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 PDF

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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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embankment
roadbed
stake
drainage blanket
widened
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CN201310281073.8A
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CN104278608A (en
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孙玮
何相之
黄小卫
陈伟泰
刘庆怀
董正军
宁永红
武仁玉
宋勤
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杭州华水市政工程有限公司
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Abstract

The present invention relates to the constructional method of a kind of highway embankment widened structure, 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 loading 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 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. The present invention can strengthen the supporting capacity of both sides, widened region subgrade soils and former roadbed side slope intensity, it is to increase the globality of embankment structure, reduces the longitudinal slit brought out due to difference sedimentation etc. new and old roadbed junction and produces, has good technical economic benefit.

Description

The constructional method of a kind of highway embankment widened structure

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 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-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)

1. the constructional method of a highway 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, adopt at former roadbed bed course place pressurization to continue slip casting and form the solid loading 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 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;
The main construction course of described constructional method 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, suspends tube drawing and continues slip casting, 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.
2. the constructional method of highway embankment widened structure according to claim 1, it is characterised in that 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 are between 500 ~ 1000mm; From each step surface or every level step, draw Kong Zhiyuan roadbed base surface downward vertically.
3. the constructional method of highway embankment widened structure according to claim 1, it is characterised in that described drainage blanket divides and paves for twice, adopts level to join uniform coarse sand, rubble or slag of delaying clearly, and upper surface is equipped with geotextile.
4. the constructional method of highway embankment widened structure according to claim 1, it is characterised in that described basement process stake is weak soil compaction stake, adopts cement mixing pile or cast-in place pile, under stake top is positioned at drainage blanket bottom surface.
5. the constructional method of highway embankment widened structure according to claim 1, it is characterised in that described light filler is foam beads mix light-textured soil, air bubble mix light-textured soil or EPS particle light soils.
6. the constructional method of highway embankment widened structure according to claim 1, it is characterized in that different embankment filler boundary place, step extending level face are equipped with geotechnique's reinforcement material, geotechnique's reinforcement material adopts non-woven geotextile, Woven geofabric, plastic civil engineering grid, steel plastic geogrid or earth grille.
CN201310281073.8A 2013-07-05 2013-07-05 The constructional method of a kind of highway embankment widened structure CN104278608B (en)

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