CN103334357B - Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method - Google Patents
Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method Download PDFInfo
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- CN103334357B CN103334357B CN201310227609.8A CN201310227609A CN103334357B CN 103334357 B CN103334357 B CN 103334357B CN 201310227609 A CN201310227609 A CN 201310227609A CN 103334357 B CN103334357 B CN 103334357B
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Abstract
The invention relates to a viaduct road embankment structure with a lower pile foundation bearing platform extending in a roadbed, which mainly comprises roadbed treatment piles, pile top vertical and horizontal connection cover beams, light filler layers, stabilized soil backfill layers and horizontal reinforcement layers, wherein roadbed treatment piles are arranged in the roadbed, and connecting rebars are connected on the pile tops in advance; the vertical and horizontal connection cover beams are poured on the pile tops of the roadbed treatment piles and are connected with pile bodies through the pile top connecting rebars; the roadbed is backfilled by stabilized soil and the light filler layers in a layered mode, and is internally provided with the horizontal reinforcement layers. According to the viaduct road embankment structure, the integrality of a viaduct road embankment can be greatly improved, the property of roadbed filler can be improved, the weight of the filler is reduced, the problem of pavement longitudinal cracks and waves due to differential settlement caused by that a pile foundation bearing platform extends in the roadbed is solved, and the god technical and economic benefits are gained. The invention also provides a construction method of the road embankment structure.
Description
Technical field
The invention belongs to field of foundation treatment, under relating to a kind of viaduct, subgrade deformation combines control structure, particularly under a kind of viaduct, pile foundation support table stretches into embankment structure and the construction method thereof of roadbed, this structure has the supporting capacity improving subgrade soils, the globality strengthening roadbed filling, reduces the multiple advantages such as filler weight, to be applicable in soft clay area highway, town road subgrade project under viaduct, to be particularly useful for viaduct cushion cap and to stretch into the roadbed treatment that roadbed easily causes generation crack, road surface.
Background technology
Along with the expansion day by day of 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 designing pile foundation support table size and being larger, bridge pile foundation cushion cap often stretches in the roadbed under viaduct below road travel road, 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 feature in uneven thickness etc., and road structure easily occurs comparatively significantly settlement after construction under the action of traffic loading of top.
A large amount of engineering is actual to be shown, build viaduct, the bridge crossing engineering in soft clay area, due to bridge pile foundation sedimentation compared with little, subgrade settlement is large, if lack effective control measure and structure to subgrade deformation under viaduct, produce many adverse effects or potential safety hazard will to the constructing benefits of road and driving quality, as subgrade soils sedimentation can produce side direction frictional resistance to bridge pier, change the stress performance of pile body; The differential settlement distortion of roadbed can cause cushion cap adjacent edges to occur the engineering disease such as longitudinal crack or pavement track, shortens the curing period of road; Road structure distortion can affect the performance of road structure, and then the comfortableness of impact driving, reduction road passage capability, even causes traffic safety hidden danger.
The measure that the problems referred to above are tackled in current each department mainly contains and adds laid process, the displacement of excavation light material, slip casting method etc.Add laid process and namely more than former road crust, overlay ground surface material, though this method can make up rapidly the differential settlement between section, the quick current condition improving highway, but because it fails to improve the load-carrying properties of infrastructure, add the weight that overlay can increase the weight of road structure, it is unfavorable to control for settlement of soft foundation, easily occur that all the more paving gets over the vicious circle of sedimentation, and the engineering cost repeatedly overlayed is also higher.Slip casting method is pressed into a certain amount of cement paste by Grouting Pipe to reinforcing area, the supporting capacity of roadbed is improved by solidification subgrade soil, but this reinforcement measure is to reinforce for the purpose of shallow layer soft ground or top roadbed, slip casting is difficult to relative hardpan when darker to weak soil, the section also more difficult injection embankment center wider to roadbed, simultaneously grouting and reinforcing ground is as grouting pressure or process control is improper also easily causes slip casting uneven, causes road structure to occur inhomogeneous deformation under overlying burden effect.Light material changes and fills out is adopt light material to replace original filling for embankment, this method to reduce roadbed overlying burden, reduce road surface bulk settling there is good pretreating effect, but it is higher to play engineering cost when extensive employing, and due to the bearing capacity of filler itself not high, anti-shearing force is poor, tackling the road structure that caused by viaduct pile foundation and roadbed subsidence difference, to be out of shape fashion inadequate, especially under Soft Soil.Light material is adopted to replace roadbed filling, though the weight of embankment can be reduced, but this method is difficult to the globality improving the zones of different soil body within the scope of roadbed, the inhomogeneous deformation amount of still difficult cooperation control roadbed, and draws the improvement effect of performance comparatively limited to soil body bending resistance.Therefore, as adopted light filler railway embankment using, performance is drawn in anti-shearing, the bending resistance that need improve embankment.
In sum, current engineering circles is punished main based on post for the road disease under viaduct and subgrade deformation problem, as added laid process, the displacement of excavation light material and slip casting method etc., these methods also achieve ideal punishment effect under certain engineering specifications.But in general, because these methods do not relate to the structure optimization combination of embankment, it improves limited efficiency, be difficult to fundamentally to solve the compatibility of deformation problem of embankment fill material under bridge pier, even there will be the vicious circle that more remedies problems is more serious.
In view of above-mentioned technical background, the road disease problem that roadbed may cause is stretched in order to better prevent and treat pile foundation support table under viaduct, improve the constructing benefits of road, need a kind of reasonably road under bridge embankment structure of invention at present badly, make it both effectively can 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 object of the invention is to by reinforcing road bed, reduce overlying burden and strengthen road structure cooperative bearing performance three kinds of settlement Control measures to combine, subgrade defect control structure and construction method under the novel viaduct invent and a kind ofly effectively can prevent and treat road differential settlement under viaduct, improving roadbed filling performance.
In order to realize above-mentioned technical purpose, present invention employs following technical scheme:
Under viaduct, pile foundation support table stretches into an embankment structure for roadbed, it is characterized in that described structure primarily of roadbed treatment stake, stake top in length and breadth to connection bent cap, light filler layer, solidified earth backfill layer, transversal reinforcement layer composition; In roadbed, arrange roadbed treatment stake, connecting reinforcement is preset on stake top; Build in roadbed treatment stake stake top to connection 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 transversal reinforcement layer.
Roadbed treatment stake is weak soil compaction, non-Squeezing Soil Pile, pile body distance viaduct cushion cap edge 500mm ~ 800mm, penetrate flabbily basic unit, squeeze into bearing stratum 500mm ~ 2000mm, pile spacing is 3000mm ~ 4000mm, in length and breadth to arranging at equal intervals, stake is long optionally to be reduced according to sedimentation smoothly transition principle or remains unchanged.
Stake top is steel concrete integral cast-in-situ bent cap to connection bent cap in length and breadth, and in groined type, stake roof rail in edge extends 600 ~ 1000mm short distance cantilever, and bent cap width is 1 ~ 2 times of basement process stake stake footpath; In bent cap, reinforcing bar is connected with roadbed treatment stake top rebars, and connected mode is welding or colligation connection.
Described solidified earth backfill layer is formed with curing compound mix by former roadway excavation soil, and be cured to stake top in length and breadth to connecting square 600mm ~ 1200mm under bent cap beam, 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.
Transversal reinforcement layer is high tensile reinforcement mesh sheet or steel plastic geogrid, requires to arrange one or more layers according to filler compatibility of deformation.
Under described viaduct, pile foundation support table stretches into the construction method of the embankment structure of roadbed, it is characterized in that comprising the following steps:
1) prepare before construction: according to design drawing, process construction plant, measures stake position, draws stake position outline line;
2) soil taking hole forming: boring extracting soil, should be aided with mud off if desired or bury casing underground;
3) roadbed treatment pile driving construction: behind clear hole, basement process stake of constructing in pore-forming, controls pile body embedded depth according to designing requirement, and preset on stake top with in length and breadth to the reinforcing bar being connected bent cap and connecting;
4) dig backfill solidified earth under: after roadbed treatment stake intensity reaches designing requirement, dig Roadbed Soil to stake under the mode adopting hand excavation and mechanical equivalent of light excavation to combine and push up following design elevation, layering after the soil body dug out solidification is all spread and is backfilled to stake top;
5) stake top in length and breadth to connection Coping Construction: have after some strength until backfill, establish template in the stake topmast of roadbed treatment stake, connect stake top preset reinforcing bar with in length and breadth to the reinforcing bar being connected bent cap, build stake top in length and breadth to connect bent cap;
6) fill solidified earth: after stake top reaches design strength to connection bent cap in length and breadth, stripping, continue placement in layers solidification back fill course;
7) transversal reinforcement layer is laid: after solidified earth has been laid, and lays transversal reinforcement layer, and carries out stretch-draw;
8) pave light soil: after compacting solidification backfill, pave light filler layer;
9) road surface structare layer construction: carry out road structure construction according to designing requirement.
the present invention has following characteristics and beneficial effect:
(1) adopt weak soil compaction, non-Squeezing Soil Pile carries out roadbed treatment, the impact of pile body construction on contiguous viaduct pile foundation support table can be reduced; Roadbed treatment stake stake is long optionally to be reduced according to sedimentation smoothly transition principle or remains unchanged, and better can coordinate the distortion of subgrade soils.
(2) adopt integral cast-in-situ to connection bent cap in length and breadth, and be connected in one overall with weak Squeezing Soil Pile by the reserved steel bar at top, both effectively can 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 the intensity of embankment fill material can be improved, can also reduce embankment earthwork carrying engineering quantity, the feature utilizing air bubble mix light-textured soil to have higher-strength, water resistance and durability also can save the construction of the steady layer of water in subgrade construction.
(4) transversal reinforcement layer is set between air bubble mix light-textured soil and solidified earth and in solidification soil layer, promotes roadbed shear resistance, the effect of reinforcer globality, the distribution of adjustment upper load, the distortion of coordination embankment can be played simultaneously.
In a word, feature of the present invention is, by weak Squeezing Soil Pile, load is reached roadbed bearing stratum, by arranging in length and breadth to the globality and the anti-settling ability that connect bent cap enhancing embankment structure, the performance of filler is improved by backfill solidified earth, light soil, by arranging the compatible deformation ability of transversal reinforcement layer reinforcer, there is good technical economic benefit.
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: the stake of 1-roadbed treatment, 2-reinforcing cage, 3-Soft Soil Layer, 4-bearing stratum, 5-road surface structare layer, 6-lightweight soil layer, 7-transversal reinforcement layer, 8-solidification back fill course, 9-stake top are in length and breadth to connection bent cap, 10-road kerb, 11-greenbelt, 12-isolated column, 13-bridge pier, 14-pile foundation support table, 15-viaduct pile foundation.
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., be not repeated in present embodiment, emphasis sets forth the embodiment that the present invention 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.With reference to shown in Fig. 1 ~ 4, the embankment structure that under viaduct, pile foundation support table stretches into roadbed primarily of roadbed treatment stake 1, lightweight soil layer 6, transversal reinforcement layer 7, solidified earth back fill course 8, stake top in length and breadth to part compositions such as connection bent caps 9.
Basement process stake 1 adopts bored pile, stake footpath 400mm, pile body and viaduct pile foundation support table 14 are apart from being 500mm, roadbed treatment stake 1 degree of depth of squeezing into bearing stratum with pile body and bridge pile foundation cushion cap 14 distance increase and reduce gradually, the degree of depth wherein squeezing into bearing stratum 4 at the bottom of long stake stake is 1000mm, and the degree of depth that stub squeezes into bearing stratum is 500mm; Concrete strength of pile grade is C30, and the longitudinal reinforcement of reinforcing cage 2 adopts HRB335(diameter to be 16mm) indented bars, spiral bar adopts HPB300(diameter to be 8mm) plain steel-bar.The length that the longitudinal reinforcement of reinforcing cage 2 stretches out stake top is 200mm, be used as with in length and breadth to the dowel being connected bent cap 9; The Specific construction of roadbed treatment stake 1 requires the regulation meeting current specifications, and construction apparatus clear height requires lower than viaduct height, avoids the impact on pile foundation support table 14 and viaduct pile foundation 15 during construction basement process stake as much as possible.
Stake top in length and breadth to connection bent cap 9 be steel concrete integral cast-in-situ bent cap, strength grade of concrete is C30, and the width of bent cap in roadbed filling region is 500mm, be highly 400mm, vertical lateral connection, overlooks in groined type, and stake top, edge extends 600mm short distance cantilever; Adopt HRB335(diameter to be 16mm to the longitudinal reinforcement connecting bent cap 9 in length and breadth) indented bars, stirrup adopts HPB300(diameter to be 8mm) plain steel-bar; Be connected to the connection longitudinal reinforcement of bent cap 9 with the longitudinal reinforcement colligation of reinforcing cage 2 in length and breadth.
Solidification back fill course 8 by the boring soil body that takes out, under dig the part soil body and levelling of the land time waste soil and curing compound mix together, Portland cement selected by curing compound, and cement strength grade is 32.5MPa, and curing agent ratio example is 8%(mass ratio).Solidified earth backfill layer thickness is 2000mm, comprise stake top in length and breadth to connection bent cap under 1000mm with lightweight soil layer 6 end to stake top in length and breadth to the 600mm being connected bent cap 9 end face, and stake top also backfills to connection bent cap 9 spaces in length and breadth, spread one deck transversal reinforcement layer 7 to connection bent cap 9 end face place in length and breadth on stake top, the convex layer 8 of solidification backfill extends to bridge pier 13 surrounding.
Transversal reinforcement layer 7 selects steel plastic geogrid, the every linear meter(lin.m.) tensile yield power >=80kN/m of steel plastic geogrid, elongation at yield rate≤3%.By laydown machine or manual method, grid is slowly drawn paving forward, often spread the straightening of 10 meters of progress pedestrian works once, laterally carry out interting with 8# iron wire every 1000mm to geo-grid overlap along roadbed and connect, and on the grid of laying every 1500mm with U-shaped nail anchoring once.
Lightweight soil layer 6 adopts air bubble mix light-textured soil, is located under being positioned at road surface structare layer, thickness 500mm, and under viaduct, in scope, embankment equal thickness is laid.The match ratio of air bubble mix light-textured soil should require to select according to design strength, wet density, mobility etc., air bubble mix light-textured soil design wet density is for being not more than 6.5kN/m3, within 28 days, unconfined compression strength is all not less than 0.8MPa, cement adopts 32.5# Portland cement, and bubble ratio is not less than 65%; One deck transversal reinforcement layer 7 is spread at lightweight soil layer 6 and solidification back fill course 8 contact surface place.
Adopt bored pile be under the viaduct of roadbed treatment stake pile foundation support table to stretch into the main construction sequence of the embankment structure of roadbed as follows:
1) prepare before construction.According to design drawing, process construction plant, measures stake position, draws stake position outline line.
2) soil taking hole forming.Boring extracting soil, should be aided with mud off if desired or bury casing underground, and stake is long to be determined according to designing requirement.
3) roadbed treatment 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, forms roadbed treatment stake 1.
4) backfill solidified earth is dug under.After the intensity of roadbed treatment stake 1 reaches designing requirement, below Roadbed Soil 3 to roadbed treatment stake 1 end face 1000mm is dug under the mode adopting hand excavation and mechanical equivalent of light excavation to combine, layering after the soil body dug out solidification is all spread and is backfilled to stake top, form the solidification back fill course 8 of bottom.
5) stake top is in length and breadth to connection Coping Construction.After the solidification back fill course 8 of roadbed treatment stake 1 bottom reaches design strength, establish template in the stake topmast of roadbed treatment stake, template width 500mm, and the default reinforcing bar connecting roadbed treatment stake 1 top with in length and breadth to the reinforcing bar being connected bent cap 9, concreting, forms stake top in length and breadth to connection bent cap 9.
6) solidified earth is filled.After until stake top, to connection, bent cap 9 reaches design strength in length and breadth, form removal, lays first floor transversal reinforcement layer 7, and carries out stretch-draw, fixing, then placement in layers solidification back fill course 8.
7) transversal reinforcement layer is laid.Solidification after back fill course 8 filled, lays second layer transversal reinforcement layer 7, and carries out stretch-draw, fixing.
8) pave light soil.Pave the air bubble mix light-textured soil layer 6 of suitable thickness.
9) road surface structare layer construction.The construction of road structure 5 and road kerb 10, greenbelt 11, isolated column 12 etc. is carried out according to designing requirement.
Claims (1)
1. under viaduct, pile foundation support table stretches into the construction method of the embankment structure of roadbed, and described structure forms to connection bent cap, light filler layer, solidified earth backfill layer and transversal reinforcement layer in length and breadth primarily of roadbed treatment stake, stake top; In roadbed, arrange roadbed treatment stake, connecting reinforcement is preset on stake top; Build in roadbed treatment stake stake top to connection 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 transversal reinforcement layer; It is characterized in that described construction method comprises the following steps:
1) prepare before construction: according to design drawing, process construction plant, measures stake position, draws stake position outline line;
2) soil taking hole forming: boring extracting soil, is aided with mud off or buries casing underground;
3) roadbed treatment pile driving construction: behind clear hole, basement process stake of constructing in pore-forming, controls pile body embedded depth according to designing requirement, and preset on stake top with in length and breadth to the reinforcing bar being connected bent cap and connecting;
4) dig backfill solidified earth under: after roadbed treatment stake intensity reaches designing requirement, dig Roadbed Soil to stake under the mode adopting hand excavation and mechanical equivalent of light excavation to combine and push up following design elevation, layering after the soil body dug out solidification is all spread and is backfilled to stake top;
5) stake top in length and breadth to connection Coping Construction: have after some strength until backfill, establish template in the stake topmast of roadbed treatment stake, connect stake top preset reinforcing bar with in length and breadth to the reinforcing bar being connected bent cap, build stake top in length and breadth to connect bent cap;
6) fill solidified earth: after stake top reaches design strength to connection bent cap in length and breadth, stripping, continue placement in layers solidification back fill course;
7) transversal reinforcement layer is laid: after solidified earth has been laid, and lays transversal reinforcement layer, and carries out stretch-draw;
8) pave light soil: after compacting solidification backfill, pave light filler layer;
9) road surface structare layer construction: carry out road structure construction according to designing requirement.
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| CN201310227609.8A CN103334357B (en) | 2013-06-07 | 2013-06-07 | Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method |
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| CN201310227609.8A CN103334357B (en) | 2013-06-07 | 2013-06-07 | Viaduct road embankment structure with lower pile foundation bearing platform extending in roadbed, and construction method |
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| CN103526770B (en) * | 2013-10-16 | 2015-09-09 | 鸿鑫建设集团有限公司 | A kind of construction method of high antiseepage anti-floating pile raft structure |
| CN107841908A (en) * | 2017-11-30 | 2018-03-27 | 中铁第四勘察设计院集团有限公司 | For eliminating the road structure of the high embankment lateral variation sedimentation in high-speed railway abrupt slope |
| CN107956194A (en) * | 2017-12-25 | 2018-04-24 | 武汉广益交通科技股份有限公司 | Ensure the soft soil roadbed structure and construction method of roadbed reclamation |
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| JP6572469B1 (en) | 2019-04-02 | 2019-09-11 | 株式会社プレックス | Concrete foundation structure and its construction method |
| CN110273339B (en) * | 2019-07-18 | 2021-03-05 | 厦门东翔工程设计有限公司 | Ground sinking anti-cracking structure and construction method thereof |
| CN110983891B (en) * | 2019-12-25 | 2021-10-26 | 长沙理工大学 | Highway reconstruction and expansion assembly type roadbed structure and construction method thereof |
| CN111118967A (en) * | 2019-12-30 | 2020-05-08 | 中铁第六勘察设计院集团有限公司 | Construction method for filling foam light soil foundation pit of railway roadbed in soft soil area |
| CN112942003B (en) * | 2021-02-04 | 2022-05-13 | 河海大学 | Vertical pouring type solidified soil embankment construction mold and method |
| CN113293706B (en) * | 2021-05-25 | 2022-05-20 | 中建三局集团有限公司 | Synchronous design and construction method for bridge pile foundation and peripheral underground structure |
| CN114541182B (en) * | 2022-01-17 | 2023-06-20 | 中铁工程设计咨询集团有限公司 | Double-channel stress compensation type high-speed railway platform widening structure and construction method thereof |
| CN114508090B (en) * | 2022-01-29 | 2023-05-16 | 中铁二院昆明勘察设计研究院有限责任公司 | Comprehensive treatment method for road miscellaneous fill at bottom layer of viaduct |
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