CN203334154U - Embankment structure for preventing bearing platform of pile foundation from stretching in roadbed under viaduct - Google Patents
Embankment structure for preventing bearing platform of pile foundation from stretching in roadbed under viaduct Download PDFInfo
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- CN203334154U CN203334154U CN201320329291XU CN201320329291U CN203334154U CN 203334154 U CN203334154 U CN 203334154U CN 201320329291X U CN201320329291X U CN 201320329291XU CN 201320329291 U CN201320329291 U CN 201320329291U CN 203334154 U CN203334154 U CN 203334154U
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Abstract
The utility model relates to an embankment structure for preventing the bearing platform of a pile foundation from stretching in a roadbed under a viaduct. The structure is mainly composed of a roadbed treatment pile, a pile top vertical-horizontal connection cover beam, a light-weight filler layer, a solidified soil backfill layer and a transversal reinforcement layer; the roadbed treatment pile is arranged in the roadbed, and connection reinforcement bars are arranged on a pile top in advance; the vertical-horizontal connection cover beam is poured on the pile top of the roadbed treatment pile, and connection with a pile body is reinforced by the connection reinforcement bars on the pile top; and the roadbed is backfilled with solidified soil and light-weight fillers layer by layer, and the transversal reinforcement layer is arranged in the roadbed. According to the embankment structure disclosed by the utility model, the integrity of the embankment structure under the viaduct can be effectively improved, the performance of the fillers in the roadbed can be improved, the weight of the fillers can be reduced, and the problem that a road surface generates longitudinal cracks and waves due to the non-uniform subsidence of the roadbed caused when the bearing platform stretches in the roadbed can be solved; and the embankment structure has good technical and economic benefits.
Description
Technical field
The utility model belongs to the ground process field, relate to subgrade deformation combination control structure under a kind of viaduct, particularly under a kind of viaduct, pile foundation support table stretches into the embankment structure of roadbed, this structure has the multiple advantages such as the supporting capacity that improves subgrade soils, the globality that strengthens roadbed filling, minimizing filler weight, be applicable in soft clay area highway, town road roadbed under viaduct and process engineering, be particularly useful for the viaduct cushion cap and stretch into the roadbed that roadbed easily causes generation crack, road surface and process.
Background technology
Expansion day by day along with Urban traffic demand, viaduct, overpass bridge proportion in Urban Traffic Planning is increasing, but because central authorities' isolation greenbelt width of urban road is less, when design pile foundation support table size is larger, the bridge pile foundation cushion cap tends to stretch in the roadbed of below, road travel road under viaduct, has a strong impact on the globality of road structure.Simultaneously, due to China coast, all provinces are distributed with weak soil comparatively widely, it has that moisture content is high, compressibilty is large, poor permeability, highly sensitive, intensity is low and characteristics in uneven thickness etc., and road structure is prone to comparatively significantly settlement after construction under the action of traffic loading of top.
Engineering is actual in a large number shows, construction is in viaduct, the bridge crossing engineering of soft clay area, due to the bridge pile foundation sedimentation than little, subgrade settlement is large, if subgrade deformation under viaduct is lacked to effective control measure and structure, will give constructing benefits and the driving many adverse effects of mass formation or the potential safety hazard of road, as subgrade soils sedimentation meeting produces the side direction frictional resistance to bridge pier, change the stress performance of pile body; The differential settlement distortion of roadbed can cause the engineering diseases such as longitudinal crack or pavement track occurring near the cushion cap edge, shortens the curing period of road; The road structure distortion can affect the performance of road structure, and then affects comfortableness, the reduction road passage capability of driving, even causes traffic safety hidden danger.
The measure of the problems referred to above of each department reply at present mainly contains overlay method, the displacement of excavation light material, slip casting method etc.The overlay method overlays ground surface material more than former road crust, though this method can make up rapidly the differential settlement between highway section, improve fast the current condition of highway, but because it fails to improve the load-carrying properties on basis, bottom, add overlay and can increase the weight of the weight of road structure, it is unfavorable for settlement of soft foundation, to control, and be prone to all the more more vicious circle of sedimentation of paving, and the engineering cost repeatedly overlayed is also higher.Slip casting method is to be pressed into a certain amount of cement paste by Grouting Pipe to reinforcing area, improve the supporting capacity of roadbed by solidifying subgrade soil, but this reinforcement measure be take and reinforced shallow layer soft ground or the top roadbed is purpose, weak soil is difficult to slip casting in darker situation to hardpan relatively, the also more difficult injection embankment center, wider highway section to roadbed, simultaneously the grouting and reinforcing ground as grouting pressure or process control is improper also easily causes slip casting inhomogeneous, causes that road structure inhomogeneous deformation occurs under the overlying burden effect.Light material changes and fills out is to adopt light material to replace original filling for embankment, this method has pretreating effect preferably to overlying burden, the reduction road surface bulk settling that reduces roadbed, but it is higher to play engineering cost when wide-scale adoption, and because the bearing capacity of filler itself is not high, anti-shearing force is poor, the road structure distortion fashion caused by viaduct pile foundation and roadbed subsidence difference in reply is inadequate, especially under Soft Soil.Adopt light material to replace roadbed filling, though can reduce the weight of embankment, but this method is difficult to improve the globality of the zones of different soil body in the roadbed scope, the difficult inhomogeneous deformation amount of coordinating to control roadbed still, and to the soil body bending resistance draw performance to improve effect comparatively limited.Therefore, as adopted the light filler railway embankment using, need improve anti-shearing, the bending resistance of embankment and draw performance.
In sum, at present engineering circles mainly be take and is remedied as main afterwards for the road disease under viaduct and the punishment of subgrade deformation problem, as overlaying method, the displacement of excavation light material and slip casting method etc., these methods have also obtained comparatively desirable punishment effect under certain engineering specifications.But in general, the structure optimization that does not relate to embankment due to these methods is combined, it is limited that it improves effect, is difficult to fundamentally solve the compatibility of deformation problem of embankment fill material under bridge pier, even there will be and more remedy the vicious circle that problem is more serious.
In view of above-mentioned technical background, stretch in order better to prevent and treat pile foundation support table under viaduct the road disease problem that roadbed may cause, improve the constructing benefits of road, need at present a kind of rational road under bridge embankment structure of invention badly, make it both can effectively reduce the deflection of subgrade soil under viaduct, improve the performance of roadbed filling, also can improve the globality of embankment fill material, reduce the weight of filler.
Summary of the invention
The purpose of this utility model be by reinforcing road bed, reduce overlying burden and strengthen three kinds of settlement Control measures of road structure cooperative bearing performance to combine, invent and a kind ofly can effectively prevent and treat road differential settlement under viaduct, improve subgrade defect control structure under the novel viaduct of roadbed filling performance.
In order to realize above-mentioned technical purpose, the utility model has adopted following technical scheme:
Under a kind of viaduct, pile foundation support table stretches into the embankment structure of roadbed, it is characterized in that described structure mainly consists of to connection bent cap, light filler layer, solidified earth backfill layer, transversal reinforcement layer in length and breadth roadbed processing stake, stake top; Roadbed is set in roadbed and processes stake, the default connecting reinforcement in stake top; Build in roadbed processing stake stake top to connecting bent cap in length and breadth, strengthen being connected with pile body by stake top connecting reinforcement; Roadbed adopts solidified earth and light filler back-filling in layers, inside establishes the transversal reinforcement layer.
It is weak soil compaction, non-Squeezing Soil Pile that described roadbed is processed stake, pile body is apart from viaduct cushion cap edge 500mm ~ 800mm, penetrate flabbily basic unit, squeeze into bearing stratum 500mm ~ 2000mm, pile spacing is 3000mm ~ 4000mm, to uniformly-spaced arranging, stake is long optionally to be reduced or remains unchanged according to the smooth-going transition principle of sedimentation in length and breadth.
The stake top is steel concrete integral cast-in-situ bent cap to connecting bent cap in length and breadth, is groined type, and stake roof rail in edge is extended 600 ~ 1000mm short distance cantilever, and the bent cap width is 1 ~ 2 times that ground is processed stake stake footpath; In bent cap, reinforcing bar is connected with a roadbed processing stake top rebars, and connected mode is that welding or colligation connect.
Described solidified earth backfill layer is formed with the curing compound mix by former roadway excavation soil, is cured to the stake top in length and breadth to connecting square 600mm ~ 1200mm under the bent cap beam, and its thickness is 1500 ~ 3000mm, and curing compound is cement, lime or soil-solidified-agent.
Light filler is air bubble mix light-textured soil, foam beads mix light-textured soil or EPS particle light soil.
The transversal reinforcement layer is high strength reinforcement mesh sheet or steel plastic geogrid, according to the filler compatibility of deformation, requires one or more layers is set.
The job practices that under above-mentioned viaduct, pile foundation support table stretches into the embankment structure of roadbed comprises the following steps:
1) before the construction, prepare: according to design drawing, process construction plant, measure the stake position, draw stake position outline line;
2) soil taking hole forming: boring extracting soil should be aided with in case of necessity mud off or bury casing underground;
3) roadbed is processed pile driving construction: behind clear hole, in pore-forming, the construction ground is processed stake, according to designing requirement, controls the pile body embedded depth, and on the stake top default with in length and breadth to the reinforcing bar that is connected the bent cap connection;
4) dig the backfill solidified earth under: after roadbed processing stake intensity reaches designing requirement, under the mode that adopts hand excavation and mechanical equivalent of light excavation to combine, the road breaking base bankets and pushes up following design elevation to stake, and after the soil body dug out is solidified, layering all spreads and is backfilled to a top;
5) top is in length and breadth to connecting Coping Construction: after backfill has some strength, process the stake topmast of stake at roadbed and establish template, the default reinforcing bar in connection stake top, is built stake and is pushed up in length and breadth to connecting bent cap to the reinforcing bar that is connected bent cap with in length and breadth;
6) fill solidified earth: after the stake top reaches design strength to the connection bent cap in length and breadth, stripping, continue placement in layers and solidify back fill course;
7) the transversal reinforcement layer is laid: after solidified earth has been laid, lay the transversal reinforcement layer, and carry out stretch-draw;
8) light soil that paves: after backfill is solidified in compacting, the light filler layer paves;
9) road surface structare layer construction: according to designing requirement, carry out the road structure construction.
the utlity model has following characteristics and beneficial effect:
(1) adopt weak soil compaction, non-Squeezing Soil Pile to carry out the roadbed processing, can reduce the impact of pile body construction on contiguous viaduct pile foundation support table; Roadbed processing stake stake is long optionally to be reduced or remains unchanged according to the smooth-going transition principle of sedimentation, can better coordinate the distortion of subgrade soils.
(2) adopt integral cast-in-situ to connecting bent cap in length and breadth, and the reserved steel bar by top is connected and is an integral body with weak Squeezing Soil Pile, both can effectively improve the globality of road structure, also can reduce the load of soft layer.
(3) embankment fill material adopts air bubble mix light-textured soil and solidified earth, not only can reduce the weight of filler, and can improve the intensity of embankment fill material, can also reduce embankment earthwork carrying engineering quantity, the characteristics of utilizing air bubble mix light-textured soil to have higher-strength, water resistance and durability also can be saved the construction of the steady layer of water in subgrade construction.
(4) between air bubble mix light-textured soil and solidified earth and in curing soil layer, the transversal reinforcement layer is set, promotes the roadbed shear resistance, can play the reinforcer globality simultaneously, adjust the upper load distribution, coordinate the effect that embankment is out of shape.
In a word, characteristics of the present utility model are, by weak Squeezing Soil Pile, load is reached to the roadbed bearing stratum, by arranging in length and breadth to the globality and the anti-settling ability that connect bent cap enhancing embankment structure, improve the performance of filler by backfill solidified earth, light soil, by the compatible deformation ability of transversal reinforcement layer reinforcer is set, there is technical economic benefit preferably.
The accompanying drawing explanation
Fig. 1 is the elevational schematic view that under viaduct, pile foundation support table stretches into the embankment structure of roadbed;
Fig. 2 is that Fig. 1 is along A-A line sectional drawing;
Fig. 3 is that Fig. 1 is along B-B line sectional drawing;
Fig. 4 is that Fig. 1 is along C-C line sectional drawing;
In figure: 1-roadbed is processed stake, 2-reinforcing cage, 3-Soft Soil Layer, 4-bearing stratum, 5-road surface structare layer, 6-lightweight soil layer, 7-transversal reinforcement layer, 8-solidify back fill course, 9-stake top in length and breadth to connecting bent cap, 10-road kerb, 11-greenbelt, 12-isolated column, 13-bridge pier, 14-pile foundation support table, 15-viaduct pile foundation.
The specific embodiment
The design and construction technical requirements of bridge pile foundation and pile foundation support table, the design and construction technical requirements of weak Squeezing Soil Pile, reinforcing bar stacking, lifting, colligation construction technical requirement, design of concrete and construction technical requirement etc., in present embodiment, be not repeated, emphasis is set forth the embodiment that the utility model relates to structure.
Fig. 1 is the elevational schematic view that under viaduct, pile foundation support table stretches into the embankment structure of roadbed; Fig. 2 is that Fig. 1 is along A-A line sectional drawing; Fig. 3 is that Fig. 1 is along B-B line sectional drawing; Fig. 4 is that Fig. 1 is along C-C line sectional drawing.Shown in Fig. 1 ~ 4, the embankment structure that under viaduct, pile foundation support table stretches into roadbed is mainly processed stake 1, lightweight soil layer 6, transversal reinforcement layer 7, solidified earth back fill course 8, stake top by roadbed and is partly formed to connecting bent cap 9 etc. in length and breadth.
Ground is processed stake 1 and is adopted bored pile, stake footpath 400mm, pile body and viaduct pile foundation support table 14 distances are 500mm, roadbed is processed stake 1 degree of depth of squeezing into bearing stratum and is reduced gradually with the increase of pile body and bridge pile foundation cushion cap 14 distances, wherein to squeeze into the degree of depth of bearing stratum 4 be 1000mm at the long stake stake end, and the degree of depth that stub is squeezed into bearing stratum is 500mm; The concrete strength of pile grade is C30, and it is 16mm that the longitudinal reinforcement of reinforcing cage 2 adopts the HRB335(diameter) indented bars, it is 8mm that spiral bar adopts the HPB300(diameter) plain steel-bar.The length that the longitudinal reinforcement of reinforcing cage 2 stretches out stake top is 200mm, as with in length and breadth to the dowel that is connected bent cap 9; The Specific construction of roadbed processing stake 1 requires to meet the regulation of current specifications, and construction apparatus clear height requires lower than the viaduct height, avoids as much as possible the impact on pile foundation support table 14 and viaduct pile foundation 15 when the ground of constructing is processed stake.
The stake top is steel concrete integral cast-in-situ bent cap to connecting bent cap 9 in length and breadth, and strength grade of concrete is C30, and the width of bent cap in the roadbed filling zone is 500mm, be highly 400mm, to connection, overlook and be groined type in length and breadth, 600mm short distance cantilever is extended on stake top in edge; Adopting the HRB335(diameter to the longitudinal reinforcement that connects bent cap 9 in length and breadth is 16mm) indented bars, it is 8mm that stirrup adopts the HPB300(diameter) plain steel-bar; To the longitudinal reinforcement that connects bent cap 9, with the longitudinal reinforcement colligation of reinforcing cage 2, be connected in length and breadth.
Solidify back fill course 8 by the boring soil body that takes out, under while digging the part soil body and levelling of the land discarded native and curing compound mix together, curing compound is selected Portland cement, the cement strength grade is 32.5MPa, the curing agent ratio example is the 8%(mass ratio).Solidified earth backfill layer thickness is 2000mm, comprise stake top in length and breadth to connect under bent cap 1000mm with 6 ends of lightweight soil layer to stake top in length and breadth to the 600mm that is connected bent cap 9 end faces, and backfill is also done to connecting 9 spaces of bent cap in length and breadth in the stake top,, solidify the protruding layer 8 of backfill and extend to bridge pier 13 surroundings in length and breadth to connecting bent cap 9 end face place paving one deck transversal reinforcement layers 7 on the stake top.
Adopting bored pile is that roadbed is processed pile foundation support table under the viaduct of stake to stretch into the main construction sequence of embankment structure of roadbed as follows:
1) before the construction, prepare.According to design drawing, process construction plant, measure the stake position, draw stake position outline line.
2) soil taking hole forming.Boring extracting soil, should be aided with in case of necessity mud off or bury casing underground, and stake is long to be determined according to designing requirement.
3) roadbed is processed pile driving construction.Behind clear hole, transfer reinforcing cage 2, the end face of reinforcing cage 2 is higher than aperture 400mm, and after reinforcing cage 2 is laid, concreting, form roadbed and process stake 1.
4) dig the backfill solidified earth under.After the intensity of roadbed processing stake 1 reaches designing requirement, under the mode that adopts hand excavation and mechanical equivalent of light excavation to combine, the road breaking base bankets 3 to the following 1000mm of roadbed processing stake 1 end face, after the soil body dug out is solidified, layering all spreads and is backfilled to the stake top, forms the curing back fill course 8 of bottom.
5) the stake top is in length and breadth to connecting Coping Construction.After the curing back fill course 8 of roadbed processing stake 1 bottom reaches design strength, process the stake topmast of stake at roadbed and establish template, template width 500mm, and connect roadbed process the default reinforcing bar at 1 top with in length and breadth to the reinforcing bar that is connected bent cap 9, concreting, form the stake top in length and breadth to connecting bent cap 9.
6) fill solidified earth.After the stake top reaches design strength to connection bent cap 9 in length and breadth, form removal, lay first floor transversal reinforcement layer 7, and carry out stretch-draw, fixing, then back fill course 8 is solidified in placement in layers.
7) the transversal reinforcement layer is laid.After curing back fill course 8 has filled, lay second layer transversal reinforcement layer 7, and carry out stretch-draw, fixing.
8) light soil that paves.The air bubble mix light-textured soil layer 6 of suitable thickness paves.
9) road surface structare layer construction.Carry out the construction of road structure 5 and road kerb 10, greenbelt 11, isolated column 12 etc. according to designing requirement.
Claims (5)
1. under a viaduct, pile foundation support table stretches into the embankment structure of roadbed, it is characterized in that described structure mainly processes stake, stake top by roadbed and form to connecting bent cap, light filler layer, solidified earth backfill layer, transversal reinforcement layer in length and breadth; Roadbed is set in roadbed and processes stake, the default connecting reinforcement in stake top; Build in roadbed processing stake stake top to connecting bent cap in length and breadth, strengthen being connected with pile body by stake top connecting reinforcement; Roadbed adopts solidified earth and light filler back-filling in layers, inside establishes the transversal reinforcement layer.
2. under viaduct according to claim 1, pile foundation support table stretches into the embankment structure of roadbed, it is characterized in that it is weak soil compaction, non-Squeezing Soil Pile that described roadbed is processed stake, pile body is apart from viaduct cushion cap edge 500mm ~ 800mm, penetrate flabbily basic unit, squeeze into bearing stratum 500mm ~ 2000mm, pile spacing is 3000mm ~ 4000mm, and in length and breadth to uniformly-spaced arranging, stake is long optionally to be reduced or remains unchanged according to the smooth-going transition principle of sedimentation.
3. under viaduct according to claim 1, pile foundation support table stretches into the embankment structure of roadbed, it is characterized in that described stake top is steel concrete integral cast-in-situ bent cap to connecting bent cap in length and breadth, be groined type, stake roof rail in edge is extended 600 ~ 1000mm short distance cantilever, and the bent cap width is 1 ~ 2 times that ground is processed stake stake footpath; In bent cap, reinforcing bar is connected with a roadbed processing stake top rebars, and connected mode is that welding or colligation connect.
4. under viaduct according to claim 1, pile foundation support table stretches into the embankment structure of roadbed, it is characterized in that described light filler is air bubble mix light-textured soil, foam beads mix light-textured soil or EPS particle light soil.
5. under viaduct according to claim 1, pile foundation support table stretches into the embankment structure of roadbed, it is characterized in that described transversal reinforcement layer is high strength reinforcement mesh sheet or steel plastic geogrid, according to the filler compatibility of deformation, requires one or more layers is set.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320329291XU CN203334154U (en) | 2013-06-07 | 2013-06-07 | Embankment structure for preventing bearing platform of pile foundation from stretching in roadbed under viaduct |
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| CN201320329291XU CN203334154U (en) | 2013-06-07 | 2013-06-07 | Embankment structure for preventing bearing platform of pile foundation from stretching in roadbed under viaduct |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334357A (en) * | 2013-06-07 | 2013-10-02 | 上海嘉实（集团）有限公司 | Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method |
| CN104631251A (en) * | 2015-01-05 | 2015-05-20 | 王军 | Geogrid chamber lightweight mixed soil reinforced structure for bridge head treatment |
| CN109162161A (en) * | 2018-10-25 | 2019-01-08 | 江西博慧工程技术服务有限公司 | A kind of road structure and its construction method of Ground included structures |
| CN110273339A (en) * | 2019-07-18 | 2019-09-24 | 厦门东翔工程设计有限公司 | A kind of land subsidence crack resistence structure and its construction method |
| CN111119219A (en) * | 2020-01-06 | 2020-05-08 | 中国一冶集团有限公司 | Reinforced foundation tire membrane structure and construction method thereof |
-
2013
- 2013-06-07 CN CN201320329291XU patent/CN203334154U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334357A (en) * | 2013-06-07 | 2013-10-02 | 上海嘉实（集团）有限公司 | Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method |
| CN103334357B (en) * | 2013-06-07 | 2015-07-15 | 上海嘉实（集团）有限公司 | Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method |
| CN104631251A (en) * | 2015-01-05 | 2015-05-20 | 王军 | Geogrid chamber lightweight mixed soil reinforced structure for bridge head treatment |
| CN109162161A (en) * | 2018-10-25 | 2019-01-08 | 江西博慧工程技术服务有限公司 | A kind of road structure and its construction method of Ground included structures |
| CN109162161B (en) * | 2018-10-25 | 2020-07-14 | 江西博慧工程技术服务有限公司 | Road structure containing structural object road section and construction method thereof |
| CN110273339A (en) * | 2019-07-18 | 2019-09-24 | 厦门东翔工程设计有限公司 | A kind of land subsidence crack resistence structure and its construction method |
| CN111119219A (en) * | 2020-01-06 | 2020-05-08 | 中国一冶集团有限公司 | Reinforced foundation tire membrane structure and construction method thereof |
| CN111119219B (en) * | 2020-01-06 | 2021-08-13 | 中国一冶集团有限公司 | Reinforced foundation tire membrane structure and construction method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131211 |