CN104278608A - Novel highway embankment widened structure and construction method - Google Patents
Novel highway embankment widened structure and construction method Download PDFInfo
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- CN104278608A CN104278608A CN201310281073.8A CN201310281073A CN104278608A CN 104278608 A CN104278608 A CN 104278608A CN 201310281073 A CN201310281073 A CN 201310281073A CN 104278608 A CN104278608 A CN 104278608A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention relates to a novel highway embankment widened structure. The original roadbed slope of the structure is trimmed into a step shape, a high pressure jet grouting pile is disposed below an original roadbed slope cushion layer, pressurized continuous grouting is employed at an original roadbed cushion layer to form a slurry solid bearing plate, parts of pore cavities of the original roadbed are recharged with fine aggregate concrete or mortar; foundation treatment piles are employed to reinforce the foundation of a widened area, a drainage cushion layer is laid throughout the top of the foundation treatment piles; an earthwork cloth is laid on the drainage cushion layer, a cement soil plate is disposed on the earthwork cloth, high strength reinforcing mesh sheets are disposed in the cement soil plate; and the widened area embankment is formed by layered filling of excavation soil and light filler in a construction process. The structure provided by the invention can reinforce the bearing capacity of roadbed soil on both sides of the widened area and the original roadbed slope strength, and enhance the integrality of the embankment structure, reduce longitudinal cracks induced by differential settlement and the like at the juncture of new and old roadbeds, thus having good technical and economic benefits. The invention also discloses a construction method of the novel highway embankment widened structure.
Description
Technical field
The present invention relates to a kind ofly can improve widened region new-old concrete bond supporting capacity and globality simultaneously, novel road embankment widened structure that longitudinal crack that minimizing new and old roadbed junction is brought out due to relative settlement etc. produces and construction method.Belong to highway engineering field, be applicable to the one-sided or bilateral highway widening engineering in the reconstruction and extension project of old road, be specially adapted to soft clay area highway reconstruction and expansion engineering.
Background technology
In recent years, along with developing rapidly of China's economy, traffic volume of highway cumulative year after year, the traffic volume of some highways is close to saturation flow.To this, for meeting growing transport need and social development needs, highway reconstruction and expansion project gets more and more, though these projects have higher Technological Economy value to improving category of roads and improving road network structure, but because subgrade settlement distortion in old road is basicly stable, and the Settlement Consolidation time of new road roadbed is shorter, in addition the new road embankment later stage be usually greater than old road embankment from close settling amount, the qualitative problems of construction such as differential settlement is excessive, pavement cracking, local subsidence that cause new and old embankment easily to occur.Engineering practice shows, the technical barrier of widening of subgrade mainly reduces the relative settlement between new and old roadbed, and ensures effective linking of new and old roadbed, avoids the road way of escape face that is open to traffic to occur the diseases such as vertical, horizontal crack.
In engineering, for strengthening the combination of new-old pavement, controlling the differential settlement of new-old concrete bond, usually adopt new and old road embankment loading place step excavation at present, lay Application of geosynthetics-reinforced layer, adopt the project slash such as light material railway embankment using.Wherein, step excavation within the scope of new and old road embankment loading place step excavation Shi Jiu road embankment fill material, the construction of this method is simple, can strengthen the bonding strength at new and old road embankment loading place to a certain extent; Application of geosynthetics-reinforced bed course is set, reinforced soil embankment within the scope of new embankment fill material, lays the material such as geo-grid, reinforced mesh, with the globality of reinforcer and intensity; It is adopt light material as embankment fill material that light road bank fills, and this method can alleviate the weight of new railway embankment using to a great extent, reduces newly to fill out the subsidiary stress of embankment to old embankment basis.Facts have proved, above-mentioned measure all achieves good consolidation effect under suitable engineering specifications, but still deposit certain deficiency, as usual embankment step excavation in road can form potential water use, under the poor operating mode of roadbed substratum geological conditions, effectively can not reduce total settlement and the settlement amount after construction of new roadbed; The control effects of local reinforcement process to new and old embankment differential deformation is limited, usually can only delay the speed of crack progressing, and fundamentally can not block crack; Light road bank fills costly, and contact site exists obvious contact surface, is difficult to solve sedimentation problem of non-uniform that foundation of road bed uneven consolidation causes etc.
At present, have and do not affecting in the situation that is normally open to traffic, coordinated the method for lightweight displacement control settlement by embankment cross drilling, this method is injected light material reduce embankment structure weight by laterally being drawn in hole to embankment, and then realizes the object controlling posterior settlement.But method fails to realize the lateral stiffening reinforcement to embankment structure, and the deep layer transmission of upper load, limited to the control effects of relative settlement.
In sum, although have the measure that some can be used for solving Widened roads area differentiation settlement issues in engineering, the Combination application of various measure for controlling embankment later stage differential deformation, strengthen the globality at new and old road embankment loading position there is positive effect, but existing measure is mainly for new railway embankment using, rarely have the design relating to old road embankment supporting capacity and improve, difference settlement control large for embankment height requires that high section is difficult to be suitable for.
Given this, for effectively controlling new post-construction settlement of subgrade and total settlement, the differential settlement of the old and new's embankment after minimizing road widening, improve the globality of highway subgrade, urgently invention one effectively can improve new and old roadbed carrying environment at present, significantly improves the globality of embankment structure layer and the novel road embankment widened structure of cracking resistance.
Summary of the invention
The object of the invention is to invent a kind of novel road embankment widened structure that effectively can improve roadbed supporting capacity, control new and old embankment total settlement and differential settlement.
In order to realize above-mentioned technical purpose, present invention employs following technical scheme:
A kind of novel road embankment widened structure, it is characterized in that the former roadbed side slope of described structure is trimmed to step-like, former roadbed side slope bed course has high-pressure rotary jet grouting pile, adopt at former roadbed bed course place pressurization to continue slip casting and form the solid loaded plate of slurry, in former roadbed part vestibule, recharge pea gravel concreten or mortar; Basement process stake is adopted to reinforce widened region ground, basement process stake top wide bed drainage blanket; Drainage blanket top is equipped with geotextiles, geotextiles is put cement-soil plate, is provided with high tensile reinforcement mesh sheet in cement-soil plate; Widened region embankment is formed by the spoil in work progress and light filler placement in layers.
Former roadbed side slope is trimmed to and is provided with the step-like of leaning angle, and the vertical height of step and width control system, between 500 ~ 1000mm, step surface establish leaning angle; From each step surface or every level step, draw Kong Zhiyuan roadbed base surface downward vertically.
Drainage blanket paves at twice, and can adopt the uniform coarse sand of grating, rubble or slag of delaying clearly, upper surface is equipped with geotextiles.
Described basement process stake is weak Squeezing Soil Pile, can adopt cement mixing pile or bored pile, under stake top is positioned at drainage blanket bottom surface.
Cement-soil plate is by spoil and cement, lime or curing compound mix are even, layering paves, and compacting forms, built-in high tensile reinforcement mesh sheet.
Light filler is foam beads mix light-textured soil, air bubble mix light-textured soil or EPS particle light soil.
Be equipped with Earthworking reinforced bar material in different embankment fill material intersection, step extending level face, Earthworking reinforced bar material can adopt non-woven geotextile, Woven geofabric, Plastics Geogrids, steel plastic geogrid or earth grille.
Described novel road embankment widened structure, main construction course is as follows:
1) treatment construction is on-the-spot: peaceful pupil portion place, and lower shoveling layer to drainage blanket design bottom height, and lays the drainage blanket of 1/3 to 1/2 design thickness;
2) former roadbed side slope finishing: former roadbed side slope regulation, for step-like, arrange the leaning angle of 2 ~ 4%, vertically draws Kong Zhiyuan roadbed base surface downwards from step at different levels or every level step upper surface to step upper surface;
3) Construction of High Pressure Jet Grouting Pile: carry out Construction of High Pressure Jet Grouting Pile, Pile of High-pressure Spiral Jet end face absolute altitude flushes with former embankment base surface absolute altitude;
4) the solid bed course plate of slurry is shaped: after high-pressure rotary jet grouting pile reaches former embankment bed course position, reduces and revolves lance lift speed, or enters to suspend tube drawing and continue slip casting, whitewashing is fully combined with former roadbed course, forms slurry loaded plate admittedly;
5) vestibule backfill: after the solid bed course plate mud jacking of slurry completes, extract churning pipe, pour into pea gravel concreten or mortar in vestibule;
6) basement process pile driving construction: arrange stake position according to designing requirement in widened region, at stake position near zone excavation drainage blanket, carry out basement process pile driving construction, stake top mark is high to be flushed in drainage blanket bottom surface;
7) lay drainage blanket: after basement process stake reaches design strength, second time lays drainage blanket, and drainage blanket outer rim should be laid to edge, designing and arranging ditch, and drainage blanket evenly paves geotextiles;
8) fill cement-soil plate: fill cement-soil at geotextiles higher slice, and built-in high tensile reinforcement mesh sheet forms reinforced cement earth plate;
9) widening subgrade backfill: after cement-soil plate reaches design strength, filling roadbed, lays Earthworking reinforced bar material at different embankment fill material intersection, step excavation extending level face place, and its middle and upper part embankment adopts light filler to fill;
10) side slope waterproof, road structure construction: reach after design strength until light filler, light filler section does waterproofing work, and carries out top road structure construction.
the present invention has following feature and beneficial effect:
(1) carry out early stage to the soil body under old road base, roadbed bed course and roadbed by means such as rotary jet grouting and Materials with High Strength local displacements to reinforce, can play and coordinate old For Embankment Settlements, improve the object of new and old embankment contact area embankment supporting capacity, reduce because pupil portion subgrade construction and former side slope fill the impact that new roadbed filling produces it.
(2) adopt weak Squeezing Soil Pile and reinforced cement earth plate to reinforce new road roadbed, upper load evenly can be reached roadbed bottom bearing stratum, thus effectively control total settlement and the settlement amount after construction of new railway embankment using, and little on former road structure impact.
(3) cement-soil plate adopts scene to dig out the solidification of cubic metre of earth mix cement, lime and curing compound to form, arrange high tensile reinforcement mesh sheet, both can improve bending tensile strength and the cracking resistance of cement-soil plate, also can improve the utilization rate of embankment material in it; The drainage blanket arranged under cement-soil plate, the effect can played simultaneously block operation phase underground water rising passway, accelerate sleeping soft soil consolidation under the construction period, coordinate upper deformation.
(4) adopt light filler to backfill the upper embankment of new Widening Embankment, can make full use of that light material is lightweight, intensity is high, the advantage of good endurance, improve embankment fill material Physical and mechanical properties, the steady layer of water can not be done, save cost; Only adopt light filler at top roadbed, prevent roadbed from conducting oneself with dignity too small, cause roadbed to float.
In a word, feature of the present invention is the bearing capacity that both can improve new and old roadbed, the performance of deck near joint portion can be improved again, also can alleviate the weight of widened region embankment, achieve multi-angle and control new-old concrete bond differential deformation, prevent the object of road structure disease.
Accompanying drawing explanation
Fig. 1 is novel road embankment widened structure profile of the present invention.
In figure: 1-former roadbed, 2-former roadbed bed course, 3-former road surface structare layer, 4-pupil portion road surface structare layer, 5-recharge body, layer is filled in 6-light filler, 7-waterproofing course, 8-vegetation plantation layer, the solid loaded plate of 9-slurry, 10-high-pressure rotary jet grouting pile, 11-Earthworking reinforced bar material, 12-pupil portion is common backfilled roadbed supported, 13-cement-soil plate, 14-drainage blanket, 15-high tensile reinforcement mesh sheet, 16-geotextiles, 17-gutter, the stake of 18-basement process, 19-soft layer, 20-hardpan relatively.
Specific embodiment
Present embodiment Zhong Jiu road side slope of embankment bench excavation construction technical requirement, the design and construction technical requirements of basement process stake, high-pressure rotary jet grouting pile, lightweight balloon concrete, pea gravel concreten, the laying construction technical requirements of high tensile reinforcement mesh sheet, geotextiles, Earthworking reinforced bar material, be not repeated in the present embodiment such as the design and construction technical requirements of roadbed side slope protection, road structure, emphasis sets forth the embodiment that the present invention relates to structure.
Fig. 1 is novel road embankment widened structure profile of the present invention.With reference to shown in Fig. 1, novel road embankment widened structure by recharging body 5, layer 6 is filled in light filler, the solid bed course plate 9 of slurry, high-pressure rotary jet grouting pile 10, Earthworking reinforced bar material 11, pupil portion common backfilled roadbed supported 12, cement-soil plate 13, drainage blanket 14, geotextiles 16, basement process stake 18 etc. form.
Cleaning job site, digs to former roadbed bed course 2 times 600mm under pupil portion terrace, the thick drainage blanket 14 of 300mm is laid in leveling upper back, and course adopts coarse sand, and appropriate compacting, is convenient to machinery and marches into the arena.
Former roadbed 1 side slope filler is trimmed to step-like, and vertical height and the transverse width of step are 1000mm, step surface are established the leaning angle of 3%; With this step surface for end face, vertically draw below hole to rotary churning pile bottom design elevation 500mm downwards; The longitudinal separation of drawing hole is 3000mm, and lateral separation is that 1000mm(every grade step surface is arranged together).
Carry out high-pressure rotary jet grouting pile 10 based on hole construct vertically to draw, high-pressure rotary jet grouting pile 10 is formed by jet grouting pile driving machine churning in roadbed figure; The diameter of high-pressure rotary jet grouting pile 10 is 600mm, adopts double-pipe method high-pressure rotary-spray, jet grouting pile driving machine Stress control at about 25MPa, emitted dose 60L/min, rotary speed 8 ~ 10rpm, hoisting velocity 100mm/min, and once spray again.
When jet grouting pile driving machine churning is to the floor height of former roadbed bed course 2, the pressure of jet grouting pile driving machine is enlarged to 50MPa, and improves cement paste emitted dose, rotary speed, reduces and puies forward pipe speed; Repeatedly spray again in former roadbed bed course 2 scope, former roadbed course is fully mixed with cement paste, after each step churning condensation, form the solid bed course plate 9 of slurry.
Extract churning pipe immediately after churning terminates, and backfill pea gravel concreten in embankment boring vestibule, displace vestibule inward turning from bottom to top by Grouting Pipe and to spray and spoil over out discarded slurries, final formation recharges body 5, and the grade of compressive strength of pea gravel concreten is C25.
Locate basement process stake 18 positions laying on drainage blanket 14, removing top course, carries out basement process stake 18 and constructs.Basement process stake 18 adopts cement mixing pile, and the diameter of basement process stake 18 is 500mm, and the vertical horizontal spacing of stake is 3000mm, penetrates soft layer 19, stretches into 500mm in relative hardpan 20 bottom stake, and stake top is positioned at drainage blanket 14 times.Stake machine is twin shaft deep-mixing pile driver, adopts the construction of " four stir four sprays " method.Basement process stake 18 meets the requirement of existing relevant code, specification.
Cement mixing pile repairs hole, drainage blanket hole after reaching design strength, and continues raising 300mm drainage blanket 14, laterally paves to the side of draining 17 ditch, should carry out vibrations compacting in process of deployment.
Drainage blanket 14 laid rear to mat surface carry out leveling process, subsequently thereon lay geotextiles as geotextiles 16; Geotextiles adopts acupuncture nonwoven geotextiles, and specification is 300g/m
2, design parameter requires see table 1; Lap length between adjacent geotextiles 16 is not less than 200mm.
Table 1 geotextiles design parameter table
| Mass area ratio deviation | Thickness | Amplitude error | Ultimate strength | Elongation at break | CBR bursting strength | Effective aperture | Tearing brute force |
| 7% | ≥2.4 mm | -0.5% | ≥9.5 kN/m | 25~100% | ≥1.5 kN | 0.07~0.2 mm | ≥0.24 kN |
Cement-soil plate 13 is by digging out the earthwork and Portland cement mix forms, and adopt compaction in layers to fill out paving, degree of compaction is not less than 96%, and every layer of loose laying depth is about 150mm, and the gross thickness of compacted lift is 500mm; One end of cement-soil plate 13 is connected with the solid bed course plate of slurry, and the other end extends to side, gutter 17.
Arrange high tensile reinforcement mesh sheet 15 in cement-soil plate 13, this high tensile reinforcement mesh sheet 15 adopts steel strand to weave and forms, steel strand diameter 4mm, mesh size 100mm × 100mm.
Above-mentioned cement-soil plate 13, drainage blanket 14, high tensile reinforcement mesh sheet 15 and geotextiles 16 are all in the common backfilled roadbed supported 12 times elongated even layings of pupil portion.
Treat that cement-soil plate 13 solidifies, and after the corresponding construction in step place, common backfilled roadbed supported 12 fillers of back-filling in layers pupil portion, and compacting, select the roadbed filling taken conveniently, compacting is easy, intensity is high, water stability is good according to operating mode, compaction requirement meets the requirement of current specifications.
After filler is filled to lower embankment bottom surface elevation, adopt light material to fill formation light material and fill layer 6, light material is filled out and is adopted EPS particle light soil, its foam: soil=55:45, dry density is no more than 1.1 × 10
3kg/m
3, unconfined compression strength is not less than 280 kPa; The end face that light material fills layer 6 exceeds former road structure 3 bottom surface 300mm.
Different embankment fill material intersection, step excavation plane place all lay Earthworking reinforced bar material 10 and adopt earth grille, and geo-grid is laterally elongated laying in Widening Embankment filler, and should carry out stretch-draw; The properties of geo-grid is see table 2, and construction technical requirement should meet the requirement of current specifications.
Table 2 geo-grid design parameter table
Novel road embankment widened structure, main construction course is as follows:
1) prepare before construction: according to construction requirement, process construction plant, and carry out the construction line-putting; Cut out the soil layer of below former roadbed bed course 600mm, lay coarse sand 300mm, and carry out compacting, facilitate machine-walking;
2) treatment construction is on-the-spot: cleaning pupil portion ground, and by former roadbed side slope regulation for step-like, carry out compacting to step upper surface and arrange the leaning angle of 3%, vertically drawing hole downwards from step upper surface at different levels, drawing hole extends bottom former roadbed bed course 2;
3) Construction of High Pressure Jet Grouting Pile: carry out high-pressure rotary jet grouting pile 10 and construct, high-pressure rotary jet grouting pile 10 end face absolute altitudes flush with the bottom surface absolute altitude of former embankment bed course 2;
4) the solid bed course plate of slurry is shaped: after high-pressure rotary jet grouting pile 10 reaches former embankment bed course position, reduce and revolve lance lift speed, and carry out pressurization rotary jet grouting, churning pipe can move up and down within the scope of former roadbed bed course, whitewashing is fully combined with former roadbed course, forms the solid loaded plate 9 of slurry;
5) vestibule backfill: after solid bed course plate 9 mud jacking of slurry completes, extract churning pipe, pour into pea gravel concreten in vestibule, and displace original grout emitting, form pea gravel concreten and recharge body 5;
6) basement process pile driving construction: according to the drainage blanket 14 laid near designing requirement excavation stake position, carry out cement mixing pile 18 to widened region embankment to construct, stake top is to drainage blanket 14 times, and pile body flattens stake top after reaching design strength, repairs hole, 14 layers, draining pad hole;
7) secondary drainage setting cushion: evenly pave 300mm coarse sand on existing drainage blanket 14 again, paves to side, designing and arranging ditch 17, and compacting, top arranges geotextiles 16;
8) cement-soil plate is filled: fill cement-soil at geotextiles 16 higher slice, and built-in high tensile reinforcement mesh sheet 15, form reinforced cement earth plate;
9) widening subgrade backfill: according to the filling roadbed material of construction requirement, geo-grid is laid at different embankment fill material intersection, step excavation place, wherein goes up embankment and adopts light filler to fill, form light material and fill layer 6;
10) successive projects construction: after embankment completes, carries out roadbed side slope waterproofing course 7, road structure engineering 4, construction unit construction such as vegetation plantation layer 8 and gutter 17 etc.
Claims (8)
1. a novel road embankment widened structure, it is characterized in that the former roadbed side slope of described structure is trimmed to step-like, former roadbed side slope bed course has high-pressure rotary jet grouting pile, adopt at former roadbed bed course place pressurization to continue slip casting and form the solid loaded plate of slurry, in former roadbed part vestibule, recharge pea gravel concreten or mortar; Basement process stake is adopted to reinforce widened region ground, basement process stake top wide bed drainage blanket; Drainage blanket top is equipped with geotextiles, geotextiles is put cement-soil plate, is provided with high tensile reinforcement mesh sheet in cement-soil plate; Widened region embankment is formed by the spoil in work progress and light filler placement in layers.
2. novel road embankment widened structure according to claim 1, it is characterized in that former roadbed side slope is trimmed to and be provided with the step-like of leaning angle, the vertical height of step and width control system are between 500 ~ 1000mm; From each step surface or every level step, draw Kong Zhiyuan roadbed base surface downward vertically.
3. novel road embankment widened structure according to claim 1, is characterized in that described drainage blanket paves at twice, and can adopt the uniform coarse sand of grating, rubble or slag of delaying clearly, upper surface is equipped with geotextiles.
4. novel road embankment widened structure according to claim 1, is characterized in that described basement process stake is weak Squeezing Soil Pile, can adopt cement mixing pile or bored pile, under stake top is positioned at drainage blanket bottom surface.
5. novel road embankment widened structure according to claim 1, it is characterized in that described cement-soil plate by spoil and cement, lime or curing compound mix evenly, the layering compacting that paves forms, built-in high tensile reinforcement mesh sheet.
6. novel road embankment widened structure according to claim 1, is characterized in that described light filler is foam beads mix light-textured soil, air bubble mix light-textured soil or EPS particle light soil.
7. novel road embankment widened structure according to claim 1, it is characterized in that different embankment fill material intersection, step extending level face is equipped with Earthworking reinforced bar material, Earthworking reinforced bar material can adopt non-woven geotextile, Woven geofabric, Plastics Geogrids, steel plastic geogrid or earth grille.
8., according to the novel road embankment widened structure described in claim 1 ~ 7, main construction course is as follows:
1) treatment construction is on-the-spot: peaceful pupil portion place, and lower shoveling layer to drainage blanket design bottom height, and lays the drainage blanket of 1/3 to 1/2 design thickness;
2) former roadbed side slope finishing: former roadbed side slope regulation, for step-like, arrange the leaning angle of 2 ~ 4%, vertically draws Kong Zhiyuan roadbed base surface downwards from step at different levels or every level step upper surface to step upper surface;
3) Construction of High Pressure Jet Grouting Pile: carry out Construction of High Pressure Jet Grouting Pile, Pile of High-pressure Spiral Jet end face absolute altitude flushes with former embankment base surface absolute altitude;
4) the solid bed course plate of slurry is shaped: after high-pressure rotary jet grouting pile reaches former embankment bed course position, reduces and revolves lance lift speed, or enters to suspend tube drawing and continue slip casting, whitewashing is fully combined with former roadbed course, forms slurry loaded plate admittedly;
5) vestibule backfill: after the solid bed course plate mud jacking of slurry completes, extract churning pipe, pour into pea gravel concreten or mortar in vestibule;
6) basement process pile driving construction: arrange stake position according to designing requirement in widened region, at stake position near zone excavation drainage blanket, carry out basement process pile driving construction, stake top mark is high to be flushed in drainage blanket bottom surface;
7) lay drainage blanket: after basement process stake reaches design strength, second time lays drainage blanket, and drainage blanket outer rim should be laid to edge, designing and arranging ditch, and drainage blanket evenly paves geotextiles;
8) fill cement-soil plate: fill cement-soil at geotextiles higher slice, and built-in high tensile reinforcement mesh sheet forms reinforced cement earth plate;
9) widening subgrade backfill: after cement-soil plate reaches design strength, filling roadbed, lays Earthworking reinforced bar material at different embankment fill material intersection, step excavation extending level face place, and its middle and upper part embankment adopts light filler to fill;
10) side slope waterproof, road structure construction: reach after design strength until light filler, light filler section does waterproofing work, and carries out top road structure construction.
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| CN105648867A (en) * | 2016-03-02 | 2016-06-08 | 杭州江润科技有限公司 | Comprehensive ecological roadbed system and construction method |
| CN105926393A (en) * | 2016-04-27 | 2016-09-07 | 重庆燕皓建筑材料有限公司 | Method for filling embankments by using bubble mixed light soil |
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| CN113201986A (en) * | 2021-04-07 | 2021-08-03 | 安徽省交通规划设计研究总院股份有限公司 | Roadbed spliced wide portal type retaining wall structure and construction method |
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