CN102605797A - Peg and plate shell structural technology for controlling deformation of soft soil foundation under embankment - Google Patents
Peg and plate shell structural technology for controlling deformation of soft soil foundation under embankment Download PDFInfo
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- CN102605797A CN102605797A CN2012101057099A CN201210105709A CN102605797A CN 102605797 A CN102605797 A CN 102605797A CN 2012101057099 A CN2012101057099 A CN 2012101057099A CN 201210105709 A CN201210105709 A CN 201210105709A CN 102605797 A CN102605797 A CN 102605797A
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Abstract
The invention discloses peg and plate shell structural technology for controlling deformation of a soft soil foundation under an embankment. The peg and plate shell structural technology is characterized by including steps of flattening a construction field, paving a cushion layer according to hardness of a surface soil layer, and leading the surface soil layer to be capable of bearing construction machinery; pouring pegs on the spot, or driving the prefabricated pegs into the foundation, and mounting formworks on the edges of the embankment; placing a reinforcement cage and leading the reinforcement cage to be connected with connecting reinforcements on the pegs; pouring concrete plates; and building the embankment on the concrete plates after the concrete plates are maintained to achieve proper strength. The lengths of the pegs range from 2m to 5m, pitches among the pegs range from 3m to 10m, the pegs can be arranged in a quincunx or square manner, the thicknesses of the reinforcement concrete plates range from 30cm to 50cm, and the widths of the reinforcement concrete plates are equal to the width of the bottom of the embankment. The peg and plate shell structural technology eliminates the problem that the 'pot-bottom-shaped' differential settlement is produced on the cross section of an embankment treated by a conventional method, longitudinal cracks of the foundation are avoided, buckling failure of a slope of the foundation is also avoided, the earthwork volume of filled soil of the foundation is reduced, settlement is low after construction, work period is short, and manufacturing cost is low.
Description
Technical field
The invention belongs to technical field of civil engineering, particularly the stub of soft soil foundation Deformation control under the embankment-plate and shell structure technology.
Background technology
China is just carrying out large-scale infrastructure construction, and most of engineering construction is positioned at coastal and lake, the ground soft clay area of China.Building highway, high-speed railway, river dike etc. need be handled soft soil foundation on soft soil foundation, with the control settlement after construction.For high-grade embankment; Settlement after construction is defined as pavement construction and finishes the sedimentation in 15 years afterwards; According to " highway subgrade design specifications " (JTG D30-2004); The settlement after construction of end of the bridge section is controlled at 10cm, and the settlement after construction of end of the bridge changeover portion is controlled at 20cm, and the settlement after construction in general highway section is controlled at 30cm.When natural ground settlement after construction can not meet the demands, carrying out ground processing two class methods commonly used in the past was consolidation and compound foundation method.On deep soft soil foundation, build high-grade embankment, after the employing consolidation is handled, original no drainage channel in the ground; Consolidation settlement is very little; Adopt band drain in ground, to form drainage channel on the contrary, therefore often do not reach fixed fully, in pavement construction finishes certain hour, produce bigger consolidation settlement on the contrary at the construction period soil body; Cause the road surface settlement after construction to increase, result of use is not good.And adopt compound foundation method to handle to be divided into two types of flexible pile composite foundation and rigid pile composite foundations; Flexible pile such as cement mixing method (slurry, wet shot stake), sand pile and broken stone pile etc.; Rigid pile has the CFG stake; Pile for prestressed pipe (PHC stake) and the cast-in-place thin-wall pipe pile of major diameter (PCC stake) etc., flexible pile composite foundation are generally handled 15 meters of below grounds only with interior soft foundation, should not be used for the deep layer processing soft soil; And owing to the flexible nature of stake, its pile body still has sedimentation to produce in reinforcing scope; Rigid pile is to handle one of feasible method of deep layer weak soil, and consolidation effect is good, but ground is handled the cost height.
In addition, for the high-grade embankment on the deep soft soil foundation,, be easy to generate distortion because the embankment filled soil load is a kind of flexible load.No matter adopt consolidation or adopt compound foundation method to carry out the ground processing; The problem that all exists the subsidiary stress at embankment center and embankment edge to vary in size; The subsidiary stress at general embankment center is greater than the embankment edge, and the settling amount that makes the embankment center produce is bigger than embankment edge, thereby makes the face of land produce the differential settlement of " the bottom of a pan " shape; Cause highway to produce longitudinal crack when serious, the comfortableness and the safety of influence driving.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective, provide that a kind of cost is low, quick construction, do not produce stub-plate and shell structure technology of soft soil foundation Deformation control under the embankment of differential settlement of " the bottom of a pan " shape.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is:
The stub of soft soil foundation Deformation control under a kind of embankment-plate and shell structure technology is characterized in that: smooth construction plant, and look surface soil layer soft or hard situation and lay bed course, make to reach the construction machinery requirement of marching into the arena; The cast on-site stub perhaps is driven into ground with precast piling, and the length of stub is 2 ~ 5m, and pile spacing is 3 ~ 10m, can be arranged to quincunx or square; The mounting template at the embankment edge; Place reinforcing cage, reinforcing cage links to each other with connecting reinforcement on the stub; Concreting plate, steel concrete plate thickness are 30 ~ 50cm, and width equals the embankment bottom width; After treating that the concrete slab maintenance reaches intensity, railway embankment using above that; Or the little beam of deflection deformation-shell combining structure, concrete-steel plate are set on stub mix other plate and shell structures such as combining structure, ribbed steel shell structure, railway embankment using on plate and shell structure.
Said cast-in-place stub solidifies preceding top at material of body of a pile and inserts connecting reinforcement, and connecting reinforcement stretches out stake top 10 ~ 30cm;
Reserve connecting reinforcement when said precast piling is prefabricated in the factory, connecting reinforcement stretches out stake top 10 ~ 30cm;
Said stub top can be provided with cover plate.
Said stub is positioned at that stake in the middle of the embankment is long can be longer than the stake at embankment edge, and the stake end is positioned at the weak soil layer.
Said stub can be the circular cross-section stake, also can be the abnormity stake, such as circular stake, pile tube, X-shaped stake, the stake of Y shape etc.
Said stub end face is provided with pile cover.
Advantage of the present invention and effect are:
Sheet pile technology of the present invention belongs to the shallow foundation category, and is more much lower than deep foundation costs such as general stake raft, stake plates, and easy construction, can directly be pressed into during the construction pile foundation, do not need pile driver, and speed of application is fast.
The armored concrete slab of stub and rigidity is set under embankment filled soil; The bending rigidity of armored concrete slab itself is very big; Therefore stub is played a supporting role to concrete slab itself, is out of shape for a short time, has eliminated the relative settlement at embankment edge and embankment center; Make the whole evenly sinking of embankment, avoided roadbed to produce longitudinal crack.
Because concrete slab intensity is very high, so unstable failure can not take place in side slope of embankment, and side slope is steepening suitably, thus the side that has reduced embankment filled soil measure, saved construction costs.
Adopt stub and rigid slab to replace conventional method for processing foundation, make the embankment flexible load become rigid load, produce bulk deformation, the indifference sedimentation does not need ground to handle and eliminates relative settlement, has therefore saved expensive ground disposal cost.
Compare with consolidation, the present invention is because discharging consolidation is slow, behind the worker in the certain hour sedimentation little, promptly settlement after construction is little.Compare with compound foundation method, cost of the present invention is low.Duration of the present invention is short, only considers to banket the duration, and particularly suitable is with general highway section on the deep soft soil foundation.
Be described in detail below in conjunction with the accompanying drawing specific embodiments of the invention.Protection scope of the present invention is not exceeded with the specific embodiment, but is limited claim.
Description of drawings
Fig. 1 rigidity sheet pile technology of the present invention sketch map;
Fig. 2 the present invention and natural ground and band drain scheme sedimentation ~ time graph comparison diagram
Fig. 3 the present invention and natural ground and band drain scheme embankment cross section settlement after construction comparison diagram
Among the figure: 1 is soft foundation, and 2 is stub, and 3 is armored concrete slab, and 4 is geotextiles, and 5 is embankment, and 6 is ground surface.
The specific embodiment
Like Fig. 1, shown in 2 and 3, the stub of soft soil foundation Deformation control under a kind of embankment-plate and shell structure technology, smooth construction plant is looked surface soil layer soft or hard situation and is laid bed course earlier, makes to reach the construction machinery requirement of marching into the arena.In soft foundation (1), set stub (2) earlier; Long 2 ~ the 5m of stub (2); Pile spacing is 3 ~ 10m, can be arranged to quincunxly or square, and stub (2) can be various types of rigid pile such as circle, X-shaped, Y shape, cross; Adopt cast-in-place or prefabricated form, stub is provided with cover plate on (2).The long variation of stub (2) stake; Being positioned at that stake in the middle of the embankment (5) is long can be longer than the stake at embankment (5) edge; Because stake is shorter; Therefore do not penetrate the weak soil layer, the stake end is positioned at the weak soil layer, and stub (2) mainly plays supporting armored concrete slab (3) and reduces the effect of the amount of deflection of armored concrete slab (3).Go up layout armored concrete slab (3) at stub (2), armored concrete slab (3) adopts on-the-spot integrated poured mode, the generally mounting template at the embankment edge; Place reinforcing cage, reinforcing cage links to each other with connecting reinforcement on the stub, and connecting reinforcement stretches out stake and pushes up a 10 ~ 30cm; Concreting plate, steel concrete plate thickness are 30 ~ 50cm, and width equals the embankment bottom width.After treating that concrete curing reaches intensity, go up railway embankment using (5) at armored concrete slab (3), embankment (5) side slope can adopt geotextiles (4) parcel.Armored concrete slab (3) surface can flush with ground surface (6), or is positioned under the ground surface (6).Also available other structures of armored concrete slab of the present invention (3) replace, like beam-shell combining structure, concrete-steel plate combination construction, ribbed steel shell structure etc., as long as it is little to satisfy this plate and shell structure deflection deformation under the embankment load action.
This embodiment calculates the embankment on the deep soft soil foundation, and in the calculating: the embankment bottom width is taken as 38m, and the embankment top width is taken as 29m; The embankment filled soil height is 3m, and thickness of soft soil is 15m, calculates the long 3m of stub stake; Thickness of slab 40cm, band drain length 15m, spacing of prefabricated drain 1.3m.Contrasted the settlement Control effect (Fig. 2 and Fig. 3) of the present invention and consolidation scheme and natural ground.Result of calculation shows: after beating band drain in the ground, the rate of settling is accelerated greatly, and therefore in same consolidation time, the settling amount of this processing method is maximum; Natural ground is because the weak soil layer depth is thick, so consolidation rate is slower, the sedimentation development trend than adopt band drain slowly many; And after adopting the stake plated construction to handle, settlement of foundation is littler.Therefore, for deep soft soil foundation, be not that the many more drainage channels of setting are good more; On the contrary, do not have drainage channel in the ground originally, ground consolidation is slow; Settlement after construction is little, ground consolidation is speeded up after drainage channel is arranged, but can not guarantee to reach fixed fully in the construction period; Therefore cause settlement after construction to increase, play reaction.From Fig. 3 settlement after construction result of calculation illustrative problem more, the supposition construction period is 1 year (365 days) among the figure, and the sedimentation that deducts the 1st year with the sedimentation of the 16th year (5840 days) is settlement after construction.The result can find out from figure, and the settlement after construction after embankment center sheet pile is handled is 13cm, and the settlement after construction that natural ground is not handled is 23cm, and adopting band drain to handle the back settlement after construction is 45cm, and the effect that visible stake plate is handled is best.The result also shows among the figure, adopt the stake plate to handle after, the relative settlement at embankment center and embankment edge is minimum, does not almost have relative settlement, further verified sheet pile handle after the effect of embankment bulk deformation; And that natural ground and band drain are handled the relative settlement at embankment center, back and embankment edge is bigger, reaches 20cm respectively with more than the 30cm, thereby makes the differential settlement of embankment cross section generation " the bottom of a pan " shape, causes the possibility of road surface generation longitudinal crack.
Can know that from above analysis the stub of soft soil foundation Deformation control under the embankment-plate and shell structure technology has effectively been controlled the embankment settlement after construction, the embankment cross-sectional deformability is even, and speed of application is fast, cost is low, is the optimization technique of handling general highway section deep soft foundation.
Claims (5)
1. the stub of soft soil foundation Deformation control under the embankment-plate and shell structure is technological; It is characterized in that: precast piling is driven into soft soil foundation; Perhaps cast on-site stub, the length of stub is 2 ~ 5m, being positioned at the long ratio of stub stake in the middle of the embankment, to be positioned at the stub stake at embankment edge long; Pile spacing is 3 ~ 10m, can be arranged to quincunx or square; The mounting template at the embankment edge; Place reinforcing cage, reinforcing cage links to each other with connecting reinforcement on the stub; Concreting plate, steel concrete plate thickness are 30 ~ 50cm, and width equals the embankment bottom width; After treating that the concrete slab maintenance reaches intensity, railway embankment using above that.
2. the stub of soft soil foundation Deformation control under the embankment according to claim 1-plate and shell structure technology is characterized in that: cast-in-place stub solidifies preceding top at material of body of a pile and inserts connecting reinforcement, and connecting reinforcement stretches out stake top 10 ~ 30cm.
3. the stub of soft soil foundation Deformation control under the embankment according to claim 1-plate and shell structure technology is characterized in that: reserve connecting reinforcement when precast piling is prefabricated in the factory, connecting reinforcement stretches out stake top 10 ~ 30cm.
4. the stub of soft soil foundation Deformation control under the embankment according to claim 1-plate and shell structure technology, it is characterized in that: the stub top is provided with cover plate.
5. the stub of soft soil foundation Deformation control under the embankment according to claim 1-plate and shell structure technology, it is characterized in that: stub can be the circular cross-section stake, also can be circular stake, pile tube, X-shaped stake, the stake of Y shape.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210105709.9A CN102605797B (en) | 2012-04-12 | 2012-04-12 | Peg and plate shell structure for controlling deformation of soft soil foundation under embankment |
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| CN201210105709.9A CN102605797B (en) | 2012-04-12 | 2012-04-12 | Peg and plate shell structure for controlling deformation of soft soil foundation under embankment |
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| CN102605797A true CN102605797A (en) | 2012-07-25 |
| CN102605797B CN102605797B (en) | 2014-04-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106592568A (en) * | 2016-12-28 | 2017-04-26 | 浙江理工大学 | Ground uniform settlement structure and construction method |
| CN110952386A (en) * | 2019-12-17 | 2020-04-03 | 同济大学 | Micro pile reinforcing method for controlling transverse uneven settlement of high-speed rail wide embankment |
| CN111335308A (en) * | 2020-04-25 | 2020-06-26 | 开封市通达公路勘察设计有限公司 | Method for processing passage under soft foundation by using small prefabricated pile group |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211052A (en) * | 2020-09-29 | 2021-01-12 | 中南大学 | Long and short pile-plate structure for controlling uneven settlement of transition section of highway and construction method thereof |
Citations (4)
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| JP2006045793A (en) * | 2004-07-30 | 2006-02-16 | Sekkeishitsu Soil:Kk | Structure of foundation |
| RU2006131655A (en) * | 2006-09-05 | 2008-03-10 | Федеральное государственное унитарное предпри тие"Научно-исследовательский центр "Строительство", ФГУП "НИЦ "Строительство" (RU) | METHOD FOR ESTABLISHING A PLATE AND PILED BASE |
| CN101368383A (en) * | 2008-09-11 | 2009-02-18 | 中国科学院武汉岩土力学研究所 | Method for treating soft soil roadbed by artificial composite crust layer |
| CN101440622A (en) * | 2008-12-17 | 2009-05-27 | 何志红 | CFG pile, pipe pile embankment reinforcement system and construction method thereof |
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2012
- 2012-04-12 CN CN201210105709.9A patent/CN102605797B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006045793A (en) * | 2004-07-30 | 2006-02-16 | Sekkeishitsu Soil:Kk | Structure of foundation |
| RU2006131655A (en) * | 2006-09-05 | 2008-03-10 | Федеральное государственное унитарное предпри тие"Научно-исследовательский центр "Строительство", ФГУП "НИЦ "Строительство" (RU) | METHOD FOR ESTABLISHING A PLATE AND PILED BASE |
| CN101368383A (en) * | 2008-09-11 | 2009-02-18 | 中国科学院武汉岩土力学研究所 | Method for treating soft soil roadbed by artificial composite crust layer |
| CN101440622A (en) * | 2008-12-17 | 2009-05-27 | 何志红 | CFG pile, pipe pile embankment reinforcement system and construction method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106592568A (en) * | 2016-12-28 | 2017-04-26 | 浙江理工大学 | Ground uniform settlement structure and construction method |
| CN106592568B (en) * | 2016-12-28 | 2018-06-26 | 浙江理工大学 | A kind of terrace uniform settlement structure and construction method |
| CN110952386A (en) * | 2019-12-17 | 2020-04-03 | 同济大学 | Micro pile reinforcing method for controlling transverse uneven settlement of high-speed rail wide embankment |
| CN111335308A (en) * | 2020-04-25 | 2020-06-26 | 开封市通达公路勘察设计有限公司 | Method for processing passage under soft foundation by using small prefabricated pile group |
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| CN102605797B (en) | 2014-04-09 |
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