprehensive method for processing foundation that the utility model adopts the punishment of rendzinas shallow-layer and permeable concrete stake deep layer to reinforce is controlled the low embankment that traffic loading causes (≤1.5m) wet subgrade cumulative settling down.The permeable concrete stake is rigidity and intensity height not only, and water permeability is strong, integrates high-bearing performance and high drainage performance, can effectively reduce wet subgrade cumulative settling, improves wet subgrade intensity.
Description of drawings
Fig. 1 is the relation curve of permeable concrete compressive strength and transmission coefficient;
Fig. 2 is that accumulated deformation is with the change curve of the degree of depth;
Fig. 3 a be 0.7m degree of depth place excess pore water pressure with the change curve of number of loading, Fig. 3 b is that 1.2m degree of depth place excess pore water pressure is with the change curve of number of loading;
Fig. 4 is that cumulative settling is with the time changing curve that is open to traffic;
Fig. 5 a is the square of the permeable concrete stake schematic diagram that lays out pile, and Fig. 5 b is the triangle of the permeable concrete stake schematic diagram that lays out pile;
Fig. 6 is structural representation of the present utility model;
1. lime soil layers wherein, 2. permeable concrete stake, 3. hardcore bed.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further set forth, should be noted that following explanation only is in order to explain the utility model, its content not to be limited.
A kind of rendzinas-permeable concrete pile composite foundation comprises lime soil layer 1 and disperses to be embedded in the permeable concrete stake 2 of lime soil layer below 1 that hardcore bed 3 is laid on the surface of described lime soil layer 1.
Described permeable concrete stake 2 is some rows, and each row's quantity equates, and cover off, the whole arranged in squares that forms.
Described permeable concrete stake 2 is some rows, side from described composite foundation, the permeable concrete stake 2 of each even rows is arranged on the center line of two adjacent permeable concrete stake 2 lines of odd number row, and each permeable concrete stake 2 forms triangular arrangement with adjacent two permeable concrete stakes 2.
The thickness of described hardcore bed 3 is 15～30cm.
The stake footpath of described permeable concrete stake 2 is 350～600mm, and stake is long to be 4～5m, and the pilespacing of two adjacent permeable concrete stakes 2 is 3～5 times of stake footpath.
The processing method of above-mentioned composite foundation, concrete steps are as follows:
1) prefabricated permeable concrete stake: formwork on compacting, smooth stake processed place, build permeable concrete then, treat the lifting of maintenance to 70% intensity, and continue the permeable concrete stake 2 that maintenance obtains 100% intensity that transportation is stacked standby;
2) be that 5～7% quicklime is handled wet subgrade shallow-layer and formed lime soil layer 1 with the quality volume;
3) at lime soil layer 1 hole is set, the aperture in described stake hole is than the big 20cm in stake footpath;
4) the permeable concrete stake 2 that step 1) is obtained is arranged in the hole, space landfill coarse sand around it; Square or triangular arrangement are adopted in permeable concrete stake 2;
5) lay hardcore bed 3 on lime soil layer 1 surface.
In the step 1), the concrete crushing strength of described permeable concrete stake 2 is more than or equal to 20MPa, and transmission coefficient is more than or equal to 2mm/s.
Step 2) in, described quicklime be fresh quicklime or will concentrate stacking after quicklime cleared up in 7～10 days before use and sieve.
Step 2) in, described shallow-layer refers to that wet subgrade is apart from the face of land 40～80cm.
In the step 3), on lime soil layer 1, by machine drilling, steel pipe soil compaction or manpower excavation a hole is set.
Test example 1: the rendzinas of depth of fill 1.0m-permeable concrete composite foundation
Certain Highway Foundation be the Yellow River towards alluvial soil, soil property is based on low liquid limit silt, is low liquid limit clay secondly, the part accompanies the high liquid limit clay layer.For low liquid limit silt, water content is 25%, void ratio be 0.7 index of plasticity about 10, soil compression coefficient at 0.1～0.5MPa
-1Between, compressibilty soil in the genus.Low liquid limit clay water content 22～35%, void ratio 0.60～0.89.This Expressway Embankment height is 1.0m.During construction, be that 5% quicklime carries out shallow-layer to face of land 40cm and handles with the quality volume earlier, in foundation surface formation lime soil layer 1, the permeable concrete stake 2 of constructing again.
Arranged in squares is adopted in permeable concrete stake 2.2 footpaths of permeable concrete stake are 400mm, and pile spacing is 1.6m.Permeable concrete compressive strength is not less than 20MPa, and transmission coefficient is not less than 2mm/s, and all pile body error of perpendicularitys are not more than 1.5%.
Construct preceding place needs clear list processing, carry out draw water, desilting and leveling work.Lay hardcore bed 3 at foundation surface, thickness is 30cm.
Test example 2: the rendzinas of depth of fill 1.5m-permeable concrete composite foundation
Certain Highway Foundation is made up of two-layer weak soil, and upper strata 11m is grey mud, water content 65～69%, void ratio 1.81～1.91; The 4m of lower floor is mud matter lam, water content 46%, void ratio 1.25.15m is following to be the basement rock weathered layer.Planning to build the Expressway Embankment height is 1.5m.During construction, 7% quicklime with the quality volume carries out the shallow-layer processing to ground 60cm earlier, forms lime soil layer 1, the permeable concrete stake 2 of constructing again at foundation surface.
Triangular arrangement is adopted in permeable concrete stake 2.2 footpaths of permeable concrete stake are 500mm, and pile spacing is 2.5m; Pile body compressive strength is not less than 20MPa, and transmission coefficient is not less than 2mm/s, and all pile body error of perpendicularitys are not more than 1.5%.
Construct preceding place needs clear list processing, carry out draw water, desilting and leveling work.Lay hardcore bed 3 at foundation surface, thickness is 20cm.
Though above-mentionedly by reference to the accompanying drawings the specific embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (5)
1. rendzinas-permeable concrete pile composite foundation is characterized in that, comprises that lime soil layer and dispersion are embedded in the following permeable concrete stake of lime soil layer, and hardcore bed is laid on the surface of described lime soil layer.
2. composite foundation according to claim 1 is characterized in that, described permeable concrete stake is some rows, and each row's quantity equates, and cover off, the whole arranged in squares that forms.
3. composite foundation according to claim 1, it is characterized in that, described permeable concrete stake is some rows, side from described composite foundation, the permeable concrete stake of each even rows is arranged on the center line of two adjacent permeable concrete stake lines of odd number row, each permeable concrete stake and adjacent two permeable concrete stakes formation triangular arrangement.
4. composite foundation according to claim 1 is characterized in that, the thickness of described hardcore bed is 15～30cm.
5. composite foundation according to claim 1 is characterized in that, the stake footpath of described permeable concrete stake is 350～600mm, and stake is long to be 4～5m, and the pilespacing of two adjacent permeable concrete stakes is 3～5 times of stake footpath.
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| CN 201320146122 CN203145032U (en) | 2013-03-27 | 2013-03-27 | Limestone soil-pervious concrete pile composite foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195051A (en) * | 2013-03-27 | 2013-07-10 | 山东大学 | Limestone soil and pervious concrete pile composite foundation and treatment method thereof |
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2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103195051A (en) * | 2013-03-27 | 2013-07-10 | 山东大学 | Limestone soil and pervious concrete pile composite foundation and treatment method thereof |
| CN103195051B (en) * | 2013-03-27 | 2015-07-15 | 山东大学 | Limestone soil and pervious concrete pile composite foundation and treatment method thereof |
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|---|---|---|---|
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20150327 |
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