CN104278608B - The constructional method of a kind of highway embankment widened structure - Google Patents
The constructional method of a kind of highway embankment widened structure Download PDFInfo
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- CN104278608B CN104278608B CN201310281073.8A CN201310281073A CN104278608B CN 104278608 B CN104278608 B CN 104278608B CN 201310281073 A CN201310281073 A CN 201310281073A CN 104278608 B CN104278608 B CN 104278608B
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- 238000010276 construction Methods 0.000 claims abstract description 41
- 239000000945 fillers Substances 0.000 claims abstract description 31
- 238000000034 methods Methods 0.000 claims abstract description 30
- 239000004746 geotextiles Substances 0.000 claims abstract description 26
- 239000002689 soil Substances 0.000 claims abstract description 18
- 239000002002 slurries Substances 0.000 claims abstract description 17
- 239000007787 solids Substances 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 235000010582 Pisum sativum Nutrition 0.000 claims abstract description 10
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 5
- 238000007569 slipcasting Methods 0.000 claims abstract description 5
- 239000010410 layers Substances 0.000 claims description 26
- 239000000463 materials Substances 0.000 claims description 23
- 230000002787 reinforcement Effects 0.000 claims description 14
- 280000312338 Pavement companies 0.000 claims description 10
- 210000001747 Pupil Anatomy 0.000 claims description 10
- 239000004568 cements Substances 0.000 claims description 10
- 241000219843 Pisum Species 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 9
- 239000007921 sprays Substances 0.000 claims description 9
- 239000000203 mixtures Substances 0.000 claims description 7
- 239000011901 water Substances 0.000 claims description 7
- 238000005056 compaction Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000011499 joint compounds Substances 0.000 claims description 4
- 239000004033 plastics Substances 0.000 claims description 4
- 241001088417 Ammodytes americanus Species 0.000 claims description 3
- -1 Woven geofabric Substances 0.000 claims description 3
- 239000004794 expanded polystyrene Substances 0.000 claims description 3
- 239000006260 foams Substances 0.000 claims description 3
- 239000002245 particles Substances 0.000 claims description 3
- 239000003570 air Substances 0.000 claims description 2
- 239000011324 beads Substances 0.000 claims description 2
- 230000002940 repellent Effects 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000003079 width control Methods 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 abstract description 6
- 240000004713 Pisum sativum Species 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000001276 controlling effects Effects 0.000 description 3
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- 230000003014 reinforcing Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000015450 Tilia cordata Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000003776 cleavage reactions Methods 0.000 description 2
- 201000010099 diseases Diseases 0.000 description 2
- 238000006073 displacement reactions Methods 0.000 description 2
- 238000005755 formation reactions Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 210000000481 Breast Anatomy 0.000 description 1
- 210000003205 Muscles Anatomy 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 208000008425 Protein Deficiency Diseases 0.000 description 1
- 238000001467 acupuncture Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 235000019878 cocoa butter replacer Nutrition 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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- 238000005336 cracking Methods 0.000 description 1
- 230000001186 cumulative Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005516 engineering processes Methods 0.000 description 1
- 230000002045 lasting Effects 0.000 description 1
- 230000002250 progressing Effects 0.000 description 1
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- 238000007711 solidification Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- Y02A30/68—
Abstract
Description
Technical field
The present invention relates to a kind of can improve widened region new-old concrete bond supporting capacity and globality simultaneously, novel road embankment widened structure that longitudinal slit that minimizing new and old roadbed junction is brought out due to difference sedimentation etc. produces and constructional method. Belonging to highway engineering field, the single side being applicable in the reconstruction and extension project of old road or two sides highway widening engineering, 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 volume of traffic of some highways is close to saturation traffic amount. 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 improve road network structure, but owing to subgrade settlement distortion in old road is substantially 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 sinkability, the qualitative problems of construction such as differential settlement is excessive, pavement cracking, local depression that cause new and old embankment easily to occur. Engineering practice shows, the technical barrier of widening of subgrade mainly reduces the difference sedimentation 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 the diseases such as vertical, horizontal crack occur.
In engineering, for strengthening the combination of new-old pavement, the non-uniform settling of control new-old concrete bond, usually adopt new and old road embankment loading place step excavation at present, lay geosynthetics reinforcing layer, adopt the project slash such as light material railway embankment.Wherein, step excavation within the scope of new and old road embankment loading place step excavation Shi Jiu road embankment filler, the construction of this method is simple, can strengthen the strength of joint at new and old road embankment loading place to a certain extent; Geosynthetics reinforcement cushion is set, reinforced soil embankment be lay the material such as geo-grid, reinforced mesh within the scope of new embankment filler, with the globality of reinforcing filler and intensity; It is adopt light material as embankment filler that light road bank fills, and this method can alleviate the weight of new railway embankment to a great extent, reduces and newly fills out embankment to the additional stress on 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 roadbed poor operating mode of underlying stratum geologic condition, can not effectively reduce total settlement and the settlement amount after construction of new roadbed; Local adds muscle process, and the control effects of new and old embankment differential deformation is limited, usually can only delay the speed of crack progressing, and can not fundamentally block crack; Light road bank fills costly, and contact position exists obvious contact surface, it is difficult to sedimentation problem of non-uniform that the solution uneven consolidation of foundation of road bed causes etc.
At present, having and do not affecting in the situation that is normally open to traffic, laterally being holed by embankment coordinates the method for lightweight displacement control settlement, and this method is injected light material by laterally drawing to embankment and reduced embankment structure weight in hole, 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, and the control effects of difference sedimentation is limited.
In sum, although more existing measures that can be used for solving Widened roads area differentiation settlement issues in engineering, the Combination application of various measure has positive effect for the globality controlling embankment later stage differential deformation, strengthening new and old road embankment loading position, but existing measure is mainly for new railway embankment, rarely having the design relating to old road embankment supporting capacity and improving, difference settlement control big for embankment filled height requires that high section is difficult to be suitable for.
Given this, for effectively controlling new post-construction settlement of subgrade and total sedimentation, the differential settlement of the old and new's embankment after minimizing road widening, improve the globality of highway subgrade, urgently invention one can effectively 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 resistance to cleavage.
Summary of the invention
It is an object of the invention to invention a kind of can effectively improve roadbed supporting capacity, control the novel road embankment widened structure of 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 bed course has high-pressure rotary jet grouting pile, adopts at former roadbed bed course place pressurization to continue slip casting and forms the solid loading plate of slurry, has recharged pea gravel concreten or mortar in former roadbed part vestibule; Basement process stake is adopted to reinforce widened region ground, basement process stake top wide bed drainage blanket; Drainage blanket top is equipped with geotextile, and geotextile is put cement-earth plate, is provided with High Strength Steel Bar mesh sheet in cement-earth plate; Widened region embankment is filled by the spoil in construction process and light filler layering and is formed.
Former roadbed side slope is trimmed to and is provided with the step-like of interior inclination angle, and the vertical height of step and width control system, between 500 ~ 1000mm, step surface are established interior inclination angle;From each step surface or every level step, draw Kong Zhiyuan roadbed base surface downward vertically.
Drainage blanket divides and paves for twice, and level can be adopted to join uniform coarse sand, rubble or slag of delaying clearly, and upper surface is equipped with geotextile.
Described basement process stake is weak soil compaction stake, can adopt cement mixing pile or cast-in place pile, under stake top is positioned at drainage blanket bottom surface.
Cement-earth plate mix by spoil and cement, lime or solidifying agent close evenly, layering paves compacting and becomes, built-in High Strength Steel Bar mesh sheet.
Light filler is foam beads mix light-textured soil, air bubble mix light-textured soil or EPS particle light soils.
At different embankment filler boundary place, step extending level face be equipped with geotechnique's reinforcement material, geotechnique's reinforcement material can adopt non-woven geotextile, Woven geofabric, plastic civil engineering grid, 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 is 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: step upper surface, for step-like, arranged the interior inclination angle of 2 ~ 4%, vertically draws Kong Zhiyuan roadbed base surface downwards from step at different levels or every level step upper surface by the regulation of former roadbed side slope;
3) high-pressure rotary-spray pile driving construction: carry out high-pressure rotary-spray pile driving construction, high-pressure rotary jet grouting pile stake end face absolute altitude and former roadbed base surface absolute altitude are put down together;
4) the solid loading plate of slurry is shaped: after high-pressure rotary jet grouting pile reaches former roadbed bed course position, reduces and revolves lance lift speed, or enters to suspend the lasting slip casting of tube drawing, and whitewashing is fully combined with former roadbed course, forms the solid loading plate of slurry;
5) vestibule backfill: the solid loading plate mud jacking of slurry is extracted churning pipe, poured into pea gravel concreten or mortar in vestibule after completing;
6) basement process pile driving construction: arrange stake position according to design requirements in widened region, excavates drainage blanket at stake position near zone, carries out basement process pile driving construction, and stake top mark Gao Qiping is in drainage blanket bottom surface;
7) laying 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 geotextile;
8) cement-earth plate is filled: cement-earth is filled in layering in geotextile, and built-in high strength reinforcement mesh sheet forms reinforced cement earth plate;
9) widen roadbase backfill: after cement-earth plate reaches design strength, filling roadbed, at different embankment filler boundary place, step excavation extending level face place lay geotechnique's reinforcement material, wherein top embankment adopts light filler to fill;
10) side slope waterproof, pavement structure are constructed: reaching after design strength until light filler, light filler section does WATER REPELLENT, and carries out top pavement structure construction.
The present invention has following feature and useful effect:
(1) undertaken reinforcing early stage by means such as rotary jet grouting and Materials with High Strength local displacements to the soil body under old road base, roadbed bed course and roadbed, can play and coordinate the distortion of old Embankment Subsidence, improve the object of new and old embankment contact region embankment supporting capacity, reduce the impact filled new roadbed filling and it produced because of pupil portion subgrade construction and former side slope.
(2) adopt weak soil compaction stake 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, and the impact of former road structure is little.
(3) cement-earth plate adopts scene to dig out a cubic metre of earth mixing water mud, lime and solidifying agent solidification and become, and arranges High Strength Steel Bar mesh sheet, both can improve bending tensile strength and the resistance to cleavage of cement-earth plate, also can improve the utilization ratio of embankment filling material in it;The drainage blanket arranged under cement-earth plate, the effect can played simultaneously block operation phase underground water rising passway, accelerate sleeping soft soil consolidation under the construction time, coordinate upper deformation.
(4) adopt light filler backfill newly to widen the upper embankment of embankment, can make full use of that light material weight is light, the advantage of intensity height, good endurance, improve embankment filler 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 little, cause roadbed to float.
In a word, the feature of the present invention is both can improve the bearing capacity of new and old roadbed, the performance of structural sheet near joint portion can be improved again, also can alleviate the weight of widened region embankment, it is achieved that multi-angle controls new-old concrete bond differential deformation, prevents the object of pavement structure disease.
Accompanying drawing explanation
Fig. 1 is novel road embankment widened structure sectional drawing of the present invention.
In figure: 1 former roadbed, 2 former roadbed bed courses, 3 former road surface structare layers, 4 pupil portion road surface structare layers, 5 recharge body, layer is filled in 6 light fillers, 7 waterproof layers, 8 vegetation plantation layers, the 9 solid loading plates of slurry, 10 high-pressure rotary jet grouting piles, 11 geotechnique's reinforcement materials, 12 pupil portion common backfilled roadbed supported, 13 cement-earth plates, 14 drainage blankets, 15 High Strength Steel Bar mesh sheet, 16 geotextile, 17 waterwayss, 18 basement process stakes, 19 soft layers, 20 relative pan soil layers.
Specific embodiment
Present embodiment Zhong Jiu road embankment side slope 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 Strength Steel Bar mesh sheet, geotextile, geotechnique's reinforcement material, being not repeated in the present embodiment such as the design and construction technical requirements of roadbed side slope protection, pavement structure, emphasis sets forth the enforcement mode that the present invention relates to structure.
Fig. 1 is novel road embankment widened structure sectional drawing 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 loading plate 9 of slurry, high-pressure rotary jet grouting pile 10, geotechnique's reinforcement material 11, pupil portion common backfilled roadbed supported 12, cement-earth plate 13, drainage blanket 14, geotextile 16, basement process stake 18 etc. form.
Cleaning working-yard, digs under pupil portion terrace to former roadbed bed course 2 times 600mm, and 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 the vertical height of step and horizontal width are 1000mm, and step surface is established the interior inclination angle of 3%; Taking this step surface as end face, vertically draw below hole to rotary churning pile bottom design elevation 500mm downwards; The longitudinal interval drawing hole is 3000mm, is laterally spaced apart 1000mm(every grade step surface and arranges together).
Carry out high-pressure rotary jet grouting pile 10 to erect based on hole construct to drawing, high-pressure rotary jet grouting pile 10 by jet grouting pile driving machine in roadbed figure churning and become; 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 pressure-controlling at about 25MPa, emitted dose 60L/min, speed of rotation 8 ~ 10rpm, pulling speed 100mm/min, and once spray again.
When jet grouting pile driving machine churning is to the bottom surface height of former roadbed bed course 2, the pressure of jet grouting pile driving machine is enlarged to 50MPa, and improves grout emitted dose, speed of rotation, reduces and puies forward pipe speed;Repeatedly spraying again in former roadbed bed course 2 scope, former roadbed course is fully mixed with grout, each step churning forms the solid loading plate 9 of slurry after condensing.
Churning pipe is extracted in churning immediately after terminating, and holes in vestibule to embankment and backfill pea gravel concreten, displaces vestibule inward turning from bottom to top by Grouting Pipe and sprays and spoils over out discarded slurries, and final formation recharges body 5, and the grade of compressive strength of pea gravel concreten is C25.
Drainage blanket 14 is located basement process stake 18 positions laying, remove top course, carry out basement process stake 18 and construct. Basement process stake 18 adopts cement mixing pile, and the diameter of basement process stake 18 is 500mm, and the vertical transverse pitch of stake is 3000mm, penetrates soft layer 19, stretches into 500mm in relative pan soil layer 20 bottom stake, and stake top is positioned at drainage blanket 14 times. Stake machine is twin shaft deep-mixed pile machine, 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.
Mat surface is carried out leveling process after having laid by drainage blanket 14, lays geotextile subsequently thereon as geotextile 16; Geotextile adopts acupuncture nonwoven geotextile, and specification is 300g/m2, concrete parameter request is see table 1; Lap length between adjacent geotextile 16 is not less than 200mm.
The concrete parameter list of table 1 geotextile
Cement-earth plate 13 is mixed with ordinary Portland cement to close by being dug out the earthwork, adopts compaction in layers to fill out paving, and compactness is not less than 96%, and every layer of loose laying depth is about 150mm, and the total thickness of compacting layer is 500mm; One end of cement-earth plate 13 loading plate solid with slurry is connected, and the other end extends to side, waterways 17.
Arranging High Strength Steel Bar mesh sheet 15 in cement-earth plate 13, this High Strength Steel Bar mesh sheet 15 adopts steel strand braiding and becomes, steel strand diameter 4mm, mesh size 100mm �� 100mm.
Above-mentioned cement-earth plate 13, drainage blanket 14, High Strength Steel Bar mesh sheet 15 and geotextile 16 are all in the common backfilled roadbed supported 12 times elongated even layings of pupil portion.
Treat that cement-earth plate 13 solidifies, and after the corresponding construction in step place, layering backfill common backfilled roadbed supported 12 fillers of pupil portion, and compacting, select according to operating mode to dig get conveniently, compacting easily, roadbed filling that intensity height, water stability are good, compaction requirement meets the requirement of current specifications.
After filler is filled to lower embankment bottom surface elevation, adopting light material to fill formation light material and fill layer 6, light material is filled out and is adopted EPS particle light soils, its foam: soil=55:45, dry density is no more than 1.1 �� 103kg/m3, unconfined compression strength is not less than 280kPa; The end face that light material fills layer 6 exceeds former pavement structure 3 bottom surface 300mm.
Different embankment filler boundary place, step excavation plane place all lay geotechnique's reinforcement material 10 and adopt earth grille, and geo-grid is widening laterally elongated laying in embankment filler, and should carry out stretch-draw; Every performance of geo-grid is see table 2, and construction technical requirement should meet the requirement of current specifications.
The concrete parameter list of table 2 geo-grid
Novel road embankment widened structure, main construction course is as follows:
1) prepare before construction: according to construction requirement, process workyard, and carry out the construction line-putting;Dig 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 the regulation of former roadbed side slope for step-like, step upper surface is carried out compacting and arrange 3% interior inclination angle, vertically draw hole downwards from step upper surface at different levels, draw bottom the former roadbed bed course 2 of Kong Shenzhi;
3) high-pressure rotary-spray pile driving construction: carry out high-pressure rotary jet grouting pile 10 and construct, the bottom surface absolute altitude of high-pressure rotary jet grouting pile 10 end face absolute altitudes and former roadbed bed course 2 is put down together;
4) the solid loading plate of slurry is shaped: after high-pressure rotary jet grouting pile 10 reaches former roadbed bed course position, reducing 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 loading plate 9 of slurry;
5) vestibule backfill: solid loading plate 9 mud jacking of slurry is extracted churning pipe, poured into pea gravel concreten in vestibule, and displace original grout emitting after completing, and forms pea gravel concreten and recharges body 5;
6) basement process pile driving construction: excavate the drainage blanket 14 laid near stake position according to design requirements, widened region embankment is carried out cement mixing pile 18 construct, stake top is to drainage blanket 14 times, and stake 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 geotextile 16;
8) cement-earth plate is filled: cement-earth is filled in layering in geotextile 16, and built-in High Strength Steel Bar mesh sheet 15, form reinforced cement earth plate;
9) widening roadbase backfill: according to the filling roadbed material of construction requirement, geo-grid is laid at different embankment filler boundary place, step excavation place, wherein goes up embankment and adopts light filler to fill, forms light material and fill layer 6;
10) successive projects construction: after embankment has filled, carries out roadbed side slope waterproof layer 7, pavement structure engineering 4, unit project construction such as vegetation plantation layer 8 and waterways 17 etc.
Claims (6)
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| CN104631221A (en) * | 2015-02-17 | 2015-05-20 | 铁道第三勘察设计院集团有限公司 | High-speed railway widening subgrade structure |
| CN104846712B (en) | 2015-03-12 | 2017-02-01 | 周太泽 | Hard road construction method by naturally recharging underground water |
| CN105648867B (en) * | 2016-03-02 | 2017-10-31 | 杭州江润科技有限公司 | A kind of construction method of comprehensive ecological roadbed system |
| 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 |
| CN105937196B (en) * | 2016-05-24 | 2017-12-22 | 安徽省交通建设股份有限公司 | A kind of roadbed peg board formula spells wide structure and construction method |
| CN106567303B (en) * | 2016-11-21 | 2018-12-21 | 广东恒普建设工程有限公司 | A kind of road foundation structure |
| CN106988178A (en) * | 2017-04-14 | 2017-07-28 | 华中科技大学 | A kind of subgrade in soft soil zone widened structure and its construction method |
| CN107254817B (en) * | 2017-06-16 | 2019-03-19 | 江苏镇江路桥工程有限公司 | Construction method based on assembled template new and old roadbed light soil splicing widened structure |
| CN108661060B (en) * | 2018-05-22 | 2020-05-08 | 宁夏路桥工程股份有限公司 | Method for reinforcing road expansion construction excavation slope |
| CN109183542A (en) * | 2018-07-26 | 2019-01-11 | 武汉大学 | Run highway soft soil roadbed bumping at bridge-head lower clapboard processing method |
| CN109235169A (en) * | 2018-09-21 | 2019-01-18 | 浙江省交通规划设计研究院有限公司 | A kind of Expressway Widening method at cross over-line bridge |
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| CN110158367A (en) * | 2019-04-12 | 2019-08-23 | 同济大学 | A kind of structure and deformation control method for helping the existing high-speed railway subgrade of width |
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